饲料中添加"富康163"养殖虹鳟试验

虹鳟鱼种全长5.7~10.7cm,体质量4.0~20.0g,在水温11℃条件下,饲养时间40d。投喂添加质量分数3%和5%“富康163”中草药复合添加剂饲料的虹鳟鱼种,平均日增重率为1.76%和2.01%,对照组为0.66%,饲料系数则比对照组分别低1.87和1.97。成活率试验池和对照池之间无显著差异。     

棉花枯萎病菌接种及粗毒素处理后棉苗维管束病理特征

 利用遗传背景一致而抗病性不同的岱16变异品系和抗病品种中12,研究了接种棉花枯萎病菌(Fusarium oxysporum f.sp.vasinfectum)及用枯萎病菌粗毒素处理后,棉苗维管束的病理变化。研究结果表明,接种枯萎病菌后,病株茎部导管及薄壁细胞中有枯萎菌丝存在。发病严重的感病品种原岱16有菌丝的导管数最多,抗病品种早熟岱16抗最少。所有品种中均出现胶状物或侵填体堵塞导管,这种现象在抗病品种中更为明显。病菌粗毒素处理后,棉苗茎及叶柄导管内也出现侵填体或胶状物堵塞导管,抗病品种茎部导管堵塞快。     

卟啉症猪肉的检疫

在检疫工作中,偶然会遇到一些少见病例,笔者有幸对铜陵县新桥镇湖城村屠宰户送检的所谓“黑骨肉”进行诊断,因其少见,特综合如下：1剖检变化屠宰户剔出肩肿骨。股骨表面及断面颜色异常,呈深棕红色,其他处骨骼颜色也是如此。该病猪的牙齿亦呈深棕红色。内脏除肝脏稍有肿胀外,其他内脏如心。肾、肺、肠道等均无明显变化,全身淋巴结大小、硬度正常。询问畜主得知病猪时有尿血现象,颈部缺乏色素,幼时牙齿咖啡色,去势较慢。2诊断依据主述病史症状,经查阅有关资料,印象诊断为猪遗传性先天性叶琳症,由于肝脏稍肿胀,特取少量肝组织及…     

杜仲叶,皮营养物质变化规律的研究

通过对杜仲叶在年生长周期中有机物质和营养元素的分析测试，表明营养物质的积累动态很有规律。但是不同海拔，不同年份以及不同品种的叶、树皮、根皮和种子的营养物质的变化有很大差异，营养物质总体含量从高到低顺序是种子、叶、根皮、树皮，光皮杜仲略优于粗皮杜仲。     

毛竹枯梢病病原菌致病机制及防治技术

毛竹枯梢病病原为竹喙球菌 Ceratosphaeria phyllostachydis Zhang。病原菌在 1 0 %毛竹煎汁蔗糖培养基 (B S) ,2 5℃ ,1 2小时明暗交替条件下培养 40～ 5 0天孢子量最多。病原菌分泌的毒素是一种还原性多糖 ,是致病的主要成分 ,在 2 0℃～ 2 5℃、振荡、连续黑暗和 p H6条件下培养 1 2天产毒最多。病害的发生与气候和竹林经营管理水平密切相关。通过实施清除病原 ,隔断侵染源、钩梢、垦复施肥、化学防治等综合防治技术 ,建立综合治理工程区 ,使病害发生面积下降了 74.7% ,消灭了严重危害区和中等危害区 ,发病率和病情指数分别下降了 88.6 %和 90 .4%。     

Prediction of crosstalk characterisation in cables bundles

Based on the heterogeneity of cable bundles and the randomness of wire spacing in cable bundles, this paper adopts the statistical theory to explore a method to predict the uneven cable bundle crosstalks. Under the assumption of electrically small and weak coupling, the mean value and standard deviation of the near end crosstalk voltage ratio are derived. 273RDSI numerical simulations are used to predict worst case crosstalk and to test the model effectiveness . The difference of the wire number and the bundles height from the ground are analyzed. The results indicate that for a given number of wires by increasing the bundle height the mean value increases, whereas the standard deviation is substantially independent of height. Moreover, the standard deviation decreases with the number of sections. By increasing the number of wires, both the mean value and the standard deviation decrease, whereas the sensitivity of the mean value to the bundle height increases.     

SBR生物脱氮机理及其影响因素

开发高效经济的生物脱氮技术一直是国内外科研工作者所关注的热点。本文介绍了SBR系统的微生物相、硝化－反硝化、亚硝化－反亚硝化生物脱氮技术及其影响因素的研究进展，并指出了当前SBR法在脱氮方面存在的问题以及发展趋势。     

Application of Revised BP -NN Method to Landslide Stability Analysis in the Three Gorges Area

Using the revised BP-NN,this paper presented the neural network method for landslide stability analysis in the Three Gorges area.By choosing 30 typical landslides in this area as examples,the stability state estimated by the revised BP-NN method is highly consistent to that by conventional transfer coefficient method.And the method presented in this paper has following advantages:the input parameters are easily obtained and this method does not deeply rely on investigation quality and shear strength parameters of slips and is a quite simple one.The BP-NN method is a new measure to stability analysis of landslides in the Three Gorges area,which is especially suitable to the stability prediction of landslides before investigation.     

凤城市耕地土壤养分状况调查与施肥建议

根据2007年风城市耕地土壤养分含量检测结果,分析了风城市耕地土壤养分资源现状。并根据土壤养分含量状况,提出控制氮肥用量、稳定磷肥用量、经济补施钾肥等合理施肥措施。