吴川-四会断裂带大王山花岗岩早期韧性变形特征

大王山剪切带内出现一系列规模不等的糜棱岩条带,广泛发育S面理和C面理,还出现一系列次级拉伸折劈理、剪切条带和不对称小褶纹。剪切带中的石英、云母等基质矿物以塑性变形为主,出现动态重结晶、亚晶、波状消光等显微构造。长石主要以破裂和香肠化为主,出现粒内的张裂隙和肿缩构造。石英和长石存在明显的流变学差异。通过构造和显微构造特征判定,大王山剪切带为右旋剪切带。吴川-四会断裂曾经历过右旋韧性剪切作用。     

宽扁连系梁抗震性能的试验研究

本文进行了9个试件的试验,主要研究了宽扁连系的抗震性能.文中考虑了对其性能产生主要影响的几个变数.同时也提出了关于具体设计的一些建议.     

钢中贝氏体转变的开始温度Bs与转变驱动力

贝氏体转变开始的模式可表示为γ→γ′+γ_1→α′+γ_1,由此提出了计算贝氏体转变开始温度 B_s 的公式,B_s(x)=M_s(x′),x′=Ax+B(相似文献   

大王山剪切带中的石英组构特征

大王山剪切带中的石英c轴组构型式有三种:Ⅰ型有四个极密;Ⅱ型为大圆环带;Ⅲ型为过渡型。石英组构型式可判定石英内部变形机制为底面、柱面、菱面滑动。运用S-C组构,长石斑晶等应变标志进行应变测量,发现应变强弱对石英组构型式无明显影响。剪切带中石英c轴组构具不对称性,结合长石的不对称眼球、不对称的微褶皱、重结晶石英的斜列、碎裂矿物的移位等,可判定吴川—四会断裂早期经历过右旋韧性剪切。     

钢筋混凝土剪力墙的延性

本文根据“钢筋混凝土弹塑性抗震结构的机构控制理论”,研究了R.C.剪力墙的延性问题。分析了影响因素,指出改善剪力墙延性的关键在于提高连系梁的延性。根据连系梁的不同跨高比,提出两种人工塑性铰构造方案。试验分析表明,采用本方案可以避免连系梁产生剪切破坏和剪切滑移,延性较大。通过设计,可控制使结构出现最佳耗能机构,提高R.C.剪力墙的抗震能力,并使内力、位移及延性分析简化。     

Rheological characterization of yellow grease and poultry fat

The rheological properties of yellow grease and poultry fat and their liquid density at 25.0°C were experimentally determined. Dynamic viscosities of these industrial recycled fat products were measured for shear rates of 0.65 to 32.34 s⁻¹ at temperatures of 15.6 to 71.1°C. The resulting measurements were fitted to a power law model to obtain values for the consistency coefficient and the flow behavior index. The data was also fit to Andrade's equation to relate viscosity to temperature. These results indicated pseudoplastic flow behavior for both products, with increasing non-Newtonian behavior at higher temperatures and shear rates.     

Plastic deformation kinetics of electrodeposited Cu foil at low and intermediate homologous temperatures

The plastic deformation kinetics of electrodeposited (EP) Cu foil (grain size d=0.6 μm) were determined at 296–448 K and compared with those for vapor-deposited (VP) foil (d=0.5 μm) tested at 77–473 K. The apparent activation volume v=kT ∂ ln for both materials exhibited a minimum at ∼350 K, and at this temperature, there occurred a marked increase in the temperature dependence of the flow stress σ. The rate-controlling mechanism in both materials at T<373 K appears to be grain boundary shear induced by dislocation pileups at the grain boundaries. The results at T=373–473 K suggest that the dislocation pileups are relieved or prevented and that either cross slip or intersection of dislocations is rate controlling with stronger support for the latter. The determination of the rate-controlling mechanism at the higher temperatures is complicated by possible changes in defect structure due to thermal annealing, and therefore, the operative mechanism corresponds to a structure that may differ from the initial, as-deposited condition.     

Scale-up and endpoint issues of pharmaceutical wet granulation in a V-type low shear granulator

A 3² factorial experiment is conducted in a 57 liter low shear granulator to evaluate the influence of changes in binder strength and agitator speed on the response variables of granule size, granule morphology, granule density and torque input. Results are compared to previous work in a 2 liter granulator and scale-up issues between the two granulators are addressed.     

用VSP数据中下行P-SV转换横波求取横波速度

探讨了用零偏移距三分量VSP数据中的下行P－SV转换横波,求取厚度相当于VSP采集点距的地层横波速度。从井下检波器方位校正得到横向垂直分量,对其二维谱中各类波的能量和特点进行分析,通过二维滤波得到信噪比较高的下行转换横波,选取振幅较强的同相轴提取波至时间,获取了横波速率及泊松比。结果表明,即使是零偏移距VSP数据,只要其上有明显可见的转换横波,也能以采集点距的量级计算横波层速度。     

水平管内气-液两相泡状流壁面切应力预测模型

水平管泡状流时气泡主要集中在管道的上部,在管下部只有少量的气泡.由于气泡的非均匀分布,壁面切应力沿周向变化.本文以水平管内气-液两相泡状流壁面切应力均相预测模型为基函数,在实验测量结果的基础上,建立了考虑气泡非均匀分布的水平管内气-液两相泡状流壁面切应力预测模型,预测模型能够反映不同工况下的壁面切应力沿周向的变化趋势,与实验测量结果比较,误差范围小于10%.