检索结果-南通市图书馆

Phosphorus fertilization alters complexity of paddy soil dissolved organic matter

Journal of Integrative Agriculture 2020年第9期19卷 2301-2312页

作者： ZHANG Zhi-jian WANG Xian-zhe liang lu-yi HUANG En TAO Xing-hua College of Environmental and Resource Science Zhejiang UniversityHangzhou 310058P.R.China China Academy of West Region Development Zhejiang UniversityHangzhou 310058P.R.China Hangzhou Gusheng Agricultural Technology Company Limited Hangzhou 311108P.R.China

The structural complexity of soil dissolved organic matter(DOM)may reflect soil biogeochemical processes due to its spectral ***,the features of DOM structural complexity in paddy soil amended with long-term chemical P fertilization are still unclear,which may limit understanding of nutrient-related soil C *** collected soil samples from field experiments receiving application of 0,30,60,and 90 kg P ha–1 yr–1 to assess the effect of exogenous P on the complexity of soil DOM ***-dimensional excitation-emission matrix fluorescence analysis and enzymatic activity assay were used to determine the features of soil DOM molecular structure and the associated microbial *** results showed that P input increased the biodegradability of DOM,indicating by the increased lower molecular weight components and decreased humic degree in the DOM.P input also reduced the structural complexity of DOM with blue shifts of fluorescent *** fluorescence index andβ/αindex of DOM increased with increasing P application by 4–5%and 3–11%,respectively,while humification index decreased by 8–13%.The P input increased the abundance of bacteria and fungi by 34–167%and 159–964%,respectively,while 29–54%increments were found for theβ-1,4-glucosidase *** results implicated that P fertilization accelerated the soil DOM cycle,although the structural complexity of DOM declined,which potentially benefits soil C sequestration in paddy fields and may be a C sequestration mechanism in the P-dependent paddy.

关键词： soil carbon fertilization fluorescence humification agroecosystem

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

Aeroelastic optimization on composite skins of large aircraft wings

引用

Science China(Technological Sciences) 2012年第6期55卷 1078-1085页

作者： liang lu WAN ZhiQiang YANG Chao School of Aeronautic Science and Engineering Beijing University of Aeronautics and AstronauticsBeijing 100191China

This paper presents studies of aeroelastic optimization on composite skins of large aircraft wings subject to aeroelastic constraints and strength/strain constraints. The design variable for optimization was the ply thickness of the wing skin panels, and the structural weight was the objective function to be minimised. The impacts of three strength/strain constraints and the ply proportion of the wing skin panels on the optimization results are discussed. The results indicate that the optimal composite wings that satisfy different constraints have remarkable weight advantages over metal wing. High levels of stiffness can be achieved while satisfying the constraints regarding allowable design strains and failure criteria. The optimization results with variable-proportions indicate that wing skins with higher proportions of 0° plies from the root to the middle segment and ±45° plies outboard have a more efficient and reasonable stiffness distribution.

关键词： aeroelastic optimization large aircraft composite wing strength constraints ply proportion

来源：

维普期刊数据库

同方期刊数据库

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

Spatial Heterogeneity and Influencing Factors of HFRS Epidemics in Rural and Urban Areas:A Study in Guanzhong Plain of Shaanxi Province,China

引用

Biomedical and Environmental Sciences 2022年第11期35卷 1012-1024页

作者： ZHU Ling Li LI Yan Ping lu liang LI Shu Juan REN Hong Yan National Institute for Nutrition and Health Chinese Center for Disease Control and PreventionBeijing 100050China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Xi’an Eighth Hospital Xi’an 710061ShaanxiChina State Key Laboratory of Infectious Disease Prevention and Control National Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China

Objective The Guanzhong Plain of Shaanxi Province is a severely afflicted hemorrhagic fever with renal syndrome(HFRS)epidemic area,while HFRS prevalence has decreased in most epidemic areas in *** information is available regarding the leading fine-scale influencing factors in this highly HFRSconcentrated area and the roles of natural environmental and socioeconomic *** investigate this,two regions in the Guanzhong Plain,that is,the Chang’an District and Hu County,with similar geographical environments,different levels of economic development,and high epidemic prevalence,were chosen as representative areas of the HFRS *** Maximum entropy models were constructed based on HFRS cases and fine-scale influencing factors,including meteorological,natural environmental,and socioeconomic factors,from 2014 to *** More than 95% of the HFRS cases in the study area were located in the northern plains,which has an altitude of less than 800 m,with topography contributed 84.1% of the impact on the spatial differentiation of the HFRS *** the northern plains,precipitation and population density jointly affected the spatial differentiation of the HFRS epidemic,with contribution rates of 60.7% and 28.0%,*** comparing the influencing factors of the northern plains of Chang’an District and Hu County,we found that precipitation and the normalized difference vegetation index(NDVI)dominated the HFRS epidemic in the relatively developed Chang’an District,while land-use type,temperature,precipitation and population density dominated the HFRS epidemic in the relatively undeveloped Hu *** Topography was the primary key factor for HFRS prevalence in the Chang’an District and Hu County,and the spatial differentiation of HFRS was dominated by precipitation and population density in the northern *** with the influencing factors of the relatively developed Chang’an District,the developing Hu County was more affected

关键词： Hemorrhagic fever with renal syndrome(HFRS) Spatial heterogeneity Influencing factors Economic development stages Fine scale Maximum Entropy model

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

Response of blood endothelin-1 and nitric oxide activity in duodenal ulcer patients undergoing Helicobacter pylori eradication

引用

World Journal of Gastroenterology 2005年第7期11卷 1048-1051页

作者： Full-Young Chang Chih-Yen Chen Ching-liang lu Jiing-Chyuan luo Rei-Hwa lu Shou-Dong Lee Division of Gastroenterology

AIM: To investigate the effect of Helicobacter pylori eradication on endothelin-1 (ET-1) and nitric oxide (NO) in duodenal ulcer (DU) patients. METHODS: Sixty-six Hpylori-infected active DU patients were consecutively enrolled to receive one-week triple therapy (rabeprazole, amoxicillin and metronidazole) and then one-month rabeprazole therapy. They were asked back to determine ulcer and Hpylori status using endoscopy one month later. Thirty-seven healthy controls (H pylori +/-:17/20) were enrolled for comparison. Blood samples were collected in each visit to measure plasma ET-1 and nitrate/nitrite levels using an enzyme immunoassay kit. RESULTS: Sixty DU patients finished trial per protocol. The ulcer healing and Hpylori-eradication rates were 86.7% and 83.3%, respectively. Plasma ET-1 level in DU patients was higher than that of Hpylori-negative and positive controls (3.59±0.96 vs0.89±0.54 vs0.3±0.2 pg/mL,PluSION: Both plasma ET-1 and nitrate/nitrite levels increase in active DU patients. After an effective H pylori eradication, DU healing is associated with diminished blood ET-1 level and elevated nitrate/nitrite level.

关键词： Duodenal ulcer Endothelin-1 Helicobacter pylori Nitric oxide

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

Shear-critical reinforced concrete columns under various loading rates

引用

Frontiers of Structural and Civil Engineering 2014年第4期8卷 362-372页

作者： Witarto WITARTO liang lu Rachel Howser ROBERTS Y. L. MO Xilin lu Department of Civil and Environmental Engineering University of Houston Houston TX 77004 USA College of Civil Engineering Tongji University Shanghai 200092 China Energo Engineering A KBR Company Houston TX 77002 USA

This paper presents an experimental study of shear-governed reinforced concrete columns subjected to different loading rates. Four typical short columns were tested cyclically with loading rate of 0.05, 1, 3, and 5 Hz, simulating seismic load. Test result indicated that the loading rate does not affect the column behavior when the rate is up to 5 Hz. Furthermore, Carbon Nano-Fiber Aggregates （CNFAs） were utilized as internal sensors to detect the damage in the column. The test result shows that the CNFAs work well sensing the structural behavior. The CNFA output was further quantitatively correlated to the structural damage level. Finally, a finite element analytical model was constructed to describe the behavior of short columns with shear failure. The analytical model successfully modeled the cyclic loading test results.

关键词： reinforced concrete columns shear failure loading rate Carbon Nano-Fiber Aggregates (CNFAs) finite element analysis OpenSees

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

Effect of thermal acclimation on thermal preference, resistance and locomotor performance of hatchling soft-shelled turtle

引用

Current Zoology 2013年第6期59卷 718-724页

作者： Mei-Xian WU Ling-Jun HU Wei DANG Hong-liang lu Wei-Guo DU Hangzhou Key Laboratory for Animal Adaptation and Evolution School of Life and Environmental Sciences HangzhouNormal University Hangzhou 310036 China Xiaoshan College of Science and Technology Zhejiang Ocean University Hangzhou 311258 China Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing100101 China

The significant influence of thermal acclimation on physiological and behavioral performance has been documented in many ectothermic animals, but such studies are still limited in turtle species. We acclimated hatchling soft-shelled turtles Pelodiscus sinensis under three thermal conditions （10, 20 and 30~C） for 4 weeks, and then measured selected body temperature （Tsel）, critical thermal minimum （CTMin） and maximum （CTM^x）, and locomotor performance at different body temperatures. Thermal acclimation significantly affected thermal preference and resistance of P sinensis hatchlings. Hatchling turtles accli- mated to 10~C selected relatively lower body temperatures and were less resistant to high temperatures than those acclimated to 20~C and 30~C. The turtles＇ resistance to low temperatures increased with a decreasing acclimation temperature. The thermal re- sistance range （i.e. the difference between CTM^x and CTMin, TRR） was widest in turtles acclimated to 20~C, and narrowest in those acclimated to 10~C. The locomotor performance of turtles was affected by both body temperature and acclimation tem- perature. Hatchling turtles acclimated to relatively higher temperatures swam faster than did those acclimated to lower temperatures. Accordingly, hatchling turtles acclimated to a particular temperature may not enhance the performance at that temperature. Instead, hatchlings acclimated to relatively warm temperatures have a better performance, supporting the ＂hotter is better＂ hypothesis.

关键词： Pelodiscus sinensis Thermal acclimation Thermal resistance Locomotor performance

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

Meta-analysis on the epidemiology of gastroesophageal reflux disease in China

引用

World Journal of Gastroenterology 2022年第45期28卷 6410-6420页

作者： Tai-liang lu Shao-Rong Li Jia-Min Zhang Chao-Wu Chen Department of Gastrointestinal Surgery Hunan Provincial People's HospitalThe First Affiliated Hospital of Hunan Normal UniversityChangsha 410005Hunan ProvinceChina Operating Room Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120Guangdong ProvinceChina

BACKGROUND No large-scale epidemiological survey on the prevalence of gastroesophageal reflux disease(GERD)in China has been *** has a large population and a complex geographical *** is important to understand the prevalence and spatial distribution of GERD in *** To explore the prevalence and the spatial,temporal,and population distributions of GERD in the natural Chinese *** We searched Chinese and English databases for literature on the prevalence of GERD in the natural Chinese *** prevalence of GERD was pooled using a random-effects meta-analysis *** analysis was performed according to time,region,and *** used ArcGIS software to draw statistical maps and trend analysis *** autocorrelation analysis was carried out using Geoda *** correlation analysis was used to assess the spatial distribution relationship between GERD and upper digestive tract *** Altogether,70 studies involving 276014 individuals from 24 provinces of China were *** overall pooled prevalence of GERD was 8.7%(95%CI:7.5%-9.9%)in China's *** the past two decades,the prevalence of GERD in China has increased from 6.0%to 10.6%.GERD was more common in people aged 40-60,with body mass index≥24,and of Uygur *** prevalence was higher in the west and east than in the centre,and there may be a local spatial autocorrelation between the Qinghai-Tibet Plateau and the *** was correlated with gastric(r=0.421,P=0.041)and oesophageal tumours(r=0.511,P=0.011)in spatial *** GERD is becoming common in *** prevalence differs by region and *** development of appropriate strategies for the prevention and treatment of GERD is needed.

关键词： China Meta-analysis Gastroesophageal reflux disease Prevalence Epidemiology Spatiotemporal trends

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

Numerical Simulation Study of Goaf Methane Drainage and Spontaneous Combustion Coupling

引用

Journal of China University of Mining and Technology 2007年第4期17卷 503-507页

作者： LI Zong-xiang lu Zhong-liang WU Qiang ZHANG Ai-ran College of Vocational Liaoning Technical University Fuxin Liaoning 123000 China School of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan 454003 China Heilongjiang Institute of Science and Technology Harbin Heilongjiang 123000 China School of Energy and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

In order to study the coupling problem between methane drainage and spontaneous combustion of residual coal in the collapsed zone after mining ignitable coal seams with high methane,we have analyzed the effects of differ-ent methane drainage modes on spontaneous combustion of residual coal through numerical simulation. The results show that deep and large flux methane drainage modes increases the air leakage from work faces to the goaf and formed new spontaneous combustion zones induced by drainage near vents,which increases the risk of self-ignition of coal—reducing the self-ignition period and enlarging the scale of self-ignition. The spontaneous upstream combustion oxidation of the main fire zone can be suppressed when both drainage and nitrogen injection were adopted. Our research results provide an effective technical measure and theoretical basis to determine the best methane drainage scheme and drainage parameters.

关键词： goal methane drainage spontaneous combustion multiphase gas flow field finite element

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

Regenerative medicine in China:main progress in different fields

引用

Journal of Medical Colleges of PLA(China) 2016年第3期31卷 140-152页

作者： Biao Cheng Shu-liang lu Xiao-Bing Fu Medical College of PLA General Hospital of PLACollege of Life SciencesBeijing 100853 China The Key Laboratory of Trauma Treatment & Tissue Repair of Tropical Area of PLA Guangzhou 510010 China Shanghai Burns Institute Ruijin HospitalShanghai Jiaotong University Shanghai 200025 China

Regenerative medicine(RM) is an emerging interdisciplinary field of research and China has developed the research quickly and impressed the world with numerous research findings in stem cells,tissue engineering,active molecules and gene *** directions are induced differentiation of induced pluripotent stem and embryo stem cells as well as somatic stem cell differentiation potential and their application in trauma,burns,diseases of aging and nerve *** products Activ Skin and bone repair scaffolds have been approved and are applied in the clinic,and similar products are being *** 10 engineered growth-factor drugs for repair and regeneration have been approved and are used in the *** therapy,therapeutic cloning and xenotransplantation are some of the strategies being ***,China needs to develop standards,regulations and management practices suitable for the healthy development of *** that should be strengthened include sound administrative systems,laws,and technical specifications and guidelines;conservation of stem cell resources;emphasis on training and retention of talented stem cell researchers;and reasonable allocation of resources,diversification of investment and breakthroughs in key ***,broad and deep international cooperation is necessary.

关键词： Regenerative medicine Stem cells Tissue engineering China

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

Cooperative Enhancement of Cost Threshold in the Spatial N-Person Snowdrift Game

引用

Chinese Physics Letters 2012年第8期29卷 301-304页

作者： lu Dong-liang ZHANG Hong-Bin GE Juan XU Chen School of Computer Science and Technology Soochow UniversitySuzhou 215006 School of Physical Science and Technology Soochow UniversitySuzhou 215006

We study the cooperative behaviour of the N-person snowdrift game on a square lattice with different neighbourhoods and the cost threshold M for the *** apply the imitation mechanism for the players and find that there is an optimal frequency of cooperation fC as M varies in the game and the peak of fC shifts to higher M when more neighbours on the lattice are involved in the *** a given cost-to-benefit ratio r,the system shows discontinuous phase transitions and the behaviour of fC vs M shows step-like *** construct payoff level structures and find that the above features can be understood by analyzing the transition behaviour between the payoff *** variations of r and M are equivalent to tune the payoff level *** plateaus in the step-like structure have similar payoff level structures and the discontinuous jumps correspond to different payoff level structures.

关键词： behaviour discontinuous apply

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：