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Asymmetric orbital hybridization in Zn-doped antiperovskite Cu_(1-x)Zn_(x)NMn_(3)enables highly efficient electrocatalytic hydrogen production

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Journal of Energy Chemistry 2024年第2期89卷 304-312,I0008页

作者： Yuxiang Yan Yuxin Cao Zhichao Wang ka Wang Hengdong ren Shaoqi Zhang Yi Wang Jian Chen Yong Zhou Lizhe Liu Jun Dai Xinglong Wu National Laboratory of Solid States Microstructures and School of Physics Nanjing UniversityNanjing 210093JiangsuChina College of Engineering and Applied Sciences Nanjing UniversityNanjing 210093JiangsuChina National Laboratory of Solid States Microstructures and research Institute of Superconductor Electronics Nanjing UniversityNanjing 210093JiangsuChina School of mathematics&Physics Jiangsu University Science&TechnologyZhenjiang 212003JiangsuChina

rational design of efficient and robust earth-abundant alkaline hydrogen evolution reaction(HEr)catalysts is a key factor for developing energy conversion ***,antiperovskite nitride CuNMn_(3)has garnered significant interest due to its remarkable properties such as negative/zero thermal expansion and magnetocaloric ***,when utilized as hydrogen evolution catalysts,it encounters large challenge resulting from excessively strong/weak interactions with adsorbed H on Mn/Cu active sites,which leads to low HEr *** this study,we introduce an asymmetric orbital hybridization strategy in Zn-doped Cu_(1-x)Zn_(x)NMn_(3)by leveraging the localization of Zn electronic states to reconfigure the electronic structures of Cu and Mn,thereby reducing the energy barrier for water dissociation and optimizing Cu and Mn active sites for hydrogen adsorption and H_(2)*** evaluations reveal that Cu_(0.85)Zn_(0.15)NMn_(3)with x=0.15 demonstrates exceptional electrocatalytic activity in alkaline electrolytes.A low overpotential of 52 mV at 10 ma cm^(-2)and outstanding stability over a 150-h test period are achieved,surpassing commercial Pt/*** research offers a novel strategy for enhancing HEr performance by modulating asymmetric hybridization of electron orbitals between multiple metal atoms within a material structure.

关键词： Cu_(1-x)ZnxNMn_(3) Asymmetric orbital hybridization Hydrogen adsorption Hydrogen production

Adaptive coupled-sliding-variable-based finite-time control of composite formation for multi-robot systems

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Science China(Information Sciences) 2024年第10期67卷 244-260页

作者： Xinru ma Hengyu LI Jun LIU Yueying WANG Shaorong XIE Jun LUO School of Mechatronic Engineering and Automation Shanghai University School of mathematics and Computer Application Technology Jining University School of Computer Science Shanghai University College of Mechanical and Vehicle Engineering Chongqing University

This paper focuses on the finite-time control(FTC) of the composite formation consensus(CFC)problems for multi-robot systems(MrSs). The CFC problems are firstly proposed for MrSs under the complex network topology of cooperative or cooperative-competitive networks. regarding the problems of FTC and CFC on multiple Lagrange systems(MLSs), coupled sliding variables are introduced to deal with the robustness and consistent convergence. Then, the adaptive finite-time protocols are given based on the displacement approaches. With the premised FTC, tender-tracking methods are further developed for the problems of tracking information disparity. Stability analyses of those MLSs mentioned above are clarified with Lyapunov candidates considering the coupled sliding vectors, which provide new verification for tender-tracking systems. Under the given coupled-sliding-variable-based finite-time protocols, MLSs distributively adjust the local formation error to achieve global CFC and perform uniform convergence in time-varying tracking. Finally, simulation experiments are conducted while providing practical solutions for the theoretical results.

关键词： composite formation time-vary tracking information disparity tender-tracking finite-time control nonlinear robots complex networks symmetry consensus

Q-Learning-Assisted Meta-Heuristics for Scheduling Distributed Hybrid Flow Shop Problems

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Computers, materials & Continua 2024年第9期80卷 3573-3589页

作者： Qianyao Zhu kaizhou Gao Wuze Huang Zhenfang ma Adam Slowik Institute of Systems Engineering Macao University of Science and TechnologyMacao99078China Department of Electronics and Computer Science Koszalin University of TechnologyKoszalin75-453Poland

The flow shop scheduling problem is important for the manufacturing *** flow shop scheduling can bring great benefits to the ***,there are few types of research on Distributed Hybrid Flow Shop Problems(DHFSP)by learning assisted *** work addresses a DHFSP with minimizing the maximum completion time(makespan).First,a mathematical model is developed for the concerned ***,four Q-learning-assisted meta-heuristics,e.g.,genetic algorithm(GA),artificial bee colony algorithm(ABC),particle swarm optimization(PSO),and differential evolution(DE),are *** to the nature of DHFSP,six local search operations are designed for finding high-quality solutions in local *** of randomselection,Q-learning assists meta-heuristics in choosing the appropriate local search operations during ***,based on 60 cases,comprehensive numerical experiments are conducted to assess the effectiveness of the proposed *** experimental results and discussions prove that using Q-learning to select appropriate local search operations is more effective than the random *** verify the competitiveness of the Q-learning assistedmeta-heuristics,they are compared with the improved iterated greedy algorithm(IIG),which is also for solving *** Friedman test is executed on the results by five *** is concluded that the performance of four Q-learning-assisted meta-heuristics are better than IIG,and the Q-learning-assisted PSO shows the best competitiveness.

关键词： Distributed scheduling hybrid flow shop meta-heuristics local search Q-learning

MEC网络中基于深度确定策略梯度的能效优化

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火力与指挥控制 2024年第7期49卷 44-49页

作者：陈卡驻马店职业技术学院河南驻马店463000

移动边缘计算(mobile edge computing,MEC)技术能为用户提供数据处理服务,但MEC服务器的计算资源有限,用户合理地向MEC服务器迁移任务及MEC服务器基于任务要求给用户合理分配资源是提高用户端能效的关键因素。提出基于深度确定策略梯度... 详细信息

移动边缘计算(mobile edge computing,MEC)技术能为用户提供数据处理服务,但MEC服务器的计算资源有限,用户合理地向MEC服务器迁移任务及MEC服务器基于任务要求给用户合理分配资源是提高用户端能效的关键因素。提出基于深度确定策略梯度的能效优化算法(deep deterministic policy gradient-based energy efficiency opti-mization,DDPG-EEO)。在满足时延要求的前提下,建立关于任务卸载率和资源分配策略的最大化能效的优化问题。再将优化问题描述成马尔可夫决策过程(markov decision process,MDP),并利用深度确定策略梯度求解。仿真结果表明,DDPG-EEO算法降低了UTs端的能耗,并提高了任务完成率。

关键词：移动边缘计算任务卸载资源分配强化学习深度确定策略梯度

Evolution of Mother-to-Child HIV-1 Transmission rate in mali from 2009 to 2018

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Advances in Microbiology 2024年第5期14卷 256-267页

作者： Alou Sanogo Mohamed Ag Baraïka maïga Aminata Demba Koita mahamadou Abdou mamadou Guindo Clémentine N’Diaye Fatoumata Namoudou Traoré Abdoulaye Bagayoko Youssouf Diallo Flabou Bougoudogo Ibrehima Guindo National Institute for Public Health Bamako Mali Faculty of Pharmacy (FAPH) University of Science of Technical and Technology de Bamako Bamako Mali University Hospital Center (CHU)-Point G Bamako Mali Faculty of Medecine and Odonto-Stomatology University of Science of Technical and Technology de Bamako Bamako Mali Sector Unit for the Fight against AIDS Tuberculosis and Hepatitis Bamako Mali UNICEF (United Nations Children’ s Fund) Bamako Mali

Despite enormous efforts to achieve the goal of eliminating mother-to-child transmission of HIV-1, it remains a major challenge for many countries in sub-Saharan Africa, particularly mali. Our objective is to assess changes in the rate of mother-to-child transmission of HIV-1. We conducted a cross-sectional study between January 1, 2009 to December 31, 2018 (10 years) of early diagnosis activity in newborns and children born to HIV-1-positive mothers at the National Institute for Public Health (INSP). The samples came from health and referral centers in mali. All samples were received at the Laboratory of Molecular Biology at the INSP. Proviral DNA extraction was performed from a blood spot sample with a roche DNA kit, Cobas AmpliPrep/Cobas Taqman HIV-1 qualitative Test, V2.0 (roche Molecular System, Inc, USA) following the company procedures. Molecular diagnosis was performed using the same kits using an algorithm of three identical PCrs. The Epi Info version 7 software was used for data analysis with a significance threshold of 5%. A total of 10,714 samples of infants and children born to HIV-positive mothers were analyzed by PCr. Ninety-six percent of mothers were on ArV prophylaxis (AZT 3TC NVP and AZT NVP) and 60% of newborns received the same ArV prophylaxis. Of these children, 956 tested positive with an overall transmission rate of 8.92%, varying between 7.27% in 2009 and 08.01% in 2018. This rate was relatively low among children receiving prophylaxis at 2.04% and remained high for children who received breastfeeding at 5.62%. However, the transmission rate remains low for those who have benefited from mixed and artificial breastfeeding at 1.58% and 1.27% respectively. A significant proportion of children remained infected by their mothers during pregnancy, childbirth or breastfeeding. This study shows the importance of early diagnosis of HIV in children using molecular technology.

关键词： Early Diagnosis Mothers-to-Child Newborns PCr DNA HIV-1

ka-band thin film lithium niobate photonic integrated optoelectronic oscillator

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Photonics research 2024年第6期12卷 1283-1293页

作者： rUI ma ZIJUN HUANG SHENGQIAN GAO JINGYI WANG XICHEN WANG XIAN ZHANG PENG HAO X.STEVE YAO XINLUN CAI State Key Laboratory of Optoelectronic materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Photonics Information Innovation Center and Hebei Provincial Center for Optical Sensing College of Physics Science and TechnologyHebei UniversityBaoding 071002China NuVison Photonics Inc.Las VegasNevada 89109USA

Photonics integration of an optoelectronic oscillator(OEO)on a chip is attractive for fabricating low cost,compact,low power consumption,and highly reliable microwave sources,which has been demonstrated recently in silicon on insulator(SOI)and indium phosphide(InP)platforms at X-band around 8 *** we demonstrate the first integration of OEOs on the thin film lithium niobate(TFLN)platform,which has the advantages of lower Vπ,no chirp,wider frequency range,and less sensitivity to *** have successfully realized two different OEOs operating at ka-band,with phase noises even lower than those of the X-band OEOs on SOI and InP *** is a fixed frequency OEO at 30 GHz realized by integrating a mach–Zehnder modulator(MZM)with an add-drop microring resonator(Mrr),and the other is a tunable frequency OEO at 20–35 GHz realized by integrating a phase modulator(PM)with a notch *** work marks the first step of using TFLN to fabricate integrated OEOs with high frequency,small size,low cost,wide range tunability,and potentially low phase noise.

关键词： optoelectronic modulator resonator

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高职院校课程思政评估体系构建路径

大学（思政教研） 2024年第9期 129-132页

作者：卡米来马彩梅新疆石河子职业技术学院新疆石河子832099

为了进一步贯彻落实立德树人要求,高职院校须重视课程思政评估体系建设工作,通过健全课程思政评估体系和流程,有效提升课程思政教学质量,将课程思政和专业课教学有机衔接。文章首先简要分析了高职院校构建课程思政评价指标体系的意义、... 详细信息

为了进一步贯彻落实立德树人要求,高职院校须重视课程思政评估体系建设工作,通过健全课程思政评估体系和流程,有效提升课程思政教学质量,将课程思政和专业课教学有机衔接。文章首先简要分析了高职院校构建课程思政评价指标体系的意义、构建依据以及原则,其次重点阐述了高职院校课程思政评估体系建设路径,以期为推动高职院校可持续发展提供参考。

关键词：高职院校课程思政质量评价建设路径

A registry-Based Observational Study on the maternal and Fetal Outcomes of COVID-19 Patients in Hong Kong,China

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maternal-Fetal Medicine 2024年第3期6卷 156-163页

作者： Hillary HY Leung Teresa WL ma Florrie NY Yu Meliza CW Kong Tsz Kin Lo Pauline PL So Wing-Cheong Leung Wendy Shu ka Wang Cheung Sakita Moungmaithong Chi Chiu Wang Liona C.Poon Department of Obstetrics and Gynaecology The Chinese University of HongKongHong Kong 999077China Department of Obstetrics and Gynaecology Queen Elizabeth HospitalHong Kong 999077China Department of Obstetrics and Gynaecology United Christian HospitalHong Kong 999077China Department of Obstetrics and Gynaecology Princess Margaret HospitalHong Kong 999077China Department of Obstetrics and Gynaecology Tuen Mun HospitalHong Kong 999077China Department of Obstetrics and Gynaecology Kwong Wah HospitalHong Kong 999077China Department of Obstetrics and Gynaecology Pamela Youde Nethersole Eastern HospitalHong Kong 999077China Department of Obstetrics and Gynaecology Queen Mary HospitalHong Kong 999077China

Objective:To report the clinical maternal and fetal outcomes of pregnant women with coronavirus disease 2019(COVID-19),along with any associated pregnancy complications,in Hong Kong,China,and to assess the impact of COVID-19 vaccination on these ***:This prospective registry-based observational study included pregnant women who were recruited through convenient sampling and had a laboratory-confirmed severe acute respiratory syndrome coronavirus 2 infection with a cycle threshold(Ct)value result available on admission to eight local hospitals in Hong Kong,*** on clinical symptoms,laboratory results,medical treatments,delivery timing and mode,and pregnancy complications were extracted from the Hospital Authority’s electronic medical record ***,fetal,and pregnancy outcomes were compared between unvaccinated pregnant women with COVID-19 and those who had received at least one dose of COVID-19 vaccine before *** continuous variables and categorical variables were analyzed using the mann-Whitney U test and the Pearson’s chi-squared test respectively.A P value less than 0.05 was considered statistically ***:A total of 164 pregnant women were included,of whom 78(47.56%)were ***-19 was diagnosed before 28 weeks’gestation in 30(18.29%),while 134(81.71%)were diagnosed at or after 28 weeks’***-two(37.80%)women received at least one dose of COVID-19 *** were no significant differences between vaccinated and unvaccinated groups in the time interval between COVID-19 diagnosis and delivery,the Ct value,and the gestational age at infection onset or delivery(P>0.05).The majority of women were symptomatic at diagnosis regardless of vaccination status 55(88.71%)in vaccinated group vs.78(76.47%)in unvaccinated group(P=0.052).Symptoms did not significantly differ between groups except for cough(62.90%vs.47.06%,P=0.049).The overall rate of severe COVID-19 in pregnant women was *** t

关键词： COVID-19 maternal outcomes Fetal outcomes Pregnancy complications Severe COVID-19

用于微波热疗的小型化开缝微带贴片和金属腔复合天线

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真空电子技术 2024年第2期 33-39页

作者：胡琨肖麒黄卡玛四川大学电子信息学院四川成都610065

传统的治疗癌症方法往往会产生严重的副作用。作为一种微创、高效、低毒的绿色治疗方法,近年来微波热疗受到越来越多人的青睐。本研究的重点是设计和评估用于热疗的工作频率为2450 MHz的微型开缝贴片天线。天线贴片呈八角形,包含4个对称... 详细信息

传统的治疗癌症方法往往会产生严重的副作用。作为一种微创、高效、低毒的绿色治疗方法,近年来微波热疗受到越来越多人的青睐。本研究的重点是设计和评估用于热疗的工作频率为2450 MHz的微型开缝贴片天线。天线贴片呈八角形,包含4个对称槽,以减小尺寸并改善定向辐射。天线与组织之间增加了一个开放式金属腔,以保持预设距离,防止贴片直接接触皮肤,实现更好的阻抗匹配,减少对周围区域的能量辐射。根据比吸收率(SAr)、穿透深度(PD)和有效场强(EFS)对天线的性能进行评估,加工制作了天线并在猪肉组织中进行了测试,测量结果与模拟结果非常吻合。

关键词：小型化八边形贴片金属腔微波热疗比吸收率