国内施工企业援外项目竞标过程中相关重点环节的浅析

本文是笔者在多年援外项目的竞标过程中投标经验的总结和相关见解,论述了施工企业如何在援外项目竞标中满足业主的要求,提升企业自身投标竞争力.特别对在投标的重点环节上--施工组织大纲和报价文件的编写方面提出了自己的见解,并给出了施工组织大纲和报价的编写重点和办法.     

粉未橡胶在新型摩擦材料中的应用

以粉末丁腈橡胶、粉末丁苯橡胶和粉末天然橡胶作增韧剂，研制汽车的“无纤维新型制动材料”。试验结果表明，粉末丁腈橡胶效果最佳，粉末丁苯橡胶次之，而粉末天然橡胶则不宜采用。以酚醛树脂与粉末丁腈橡胶（用量各１０％）为基材的无纤维摩擦材料，其摩擦系数（０．３９—０．４４）、磨损率（０．１０８ｍ３·Ｊ－１）、抗冲击强度（３１６０Ｊ·ｍ－２）及抗热衰退能力等都高于国家标准要求。扫描电镜分析表明，犁切作用是引起磨损的重要原因之一。     

多周期交错采样法均值滤波消除工频干扰

在工业测控中,微弱的传感器信号常常受到50Hz电源频率的干扰,在一个电源周期20ms内多点采样求均值是常用的滤除办法之一。本文提出一种多周期交错采样的方法,即在多个电源周期内等时间间隔采样,所有采样点的相位等效到一个电源周期内,同样也是等相位间隔,从而成倍地加长了采样周期,减轻了处理器的负担。同时给出多周期交错采样公式,并进行了频谱分析。     

新型海水水泥浆体系的研究与应用

通过室内试验研究的新型海水水泥浆在渤海油田油层套管固井中得到成功应用。应用结果表明,新型海水水泥浆能够满足中深部地层(2000m左右)固井作业的要求,作业安全可靠,固井质量优良,对储层的伤害低于淡水水泥浆。新型海水水泥浆的成功应用,打破了以往海上技术套管和油层套管固井作业只能依赖淡水的限制。在海上钻井作业中广泛应用新型海水水泥浆,能够取得良好的社会效益和经济效益。     

芳纶纤维增强橡胶密封板材的配方设计

以拉伸强度为指标，利用均匀设计法对芳纶纤维增强橡胶密封板材进行配方设计，优选得到了理想的配方。采用模压工艺制备出了优选配方的密封板材，并作了性能测试。试验结果表明，其各项性能均达到了国家标准(报批稿)的要求。     

A new improved whale optimization algorithm with joint search mechanisms for high-dimensional global optimization problems

Similar to other swarm-based algorithms, the recently developed whale optimization algorithm (WOA) has the problems of low accuracy and slow convergence. It is also easy to fall into local optimum. Moreover, WOA and its variants cannot perform well enough in solving high-dimensional optimization problems. This paper puts forward a new improved WOA with joint search mechanisms called JSWOA for solving the above disadvantages. First, the improved algorithm uses tent chaotic map to maintain the diversity of the initial population for global search. Second, a new adaptive inertia weight is given to improve the convergence accuracy and speed, together with jump out from local optimum. Finally, to enhance the quality and diversity of the whale population, as well as increase the probability of obtaining global optimal solution, opposition-based learning mechanism is used to update the individuals of the whale population continuously during each iteration process. The performance of the proposed JSWOA is tested by twenty-three benchmark functions of various types and dimensions. Then, the results are compared with the basic WOA, several variants of WOA and other swarm-based intelligent algorithms. The experimental results show that the proposed JSWOA algorithm with multi-mechanisms is superior to WOA and the other state-of-the-art algorithms in the competition, exhibiting remarkable advantages in the solution accuracy and convergence speed. It is also suitable for dealing with high-dimensional global optimization problems.

     

低阶煤与玉米芯低温共热解的产物特性分析

采用低温干馏装置对不同玉米芯加入量的褐煤/玉米芯混合物进行低温共热解实验。结果表明：当玉米芯加入量为30%时,焦油产率最大为11.70%,比褐煤单独热解提高了53.75%。随着玉米芯的加入量增加,热解气中CO、CH₄和H₂含量逐渐增大。对热解焦油进行GC-MS检测,发现添加30%玉米芯后脂肪族质量分数从褐煤单独热解的24%提高到了30.67%,酚类质量分数从6.29%提高到了18.49%,杂原子质量分数从29.75%降低到了13.33%,一定程度上实现了焦油的轻质化和高品质化。对热解半焦进行SEM、比表面积分析和热值测定,发现共热解半焦表面变粗糙,孔隙结构得到改善,热值明显高于褐煤单独热解半焦热值。     

家电彩涂板表面颗粒问题的分析

结合生产实际,分析了马钢家电彩涂板生产过程中表面颗粒问题的产生原因并提出改进措施。     

Hexagonal Defect-Rich MnOx/RuO2 with Abundant Heterointerface to Modulate Electronic Structure for Acidic Oxygen Evolution Reaction

Developing green hydrogen energy to power future societies has driven the progress of proton-exchange membrane water electrolyzers (PEMWE). However, due to the complex anode oxygen evolution reaction (OER) electron transfer process and the strong acidic environment, the most effective catalysts are still Ir-based nanomaterials. Therefore, exploiting low cost acidic OER catalysts to meet the needs of PEMWE remains a challenging and rewarding task. Herein, hexagonal-shaped and defect-rich MnO_x/RuO₂ heterojunction nanosheets (H/d-MnO_x/RuO₂) is designed. The oxygen vacancies and heterogeneous structure enable the H/d-MnO_x/RuO₂ catalyst to reach 10 mA cm⁻² with only overpotential 178 mV in 0.5 m H₂SO₄. Density functional theory shows that the oxygen vacancies and heterogeneous interface facilitates the reduction of the adsorption energy of *OOH and the reduction of the energy level of Ru-Oads, thus suppressing the involvement of lattice oxygen and enhancing the durability. This study provides an effective way to design efficient catalysts for hydrogen production in PEMWE.