检索结果-南通市图书馆

Production of a large area diffuse arc plasma with multiple cathode

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第2期26卷 320-326页

作者： Cheng Wang Hai-Chao Cui Wan-Wan Li Meng-Ran Liao wei-Luo xia wei-dong xia Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei 230031 China

An arc channel at atmospheric pressure tends to shrink generally. In this paper, a non-transferred DC arc plasma device with multiple cathode is introduced to produce a large area arc plasma at atmospheric pressure. This device is comprised of a 42-mm diameter tubular chamber, multiple cathode which is radially inserted into the chamber, and a tungsten anode with a nozzle in its center. In argon/helium atmosphere, a large area and circumferential homogenous diffuse arc plasma, which fills the entire cross section surrounded by the cathode tips, is observed. Results show that the uniformity and stability of diffuse arc plasma are strongly related to the plasma forming gas. Based on these experimental results, an explanation to the arc diffusion is suggested. Moreover, the electron excitation temperature and electron density measured in diffuse helium plasma are much lower than those of constricted arc column, which indicates the diffuse helium plasma probably deviates from the local thermodynamic equilibrium state. Unlike the common non-transferred arc plasma devices, this device can provide a condition for axial-fed feedstock particles. The plasma device is attempted to spheroidize alumina powders by using the central axis to send the powder. Results show that the powder produced is usually a typical hollow sphere.

关键词： multiple cathode diffuse arc plasma plasma spheroidization

Study on the Promotion of Wound Healing in Mice with Burn Injuries by Bioactive Glass 1393

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Biomedical Engineering(English Edition) 2024年第1期33卷 9-16,26页

作者： xia wei-dong XU Ke ZHENG Chao-yu CHEN Xue-nan National Clinical Key Specialty(Wound Repair Department) Wenzhou Medical University Affiliated First HospitalWenzhou Zhejiang 325000China Institute of Life Sciences Wenzhou UniversityWenzhou Zhejiang 325000China Wuhan University of Science and Technology School of Medicine Wuhan Hubei 430000China

Objective:To investigate the effect and mechanism of bioactive glass1393 on wound healing in mice with burn ***:A benchtop temperature-controlled scald instrument was used to establish a mouse burn wound model,which was divided into an injury group(simple scald group)and a bioactive glass 1393treatment *** wound healing of burn injuries in mice was observed at different times after the operation,and the formation of granulation tissue,collagen deposition and tissue proliferation in the wounds were observed by HE staining,Masson staining and Ki67 staining,and the levels of apoptosis-related proteins and the expression of wnt3a/β-catenin signaling pathway were detected in the wounds by Western ***:Compared with the injury group,the bioactive glass 1393 group accelerated burn wound healing and promoted granulation tissue formation,collagen deposition,and cell *** addition,compared with the injury group,the bioactive glass 1393 group promoted the expression of Bcl-2 protein,inhibited the expression of Bax protein and up-regulated the expression of Wnt3a andβ-catenin ***:Bioactive glass 1393 promotes burn wound healing in mice by inhibiting apoptosis through modulation of wnt3a/β-catenin signaling pathway.

关键词： bioactive glass 1393 wound healing apoptosis

Effects of casting current on structure and properties of a nanostructured Zr-Cu-Fe-Al bulk metallic glass

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第6期25卷 630-636页

作者： Si-nan Liu wei-xia dong Chen-yu Lu Zhu-wei Lu Jia-cheng Ge Chen-chen Yuan Bao-an Sun Tao Feng Xun-li Wang Si Lan Herbert Gleiter Institute of Nanoscience School of MaterialsScience and Engineering Nanjing University of Science andTechnology Nanjing 210094 Jiangsu China Department of Physics City University of Hong KongHong Kong China School of Materials Science and Engineering SoutheastUniversity Nanjing 211189 Jiangsu China

The effects of casting currents on the thermophysical behaviors, atomic and nanoscale structure, and mechanical properties of two Zr-based-bulk metallic glasses, i.e., Zr59Cu33A18 and Zr59（Cuo.55Feo.45）33A18, were studied by using differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering, as well as compression tests. The casting currents can be tuned to change the casting initiative temperature. Results revealed that there is no anomalous structural change for the Zr59Cu33A18 molten liquid before crystallization during cooling with different casting currents. In contrast, liquid-state phase separation was suggested to occur in the Zr59（Cuo.55Feo.45）33A18 molten liquid prepared using lower casting current before crystallization during cooling. The position shift of the first sharp diffraction peak for the diffraction pattern of Zr59（Cuo.55Feo.45）33A18 shows that the density of the molten liquid may decrease upon cooling at different casting currents. The small-angle X-ray scattering results indicate that the heterogeneity of the Zr59（Cuo.55- ***）33A18 metallic glasses increases with decreasing the casting temperature. As a result, the metallic glasses with a liquid-state phase separation possess better mechanical properties, including higher-yielding stress and more significant compressive ductility. The increase in degree of heterogeneity formed by nanoscale liquid-state phase separation and their interactions with the shear bands for the Zr-Cu-Fe-Al bulk metallic glasses were suggested to be responsible for the enhanced mechanical properties.

关键词： Bulk metallic glass Liquid-state phase separation Wide-angle X-ray diffraction Small-angle X-rayscattering Structure heterogeneity

Phase selection rule of high-entropy metallic glasses with different short-to-medium-range orders

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

Rare Metals 2022年第6期41卷 2021-2027页

作者： Hui-Qiang Ying Si-Nan Liu Zhen-Duo Wu wei-xia dong Jia-Cheng Ge Horst Hahn Virgil Provenzano Xun-Li Wang Si Lan School of Materials Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing 210094China Center for Neutron Scattering and Applied Physics City University of Hong Kong Dongguan Research InstituteDongguan 523000China Department of Physics City University of Hong KongHong Kong 999077China Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany

When an equiatomic multi-component alloy is quenched from its molten state down to room temperature,either a solid solution crystalline alloy or a metallic glass is *** former is called a high-entropy alloy,whereas the latter is referred as a high-entropy metallic glass(HE-MG).In such multicomponent alloys,thermodynamic parame-ters,e.g.,the mixing entropy,the mixing enthalpy and other parameters such as atomic size mismatch,determine the resulting phases.

关键词： alloy entropy metallic

在线全文

学校读者我要写书评

暂无评论

短弧氙灯光谱特性及其在太阳模拟器中应用

光谱学与光谱分析 2012年第6期32卷 1447-1450页

作者：李倩王城查俊夏维东中国科学技术大学热科学与能源工程系安徽合肥230027

短弧氙灯作为标准光源得到了广泛的应用,但是空间光谱分布的不均匀性限制了其进一步的发展。通过对短弧氙灯轴向光谱分布的测量,电弧温度分布的计算,初步得到温度与电流密度的关系,认为可以通过控制弧电流密度改善氙灯光谱辐照度分布。

关键词：短弧氙灯光谱分布图太阳模拟器失配误差 Bartels方法

在线全文

学校读者我要写书评

暂无评论

“制科”指代考析

杭州师范大学学报（社会科学版） 2016年第2期38卷 115-120页

作者：夏卫东杭州师范大学人文学院浙江杭州311121

制科是中国古代的一项官员选拔制度,"制科"一词的文献指代含义与制科制度是有所区别的。在唐宋时期,该词指代一般意义上的制科;明清时期则主要指代"进士科",偶尔也指代制科制度。造成这一现象的根源,在于元明以后很少采用制科考试以及... 详细信息

制科是中国古代的一项官员选拔制度,"制科"一词的文献指代含义与制科制度是有所区别的。在唐宋时期,该词指代一般意义上的制科;明清时期则主要指代"进士科",偶尔也指代制科制度。造成这一现象的根源,在于元明以后很少采用制科考试以及进士科融合了制科的一些考试内容。

关键词：制科进士科官员选拔

在线全文

学校读者我要写书评

暂无评论

政治符号:辛亥革命与近代国共关系

杭州师范大学学报（社会科学版） 2015年第1期37卷 127-136页

作者：夏卫东杭州师范大学人文学院浙江杭州311121

辛亥革命在近代国共关系中具有特殊的政治象征意义。国共两党曾分别从各自政治理论的角度来诠释辛亥革命的成败得失,并为自己的政治行为寻求理论上的合法性。在国共第一次合作时期,中共以辛亥革命的失败来论证反帝反封建的必要性,并把... 详细信息

辛亥革命在近代国共关系中具有特殊的政治象征意义。国共两党曾分别从各自政治理论的角度来诠释辛亥革命的成败得失,并为自己的政治行为寻求理论上的合法性。在国共第一次合作时期,中共以辛亥革命的失败来论证反帝反封建的必要性,并把国民党"清党"后的行为视为对辛亥革命事业的背叛;国民党在国共合作初期,也认可了中共对辛亥革命的解释,国共两党由此在反帝反封建的问题上达成了一致;国民党在国共第一次合作破裂以后,则将"北伐"视作辛亥革命的连续。抗战时期,国共两党都从辛亥革命中汲取理论养分,宣扬各自的抗战理念:国民党偏重用辛亥革命的历史来宣扬"抗战建国",突出自己对辛亥精神的继承;中共则以辛亥革命的教训,强调抗战到底、加强统一战线。抗战结束以后,国共两党都力图按照自己的政治学说改造中国,冲突最终变成全面内战。中共正式提出中国共产党是辛亥精神的继承者,必须继承辛亥革命未竟事业,要将反帝反封建进行到底。由于中共正确把握了辛亥革命的真谛,因此最终完成了中国近代反帝反封建的历史任务。

关键词：辛亥革命国共关系反帝反封建政治符号

Stabilizing effect of plasma discharge on bubbling fluidized granular bed

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第7期24卷 288-292页

作者：胡茂彬党赛超马强夏维东 School of Engineering Science University of Science and Technology of China

Fluidized beds have been widely used for processing granular materials. In this paper, we study the effect of plasma on the fluidization behavior of a bubbling fluidized bed with an atmospheric pressure plasma discharger. Experiment results show that the bubbling fluidized bed is stabilized with the discharge of plasma. When the discharge current reaches a minimum stabilization current Cms, air bubbles in the bed will disappear and the surface fluctuation is completely suppressed.A simplified model is proposed to consider the effect of electric Coulomb force generated by the plasma. It is found that the Coulomb force will propel the particles to move towards the void area, so that the bubbling fluidized bed is stabilized with a high enough plasma discharge.

关键词： plasma fluidized bed granular matter stabilization effect

在线全文

学校读者我要写书评

暂无评论

清代乡试阅卷的制度缺陷

杭州师范大学学报（社会科学版） 2008年第2期30卷 84-87页

作者：夏卫东杭州师范学院人文学院浙江杭州310036

从清代乡试阅卷官员的任用程序和政府对阅卷时间的限定这两个角度,分析由于考官素质得不到保证及阅卷时间的紧迫,决定了科举制度下阅卷结果不可能做到真正的公正。

关键词：清代科举制度制度缺陷