检索结果-南通市图书馆

Global concerns related to water biology and security:The need for language and policies that safeguard living resources versus those that dilute scientific knowledge

引用

Water Biology and Security 2023年第4期2卷 136-146页

作者： robert M.Hughes James r.Karr robert L.Vadas Dominick A.DellaSala Marcos Callisto Maria Joao Feio Teresa Ferreira Neels Kleynhans renata ruaro Chris O.Yoder J.hal Michael Amnis Opes Institute 2895 SE GlennCorvallisOR97333USA Department of Fisheries Wildlife&Conservation SciencesOregon State UniversityCorvallisOR97331USA School of Aquatic and Fishery Sciences University of WashingtonSeattleWA98915USA Karr Consulting 102 Galaxy View CourtSequimWA98382USA 2909 Boulevard rd.SE OlympiaWA98501-3971USA Wild Heritage a Project of Earth Island Institute2150 Allston WayBerkeleyCA94704-1346USA Departamento de Genetica Ecologia e EvolucaoInstituto de Ciencias BiologicasUniversidade Federal de Minas GeraisAvenida Antonio Carlos 6627CEP 31270-901Belo HorizonteMGBrazil Associate Laboratory ArNET Marine and Environmental Sciences CentreDepartment of Life SciencesUniversity of CoimbraCoimbraPortugal Forest research Centre&Associate Laboratory TErrA University of LisbonTapada da Ajuda1349-017LisbonPortugal Department of Water Affairs and Forestry(retired) 8th Avenue 771Wonderboom South0084PretoriaSouth Africa Graduate Program in Environmental Science and Technology Federal Technological University of Parana81280-340CuritibaPRBrazil Midwest Biodiversity Institute 4673 Northwest ParkwayHilliardOH43026USA Ecologists Without Borders OlympiaWAUSA

Increasingly,scientists and non-scientists,especially employees of government agencies,tend to use weak or equivocal language when making statements related to science policy and governmental *** use recent publications to provide examples of vague language versus examples of strong language when authors write about regulating anthropogenic pressures on natural *** language is common in agency reports,policy documents,and even scientific papers published by *** language limits success in regulating anthropogenic pressures on natural *** challenge must be recognized and countered as a driver of the condition of water and associated *** also list sources of vague wording,provide global examples of how ambiguous language and political influences have contributed to water resource degradation,discuss the recent history of science censorship,and offer possible solutions for more direct scientific *** found that:(1)equivocal language was especially common in concluding statements and not only by government employees;(2)authors discussed confusing language concerns in an agency publication;and(3)agency employees sometimes used active,strong *** drivers of weak language include:(1)holding on to old paradigms and resisting new knowledge;(2)scientific uncertainty;(3)institutional manuscript review policies;(4)employment and funding insecurity;and(5)avoiding the appearance of *** associated with euphemistic language included climate change,flow and physical habitat alteration,dams,agriculture,mining,forestry,and fisheries,as well as resistance towards monitoring,assessing,and reporting ecological *** for mitigating equivocal language involve employment protections and greater focus on scientific *** conclude that natural resource scientists should resist calls to employ imprecise ***,they should be strong advocates for prescriptive and protective natura

关键词： Corruption Ethics Science censoring Science policy Water resource degradation

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

DETErMINATION OF VLF PATHS IN 3D FIELD-ALIGNED DUCTS

DETERMINATION OF VLF PATHS IN 3D FIELD-ALIGNED DUCTS

引用

1997 International Symposium on radio Propagation(ISrP’97)

作者： hal J.Strangeways Department of Electronic and Electrical Engineering University of Leeds

＜正＞Ducted VLF waves can interact via cyclotron resonance with counterstreaming electrons in or near the equatorial plane resulting in particle precipitation giving localised electron density enhancements in the D-region（LIEs） which then cause phase and amplitude perturbations on subionosphere VLF propagation（Trimpi effect）. Satellite observations have been made of precipitating electrons associated with ducted whistlers and the extent of the precipitation region at the satellite altitude in the lower ionosphere has been estimated by the length of satellite orbit for which the precipitation events were *** size of precipitation regions has also been estimated by monitoring perturbations of two or more VLF transmitters for sub-ionosphere propagation using a network of receiving *** is found, however,that the dimensions of both typical LIE enhancements and the extent of precipitation regions in the lower ionosphere appear to be larger than might be expected from observations of ducted whistlers both on the ground and in situ aboard *** investigate this,the paths of VLF signals in ducts（geomagnetic field aligned enhancements of electron density） are determined using a 3D magnetospheric ray-tracing model including 3D *** calculations show that the ray path excursions are reduced in bothΔL andΔΦ（longitude） as the rays propagate upwards in the duct from low altitude（～1000 km） to the equatorial *** implies that precipitation regions and LIEs would typically have smaller dimensions in L-value that low altitude whistler duct widths measured by the spatial extent of the whistler-mode ***,this appears to be contrary to general *** account for this discrepancy,ray paths are also determined for ducts which widen between low altitude and the equatorial *** show that a better fit with experimental observations is obtained but the calculations can still not easily explain significantly wider ducts in L-value in the

关键词：

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

诊断性使用131I后诱发甲状腺癌的危险

引用

国际放射医学核医学杂志 1996年第6期20卷 44-45页

作者：ＨａｌＰ

诊断性使用１３１Ｉ后诱发甲状腺癌的危险［英］／ＨａｌＰ…∥ＲａｄｉａｔＲｅｓ．－１９９６，１４５（１）．－８６～９２方法：１９５０～１９６９年间１３１Ｉ检查的３４１０４例病人，８０％为女性，２０％为男性。第一次受检时... 详细信息

诊断性使用１３１Ｉ后诱发甲状腺癌的危险［英］／ＨａｌＰ…∥ＲａｄｉａｔＲｅｓ．－１９９６，１４５（１）．－８６～９２方法：１９５０～１９６９年间１３１Ｉ检查的３４１０４例病人，８０％为女性，２０％为男性。第一次受检时平均年龄４３岁（１～７５岁），平均...

关键词：甲状腺癌女性病人诊断性受检者

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

Spatio-Temporal Study of Toxic and Harmful Planktonic Taxa at Two Oceanic Sites Mehdia and Moulay Bousselham, rabat Sale Kenitra region, Morocco, between 2017 and 2018

引用

Open Journal of Marine Science 2020年第2期10卷 41-51页

作者： A. hal Aberrhaman B. Bouhaddioui L. A. Lrhorfi r. Bengueddour Biology Department Laboratory Biochemistry Biotechnology Health and Environment Faculty of Science Ibn Tofail University Kenitra Morocco

Phytoplankton is all cyanobacteria and microalgae (microscopic plants) present in surface water that may be carried by water currents. The study was conducted at two oceanic sites Mehdia and Moulay Bousselham, rabat sale Kenitra region, Morocco, between 2017 and 2018. The objective of this study is to compare the spatiotemporal evolution of certain toxic planktonic species between the two sites. The planktonic species identified all have toxic potency but to varying degrees such as Alexandrium, Dinophysis, Gymnodinum, Pseudonitzschia and Proocentrum. The comparison of the abundance of these taxa in the two sites confirms that the Moulay Bousselham site is characterized by the presence of the most toxic planktonic species represented mainly by Pseudonitzschia in contrast the Mehdia site experienced an abundance of the Proocentrum kind. This situation requires a more detailed study of the essential causes of the proliferation of these species.

关键词： Phytoplankton Surface Water Toxic Power Spatiotemporal Evolution Mehdia Moulay Bousselham

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

碌碌人间景,闲在神仙境

引用

英语学习 2000年第11期 10-13页

作者： hal Niedzviecki 侯毅凌

For several years now,Ihave relied on stuPid jobsto Pay my way through theworld.]This isn't beeauselam a stuPid *** the eontrary,stuPid jobs are a way to avoid thebrain一nunlbing idioey of full一timeemPloyment.2 They are the next bestthing to having no job at all.,Theywill keeP you sane一and sm叭. Understanding the stuPid job 15the key t

关键词：农夫仙境 work

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

Applying Downscaled Global Climate Model Data to a Groundwater Model of the Suwannee river Basin, Florida, USA

引用

American Journal of Climate Change 2016年第4期5卷 526-557页

作者： Eric Swain J. hal Davis Caribbean-Florida Water Science Center U.S. Geological Survey Davie FL USA retired US Geological Survey Davie FL USA

The application of Global Climate Model (GCM) output to a hydrologic model allows for comparisons between simulated recent and future conditions and provides insight into the dynamics of hydrology as it may be affected by climate change. A previously developed numerical model of the Suwannee river Basin, Florida, USA, was modified and calibrated to represent transient conditions. A simulation of recent conditions was developed for the 372-month period 1970-2000 and was compared with a simulation of future conditions for a similar-length period 2039-2069, which uses downscaled GCM data. The MODFLOW groundwater-simulation code was used in both of these simulations, and two different MODFLOW boundary condition “packages” (river and Streamflow-routing Packages) were used to represent interactions between surface-water and groundwater features. The hydrologic fluxes between the atmosphere and landscape for the simulation of future conditions were developed from dynamically downscaled precipitation and evapotranspiration (ET) data generated by the Community Climate System Model (CCSM). The downscaled precipitation data were interpolated for the Suwannee river model grid, and the downscaled ET data were used to develop potential ET and were interpolated to the grid. The future period has higher simulated rainfall (10.8 percent) and ET (4.5 percent) than the recent period. The higher future rainfall causes simulated groundwater levels to rise in areas where they are deep and have little ET in either the recent or future case. However, in areas where groundwater levels were originally near the surface, the greater future ET causes groundwater levels to become lower despite the higher projected rainfall. The general implication is that unsaturated zone depth could be more spatially uniform in the future and vegetation that requires a range of conditions (substantially wetter or drier than average) could be detrimentally affected. This vegetation would include wetland species,

关键词： Groundwater Climate Model river System Downscaling

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

基于切削电流指数新异检测的长壁采煤机监测方法研究

引用

湖南科技大学学报（自然科学版） 2006年第2期21卷 55-58页

作者：秦国军胡茑庆官志强 hal Gurgenci 国防科技大学机电工程与自动化学院湖南长沙410073 澳大利亚昆士兰大学采矿联合研究中心

在定义采煤机切削电流指数的基础上,采用统计分析和支持向量机方法,对采煤机健康状态进行了新异故障检测方法的研究,通过大量正常数据,构建和训练了新异类检测器.通过对澳大利亚某煤矿1号采煤机的实测数据应用表明,该检测器可有效检测... 详细信息

在定义采煤机切削电流指数的基础上,采用统计分析和支持向量机方法,对采煤机健康状态进行了新异故障检测方法的研究,通过大量正常数据,构建和训练了新异类检测器.通过对澳大利亚某煤矿1号采煤机的实测数据应用表明,该检测器可有效检测意外发生的未知故障.图7,表3,参8.

关键词：长壁采煤机切削电流指数新异类检测统计分析支持向量机

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

Study of the Effect of Certain Physicochemical Parameters on the Distribution of Toxic Planktonic Taxa in Two Oceanic Sites Mehdia and Moulay Bousselham, rabat Sale Kenitra region, Morocco

引用

Open Journal of Marine Science 2020年第1期10卷 32-39页

作者： A. hal Aberrhaman L. A. Lrhorfi B. Bouhaddioui r. Bengueddour Biology Department Laboratory Biochemistry Biotechnology Health and Environment Faculty of ScienceIbn Tofail University Kenitra Morocco

The diversity of phytoplankton communities in marine waters depends on the environmental, physical, chemical and biological factors in which they occur. The aim of our work is to determine the effect of certain physicochemical parameters on the proliferation of five planktonic taxa (1: Alexandrium 2: Dinophysis 3: Gymnodinum;4: Pseudonitzschia;5: Proocentrum) identified on the sites of Mehdia and Moulay Bousselham, Gharb of Moroccobetween 2017 and 2018. The results confirm the presence of these toxic taxa in both sites but with different densities. The ACP has allowed separating two distinct groups with coefficients of determination of more than 70%. Indeed, the first group concerning the site of Mehdia, it is characterized by an abundance of the taxa of Gymnodium and Pseudoni, which prefers salt water and oxygenated, thus important phosphate and nitrate levels. Moreover, unlike the temperature factor. However, the second group concerning the Moulay Bousselham site is located on the positive side of the axis, essentially characterized by moderately high temperatures. These conditions are favorable for the Dinophysis, Alexandrum and Proocentrum taxa. This trend makes it possible to classify the Moulay Bousselham site as a risk zone. In light of these results, the authorities of all stakeholders in the sector must increase efforts to overcome this constraint.

关键词： Diversity Plankton Physicochemical Parameters ACP risk Mehdia and Moulay Bousselham

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

火花源光发射光谱法分析中测量不确定度的表述及原材料规格一致性概率的计算

引用

冶金分析 2012年第1期32卷 19-22页

作者： Edmund halász J-M Bhlen 赛默飞世尔科技有限公司

根据ISO 17025,每年有越来越多的实验室开始使用光发射光谱仪(OES)。ISO17025的遵守提升了评估和报道测量不确定度的重要性。《测量不确定度表示指南》(GUM)提供了不确定度分析的指导方法。不过,这些指导方针的实施是一项艰巨的任务,尤... 详细信息

根据ISO 17025,每年有越来越多的实验室开始使用光发射光谱仪(OES)。ISO17025的遵守提升了评估和报道测量不确定度的重要性。《测量不确定度表示指南》(GUM)提供了不确定度分析的指导方法。不过,这些指导方针的实施是一项艰巨的任务,尤其是不熟悉必要的数学和统计学概念时。因此,试验和校准人员必须经常寻找现成的工具以满足分析需求。本文报道了赛默飞世尔科技有限公司实施的分析软件,用于测量不确定度的计算。此外,还描述了基于不确定度知识的应用,以用于计算产品一致性的概率。

关键词：火花源光发射光谱测量不确定度置信区间一致性测试风险分析

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

地铁区间渡线大断面段浅埋暗挖技术研究

引用

铁道工程学报 2018年第6期35卷 93-99页

作者：吴海艳中国铁路设计集团有限公司天津300142

研究目的:地铁区间设置停车折返线、渡线等段处大跨、复杂洞群、变断面的浅埋暗挖隧道施工设计难度大、施工风险高,如何通过优化设计确保结构安全、方便组织施工、降低施工风险成为类似工程设计的难点及重点。本文结合北京地铁3号线区... 详细信息

研究目的:地铁区间设置停车折返线、渡线等段处大跨、复杂洞群、变断面的浅埋暗挖隧道施工设计难度大、施工风险高,如何通过优化设计确保结构安全、方便组织施工、降低施工风险成为类似工程设计的难点及重点。本文结合北京地铁3号线区间渡线大断面隧道浅埋暗挖工程设计中采取的关键技术和具体的工程措施,解决上述设计中的重点问题,以期为区间渡线段等类似工程设计提供借鉴与参考。研究结论:(1)通过研究比选横通道的位置、大断面的数量、总体施工筹划、施工工期及难度等,提出了最佳的区间渡线大断面隧道浅埋暗挖总体方案;(2)通过优化施工横通道设计,提出了带中隔壁的正洞段横通道,减小了正洞通道两侧大面积开马头门的相互影响,实现了开马头门施工期间受力体系的简单安全转换;(3)通过洞门超前加固,设置加强梁、钢支撑及加强格栅等加强措施,确保了开马头门的安全;(4)施工带中隔壁的正洞段横通道进区间正线,结构受力转换安全、施工工序简单,通过制定合理的马头门施工方案及合理规划施工步序等,可确保结构安全可靠,可供同类工程参考或借鉴。

关键词：大断面隧道浅埋暗挖横通道

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

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：