Denoising Your Monte Carlo Renders: Recent Advances in Image Space-Adaptive Sampling and Reconstruction

With the ongoing shift in the computer graphics industry toward Monte Carlo rendering, there is a need for effective, practical noise-reduction techniques that are applicable to a wide range of rendering effects and easily integrated into existing production pipelines. This course surveys recent advances in image-space adaptive sampling and reconstruction algorithms for noise reduction, which have proven very effective at reducing the computational cost of Monte Carlo techniques in practice. These approaches leverage advanced image-filtering techniques with statistical methods for error estimation. They are attractive because they can be integrated easily into conventional Monte Carlo rendering frameworks, they are applicable to most rendering effects, and their computational overhead is modest.

Monte-Carlo simulation of Callisto's exosphere

We model Callisto's exosphere based on its ice as well as non-ice surface via the use of a Monte-Carlo exosphere model. For the ice component we implement two putative compositions that have been computed from two possible extreme formation scenarios of the satellite. One composition represents the oxidizing state and is based on the assumption that the building blocks of Callisto were formed in the protosolar nebula and the other represents the reducing state of the gas, based on the assumption that the satellite accreted from solids condensed in the jovian sub-nebula. For the non-ice component we implemented the compositions of typical CI as well as L type chondrites. Both chondrite types have been suggested to represent Callisto's non-ice composition best. As release processes we consider surface sublimation, ion sputtering and photon-stimulated desorption. Particles are followed on their individual trajectories until they either escape Callisto's gravitational attraction, return to the surface, are ionized, or are fragmented. Our density profiles show that whereas the sublimated species dominate close to the surface on the sun-lit side, their density profiles (with the exception of H and H-2) decrease much more rapidly than the sputtered particles. The Neutral gas and Ion Mass (NIM) spectrometer, which is part of the Particle Environment Package (PEP), will investigate Callisto's exosphere during the JUICE mission. Our simulations show that NIM will be able to detect sublimated and sputtered particles from both the ice and non-ice surface. NIM's measured chemical composition will allow us to distinguish between different formation scenarios. (C) 2015 Elsevier Inc. All rights reserved.

Dr. Gottschalk van Geldern [Illustration] : Großvater Heinrich Heines, gest. 1793 im 69. Lebensjahre

Scan von Monochrom-Mikroform

Isak Noah Mannheimer [Illustration] : nach einem im Besitz der Familie Finkel-Singer (Wien) befindlichen Original (geb. 1793 - gest. 1865)

Scan von Monochrom-Mikroform

Graf Carlo Sforza, Gestalten und Gestalter des heutigen Europa [Rezension]

L. F.

A 3-D CT assisted Monte Carlo evaluation of intracavitary brachytherapy implants

Intracavitary brachytherapy (ICB) combined with external beam irradiation for treatment of cervical cancer is highly successful in achieving local control. The M.D. Anderson Cancer Center employs Fletcher Suit Delclos (FSD) applicators. FSD applicators contain shields to limit dose to critical structures. Dosimetric evaluation of ICB implants is limited to assessing dose at reference points. These points serve as surrogates for treatment intensity and critical structure dose. Several studies have mentioned that the ICRU38 reference points inadequately characterize the dose distribution. Also, the ovoid shields are rarely considered in dosimetry. ^ The goal of this dissertation was to ascertain the influence of the ovoid shields on patient dose distributions. Monte Carlo dosimetry (MCD) was applied to patient computed tomography(CT) scans. These data were analyzed to determine the effect of the shields on dose to standard reference points and the bladder and rectum. The hypothesis of this work is that the ICRU38 bladder and rectal points computed conventionally are not clinically acceptable surrogates for the maximum dose points as determined by MCD. ^ MCD was applied to the tandem and ovoids. The FSD ovoids and tandem were modeled in a single input file that allowed dose to be calculated for any patient. Dose difference surface histograms(DDSH) were computed for the bladder and rectum. Reference point doses were compared between shielded and unshielded ovoids, and a commercial treatment planning system. ^ The results of this work showed the tandem tip screw caused a 33% reduction in dose. The ovoid shields reduced the dose by a maximum of 48.9%. DDSHs revealed on average 5% of the bladder surface area was spared 53 cGy and 5% of the rectal surface area was spared 195 cGy. The ovoid shields on average reduced the dose by 18% for the bladder point and 25% for the rectal point. The Student's t-test revealed the ICRU38 bladder and rectal points do not predict the maximum dose for these organs. ^ It is concluded that modeling the tandem and ovoid internal structures is necessary for accurate dose calculations, the bladder shielding segments may not be necessary, and that the ICRU38 bladder point is irrelevant. ^

Die Stellung der Juden in den 1793 und 1795 von Preußen erworbenen polnischen Provinzen zur Zeit der Besitznahme

Jacob Jacobsohn

Die Stellung der Juden in den 1793 und 1795 von Preußen erworbenen polnischen Provinzen zur Zeit der Besitznahme

Jacob Jacobsohn

Die Stellung der Juden in den 1793 und 1795 von Preußen erworbenen polnischen Provinzen zur Zeit der Besitznahme

Jacob Jacobsohn

Die Stellung der Juden in den 1793 und 1795 von Preußen erworbenen polnischen Provinzen zur Zeit der Besitznahme

Jacob Jacobsohn

Die Stellung der Juden in den 1793 und 1795 von Preußen erworbenen polnischen Provinzen zur Zeit der Besitznahme

Jacob Jacobsohn

Mose Haim Luzzatto : (1707 - 1747)

Simon Bernfeld

Ueber die Verhältniße der organischen Kräfte unter einander in der Reihe der verschiedenen Organisationen, die Geseze und Folgen dieser Verhältniße : eine Rede am Geburtstage des regierenden Herzogs Carl von Wirtemberg, den 11. Februar 1793 im großen akademischen Hörsale gehalten

von Carl Friedrich Kielmeyer

Réflexions sur le suicide : suivies de la défense de la reine, publiée en anoût 1793 ; et de lettres sur les écrits et le caractère de J. J. Rousseau

par ... Stae͏̈l-Holstein

Carlo Broschi oder: Des Teufels Antheil : komische Oper in 3 Akten

Musik von Auber. [Text] nach dem Franz. des Scribe