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Studies on monodispersed colloidal particles of doped yttrium compounds

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Chinese Journal of Chemistry 1995年第3期13卷 199-206页

作者： DENG, hm XU, Y GU, YD FUDAN UNIV ANAL & MEASUREMENT RES CTRSHANGHAI 200433PEOPLES R CHINA FUDAN UNIV DEPT CHEMSHANGHAI 200433PEOPLES R CHINA

Monodispersed particles of doped yttrium basic carbonates were prepared at aging at elevated temperature corresponding salts solutions in the presence of urea. Coprecipitation in mixed solutions of yttrium, lanthanum and neodymium salts under similar experimental conditions yielded composite particles of basic carbonates. The content of the three metals in the solids followed closely the initial composition of the reacting solutions. On calcination all prepared solids converted to their corresponding oxides while retaining their particle morphology. The so-prepared powders were characterized by various techniques.

关键词： YTTRIUM COMPOUNDS MONODISPERSED PARTICLES UREA DECOMPOSITION

Localization of tPA and PAI-1 mRNA in rat testis

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Chinese Science Bulletin 1997年第7期42卷 588-592页

作者： Zhou, hm Liu, YX CHINESE ACAD SCI INST ZOOLSTATE KEY LAB REPROD BIOLBEIJING 100080PEOPLES R CHINA

THE physiological function of tPA and PAI-1 in rat and monkey ovulation has been previously documented. In order to elucidate the function of tPA and PAI-1 in spermatogenesis, we have studied expression of tPA and PAI... 详细信息

关键词： tPA PAI-1 spermatogenesis in situ hybridization.

Study on the Asymmetrical Cold Rolling of Strip under Large Width to Thickness Ratio

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Journal of Materials Science & Technology 1996年第3期12卷 232-234页

作者： Liu, hm Lian, JC Duan, ZY Yanshan University Qinhuangdao 066004 China

On the condition of the width to thickness ratio 625 of rolled strip, the asymmetrical cold strip rolling process about the width center is studied by using computer numerical simulation method and experimental method. The simulated results of the transverse distributions of the rolling pressure, the 2-directional frictions and the front and back tensions agree with the experimental results well. It is an important discovery that the rolling pressure has three peak values across the strip width on the condition of large width to thickness ratio.

关键词： Study on the Asymmetrical Cold Rolling of Strip under Large Width to Thickness Ratio

STERIC　EFFECT　OF　HYDROXY　GROUPS　ORTHO　TO　THE　AZO－GROUP　ON　ANALYTICAL　BEHAVIOR　OF　CHROMOGENIC　REAGENTS

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Chinese Chemical Letters 1996年第3期7卷 275-278页

作者： Ma, hm Huang, YX Liang, SQ CHINESE ACAD SCI INST CHEMBEIJING 100080PEOPLES R CHINA

Three new azo-reagents having different numbers of hydroxy groups ortho to the azo-group, i.e.,2-(2', 4', 6'-trihydroxyphenylazo) -, 2-(2', 4'-dihydroxyphenylazo)- and 2-(4'-hydroxyphenytaro)benzenearsonicacid. were synthesized. Through comparative studies on the reactions of the three reagents with vinous metalions, especially with iron(III), it was found that not only selectivities but also sensitivities of azo-reagents canbe improved by utiltting rationally the steric effect of groups ortho to the azo-group. The reasons for theimprovements were discussed.

关键词： ORGANIC ANALYTICAL REAGENTS FUTURE-STATUS

Expression and regulation of plasminogen activator and plasminogen activator inhibitor type-1 in rat epididymis

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Chinese Science Bulletin 1997年第9期42卷 779-783页

作者： Zhou, hm Zhang, T Liu, YX CHINESE ACAD SCI INST ZOOLSTATE KEY LAB REPROD BIOLBEIJING 100080PEOPLES R CHINA

EPIDIDYMIS is the site where spermatozoa released from testis undergo maturation and become capable of fertilizing *** epididymal secretions including enzymes,nutrients and hor-mones are believed to be essential for sperm *** proteolysis contributes toloss or modification of surface molecules of spermatozoa,which is an important aspect of

关键词： plasminogen activator plasminogen activator inhibitor human chorionic gonadotropin/luteinizing hormone epi-didymis.

Two New Sesquiterpenes from Ligularia Intermedia

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Chinese Chemical Letters 1996年第12期7卷 1100-1102页

作者： Chen, hm Cai, MS Jia, ZJ BEIJING MED UNIV SCH PHARMACEUT SCIBEIJING 100083PEOPLES R CHINA LANZHOU UNIV DEPT CHEMLANZHOU 730000PEOPLES R CHINA

Two new sesquiterpenes were isolated from the rhizomes of Ligularia intermedia. Their structures were determined as eremophil-7(8)-en-12,8(4 beta, 6 alpha)-diolide(1) and eremophil-7(8)-en-12,8(4 beta, 6 beta)-diolide... 详细信息

关键词： New Sesquiterpenes from Ligularia Intermedia Two

STUDIES ON DERIVATIVES OF CLERODANE DITERPENOIDSFROM AJUGA DECUMBENS

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Chinese Chemical Letters 1996年第6期7卷 549-552页

作者： Chen, hm Xie, N Min, ZD NANKAI UNIV INST ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA CHINA PHARMACEUT UNIV DEPT PHYTOCHEMNANJING 210009PEOPLES R CHINA

Some derivatives of neo-clerodane diterpenes ajugacumbin A and B isolated from Ajuga decumbens were prepared by various chemical transformations, and the results achieved in the biological assay as insect antifeedants...

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The application of Graphic information analysis in land use change

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The application of Graphic information analysis in land use ...

Tribological Properties of DLC Film Prepared by C^+ Ion Beam-assisted Deposition (IBAD)

International Conference on Info-Tech and Info-Net (ICII 2001)

作者： Liu, XN Xu, hm NE Normal Univ Sch Urban & Environm Sci Changchun 130024 Peoples R China

ISBN: (纸本)7900081585

Land use or land cover change is the focus of the global environmental changes. Land use is a number of heterogeneous spatial patterns under complex driving forces. Land use does not only show itself in terms of quantity change and quality modification, but also in terms of spatial pattern change. Furthermore, spatial pattern change is an important content in the study field of land use change. In this article we select Qianguo County of Jilin Province as a study area, detect land use changes based on the Landsat TM with the post-classification method, and calculate the transition matrix based on GIS. We then analyze spatial pattern change of land use in study area based on the combination of geography graphic information theory, statistic analyses and spatial analysis tools of GIS. The results indicate that we can use several graphic parameters to depict the patches of every land use type, and the curve of the graphic parameters changing with the area of the graph can in effect disclose the characteristics of different land use class. Furthermore, we can use VCM curves to express the land use spatial pattern and its change.

关键词： GIS graphic information theory remote sensing change detection

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Journal of Wuhan University of Technology(Materials Science) 2006年第1期21卷 49-52页

作者：白秀琴 Peter Bhm Reliability Engineering Institute Wuhan University of Technology Wuhan 430063ChinaWuhan Research Institute of Materials Protection Wuhan 430030 China IAVF Antriebstechnik AG 76187 KarlsruheGermany

C ^＋ ion beam-assisted deposition was utilized to prepare deposit diamond-like carbon （ DLC ） film. With the help of a series of experiments such as Raman spectroscopy, FT-IR spectroscopy, AFM and nanoindentation , the DLC film has been recognized as hydrogenated DLC film and its tribologicul properties have been evaluated. The bull-on-disc testing results show that the hardness and the tribologicul properties of the DLC film produced by C^ ＋ ion beam- assisted deposition are improved significantly. DLC film produced by C ^＋ ion beam- assisted deposition is positive to have a prosperous tribologicul application in the near future.

关键词： DLC film C ^+ ion beam- assisted deposition (IBAD) tribological properties