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Sunanda Banerjee Rohini M Godbole Sreerup Raychaudhuri Ben Allanach Sunanda Banerjee Satyaki Bhattacharyya Debajyoti Choudhury Siba Prasad Das Anindya Datta Rohini M Godbole Monoranjan Guchait Sabine Kraml Gobinda Majumdar David Miller Margarete Mühlleitner Nobuchika Okada Maxim Perelstein Santosh K Rai Sreerup Raychaudhuri Saurabh D Rindani DP Roy K Sridhar Rishikesh Vaidya D Zeppenfeld 《Pramana》2006,67(4):617-637
This is summary of the activities of the working group on collider physics in the IXth Workshop on High Energy Physics Phenomenology
(WHEPP-9) held at the Institute of Physics, Bhubaneswar, India in January 2006. Some of the work subsequently done on these
problems by the subgroups formed during the workshop is included in this report. 相似文献
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Liondas CA; Chrissoulidis DP 《The Quarterly Journal of Mechanics and Applied Mathematics》2007,60(3):275-287
This paper is intended to clarify a misunderstanding concerningthe source singularity of the electric Green's tensor for aperfectly conducting semi-infinite cone of circular cross-section.Tai's series expansion of the Green's tensor is known to lacka singular term at the source region. Jones has reconstructedthe solution to this problem and has pointed out the differencebetween his result and that of Tai. The aim of our paper isto demonstrate that, although Jones's closed-form solution iscorrect, there is a mistake in his comparison with Tai's seriessolution. We conclude that one of the two additional singularterms that Jones claims as missing from Tai's formula must beomitted. Besides, we compare Jones's closed-form solution withSmyshlyaev's solution to the very same problem. We concludethat the magnetic field expressions given by Jones and Smyshlyaevcoincide, but a singular term is missing from Smyshlyaev's expressionfor the electric field. 相似文献
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In this paper, a study is made of the damping influence of the wall on turbulent fluid flow. By considering the oscillation of the whole of the boundary, van Driest's original hypothesis has been extended to obtain the wall damping factor in flow in a duct of constant cross section. The damping factor is used in conjunction with mixing length expressions to obtain the velocity field. Particular examples considered are plane parallel flow and axisymmetric flow in a pipe and in an annulus.
Nomenclature A, A*(=Au/v) Parameter defined in text - b, b*(=bu/v) semi-width of parallel plate channel - c(= 1/A) parameter defined in text - E[, /2] complete elliptic integral of the second kind - d damping factor - F, G, H functions - l, l*(=/v) mixing length - MO, O functions - r, r*(=ru/v) radius - A real part of function - R, S, T, U functions - u, u*(=u/u) velocity in flow direction Z - friction velocity - x, y, z co-ordinates (z in flow direction) - y*(=yu/v) non-dimensional wall distance - fluid density - , eff kinematic viscosity, effective kinematic viscosity - phase angle, or polar coordinate angle - shear stress - (=r/rW) radius ratio - angular velocity Suffixes w wall value - far from a wall 相似文献
Ein Modell für die Mischungslänge von turbulenten Strömungen in Rohren mit konstantem Querschnitt
Zusammenfassung In dieser Arbeit wurde der dämpfende Wandeinfluß in turbulenten Strömungen untersucht. Unter Berücksichtigung der Schwingungen in der gesamten Grenzschicht wurde die ursprüngliche Theorie von van Driest erweitert und ein Dämpfungsfaktor an der Wand in Rohrströmungen mit konstantem Querschnitt ermittelt. Dieser Dämpfungsfaktor diente in Verbindung mit Ausdrücken für die Mischungslänge zur Bestimmung des Geschwindigkeitsfeldes. Ausgewählte Beispiele waren die ebene Parallelströmung sowie die Zylinderströmung in einem Rohr und einem Ringspalt.
Nomenclature A, A*(=Au/v) Parameter defined in text - b, b*(=bu/v) semi-width of parallel plate channel - c(= 1/A) parameter defined in text - E[, /2] complete elliptic integral of the second kind - d damping factor - F, G, H functions - l, l*(=/v) mixing length - MO, O functions - r, r*(=ru/v) radius - A real part of function - R, S, T, U functions - u, u*(=u/u) velocity in flow direction Z - friction velocity - x, y, z co-ordinates (z in flow direction) - y*(=yu/v) non-dimensional wall distance - fluid density - , eff kinematic viscosity, effective kinematic viscosity - phase angle, or polar coordinate angle - shear stress - (=r/rW) radius ratio - angular velocity Suffixes w wall value - far from a wall 相似文献
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The scattering of incident plane elastic waves by a varietyof different defects that lie upon a fluid-solid interface isconsidered here using matched asymptotic expansions. The expansionscheme is developed in terms of a parameter , the ratio of typicaldefect length scale to a typical wavelength of the incidentfield, taken to be small. Three different canonical situations occur and these are illustratedvia three specific examples treated here: a rigid strut, anedge crack, and a rigid strip. In each case the leading-ordermatching is performed to identify the leading-order contributionof the defect to the acoustic field in the far field. In particular,each defect is identified with a source of dipole response ininterfacial stress of displacement. It is shown in the limit as s<<s1 that in the inner problemsthe fluid and solid pieces uncouple in a particularly convenientmanner allowing analytical solutions to be deduced. These arethen matched with appropriate outer solutions. 相似文献
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Harris VH Smith CL Cummins WJ Hamilton AL Hornby DP Williams DM 《Organic & biomolecular chemistry》2003,1(12):2070-2074
The highly mutagenic nucleoside dP (6-(2-deoxy-beta-D-erythro-pentofuranosyl)-3,4-dihydro-6H,8H-pyrimido[4,5-c][1,2]oxazin-2-one) is a bicyclic analogue of N4-methoxy-2'-deoxycytidine. It exists as a mixture of its imino and amino tautomers in solution with a ratio of about 10:1 based on its tautomeric constant. The bicyclic nature of the heterocycle P restrains the amino substituent in an anti conformation and permits effective Watson-Crick base-pairing using either tautomer. The specificity of incorporation of dP by the 3'-5'-exonuclease-free Klenow fragment of DNA polymerase I (exo-free Klenow) has been studied using the 5'-(1-thio)triphosphate dPTP alphaS in combination with phosphorothioate-specific sequencing of the DNA products. The method provides a convenient qualitative assay for studying nucleotide incorporation and reveals for the first time a potential role for the minor tautomeric forms of the natural DNA bases in base misinsertion (substitution mutagenesis) during replication. 相似文献
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Chongbin Zhao B. E. Hobbs A. Ord P. Hornby Shenglin Peng 《Transport in Porous Media》2008,73(1):75-94
In this article, the effect of reactive surface areas associated with different particle shapes on the reactive infiltration
instability in a fluid-saturated porous medium is investigated through analytically deriving the dimensionless pore-fluid
pressure-gradient of a coupled system between porosity, pore-fluid flow and reactive chemical-species transport within two
idealized porous media consisting of spherical and cubic grains respectively. Compared with the critical dimensionless pore-fluid
pressure-gradient of the coupled system, the derived dimensionless pore-fluid pressure-gradient can be used to assess the
instability of a chemical dissolution front within the fluid-saturated porous medium. The related theoretical analysis has
demonstrated that (1) since the shape coefficient of spherical grains is greater than that of cubic grains, the chemical system
consisting of spherical grains is more unstable than that consisting of cubic grains, and (2) the instability likelihood of
a natural porous medium, which is comprised of irregular grains, is smaller than that of an idealized porous medium, which
is comprised of regular spherical grains. To simulate the complicated morphological evolution of a chemical dissolution front
in the case of the chemical dissolution system becoming supercritical, a numerical procedure is proposed for solving this
kind of problem. The related numerical results have demonstrated that the reactive surface area associated with different
particle shapes can have a significant influence on the morphological evolution of an unstable chemical-dissolution front
within fluid-saturated porous rocks. 相似文献
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Debajyoti Choudhury Rahul Sinha S Arunagiri Gautam Bhattacharyya Debrupa Chakraverty Debajyoti Choudhury Amitava Datta Anindya Datta Aseskrishna Datta Amol Dighe Dilip Kumar Ghosh Anjan Giri Stephen King Anirban Kundu Rukmani Mohanta Biswarup Mukhopadhyaya Sreerup Raychaudhuri Saurabh Rindani Probir Roy DP Roy Sourov Roy AI Sanda Nita Sinha Rahul Sinha K Sridhar H Yamamoto 《Pramana》2000,55(1-2):335-345
This report summarises the work done during WHEPP-6 (Institute of Mathematical Sciences, Chennai, India, Jan 3–15, 2000) in
Working group on ‘B and collider physics’. 相似文献
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