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Notch Flexure as Kirigami Cut for Tunable Mechanical Stretchability towards Metamaterial Application

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International Journal of Smart and Nano Materials 2022年第2期13卷 203-217页

作者： yanqi yin Yang Yu Bo Li Guimin Chen State Key Laboratory of Manufacturing System Engineering Shaanxi Key Laboratory of Intelligent RobotsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anShaanxiChina

Kirigami is an art of paper cutting,which can be used in mechanical metamaterials,actuators,and energy absorption based on its deployable and load-deflection *** cuts with zero width produce undesirable plastic deformation or even tear fracture due to stress concentration in *** study proposes to enlarge the cut width into a notch flexure,which is applied to an orthogonality-cutted kirigami sheet,which buckles out of plane into a 3D configuration patterns under uniaxial *** use of compliant beam as the notch makes the stress distribution around the cuts more uniform in both elastic and elastoplastic *** experimental and numerical results show that by tuning the geometric parameters of cuts and material properties of the sheets,the trigger condition of 3D patterns can be *** capability of tunable phononic wave propagation in this kirigami-inspired metamaterial is *** design methodology offers a theoretical guide for kirigami-based structures.

关键词： Kirigami design compliant mechanism flexural hinge mechanical metamaterials buckling instability

肾脏病预后质量倡议:血管通路临床实践指南2019年更新的解读与探讨

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中华肾脏病杂志 2020年第7期36卷 560-567页

作者：尹彦琪金其庄北京大学第一医院肾脏内科北京大学肾脏病研究所卫生部肾脏疾病重点实验室慢性肾脏病防治教育部重点实验室北京100034

功能良好的血管通路是进行血液透析治疗的必备条件。随着终末期肾脏病患者逐渐增多、透析龄延长以及糖尿病、高血压等合并症的比例逐渐增加,血管通路的建立、使用和维护已经成为不容忽视的临床问题,能否建立并维护功能良好的血管通路对... 详细信息

功能良好的血管通路是进行血液透析治疗的必备条件。随着终末期肾脏病患者逐渐增多、透析龄延长以及糖尿病、高血压等合并症的比例逐渐增加,血管通路的建立、使用和维护已经成为不容忽视的临床问题,能否建立并维护功能良好的血管通路对终末期肾脏病患者的预后至关重要。近期,美国肾脏病基金会(NKF)所属“肾脏病预后质量倡议(KDOQI)”发布了血管通路临床实践指南的2019年更新。该指南在理念和策略上较2006年更新有了较大变化。我们对该指南进行了解读和探讨,以期有助于国内血管通路工作者理解该指南的核心内容,推动我国血管通路事业的发展。

关键词：肾透析动静脉瘘导管,留置血管通路终末期肾脏病移植物内瘘中心静脉

膜法富氧气及UF膜法CuO用于异丙苯氧化反应的研究

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化学反应工程与工艺 2008年第1期24卷 35-39页

作者：孙余凭尹燕亓顾瑾夏恒军江南大学化学与材料工程学院江苏无锡214122

采用超滤（UF）膜法制备了CuO催化剂，结合富氧膜提供的富氧气为氧化剂研究异丙苯氧化反应。用X射线衍射（XRD）和扫描电镜（SEM）对催化剂的结构和形貌进行了表征。考察了催化剂用量、反应温度和不同O2含量的富氧气对异丙苯氧化反应的... 详细信息

采用超滤（UF）膜法制备了CuO催化剂，结合富氧膜提供的富氧气为氧化剂研究异丙苯氧化反应。用X射线衍射（XRD）和扫描电镜（SEM）对催化剂的结构和形貌进行了表征。考察了催化剂用量、反应温度和不同O2含量的富氧气对异丙苯氧化反应的影响。结果表明，UF膜法CuO的粒径为14nm，比表面积为36．91m^2／g。在反应温度90℃，富氧膜渗透气中O2体积含量28．8％，UF膜CuO催化剂用量0．01g／mL条件下，反应10h，过氧化氢异丙苯收率为28％，符合工业化的要求。在相同条件下，UF膜法CuO比商品CuO的催化剂效果提高50％～60％，膜法富氧气使异丙苯氧化反应效率比空气氧化提高一倍。

关键词：超滤膜法氧化铜异丙苯过氧化氢异丙苯膜法富氧气催化氧化

Hydrogen and nitrogen absorption properties of Ce-added Zr_(2)(Fe_(1-x)Ni_(x)) alloys

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Journal of Rare Earths 2024年第6期42卷 1136-1141,I0005页

作者： Kai yin Xiaopeng Liu State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijing10088China GRIMAT Engineering Institute Co. Ltd.Beijing101407China General Research Institute of Nonferrous Metals Beijing100088China

To improve the nitriding resistance of Zr_(2)Fe alloy,the Ce-added Zr_(2)(Fe_(1-x)Ni_(x))(x=0,0.15,0.3,0.5)alloys were prepared by magnetic levitation melting *** effects of Ni substitution for Fe on the phase structure,hydrogen and nitrogen absorption properties of the alloys were investigated by X-ray diffraction,scanning electron microscopy and p-c isotherm *** experimental results show that Ni substitution can effectively inhibit the formation of both α-Zr and ZrFe_(2) phases and promote the formation of C16 structure Zr_(2)(Fe,Ni)phase,causing Ni-substituted alloys to exhibit low nitrogen absorption rate and *** 623 K under 0.5 MPa nitrogen pressure,the nitrogen absorption capacity of Ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy reaches to 0.8 mL/g,much lower than that of Zr_(2)Fe alloy(1.5 mL/g).Ni substitution decreases the crystal cell volume of the C_(16)Zr_(2)(Fe,Ni)phase,resulting in an increase in the hydrogen absorption equilibrium *** 623 K under 0.05 MPa hydrogen pressure,the hydrogen absorption capacity decreases from 1.46 wt%of Zr_(2)Fe alloy to 1.41 wt%of Ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy.

关键词： Zr_(2)Fe alloy Ce Pressure-composition isotherm Hydrogen absorption Nitrogen absorption Rare earths

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连续流动分析法快速测定烟用水基胶中的甲醛

烟草科技 2013年第2期46卷 65-67页

作者：殷延齐张洪召丁超徐如彦李彬江苏中烟工业有限责任公司徐州卷烟厂江苏省徐州市环城路80号221000

为了控制烟用水基胶中甲醛的含量，利用甲醛与间苯三酚在碱溶液中反应生成不稳定橙色化合物的最大吸收峰位于474nm的原理，建立了连续流动分光光度法快速测定烟用水基胶中甲醛含量的方法。结果表明：该方法的相对标准偏差和回收率分别为... 详细信息

为了控制烟用水基胶中甲醛的含量，利用甲醛与间苯三酚在碱溶液中反应生成不稳定橙色化合物的最大吸收峰位于474nm的原理，建立了连续流动分光光度法快速测定烟用水基胶中甲醛含量的方法。结果表明：该方法的相对标准偏差和回收率分别为1．30％和92．75～102．54％。该方法具有操作简单，准确、快速，可利用已有的氯模块等优点，适合于烟用水基胶中甲醛含量的测定。

关键词：连续流动分析法甲醛烟用水基胶

Rational surface charge engineering of haloalkane dehalogenase for boosting the enzymatic performance in organic solvent solutions

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Chinese Journal of Chemical Engineering 2024年第1期65卷 276-285页

作者： yin Wu Yan Sun Department of Biochemical Engineering School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(Ministry of Education)Tianjin UniversityTianjin 300350China

Biocatalysis in organic solvents(OSs)has numerous important applications,but native enzymes in OSs often exhibit limited catalytic ***,we proposed a computation-aided surface charge engineering strategy to improve the catalytic performance of haloalkane dehalogenase DhaA in OSs based on the energetic analysis of substrate binding to the DhaA *** variants with enhanced OS resistance were obtained by replacing negative charged residues on the surface with positive charged residue(Arg).Particularly,a four-substitution variant E16R/E93R/E121R/E257R exhibited the best catalytic performance(five-fold improvement in OS resistance and seven-fold half-life increase in 40%(vol)dimethylsulfoxide).As a result,the overall catalytic performance of the variant could be at least 26 times higher than the wild-type *** spectroscopy and molecular dynamics simulation studies revealed that the residue substitution mainly enhanced OS resistance from four aspects:(a)improved the overall structural stability,(b)increased the hydrophobicity of the local microenvironment around the catalytic triad,(c)enriched the hydrophobic substrate around the enzyme molecule,and(d)lowered the contact frequency between OS molecules and the catalytic *** findings validate that computationaided surface charge engineering is an effective and ingenious rational strategy for tailoring enzyme performance in OSs.

关键词： Surface charge engineering Organic solvent resistance Molecular dynamics simulation Haloalkane dehalogenase

A generalized presentation of multi-caloric effects based on exterior derivative theory and its applications

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Communications in Theoretical Physics 2024年第8期76卷 156-163页

作者： Jun yin School of Materials Science and Engineering Nankai UniversityTianjin 300350China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China

The emerging concept of multi-caloric effects, introduced in 2010, entails the application of multiple interplay fields to a thermodynamic system. While multi-caloric effects are the main focus of experimental endeavors, theoretical considerations fall short of providing a thorough understanding. This paper introduces a comprehensive presentation on multi-caloric effects,employing the method and theory of exterior derivative formations. It addresses every aspect of thermodynamic systems, showcasing its applicability to multi-caloric materials(both singlephase and multi-phase materials), and its adaptability to different scenarios(either in single or multiple force fields). The formulation of Maxwell relationships, characterized by their generality and universality, enables a clear prediction in entropy and temperature, facilitating a distinct identification between independent and interdependent contributions from multi-caloric effects. These insights hold significant importance in designing and developing specialized thermodynamic materials, optimizing functional performances and exploring innovative mechanisms.

关键词： multicaloric effects Maxwell relations isothermal entropy adiabatic temperature

脑胶质瘤患者主要照顾者预期性悲伤现状及其影响因素分析

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临床护理杂志 2021年第2期20卷 6-9页

作者：尹艳琪中南大学湘雅医院长沙410008

目的了解脑胶质瘤患者主要照顾者预期性悲伤现状,并分析其影响因素。方法采用便利抽样法,选取我科住院治疗的162名脑胶质瘤患者主要照顾者作为调查对象,采用预期性悲伤量表、应对方式量表、照顾者负担量表进行横断面调查。结果脑胶质瘤... 详细信息

目的了解脑胶质瘤患者主要照顾者预期性悲伤现状,并分析其影响因素。方法采用便利抽样法,选取我科住院治疗的162名脑胶质瘤患者主要照顾者作为调查对象,采用预期性悲伤量表、应对方式量表、照顾者负担量表进行横断面调查。结果脑胶质瘤患者主要照顾者预期性悲伤得分为(77.85±10.52)分,得分率为57.67%。线性回归分析结果显示,照顾者年龄、与患者之间的关系、应对方式以及照顾负担为影响预期性悲伤的主要因素(P<0.05)。结论脑胶质瘤患者主要照顾者预期性悲伤处于中等水平,医护人员应重视消极心理以及照顾负担较重的照顾者,提供有效的干预措施,降低其预期性悲伤水平。

关键词：胶质瘤照护者预期性悲伤

Variational Analysis Based on Proximal Subdifferential on Smooth Banach Spaces

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Acta Mathematica Sinica,English Series 2024年第2期40卷 595-618页

作者： Xi yin ZHENG Department of Mathematics Yunnan UniversityKunming 650091P.R.China

This paper first shows that for any p∈(1,2)there exists a continuously differentiable function f on l^(p)(and L^(p))such that the proximal subdifferential of f is empty everywhere,and hence it is not suitable to develop theory on proximal subdifferential in the classical Banach spaces l^(P)and L^(P) with p∈(1,2).On the other hand,this paper establishes variational analysis based on the proximal subdifferential in the framework of smooth Banach spaces of power type 2,which conclude all Hilbert spaces and all the classical spaces l^(P)and L^(P)with p∈(2,+∞).In particular,in such a smooth space,we provide the proximal subdifferential rules for sum functions,product functions,composite functions and supremum functions,which extend the basic results on the proximal subdifferential established in the framework of Hilbert *** of our main results are new even in the Hilbert space *** applications,we provide KKT-like conditions for nonsmooth optimization problems in terms of proximal subdifferential.

关键词： Smooth Banach space proximal subdifferential proximal normal cone KKT condition