1,367 research outputs found
A New High Energy Photon Tagger for the H1 - Detector at HERA
The H1 detector at HERA has been upgraded by the addition of a new
electromagnetic calorimeter. This is installed in the HERA tunnel close to the
electron beam line at a position 8m from the interaction point in the electron
beam direction. The new calorimeter extends the acceptance for tagged
photoproduction events to the high y range, 0.85 < y < 0.95, and thus
significantly improves the capability of H1 to study high energy gamma-p
processes. The calorimeter design, performance and first results obtained
during the 1996-1999 HERA running are described.Comment: 17 pages, 16 figure
Phase-Space Metric for Non-Hamiltonian Systems
We consider an invariant skew-symmetric phase-space metric for
non-Hamiltonian systems. We say that the metric is an invariant if the metric
tensor field is an integral of motion. We derive the time-dependent
skew-symmetric phase-space metric that satisfies the Jacobi identity. The
example of non-Hamiltonian systems with linear friction term is considered.Comment: 12 page
Combination of the Sol-Gel and SHS-Technologies for Obtaining the Carbonauces Refractories
The present paper contains the results of the carbonaceous refractories SHS-synthesis carried out in the presence of nanodispersed silica added to the system by means of sol heterocoagulation. The SHSrefractory compositions have been optimized based on periclase-chromite and alumino-silicate mortars and their physical and technical properties have been determined. This material has been successfully used for lining of the induction melting furnace at one of the machinery plants
Tagging High Energy Photons in the H1 Detector at HERA
Measures taken to extend the acceptance of the H1 detector at HERA for
photoproduction events are described. These will enable the measurement of
electrons scattered in events in the high y range 0.85 < y < 0.95 in the 1998
and 1999 HERA run period. The improvement is achieved by the installation of an
electromagnetic calorimeter, the ET8, in the HERA tunnel close to the electron
beam line 8 m downstream of the H1 interaction point in the electron direction.
The ET8 will allow the study of tagged gamma p interactions at centre-of-mass
energies significantly higher than those previously attainable. The calorimeter
design and expected performance are discussed, as are results obtained using a
prototype placed as close as possible to the position of the ET8 during the
1996 and 1997 HERA running.Comment: 13 pages, 13 figure
Risk-oriented approach to ecological safety management at oil refinery
The article considers place and role of the risk-oriented approach in environmental management at enterprises, describes mechanisms for use of risk assessment in environmental management processes and documents, tools for use of risk characteristics in development and implementation of programmes and plans for oil refineries.The study relevance is based on the need to improve the environmental management system of “Orsknefteorgsintez” in line with the plans to include risk-oriented approach in supervisory work, including state environmental supervision.The main goal of the work was development of approaches to risk-oriented environmental management at “Orsknefteorgsintez” based on the health risk assessment from environment pollution, followed by interpretation of gained data and appropriate management decisions.The research was conducted in two stages. The first stage included health risk levels determination resulted from air pollution by “Orsknefteorgsintez”. The results included hygienic studies of human health risk assessment from negative impact by “Orsknefteorgsintez” considering the implementation of the middle-term enterprise development program; and results of comparative analysis of human health risk levels prior to and after operational commissioning of reconstructed objects within the middle-term enterprise development program. The recommendation on human health risk management from the “Orsknefteorgsintez” production facilities (including control and monitoring) are based on the results of the first stage.Risk-oriented improves environmental management systems at enterprises, helps in interactions with government bodies, enhances management decisions in line with environmental legislation and increases environmental-economic investment efficiency
Full-field swept-source optical coherence tomography and neural tissue classification for deep brain imaging
Optical coherence tomography can differentiate brain regions with intrinsic contrast and at a micron scale resolution. Such a device can be particularly useful as a realtime neurosurgical guidance tool. We present, to our knowledge, the first full-field swept-source optical coherence tomography system operating near a wavelength of 1310 nm. The proof-of-concept system was integrated with an endoscopic probe tip, that is compatible with deep brain stimulation keyhole neurosurgery. Neuroimaging experiments were performed on ex vivo brain tissues and in vivo in rat brains. Using classification algorithms involving texture features and optical attenuation, images were successfully classified into three brain tissue types
Synthesis and Characterization of Electro-Explosive Magnetic Nanoparticles for Biomedical Applications
Nowadays there are new magnetic nanostructures based on bioactive metals with low toxicity and high efficiency for a wide range of biomedical applications including drugs delivery, antimicrobial drugs design, cells' separation and contrasting. For such applications it is necessary to develop highly magnetic particles with less than100 nm in size. In the present study magnetic nanoparticles Fe, Fe[3]O[4] and bimetallic Cu/Fe with the average size of 60- 90 nm have been synthesized by electrical explosion of wire in an oxygen or argon atmosphere. The produced nanoparticles have been characterized with transmission electron microscopy, X-ray phase analysis, and nitrogen thermal desorption. The synthesized particles have shown antibacterial activity to gram-positive (S. aureus, MRSA) and gramnegative (E. coli, P. aeruginosa) bacteria. According to the cytological data Fe, Fe[3]O[4]and Cu/Fe nanoparticles have effectively inhibited viability of cancer cell lines Neuro-2a and J774. The obtained nanoparticles are promising for new antimicrobial drugs and antitumor agents' developmen
Synthesis and Characterization of Electro-Explosive Magnetic Nanoparticles for Biomedical Applications
Nowadays there are new magnetic nanostructures based on bioactive metals with low toxicity and high efficiency for a wide range of biomedical applications including drugs delivery, antimicrobial drugs design, cells' separation and contrasting. For such applications it is necessary to develop highly magnetic particles with less than100 nm in size. In the present study magnetic nanoparticles Fe, Fe[3]O[4] and bimetallic Cu/Fe with the average size of 60- 90 nm have been synthesized by electrical explosion of wire in an oxygen or argon atmosphere. The produced nanoparticles have been characterized with transmission electron microscopy, X-ray phase analysis, and nitrogen thermal desorption. The synthesized particles have shown antibacterial activity to gram-positive (S. aureus, MRSA) and gramnegative (E. coli, P. aeruginosa) bacteria. According to the cytological data Fe, Fe[3]O[4]and Cu/Fe nanoparticles have effectively inhibited viability of cancer cell lines Neuro-2a and J774. The obtained nanoparticles are promising for new antimicrobial drugs and antitumor agents' developmen
Topology of the spaces of Morse functions on surfaces
Let be a smooth closed orientable surface, and let be the space of
Morse functions on such that at least critical points of each
function of are labeled by different labels (enumerated). Endow the space
with -topology. We prove the homotopy equivalence where is one of the manifolds , and the point in dependence on the sign of ,
and is the universal moduli space of framed Morse
functions, which is a smooth stratified manifold. Morse inequalities for the
Betti numbers of the space are obtained.Comment: 15 pages, in Russia
Petojezični rečnik termina metalurgije praha : (srpskohrvatsko-ruski, englesko-ruski, nemačko-ruski, francusko-ruski). Deo 2
Petojezični rečnik termina metalurgije praha : (srpskohrvatsko-ruski, englesko-ruski, nemačko-ruski, francusko-ruski). Deo 2 / I. I. Kovenski ... [i dr.] ; u redakciji M. M. Ristića i A. N. Piljankeviča. - Beograd : Srpska akademija nauka i umetnosti : Institut tehničkih nauka Srpske akademije nauka i umetnosti : Univerzitet u Beogradu, 1983 (Beograd : Zavod za grafičku tehniku Tehnološko-metalurškog fakulteta Univerziteta u Beogradu). - 442 p. ; 24 cm.- (Posebna izdanja / Srpska akademija nauka i umetnosti [i] Institut tehničkih nauka SANU ; t. 552.Odeljenje tehničkih nauka ; knj. 24
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