高速重负荷(80m/s、300kgf)钢坯修磨的试验研究

对80m/s高速重负荷钢坯修磨中的几个有关问题进行了试验研究,表明对1Cr(?)8Ni9Ti和60Si2Mn钢坯修磨都收到较好的效果,80m/s高速重负荷修磨能够获得较高的金属去除率,还能相应地提高磨削比和降低比磨削能,是提高修磨效率并降低修磨成本的一种先进工艺,同时也是我国钢坯修磨技术的发展方向,文中提出了修磨功率计算式,可供设计新型80m/s修磨机床选定主电机功率时参考。     

含锆微合金钢焊接区针状铁素体形成观察

借助Gleeble-2000热模拟试验机和TEM对Zr,Zr＋Ti处理试验钢焊接粗晶区中针状铁素体的形核进行了观察。结果表明，Zr和Ti的氧化物都能够作为焊接粗晶热影响区中针状铁素体形核的核心，在提高针状铁素体数量方面，Ti的氧化物比Zr的氧化物更为有效。     

Study of Treating HAPE with HBO in Situ at the Altitude of 4636 m

Study Objective ： To evaluate the treatment effect of HAPE with HBO in situ at an extreme altitude of 4636 m. To investigate the relationship between pulmonary hypertension （PH） and HAPE. To emphasize the importance of the treatment in situ. Methods： The 32 patients from the plateau of 4636 - 5130 m （the barometric pressure： 57.41 - 53.28 kPa/431.6 - 400.6 mmHg（1 mmHg = 133.3224 Pa）, the partial pressure of oxygen： 12.0 - 11.6 kPa/90.0 - 87.0 mmHg） were treated in situ of 4636 m altitude with HBO. Before and after the treatment, the clinical symptoms / signs, radiographic evidence, SaO2, and MPAP were compared. Results： The clinical symptoms/signs, and all the targets of the patients were improved dramatically （p 〈 0.001）. Conclusions： Treating HAPE with HBO is the most effective method among various therapies in situ at an extreme altitude. The pulmonary -artery pressure was significantly decreased. All eases showed improved immediately. Among the subjects, 11 eases （34.3 %） were cured at once. The therapy made it possible for patients to get further treatment at a lower altitude area with prospective good results. We suggested that treating HAPE with HBO should be the first choice in situ. There must be PH in the patients of HAPE, but the reverse is not the true. The PH is a mechanism of normal compensation of the body exposing in the hypoxie environment. It is very necessary for us to explore the threshold of PH when a HAPE happens.     

利用物理悖论及其思想优化高中物理教学

通过阐述悖论的内涵及其在物理学发展中的作用，分析了物理悖论的种种教学价值．基于高中学生的认知发展和个性心理发展特征，提倡在高中物理教学中适当采用“导致悖论法”教学，优化高中物理教学效果，并对如何实施提出了参考性建议．     

大直径钢管混凝土施工技术

介绍安徽宁国水泥厂1000t/d熟料生产线钢管混凝土结构的设计与施工,以及高位抛落振捣法控制管内混凝土质量的经验,实现了钢管混凝土施工的创新与突破。     

二十辊轧机轧制薄钢带表面横纹研究

本文对二十辊轧机轧制薄钢带表面出现横纹问题进行了研究。只通过改变轧制工艺,薄钢带表面纹横不能明显好转,因此,通过在线监测、信号处理及频谱分析后确认:钢带表面横纹由轧辊颤振所造成,振源主要为电源谐波,其次是齿轮质量的影响。为此提出了解决方案。方案实施后,钢带表面横纹消除。     

RP-HPLC测定家犬血浆中维生素E的含量

目的:建立家犬血浆中维生素E(VitaminE,VitE)测定的高效液相色谱法,并进行VitE在家犬体内代谢的初步研究.方法血浆样品用乙醇沉淀蛋白,用正己烷提取浓集后进样;流动相为甲醇,检测波长为284nm,流速1.5ml·min-1.结果在此色谱条件下,VitE峰形良好,血浆内源性成分对药物测定无干扰;血药浓度在0.286-10.54μg·mL-1范围内,浓度与峰面积有良好的线性关系,r=0.9992;方法回收率>94%(n=3),日内精密度和日间精密度的RSD<5%(n=5).结论该法灵敏、简便、准确,适用于VitE在家犬体内的药代动力学研究.     

变p值二叉树形冲突分解算法分析

 提出了一种二叉树形冲突分解的改进算法,通过对随机争用多址访问系统中的信息分组冲突分解的研究,给出了冲突信息分组平均分解次数的解析式和系统吞吐量的解析式,仿真实验表明,仿真实现结果与理论值相吻合.     

Development of Polymer Electrolyte Membranes for High Temperature PEFCs

1 Introduction During the last decades the research has been devoted to the development of non-perfluorinated polymers[1,2], as an alternative to commercial perfluorosulphonic membranes. There are several non-perfluorinated materials suitable for these systems that should have as a fundamental requirement a good thermal stability of the original polymer. The studied polymers consist of polyaromatic or polyetherocyclic repeat units like polyetheretherketone (PEEK). Many papers have been published about t...     

多孔高强度沸石颗粒的制取及对铅离子的交换性能

本文以实验为基础，提出了用天然沸石粉和锯末粉为原料制取多孔高强度沸石颗粒，并将其对铅离子的交换性能进行了初步探讨。