检索结果-南通市图书馆

The effects of climate and land use change on the potential distribution and nesting habitat of the Lesser Adjutant in Nepal

引用

Avian Research 2023年第3期14卷 326-335页

作者： hem bahadur katuwal Hari Prasad Sharma Prashant Rokka Krishna Prasad Bhusal Bishnu Prasad Bhattarai Sabina Koirala Sandeep Chhetri Luitel Shailendra Yadav Ganesh Sah hem Sagar Baral Laxman Prasad Poudyal Lin Wang Rui-Chang Quan Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan666303China Southeast Asia Biodiversity Research Institute Chinese Academy of SciencesYezinNay Pyi Taw05282Myanmar Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation MenglaYunnan666303China Nepal Zoological Society Kathmandu44600Nepal Central Department of Zoology Institute of Science and TechnologyTribhuvan UniversityKathmandu44600Nepal Faculty of Forestry Agriculture and Forestry UniversityHetaudaMakwanpur44107Nepal IUCN SSC Bird Red List Authority Rue Mauverney1196GlandSwitzerland Mithila Wildlife Trust JanakpurdhamDhanusa45600Nepal Zoological Society of London-Nepal Office Kathmandu44600Nepal Institute of Land Water and SocietySchool of Environmental SciencesCharles Sturt UniversityAlbury-WodongaAustralia Shivapuri-Nagarjun National Park Department of National Parks and Wildlife ConservationKathmanduNepal

Climate change and land use change pose a threat to the world’s biodiversity and have significant impacts on the geographic distribution and composition of many bird species,but little is known about how they affect threatened large-sized waterbird species that rely on agricultural *** address this gap,we investigated how climate and land use changes influence the distribution and nesting habitats of the globally vulnerable Lesser Adjutant(Leptoptilos javanicus) in *** 2012 and 2023,we collected distribution data from 24 districts and nesting site information from 18 *** a nation-wide breeding survey conducted in 2020,we documented a total of 581 fledglings from 346 nests in 109 *** ensemble model predicted a current potential distribution of 15%(21,637 km2) and a potential nesting habitat of 13%(19,651 km2) for the species in *** highest predicted current suitable distribution and nesting habitat was in Madhesh Province,while none was predicted in Karnali *** majority of this predicted distributional and nesting habitat falls on agricultural landscapes(>70%).Our model showed a likely range expansion of up to 15%(21,573 km2) for the distribution and up to 12%(17,482 km2) for the nesting habitat under SSP5-8.5 scenarios for the *** range expansion is expected to occur mainly within the current distribution and breeding range(Tarai and some regions of Siwalk),particularly in Lumbini and Sudurpashchim provinces,and extend to the northern portions(Siwalik and Mid-hill regions) in other ***,the current Protected Areas and Important Bird and Biodiversity Areas are inadequate for providing optimal habitats for the *** the model suggests range expansion,the use of such novel habitats is primarily contingent on the availability and protection of large-sized trees(particularly Bombax ceiba,observed in 65% of colonies) in agricultural regions where nesting ***,our research sugges

关键词： Agricultural landscapes Bombax ceiba Ensemble modeling Farmland bird IBA Nest site

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

Influence of loading and heating processes on elastic and geomechanical properties of eclogites and granulites

引用

Journal of Rock Mechanics and Geotechnical Engineering 2018年第1期10卷 127-137页

作者： hem bahadur Motra Sascha Zertani Department of Geosciences Marine and Land Geomechanics and Geotechnics University of Kiel Institut für Geologische Wissenschaften Freie Universitat Berlin

Increased knowledge of the elastic and geomechnical properties of rocks is important for numerous engineering and geoscience applications(e.g. petroleum geoscience, underground waste repositories,geothermal energy, earthquake studies, and hydrocarbon exploration). To assess the effect of pressure and temperature on seismic velocities and their anisotropy, laboratory experiments were conducted on metamorphic rocks. P-(Vp) and S-wave(Vs) velocities were determined on cubic samples of granulites and eclogites with an edge length of 43 mm in a triaxial multianvil apparatus using the ultrasonic pulse emission technique in dependence of changes in pressure and temperature. At successive isotropic pressure states up to 600 MPa and temperatures up to 600 ℃, measurements were performed related to the sample coordinates given by the three principal fabric directions(x, y, z) representing the foliation(xy-plane), the normal to the foliation(z-direction), and the lineation direction(x-direction). Progressive volumetric strain was logged by the discrete piston displacements. Cumulative errors in Vpand Vsare estimated to be <1%. Microcrack closure significantly contributes to the increase in seismic velocities and decrease in anisotropies for pressures up to 200-250 MPa. Characteristic P-wave anisotropies of about 10% are obtained for eclogite and 3-4% in a strongly retrogressed eclogite as well as granulites. The wave velocities were used to calculate the geomechanical properties(e.g. density, Poisson’s ratio, volumetric strain, and elastic moduli) at different pressure and temperature conditions. These results contribute to the reliable estimate of geomechanical properties of rocks.

关键词： Anisotropy Elastic wave velocities Dynamic elastic moduli Geomechanical rock properties Microcrack

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 stress on fracture development in the Asmari reservoir in the Zagros Thrust Belt

引用

Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4491-4503页

作者： Ghasem Aghli Babak Aminshahidy hem bahadur Motra Ardavan Darkhal Farshad Sadeghpour Mehdi Ostadhassan Oil and Gas Research Institute Ferdowsi University of MashhadMashhad91779-48974Iran Institute of Geosciences Marine and Land Geomechanics and GeotectonicsChristian-Albrechts-UniversitatKiel24118Germany School of Mining Engineering College of EngineeringUniversity of TehranTehran14179-35840Iran Department of Petroleum Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of TechnologyAbadan63187-14317Iran

Development and production from fractured reservoirs require extensive knowledge about the reservoir structures and in situ stress *** this,this paper investigates fractures and the parameters(aperture and density)through a combination of wellbore data and geomechanical laboratory testing in three separate wells in the Asmari reservoir,Zagros Belt,*** Asmari reservoir(Oligo-Miocene)consists mainly of calcitic and dolomitic rocks in depths of 2000e3000 *** on the observation of features in several wellbores,the orientation and magnitude of the in situ stresses along with their influence on reservoir-scale geological structures and neotectonics were *** study identifies two regional tectonic fracture settings in the reservoir:one set associated with longitudinal and diagonal wrinkling,and the other related to *** former,which is mainly of open fractures with a large aperture,is dominant and generally oriented in the N45°-90°W direction while the latter is obliquely oriented relative to the bedding and characterized by N45°-90°*** largest aperture is found in open fractures that are longitudinal and developed in the dolomitic zones within a complex stress ***,analysis of drilling-induced fractures(DIFs)and borehole breakouts(BBs)from the image logs revealed that the maximum horizontal stress(SHmax)orientation in these three wells is consistent with the NE-SW regional trend of the SHmax(maximum principal horizontal stress)in the Zagros ***,the stress magnitude obtained from geomechanical testing and poroelastic equations confirmed a variation in stress regime from normal to reverse,which changes in regard to active faults in the study ***,a relationship between the development degree of open fractures and in situ stress regime was *** means that in areas where the stress regime is complex and reverse,fractures would exhibit higher density,dip angle,and larger apertures.

关键词： Fractures Image logs In situ stress Structural analysis Poroelastic equations

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

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

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：