Mechanical properties of iron processed by severe plastic deformation

In the present study, the mechanical properties of Fe processed via severe plastic deformation (equal-channel angular pressing (ECAP)) at room temperature were investigated for the first time. The grain size of annealed Fe, with an initial grain size of about 200 μm, was reduced drastically during ECAP. After eight passes, the grain size reaches 200 to 400 nm, as documented by means of transmission electron microscopy (TEM). The value of microhardness during pressing increases 3 times over that of the starting material after the first pass and increases slightly during subsequent pressing for higher-purity Fe. Examination of the value of microhardness after eight passes as a function of post-ECAP annealing temperature shows a transition from recovery to recrystallization, an observation that resembles the behavior reported for heavily deformed metals and alloys. The tensile and compression behaviors were examined. In tension, a drop in the engineering stress-engineering strain curve beyond maximum load was observed both in the annealed Fe and the ECAP Fe. This drop is related to the neck deformation. The fracture surface, examined by scanning electron microscopy (SEM), shows vein patterns, which is different from the dimples found on the fracture surface of annealed Fe. In compression, an initial strain-hardening region followed by a no-strain-hardening region was observed in the ECAP Fe. The yield strength in tension of the ECAP Fe was observed to be higher than that in compression. The strengthening mechanisms and softening behavior are discussed.     

长庆油田苏平1井固井技术研究与应用

苏平l井完井方式运用了技术套管一次上返、悬挂尾管和筛管技术。该井技术套管段井眼大、裸眼段长，加上大斜度、小间隙的尾管段．对水泥浆体系的性能要求较高。总结分析了长庆天然气水平井苏平l井的固井技术问题，介绍了苏平l井的井身结构与地层性质。通过研究．确定采用低失水GSJ水泥浆体系。该体系成功地应用在三次工程建井过程中，解决了长裸眼、大灰量、大斜度、尾管小间隙等固井技术问题。固井质量达到工程要求。     

基于模糊信息处理的中板轧机微机在线监测系统

中板轧机是中板厂最重要的生产设备，对其工况进行在线监测意义重大，各种传感器将轧机的工况信息传送给微机系统，微机系统将这些信息进行模糊处理，发出相关信息，指导系统安全，高效运行。     

煤粉粒度对高炉风口前燃烧性能的影响

安钢炼铁厂在喷吹瘦煤后，将小于0．074mm的比例由70％放宽到30％，使磨煤能力提高了21％。采用自行设计的风口取样器，研究了风口前气体成分和煤粉燃烧率的变化。当煤粉粒度变粗后，风口前循环区变长，放宽煤粉粒度与高富氧、高风温配合，能使高炉得到较好的经济效益。     

基于B/S和C/S的高中校园一卡通系统

结合广东潮州高级中学的实际情况,介绍了高中校园一卡通系统的设计和应用.     

液晶电控效应的实验研究

详细阐述了液晶的电光效应,介绍了利用分光光度计测量液晶透射比的方法。通过改变加在液晶盒上的电压大小及其频率高低,详细测量了液晶的透射比。通过做图分析了液晶的电控双折射效应,得出液晶的透射比随所加电压的大小和频率的高低而变化,以及液晶的阈值电压随频率的增高而减小的规律,这对液晶器件的设计与研究均具有一定的参考价值。     

PRO——一种新的地震资料处理方法

PRO(影像的参数展开)技术是由俄罗斯地球物理学家开发的一种崭新的地震资料处理技术。本文从PRO基本原理入手,简单介绍了PRO的速度分析原理。PRO速度分析和成像均以信号的椭圆展开和参数展开为基础,其中参数展开方法考虑波型转换、介质的横向不均匀造成传播速度的变化。该技术抛开了传统共中心点叠加的思想,从根本上解决了以CMP方法为基础的传统地震处理技术遇到的困难。通过模型与实例分析对比,PRO比传统CMP方法更优越。     

Bioeffects of Low Energy Ion-Beam Implantation and Vacuum Treatment on M1 Arabidopsis Thaliana

Vacuum treatment and ion-beam bombardment are two major processes in the low energy ion-beam implantation. To accurately study the contributions of these two major factors to the bioeffects separately, the M1 generation variation of Arabidopsis thaliana with ion-beam implantation and vacuum treatment were compared through a series of key plant development parameters including morphological observation, biochemical assay and RAPD （random amplified polymorphic DNA） analysis. The results showed that ion-beam implantation had obvious effect on almost all of these parameters, and the vacuum treatment had some impacts on several morphological parameters such as the bolting time and the length of the primary stem. Taking the results together, the indication is that vacuum treatment has some slight contributions to the bioeffects of ion-beam implantation while ion-beam bombardment itself is the major creator of the bioeffects.     

陶瓷行业推行ISO14000探析

大力推行ISO14000系列标准已成为我国陶瓷企业适应加入WTO后新的竞争形式，参与国际绿色贸易的有力武器。本文根据我国陶瓷企业的现状，分析了在陶瓷行业推行ISO14000系列标准工作中所存在的问题，提出了在我国陶瓷行业广泛推行ISO14000系列标准的对策和建议。     

穿壁焊极柱合金探索

本文对起动用铅酸蓄电池穿壁焊极柱用合金配方进行了探索 ,并得到了良好的应用效果