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Tensile behavior of Sn-0.7Cu with Zn addition at various deformation temperatures

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 155-160页

作者： Zhongbing L uo Jie ZHAo Junshan ZHANG Lai WANG School of Materials Science and Engineering Dalian University of Technology Dalian 116085 China

The tensile behavior of Sn-0.7Cu and Sn-0.7Cu-1Zn was compared at various deformation temperatures. Refined microstructure and γ-CuZn particles were discovered with Zn addition. The strengths of Zn-containing solder were higher than that of Sn-0.7Cu at room and subzero temperatures. With the elevation of deformation temperature, they both decreased and they were nearly the same at 80 ？ C. The works of fracture exhibited the similar evolution law. For Sn-0.7Cu solder, the elongation after fracture was smaller and the reduction of area was bigger than those of Sn-0.7Cu-1Zn. This shows that Zn addition improved the deformation stability, which is attributed to the modification of the microstructure. Dimples in fracture surface became smaller and shallower with the decreasing temperature. Ductile fracture was discovered in all the samples.

关键词： Sn-0.7Cu Zn Tensile Temperature Strength Ductility Fracture

Anti-inflammatory effects of Morninga oleifera lam extract in rats

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Asian Pacific Journal of Tropical Medicine 2010年第2期3卷 133-135页

作者： Georgewill oA Georgewill uo Nwankwoala RNP Department of Pharmacology College of Health SciencesUniversity of Port Harcourt

objective:To investigate the acute and delayed anti-inflammatory effects of Morning oleifera lam（MoL） crude methanolic ***:Compared the anti-inflammatory effects of MoL with that of standard anti-inflammatory agents like indomethacin and hydrocortisone using Air Pouch ***:In both acute and delayed inflammation,the MoL extract produced dose dependent anti-inflammatory effect[acute IC50=（399.30±5.43） mg/kg;delayed IC50=（510.26±4.53） mg/kg].The order of anti-inflammatory potency for the three drugs was hydrocortisone> indomethacin > ***:These observations indicate that MoL possesses potential anti-inflammatory property.

关键词： Extract Moringa oleifera lam Anti-nflammatory,indomethacin Hydrocortisone

Effect of extract of Abrus precatorius on blood glucose concentration of alloxan induced diabetic Albino Wistar Rats

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Asian Pacific Journal of Tropical Medicine 2009年第6期2卷 16-17页

作者： Georgewill oA Georgewill uo Department of Pharmacology and Toxicology

objective:To evaluate the effect of extract of Abrus precatorius on blood glucose of alloxan induced albino wistar ***:Experimental animals received daily oral administration of extract of Abrus precatorius for 14 *** effect of 200 mg/kg dose was studied during the treatment ***:There was a significant reduction in blood glucose concentration(P ood glucose of the different groups as 5.0±0.3 for normal control,7.0±0.4 for diabetic control group and 4.0±0.2 for diabetic treated group. Conclusion:The findings of this study suggest that extract of Abrus precatorius has hypoglycemic effect.

关键词： Abrus precatorius Hypoglycemia Diabetes Hyperglycemia

Antiarthritic activity of Vernonia amygdalina in albino rats

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Asian Pacific Journal of Tropical Medicine 2009年第5期2卷 58-60页

作者： Georgewill oA Georgewill uo Department of Pharmacology and Toxicology Faculty of Basic Medical SciencesCollege of Health SciencesUniversity of Port HarcourtChobaNigeria

objective:To evaluate the antiarthritic activity of water extract of leaves of Vernonia amygdalina(V.A.) on arthritis induced model of ***:Arthritis was induced in male albino Wister rats by injection of croton oil(0.1 mL) into the left foot pad of the *** with *** 200 and 400 mg/kg and standard Indomethacin(0.3 mg/kg) was started on the same day and continued up to the 12th *** paw volume was measured on the 1st,5th,12th and 21st day,respectively for both the paws and anti-arthritic activity was ***:The extract of *** reduction in the inflammation of the paw due to croton *** antiarthritic action started on the 5th day and continued till the 12th day and the activity was comparable to that of the standard on both *** inhibited adjuvant induced arthritis and had significant ant-inflammatory effect(Ponclusion:This report therefore clearly showed that *** inhibited adjuvant induced arthritis in rats as it significantly reduced the paw volume on the 12th day and may explain the effectiveness of this plant when used in the tropics for the treatment of arthritis.

关键词： Vernonia amygdalina Antiarthritic effect Croton oil

Regenerating deuterium absorption of Ti_(36)Zr_(40)Ni_(20)Pd_4 icosahedral quasicrystal

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Acta Metallurgica Sinica(English Letters) 2010年第6期23卷 446-450页

作者： Huogen HUANG Rong LI Tianwei LIU Liang CHEN Deli L uo Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621907 China China Academy of Engineering Physics Mianyang 621900 China

Ti/Zr-based icosahedral quasicrystals are a kind of promising hydrogen storage ma- terials, however their absorption regeneration after oxidation-poisoning has been scarcely studied. This work is intended to investigate the deuterium-storage re- generation of a suction-cast Ti36Zr40Ni20Pd4 quasicrystal. It was found that only through hot vacuuming the quasicrystal could be refreshed from air-flow poisoning to absorb deuterium in two cycles. During the first absorption course, a pregnancy period was observed before the real deuterium uptake while deuterium was loaded rapidly during the second one. The deuterium concentration in the alloy can reach 0.011 mol.D2/（g.M）（corresponding to a hydrogen mass percent of 2.2%. D2 and M denote molecular deuterium and the metallic alloy）. But the loaded deuterium was very difficult to release completely even by eight-stage desorption at different tem- peratures. After the second desorption, the quasicrystal phase remained in a small volume, as though the desorption temperature was beyond the crystallization temperature of the quasicrystal. This probably is attributed to the solution function of residual deuterium in the alloy.

关键词： Regenerate deuterium absorption Ti36Zr40Ni20Pd4 Icosahedral quasicrystal

Carbon Nanotube Coating on Titanium Substrate Modified with Tio_2 Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 867-871页

作者：白玉 PARK Ilsong BAE Taesung KIM Kyounga WATARI Fumio uo Motohiro LEE Minho Department of Dental Biomaterials School of Dentistry and Institute of Oral BioscienceBrain Korea 21 ProjectChonbuk National University School of Materials Science and Engineering Inner Mongolia University of Technology Department of Conservative Dentistry Institute of Oral Bioscience and BK 21 ProjectSchool of DentistryChonbuk National University Biomedical Dental Materials and EngineeringDepartment of Oral Health ScienceGraduate School of Dental MedicineHokkaido University Advanced Biomaterials Section Graduate School of Medical and Dental SciencesTokyo Medical and Dental University

A combination of carbon nanotubes （CNTs） and titanium （Ti） modified with Tio2 nanotubes （Tio2 NTs） was fulfilled with the aim of improving bioactivity of Ti ***,well-ordered Tio2 NTs were prepared by the electrochemical anodization of Ti in an ethylene glycol electrolyte containing 1 wt% NH4F and 10 wt% H2o at 20 V for 50 min,followed by ***,the carboxylated CNTs were coated onto the Tio2 NTs using electrophoretic deposition （EPD） *** growth of hydroxyapatite （HA） on the samples was investigated by soaking them in simulated body fluid （SBF）.The result showed the CNTs-coated Ti with the modification of Tio2 NTs （CNTs-Tio2 NTs） was more efficient to induce HA formation than the CNTs-coated smooth Ti （CNTs-Ti）.The vitro cell response was evaluated using osteoblast cells （MC3T3-E1）.The good cell proliferation and strong cell adhesion could be obtained on the CNTs-Tio2 *** results indicated that CNT coating on the Ti modified with Tio2 NTs could be potentially useful for the periodontal ligament combination on dental implants.

关键词： carbon nanotubes Tio2 nanotubes apatite-forming ability cell adhesion

Improvement of a Real Gas-Sensor for the origin of Methane Selectivity Degradation by l-XAFS Investigation

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Nano-Micro Letters 2015年第3期7卷 255-260页

作者： Takahiro Wada Naoyoshi Murata Takuya Suzuki Hiromitsu Uehara Hiroaki Nitani Yasuhiro Niwa Motohiro uo Kiyotaka Asakura Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Corporate R&D Headquarters Fuji Electric Co. Ltd Catalysis Research Center Hokkaido University Photon Factory Institute of Materials Structure Science

We have directly investigated the chemical state of the Pd species in a real l-gas sensor device by examining the l-fluorescence X-ray absorption fine structure. The l-gas sensor device was heavily damaged by a heating process in which the temperature was ill-controlled, resulting in decrease of methane selectivity. We found that the Pd o in the fresh l-gas sensor was reduced to Pd metal particles as the methane selectivity decreased. Based on the investigation results, we modified the device structure so as to heat up homogeneously. The lifetime of the sensor was then successfully increased by more than 5 years.

关键词： Micro gas sensor Micro-XAFS Pd/Al2o3 Deactivation

Spectra of Hydrogenic Donor States in Quantum-Dot Quantum Well Structures

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Chinese Physics Letters 1999年第9期16卷 680-682页

作者： uo Ying XIE Hong-jing MA Ben-kun LI Jia-qiang ZHU Jia-lin Department of Physics Beijing Normal UniversityBeijing 100875 Department of Physics Tsinghua UniversityBeijing 100084 Center of Theoretical Physics Chinese Center of Advanced Science and Technology(World Laboratory)P.O.Box 8730Beijing 100080

The series expansion approach has been employed to calculate the exact energy spectra of hydrogenic donor states in a quantum-dot quantum well(QDQW). The result shows that the hydrogenic donor energy levels are very different from those in a quantum dot. In a QDQW, the donor energy levels depend on not only the radius of core and the barrier, but also the numbers of small wells. When there exist two small wells outside the core, the “band gap”exists between donor levels, and its width depends on the depth of the small wells.

关键词： donor quantum hydrogenic

on Abundant Semigroups with Quasi-ideal Adequate Transversals

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Chinese Quarterly Journal of Mathematics 2010年第2期25卷 257-266页

作者： L uo Min-xia Department of Information and Mathematics Sciences China Jiliang University Hangzhou 310018 China

In this paper, we discuss some properties about an abundant semigroup with a quasi-ideal adequate transversal. Moreover, we show that the product of two quasi-ideal adequate transversals of an abundant semigroup which... 详细信息

关键词： abundant semigroup inverse transversal quasi-ideal adequate transversal adequate semigroup