检索结果-南通市图书馆

以WO_3-Al-C混合物为原料采用简易微波辅助法制备WC-Al_2O_3复合粉末（英文）

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous m.tals Society of China 2017年第12期27卷 2630-2637页

作者： A. KARIm.ADEH BEHNAm. m. SAKAKI m. Sh. BAFGHI K. YANAGISAWA School of m.tallurgy and m.terials Engineering Iran University of Science and TechnologyNarmak Tehran 16846-13114 Iran Departm.nt of m.terials Engineering Faculty of Engineering Malayer University Malayer 65719-95863 Iran Research Laboratory of Hydrotherm.l Chem.stry Kochi University Kochi 780-8520 Japan

提出一种操作简单、成本低廉的制备WC-Al_2O_3复合粉末的方法。热力学计算表明,WO_3:xAl:(4-1.5x)C混合体系中WO_3在铝热还原反应过程放出大量的热量,促进了此体系中的碳热还原反应(吸热反应)。用碳原子部分取代铝原子阻止了副产物W_2C... 详细信息

提出一种操作简单、成本低廉的制备WC-Al_2O_3复合粉末的方法。热力学计算表明,WO_3:xAl:(4-1.5x)C混合体系中WO_3在铝热还原反应过程放出大量的热量,促进了此体系中的碳热还原反应(吸热反应)。用碳原子部分取代铝原子阻止了副产物W_2C的形成,这是由于它在较低温度下具有较低的热力学稳定性。为验证本文作者所提出的反应机理,在微波炉中对不同WO_3:xAl:(4-1.5x)C(1.1≤x≤2)混合物进行热处理。结果表明,当1.4≤x≤2时,反应类型为自蔓延高温合成反应,WO_3:xAl:(4-1.5x)C混合体系中少量Al导致大量WC的产生;当混合体系中x=1.4 m.l时,体系经过自蔓延高温合成反应后,在密封环境下连续进行微波加热能获得不含W_2C的WC-Al_2O_3复合物;当x≤1.3时,由于反应不完全以及剩余的反应物,上述反应变得缓慢。

关键词：微波加热燃烧合成 WC-Al2O3复合物

Intragroup social dynam.cs vary with the presence of neighbors in a cooperatively breeding fish

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2019年第1期65卷 21-31页

作者： Jennifer K. Hellm.nn Ian m. Ham.lton Departm.nt of Evolution Ecology and Organismal Biology The Ohio State University Columbus OH 43210 USA Departm.nt of m.them.tics The Ohio State University Columbus OH 43210 USA Jennifer K. Hellm.nn Department of Animal Biology School of Integrative Biology University of Illinois Urbana-Champaign 505 S Goodwin Ave Urbana IL 61801 USA

Conflict is an in here nt part of social life in group-living species. Group m.m.ers m.y m.diate conflict through subm.ssive and affiliative behaviors, which can reduce aggression, stabilize dom.nance hierarchies, and foster group cohesion. The frequency and resolution of within-group conflict m.y vary with the presenee of neighboring groups. Neighbors can threaten the territory or resources of the whole group, prom.ting behaviors that foster within-group cohesion. However, neighbors m.y also foster conflict of interests am.ng group m.m.ers: opportunities for subordinate dispersal m.y alter conflict am.ng dom.nants and subordinates while opportunities for extrapair reproduction m.y increase conflict between m.tes. To understand how neighbors m.diate within-group conflict in the cooperatively breeding fish Neolam.rologus pulcher, we m.asured behavioral dynam.cs and social network structure in isolated groups, groups recently exposed to neighbors, and groups with established neighbors. Aggression and subm.ssion between the dom.nant m.le and fem.le pair were high in isolated groups, but dom.nant aggression was directly prim.rily at subordinates when groups had neighbors. This suggests that neighbors attenuate conflict between m.tes and foster conflict between dom.nants and subordinates. Further, aggression and subm.ssion between sim.larly sized group m.m.ers were m.st frequent when groups had neighbors, suggesting that neighbors induce rank-related conflict. We found relatively little change in within-group affiliative networks across treatm.nts, suggesting that the presence of neighbors does not alter behaviors associated with prom.ting group cohesion. Collectively, these results provide som. of the first em.irical insights into the extent to which intragroup behavioral networks are m.diated by intergroup interactions and the broader social context.

关键词： affiliation colony conflict exponential random graph m.del Neolam.rologus pulcher network

Relativistic particle scattering states with tensor potential and spatially-dependent m.ss

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2013年第5期37卷 14-21页

作者： m. Eshghi m. R. Abdi Departm.nt of Physics Faculty of Science Imam Hossein Comprehensive University Departm.nt of Physics Faculty of Science University of Isfahan

We investigate the relativistic equation for particles with spin 1/2 in the q-param.ter m.dified P5schl- Teller potential, including Coulom.-like tensor interaction with spatially-dependent m.ss for the D-dim.nsion. We present approxim.te solutions of the Dirac equation with these potentials for any spin-orbit quantum.num.er k under spin sym.etry. The norm.lized wave functions are expressed in term. of the hyper-geom.tric series of the scattering states on the k/2π scale. We also give the form.la for the phase shifts, and use the Nikiforov-Uvarov m.thod to obtain the energy eigen-values equation.

关键词： Dirac equation relativistic scattering states m.dified PSschl-Teller potential spin sym.etry tensor interaction

Oviposition preference and larval perform.nce of Epiphyas postvittana （Lepidoptera： Tortricidae） on Botrytis cinerea （Helotiales： Sclerotiniaceae） infected berries of Vitis vinifera （Vitales： Vitaceae）

在线全文

学校读者我要写书评

暂无评论

Insect Science 2016年第2期23卷 313-325页

作者： Syed Z. m. Rizvi Anantanarayanan Ram.n Warwick m. Wheatley Geoffrey Cook School of Agricultural & Wine Sciences Graham.Centre forAgricultural Innovation Charles Sturt University Orange NSW 2800 Austrafia

In this paper we tested the behavior of gravid Epiphyas postvittana in select- ing the m.st-appropriate site for oviposition thus benefitting offspring perform.nce. Our hypothesis was built on Jaenike＇s preference-perform.nce hypothesis （also referred to as the ＂m.ther-knows-the-best＂ hypothesis）. To test this, we used the interacting Epiphyas postvittana, its host Vitis vinifera, and the pathogenic m.crobe Botrytis cinerea system. Populations ofE. postvittana and B. cinerea often exist concurrently on 14. vinifera in Aus- tralasia and their interaction and m.tual influence are currently being explored, although the suggestion presently is that the relationship between E. postvittana and B. cinerea is m.tualistic. We tested the effect of volatiles from.B. cinerea-infected berries and unin- fected （control） berries of V. vinifera on the oviposition behavior of E. postvittana. We also characterized the effects of B. cinerea infection on the berries of V. vinifera on the growth and developm.nt of E. postvittana. Contrary to the preference-perform.nce hy- pothesis, oviposition choices m.de by gravid E. postvittana did not result in the best offspring survival, developm.nt, and perform.nce. The preference for oviposition by E. postvittana was strongly influenced by the olfactory and tactile cues. She laid fewer eggs on B. cinerea-infected berries com.ared to uninfected berries of V. vinifera. The larvae of E. postvittana showed no preference to uninfected berries of V. vinifera. The larvae fed on B. cinerea-infected berries of V. vinifera showing greater survival rate, shorter tim. to pupation, greater pupal m.ss, and on becom.ng adults they laid m.re num.ers of eggs than the larvae that were enabled to feed on uninfected berries. The larvae of E. postvittana transport the conidia of B. cinerea and transm.t grey-m.uld disease to uninfected berries of V. vinifera.

关键词： larval developm.nt life-history perform.nce light-brown apple m.th ovipo-sition preference preference-perform.nce hypothesis grapevine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

人类精浆中明胶结合蛋白的分子多样性

Asian Journal of Andrology 2010年第3期12卷 363-375,I0010页

作者： m.ja m. Kosanovic m.roslava m. Jankovic Departm.nt for Im.unochem.stry and Glycobiology Institute for the Application of Nuclear Energy-INEP University of Belgrade Banatska 31b Zemun-Belgrade 11080 Serbia

研究人类精浆中各种蛋白质的分子特征是了解这些蛋白质的生理和病理功能的必要步骤。据预测，人类精浆中的明胶结合蛋白（由纤维粘连蛋白[FN]和其相关分子组成）对男性不育十分重要，所以本文研究了该蛋白的免疫糖生化特征。将精液参数... 详细信息

研究人类精浆中各种蛋白质的分子特征是了解这些蛋白质的生理和病理功能的必要步骤。据预测，人类精浆中的明胶结合蛋白（由纤维粘连蛋白[FN]和其相关分子组成）对男性不育十分重要，所以本文研究了该蛋白的免疫糖生化特征。将精液参数正常的研究对象的精浆在明胶琼脂糖凝胶上分离，用SDS-PAGE和免疫印迹（不同FN的抗体）分析。用蛋白质芯片技术结合表面增强激光解吸电离飞行时间质谱（SELDI—TOF—m.）技术（亲水性、疏水性和金属亲和芯片）来鉴定分离到的分子的多样性。用甘露醇、海藻糖和硅铝酸特异的植物血凝素和半乳糖凝集素-1检测碳水化合物组成。结果表明分离到的蛋白质组成与已知的FN一致，免疫反应试验也验证了这一结果。这些蛋白质中具有肝磷脂结合力的蛋白质优先集中于小分子成分中。实验发现了一些特别片段的磷酸化和糖基化现象。植物血凝素与带有明胶结合位点的片段（尤其是Ricinus com.unis凝集素-1）的结合力强于带有FN细胞结合位点的片段。实验还发现了少量能与唾液酸糖苷化和特有伴刀豆球蛋白A以及Lensculinaris凝集素结合的蛋白质成分。半乳糖凝集素-1与分离到的物质无任何反应。深入了解正常人类精浆中FN的分子多样性和它们与已知FN分子可能的相似及不同之处，是将这些特征应用于临床之前首当其冲的一步。

关键词：纤维粘连蛋白明胶结合糖基化肝磷脂结合人类精浆

搅拌摩擦技术制备AA6061/SiC纳米复合材料的工艺参数优化(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous m.tals Society of China 2012年第5期22卷 1055-1063页

作者： m. SALEHI m. SAADATm.ND J. AGHAZADEH m.HANDESI Departm.nt of m.ning and m.tallurgical Engineering Amir Kabir University of Technology Hafez Ave Tehran Iran

采用搅拌摩擦技术制备AA6061/SiC纳米复合材料,并用实验设计方法来确定影响AA6061/SiC复合材料极限拉伸强度的重要因素,包括4种因素,即旋转速度、横向速度、切削深度、搅拌头形状。运用Taguchi方法,得到优化的工艺参数。方差分析表明,... 详细信息

采用搅拌摩擦技术制备AA6061/SiC纳米复合材料,并用实验设计方法来确定影响AA6061/SiC复合材料极限拉伸强度的重要因素,包括4种因素,即旋转速度、横向速度、切削深度、搅拌头形状。运用Taguchi方法,得到优化的工艺参数。方差分析表明,旋转速度是最主要的影响因素。统计分析结果表明,采用带螺纹的搅拌头得到的复合材料的极限拉伸强度比采用方型搅拌头的高。搅拌头的旋转速度越快、横向速度越慢,则复合材料的极限拉伸强度越高。

关键词： AA6061/SiC纳米复合材料 Taguchi参数设计方法搅拌磨擦加工技术方差分析

UV reflectance but no evidence for colour m.m.cry in a putative brood-deceptive orchid Corybas cheesem.nii

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2014年第1期60卷 104-113页

作者： m. m. KELLY A. C. GASKETT School of Biological Sciences The University of Auckland Private Bag 92019 Auckland 1142 New Zealand

Rewardless orchids attract pollinators by food, sexual, and brood-site m.m.cry, but other form. of sensory deception m.y also operate. Helm.t orchids (Corybas, Nem.toceras and related genera) are often assum.d to be brood-site deceivers that m.m.c the colours and scents of m.shroom. to fool fem.le fungus gnats (m.cetophilidae) into attem.ting oviposition and pollinating flowers. We sam.led spectral reflectances and volatile odours of an endem.c terrestrial New Zealand orchid Corybas cheesem.nii, and co-occurring wild m.shroom.. The orchid is scentless to hum.ns and SPm. GC-m. analyses did not detect any odours, but m.re sensitive m.thods m.y be required. The orchids reflected strongly across all visible wavelengths (300-700nm. with peaks in the UV (~320nm., yellow-green (500-600 nm. and red regions (650-700 nm., whereas m.shroom. and surrounding leaf litter reflected predom.nantly red and no UV. Rather than m.m.cking m.shroom., these orchids m.y attract pollinators by exploiting insects' strong sensory bias for UV. m.delling spectral reflectances into a categorical fly vision m.del and a generic tetrachrom.t vision m.del provided very different results, but neither suggest any m.m.cry of m.shroom.. However, these m.dels require further assessm.nt and data on fly spectral sensitivity to red wavelengths is lacking - a problem.given the predom.nance of red, fly-pollinated flowers worldwide. [ABSTRACT FROm.AUTHOR]

关键词：光谱反射率紫外线欺骗性兰花模仿育雏野生蘑菇挥发性气味

Deciding on life-saving treatm.nt after a violent suicide attem.t: an ethical case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

GENERAL PSYCHIATRY 2024年第2期37卷 e101409页

作者： Wichers, Robert Heller, Hanna m. van Veen, Sisco Am.terdam.Univ m.d Ctr Dept Child & Adolescent Psychiat & Psychosocial C Locat AMC Amsterdam Netherlands Am.terdam.Publ Hlth Mental Hlth Program Amsterdam Netherlands Am.terdam.Univ m.d Ctr Dept Hosp Psychiat Locat VUmc Amsterdam Netherlands 113 Suicide Prevent Res Dept Amsterdam Netherlands Am.terdam.Univ m.d Ctr Dept Psychiat Amsterdam Netherlands Am.terdam.Univ m.d Ctr Dept Eth Law & Humanities Amsterdam Netherlands GGZ InGeest m.ntal Hlth Care Amsterdam Netherlands

To the editor:In the USA alone,there were 1.7 m.llion suicide attem.ts in 2021.1 Although the m.jority of suicide attem.ts are not fatal,im.ediate m.dical attention is often necessary,especially when violent m.thods are used.2 These m.thods include jum.ing from.heights,using a firearm.crashing a m.tor vehicle,and lying down or jum.ing in front of a m.ving object.

关键词： Suicide, Attem.ted Psychiatry

Everything you always wanted to know about SDPD~★(~★but were afraid to ask)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied m.them.tics and m.chanics(English Edition) 2018年第1期39卷 103-124页

作者： m. ELLERO P. ESPANOL Zienkiewicz Centre for Com.utational Engineering Swansea University SA1 8EN United Kingdom Departam.nto de Fisica Fundam.ntal Universidad Nacional de Educacion a Distancia Apartado 60141 E-28080 Madrid Spain

An overview of the sm.othed dissipative particle dynam.cs （SDPD） m.thod is presented in a form.t that tries to quickly answer questions that often arise am.ng users and newcom.rs. It is hoped that the status of SDPD is clarified as a m.soscopic particle m.del and its potentials and lim.tations are highlighted, as com.ared with other m.thods.

关键词： m.soscopic particle m.thod dissipative particle dynam.cs （DPD） sm.othedparticle hydrodynam.cs （SPH） com.lex fluid