104 research outputs found
Atlas aérien d'Autriche : Luftbild Atlas Österreich, Eine Landeskunde mit 80 farbigen Luftaufnahmen, de L. Beckel, H. Fischer, F. Julg et Karl Scheidl
No full textLéger Michel. Atlas aérien d'Autriche : Luftbild Atlas Österreich, Eine Landeskunde mit 80 farbigen Luftaufnahmen, de L. Beckel, H. Fischer, F. Julg et Karl Scheidl. In: Annales de Géographie, t. 80, n°439, 1971. p. 370
Static elasticity of cordierite II: effect of molecular channel constituents on the compressibility
No full textTwo natural CO2-rich cordierite samples (1.00 wt% CO2, 0.38 wt% H2O, and 1.65 wt% CO2, 0.15 wt% H2O, respectively) were investigated by means of Raman spectroscopy and single-crystal X-ray diffraction at ambient and high pressures. The effect of heavy-ion irradiation (Au 2.2 GeV, fluence of 1 × 1012 ions cm-2) on the crystal structure was investigated to characterize the structural alterations complementary to results reported on hydrous cordierite. The linear CO2 molecules sustained irradiation-induced breakdown with small CO2-to-CO conversion rates in contrast to the distinct loss of channel H2O. The maximum CO2 depletion rate corresponds to ~12 ± 5 % (i.e. ~0.87 and ~1.49 wt% CO2 according to the two samples, respectively). The elastic properties of CO2-rich cordierite reveal stiffening due to the CO2 molecules (non-irradiated: isothermal bulk modulus K0 = 120.3 ± 3.7 GPa, irradiated: K0 = 109.7 ± 3.7 GPa), but show the equivalent effect of hydrous cordierite to get softer when irradiated. The degree of anisotropy of axial compressibilities and the anomalous elastic softening at increasing pressure agrees with those reported for hydrous cordierite. Nevertheless, the experimental high-pressure measurements using ethanol-methanol reveal a small hysteresis between compression and decompression, together with the noticeable effect of pressure-induced over-hydration at pressures between 4 and 5 GPa
The effect of diacylglycerols on fibronectin release and its reversal by retinoic acid in cell culture
No full textPrevious work from our laboratory showed that tumor promoters such as phorbol ester (TPA) stimulated the release of fibronectin (FN) from the surface of several cell types in culture, and that this stimulation was counteracted by retinoic acid. Diacylglycerols (DAGs) are the endogenous ligands of the TPA receptor and can activate and translocate protein kinase C (PKC) in a manner similar to TPA. To show that the release of FN is related to activation of PKC, we tested the action of DAGs on FN release from human lung fibroblasts and its counteraction by retinoic acid. We found that DAGs stimulated the release of FN in a concentration-and time-dependent manner. The stimulation of the release of FN correlated with the translocation-activation of PKC by DAG. Retinoic acid reversed the action of DAG with respect to stimulation of FN release and inhibited this release even in the absence of DAG. These results suggest that the release of FN is in some way related to translocation-activation of PKC
Static elasticity of cordierite I: Effect of heavy ion irradiation on the compressibility of hydrous cordierite
No full textThe effect of ion beam irradiations on the elastic properties of hydrous cordierite was investigated by means of Raman and X-ray diffraction experiments. Oriented single crystals were exposed to swift heavy ions (Au, Bi) of various specific energies (10.0-11.1 MeV/u and 80 MeV/u), applying fluences up to 5 × 1013 ions/cm2. The determination of unit-cell constants yields a volume strain of 3.4 × 10-3 up to the maximum fluence, which corresponds to a compression of non-irradiated cordierite at ~480 ± 10 MPa. The unit-cell contraction is anisotropic (e1 = 1.4 ± 0.1 × 10-3, e2 = 1.5 ± 0.1 × 10-3, and e3 = 7 ± 1 × 10-4) with the c-axis to shrink only half as much as the axes within the ab-plane. The lattice elasticity for irradiated cordierite (φ{symbol} = 1 × 1012 ions/cm2) was determined from single-crystal XRD measurements in the diamond anvil cell. The fitted third-order Birch-Murnaghan equation-of-state parameters of irradiated cordierite (V0 = 1548.41 ± 0.16 Å3, K0 = 117.1 ± 1.1 GPa, ∂K/∂P = -0.6 ± 0.3) reveal a 10-11 % higher compressibility compared to non-irradiated cordierite. While the higher compressibility is attributed to the previously reported irradiation-induced loss of extra-framework H2O, the anomalous elasticity as expressed by elastic softening (β a-1, β b-1, β c-1 = 397 ± 9, 395 ± 28, 308 ± 11 GPa, ∂(β-1)/∂P = -4.5 ± 2.7, -6.6 ± 8.4, -5.4 ± 3.0) appears to be related to the framework stability and to be independent of the water content in the channels and thus of the ion beam exposure
High-pressure behavior and crystal-fluid interaction under extreme conditions in paulingite [PAU-topology]
No full textThe compressional behavior and the P-induced crystal-fluid interaction of a natural paulingite-K have been explored on the basis of in-situ single-crystal and powder X-ray diffraction, and in-situ single-crystal Raman spectroscopy with a diamond anvil cell and a series of diverse pressure-transmitting fluids (i.e., silicone-oil, methanol:ethanol = 4:1, methanol:ethanol:water = 16:3:1). No evidence of any phase transition was observed within the P-range investigated, independent on the used P-fluids. The compressional behavior of paulingite is significantly different in response to the different nature of the P-fluids. A drastically lower compressibility is observed when the zeolite is compressed in methanol:ethanol or, even more noticeably, in methanol:ethanol:water mix. We ascribe this phenomenon to the different crystal-fluid interaction at high pressure: (1) silicone-oil is a "non-penetrating" P-medium, because of its polymeric nature, whereas (2) methanol-ethanol and water are "penetrating" P-fluids. The P-induced penetration processes appear to be completely reversible on the basis of the X-ray diffraction data alone. The Raman spectra collected after the high-pressure experiments show, unambiguously, that a residual fraction of methanol (and/or ethanol and probably even extra H2O) still resides in the zeolitic sub-nanocavities; such molecules are spontaneously released after a few days at atmospheric pressure. The actual compressibility of paulingite-K is that obtained by the compression experiment in silicone-oil, with an isothermal bulk modulus K0 = β0-1 = 18.0(1.1) GPa. Paulingite appears to be one of the softest zeolite ever found
USE OF SHADOW PUPPETRY FOR STAGING/DRAMATIZATION OF A STORY
No full textV diplomskem delu z naslovom Dramatizacija zgodbe s senčnimi lutkami je predstavljeno projektno vzgojno delo v oddelku otrok, starih od 4—5 let.
V teoretičnem delu diplomske naloge je na podlagi strokovne literature opisano senčno gledališče, senčne lutke, lutkovna dramatizacija, dramatizacija zgodbe, lutka — idealna povezava didaktičnih smotrov ter projektno delo.
Namen praktičnega dela je bil, da otroke seznanimo s senčnimi lutkami in njihovo izdelavo, s katerimi na koncu izdelamo dramatizacijo. Podrobno je opisan potek projekta, ki vsebuje tri priprave, in sicer spoznavanje senčnih lutk, izdelavo senčne lutke in dramatizacijo zgodbe s temi lutkami. Projektno delo smo izvedli v oddelku otrok starih od 4 do 5 let Vrtca Šentjur. Pri samem projektu pa nam je za literarno predlogo služila zgodbica Škoržek, avtorice Gerde Marie Scheidl.In my diploma paper Use of shadow puppetry for staging / dramatization of a story an educational project work with 4-5- year- old- children is presented.
Theoretical background describes shadow theatre, shadow puppets, puppet dramatization, dramatization of a story, a puppet as an ideal connection of didactic aims, and project work.
The purpose of the practical part was to make known children with shadow puppets, their making and dramatization with them. There is described a process of the project, which consists of getting to know the shadow puppets, making the shadow puppet and dramatizing the story with these puppets.The project work was carried out with 4-5- year- old- children in kindergarten Šentjur. We used the story Škoržek whose author is Gerde Marie Scheidl
Free-space quantum key distribution over 144 km
No full textWe report on the experimental implementation of a BB84-type quantum key distribution protocol over a 144 km free-space link using weak coherent laser pulses. The security was assured by employing decoy state analysis, and optimization of the link transmission was achieved with bi-directional active telescope tracking. This enabled us to distribute a secure key at a rate of 11 bits/s at an attenuation of about 35 dB. Utilizing a simple transmitter setup and an optical ground station capable of tracking spacecraft in low earth orbit, this outdoor experiment demonstrates the feasibility of global key distribution via satellites
Entanglement-based quantum communication over 144km
No full textQuantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of classical communication and computation. In view of applications such as quantum cryptography or quantum teleportation, extension of quantum-entanglement-based protocols to global distances is of considerable practical interest. Here we experimentally demonstrate entanglement-based quantum key distribution over 144km. One photon is measured locally at the Canary Island of La Palma, whereas the other is sent over an optical free-space link to Tenerife, where the Optical Ground Station of the European Space Agency acts as the receiver. This exceeds previous free-space experiments by more than an order of magnitude in distance, and is an essential step towards future satellite-based quantum communication and experimental tests on quantum physics in space
Bond-disordered spin systems: Theory and application to doped high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>compounds
No full textWe examine the stability of magnetic order in a classical Heisenberg model with quenched random exchange couplings. This system represents the spin degrees of freedom in high-T-c compounds with immobile dopants. Starting from a replica representation of the nonlinear-sigma model, we perform a renormalization-group analysis. The importance of cumulants of the disorder distribution to arbitrarily high orders necessitates a functional renormalization scheme. From the renormalization flow equations we determine the magnetic correlation length numerically as a function of the impurity concentration and temperature. From our analysis it follows that two-dimensional layers can be magnetically ordered for arbitrarily strong but sufficiently diluted defects. We further consider the dimensional crossover in a stack of weakly coupled layers. The resulting phase diagram is compared with experimental data for La2-xSrxCuO4.</p
Space-quest, experiments with quantum entanglement in space
No full textThe European Space Agency (ESA) has supported a range of studies in the field of quantum physics and quantum information science in space for several years, and consequently we have submitted the mission proposal Space-QUEST (Quantum Entanglement for Space Experiments) to the European Life and Physical Sciences in Space Program. We propose to perform space-to-ground quantum communication tests from the International Space Station (ISS). We present the proposed experiments in space as well as the design of a space based quantum communication payload
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