河北省贯彻落实农药经营许可制度的实践与探索

农药经营环节是整个农药管理链条当中极其重要的一环,是连接农药生产与使用的桥梁和纽带。为更好地落实农药经营许可相关制度,便于操作,河北省制定了配套的规范性文件,并在工作实践中不断探索完善,进一步完善审查审批流程,以解决实际问题,有效推进了全省农药经营许可制度的落实。     

Tuberculosis in alpaca (Lama pacos) on a farm in Ireland. 1. A clinical report

This case report describes tuberculosis (TB) due to infection with Mycobacterium bovis (M. bovis) in alpaca (Lama pacos) on a farm in Ireland. Two severely debilitated alpaca were presented to the University Veterinary Hospital, University College Dublin in November 2004. Bloods were taken, and haematology and biochemistry results were indicative of chronic infection. Radiological examination showed evidence of diffuse granulomatous pneumonia suggestive of tuberculosis. On necropsy there were granulomatous lesions present throughout many body organs including lung, liver, kidney, intestine as well on peritoneum and mesentery. Culture of acid-fast bacilli from lesions led to a diagnosis of tuberculosis due to M. bovis. The use of intradermal skin testing proved inefficient and unreliable for ante mortem diagnosis of tuberculosis in alpaca. Infection due to M. bovis should be considered among the differential diagnoses of debilitating diseases in alpaca, particularly those farmed in areas known to be traditional black spots for tuberculosis in cattle.     

Judgement of hygienic quality of roughage in horse stables in Switzerland

In 46 horse farms all over Switzerland, the hygienic quality of the roughage (including silages) was investigated. Therefore, a macroscopic examination as well as the microbial counts (bacteria, yeasts and moulds) was carried out. Further, the contents of lipopolysaccharides (LPS) and the contamination with deoxynivalenol (DON) were determined. In all roughages, the dry matter (DM) content was measured and in silages additionally the pH was measured. Predominantly, the straw showed a lower hygienic quality than hay and silages. The LPS contents were significantly higher in straw than those in hay samples. The macroscopic examination and the microbial counts showed a tendency in the same direction. Eight straw samples and one hay sample with DON contamination were found. The silages showed a DM content with a median of 65.8%. The pH of those silages was between 4.3 and 5.9. Despite the high values of DM and pH, the silages showed mainly a high hygienic quality. In total, the hygienic standard of straw was worse than that of hay. This should be taken into account also in straw used as bedding as much as the hygienic quality of hay.     

针阔混交防护林可持续经营技术研究

系统分析了浙江省建德市新安江林场针阔混交林的主要森林类型及其发生、发展和演替规律。根据当前防护林经营中存在的问题,按照可持续经营的原则,提出了马尾松阔叶树混交林的择伐经营模型。现实森林类型在如何实现择伐经营,发挥防护林的综合效益方面,文章论证了防护林经营技术上所涉及的森林作业和森林经理方法。     

浅议科技论文的审读

审读是科技期刊出版的首要工作。对科技论文的审读包括形式审查和内容审查,除了要界定投稿范围。核实符合版权、保密、专利要求,确定文章体裁外,还要从政治思想性、专业水平、文字表达等到方面予以综合评鉴,重点审查新颖性、科学性、真实性、实效性等。     

面向从江香猪选育的肌内脂肪活体超声无损测定

为探索从江香猪肌内脂肪含量的超声活体预测方法,该文选取110头从江香猪育肥猪开展活体测定,以超声图像为研究对象,利用Matlab R2015b软件提取灰度-梯度共生矩阵(gray gradient cooccurrence matrix,GGCM)及4个角度灰度共生矩阵(gray level cooccurrence matrix,GLCM)图像纹理特征参数。通过逐步回归分析法构建肌内脂肪(intramuscular fat,IMF)含量预测模型,再将此模型应用于另外42头从江香猪,验证模型准确性。逐步回归分析结果表明,背膘厚、灰度平均和梯度熵3个参数指标达到显著水平(P0.05),回归预测模型决定系数R2=0.369。线性回归及相关分析得出,估测值与实测值间RMSE为0.686,皮尔逊积矩相关系数(pearson correlation coefficients)和斯皮尔曼相关系数(spearman correlation coefficients)分别为0.592和0.640(P0.001)。该研究所构建的拟合回归模型可应用于从江香猪肌内脂肪活体预测,为后期高肌内脂肪含量从江香猪的选育提供更为便捷有效的手段。     

鸡蛋新鲜度综合无损检测模型及试验

为了提高鸡蛋新鲜度无损检测的准确性,该文用反映鸡蛋内部颜色的计算机图像参数和鸡蛋敲击响应特性参数构成鸡蛋新鲜度综合无损检测模型,利用两种检测方法之间的参数进行相互补偿和修正。用机器视觉装置获取鸡蛋颜色的亮度、蛋形指数,用声音采集装置获取声音的功率谱面积、共振峰频率、X轴方向的质心,通过试验测得对应鸡蛋的新鲜度（哈夫单位）。以它们为样本数据建立多元线性回归模型,获取鸡蛋新鲜度与其图像特征参数和声音特征参数之间的最优关系。经检验,所建模型判别鸡蛋新鲜度的正确率为92%。     

一种基于直线模型的AGV视觉导航

在自动引导试验车组成和工作原理的基础上,根据实际路况,提出了一种简洁、准确的边缘提取方法和道路标识线的控制方法,对系统的稳定性、精确性进行了改进,试验结果表明,该系统模型受外界环境的影响很小,在自主状态下能稳定而精确的跟踪标识线,达到了预期效果.