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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…
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…
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 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…
The results reported her directly supports the U.S. Army's research and development program in alternative fuels. Liquid fuels which are homogeneous solutions of hydrocarbon and alcohol fuels are considered here. Since combustion of diesel fuel resembles that in a diffusion flame, and because turbul…
The objective of this research was to quantify the effects of fuel fire and the follow-on fire extinguishing actions on wireless shipboard communications in the 2.4 GHz ISM band. Directional and non-directional antennas with horizontal and vertical polarization, and a PC-controlled scalar network an…
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…
The combustion of the fuel in-cylinder of the engine can be affected by the fuel/air mixture and fuel/air equivalence ratio. The fuel/air mixture can generate the swirls when the fuel/air will be mixed in-cylinder. The formation of turbulence can effectively promote the combustion of the fuel, there…
In the present state of things, there are three great problems to be solved, relating respectively to the financial, technical, and commercial aspects of the question of commercial aviation.
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…
The formation of M<sup>+∙</sup>, [M - 2H]<sup>+∙</sup>, and [M - <i>n</i>H]<sup>+</sup> (<i>n</i> = 1, 3, 5) ions has been reported by using atmospheric pressure corona discharge (APCD) of <i>n</i>-heptane. The M<sup>+∙</sup> and [M - H]<sup>+</sup> ions can be produced by high-electric field tunnel…
N-Bridged bicyclic scaffolds bearing 3-azabicyclo[3.2.0]heptane and 3-azabicyclo[3.1.1]heptane cores have emerged as privileged bioisosteres of piperidine and meta-substituted pyridine, offering enhanced conformational rigidity and improved pharmacokinetic profiles. However, existing synthetic appro…
<i>E</i>-Selective bromination for diphenylacetylene was established by using the combination of NBS and FeBr<sub>3</sub> in CH<sub>2</sub>Cl<sub>2</sub>. In addition, easy purification and separation from the crude product were found. When the crude product was treated with heptane, the <i>E</i> is…
This study reports an experimental investigation of soot formation in laminar diffusion flames of <i>n</i>-heptane doped with organometallic additives, including ferrocene, ferrocene methanol, and ferrocene carboxaldehyde, at concentrations of 100 and 500 ppm. Measurements of flame temperature, flam…
[This corrects the article DOI: 10.1021/acsomega.3c02448.].
Ongoing research on adsorbent deactivation in drying processes has unveiled crucial insights into the loss of performance with prolonged use. Our study builds on previous work by examining the effects of high temperatures, hydrocarbon exposure, and cycle duration on chabazite adsorbents with a Si/Al…
In the present work, we have utilized "alchemical" approaches to study the thermodynamic properties of four alkane molecules: pentane, hexane, heptane, and octane in water. We have used thermodynamic integration (TI) and free energy perturbation (FEP) based methods: TI, TI-cubic, Bennett acceptance …
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