新疆褐牛种公牛体重生长发育曲线拟合     

再娜古丽?君居列克  谈锐  黄锡霞  王雅春  热西提?阿不都热依木  努尔比亚?吾布力  程黎明  付雪峰  贾旭升  曾黎 《中国畜牧兽医》2014,41(4):211-215

为探究新疆褐牛种公牛生长发育规律,利用SAS 8.1软件中的Logistic、Gompertz、Brody和Bertallanffy 4种常用的生长曲线模型对344头次新疆褐牛种公牛体重生长曲线进行拟合。结果表明,4种模型均能较好的拟合新疆褐牛种公牛体重生长,拟合度R²分别为 0.9217、0.9263、0.9176和0.9261,其中Gompertz模型对新疆褐牛种公牛体重生长发育的拟合效果较好,Logistic、Gompertz和Bertallanffy模型生长曲线的拐点分别为(0.4937岁、502.10 kg)、(1.3168岁、379.54 kg)和(1.0477岁、311.25 kg)。本研究对实际生产具有一定的参考价值。  相似文献   

新疆库车市棉花新品种新陆中87号选育及其高产种植技术     

米吉提?努尔东 《农业工程技术:农产品加工》2022,(5)

库车市棉花种植规模较大,对地区经济发展起到了明显推动作用.新陆中87号品种具有较广适应性、较强抗逆性及优良品质等优势,能够有效加快地区棉花产业发展步伐.该文简述了新陆中87号的选育过程及品种特征,介绍了选地整地、精细播种、田间管理、病虫害防治等种植要点,以期确保新品种大面积推广应用.  相似文献   

塔里木河下游不同荒漠植被防风阻沙效应     

阿依努尔?艾尼  玉米提?哈力克  塔依尔江?艾山  买尔当?克依木  麦迪娜?穆赫塔尔 《福建林学院学报》2016,(4):480-485

以胡杨、多枝柽柳、铃铛刺和黑刺4种天然荒漠植物为研究对象,对植株单株周围风速以及输沙量的变化进行了观测。结果表明,胡杨对地表风速和输沙量的防阻作用不明显,多枝柽柳、铃铛刺和黑刺灌丛对地表风速和输沙量的影响较明显;不同灌丛的迎风面2倍树高( TH)处的风速大于迎风面1TH处风速,输沙量大小与风速大小成正比;灌丛两侧1TH处的风速与输沙量大于迎风面1TH和2TH处风速与输沙量;背风面1TH处的风速最小,背风面风速达到一定距离后渐渐恢复原来的风速;背风面输沙量1TH处最小,距离越远越大;这4种植物的防风效益依次为多枝柽柳B1>胡杨A1>多枝柽柳B2>铃铛刺C1>黑刺D1>铃铛刺C2>黑刺D2>胡杨A2。  相似文献   

Decomposition Properties of Witherite Mineral in High Temperature     

WU Cheng? bo  ZOU De? yu  ZHANG Li  XU Yuan 《保鲜与加工》2003,(1):73-76

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可否用土地承包经营权抵债     

律师同志： 　　准备举家外迁的村邻王某  欠我二千元钱  他准备把自己承包的二十亩耕地转让给我  让我承包经营  用以抵偿他欠我的钱款  不知法律是否允许? 《脱贫与致富》2001,1(2):6

律师同志： 　　准备举家外迁的村邻王某，欠我二千元钱，他准备把自己承包的二十亩耕地转让给我，让我承包经营，用以抵偿他欠我的钱款，不知法律是否允许 ?  相似文献   

An Empirical Study on the Relationship between Economic Growth and Financial Development     

RAN Mao? sheng  ZHANG Zong? yi  ZHONG Zi? min 《保鲜与加工》2003,(2):136-140

This paper discusses the relationship between financial development and economic growth. Some essential Chinese macroeconomic datum during late twenty years which include Gross Domestic Product (GDP) of the whole economy,state and private sectors,investment in fixed Assets,financial relative rate and real interest rate estimated in a multivariate vector auto regression (VAR) framework. The estimates suggest that financial development boosts GDP growth, and it does not exist in reverse.  相似文献   

Innovating Method of Mechanism Configuration Project Based on Kinematic Chain     

XIANG Cheng? xuan  HUANG Mao? lin  XU Huai? you 《保鲜与加工》2003,(2):97-103

The structure design is the most crucial and innovative one in the process of mechanism system design, and attention is constantly given to them. Although the various methods of structural synthesis are presented, more study due to faultiness of them are essential. All of available configurations of the single joint kinematic chain are gotten by replacing its pairs. On the basis of symbolization of pairs, the authors put forward the mathematic approach of permutation and combination by which all of configurations of the kinematic chain can be obtained, structure graph is used to judge the type of same fabric of the kinematic chain. Finally their application examples in engineering are given.  相似文献   

Application of the Distributed Communicative Network Based On CAN BUS     

SUN Tao  LIU Zong? hang  WU Bin 《保鲜与加工》2003,(1):69-72

In the design of the monitor and control system, the data of the individual units are exchanged frequently, at the same time, the working conditions of the system is very hard, which has strictly need for the communicative speed, communicative distance, as well as the anti disturbance. According to the actual need, the paper introduces the application of controller area network BUS for the system of the monitor and control. The actual operation has proved that the CAN BUS is fitful for monitor and control system in the communicative speed, communicative distance, the anti disturbance ability as well as the flexibility of the communicative network.  相似文献   

Application of Global Position System in Measuring Signal Frequency and the Stability of Signal Frequency     

LIU Xiao? ming  WU Sheng? yong  ZHANG Hu  LI Xin 《保鲜与加工》2003,(2):5-8

Crystals with high stability are generally adopted as benchmark in the measurement of signal's actual frequency and stability, but the requirement of high precision can not be met. Some researchers found out improved methods, but it resulted in high costs. We introduce a new method, in which we use the second pulse creating from Global Position System as benchmark and design corresponding circuits in High Density Programmable Logic Devices(HDPLD), after that, we observe the resulting signals on oscilloscope. The pulse from Global Position System is easy to get and the whole system is very cheap. As the Global Position System is based on atomic clock which is accurate and stable, the measuring precision is improved greatly.  相似文献   

An Accurate Method of the Analysis of Allowable Error for the Self-adjustable Mechanisms Without Overconstraint     

AN Pei? wen  HUANG Mao? lin 《保鲜与加工》2003,(1):1-3

Aiming at the problem of the feasibility of the supposed self adjusting displacement equation when using the present method in the analysis of allowable errors for self adjustable mechanism with the mathematic approach of rotating vector, the authors establish the self adjusting displacement equation in the cylindrical pair, and calculate the self adjusting displacement to draw out the curve of the displacement by programming. The above results show that the suppose mentioned previously is feasible. Base on the equation established, an accurate method is used to determinate the allowable error angles which can make the mechanism realize self adjustment presented. By analyzing the results of the example, the method presented is proved to be correct and effective.  相似文献