检索结果-南通市图书馆

Effects of particle size and content of RDX on burning stability of RDXbased propellants

Defence Technology（防务技术） 2022年第7期18卷 1247-1256页

作者： bin-bin wang Xin Liao Luigi T.DeLuca Wei-dong He School of Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China Key Laboratory of Special Energy Materials Ministry of EducationNanjing210094China SPLab Department of Aerospace EngineeringPolitecnico di Milano(RET)MilanI-20156Italy

Particle size and content of RDX are the two main factors that affect the burning stability of RDX-based propellants. However, these effects and the corresponding mechanisms are still controversial. In this work, we investigated the physicochemical processes during burning and the corresponding mechanisms through the technologies of structure compactness analysis on the base of voidage measurement and theoretical interfacial area estimation, apparent burning rate measurement using closed vessel(CV)and extinguished burning surface characterization relying on interrupted closed vessel(ICV) and scanning electron microscope(SEM). The results indicate that the voidage increased with the increase of RDX content and particle size due to the increasing interfacial area and increasing interface gap size,respectively. The apparent burning rate increased with the increase of RDX particle size because of the decreasing RDX specific surface area on the burning surface, which could decrease the heat absorbing rates of the melting and evaporation processes of RDX in the condensed phase. Similarly, the apparent burning rate decreased with the increase of RDX content at pressures lower than around 55 MPa due to the increasing RDX specific surface area. Whereas, an opposite trend could be observed at pressures higher than around 55 MPa, which was attributed to the increasing heat feedback from the gas phase as the result of the increasing propellant energy. For propellants containing very coarse RDX particles, such as 97.8 and 199.4 μm average size, the apparent burning rate increased stably with a flat extinguished surface at pressures lower than around 30 MPa, while increased sharply above around 30 MPa with the extinguished surface becoming more and more rugged as the pressure increased. In addition, the turning degree of u-p curve increased with the increase of coarse RDX content and particle size, and could be reduced by improving the structure compactness.

关键词： RDX particle Size and content Structure compactness Apparent burning rate Extinguished surface Burning stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Particle–hole fluctuations and possible superconductivity in doped α-RuCl_3

引用

Chinese Physics B 2019年第5期28卷 282-287页

作者： bin-bin wang Wei wang Shun-Li Yu Jian-Xin Li National Laboratory of Solid State Microstructures and Department of Physics Nanjing University

We study various particle–hole excitations and possible superconducting pairings mediated by these fluctuations in doped α-RuCl_3 by using multi-band Hubbard model with all t_(2g) orbitals. By performing a random-phase-approximation(RPA) analysis, we find that among all particle–hole excitations, the j_(eff)= 1/2 pseudospin fluctuations are dominant, suggesting the robustness of j_(eff)= 1/2 picture even in the doped systems. We also find that the most favorable superconducting state has a d-wave pairing symmetry.

关键词： superconductivity particle–hole fluctuations spin–orbit coupling α-RuCl3

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chemical Composition Effect on Microstructures and Mechanical Properties in Friction Stir Additive Manufacturing

引用

Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1494-1508页

作者： Jian-Yu Li Shi-Ning Kong Chi-Kun Liu bin-bin wang Zhao Zhang State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116024China

The variation of chemical compositions can affect the mechanical property of friction stir additive manufacturing(FSAM).Quantitative characterization of the relationship between the chemical composition and the mechanical property of FSAM components is key to control the quality of FSAM *** effect of chemical composition on the mechanical property of 6 xxx series aluminum alloy FSAM joint was studied by both experimental and numerical methods.A moving heat source model was established to simulate the heat transfer in FSAM *** average grain size was calculated by Monte Carlo model,and the precipitate evolution model was used to calculate the hardness and constitutive stress-strain *** validity of the numerical model was verified by *** indicate that the hardness and yield stress of 6 xxx series aluminum alloy FSAW joint can be enhanced by increasing silicon or magnesium *** increasing the content of magnesium(silicon),the volume fraction and the mean radius of MgSi can be increased when the content of silicon(magnesium) is *** the decrease in volume fraction,the average grain size can be *** changing the weight percentage of magnesium and silicon in different layers,the hardness and yield stress along the build direction can be controlled.

关键词： Friction stir additive manufacturing Chemical composition Mechanical property Microstructure Numerical model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thickness modulation effect of CeO_2 layer for YBCO films grown by pulsed laser deposition

引用

Rare Metals 2018年第3期37卷 225-231页

作者： Xiang Wu Lin-Fei Liu Yan-Jie Yao Meng-Lin wang bin-bin wang Yi-Jie Li Department of Physics and Astronomy Shanghai Jiao Tong University

CeO2 film plays an essential role in nucleation and growth of YBa2 Cu3 O（7-x）（YBCO） films. In this work,the dependence of superconducting properties of YBCO on CeO2 films with different thicknesses was investigated,in order to achieve fabrication of high-performance YBCO coated conductors in industrial scale. The crystalline structure and morphology of CeO2 films with thickness ranging from 21 to 563 nm were systematically characterized by means of X-ray diffraction（XRD）, atomic force microscope（AFM） and reflection high-energy electron diffraction（RHEED）. Additional focus was addressed on evolution of the surface quality of CeO2 films with thickness increasing. The results show that at the optimal thickness of 221 nm, CeO2 film exhibits sharp in-plane and out-of-plane texture with full width of half maximum（FWHM） values of 5.9° and 1.8°, respectively, and smooth surface with a mean root-mean-square（RMS） roughness value as low as 0.6 nm. Combing RHEED and transmission electron microscope（TEM） cross-sectional analysis, it is found that nucleation and growth of CeO2 films at early stage remain in island growth mode with rougher surface,while further increasing the thickness beyond the optimal thickness leads to weak surface quality, consequently resulting in degradation of superconductor layers deposited subsequently. Eventually, a critical current density（Jc） as high as 4.6×10-6 A·cm-（-2）（77 K, self-field） is achieved on a YBCO film on a thickness-modulated CeO2/MgO/Y2 O3/Al2 O3/C276 architecture, demonstrating the advantages of CeO2 films as buffer layer in high-throughput manufacture of coated conductors.

关键词： CeO2 films Thickness modulation Pulsed laser deposition Surface quality

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of laser scanning speed on microstructure and mechanical properties of Inconel 718 alloys by selective laser melting

引用

China Foundry 2021年第3期18卷 170-179页

作者： Hong-ying wang bin-bin wang Liang wang Ran Cui Liang-shun Luo Yan-qing Su National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Jiamusi UniversityJiamusi 154007China

Inconel 718 alloys were fabricated by selective laser melting under different scanning speeds to investigate the change of the morphology of molten pool,direction of grain growth,and tensile *** show that as the scanning speed increases from 1,000 to 1,450 mm·s^(-1),the ratio between depth and width of molten pool increases,yet their overlapping regimes ***,increasing scanning speed can promote the solidified structure evolve from cell to columnar dendrites,and decrease the dendrite spacing from 0.54 to 0.39 μm;the average columnar grain size also decreases from 84.42 to 73.51 μ*** different scanning speeds,the preferred orientation of grains along the building is mainly *** addition,the tensile properties of samples under different scanning speeds present a non-monotonic *** maximum ultimate tensile strength and elongation can reach 1,014±19 MPa and 19.04±1.12 (%),respectively,at the scanning speed of 1,300 mm·s^(-1).

关键词： selective laser melting(SLM) Inconel 718 molten pool microstructure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Disastrous effects of climate change on High Mountain Asia

引用

Advances in Climate Change Research 2024年第3期15卷 365-366页

作者： Peng CUI Yao-Ming MA Yan wang bin-binwang Institute of Geographic Sciences and Natural Resources Research The Chinese Academy of Sciences(CAS)Beijing 100101China Institute of Mountain Hazards and Environment CASChengdu 610041China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchCASBeijing 100101China

High Mountain Asia(HMA),encompassing the Tibetan Plateau and the surrounding high mountain ranges of the Hindu Kush and Tianshan,is a region characterised by large terrain,complex topography and the interplay of vario... 详细信息

关键词： terrain Tianshan Tibetan

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A New Effect of Oxygen Plasma on Two-Dimensional Field-Effect Transistors:Plasma Induced Ion Gating and Synaptic Behavior

引用

Chinese Physics Letters 2019年第7期36卷 116-120页

作者： Cheng-Lei Guo bin-bin wang Wei Xia Yan-Feng Guo Jia-Min Xue Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 School of Physical Science and Technology ShanghaiTech University Shanghai 201210 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049

Plasma treatment is a powerful tool to tune the properties of two-dimensional materials. Previous studies have utilized various plasma treatments on two-dimensional materials. We find a new effect of plasma treatment. After controlled oxygen-plasma treatment on field-effect transistors based on two-dimensional SnSe2, the capacitive coupling between the silicon back gate and the channel through the 300 nm SiO2 dielectric can be dramatically enhanced by about two orders of magnitude(from 11 n F/cm^2 to 880 nF/cm^2), reaching good efficiency of ionliquid gating. At the same time, plasma treated devices show large hysteresis in the gate sweep demonstrating memory behavior. We reveal that this spontaneous ion gating and hysteresis are achieved with the assistance of a thin layer of water film automatically formed on the sample surface with water molecules from the ambient air, due to the change in hydrophilicity of the plasma treated samples. The water film acts as the ion liquid to couple the back gate and the channel. Thanks to the rich carrier dynamics in plasma-treated two-dimensional transistors, synaptic functions are realized to demonstrate short-and long-term memories in a single device. This work provides a new perspective on the effects of plasma treatment and a facile route for realizing neuromorphic devices.

关键词： Plasma treatment is a powerful two-dimensional materials realizing neuromorphic devices

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Discovery of CCDC188 gene as a novel genetic target for human acephalic spermatozoa syndrome

引用

Protein & Cell 2024年第9期15卷 704-709页

作者： Jing wang Hui-Juan Jin Yi Lu Zi-Han wang Teng-Yan Li Lan Xia Hong-Jun Li bin-bin wang Su-Ren Chen Department of Medical Genetics and Developmental Biology School of Basic Medical SciencesCapital Medical UniversityBeijing 100069China Key Laboratory of Cell Proliferation and Regulation Biology Ministry of EducationDepartment of BiologyCollege of Life SciencesBeijing Normal UniversityBeijing 100875China Graduate School Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100005China Department of Urology Peking Union Medical College HospitalBeijing 100005China Center for Genetics National Research Institute of Family PlanningBeijing 100081China NHC Key Laboratory of Reproductive Health Engineering Technology Research(NRIFP) Beijing 100081China

Dear Editor,Male infertility is a widespread health problem and affects approximately 6%–8%of the male population(Jiao et al.,2021).Acephalic spermatozoa syndrome(ASS),a rare but severe type of teratozoospermia,is ch... 详细信息

关键词： infertility finally

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Three-Body Recombination of Cold^(3)He–^(3)He–T^(-)System

引用

Chinese Physics Letters 2022年第8期39卷 28-33页

作者： Ming-Ming Zhao Li-Hang Li Bo-Wen Si bin-bin wang bina Fu Yong-Chang Han Department of Physics Dalian University of TechnologyDalian 116024China Beijing Institute of Radio Measurement Beijing 100854China Physics and Space Science College China West Normal UniversityNanchong 637009China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116024China

The atom-atom-anion three-body recombination(TBR)and collision induced dissociation(CID)processes of the^(3)He-^(3)He-T^(-)system at ultracold temperatures are investigated by solving the Schr¨odinger equation in the adiabatic hyperspherical *** variations of the TBR and CID rates with the collision energies in the ultracold temperatures are *** is found that the J~Π=1~-symmetry dominates the TBR and CID processes in most of the considered collision energy *** rate of TBR(CID)into(from)the l=1 anion is larger than those for the l=0 and l=2 anions,with the l representing the rotational quantum number of~3HeT~-.This can be understood via the nonadiabatic couplings among the different channels.

关键词： collision anion symmetry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of growth rate on microstructure and microhardness of directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B alloy

引用

China Foundry 2020年第4期17卷 293-300页

作者： Zhi-ping Li Hong-ying Xia Liang-shun Luo bin-bin wang Liang wang Yan-qing Su Jing-jie Guo Heng-zhi Fu National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

The effect of growth rates (V=2-50 μm·s-1) on microstructure and microhardness of directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B (at.%) alloy at a constant temperature gradient (G=18 K·mm-1) was investigated. Results indicated that β phase was the primary phase of the directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B alloy. As the growth rate increases, the solid/liquid interface turns from cellular growth to dendric growth. The interlamellar spacing (λs) decreases with the increase of growth rate according to the relationship of λs=3.39V -0.31. The solidification segregation occurs due to the enrichment of β-stabilizing element Nb, Cr in primary β phase during solidification;moreover, the degree of the segregation increases with the growth rate, resulting in the emergence of B2 phase in lamellar colonies at high growth rates. The microhardness (Hv) grows with the growth rate based on the equation of HV=328.69V 0.072, which mainly attributes to the microstructure refinement.

关键词： beta-solidifying TiAl alloys directional solidification microstructure evolution microstructure control microhardness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：