“We report a theoretical investigation on the magnetocaloric properties of the cubic CsCl-type HoZn and ErZn compounds. Several anomalies in the magnetocaloric
quantities, Delta S(T) and Delta T(S), are observed due to spontaneous and/or field-induced spin reorientation transitions in these compounds. In HoZn, a discontinuity in the isothermal entropy change and in the adiabatic temperature change around T(1) = 23 K is ascribed to the spontaneous reorientation transition. Under a magnetic field variation from 0 up to 2 T in the < 110 > and < 100 > directions, an almost table-like behavior in Delta S(T) is predicted between T(1) and T(SR1). The peak around the ferromagnetic-paramagnetic transition temperature in the magnetocaloric quantities shows a dependence on the direction of the applied field. For mu(0)Delta H = 2 T, it reaches 11.9 J/kg K (magnetic field along Selleck β-Nicotinamide the < 111 > direction) and 7.9 J/kg K (magnetic field in the < 100 > direction). In ErZn there is also a dependence of Delta S(T) and Delta T(S) on field direction. From the analysis of the spin reorientations in both compounds we have GSK690693 built spin reorientation diagrams that summarize their temperature and field dependence. Our theoretical approach is based on a model Hamiltonian
that includes exchange, crystal field, and quadrupolar interactions. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554725]“
“Background: The increasing use of remote monitoring with the associated large retrievable databases provides a unique opportunity to analyze observations on implantable cardioverter-defibrillator
(ICD) therapies. Adjudication of a large number of stored ICD electrograms (EGMs) presents a unique challenge. The ALTITUDE study group was designed to use the LATITUDE remote monitoring system to evaluate ICD patient outcomes across the United States.
Methods and Results: Of 81,081 patients on remote monitoring, a random sample of 2,000 patients having 5,279 shock episodes was selected. The ALTITUDE EGM review committee was comprised of seven electrophysiologists LY2157299 datasheet from four institutions. An online EGM adjudication system was designed. Episodes were classified as appropriate (70% of shock episodes) or inappropriate ICD therapies (30%). Light’s Kappa was used to assess agreement.
Interobserver and intraobserver Kappa scores for dual-chamber ICDs were 0.84 (0.71-0.91) and 0.89 (0.82-0.95), consistent with substantial agreement. Interobserver and intraobserver Kappa scores for single-chamber ICDs were 0.61 (0.54-0.67) and 0.69 (0.59-0.79). The rhythm categories of “”nonsustained arrhythmia”" and “”polymorphic and monomorphic ventricular tachycardia”" resulted in the greatest degree of discordant adjudication between reviewers.