New process makes fluoropolymer foams with controllable amounts of inert-gas fillings in foam cells.
NASA Technical Reports Server (NTRS)
Foam cell formation is the most important process in atherosclerosis, and low density lipoprotein oxidation by reactive oxygen species (ROS) is the key step in the conversion of macrophages to foam cells. This study reveals the control mechanism of the gene for NADPH oxidase 1 (Nox1), which produces ROS in the ...
PubMed
Background aimsClinical trials for therapeutic angiogenesis use blood- or bone marrow-derived hematopoietic cells, endothelial progenitor cells (EPC) and mesenchymal stromal cells (MSC) for vascular regeneration. Recently concerns have emerged that all three cell types could also contribute to atherosclerosis by ...
PubMed Central
Atherosclerosis regression is an important clinical goal. In previous studies of regression in mice, the rapid loss of plaque foam cells was explained by emigration to lymph nodes, a process reminiscent of dendritic cells. In the present study, plaque-containing arterial segments from apoE?/? mice were ...
... of the blowing gas from foams (outgassing) when ... the diffusion constant for a foam to its ... obtained on closed cell polyurethane, epoxy and silicone ...
DTIC Science & Technology
... Title : Cell-Size Distribution of Microporous Foams,. Corporate Author : ... Polystyrene foam cell-size distribution is presented as an example. ...
... treatment with G2-phase checkpoint abrogators may sensitize cancer cells ... development of drugs that abrogate the G2-phase checkpoint for potential ... ...
NBII National Biological Information Infrastructure
The authors conclude that foam drainage rates are strongly dependent on cell size, which can be expected to vary with pressure in the foam generator. Therefore, any judgment of foam stability at least must consider the effects of generation technique and pressure on the foam structure. Both ...
Energy Citations Database
In open-cell foams, the overall thermal conductivity of the system will increase because of the open transfer of air into the cells through convection. ...
NASA Website
An experiment was conducted at LLL that required low-density, fine-celled foams uniformly loaded with rubidium. Foams meeting these requirements were produced by impregnating foams made from polyacrylonitrile with rubidium fluoride. Foams with densities f...
National Technical Information Service (NTIS)
In this Phase I program, open-celled rigid polyurethane foams were ... In Phase I, it was demonstrated that rigid polyurethane foams with a variety of glass ...
Hollow sphere foams(ie. closed cell foam) of silicon carbide are ideal as the base for lightweight space telescope mirrors. As seen below, Morton Advanced ...
... foam further optimized for density and physical properties . ... LOI using this intumescent flame retardant, the foam passed the vertical flame test. ...
Clearly, therefore, secondary impacts on the foam ligaments act to ..... foam cell ligaments induced repeated shocks, increasing fragment entropy and ...
External Tank's Spray On Foam Insulation (SOFI) is applied ... Generic Flight Loads on ET Foam Applications ... Figure 3.5 Cell Geometry, NCFI24-124 ...
A pressurization process has been developed for making open cell foams out of closed cell foams, thus, eliminating undesirable blowing agents. The pressure needed to open cells depends on the foam's chemical structure and density. The process does not significantly ...
... Accession Number : ADA474713. Title : The Origin and Significance of Mammary Intraductal Foam Cells. Descriptive Note : Final rept. ...
... Title : The Origin and Significance of Mammary Intraductal Foam Cells. ... Their origin has been presumed to be of ductal lining epithelium. ...
May 31, 2011 ... Establishing the geometry of foam cells is useful in developing microstructure- based acoustic and structural models. ...
An investigation to find an open cell foam polymer for vacuum insulation has shown an epoxy-modified isocyanurate foam to be superior to urea/formaldehyde foams. Though improved during the study, the urea/formaldehyde foams still had problems of being too friable, dimensionally unstable, ...
... Overexpression of Muc4 has been shown to block cell-cell and cell-matrix interactions, protect tumor cells from immune surveillance and promote ...
... in Hela cells abrogated the spindle checkpoint expectedly. ... BIOLOGY), DISSOCIATION, SURVEILLANCE, INSTABILITY, SPINDLES, GENOME. ...
This thesis is intended to improve the understanding of foaming behaviors in various foam injection molding processes: structural foam molding, gas counter pressure molding, and gas counter pressure with mold opening. The foaming behavior in foam injection molding is different from ...
NASA Astrophysics Data System (ADS)
The impact behavior of a low-density urethane foam was investigated experimentally, and the crushing characteristics of the rigid closed-cell foam were determined as a function of impact velocity, foam sample thickness, and temperature. The dynamic crushi...
... Accession Number : ADD253357. Title : Thermal Shock Behavior of Open-Cell Ceramic Foams. Descriptive Note : Journal article,. ...
Source of Acquisition. 1 NASA Marshall Space Flight. Thermal Expansion of Three Closed Cell Polymeric Foams at Cryogenic Temperatures ...
innovative process for manufacturing open-cell. silicon foam for use in lightweight silicon mirrors. Potential Commercial Applications (Limit 200 words) ...
Open cell metallic foam core sandwich panel structures are of interest for application in spacecraft
... Accession Number : ADA459819. Title : Fire Resistant Composite Closed Cell Foam and Nonwoven Textiles for Tents and Shelters. ...
... Accession Number : ADD440385. Title : Diffusion of Gases in Closed Cell Foams: A Comparison of Experiment with Theory,. Corporate Author : ...
PROJECT TITLE: Deployable Antennas of Open-Celled Foam Construction. TECHNICAL ABSTRACT (LIMIT 200 WORDS). The goal of the proposed program is to ...
of a polymeric foam. On the other hand, closed-cell foams may be formed by direct foaming of a ceramic slurry is the Surface Evolver [13]. This consists of software expressly designed for the modeling of soap bubbles, foamsLiquid Foams D. Weaire, �� S.J. Cox �� and ...
E-print Network
We report a foaming-polymerization method to prepare stable polyaniline (PANI)/polyvinyl alcohol (PVA) foams. The formation mechanism of the foam materials is investigated and the photoelectric conversion properties of PANI/PVA foams are studied in detail. The enhancement of photoelectric conversion behavior in ...
When inserted in the gas side of a hydraulic accumulator, elastomeric foams can reduce the thermal loss and significantly improve the efficiency of this device. In this study, an open-cell polyester-urethane foam was placed in a 2.5 liter piston-type accumulator and cycled 36,000 times at 0.025 Hz. No significant chemical breakdown was ...
Paper (PDF format) given at the DOE 2000 Review - OTT Fuel Cells Program by the inventor of highly conductivity carbon foam, describes a novel carbon foam with high conductivity and applications in heat exchangers.
NSDL National Science Digital Library
Rigid, closed-cell, polyurethane foam consists of interconnected polyurethane plates which form cells. When this foam is compressed, it exhibits an initial elastic regime which is followed by a plateau regime in which the load required to compress the foa...
086 Cleaning Open-cell Polyurethane Foam for Flight Use. Author(s): Fred Gross ... Most of the polyurethane foams do not meet the acceptable outgassing ...
Post Test PPO Foam Specimen Cell Wall, 93 x, 50 kg/m 3 ...... Undoubtedly the PPO cell edges could be strenthened by depositing a different resin ..... or a phenolic cutter was used to remove the foam within the cylindrical blade. After ...
... Several methods for reducing the cell size normally obtained during processing will be described. It will be shown that small cells are formed at ...
Because of their layered structure, thermotropic smectic mesogens can form stable foams. In this study, two-dimensional foams of 8CB are prepared in the smectic A phase. We determine the structures of the foam cells and study the aging dynamics. Three stages of foam evolution are distinguished. ...
Screening of a total of 86 crude drugs for retinoid X receptor (RXR) ligands demonstrated that the methanol extract of the bark of Magnolia obovata markedly activated the transcriptional activity of RXRalpha in luciferase reporter assays. Thereafter, honokiol (1) was isolated as a constituent able to activate RXR selectively as a natural rexinoid, but not RARalpha. The activity of 1 was more ...
This review focuses on the role of monocytes in the early phase of atherogenesis, before foam cell formation.
The effects of geometric parameters of open-cell aluminum foams on the performance of aluminum foam-phase change material (PCM) composites as heat sinks are investigated by experiments. Three types of open-cell aluminum 6061 foams with similar relative densities and different ...
A closed cell rigid polyurethane foam has been prepared which contains up to about 60% by weight of molecular sieves capable of sorbing molecules with effective critical diameters of up to about 10 .ANG.. The molecular sieve component of the foam can be preloaded with catalysts or with reactive compounds that can be released upon ...
A closed cell rigid polyurethane foam has been prepared which contains up to about 60% by weight of molecular sieves capable of sorbing molecules with effective critical diameters of up to about 10 A. The molecular sieve component of the foam can be preloaded with catalysts or with reactive compounds that can be released upon ...
This paper describes the intended application and development effort required to braze the copper foam to the stainless steel tubing.
DOE Information Bridge
This patent describes an electric current-generating cell comprising: an open-cellular foamed multiple thermocouple having a conductive matrix with conductors of different material from the matrix embedded in the foam matrix with a portion of each conductor exposed on the inside of the cells; a vessel containing ...
Page 1. AD_____ Award Number: DAMD17-03-1-0712 TITLE: The Origin and Significance of Mammary Intraductal Foam Cells ...
Preliminary acoustic studies have indicated that low-density, open-cell, metal foams may be suitable
A porous media approach is implemented in a finite element frame work to model ... The porous media approach is applied to model the foam thermal strain and ...
May 9, 2009 ... The paper titled Shear Moduli for Non-isotropic, Open Cell Foams Using a General Elongated Kelvin Foam Model has been accepted for ...
work also investigated cell harvesting by "foam fractionation" in which the foam formed by the aeration of the cultures via air lift mixing was collected and found to...
National Renewable Energy Laboratory (NREL)
[5] Yasensky J, Christiansen E. Hypervelocity impact evaluation of metal foam core sandwich structures,. NASA Johnson Space Center, Houston, 2008, ...
... wild animals, synthetic fertilizers, biomass burning, biofuel . ... is now used primarily within rigid plastic insulating foams ("closed cell foams"). ...
Further compounding efforts are expected to improve resilience. ... highly resilient open cell flexible foams. These foams are in- ...
... Solid Waste, Wastes (Industrial), Incinerators, Hazardous Material, Foam, Plastic, Polyurethane, Polyester Plastics, Polyethers, Aircraft, Military ...
Rigid, closed-cell, polyurethane foam consists of interconnected polyurethane plates which form cells. When this foam is compressed, it exhibits an initial elastic regime which is followed by a plateau regime in which the load required to compress the foam remains nearly constant. In the ...
A closed cell rigid polyurethane foam has been prepared which contains up to about 60% by weight of molecular sieves capable of sorbing molecules with effective critical diameters of up to about 10 A. The molecular sieve component of the foam can be prelo...
A radiant energy exchanger is disclosed which comprises a relatively thin layer of gas permeable open-celled semi-opaque plastic foam, a layer of transparent gas impermeable plastic material on the side of the foam exposed to the atmosphere, and a layer of a gas impermeable reflective material on the other side of the ...
Organic foams having a low density and very small cell size and method for producing same in either a metal-loaded or unloaded (nonmetal loaded) form are described. Metal-doped foams are produced by soaking a polymer gel in an aqueous solution of desired ...
The room temperature mechanical properties of a closed-cell, polyurethane encapsulant foam have been measured as a function of foam density. Tests were performed on both unfilled and filler reinforced specimens. Over the range of densities examined, the m...
... Title : Low-Density, Salt-Loaded Foams,. ... conducted at LLL that required low-density, fine-celled ... with rubidium fluoride, Foams with densities from 0.0 ...
Theoretical micromechanical models for the elastic response of solid foams are developed. Idealized two-dimensional closed-cell foams are considered to be spatially periodic with either hexagonal or square network structure; while three-dimensional open-c...
it was shown that gas diffusion in closed-cell foams is driven by partial pressure only and not by temperature gradient. The value of the foam effective thermal conductivity can be predicted rapidly and accurately by the developed ECVA code, when the diff...
Closed-cell metallic foams were fabricated by bonding millimeter sized hollow spheres at points of contact. The composition of low density metallic foams with hollow sphere architecture achieved to date includes Ti-6Al- 4V, 400 series stainless steel, and...
The Surface Evolver was used to compute the equilibrium microstructure of dry soap foams with random structure and a wide range of cell-size distributions. Topological and geometric properties of foams and individual cells were evaluated. The theory for isotropic Plateau polyhedra describes the dependence of ...
Foaming of multiphase blend systems can be identified as a promising approach to satisfy the steadily growing demand for cellular materials with enhanced properties. However, combining the sophisticated fields of polymer blends and polymer foams not only offers great chances, but also poses a significant challenge, as the multiphase characteristics of ...
's Ratio Reticulated Polyurethane Foams Yun-Che Wang , Roderic Lakes �, and Amanda Butenhoff Department's ratio reticulated polyurethane foams", adapted from Cellular Polymers, 20, 373-385, (2001). Abstract Several foams of different cell-size, including Scott Industrial polyurethane foam ...
In the present paper a novel procedure for describing the solid geometry of open cell foams is introduced, facilitating the establishment of a corresponding FEM model for simulating the material behaviour in micro-tension. Open-cell Al-foams were fabricated using the polymer impregnating method. A serial sectioning ...
