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Advanced combustion technologies such as homogeneous charge compression ignition (HCCI) engines have a narrow stable operating region defined by complex control strategies such as exhaust gas recirculation (EGR) and variable valve timing…

Neural and Evolutionary Computing · Computer Science 2013-06-25 Vijay Manikandan Janakiraman , XuanLong Nguyen , Jeff Sterniak , Dennis Assanis

The oxygen self-diffusion coefficient in UO${_2}$ has been recently studied [Cooper et al. Solid State Ionics 282 (2015) 26-30] over a range of pressures (0-10GPa) and temperatures (300-1900K) by combining molecular dynamics calculations…

Materials Science · Physics 2016-01-25 N. V. Sarlis , E. S. Skordas

The ion-molecule reactions $\text{D}_2^++\text{NH}_3$ and $\text{D}_2^++\text{ND}_3$ are studied at low collision energies ($E_{\text{coll}}$ from zero to $\sim k_\textrm{B}\cdot 50\,\text{K}$), with the $\text{D}_2^+$ ions in the ground…

Chemical Physics · Physics 2024-03-05 Raphaël Hahn , David Schlander , Valentina Zhelyazkova , Frédéric Merkt

The initial density of dark matter (DM) particles, otherwise secluded from the standard model (SM), may be generated at reheating, with an initial temperature ratio for internal thermalizations, $\xi_i=T_{\rm DM,i}/T_{\rm SM,i}$. This…

High Energy Physics - Phenomenology · Physics 2024-05-02 Deep Ghosh , Sourav Gope , Satyanarayan Mukhopadhyay

We analyze methanol excitation in the absence of external radiation and consider LTE methods for probing interstellar gas. We show that rotation diagrams correctly estimate the gas kinetic temperature only if they are built from lines with…

Astrophysics of Galaxies · Physics 2017-10-23 S. V. Kalenskii , S. Kurtz

A completely rigorous first-principles calculation of the charged particle stopping power has recently been performed by Brown, Preston, and Singleton (BPS). This calculation is exact to leading and next-to-leading order in the plasma…

Plasma Physics · Physics 2008-02-21 Robert L. Singleton

Hydrogen combustion systems operated under fuel-lean conditions offer great potential for low emissions. However, these operating conditions are also susceptible to intrinsic thermodiffusive combustion instabilities. Even though technical…

Fluid Dynamics · Physics 2025-07-14 Max Schneider , Hendrik Nicolai , Vinzenz Schuh , Matthias Steinhausen , Christian Hasse

A novel capsule target design to improve the hot-spot pressure in the high-adiabat implosion for inertial confinement fusion is proposed, where a layer of comparatively high-density material is used as a pusher between the fuel and the…

Plasma Physics · Physics 2017-02-21 Dongguo Kang , Shaoping Zhu , Wenbing Pei , Shiyang Zou , Wudi Zheng , Jianfa Gu , Zhensheng Dai

Methanol-water liquid mixtures have been investigated by high-energy synchrotron X-ray and neutron diffraction at low temperatures. We are thus able to report the first complete sets of both X-ray and neutron weighted total scattering…

The effects of initial pressure and temperature on the laminar burning speed of n-hexane-air mixtures were investigated experimentally and numerically. The spherically expanding flame technique with a nonlinear extrapolation procedure was…

Comparing with ITER, the experimental fusion machine under constraction, the next step test fusion power plant, DEMO will be characterized by very long pulse/steady-state operation and much higher plasma volume and fusion power. The…

Instrumentation and Detectors · Physics 2015-10-29 V. G. Kiptily

A recently proposed technique for improving ignition timing is investigated for real-gas effects. A correction to the model describing the cumulative energy effect in the presence of the shock-discontinuity interaction was done by…

Fluid Dynamics · Physics 2020-11-03 A. Markhotok

By means of extensive equilibrium molecular dynamics simulations we have investigated, the behavior of the interfacial tension $\gamma$ of two immiscible symmetrical Lennard-Jones fluids. This quantity is studied as function of reduced…

Statistical Mechanics · Physics 2016-08-15 Enrique Diaz-Herrera , José Alejandre , Guillermo Ramírez-Santiago , F. Forstmann

Imposing a magnetic field on inertial confinement fusion (ICF) implosions magnetizes the electrons in the compressed fuel; this suppresses thermal losses which increases temperature and fusion yield. Indirect-drive experiments at the…

Plasma Physics · Physics 2025-08-15 R. C. Spiers , A. Bose , C. A. Frank , B. Lahmann , J. D. Moody , H. Sio , D. J. Strozzi

The mechanisms of direct detonation initiation (DDI) in methane/air mixtures containing coal particles are investigated through simulations conducted using the Eulerian-Lagrangian method in a two-dimensional configuration. Methane-air…

Chemical Physics · Physics 2025-03-05 Shengnan Li , Shangpeng Li , Shumeng Xie , Yong Xu , Ke Gao , Huangwei Zhang

Ignition of iron particles in an oxidizing environment marks the onset of a self-sustained combustion. The objective of the current study is to quantitatively examine the ignition characteristics of fine iron particles governed by the…

Fluid Dynamics · Physics 2022-02-22 Xiaocheng Mi , Aki Fujinawa , Jeffrey M. Bergthorson

We report on a systematic characterization of microbulk Micromegas readouts in high-pressure Ar+1%iC4H10 and Ne+2%iC4H10 mixtures. Experimental data on gain, electron transmission and energy resolution are presented for a wide range of…

Instrumentation and Detectors · Physics 2022-08-03 F. J. Iguaz , T. Dafni , C. Canellas , J. F. Castel , S. Cebrián , J. G. Garza , I. G. Irastorza , G. Luzón , H. Mirallas , E. Ruiz Chóliz

The mechanism of finger flame acceleration at the early stage of burning in tubes was studied experimentally by Clanet and Searby [Combust. Flame 105: 225 (1996)] for slow propane-air flames, and elucidated analytically and computationally…

We present the "First Light Advanced Ignition Model" (FLAIM), a reduced model for the implosion, adiabatic compression, volume ignition and thermonuclear burn of a spherical DT fuel capsule utilising a high-Z metal pusher. FLAIM is…