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A Modified Bi-Directional Evolutionary Structural Optimization Procedure with Variable Evolutionary Volume Ratio Applied to Multi-Objective Topology Optimization Problem

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Computer Modeling in Engineering & Sciences 2023年第4期135卷 511-526页

作者： Xudong Jiang jiaqi ma Xiaoyan Teng School of Mechanical and Power Engineering Harbin University of Science and TechnologyHarbin150080China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin150001China

Natural frequency and dynamic stiffness under transient loading are two key performances for structural design related to automotive,aviation and construction *** article aims to tackle the multi-objective topological optimization problem considering dynamic stiffness and natural frequency using modified version of bi-directional evolutionary structural optimization(BESO).The conventional BESO is provided with constant evolutionary volume ratio(EVR),whereas low EVR greatly retards the optimization process and high EVR improperly removes the efficient *** address the issue,the modified BESO with variable EVR is *** compromise the natural frequency and the dynamic stiffness,a weighting scheme of sensitivity numbers is employed to form the Pareto solution *** numerical examples demonstrate that the optimal solutions obtained from the modified BESO method have good agreement with those from the classic BESO *** importantly,the dynamic removal strategy with the variable EVR sharply springs up the optimization ***,it is concluded that the modified BESO method with variable EVR can solve structural design problems using multi-objective optimization.

关键词： Bi-directional evolutionary structural optimization variable evolutionary volume ratio multi-objective optimization weighted sum topology optimization

Giant enhancement of photoluminescence quantum yield in 2D perovskite thin microplates by graphene encapsulation

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Nano Research 2021年第6期14卷 1980-1984页

作者： Wancai Li jiaqi ma Xue Cheng Dehui Li School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

The optoelectronic performances of the layered materials are strongly dependent on the thickness of the samples due to the surface *** the size of the samples decreases to few nanometers,the surface depletion field and surface defect density are prominent arising from the large surface to volume *** instance,thin two-dimensional(2D)organic-inorganic hybrid perovskite microplates usually exhibit a rather low photoluminescence quantum yield(PLQY),owning to the strong surface ***,we report that the PLQY can be enhanced as large as 28 times in(iso-BA)2Pbl4(BA=C4H9NH3)2D perovskite thin microplates encapsulated by graphene,resulting in that the PLQY is more than 18%for the microplate with a thickness of 6.7 nm at 78 *** the thickness of the 2D perovskite microplate increases,the enhancement is gradually reduced and finally *** observation is in striking contrast to that in monolayer transition metal dichalcogenides(TMDs),when the PLQY is quenched by covering a layer of graphene due to the efficient charge *** enhancement of PLQY in 2D perovskites can be mainly ascribed to the reduced quantum confined Stark effect(QCSE)due to the reduced surface depletion field after covering graphene flake,resulting in the enhanced radiative recombination *** findings provide a cost-effective approach to enhance the luminescence,which may pave the way toward high performance light emitting devices based on 2D perovskites.

关键词： two-dimensional perovskite photoluminescence quantum yield quantum confinement surface depletion field

Application of Blockchain in Trusted Digital Vaccination Certificates

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China CDC weekly 2022年第6期4卷 106-110页

作者： Zixiong Zhao jiaqi ma Chinese Centre for Disease Control and Prevention BeijingChina

With the increasing number of coronavirus disease 2019(COVID-19)cases and worldwide vaccination coverage,‘vaccination passports’(vaccination certificates)may become a required permit for global travel,thereby supporting economic *** march 7,2021,Wang Yi,State Councilor and Foreign Minister of China,announced the launch of the Chinese version of an‘international travel health certificate’at a press conference of the National People’s Congress and the Chinese Political Consultative *** proposed a feasible‘Chinese solution’for promoting the recovery of the global economy and the facilitation of cross-border travel,and hoped that the international travel health certificate and vaccination passport can be mutually authenticated.

关键词： travel thereby mutually

Estimating the Incidence of Tuberculosis--Shanghai,China,2025−2050

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China CDC weekly 2020年第52期2卷 995-998页

作者： Shegen Yu jiaqi ma Zhongwei Jia School of Public Health Peking UniversityBeijingChina Chinese Center for Disease Control and Prevention BeijingChina Center for Intelligent Public Health Institute for Artificial IntelligencePeking UniversityBeijingChina Center for Drug Abuse Control and Prevention National Institute of Health Data SciencePeking UniversityBeijingChina

What is already known on this topic?Despite the impressive achievements in eliminating tuberculosis(TB),the TB burden is still heavy in *** 2010,China halved the prevalence and mortality reported in 1990,but China is still one of 30 high-TB burden countries in the *** is added by this report?A dynamic transmission model including both rifampin resistant TB(RR-TB)and relapse of pulmonary TB was *** TB incidence of Shanghai in 2025 and 2035 was predicted,and sensitively analysis of reducing transmission,treating latent TB infection(LTBI),and reducing the recurrence rate was *** are the implications for public health practice?Screening for latent TB infections should be carried out regularly in high-risk groups and areas using tuberculin skin testing and/or interferon gamma release assays.

关键词： mortality latent eliminating

Social Radars: Finding Targets in Cyberspace for Cybersecurity

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 279-282页

作者： Lili Fan Changxian Zeng Yutong Wang jiaqi ma Fei-Yue Wang School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China School of Science Dalian Minzu UniversityDalian 116600China State Key Laboratory for management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90024 USA IEEE State Key Laboratory for management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China

INSPIRED by the insight from American political scientist Lasswell, who summarized the environmental role in societal surveillance [1], Schramm coined the term “social radar” [2] as it resembles the activities of radar in collecting and processing information, playing a crucial role in helping humans perceive changes in the internal and external environment and promptly adjusting adaptive behaviors.

关键词： prompt summarized insight

Internet Data for Improving Prevention and Control of Global Infectious Diseases

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China CDC weekly 2020年第52期2卷 1009-1012页

作者： Zhongwei Jia Xiangyu Yan Yongjie Li jiaqi ma School of Public Health Peking UniversityBeijingChina Center for Intelligent Public Health Institute for Artificial IntelligencePeking UniversityBeijingChina Center for Drug Abuse Control and Prevention National Institute of Health Data SciencePeking UniversityBeijingChina Chinese Center for Disease Control and Prevention BeijingChina

By the end of 2018,there were about 5.1 billion internet users worldwide who accounted for 67%of the total population(1).Health problems have emerged following widespread use of the internet as a new model of social activity,such as anonymous personal attacks or abuse and information leakages.A more potent threat is the unverified information being provided by the internet or electronic media that can lead to unsubstantiated judgments and improper responses to information regarding an individual’s health status.

关键词： internet Internet individual

Clathrin light chains regulate hypocotyl elongation by affecting the polarization of the auxin transporter PIN3 in Arabidopsis

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Journal of Integrative Plant Biology 2021年第11期63卷 1922-1936页

作者： Tianwei Hu Shoupeng Yin Jingbo Sun Yuting Linghu jiaqi ma Jianwei Pan Chao Wang Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China College of Life Sciences Shaoxing UniversityShaoxing 312000China

PIN-FORMED(PIN)-dependent directional auxin transport is crucial for plant development. Although the redistribution of auxin mediated by the polarization of PIN3 plays key roles in modulating hypocotyl cell expansion, how PIN3 becomes repolarized to the proper sites within hypocotyl cells is poorly understood. We previously generated the clathrin light chain clc2-1 clc3-1 double mutant in Arabidopsis thaliana and found that it has an elongated hypocotyl phenotype compared to the wild type. Here, we performed genetic, cell biology, and pharmacological analyses combined with live-cell imaging to elucidate the molecular mechanism underlying the role of clathrin light chains in hypocotyl elongation. Our analyses indicated that the defects of the double mutant enhanced auxin maxima in epidermal cells, thus, promoting hypocotyl elongation. PIN3 relocated to the lateral sides of hypocotyl endodermal cells in clc2-1 clc3-1 mutants to redirect auxin toward the epidermal cell ***, the loss of function of PIN3 largely suppressed the long hypocotyl phenotype of the clc2-1 clc3-1 double mutant, as did treatment with auxin transport inhibitors. Based on these data, we propose that clathrin modulates PIN3 abundance and polarity to direct auxin flux and inhibit cell elongation in the hypocotyl, providing novel insights into the regulation of hypocotyl elongation.

关键词： Arabidopsis auxin clathrin light chains hypocotyl elongation PIN3

Surface depletion field in 2D perovskite microplates: Structural phase transition, quantum confinement and Stark effect

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Nano Research 2019年第11期12卷 2858-2865页

作者： Wancai Li Chen Fang Haizhen Wang Shuai Wang Junze Li jiaqi ma Jun Wang Hongmei Luo Dehui Li School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China Department of Chemical and materials Engineering New Mexico State UniversityLas CrucesNM88003USA

Surface depletion field would introduce the depletion region near surface and thus could significantly alter the optical,electronic and optoelectronic properties of the materials,especially low-dimensional ***-dimensional(2D)organic—inorganic hybrid perovskites with van der Waals bonds in the out-of-plane direction are expected to have less influence from the surface depletion field;nevertheless,studies on this remain *** we report on how the surface depletion field affects the structural phase transition,quantum confinement and Stark effect in 2D(BA)2PbI4 perovskite microplates by the thickness-,temperature-and power-dependent photoluminescence(PL)*** dependent PL studies suggest that high-temperature phase(HTP)and low-temperature phase(LTP)can coexist in a wider temperature range depending on the thickness of the 2D perovskite *** the decrease of the microplate thickness,the structural phase transition temperature first gradually decreases and then increases below 25 nm,in striking contrast to the conventional size dependent structural phase *** on the thickness evolution of the emission peaks for both high-temperature phase and low-temperature phase,the anomalous size dependent phase transition could probably be ascribed to the surface depletion field and the surface energy difference between *** explanation was further supported by the temperature dependent PL studies of the suspended microplates and encapsulated microplates with graphene and boron nitride *** with the thickness dependent phase transition,the emission energies of free excitons for both HTP and LTP with thickness can be ascribed to the surface depletion induced confinement and Stark effect.

关键词： two-dimensional(2D)perovskite thickness surface depletion field structural phase transition quantum confinement Stark effect

Disproportionate Increase of New Diagnosis of HIV/AIDS Infection by Sex and Age--China, 2007−2018

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China CDC weekly 2020年第5期2卷 69-74页

作者： Yewu Zhang Chang Cai Xiaofeng Wang Yanfei Li Houlin Tang jiaqi ma National Center for Public Health Surveillance and Information Service Chinese Center for Disease Control and PreventionBeijingChina National Center for AIDS/STD Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina.&Joint first authors.

What is already known about this topic?The annual rates of newly diagnosed HIV/AIDS among total population is increasing in China,yet HIV/AIDS in older adults has received little *** is added by this report?The overall rates of new diagnosis of HIV/AIDS per 100,000 populations increased 3.26 and 2.18 times among male and female in all ages from 2007 to 2018,*** adults aged≥60 years,the rate increased 10.41 times(1.35 to 14.06 per 100,000)from 2007 to *** adults aged 60–69 and 70–79 years and female aged 50–59 and 60–69 years had the highest increasing rates among all *** are the implications for public health practice?This study highlights the need to strengthen HIV/AIDS prevention among older *** education and other effective measurements might be used to prevent HIV/AIDS among this group.

关键词： HIV/AIDS prevention diagnosis female