分光光度法测定污水中微量丁基黄原酸盐

介绍了用四氯化碳在pH5.5的缓冲介质中萃取黄原酸铜,然后在有机相中加入铜试剂乙醇溶液,在普通分光光度计上测定污水中微量黄药的方法。对萃取的pH、温度、时间、干扰离子等因素进行了试验,并用正交优选法找到了合适的络合掩蔽剂配方,能较有效地排除污水中大部分阳离子的干扰。方法简便,灵敏度高,摩尔吸光系数8.4×10~4,适宜于在有黄药污染的厂矿企业推广。方法的变异系数为1.4—12.5％,标准加料回收率在98—104％之间。     

静电势能模型对类水滑石结构与性能的理论研究

采用晶体学理论建立类水滑石静电势能模型,对由20层且每层2107个阴离子组成的镁铝类水滑石超分子体系中层间阴离子所受的静电势能进行理论计算．研究结果表明,调变层板金属离子摩尔比影响层板电荷密度与层间阴离子间距,计算得到的阴离子静电势能值与其热稳定性相一致:插层阴离子的电荷与尺寸不同直接影响阴离子的势能大小．     

利用蜂鸣片受迫振动测液体黏度

用信号发生器驱动蜂鸣片在真空泵油中产生受迫振动,通过测量液体中振动物体的谐振频率求得液体阻尼系数,进而确定了液体黏度.     

Ionizing Dose Effect of Thermal Oxides Implanted with Si^＋ Ions

Total ionizing dose effects of Si^＋ ion implanted thermal oxides are studied by 10keV x-ray irradiation. Photoluminescence （PL） method is engaged to investigate nanostructures of samples. Ar^＋ implanted samples are also studied by the same way to provide a comparison. The results show that Si^＋ implantation following with high temperature annealing can significantly reduce the radiation induced flatband shift, which is caused by net posi- tive charge accumulation in oxides. This reduction is attributed to the formation of Si nanoscale structures. Ar^＋ implantation is also found to reduce the radiation induced flatband shift, while it is different that the reduction with Si^＋ implantation shows little dependence on implant dose of Ar^＋ ions. This is explained by possible increase of recombination centres.     

Mg(IO_3)_2-LiIO_3-HIO_3赝三元系的相关系

一、引 言 碘酸盐晶体由于存在着未成键的电子对,通常不具有对称中心,因而在电光和非线性光学效应方面具有广泛应用的可能性.同时,大部分碘酸盐晶体的空间堆积系数较低,约为50%左右,这就为离子在晶体中运动提供了可能性.所以,碘酸盐晶体作为快离子电导材料也是十分值得探讨的.     

Directional growth of Al-Mg2Si eutectic alloy in the SZ2 unmanned spaceship

This paper reports the investigation results on directional growth of Al-Mg2Si eutectic alloy in the SZ2 unmanned spaceship. The analysis shows that microgravity has influence on the directional growth of Al-Mg2Si eutectic alloy. The eutectic colony in space-grown sample is larger than that in ground-grown sample, and the directional effect is not so good as that of terrestrial sample. But there is no obvious difference in the lamellar thickness between these samples, and lamellar interspacing in space sample is smaller than that grown on the ground. A simple discussion is done on the gravity effect on the directional growth of Al-Mg2Si eutectic alloy.     

话音控制计算机

一、引 言 用话音直接控制机器(计算机)从而实现真正的人与机器对话,这是人们早就想实现的.我们平常说的某种计算机语言(例如BASIC语言),是人机对话式语言,那是通过键盘、打印机进行文字对话,用户要敲键符,将信息告诉计算机,不是话音对话.用话音控制而不是键控制计算机的好处是显而易见的.人们将可以用话音方便地直接控制计算机,通过计算机再去控制其它机器工作,从而实现更高程度的自动化.这在机器操作员忙碌时尤感需要.例如,显微镜的用户可以不停止观察而用话音不断地将观察结果报给计算机. 语音识别的原理可以从语言识别要解决的三个主…     

Natural Frequency for Rectangular Orthotropic Corrugated-Core Sandwich Plates with All Edges Simply-Supported

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静电势能模型对类水滑石结构与性能的理论研究

The electrostatic potential energy model of hydrotalcites was based on the theory of crystallography. The anionic potential energy of MgAl-hydrotalcites, with 20 layers and 2107 anions per layer, was calculated, and the anionic stability of the hydrotalcites was investigated. The charge density of the layer and the distance between the adjacent anions varied with the molar ratio of Al3+/(Mg2+ +Al3+). Anionic potential energy depended on the charge and size of the anions. Calculation results remained consistent with thermal stability and the ion exchange ability reported. This model is able to predict anionic stability of the hydrotalcites.