检索结果-南通市图书馆

Soil properties and not plant factors affect both abundant and rare microbial taxa after thinning in a mixed stand of Cunninghamia lanceolata and Sassafras tzumu

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第2期35卷 81-94页

作者： Wanxia Peng Tongqing Song Hu Du Feng Wang Fuping Zeng Yang Wang shulin chen Yinzhu chen Key Laboratory of Agro‑Ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125People’s Republic of China Guangxi Industrial Technology Research Institute for Karst Desertification Control Nanning 530001People’s Republic of China Huanjiang Observation and Research Station for Karst Ecosystems Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125People’s Republic of China Hubei Ecology Polytechnic College Wuhan 430200People’s Republic of China Hubei Tongshan Damushan State Forest Farm Tongshan 437652People’s Republic of China

Thinning is an effective management step for sustainable forest development,yet less attention is paid to the restoration of soil microbiota after *** this study,both abundant and rare soil microbial communities(i.e.,bacterial,fungal),were evaluated under various thinning treatments in a mixed stand of Cunninghamia lanceolata and Sassafras tzumu using Mi Seq *** did not significantly change either abundant or rare bacterial and fungal community composition,but affected their alpha *** Shannon–Wiener indexes of rare fungal taxa under medium thinning were significantly lower than in the light thinning(P<0.05 level).Xanthobacteraceae dominated the abundant bacterial taxa,and Saitozyma and Mortierlla the abundant fungal *** most common rare bacterial taxa varied;there was no prevalent rare fungal taxa under different *** addition,soil available nitrogen,total phosphorus,and p H had significant effects on rare bacterial ***,especially available phosphorus,but not nitrogen,affected abundant and rare soil *** results indicate that soil properties rather than plant factors affect abundant and rare microbial communities in soils of mixed ***,through mediating soil properties,influences both abundant and rare bacterial and fungal communities in the mixed *** and *** stand.

关键词： Diversity Abundant taxa Rare taxa Thinning Mixed stand

Demonstration of normally-off p-channel GaN transistor with high threshold voltage and low subthreshold swing based on single p-GaN

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第09期67卷 348-349页

作者： Yangfeng LI Zian DONG Shuai chen Qin WANG Tong LI shulin chen Kun ZHENG Jie ZHANG Guojian DING Yang WANG Haiqiang JIA Rong YANG Lei LIAO Changsha Semiconductor Technology and Application Innovation Research Institute College of Semiconductors (College of Integrated Circuits) Hunan University Hunan San'an Semiconductor Co. Ltd. Songshan Lake Materials Laboratory

GaN outperforms silicon in applications with high power and high frequency owing to the high critical electric field and high electron mobility. However, the hole-based GaN transistors which are pivotal to the GaN-based CMOS circuits and high-side switching are still under investigation. Two-dimensional hole gas(2DHG) has been used to demonstrate the p-channel GaN field-effect-transistors(FETs) [1–5].

关键词： MOSFETS

基于手机App使用大数据的居民线上生活空间结构初探——以武汉市都市发展区为例

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地理研究 2024年第4期43卷 966-984页

作者：牛强陈树林伍磊武汉大学城市设计学院武汉430072 湖北省人居环境工程技术研究中心武汉430072

信息时代,居民生活逐渐向线上转移,已有研究表明线上生活推动了相应生活空间的重构,但其空间结构及成因仍待系统研究。本文选取与居民日常生活紧密相关的八类线上生活,利用武汉市联通用户手机App使用数据,以规则网格为单位,基于这些App... 详细信息

信息时代,居民生活逐渐向线上转移,已有研究表明线上生活推动了相应生活空间的重构,但其空间结构及成因仍待系统研究。本文选取与居民日常生活紧密相关的八类线上生活,利用武汉市联通用户手机App使用数据,以规则网格为单位,基于这些App的使用人数占比和人均使用时长构建八类线上生活的综合使用指数,而后利用冷热点分析和层次聚类,初步探究了武汉市居民线上生活的空间结构。发现其与传统生活存在很大差异:(1)就普及程度和使用强度而言,除外卖生鲜外,其他七类均遵循高值指标和热点多分布于郊区的反中心化规律,部分活动还呈现泛中心化的特征。(2)从热门活动的数量和内容来看,中心城区外围热门活动数量多于核心区,线上线下融合型活动居多;近郊区核心区热门活动数量多,各类线上活动发展得较为均衡;近郊区外围热门活动数量少,热门活动多为完全线上型。(3)总结上述特征,居民线上生活空间呈现“环形山”形态的圈层式扇形镶嵌结构。线上生活因弥补了郊区传统生活设施的不足而呈现与之互补的反中心圈层递增规律,同时,地理区位、建设条件、人口构成等因素影响下的线上生活差异使得不同人群集聚片区以扇形板块镶嵌其中。本文从线上生活的角度补充了传统居民生活空间理论,系统地总结了居民线上生活的空间结构,为信息时代城市生活空间的建设提供了参考。

关键词：生活空间结构线上生活手机App使用数据信息时代环形山结构

在线全文

学校读者我要写书评

暂无评论

基于秦腔蟒袍元素的虚拟仿真及服装设计

辽宁丝绸 2024年第2期 12-13,25页

作者：杨凯陈姝霖常熟理工学院纺织服装与设计学院江苏常熟215500

旨在通过对秦腔蟒袍的认识和分析,尝试对秦腔蟒袍进行虚拟仿真,并借鉴秦腔服装元素进行现代时装设计,以实现秦腔服装文化的创新与传承。通过文献综述和实地调查,了解秦腔蟒袍的历史发展、结构特点、图案含义等方面的文化背景,利用秦腔... 详细信息

旨在通过对秦腔蟒袍的认识和分析,尝试对秦腔蟒袍进行虚拟仿真,并借鉴秦腔服装元素进行现代时装设计,以实现秦腔服装文化的创新与传承。通过文献综述和实地调查,了解秦腔蟒袍的历史发展、结构特点、图案含义等方面的文化背景,利用秦腔服装元素进行现代时装设计,从而能够体现出秦腔服装文化的创新和发展。

关键词：秦腔蟒袍虚拟服装 3D服装复原戏曲服装

Industrial Biosystems Engineering and Biorefinery Systems

在线全文

学校读者我要写书评

暂无评论

生物工程学报 2008年第6期24卷 940-945页

作者： shulin chen Institute of Microbiology Chinese Academy of Sciences Beijing 1 O0101 ChinaDepartment of Biological Systems Engineering Washington State University USA

The concept of Industrial Biosystems Engineering (IBsE) was suggested as a new engineering branch to be developed for meeting the needs for science, technology and professionals by the upcoming bioeconomy. With emphasis on systems, IBsE builds upon the interfaces between systems biology, bioprocessing, and systems engineering. This paper discussed the background, the suggested definition, the theoretical framework and methodologies of this new discipline as well as its challenges and future development.

关键词：生物工程生物系统生物技术发展现状

Process-scheme-driven automatic construction of NC machining cell for aircraft structural parts

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第5期26卷 1324-1335页

作者： chen shulin Zheng Guolei Zhou Min Du Baorui Chu Hongzhen School of Mechanical Engineering and Automation Beihang University Shenyang Aircraft Industry (Group) Corporation Ltd.

In order to enhance the NC programming efficiency and quality of aircraft structural parts （ASPs）, an intelligent NC programming pattern driven by process schemes is presented. In this pattern, the NC machining cell is the minimal organizational structure in the technological process, consisting of an operation machining volume cell, and the type and parameters of the machining operation. After the machining cell construction, the final NC program can be easily obtained in a CAD/CAM system by instantiating the machining operation for each machining cell. Accordingly, how to automatically establish the machining cells is a key issue in intelligent NC program- ming. On the basis of the NC machining craft of ASP, the paper aims to make an in-depth research on this issue. Firstly, some new terms about the residual volume and the machinable volume are defined, and then, the technological process is modeled with a process scheme. Secondly, the approach to building the machining cells is introduced, in which real-time complement machining is mainly considered to avoid interference and overcutting. Thirdly, the implementing algorithm is designed and applied to the Intelligent NC Programming System of ASP. Finally, the developed algorithm is validated through two case studies.

关键词： Aircraft structural part (ASP) Automatic programming Machining cell Process planning Process scheme Residual volume

Soil properties and not plant factors affect both abundant and rare microbial taxa after thinning in a mixed stand of Cunninghamia lanceolata and Sassafras tzumu

在线全文

学校读者我要写书评

暂无评论

Annealing-enhanced interlayer coupling interaction in GaS/MoS2 heterojunctions

林业研究（英文版） 2024年第2期 85页

作者： Wanxia Peng Tongqing Song Hu Du Feng Wang Fuping Zeng Yang Wang shulin chen Yinzhu chen

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第7期28卷 486-489页

作者： Xiuqing Meng shulin chen Yunzhang Fang Jianlong Kou Zhejiang Provincial Key Laboratory of Solid State Optoelectronic Devices Zhejiang Normal University

Fabrication of large-area atomically thin transition metal dichalcogenides is of critical importance for the preparation of new heterojunction-based *** this paper, we report the fabrication and optical investigation of large-scale chemical vapor deposition(CVD)-grown monolayer MoS2 and exfoliated few-layer GaS *** revealed by photoluminescence(PL) characterization, the as-fabricated heterojunctions demonstrated edge interaction between the two *** heterojunction was sensitive to annealing and showed increased interaction upon annealing at 300℃ under vacuum conditions, which led to changes in both the emission peak position and intensity resulting from the strong coupling interaction between the two ***-temperature PL measurements further confirmed the strong coupling *** addition, defect-related GaS luminescence was observed in our few-layer GaS, and the PL mapping provided evidence of edge interaction coupling between the two *** findings are interesting and provide the basis for creating new material systems with rich functionalities and novel physical effects.

关键词： chemical vapor deposition(CVD) growth two-dimensional(2D) heterojunctions annealing strong coupling

在线全文

学校读者我要写书评

暂无评论

妊娠期奶牛黄体细胞的分离鉴定及培养特性

畜牧兽医学报 2024年第5期55卷 2214-2225页

作者：费国庆宁致远赵泽芳刘艳秋刘腾飞李贤丛日华陈鸿陈树林西北农林科技大学动物医学院杨凌712100

旨在研究妊娠期奶牛黄体细胞的分离、纯化、鉴定及体外培养生物学特性。本研究通过采集健康荷斯坦奶牛的妊娠期黄体组织,利用Ⅱ型与Ⅳ型胶原酶联合消化法分离奶牛黄体细胞(bovine luteal cells, BLCs),通过Percoll不连续密度梯度离心法... 详细信息

旨在研究妊娠期奶牛黄体细胞的分离、纯化、鉴定及体外培养生物学特性。本研究通过采集健康荷斯坦奶牛的妊娠期黄体组织,利用Ⅱ型与Ⅳ型胶原酶联合消化法分离奶牛黄体细胞(bovine luteal cells, BLCs),通过Percoll不连续密度梯度离心法纯化获得高纯度的BLCs。运用3β-HSD活细胞染色法、油红O脂滴染色法鉴定BLCs的纯度,借助免疫组织化学染色法、免疫荧光染色检测BLCs特异性标志物催产素和突触素。ELISA法检测细胞培养上清液中孕酮;G显带核型分析BLCs染色体、CCK-8法测定BLC生长曲线和血清依赖性结合流式细胞术检测细胞周期分析BLCs的体外培养特性。结果表明,1)利用胶原酶消化法和Percoll不连续密度梯度离心法可一次性分离纯化获得大量高纯度的BLCs;2)3β-HSD染色、油红O染色结果显示,分离纯化所得BLCs细胞类型均匀,其形态呈不规则多边形的典型上皮细胞样,胞核大,胞质丰富,有小脂滴弥散分布;3)免疫荧光结果表明,BLCs可表达催产素和突触素等黄体细胞的特异性标志物;4)BLCs培养上清中孕酮的浓度呈时间依赖性;5)核型分析结果显示,黄体细胞由30对染色体组成,包括29对常染色体和一对XX性染色体,CCK-8及流式结果显示,BLCs在体外培养过程中具有稳定的增殖活性。综上所述,本研究成功分离纯化获得具有典型生物学特性的高纯度BLCs,并提供了一套完善的BLCs分离、纯化、鉴定及体外培养的方法,可为体外研究黄体的发育、退化及其功能调控提供稳定的细胞模型和技术参考。

关键词：奶牛黄体细胞分离培养生物学特性

维普期刊数据库博看期刊