辽宁省2002年水情趋势预测

针对辽宁省旱涝发生的基本规律,系统介绍多年来开展水文中长期预报所应用的理论和方法,总结水情趋势预测工作的经验,对2002年水情趋势进行分析预测。     

倾斜水塔的爆破拆除

针对某部倾斜水塔的定向爆破拆除,从防止水塔倾倒偏移和筒体触地冲击地面对周围环境造成影响等不利情况,确定爆破方案和采取相应的防护措施.     

Change in Availability of Mineral and Raw Material Resources as a Result of Scientific and Technical Progress

The tendencies characterizing worsening of natural, mining and technical, as well as mining and geological conditions of deposit mining are analyzed for the last 100 years. The change in prices for mineral raw material is shown, and the influence exerted by scientific and technical progress in the sphere of mining and processing of copper-containing ores is established. An approach to the estimate of available mineral reserves and possibility of their involvement in mining is stated.     

南阳凹陷北部斜坡带有利勘探目标分析

南阳凹陷是30多年的老探区,对油气的成藏条件、分布规律都有较深的认识。南阳凹陷北部斜坡带是油气大规模运移的指向地区。该区三角洲砂体发育,存在三个鼻状构造隆起,并发育北西、北东向两组断裂,成藏条件有利。分析认为该区带下一步有三个勘探目标:官庄-魏岗、白秋-张店和东赵庄地区,有望找到1000×104t储量。     

国际水资源保护和管理的最近动态——水与可持续发展

阐述了可持续发展及其要求 ,水在可持续发展中的作用 ,国际关于水资源保护和管理的最近动态。最后提出 ,可持续发展是经济社会以及人口、资源和环境的协调统一 ,应从根本上将“先污染后治理”及“防治污染”改为“避免污染”的战略 ;从传统的整体规划向机能整体性规划发展 ;保护和建立河流系统环境 ;着手研究和解决全球环境问题。     

Stability of Standard Electrolytic Conductivity Solutions in Glass Containers

The stability of solutions having an electrolytic conductivity, κ, of 5 μS/cm to 100 000 μS/cm packaged in glass screw-cap bottles, glass serum bottles, and glass ampoules was monitored for 1 year to 2 years. The conductivity was determined by measuring the ac resistance of the solution. Mass loss was also monitored for solutions packaged in bottles. The solutions were prepared using KCl in water (κ ≥100 μS/cm) or KCl in 30 % (by mass) n-propanol 70 % (by mass) water (κ ≤ 15 μS/cm). The conductivity changes were compared by packaging type and by nominal κ. The main causes of the κ changes are evaporation (screw-cap bottles) and leaching (screw-cap bottles, serum bottles, and ampoules). Evaporation is determined from mass loss data; leaching occurs from the glass container with no change in mass. The choice of optimal packaging, which depends on the conductivity level, is the packaging in which κ changes the least with time. Ampoules are the most suitable packaging for standards having nominal κ values of 500 μS/cm to 100 000 μS/cm. Screw-cap bottles are most suitable for standards having a nominal κ of 5 μS/cm to 100 μS/cm.     

正确把握电信发展规律

二十世纪末，全球网络经济过热和电信业陷入之际，正是中国电信业深化体制改革、破除垄断、全面引入竞争之时。面对复杂的国际国内形势，中国电信业在一系列关系发展全局的重大问题上，坚持理性与务实，保持了行业积极稳健的发展。我国电信业目前正处于新的发展时期，面对新的机遇和挑战，在总结国内外实践的基础上，要进一步加深对电信发展基本问题的认识，要正确处理好一系列带有全球性、战略性、方向性的重大关系问题。     

GAO Feng~1,LI Wei~2,TANG Zon

tific Experiment Center of Guangxi Medical University,Nanning 530021,China)Objective:To investigate the mutation pattern of adenomatous polyposis coli(APC),Kirsten-ras(K-ras) and p53 genes in sporadic colorectal cancer tissues.Meth     

KTX—1型矿井提升机信号与通讯装置

根据矿山的实际情况,研制开发了矿井提升机信号与通讯装置,介绍了其系统的构成工作原理以及应用效果。