The theory of an active magnetic regenerative refrigerator

The adiabatic temperature change with field which is limited to about 2 K/Tesla for ferromagnets near their Curie temperatures by the change of magnetization with temperature and the lattice heat capacity is discussed. Practical magnetic refrigerators operate on a regenerative cycle such as the Brayton cycle. This cycle can be executed through the use of an active magnetic regenerator, i.e., a regenerator composed of magnetic material that is cycled in an out of a magnetic field with appropriate fluid flows. The theory of these devices is predicted by solving the partial differential equations that describe fluid and the magnetic solid. The active magnetic regenerator is described along with the method of calculation. Temperature profiles for a normal regenerator and a magnetic regenerative refrigerator are shown

A thermodynamical model for rainfall-triggered volcanic dome collapse

Dome-forming volcanic eruptions typically involve the slow extrusion of viscous lava onto a steep-sided volcano punctuated by collapse and the generation of hazardous pyroclastic flows. We show an unequivocal link between the onset of intense rainfall and lava dome collapse on short time scales (within a few hours) and develop a simple thermodynamical model to explain this behavior. The model is forced with rainfall observations from the Soufriere Hills Volcano, Montserrat, and suggests that when the dome is in a critical state, a minimum rainfall rate of approximately 15 mm hr-1 for 2-3 hr could trigger a dome collapse

Household Networks and Early Christian Economics: A Fresh Study of 1 Timothy 5.3–16

1 Tim 5.3-16 defines which women may be registered for financial support at church expense. It is integrated around four ‘household rules’, but is not concerned to regulate an ‘order’ or ‘office’ of widows. Rather, it clarifies that the church should not supplant households in financial matters, and should be responsible only for destitute widows who have no other network support. Since χήρα can mean ‘woman without a man’, the instructions in 5.11-15 are best interpreted as directed against young women who have chosen celibacy. By contrast, the author conceives of the church as a network of Christian households connected by mutual economic support

On the debt Capacityof growth Options

If debt capacity is defined as the incremental debt that is optimally associated with an additional asset, then the debt capacity of growth options is negative. Underinvestment costs of debt increase and free cash flow benefits of debt fall with additional growth options. Thus, if firm value increases with additional growth options, then leverage not only declines, but the firm’s optimal total debt level declines as well. This result implies a negative relation between book leverage and growth options and provides a new economic interpretation of book leverage regressions.Growth options; Book leverage

Postcolonial France?: the problematisation of Frenchness through North African immigration: a literary study of metropolitan novels 1980-2000

This thesis undertakes a literary study of contemporary novels published by metropolitan French writers between 1980 and 2000, and analyses their representation of the changing relationship between France and North Africa. It begins by analysing the specificity of the situation in France, arguing that this is largely due to the functioning of the French Republican tradition, which equates inassimilable difference with inferiority. Consequently, France’s former colonies represent a privileged site of the Republican relationship with difference. This is particularly acute in the case of Algeria, by virtue of its former status as an integral part of the French Republic, and as a result of the large population of Algerian origin resident within France. It therefore offers a useful perspective from which to assess the extent to which French identities and systems of representation have been problematised in the post-colonial era. Part One examines contemporary French attitudes towards the wider Maghreb, including examples from Morocco, Algeria and Tunisia. Drawing on traditions which extend back to Montaigne and Montesquieu, it considers contemporary updating of Orientalist traditions within which French writers have explored other countries as seen from the Hexagon. Part Two concerns the singularity of Algeria’s relationship with France. By focusing on a case-study – representations of the Paris massacre of 17 October 1961 – the thesis draws wider conclusions about the way in which attitudes to the Algerian War are changing, and the key role potentially played by literary and other artistic representation. The final chapter looks at recollections of life in Algeria in the work of two women writers, Marie Cardinal and Hélène Cixous. It concludes that their early experience there of conflict and otherness was fundamental in shaping the development of their writing project, and that their literary memories destabilise notions of a unified ‘Frenchness’

The birth order paradox: sibling differences in educational attainment

This study uses population register data to examine the relationship between birth order and educational attainment in Sweden, and demonstrates that while the net effect of birth order on educational attainment is negative, later-born children often spend longer in education. The explanation for this finding is due to educational expansion in Sweden in the 20th century, which outweighs the negative causal effect of birth order for the affected cohorts. This is particularly true for women due to the fact that the rate of increasing educational enrolment has been greater for women than for men. These results also show that later-borns in large families particularly benefit from educational expansion due to the longer average birth interval between the first and last child in large families, meaning that the supply of educational opportunities increased to a greater extent in the intervening period. However, in periods where education is not expanding, later-born siblings continue to fare worse than first-borns