低松弛预应力钢绞线松弛试验数据线性回归模型

用数理统计方法建立了低松弛钢绞线松弛试验数据的线性回归模型，用于推算１０００ｈ松弛值。根据计算结果．能够分析和判定试样是否满足规范要求，并能对松弛试验的有效性和回归结果可靠性进行评价。     

对修改的翁旋回预测公式的求解方法

对修改的翁旋回预测公式Q_t=A Bt~ne~(-t)中的n值等进行了调整,去掉了其为整数的限制,使Q_t对已知数的拟合更好.本文除应用误差平方和为最小的条件以外,还应用了最大拟合误差为最小的条件来确定上述公式中的参数.应用本文方法讨论了油田年产量的预测.     

长江重要堤防隐蔽工程护岸工程运行状况和效果分析

长江重要堤防隐蔽工程护岸工程完成长度455km，经过几年运行，发生水毁的部分很少。在分析局部水毁情况及原因基础上，对护岸工程效果进行了分析评价。     

Application of Improved Grey Prediction Model to Petroleum Cost Forecasting

1. Introduction The grey theory, developed originally by Deng (1987), is a multidisciplinary and generic theory that deals with systems that lack adequate information and/or have only poor information. The fields covered by the grey theory include systems analysis, data processing, modeling, prediction, decision making and control. The grey theory mainly conducts systems analysis with poor, inadequate or uncertain messages. Grey forecasting models have been extensively used in many applicatio…     

汽—液—液三相与汽—液两相塔板效率比较

本文通过小型精馏塔及600×150 mm~2矩形模拟塔的实验,对比研究了气(汽)-液两相和气(汽)-液-液三相的塔板效率。并就物系性质(表面张力梯度、液体粘度或分散粘度),两液相体积比,气速及操作工况对传质的影响进行了研究。提出三相传质和两相传质差异的主要因素,得出估算三相精馏塔板效率的关联式。     

灰色正交多项式模型在水文预报中的应用

文章通过对灰色正交多项式模型的建模、应用实例及模型精度分析,表明该模型用于处理短系列资料较为实用。     

Intracellular ice formation: cryomicroscopical observation and calorimetric measurement

The formation of ice crystals within biological cells is generally deleterious and results in a severe loss of cellular viability and function. With the aim of circumventing this lethal event, the mechanisms of nucleation and their dependence on governing parameters such as temperature, cooling rate and solute and/or additive concentration, and the correlation with the osmotically induced water transport across the cell membrane were investigated. Quantitative low-temperature light microscopy was used for this purpose as it offers the major advantage of studying the dynamics of the involved processes. To substantiate further the visual observations of the morphological changes associated with intracellular ice formation, supplementary studies by differential scanning calorimetry (DSC) were performed under comparable conditions to measure the quantity of water actually transformed into the crystalline state due to the evolution of latent heat. Human lymphocytes were used as a biological model cell. In particular it could be shown that the twitching type of intracellular ice formation which is evident but difficult to observe under the cryomicroscope can be attributed to a liquid-solid phase change within the cells as determined by DSC. Good agreement was obtained between the results measured by both techniques with respect to the following dependencies of governing parameters: the fraction of cells exhibiting intracellular ice determined as a function of the cooling rate shows a sharp demarcation zone with an increase from 0 to 100% at about the same threshold cooling rate. On the other hand, the temperatures at which intracellular ice forms were found to be only weakly dependent on the cooling rate. With respect to the effect of cryo-additive concentration at a fixed value of the cooling rate, the crystallization temperatures were seen to decrease with concentration. The DSC results may hence be regarded as a validation of the microscopic observations.     

月径流序列的季节性ARIMA模型

基于月径流序列是一类周期性的非平稳时间序列的特点,本文建立了季节性ARIMA 模型.文中编制了电算程序,并应用于水库的月径流预报,获得了满意的结果.     

四川碳酸盐岩气层钻井完井损害的矿场检测及酸化效果评价

本文采用不稳定试井方法,对川东中石炭统为主的裂缝-孔隙型气藏及川中雷一～1(T_2r_1～1)孔隙型气藏钻井、完井损害的矿场检测作了定量评价,预测了解除气层损害后的天然生产能力。在对酸化效果评价的基础上,提出了今后酸化工艺类型及规模的建议。     

我国第一条破冰型三用工作船的监造管理

上海中华造船厂为中国海洋石油渤海公司建造的两条破冰型三用工作船分别于1993年1月和6月签字交船,渤海石油公司破冰船项目组为期两年的监造工作已全面结束。本文概述了该船的技术设计审查和施工设计审查,以及建造过程中的进度、资金和质量控制具体作法,希望对今后类似的船舶设计与建造有一定的参考价值。