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Construction of a Virtual Twin Testing Framework for Safety of the Intended Functionality in Intelligent Connected Vehicles 认领 引用 被引量：1
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作者 Quanyou Fu Daxu Sun 《Journal of Electronic Research and Application》 2025年第5期12-17,共6页
This study aims to construct a virtual twin testing framework for the safety of the intended functionality of intelligent connected vehicles to address the safety requirements of intelligent driving and transportation... This study aims to construct a virtual twin testing framework for the safety of the intended functionality of intelligent connected vehicles to address the safety requirements of intelligent driving and transportation systems.The research methods include the construction of a theoretical model of safety for intelligent connected vehicles based on the concept of virtual twins,the correlation study between key concepts and functional safety,and the application research of virtual twin technology in the safety testing of intelligent connected vehicles.The results reveal that the virtual twin testing framework can effectively enhance the functional safety of intelligent connected vehicles,reduce development costs,and shorten the product launch cycle.The conclusion suggests that this framework provides strong support for the healthy development of the intelligent connected vehicle industry and has a positive impact on the safety and efficiency of intelligent transportation systems. 展开更多
关键词 Intelligent connected vehicles Safety of the intended functionality Virtual twin Testing framework Safety theory model
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Nondestructive Testing and Characterization of Residual Stress Field Using an Ultrasonic Method 认领 引用 被引量：44
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作者 SONG Wentao XU Chunguang +1 位作者 PAN Qinxue SONG Jianfeng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第2期365-371,共7页
To address the difficulty in testing and calibrating the stress gradient in the depth direction of mechanical components, a new technology of nondestructive testing and characterization of the residual stress gradient... To address the difficulty in testing and calibrating the stress gradient in the depth direction of mechanical components, a new technology of nondestructive testing and characterization of the residual stress gradient field by ultrasonic method is proposed based on acoustoelasticity theory. By carrying out theoretical analysis, the sensitivity coefficients of different types of ultrasonic are obtained by taking the low carbon steel（12%C） as a research object. By fixing the interval distance between sending and receiving transducers, the mathematical expressions of the change of stress and the variation of time are established. To design one sending-one receiving and oblique incidence ultrasonic detection probes, according to Snell law, the critically refracted longitudinal wave（LCR wave） is excited at a certain depth of the fixed distance of the tested components. Then, the relationship between the depth of LCR wave detection and the center frequency of the probe in Q235 steel is obtained through experimental study. To detect the stress gradient in the depth direction, a stress gradient LCR wave detection model is established, through which the stress gradient formula is derived by the relationship between center frequency and detecting depth. A C-shaped stress specimen of Q235 steel is designed to conduct stress loading tests, and the stress is measured with the five group probes at different center frequencies. The accuracy of ultrasonic testing is verified by X-ray stress analyzer. The stress value of each specific depth is calculated using the stress gradient formula. Accordingly, the ultrasonic characterization of residual stress field is realized. Characterization results show that the stress gradient distribution is consistent with the simulation in ANSYS. The new technology can be widely applied in the detection of the residual stress gradient field caused by mechanical processing, such as welding and shot peening. 展开更多
关键词 ultrasonic nondestructive testing acoustoelasticity theory residual stress field stress gradient ultrasonic characterization
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Bayesian optimal design of step stress accelerated degradation testing 认领 引用 被引量：3
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作者 Xiaoyang Li Mohammad Rezvanizaniani +2 位作者 Zhengzheng Ge Mohamed Abuali Jay Lee 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2015年第3期502-513,共12页
This study presents a Bayesian methodology for de- signing step stress accelerated degradation testing （SSADT） and its application to batteries. First, the simulation-based Bayesian de- sign framework for SSADT is p... This study presents a Bayesian methodology for de- signing step stress accelerated degradation testing （SSADT） and its application to batteries. First, the simulation-based Bayesian de- sign framework for SSADT is presented. Then, by considering his- torical data, specific optimal objectives oriented Kullback-Leibler （KL） divergence is established. A numerical example is discussed to illustrate the design approach. It is assumed that the degrada- tion model （or process） follows a drift Brownian motion; the accele- ration model follows Arrhenius equation; and the corresponding parameters follow normal and Gamma prior distributions. Using the Markov Chain Monte Carlo （MCMC） method and WinBUGS software, the comparison shows that KL divergence is better than quadratic loss for optimal criteria. Further, the effect of simulation outiiers on the optimization plan is analyzed and the preferred sur- face fitting algorithm is chosen. At the end of the paper, a NASA lithium-ion battery dataset is used as historical information and the KL divergence oriented Bayesian design is compared with maxi- mum likelihood theory oriented locally optimal design. The results show that the proposed method can provide a much better testing plan for this engineering application. 展开更多
关键词 accelerated testing Bayesian theory KL divergence,degradation optimal design battery.
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Testing Photons Coupled to Weyl Tensor with Gravitational Time Advancement 认领 引用
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作者 Gang Li Xue-Mei Deng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第12期721-727,共7页
Classical Solar System tests of photons coupled to Weyl tensor with two polarizations were studied in a recent work. A coupling strength parameter α in this model was firstly obtained as |α| 4 × 1011 m^2 by ... Classical Solar System tests of photons coupled to Weyl tensor with two polarizations were studied in a recent work. A coupling strength parameter α in this model was firstly obtained as |α| 4 × 1011 m^2 by using available datasets in the Solar System. In this paper, a new test called by gravitational time advancement is proposed and investigated to test such the coupling. This new test, which is quite different from Shapiro time delay, depends strongly on round-trip proper time span(not coordinate time one) of flight of radio pulses between an observer on the Earth and a distant spacecraft. For ranging a spacecraft getting far away from the Sun, two special cases(the superior/inferior conjunctions) are used to analyse the observability in the advancement contributed by the Weyl coupling. We found that the situation of the inferior conjunction is more suitable for detecting the advancement caused by such the Weyl coupling.In either case, two kinds of polarizations make the advancement in the model smaller or larger than the one of general relativity. Although the observability in the advancement could be out of the reach of already existing technology, the implement of planetary laser ranging and optical clocks might provide us more insights on such the Weyl coupling in the near future. 展开更多
关键词 gravitation experimental tests of gravitational theories light propagation astrometry
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MSMAM:Testing Resources Allocation,Obtaining Non-Functional Indexes Based on Functional Testing Results,and Evaluating Security 认领 引用
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作者 CAO Hui ZHANG Huanguo YAN Fei 《Wuhan University Journal of Natural Sciences》 CAS 2012年第6期504-510,共7页
Security testing is a key technology for software security.The testing results can reflect the relationship between software testing and software security,and they can help program designers for evaluating and improvi... Security testing is a key technology for software security.The testing results can reflect the relationship between software testing and software security,and they can help program designers for evaluating and improving software security.However,it is difficult to describe by mathematics the relationship between the results of software functional testing and software nonfunctional security indexes.In this paper,we propose a mathematics model(MSMAM)based on principal component analysis and multiattribute utility theory.This model can get nonfunctional security indexes by analyzing quantized results of functional tests.It can also evaluate software security and guide the effective allocation of testing resources in the process of software testing.The feasibility and effectiveness of MSMAM is verified by experiments. 展开更多
关键词 software testing software security principal component analysis multi-attribute theory security evaluation
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Load Reduction Test Method of Similarity Theory and BP Neural Networks of Large Cranes 认领 引用 被引量：5
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作者 YANG Ruigang DUAN Zhibin +2 位作者 LU Yi WANG Lei XU Gening 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第1期145-151,共7页
Static load tests are an important means of supervising and detecting a crane＇s lift capacity. Due to space restrictions, however, there are difficulties and potential danger when testing large bridge cranes. To solv... Static load tests are an important means of supervising and detecting a crane＇s lift capacity. Due to space restrictions, however, there are difficulties and potential danger when testing large bridge cranes. To solve the loading problems of large-tonnage cranes during testing, an equivalency test is proposed based on the similarity theory and BP neural networks. The maximum stress and displacement of a large bridge crane is tested in small loads, combined with the training neural network of a similar structure crane through stress and displacement data which is collected by a physics simulation progressively loaded to a static load test load within the material scope of work. The maximum stress and displacement of a crane under a static load test load can be predicted through the relationship of stress, displacement, and load. By measuring the stress and displacement of small tonnage weights, the stress and displacement of large loads can be predicted, such as the maximum load capacity, which is 1.25 times the rated capacity. Experimental study shows that the load reduction test method can reflect the lift capacity of large bridge cranes. The load shedding predictive analysis for Sanxia 1200 t bridge crane test data indicates that when the load is 1.25 times the rated lifting capacity, the predicted displacement and actual displacement error is zero. The method solves the problem that lifting capacities are difficult to obtain and testing accidents are easily possible when 1.25 times related weight loads are tested for large tonnage cranes. 展开更多
关键词 similarity theory BP neural network large bridge crane load reduction equivalent test method
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Control technology of surrounding rock stability based on compensation theory in gob-side entry retaining with composite hard roof 认领 引用
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作者 MING Can HE Manchao +2 位作者 WANG Jiong LIU Jianning COLI Massimo 《Journal of Mountain Science》 SCIE CSCD 2025年第3期1029-1047,共19页
The 110-mining method,a rising and revolutionary non-pillar longwall mining method,can obviously expand coal extraction ratio and minimize roadway incidents.However,in case of composite hard roof,problems such as diff... The 110-mining method,a rising and revolutionary non-pillar longwall mining method,can obviously expand coal extraction ratio and minimize roadway incidents.However,in case of composite hard roof,problems such as difficulty in commanding the entry steadiness and insufficient fragmentation and bulking of the goaf gangue are prevalent.In this study,a 110-mining method for roadway surrounding rock stability control technology based on a compensation mechanism was proposed.First,the composite hard roof cutting short cantilever beam(SCB)model was built and the compensation mechanism including stress and space dual compensation was studied.Subsequently,the controllable elements influencing the roadway steadiness were confirmed to consequently put forward a control technology based on stress compensation for entry support and space compensation for the fragmentation and bulking of goaf gangue.The control technology was finally verified through onsite engineering experiments in terms of composite hard roof.The adoption of the 110-mining method with compensation control technology indicated good support effect on the roadway.The initial and residual expansion coefficients of the goaf gangue increased by 0.6 and 0.6,respectively,and the maximum and average working resistances of the working face support decreased by 10.9%and 13.8%,respectively.Consequently,the deformations of reserved entry decreased,and entry steadiness was enhanced.The presented technique and effects got probably have practical values for non-pillar mining functions in comparable field. 展开更多
关键词 Retained roadway Short cantilever beam Compensation theory Roadway stability control Pressure relief Industrial test
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Equation of Motion of a Mass Point in Gravitational Field and Classical Tests of Gauge Theory of Gravity 认领 引用 被引量：1
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作者 WU Ning ZHANG Da-Hua 《Communications in Theoretical Physics》 SCIE CAS 2007年第3期503-511,共9页
A systematic method is developed to studY the classical motion of a mass point in gravitational gauge field. First, by using Mathematica, a spherical symmetric solution of the field equation of gravitational gauge fie... A systematic method is developed to studY the classical motion of a mass point in gravitational gauge field. First, by using Mathematica, a spherical symmetric solution of the field equation of gravitational gauge field is obtained, which is just the traditional Schwarzschild solution. Combining the principle of gauge covariance and Newton＇s second law of motion, the equation of motion of a mass point in gravitational field is deduced. Based on the spherical symmetric solution of the field equation and the equation of motion of a mass point in gravitational field, we can discuss classical tests of gauge theory of gravity, including the deflection of light by the sun, the precession of the perihelia of the orbits of the inner planets and the time delay of radar echoes passing the sun. It is found that the theoretical predictions of these classical tests given by gauge theory of gravity are completely the same as those given by general relativity. 展开更多
关键词 classical tests of gauge theory of gravity gauge theory of gravity classical solution of field equation Newton＇s second law of motion
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Spin-Spin Interactions in Gauge Theory of Gravity, Violation of Weak Equivalence Principle and New Classical Test of General Relativity 认领 引用 被引量：3
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作者 WU Ning 《Communications in Theoretical Physics》 SCIE CAS 2008年第6期1533-1540,共8页
For a long time, it has been generally believed that spin-spin interactions can only exist in a theory where Lorentz symmetry is gauged, and a theory with spin-spin interactions is not perturbatively renormalizable. B... For a long time, it has been generally believed that spin-spin interactions can only exist in a theory where Lorentz symmetry is gauged, and a theory with spin-spin interactions is not perturbatively renormalizable. But this is not true. By studying the motion of a spinning particle in gravitational field, it is found that there exist spin-spin interactions in gauge theory of gravity. Its mechanism is that a spinning particle will generate gravitomagnetic field in space-time, and this gravitomagnetic field will interact with the spin of another particle, which will cause spin-spin interactions. So, spin-spin interactions are transmitted by gravitational field. The form of spin-spin interactions in post Newtonian approximations is deduced. This result can also be deduced from the Papapetrou equation. This kind of interaction will not affect the renormalizability of the theory. The spin-spin interactions will violate the weak equivalence principle, and the violation effects are detectable. An experiment is proposed to detect the effects of the violation of the weak equivalence principle. 展开更多
关键词 spin-spin interactions weak equivalence principle equation of motion of a spinning particle experimental test of gravity theory post-Newtonian approximation
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Reducing Item Exposure in Computerized Adaptive Testing Systems Using Automatic Item Generation 认领 引用 被引量：1
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作者 Harutyun Terteryan 《Computer Technology and Application》 2014年第1期21-24,共4页
This paper studies the technics of reducing item exposure by utilizing automatic item generation methods. Known test item calibration method uses item parameter estimation with the statistical data, collected during e... This paper studies the technics of reducing item exposure by utilizing automatic item generation methods. Known test item calibration method uses item parameter estimation with the statistical data, collected during examinees prior testing. Disadvantage of the mentioned item calibration method is the item exposure; when test items become familiar to the examinees. To reduce the item exposure, automatic item generation method is used, where item models are being constructed based on already calibrated test items without losing already estimated item parameters. A technic of item model extraction method from the already calibrated and therefore exposed test items described, which can be used by the test item development specialists to integrate automatic item generation principles with the existing testing applications. 展开更多
关键词 Item exposure calibration IRT （item response theory） adaptive testing automatic item generation item model.
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Understanding Health Worker Perspectives on Risk Screening for HIV Testing—A Qualitative Study from Zimbabwe 认领 引用
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作者 Hamufare D. Mugauri Joconiah Chirenda +4 位作者 Kudakwashe Takarinda Owen Mugurungi Ishmael Chikondowa Patrick Mantiziba Mufuta Tshimanga 《Open Journal of Preventive Medicine》 2022年第10期199-212,共14页
Background: Zimbabwe recorded a 55% increase in HIV testing from 2011 to 2018 but with decreasing HIV-testing yields from 20% to 6% respectively as we aim to identify the narrowing gap of undiagnosed people living wit... Background: Zimbabwe recorded a 55% increase in HIV testing from 2011 to 2018 but with decreasing HIV-testing yields from 20% to 6% respectively as we aim to identify the narrowing gap of undiagnosed people living with HIV. As such adoption of screening tools during targeted HIV testing services improves efficiency by identifying individuals who are likely to test positive. Effective utilization of screening tools requires an understanding of health care worker perception and willingness to use the tools. Methods: We conducted a qualitative study among healthcare workers at 8 selected primary healthcare facilities in Zimbabwe. Interviewer-guided, in-depth interviews were conducted with healthcare workers and their immediate supervisors. Thematic analysis was performed following a framework built around the grounded theory model to describe perspectives that influence the utilization of HIV screening tools and suggestions for improved eligibility screening. Results: Behavioural factors facilitating the utilisation of the screening tool included motivation to adhere to standard practice, awareness of screening in targeting testing, and its ability to manage workload through screening out ineligible clients. This was evident across service delivery levels. Barriers included limited healthcare capacity, confidentiality space, multiple screening tools and opaque screening in/out criteria and the potential of clients not responding to screening questions truthfully. Conclusions: Across geographical and service delivery levels, placing screening tools at HIV testing entry points, healthcare worker knowledge on screening in/out criteria emerged as enablers for correct and consistent utilization. Further, standardizing the tools and adopting a decision aid algorithm would improve the accurate utilisation of screening tools. 展开更多
关键词 Screening Tool Qualitative HIV Testing Services Health Worker Perspectives Grounded Theory Framework
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Designing of A Computerized Cognitive Adaptive Testing Model 认领 引用
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作者 He Lianzhen 《现代外语》 CSSCI 北大核心 1999年第2期169-171,共3页
Therecouldbenoscienceasweknowitwithoutmeasurement.Testing,includingallformsoflanguagetestingandpsychometricsitself,isoneformofmeasurement.Alanguagetestmaybedefinedasaprocedureforelicitinglanguageperformanceandaprocedu... Therecouldbenoscienceasweknowitwithoutmeasurement.Testing,includingallformsoflanguagetestingandpsychometricsitself,isoneformofmeasurement.Alanguagetestmaybedefinedasaprocedureforelicitinglanguageperformanceandaprocedureforassessingthatperformance.How... 展开更多
关键词 Item Response Theory (IRT) Computerized Adaptive Testing (CAT Cognitive Psychology (CP) Computerized Cognitive Adaptive Testing(CCAT)
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Translating COVID Tests Terms From Chinese Into English in the Light of Functional Equivalence Theory 认领 引用
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作者 ZHANG Zhengqing JIA Xiaoqing 《Psychology Research》 2022年第9期712-715,共4页
Communication of the various testing methods of COVID-19 is vital for English speakers within China and with the outside world.This research is set to find out the appropriate translation of the Chinese phrases referr... Communication of the various testing methods of COVID-19 is vital for English speakers within China and with the outside world.This research is set to find out the appropriate translation of the Chinese phrases referring to COVID-19 tests in English,in light of functional equivalence theory,which is expected to help correct mistakes and facilitate understanding between people speaking the two languages. 展开更多
关键词 term translation COVID-19 tests functional equivalence theory
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On Testing Equality of K Multiple Correlation Matrices 认领 引用
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作者 A.K.Gupta D.G.Kabe 《Northeastern Mathematical Journal》 2000年第4期405-410,共6页
Coutsourides derived an ad hoc nuisance paratmeter removal test for testing equality of two multiple correlation matrices of two independent p variate normal populations under the assumption that a sample of size n is... Coutsourides derived an ad hoc nuisance paratmeter removal test for testing equality of two multiple correlation matrices of two independent p variate normal populations under the assumption that a sample of size n is available from each population. This paper presents a likelihood ratio test criterion for testing equality of K multiple correlation matrices and extends the results to the testing of equality of K partial correlation matrices. 展开更多
关键词 normal population multiple correlation matrix partial correlations matrix distribution theory test of hypothesis likelihood ratio test
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Using the unbiased grey Markov chain optimization model to forecast passenger flows through existing urban rail transit stations 认领 引用
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作者 Fuquan Pan Wenzheng Li +3 位作者 Lixia Zhang Xiaoxia Yang Hailiang Tang Yongkai Xia 《Digital Transportation and Safety》 2026年第1期22-31,共10页
To accurately forecast the passenger flows of existing stations in urban rail transit and provide a scientific basis for subway operation management departments,a passenger flow prediction model optimized by an unbias... To accurately forecast the passenger flows of existing stations in urban rail transit and provide a scientific basis for subway operation management departments,a passenger flow prediction model optimized by an unbiased grey Markov chain was constructed.Using 18 months of average daily passenger flow data from Shilaoren Bathing Beach Station on Qingdao Metro Line 2,a grey prediction model was established and tested.The data were classified into six states according to their relative errors for Markov state modeling,and the classification results were validated.A state transition probability matrix and the corresponding k-step transition probabilities were then established.The unbiased grey Markov chain prediction model was used to predict the passenger flow data of existing stations in the next 3 months.By comparing the prediction results with the actual passenger flow data,it was found that the prediction error after optimization by the unbiased grey Markov model was controlled within 10%,which corresponded well with the actual characteristics of urban rail transit passenger flows.This model is suitable for predicting the passenger flows of existing urban rail transit stations and can provide an effective reference for managing subway operations and ensuring safety. 展开更多
关键词 Passenger flow forecast New additional stations Grey theory Unbiased test Markov test
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Bayesian parametric calibration of Shanghai deep clayey soil with CPTu data under partial drainage conditions 认领 引用
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作者 Changhong Wang Tian Fang +2 位作者 Zhaoxin Wu Kun Wang Daofei Tang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期3003-3022,共20页
The constraint in the engineering applications of Shanghai,China,involving the deep 8th soil layer of clay,lies between drained and undrained circumstances,which impacts the stress–strain relationship of the clayey s... The constraint in the engineering applications of Shanghai,China,involving the deep 8th soil layer of clay,lies between drained and undrained circumstances,which impacts the stress–strain relationship of the clayey soil.Existing constitutive models cannot fully reflect the partial drainage mechanics,and the geotechnical parameters exhibit substantial randomness in a natural environment.Hence,it is difficult to describe the mechanical behaviors of deep clayey soil if only uniform geotechnical parameters are used.Based on the Modified Cam–Clay(MCC)model and asymptotic state theory,an enhanced constitutive model considering partial drainage is proposed.Moreover,by embedding the comprehensive model into the cylindrical cavity expansion theory,the mechanical interpretation of the piezocone penetration test(CPTu)data is derived.Combined with the in‑situ test data,key constitutive parameters are calibrated by the stochastic mechanics‑based Bayesian method.Firstly,the MCC model considering the asymptotic state is proposed.Secondly,the enhanced MCC model is combined with cylindrical cavity expansion theory to establish the mechanical transformation model between key geotechnical parameters and CPTu data.Finally,taking the extremely deep foundation pit of the Yunling comprehensive facility in Shanghai,China,as an example,the method of calibrating key geotechnical parameters is studied by the Markov Chain Monte Carlo(MCMC)algorithm.Using the calibrated parameters,the construction process of the ultra‑deep foundation pit excavation is simulated,and the numerical results are compared with the monitoring data.The results show that using CPTu data to determine the strain increment ratio can reasonably obtain the strength indices and other important constitutive parameters under partial drainage conditions.Bayesian calibration significantly reduces the randomness of geotechnical parameters,thereby providing reliable predictions for infrastructure design and construction. 展开更多
关键词 Partial drainage Constitutive model Piezocone penetration test Cylindrical cavity expansion theory Bayesian method MCMC sampling
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基于广义三阶剪切变形板理论的地下连续墙侧向变形计算方法 认领 引用 被引量：1
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作者 童立红 刘彤 +2 位作者 丁海滨 徐长节 郭望龙 《工程力学》 EI CSCD 北大核心 2026年第5期97-111,共15页
内撑式地下连续墙是深基坑常用的支护形式,在基坑开挖中的地下连续墙侧向变形控制是基坑设计和施工的关键。为快速准确的对地下连续墙侧向变形进行预测,该文基于广义三阶剪切变形板理论,考虑墙体两侧土体和支撑共同作用,建立了地下连续... 内撑式地下连续墙是深基坑常用的支护形式,在基坑开挖中的地下连续墙侧向变形控制是基坑设计和施工的关键。为快速准确的对地下连续墙侧向变形进行预测,该文基于广义三阶剪切变形板理论,考虑墙体两侧土体和支撑共同作用,建立了地下连续墙变形计算模型,结合Pb-2瑞利-里茨法及最小势能原理建立了墙体侧向变形求解体系,获得了地下连续墙在开挖过程中的侧向变形。为验证该文计算方法的适用性,进行了室内模型试验模拟基坑开挖,测得理论不同厚度的地下连续墙在各个开挖阶段的变形发展;通过将理论预测值与实测数据对比发现该文提出的计算模型能较好的反映地下连续墙的变形发展,验证了计算模型的正确性。该文提出的计算理论能综合考虑不同开挖深度和支护布置方案,对地下连续墙侧向变形进行较为精确的计算,为基坑围护结构设计优化及施工提供技术支撑。 展开更多
关键词 广义三阶剪切变形板理论 地下连续墙 侧向变形 能量法 模型试验
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语文“试卷结构”的设计维度与具体形态——测评理论与国际母语测评实践的双重考察 认领 引用 被引量：2
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作者 叶丽新 《课程·教材·教法》 CSSCI 北大核心 2026年第1期90-98,共9页
试卷结构是考试命题需要重点考虑的基本问题之一。整合研究与实践成果,试卷结构设计需要综合考虑卷数、考试内容、认知目标、题量、题型、难度、分数、时限等多个维度。从其中较为显性的维度考察国际母语测评试卷,可以发现如下特点:试卷... 试卷结构是考试命题需要重点考虑的基本问题之一。整合研究与实践成果,试卷结构设计需要综合考虑卷数、考试内容、认知目标、题量、题型、难度、分数、时限等多个维度。从其中较为显性的维度考察国际母语测评试卷,可以发现如下特点:试卷有1—5卷不等;试卷内容结构通常由母语课程实践活动类型、学科本体知识类型及情境任务(或问题)解决过程等协同架构而成;题型各有侧重,题型结构多样;考试时限均较为充裕,并且板块测试时间标注清晰。未来,研究与实践层面需要加强互动,注重试卷结构各维度之间的协同设计,积极运用信息技术,进一步探索符合课程改革与评价改革需要、贴合特定考试目的的语文试卷结构形态。 展开更多
关键词 试卷结构 测评理论 国际母语测评实践
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预应力无腹筋UHPC-RC组合梁抗剪性能 认领 引用 被引量：1
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作者 吴红林 季振明 +3 位作者 马玉全 孙向东 范学明 蒋峰 《吉林大学学报（工学版）》 EI CAS CSCD 北大核心 2026年第4期1058-1069,共12页
为了探究UHPC-RC无腹筋梁的抗剪力学性能,开展了15根足尺寸UHPC-RC无腹筋梁抗剪试验,系统研究了剪跨比、腹板厚度、钢纤维掺量、压应力水平等关键构造参数对UHPC-RC无腹筋梁抗剪性能的影响,并基于修正压力场理论和分项叠加的思想,建立... 为了探究UHPC-RC无腹筋梁的抗剪力学性能,开展了15根足尺寸UHPC-RC无腹筋梁抗剪试验,系统研究了剪跨比、腹板厚度、钢纤维掺量、压应力水平等关键构造参数对UHPC-RC无腹筋梁抗剪性能的影响,并基于修正压力场理论和分项叠加的思想,建立了综合考虑顶板压剪区、腹板斜剪区、底板拉剪区的抗剪承载力计算模型,试验结果表明,本文抗剪计算方法可较为准确地计算预应力无腹筋UHPC-RC组合梁的抗剪承载力。试验参数分析表明:UHPC-RC无腹筋梁抗剪极限承载力随剪跨比的增大而减小;钢纤维掺量对其抗剪极限承载力具有一定影响;抗剪极限承载力随着腹板厚度的增大而增大;抗剪极限承载力随着压应力水平的增大而增大;施加预应力能提高结构的抗剪极限承载力和初始刚度。 展开更多
关键词 桥梁工程 无腹筋UHPC-RC梁 抗剪承载力 修正压力场理论 足尺寸试验
Double-Double铺层机身结构材料性能试验研究 认领 引用
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作者 郑传祥 来晓靓 +6 位作者 沈益林 纪毓杨 顾汝佳 宋兆波 俞轶宸 卢锦杰 Stephen Tsai 《高科技纤维与应用》 CAS 2026年第3期80-87,共8页
Double-Double(下称DD)铺层可以将常用传统的层合板用二个角度±φ、±ψ的四种组合来替代,如果根据载荷情况对φ、ψ的数值进行优化,则层合板的承载性能可以得到提高,如果采用相同的安全系数,则层数可以减少以达到减重的目的... Double-Double(下称DD)铺层可以将常用传统的层合板用二个角度±φ、±ψ的四种组合来替代,如果根据载荷情况对φ、ψ的数值进行优化,则层合板的承载性能可以得到提高,如果采用相同的安全系数,则层数可以减少以达到减重的目的。本文从DD铺层材料的性能试验出发,对优化设计后的DD材料进行压缩试验,然后对DD铺层材料的试件进行性能模拟,通过与试验结果的对比可以发现,采用Tsai-Wu强度理论为失效判据时,模拟结果与试验结果符合得很好,证明了有限元模拟的准确性和可靠性;以此模拟方法对优化后的机身结构进行强度计算,建立了一块3 m×2 m级曲板,通过计算可以发现,相同载荷下,机身重量可以得到较大的减轻。 展开更多
关键词 Double-Double理论 机身 试验 研究
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