Control strategies for brushless doubly fed reluctance machines

Paper presents the development and results of comprehensive comparative analysis of different vector control strategies for performance optimisation of the BDFRM being considered as a viable cost-effective brushless alternative to traditional brush and less reliable solutions in applications with limited variable speed ranges (such as wind turbines). Australian Research Council and EPSRC projects

Theoretical analysis of control properties for the brushless doubly fed reluctance machine

Presents the fundamental theory, modelling aspects and operating/control principles of the BDFRM. This emerging machine technology is being regarded by academic and industrial communities as a prospective brushless candidate for wind turbine generators (especially off-shore installations) and large pump drives where it can offer reliable, maintenance-free, operation and competitive performance at low cost due to the use of a smaller inverter. The results in the paper are the outcomes of a joint research project (Australian Research Council - ARC funded) of the author

Ecology of Mead\u27s Milkweed (\u3ci\u3eAsclepias meadii\u3c/i\u3e Torrey)

Mead\u27s milkweed (Asclepias meadii Torrey) is a plant of virgin prairies, whose pre-settlement range included much of the midwest. It is now a rare plant confined to prairie hay meadows, railroad rights-of-way, prairie preserves and pioneer cemeteries. Studies of approximately a hundred individual plants, producing hundreds of flowering and sterile stems, in the wild and in cultivation for seven years (1965-1971) indicated that it was a moderately-sized plant whose stems averaged 56 cm in height with sagittate sessile leaves with a herringbone arrangement of the veins. In late May to early June a mature stem produced a solitary, terminal, nodding umbel with an average of 12 flowers. Pollination was by digger bees (Anthophora spp.) and bumble bees (Bombus spp.). Approximately 6.4% of the flowering stems produced a long narrow pod averaging 12 cm in length and 1.3 cm in diameter with approximately 60 seeds per pod. Seed germination was relatively low (47.6%). Some plants in virgin prairies and in cultivation were over a quarter century old, and indications are they may live for a century or longer. In contrast to most milkweeds, the seedlings were difficult to grow. Four or more years were usually required to reach maturity. Like most milkweeds, a number of insects were associated with the plant. Most damaging were the larvae of the milkweed beetles (Tetraopes spp.) and milkweed weevils (Rhyssematus spp.) that fed on the roots and the adult weevils that girdled the peduncle causing the eventual collapse of the terminal umbel

Votre Polka

This is a collection of poems from my time in the MFA program. Divided into two sections, the first deals mainly with narrative poems and are newer, the second deals mainly with lyric poems and are more personal

Fill the silence! Basics for modeling hesitation

Betz S, Kosmala L. Fill the silence! Basics for modeling hesitation. In: Rose RL, Eklund R, eds. Proceedings of DiSS 2019. The 9th Workshop on Disfluency in Spontaneous Speech. Budapest: ELTE Faculty of Humanities; 2019: 11-14

Nurses\u27 Alumnae Association Bulletin, May 1960

Accreditation of Programs in Nursing Alumnae Meetings, 1959 Committee Reports Greetings from the President Highlights from first issue of Alumnae Bulletin Living in the new nurses residence Lost Members Marriages Necrology New Arrivals Notices Personal Items of Interest Report of the School of Nursing and Nursing Services Staff Nurses Association Student Activities Year of tremendous growth and expansio

Prolongation in German

Betz S, Eklund R, Wagner P. Prolongation in German. In: Eklund R, Rose R, eds. Proceedings of DiSS 2017, Disfluency in Spontaneous Speech. TMH-QPSR. Vol 58. Stockholm: Royal Institute of Technology, Sweden; 2017: 13-16

Silylation of C–H bonds in aromatic heterocycles by an Earth-abundant metal catalyst

Heteroaromatic compounds containing carbon–silicon (C–Si) bonds are of great interest in the fields of organic electronics and photonics1, drug discovery, nuclear medicine and complex molecule synthesis, because these compounds have very useful physicochemical properties. Many of the methods now used to construct heteroaromatic C–Si bonds involve stoichiometric reactions between heteroaryl organometallic species and silicon electrophiles or direct, transition-metal-catalysed intermolecular carbon–hydrogen (C–H) silylation using rhodium or iridium complexes in the presence of excess hydrogen acceptors. Both approaches are useful, but their limitations include functional group incompatibility, narrow scope of application, high cost and low availability of the catalysts, and unproven scalability. For this reason, a new and general catalytic approach to heteroaromatic C–Si bond construction that avoids such limitations is highly desirable. Here we report an example of cross-dehydrogenative heteroaromatic C–H functionalization catalysed by an Earth-abundant alkali metal species. We found that readily available and inexpensive potassium tert-butoxide catalyses the direct silylation of aromatic heterocycles with hydrosilanes, furnishing heteroarylsilanes in a single step. The silylation proceeds under mild conditions, in the absence of hydrogen acceptors, ligands or additives, and is scalable to greater than 100 grams under optionally solvent-free conditions. Substrate classes that are difficult to activate with precious metal catalysts are silylated in good yield and with excellent regioselectivity. The derived heteroarylsilane products readily engage in versatile transformations enabling new synthetic strategies for heteroaromatic elaboration, and are useful in their own right in pharmaceutical and materials science applications