Cu-Au type orderings in the staggered quadrupolar region of the fcc Blume Emery Griffiths model

The spin-1 Ising (BEG) model has been simulated using a cellular automaton (CA) algorithm improved from the Creutz cellular automaton (CCA) for a face-centered cubic (fcc) lattice. The ground state diagram ($k$, $d$) of the fcc BEG model has ferromagnetic ($F$), quadrupolar ($Q$) and staggered quadrupolar ($SQ$) ordering regions. The simulations have been made in the staggered quadrupolar region for the parameter values in the intervals $-24\leq d=D/J<0$ and $-3\leq k=K/J\leq 0$ . The phase diagrams on the ($kT_{C}/J$, $d$) and the ($kT_{C}/J$, $k$) planes have been obtained through $k=-3$ and $d=-4$ lines, respectively. The staggered quadrupolar ordering region separates into five ordering regions ($A_{3}B(a)$, $A_{3}B(f)$, $AB$ (type-I), $AB$(type-II) and $AB_{3}(f)$) which have the different stoichiometric Cu-Au type structures.Comment: 24 pages, 11 figure

Post-exercise contractility, diastolic function, and pressure: Operator-independent sensor-based intelligent monitoring for heart failure telemedicine

<p>Abstract</p> <p>Background</p> <p>New sensors for intelligent remote monitoring of the heart should be developed. Recently, a cutaneous force-frequency relation recording system has been validated based on heart sound amplitude and timing variations at increasing heart rates.</p> <p>Aim</p> <p>To assess sensor-based post-exercise contractility, diastolic function and pressure in normal and diseased hearts as a model of a wireless telemedicine system.</p> <p>Methods</p> <p>We enrolled 150 patients and 22 controls referred for exercise-stress echocardiography, age 55 ± 18 years. The sensor was attached in the precordial region by an ECG electrode. Stress and recovery contractility were derived by first heart sound amplitude vibration changes; diastolic times were acquired continuously. Systemic pressure changes were quantitatively documented by second heart sound recording.</p> <p>Results</p> <p>Interpretable sensor recordings were obtained in all patients (feasibility = 100%). Post-exercise contractility overshoot (defined as increase > 10% of recovery contractility vs exercise value) was more frequent in patients than controls (27% vs 8%, p < 0.05). At 100 bpm stress heart rate, systolic/diastolic time ratio (normal, < 1) was > 1 in 20 patients and in none of the controls (p < 0.01); at recovery systolic/diastolic ratio was > 1 in only 3 patients (p < 0.01 vs stress). Post-exercise reduced arterial pressure was sensed.</p> <p>Conclusion</p> <p>Post-exercise contractility, diastolic time and pressure changes can be continuously measured by a cutaneous sensor. Heart disease affects not only exercise systolic performance, but also post-exercise recovery, diastolic time intervals and blood pressure changes – in our study, all of these were monitored by a non-invasive wearable sensor.</p

Diastolic time – frequency relation in the stress echo lab: filling timing and flow at different heart rates

A cutaneous force-frequency relation recording system based on first heart sound amplitude vibrations has been recently validated. Second heart sound can be simultaneously recorded in order to quantify both systole and diastole duration

Sonate (Sol majeur). Arrangée pour violon avec accompagnement de piano

Cover title

Seismic evidence of gas Hydrates and their quantification as a potential economic resource in the Argentine sea, Malvinas Basin

El presente trabajo describe tanto la detección de hidratos de gas en sísmica de exploración del offshore argentino de la cuenca de Malvinas, como el estimativo del potencial económico que representan. Para ello se emplea un flujo de trabajo que consiste en tres etapas bien diferenciadas y con objetivos específicos: detección de la presencia de hidratos de gas en datos de sísmica de prospección, validación y análisis de horizontes interpretados y, por último, estimación del volumen de gas recuperable. De este modo se obtienen evidencias de importantes reservas de hidratos de gas de metano, lo que implica una experiencia relevante en la búsqueda de energías alternativas en la Argentina.We present a workflow for gas hydrate detection and quantification that has been applied on seismic data of the Argentinean offshore of Malvinas Basin. The workflow consists in three main stages: gas hydrate detection, validation and characterization of the gas hydrate and finally, volume estimation. Evidence of an important methane gas hydrate concentration lying below the Argentinean seabed is gathered.Fil: Gómez, Julián Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Späth, F. G. E.. YPF - Tecnología; ArgentinaFil: Pianelli, L.. YPF - Tecnología; Argentin

Preparation of alumina-chromium composites by reactive hot-pressing A1 + Cr2O3 based powders

Chromium-Alumina based composites have been obtained by reactive sintering under load and vacuum of various powder blends. The starting mixtures have been prepared from commercially available aluminium metal, chromium and aluminium oxides, and a thermally unstable titanium compound respectively. Differential thermal analysis (DTA) and differential calorimetry (DSC) as well as X-ray diffraction were used to identify chemical transformations taking place within the system. Microstructure changes were observed via scanning electron microscopy (SEM) with an energy dispersive spectroscopy system (EDS). Chemical reactions in relevant binary subsystems have been investigated qualitatively in order to understand the course of events in the more complex quaternary mixtures. The possibilities of forming intermetallic phases in both the Al-Ti and Cr-Ti systems and of dissolving some Cr2O3 into the product Al2O3 phase have been considered. The influence of such parameters as thermal schedule and initial aluminium content on those side reactions and the resulting microstructures was investigated

Surgical treatment of fifth metacarpal neck fractures: antegrade intramedullary nailing versus transverse percutaneous pinning

BACKGROUND: To compare clinical and radiographic outcomes of antegrade intramedullary pinning (AIMN) and transverse percutaneous pinning (TPP) for the treatment of fifth metacarpal neck fractures.METHODS: A retrospective study was performed on patients surgically treated for a fifth metacarpal neck fracture be-tween 2009 and 2019. Sixty-three patients were included, divided into two groups according to the type of fixation: 33 pa-tients underwent surgery using antegrade intramedullary technique and 30 with transverse pinning. Clinical outcome was evaluated with DASH score, VAS, and active ROM. Volar angulation and shortening were determined on radiographs using DC-30 and SH-Stip methods, respectively. Healing time, return to work and complications were also assessed.RESULTS: Antegrade intramedullary pinning group showed significantly better outcome than transverse pinning in terms of DASH score, VAS score, return to work and fracture angulation. CONCLUSIONS: Antegrade intramedullary nailing provided better clinical and radiological outcomes than TPP. We found that AIMN technique resulted in better hand function, less residual pain and faster return to work. It also ensured a better fracture angulation correction

Sulcus Angle, Trochlear Depth, and Dejour's Classification Can Be Reliably Applied To Evaluate Trochlear Dysplasia: A Systematic Review of Radiological Measurements

Purpose: To summarize data on the reliability of available imaging criteria for the assessment of trochlear dysplasia and to assess the methodological quality of the included studies. Methods: This systematic review was conducted following the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guideline. Search was performed using major electronic databases from their inception to September 2021. All studies enrolling patients of any age who underwent a radiological exam to rule out features related to trochlear dysplasia were included. After the identification of available imaging criteria, reliability studies were analyzed. Descriptive statistics were used to summarize findings. Methodological quality was assessed using the Quality Appraisal of Reliability studies checklist. Results: A total of 2391 articles were identified, and 33 articles comprising 3036 patients with a mean age of 28.6 years were included. Thirty different measurements were extracted. Magnetic resonance imaging (MRI) was the most used imaging modalities (21 studies), followed by computed tomography (10 studies), conventional radiology (8 studies) and ultrasonography (US) (1 study). Sulcus angle, trochlear depth, and Dejour's classification were the most explored measurements. Overall, sulcus angle can be reliably assessed on radiography, CT and MRI, whereas trochlear depth can be reliably measured only with CT and MRI. Reliability of Dejour's classification ranged from poor or fair to very good for all imaging modalities. Methodological quality of included studies varied from 2 to 9 positive items out of 11 possible. Twenty-four studies (72.7%) were considered at high risk of bias. Conclusion: Trochlear dysplasia can be reliably evaluated at least with 3 measurements: sulcus angle, trochlear depth and Dejour's classification. Methodological quality assessment showed high risk of bias in most included studies. Level of evidence: Level III, systematic review of Level II-III studies