Results 41 to 50 of about 24,284 (223)

Interplanetary frontiers: terraforming from an invasion science perspective

Oikos, EarlyView.
The pursuit of a multi‐planetary existence represents one of humanity's greatest frontiers. If applied justly, it offers an opportunity to extend its civilization's lifespan amid escalating sustainability crises on Earth. One approach increasingly gaining traction is terraforming, a hitherto theoretical ecological and evolutionary experiment revolving ...
Teun Everts, Ronaldo Sousa, Phillip J. Haubrock   +2 more
wiley   +1 more source

Mixer-detector and multiplier diodes for microwave receiver mixers

Технологія та конструювання в електронній апаратурі, 2003
Original designs of gallium arsenide Schottky barrier diodes are described, which are successfully used in frequency converters of the centimeter and millimeter wavelength ranges.
S. V. Bobzhenko, V. I. Mai, V. A. Novitsky, V. V. Tkachenko, А. V. Tkachenko, M. I. Ugrin   +5 more
doaj  

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

A multi-instrument view of tail reconnection at Saturn

, 2008
Three instances of tail reconnection events at Saturn involving the ejection of plasmoids downtail have been reported by Jackman et al. (2007) using data from Cassini’s magnetometer (MAG).
Jones, G.H, Jones, G., Arridge, C., Krupp, N., Arridge, C.S., Bunce, E.J., Jackman, C., Jones, G. H., Jackman, C. M., Jackman, C.M., Arridge, C. S., Russell, C. T., Mitchell, D.G., Mitchell, D., McAndrews, H.J, Russell, C., Russell, C.T., Coates, A., Coates, A.J., McAndrews, H. J., McAndrews, H., Mitchell, D. G., Coates, A. J., Dougherty, M. K., Dougherty, M., Dougherty, M.K., Bunce, E., Bunce, E. J., Achilleos, N.   +28 more
core   +1 more source

High-power microwave transistors based on wide-band semiconductors

Технологія та конструювання в електронній апаратурі, 2003
A review of recent published results on the development of high-power microwave transistors based on AlGaN/GaN heterostructures is presented. The design and manufacturing technology of these transistors are discussed, along with studies of substrate ...
V. I. Bosyi, A. V. Ivashchuk, V. N. Kovalchuk, E. M. Semashko   +3 more
doaj  

Impact of the turbulence modeling approach on the accuracy of the fan noise level prediction

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018
The fan is the dominant source of noise for modern high bypass ratio aircraft engines. The article presents the results of investigating the influence of the approach to modeling the turbulence in modeling fan stage noise generation on the results of ...
K. R. Pyatunin, N. V. Arkharova
doaj   +1 more source

Vine Tendril‐Inspired Cold‐Programmable Shape‐Memory Polymer Composites Using Sugar Beet Pulp

Small, EarlyView.
Vine tendrils inspire a bio‐derived, cold‐programmable shape‐memory polymer composite (SMPC). Magnetically guided sugar beet pulp creates mesoscale heterogeneity within a glassy matrix, producing built‐in mechanical asymmetry for rapid, solvent‐free programming by simple stretching.
Wei Huang, Vikramjeet Singh, Yu Wang, Junhao Chen, Mingjing Zhang, Gary J. Lye, Helen C. Hailes, Luna Jiang, Eral Bele, Manish K. Tiwari   +9 more
wiley   +1 more source

Monolithic balanced mixer for the 80–100 GHz frequency range

Технологія та конструювання в електронній апаратурі, 2003
A monolithic balanced mixer operating in the 80–100 GHz frequency range has been developed and studied. The device features a high level of integration and resistance to mechanical and climatic factors.
E. N Aseeva, V. I. Mai, A. V. Mai, V. I. Superson, V. V. Tkachenko   +4 more
doaj  

Embedded Interactions and Selective Disclosure: Network Effects on Conversations aboard Skylab

Symbolic Interaction, EarlyView.
How do absent others influence our interactions? We argue in this paper that interactions are embedded within networks formed by chains of specific relationships between known third parties. The anticipation of future interactions with external others conditions our interpretation of the current situation and affects our behavior in the interaction. We
Michael Schultz, Leslie DeChurch, Noshir Contractor   +2 more
wiley   +1 more source

Monolithic frequency converters 5 and 3 bands

Технологія та конструювання в електронній апаратурі, 2006
This paper presents the description and research results of monolithic frequency converters for the 5- and 3-millimeter ranges. The design and technological solutions are aimed at using these converters as functionally complete modules in transceiver ...
V. V. Tkachenko, A. V. Mai, V. I. Mai, Y. O. Udod, M. I. Ugrin   +4 more
doaj