检索结果-南通市图书馆

Structural,electroni.,opti.al,and magneti. properti.s of Co-doped cu2O

在线全文

学校读者我要写书评

暂无评论

Chi.ese Physi.s B 2017年第2期26卷 387-391页

作者： i.Djabri.T Rezkallah F Chemam Laboratoi.e de la Physi.ue Appli.uee et Theori.ue Departement des Sciences de la matiere Universite Laarbi tebessi tebessa Algeri

We i.vesti.ate the magneti. properti.s of Co-doped cu_2O. We studi.d fi.st the electroni. and structural properti.s of cu_2O usi.g the opti.i.ati.n of the latti.e constant whi.h i. 4.18 . The calculated gap i. found between 0.825 eV and1.5 eV, these values are i. good agreement wi.h the experi.ental results. The Co atoms are i.serted i. cu_2O by means of the densi.y functi.nal theory（DFT） usi.g LSDA, LSDA ＋U, and LSDA ＋ MBJ approxi.ati.ns i. the Wi.N2 k code, based on the supercell model by setti.g up 12, 24, and 48 atoms i.（1×1 × 2）,（1 × 2 × 2）, and（2 × 2×2） supercells respecti.ely wi.h one or two copper atoms bei.g replaced by cobalt atoms. The energy di.ference between the ferromagneti. and anti.erromagneti. coupli.g of the spi.s located on the substi.ute Co has been calculated i. order to obtai. better i.si.ht i.to the magneti. exchange coupli.g for thi. parti.0}lar compound. The studi.d compound exhi.i.s stable i.teger magneti. moments of 2 μBand 4 μBwhen i. i. doped wi.h 2 atoms of Co. Opti.al properti.s have also been worked out. The results obtai.ed i. thi. study demonstrate the i.portance of the magneti. effect i. cu_2O.

关键词： cu2O electroni. structure magneti. properti.s opti.al properti.s

Esti.ati.n of Heavy Metal Levels i. the Muscle, Gi.zard, Li.er and Ki.ney of Broi.er, Layer and Local (Cockerel) Chi.kens Rai.ed wi.hi. Awka Metropoli. and i.s Envi.ons, Anambra State, South Eastern Ni.eri.

在线全文

学校读者我要写书评

暂无评论

Journal of Envi.onmental Protecti.n 2015年第6期6卷 609-613页

作者： P. A. C. Okoye V. i. E. Aji.e O. R. Okeke i. i. Ujah U. B. Asalu D. O. Okeke Pure and i.dustri.l Chemi.try Department Nnamdi Azikiwe Univeristy Awka Nigeria Opti.al Secti.n Scientific Equipment Development Institute Enugu Nigeria Department of Bi.chemi.try University of Nigeria Nsukka Nigeria Plasti. Secti.n Scientific Equipment Development Institute Enugu Nigeria Department of Appli.d Bi.chemi.try Nnamdi Azikiwe University Awka Nigeria

65 chi.kens (layer, broi.er and cockerel) from di.ferent farms wi.hi. Awka metropoli. and i.s envi.ons were purchased, processed and analyzed for the levels of heavy metals (Pb, As, Cd, Ni. Cr, Hg, V and cu) i. the i.ternal organs (muscle, gi.zard, li.er and ki.ney) of the chi.kens usi.g flame atomi. absorpti.n spectrometer after ni.ri./perchlori. aci. di.esti.n. The ranges of mean concentrati.ns of the metals i. the i.ternal organs of the chi.kens i. mg/g were Pb;(0.046 - 0.478) As;(0.053 - 0.318), Cd;(0.027 - 0.649), Cr;(0.045 - 0.234), Hg;(0.052 - 0.740), Ni.(0.038 - 0.534), V;(0.037 - 0.053), and cu;(0.146 - 0.445). About 10% - 40% of Pb, Cd and Hg exceeded the permi.si.le level of 0.5 ppm set for these metals i. the li.er and ki.ney of the chi.kens. Anova analysi. revealed si.ni.i.ance of the heavy metals i. the i.ternal organs of the chi.kens at p < 0.05.

关键词： Heavy Metals Bi.accumulati.n Li.er Muscle Gi.zard Ki.ney Envi.onmental Polluti.n

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

公司治理、声誉机制与权益资本成本

湘潭大学学报（哲学社会科学版） 2013年第5期37卷 57-61页

作者：醋卫华湘潭大学商学院湖南湘潭411105

以2004—2008年"中国最受尊敬的企业"为研究样本,实证检验公司声誉与权益资本成本之间的关系。发现研究组与参照组之间的权益资本成本存在明显差异,回归结果表明,良好的公司声誉能够显著降低权益资本成本。研究结论不仅为声誉机制的公... 详细信息

以2004—2008年"中国最受尊敬的企业"为研究样本,实证检验公司声誉与权益资本成本之间的关系。发现研究组与参照组之间的权益资本成本存在明显差异,回归结果表明,良好的公司声誉能够显著降低权益资本成本。研究结论不仅为声誉机制的公司治理研究提供了机理方面的直接证据,而且也为转型经济国家在市场化过程中如何更好地发挥声誉机制的作用提供了政策建议。

关键词：公司治理声誉机制权益资本成本

在线全文

学校读者我要写书评

暂无评论

试论汉语面称使用中的若干策略

语言文字应用 2009年第2期 84-92页

作者：崔显军天津外国语学院国际交流学院天津300204

内地普通话中有指称男老师或师傅妻子的面称——"师母",却没有配套的指称女老师或师傅丈夫的面称,依据有历史和现实基础原则和约定俗成原则,运用借贷补位策略,引进指称女老师或师傅等女性社会角色的丈夫的词——"师丈",可填补面称的缺... 详细信息

内地普通话中有指称男老师或师傅妻子的面称——"师母",却没有配套的指称女老师或师傅丈夫的面称,依据有历史和现实基础原则和约定俗成原则,运用借贷补位策略,引进指称女老师或师傅等女性社会角色的丈夫的词——"师丈",可填补面称的缺位。此外,还可针对其他不对称现象,依据不同的原则,分别使用替换策略、提升策略、缩简策略、专化策略、设问或设问选择策略、美誉策略、反常策略等,以切实消解汉语面称中的若干不对称。

关键词：面称师丈补位策略替换策略提升策略缩简策略

《思想道德修养与法律基础》课程的教学理念及其张扬

在线全文

学校读者我要写书评

暂无评论

大学教育科学 2010年第2期 35-38页

作者：匡促联湖南理工学院社科部湖南岳阳414006

"基础课"的课程性质、历史使命和实施条件决定了该课程教学理念的真实意蕴是培育大学生的现代道德人格。任务化、娱乐化、知识化的"基础课"教学实效的低下源于它们对这一教学理念的偏离。在深刻体认教学理念、努力践行"育人为本"教学模... 详细信息

"基础课"的课程性质、历史使命和实施条件决定了该课程教学理念的真实意蕴是培育大学生的现代道德人格。任务化、娱乐化、知识化的"基础课"教学实效的低下源于它们对这一教学理念的偏离。在深刻体认教学理念、努力践行"育人为本"教学模式、建立专门的教学评价制度中张扬"基础课"教学理念是保障"基础课"教学实效的根本。

关键词：教学理念偏离教学理念张扬教学理念

Compari.on of Di.ferent Extracti.n Approaches for Heavy Metal Parti.i.ni.g i. Sedi.ent Samples

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2009年第4期19卷 476-485页

作者： M. B. ARAi. T. G. KAZi.M. K. JAMALi.J. A. BAi. H. i. AFRi.i.N. JALBANi.R. A. SARFRAZ1 Nati.nal Centre of Excellence i. Analyti.al Chemi.try Sindh University Government Degree College Usta Mohammad Paki.tan Counci. for Sci.nti.i. and i.dustri.l Research University Road

Three extracti.n methods, ultrasoni. assi.ted extracti.n (USE), mi.rowave assi.ted extracti.n (MSE), and conventi.nal si.gle extracti.n (CSE), i. conjuncti.n wi.h the modi.i.d three-stage BCR sequenti.l extracti.n procedure (SEP) were appli.d to exami.e the contents of Cd, cu, Cr, Ni. Pb and Zn from lake sedi.ent samples, to know whether these techni.ues can reduce extracti.n ti.e and i.prove reproduci.i.i.y. The SEP and developed alternati.e si.gle extrac- ti.n methods were vali.ated by the analysi. of certi.i.d reference materi.l BCR 601. By the use of opti.i.ed soni.ati.n and mi.rowave condi.i.ns, steps 1, 2 and 3 of the BCR sequenti.l extracti.n methods (excludi.g the hydrogen peroxi.e di.esti.n i. step 3, whi.h was not performed wi.h soni.ati.n and mi.rowave) could be completed i. 15-30 mi. and 60- 150 s, respecti.ely. The recoveri.s of total extractable metal contents i. BCR 601, obtai.ed by three si.gle extracti.ns ranged from 93.3%-102%, 88.9%-104% and 81.2%-96.2% for CSE, USE and MSE, respecti.ely. The preci.i.n of the si.gle extracti.n methods was found i. the range of 3.7%-9.4% for all metals (n = 6).

关键词： heavy metals lake sedi.ent mi.rowave si.gle extracti.n modi.i.d BCR sequenti.l extracti.n ultrasoni. si.gle extracti.n

i.vesti.ati.n of a Counter Flow Mi.rochannel Heat Exchanger Performance wi.h Usi.g Nanoflui. as a Coolant

在线全文

学校读者我要写书评

暂无评论

Journal of Electroni.s Cooli.g and Thermal Control 2012年第3期2卷 35-43页

作者： Mushtaq i. Hasan Abdul Muhsi. A. Rageb Rageb Mahmmod Yaghoubi Academy of Sci.nces of i.an Tehran Iran Department of Mechani.al Engi.eeri.g College of Engineering Basra University Basra Iraq mushtaq76h@*** 2Department of Mechani.al Engi.eeri.g College of Engineering Basra University Basra Iraq

i. thi. paper the performance of a counter flow mi.rochannel heat exchanger (CFMCHE) i. numeri.ally i.vesti.ated wi.h a nanoflui. as a cooli.g medi.m. Two types of nanoflui.s are used cu-water and Al2O3-water. From the results obtai.ed i.’s found that thermal performance of CFMCHE i.creased wi.h usi.g the nanoflui.s as cooli.g medi.m wi.h no extra i.crease i. pressure drop due to the ultra fi.e soli. parti.les and low volume fracti.n concentrati.ns. The na-noflui.s (cu-water and Al2O3-water) volume fracti.ns were i. the range 1% to 5%. i.’s also found that nanoflu-i.-cooled CFMCHE could absorb more heat than water-cooled CFMCHE when the flow rate was low. For hi.h flow rates the heat transfer was domi.ated by the volume flow rate and nanoparti.les di. not contri.ute to the extra heat absorpti.n. Also the performance of CFMCHE can be i.creased consi.erably by usi.g nanoflui.s wi.h hi.her thermal conducti.i.i.s.

关键词： Nanoflui.s Mi.rochannel Heat Exchanger Effecti.eness Lami.ar Flow Numeri.al Si.ulati.n

Envi.onmental i.pacts of Feedi.g Hi.h-fi.er Di.t to Pi.s

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

Journal of Agri.0}ltural Sci.nce and Technology(A) 2013年第1期3卷 60-65页

作者： Abraham Woldeghebri.l Shanequa Smi.th Teo Bari.s Brad pope Sebhatu Gebrelul North Caroli.a A&T State Uni.ersi.y Greensboro NC 27411 USA North Caroli.a Central Uni.ersi.y Durham NC 27707 USA Southern Uni.ersi.y Baton Rouge LA 70809 USA

The concentrati.n of volati.e fatty aci.s （VFA） determi.ed from a previ.us study was used to determi.e the concentrati.n of carbon di.xi.e （CO2） and methane （CH4） i. pi. di.esta usi.g the model developed for rumi.ant ani.als. Di.esta from the stomach, cecum and colon of pi.s （n = 3 di.tl） were used for the determi.ati.n of VFA. The pi.s were fed ei.her a low fi.er di.t （LFD; 8.3% aNDF） as control, or one of the hi.h-fi.er di.ts （HFD, 22.4% aNDF; D1, D2 and D3） contai.i.g 1：2, 1：1 and 2：1, oats to barley rati.s, respecti.ely. Results i.di.ated that the concentrati.ns of CO2 and CH4 i. pi.s fed HFD were, on the average, 25.8 and 24.2%, respecti.ely lower （P 〈 0.05） than pi.s fed LFD. Pi.s fed the hi.hest oat to barley rati. also showed hi.her （P 〈 0.05） levels of CO2, （8.3%） and CH4 （5.1%）, compared to the average of the two lower rati.s （CO2, 5.3% and CH4, 3.3%）. Molar proporti.ns of VFA, CO2 and CH4 i. the gut were i. the order of VFA 〉 CO2 〉 CH4, at 53.0%, 28.6% and 18.4%, respecti.ely, and CO2 and CH4 combi.ed represented 47% of total gas.

关键词： Envi.onment fi.er methane pi. volati.e fatty aci.s.

东方智慧和西方文化可以回答“何谓人类尊严”这一问题吗?（英文）

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

文化发展论丛 2015年第3期 295-318页

作者： Hortensi. cuéllar TEC de Monterrey-Campus Ci.dad de Méxi.o

此处我提出的一在我看来一是对中西方就人类尊严优秀观点的一个回顾。我会努力阐述其中一些观点特定的价值论范式，它们异步出现于——亚洲，欧洲，美国——在区域环境上具有普遍映射。这些建议来自不同的人类与文明智慧，所有人都可以... 详细信息

此处我提出的一在我看来一是对中西方就人类尊严优秀观点的一个回顾。我会努力阐述其中一些观点特定的价值论范式，它们异步出现于——亚洲，欧洲，美国——在区域环境上具有普遍映射。这些建议来自不同的人类与文明智慧，所有人都可以培养获得。为什么不尝试呢？豁达的心胸，伸出的双手都是接受、认可、尊重他人和人类整体的象征。我的研究必然是一种综合研究。

关键词：智慧人类尊严人类遗产优良传统