首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 93 毫秒
1.
选用杯碟琼脂扩散法和染菌动物药物治疗法,验证和评价新兽药百病特灵可溶性粉对鸡大肠杆菌的体外抗菌的体外抗菌效能和雏鸡大肠杆菌病的疗铲,结果证实,本药对此菌的抑菌圈直径均值,比对照药盐酸恩诺沙星大1.16倍;饮服百病特灵可溶性粉水溶液的最适治疗浓度为30~6mg.L^-1,每天2次,给鸡饮服,连用3~5d,对此病的治愈率均达100%,相对增重率分别为138.98%~180.63%。比阳性对照组鸡死亡率  相似文献   

2.
1993-1994年经多点试验示范,结果表明:应用HF-Ⅰ号拌种可使大豆株高增加14.2%,根数增加20.7%,根瘤数增加119%,地上部鲜重增加43.7%。单株黄数、株粒数分别增加3.3%和5.9%,较对照亩增产32.7kg,增产率24.3%,达显著水。并且对大豆根潜蝇和根腐病防效达67%和77%。产投比达22:1。  相似文献   

3.
卫星名称所属国家或组织发射时间轨道位置电星-6美国2月15.22日267°E日本通信卫星-6日本2月16.07日120°E阿拉伯卫星-3A阿拉伯卫星组织2月26.95日26°E彩虹1-4俄罗斯2月28.17日34°~35°E亚洲卫星-3S亚洲卫星公司3月21.01日105.5°E印度卫星-2E印度4月2.92日83°E欧洲通信卫星-W3欧洲通信卫星组织4月12.95日7°E联合卫星-1加拿大5月20.94日269°E阿斯特拉卫星-1H卢森堡6月18.08日19.2°E    注:5月5日发射的美…  相似文献   

4.
选用胎次、分娩日期、产活仔数和初生重相近杜长大哺乳仔猪36窝,334头,随机分为3组,两个试验组分别口服0.5%,和0.8%的稀盐酸,对照不补稀盐酸。其结果,两试验组仔猪黄白痢的发病率分别比对照组降低了17.86、19.48个百分点,死亡率分别降低9.82、10.68个百分点;试验前期(0~20日龄)日增重分别比对照组高9.65%、14.21%,试验全期(0~35日龄)分别高10.64%、15.4  相似文献   

5.
30头中国瘦肉猪新品系DⅢ系和DⅢ-Ⅰ系经产母猪,平均胎次4.67胎,平均产后体重206kg,平均带仔数为12.5头,依据品种,胎次、产活仔数等相一致的原则,随机分为5个组增重研究了5种蛋白水平分别为11.5%、13.8%、15.9%、18.0%和20.2%,相应的赖氨酸为0.61%、0.74%、0.87%、1.0%和1.12%的5种等能饲粮对母猪泌乳行为、泌乳量和乳成分的影响。结果表明,饲粮蛋白  相似文献   

6.
以原湖北白猪Ⅱ、Ⅴ、Ⅵ系为基础,经过一系列的杂交组合试验,筛选出15、16两个组合,经与杜洛克公猪预杂交,16品系的配合力最强。在此基础上,进行了湖北白猪合成新品系的基础群组建与选育。16组合75日龄—90千克体重的平均日增重为762克,达90千克体重的日龄为156.1天,增重千克消耗配合料为3.01千克,与原Ⅱ、Ⅴ、Ⅵ系及25、26、21组合比,差异极显著(P<0.01),日增重也优于15组合,屠宰测定16组合胴体瘦肉率达64.83%,与同期测试的Ⅱ、Ⅴ、Ⅵ系及25、26、21组合相比差异极显著(P<0.01)。与杜洛克配套进行预杂交“杜16”日增重,达90千克日龄,饲料转化率都明显优于原杜湖猪(P<0.05),也优于15组合,屠宰测定胴体瘦肉率达到了67.5%,比原杜湖猪提高了3个百分点以上。新的合成系基础群建有7个血统,10头公猪,62头母猪。2~6月龄平均日增重,公猪739克,母猪641克。部分猪同胞和半同胞在空腹重98.9千克屠宰测定胴体瘦肉率为64.9%。  相似文献   

7.
选用莱芜猪经产母猪所产“大莱”二元杂交仔猪共50窝,按35日龄断奶20窝、45日龄20窝、60日龄断奶10窝,分设为Ⅰ、Ⅱ、Ⅲ组,Ⅰ、Ⅱ组仔猪断奶后养至60日龄,然后三组比较对仔猪生产性能的影响。结果,Ⅰ组60日龄平均窝重213.98千克,个体重20.38千克,日增重340克,成活率95.5%;Ⅱ组60日龄时平均窝重196.9千克,个体重18.97千克,日增重316克,成活率92.5%;Ⅲ组60日龄平均窝重179.85千克,个体重16.67千克,日增重278克,成活率90.6%。日增重Ⅰ组比Ⅱ组多24克(P<0.05),比Ⅲ组多62克(P<0.01)。仔猪纯收入Ⅰ组比Ⅱ组、Ⅲ组高3.75元、14.59元。  相似文献   

8.
在0.5mol/LHClO4介质中,采用氟离子选择性电极测定了尿结石中的微量氟。校正空白值后,F^-的线性范围为1.00×10^-2-4.79×10^-7mol/L。本法的相对标准偏差和回收率分别为0.75%和101.1%。六例尿结石的氟含量为2643±2104μg/g,这表明氟化物对尿结石的形成有促进作用。  相似文献   

9.
采用离子选择性电极技术分析了15种牌号过滤嘴香烟烟雾中氟化氢的含量。所分析的香烟,在带过滤嘴和去除过滤嘴情况下,其烟雾含氟量(X↑-±S)分别为0.236±0.131μg/支(或0.280±0.138μg/g)和0.431±0.167μg/支(或0.517±0.178μg/g)。利用本法分析烟雾的相对标准偏差和回收率(X↑-±S)分别为3.1%(n=6)和98.1±5.7%(n=5)。结果表明,香  相似文献   

10.
以东北红豆杉(Taxuscuspidata)的不同外植体进行愈伤组织诱导、继代和再分化培养,结果发现在MS培养基上,幼叶的出愈率最高,达783%,在B5培养基上,幼基的出愈率最高,达760%。诱导愈伤组织最适2,4-D浓度为2-3mg·L-1。经抗氧化剂处理,愈伤组织在改良MS培养基上经多次继代培养,褐化现象减轻或消失,生长速率最高可达0090g·kg-1·d-1(鲜重)。在分化培养基上,由愈伤组织诱导出绿芽点。  相似文献   

11.
Crop yield has been predicted using environmental, land, water, and crop characteristics in a prospective research design. When it comes to predicting crop production, there are a number of factors to consider, including weather conditions, soil qualities, water levels and the location of the farm. A broad variety of algorithms based on deep learning are used to extract useful crops for forecasting. The combination of data mining and deep learning creates a whole crop yield prediction system that is able to connect raw data to predicted crop yields. The suggested study uses a Discrete Deep belief network with Visual Geometry Group (VGG) Net classification method over the tweak chick swarm optimization approach to estimate agricultural production. The Network’s successively stacked layers were fed the data parameters. Based on the input parameters, a crop production prediction environment is constructed using the network architecture. Using the tweak chick swarm optimization technique, the best characteristics of input data are preprocessed, and the optimal output is used as input for the classification process. Discrete Deep belief network with the Visual Geometry Group Net classifier is used to classify the data and forecast agricultural production. The suggested model correctly predicts crop output with 97 percent accuracy, exceeding existing models by maintaining the baseline data distribution.  相似文献   

12.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

13.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

14.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

15.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

16.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

17.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号