检索结果-南通市图书馆

Economics of early weaning in northern great plains beef cattle production system

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences 2013年第5期4卷 219-223页

作者： John travis Mulliniks Richard C. Waterman Thomas W. Geary Department of Animal Science University of Tennessee Crossville USA USDA-ARS Fort Keogh Livestock and Range Research Laboratory Miles City USA

Early removal of the calf from its dam reduces forage needs of the cow-calf enterprise and has been found to improve BW gain and pregnancy rates in the cow herd. However, early weaning may not always be economically viable for producers and the risk should be considered carefully. This study was conducted to evaluate the effect of early and normal weaning of steer and heifer calves on net income at weaning. Calves from Angus xHereforddams were randomly assigned to one of two weaning treatments. Calves were either early weaned (EW) at 80-d of age or remained with their dams until normal weaning (NW) at 213-d of age. Calves assigned to EW treatment received a 17.5% crude protein and 0.82 Mcal/kg net energy diet for approximately 130-d in a drylot. All economic analyses were conducted at normal weaning for both NW and EW calves. At normal weaning, price of steers ($US/kg) was lower (P = 0.003) and weaned steer value ($US/steer) was greater (P P = 0.18) was found in price of heifers ($US/kg) and weaned heifer value ($US/heifer) between NW and EW heifers. Feed cost was increased (P < 0.001) in EW steers and heifers compared to NW calves. Net revenue for both weaned steers and heifers was reduced (P < 0.001) in EW calves due to the feed cost of the growing diet. This study indicates that early weaning calves at 80-d of age decrease weaned calf value and net revenue for the cow-calf segment.

关键词： Age at Weaning Beef Cattle Production Economics

马云励志演讲:别让任何人限制你的无限潜能!

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

疯狂英语（新读写） 2018年第5期 21-23页

作者： travis Scott

我没有一个有钱的父亲。尝试三次考大学都失败了。我十次申请哈佛大学,都失败了,他们甚至不想见到我。最后一次,我去了师范大学,它排在我那个城市的第三或者第四。我应聘工作,被拒绝了30次。那个时候真是太难了,我好沮丧。因为我在大学... 详细信息

我没有一个有钱的父亲。尝试三次考大学都失败了。我十次申请哈佛大学,都失败了,他们甚至不想见到我。最后一次,我去了师范大学,它排在我那个城市的第三或者第四。我应聘工作,被拒绝了30次。那个时候真是太难了,我好沮丧。因为我在大学教书,我每个月的薪水是10美元。因为在1994年时我找不到好工作。和别人讨论说我想做一个叫互联网的东西时,其中23人都反对,他们说这是愚蠢的想法。

关键词：哈佛大学师范大学互联网

在线全文

学校读者我要写书评

暂无评论

成功人士10种与众不同的思考方式

英语画刊(高中版) 2021年第7期 17-19页

作者： travis Bradberry

拥有不同人生经历的成功人士都有一个共同的特点:别人认为不可逾越的藩篱,他们却将其看作是要拥抱的挑战和要克服的阻碍物。障碍物本身并不会阻挡你的路,因为它们本身就是路。畅销书《情商2.0》的作者之一特拉维斯·布拉德伯里为你总结...

拥有不同人生经历的成功人士都有一个共同的特点:别人认为不可逾越的藩篱,他们却将其看作是要拥抱的挑战和要克服的阻碍物。障碍物本身并不会阻挡你的路,因为它们本身就是路。畅销书《情商2.0》的作者之一特拉维斯·布拉德伯里为你总结成功人士不同的思考方式。

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

线路板稳压电源的选择

电子设计技术 1995年第8期 19-20+22-23+25-31页

作者： Bill travis

在电路板系统选用分布式电源时需要考虑诸多的因素,这些因素包括成本、实际空间的约束、散热问题、电磁辐射和射频干扰以及稳压器的性能等。

关键词：稳压器模块型稳定电源电源转换器线路板电路板

Spatial distribution of leprosy in India:an ecological study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2018年第1期7卷 206-214页

作者： Kyra H.Grantz Winnie Chabaari Ramolotja Kagiso Samuel Buri Gershom Laura Blum Lee Worden Sarah Ackley Fengchen Liu Thomas M.Lietman Alison P.Galvani Lalitha Prajna travis C.Porco Department of Biology University of FloridaGainesvilleFLUSA Emerging Pathogens Institute University of FloridaGainesvilleFLUSA DST/NRF Center for Excellence in Epidemiological Modeling and Analysis(SACEMA) StellenboschSouth Africa Stellenbosch University StellenboschSouth Africa African Institute of Mathematical Sciences MuizenbergSouth Africa University of California BerkeleyCAUSA Francis I.Proctor Foundation for Research in Ophthalmology University of CaliforniaSan FranciscoCAUSA Department of Ophthalmology University of CaliforniaSan FranciscoCAUSA Department of Epidemiology and Biostatistics University of CaliforniaSan FranciscoCAUSA Yale University New HavenCTUSA Aravind Eye Hospital MaduraiTamil NaduIndia

Background:As leprosy elimination becomes an increasingly realistic goal,it is essential to determine the factors that contribute to its *** evaluate social and economic factors as predictors of leprosy annual new case detection rates within India,where the majority of leprosy cases ***:We used correlation and linear mixed effect regressions to assess whether poverty,illiteracy,nighttime satellite radiance(an index of development),and other covariates can explain district-wise annual new case detection rate and Grade 2 disability ***:We find only weak evidence of an association between poverty and annual new case detection rates at the district level,though illiteracy and satellite radiance are statistically significant predictors of leprosy at the district *** find no evidence of rapid decline over the period 2008-2015 in either new case detection or new Grade 2 ***:Our findings suggest a somewhat higher rate of leprosy detection,on average,in poorer districts;the overall effect is *** divide between leprosy case detection and true incidence of clinical leprosy complicates these results,particularly given that the detection rate is likely disproportionately lower in impoverished *** information is needed to distinguish the determinants of leprosy case detection and transmission during the elimination epoch.

关键词： Leprosy Hansen’s disease India Poverty Spatial

在线全文

学校读者我要写书评

暂无评论

大型微处理器的供电问题

电子设计技术 1998年第2期 36+38+41-42+44+46-47页

作者： Bill travis

驱动大型微处理器(μP)是一件相当棘手的事,尤其是它的电源设计,必须做到在严格控制电压电平的情况下,能提供十几甚至几十安培的电流,并且还要求对重负载的瞬时变化作出快速响应。

关键词：微处理器非同步调节器充电泵位同步控制器码元同步 MOSFET

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

测试电源的输入瞬变和负载瞬变

电子设计应用 2004年第12期 112-114,116-4+9页

作者： travis Eichhorn Maxim公司

电源的输入瞬变和负载瞬变是表示电源对供电电源和负载电流产生突变的响应能力。电源的输出响应能够反应出电源对于因输入和负载跃变而产生的各种频率谐波的衰减能力。

关键词：电源 MOSFET 瞬变

在线全文

学校读者我要写书评

暂无评论

温度管理IC—防止系统“熔”坏的卫士

电子设计技术 1997年第1期 26+28+30-34页

作者： Bill travis

超温报警、截断故障电路,以及启动热反馈环路校正功能,这都是温度传感器开关集成电路防止系统出现灾难性故障的方法。

关键词：温度传感器器件温度管理数字输出 IC

Anatomically realistic multiscale models of normal and abnormal gastrointestinal electrical activity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第9期13卷 1378-1383页

作者： Leo K Cheng Rie Komuro travis M Austin Martin L Buist Andrew J Pullan Bioengineering Institute The University of Auckland Private Bag 92019 Auckland 1142 New Zealand Division of Bioengineering National University of SingaporeSingapore Bioengineering Institute The University of Auckland Private Bag 92019 Auckland 1142 New ZealandDepartment of Engineering Science The University of Auckland

One of the major aims of the International Union of Physiological Sciences (IUPS) Physiome Project is to develop multiscale mathematical and computer models that can be used to help understand human health. We present here a small facet of this broad plan that applies to the gastrointestinal system. Specifically, we present an anatomically and physiologically based modelling framework that is capable of simulating normal and pathological electrical activity within the stomach and small intestine. The continuum models used within this framework have been created using anatomical information derived from common medical imaging modalities and data from the Visible Human Project. These models explicitly incorporate the various smooth muscle layers and networks of interstitial cells of Cajal (ICC) that are known to exist within the walls of the stomach and small bowel. Electrical activity within individual ICCs and smooth muscle cells is simulated using a previously published simplified representation of the cell level electrical activity. This simulated cell level activity is incorporated into a bidomain representation of the tissue, allowing electrical activity of the entire stomach or intestine to be simulated in the anatomically derived models. This electrical modelling framework successfully replicates many of the qualitative features of the slow wave activity within the stomach and intestine and has also been used to investigate activity associated with functional uncoupling of the stomach.

关键词：胃肠电活动正常活动异常活动实际解剖多尺度模型