17,355 research outputs found
Local magnetic shear control in a Tokamak via fast wave minority ion current drive: theory and experiments in JET
No full textLine-start permanent-magnet motor: single-phase starting performance analysis
No full textThis paper presents a detailed quasi-steady-state approach to different torque components (average and pulsating) for a single-phase capacitor-run permanent-magnet (PM) motor. By employing average electromagnetic torque, and the expected envelope of the pulsating torque, an accurate prediction of starting torque components behavior is made. The quasi-steady-state analysis of the asynchronous performance of the single-phase capacitor-start capacitor-run PM motor is realized through a combination of symmetrical components and d-q axes theory. The developed approach is valid for any m-phase AC motor-induction, synchronous reluctance, or synchronous PM
Asynchronous performance analysis of a single-phase capacitor-start, capacitor-run permanent magnet motor
No full textThis work presents a detailed analysis of the asynchronous torque components (average cage, magnet braking torque and pulsating) for a single-phase capacitor-start, capacitor-run permanent magnet motor. The computed envelope of pulsating torque superimposed over the average electromagnetic torque leads to an accurate prediction of starting torque. The developed approach is realized by means of a combination of symmetrical components and d-q axes theory and it can be extended for any m-phase AC motor - induction, synchronous reluctance or synchronous permanent magnet. The resultant average electromagnetic torque is determined by superimposing the asynchronous torques and magnet braking torque effects
The effect of hydra mutations on HD-START domain genes in Arabidopsis thaliana
No full textThe study of sterol defective mutants of Arabidopsis thaliana has provided an invaluable opportunity to investigate the importance of sterols in plant development. The hydra mutants in particular - seedling lethal mutations - exhibit great phenotypic variation, leading to the supposition that sterols have a far more complex role in plant development than previously anticipated. It has been postulated that some sterol molecules are directly involved in the regulation of gene transcription during plant development. The binding of some sterols to START domains (sterol binding domains) found in some mammalian proteins has been noted, and it is possible that plant transcription factors containing START domains could be localised to the nucleus by the binding o f specific sterols. This hypothesis may be tested by creating HD-START::GFP fusion proteins to act as a reporter, permitting the subcellular localisation o f the produced protein to be viewed using confocal scanning laser microscopy. In order to determine if the expression of START domain transcription factors is itselfregulated by sterols, independent of possible roles for sterols in their localization to the nucleus, the comparative steady state transcription levels of five HD-START domain transcription factors were studied by real-time RT-PCR. A comparison of hydra mutant mRNA levels to their wild type counterparts was carried out to determine whether there is a requirement for sterols in the regulation o f the tested genes. Although the results do appear to suggest this to be the case, the data and the conclusions require further validation
Different profiles of the aerial start phase in front crawl
No full textThis study analyzed the kinematics and kinetics (jumping ability) of the aerial start phase in 11 elite front crawl sprinters. The aim was to determine whether a particular start technique leads to a short 15 m start time or whether several start profiles contribute equally well. All swimmers performed 3 starts using their preferential style, which was the grab start for all, followed by a 25-m swim at maximal velocity. Countermovement jump enabled to determine vertical jumping ability. Using a video device, phase durations, angles at takeoff and entry, and hip velocity were assessed. Correlation between all variables and the 15 m start time established the common features of an effective start but also revealed great intersubject variability. Cluster analysis enabled to distinguish 4 start profiles (flat, pike, flight, and Volkov), indicating that several individual profiles lead to short 15 m start times. It could be advised to consider the intersubject variability in relation to start time before favoring unique strategy. © 2010 National Strength and Conditioning Association
RV Ronald H. Brown Cruise RB0602 and RRS Discovery Cruise D304, Rapid Mooring Cruise Report March and May 2006
No full textThis report describes the mooring operations conducted during RV Ronald H. Brown Cruise RB0602 and RRS Discovery Cruise D304. Cruise RB0602 was conducted between 9 March 2006 and 28 March 2006, and Cruise D304 was conducted between 12 May 2006 and 6 June 2006.These mooring operations were completed as part of the United Kingdom Natural Environment Research Council (NERC) funded RAPID Programme to monitor the Atlantic Meridional Overturning Circulation at 26.5ºN. The primary purpose of these cruises was to service the 26.5ºN mooring array first deployed in 2004 during RRS Discovery cruises D277 and D278 (SOC cruise report number 53), and serviced in 2005 during RRS Charles Darwin Cruise CD170 and RV Knorr Cruise KN182-2 (NOCS cruise report number 2), and RRS Charles Darwin Cruise CD177 (NOCS cruise report number 5).Cruise RB0602 was from Barbados to Charleston, SC, and covered the Western Boundary moorings deployed on KN182-2. Cruise D304 was to and from Tenerife and covered the Eastern Boundary and Mid-Atlantic Ridge moorings deployed on cruises CD170 and CD177. These cruises are the second annual refurbishment of an array of moorings deployed across the Atlantic in order to set up a pre-operational prototype system to continuously observe the Atlantic Meridional Overturning Circulation (MOC). Cruise CD177 was an intermediate service cruise to obtain data from the two principal Eastern Boundary moorings six months after deployment. This array will be further refined and refurbished during subsequent years. The instruments deployed on the array consists of a variety of current meters, bottom pressure recorders, CTD loggers and Inverted Echosounders, which, combined with time series measurements of the Florida Channel Current and wind stress estimates, will be used to determine the strength and structure of the MOC at 26.5ºN. (http://www.noc.soton.ac.uk/rapidmoc)<br/
Irreducible subfactors derived from Popa's construction for non-tracial state
No full textFor an inclusion of the form C⊆Mn(C)
, where M n (C) is endowed with a state with diagonal weights λ = (λ1, ..., λn), we use Popa’s construction, for non-tracial states, to obtain an irreducible inclusion of II1 factors, Nλ(Q)⊆Mλ(Q)
of index ∑1λi
. Mλ(Q) is identified with a subfactor inside the centralizer algebra of the canonical free product state on Q ⋆ M N (C). Its structure is described by “infinite” semicircular elements as in {xc[32]}.
The irreducible subfactor inclusions obtained by this method are similar to the first irreducible subfactor inclusions, of index in [{xc4},∞) constructed in {xc[24]}, starting with the Jones’ subfactors inclusion Rs⊆R
, s gt; 4. In the present paper, since the inclusion we start with has a simpler structure, it is easier to control the algebra structure of the subfactor inclusions.
If the weights correspond to a unitary, finite-dimensional representation of a Woronowicz’s compact quantum group G, then the factor Mλ(Q) is contained in the fixed point algebra of an action of the quantum group on Q ⋆ MN(C), with equality if G is SUq(N), (or SOq(3) when N = 2). By Takesaki duality, the factor Mλ(L(FN)) is Morita equivalent to
L
(F∞).
This method gives also another approach to find, as also recently proved in {xc[36]}, irreducible subfactors of
L
(F∞) for index values bigger than 4
Picking the Winner? - Empirical Evidence on the Targeting of R&D Subsidies to Start-ups
No full textThis paper investigates the allocation of R&D subsidies given to start-ups. Considering the coexistence of various R&D project schemes, we take an aggregate view and analyze the determinants of the receipt of (any) R&D subsidies within the first three business years of the start-ups. We argue that policymakers and funding authorities follow a strategy of "picking the winner". Analyzing a unique data set of start-ups in the East German state of Thuringia, we conduct logistic regressions and find ambiguous support. R&D subsidies are given to start-ups with innovative business ideas, especially academic spin-offs. On the other hand, the ambitions and the patent stock of the founder(s) do not decide the receipt of R&D subsidies. These insights into the overall allocation of R&D subsidies are important since they have implications for policy effectiveness and efficiency. The implied difficulties of policy targeting fundamentally question the massive subsidization of private R&D.Start-ups, R&D subsidies, Subsidy allocation
Evaluation of Sure Start Bramley 2001-2007
No full textSure Start Bramley (2000 – 2007) was situated in a mixed urban area in West Leeds. Its
population in 2000 was 22,428. The population of Children under four in the Sure Start area
in 2001 was 1,039 (Source: Leeds Community Health Trust, 2001 quoted in the revised Sure
Start Delivery Plan, 2001). At that time there were 907 families with children under four in
the area. Approximately 97.8% of the population was white British. The area covered by
Sure Start Bramley expanded to include Armley and other areas of West Leeds from 2004 -
2005
- …
