混凝土楼板的裂缝原因分析及其防治处理

从混凝土构件裂缝产生的机理入手，通过分析混凝土楼板裂缝产生的原因，认为混凝土的收缩应力，温差应力及本身所受荷载应力是产生裂缝的主要原因，并提出了相应的防治处理措施。     

加气混凝土砌块墙体抹灰开裂的原因分析

通过两则工程实例 ,对比分析了因砌块生产过程及施工方法不当、砂浆强度不当、构造不合理和施工人员不懂规范等原因 ,所引起的加气混凝土砌块墙体常出现的抹灰开裂问题 ,有针对性的从材料、工序、抹灰、养护等施工工艺方面提出了相应的预防措施     

玻璃布增强PC复合材料分层裂纹的扩展行为

利用光学显微镜原位研究在Ⅰ型动态加载下玻璃布增强ＰＣ复合材料层板的分层断裂过程及其微观机理．结果表明，分层损伤微裂纹易萌生在平行于裂纹扩展方向的纱线束和交织面内．在层板边缘，主裂纹可沿经纱的方向穿过经纱和纬纱的交织面向前扩展，造成织物分隔．随裂纹张开位移的增大，纬纱才回到原织物平面内．     

概率积分法参数与地质采矿条件之间关系的研究

本文依据阜新、北票、本溪矿区岩层与地表移动实测资料综合分析的成果,对概率积分法参数与地质采矿条件之间的关系进行了较深入研究.所得结果对地表移动与变形预计参数的选择具有一定的指导意义.     

Radio wave propagation effects produced by chemical releases in the ionosphere

As an effective means to actively modify the ionosphere,chemical release can produce artificial ionospheric holes as a consequence of ionization depletion,which can greatly impact on radio wave propagation.In this paper,on the basis of the pre-study results on ionospheric disturbances produced by some representative chemical releases,the radio waves propagation effects of ionospheric holes that are produced by two different release species,water(H2O) and sulfur hexafluoride(SF6),had been investigated and simulated by the three-dimensional(3-D) numerical ray tracing.The results show that ① the appearance of various artificial ionospheric holes can lead to certain decrease of critical frequency in the ionosphere,and ② when the wave frequency exceeds the critical frequency,the rays should be multiple reflections or penetrate through the ionospheric hole and focus afterwards with the focus altitude elevated for higher frequencies.This work may provide the necessary theoretical support for chemical release experiments and the evaluation of radio wave propagation effects.     

草毒无病毒苗快速繁殖技术研究──幼嫩茎叶切块组织培养法

对幼嫩茎叶切块组织培养进行了研究，开创了利用草莓葡匐茎叶切块组织经愈伤组织获得无病毒再生植株的新方法。经实践应用，此方法一般可以每月１：１０左右的增殖倍数进行增殖。已生产出了大批试管苗移入田间。为工厂化快速繁殖无病毒草莓苗奠定了良好的基础。     

Application of wavelet transform in runoff sequence analysis

A wavelet transform is applied to runoff analysis to obtain the composition of the runoff sequence and to forecast future runoff. An observed runoff sequence is firstly decomposed and reconstructed by wavelet transform and its expanding tendency is derived. Then, the runoff sequence is forecasted by the back propagation artificial neural networks (BPANN) and by a wavelet transform combined with BPANN. The earlier researches seldom involve the problem of how to choose wavelet function, which is important and cannot be ignored when the wavelet transform is used. With application of the developed approach to the analysis of runoff sequence, several kinds of wavelet functions have been tested.     

知母的组织培养和快速繁殖

本文研究了知母的组织培养条件,利用叶片诱导出了愈伤组织,并分化出大量再生植株,同时进行了盆栽试验,移栽成活率达95％以上。     

翘嘴红鲌人工繁殖技术研究

于2002～2003年,在浙江湖州,对翘嘴红鲌亲鱼的选择、运输、培育及苗种的人工繁殖技术进行了研究.结果表明,亲鱼培育要以鱼或虾为饲料,繁殖年龄应3足龄以上,规格以0.75～2.5 kg/尾为好.浙北地区的繁殖时间为6月上中旬,繁殖水温20℃以上,雌雄亲鱼的比例控制在1:1～2:1之间,适宜催产剂为HCG LRH-A.采用一次注射,在环道内自然产卵、孵化的方式为宜.繁殖用水要严防浮游动物的进入,出苗时应带水操作.     

用于图像分割的局部区域能量最小化算法

针对点对马尔可夫随机场(Pairwise MRF)模型中像素成对交互的结构不能充分描述图像丰富的局部统计特征问题,在研究Pairwise MRF模型基础上,提出了一种基于局部区域能量最小化的图像分割算法.该算法先利用图像局部区域信息构造局部区域能量模型,建立了一种局部交互的区域马尔可夫随机场分割模型,然后采用无环置信传播(LBP)算法对MRF全局能量进行优化.优化过程中,对局部区域能量进行收敛并按照MAP准则估计局部区域标号,通过LBP算法把局部区域信息传递到邻域区域中去.实验结果表明,所提出的新算法较标准LBP算法具有更好的分割结果,并有效地抑制了图像噪声信号和纹理信号对分割结果的干扰和影响.