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…temporal consistency for drifting droplets, and the RANSAC fitting rejects soot-tail pixels as geometric outliers. The method is validated by 19,537 flame images of n-heptane, n-decane, and n-octane droplets with varying initial diameters. Compared with manual-reference measurements, the proposed w…
…identical scaling, binning and hashing semantics, a bitwise-inert retrieval hook in the integrator, and a fully native evaluation path for the chemical source terms. On 33 n-heptane autoignition mechanisms spanning 56-459 species plus the detailed 654-species mechanism, the hash-tabulated C++ G-Sch…
…First, measurements in air demonstrate the precision of the method and allow detection of a nanometric wetting capillary. Second, we analyse dynamic evaporation of a confined heptane droplet down to 0.1 pL volume. The method provides a time-resolved reconstruction of the meniscus geometry throughou…
…) at 298.15 K are reported for 2-undecanone + heptane, or + octane, or + decane, or + dodecane, or + tetradecane mixtures at 95 kPa. Densities and $H_{\text{m}}^{\text{E}}$ were measured using, respectively, a densitometer Anton Paar DMA 602 and a Tian-Calvet micro-calorimeter. $H_{\text{m}}^{\text…
The role of a transverse liquid n-heptane jet in initiating and stabilizing liquid n-heptane oblique detonation waves (ODWs) in a confined model combustor was computationally investigated in the present work. The jet-to-inflow momentum ratio, J, was identified as the primary control parameter. Under…
…) for iodobenzene, or 1-iodonaphthalene + heptane, + decane, + dodecane, or + tetradecane mixtures at 298.15 K and 93 kPa have been measured using a Tian-Calvet micro-calorimeter. The values of $H_{\text{m}}^{\text{E}}$ are positive and indicate that interactions between like molecules are prevalen…
We previously reported apparent ideal diamagnetism at ambient conditions in a graphene-n-heptane-permalloy system. At the same time, the experiments revealed inconsistent behavior, including signal freezing and occasional paramagnetic responses. Further measurements performed without graphene produc…
…interactions are strong but do not contribute significantly to the excess molar enthalpy, as the values are large and positive, and comparable to those of (glyme + n-heptane) systems. The excess molar volumes are small or even negative (in the case of the mixture with u = 4), indicating that they a…
Vaporization of n-heptane and Freon 13 droplets suspended in heated air stream at high pressures
Stephen S. Washburne and John H. MacMillan, Temple University. Interaction of Carbonyl Compounds with Organometallic Azides, Part V., Sorboyl Chloride and its Conversion to an Alpha-Pyridone, J. Org. Chem., Vol. 38, p 2982, 1973. Electrocyclic ring closure of alpha,beta-cis-1,3-pentadienyl isocyanat…
In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern the…
Characteristic velocities of six single-element injectors that separately varied propellant spreading and mixing were measured over a range of oxidant-fuel weight ratios of 2 to 7. Hydrogen inlet temperature was -320 degrees F. Injectors that both mixed and spread the propellants had the highest cha…
The flame velocities of 37 pure hydrocarbons including normal and branched alkanes, alkenes, and alkynes; as well as benzene and cyclohexane, together with the experimental technique employed are presented. The normal alkanes have about the same flame velocity from ethane through heptane with methan…
The reduction of elementary or skeletal oxidation kinetics to a subgroup of tractable reactions for inclusion in turbulent combustion codes has been the subject of numerous studies. The skeletal mechanism is obtained from the elementary mechanism by removing from it reactions that are considered neg…
A TECHNIQUE WAS DEVELOPED TO OBTAIN TIME- AND SPATIALLY-RESOLVED GAS SAMPLES FROM THE DEVELOPMENT VOLUME OF A RECIPROCATING ENGINE. The technique was used to investgate the distribution of fuel and products of combustion, with emphasis on the sources and formation mechanisms of gaseous hydrocarbons,…
The molecule of the title compound, C31H34N2O4, adopts an L-shaped configuration, in which the naphthalene units are approximately perpendicular, making a dihedral angle of 87.89 (3)°. Intramolecular H-bonds are formed between the OH substituents and the N atoms at each end of the…
The presented study focuses on the separation of aromatics from aliphatic hydrocarbons by liquid-phase extraction using ionic liquids. The aim of this study was to show the impact of incorrect description of liquid–liquid equilibria of the separated system on the extractor design parameters. Extract…
The existing phenomenological soot model, which unburned fuel is considered soot precursor, cannot predict the soot emission of alcohol blend fuel with high accuracy. Therefore, we proposed to introduce the coefficient Keff including the concept of Threshold Sooting Index (TSI) which quantitatively …
In this study, 34 volatile organic compounds (VOCs) were analyzed using an online VOCs instrument at 30-min intervals from November 16 to November 23, 2023, in Ulaanbaatar (UB), the capital of Mongolia for the first time. The average concentration of the 34 VOCs was 13.0 ± 11.1 ppb, with the top 10 …
Background: Numerous natural substances with various pharmacological properties can be discovered in medicinal plants. Pithecellobium dulce (Roxb.) Benth is a traditional medicinal plant, belonging to the family Leguminosae. The various parts of the P. dulce plant are traditionally used to treat a w…
This paper proposed a new empirical K-value equation is developed to calculate dew pressure for gas condensate reservoirs. This equation is applicable in the wide ranges of composition, temperature, and pressure by considering the effect of composition via two equations for normal boiling point and …
<p>With the increasing technological development, the problem of hydrocarbon pollution has become one of the urgent problems of our current era. Many techniques have been proposed and applied to address this phenomenon, including the use of polymer-based nanocomposites. This study involved the prepa…
This work evaluates the use of spent coffee grounds (SCG) for biodiesel production. The SCG were characterized for their moisture content (12.1 wt%), total carbon (TC) and total nitrogen (TN) (52.2 and 2.1 wt% respectively), cellulose and total lignin contents (33.6 wt% and 13.8 wt% respectively), c…
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Vaporization analysis of n-heptane in unstable combustor with traveling transverse oscillations using drop-evaporation theory
Attenuation of tangent-pressure oscillation in liquid-oxygen-heptane rocket engine combustion chamber using longitudinal fin
Injection techniques for fluorine, oxygen, and heptane in 200-pound thrust rocket engine
A droplet combustion experiment (DCE) was performed on the MSL-1 mission of the Space Shuttle Columbia. There were two flights of this mission - STS-83 in April of 1997 and STS-94 in July of 1997. The reflight occurred because a fuel-cell power problem onboard the shuttle forced an early termination…
Experimental results are presented on the burning and sooting behavior of large n-heptane droplets in air at atmospheric pressure under microgravity conditions. The experiments were performed at the Japanese Microgravity Center (JAMIC) 10 sec dropshaft in Hokkaido, Japan. Soot volume fraction, burni…
Liquid densities of the hydrocarbons 1-hexene, 2,4-dimethylhexane, 2,2,4-trimethylpentane, and <i>n</i>-heptane were measured over a wide range of temperatures (293.15 K to 393.15 K) and pressures (up to 120 MPa), substantially extending the state range covered by previously available literature dat…
Improving gasoline octane number while reducing aromatics is crucial for clean fuel production. Herein, a core-shell 2% Ni/ZSM-5-138@SiO<sub>2</sub>-1 bifunctional catalyst was constructed by coating ZSM-5 with an inert SiO<sub>2</sub> shell followed by Ni impregnation. The amorphous SiO<sub>2</sub>…
Bamboo-derived biochars obtained <i>via</i> fast and slow pyrolysis conditions were used as supports for the immobilization of <i>Candida antarctica</i> lipase B (CALB) through physical adsorption. The FP- and SP-based materials were then evaluated in esterification and hydrolysis reactions under bo…
The development of bio-based plasticizers is increasingly important due to regulatory restrictions on several phthalates, growing concerns over plasticizer migration and toxicity, and the demand for renewable materials. In this work, eleven novel furfural-derived bio-based plasticizers were synthesi…
Paper derives its mechanical integrity from a complex network of interactions between cellulose fibres, yet the relative importance of hydrogen bonding, hydrophobic interactions and electrostatic forces remains debated. Here, the wet tensile strength of paper sheets are investigated when exposed to …
The development of new analytical tools remains a powerful approach in analytical chemistry, and three-dimensional (3D) printing has gained increasing popularity as a manufacturing technique in recent years. The fabrication of experimental tools using 3D printers has attracted attention in many fiel…
Strained spiro heterocycles have gained popularity in medicinal chemistry due to their potential to act as conformationally rigid non-classical three-dimensional bioisosteres. Recently, 1-azaspiro[3.3]heptane has been validated as a piperidine bioisostere, although synthetic methods available for fu…
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