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

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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 6502.1, 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

XRD STUDY OF RECOVERY PROCESS OF COLD DEFORMED Ag AND Ag-Ce ALLOY

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 27-31页

作者： NING Yuantao WENFei(kunming institute of precious metals kunming 6502.1.china. kunming Inst of precious metals Kunming China

The recovery processes of cold deformed Ag and Ag-Ce alloy containing trace cerium were studied by XRD *** on Scherrer formula and an analytical program,the lattice distortion and subgrain size for both Ag and Ag-Ce alloy were determined in the recovery *** cold deformed high purity Ag showed tow recrystallization temperature,obvious lattice relaxation and *** trace Ce solute is an effective inhibitor for recovery softening of high purity Ag since it raises the recrystallization temperature and restrains the lattice relaxation.

关键词： Ag Ag-Ce alloy recovery microalloying

Effects of copper-aspirin complex on platelet-neutrophil interactions

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Acta Pharmacologica Sinica 2004年第5期25卷 34-38页

作者： Zhi-qiang SHEN2, Peng CHEN3, Ling LI, Peng CHEN, Wei-ping LIU4Yunnan Pharmacological Laboratories of Natural Products, kunming Medical College, kunming 650031, china.3kunming Shenghuo Pharmaceutical Ltd Co, kunming 650217 4kunming institute of precious metals, kunming 6502.1, china. Yunnan Pharmacological Laboratories of Natural Products Kunming Medical College kunming Shenghuo Pharmaceutical Ltd Co kunming institute of precious metals

AIM: To investigate the effects of copper-aspirin complex on rat thrombosis and the interaction between plateletsand neutrophils. METHODS: The model of electrically stimulated carotid artery thrombosis in Sprague Dawleyrats was used; the effects of copper-aspirin complex on rat platelet-neutrophil adhesion and platelet aggregationstimulated by activated neutrophils were observed by rosette assay and Borns method, respectively. RESULTS:Intragastric copper-aspirin complex (5, 7, and 10 mg/kg) dose-dependently prolonged the occlusion time; it signifi-cantly decreased the rosette number formed between thrombin-activated platelets and neutrophils; the 50 % ofinhibitory concentration (IC50) was (54.64.3) mol/L. Copper-aspirin complex markedly inhibited rat plateletaggregation induced by either cell free supernatant of activated neutrophils or by activated neutrophil *** values of IC50 were (224.516.2) mol/L and (820.521.4) mol/L, whereas aspirin had no ***: Copper-aspirin complex inhibited platelet-neutrophil interactions through a different property fromaspirin and resulted in a more potent antithrombotic activity.

关键词： copper aspirin thrombosis platelets neutrophils adhesion platelet aggregation

METASTABLE PHASES IN RAPIDLY-SOLIDIFIED ALUMINIUMRICH Al-Sm ALLOYS

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Acta Metallurgica Sinica(English Letters) 1998年第4期11卷 301-306页

作者： Y.T.Ning (institute of precious metals, kunming 6502.1, china. Inst of precious metals Kunming China

The splat foils of Al-Sm alloys with 0.04-0.06mm in thickness were made by hammeranvil technique. The estimated cooling rute was 106K/ order of magnitude. The extended solid solubility of Sm in α-Al reached 0.5at. % Sm. The intermediate phase in the rapidlysolidified Al-Sm alloys is Al11Sm3 phase, which is stable only at temperatures above 1339K in equilibrium state and retained to ambient temperature as a metastable phase, whereas the equlibrium intermediate phase, Al3Sm, was restricted to occur.

关键词： Al-Sm alloy rapid solidification metastable phase

FACTORS INFLUENCING SOLID SOLUBILITIES OFRARE-EARTHS IN Pd

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 318-322页

作者： YN Ning and YT. Ning(kunming institute of precious metals, kunming 6502.1, china. kunming Inst of precious metals Kunming China

A parameter describing the solid solubilities of mre-earths in Pd, Nf/aX(TR - rPd),was proposed, where N is the fshell filled electron nutnben △X the electronegativity dtherence between Palladium and rare-earths, rR the atotnic radii of rare-earth elementand rPd of Pd. The marimum solid solubilities are linear relation to this parnmeterexcept La, Nd and Ce.

关键词： solid solubility rare-earth palladiutn

MICROSTRUCTURE AND EXTENDED SOLID SOLUBILITY OF Tb IN RAPIDLY SOLIDIFIED Ag-Tb ALLOY

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Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 143-146页

作者： NING Yuantao ZHO U Xinming LI Yongnian kunming institute of precious metals,kunming,china Kumming Inst of precious metals Kumming China

The 0,05—0.08 mm thick splat foils of Ag-Tb alloy,containing Tb up to 10 at.-%,were made by the hammer-anvil *** cooling rate was in order of 10~6 K/*** metastable extension of solid solubility of Tb in the alloy was measured to be up to 5 at.-% by lattice parameter *** secondary phase in metastable eutectic structure was identi- fied as Ag_3Tb from diffraction *** microstructure and micro-defect in as-quenched Ag-Tb splat foil were also observed.

关键词： rapid solidification Ag-Tb alloy solid solubility

METASTABLE EXTENSION OF SOLID SOLUBILITY OF RARE-EARTH ELEMENTS IN Al

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 327-333页

作者： NING Yuantao ZHOU Xinming DAI Hong institute of precious metals,kunming,Yunnan,china Inst of precious metals Kunming China

The splat folis of Al-RE(RE=Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Er and Yb) binary alloys of 0.04—0.06 mm thickness were made by are-melting and hammer-anvil technique,*** rate is in 10~6 K/s order of *** metastable extended solid solubilities of these RE elements have been evaluated by measurements of the lattice spacings of the rapidly solidified(RS)Al-RE alloys,they are 0.4,0.15,0.21,0.21,0.3, 0.5,0.1,0.6,0.65,0.7,0.75,0.2 at.-% for above individual RE clements,*** secondary phase in RS Al-RE alloys were identified to be Al_4RE for alloys containing light RE and Eu elements and Al_3 RE for alloys containing heavy RE and Y elements. Some factors influencing the extension of solid solubility of Al-RE alloy were discussed.

关键词： rapid solidification solid solubility Al-RE alloys

Influence of Rare-Earth Elements on ElectricalProperties of Pd

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Journal of Materials Science & Technology 1994年第6期10卷 459-462页

作者： Fei WEN Yuantao NING Huaizhi ZHAO and Deguo DENG(kunming institute of precious metals, kunming, 6502.1, china. kunming Inst of precious metals Kunming China

The influence of RE (RE = La, Ce. Pr. Nd, Sm, Eu, Gd. Tb. Dy, Er, Yb) additives with dilute concentrations on the electrical properties of Pd has been studied. All RE elements increase the specific resistivity (ρ) and decrease the resistance temperature coefficient (α) of Pd. and (ρ.α) Pd-RE ls equal to (ρ· α)*** RE elements before Gd reduce the thermo-emf of Pd on Cu. other heavy RE enhance the *** experimental data of normalized Pd-0.1 at.-%RE alloys indicate that the effect of light RE additives on the specific resistivity of Pd is larger than that of heavy RE and Ce. Eu and Yb show anomalous strong effect. The valence and atomic size are main factors influencing the electrical properties.

关键词： Influence of Rare-Earth Elements on ElectricalProperties of Pd Eu

Age Hardening of Rapidly-Solidified Mo-Th-B Alloys

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Rare metals 1989年第1期9卷 19-22页

作者： Ning, Yuantao Inst of precious metals China

Splat foils with 30-35 μm thickness and spum ribbon with 50-55 μm thickness of Mo-4Th-0.4B and Mo-8Th-0.8B were made by arc melt hammer-anvil and melt spinning techniques. Both alloys have high hardness and a strong age hardening response, especially Mo-8Th-0.8B. The precipitates associated with age hardening were ThB4(tetragon) and Mo2B (C16, BTC). The times for reaching a age hardening peak for both alloys are not the same and depended on the precipitation extent of Th and B solutes from the metastable solid solution. Grain refinement was observed. The work indicates that new high strength Mo alloys can be developed by rapid solidification.

关键词： Molybdenum Metallography Microstructures X ray Analysis