Results 91 to 100 of about 15,241 (253)
First evaluation of the main parameters in the dynamics of the Small Expendable Deployer System (SEDS) for a tethered satellite [PDF]
, 1990 The dynamics of the motion of the Small Expendable Deployer System (SEDS) is studied by using a simplified model in which no external forces (except the gravity gradient field) are applied on the tethered body and the tether is assumed massless.
Deluca, Luigi
core +1 more source
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
Post-disaster 4G/5G Network Rehabilitation using Drones: Solving Battery and Backhaul Issues [PDF]
, 2018 Drone-based communications is a novel and attractive area of research in cellular networks. It provides several degrees of freedom in time (available on demand), space (mobile) and it can be used for multiple purposes (self-healing, offloading, coverage ...
Kamal, Ahmed +2 more
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Model‐Based Systems Engineering in Space Applications: A Comprehensive Literature Review
Systems Engineering, EarlyView.ABSTRACT The growing complexity of space engineering is driving the demand to embrace the adoption of Model‐Based Systems Engineering (MBSE). Although the MBSE is well‐practiced in the space industry, the level of effort and need required to obtain the benefits of MBSE vastly differ across enterprises; this disparity presents a significant challenge to
Rehobot Bekele Buruso +4 more
wiley +1 more source
Theoretical investigation of EM wave generation and radiation in the ULF, ELF, and VLF bands by the electrodynamic orbiting tether [PDF]
The problem of electromagnetic wave generation by an electrodynamic tethered satellite system is important both for the ordinary operation of such systems and for their possible application as orbiting transmitters.
Estes, Robert D., Grossi, Mario D.
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The Chemical Record, EarlyView.This account highlights molecular design strategies for fluorinated tolane derivatives that integrate mesomorphic order with photoluminescence. The extent to which the fluorination pattern and flexible chain architecture govern the structure–property relationships to realize highly emissive and thermally tunable liquid–crystalline systems is elucidated.
Shigeyuki Yamada +2 more
wiley +1 more source
Investigation of plasma contactors for use with orbiting wires [PDF]
The proposed Shuttle-based short tether experiments with hollow cathodes have the potential for providing important data that will not be obtained in long tether experiments.
Estes, Robert D. +2 more
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A Method for Establishing a Station-Keeping, Stratospheric Platform for Astronomical Research
, 2015 During certain times of the year at middle and low latitudes, winds in the upper stratosphere move in nearly the opposite direction than the wind in the lower stratosphere. Here we present a method for maintaining a high-altitude balloon platform in near
Brown, Yorke, Fesen, Robert
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Metal‐Free Electrophilic Borylative Cyclizations of Alkynes
The Chemical Record, EarlyView.Metal‐free borylative cyclizations based on electrophilic alkyne activation by boron Lewis acids provide efficient access to borylated hetero‐ and carbocycles. Early studies using B(C6F5)3 displayed limited scope and application, whereas recent ClBcat‐ and BCl3‐based methods enable mild CB and CC/CX bond formation for the synthesis of cycles ...
Jaime Mateos‐Gil +3 more
wiley +1 more source
The Chemical Record, EarlyView.Nickel foam—one material, two faces, and several versatile roles depending on electrolytic conditions. For more than 50 years, nickel foam electrodes have served in electrosynthesis as powerful and readily available electrode materials. Due to their inexpensive nature and easy handling, they have been widely employed.
Rok Narobe +2 more
wiley +1 more source