Results 81 to 90 of about 9,936 (212)
Precision slew/settle technologies for flexible spacecraft [PDF]
Many spacecraft missions in the next decade will require both a high degree of agility and precision pointing. Agility includes both rotational maneuvering for retargeting and translational motion for orbit adjustment and threat avoidance.
Manning, R. A., Spector, Victor A.
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Evaluation of prestress losses in concrete beams using destructive and non‐destructive methods
Structural Concrete, EarlyView.Abstract Over the past few decades, prestressing techniques have become essential in the construction of key structures, infrastructure, and bridges. The serviceability and safety of prestressed concrete (PC) elements are closely tied to the effectiveness of the prestressing process.
A. N. Consiglio, G. Muciaccia, G. Rosati
wiley +1 more source
Brake lock mechanism for the two axis pointing system [PDF]
Six months prior to shipment of the Broadband X-ray Telescope to the Kennedy Space Center for flight aboard the Space Shuttle Columbia, a major system failure occurred.
Clark, Mike, Mignosa, Larry, Posey, Alan
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A Hydrogen‐Bonded Organic Biradical in the Gas Phase
Journal of Physical Organic Chemistry, Volume 39, Issue 7, July 2026.Hydrogen‐bonded dimers of the TEMPOL radical are investigated by vibrational spectroscopy in the gas phase and shown to occur in at least two conformations, a stretched one with a strong hydrogen bond to the radical centre and a bent one with more pronounced London dispersion interactions. ABSTRACT Persistent organic radicals from the TEMPO family such
Dana Donnerstag +2 more
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New Experimental Limits on Macroscopic Forces Below 100 Microns
, 2003 Results of an experimental search for new macroscopic forces with Yukawa range between 5 and 500 microns are presented. The experiment uses 1 kHz mechanical oscillators as test masses with a stiff conducting shield between them to suppress backgrounds ...
A Kehagias +28 more
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Geometry Analysis of Two Photon Polymerized Microneedles—An Experimental and Simulated Approach
Journal of Applied Polymer Science, Volume 143, Issue 22, June 10, 2026.This research investigates the mechanical stability of hollow, two‐photon‐polymerized microneedles for drug delivery. In an experimental setup, a steel stamp gradually compresses 1000 μm‐tall microneedles while recording their force–deformation response.
Cordelia F. Wittemann +4 more
wiley +1 more source
, 2023 Magnetorheological elastomers (MREs) are materials that exhibit a change in their mechanical properties, such as stiffness and damping, in response to an applied magnetic field. In general, MREs consist of an elastomeric matrix and homogeneously dispersed magnetic particles, which allow for adjustable viscoelastic properties when a magnetic field is ...
openaire +1 more source
Field verification of lateral-torsional coupling effects on rotor instabilities in centrifugal compressors [PDF]
Lateral and torsional vibration data obtained on a centrifugal compressor train which had shaft instabilities and gear failures is examined. The field data verifies that the stability of centrifugal compressors can be adversely affected by coincidence of
Szenasi, F. R., Wachel, J. C.
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Zeitschrift für anorganische und allgemeine Chemie, Volume 652, Issue 7, 6 May 2026.Different methods to prepare 1,7‐disubstituted tetradecaphenylheptasilanes are explored. The triflated heptasilane TfO‐(SiPh2)7‐OTf reacts with alkali metal halides to produce the 1,7‐dihalogenides X‐(SiPh2)7‐X (X = F, Cl, Br, I). The 1,7‐dihydrogen derivative H‐(SiPh2)7‐H is obtained with LiAlH4 or (i‐Bu)2AlH as reducing agents.
Mike Friebel, Böhme Uwe, Edwin Kroke
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MXene‐Enabled Wearable Biosensors: A Design Framework for Autonomous Biosensing
ChemElectroChem, Volume 13, Issue 9, 5 May 2026.Bridging nanoscale innovation with MXene to real‐time, patient‐centered health systems. MXenes, a rapidly expanding family of two‐dimensional transition metal carbides and nitrides, have emerged as leading materials for wearable bioelectronics due to their metallic conductivity, termination‐rich surfaces, mechanical compliance, and tunable interlayer ...
Jegan Rajendran, Gymama Slaughter
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