Taxonomic and biogeographic analysis of the Allolobophora sturanyi species group (Oligochaeta, Lumbricidae)

Morphometric and biogeographic analysis of the Allolobophora sturanyi species group – containing A. sturanyi Rosa, 1895, Eophila dacica Pop, 1938 and A. sturanyi dacidoides Bouché, 1973 – proved that these taxa are distinct; consequently the proposed synonymy by Perel (1979) should be rejected. However, these taxa are morphologically close enough to regard them as subspecies of the polytypic Allolobophora sturanyi. The analysis also revealed a fourth, well separated group that represents a new species to science, Allolobophora prosellodacica sp. n

The influence of mercury vapor on the electrical resistance of chalcogenide amorphous films

Using the planar structures "Ni layer - chalcogenide amorphous film - Ni layer" and "graphite probe - chalcogenide amorphous film graphite probe" samples, the influence of mercury vapor on the electrical resistance of amorphous films of the Se-Te, Se-Sb and Se-As systems was investigated. It was established that exposure of samples in mercury vapor leads to a decrease in their electrical resistance by 4-7 orders of magnitude. As the temperature and mercury concentration increase, the transition time from a high-resistance state to a low-resistance state decreases. When introducing Te, Sb, and As into amorphous selenium and increasing their concentration in the composition of the films, the transition time increases, and the value of the change in resistance decreases. It was established that the change in resistance is mainly determined by the change in surface conductivity of chalcogenide films. A decrease in the electrical resistance of selenium-containing amorphous films modified with mercury is caused by the formation of HgSe crystalline inclusions in their matrix

Ensuring accurate characteristics of the pipe-piston installation

The study aims to increase the efficiency of the use of the pipe-piston unit by ensuring the reliability of the measurement results based on the development of calibrating technique for the pipe-piston installation. Theoretical research is based on using the principles of system and process approaches. To solve the scientific problem, the fundamental provisions of statistical methods and experimental methods were used; methods of mathematical modeling of estimation of measurement uncertainties. Based on the results of the work, the normative document “Metrology. Installations of a standard pipe-piston. Calibration technique”. The approach to controlling metrological characteristics of the pipe-piston installation, based on estimating the uncertainty of measurements during its calibration, was further developed. Application of the proposed approach allows one to control the metrological characteristics directly on site without disrupting the working product’s accounting process and increasing the pipe-piston installation’s efficiency by an increase in the reliability of measurements and ensuring repeatability

Structural Studies of Mercury-Modified Amorphous Films of the Selenium-Antimony System

The structure of mercury-modified amorphous films of the Se-Sb system was studied using the methods of X-ray diffractometry and Raman spectroscopy. It was ascertained that the structure of the phase that formed in the amorphous matrix of the films after their exposure in mercury vapor corresponds to the structure of crystalline mercury selenide in cubic modification. The structure of nominally pure and mercury-modified amorphous Se100Sbx films (x = 3, 5, 7, 9) was investigated using X-ray diffractometry and Raman spectroscopy. It is shown that the matrix of nominally pure films is built mainly by elements of Se8 rings and Sen helical chains and contains a certain number of SbSe3/2 structural groups. Exposure of the films in mercury vapor leads to formation of mercury selenide (HgSe) crystalline inclusions in the cubic modification in their near-surface layers, as well as to the activation of the process of formation and growth of Se crystalline inclusions of the trigonal modification in the film bulk

Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration

Extensive experimental data from high-energy nucleus-nucleus collisions were recorded using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The comprehensive set of measurements from the first three years of RHIC operation includes charged particle multiplicities, transverse energy, yield ratios and spectra of identified hadrons in a wide range of transverse momenta (p_T), elliptic flow, two-particle correlations, non-statistical fluctuations, and suppression of particle production at high p_T. The results are examined with an emphasis on implications for the formation of a new state of dense matter. We find that the state of matter created at RHIC cannot be described in terms of ordinary color neutral hadrons.Comment: 510 authors, 127 pages text, 56 figures, 1 tables, LaTeX. Submitted to Nuclear Physics A as a regular article; v3 has minor changes in response to referee comments. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.htm

Fragmentation and Multifragmentation of 10.6A GeV Gold Nuclei

We present the results of a study performed on the interactions of 10.6A GeV gold nuclei in nuclear emulsions. In a minimum bias sample of 1311 interac- tions, 5260 helium nuclei and 2622 heavy fragments were observed as Au projec- tile fragments. The experimental data are analyzed with particular emphasis of target separation interactions in emulsions and study of criticalexponents. Multiplicity distributions of the fast-moving projectile fragments are inves- tigated. Charged fragment moments, conditional moments as well as two and three -body asymmetries of the fast moving projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents gamma, beta and tau and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.Comment: latex, revtex, 28 pages, 12 figures, 3tables, submitted to Europysics Journal

Remarks on the species Dendrobaena jeanneli Pop, 1948 and its proposed synonymy with Octolasion cyaneum (Savigny, 1826) (Oligochaeta: Lumbricidae)

The type specimen of the dubious species Dendrobaena jeanneli Pop, 1948 was found in the Zoological Museum, Babes-Bolyai University, Cluj. An investigation of the somewhat softened and fragmented specimen allowed us to recognise its most important taxonomic characters such as the position of the clitellum and tubercles, the setal arrangement, the structure of the calciferous glands and the nephridial bladders. According to these characters this species belongs to the genus Octolasion Örley, 1885, and on the position of the clitellum and tubercles it is clearly identical with O. cyaneum (Savigny, 1826)

Photo-thermoinduced changes of transmission spectra of As₄₀-xSbxS₆₀ amorphous layers

The results of investigation of the As₄₀-xSbxS₆₀ (x = 0-10) thin films transmission spectra depending on exposure and heat treatment conditions are given. It was established that illumination and annealing of films leads to the absorption edge shift into the longwave spectral region. The values of pseudogap width Eg are determined. Optical characteristic changes of films are caused by photo-thermostructural transformations taking place in them under irradiation and annealing