高压旋喷工艺中喷射流切割效果影响因素的研究

高压旋喷工艺中高压喷射流对土体介质的切割破坏是其核心技术,但以往对该问题的认识与研究仍然停留在定性阶段.借助物理模拟试验和数值模拟两种手段,对影响高压喷射流的切割效果有关因素进行了定量研究,得出了有益的结论,研究思路与成果可为同类问题提供借鉴与参考.     

影响HSPA网络质量的因素及克服

介绍了HSPA网络及其技术特点,阐明了在中国3G时代到来之际发展HSPA网络的重要性和必要性,指出了建设高质量的HSPA网络的关键在于提高HSPA整体的吞吐速率,从组网策略、功率分配、码字分配、调度算法选择等13个方面,对如何提高HSPA吞吐速率的问题提出了整套建议.     

NiMnCo触媒合金热轧开裂分析

对NiMnCo触媒合金加工过程中存在的热轧开裂问题作了研究。结果表明 :NiMnCo合金的热轧开裂为晶间断裂 ,裂纹沿晶界扩展。造成合金热塑性降低的原因是溶质 (杂质 )原子在晶界的偏析以及第二相夹杂物的存在。通过原材料处理及强化合金熔炼工艺可消除热轧裂纹的产生。     

Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment

The electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment was investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results show that uniform corrosion occurs on 300M steel during the electrochemical measurements because no anodic passivation phenomenon is observed on polarization curves within the measurement range. The tests also show that 300M steel is highly susceptible to chloride containing solution, which is characterized by corrosion current density increasing with the addition of chlorides, and corrosion potential shifting towards positive direction and corrosion resistance decreasing, positively suggesting that chloride ions speed up the corrosion rate of 300M steel. Meanwhile corrosion products on the 300M steel surface formed during the salt spray test are too loose and porous to effectively slow down the corrosion rate. Additionally, a schematic structure of uniform corrosion mechanism can explain that 300M steel has better property of stress corrosion cracking (SCC) resistance than stainless steels.     

Numerical Investigations of Film Cooling Characteristics of Interrupted Slot and Trench Holes on a Vane Endwall

This paper describes film cooling characteristics of the novel combined configuration employing interrupted slot and trench holes on a vane endwall.Interrupted ...     

新产品创意对快速原型的需求评价

由于需求的多变性、模糊性以及多样性的特点,使得新产品创意与市场需求之间存在一定的差距.为了实现新产品概念商业化的成功,产品创意必须再次回到市场需求问题上来,并经过需求评价等方法进一步完善与发展.本文结合设计实例,阐述了快速原型在问题评价时激发创造性思维中所起到的作用.     

冰淇淋专用大豆分离蛋白的酶法改性

研究了大豆分离蛋白用Alcalase碱性蛋白内切酶改性,使大豆分离蛋白轻度改性,研究其乳化特性和起泡性这两个功能特性,得出了预处理及酶解的最佳条件.     

γ-Fe NANO-POWDERS SYNTHESIZED BY LASER-PYROLYSIS

以SF_6为光敏剂,用CW CO_2激光诱导气相Fe(CO)_5热解反应,在室温下高效率地制备出了γ-Fe 纳米粒子(20—40nm),并对其进行了分析和表征研究。     

天然气置换后铸铁管承插接口漏气对策

分析了天然气置换人工煤气后铸铁管道承插接口漏气原理,介绍了4种解决方案:管道更换、PE管内衬、接口修补及燃气加湿,对其进行了技术经济比较。