The Bin-Packing Problem: A Problem Generator and Some Numerical Experiments with FFD Packing and MTP

In this paper a problem generator for the Bin-Packing Problem (BPP) is presented which is suggested to be used in future for the empirical evaluation of exact and heuristic solution methods. Also some numerical experiments are performed with FFD Packing in order to identify hard problem classes of the BPP. From the results it becomes evident that the design of a previous test by Martello and Toth, in which the authors tried to verify the solution power of their method, MTP, has been biased. Thus, new experiments with MTP have been performed on instances from more challenging problem classes. Our results confirm the general opinion that MTP represents the state-or-the-art for exact solution methods for the BPP, even though the size of the problems, which can be solved to a proven optimum in reasonable computing time, still appears to be unsatisfactory.     

2M高速信令链路MTP2的分析与设计

随着全国电信业务量的不断增加,特别是移动用户数量的剧增,原有的No．7信令网中使用的信令链路的带宽已经不能完全适应网上业务量的需求,无论是电信运营部门还是设备生产厂商都提出了对高速信令链路的需求;另一方面由于芯片技术的发展,微处理器速度的不断提升也为实现高速信令链路在技术上提供了支持。分析了2M高速信令链路与No．7信令链路在协议上的差别以及2M高速信令链路在MTP2层的软件设计以及功能划分,从而为具体实现提供了步骤及方法。     

煤基大甲醇制低碳烯烃项目的技术和经济初探

该文介绍了甲醇制烯烃国内外研发情况以及国内外甲醇制烯烃两条工艺路线的工艺和简单技术经济情况,提出了实施大甲醇项目和以甲醇为原料开发低碳烯烃等下游产品的建议。     

大型煤气化合成甲醇制丙烯（MTP）是我国煤化工的发展趋势

讨论了目前国内外煤气化制丙烯的发展情况,并简要地从投资、下游产品链以及工艺路线等方面对MTO和MTP工艺进行了比较,指出大型煤气化合成甲醇制丙烯在我国有广阔的市场前景。     

Oxidative stress mediated cytotoxicity of biologically synthesized silver nanoparticles in human lung epithelial adenocarcinoma cell line

The goal of the present study was to investigate the toxicity of biologically prepared small size of silver nanoparticles in human lung epithelial adenocarcinoma cells A549. Herein, we describe a facile method for the synthesis of silver nanoparticles by treating the supernatant from a culture of Escherichia coli with silver nitrate. The formation of silver nanoparticles was characterized using various analytical techniques. The results from UV-visible (UV-vis) spectroscopy and X-ray diffraction analysis show a characteristic strong resonance centered at 420 nm and a single crystalline nature, respectively. Fourier transform infrared spectroscopy confirmed the possible bio-molecules responsible for the reduction of silver from silver nitrate into nanoparticles. The particle size analyzer and transmission electron microscopy results suggest that silver nanoparticles are spherical in shape with an average diameter of 15 nm. The results derived from in vitro studies showed a concentration-dependent decrease in cell viability when A549 cells were exposed to silver nanoparticles. This decrease in cell viability corresponded to increased leakage of lactate dehydrogenase (LDH), increased intracellular reactive oxygen species generation (ROS), and decreased mitochondrial transmembrane potential (MTP). Furthermore, uptake and intracellular localization of silver nanoparticles were observed and were accompanied by accumulation of autophagosomes and autolysosomes in A549 cells. The results indicate that silver nanoparticles play a significant role in apoptosis. Interestingly, biologically synthesized silver nanoparticles showed more potent cytotoxicity at the concentrations tested compared to that shown by chemically synthesized silver nanoparticles. Therefore, our results demonstrated that human lung epithelial A549 cells could provide a valuable model to assess the cytotoxicity of silver nanoparticles.     

多目标追逐问题的一种混合整数线性规划解

研究多车辆多目标追逐的路径规划问题。提出两个基于混合整数线性规划 (Mixed integer linear programming, MILP) 的多目标追逐 (Multi-target pursuit, MTP) 模型：就近追逐和“一对一”使能追逐。在两个MIP追逐模型中,小车运动的状态方程考虑为具有线性阻尼的质点动力学方程。采用整数变量描述小车与障碍物的相对位置信息,提出 “目标膨胀尺寸”的概念来描述对目标的追逐,定义小车的“追逐方向”。采用选取整变量的等高面法求解MILP追逐问题,并给出初始内点整变量的确定方法。最后给出仿真试验1对两个多目标追逐模型进行对比研究,仿真试验2证实了算法的效率。     

Structural investigations on nanocrystalline Ni-W alloy films by transmission electron microscopy

Electrodeposited Ni-W alloys have been investigated in the as-deposited state by transmission electron microscopy in order to investigate the microstructural features in dependence of the tungsten content. Within the tungsten content range from 7 at.% up to 12 at.%, the microstructure is nanocrystalline characterized by a bimodal grain size distribution, consisting out of 20 to 200 nm sized grains and also larger grains with several 100 nm characteristic dimension. No clear trend in microstructure formation is visible with W content or deposition conditions in the investigated W content range. Only solid solution phase characteristics were observed. The lattice constant is 0.360 nm for 12 at.% W as derived from electron diffraction for the solid solution face centered cubic structure. Larger grains show twinning and stacking faults. Voids with diameter of a few nm were detected along with some multiple twinned particles, indicating high stress level during growth. About 2 at.% difference in the alloy composition from grain to grain was measured.     

甲醇制烯烃研究进展

本文比较详细地论述了甲醇制烯烃技术在国内外发展的概况,并针对实际情况对我国发展甲醇制烯烃提出一些建议。     

No.7公共信号系统及其网络

介绍了No．7公共信号系统的基本概念、功能结构及网络概念与基本结构形式。     

防焦剂MTP合成工艺的研究

以二硫代双吗啉和邻苯二甲酰亚胺为主要原料,经氯化反应、缩合反应制备Ｎ－吗啉硫代邻苯二甲酰亚胺,工艺过程简单,容易操作,当通氯量与二硫代双吗啉的摩尔比为（１．０３－１．０８）：１,产品收率可达８０％左右,选用２５％氢氧化钠溶液作为吸附剂和甲苯作为溶剂比较适宜。