Comparison of a PWM Inverter and a Multilevel Inverter using the Switching Function Analysis for Harmonic Content and Efficiency

A conventional 3-level PWM Inverter and a Cascaded Multilevel Inverter, both rated at 230Vrms voltage output and 3KW are analysed using the Switching Function. The PWM signal for the 3-level inverter is derived by applying the Switching Function Technique to the equal area principle. For the Cascaded Multilevel Inverter the Switching Function Technique is initially applied to each H-bridge, and then added to derive the overall Switching Function for the Multilevel Inverter output. A new technique is employed to derive the pulse width of each H-bridge converter in order to construct the output voltage. Voltage expressions of the output voltages are derived for both topologies. The switching frequency is chosen to be the same for both inverters. To ensure the same number of commutations over a fundamental cycle for both inverters, the levels of the Multilevel Inverter must be properly selected to meet the PWM frequency of the conventional inverter. Frequency spectrum and expressions of THD of the output voltage are derived. The two inverters are compared in terms of THD and harmonic content of the output voltage. The efficiency is concluded from the number of switching instances and other parameters of the circuit

Two new fishes of the myctophid genus Diaphus from the Atlantic Ocean

Volume: 133Start Page: 401End Page: 42

The semantics of space in the literature of Russian modernism: Revisiting the <italic>Topoi</italic> of Petrograd's House of Arts (1919--1923).

The Petrograd House of Arts existed during a period of dramatic transition in Russia. During the later years of War Communism and the beginning of the New Economic Policy, the House of Arts (or DISK) was one of the city's most significant sources of cultural programming and social assistance for the creative intelligentsia, particularly writers. Given the celebrity of many of its members and that almost all them were writers, it was perhaps inevitable that the House would figure in their work. More remarkably, this included not only memoirs, but also stories, poems, and other artistic texts, most of which invested the House's interior spaces with metaphorical resonance. The texts coalesce into a response to the House's embattled political situation and, more importantly, into a mythos about the House of Arts, a collaborative impulse to reproduce the social and artistic space of an institution whose meaning reverberated beyond the few years of its existence. The primary purpose of this dissertation is to set forth the defining characteristics of the DISK mythos in its reproduction of the House of Arts as social, artistic and architectural space. This includes an examination of the ways in which the mythos functions as an artistic text and an artistic space. To more distinctly delineate the space of the mythos, the dissertation is divided into three parts. The first part reconstructs the administrative-bureaucratic narrative surrounding the House and posits the DISK mythos as a counterplot to this more public story of the institution. The second part addresses the nexus of spatial interpretations of memory, power and text that underlies the mythos' creation. The third part discusses four types of rooms within the House that emerged as critical spaces for the mythos authors' construction of their identities as writers during an era when these identities were contested. The rooms can be interpreted as representations of choices confronting the era's creative intelligentsia: to participate in a dialogue about the future, to turn to the past for material, to write about present realities, or to cultivate an aesthetics independent of time and place.Ph.D.Language, Literature and LinguisticsSlavic literatureUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/123920/2/3106134.pd

The Role of the 21st-Century Library: Inspiring Undergraduate Researchers through Cross-Campus Partnerships

Librarians at the University of Miami and University of California Los Angeles will describe how collaborations with campus partners, including Writing Centers, Honors Programs, and Undergraduate Research Centers, are resulting in new opportunities to address institutional challenges in supporting undergraduate researchers. Examples will include the creation of a peer research consultation service and a library undergraduate research fellowship program. The presentation will demonstrate how engagement with campus partners is proving key to the transformation of library spaces and services to inspire and empower 21st-century learners. The interactive session will involve participants in discussion of opportunities for such collaborations at their institutions

Resources of interest at the Stanford University Libraries: Unique collections, difficulties in collecting and providing access

W artykule omówiono unikalne (przynajmniej w Stanach Zjednoczonych) polonika (książki, efemera, archiwalia) w kolekcji Biblioteki Uniwersytetu Stanforda w Kalifornii oraz trudności związane z rozwojem, opracowaniem i konserwacją materiałów polskich w amerykańskiej bibliotece akademickiej, w tym m.in. preferowanie uzupełniania zbiorów w języku rosyjskim, brak zalinkowanych rekordów podobnych kolekcji lub stan fizyczny poloników wymagających zabiegów konserwatorskich. W pierwszej części przedstawiono kolekcje związane z polską emigracją, m.in. efemera wydane w Paryżu w latach 1830-1840, oraz z literaturą emigracyjną i rynkiem wydawniczym w USA, Europie i Polsce po II wojnie światowej: Archiwum Zygmunta Haupta, Kolekcję listów Zdzisława Ruszkowskiego oraz Archiwum Wydawnictwa Rój. W drugiej części artykułu omówiono nowsze kolekcje jako obiekty mogące potencjalnie zainteresować badaczy kultury i historii polskiej, takie jak: seria fotografii Allena Ginsburga (1926-1997), ikony poezji amerykańskiej, przedstawiciela tzw. Beat Generation, z jego pobytu w Polsce (1986, 1993) oraz maszynopis tekstu Agnieszki Holland o stanie polskiego kina z 1984 r. z jej odręcznymi poprawkami.This paper discusses unique (at least in the United States) Polish resources in the collections of the Stanford University Libraries, including books, ephemeral publications, documents and the difficulties involved with the collection development, processing and conservation of Polish materials in American academic libraries. The first part of the presentation addresses collections related to émigré subject, in particular ephmera published by the Polish émigré community in Paris in the years 1830-1840 and related to the post-war émigré literature and the publishing market in the United States, Europe and Poland: the Zygmunt Haupt Archive, the Zdzisław Ruszkowski Correspondence collection, and the Roy Publishers Archive. In the second part of the presentation other examples of items of potential interest to researchers of Polish history and culture are discussed, including: a series of photographs by Allen Ginsburg (1926-1997), an icon of American poetry and a foremost representative of the so-called Beat Generation, from his travels in Poland (1986, 1993) and the typescript of a text by film director Agnieszka Holland about the state of Polish cinema in 1984, with corrections in her own writing