65 research outputs found
New geometry and technology of face-gear forming with circle line of teeth on CNC milling machine
Different types of geometric models of face-gear with circle line of teeth have been shown in the paper. Generation of a new geometrical of a face-gear is performed on CNC milling machine. The basic direction of the development geometrical of a face-gear and technology is in the search of new trends and methods focused on improving the quality of products, shortening the production cycles, their mechanizations, automation and implementation of a high-precision technology
Nova geometrija i tehnologija oblikovanja hipoidnih zupÄanika na CNC glodalici
Different types of geometric models of face-gear with circle line of teeth have been shown in the paper. Generation of a new geometrical of a face-gear is performed on CNC milling machine. The basic direction of the development geometrical of a face-gear and technology is in the search of new trends and methods focused on improving the quality of products, shortening the production cycles, their mechanizations, automation and implementation of a high-precision technology.RazliÄiti tipovi geometrijskih modela hipoidnih zupÄanika su prikazani u radu. Izrada novog geometrijskog oblika zupÄanika je provedena na CNC glodalici. Temeljni smjer razvoja geometrijskih oblika zupÄanika i tehnologije izrade je u traženju novih trendova i metoda za unaprjeÄenje kvalitete proizvoda, skraÄenja trajanja proizvodnog ciklusa, njegova mehanizacija, automatizacija iimplementacija visokoprecizne tehnologije
Mjerenje ravnosti dugaÄkih strojnih vodilica
This paper shows the guideway types of large machines and describes problems with their straightness measurement. A short description of straightness measurement methods and the results of investigation in straightness of 10 meter long guideways of a CNC machine by means of the XL-10 Renishaw interferometer are also presented.Rad prikazuje tipove vodilica velikih strojeva i opisuje probleme mjerenja njihove ravnosti. Dat je takoÄer i opis metoda mjerenja ravnosti, te rezultati ispitivanja ravnosti 10 metarskih vodilica CNC stroja pomoÄu XJ-10 Renishawovog interferometra
Expression of calpain-calpastatin system (CCS) member proteins in human lymphocytes of young and elderly individuals; pilot baseline data for the CALPACENT project.
Ubiquitous system of regulatory, calcium-dependent, cytoplasmic proteases ā calpains ā and their
endogenous inhibitor ā calpastatin ā is implicated in the proteolytic regulation of activation, proliferation, and
apoptosis of many cell types. However, it has not been thoroughly studied in resting and activated human
lymphocytes yet, especially in relation to the subjectsā ageing process. The CALPACENT project is an international
(Polish-Italian) project aiming at verifying the hypothesis of the role of calpains in the function of peripheral blood
immune cells of Polish (Pomeranian) and Italian (Sicilian) centenarians, apparently relatively preserved in comparison
to the general elderly population. In this preliminary report we aimed at establishing and comparing the baseline
levels of expression of Ī¼- and m-calpain and calpastatin in various, phenotypically defined, populations of human
peripheral blood lymphocytes for healthy elderly Sicilians and Poles, as compared to these values observed in
young cohort
Charge-sensitive vibrational modes in the (EDT-TTF-OX)2AsF6 chiral molecular conductors
Infrared and Raman spectra of three chiral molecular conductors (EDT-TTF-OX)2AsF6, comprising of two salts based on enantiopure EDT-TTF-OX donor molecules and one based on their racemic mixture, have been measured as a function of temperature. In the frequency range of the C=C stretching vibrations of EDT-TTF-OX, charge-sensitive modes are identified based on theoretical calculations for neutral and oxidized EDT-TTF-OX using density functional theory (DFT) methods. The positions of C=C stretching modes in both Raman and infrared spectra of the (EDT-TTF-OX)2AsF6Ā materials are analyzed assuming a linear relationship between the frequency and charge of the molecule. The charge density on the EDTTTF-OX donor molecule is estimated to be +0.5 in all investigated materials and does not change with temperature. Therefore we suggest, that M-I transition observed in (EDT-TTF-OX)2AsF6Ā chiral molecular conductors at low temperature is not related to the charge ordering mechanism
Pulsar shadow as the origin of double notches in radio pulse profiles
We present the model of eclipsing a rotating, spatially extended source of
directional emission by a central absorber, and apply it to the pulsar
magnetosphere. The model assumes the radially extended inward radio emission
along the local direction of the magnetic field, and the pulsar as the
absorber. The geometry of the magnetic field lines of the rotating dipole is
favourable for the double eclipse events, which we identify with the double
notches observed in pulse profiles of nearby pulsars. For pulsars with large
dipole inclinations 70 <~ alpha <~ 110 deg the double notches are predicted to
occur within a narrow phase range of 20 to 30 deg before the main radio peak.
Application of the model to PSR B0950+08 establishes it as a nearly orthogonal
rotator (alpha =~ 75 deg, beta =~ -10 deg) with many pulse components naturally
interpreted in terms of the inward radio emission from a large range of
altitudes. The inward components include the intermittently strong, leading
component of the main pulse, which would traditionally have been interpeted as
a conal emission in the outward direction. The model also identifies the
magnetic field lines along which the radially extended inward radio emission
occurs in B0950+08. These have a narrow range of the footprint parameter s
close to 1.1 (closed field line region, near the last open field lines). We
describe directional characteristics of inward emission from the radially
extended region and compare them with characteristics of extended outward
emission. Our work shows that pulse profiles of at least some pulsars may be a
superposition of both inward and outward emission.Comment: 28 pages, 13 figures, accepted by ApJ, high-quality figures are
available from http://www.ncac.torun.pl/~michalf/inward1_figs
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