The Mid-IR Spectral Effects of Darkening Agents and Porosity on the Silicate Surface Features of Airless Bodies

We systematically measured the mid-IR spectra of different mixtures of three silicates (antigorite, lizardite, and pure silica) with varying effective porosities and amounts of darkening agent (iron oxide and carbon). These spectra have broad implications for interpretation of current and future mission data for airless bodies, as well as for testing the capabilities of new instruments. Serpentines, such as antigorite and lizardite, are common to airless surfaces, and their mid-IR spectra in the presence of darkening agents and different surface porosities would be typical for those measured by spacecraft. Silica has only been measured in the plumes of Enceladus and presents exciting possibilities for other Saturn-system surfaces due to long range transport of E-ring material. Results show that the addition of the IR-transparent salt, KBr, to simulate surface porosity affected silicate spectra in ways that were not predictable from linear mixing models. The strengthening of silicate bands with increasing pore space, even when only trace amounts of KBr were added, indicates that spectral features of porous surfaces are more detectable in the mid-IR. Combining iron oxide with the pure silicates seemed to flatten most of the silicate features, but strengthened the reststrahlen band of the silica. Incorporating carbon with the silicates weakened all silicate features, but the silica bands were more resistant to being diminished, indicating silica may be more detectable in the mid-IR than the serpentines. We show how incorporating darkening agents and porosity provides a more complete explanation of the mid-IR spectral features previously reported on worlds such as Iapetus

Fatalities due to intestinal obstruction following the ingestion of foreign bodies

Two fatalities due to an occlusive ileus following the ingestion of foreign bodies in patients with psychiatric disorders are described. A severely mentally handicapped young man developed a temperature and died 1 h after admission to a surgical ward. At autopsy, not, vert, similar 2000 cm3 of foreign material, including broken glass and porcelain, branches, buttons, parts of clothing and other material were found in the gastrointestinal tract, leading to a complete obstruction of the distal intestine and colon with resulting faecal vomiting. The other case was even more unusual as a hair fetishist had swallowed a thick strand of his own hair, 50 cm long, also resulting in mechanical obstruction of the distal intestine

The Meltdown of the Global Economy: A Keynes-Minsky Episode?

The enormity and pervasiveness of the global economic crisis that began in 2008 makes it relevant to analyze the circumstances that can explain this catastrophe. This will also provide clues to the appropriate remedial measures needed to prevent future occurrences of similar developments. The paper begins with some theoretical concerns relating to factors that could trigger a similar crisis. The first of these concerns relates to the deregulated financial institutions and the growing uncertainty that can be witnessed in these liberalized financial markets. The secondrelates to financial engineering with innovations in these markets, simultaneously providing cushions against risks while generating flows of liquidity that remain beyond the conventional sources of bank credit. Interpreting the role of uncertainty, one can observe the connections between investment and finance, both of which are subject to changes in the state of expectations. The initial formulation can be traced back to John Maynard Keynes's General Theory (1936), where liquidity preference is linked to asset prices and new investments. The Keynesian analysis of the impact of uncertainty related expectations was reformulated in 1986 by Hyman P. Minsky, who introduced the possibility of sourcing external finance through debt, which further adds to the impact of uncertainty. Minsky's characterization of deregulated financial markets considers the newfangled sources of nonbank credit, especially with the involvement of banks in the securities market under the universal banking model. As for the institutional arrangements that provide for profits on transactions, financial assets bought and sold in the primary market as initial public offerings of stocks are usually transacted later, in the secondary market, where these are no longer backed by physical assets.In the upswing, finance creates a myriad of financial claims and liabilities, and thus becomes increasingly remote from the real economy, while innovations to hedge and insulate assets continue to proliferate in the financial market, especially in the presence of uncertainty. The paper dwells on an account of the pattern of the financial crisis and its spread in the United States. This is appended by a stylized account of the turn of events in terms of a theoretical model that highlights the role of uncertainty in the process

The Social and Economic Importance of Full Employment

Unemployment was singled out by John Maynard Keynes as one of the principle faults of capitalism; the other is excessive inequality. Obviously, there is some link between these two faults: because: since most people living in capitalist economies must work for wages as a major source of their incomes, inability to obtain a job means lower income. If jobs can be provided to the unemployed, inequality and poverty will be reduced although such policy will not directly address the problem of excessive income at the top of the distribution. Most importantly, Keynes wanted to put unemployed labor to work not digging holes, but in socially productive ways. This would help to ensure that the additional effective demand created by government spending would not be exhausted in higher prices as it ran up against bottlenecks or other supply constraints. Further, it would help maintain public support for the government's programs by providing useful output. And it would generate respect for, and feelings of self-worth in, the workers employed in these projects (no worker would want to spend her days digging holes that serve no useful purpose). President Roosevelt's New Deal jobs programs (such as the Works Progress Administration and the Civilian Conservation Corps) are good examples of such targeted job-creating programs. These provided income and employment for workers, actually helped increase the nation's productivity, and left us with public buildings, dams, trails, and even music that we still enjoy today. As our nation (and the world) collapses into deep recession, or even depression, it is worthwhile to examine Hyman P. Minsky's comprehensive approach to resolving the unemployment problem

Quasiparticle coherence and the nature of the metal-insulator phase transition in Nax_xCoO2_2

Layered cobaltates embody novel realizations of correlated quantum matter on a spin-1/2 triangular lattice. We report a high-resolution systematic photoemission study of the insulating cobaltates (Na1/2CoO2 and K1/2CoO2). Observation of single-particle gap opening and band-folding provides direct evidence of anisotropic particle-hole instability on the Fermi surface due to its unique topology. Kinematic overlap of the measured Fermi surface is observed with the $\sqrt{3}$x$\sqrt{3}$ cobalt charge-order Brillouin zone near x=1/3 but not at x=1/2 where insulating transition is actually observed. Unlike conventional density-waves, charge-stripes or band insulators, the on-set of the gap depends on the quasiparticle's quantum coherence which is found to occur well below the disorder-order symmetry breaking temperature of the crystal (the first known example of its kind).Comment: 4+ pages, 5 figure

Communication Empowerment Framework: an Integrative Framework to Support Effective Communication and Interaction Between Carers and People Living with Dementia

ObjectivesTo demonstrate the power of integrating three theoretical perspectives (Mentalization Theory, Perceptual Control Theory and the Communicative Impact model), which jointly illuminate the communication challenges and opportunities faced by family carers of people with dementia. To point the way to how this framework informs the design and delivery of carer communication and interaction training.MethodConceptual synthesis based on a narrative review of relevant literature, supported by examples of family carers.ResultsWe use the conceptual models to show how the capacity to mentalize (“holding mind in mind”) offers a greater sense of control over internal and external conflicts, with the result that they can be deescalated in pursuit of mutual goals.ConclusionsThe integrative conceptual framework presented here highlights specific psychological and relational mechanisms that can be targeted through carer training to enhance communication with a person living with dementia

The Wicked Machinery of Government: Malta and the Problems of Continuity under the New Model Administration

This is a study focused on the early years of British rule in Malta (1800-1813). It explores the application to the island of the “new model” of colonial government, one based on direct rule from London mediated by the continuation of existing laws and institutions. Systemic deficiencies are identified. These tended to undermine the effectiveness of direct British rule. This study also reveals, in the context of legal and constitutional continuity, unresolved tensions between modernity and tradition. The political stability of the island was damaged and the possibility of continued British possession was threatened

A topological insulator surface under strong Coulomb, magnetic and disorder perturbations

Three dimensional topological insulators embody a newly discovered state of matter characterized by conducting spin-momentum locked surface states that span the bulk band gap as demonstrated via spin-resolved ARPES measurements . This highly unusual surface environment provides a rich ground for the discovery of novel physical phenomena. Here we present the first controlled study of the topological insulator surfaces under strong Coulomb, magnetic and disorder perturbations. We have used interaction of iron, with a large Coulomb state and significant magnetic moment as a probe to \textit{systematically test the robustness} of the topological surface states of the model topological insulator Bi$_2$Se$_3$. We observe that strong perturbation leads to the creation of odd multiples of Dirac fermions and that magnetic interactions break time reversal symmetry in the presence of band hybridization. We also present a theoretical model to account for the altered surface of Bi$_2$Se$_3$. Taken collectively, these results are a critical guide in manipulating topological surfaces for probing fundamental physics or developing device applications.Comment: 14 pages, 4 Figures. arXiv admin note: substantial text overlap with arXiv:1009.621