Production of the final state in K−d interactions at 5.5 GeV/c

Werner, B.; Davis, R.; Ammar, R.; Kropac, W.; Yarger, H. L.; Cho, Y.; Derrick, M.; Johnson, D.; Musgrave, B.; Wangler, T.P.; Griffiths, David J.

doi:10.1016/0550-3213(70)90176-8

Cited by 17 publications

(5 citation statements)

References 11 publications

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“…The fact that the index is larger than unity means that for suitable geometries radiation emitted at different times and locations can reach a given observer at the same time. In such situations, the pulses are thus compressed in time, and consequently the frequency spectra of the emitted radiation can ex-tend up to very high frequencies well in the GHz regime (Alvarez-Muñiz et al, 2012;De Vries et al, 2011;Werner et al, 2012). Many such high-frequency results have recently been presented (Huege et al, 2012b;Carvalho Jr., 2012;De Vries et al, 2012), and they all agree qualitatively in their prediction of a "Cherenkov ring" appearing at high frequencies.…”

Section: Refractive Index Effectsmentioning

confidence: 61%

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Theory and simulations of air shower radio emission

Huege¹

2013

AIP Conference Proceedings

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A precise understanding of the radio emission from extensive air showers is of fundamental importance for the design of cosmic ray radio detectors as well as the analysis and interpretation of their data. In recent years, tremendous progress has been made in the understanding of the emission physics both in macroscopic and microscopic frameworks. A consistent picture has emerged: the emission stems mainly from time-varying transverse currents and a time-varying charge excess; in addition, Cherenkov-like compression of the emission due to the refractive index gradient in the atmosphere can lead to time-compression of the emitted pulses and thus high-frequency contributions in the signal. In this article, I discuss the evolution of the modelling in recent years, present the emission physics as it is understood today, and conclude with a description and comparison of the models currently being actively developed.Comment: Proceedings of the ARENA2012 conference (Erlangen, Germany), to be published in AIP Conference Proceeding

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Section: Refractive Index Effectsmentioning

confidence: 61%

“…• EVA (Werner et al, 2012) employs the same time-domain emission calculation as MGMR, but parameterizes the air shower particle distributions on the basis of individual CONEX simulations. It thus has no free parameters to set.…”

Section: Macroscopic Approachesmentioning

confidence: 99%

Theory and simulations of air shower radio emission

Huege¹

2013

AIP Conference Proceedings

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“…At late times, when most of the turbulent energy has decayed, the spectrum stops evolving (orange and red lines): it peaks at γ − 1 ∼ γ th0 (1 + σ 0 /2) − 1 4, and extends well beyond the peak into a nonthermal tail of ultra-relativistic particles, with power-law slope p = −d log N/d log(γ − 1) ∼ 2.9. The inset shows that the value of the power-law slope is not universal: for fixed δB 2 rms0 /B 2 0 , the tail becomes harder with increasing σ 0 , in agreement with [32] and in analogy to the results of PIC simulations of relativistic magnetic reconnection [54][55][56][57][58]; more dramatically, at a fixed magnetization σ 0 , the spectrum is much harder for stronger turbulent fluctuations (i.e., at δB 2 rms0 /B 2 0 1). The power-law slopes quoted in the inset of Fig.…”

mentioning

confidence: 66%

“…Acceleration by the reconnection electric field [54][55][56] governs the first phase of particle energization, as shown in Fig. 5.…”

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confidence: 99%

Particle Acceleration in Relativistic Plasma Turbulence

2018

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Due to its ubiquitous presence, turbulence is often invoked to explain the origin of nonthermal particles in astrophysical sources of high-energy emission. With particle-in-cell simulations, we study decaying turbulence in magnetically-dominated (or equivalently, "relativistic") pair plasmas. We find that the generation of a power-law particle energy spectrum is a generic by-product of relativistic turbulence. The power-law slope is harder for higher magnetizations and stronger turbulence levels. In large systems, the slope attains an asymptotic, system-size-independent value, while the highenergy spectral cutoff increases linearly with system size; both the slope and the cutoff do not depend on the dimensionality of our domain. By following a large sample of particles, we show that particle injection happens at reconnecting current sheets; the injected particles are then further accelerated by stochastic interactions with turbulent fluctuations. Our results have important implications for the origin of non-thermal particles in high-energy astrophysical sources.

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“…Chemical structure of valdecoxib Several HPLC-UV methods have been reported for valdecoxib estimation in biological samples like human urine 7 , plasma 8,9 . Valdecoxib has analytical methods for bioequivalence studies 10 , metabolite determination [11][12][13] and estimation of formulation 14 , HPTLC method for simultaneous estimation in tablet dosage form 15 . The aim of the current study is to develop a simple, rapid and reliable method for estimation of valdecoxib in human plasma using RP-HPLC technique and to validate the method according to guidelines provided by the Food and Drug Administration (FDA) 16 .…”

Section: Introductionmentioning

confidence: 99%

Determination of Valdecoxib in Human Plasma Using Reverse Phase HPLC

Sahu

Sankar

Annapurna

2010

Journal of Chemistry

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An RP-HPLC analytical method for estimation of valdecoxib in human plasma was developed and validated. Protein precipitation and valdecoxib extraction from plasma (200 µL) was carried out by adding 800 µL perchloric acid (5%, v/v in water) containing nimesulide as the internal standard followed by vortex mixing and centrifugation. The supernatant (20 µL) was then injected onto an ODS C 18 (25 cm×4.6 mm) column from Shimadzu. The mobile phase comprised of acetonitrile and water (35: 65) with a total run time of 12 min and the wavelength of the detector was set at 244 nm. The extraction recovery of valdecoxib from plasma was >95% and the calibration curve was linear (r 2 = 0.999) over valdecoxib concentrations ranging from 20 to 1400 µg/mL (n = 10). The method had an accuracy of >92% and LOD and LLOQ of 3.58 µg/mL and 13.45 µg/mL respectively. The method reported is simple, reliable, precise, accurate and has the capability of being used for determination of Valdecoxib in clinical settings.

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Production of the final state in K−d interactions at 5.5 GeV/c

Cited by 17 publications

References 11 publications

Theory and simulations of air shower radio emission

Theory and simulations of air shower radio emission

Particle Acceleration in Relativistic Plasma Turbulence

Determination of Valdecoxib in Human Plasma Using Reverse Phase HPLC

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