期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
PEALD-deposited crystalline GaN films on Si(100) substrates with sharp interfaces
1
作者 刘三姐 何荧峰 +6 位作者 卫会云 仇鹏 宋祎萌 安运来 阿布度-拉赫曼 彭铭曾 郑新和 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期376-382,共7页
Polycrystalline gallium nitride(GaN) thin films were deposited on Si(100) substrates via plasma-enhanced atomic layer deposition(PEALD) under optimal deposition parameters. In this work, we focus on the research of th... Polycrystalline gallium nitride(GaN) thin films were deposited on Si(100) substrates via plasma-enhanced atomic layer deposition(PEALD) under optimal deposition parameters. In this work, we focus on the research of the GaN/Si(100)interfacial properties. The x-ray reflectivity measurements show the clearly-resolved fringes for all the as-grown GaN films, which reveals a perfectly smooth interface between the GaN film and Si(100), and this feature of sharp interface is further confirmed by high resolution transmission electron microscopy(HRTEM). However, an amorphous interfacial layer(~ 2 nm) can be observed from the HRTEM images, and is determined to be mixture of Ga_xO_y and GaN by xray photoelectron spectroscopy. To investigate the effect of this interlayer on the GaN growth, an AlN buffer layer was employed for GaN deposition. No interlayer is observed between GaN and AlN, and GaN shows better crystallization and lower oxygen impurity during the initial growth stage than the GaN with an interlayer. 展开更多
关键词 GALLIUM NITRIDE PEALD SHARP interface x-ray REFLECTIVITY high resolution transmission electron microscopy
Segregation behavior of magnetic ions in continuous flowing solution under gradient magnetic field
2
作者 冀冰 吴平 +3 位作者 任菡 张师平 Abdul Rehman 王立 《中国物理B:英文版》 SCIE EI CAS CSCD 2016年第7期286-293,共8页
The research of magnetic separation starts from magnetic solid particles to nanoparticles, and in the research progress,particles become smaller gradually with the development of application of magnetic separation tec... The research of magnetic separation starts from magnetic solid particles to nanoparticles, and in the research progress,particles become smaller gradually with the development of application of magnetic separation technology. Nevertheless,little experimental study of magnetic separation of molecules and ions under continuous flowing conditions has been reported. In this work, we designed a magnetic device and a "layered" flow channel to study the magnetic separation at the ionic level in continuous flowing solution. A segregation model was built to discuss the segregation behavior as well as the factors that may affect the separation. The magnetic force was proved to be the driving force which plays an indispensable role leading to the segregation and separation. The flow velocity has an effect on the segregation behavior of magnetic ions,which determines the separation result. On the other hand, the optimum flow velocity which makes maximum separation is related to the initial concentration of solution. 展开更多
关键词 分离行为 流动溶液 离子水 磁性 梯度磁场 磁分离技术 纳米颗粒 最佳流速
Rice molecular markers and genetic mapping: Current status and prospects 预览
3
作者 Ghulam Shabir Kashif Aslam +8 位作者 Abdul Rehman Khan Muhammad Shahid Hamid Manzoor Sibgha Noreen Mueen Alam Khan Muhammad Baber Muhammad Sabar Shahid Masood Shah Muhammad Arif 《农业科学学报:英文版》 SCIE CAS CSCD 2017年第9期1879-1891,共13页
Dramatic changes in climatic conditions that supplement the biotic and abiotic stresses pose severe threat to the sustainable rice production and have made it a difficult task for rice molecular breeders to enhance pr... Dramatic changes in climatic conditions that supplement the biotic and abiotic stresses pose severe threat to the sustainable rice production and have made it a difficult task for rice molecular breeders to enhance production and productivity under these stress factors. The main focus of rice molecular breeders is to understand the fundamentals of molecular pathways involved in complex agronomic traits to increase the yield. The availability of complete rice genome sequence and recent improvements in rice genomics research has made it possible to detect and map accurately a large number of genes by using linkage to DNA markers. Linkage mapping is an effective approach to identify the genetic markers which are co-segregating with target traits within the family. The ideas of genetic diversity, quantitative trait locus(QTL) mapping, and marker-assisted selection(MAS) are evolving into more efficient concepts of linkage disequilibrium(LD) also called association mapping and genomic selection(GS), respectively. The use of cost-effective DNA markers derived from the fine mapped position of the genes for important agronomic traits will provide opportunities for breeders to develop high-yielding, stress-resistant, and better quality rice cultivars. Here we focus on the progress of molecular marker technologies, their application in genetic mapping and evolution of association mapping techniques in rice. 展开更多
关键词 分子标记技术 遗传作图 农艺性状基因 水稻品种 非生物胁迫 展望 分子育种 基因组学
在线阅读 下载PDF
Conservation status evaluation of Berberis species across the Karakoram Mountain Ranges, Pakistan using IUCN Red List Categories and Criteria 预览
4
作者 Tika Khan Imtiaz Ahmed Khan +1 位作者 Abdul Rehman Nisar Ahmed 《林业研究:英文版》 CAS CSCD 2016年第6期1385-1390,共6页
在巴基斯坦与的 Berberis 种类被危及的、高值的药用的植物重要 eco 文化,在山社区的广告和生计角色。在巴基斯坦越过咔拉在谮山脉山脉估计 Berberis 种类的地理分发,我们使用了 IUCN 红表范畴和标准(2001 ) 计算出现的程度(EOO, <... 在巴基斯坦与的 Berberis 种类被危及的、高值的药用的植物重要 eco 文化,在山社区的广告和生计角色。在巴基斯坦越过咔拉在谮山脉山脉估计 Berberis 种类的地理分发,我们使用了 IUCN 红表范畴和标准(2001 ) 计算出现的程度(EOO, <100?km<sup>2</sup>) 和占有的区域(AOO, Berberis pseudumbellata subsp 的 <10?km<sup>2</sup>) 。pseudumbellata 和 B。pseudumbellata subsp。gilgitica。过度放牧并且产地损失是关键限制人口的因素。二亚种让了对比回答到温度,举起,降水和昆虫危险性。B。pseudumbellata subsp。gilgitica 对 Gilgit-Baltistan 地方性并且在单个收割的地区成长(区域 ?>? 200 ? m a.s.l ) 。地位评估两个都揭示了那标准为极其危及的种类设置了的亚种会。它的衰退人口趋势的延长不顾可能导致它的扑灭;因此,综合保存努力是必要的。 展开更多
关键词 BERBERIS 生态的带状配列 极其危及了 出现的程度 咔拉在谮山脉 职业区域 空间分发
在线阅读 下载PDF
Isolation of Cr(Ⅵ) reducing bacteria from industrial effuents and their potential use in bioremediation of chromium containing wastewater 预览 被引量:2
5
作者 Ahmed Zahoor Abdul Rehman 《环境科学学报:英文版》 SCIE EI CAS CSCD 2009年第6期 814-820,共7页
The present study was aimed to assess the ability of Bacillus sp.JDM-2-1 and Staphylococcus capitis to reduce hexavalent chromium into its trivalent form.Bacillus sp.JDM-2-1 could tolerate Cr(Ⅵ)(4800 μg/mL) and S.ca... The present study was aimed to assess the ability of Bacillus sp.JDM-2-1 and Staphylococcus capitis to reduce hexavalent chromium into its trivalent form.Bacillus sp.JDM-2-1 could tolerate Cr(Ⅵ)(4800 μg/mL) and S.capitis could tolerate Cr(Ⅵ)(2800 μg/mL).Both organisms were able to resist Cd2+(50 μg/mL),Cu2+(200 μg/mL),Pb2+(800 μg/mL),Hg2+(50 μg/mL) and Ni2+(4000 μg/mL).S.capitis resisted Zn2+ at 700 μg/mL while Bacillus sp.JDM-2-1 only showed resistance up to 50 μg/mL.Bacillus sp.JDM-2-1 and S.capitis showed optimum growth at pH 6 and 7,respectively,while both bacteria showed optimum growth at 37°C.Bacillus sp.JDM-2-1 and S.capitis could reduce 85% and 81% of hexavalent chromium from the medium after 96 h and were also capable of reducing hexavalent chromium 86% and 89%,respectively,from the industrial effuents after 144 h.Cell free extracts of Bacillus sp.JDM-2-1 and S.capitis showed reduction of 83% and 70% at concentration of 10 μg Cr(Ⅵ)/mL,respectively.The presence of an induced protein having molecular weight around 25 kDa in the presence of chromium points out a possible role of this protein in chromium reduction.The bacterial isolates can be exploited for the bioremediation of hexavalent chromium containing wastes,since they seem to have a potential to reduce the toxic hexavalent form to its nontoxic trivalent form. 展开更多
关键词 含铬废水 生物修复 分离物 细菌 苏云金芽孢杆菌 工业 金黄色葡萄球菌 六价铬
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部 意见反馈