نتایج جستجو برای: isoconversional model
تعداد نتایج: 2104386 فیلتر نتایج به سال:
The present study aims to develop new energetic composites containing nanostructured nitrocellulose (NNC) or nitrated cellulose (NC), hydrazinium nitro triazolone (HNTO), and MgAl-CuO nanothermite. prepared formulations (NC/HNTO/MgAl-CuO NNC/HNTO/MgAl-CuO) were analyzed using various analytical techniques, such as Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), thermograv...
After around 50 years of development, the key substance known as polyethylene has been extremely influential in a variety industries. This paper investigates how materials have used domains water, packaging, and medicine to advance contemporary society order comprehend physical chemical alterations that undergoes after being subjected long-term environmental variables (e.g., temperature, light,...
Non-isothermal crystallization kinetics of polydioxanone (PDO), a polymer with well-established applications as bioabsorbable monofilar suture, was investigated by Avrami, Mo, and isoconversional methodologies. Results showed Avrami exponents appearing in a relatively narrow range (i.e., between 3.76 and 2.77), which suggested a three-dimensional spherulitic growth and instantaneous nucleation ...
Abstract In this work, the effect of functionalized hydroxyapatite (HAp-g-PEG) on thermal degradation behaviour and flammability polyoxymethylene copolymer (POM_C) was investigated. Organic–inorganic hybrid additive, obtained by grafting poly(ethylene glycol) HAp surface using 1,6-hexamethylene diisocyanate as a linker, has been incorporated into POM matrix through an extrusion process. TG anal...
The thermodynamics and kinetics of the structural phase transition from monoclinic VO2 (M) to rutile (R) vice versa were studied for particulate materials obtained by bead milling powder. Using wet milling, we decreased particle size powder ∼1 μm 129 nm. With progressive switching enthalpy 47 J g−1 29 due a loss crystallinity. using Friedman's differential isoconversional method. activation ene...
Abstract The goal of the current study is to investigate thermal degradation palm fronds (PF), olive leaves (OL), and wheat straw (WS) through pyrolysis calculate their kinetic data using TG-DTG DTA approaches. parameters were assessed isoconversional techniques like Ozawa-Flynn-Wall (OFW) Kissinger–Akahira–Sunose (KAS) methods, as well model-fitting integral method, which employs various diffu...
a one dimensional dynamic model for a riser reactor in a fluidized bed catalytic cracking unit (fccu) for gasoil feed has been developed in two distinct conditions, one for industrial fccu and another for fccu using various frequencies of microwave energy spaced at the height of the riser reactor (fccu-mw). in addition, in order to increase the accuracy of component and bulk diffusion, instanta...
در این پژوهش نانو ذرات هیبریدی نانو لوله کربنی- اکسید روی سنتز و شناسایی شده¬است و نتایج آنالیز دستگاهی tem, sem و ft-ir تشکیل نانو ذره هیبریدی را تایید می¬نماید. اثر هیبرید سازی نانو لوله کربنی با اکسید¬ روی سرعت تخریب حرارتی یک ترموست بر پایه dgeba مورد بررسی قرار گرفت. مطالعات مقایسه¬ای نشان داد که سرعت تخریب با هیبرید سازی نانو ذرات کاهش می¬یابد و از روش زیر تبعیت می¬کند. rpure dgeba > r m...
abstract: in the paper of black and scholes (1973) a closed form solution for the price of a european option is derived . as extension to the black and scholes model with constant volatility, option pricing model with time varying volatility have been suggested within the frame work of generalized autoregressive conditional heteroskedasticity (garch) . these processes can explain a number of em...
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