引水式水电站压力引水隧洞最优洞径的探讨

长压力发电引水隧洞的洞径既影响工程的造价。又影响电站的长期运行效益。本文系统分析了涉及隧洞洞径设计的各种复杂因素,建立了优化数学模型,并编制了计算机程序,以某工程为例进行分析,得到满意的结果。本文的研究填补了目前水工建筑物优化设计研究在这方面的不足。     

倾斜型纤维模块对耐火衬里性能的影响

蒸汽过热炉耐火衬里操作时普遍存在缺陷,分析了缺陷产生的原因,并采用倾斜型纤维模块对耐火衬里的整体结构进行了改进设计．通过对传热模型的数值计算,证明此改进设计可行,改进后的结构能够提高过热炉的热效率．     

Corrosion control in underground concrete structures using double waterproofing shield system (DWS)

High level of structural and waterproofing stability leads to long-term service life in underground infrastructures. Interaction between aggressive groundwater with tunnel causes corrosion and damage in concrete structure due to steel reinforcement corrosion and concrete cracks. This study introduces a double waterproofing shield system (DWS) as an innovative solution to waterproofing and structural failures in underground concrete structures. In this method, ordinary shotcrete mixture replaces by an organic polymer concrete (OPC) to construct a water-resistant temporary support right after each partial excavation. Two groups of specimens including reference concrete and OPC specimens were provided and tested in accordance with ASTM C 642. Waterproofing parameters including porosity, pore volume, permeability and hydraulic conductivity have been determined. Results show a remarkable reduction in mentioned parameters for OPC compared with ordinary concrete. Improvement in waterproofing performance of temporary support corresponds to a healthy final lining and increase in service life of the structure.     

厚表土层中竖井沥青夹层复合井壁的试验研究

以相似理论为基础，用模拟试验研究了有沥青夹层的复合井壁，得到了沥青夹层的适宜厚度，传递竖直附加力的规律和数值；同时研究了外层井壁的可压缩层材料，获得可压缩层材料与传递到内层井壁的竖直附加力的关系。     

地震动力作用下纤维混凝土隧道衬砌的试验研究

通过与普通混凝土衬砌结构的对比,研究了纤维混凝土衬砌结构在地震动力作用下的反应和破坏形态.基于相似理论,采用5 m×5 m三向地震模拟振动台进行模型试验,通过输入不同大小的地震波,研究纤维混凝土衬砌在地震动力作用下的破坏特征,并探讨破坏机理.试验结果表明:素混凝土衬砌抗拉强度低、脆性大,裂缝基本呈直线型,断口干净整齐,裂缝挤压处有明显掉块痕迹;纤维混凝土具有限制裂缝发展和结构变形的能力;在地震动力作用下,纤维通过黏结应力能够使混凝土吸收更多能量,降低幅值,反应滞后,减轻了地震力对结构的破坏;纤维混凝土衬砌裂缝多呈锯齿形,挤压松散的小碎块通过纤维黏结在裂缝口.     

Key Technologies for Energy Efficient Al(OH)_3 Dilute Phase Fluidized Bed Roasting Furnaces

Research on new types of castables, pre-cast assembly parts and thermal insulation materials with good resistance to wear, thermal shock and erosion, and low thermal conductivity, was done to solve problems of high system energy consumption, cracking and spalling of partial lining and mismatch of furnace top material and hanging material and so on, caused by unreasonable design of China's Al(OH)3 dilute phase fluidized bed roasting furnace lining. Several difficult problems such as the matching of different materials, preservation of expansion joints among different zones and reasonable mechanical distribution of lining were solved. "Integrated furnace" concept was established including refractories R D, lining structure design, construction optimization, furnace warming technology, initial operation and lining maintenance technology. The key technologies of high-efficiency and energy-saving for furnaces were developed. These achievements have been applied to China's Al(OH)3 dilute phase fluidized bed roasting furnaces to reduce energy consumption by 1 000 MJ per ton alumina, enhance the capacity and reduce the exhaust gas emission.     

MDC-29型电解槽钢衬玻璃钢槽盖的制作

从材料的选择、衬贴工艺、质量检查、防腐性能等方面详细介绍了用197#树脂制作MDC-29型电解槽钢衬玻璃钢槽盖的过程.其完全能够代替MDC-29型电解槽全玻璃钢槽盖.     

中间包永久衬浇注料的损毁原因及其改进

通过对中间包永久衬现用浇注料各项性能指标的测定和分析,找出了其损毁的主要原因,提出了延长浇注料寿命的措施。改进料初步取得了良好的使用效果。     

层次分析法及其在耐火材料中的应用

介绍了层次分析法（ＡＨＰ）的基本概念及ＡＨＰ模型的求解,同时以评价尖晶石质防堵内衬的综合性能为例,讨论了层次分析法在耐火材料中的应用。     

Structural properties of nanocomposites based on resole-type phenol-formaldehyde oligomers and detonation nanodiamonds

Using the methods of infrared spectroscopy (IRS) and X-ray photoelectron spectroscopy (XPS), it was shown that short-term high-energy machining of detonation nanodiamonds (DND) leads to structural changes in the crystal structure and functional composition of the surface layer on particles. The possibility of spontaneous formation for stable colloidal systems with a narrow size distribution of mechanically activated DND in phenol-formaldehyde oligomers (PFO) was established. By molecular spectroscopy it was revealed that π → π* interactions of the aromatic rings of PFO are caused by orientational phenomena as a result of hydrogen bonds between an activated DND surface and functional groups of PFO. The effect of DND concentration on the curing reaction parameters ofpsgr the phenol-formaldehyde oligomer was determined by differential scanning calorimetry (DSC). The concentration effect of mechanically activated nanodiamonds on the physical and mechanical characteristics of a composite material based on phenol-formaldehyde binder and polyamide paper (Nomex) was studied. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48582.