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Optimality Conditions for Rank-Constrained Matrix Optimization

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Journal of the Operations Research Society of China 2019年第2期7卷 285-301页

作者： xin-Rong Li Wen Song Nai-Hua xiu Department of Applied Mathematics Beijing Jiaotong UniversityBeijing 100044China School of Mathematical Sciences Harbin Normal UniversityHarbin 150025China

In this paper,we comprehensively study optimality conditions for rank-constrained matrix optimization(RCMO).By calculating the Clarke tangent and normal cones to a rank-constrained set,along with the given Fréchet,Mordukhovich normal cones,we investigate four kinds of stationary points of the RCMO and analyze the relations between each stationary point and local/global minimizer of the ***,the second-order optimality condition of the RCMO is achieved with the help of the Clarke tangent cone.

关键词： Matrix optimization Rank constraint Normal cone First-order optimality condition Second-order optimality condition

Expression of Sex-Related Genes in Chicken Embryos During Male-to-Female Sex Reversal Exposure to Diethylstilbestrol

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Journal of Integrative Agriculture 2013年第1期12卷 127-135页

作者： FANG Li-xiu xin Rui CHE Yi XU Shi-qing Department of Applied Biology Medical College Soochow University

Sex emerges out of a delicate dance between a variety of promale, anti-male, and possibly profemale genes. To investigate the role that sex-related genes play in sex determination and gonadal differentiation of fowl, we constructed a male-to- female sex-reversal model of chick induced by diethylstilbestrol （DES） at onset of incubation （E0）. The results of semi- quantitative PCR showed that the expression of Sf1, the orphan nuclear receptor steroidogenic factor-1 gene, was put forward from E7d to E5d and up-regulated during E5-7d; the Dmrt1, the double sex and the Mab-3 related to transcription factor 1 gene, was down-regulated during E3-7d. Meanwhile, anti-Müllerian hormone gene （Amh） expressed at a similar level in the genetic females and sex-reversal females before E7d, while no expression products of the three female-specific genes Wpkci, Fet1 and Foxl2 were detected in male-to-female embryos. These findings suggest that the expression of some certain sex-related genes, induced by the exogenous estrogen during period of sex determination and gonadal differentiation, results in the male-to-female sex reversal. Moreover, high activity of Sf1 gene during E5-7d might be related to the profemale process, while low activity of Dmrt1 gene during E3-5d might be anti-male. The expression activity of Amh gene might only contribute to the promale process after E7d, however, it is possibly not an anti-female gene in chick embryos.

关键词： sex reversal diethylstilbestrol chicken sex determination sexual differentiation sex-related gene

Two New Bisabolane Sesquiterpenes from Leontopodium longifolium

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Chinese Chemical Letters 2006年第6期17卷 776-778页

作者： Ji xin LI xiu Ping YANG Zhong Jian JIA State Key Laboratory of Applied Organic Chemistry College of Chemistry and Engineering Lanzhou University Lanzhou 730000

Two new bisabolane sesquiterpenes were isolated from the roots of Leontoptdium longifolium. Their structures were elucidated as 4α, 5α-diacetoxy-lα-angeloyloxybisabol-2, 9, ll-triene and 4α, 5α-diacetoxy-lα-ange... 详细信息

关键词： Leontopodium longifolium Compositae bisabolane sesquiterpene.

Energy return on investment, energy payback time, and greenhouse gas emissions of coal seam gas(CSG) production in China: a case of the Fanzhuang CSG project

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Petroleum Science 2018年第1期15卷 185-199页

作者： Zhao-Yang Kong xiu-Cheng Dong Xi Lu xin Wan School of Business Administration China University of Petroleum (Beijing) School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University School of Economics and Management Beijing University of Chemical Technology

The studies and development of coal seam gas（CSG） have been conducted for more than 30 years in China, but few of China＇s CSG projects have achieved large-scale commercial success; faced with the boom of shale gas, some investors are beginning to lose patience and confidence in CSG. China currently faces the following question： Should the government continue to vigorously support the development of the CSG industry？ To provide a reference for policy makers and investors, this paper calculates the EROI_（stnd）[a standardized energy return on investment（EROI） method], EROI_（ide）（the maximum theoretical EROI）, EROI_（3,i）（EROI considering the energy investment in transport）, and EROI_（3,1＋e）（EROI with environmental inputs） of a single vertical CSG well in the Fanzhuang CSG project in the Qinshui Basin. The energy payback time（EPT） and the greenhouse gas（GHG） emissions of the CSG systems are also calculated. The results show that over a 15-year lifetime, EROI_（stnd）, EROI_（ide）, EROI_（3,1）, and EROI_（3,1＋e）are expected to deliver EROIs of approximately11：1, 20：1, 7：1, and 6：1, respectively. The EPT within different boundaries is no more than 2 years, and the life-cycle GHG emissions are approximately 18.8 million kg CO_2 equivalent. The relatively high EROI and short EPT indicate that the government should take more positive measures to promote the development of the CSG industry.

关键词： Coal seam gas EROI Energy payback time Greenhouse gas emissions Global warming potential China

Activity regulation and applications of metal-organic framework-based nanozymes

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Rare Metals 2024年第3期43卷 900-914页

作者： Ge Fang Shou-xin Bao Gen-xiu Zhou Cui-Cui Ge State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSchool for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China Suzhou Nanomicro Technology Co. LtdSuzhou 215000China

As a new generation of artificial enzymes,nanozymes show outstanding advantages such as high stability,low cost,and facile synthesis,which endow them with promising applications in biomedical and environmental *** the various reported nanozymes,metal-organic frameworks(MOFs)could mimic the active center of natural enzymes and provide a hydrophobic environment,which makes MOFs attractive alternatives to natural *** to the highly structural diversity and tailorability of MOFs,rational design will contribute to improve the activity of MOF-based nanozymes and promote their potential applications in both biomedical and environmental ***,a comprehensiye suminary of activity regulatory strategies of MOF-based nanozymes is urgently ***,we summarized the activity regulatory strategies of MOFs with intrinsic enzyme-like activities via modulation of metal nodes,ligands,structures and *** the applications of MOF-based nanozymes in biosensing,hazardous degradation,antibacterial,and cancer therapy were also ***,the current challenges and future perspectives were discussed in *** is highly expected that this review will provide a better understanding on the rational design of novel high-performance MOF-based nanozymes.

关键词： Metal-organic frameworks(MOF)-based nanozymes Activity regulation Biosensing Cancer therapy Hazardous degradation Antibacterial

Experimental Study on Wear Performance and Oil Film Characteristics of Surface Textured Cylinder Liner in Marine Diesel Engine

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Chinese Journal of Mechanical Engineering 2018年第3期31卷 158-167页

作者： Zhi-Wei Guo Cheng-Qing Yuan xiu-Qin Bai xin-Ping Yan Reliability Engineering Institute National Engineering Research Center for Water Transportation Safety Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of Technology

It is of a vital importance to reduce the frictional losses in marine diesel engines. Advanced surface textures have provided an e ective solution to friction performance of rubbing pairs due to the rapid development of surface engineering techniques. However,the mechanisms through which textured patterns and texturing methods prove beneficial remains unclear. To address this issue,the tribological system of the cylinder liner?piston ring(CLPR) is investigated in this work. Two types of surface textures(Micro concave,Micro V?groove) are processed on the cylinder specimen using di erent processing methods. Comparative study on the friction coe cients,worn surface texture features and oil film characteristics are performed. The results demonstrate that the processing method of surface texture a ect the performance of the CLPR pairs under the specific testing conditions. In addition the micro V?groove processed by CNCPM is more favorable for improving the wear performances at the low load,while the micro?con?cave processed by CE is more favorable for improving the wear performances at the high load. These findings are in helping to understand the e ect of surface texture on wear performance of CLPR.

关键词： Cylinder liner?piston ring(CLPR) Surface texture structure Frictional and wear characteristic Oil film characteristic

Genetic effects of Agropyron cristatum 2P chromosome translocation fragments in a wheat background

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Journal of Integrative Agriculture 2023年第1期22卷 52-62页

作者： XU Shi-rui JIANG Bo HAN Hai-ming JI Xia-jie ZHANG Jin-peng ZHOU Sheng-hui YANG xin-ming LI xiu-quan LI Li-hui LIU Wei-hua National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081P.R.China Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130P.R.China

Agropyron cristatum(2n=4x=28,PPPP)is a wild relative of common wheat which contains a large number of desirable genes that can be exploited for wheat ***–*** 2P alien translocation lines exhibit many desirable traits,such as small flag leaves,a high spikelet number and density,and a compact plant *** agronomic trait evaluation and a genetic analysis were carried out on translocation lines and backcross populations of these lines carrying different translocation *** results showed that a translocation fragment from 2PT-3(2PL)reduced the length of the flag leaves,while translocation fragments from 2PT-3(2PL)and 2PT-5(2PL(0.60–1.00))reduced the width of the flag leaves.A translocation fragment from 2PT-13(2PS(0.18–0.36))increased the length and area of the flag *** fragments from 2PT-3(2PL)and 2PT-8(2PL(0.86–1.00))increased the density of *** fragments from 2PT-7(2PL(0.00–0.09)),2PT-8(2PL(0.86–1.00)),2PT-10(2PS),and 2PT-13(2PS(0.18–0.36))reduced plant *** study provides a scientific basis for the effective utilization of wheat–*** translocation lines.

关键词： wheat-A.cristatum 2P chromosome translocation lines flag leaf spikelet density genetic effects

A secure rational quantum state sharing protocol

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Science China(Information Sciences) 2018年第2期61卷 204-215页

作者： Zhao DOU Gang XU xiu-Bo CHEN xin LIU Yi-Xian YANG Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications School of Software Engineering Beijing University of Posts and Telecommunications School of Information Engineering Inner Mongolia University of Science and Technology School of Computer Science Shaanxi Normal University Gui Zhou University Guizhou Provincial Key Laboratory of Public Big Data

A novel rational protocol to share two arbitrary qubits among multiple parties is investigated in this paper. First, the protocol is presented, which is learned from Li et al.’s protocol. Second, the utility,security, correctness, fairness, Nash equilibrium, and Pareto optimality of our scheme are discussed in detail,where the utility, correctness, and fairness of rational quantum state sharing protocols are creatively given because the agent who recovers the state plays a different and more important role. Another important point is that assumptions about our protocol are more practical and suitable than existing protocols.

关键词： rational quantum state sharing Nash equilibrium secure correct

Acidity-Driven Bidirectional Room-Temperature Spin-State Switch and Fluorescence Modulation of a Mononuclear Fe(II) Complex

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CCS Chemistry 2021年第8期3卷 2350-2358页

作者： Yi-Shan Ye xiu-Qin Chen Kai-Yan Shen ming-Liang Tong xin Bao School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094 School of Chemistry Sun Yat-Sen UniversityGuangzhou 510275

Room-temperature switchable materials showing multiple responses toward external stimuli are highly ***,we report bidirectional spin-state switch and fluorescence modulation of an Fe(II)complex(1)based on a rhodamine B 2-pyridinecarbaldehyde hydrazone ligand in both the solid state and *** complex is predominantly stabilized in the low-spin(LS)state at room temperature due to the strong ligand-field strength imposed by acylhydrazone pyridine.

关键词： room-temperature switch spin-state change fluorescence modulation Fe(II)complex labile coordination sphere