适用于稠油开采的游梁式抽油机设计分析

在稠油开采中,抽油杆在液体中运动时,所受到的摩擦阻尼力很大,有时高达几十千牛。上冲程时,该力有加大悬点载荷的作用;下冲程时,该力使抽油杆下行困难,甚至悬点载荷为零。为了开采稠油,必须根据其特点设计适应的游梁式抽油机。文章分析了稠油用抽油机的受力特点,提出了该类抽油机的设计要求。     

钢丝绳抽油杆抽油超冲程分析

通过对钢丝绳抽油杆和常规钢杆振动模型固有频率的分析，从理论上分析了钢丝绳抽油杆和常规钢杆振动形成谐振(超冲程)的奈件；同时讨论了振动阻尼系数对共振的影响关系，从理论上得出了钢丝绳抽油杆在抽油时更易形成超冲程，进而从理论上解释了钢丝绳抽油杆在抽油过程中的泵效较高的事实，进一步解释了当前人们对钢丝绳应用和研究中的一些疑点和难点，为钢丝绳抽油系统的设计和应用提供了重要的理论指导。     

Influence of electroosmotic treatment on the hydro-mechanical behaviour of clayey silts: preliminary experimental results

Preliminary results of an investigation focused on the influence of electrokinetic treatment on the mechanical and hydraulic behaviour of clayey soils are presented. The experimental programme aims at providing a contribution to the sustainability of contaminant extraction or containment via electroosmosis. Changes in the hydraulic and mechanical properties of two illitic clayey soils, subjected to a DC electric field, were investigated. Samples of the two soils were subjected to electrokinetic filtration, for different periods of time, and under different constant loads. Afterwards, they were tested under one-dimensional compression to detect changes in stiffness and hydraulic conductivity due to the electrical treatment. After the application of a DC field for a few hours, a small reversible increment in the average soil stiffness was observed, with respect to the untreated soil, while the hydraulic conductivity was not affected substantially. Dramatic changes of the mechanical and hydraulic soil properties, correlated to changes of the soil pH, were observed following non-conditioned electrokinetic treatment with duration of the order of days.     

Cost effectiveness of decentralized energy supply systems taking solar and wind utilization plants into account

In this article, results are presented of annual simulations of a decentralized (regional) plant for the power and heat supply of a residential complex. This complex consists of four houses with 40 flats all in all. The annual power consumption of the complex is 157 MWh and the heat requirement is 325 MWh. The concrete dynamics of the energy demands over the year is taken into consideration. The energy supply system is composed of a power-controlled combined heat and power (CHP) plant (55 kW), a photovoltaic plant (PV array or PV plant) array for power generation as well as a field of solar thermal collectors with a short-term accumulator for water heating and a long-term accumulator for supplying heat for domestic heating purposes. Simulation results demonstrate that synergetic effects result from the combination of a CHP plant with wind power and PV plants of varying sizes, which have an effect on the cost effectiveness of the plant as a whole with the different dynamics of energy sources (wind and solar energies) and of the consumption of power and heat being the decisive factors. The power deficits of wind power and PV plants are compensated through the application of a natural gas-operated CHP plant. In almost all variants, the demand for fossil energy carriers is distinctly less than in conventional energy supply plants.     

Diamino telechelic polybutadienes for solventless styrene-butadiene-styrene (SBS) triblock copolymer formation

High molecular weight, high functionality diamino telechelic polybutadienes (TPBs) were synthesized by ring-opening metathesis polymerization (ROMP) of 1,5-cyclooctadiene (COD) in the presence of a chain transfer agent, 1,8-dicyano-4-octene, followed by lithium aluminum hydride reduction. Melt coupling of diamino TPB with anhydride-terminated polystyrene (PS-anh) resulted in the formation of styrene-butadiene-styrene (SBS) triblock copolymers; ca. 80% maximum conversion of PS-anh was achieved within 30 s. The results from SAXS, TEM, and rheological measurements of the coupling products confirmed the formation of SBS triblock copolymers having lamellar morphology. A fluorescent-labeled PS-anh was used to study the coupling kinetics by diluting the reactants by the addition of non-functional PS.     

流体在环形狭缝中流动时园柱体的微振动

本文讨论了在两个园柱体的环形狭缝中不可压缩流体的流动．在一定的假设下，运用流体力学方程和流体对柱体的作用方程，导出了附加质量和转动惯量、振动频率和衰减系数．并对文（１）中的某些结果进行了必要的修正．     

Recent investigations on some cubic Laves phase compounds of rare earth and transition metals

Pseudobinary alloy, Tb_0·27Dy_0·73Fe_2−δ , belonging to C-15 cubic Laves phase having MgCu₂-type structure, possesses large magnetostriction and high magnetomechanical coupling coefficient. The advantages of this material over existing piezoelectric materials, particularly for SONAR applications, are highlighted. Recent results on the influence of cobalt (Co) on magnetic and magnetomechanical properties of Tb_0·27Dy_0·73Fe₂ are discussed.     

自聚焦透镜用于端泵浦DPL的耦合光学系统

本文用自聚焦透镜耦合ＬＤ输出，解决了需要短焦距、大数值孔径透镜的设计和制方面的困难。提出了计算自聚焦透镜耦合效率的简化模型。用自聚焦透镜和一对正交柱面透镜设计了一个耦合系统，并用该耦合系统端泵浦Ｎｄ：ＹＡＧ棒做了实验。     

Σ-Δ过抽样转换器使用中的注意事项

为了充分发挥Σ Δ过抽样转换器的能力以获得最佳的系统性能 ,文章在分析直流电压、时钟抖动及电源的杂波等诸多因素对其影响的基础上 ,提出了适于Σ Δ过抽样转换器工作的最佳条件 ,对Σ Δ过抽样转换器系统的设计制作与调试有一定的指导意义     

甲烷和乙烷共同转化制乙烯的研究

甲烷和乙烷可以同时在Ｗ－Ｍｎ／ＳｉＯ２催化剂上得到活化生成乙烯。原料乙烷和甲烷体积比在０．１１～０．２５的范围内，当甲烷转化率为２０％左右时，共进料反应产物中乙烯体积浓度为８％～１２％，达到炼油厂催化裂化干气中乙烯的浓度。