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NiCr_(2)O_(4)化合物的磁相变临界行为

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安徽大学学报（自然科学版） 2024年第5期48卷 42-46页

作者：张名锋曹睿阳斯一凡戴振翔郑赣鸿安徽大学材料科学与工程学院安徽合肥230601 安徽大学物理与光电工程学院安徽合肥230601

采用标准固相法制备NiCr_(2)O_(4),并对其结构、磁性能和磁相变临界行为进行研究.研究结果表明:NiCr_(2)O_(4)具有尖晶石结构;当温度低于居里温度TC时,随着磁场强度增加,磁化强度趋于饱和;当温度高于TC,随着磁场强度增加,磁化强度线性增... 详细信息

采用标准固相法制备NiCr_(2)O_(4),并对其结构、磁性能和磁相变临界行为进行研究.研究结果表明:NiCr_(2)O_(4)具有尖晶石结构;当温度低于居里温度TC时,随着磁场强度增加,磁化强度趋于饱和;当温度高于TC,随着磁场强度增加,磁化强度线性增加,NiCr_(2)O_(4)呈顺磁特征;长程和短程铁磁相互作用共存于NiCr_(2)O_(4).

关键词： NiCr_(2)O_(4) 二级相变临界行为居里温度

Characterizing a lubricant additive for 1,3,4-tri-(2-octyldodecyl) cyclopentane: Computational study and experimental verification

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Friction 2016年第3期4卷 257-265页

作者： Jingyan NIAN yifan si Zhiguang GUO Ping GAO Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 ChinaHubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University Wuhan 430062 China

In order to increase the life of spacecraft, it is important to improve the comprehensive lubrication performance. Multiple alkylated cyclopentane (MAC) lubricants are presently gaining wide acceptance for actual space applications; adding extreme pressure additive is a strategy to improve lubrication performance. In this study, taking 1,3,4-tri-(2-octyldodecyl) cyclopentane as base oil, tricresol phosphate (traditional additive) and tri-(2-octyldodecyl) phosphate (developmental additive) have been screened computationally for compatibility, shear film forming and energy dissipation. Theoretical results indicate that (a) tricresol phosphate additive is not suited for addition to 1,3,4-tri-(2-octyldodecyl) cyclopentane lubricant due to limited compatibility; (b) tri-(2-octyldodecyl) phosphate is an excellent lubricant additive due to its perfect compatibility, ease of forming a shear film on the surface of friction pairs, higher strength, and low energy dissipation; and (c) lubrication occurs through the solid-liquid composite lubrication mechanism. These theoretical results were confirmed experimentally.

关键词： 1,3,4-tri-(2-octyldodecyl) cyclopentane lubricant additive computational screening lubrication mechanism experimental verification

Electrospun Textile Strategies in Tendon to Bone Junction Reconstruction

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Advanced Fiber Materials 2023年第3期5卷 764-790页

作者： Xiaoyun Xu yifan si Yi Zhao Qinfei Ke Jinlian Hu Department of Biomedical Engineering City University of Hong KongHong Kong S.A.R 999077China Shanghai Frontiers Science Center of Advanced Textiles Donghua UniversityShanghai 201620China Shanghai Institute of Technology Shanghai 200235China

The repair of tendon to bone junction(TBJ)remains a tremendous challenge in tissue engineering due to the complicated structure,components,mechanical properties,and cell *** order to reconstruct the tissue and restore its functionality,biomedical scaffolds with hierarchical and gradient structures have been fabricated by various *** recent decades,electrospinning has become one of the most popular methods in fabricating TBJ scaffolds due to easy fabrication,high porosity,and ECM-like nano-scale ***,mechanical properties are the pain point of electrospun biomedical *** textile technology can be exploited to compensate for this weakness,which will be deeply discussed *** review will start with a brief introduction to the structure and function of the native TBJ tissue and a short overview of electrospinning ***,different electrospun biomedical scaffolds for TBJ repair will be summarized and ***,some advanced technologies and modification methods in fabricating functionalized electrospun TBJ scaffolds are *** the end,current challenges and solutions are being proposed,which would provide instruction for the research of electrospun textile TBJ scaffolds.

关键词： Electrospun Textile Tendon to bone Tissue engineering Biomimetic

Bioinspired All‑Fibrous Directional Moisture‑Wicking Electronic Skins for Biomechanical Energy Harvesting and All‑Range Health Sensing

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Nano-Micro Letters 2023年第4期15卷 277-293页

作者： Chuanwei Zhi Shuo Shi Shuai Zhang yifan si Jieqiong Yang Shuo Meng Bin Fei Jinlian Hu Department of Biomedical Engineering City University of Hong KongHong Kong S.A.R 999077China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong Kong S.A.R 999077China City University of Hong Kong Shenzhen Research Institute Shenzhen 518057People’s Republic of China

Electronic skins can monitor minute physiological signal variations in the human skins and represent the body’s state,showing an emerging trend for alternative medical diagnostics and human-machine *** this study,we designed a bioinspired directional moisture-wicking electronic skin(DMWES)based on the construction of heterogeneous fibrous membranes and the conductive MXene/CNTs electrospraying *** moisture transfer was successfully realized by surface energy gradient and push-pull effect via the design of distinct hydrophobic-hydrophilic difference,which can spontaneously absorb sweat from the *** DMWES membrane showed excellent comprehensive pressure sensing performance,high sensitivity(maximum sensitivity of 548.09 kPa^(−1)),wide linear range,rapid response and recovery *** addition,the single-electrode triboelectric nanogenerator based on the DMWES can deliver a high areal power density of 21.6μW m^(−2) and good cycling stability in high pressure energy ***,the superior pressure sensing and triboelectric performance enabled the DMWES for all-range healthcare sensing,including accurate pulse monitoring,voice recognition,and gait *** work will help to boost the development of the next-generation breathable electronic skins in the applications of AI,human-machine interaction,and soft robots.

关键词： Bioinspired Electrospinning Electronic skin Directional moisture wicking MXene

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Bioinspired Stable single‑Layer Janus Fabric with Directional Water/Moisture Transport Property for Integrated Personal Cooling Management

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Advanced Fiber Materials 2023年第1期5卷 138-153页

作者： yifan si Shuo Shi Zhichao Dong Hanbai Wu Fengxin Sun Jieqiong Yang Jinlian Hu Department of Biomedical Engineering City University of Hong KongHong Kong S.A.R 999077China CAS Key Laboratory of Bio‑Inspired Materials and Interfacial Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Eco‑Textiles of Ministry of Education Jiangnan UniversityWuxi 214122China

Extensive progress has been achieved regarding Janus fabric for directional water transport due to its excellent and feasible personal cooling management ability,which has great significance for energy conservation,pollution reduction,and human ***,existing Janus asymmetric multilayer fabrics for directional water transport are still limited by their com-plicated syntheses and poor *** by the compositionally graded architecture of leaf cuticles,we propose a single-layer Janus personal cooling management fabric(JPCMF)via a one-step electrospinning *** JPCMF shows not only great directional bulk water transport ability but also asymmetry moisture(water vapor)transport ability with a high asymmetry factor(1.49),water vapor transmission value(18.5 kg^(-1) m-2 D-1),and water evaporation rate(0.735 g h^(-1)).Importantly,the JPCMF exhibits outstanding durability and stability thanks to a novel electrostatic adsorption-assisted self-adhesion strategy for resisting abrasion,peeling and *** these characteristics,the JPCMF can achieve a 4.0°C personal cooling management effect,better than taht of cotton fabric,on wet *** good biocompatibility and nontoxic-ity also endow the JPCMF with the potential to be a self-pumping *** strategy should facilitate a new method for developing next-generation intelligent multifunctional fabrics.

关键词： Cooling management Janus directional transport Electrospinning Superwettability bioinspired

Automated identification of steel weld defects,a convolutional neural network improved machine learning approach

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 294-308页

作者： Zhan SHU Ao WU Yuning si Hanlin DONG Dejiang WANG yifan LI School of Mechanics and Engineering Science Shanghai UniversityShanghai 200444China School of Civil Engineering Shanghai Normal UniversityShanghai 201418China Shanghai PinlanData Technology Co. Ltd.Shanghai 200072China

This paper proposes a machine-learning-based methodology to automatically classify different types of steel weld defects,including lack of the fusion,porosity,slag inclusion,and the qualified(no defects)*** methodology solves the shortcomings of existing detection methods,such as expensive equipment,complicated operation and inability to detect internal *** study first collected percussed data from welded steel members with or without weld ***,three methods,the Mel frequency cepstral coefficients,short-time Fourier transform(STFT),and continuous wavelet transform were implemented and compared to explore the most appropriate features for classification of weld *** and convolutional neural network-enhanced algorithms were used to classify,the extracted ***,experiments were designed and performed to validate the proposed *** showed that STFT achieved higher accuracies(up to 96.63%on average)in the weld status *** convolutional neural network-enhanced support vector machine(SVM)outperformed six other algorithms with an average accuracy of 95.8%.In addition,random forest and SVM were efficient approaches with a balanced trade-off between the accuracies and the computational efforts.

关键词： steel weld machine learning convolutional neural network weld defect detection classification task percussion

Preparation and acoustic properties of high-temperature acoustic emission sensor based on La_(3)Ga_(5)siO_(14) crystal

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Journal of Advanced Dielectrics 2024年第1期14卷 25-32页

作者： Jingxiang si Changhong Yang Rui Guo yifan Wu Xiujuan Lin Shifeng Huang Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Jinan 250022P.R.China

With the rapid development of modern industries,the high-temperature piezoelectric sensors that can work in extreme environments are in great *** this work,langasite(La_(3)Ga_(5)siO_(14),LGS),as a high-temperature piezoelectric crystal with stable electro-elastic performance,is used as core element,and air and porous Al_(2)O_(3) are selected as backing layers respectively to prepare two kinds of high-temperature acoustic emission(AE)*** detection sensitivities at 25–500℃ are analyzed by the ball falling test and Hsu–Nielsen *** the condition of 25–500℃,the received amplitude signals by both sensors are maintained above 90 dB stimulated by the ZrO_(2) ceramic ball *** the Hsu–Nielsen experiment,as the temperature rising from 25℃ to 500℃,the signal amplitude of sensor with air backing layer decays from 447 mV to 365 mV,while the signal amplitude varies from 270 mV to 203 mV for the sensor with porous Al_(2)O_(3) backing ***,compared with the bandwidth of the air-backing sensor(37–183 kHz),the sensor with porous Al_(2)O_(3) backing layer broadens bandwidth to 28–273 *** results show that both these AE sensors have strong and stable response ability to AE signals at high-temperature of 500℃.Therefore,piezoelectric AE sensor based on LGS has great potential application in the ffeld of high-temperature structural health monitoring.

关键词： La_(3)Ga_(5)siO_(14) acoustic emission sensor sensitivity structural health monitoring

Bioinspired polysaccharide-based nanocomposite membranes with robust wet mechanical properties for guided bone regeneration

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National Science Review 2024年第3期11卷 215-226页

作者： Jian-Hong Xiao Zhen-Bang Zhang JiaHao Li si-Ming Chen Huai-Ling Gao YinXiu Liao Lu Chen ZiShuo Wang yifan Lu YuanZhen Hou HengAn Wu DuoHong Zou Shu-Hong Yu Department of Chemistry New Cornerstone Science Laboratory Institute of Biomimetic Materials&Chemistry Anhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Department of Dental Implant Center Stomatologic Hospital and College Key Laboratory of Oral Diseases Research of Anhui Province Anhui Medical University CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Department of Oral Surgery College of Stomatology National Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology Shanghai Research Institute of Stomatology Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Institute of Innovative Materials(I2M) Department of Chemistry Department of Materials Science and Engineering Southern University of Science and Technology

Polysaccharide-based membranes with excellent mechanical properties are highly desired. However, severe mechanical deterioration under wet conditions limits their biomedical applications. Here, inspired by the structural heterogeneity of strong yet hydrated biological materials, we propose a strategy based on heterogeneous crosslink-and-hydration（HCH） of a molecule/nano dual-scale network to fabricate polysaccharide-based nanocomposites with robust wet mechanical properties. The heterogeneity lies in that the crosslink-and-hydration occurs in the molecule-network while the stress-bearing nanofiber-network remains unaffected. As one demonstration, a membrane assembled by bacterial cellulose nanofiber-network and Ca2+-crosslinked and hydrated sodium alginate molecule-network is designed. Studies show that the crosslinked-and-hydrated molecule-network restricts water invasion and boosts stress transfer of the nanofiber-network by serving as interfibrous bridge. Overall, the molecule-network makes the membrane hydrated and flexible; the nanofiber-network as stress-bearing component provides strength and *** HCH dual-scale network featuring a cooperative effect stimulates the design of advanced biomaterials applied under wet conditions such as guided bone regeneration membranes.

关键词： bioinspiration heterogeneous crosslink-and-hydration dual-scale network nanocomposite membrane wet mechanical properties guided bone regeneration

Klinefelter综合征的内分泌功能紊乱(文献综述)

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中华内分泌代谢杂志 1985年第1期01卷 59-64页

作者：史轶蘩首都医院内分泌科

Klinefelter综合征(KS)是一组性染色体异常引起的男性性功能低减综合征。此病于1942年由Klinefelter首先描述。1957年Ferguson-Smith发现患者性染色质阳性,1959年Jacob及Strong证实其核型为47,XXY,KS患者核型的主要特征是染色体较正常... 详细信息

Klinefelter综合征(KS)是一组性染色体异常引起的男性性功能低减综合征。此病于1942年由Klinefelter首先描述。1957年Ferguson-Smith发现患者性染色质阳性,1959年Jacob及Strong证实其核型为47,XXY,KS患者核型的主要特征是染色体较正常男性多1个或1个以上的X染色体,大多为47,XXY,约20％为46,XY/47,XXY嵌合体,少数为其他变异型或嵌合体。

关键词：内分泌功能紊乱 KS FSH 血浆胰岛素 Klinefelter 患者 LHRH 综合征综合病症正常男性肾上腺皮质青春前期甲状腺功能减低男性乳腺增生额外染色体超数染色体