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| 1 | 离子注入缺陷局域掺杂的高效率硅pn结发光二极管显示文摘本文将硼离子注入n型硅片制备出硅pn结发光二极管,系统研究了硼离子的注入剂量、能量、以及温度等条件对硅pn结电致发光效率的影响。随着注入的B原子浓度的提高,硅pn结二极管的电致发光效率显著增强,在B原子浓度接近2倍于退火温度下的固溶度时,室温下的电致发光效率达到最大值0.12%,比传统的硅pn结发光二极管增强了2-3个数量级。在低温电致发光光谱中,发现了两个来自局部掺杂缺陷的束缚激子发光峰。随着温度的升高,束缚激子的发光峰出现温度猝灭,束缚激子离化为自由电子和空穴,增加了硅带间自由激子复合的发光效率,从而使电致发光呈现随温度增加而增强的反常温度效应。 | 杨阳 孙甲明 张俊杰 张新霞 刘海旭 W. Skorupa M. Helm | 2009 | 材料科学与工程学报2009，27，1： | 2 |
| 2 | Expression of survivin, an inhibitor of apoptosis protein, in tumors of the nervous system显示文摘 | Tsutomu Sasaki Beatriz M. Lopes Gerald R. Hankins Gregory A. Helm | 2002 | Acta Neuropathologica2002，，1： | 1 |
| 3 | Meeting Report: Consensus Recommendations for a Research Agenda in Exercise in Solid Organ Transplantation显示文摘 | S. Mathur T. Janaudis‐Ferreira L. Wickerson L. G. Singer J. Patcai D. Rozenberg T. Blydt‐Hansen E. L. Hartmann M. Haykowsky D. Helm K. High N. Howes B. M. Kamath L. Lands S. Marzolini C. Sonnenday | 2014 | American Journal of Transplantation2014，，10： | 1 |
| 4 | Polychlorinated naphthalenes in polar environments — A review显示文摘 | Terry F. Bidleman Paul A. Helm Birgit M. Braune Geir Wing Gabrielsen | 2009 | Science of the Total Environment2009，，15： | 1 |
| 5 | Corporate universities vs higher education institutions显示文摘 | Judy C. Nixon Marilyn M. Helms | 2002 | Industrial and Commercial Training2002，，4： | 1 |
| 6 | Brand Name Translation Model:A Case Analysis of US Brands in China显示文摘 | Lily C. Dong Marilyn M. Helms | | 0，，02： | 1 |
| 7 | SEDIMENT YIELD-SURFACE TOPOGRAPHY RELATIONSHIPS FOR SELECTED MISSISSIPPI SOILS显示文摘Microtopography is an important surface characteristic of upland areas that affect erosion processes of detachment, transport, and runoff Yet, little quantitative information is available about the relationship between surface microtopography and sediment yield. A laboraory rainfall simulation study was conducted to determine for four different erosion susceptible soils the changes in surface microtopography and sediment yield during a series of 6 to 8 rainstorms of 0.75 h duration and 60 mm h-1 intensity each. The soils chosen were the Ap-materials of a Grenada sil (Glossic Fragiudalfs), Atwood sil (Typic Paleudalfs), and a Forestdale sicl (Typic Ochraqualfs), as well as the C-material, a Glauconitic sediment, of a Ruston sil (Typic Paleudalfs). Soil beds were prepared in a flume with a seedbed-like surface condition. Before all and after each rainstorm, the surface microtopography was determined using a laser microreliefmeter. Microtopography, expressed in terms of the mean local topographic gradient, and runoff data indicate a very similar pattern among the four soils. The data show an initially rapid increase in the sediment concenttation, which reached quickly a maximum and then gradually decreased to a near constant value at the end of the storm series. Sediment yield followed closely the sediment concentration trend due to a near constant runoff rate. Surface microtopography changed rapidly during the first rainstorm but then decreased more gradual to an approximate constant value for most of the later rainstorms in the sequence. Three distinct phases in the sediment yieldmicrotopography relationship are recognized: (1) a preponding phase, (2) a post ponding-increased sediment yield phase, and (3) a post ponding-decreased sediment yield phase. These phases reflect changes in the relative importance of soil erosion processes of roughness dissipation, rill development,and soil surface matrix stabilization. | M. J. M. ■(USDA-ARS National Sedimentation Laboratory, Oxford, MS 38655)K. Helming (ZALF, Muencheberg, Germany)S. N. Prasad(Dept. of Civil Engineering, University of Mississippi, University, MS 38677 | 2000 | International Journal of Sediment Research2000，15，1： | 1 |
| 8 | Expression of survivin, an inhibitor of apoptosis protein, in tumors of the nervous system显示文摘 | Tsutomu Sasaki Beatriz M. Lopes Gerald R. Hankins Gregory A. Helm | 2002 | Acta Neuropathologica2002，，1： | 1 |
| 9 | Polychlorinated naphthalenes in polar environments — A review显示文摘 | Terry F. Bidleman Paul A. Helm Birgit M. Braune Geir Wing Gabrielsen | 2009 | Science of the Total Environment2009，，15： | 1 |
| 10 | Patterns and regulation of mycorrhizal plant and fungal diversity显示文摘 | Edith B. Allen Michael F. Allen Dot J. Helm James M. Trappe Randy Molina Emmanuel Rincon | 1995 | Plant and Soil1995，，1： | 1 |
| 11 | Overexpression of a tryptophan decarboxylase cDNA inCatharanthus roseus crown gall calluses results in increased tryptamine levels but not in increased terpenoid indole alkaloid production显示文摘 | Oscar J. M. Goddijn Ed J. M. Pennings Peter Helm Rob A. Schilperoort Rob Verpoorte J. Harry C. Hoge | 1995 | Transgenic Research1995，，5： | 1 |
| 12 | A Novel Pyrrololactam Alkaloid from the South China Sea Sponge Phacellia Fusca Schmidt显示文摘Pyrrololactam type of alkaloids was found in many marine sponges which belong to the family Axinellidae. In the course of our systematic research for bioactive substances in marine organisms, we studied the sponge Phacellia fusca Schmidt which also belongs to the family Axinelldae. From the chloroform-soluble fraction, ten A-nor-sterols were isolated and identified, while from the water-soluble portion, three known pyrrololactam alkaloids and a new pyrrololactam alkaloid, which was named fuscin, were obtained. The present paper contains the isolation and structure determination of fuscin (1). | Florecita De Guzman Francis J. Schmitz M. Bilayet Hossain Dick van der Helm | 1991 | Chemical Research in Chinese Universities1991，7，3： | 1 |
| 13 | Delayed onset of Alzheimer’s disease with nonsteroidal anti-inflammatory and histamine H2 blocking drugs显示文摘 | John C.S. Breitner Kathleen A. Welsh Michael J. Helms Perry C. Gaskell Barbara A. Gau Allen D. Roses Margaret A. Pericak-Vance Ann M. Saunders | 1995 | Neurobiology of Aging1995，，4： | 1 |
| 14 | Risk prediction of very early recurrence, death and progression after acute ischaemic stroke显示文摘 | I. L. Maier M. Bauerle P. Kermer H.‐J. Helms T. Buettner | 2012 | Eur J Neurol2012，，4： | 1 |
| 15 | 围手术期输注红细胞可降低心脏手术术后远期存活率显示文摘背景输注红细胞(RBC)与心脏手术后死亡率升高有关。我们分析了在住院期间接受了1或2个单位RBC输注的心脏手术患者的长期生存情况。方法将2001年至2004年期间9079例,在新英格兰北部地区8个医疗中心中接受了冠状动脉旁路移植术、瓣膜手术或同时进行了冠状动脉旁路移植术和瓣膜手术的患者纳入本研究。研究将纳入地区与2006年6月30日社会保障署死亡档案确定的死亡率进行概率性配对。调整的风险比采用Cox比例风险和倾向评分法进行计算。结果36%的患者(n=3254)接受过1或2个单位的RBC。43%的RBCs是在手术中被输注的,分别有56%和1%的RBCs是在手术后和手术前输注的。输血的患者更可能是贫血、高龄、体表面积小、女性和同时患多种疾病的患者。那些在心脏手术住院期间接受了1或2个单位RBCs的患者的存活率显著低于未接受过RBCs的患者(P〈0.001)。调整了患者和疾病特征之后,接受1或2个单位RBCs仍使远期死亡风险提高16%(调整的风险比=1.16,95%CI:1.01—1.34,P=0.035)。结论输注1或2个单位的RBCs可使心脏手术术后存活率降低的风险提高16%。 | Stephen D. Surgenor, MD Robert S. Kramer, MD Elaine M. Olmstead, BA Cathy S. Ross, MS Frank W. Sellke, MD Donald S. Likosky, PhD Charles A. S. Martin, MBBS Robert E. Helm, Jr., mD Bruce J. Leavitt, MD Jeremy R. Morton, MD David C. Charlesworth, MD Robert A. Clough, MD Felix Hernandez, MD Carmine Frumiento, MD Arnold Benak, CCP Christian DioData, CCP Gerald T. O'Connor, PhD, DSc 周全红(译) 江伟(校) | 2010 | 麻醉与镇痛2010，，5： | 0 |
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