SECONDARY PHASES IN SPRAY DEPOSITED 2024-20Si-5Fe ALLOY

ＩＮＴＲＯＤＵＣＴＩＯＮＲａｐｉｄｓｏｌｉｄｉｆｉｃａｔｉｏｎ（ＲＳ）ｉｓａｎｅｗｔｅｃｈｎｏｌｏｇｙｔｏｐｒｅｐａｒｅｈｉｇｈｐｒｏｐｅｒｔｙａｌｏｙｓ，ｗｈｉｃｈｃａｎｅｘｔｅｎｄｔｈｅｓｏｌｉｄｓｏｌｕｂｉｌｉｔｙｌｉｍｉｔｏｆａｌｏｙ，ｓｕ...     

ELECTROREDUCTION OF Yb(Ⅲ) ON NICKEL CATHODE IN MOLTEN CHLORIDE

１ＩＮＴＲＯＤＵＣＴＩＯＮＹｂＮｉａｌｏｙｃａｎｂｅｕｓｅｄｔｏｍａｎｕｆａｃｔｕｒｅｆｕｎｃｔｉｏｎａｌｍａｔｅｒｉａｌｓ［１，２］．ＩｔｉｓｎｅｃｅｓａｒｙｔｏｓｔｕｄｙｔｈｅｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｂｅｈａｖｉｏｕｒｏｆＹｂ（Ⅲ）ｏｎＮ...     

指标综合筛选方法在高含水油田开发效果评价中的应用——以埕东油田为例

高含水油田开发效果评价涉及指标很多,为了能用较少的指标映射原来许多个指标才能包含的信息,依据逻辑分析、系统聚类和复相关分析等现代统计理论,借助SPSS统计软件和MATLAB数学软件等工具,通过逻辑分析方法构建了高含水油田开发效果评价指标体系.应用聚类分析对指标进行聚类,并以复相关分析求得的复相关系数为依据,确定了以剩余采油速度、含水上升率、综合递减率和含水率作为高含水期开发效果评价的典型指标.实践表明,评价效果较好.     

贮氢负极的电化学交流阻抗特性研究

通过试验测得金属氢化物电极的电化学交流阻抗谱（ＥＩＳ），经过分析得到该电极的等效电路图。为了分析电极在不同状态下的阻抗及不同种类电极的阻抗，ＥＩＳ被用于其分析：（１）不同带电态的电极；（２）不同集流体电极；（３）不同化成态的电极。试验结果表明：（１）随放电深度的增加，电荷传递阻抗Ｒ７有先减小后增大的趋势，温伯格阻抗对应电导逐渐减小；对此进行了理论分析；（２）泡沫镍在电极中起到的集流作用不一定明显优于冲孔镍带，但可能由于镍的电催化作用，能减小电极反应的电子转移步骤阻抗；（３）以充放电方式的电化学化成主要是减小电荷转移阻抗，而对温伯格阻抗无明显影响。     

CR—60型旧砂再生机除尘系统设计

介绍了ＣＲ－６０型旧砂再生机的除尘系统设计过程及工作参数计算．该系统结构紧凑、新颖，除尘性能优良、稳定，是中小型铸造车间旧砂再生的良好设备．     

干法浸渍过程模型的激波理论解及实验研究

本文探讨了干法浸渍过程中达到吸附平衡时，催化剂前体在球形截体内的浓度分布。对单组分浸渍于渗透－吸附模型提出了具有一般意义的边界条件，应用激波理论得到了浓度分布的解析解。实验测定了硝酸铜溶液－硅胶体系和模型参数及φ5毫米载体内的浓度分布。理论计算与实际分布基本吻合。     

新版FIDIC施工合同条件中明示和隐含的索赔规定

介绍国际咨询工程师联合会（FIDIC）1999年出版的施工合同条件中明示和隐含的索赔条款。     

EFFECT OF DRILLPIPE ROTATION ON BOREHOLE CLEANING FOR EXTENDED REACH WELL

Wellbore cleaning is a key technology for the Extended Reach Drilling (ERD). The success of drilling extended reach wells depends directly upon the quality of wellbore cleaning. The rotation of the drillpipe, and hydraulic and rheological parameters, are the key factors for wellbore cleaning. In this study, Computational Fluid Dynamics (CFD) is applied to simulate solid-liquid two-phase flows in wellbore annulus. The annual flow field with the presence of drillpipe rotation is described through analyzing various rotation conditions. The results indicate that the quasi-spiral flow is the main flow pattern for liquid-solid transport in the horizontal annulus. The influence of rotation on the cuttings transport is also investigated, as the rotation of drillpipe increases the disturbance of liquid to solid in annulus. As a result, the solid flow becomes favorable and the solid volume is reduced. Comparisons with previously published results are also performed to prove the importance of drillpipe rotation in the wellbore clearing for the ERD.     

An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades

In this short paper,we have treated the aerodynamic performance of micro downwind rotor with coning soft blades experimentally.The test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA0018 blades of 0.15 m chord whose material is light,soft and pliable foam plastic for perfect safety.From the wind tunnel test,it is realized that the performance is manageable by the coning angle of the rotor blade.In the present case,an improvement of the performance in lower wind speeds is achieved by...     

Research on forecasting model of sandstone deformation rate during sine wave loading segment under the lag effect

To reduce data variance caused by individual differences of different samples,a new experimental method is proposed by loading and unloading the axial forces with different frequencies and different waves of a certain load amplitude to the same rock sample without damaging it.Lag time segments are defined and fractionized into segments I and Ⅱ.Criterions for seg-mentation,definitions of relevant parameters and empirical analysis are also offered afterwards.In the course of sinusoidal loading,the serious pea...