检索结果-南通市图书馆

Comparison of nitrate-removal efficiency and bacterial properties using PCL and PHBV polymers as a carbon source to treat aquaculture water

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2020年第2期5卷 92-98页

作者： Guozhi Luo zhiwei hou Luqi Tian Hongxin Tan Shanghai Engineering Research Center of Aquaculture(Shanghai Science and Technology Committee) Shanghai Ocean UniversityShanghai201306China Key Laboratory of Freshwater Aquatic Genetic Resources(Ministry of Agriculture of PRC) Shanghai Ocean UniversityShanghai201306China National Demonstration Center for Experimental Fisheries Science Education(Ministry of Education of PRC) Shanghai Ocean UniversityShanghai201306China

Nitrate(NO_(3)^(−))accumulation in recirculating aquaculture systems(RASs)with high stocking densities presents a problem for reared animals and the *** use of a biodegradable polymer as organic carbon for heterotrophic denitrification exhibits good performance for NO_(3)^(−)removal from wastewater.A comparison of NO_(3)^(−)–N removal efficiency and bacterial properties using polycaprolactone(PCL)and poly(3-hydroxybutyrateco-3-hydroxyvalerate)(PHBV)as carbon sources to treat aquaculture water was conducted for a 102-day *** results indicated that the NO_(3)^(−)–N removal rates of 0.27±0.07 and 0.19±0.05 g/L per day,respectively,could be achieved with influent concentrations ranging from 81.1 to 132.75 mg/L and a flow rate of 1 L/*** removal of NO_(3)^(−)–N versus consumed PCL(1:1 w/w)was significantly higher than that versus consumed PHBV(0.3:1 w/w)(P<0.05).The concentrations of effluent nitrite-nitrogen and total ammonium nitrogen were maintained at an acceptable *** bacterial community structures between the two types of reactors varied *** and Denitratisoma were the top two genera of the bacterial community in the biofilm in the PCL beads with a dominance of 26.83%and 6.67%,*** the PHBV beads,Acidovorax at 17.95%and Bdellovibrio at 6.37%were the top two *** PCL-denitrification reactor developed in this study showed better potential than the PHBV-denitrification reactor in removing NO_(3)^(−)from aquaculture water.

关键词： Denitrification Polycaprolactone Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Recirculating aquaculture system Nitrate

A unified framework of temporal information expression in geosciences knowledge system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第5期14卷 343-352页

作者： Shu Wang Yunqiang Zhu Yanmin Qi zhiwei hou Kai Sun Weirong Li Lei Hu Jie Yang Hairong Lv State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China University of Nottingham Ningbo China Faculty of Science and EngineeringNingbo 315154China Guangzhou Institute of Geography Guangdong Academy of SciencesGuangzhou 510070China University of Chinese Academy of Sciences Beijing 100101China Department of Automation Tsinghua UniversityBeijing 100084China

Time is an essential reference system for recording objects,events,and processes in the field of *** are currently various time references,such as solar calendar,geological time,and regional calendar,to represent the knowledge in different domains and regions,which subsequently entails a time conversion process required to interpret temporal information under different time ***,the current time conversion method is limited by the application scope of existing time ontologies(e.g.,“Jurassic”is a period in geological ontology,but a point value in calendar ontology)and the reliance on experience in conversion *** issues restrict accurate and efficient calculation of temporal information across different time *** address these issues,this paper proposes a Unified Time Framework(UTF)in the geosciences knowledge *** to a systematic time element parsing from massive time references,the proposed UTF designs an independent time root node to get rid of irrelevant nodes when accessing different time types and to adapt to the time expression of different geoscience ***,this UTF carries out several designs:to ensure the accuracy of time expressions by designing quantitative relationship definitions;to enable time calculations across different time elements by designing unified time nodes and structures,and to link to the required external ontologies by designing adequate *** comparing the time conversion methods,the experiment proves the UTF greatly supports accurate and efficient calculation of temporal information across different time references in SPARQL ***,it shows a higher and more stable performance of temporal information queries than the time conversion *** the advent of the Big Data era in the geosciences,the UTF can be used more widely to discover new geosciences knowledge across different time references.

关键词： Unified Time Framework(UTF) Time ontology Geosciences knowledge system Time conversion Time scale Big data

Multidimensional and quantitative interlinking approach for Linked Geospatial Data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2017年第9期10卷 923-943页

作者： Yunqiang Zhu A-Xing Zhu Jia Song Jie Yang Min Feng Kai Sun Jingqu Zhang zhiwei hou Hongwei Zhao State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingPeople’s Republic of China Department of Geography University of Wisconsin–MadisonMadisonWIUSA College of Resource and Environment University of Chinese Academy of SciencesBeijingPeople’s Republic of China School of Computer Global Land Cover FacilityDepartment of GeographyUniversity of MarylandCollege ParkMDUSA South China Normal University GuangzhouPeople’s Republic of China

Linked Data is known as one of the best solutions for multisource and heterogeneous web data integration and discovery in this era of Big ***,data interlinking,which is the most valuable contribution of Linked Data,remains incomplete and *** study proposes a multidimensional and quantitative interlinking approach for Linked Data in the geospatial *** to the characteristics and roles of geospatial data in data discovery,eight elementary data characteristics are adopted as data interlinking *** elementary characteristics are further combined to form compound and overall data interlinking *** data interlinking type possesses one specific predicate to indicate the actual relationship of Linked Data and uses data similarity to represent the correlation degree ***,geospatial data interlinking can be expressed by a directed edge associated with a relation predicate and a similarity *** approach transforms existing simple and qualitative geospatial data interlinking into complete and quantitative interlinking and promotes the establishment of high-quality and trusted Linked Geospatial *** approach is applied to build data intra-links in the Chinese National Earth System Scientific Data Sharing Network(NSTI-GEO)and data-links in NSTI-GEO with the Chinese Meteorological Data Network and National Population and Health Scientific Data Sharing Platform.

关键词： Geospatial data linked data interlinking type link predicate data similarity

Hydration of concrete containing calcium-enriched fly ash at subzero temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2007年第S1期26卷 301-305页

作者： ZHAO Yading,BA Hengjing,CUI Jinjiang,and hou zhiwei School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The compressive strength,hydration products and microstructure of concrete with calcium-enriched fly ash(CEFA) at different temperature were *** result indicates that the hydration products age of 7 d at-15 ℃ are mainly ettringite and C-S-H,and fly ash particles remain original *** curing was adapted after 7 d curing at-15 ℃.At the age of 35 d,C-S-H was found on the surface of fly ash *** hydration product of CEFA is mainly C-S-H gel,which can densify the microstructure of concrete.

关键词： calcium-enriched fly ash concrete at subzero temperature hydration products

Geospatial data ontology:the semantic foundation of geospatial data integration and sharing

在线全文

学校读者我要写书评

暂无评论

Big Earth Data 2019年第3期3卷 269-296页

作者： Kai Sun Yunqiang Zhu Peng Pan zhiwei hou Dongxu Wang Weirong Li Jia Song State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingPeople’s Republic of China University of Chinese Academy of Sciences BeijingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingPeople’s Republic of China Center for Collaborative Innovation in Baiyangdian River Basin Ecological Protection and Beijing-Tianjin-Hebei Sustainable Development BaodingPeople’s Republic of China Appraisal Center for Environment and Engineering Ministry of Ecology and EnvironmentBeijingPeople’s Republic of China f State Environmental Protection Key Laboratory of Numerical Modeling for Environment Impact Assessment BeijingPeople’s Republic of China Beijing GEOWAY Software Co. LtdBeijingPeople’s Republic of China

Effective integration and wide sharing of geospatial data is an important and basic premise to facilitate the research and applications of geographic information ***,the semantic heterogeneity of geospatial data is a major problem that significantly hinders geospatial data integration and *** are regarded as a promising way to solve semantic problems by providing a formalized representation of geographic entities and relationships between them in a manner understandable to ***,many efforts have been made to explore ontology-based geospatial data integration and ***,there is a lack of a specialized ontology that would provide a unified description for geospatial *** this paper,with a focus on the characteristics of geospatial data,we propose a unified framework for geospatial data ontology,denoted GeoDataOnt,to establish a semantic foundation for geospatial data integration and ***,we provide a characteristics hierarchy of geospatial ***,we analyze the semantic problems for each characteristic of geospatial ***,we propose the general framework of GeoDataOnt,targeting these problems according to the characteristics of geospatial *** is then divided into multiple modules,and we show a detailed design and implementation for each *** limitations and challenges of GeoDataOnt are identified,and broad applications of GeoDataOnt are discussed.

关键词： Geospatial data ontology geospatial semantics semantic heterogeneity data integration data sharing

Mutations and CpG islands among hepatitis B virus genotypes B and C in Chinese patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mutations and CpG islands among hepatitis B virus genotypes ...

政府购买公共服务的竞争性分析框架及制度机制——基于S市经验的案例研究

第十四次全国医学遗传学学术会议

作者： zhiwei hou Lianbing Li Mingfu Ma Key Laboratory of Birth Defects and Reproductive Health of National Health and Family Planning Commission Chongqing Population and Family Planning Science and Technology Research Institute

There are differences in the distribution and length of HBV CpG islands and the viral mutations contribute greatly to the development of HBV-related ***,little is known regarding the effects of such difference and mutations in HBV genotypes B and C sequences on the regulation of HBVgene expression and their clinical *** study the distribution,length and genetic trait of CpG islands in normal and mutant sequences of HBVgenotypes B and C,320 HBV isolates from Chinese patients were retrieved from *** CLUSTALX 1.83 and MethPrimer were employed to perform multiple sequence alignments and to predict CpG islands,respectively.72.0%genotype B isolates contained three conventional CpG islands,and 76.1%genotype C only contained CpG islandsⅡandⅢ.14.6%genotype B and 7.5%genotype C contained three novel CpG *** genotype B,lengths of conventional CpG islands between normal and mutant isolates exhibited substantial variations,but in genotype C,those were relatively *** islandⅡcould be"truncated"or"split"."Truncated"region mutations were associated with structural and functional abnormalities of *** of"split"CpG islandⅡin genotype B was much higher than that in genotype *** the majority of isolates from HCC and HBV-ACLF,genotype C lacked CpG island land novel ***,length and genetic trait of CpG islands in HBV genotypes B and C might affect theirmethylation status,and further affect regulation of HBV gene expression,leading to different clinical outcomes.

关键词： hepatitis B virus methylation CpG island genotype mutation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国行政管理 2016年第7期 57-63页

作者：侯志伟上海交通大学国际与公共事务学院博士后上海200030

弱竞争性是摆在当前中国政府购买公共服务制度建设中的重要问题。本研究引入亚当·斯密的分工与市场范围理论和涂尔干的"社会分工论"解释模型,构建起"竞争性—分工—市场范围"的分析框架。公共服务可以分为软服务和硬服务两种,本研究各... 详细信息

弱竞争性是摆在当前中国政府购买公共服务制度建设中的重要问题。本研究引入亚当·斯密的分工与市场范围理论和涂尔干的"社会分工论"解释模型,构建起"竞争性—分工—市场范围"的分析框架。公共服务可以分为软服务和硬服务两种,本研究各选择了一个案例,对S市政府购买养老服务和环卫服务的案例进行分析,得到如下结论:行政事务逐级分包制在政府购买实践中衍生了两项制度:一是基层政府作为购买主体的制度安排,二是基层政府培育社会力量的制度安排。在这两项制度的运作下,政府购买公共服务的市场形态表现出封闭性和割据性的特征,主要表现是:基层政府与社会力量形成了利益共同体,这种共同体对体制内外的力量形成了拒绝进入的动机和能力。这个制度机制反映了政府购买公共服务弱竞争性的问题。基于以上结论,本研究给出了政府购买服务制度建设的对策。

关键词：竞争性分工市场范围政府购买公共服务

政府购买公共服务的制度目标模式与实现路径——以上海市某服务社为例

在线全文

学校读者我要写书评

暂无评论

河北经贸大学学报 2017年第3期38卷 50-55页

作者：侯志伟上海交通大学国际与公共事务学院上海200030

中国政府购买公共服务处于全面推广阶段,制度建设也在探索和完善过程之中。在这个背景下,探索政府购买公共服务的制度目标模式并用来指导制度设计,具有十分重要的理论意义和现实价值。本质上讲,政府购买公共服务是一个市场化、社会化、... 详细信息

中国政府购买公共服务处于全面推广阶段,制度建设也在探索和完善过程之中。在这个背景下,探索政府购买公共服务的制度目标模式并用来指导制度设计,具有十分重要的理论意义和现实价值。本质上讲,政府购买公共服务是一个市场化、社会化、民主化的改革过程,这三重路径在主体、程序、内容等三个层面各有其具体的表现。在两维视角下建构政府购买公共服务的制度目标模式并运用该模式对政府购买公共服务的案例进行评价,可以发现当前政府购买公共服务的制度建设状态和存在的具体问题。政府购买公共服务制度目标模式的实现路径应该是打破市场割据、提升合同管理水平、加速行政化、实行购买和评估由第三方承担的制度安排、鼓励公共服务相关方成立团体、建立财务公开透明制度。

关键词：市场化社会化民主化政府购买公共服务制度目标模式

Safe Formation Control and Collision Avoidance for Multi-UAV Systems Using Barrier Lyapunov Function

在线全文

学校读者我要写书评

暂无评论

Safe Formation Control and Collision Avoidance for Multi-UAV...