钢纤维混凝土轴拉应力-应变特性的试验研究

本文采用环氧粘接法对4种纤维混凝土材料进行了轴向拉伸试验，成功地获得了材料的应力-应变全曲线。根据其试验曲线是否出现第二峰值，把纤维分为增强与增韧两大类。通过分析表明：不同的纤维形式对混凝土材料的作用机理有较大的差异。在工程应用中，应根据纤维混凝土材料的用途来选择纤维类型。     

Paste Residence Time in a Spouted Bed Dryer. III: Effect of Paste Properties and Quality Interactions

The aim of this study was to evaluate the effects of paste properties on residence time during drying in a spouted bed dryer with inert bodies. The effect of paste solids content, surface tension, and viscosity on the residence time distribution and the mean residence times were studied using factorial experimental designs. The inert bodies used were glass and polyethylene beads. The mean residence times varied from 13.6 to 16.3 and 12.2 to 17.7 min for drying on glass and polyethylene beads, respectively. The analysis of variance showed that mean residence times significantly depended on solids content and surface tension for glass beads and also on viscosity for polyethylene beads. The residence time distributions for all conditions studied fitted well to the perfect mixing cell when applying the continuous stirred vessels in series model analysis. The powder density, flowability, and particle size depended on paste properties and inert type.     

大港油田官109-1断块稠油油藏碱/表面活性剂吞吐采油技术

大港油田官109-1断块稠油油藏的油井由于井筒、近井地带发生原油有机沉积,储层原油流动性差,采用多种方法都不能正常生产。为此研制了一种碱性解堵液,用于油井化学吞吐。该解堵液为复配碱和抗硬剂等添加剂的10%两性木质素表面活性剂溶液,能使玻璃片表面由亲油变强亲水,在石英上的接触角为6°(稀释至1/2和1/4浓度时为11°和12°),与羊大站原油间的界面张力为1.75×10-3~3.18×10-3mN/m。该解堵液与黏度1~50 Pa.s的不同区块稠油按体积比1∶1混合形成的乳状液,60℃、175 s-1黏度为2~6 mPa.s,在配液水矿化度高达6000mg/L以上或钙镁离子浓度高达250 mg/L时,该解堵液仍能保持对稠油的乳化降黏能力。该解堵液从实验岩心中驱出的原油量比地层水多75%,驱出液为乳状液。通过一个井例介绍了化学吞吐工艺:先用一种降黏解堵液对油井进行预处理,清洗油管、炮眼及近井地带,再注入碱性解堵液(该井例中为500 m3),注入时间约15小时,然后开井生产。2000年2月至2002年6月在16口新投产井实施化学吞吐(第一轮次),15口井有效,其中2口井先后转注水,其余13口井到2005年底仍继续产油。图1表6参5。     

精密铜带圆盘纵剪机

通过对精密铜带圆盘剪切机的工作原理和工艺过程进行研究，对引进的美国剪切机进行了技术改造，设计制作了新的装置，实现了软态铜带的剪切。     

A new curvature technique calculation for surface tension contribution in PLIC-VOF method

The volume of fluid (VOF) methods have been used for numerous numerical simulations. Among these techniques used to define the moving interface, the piecewise linear interface reconstruction (PLIC-VOF) is one of the most accurate. A study of the superficial tension impact on two-phase flow with free surface is presented. A new method based on direct staggered grid is developped to include surface tension in PLIC-VOF. The new numerical curvature calculation method doesn't need smoothed colour function and leads to less “spurious current”. This technique is applied to the calculus of surface tension force in the case of the rise of air bubble in viscous liquid and the fall of liquid drop in the same liquid on free surface. Droplets, thin layer and capillarity waves are observed after the free surface rupture for different Bond number. The influence of surface tension calculus is then obvioused and when the drop hit the free surface, wavelets propagate toward the virtual boundaries imposed.     

Synthesis and aqueous solution behaviors of sodium sulfonate‐terminated dendritic poly(ester‐amine)

Sodium sulfonate‐terminated dendritic poly(ester‐amine) (SPEA) was synthesized by sulfonation of acrylic double bond‐terminated dendritic poly(ester‐amine) (APEA) with sodium hydrogen sulfite (NaHSO₃) in mixture of diglycol and 2‐butanone under normal pressure. The structure of SPEA was characterized by IR, ¹H‐NMR, and elemental analysis. SPEA was water‐soluble. 1.0–40.0% (mass) SPEA aqueous solutions appeared as dilatant fluid. When pH value varied from 1.5 to 12.0, the viscosity of 1–5% (mass) SPEA aqueous solutions changed very small, and the electric conductivity almost kept stable within pH 3.0–10.0. The relationship between the viscosity and the concentration of SPEA water solutions was similar to that of NaCl water solutions. The surface tension of SPEA water solutions was lower than that of polyethylene glycol 2000 water solutions with the same concentration. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

A study on dynamic friction of different spun yarns

This article presents the results from a study of yarn-to-yarn (YY) and yarn-to-metal (YM) frictions conducted on ring, rotor, air-jet, and open-end friction (OE friction) spun yarns at different relative speeds and input tensions. The results indicate that the behavior of frictions for YY is different than that of YM. In case of YY friction, OE friction yarn shows maximum friction followed by rotor, air-jet, and ring spun yarns; however, a reverse order is noticed for YM friction. The relative speed and input tension have significant influence on the frictional behavior of spun yarns. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

带传动摆架式自动张紧装置的张紧力计算

基于带传动在稳定工作时的受力平衡，从理论上导出了摆架式自动张紧装置所产生的张紧力的计算公式。结果表明：只要合理选择计算安装参数，其张紧力总能满足张紧条件的要求，以对张紧装置进行设计计算；并指出该装置产生的张紧力，具有随外载荷变化而自动调节的性能，使传力零件部分卸载。     

An examination of the effect of composite constituent properties on the notched-strength performance of composite materials

The effect of matrix and fiber properties on the strengths and failure processes of notched, continuous-fiber composite specimens has been investigated. Bearing, open and filled hole tension and compression tests were conducted on AS-4/3501-6, IM-8/3501-6, AS-4/APC-2 and IM-8/APC-2 specimens. Failure characteristics of tested specimens were studied by fractographic techniques. Failure progression was tracked by means of incremental loading, radiography and fractographic inspection.     

太钢3号卷取机TDC控制系统开发与应用

太钢热连轧厂3号卷取机改造前所采用的美国西屋公司WDPF控制系统已不能满足目前生产和质量的要求，进而应用西门子公司的TDC控制系统对其进行了改造。该项目的设计、编程、调试由太钢自行完成，改造中采用了带钢头部张力优化控制、夹送辊张力控制、卷取机平滑曲线减张控制、卸卷小车横移极限升降极限模拟控制等多项新技术。其改造后产品产量、综合成卷率和卷形良好率均明显提高。