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  • 1
    Electronic Resource
    Electronic Resource
    The ferredoxin/thioredoxin system of enzyme regulation in a cyanobacterium (1981)
    Springer
    Archives of microbiology 130 (1981), S. 14-18 
    Details
    ISSN: 1432-072X
    Keywords: Thioredoxin ; Cyanobacterium ; Ferredoxin ; Nostoc ; Regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell-free preparations of the cyanobacterium (bluegreen alga) Nostoc muscorum were assayed for thioredoxins and enzymes catalyzing the ferredoxin and NADP-linked reduction of thioredoxin. Nostoc was found to have two different thioredoxins: one of approximate molecular weight 16,000 (designated Nostoc thioredoxin f) that selectively activated chloroplast fructose 1,6-bisphosphatase, and another of approximate molecular weight 9,000 (designated Nostoc thioredoxin m) that selcetively activated chloroplast NADP-malate dehydrogenase. The two thioredoxins could be reduced either chemically with dithiothreitol or photochemically with ferredoxin and ferredoxin-thioredoxin reductase which, like the recently found regulatory iron-sulfur protein ferralterin, was present in Nostoc cells. Nostoc ferredoxin-thioredoxin reductase appeared to be similar to its chloroplast counterpart in enzyme specificity, molecular weight, and spectral properties. The Nostoc and spinach chloroplast ferredoxin-thioredoxin reductases as well as their thioredoxins, ferredoxins, and chlorophyll containing membranes were interchangeable in activating chloroplast fructose 1,6-bisphosphatase and NADP-malate dehydrogenase. There was no evidence for an NADP-linked thioredoxin reductase such as that of E. coli. The results are in accord with the conclusion that the cyanobacteria resemble higher plants in having a functional ferredoxin/thioredoxin system rather than an NADP/thioredoxin system typical of other bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527065
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  • 2
    Electronic Resource
    Electronic Resource
    FEL gain in the pulsed regime: a comparison between numerical and analytical results (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 21-34 
    Details
    ISSN: 0392-6737
    Keywords: Photoelectric and optoelectronic devices and systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro vengono derivate formule semplici e generali relative al guadagno FEL in regime impulsato. Tali formule tengono conto dell'accoppiamento tra i modi longitudinali e dell'effetto di letargia. Le relazioni di cui sopra sono ottenute nell'ambito di una trattazione numerica delle equazioni di propagazione degli impulsi e sono poi comparate ad analoghe espressioni ottenute per via analitica nel caso limite di pacchetto di elettroni lungo. Si dimostra come l'accordo sia particolarmente buono.
    Abstract: Резюме В зтой статье мы приводим простые и общие формулы для усиления для лазера на свободных злектронах в импульсном режиме, учитывая связь продольных мод и зффект летаргии. Зти соотношения, полченные с помощью численного интегрирования уравнений распространения импульса, затем сравниваются с аналогичными выражениями, полученными аналитически в предельном случае приближения длинного сгустка, и получается хорошее согласие.
    Notes: Summary In this paper we present simple and general formulae for the FEL gain in the pulsed regime including both the longitudinal mode coupling and the lethargy effect. Such relations, obtained from a numerical integration of the pulse propagation equations, are then compared to similar expressions obtained analitycally in the limiting case of the long bunch approximation and the agreement is shown to be excellent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453023
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  • 3
    Electronic Resource
    Electronic Resource
    Spontaneous emission in Ĉerenkov FEL devices: a preliminary theoretical analysis (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1-20 
    Details
    ISSN: 0392-6737
    Keywords: Lasing processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro si discutono le caratteristiche dello spettro della radiazione Ĉerenkov, emessa in guide d'onde circolari e rettangolari riempite con dielettrico. Si analizzano inoltre le proprietà della radiazione emessa da un fascio di elettroni in moto in prossimità e parallelamente alla superficie di una »slab» di dielettrico. Si discute, infine, brevemente, l'importanza di questi risultati per la realizzazione di un possibile FEL-Ĉerenkov.
    Abstract: Резюме Обсуждаются основиые особенности спектральных характеристик спонтанного черенковского излучения в круговых и прямоугольных волноводах, заполненных диэлектриком. Также анализируются характеристики излучения, испущенного электронным пучком, движущимся вблизи и пораллелйно поверхности диэлектрической пластинки. В заключение, вкратце обсуждется применимость полученных результатов в возможных FEL-черенковских приборах.
    Notes: Summary The main features of the spectral characteristics of the spontaneously emitted Ĉerenkov light in circular and rectangular wave guides filled with dielectric are discussed. The characteristics of the radiation emitted by an electron beam moving near and parallel to the surface of a dielectric slab are also analysed. Finally, the relevance of these results to a possible FEL-Ĉerenkov operation is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450085
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  • 4
    Electronic Resource
    Electronic Resource
    The 3-D FEL pulse propagation equation: An analytical treatment in the low-gain and small-signal regime (1991)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 615-632 
    Details
    ISSN: 0392-6737
    Keywords: Laser resonators ; cavities ; amplifiers ; Laser beam deflection and focusing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary In this paper we show that the transverse mode evolution of a FEL operating with short pulses can be treated, in the small-signal and low-gain regime, using a relatively simple mathematical technique leading to a potentially fast numerical algorithm. We also point out that analytical solutions can be obtained for the cases where the slippage length is small compared to the longitudinal bunch length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451286
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  • 5
    Electronic Resource
    Electronic Resource
    Analytical and numerical solutions of some integral equations in radiation transport theory (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1325-1338 
    Details
    ISSN: 0392-6737
    Keywords: Free-electron lasers ; Integral equations ; Functional analysis ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We discuss some mathematical and computational problems relevant to the solutions of both linear and non-linear integral equations arising in radiation transport. By means of a functional-operator approach, analytic solutions for the FEL (Free Electron Laser) integral equations are found in terms of Bessel-Clifford functions. As for applications of this method to non-linear equations, the same technique allows us to obtain an efficient yet simple algorithm for the numerical solution of the Ambartsumian-ChandrasekharH-equation corresponding to a Neumann-series expansion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458819
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  • 6
    Electronic Resource
    Electronic Resource
    Towards a wave theory of charged-beam propagation (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 271-278 
    Details
    ISSN: 0392-6737
    Keywords: Particles in electromagnetic fields (including synchrotron radiation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Using a recentquantum-mechanical treatment of charged-beam propagation in which the emittance plays the role of Planck's constant, we construct a wave theory of the beam transport along guiding systems. We show that the distribution of a beam passing through quadrupole lenses can be described in terms of Gaussian beams. We discuss the role of Twiss parameters within this context and derive anABCD law for charged beam transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457389
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  • 7
    Electronic Resource
    Electronic Resource
    Inhomogeneous broadening effects in high-gain free electron laser operation: A simple parametrization (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 393-404 
    Details
    ISSN: 0392-6737
    Keywords: Photoelectric and optoelectronic devices and systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro si analizzano gli effetti di allargamento inomogeneo in FEL operanti nel regime di alto guadagno. Si presenta una semplice formula che permette di parametrizzare il guadagno in funzione dei parametri inomogenei dovuti allo spread di energia ed alle emittanze. La parametrizzazione è basata su una procedura di interpolazione dei dati numerici. L'accuratezza della interpolazione è migliore dell'1%.
    Abstract: Резюме В этой работе анлизируется влияние эффектов неоднородного уширения на действие лазера на свободных электронах с высоким усилением. Предлагается простая формула для параметризации коэффициента усиления в зависимости от параметров неоднородного уширения, связанных с разбросом энергии и эмиттанса электронного пучка. Параметризация основана на интерполяции численных данных. Точность интерполяции оказывается лучше 1%.
    Notes: Summary In this paper we present a simple parametrization of the effects of gain degradation induced in high-current FELs by the inhomogeneous broadenings due to the energy spread and emittances of the electron beam. The parametrization is based on a fitting procedure of the numerical data. The accuracy of the fit is better than 1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450989
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of the incoherent emission on the FEL pulse width (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 509-516 
    Details
    ISSN: 0392-6737
    Keywords: Photoelectric and optoelectronic devices and systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Gli autori discutono l’effetto della emissione spontanea incoerente sull’ampiezza dell’impulso laser in un FEL nel corso dell’evoluzione del segnale. Le espressioni riportate sono derivate nel contesto della teoria dei supermodi precedentemente sviluppata relativamente al regime di basso guadagno e piccolo segnale e nell’ipotesi di pacchetto di elettroni lungo.
    Abstract: Резюме В этой статье мы обсуждаем влияние некогерентного спонтанного нзлучения на ширину импульса в лазере на свободных электронах. Мы анализируем зависимость пространственной ширины импульса лазера от числа пролетов в рамках теории супер-мод. Мы также исследуем дисторсию, индуцированную в спектре супермод из-за некогерентного излучения.
    Notes: Summary In this paper we discuss the effect of the incoherent spontaneous emission on the FEL pulse width. We analyse the dependence of the laser spatial width on the number of round trips, within the framework of the supermodes’ theory. We also study the distortion induced in the supermode spectrum by the incoherent emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457507
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  • 9
    Electronic Resource
    Electronic Resource
    Cayley–Klein parameters and evolution of two- and three-level systems and squeezed states (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 236-240 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this paper the time behavior of quantum states ruled by Hamiltonians linear in the SU(2), SU(1,1), and SU(3) generators in terms of the Cayley–Klein parameters, originally introduced in classical mechanics is analyzed. Also pointed out is the link between the Cayley–Klein parameters and the Wei–Norman ordering functions, exploited in the context of the Schrödinger representation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529020
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  • 10
    Electronic Resource
    Electronic Resource
    Generating functions of multivariable generalized Bessel functions and Jacobi-elliptic functions (1992)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 33 (1992), S. 25-36 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is pointed out that the Jacobi-elliptic functions are the natural basis to get generating functions of the multivariable generalized Bessel functions. Analytical and numerical results are given of interest for applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529959
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