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Internal force and deformation matrixes and their applications in load path

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第8期11卷 563-570页

作者： Qi CHEN Xin-jian kou yan-meng ZHANG Department of Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

This paper deals with the internal force and the deformation matrixes, both of which can be used to analyze the topological relationship of a structure. Based on the reciprocal theorem, the relationship between the two matrixes is established, which greatly simplifies the computation of the internal force matrix. According to the characteristics of the internal force matrix, the transfer law of the matrix itself (due to the removal of components) is established based on the principle of linear superposition. With the relation of the two matrixes, the transfer law of the deformation matrix is also obtained. The transfer law illuminates the change regularity of internal force or deformation of the remnant structure when certain members are cut off one after another. The results of numerical examples show that the proposed methods are correct, reliable and effective.

关键词： Truss structure Redundancy Robustness Topological relationship of structure Removal of members Transfer law

A novel epoxy methacrylate resin containing phthalazinone moiety for UV coatings

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Chinese Chemical Letters 2007年第5期18卷 598-600页

作者： yan kou Jin yan Wang Xi Gao Jian Department of Polymer Science and Materials Dalian University of TechnologyLiaoning High Performance Resin Engineering Research Center Dalian 116012 China

A novel ohthalazinone modified epoxy acrylate resin for the high temperature resistant ultravioet （UV） curable *** *** methacrylated epoxy resins obtained were utilized to UV radiation curing by taking 2.5% （wt%） of photoinitiator in combination with 20% （wt%） of diluent, and generated the interpenetraring polymer networks. The cured film had good thermal and chemical stability.

关键词： UV curable Epoxy acrylate Phthalazione Crosslinking

High-performance sandwiched hybrid solid electrolytes by coating polymer layers for all-solid-state lithium-ion batteries

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Rare Metals 2021年第11期40卷 3175-3184页

作者： Zhi-yan kou yan Lu Chang Miao Jie-Qiong Li Cheng-Jin Liu Wei Xiao College of Chemistry and Environmental Engineering Yangtze UniversityJingzhou 434023China School of Mechanical MaterialsMechatronic and Biomedical EngineeringAustralian Institute for Innovative MaterialsInstitute for Superconducting and Electronic MaterialsUniversity of WollongongWollongongNSW 2522Australia

Poly(vinylidenefluoride-co-hexafluoropropylene)(P(VDF-HFP))/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)/P(VDFHFP) sandwiched hybrid solid electrolytes were precisely tailored and successfully fabricated to assemble into allsolid-state lithium-ion batteries,which were systematically evaluated on microstructure,morphology,thermal stability and electrochemical *** sandwiched hybrid solid electrolytes can achieve intimate contact with cathode and anode electrodes to present an excellent interfacial ***,the sandwiched hybrid solid electrolytes possess flexible surface,wide electrochemical working window of 4.7 V,high ionic conductivity of 0.763 mS·cm^(-1) and high thermal stability of 460℃,which may contribute to realizing the practical application in all-solid-state lithium-ion *** assembled cells with the hybrid solid electrolytes can quickly stabilize at a specific discharge capacity of 145.4 mAh·g^(-1) at 0.1 C after only 5 cycles and present admirable rate *** addition,morphology characterizations of the sandwiched hybrid solid electrolytes after long-term cycles show a relatively integrated structure coating with a compact LATP *** investigations afford a promising strategy that the sandwiched hybrid solid electrolytes can overcome the mechanical limitations of the interface between electrodes and inorganic solid electrolytes to provide favorable properties for all-solid-state lithium-ion batteries.

关键词： Sandwiched hybrid solid electrolytes Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3) Polymer layer All-solid-state lithium-ion batteries

Application of unified protocol as a transdiagnostic treatment for emotional disorders during COVID-19: An internet-delivered randomized controlled trial

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World Journal of Clinical Cases 2022年第24期10卷 8599-8614页

作者： kou yan Mohammad Hassan Yusufi Nabi Nazari School of Humanities and Education Xi'an Eurasia UniversityXi'an 710065Shaanxi ProvinceChina Education Administration Bamyan UniversityBamyan 22502Afghanistan Department of Psychology Faculty of Human SciencesLorestan UniversityKhorramabadLorestanIran

BACKGROUND The coronavirus disease 2019(COVID-19)pandemic has been an emotionally challenging time,especially for young *** is associated with a substantial increase in the prevalence of mental health problems,negative symptoms,and stressful experiences that compromise *** low-income countries,internet-delivered psychological services could have a remarkable impact on the population’s mental health,given the lack of mental health *** To investigate the efficacy of internet-delivered cognitive-behavior therapy(CBT)-transdiagnostic intervention for adults with emotional *** In this internet-delivered randomized controlled trial,102 students with an emotional disorder(mean age=28.20 years,standard deviation=5.07)were randomly allocated to receive unified protocol(UP)(n=51)or treatment as the usual *** a semi-structured clinical interview,participants completed an online survey including the Overall Anxiety Severity and Impairment Scale,Overall Depression Severity and Impairment Scale,Difficulties in Emotion Regulation Scale,Positive and Negative Affect Schedule,and Emotional Style *** The participants showed a high degree of *** total,78%(n=40)of the experimental group participants completed the UP *** the intention to treat procedure,the results of the analysis of covariance indicated that participants who received UP showed statistically significant changes in depression symptoms[Cohen’s d=-1.50 with 95%confidence interval(CI):-1.90 to-1.10],anxiety(Cohen’s d=-1.06 with 95%CI:-1.48 to-0.65),difficulties with emotion regulation(Cohen’s d=-0.33 with 95%CI:-0.7 to-0.06),positive affect(Cohen's d=1.27 with 95%CI:0.85 to 1.68),negative affect(Cohen’s d=-1.04 with 95%CI:-1.46 to-0.63),and healthy emotionality(Cohen’s d=0.53 with 95%CI:0.09 to 0.13)compared with the control *** This study’s findings highlight the potential value of transdiagnostic interne

关键词： Unified protocol COVID-19 Internet-delivered Emotion regulation Transdiagnostic Depression Anxiety

Spatiotemporal phase change materials for thermal energy long-term storage and controllable release

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Journal of Energy Chemistry 2023年第5期80卷 228-236,I0006页

作者： yangeng Li yan kou Keyan Sun Jie Chen Chengxin Deng Chaohe Fang Quan Shi Thermochemistry Laboratory Liaoning Province Key Laboratory of Thermochemistry for Energy and MaterialsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China College of Petroleum Engineering Liaoning Petrochemical UniversityFushun 113000LiaoningChina CNPC Research Institute of Petroleum Exploration&Development Bejing 100083China

Phase change materials(PCMs)have attracted much attention in the field of solar thermal utilization recently,due to their outstanding thermal energy storage ***,PCMs usually release their stored latent heat spontaneously as the temperature below the phase transition temperature,rendering thermal energy storage and release uncontrollable,thus hindering their practical application in time and ***,we developed erythritol/sodium carboxymethylcellulose/tetrasodium ethylenediaminetetraacetate(ERY/CMC/EDTA-4Na)composite PCMs with novel spatiotemporal thermal energy storage properties,defined as spatiotemporal PCMs(STPCMs),which exhibit the capacity of thermal energy long-term storage and controllable *** results show that the composite PCMs are unable to lose latent heat due to spontaneous crystallization during cooling,but can controllably release thermal energy through cold crystallization during *** cold-crystallization temperature and enthalpy of composite PCMs can be adjusted by proportional addition of EDTA-4Na to the *** the mass fractions of CMC and EDTA-4Na are both 10%,the composite PCMs can exhibit the optical coldcrystallization temperature of 51.7℃ and enthalpy of 178.1 J/*** supercooled composite PCMs without latent heat release can be maintained at room temperature(10-25℃)for up to more than two months,and subsequently the stored latent heat can be controllably released by means of thermal triggering or heterogeneous *** findings provide novel insights into the design and construction of new PCMs with spatiotemporal performance of thermal energy long-term storage and controllable release,and consequently open a new door for the development of advanced solar thermal utilization techniques on the basis of STPCMs.

关键词： Phase change materials Long-term thermal storage Controllable release Erythritol

Synthesis and Characterization of Dual Acidic Ionic Liquids

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Chinese Chemical Letters 2005年第12期16卷 1563-1565页

作者： Xiao Hua WANG Guo Hong TAO Zi yan ZHANG Yuan kou State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871

Novel ionic liquids with dual acidity, of which the cation contains Brφnsted acidity and anions contain Lewis acidity were synthesized. These ionic liquids obtained were identified by NMR, FF-IR, SDT and FAB-MS. Thei... 详细信息

关键词： Ionic liquids functional dual acidity synthesis characterization

Perivascular epithelioid cell tumors of the liver misdiagnosed as hepatocellular carcinoma:Three case reports

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World Journal of Clinical Cases 2023年第2期11卷 426-433页

作者： yan-Qi kou Yu-Ping yang Wei-Xiang Ye Wei-Nan Yuan Shen-Shen Du Biao Nie Department of Gastroenterology The First Affiliated Hospital of Jinan UniversityGuangzhou 510630Guangdong ProvinceChina Department of Gastrointestinal Endoscopy The First Affiliated Hospital of Jinan UniversityGuangzhou 510630Guangdong ProvinceChina

BACKGROUND Hepatic perivascular epithelioid cell neoplasms(PEComas)are *** and treatment experience with hepatic PEComa remains *** SUMMARY Three hepatic PEComa cases are reported in this paper:One case of primary malignant hepatic PEComa,one case of benign hepatic PEComa,and one case of hepatic PEComa with an ovarian mature cystic *** preoperative imaging and pathological assessment of intraoperative frozen samples,patients were diagnosed with hepatocellular carcinoma(HCC),while postoperative pathology and immunohistochemistry subsequently revealed hepatic *** with hepatic PEComa which is misdiagnosed as HCC often require a wider surgical *** is easy to mistake them for distant metastases of hepatic PEComa and misdiagnosed as HCC,especially when it’s combined with tumors in other *** patients eventually underwent partial *** 1-4 years of follow-up,none of the patients experienced recurrence or *** A clear preoperative diagnosis of hepatic PEComa can reduce the scope of resection and prevent unnecessary injuries during surgery.

关键词： Perivascular epithelioid cell neoplasms Hepatocellular carcinoma Case report Diagnoses Coexistence

Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers:Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties

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Chinese Journal of Polymer Science 2024年第8期42卷 1093-1102页

作者： Qing-Yun Lu Hong-Wei Gu Jia-Hui Li Qian-Qian Fan Bei-Tao Liu yan kou Xi-Gao Jian Zhi-Huan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartment of Polymer Science&EngineeringDalian University of TechnologyDalian 116024China Thermochemistry Laboratory Liaoning Province Key Laboratory of Thermochemistry for Energy and MaterialsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Toughening the petroleum-based epoxy resin blends with bio-based modifiers without compromising their modulus,mechanical strength,and other properties is still a big challenge in view of the *** this study,a bio-based liquid crystal epoxy resin(THMT-E P)with an s-triazine ring structure was utilized to modify a petroleum-based bisphenol A epoxy resin(E51)with 4,4'-diaminodiphenylsulfone(DDS)as a curing agent,and the blended systems were evaluated for their thermal stability,mechanical properties,and flame *** results showed that the impact strength of the blended system initially increased and then decreased with the increase in THMT-EP content,and it reached the a maximum value of 26.5 kJ/m^(2)when the THMT-EP content was 5%,which was 31.2%higher than that of E51/***,the flexural strength,modulus,and glass transition tem perature of the blended system were all simultaneously improved with the addition of *** the same time,the addition of THMT-EP enhanced the flame retardancy of the system by increasing the char yield at 700℃and decreasing the peak heat release rate and total heat release *** work paves the way for a more sustainable improvement in the comprehensive performance of epoxy resin.

关键词： Epoxy resin Toughening Bio-based Thermotropic liquid crystal

A Thermoregulatory Flexible Phase Change Nonwoven for All‑Season High‑Efficiency Wearable Thermal Management

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Nano-Micro Letters 2023年第2期15卷 259-270页

作者： Hanqing Liu Feng Zhou Xiaoyu Shi Keyan Sun yan kou Pratteek Das yangeng Li Xinyu Zhang Srikanth Mateti Ying Chen Zhong‑Shuai Wu Quan Shi Liaoning Province Key Laboratory of Thermochemistry for Energy and Materials Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China Institute for Frontier Materials Deakin UniversityWaurn PondsVIC 3216Australia University of Chinese Academy of Sciences 19 A Yuquan RoadShijingshan DistrictBeijing 100049People’s Republic of China

Phase change materials have a key role for wearable thermal management,but suffer from poor water vapor permeability,low enthalpy value and weak shape stability caused by liquid phase leakage and intrinsic rigidity of solid–liquid phase change ***,we report for the first time a versatile strategy for designed assembly of high-enthalpy flexible phase change nonwovens(GB-PCN)by wet-spinning hybrid grapheneboron nitride(GB)fiber and subsequent impregnating paraffins(e.g.,eicosane,octadecane).As a result,our GB-PCN exhibited an unprecedented enthalpy value of 206.0 J g^(−1),excellent thermal reliability and anti-leakage capacity,superb thermal cycling ability of 97.6%after 1000 cycles,and ultrahigh water vapor permeability(close to the cotton),outperforming the reported PCM films and fibers to ***,the wearable thermal management systems based on GB-PCN for both clothing and face mask were demonstrated,which can maintain the human body at a comfortable temperature range for a significantly long ***,our results demonstrate huge potential of GB-PCN for human-wearable passive thermal management in real scenarios.

关键词： Phase change materials Graphene Boron nitride Nonwoven Wearable thermal management