检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 1998年第5期17卷 365-371页

作者： HE Ling-Jie CHEN Bo CAI Su-Hua WANG Yan-Ming ZHOU Wen-Bo ZHANG Lin-Na (Fujnin Institute of Research on the Structure of Matter,the Chinese Academy of Sciences, Fuzhou, Fujian 350002, China)xie qing-shan (Present address:Shishi Organizing Committee ,Sh Fu Jian Inst. Res. Struct. of Matter Chinese Academy of Sciences Fuzhou Fu jian 350002 China Shishi Organizing Committee Shishi Fujian 362000 China

The reaction behaviors of the title complexes have been studied in thesystem of dinitrogen gas by means of in situ IR. It has been found that some activefragments created at some stage of the thermal decomposition process of the *** acetic acid both obtained from the ligand of the complexes and introducedfrom outside to convert to acetone by decarboxylation. Their optimum reaction temperatures are of 240~270℃ for [Fe2MnO(O2CCH3),(H2O)3], 290~320 C for [Fe3Q(O2CCH3)6(H2O)3], 300~330℃ for [Fe2CoO(O2CCH3),(H2O)3] and 320~ 350℃for [Fe2NiO(O2CCH3)6(H2O)3], indicating the lowering sequence of the activity of active species. At the same time it has been shown that this activity may come from thejoined contributions of both the coordinating capability of the hetero-metals in the complexes and their structural factors. On the basis of the TGA, DTA and EI-MS data,the composition of the active fragments has been tentatively inferred as [Fe2MnO(O2CCH3)3-2].

关键词： in situ IR carboxylato complexes iron complexes manganese complexes cobalt complexes nickel complexes

在线全文

学校读者我要写书评

暂无评论

蓄热式高温空气燃烧技术的应用(2)

工业加热 2000年第4期29卷 5-8页

作者：吴道洪谢善清杨泽耒北京神雾科技有限公司北京100083

3蓄热式高温空气燃烧技术的推广应用1998年,全国的钢产量达1.14亿t,全国冶金行业的加热炉达千座以上,年处理钢坯上亿t,目前我国轧钢加热炉吨钢平均能耗为60 kg标煤,国际先进水平的加热炉吨钢平均燃料单耗为51kg标煤.

关键词：轧钢加热炉蓄热式加热炉空气燃烧高温

在线全文

学校读者我要写书评

暂无评论

蓄热式高温空气燃烧技术的应用

工业加热 2000年第3期29卷 1-3页

作者：吴道洪谢善清杨泽耒北京神雾科技有限公司北京100083

简述了蓄热式高温空气燃烧技术的原理、技术优势以及应用前景 ,着重介绍我国在蓄热式高温空气燃烧技术领域的基础研究进展及应用情况。

关键词：蓄热室蓄热式高温空气燃烧炉膛锅炉

在线全文

学校读者我要写书评

暂无评论

荧光素及四碘荧光素水溶液产氢的光化学研究

感光科学与光化学 1986年第3期 49-54页

作者：毕只初解庆山俞稼镛中国科学院感光化学研究所

荧光素水溶液(浓度1×10-4mol/L,pH 12.5)的荧光能为三乙醇胺（TEOA）所猝灭,其规律符合Stern-Volmer方程。荧光素的单重激发态的猝灭产物,荧光素的还原态,能够在氯铂酸钾（K2PtCl6）的存在下还原水产氢。但荧光寿命短（7.0ns）,产氢的... 详细信息

荧光素水溶液(浓度1×10-4mol/L,pH 12.5)的荧光能为三乙醇胺（TEOA）所猝灭,其规律符合Stern-Volmer方程。荧光素的单重激发态的猝灭产物,荧光素的还原态,能够在氯铂酸钾（K2PtCl6）的存在下还原水产氢。但荧光寿命短（7.0ns）,产氢的量子产率只有0.024。四碘荧光素由于有重原子效应,其单重激发态通过系间窜越转变成三重激发态,再和TEOA反应生成还原态去还原水产氢。由于磷光寿命长(～10-3s),产氢的量子产率达0.30。

关键词：四碘荧光素荧光素类指示剂产氢光化学

Relativistic time transfer for a Mars lander:from proper time to Areocentric Coordinate Time

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第10期16卷 45-54页

作者： De-Wang Xu qing-shan Yu Yi xie School of Astronomy and Space Science Nanjing UniversityNanjing 210093China shanghai Key Laboratory of Space Navigation and Position Techniques Shanghai 200030China Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityMinistry of EducationNanjing 210093China

As the first step in relativistic time transfer for a Mars lander from its proper time to the time scale at the ground station, we investigate the transformation between proper time and Areocentric Coordinate Time （TCA） in the framework of IAU Resolutions. TCA is a local time scale for Mars, which is analogous to the Geocentric Coordinate Time （TCG） for Earth. This transformation contains two contributions： inter- hal and external. The internal contribution comes from the gravitational potential and the rotation of Mars. The external contribution is due to the gravitational fields of other bodies （except Mars） in the Solar System. When the （in）stability of an onboard clock is assumed to be at the level of 10-13, we find that the internal contribution is dominated by the gravitational potential of spherical Mars with necessary corrections asso- ciated with the height of the lander on the areoid, the dynamic form factor of Mars, the flattening of the areoid and the spin rate of Mars. For the external contribution, we find the gravitational effects from other bodies in the Solar System can be safely neglected in this case after calculating their maximum values.

关键词： reference systems -- time -- space vehicles

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song xie Zi-Meng Han Hao-Cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li qing-Fang Guan Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

Design of a reconfigurable transcendental function generator

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

The Journal of China Universities of Posts and Telecommunications 2017年第1期24卷 96-102页

作者： Jiang Lin Lü qing xie Xiaoyan shan Rui Deng Junyong School of Electronic Engineering Xi'an University of Posts and Telecommunications Xi'an 710121 China School of Computer Science and Technology Xi'an University of Posts and Telecommunications Xi'an 710 121 China

In order to take into account the computing efficiency and flexibility of calculating transcendental functions, this paper proposes one kind of reconfigurable transcendental function generator. The generator is of a reconfigurable array structure composed of 30 processing elements （PEs）. The coordinate rotational digital computer （CORDIC） algorithm is implemented on this structure. Different functions, such as sine, cosine, inverse tangent, logarithmic, etc., can be calculated based on the structure by reconfiguring the functions of PEs. The functional simulation and field programmable gate array （FPGA） verification show that the proposed method obtains great flexibility with acceptable performance.

关键词： reconfigurable computing reconfigurable transcendental function generator CORDIC array processor

Fractionated Crystallization Kinetics and Polymorphic Homocrystalline Structure of Poly(_(L)-lactic acid)/Poly(_(D)-lactic acid)Blends:Effect of Blend Ratio

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第6期40卷 567-575页

作者： Wang-Kai Xiang qing xie shan-shan Xu Chen-Xuan Sun Cheng-Tao Yu Ying Zheng Peng-Ju Pan State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China

Stereocomplex(SC)crystallization has been an effective way to improve the physical performances of stereoregular ***,the competition between homo and SC crystallizations can lead to more complicated crystallization kinetics and polymorphic crystalline structure in stereocomplexable polymers,which influences the physical properties of obtained ***,we select the medium-molecular-weight(MMW)poly(L-lactic acid)/poly(D-lactic acid)(PLLA/PDLA)asymmetric blends with different PDLA fractions(f_(D)=0.01-0.5)as the model system and investigate the effects of f_(D) and crystallization temperature(T_(c))on the crystallization kinetics and polymorphic crystalline *** observe the fractionated(i.e.,multistep)crystallization kinetics and the formation of peculiar β-form homocrystals(HCs)in the asymmetric blends under quiescent conditions,which are strongly influenced by both f_(D) and T_(c).Precisely,crystallization of β-form HCs is favorable in the MMW PLLA/PDLA blends with high f_(D)(≥0.2)at a low T_(c)(80-100℃).It is proposed that the formation of metastable β-form HCs is attributed to the conformational matching between β-form HCs and SCs,and the stronger constrain effects of precedingly-formed SCs in the early stage of *** effects can also cause the multistep crystallization kinetics of MMW PLLA/PDLA asymmetric blends in the heating process.

关键词： Poly(lactic acid) Stereocomplex crystallization Polymorphic structure Crystallization kinetics

A Novel Model of the H Radical in Hot-Filament Chemical Vapor Deposition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第2期28卷 216-219页

作者： GUO Xiao-Song BAO Zhong ZHANG shan-shan xie Er-qing Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Physical Science and Technology SchoolLanzhou UniversityLanzhou 730000

Amorphous hydrogenated and crystalline silicon thin films were prepared by hot-filament chemical vapor deposition.A structural transformation from amorphous phase to crystalline phase by increasing the filament temperature Tfil from 1600℃ to 1650℃ was *** phenomenon may result from the associated abundance of H radicals participating in the growth of the Silms.A probability distribution model of the H radical is proposed to elucidate this *** to this model,the phase transition is due to a distinct difference in the probability distribution of the H radicals,which seems to be dependent upon Tfil.

关键词： deposition transformation crystalline

Roasting-induced phase change and its influence on phosphorus removal through acid leaching for high-phosphorus iron ore

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

International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 346-352页

作者： Min Yang qing-shan Zhu Chuan-lin Fan Zhao-hui xie Hong-zhong Li State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemistry School of Chemistry and Biological Engineering University of Science and Technology Beijing

In the present study, roasting-induced phase change and its influence on phosphorus removal via leaching has been investigated for high-phosphorus iron ore. The findings indicate that phosphorus in the ore is associated with goethite and exists mainly in amorphous Fe3PO7 phase. The phosphorus remains in the amorphous phase after being roasted below 300℃. Grattarolaite （Fe3PO7） is found in samples roasted at 600-700℃, revealing that phosphorus phase is transformed from the amorphous form to crystalline grattarolaite during roasting. Leaching tests on synthesized pure grattarolaite reveal a low rate of phosphorus removal by sulfiaric acid leaching. When the roasting tem- perature is higher than 800℃, grattarolaite is found to react with alumina to form aluminum phosphate, and the reactivity of grattarolaite with alumina increases with increasing roasting temperature. Consequently, the rate of phosphorus removal also increases with increasing roasting temperature due to the formation of acid-soluble aluminum phosphate.

关键词： goethite phosphorus removal roasting leaching