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Search Results: 1 - 10 of 464930 matches for " Ronald A. Parise "
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Effective Thermoelectric Power Generation in an Insulated Compartment  [PDF]
Harkirat S. Mann, Yosyp Schwab, Brian N. Lang, Jarrett L. Lancaster, Ronald J. Parise, Giovanna Scarel
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.43020
Abstract:
The Seebeck coefficient S is a temperature- and material-dependent property, which linearly and causally relates the temperature difference T between the “hot” and “cold” junctions of a thermoelectric power generator (TEC-PG) to the voltage difference V. This phenomenon is the Seebeck effect (SE), and can be used to convert waste heat into usable energy. This work investigates the trends of the effective voltage output V(t) and effective Seebeck coefficient S'(t) versus several hours of activity of a solid state TEC-PG device. The effective Seebeck coefficient S'(t) here is related to a device, not just to a material’s performance. The observations are pursued in an insulated compartment in various geometrical and environmental configurations. The results indicate that the SE does not substantially depend on the geometrical and environmental configurations. However, the effective Seebeck coefficient S'(t) and the produced effective
Far Ultraviolet Imagery of the Edge-On Spiral Galaxy NGC 4631
Andrew M. Smith,Nicholas R. Collins,William H. Waller,Morton S. Roberts,Denise A. Smith,Ralph C. Bohlin,K. P. Cheng,Michael N. Fanelli,Susan G. Neff,Robert W. O'Connell,Ronald A. Parise,Eric P. Smith,Theodore P. Stecher
Physics , 2000, DOI: 10.1086/318273
Abstract: Far ultraviolet FUV imagery of the edge-on, Sc/SBd galaxy, NGC 4631 reveals very strong FUV emission, resulting from active star formation, uniformly distributed along the galactic mid- plane. Multi-band imagery, HI and HII position-velocity curves and extinction considerations all imply that the emission is from the outer edges of the visible galaxy. The overall FUV morphology of this edge-on disk system is remarkably similar to those of the so-called "chain galaxies" evident at high redshift, thus suggesting a similar interpretation for at least some of those distant objects. FUV, U, B and V magnitudes, measured for 48 star forming regions, along with corresponding H-alpha and H-beta measurements are used to construct diagnostic color-color diagrams. Although there are significant exceptions, most of the star forming regions are less massive and older than 30 Doradus. Comparison with the expectations from two star formation models yields ages of 2.7 to 10 Myr for the instantaneous burst (IB) model and star formation cut-off ages of 0 to 9 Myr for the continuous star formation (CSF) model. Interpreted in terms of the IB model the photometry implies a total created mass in the 48 star forming regions of 25 million solar-masses. When viewed as resulting from constant star formation the photometry implies a star formation rate of 0.33 solar-masses/yr. These results are compared to those derived from FIR and radio observations. Corrections for FUV emission reprocessed by interstellar grains are estimated.
Lipid Encapsulated Phenolic Compounds by Fluidization  [PDF]
Ronald A. Holser
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2013, DOI: 10.4236/jeas.2013.31002
Abstract:

Phenolic compounds exhibit antioxidant and antimicrobial activities with applications as functional food and feed additives. Ferulic acid, a phenolic compound present in grain crops and lignocellulose biomass, was encapsulated with saturated triglycerides using a laboratory fluidizer. Stability of the encapsulated ferulic acid particles was evaluated over a 3 month storage period. Laser light scattering and fluorescence spectroscopy were used to characterize particles. Loss of ferulic acid from particles was measured by emission spectra. Results showed no significant changes in particle diameter, 717.6 nm ± 28.4 nm, or loss of ferulic acid from lipid particles during storage. This combination of renewable materials, physical processing techniques, and nondestructive analytical methods promotes sustainable agriculture.

Docosahexaenoic Acid Ester Degradation Measured by FTIR-ATR with Correlation Spectroscopy  [PDF]
Ronald A. Holser
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.56045
Abstract: Highly unsaturated fatty acids such as docosahexaenoic acid and linolenic acid are prone to oxidation with a resulting loss of bioactivity and generation of malodorous degradation compounds. Degradation proceeds by formation of the corresponding hydroperoxyl free radical with subsequent oxidative cleavage at the double bond site. FTIR-ATR was used to detect degradation through spectral changes that were correlated to oxidative degradation. The spectrometer was equipped with a heated stage so that a series of spectra could be collected while the sample was exposed to elevated temperatures. The appearance of new bands at 972.8 cm﹣1, 2934 cm﹣1, and 3498 cm﹣1 with the disappearance of bands at 703.6 cm﹣1 and 3013 cm﹣1 were observed after heating and these spectral changes were evaluated by correlation spectroscopy analysis. These results provide a method to quickly detect the oxidative degradation of polyunsaturated fats. This approach is expected to be applied for the quality assessment of feed formulations fortified with omega-3 fatty acids.
Near-Infrared Analysis of Peanut Seed Skins for Catechins  [PDF]
Ronald A. Holser
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.56046
Abstract: Peanuts (Arachis hypogea) produce several phenolic compounds such as catechins that may be isolated as co-products from peanut seed testae or skins during peanut processing. Peanut skins are currently underutilized although they are a potential source of bioactive compounds for use in functional foods and animal feeds. The phenolic compounds in the skins can degrade during processing and lose bioactivity. Extracted peanut skins were analyzed by near-infrared (NIR) spectroscopy to detect phenolic compounds. Spectra were collected from 10000 - 4000 cm﹣1 and evaluated by principal component analysis (PCA) to compare differences in peanut skins before and after alcohol extraction. PCA of derivative spectra showed clear separation into two groups. These results support the development of predictive models to measure catechins in blanched peanut skins.
Sinkhole genesis and evolution in Apulia, and their interrelations with the anthropogenic environment
M. Delle Rose,A. Federico,M. Parise
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2004,
Abstract: Sinkhole development occurs in many areas of the world where soluble rocks crop out. Sinkholes are generally the surface expression of the presence of caves and other groundwater flow conduits in carbonate rocks, which are solutionally enlarged secondary permeability features. Their formation may be either natural or caused by man's activities. In both cases, heavy consequences have to be registered on the anthropogenic environment and related infrastructures. Knowledge of the mechanism of formation of this subtle geohazard is therefore necessary to planners and decision makers for performing the most appropriate and suitable programs of land use and development. The Apulia region of southern Italy is characterized for most of its extension by carbonate rocks, which makes it one of the most remarkable example of karst in the Mediterranean Basin. Based on analysis of literature and in situ surveys, including caving explorations, we have identified in Apulia three main types of possible mechanisms for sinkhole formation: 1) collapse of a chamber in a natural cave or in man-made cavities; 2) slow and gradual enlargement of doline through dissolution; 3) settlement and internal erosion of filling deposits of pre-existing dolines. Since sinkhole formation very often affects directly the human settlements in Apulia, and have recently produced severe damage, some considerations are eventually presented as regards the interrelationships between sinkholes and the anthropogenic environment.
The Ultraviolet Imaging Telescope: Instrument and Data Characteristics
Theodore P. Stecher,Robert H. Cornett,Michael R. Greason,Wayne B. Landsman,Jesse K. Hill,Robert S. Hill,Ralph C. Bohlin,Peter C. Chen,Nicholas R. Collins,Michael N. Fanelli,Joan I. Hollis,Susan G. Neff,Robert W. O'Connell,Joel D. Offenberg,Ronald A. Parise,Joel Wm. Parker,Morton S. Roberts,Andrew M. Smith,William H. Waller
Physics , 1997, DOI: 10.1086/133917
Abstract: The Ultraviolet Imaging Telescope (UIT) was flown as part of the Astro observatory on the Space Shuttle Columbia in December 1990 and again on the Space Shuttle Endeavor in March 1995. Ultraviolet (1200-3300 Angstroms) images of a variety of astronomical objects, with a 40 arcmin field of view and a resolution of about 3 arcsec, were recorded on photographic film. The data recorded during the first flight are available to the astronomical community through the National Space Science Data Center (NSSDC); the data recorded during the second flight will soon be available as well. This paper discusses in detail the design, operation, data reduction, and calibration of UIT, providing the user of the data with information for understanding and using the data. It also provides guidelines for analyzing other astronomical imagery made with image intensifiers and photographic film.
An analysis of process heat recovery in a gas-solid shallow fluidized bed
Pécora, A. A. B.;Parise, M. R.;
Brazilian Journal of Chemical Engineering , 2006, DOI: 10.1590/S0104-66322006000400007
Abstract: this work presents an experimental study of a continuous gas-solid fluidized bed with an immersed horizontal tube. silica sand (254mm diameter) was used as solid particles and air was used for fluidization in a 900mm long and 150mm wide heat exchanger. measurements were made under steady state conditions for a solid particle mass flow rate from 14 to 95kg.h-1 and a number of baffles from 0 to 8. results showed that the heat transfer coefficient increases with the solid particle mass flow rate and with the number of baffles, suggesting that these are important factors to be considered in the design of such equipment. an empirical correlation for the heat transfer coefficient is proposed as a function of solid particle and gas mass flow rate, number of baffles and gas velocity.
Heat transfer coefficient in a shallow fluidized bed heat exchanger with a continuous flow of solid particles
Pécora, Araí A. Bernárdez;Parise, Maria Regina;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2006, DOI: 10.1590/S1678-58782006000300001
Abstract: this work shows the experimental study of a continuous gas-solid fluidized bed with an immersed tube where cold water is heated by fluidized solid particles presenting inlet temperature from 450 to 700°c. experiments were carried out in order to verify the influence of solid particle flow rate and distance between baffles immersed in a shallow fluidized bed. the solid material was 254μm diameter silica sand particles, fluidized by air in a 0.90m long and 0.15m wide heat exchanger. the measurements were taken at steady state conditions for solid mass flow rate from 10 to 100 kg/h, in a heat exchanger with the presence of 5 or 8 baffles. bed temperature measurements along the length of the heat exchanger were experimentally obtained and heat balances for differential control volumes of the heat exchanger were made in order to obtain the axial profile of the bed-to-tube heat transfer coefficient. the results showed that heat transfer coefficient increases with the solid particle mass flow rate and with the presence of baffles, suggesting that these are important factors to be considered in the design of such heat exchanger.
Poly[bis(N,N-dimethylformamide-κO)(μ4-naphthalene-1,5-disulfonato)magnesium(II)]
Lauren A. Borkowski,Debasis Banerjee,John B. Parise
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810017952
Abstract: The structure of the title compound, [Mg(C10H6O6S2)(C3H7NO)2]n, consists of MgO6 octahedra (overline{1} symmetry) connected to naphthalene-1,5-disulfonate ligands (overline{1} symmetry) in the equatoral plane, forming a two-dimensional network propagating parallel to (010). The coordination sphere of the Mg atom is completed by the O atoms of two N,N-dimethylformamide (DMF) molecules in the axial positions. The title compound represents the first time the naphthalene-1,5-disulfonate anion is bound directly to a Mg2+ atom. Disorder over two positions was found in the DMF molecule in a 0.518 (8):0.482 (8) ratio.
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