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Full-Text Articles in Physical Sciences and Mathematics
Performance Analysis Of A Rankine Cycle Integrated With The Goswami Combined Power And Cooling Cycle, Ricardo Vasquez Padilla, Antonio Ramos Archibold, Gokmen Demirkaya, Saeb Besarati, D Yogi Goswami, Muhammad M. Rahman, Elias L. Stefanakos
Performance Analysis Of A Rankine Cycle Integrated With The Goswami Combined Power And Cooling Cycle, Ricardo Vasquez Padilla, Antonio Ramos Archibold, Gokmen Demirkaya, Saeb Besarati, D Yogi Goswami, Muhammad M. Rahman, Elias L. Stefanakos
Dr Ricardo Vasquez Padilla
Improving the efficiency of thermodynamic cycles plays a fundamental role in reducing the cost of solar power plants. These plants work normally with Rankine cycles which present some disadvantages due to the thermodynamic behavior of steam at low pressures. These disadvantages can be reduced by introducing alternatives such as combined cycles which combine the best features of each cycle. In this paper, a combined Rankine–Goswami cycle (RGC) is proposed and a thermodynamic analysis is conducted. The Goswami cycle, used as a bottoming cycle, uses ammonia–water mixture as the working fluid and produces power and refrigeration while power is the primary …
Effects Of Ether Vs. Ester Linkage On Lipid Bilayer Structure And Water Permeability., S. Deren Guler, D. Dipon Ghosh, Jianjun Pan, John Mathai, Mark Zeidel, John Nagle, Stephanie Tristram-Nagle
Effects Of Ether Vs. Ester Linkage On Lipid Bilayer Structure And Water Permeability., S. Deren Guler, D. Dipon Ghosh, Jianjun Pan, John Mathai, Mark Zeidel, John Nagle, Stephanie Tristram-Nagle
Prof. Stephanie Tristram-Nagle Ph.D.
The structure and water permeability of bilayers composed of the ether-linked lipid, dihexadecylphosphatidylcholine (DHPC), were studied and compared with the ester-linked lipid, dipalmitoylphosphaditdylcholine (DPPC). Wide angle X-ray scattering on oriented bilayers in the fluid phase indicate that the area per lipid A is slightly larger for DHPC than for DPPC. Low angle X-ray scattering yields A=65.1A(2) for DHPC at 48 degrees C. LAXS data provide the bending modulus, K(C)=4.2x10(-13)erg, and the Hamaker parameter H=7.2x10(-14)erg for the van der Waals attractive interaction between neighboring bilayers. For the low temperature phases with ordered hydrocarbon chains, we confirm the transition from a tilted …
Structure And Water Permeability Of Fully Hydrated Diphytanoylpc., Stephanie Tristram-Nagle, Dong Joo Kim, Nadia Akhunzada, Norbert Kucerka, John Mathai, John Katsaras, Mark Zeidel, John Nagle
Structure And Water Permeability Of Fully Hydrated Diphytanoylpc., Stephanie Tristram-Nagle, Dong Joo Kim, Nadia Akhunzada, Norbert Kucerka, John Mathai, John Katsaras, Mark Zeidel, John Nagle
Prof. Stephanie Tristram-Nagle Ph.D.
Diphytanoylphosphatidylcholine (DPhyPC) is a branched chain lipid often used for model membrane studies, including peptide/lipid interactions, ion channels and lipid rafts. This work reports results of volume measurements, water permeability measurements P(f), X-ray scattering from oriented samples, and X-ray and neutron scattering from unilamellar vesicles at T=30 degrees C. We measured the volume/lipid V(L)=1426+/-1A(3). The area/lipid was found to be 80.5+/-1.5A(2) when both X-ray and neutron data were combined with the SDP model analysis (Kucerka, N., Nagle, J.F., Sachs, J.N., Feller, S.E., Pencer, J., Jackson, A., Katsaras, J., 2008. Lipid bilayer structure determined by the simultaneous analysis of neutron and …
Structure Of Fully Hydrated Fluid Phase Lipid Bilayers With Monounsaturated Chains., Norbert Kucerka, Stephanie Tristram-Nagle, John Nagle
Structure Of Fully Hydrated Fluid Phase Lipid Bilayers With Monounsaturated Chains., Norbert Kucerka, Stephanie Tristram-Nagle, John Nagle
Prof. Stephanie Tristram-Nagle Ph.D.
Quantitative structures are obtained at 30 degrees C for the fully hydrated fluid phases of palmitoyloleoylphosphatidylcholine (POPC), with a double bond on the sn-2 hydrocarbon chain, and for dierucoylphosphatidylcholine (di22:1PC), with a double bond on each hydrocarbon chain. The form factors F(qz) for both lipids are obtained using a combination of three methods. (1) Volumetric measurements provide F(0). (2) X-ray scattering from extruded unilamellar vesicles provides /F(qz)/ for low q(z). (3) Diffuse X-ray scattering from oriented stacks of bilayers provides /F(qz)/ for high q(z). Also, data using method (2) are added to our recent data for dioleoylphosphatidylcholine (DOPC) using methods …
Massive Star Forming Cores And Outflows Found By Analysis Of Astronomical Data, Hontas Farmer
Massive Star Forming Cores And Outflows Found By Analysis Of Astronomical Data, Hontas Farmer
Hontas F Farmer
Like gems hidden in mountains of sand, I have sifted through vast amounts of data which have been gathered by surveys covering wide areas of the sky at particular wavelengths, and found likely star forming cores, hints of circumstellar disk and outflows in regions of massive star formation. The procedural lesson from my masters thesis is that there are discoveries waiting to be made by comparing data sets gathered at different frequencies, and by conducting coordinated multi-spectral surveys of massive star forming regions.
Water Places: Cultural, Social And More-Than-Human Geographies Of Nature, Leah Gibbs
Water Places: Cultural, Social And More-Than-Human Geographies Of Nature, Leah Gibbs
Leah Maree Gibbs
Cultural, social and more-than-human approaches to nature research are largely held apart in the discipline of human geography. In this paper I argue that these three approaches can be brought together to good effect. The paper presents a situated account of 'water places' in inland Australia-namely the artesian bores, boredrains and boredrain wetlands of the Birdsville Track-in order to demonstrate that together, these three approaches can reveal the complex interactions that form particular places, and comprise a more-than-human world. This account explores the layers of interaction that have formed these water places, including their insertion into the landscape through drilling, …