The hydrothermal wave of large-Prandtl-number fluid in a shallow cavity

The hydrothermal wave was investigated numerically for large-Prandtl-number fluid (Pr = 105.6) in a shallow cavity with different heated sidewalls. The traveling wave appears and propagates in the direction opposite to the surface flow (upstream) in the case of zero gravity when the applied temperature difference grows and over the critical value. The phase relationships of the disturbed velocity,temperature and pressure demonstrate that the traveling wave is driven by the disturbed tem-perature,which is named hydrothermal wave. The hydrothermal wave is so weak that the oscillatory flow field and temperature distribution can hardly be observed in the liquid layer. The exciting mechanism of hydrothermal wave is analyzed and discussed in the present paper.

猪苓菌丝体多糖对小鼠免疫水平的影响

通过人工液体浅层培养方式培养猪苓菌丝体,用热水浸提法提取猪苓菌丝体多糖(PPS1),经纯化测定其糖含量,用红外光谱分析鉴定多糖;纯化鉴定的PPS1,通过小鼠进行腹腔单核巨噬细胞功能测定试验、E玫瑰花环试验、足跖肿胀厚度试验、淋巴细胞转化试验、EAC花环试验等5项免疫学试验初步探讨其免疫药理学作用,同时与猪苓菌核多糖(PPS2)进行比较。试验数据经统计学分析显示,E玫瑰花环试验中PPS1与空白对照组相比差异显著(P<0.05);腹腔单核巨噬细胞功能测定试验、足跖肿胀厚度试验、淋巴细胞转化试验及EAC花环试验PPS1与空白对照组相比差异极显著(P<0.01);5项免疫学试验PPS1与PPS2相比差异均不显著。结果表明,PPS1能明显提高小鼠的免疫功能。

斜板浓密机浅层内单矿物泥浆沉降规律

研究了石英砂湿磨矿浆的实验室静态沉降和斜板 单元动态沉降过程，揭示了两 种沉降的内在规律、相互关系、差异及其机理，为斜板浓密机的应用试验及工程设计提供了相应的理论依据。

浅耕层耕地改良利用效果探讨

进行加深耕层3cm和6cm、施用绿肥、施用农家肥、配方施肥的试验,为改良利用浅耕层稻田提供理论依据。田间试验表明,配方施肥、施用绿肥、施用农家肥、精耕细作在增加水稻产量的同时,也促进了土壤熟化、不同程度地增加了浅耕层稻田的耕作层厚度;深耕3cm和6cm对土壤PH值、有机质、全氮的影响不大,但土壤速效磷稍有下降,而速效钾略为增加;深耕3cm和6cm对水稻产量有较大影响,在第一到第四年里,水稻产量逐年增加,且深耕幅度大最终增产幅度也大。建议逐年加深耕作层,增加施肥量。