PDC钻井岩屑成像识别分析技术在洛带气田的应用与改进

为了解决四川盆地致密砂岩气藏PDC钻井条件下岩性识别的技术难题,西南地质录井分公司首次引进了岩屑数码成像分析仪,以四川盆地洛带气田浅层蓬莱镇组和遂宁组为研究对象,通过室内试验发现该分析仪的岩屑数码成像分析技术存在4个方面的问题;通过将常规的显微目镜放大、数码成像的方式改进为电镜逐行线性扫描放大成像方式和建立该区域不同岩性的计算机识别模板,解决了在该区致密砂岩气藏中的应用问题。在洛带气田浅层遂宁组致密砂岩层4口井的应用结果表明,随钻岩性剖面与测井解释剖面吻合率达到了90％以上。     

动态压缩LY12铝合金微结构的XRD线形分析

用Hopkinson杆实验装置在不同温度下对LY12铝合金进行动态压缩实验.采用XRD线形分析对压缩试样的微细观结构演化进行研究.由XRD的积分宽度确定试样中位错为刃型位错.衍射峰形的Fourier分析表明,在动态加载下,材料内部的位错密度在塑性流动的初期迅速趋于饱和,且随着测试温发的升高,位错密度呈递减趋势,同时亚结构的尺寸不断增加.衍射峰形分析结果显示在280—300℃之间亚结构尺寸迅速增长,与LY12铝合金在280℃附近发生第:相粒子的溶解对应.     

Design and Modeling on Stranded Wires Helical Springs

A stranded wires helical spring is formed of a multilayer and coaxial strand of several wires twisted together with the same direction of spiral. Compared with the conventional single wire spring, the stranded wires helical spring has the notable predominance in strength, damping and vibration reduction, which is usually used in aircraft engines, automatic weapons, etc. However, due to its complicated structure, the precise computation of its strength and rigidity need be a correct mathematical model, which then will be imported to finite element analysis software for solutions. Equations on solving geometric parameters, such as external diameters of strands and screw pitches of wires, are put forward in the paper. It also proposes a novel methodology on solving geometric parameters and establishing entity models of the stranded wires helical spring, which provides foundation of computing mechanical parameters by FEA. Then mathematical models on the centre line of the strand and the surface curve of each wire, after closing two ends in a spring, are proposed. Finally, geometric parameters are solved in a case study, and a 3D entity model of a spring with 3 layers and 16 wires is established, which has validated the accuracy of the proposed methodology and the 3D entity mathematical model. The method provides a new way to design stranded wire helical spring.     

2024-T3和2524-T34铝合金疲劳裂纹的萌生机制

通过2024-T3和新型2524-T34铝合金的疲劳实验和对试样表面及疲劳断口的观测,研究了材料的微观结构和疲劳裂纹萌生机制.实验在室温下完成,应力比为0.1、加载频率为15 Hz.结果表明:实验材料呈现了再结晶的层状晶粒结构,晶粒沿着轧制方向被拉长,并较为平坦.2024铝合金中二相粒子的分布更为密集无序,且粗大、不规...     

饱和吸附铀的717#树脂聚合物固化研究

以苯乙烯为单体，二乙烯苯为交联剂，偶氮二异丁腈为引发剂，研究了聚合固化吸附铀达到饱和的717#树脂的可能性，确定了在常温常压下进行固化的工艺条件，并对聚苯乙烯固化体进行了性能测试。     

单通激光片状放大器的模拟计算分析

介绍了高功率固体激光驱动器中单通片状放大器 (SSA)的模拟和实验研究结果。对放大器能量传输的各环节进行全系统模拟 ,在能源系统优化的前提下 ,对不同抽运条件和不同抽运腔构型放大器的增益特性进行实验研究 ,2 2kV工作电压下 ,获得了 4 9%cm-1的小信号增益系数和 2 4 3%的储能效率。同时还分析了放大器的抽运热畸变及波前变化 ,实验测量了由抽运引起的腔内洁净度变化情况。     

Establishing an Employment-oriented Curriculum in Urban Planning

1. China’s need for urban planners Urban planning education in China can be classified into four categories according to disciplinary background; architecture, engineering, science, and forestry①②.     

软磁铁氧体材料的应用与市场

简要介绍了软磁铁氧体材料的应用范围，并对２０００年前国际，国内市场的发展趋势作了预测。     

Numerical Simulation on the Flow Field of a Four-channel Coal Burner

In this paper,the numerical simulation on the flow field of a four-channel coal burner was investigated with Fluent software.The three-dimension model was created with UG software.The structure was meshed by using Gambit software.The realizable κ-ε turbulence model and simple method were adopted.The variation of the inner flow field of the burner was studied and analyzed.The results simulated to the burner by the realizable κ-ε turbulence model show that the contours of the flow field accord with the actual...     

Research into tritium and helium-3 contents distributions in steel wall of spherical pressure vessel

The tritium quantity stored in a steel pressure vessel decreases with time because of helium-3 decay and permeation of tritium into the steel wall of the pressure vessel.Meanwhile,the tritium quantity permeating into the steel wall also decreases with time due to helium-3 decay and diffusion in and out of the wall of tritium.Tritium and helium-3 in the steel wall will cause hydrogen and helium embrittlement of the wall material,respectively,and thereby change the carrying capacity of the vessel.Taking conte...