نتایج جستجو برای: ism solar spicules
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Silicateins, members of the cathepsin L family, are enzymes that have been shown to be involved in the biosynthesis/condensation of biosilica in spicules from Demospongiae (phylum Porifera), e.g. Tethya aurantium and Suberites domuncula. The class Hexactinellida also forms spicules from this inorganic material. This class of sponges includes species that form the largest biogenic silica structu...
We identify a new structure-property connection in the skeletal elements of the marine sponge Tethya aurantia. The skeletal elements, known as spicules, are millimeter-long, axisymmetric, silica rods that are tapered along their lengths. Mechanical designs in other structural biomaterials, such as nacre and bone, have been studied primarily for their benefits to toughness properties. The struct...
Introduction: A number of now extinct shortlived nuclides, with half-lives ranging from ~10 (Ca) to 10 years (Sm), were present in the early Solar System and provide constraints on chronometry, nucleosynthetic sources of early Solar System materials and provide a tool for identifying the environment where the Solar System formed (such as isolated star formation versus formation in a cluster of ...
Presolar grains are rare sub-micron-to-micron-sized components of primitive chondrites and interplanetary dust particles (IDPs), and are identified on the basis of their highly anomalous isotopic compositions [e.g., 1]. They formed around evolved stars prior to Solar System formation, and survived impact and radiation processing in the interstellar medium and early Solar System, before eventual...
We present initial results from the first optical spectroscopic survey of high latitude Galactic cirrus clouds. The observed shape of the cirrus spectrum does not agree with that of scattered ambient Galactic starlight. This mismatch can be explained by the presence of Extended Red Emission (ERE) in the diffuse interstellar medium, as found in many other astronomical objects, probably caused by...
the rotation curves of a sample of 46 low- and high-surface brightness galaxies are considered in the context of milgrom's modi_ed dynamics (mond) to test a new interpolating function proposed by zhao et al. (2010) [1] and compare with the results of simple interpolating function. the predicted rotation curves are calculated from the total baryonic matter based on the b-band surface photometry,...
it is inferred from the symmetrical and luminous x-ray emission of fossil groups that they are mature, relaxed galaxy systems. cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (bggs), the central early-t...
Abstract We derive the nonthermal velocities (NTVs) in transition region of an active using Si iv 1393.78 Å line observed by Interface Region Imaging Spectrograph and compare them with line-of-sight photospheric magnetic fields obtained Helioseismic Magnetic Imager on board Solar Dynamics Observatory. The consists two strong field regions opposite polarity, separated a weak corridor that widene...
We analyze the large-scale two-dimensional sidereal anisotropy of multi-TeV cosmic rays by Tibet Air Shower Array, with the data taken from 1999 November to 2008 December. To explore temporal variations of the anisotropy, the data set is divided into nine intervals, each in a time span of about one year. The sidereal anisotropy of magnitude about 0.1% appears fairly stable from year to year ove...
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