压浆混凝土钻孔灌注桩竖向承载力试验研究

本文通过在粗砂层中采用压浆混凝土钻孔灌注桩的静载荷试验 ,并与普通钻孔灌注桩进行分析比较 ,表明压浆混凝土钻孔灌注桩技术能显著提高基桩的承载力 ,减少沉降量 ,分析结果可供类似工程参考。     

一个房子、一场戏 沈阳师范大学戏剧艺术学院

文章从戏剧经验开始，结合对沈阳师范大学戏剧艺术学院的设计分析，解读了房子和戏剧的具体关系，并探索了空间元素直接呈现的可能性。     

粗骨料对高性能混凝土抗压强度的影响

抗压强度为３０ＭＰａ的砼中，砼受压破坏时粗骨料是完整的没受到破坏。而高性能砼则由于砼强度比较高，砼破坏时粗骨料几乎完全断裂破坏。本文对不同品种的粗骨料在砼中的体积含量、最大粒径对砼强度的影响进行了试验，并根据试验结果得到了数学模型，用以评价不同品种粗骨料的性能     

骨料对140MPa强度等级混凝土性能的影响研究

骨料种类、级配、最大粒径、粒形及砂率均能影响超高强混凝土的工作性能和抗压强度。试验结果表明,选用最大粒径为16mm且10~16mm碎石占70%的卵碎石为骨料,采取40%的砂率配制的自密实混凝土标准试块90d抗压强度能达到145.8MPa。     

35CrMo钢组织遗传消除工艺研究

通过对船用长轴类大锻件的热处理工艺研究得知,采用临界区高温侧正火热处理工艺可以有效消除35CrMo钢组织遗传现象,细化晶粒。     

基于C-RAN组网方式的5G传输承载方案研究和实践

为降低运营成本，移动公司计划将基站C-RAN集中化组网建设，对传输承载网提出很大挑战，结合移动城域传输网现状，分析前传和回传承载方案，提出可能的传输组网方案，其中C-RAN集中化将消耗较多光纤资源，为降低C-RAN传输接入建设的光纤消耗量，拟采用粗波分复用技术、彩光技术等方案进行研究、实践。     

The effect of random grain distributions on fatigue crack initiation in a notched coarse grained superalloy specimen

Coarse grained superalloys are of large interest in high temperature applications, and can be found in e.g. gas turbine components, where great care must be given with respect to high temperature fatigue. Due to the large grain size, the material behaviour at e.g. sharp notches cannot be considered homogeneous. As a consequence, the fatigue behaviour is likely to expose a large variation. In order to numerically investigate this variation, a Monte Carlo analysis has been carried out by 100 FE-simulations of notched specimens, where placements and orientations of the grains were randomised. Furthermore, each grain was modelled as a unique single-crystal, displaying both anisotropic elastic and plastic behaviour and tension/compression asymmetry. The effect of randomness was investigated by the obtained dispersion in fatigue crack initiation life. It was concluded that the fatigue life behaviour of coarse grained nickel-base superalloys may show a considerable variation, which cannot be captured by one single deterministic analysis based on data for a homogenised material. Furthermore, the dispersion is of such a magnitude that it needs to be taken into account in industrial applications where highly stressed coarse grained materials are used.     

大豆粗脂肪酸值检测方法的改进

以大豆粗脂肪酸值检测方法为研究对象,对GB/T 14488.1-2008《植物油料含油量测定》与GB/T 5530-2005的标准测定方法进行改进,减少称量步骤、缩短抽提时间,以提高检测效率。试验结果表明:改进后的大豆粗脂肪酸值检测方法在保证检测结果准确性的前提下,可大幅缩短检测时间,提升检测效率。     

Geopolymers based on a coarse low-purity kaolin mineral: Mechanical strength as a function of the chemical composition and temperature

A coarse mineral with 70% kaolinite and 30% quartz was calcined and chemically activated by alkaline solutions of Na₂SiO₃ and NaOH. The compressive strength evolution was investigated as a function of the curing temperature at 20 and 80 °C, and the molar ratios of SiO₂/Al₂O₃ (2.64-4.04) and Na₂O/Al₂O₃ (0.62-1.54). For curing at 20 °C, the best composition was SiO₂/Al₂O₃ = 2.96 and NaO/Al₂O₃ = 0.62, reaching 85 MPa at 28 days. Curing at 80 °C had a positive effect on the strength development only in the first 3 days. X-ray diffraction of the geopolymeric formulations showed the formation of amorphous silicoaluminates of similar nature. The microstructure consisted of unreacted quartz and metakaolinite particles in a matrix of silicoaluminate polymer and condensed silica gel from the unreacted sodium silicate.     

Effect of saline water on the flotation of fine and coarse coal particles in the presence of clay minerals

This research addresses two important issues confronting coal flotation plants in Australia, the use of saline water and the processing of clayey coal. Two coal samples obtained from BHP Billiton Mitsubishi Alliance (BMA) and Xstrata were tested to represent coarse coal flotation and fine coal flotation, respectively. Saline water with low, medium and high ionic strengths and individual electrolytes encountered in the flotation plants were used. It was found that saline water had a more pronounced effect on fine coal flotation than coarse coal flotation despite similar mineral compositions and clay mineral types present. Although saline water increased froth stability in both fine and coarse coal flotation, coal particle aggregation only occurred between fine coal particles resulting in an increased recovery of coal particles as well as the entrapment of fine gangue minerals.