نتایج جستجو برای ' degradation '

Photocatalytic Degradation of Amoxicillin and Cephalexin from Aqueous Solution by ZnO and TiO2 Not undestanding and recognizing the factors affecting waters containing pharmaceutical compounds accurately will result in irrecoverable damages. For case in a point, the development of antibiotic resistance in bacteria affect the denitrification process and weaken methane-producing bacteria. To perform this investigation, after library studies and collecting the required information, for the feasibi...

In this study, dye sensitized commercial and prepared nano ZnO were used in photocatalytic degradation of two main greenhouse gases, methane and carbon dioxide in a batch reactor under visible light. ZnO nanoparticles were produced by sonochemical method in high frequency. In order to activate nanoparticles in visible region, copper phthalocyanine was used. Calcinated commercial and prepared nano ZnO, after immobilizing the dye were analyzed by FTIR, SEM and UV-vis. SEM images showed that the dy...

This paper is motivated by recent experimental research that demonstrated pharmacological efficiency of axonal transport drug delivery. The purpose is to develop a model of this process and to study how the rate of destruction of pharmaceutical agent complexes (PACs) affects their transport in the axon. The model includes two populations of PACs: PACs in the state when they are driven retrogradely (from the axon terminal toward the neuron soma) by dynein motors and PACs residing in the accumulat...

In this work, the zirconium dioxide nanocatalyst was primed by sol-gel method for degradation of Acid Red 40 (AR 40) solution in water. The effectiveness of the treatment method applied for the degradation of AR 40 based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized by using response surface modeling namely: pH, ZrO2 concentration and the initial AR 40 concentrations. The optimized values were obtained at the PH (11), ZrO2 conce...

Bacterial cellulose and plant cellulose possess the same molecular formula (C6H10O5)n, but have very diverse physical and chemical properties. Bacterial cellulose has significant advantages over plant cellulose in terms of purity, degree of polymerization, crystalline index, tensile strength and water holding capacity. This review primarily focuses on biosynthesis and bio-degradation/bioconversion of cellulose in bacteria, to ensure better understanding of cellulose production and its fate.

The sensitivity of various features that are characteristics of machine performance may vary significantly under different working conditions. Thus it is critical to devise a systematic feature extraction (FE) approach that provides a useful and automatic guidance on using the most effective features for machine performance prediction without human intervention. This paper proposes a locality preserving projections (LPP)-based FE approach. Different from principal component analysis (PCA) that a...

Asset health inspections can produce two types of indicators: (1) direct indicators (e.g. the thickness of a brake pad, and the crack depth on a gear) which directly relate to a failure mechanism; and (2) indirect indicators (e.g. the indicators extracted from vibration signals and oil analysis data) which can only partially reveal a failure mechanism. While direct indicators enable more precise references to asset health condition, they are often more difficult to obtain than indirect indicator...

Drag reducing polymers are evaluated by their resistance against mechanical shear forces. Higher amounts of drag reduction as well sustainability under turbulent conditions make a polymer as an efficient drag reducer. This study compares the performance of two drag reducing polymers with linear backbone under turbulent flow in a laboratory scale pipe line. Two commercially available water soluble well-known polymeric agents, polyacrylamide and polyethylene oxide, were added to the turbulent flow...

We study the global existence of solutions to a parabolic–parabolic system for chemotaxis with a logistic source in a two-dimensional domain, where the degradation order of the logistic source is weaker than quadratic. We introduce nonlinear production of a chemoattractant, and show the global existence of solutions under certain relations between the degradation and production orders.

 The research about how to obtain an organic/inorganic bio-composite with excellent comprehensive properties is an active research field. Nowadays, very few of the achievements were applied to the clinical use due to many reasons. In this work, the purpose was to get a three-phase composite with good compressive strength by using phosphorylated chitosan. Phosphorylated modification of chitosan would bring new properties such as metal chelating. Four phosphorylated chitosan/chitosan/hydroxya...