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    Tytuł:
    Considerations on Energy Deposition with the BAM-Fallhammer
    Autorzy:
    Von Oertzen, A.
    Lehmann, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358904.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    explosives
    impact sensitivity
    BAM-Fallhammer
    quality control
    Opis:
    The BAM-Fallhammer is a mechanical device to test the impact sensitivity of explosives and to determine a sensitiveness level. By its construction it transforms potential energy into kinetic energy of an impacting hammer, then hitting the sample. Ideally the entire potential energy is available at the moment of impact and the supporting base is infinitely rigid. By this study we want to quantify how much a real Fallhammer deviates from the ideal concept, and what the differences between different Fallhammers in different laboratories are. This information has never been collected in a consistent way. The aim of the authors is to develop guidance on the mechanical properties of the Fallhammer, which can be used for different purposes such as internal quality control, validation of the correct functioning of the Fallhammer, preparation of Round-Robin tests and similar. An established and verified mechanical status of a Fallhammer would greatly improve the quality and comparability of results and Round-Robin tests on the impact sensitivity of explosives.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 2; 273-288
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany aktywności dehydrogenazy glutaminianowej (GDH) w odpowiedzi na głodzenie węglowodanowe i obecność metali ciężkich
    Autorzy:
    Lehmann, T.
    Kramarska, P.
    Smolag, J.
    Ratajczak, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/801658.pdf
    Data publikacji:
    2002
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    Celem pracy było porównanie wpływu cukru i metali ciężkich (kadmu i ołowiu) na aktywność oraz spektrum form molekularnych dehydrogenazy glutaminianowej (GDH). Doświadczenia przeprowadzono na izolowanych osiach zarodkowych łubinu żółtego, rosnących w kulturze in vitro (48 godz.). Stosowano dwa warianty hodowlane: pożywka Heller'a z sacharozą (tzw. „osie odżywione") i pożywka Heller'a bez sacharozy (tzw „osie głodzone). Oba warianty traktowano jonami kadmu i ołowiu. Oznaczenia aktywności NADH-GDH (aminacyjnej) i NAD-GDH (dezaminacyjnej) wykazały, że cukier wyraźnie hamuje aktywność enzymu w stosunku do wariantu głodzonego. Potraktowanie osi jonami zarówno kadmu, jak i ołowiu indukowało w osiach odżywionych głównie aktywność NADH-GDH, zaś w osiach głodzonych wzrastała aktywność NAD-GDH. Analizy elektroforetyczne wykazały, ż w obecności cukru następowała redukcja spektrum izoenzymatycznego GDH z ok. 22 form (osie głodzone) do ok. 14 from (osie odżywione). Izoenzymy te były indukowane ponownie w osiach odżywionych po dodaniu do pożywki kadmu lub ołowiu. W osiach głodzonych efektem obu metali były zmiany w intensywności wybarwienia poszczególnych izoenzymow. Uzyskane wyniki omawiane są w oparciu o mechanizm represji katabolicznej powodowanej przez cukier.
    Embryos of lupine (Lupinus luteus L.) deprived of cotyledons were cultured for 48 h in Heller medium with or without sucrose. Cd and Pb stress were imposed by adding Cd(SO₄)₂ and Pb(NO₃)₂ to the nutrient solutions at various concentrations. The metal's effects on the glutamate dehydrogenase activity (GDH) were analysed in comparison to trophic conditions. Sucrose starvation of embryos increased the total activity of GDH as well as the isoenzyme pattern. Some isoenzymes were negatively affected by catabolic repression and induced by carbon starvation. Repression affected mainly the more cathodic bands which were predominant in non-repressed conditions. Exposure of sucrose fed (+ S) and sucrose starved (-S) embryos to Cd and Pb treatment increased significantly the total activity of GDH (aminating and deaminating activities, NADH-GDH and NAD-GDH respectively). Additions of metals to sucrose fed (+S) embryos resulted in a marked enhancement of activity of cathodal isoenzymes of GDH. There were no significant changes in the number of isoenzymes between sucrose starved (-S) embryos treated either with Cd or Pb. The possible physiological role of GDH in regulation of metabolism of lupine embryos under stress conditions is disscused.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 2002, 481, 2
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of suboptimal nutrient conditions on nitrogen, photosynthetic and symbiotic status of mycorrhized maize
    Autorzy:
    Paluch, E.
    Polcyn, W.
    Lehmann, T.
    Scierzynska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/80979.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    arbuscular mycorrhizal fungi
    nutrient
    nitrogen
    maize plant
    photosynthesis
    growth condition
    mycorrhizal fungi
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Putrescine catabolism via DAO contributes to proline and GABA accumulation in roots of lupine seedlings growing under salt stress
    Autorzy:
    Legocka, J.
    Sobieszczuk-Nowicka, E.
    Ludwicki, D.
    Lehmann, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/57527.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    The levels of polyamines (PAs), proline (Pro), and γ-aminobutyric acid (GABA) as well as the activity of diamine oxidase (DAO; EC 1.4.3.6) were studied in the roots of 2-day-old lupine (Lupinus luteus L. ‘Juno’) seedlings treated with 200 mM NaCl for 24 h. The effect of adding 1 mM aminoguanidine (AG), an inhibitor of DAO activity, was also analyzed. It was found that in roots of lupine seedlings growing under salt stress, a negative correlation between Pro accumulation and putrescine (Put) content takes place. Pro level increased in roots by about 160% and, at the same time, Put content decreased by about 60%, as a result of ca. twofold increase of DAO activity. The AG added to the seedlings almost totally inhibited the activity of DAO, increased Put accumulation to control level, decreased Pro content by about 25%, and reduced GABA level by about 22%. Addition of 50 mM GABA to the lupine seedlings growing in the presence of AG and NaCl restored Pro content in roots to its level in NaCl-treated plants. In this research, the clear correlation between Put degradation and GABA and Pro accumulation was shown for the first time in the roots of seedlings growing under salt stress. This could be considered as a short-term response of a plant to high salt concentration. Our findings indicate that during intensive Pro accumulation in roots induced by salt stress, the pool of this amino acid is indirectly supported by GABA production as a result of Put degradation.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2017, 86, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Induced Drag of Charge Carriers in Heterostructures in Magnetic Fields: Limit of Weak Fields
    Autorzy:
    Jasiukiewicz, Cz.
    Lehmann, D.
    Paszkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950859.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    73.40.-c
    Opis:
    The response of a 2D gas of charge carriers of mobility μ in magnetic field B to pulsed phonon beams is considered. Previously we derived a quantum Langevin equation for the centre-of-mass of the carrier gas, which allows us to calculate the time integrated drag current. This formula is studied in the weak magnetic field limit. When the ratio of the cyclotron frequency ω$\text{}_{c}$ to the frequency ω of phonons is small and μB ≪ 1, the general formula coincides with the corresponding expression obtained in the frame of the Boltzmann equation with the collision integral independent of B.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 829-832
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Images of the Response Signal of a 2D Gas of Carriers to a Pulsed Beam of 3D Phonons
    Autorzy:
    Jasiukiewicz, Cz.
    Lehmann, D.
    Paszkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929698.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    66.70.+f
    73.40.Lq
    Opis:
    The patterns for the time integrated drag current induced by a pulsed beam of bulk phonons in a 2D gas of charge carriers are calculated. A beam of Planckian phonons propagates in a GaAs crystal. We considered a 2D gas of electrons lying in a {001} plane and a 2D gas of holes lying in the {311} plane. Planckian phonons are radiated by an extended (Gaussian) source.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 661-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Field Dependence of Phonon-Induced Drag Current of 2D Carriers
    Autorzy:
    Lehmann, D.
    Jasiukiewicz, Cz.
    Paszkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968318.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    73.40.-c
    Opis:
    The magnetic field dependence of the drag current induced by beams of acoustic phonons is studied in a 2D gas of carriers, formed in a heterostructure. This drag current is related to the velocity of the center of mass of the gas. The elimination of the degrees of freedom related to the relative motion of the carriers leads to a Langevin equation for the center-of-mass position vector. From this equation one can obtain an expression for the induced current density which depends on carrier density-density correlation functions. An explicit formula for the time-integrated current density is derived taking into account all intra and inter Landau level transitions. Corresponding numerical results are in good agreement with the experimental patterns.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 891-894
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Microscopy and Tomography
    Autorzy:
    Butz, T.
    Lehmann, D.
    Reinert, T.
    Spemann, D.
    Vogt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028912.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.75.Ak
    72.20.My
    29.30.Kv
    Opis:
    The use of light ions for microscopy and tomography is illustrated by a variety of recent applications in materials and life sciences at the Leipzig high-energy ion-nanoprobe LIPSION with a short comparison to other microscopic techniques. The versatility of ion techniques is exemplified by Rutherford backscattering spectrometry maps of thin films of solar cell materials, particle induced X-ray emission maps of manganese in ancient human bones, particle induced X-ray emission on single aerosol particles withμm size, and scanning transmission ion microscopy and tomography on pigs knee cartilage. Finally, the design of a single ion single living cell bombardment facility is sketched for studies of the cellular response and microdosimetry.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 603-613
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Aptian bay deposits at the southern margin of the Lower Saxony Basin : Integrated stratigraphy, palaeoenvironment and OAE 1a
    Autorzy:
    Lehmann, J.
    Friedrich, O.
    Bargen, D.
    Hemker, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/138789.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    APT
    biostratygrafia
    chemostratygrafia
    facja
    Niemcy
    kreda wczesna
    Aptian
    biostratigraphy
    chemostratigraphy
    Early Cretaceous
    facies
    NW Germany
    OAE 1a
    Opis:
    The present study establishes a lithostratigraphic subdivision, a bio- and chemostratigraphy and describes the sedimentology of the Alstatte Bay at the southern margin of the Lower Saxony Basin in northern Germany. The socalled Fischschiefer is developed in the lower part of the section, a 2.1 m thick laminated interval that shows TOC values of up to 2 % and is interpreted as local expression of the global Oceanic Anoxic Event 1a (OAE 1a). The basal part of the Fischschiefer is fairly continuously laminated, whereas its upper part is characterized by an alternation of laminated and non-laminated beds. Stable carbon isotopes ([delta^13]C[carb]) show a characteristic pattern for the Fischschiefer interval that can be correlated with sections from the Tethyan Realm. Immediately above the Fischschiefer, however, the studied section might reveal a diagenetic overprint as indicated by very negative carbon stable isotope values. The remaining part of the section is characterized by a rather monotonous claystone succession, terminated by a greenish layer rich in glauconite overlain by glacial till of Pleistocene age. The fauna is typically Boreal in the lower part of the section, but changes around 2 m above the Fischschiefer towards an assemblage indicating a distinct Tethyan influx. The faunal shift is considered to be due to the maximum flooding of the continuous, long-term sea level rise of the Early Aptian which led also to a supposed shift from a restricted to open bay environment.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 1; 35-62
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Properties of Co Thin Films on Au(111) Substrates
    Autorzy:
    Walczak, A.
    Ślusarski, T.
    Lehmann-Szweykowska, A.
    Kamieniarz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489873.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.35.-p
    Opis:
    The structural and magnetic properties of thin Co films grown on Au(111) substrates are investigated using ab initio local-spin-density calculations in the generalized gradient approximation. It is shown that a large lattice intermismatch between Co and Au(111) leads to a strong contraction of the interlayer distances within the Co layer, which adopts either the hexagonal close-packed (α-phase) or the face-centered cubic (β-phase) structure of bulk Co. Magnetic moments in the Co layer are increased beyond their value in bulk Co, the enhancement being strongest at the free surface and at the Co/Au interface, and more modest in the central part of the adlayer. Moderating influence of capping Ag layers on the structure and the magnetic properties of the films has also been considered. It is shown that Ag capping reduces the magnetic moments in comparison to uncovered Co/Au systems.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 653-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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