Accurate Ritz wavelengths of parity-forbidden [Fe II], [Ti II] and [Cr II] infrared lines of astrophysical interest

With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical plasmas. We present improved, experimentally determined, energy levels for the lowest even LS terms of Fe II, Ti II and Cr II, along with accurate Ritz wavelengths for parity-forbidden transitions between and within these terms. Spectra of Fe II, Ti II and Cr II have been produced in a hollow cathode discharge lamp and acquired using high-resolution Fourier Transform (FT) spectrometry. The energy levels have been determined by using observed allowed ultraviolet transitions connecting the even terms with upper odd terms. Ritz wavelengths of parity-forbidden lines have then been determined. Energy levels of the four lowest Fe II terms (a$^{6}$D, a$^{4}$F, a$^{4}$D and a$^{4}$P) have been determined, resulting in 97 different parity-forbidden transitions with wavelengths between 0.74 and 87 micron. For Ti II the energy levels of the two lowest terms (a$^{4}$F and b$^{4}$F) have been determined, resulting in 24 different parity-forbidden transitions with wavelengths between 8.9 and 130 micron. Also for Cr II the energy levels of the two lowest terms (a$^{6}$S and a$^{6}$D) have been determined, in this case resulting in 12 different parity-forbidden transitions with wavelengths between 0.80 and 140 micron.Comment: Accepted for publication in A&A, 13 pages, 6 figures, 9 table

Oscillator Strengths and Damping Constants for Atomic Lines in the J and H Bands

We have built a line list in the near-infrared J and H bands (1.00-1.34, 1.49-1.80 um) by gathering a series of laboratory and computed line lists. Oscillator strengths and damping constants were computed or obtained by fitting the solar spectrum. The line list presented in this paper is, to our knowledge, the most complete one now available, and supersedes previous lists.Comment: Accepted, Astrophysical Journal Supplement, tentatively scheduled for the Sep. 1999 Vol. 124 #1 issue. Text and tables also available at http://www.iagusp.usp.br/~jorge

Coexistence of Renal Artery Aneurysm and Stenosis in The Course of Arterial Hypertension - Case Report

Jedną z najczęstszych przyczyn nadciśnienia tętniczego wtórnego jest zwężenie tętnicy nerkowej. Rolę zwężenia w patogenezie nadciśnienia tętniczego dobrze poznano i udowodniono. Inną, rzadką patologią tętnicy nerkowej jest tętniak. Opinie na temat jego roli w patogenezie nadciśnienia tętniczego są podzielone i zagadnienie to wymaga szerszych badań. W pracy przedstawiono przypadek 31-letniej pacjentki hospitalizowanej z powodu nadciśnienia tętniczego opornego na leczenie farmakologiczne. W trakcie diagnostyki obrazowej u chorej stwierdzono współistnienie w obrębie tętnicy nerkowej zwężenia oraz tętniaka. Wykonano przezskórną angioplastykę wewnątrznaczyniową istniejącego zwężenia. Tętniaka ze względu na rozmiary nie zakwalifikowano do leczenia zabiegowego. Po zabiegu wartości ciśnienia tętniczego znacznie zmniejszyły się, przy jednoczesnej redukcji leczenia farmakologicznego.Stenosis of renal artery is the one of most frequent reasons of secondary arterial hypertension. The role of stenosis in arterial hypertension patogenesis is well known and proved. Other rare pathology in renal artery is an aneurysm. Investigators differ in their opinions about the role of aneurysm in patogenesis of arterial hypertension and it reqire extensive studies. In this publication we described a case of 31 years old woman hospitalized with refractory arterial hypertension. Radiological examinations revealed coegsisting renal artery aneurysm and stenosis. Transcutaneus intra-arterial angioplasty of stenosis was performed. The aneurysm was not qualified to treatment becouse of its size. After surgery the blood pressure was considerably lower and pharmacological treatment was also significant reduced

A Spectroscopic study of laser-induced Tin-Lead plasma: transition probabilities for spectral lines of Sn I

In this paper, we present transition probabilities for 97 spectral lines of Sn I, corresponding to transitions n(n = 6,7,8)s → 5p2, n(n = 5,6,7)d → 5p2, 5p3 → 5p2, n(n = 7)p → 6s, determined by measuring the intensities of the emission lines of a Laser-induced breakdown (emission) spectrometry (LIBS). The optical emission spectroscopy from a laser-induced plasma generated by a 10 640 Å radiation, with an irradiance of 1.4 × 1010 Wcm− 2 on an Sn–Pb alloy (an Sn content of approximately 20%), in vacuum, was recorded at 0.8 µs, and analysed between 1900 and 7000 Å. The population-level distribution and corresponding temperature were obtained using Boltzmann plots. The electron density of the plasma was determined using well-known Stark broadening parameters of spectral lines. The plasma under study had an electron temperature of 13,200 K and an electron number density of 2 × 1016 cm− 3. The experimental relative transition probabilities were put on an absolute scale using the branching ratio method to calculate Sn I multiplet transition probabilities from available radiative lifetime data of their upper states and plotting the Sn I emission spectrum lines on a Boltzmann plot assuming local thermodynamic equilibrium (LTE) to be valid and following Boltzmann's law. The LTE conditions and plasma homogeneity have been checked. Special attention was paid to the possible self-absorption of the different transitions. The experimental results obtained have been compared with the experimental values given by other authors

The foetal development of the human osseous labyrinth in a computed tomographic study

A CT study was performed on 8 foetuses aged between 20 and 38 weeks. In foetuses at the 20th week the semicircular canals, the spiral canal of the cochlea and the initial (labyrinthine) part of the facial canal are visible. At week 24 the tympanic part of the facial canal is observed. In the 31st week the cochlea is divided into 2 compartments, and in the 38th week the vestibular aqueduct and osseous labyrinth are seen