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Dec 3, 2021
12/21
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International Conference on Micromechanics of Granular Media (4th : 2001 : Sendai, Japan)
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xiii, 635 pages : 26 cm
Topics: Granular materials -- Congresses, Powders -- Congresses, Granular materials, Powders
http://uf.catalog.fcla.edu/uf.jsp?st=UF030045891&ix=pm&I=0&V=D&pm=1
Topics: Fracture mechanics--Computer programs, Granular materials.
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xi, 281 p. : 24 cm
Topics: Granular materials -- Mechanical properties -- Congresses, Granular materials -- Thermomechanical...
Folkscanomy: General Academic Papers
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Jan 12, 2021
01/21
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Bakhronov Koshim Shayimovich | Khudoiberdieva Nazora Sharofovna | Yunusova Sitora Tolib qizi
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The results of experimental studies on the study of the expansion of the fluidized bed are presented. It is noted that the general picture of the expansion of the fluidized bed of polydisperse granular materials differs from monodisperse systems, and at the same time the porosity value of the pseudo-fluidized bed corresponds to the results of calculations according to the equations available in the literature Bakhronov Koshim Shayimovich, Khudoiberdieva Nazora Sharofovna and Yunusova Sitora...
Topics: fluidized bed, polydisperse granular materials, porosity, equtions
1 v. (various pagings) : 28 cm
Topics: Shear strength of soils -- Testing, Granular materials -- Testing
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May 13, 2022
05/22
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UK-China Particle Technology Forum (3rd : 2011 : Birmingham, England)
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1 online resource (viii, 296 pages) :
Topics: Particles -- Congresses, Granular materials -- Congresses, TECHNOLOGY & ENGINEERING --...
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Jan 5, 2022
01/22
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Katti, R. K. (Ramanath Keshavarao)
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xii, 467 pages : 28 cm
Topics: Soil mechanics, Granular materials, Sols, Mécanique des, Milieux granulaires
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Jul 21, 2010
07/10
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Stephens, J. R.; Strong, I. B.; Kunkle, T. D
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Astronomical observations which reflect the optical and dynamical properties of interstellar and interplanetary grains are the primary means of identifying the shape, size, and the chemistry of extraterrestrial grain materials. Except for recent samplings of extraterrestrial particles in near-Earth orbit and in the stratosphere observations were the only method of deducing the properties of extraterrestrial particles. In order to elucidate the detailed characteristics of observed dust, the...
Topics: ALUMINUM, CALCIUM, INTERSTELLAR EXTINCTION, INTERSTELLAR GAS, TITANIUM, CONDENSING, GRANULAR...
This project, with Antoinette Tordesillas of U of Melbourne, investigated models for the upper soil surface and its response to applied loads. We have examined key aspects above, experimentally and with computer simulations. We developed new micromechanically-based continuum models with predictive capabilities for multiscale phenomena in the soil/granular liquid-solid regime, based on the experiments and simulations. The Duke work involved detailed experiments that provided detailed information...
Topics: DTIC Archive, DUKE UNIV DURHAM NC, *GRANULAR MATERIALS, JAMMING, NETWORKS, SOIL MECHANICS
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May 26, 2011
05/11
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Wilbur, Matthew L
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At the Langley Research Center an active mount rotorcraft testbed is being developed for use in the Langley Transonic Dynamics Tunnel. This testbed, the second generation version of the Aeroelastic Rotor Experimental System (ARES-II), can impose rotor hub motions and measure the response so that rotor-body coupling phenomena may be investigated. An analytical method for coupling an aeroelastically scaled model rotor system to the ARES-II is developed in the current study. Models of the testbed...
Topics: CONFERENCES, PARTICLE DIFFUSION, FLUES, GRANULAR MATERIALS, HYDRODYNAMICS, SEDIMENTS, COMPUTERIZED...
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Jul 11, 2010
07/10
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SIMONOVIC, M.; SIMONOVIC, J
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THE EFFECT OF WEIGHTLESSNESS ON THE FUNCTIONING OF THE VESTIBULAR APPARATUS OF THE INNER EAR IS STUDIED. IT IS SHOWN THAT THE ABSENCE OF GRAVITY, PARTICULARLY IN COMBINATION WITH OTHER ACCELERATIONS, CAN LEAD TO A NUMBER OF PHYSICAL AND PSYCHOLOGICAL DISTURBANCES IN ASTRONAUTS, SINCE THE ORGAN OF BALANCE OF THE INNER EAR REQUIRES THE PRESENCE OF GRAVITY AS A STIMULUS TO ITS PROPER FUNCTIONING. THE SO-CALLED SPACE SICKNESS CAN OCCUR.
Topics: CONICAL BODIES, FLUIDIZED BED PROCESSORS, GRANULAR MATERIALS, CYLINDRICAL BODIES, HYDRODYNAMICS,...
Recent studies employing graph theoretic techniques from Complex Networks revealed the co-evolution of emergent minimal contact cycles and load-bearing force chains as mesoscopic structures that form the basic building blocks of self-organization. This study demonstrates previously observed trends for two-dimensional assemblages of circular discs to equally apply when network analysis is applied to data from three-dimensional systems comprising non-spherical particles. As previously reported...
Topics: DTIC Archive, MELBOURNE UNIV VICTORIA (AUSTRALIA), *GRANULAR MATERIALS, PARTICLES, STABILITY, THREE...
Topics: NASA Technical Reports Server (NTRS), AGRICULTURE, AIRCRAFT DESIGN, GRANULAR MATERIALS, SPRAYERS,...
We have recently established, in close collaboration with experimentalists (from geology, physics, geotechnical and agricultural engineering), a comprehensive first-of-a-kind knowledge base for state-of-the-art data, characterization and modelling of the behaviour of dense granular systems under quasi-static loading conditions. This behaviour is intrinsically multiscale and is arguably one of, if not, the most challenging to characterize and model of the gamut of granular behaviour encountered...
Topics: DTIC Archive, MELBOURNE UNIV VICTORIA (AUSTRALIA), *GRANULAR MATERIALS, DISSIPATION, FAILURE,...
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168
Jul 21, 2010
07/10
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Whipple, E. C.; Mendis, D. A.; Northrop, T. G
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The potential distribution in a plasma containing dust grains were derived where the Debye length can be larger or smaller than the average intergrain spacing. Three models were treated for the grain-plasma system, with the assumption that the system of dust and plasma is charge-neutral: a permeable grain model, an impermeable grain model, and a capacitor model that does not require the nearest neighbor approximation of the other two models. A gauge-invariant form of Poisson's equation was used...
Topics: COMETS, GRANULAR MATERIALS, TEMPERATURE MEASUREMENT, THERMAL EMISSION, EMISSION SPECTRA, LIGHT...
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509
Jun 2, 2011
06/11
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Wan, Zheng-Min
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This report summarizes the accomplishments made by the MODIS LST (Land-Surface Temperature) group at University of California, Santa Barbara, under NASA Contract. Version 1 of the MODIS Land-Surface Temperature Algorithm Theoretical Basis Document (ATBD) was reviewed in June 1994, version 2 reviewed in November 1994, version 3.1 in August 1996, and version 3.3 updated in April 1999. Based on the ATBD, two LST algorithms were developed, one is the generalized split-window algorithm and another...
Topics: GRANULAR MATERIALS, FLUID MECHANICS, INTERSTITIALS, VISCOUS FLOW, RHEOLOGY, MULTIPHASE FLOW, MARS...
In this final report, we document the achievements made as a result of this Young Investigator Program (YIP) project. We worked on the development of multi scale energy-consistent algorithms to simulate and capture flow phenomena in granular materials. For this, we have made progress in three key areas: i) the development of unprecedented algorithms at the grain scale to simulate flow of complex (real) granular media; ii) the development of multiscale and continuum approaches to simulate the...
Topics: DTIC Archive, CALIFORNIA INST OF TECH PASADENA, *GRANULAR MATERIALS, ALGORITHMS, AVALANCHES,...
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290
Jun 21, 2010
06/10
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Smirnova, P. B
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Photointerpretation of Cosmos 122 satellite television photographs of wave clouds and statistical analysis of rawinsonde wind and temperature data for Siberia
Topics: ABSORPTIVITY, GRANULAR MATERIALS, MICROWAVES, SILICATES, ELECTRICAL RESISTIVITY, RADIATIVE...
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557
Jul 21, 2010
07/10
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Mason, M. L.; Burley, J. R., I
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A static investigation of the internal performance of two short take-off and landing (STOL) nozzle concepts with pitch thrust-vectoring capability has been conducted. An axisymmetric nozzle concept and a nonaxisymmetric nozzle concept were tested at dry and afterburning power settings. The axisymmetric concept consisted of a circular approach duct with a convergent-divergent nozzle. Pitch thrust vectoring was accomplished by vectoring the approach duct without changing the nozzle geometry. The...
Topics: EXTINCTION, GRAIN SIZE, GRANULAR MATERIALS, PHASE TRANSFORMATIONS, SILICATES, ABSORPTION SPECTRA,...
Through a NASA Seed Fund partnership with DEM Solutions Inc., of Lebanon, New Hampshire, scientists at Kennedy Space Center refined existing software to study the electrostatic phenomena of granular and bulk materials as they apply to planetary surfaces. The software, EDEM, allows users to import particles and obtain accurate representations of their shapes for modeling purposes, such as simulating bulk solids behavior, and was enhanced to be able to more accurately model fine, abrasive,...
Topics: NASA Technical Reports Server (NTRS), GRANULAR MATERIALS, ABRASIVES, ELECTROSTATICS, PLANETARY...
For a number of years, there has been under development a mathematical theory of the mechanical behavior of materials composed of discrete elastic grains in direct contact. Eventually, the theory is intended to predict stress-strain relations, stress distributions, vibrations, wave propagation phenomena and criteria of failure for such materials as are found in a bed of dry sand or the pile of grains in the carbon microphone.
Topics: DTIC Archive, Mindlin, R. D., COLUMBIA UNIV NEW YORK, *MECHANICAL PROPERTIES, *GRANULAR MATERIALS,...
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Jul 21, 2010
07/10
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Mathis, J. S
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The observed wavelength dependence of linear polarization, and its variation from region to region can be explained by the following assumptions. Interstellar grains resemble interplanetary grains, in that they are composed of collections of small particles coagulated together into elongated masses. A fraction of the small particles are ferromagnetic. Presumably these are either metallic Fe or magnetite, Fe3O4. If and only if a large grain contains one or more magnetic particles is the grain...
Topics: GOALS, SIZE DISTRIBUTION, GRAIN SIZE, GRANULAR MATERIALS, INTERSTELLAR MATTER, ABUNDANCE, CHEMICAL...
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Jul 11, 2010
07/10
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Woodbury, G. E.; Wallace, J. W
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An investigation was conducted of new techniques used to determine the complete transonic drag characteristics of a series of free-flight drop-test models using principally radar tracking data. The full capabilities of the radar tracking and meteorological measurement systems were utilized. In addition, preflight trajectory design, exact kinematic equations, and visual-analytical filtering procedures were employed. The results of this study were compared with the results obtained from analysis...
Topics: DEOXYGENATION, REDUCTION (CHEMISTRY), GRANULAR MATERIALS, METAL IONS, QUINOLINE, THERMODYNAMIC...
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May 31, 2011
05/11
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Copland, Evan H.; Jacobson, Nathan S
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Coupling the Knudsen effusion method with mass spectrometry has proven to be one of the most useful experimental techniques for studying the equilibrium between condensed phases and complex vapors. The Knudsen effusion method involves placing a condensed sample in a Knudsen cell, a small ''enclosure'', that is uniformly heated and held until equilibrium is attained between the condensed and vapor phases. The vapor is continuously sampled by effusion through a small orifice in the cell. A...
Topics: GRANULAR MATERIALS, MICROGRAVITY, GRAVITATIONAL EFFECTS, SPACEBORNE EXPERIMENTS, FLOW MEASUREMENT,...
Under conditions of isostaticity in granular media, the contact forces for all particles are statically determinate and forces can be computed without recourse to deformation equations or constitutive relationships. Given that stresses represent spatial averages of inter-particle forces, the stress-equilibrium equations for the isostatic state form a hyperbolic system of partial differential equations that describe the internal stress state using only boundary tractions. In this paper, we...
Topics: DTIC Archive, MELBOURNE UNIV VICTORIA (AUSTRALIA) DEPT OF MATHEMATICS AND STATISTICS, *GRANULAR...
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Jul 21, 2010
07/10
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Johnson, P. J.; Hunt, J. L
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Wall static, local stream static, and pitot pressure surveys were made on the windward side of a hypersonic airbreathing missile at full-scale length Reynolds numbers. In the inviscid part of the flow field, the experimental massflow ratios agreed with trends predicted by a three-dimensional method-of-characteristics solution. At a longitudinal station 3.5 diameters downstrea of the nose, the boundary layer was transitional or turbulent at zero incidence but became laminar as the angle of...
Topics: DUST, VELOCITY, GRANULAR MATERIALS, PLASMA DIAGNOSTICS, PLASMA INTERACTIONS, BISMUTH, PARTICLE SIZE...
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Jun 26, 2010
06/10
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Woller, J. A
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Sealing evacuation port and evacuating vacuum container such as space jackets
Topics: ION SOURCES, LAMINATES, POROUS MATERIALS, PRODUCTION ENGINEERING, REFRACTORY METALS, GRANULAR...
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485
May 23, 2011
05/11
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Hsueh, Mei-Chen; Tsai, Timothy K.; Iyer, Ravishankar K
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Dependability evaluation involves the study of failures and errors. The destructive nature of a crash and long error latency make it difficult to identify the causes of failures in the operational environment. It is particularly hard to recreate a failure scenario for a large, complex system. To identify and understand potential failures, we use an experiment-based approach for studying the dependability of a system. Such an approach is applied not only during the conception and design phases,...
Topics: GRANULAR MATERIALS, MICROGRAVITY, SPACE SHUTTLE MISSIONS, GRAVITATIONAL EFFECTS, DEFORMATION,...
Liquifying agents were investigated for preparation of highly concentrated steatite suspensions which are to be spray-dried. Organic additives for improving the molding properties and strength of green compacts are described. Demands on properties of the spray-dried granules are defined with regard to shrinkage of the molded compacts.
Topics: NASA Technical Reports Server (NTRS), DRYING, SPRAYING, TALC, ADDITIVES, GRANULAR MATERIALS,...
This is the final report of a project to grasp various phenomena induced by the high-speed impact of projectiles on sand. These were the behavior of ejecta and the projectile, the penetration depth and speed of the projectile, and fractured grains and pressure distribution.
Topics: DTIC Archive, OSAKA UNIV (JAPAN), *HIGH SPEED PHOTOGRAPHY, *SAND, *PENETRATION, *PROJECTILES,...
Thermal condensation, cold sticking, and sputtering by interstellar shock are combined with a chemical memory of the condensation sequence to account for depletion of aluminum, calcium, and titanium in interstellar gas. The extra depletion of aluminum and calcium becomes an indicator of the structural history of the refractory parts of interstellar grains.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM, CALCIUM, INTERSTELLAR EXTINCTION, INTERSTELLAR GAS,...
A comprehensive theoretical derivation for the equations of motion of granular media in three dimensions. The derivation is based on both the probabilistic theory of motion of discreet particles, and utilizes the concepts of non-local thermodynamics.
Topics: DTIC Archive, Valanis, K. C., ENDOCHRONICS INC VANCOUVER WA, *EQUATIONS OF MOTION, *THERMODYNAMICS,...
This letter supplements the final report of August 1998 on Additional Objective: To Obtain the Structures of Asphalt Composite, which was part of the project Granular Materials Studied by MRI. We had our hydrogen-free bird cage coil rebuilt to get the background signal below that of the hydrogen in asphalt tar. We now present two images, one of tar in asphalt, one of SF6 gas in the pores of the asphalt. The asphalt came from Western Mobile Corporation, Albuquerque. We packed it, while hot, into...
Topics: DTIC Archive, Fukushima, Eiichi, LOVELACE INSTITUTES ALBUQUERQUE NM, *ASPHALT, *GRANULAR MATERIALS,...
Topics: DTIC Archive, Skakov, Yu. A., JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *USSR, PLASTIC...
There is a need for robotic devices to move effectively on and within complex heterogeneous ground like sand, soil and loose rubble. Such devices could perform military reconnaissance and urban search and rescue in such media by running, crawling and jumping on the surface, and even burying and swimming within it. In the biological world, many organisms are specialized to move in and on complex ground. We posit that discovery of principles of superb biological mobility with parallel systematic...
Topics: DTIC Archive, Goldman,Daniel, Georgia Tech Research Corporation Atlanta United States, Robotics,...
The study concerns the dynamics of granular alignments held between rigid walls when the systems are subjected to continuous, large, forces at one end. It turns out that under such dynamical loading, granular chains exhibit peculiar quasi-periodic behavior. A deeper understanding of the physics associated with such behavior could lead to the development of multifaceted frequency sensors and energy harvesting technologies. The work also led to a deeper understanding of the contact forces between...
Topics: DTIC Archive, STATE UNIV OF NEW YORK AT BUFFALO RESEARCH FOUNDATION, *GRANULAR MATERIALS,...
Studies have been conducted to experimentally characterize the ignition and early-time combustion processes in a large-caliber propellant charge confined in a closed chamber and initiated by an in-bed hot ignition source. The experiments involve firings of live propellant charges contained in optically clear well-instrumented plastic chambers. There is a perforation through the chamber wall aligned with the ignition source. The studies simulate the circumstance when charge ignition occurs by a...
Topics: DTIC Archive, AMERICAN SYSTEMS CORP CHANTILLY VA, *EXPLOSION EFFECTS, FLAME PROPAGATION, THERMITE,...
The focus of the symposium was on multiparticle hydrodynamic interactions which lead to fluctuating motion of the particles and resulting particle migration and dispersion or diffusion. Implications of these phenomena were described for sedimentation, fluidization, suspension flows, granular flows, and fiber suspensions. Computer simulation techniques as well as experimental techniques were described. Each session had an invited leadoff talk which overviewed the session topic as well as...
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, PARTICLE DIFFUSION, FLUES, GRANULAR MATERIALS,...
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Jul 21, 2010
07/10
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Kraetschmer, W
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The broad interstellar IR extinction features located at 9.7 and 18 microns wavelength are believed to originate from silicate dust grains. Cosmic abundances suggest that the silicate should have a chemical composition similar to that of olivine, (Mg,Fe)2 SiO4. Olivine is a very common terrestrial silicate mineral of crystalline structure. However, crystalline olivine grains do not fit the interstellar features well. Based on spectroscopic data obtained in laboratory studies and astronomical...
Topics: ASTROPHYSICS, SPECTROSCOPY, SPUTTERING, VAPOR PRESSURE, DATA ACQUISITION, GRANULAR MATERIALS,...
A paper presents the concept of swarms of micron-sized and smaller carriers of sensing equipment, denoted generally as controllable granular matter, to be used in exploring remote planets and interplanetary space. The design and manufacture of controllable granular matter would exploit advances in microelectromechanical systems and nanotechnology. Depending on specific designs and applications, controllable granular matter could have characteristics like those of powders, sands, or aerosols,...
Topics: NASA Technical Reports Server (NTRS), DETECTION, MICROELECTROMECHANICAL SYSTEMS, NANOTECHNOLOGY,...
The bulk behavior of dispersed, fluidized, or undispersed stationary granular systems cannot be fully understood in terms of adhesive/cohesive properties without understanding the role of electrostatic forces acting at the level of the grains themselves. When grains adhere to a surface, or come in contact with one another in a stationary bulk mass, it is difficult to measure the forces acting on the grains, and the forces themselves that induced the cohesion and adhesion are changed. Even if a...
Topics: NASA Technical Reports Server (NTRS), GRANULAR MATERIALS, GRAVITATIONAL EFFECTS, MICROGRAVITY,...
Gripping and holding of objects are key tasks for robotic manipulators. The development of universal grippers able to pick up unfamiliar objects of widely varying shape and surface properties remains, however, challenging. Most current designs are based on the multifingered hand, but this approach introduces hardware and software complexities. These include large numbers of controllable joints, the need for force sensing if objects are to be handled securely without crushing them, and the...
Topics: DTIC Archive, CORNELL UNIV ITHACA NY OFFICE OF SPONSORED PROGRAMS, *ROBOTICS, FRICTION, GRANULAR...
A system incorporating a balanced mechanical resonator and a method for vibration of a sample composed of granular material to generate motion of a powder sample inside the sample holder for obtaining improved analysis statistics, without imparting vibration to the sample holder support.
Topics: NASA Technical Reports Server (NTRS), POWDER (PARTICLES), RESONATORS, GRANULAR MATERIALS, HOLDERS,...
In this research program, consisting of combined experiments, material characterization, modeling and simulations on sheared systems, we have: (a) mapped out the failure mechanism for force chains, and related these failures to the macroscopic state of the system under monotonic biaxial loading, (b) extended these studies to cyclic shear loading, (c) quantified nonaffine deformation at both the mesoscopic and macroscopic length scales, (d) correlated the above mechanisms and related these...
Topics: DTIC Archive, MELBOURNE UNIV ADELAIDE (AUSTRALIA), *GRANULAR MATERIALS, *SOIL MECHANICS, CONTINUUM...
The Collisions Into Dust Experimental (COLLIDE-2) was the second flight of the COLLIDE payload. The payload performs six low-velocity impact experiments to study the collisions that are prevalent in planetary ring systems and in the early stages of planet formation. Each impact experiment is into a target of granular material, and the impacts occur at speeds between 1 and 100 cm/s in microgravity and in a vacuum. The experiments are recorded on digital videotape which is later analyzed. During...
Topics: NASA Technical Reports Server (NTRS), SPACEBORNE EXPERIMENTS, COLLISIONS, IMPACT, LOW SPEED,...
The last decade witnessed a manifest shift in the microprocessor industry towards chip designs that promote parallel computing. Until recently the privilege of a select group of large research centers, Teraflop computing is becoming a commodity owing to inexpensive GPU cards and multi to many-core x86 processors. This paradigm shift towards large scale parallel computing has been leveraged in Chrono, a freely available C++ multi-physics simulation package. Chrono is made up of a collection of...
Topics: DTIC Archive, WISCONSIN UNIV-MADISON DEPT OF MECHANICAL ENGINEERING, *COMPUTERIZED SIMULATION,...
Ergodicity is proved for granular contact forces. To obtain this proof from first principles, this paper generalizes Boltzmann's stosszahlansatz (molecular chaos) so that it maintains the necessary correlations and symmetries of granular packing ensembles. Then it formally counts granular contact force states and thereby defines the proper analog of Boltzmann's H functional. This functional is used to prove that (essentially) all static granular packings must exist at maximum entropy with...
Topics: NASA Technical Reports Server (NTRS), ERGODIC PROCESS, PROVING, GRANULAR MATERIALS, COMPACTING,...
Physical property data of cometary grains are derived primarily from thermal emission measurement and optical scattering. Results consistent with the properties of micrometeorites collected in the stratosphere are described.
Topics: NASA Technical Reports Server (NTRS), COMETS, GRANULAR MATERIALS, TEMPERATURE MEASUREMENT, THERMAL...
In order to understand the behavior of granular deposit subjected to high-speed projectile impact, we perform some experiments and grain-scale numerical simulations. In the high-speed impact experiment, we adopted a new technology to measure the deceleration of projectile after penetrating into sand layer. The observed results together with simple one-dimensional model with Rankine-Hugoniot equations suggests the importance of grain-scale mechanics such as grain crushing to evaluate the...
Topics: DTIC Archive, TSUKUBA UNIV IBARAKI (JAPAN), *GRANULAR MATERIALS, *IMPACT, *MATHEMATICAL MODELS,...
The Army has a requirement to develop methods of strengthening soil to support rapid runway and roadway construction. A study was undertaken on the use of DC current applied to soil to form cementing phases in the soil. Preliminary work was on the use of zinc. aluminum. and iron in a variety of granular materials. Metal ions primarily form soft metal hydroxide gels that produce no immediate soil strengthening. Passing current through soil mixed with an alkali-reactive silicate produces rapid...
Topics: DTIC Archive, Morefield, Sean W, CORPS OF ENGINEERS VICKSBURG MS, *SOIL STABILIZATION,...
