Auto detection of wood texture orientation by Radon transform

A novel and efficient approach for detecting wood texture orientation by computer was presented. Four Matlab functions were tried to describe the relative position and orientation of wood texture pixels, to detect texture shape and to create skeletal lines image of wood texture, and BWMORPH function was found the best one. Then by Radon transform, it generated a signature composed of 180 values,each value summing up the size of texture lines that are shaped along that angle, and a two dimensional curve plot was drawn to represent the texture orientation of wood. Furthermore, it analyzed texture orientations of forty species as well as their general statistic laws, classified by softwood, hardwood, radial section and tangential section, and the results showed that texture orientation laws described by Radon transform plot and their extracting datum were in accord with the impression of wood texture that people possessed in daily life, which confirmed the validity of this new approach and their appealing utilization potentials.     

-蒎烯异构反应的研究

以α-蒎烯为原料探讨了在微波辐照下的异构反应,得出了影响α-蒎烯异构反应的因素主要是微波功率、催化剂用量、反应时间以及加料方式.结果表明,以偏钛酸为催化剂,用量为原料质量的1.7%,分两次加入,微波功率为800W,反应时间为110 min时,α-蒎烯的转化率及莰烯的得率分别为85.5%和82.9%,与传统工艺相比催化剂用量减少约40%,反应时间大大缩短,生产成本降低,生产能力至少增加6倍,且纯度(没有精馏)和得率比传统工艺分别提高了2.5%,经济效益明显提高,有很好的工业化应用前景.     

三次样条函数在树干材积测算中的应用

主要介绍了三次样条函数拟合树干曲线测定树干材积的方法。以水杉的实测资料作为算例，与常规的区分求积方法进行比较分析，结果表明：当采用2m区分段区分求积时，在不增加区分段数(不增加额外的外业工作量)情况下三次样条函数区分求积法，要好于中央断面积区分求积法，采用三次样条函数区分求积法测算树干材积能有效地提高求积精度，具有较好的应用价值。     

计算连续梁的新三弯矩方程

本文对含有阶梯函数、Ｄｉｒａｃ函数的简支梁挠曲线的四阶微分方程进行Ｌａｐｌａｃｅ变换，然后再进行逆变换，求出原函数，最后利用边界条件推导并建立连续梁的新三弯矩方程。     

肉狗的饲养技术

一、引种肉狗的品种应以体形大、食量少、产肉率高、肉质鲜美为佳。成年狗体重应在25千克以上;性情温和,对外界刺激反应灵敏性差,活动量少,不凶猛,宜关养,生长快。育肥狗最好采用杂交仔狗,实行圈养。二、去势公狗要及时去势,去势的最佳时期是满月后的1个月内。去势方法:向睾丸内注射0.5毫升"去势灵"。三、饲喂1.育幼将自繁或买回的小狗按大小强弱分群,每群不     

别乱给小儿服退热药

一般健康人的体温为37℃,高于37℃即为发热。幼儿大脑发育尚未完善,体温调节中枢功能薄弱,因此孩子一有病就发热,其他症状则不明显,如感冒、麻疹、肺炎、局部感染、药物反应、风湿热等。发热成了孩子有病的信号,因此,发热是诊断疾病的重要体征,如果一发热就用退热药把它压下去,