滤板施工技术比较

滤板是水处理滤池工艺的重要组成单元,文章对预制滤板和整体现场浇筑滤板的施工技术进行了比较说明,并得出了滤板施工技术选型结论。     

Stabilization of the Single-Chain Fragment Variable by an Interdomain Disulfide Bond and Its Effect on Antibody Affinity

The interdomain instability of single-chain fragment variable (scFv) might result in intermolecular aggregation and loss of function. In the present study, we stabilized H4—an anti-aflatoxin B₁ (AFB₁) scFv—with an interdomain disulfide bond and studied the effect of the disulfide bond on antibody affinity. With homology modeling and molecular docking, we designed a scFv containing an interdomain disulfide bond between the residues H44 and L100. The stability of scFv (H4) increased from a GdnHCl₅₀ of 2.4 M to 4.2 M after addition of the H44-L100 disulfide bond. Size exclusion chromatography revealed that the scFv (H44-L100) mutant existed primarily as a monomer, and no aggregates were detected. An affinity assay indicated that scFv (H4) and the scFv (H44-L100) mutant had similar IC₅₀ values and affinity to AFB₁. Our results indicate that interdomain disulfide bonds could stabilize scFv without affecting affinity.     

Facile synthesis of ultrathin magnetic iron oxide nanoplates by Schikorr reaction

In this work, a very facile one-pot hydrothermal synthesis approach has been developed for the preparation of ultrathin magnetite nanoplates. The hydrothermal procedure was performed by aging ferrous hydroxide under anaerobic conditions, which is known as Schikorr reaction. Ethylene glycol (EG), which was introduced to the reaction as another solvent, played a critical role in the formation process of these nanoplates. Typically, hexagonal Fe₃O₄ nanoplates with a thickness of 10 to 15 nm and a side length of 150 to 200 nm have been synthesized with EG/H₂O = 1:1 in experiments. Our data suggest that the thickness of Fe₃O₄ nanoplates decreases, and the shape of the nanoplate becomes more irregular when the concentration of EG increases. The as-prepared Fe₃O₄ nanoplates were highly crystallized single crystals and exhibited large coercivity and specific absorption rate coefficient.     

核探针技术的初步应用

使用新建成的核探针开展了阿米巴细胞中微量元素锌的含量及其分布的观察;锰矿物中微米级矿粒和矿物相的分析;深海锰结核内微米级层状结构的分析;反球化元素对球墨铸铁的影响以及微量元素的偏析造成不锈钢零件局域性断裂的研究。     

玄武岩纤维对新拌混凝土性能影响研究

基于玄武岩纤维的经济性、稳定性,通过将不同种玄武岩纤维混凝土的诸项性能与基准混凝土、聚丙烯纤维混凝土作比较,研究玄武岩纤维对混凝土性能的影响,研究结果表明玄武岩纤维使混凝土的综合性能有较为明显改善。     

三元超导化合物Sc_5Ir_4Si_(10)的低温比热性质

在零场下2～300K以及不同磁场下2～10K温度范围内,分别测量了超导Sc5Ir4Si10单晶的比热。采用4-Einstein峰拟合声子谱的方法对高温部分进行处理,成功地分离了Sc5Ir4Si10的晶格比热和电子比热。10K以下的比热遵守经典的超导理论,即晶格比热与温度的三次方成正比,电子比热符合温度的幂指数关系。4K以下电子比热的磁场关系为ΔCe/T∝Hα,其中α与温度有关。随着温度的降低α的值从0.67增大到0.76,表明Sc5Ir4Si10的超导配对可能是s波和d波混合波,并由d波向s波转化。     

滚动轴承接触角智能测量仪

基于角接触球轴承运动学关系,本文给出了接触角测量原理,介绍了单片机轴承接触角测量仪的结构及软、硬件设计方法。该测量仪的研制为角接触球轴承的生产、选配和使用提供了重要的检测手段。     

Feasibility study of the treatment of aniline hypersaline wastewater with a combined adsorption/bio-regeneration system

Treatment of aniline hypersaline wastewater with a combined physical–biological method was investigated in this study. This method consisted of the physical adsorption of aniline from hypersaline effluents by resins and the biodegradation of the adsorbate and the regeneration of the adsorbent in the subsequent stage. The XDA-1 resin, selected from five commercial products, could separate aniline from salt effectively. The adsorption rate increased with the increase of salinity. Biodegradation of the aniline desorbed from the exhausted resin could be realized easily without salt interference. During the repetitive six combined operations, the percentage regeneration (PR) and NaCl separation efficiency (SE) of XDA-1 were 92.3% and 98.3%, respectively. No obvious difference could be found in pore size distribution between virgin XDA-1 and samples repeated six regeneration cycles. The PR of specific surface area and total pore volume of the bio-regenerated XDA-1 resin were 94.5% and 97.2%, respectively. It was indicated that XDA-1 could be bio-regenerated successfully and the regenerated resin could be re-utilized.     

Pulmonary toxicity and translocation of nanodiamonds in mice

Because of the possible health threat of nanodiamonds (NDs) to organisms, the pulmonary toxicity and translocation of NDs in different sizes in mice were investigated after intratracheal instillation administration. Biochemical assays, ultrastructural and histopathological evaluations of the lungs of the control and the ND exposed mice were carried out at 1, 7, 14 or 28 days post-exposure. Exposure to 1.0 mg/kg NDs with an average diameter of 4 nm produced a temporary lung index increase at 1 day post-exposure. NDs did not have evident adverse effects in the lungs within the studied period according to histopathological and ultrastructural investigations. Furthermore, no lipid peroxidation of the lung was observed. On the whole, intratracheally instilled NDs are of low pulmonary toxicity. In addition, the amount of NDs in alveolar decreased with time elapsed and the macrophages burdened with NDs were clearly observed in the bronchia from 1 day to 28 days post-exposure. Thus we affirm the critical role of alveolar macrophages in the main excretion pathway of NDs from the lungs, i.e. they engulf the NDs, migrate upward to the trachea by escalator/mucociliary system and finally enter the pharynx.