内啮合齿轮泵的齿轮设计

本文介绍了内啮合齿轮泵齿轮设计的准则及应注意的几个问题。     

用化学法对20钢、纯Fe表面扩渗稀土元素的研究

稀土元素作为合金化元素或变质元素,通常通过熔炼或铸造时加入钢或合金中,而用扩渗的方法在钢和合金表面渗入稀土元素的研究则不多。近年来,我们用化学法、自配渗剂,在气相条件下对20钢、纯Fe表面进行扩渗稀土元素的研究工作。经离子探针、扫描电镜能谱分析、X射线荧光分析等测试,均证实了在20钢和纯Fe表面渗入了微量的Ce,La等稀土元素,这些元素优先沿晶界扩散,并富集于晶界。     

用热重法研究稀土对20钢碳氮共渗过程的催渗作用

本文用热重法研究了稀土元素对20钢表面碳氮共渗过程的催渗作用,考察了不同稀土加入量、不同温度对催渗动力学过程的影响。结果表明:共渗速度可提高20—25％;钢表面层碳氮浓度亦有所增加,而且碳氮原子渗入的同时稀土作为活性组元也渗入了钢表面,产生了微合金化效果。     

离心铸造不锈钢空心管坯裂纹缺陷的探讨

介绍了离心铸造1Cr18Ni9Ti钢管坯产生的裂纹形态;从理论上探讨了裂纹产生机理并提出了预防和消除裂纹的措施及较佳的铸造工艺参数。     

Induced effects of Cu underlayer on（111） orientation of Fe50 Mn50 thin films

Effects of Cu underlayer on the structure of Fe50 Mn50 films were studied. Samples with a structure of Fe50 Mn50 (200 nm)/Cu(tcu) were prepared by rnagnetron sputtering on thermally oxidized silicon substrates at room temperature. The thickness of Cu underlayer varied from 0 to 60 nm in the intervals of 10 nm. High-vacuum annealing treatments, at different temperatures of 200, 300 and 400℃ for 1 h, respectively, on the Fe50Mn50 (200 nm)/Cu(20 nm) thin films were performed. The surface morphologies and textures of the samples were measured by field emission scan electronic microscope (FE-SEM) and X-ray diffraction(XRD). Energy dispersive X-ray spectroscopy (EDX) and Auger electron spectroscopy(AES) were used to analyze the compositional distribution. It is found that Cu underlayer has an obvious induce effect on (111) orientation of Fe50 Mn50 thin films. The induce effects of Cu on (111) orientation of Fe50 Mn50 changed with the increase of Cu layer thickness and the best effect was obtained at the Cu layer thickness of 20 nm. High-vacuum annealing treatments cause the migration of Mn atoms towards surface of the film and interface between Cu layer and substrate. With the increasing annealing temperature, migration of Mn atoms is more obvious, which leads to a Fe-riched Fe-Mn alloy film.     

冒口重量网络图确定法

以圆柱和腰圆冒口为例，提出了坐标曲线网络图方法，根据已知的冒口尺寸即可由坐标曲线网络查取任一冒口重量。     

计算机网络技术对人工智能的应用

近年来,人工智能日益成为科学技术的前沿领域,世界各国也高度重视人工智能的发展。人工智能的发展离不开计算机网络技术。本文介绍了人工智能,分析了人工智能技术的优势以及在计算机网络技术中的应用。     

网购“星际2”必知的4件事

《星际争霸》在12年前推出时,凭借着超前的游戏理念和均衡的种族设计,引领了局域网对战游戏的潮流。如今,随着《星际争霸2》这款超一流游戏的推出,     

燃气表无线抄表系统的设计与实现

针对现在抄表系统复杂度高或成本高等问题,本文设计了一套燃气表无线抄表系统,从基本架构、主要功能、软硬件的实现加以说明,具有实时、可靠、经济、低功耗等优点.该系统采用M430F413和EM78P153S为控制单元,CC1100为无线通信单元.该系统稳定可靠,具有良好的应用和推广价值.     

C8051F单片机在自动机器人上的应用

以2007年CCTV大学生机器人大赛自动机器人为对象,系统阐述了自动机器人的控制电路.