Time of foaling in Arabian mares raised in Tiaret, Algeria

Objective:To enhance effectiveness of reproduction management in Arabian mares,factorsinfluencing the time of foaling were investigated in this study.Methods:Data were collectedat the National Haras of Tiaret in Algeria from 2003 to 2010.The foaling time of 255 Arabian purebred mares,aged from 3 to 20 years were used for this study.Results:A total of 78.07%of foalinghappens between 7 pm and 6 am.Conclusions:The influence of the month of foaling and the sexof the foal,on the time of foaling was statically significant.

流体动力在线自动除垢及其传热强化技术的初步开发

从宏观角度简略地概述了传热设备污垢的危害性。提出了开发污垢清洗技术的理想化原则,介绍了开发兼具污垢清洗与传热强化双重功能的新技术的初步工作。