27 research outputs found
Crustal and Sedimentary Structures and Geodynamic Evolution of the West Antarctic Continental Margin and Pine Island Bay
No full textSince the last glacial maximum the West Antarctic Ice Sheet (WAIS) with a base mostly beneath the present-day sea-level has experienced dramatic volume changes within short periods of time. Studies are urgently required to show how these short-term variations are related to volume changes in the older geological past. Next to the ice drainage basins of the Weddell Sea and the Ross Embayment, Pine Island Bay forms the third-largest outflow area for the West Antarctic ice-shield. The main ice streams from the WAIS into Pine Island Bay flow through the Pine Island and Thwaites Glacier systems, through which most of the glacial-marine sediments onto the shelf of Pine Island Bay and across the continental slope into the deep sea have been transported. Geophysical surveys of the sedimentary sequences and the underlying basement of the shelf and slope of the southern Amundsen Sea, Pine Island Bay and its adjacent continental rise would allow reconstructions of the formation of the tectonic and older sedimentary processes as well as to find out about the history of large-scale glaciation in West Antarctica. Accurate models of the geodynamic- tectonic evolution contain some of the most important parameters for understanding and reconstruction of the palaeo-environment. The following objectives will be addressed during ANT XXflII4 as part of a cooperative project between the Vernadsky Institute in Moscow (Dr. Gleb Udintsev) and AWl:K. Gohl, G. Uenzelmann-Neben, G. Eagles, A. Fahl, T. Feigl, J. Grobys, J. Just, V. Leinweber, N. Lensch, C. Mayr, N. Parsiegla, N. Rackebrandt, P. Schloter, S. Suckro, K. Zimmermann, S. Gauger, H. Bohlmann, G. L. Netzeband, and P. Lemenkova. Crustal and Sedimentary Structures and Geodynamic Evolution of the West Antarctic Continental Margin and Pine Island Bay. Germany, Bremerhaven, 2006. doi: 10.13140/RG.2.2.16473.36961
Aesop's Fables for Preschoolers
No full textThis is a large format booklet of 26 pages on heavy paper stock. It offers ten stories: LM, BS, GA, TH, DS, CP, “Boys and Frogs,” “Crab and Mother,” MM, and BC. The art is large, simple, playful: apt for preschoolers. The texts, as though typewritten, might use some words unfamiliar to preschoolers, like the “toils” of a hunter’s net or the grasshopper’s “fiddle.” I suspect that the texts, including their morals, were taken from some classic source. The tortoise wears glasses. The dog in DS has a good greed statement: “I need that bigger bone.” The moral for TH, which in its narrative speaks of “going slowly but steadily” is “The race is not always to the swift.” Will preschoolers understand that statement?No Autho
Deep crustal refraction and reflection seismics. Crustal and sedimentary structures and geodynamic evolution of the West Antarctic continental margin and Pine Island
No full textAccurate models of the geodynamic-tectonic evolution contain some of the most important parameters for understanding and reconstruction of the palaeo- environment. Geophysical surveys of the sedimentary sequences and the underlying basement of the shelf and slope of the southern Amundsen Sea, Pine Island Bay and its adjacent continental rise allow reconstructions of the formation of the tectonic and older sedimentary processes. The following objectives are addressed as part of a cooperative project between the Vernadsky Institute in Moscow (Dr. Gleb Udintsev) and AWI:• Identification of the boundaries between suspected crustal blocks and volcanic zones in Pine Island Bay. The glacier troughs and Pine Island Bay are thought to have developed along such tectonic boundaries.• During and after separation from the Chatham Rise and Campbell Plateau (New Zealand), the continental margin of Marie Byrd Land developed as a passive margin, probably accompanied by intensive volcanism. The question is whether this volcanism occurred mainly during the rifting process or during post-rift phases, or if it developed in relation to the West Antarctic rift system.• Recording of the sedimentary sequences across the shelf, slope and the continental rise, using deep reflection seismics, sub-bottom profiler (Parasound) and swath-bathymetry (Hydrosweep) in order to derive a sedimentation model.• Mapping of the acoustic basement and its structure with deep seismic reflection methods to obtain the tectonic geometries and boundary conditions necessary to understand sediment transport and depositional processes.info:eu-repo/semantics/publishe
Optimization Techniques in Computer Graphics and Appearance Fabrication
No full textTobias Rittig Optimization Techniques in Computer Graphics and Appearance Fabrication Optimization, the process of improving an intermediate solution, has been applied in numerous fields of computer science and beyond. Visual computing has throughout been at the forefront of developing new techniques and applying them to synthesize or analyze visual reality. At the latest, the recent boom of deep learning has given attention to large- scale differentiable computation and the application of gradient-descent optimization. This thesis spans parts of this development in four shared first-author publications (three journal, one conference) and three co-authored journal papers. It shows how optimization algorithms are used in two distinct fields of computer graphics. First, the focus is on the emerging field of Appearance Fabrication using full-color 3D printing. We show the benefits of an iterative optimization loop on the sharpness and color accuracy of translucent printouts. Such a loop, consisting of a forward pre- diction and backward refinement, can be composed of various building blocks developed throughout the thesis. The forward prediction can be driven by accurate Monte Carlo path tracing or an approximate neural rendering solution. The backward refinement can rely on a heuristic or a gradient-descent..
Optimalizační techniky v počítačové grafice a výrobě vzhledu
No full textTobias Rittig Optimalizaní techniky v poítaové grafice a výrob vzhledu Optimalizace, proces zlepování prbných výsledk, byl aplikován v mnoha oblastech infor- matiky i mimo ni. Vizuální výpoty byly po celou dobu v popedí vývoje nových technik a jejich aplikace k syntéze nebo analýze vizuální reality. Pi nedávném rozvoji hlubokého uení se vnovala pozornost rozsáhlým diferencovatelným výpotm a aplikaci optimalizace pomocí gradientního sestupu. Tato práce zachycuje ásti tohoto vývoje ve tyech sdílených publikacích prvního autora (tikrát v asopise, jednou na konferenci) a tech spoluautorských láncích v asopise. Ukazuje, jak se optimalizaní algoritmy pouívají ve dvou odliných oblastech poítaové grafiky. Zaprvé se zamujeme na vznikající oblast výroby vzhledu pomocí plnobarevného 3D tisku. Ukazujeme výhody iterativní optimalizaní smyky na ostrosti a pesnosti barev prsvitných výtisk. Tato smyka, sestávající se z dopedné predikce a zptného zpesování, me být sloena z rzných stavebních blok vyvinutých v prbhu práce. Dopedná pedpov me být ízena pesným algoritmem sledováním cest Monte Carlo nebo pibliným neurál- ním vykreslováním. Zptné upesnní se me spoléhat na heuristický algoritmus nebo na algoritmus optimalizace pomocí gradientního sestupu v kombinaci s diferencovatelným vykreslováním. Dále analyzujeme aplikaci...Tobias Rittig Optimization Techniques in Computer Graphics and Appearance Fabrication Optimization, the process of improving an intermediate solution, has been applied in numerous fields of computer science and beyond. Visual computing has throughout been at the forefront of developing new techniques and applying them to synthesize or analyze visual reality. At the latest, the recent boom of deep learning has given attention to large- scale differentiable computation and the application of gradient-descent optimization. This thesis spans parts of this development in four shared first-author publications (three journal, one conference) and three co-authored journal papers. It shows how optimization algorithms are used in two distinct fields of computer graphics. First, the focus is on the emerging field of Appearance Fabrication using full-color 3D printing. We show the benefits of an iterative optimization loop on the sharpness and color accuracy of translucent printouts. Such a loop, consisting of a forward pre- diction and backward refinement, can be composed of various building blocks developed throughout the thesis. The forward prediction can be driven by accurate Monte Carlo path tracing or an approximate neural rendering solution. The backward refinement can rely on a heuristic or a gradient-descent...Department of Software and Computer Science EducationKatedra softwaru a výuky informatikyMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Applying Visual Analytics to Physically Based Rendering
No full textPhysically based rendering is a well-understood technique to produce realistic-looking images. However, different algorithms exist for efficiency reasons, which work well in certain cases but fail or produce rendering artefacts in others. Few tools allow a user to gain insight into the algorithmic processes. In this work, we present such a tool, which combines techniques from information visualization and visual analytics with physically based rendering. It consists of an interactive parallel coordinates plot, with a built-in sampling-based data reduction technique to visualize the attributes associated with each light sample. Twodimensional (2D) and three-dimensional (3D) heat maps depict any desired property of the rendering process. An interactively rendered 3D view of the scene displays animated light paths based on the user’s selection to gain further insight into the rendering process. The provided interactivity enables the user to guide the rendering process for more efficiency. To show its usefulness, we present several applications based on our tool. This includes differential light transport visualization to optimize light setup in a scene, finding the causes of and resolving rendering artefacts, such as fireflies, as well as a path length contribution histogram to evaluate the efficiency of different Monte Carlo estimators.Computer Graphics and Visualisatio
A Toroid Based Bunch Charge Monitor System with Machine Protection Features for FLASH and XFEL
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