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  • 1
    Keywords: Forschungsbericht ; Gefahrstoff ; Atemschutzmaske ; Filtermittel ; Metallorganisches Netzwerk ; Aktivkohle ; Formkörper
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (24 Seiten, 1,44 MB) , Illustrationen, Diagramme
    Language: German
    Note: Förderkennzeichen BMBF 13N14194 , Verbundnummer 01174756 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
    Keywords: Forschungsbericht ; Keramik ; Töpferofen
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (107 Seiten, 12,73 MB) , Illustrationen, Diagramme
    Language: German
    Note: Förderkennzeichen BMBF 01LY1211A-B - 01LY1211D-F. - Verbund-Nummer 01136965 , Paralleltitel dem englischen Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Sprache der Zusammenfassung: Deutsch, Englisch
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  • 3
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (15 S., 223 KB) , Ill., graph. Darst.
    Language: German
    Note: Förderkennzeichen BMBF 01MT 404. - Verbund-Nr. 01031308. - Engl. Titel: Final report for the joint project: Technologies and systems for digital cinema, sub projects: Project management and introduction scenarios , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 4
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (271 S., 13,1 MB) , Ill., graph. Darst.
    Language: German , English
    Note: Förderkennzeichen BMWi 01MT08007. - Verbund-Nr. 01062795. - Engl. Zsfassung u.d.T.: Final report for the joint project: PRIME - production and projection technologies for immersive media, sub project: intoduction scenarios , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 5
    Online Resource
    Online Resource
    Zurich :Trans Tech Publications, Limited,
    Keywords: Electronic books.
    Description / Table of Contents: GADEST '93Proceedings of the 5th International Autumn Meeting, Chossewitz, Frankfurt (Oder), Germany, October 09-14, 1993.
    Type of Medium: Online Resource
    Pages: 1 online resource (636 pages)
    Edition: 1st ed.
    ISBN: 9783035706505
    Series Statement: Solid State Phenomena Series ; v.Volumes 32-33
    Language: English
    Note: Intro -- Gettering and Defect Engineering in Semiconductor Technology -- Table of Contents -- ULSI Technology - a Complex Device Manufacturing Process -- Semiconductor Isotope Engineering -- Crystalline Silicon for Solar Cells -- Light-Emitting Porous Silicon: A Defective Quantum Sponge Structure? -- Semiconducting Silicide-Silicon Heterostructures -- What Local-Density Calculations Can Teach about Semiconductor Surfaces, Interfaces and Defects -- Mechanisms of Transition Metal Gettering in Silicon -- Gettering in Silicon under Vacancy Generation Conditions -- Phosphorus External Gettering Efficiency in Multicrystalline Silicon Wafers -- Defect Engineering in Erbium-Doped Silicon Structure Technology -- PN Junction Formation by Two Steps Annealing -- Generation of the P-Induced Misfit Dislocations during the Diffusion in Silicon: Analytical Determination of the Criticy Conditions -- Processes of Defect Formation and Gettering under Dry Etching of Si and GaAs and Measurements of Diffusion Length Profile -- On the Interaction of Transition Metals with Silicon Grain Boundaries -- Dry Cleaning of Silicon Wafers in a Low Energy Hydrogen Plasma -- Reduction of Interfacial Carbon and Boron Contamination as Sources for Degradation of Epitaxial SiGe Layers Grown by MBE -- Misfit Strain Engineering in Heteroepitaxial Structures -- Surfactant-Mediated MBE of Strained-Layer III-V Semiconductor Heterostructures -- Transition Metal Gettering in Poly-Silicon for Photovoltaic Applications (Abstract) -- Properties of Hydrogen, Oxygen and Carbon in Si -- Solubility of Hydrogen in Silicon at High Temperatures -- Effect of Oxygen Concentration on the Kinetics of Oxygen Loss and Thermal Donor Formation in Silicon at Temperatures between 350° C and 500° C -- Evolution of Oxygen Clusters and Agglomerates in Annealed Cz-Si at High Pressure - High Temperature. , Peculiarities in the Defect Behavior in Heat-Treated Cz-Si with a Low and High Oxygen Content -- New Evidences about Carbon and Oxygen Segregation Processes in Polycrystalline Silicon -- Oxygen and Copper Precipitation at the Silicon/Silicon Dioxide Interface -- The Role of Oxygen for Defect Formation in Oxygen-Rich Si- and Si1-xGex - Layers on Silicon Grown by APCVD -- Annealing Properties of N-Doped Cz-Si Crystals -- Oxygen-Related Clusters of Platinum in Silicon - an Electron Spin Resonance Study -- Formation and Properties of Tetranuclear Clusters of Manganese in Silicon -- EPR Identification of the Different Charge States of the Iron-Acceptor Pairs in Silicon -- Investigation of Deep Levels and Carrier Dynamics in SiC Films -- Process-Induced Defects in Silicon Technology -- Lattice Defects Induced in Si1-xGex Diodes by 1-MeV Electron Irradiation and their Influence on Electrical Characteristics -- Non-Equilibrium Impurity Diffusion in Silicon and Silicon Carbide -- Dopant Migration Caused by Point Defect Gradients -- Vacancy Assisted Diffusion of Si in GaAs: Microscopic Theory -- Investigation of Defect Generation and Precipitation in Antimony Implanted Silicon -- Electric-Dipole Spin Resonance on Extended Defects in Silicon -- Luminescence of Dislocations in SiGe/Si Structures -- On the Nature of Dislocation Luminescence in Si and Ge -- Defect Electrical Activity Study Using a Si(Ge) Heteroepitaxial Structure -- Properties of Dislocations and Point Defects in Fz-Si -- Metastable States Associated with Interfacial MISFIT Dislocations in Si/Si(Ge) Heterostructures -- Experimental Study of Anomalous Dislocation Kinks Drift in Germanium Single Crystals -- Cu Precipitation in Strained and Relaxing GexSi1-x Heteroepitaxial Layers -- Peculiarities of Defect Formation in SiGe/Si and SiGe/Ge Heterostructures. , The Influence of Oxidation Induced Stacking Faults on Electrical Parameters of a CCD Device -- Metals, Oxide Precipitates and Minority Carrier Lifetime in Silicon -- UHV-VLPCVD Heteroepitaxial Growth of Thin SiGe-Layers on Si-Substrates: Influence of Pressure on Kinetics and on Surface-Morphology -- Formation of High Quality SiGe/Si Heterostructures -- Liquid Phase Epitaxy of SiGe Structures -- Planar Defects and Misfit Dislocations in (001) GaAs/Ge Heterostructures MOCVD Grown with Different V/III Ratio -- Solvents Influencing the Morphology of Epitaxial Solution-Grown Strained Ge/Si Layers -- Deposition and P Doping of Si(1-x)Gex Layers in a Conventional Horizontal Tube APCVD Reactor without Load Lock System -- Misfit Dislocations in Strained Layer Epitaxy -- Stress Relaxation Mechanisms by Dislocations in the System Ge on Si -- Strain Relaxation and Threading Dislocation Density in Lattice-Mismatched Semiconductor Systems -- Relaxation Phenomena in Strained Si1-xGex Layers on Planar and Differently Patterned Si Substrates -- Equilibrium Configuration of Misfit Dislocations in Graded Buffers -- Evolution of Amorphous/Crystalline Interfacial Roughness and End-of-Range Defects during Solid-Phase Epitaxial Regrowth of Ge Implaned Silicon -- Investigations of 2D Hole Gas in Strained Ge-Ge1-xSix Superlattices -- Photoluminescence of 2D-Excitons in Ge Layers of Ge-Ge1-xSix Multiple Quantum Well Structures -- Strained Quaternary Compounds GaInAsP/InP for Infrared Laser (1.5µm) -- Persistent Decrease of Dark Conductivity due to Illumination in AlGaAs/GaAs Modulation-Doped Heterostructures -- Photoelectrical Interface Processes in Multilayer-Type Heterostructures Based on Silicon, II-VI Compounds and Photosynthetic Pigments -- Application of Electron Microscopy to Semiconductor Materials Research -- X-Ray Analysis of Strained Layer Configurations. , In Situ X-Ray Investigation of Relaxation Processes in Si1-xGex Layers on Silicon Substrate -- Determination of Superlattice Structural Parameters in Mismatched Epitaxial Structures -- Investigation of Strain in Si1-xGex/Si Heterostructures and Local Isolation Structures by Convergent Beam Electron Diffraction -- New Applications of Diffraction Analysis for Dislocation Structure in High Lattice-Mismatch MBE Grown Epitaxial Structures -- Detection of Threading Dislocations by EBIC in a SiGe Epilayer with Graded Buffer -- HREM and DLTS of Σ37(610) and Σ29(520 )[001] Tilt Grain Boundaries in Ge Bicrystals -- TEM In Situ Investigations of Interfacial Processes in the Pd/a-GeSi System -- Micro-Raman Investigations of Elastic and Plastic Strain Relief in Si1-xGex-Heterostructures -- Raman Study of the Phonon-Plasmon Modes in the Short Period GaAs/AlAs Superlattices -- Positron Annihilation on Thermal Defects in Cz-Si and Fz-Si -- Characterization of MBE Grown Si/Si1-xGex/Si Structures Using n+p-Diodes -- Investigations on Surface and Bulk Semiconductor Properties Using Wavelength Dependent TRMC Measurements -- Investigation of Recombination Properties of Ti Double Donor in Si -- Mapping Interfacial Roughness and Composition in Elemental Semiconductor Systems -- The Influence of the Electron Subsystem Excitation on the Kinetics and Dynamics of Dislocations -- Author Index.
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  • 6
    Online Resource
    Online Resource
    Zurich :Trans Tech Publications, Limited,
    Keywords: Electronic books.
    Description / Table of Contents: GADEST 1997Proceedings of the 7th International Autumn Meeting on Gettering and Defect Engineering in Semiconductor Technology (GADEST '97), Spa, Belgium, October 1997.
    Type of Medium: Online Resource
    Pages: 1 online resource (530 pages)
    Edition: 1st ed.
    ISBN: 9783035706710
    Series Statement: Solid State Phenomena Series ; v.Volumes 57-58
    Language: English
    Note: Intro -- Gettering and Defect Engineering in Semiconductor Technology VII -- Preface -- Table of Contents -- Design: New Material Challenge for Silicon ULSI -- Silicon Wafer Technology: The Challenges towards the Gigabit Era -- Hydrogen Annealed Silicon Wafer -- Formation of Microscopic Distribution of Grown-In Defects in Czochralski Silicon Crystal -- CZ Crystal Growth Development in Super Silicon Crystal Project -- Gettering by Voids in Silicon: A Comparison with other Techniques -- Gettering in Advanced Low Temperature Processes -- Metal Gettering by Defective Regions in Carbon-Implanted Silicon -- Metallic Impurity Gettering in MeV Implanted Si -- Influence of Size and Density of Oxygen Precipitates of Internal Gettering Efficiency of Iron in Czochralski-Grown Silicon -- A Quantitative Method of Metal Impurities Depth Profiling for Gettering Evaluation in Silicon Wafers -- Oxygen Gettering on Buried Layers at Post-Implantation Annealing of Hydrogen Implanted Czochralski Silicon -- Use of Gettering and Defect Induced Processes in Ultra-Thin Buried Oxide Synthesis -- Interaction of Impurities and Dislocations in Silicon before and after External Gettering -- The Influence of Intrinsic Point Defects on Getter Formation in Silicon Wafers -- Comparison of External Gettering Efficiency of Phosphorus Diffusion, Aluminium-Silicon Alloying and Helium Implantation in Silicon Wafers -- Effect of High Temperature Pre-Anneal on Oxygen Precipitates Nucleation Kinetics in Si -- Vacancy-Assisted Oxygen Precipitation Phenomena in Si -- Mechanism of Slip Dislocation Generation by Oxide Precipitates in Czochralski Silicon Wafers -- State of Oxygen and Growth Conditions -- Analyzing Oxygen Precipitation Using the Surface Photovoltage Technique (SPV) -- Study of Oxygen Related Recombination Defects in Si by Temperature-Dependent Lifetime and EBIC Measurements. , Oxygen Precipitate Nucleation Process in Silicon with Different Oxygen Concentration and Structural Perfection -- Initial Stage of Oxygen Precipitation in Silicon -- Oxygen Precipitation in Silicon Thin Layers in the Presence of Carbon -- Heterogeneous Precipitation of Silicon Oxide in Silicon at Laser Induced Centres -- Diffusion and Precipitation of Oxygen in Silicon Doped with Germanium -- Low-Temperature Doping of P-Type Czochralski Silicon due to Hydrogen Plasma Enhanced Thermal Donor Formation -- Erbium in Silicon: Problems and Challenges -- Thermal Donors in Silicon Doped with Erbium -- Radiation Induced Defects InGaAs Photodiodes by 1-MeV Fast Neutrons -- Defect Engineering Radiation Tolerant Silicon Detectors -- Microscopic Studies of Radiation Damage-Induced Defects Responsible for the Deterioration of High-Resistivity Silicon Detectors -- Lattice Defects in Si1-xGex Devices by Proton Irradiation and their Effect on Device Performance -- An IR Study of the Annealing Behaviour of A-Center in Silicon -- Lifetime Considerations for High-Energy Proton Irradiated Si p-n Junction Diodes -- Defect Formation during Erbium Implantation and Subsequent Annealing of Si:Er -- Alpha-Particle Irradiation Induced Defects in Metal-Oxide-Semiconductor Silicon Transistor -- The Change of Au-ZnS and Au-CdS Diode Structure Parameters Caused by Low-Dose X-Ray Irradiation -- Critical Resolved Shear Stress for a Dislocation Loop Growth, Stability and Retrogrowth in Silicon: Application to the 16 MEG DRAM -- Modification of the Recombination Activity of Dislocations in Silicon by Hydrogenation, Phosphorous Diffusion and Heat Treatments -- Influence of Electric Field-Enhanced Emission on Deep Level Transient Spectra of Bandlike Extended Defects: NiSi2-Precipitates in Silicon. , The Effect of Dislocation Dissociation on the g-Tensor of Holes in Dislocation Related 1D Energy Band in Si -- Influence of the Surface Metal Spraying on the Dislocation Detachment Process in Silicon Crystals -- The Magnesium Related Luminescence in Silicon and its Quenching due to the Presence of Dislocations -- Deformation Interaction of Defects in Crystal: Concept of Evaluation -- Yield Analysis of CMOS Ics -- The Role of Grown-in Defects in Advanced Silicon Technology -- Point Defect and Microdefect Dynamics in Czochralski-Grown Silicon: Simulations and Analysis of Self-Consistent Models -- Observation of Vacancy Enhancement during Rapid Thermal Annealing in Nitrogen -- Strain and Gettering in Epitaxial Silicon Wafers -- Strain in Silicon below Si3N4 Stripes, Comparison between SUPREM IV Calculation and TEM/CBED Measurements -- Defects Produced in Silicon by Reactive Ion Etching -- Depth Dependence of Dislocation Loop Dissolution Kinetics in Ion Implanted Silicon -- Hydrogen Stimulated Destruction of Fe-B Pairs in p-Si -- Differential Interference Contrast Microscopy of Defects in As-Grown and Annealed Si Wafers -- Effect of Stress Induced Defects on Electrical Properties of Czochralski Grown Silicon -- Planar Solidification of Multicrystalline Silicon for Phtovoltaic Applications -- Implementation of Low Thermal Budget Techniques to Si and SiGe MOSFET Device Processing -- Ge Concentration Effect on the Dislocation Mobility in the Bulk SiGe Alloy Single Crystals -- On the Defect Structures in Te-Doped GaAs -- Study of Surface Conduction Related Effects in GaAs MESFET's -- Nitridation Effects in n-CdTe -- Formation of Grown-in Defects in CZ-Si Crystals -- X-Ray Diffractometry and Admittance Spectroscopy Investigation of Silicon Implanted at Low Energies with Oxygen, Argon, or Silicon. , Peculiarities of Raman Spectra and Real Structure of Ge1-xSix Solid Solution -- Computer Simulation of Impurity Diffusion in the Vicinity of Grain Boundaries (Modified Fisher Model) -- Improved Extraction of Si Substrate Parameters from Combined I-V and C-V Measurements on P-N Junction Diodes -- An Experimental Study of Ion Beam and ECR Hydrogenation of Self-Ion Implantation Damage in Silicon by Admittance Spectroscopy and X-Ray Triple Crystal Diffractometry -- Positron Annihilation Rate and Broad Component of 1D-ACAR in Cz-Si and Fz-Si -- Capacitance Spectroscopy of Thin GaAs Layers Grown by Molecular Beam Epitaxy at Low Temperatures -- Raman Spectroscopy Investigation of Silicon Nanocrystals Formation in Silicon Nitride Films -- Raman and HREM Observation of Oriented Silicon Nanocrystals Inside Amorphous Silicon Films on Glass Substrates -- A Model of Coupled Diffusion of Impurity Atoms and Point Defects in the Vicinity of Semiconductor Interfaces and Grain Boundaries -- New Possibility of Impurities Express Determination by Laser Element Spark-Analyzer (LESA) -- Analytical Modeling of the Gold Diffusion Induced Modification of the Forward Current through P-N Silicon Junctions -- Keyword Index -- Author Index.
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  • 7
    Online Resource
    Online Resource
    Zurich :Trans Tech Publications, Limited,
    Keywords: Electronic books.
    Description / Table of Contents: GADEST 1995Proceedings of the 6th International Autumn Meeting on Gettering and Defect Engineering in Semiconductor Technology (GADEST '95) held in Berlin, Germany, September 1995.
    Type of Medium: Online Resource
    Pages: 1 online resource (618 pages)
    Edition: 1st ed.
    ISBN: 9783035706611
    Series Statement: Solid State Phenomena Series ; v.Volumes 47-48
    Language: English
    Note: Intro -- Gettering and Defect Engineering in Semiconductor Technology VI -- Table of Contents -- Trends and Challenges for Advanced Silicon Technologies -- Needs of Low Thermal Budget Processing in SiGe Technology -- History and Future of Semiconductor Wafer Bonding -- Building the Electron Superhighway: Back-End Processing and Simulation -- Role of Interstitial Atoms in Microscopic Processes on (113) and (001) Surfaces of Silicon -- Silicon Materials and Metrology: Critical Concepts for Optimal IC Performance in the Gigabit Era -- Expected Limits for Manufacturing Very Large Silicon Wafers -- Diameter Effects on Grown-In Defects in CZ Crystal Growth -- Silicon Carbide - A Promising Wide-Band-Gap Semiconductor for Electronic Devices -- Multicrystalline Silicon for Solar Cells -- Room Temperature UHV Silicon Direct Bonding -- External Gettering for Multicrystalline Silicon Wafers -- Gettering of Transition Metals in Multicrystalline Silicon for Photovoltaic Applications -- Gettering of Au in Heat Treated Si/SiGe/Si Structures -- Gettering of Low Concentration Copper, Nickel and Iron Contamination in Czochralski Silicon Wafers -- Defect Engineering for Silicon-on-Insulator, MeV Implantation and Low Temperature Processing -- Interactions between Dopants and End-of-Range Defects in Silicon -- Behaviour of the Size Distribution Function of End-of-Range Dislocation Loops during Silicon Oxidation -- SiC Buried Layer Formation Induced by Ion Implantation -- The Mechanisms and Application of Dislocation Related Radiation for Silicon Based Light Sources -- Critical Conditions for the Generation of the Misfit Dislocations during the Boron Diffusion in Silicon: Analytical Evaluation -- Infrared Studies of Oxygen Precipitation Related Defects in Silicon after Various Thermal Treatments -- Point Defects in Semiconductors - Then and Now. , Oxygen Aggregation Phenomena in Silicon -- New Donors in Heat-Treated Cz-Si, Their Components and Formation Kinetics -- Hydrogen Passivation of Double Donors in Silicon -- Phosphorus Diffusion Induced Reconstruction of Defect Structure in Oxygen Precipitated Si -- New Infrared Bands in Neutron-Irradiated Si -- Iron Group Impurities in Semiconducting Iron Disilicide -- Fermi-Level Shifts Caused by Reactions of Intrinsic Defects at 450°C - 540°C in FZ- and Cz-Silicon Supersaturated with Platinum- An Electron Paramagnetic Resonance Study -- Influence of Point Defects on Defect Formation in Si:Er -- The Si:Er Crystal: Model and Excitation Mechanism of the Er-O Center -- Point Defect Concentrations, Distributions and Diffusivity in Thin Si MBE-Films: Experiments and Simulations Based on Profiling of Implanted Multiple Delta Doping Structures -- DX-Like Centers in Dislocated Compound Semiconductors: A New Aspect of the Interaction between Extended Defects and Impurities -- DRAM Wafer Qualification Issues: Oxide Integrity vs. D-Defects, Oxygen Precipitates and High Temperature Annealing -- Copper Precipitation in Monocrystalline Silicon: Role of Initial Oxygen Concentration and Thermal Oxidation -- Structural and Electrical Properties of NiSi2 Particles in Silicon -- Contrastive Recombination Behaviour of Metal Silicide and Oxygen Precipitates in n-Type Silicon: Attempt at an Explanation -- Characterisation of High-Energy Proton Irradiation Induced Recombination Centers in Silicon -- A Study of Defects Generated by BF2+ Implantation in Silicon Crystals and Their Annealing -- Surface Damage Induced by Reactive Ion Etching in n- Type Silicon -- The Effect of Metallization Induced Defects on Metal-Semiconductor Contacts -- The Impact of Fe and Cu Contamination in the 1012 at/cm2 Range on the Performance of Junction Diodes. , Low-Frequency Noise Sources Related to Processing-Induced Extended Defects in Si Devices -- Correlation between Dislocations and Electron Transport Properties in Si/SiGe -- Dislocation Related Electroluminescence at Room Temperature in Plastically Deformed Silicon -- Investigation of the Dislocation Motion in the Bulk SiGe Crystals -- Ion Beam Sputter Deposited Si0.8Ge0.2Epilayers: Lattice Defects and Surface Topology -- GaAIAs Lattice Parameter Dependence on Free Electron Concentration -- Relation between Structural and Carrier Recombination Properties in As-Rich GaAs -- Investigation of Microdefects in Multicrystalline Silicon for Photovoltaic Applications -- Analysis of Σ=3 and Σ=9 Twin Boundaries in Three-Crystal Silicon Ingots -- Band Structure Engineering in Si-Ge Structures -- Diffusion Effects and Luminescence in Thin SiGe/Si Layers -- Investigation of the Substrate / Epitaxial Interface of Si/Si1-xGexGrown by LPCVD -- The Effect of Interface Engineering and Wave Function Localisation on Optical Response in Imperfect Type I and Type II Quantum Well Structures -- Mechanisms of Dislocation Generation in Heterostructures Based on SiGe Alloys -- Elastic and Plastic Stress Relaxation in Stripes and Circular Mesas -- Composition Dependence of Hardness and Elastic Modulus in Si-Ge Measured by Nanoindentation - Possible Consequences for Elasto-Plastic Relaxation and Diffusion -- The Relaxation and Diffusion Behaviour of Strained Si1-xGex Layers on Si Substrates at High Temperature under Hydrostatic Pressure -- Critical Points of Strained Si1-yCy Layers on Si(001) -- Dislocation-Related Photoluminescence in Graded SiGe Buffer Layers Grown by APCVD -- Elastic Relaxation of Pseudomorphic Strain in Quantum Dots -- Electrical Activity of Misfit Dislocations in GaAsSb/GaAs Heterojunctions -- Twin Formation during Epitaxial Growth of InP on Si. , Interface Structure and Dislocation Formation in InGaAs/GaAs SQWs Grown with Different In Content on Vicinal Substrates -- Determination of Interface Structure and Bonding by Z-Contrast STEM -- Tomographic Atom Probe: A New Tool for Nanoscale Characterisation -- PHOTO-EDSR in Plastically Deformed p-Si -- Cyclotron Resonance in Heavily Doped Silicon Quantum Wells -- TEM Analysis of Structure Modification Induced by Additional Carbon Incorporation in Silicon and Si1-xGex Layers Grown with Molecular Beam Epitaxy -- Measurements of Diffusion Length in Si-SiGe Structures -- Determination of Subgap-Asorption in μc-Si:H Films by CPM -- An Analysis of Residual Strain in Dry Etched Semiconductor Nanostructures -- Author Index.
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  • 8
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (67 Seiten, 4,66 MB) , Illustrationen, Diagramme
    Language: German
    Note: Literaturverzeichnis: Seite 15-20 , Förderkennzeichen BMBF 03ZZ0210B , Verbundnummer 01176254
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 12 (2000), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study identifies brain regions participating in the execution of eye movements for voluntary positive accommodation (VPA) during open-loop vergence conditions. Neuronal activity was estimated by measurement of changes in regional cerebral blood flow (rCBF) with positron emission tomography and 15O-water. Thirteen naive volunteers viewed a checkerboard pattern with their dominant right eye, while a lens interrupted the line of gaze during alternate 1.5 s intervals. Three counterbalanced tasks required central fixation and viewing of a stationary checkerboard pattern: (i) through a 0.0 diopter (D) lens; (ii) through a −5.0-D lens while avoiding volitional accommodation and permitting blur; and (iii) through a −5.0-D lens while maintaining maximal focus. The latter required large-amplitude, high-frequency VPA. As an additional control, seven of the subjects viewed passively a digitally blurred checkerboard through a 0.0-D lens as above. Optometric measurements confirmed normal visual acuity and ability to perform the focusing task (VPA). Large-amplitude saccadic eye movements, verified absent by electro-oculography, were inhibited by central fixation. Image averaging across subjects demonstrated multifocal changes in rCBF during VPA: striate and extrastriate visual cortices; superior temporal cortices; and cerebellar cortex and vermis. Decreases in rCBF occurred in the lateral intraparietal area, prefrontal and frontal and/or supplementary eye fields. Analysis of regions of interest in the visual cortex showed systematic and appropriate task dependence of rCBF. Activations may reflect sensorimotor processing along the reflex arc of the accommodation system, while deactivations may indicate inhibition of systems participating in visual search.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to identify the networks involved in the regulation of visual accommodation/vergence by contrasting the cortical functions subservient to eye-lens accommodation with those evoked by foveal fixation. Neural activity was assessed in normal volunteers by changes in rCBF measured with PET. Thirteen right-handed subjects participated in three monocular tasks: (i) resting with eyes closed; (ii) sustained foveal fixation upon a LED at 1.2 m (0.83 D); and (iii) accommodating alternately on a near (24 cm, 4.16 D) vs. a far (3.0 m, 0.33 D) LED alternately illuminated in sequential 2 s epochs. The contrast between the conditions of near/far accommodation and of constant foveal fixation revealed activation in cerebellar hemispheres and vermis; middle and inferior temporal cortex (BA 20, 21, 37); striate cortex and associative visual areas (BA 17/18). Comparison of the condition of constant fixation with the condition of resting with closed eyes indicated activation of cerebellar hemispheres and vermis; visual cortices (BA 17/18); a right hemisphere dominant network encompassing prefrontal (BA 6, 9, 47), superior parietal (BA 7), and superior temporal (BA 40) cortices; and bilateral thalamus. The contrast between the conditions of near/far accommodation with closed-eye rest reflected an incremental summation of the activations found in the previous comparisons (i.e. activations associated with constant fixation). Neural circuits activated selectively during the near/far response to blur cues over those during constant visual fixation, occupy posterior structures that include occipital visual regions, cerebellar hemispheres and vermis, and temporal cortex.
    Type of Medium: Electronic Resource
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