Theoretical study of interacting electrons in one dimension - ground states and experimental signatures

This dissertation focuses on a theoretical study of interacting electrons in one dimension. The research elucidates the ground state (zero temperature) electronic phase diagram of an aluminum arsenide quantum wire which is an example of an interacting one dimensional electron liquid. Using one dimensional field theoretic methods involving abelian bosonization and the renormalization group we show the existence of a spin gapped quantum wire with electronic ground states such as charge density wave and singlet superconductivity. The superconducting state arises due to the unique umklapp interaction present in the aluminum arsenide quantum wire bandstructure discussed in this dissertation. It is characterized by Cooper pairs carrying a finite pairing momentum. This is a realization of the Fulde-Ferrell-Larkin- Ovchinnikov state which is known to lead to inhomogeneous superconductivity. The dissertation also presents a theoretical analysis of the finite temperature single hole spectral function of the one dimensional electron liquid with gapless spin and charge modes (Luttinger liquid). The hole spectral function is measured in angle resolved photoemission spectroscopy experiments. The results predict a kink in the effective electronic dispersion of the Luttinger liquid. A systematic study of the temperature and interaction dependence of the kink provides an alternative way to detect spincharge separation in one dimensional systems where the peak due to the spin part of the spectral function is suppressed.Comment: Dissertation, Purdue University (2007

Blended e-learning skeleton of conversation: improving formative assessment in undergraduate dissertation supervision

The supervision of undergraduate student dissertations is an area in need of research. Although some studies have already addressed this, these are primarily based on academic staff responses. This study contributes to knowledge by gathering the responses of students and focusing on formative electronic assessment. Data was collected using a student focus group and student questionnaire. The findings suggest that good supervisor-student communication is crucial to the supervision process and a number of students felt unhappy with this aspect. It is suggested that to improve the undergraduate student dissertation experience, a combination of face-to-face and electronic formative assessment is used. In addition, the Blended E-learning Skeleton of Conversation model provides a sound theoretical framework that could guide supervisors and students in the supervision process. This model is advocated for use in dissertation module design and in supervisor development

Scholarly journal access in academic libraries:issues for future development

As academia progresses towards the 21st century, increases in student numbers, distance learning, changes in copyright licensing and lack of funding means that academic institutions have to look more closely at the use of electronic resources in order to meet these challenges. The "wired campus" and "virtual university" mean more users looking for electronic resources and increased pressure on libraries to provide these services. The development of electronic journals in the early 1990s and the onset of electronic publishing appeared to be a solution to the problem. Journals could be stored electronically thereby saving space, the risk of lose, theft or damage is lessened and costs where significantly reduced. Electronic journals have become an increasingly important part of academic library collections, however they have not proved to be the panacea the profession hoped for. Electronic journal useage has created a new set of issues such as archiving, copyright, cataloguing, site licensing, remote access, hardware requirements and journal design. There are many stakeholders involved in the selection of electronic journals within academic libraries from librarians, to users and publishers. This paper attempts to raise awareness of some of the issues which will have to be considered if scholarly electronic journal publishing is to develop over the next decade. The content and ideas presented in the paper are derived from research undertaken in the area for a student Masters dissertation

Neuro-electronic technology in medicine and beyond

This dissertation looks at the technology and social issues involved with interfacing electronics directly to the human nervous system, in particular the methods for both reading and stimulating nerves. The development and use of cochlea implants is discussed, and is compared with recent developments in artificial vision. The final sections consider a future for non-medicinal applications of neuro-electronic technology. Social attitudes towards use for both medicinal and non-medicinal purposes are discussed, and the viability of use in the latter case assessed

On consumer purchasing behavior in electronic markets : (Kumulative Dissertation)

Im Rahmen dieser Dissertation werden hauptsächlich unterschiedliche Aspekte des Kaufverhaltens von Konsumenten auf elektronischen Märkten untersucht. In Herrmann, Kundisch und Rahman (2014) wird der Effekt der Delegierung von Entscheidungen an ein IT-Artefakt auf das Auftreten des Sunk-Cost-Effekts in darauffolgenden Entscheidungen analysiert. In Herrmann (2014) wird der Effekt der Varianz von Kundenbewertungen auf Gleichgewichtspreise und Nachfragen untersucht, Herrmann, Kundisch und Rahman (2013) analysieren den Effekt einer aggressiven Bietstrategie auf die Wahrscheinlichkeit eine Pay-per-Bid Auktion zu gewinnen und Herrmann und Möller (2013) analysieren empirisch und experimentell wie sich die Platzierung von Werbeanzeigen auf unterschiedliche Key-Performance-Indikatoren bei der Suchmaschinenwerbung auswirken. Abgerundet wird die Dissertation durch die Studie Kundisch, Herrmann, Whittaker, Beutner, Fels, Magenheim, Reinhardt, Sievers und Zoyke. (2012) in welcher das PINGO-System zur Übertragung des Peer-Instruction Ansatzes auf große Lerngruppen mit mehr als 350 Teilnehmern vorgestellt und evaluiert wird.This dissertation contains research on different aspects of consumer purchasing behavior in electronic markets. In Herrmann, Kundisch and Rahman (2014), we analyze the effect of delegating decision making to IT on the occurrence of the sunk cost effect in subsequent decisions. Herrmann (2014) presents analytical results on the effect of the variance of online consumer ratings on equilibrium prices and demand. In Herrmann, Kundisch and Rahman (2013), we investigate the relationship between an aggressive bidding strategy and the likelihood of winning a pay-per-bid auction, and in Herrmann and Möller (2013), we empirically and experimentally investigate the impact of ad positioning on key performance indicators in search engine advertising. The dissertation is rounded off with Kundisch, Herrmann, Whittaker, Beutner, Fels, Magenheim, Reinhardt, Sievers und Zoyke. (2012). In this paper, we introduce and evaluate a web-based open source solution that enables the transfer of the widely established Peer Instruction approach to large lectures with in excess of 350 participants.Tag der Verteidigung: 04.07.2014Paderborn, Univ., Diss., 201

Partial Discharge in Electronic Equipments

Tato disertační práce se věnuje studiu částečných výbojů (PD) způsobených poklesem spolehlivosti a životnosti elektronických zařízení a systémů. Diagnostika PD je dnes známá metoda pro vysoké napětí u vysoko-výkonných zařízení. V případě elektronických zařízení PD testování není ale běžně používáná metoda, přestože je zde také potenciál pro vysoké elektrické zatížení vzhledem k velmi krátké vzdálenosti. Tato práce je zaměřena na vyšetřování PD činnosti u elektronických zařízení. Bylo navrženo a provedeno pracoviště pro diagnostiku PD v elektronických zařízeních. Pracovní frekvence se pohybuje od několika stovek Hz až 100 kHz. Maximální amplituda PD testovaného napětí je vyšší než 10 kV. Navzdory jednoduché konstrukci toto zařízení přináší vysokou spolehlivost měření. Více než 300 PD testů bylo provedeno na různých elektronických zařízeních a elektronických součástí,např. na planárních transformátorech a elektronických komponentách používaných při vysoko-napěťových měničíchThis dissertation thesis is devoted to study of partial discharge (PD) caused decrease of reliability and lifetime of electronic equipments and systems. PD diagnostic is nowadays well known method for high voltage high power equipments but in case of electronic devices PD testing it is not used routinely despite that there is also a potential for high electric load due to extremely short distances. The risk of PD caused failure is here extremely high because of high working frequency and consequently high repetition rate of PD events. Therefore, this work is focused on investigation of PD activity in electronic equipments. The workplace for PD diagnostic in electronic devices based on switched power supply was designed and made. Working frequency ranges from several hundreds of Hertz up to 100 kHz. The maximal amplitude of PD testing voltage is higher than 10 kV. Despite the simple design this equipment brings high repeatability and reliability of measurement. More than 300 PD tests were made on different electronic devices and electronic components, on planar transformers, and on components for voltage gate drivers for use in high voltage power converters. Possibilities of PD tools in investigation and engineering ofd insulation systems were demonstrated.

Film: A guide to finding information

A guide to Library resources for Film

PEMANTAUAN ELECTRONIC THESES AND DISSERTATION (ETD) PERPUSTAKAAN UNIVERSITAS SYIAH KUALA MENGGUNAKAN GOOGLE ANALYTICS

Electronic theses and dissertations (ETD) merupakan portal aplikasi elektonik Perpustakaan Universitas Syiah Kuala (Unsyiah) yang menyajikan laporan kuliah kerja praktik, skripsi, tesis dan disertasi hasil penelitian mahasiswa unsyiah, yang dapat diakses oleh kalangan unsyiah maupun diluar Unsyiah. Saat ini Aplikasi ETD sangat banyak dikunjungi sehingga jumlah visitor meningkat. Visitor adalah pengunjung yang sedang membuka/mengakses halaman aplikasi sengaja maupun tidak sengaja. Data pengunjung tersebut sangatlah penting, dengan adanya data tersebut dapat diketahui jumlah pengunjung Aplikasi, semua informasi tersebut dapat diketahui dengan menggunakan google analytics. Google Analytics merupakan layanan gratis yang disediakan oleh raksasa mesin pencari Google, Google analytics menyajikan informasi sehubungan dengan pengunjung dari suatu website, layanan tersebut membantu perpustakaan Unyiah dapat mengetahui informasi dari setiap pengunjung ETD. Untuk melihat data tersebut menggunakan email yang terdaftar sebagai pengguna diakun ETD google analytics, hal tersebut menyebabkan data bersifat tertutup. Dikarenakan sifatnya tertutup, google analytics menyediakan Google Analytics Core Reporting API sehingga developer dapat dikustomisasi report dan menapilkannya di aplikasi pemantauan ETD. Aplikasi pemantauan ETD nantinya menyajikan data pengunjung setiap harinya, browser yang digunakan pengunjung, sistem operasi yang digunakan pengunjung, benua dan negara pengunjung serta menapilkan judul terpopuler

Using e-learning to support international students' dissertation preparation

Purpose: A research paper on the design and implementation of an e-learning resource responding to the globalisation of education. The purpose of this paper is to focus on the challenges presented in learning and teaching on how to support international postgraduate (PG) students undertaking the specific task of a dissertation. Design/methodology/approach: Using findings from 250 PG students, 40 supervisors and two module tutors the research identified the content and language issues faced by students and recognised the need to design an enabler supporting the latter as independent learners and the academic staff delivering support. Findings: The e-learning tool provides an independent learning tool which addresses student concerns relating to the process and content of structuring a dissertation and the function of language. Initial responses have been positive from both staff and students in respect to providing a source of student support and feedback. Originality/value: The research shows how the Dissertation Game Model (DGM), evolved into an e-learning resource supporting student understanding of the content, structure, planning and writing of a dissertation. The e-learning tool focuses on helping international students understand what the generic contents of each chapter of a dissertation should contain and supports them in engaging in research as a transferable skill