导风筒挂胶布生产配方的改进

本文研究了导风筒挂胶布生产中原丁苯橡胶用量30%,天然橡胶用量70%,含胶率40%的基本配方,将配比改为丁苯橡胶用量60%,天然橡胶用量40%,含胶量为38%,并且通过调整硫化体系,补强体系,软化体系,使产品的各项物理机械性能达到化工部 HG4—399—82标准,降低了天然橡胶用量,提高了企业的经济效益。     

结构动态优化的状态空间混合法

本文提出了一种新的动态优化方法——状态空间混合法。它以梯度投影法为基础将数学规划法和优化准则法结合起来,推导了迭代方程式,确定了加权矩阵和迭代步长的表达式。作者研制了这种算法的通用计算机程序,给出了计算实例结果,并以槽钢作柱、厚钢板作梁,设计制作了原始和优化框架模型,对模型进行了稳态正弦激振试验和瞬态脉冲激振试验。计算和试验表明,该算法收敛快,计算精度高,通用性好,有实用价值。     

高速宽叶风机叶片破坏的机理分析

在研制新型风机的中间试验过程中,当转速达到一定值时,宽叶片风机出现了叶片的失稳破坏,这种破坏形式还未曾见过报导,可能还只是首次发生。本文分析了破坏的机理,并提出了三种改进方案,使叶片的失稳破坏转速有较大提高;其中一种工艺方案比原制造工艺更为简单,且完全不影响风机的气动性能和效率。已被风机制造厂采纳,并通过了试验。     

水解蛋白的苦味及消除方法

经酶法制备的水解蛋白往往带有苦味,其主要原因是蛋白质本身的一些疏水基团的作用:水解过程中影响苦味程度的主要因素是疏水基团的位置、水解度、pH用酸、原料的品质等.本文介绍了通过流水性吸附、掩蔽、专一性酶的应用以及选择性沉淀的方法消除或减轻水解蛋白的苦味.     

导热姆热管在汽车上的应用

在中温余热回收范围内很少应用热管,其主要原因是在热管中使用何种工质尚处于研究阶段。本文研制了导热姆热管,并且已将它用于热管换热器中回收中温范围的排气余热来加热车厢。这种采暖装置具有传热能力强、流动阻力低、结构简单、性能可靠等优点。     

论复合型表面裂纹准则

本文用理论和试验分析相结合的方法研讨了作者和前人先后提出的表面裂纹复合型断裂准则[G]max、[S]min、[σ_θ]max、[U_v]max、[σ_α]max和[r_p]max六个准则;再次证明了后三个准则优于前三准则;实测出了表面裂纹最深点的起裂角和临界起裂载荷随表面裂纹倾斜角的变化规律;最后指出了断裂准则中断裂参数应建立在相同的力学基准上,从而为工程应用和理论研究提供了可靠的依据。     

Measurement and correlation of solid–liquid phase equilibria for binary and ternary systems consisting of N-vinylpyrrolidone, 2-pyrrolidone and water

The solid–liquid equilibria(SLE)for binary and ternary systems consisting of N-Vinylpyrrolidone(NVP),2-Pyrrolidone(2-P)and water are measured.The phase diagrams of NVP(1)+2-P(2),NVP(1)+water(2),NVP(1)+2-P(2)+1 wt%water(3)and NVP(1)+2-P(2)+2 wt%water(3)are identified as simple eutectic type with the eutectic points at 263.75 K(x_(1E)=0.5427),251.65 K(x_(1E)=0.3722),260.25 K(x_(1E)=0.5031)and256.55 K(x_(1E)=0.4684),respectively.The phase diagram of 2-P(1)+water(2)has two eutectic points(x_(1E)=0.1236,T_E=259.15 K and x_(1E)=0.7831,T_E=286.15 K)and one congruent melting point(x_(1C)=0.4997,T_C=303.55 K)because of the generation of a congruently melting addition compound:2-P·H_2O.The ideal solubility and the UNIFAC models were applied to predict the SLE,while the Wilson and NRTL models were employed in correlating the experimental data.The best correlation of the SLE data has been obtained by the Wilson model for the binary system of NVP+2-P.The UNIFAC model gives more satisfactory predictions than the ideal solubility model.     

金黄节杆菌CYC705腈水解酶催化亚氨基二乙酸合成的研究

将金黄节杆菌CYC705(Arthrobacter aurescens CYC705) 腈水解酶用于生物催化合成亚氨基二乙酸(IDA),从生物催化剂的形式、生物催化反应过程优化和反应体系放大三个方面进行了考察。在氨基载体固定化酶、环氧基载体固定化酶、海藻酸钠固定化细胞、壳聚糖固定化细胞和游离全细胞几种生物催化剂形式中,壳聚糖固定化细胞催化效率最高、稳定性最好。通过反应体系、反应温度、金属离子、底物浓度、固定化细胞投量等因素的优化,确定了最佳的生物催化反应条件：以50 mmol/L pH=6.6的磷酸氢二钠-柠檬酸缓冲液作为反应体系,底物亚氨基二乙腈(IDAN)的浓度为200 mmol/L,添加CoCl2至终浓度为1 mmol/L,反应温度37 ˚C,固定化细胞投量为0.25 g每5 mL反应体积。在此条件下,反应2h可将IDAN完全转化为IDA。进一步将反应体系放大10倍,催化200 mmol/L的IDAN完全转化为IDA仅需1h。     

Oxygen vacancy levels on gadolinia-doped ceria interlayer deposited by atmospheric pressure plasma jet for solid oxide fuel cells

The oxygen vacancy levels as a factor on different gadolinia-doped ceria interlayer (GDCi) films deposited on yttria stabilized zirconia (YSZ) electrolyte substrates by an atmospheric pressure plasma jet (APPJ) via precursor solution of nitrate salts are investigated. Focusing on the effect of carrier gases, scanning electron microscopy (SEM), Raman, and X-ray diffraction (XRD) are implemented for the materials characterization of the as-deposited GDCi films and sintered-GDCi films at various temperatures. The higher level of oxygen vacancies in GDCi films adhered on 8YSZ electrolyte are evidently analyzed using Ar as the carrier gas during the deposition, of which the interdiffusion resulted in the formation of (GDC + YSZ) solid solution for sintering over 1300?°C degraded the total conductivity. The deposition of GDCi films on 8YSZ by APPJ method using O₂ carrier gas significantly improved the total conductivities of the whole electrolyte layers. Moreover, this study provides the useful insight into the oxygen vacancy levels on GDC films as interlayer (GDCi) to improve the values of open circuit voltage in LSM/GDCi/YSZ/Pt full-cell, as well as offering the efficiency of APPJ as one step deposition process.