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排序方式: 共有5457条查询结果,搜索用时 390 毫秒
261.
CongZhan Liu YiFei Zhang XuFang Li XueFeng Lu Zhi Chang ZhengWei Li AiMei Zhang YongJie Jin HuiMing Yu Zhao Zhang MinXue Fu YiBao Chen JianFeng Ji YuPeng Xu JingKang Deng RenCheng Shang GuoQing Liu FangJun Lu ShuangNan Zhang YongWei Dong TiPei Li Mei Wu YanGuo Li HuanYu Wang BoBing Wu YongJie Zhang Zhi Zhang ShaoLin Xiong Yuan Liu Shu Zhang HongWei Liu YiJung Yang Fan Zhang 《中国科学:物理学 力学 天文学(英文版)》2020,(4):20-34
The Insight-Hard X-ray Modulation Telescope(Insight-HXMT) is a broadband X-ray and γ-ray(1-3000 ke V) astronomy satellite. One of its three main telescopes is the High Energy X-ray telescope(HE). The main detector plane of HE comprises 18 Na I(Tl)/Cs I(Na) phoswich detectors, where Na I(Tl) is used as the primary detector to measure ~ 20-250 ke V photons incident from the field of view(FOV) defined by collimators, and Cs I(Na) is used as the active shielding detector to Na I(Tl) by pulse shape discrimination. Additionally, Cs I(Na) is used as an omnidirectional γ-ray monitor. The HE collimators have a diverse FOV,i.e. 1.1°×5.7°(15 units), 5.7°×5.7°(2 units), and blocked(1 unit). Therefore, the combined FOV of HE is approximately5.7°×5.7°. Each HE detector has a diameter of 190 mm resulting in a total geometrical area of approximately 5100 cm2, and the energy resolution is ~15% at 60 ke V. For each recorded X-ray event by HE, the timing accuracy is less than 10 μs and the deadtime is less than 10 μs. HE is used for observing spectra and temporal variability of X-ray sources in the 20-250 ke V band either by pointing observations for known sources or scanning observations to unveil new sources. Additionally, HE is used for monitoring the γ-ray burst in 0.2-3 Me V band. This paper not only presents the design and performance of HE instruments but also reports results of the on-ground calibration experiments. 相似文献
262.
Study on the cationic modification and dyeing of ramie fiber 总被引:2,自引:0,他引:2
Zhao-Tie Liu Yani Yang Lili Zhang Zhong-Wen Liu Heping Xiong 《Cellulose (London, England)》2007,14(4):337-345
A modification procedure for ramie fiber using 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTAC) as a cationic
agent and NaOH as a catalyst was developed in this paper. The morphological and structural transformations of the fiber induced
by modification were determined by XRD (XRD), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA).
XRD results show that the crystal structure of the modified fiber was still preserved although its crystallinity was decreased,
which was confirmed from the TGA results. The mechanisms for the modification and dyeing of ramie fiber were analyzed, and
the optimum modification conditions were determined to be the CHPTAC concentration of 30 g L−1, the NaOH concentration of 15 g L−1, the reaction temperature of 50 °C, and the reaction time of 60 min. The raw and the modified fibers were dyed with C.I.
reactive red 2. The K/S values for the cationic modified fiber increased to be three times as high as the unmodified fiber. The dye uptakes increased
greatly with an increase in the nitrogen contents up to 0.4% on the modified fibers. 相似文献
263.
Preparation and surface properties of latexes with fluorine enriched in the shell by silicon monomer crosslinking 总被引:1,自引:0,他引:1
Ping ting Xiong Pei zhi Chen Hong zhi Huang Rong Guan 《European Polymer Journal》2007,43(5):2117-2126
A series of core-shell acrylic copolymer latexes containing fluorine enriched in the shell have been prepared by emulsion polymerization of a variety of hydrocarbon monomers with (perfluoroalkyl)methyl methacrylate and vinyltriethoxysilicone. In the presence of a reactive anionic and a long chain anionic-nonionic emulsifier, the core-shell latexes were prepared and characterized by transmission electron microscopy (TEM) and tapping-mode atomic force microscopy (AFM). From AFM and contact angle measurements, it was observed that the resulting fluorine and silicon-containing acrylic copolymers with surface energy as low as 15.5 mN/m formed a dense and gradient film containing a surface layer with high a fluorine content, and that the fluorinated particles can be fixed on the surface due to the crosslinking reaction of multi-functional silicon monomer even though the fluorinated carbon number was not enough to crystallize. 相似文献
264.
Xiaoliu Li Yongmei Wang Daming Du Zhong Wen Guoxiang Xiong Jiben Meng 《中国科学B辑(英文版)》1997,40(3):270-277
Solid state Michael addition reaction of indole with α, β-unsaturated carbonyl compounds was carried out, by which a series
of compounds containing three different heterocyclic groups binding to one carbon atom were ob-tained. In the presence of
Lewis acid, indole could undergo the solid state condensation reaction with aromatic ketones and aldehydes or quinones. The
solid state reaction showed higher selectivity and yield than solution reaction. The structures of products were identified
by IR,1H NMR, MS. elemental analysis and X-ray crystal analysis. The reac-tion mechanism was also proposed.
Project supported by the National Natural Science Foundation of China 相似文献
265.
266.
NiO/γ-Al2O3催化剂中NiO与γ-Al2O3间的相互作用 总被引:27,自引:0,他引:27
利用溶胶-凝胶法制备了不同含量的 NiO/γ-Al_2O_3催化剂,通过XRD,XPS和 TPR等技术考察了制备方法、NiO含量和焙烧温度对催化剂结构和Ni存在状态的影响,发现溶胶-凝胶法制备的催化剂活性组分NiO与担体γ-Al_2O_3间具有强相互作用.详细地讨论了Ni物种的还原状态与以“Ni~0”为活性中心的催化反应的活性之间的关系.溶胶-凝胶法制备的催化剂经高温焙烧后,Ni以一种类尖晶石结构的固溶体形式存在,这种固溶体态尖晶石可能会抑制Ni的烧结和流失,提高催化剂的稳定性. 相似文献
267.
268.
269.
Yongjin Fang Bu Yuan Guan Deyan Luan Xiong Wen Lou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(23):7821-7825
Metal sulfides have received considerable attention for efficient sodium storage owing to their high capacity and decent redox reversibility. However, the poor rate capability and fast capacity decay greatly hinder their practical application in sodium‐ion batteries. Herein, an elegant multi‐step templating strategy has been developed to rationally synthesize hierarchical double‐shelled nanoboxes with the CoS2 nanosheet‐constructed outer shell supported on the CuS inner shell. Their structure and composition enable these hierarchical CuS@CoS2 nanoboxes to show boosted electrochemical properties with high capacity, outstanding rate capability, and long cycle life. 相似文献
270.
Zhenguang Wang Chuanchuan Zhang Henggang Wang Yuan Xiong Xinjian Yang Yu‐e Shi Andrey L. Rogach 《Angewandte Chemie (International ed. in English)》2020,59(25):9997-10002
Sulfur is not normally considered a light‐emitting material, even though there have been reports of a dim luminescence of this compound in the blue‐to‐green spectral region. Now, it is shown how to make red‐emissive sulfur by a two‐step oxidation approach using elemental sulfur and Na2S as starting materials, with a high photoluminescence quantum yield of 7.2 %. Polysulfide is formed first and is partially transformed into Na2S2O3 in the first step, and then turns back to elemental S in the second step. The elevated temperature and relatively oxygen‐deficient environment during the second step transforms Na2S2O3 into Na2SO3 incorporated with oxygen vacancies, thus resulting in the formation of a solid‐state powder consisting of elemental S embedded in Na2SO3. It shows aggregation‐induced emission properties, attributed to the influence of oxygen vacancies on the emission dynamics of sulfur by providing additional lower energy states that facilitate the radiative relaxation of excitons. 相似文献