An extension of weighted generalized cumulative past measure of information

Ricerche di Matematica - In this paper, we consider a shift-dependent measure of generalized cumulative entropy and its dynamic (past) version in the case where the weight is a general non-negative...     

Diels-Alder Reaction with Transition Metal/Zeolites

Transition metal/Y zeolites were prepared by microwave solid state and aqueous solution ion-exchange methods. The activity of these zeolites was investigated in a Diels–Alder reaction of cyclopentadiene and maleic anhydride, anthracene and maleic anhydride. The yield of these reactions increased in order of (NaY < Fe²⁺Y < Fe³⁺Y < MnY < CuY ≈ NiY < CoY ≈ CrY < ZnY) for both methods. The aqueous solution ion-exchanged zeolites showed higher activity in comparison to solid state exchange. About 65–70% yield was observed for the Diels–Alder reaction with ZnY Zeolite. Endo-selectivity was observed for these reactions. Received in final form: 14 January 2005     

Morphine Sensing by a Green Modified Molecularly Imprinted Poly L‐Lysine/Sodium Alginate‐activated Carbon/Glassy Carbon Electrode Based on Computational Design

A different molecularly imprinted composite film with the exploit of computational design is synthesized. The proposed composite is used for electrode modification to determine morphine. The ratio of monomer to template in optimum condition was obtained 4. The modification of the electrode was achieved by electropolymerizing L‐lysine in the presence of morphine on the surface of sodium alginate and activated carbon (SA‐AC) on glassy carbon electrode (GCE). The SA‐AC composite with special surface area suits for making sensitive sensors. Morphine showed an anodic peak in buffer solution of phosphate (pH=6.0) on MIP/SA‐AC/GCE. The optimization of the practical factors on the response and electrochemical behavior of template morphine on the modified electrode were precisely surveyed. The DPV outcomes exhibit high sensitivity for morphine detection within 0.1–1000.0 μM and limit of detection as 48 nM (S/N=3). The application of this disposable sensor in the case of urine samples was quite satisfactory.