基于机器视觉技术的淡水鱼质量分级

为了便于淡水鱼后续加工,需要对其进行大小分级,而且分级是淡水鱼加工前处理的重要工序之一。该研究收集86条淡水鱼为试验样本,利用机器视觉技术获取淡水鱼样本图像,对样本图像进行灰度化、二值化、轮廓提取等预处理,获取长短轴、投影面积等特征值。通过试验研究,建立有关鱼的头部、腹部和尾部的长度以及质量关系,运用各部分所占总质量的比例对特征值面积进行一定的校正,最后通过回归分析建立鱼体质量的预测模型。试验结果为：鱼体质量与投影面积之间是高度相关,其决定系数R2为0.9878,并对质量预测模型进行验证,验证相对误差均值为3.89%,绝对误差均值为6.81 g。试验结果表明,利用机器视觉技术可以为淡水鱼质量分级方法提供参考。     

血常规在宠物临床上的意义

以研究血常规检查在宠物临床中的意义为目的。采用血常规检查,包括定量检测结果（白细胞总数计数、白细胞分类计数、红细胞计数及指数、血小板计数及指数）、定性检测结果（血涂片形态学检查）,从而使血常规检查能为宠物临床诊断、疗效的观察及疾病的预后等提供参考。     

复合绝缘子伞裙老化状态检测的单边核磁共振传感器

对复合绝缘子伞裙老化状态的评估,关系到电力系统的安全稳定运行。为了实现在工程现场对复合绝缘子伞裙的无损检测,提出了一种便携式单边核磁共振传感器的设计方案。对静态磁场的均匀度和射频线圈进行了优化,以获得较高的信噪比。以110 kV等级下不同运行年份的绝缘子为样品进行测量,使用CPMG序列对样品进行激励;采用单指数拟合和反拉普拉斯变换对核磁共振横向弛豫回波信号进行处理。结果表明,随着复合绝缘子运行时间的增加,其等效横向弛豫时间减小。因此,这种便携式单边核磁共振传感器有望用于复合绝缘子伞裙老化程度的定量分析。     

对大学生功利主义倾向的几点思考

本文从在校大学生学习、生活等方面的表现论述了由于社会环境和校园环境的双重影响,大学生功利主义倾向的日趋严重性,并提出了要学校多部门共同协作,从根本上改变这一倾向。     

Thoracic percussion to determine the caudal lung border in healthy horses

BACKGROUND: The application of equine thoracic percussion has been ignored because of the availability of modern imaging techniques. Ultrasonography is a reliable tool in determining the caudal lung border of horses. The aim of the study was to compare percussion with ultrasonography to determine lung borders in horses. HYPOTHESIS: That thoracic percussion can detect the caudal lung border and that its accuracy is comparable with thoracic ultrasonography. ANIMALS: Fifteen randomly chosen, healthy, Warmblood horses. METHODS: The caudal lung border was detected by percussion and ultrasonography at the end of inspiration and expiration on both sides of the thorax. A reference point close to the withers was determined, allowing standardized measurements. The distance between this point and the caudal lung border in different intercostal spaces (ICS) was measured by a tape measure. RESULTS: No significant difference was found between percussional and ultrasonographic results. Greater differences were found between inspiration and expiration by ultrasonography compared with percussion in all intercostal spaces on both sides of the thorax. It was significant (P = .028) in the 12th ICS in the right hemithorax. CONCLUSIONS AND CLINICAL IMPORTANCE: Percussion is a reliable tool to determine the caudal lung border in healthy horses. Differences caused by the displacement of the lung during respiration should be taken into consideration when applying either method.     

Ophthalmic examination findings in adult pygmy goats (Capra hicus)

Objective To document normal ophthalmic findings and ocular abnormalities in captive adult pygmy goats. Animals studied Ten healthy adult pygmy goats (five male, five female; 5–11 years of age; 26–45 kg body mass) underwent complete ophthalmic examinations. Procedure Direct illumination, diffuse and slit‐beam biomicroscopy, indirect ophthalmoscopy, IOP measurements and Schirmer tear tests were performed. TonoVet^® rebound tonometry, followed by topical application of 0.5% ophthalmic proparacaine, and Tono‐Pen XL^® applanation tonometry were performed in each eye to obtain estimates of IOP. Results Ophthalmic abnormalities included corneal scars and pigmentation, incipient cataracts, lenticular sclerosis, and vitreal veiling. Mean STT values were 15.8 mm/min, with a range of 10–30 mm/min. Mean IOP values were 11.8 mmHg for TonoVet^®‐D, with a range of 9–14 mmHg; 7.9 mmHg for TonoVet^®‐P, with a range of 6–12 mmHg; and 10.8 mmHg for Tono‐Pen XL^®, with a range of 8–14 mmHg. Conclusions Ophthalmic examination findings in adult pygmy goats, including normal means and ranges for STT and IOP measurements, using applanation and rebound tonometry, are provided.     

雏鹅感染烟曲霉鉴定与病理组织学观察

为确定荣昌3个养鹅场雏鹅感染的真菌种类,本研究采集病死雏鹅肺脏病变组织样本进行病原分离,对分离的真菌进行了形态学鉴定和ITS2序列PCR扩增及测序分析。结果显示:分离的真菌菌落颜色、菌丝结构、孢子无性繁殖方式均符合烟曲霉的特征,ITS2序列与GenBank的烟曲霉AF454113、AF454114、AY660923菌株同源性均为100%。分离菌株雏鹅回归试验显示,感染雏鹅气囊有真菌结节,肺泡壁增厚,毛细血管淤血,支气管管腔有脓性纤维蛋白或粘液,肝细胞变性坏死,淋巴细胞浸润等病变。肺脏主要表现为非典型肺炎,肝脏主要表现为实质性肝炎。本研究为临床诊断曲霉病提供了实验依据。     

多路温控系统中温度检测环节的设计

本文介绍微型计算机温度控制系统中温度检测过程的几个关键问题。包括温度传感器的选择、A/D转换与零点迁移、标度变换与误差补偿，以及温度检测环节的设计方法。对温度检测环节做了进一步的优化设计，使该系统更具有实用、易行、可靠等特点，在实际应用中具有一定参考价值。     

基于执业兽医资格考试改革水产动物疾病学实践教学

从2011年开始,我国执业兽医资格考试分为兽医全科类和水生动物类两类,为了更好地适应我国执业兽医资格考试制度,培养更多合格的水生动物类兽医师,必须对兽医高等教育相关课程进行有效的改革。该文从水产动物疾病学实践课程教学改革的必要性、具体措施和取得的效果3方面进行了阐述。     

可见/近红外光谱结合遗传算法无损检测牛肉pH值

为了实现牛肉在整个货架期内(4℃环境)pH值的无损快速检测,该文采用可见/近红外光谱技术并结合遗传算法(GA,genetic algorithm),搭建了可见/近红外光谱检测系统,采集储藏在4℃下1～18d的120个牛肉样品400～1700nm范围的光谱,用不同预处理方法处理,并分别建立全波段光谱和经过遗传算法提取有效光谱的预测牛肉pH值的多元线性回归(MLR,multiple linear regression)模型、偏最小二乘回归(PLSR,partial least-squares regression)模型和最小二乘支持向量机(LS-SVM,least square-support vector machine)模型。结果表明,多元散射校正(MSC,multiplicatives catter correction)结合Savitzky-Golay(SG)平滑为最佳预处理方法,遗传算法提取光谱后所建模型的预测精度均高于全波段光谱所建模型,其中LS-SVM为最佳预测模型,其预测相关系数和标准差分别为0.935和0.111,相比全波段LS-SVM模型预测,精度得到了提高。研究表明可见/近红外光谱技术结合遗传算法所建LS-SVM预测模型能够实现4℃下牛肉整个货架期内pH值的无损快速检测。该研究为进一步开发实用的牛肉pH值无损快速检测设备提供依据。