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In-situ growth and photoluminescence of β-Ga_2O_3 cone-like nanowires on the surface of Ga substrates

science china(Technological sciences) 2009年第6期52卷 1712-1721页

作者： LIU RuiNi1,YANG HeQing1,ZHANG RuiGang1,DONG HongXing1,CHEN XiaoBo1,LI Li1,ZHANG LiHui1,MA JunHu1 & zheng HaiRong2 1 Key Laboratory of Macromolecular science of Shaanxi Province,school of Chemistry and materials science,Shaanxi Normal university,Xi’an 710062,china 2 school of Physics & Information technology,Shaanxi Normal university,Xi’an 710062,china Key Laboratory of Macromolecular science of Shaanxi Province School of Chemistry and Materials Science Shaanxi Normal University Xi’an China school of Physics & Information technology Shaanxi Normal University Xi’an China

β-Ga2O3 cone-like nanowires have been in-situ grown on the surface of gallium grains and films by heating gallium substrates at 750-1000℃ for 2h in *** controllable synthesis of β-Ga2O3 nano-wires with different diameters and lengths was achieved by adjusting the heating temperature and *** as-synthesized products were characterized by means of X-ray diffraction,scanning electron mi-croscopy and transmission electron *** results showed that the β-Ga2O3 nanowires are single crystalline with a monoclinic structure and have a controllable diameter and length in the range of 30-100nm and 0.5-1.5μm,respectively.A possible mechanism was also proposed to account for the formation of β-Ga2O3 cone-like *** spectra of the β-Ga2O3 nanowires obtained at different temperatures were measured at room temperature,and a strong blue photolumi-nescence with peaks at 430 and 460nm and a weak red photoluminescence with peak at 713nm were *** blue light emission intensity decreases with increasing the reaction temperature,how-ever,the red light emission intensity hardly *** blue and red light emissions originate from the recombination of an electron on an oxygen vacancy with a hole on a gallium-oxygen vacancy pair and the nitrogen dopants,etc.,respectively.

关键词： β-Ga2O3 cone-like nanowires photoluminescence in-situ growth

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Numerical Investigation on Heat Transfer Characteristics of Microencapsulated Phase Change Material Slurry in a Rectangular Minichannel

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Journal of Thermal science 2024年第2期33卷 564-577页

作者： WANG Zhibin LI Zilong JIA Lisi ding Bin CHEN Ying school of materials and Energy Guangdong University of TechnologyGuangzhou510006China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangzhou510006China College of New Energy China University of Petroleum(East China)Qingdao266580China

Microencapsulation phase change material slurry(MEPCMS) becomes a potential working fluid for cooling high energy density miniaturized components,thanks to the latent heat absorption of particles in the heat transfer *** this work,the Discrete Phase Model(DPM) based on the Euler-Lagrangian method is used to numerically investigate the convective heat transfer characteristics of MEPCMS flowing through a rectangular minichannel with constant heat *** results show that particles of MEPCMS are mainly subjected to drag force during the *** so,they can migrate from the high-temperature region to the low-temperature region driven by the thermophoretic force,affecting the particle distribution and phase change ***,the Nux of the MEPCMS fluctuates due to particle phase change with varying specific heat ***,the value increases first,then decreases,and eventually increases again until it approaches the fully developed value of the pure base fluid as the particles gradually ***,the heat transfer performance of the MEPCMS is influenced by the combination of fluid inlet temperature fluid inlet velocity(v),and mass concentration(c_(m)) of MEPCM *** result shows that the maximum reduction of the maximum bottom wall temperature difference(ΔT_(w)) is 23.98% at T_(in)=293.15 K,v=0.15 m·s^(-1),c_(m)=10%.

关键词： Microencapsulated Phase Change Material Slurry(MPCMS) Discrete Phase Model(DPM) particle-fluid interaction force minichannel heat sink thermophoresis

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An effective catalyst carrier SiO_(2):Enhancing catalytic and combustion properties of CuFe_(2)O_(4)on energetic components

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Defence technology（防务技术） 2024年第2期32卷 383-392页

作者： Li ding Chong Wan Suhang Chen Zhao Qin Kangzhen Xu school of Chemical Engineering/Xi'an Key Laboratory of Special Energy materials Northwest UniversityXi'an710069China Xi’an Modern Chemistry Research Institute Xi'an710065China

To enhance the catalytic activity of copper ferrite(CuFe_(2)O_(4))nanoparticle and promote its application as combustion catalyst,a low-cost silicon dioxide(SiO_(2))carrier was employed to construct a novel CuFe_(2)O_(4)/SiO_(2)binary composites via solvothermal *** phase structure,morphology and catalytic activity of CuFe_(2)O_(4)/SiO_(2)composites were studied firstly,and thermal decomposition,combustion and safety performance of ammonium perchlorate(AP)and 1,3,5-trinitroperhydro-1,3,5-triazine(RDX)with it affecting were then systematically *** results show that CuFe_(2)O_(4)/SiO_(2)composite can remarkably either advance the decomposition peak temperature of AP and RDX,or reduce the apparent activation energy at their main decomposition ***,the flame propagation rate of RDX was promoted by about 2.73 times with SiO_(2)content of 3 wt%,and safety property of energetic component was also improved greatly,in which depressing the electrostatic discharge sensitivity of pure RDX by about 1.89 *** addition,the effective range of SiO_(2)carrier content in the binary catalyst is found to be 3 to 5 wt%.Therefore,SiO_(2)opens a new insight on the design of combustion catalyst carrier and will promote the application of CuFe_(2)O_(4)catalyst in solid propellant.

关键词： Copper ferrite Silicon dioxide Combustion catalyst Thermal decomposition Laser ignition

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The precipitation strengthening behavior of Cu-rich phase in Nb contained advanced Fe-Cr-Ni type austenitic heat resistant steel for USC power plant application

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Progress in Natural science:materials International 2012年第3期22卷 175-185页

作者： Cheng-yu Chi a, Hong-yao Yu b, Jian-xin Dong b, Wen-qing Liu c, Shi-chang Cheng d, zheng-dong Liu d, Xi-shan Xie b a school of Metallurgical and Ecological Engineering, university of science & technology beijing, beijing 100083, china b school of materials science and Engineering, university of science & technology beijing, beijing 100083, china c Instrumental Analysis & Research Center, Shanghai university, Shanghai 200444, china d Central Iron and Steel Research Institute, beijing 100081, china school of Metallurgical and Ecological Engineering University of Science & Technology Beijing Beijing 100083 China school of materials science and Engineering University of Science & Technology Beijing Beijing 100083 China Instrumental Analysis & Research Center Shanghai University Shanghai 200444 China Central Iron and Steel Research Institute Beijing 100081 China

Copper has been used as a strengthening element in newly developed Fe-Cr-Ni type austenitic heat resistant steel for inducing Cu-rich phase precipitation to meet high temperature strength requirement for 600 ℃ Ultra Super-Critical (USC) coal fired power plants for many years. However, the precipitation behavior and strengthening mechanism of Cu-rich phase in these advanced austenitic heat resistant steels is still unclear. In order to understand the precipitation strengthening behavior of Cu-rich phase and to promote high strength austenitic heat resistant steel development, 18 Cr9 NiCuNb steel which is a Cu-added Nb contained advanced Fe-Cr-Ni type austenitic heat resistant steel has been selected for this study to be aged at 650 ℃ till to 10,000 h. Micro-hardness and room temperature tensile test were conducted after long-time aging. SEM, TEM, HRTEM and three dimensional atom probe (3DAP) technology accompanying with thermodynamic calculation have been used to investigate the Cu-rich phase precipitation behavior during 650 ℃ aging. The experimental results showed that Cu atoms can quickly concentrate in clusters at very early precipitation stage to form the fine nano-size Cu-rich "segregation areas" within less than 1 h at 650 ℃. With increasing aging time at 650 ℃ Cu atoms continuously concentrate to Cu-rich segregation areas (clusters) and simultaneously other kinds of atoms such as Fe, Cr and Ni diffuse away from Cu-rich segregation areas to austenitic matrix, and finally to complete the transformation from Cu-rich segregation areas to Cu-rich phase. However, there is only Cu atoms concentration but not crystallographic transformation from early stage of Cu-rich clusters forming to the final Cu-rich phase formation. Even the Cu atom becomes the main composed element after 500 h aging at 650 ℃ the Cu-rich phase still keeps coherent relationship with austenitic matrix. According the experimental results in this study, Cu-rich phase precipitation sequence which st

关键词： USC power plant Austenitic heat resistant steel Microstructure Cu-rich phase TEM 3DAP

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Electrochemical Method for Evaluating the Passivated State of Medical StainlessSteel 317L

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International Journal of Minerals,Metallurgy and materials 2000年第2期14卷 135-138页

作者： Lin Zhang Baofeng ding Yinshun Wu X. Wang Bei Cao Baofen Qi Fengmei Ren(Material science and Engineering school, university of science and technology beijing, beijing 100083, china)(Tianjin Medical Instrument Inspection Center, Tianjin 300191, china Material science and Engineering school University of Science and Technology Beijing Beijing 100083 China Tianjin Medical Instrument Inspection Center Tianjin 300191 China

The electrochemical behavior of the medical Stainless steel 317L which is used as in vivo fixation materials has been investigated at different passivated states in several candidate-testing solutions. The potentiodynamic scanning polarizaion technique was employed to measure the polarizaion curves of 317L in 0.9%NaCl solution at 37℃. The results showed that the electrochemical behaviorin 0.9% NaCl solution at 37℃ and in 2% NaCl solotion at 30℃ can be better used to detect and evaluate passivated states and corrosionresistance of 317L. In addition,the pitting potential Eb can be used as a criterion and itS lower limit could be 0.85 V(SEC) for this system.

关键词： stainless steel 317L passivation pitting potential, electrochemica1 method

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Whisker Orientation Function and Elastic Modulus of the as-cast 20% SiC_W/Mg Composite

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Rare Metals 2001年第4期20卷 270-274页

作者： Chuanhai Jiang1, Jiansheng Wu1, Mingyi zheng2, Dezun Wan 2 1) Key Laboratory for High Temperature materials and Tests of the Ministry of Education, Shanghai Jiaotong university. Shanghai 200030, china 2) school of materials science and Engineering, Harb 上海交通大学教育部高温材料及高温测试重点实验室上海 200030 哈尔滨工业大学黑龙江哈尔滨 150001

The relationship between the plane-orientation function and the space-orientation function of whiskers in whisker-reinforced metal matrix composites was analyzed theoretically. The actual orientation of whiskers in the as-cast 20%SiCw/Mg composite (SiCw content in volume fraction) were investigated, and the elastic modulus of the composite was measured with an ultrasonic velocity analyzer. Results show that there is an evident difference between the plane-orientation function and the space-orientation function of whiskers and the space-orientation function can represent the actual condition of the composite. Only by using the space-orientation function of whiskers, the difference of elastic modulus of the as-cast composite in different directions can be explained reasonably.

关键词： SiC whisker Mg composite whisker orientation elastic modulus

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The influence of impurity on the critical thickness of the CeO_2 buffer layer for coated conductors

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 993-996页

作者： PAN Min1, HUANG zheng2, MA HuanFeng2, QIANG WeiRong2, WEI LianFu1, WANG Long2 & Zhao Yong1,3 1 Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of china), Superconductivity R&D Center (SRDC), Southwest Jiaotong university, Chengdu 610031, china 2 school of Physical science and technology, Southwest Jiaotong university, Chengdu 610031, china 3 Superconductivity Research Group, school of materials science and Engineering, university of New South Wale, Sydney, 2052 NSW, Australia Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of china) Superconductivity R&D Center (SRDC) Southwest Jiaotong University Chengdu China school of Physical science and technology Southwest Jiaotong University Chengdu China Superconductivity Research Group School of Materials Science and Engineering University of New South Wale Sydney Australia

The lattice parameters, band structure, density of state and elastic constant of RE-doped CeO2 (RE=Sm, Gd, Dy), the buffer material for coated HTS conductors, are calculated using the plane-wave method with pseudopotentials based on the density functional theory (DFT) of first-principle. The rule and mechanism of the effect of rare earth impurity on the critical thickness of the CeO2 buffer layer are investigated. It is found that, in the range of the calculation, the changes of the lattice volume V and elastic constant E of CeO2 with the impurity are mainly determined by the increased electrons ne of the system. The relationship of the elastic constant E and increased electrons ne is established. It is indicated that the critical thickness of the CeO2 single buffer layer doped with Sm, Gd, and Dy may be enhanced by 22%, 43% and 33%, respectively.

关键词： CeO2 first principle critical thickness elastic constants

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First-line camrelizumab(a PD-1 inhibitor)plus apatinib(an VEGFR-2 inhibitor)and chemotherapy for advanced gastric cancer(SPACE):a phase 1 study

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Signal Transduction and Targeted Therapy 2024年第4期9卷 1760-1767页

作者： Xiaofeng Chen hao Xu Xiaobing Chen Tongpeng Xu Yitong Tian Deqiang Wang Fen Guo Kangxin Wang Guangfu Jin Xiao Li Rong Wang Fengyuan Li Yongbin ding Jie Tang Yueyu Fang Jing Zhao Liang Liu Ling Ma Lijuan Meng Zhiguo Hou Rongrong zheng Yang Liu Ni Guan Bei Zhang Shuang Tong Shiqing Chen Xing Li Yongqian Shu Department of Oncology The First Affiliated Hospital with Nanjing Medical UniversityNanjingChina Gusu school Nanjing medical UniversitySuzhouChina Jiangsu Key Lab of Cancer Biomarkers Prevention and TreatmentCollaborative Innovation Center for Cancer Personalized MedicineNanjing Medical UniversityNanjingChina Department of General surgery The First Affiliated Hospital with Nanjing Medical UniversityNanjingChina Department of Oncology Henan Cancer Hospital Affiliated Cancer Hospital of Zhengzhou UniversityZhengzhouChina Henan Engineering Research Center of Precision Therapy of Gastrointestinal Cancer&zhengzhou Key Laboratory for Precision Therapy of Gastrointestinal Cancer ZhengzhouChina Department of Oncology Digestive Disease Institute&Cancer Institute of Jiangsu UniversityAffiliated Hospital of Jiangsu UniversityZhenjiangChina Department of Oncology Suzhou Hospital of Nanjing Medical UniversitySuzhouChina Department of Oncology Nanjing PuKou People’s HospitalNanjingChina Department of Epidemiology School of Public HealthNanjing Medical UniversityNanjingChina Department of Pathology The First Affiliated Hospital with Nanjing Medical UniversityNanjingChina Department of general surgery Jurong Branch hospital of Jiangsu Province People HospitalJurongChina Department of Medical Oncology Liyang People’s HospitalLiyangChina Department of radiology Nanjing PuKou People’s HospitalNanjingChina Jiangsu Hengrui Pharmaceuticals ShanghaiChina Department of Medical Affairs 3D Medicines Inc.ShanghaiChina Shanghai OrigiMed Co. Ltd.ShanghaiChina

Patients with advanced gastric cancer typically face a grim *** phase 1a(dose escalation)and phase 1b(dose expansion)study investigated safety and efficacy of first-line camrelizumab plus apatinib and chemotherapyfor advanced gastric or gastroesophageal junction *** primary endpoints included maximum tolerated dose(MTD)in phase 1a and objective response rate(ORR)across phase 1a and *** 1a tested three dose regimens of camrelizumab,apatinib,oxaliplatin,and *** regimen 1:camrelizumab 200 mg on day 1,apatinib 250 mg every other day,oxaliplatin 100 mg/m^(2) on day 1,and S-140 mg twice a day on days *** regimen 2:same as dose regimen 1,but oxaliplatin 130mg/*** regimen3:same as dose regimen 2,but apatinib 250 mg ***-four patients were included(9 in phase 1a,25 in phase 1b).No dose-limiting toxicities occurred so no MTD was *** 3 was set for the recommended phase 2 doses and administered in phase *** confrmed ORR was 76.5%(95%CI 58.8-89.3).The median progression-free survival was 8.4 months(95%CI 5.9-not evaluable[NE]),and the median overall survival(OS)was not mature(11.6-NE).Ten patients underwent surgery after treatment and the multidisciplinary team *** 24 patients without surgery,the median OS was 19.6 months(7.8-NE).Eighteen patients(52.9%)developed grade≥3 treatment-emergent adverse *** plus apatinib and chemotherapy showed favorable clinical outcomes and manageable safety for untreated advanced gastric cancer(ChiCTR2000034109).

关键词： regimen cancer doses

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Preparation and Enhanced Daylight-Induced Photo-Catalytic Activity of Transparent C-Doped TiO_2 Thin Films

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Journal of Wuhan university of technology(materials science) 2010年第5期25卷 738-742页

作者：白爱英 College of materials science and Engineering Taiyuan University of Technology Xin Zhou Vocational Technical College

The transparent C-doped TiO2 nanostructure films were fabricated on the silicate glass substrates by sol-gel spin-coated method. The as-prepared films were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, UV-visible absorption spectra （UV-vis） and X-ray photoelectron spectroscopy （XPS）. The photocatalytic activity was evaluated via the photocatalytic oxidation of methylene blue in aqueous under daylight irradiation at room temperature. The results show that the daylight-induced photocatalytic activities of the as-prepared films are improved by the C-doping. The calcination temperatures significantly affect the morphology, microstructure and photocatalytic activity of the as-prepared samples. At 723 K, the C-doped TiO2 films exhibit the highest photocatalytic activity due to the synergetic effects of good crystallization, appropriate oxygen vacancies and strong absorption in the near UV and visible-light region.

关键词： C-doped TiO2 films daylight-induced photocatalytic activity spin-coated

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Steric hindrance modulation of hexaazatribenzanthraquinone isomers for high-capacity and wide-temperature-range aqueous proton battery

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National science Review 2024年第4期11卷 271-282页

作者： Mingsheng Yang Yuxin hao Bei Wang Yan Wang Liping zheng Rui Li Huige Ma Xinyu Wang Xiaoming Jing Hongwei Li Mengxiao Li Zhihui Wang Yujie Dai Guangcun Shan Mingjun Hu Jun Luo Jun Yang school of materials science and Engineering Beihang University beijing Institute of Nanoenergy &Nanosystems Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science & TechnologyGuangxi University school of Chemistry and Chemical Engineering Center on Nanoenergy Research Guangxi University school of Instrumentation science and Opto-electronics Engineering Beihang University ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of China

Organic materials with rich active sites are good candidates of high-capacity anodes in aqueous batteries,but commonly low utilization of active sites limits their ***,two isomers,symmetric and asymmetric hexaazatribenzanthraquinone（s-HATBAQ and a-HATBAQ）,with rich active sites have been synthesized in a controllable *** has been revealed for the first time that a sulfuric acid catalyst can facilitate the stereoselective formation of *** to the reduced steric hindrance in favor of proton insertion as well as the amorphous structure conducive to electrochemical dynamics,s-HATBAQ exhibits 1.5 times larger specific capacity than ***,the electrode of s-HATBAQ with50% reduced graphene oxide（s-HATBAQ-50%rGO） delivers a record high specific capacity of405 mAh g-1in ***,the assembled MnO2//s-HATBAQ-50%rGO aqueous proton full batteries show an exceptional cycling stability at 25℃ and can maintain ～92% capacity after1000 cycles at 0.5 A g-1at-80℃.This work demonstrates the controllable synthesis of isomers,showcases a wide-temperature-range prototype proton battery and highlights the significance of precise mole cular structure modulation in organic energy storage.

关键词： stereoisomers steric effect aqueous battery super cycling stability ultra-low temperature proton battery

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