Results 101 to 110 of about 9,609 (252)

Heterogeneous propellant internal ballistics: criticism and regeneration [PDF]

Progress in Propulsion Physics, 2011
Although heterogeneous propellant and its innately nondeterministic, chemically discrete morphology dominates applications, ballisticcharacterization deterministic time-mean burning rate and acoustic admittance measures' absence of explicit, nondeterministic information requires homogeneous propellant with a smooth, uniformly regressing burning surface:
openaire   +1 more source

Complementarity in alliances: How strategic compatibility and hierarchy promote efficient cooperation in international security

American Journal of Political Science, EarlyView.
Abstract How can defense alliances reap the efficiency gains of working together when coordination and opportunism costs are high? Although specializing as part of a collective comes with economic and functional benefits, states must bargain over the distribution of those gains and ensure the costs of collective action are minimized.
J. Andrés Gannon
wiley   +1 more source

Static recrystallization of shocked calcite in Ries impact breccias

Meteoritics &Planetary Science, EarlyView.
Abstract Calcite is prone to chemical and microstructural modifications, especially after having been strained at high stresses and strain rates, as during hypervelocity impact events. These modifications include precipitation from pore fluid as well as replacement of strained volumes by recrystallization. In calcite aggregates of a metagranite breccia
Claudia A. Trepmann, Fabian Dellefant, Lina Seybold, Wolfgang W. Schmahl, Elena Sturm, Daniel Weidendorfer, Sandro Jahn, Iuliia V. Sleptsova, Stuart A. Gilder   +8 more
wiley   +1 more source

Hybrid propulsion technology program: Phase 1. Volume 3: Thiokol Corporation Space Operations [PDF]

Three candidate hybrid propulsion (HP) concepts were identified, optimized, evaluated, and refined through an iterative process that continually forced improvement to the systems with respect to safety, reliability, cost, and performance criteria. A full
Schuler, A. L., Wiley, D. R.
core   +1 more source

Diffuse emission in the presence of inhomogeneous spin-orbit interaction for the purpose of spin filtration

, 2005
A lateral interface connecting two regions with different strengths of the Bychkov-Rashba spin-orbit interaction can be used as a spin polarizer of electrons in two dimensional semiconductor heterostructures. [Khodas \emph{et al.}, Phys. Rev.
A. M. Finkel’stein, A. Shekhter, D. Pines, E. I. Rashba, E. I. Rashba, E. M. Lifshitz, I. B. Levinson, I. B. Levinson, I. B. Levinson, I. B. Levinson, L. D. Landau, M. I. Dyakonov, M. I. Dyakonov, M. Khodas, P. M. Morse, R. Landauer   +15 more
core   +1 more source

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Computation of three-dimensional nozzle-exhaust flow fields with the GIM code [PDF]

A methodology is introduced for constructing numerical analogs of the partial differential equations of continuum mechanics. A general formulation is provided which permits classical finite element and many of the finite difference methods to be derived ...
Anderson, P. G., Spradley, L. W.
core   +1 more source

How to make people do things with words

Noûs, EarlyView.
Abstract Sometimes we do what other people tell us to. A natural thought is that the motivation to act on an instruction comes about rationally as the result of interpreting an imperative and deciding to act on it; that is, by updating on information that gets mediated through belief‐desire reasoning.
Henry Schiller, Shaun Nichols
wiley   +1 more source

Development of Casbar: a Two-phase Flow Code for the Interior Ballistics Problem [PDF]

, 2007
Accurate modelling of gun interior ballistic processes aids in the design and analysis of guns and their propelling charges. Presently, the most accurate modelling of the interior ballistics problem is provided by two-phase, multidimensional ...
Gollan, R. J., Jacobs, P. A., Johnston, I. A., O’Flaherty, B. T.   +3 more
core   +1 more source

Measuring of plasma’s velocity in electrodynamic railgun using high-frequency method

MATEC Web of Conferences, 2018
A method is proposed for measuring the velocity of a moving plasma in an electrodynamic railgun in the part of internal ballistics. The achieved result is to provide a measurement of instantaneous velocity and an increase of the safety level for ...
Kirievskiy Vladimir V., Kirievskiy Evgeny V.   +1 more
doaj   +1 more source