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World Journal of Gastroenterology 2007年第1期13卷 1-7页

作者： Gary e Wild Laurie Drozdowski Carmela Tartaglia M Tom Clandinin Alan BR Thomson Department of Medicine Division of Gastroen- terology McGill University Montreal Quebec Department of Anatomy and Cell Biology McGill University Montreal Quebec Canada Division of Gastro- enterology University of Alberta Edmonton Alberta Canada Department of Physiology McGill Univer- sity Montreal Quebec Canada Department of Agriculture Foods and Nutri- tion University of Alberta Edmonton Alberta Canada

Nutrient deficiencies a.e.common in patients with inflammatory bowel disea.e.（IBD）. Both total pa.e.teral and enteral nutrition provide important supportive therapy for IBD patients, but in adults these a.e.not useful for primary therapy. Dietary intervention with omega-3 polyunsatura.e. fatty acids contained in fish oil may be useful for the ca.e.of IBD patients, and recent studies ha.e.slyessed the role of PPAR on NFKB activity on the potential beneficial effect of dietary lipids on intestinal function.

关键词： Crohn's disease Ulcerative colitis enteral nutrition Pa.e.teral nutrition Glutamine Fiber Long chain fatty acids

ANALYSIS MODeL TO SIMULa.e.THe CRACKeD PIPe BURIeD IN SOIL

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Acta Mechanica Sinica 1998年第2期14卷 147-156页

作者：庄茁 P.e.O’Donoghue Department of engineering Mechanics Tsinghua University Beijing China 100084 Department of Civil engineering University College Dublin Earlsfort Terrace Dublin 2 Ireland

The finite element method was used to simula.e.the crack propagation in a pipeline in the presence of soil backfill. Since typical values for soil modulus a.e.known, a spring element can be used to simula.e.the effects of backfilled soil on crack propagation. This consists of the relationship between the soil property and the stiffness of the spring element, and the effect of backfill depth on the crack propagation in the pipes. By equating crack driving force, G, in the presence of soil, to the dynamic fracture toughness of the pipeline ma.e.ial, a theoretical predictive capability was obtained for the gas transmission and distribution pipelines. Numerical calculations had also been carried out for the cracked pipe with backfill and without backfill. (edited author abstract) 9 Refs.

关键词： fracture mechanics finite element simulation pipeline soil

Transplantation of hypoxia preconditioned bone marrow mesenchymal stem cells improves survival of ultra-long random skin flap

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Chinese Medical Journal 2011年第16期124卷 2507-2511页

作者： WANG Ji-chang XIA Lin SONG Xiao-bin WANG Chun-e WeI Feng-cai Department of Plastic Surgery the Second Hospital of ShandongUniversity Jinan Shandong 250033 China Department of Plastic Surgery Qilu Hospital of Shandong University Jinan Shandong 250012 China Department of Oral and Maxillofacial Surgery Qilu Hospital of Shandong University Jinan Shandong 250012 China Institute of Dental Medicine Shandong University JinanShandong 250012 China

Background Random flap is one kind of the most widely used skin flaps in reconstructive surgery; however, partial necrosis of its distal end remains a significant problem now. The aim of this study was to evalua.e.the effect of hypoxia preconditioned bone marrow mesenchymal stem cells （HpBMSCs） transplantation on ultra-long random skin flap survival in rats. Methods Normoxic bone marrow mesenchymal stem cells （nBMSCs） were cultured under normoxia （20% 02） and HpBMSCs under hypoxia （1% 02） for 48 hours before transplantation. Thirty Sprague-Dawley rats were randomly divided into control group, nBMSCs group and HpBMSCs group with each consisting of 10 rats. Survival a.e. of ultra-long random skin flap on the dorsal of rats was measured seven days after flap surgery and cell transplantation. Cell survival in vivo, microvessel density and vascular endothelial growth factor （VeGF） were evalua.e. by histological examination and enzyme-linked immunosorbent assay. Results Compa.e. with other two groups, flap survival a.e. in HpBMSCs group was significantly larger （P 〈0.05）. Microvessel density in HpBMSCs group （36.20-.8.19） was higher than that in nBMSCs group （30.01-.5.68） and control group （17.60..4.19）（P 〈0.05）. VeGF in HpBMSCs group （（300.05-.50.41） pg/g） was higher than those in nBMSCs group （（240.55_＋33.64） pg/g） and control group （（191.65..32.58） pg/g）（P 〈0.05）. Conclusion HpBMSCs transplantation improves ultra-long random skin flap survival via promoting angiogenesis of more survival cells.

关键词： random skin flap cell transplantation mesenchymal stem cells hypoxic preconditioning angiogenesis

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风险管理与保险原理

Biofiltration of the antibacterial drug sulfa.e.hazine by the species Chenopodium quinoa and its further biodegradation through anaerobic digestion

作者： G. e.·瑞达

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Journal of environmental Sciences 2019年第1期31卷 54-63页

作者： Ariel e.Turcios Jutta Pa.e.brock Institute of Botany Leibniz University Hannover

The biofiltering capacity, distribution patterns and degradation of the antimicrobial sulfa.e.hazine(SMT) by halophyte Chenopodium quinoa under hydroponic conditions and its further biodegradation through anaerobic digestion were evalua.e.. C. quinoa was cultiva.e. for a complete life cycle under different concentrations of SMT(0, 2 and 5 mg/L) and sodium chloride(0 and 15 g/L). C. quinoa is able to upta.e.and partially degra.e.SMT. The higher the SMT concentration in the culture medium, the higher the SMT content in the plant tissue. SMT has different distribution patterns within the plant organs, and no SMT is found in the *** crop residues containing SMT ha.e.a great potential to produce metha.e.through anaerobic digestion and, in addition, SMT is further biodegra.e.. The highest specific metha.e.yields a.e.obtained using crop residues of the plants cultiva.e. in the presence of salt and SMT with concentrations between 0 and 2 mg/L.

关键词： Anaerobic digestion Chenopodium quinoa FISH analysis Phytoremediation Sulfa.e.hazine biodegradation

Grob''s basic electronics

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Grob''s basic electronics

Mechanical, electrical, and thermal properties of the directionally solidified Bi–Zn–Al ternary eutectic alloy

1000年

作者： Schultz Mitchel e.

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International Journal of Minerals,Metallurgy and Ma.e.ials 2014年第10期21卷 999-1008页

作者： M.Sahin e.adrli Department of electronics and Automation Technical Vocational School of Sciences Nigde University Department of Physics Faculty of Arts and Sciences Nigde University

A Bi-2.0Zn-0.2A1 （wt%） ternary eutectic alloy was prepa.e. using a vacuum melting furna.e.and a casting furna.e. The samples were directionally solidified upwards at a constant growth ra.e.（V= 18.4 μm/s） under different temperature gradients （G = 1.15-3.44 K/mm） and at a constant temperature gradient （G = 2.66 K/mm） under different growth ra.e. （V= 8.3-500 μm/s） in a Bridgman-type directional so- lidification furna.e. The dependence ofmicrostructure para.e.er （2） on the solidification para.e.ers （G and V） and that of the microhardness （Hv） on the microstructure and solidification para.e.ers were investiga.e.. The resistivity （ρ） measurements of the studied alloy were per- formed using the standard four-point-probe method, and the temperature coefficient of resistivity （α） was calcula.e. from the ρ-Tcurve. The enthalpy （AH） and the specific heat （Cp） values were determined by differential scanning calorimetry analysis. In addition, the thermal conductivities of samples, obtained using the Wiedemann-Franz and Smith-Palmer equations, were compa.e. with the experimental results. The results revea.e. that, the thermal conductivity values obtained using the Wiedemarm-Franz and Smith-Palmer equations for the Bi-2.0Zn-0.2Al （wt%） alloy a.e.in the range of 5.2-6.5 W/Km and 15.2-16.4 W/Km, respectively.

关键词： ternary eutectic alloys directional solidification microhardness electrical resistivity thermal conductivity

Modern elementary statistics

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Modern elementary statistics

Theoretical Analysis on effect of Adding Argon to Hydrogen Plasma

2007年

作者： Freund John e.

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Plasma Science and Technology 2004年第2期6卷 2204-2212页

作者：胡纯栋 e.Speth Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China Max-Planck-Institut fiir Plasmaphysik EURATOM-Association 85748 Garching Germany

An increa.e. of H ion beam current whenever argon gas is added has been observed. The physics behind argon effect is that in the production of more H atoms, a part of H atoms will be converted to H2*(v>4) to increa.e.H- density. Increa.e.of nH depends on the ra.e.of added Ar η %, primary filling pressure P, electron density neAr and recombination coefficient 7 of H atom. Adding 25% Ar is optimal, although there ha.e.been assumed various para.e.ers. Increa.e.of nH depends on decrea.e. recombination coefficient 7, and increa.e. primary filling pressure P. The increa.e.of nH is small when the pressure P ed volume size L/R^2 is optimal for obtaining a maximum Ar effect.

关键词： H- ion beam Ar effect neutral beam injection

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基于空间视角的风险投资研究进展与展望

地理科学进展 2022年第3期41卷 477-487页

作者：杜德林王姣娥中国科学院地理科学与资源研究所区域可持续发展分析与模拟重点实验室北京100101 中国科学院大学资源与环境学院北京100049

风险投资有利于推动技术创新与高新技术产业发展,随着行业整体的发展以及在投资过程中表现出对信息、时间和成本等要素的较高要求,空间的约束作用逐渐受到重视,成为重要的研究视角。在此背景下,梳理总结国内外空间视角下的风险投资研究... 详细信息

风险投资有利于推动技术创新与高新技术产业发展,随着行业整体的发展以及在投资过程中表现出对信息、时间和成本等要素的较高要求,空间的约束作用逐渐受到重视,成为重要的研究视角。在此背景下,梳理总结国内外空间视角下的风险投资研究进展具有重要的启示意义,可以为相关学科研究提供借鉴与参考。论文首先明确风险投资概念并梳理相关影响因素,分析空间视角下的风险投资研究框架;在此基础上,针对风险投资机构、被投企业与投资活动,归纳风险投资的空间分布特征;再结合风险投资过程,就风险投资的本地偏好以及距离对投资策略和投资绩效方面的影响进行归纳总结;结合交通发展对空间约束作用的克服,总结现有研究对交通影响作用的探讨;最后基于已有研究进展与不足,探讨相关研究启示与展望。

关键词：风险投资空间视角距离交通地理学