1-吡啶-3-[4-(苯基偶氮)苯基]-三氮烯与汞的显色反应及其应用

在Triton X-100存在下的pH 10的Na2B4O7-NaOH缓冲介质中,研究了1-吡淀-3-[4-(苯基偶氮)苯基]-三氮烯(PYPAPT)与汞离子(Hg2 )的显色反应,建立了微量汞的测定方法。Hg2 与PYPAPT形成1∶2的红色络合物,络合物最大吸收波长位于518 nm,表观摩尔吸光系数为1.42×105L.mol-1.cm-1,Hg2 质量浓度在0~0.64 mg/L范围内符合比尔定律。方法用于铅锌矿样中微量汞的测定,RSD小于2.6%,测定结果与AAS法相符。     

SHS结合热压制备TiC-Al2O3/Fe-Al复合材料

以天然钛铁矿、铝粉和石墨为主要原料,采用自蔓延高温合成技术、铝热还原法并结合热压烧结技术,制备出TiC—Al2O3／Fe—Al复合材料．研究表明：预热时间少于120s时,预热时间越长,反应燃烧波速度越大,当预热时间继续增大,对反应燃烧波速度的影响不再显著;加入添加剂Y2O3为0．2％时,金属相较均匀地弥散分布在陶瓷颗粒周围．晶粒尺寸约为2～3μm,复合材料的相对密度达到94％,抗弯强度和硬度分别为599．29MPa、83．7HRA．     

Probe into Key Techniques of Regional-Oriented 3D GIS On the key techniques of 3D GIS used for regional Geological Information System

Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are the most difficult problems for constructing the system. Based on the current 3D GIS technique, some basic problems in establishing the system are discussed in this paper, including 3D spatial data model, 3D geological modeling, and visualization of 3D geological data. A kind of 3D vector data model based on boundary representation for geological object and its topology was developed in order to model and visualize complex geological structures. In addition, some key techniques are pointed out for further study.     

Effects of La(NO_3)_3 Treatment on Photocattalytic Activity of TiO_2 Films Prepared by Micro-Arc Oxidation

Effects of La(NO_3)_3 Treatment on Photocattalytic Activity of TiO_2 Films Prepared by Micro-Arc Oxidation     

基于3S共享平台下的城市防灾规划模型

城市防灾工程规划在现代城市规划过程中是一个极为重要的方面,通过对城市防灾各个影响因素的分析,结合目前我国基于3S技术的数字城市开发平台的发展现状及特点,针对如何在防灾规划中合理利用3S共享技术平台这一高科技手段,提出了一个初步的城市防灾预测模型.     

Improved estimation of defocus blur and spatial shifts in spatial domain: a homotopy-based approach

This paper presents a homotopy-based algorithm for the recovery of depth cues in the spatial domain. The algorithm specifically deals with defocus blur and spatial shifts, that is 2D motion, stereo disparities and/or zooming disparities. These cues are estimated from two images of the same scene acquired by a camera evolving in time and/or space. We show that they can be simultaneously computed by resolving a system of equations using a homotopy method. The proposed algorithm is tested using synthetic and real images. The results confirm that the use of a homotopy method leads to a dense and accurate estimation of depth cues. This approach has been integrated into an application for relief estimation from remotely sensed images.     

非正弦不对称三相三线电路负载侧相电压的定义与测量

对非正弦不对称三相三线电路，如何恰当地定义负载侧的相电压并能方便地测量一直未有明确的统一认识。本文从研究三相三线电路中相电压与线电压的关系着手，根据外部等效的思想。来定义三相三线电路负载侧的相电压。按此定义的相电压恒满足ｕ，＋“ｂ＋“ｃ＝０，并可方便地通过三相电压互感器或直接依据负载侧的线电压来唯一确定负载侧的相电压。     

新试剂2-(2''''-苯并噻唑偶氮)-1,8-二羟基-3,6-萘二磺酸与钛(Ⅳ)和 CTMAB 形成三元络合物显色反应的研究

在阳离子表面活性剂ＣＴＭＡＢ存在下，２－（２′－苯并噻唑偶氮）－１，８－二羟基－３，６－苯二磺酸与钛（Ⅳ）在ｐＨ３．５～４．５范围内发生高灵敏的显色反应，形成一种蓝色的三元胶束络合物，其最大吸收波长位于６５０ｎｍ，表观摩尔吸光系数ε＝１．２２×１０５·Ｌ·ｃｍ－１。络合物中钛（Ⅳ）与显色剂的组成比为１：２，钛含量在０～８．０μｇ／２５ｍＬ范围内符从比尔定律。间用于铝合金中微量钛的测定，结果满意。     

EFFECTS OF In_2O_3 DOPING AND SINTERING TEMPERATURE ON THE ELECTRICAL PROPERTIES OF ZnO VARISTORS

ZnOvaristorshaveexcellentnon--linearcurrent--voltage(IV)characteristicsandenergyabsorptionability,makingthemvaluableasvoltagesuppressersinpowersystemsandelectroniccircuitsLlj.Thecurrentvoltagedependenceofvaristorsisdescribedbytherelation:I=C(V)"whereIisthecurrentdensity,Caconstant,Vthevoltage,andathecoefficientofnon--linearity.ThestudyresultsshowthatpureZnOgrainhasnottheelectricalconductivity.Intheprocessofitspreparation,thedefectisproducedinthegrain,andmakeitann--typesemiconductor.Thecer…     

An Algorithm for Parametric Quadric Patch Construction

An algorithm for constructing arbitrary parametric quadratic quadric triangles in rational Bézier form is presented. The algorithm does not require the knowledge of the underlying quadric, an important property in view of applying this method for the interpolation of triangulated 3D data points. The algorithm consists of four steps starting with the arbitrary choice of the three corner points and corner weights of the patch, by then constructing a certain triangle and a tetrahedron by means of which the remaining inner control points and weights are obtained guaranteeing the resulting patch to lie on a quadric surface.