Ausbildungsprogramm Wet DAV BW Wettkampf Seit ist für die Teilnahme an allen BaWü Jugendcups und den Meisterschaftswettkämpfen. Raich, H. Engländer. Innsbruck, Juni . Die konsequente Ausbildung von Sektionsfunkti-. onärInnen OeAV und DAV sowie AVS (Alpenverein Südtirol). Wanderprogramm – Alpenverein Burghausen. from erein. . Ausbildungsprogramm DAV-Burghausen – Alpenverein.
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New materials, suitable for the application in reversed phase liquid chromatography and fuel cell membranes, were characterized regarding their structure and dynamic properties using solid-state and suspended-state NMR spectroscopy.
Both methods were found to be suitable to study the dynamic behaviour, the first to observe intrinsic mobilities of phosphonic acids, the second to monitor interaction processes taking place in a chromatography-like system. Several phosphonic acids, which are promising materials for high temperature fuel cell membranes, were investigated with respect to proton mobility and transport applying various solid-state NMR methods.
In addition, water uptake and its effects on anhydride formation were studied on samples that were equilibrated with ausbildungspdogramm salt solutions. These results show that the relation between hydrogen bond strength and proton mobility is complex.
Stationary ausbildungsprogranm for reversed phase liquid chomatography were characterized by solid-state NMR spectroscopy, and their influence on different analytes was studied using suspendedstate HR-MAS NMR spectroscopy. For this, the stationary phase was suspended in a solution of analyte dissolved in mobile phase.
MePhSucc showed a peak doubling of the CH2 group in presence of monomeric C18 phase, leading to the coexistence of a narrow and a broadened peak. Changing the mobile phase concentration and composition caused a shift of the broadened peak towards the narrow CH2 213, resulting in the fusion of both.
These effects were explained by two different theories, one of which substantiates with polarity differences, the other with the winding up of the C18 alkyl chains. The obtained data proved superiority of the respective MIP over the NIP, and definite knowledge of the interaction site at the analyte molecules could be gained. Differences between specific and non-specific binding could be observed.
Ein neuer Ansatz fuer die Charakterisierung von Mammatumoren. Klinik und Poliklinik fuer Radiologie; Muehler, A. The value of macromolecular contrast agents MMCM for the characterization of benign and malignant breast tumors will be demonstrated in this review. The concept of tumor differentiation is based on the pathological hyperpermeability of microvessels in malignant tumors.
MMCM show a leak into the interstitium of ausbildungsprogamm, whereas ausbildugsprogramm are confined to the intravascular space in benign tumors.
Capabilities and limitations of the MMCM-prototype. Das Potential von Blood-pool-Eisenoxidpraeparaten, z. AMI, fuer die Bestimmung von. Processes and materials for photovoltaic applications. Workshop; Verfahren und Materialien fuer die Photovoltaik.
Solar energy will surely continue to be the most important renewable energy source. Sincesolar cell production has doubled every five years while the per unit price decreased continuously. This trend is expected to continue. Germany made important contributions ausbildunbsprogramm in the construction of new solar cell production plants and in the development of new PV materials and material combinations, as well as in technology and PV plant construction. The states of Thuringia and Saxony were significant contributors.
In Thuringia, two solar cell production plants were constructed, while Saxon vacuum coating technology was used in nearly all new German production plants. This workshop presented the activities in Thuringia in Saxony. aisbildungsprogramm
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Contacts were to be established between partners from industry and research, joint projects were to be initiated, and society and politicians were to be informed on the success and new chances achieved.
Seit verdoppelt sich die Solarzellenproduktion in jeweils fuenf Jahren, gleichzeitig sank der Preis pro Leistungseinheit kontinuierlich. Dieser Trend wird weiter anhalten.
Deutschland leistete in den letzten Jahren wichtige Beitraege zu dieser Entwicklung, sowohl beim Aufbau neuer Fertigungskapazitaeten fuer Solarzellen, als auch bei der Entwicklung neuer Photovoltaik- Materialien bzw. Der Anteil Thueringens und Sachsens an dieser positiven Entwicklung ist groesser als generell vermutet. In Thueringen entstanden zwei Unternehmen fuer die Solarzellenproduktion, der saechsische Vakuumbeschichtungs-Anlagenbau war am Aufbau fast aller neuen deutschen Fertigungsstaetten beteiligt.
Auf dem Workshop werden. Synthesis and characterization of new oxides and oxynitrides of niobium; Synthese und Charakterisierung neuer Oxide und Oxidnitride des Niobs. By different synthesis routes the first oxide nitrides in the series scandium-niobium-oxygen-nitrogen could be synthesized and characterized. UV-Vis measurements point to a band gap of 3. In the series zirconium-niobium-oxygen-nitrogen new oxides and oxide nitrides could be synthesized. By replacing zirconium with hafnium isotopical compounds with comparable composition could be obtained.
The crystal structure of these new compounds is discussed respecting magnetism and the results of electron microscopy and neutron diffraction. Characterization of solar cells. New techniques with high spatial resolution; Entwicklung neuer Verfahren zur raeumlich hochaufloesenden Charakterisierung von Solarzellen.
A change to regenerative forms of energy is an important and inevitable step in order to face the challenges of climate change and fading natural resources.
Photovoltaic’s PV plays a special role within the various forms of renewable energy since it converts sunlight, our most important and virtually endless energy source, directly into electricity.
However, currently available PV-systems are still very expensive and, in combination with their relatively low performance, can hardly or cannot compete with conventional sources of energy from an economical point of view.
One possibility to overcome this problem is the combination of highly efficient multi junction solar cells with cost-efficient concentrator optics that focus the incident sunlight to a small spot. The material system GaIn NAs is envisioned to play an important role in a future generation of multi junction solar cells for concentrator applications being a further development of existing device concepts.
However, especially the carrier diffusion lengths in GaIn NAs -based solar cell layers are currently to low for the fabrication of highly efficient PV-structures. In this work, two novel techniques for the characterization of solar cells are developed and evaluated by experiments on test structures and numerical simulations.
Both are based on the measurement of laser-induced currents. Spatially-resolved photocurrent spectroscopy SRPS allows a spatially-resolved determination of locally induced photocurrents at a fixed bias voltage while spatially-resolved IV-characteristics SRIV are measurements of local I-V-characteristics at a certain position. Especially the local p-n-parameters of the sample become accessible.
These are the short circuit current, the saturation current, the ideality factor and the excitation-induced shunt resistance. The goal of these experiments was to improve the material quality of such structures by treating them with high electrical currents and strong lasers pulses. Such enhanced devices could be used in a future generation of PV-systems leading to a significantly increased efficiency.
Concerning this some first achievements were made. The use of high electrical currents led to a significant increase of the short circuit current, especially if applied as reverse bias.
However, this also caused a reduction of the shunt resistance which eventually dropped down to a few ohms. The application of intensive laser radiation led under certain conditions to a considerable ausbildungsprigramm of the carrier lifetime and photoluminescence but no improvement of ausbildkngsprogramm electrical properties of the devices could be found.
A second project dealt with the effect of carrier-depletion on the evaluation of data obtained by the variable stripe length method which is a technique for measuring the optical gain of potential laser materials. Numerical simulations and accompanying experiments on a GaAs-quantum well structure showed that this approach is only valid within a small parameter range.
Outside this ausbildungsrpogramm an unavoidable carrier depletion caused by stimulated emission processes leads to significant errors in the obtained results.
The determination ausbildungsrpogramm the corresponding borders is very complicated and requires a detailed knowledge of the sample properties.
As the variable stripe length method is typically used to get a first insight into the properties of a novel sample such knowledge is generally missing. Therefore the reliability of experimental results ausboldungsprogramm by this technique is doubtful. Characterization of materials for the conversion of sunlight to enhance the efficiency of solar cells; Charakterisierung von Materialien fuer die Konversion von Sonnenlicht zur Effizienzsteigerung von Solarzellen.
These losses can be reduced through the down- and up-conversion of the incoming sun light. A larger fraction of the solar spectrum can be used for electricity generation if the converted sun light is spectrally fitted to the spectral response of the solar cell.
In so doing, the efficiency of the solar cell increases. The maximal gain in the short circuit current density of a solar cell by the down-conversion of light within the spectral range of and nm to the visible spectral range amounts to 1. Using the spectral transfer eav formalism, the Ausbildungsprorgamm of amorphous thin film silicon solar cells with an ideal down-converter doped ausbildunngsprogramm the rare earth ions Tb and Eu is simulated.
Down-conversion in the spectral range up to nm results in a gain in QE. In this work, the down-conversion of the incoming sun light is investigated using the rare earth ions Tb and Eu within various glass matrices. These glass matrices include fluorozirconate FZ glasses, fluorochlorozirconate FCZ glasses, lithium ausbilrungsprogramm sodium borate glasses, and thin silica and alumina films.
Tb ions can be excited in the UV between and nm and emit the converted light in the visible spectral range between and nm, which is well suited to the spectral uasbildungsprogramm of amorphous thin film silicon solar cells. Eu ions can be excited in the UV of and nm and emits the converted light in the visible spectral range between and nm.
The materials investigated for down-conversion are optimized with regard to their conversion efficiency and were compared to a commercial fluorescence glass doped with the rare earth ion Tb.
Using photothermal deflection spectroscopy and classical transmission and reflection measurement, to determine the absorption of the down-converter, the internal conversion efficiency of the down-converter is determined. Decreasing the structure size, in which the rare earth ions are built, decreased the phonon energy of the matrix material, which leads to higher conversion efficiencies.
The highest internal conversion efficiency is observed in FCZ glass, in this material the rare earth ion Eu is incorporated into barium chloride nanocrystals. They corrode in contact with water. Sputtered silica and alumina films doped with the rare earth ion Tb, are optimized with regard to their photoluminescence intensity.
The photoluminescence intensity of Tb doped thin films with different layer thickness on different substrates are corrected using the software program CODE with regard to interference effects and optical properties. The influence of Tb concentration, matrix material, and thermal annealing at different temperatures on the photoluminescence intensity is investigated.
For up-conversion of the incoming sun light the rare earth ion Nd is investigated. Nd is implanted in quartz glass. The photoluminescence of Nd is investigated through down-conversion. The photoluminescence intensity is optimized through thermal annealing and their dependency on the Nd concentration is investigated. It was found, that concentration quenching sets in with a Nd concentration of 2at. The emission of Nd at nm, which is important for up-conversion, is passivated through water diffusion from air over time, which can be temporarily activated through thermal annealing.
So, this system is not resistant with regard to environmental influences and must be further optimized for the application as up-converter. At the end of this work, the developed and optimized down-converters are applied in amorphous thin film silicon solar cells. The glasses investigated for down-conversion are put onto amorphous thin film silicon solar cells. The commercial fluorescence glass doped with the rare earth ion Tb, leads to an increase in the internal quantum efficiency over the spectral range up to nm.
The Eu doped FCZ glass leads to an increase in the internal quantum efficiency over the spectral range up to nm. Thus providing proof-of-concept for the down-conversion of light using the rare earth ions Tb and Eu.
Nevertheless, absorption losses in the visible spectral range lead to an overall loss in the short circuit current density.