Non-confluence in divisionless P systems with active membranes

We describe a solution to the SAT problem via non-confluent P systems with active membranes, without using membrane division rules. Furthermore, we provide an algorithm for simulating such devices on a nondeterministic Turing machine with a polynomial slowdown. Together, these results prove that the complexity class of problems solvable non-confluently and in polynomial time by this kind of P system is exactly the class .     

基于初始磁导率的铁氧体裂纹检测

铁氧体是电子电路中广泛使用的抗干扰元件,生产中应力引发的内部缺陷裂纹严重影响其电气性能。其传统检测方法准确率低、速度慢,难以满足产品的快速检测需求。将基于初始磁导率的缺陷检测方法运用于铁氧体工件的检测,对检测传感器进行优化,使之能够在微小激励下获得准确的输出响应。对改进前后的传感器进行了对比实验,分别就其结构、尺寸、磁导率等参数进行了针对性分析,证明了该检测方法和参数优化的有效性。     

基于模糊算法的炉料粒级分布优化系统

本文在深入研究鼓风炉铅锌熔炼过程的基础上,分析了入炉炉料的粒级分布和透气性指数之间关系,提出了用模糊控制方法来计算鼓风炉入炉炉料的粒级分布,提出了基于专家规则的模糊控制算法,采用参数自修正自寻优的方法,不断对模型进行在线修正,仿真结果表明,采用该模型控制的透气性波动较小,趋势趋于平衡。     

膜催化反应器的分析与模拟

分析了膜反应器的出现、发展和最新研究。论述了几种膜反应器中气体的传递机理,定量分析了膜反应器中控制传递与反应的模型方程式以及计算机模拟和实验研究结果。最后评价了两类膜反应器的操作特性,以⊿n<0、⊿n=0和⊿n>0三类不同的催化反应作为模型反应与传统的PFR 和 MFR 的操作特性作了对比。     

Microwave permeability of single cobalt nanotube studied by micromagnetics simulations and generalized Snoek’s law

Microwave permeability spectra of single Co nanotube under equilibrium state have been studied by micromagnetics simulation.More than four obvious resonance peaks have been found(11.72,24.20,33.18 and 39.55 GHz).Such large resonance frequency cannot be found in other traditional magnetic materials.The configurations of magnetic moments along the nanotube have been simulated.The results show that the top end of nanotube has a"flow-out"pattern of magnetic moments configuration.The bottom end has a"flow-in"pattern of magnetic moments configuration.The magnetic moments within the main body of nanotube are aligned perfectly along the length of nanotube.The magnitude of natural resonance peak is strongly related to the volume fraction of a zone,which has the same orientation of magnetic moments.Large microwave permeability values have been found for single nanotube.The generalized Snoek’s law has been used to validate the micromagnetics simulations in this paper.     

Influence of cement type on transport properties and chemical degradation: Application to nuclear waste storage

The geological repository of nuclear waste in concrete containers is a possible storage method explored by ANDRA (Agence Nationale pour la gestion des Déchets RadioActifs). The concrete must display a high confinement capacity for long periods, characterized by low transport properties and by the acido-basic buffer of hydrated cement. During service life, these properties can be endangered by chemical attack of underground water. The cement type has an important influence on the concrete's performances. Then, it is essential to establish appropriate mixtures with accurate components. In this work an ordinary Portland cement and a fly ash and blast furnace slag blended cement are compared. To determine confinement capacities, transfer properties and mortars microstructure were investigated. To predict the long term behaviour, an ammonium nitrate test has been developed to enhance decalcification and to accelerate hydrolysis of cementitious materials. Measurement of degraded depth with time regarding calcium content was carried out. Impact of decalcification on transport properties was evaluated. Fly ash and blast furnace slag provide better properties for native mortars, and more particularly diffusion properties, but not as much as necessary to limit leaching in degraded material by chemical attack.     

膜法富氧在国内应用新进展

膜法富氧及其助燃技术的应用非常广泛。主要介绍了膜法富氧技术在国内玻璃窑、锅炉、注汽炉、热风炉、医疗保健和FCC富氧再生等方面应用的最新进展。     

新型钴基非晶态合金屏蔽材料的磁性研究

研究了不同退火条件下，新型屏蔽材料钴基非晶态合金Co66Fe4Ni1Si15B14的磁阻抗比（MIR）和磁导率比（PR）。采用了两步冷却法（F＆W），通过协同降低内热应力和磁有序，提高了样品的初始磁导率。研究结果表明，F＆W法试样的初始磁导率（μi）比单独用熔炉冷却法（FC）和水淬火法（WQ）分别提高了50％和100％。通过测量试样的MIR和PR，研究了试样软磁性的退火效应，3．1MHz下FC法试样和WQ法试样在420℃退火温度下具有比F＆W法更优越的软磁性。     

Stress recovery in geometrically nonlinear membranes by a Hu-Washizu finite element formulation

A class of mixed finite elements based on the Hu-Washizu functional is introduced as a strategy to reduce the spurious stress phenomena encountered with standard or displacement-based formulations for geometrically exact membranes. Selected examples compare the performance of this class of elements with that of the standard formulation and demonstrate that reduction of spurious stresses is obtained and that the stresses are more accurate than those optimally sampled in the standard formulation.