Results 21 to 30 of about 131,773 (236)

Effects of Air Excess Ratio on Combustion and Engine Performance in a Homogeneous Charge Compression Ignition Engine fuelled with Hexane and N-Heptane Fuel Mixtures [PDF]

open access: yesGazi Üniversitesi Fen Bilimleri Dergisi, 2020
Homogeneous charge compression ignition engines are engines with low temperature combustion tendency and high thermal efficiency. The operating range of these engines, where there is no direct control over combustion, is limited because of knock and ...
Emre YILMAZ
doaj   +1 more source

Comparison between ethanol and hexane for oil extraction from Quercus suber L. fruits

open access: yesGrasas y Aceites, 2003
The aim of this study was to (i) evaluate the feasibility of replacing n-hexane with ethanol for the extraction of oil from Quercus suber fruits and (ii) optimize, at lab scale, sample preparation and extraction time for both solvents used (n-hexane vs ...
Suzana Ferreira-Dias   +2 more
doaj   +1 more source

Determination of Petroleum Oil in Soil by Fluorescence Spectrophotometry with Oscillatory Extraction

open access: yesYankuang ceshi, 2023
BACKGROUNDAs an important index of soil environmental quality, the determination of petroleum oil has become one of the must-test items in environmental monitoring.
Yuan LI, Xiaoyan DUAN, Yuge SHI, Gang LI
doaj   +1 more source

Multilayer Graphene Synthesized by CVD Using Liquid Hexane as the Carbon Precursor [PDF]

open access: yesWorld Journal of Condensed Matter Physics, 1(2011)157-160, 2011
We produce multilayer graphene by the Chemical Vapor Deposition (CVD) method at atmospheric pressure and 1000 {\deg}C, using flexible copper substrates as catalyst and liquid hexane as the source of carbon. We designed an optical device to measure the transmittance of the carbon films; with this information we calculate that the approximate number of ...
arxiv   +1 more source

Extraction of sweet and hot pepper and paprika oleoresin II. Hazards and critical control points and commercial requirements

open access: yesGrasas y Aceites, 2007
This paper reviews the hazards analysis and critical control points (HACCP) for the conventional extraction of paprika oleoresin, a product with potential to be produced in Africa and South America.
J. Pablo Fernández-Trujillo
doaj   +1 more source

Melting of hexane monolayers adsorbed on graphite: the role of domains and defect formation [PDF]

open access: yesLangmuir Letters 25, 6596-6598 (2009), 2009
We present the first large-scale molecular dynamics simulations of hexane on graphite that completely reproduces all experimental features of the melting transition. The canonical ensemble simulations required and used the most realistic model of the system: (i) fully atomistic representation of hexane; (ii) explicit site-by-site interaction with ...
arxiv   +1 more source

Simulations of the Chain Length Dependence of the Melting Mechanism in Short-Chained n-alkane Monolayers on Graphite [PDF]

open access: yesSurface Science, vol. 600, pp. 921-932 (2006), 2005
The melting transition in solid monolayers of a series of short-chained n-alkanes, n-octane (n-C8H18), n-decane (n-C10H22), and n-dodecane (n-C12H26) physisorbed onto the graphite basal plane are studied through use of molecular dynamics simulations.
arxiv   +1 more source

Nanoscale Liquid Crystal Lubrication Controlled by Surface Structure and Film Composition [PDF]

open access: yesPhys. Chem. Chem. Phys., 2018,20, 18737-18743, 2018
Liquid crystals have emerged as potential candidates for next-generation lubricants due to their tendency to exhibit long-range ordering. Here, we construct a full atomistic model of 4-cyano-4-hexylbiphenyl (6CB) nematic liquid crystal lubricants mixed with hexane and confined by mica surfaces. We explore the effect of the surface structure of mica, as
arxiv   +1 more source

Hexane neem leaf extract more potent than ethanol extract against Aspergillus flavus [PDF]

open access: yesUniversa Medicina, 2014
Background Aspergillus flavus is one of the causes of aspergillosis, with a high virulence and resistance to standard antifungals, resulting in a high mortality rate. Medicinal plants are increasingly used as they are relatively safer with minimal side
Jenny Hidayat   +3 more
doaj   +3 more sources

Optimization of N-hexane and Methanol Solvents on Total Phenol Levels of Gnetum gnemon Peel Extract in the Production of Biopesticide [PDF]

open access: yesE3S Web of Conferences, 2023
The excessive use of chemical pesticides has led to pest resistance and the accumulation of residues. Pest resistance occurs when pests become immune to pesticides and require higher doses or stronger pesticides for control.
Arifan Fahmi   +6 more
doaj   +1 more source

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