Numerical investigation of full scale coal combustion model of tangentially fired boiler with the effect of mill ducting

In this paper a full scale combustion model incorporating upstream mill ducting of a large tangentially fired boiler with flue gas recirculation was examined numerically. Lagrangian particle tracking was used to determine the coal particle paths and the Eddy Dissipation Model for the analysis of the gas phase combustion. Moreover volatiles and gaseous char products, given off by the coal particles were modelled by Arrhenius single phase reactions and a transport equation was solved for each material given off by the particles. Thermal, prompt, fuel and reburn NO _x models with presumed probability density functions were used to model NO _x production and the discrete transfer radiation model was used to model radiation heat transfer. Generally, the findings indicated reasonable agreement with observed qualitative and quantitative data of incident heat flux on the walls. The model developed here could be used for a range of applications in furnace design and optimisation of gas emissions of coal fired boiler plants.     

Reliable Recurrence Algorithm for High-Order Krawtchouk Polynomials

Krawtchouk polynomials (KPs) and their moments are promising techniques for applications of information theory, coding theory, and signal processing. This is due to the special capabilities of KPs in feature extraction and classification processes. The main challenge in existing KPs recurrence algorithms is that of numerical errors, which occur during the computation of the coefficients in large polynomial sizes, particularly when the KP parameter (p) values deviate away from 0.5 to 0 and 1. To this end, this paper proposes a new recurrence relation in order to compute the coefficients of KPs in high orders. In particular, this paper discusses the development of a new algorithm and presents a new mathematical model for computing the initial value of the KP parameter. In addition, a new diagonal recurrence relation is introduced and used in the proposed algorithm. The diagonal recurrence algorithm was derived from the existing n direction and x direction recurrence algorithms. The diagonal and existing recurrence algorithms were subsequently exploited to compute the KP coefficients. First, the KP coefficients were computed for one partition after dividing the KP plane into four. To compute the KP coefficients in the other partitions, the symmetry relations were exploited. The performance evaluation of the proposed recurrence algorithm was determined through different comparisons which were carried out in state-of-the-art works in terms of reconstruction error, polynomial size, and computation cost. The obtained results indicate that the proposed algorithm is reliable and computes lesser coefficients when compared to the existing algorithms across wide ranges of parameter values of p and polynomial sizes N. The results also show that the improvement ratio of the computed coefficients ranges from 18.64% to 81.55% in comparison to the existing algorithms. Besides this, the proposed algorithm can generate polynomials of an order ∼8.5 times larger than those generated using state-of-the-art algorithms.     

Development and Validation of Stability-Indicating Assay Method for a Novel Oxazolidinone (PH-192) with Anticonvulsant Activity by Using UHPLC-QToF-MS

The treatment of seizure disorders with currently available pharmacotherapeutic agents is not optimal due to the failure of some patients to respond, coupled with occurrences of side effects. There is therefore a need for research into the development of new chemical entities as potential anticonvulsant agents, which are different structurally from the existing class of drugs. We recently identified a novel triazolyl-oxazolidinone derivative, PH-192, as a potential anticonvulsant agent. PH-192 demonstrated protection comparable to phenytoin against both chemically- and electrically-induced seizures in rodents with little or no central nervous system side effects. However, PH-192 did not exhibit protection beyond 30 min; therefore, we decide to investigate a stability-indicating assay of PH-192 in plasma and other solutions. A reliable and validated analytical method was developed to investigate the stability of PH-192 for 90 min in human plasma, acidic, basic, and oxidative conditions, using a Waters Acquity ultra high-performance liquid chromatography (UHPLC) system with a quaternary Solvent Manager (H-Class). A simple extraction method indicated that PH-192 was stable in human plasma after 90 min at 37 °C, with more than 90% successfully recovered. Moreover, stress stability studies were performed, and degradants were identified using LC-QToF-MS under acidic, basic, and oxidative simulated conditions.     

Synthesis and labeling of p-NH2-Bn-DTPA-(Dabcyl-Lys6,Phe7)-pHBSP with 99mTc as a radiopeptide scintigraphic agent to detect cardiac ischemia

Journal of Radioanalytical and Nuclear Chemistry - Myocardial ischemia and infarction represent a major health burden worldwide, but their immediate diagnosis can reduce mortality and healthcare...     

Ziziphora clinopodioides Lam leaves aqueous extract mediated synthesis of zinc nanoparticles and their antibacterial,antifungal, cytotoxicity,antioxidant, and cutaneous wound healing properties under in vitro and in vivo conditions

LamZiziphora clinopodioides Biosynthesis of metal nanoparticles using plant medicine is under exploration is due to wide biomedica applications and research interest in nanotechnology, the recent study was assessing green synthesis of zinc nanoparticle using ), the use of plant material Ziziphoraleaves extract (ZnNPs@ not only makes the process eco‐friendly but also the abundance makes it more economical. Also, in this study, Vis. and– were characterized using different techniques including UVZiziphora were synthesized in aqueous medium using the plant extract as stabilizing and reducing agents. The synthesized ZnNPs@Ziziphora conditions. ZnNPs@in vivo and in vitro under Ziziphorawe investigated the therapeutical properties of ZnNPs@ FT‐IR spectroscopy, . SEM images exhibited a uniform spherical morphology in size of 32.34 Thermal Gravimetric Analysis (TGA)ray diffraction (XRD), scanning electron microscopy (SEM), and Energy Dispersive X‐ray Spectrometry (EDS), and‐X Escherichia coli, and Pseudomonas aeruginosa, Salmonella typhimurium part of this study, these nanoparticles indicated excellent antibacterial properties against Gram‐negative bacteria (in vitronm for the biosynthesized nanoparticles. In the biological , andCandida krusei, Candida albicans, Candida glabrata), antifungal potentials against Bacillus subtilis, andStaphylococcus aureus, Streptococcus pneumoniaO157:H7) and Gram‐positive bacteria ( leaves aqueous extract can be used to yield zinc nanoparticles with a significant amount of antibacterial, antifungal, antioxidant, and cutaneous wound healing properties without any cytotoxicity.Z. clinopodioides ointment ameliorated the cutaneous wounds with increasing the levels of wound contracture, vessel, hydroxyl proline, hexosamine, hexuronic acid, fibrocyte, and fibrocytes/fibroblast rate and decreeing the wound area, total cells, and lymphocyte compared to other groups in rats. The results of UV, FT‐IR, XRD, FE‐SEM, EDS, and TGA confirm that the Ziziphora part of our experiment, ZnNPs@in vivo, non‐cytotoxicity effect against human umbilical vein endothelial cells, and antioxidant activity against DPPH. In the biological Candida guilliermondii     

Description of 160Dy nucleus by partial dynamical SU(3) symmetry

We considered the characteristic features of SU(3) partial dynamical symmetry in the interacting boson model framework to show the relevance of such intermediate symmetry structure in the nuclear spectroscopy of the ¹⁶⁰Dy nucleus. The predictions of SU(3)-PDS for the energy spectrum and the transition probabilities were compared with the most recent experimental data and an acceptable degree of agreement was achieved.     

A novel sensor for simultaneous determination of dopamine and uric acid using a new MFI-type zeolite prepared by microwave-assisted synthesis

Abstract  

This paper describes microwave-assisted synthesis of a new MFI-type zeolite, Zeolite Secony Mobile (ZSM-5), its characterization by X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), and its application for fabrication of a modified carbon paste electrode. This novel electrode was employed for sensitive and simultaneous determination of dopamine and uric acid at biological pH (pH 7.0). The results show that this zeolite-modified carbon paste electrode significantly improves the electron transfer rate and reduces the overpotential of dopamine and uric acid oxidation without any fouling effect due to deposition of their oxidized products. The linear analytical curves were obtained in the ranges of 9.0 × 10⁻⁶–4.9 × 10⁻⁴ and 8.0 × 10⁻⁶–9.0 × 10⁻⁴ M for dopamine and uric acid, respectively, by using differential pulse voltammetry based on oxidation of these biomolecules. The detection limits (2σ) were determined for dopamine and uric acid as 7.9 × 10⁻⁶ and 7.1 × 10⁻⁶ M, respectively. This method has been successfully employed for quantification of dopamine and uric acid in real samples.     

Affine Metrics and Algebroid Structures: Application to General Relativity and Unification

Affine metrics and their associated algebroid bundle are developed. These structures are applied to the general relativity and provide a mathematical structure for unification of gravity and electromagnetism. The final result is a field equation on the associated algebroid bundle that is similar to Einstein field equation but contains Einstein field equation and Maxwell equations simultaneously and contains a new equation that may have new results.     

Nano and micro porous GaN characterization using image processing method

This work reports the fabrication of porous N-GaN structures and their quantitative structural characteristic study based on mathematical morphology analysis using scanning electron microscope (SEM) images. The evaluation of N-GaN quality is carried out by performing a nondestructive investigation of its micro and nanostructures, which in turn is performed by adapting image analysis techniques to obtain rapid, objective, and quantitative information. The algorithm used in this work was implemented using the MATLAB software. Using the algorithm made obtaining the distribution of maximum, minimum, and average radius of the pores in the N-GaN structures possible. Calculating the area occupied by the pores allowed the porosity of the structures to be obtained. The quantitative results were obtained and related to the fabrication process characteristics, showing their reliability and potential to be used for controlling the pores in the formation process. Thus, this technique can provide a more accurate determination of pore sizes and pore distributions.