Results 61 to 70 of about 5,154,085 (219)

Direct Measurement of Explosive Impulse From Contact to the Ultra‐Near Field

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT Measurement of impulse from explosive charges in contact and ultra‐near‐field regimes remains poorly characterised due to the short duration of loading, high strain rates, and the difficulty of obtaining direct momentum‐based measurements.
R. Alford, R. Hazael, R. Critchley, L. Humphreys   +3 more
wiley   +1 more source

Effect of Resonant Mixer Granulation Parameters on Prill Properties

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT Resonant mixing is a promising processing approach to manage mixing of materials with high solids content and has shown strong performance for mixing powders and pastes in energetic materials. This has led to the exploration of the approach for granulation of primary particles into millimeter‐sized agglomerates, including for generating ...
Hannah Cook, S. Emad Renfroe, Jessica Keith, Eleanor E. Radlinski, Albin Darby, Blair Brettmann   +5 more
wiley   +1 more source

Little League Baseball sponsored by the Lubbock G.I. Forum. Name of Club: G.I. Forum Rockets (photograph)

, 2017
Little League Baseball sponsored by the Lubbock G.I. Forum. Name of Club: G.I.

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Designing Flight Experiments for Hypersonic Flow Physics [PDF]

, 2005
A major problem of concen for the success of physical-modelling resides in the availability of experimental data for model validation, particularly in the hot hypersonic regime.
Gülhan, A., Turner, J., Weihs, H., Eggers, Th., Longo, J.M.A.   +4 more
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Sliding Mode Control in Aerospace Applications: A Survey

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley   +1 more source

MAPHEUS-1: Vehicle, Subsystem Design, Flight Performance And Experiments [PDF]

, 2009
There are numerous materials science experiments in microgravity, which can be realized on sounding rockets, e.g. the gelation of aerogels, directional solidification of alloys and diffusion measurements in metallic melts.
Drescher, Jörg, Hassenpflug, Frank, Ratke, Lorenz, Hörschgen, Marcus, Neumann, Christian, Griesche, Axel, Stamminger, Andreas, Hoepfner, Sandra, Meyer, Andreas, Blochberger, Guido, Ettl, Josef, Willnecker, Rainer, Plescher, Engelbert   +12 more
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National Policy Coherence Counts for Reducing Inequality in Global Climate and Development Agendas

Sustainable Development, EarlyView.
ABSTRACT International institutions promote policy coherence as crucial to the effective and fair implementation of global sustainability agendas, though the evidence for its benefits is slim. We present here the first systematic cross‐country dataset on the consequences of national government efforts to promote policy coherence for vulnerable groups ...
Katherine Browne, Adis Dzebo, Zoha Shawoo, Mario Cardenas, Pierrick Chalaye, Alexia Faus Onbargi, Cassilde Muhoza, Patricia Nicdao, Nokwethaba Makhanya, Navam Niles, Priyatma Singh   +10 more
wiley   +1 more source

Strategy for One‐Step Optimization of Metal Oxide Passivating Contact Materials for Si Heterojunction Solar Cells through Growth Angle Variation

Small, EarlyView.
A one‐step oblique angle reactive sputtering approach enables simultaneous tuning of bulk and interfacial stoichiometry in a metal oxide/ silicon heterojunction. In case of vanadium oxides, growth angle variation controls the formation of stoichiometric SiO2, ternary SiOx(V) interlayer, and phase purity of vanadium oxide, considerably simplifying the ...
Aparajita Mandal, Alexis Franquet, Hans Hofsäss, Tapobrata Som   +3 more
wiley   +1 more source

Defining Lines of Defense Against Change Propagation Using Cause‐Consequence Analysis

Systems Engineering, EarlyView.
ABSTRACT Complex engineered systems are the core of modern society. So that engineered systems and infrastructure can be sustainable and offer value over the course of their lifespan, there is a growing need for such systems to be changeable. Yet, establishing and operationalizing changeability can be challenging due to the potential for change ...
Lindsey Jacobson, Scott Ferguson
wiley   +1 more source

Quantifying and Tracking Flexibility of System Elements to Support (Re)Design Decision‐Making

Systems Engineering, EarlyView.
ABSTRACT Evolving objectives and requirements, risk management processes, and external disruptions frequently drive change in engineered systems. Due to these pressures, system architects must anticipate and manage change throughout a system's lifecycle. Yet, managing change is challenging due to the risk of change propagation.
Lindsey Jacobson, Scott Ferguson
wiley   +1 more source