饮用水中微量氯仿检测新方法

本文在萃取-气相色谱氢焰检测法的基础上对水中微量氯仿的测定加以改进,得到了一种操作简便,且具有灵敏、准确等优点的氯仿检测方法。     

Critical heat flux of forced convective boiling in uniformly heated vertical tubes with special reference to very large length-to-diameter ratios

Over a wide range of length-to-diameter ratios l/d extending from 50 to 800, the systematic nature of the critical heat flux (CHF) in tubes is explored by analyzing CHF data upto 1051, which have recently been obtained in experiments of R-12 at 1.47 MPa for a tube diameter d = 3, 5 and 8 mm, and a mass velocity G = 510–6055 kg m⁻² s⁻¹. First, concrete evidence is obtained to show the unfitness of the expedient method substituting CHF data in tubes of low l/d values with subcooling enthalpy ΔH_i < 0 for those in tubes of very high l/d values with ΔH_i > 0. Next, the CHF data with ΔH_i > 0 are analyzed on the basis of two typical kinds of existing generalized correlations of CHF data, showing a fact that the value of CHF for tubes of diameter as small as 3 or 5 mm tends to deviate from standard values predicted by the foregoing generalized correlations based on the CHF data for l/d less than, say, 370. A tentative means to predict the above-mentioned deviation peculiar to long and narrow tubes is also obtained.     

水热法制备纳米氧化锌的影响因素研究

简单介绍了水热法的原理,主要讨论了在水热法制备纳米氧化锌的过程中,浓度、温度、反应时间、pH值、Zn2+/OH-物质的量比、添加剂和掺杂等因素对产物尺寸、形貌的影响,最后对水热法制备纳米氧化锌进行了展望。     

医学图像配准中的数据抽样方法研究

针对在基于灰度的医学图像配准中,传统数据抽样方法在过抽样时产生较多的局部极值点问题,提出了基于浮动图像灰度概率分布和其梯度信息的抽样方法.通过对人体脑部的刚体配准实验,从函数曲线和收敛性能方面,对比分析了五种数据抽样方法.实验结果表明,新抽样方法可以有效地减少局部极值点,提高归一化互信息测度的收敛性能.     

基于F-P腔的光纤光栅传感器波长移位量的检测

对构成法布里-珀罗腔(F-P腔)的光纤布喇格光栅的传输特性进行了分析,推导了F-P腔的光强透射率和反射率的解析表达式。将F-P腔内一个光纤布拉格光栅的背面贴一压电陶瓷,通过给压电陶瓷施加扫描电压使透过F-P腔的光的波长发生改变。光纤光栅受应力、应变及温度的影响时,其反射波长要发生相应变化,当探测器探测到最大光强时,根据给压电陶瓷施加的电压变化量就可确定布喇格光栅反射波长的移位量,测量精度可达到0.01 nm。     

A method of overlapping periodic compensation of atmospheric background radiation

A method of detecting heat-generating objects in atmospheric background by means of an infrared radar set with broad field of vision based on the difference in the brightness amplitudes of the radiation from a point heat-generating object and the cold atmospheric background is set forth. An algorithm of a two-dimensional spatial filter that may be implemented by a computer program in the video processor of an infrared radar set is developed.     

LIGHT SCATTERING AND INFRARED RADIATION OF SPATIAL OBJECTS

In this paper, the characteristic of light scattering and infrared radiation of spatial objects are discussed. The spectral distribution of solar, sky and earth background radiation is given. Based on theories of heat transfer, background radiation and the law of energy conservation, the thermal balance equation for spatial objects can be obtained. With the equation solved and thermal meshwork method, the variation of the thermal equilibrium temperature and radiation power with height is discussed under the conditions of different time zone and altitude.     

1，5-二（2-羟基-5-磺酸基苯）-3-氰基甲腾催化褪色光度法测定微量过氧化氢

在Britton—Robinson缓冲溶液中，Mn^2＋催化过氧化氢氧化1，5-二（2-羟基-5-磺酸基苯）-3-氰基甲[月朁]膳（DSPCF）褪色反应，褪色反应程度与过氧化氢的量在一定范围内呈线性关系，据此建立了测定过氧化氢的分光光度法。方法的线性范围是0～1．25μg／mL，表观摩尔吸光系数ε=2．3×10^4L·mol^-1·cm^-1已用于雨水中微量过氧化氢的测定，相对标准偏差为5．50％，平均加标回收率为98％。     

大豆对豆卷叶螟抗性的QTL定位

豆卷叶螟是南京地区的主要食叶性害虫。以抗性亲本溧水中子黄豆和感性亲本南农493—1杂交组合正交F2群体为材料，在田间自然虫源条件下F2单株叶片损失率为抗性指标，利用已构建的SSR分子标记图谱和Windows QTL Cartographer V2．5软件包的复合区间作图法和多区间作图法，定位大豆对豆卷叶螟抗性的QTL。结果表明：利用复合区间作图法检测到位于D1b和K连锁群上的2个QTL；利用多区间作图法则检测到位于A2、D1b、K和N连锁群上的4个QTL和6个互作QTL；其中有两个共同的QTL，至少解释表型变异的19．2％。这些结果为抗性性状的遗传剖析和标记辅助育种提供理论依据。