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Mar 28, 2023Open Access
GCOOH-WO 3 composites mixed with different amounts of Graphene-COOH functionalized (GCOOH) (0, 0.05, 0.1 and 0.2 wt%) were prepared by hydrothermal method at 180°C for 10 h and 24 h. The asprepared WO 3 and GCOOH-WO 3 composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy and other equipment. The effect of the amount of graphene in the composites on the gas-sensing responses and the gas-sensing selecti...
Mar 28, 2023Open Access
The stannic oxide (SnO 2) was modified using Quasi-Molecular imprinting method. The morphology and structure of the modified SnO 2 were characterized by X-ray diffraction (XRD), and transmission electron microscopy (SEM). The gas-sensing performance of the modified and unmodified SnO 2 sensors was compared, and the mechanism of MIP technique in improving the gas-sensing performance of SnO 2 was discussed. The selective test results showed that the improved...
Dec 06, 2021Open Access
The purpose of the proposed research is to ensure that the value of the distinction is adjusted to each application by using various supplements to separate and clean up biological objects. The work presents the results of studies of the phase diagram of the biphasic system composed of polyethylene glycol (PEG)/sodium citrate-water and the effect of inorganic salts (sodium sulfate, sodium carbonate, sodium nitrate, potassium sulfate, potassium chloride, potassium iodide, potassium bromide) on th...
Feb 20, 2017Open Access
The lubricating oils are essential for operating engine with high efficiency. Therefore, the physical properties of oil such as flash point, pour point, kinematic viscosity, specific gravity and the American Petroleum Institute are necessary to be studied to indicate good quality of the lubricating oil. In this study, we compare the physical properties of two virgin oils with re-refining oil. ...
Sep 13, 2016Open Access
The vapor pressure (VP) of 87 grade gasoline was
measured using an enhanced VP acquisition system over a temperature range of
approximately 19.0℃ (292.2 K) and 69.0℃ (342.2 K). The empirical data were used to predict the
thermodynamic entities the enthalpy of vaporization (ΔHvap) and the entropy of vaporization (ΔS ...
Mar 29, 2016Open Access
High-temperature and pressure boundaries of the liquid and gaseous states
have not been defined thermodynamically. Standard liquid-state physics texts use
either critical isotherms or isobars as ad hoc boundaries in phase diagrams. Here
we report that percolation transition loci can define liquid and gas states, extending
from super-critical temperatures or pressures to “ideal gas” states. Using computational
methodology described previously we present results for the thermodynamic...
Sep 28, 2015Open Access
The objective of this investigation was to develop a vapor pressure (VP) acquisition system and methodology
for performing temperature-dependent VP
measurements and predicting the enthalpy of vaporization (Δ Hvap) of volatile organic compounds, i.e. VOCs. High quality VP data were acquired for acetone, ethanol,
and toluene. VP data were also
obtained for water, which served as the system calibration standard. The
empirical VP data were in
excellent agreement with its refe...
Apr 30, 2015Open Access
The task was to find out the most appropriate expandable graphite
intercalation compound GIC for intumescent seals. The application in fire seals
required GICs, which exerted high expansion at low burning rates. Therefore
graphite was treated with nitric, sulphuric, phosphoric acids and ferric
chloride. Phosphoric acid with its flame retardant properties was the
favourite, but graphite treated with it, did not exfoliate, therefore
expandable graphite was post treated with phosphoric acid. Elemen...
Sep 10, 2014Open Access
The internal combustion engine needs to be assessed in terms of thermal
loads that come from different sources. Thermal analysis is important in both
the design and the evaluation of the conditions of the engine. Interesting good
results are obtained by association studies using non-invasive methods such
as Infrared and mathematical modelling based on the boundary conditions
identified in the experiment. The paper presents a methodology for measuring
the surface temperature fields outside of the...
Aug 12, 2014Open Access
Reduction
kinetics of titanomagnetite concentrate briquettes produced from Rossetta-llmenite
ore via 1.5 liter/min hydrogen flow rate were investigated at different
temperatures ranging from 600℃ to 950℃. It was found that the best reduction
properties were found at 950℃, so the kinetic models shown by the briquettes
at this temperature maybe: Diffusion control or Diffusion through ash layer
(crank-cins ...
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