检索结果-南通市图书馆

Evidence of the Precipitates in the V-Shaped Defects of Undoped GaN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第1期16卷 47-49页

作者： KANG Jun-yong huang qi-sheng OGAWA Tomoya Department of Physics Xiamen UniversityXiamen 361005 Department of Physics Gakushuin UniversityMejiroTokyo 171Japan

Precipitates in undoped GaN epilayers with specular surfaces grown on sapphire substrates were imaged by super high-resolution electron microscopy(HREM)and analyzed by energy-dispersive x-ray spectrometry(EDXS).The HREM images of the precipitates appeared more or less hexagonal intersection with several ten-nanometer large,which is the same as that of the V-shape *** EDXS spectra of the precipitates were mainly composed of the characteristic x-rays of oxygen,carbon,and gallium *** results suggest that the precipitates nucleate at the pinholes of the V-shape cavities and grow as the GaN growth.

关键词： shape Defects hexagonal

Effects of N Management on Yield and N Uptake of Rice in Central China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2012年第12期11卷 1993-2000页

作者： PAN sheng-gang huang sheng-qi ZHAI Jing WANG Jing-ping CAO Cou-gui CAI Ming-li ZHAN Ming TANG Xiang-ru Key Laboratory of Huazhong Crop Physiology Ecology and Production Ministry of Agriculture/College of Plant Science & Technology Huazhong Agricultural University College of Agriculture South China Agricultural University

Efficient N fertilizer management is critical for the economic production of rice and the long-term protection of environmental quality. A field experiment was designed to study the effects of N fertilizer management practices on grain yield and N uptake office. The experiment was laid out in the randomized complete block design with four replications in Central China during 2008 and 2009. Five N treatments denoted as No, NIsoA, N15oB, N24OA, and N24oB, respectively, were studied. NO represented no N application and served as a control, N15OA and N15oB indicated the total N application of 150 kg N ha-I but with two different application schedules （A and B） across the early stage of rice growth. Schedule A was applied as follows： 40% basal, 30% at 10 d after transplanting （DAT） and 30% at 36 DAT （nearly at the panicle initiation stage）, while schedule B was as follows： 30% at basal, 20% at 10 DAT, and 50% at 36 DAT. Similarly, N240A and N240B indicated the total N application of 240 kg N ha-1 with schedules A and B as described above. To quantify N uptake from fertilizer and soil, a 15N experiment was also conducted within the main experimental field, with micro-plots. Grain yields were significantly increased as N rates increased from 0 to 240 kg N ha-1. At the same rate, splitting N application as schedule B significantly increased the grain yield, spikelets per panicle, percentage of ripened grain, and 1 000-grain weight, compared with the N application according to schedule A. Mean rice recovery of N fertilizer by ~SN tracing method ranged from 25.39% at N24oA to 34.89% at NIsoB, however, N fertilizer residual rate in the soil ranged from 12.40% at N240A to 16.61% at N^s0w About 31.5 and 28.5% of total uptake of ~SN derived from basal fertilizer was absorbed at panicle initiation and heading stages, respectively. However, 65.6-92.5% of total uptake of 15N derived from topdressing fertilizer was absorbed at the heading stage. Based on yield and nitrogen recovery e

关键词： 15SN N fate N management recovery rice

在线全文

学校读者我要写书评

暂无评论

模糊语言英译对比之文化视域

上海翻译 2005年第4期 51-55页

作者：张琦黄琛琪湖州师范学院外国语学院湖州313000

翻译的核心是语言活动,但更应是一种社会行为,一种不铜民族之间的文化交流和传通。文化是语言活动的大环境,而语言又通过多种多样的表达方式折射文化,模糊语言乃其中一种。它是语言表达的实际需要,也是提升语言表达层次和效果的必要手... 详细信息

翻译的核心是语言活动,但更应是一种社会行为,一种不铜民族之间的文化交流和传通。文化是语言活动的大环境,而语言又通过多种多样的表达方式折射文化,模糊语言乃其中一种。它是语言表达的实际需要,也是提升语言表达层次和效果的必要手段。不同译者对模糊语言不同的英译处理,反映了不同文化因素对译文的影响。

关键词：文化视域模糊语言英译对比

Fe_2B-Mo_2FeB_2基金属陶瓷的显微组织与性能

在线全文

学校读者我要写书评

暂无评论

中国有色金属学报 2015年第4期25卷 1012-1017页

作者：魏祥陈志国黄奇胜中南大学材料科学与工程学院长沙410083 湖南人文科技学院机电工程系娄底417000

采用XRD、SEM及EPMA等方法研究Fe2B-Mo2FeB2基系列金属陶瓷的显微组织与性能。结果表明:Fe2B-Mo2FeB2基系列金属陶瓷的相组成均为Fe2B相、Mo2FeB2相、Fe3B相及少量Fe基黏结相,C及Mo原子分别部分置换Fe3B相中的B及Fe原子是该相能稳定存... 详细信息

采用XRD、SEM及EPMA等方法研究Fe2B-Mo2FeB2基系列金属陶瓷的显微组织与性能。结果表明:Fe2B-Mo2FeB2基系列金属陶瓷的相组成均为Fe2B相、Mo2FeB2相、Fe3B相及少量Fe基黏结相,C及Mo原子分别部分置换Fe3B相中的B及Fe原子是该相能稳定存在于室温的重要原因。随着Mo含量的增加,金属陶瓷的硬度略有提高,抗弯强度由371 MPa增至833 MPa,提高452 MPa,增幅达到121.8%;金属陶瓷中长棒状Mo2FeB2相与Fe3B相复合组织含量增加的同时,Fe2B相含量减少是金属陶瓷获得优异性能的原因。

关键词： Fe2B相 Fe2B-Mo2FeB2基金属陶瓷显微组织性能

在线全文

学校读者我要写书评

暂无评论

赣东北晚三叠世安源组植物群

地球科学（中国地质大学学报） 2009年第3期34卷 405-411页

作者：熊鑫琪黄其胜喻建新陈建华中国地质大学逸夫博物馆湖北武汉430074 中国地质大学地球科学学院湖北武汉430074 中国地质大学生物地质与环境地质教育部重点实验室湖北武汉430074

通过对赣东北上饶地区宋村、司铺和东山村3条剖面保存的植物化石全面研究,讨论了赣东北安源组地层分布特征,安源植物群的组成、特征及其地质时代.鉴定并统计安源植物群有28属60种,其中苏铁类及本内苏铁类11属33种,占植物群总数55.0%,居... 详细信息

通过对赣东北上饶地区宋村、司铺和东山村3条剖面保存的植物化石全面研究,讨论了赣东北安源组地层分布特征,安源植物群的组成、特征及其地质时代.鉴定并统计安源植物群有28属60种,其中苏铁类及本内苏铁类11属33种,占植物群总数55.0%,居植物群首位;真蕨类5属11种,占植物群总数18.3%,居植物群第2位;种子蕨4属6种,占植物群总数10.0%;有节类2属3种,占植物群3.0%,然而丰度高;银杏类4属5种,占8.3%,松柏类及繁殖器官2属2种,占3.4%.该植物群归于晚三叠世Ptilozamites-Anthrophyopsis组合.安源植物群组成分子中,喜湿植物14种,占植物群23.3%,耐旱植物46种,占植物群76.7%,属于半潮湿型.喜热植物45种,占植物群75.0%,广温植物15种,占植物群25.0%,属炎热型,代表中国南方滨海型热带亚热带半潮湿气候.

关键词：晚三叠世安源组地层学植物群赣东北.

在线全文

学校读者我要写书评

暂无评论

半导体光电子材料中的缺陷

厦门大学学报（自然科学版） 2001年第2期40卷 267-276页

作者：康俊勇黄启圣厦门大学物理学系福建厦门361005

介绍近年来在族氮化物和 - V化合物缺陷等方面的一些研究进展 .并着重展示对族氮化物中黄色发光带、纳米管、穿透位错、龟裂和沉积物 ,以及 - V化合物中 Fe杂质和 DX中心能级精细结构等研究的结果 .

关键词：缺陷 Ⅲ氮化物 Ⅲ-Ⅴ化合物半导体电子材料黄色发光带纳米管穿透位错

在线全文

学校读者我要写书评

暂无评论

面向PI集装箱的组合适配装箱算法

大连海事大学学报 2021年第4期47卷 39-46,64页

作者：张煜黄啟盛李文锋武汉理工大学物流工程学院武汉430063

针对PI(Physical Internet)集装箱与货物的适配问题,考虑PI集装箱标准化、模块化、可扩展的特性以及货物装箱的体积、方向、完全支撑等约束,通过PI集装箱模块化重组,构建与货物适配的组合式PI集装箱,目标是PI集装箱的空间利用率最大化.... 详细信息

针对PI(Physical Internet)集装箱与货物的适配问题,考虑PI集装箱标准化、模块化、可扩展的特性以及货物装箱的体积、方向、完全支撑等约束,通过PI集装箱模块化重组,构建与货物适配的组合式PI集装箱,目标是PI集装箱的空间利用率最大化.结合PI集装箱组合适配装箱问题的特性,设计一种组合适配装箱算法,包含货物分类、货物装箱、箱体组合等三个步骤.在货物装箱步骤中,嵌套调用基于粒子群算法的改进模因算法求解货物装箱顺序和位置,该算法引入多种群变异策略以提高算法前期搜索质量,引入路径重连技术和扰动操作防止算法陷入局部最优.在多批量少货类和少批量多货类两种实验场景下进行求解,并通过算法对比验证了改进模因算法的有效性.

关键词： PI集装箱组合适配装箱算法改进模因算法

在线全文

学校读者我要写书评

暂无评论

工业锅炉供热节能环保工作的管理和实践

节能技术 2007年第1期25卷 56-60,63页

作者：黄生琪武汉生物制品研究所湖北武汉430060

本文分析了工业锅炉热效率低的原因,重点介绍了如何加强生产管理,提高锅炉效率、降低供热损失、注重环保的方法,实现了供热系统经济节能和环保运行,可供行政管理人员、锅炉房管理人员和锅炉技术人员参考。

关键词：锅炉经济运行环保管理

Meningeal lymphatic vessel crosstalk with central nervous system immune cells in aging and neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 763-778页

作者： Minghuang Gao Xinyue Wang Shijie Su Weicheng Feng Yaona Lai Kongli huang Dandan Cao qi Wang Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhouGuangdong ProvinceChina Institute of Clinical Pharmacology Guangzhou University of Chinese MedicineGuangzhouGuangdong ProvinceChina The Sixth Affiliated Hospital Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina

Meningeal lymphatic vessels form a relationship between the nervous system and periphery, which is relevant in both health and disease. Meningeal lymphatic vessels not only play a key role in the drainage of brain metabolites but also contribute to antigen delivery and immune cell activation. The advent of novel genomic technologies has enabled rapid progress in the characterization of myeloid and lymphoid cells and their interactions with meningeal lymphatic vessels within the central nervous system. In this review, we provide an overview of the multifaceted roles of meningeal lymphatic vessels within the context of the central nervous system immune network, highlighting recent discoveries on the immunological niche provided by meningeal lymphatic vessels. Furthermore, we delve into the mechanisms of crosstalk between meningeal lymphatic vessels and immune cells in the central nervous system under both homeostatic conditions and neurodegenerative diseases, discussing how these interactions shape the pathological outcomes. Regulation of meningeal lymphatic vessel function and structure can influence lymphatic drainage, cerebrospinal fluid-borne immune modulators, and immune cell populations in aging and neurodegenerative disorders, thereby playing a key role in shaping meningeal and brain parenchyma immunity.

关键词： central nervous system meningeal lymphatic vessels immunity myeloid cells lymphatic cells neurodegenerative disease