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  • 1
    Monograph available for loan
    Monograph available for loan
    Metodičeskie podchody k ispol'zovaniju biologičeskich indikatorov v paleoėkologii (2011)
    Kazan' : Kazanskij Universitet
    Details Availability
    Call number: AWI Bio-12-0024
    Description / Table of Contents: The book contains methodical overview of the main groups of biological indicators used in palaeoecology: pollen, diatoms, chironomids larvae, cladocera, ostracods, sponges, some other less widely used groups of invertebrates and a review on application of pedohumic method for palaeoecological reconstructions. Articles contain information on systematics, morphology, biology of the selected proxy groups and the modern approaches to palaeoclimatic reconstructions. Applicability of the biological indicators is illustrated by case studies from different regions: steppe Altay and Altay mountains, central and northern Yakutia, Northern Ural, west Siberia, lake Baikal, Tien Shan mountains, Middle Volga, etc. The book can be interesting for specialists in palaeoecology and students.
    Description / Table of Contents: В книге представлены методические обзоры по основным группам биологических индикаторов, применяемым в палеоэкологии: пыльца, диатомовые водоросли, личинки хирономид, ракообразные, остракоды, губки - и кратко охарактеризованы прочие группы беспозвоночных животных. В книгу также вошел обзор по применению педогумусового метода для палеоэкологических реконструкций. Обсуждаются современные подходы к использованию биологических индикаторов в качестве показателей палеоклиматических изменений и проблемные стороны проведения экологических и температурных реконструкций. Представлены примеры палеореконструкций, выполненных с применением различных индикаторных групп из различных регионов: Степной и Горный Алтай, Центральная и Северная Якутия, Северный Урал, Западная Сибирь, Байкал, Тянь-Шань, Среднее Поволжье и пр. Книга рассчитана на специалистов в области палеоэкологии и на студентов.
    Type of Medium: Monograph available for loan
    Pages: 278 Seiten , Illustrationen
    ISBN: 978-5-98180-934-7
    Language: Russian
    Note: СОДЕРЖАНИЕ Введение / (Л.Б. Назарова, Д.К. Нургалиев) Глава 1. Личинки хирономид (Diptera: Chironomidae) как индикаторы палеоклиматических изменений / (Л.Б. Назарова) Глава 2. Ветвистоусые ракообразные ( Cladocera Latreille, 1829, Branchiopoda, Crustacea) в палеоэкологических исследованиях / (Л.А. Фролова) Глава 3. Пресноводные остракоды и их применение в палеоэкологических исследованиях / (С . Веттерих, К. Зиrерт) Глава 4. Губки (Porifera, Spongia) в палеолимнолоrических исследованиях / (Е . Вейнберr) Глава 5. Водные беспозвоночные в палеолимнолоrии / (Л.Б . Назарова, О.Н. Туманов, Р.М. Сабиров) Глава 6. Палинологический анализ / (Н.А. Рудая) Глава 7. Использование метода диатомового анализа в палеолимнологических исследованиях / (О.В. Палагушкина, Л.А. Пестрякова) Глава 8. Диагностика и реконструкция палеоэкологических условий педогумусовым методом / (М.И. Дергачева) Заключение (Л.Б. Назарова, Д.К. Нургалиев) Литература Summary , In kyrillischer Schrift
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
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    Coulomb-Driven Energy Boost of Heavy Ions for Laser-Plasma Acceleration (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-03-27
    Description: Author(s): J. Braenzel, A. A. Andreev, K. Platonov, M. Klingsporn, L. Ehrentraut, W. Sandner, and M. Schnürer An unprecedented increase of kinetic energy of laser accelerated heavy ions is demonstrated. Ultrathin gold foils have been irradiated by an ultrashort laser pulse at a peak intensity of 8×10 19   W/  cm 2 . Highly charged gold ions with kinetic energies up to 〉200  MeV and a bandwidth limited energy... [Phys. Rev. Lett. 114, 124801] Published Thu Mar 26, 2015
    Keywords: Plasma and Beam Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Tracing dynamics of laser-induced fields on ultrathin foils using complementary imaging with streak deflectometry (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-09-09
    Description: Author(s): F. Abicht, J. Braenzel, G. Priebe, Ch. Koschitzki, A. A. Andreev, P. V. Nickles, W. Sander, and M. Schnürer We present a detailed study of the electric and magnetic fields, which are created on plasma vacuum interfaces as a result of highly intense laser-matter interactions. For the field generation ultrathin polymer foils (30–50 nm) were irradiated with high intensity femtosecond ( 10 19 – 10 20     W / cm 2 ) and p… [Phys. Rev. Accel. Beams 19, 091302] Published Thu Sep 08, 2016
    Keywords: New Acceleration Techniques
    Electronic ISSN: 1098-4402
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Effective post-acceleration of ion bunches in foils irradiated by ultra-intense laser pulses (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-15
    Description: Two-step laser acceleration of protons with two foils and two laser pulses is modelled and optimized. It is shown that a nearly mono-energetic distribution of proton bunches can be realized by a suitable parameter choice. Two-step acceleration schemes make it possible to obtain both higher efficiency and energy as compared to the acceleration with only one laser pulse of an energy equal to the sum of the energy of the two pulses. With the aid of our analytical model, the optimal distance between the two targets, the delay between the two laser pulses, and the parameters of the laser pulses are determined. Estimates and results of the modelling are proven with 2D PIC simulations of the acceleration of proton bunches moving through the second target.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    2.8 million years of Arctic climate change from Lake El'gygytgyn, NE Russia (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-06-23
    Description: The reliability of Arctic climate predictions is currently hampered by insufficient knowledge of natural climate variability in the past. A sediment core from Lake El'gygytgyn in northeastern (NE) Russia provides a continuous, high-resolution record from the Arctic, spanning the past 2.8 million years. This core reveals numerous "super interglacials" during the Quaternary; for marine benthic isotope stages (MIS) 11c and 31, maximum summer temperatures and annual precipitation values are ~4 degrees to 5 degrees C and ~300 millimeters higher than those of MIS 1 and 5e. Climate simulations show that these extreme warm conditions are difficult to explain with greenhouse gas and astronomical forcing alone, implying the importance of amplifying feedbacks and far field influences. The timing of Arctic warming relative to West Antarctic Ice Sheet retreats implies strong interhemispheric climate connectivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Melles, Martin -- Brigham-Grette, Julie -- Minyuk, Pavel S -- Nowaczyk, Norbert R -- Wennrich, Volker -- DeConto, Robert M -- Anderson, Patricia M -- Andreev, Andrei A -- Coletti, Anthony -- Cook, Timothy L -- Haltia-Hovi, Eeva -- Kukkonen, Maaret -- Lozhkin, Anatoli V -- Rosen, Peter -- Tarasov, Pavel -- Vogel, Hendrik -- Wagner, Bernd -- New York, N.Y. -- Science. 2012 Jul 20;337(6092):315-20. doi: 10.1126/science.1222135. Epub 2012 Jun 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Strasse 49a, D-50674 Cologne, Germany. mmelles@uni-koeln.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22722254" target="_blank"〉PubMed〈/a〉
    Keywords: Arctic Regions ; *Climate Change ; *Cold Climate ; Geologic Sediments ; Ice Cover ; *Lakes ; Radiometric Dating ; Russia ; Time Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Tracing ultrafast dynamics of strong fields at plasma-vacuum interfaces with longitudinal proton probing (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-07-23
    Description: If regions of localized strong fields at plasma-vacuum interfaces are probed longitudinally with laser accelerated proton beams their velocity distribution changes sensitively and very fast. Its measured variations provide indirectly a higher temporal resolution as deduced from deflection geometries which rely on the explicit temporal resolution of the proton beam at the position of the object to probe. With help of reasonable models and comparative measurements changes of proton velocity can trace the field dynamics even at femtosecond time scale. In longitudinal probing, the very low longitudinal emittance together with a broad band kinetic energy distribution of laser accelerated protons is the essential prerequisite of the method. With a combination of energy and one-dimensional spatial resolution, we resolve fast field changes down to 100 fs. The used pump probe setup extends previous schemes and allows discriminating simultaneously between electric and magnetic fields in their temporal evolution.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Stable laser-ion acceleration in the light sail regime (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-01-31
    Description: Author(s): S. Steinke, P. Hilz, M. Schnürer, G. Priebe, J. Bränzel, F. Abicht, D. Kiefer, C. Kreuzer, T. Ostermayr, J. Schreiber, A. A. Andreev, T. P. Yu, A. Pukhov, and W. Sandner We present experimental results on ion acceleration with circularly polarized, ultrahigh contrast laser pulses focused to peak intensities of 5×10 19   W cm -2 onto polymer targets of a few 10 nanometer thickness. We observed spatially and energetically separated protons and carbon ions that accumulate... [Phys. Rev. ST Accel. Beams 16, 011303] Published Wed Jan 30, 2013
    Keywords: New Acceleration Techniques
    Electronic ISSN: 1098-4402
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Amplification of Relativistic Electron Bunches by Acceleration in Laser Fields (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-01-12
    Description: Author(s): J. Braenzel, A. A. Andreev, F. Abicht, L. Ehrentraut, K. Platonov, and M. Schnürer Direct acceleration of electrons in a coherent, intense light field is revealed by a remarkable increase of the electron number in the MeV energy range. Laser irradiation of thin polymer foils with a peak intensity of ∼ 1 × 10 20     W / cm 2 releases electron bunches along the laser propagation direction tha… [Phys. Rev. Lett. 118, 014801] Published Thu Jan 05, 2017
    Keywords: Plasma and Beam Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 9
    Electronic Resource
    Electronic Resource
    Waveguide propagation of intense electromagnetic radiation in slightly inhomogeneous nonlinear media (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 3 (1993), S. 107-115 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of self-localizing beams of electromagnetic waves in the form of nonlinear waveguides in a slightly inhomogeneous medium is studied analytically and numerically. The trajectories of the axial ray are studied as a function of its direction and the field strength at the initial point on the basis of a nonlinear scalar Helmholtz equation. Analytic expressions are derived. The longitudinal refractive index, the field intensity, and the waveguide radius are plotted as functions of the instantaneous position of the point on the axial ray. Deep penetration of the beam into the opaque region and the position of the screening surface are studied as functions of the parameters of the beam and the medium. A steady-state 3D problem is analyzed for a power-law nonlinearity with an arbitrary power. A 2D problem is analyzed for the case of a ponderomotive nonlinearity with saturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.165972
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  • 10
    Electronic Resource
    Electronic Resource
    Backscattering of ultrashort high intensity laser pulses from solid targets at oblique incidence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 581-588 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Backreflection of short, intense laser pulses at oblique incidence on solid targets is explained with a model where a periodic electron density modulation acts as a diffraction grating. The pump and reflected electromagnetic waves drive through the ponderomotive force the grating, and the coupled system becomes parametrically unstable. The basic equations governing this situation are given. A linearized stability analysis is used to obtain the instability growth rate in a homogeneous plasma and the convective gain coefficients for the inhomogeneous case. The results support the feasibility of the suggested mechanism. An absolute instability is predicted to set on at a threshold intensity of about 1016 W/cm2 for a typical laser pulse with a length of 100 fs and a spot size of 30 μm. The instability is shown to saturate at a level of a few percent, because the higher harmonics in the electron density modulation make the diffraction more diffuse, thus reducing both the ponderomotive force and the backreflection coefficient. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1423620
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