沉淀池数值模拟技术的研究进展与评论

在水处理应用当中的沉淀池数值模拟研究近些年取得了很大的进展.自20世纪70年代,国外的研究人员开始进行许多沉淀池场方面的试验研究与数值模拟工作,在试验测量方面进行了原型池与模型池的测量,包括对速度场与浓度场都进行了许多的测量工作.国内于近几年也开始开展一些数值模拟研究工作,但试验测量方面的工作几乎没有.数值模拟技术尚未能很好地发展到实际工程应用的阶段.对模型的最新进展、所需解决的关键性问题进行了总结.     

原材料质量对萘系高效减水剂性能的影响

近几年,我国相继研制开发了一系列高效减水剂,目前萘系高效减水剂仍是产量最大,应用最广泛的一种高效减水剂。影响萘系高效减水剂性能的因素很多,本文主要探讨了原材料质量对其性能的影响。经过大量试验总结了其主要原料工业萘、硫酸和甲醛的质量对萘系高效减水剂性能的影响规律,以指导生产。     

A Bivariate Spline Method for Second Order Elliptic Equations in Non-divergence Form

A bivariate spline method is developed to numerically solve second order elliptic partial differential equations in non-divergence form. The existence, uniqueness, stability as well as approximation properties of the discretized solution will be established by using the well-known Ladyzhenskaya–Babuska–Brezzi condition. Bivariate splines, discontinuous splines with smoothness constraints are used to implement the method. Computational results based on splines of various degrees are presented to demonstrate the effectiveness and efficiency of our method.     

Fe掺杂GdBa2Cu3-xFexO7-δ超导体系的正电子湮没研究

利用X射线衍射(XRD)、正电子湮没等实验技术对Fe掺杂稀土超导体系GdBa2Cu3-xFexO7-δ(x=0.00-0.30)的晶体结构、局域电子密度n.以及超导电性进行了系统研究.实验结果表明,当Fe掺杂量在x=0.10附近时,体系的晶体结构发生了正交-四方相变.随Fe含量的增加,体系的超导转变温度逐渐降低,且超导...     

Water Oxidation Catalysts for Artificial Photosynthesis

Water oxidation is the primary reaction of both natural and artificial photosynthesis. Developing active and robust water oxidation catalysts (WOCs) is the key to constructing efficient artificial photosynthesis systems, but it is still facing enormous challenges in both fundamental and applied aspects. Here, the recent developments in molecular catalysts and heterogeneous nanoparticle catalysts are reviewed with special emphasis on biomimetic catalysts and the integration of WOCs into artificial photosystems. The highly efficient artificial photosynthesis depends largely on active WOCs integrated into light harvesting materials via rational interface engineering based on in‐depth understanding of charge dynamics and the reaction mechanism.     

Sonographic analysis of recurrent parotitis in children: a comparative study with sialographic findings

BACKGROUND: Patients with asthma show altered surface expression of the adhesion molecules CD11b and L-selectin on airway granulocytes compared with blood granulocytes. OBJECTIVE: To investigate whether this modulation is related to disease activity or due to transendothelial migration, we compared the CD11b and L-selectin expression on blood and induced sputum eosinophils and neutrophils between patients with asthma and normal subjects. METHODS: Eleven normal subjects (21-43 years), nine patients (21-34 years) with mild atopic asthma and 10 patients (20-47 years) with moderate to severe atopic asthma on regular treatment with inhaled steroids underwent sputum induction by inhalation of nebulized hypertonic saline (4.5%). CD11b and L-selectin expression on granulocytes from blood and DTT-homogenized sputum were analysed by flow cytometry. Eosinophils could be discriminated from neutrophils by using depolarized light scatter. Disease activity was assessed by baseline FEV1 and airway responsiveness to histamine (PC20). RESULTS: Sputum eosinophils showed higher expression of CD11b (P<0.001) and lower expression of L-selectin (P<0.001) compared with peripheral blood eosinophils. CD11b and L-selectin expression on eosinophils from blood or sputum did not differ between the three groups. Similar results were obtained for neutrophils. The PC20 in the patients with moderate-to-severe asthma was related to CD11b expression on blood (R=-0.92, P=0.001) and sputum eosinophils (R=0.75, P=0.02). CONCLUSIONS: Flow cytometry of induced sputum granulocytes from asthmatic as well as normal subjects is feasible. We conclude that the modulated expression of CD11b and L-selectin on airway granulocytes is not specific for asthmatic airway inflammation, but is probably the result of tissue migration per sé. This implies that CD11b and L-selectin expression on granulocytes in induced sputum cannot be used as marker of disease activity.     

Mechanical properties of discontinuous fiber reinforced thermoplastics. II. Random-in-plane fiber orientation

The mechanical properties are presented for a series of discontinuous fiber-reinforced thermoplastic composites made with random-in-plane fiber orientation. The matrix and fiber materials were chosen to provide a wide range of strength, modulus, ductility and adhesive properties. In many cases strong, rigid, yet tough composites were fabricated. Strength levels of over 20,000 psi and modulus values over 1,000,000 psi were reached in several systems reinforced with short Kevlar-49 and graphite fibers. A strong dependence of composite strength and modulus on fiber strength and modulus was noted indicating good transfer of load from matrix to reinforcement. Fiber efficiency factors for modulus and strength were calculated for the experimental composite systems and averaged 0.19 and 0.11 respectively. Data were analyzed using basic composite theory. Properties of the experimental composites could not be predicted from constituent properties.     

在活性填料塔内用稀硝酸吸收废气中的NOX

本文研究了填料的性能对硝酸吸收硝化废气中 NOX时吸收效率的影响 ,发现有些填料因能够催化亚硝酸根的氧化反应而明显提高了吸收效率。另外还研究了在活性填料塔内用稀硝酸吸收 NOX时 ,NOX的进塔浓度和液气比对吸收效率的影响。结果指出 ,吸收效率随操作液气比和 NOX进塔浓度的增大而升高     

油渍食用菌酱菜工艺技术研究

通过实验研究了油渍食用菌酱菜的加工工艺,确定了食用菌保脆工艺的最佳条件。结果表明,食用菌最佳保脆条件是用6%的NaCl处理鲜菇4h;酱料与食用菌最佳配比是2∶1。