钯/碳催化Suzuki偶联反应合成4,4-双戊基环己基联苯

报道了以 Pd/C为催化剂 ,在相转移催化剂十六烷基三甲基溴化铵的助催化作用下 ,通过 4 ( 4 戊基 )环己基苯取代硼酸与 4 ( 4 戊基 )环己基溴苯偶联反应合成了液晶化合物 4 ,4 双戊基环己基联苯 ,反应转化率 93% ,反式产物选择性为 85%。Pd/C经简单处理后可重复使用 5～ 6次 ,活性基本不变     

复合式镗铣加工中心热-结构耦合分析与研究

以TX1600镗铣加工中心镗削系统为研究对象,针对由热载荷和结构载荷引起的变形问题,建立了系统的热-结构耦合模型,分析了滑枕不同行程时系统的变形,得出镗削系统的变形量随滑枕行程的变化规律,并提出一种经济有效的误差补偿机构,显著地提高了机床的加工精度。     

非保守面耦合损耗因子的计算

本文应用统计能量分析理论和富里哀变换,推导出了非保守面耦合平行板系统间的耦合损耗因子的计算公式,保守面耦合平行板系统间的耦合损耗因子的计算公式能直接从该公式简化得出。已经进行了一系列验证实验,在大多数情况下,其实验数据与理论计算值吻合较好。     

Numerical Simulation of Fluid-Structure Interaction Using Modified Ghost Fluid Method and Naviers Equations

In this work, we deal with the 1D compressible fluid coupled with elastic solid in an Eulerian-Lagrangian system. To facilitate the analysis, the Naviers equation for elastic solid is cast into a 2×2 system similar to the Euler equation but in Lagrangian coordinate. The modified Ghost Fluid Method is employed to treat the fluid-elastic solid coupling, where an Eulerian-Lagrangian Riemann problem is defined and a nonlinear characteristic from the fluid and a Riemann invariant from the solid are used to predict and define the ghost fluid states. Theoretical analysis shows that the present approach is accurate in the sense of approximating the solution of the Riemann problem at the interface. Numerical validation of this approach is also accomplished by extensive comparison to 1D problems (both water-solid and gas-solid) with their respective analytical solutions. T.G. Liu’s current address: Department of Mathematics, Beijing University of Aeronautics and Astronautics, Beijing 100083. email: liutg@buaa.edu.cn.     

草甘磷废水预处理实验研究

采用多效氧化偶联蒸馏-强制性电化学反应工艺对草甘膦废水进行预处理实验研究；实验过程中研究了直接蒸馏与多效偶合催化氧化蒸馏相对比的方法,探讨出氧化偶联蒸馏与直接蒸馏的区别；并采用强制性电化学反应后废水B/C值大大提高,为后续生化反应奠定了良好的基础.强制性电化学反应考察了电解时间与B/C的关系,废水COD与电解时间的关系,pH值与COD之间的关系等.     

A new reactor concept for combining oxidative coupling and steam re‐forming of methane: modeling and analysis

A new and very promising application of auto‐thermal reactors is the coupling of endothermic and exothermic reactions where the product of the endothermic reaction is the desired one. Therefore, in this work, a reactor in which oxidative coupling of methane (OCM) and steam re‐forming of methane (SRM) reactions take place simultaneously was modeled. The results were obtained in a wide range of different conditions such as inlet feed, inlet temperature, portions of OCM and SRM catalysts, and inlet velocity. In selection of the catalysts, more attention was drawn to prevent re‐forming of OCM products. The main parameters of each reaction under different conditions such as conversion of the feed components, products selectivity and yield, temperature in the length of reactor, and component's concentration in the reactor were considered in course of this study. The results revealed that simultaneous OCM and SRM reactions in one reactor will tend to be auto‐thermal, and the waste of energy will be reduced. The results also show that complete conversion of water and majority of methane and oxygen will decrease the amount of unwanted products at the reactor's discharge–a constraint that exists in single reactors of each reaction specially OCM. Copyright © 2011 John Wiley & Sons, Ltd.     

基于CAE技术的歧管式催化转化器的设计与分析

结合歧管式净化器的性能特点及失效模式总结出了产品设计开发的一般流程，通过CFD分析、FEA 模态分析、FEA 流固耦合热应力分析等方法对歧管进行了分析，提出了歧管式净化器设计是否合理的性能评价标准，用于评判产品设计的优劣。     

带压作业油管接箍探测仪的研制

研制的带压作业油管接箍探测仪主要由传感器、报警器、激磁器等部分组成。它利用油管接箍通过时对激磁器与传感器构成的稳定磁场的扰动行为,触发传感器发出脉冲信号并传递给报警器,报警器将信号处理后发出声光报警,为工作人员进行下一步的操作提供控制指令。现场应用证明:采用油管接箍探测仪可以使环形胶心工作寿命延长2倍,仅此一项,每年可节约成本84万元,取得了很好的经济效益;接箍探测仪的使用,提高了带压作业操作过程的安全性和可靠性,使生产效率大大提高;同时为带压作业实现自动控制奠定了一定基础,具有良好的推广应用前景。     

接箍夹紧变形测量与内壁圆度误差控制

油管接箍是典型的薄壁工件,在加工过程中,因夹紧力过大常造成接箍内壁螺纹圆度误差超差。为此,设计了3个传感器均布的测量方法。该方法利用3点误差分离法中的谐波抑制现象,运用NI的数据采集卡和Labview程序测量接箍在三爪卡盘下的夹紧变形量,分析夹紧变形量对加工后工件圆度的影响,得到夹紧变形量必须小于工件圆度公差要求的结论。实验结果表明,3点均布传感器的测量方法可靠,加工后接箍内壁的圆度误差和加工前的夹紧变形量基本相等。     

聚乙烯醇缩甲醛泡沫塑料负压渗水材料的改性与性能

为研究硅烷偶联剂KH550、聚硫橡胶(PR)对负压渗水材料聚乙烯醇缩甲醛泡沫塑料(PVFM)性能的影响,以聚乙烯醇、甲醛为原料,盐酸为催化剂,制备一系列改性PVFM,并测试其形貌、渗水性和力学性能等。结果表明,KH550改性PVFM可提高其饱和导水率,PR则表现相反;2种改性PVFM在-5kPa下累计入渗量比未改性PVFM少,且均随用量增加而降低;2种改性剂均对PVFM发泡点有较大程度提升;2%KH550样品密度降低43.5%,1.5%KH550样品硬度提升64.6%;5%PR改性PVFM硬度达最大值71,PR改性PVFM断裂伸长率提升29.7%~46.7%;KH550改性的PVFM孔径增大,弯曲度更简单,导致硬度减小、导水率增大;PR改性PVFM立体网状结构更致密,加之-SH疏水基团增加,导致PVFM输水能力、负压渗水性降低。综合考虑,建议使用5.0%PR改性PVFM可改善PVFM负压渗水性能与力学性能,提高其工作稳定性。