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Improved adaptively robust estimation algorithm for GNSS spoofer considering continuous observation error 认领 引用 被引量：4
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作者 GAO Yangjun LI Guangyun +2 位作者 LYU Zhiwei ZHANG Lundong LI Zhongpan 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2022年第5期1237-1248,共12页
Once the spoofer has controlled the navigation sys-tem of unmanned aerial vehicle(UAV),it is hard to effectively control the error convergence to meet the threshold condition only by adjusting parameters of estimation... Once the spoofer has controlled the navigation sys-tem of unmanned aerial vehicle(UAV),it is hard to effectively control the error convergence to meet the threshold condition only by adjusting parameters of estimation if estimation of the spoofer on UAV has continuous observation error.Aiming at this problem,the influence of the spoofer’s state estimation error on spoofing effect and error convergence conditions is theoretically analyzed,and an improved adaptively robust estimation algo-rithm suitable for steady-state linear quadratic estimator is pro-posed.It enables the spoofer’s estimator to reliably estimate UAV status in real time,improves the robustness of the estima-tor in responding to observation errors,and accelerates the con-vergence time of error control.Simulation experiments show that the mean value of normalized innovation squared(NIS)is reduced by 88.5%,and the convergence time of NIS value is reduced by 76.3%,the convergence time of true trajectory error of UAV is reduced by 42.3%,the convergence time of estimated trajectory error of UAV is reduced by 67.4%,the convergence time of estimated trajectory error of the spoofer is reduced by 33.7%,and the convergence time of broadcast trajectory error of the spoofer is reduced by 54.8%when the improved algorithm is used.The improved algorithm can make UAV deviate from pre-set trajectory to spoofing trajectory more effectively and more subtly. 展开更多
关键词 spoofing unmanned aerial vehicle(UAV) spoofer adaptively robust estimation global navigation satellite system(GNSS) normalized innovation squared(NIS)
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An investigation on adaptively machining the leading and tailing edges of an SPF/DB titanium hollow blade using free-form deformation 认领 引用 被引量：15
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作者 Zhengcai ZHAO Jiuhua XU +1 位作者 Yucan FU Zhiqiang LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2018年第1期178-186,共9页
Titanium hollow blades are characterized with lightweight and high structural strength, which are widely used in advanced aircraft engines nowadays. Superplastic forming/diffusion bonding （SPF/DB） combined with nume... Titanium hollow blades are characterized with lightweight and high structural strength, which are widely used in advanced aircraft engines nowadays. Superplastic forming/diffusion bonding （SPF/DB） combined with numerical control （NC） milling is a major solution for manufacturing titanium hollow blades. Due to the shape deviation caused by multiple heat and pressure cycles in the SPF/DB process, it is hard to manufacture the leading and tailing edges by the milling process. This paper presents a new adaptive machining approach using free-form deformation to solve this problem. The actual SPF/DB shape of a hollow blade was firstly inspected by an on-machine measurement method. The measured point data were matched to the nominal SPF/DB shape with an improved ICP algorithm afterwards, by which the point-pairs between the measurement points and their corresponding points on the nominal SPF/DB shape were established, and the maximum modification amount of the final nominal shape was constrained. Based on the displacements between the point-pairs, an accurate FFD volume was iteratively calculated. By embedding the final nominal shape in the deformation space, a new final shape of the hollow blade was built. Finally, a series of measurement and machining tests was performed, the results of which validated the feasibility of the proposed adaptive machining approach. 展开更多
关键词 Adaptive machining Blade geometry Free-form deformation Reconstruction Titanium
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Comparison of Two Fading Filters anc Adaptively Robust Filter 认领 引用 被引量：13
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作者 YANG Yuanxi GAO Weiguang 《Geo-Spatial Information Science》 EI 2007年第3期200-203,共4页
Two kinds of fading filters and their principles are introduced. An adaptive robust filter is given with corresponding principle. The basic abilities of the fading filters and adaptively robust filter in controlling t... Two kinds of fading filters and their principles are introduced. An adaptive robust filter is given with corresponding principle. The basic abilities of the fading filters and adaptively robust filter in controlling the influences of the kinematic model errors are analyzed. A practical example is given. The results of the fading filter and adaptively robust filter are compared and analyzed. 展开更多
关键词 Kalman filtering fading filtering adaptive filtering fading factor
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Decoding on Adaptively Pruned Trellis for Correcting Synchronization Errors 认领 引用 被引量：4
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作者 Yuan Liu Weigang Chen 《China Communications》 SCIE CSCD 2017年第7期163-171,共9页
Forward-backward algorithm, used by watermark decoder for correcting non-binary synchronization errors, requires to traverse a very large scale trellis in order to achieve the proper posterior probability, leading to ... Forward-backward algorithm, used by watermark decoder for correcting non-binary synchronization errors, requires to traverse a very large scale trellis in order to achieve the proper posterior probability, leading to high computational complexity. In order to reduce the number of the states involved in the computation, an adaptive pruning method for the trellis is proposed. In this scheme, we prune the states which have the low forward-backward quantities below a carefully-chosen threshold. Thus, a wandering trellis with much less states is achieved, which contains most of the states with quite high probability. Simulation results reveal that, with the proper scaling factor, significant complexity reduction in the forward-backward algorithm is achieved at the expense of slight performance degradation. 展开更多
关键词 forward-backward algorithm non-binary synchronization errors adaptive pruning method complexity reduction
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Adaptively Secure Attribute-Based Encryption Supporting Attribute Revocation 认领 引用 被引量：2
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作者 Wu Qiuxin Zhang Miao 《China Communications》 SCIE CSCD 2012年第9期22-40,共19页
Attribute revocation is inevitable and al- so important for Attribute-Based Encryption （ABE） in practice. However, little attention has been paid to this issue, and it retrains one of the rmin obsta-cles for the app... Attribute revocation is inevitable and al- so important for Attribute-Based Encryption （ABE） in practice. However, little attention has been paid to this issue, and it retrains one of the rmin obsta-cles for the application of ABE. Most of existing ABE schemes support attribute revocation work under indirect revocation model such that all the users＇ private keys will be affected when the revo-cation events occur. Though some ABE schemes have realized revocation under direct revocation model such that the revocation list is embedded in the ciphertext and none of the users＇ private keys will be affected by revocation, they mostly focused on the user revocation that revokes the user＇s whole attributes, or they can only be proven to be selectively secure. In this paper, we first define a model of adaptively secure ABE supporting the at- tribute revocation under direct revocation model. Then we propose a Key-Policy ABE （KP-ABE） scheme and a Ciphertext-Policy ABE （CP-ABE） scheme on composite order bilinear groups. Finally, we prove our schemes to be adaptively secure by employing the methodology of dual system eno cryption. 展开更多
关键词 ABE direct revocation model attributerevocation adaptive security dual system encryp-tion access structure
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Numerical simulation of viscous flows with adaptively refined Cartesian grid 认领 引用
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作者 HAN Yu-qi GAO Ge 《航空动力学报》 EI CAS CSCD 北大核心 2014年第2期467-474,共8页
Quadtree-based Cartesian grid was automatically generated from specified geometry.Adaptive refinements were performed according to geometric parameters and solution of flow field.An altered CCST(curvature corrected sy... Quadtree-based Cartesian grid was automatically generated from specified geometry.Adaptive refinements were performed according to geometric parameters and solution of flow field.An altered CCST(curvature corrected symmetry technique)approach was proposed to apply solid wall boundary conditions. Driven flows in a square cavity and flows around NACA0012airfoil were simulated and compared with the result of published structured grid and stretched Cartesian grid.The results show that solid wall boundary condition are accurately applied by current altered CCST approach,while incompressible/compressible subsonic, transonic and supersonic viscous flows are adequately simulated with adaptively refined Cartesian grid. 展开更多
关键词 adaptively refined Cartesian grid viscous flow CCST(curvature corrected symmetry technique) boundary condition
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Satellite Constellation Design with Adaptively Continuous Ant System Algorithm 认领 引用 被引量：7
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作者 He Quan Han Chao 《Chinese Journal of Aeronautics》 SCIE EI CAS 2007年第4期297-303,共7页
The ant system algorithm （ASA） has proved to be a novel meta-heuristic algorithm to solve many multivariable problems. In this paper, the earth coverage of satellite constellation is analyzed and a n ＋ 1^ -fold cov... The ant system algorithm （ASA） has proved to be a novel meta-heuristic algorithm to solve many multivariable problems. In this paper, the earth coverage of satellite constellation is analyzed and a n ＋ 1^ -fold coverage rate is put forward to evaluate the coverage performance of a satellite constellation. An optimization model of constellation parameters is established on the basis of the coverage performance. As a newly developed method, ASA can be applied to optimize the constellation parameters. In order to improve the ASA, a rule for adaptive number of ants is proposed, by which the search range is obviously enlarged and the convergence speed increased. Simulation results have shown that the ASA is more quick and efficient than other methodV211.71s. 展开更多
关键词 ant system algorithm satellite constellation optimization design coverage performance adaptive adjusting
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Uniform Convergence of Multigrid V-Cycle on Adaptively Refined Finite Element Meshes for Elliptic Problems with Discontinuous Coefficients 认领 引用 被引量：1
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作者 Haijun Wu Weiying Zheng 《Communications in Mathematical Research》 CSCD 2023年第3期437-475,共39页
The multigrid V-cycle methods for adaptive finite element discretizations of two-dimensional elliptic problems with discontinuous coefficients are considered.Under the conditions that the coefficient is quasi-monotone... The multigrid V-cycle methods for adaptive finite element discretizations of two-dimensional elliptic problems with discontinuous coefficients are considered.Under the conditions that the coefficient is quasi-monotone up to a constant and the meshes are locally refined by using the newest vertex bisection algorithm,some uniform convergence results are proved for the standard multigrid V-cycle algorithm with Gauss-Seidel relaxations performed only on new nodes and their immediate neighbours.The multigrid V-cycle algorithm uses O(N)operations per iteration and is optimal. 展开更多
关键词 Multigrid adaptive finite elements elliptic problems discontinuous coefficients uniform convergence
PARALLEL ADAPTIVELY MODIFIED CHARACTERISTIC BASIS FUNCTION METHOD BASED ON STATIC LOAD BALANCE 认领 引用
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作者 Dai Fei Han Guodong Gu Changqing 《Journal of Electronics(China)》 2009年第4期532-536,共5页
Characteristic Basis Function Method (CBFM) is a novel approach for analyzing the ElectroMagnetic (EM) scattering from electrically large objects. Based on dividing the studied object into small blocks, the CBFM is su... Characteristic Basis Function Method (CBFM) is a novel approach for analyzing the ElectroMagnetic (EM) scattering from electrically large objects. Based on dividing the studied object into small blocks, the CBFM is suitable for parallel computing. In this paper, a static load balance parallel method is presented by combining Message Passing Interface (MPI) with Adaptively Modified CBFM (AMCBFM). In this method, the object geometry is partitioned into distinct blocks, and the serial number of blocks is sent to related nodes according to a certain rule. Every node only needs to calculate the information on local blocks. The obtained results confirm the accuracy and efficiency of the proposed method in speeding up solving large electrical scale problems. 展开更多
关键词 Adaptively Modified Characteristic Basis Function Method （AMCBFM） Parallel algo- rithm Static load balance
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Uniform Convergence Analysis of Finite Difference Scheme for Singularly Perturbed Delay Differential Equation on an Adaptively Generated Grid 认领 引用 被引量：2
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作者 Jugal Mohapatra Srinivasan Natesan 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2010年第1期1-22,共22页
Adaptive grid methods are established as valuable computational technique in approximating effectively the solutions of problems with boundary or interior layers. In this paper,we present the analysis of an upwind sch... Adaptive grid methods are established as valuable computational technique in approximating effectively the solutions of problems with boundary or interior layers. In this paper,we present the analysis of an upwind scheme for singularly perturbed differential-difference equation on a grid which is formed by equidistributing arc-length monitor function.It is shown that the discrete solution obtained converges uniformly with respect to the perturbation parameter.Numerical experiments illustrate in practice the result of convergence proved theoretically. 展开更多
关键词 Singular perturbation problems delay differential equations boundary layer upwind scheme adaptive mesh uniform convergence.
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Projection-Based Dimensional Reduction of Adaptively Refined Nonlinear Models 认领 引用
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作者 Clayton Little Charbel Farhat 《Communications on Applied Mathematics and Computation》 EI 2024年第3期1779-1800,共22页
Adaptive mesh refinement (AMR) is fairly practiced in the context of high-dimensional, mesh-based computational models. However, it is in its infancy in that of low-dimensional, generalized-coordinate-based computatio... Adaptive mesh refinement (AMR) is fairly practiced in the context of high-dimensional, mesh-based computational models. However, it is in its infancy in that of low-dimensional, generalized-coordinate-based computational models such as projection-based reduced-order models. This paper presents a complete framework for projection-based model order reduction (PMOR) of nonlinear problems in the presence of AMR that builds on elements from existing methods and augments them with critical new contributions. In particular, it proposes an analytical algorithm for computing a pseudo-meshless inner product between adapted solution snapshots for the purpose of clustering and PMOR. It exploits hyperreduction—specifically, the energy-conserving sampling and weighting hyperreduction method—to deliver for nonlinear and/or parametric problems the desired computational gains. Most importantly, the proposed framework for PMOR in the presence of AMR capitalizes on the concept of state-local reduced-order bases to make the most of the notion of a supermesh, while achieving computational tractability. Its features are illustrated with CFD applications grounded in AMR and its significance is demonstrated by the reported wall-clock speedup factors. 展开更多
关键词 Adaptive mesh refinement(AMR) Computational fluid dynamics Energy-conserving sampling and weighting(ECSW) Model order reduction Reduced-order model Supermesh
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Dehazing algorithm for adaptively corrected transmission under multiscale morphology 认领 引用
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作者 ZHANG Shuai YANG Yan 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2024年第4期477-489,共13页
In order to solve the problems of color bias and visual deviation caused by inaccurate estimation of transmittance and atmospheric light in image defogging,a new algorithm based on multi-scale morphological reconstruc... In order to solve the problems of color bias and visual deviation caused by inaccurate estimation of transmittance and atmospheric light in image defogging,a new algorithm based on multi-scale morphological reconstruction with adaptive transmittance and atmospheric light correction was proposed.Firstly,the algorithm used the open operation under morphological reconstruction to replace the minimum filter operation in the dark channel,and used the morphological edge to set the scale of the open operation structure elements,and constructed a multi-scale open operation fusion dark channel.After morphological noise reduction,the exact initial transmittance was obtained.According to the relationship between brightness and saturation difference and transmittance,an adaptive transmittance correction model was fitted with Gaussian function to correct the initial transmittance of the sky fog map.Then the local atmospheric light was improved according to the image brightness information and morphology closure operation.Finally,the proposed algorithm was combined with the atmospheric scattering model to obtain an accurate fog free image.The experimental results showed that the proposed algorithm was suitable for fog image restoration under various scenes,the restoration effect was good,and the brightness was suitable. 展开更多
关键词 image dehazing morphological reconfiguration multi-scale fusion dark channel adaptive correction multi-scene recovery
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Adaptively Controlled Hybrid Welding Using a High Brightness Laser 认领 引用 被引量：1
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作者 C.M.Allen G.S hi P.A.Hilton 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2011年第S4期1-5,共5页
Hybrid laser-MAG welding with real-time adaptive control has been demonstrated.Hybrid welding conditions have been developed to produce ISO 13919-1 class B(stringent)quality butt welds between 8mm thickness steel plat... Hybrid laser-MAG welding with real-time adaptive control has been demonstrated.Hybrid welding conditions have been developed to produce ISO 13919-1 class B(stringent)quality butt welds between 8mm thickness steel plates,using a 5kW 6mm.mrad Yb fibre laser combined with conventional arc welding equipment.A laser vision seam tracking system has enabled a 7-axis robot,manipulating the hybrid welding head,to track butt joints in real time during welding.The laser vision system has also provided information on the variations in joint fit-up,in particular the width of any gaps,or height of any mismatches present.This information has then been used to automatically adjust the robot position or speed,or arc welding parameters,depending on the fit-up detected.In this way,the tolerance of the hybrid process has been augmented,producing stringent quality welds over a wider range of joint fit-up cases than when using fixed conditions alone. 展开更多
关键词 hybrid welding steel adaptive control fit-up tolerance
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Range-separated hybrid functionals in full-potential LAPW using adaptively compressed exchange 认领 引用 被引量：1
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作者 Jānis Užulis Aleksandr V.Sorokin Andris Gulans 《npj Computational Materials》 SCIE EI CSCD 2025年第1期2752-2762,共11页
The adaptively compressed exchange(ACE)operator is a low-rank representation of the Fock exchange,avoiding any loss of precision.We present an application of this method in the formalism of linearized augmented plane ... The adaptively compressed exchange(ACE)operator is a low-rank representation of the Fock exchange,avoiding any loss of precision.We present an application of this method in the formalism of linearized augmented plane waves(LAPW)to hybrid functionals with range separation.For this purpose,we extend the functionality of the LAPW-specific Poisson solver employing the pseudocharge method for the short-and long-range interaction kernels.To make these calculations more affordable,we revise the most expensive steps in the pseudocharge method and reduce their computational complexity.As a result,this implementation is a first step towards cubic-scaling hybrid calculations employing LAPW with respect to the number of atoms.We apply our code for assessing the numerical quality of band gaps computed with hybrid functionals in the literature,employing a test set consisting of 26 materials. 展开更多
关键词 fock exchangeavoiding adaptively compressed exchange linearized augmented plane waves lapw hybrid functionals range separationfor range separated hybrid functionals full potential LAPW revise most expensive steps pseudocharge method
Attack-Resilient Distributed Nash Equilibrium Seeking for Networked Games Under Unbounded FDI Attacks:Theory and Experiment 认领 引用
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作者 Zhi Feng Zhexin Shi +2 位作者 Xiwang Dong Guoqiang Hu Jinhu Lv 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第1期98-109,共12页
An attack-resilient distributed Nash equilibrium(NE) seeking problem is addressed for noncooperative games of networked systems under malicious cyber-attacks,i.e.,false data injection(FDI) attacks.Different from many ... An attack-resilient distributed Nash equilibrium(NE) seeking problem is addressed for noncooperative games of networked systems under malicious cyber-attacks,i.e.,false data injection(FDI) attacks.Different from many existing distributed NE seeking works,it is practical and challenging to get resilient adaptively distributed NE seeking under unknown and unbounded FDI attacks.An attack-resilient NE seeking algorithm that is distributed(i.e.,independent of global information on the graph's algebraic connectivity,Lipschitz and monotone constants of pseudo-gradients,or number of players),is presented by means of incorporating the consensus-based gradient play with a distributed attack identifier so as to achieve simultaneous NE seeking and attack identification asymptotically.Another key characteristic is that FDI attacks are allowed to be unknown and unbounded.By exploiting nonsmooth analysis and stability theory,the global asymptotic convergence of the developed algorithm to the NE is ensured.Moreover,we extend this design to further consider the attack-resilient NE seeking of double-integrator players.Lastly,numerical simulation and practical experiment results are presented to validate the developed algorithms' effectiveness. 展开更多
关键词 Adaptively distributed NE seeking attack-resilient mechanism noncooperative game unknown FDI attack
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Metabolic adaptations of Qingke:A review of stress resilience and nutritional functions 认领 引用 被引量：2
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作者 Congping Xu Yulin Wang +19 位作者 Naoxue Fei Yuzhen Basang Haizhen Yang Jiabu Dunzhu Hongjun Yuan Mu Wang Sang Zha Wa Da Taba Xiongnu Puci Basang Chunbao Yang Qijun Xu Zexiu Wei Yawen Gan Yawei Tang Alisdair R.Fernie Zhaoyan Chen Jie Luo Ganggang Guo Xingquan Zeng 《The Crop Journal》 SCIE CSCD 2026年第1期61-73,共13页
Qingke,a staple crop grown on the high-altitude Tibetan Plateau,has evolved a metabolomic profile providing both environmental stress resilience and human nutrition.We review the hypothesis that the metabolites that c... Qingke,a staple crop grown on the high-altitude Tibetan Plateau,has evolved a metabolomic profile providing both environmental stress resilience and human nutrition.We review the hypothesis that the metabolites that confer cold and UV resistance on the crop also facilitate human adaptation to high-altitude stresses.Specifically,β-glucans regulate blood glucose primarily via short-chain fatty acids(SCFAs)produced through gut microbiota fermentation,which directly mediate glucose homeostasis.Phenolamides accumulate via the phenylpropanoid pathway,with chalcone isomerase(CHI)serving as a key enzyme in flavonoid biosynthesis and enhancing UV-B resistance.Under low temperatures,β-glucans improve frost tolerance by modulating osmotic balance and inhibiting ice-nucleating proteins,while lipids maintain membrane fluidity to sustain cellular function during cold stress.Importantly,we explore the hypothesis that these same metabolites,upon consumption,may facilitate human adaptation to high-altitude stresses.This hypothesis is supported by preliminary epidemiological associations between Qingke consumption and favorable health outcomes in high-altitude populations,as well as established bioactivities of the implicated metabolites in vitro and in animal models.However,direct causal evidence in humans and a comprehensive understanding of the underlying molecular mechanisms remain key knowledge gaps that warrant future investigation.Qingke as a unique resource at the interface of agricultural resilience and human nutrition.Understanding its metabolic blueprint will inform the development of functional foods and climate-resilient crops. 展开更多
关键词 Qingke Metabolomics Multi-omics integration Plateau adaptation
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Speciation,endangerment and adaptation in limestone rocky environment of Urophysa(Ranunculaceae) 认领 引用 被引量：2
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作者 Deng-Feng Xie Yi-Yang Zhang +6 位作者 Jing Cai Rui-Yu Cheng Yuan Wang Jin-Bo Tan Yan Yu Xing-Jin He Song-Dong Zhou 《Plant Diversity》 SCIE CAS CSCD 2026年第2期231-245,共15页
Urophysa(Ranunculaceae)are plants endemic to the limestone regions of southern China,representing an attractive model for studying species differentiation,endangerment,and adaptive evolution in karst environments.Here... Urophysa(Ranunculaceae)are plants endemic to the limestone regions of southern China,representing an attractive model for studying species differentiation,endangerment,and adaptive evolution in karst environments.Here,we assembled a chromosome-level genome of U.rockii,and re-sequenced 97 individuals of two Urophysa species.The final genome size was 303.21 Mb with a heterozygosity level of approximately 0.26%.Demographic analyses revealed that U.rockii diverged from U.henryi around 5.95million years ago,dramatic orogenies and climatic shifts in the Hengduan Mountain(HDM)during the Late Miocene to Pleistocene enhanced population divergence and accelerated allopatric speciation.Extremely low genetic diversity was detected in U.rockii,particularly in the populations CXS and PZ(8.7×10-5 and 9.6×10-5).Long-term bottleneck effects,limited gene flow,habitat specialization and severe inbreeding collectively contributed to its endangerment status.Genomic scan(top 5%FSTandπratio)of Urophysa species identified 257 selected genes linked to karst adaptation.Complementary physiological experiments and transcriptome analyses further detected multiple candidate genes under positive selection and expansion(e.g.,TPC1,PTR/POT,and CAX3).Maintaining cell wall integrity,regulating ion absorption and excretion,and sequestering excess ions into organelles(e.g.,vacuole and mitochondrion)are key survival strategies for Urophysa species in harsh limestone rocky environments.Our findings elucidate the evolutionary patterns and mechanisms underlying species adaptation to karst ecosystems,and identify key drivers of endangerment within such ecologically specialized habitats. 展开更多
关键词 Urophysa Demographic history Species divergence Endangerment Karst adaptation
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GcH1 contributes to high-altitude adaptation in Tibetans by regulating blood nitric oxide 认领 引用 被引量：2
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作者 Yongbo Guo Wangshan Zheng +6 位作者 Tian Yue Baimakangzhuo Xuebin Qi Kai Liu Liya Li Yaoxi He Bing Su 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2026年第1期97-109,共13页
Nitric oxide(NO)is a key vasodilator that regulates vascular pressure and blood flow.Tibetans have developed a"blunted"mechanism for regulating NO levels at high altitude,with GTP cyclohydrolase 1(GCH1)ident... Nitric oxide(NO)is a key vasodilator that regulates vascular pressure and blood flow.Tibetans have developed a"blunted"mechanism for regulating NO levels at high altitude,with GTP cyclohydrolase 1(GCH1)identified as a key candidate gene.Here,we present comprehensive genetic and functional analyses of GCH1,which exhibits strong Darwinian positive selection in Tibetans.We show that Tibetan-enriched GCH1 variants down-regulate its expression in the blood of Tibetans.Based on this observation,we generate the heterozygous Gch1 knockout(Gch1+/-)mouse model to simulate its downregulation in Tibetans.We find that under prolonged hypoxia,the Gch1+/-mice have relatively higher blood NO and blood oxygen saturation levels compared with the wild-type(WT)controls,providing better oxygen supplies to the cardiovascular and pulmonary systems.Markedly,hypoxia-induced cardiac hypertrophy and pulmonary remodeling are significantly attenuated in the Gch1^(+/-)mice compared with the WT controls,likely due to the adaptive changes in molecular regulations related to metabolism,inflammation,circadian rhythm,extracellular matrix,and oxidative stress.This study sheds light on the role of GCH1 in regulating blood NO,contributing to the physiological adaptation of the cardiovascular and pulmonary systems in Tibetans at high altitude. 展开更多
关键词 GCH1 Nitric oxide Tibetans High altitude Hypoxia Adaptation
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Chromosome-level genome assembly and population genomics analysis of Camellia rubituberculata provide insights into adaptation to karst habitats 认领 引用 被引量：2
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作者 Chao Yan Ming-tai An +4 位作者 Ming Tang Xin-xiang Bai Xu Xiao Zhao-hui Ran Zhi Li 《Plant Diversity》 SCIE CAS CSCD 2026年第2期246-261,共16页
Karst flora confined to isolated‘habitat islands'evolve specialized adaptations and unique traits,serving as ideal models for investigating adaptive evolution and species diversification mechanisms.Camellia rubit... Karst flora confined to isolated‘habitat islands'evolve specialized adaptations and unique traits,serving as ideal models for investigating adaptive evolution and species diversification mechanisms.Camellia rubituberculata,endemic to the karst habitats of Guizhou,China,can serve as a model for adaptive evolution and diversity in karst-endemic woody species.However,the lack of a chromosome-level genome for this species has limited in-depth studies on its adaptations to karst and posed a barrier to its genetic improvement.In this study,a chromosome-level genome assembly of C.rubituberculata was generated,with 15 pseudo-chromosomes and a genome size of 2.50 Gb(scaffold N50=168.34 Mb,55,302 protein-coding genes).Comparative genomics revealed two whole-genome duplications(WGDs),namely,an ancient γ-event(~120 Mya)and a subsequent genus-wide event(~86 Mya),after which gene families linked to karst adaptation(e.g.,photosynthesis)were significantly expanded.Selective sweep analysis showed that selected genes were associated with phytohormone transmission and metabolism.Genes functionally annotated as involved in stress responses—including SAUR,BSK,NCL,CDPK,and NDPK—participate in calcium homeostasis and ion transport pathways under karstspecific stresses.MYB transcription factors,which are crucial in plant responses to stresses,including drought,may be key for adaptation to the high salinity and drought stress in karst environments.The divergent selection in wild and cultivated groups highlight key adaptations in plant hormone transduction and calcium transport.By elucidating karst adaptation in C.rubituberculata,this work establishes essential genomic resources for advancing genetic evolution research and molecular breeding across Camellia species. 展开更多
关键词 Camellia rubituberculata Endemic species Genome assembly Karst adaptation Population genetics
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A physics-based probabilistic method for assessment of landslide-induced wave run-up hazards 认领 引用 被引量：2
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作者 Ningjie Li Xinli Hu +3 位作者 Jian Wang Junxiang Huang Hongchao Zheng Wei Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3675-3687,共13页
Traditional deterministic numerical simulation often has a poor prediction performance for landslide-induced wave run-up(LIWR)hazards,as it neglects the effects of uncertainty.The limitation for efficiently quantifyin... Traditional deterministic numerical simulation often has a poor prediction performance for landslide-induced wave run-up(LIWR)hazards,as it neglects the effects of uncertainty.The limitation for efficiently quantifying the uncertainties in primary parameters remains largely unsolved.In this study,we propose a probabilistic evaluation method,integrating the adaptive Kriging(AK)metamodel method and probability density evolution method(PDEM)based on generalized F-discrepancy.A Taylor expansion-based adaptive design strategy is applied to construct the global AK model over representative points generated by generalized F-discrepancy,thereby approximating the numerical physical response(i.e.,maximum LIWR).Using these approximate responses,the PDEM is used to compute the exceedance probabilities that LIWR heights exceed elements at risk based on a construction of virtual time,and then a probabilistic criterion is introduced to classify hazard zones.The proposed method is demonstrated via two examples:Example I,which possesses risk element(building),and Example Ⅱ with water-level variations.The results indicate that the proposed method has an acceptable performance(showing a 1.7%difference in exceedance probability compared to Monte Carlo simulation with 50,000 samples)with low computation cost(requiring 284 deterministic analyses).For two specific scenarios in this study,the wave induced by the landslide exhibits a solitary-like leading wave.The proposed probabilistic method provides promising prospects for quantifying LIWR uncertainties,and is helpful for direct,efficient,and low-cost quantification assessment of cascading hazards. 展开更多
关键词 Landslide-induced wave run-up(LIWR) Numerical simulation Adaptive metamodel Probability density evolution method(PDEM) Hazard zoning
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