Journal of Thermal Analysis and Calorimetry
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View factor for radiative heat transfer calculations between triangular geometries with common edge
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 4523-4539 - 2023
In radiation heat transfer calculations, the view factor between surfaces is an element of vital importance. Currently, the available technical literature does not have an analytical expression that allows the view factor to be directly computed for combinations of triangular surfaces. An analytical view factor solution requires the addition of multiple integrals, given the changes in the integrat......
The 30th anniversary of the commission for thermal analysis and calorimetry of the Romanian academy and 65 years of thermal analysis and calorimetry in Romania
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 4567-4572 - 2023
Comparison of NIR spectroscopy coupled to chemometrics and derivative thermogravimetry for relative dating of human fossil bones
Journal of Thermal Analysis and Calorimetry - Tập 130 - Trang 559-565 - 2017
The possibility of using near-infrared spectroscopy (NIR) coupled to chemometric exploratory data processing in order to obtain a fast, cheap and nondestructive dating of human fossil bones is presented and discussed. The proposed approach has been applied to the differentiation of human fossil bones from two necropolises in the Middle Nile (Saggai and Geili). Principal component analysis of the s......
Kinetic study of dehydration of calcium oxalate trihydrate
Journal of Thermal Analysis and Calorimetry - Tập 124 - Trang 151-158 - 2015
The dehydration of calcium oxalate trihydrate was studied using DSC method and open sample crucibles. The dehydration proceeds in two steps where first two molecules of water are released around 80 °C and consequently the last molecule of water is released at a temperature around 130 °C. The kinetic analysis of overlapping peaks was performed, and the apparent activation energy, pre-exponential fa......
Study of stability and drug-excipient compatibility of estradiol and pharmaceutical excipients
Journal of Thermal Analysis and Calorimetry - Tập 120 - Trang 839-845 - 2014
Estradiol (E2) is the main drug used in menopause therapy. This study aimed to evaluate the drug-excipient compatibility of binary mixtures (BMs) (1:1 BMs, w/w), initially by differential scanning calorimetry (DSC), and subsequently, by complementary techniques such as X-ray powder diffraction (XRPD) and high performance liquid chromatography (HPLC) if there was any evidence of interaction. The sa......
Thermal behavior of Ca2+ and Cu2+ oxalates obtained by precipitation in homogeneous solution from dimethyl oxalate hydrolysis
Journal of Thermal Analysis and Calorimetry - Tập 117 - Trang 1145-1150 - 2014
Mixed calcium and copper oxalates, with different proportions of Ca2+ and Cu2+ ions, were precipitated by dimethyl oxalate hydrolysis in homogeneous solution. The compounds were evaluated by means of scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetry (TG), and differential thermal analysis (DTA). The results suggested quantitative precipitation without solid solut......
Betulonic acid—cyclodextrins inclusion complexes
Journal of Thermal Analysis and Calorimetry - Tập 138 - Trang 2787-2797 - 2019
Betulonic acid (BA) is a pentacyclic lupane-type triterpenoid possessing valuable pharmacological activities, exhibiting very low water solubility. Inclusion complexes between the substance and cyclodextrins (CDs) were obtained in order to improve its solubility and consequently its bioavailability. The aim of this study was to investigate the guest–host interaction of BA with γ-cyclodextrin (γ-CD......
Numerical investigation of the mixed convection of a magnetic nanofluid in an annulus between two vertical concentric cylinders under the influence of a non-uniform external magnetic field
Journal of Thermal Analysis and Calorimetry - Tập 138 - Trang 1745-1759 - 2019
In the present study, the hydrothermal behavior of a magnetic nanofluid (4 vol% magnetite–water) in the annular space between two vertical circular cylinders under the influence of a linear magnetic field with negative gradient is numerically investigated. In particular, the effects of the Grashof number (1000 ≤ Gr ≤ 50,000), Reynolds number (20 ≤ Re ≤ 200), and the annulus radius ratio (1.5 ≤ Do/......
Estimating ignition time of solid exposed to increasing-steady thermal radiation
Journal of Thermal Analysis and Calorimetry - Tập 147 - Trang 3763-3778 - 2021
This contribution presents an alternative methodology to predict ignition of solid under increasing-steady heat flux, which may be irradiated from the smoke layer with time-dependent temperature. An approximate analytical solution, using ignition temperature criterion, is proposed and two typical heating conditions, linear- and t2-steady heat fluxes, are emphasized. The critical increasing rate of......
Significance of bioconvection in chemical reactive flow of magnetized Carreau–Yasuda nanofluid with thermal radiation and second-order slip
Journal of Thermal Analysis and Calorimetry - Tập 140 - Trang 1293-1306 - 2020
Several non-Newtonian fluids are of practical interest, and it is fascinating to examine the rheology of such fluids with various flow features. In this study, the flow of Carreau–Yasuda nanofluid has been analyzed in the presence of gyrotactic microorganisms. The impressive features of nanofluid are displayed by abiding the thermophoresis and Brownian motion aspects. The second-order velocity sli......
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