A component-based model integration framework for computer numerical control system design and development is presented.The model integrates modeling,simulation,verification and implementation in a uniform environment...A component-based model integration framework for computer numerical control system design and development is presented.The model integrates modeling,simulation,verification and implementation in a uniform environment.The computer numerical control(CNC) modeling language with well defined syntax and unambiguous semantics is developed.Using the proposed CNC model integration method,a three axis milling system model is developed in the case study.The approach is an attempt to create an infrastructure to support the CNC system design in an efficient way,while at the same time guarantees the function and performance requirements with advanced capability of the system such as modularity,flexibility,reusability,etc.展开更多
Model integration is an important section of the model management research area. The paper puts forward a formalization representation of model, and presents some concepts, such as the compound model re- lation, the c...Model integration is an important section of the model management research area. The paper puts forward a formalization representation of model, and presents some concepts, such as the compound model re- lation, the composite model and so on. Additionally, the existence of model integration is also analyzed in de- tail and several sufficient conditions are proved.展开更多
To look through innovation management in small project-based firms, such as software engineering companies, which are service firms that conduct projects for their clients, capability maturity model integration (CMMI...To look through innovation management in small project-based firms, such as software engineering companies, which are service firms that conduct projects for their clients, capability maturity model integration (CMMI) is introduced. It is a process improvement approach that provides organizations with the essential elements of effective processes. Taking ABC Software Company as an example, the performances before and after the introduction of CMMI in the firm were compared. The results indicated that after two years of application, the productivity increased 92%, and the ability of detecting errors improved 26.45% ; while the rate of faults and the cost of software development dropped 12.45% and 77.55%, respectively. To conclude, small project-based firms benefit a lot if they take CMMI into their process of innovation management, particularly for those R&D firms, since the implementation of CMMI leads them to a promising future with higher efficiency and better effects.展开更多
To address the critical gaps in modeling the failure of gas-bearing coal under realistic multi-source disturbances,this study developed,for the first time,a systematically integrated dual-disturbance damage mechanics ...To address the critical gaps in modeling the failure of gas-bearing coal under realistic multi-source disturbances,this study developed,for the first time,a systematically integrated dual-disturbance damage mechanics model.The model uniquely synthesizes a modified Nishihara-NVPB creep framework with partitioned damage evolution laws to concurrently account for gas adsorption,long-term axial static stress,and the synergistic effects of superimposed cyclic and impact dynamic loads.The core innovation is this strategic damage-partitioning integration,where damage from gas and static load is embedded into the elastic element,and damage from dynamic disturbances is embedded into the viscous and plastic elements,enabling a unified representation of complex multi-factor coupling.This integrated constitutive model was successfully embedded into the GDEM continuum-discontinuum software.A full engineering-scale numerical simulation of a coal and gas outburst was conducted.The results,including the excavation outburst initiation distance,in-situ stress evolution at monitoring points,and outburst coal volume,showed high consistency with benchmark results from a large-scale physical simulation test.This work verifies the model's reliability and applicability at the engineering scale and provides a novel analytical framework and computational tool for investigating the disaster mechanisms of coal and rock dynamic disasters under dual disturbances.展开更多
Existing research has shown that nonlocal piezoelectric differential models often yield inconsistent dynamic responses for nanostructures.To address this issue,the two-phase local-nonlocal integral formulation has bee...Existing research has shown that nonlocal piezoelectric differential models often yield inconsistent dynamic responses for nanostructures.To address this issue,the two-phase local-nonlocal integral formulation has been proposed and has garnered increasing scholarly attention as an effective alternative.This study presents the first implementation of this theoretically consistent and paradox-free framework to investigate the size-dependent dynamic stability and free vibration behavior in piezoelectric Timoshenko nanobeams.The generalized boundary conditions are simulated through elastic constraints incorporating both translational and rotational springs at both beam ends.Departing from conventional approaches,the present formulation simultaneously accounts for size effects in both bending deformation and axial deformation caused by external voltages via the derivation of an equivalent differential representation of the well-posed local-nonlocal integral piezoelectric model.This formulation is rigorously complemented by a complete set of constitutive constraint conditions,ensuring mathematical well-posedness.The generalized differential quadrature method(GDQM)is used to discretize the governing differential equations,enabling numerical determination of dynamic instability regions(DIRs)for various boundary configurations.Following comprehensive validation through comparative analyses,we systematically examine the influence of nonlocal parameters,static force factors,and boundary stiffness characteristics on the DIRs of the beams.Furthermore,this investigation underscores the significance of incorporating nonlocal effects into voltage-induced axial loading,addressing a critical gap in the current understanding of electromechanical coupling at nanoscale dimensions.展开更多
Various physics-based dynamical and data-based statistical models have been developed for uses in predicting sea surface temperature(SST)evolution in relation to the El Niño-Southern Oscillation(ENSO)over the tro...Various physics-based dynamical and data-based statistical models have been developed for uses in predicting sea surface temperature(SST)evolution in relation to the El Niño-Southern Oscillation(ENSO)over the tropical Pacific.At present,clear limitations remain in their ENSO predictions,with predicted SST anomalies(SSTAs)being widely spread across diverse models and considerable inter-model uncertainty.Fortunately,deep learning(DL)-based modeling has recently made promising advances in ENSO prediction tasks;numerous neural networks(NNs)have been constructed for ENSO predictions.However,most NNs themselves are purely data-driven and lack constraints of the necessary physical processes in the coupled system;there are few studies in which DL models are directly integrated with physics-based dynamical models.Previously,such a new type of intermediate coupled models(ICMs)was developed by directly integrating U-Net-derived sea surface wind stress models with an intermediate ocean dynamical model(denoted as ICM-UNet),with demonstrated success in simulating ENSO evolutions in freely coupled runs.It is thus natural to take a step further for prediction applications.In this study,this new ICM-UNet is applied for retrospective ENSO predictions,the first time that such a fusion of DL atmospheric model and dynamical oceanic model with different architectures can be achieved to make ENSO predictions.The overall evaluations indicate that the ICM-UNet yields valid retrospective predictions during the period 1995–2023,confirming that the ICM-UNet is a credible ocean-atmosphere coupled model for ENSO predictions.In case studies during 2020–2023,the ICM-UNet predictions reveal that SSTAs over the equatorial Pacific evolved into a second-year cooling in late 2021 and a warming tendency in 2023,forming a three-year La Niña and an El Niño event thereafter,which is consistent with the reality.The ICM-UNet successful fusion,taking advantage of both the physical constraints due to dynamical oceanic models and nonlinear representations of wind responses due to DL capacity,further underscores the high adaptability of integrating data-driven NNs into the ocean-atmosphere coupled modeling for ENSO-related studies.展开更多
Risk stratification of gastric neuroendocrine tumors(G-NETs)arising in the context of autoimmune gastritis(AIG)remains a significant clinical challenge,as current approaches based on isolated biomarkers or endoscopic ...Risk stratification of gastric neuroendocrine tumors(G-NETs)arising in the context of autoimmune gastritis(AIG)remains a significant clinical challenge,as current approaches based on isolated biomarkers or endoscopic findings fail to fully account for the multifactorial nature of tumor development.Li et al[13]recently published a study in World Journal of Gastroenterology,and this article synthesizes existing evidence on the pathophysiological mechanisms linking AIG to G-NETs,and systematically evaluates the development and validation of integrated clinical-endoscopic models,demonstrating the enhanced performance of machine learning techniques in identifying robust predictors such as age,Helicobacter pylori status,vitamin B12 levels,severity of corpus atrophy,and serum gastrin concentration for accurate risk stratification.The clinical implications of these models are examined across several domains:Enabling risk-adapted endoscopic surveillance schedules,guiding chemopreventive interventions including vitamin B12 supplementation,improving prognostic precision through incorporation of proliferative indices,and enhancing diagnostic consistency across diverse healthcare settings.Although current models show promising discriminative ability(area under the curve:0.830),they are constrained by reliance on single-center cohorts and limited integration of molecular data.Future efforts should prioritize multicenter validation,incorporation of genomic markers,and the creation of multimodal frameworks that integrate endoscopic imaging with serological and genetic profiles to support personalized management of AIGinduced G-NETs.展开更多
Against the backdrop of fostering virtue through education,high school moral education requires deepening home-school collaboration and consolidating the synergy of educational forces.Take multiple high schools as res...Against the backdrop of fostering virtue through education,high school moral education requires deepening home-school collaboration and consolidating the synergy of educational forces.Take multiple high schools as research subjects,this paper combines questionnaire surveys and in-depth interviews to analyze the current status,existing problems,and causes of home-school collaborative moral education.It constructs a scientific and feasible integrated management model for home-school collaborative moral education,clarifies the guiding philosophy and implementation paths,and establishes a four-dimensional support system covering systems,resources,technologies,and evaluation.By verifying the effectiveness through case studies,this paper provides a theoretical basis and practical reference for high school home-school collaborative moral education.展开更多
With the raising complexity of modern civil aircraft,both academy and industry have shown strong interests on MBSE(Model-Based System Engineering).However,following the application of MBSE,the duration of the design p...With the raising complexity of modern civil aircraft,both academy and industry have shown strong interests on MBSE(Model-Based System Engineering).However,following the application of MBSE,the duration of the design phase exceeded expectations.This paper conducted a survey to the relevant participants involved in the design,revealed that a lack of proper process management is a critical issue.The current MBSE methodology does not provide clear guidelines for monitoring,controlling,and managing processes,which are crucial for both efficiency and effectiveness.To address this,the present paper introduced an improved Process Model(PM)within the MBSE framework for civil aircraft design.This improved model incorporates three new Management Blocks(MB):Progress Management Block(PMB),Review Management Block(RMB),and Configuration Management Block(CMB),developed based on the Capability Maturity Model Integration(CMMI).These additions aim to streamline the design process and better align it with engineering practices.The upgraded MBSE method with the improved PM offers a more structured approach to manage complex aircraft design projects,and a case study is conducted to validate its potential to reduce timelines and enhance overall project outcomes.展开更多
The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth...The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth in-terviewing of 15 samples, open-consultation and the analysis of secondhand data. The integration models of tourism labor migrants in the Jiuhua Mountain were formed through four processes including theoretic sampling, cod-ing-analysis, cross-tabulation and contextualization. The result shows that modes of production and life styles decide self-integration orientation of tourism labor migrants in the Jiuhua Mountain. Cultural differences are fundamental dis-similarity between tourism labor migrants and natives. There are three kinds of integration models including rapid, free and gradually advancing integration. The differences among different types of migrants’ integration models are re-markable. Taking the working integration as the abscissa and taking the life integration as the coordinate, an "S" model of integration matrix appears in the gradually advancing integration of intermediate and high administers from the working to the life which should be paid special attention to.展开更多
To address the issue of disturbance compensation deviation in linear active disturbance rejection control(LADRC),a linear active disturbance rejection control method with reference to the integral chain model(LADRC-R)...To address the issue of disturbance compensation deviation in linear active disturbance rejection control(LADRC),a linear active disturbance rejection control method with reference to the integral chain model(LADRC-R)is proposed.By constructing an ideal control reference model,a dynamic correlation between output deviation and uncompensated disturbances is established,and a dual-loop compensation mechanism is designed.Based on theoretical analysis and frequency-domain characteristics of typical first/second-order systems,this method maintains the parameter-tuning advantages of LADRC while reducing disturbance effects by 50%and introducing no phase lag during low-frequency disturbance suppression.Simulations on second-order systems verify its robustness under parameter perturbations,gain mismatch,and complex disturbances,and an optimized design scheme for the deviation compensator is proposed to suppress discontinuous measurement noise interference.Finally,the engineering effectiveness of this method in precision motion control is validated on an electromagnetic suspension platform,providing a new approach to improving the control performance of LADRC in environments with uncertain disturbances.展开更多
This paper extends the one-dimensional(1D)nonlocal strain gradient integral model(NStraGIM)to the two-dimensional(2D)Kirchhoff axisymmetric nanoplates,based on nonlocal strain gradient integral relations formulated al...This paper extends the one-dimensional(1D)nonlocal strain gradient integral model(NStraGIM)to the two-dimensional(2D)Kirchhoff axisymmetric nanoplates,based on nonlocal strain gradient integral relations formulated along both the radial and circumferential directions.By transforming the proposed integral constitutive equations into the equivalent differential forms,complemented by the corresponding constitutive boundary conditions(CBCs),a well-posed mathematical formulation is established for analyzing the axisymmetric bending and buckling of annular/circular functionally graded(FG)sandwich nanoplates.The boundary conditions at the inner edge of a solid nanoplate are derived by L'H?spital's rule.The numerical solution is obtained by the generalized differential quadrature method(GDQM).The accuracy of the proposed model is validated through comparison with the data from the existing literature.A parameter study is conducted to demonstrate the effects of FG sandwich parameters,size parameters,and nonlocal gradient parameters.展开更多
Multiple Sclerosis(MS) is a major cause of neurological disability in adults and has an annual cost of approximately $28 billion in the United States. MS is a very complex disorder as demyelination can happen in a v...Multiple Sclerosis(MS) is a major cause of neurological disability in adults and has an annual cost of approximately $28 billion in the United States. MS is a very complex disorder as demyelination can happen in a variety of locations throughout the brain; therefore, this disease is never the same in two patients making it very hard to predict disease progression. A modeling approach which combines clinical, biological and imaging measures to help treat and fight this disorder is needed. In this paper, I will outline MS as a very heterogeneous disorder, review some potential solutions from the literature, demonstrate the need for a biomarker and will discuss how computational modeling combined with biological, clinical and imaging data can help link disparate observations and decipher complex mechanisms whose solutions are not amenable to simple reductionism.展开更多
As a prominent mode of variability in the tropical stratosphere on the interannual timescale,the Quasi-Biennial Oscillation(QBO)can significantly influence global atmospheric circulation and weather patterns.This stud...As a prominent mode of variability in the tropical stratosphere on the interannual timescale,the Quasi-Biennial Oscillation(QBO)can significantly influence global atmospheric circulation and weather patterns.This study explores the dynamic processes of QBO disruptions using the integrated climate model of the China Meteorological Administration(CMA)by nudging the tropical zonal winds toward observations.A comparative analysis with ERA5 reanalysis data shows that the nudged runs accurately replicate the general characteristics of the QBO,including the alternating QBO wind regimes and QBO disruption events.The evolution of the QBO winds is diagnosed using empirical orthogonal function and root-mean-square difference analyses,and the rarity of the disruption events is confirmed in the CMA model.Different aspects of the QBO disruptions and the relevant dynamics are present in the model.Firstly,the momentum budget analysis highlights the crucial roles of extratropical Rossby waves and non-orographic gravity waves in the transition from westerly to easterly winds during a disruption.Secondly,Kelvin waves and non-orographic gravity waves explain much of the transition from easterly to westerly winds near 40 hPa.Thirdly,the positive tendency from enhanced vertical advection further accelerates westerly momentum development via secondary meridional circulation.These findings underscore the importance of nudging techniques in understanding QBO dynamics,which provides valuable insights for future climate model improvements toward better forecasting QBO-related climate variability.Notably,due to model limitations,no QBO disruptions were simulated in the free-run experiments.展开更多
Background As information technology has advanced and been popularized,open pit mining has rapidly developed toward integration and digitization.The three-dimensional reconstruction technology has been successfully ap...Background As information technology has advanced and been popularized,open pit mining has rapidly developed toward integration and digitization.The three-dimensional reconstruction technology has been successfully applied to geological reconstruction and modeling of surface scenes in open pit mines.However,an integrated modeling method for surface and underground mine sites has not been reported.Methods In this study,we propose an integrated modeling method for open pit mines that fuses a real scene on the surface with an underground geological model.Based on oblique photography,a real-scene model was established on the surface.Based on the surface-stitching method proposed,the upper and lower surfaces and sides of the model were constructed in stages to construct a complete underground three-dimensional geological model,and the aboveground and underground models were registered together to build an integrated open pit mine model.Results The oblique photography method used reconstructed a surface model of an open pit mine using a real scene.The surface-stitching algorithm proposed was compared with the ball-pivoting and Poisson algorithms,and the integrity of the reconstructed model was markedly superior to that of the other two reconstruction methods.In addition,the surface-stitching algorithm was applied to the reconstruction of different formation models and showed good stability and reconstruction efficiency.Finally,the aboveground and underground models were accurately fitted after registration to form an integrated model.Conclusions The proposed method can efficiently establish an integrated open pit model.Based on the integrated model,an open pit auxiliary planning system was designed and realized.It supports the functions of mining planning and output calculation,assists users in mining planning and operation management,and improves production efficiency and management levels.展开更多
Quantification of river flood risks is a prerequisite for floodplain management and development.The lower Yellow River(LYR)is characterized by a complex channel–floodplain system,which is prone to flooding but inhabi...Quantification of river flood risks is a prerequisite for floodplain management and development.The lower Yellow River(LYR)is characterized by a complex channel–floodplain system,which is prone to flooding but inhabits a large population on the floodplains.Many floodplain management modes have been presented,but implementation effects of these management modes have not been evaluated correctly.An integrated model was first proposed to evaluate the flood risks to people’s life and property,covering an improved module of two-dimensional(2D)morphodynamic processes and a module of flood risk evaluation for people,buildings and crops on the floodplains.Two simulation cases were then conducted to validate the model accuracy,including the hyperconcentrated flood event and dike-breach induced flood event occurring in the LYR.Finally,the integrated model was applied to key floodplains in the LYR,and the effects of different floodplain management modes were quantified on the risks to people’s life and property under an extreme flood event.Results indicate that:①Satisfactory accuracy was achieved in the simulation of these two flood events.The maximum sediment concentration was just underestimated by 9%,and the simulated inundation depth agreed well with the field record;②severe inundation was predicted to occur in most domains under the current topography(SchemeⅠ),which would be alleviated after implementing different floodplain management modes,with the area in slight inundation degree accounting for a large proportion under the mode of“construction of protection embankment”(SchemeⅡ)and the area in medium inundation degree occupying a high ratio under the mode of“floodplain partition harnessing”(SchemeⅢ);and③compared with SchemeⅠ,the high-risk area for people’s life and property would reduce by 21%–49%under SchemeⅡ,and by 35%–93%under SchemeⅢ.展开更多
We investigate the integrability of the Rabi model,which is traditionally viewed as not Yang–Baxter-integrable despite its solvability.Building on efforts by Bogoliubov and Kulish(2013 J.Math.Sci.19214–30),Amico et ...We investigate the integrability of the Rabi model,which is traditionally viewed as not Yang–Baxter-integrable despite its solvability.Building on efforts by Bogoliubov and Kulish(2013 J.Math.Sci.19214–30),Amico et al(2007 Nucl.Phys.B 787283–300),and Batchelor and Zhou(2015 Phys.Rev.A 91053808),who explored special limiting cases of the model,we develop a spin–boson interaction Hamiltonian under more general boundary conditions,particularly focusing on open boundary conditions with off-diagonal terms.Our approach maintains the direction of the spin in the z direction and also preserves the boson particle number operator a†a,marking a progression beyond previous efforts that have primarily explored reduced forms of the Rabi model from Yang–Baxter algebra.We also address the presence of‘unwanted’quadratic boson terms a2 and a†2,which share coefficients with the boson particle number operator.Interestingly,these terms vanish when spectral parameter u=±θs,simplifying the model to a limiting case of operator-valued twists,a scenario previously discussed by Batchelor and Zhou(2015 Phys.Rev.A 91053808).展开更多
This study empirically analyzes the application effect of the integration of medical and educational models in cultivating professional abilities in traditional Chinese medicine rehabilitation techniques.The research ...This study empirically analyzes the application effect of the integration of medical and educational models in cultivating professional abilities in traditional Chinese medicine rehabilitation techniques.The research subjects are 100 students from the Traditional Chinese Medicine Rehabilitation Technology major at Y school.Through questionnaire scores,practical training results,and interview data,this study explores the outcomes of this integrated approach.The findings reveal that students in the experimental group significantly outperform those in the control group in terms of practical operation skills,professional responsibility,and communication and collaboration skills.This research confirms the notable role of the medical-educational integration model in enhancing the professional skills and accomplishments of students majoring in traditional Chinese medicine rehabilitation,providing a scientific basis for vocational education reform and the cultivation of rehabilitation technical talents.展开更多
Objective: In this paper, the application effect of medical care integration model in orthopaedic nursing was analyzed. Methods: a total of 88 patients with orthopedic diseases admitted to our hospital from September ...Objective: In this paper, the application effect of medical care integration model in orthopaedic nursing was analyzed. Methods: a total of 88 patients with orthopedic diseases admitted to our hospital from September 2019 to August 2020 were randomly selected, of which 44 patients were selected from the control group (conventional conservative treatment) and the observation group (medical care integration model), and the overall care of the two groups were compared. Results: compared with the control group, the actual hospitalization time, actual abnormal feedback time and reservation waiting time in the observation group were significantly shortened (P<0.05). In terms of satisfaction, the observation group was significantly reduced and significantly better than the control group (P <0.05). Conclusion: the integrated medical care model can reduce the hospitalization and waiting time of orthopedic patients and improve patients' satisfaction with the care model.展开更多
Multi-source errors,as critical obstacles limiting the accuracy retention and machining performance of machine tools,hold fundamental and strategic significance for achieving high-precision,high-efficiency,and high-re...Multi-source errors,as critical obstacles limiting the accuracy retention and machining performance of machine tools,hold fundamental and strategic significance for achieving high-precision,high-efficiency,and high-reliability machining in modern manufacturing systems.However,these errors typically exhibit complex characteristics such as strong coupling,time-variance,and nonlinearity,which challenge traditional methods of error identification,modeling,and compensation in terms of adaptability,real-time capability,and integration.Therefore,it is imperative to establish a systematic and intelligent multi-source error control framework.Firstly,this work systematically reviews typical error sources and their evolution mechanisms,evaluates multi-scale detection technologies including laser interferometry,double ball-bar systems,multi-sensor fusion,and vision-based systems,and constructs an intelligent error identification and evaluation framework.Next,it reviews classical modeling methods such as homogeneous transformation matrices,screw theory,thermal equilibrium models,finite element analysis,and modal analysis,compares physical modeling,data-driven,and hybrid modeling strategies,and develops an integrated multi-source error modeling architecture centered on digital twin technology and artificial intelligence.Furthermore,key technologies,including geometric error mapping and real-time compensation,online thermal error prediction and active temperature control,dynamic error suppression,and adaptive control,are summarized.A multi-level integrated error compensation architecture is proposed by combining physical models,data models,and cyber-physical synchronization.This architecture encompasses core processes such as error traceability and decoupling,dynamic prediction,real-time compensation,and closed-loop optimization,emphasizing engineering implementation mechanisms based on cyber-physical collaboration,multi-physics coupling,and multi-scale fusion,thereby effectively enhancing accuracy stability and control robustness under complex operating conditions.Finally,frontier challenges such as constructing high-fidelity coupled models from heterogeneous multi-source data,edge-cloud collaborative control,and cross-platform interoperability are discussed.The application prospects of multi-source error evaluation are also envisioned,providing theoretical foundations and technical support for the precise management and optimization of the entire lifecycle accuracy of machine tools.展开更多
基金the National Natural Science Foundation of China (Nos. 50575075 and 50875090)
摘要A component-based model integration framework for computer numerical control system design and development is presented.The model integrates modeling,simulation,verification and implementation in a uniform environment.The computer numerical control(CNC) modeling language with well defined syntax and unambiguous semantics is developed.Using the proposed CNC model integration method,a three axis milling system model is developed in the case study.The approach is an attempt to create an infrastructure to support the CNC system design in an efficient way,while at the same time guarantees the function and performance requirements with advanced capability of the system such as modularity,flexibility,reusability,etc.
基金Supported by the National Natural Science Foundationof China (No.60474041).
摘要Model integration is an important section of the model management research area. The paper puts forward a formalization representation of model, and presents some concepts, such as the compound model re- lation, the composite model and so on. Additionally, the existence of model integration is also analyzed in de- tail and several sufficient conditions are proved.
摘要To look through innovation management in small project-based firms, such as software engineering companies, which are service firms that conduct projects for their clients, capability maturity model integration (CMMI) is introduced. It is a process improvement approach that provides organizations with the essential elements of effective processes. Taking ABC Software Company as an example, the performances before and after the introduction of CMMI in the firm were compared. The results indicated that after two years of application, the productivity increased 92%, and the ability of detecting errors improved 26.45% ; while the rate of faults and the cost of software development dropped 12.45% and 77.55%, respectively. To conclude, small project-based firms benefit a lot if they take CMMI into their process of innovation management, particularly for those R&D firms, since the implementation of CMMI leads them to a promising future with higher efficiency and better effects.
基金supported by the National Natural Science Foundation of China(Nos.52174081 and 52204096)Fund of Taishan Scholar Project and Natural Science Foundation of Shandong Province(Nos.ZR2025QC2200Z and ZR2022QE031)Research Initiation Foundation of Shandong University of Aeronautics(No.801003025019).
摘要To address the critical gaps in modeling the failure of gas-bearing coal under realistic multi-source disturbances,this study developed,for the first time,a systematically integrated dual-disturbance damage mechanics model.The model uniquely synthesizes a modified Nishihara-NVPB creep framework with partitioned damage evolution laws to concurrently account for gas adsorption,long-term axial static stress,and the synergistic effects of superimposed cyclic and impact dynamic loads.The core innovation is this strategic damage-partitioning integration,where damage from gas and static load is embedded into the elastic element,and damage from dynamic disturbances is embedded into the viscous and plastic elements,enabling a unified representation of complex multi-factor coupling.This integrated constitutive model was successfully embedded into the GDEM continuum-discontinuum software.A full engineering-scale numerical simulation of a coal and gas outburst was conducted.The results,including the excavation outburst initiation distance,in-situ stress evolution at monitoring points,and outburst coal volume,showed high consistency with benchmark results from a large-scale physical simulation test.This work verifies the model's reliability and applicability at the engineering scale and provides a novel analytical framework and computational tool for investigating the disaster mechanisms of coal and rock dynamic disasters under dual disturbances.
基金National Natural Science Foundation of China(Nos.12502187,52378195,12172169)National Key Research and Development Program of China(No.2023YFF006001)+3 种基金Xi'an Young and Middle-aged Science and Technology Innovation Leading Talent Project(No.25ZORC00008)Natural Science Basic Research Program of Shaanxi(Nos.2025JC-YBQN-018,2025JC-YBQN-028)Scientific Research Program Funded by Education Department of Shaanxi Provincial Government(No.24JK0519)Natural Sciences and Engineering Research Council of Canada via a Discovery Grant(No.NSERC RGPIN-2023-03227)。
摘要Existing research has shown that nonlocal piezoelectric differential models often yield inconsistent dynamic responses for nanostructures.To address this issue,the two-phase local-nonlocal integral formulation has been proposed and has garnered increasing scholarly attention as an effective alternative.This study presents the first implementation of this theoretically consistent and paradox-free framework to investigate the size-dependent dynamic stability and free vibration behavior in piezoelectric Timoshenko nanobeams.The generalized boundary conditions are simulated through elastic constraints incorporating both translational and rotational springs at both beam ends.Departing from conventional approaches,the present formulation simultaneously accounts for size effects in both bending deformation and axial deformation caused by external voltages via the derivation of an equivalent differential representation of the well-posed local-nonlocal integral piezoelectric model.This formulation is rigorously complemented by a complete set of constitutive constraint conditions,ensuring mathematical well-posedness.The generalized differential quadrature method(GDQM)is used to discretize the governing differential equations,enabling numerical determination of dynamic instability regions(DIRs)for various boundary configurations.Following comprehensive validation through comparative analyses,we systematically examine the influence of nonlocal parameters,static force factors,and boundary stiffness characteristics on the DIRs of the beams.Furthermore,this investigation underscores the significance of incorporating nonlocal effects into voltage-induced axial loading,addressing a critical gap in the current understanding of electromechanical coupling at nanoscale dimensions.
基金Supported by the Laoshan Laboratory(No.LSKJ202202402)the National Natural Science Foundation of China(No.42030410)+1 种基金the Startup Foundation for Introducing Talent of NUISTthe Jiangsu Innovation Research Group(No.JSSCTD 202346)。
摘要Various physics-based dynamical and data-based statistical models have been developed for uses in predicting sea surface temperature(SST)evolution in relation to the El Niño-Southern Oscillation(ENSO)over the tropical Pacific.At present,clear limitations remain in their ENSO predictions,with predicted SST anomalies(SSTAs)being widely spread across diverse models and considerable inter-model uncertainty.Fortunately,deep learning(DL)-based modeling has recently made promising advances in ENSO prediction tasks;numerous neural networks(NNs)have been constructed for ENSO predictions.However,most NNs themselves are purely data-driven and lack constraints of the necessary physical processes in the coupled system;there are few studies in which DL models are directly integrated with physics-based dynamical models.Previously,such a new type of intermediate coupled models(ICMs)was developed by directly integrating U-Net-derived sea surface wind stress models with an intermediate ocean dynamical model(denoted as ICM-UNet),with demonstrated success in simulating ENSO evolutions in freely coupled runs.It is thus natural to take a step further for prediction applications.In this study,this new ICM-UNet is applied for retrospective ENSO predictions,the first time that such a fusion of DL atmospheric model and dynamical oceanic model with different architectures can be achieved to make ENSO predictions.The overall evaluations indicate that the ICM-UNet yields valid retrospective predictions during the period 1995–2023,confirming that the ICM-UNet is a credible ocean-atmosphere coupled model for ENSO predictions.In case studies during 2020–2023,the ICM-UNet predictions reveal that SSTAs over the equatorial Pacific evolved into a second-year cooling in late 2021 and a warming tendency in 2023,forming a three-year La Niña and an El Niño event thereafter,which is consistent with the reality.The ICM-UNet successful fusion,taking advantage of both the physical constraints due to dynamical oceanic models and nonlinear representations of wind responses due to DL capacity,further underscores the high adaptability of integrating data-driven NNs into the ocean-atmosphere coupled modeling for ENSO-related studies.
摘要Risk stratification of gastric neuroendocrine tumors(G-NETs)arising in the context of autoimmune gastritis(AIG)remains a significant clinical challenge,as current approaches based on isolated biomarkers or endoscopic findings fail to fully account for the multifactorial nature of tumor development.Li et al[13]recently published a study in World Journal of Gastroenterology,and this article synthesizes existing evidence on the pathophysiological mechanisms linking AIG to G-NETs,and systematically evaluates the development and validation of integrated clinical-endoscopic models,demonstrating the enhanced performance of machine learning techniques in identifying robust predictors such as age,Helicobacter pylori status,vitamin B12 levels,severity of corpus atrophy,and serum gastrin concentration for accurate risk stratification.The clinical implications of these models are examined across several domains:Enabling risk-adapted endoscopic surveillance schedules,guiding chemopreventive interventions including vitamin B12 supplementation,improving prognostic precision through incorporation of proliferative indices,and enhancing diagnostic consistency across diverse healthcare settings.Although current models show promising discriminative ability(area under the curve:0.830),they are constrained by reliance on single-center cohorts and limited integration of molecular data.Future efforts should prioritize multicenter validation,incorporation of genomic markers,and the creation of multimodal frameworks that integrate endoscopic imaging with serological and genetic profiles to support personalized management of AIGinduced G-NETs.
摘要Against the backdrop of fostering virtue through education,high school moral education requires deepening home-school collaboration and consolidating the synergy of educational forces.Take multiple high schools as research subjects,this paper combines questionnaire surveys and in-depth interviews to analyze the current status,existing problems,and causes of home-school collaborative moral education.It constructs a scientific and feasible integrated management model for home-school collaborative moral education,clarifies the guiding philosophy and implementation paths,and establishes a four-dimensional support system covering systems,resources,technologies,and evaluation.By verifying the effectiveness through case studies,this paper provides a theoretical basis and practical reference for high school home-school collaborative moral education.
基金supported by the National Natural Science Foundation of China(No.62073267)。
摘要With the raising complexity of modern civil aircraft,both academy and industry have shown strong interests on MBSE(Model-Based System Engineering).However,following the application of MBSE,the duration of the design phase exceeded expectations.This paper conducted a survey to the relevant participants involved in the design,revealed that a lack of proper process management is a critical issue.The current MBSE methodology does not provide clear guidelines for monitoring,controlling,and managing processes,which are crucial for both efficiency and effectiveness.To address this,the present paper introduced an improved Process Model(PM)within the MBSE framework for civil aircraft design.This improved model incorporates three new Management Blocks(MB):Progress Management Block(PMB),Review Management Block(RMB),and Configuration Management Block(CMB),developed based on the Capability Maturity Model Integration(CMMI).These additions aim to streamline the design process and better align it with engineering practices.The upgraded MBSE method with the improved PM offers a more structured approach to manage complex aircraft design projects,and a case study is conducted to validate its potential to reduce timelines and enhance overall project outcomes.
基金Under the auspices of the Social Science Foundation of China (No. 40771059)Project of Key Research Institute of Humanities and Social Science of Anhui Provincial Education Department (No. 2008sk082rd)
摘要The grounded theory of qualitative methods was applied to researching the social integration of tourism la-bor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth in-terviewing of 15 samples, open-consultation and the analysis of secondhand data. The integration models of tourism labor migrants in the Jiuhua Mountain were formed through four processes including theoretic sampling, cod-ing-analysis, cross-tabulation and contextualization. The result shows that modes of production and life styles decide self-integration orientation of tourism labor migrants in the Jiuhua Mountain. Cultural differences are fundamental dis-similarity between tourism labor migrants and natives. There are three kinds of integration models including rapid, free and gradually advancing integration. The differences among different types of migrants’ integration models are re-markable. Taking the working integration as the abscissa and taking the life integration as the coordinate, an "S" model of integration matrix appears in the gradually advancing integration of intermediate and high administers from the working to the life which should be paid special attention to.
基金supported by the National Natural Science Foundation of China(Nos.62063009,52262050)the National Key Research and Development Program during the 14th 5-Year Plan(No.2023YFB4302100)the Major Science and Technology Research and Development Special Project in Jiangxi Province(No.20232ACE01011).
摘要To address the issue of disturbance compensation deviation in linear active disturbance rejection control(LADRC),a linear active disturbance rejection control method with reference to the integral chain model(LADRC-R)is proposed.By constructing an ideal control reference model,a dynamic correlation between output deviation and uncompensated disturbances is established,and a dual-loop compensation mechanism is designed.Based on theoretical analysis and frequency-domain characteristics of typical first/second-order systems,this method maintains the parameter-tuning advantages of LADRC while reducing disturbance effects by 50%and introducing no phase lag during low-frequency disturbance suppression.Simulations on second-order systems verify its robustness under parameter perturbations,gain mismatch,and complex disturbances,and an optimized design scheme for the deviation compensator is proposed to suppress discontinuous measurement noise interference.Finally,the engineering effectiveness of this method in precision motion control is validated on an electromagnetic suspension platform,providing a new approach to improving the control performance of LADRC in environments with uncertain disturbances.
基金Project supported by the National Natural Science Foundation of China(No.12172169)the Priority Academic Program Development of Jiangsu Higher Education Institutions。
摘要This paper extends the one-dimensional(1D)nonlocal strain gradient integral model(NStraGIM)to the two-dimensional(2D)Kirchhoff axisymmetric nanoplates,based on nonlocal strain gradient integral relations formulated along both the radial and circumferential directions.By transforming the proposed integral constitutive equations into the equivalent differential forms,complemented by the corresponding constitutive boundary conditions(CBCs),a well-posed mathematical formulation is established for analyzing the axisymmetric bending and buckling of annular/circular functionally graded(FG)sandwich nanoplates.The boundary conditions at the inner edge of a solid nanoplate are derived by L'H?spital's rule.The numerical solution is obtained by the generalized differential quadrature method(GDQM).The accuracy of the proposed model is validated through comparison with the data from the existing literature.A parameter study is conducted to demonstrate the effects of FG sandwich parameters,size parameters,and nonlocal gradient parameters.
摘要Multiple Sclerosis(MS) is a major cause of neurological disability in adults and has an annual cost of approximately $28 billion in the United States. MS is a very complex disorder as demyelination can happen in a variety of locations throughout the brain; therefore, this disease is never the same in two patients making it very hard to predict disease progression. A modeling approach which combines clinical, biological and imaging measures to help treat and fight this disorder is needed. In this paper, I will outline MS as a very heterogeneous disorder, review some potential solutions from the literature, demonstrate the need for a biomarker and will discuss how computational modeling combined with biological, clinical and imaging data can help link disparate observations and decipher complex mechanisms whose solutions are not amenable to simple reductionism.
基金funded by the National Natural Science Foundation of China(Grant No.42275056).
摘要As a prominent mode of variability in the tropical stratosphere on the interannual timescale,the Quasi-Biennial Oscillation(QBO)can significantly influence global atmospheric circulation and weather patterns.This study explores the dynamic processes of QBO disruptions using the integrated climate model of the China Meteorological Administration(CMA)by nudging the tropical zonal winds toward observations.A comparative analysis with ERA5 reanalysis data shows that the nudged runs accurately replicate the general characteristics of the QBO,including the alternating QBO wind regimes and QBO disruption events.The evolution of the QBO winds is diagnosed using empirical orthogonal function and root-mean-square difference analyses,and the rarity of the disruption events is confirmed in the CMA model.Different aspects of the QBO disruptions and the relevant dynamics are present in the model.Firstly,the momentum budget analysis highlights the crucial roles of extratropical Rossby waves and non-orographic gravity waves in the transition from westerly to easterly winds during a disruption.Secondly,Kelvin waves and non-orographic gravity waves explain much of the transition from easterly to westerly winds near 40 hPa.Thirdly,the positive tendency from enhanced vertical advection further accelerates westerly momentum development via secondary meridional circulation.These findings underscore the importance of nudging techniques in understanding QBO dynamics,which provides valuable insights for future climate model improvements toward better forecasting QBO-related climate variability.Notably,due to model limitations,no QBO disruptions were simulated in the free-run experiments.
基金Supported by Liaoning Province Science and Technology Research Project(2021JH1/10400011)National Natural Science Foundation of China(61971118).
摘要Background As information technology has advanced and been popularized,open pit mining has rapidly developed toward integration and digitization.The three-dimensional reconstruction technology has been successfully applied to geological reconstruction and modeling of surface scenes in open pit mines.However,an integrated modeling method for surface and underground mine sites has not been reported.Methods In this study,we propose an integrated modeling method for open pit mines that fuses a real scene on the surface with an underground geological model.Based on oblique photography,a real-scene model was established on the surface.Based on the surface-stitching method proposed,the upper and lower surfaces and sides of the model were constructed in stages to construct a complete underground three-dimensional geological model,and the aboveground and underground models were registered together to build an integrated open pit mine model.Results The oblique photography method used reconstructed a surface model of an open pit mine using a real scene.The surface-stitching algorithm proposed was compared with the ball-pivoting and Poisson algorithms,and the integrity of the reconstructed model was markedly superior to that of the other two reconstruction methods.In addition,the surface-stitching algorithm was applied to the reconstruction of different formation models and showed good stability and reconstruction efficiency.Finally,the aboveground and underground models were accurately fitted after registration to form an integrated model.Conclusions The proposed method can efficiently establish an integrated open pit model.Based on the integrated model,an open pit auxiliary planning system was designed and realized.It supports the functions of mining planning and output calculation,assists users in mining planning and operation management,and improves production efficiency and management levels.
基金supported by the National Natural Science Foundation of China(U2243238)the Program of the National Key Research and Development Plan(2023YFC3209304).
摘要Quantification of river flood risks is a prerequisite for floodplain management and development.The lower Yellow River(LYR)is characterized by a complex channel–floodplain system,which is prone to flooding but inhabits a large population on the floodplains.Many floodplain management modes have been presented,but implementation effects of these management modes have not been evaluated correctly.An integrated model was first proposed to evaluate the flood risks to people’s life and property,covering an improved module of two-dimensional(2D)morphodynamic processes and a module of flood risk evaluation for people,buildings and crops on the floodplains.Two simulation cases were then conducted to validate the model accuracy,including the hyperconcentrated flood event and dike-breach induced flood event occurring in the LYR.Finally,the integrated model was applied to key floodplains in the LYR,and the effects of different floodplain management modes were quantified on the risks to people’s life and property under an extreme flood event.Results indicate that:①Satisfactory accuracy was achieved in the simulation of these two flood events.The maximum sediment concentration was just underestimated by 9%,and the simulated inundation depth agreed well with the field record;②severe inundation was predicted to occur in most domains under the current topography(SchemeⅠ),which would be alleviated after implementing different floodplain management modes,with the area in slight inundation degree accounting for a large proportion under the mode of“construction of protection embankment”(SchemeⅡ)and the area in medium inundation degree occupying a high ratio under the mode of“floodplain partition harnessing”(SchemeⅢ);and③compared with SchemeⅠ,the high-risk area for people’s life and property would reduce by 21%–49%under SchemeⅡ,and by 35%–93%under SchemeⅢ.
基金supported by the National Natural Science Foundation of China(Grant Nos.12275214,12247103,12047502)the Natural Science Basic Research Program of Shaanxi Province Grant Nos.2021JCW-19 and 2019JQ-107Shaanxi Key Laboratory for Theoretical Physics Frontiers in China.
摘要We investigate the integrability of the Rabi model,which is traditionally viewed as not Yang–Baxter-integrable despite its solvability.Building on efforts by Bogoliubov and Kulish(2013 J.Math.Sci.19214–30),Amico et al(2007 Nucl.Phys.B 787283–300),and Batchelor and Zhou(2015 Phys.Rev.A 91053808),who explored special limiting cases of the model,we develop a spin–boson interaction Hamiltonian under more general boundary conditions,particularly focusing on open boundary conditions with off-diagonal terms.Our approach maintains the direction of the spin in the z direction and also preserves the boson particle number operator a†a,marking a progression beyond previous efforts that have primarily explored reduced forms of the Rabi model from Yang–Baxter algebra.We also address the presence of‘unwanted’quadratic boson terms a2 and a†2,which share coefficients with the boson particle number operator.Interestingly,these terms vanish when spectral parameter u=±θs,simplifying the model to a limiting case of operator-valued twists,a scenario previously discussed by Batchelor and Zhou(2015 Phys.Rev.A 91053808).
基金Henan Province Higher Education Teaching Reform Research and Practice Project“Industry Guidance,Integration of Medical Education,and Professional Reality:Innovation and Practice of Medical Technology(1+2)Education Model”(2024SJGLX0725)Henan Province Medical Education Research Project“Research on the Innovation and Practice of Talent Training Model for Rehabilitation Therapy Technology Majors Based on Collaborative Education between Medicine and Education”(WJLX2023208)Zhengzhou Local College Teaching Reform Research and Practice Project“Research and Practice on the Talent Training Model of Rehabilitation Therapy Technology Based on the Integration of Industry and Education”(ZZJG-A1033)。
摘要This study empirically analyzes the application effect of the integration of medical and educational models in cultivating professional abilities in traditional Chinese medicine rehabilitation techniques.The research subjects are 100 students from the Traditional Chinese Medicine Rehabilitation Technology major at Y school.Through questionnaire scores,practical training results,and interview data,this study explores the outcomes of this integrated approach.The findings reveal that students in the experimental group significantly outperform those in the control group in terms of practical operation skills,professional responsibility,and communication and collaboration skills.This research confirms the notable role of the medical-educational integration model in enhancing the professional skills and accomplishments of students majoring in traditional Chinese medicine rehabilitation,providing a scientific basis for vocational education reform and the cultivation of rehabilitation technical talents.
摘要Objective: In this paper, the application effect of medical care integration model in orthopaedic nursing was analyzed. Methods: a total of 88 patients with orthopedic diseases admitted to our hospital from September 2019 to August 2020 were randomly selected, of which 44 patients were selected from the control group (conventional conservative treatment) and the observation group (medical care integration model), and the overall care of the two groups were compared. Results: compared with the control group, the actual hospitalization time, actual abnormal feedback time and reservation waiting time in the observation group were significantly shortened (P<0.05). In terms of satisfaction, the observation group was significantly reduced and significantly better than the control group (P <0.05). Conclusion: the integrated medical care model can reduce the hospitalization and waiting time of orthopedic patients and improve patients' satisfaction with the care model.
基金financially supported by National Natural Science Foundation of China(Grant Nos.52375447,52305477 and 52105457)the Shandong Provincial Natural Science Foundation of China(Grant Nos.ZR2023QE057,ZR2024QE100 and ZR2024ME255)+2 种基金the Shandong Provincial Science and Technology SMEs Innovation Capacity Improvement Project(Grant No.2024TSGC0239)the Special Fund of Taishan Scholars Project,the Shandong Province Youth Science and Technology Talent Support Project(Grant No.SDAST2024QTA043)the Open Funding of Key Lab of Industrial Fluid Energy Conservation and Pollution Control,Ministry of Education(Grant Nos.CK-2024-0031,CK-2024-0035 and CK-2024-0036).
摘要Multi-source errors,as critical obstacles limiting the accuracy retention and machining performance of machine tools,hold fundamental and strategic significance for achieving high-precision,high-efficiency,and high-reliability machining in modern manufacturing systems.However,these errors typically exhibit complex characteristics such as strong coupling,time-variance,and nonlinearity,which challenge traditional methods of error identification,modeling,and compensation in terms of adaptability,real-time capability,and integration.Therefore,it is imperative to establish a systematic and intelligent multi-source error control framework.Firstly,this work systematically reviews typical error sources and their evolution mechanisms,evaluates multi-scale detection technologies including laser interferometry,double ball-bar systems,multi-sensor fusion,and vision-based systems,and constructs an intelligent error identification and evaluation framework.Next,it reviews classical modeling methods such as homogeneous transformation matrices,screw theory,thermal equilibrium models,finite element analysis,and modal analysis,compares physical modeling,data-driven,and hybrid modeling strategies,and develops an integrated multi-source error modeling architecture centered on digital twin technology and artificial intelligence.Furthermore,key technologies,including geometric error mapping and real-time compensation,online thermal error prediction and active temperature control,dynamic error suppression,and adaptive control,are summarized.A multi-level integrated error compensation architecture is proposed by combining physical models,data models,and cyber-physical synchronization.This architecture encompasses core processes such as error traceability and decoupling,dynamic prediction,real-time compensation,and closed-loop optimization,emphasizing engineering implementation mechanisms based on cyber-physical collaboration,multi-physics coupling,and multi-scale fusion,thereby effectively enhancing accuracy stability and control robustness under complex operating conditions.Finally,frontier challenges such as constructing high-fidelity coupled models from heterogeneous multi-source data,edge-cloud collaborative control,and cross-platform interoperability are discussed.The application prospects of multi-source error evaluation are also envisioned,providing theoretical foundations and technical support for the precise management and optimization of the entire lifecycle accuracy of machine tools.