四氯化碳,人血白蛋白所致大鼠肝纤维化动物模型的实验研究

本文以大鼠为实验动物,对四氯化碳、人血白蛋白所致的肝纤维化动物模型,与正常大鼠从存活率,血清ＡＬＴ、ＡＳＴ、ＬＤＨ、肝组织胶原蛋白含量,肝脏病理学表现等几个方面进行了比较,各项测试与正常大鼠比较差异极为显著,均能反映出肝纤维化的形成,各项测试指标可作为实验性肝纤维化治疗研究的参考指标。     

高阶中立型微分方程非振动解的渐近性态

获得了非线性高阶中立型微分方程的非振动解具有渐近性质的充分条件。所得结果推广或改进了文献中的有关结果。     

稀土低碳白口铸铁磨球的研制与应用

本文分析了一种珠光体型白口铸铁－稀土低碳白口铸铁作为电厂磨煤机磨球材料的可行性、 讨论了它的成分与配料、熔炼控制与变质处理、铸型工艺与铸件冷却等问题。耐磨试验与工业应 用试验表明：稀土低碳白口铸铁磨球使用情况良好，在软磨料磨损条件下是优良的抗冲击磨损材料。     

Pre-and post-natal ontogeny of neutral endopeptidase 24-11 (‘enkephalinase’) studied by in vitro autoradiography in the rat

Neutral endopeptidase (NEP, enkephalinase, CALLA) which is present in various neural and non-neural tissues, is able to cleave a variety of regulatory peptides. The distribution of NEP has been studied during rat pre-and post-natal development by autoradiography after in vitro binding of the tritiated inhibitor [³H]HACBO-Gly to whole-body and organ sections. In the central nervous system (CNS), where the presence of NEP has been related to the termination of the action of enkephalins, the external layer of the olfactory bulbs is the only structure prominently labeled before birth. Other CNS structures rich in NEP in the adult, such as the nigrostriatal tract, are progressively labeled after birth. Outside the CNS, the progressive appearance of NEP in the kidney, the lungs and the salivary glands suggests its concomitant involvement in adult physiological functions, including fluid balance control, possibly by cleaving the atrial natriuretic peptide (ANP) and other peptides. On the other hand, transient or enhanced expression of NEP is observed during the development of several organs such as the sensory organs, the heart and the major blood vessels, the intestine, the bones and the genital tubercle. In addition to the still incompletely known physiological functions of the enzyme, the developmental pattern of its expression in several tissues strongly suggests a modulatory role for NEP in the ontogeny of a large number of organs.     

中立型方程振动的充分必要条件

讨论了一类一阶常系数中立型时滞微分方程的振动性,建立了此类方程一切解振动的充分必要条件,改进了近期的相应结果     

无机缓蚀剂与表面活性剂对碳钢的协同缓蚀作用

采用动电势扫描法测定了碳钢在饱和 (NH4 ) 2 CO3溶液中的阳极极化曲线 ,研究了几种无机缓蚀剂的缓蚀作用及与表面活性剂复配后的协同效应。结果表明 :当体系中添加 0 .1%的量 ,钼酸钠缓蚀性能最好 ,相对缓蚀效率达 6 8.3% ;当 0 .0 5 %的钨酸钠与 0 .0 5 %平平加复配 ,协同缓蚀效率可达 72 .7% ;应用动电势扫描法能够快速、简便地测定腐蚀速率和评选缓蚀剂。     

无限时滞中立型V积分微分方程的稳定性与有界性

以Cg空间为相空间，研究具有无限时滞中立型Volterra积分微分方程解的稳定性与有界性，得到方程解为g一致稳定，g一致渐近稳定和g有界的一些新结果．     

应用SHPB试验对活性粉末混凝土动力性能的研究

采用Hopkinson压杆对活性粉末混凝土动力性能进行了研究.分别对有约束和无约束的素活性粉末混凝土、掺聚丙烯纤维和钢纤维的活性粉末混凝土在静载和不同动载速率下进行试验,得到不同应变率下试件的动态压缩强度、动力增长系数及应力应变过程曲线.     

悬浮态TiO2光催化降解偶氮染料中性深黄GL

采用紫外杀菌灯作为光源,以悬浮态TiO2为光降解催化剂进行了偶氮染料中性深黄GL的光催化降解研究.讨论了体系的pH值、催化剂的投入量、通气量以及起始浓度等因素对光催化降解中性深黄GL效率的影响.结果表明中性深黄GL的光催化降解适宜条件为pH=2.00;催化剂的投入量为1.4 g/L;通气量为300 mL/min.光降解100 min,脱色率可达96%,降解后的染料已基本无色.动力学研究表明中性深黄GL的光催化降解符合一级动力学规律.在λ=436 nm处,中性深黄GL的光最大降解速率Kdmax=一1.364 3 mg/(L@min),催化降解的表观反应速率常数k=0.026 8 min-1.     

方程a·(t-τ)＋bｘ·(t)＋cｘ(t-τ)＋dｘ（t）＝tｋ的部分解

采用待定系数法讨论了方程ａｘ·（ｔ－τ）＋ｂｘ·（ｔ）＋ｃｘ（ｔ－τ）＋ｄｘ（ｔ）＝ｔｋ的部分解，得到了在下列4种特殊情况下方程的解的表达式：(1)当ｃ＋ｄ≠0时；(2)当ｃ＋ｄ＝０，ａ＋ｂ－ｃτ≠0时；(3)当ｃ＋ｄ＝０，ａ＋ｂ－ｃτ＝０，ｃτ－２ａ≠０时；(4)当ｃ＋ｄ＝０，ａ＋ｂ－ｃτ＝０，ｃτ－２ａ＝０时.