变电站一次设备安全运行与故障探究

目前随着电网规模的不断扩大,变电站也进入了快速建设阶段。变电站由一次设备和二次设备组成,其中一次设备起着主要运行的目的,对变电站的安全运行有着非常重要的作用。现对变电站主要运行的一次设备及其安全运行的重要性进行了分析,并进一步对一次设备的故障原因进行了具体的阐述。     

“中國農村的社會主義高潮”序言

這是一本材料书,供在農村工作的人們看的。本來在9月间就给这本書寫好了一篇序言。到現在,過了三个月,那篇序言已經过時了,只好重新写一篇。 事情是這样的。這本书编辑了两次:一次在9月,一次在12月。在第一次     

福建三钢100吨转炉一次除尘系统半干法改造系统介绍

本文介绍了转炉一次除尘系统的概况,以及福建三钢原转炉一次除尘系统存在的问题,经过分析对比最终确定采用半干法进行对原有的转炉一次除尘系统进行改造。详细阐述了半干法一次除尘系统的系统流程、主要设备的特点及功能。     

辽宁首次公布灭绝、濒绝动物朱獾、紫貂赫然在列

这是一次艰难的寻访,跋山涉水4000公里横贯辽宁全境;这是一次刻古铭心的经历,与野生动物面对面体验胆颤心寒;这是一次权威的解读,全面提示野生动物灭绝的奥秘;这是一次活动人心的新发现,曾经公认灭绝的野生动物奇迹般地又出现了;这是一次全新的披露,辽宁灭绝野生动物名单全面解密.     

蜂蜜能治小儿尿床

我的独生小孩已四岁多了,过去总喜欢尿床,有时一个晚上多达两次。在幼儿园午睡时也尿床,为此事我们家长和幼儿园老师都大伤脑筋。去年我到省中医学院给他看过两次病,效果不佳。我看了《生活小顾问》一书说蜂蜜能治小儿尿床后,我决定试一试。令人惊奇的效果出现了,每天服两次,早上一次,晚上临睡前一次,每次服一汤匙,有条件的话也可能与牛奶同服,连续服用不要中断,服用一市斤右左即痊愈。如今我的小孩自吃了蜂蜜后,再没尿过一次床,精神也显得比过去好,晚上睡觉受惊醒的现象也没有了,过去动不动就患感冒,自吃蜂蜜以来,几个月没患过一次,现在小脸上的血色也比过去好多了。实践证明,蜂蜜不但可     

《中国实用养殖系列大全(上卷)》

是一部万众关注,同心编辑服务于社会又服务于自己,气势磅礴、个性鲜明的养殖信息技术资料大型工具书;是中华大地现有养殖动物品类的一次大普查、大集会,是养殖系列企业的一次大会师,是养殖新技术的一次大传播,是养殖系列产品的一次大展销,是养殖现状的一次大录相,是养殖发展趋势的一次大预测,是对当代养殖人物的一次大歌颂,是服务于现实又着眼于未来的可以随身携带随时提供多功能服务的中国大型养殖信息库。恰切地说,这又是一个依照民意和经济规律,在“浓缩”了的960万平方公里的大地上“修建”起来永不散场昼夜兴隆的“中国超级养殖交易大厅”。本书创造性地采用了传统的章回     

2007年下半年生猪市场分析预测

自2007年"五一"前后开始,国内各地生猪价格掀起了一轮又一轮的涨价狂潮。虽然其间受政策因素影响有过一次小幅回调,但仅维持了不到1个月,便再次强劲反弹,继续一次次刷新历史最高纪录。     

2007年下半年生猪市场分析预测

自2007年“五一”前后开始,国内各地生猪价格掀起了一轮又一轮的涨价狂潮。虽然其间受政策因素影响有过一次小幅回调,但仅维持了不到1个月,便再次强劲反弹,继续一次次刷新历史最高纪录。[第一段]     

电气一次系统

电力系统中,电气一次系统为电气系统的基本设备.本文着重将基本常用的电气一次系统的类型及工作原理做出详细介绍与阐述.同时简略介绍了电气一次系统中不常用类型.     

“中國農村的社会主義高潮”序言(一九五五年十二月二十七日)

这是一本材料書,供在農村工作的人們看的。本來在9月間就給这本書寫好了一篇序言。到現在,过了三个月,那篇序言已經过時了,只好重新寫一篇。事情是这样的。这本书編輯了兩次:一次在9月,一次在12月。在第一次編輯的時候,收集了121篇材料。这些材料所反映的情况,大多數是1955年上半年的,少數是1954年下半年的。当時,曾經將这些材料     

商会自治的基石——商会自治规范研究

在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。     

癸氧喹酯干混悬剂含量测定的改进

采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。     

猪毛色遗传的研究进展

本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air.     

不同样本商品蜂蜜中硒含量的测定

用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10～0.82μg/g。表明:蜂蜜应视为天然富硒营养品。     

乳酸杆菌益生作用机制的研究进展

乳酸杆菌作为益生菌广泛用于人和动物。本文综述了乳酸杆菌改善宿主健康的机制。乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道。文章重点讨论了乳酸杆菌表面成分（表面蛋白、脂磷壁酸和肽聚糖）与肠道受体（Ｃ型凝集素受体、Ｔｏｌｌ样受体和 Ｎｏｄ样受体）,阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制。     

Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF

Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo.     

Mechanism of Action of Probiotic Function of Lactobacilli

乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制.     

中华人民共和国农业部公告 第267号

为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …