A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star kappa Cancri

We present a pilot study on non-local thermodynamic equilibrium (NLTE) line-formation computations for the isotopes 3He and 4He in the mercury-manganese star kappa Cancri. The impact of NLTE effects on the determination of isotopic abundances and the vertical stratification of helium in the atmosphere is investigated. Modern NLTE line-formation computations were employed to analyse a high-resolution and high signal-to-noise ratio ESO-VLT/UVES spectrum of kap Cnc. The atmospheric parameters were determined from fitting the hydrogen Balmer lines and the spectral energy distribution. Multiple HeI lines were investigated, including HeI 4921A and 6678A, which show the widest isotopic splits. Half of the observed HeI lines in the spectrum of kap Cnc show significant NLTE strengthening, the effects are strongest in the red lines HeI 5875A and HeI 6678A. NLTE abundances from individual HeI lines are up to a factor of about 3 lower than LTE values. Helium is found to be stratified in the atmosphere of kap Cnc. While the LTE analysis indicates a step-like profile of the helium abundance, a gradual decrease with height is indicated by the NLTE analysis. A 3He/4He ratio of about 0.25-0.30 is found. With the available data it cannot be decided whether the two isotopes follow the same stratification profile, or not. This work implies that NLTE effects may be ubiquitous in the atmospheres of HgMn stars and may have a significant impact on abundance determinations and the interpretation of the vertical abundance stratification of elements.Comment: 7 pages, 9 figure

First Natural Endocranial Cast of a Fossil Snake (Cretaceous of Patagonia, Argentina)

In this study, we describe a natural endocranial cast included in a partially preserved medium‐sized skull of the Upper Cretaceous South American snake Dinilysia patagonica. The endocast is composed of sedimentary filling of the cranial cavity in which the posterior brain, the vessels, the cranial nerves, and the inner ear surrounded by delicate semicircular canals, are represented. It is simple in form, with little differentiation between the three main areas (Forebrain, Midbrain, and Hindbrain), and without flexures. The nervous system is well preserved. The posterior brain surface is smooth, except for two small prominences that make up the cerebellum. A large inner ear is preserved on the right side; it consists of a voluminous central mass, the vestibule, which occupies most of the space defined by the three semicircular canals. In particular, the lateral semicircular canal is very close to the vestibule. This characteristic, in combination with the medium to large body size of Dinilysia, its large skull and dorsally exposed orbits, and vertebrae bearing a rather high neural spine on a depressed neural arch, suggests that this snake would have had a semifossorial lifestyle.Fil: Trivino, Laura Natalia. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. División Zoología de Vertebrados. Sección Herpetologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Albino, Adriana Maria. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Dozo, Maria Teresa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; ArgentinaFil: Williams, Jorge Daniel. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. División Zoología de Vertebrados. Sección Herpetologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

The activity-based costing model trajectory: A path of lights and shadows

Purpose: To present a literature review showing the trajectory of the ABC model. Design/methodology: Literature review. Findings: This paper analyzes the history of the ABC model and its dissemination process, in the form of articles published in the specialized press. Research limitations/implications: The bibliometric study has been carried out based on specialized journals. Practical implications: Before a new strategic management tool is adopted, its strategic or operational contribution to the organization should be analyzed. The adoption of new tools based on current trends or as part of mimetic processes, could imply financial investments that do not produce the desired effects. Originality/value: This work is an analysis of the trajectory of the ABC model from its appearance to the present time.Peer Reviewe

Mathematical modeling of thermal stabilization of vertical wells on high performance computing systems

Temperature stabilization of oil and gas wells is used to ensure stability and prevent deformation of a subgrade estuary zone. In this work, we consider the numerical simulation of thermal stabilization using vertical seasonal freezing columns. A mathematical model of such problems is described by a time-dependent temperature equation with phase transitions from water to ice. The resulting equation is a standard nonlinear parabolic equation. Numerical implementation is based on the finite element method using the package Fenics. After standard purely implicit approximation in time and simple linearization, we obtain a system of linear algebraic equations. Because the size of freezing columns are substantially less than the size of the modeled area, we obtain mesh refinement near columns. Due to this, we get a large system of equations which are solved using high performance computing systems.Comment: 9 pages, 5 figure

The role of microstructure in fatigue crack initiation and propagation in 9-12Cr ferritic-martensitic steels

The present paper presents low-cycle fatigue results about cyclic behaviour, the evolution of the dislocation structure and the nucleation and propagation of microstructural cracks in commercial ferritic-martensitic steel AISI 410.Fil: Batista, Maria Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Hereñu, Silvina Andrea Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Alvarez, Iris. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentin

PEMANFAATAN INFORMASI ENSO GUNA EVALUASI PENANGGALAN BERCOCOK TANAM PRANATA MANGSA SEBAGAI UPAYA ADAPTASI PERUBAHAN IKLIM

PEMANFAATAN INFORMASI ENSO GUNA EVALUASI PENANGGALAN BERCOCOK TANAM PRANATA MANGSA1) Maria Natalia Pratiwi2), Komariah3), Noorhadi4) Program Studi Agroteknologi, Fakultas Pertanian Universitas Sebelas Maret (UNS) Surakarta ABSTRAK Swasembada pangan yang gencar dicanangkan tanpa menghiraukan adanya perubahan iklim dapat berdampak pada sistem pola tanam dan hasil panen. Salah satu langkah yang dapat diambil adalah dengan kembali pada kearifan lokal, antara lain pranata mangsa. Penelitian ini bertujuan untuk menganalisis keterkaitan ENSO dengan dinamika cuaca lokal dan pranata mangsa selanjutnya mengevaluasi pranata mangsa. Penelitian dilaksanakan pada Juni hingga Desember 2014 di Desa Pucangmiliran (Kecamatan Tulung), Desa Karangpandan (Kecamatan Karangpandan) dan Desa Pereng (Kecamatan Mojogedang) dengan metode survei bersifat deskriptif eksploratif. Analisis data menggunakan uji korelasi. Jenis data yang digunakan adalah data primer dan sekunder yang diperoleh melalui observasi, wawancara dan dari instansi terkait. ENSO berpengaruh kecil terhadap curah hujan dan pranata mangsa, sedangkan curah hujan memiliki hubungan erat dengan pranata mangsa sehingga digunakan untuk mengevaluasi pranata mangsa. Kata kunci: perubahan iklim, cuaca lokal, curah hujan 1) Makalah ini disampaikan pada seminar hasil penelitian tingkat Sarjana Fakultas Pertanian, Universitas Sebelas Maret Surakarta pada tanggal 10 Juli 2015. 2) Penulis adalah mahasiswa Program Studi Agroteknologi Fakultas Pertanian Universitas Sebelas Maret Surakarta. 3) Pembimbing Utama dari Penulis. Pembimbing Pendamping dari Penulis

Patienten in getallen:wiskunde in de klinische neurofysiologie

Inaugurele rede bij benoeming tot adjunct-hoogleraar Biomedische signaalanalyse i.h.b. de klinische neurofysiologi

Who takes the cake Effects of ECB monetary policy across income classes

This work provides evidence on the effects of monetary policy on the income class structure via stimulating economic activity and employment in Eurozone countries over the period 2007Q32016Q1. Based on European Union Statistics on Income and Living Conditions (EU-SILC) data, we compute the share of the market income perceived by each income class (lower, lower-middle, upper-middle, and upper) for the states that originated the Economic and Monetary Union (EMU11). We analyse the impact of monetary policy impulses under a Bayesian Vector Autoregressive approach and find that a monetary easing shock involving a decrease in nominal interest rates tends to increase the income share of middle classes at the expense of a smaller income share of the upper class, while, the lower class is not significantly affected. Our findings highlight the identified effects are mostly triggered by short-term interest rates cuts as long as they tend to vanish as the monetary policy proxy is located further in the yield curve. This suggests that the egalitarian impacts of monetary policy on market income distribution are to a lesser extent driven by decisions modifying longer-term interest rates.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech