نتایج جستجو برای: 30 cm disk
تعداد نتایج: 689375 فیلتر نتایج به سال:
Formaldehyde (H2CO) is an important precursor to organics like methanol (CH3OH). It understand the conditions that produce H2CO and prebiotic molecules during star planet formation. possesses both gas-phase solid-state formation pathways, involving either UV-produced radical precursors or CO ice cold (?20 K) dust grains. To which pathway dominates, gaseous H2CO's ortho-to-para ratio (OPR) has b...
This paper describes the creation of a Unix-compatible le system with highly scalable performance and size. The le system is on the CM-5 backed by a scalable array of disks. Using the Unix le system (UFS) from the SunOS 4.1.2 kernel as a base and modifying it to support Connection Machine (CM) operations, we have created a new le system, the scalable le system, or sfs. We discuss the CM operati...
Multi-wavelength observations of protoplanetary disks in the sub-millimeter continuum have measured spectral indices values which are significantly lower than what is found in the diffuse interstellar medium. Under the assumption that mm-wave emission of disks is mostly optically thin, these data have been generally interpreted as evidence for the presence of mm/cm-sized pebbles in the disk out...
We present a map of 511 keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately ∼ 95% of the celestial sphere. Within the exposed sky area, 511 keV line emission is significantly detected towards the galactic bulge region and, at a very low level, from the galactic disk. The bulge emi...
Type I X-ray bursts and superbursts on neutron stars release sudden and intense radiation fields into their surroundings. Here, we consider the possible effects of these powerful explosions on the structure of the accretion disk. The goal is to account for the apparent evolution of the innermost regions of the accretion disk around 4U 1820–30 during a superburst. Three different processes are c...
We report on two pulse compressors for a high-power thin disk laser oscillator using rod-type fiber amplifiers. Both systems are seeded by a standard SESAM modelocked thin disk laser that delivers 16 W of average power at a repetition rate of 10.6 MHz with a pulse energy of 1.5 μJ and a pulse duration of 1 ps. We discuss two results with different fiber parameters with different trade-offs in p...
This experiment was carried out at National Research Station of Ornamental Plants, Mahallat, Iran, to investigate the effect of different substrates on growth and yield of gerbera flower. The experimental design was randomized complete blocks, using 14 treatments with 3 replications as: fine sand, peat + fine sand (25% + 75%), peat + fine sand (50% + 50%), perlite + peat (75% + 25%), perlite + ...
Aims. Study the connection between the masing disk and obscuring torus in Seyfert 2 galaxies. Methods. We present a uniform X-ray spectral analysis of the high energy properties of 14 nearby megamaser Active Galactic Nuclei observed by NuSTAR. We use a simple analytical model to localize the maser disk and understand its connection with the torus by combining NuSTAR spectral parameters with ava...
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