检索结果-南通市图书馆

A Stakeholder-Guided Collaborative Approach to Improve Water Quality in a Nutrient Surplus Watershed

Journal of Water Resource and Protection 2014年第6期6卷 571-582页

作者： hector german rodriguez Jennie Popp Edward Gbur John Pennington Agricultural Statistics Laboratory University of Arkansas Fayetteville USA Beaver Watershed Alliance Fayetteville USA Department of Agricultural Economics and Agribusiness University of Arkansas Fayetteville USA

The need for water quality improvement in nutrient surplus watersheds is a pressing issue on the agenda of some government agencies and environmental organizations. Including the water quality perceptions of different affected stakeholder groups in the decision-making process may help in addressing this issue. Unfortunately, there is a lack of published research focusing specifically on understanding how Arkansas stakeholders’ perceptions of water quality issues can be used to build and implement comprehensive and workable water quality management plans. Therefore, the objective of this study was to use a stakeholder-guided collaborative approach to help research and outreach personnel to understand water quality perceptions of key stakeholders and to integrate stakeholder engagement in both the decision-making process and in the implementation of water quality management strategies within the Lincoln Lake Watershed in northwest Arkansas. Two key stakeholder groups (i.e., Locals—residents and agricultural producers—and Outsiders—water quality specialist across the state) were surveyed to assess their perceptions regarding: 1) causes of watershed water quality problems, 2) parties responsible for water quality improvement, 3) effectiveness and affordability of best management practices to reduce water quality degradation, and 4) the stakeholders’ interactions with county, state and federal government. A total of 209 complete surveys (49% response rate) were received. Survey responses were compared to determine if significant differences existed between the two stakeholder groups’ perceptions of water quality performing Fisher’s exact tests. Results from the study showed that water quality is still perceived as an issue in the Lincoln Lake Watershed. Significant differences were found between the two stakeholder groups’ perceptions regarding: 1) different groups’ contributions to water degradation, 2) groups’ responsibilities for cleanup, 3) effectiveness of five best

关键词： Stakeholders’ Perceptions Environmental Decision Making Best Management Practices Nutrient Surplus Watershed Watershed Management

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

Pregnancies established through intracytoplasmic sperm injection (ICSI) using spermatozoa with dysplasia of fibrous sheath

引用

Asian Journal of Andrology 2000年第2期2卷 125-130页

作者： Santiago Brugo Olmedo Vanesa Y.Rawe Florencia N.Nodar german D.Galavema Anibal A.Acosta hector E.Chemes Centro de Estudios en Ginecologia y Reproduccion CEGyRBuenos AiresArgentina Laboratory of Testicular Physiology and Pathology Endocrinology DivisionChildren's HospitalBuenos AiresArgentina

Aim:Dysplasia of the fibrous sheath(DFS)is an anomaly found in asthenozoospermic patients with extremely lowor absent *** order to determine the efficacy of ICSI in these patients,a retrospective analysis of ICSI results inDFS patients has been ***:Ten ICSI attempts were performed in 6 patients with diagnosis of Dysplasiaof the Fibrous Sheath studied by transmission and scanning electron ***:In the cases studied,sperm concentration was(29.62±18.05)×10^(6)/mL,total motility was 1.14±1.31%.Progressive motility was 0%except for one case with 0.1%.One hundred and three preovulatory oocytes were obtained and 94 metaphaseⅡoocyteswere ***-nine of them showed two pronuclei(fertilization rate:73.4%).Forty-nine embryos were ob-tained and 34 were transferred(mean:3.4 embryos per transfer).Five pregnancies were diagnosed byβ-hCG plasmalevel determinations that resulted to be one preclinical abortion,one clinical abortion and three ***(ongoing)was achieved from a cryopreserved embryo ***:These results showed thatICSI provides a suitable solution for patients suffering from irreversible sperm defects such as ***,it ismandatory to inform couples of possible transmission risks to offspring,which are unknown at *** when theetiology of this problem is disclosed,it will be possible to assess the real genetic risk.

关键词： spermatozoa dysplasia ciliary motility disorders intracytoplasmic sperm injection

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

Performance assessment of borehole arrangements for the design of rectangular shallow foundation systems

引用

Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3291-3304页

作者： Marcin Chwała Danko J.Jerez hector A.Jensen Michael Beer Wrocław University of Science and Technology Poland Institute for Risk and Reliability Leibniz University HannoverGermany Departamento de Obras Civiles Universidad Técnica Federico Santa MaríaChile International Joint Research Center for Resilient Infrastructure&International Joint Research Center for Engineering Reliability and Stochastic Mechanics Tongji UniversityShanghai200092China Institute for Risk and Uncertainty and School of Engineering University of LiverpoolUnited Kingdom

This study proposes a framework to evaluate the performance of borehole arrangements for the design of rectangular shallow foundation systems under spatially variable soil conditions. Performance measures are introduced to quantify, for a fixed foundation layout and given soil sounding locations, the variability level of the foundation system bearing capacities in terms of their mean values and standard deviations. To estimate these measures, the recently proposed random failure mechanism method (RFMM) has been adopted and extended to consider any arrangement of rectangular foundations and boreholes. Hence, three-dimensional bearing capacity estimation under spatially variable soil can be efficiently performed. Several numerical examples are presented to illustrate the applicability of the proposed framework, including diverse foundation arrangements and different soil correlation structures. Overall, the proposed framework represents a potentially useful tool to support the design of geotechnical site investigation programs, especially in situations where very limited prior knowledge about the soil properties is available.

关键词： Foundations Geotechnical engineering Bearing capacity Optimal borehole placement Soil spatial variability

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

Biodiversity effects and transgressive overyielding

引用

Journal of Plant Ecology 2008年第2期1卷 95-102页

作者： Bernhard Schmid Andy hector Prasenjit Saha Michel Loreau Institute of Environmental Sciences University of ZurichWinterthurerstrasse 190CH-8057 ZurichSwitzerland Physics Institute University of ZurichWinterthurerstrasse 190CH-8057 ZurichSwitzerland Department of Biology McGill University1205 ave Docteur PenfieldMontrealQuebecCanada H3A 1B1

Aims The potential for mixtures of plant species to produce more biomass than every one of their constituent species in monoculture is still controversially discussed in the *** we tested how this socalled transgressive overyielding is affected by variation between and within species in monoculture yields in biodiversity *** We use basic statistical principles to calculate expected maximum monoculture yield in a species pool used for a biodiversity *** a real example we show how between-and withinspecies variance components in monoculture yields can be *** the two components we estimate the importance of sampling bias in transgressive overyielding *** Findings The net biodiversity effect(difference between mixture and average monoculture yield)needed to achieve transgressive overyielding increases with the number of species in a mixture and with the variation between constituent species in monoculture *** there is no significant variation between species,transgressive overyielding should not be calculated using the best monoculture,because in this case the difference between this species and the other species could exclusively reflect a sampling *** sampling bias decreases with increasing variation between *** for transgressive overyielding require replicated species’***,it can be doubted whether such an emphasis on monocultures in biodiversity experiments is justified if an analysis of transgressive overyielding is not the major goal.

关键词： biodiversity experiments mixtures monocultures overyielding analysis sampling bias

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

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

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：