Mathematics and Physics
http://hdl.handle.net/2160/283
2016-09-30T10:07:27ZAn MCP based detector array with integrated electronics
http://hdl.handle.net/2160/30724
An MCP based detector array with integrated electronics
Langstaff, David
Various position sensitive readout systems for microchannel plates are considered. A discrete anode detector with 192 channels and integrated data acquisition electronics developed at the University of Wales, Aberystwyth is presented. Details of the custom silicon circuit which performs data acquisition in the device are given, together with key performance indicators. An example application of the detector enhancing the performance of a GCMS measurement is given. The next generation of detector currently under development is briefly introduced.
Langstaff, David, (2002) 'An MCP-based detector array with integrated electronics', International Journal Of Mass Spectrometry 215(1-3) pp.1-12 RAE2008
2002-04-01T00:00:00ZTidal Influences at the Lunar Crater Aristarchus and Transient Lunar Phenomena
http://hdl.handle.net/2160/10480
Tidal Influences at the Lunar Crater Aristarchus and Transient Lunar Phenomena
Cook, A. C.
This abstract investigates whether there is an obvious correlation between transient lunar phenomena and Earth tides on the Moon, as has been claimed in past publications. Aristarchus Crater observations are used in this study.
Contribution No. 1608
2011-03-07T00:00:00ZCharacteristic Functions of Liftings
http://hdl.handle.net/2160/7640
Characteristic Functions of Liftings
Dey, Santanu; Gohm, Rolf
We introduce characteristic functions for certain contractive liftings of row contractions. These are multi-analytic operators which classify the liftings up to unitary equivalence and provide a kind of functional model. The most important cases are subisometric and coisometric liftings. We also identify the most general setting which we call reduced liftings. We derive properties of these new characteristic functions and discuss the relation to Popescu's definition for completely non-coisometric row contractions. Finally we apply our theory to completely positive maps and prove a one-to-one correspondence between the fixed point sets of completely positive maps related to each other by a subisometric lifting.
2011-10-31T00:00:00ZNon-commutative Markov chains and multi-analytic operators
http://hdl.handle.net/2160/3976
Non-commutative Markov chains and multi-analytic operators
Gohm, Rolf
We study a model of repeated interaction between quantum systems which can be thought of as a non-commutative Markov chain. It is shown that there exists an outgoing Cuntz scattering system associated to this model which induces an inputâ€“output formalism with a transfer function corresponding to a multi-analytic operator, in the sense of multivariate operator theory. Finally we show that observability for this system is closely related to the scattering theory of non-commutative Markov chains.
Journal of Mathematical Analysis and Applications, Volume 364, Issue 1, 1 April 2010, Pages 275-288
2010-04-01T00:00:00Z