夏玉米田蒸发蒸腾量与棵间蒸发的试验研究

本文利用2年的大型称重式蒸渗仪和小型棵间蒸发器的测定资料，研究了不同灌水(2001年灌140mm、2002年灌65mm)条件下夏玉米生长期间的逐日蒸发蒸腾和棵间蒸发过程。结果表明，2年夏玉米生长期间棵间蒸发占总蒸发蒸腾量的比例分别为43.69%和48.12%。分析得出夏玉米出苗前利用小型棵间蒸发器实测蒸发的修正系数为0.96。同时，分析了棵间蒸发占蒸发蒸腾的比例随叶面积指数(LAI)和表层土壤含水量的变化关系。     

新型随钻堵漏钻井液体系的研制

针对平方王油田钻井过程中钻井液漏失的难题,研制了一种新型多功能随钻堵漏钻井液体系。介绍了新型随钻堵漏钻井液体系的配方优选,探讨了该体系的最佳流变性能、防塌抑制性和悬浮稳定性,研究了该体系的承压能力和封堵能力。实验结果表明,该体系具有较强的抗温抗污染能力,悬浮稳定性好,密度调节范围广,封堵填充加固能力强,具有常规钻井液及随钻堵漏钻井液的性能特点,易操作、可调整。     

南京城市用地抗震适宜性评价的影响因素分析

文章通过对各种规范的分析,并综合考虑了南京的地质条件,得出了南京城市用地抗震适宜性评价的影响因素,并给出了影响因素的计算方法。     

聚类分析法在土层划分中的应用

聚类分析是运用数学的方法来研究类的划分以及各类之间的亲疏关系,它对于一切涉及到分类的学科都是适用的。首先简要介绍了聚类分析确定土层的步骤,它主要包括指标的选择,数据的标准化,相似(距离)矩阵,聚类方法的选择,聚类数目的确定和聚类结果的解析;然后以苏州南通(苏通)大桥进行的现场扁铲侧胀试验结果为例进行聚类分析;最后得出结论,此方法在分析土层组成上是可行的。     

The effect of alumina content on fracture property of all-ceramics zirconia

The purpose of the present study was to evaluate the effect of Al2O3 content on the fracture property of all-ceramics ZrO2. To improve the all-ceramics ZrO2 restoration mechanics properity ,96 samples containing 0,5,10 and 15 wt% of Al2O3 particles were prepared by cold isostatic pressing (200 MPa) and 1 550 ℃ sintered .The phase was analyzed by X-ray diffraction analysis and the bulk densities of the samples were made using Archimedes principle. Samples were randomly divided into four groups. In each group, 24 specimens were prepared so that the angle between notch and specimen’s long axis is 90o and 60o. Notch depths were 1 mm for all samples. Samples were loaded with three-point bending method. 90° cut samples were used to measure fracture toughness while 60°cut samples were used to observe fracture curve by taking points on the fracture extension path under microscope, plotting points on coordinates, generating fitting curve by software "Origin", and analyzing the microstructure of the specimen fracture surfaces by scanning electron microscopy (SEM).The results show that the increment of Al2O3 has insignificant effect on the densification of all-ceramic ZrO2.XRD analysis shows that the specimen is comprised of t-ZrO2 and α- Al2O3 before fracture while fracture surface is m-ZrO2, t-ZrO2 and a-Al2O3. ZrO2 containing 10% Al2O3 has the optimum mechanical properties and unconspicuous crack propagation and distribution. The observations may provide a reference for the materials selection, shape design , and production process of all-ceramic crown and bridge.     

一种新的钼氧化物相SCIEI

本文报道一种新发现的钼氧化物相并讨论了早期钼氧化物量热工作对燃烧产物鉴定中可能存在的疏漏。     

EFFECT OF OXYGEN CONTENTS ON OXYGEN POTENTIALS OF H_2O-H_2 AND H_2O-H_2-INERTS GAS MIXTURES

考虑到氧的影响,本文导出一组H_2O-H_2及H_2O-H_2-惰气混合气体氧位新的表征式。经典表征式是该公式的特例。本文讨论了微量氧存在时对平衡气氛影响的各种因素以及减小误差的最佳配气条件,同时评价了某些用H_2O-H_2(或H_2O-H_2-惰气)混合气体控制氧位的平衡实验的可靠程度。     

液—液界面上鼓入气泡时的传质

采用酸性溶液-锌汞齐体系,模拟高温冶金中的熔渣-金属(熔锍)体系,实验测得了外界向界面上鼓人惰性气泡时指示离子的传质系数及其与各气泡特征参数的关系,实验结果与已导出的传质理论模型吻合良好,进一步验证了关于相界面上惰性气泡促进的相间传质模型.     

离心式水泵的节能技术

离心式水泵是一种通用机械，在油田的油气处理装置中被广泛应用，如果能合理降低水泵的能耗，提高泵的效率，意义甚大。现文从目前油田使用角度出发来讨论了水泵的节能技术。     

1∶1价电解质溶液的Pitzer参数与离子半径

根据 Pitzer 的统计力学公式,导出了单一电解质溶液的渗透系数和活度系数方程;获得了 Pitz-er 方程中第二维里系数β_(MX)~(0)、β_(MX)~(1)与离子“硬球”半径之和的关系式。提出了“离子重叠”模型及相应的关系式,揭示了电解质溶液的热力学性质与离子半径以及溶剂化作用之间的关系。