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  • 1
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    Ammonia clathrate hydrates [Chemistry] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-09-12
    Description: There is interest in the role of ammonia on Saturn’s moons Titan and Enceladus as the presence of water, methane, and ammonia under temperature and pressure conditions of the surface and interior make these moons rich environments for the study of phases formed by these materials. Ammonia is known to...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 2
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    Indoor Solar Thermal Energy Saving Time with Phase Change Material in a Horizontal Shell and Finned-Tube Heat Exchanger (2015)
    Hindawi
    Details
    Publication Date: 2015-03-24
    Description: An experimental as well as numerical investigation was conducted on the melting/solidification processes of a stationary phase change material (PCM) in a shell around a finned-tube heat exchanger system. The PCM was stored in the horizontal annular space between a shell and finned-tube where distilled water was employed as the heat transfer fluid (HTF). The focus of this study was on the behavior of PCM for storage (charging or melting) and removal (discharging or solidification), as well as the effect of flow rate on the charged and discharged solar thermal energy. The impact of the Reynolds number was determined and the results were compared with each other to reveal the changes in amount of stored thermal energy with the variation of heat transfer fluid flow rates. The results showed that, by increasing the Reynolds number from 1000 to 2000, the total melting time decreases by 58%. The process of solidification also will speed up with increasing Reynolds number in the discharging process. The results also indicated that the fluctuation of gradient temperature decreased and became smooth with increasing Reynolds number. As a result, by increasing the Reynolds number in the charging process, the theoretical efficiency rises.
    Electronic ISSN: 1537-744X
    Topics: Natural Sciences in General
    Published by Hindawi
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  • 3
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    Role of Raf in vascular protection from distinct apoptotic stimuli (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-07-05
    Description: Raf kinases have been linked to endothelial cell survival. Here, we show that basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) differentially activate Raf, resulting in protection from distinct pathways of apoptosis in human endothelial cells and chick embryo vasculature. bFGF activated Raf-1 via p21-activated protein kinase-1 (PAK-1) phosphorylation of serines 338 and 339, resulting in Raf-1 mitochondrial translocation and endothelial cell protection from the intrinsic pathway of apoptosis, independent of the mitogen-activated protein kinase kinase-1 (MEK1). In contrast, VEGF activated Raf-1 via Src kinase, leading to phosphorylation of tyrosines 340 and 341 and MEK1-dependent protection from extrinsic-mediated apoptosis. These findings implicate Raf-1 as a pivotal regulator of endothelial cell survival during angiogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alavi, Alireza -- Hood, John D -- Frausto, Ricardo -- Stupack, Dwayne G -- Cheresh, David A -- CA45726/CA/NCI NIH HHS/ -- CA50286/CA/NCI NIH HHS/ -- CA75924/CA/NCI NIH HHS/ -- P01 CA78045/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2003 Jul 4;301(5629):94-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12843393" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Apoptosis ; Cell Survival ; Cells, Cultured ; Chick Embryo ; Endothelial Growth Factors/pharmacology ; Endothelium, Vascular/*cytology/drug effects ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Fibroblast Growth Factor 2/pharmacology ; Flavonoids/pharmacology ; Humans ; Intercellular Signaling Peptides and Proteins/pharmacology ; Lymphokines/pharmacology ; MAP Kinase Kinase 1 ; Mitochondria/metabolism ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinase 3 ; Mitogen-Activated Protein Kinase Kinases/antagonists & inhibitors/metabolism ; Mitogen-Activated Protein Kinases/metabolism ; Neovascularization, Pathologic ; *Neovascularization, Physiologic/drug effects ; Phosphorylation ; Point Mutation ; Protein Transport ; Protein-Serine-Threonine Kinases/antagonists & inhibitors/metabolism ; Proto-Oncogene Proteins B-raf ; Proto-Oncogene Proteins c-raf/chemistry/genetics/*metabolism ; Signal Transduction ; Umbilical Veins ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors ; p21-Activated Kinases ; src-Family Kinases/antagonists & inhibitors/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Towards an exact description of electronic wavefunctions in real solids (2012)
    Nature Publishing Group (NPG)
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    Publication Date: 2012-12-21
    Description: The properties of all materials arise largely from the quantum mechanics of their constituent electrons under the influence of the electric field of the nuclei. The solution of the underlying many-electron Schrodinger equation is a 'non-polynomial hard' problem, owing to the complex interplay of kinetic energy, electron-electron repulsion and the Pauli exclusion principle. The dominant computational method for describing such systems has been density functional theory. Quantum-chemical methods--based on an explicit ansatz for the many-electron wavefunctions and, hence, potentially more accurate--have not been fully explored in the solid state owing to their computational complexity, which ranges from strongly exponential to high-order polynomial in system size. Here we report the application of an exact technique, full configuration interaction quantum Monte Carlo to a variety of real solids, providing reference many-electron energies that are used to rigorously benchmark the standard hierarchy of quantum-chemical techniques, up to the 'gold standard' coupled-cluster ansatz, including single, double and perturbative triple particle-hole excitation operators. We show the errors in cohesive energies predicted by this method to be small, indicating the potential of this computationally polynomial scaling technique to tackle current solid-state problems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Booth, George H -- Gruneis, Andreas -- Kresse, Georg -- Alavi, Ali -- England -- Nature. 2013 Jan 17;493(7432):365-70. doi: 10.1038/nature11770. Epub 2012 Dec 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Cambridge, Chemistry Department, Lensfield Road, Cambridge CB2 1EW, UK. ghb24@cam.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23254929" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Ab initio calculation of the sound velocity of dense hydrogen: implications for models of Jupiter (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-09-01
    Description: First-principles molecular dynamics simulations were used to calculate the sound velocity of dense hydrogen, and the results were compared with extrapolations of experimental data that currently conflict with either astrophysical models or data obtained from recent global oscillation measurements of Jupiter. Excellent agreement with the extrapolated experimental data was obtained. These results strongly support the notion that the existing models for the jovian interior need to be revised.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alavi, A -- Parrinello, M -- Frenkel, D -- New York, N.Y. -- Science. 1995 Sep 1;269(5228):1252-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Cambridge, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7652571" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry, Physical ; *Extraterrestrial Environment ; *Hydrogen ; *Jupiter ; Physicochemical Phenomena ; Pressure ; Temperature ; Thermodynamics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Sex differences in regional cerebral glucose metabolism during a resting state (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-01-27
    Description: Positron emission tomography was used to evaluate the regional distribution of cerebral glucose metabolism in 61 healthy adults at rest. Although the profile of metabolic activity was similar for men and women, some sex differences and hemispheric asymmetries were detectable. Men had relatively higher metabolism than women in temporal-limbic regions and cerebellum and relatively lower metabolism in cingulate regions. In both sexes, metabolism was relatively higher in left association cortices and the cingulate region and in right ventro-temporal limbic regions and their projections. These results are consistent with the hypothesis that differences in cognitive and emotional processing have biological substrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gur, R C -- Mozley, L H -- Mozley, P D -- Resnick, S M -- Karp, J S -- Alavi, A -- Arnold, S E -- Gur, R E -- MH-42191/MH/NIMH NIH HHS/ -- MH-43880/MH/NIMH NIH HHS/ -- MH-48539/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1995 Jan 27;267(5197):528-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia 19104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7824953" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Basal Ganglia/metabolism ; Brain/*metabolism/radionuclide imaging ; Brain Stem/metabolism ; Cerebellum/metabolism ; Female ; Functional Laterality ; Glucose/*metabolism ; Gyrus Cinguli/metabolism ; Humans ; Limbic System/metabolism ; Male ; Occipital Lobe/metabolism ; Sex Characteristics ; Temporal Lobe/metabolism ; Tomography, Emission-Computed
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Anisotropy of the angular distribution of fission fragments in heavy-ion fusion-fission reactions: The influence of the level-density parameter and the neck thickness (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-24
    Description: Author(s): D. Naderi, M. R. Pahlavani, and S. A. Alavi Using the Langevin dynamical approach, the neutron multiplicity and the anisotropy of angular distribution of fission fragments in heavy ion fusion-fission reactions were calculated. We applied one- and two-dimensional Langevin equations to study the decay of a hot excited compound nucleus. The infl... [Phys. Rev. C 87, 054618] Published Thu May 23, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Metabolic mapping of functional activity in human subjects with the [18F]fluorodeoxyglucose technique (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-05-08
    Description: The 2-[18F]fluoro-2-deoxy-D-glucose technique was used to measure regional cerebral glucose utilization by human subjects during functional activation. Normal male volunteers subjected to one or more sensory stimuli (tactile, visual, or auditory) exhibited focal increases in glucose metabolism in response to the stimulus. Unilateral visual hemifield stimulation caused the contralateral striate cortex to become more metabolically active than the striate cortex ipsilateral to the stimulated hemifield. Similarly, stroking the fingers and hand of one arm with brush produced an increase in metabolism in the contralateral postcentral gyrus, compared with the homologous ipsilateral region. The auditory stimulus, which consisted of a monaurally presented factual story caused an increase in glucose metabolism in the auditory cortex in the hemisphere contralateral to the stimulated ear. These results demonstrate that the technique is capable of providing functional maps in vivo related to both body region and submodality of sensory information in the human brain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greenberg, J H -- Reivich, M -- Alavi, A -- Hand, P -- Rosenquist, A -- Rintelmann, W -- Stein, A -- Tusa, R -- Dann, R -- Christman, D -- Fowler, J -- MacGregor, B -- Wolf, A -- NS 10939-08/NS/NINDS NIH HHS/ -- NS 14867-02/NS/NINDS NIH HHS/ -- NS 15380-04/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1981 May 8;212(4495):678-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6971492" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Auditory Perception/*physiology ; Brain/*metabolism ; *Deoxy Sugars ; *Deoxyglucose/analogs & derivatives/metabolism ; Fluorodeoxyglucose F18 ; Functional Laterality ; Humans ; Male ; Sensation/*physiology ; Tomography, Emission-Computed/*methods ; Visual Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Projector Quantum Monte Carlo Method for Nonlinear Wave Functions (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-04-27
    Description: Author(s): Lauretta R. Schwarz, A. Alavi, and George H. Booth We reformulate the projected imaginary-time evolution of the full configuration interaction quantum Monte Carlo method in terms of a Lagrangian minimization. This naturally leads to the admission of polynomial complex wave function parametrizations, circumventing the exponential scaling of the appro… [Phys. Rev. Lett. 118, 176403] Published Tue Apr 25, 2017
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Investigation of heavy-ion fusion with deformed surface diffuseness: Actinide and lanthanide targets (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-05-04
    Description: Author(s): S. A. Alavi and V. Dehghani By using a deformed Broglia-Winther nuclear interaction potential in the framework of the WKB method, the near- and above-barrier heavy-ion-fusion cross sections of O 16 with some lanthanides and actinides have been calculated. The effect of deformed surface diffuseness on the nuclear interaction pot… [Phys. Rev. C 95, 054602] Published Tue May 02, 2017
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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