检索结果-南通市图书馆

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang feng Gao Yu-Gui Peng Peng Wu zong-Lin Li Xue-feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

基于一阶差分光谱的海水硝酸盐氮与亚硝酸盐氮测量方法

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2025年第1期45卷 45-51页

作者：梁星辉冯巍巍蔡宗岐王焕卿杨剑炼中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室山东烟台264003 山东省海岸带环境过程重点实验室山东烟台264003 中国科学院大学北京100049

硝酸盐氮与亚硝酸盐氮是海洋水质监测的重点参数,也是研究海洋氮循环的重要参考。紫外吸收光谱法操作简单,响应快速,适用于多种水质参数监测,但测量中硝酸盐氮与亚硝酸盐氮存在混叠干扰以及海水离子干扰。提出了一种硝酸盐氮与亚硝酸盐... 详细信息

硝酸盐氮与亚硝酸盐氮是海洋水质监测的重点参数,也是研究海洋氮循环的重要参考。紫外吸收光谱法操作简单,响应快速,适用于多种水质参数监测,但测量中硝酸盐氮与亚硝酸盐氮存在混叠干扰以及海水离子干扰。提出了一种硝酸盐氮与亚硝酸盐氮快速测量方法,对光谱进行一阶差分等预处理,使用相关系数搜索进行波段优化,使用BP神经网络进行浓度反演,模型的预测值与真实值线性相关系数为0.998。与国外同类设备进行了比对测试,两者线性相关系数为0.982。参加了烟台市海洋环境监测预报中心2023年夏季航次,进行了应用测试,与实验室方法进行了比对分析,两者线性相关系数为0.902,说明本方法能够实现海水硝酸盐氮与亚硝酸盐氮的快速测量,为后续原位监测仪器的研制提供参考。

关键词：硝酸盐氮亚硝酸盐氮紫外吸收光谱一阶差分 BP神经网络

Recent advances in statistical methodologies in evaluating program for high-dimensional data

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2022年第1期37卷 131-146页

作者： ZHAN Ming-feng cai zong-wu FANG Ying LIN Ming Wang Yanan Institute for Studies in Economics and Fujian Key Laboratory of Statistical Sciences Xiamen UniversityXiamen 361005China Department of Economics University of KansasLawrenceKS 66045USA Department of Statistics and Data Science Xiamen UniversityXiamen 361005China

The era of big data brings opportunities and challenges to developing new statistical methods and models to evaluate social programs or economic policies or interventions. This paper provides a comprehensive review on some recent advances in statistical methodologies and models to evaluate programs with high-dimensional data. In particular, four kinds of methods for making valid statistical inferences for treatment effects in high dimensions are addressed. The first one is the so-called doubly robust type estimation, which models the outcome regression and propensity score functions simultaneously. The second one is the covariate balance method to construct the treatment effect estimators. The third one is the sufficient dimension reduction approach for causal inferences. The last one is the machine learning procedure directly or indirectly to make statistical inferences to treatment effect. In such a way, some of these methods and models are closely related to the de-biased Lasso type methods for the regression model with high dimensions in the statistical literature. Finally, some future research topics are also discussed.

关键词： causal inference covariate balance de-biased Lasso dimension reduction doubly robust high dimensions machine learning treatment effect

Synthesis and Antibacterial Activity of New Cephalosporin Compounds

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第10期16卷 1305-1308页

作者： De cai FU feng Ming CHU zong Ru GUO College of Chemical and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang 050018 Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050

Five new cephalosporin compounds were designed and synthesized, and the antibacterial activities were evaluated by the standard serial 2-fold agar dilution method in vitro. The results showed that the activities of th... 详细信息

关键词： Cephalosporin synthesis antibacterial activities.

Understanding the local structure and thermophysical behavior of Mg-La liquid alloys via machine learning potential

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 439-449页

作者： Jia Zhao Taixi feng Guimin Lu National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China Joint International Laboratory for Potassium and Lithium Strategic Resources East China University of Science and TechnologyShanghai 200237China

The local structure and thermophysical behavior of Mg-La liquid alloys were in-depth understood using deep potential molecular dynamic(DPMD) simulation driven via machine learning to promote the development of Mg-La alloys. The robustness of the trained deep potential(DP) model was thoroughly evaluated through several aspects, including root-mean-square errors(RMSEs), energy and force data, and structural information comparison results;the results indicate the carefully trained DP model is reliable. The component and temperature dependence of the local structure in the Mg-La liquid alloy was analyzed. The effect of Mg content in the system on the first coordination shell of the atomic pairs is the same as that of temperature. The pre-peak demonstrated in the structure factor indicates the presence of a medium-range ordered structure in the Mg-La liquid alloy, which is particularly pronounced in the 80at% Mg system and disappears at elevated temperatures. The density, self-diffusion coefficient, and shear viscosity for the Mg-La liquid alloy were predicted via DPMD simulation, the evolution patterns with Mg content and temperature were subsequently discussed, and a database was established accordingly. Finally, the mixing enthalpy and elemental activity of the Mg-La liquid alloy at 1200 K were reliably evaluated,which provides new guidance for related studies.

关键词： magnesium-lanthanum liquid alloys local structure macroscopic properties thermodynamic behavior deep potential mo-lecular dynamic simulation

Design,synthesis and in vitro evaluation of a series thiazolidinediones analogs as PPAR modulators

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第1期18卷 45-47页

作者： Jun feng Ying Lu Zhe feng cai Shi Peng Zhang zong Ru Guo Institute of Materia Medica Chinese Academy of Medical Science and Peking Union Medical College Beijing 100050 China

A series of thiazolidinediones analogs, as PPAR modulators, were designed, synthesized and evaluated in vitro.

关键词： Peroxisome proliferator-activated receptors PPAR modulators Thiazolidinediones

Searching for new drugs to treat Alzheimer’s disease dementia through multiple pathways

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第1期13卷 22-28页

作者： Hua Bai Xiao-feng feng Department of Neurology The Third Affiliated Hospital of Guizhou Medical UniversityDuyun 558099Guizhou ProvinceChina Department of Neurology Wulong Branch of the People's Hospital Affiliated to Chongqing UniversityWulong 408500ChongqingChina Department of Neurology Guizhou Medical UniversityGuiyang 550004Guizhou ProvinceChina

Dementia is a group of diseases,including Alzheimer's disease(AD),vascular dementia,Lewy body dementia,frontotemporal dementia,Parkinson's disease dementia,metabolic dementia and toxic *** treatment of dementia mainly includes symptomatic treatment by controlling the primary disease and accompanying symptoms,nutritional support therapy for repairing nerve cells,psychological auxiliary treatment,and treatment that improves cognitive function through *** them,drug therapy to improve cognitive function is *** review focuses on introducing and commenting on some recent progress in exploring drugs to improve cognitive function,especially the new progress in drug treatment for *** mainly discuss the opportunities and challenges in finding and developing new therapeutic drugs from the aspects of acetylcholinesterase,N-methyl-D-aspartate glutamate receptor,amyloid protein,tau protein and chronic immune inflammation.

关键词： Alzheimer's disease Dementia Cholinesterase inhibitor Beta amyloid Tau protein

Ru doping triggering reconstruction of cobalt phosphide for coupling glycerol electrooxidation with seawater electrolysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 317-326页

作者： Binglu Deng Jie Shen Jinxing Lu Chuqiang Huang Zhuoyuan Chen feng Peng Yunpeng Liu School of Materials Science and Hydrogen Energy Foshan University School of Chemistry and Chemical Engineering Guangzhou University Guangdong Key Laboratory for Hydrogen Energy Technologies

Seawater electrolysis is a promising approach for sustainable energy without relying on precious ***,the large-scale seawater electrolysis is hindered by low catalytic efficiency and severe anode corrosion caused by the harmful *** contrast to the oxygen evolution reaction （OER）and chlorin ion oxidation reaction （ClOR）,glycerol oxidation reaction （GOR） is more thermodynamically and kinetically favorable ***,a Ru doping cobalt phosphide （Ru-CoP2） is proposed as a robust bifunctional electrocatalyst for seawater electrolysis and GOR,for the concurrent productions of hydrogen and value-added *** in situ and ex situ characterization analyses demonstrated that Ru doping featured in the dynamic reconstruction process from Ru-CoP2to Ru-CoOOH,accounting for the superior GOR *** coupling GOR with hydrogen evolution was realized by employing Ru-CoP2as both anode and cathode,requiring only a low voltage of 1.43 V at 100 mA cm-2,which was 250 m V lower than that in alkaline *** work guides the design of bifunctional electrocatalysts for energy-efficient seawater electrolysis coupled with biomass resource upcycling.

关键词： Glycerol electrooxidation Hydrogen evolution Ru doping Cobalt phosphide Bifunctional electrocatalysts

Pseudo almost automorphic solution to stochastic differential equation driven by Levy process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2018年第4期13卷 779-796页

作者： Xinwei feng Gaofeng zong School of Mathematics Shandong University Jinan 250100 China School of Mathematics and Quantitative Economics Shandong University of Financeand Economics Jinan 250014 China

Almost automorphic is a particular case of the recurrent motion, which has been studied in differential equations for a long time. We introduce square-mean pseudo almost automorphic and some of its properties, and then study the pseudo almost automorphic solution in the distribution sense to stochastic differential equation driven by Levy process.

关键词： Pseudo almost automorphic square-mean almost automorphic almost automorphic in distribution stochastic differential equation mildsolution Levy process