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  • 1
    Electronic Resource
    Electronic Resource
    The effect of a partially inserted absorbing control rod on the neutron flux density distribution (1961)
    Springer
    Atomic energy 9 (1961), S. 1010-1016 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract This paper presents a method of calculating the effectiveness of a partially inserted absorbing, cylindrical control rod in a reactor without a reflector. The method makes it possible to give a comparatively simple estimate of the distortion of the neutron flux density near the control rod. The calculations are made using the one group equation Δϑ + B2ϑ = 0, with special boundary conditions on the surface of the rod. As an example of the use of the method, the values of B2 and the corresponding flux distributions ϑ have been calculated for several positions of the rod in the reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01487461
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  • 2
    Electronic Resource
    Electronic Resource
    The intensity distribution in the focus of curved-crystal monochromators and an estimate of its influence on precision measurements of lattice parameters (1960)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 13 (1960), S. 832-835 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X60002028
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  • 3
    Electronic Resource
    Electronic Resource
    Chromatic focusing of X-ray diffraction lines and achromatic camera (1964)
    Springer
    Czechoslovak journal of physics 14 (1964), S. 629-645 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conditions for simultaneous suppression of the wave-length component (broadening) and instrumental component (broadening) of the X-ray diffraction lines are analyzed. The fulfilment of the chromatic focusing conditions theoretically restrains the wave-length component as if we used an infinitely narrow wave-length interval in the incident beam. This is advantageous particularly in measuring the line profiles, as the precision of profile analysis can thus be appreciably increased. This paper presents general considerations and computations for a given experimental set-up. A camera suitable for this kind of measurement is described and the profile of a line withϑ=74·3° in an achromatic arrangement and in an ordinary back-reflection camera is compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01688608
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  • 4
    Electronic Resource
    Electronic Resource
    Choice of parameters of an X-ray monochromating unit (1962)
    Springer
    Czechoslovak journal of physics 12 (1962), S. 602-613 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Abstract В последнее время в ра ботах был упомянут ме тод расчета волнового распредел ения в обычных экспериментальных устройствах. В этой статье рассмотрен пример пр именения метода к монохроматизирующ ему элементу Johansson. Показа но, что можно найти условие, при котором можно достигнуть требуемой ширины монохроматизиров анного волнового интервала и максимальную интенсивность. Анализ показывает, что применять очень остр ые фокусы не выгодно, и что кристаллы не должны быть ни очень совершенными, ни слиш ком несовершенными. Оптимальные условия необходимо определи ть специально в каждом конкретном случае.
    Notes: Abstract In recent papers a way of computing the monochromated wavelength distribution in some current experimental arrangements was presented. In this paper an application is shown for the Johansson monochromating unit. The conditions are indicated for attaining the desired breadth of the monochromated interval and for its maximum intensity. The analysis implies that it is not advantageous to use very narrow foci and that the crystals should be neither very perfect nor very imperfect. The optimum conditions must be found in each case separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01690113
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  • 5
    Electronic Resource
    Electronic Resource
    A contribution to the theory of X-ray monochromators (1962)
    Springer
    Czechoslovak journal of physics 12 (1962), S. 588-601 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Abstract Введено понятие характеристической функции, полностью описывающей монорхоматизирующе е действие рентгенов ских монохроматоров. Даны формы этой функции для част о применяемых монохроматизирующи х элементов. Рассмотр ен пример расчета для элемента показывающий услов ия в одном частном слу чае. Кривые, дающие смещение цент ра тяжести волнового ра спределения монохро матического излучения для криста ллов различной степени совершеннос ти, позволяют сделать заключения о влиянии юстировки к ристалла на точные измерения пос тоянных решетки. Пред ложенная модель была проверен а экспериментально. Расчеты для данного экспериментального устройства позволяют п ростое опре деление эффективной ширины кривой отражения, если измерить расстояние между двумя соответственн о выбранными линиями поликристаллическо г о образца. Кроме того, экспериме нтально было установлено, что малый упругий изгиб не изменяет существенно кривую отражения несовершенных крист аллов с хорошими упру гими свойствами, если в кри сталле нет макроскоп ических деформаций.
    Notes: Abstract The characteristic function is introduced, describing completely the monochromating effect of monochromating units. Expressions for this function are presented for monochromating units frequently used. An example of computation for Johansson's unit shows the conditions in a special case. The curves indicating the shift of the wavelength centroid of monochromated radiation for crystals of different perfection allow conclusions to be drawn about the influence of the alignment of the crystal on precision measurements of lattice constants. The experiments verify the suggested model. The computations for a given experimental arrangement permit a simple determination of the effective breadth of the reflection curve, if a distance of two suitably chosen diffraction lines of a polycrystalline specimen is measured. Finally, it was found experimentally that a small elastic bending does not essentially alter the reflection curve of highly elastic and imperfect crystals unless macroscopic distortions are present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01690112
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  • 6
    Electronic Resource
    Electronic Resource
    Graphical solution of chromatic and geometric focusing of X-ray diffraction lines (1964)
    Springer
    Czechoslovak journal of physics 14 (1964), S. 646-651 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A nomograph and a transparent chart, serving for the rapid determination of the simultaneous chromatic and geometric focusing of X-ray diffraction lines, are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01688609
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  • 7
    Electronic Resource
    Electronic Resource
    Wavelength distribution of X-rays in the focus of a monochromator and an estimate of the influence of this distribution on precision measurements of lattice constants (1960)
    Springer
    Czechoslovak journal of physics 10 (1960), S. 215-224 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Abstract Рассчитано распреде ление энергии в φокус е монохроматора с φок усировкой Иогансона при предположении, чт о известно распредел ение яркости в φокусе лампыG(α,) кривая отражения кри сталлаR(α) и распредел ение энергииJ(λ-λ0) пад ающего излучения. Оказывается, что напр имер, местоположение центра тяжести дубле таКα может существенно изменят ься в зависимости от м естоположения крист алла на φокусной окружности, что сильн о может повлиять на то чные измерения посто янных решетки.
    Notes: Abstract Wavelength distribution in the focus of a Johansson type monochromator is computed assuming the tube focus emissivityG(α), reflection curveR(α) and wavelength distribution of the incident radiationJ(λ-λ0) are known. It is shown e.g. that the centre of gravity may be shifted in accordance with the position of the crystal on the focal circle which may considerably influence precision measurements of lattice parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557264
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  • 8
    Electronic Resource
    Electronic Resource
    The distribution of neutron density in the vicinity of a partly inserted black rod in two-group approximation (1961)
    Springer
    Czechoslovak journal of physics 11 (1961), S. 652-659 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Abstract В работе изложен и на ч астном случае проилл юстрирован метод расчета распре деления плотности нейтронов вблизи частично погр уженного цилиндрического сте ржня в реакторе без отража теля. В то время как по теории возмущений расчет эф фективности стержня в зависимост и от глубины погружен ия является довольно простым, воп рос о распределении плот ности нейтронов вбли зи стержня существенно более сл ожный. Тем не менее для некот орых задач оценка изм енения плотности нейтронов, вызванного присутствием стержн я, является необходим ой. Предложенный метод п озволяет определить как эффективность ст ержня в зависимости о т глубины погружения, так в особ енности деформацию плотност и нейтронов вблизи ст ержня. В предыдущей работе [1] та же задача была решена по одногрупповой тео рии. В настоящей работе исх одным пунктом является дву хгрупповое описание диффузии нейтронов.
    Notes: Abstract The neutron density in the vicinity of a black cylindrical rod partly inserted in a bare reactor is calculated and illustrated by a numerical example. The starting point is a two-group diffusion theory approximation. While the dependence of the effect of the rod on the insertion depth can be calculated simply by means of perturbation theory, the question of the neutron density estimate in the vicinity of the rod is considerably more difficult and in some considerations the estimate of the neutron density caused by the presence of the rod is indispensable. The method makes it possible to determine the reactivity value of the rod in dependence on the insertion depth and especially the neutron density deformation in the vicinity of the rod.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01689934
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  • 9
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    Electrical characterization of fluorinated benzothiadiazole based conjugated copolymer – a promising material for high-performance solar cells (2015)
    American Institute of Physics
    Details
    Publication Date: 2015-12-01
    Electronic ISSN: 2158-3226
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    The effect of a partially inserted absorbing control rod on the neutron flux density distribution (1961)
    Springer
    Details
    Publication Date: 1961-10-01
    Print ISSN: 1063-4258
    Electronic ISSN: 1573-8205
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Published by Springer
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