检索结果-南通市图书馆

integrating small mammal community variables into aircraft–wildlife collision management plans at Namibian airports

在线全文

学校读者我要写书评

暂无评论

integrative Zoology 2015年第6期10卷 515-530页

作者： Morgan L.HAUPTFLEiSCH nico L.AVenANT Department of Agriculture and Natural Resources Sciences Polytechnic of NamibiaWindhoekNamibia Department of Mammalogy National Museumand Centre for Environmental ManagementUniversity of the Free StateBloemfonteinSouth Africa

Understanding ecosystems within and around airports can help to determine the causes and possible mitigation measures for collisions between aircraft and *** mammal communities are an important component of the semi-arid savanna ecosystems of Namibia,its productivity and its ecosystem *** are also a major direct attractant for raptors at *** present study compared the abundance and diversity of small mammals between Namibia’s 2 main airport properties(Hosea Kutako international Airport and Eros Airport),and among areas of land used for various purposes surrounding the airports.A total of 2150 small mammals(3 orders,11 species)were captured over 4 trapping *** mammal abundance was significantly higher at the end of the growing season than during the non-growing *** grass mowing regimen in current management plans at the airports resulted in a significant reduction of small mammal abundance at Hosea Kutako during the non-growing season only,thus indicating that annual mowing is effective but insufficient to reduce the overall abundance of mammal prey species for *** mammal numbers were significantly higher at Hosea Kutako Airport compared to the cattle and game farming land surrounding the airport,while no differences in small mammal densities or diversity were found for areas with different land uses at and surrounding *** study suggests that the fence around Hosea Kutako provides a refuge for small mammals,resulting in higher *** also indicates that different surrounding land use practices result in altered ecosystem function and productivity,an important consideration when identifying wildlife attractants at airports.

关键词： airport ecosystems bird strike risk Namibia small mammal indicators

Physiological strategies of moult-migrating Black-necked Grebes(Podiceps nigricollis)in a polluted staging site according to blood chemistry

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2023年第3期14卷 453-459页

作者： Juan A.Amat nico Varo Marta i.Sanchez Andy J.Green Damaso Hornero-Mendez Juan Garrido-Fernandez Cristina Ramo Departamento de Ecología y Evolucion Estacion Biologica de Donana(EBD-CSIC)41092SevillaSpain independent researcher 41010SevillaSpain Departamento de Biología de la Conservacion y Cambio Global Estacion Biologica de Donana(EBD-CSIC)41092SevillaSpain Departamento de Fitoquímica de Alimentos Instituto de la Grasa(IG-CSIC)41013SevillaSpain

After breeding,Black-necked Grebes(Podiceps nigricollis)perform a moult-migration to autumn hypersaline staging sites,where they moult the flight feathers and forage on superabundant brine shrimp(Artemia spp.)before leaving for wintering *** the stay in moulting sites,the grebes experience changes in organs and muscle size(atrophy,hypertrophy),and almost double their body mass,which has been suggested to act as an insurance against a collapse in prey availability in late *** two years we collected blood samples from hundreds of individuals at one of the most important European moulting sites(the Odiel marshes,SW Spain),which is a highly polluted area due to mining drainage and chemical *** assessed the potential effect of moulting stage,day of the year and body condition on 16 blood biochemical *** of the changes in prey availability and body composition of grebes,we expected some physiological adjustments during *** levels of cholesterol suggested that birds in active moult increased foraging effort to face the costs of *** was increased amount of lactate dehydrogenase,corresponding to periods of breast muscle *** in active moult augmented protein ingestion,likely to account for the requirements of feather *** also show that the probability of fasting due to low prey availability increased late in the moulting season,as demonstrated by an increase in plasmaβ-hydroxy-butyrate.

关键词： Blood biochemistry Eared grebe Fasting Feather replacement Odiel marshes Waterbird

Gossypibomas as a rare cause of common bile duct dilation

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases international 2019年第5期18卷 498-500页

作者： Raffaele Pezzilli Paula A.Mauloni nico Pagano Department of Gastroenterology Sant’Orsola Hospital

Gossypibomas are any foreign bodies left inside the patient after an operation. it represents a diagnostic challenge in clinical practice because the clinical consequence may manifest in different forms immediately, m... 详细信息

关键词： Gossypibomas common bile duct dilation clinical consequence

China’s New Rural income Support Policy:impacts on Grain Production and Rural income inequality

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2006年第6期14卷 58-69页

作者： nico Heerink Marijke Kuiper Research Fellow International Food Policy Research Institute (IFPRI). Email: n.heerink(g)*** Researcher Agricultural-Economics Research Institute The Hague Netherlands. Email: marijke.kuiper(g)wur.nl Associate Professor College of Land Management Nanjing Agricultural University Nanjing China. Email: serena2(g)***

This paper analyses the impact of agricultural tax abolition and direct income payments to grain farmers on grain production and rural inequality in China. To separate the impact of the income support measures from recent price trends for grains and inputs, and to account for differences in household responses, we use a village-level general equilibrium model that we calibrate for two villages with different degrees of market access in Jiangxi province. The results show that the income support policy does not reach its goal of promoting grain production. The increased incomes allow farm households to buy more inputs for livestock production and involve other activities that are more profitable than grain farming. Selling of rice outside the villages declines more than rice production, because households in the villages consume more rice when incomes rise. We further find that the income support measures tend to reduce income within a village, but that tax abolition tends to widen income inequality between villages.

关键词： agricultural policy China grain production household income inequality

Combining thermodynamics with tensor completion techniques to enable multicomponent microstructure prediction

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 1643-1653页

作者： Yuri Amorim Coutinho nico Vervliet Lieven De Lathauwer Nele Moelans Department of Materials engineering(MTM) KU LeuvenB-3001 LeuvenBelgium Department of Electrical engineering(ESAT) KU LeuvenB-3001 LeuvenBelgium Group Science Engineering and TechnologyKU Leuven KulakB-8500 KortrijkBelgium

Multicomponent alloys show intricate microstructure evolution,providing materials engineers with a nearly inexhaustible variety of solutions to enhance material *** microstructure evolution simulations are indispensable to exploit these *** simulations,however,require the handling of high-dimensional and prohibitively large data sets of thermodynamic quantities,of which the size grows exponentially with the number of elements in the alloy,making it virtually impossible to handle the effects of four or more *** this paper,we introduce the use of tensor completion for highdimensional data sets in materials science as a general and elegant solution to this *** show that we can obtain an accurate representation of the composition dependence of high-dimensional thermodynamic quantities,and that the decomposed tensor representation can be evaluated very efficiently in microstructure *** realization enables true multicomponent thermodynamic and microstructure modeling for alloy design.

关键词： microstructure alloy enable

Carnivore stable carbon isotope niches reflect predator–prey size relationships in African savannas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

integrative Zoology 2018年第2期13卷 166-179页

作者： Jacqueline CODRON nico L AVenANT Corli WiGLEY-COETSEE Daryl CODRON Mammalogy Department National MuseumBloemfonteinSouth Africa Florisbad Quaternary Research Department National MuseumBloemfonteinSouth Africa Centre for environmental Management University of the Free StateBloemfonteinSouth Africa Scientific Services SANParksSkukuzaSouth Africa School of Natural Resource Management Nelson Mandela UniversityGeorge CampusSouth Africa institute for Geosciences Palaeontology/Sclerochronology Research GroupJohannes Gütenberg UniversityMainzGermany

Predator-prey size relationships are among the most important patterns underlying the structure and function of ecological ***,these relationships have already been shown to be important for understanding patterns of macroevolution and differential extinction in the terrestrial vertebrate fossil *** isotope analysis(SiA)is a powerful remote approach to examining animal diets and *** approach is based on the principle that isotope compositions of consumer tissues reflect those of their *** systems where resource isotope compositions are distributed along a body size gradient,SiA could be used to reconstruct predator-prey size *** analyzed stable carbon isotope distributions amongst mammalian herbivores in extant and Plio-Pleistocene African savanna assemblages,and show that the range ofδ^(13)C values among mammalian prey species(herbivores and rodents)increases with body mass(BM),because C_(4) plant feeding(essentially grazing)is more common among larger ***,δ^(13)C values of mammalian carnivores in these systems are related to species’BM,reflecting a higher average C_(4) prey component in the diets of larger-bodied *** pattern likely emerges because only the largest carnivores in these systems have regular access to the C_(4) prey base,whereas smaller carnivores do ***δ^(13)C-BM relationship observed in mammalian carnivores is a potentially powerful approach for reconstructing and parameterizing predator-prey size relationships in contemporary and fossil savanna assemblages,and for interpreting how various behavioral,ecological and environmental factors influence prey size selection.

关键词： body mass carbonate collagen hair pleistocene

Laser-induced microstructures on silicon for laser-driven acceleration experiments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and engineering 2017年第2期5卷 57-62页

作者： Tina Ebert nico W.Neumann Torsten Abel Gabriel Schaumann Markus Roth Department of Nuclear Physics TU Darmstadt Germany

Ultrashort laser pulses are used to create surface structures on thin(25 μm) silicon(Si) wafers. Scanning the wafer with a galvanometric mirror system creates large homogeneously structured areas. The variety of structure shapes that can be generated with this method is exemplified by the analysis of shape, height and distance of structures created in the ambient media air and isopropanol. A study of the correlation between structure height and remaining wafer thickness is presented. The comparatively easy manufacturing technique and the structure variety that allows for custom-tailored targets show great potential for high repetition rate ion acceleration experiments.

关键词： microstructured targets black silicon ion acceleration

Surface area-volume ratios in insects

在线全文

学校读者我要写书评

暂无评论

insect Science 2017年第5期24卷 829-841页

作者： Sara Kuhsel Adrian Bruckner Sebastian Schmelzle Michael Heethoff nico Bluthgen Department of Biology Technische Universitat Darmstadt Schnittspahnstrasse 3 D-64287 Darmstadt Germany

Body mass, volume and surface area are important for many aspects of the physiology and performance of species. Whereas body mass scaling received a lot of attention in the literature, surface areas of animals have not been measured explicitly in this context. We quantified surface area-volume （SA/V） ratios for the first time using 3D surface models based on a structured light scanning method for 126 species of pollinating insects from 4 orders （Diptera, Hymenoptera, Lepidoptera, and Coleoptera）. Water loss of 67 species was measured gravimetrically at very dry conditions for 2 h at 15 and 30 ℃ to demonstrate the applicability of the new 3D surface measurements and relevance for predicting the performance of insects. Quantified SA/V ratios significantly explained the variation in water loss across species, both directly or after accounting for isometric scaling （residuals of the SA/V - mass2/3 relationship）. Small insects with a proportionally larger surface area had the highest water loss rates. Surface scans of insects to quantify allometric SA/Vratios thus provide a promising method to predict physiological responses, improving the potential of body mass isometry alone that assume geometric similarity.

关键词： body size body shape 3D surface imaging sphericity structured light water loss

Numerical Study on the Mixed Model in the GOCE Polar Gap Problem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial information Science 2011年第3期14卷 216-222页

作者： ZOU Xiancai CAi Jianqing nico Sneeuw Li Jiancheng institute of Geodesy University of Stuttgart Geschwister-Scholl-Str. 24D D-70174 Stuttgart Germany School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China

Gravity gradients acquired by the Gravity field and steady-state Ocean Circulation Explorer(GOCE) do not cover the entire earth because of its sun-synchronous orbit leaving data gaps with a radius of about 6.5° in the polar *** studies showed that the loss of data in the polar regions deteriorates the accuracy of the low order(or near zonal) coefficients of the earth gravity model,which is the so-called polar gap problem in *** order to find a stable solution for the earth gravity model from the GOCE gravity gradients,three models,*** Gauss-Markov model,light constraint model and the mixed model,are compared and evaluated numerically with the gravity gradient simulated with the *** comparison shows that the Best Linear Uniformly Unbiased Estimation(BLUUE) estimator of the mixed model can solve the polar gap problem as effectively as the light constraint model;furthermore,the mixed model is more rigorous in dealing with the supplementary information and leads to a better accuracy in determining the global geoid.

关键词： Earth gravity model satellite gravity GOCE mixed model polar gap problem