用插值法计算混合气体放电参数的适用条件及判据

阐述了气体放电的基本物理参数、群集参数和临界放电场强间的关系，并分析了用插值法计算混合气体放电参数的条件．提出了一个简单判据，可以检验插值法是否适用于某一混合气体的电子碰撞电离系数和电子附着系数的计算．实验表明，只要这一判据得到近似满足，就可以在临界放电场强的计算中取得满意的结果     

声参量混合定则预测生物组织组分的研究

从理想混合液模型出发，将生物组织看作是主要由水、脂肪、蛋白质所构成的三元理想系统．测量了蛋白、蛋黄及其混合物的声速、密度和非线性声参量Ｂ／Ａ，并根据修正后的Ａｐｆｅｌ混合定则，对该混合物进行水分、脂肪和蛋白质体积含量预测．结果表明，实测体积含量与Ａｐｆｅｌ混合定则预测值吻合较好     

几种SF6混合气体的耐电强度及分析

在Ｅ／Ｐ值为１５．０～９４．０ｋｖ（ｍｍ．ＭＰａ）范围内采用稳态汤逊法（ＳＳＴ）测量了ＳＦ６／Ｎ２，ＳＦ６／ＳＯ２，ＳＦ６／Ｈｅ，ＳＦ６／Ｎｅ，ＳＦ６／Ａｒ，ＳＦ６／Ｋｒ，ＳＦ６／Ｘｅ等混合气体的电子崩电流，确定了电离系数α吸附系数η和有效电离系数α，用最小二乘法求出了α／Ｐ与Ｅ／Ｐ值的关系，给出了在各混合比下这些混合气体的临界耐电强度值（Ｅ／Ｐ）ｌｉｍ并分析和比较了这些混合气体的绝缘特性。     

RKS状态方程用于混合致冷剂热力性质的计算

应用 Redlich-Kwong-Soave 状态方程对非共沸混合工质 R22/R114、R13B1/R152a 的热力性质及汽液平衡进行了计算,同时还计算了两种共沸混合工质 R500和 R502。与实验数据的比较表明,汽液平衡、饱和压力和非共沸混合工质的饱和容积都获得了令人满意的结果。此外还为上述四种混合工质确定了交互作用系数。     

安庆市实施液化气混空气供气有关问题的探讨

通过分析安庆市在实施液化气混空气供气条件的基础上,讨论了相关的实施设备、技术问题等.     

菌糠复合剂对不结球白菜生长发育及产量的影响

为确定菌糠复合剂对不结球白菜生长发育及产量的影响,采用盆栽试验的方法,施用不同的菌糠复合剂,定期测定了3茬不结球白菜的株高、根长、叶片数及产量。结果表明:菌糠复合剂可以促进不结球白菜生长、增加产量。其中,以含有链霉菌(Streptomycessp.)和巨大芽孢杆菌(Bacillus megatherium)的微生物组合1 菌糠处理的效果最好。     

Climate as the dominant control on C<Subscript>3</Subscript> and C<Subscript>4</Subscript> plant abundance in the Loess Plateau: Organic carbon isotope evidence from the last glacial-interglacial loess-soil sequences

Two modes of photosynthesis predominate in terres-REPORTS trial plants: the C3 and C4 modes[1]. The C3 mode is used by all of trees, bushes, and cold season grasses. The C4 mode is used by the most of tropical and warm season grasses. They are disadvantaged relative to C3 plants at high CO2/O2 ratios because of the additional energy ex-pense needed to concentrate CO2 in the bundle-sheath cells. At low CO2/O2, however, C4 plants can achieve a relatively high quantum yield by suppressin…     

Change in the sedimentary environment of Wanquan River Estuary,Hainan Island,China

Pb geochronology and sediment core profiles of organic carbon, total sulfur and organic carbon isotope (d 13C) values were used to reconstruct the local environ-mental history of the Shamei Lagoon, located in the Wan-quan River Estuary, eastern Hainan Island, China. Totalsulfur and d 13C values decreased upwards in the top 30 cm of a sediment core that spanned the last 200 years of deposi-tion. Total sulfur concentration and d 13C values respectively decreased upward from 1.92% to 0.36%, and -20.63?to -23.64? The C/S ratio in the 19th century and earlier was relatively stable in the range of 0.47—0.80, and there was a positive correlation between organic carbon and total sulfur. Since around 1900 AD, the C/S ratio increased rapidly to a maximum of 3.94, but no simple correlation was found be-tween organic carbon and total sulfur during this more re-cent period. These results indicated that before 1800 AD, the lagoon had a fully marine character, and the location of to-day抯 Wanquan River Estuary was an open embayment.From 1800 to 1900, the salinity of Shamei Lagoon decreased noticeably. The amount of seawater which could enter thelagoon decreased gradually as the Yudai spit grew. Today,seawater scarcely affects the lagoon; it is essentially a fresh-water basin.     

基于背景差的码头运动船只检测

通过背景差法对码头视频图像中的运动船只检测。采用混合高斯模型为码头背景建模,该模型可克服各种外部因素的影响,如光照变化、阴影、目标遮挡等,具有很强的适应能力。对采用全局固定阈值进行运动目标分割的方法作了优化,并对运动船只目标进行分割。经现场测试,能有效地监测运动船只、记录异常事件以及视频图像的提取和过滤,提高了码头监管的质量和效率,可广泛应用于码头无人监控。     

基于局部二元图的视频对象阴影检测方法

针对在视频对象分割时,运动投影常被误分为视频对象,给出一种新的视频阴影检测方法,该算法基于在灰度图像中阴影区域和背景相应位置具有相同纹理这一事实,其中利用自适应高斯混合模型进行背景建模,利用局部二元图(local binary patterns,LBP)来表征纹理。首先,进行基于自适应高斯混合模型的背景提取,获得包含运动投影的前景分割,分割时加入了LBP纹理相似性判断,减少了分割出的目标内的孔洞提高了分割的精确度。然后利用阴影区域和已获取背景相应位置的LBP纹理相似性,可较好的对视频阴影进行检测。通过实验,获得了不错的阴影检测实验结果,可较好地应用于运动目标检测分割及跟踪等领域。