The PhD thesis

Durrani, Sami; Wooding, E. R.

doi:10.1088/0031-9112/22/12/027

Cited by 6 publications

(6 citation statements)

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“…• Coherent production of vector mesons off deuterium is characterized by two contributions: single and double scattering contributions (figure 16). Moreover, it is a well-known fact from the photoproduction experiments [183,184] that at large −t 0.6 GeV 2 , the double scattering contribution can be unambiguously isolated (figure 17).…”

Section: Colour Coherent Effects With Coherent Vector Meson Productio...mentioning

confidence: 88%

“…The technical advantage of using the deuteron in coherent reactions is the possibility of detecting the recoil deuterons. [183,184]. The dashed, dash-dotted, dotted and solid curves represent single scattering, double scattering interference between single and double scattering and full contributions, respectively.…”

Section: Colour Coherent Effects With Coherent Vector Meson Productio...mentioning

confidence: 99%

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Hadrons in the nuclear medium

Sargsian¹,

Arrington²,

Bertozzi³

et al. 2003

J. Phys. G: Nucl. Part. Phys.

100

170

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Quantum chromodynamics (QCD), the microscopic theory of strong interactions, has not yet been applied to the calculation of nuclear wavefunctions. However, it certainly provokes a number of specific questions and suggests the existence of novel phenomena in nuclear physics which are not part of the traditional framework of the meson-nucleon description of nuclei. Many of these phenomena are related to high nuclear densities and the role of colour in nucleonic interactions. Quantum fluctuations in the spatial separation between nucleons may lead to local high-density configurations of cold nuclear matter in nuclei, up to four times larger than typical nuclear densities. We argue here that experiments utilizing the higher energies available upon completion of the Jefferson Laboratory energy upgrade will be able to probe the quarkgluon structure of such high-density configurations and therefore elucidate the fundamental nature of nuclear matter. We review three key experimental programmes: quasi-elastic electro-disintegration of light nuclei, deep inelastic scattering from nuclei at x > 1 and the measurement of tagged structure functions. These interrelated programmes are all aimed at the exploration of the quark structure of high-density nuclear configurations.The study of the QCD dynamics of elementary hard processes is another important research direction and nuclei provide a unique avenue to explore these dynamics. In particular, we argue that the use of nuclear targets and large values of momentum transfer at energies available with the Jefferson Laboratory upgrade would allow us to determine whether the physics of the

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Section: Colour Coherent Effects With Coherent Vector Meson Productio...mentioning

confidence: 88%

Section: Colour Coherent Effects With Coherent Vector Meson Productio...mentioning

confidence: 99%

Hadrons in the nuclear medium

Sargsian¹,

Arrington²,

Bertozzi³

et al. 2003

J. Phys. G: Nucl. Part. Phys.

100

170

View full text Add to dashboard Cite

show abstract

“…Based on these assumptions, one can derive simple formulae for the optimal enzyme levels and maximal pathway flux. Later studies repeated this result and generalized it to linear pathways of any size [17,18,21]. Here, we will revisit this general solution and extend it to other types of rate laws beyond the one considered by Waley [20] (which, from now on, we will refer to as mass-action ).…”

Section: Resultsmentioning

confidence: 81%

Optimal enzyme profiles in unbranched metabolic pathways

Noor,

Liebermeister

2024

Interface Focus.

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How to optimize the allocation of enzymes in metabolic pathways has been a topic of study for many decades. Although the general problem is complex and nonlinear, we have previously shown that it can be solved by convex optimization. In this paper, we focus on unbranched metabolic pathways with simplified enzymatic rate laws and derive analytic solutions to the optimization problem. We revisit existing solutions based on the limit of mass-action rate laws and present new solutions for other rate laws. Furthermore, we revisit a known relationship between flux control coefficients and enzyme abundances in optimal metabolic states. We generalize this relationship to models with density constraints on enzymes and metabolites, and present a new local relationship between optimal reaction elasticities and enzyme amounts. Finally, we apply our theory to derive simple kinetics-based formulae for protein allocation during bacterial growth.

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“…Power was supplied to the discharge through an inline bidirectional Bird Thru-line coupler and power meter. Forward and reflected powers were measured on the oscilloscope (Durrani 1988), since the CW power meter could not be used for the pulsed RF discharge measurements. This problem was solved by calibrating an oscilloscope by using CW power.…”

Section: Methodsmentioning

confidence: 99%

“…The CW power was recorded from a Bird Thru-line power meter model 4431 and voltage from the oscilloscope. For all the experimental investigations reported here, including current, voltage, input and reflected power measurements, we used the same discharge chamber and techniques of Vidaud et al (1988) and Durrani (1988). In brief, the aluminium electrodes were Bruce-profiled discs of diameter 1.7 cm that were independently water-cooled and could be moved to a separation of up to 2.0 cm.…”

Section: Methodsmentioning

confidence: 99%

Measurements of striation formation time in an N₂ α RF discharge

1997

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Measurements have been made of the striation formation time of an α-type RF discharge in nitrogen as a function of pressure, RF frequency, electrode separation and input power. A theoretical model is proposed that yields electron energy and density and striation formation time, given the measured discharge parameters of interelectrode voltage and separation, gas pressure and RF frequency. It is found that increasing the pressure and the electrode separation increase the striation formation time, while increasing the power and the RF frequency decrease the striation formation time. The model predicts that striations in the RF discharge are formed when the plasma charge density reaches some critical value at which the space charge distorts the interelectrode field.

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The PhD thesis

Cited by 6 publications

References 0 publications

Hadrons in the nuclear medium

Hadrons in the nuclear medium

Optimal enzyme profiles in unbranched metabolic pathways

Measurements of striation formation time in an N₂ α RF discharge

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The PhD thesis

Cited by 6 publications

References 0 publications

Hadrons in the nuclear medium

Hadrons in the nuclear medium

Optimal enzyme profiles in unbranched metabolic pathways

Measurements of striation formation time in an N2 α RF discharge

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Measurements of striation formation time in an N₂ α RF discharge