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Preparation and Characterization of CA-MA Eutectic/Silicon Dioxide Nanoscale Composite Phase Change Material from Water Glass via Sol-Gel Method

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Journal of Wuhan University of Technology(Materials Science) 2017年第5期32卷 1048-1056页

作者：孟多 zhao kang zhao Wei JIANG Guowei School of Civil and Architectural Engineering Liaoning University of Technology Jinzhou 121001 China

This work mainly involved the preparation of a nano-scale form-stable phase change material（PCM） consisting of capric and myristic acid（CA-MA） binary eutectic acting as thermal absorbing material and nano silicon dioxide（nano-SiO_2） serving as the supporting material. Industrial water glass for preparation of the nano silicon dioxide matrix and CA-MA eutectic mixture were compounded by single-step sol-gel method with the silane coupling agent. The morphology, chemical characterization and form stability property of the composite PCM were investigated by transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, Fourier-transform infrared（FT-IR） spectroscopy and polarizing microscopy（POM）. It was indicated that the average diameter of the composite PCM particle ranged from 30-100 nm. The CA-MA eutectic was immobilized in the network pores constructed by the Si-O bonds so that the composite PCM was allowed no liquid leakage above the melting temperature of the CA-MA eutectic. Differential scanning calorimetry（DSC） and thermogravimetric analysis（TGA） measurement were conducted to investigate the thermal properties and stability of the composite PCM. From the measurement results, the mass fraction of the CA-MA eutectic in the composite PCM was about 40%. The phase change temperature and latent heat of the composite were determined to be 21.15 ℃ and 55.67 J/g, respectively. Meanwhile, thermal conductivity of the composite was measured to be 0.208 W·m^（-1）·K^（-1） by using the transient hot-wire method. The composite PCM was able to maintain the surrounding temperature close to its phase change temperature and behaved well in thermalregulated performance which was verified by the heat storage-release experiment. This kind of form-stable PCM was supposed to complete thermal insulation even temperature regulation by the dual effect of relatively low thermal conductivity and phase change thermal storage-release properties. So it can be formulated that the nanos

关键词： fatty acid eutectic silicon dioxide nanoscale composite phase change material water glass sol-gel

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Role of triggering receptor expressed on myeloid cells 1/2 in secondary injury after cerebral hemorrhage

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World Journal of Clinical Cases 2025年第9期13卷 1-12页

作者： Fan Yi Hao Wu Hai-kang zhao Xi’an Medical University Xi’an 710021Shaanxi ProvinceChina Department of Neurosurgery The Second Affiliated Hospital of Xi’an Medical UniversityXi’an 710038Shaanxi ProvinceChina

Intracerebral hemorrhage(ICH)is a common severe emergency in neurosurgery,causing tremendous economic pressure on families and society and devastating effects on patients both physically and psychologically,especially among patients with poor functional *** is often accompanied by decreased consciousness and limb *** seriously affects patients’ability to live *** rapid advances in neurosurgery have greatly improved patient survival,there remains insufficient evidence that surgical treatment significantly improves long-term *** in-depth pathophysiological studies after ICH,increasing evidence has shown that secondary injury after ICH is related to long-term prognosis and that the key to secondary injury is various immune-mediated neuroinflammatory reactions after *** basic and clinical studies of various systemic inflammatory diseases,triggering receptor expressed on myeloid cells 1/2(TREM-1/2),and the TREM receptor family is closely related to the inflammatory *** inflammatory diseases can be upregulated and downregulated through receptor *** the TREM receptor functions after ICH,the types of results from intervention,and whether the outcomes can improve secondary brain injury and the long-term prognosis of patients are *** analysis of relevant research results from basic and clinical trials revealed that the inhibition of TREM-1 and the activation of TREM-2 can alleviate the neuroinflammatory immune response,significantly improve the long-term prognosis of neurological function in patients with cerebral hemorrhage,and thus improve the ability of patients to live independently.

关键词： Cerebral hemorrhage Secondary injury Triggering receptor expressed on myeloid cells 1/2 Neurosurgery Inflammatory response

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Coordinated optimization for controlling short circuit current and multi-infeed DC interaction

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Journal of Modern Power Systems and Clean Energy 2014年第4期2卷 374-384页

作者： Dong YANG kang zhao Yutian LIU State Grid Shandong Electric Power Research Institute Jinan 250002China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China

Due to increased penetration of renewable energies,DC links and other emerging technologies,power system operation and planning have to cope with various uncertainties and *** order to solve the problems of exceeding short circuit current and multi-infeed DC interaction,a coordinated optimization method is presented in this ***,a branch selection strategy is proposed by analyzing the sensitivity relationship between current limiting measures and the impedance ***,the impact of network structure changes on the multi-infeed DC system is *** the coordinated optimization model is established,which considers the cost and effect of current limiting measures,the tightness of network structure and the voltage support capability of AC system to multiple ***,the non-dominated sorting genetic algorithm II combining with the branch selection strategy,is used to find the Pareto optimal *** studies on a planning power system demonstrated the feasibility and speediness of this method.

关键词： Operation and planning Multiple DC infeed Short circuit current Sensitivity analysis Multi-objective optimization

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Preparation of Triethylene Glycol Maleate and Its Effect on Plasticization of Oxidized Starch

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Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 1167-1173页

作者：程飞 LIN Yi zhao kang 朱谱新 Textile Institute Sichuan University Chengdu 610065 China

A plasticizer triethylene glycol maleate（TEG-MA） was synthesized. The dominated monoester of moderate hydrophobicity with apparent oil-water partition coefficient of 0.042 in the product was confirmed by acid value determination, HPLC and FTIR. Its plasticizing effect on oxidized starch was manifested by crystallization, aging behaviour, moisture absorption, and mechanical performance. X-ray diffraction data showed that the relative crystallinity of the plasticized starch decreased. Both the crystal and the crystallinity of starch films were rarely changed in aging. Moisture absorption relied on the ester content and relative humidity. The elongation at break increased significantly with plasticizer content more than 10% in the matrix.

关键词： starch plasticization triethylene glycol maleic anhydride hygroscopicity

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Sol-gel Derived TiO_2-Bioactive glass-Hydroxyapatite Bioactive Coating on Titanium Alloy Substrate

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Chinese Journal of Mechanical Engineering 2010年第2期23卷 263-268页

作者： zhao kang LUO Defu TANG Yufei ZHANG Dawei School of Materials Science and Engineering Xi＇ an University of Technology Xi＇ an 710048 China School of Materials Science and Engineering Xihua University Chengdu 610039 China Library of Xi＇ an Polytechnic University Xi＇ an 710049 China

Coating the hydroxyapatite （HA） on the titanium alloy surface can obtain a bioactive implant with high mechanical properties However, the bonding force between the titanium alloy and the HA was low due to their different coefficient of thermal expansion （CET）. Preparing the multi-layer coating with alleviated thermal stress on titanium alloy substrate is few reported. Fabrication of a TiO2-bioactive glass （BG）-HA bioactive coating was proposed to solve this problem. A particular TiO2 surface was prepared on the titanium alloy substrate by micro-arc oxidation treatment. The BG and HA coating were coated onto the TiO2 surface in turn by using a sol-gel method. The microstructure, surface morphology and phase composition of the coatings were analyzed. The bonding force of coatings was investigated by the nick apparatus. In vitro dissolution was performed by soaking the TiO2-BG-HA coated samples into the simulated body fluid for various periods. Micro-structural observations indicated that no delamination and crack occurred at the interface of HA/BG and BG/TiO2. The bonding between the substrate and coating consists of the mechanical interaction and the chemical bonding. The bonding force could reach about 45 N. The TiO2-BG-HA coating displayed the excellent forming ability of bone-like apatite when it was soaked into the simulated body fluid. This work suggests an innovative way to reduce the internal stress among coatings through varying BG composition to adjust its CTE, so as to enhance the bonding force.

关键词： bioactive coating sol-gel coefficient of thermal expansion TiO2-BG-HA simulated body fluid

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Preparation and Properties of Paraffin/PMMA Shape-stabilized Phase Change Material for Building Thermal Energy Storage

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 231-239页

作者：孟多 zhao kang WANG Anqi WANG Baomin School of Civil and Architectural Engineering Liaoning University of TechnologyJinzhou 121001China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 10083China Institute of Building Materials Dalian University of TechnologyDalian 116024China

The composite phase change material(PCM) consisting of phase change paraffin(PCP) and polymethyl methacrylate(PMMA) was prepared as a novel type of shape-stabilized PCM for building energy conservation through the method of bulk polymerization. The chemical structure, morphology, phase change temperature and enthalpy, and mechanical properties of the composite PCM were studied to evaluate the encapsulation effect of PMMA on PCP and determine the optimal composition proportion. FTIR and SEM results revealed that PCP was physically immobilized in the PMMA so that its leakage from the composite was prevented. Based on the thermo-physical and mechanical properties investigations, the optimal mass fraction of PCP in the composite was determined as 70%. The phase change temperature of the composite was close to that of PCP, and its latent heat was equivalent to the calculated value according to the mass fraction of PCP in the composite. For estimating the usability in practical engineering, thermal stability, reliability and temperature regulation performance of the composite were also researched by TG analysis, thermal cycling treatments and heating-cooling test. The results indicated that PCP/PMMA composite PCM behaved good thermal stability depending on the PMMA protection and its latent heat degraded little after 500 thermal cycling. Temperature regulation performance of the composite before and after thermal cycling was both noticeable due to its latent heat absorption and release in the temperature variation processes. The PCP/PMMA phase change plate was fabricated and applied as thermal insulator in miniature concrete box to estimate its temperature regulation effect under the simulated environmental condition. It can be concluded that this kind of PCP/PMMA shape-stabilized PCM with the advantages of no leakage, suitable phase change temperature and enthalpy, good thermal stability and reliability, and effective temperature regulation performance have much potentia

关键词： shape-stabilized phase change material phase change paraffin polymethyl methacrylate temperature regulation building energy conservation

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Educating for Wholeness, but Beyond Competences: Challenges to Key-Competences- Based Education in China

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ECNU Review of Education 2020年第3期3卷 470-487页

作者： kang zhao College of Education Zhejiang University

Purpose:This article aims to conduct a critical analysis of key-competences-based education in China today by revealing three main challenges that Chinese educational practitioners,researchers,and policymakers might ***/Approach/Methods:Against the backdrop of international and Chinese policy and the practice of key-competences-based education,this article focuses on a critical discourse analysis of this educational movement in ***:China places great emphasis on the personal,cultural,and moral dimensions in generating a framework of competences,paying considerable attention to the well-being of children;hence it currently endeavors to provide a consistent educational framework to educate the young for the all-round ***,three challenges are salient:the dilemma between Core-Suyang(Core-Competence)and the education for all-round development of the young,the limitations of design of“subject core-competences,”and a lack of consideration of subjectification as purpose of ***/Value:Education which merely focuses on a list of key-competences might not only exclude non-key-competences but also exclude something unforeseen and unknown in the process of educational *** is therefore suggested that a holistic education needs to be engaged in with an encompassing and dynamic view of purpose(s)of education,in which the education for subjectification is at stake in our educational endeavor.

关键词： Curriculum key-competences purpose of education subjectification subjectivity wholeness

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Finite Element Analysis of the Steel Reinforced Plastic Pipe

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Journal of Materials Science & Technology 2003年第Z1期19卷 43-45页

作者： Hongyi SUN Wenqi MA Dachang kang Keding zhao Harbin University of Science and Technology Harbin 150080 China Daqing Oilfields Postdoctoral Workstation Daqing 163453 China Harbin Institute of Technology Harbin 150001 China Daqing Oilfields Postdoctoral Workstation Daqing 163453 China Harbin Institute of Technology Harbin 150001 China Harbin Institute of Technology Harbin 150001 China

The steel reinforced plastic pipe is a kind of green environmental protection pipelines with double-sides corrosionresisting and better withstanding to medium working pressure. The structure and technical process of this pipe are described briefly in this paper, and the finite element analysis has been done for the sake of understanding the distributions of stress and displacement inside this pipe under hydrostatic pressure. The analysis results are very important for safety application of the steel reinforced plastic pipe.

关键词： Steel reinforced plastic pipe, Finite element analysis

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Effect of curing humidity on performance of cemented paste backfill

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International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1046-1053页

作者： Di Wu Run-kang zhao Chao-wu Xie Shuai Liu School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China

Cemented paste backfill(CPB),a mixture of tailings,binder,and water,is widely and extensively used for the recovery of mineral resources,the prevention of ground subsidence,and the management of mine *** installed,the CPB is subjected to complex environmental conditions such as water content,temperature,and power,which have a significant impact on its ***,this study conducts a series of laboratory programs,including investigation of moisture,temperature,stress–strain relation,and microstructure to show the effect of curing humidity on the CPB *** results obtained indicate that ambient humidity can have a dramatic effect on CPB in terms of its macro performance of internal relative humidity,temperature and strength,as well as the micro *** examples of these effects on CPB include an increase in curing humidity,which favors binder hydration,and then an increase in hydration materials,temperature and peak stress in the *** results obtained will lead to a better understanding of CPB’s responses to various environmental conditions.

关键词： cemented paste backfill curing humidity temperature microstructure

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A Hybrid Level Set Optimization Design Method of Functionally Graded Cellular Structures Considering Connectivity

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Computers, Materials & Continua 2024年第4期79卷 1-18页

作者： Yan Dong kang zhao Liang Gao Hao Li The State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan430074China Institute of Systems Engineering China Academy of Engineering PhysicsMianyang621900China

With the continuous advancement in topology optimization and additive manufacturing(AM)technology,the capability to fabricate functionally graded materials and intricate cellular structures with spatially varying microstructures has grown ***,a critical challenge is encountered in the design of these structures–the absence of robust interface connections between adjacent microstructures,potentially resulting in diminished efficiency or macroscopic failure.A Hybrid Level Set Method(HLSM)is proposed,specifically designed to enhance connectivity among non-uniform microstructures,contributing to the design of functionally graded cellular *** HLSM introduces a pioneering algorithm for effectively blending heterogeneous microstructure ***,an interpolation algorithm is presented to construct transition microstructures seamlessly connected on both ***,the algorithm enables the morphing of non-uniform unit cells to seamlessly adapt to interconnected adjacent *** method,seamlessly integrated into a multi-scale topology optimization framework using the level set method,exhibits its efficacy through numerical examples,showcasing its prowess in optimizing 2D and 3D functionally graded materials(FGM)and multi-scale topology *** essence,the pressing issue of interface connections in complex structure design is not only addressed but also a robust methodology is introduced,substantiated by numerical evidence,advancing optimization capabilities in the realm of functionally graded materials and cellular structures.

关键词： Hybrid level set method functionally graded cellular structure connectivity interpolated transition optimization design

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