红血球生长差分模型解的渐近性

差分方程△xn=rn(-xn pe^-rxn-k),n=0,1,2,…，用来描述红血球生长规律，运用迭代法给出了保证方程每一正解{xn}趋于正平衡点的一族充分条件，所得结果不仅异于已知结论，并且文中推论改进了已有定理。     

薏苡仁酯对荷瘤小鼠红细胞免疫功能及Na~+,K~+-ATPase活性的影响

薏苡仁酯对荷瘤小鼠红细胞免疫功能具有显著的促进作用，对红细胞膜上的Ｎａ＋，Ｋ＋－ＡＴＰａｓｅ有抑制作用。其抑制作用呈量效正相关。薏苡仁酯的后一作用可能是其促进荷瘤小鼠红细胞免疫功能的机理之一。     

现代垃圾填埋场场底防渗衬垫的设计

本文全面介绍了现代垃圾填埋场场底防渗衬垫的种类、设计要求、使用性能和适用范围，并结合工程方案进行了对比、评价，推荐适宜的可行性方案。     

红泥聚氯乙烯(RM-PVC)复合材料光稳定性机理

纯PVC在紫外光照射下也易脱去HCl而生成共轭双键,RM-PVC优良耐光老化机理主要是,红泥中的Fe_2O_3,能强烈地吸收紫外光,以及红泥中的钙、硅等其它一些成分也能一定程度地吸收紫外光,从而使基体PVC基本上免遭光能作用而降解、破坏。     

大蓟刺儿菜花红色素的提取测定及性能研究

采用单pH测定法和pH差示法,测定了大蓟刺儿菜花红色素含量的影响因素、线性范围及适用性,对比结果单pH测定法适宜测定大蓟刺儿菜花红色素含量.以色素含量为指标,采用单pH测定法,对大蓟刺儿菜花红色素的提取及性能进行详细的研究.结果表明:大蓟刺儿菜花红色素在pH值为1.0,体积分数50%的乙醇为浸提剂,料液比为1 g∶20 mL,温度为55℃,浸提时间2.0 h为最佳提取条件.色素的色价为272,在水、乙醇中的溶解性好,对酸、热稳定,强光对色素有一定的降解作用.色素在氧化剂H2O2中稳定性较好,还原剂N a2SO3对色素有影响.     

Evaluation of cement degradation induced by the metabolic products of two fungal strains

Summary During their metabolism, microorganisms can produce acids able to bring about the degradation of cement. Two acid-producing alkalophilic fungal strains have been isolated from soil, a strain ofAspergillus niger which produces gluconic and oxalic acid and ofMycelia sterila which produces gluconic and malic acid. After eleven months of contact the acids produced byAspergillus dissolved portlandite with a low leaching of calcium, increased the cement porosity by 11.4%, and reduced the bending strength by 78%. The second strain is responsible for a significant dissolution of portlandite with a leaching of calcium of 4.2% of the initial content, an increase of the porosity of 11%, and a loss of the bending strength of 62%. Direct contact of mycelia with the cement surface is not necessary for effective dissolution to take place. Low pH and a high temperature favor the the production of acids.     

Fluoresence quenching method for the determintion of trace amount of cadmium with iodide-acridine red system

Ａｎｕｍｂｅｒｏｆｆｌｕｏｒｅｓｃｅｎｃｅｍｅｔｈｏｄｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄｆｏｒｔｈｅｄｅｔｅｒｍｉｎａｔｉｏｎｏｆｃａｄｍｉｕｍ，ｂａｓｅｄｏｎｉｔｓｃｏｍｐｌｅｘｗｉｔｈｏｒｇａｎｉｃｄｙｅｓ，ｓｕｃｈａｓ８ｈｙｄｒｏｘｙｑｕｉｎ...     

红壤资源信息系统的研制及其应用初探

从系统总体设计、系统建立及应用模型开发诸方面对红壤资源信息系统的研制及其应用进行了初步探讨。