Effects of Large Saddle Panels on the Biomechanics of the Equine Back During Rising Trot: Preliminary Results     

《Journal of Equine Veterinary Science》2017

The saddle panels, directly in contact with the horse's back, are likely an important element to optimize the fitting of the saddle, the comfort of the horse, and subsequently, the pain management in dorsalgic horses. The aim of this study was to better understand the effect of the saddle panels on the horse's back, by evaluating a prototype saddle (comfort panels: CP) compared to a standard saddle (STD). The horse's back movements were measured using inertial measurement units (IMUs) fixed at the levels of thoracic vertebrae T6, T12, T16 (under the saddle) and lumbar vertebrae L2 and L5. The centers of mass (COMs) of the horse and the rider and limb's protraction-retraction angles, pressure between saddle and horse's back, and force on the stirrups were measured using respectively 2D motion capture, pressure mat and force sensors in the stirrup leather. Three horses were trotted at the rising trot (sitting: left diagonal-rider seated; standing: right diagonal-rider standing) by the same rider. To compare saddles, linear mixed-effects regression models were used. The estimated means (SE) were calculated. During sitting phase, pressure in the cranial and middle areas of the saddle significantly increased for CP compared to STD (+0.9 (0.2) kPa and +1.0 (0.1) kPa, respectively) whereas caudal pressure decreased (−1.8 (0.4) kPa). Concurrently, the range of motion of angles T12-T16 and T16-L2 under the saddle significantly increased (+1.8 (0.2)° and +2.3 (0.3)°, respectively). The results showed that modifications of the panels' shape not only affect the pressure distribution but also the kinematics of the thoracic and lumbar regions of the equine back.  相似文献   

以球果量、雄花量等数量性状对油松优良无性系的再选择   总被引：1，自引：0，他引：1  

刘梅  安守芹  吕馨  王永红 《内蒙古林业科技》2001,(Z1):6-9

本研究对油松无性系种子园 2 2个无性系的球果量和雄球花量进行观测调查 ,并对数据进行处理。通过无性系内和无性系间的方差分析、聚类分析和秩序排序法对各无性系进行分类和排序。研究结果表明 :无性系间球果量和雄球花量的差异极显著 ,而无性系内差异不显著。并筛选出 1 61 #,6#,2 9#,63 #,78#5个球果数量大 ,占总数的 46% ,雄花量高 ,占总数的 5 7.6%的无性系为优良无性系  相似文献   

基于模糊建模的混炼胶粘度测量     

樊绍胜  王耀南 《湖南农业大学学报(自然科学版)》2004,31(3)

提出了一种在线测量混炼胶粘度的新方法．该方法以模糊建模技术为基础，综合考虑混炼过程各因素对胶料粘度的影响，建立起胶料粘度的在线测量模型．在模糊建模中，采用T-S模型描述胶料粘度变化的非线性过程，提出了一种基于相似性判别的模糊聚类算法以自动确定合适的聚类组数目，并用实数编码的遗传算法优化全局参数，从而获得了规则简化的、具有较高精度的模糊模型．根据此方法，设计了测量装置，并进行了现场试验．试验结果表明模糊模型输出与实验室测量值基本一致，平均误差较低且最大误差未超过1门尼．该方法较大地提高了橡胶混炼的生产效率，为粘度最优控制奠定了基础．  相似文献   

薄层扫描法测定人工诱生牛黄中主要成分的含量     

王芳生  赵英举  李竟成  白燕  徐礼燊  刘爱茹  张秀琴 《中国兽医学报》1989,(4)

应用岛津CS-910型薄层扫描仪测定了5份人工诱生牛黄和3份天然牛黄中胆酸(CA)、去氧胆酸(DCA)和胆红素(BR)的含量。CA和DCA用荧光扫描,λ_(ex)470nm和λ_(em)550nm;BR用可见光扫描,λ_S402nm和λ_R650nm。测定结果表明,前者中CA和DCA的含量高于后者;BR的含量则前者低于后者。  相似文献   

步进电机扭矩测量试验台系统的设计     

惠健 《农机化研究》2005,(6):154-155,158

专用电机扭矩测量仪器精度高，但价格昂贵，操作复杂，长时间使用会出现误差。步进电机扭矩测量试验台系统采用单相交流电机作负载，使用标准扭矩仪对该系统进行标定来对待测调速电机进行扭矩测量。为此，介绍了一种电机扭矩测量系统的构成与工作原理。该系统以单片机为核心，组成扭矩测量与显示系统，可以较好地实现电机扭矩在线测量，具有较好的经济效益。  相似文献   

微波电路电测及其计算方法     

付世民  房维龙 《油气储运》1994,13(4):38-42

从实际工程的角度出发，对电路电测方法进行了论述。在微通信工程中，需要获得障碍物的位置和高度，最合理的天线高度组合和障碍物绕射损耗等参数，为此论述了微波电路电测方法及技术要求。在大庆－秦皇岛输油管道通信工程中采用了Ａ，Ｂ测试法进行测试，得到高度－损耗曲线。这种曲线给出相对自由空间接收电平与收，发天线高度之间的关系。在测试所得的高度－损耗曲线与断面图相结合的基础上，由绕射损耗计算公式推出了几种常见障碍  相似文献   

散养成乳牛舍环境测定   总被引：1，自引：0，他引：1  

高腾云  史庆生 《家畜生态》1994,15(1):1-5

以一栋散养成乳牛舍为对象，系统地测定了舍内外的气温、气湿、风速、辐射强度、黑体温度及屋顶热流量。结果表明：从６月１日—９月１０日，舍内旬均气温都在２３．４３℃以上，舍内１４：００气温旬均值都在２８℃以上，舍内旬均ＴＨＩ都超过７１．７１；屋顶热流量曲线的斜率很大、峰值出现于１４：００，并且与舍外黑体温度呈高度的正相关；舍内与舍外的黑体温度、辐射强度分别呈中等以上的正相关；冬季舍内寒冷，同时受舍外气流影响大。笔者认为，通过增加牛舍高度、先用高热阻屋面材料和冬季防风可望改进此类牛舍的环境。  相似文献   

Quantitative site classification in the key county in the conversion of farmland to forests project     

Shidong Li  Guofang Shen  Mingpu Zhai  Junqing Li 《Frontiers of Forestry in China》2006,1(2):157-162

According to the requirements of the conversion of farmland to forests project (CFFP), we investigated the vegetation factors and environmental factors from more than 6,105 sub-compartments in Liangcheng County, Inner Mongolia by using the Matlab, analytic hierarchy process (AHP), and the hierarchical cluster method (HCM). The site conditions were classified quantitatively. The results show that CFFP at this site comprises five site-type groups and 19 site types. A quantitative site classification system method has been established in this paper. __________ Translated from Journal of Beijing Forestry University, 2005, 27(6) [译自: 北京林业大学学报, 2005, 27(6)]  相似文献   

家兔选育性状典型相关分析   总被引：3，自引：0，他引：3  

李岩  孙杰 《黑龙江畜牧兽医》2003,(10):14-16

选择日本大耳白和新西兰两个品种家兔的生长、繁殖、以及体尺3组共17个性状，应用多元统计方法进行了典型相关分析，结果表明；日本大耳白兔的初生重、初生窝重、21日龄重、泌乳力、胸围等5个性状，新西兰兔的产活仔数、初生重、21日龄重、泌乳力、断奶窝重、母兔体重等6个性状为主要性状。  相似文献   

Genetic mapping and utilization of quantitative trichome-mediated insect resistance in potato     

M. Bonierbale  R. Plaisted  S. Tanksley 《European journal of plant pathology / European Foundation for Plant Pathology》1992,98(Z2):211-214

Introgression of trichome-mediated insect resistance from the wild speciesSolanum berthaultii has become a major focus of the potato improvement program at Cornell University during the past twelve years. Several quantitative characters are involved in this resistance which is effective against a wide range of pest types. Correlative biochemical assays have been developed to assay specific components of the resistance, and the effects of the resistance on the target pests have been studied. Quantitative laboratory assays and specific measurements of insect behavior and biology have increased the precision of selection and enable the investigation of the genetic control of the resistance.We are currently using restriction fragment length polymorphisms (RFLPs) for genetic mapping of factors controlling the trichome traits fromS. berthaultii. Backcrosses to both the wild and the cultivated species parents have been evaluated for phenotypes contributing to the resistance mechanism, including trichome density, sucrose ester and polyphenol oxidase production by the trichomes, and the enzymatic browning reaction responsible for insect entrapment. Genetic maps are being developed for these progenies, using RFLP markers previously mapped in potato. Field and greenhouse trials under insect infestations are also being conducted with the mapping progeny. Our goal is to locate genes responsible for quantitative insect resistance by correlating RFLP variation at mapped loci with the trichome phenotypes and insect resistance. Genetic markers for these traits will be useful in transfer of the effective wild chromosomal segments into and among tetraploid potatoes, and for a better understanding of the resistance mechanism.  相似文献