423 research outputs found
From 4D reduced SYM integrals to branched-polymers
No full textBurda Z, Petersson B, Wattenberg M. From 4D reduced SYM integrals to branched-polymers. ACTA PHYSICA POLONICA B. 2003;34(10):4765-4776.We derive analytically one-loop corrections to the effective Polyakov-line operator in the branched-polymer approximation of the reduced four-dimensional supersymmetric Yang-Mills integrals
Software Management 2012: Nachhaltiges Software Management
No full textBrandt-Pook H, Fleer A, Spitta T, Wattenberg M, eds. Software Management 2012: Nachhaltiges Software Management. Lecture Notes in Informatics (LNI). 2012;P-209
Semiclassical geometry of 4D reduced supersymmetric Yang-Mills integrals
No full textBurda Z, Petersson B, Wattenberg M. Semiclassical geometry of 4D reduced supersymmetric Yang-Mills integrals. JOURNAL OF HIGH ENERGY PHYSICS. 2005;2005(03): 058.We investigate semiclassical properties of space-time geometry of the low energy limit of reduced four dimensional supersymmetric Yang-Mills integrals using Monte Carlo simulations. The limit is obtained by a one-loop approximation of the original Yang-Mills integrals leading to an effective model of branched polymers. We numerically determine the behaviour of the gyration radius, the two-point correlation function and the Polyakov-line operator in the effective model and discuss the results in the context of the large-distance behaviour of the original matrix model
Cause of geothermal temperature anomalies in Wattenberg field: unraveling the impact of hydrothermal fluid movement in the Lyons formation
No full textIncludes bibliographical references.2024 Spring.The Wattenberg Field temperature anomaly solidified the field as the largest hydrocarbon producer in the Denver Basin and has spurred industry interest in using the field for geothermal energy and CCUS. While the presence and impact of the hot subsurface temperature anomaly is known, the cause of the anomaly is not. This study proposes that heat from northeastern Colorado Mineral Belt intrusives was conducted to reservoir rocks in the Greater Wattenberg Area via the subsurface circulation and migration of hydrothermal fluids along field-wide fault zones. Using core description, XRF, thin section microscopy, and FESEM analysis, pervasive hydrothermal fluid-rock interaction was observed in the Permian Lyons Formation. The Lyons Formation is the host of various ore minerals that are found to have been emplaced and nucleated in-situ: 1) low temperature (125℃-175℃) sulfides pyrite, marcasite, sphalerite and galena; 2) intermediate temperature (125℃-225℃) sulfarsenides of the Co-Ni-As-S system, including gersdorffite, nickeline, and clinosafflorite; and, 3) the high temperature (>225℃) sulfide chalcopyrite. Ore mineral emplacement is accompanied by various intermediate temperature (>150℃-200℃) gangue mineral alteration types such as albitization, dedolomitization, and generation of Fe-Mg-metal-rich clays.
Spatial relationships between ore minerals of differing temperature regimes indicate that at least three episode of hydrothermal deposition occurred. By comparing the timing of northeastern CMB intrusions with the timing of dissolution-reprecipitation events in the Lyons, hydrothermal interaction is interpreted to have occurred in Wattenberg Field from the late Paleocene to late Miocene. Long-term heat conduction between hydrothermal fluids and the Greater Wattenberg Area sedimentary succession was facilitated by the high thermal conductivity of the Lyons Formation (3.56 Wm-1K-1) and maintained by the thick, insulating Mesozoic sedimentary succession – ultimately causing the Wattenberg Field temperature anomaly.
Hydrothermal fluid-rock alteration begets critical implications for CCUS and geothermal activity in Wattenberg Field. Operators should investigate potentially detrimental chemical reactions that could occur between sequestered gases, sulfides, and sulfarsenides. Geothermal system designs should account for potential dissolution and remobilization of cementing metals that could alter reservoir characteristics and release metals to the groundwater supply. Overall, understanding the distribution and impact of hydrothermal alteration will improve energy exploration strategies in the Greater Wattenberg Area
Geschlechterunterschiede bei Gewalterfahrungen und -auswirkungen
No full textRüweler M, Ernst C, Wattenberg I, Hornberg C. Geschlechterunterschiede bei Gewalterfahrungen und -auswirkungen. In: Hurrelmann K, Kolip P, eds. Handbuch Geschlecht und Gesundheit. Bern: Verlag Hans Huber; 2015
Gesundheitliche Auswirkungen von Gewalt aus Geschlechterperspektive
No full textRüweler M, Ernst C, Wattenberg I, Hornberg C. Gesundheitliche Auswirkungen von Gewalt aus Geschlechterperspektive. In: Kolip P, Hurrelmann K, eds. Handbuch Geschlecht und Gesundheit. Männer und Frauen im Vergleich. Bern: Hogrefe, vorm. Verlag Hans Huber; 2015
Development of framework for predicting water production from oil and gas wells in Wattenberg field, Colorado
No full text2012 Fall.Includes bibliographical references.Water issues in the oil and gas industry have drawn attention from various stakeholders including the public, industry and environmental groups. With the increasing demand for energy, the number of oil and gas wells has increased greatly providing 60% of the energy in the United States. Besides the large volume of fresh water required for drilling and hydraulic fracturing, wastewater from the well can also lead to serious problems. The current approach for managing wastewater from oil and gas fields is deep well injection or evaporation both of which can potentially cause environmental issues. One of the best strategies to solve water issues from oil and gas operations is to reuse wastewater as drilling and fracturing water so the volume of fresh water required and wastewater disposed can be reduced. Information on both water quantity and quality are required when designing wastewater reuse treatment facilities. This study provides a framework for understanding water production trends from oil and gas wells in the Wattenberg field in Northern Colorado by analyzing historical data from Noble Energy Inc. The Arps equations were chosen for modeling water production from oil and gas wells. After studying 1,677 vertical and 32 horizontal wells in Wattenberg field, an exponential decline function was applied to model the produced water production of all the wells and the frac flowback water of horizontal wells. An Excel based 30-year water production prediction tool was developed based on the two protocols developed for vertical and horizontal wells in the Wattenberg field. Three case studies of different subsets of oil and gas wells were examined to illustrate the function of the tool. In addition, a comparison of exponential and harmonic functions was made in the third case study, and a significant difference was observed. The harmonic decline function predicts a less aggressive decline resulting in higher production volumes. It was concluded that in the absence of long term production data, the harmonic decline function should be used since the exponential decline function may underestimate the volume of produced water
Interprofessionelles Handeln in einer Multiplayer-Virtual Reality (VR)-Simulation – Chancen und Herausforderungen Meeting Abstract
No full textLätzsch R, Falk-Dulisch M, Hornberg C, Wattenberg-Karapinar I, Eickelmann A-K. Interprofessionelles Handeln in einer Multiplayer-Virtual Reality (VR)-Simulation – Chancen und Herausforderungen Meeting Abstract. In: Abstractband: Jahrestagung der Gesellschaft für Medizinische Ausbildung (GMA). Düsseldorf: German Medical Science GMS Publishing House; 2023
Von 4D reduzierten supersymmetrischen Yang-Mills-Integralen zu verzweigten Polymeren
No full textWattenberg M. From 4D reduced supersymmetric Yang-Mills integrals to branched polymers. Bielefeld (Germany): Bielefeld University; 2004.Diese Arbeit beschäftigt sich mit der Untersuchung des IIb Matrix-Modells - eine nicht-störungstheoretische Definition des Superstrings - anhand dessen Niederenergie-Theorie, eines Modells von verzweigten Polymeren.
Der erste Teil diskutiert die Hauptmerkmale des IIb Matrix-Modells und zeigt eine detaillierte Herleitung seiner Ein-Loop-Näherung, welche in vier Dimensionen auf ein Modell von verzweigten Polymeren führt. Darüber hinaus wird der Polyakov-Line Operator innerhalb dieser Approximation hergeleitet, gefolgt von der Berechnung seiner Ein-Punkt-Korrelationsfunktion für das vierdimensionale Modell verzweigter Polymere.
Der zweite Teil gibt eine allgemeine Einführung in Modelle von Baum-Graphen und zeigt eine detaillierte Untersuchung des Skalenverhaltens, der fraktalen Geometrie sowie der inneren und äußeren Korrelationsfunktionen.
Zum Schluss werden numerische Ergebnisse aus dem Modell verzweigter Polymere mit denen des IIb Matrix-Modells verglichen.In this thesis the IIb matrix model, proposed to be a nonperturbative definition of the superstring, is investigated by means of its low-energy effective theory, a model of branched polymers.
In the first part the main features of the IIb matrix model are discussed and a detailed derivation of its one-loop effective theory is presented, which will be seen to result in a model of branched polymers in D=4. Further the Polyakov-line operator is derived within the branched polymer approximation and its one-point correlation function is calculated for the 4D branched polymer model.
The second part gives a general introduction to geometrical models of tree graphs and presents a detailed investigation of its scaling behaviour, fractal geometry as well as internal and external correlation functions.
Finally, numerical results from the branched polymer model are compared to those of the IIb matrix model
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