钢筋混凝土界面的疲劳损伤

钢筋与混凝土界面的脱粘是钢筋混凝土材料与结构的主要失效形式之一。针对笔者建立的几何剪切筒模型和选取的常用实验加载方式 ,推导出循环荷载作用下钢筋与混凝土界面脱粘应力解析模型 ,借助断裂力学的基本理论 ,进一步研究和分析了界面疲劳脱粘速率及界面摩擦剪应力与循环加载次数的关系 ,同时考虑了泊松比对疲劳特性的影响 ,为混凝土结构的安全评估提供一个新思路。     

固定化细胞小球降解三氟甲苯的特性研究

制备了包埋菌种z3的海藻酸钙小球，对固定化细胞小球的机械强度和三氟甲苯的降解率做了研究。通过改变海藻酸钙凝胶组成，添加硅藻土、蛋白质，使用交联剂己二胺、戊二醛等方法，提高了固定化包埋小球交联的密度和机械强度，保持了固定化小球对三氟甲苯的降解活性。扫描电镜显示了包埋小球经过己二胺一戊二醛处理之后，小球的表面结构成网格状，内部网格复杂化，不均匀程度增加。     

Sterilization of Escherichia coli cells by the application of pulsed magnetic field

The inactivation of microorganisms by pulsed magnetic field was studied. It was improved that the application of electromagnetic pulses evidently causes a lethal effect on E. coil cells suspended in phosphate buffer solution Na2HPO4/NaH2 PO4 (0.334/0.867mmol/L). Experimental results indicated that the survivability( N/N0 ; where N0 and N are the number of cells survived per milliliter before and after electromagnetic pulses application, respectively) of E. coil decreased with magnetic field intensity B and treatment time t. It was also found that the medium temperatures, the frequencies of pulse f, and the initial bacterial cell concentrations have determinate influences in destruction of E. coil cells by the application of magnetic pulses. The application of an magnetic intensity B = 160 mT at pulses frequency f= 62 kHz and treatment time t = 16 h result in a considerable destruction levels of E. coil cells ( N/N0=10^-4). Possible mechanisms involved in sterilization of the magnetic field treatment were discussed. In order to shorten the treatment time, many groups of parallel inductive coil were used. The practicability test showed that the treatment time was shortened to 4 h with the application of three groups of parallel coil when the survivability of E. coli cells was less than 0.01%; and the power consumption was about 0.2 kWh/m^3 .     

氯苯驯化活性污泥对同类有机物的好氧降解性比较研究

利用测定微生物呼吸耗氧量的方法,对氯苯类中的５种优先污染物：氯苯,邻,间,对－二氯苯１,２,４－三氯苯,用接种活性污泥和经氯苯驯化的污泥地它们的生物降解性能进行了测试。实验结果表明,用未经驯化的污泥,５种氯苯皆存在的抑制作用,抑制作用的大小和抑制时间的长短氯代程度和浓度的影响,用氯苯将此污泥驯化后,该污染不仅表现出对苯具有降解能力,而且也表现出邻二氯苯,间二氯苯等同类有机物的共代谢降解能力,经分析     

磁处理水对蚕豆根尖细胞的遗传学效应

利用蚕豆根尖细胞微核测试技术研究了磁化水（4200GS）对蚕豆根尖细胞的微核率、有丝分裂指数、染色体桥率、不正常细胞率等遗传学指标的影响,目的是探讨磁处理水对生物体的遗传学效应,结果发现上述指标均有所上升,其中微核率和不正常细胞率上升显著,并且其大小与水在磁场中处理的时间长短有关,提示磁处理水（4200GS）有一定的遗传学毒性     

Characterization of modified Alternanthera philoxeroides by diethylenetriamine and its application in the adsorption of copper(II) ions in aqueous solution

Environmental Science and Pollution Research - By a simple and convenient method of using epichlorohydrin as linkages, a novel Alternanthera philoxeroides (AP) derivative modified with...     

Influence of the residence time of street trees and their soils on trace element contamination in Paris (France)

Environmental Science and Pollution Research - With the actual increasing interest for urban soils, the evaluation of soil contamination by trace elements and the dynamics of this contamination...     

改性粉煤灰去除硝基苯废水的研究

粉煤灰经过废硫酸改性处理后吸附能力大大提高,用改性粉煤灰对生化后的硝基苯废水进行了实验研究,实验考察了粉煤灰的投加量、pH值、吸附时间对硝基苯去除率的影响,并对机理进行了分析.粉煤灰改性后应用于硝基苯废水处理中达到以废治废,具有一定的经济意义.     

饮食业油烟道火灾事故概率的模糊事故树分析

根据常规事故树定量计算中基本事件概率的不确定性问题,通过引入模糊集的概念,将常规事故树中基本事件的发生概率模糊化,用三角形模糊数代替确定性发生概率,应用模糊数截集方法,推导了模糊事故树的相关算法.采用模糊事故树方法得到饮食业油烟道火灾事故发生概率,并进行了敏感性分析,找出对顶事件发生概率影响较大的基本事件,确认减小油烟道火灾事故发生的相关措施.研究表明,饮食业油烟道火灾事故概率的模糊事故树分析是切实可行的,有助于对饮食业油烟道火灾的认识、预防和扑救工作.     

采用固体氧化物燃料电池反应器脱除H2S

采用固体氧化物燃料电池反应器脱除H2S,反应器以Co-Mo双元硫化物作电催化剂,Zr掺杂的BaCeO3（BCZY）为固体电解质。研究了燃料电池的燃料气流量、反应温度和电流密度等参数对H2S去除率的影响。结果表明：在反应温度为800℃、燃料气流量为30mL／min的条件下,H2S去除率达71％;在测量的电流密度区间内,H2S去除率与电流密度之间呈线性关系。电能回收实验结果表明,当采用掺杂5％（质量分数）BCZY的Co—Mo双元硫化物作为阳极时,单体燃料电池输出电压达0．68V,最大电功率密度为3．5mW／cm2。因此,燃料电池技术脱除H2S是一种废气资源化的有效手段。