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Validation method for simulation models with cross iteration

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Journal of Systems Engineering and Electronics 2019年第3期30卷 555-563页

作者： FANG ke zhao Kaibin ZHOU Yuchen Control and Simulation Center Harbin Institute of Technology

Cross iteration often exists in the computational process of the simulation models, especially for control models. There is a credibility defect tracing problem in the validation of models with cross iteration. In order to resolve this problem, after the problem formulation, a validation theorem on the cross iteration is proposed, and the proof of the theorem is given under the cross iteration circumstance. Meanwhile, applying the proposed theorem, the credibility calculation algorithm is provided, and the solvent of the defect tracing is explained. Further, based on the validation theorem on the cross iteration, a validation method for simulation models with the cross iteration is proposed, which is illustrated by a flowchart step by step. Finally, a validation example of a sixdegree of freedom (DOF) flight vehicle model is provided, and the validation process is performed by using the validation method. The result analysis shows that the method is effective to obtain the credibility of the model and accomplish the defect tracing of the validation.

关键词： validation method simulation model cross iteration validation theorem validation example

Optimizing Emergency Logistics for the Offsite Hazardous Waste Management

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Journal of Systems Science and Systems Engineering 2019年第6期28卷 747-765页

作者： Jiahong zhao Ginger Y.ke School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China Faculty of Business Administration Memorial University of NewfoundlandSt.John'sNewfoundland and LabradorCanada A1B 3X5

Hazardous wastes pose increasing threats to people and environment during the processes of offsite collection,storage,treatment,and disposal.A novel game theoretic model,including two levels,is developed for the corresponding optimization of emergency logistics,where the upper level indicates the location and capacity problem for the regulator,and the lower level reflects the allocation problem for the emergency *** from other works in the literature,we focus on the issue of multi-quality coverages (full and partial coverages) in the optimization of facility location and *** be specific,the regulator decides the location plan and the corresponding capacity of storing emergency groups for multiple types of hazmats,so to minimizes the total potential environmental risk posed by incident sites;while the commander minimizes the total costs to provide an efficient allocation *** solve the bi-level programming model,two solution techniques,namely a KKT condition approach and a heuristic model,are designed and *** proposed model and solution techniques are then applied to a hypothetical case and a real-world case to demonstrate the practicality and provide managerial insights.

关键词： Bi-level programming hazardous material time-based risk assessment multi-quality covering model KKT heuristic technique

NF-κB/HDAC1/SREBP1c pathway mediates the inflammation signal in progression of hepatic steatosis

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Acta Pharmaceutica Sinica B 2020年第5期10卷 825-836页

作者： Yunwei Guo Xiaoying Zhang Zhiyun zhao Hongyun Lu Bilun ke xin Ye Bin Wu Jianping Ye Department of Gastroenterology Third Affiliated HospitalSun Yat-sen UniversityGuangzhou 510630China Shanghai Diabetes Institute Shanghai Sixth People’s HospitalShanghai Jiao Tong UniversityShanghai 200233China Antioxidant and Gene Regulation Laboratory Pennington Biomedical Research CenterLouisiana State University SystemBaton RougeLA 70808USA

The transcription factor nuclear factor kappa B(NF-κB)is activated in hepatoctes in the pathogenesis of hepatic ***,the action mechanism of NF-κB remains to be established in the hepatic *** this study,the P50 subunit of NF-κB was found to promote the hepatic steatosis through regulation of histone deacetylase 1(HDAC1)in *** activity was supported by the phenotypes of P50 knockout(P50-KO)mice and P65 knockout(P65-KO)*** steatosis was reduced in the P50-KO mice,but not in the P65-KO *** reduction was a result of inhibition of HDAC1 activity in the P50-KO *** of Hdac1 gene led to suppression of hepatocyte steatosis in HepG2 cells.A decrease in sterol-regulatory element binding protein lc(SREBP1 c)protein was observed in the liver of P50-KO mice and in cell with Hdac1 *** decrease was associated with an increase in succinylation of SREBP1 c *** study suggests that P50 stabilizes HDAC1 to support the SREBP1 c activity in hepatic steatosis in the pathophysiological *** of this novel pathway in the P50-KO,but not the P65-KO mice,may account for the difference in hepatic phenotypes in the two lines of transgenic mice.

关键词： NF-KB HDAC1 SREBP1 Succinylation Hepatic steatosis

Crystal Structure and Spectra Characters of 2-Benzoly-3-(4-(1,2,4-triazole)-5-anilino-thiophene and 2-(4-Methyl-benzoly)-3-(4- chlrolphenyl)-3-(1,2,4-triazole)-5-anilino-thiophene

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有机化学 2004年第Z1期24卷 25-26页

作者： CAO,ke-Guang WANG,Zhong-Wei zhao,xin-Qi School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 Chengde Petroleum College Chengde 067000 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081

　　Triazole derivatives are widely studied, because they represent the largest group of modern fungicides and are widely used both in human and veterinary therapy and in agriculture. We synthesized the title compound in which the thiophene ring was substituted by a 1,2,4-triazole group, a phenacyl group, a phenylaminol group and a benzene ring.……

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Crack mystery of the damaging Kumamoto earthquakes

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Science Bulletin 2016年第11期61卷 868-870页

作者： Dapeng zhao xin Liu Department of Geophysics Tohoku University College of Marine Geosciences Ocean University of China

The 2016 Kumamoto earthquake(M 7.3 in the Japan Meteorological Agency(JMA)scale)sequence wrote a new chapter of active seismotectonics and subduction dynamics in the Japan *** earthquake sequence,

关键词：地震序列破坏性日本气象厅裂缝活动构造 Moto 动力学上地壳

Extracting angle-domain common-image gathers in VTI media using ansiotropic-Helmholtz P/S wave-mode decomposition

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Petroleum Science 2023年第3期20卷 1546-1561页

作者： Le-Le Zhang Yang zhao Lu Liu ke Chen Jia-Hui Zuo Yi-xin Wang Ji-Dong Yang State key Laboratory of Petroleum Resource and Prospecting Unconventional Petroleum Research InstituteChina University of PetroleumBeijing102249China Aramco Beijing Research Center Aramco AsiaBejing100102China Department of Geophysics China University of Petroleum(East China)QingdaoShandong266580China

Common-image gathers are extensively used in amplitude versus angle(AVA)and migration velocity analysis(MVA).The current state of methods for anisotropic angle gathers extraction use slant-stack,local Fourier transform or low-rank approximation,which requires much *** on an anisotropic-Helmholtz P/S wave-mode decomposition method,we propose a novel and efficient approach to produce angle-domain common-image gathers(ADCIGs)in the elastic reverse time migration(ERTM)of VTI *** start with,we derive an anisotropic-Helmholtz decomposition operator from the Christoffel equation in VTI media,and use this operator to derive the decomposed formulations for anisotropic P/S ***,we employ the first-order Taylor expansion to calculate the normalized term of decomposed formulations and obtain the anisotropic-Helmholtz decomposition method,which generates the separated P/S wavefields with correct amplitudes and ***,we develop a novel way that uses the anisotropic-Helmholtz decomposition operator to define the polari-zation angles for anisotropic P/S waves and substitute these angles to decomposing *** polarization angles are then calculated directly from the separated vector P-and S-wavefields and converted to the phase *** ADCIGs are thusly produced by applying the phase angles to VTI *** addition,we develop a concise approximate expression of residual moveout(RMO)for PP-reflections of flat reflectors in VTI media,which avoids the complex transformations between the group angles and the phase *** approximate RMO curves show a good agreement with the exact solution and can be used as a tool to assess the migration velocity *** demonstrated by two selected examples,our ADCIGs not only produce the correct kinematic responses with regards to different velocity pertubatation,but also generate the reliable amplitude responses versus different *** final stacking images of ADCIGs data exhibit the identical im

关键词： Helmholtz decomposition Angle gathers Anisotropy Elastic-RTM

Trusted Attestation Architecture on an Infrastructure-as-a-Service

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Tsinghua Science and Technology 2017年第5期22卷 469-477页

作者： xin Jin xingshu Chen Cheng zhao Dandan zhao the College of Computer Science Sichuan University

Trusted attestation is the main obstruction preventing large-scale promotion of cloud computing. How to extend a trusted relationship from a single physical node to an Infrastructure-as-a-Service （laaS） platform is a problem that must be solved. The laaS platform provides the Virtual Machine （VM）, and the Trusted VM, equipped with a virtual Trusted Platform Module （vTPM）, is the foundation of the trusted laaS platform. We propose a multi-dimensional trusted attestation architecture that can collect and verify trusted attestation information from the computing nodes, and manage the information centrally on a cloud management platform. The architecture verifies the laaS＇s trusted attestation by apprising the VM, Hypervisor, and host Operating System＇s （OS） trusted status. The theory and the technology roadmap were introduced, and the key technologies were analyzed. The key technologies include dynamic measurement of the Hypervisor at the process level, the protection of vTPM instances, the reinforcement of Hypervisor security, and the verification of the laaS trusted attestation. A prototype was deployed to verify the feasibility of the system. The advantages of the prototype system were compared with the Open CIT （Intel Cloud attestation solution）. A performance analysis experiment was performed on computing nodes and the results show that the performance loss is within an acceptable range.

关键词： dynamic measurement trusted cloud vTPM trusted attestation

Highly active N-doped carbon encapsulated Pd-Fe intermetallic nanoparticles for the oxygen reduction reaction

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Nano Research 2020年第9期13卷 2365-2370页

作者： Yezhou Hu Yun Lu Xueru zhao Tao Shen Tonghui zhao Mingxing Gong ke Chen Chenglong Lai Jian Zhang Huolin L.xin Deli Wang key laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of New-Energy Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China Department of Physics and Astronomy University of CaliforniaIrvineIrvineCA 92697USA

Developing highly efficient non-R catalysts for fuel cells and metal-air batteries is highly desirable but still challenging due to the sluggish oxygen reduction reaction(ORR).Herein,a facile and efficient strategy is demonstrated to prepare N-doped carbon encapsulated ordered Pd-Fe intermetallic(O-Pd-Fe@NC/C)nanoparticles via a one-step thermal annealing *** obtained O-Pd-Fe@NC/C nanoparticles show enhanced ORR activity,durability and anti-poisoning capacity in both acid and alkaline *** O-Pd-Fe@NC/C serving as cathode catalyst for Zn-air battery,it exhibits higher voltage platform and superior cycling performance with respect to the Zn-air battery based on the mixture of Pt/C and Ir/C *** enhanced electrocatalytic performance can be ascribed to the formation of face-centered tetragonal(fct)Pd-Fe nanoparticles,the protective action of the N-doped carbon layer and the interface confinement effect between *** in situ formed N-doped carbon shell not only restrains the Pd-Fe ordered intermetallics from aggregating effectively during the thermal annealing process,but also provides a strong anchoring effect to avoid the detachment of Pd-Fe nanoparticles from the carbon support during the potential *** facile carbon encapsulation strategy may also be extended to the preparation of a wide variety of N-doped carbon encapsulated intermetallic compounds for fuel cell application.

关键词： palladium carbon encapsulation strategy ordered intermetallic nanoparticles oxygen reduction reaction(ORR) Zn-air battery

Stability range of tilted dendritic arrays during directional solidification

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Science China(Technological Sciences) 2014年第12期57卷 2530-2535页

作者： xinG Hui zhao Xiao Bin DUAN Pei Pei CHEN Chang Le CHEN Zhi JIN ke xin key Laboratory of Space Applied Physics and Chemistry Shaanxi Key Laboratory for Condensed Matter Structure and Properties Northwestern Polytechnical University

The stability range of primary spacing of the tilted dendritic arrays in directional solidification has been studied by quantitative phase-field simulations. Results show that both the real growth direction and morphological shapes of dendritic arrays change with the primary spacing for different misorientation angles(θ0). It has been found that the lower limit of primary spacing is independent of θ0, but the upper limit of primary spacing is strongly influenced by that. The two kinds of tertiary branching instabilities result in different behaviors of the variation of the upper limit with misorientation angle for different pulling velocities.

关键词： directional solidification stability range titled growth phase-field model