高速精密加工工具系统现状与探讨

综述了新型工具系统的发展过程、特点及应用情况 ,着重分析了HSK工具系统的刚度和承载能力、夹紧力、动平衡、测量技术、材料和热处理等几个关键问题 ,指出了尚待解决的一些重要问题 ,提出了今后研究的途径以及我国开发高速加工工具系统时应采取的策略。     

Isolation and Functional Characterization of a Salt-Responsive Calmodulin-Like Gene MpCML40 from Semi-Mangrove Millettia pinnata

Salt stress is a major increasing threat to global agriculture. Pongamia (Millettia pinnata), a semi-mangrove, is a good model to study the molecular mechanism of plant adaptation to the saline environment. Calcium signaling pathways play critical roles in the model plants such as Arabidopsis in responding to salt stress, but little is known about their function in Pongamia. Here, we have isolated and characterized a salt-responsive MpCML40, a calmodulin-like (CML) gene from Pongamia. MpCML40 protein has 140 amino acids and is homologous with Arabidopsis AtCML40. MpCML40 contains four EF-hand motifs and a bipartite NLS (Nuclear Localization Signal) and localizes both at the plasma membrane and in the nucleus. MpCML40 was highly induced after salt treatment, especially in Pongamia roots. Heterologous expression of MpCML40 in yeast cells improved their salt tolerance. The 35S::MpCML40 transgenic Arabidopsis highly enhanced seed germination rate and root length under salt and osmotic stresses. The transgenic plants had a higher level of proline and a lower level of MDA (malondialdehyde) under normal and stress conditions, which suggested that heterologous expression of MpCML40 contributed to proline accumulation to improve salt tolerance and protect plants from the ROS (reactive oxygen species) destructive effects. Furthermore, we did not observe any measurable discrepancies in the development and growth between the transgenic plants and wild-type plants under normal growth conditions. Our results suggest that MpCML40 is an important positive regulator in response to salt stress and of potential application in producing salt-tolerant crops.     

水压环形缝隙泄漏量的试验研究

在水压系统环形缝隙泄漏试验基础上，对圆柱形配合状态下的缝隙泄漏量进行了理论和试验对比研究，分析了两者的变化规律。得出的结果可以为水压元件的设计提供试验依据。     

Water‐absorptive blend fibers of copoly(acrylic acid–acrylamide) and poly(vinyl alcohol)

Through the addition of N‐hydroxymethyl acrylamide as a potential crosslinker, water‐absorptive blend fibers of copoly(acrylic acid–acrylamide) and poly(vinyl alcohol) with three‐dimensional network structures were prepared with heat‐crosslinking technology after fiber formation. Fourier transform infrared, scanning electron microscopy, dynamic mechanical analysis, and thermogravimetry were used to analyze the structures and properties of the fibers. The tensile behavior and absorbent capacities of the fibers were also studied. The results showed that there were lots of chemical crosslinking points in the fibers, the compatibility of copoly(acrylic acid–acrylamide) and poly(vinyl alcohol) was perfect, and the tensile properties of the fibers could be improved effectively through stretching in a vapor bath. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3353–3357, 2006     

陶瓷用无机抗菌剂

介绍了陶瓷用无机抗菌剂的种类,还着重介绍了专利产品、全新的、不含银无机抗菌剂的特点,以及抗菌剂本身毒理检测结果和抗菌产品抗菌功能检测结果等。     

勉县地质灾害分布与影响因素的相关性分析

受水文地质、工程地质条件及人类工程活动等影响因素的影响,勉县是陕南地区地质灾害的多发区。为了研究勉县地质灾害分布与影响因素之间的相关性,分别绘制了各影响因素与地质灾害分布的叠加图,并对其进行统计分析。得出结论:勉县地质灾害集中发育于汉江盆地年平均降雨量为850mm~900 mm的区域、中低山区和丘陵区以及志留系-奥陶系下统和侏罗系地层岩性区。地质灾害沿主要水系、断裂、公路等两侧一定范围内呈"带状"分布。汉江两侧1 km范围内灾害点最多,灾害点密度最大;勉县—略阳构造带两侧1 km范围内灾害点最多,灾害点密度最大;十天高速两侧1 km范围内灾害点最多,灾害点密度最大。分析结论为勉县移民搬迁项目和基础设施建设提供可靠的地质灾害防治依据。     

PTC型BaTiO3陶瓷的孪晶和孪晶界

用透射电镜和高分辨电镜观察研究了PTC型BaTiO_3陶瓷的孪晶和孪晶界结构,并提出了可能的{111}孪晶及孪晶界的原子结构模型。结果表明,{111}孪晶形成氧八面体共面的共格倾斜孪晶界,在孪晶界处可能存在一定量的A空位且原子密度要低于孪晶体内。同时还发现两种其它特征的孪晶现象。     

关联维数在往复压缩机气阀故障诊断中的应用

针对传统方法难以有效进行往复压缩机气阀故障诊断的现状,提出了应用关联维数对往复压缩机气阀故障进行诊断的方法。通过对气阀常见故障类型的诊断,表明关联维数可以有效地分析出往复压缩机气阀的常见故障。     

汽液平衡计算与立方型状态方程

本文综述应用于汽液平衡计算的立方型状态方程的发展和研究动向。     

长江三峡特色旅游资源开发研究

分析长江三峡的特色旅游资源,指出开发中存在特色品牌不"特"、文化气息不"浓"、特色观念不"新"、市场定位不"清"等问题,提出了相应的对策,以增强长江三峡特色旅游的吸引力及综合竞争力.