Chemistry

1510 Submissions

[2] viXra:1510.0455 [pdf] submitted on 2015-10-28 09:24:08

Nonlinear Analysis of Transient Response in Thin Film based Ammonia Detector

Authors: Sai Venkatesh Balasubramanian
Comments: 4 Pages.

The nonlinear analysis of the transient response of a Gallium Oxide thin film based ammonia detector is performed using standard techniques such as Wavelet Analysis and Lyapunov Exponents, all of these targeted towards the resistance transient response as a function of ammonia concentration in ppm. While the distance plots reveal maximum asymmetry in the vicinity of 5ppm, positive Lyapunov Exponents obtained confirm the presence of chaos, while exhibiting a very prominent peak at 5ppm concentration levels. This trend is attributed to the moderate response and recovery times seen for the 5ppm concentration level, making it an ‘optimum’ level of sensitivity. It is opined that the results of nonlinear analysis presented in this work will serve as a stepping stone in the systematic benchmarking of various sensing mechanisms taking into account the nonlinearity in the underlying mechanisms.
Category: Chemistry

[1] viXra:1510.0074 [pdf] submitted on 2015-10-08 09:27:42

Investigation of the Influence of Potassium Permanganate on Denim Jeans Processing During Acid Wash

Authors: Elias Khalil, Atikur Rahman, Md. Solaiman
Comments: 5 Pages.

Denim Jeans finishing is one of the most important value added activities in the washing plant to meet buyer requirements. It is done by creating numerous effects on it. Potassium Permanganate (PP) is a strong oxidizing agent used to make vintage look with acid stone wash. This present investigation deals with the simultaneous effect of processing time and concentration of PP on the physical and mechanical properties of denim garments. Three 100% cotton denim jeans were separately treated with stone acid wash with simultaneous variation of processing time (1. 5, 2 & 2. 5 minutes) and of PP concentration (1. 5, 2 & 2. 5g/l) respectively after typical enzyme bleach wash. Various physical and mechanical properties (Hand feel, Weight, EPI, and PPI, Tensile strength, Shrinkage, Seam strength, Count & stiffness) were investigated before and after each treatment according to standard test methods. It was found that change in processing time and concentration reveals big difference in various properties between treated and untreated garments.
Category: Chemistry