Abstract:本文研究了在十二烷基硫酸钠(SDS)-Tween-80阴-非混合表面活性剂存在下,Fe(Ⅱ)与2-(2-噻唑偶氮)-5-二乙氨基苯甲酸(TAEB)的高灵敏显色反应.在pH3.8～5.5的HAc=NaAc缓冲介质中,形成稳定的红紫色胶束配合物,最大吸收在波长610nm处,表观摩尔吸光系数ε_(610)值达1.5×10~5,为目前噻唑偶氮胶束光度法测定铁(Ⅱ)的最灵敏方法,应用于地面水、人发和铝合金中微量铁的测定,结果满意.

Abstract:This paper analyses the requirements for the quantitative determination of oxidizing liquid and water sample in the COD measurement.By using the constant volume bottle,the squirm pump,and constant current-time, a method is proposed to realize the automati

Abstract:In this paper,the static stable process of one machine to infinite bus power system under small disturbance was analysed. Based on the related nonlinear swing equations, modern dynamic system theory was applied to the analysis of this static stable proces

Abstract:A novel family of Q-enhanced second-order lowpass, highpass and bandpass SC filters are derived from Bach's active RC lowpass and highpass filters by using the recently proposed passive Q-enhancement technique. Especially, the new bandpass SC filters, whi

Abstract:The two-valued unapproximable trapdoor predicate of probabilistic encryption is extended to the multivalued unapproximable trapdoor predicate in this paper. The corresponding encryption and deoryption algorithm are given. It is proved that the extended pr

Abstract:In this paper, by analysing the results obtained in the dynamic test we find out the vibration vulnerable areas and main vibration resources of the type MS 1320 high-speed cylindrical grinding machine. A basis is thus provided for designing the high-speed

Abstract:The CEDS-MD system is a computer-aided design system especially developed for designing the structure of colour TV cases, In this paper, the classification of the data processed by this system is presented and the selection of representation model in this

Abstract:The conception of economical life is introduced for the small and middle-sized power transformers (SMSPT). Based on the evaluation of the loss and maintennace costs as well as the reliability worth,a mathematical model is developed for determining the eco

Abstract:In this paper, the model of hierarchy analysis was developed for the optimal serial analysis of the objective market for the export electronic products of China. The optimal estimation was used to solve the model, and the optimal series of export objectiv

Abstract:The law of propagation and attenuation of the transient ground waves is studied. A new method is presented to analyse the far-field harmonic waves. A near-field attenuation formula is also advanced. Agreement is found with the results obtained in the mode

Abstract:In this paper, the multiple buckled state of the orthotropic rectangular plate with a double eigenvalue is studied by the modern bifurcation method. The corresponding calculated results are also given.

Abstract:If the singular point of linear differentiaI equations is the center, after adding nonlinear terms the singular point may still be the center or become a focus owing to the change of the topological structure. This paper discusses the global structure of

Abstract:The coulostatic perturbation technology proposed in this paper is a kind of interruptive relaxation method which is characterized by the high measuring speed (usually a few seconds needed)and will not be influenced by the high resistance media. This techn

Abstract:In this paper, we study the mechanism of eliminating COD and LAS from the waste water of synthetic detergent with different forms of poly-FeCl_3. The optimum technological conditions for the coagulation treatment are determined, which make the rate of eli

Abstract:In this paper, the stress distribution of the channeled graphite seals (or pressure containers) is analyzed by means of elasticity theory and structural mechanics. The optimal method is developed to calculate the strength and the thickness of the channele

Abstract:This paper shows that the neutrino does not violate the law of parity conservation, P and CP violation comes from the vacuum. If we take vacuum into account, the law of P.C.T conservation is universally true.

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Abstract:In this paper, a new biased estimate, which is called the united regression estimate, is proposed for the regression coeffients. Under the given conditions, the proposed estimate, which is found to be superior to the least squares estimate, the principal

Abstract:This paper discusses a class of quasilinear vector-valued obstacle problems. Under some hypotheses, the existence and the regularity of the solution are obtained.