cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Real-Time Ambiguity-fixed Precise Point Positioning Using Global and Regional Reference Networks
Creators: name: Li, Yihe
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Geodesy
subject: Global Navigation Satellite System (GNSS)
subject: Orbit arc length
subject: Orbit prediction
subject: Fractional Cycle Bias (FCB)
subject: PPP Ambiguity Resolution (AR)
subject: Regional augmented PPP
subject: Atmospheric stochastic model

description: Ambiguity resolution with PPP is able to reduce the long convergence time. However, real-time PPP suffers from slow ambiguity-fixing due to the real-time orbits and clocks with lower quality. The research in this thesis aims at addressing several challenging issues of PPP ambiguity resolution in real-time situations. The determination of real-time orbits and clocks has first been investigated in this thesis. The real-time orbits have been generated based on the estimated initial parameters with previous data, while the real-time satellite clocks and Fractional Cycle Biases (FCBs) have been estimated from a network of GNSS data. Then a software package has been developed to generate the real-time orbits and clocks as well as FCBs for assessing the performance of PPP ambiguity resolution and positioning. The Solar Radiation Pressure (SRP) parameters have been identified as the key factor driving orbit prediction accuracies as a function of arc length. Based on the minimization of SRP parameter variation, the optimal arc length has been determined for precise orbit prediction, with which the high-accuracy satellite clocks can be estimated. In addition, PPP ambiguity resolution performance has been quantitatively evaluated using the real-time orbits and estimated clocks with different arc lengths. A cascaded method of satellite FCB estimation has been developed to improve real-time PPP ambiguity resolution. The satellite clocks have been first estimated to compensate part of real-time orbit errors. Then the Narrow-Lane (NL) FCBs have been subsequently estimated as one directional-independent term and three direction-dependent terms, rather than a directional-independent term as did in the past. The improvements of the resulting ambiguity fix rates and positioning accuracy have been demonstrated. A new method for regional augmented PPP by using atmospheric corrections and their stochastic model derived from regional reference networks has been developed. The interpolated atmospheric corrections have been then applied by users as the pseudo-observations with the estimated stochastic model to properly describe their uncertainties. Some future work has been provided in the end to consider satellite FCB estimation and PPP ambiguity resolution, validation of Cascaded Orbit Error Separation (COES) method with multi-constellation data, and improvement of the integer ambiguity resolution in real-time PPP.
Cerebral Blood Flow, Fitness and Behaviour Changes With a High Intensity, Socially Engaging Physical Activity Program for Young Adults With Autism Spectrum Disorder
Creators: name: Wickenheiser, Hayley
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Education--Health
subject: Education--Physical
subject: Education--Sciences
subject: Recreation
subject: Social Work
subject: FOS: Sociology
subject: Physiology
subject: FOS: Biological sciences
subject: Mental Health
subject: Rehabilitation and Therapy
subject: Psychology--Behavioral
subject: Psychology--Physiological
subject: Psychology--Social
subject: Autism
subject: Exercise
subject: Cerebral Blood Flow

description: The effects of a moderate to vigorous physical activity (MVPA) intervention on cerebral blood flow (CBF), fitness, and motor competence in young adults 18-35 with Autism Spectrum Disorder (ASD) were examined. Thirteen male and female participants underwent a one-hour weekly supervised, and a 30 minute 3 x weekly unsupervised, MVPA intervention. Arterial spin labeling (ASL), fitness testing, and diagnostic measurements gauged changes in CBF, fitness, and behaviors respectively. Statistical significance (p<0.05) was found in the Autism Diagnostic Observation Schedule (ADOS II) (pre mean=14.58, sd 4.38, n=12, post mean= 12.58, sd 4.17, n=12, p value=0.03) and wall sits (pre mean= 27.7s, sd 24.57, n=11, post mean= 42.3s, sd 23.98, n=11, p-value=0.04). CBF decreased insignificantly (p=0.62), and did not correlate with increases in NIRS (p=0.38) or aerobic fitness (p=0.30). The small increase in total Hb, using NIRS, suggests regional vs. global differences. The effectiveness of exercise in ASD requires more research.
ILD Benchmark: Search for Extra Scalars Produced in Association with a $Z$ boson at $\sqrt{s}=500$ GeV
Creators: name: Wang, Yan
name: Berggren, Mikael
name: List, Jenny
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020
Subjects: * Automatic Keywords *
boson: scalar
photon: radiation
muon: pair
radiation: initial-state interaction
ILD detector
benchmark
ILC Coll
momentum resolution
magnetic field
initial state
sensitivity
performance
recoil

description: We study the prospects for discovering an extra scalar boson $S^0$ at the International Linear Collider (ILC) based on a full simulation of the International Large Detector (ILD). In order to provide results in an as model-independent way as possible, the analysis uses the recoil of the scalar against a $Z$ boson decaying into a pair of muons, $e^+e^- \to \mu\mu S^{0}$. This process serves as a physics benchmark for the ILD detector performance at $\sqrt{s}=500$ GeV, specifically for the muon ID and momentum resolution, as well as for the identification of initial state radiation photons and their energy measurement. As final results, the sensitivities for discovering the extra scalars at 2 $\sigma$ level are evaluated in terms of a scale factor $\sin^2{\theta}$ with respect to the Standard Model value of the cross section for the Higgs--strahlung process. Two detector models, IDR-L and IDR-S, are considered in the analysis, which differ in radius of the tracking volume, aspect ratio and strength of the magnetic field. While the two detector models show a visible difference in the precision of the reconstructed invariant di-muon mass, no difference is found at the level of the final results.
Dietary Manipulation of Gut Microbiota for Improvement of Metabolic Health
Creators: name: Bomhof, Marc
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Nutrition
subject: Obesity
subject: Gut Microbiota
subject: Prebiotic
subject: Probiotic

description: Background: Obesity is a highly complex disease state for which there remains a dearth of effective treatment and prevention strategies. An abundance of research now suggests that gut microbiota plays a role in the pathogenesis of obesity, making it a prime target for obesity management. Objective: This dissertation examines how dietary agents including prebiotics and probiotics, gut microbiota, and host physiology interact to affect metabolic health in obesity. Specifically, the objectives of this thesis include: 1) assess the individual and combined effects of a prebiotic and probiotic on metabolic health in obese rats; 2) determine the gut microbiota- dependent and -independent actions of the prebiotic oligofructose using a model of selective decontamination with antibiotics in obese rats; 3) examine the effectiveness of the prebiotic oligofructose for treatment of liver-biopsy confirmed non-alcoholic steatohepatitis (NASH) in a pilot clinical trial. Methods: Animal studies were conducted using diet-induced obese rats. Individuals with NASH were recruited by physicians from the Foothills Medical Centre. Body composition was measured with dual x-ray absorptiometry (DXA). Oral glucose tolerance tests (OGTTs) were conducted to measure glycemia. Markers of satiety, inflammation, and intestinal permeability were measured in blood. Gut microbiota was assessed using qPCR and 16S rRNA gene sequencing. Gene expression was measured using real time RT-PCR. Pre-post study liver biopsies were collected to assess histological changes in NASH. Results: The primary findings from our three study objectives were: 1) oligofructose, in comparison to Bifidobacterium animalis ssp. lactis BB-12, provides a more potent stimulus in reducing adiposity and modifying gut microbiota; 2) the ability of oligofructose to reduce adiposity and intestinal permeability is attenuated when Lactobacillus and Bifidobacterium growth is impeded with ampicillin in an animal model; 3) oligofructose supplementation improves histological measures of steatosis and has a tendency to decrease hepatocellular inflammation in individuals with NASH. Conclusion: Our results provide evidence for the role of prebiotics in correcting metabolic dysfunction in obesity. The findings from our pilot study provide the rationale for a larger-scale clinical trial assessing the effects of inulin type fructans and other prebiotics in NASH.
Jornalismo na Escola: um projeto do “Setúbal na Rede” para formar bons consumidores de informação
Creators: name: Brinca, Pedro
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Aproximar os cidadãos do jornalismo foi o objetivo principal do projeto “Jornalismo na Escola”, lançado pela Setúbal na Rede, Associação para a Cidadania, e com visibilidade através do portal “Setúbal na Rede”. E aquelas críticas que se ouviam amiúde dirigidas aos jornalistas, apareceram sistematizadas na boca dos adolescentes que foram chamados a participar nas iniciativas desenvolvidas nas escolas. Onze escolas e agrupamentos, do primeiro ciclo do ensino básico ao secundário, aderiram no primeiro ano do projeto. A ideia foi de criar um conjunto de jovens repórteres em cada escola ou agrupamento, formados e acompanhados a partir de workshops da responsabilidade do “Setúbal na Rede” e com o envolvimento dos professores. Não se pretende formar jornalistas, mas bons consumidores de informação. Se é verdade que o jornalismo desempenha um papel fundamental na sociedade, como garante da democracia, da cidadania e dos direitos individuais e coletivos, também é certo que só faz sentido se tiver leitores, ouvintes e espetadores minimamente interessados. Mais do que dominarem a tecnologia mediática, é preciso que os cidadãos percebam a gramática, a estrutura narrativa, o encadeamento das informações. Há, no fundo, uma linguagem própria do jornalismo que, tal como o inglês, é essencial para interagir com o mundo moderno e tem que ser difundida por todos. A Setúbal na Rede – SNR, Associação para a Cidadania, nasce com o objetivo de complementar a atividade do jornal e do portal regional “Setúbal na Rede” naquilo que é a sua vertente mais ligada à responsabilidade social, à componente cultural e à promoção de valores na sociedade, objetivos que se identificam claramente como não tendo propósitos lucrativos. Foi neste âmbito que surgiu, de uma forma natural mas adiado durante muito tempo, o desafio de colaboração com as escolas do distrito. Um projeto que avança para o seu segundo ano.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
title: 15. Gemeinsames Kolloquium Konstruktionstechnik 2017
title: Interdisziplinäre Produktentwicklung
titleType: AlternativeTitle
Creators: name: Köhler, Peter
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2017
Subjects: modellbasierte Produktentwicklung
Berechnung und Simulation
Virtualität
Produktmodelldatenqualiutät
Wissensmanagment
Engineering Prozesse

description: Begriffe wie Industrie 4.0, Digitalisierung, Smart Engineering, Digitaler Zwilling stehen für aktuelle Trends, in die sich zahlreiche Forschungs- und Entwicklungsaktivitäten einordnen lassen. Sie bedeuten allerdings nicht, dass die Themenfelder, die mit Begriffen wie Knowledge Based Engineering, Product Lifecycle Management, Virtuelles Prototyping usw. verbunden sind, schon ausreichend bearbeitet wurden. Aber „Schlagwörter“ sollen ja stets auch helfen, notwendigen Entwicklungen den richtigen Schwung zu verleihen. Das setzt natürlich einen gewissen Entwicklungsstand in verschiedenen Bereichen voraus. Das wird auch in zahlreichen Beiträgen dieses Tagungsbandes deutlich. Es ist seit vielen Jahren gute Tradition, dass vor allem junge Wissenschaftlerinnen und Wissenschaftler aus Konstruktionslehrstühlen verschiedener Hochschulen und Universitäten das Kolloquium nutzen, um ihre Forschungs- und Entwicklungsarbeit zur Diskussion zu stellen.

Das erste Gemeinsame Kolloquium Konstruktionstechnik fand 2003 in Rostock statt. Es wurde von den Konstruktionslehrstühlen der Universitäten Rostock, Dresden und Magdeburg initiiert. Seit 2007 gehören auch die Konstruktionslehrstühle der Universitäten Aachen und Bayreuth zu den Mitveranstaltern und seit drei Jahren auch die der Universitäten Duisburg-Essen und Clausthal. Sehr erfreulich ist, dass in diesem Jahr dieses Angebot zum Gedankenaustausch über aktuelle Problemstellungen auch wieder von anderen Universitäten und Hochschulen sowie von Vertretern aus der industriellen Praxis genutzt wird. Dabei stehen insbesondere Themen im Vordergrund, die sich mit dem qualifizierten Einsatz moderner Informationstechniken in interdisziplinären Produktentwicklungsprozessen beschäftigen. Ging es vor rund 40 Jahren bei der beginnenden Digitalisierung im Bereich der Konstruktionstechnik noch darum, digitale geometrische Repräsentationen der Konstruktionsobjekte zu erzeugen oder Berechnungssysteme aufzubauen, so wird heute mit dem Begriff der Digitalisierung in diesem Bereich der Wandel hin zu digitalen System- und Prozessmodellen verbunden, die miteinander kommunizieren können bzw. informationstechnisch verknüpft und abgesichert sind. Drauf aufbauend fokussieren einige Aktivitäten von „Industrie 4.0“ auf die Einbindung der realen Welt. Das stellt auch die Konstruktionswissenschaftler immer wieder vor neue Herausforderungen.
The Meaning and Practice of Stewardship
Creators: name: McArthur, Margaret
Publisher: name: Environmental Design
Year: 2012
Subjects: subject: Cultural
subject: Stewardship

description: The term ‘stewardship’ has historically been used in ‘Western’ societies in reference to the human-environment relationship. Its use today in popular environmental discourse is widespread but not well documented. Through a historical literature review of stewardship involving multidisciplinary sources, several meanings associated with the use of the term were identified and organized into a typology of meanings over time. The emerging meaning was then compared to the results of interviews with representatives of eleven self-identified Alberta public sector ‘stewardship’ organizations. The purpose of the interviews was to identify what stewardship practitioners in Alberta mean by the use of the term stewardship. The results showed strong agreement on the meaning of stewardship and its defining characteristics among the stewardship groups and with the typology created from literature review. Specifically, contemporary stewardship is described as a values-based collaborative practice that is focused on environmental conservation and community capacity building.
NA61/SHINE physics program -- first results and future plans
Creators: name: Czopowicz, Tobiasz
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals are to be achieved by performing a twodimensional phase diagram (T - μB) scan measurements of hadron production as a function of collision energy and system size. With its large acceptance and good particle identification NA61/SHINE also performs detailed and precise particle production measurements for the T2K, Pierre Auger Observatory and KASCADEGrande experiments. This contribution summarizes current status and future plans as well as presents the first physics results of the NA61/SHINE experiment.
description: ISMD2011 conference proceedings 4 pages, 4 figures
Using Long Kasami Sequences for Acoustic Scatterer Identification and Object Imaging
Creators: name: Leskiw, Christopher
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Engineering--Electronics and Electrical
subject: Acoustics
subject: Imaging
subject: Kasami
subject: sequences
subject: pseudo-random

description: Acoustic image acquisition is a trade off between many factors including available signal power, allowable signal power, medium bandwidth and image frame rate. Excitation signals derived from short codes or modulated pulses is an area of much research to improve performance. This thesis focuses on the use of long Kasami transmit sequences to identify scatterer parameters and locate heterogeneities. The use of long sequences provides a means of increasing signal-to-noise ratio despite a fixed amount of transmit power. This thesis makes a contribution in a few areas related to the acoustic imaging problem. The core innovation of the work develops and verifies the use of a continuous illuminating acoustic beam in contrast to short high energy pulses for the recovery of the locations of scatterers normally undetectable with shorter excitations of the same amplitude. Secondary to the main proposal, concurrent transmitting and receiving of multiple scanlines in the same environment is achieved by employing pseudo-random sequences with optimal orthogonality from the Kasami set such that multiple independent scanlines are decorrelated and recovered. Another auxiliary benefit is parameter identification from demodulated in-phase and quadrature versions of the recovered sequences. These provide linearly independent information related to velocity and density parameters of scatteres. The core concept and its accessories are implemented with a low cost, commercially available architecture. The approach used in this thesis starts with the development of an analytical model that relates the cross-correlation result of long pseudo-random sequences and recovered information to locations and physical parameter values. The concept is demonstrated with Kasami sequences in simulation and with laboratory experiments. Results show that long Kasami transmit sequences, even if sustained indefinitely, recover the density and wave velocity values of scatterers, and detect internal interfaces of objects despite interference from foreign, concurrent imaging beams.
Supersoft Supersymmetry is Super-Safe
Creators: name: Kribs, Graham D.
name: Martin, Adam
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We show that supersymmetric models with a large Dirac gluino mass can evade much of the jets plus missing energy searches at LHC. Dirac gaugino masses arise from "supersoft" operators that lead to finite one-loop suppressed contributions to the scalar masses. A little hierarchy between the Dirac gluino mass 5 - 10 times heavier than the squark masses is automatic and technically natural, in stark contrast to supersymmetric models with Majorana gaugino masses. At the LHC, colored sparticle production is suppressed not only by the absence of gluino pair (or associated) production, but also because several of the largest squark pair production channels are suppressed or absent. We recast the null results from the present jets plus missing energy searches at LHC for supersymmetry onto a supersoft supersymmetric simplified model (SSSM). Assuming a massless LSP, we find the strongest bounds are: 748 GeV from a 2j + MET search at ATLAS (4.7 fb^{-1}), and 684 GeV from a combined jets plus missing energy search using $α_T$ at CMS (1.1 fb^{-1}). In the absence of a future observation, we estimate the bounds on the squark masses to improve only modestly with increased luminosity. We also briefly consider the further weakening in the bounds as the LSP mass is increased.
description: 13 pages, 8 figures
A literacia matemática nas notícias: um problema para o jornalismo?
Creators: name: Pereira, Susana
name: Azevedo, José
name: Machiavelo, António
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Estudos já realizados nalguns países (Maier, 2000); (Brand, 2006) procuram sistematizar informação e perceber a origem de um problema que vários autores apontam (Paulos, 1995); (Best, 2001); (Cohn & Cope, 2001): o mau uso da matemática nas notícias. A falta de literacia matemática é apontada como uma das razões para o problema referido e, em certa medida é confirmada por Maier. Após levantamento sobre informação do uso da matemática nas notícias portuguesas, procura-se agora analisar até que ponto a falta de literacia matemática é responsável pelos erros matemáticos que se identificaram nas notícias de imprensa escrita portuguesa.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
O Idoso e a Educação para os Media: novos desafios entre envelhecimento e exclusão social
Creators: name: Petrella, Simone
name: Pinto, Manuel
name: Pereira, Sara
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: O presente trabalho pretende refletir sobre o papel da Educação para os Media na sociedade atual, principalmente em relação à população idosa e à sua inclusão digital e social. A partir de uma análise da evolução do envelhecimento populacional na Europa e em Portugal, efetuaremos uma breve revisão sobre a realidade do Envelhecimento Ativo e sobre os programas e as directivas europeias que estão a ser desenvolvidas neste domínio. Numa segunda parte, refletiremos sobre os benefícios que os media podem trazer no processo de envelhecimento produtivo e inclusão do idoso, com atenção ao papel que a Educação para os Media pode desempenhar, apostando na comunicação e na aprendizagem intergeracional.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Ins Netz gestellt: Neuerscheinungen auf SavifaDok und "Literatur zu Südasien - digital"
Creators: name: Merkel-Hilf, Nicole
Publisher: name: Masala: Newsletter Virtuelle Fachbibliothek Südasien
Year: 2023

description: Masala: Newsletter Virtuelle Fachbibliothek Südasien, Bd. 10 Nr. 1 (2015)
Modelling Hazardous Surface Hoar Layers in the Mountain Snowpack over Space and Time
Creators: name: Horton, Simon
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Physical Geography
subject: Remote Sensing
subject: Engineering--Civil
subject: Surface hoar
subject: avalanche
subject: Mountain weather
subject: Persistent weak layer
subject: Numerical weather prediction

description: Surface hoar layers are a common failure layer in hazardous snow slab avalanches. Surface hoar crystals (frost) initially form on the surface of the snow, and once buried can remain a persistent weak layer for weeks or months. Avalanche forecasters have difficulty tracking the spatial distribution and mechanical properties of these layers in mountainous terrain. This thesis presents numerical models and remote sensing methods to track the distribution and properties of surface hoar layers over space and time. The formation of surface hoar was modelled with meteorological data by calculating the downward flux of water vapour from the atmospheric boundary layer. The timing of surface hoar formation and the modelled crystal size was verified at snow study sites throughout western Canada. The major surface hoar layers over several winters were predicted with fair success. Surface hoar formation was modelled over various spatial scales using meteorological data from weather forecast models. The largest surface hoar crystals formed in regions and elevation bands with clear skies, warm and humid air, cold snow surfaces, and light winds. Field surveys measured similar regional-scale patterns in surface hoar distribution. Surface hoar formation patterns on different slope aspects were observed, but were not modelled reliably. Mechanical field tests on buried surface hoar layers found layers increased in shear strength over time, but had persistent high propensity for fracture propagation. Layers with large crystals and layers overlying hard melt-freeze crusts showed greater signs of instability. Buried surface hoar layers were simulated with the snow cover model SNOWPACK and verified with avalanche observations, finding most hazardous surface hoar layers were identified with a structural stability index. Finally, the optical properties of surface hoar crystals were measured in the field with spectral instruments. Large plate-shaped crystals were less reflective at shortwave infrared wavelengths than other common surface snow grains. The methods presented in this thesis were developed into operational products that model hazardous surface hoar layers in western Canada. Further research and refinements could improve avalanche forecasts in regions prone to hazardous surface hoar layers.
title: Wolfram aus dem sächsischen Erzgebirge
title: Tungsten from Saxonian Erzgebirge, Germany
Creators: name: Schulz, Heinz
Publisher: name: Senckenberg Gesellschaft für Naturforschung
Year: 2020

description: Nach von England ausgehender Verwendung von Wolfram begann um 1860 im Osterzgebirge die Nutzung vordem in Versatz oder Schlacken verbliebener Wolframinhalte. Im Raum Zinnwald erlangte Wolframit rasch wirtschaftliche Bedeutung und sicherte den Erhalt der Bergbaubetriebe. Mit der Entwicklung von Wolframerzeugnissen für die Metallbearbeitung sowie von Glühfäden in Leuchtmitteln stieg der Bedarf und erreichte im Ersten Weltkrieges einen ersten Höhepunkt. Die Folge war der Aufschluss weiterer Vorkommen im Westerzgebirge und die Gewinnung von Wolfram aus Schlacken der Zinnverhüttung. Ein weiterer Höhepunkt folgte ab Mitte der 1930er Jahre, wobei sich der Schwerpunkt auf die westerzgebirgischen Lagerstätten verlagerte. Die letzte Wolframit-grube (Pechtelsgrün) stellte den Betrieb 1969 ein, während die Gewinnung als Nebenkomponente in Altenberg und Ehrenfriedersdorf bis 1990 erfolgte. Von 1865 bis 1990 wurden im Osterzgebirge 2.600 t aus Zinn-Wolfram- und 4.400 t Wolframmetall aus den Wolframitquarzganglagerstätten des Westerzgebirges ge-wonnen. Dazu kommen noch ca. 500 t Wolfram aus Schla-cken der Zinnverhüttung. In der Summe wurden im genannten Zeitraum wolframhaltige Rohstoffen (Erze und Schlacken) mit einem Inhalt von ca. 7.500 t Wolframmetall gewonnen. Damit ist das Ressourcenpotential des Erzgebirges nicht erschöpft, das nach neueren Bewertungen mit 95.000 t angegeben wird. Scheelitvorkommen sind nicht berücksichtigt, da deren großtechnische Aufbereitung noch nicht gelöst ist.
description: The usage of Tungsten began in the middle of 19th century. The market was primarily driven by the metallurgy for advanced tools and the fastly growing bulb industry. In the Eastern Erzgebirge (territory of Zinnwald) wolframite-mining received quickly economic importance and extended competitiveness of the local mining against fair tin from Eastern Asia. Supplementary new deposits were found and mining started in the Western Erzgebirge. In addition began the extraction of Tungsten out of backfills or drosses from tin smelting process. The Tungsten production reached a second peak in the mid-thirties of last century. During this time the centre of mining changed in the Westerzgebirge. The last mine (Pechtelsgrün) closed in 1969, whereas secondary mining out of Tungsten in the mines of Altenberg and in Ehrenfriedersdorf continued working until 1990. 2.600 tons of Tungsten metal was extracted in the Eastern Part of the Erzgebirge and 4.400 tons in the Western Part between 1895 – 1990, in addition 500 tons of Tungsten metal from drosses. In total 7.500 tons were mined out in ores from wolframite and drosses. Recent studies calculate Tungsten resources of 95.000 tons in the Erzgebirge metallogenetic province. This volume needs to be further increased by considering the Scheelite when finally a high volume production worthy extraction process is developed.
Some Novel Results From Analysis of Move To Front (MTF) List Accessing Algorithm
Creators: name: Mohanty, Rakesh
name: Patel, Sangita
name: Dash, Shiba Prasad
name: Sharma, Burle
Publisher: name: arXiv
Year: 2012
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: List accessing problem has been studied as a problem of significant theoretical and practical interest in the context of linear search. Various list accessing algorithms have been proposed in the literature and their performances have been analyzed theoretically and experimentally. Move-To-Front(MTF),Transpose (TRANS) and Frequency Count (FC) are the three primitive and widely used list accessing algorithms. Most of the other list accessing algorithms are the variants of these three algorithms. As mentioned in the literature as an open problem, direct bounds on the behavior and performance of these list accessing algorithms are needed to allow realistic comparisons. MTF has been proved to be the best performing online algorithm till date in the literature for real life inputs with locality of reference. Motivated by the above challenging research issue, in this paper, we have generated four types of input request sequences corresponding to real life inputs without locality of reference. Using these types of request sequences, we have made an analytical study for evaluating the performance of MTF list accessing algorithm to obtain some novel and interesting theoretical results.
description: 5 pages, Proceedings of the International Conference on Recent Advances in Engineering and Technology, ICRAET, Hyderabad, India, April 2012
Signos de uma ideologia: A fotografia sobre o Brasil na obra ‘O Berço da Desigualdade’, de Sebastião Salgado
Creators: name: Silva, Ana Carmem Do Nascimento
name: Souza, Élmano Ricarte De Azevêdo
name: Nobre, Itamar De Moais
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Analisa-se oito fotografias produzidas no Brasil, presentes na obra ‘O Berço da Desigualdade’ (2009), cuja autoria é de Sebastião Salgado e Cristovam Buarque. Apresenta-se possibilidades interpretativas dos textos visuais em complementação com os textos escritos. Elege-se a semiótica peirciana, e especificamente a teoria dos interpretantes como alicerce do desenvolvimento metodológico da pesquisa, como também as questões técnicas da linguagem fotográfica. Acredita-se que Sebastião Salgado por meio de suas fotografias, torna proeminente a discussão sobre problemáticas sociais específicas, no sentido de reivindicar pela dignidade, como também pela democracia dos direitos humanos e sociais dos seres fotografados. E ainda, percebe-se a força do interpretante final durante a análise.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
Quantum statistics and dynamics of nonlinear couplers with nonlinear exchange
Creators: name: Abdalla, M. Sebawe
name: El-Orany, Faisal A. A.
name: Perina, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we derive the quantum statistical and dynamical properties of nonlinear optical couplers composed of two nonlinear waveguides operating by the second subharmonic generation, which are coupled linearly through evanescent waves and nonlinearly through nondegenerate optical parametric interaction. Main attention is paid to generation and transmission of nonclassical light, based on a discussion of squeezing phenomenon, normalized second-order correlation function, and quasiprobability distribution functions. Initially coherent, number and thermal states of optical beams are considered. In particular, results are discussed in dependence on the strength of the nonlinear coupling relatively to the linear coupling. We show that if the Fock state $|1>$ enters the first waveguide and the vacuum state $|0>$ enters the second waveguide, the coupler can serve as a generator of squeezed vacuum state governed by the coupler parameters. Further, if thermal fields enter initially the waveguides the coupler plays similar role as a microwave Josephson-junction parametric amplifier to generate squeezed thermal light.
description: 32 pages, 10 figures
Electrochemical and leaching studies of enargite and chalcopyrite
Creators: name: Rivera Vasquez, Berny Fernando
Publisher: name: University of British Columbia
Year: 2010

description: The oxidative behavior of chalcopyrite and enargite in acidic ferric solutions was studied using surface characterization methods, leaching experiments and electrochemical techniques with massive electrodes and single fine particles. Results demonstrate that chalcopyrite oxidation displays classical active passive behavior, as often observed in passivating metals. Values predicted electrochemically on massive samples for the passivation potential Epp are in excellent agreement with leaching experiments in batch reactors. A transpassive regime was observed to appear after the passive regime and total dissolution of chalcopyrite was observed at potentials higher than 1.2 V vs. SCE. Passivated surfaces at low potentials between 300 and 550 mV showed non-stoichiometric chalcopyrite compounds and some isolated areas covered by sulfur. Passivated particles of chalcopyrite were reactivated with the addition of pyrite. At high potentials > 600 mV vs. SCE a dense sulfur layer was detected on particle surfaces and is assumed to be responsible for passivation at these potentials. Electrochemical studies of fine particles of enargite also showed active-passive behavior. The anodic active dissolution of enargite began at 300 mV and became passive at 700 mV vs. SCE. A compact sulfur layer on the surface of enargite particles was detected at potentials higher than 700 mV and caused passivation. Based on these electrochemical studies, enhancement of enargite leaching by addition of pyrite was proposed and validated. Leaching tests in batch reactors demonstrated that enargite can be dissolved effectively at atmospheric conditions producing elemental sulfur. Total extraction of copper was achieved within 24 h with a pyrite-to-enargite mass ratio of 4:1. Solid residues consisted entirely of porous elemental sulfur and all arsenic was found in the solution phase, predominantly as As(III). The implementation of this process at an industrial scale to leach chalcopyrite enargite concentrates will be significant, since there is no process operating at moderate temperatures and atmospheric conditions that is able to efficiently leach high-arsenic copper concentrates.
Axial Anomaly and Chiral Asymmetry in Magnetized Relativistic Matter
Creators: name: Shovkovy, Igor A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The generation of a chiral shift parameter in the normal ground state of magnetized relativistic matter is discussed. The chiral shift contributes to the axial current density, but does not modify the conventional axial anomaly relation. The analysis based on gauge invariant regularization schemes suggests that this finding is also valid in gauge theories. We argue that the chiral shift parameter can affect observable properties of compact stars. In the regime of heavy ion collisions, the chiral shift parameter can modify the key features of the chiral magnetic effect.
description: 3 pages; contribution to the proceedings of the 19th Particles and Nuclei International Conference (PANIC11), Cambridge, Massachusetts, July 24th-29th, 2011
Использование генераторного оборудования электростанций в качестве синхронных компенсаторов
Creators: name: Владимировна, Шевченко Валентина
Publisher: name: Zenodo
Year: 2013
Subjects: электрические машины
баланс электроэнергии
компенсация реактивной мощности
узел компенсации
шунтирующие реакторы

description: На русском: [Шевченко В.В. Использование генераторного оборудования электростанций в качестве синхронных компенсаторов // Тезисы докладов 21-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2013), 29-31 мая 2013 г. (ISSN 2222-2944), часть 2, секция 9 "Электромеханическое и электрическое преобразование энергии" / ред. Товажнянский Л.Л. - Украина, Харьков: НТУ "ХПИ", 2013. - С. 168. https://doi.org/10.5281/zenodo.2550775]

Для компенсации реактивной мощности в электросетях предложено использовать генераторное оборудование электростанций, отработавших свой срок, в качестве синхронных компенсаторов.

Ключевые слова: электрические машины, баланс электроэнергии, компенсация реактивной мощности, узел компенсации, шунтирующие реакторы.

Репозиторий НТУ "ХПИ" - открыть pdf. Архив НТУ "ХПИ" - открыть pdf (http).
Group field theory and simplicial gravity path integrals: A model for Holst-Plebanski gravity
Creators: name: Baratin, Aristide
name: Oriti, Daniele
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent work, a dual formulation of group field theories as non-commutative quantum field theories has been proposed, providing an exact duality between spin foam models and non-commutative simplicial path integrals for constrained BF theories. In light of this new framework, we define a model for 4d gravity which includes the Immirzi parameter gamma. It reproduces the Barrett-Crane amplitudes when gamma goes to infinity, but differs from existing models otherwise; in particular it does not require any rationality condition for gamma. We formulate the amplitudes both as BF simplicial path integrals with explicit non-commutative B variables, and in spin foam form in terms of Wigner 15j-symbols. Finally, we briefly discuss the correlation between neighboring simplices, often argued to be a problematic feature, for example, in the Barrett-Crane model.
description: 26 pages, 1 figure
Characterization of a PDGF-AA Initiated Model of Glioblastoma with Predictable Onset
Creators: name: DePetro, Jessica
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Neuroscience
subject: Oncology
subject: glioblastoma
subject: p53
subject: PDGF
subject: SVZ
subject: PDGF-AA

description: Glioblastoma multiforme is a fatal brain cancer which has eluded therapeutic advances. Although the genetic and epigenetic landscape of GBM is now well annotated, its pathogenesis remains elusive and difficult to study in the laboratory. By imitating two well documented alterations of GBM - p53 loss of function and activation of platelet derived growth factor receptor-alpha - we have created a new model of GBM and a tool to explore the kinetics of GBM initiation. In this model, cells from the subventricular zone of p53 null mice transform in vitro after approximately 100 days in PDGF-AA. Transformation is marked by abrupt, rapid proliferation, exogenous PDGF-AA independence, and the capacity to form invasive GBM-like tumors in p53 wild type, immunocompetent mice. This model offers the opportunity to study the nature and sequence of transformation-related events and potentially test novel therapeutics that target GBM in its earliest stages.
Использование генераторного оборудования электростанций в качестве синхронных компенсаторов
Creators: name: Владимировна, Шевченко Валентина
Publisher: name: Zenodo
Year: 2013
Subjects: электрические машины
баланс электроэнергии
компенсация реактивной мощности
узел компенсации
шунтирующие реакторы

description: На русском: [Шевченко В.В. Использование генераторного оборудования электростанций в качестве синхронных компенсаторов // Тезисы докладов 21-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2013), 29-31 мая 2013 г., часть 2, секция 9 "Электромеханическое и электрическое преобразование энергии" / ред. Товажнянский Л.Л. - Украина, Харьков: НТУ "ХПИ", 2013. - С. 168. https://doi.org/10.5281/zenodo.2550775]

Для компенсации реактивной мощности в электросетях предложено использовать генераторное оборудование электростанций, отработавших свой срок, в качестве синхронных компенсаторов.

Ключевые слова: электрические машины, баланс электроэнергии, компенсация реактивной мощности, узел компенсации, шунтирующие реакторы.

Репозиторий НТУ "ХПИ" - открыть pdf. Архив НТУ "ХПИ" - открыть pdf (http).
title: Zur sächsischen Provenienz einer ungefassten Amethyst­schale aus der Wiener Kunstkammer (Inventarnummer KK 1697)
title: On the Saxonian provenience of an amethyst bowl from the Kunstkammer in Vienna (inventory number KK 1697)
Creators: name: Kempe, Ulf
name: Thalheim, Klaus
name: Wagner, Michael
Publisher: name: Senckenberg Gesellschaft für Naturforschung
Year: 2020

description: In der Kunstkammer des Kunsthistorischen Museums in Wien wird unter der Inventarnummer  KK 1697 eine ungefasste Amethystschale aufbewahrt, die bisher unter Nutzung stilistischer Kriterien in das 17. Jahrhundert datiert wurde und heute auf einem im 19. Jahrhundert gefertigten, gedrechselten hölzernem Fuß präsentiert wird. Eine nähere Begutachtung des Amethystes der Schale zeigt, dass es sich hierbei um das größte bisher bekannte geschnittene Objekt aus sogenanntem „Purschensteiner Amethyst“, einem historischen sächsischen Schmuckstein, handelt. Ein Vergleich der Inventare der Wiener Sammlungen mit den bereits von Carl Walther Fischer und Lothar Riedel ausgewerteten Akten im sächsischen Staatsarchiv lässt die Vermutung zu, dass besagte Schale zwischen 1727 und 1729 von dem aus Heidelbach nahe Purschenstein stammenden Glasschneider Johann Caspar Schmieder gefertigt wurde. Schmieder war zu diesem Zeitpunkt als Steinschneider in Dresden tätig. Zwischen 1727 und 1731 gelangte das außergewöhnliche, jedoch ungefasste Objekt wahrscheinlich über Maria Josepha (1699 – 1757), die Gemahlin des sächsischen Kurprinzen, zukünftigen Kurfürsten und polnischen Königs Friedrich Augut II. / August III. (1696 – 1763), zu deren Onkel, Kaiser Karl VI. (1685 – 1740) und durch diesen in die Wiener Kunstkammer.
description: In the Museum of Art History in Vienna, an amethyst bowl worked in the form of a shell is stored under inventory number KK 1697. Up to now, the amethyst bowl was dated back to the 17th century based on stylistic criteria. Recently, it is presented on a woody postament added in the 19th century. Evaluation of characteristic features of the used amethyst material revealed a Saxonian provenience. The bowl turns out to be the largest known object made of amethyst from Purschenstein, a historical hardstone from the Erzgebirge region, Saxony. A survey of historical documents in Vienna and Dresden led us to the suggestion that this bowl was probably made between 1727 and 1729 by the glass cutter Johann Caspar Schmieder born in Heidelbach near Purschenstein, who at that time worked as a stone cutter in Dresden. He presented it to the princess Maria Josepha (1699 – 1757), wife of the later Saxonian elector and King of Poland Friedrich Augut II. / August III. (1696 – 1763). Probably, Maria Josepha gave the exceptional object to her uncle, emperor Karl VI. (1685 – 1740) in Vienna. The latter, in turn, gave it to the Kunstkammer were it remained up to recent times.
Medieval Seaports of the Atlantic coast of Spain
Creators: name: Solórzano Telechea, Jesús Angel
Publisher: name: figshare
Year: 2023
Subjects: European history (excl. British, classical Greek and Roman)

description: The aim fo this article is to analyze the role of the seaports of Northern Iberia, as the main nodes of networks between Medieval Iberia and Northern Europe commerce in Middle Ages.
O corpo simbólico masculino
Creators: name: Dourado, Wilson Pereira
Publisher: name: SOPCOM: Associação Portuguesa de Ciências da Comunicação
Year: 2013

description: Fruto de investigações iniciadas para tese de doutoramento na Pontifícia Universidade Católica de São Paulo, na linha de pesquisa em análise das mídias, este trabalho tem por objetivo demonstrar como está hoje sendo representada a imagem do masculino em revistas impressas. Investiga o dilema contemporâneo instalado pela mídia que aponta o narcisismo como traço característico de uma sociedade de consumidores e instala um homem simbólico, fetichizado, com metas e desafios sobre-humanos ditados pelo discurso mediático que promete revelar uma vida saudável e de gozo pleno. Metodologicamente, esse estudo baseia-se na análise dos pôsteres da revista Men’s Health com seu aparato signico que compõe a imagem desse homem tomando como princípio o referencial narcisista veiculado pelos meios de comunicação que transformam o sujeito no seu próprio ideal, em uma dimensão efetivamente simbólica. Intentase analisar alguns padrões discursivos estabelecidos para a construção da imagem desse novo tipo de homem que eram, aparentemente, e até então, característicos do universo feminino.
description: SOPCOM: Associação Portuguesa de Ciências da Comunicação, 2013: 8º SOPCOM: "Comunicação Global, Cultura e Tecnologia"
title: Short note to the inoceramid bivalve Inoceramus pictus concentricoundulatus Tröger, 1967 – holotype and further specimens from the lower Upper Cenomanian of Saxony (Germany)
title: Kurzmitteilung zu der inoceramiden Muschel Inoceramus pictus concentricoundulatus Tröger, 1967 – Holotypus und weitere Exemplare aus dem unteren Oberceno­manium von Sachsen (Deutschland)
Creators: name: Niebuhr, Birgit
Publisher: name: Senckenberg Gesellschaft für Naturforschung
Year: 2020

description: To date, there is a lack of clarity in the literature due to the holotype of the bivalve subspecies Inoceramus pictus concentricoundulatus Tröger, 1967. The specimen of the first erection of the subspecies name by Tröger (1967: 46, pl. 3, fig. 7) from the lower Upper Cenomanian of Saxony, Germany, still exists in the TU Bergakademie Freiberg (holotye FG: 253/379). This I. pictus subspecies rarely occurs; six more specimens are hosted in the Museum für Mineralogie und Geologie in Dresden. All seven specimens from Saxony are shown; the holotype for the first time photographically.
description: Bis heute herrscht in der Literatur Unklarheit über den Holotypen der Muschel-Unterart Inoceramus pictus concentricoundulatus Tröger, 1967. Das Exemplar der Erstaufstellung des Unterartennamens durch Tröger (1967: 46, Taf. 3, Fig. 7) befindet sich in der TU Bergakademie Freiberg (Holotypus FG: 253/379). Diese I.-pictus-Unterart ist selten; sechs weitere Exemplare werden im Museum für Mineralogie und Geologie in Dresden aufbewahrt. Alle sieben Exemplare aus Sachsen werden abgebildet, der Holotyp zum ersten Mal fotographisch.
Yūnānī im Kontext des 19. Jahrhunderts in Südasien
Creators: name: Hopf, Arian
Publisher: name: Masala: Newsletter Virtuelle Fachbibliothek Südasien
Year: 2023

description: Masala: Newsletter Virtuelle Fachbibliothek Südasien, Bd. 9 Nr. 3 (2014)
Universality and the three-body parameter of helium-4 trimers
Creators: name: Naidon, Pascal
name: Hiyama, Emiko
name: Ueda, Masashito
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a system of three helium-4 atoms, which is so far the simplest realistic three-body system exhibiting the Efimov effect, in order to analyse deviations from the universal Efimov three-body spectrum. We first calculate the bound states using a realistic two-body potential, and then analyse how they can be reproduced by simple effective models beyond Efimov's universal theory. We find that the non-universal variations of the first two states can be well reproduced by models parametrized with only three quantities: the scattering length and effective range of the original potential, and the strength of a small three-body force. Furthermore, the three-body parameter which fixes the origin of the infinite set of three-body levels is found to be consistent with recent experimental observations in other atomic species.
description: 7 pages, 9 figures