检索结果-南通市图书馆

Studies on the Mechanism of Single Basal Application of Controlled-Release Fertilizers for Increasing Yield of Rice (Oryza sativa L.)

引用

Agricultural Sciences in China 2007年第5期6卷 586-596页

作者： TANG Shuan-hu YANG Shao-hai CHEN Jian-sheng xu pei-zhi ZHANG Fa-bao AI Shao-ying HUANG xu Soil and Fertilizer Research Institute Guangdong Academy of Agricultural Sciences Guangzhou 510640 P.R.China Fertilizer and Balanced Fertilization Laboratory College of Natural Resources and Environment Science South China Agricultural University Guangzhou 510642 P.R.China

This paper was to explore the mechanism of single basal application of controlled-release fertilizers for increasing yield of rice （Oryza sativa L.）. Pot trials and cylinder trials were carried out from 2002 to 2005 to study the influences of single basal application of 3 controlled-release fertilizers on the changes of soil available N, root development, senescence and lodging resistance at late growth stages. Results showed that at 30 days after fertilization, single basal application of controlled-release fertilizers coated with vegetal-substance （CRF1） and polymer materials （CRF3） increased soil available N to 12.0 and 147.9%, respectively, in comparison to split fertilization of rice-specific fertilizer （RSF1）. Treatments of the two CRFs obviously benefited the development of root system, resulting in greater rice root weights with extensive distribution and higher root activity. In addition, the two CRF treatments, in comparison to RSF1, enhanced chlorophyll consents of the flag leaves to 9.5 and 15.5%, and soluble protein up to 89.7 and 108.0% respectively. Application of the two CRFs also made the base of rice stems strong and large, declined the proportion of shoot and root, increased root depth index. Though relatively low K rate, single basal application of the CRF3 coated with NH4MgPO4 could also promote the development of root system, enhance root activity and some physiological functions of flag leaves. Based on these results, it was concluded that major mechanisms for increasing rice yield by single basal application of the CRFs should be attributed to grater soil available N supply, superior development of root systems, better nutrient absorption capacity, slower senescence and enhancement of lodging resistance at late stages.

关键词： rice (Oryza sativa L.) single basal fertilization controlled-release fertilizer root system available nitrogen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Troponin I, cardiac diastolic dysfunction and restrictive cardiomyopathy

引用

Acta Pharmacologica Sinica 2004年第12期25卷 3-9页

作者： xu-pei HUANG2, Jian-feng DU Department of Biomedical Science, Centerfor Molecular Biologyand Biotechnology, Florida AtlanticUniversity, Boca Raton, FL 33431, USA Department of Biomedical Science Center for Molecular Biology and Biotechnology Florida Atlantic University 美国

Cardiomyopathies are diseases of heart muscle that are associated with cardiac dysfunction. Molecular ge- netic studies performed to date have demonstrated that the damage or mutations in several sarcomeric contractile protein genes are associated with the development of the diseases. In this review, cardiac troponin I, one of the sarcomeric thin filament protein, will be discussed regarding its role in cardiac function, its deficiency-related diastolic dysfunction, and the mutation of this protein-mediated restrictive cardiomyopathy.

关键词： troponin I restrictive cardiomyopathy contractile proteins missense mutation diastole genetically modified animals cardiology

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Landscape and Its Representation in Early Modern Chinese Pictorials:1884～1937

引用

Comparative Literature:East & West 2007年第2期 85-98页

作者： xu,pei Sichuan University

作者试图通过分析早期中国画报中的景观及其表征,探索摄影作为一种新媒介、新技术对近代中国视觉文化的影响,从一个全新的角度考察近代"西学东渐"大背景下中国人如何"看世界"。作者强调了近代中国"石印画报——摄影画报"的前后继承关系... 详细信息

作者试图通过分析早期中国画报中的景观及其表征,探索摄影作为一种新媒介、新技术对近代中国视觉文化的影响,从一个全新的角度考察近代"西学东渐"大背景下中国人如何"看世界"。作者强调了近代中国"石印画报——摄影画报"的前后继承关系,通过对大量图像文本的直接比较、分析,发现摄影技术不仅带来新的观看内容,也带来新的图像形式。景观照片在清末取代景观本身,成为石印画家临摹的对象。同时,石印景观的风格也从抽象走向写实。这些演变与景观在功能上的转变相辅相成:景观不再是以前艺术家追求自我满足的工具,转而成为大众传播过程中的有效手段。进一步而言,从图像本身推进到图像所代表的观看方式,近代中国画报中景观——特别是西方景观——的观看方式呈现出一种"由远及近、由外到内"的演变过程。此过程贯穿于清末民初整个阶段,折射出中国人对西方文化逐渐转变的态度。

关键词：景观表征视觉文化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于自适应增量学习的时间序列模糊聚类算法

引用

电子学报 2019年第5期47卷 983-991页

作者：王玲徐培培北京科技大学自动化学院北京100083 北京科技大学自动化学院工业过程知识自动化教育部重点实验室北京100083

针对现存可用于时间序列的增量式模糊聚类算法往往需要设置多个控制参数的问题,本文提出了一种基于自适应增量学习的时间序列模糊聚类算法.该算法首先继承上一次聚类得到的簇结构信息以初始化当前聚类进程,然后在无需设置参数的情况下... 详细信息

针对现存可用于时间序列的增量式模糊聚类算法往往需要设置多个控制参数的问题,本文提出了一种基于自适应增量学习的时间序列模糊聚类算法.该算法首先继承上一次聚类得到的簇结构信息以初始化当前聚类进程,然后在无需设置参数的情况下自适应地搜索当前数据块中的离群样本,并自动从离群样本创建新簇,最后检查空簇识别标识确定是否需要移除部分簇以保证后续聚类过程的效率.实验结果表明所提算法对等长和不等长时间序列均具有良好的聚类准确性及运行效率.

关键词：时间序列模糊聚类自适应增量学习离群样本

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of LR,5-CV SVM,GA SVM,and PSO SVM for landslide susceptibility assessment in Tibetan Plateau area,China

引用

Journal of Mountain Science 2023年第4期20卷 979-995页

作者： ZHANG Ying-bin xu pei-yi LIU Jing HE Jian-xian YANG Hao-tian ZENG Ying HE Yun-yong YANG Chang-feng Department of Geotechnical Engineering School of Civil EngineeringSouthwest Jiaotong UniversityChengdu610031China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu610041China

The applicability of statistics-based landslide susceptibility assessment methods is affected by the number of historical *** studies have proposed support vector machine(SVM)as a small-sample learning ***,those studies demonstrated that different parameters can affect model *** optimized the SVM and obtained models as 5-fold cross validation(5-CV)SVM,genetic algorithm(GA)SVM,and particle swarm optimization(PSO)*** study compared the prediction performances of logistic regression(LR),5-CV SVM,GA SVM,and PSO SVM on landslide susceptibility mapping,to explore the spatial distribution of landslide susceptibility in the study area in Tibetan Plateau,China.A geospatial database was established based on 392 historical landslides and 392 non-landslides in the study *** used 11 influencing factors of altitude,slope,aspect,curvature,lithology,normalized difference vegetation index(NDVI),distance to road,distance to river,distance to fault,peak ground acceleration(PGA),and rainfall to construct an influencing factor evaluation *** evaluate the models,four susceptibility maps were compared via receiver operating characteristics(ROC)curve and the results showed that prediction rates for the models are 84%(LR),87%(5-CV SVM),85%(GA SVM),and 90%(PSO SVM).We also used precision,recall,F1-score and accuracy to assess the quality performance of these *** results showed that the PSO SVM had greater potential for future implementation in the Tibetan Plateau area because of its superior performance in the landslide susceptibility assessment.

关键词： Tibetan Plateau area Logistic regression Support vector machine Landslide susceptibility assessment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE SPATIAL DIVISION OF INDUSTRIES OF THE PEARL RIVER DELTA IN THE 1990s: CHARACTERISTICS AND TRENDSS

引用

Chinese Geographical Science 2001年第1期11卷 63-69页

作者： xu Yong-jian,YAN Xiao-pei,xu xue-qiang (Center for Urban and Regional Studies, Zhongshan University, Guangzhou 510275, P. R. China) Center for Urban and Regional Studies Zhongshan University Guangzhou P. R. China

The article analyzed the spatial division of industries of the Pearl River Delta (PRD) in the 1990s, a period that witnessed the deepening of the reform and opening policies and continued rapid development of the region. By adopting the index of specialization, the extent of specialization, its change and its spatial distribution in the region are measured and demonstrated. The research revealed that, despite the trend of more balanced development of the secondary sector between the PRD and the rest of the province, in the PRD, it is the unbalanced development that dominated and the spatial division of the secondary sector has been shaped. The tertiary industry has also been experiencing unbalance development and the spatial division of the tertiary sector has been emerging, its extent of concentration appearing even more evident than that of the secondary sector. The author also discussed the linkage between the spatial division of the two sectors. In the end of the paper, the trends of the spatial division of the industries in the PRD are forecasted.

关键词： Pearl River Delta spatial division of industries characteristics and trends

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A molecular toolkit to boost functional genomic studies in transformation-recalcitrant vegetable legumes

引用

Horticulture Research 2023年第5期10卷 278-281页

作者： Xinyang Wu peipei Zhang Shuting Chen Zixin Zhang Yihan Zhang Pingping Fang Kang Ning Ting Sun pei xu Key Laboratory of Specialty Agri-Product Quality and Hazard Controlling Technology of Zhejiang College of Life SciencesChina Jiliang UniversityHangzhouChina Zhejiang Lab HangzhouChina

Dear Editor Legumes,the second-largest family of crops,contribute over one-third of human dietary ***(Glycine max L.),common bean(Phaseolus vulgaris L.),pea(Pisum sativum L.),and cowpea(Vigna unguiculata L.)are among ... 详细信息

关键词： Leg crops boost

来源：

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

Conversion of Carbonyl Compounds to Olefins via Enolate Intermediate

引用

Chinese Journal of Chemistry 2019年第8期37卷 781-785页

作者： Zhi-Chao Cao pei-Lin xu Qin-Yu Luo Xiao-Lei Li Da-Gang Yu Huayi Fang Zhang-Jie Shi Department of Chemistry Fudan UniversityShanghai 200433China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China College of Chemistry Sichuan UniversityChengduSichuan 610064China

Summary of main observation and conclusion A general and efficient protocol to synthesize substituted olefins from carbonyl compounds via nickel catalyzed C-O activation of enolates was *** ketones,aldehydes were also suitable substrates for the presented catalytic system to produce di-or tri-substituted *** is worth noting that this approach exhibited good tolerance to highly reactive tertiary alcohols,which could not survive in other reported routes for converting carbonyl compounds to *** method also showed good regio-and stereo-selectivity for olefin *** mechanistic studies indicated that the reaction was accomplished through nickel catalyzed C-O activation of enolates,thus offering helpful contribution to current enol chemistry.

关键词： Carbonyl Compounds Olefins Enolate Intermediate

来源：

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

Purification and characterization of alkaline chitinase from Paenibacillus pasadenensis CS0611

引用

Chinese Journal of Catalysis 2017年第4期38卷 665-672页

作者： Xiaoxiao Guo pei xu Minhua Zong Wenyong Lou Laboratory of Applied Biocatalysis School of Food Science and Engineering South China University of Technology Guangzhou 510640 GuangdongChina State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 Guangdong China

An extracellular chitinase produced by Paenibacillus pasadenensis CS0611was purified by ammoniumsulfate precipitation,HiTrap DEAE FF and HiLoad26/600Superdex200pg column *** apparent molecular mass determined by sodium dodecyl sulfate polyacrylamide gelelectrophoresis *** optimum pH and optimum temperature of the chitinase were5.0and50°C,*** enzyme showed high stability at alkaline pH values and temperaturesbelow40°***,the metal ions Mn2+,Mg2+,and Co2+inhibited activity of the *** was active on colloidal chitin with an apparent Km of4.41mg/mL and Vmax of1.08mg/*** spectrum analysis indicated that the chitinase reacted preferentially with the glucosidicbond between GlcNAc‐*** enzymatic hydrolysate was analyzed by high‐performance liquidchromatography and thin layer chromatography,and clearly showed that a subunit of(GlcNAc)2was the main hydrolysis product.

关键词： Chitinase Purification Characterization Paenibacillus pasadenensis CS0611

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Innovative Design of Landscape Installations in Commercial Pedestrian Streets Based on Experience Needs

引用

Journal of Landscape Research 2019年第4期11卷 25-28页

作者： xu pei TANG Liying School of Architecture and Design Southwest Jiaotong University

Based on the relevant literature and case data, this paper analyzed the design elements of commercial pedestrian streets and design ideas of landscape installations based on behavioral psychological characteristics and experience requirements of users, and summarized the FST design method, that is, landscape installation design of commercial pedestrian streets needs to meet the function of commercial use and respect the spirit of place, and uses modern technology to achieve multiple experience models to meet high-level experience needs.

关键词： Experience Need Commercial pedestrian street Landscape installation

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：