检索结果-南通市图书馆

昆虫学报 2011年第10期54卷 1133-1139页

作者：刘琼霞文礼章周华建吴倩 m.rvin k.harris 肖治术湖南农业大学生物科学与生物技术学院长沙410128 中国科学院动物研究所农业虫鼠害综合治理研究国家重点实验室北京100101 郑州大学生物工程系郑州450001 College Station Texas A&M UniversityTexas 77843USA

黄连木Pistacia chinensis Bunge因果实含油量高,被作为生物能源树种在我国进行大面积栽培推广和能源开发利用。然而,专性寄生害虫(主要为黄连木广肩小蜂Eurytom. plotnik.vi Nik.lsk.ya)的危害及由单性结实和败育所造成的空壳果实可能... 详细信息

黄连木Pistacia chinensis Bunge因果实含油量高,被作为生物能源树种在我国进行大面积栽培推广和能源开发利用。然而,专性寄生害虫(主要为黄连木广肩小蜂Eurytom. plotnik.vi Nik.lsk.ya)的危害及由单性结实和败育所造成的空壳果实可能影响黄连木的果实产量和质量。为了评价种子害虫和空壳果实对黄连木果实产量和质量的影响,我们测定了河南省济源市3个黄连木种群40株结果雌树的果实产量和油产量,同时测定了完好果实、空壳果实和虫蛀果实等3类果实的干重和含油量。结果表明:(1)虫害率和空壳率分别达22.6%和53.0%,且不同个体和种群间均存在显著差异(Pm./果)和虫蛀果实(33.1m./果)的干重均不到完好果实(67.4m./果)的一半;空壳果实(3.9%)和虫蛀果实(3.8%)的含油量均显著低于完好果实(39.9%)。(3)实测的果实产量(2.9k./树)和油产量(0.6k./树)分别仅为期望产量的50%(4.7k./树)和33%(1.9k./树),但在3个种群之间无显著差异。本研究显示小蜂危害和空壳果实对黄连木果实产量和质量能造成严重影响,在将其作为生物能源树种利用时对此应加以克服。

关键词：黄连木生物能源生物能源树种种子小蜂黄连木广肩小蜂空壳果实果实产量油产量

Enhanced m.gnetostrictive properties of lightly Pr-doped Fe83Ga17 alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第3期38卷 257-264页

作者： Lijuan Zhao Xiao Tian Zhanquan Yao Xuan Zhao Rui Wang Ham. O Liping Jiang Vincent G.harris Inner m.ngolia k.y Laboratory for Physics and Chem.stry of Functional m.terials School of Physics and Electronic InformationInner Mongolia Normal UniversityHohhot 010022China School of Water Conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Baotou Research Institute of Rare Earths Baotou 014030China Departm.nt of Electrical and Com.uter Engineering CM3ICNortheastern UniversityBostonMA 02115USA

Fe83Ga17Prx alloys,where x=0,0.2,0.4,0.6 and 1.0,were prepared by a non-consum.ble vacuum.arc m.lting technique under an inert argon gas *** crystal structure and surface m.rphologies of the alloys were studied by X-ray diffraction(XRD) and scanning electron m.croscopy(SEm.,*** com.ositional variations were m.asured by energy dispersive X-ray spectroscopy(EDXS).The m.gnetostriction coefficients of the alloys were m.asured by m.ans of a differential resistive strain *** m.gnetism.of the sam.le was m.asured by a vibrating sam.le m.gnetom.ter(VSm..The results show that the parent Fe83Ga17 alloy consists of a single A2 phase of bcc sym.etry,whereas the Pr doped Fe83Ga17 alloys are com.osed of the A2 phase of bcc structure and a sm.ll volum. fraction of PrGa2 as a secondary *** im.ortantly,with increasing x,the m.gnetostriction coefficient of the Fe83Ga17Prx alloys first increases reaching a m.xim.m.saturation m.gnetostriction coefficient of192 ppm.for x=0.6 at a m.gnetic field strength of 486 k./m.then *** m.xim.m.represents a 400% increase over the parent alloy with a m.re 0.6 at% Pr doping.

关键词： Fe-Ga alloy m.gnetostriction Praseodym.um Rare earth elem.nt doping

Investigation of free am.no acid, total phenolics,antioxidant activity and purine alk.loids to assess the health properties of non-Cam.llia tea

在线全文

学校读者我要写书评

暂无评论

Acta Pharm.ceutica Sinica B 2016年第2期6卷 170-181页

作者： Wu Bi Chunnian He Yunyun m. Jie Shen Linghua harris Zhang Yong Peng Peigen Xiao Institute of m.dicinal Plant Developm.nt Chinese Academy of Medical Science Peking Union Medical College k.y Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal m.dicine Ministry of Education Phyto m.dix Co.

To find novel functional beverages from.folk.teas, 33 species of frequently used non-Cam.llia tea(plants other than Cam.llia) were collected and com.ared with Cam.llia tea(green tea, pu-erh tea and black.tea) for the first tim.. Data are reported here on the quantities of 20 free am.no acids(FAAs) and three purine alk.loids(m.asured by UHPLC), total polyphenols(m.asured by Folin-Ciocalteu assay), and antioxidant activity(DPPH). The total am.unts of FAAs in non-Cam.llia tea(0.62–18.99 m./g) are generally less than that of Cam.llia tea(16.55–24.99 m./g). However, for certain FAAs, the quantities were m.ch higher in som. non-Cam.llia teas, such as γ-am.nobutyric acid in teas from.Am.elopsis grossedentata, Isodon serra and Hibiscus sabdariffa. Interestingly, theanine was detected in tea from.Potentilla fruticosa(1.16±0.81 m./g). Furtherm.re, the content of polyphenols in teas from.A. grossedentata, Acer tataricum.subsp. ginnala are significantly higher than those from.Cam.llia tea;teas from.I. serra, Pistacia chinensis and A. tataricum.subsp. ginnala have rem.rk.ble antioxidant activities sim.lar to the activities from.green tea(44.23 μg/m.L). Purine alk.loids(caffeine, theobrom.ne and theophylline) were not detected in non-Cam.llia teas. The investigation suggest som. non-Cam.llia teas m.y be great functional natural products with potential for prevention of chronic diseases and aging,by providing with abundant polyphenols, antioxidants and specific FAAs.

关键词： Non-Cam.llia tea Am.no acids Polyphenols Purine alk.loids Antioxidant activity

在线全文

学校读者我要写书评

暂无评论

滚动轴承分析.第1卷,轴承技术的基本概念

DETERm.NATION OF m.LECULAR CRYSTAL STRUCTURES ON A LABORATORY POWDER DIFFRACTOm.TER

丛书名：国际机械工程先进技术译丛

2015年

作者： (美) T. A. harris m. N. k.tzalas

本卷为基本概念卷, 内容共14章, 包括滚动轴承的类型、宏观几何学、配合与游隙、载荷与速度、应力与变形、位移与预载荷、摩擦力矩、疲劳寿命、润滑、材料、振动与噪声及工况监测等。

ISBN: (纸本)9787111279822

关键词：滚动轴承

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

DETERMINATION OF MOLECULAR CRYSTAL STRUCTURES ON A LABORATOR...

Integrated pest m.nagem.nt concepts for red im.orted fire ants Solenopsis invicta （Hym.noptera： Form.cidae）

Sixteenth Congress of the International Union of Crystallography

作者： P.Lightfoot m.Trem.yne k.D.m.harris P.G.Bruce Departm.nt of Chem.stry University of St AndrewsSt AndrewsFifeScotland

＜正＞m.ny problem. in m.terials chem.stry require detailed structural inform.tion about the m.terials under *** such inform.tion has been obtained by single crystal X-ray diffraction, however,m.ny m.terials cannot be obtained in single crystal form. In recent years it has been shown that sim.le crystal structures can be determ.ned ab initio by powder diffraction techniques,often at a

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

Insect Science 2013年第4期20卷 429-438页

作者： Bastiaan m. Drees Alejandro A. Calixto Paul R. Nester Texas AgriLife Extension Service Texas A&M System Mail Stop 2475 Department of Entomology College Station TX 77843-2475 Dew AgroSciences CPRD Wesley Chapel FL 33543 harris Co. Texas AgriLife Extension Service Texas A&M University System TXUSA

m.nagem.nt of im.orted fire ant species has evolved since their accidental introduction into the United States and currently uses integrated pest m.nagem.nt concepts to design, im.lem.nt, and evaluate suppression program.. Although eradication is the m.nagem.nt goal in certain isolated infestation sites, localized goals vary dram.tically in larger infestations where reinvasion of treated areas is lik.ly. These goals are influenced by regulatory policies, m.dical liabilities, ecological im.act, and/or econom.c considerations. Tactics em.loyed in fire ant m.nagem.nt program. presented here include cultural and biological control options along with judicious use of site-specific insecticide products. In addition, program.design considerations that include m.nagem.nt goal（s）, action level（s）, ant form.（m.nogyne or polygyne）, presence ofnontarget ant species, size of treatm.nt area, seasonality, im.lem.ntation cost, and environm.ntal im.act are also presented. Optim.lly, elegant IPm.program. are target specific, threshold driven, environm.ntally friendly and cost-effective.

关键词： im.orted fire ants integrated pest m.nagem.nt IPm.concepts Solenopsisinvicta Solenopsis richteri

高粱瘿蚊和在澳大利亚的Contarinia属的十一个新种

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

植物检疫 1982年第1期 29-42页

作者： k.m.harris 张从仲

绪言高粱瘿蚊Contarinia sotghicola(Coquillett)是北美洲、南美洲、非洲、亚洲和澳大利亚栽培高粱的重要害虫,造成谷物严重损失,还能影响饲料作物种子产量。通常认为它有一个局限的寄主范围,限于栽培和野生的高粱属种类,因而分类学和... 详细信息

绪言高粱瘿蚊Contarinia sotghicola(Coquillett)是北美洲、南美洲、非洲、亚洲和澳大利亚栽培高粱的重要害虫,造成谷物严重损失,还能影响饲料作物种子产量。通常认为它有一个局限的寄主范围,限于栽培和野生的高粱属种类,因而分类学和生物学的研究常常拘泥在这个范围内。然而Passlow(1965)报导,在澳大利亚昆士兰本

关键词：雌虫鞭节额唇基后侧片高粱属 Contarinia 雄虫尾须寄主植物澳大利亚大洋洲

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

运用离散震源和接收器阵列的绕射层析

地球物理学进展 1989年第1期4卷 50-58页

作者： J.m.harris 王杰

我们提出了线源阵列绕射层析的理论及其数值模拟结果,一些方法适用于离散源和接收器放在重建目标附近,而非远场的大量成象问题,因此,这些新的成果冲击了至今还主要以平面波源为基础的许多逆散射研究。我们的推导包含了合成平面波的方法... 详细信息

我们提出了线源阵列绕射层析的理论及其数值模拟结果,一些方法适用于离散源和接收器放在重建目标附近,而非远场的大量成象问题,因此,这些新的成果冲击了至今还主要以平面波源为基础的许多逆散射研究。我们的推导包含了合成平面波的方法,得出基于广义投影-切片原理的反演公式。尽管用离散阵列合成平面波的有关方法是已知的,但是导出把合成法直接并入散射公式的理论是有帮助的。本文提出了弱非均匀介质中满足Born和Rytov近似的传播场公式,这些公式为处理散射和逆散射问题提供了一种简便算法。以一个数值例子说明了绕射层析反演的两个重要特点:1)有限视野的影响,2)用不同频率信号探测的结果。该例子利用了由精确的正演模拟方法得出的数据,因而为证明弱散射近似对反问题的有效性提供了有力的证据。

关键词：正演模拟线源重建目标反演公式倾斜叠加逆散射问题非均匀介质广义投影信号探测反演方法

在线全文

学校读者我要写书评

暂无评论

昆士兰实蝇未成熟阶段的形态学

植物检疫 1992年第4期6卷 282-287页

作者： m.m.Elson-harris 粱广勤广州动植物检疫局

前言实蝇科幼虫几乎可为害整株植物,尤其是果实、花和茎。这类害虫损伤水果和蔬菜,造成世界性严重经济损失。多数的研究主要是成虫,而对幼虫则甚少。未成熟阶段研究得比较多的是地中海实蝇,Ceratitis capitafa(Wiedem.nn)和墨西哥实蝇,A... 详细信息

前言实蝇科幼虫几乎可为害整株植物,尤其是果实、花和茎。这类害虫损伤水果和蔬菜,造成世界性严重经济损失。多数的研究主要是成虫,而对幼虫则甚少。未成熟阶段研究得比较多的是地中海实蝇,Ceratitis capitafa(Wiedem.nn)和墨西哥实蝇,Anastrepha ludes(Loew)。

关键词：昆士兰实蝇形态学害虫检疫