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Now showing items 49 - 64 of 21864

  • H(p) -> H(p) boundedness implies H(p) -> L(p) boundedness

    Han, Yongsheng   Li, Ji   Lu, Guozhen   Wang, Peiyong  

    In this paper, we explore a general method to derive H(p) -> L(p) boundedness from H(p) -> H(p) boundedness of linear operators, an idea originated in the work of Han and Lu in dealing with the multiparameter flag singular integrals ([19]). These linear operators include many singular integral operators in one parameter and multiparameter settings. In this paper, we will illustrate further that this method will enable us to prove the H(p) -> L(p) boundedness on product spaces of homogeneous type in the sense of Coifman and Weiss ([5]) where maximal function characterization of Hardy spaces is not available. Moreover, we also provide a particularly easy argument in those settings such as one parameter or multiparameter Hardy spaces H(p)(R(n)) and H(p)(R(n) x R(m)) where the maximal function characterization exists. The key idea is to prove parallel to f parallel to(Lp) <= C parallel to f parallel to(Hp) for f is an element of L(q) boolean AND H(p) (1 < q < infinity, 0 < p <= 1). It is surprising that this simple result even in this classical setting has been absent in the literature.
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  • A new model of the L–H transition and H-mode power threshold

    WU, Xingquan; XU, Guosheng; WAN, Baonian; RASMUSSEN, Jens Juul; NAULIN, Volker; NIELSEN, Anders Henry; CHEN, Liang; CHEN, Ran; YAN, Ning; SHAO, Linming  

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  • Development of a 1 L/h Scale Liquid Hydrogen System

    Garceau, N. M.; Baik, J. H.; Kim, S. Y.; Oh, I. H.; Karng, S. W.  

    A small-scale hydrogen liquefaction plant consists of cryocooler, cryostat, liquid nitrogen (LN2) precooling bath, two ortho-para (o-p) hydrogen converters, a heat pipe, multilayer insulations (MLI), sensors and auxiliary components. The liquefaction plant was designed as both a cryocooler- cooled liquefier and a long-term zero boil-off liquid storage reservoir. A Gifford-McMahon (GM) cryocooler was selected as a cold sink and purchased from Cryomech Inc. A vacuumjacketed 200 L capacity cryostat was designed to provide highly efficient thermal protection to LH2 storage space. A heat pipe was uniquely designed and installed in the cryostat to enhance heat transfer between the cryocooler and hydrogen gas and liquid. A LN2-cooled precooling bath was designed to act as a precooler and an o-p hydrogen converter. MLT blankets with hydrogen getter under high vacuum in the cryostat minimize heat loss into LH2 storage. All the components were carefully assembled in dust, oil and solvent-free environment with extra caution of vacuum tightness followed by dry nitrogen and helium purge. After initial cool-down of the cryocooler under vacuum, 99.999% of 300K hydrogen gas was introduced to the liquefaction plant. From a series of liquefaction tests with or without LN2 precooling, the hydrogen liquefaction plant successfully demonstrated 1.4 L/h of hydrogen liquefaction with LN2 precooling and two o-p hydrogen converters, and 0.7 L/h without LN2 precooling.
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  • Dynamics of L–H transition and I-phase in EAST

    Xu, G.S.   Wang, H.Q.   Xu, M.   Wan, B.N.   Guo, H.Y.   Diamond, P.H.   Tynan, G.R.   Chen, R.   Yan, N.   Kong, D.F.   Zhao, H.L.   Liu, A.D.   Lan, T.   Naulin, V.   Nielsen, A.H.   Juul Rasmussen, J.   Miki, K.   Manz, P.   Zhang, W.   Wang, L.   Shao, L.M.   Liu, S.C.   Chen, L.   Ding, S.Y.   Zhao, N.   Li, Y.L.   Liu, Y.L.   Hu, G.H.   Wu, X.Q.   Gong, X.Z.  

    The turbulence and flows at the plasma edge during the L-I-H, L-I-L and single-step L-H transitions have been measured directly using two reciprocating Langmuir probe systems at the outer midplane with several newly designed probe arrays in the EAST superconducting tokamak. The E x B velocity, turbulence level and turbulent Reynolds stress at similar to 1 cm inside the separatrix ramp-up in the last similar to 20 ms preceding the single-step L-H transition, but remain nearly constant near the separatrix, indicating an increase in the radial gradients at the plasma edge. The kinetic energy transfer rate from the edge turbulence to the E x B flows is significantly enhanced only in the last similar to 10 ms and peaks just prior to the L-H transition. The E x B velocity measured inside the separatrix, which is typically in the electron diamagnetic drift direction in the L-mode, decays towards the ion diamagnetic drift direction in response to fluctuation suppression at the onset of the single-step L-H, L-I-L as well as L-I-H transitions. One important distinction between the L-I-H and the L-I-L transitions has been observed, with respect to the evolution of the edge pressure gradient and mean E x B flow during the I-phase. Both of them ramp up gradually during the L-I-H transition, but change little during the L-I-L transition, which may indicate that a gradual buildup of the edge pedestal and mean E x B flow during the I-phase leads to the final transition into the H-mode. In addition, the transition data in EAST strongly suggest that the divertor pumping capability is an important ingredient in determining the transition behaviour and power threshold.
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  • Development of a 1 L/h Scale Liquid Hydrogen System

    Garceau, N. M.   Baik, J. H.   Kim, S. Y.   Oh, I. H.   Karng, S. W.  

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  • Air blast injuries killed the crew of the submarine H. L. Hunley

    Lance, Rachel M.   Stalcup, Lucas   Wojtylak, Brad   Bass, Cameron R.  

    The submarine H. L. Hunley was the first submarine to sink an enemy ship during combat; however, the cause of its sinking has been a mystery for over 150 years. The Hunley set off a 61.2 kg (135 lb) black powder torpedo at a distance less than 5 m (16 ft) off its bow. Scaled experiments were performed that measured black powder and shock tube explosions underwater and propagation of blasts through a model ship hull. This propagation data was used in combination with archival experimental data to evaluate the risk to the crew from their own torpedo. The blast produced likely caused flexion of the ship hull to transmit the blast wave; the secondary wave transmitted inside the crew compartment was of sufficient magnitude that the calculated chances of survival were less than 16% for each crew member. The submarine drifted to its resting place after the crew died of air blast trauma within the hull.
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  • H. L. Malchow,Special Relations: The Americanization of Britain?

    Review by: James E. Cronin  

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  • Intelligente L?sungen für die Versorgung mit H?rimplantaten

    Bauer-Delto   Angelika  

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  • Aktienrecht – H?chstrichterliche Rechtsprechung () || L. Unternehmensvertr?ge

    Professor Dr. Hartwig Henze / Manfr,    Henze, Hartwig   Born, Manfred   Drescher, Ingo  

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  • Spatio-temporal evolution of the H?→?L back transition

    Miki, K.   Diamond, P. H.   Schmitz, L.   McDonald, D. C.   Estrada, T.   Gu?rcan, O?. D.   Tynan, G. R.  

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  • Spatio-temporal evolution of the H -> L back transition

    Miki, K.   Diamond, P. H.   Schmitz, L.   McDonald, D. C.   Estrada, T.   Guercan, Oe. D.   Tynan, G. R.  

    Since ITER will operate close to threshold and with limited control, the H -> L back transition is a topic important for machine operations as well as physics. Using a reduced mesoscale model [Miki et al., Phys. Plasmas 19, 092306 (2012)], we investigate ELM-free H -> L back transition dynamics in order to isolate transport physics effects. Model studies indicate that turbulence spreading is the key process which triggers the back transition. The transition involves a feedback loop linking turbulence and profiles. The I-phase appears during the back transition following a slow power ramp down, while fast ramp-downs reveal a single burst of zonal flow during the back transition. The I-phase nucleates at the pedestal shoulder, as this is the site of the residual turbulence in H-mode. Hysteresis in the profile gradient scale length is characterized by the Nusselt number, where Nu = chi(i,turb)/chi(i,neo). Relative hysteresis of temperature gradient vs density gradient is sensitive to the pedestal Prandtl number, where Pr-ped = D-ped/chi(i,neo). We expect the H-mode to be somewhat more resilient in density than in temperature. (C) 2013 AIP Publishing LLC.
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  • Adsorption of formate species on Cu(h,k,l) low index surfaces

    Chutia, Arunabhiram   Silverwood, Ian P.   Farrow, Matthew R.   Scanlon, David O.   Wells, Peter P.   Bowker, Michael   Parker, Stewart F.   Catlow, C. Richard A.  

    We report a density functional theory study on the relative stability of formate species on Cu(h,k,l) low index surfaces using a range of exchange-correlation functionals. We find that these functionals predict similar geometries for the formate molecule adsorbed on the Cu surface. A comparison of the calculated vibrational transition energies of a perpendicular configuration of formate on Cu surface shows an excellent agreement with the experimental spectrum obtained from inelastic neutron spectroscopy. From the calculations on adsorption energy we find that formate is most stable on the Cu(110) surface as compared to Cu(111) and Cu(100) surfaces. Bader analysis shows that this feature could be related to the higher charge transfer from the Cu(110) surface and optimum charge density at the interfacial region due to bidirectional electron transfer between the formate and the Cu surface. Analysis of the partial density of states finds that in the -5.5 eV to -4.0 eV region, hybridization between O p and the non-axial Cu d(yz) and d(xz) orbitals takes place on the Cu(110) surface, which is energetically more favourable than on the other surfaces. (C) 2016 The Authors. Published by Elsevier B.V.
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  • INHIBITORY POTENTIAL OF SOME CHALCONES ON CATHEPSINS B, H AND L

    raghav, neera; garg, shweta  

    Cathepsins, intracellular proteases, are known to be involved in a number of physiological processes such as degradation of extracellular proteins, prohormone processing, progressions of atherosclerosis etc. High levels of cathepsins have also been indicated in various pathological conditions like arthritis, cancer etc. One of the reasons for these elevated levels is attributed to a decrease in inhibitor concentration. Therefore, the work on the identification of small molecular weight compounds as inhibitors of cysteine proteases is of great therapeutic significance. In the present work, we report the synthesis of a small library of chalcones and a study of their role as inhibitors of cysteine proteases. After a preliminary screening of the compounds as inhibitors of cysteine proteases in general, studies were carried out to evaluate their inhibitory effects on cathepsin B, H and L. The most potent inhibitors among all the compounds were nitro substituted compounds for cathepsin B and cathepsin L and chloro substituted compounds for cathepsin H, respectively.
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  • Ohne Prophylaxe geht’s bei Migr?ne h?ufig nicht

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  • Intimate Memoirs || Understanding A. L. H. (1948)

    A. Leon Higginbotham Jr.  

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  • Carpobrotus edulis (L.) NE Br. (Aizoaceae) and its presence in the Chilean flora

    Sotes, Gaston J.   Cavieres, Lohengrin A.   Rodriguez, Roberto  

    The genus Carpobrotus was represented on the Chilean flora only by native species C. chilensis. However, we found that the species native of South Africa C. edulis is naturalized in coastal areas. We report it for first time as an alien species for the Chilean territory.
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