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Influence of the Nonmagnetic Impurity on the Spin Density State of High-t_(c) Cuprate Oxides

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Chinese Physics Letters 1997年第5期14卷 379-382页

作者： SHI da-ning College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016

this letter deals with the suppressive effect of the nonmagnetic impurity,doped into the parent compound of the high-t_(c) superconductor,on the spin density wave(SDW)*** into account the van Hove singularity in the Fermi surface of the two-dimensional square lattice,our results indicate that the nonmagnetic impurity can lead to sharp reduction of the SDW order,which is in qualitative agreement with the experimental reports.

关键词： state magnetic singularity

正常高值血压者尿NGAL与血流介导的血管舒张功能的相关性

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昆明医科大学学报 2024年第1期45卷 127-132页

作者：彭达张爱军武汉科技大学附属武昌医院心内科湖北武汉430063 武汉科技大学第八临床医学院湖北武汉430081

目的探究正常高值血压患者的尿中性粒细胞明胶酶相关脂质运载蛋白(NGAL)与肱动脉血流介导的血管舒张功能(FMD)的相关性。方法研究选择2022年9月至2023年9月期间,在武汉市武昌医院珞狮路社区卫生服务中心进行健康体检发现的156例正常... 详细信息

目的探究正常高值血压患者的尿中性粒细胞明胶酶相关脂质运载蛋白(NGAL)与肱动脉血流介导的血管舒张功能(FMD)的相关性。方法研究选择2022年9月至2023年9月期间,在武汉市武昌医院珞狮路社区卫生服务中心进行健康体检发现的156例正常高值血压患者为研究对象,将156例正常高值血压患者按FMD是否在10%以上,分为内皮功能正常组89例和内皮功能障碍组67例。收集所有患者的性别、年龄、吸烟史、身高、体重、收缩压(SBP)、舒张压(DBP)、血糖(FBG)、血脂、血清肌酐(SCr)、肾小球滤过率(e GFR)、尿素氮(BUN)、尿酸(UA)、同型半胱氨酸(Hcy)、尿NGAL、FMD等指标。采用独立样本t检验、线性相关、二元Logistic回归、ROC曲线分析正常高值血压患者中FMD与NGAL的相关性。结果 2组患者在性别,吸烟史、SBP、FBG、总胆固醇(tC)、低密度脂蛋白(LDL-c)、三酰甘油(tG)、 BUN、SCr、eGFR、UA、Hcy等方面,差异无统计学意义(P>0.05)。内皮功能障碍组(FMD≤10%)年龄、体质指数(BMI)、DBP、高密度脂蛋白(HDL-c)及尿NGAL水平明显高于内皮功能正常组(P tic回归分析结果显示:尿NGAL、舒张压是FMD的独立危险因素,ROC曲线分析NGAL、DBP及NGAL联合DBP检测的曲线下面积依次为0.813、0.895、0.906,两者联合检测诊断效能更高。结论尿NGAL和舒张压与内皮功能障碍相关,尿NGAL有望作为评价血管内皮功能损伤的新型生物标志物,及正常高值血压干预治疗的靶点。

关键词：中性粒细胞明胶酶相关脂质运载蛋白肱动脉血流介导的血管舒张功能正常高值血压高血压

the time discretization in classes of integro-differential equations with completely monotonic kernels:Weighted asymptotic stability

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Science China Mathematics 2013年第2期56卷 395-424页

作者： XU da Department of Mathematics Hunan Normal University

We study discretization in classes of integro-differential equationswhere the functions aj（t）, 1 ≤ j ≤n, are completely monotonic on （0, ∞） and locally integrable, but not constant. the equations are discretized using the backward Euler method in combination with order one convolution quadrature for the memory term. the stability properties of the discretization are derived in the weighted 11 （p; 0, ∞） norm, where p is a given weight function. Applications to the weighted l^1 stability of the numerical solutions of a related equation in Hilbert space are given.

关键词： the classes of integro-differential equation completely monotonic kernel backward Euler method convolution quadrature weighted l^1 asymptotic stability

A modular microfluidic system based on a multilayered configuration to generate large-scale perfusable microvascular networks

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Microsystems & Nanoengineering 2021年第1期7卷 63-75页

作者： tao Yue da Zhao Duc t.t.Phan Xiaolin Wang Joshua Jonghyun Park Zayn Biviji Christopher C.W.Hughes Abraham P.Lee Department of Biomedical Engineering University of CaliforniaIrvineCAUSA School of Mechatronic Engineering and Automation Shanghai UniversityShanghaiChina Department of Molecular Biology and Biochemistry University of CaliforniaIrvineCAUSA Department of Micro/Nano Electronics Shanghai Jiao Tong UniversityShanghaiChina National Key Laboratory of Science and technology for Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghaiChina Key Laboratory for thin Film and Micro Fabrication of the Ministry of Education Shanghai Jiao Tong UniversityShanghaiChina Department of Electrical Engineering and Computer Science University of CaliforniaIrvineCAUSA. Department of Applied Mathematics-Biology Brown UniversityProvidenceRIUSA. Department of Mechanical and Aerospace Engineering University of CaliforniaIrvineCAUSA

the vascular network of the circulatory system plays a vital role in maintaining homeostasis in the human *** this paper,a novel modular microfluidic system with a vertical two-layered configuration is developed to generate largescale perfused microvascular networks in *** two-layer polydimethylsiloxane(PDMS)configuration allows the tissue chambers and medium channels not only to be designed and fabricated independently but also to be aligned and bonded *** method can produce a modular microfluidic system that has high flexibility and scalability to design an integrated platform with multiple perfused vascularized tissues with high *** medium channel was designed with a rhombic shape and fabricated to be semiclosed to form a capillary burst valve in the vertical direction,serving as the interface between the medium channels and tissue *** and anastomosis at the vertical interface were successfully achieved by using different combinations of tissue chambers and medium *** large-scale microvascular networks were generated and quantified in terms of vessel length and *** leakage of the perfused 70-kda FItC-dextran confirmed the lumenization of the microvascular networks and the formation of tight vertical interconnections between the microvascular networks and medium channels in different structural *** platform enables the culturing of interconnected,large-scale perfused vascularized tissue networks with high density and scalability for a wide range of multiorgan-on-a-chip applications,including basic biological studies and drug screening.

关键词： interconnection networks configuration

An approach to the capsule endoscopic robot with active drive motion

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 223-231页

作者： da-qiang GU Yong ZHOU Department of Mechanical Engineering Zhejiang University Hangzhou 310027 China

Commercialized capsule-type endoscopes move passively by peristaltic waves (and gravity),which makes it difficult for doctors to diagnose the areas of interest more thoroughly and *** resolve this problem of passivity,it is necessary to find a special locomotion principle,which fits the gastrointestinal (GI) *** this paper,a legged locomotive mechanism with shape memory alloy (sma) actuation based on the peristaltic principle is proposed,and then the structure of the locomotion mechanism is *** on the preliminary results,the design,modeling,and fabrication of an sma microactuation concept for application in an endoscopic capsule are given,as well as the sma spring and legged component design,which is the core section of the system *** used the pseudo-rigid-body model (PRBM) to analyze nonlinear and large deflections of the sma legged ***,a prototype endoscope with an sma spring and six legged components was designed and *** is 15 mm in diameter and 33 mm in total length,with a hollow space to house other parts needed for endoscopy such as a camera,a radio frequency (RF) module,and *** testing,the locomotive mechanism was effective in a plastic tube environment.

关键词： Capsular endoscopy Shape memory alloy (sma) Microactuation Locomotion

t/AHMS 0003-2023《气象文物价值分类指南》标准解读

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标准科学 2024年第4期 136-140页

作者：张丽孙大兵芜湖市气象局

气象文物是反映我国气象发展历史、气象科学的实物。随着国家气象现代化水平的提高和对气象文化的日益重视,对气象文物的保护和利用提出了新的要求,2023年2月20日安徽省气象学会发布t/AHMS 0003-2023《气象文物价值分类指南》,首次在气... 详细信息

气象文物是反映我国气象发展历史、气象科学的实物。随着国家气象现代化水平的提高和对气象文化的日益重视,对气象文物的保护和利用提出了新的要求,2023年2月20日安徽省气象学会发布t/AHMS 0003-2023《气象文物价值分类指南》,首次在气象文物价值分类方面进行了标准化研究,标志着我国在气象和文物两个领域跨学科的研究更加科学规范。本文介绍了标准的制定背景、解读了标准的主要内容,根据适当的背景知识对气象文物价值分类的原则、依据、采集因素和分类方法提供普遍性、方向性的指导和建议。旨在为气象博物馆、气象局史馆等气象文化场馆征集、保管、研究和利用气象文物提供一定的参考,为实现气象文物管理工作科学化、规范化提供一定的理论基础和实践经验。

关键词： t/AHMS 0003-2023 气象文物价值分类气象历史气象文化

Impact of device resistances in the performance of graphene‑based terahertz photodetectors

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Frontiers of Optoelectronics 2024年第2期17卷 87-97页

作者： O.Castelló Sofía M.López Baptista K.Watanabe t.taniguchi E.Diez J.E.Velázquez-Pérez Y.M.Meziani J.M.Caridad J.A.Delgado-Notario Department of Applied Physics University of Salamanca37008 SalamancaSpain Unidad de Excelencia en Luz y Materia Estructurada(LUMES) University of Salamanca37008 SalamancaSpain Research Center for Electronic and Optical Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Nanotechnology Group USAL-NanolabUniversity of Salamanca37008 SalamancaSpain

In recent years,graphene field-effect-transistors(GFEts)have demonstrated an outstanding potential for terahertz(tHz)photodetection due to their fast response and *** features are essential to enable emerging tHz applications,including 6G wireless communications,quantum information,bioimaging and ***,the overall performance of these photodetectors may be utterly compromised by the impact of internal resistances presented in the device,so-called access or parasitic *** this work,we provide a detailed study of the influence of internal device resistances in the photoresponse of high-mobility dual-gate GFEt *** dual-gate architectures allow us to fine tune(decrease)the internal resistance of the device by an order of magnitude and consequently demonstrate an improved responsivity and noise-equivalent-power values of the photodetector,*** results can be well understood by a series resistance model,as shown by the excellent agreement found between the experimental data and theoretical *** findings are therefore relevant to understand and improve the overall performance of existing high-mobility graphene photodetectors.

关键词： Graphene tHz Photodetector Field-effect transistor Plasmonic

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钛酸铁催化臭氧氧化降解水中莠去津

环境科学学报 2024年第5期44卷 102-111页

作者：李佳艺何银宁陈怡沈星汪达宋爽马军浙江工业大学环境学院浙江省工业污染微生物控制技术重点实验室杭州310032 哈尔滨工业大学环境学院城市水资源与水环境国家重点实验室哈尔滨150006

采用一步水热法制备钛酸铁(FetiO_(3))双金属位材料作为臭氧催化剂,实现水中难降解农药莠去津(AtZ)的有效去除.通过扫描电子显微镜、透射电子显微镜、X射线衍射等方法表征所制备FetiO_(3)的物理化学特征,FetiO_(3)为规则的正六边形纳米... 详细信息

采用一步水热法制备钛酸铁(FetiO_(3))双金属位材料作为臭氧催化剂,实现水中难降解农药莠去津(AtZ)的有效去除.通过扫描电子显微镜、透射电子显微镜、X射线衍射等方法表征所制备FetiO_(3)的物理化学特征,FetiO_(3)为规则的正六边形纳米片,比表面积为18.53 m^(2)·g^(-1).通过催化臭氧氧化降解实验探究水中AtZ的降解性能,在pH=7.0、t=283 K、臭氧浓度3 mg·L^(-1)、催化剂投加量1 g·L^(-1)的条件下反应20 min,AtZ的降解率可达100%.由淬灭实验及电子顺磁共振分析可知,羟基自由基是体系中生成的主要活性氧物种.将FetiO_(3)催化剂重复使用6次,AtZ降解率均可达98%,且FetiO_(3)催化活性和结构稳定性基本保持不变.FetiO_(3)催化剂可在臭氧催化氧化体系中表现出高效的难降解污染物去除效能、结构稳定特征和易分离性能.

关键词：钛酸铁臭氧催化氧化莠去津催化剂纳米材料氧化

液压支架凹角圆管式薄壁构件吸能特性分析与优化

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机械设计与制造 2024年第10期 266-271,276页

作者：王春华杨雨泽安达唐治沈阳航空航天大学机电工程学院辽宁沈阳110000 辽宁工程技术大学力学与工程学院辽宁阜新123000

为有效防治煤矿冲击地压,增强液压立柱防冲性能,提出了新型凹角圆管式吸能防冲构件。通过数值模拟方法分析了构件凹角数量、直径和厚度对吸能特性的影响。基于响应面函数,运用理想点法对比吸能和载荷平稳系数两指标进行了多目标优化。... 详细信息

为有效防治煤矿冲击地压,增强液压立柱防冲性能,提出了新型凹角圆管式吸能防冲构件。通过数值模拟方法分析了构件凹角数量、直径和厚度对吸能特性的影响。基于响应面函数,运用理想点法对比吸能和载荷平稳系数两指标进行了多目标优化。结果表明:构件发生了倾斜渐进有序变形、渐进有序变形、无序挤压变形和混合变形四种稳定的变形模式,倾斜渐进有序变形吸能特性最好,渐进有序变形吸能特性最差。径厚比较大时,构件偏心率较小,多发生倾斜渐进有序变形模式,载荷位移曲线波动较小,吸能特性较好;径厚比较小时,构件偏心率较大,构件载荷位移曲线波动较大,吸能特性较差。优化结果表明凹角数量N=4、壁厚t=5.38mm、半径R=83.28mm构件吸能特性最佳,比吸能较圆管增加了17.80%,载荷平稳系数增加了29.17%。

关键词：液压支架数值模拟吸能防冲构件变形模式能量吸收多目标优化