725 research outputs found
Existence of homoclinic travellingwaves in infinite lattices
No full textBy using critical point theory, we investigate the existence of homoclinic travelling waves in an one-dimensional infinite lattice with nearest-neighbor interactions and a on-site potential (density) f . The system is described by the infinite system of second-order differential equations:
qj + f \u27(qj(t)) =V \u27(qj+1(t)-qj(t))-V \u27(qj(t)-qj-1(t)), t ? R, j ? Z,
where f, V ? C1(R,R). We establish three new criteria ensuring the existence of non-trivial homoclinic travelling wave solutions, for any given speed c bigger (or smaller) than some constant depending on f and V. Relevant results in the literatures are extended
Spin correlations in top quark pair production near threshold at the e(+)e(-) linear collider
No full textWe investigate the spin correlations in top quark pair production near the threshold at the e(+)e(-) linear collider. Comparing with the results above the threshold region, we find that near the threshold region the off-diagonal basis, the optimized decomposition of the top quark spins above the threshold region, does not exist, and the beamline basis is the optimal basis, in which there are the dominant spin components: the up-down (UD) component for e(L)- e(+) scattering and the down-up (DU) component for e(R)(-)e(+) scattering can make up more than 50% of the total cross section, respectively.Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)0ARTICLE6687-6924
Characteristics of colliding sea breeze gravity current fronts: a laboratory study
No full textAuthor Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Quarterly Journal of the Royal Meteorological Society 143 (2017): 1434–1441, doi:10.1002/qj.3015.Sea and land breeze circulations driven by surface temperature differences between
land and sea often evolve into gravity currents with sharp fronts. Along narrow
peninsulas, islands and enclosed seas, sea/land breeze fronts from opposing shorelines
may converge and collide and may initiate deep convection and heavy precipitation.
Here we investigate the collision of two sea breeze gravity current fronts in an
analogue laboratory setting. We examine these collisions by means of ‘lock-exchange’
experiments in a rectangular channel. The effects of differences in gravity current
density and height are studied. Upon collision, a sharp front separating the two currents
develops. For symmetric collisions (the same current densities and heights) this front is
vertical and stationary. For asymmetric collisions (density differences, similar heights)
the front is tilted, changes shape in time and propagates in the same direction as the
heavier current before the collision. Both symmetric and asymmetric collisions lead to
upward displacement of fluid from the gravity currents and mixing along the plane
of contact. The amount of mixing along the collision front decreases with asymmetry.
Height differences impact post-collision horizontal propagation: there is significant
propagation in the same direction as the higher current before collision, independent
of density differences. Collisions of two gravity current fronts force sustained ascending
motions which increase the potential for deep convection. From our experiments we
conclude that this potential is larger in stationary collision fronts from symmetric
sea breeze collisions than in propagating collision fronts from asymmetric sea breeze
collisions.National Science Foundation Grant Number: OCE-0824636;
Office of Naval Research Grant Number: N00014-09-1-0844;
National Aeronautics and Space Administration Grant Number: NASA NNX14A078
A Dominant Dissociation Mode of cis-Dichloroethylene on Si(100)2 x 1: Adjacent Si Dimer Double Dechlorination
No full textComposite life cycle of tropical mesoscale convective systems from geostationary and low Earth orbit satellite observations: method and sampling considerations
No full textISI Document Delivery No.: 164FG Times Cited: 0 Cited Reference Count: 48 Cited References: ARNAUD Y, 1992, J APPL METEOROL, V31, P443, DOI 10.1175/1520-0450(1992)0312.0.CO;2 Boer ER, 1997, J GEOPHYS RES-ATMOS, V102, P21383, DOI 10.1029/97JD00930 Bouniol D, 2010, Q J ROY METEOR SOC, V136, P323, DOI 10.1002/qj.557 Capderou M, 2009, METHA TROPIQUES SAMP Cetrone J, 2009, Q J ROY METEOR SOC, V135, P305, DOI 10.1002/qj.389 Chambon P, 2012, GEOSCI REMOTE SENS L, P1 Chambon P, 2012, Q J R METEOROL SOC, DOI 10.1002/qj.1907 COTTON WR, 1989, MON WEATHER REV, V117, P765, DOI 10.1175/1520-0493(1989)1172.0.CO;2 Del Genio AD, 2012, SURV GEOPHYS, V33, P637, DOI 10.1007/s10712-011-9148-9 Diongue A, 2002, Q J ROY METEOR SOC, V128, P1899, DOI 10.1256/003590002320603467 DUVEL JP, 1989, MON WEATHER REV, V117, P2782, DOI 10.1175/1520-0493(1989)1172.0.CO;2 Evans JL, 1996, J APPL METEOROL, V35, P638, DOI 10.1175/1520-0450(1996)0352.0.CO;2 Fiolleau T, 2010, THESIS Fiolleau T, 2009, D21CG AMMAEU Fiolleau T, 2013, IEEE T GEOSCIENCE RE, DOI 10.1109/TGRS.2012.2227762 Fiolleau T, 2012, COMPOSITE CONVECTIVE Futyan, 2007, J CLIMATE, V20, P5041 Grandpeix JY, 2010, J ATMOS SCI, V67, P881, DOI 10.1175/2009JAS3044.1 Hou AY, 2008, PRECIPITATION ADV ME HOUZE RA, 1982, J METEOROL SOC JPN, V60, P396 HOUZE RA, 1981, REV GEOPHYS, V19, P541, DOI 10.1029/RG019i004p00541 Houze RA, 2004, REV GEOPHYS, V42, P8755 Inoue T, 2009, J METEOROL SOC JPN, V87, P381, DOI 10.2151/jmsj.87A.381 Kirstetter P.-E., 2012, Q J R METEOROL SOC, DOI 10.1002/qj.1964 Kondo Y, 2006, MON WEATHER REV, V134, P1581, DOI 10.1175/MWR3132.1 Kummerow C, 2000, J APPL METEOROL, V39, P1965, DOI 10.1175/1520-0450(2001)0402.0.CO;2 Laing AG, 2011, MON WEATHER REV, V139, P2832, DOI 10.1175/2011MWR3500.1 Laing AG, 1997, Q J ROY METEOR SOC, V123, P389, DOI 10.1002/qj.49712353807 Liu CT, 2007, J CLIMATE, V20, P489, DOI 10.1175/JCLI4023.1 Machado LAT, 2004, MON WEATHER REV, V132, P714, DOI 10.1175/1520-0493(2004)1322.0.CO;2 Machado LAT, 1998, MON WEATHER REV, V126, P1630, DOI 10.1175/1520-0493(1998)1262.0.CO;2 MADDOX RA, 1980, B AM METEOROL SOC, V61, P1374, DOI 10.1175/1520-0477(1980)0612.0.CO;2 MAPES BE, 1993, MON WEATHER REV, V121, P1398, DOI 10.1175/1520-0493(1993)1212.0.CO;2 Mathon V, 2001, Q J R METEOROL SOC, V72, P105 MCANELLY RL, 1989, MON WEATHER REV, V117, P784, DOI 10.1175/1520-0493(1989)1172.0.CO;2 Mohr KI, 1996, B AM METEOROL SOC, V77, P1179, DOI 10.1175/1520-0477(1996)0772.0.CO;2 Nesbitt SW, 2006, MON WEATHER REV, V134, P2702, DOI 10.1175/MWR3200.1 Pritchard MS, 2011, J ATMOS SCI, V68, P1821, DOI 10.1175/2011JAS3699.1 Roca R, 2013, MON WEATER REP UNPUB Roca R, 2000, J CLIMATE, V13, P1286, DOI 10.1175/1520-0442(2000)0132.0.CO;2 Roca R, 2010, CR GEOSCI, V342, P390, DOI 10.1016/j.crte.2010.01.003 Szantai A, 2011, QUALITY GEOSTATIONAR Tomasini M, 2006, DU213A AMMAEU Viltard N, 2006, J APPL METEOROL CLIM, V45, P455, DOI 10.1175/JAM2346.1 Viollier M, 2009, J ATMOS OCEAN TECH, V26, P2161, DOI 10.1175/2009JTECHA1264.1 WILLIAMS M, 1987, MON WEATHER REV, V115, P505, DOI 10.1175/1520-0493(1987)1152.0.CO;2 Yuan JA, 2010, J CLIMATE, V23, P5864, DOI 10.1175/2010JCLI3671.1 Yuter SE, 1998, Q J ROY METEOR SOC, V124, P53, DOI 10.1256/smsqj.54503 Fiolleau, Thomas Roca, Remy CNES; CNRS Discussions with Drs N. Viltard, M. Capderou and D. Bouniol are greatly acknowledged. The long-lasting support of the Climserv team and of K. Ramage and S. Cloche, in particular, as well as the help of J. Aublanc with the processing of the data is very much appreciated. CNES and CNRS have supported this study. We thank the reviewers and QJRMS Editor for their insightful comments that improved the paper. 0 WILEY-BLACKWELL HOBOKEN Q J ROY METEOR SOC SI BThe ability of the current and upcoming space-borne microwave observing systems to document precipitation processes during the life cycle of tropical convective systems is investigated with emphasis on sampling considerations. A composite technique is introduced that will serve as a Day 1 algorithm for the Megha-Tropiques mission. It is exemplified using the Tropical Rainfall Measurement Mission (TRMM) satellite observations from the TRMM Microwave Imager (TMI) instrument and the fleet of operational geostationary infrared images for the boreal summer 2009 over the whole intertropical belt. At the system scale, over both land and oceanic regions, rainfall is overall strong at the beginning (the first third) of the life cycle and then smoothly decreases as the system shrinks and dissipates. Larger rain yields are observed for the land systems (approximate to 6 mm h-1 maximum) compared to the systems over ocean (approximate to 4 mm h-1 maximum). An in-depth analysis of the sensitivity of the results to various aspects of the sampling is performed using simulated observations. The benefit of using various platforms is discussed, including considerations of constellation configuration. The entire Tropics as well as regional scales are explored, revealing the expected improvements from the inclusion of the Megha-Tropiques observations. The sampling results are also strongly supportive of the use of multiple-platform microwave observations from the upcoming Global Precipitation Mission constellation to build a mesoscale convective system precipitation composite life cycle, although the merging of the parameters derived from various resolution radiometers would deserve further investigations. Copyright (c) 2013 Royal Meteorological Societ
Joint Probability Distribution and the Minimum of a Set of Normalized Random Variables
No full textAbstractSuppose that n types of components M1, M2… Mn are combined to form and integrated object I and suppose that y units of the integrated object are required to be formed. Assuming that not all components can be used in forming the integrated objects, let qj be the percentage of usable components of the jth type, a random variable having a probability density function fj(qj). Let wj be the normalized random variable obtained from qj by wj = qj/μj, where μj is the expected value of qj. Consider the random variable W=Min{wj, 1 ≤ j ≤ n}. This paper describes the joint probability distribution of the set of the normalized random variables and determines the probability distribution of the minimum W of this set. The expected value of W is key to determining the number of components needed to form the y integrated objects. A special case is presented where the percentages of usable components are uniformly distributed. The problem is applied to a production model
Comparisons of static, quasi-static and dynamic 3D porous media scale network models for two-phase immiscible flow in porous media
No full textA dynamic 3D pore-scale network model is formulated for investigating the effect of interfacial tension and oil-water viscosity during chemical flooding. The model takes into account both viscous and capillary forces in analyzing the impact of chemical properties on flow behavior or displacement configuration, while the static model with conventional invasion percolation algorithm incorporates the capillary pressure only. From comparisons of simulation results from these models. it indicates that the static pore scale network model can be used successfully when the capillary number is low. With the capillary increases due to the enhancement of water viscosity or decrease of interfacial tension, only the quasi-static and dynamic model can give insight into the displacement mechanisms
Characteristics of inertial gravity waves over Southern Africa as simulated with CAM-EULAG
No full textDataSheet1_Gut microbes combined with metabolomics reveal the protective effects of Qijia Rougan decoction against CCl4-induced hepatic fibrosis.pdf
No full textBackground: The occurrence and development of Hepatic fibrosis (HF) are closely related to the gut microbial composition and alterations in host metabolism. Qijia Rougan decoction (QJ) is a traditional Chinese medicine compound utilized clinically for the treatment of HF with remarkable clinical efficacy. However, its effect on the gut microbiota and metabolite alterations is unknown. Therefore, our objective was to examine the impact of QJ on the gut microbiota and metabolism in Carbon tetrachloride (CCl4)-induced HF.Methods: 40% CCl4 was used to induce HF, followed by QJ administration for 6 weeks. Serum biochemical analyses, histopathology, immunohistochemistry, RT-PCR, 16S rRNA gene sequencing, and non-targeted metabolomics techniques were employed in this study to investigate the interventional effects of QJ on a CCl4-induced HF model in rats.Results: This study demonstrated that QJ could effectively ameliorate CCl4-induced hepatic inflammation and fibrosis. Moreover, QJ upregulated the expression of intestinal tight junction proteins (TJPs) and notably altered the abundance of some gut microbes, for example, 10 genera closely associated with HF-related indicators and TJPs. In addition, metabolomics found 37 key metabolites responded to QJ treatment and strongly associated with HF-related indices and TJPs. Furthermore, a tight relation between 10 genera and 37 metabolites was found post correlation analysis. Among them, Turicibacter, Faecalibaculum, Prevotellaceae UCG 001, and unclassified Peptococcaceae may serve as the core gut microbes of QJ that inhibit HF.Conclusion: These results suggest that QJ ameliorates hepatic inflammation and fibrosis, which may be achieved by improving intestinal tight junctions and modulating gut microbiota composition as well as modulating host metabolism.</p
Table2_Gut microbes combined with metabolomics reveal the protective effects of Qijia Rougan decoction against CCl4-induced hepatic fibrosis.XLSX
No full textBackground: The occurrence and development of Hepatic fibrosis (HF) are closely related to the gut microbial composition and alterations in host metabolism. Qijia Rougan decoction (QJ) is a traditional Chinese medicine compound utilized clinically for the treatment of HF with remarkable clinical efficacy. However, its effect on the gut microbiota and metabolite alterations is unknown. Therefore, our objective was to examine the impact of QJ on the gut microbiota and metabolism in Carbon tetrachloride (CCl4)-induced HF.Methods: 40% CCl4 was used to induce HF, followed by QJ administration for 6 weeks. Serum biochemical analyses, histopathology, immunohistochemistry, RT-PCR, 16S rRNA gene sequencing, and non-targeted metabolomics techniques were employed in this study to investigate the interventional effects of QJ on a CCl4-induced HF model in rats.Results: This study demonstrated that QJ could effectively ameliorate CCl4-induced hepatic inflammation and fibrosis. Moreover, QJ upregulated the expression of intestinal tight junction proteins (TJPs) and notably altered the abundance of some gut microbes, for example, 10 genera closely associated with HF-related indicators and TJPs. In addition, metabolomics found 37 key metabolites responded to QJ treatment and strongly associated with HF-related indices and TJPs. Furthermore, a tight relation between 10 genera and 37 metabolites was found post correlation analysis. Among them, Turicibacter, Faecalibaculum, Prevotellaceae UCG 001, and unclassified Peptococcaceae may serve as the core gut microbes of QJ that inhibit HF.Conclusion: These results suggest that QJ ameliorates hepatic inflammation and fibrosis, which may be achieved by improving intestinal tight junctions and modulating gut microbiota composition as well as modulating host metabolism.</p
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