cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Einfluss der Femtosekundenlaserbearbeitung auf die physikalischen und chemischen Oberflächeneigenschaften von TiAl6V4
Creators: name: Schnell, Georg
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 620 Engineering & allied operations

description: Die vorliegende Arbeit untersucht den Einfluss der Femtosekundenlaserbearbeitung auf die physikalischen und chemischen Oberflächeneigenschaften von TiAl6V4. Der Fokus der Arbeit liegt auf der Untersuchung von Laser-Scanstrategien zur Erzeugung von selbstorganisierten Nano- und Mikrostrukturen sowie der Realisierung von deterministischen Strukturmustern. Dabei stand die Veränderung der Charakteristik der oberflächennahen Schichten und der Grenzfläche des Werkstoffs in Abhängigkeit der Laserbearbeitungsstrategien und des Energieeintrags im Mittelpunkt der Untersuchungen.
An inverse finite element approach to modeling the rat cervical spinal cord : for use in determining the mechanical properties of the grey and white matter
Creators: name: Sharkey, Liam Rhett
Publisher: name: University of British Columbia
Year: 2018

description: There are many cellular and therapeutic treatments for traumatic spinal cord injury (tSCI) that have shown promise in animal models, however, these treatments have been unsuccessful when applied to humans. A possible reason for this discrepancy is that animal model SCIs are well-controlled, whereas human SCIs are heterogeneous in terms of population, severity and mechanism. It is known that the mechanical injury parameters play an important role in dictating the pathophysiology of SCI. However, to fully describe the mechanics of tSCI, it is necessary to understand the mechanical properties of the spinal cord. In order to investigate the mechanical properties of the rat spinal cord, I created a finite element model to simulate experimental contusion SCIs on rats based on research by Bhatnagar et al., and evaluate morphological similarity between computationally predicted and experimentally deformed spinal cords. The model was used to determine the relative stiffnesses of the grey and white matter by iteratively assigning mechanical properties to each tissue, deforming the spinal cord to match the shape of the experimentally deformed cord, and observing the morphological similarity of the predicted and experimentally deformed grey matter shapes. Using a linear elastic, homogeneous, isotropic material model for both tissues examined, I found that for six of the seven spinal cords examined, the best model agreement occurred when the white matter was modeled as 2-3 times stiffer than the grey matter, while each tissue was held at a Poisson's ratio of 0.45. Furthermore, I found that for contusion injuries inflicted upon the mediolateral center of the spinal cord, the model predicted the deformation well, while for off-center contusions, the model was unable to capture the shape of the grey matter on the side contralateral to the contusion location. I demonstrated that the spinal cord white matter appears to be stiffer than the grey matter and that current strategies of modeling spinal cord injury do not adequately capture the complexity of the deformation of the cord as a whole. My research gives further reason to investigate the mechanical properties of the spinal cord for the purpose of computationally modeling spinal cord injury.
Synthesis and characterization of a masked N-heterocyclic phosphinidene (NHP)
Creators: name: Suhrbier, Tim
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 540 Chemistry & allied sciences

description: This thesis summarizes the synthesis and characterization of an unprecedented heterocyclobutane derivative. To assess the biradical character, quantum mechanical computations were carried out. The second part elaborates on the reactivity (LEWIS acids/bases, an isonitrile, carbon monoxide, chalcogens). Notably, the addition of alkenes/alkynes to form phosphiranes/phosphirenes highlights the phosphinidene-type reactivity. In the last part, heavier congeners (As, Sb, Bi) of chlorinated precursors and theoretical investigations of their corresponding reduced heterocycles is discussed.
Optimization and application of a flexible dual arm robot based automation system for sample preparation and measurement
Creators: name: Joshi, Shalaka
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 620 Engineering & allied operations
subject: 621.3 Electrical Engineering, Electronics

description: This dissertation describes the optimization of the implementation of the Yaskawa SDA10F dual-arm robot to carry out routine sample preparation tasks in a life science laboratory such that standard lab equipment can be used and the robot can replace humans in sample preparation process. The existing robot control software is changed to carry out various tasks consecutively without interruption. Robot environment and motions were optimized allowing system expansion, multiple batches of samples are made at a time, increasing throughput. The system was validated with the help of two applications.
Charakterisierung der Leucocyte Immunoglobulin-Like Receptor B4 (LILRB4)- Expression in Mikrogliazellen
Creators: name: Kretzschmar, Jan Felix
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 610 Medical sciences Medicine

description: Ex vivo Mikroglia (MG), Peritonealmakrophagen (PM) und Knochenmarksmonozyten (BMMC) sowie in vitro MG exprimieren LILRB4 auf ihrer Zelloberfläche. Ex vivo MG und BMMC zeigen niedrige , PM hohe Oberflächenexpressionslevel von LILRB4. Primäre MG-Kulturen zeigen im Vgl. zu ex vivo MG vielfach höhere Rezeptorlevel. Es kommt zeitabhängig und durch eine Aktivierung durch LPS oder TGFβRI zu einem signifikanten Anstieg der LILRB4 Oberflächendichte. In BV2 Zellen reguliert die Behandlung mit TGFβ1 signifikant die Lilrb4- Genexpression herunter und blockiert die LPS- induzierte Hochregulierung.
Vaterschaft nach Trennung und Scheidung
Creators: name: Schneider, Julia
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 300 Social sciences

description: Die Dissertation beschäftigt sich mit der Frage, welche Faktoren Einfluss auf die Ausgestaltung der Beziehung zwischen Vater und Kind nach einer Trennung oder Scheidung aus Sicht der Väter nehmen und setzt sich weitestgehend ergebnisoffen mit den Schilderungen und der Lebenswelt der Befragten auseinander. Der Fokus liegt auf den individuellen Aushandlungsprozess der eigenen Vaterschaft in Abhängigkeit von individuellen Ressourcen, Restriktionen sowie deren Deutung.
title: Subjektives Erleben einer affektorientierten Intervention in kritischen Dialogsituationen der HCI
Creators: name: Wahl, Mathias
name: Lange, Julia
name: Rösner, Dietmar
name: Frommer, Jörg
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Die in der Mensch-Computer-Interaktion (HCI) entstehenden Nutzeremotionen erfahren im Zuge

der Entwicklung individuell angepasster technischer Systeme eine immer größer werdende Berücksichtigung.

Um auf gerade in kritischen Dialogsituationen häufig präsente negative Emotionen einzuwirken,

können systemseitig affektorientierte Interventionen eingesetzt werden. Dieser Ansatz wurde schon mehrfach

als effektiv nachgewiesen und bildet die Grundlage dieser Studie, in der Probanden eine alltägliche

Planungsaufgabe in Zusammenarbeit mit einem simulierten Companion-System bewältigten. In Wizardof-

Oz-Experimenten wurde den Probanden in einer kritischen Dialogsituation eine empathische und interpretative

Hilfe zur Verfügung gestellt. In anschließenden Nutzerinterviews wurden die Probanden unter

Zuhilfenahme des Interpersonal Process Recall nach ihrem Erleben der nach psychotherapeutischen Wirkprinzipien

entworfenen affektorientierten Intervention befragt. Mit der Anwendung dieser qualitativen

Forschungsmethodik wurden die bisherigen Ansätze zur Untersuchung systemseitiger Interventionen um

eine Komponente subjektiver Sinnzuschreibung erweitert und so Einsichten in das Erleben und die Konzeptualisierungen

der Probanden bezüglich der Intervention gewonnen. Fünf abgeleitete Themen geben

Hinweise auf zu berücksichtigende Gestaltungsprinzipien empathischer Nutzerunterstützungen. Dabei

wurde sowohl die Wichtigkeit der Beachtung etablierter Usability Prinzipien als auch die Wichtigkeit der

individuellen Angepasstheit systemseitiger Interventionen deutlich.
Coffee Lecture Slides: Wissensmanagement als Teil des Forschungsdatenmanagements
Creators: name: Assmann, Cora
Publisher: name: Zenodo
Year: 2022
Subjects: research data management
Forschungsdatenmanagement
Wissensmanagement
knowledge management
rdm
fdm

description: English: Coffee Lecture Slides: Wissensmanagement als Teil des Forschungsdatenmanagements (Coffee Lecture: 26.01.2022)  Good knowledge management is essential to maintain a good quality of work processes such as data management in the face of constant personnel changes in the scientific system. The Coffee Lecture aims to raise awareness for the introduction of knowledge management and to show how it also contributes to better research data management. Video: Link ------------------------------------------------------ Deutsch: Gutes Wissensmanagement ist essentiell um bei stetigen Personalwechsel im Wissenschaftssystem eine gute Qualität der Arbeitsprozesse wie u. a. das Datenmanagement aufrecht zu erhalten. Die Coffee Lecture möchte für die Einführung eines Wissensmanagements sensibleren und zeigen wie dieses auch das Forschungsdatenmanagement unterstützen kann. Video: Link
Entwicklung und Validierung eines EIT-Gurtes sowie klinischer Parameter für die Elektrische Impedanztomografie
Creators: name: Waldmann, Andreas Daniel
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 500 Natural sciences
subject: 610 Medical sciences Medicine

description: Die entwickelten EIT-Gurte sind spezifisch auf die Anatomie der jeweiligen Patientenpopulation abgestimmt, sind hautverträglich und ermöglichen es, stabile und reproduzierbare EIT-Daten zu erfassen. Sie erfüllen somit die technischen Grundvoraussetzungen für den möglichen klinischen Einsatz der EIT. Der neu entwickelte EIT-Parameter, SilentSpaces, ermöglicht eine Darstellung von potenziell überdehnten sowie kollabierten Lungenbereichen. Basierend auf den SilentSpaces kann der Kliniker jetzt patientenspezifisch die Beatmungseinstellungen optimieren.
In vitro Untersuchung der Auswirkungen von Low intensity focused ultrasound (LIFU) auf die Spontanaktivität der Pyramidenzellen der hippocampalen CA1-Region
Creators: name: Becker, Juliane Sophie
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 610 Medical sciences Medicine

description: Mittels In-vitro-Experimenten an Ratten-Hippocampus-Schnitten konnte gezeigt werden, dass die Applikation von LIFU (hier: 480 mW/cm²) variierender Frequenz- und Zeitparameter die spontane Aktivität der Pyramidenzellen der hippo-campalen CA1-Region maßgeblich beeinflusst. Hierbei ändern sich sowohl die extrazellulären als auch die intrazellulären Parameter signifikant.
„So schnell wie möglich…“?
Creators: name: Lütjohann, Marcel
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 900 History
subject: 943 General history of Europe Central Europe Germany

description: Eine Regierung, die sich und ihr Land selbst abschaffte. Die Rede ist von dem am 12. April 1990 vor der ersten frei gewählten Volkskammer vereidigtem Kabinett, dessen zentraler Auftrag lautete: innen- und außenpolitische Vorbereitung der deutschen Einheit und Abwicklung der DDR. Doch wie schaffte es die letzte Regierung des Landes, sich überflüssig zu machen? Jene Frage wird durch diese Arbeit auch durch die Verwendung von bisher nicht edierten Quellen beantwortet, was neue Einblicke in die Denkweise des einzigen demokratischen Kabinetts der DDR liefert.
A multiscale analysis of forming induced wrinkles in woven composite preforms
Creators: name: Hosseini, Abbas
Publisher: name: University of British Columbia
Year: 2018

description: A multi-scale analysis of forming induced wrinkles in woven composite preforms is conducted. The main objective of the present thesis is to propose an analytical model for the prediction of a class of forming induced wrinkles. In this research, wrinkling phenomenon in woven fabrics is divided into two distinct classes based on the nature and mechanism of formation, namely shear wrinkling (i.e., developed as a result of large shear deformation) and non-shear wrinkling (i.e., developed due to longitudinal contraction of the length of the fabric strip). Shear wrinkling as one of the most critical defects in the draping of woven fabrics is investigated in this study. To develop an analytical model for the prediction of shear wrinkling, an in-depth investigation is conducted to scrutinize the mesoscale mechanisms of woven fabrics during shear deformation. It is revealed that shear of woven fabrics occurs through two distinct deformation modes (i.e., trellising mode and pure multi-scale shear mode) depending on the boundary conditions applied to the fabric. In accordance with the deformation mode of woven fabrics, analytical equations are derived to predict the onset of shear wrinkling of the fabrics. Experimental investigations are conducted to assess the accuracy of the analytical model. Afterward, the analytical model for the prediction of shear wrinkling is implemented into ABAQUS Finite Element (FE) package as wrinkling indicator/predictor to improve the accuracy of the FE results. Furthermore, a parametric study is carried out to determine the effect of fabric and process parameters on the resistance of woven fabrics against wrinkling.
Untersuchungen zur Synthese und Reaktivität von O- sowie N-substituierten Alkinen in ihren Komplexen
Creators: name: Timmermann, Christopher
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 540 Chemistry & allied sciences

description: Das Konzept der Donor-substituierten Alkine als potentielle Brückenliganden sollte um die Elemente Sauerstoff und Stickstoff erweitert werden. Die Eigenschaften solcher Liganden konnte im Rahmen der Arbeit genauer beschrieben werden. Durch eine Etherspaltung am Alkin konnte unter anderem die Bildung eines Ketenyl-Komplexes beobachtet werden, welcher unter Zugabe eines Isonitrils zu einen Oxametallazyklus über eine wandernde Insertion reagiert. Koordinierte N,N-Donor-Alkine neigen bei der Zugabe eines weiteren Metalls zu einer Spaltung, welche die Bildung einer Metall-Metall-Bindung ermöglicht.
null Gesichtsschädelwachstum von unbehandelten Probanden mit Angle-Klasse II/1 Gebissanomalie mittels Tensoranalyse
Creators: name: Möller, Kay
Publisher: name: Universität Rostock
Year: 2019
Subjects: subject: 610 Medical sciences Medicine

description: Longitudinale Wachstumsveränderungen im Gesichtsschädelbereich (Fernröntgenseitenbild) von unbehandelten Probanden mit Angle-Klasse-II/1 Gebissanomalie (49; 25 männlich, 24 weiblich) und unbehandelten Probanden mit normaler Okklusion (31; 16 männlich, 15 weiblich) unter Berücksichtigung der individuellen skelettalen Reife (CVM-Methode) vom prä- bis zum postepuberalen Stadium unter Verwendung der Rostocker Tensoranalyse.
Schmeckvermögen vor und nach Cochlea Implantation in Abhängigkeit von der Chorda tympani Manipulation
Creators: name: Drewniak, Marcus Peter
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 610 Medical sciences Medicine

description: Das Ziel dieser Dissertation war, das Schmeckvermögen vor und nach Cochlea Implantation in Abhängigkeit von der CTN-Manipulation zu untersuchen. In der vorliegenden Studie ließ sich nachweisen, dass Schmeckstörungen prä- und postoperativ auftreten. Im postoperativen Verlauf zeigte sich ein temporärer signifikanter Schmeckverlust der operierten Seite. Bleibende Symptome sind 2 Jahre nach Operation sehr selten. Zu den Hauptsymptomen zählen Schmeckverlust und Mundtrockenheit. Zusammenhänge zwischen Ausmaß der CTN-Schädigung und Schmecktestung sind darstellbar.
Vergleichende Untersuchung eines standardisiert hergestellten, allogenen Wachstumsfaktorextraktes
Creators: name: Sander, Frank
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 610 Medical sciences Medicine
subject: 796 Athletic & outdoor sports & games

description: Ziel dieser Arbeit war es, ein standardisiert hergestelltes Wachstumsfaktorpräparat aus allogenen Thrombozytenkonzentraten mit der Benennung PRP-Pulver (Fa. DOT GmbH, Rostock, DEU) im Vergleich zu zwei herkömmlichen PRP-Herstellungsmethoden zu untersuchen. Diese Studie zeigt eine mögliche Methode zur besseren Standardisierung von PRP durch Erstellen eines direkt verwendbaren und lagerfähigen PRP-Pulvers. Die Wachstumsfaktorzusammensetzung des PRP-Pulvers weist hauptsächlich Wachstumsfaktorkonzentrationen im oberen Bereich auf und ist mit "klassischen" etablierten PRP-Produkten vergleichbar.
Analyse der endoskopischen Vakuumtherapie am unteren Gastrointestinaltrakt
Creators: name: Janisch, Florian
Publisher: name: Universität Rostock
Year: 2019
Subjects: subject: 610 Medical sciences Medicine

description: Dei Anastomoseninsuffizienz ist schwere Komplikation kolorektaler Resektionen. Bei subperitonealer Insuffizienz ist die endoskopische Vakuumschwammtherapie (EVT) ein vielversprechender Therapieansatz. Wir untersuchten in dieser retrospektiven Arbeit die bisher größte Kohorte (n=40) von Patienten, welche mit einer EVT behandelt wurden auf mögliche Einflussfaktoren auf die Therapiedauer. Wir konnten mit einem Erfolg in 83% und einer medialen Behandlungsdauer von 20 Tagen eine gute Wirksamkeit der EVT zeigen. Die Behandlungsdauer wurde durch neoadjuvante Therapie verlängert.
Klinisches und radiologisches 4-Jahres-Outcome nach operativer Versorgung von dislozierten intraartikulären Kalkaneusfrakturen mit einem neuartigen Kalkaneusnagel vs. herkömmlicher Plattenosteosynthese
Creators: name: Hüdepohl, Jonas
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 610 Medical sciences Medicine

description: Zur Etablierung einer optimalen Therapie der intraartikulären dislozierten Kalkaneusfraktur wurde in dieser Arbeit der neuartige Calcanail® mit der herkömmlichen winkelstabilen Plattenosteosynthese verglichen. Hauptfokus dieser Untersuchung lag auf der postoperativen Komplikationsrate, der Funktion, die mittels AOFAS-Hintfoot-Score und dem r-FFI evaluiert wurde, und der Entwicklung einer Subtalargelenksarthrose. Der Kalkaneusnagel ermöglicht eine komplikationsarme Versorgung mit schneller beruflicher Wiedereingliederung bei gleichzeitig guter Funktionalität und geringerer Arthroseentwicklung.
Abkürzungsverzeichnis
Creators: name: Redaktion, Die
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Schmerz und Freude der Mütter
Creators: name: Gallistl, Bernhard
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
La nuova cronologia della „Villa dei Papiri“ a Ercolano e le sorti della biblioteca di Filodemo
Creators: name: Dorandi, Tiziano
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Dedikation als Mittel taktischen Geschicks
Creators: name: Hogenmüller, Boris
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Menschen und Tiere in den Kaiserviten Suetons
Creators: name: Fögen, Thorsten
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Rhetorik und Philosophie bei Fronto und Mark Aurel – Konflikt oder Konkurrenz?
Creators: name: Wenskus, Otta
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
spätantikes Mesomedes-Corpus mit musikalischer Notation
Creators: name: Pöhlmann, Egert
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Epik des Exzeptionellen
Creators: name: Schirner, Rebekka
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Titelei
Creators: name: Redaktion, Die
Publisher: name: Würzburger Jahrbücher für die Altertumswissenschaft
Year: 2023

description: Würzburger Jahrbücher für die Altertumswissenschaft, [N.F.] Bd. 41 (2017): Würzburger Jahrbücher für die Altertumswissenschaft
Biodiversity, agricultural productivity, and landscape context in organic vs conventional rice paddy wetlands in Kerala, India
Creators: name: Thaikkattil Louis, Libin
Publisher: name: University of British Columbia
Year: 2018

description: Agriculture is the most extensive global land use and a leading cause of biodiversity loss. Organic farming is often promoted as a means of reducing agricultural impacts on biodiversity by reducing or avoiding chemical fertilizers and pesticides, and can result in a 30 percent increase in biodiversity for some species in some systems. A potential trade-off is that organic agriculture can lower crop yields, thereby requiring a greater land area to meet crop production goals. In this study, I examined whether forest cover surrounding rice wetlands can reduce the trade-off between biodiversity and productivity via comparison of paired organic and conventional farms. I compared abundance, Simpson diversity, and rarefied richness of amphibians, and abundance of arthropods in organic and conventional rice wetlands in four districts in Kerala, southern India, from July to October of 2016. I selected 31 organic rice fields and paired each with a nearby conventional field. Pairs were located to maximize the variation in forest cover in the landscape surrounding the fields. Farmers provided data on mean rice yields of each farm. Amphibians were significantly more abundant and diverse in organic fields, and species composition differed from those of conventional fields. Arthropods were more abundant in organic fields. While mean yield (tons of rice/hectare) of organic farms was significantly lower than in conventional farms, landscape context ameliorated the trade-off between productivity and biodiversity. In organic fields surrounded by more forest patches, rice yields did not decrease as much compared to the landscapes with less forest, while the increase in biodiversity (as compared to nearby conventional agriculture) was not as large. My results suggest that forested landscapes reduce the trade-off between biodiversity and productivity in rice fields in Kerala. These results could aid in designing agricultural ecosystems that maximize biodiversity benefits. For example, promoting more diversified tree-based agroecosystems, and protecting remaining uncultivated areas in the landscape could improve farmland biodiversity while minimizing the impacts to the agricultural productivity of the landscape. Furthermore, in intensively managed landscapes comprised of cropland and urban land cover, organic farming may have a larger effect on biodiversity than in landscapes with more forest cover.
Hysteresis, spin transitions, and magnetic ordering in the fractional quantum Hall effect
Creators: name: Cho, Hyun-Ick
name: Kang, W.
name: Campman, K. L.
name: Gossard, A. C.
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Hydrostatic pressure; Spin transitions; Magnetic ordering
subject: 530 Physik
subject: 73.40.Hm

description: We have studied the development of metastable properties associated with a nearly spin-degenerate two-dimensional electron system. Application of large hydrostatic pressure significantly reduces the g-factor experienced by electrons in GaAs/AlGaAs heterostructure, and various fractional quantum Hall effect (FQHE) states are found to undergo transition to a spin-unpolarized ground state. In case of even numerator FQHE states, the spin transitions are accompanied by hysteresis and nonlinearity in the magnetotransport. These results strongly support a recent theory of quantum Hall magnetism in which competition between spin-polarized and spin-unpolarized ground states leads to an ordered phase that exhibits ferromagnetic correlation.
Solarpunk in Bibliotheken #vBIB23
Creators: name: Bemme, Jens
Publisher: name: Zenodo
Year: 2023

description: Ideensammlung der Session Solarpunk in Bibliotheken, https://de.wikiversity.org/wiki/VBIB/vBiB23/Solarpunk im Pad https://etherpad.wikimedia.org/p/Solarpunk während der Onlinekonferenz #vBIB23 am 7. Dezember 2023
Sample Analysis Using Individual Omic Techniques and Data Outputs
Creators: name: Najdekr, Lukáš
name: Niehues, Anna
name: de Visser, Casper
name: Ekberg, Sara
name: Stanková, Jarmila
name: García Bermejo, Laura
name: Fernández, Val
name: Conde, Elisa
name: Toth, Reka
Publisher: name: Zenodo
Year: 2023
Subjects: multi-omics
multiomics
metabolomics
proteomics
transcriptomics
genomics
targeted metabolomics
untargeted lipidomics
epigenomics
mRNAseq
metDNAseq
WGS
aCGH
microRNAseq
microRNAqRT-PCR
multiomic data integration
batch analysis correction
univariate analysis
FAIRification
reference values
missing value imputation
sample preparation
omic technologies

description: The biological samples from the Czech cohort (n=127) were analysed by individual “omics” approaches (genomics, transcriptomics, epigenomics, proteomics, metabolomics) at the particular EATRIS sites across Europe. Study subjects were informed and consented to provision of the data related to their person for research and development purposes to existing and future research partners of IMTM in an anonymous form (pseudonymized, from the definition of GDPR, while only IMTM holds the additional information).

The preparation of samples was performed according to the standard operation protocols collected and presented in D1.1. The generated data were analysed using protocols applied for the data analyses of single omics. Data were further evaluated, and statistical analyses were performed.
Nonlinear parametric oscillations of viscoelastic plate of variable thickness
Creators: name: Mirsaidov, Mirziyod
name: Abdikarimov, Rustamkhan
name: Vatin, Nikolai
name: Zhgutov, Vladimir
name: Khodzhaev, Dadakhan
name: Normuminov, Bakhodir
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2018
Subjects: subject: thin-walled structures
subject: plates
subject: shells
subject: variable thickness
subject: periodic load
subject: dynamic instability domain
subject: тонкостенные конструкции
subject: пластины
subject: оболочки
subject: переменная толщина
subject: периодическая нагрузка
subject: область динамической неустойчивости

description: Isotropic viscoelastic plates of variable thickness under the effect of a uniformly distributed vibration load applied along one of the parallel sides, resulting in parametric resonance (with certain combinations of eigenfrequencies of vibration and excitation forces) are considered in the paper. It is believed that under the effect of this load, the plates undergo the displacements (in particular, deflections) commensurate with their thickness. Geometrically nonlinear mathematical model of the problem of parametric oscillations of a viscoelastic isotropic plate of variable thickness is developed using the classical Kirchhoff-Love hypothesis. Corresponding nonlinear equations of vibration motion of plates under consideration are derived (in displacements). The technique of the nonlinear problem solution by applying the Bubnov-Galerkin method at polynomial approximation of displacements (and deflection) and a numerical method that uses quadrature formula are proposed. The Koltunov-Rzhanitsyn kernel with three different rheological parameters is chosen as a weakly singular kernel. Parametric oscillations of viscoelastic plates of variable thickness under the effect of an external load are investigated. The effect on the domain of dynamic instability of geometric nonlinearity, viscoelastic properties of material, as well as other physical-mechanical and geometric parameters and factors (initial imperfections of the shape, aspect ratios, thickness, boundary conditions, excitation coefficient, rheological parameters) are taken into account. The results obtained are in good agreement with the results and data of other authors. The convergence of the Bubnov-Galerkin method is verified.
Adaptation of Instrumental SOP for Colour of Cassava Fufu Dough Using Chromameter
Creators: name: CHIJIOKE, UGO
Publisher: name: Zenodo
Year: 2025

description: Fufu dough, a staple food in many African countries, has its quality significantly influenced by its color. This affects consumer’s preference and marketability. The assessment of cassava fufu color has been biased, relying on the traditional method of visual inspection, which can lead to inconsistencies. Therefore, the research focuses on the adaptation of an instrumental standard operating procedure (SOP) for the color measurement of cassava fufu dough using a Minolta CR-400 chromameter to provide objective and reproducible color measurements in the CIELAB color space, capturing lightness (L*), red-green (a*), and yellow-blue (b*) parameters. In this study, 40 cassava genotypes were processed into fufu following the standard operating procedure developed by RTBFoods. The color of the fufu was measured at different temperatures (hot and cold) using the chromameter. Statistical analyses, including Analysis of Variance (ANOVA) and Principal Component Analysis (PCA), were conducted to evaluate the effectiveness of the device in discriminating fufu colors and assessing color intensity variations based on temperature differences. In conclusion, chromameter can accurately determine the color of fufu dough without bias.
Rationalizing legislative rule change : three cases of rule change in the Canadian House of Commons
Creators: name: Bosley, Mitchell
Publisher: name: University of British Columbia
Year: 2018

description: What stops governments from unilaterally changing the rules of parliament? I argue that governing parties fail to unilaterally restrict the rights of the legislative minority due to the expectation that their actions will be perceived negatively by the electorate. Through reference to three episodes of legislative rule change in Canadian history, I show with formal modelling that expectations of audience costs can reduce the likelihood of a government implementing rule changes unilaterally. Using newspaper coverage of the debates over rule change as a measure of audience costs, I show that the government ignores the opposition when audience costs are low and tries to compromise when audience costs are high.
SOME ENGINEERING PROPERTIES OF UDZUNGWA SCARP SOIL
Creators: name: Maregesi, Gerald
Publisher: name: figshare
Year: 2023
Subjects: Civil geotechnical engineering

description: The Udzungwa scarp is prone to landslide, slope instability, and severe erosion brought about by several interrelated factors like rainfall, soil geological formation, geomorphological feature of the slope and gross engineering properties of the soil available within the scarp. In this paper, some engineering properties of soil available within the scarp are discussed. Various soil engineering characteristics, erosion, and slope stability problems are pinpointed and discussed. This paper is based on the study carried out during pre-construction, construction, and post-construction investigation of 16 Km of Kihansi Dam Access road, which is traversing the Udzungwa escarpment.
A Large Number of z > 6 Galaxies around a QSO at z = 6.43: Evidence for a Protocluster?
Creators: name: Utsumi, Yousuke
name: Goto, Tomotsugu
name: Kashikawa, Nobunari
name: Miyazaki, Satoshi
name: Komiyama, Yutaka
name: Furusawa, Hisanori
name: Overzier, Roderik
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: QSOs have been thought to be important for tracing highly biased regions in the early universe, from which the present-day massive galaxies and galaxy clusters formed. While overdensities of star-forming galaxies have been found around QSOs at 26 is less clear. Previous studies with HST have reported the detection of small excesses of faint dropout galaxies in some QSO fields, but these surveys probed a relatively small region surrounding the QSOs. To overcome this problem, we have observed the most distant QSO at z=6.4 using the large field of view of the Suprime-Cam (34' x 27'). Newly-installed CCDs allowed us to select Lyman break galaxies (LBG) at z~6.4 more efficiently. We found seven LBGs in the QSO field, whereas only one exists in a comparison field. The significance of this apparent excess is difficult to quantify without spectroscopic confirmation and additional control fields. The Poisson probability to find seven objects when one expects four is ~10%, while the probability to find seven objects in one field and only one in the other is less than 0.4%, suggesting that the QSO field is significantly overdense relative to the control field. We find some evidence that the LBGs are distributed in a ring-like shape centered on the QSO with a radius of ~3 Mpc. There are no candidate LBGs within 2 Mpc from the QSO, i.e., galaxies are clustered around the QSO but appear to avoid the very center. These results suggest that the QSO is embedded in an overdense region when defined on a sufficiently large scale. This suggests that the QSO was indeed born in a massive halo. The central deficit of galaxies may indicate that (1) the strong UV radiation from the QSO suppressed galaxy formation in its vicinity, or (2) that star-formation closest to the QSO occurs mostly in an obscured mode that is missed by our UV selection.
description: Accepted for publication in ApJ. 11 pages, 8 figures
Influence of short-range ordering on roughness of (AlGa)As interfaces studied with cross-sectional scanning tunneling microscopy
Creators: name: Reusch, T. C. G.
name: Wenderoth, M.
name: Heinrich, A. J.
name: Engel, K. J.
name: Quaas, N.
name: Sauthoff, K.
name: Ulbrich, R. G.
name: Weber, E. R.
name: Uchida, K.
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 530 Physik

description: Cross-sectional scanning tunneling microscopy was used to identify individual Al atoms on cleaved surfaces of two sets of (AlGa)As heterostructure samples grown with metalorganic vapor-phase epitaxy and molecular-beam epitaxy. We determined the average Al concentration profile perpendicular to the GaAs–(AlGa)As interfaces. Based on former investigations of short-range ordering in (AlGa)As bulk material grown with metalorganic vapor-phase epitaxy, we conclude that short-range ordering during growth of the interfacial layers contributes significantly to the observed interface roughness.
Developing an augmented reality app in Secwepemctsín in collaboration with the Splatsin Tsm7aksaltn (Splatsin Teaching Centre) Society
Creators: name: Lacho, David Dennison
Publisher: name: University of British Columbia
Year: 2018

description: In this thesis, I describe over two years of collaboration and engagement between Splatsin First Nation Elders, community members, staff that work at the Splatsin Tsm7aksaltn (Splatsin Teaching Centre) Society, and myself, a Master’s student at UBC Okanagan. In particular, I describe how we have developed an augmented reality app for language revitalization in Splatsin’s dialect of Secwepemctsín. In this project, I drew on Indigenous methodologies, the community-based language research model, and digital ethnography as theory to conduct my research. Specifically, this involved including community members as community research partners. By forming a research team that involves community members as researchers, this project respects community members’ knowledge, control, and ownership of the research project and approaches relationship and trust building as guiding the research process. This ensured that the Splatsin Tsm7aksaltn retained ownership and control of the project at all stages of the research. Secwepemctsín is an endangered language. In total, there are less than one hundred speakers of the language. In addition, Splatsin’s dialect of Secwepemctsín only has a handful of speakers, most of whom are approaching ninety years old. The Splatsin Tsm7aksaltn (Splatsin Teaching Centre) Society, a registered not-for-profit organization for documenting and teaching Splatsin’s language and culture, often uses technology for language revitalization. As such, my community research partners and I developed an app in Secwepemctsín that draws on stories from a community play, called Tuwitames (she/he is growing up). These stories, called stsptakwla, convey important lessons and cultural knowledge and also draw attention to assimilation practices of Residential Schools and the Sixties Scoop. Through my participant observation in the community, interviews, community meetings, and online questionnaires, community research partners and community members guided the direction and development of the app, and we tested the app in the community. Our shared research project highlights respect, relevance, reciprocity, and responsibility by establishing collaborative research goals, and can be a model for other research projects that involve developing digital technology for communities engaged in endangered language revitalization.
In-plane Gate Single Electron Transistor Fabricated by AFM Lithography
Creators: name: Lüscher, S.
name: Fuhrer, A.
name: Held, R.
name: Heinzel, Thomas H.
name: Ensslin, Klaus
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 530 Physik
subject: 73.23 HK, 85.40 Ux, 85.30 Vx, 85.40 Hp

description: Coulomb blockade is observed in semiconductor quantum dotsfabricated by scanning probe lithography. We demonstrate thatby combining top gates with in-plane gates, the lithographicshape of a dot can be transferred into the electron gas withhigh accuracy. Furthermore, by applying voltages to the in-plane gates, the number of electrons on the dot can be changedby more than 70 without changing its shape. Transportmeasurements in high magnetic fields and with positive topgate voltages applied indicate that the potential walls of thenanostructure can be made very steep.
Non-intersecting squared Bessel paths: critical time and double scaling limit
Creators: name: Kuijlaars, A. B. J.
name: Martinez-Finkelshtein, A.
name: Wielonsky, F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the double scaling limit for a model of $n$ non-intersecting squared Bessel processes in the confluent case: all paths start at time $t=0$ at the same positive value $x=a$, remain positive, and are conditioned to end at time $t=1$ at $x=0$. After appropriate rescaling, the paths fill a region in the $tx$--plane as $n\to \infty$ that intersects the hard edge at $x=0$ at a critical time $t=t^{*}$. In a previous paper (arXiv:0712.1333), the scaling limits for the positions of the paths at time $t\neq t^{*}$ were shown to be the usual scaling limits from random matrix theory. Here, we describe the limit as $n\to \infty$ of the correlation kernel at critical time $t^{*}$ and in the double scaling regime. We derive an integral representation for the limit kernel which bears some connections with the Pearcey kernel. The analysis is based on the study of a $3\times 3$ matrix valued Riemann-Hilbert problem by the Deift-Zhou steepest descent method. The main ingredient is the construction of a local parametrix at the origin, out of the solutions of a particular third-order linear differential equation, and its matching with a global parametrix.
description: 53 pages, 15 figures
Quantum Hall Ferromagnetism in a Two-Dimensional Electron System
Creators: name: Eom, J.
name: Cho, Hyun-Ick
name: Kang, W.
name: Campman, K. L.
name: Gossard, A. C.
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 530 Physik

description: Experiments on a nearly spin degenerate two-dimensional electron system reveals unusual hysteretic and relaxational transport in the fractional quantum Hall effect regime. The transition between the spin-polarized (with fill fraction nu = 1/3) and spin-unpolarized (nu = 2/5) states is accompanied by a complicated series of hysteresis loops reminiscent of a classical ferromagnet. In correlation with the hysteresis, magnetoresistance can either grow or decay logarithmically in time with remarkable persistence and does not saturate. In contrast to the established models of relaxation, the relaxation rate exhibits an anomalous divergence as temperature is reduced. These results indicate the presence of novel two-dimensional ferromagnetism with a complicated magnetic domain dynamic.
Semiconductor nanostructures with short depletion length and stacked gates, patterned with an atomic force microscope
Creators: name: Heinzel, Thomas H.
name: Held, R.
name: Lüscher, S.
name: Ensslin, Klaus
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Atomic force microscope; Semiconductor nanostructures; Nanolithography
subject: 530 Physik
subject: 07.79.Lh; 73.20.Dx; 81.05.Ed

description: We have investigated the electronic properties of the confining potentials obtained by oxidizing the surface of Ga[Al]As heterostructures with an atomic force microscope. From magnetotransport measurements on quantum wires at liquid-helium temperatures we find an extremely small lateral depletion length of (15±5) nm as well as a specularity of the boundary scattering above 95%. Furthermore, we demonstrate that this patterning technique for in-plane gates can be combined with top gate electrodes. Sufficiently thin top gates consisting of a suitable material can be patterned as well with an atomic force microscope, and the top gate structures can be aligned with respect to the in-plane gates.
Evidence of Luttinger liquid behavior in GaAs/AlGaAs quantum wires
Creators: name: Rother, Martin
name: Deutschmann, R. A.
name: Wegscheider, Werner
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Quantum wires; Luttinger liquids; Ballistic transport
subject: 530 Physik
subject: 73.20.Dx; 73.20.Mf; 73.23.Ad; 73.50.Jt; 73.61.Ey

description: We present low-temperature measurements of the ballistic transport in high-quality quantum wires. As the Fermi energy is varied, the conductance of these wires exhibits quantized plateaus at values lower than integer multiples of 2e2/h. We observe Luttinger liquid power laws in the temperature dependence of the plateau conductances as well as in the non-linear current–voltage characteristics. From these power laws we extract the Luttinger liquid scaling exponent αN as a function of the Fermi energy and the number of occupied subbands.
Spin-dependent exchange and correlation effects on the orbital magnetization of two-dimensional electron systems
Creators: name: Meinel, I.
name: Grundler, D.
name: Hengstmann, T.
name: Heyn, Christian
name: Heitmann, Detlef
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: de Haas–van Alphen effect; Quantum Hall ferromagnet; Skyrmions
subject: 530 Physik
subject: 73.40.Hm; 73.20.Dx; 74.80.Dm; 74.50.+r; 75.20−g; 75.30.Cr

description: We have investigated the orbital magnetization of tunable two-dimensional electron-systems (2DES) in GaAs/AIGaAs-heterostructures in the magnetic quantum limit using a high-sensitive superconducting susceptometer. In particular we have studied the magnetization at filling factor ν=1, where the 2DES forms the quantum Hall ferromagnet. We extract from our data that the orbital magnetic moment is strongly enhanced at low temperatures T by spin-dependent exchange effects. Temperature dependent measurements show that in addition correlation effects dominate the excited states of the many-body system.
Berylliosis in a 56-year-old welder
Creators: name: Loss, Matthew
name: McCauley, Graeme
name: Carlsten, Chris
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: A 56-year-old female presented to her family doctor with insidious shortness of breath that had progressed over several months, from exertional dyspnea to shortness of breath at rest. She had no fever, night sweats, weight loss nor hemoptysis, and was otherwise asymptomatic. At the time of presentation, her medical history included sleep apnea and a mood disorder, which was being treated with a serotonin–norepinephrine reuptake inhibitor. She had never smoked.
Ultrafast Optical Spectroscopy of Large-Momentum Excitons in GaAs
Creators: name: Göger, G.
name: Betz, M.
name: Leitenstorfer, A.
name: Bichler, Max
name: Wegscheider, Werner
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 530 Physik
subject: 71.35.Cc, 71.36.+c, 72.15.Lh, 78.47.+p

description: Highly energetic excitons with wave vectors much larger than that of an absorbed photon are excited in thin GaAs films. We observe propagation beats between three polariton modes up to 300 meV above the absorption edge employing femtosecond transmission spectroscopy. The dispersion relations of the coherent excitations are measured. Ultrafast exciton damping via scattering with nonequilibrium carriers and with phonons is investigated. The dynamics is found to deviate strongly from the relaxation of free carriers. Theoretical simulations are in quantitative agreement with the data.
Hysteresis and first-order phase transition in the two-dimensional electron gas
Creators: name: Piazza, Vincenzo
name: Pellegrini, Vittorio
name: Beltram, Fabio
name: Wegscheider, Werner
name: Bichler, Max
name: Jungwirth, Tomás
name: McDonald, Allan H.
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Quantum hall effect; Ferromagnetism; Hysteresis
subject: 530 Physik
subject: 75.60.−d; 75.30.Gw

description: We report experimental evidence of the first-order phase transitions in the two-dimensional electron gas formed in a gated wide GaAs/AlGaAs quantum well at even-integer quantum-Hall states. At the filling factor values of ν=2,4 and low temperatures, crossing of Landau levels through the application of the gate bias yields a suppression of the quantum-Hall-state excitation gap and hysteretical behaviour of the diagonal resistivity in up and down sweeps of the magnetic field. Detailed many-body calculations indicate the occurrence of a first-order phase transition and allow the determination of the exact properties of the electron ground states involved in the transition.