检索结果-南通市图书馆

Convergence of the turkey gut microbiota following cohabitation under commercial settings

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 Animal Science and Biotechnology 2021年第4期12卷 1635-1644页

作者： Elizabeth A.Miller Brittanie winfield Bonnie P.Weber Cristian Flores-Figueroa Jeannette Munoz-Aguayo Jared Huisinga Timothy J.Johnson Department of Veterinary and Biomedical Sciences University of MinnesotaSaint PaulMNUSA University of Minnesota Mid-Central Research and Outreach CenterWillmarMNUSA Science Innovations WillmarMNUSA

Background:Microbiota development is a critical aspect of turkey poult maturation,and the succession of microbes in the turkey gut has been shown to correlate with poult *** purpose of this study was to determine the fate of the microbiota in turkey poults after movement of birds first raised in an isolated hatch brood system into a more traditional commercial brood facility with pre-existing *** poults were first divided into groups raised in conventional brood pens from day-of-hatch and those raised in an experimental hatch brood *** 11 days of growth,hatch brood birds were moved into pens within the conventional brood barn and monitored for an additional 18 *** of both hatch brood and conventional pen birds was performed at multiple timepoints throughout the study,and cecal content was used to analyze the bacterial microbiota using 16S rRNA gene amplicon ***:Alpha diversity tended to be higher in samples from conventional pen birds compared to those from hatch brood birds prior to the day 11 move,but the difference between systems was not observed *** beta diversity metrics,bacterial community succession appeared delayed in the hatch brood system birds pre-move,but post-move community composition quickly converged with that of the conventional pen *** was validated through assessment of significantly different genera between hatch brood system and conventional pen birds,where numbers of significantly different taxa quickly decreased following the *** key taxa previously associated with poult performance were delayed in their appearance and relative abundance in hatch brood ***:Overall,this study demonstrates that the use of isolated hatch brood systems has an impact on the poult gut microbiota,but its impact is resolved quickly once the birds are introduced into a conventional brood ***,the benefits of pathogen reduction with hatch brood systems may out

关键词： Brood Gut Hatch Microbiota Poult Succession Turkey

Adaptive Sliding Mode Control for MIMO Nonlinear Systems Based on Fuzzy Logic Scheme

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2004年第1期1卷 51-62页

作者： Alan FT winfield Chris Melhuish Intelligent Autonomous Systems Laboratory Intelligent Autonomous Systems Laboratory Faculty of Computing Engineering and Mathematical Sciences University of the West of England Frenchay Campus Coldharbour Lane Bristol BS16 1QY UK Faculty of Computing Engineering and Mathematical Sciences University of the West of England Frenchay Campus Coldharbour Lane Bristol BS16 1QY UK

In this study an indirect adaptive sliding mode control (SMC) based on a fuzzy logic scheme is proposed to strengthen the tracking control performance of a general class of multi-input multi-output (MIMO) nonlinear uncertain systems. Combining reaching law approach and fuzzy universal approximation theorem, the proposed design procedure combines the advantages of fuzzy logic control, adaptive control and sliding mode control. The stability of the control systems is proved in the sense of the Lyapunov second stability theorem. Two simulation studies are presented to demonstrate the effectiveness of our new hybrid control algorithm.

关键词： Fuzzy logic control (FLC) sliding mode control (SMC) multi input multi output (MIMO) nonlinear uncertain systems adaptive control variable structure system (VSS)

利用强子探针研究奇特原子核的点质子分布半径及强子探针效应

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2024年第11期69卷 1647-1652页

作者：张寂潮孙保华 Isao Tanihata Rituparna Kanungo Christoph Scheidenberger Satoru Terashima 王枫 Frederic Ameil Joel Atkinson Yassid Ayyad Soumya Bagchi Dolores Cortina-Gil Iris Dillmann Alfredo Estradé Alexey Evdokimov Fabio Farinon Hans Geissel Giulia Guastalla Rudolf Janik Satbir Kaur Ronja Knöbel Jan Kurcewicz Yury Litvinov Michele Marta Magdalena Mostazo Ivan Mukha Chiara Nociforo Hooi Jin Ong Stephane Pietri Andrej Prochazka Branislav Sitar Peter Strmen Maya Takechi Junki Tanaka Jossitt Vargas Helmut Weick John Stuart winfield School of Physics Beihang UniversityBeijing 100191China Research Center for Nuclear Physics(RCNP) Osaka UniversityOsaka 567-0047Japan Astronomy and Physics Department Saint Mary’s UniversityHalifax B3H 3C3Canada TRIUMF Vancouver V6T 4A3Canada GSI Helmholtzzentrum für Schwerionenforschung Darmstadt D-64291Germany Justus-Liebig University Gießn 35392Germany Helmholtz Research Academy Hesse for FAIR(HFHF) GSI Helmholtz Center for Heavy Ion ResearchGießn 35392Germany Universidad de Santiago de Compostela Santiago de Compostella E-15706Spain Department of Physics Indian Institute of Technology(Indian School of Mines)Dhanbad 826004India Faculty of Mathematics and Physics Comenius UniversityBratislava 84215Slovakia Department of Physics and Atmospheric Science Dalhousie UniversityHalifax B3H 4R2Canada

We report the charge-changing cross sections(σ_(cc))of 24 p-shell nuclides on both hydrogen and carbon at about 900A MeV,of which^(8,9)Li,^(10–12)Be,^(10,14,15)B,^(14,15,17–22)N and^(16)O on hydrogen and^(8,9)Li on carbon are for the first *** from the data set,we found a new and robust relationship between the scaling factor of the Glauber model calculations and the separation energies of the nuclei of interest on both *** allows us to deduce proton radii(R_p)for the first time from the cross sections on *** identical R_p values are deduced from both target data for the neutron-rich carbon isotopes;however,the R_p from the hydrogen target is systematically smaller in the neutron-rich nitrogen *** calls for further experimental and theoretical investigations.

关键词： Exotic nuclei Nuclear size Reaction cross section Glauber model Radioactive ion beam

Survey of Controllable Suspension System for Off-road Vehicles

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2007年第3期3卷 161-171页

作者：吴志成朱全民陈思忠 Alan winfield 杨林张斌 Faculty of Computing Engineering and Mathematical SciencesUniversity of the West of England School of Mechanical and Vehicular Engineering Beijing Institute of Technology

The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing.

关键词：越野车可控悬架控制理论主动悬架

在线全文

学校读者我要写书评

暂无评论

微波技术的过去,现在和未来

系统工程与电子技术 1979年第2期 61-64页

作者： winfield E. Fromm ,苏峥

微波技术的进展与数字电子学领域相比较,虽然在许多方面似乎是逐渐发展的,但是当人们用历史的观点来看时,可以清楚地看出它的进展仍然是迅速的。微波技术已经发生了巨大的变化。它改变着微波技术和以此为基础的微波设备,且这种变化日益... 详细信息

微波技术的进展与数字电子学领域相比较,虽然在许多方面似乎是逐渐发展的,但是当人们用历史的观点来看时,可以清楚地看出它的进展仍然是迅速的。微波技术已经发生了巨大的变化。它改变着微波技术和以此为基础的微波设备,且这种变化日益频繁。在这样的情况下,人们都打算对微波技术的前景作一估价,为此,就我们预见所及和有限的篇幅作如下探讨。

关键词：毫米波段微波技术电子技术千兆赫场效应晶体管单极晶体管场效应器件光学技术

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

泌尿科的经腹腔镜手术

国外医学（泌尿系统分册） 1992年第5期12卷 227-230页

作者： winfield HN 吉名显

近年来经腹腔镜手术进展较快,普外医生在经腹腔镜行胆囊切除方面已领先一步,但泌尿科医生在这方面相对较慢。至目前还仅限于经腹腔镜行隐睾定位、性腺活检、盆腔淋巴结切除术及精索静脉曲张结扎术,对这几种手术的方法、术前准备及术中... 详细信息

近年来经腹腔镜手术进展较快,普外医生在经腹腔镜行胆囊切除方面已领先一步,但泌尿科医生在这方面相对较慢。至目前还仅限于经腹腔镜行隐睾定位、性腺活检、盆腔淋巴结切除术及精索静脉曲张结扎术,对这几种手术的方法、术前准备及术中术后并发症的防治,作者进行了详细的描述。因为腹腔镜手术干扰小,患者易于接受,相信在使用的过程中随着经验不断的丰富,器械不断的改进,将来替代传统的开放手术将是泌尿科腔内手术的一个方向。

关键词：泌尿病手术腹腔镜

在线全文

学校读者我要写书评

暂无评论

2.4GHz频段上的新一代点对点无线技术

世界电子元器件 2004年第1期 28-30页

作者： David Wright Ryan winfield-Woodings 赛普拉斯半导体公司

替代电缆的解决方案在设备之间实现无线通信是许多消费产品开发人员由来已久的梦想.然而,长期以来,无线电频谱资源一直是各国政府的管制对象,对其使用有着种种限制,目的是防止来自不同信号源的RF信号相互干扰.在大多数国家里,大部分无... 详细信息

替代电缆的解决方案在设备之间实现无线通信是许多消费产品开发人员由来已久的梦想.然而,长期以来,无线电频谱资源一直是各国政府的管制对象,对其使用有着种种限制,目的是防止来自不同信号源的RF信号相互干扰.在大多数国家里,大部分无线电频谱是为广播、电视、军事、应急服务以及近期迅速普及的移动电话之用而保留的.

关键词：无线通信点对点无线技术蓝牙非联网网络开销

在线全文

学校读者我要写书评

暂无评论

印加农林业:来自历史的教训

AMBIO－人类环境杂志 2000年第6期29卷 322-328页

作者： Alex chepstow-Lusty Mark winfield 李香莲剑桥大学

印加的历史记录表明他们非常重视树木并进行植树实践以满足其燃料和木料所需。这些记录由来自古生态学和考古学两方面证据予以验证,这些证据表明在约公元1100年的全球升温显著期间乔木树种迅速增加。这些自然植被是对环境改善状态的反应... 详细信息

印加的历史记录表明他们非常重视树木并进行植树实践以满足其燃料和木料所需。这些记录由来自古生态学和考古学两方面证据予以验证,这些证据表明在约公元1100年的全球升温显著期间乔木树种迅速增加。这些自然植被是对环境改善状态的反应,而它也促进了经营管理活动;这表明安第斯山农林业历史悠久。随着16世纪30年代西班牙的入侵,土地管理工作发生了变化,森林资源不断被过度开发。多学科的研究可为秘鲁现代政策决策者提供重要的历史参考。广植桉树并不见得是恰当的解决方法。土地恢复项目应考虑自然多样性,利用一系列当地树种。考虑到当前正处于温度上升期,这点是有意义的,并有助于缓解土壤侵蚀和农村贫困。

关键词：农业林业印加秘鲁历史

在线全文

学校读者我要写书评

暂无评论

当电视遇到网络

疯狂英语（初中天地） 2008年第3期 48-48页

作者： Nick winfield 宁波

将激增的互联网视频转移到电视机上——这是科技商业中的一只"圣杯"。不过,到目前为止。

关键词：互联网视频苹果公司电视节目