Rigid disks and spheres at high densities - Bounds on the partition function.
Upper and lower bounds on partition functions for finite systems of rigid disks and spheres for high density limit
FACE CENTERED CUBIC /FCC/ CRYSTAL↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A dynamical formalism for an arbitrary number of interconnected rigid bodies, with reference to the problem of satellite attitude control.
Dynamical formalism for arbitrary number of interconnected rigid bodies analyzed with reference to passive attitude stabilization of satellites
PASSIVE SATELLITE↗
Tunnel model for rigid disks near close packing.
Partition function for tunnel model of rigid disks evaluated in asymptotic limit of reduced volume, including close-packed value of closed systems area
DISK↗
The Stresses Produced by a Screw Dislocation Pileup at a Circular Inclusion of Finite Rigidity
Exact solution for stresses produced by screw dislocation pileup at circular inclusion of finite rigidity
STRESS ANALYSIS↗
Gravitational Equilibria of a Rigid Body Containing Symmetric Rotors
Gravitational equilibria of rigid body containing symmetric constant speed fixed axis rotor
ROTOR↗
Rigidization of a 1.52-meter diameter inflatable solar concentrator in vacuum with associated material studies and fabrication techniques Final report
Foam rigidizing for inflatable paraboloidal solar collector
FOAMED MATERIAL↗
Motion of a rigid-plastic circular cylindrical shell in a resisting medium
Motion analysis for rigid-plastic cylindrical shell clamped at both ends and subjected to internal impact load
IMPACT LOAD↗
Influence of the rigidity of transverse diaphragms on the temperature stresses in thin-walled systems /shells/
Influence of transverse diaphragm rigidity on temperature stresses in thin walled bars and shells of closed and open profile
STRUCTURAL RIGIDITY↗
On the rigidity operators of a stiffened plate at creep
Rigidity operators of reinforced plate composed of isotropic homogeneous layers
REINFORCED PLATE↗
Use of the method of dynamic rigidities for calculating the frequencies of natural vibrations of built-up shells
Frequencies of natural vibrations in built-up shells determined by dynamic rigidities method
RIGIDITY↗
Calculation of control gains with filters for rigid body motion of a space vehicle
Equations for calculating control gains with filters for rigid body motion of space vehicle
RIGID BODY↗
Gravitational equilibria of a rigid body containing symmetric rotors.
Existence and stability of equilibrium orientations of rigid body with gyrostat in nonuniform gravitational field
RIGID BODY↗
Theoretical determination of gravity effects on the rotational motion of a uniaxial rigid close earth satellite.
Canonical transformation to investigate rotational motion of uniaxial orbiting rigid body influenced by gravity gradient torque
COORDINATE SYSTEM↗
Coupled two-degree-of-freedom response of soft- mounted rigid body to random excitation.
Mode coupling effect on response of rigid body to random excitation analyzed, using two degree of freedom model
DYNAMIC RESPONSE↗
Orientation of a rigid torque-free body by use of star transits.
Time dependent orientation of body fixed coordinate system relative to stars for spinning rigid torque-free body
PRECESSION↗
The R-38 Catastrophe and the Mechanics of Rigid Airship Construction
An airship frame may be regarded as a rigid girder subjected to a number of forces which, according to their nature, may be classified as follows: weight or loads (force of gravity); lifting forces (aero-static); accelerations (dynamic). These forces must be in equilibrium in the three most important cases during flight: 1) when the airship is floating (aerostatic problem); 2) when flying without acceleration (aerodynamic problem). 3) When under the influence of any accelerating force (dynamic problem). This report will briefly discuss each of these cases in regard to the R-38 airship accident.
AIRSHIPS - R-38 - ACCIDENTS (BRIT )↗
Atmospheric Entry Studies for Saturn Missions: 45 Sphere-Cone Rigid Aeroshells and Ballistic Entries
Exploration of Saturn atmospheric entry trajectory space using a 45 sphere-cone rigid aeroshell.
Atmospheric Entries↗
Rigid Supramolecular Aramid Nanotubes as Catalyst Supports
Solution‐phase heterogeneous catalysts benefit from nanoscale dimensions, which maximize specific surface area and enhance catalytic activity. However, the ease of recovering such nanocatalysts depends on the design of the support materials, which are often particle‐like. Rigid 1D nanomaterials are proposed as supports that can enhance separability while offering high volumetric specific surface area for greater catalyst loading and activity. Here, aramid amphiphiles (AAs) are designed to spontaneously self‐assemble in water into high‐aspect‐ratio supramolecular nanotubes with tunable surface chemistry. These AA nanotubes exhibit high persistence lengths (P = 750 ± 340 µm) and mechanical stiffnesses (3 N/m). Incorporating surface thiol groups enables immobilization of catalytic gold nanoparticles. The resulting AA nanotube‐gold nanoparticle complexes exhibit high catalytic activity, efficient recoverability via simple microfiltration, and sustained reusability over ten reaction cycles. This study demonstrates the utility of molecular self‐assembled 1D nanomaterials as versatile scaffolds for the reuse and recovery of nanoscale catalysts.
1D nanomaterials↗