Analysis of cows' milk by cyclic voltammetry using a carbon electrode showed an oxidation wave at a potential around + 0.8V with respect to a saturated calomel electrode. The compound responsible for the wave was determined to be uric acid. The electrochemical assay of uric acid was without preliminary treatment of the milk. A concentration of 3.3 x 10v2 g&. milk was detectable. The method proved highly accurate, rapid and precise [coefficient of variation = 3%].

Recently, modern wireless communication applications are extended to call high frequency bands including millimeter waves for 5G systems. Therefore, the propagation properties of such waves in different media have attracted many researchers. In this work, the results of the Sparameters measurements of mortar with four thicknesses are obtained using a nondestructive free space measurement technique for the frequency bands from 8 GHz up to 32 GHz. The obtained results of the dielectric properties and loss factors for the prepared mortar samples are realized. The variation in both the reflection and transmission coefficients and the dielectric properties with curing time conditions of mortar structure is examined. The dielectric properties of water are realized using the proposed method to subtract the effects of water contents from the prepared mortar samples. The effects of the sample thickness and relaxation frequency are considered. The obtained measurements are compared to the simulated results based on a full wave simulation software package of CSTMWS algorithms. Finally, excellent agreements are achieved between the simulated and measured results.

In this manuscript, the S-parameters, reflection and transmission coefficients, of PTFE at different thicknesses for microwave absorption applications were investigated in conjunction with WR90 T/R rectangular waveguide. Subsequently, the reflection and absorption shielding effectiveness SER and SEA values were calculated using the measured S-parameters values, in which an inversely proportional relation was found. Furthermore, using Nicholson-Rose-Weir (NRW) and Finite Element Method (FEM) approaches, the measured S-parameters were validated. Herein, the mean relative errors were calculated; in particular, it was found that the FEM delivers an upright agreement with the measured data in comparison to the utilized NRW. This suggests the usefulness of the FEM approach as a low-cost alternative for the actual laboratory investigation.

A sample, fast, precise and accurate spectrophotometric method to the quantitative determination of metoclopramide hydrochloride (MCP) in pure and pharmaceutical preparations, a simple, sensitive and high-purity method has been developed. This method is based on the diazotization of the primary amine group of metoclopramide hydrochloride by reaction hydrochloric acid with sodium nitrite followed by conjugation in an alkaline medium with 8-hydroxyquinoline against the reagent blank. The effect of several acids like hydrochloric, nitric, phosphoric, and sulfuriHc acid. That found hydrochloric acid the most excellent acid, to give the maximum absorption and sensitivity and the best volume NaNO2 solution about 1 and 3 mL of an 8-hydroxyquinoline reagent gives high intensity and stability to the color formed, also azo dye give a maximum absorption and best sensitivity after 10 minutes and the color remains stable about 1-hour. Where the concentration range was 1-20 mg/L, it was found that it obeys law Beer-Lambert correlation coefficient (R2 =0.9997). They have a detection limit LoD (0.274 μg mL-1) and limit of Quantitation LoQ (0.915 μg mL-1), respectively. This method has also been used in many pharmaceutical preparations (capsules, tablets and syrup) to determine the drug metoclopramide.