检索结果-南通市图书馆

Influence of Microwave Radiation on Properties and Structure of Fe_2O_3/SO_4^(2-) Solid Superacid Catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第4期12卷 307-311页

作者： Yinan NING (kunming Institute of Precious Metals, kunming 650221, China)Jiaqiang WANG and Pinjie HONG(yunnan university, kunming 650091, China) yunnan UNIV KUNMING 650091PEOPLES R CHINA

The microwave radiation method was introduced to prepare the Fe_2O_3/SO solid *** structure and properties were investigated by means of X-ray diffraction and infrared spectrum analyses as well as measurement of magnetic susceptibility and rate of esterification. The structure of the superacids prepared in microwave field can be crystalline or non-crystalline, the latter has not been reported yet in literatures. Comparing with the traditional superacid, the non-crystalline Fe2O3/SO superacid prepared in microwave field has the highest magnetic susceptibility and catalytic activity. The di-coordination of Fe2O3 and SO and the S=O bi-bond were reinforced by microwave radiation, which is favorable for increasing the acid intensity of the Fe2O3/SO catalyst

关键词： SO Influence of Microwave Radiation on Properties and Structure of Fe2O3/SO4 Solid Superacid Catalyst Fe

The right dual of left C-rpp semigroups

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第19期42卷 1599-1603页

作者： GUO YuqiDepartment of Mathematics, yunnan university, kunming 650091, China Department of Mathematics Yunnan University Kunming China

SEMIGROUP S is said to be rpp (dually, lpp) if every principal right ideal aS^1(S^1a) of S, re-garded as a right (left)S^1-system, is projective. The semigroup which is both rpp and lpp is said to be abundant. These kinds of generalized regular semigroups have aroused wideattention. The Green’s,relations (~*-Green’s relations introduced by Pastijn) have formed avery useful tool in study on regular (abundant) semigroups. In order to develop the study onrpp semigroups a step further, we introduced the so-called (1)-Green’s,relation which

关键词： rpp semigroups left (right) C-rpp semigroups. (I)-Green’s relations.

The Nature of Bonding in IrC

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第12期9卷 0-0,0-0页

作者： Xiao Guang XIE Huai CAO (Modem Biological Center, yunnan university, kunming 650091)Xian Jun BI (Department of Chemistry, yunnan Normal university, kunming 650092)Shu Shan Dai (Department of Chemistry, yunnan university, Kunndng 650091) yunnan Univ Modern Biol Ctr Kunming 650091 Peoples R China yunnan Normal Univ Dept Chem Kunming 650092 Peoples R China yunnan Univ Dept Chem Kunming 650091 Peoples R China

The nature of bonding in the title compound has been stUdied by using CASSCF andFOCI techniques. The ground state of IrC has been found to be 2△ arising primarilyfrom:.. 1σ2 2σ2 1π4 1δ3 3σ2 configuration, which forms a triple bond between Ir and C atoms (one σ;two π). The lowest quartet state is 4Φ state which has the configuration:... 1σ2 2σ2 1π4 1δ3 2π1 3σ2 andlies higher than the ground state by 1 .25eV. The molecular constants of the ground state calculatedat CASSCF level by using Morse's mode are: Re=1.6904A, De=4.86eV, We=1139cm-1, andB0=0.5219cm-1 comparable with the spectrum values (Re=1 .6858A, De=6.44 eV, We=1051cm-1and B0=0.5251 cm-1).

关键词： Nature of bonding IrC molecular constants CASSCF

CAS-MCSCF Study on the Ground State of the Ditungsten Molecule(W_2)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第4期8卷 347-350页

作者： GUO Liang LI Xue Yan TU Shu Shan DAI(Department of Chemistry, yunnan university, kunming. yunnan 650091) yunnan UNIV DEPT CHEMKUNMING 650091YUNNANPEOPLES R CHINA

Complete active space multiconfiguration self-consisten-field (CAS-MCSCF)calculations are carried out on the ground stae() of W_2. The spectroscopic properties(Re=2.078A. De=4.224eV and ωe=304.3cm-1) and the poential... 详细信息

关键词： CAS-MCSCF Study on the Ground State of the Ditungsten Molecule W2

Regularity of the Attractor for the Dissipative Hamiltonian Amplitude Equation Governing Modulated Wave Instabilities

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2002年第2期18卷 263-272页

作者： Zheng-de DaiDepartment of Mathematics, yunnan university, kunming 650091, China Department of Mathematics Yunnan Normal University Kunming China

In the present paper, the existence of global attractor for dissipative Hamiltonian amplitude equation governing the modulated wave instabilities in E0 is considered. By a decomposition of solution operator, it is sho... 详细信息

关键词： Regularity of Global attractor Hamiltonian amplitude equation

Microstructure Evolution in Laser RS Co-base Metastable Alloy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第5期B4卷 475-480页

作者： WANG Anan CHENG Shunqi GUO Zhiyao (kunming university of Science and Technology,kunming 650093,China)YUN Bo (Micoanalysis Center,yunnan university,kunming 650091,China) yunnan Univ Kunming China

ＭｉｃｒｏｓｔｒｕｃｔｕｒｅＥｖｏｌｕｔｉｏｎｉｎＬａｓｅｒＲＳＣｏ－ｂａｓｅＭｅｔａｓｔａｂｌｅＡｌｌｏｙＷＡＮＧＡｎａｎ；ＣＨＥＮＧＳｈｕｎｑｉ；ＧＵＯＺｈｉｙａｏ（ＫｕｎｍｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅ... 详细信息

ＭｉｃｒｏｓｔｒｕｃｔｕｒｅＥｖｏｌｕｔｉｏｎｉｎＬａｓｅｒＲＳＣｏ－ｂａｓｅＭｅｔａｓｔａｂｌｅＡｌｌｏｙＷＡＮＧＡｎａｎ；ＣＨＥＮＧＳｈｕｎｑｉ；ＧＵＯＺｈｉｙａｏ（ＫｕｎｍｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ，...

关键词： laser rapid solidification eutectic carbide defects

Microwave Effect On Partial Oxidation of Methane to Syngasover Ni/ZrO_2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第8期9卷 775-777页

作者： Xian Jun BI Xiao Guang XIE Ai Hong DUAN Pin Jie HONG Shu Shan DAI(Department of Chemistry, yunnan Normal university, kunming 650092)(Department of Chemistry, yunnan university, kunming 650091) yunnan Normal Univ Dept Chem Kunming 650092 Peoples R China yunnan Univ Dept Chem Kunming 650091 Peoples R China

The partial oxidation of methane to syngas over Ni/ZrO2 catalyst irradiated by ndcrowave has been studied. Compared with a conventional heating mode, the temperature of the catalytic bed is much lower and there is a h... 详细信息

关键词： microwave partial Oxidation methane syngas Ni/ZrO_2

Suspended sediment flux of river:Wavelet analysis in the Panlong basin of the Upper Red River (Honghe River),China

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第A02期52卷 172-179页

作者： DING WenRong~(1,2+) ZHOU Yue~(1,3) L XiXi~4 1 The Faculty of Environment Science and Engineering,kunming university of Science and Technology,kunming 650093,China 2 College of Tourism and Geography Science,yunnan Normal university,kunming 650092,China 3 yunnan university of Finance and Economics,kunming 650221,China 4 Department of Geography,National university of Singapore 119260,Singapore Univ Sci and Technol Kumasi Fac Environm Sci and Engn Kunming 650093 Peoples R China.

这份报纸把小浪分析用于检验变化趋势，多时间规模变化，在上面的红河的 Panlong 盆的推迟的沉积流动(SSF ) 的周期、突然的变化特征，中国。结果显示 SSF 从 1951 ～ 1997 增加了，但是自从 1998，衰退了。SSF 的变化把多时间规模特征... 详细信息

这份报纸把小浪分析用于检验变化趋势，多时间规模变化，在上面的红河的 Panlong 盆的推迟的沉积流动(SSF ) 的周期、突然的变化特征，中国。结果显示 SSF 从 1951 ～ 1997 增加了，但是自从 1998，衰退了。SSF 的变化把多时间规模特征和变化在不同时间时期改变了。三周期的时间规模， 4， 7 和 22 年，被决定。22 年的周期的时间规模，是在三次规模之中的最明显的，通过整个研究时期延长了，而第 4-a 7 年的时间规模在某些时间时期仅仅是明显的。分别地有 27 次越过 4 年的时间规模，越过 7 年的时间规模的 16 次和越过 22 年的时间规模的 5 次的突然的变化。根据统计的聚会和气候数据分析，我们断定人的活动是导致了多时间规模的 SSF，而是特征的变化趋势的主要原因，周期、突然的变化被气候变化主要影响。

关键词：河流中国红河微波分析

The Chemical Classification of the AGB Star IRAS 17515-2407

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2003年第6期3卷 551-554页

作者： Pei-Sheng Chen and Pin Zhang1National Astronomical Observatories, yunnan Observatory, Chinese Academy of Sciences, kunming 650011 2Cosmic Ray Institute, yunnan university, kunming 650091 Cosmic Ray Institute Yunnan University Kunming 650091

The chemical classification of IRAS 17515-2407 has been debated for a longtime. Up to now there are two contenders, oxygen-rich or carbon-rich. We believe that IRAS17515-2407 is an oxygen-rich source: because (ⅰ) it shows the silicate self-absorbed emission; (ⅱ)in the near infrared-IRAS diagram it is located in the oxygen-rich object region and (ⅲ)particularly, it has detected SiO maser emission.

关键词： stars: AGB stars: chemical classification stars: maser infrared: stars