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Elevation of the Power Factor of Co4Sb12 Skutterudite with Sm-Doping in High-Pressure High-Temperature Synthesis

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Chinese Physics Letters 2010年第6期27卷 237-239页

作者： jiaNG Yi-Ping jia xiao-peng GUO Wei XU Hui-Wen DENG Le ZHENG Shi-Zhao MA Hong-An National Lab of Superhard Materials Jinlin University Changchun 130012 Department of Physics Beihua University Jilin 132013

A thermoelectric material Smx Co4Sb12 （0（ x ≤1.0） is synthesized at high pressure and high temperature leading to an enhanced power factor. The experimental measurements show that the SmxCo4Sb12 compounds exhibits n-type conduction. The absolute value of the Seebeck coefficient decreases with increasing Sm fraction. The resistivity increases with samarium content x from 0.1 to 0.2, but decreases dramatically when x changes from 0.2 to 1.0. The maximum power factor reaches 13.1 μ***^-1K-2 at x =1.0, which is larger than the data previously reported for the La-doped CoSb3 prepared at room pressure.

关键词： ELECTRIC power factor COBALT compounds SKUTTERUDITE SEMICONDUCTOR doping HIGH pressure (Science) HIGH temperatures INORGANIC compounds -- Synthesis THERMOELECTRIC materials

Synthesis and Magnetotransport Properties of CrO_(2)-TiO_(2) Composites

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Chinese Physics Letters 2013年第3期30卷 154-157页

作者： FAN Yin-Bo ZHANG Cai-Ping DU xiao-Bo WEN Ge-Hui MA Hong-An jia xiao-peng State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012 College of Physics Jilin UniversityChangchun 130012

CrO_(2)-TiO_(2) composites are synthesized by using a high temperature and high pressure method using CrO_(3) and H_(2)TiO_(3) as *** composites consist of large rod-like CrO_(2) crystals separated by small TiO_(2) *** CrO_(2) in the composites is very pure and its saturation magnetization is very close to the theoretical value(i.e.,2μ_(B) per formula unit).The composites exhibit a large negative magnetoresistance(MR)at 5 *** MR in CrO_(2)-TiO_(2) composites is mainly attributed to spin-polarized tunneling between CrO_(2) *** conductivity of the composites is best described by a fluctuation-induced tunneling model below 230 K.

关键词： composites CrO2 tunneling

Reaction Mechanism of Al and N in Diamond Growth from a FeNiCo-C System

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Chinese Physics Letters 2011年第6期28卷 315-317页

作者： LI Shang-Sheng LI xiao-Lei MA Hong-An SU Tai-Chao xiao Hong-Yu HUANG Guo-Feng LI Yong ZHANG Yi-Shun jia xiao-peng School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454003 State Key Lab of Superhard Materials Jilin UniversityChangchun 130012 Luoyang Institute of Science and Technology Luoyang 471023

It is significant to investigate the action of nitrogen getters,which are used to synthesize type-IIa large diamond single crystals under high pressure and high temperature(HPHT).The reaction mechanism of Al as a nitrogen getter and N in the HPHT alloy solvent is still indeterminate at *** order to investigate the reaction of Al and N in the HPHT alloy solvent,Al and AlN are respectively added to the system of Fe55Ni29Co16−C(wt%,***-C)for the synthesis of diamonds at about 5.5 GPa and 1600 *** concentration of nitrogen in the diamonds is characterized by a micro Fourier transform infrared(micro-FTIR)*** experimental results show that cN decreases when Al is added to the FeNiCo-C ***,it increases when AlN is added.A reversible reaction confirms that Al and N can react and form AlN,simultaneously AlN can be decomposed into Al and N in the HPHT alloy *** the mechanism of eliminating the nitrogen of nitrogen getter Al is realized in detail.

关键词： alloy FeNiCo mechanism

An Effective Solution for the Best Set of Beveling Parameters of the Cubic High-Pressure Tungsten Carbide Anvil

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Chinese Physics Letters 2012年第11期29卷 162-164页

作者： HAN Qi-Gang ZHANG Qiang LI Ming-Zhe jia xiao-peng LI Yue-Fen MA Hong-An Roll-forging Research Institute Jilin UniversityChangchun 130025 National Lab of Superhard Materials Jilin UniversityChangchun 130012 College of Earth Sciences Jilin UniversityChangchun 130061

Determining the best set of beveling parameters is an advantageous characteristic of the geometrical conditions for a cubic high-pressure tungsten carbide(WC)anvil,but it is almost impossible to deduce experimentally(much affected by defects in the material).In order to remove the affection of defects in materials,we investigate computational stress analyses in different beveling parameters of WC anvils by the finite element *** results indicate that the rate of cell pressure transmitting and failure crack in the WC anvil monotonically increases with the bevel angle from 42°to 45°.Furthermore,there are two groups of actual users of beveled anvils,one group preferring 41.5°,which can decrease the rate of failure crack in WC anvil,the other group preferring 42°,which can increase the rate of cell pressure *** work would give an effective solution to solve the problem of the design of a cubic high-pressure WC anvil experimentally and will greatly help to improve the cubic high-pressure WC anvil type high pressure techniques.

关键词： crack carbide cubic

Transformation of Nitrogen State in High-Level N-Doped Gem-Quality Diamond Crystal Annealed at High Temperature and High Pressure

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Chinese Physics Letters 2012年第10期29卷 151-154页

作者： HUANG Guo-Feng jia xiao-peng MA Hong-An BAI Hong-Bo YIN Ji-Wen HU Yi-Ga Department of Physics and Electronic Information Engineering Chifeng CollegeChifeng 024000 National Lab of Superhard Materials Jilin UniversityChangchun 130012

The colourless IaA-type gem-quality diamond crystals containing a high concentration of nitrogen(1500–1700 ppm)were successfully prepared by annealing the as-grown Ib-type N-doped diamonds at a high temperature and high pressure in China-type cubic anvil high-pressure *** were carried out at pressures of 6.5–7.0 GPa and temperatures from 1900 K to 2100 *** treatment on high-level N-doped diamond crystals shows that the colour of the diamond crystals is obviously reduced from green to colourless after annealing treatment within 1 h at a higher temperature,which is induced by nitrogen aggregation in the diamond lattice indicated by infrared(IR)*** is further revealed that active energy of the nitrogen atom transforming from the dispersed form to the aggregated form is much lower than that in the standard Ib-type diamond crystals with nitrogen concentration less than 300 *** colourless IaA-type diamond crystal prepared by annealing at 2100 K displays the same properties in IR spectra as the high-quality natural diamonds which are classified into the IaA type.

关键词： annealing treatment Transformation

Hypoxic Mesenchymal Stem Cells Promote Diabetic Wound Healing in Rats by Increasing VEGF Secretion

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Biomedical and Environmental Sciences 2023年第8期36卷 756-759页

作者： ZHUANG Su Jing SUN Xu Yan LUO Meng WANG Zhong ZHANG Xue Juan GAO Zong Sheng LIU jian LIU Xin Ran LIU Shi Ze jia xiao peng Shandong Qilu Stem Cell Engineering Co.LTD Jinan 250102ShandongChina

Diabetes mellitus is a global public health concern affecting an estimated 537 million people,and patients with diabetes are more susceptible to developing chronic wounds^([1,2]).The wound healing process is often affected by various factors,including infection,tissue hypoxia,necrosis,exudates,and excessive inflammatory cytokines^([3]).Presently,there is no effective treatment for refractory wound healing,and the development of new techniques and therapeutic strategies is urgently required for patients with diabetes who have chronic wounds.

关键词： healing wound patients

Information tracing model based on PageRank

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网络与信息安全学报 2017年第8期3卷 68-76页

作者： LI Qian LAI jia-wei xiao Yun-peng WU Bin Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications Chongqing Engineering Laboratory of Network and Information Security Chongqing University of Posts and Telecommunications

In social network, original publisher and important nodes in the diffusion process can be traced by analyzing the spreading network of a hot topic. The participated users and spreading network structure of a hot topic build an information tracing model, which mines the source and important diffusion nodes. Firstly, it analyzed the development trend of a hot topic and extracts the users involved. Secondly, it established a user network according to the following relationship of the users involved. Thirdly, the contribution rate of users on the development of the hot topic was initialized, and the Page Rank algorithm was used to construct the information tracing model. Finally, the Top k users were selected as the information publisher and important users of the hot topic according to the contribution rate. Experimental results showed that our model can effectively discover the hot topic of the publisher and important users.

关键词：计算机网络网络管理应用程序信息安全

Thermoelectric Properties of Te-Doped Ba_(0.32)Co_(4)Sb_(12-x)TexPrepared at HPHT

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Chinese Physics Letters 2011年第4期28卷 235-237页

作者： REN Guo-Zhong LIU Yang MA Hong-An SU Tai-Chao LIN Le-Jing DENG Le jiaNG Yi-Ping ZHENG Shi-Zhao jia xiao-peng Faculty of Materials Optoelectronics and PhysicsXiangtan UniversityXiangtan 411105 National Lab of Superhard Materials Jinlin UniversityChangchun 130012

Polycrystalline skutterudites Ba_(0.32)Co_(4)Sb_(12-x)Tex(nominally x=0.1-0.7)are synthesized by the high pressure and high temperature(HPHT)*** influence of Te substitution on electrical transport properties are investigated in the temperature range of *** the samples show n-type *** is found that the presence of Te substantially decreases electrical resistivi by without any detrimental effect on the Seebeck coefficients,which improves the power *** all the samples,Ba_(0.32)Co_(4)Sb_(11.5)Te_(0.5)shows the highest thermoelectric figure of merit of 0.76 at 710K.

关键词： electrical

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失速改出伞阻力特征面积估算方法

飞行力学 2017年第2期35卷 69-71页

作者：贾晓鹏中国飞行试验研究院飞机所陕西西安710089

研究了高平尾布局飞机的气动特性。使用失速改出伞是飞机改出深失速的重要途径,但如何确定失速改出伞的关键参数(阻力面积等)却没有现成的方法。以ARJ21-700飞机为例,分别使用公式分析法、类比法综合估算出失速改出伞的关键参数,通过模... 详细信息

研究了高平尾布局飞机的气动特性。使用失速改出伞是飞机改出深失速的重要途径,但如何确定失速改出伞的关键参数(阻力面积等)却没有现成的方法。以ARJ21-700飞机为例,分别使用公式分析法、类比法综合估算出失速改出伞的关键参数,通过模型自由飞和模拟仿真分析验证其具有足够效能将飞机改出深失速状态。形成了一套新机失速改出伞的设计方法和关键数据图表,可供其他型号飞机失速改出伞的设计研制使用。

关键词：失速改出伞阻力面积高平尾飞机深失速