往复泵吸入特性的流体力学数值模拟

为了研究往复泵在吸入过程中流体的动力特性及相关参数对吸入特性的影响,对往复泵的吸入过程进行计算流体动力学的数值模拟。在吸入过程中,根据阿道尔夫泵阀运动微分方程和活塞运动引起的泵腔内流场变化确定泵阀的运动,同时运用动网格生成技术更新了不同曲柄转角下的计算模型。通过数值计算,得到了往复泵的瞬时吸入流量、柱塞端面上的压力分布,并研究了冲次、弹簧刚度对吸入阀迟滞关闭现象的影响。结果表明,流体的压缩性和惯性导致瞬时流量小于理论值,吸液量是理论值的0.91倍,往复泵的冲次从100/min增大到330/min时,吸入阀     

菊花加工厂废水污染调查及生物处理的初步研究

对菊花加工厂废水中的化学污染物和物理性状进行了检测，并在实验室内采用粉末炭活性污泥法对废水进行小规模处理。在实验条件下，ＢＯＤ５去除率达９３％，ＣＯＤｃｒ去除率为８７％，总氮去除率为４７％，总磷去除率为４０％〈总硬度降低５２％，出水的色度，悬浮物，ＰＨ等均达到排放标准。     

Paternity Testing of Selected Abaca （Musa textilis L. Nee） Hybrids Using Morphometric Markers

Investigation into the paternity of four abaca （Musa textilis L, Nee） hybrids was done to ascertain the mode of transmission of selected morpho-agronomic traits and to detect possible heterosis. In situ morphological characterization was undertaken using twenty five qualitative and six quantitative characters. Results revealed that a great majority of the qualitative traits were shared by both parents and their hybrids. For the rest, the qualitative traits were inherited from one or the other parent though some variant phenotypes （i.e. chimerism） were also noted in the hybrids. Cases ofheterosis were also observed and this could be exploited to increase fiber yield in the hybrids. Though inconclusive due to factors such as the heterogenous nature of abaca plants in the field and the susceptibility of morphological traits to environmental fluctuations, this study has provided baseline information on abaca hybridity that can be verified using more robust technologies as molecular markers.     

试述结合场地特征的景观设计——以山西大同“桐城怡景”为例

场地特征是场地传达出来的信息,包括空间上的自然特征和时间上的人文特征。通过分析大同"桐城怡景"景观,探讨场地特征对于设计的重要意义,并为该场地找寻出合适的设计语言。     

紫外分光光度法测定沙拉沙星可溶性粉的含量

为了快捷简便地控制沙拉沙星可溶性粉生产过程中沙拉沙星的含量，采用紫外分分光光度法测定沙拉沙星的含量，平均回收率为99．9％，RSD=0．33％，与高效液相色谱法比较结果基本一致。     

犬冠状病毒的分离鉴定及其纤突蛋白基因的克隆与序列比较

以犬胎原代细胞，采用同步接种、带毒传代和添加新细胞的方法，从１例腹泻犬脾脏和１例临床健康犬肠内容物中分离出２株犬冠状病毒（ＣＣＶＹＳ１，ＣＣＶ ＣＩ１）。该２株病毒可使ＣＲＦＫ细胞出现典型的细胞融合病变，与从美国引进的ＣＣＶＮＬ－１８参考株形成的细胞病变相似；电镜负染和超薄切片观察，分离毒株细胞培养物中均含有典型的冠状病毒粒子，并形成胞浆内包涵体；经理化学、生物学鉴定，濉有ＣＣＶ的特性；间接免疫荧     

桉树组培苗嫩梢扦插育苗专用生根粉的研究

采用两种植物生长调节剂对桉树组培苗嫩梢扦插育苗的试验表明，吲哚丁酸配制的生根粉对桉树嫩梢扦插的插条具有促进生根作用，且其Ｉ４号生根粉对各种桉树的嫩梢插条的促根作用更中明显，在试验的４种桉树无性系组培苗中，插条生根率都达到８０％以上。     

光照条件下粉末磷脂储藏稳定性初探

文章叙述了末磷酸脂在一定条件下的储藏稳定性变化规律，以过氧化值（ＰＯＶ）酸价（ＡＶ）为示踪指标，研究在常见的几种光照条件下粉末磷脂品质变化，同时，对不同光线下，不同包装形式的过氧化值和酸价作了分析测定。从实验结果看，光线是粉末磷脂不稳定的主要因素，其中荧光和紫外光对其影响较大。     

A contribution to the systematics of a piedmontese plum ecotype

Prunus domestica L., P. insititia L., P. salicina Lindl. and P. cerasifera Ehrh. are the most important species included in the plum group. Many ‘cultivars’ have an undefined origin and share very similar morpho‐phenological characteristics that make their identification difficult. This is the case of ‘Ramasin’, a group of Piedmontese genotypes whose fruits are small, ellipsoidal and very tasty. They are commonly considered as P. domestica varieties, even though on the basis of some morphological characteristics they are similar to other species such as P. insititia. In order to study the origin of this group, the DNA of 25 genotypes of ‘Ramasin’, and that of some ‘cultivars’ of P. domestica, P. insititia, P. cerasifera, P. salicina and two selections of P. spinosa L. was examined. The PCR‐RAPDs method (Random Amplified Polymorphic DNA amplified by Polymerase Chain Reaction) was used and all 69 primers that were tested generated more or less polymorphic bands. From the results of these analyses it can be supposed that the ‘Ramasin’ plums are a single genetically heterogeneous group. Moreover it can probably be assumed that ‘Ramasin’ arose from crosses between P. domestica and P. insititia.