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…) 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…
Density and viscosity measurements have been performed for the systems 1-iodonaphthalene + heptane, or + decane, or + dodecane, or + tetradecane over the temperature range (288.15-308.15) K and atmospheric pressure. At this end, a densitometer Anton-Paar DMA 602 and a Ubbelohde viscosimeter were use…
…of heptane mixtures reveal the existence of structural changes in longer n-alkanoates, which lead to stronger interactions between them. The observed decrease of $H_{\text{m}}^{\text{E}}$ for systems with a given n-alkane seems to be more related to the steric hindrance of the COO group than to int…
…mechanisms of ODW formation. At lower momentum ratios, the oblique shock wave (OSW) induced by the jet is insufficient to directly initiate detonation. Instead, the atomized n-heptane jet increases the local fuel mass fraction, promoting low- and intermediate-temperature chemical reactions, which e…
This is a joint research program, pursued by investigators at the University of Tokyo, UCSD, and NASA Lewis Research Center. The focus is on high-pressure combustion of miscible binary fuel droplets. It involves construction of an experimental apparatus in Tokyo, mating of the apparatus to a NASA-Le…
The overall technical objective of the program was to develop an additive for JP-8, JP-5, and diesel fuels that will reduce both the mass Emissions Index (grams of PM2.5 emissions/kilogram of fuel) and the number density Emissions Index (particle number density of PM2.5 emissions/kilogram of fuel) i…
Fires in naval vessels may lead to a loss of capability, function, life and in extreme situations, the loss of the vessel. Machinery space fires are a particular concern because of the availability of fuel and ignition sources. Suppressant systems employed in the machinery spaces of RAN vessels must…
Work was continued on the study of Telagen S prepolymers for conventional and advanced propellant systems. The factors affecting low temperature behavior of conventional systems and a replacement for CTI received most attention this quarter. Saturation of Telagen prepolymers definitely causes poor l…
The standardized calibrating fluid project was initiated for the purpose of investigating available calibrating fluids and standardizing on one or more of these fluids for the calibration of all militay aircraft fuel metering components. After a lengthy series of fluid investigations and conferences…
Project objective was to develop and apply experimental and computational methodologies that can lead to design of improved supercritical fuel/catalyst/heat exchanger systems for cooling hypersonic vehicles. Advances in catalytic studies include: (1) Developed and applied modeling and software tools…
This study was motivated by a cargo tank explosion incident involving No. 6 fuel oil at a temperature well below its flash point. The overall objective of the study has been to evaluate the general fire and explosion hazards of high flash point liquid cargo, i.e., Grade E cargo. A review of Coast Gu…
Sanitized Copy Approved for Release 2011/08/31: CIA-RDP80-00809A000600330143-6 CLASSIFICATION SECRETVEq El CENTRAL INTELLIGENCE AGENCY REPORT INFORMATION FROM FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO. COUNTRY USSR SUBJECT Scientific - Chemistry, HOW PUBLISHED Periodicals WHERE PUBLISHED USSR DATE…
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 …
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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34-35 ; Vol. 19, pt. 1
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…
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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