基础水平位移对输电塔受力影响及其限值研究

运用有限元分析软件,建立桩-土-输电塔有限元耦合模型,基于输电塔杆件破坏失效准则,考虑不同基础组合工况,研究基础水平位移变化对输电塔受力影响规律,提出基础桩顶位移限值。研究结果表明,基础水平位移对输电塔塔腿杆件内力影响较大,线弹性阶段,杆件内力与基础水平位移呈线性关系;考虑杆件应力和破坏准则,得到两个典型基础桩顶水平位移限值为42 mm和69 mm。本研究可为输电塔基础设计提供指导。     

低温原油破乳剂AR-110的研制与应用

AR—110原油破乳剂是以原油低温快速脱水为目的而研制的，该破乳剂以烷基酚醛树脂为起始剂与环氧丙烷、环氧乙烷聚合成不同分子量的两种聚醚，再按一定比例复配而成，是低温、快速脱水的一种树脂型、水溶性破乳剂。本文介绍了AR-110原油破乳剂的研制与现场应用情况。     

Study on the properties of a ε-Fe3N-based magnetic lubricant prepared by DBD plasma

The ε-Fe₃N-based magnetic lubricant which is stable and high saturation magnetization has been prepared by a homemade DBD device under the atmospheric pressure. The results show that the NH3 flow rate, the applied peak-to-peak voltage and the mass ratio of surfactant and carrier lubricant have important effects on the phase structure, the magnetic properties, the size of ferroparticles and the stability of the ε-Fe3N-based magnetic lubricant. TEM images show the ε-Fe₃N ferroparticles are dispersed in the carrier lubricant homogeneously, and the cluster phenomenon is not observed. The stable ε-Fe3N-based magnetic lubricant with the saturation magnetization of 50.11 mT and the mean ferroparticle size of 11 nm is prepared successfully. The main particles of the atmospheric-pressure Ar/NH3/Fe(CO)5 DBD plasma are NH, N, N⁺, Fe, N₂, Ar, H_α, and CO; NH is a decomposition product of NH₃. Fe and N active radicals are two elementary species in the preparation of the ε-Fe3N-based magnetic lubricant in the atmospheric-pressure DBD plasma. There are two discharge modes for DBD plasma, namely, multi-pulse APGD and filamentary discharge. By increasing the applied peak-to-peak voltage from 4600 to 7800 V, the discharge mode is changed from single-pulse APGD with filamentary discharge to two-pulse APGD with filamentary discharge, and the Lissajous figure also converts from a quadrilateral with one step to two steps on the right-hand side.     

低密度台阶形闪耀光栅的制作

介绍了制作低密度闪耀光栅的过程,在制作时,对传统的制作过程进行了改进,有效提高了制作质量。以40μm闪耀光栅为例介绍了制作的过程,得到了良好的光栅表面形貌,并且闪耀级次的衍射效率达到了70%以上。相比传统的制作方法,效率提高了5%～10%。对比了理论上的衍射效率,分析了实验误差,发现把存在对准误差的光栅进行处理将会有效地提高其衍射效率,为进一步提高闪耀光栅的衍射效率提供了依据。     

封面图片说明

正等离子喷涂作为一类重要的材料表面强化及损伤修复技术,已逐渐形成了封严、绝缘、防污、耐磨损、耐腐蚀、耐高温、隐身吸波等多种涂层体系,在机械零部件的设计制造及再制造中具有广泛的应用前景。微观上来看,等离子喷涂涂层是由大量扁平粒子粘接成片,堆垛成层所形成的。因此,     

老院子的重生之路——天水忠义巷47号院改扩建手记

本项目缘起于天水西关古城的保护与复兴规划,是基于此规划的实践和示范。通过大量考据,还原历史院落信息,设计中力求传承历史元素,同时也基于现代使用需求,重新划分功能空间。结合"秦州八景",创造出了有历史韵味的空间效果。     

音视频数据采集接口电路设计及实现

针对普通缓存器存储溢出或者读空的问题，对音视频数据采集系统的接口电路进行了设计和实现。该接口电路可实现压缩后的音频和视频数据的FPGA缓存和PCI总线传输。利用乒乓操作的方法控制缓存器的切换，以保证数据的无缝传输。仿真试验结果表明，所设计的接口电路，其准确性和稳定性均满足项目要求，且具有较好的工程使用价值。     

1-(1,3-噻唑啉-2-基)-3-巯基氮杂环丁烷盐酸盐的工艺研究

以2-巯基-2-噻唑啉为起始原料,经过甲基化、与3-羟基氮杂环丁烷盐酸盐发生亲核取代SN2、甲磺酰氯活化羟基、与硫代乙酸钾发生亲核取代SN2、碱性水解5个反应步骤,合成目标产物,总收率51.6％,HPLC纯度98.5％.各中间体及终产品通过熔点、IR、1HNMR、MS等手段进行了结构确证.该方法反应条件温和、操作简便、...     

Parameter Optimization for Enhancement of Ethanol Yield by Atmospheric Pressure DBD-TreatedSaccharomyces cerevisiae简

In this study, Saccharomyces cerevisiae （S. cerevisiae） was exposed to dielectric barrier discharge plasma （DBD） to improve its ethanol production capacity during fermenta- tion. Response surface methodology （RSM） was used to optimize the discharge-associated pa- rameters of DBD for the purpose of maximizing the ethanol yield achieved by DBD-treated S. cerevisiae. According to single factor experiments, a mathematical model was established using Box-Behnken central composite experiment design, with plasma exposure time, power supply volt- age, and exposed-sample volume as impact factors and ethanol yield as the response. This was followed by response surface analysis. Optimal experimental parameters for plasma discharge- induced enhancement in ethanol yield were plasma exposure time of 1 rain, power voltage of 26 V, and an exposed sample volume of 9 mL. Under these conditions, the resulting yield of ethanol was 0.48 g/g, representing an increase of 33% over control.