نتایج جستجو برای: 35 cm disk
تعداد نتایج: 371666 فیلتر نتایج به سال:
We report on the first results of a search for molecular hydrogen emission from protoplanetary disks using CRIRES, ESO's new VLT Adaptive Optics high resolution near-infrared spectrograph. We observed the classical T Tauri star LkHα 264 and the debris disk 49 Cet, and searched for υ = 1 − 0 S(1) H 2 emission at 2.1218 µm, υ = 1 − 0 S(0) H 2 emission at 2.2233 µm and υ = 2 − 1 S(1) H 2 emission ...
The optical disk is a computer-addressable binary storage medium with very high capacity. More than 1010 bits of information can be recorded on a 12-cm-diameter optical disk. The natural two-dimensional format of the data recorded on an optical disk makes this medium particularly attractive for the storage of images and holograms, while parallel access provides a convenient mechanism through wh...
Abstract. We present mass distributions obtained from near-infrared (NIR) surface brightness decompositions and rotation curve fitting of a sample of early-type spiral galaxies. Bulge and disk mass-to-light (M/L) ratios, dark halo parameters, and the modified Newtonian dynamics (MOND) acceleration parameter are derived. We find that the mean disk NIR M/L is higher than that of the bulge, and co...
Necessary quality of soil cultivation is not always achieved by disk plough-harrows. To solve this problem the improved working unit - flat hexagonal was proposed. The aim investigation to determine dependence functional efficiency tilling implement with bodies on its mechanical and technological parameters. process interaction plant residues a subject investigation. assess tillage depending ap...
A detailed study of nearby, morphologically normal Sa galaxies reveals that about half show some spectrocopic evidence for kinematically distinct components despite their undisturbed optical appearance. In eight of nine objects mapped in the 21 cm HI line, the HI distribution extends far outside the optical disk and warps of the HI disk are complex. The multiwavelength evidence can be interpret...
Context. The growth of dust grains from sub-μm to mm and cm size is the first step towards the formation of planetesimals. Theoretical models of grain growth predict dust properties to change as a function of disk radius, mass, age and other physical conditions. High angular resolution observations at several (sub-)mm wavelengths constitute the ideal tool to directly probe the bulk of dust grai...
Context. The growth of dust grains from sub-μm to mm and cm sizes is the first step towards the formation of planetesimals. Theoretical models of grain growth predict that dust properties change as a function of disk radius, mass, age, and other physical conditions. High angular resolution observations at several (sub-)mm wavelengths constitute the ideal tool with which to directly probe the bu...
در این پژوهش رنگبری و تخریب دو آلاینده راکتیو اورنج 7 و فورفورال توسط فرآیند اکسیداسیون پیشرفته و با استفاده از آند ti/sb-sno2 در راکتور جاری بررسی شد. برای تصفیه راکتیو اورنج 7 از راکتور جاری در دو حالت برگشتی و پیوسته، و برای تصفیه فورفورال از راکتور جاری در حالت برگشتی استفاده شد. به منظور طراحی آزمایش ها و بهینه سازی عوامل موثر در فرآیند ها، روش پاسخ سطح (rsm) مورد استفاده قرار گرفت. در فرآ...
Context. Asteroid (130) Elektra belongs to one of the six known triple asteroids in the main belt, so its mass has been reliably determined. Aims. We aim to use all available disk-resolved images of (130) Elektra obtained by the SPHERE instrument at VLT and by the Nirc2 of the Keck telescope together with the disk-integrated photometry to determine its shape model and its size. The volume can b...
Aims. To study the properties of X-ray emission from young stellar objects (YSOs) through their evolution from Class I to Class III and determine whether Class 0 protostars emit X-rays. Methods. A deep Chandra X-ray observation of the Serpens star-forming region was obtained. The Serpens Cloud Core is ideally suited for this type of investigation, being populated by a dense and extremely young ...
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