A grounded theory analysis of the occupational impact of caring for a partner who has multiple sclerosis

Chronic progressive conditions such as multiple sclerosis impact engagement in and orchestration of daily occupations by people with the condition, and their family members. This qualitative study addressed the way in which multiple sclerosis can affect family life, particularly exploring how it affects the occupations of the partner of a person with the condition. The study involved in-depth interviewing and grounded theory analysis to explore the occupational nature of being a partner of someone who has multiple sclerosis. Findings reveal how partners’ occupations are affected over time, with occupational opportunities inspired by multiple sclerosis and occupational constraints provoked by the disorder, including nostalgia for an multiple sclerosis free existence, the transition to being a carer and an occupationally uncertain future

Asteroseismic study of solar-like stars: A method of estimating stellar age

Asteroseismology, as a tool to use the indirect information contained in stellar oscillations to probe the stellar interiors, is an active field of research presently. Stellar age, as a fundamental property of star apart from its mass, is most difficult to estimate. In addition, the estimating of stellar age can provide the chance to study the time evolution of astronomical phenomena. In our poster, we summarize our previous work and further present a method to determine age of low-mass main-sequence star.Comment: 2 pages, 1 figures, submitted to IAUS25

The magnetic field generated by an electron bound in angular-momentum eigenstates

The magnetic field generated by an electron bound in a spherically symmetric potential is calculated for eigenstates of the orbital and total angular momentum. General expressions are presented for the current density in such states and the magnetic field is calculated through the vector potential, which is obtained from the current density by direct integration. The method is applied to the hydrogen atom, for which we reproduce and extend known results.Comment: This article is a long version of our article which will appear in Eur. J.phys.20. It contains 22 pages 3 figure

Quantum Stochastic Processes and the Modelling of Quantum Noise

This brief article gives an overview of quantum mechanics as a {\em quantum probability theory}. It begins with a review of the basic operator-algebraic elements that connect probability theory with quantum probability theory. Then quantum stochastic processes is formulated as a generalization of stochastic processes within the framework of quantum probability theory. Quantum Markov models from quantum optics are used to explicitly illustrate the underlying abstract concepts and their connections to the quantum regression theorem from quantum optics.Comment: 14 pages, invited article for the second edition of Springer's Encyclopedia of Systems and Control (to appear). Comments welcom

The Effect of Block Ownership on Future Firm Value and Performance

This paper examines the performance of the investment decisions of block owners. The block ownership data is obtained from Dlugosz, Fahlenbrach, Gompers, and Metrick (2006). We find that firm valuation (measured by Tobin's Q), operating performance (measured by changes in return on assets) and stock performance (measured by excess buy and hold returns) are positively and significantly related to the previous years' level of block ownership both in terms of the size of the ownership and the number of blockholders. Our results are robust to endogeneity concerns. Regarding whether a specific blockholder is an “insider” or an “outsider” to the firm, we find that the ownership of “outside” blockholders is a key determinant in explaining future firm performance. Note though that this category makes up about two-thirds of the aggregate amount of blockholding in Dlugosz et al. (2006) database, and also includes all blockholders not classified in other categories. In general, we attribute the superior performance to the presence of more blockholders. We also find an inverse association between the volatility in blockownership and the ex-post firm performance measures