托板控制下开采沉陷的阶段性和板裂性

本文以四川杉木树矿山区开采为例，介绍了采场上方厚硬岩层对开采沉陷的托板式控制作用，分析了一级、二级托板控制作用下开采沉陷所呈现的阶段性特征及地表裸露基岩的板裂性特征。     

RADIOACTIVE OR NATURAL TRACER。TECHNIQUES FOR LEAK DETERMINING OF DAM ABUTMENT

Infiltration and localization of preferential infiltration zones at the dam abutment are measured using radioactive tracer tests of flow in boreholes,meanwhile interconnection between boreholes and the energing water points is analysed.The theory and practice of radioactive tracer synthetic detective method are described to give methods and calculation formulae used under the condition of stable flow in single well to measure permeability coefficient and hydrostatic heads.Major single hole techniques including measurement for seepage line,velocity,rate of seepage flow and relationship of recharge of groundwater in aquifers are introduced briefly.The possibilities offered by natureal tracers are analysed,uincluding electric-conduct,pH-value and temperature of water as well as stable isotopes(D,^18O) and tritium.Furthermore,the sensibilities of this theory and methods were confirmed by detecting seepage flow field of Xinanjiang Dam.     

冰淇淋风味、营养和保健添加物探讨

冰淇淋风味、营养和保健添加物探讨杨湘庆，沈悦玉，宋春发（天津商学院，３０００００，天津）（天津裕元饮料食品厂，３００１２２，天津）冰淇淋的发展历史，虽然各家说法不一，但基本一致的观点如下：１）我国唐代已有类似冰棍的“御冰”，６２７～６４９年间，唐皇李...     

模具及模具材料激光相变硬化的初步探索与实验

简要介绍了激光强化的基础知识，分析了激光固态相变硬化机理，设计并进行了模具及模具材料表面的激光强化实验。将使用计算机模拟得到的指导性参数与使用经验参数获得的强化效果对比，为修正计算机模拟的误差，从而获得激光表面非熔凝淬火的最佳加工参数提供了一个可靠的途径。     

拱型屋面弯曲回弹变形、强度和稳定性的研究

计算了拱型屋面弯曲回弹变形；分析了在对称和非对称载荷作用下拱型层面弯曲应力；计算了在对称载荷作用下拱型面临界载荷，计算结果表明：拱型屋面的破坏不是强度不足，而是失稳所致。     

文南油田文33断块沙河街组下二段剩余油分布

油田为多油层非均质油气藏 ,显已进入高含水开发阶段 ,剩余油主要分布于井点损失带、构造高部位、构造边部、断层边缘。在沉积相图上表现为水下分流河道间湾、侧翼或决口扇地区 ,纵向上以 S2下 4 - 5、S2下7- 8砂组为主     

低锌凝固浴纺丝试验

凝固浴采用低锌，并适当降低硫酸浓度进行人造丝生产是可行的。粘胶中加尿素，显示其在低锌纺线工艺的一定贡献，尿素对粘胶质量未产生不良影响。成品丝物理指标完全达到FJ217-78部颁标准，与常规凝固浴纺丝产品物理指标水平基本相同。     

Influence of Various Zirconia Additives on High Temperature Properties of Magnesia Spinel Brick

Magnesia spinel refractory is a promising material because of its good properties at high temperature,good exfoliation-and coorosion-resistances,Three kinds of additives containing ZrO2 were added o magnesia spinel refacto-ries to get better exfoliation resistance,corrosion resistance and adhensiveness,Three kinds of ZrO2-containing additives added to optimize the properties of the material are particularly discussed in this paper.