Error analysis for station position from tracking of the Lageos satellite

The earth physics satellite systems error analysis program was applied to the problem of predicting the relative accuracy of station position determinations under varying orbital and observing geometries. The reference case consists of nine ground stations extending over 1500 km which lasers ranged to a LAGEOS satellite, with simultaneous Doppler tracking from a geosynchronous satellite for 16 days. Eleven variations from the reference case were tested. The results showed little sensitivity to whether the LAGEOS altitude is 3700 or 5690 km. More significant were the high inclination, and that LAGEOS was tracked by a geosynchronous satellite

Pancyclic Cayley Graphs

2010 Mathematics Subject Classification: Primary 05C25. Secondary 20K01, 05C45.Let Cay(G;S) denote the Cayley graph on a finite group G with connection set S. We extend two results about the existence of cycles in Cay(G;S) from cyclic groups to arbitrary finite Abelian groups when S is a “natural” set of generators for G.This research was supported in part by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada

Nonequilibrium Superconductor-Normal Metal Tunnel Contact and the Phonon Deficit Effect

We consider tunnel microrefrigerators at low temperature. There is a number of experimental studies performed on microrefrigeration in tunneling superconductor--normal metal (SN) structures. Related to these experiments, only the electron subsystem has been considered theoretically. Independently, the phonon deficit effect has been studied a while ago in superconductor-superconductor tunnel junctions. It can be regarded as a possible prototype scheme for superconducting microrefrigerators. We try to provide the missing link between experiments on the SN tunnel junction refrigerators and the theory which includes microscopically phonons in combination with the mechanism of the phonon deficit effect.Comment: 2 pages, 1 figur

WHAT IS 'A SUCCESSFUL UNIVERSITY'?

"The aim of this paper is to provide a basis for discussion and debate on definitions, characteristics and criteria of measurement of a successful university. While the core mission of universities indisputably remains teaching and research (Shattock 2010), universities in the 21s t century are increasingly called on to assume expanded roles as key players in knowledge societies and the knowledge economy. As universities take on these diverse roles, it becomes more difficult to agree on definitions and characteristics of success, and on valid and reliable criteria for measuring how successful they are. While this issue of defining success and its characteristics is implicit in many studies of various aspects of higher education, there is surprisingly little literature directly addressing the issue in a comprehensive and systematic way. As Shattock (2010: 7) has observed, "we feel instinctively we can recognise successful universities when we see them", but it can be challenging to provide justification and evidence for these judgements. This is especially true as universities seek to locate themselves within global systems, where global measures of certain aspects of success overshadow any other definitions or characteristics of success." -

WHAT IS 'A SUCCESSFUL UNIVERSITY'?

"The aim of this paper is to provide a basis for discussion and debate on definitions, characteristics and criteria of measurement of a successful university. While the core mission of universities indisputably remains teaching and research (Shattock 2010), universities in the 21s t century are increasingly called on to assume expanded roles as key players in knowledge societies and the knowledge economy. As universities take on these diverse roles, it becomes more difficult to agree on definitions and characteristics of success, and on valid and reliable criteria for measuring how successful they are. While this issue of defining success and its characteristics is implicit in many studies of various aspects of higher education, there is surprisingly little literature directly addressing the issue in a comprehensive and systematic way. As Shattock (2010: 7) has observed, "we feel instinctively we can recognise successful universities when we see them", but it can be challenging to provide justification and evidence for these judgements. This is especially true as universities seek to locate themselves within global systems, where global measures of certain aspects of success overshadow any other definitions or characteristics of success." -

Electronic spectra of polyatomic molecules with resolved individual rotational transitions

The density of rotational transitions for a polyatomic molecule is so large that in general many such transitions are hidden under the Doppler profile, this being a fundamental limit of conventional high resolution electronic spectroscopy. We present here the first Doppler-free cw two-photon spectrum of a polyatomic molecule. In the case of benzene, 400 lines are observed of which 300 are due to single rotational transitions, their spacing being weil below the Doppler profile. The resolution so achieved is 1.5 X 10'. Benzene is a prototype planar molecule taken to have D •• symmetry in the ground as weil as in the first excited state. From our ultra-high resolution results it is found that benzene in the excited SI state i8 a symmetrical rotor to a high degree. A negative inertial defect is found for the excited state. The origin of this inertial defect is discused

Hypercentral units in alternative loop rings

AbstractLet L be an RA loop, that is, a loop whose loop rings are alternative, but not associative, rings (in any characteristic). We find necessary and sufficient conditions under which the hypercentral units in the integral loop ring ZL are central