以meso四-(对磺基苯)卟啉为柱后衍生剂同时测定微量镉、汞、锌的离子色谱法

提出了以TPPS_4为柱后色谱衍生试剂的同时测定微量汞、镉和锌的离子色谱分析法,研究了影响衍生反应速度的因素。在含氯化钠的pH 10.3～12的硼酸钠缓冲介质中,以PAR催化TPPS_4与待测金属离子反应,以硅质键合相阳离子交换剂为固定相、酒石酸—氯化钠为流动相,于10min左右定量分离金属离子并将镉的淋洗顺序调至锌前。用于废水、硅酸盐和大米分析,结果满意。     

MULTIDENTATE LIGAND EXCHANGE KINETICS: REACTIONS OF AMINOCARBOXYLATO-FERRATE(Ⅲ) COMPLEXES WITH 4-(2-PYRIDYLAZO) RESORCINOL

The kinetics and mechanism of ligand substitution reactions of nitrilotriacetatoiron(Ⅲ), [Fe(NTA)], and N-(2-hydroxyethyl)-ethylenediaminetfiacetatoiron(Ⅲ), [Fe(HEDTA)], complexes with 4-(2-pyridylazo) resorcinol (Par) has been investigated at pH = 9.0±0.02, I= 0.1mol·1~(-1) (NaClO_4), and temp. = 25 ±0.1℃ and 30±0.1℃ respectively. The reaction has been studied spectrophotometrically at 496 nm. (λ_(max) of Fe(Par)_2). In both reactions the final product was [Fe(Par)_2]~-. The values of second order rate constants for NTA and HEDTA exchange reactions are (10.0±0.8)×10~1·mol~(-1)·s~(-1) and (2.7± 0.1)×10~(-1) 1·mol~(-1)·s~(-1) respectively. The reactions of NTA and HEDTA exchange were studied in the pH range 6-9.5 and 7-10.85 respectively. The rate of reacton of [Fe(NTA)] with HPar~- first increases with pH and then levels off. However, in the case of [Fe(HEDTA)] reaction, the rate increases monotonically with increase of pH in the specified range. The reverse reactions between [Fe(Par)_2     

IMPEDANCE CHARACTERISTICS OF POLYFURAN FILMS

Electrochemical impedance spectroscopy (EIS) was first used for the characterization of polyfuran (PFu) films thathad been formed electrochemically on an Au electrode. The polyfuran was measured in high oxidation state, intermediateoxidation state and reduction state, respectively. As the oxidation level is increased, the ionic conductivity of PFu/BF_4~-increases. And impedance studies on PFu show that the anion BF_4~- appears to be mobile with a high diffusion coefficient ofapproximately 10~(-8)cm~2· s~(-1).     

目标光学跟踪和指示系统

光学瞄准系统由瞄装准置(10)、控制板(50)和显示器(60)三部分组成。瞄准装置(10)包括稳定反射镜(12,14)、激光指示器(24),激光测距机(26)、共用光学系统(16)、电视光学系统(20)和电视摄象机(22)。控制板(50)包括手控旋扭(52,67,79)、距离、方位、俯仰读数器(75,76,77)、电子伺服控制电路(56)和光亮度-视场电子控制电路(58)。显示器(60)包括电视跟踪器和视频电路(54)。目标可手调定位,并由电视跟踪器电路(54)自动跟踪。目标距离可由激光测距机(26)测定,可用激光指示器(24)发射的激光光斑照射目标)以便用导弹攻击该目标。瞄准装置(10)由于与光学平台(11)组合(许多组件可安置在平台上),显得十分轻巧,得以安装在直升机旋翼的中心轴(5)上,成为桅杆式瞄准具。     

Components of Essential Oils in Different Parts of Daucus carota L. var. sativa Hoffm

Introduction Carrots,avegetablewithabundantnutrition,are therootsofDaucuscarotaL.var.sativaHoffm[1],whichisanumbelliferaeplant.Carrotsshowanti can cerandanti oxidationactivities.Theycanalsobeused topreventeyediseasesandimproveimmunity[2—11],thefactsareun…     

On Systems of Boundary Value Problems for Differential Inclusions

Herein we consider the existence of solutions to second-order, two-point boundary value problems （BVPs） for systems of ordinary differential inclusions. Some new Bernstein-Nagumo conditions are presented that ensure a priori bounds on the derivative of solutions to the differential inclusion. These a priori bound results are then applied, in conjunction with appropriate topological methods, to prove some new existence theorems for solutions to systems of BVPs for differential inclusions. The new conditions allow of the treatment of systems of BVPs without growth restrictions.     

PERIODIC BOUNDARY VALUE PROBLEMS FOR FIRST ORDER FUNCTIONAL DIFFERENTIAL EQUATIONS

In this paper, we investigate the periodic boundary value problems for nonlinear first order functional differential equations. By establishing a new comparison result, criteria on the existence of maximal and minimal solutions are obtained.     

EXISTENCE OF SOLUTIONS OF A FAMILY OF NONLINEAR BOUNDARY VALUE PROBLEMS IN L~2-SPACES

§ 1　Introduction and preliminariesThe equations related to the p- L aplacian operatorΔp have been studied in differentaspects[1— 4 ] sinceΔp arises from a variety of physical phenomena such as non Newtonianfluids,reaction- diffusion problems,etc.In this paper,the following equation(1) which canbe regarded as an extension of those in[1— 4 ]will be discussed:- div(α(gradu) ) +|u(x) |p- 2 u(x) +g(x,u(x) ) =f (x)　 a.e. onΩ-〈n,α(gradu)〉∈βx(u(x) ) ,a.e.onΓ . (1)　　More details can b…     

SiO_2-Al_2O_3担载的三钌乙烯酮原子簇化合物[PPN]_2[Ru_3(CO)_9(CCO)]的红外研究

[PPN]_2[Ru_3(CO)_9(CCO)]负载于SiO_2-Al_2O_3表面后其红外光谱显示了2124,2088,2060,2040和2010cm(-1)几个谱带,认为这是由于[Ru_3(CO)_9(CCO)]~(2-)同SiO_2-Al_2O_3的Si(OH)Al基团(3620 cm~(-1))反应生成了H_2Ru_3(CO)_9(CCO)/SiO_2-Al_2O_3     

Ultrasonic spectrum characterization of pig''''s pathological liver tissues

I.IntroductionCurrent1ythemajorityofcommcrcialultrasonicscannersutilizeon1ytheamplitudcinformationcarriedbytheechoesbackscatteredfrombiologicaltissuestoproduccandriageintimedomain.Potentia1lyusefulinformationinfrequencyd0maincontainedbytheechoesiscomp1ete1ydiscarded.Theu1trasonicspectrumanalysistechnique,whichcancompensatethislack,canpresentsomeusefulparametcrsinfrcqucncydomainusedinultrasonictissuecharacterization.Onthisbackgroud,asericsofworksonthisficldhavcbeendoneduringthepastdecadell-5l.…