نتایج جستجو برای: 30 cm disk
تعداد نتایج: 689375 فیلتر نتایج به سال:
Mechanized agriculture is increasing rapidly in the Cerrado region of Brazil, causing concerns about water quality, off-site impacts, and sustainability. Our objective was to determine the impact of tillage on soil biological activity and aggregate stability in an Oxisol typical to the region. Three different tillage practices common to the Cerrado region (no-till, disk harrow, and disk plow) a...
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...
Methods of seedbed preparation affect establishment, growth and yield of crops via manipulating physical and chemical properties of soil. These effects on wheat-mungbean double-cropping have not been studied in Isfahan. Therefore, the influences of various seedbed preparation methods on soil physical properties and nutrients content and on establishment of mungbean (experimental line 1-61-16) w...
We present a model for the photoevaporation of circumstellar disks or dense clumps of gas by an external source of ultraviolet radiation. Our model includes the thermal and dynamic e†ects of 6È13.6 eV far-ultraviolet (FUV) photons and Lyman continuum EUV photons incident upon disks or clumps idealized as spheres of radius and enclosed mass For sufficiently large values of the radiation r d M * ...
An experimental investigation into material transfer and wear has been performed for the case of a ferrite probe sliding at high speeds (between 25 cm/set and 1250 cm/set) and low loads (10 gm) on a steel disk, a nickel plated disk, and a polymercoated disk, the latter containing finely dispersed abrasive particles. Autoradiographic methods together with microdensitometer analysis have been app...
We present a new joint analysis of pulsar dispersion measures and diffuse Hα emission in the Milky Way, which we use to derive the density, pressure and filling factor of the thick disk component of the warm ionised medium (WIM) as a function of height above the Galactic disk. By excluding sightlines at low Galactic latitude that are contaminated by H II regions and spiral arms, we find that th...
Researchers have found a big interest in biological application of Fourier Transform Infrared (FTIR) spectroscopy. Evaluating many diseases, staging them and studying the chemical structures of different formed compounds in diseases are some of the research applications of FTIR. Cancer is also one of these diseases. Researchers are trying to set up FTIR methods to detect and diagnose cancer cel...
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