Vol. 12 No. 1 (2022) | Bulletin of Natural Sciences Research

Open Access Original Scientific Paper

SPECTRAL CHARACTERISTICS OF TWO PARAMETER FIFTH DEGREE POLYNOMIAL CONVOLUTION KERNEL

by Zoran Milivojević, Nataša Savić, Bojan Prlinčević

In this paper, the spectral characteristic of a polynomial two parameter convolutional fifth - order interpolation kernel is determined. The spectral characteristic is determined as follows. First, the kernel is decomposed into components. After that, the spectral characteristics of each kernel component were calculated using the Fourier transform. Finally, the spectral characteristic of the interpolation two parameter kernel using a combination of the spectral components of the kernels and the kernel parameters, α and β, is formed. Through a numerical example and a graphical representation of the spectral characteristics of the one parameter and two parameter kernels, greater similarity of the spectral characteristics of the 2 P kernel, relative to the ideal box characteristic, is shown.

View Full-Text DOI 10.5937/bnsr12-38771 Published: 19 Jul 2022

Open Access Original Scientific Paper

ANALYSIS OF STATIC BEHAVIOR OF ION SENSITIVE FIELD EFFECT TRANSISTOR FOR PH MEASUREMENTS

by Tijana Kevkić, Reshmi Maity, Dragana Todorović, Biljana Vučković, N. P. Maity

The Ion-Sensitive Field-Effect Transistor (ISFET) is one of the most popular pH sensors traditionally using to measure hydrogen ion concentration (pH) of the electrolytic solutions. It is developed from Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) by replacing gate electrode with an electrolytic solution to be tested, and a reference metal electrode immersed in that solution. Basic principle of ISFET operation is based on that of standard NMOS structure in conjunction with the insulator-electrolyte capacitor as described in this paper. The site-binding theory (generalized to two kinds of binding sites), together with the Gouy - Chapman- Stern model for the potential profile in the electrolyte, is coupled to the MOS physics. As a result, an approximate analytical model which completely describes static behavior of the ISFET is obtained. The developed description can serve as useful tool for understanding many contemporary biosensors based on original ISFET structure which has broad application in biomedicine, biological, chemistry and environmental areas.

View Full-Text DOI 10.5937/bnsr12-37850 Published: 15 Jul 2022

Open Access Original Scientific Paper

GENERALIZED α-MIN SPECIAL TYPE CONTRACTION RESULTS ON 2-MENGER SPACES

by Samir Kumar Bhandari, Sumit Chandok

The goal of this paper is to present some novel probabilistic α-minimum contraction results on probabilistic 2-metric spaces. Our findings are based on probabilistic 2-metric spaces, which are the probabilistic generalisations of 2-metric spaces. An illustrative example backs up our findings.

View Full-Text DOI 10.5937/bnsr12-34903 Published: 23 Jun 2022

Open Access Original Scientific Paper

EXISTENCE OF INVARIANT POINTS AND APPLICATIONS TO SIMULTANEOUS APPROXIMATION

by Sumit Chandok, T. D. Narang

For the set of ε-simultaneous approximation and ε-simultaneous coapproximation, we derive certain BrosowskiMeinardus type invariant point results in this paper. As a consequence, some results on ε-approximation, εcoapproximation, best approximation, and best coapproximation are also deduced.

View Full-Text DOI 10.5937/bnsr12-33064 Published: 23 Jun 2022

Open Access Original Scientific Paper

IDENTIFICATION AND DETERMINATION OF 2,5-DIMETOXY-4-BROMOPHENETHYLAMINE (2C-B) IN REAL SAMPLE BY GC-MS METHODS AND DERIVATIZATION AFTER SPE PREPARATION

by Vera Lukić, Ružica Micić, Živana Radosavljević

The abuse of new psychoactive substances is attracting a lot of attention from the world public. There is an increasing use among young people, who are not aware of the harmful effects of this substances. Some of these substances may have been around for years, but have reemerged in the market in altered chemical forms and launched as legal alternatives to common drugs of abuse. This paper describes application of gas chromatography coupled with mass spectrometry method (GC-MS) to identify 2,5-dimetoxy-4-bromophenethylamine (2C-B) compound in urine sample after solid phase extraxtion and derivatization with N-methyl-bis-trifluoroacetamide (MBTFA). Gas chromatographic separation of TFA derivative of 2C-B (2C-B TFA) was successfully performed using DB-5MS capillary column (5% diphenyl-95% dimethilsiloxane). Selected ion monitoring (SIM) technique was used for qvantitative analyses wich was performed using matrix mached calibratores, whereby good results were achieved. Urine sample wich contained 2C-B was obtained within International Quality Assurance Programme - International Collaborative Exercises (ICE) program organized by the scientific department of United Nations Office on Drugs and Crime (UNODC). The aim of this study was to develop a simple and sensitive method of gas chromatography mass spectrometry (GC-EI-MS) for the identification, extraction and quantitative analysis of 2C-B in the urine sample, which is near the blood remains a priority analyzed matrix in clinical and forensic toxicology.

View Full-Text DOI 10.5937/bnsr12-28145 Published: 16 Mar 2022