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Solid liquid Mixed Casting of Al-Si Alloy

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Journal of Central South university 2000年第3期12卷 133-135页

作者： Chen, zh Kang, ZT Cent S univ Technol Dept Mat Sci & Engn Changsha 410083 Peoples R China

The paper presents a novel material preparation technology—Solid liquid mixed casting technology. In the technology, large amounts of homogeneous alloy powder or heterogenous powder with perfect wettability are added into the superheated melt. After strong agitation, the mixed melt can be cast or hot processed. Applying solid liquid mixed casting, three kinds of Al Si alloys were investigated. The results show that, when the mass of powder accession to alloy melt is about 1, the mean size of primary Si in hyper eutectic alloy can be controlled at less than 5 μm; and the mean grain size of α phase in hypo eutectic alloy is less than 10 μm. This technology has the advantage of preparing material with very fine microstructure by fairly simple casting process, and may be a new practicable and valuable metal preparation technology.

关键词： solid liquid mixed casting powder melt Document code:A

A Simple and Novel Ipso-Bromination of 1-Bromomethyl-4-t-butyl-2,6-dimethylbenzene

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Chinese Chemical Letters 1997年第4期8卷 271-274页

作者： zhang, WC Yu, zh ChINESE ACAD SCI INST CHEMBEIJING 100080PEOPLES R CHINA

A novel ipso electrophlic substitution of 1-bromomethyl-4-t-butyl-2,6-dimethylbenzene 1 with nitric acid in alcohol, which gives ipso-bromination product of 1-bromo-4-t-butyl-2,6-dimethylbenzene 2, is described and a ... 详细信息

关键词： EIMS A Simple and Novel Ipso-Bromination of 1-Bromomethyl-4-t-butyl-2,6-dimethylbenzene

Serum deprivation enhances DNA synthesis of human hepatoma SMMC-7721 cells

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World Journal of Gastroenterology 1998年第2期4卷 29-32页

作者： Jiang, SM Xu, zh Shandong Normal univ Dept Biol Provincial Key Lab Anim Stress Jinan 250014 Shandong Provin Peoples R China

AIM To determine the relationship between serum deprivation or serum levels and cell proliferation of human hepatoma SMMC 7721 cells. METhODS human hepatoma SMMC 7721 cells were grown in RPMI 1640 supplemented with 10% fetal calf (FCS) in 5% CO 2 incubator at 37℃ for 24h , and culture media were replaced to serum free or different serum FCS levels (2 5%, 5%, 10%, 20% and 25%). Six h, 12h , 18h and 24h after the culture, the cells were incorporated TdR for 4h . At last TdR incorporation was detected with liquid scintillation counting. RESuLTS DNA synthesis of SMMC 7721 cells could be sharply stimulated by short time (6h) serum deprivation (the cpm value of 3h TdR incorporation of cells in serum free was 39 32 fold higher than cells in 25% serum), and the incorporation of 3h TdR was negatively related to the serum levels. Longer time serum starvation ( 12h , 18h and 24h ) also greatly stimulated DNA synthesis, although the cpm value of 3h TdR incroporation was less than that in 6h serum deprivation. Morphology of cells cultured in different serum levels also showed significant difference. CONCLuSIONS Compared with other cell lines such as BEL7404 and Swiss 3T3, human hepatoma SMMC 7721 cells had different response to the serum deprivation. Short time serum deprivation could greatly stimulate DNA synthesis of human hepatoma SMMC 7721 cells. Precautions must be given to the changes of serum levels for the detection of growth factors and drugs using SMMC 7721 cells as a model.

关键词： liver neoplasms carcinoma, hepatocellular DNA, neoplasm/biosynthesis SMMC 7721 tumor cell, cultured cell proliferation growth factors

EFFECT　OF　RARE　EARTh　ELEMENT　Er　ON　STRENGThENING　OF　INTERFACE　OF　Ti（C，N）　BASED　CERMETS

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中国有色金属学会会刊：英文版 1996年第3期6卷 136-139页

作者： Liu, N Cui, K hu, zh ANhuI INST TEChNOL DEPT MAT SCI & ENGNHEFEI 230069PEOPLES R CHINA huAzhONG uNIV SCI & TEChNOL WUHAN 430074PEOPLES R CHINA

ＥＦＦＥＣＴＯＦＲＡＲＥＥＡＲＴＨＥＬＥＭＥＮＴＥｒＯＮＳＴＲＥＮＧＴＨＥＮＩＮＧＯＦＩＮＴＥＲＦＡＣＥＯＦＴｉ（Ｃ，Ｎ）ＢＡＳＥＤＣＥＲＭＥＴＳ￥ＬｉｕＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎ... 详细信息

ＥＦＦＥＣＴＯＦＲＡＲＥＥＡＲＴＨＥＬＥＭＥＮＴＥｒＯＮＳＴＲＥＮＧＴＨＥＮＩＮＧＯＦＩＮＴＥＲＦＡＣＥＯＦＴｉ（Ｃ，Ｎ）ＢＡＳＥＤＣＥＲＭＥＴＳ￥ＬｉｕＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： rare earth element Er Ti(C N) based cermets bending strength hardness

Nonlinear Analysis of Pile Foundation Jacket Platform

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China Ocean Engineering 1997年第1期12卷 21-28页

作者： Xu, B Shen, zh Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

In this paper, the nonlinear collapse of the BOhAI-8 pile foundation jacket platform has been analyzed. The ultimate load and collapse process of two computational models of the structure are given. One model is of fixed support whose length is eight times the pile leg diameter and the other considers the nonlinearity of the soil-pile interaction.

关键词： nonlinear analysis jacket platform ultimate load platform collapse

DEVELOPMENT　OF　DISTILLATE　hDS　CATALYST

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催化学报 1996年第5期17卷 401-403页

作者： zhang Kongyuan zh ResearchinstituteofQiluPetrochemicalCompany Zibo25 ResearchinstituteofQiluPetroc

ＤＥＶＥＬＯＰＭＥＮＴＯＦＤＩＳＴＩＬＬＡＴＥＨＤＳＣＡＴＡＬＹＳＴＺｈａｎｇＫｏｎｇｙｕａｎ，ＺｈｏｕＲａｎ，ＺｈｅｎｇＳｈａｏｋｕａｎ，ＭａｏＰｅｎｇｓｈｅｎｇ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＱｉｌｕＰｅ... 详细信息

ＤＥＶＥＬＯＰＭＥＮＴＯＦＤＩＳＴＩＬＬＡＴＥＨＤＳＣＡＴＡＬＹＳＴＺｈａｎｇＫｏｎｇｙｕａｎ，ＺｈｏｕＲａｎ，ＺｈｅｎｇＳｈａｏｋｕａｎ，ＭａｏＰｅｎｇｓｈｅｎｇ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＱｉｌｕＰｅｔｒｏｃｈｅｍｉｃａｌＣｏｍｐａｎ...

关键词：发展馏出液加氢脱硫过程催化剂氧化铝氧化钼氧化钴热解汽油改性剂

Fabrication of Silicon Quantum Wires by Conventional Silicon Processing

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high Technology Letters 1995年第1期1卷 25-27页

作者： Yi, Sh. Jianlin, L. Feng, W. Rong, zh. Ping, h. Shulin, G. Shunming, zh. Baohua, M. Youdou, zh. Nanjing univ Nanjing China

ultra fine silicon quantum wires with the Si/SiO2 heterointerface have been fabricated successfully by using reactive ion etching, anisotropic wet chemical etching and subsequent thermal oxidation. The cross-sectional image of scanning electron microscope shows the silicon quantum wires of high quality with the linewidth down to 20nm. The present method has many remarkable advantages, which is important to the study of low-dimension quantum physics and devices.

关键词： Quantum wire Silicon Silicon dioxide Silicon technique

Constructive proof on the existence of periodic solution of Duffing equation

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Chinese Science Bulletin 1997年第22期42卷 1870-1874页

作者： Li, WG Shen, zh Nanjing univ Dept Math Nanjing 210093 Peoples R China

CONSIDER the following boundary value problem of Duffing equation:{x(t)+Cx’(t)+g(t,x)=e(t), x(0)-x’(zπ)=x’(0)-x’(2π)=0,} (1)where g: R×R→R is continuous and continuously differentiable with respect to x, continu-ous and 2π-periodic with respect to t. C is a constant. e: R→R is continuous and 2π-period-ic. If there exist two almost everywhere continuous functions a(t), b(t)

关键词： Duffing equation periodic solution continuation.

SYNThESIS OF A 2-ARYLBENZOFuRANOID DERIVATIVE

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Chinese Chemical Letters 1995年第4期6卷 289-292页

作者： Yan, zh Li, LN Beijing union Med Coll Chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China

A derivative of 2-arylbenzofuranoid pattern fashioned after the naturally occurring isolates from Salviamiltiorrhiza was synthesized by Perkin condensation and oxidative ring closure.

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