我国化肥催化剂工业现状

全国48家化肥催化剂制造厂总能力为57Kt/a,产量近30kt/a,设备利用率不到50%。平均万吨氨耗催化剂10.36t,高于国外5.60t水平。现生产31个品种203个型号的催化剂中有103种经部级鉴定,但经常使用的约50种。目前化肥催化剂工业水平与国外相比还存在四方面差距。     

抗菌薄膜的最新研究进展

介绍了抗菌薄膜的抗菌机理。综述了抗菌薄膜的种类和最新研究进展。提出了抗菌薄膜研究的发展趋势,即无机抗菌薄膜以纳米复合型抗菌薄膜为主要的发展趋势;天然抗菌薄膜以壳聚糖抗菌薄膜为主要的发展方向;高分子抗菌薄膜以含吡啶基团的聚合物抗菌薄膜为拓展方向;光催化型无机抗菌薄膜以纳米TiO2复合抗菌薄膜为主要的拓展趋势。     

空压机冷却系统除垢

我公司矿山现有5L-40/8空压机2台、4L-20/8空压机6台,空压机冷却系统都是循环水,冷却水池的水由清水泵经进水管首先打入中间冷却器和后冷却器,然后再进入Ⅰ级压缩缸和Ⅱ级压缩缸;再经漏斗、回水管流回凉水池.L型空压机中间冷却器安装在Ⅰ、Ⅱ级压缩缸之间,用以冷却Ⅰ级压缩缸排出的高温气体,后冷却器安装在空压机尾部,用以冷却Ⅱ级压缩缸排出的高温气体.     

多孔陶瓷分离膜

多孔陶瓷膜由于其优良的耐高温、耐腐蚀、耐微生物侵蚀等性质，近年来被快速地应用于分离领域。本文介绍其制备方法、性能测定及应用前景。     

苯酚催化氧化制备对苯二酚的研究

介绍了以苯酚为原料，采用催化氧化法合成对苯二酚的方法，讨论了各种因素对反应的影响，并得到了反应的优惠条件。本反应条件温和，三废少，对苯醌收率可达８０．４％。     

A Parallel Domain Decomposition Method for 3D Unsteady Incompressible Flows at High Reynolds Number

Numerical simulation of three-dimensional incompressible flows at high Reynolds number using the unsteady Navier–Stokes equations is challenging. In order to obtain accurate simulations, very fine meshes are necessary, and such simulations are increasingly important for modern engineering practices, such as understanding the flow behavior around high speed trains, which is the target application of this research. To avoid the time step size constraint imposed by the CFL number and the fine spacial mesh size, we investigate some fully implicit methods, and focus on how to solve the large nonlinear system of equations at each time step on large scale parallel computers. In most of the existing implicit Navier–Stokes solvers, segregated velocity and pressure treatment is employed. In this paper, we focus on the Newton–Krylov–Schwarz method for solving the monolithic nonlinear system arising from the fully coupled finite element discretization of the Navier–Stokes equations on unstructured meshes. In the subdomain, LU or point-block ILU is used as the local solver. We test the algorithm for some three-dimensional complex unsteady flows, including flows passing a high speed train, on a supercomputer with thousands of processors. Numerical experiments show that the algorithm has superlinear scalability with over three thousand processors for problems with tens of millions of unknowns.     

A Stability Criterion for Semi-Discrete Difference Schemes of Hyperbolic Conservation Laws on Uniform Grids

In the present study, the stability condition for semi-discrete difference schemes of hyperbolic conservation laws obtained from Fourier analysis is simplified. This stability condition can be applied only to linear difference schemes with constant coefficients implemented with periodic boundary treatment. It could often give useful results for other cases, such as schemes with variable coefficients, schemes for nonperiodic problem and nonlinear problem. However, this condition usually leads to a trigonometric inequality, which makes it not convenient to use. For explicit difference schemes on uniform grids, this trigonometric inequality can be converted to polynomial form. Furthermore, if the scheme is a high-order one, the polynomial can be factorized into a simple form. Thus, it is much easier to solve than the inequality obtained directly from Fourier analysis. For compact difference schemes and conservative schemes, similar results are obtained. Some applications of this new stability criterion are shown, including judging the stability of two schemes, proving the upstream central schemes to be stable, constructing a stable upwind dissipation relation preserving (DRP) scheme and constructing an optimized weighted essentially non-oscillatory (WENO) scheme. Since WENO schemes are nonlinear schemes, the stability analysis in the present study is performed on their underlying linear schemes. According to the numerical tests, the underlying linear scheme should be stable, otherwise the corresponding WENO scheme may display instability. These applications demonstrate that this criterion is convenient and efficient for judging the linear stability of semi-discrete difference schemes and constructing stable upwind difference schemes.     

配料系统中核子秤的实物标定法

针对使用单位对核子秤实物标定方法的认识与掌握不够，而导致核子秤不能正常使用的问题，文中详细介绍了配料系统中应用核子秤进行实物标定的条件及几种方法。     

新型节能玻璃钢门窗的研究

本文主要围绕节能主题，从能耗方式、性能指标、结构形式、制作安装等方面论述了玻璃钢门窗在不同气候地区、不同环境和不同领域中的开发和应用。     

磺草酮对玉米的安全性及除草效果评价

田间测定了磺草酮对玉米的安全性及防除杂草试验效果，结果表明磺草酮有效成分562．5～1200g／hm^2防除玉米田单子叶杂草马唐、牛筋草、狗尾草效果较好，防效为86．5％～98．0％；对双子叶杂草中的反枝苋防效较好，防效为99．3％～l00％；对铁苋莱和马齿苋防效较差，防效为35．0％～62．9％。对玉米有触杀性药害，至药后15天药害症状消失，不影响玉米的产量，且有较好的增产作用，增产l0．0％左右。