By A. Atzei (auth.), Ezio Bussoletti, Carlo Fusco, Giuseppe Longo (eds.)
Astrophysical research on the subject of stable topic calls for information on homes and techniques. Such facts, besides the fact that, expecially acceptable to area stipulations are in general missing. It seemed then very tempting to collect jointly experimentalists, ob servers and theoreticians operating within the box of cosmic airborne dirt and dust and in similar parts. The Workshop held in Capri (Italy) from September eighth until eventually twelfth 1987 gave the members a different chance for trade of principles and discussions of difficulties and experimental techniques. Introductory stories have been ready with the purpose of giving the state-of-the-art approximately unmarried topics; contributed poster papers offered, to the contrary, very fresh leads to a few of the fields. in response to his particular curiosity every one attendant has additionally contributed to 3 operating teams respectively on a) carbon, b) silicates, c) ice and similar themes. Scientifical and technical difficulties approximately this stuff have been mentioned in nice element. even though no convinced solutions got, important symptoms pop out with a purpose to be of a few aid for destiny works. as well as the clinical efforts, the Capodimonte Observatory and the Istituto Universitario Navale sought to offer a hot welcome to the members. due to numerous sponsors, the LOC may possibly arrange a few tours and exhibits to entertain humans in the course of their spare time.
Read Online or Download Experiments on Cosmic Dust Analogues: Proceedings of the Second International Workshop of the Astronomical Observatory of Capodimonte (OAC 2), held at Capri, Italy, September 8–12, 1987 PDF
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Astrophysical research on the subject of good topic calls for facts on homes and procedures. Such info, although, expecially acceptable to area stipulations are in most cases missing. It seemed then very tempting to collect jointly experimentalists, ob servers and theoreticians operating within the box of cosmic dirt and in comparable parts.
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Additional resources for Experiments on Cosmic Dust Analogues: Proceedings of the Second International Workshop of the Astronomical Observatory of Capodimonte (OAC 2), held at Capri, Italy, September 8–12, 1987
A review of the extensive literature can be found by starting with papers by Halperin (1986), Devaty and Sievers (1984), Ruppin (1979) and the Thesis of Rathmann (1981). In recent work from the laboratory of Prof. " In work done in our laboratory we have repeated the production and measurement of aluminum particles and have extended the far infrared measurements (which agree rather well with the original work) into the near infrared. These results from the Thesis of Rathmann (1981) are shown in figure 5 as the triangles with the circles for the original work.
In this reference we also presented a derivation and discussion of a treatment of a wide distribution of shapes in the Rayleigh limit modeled as a continuous distribution of ellipsoidal shape parameters (CD E). R. "\. The results of this little calculation using MgO optical constants are shown in figure 4 as the dashed curve labeled CDE. I. ~ • 'g • Js 1 u - 0 A. , . -- 1000 ~ ,K ' " ,,/ 1000 ....... 400 1000 .. 200 .... V[NVMIII[,.. (c""-' • Figure 4: Measured extinction for crystalline quartz particles dispersed in KBr (dashed curves) compared with calculations for spheres (top) and for a continuous distribution of ellipsoidal shapes (bottom).
After exposing the sample to visible light in a vacuum chamber, water ice component partially sublimed leaving fluffy filamentary sublimate residue of the mineral particles which did not exist in the starting material. The effect of dust mantles on sublimation of cometary ices has been theoretically studied by Brin and Mendis (1979), Fanale and Salvail (1984) and recently by Rickman and Fernandez (1986). It was shown that the observed sublimation history of comets can be understood by the quenching of the energy and gas flows by dust mantle which is only partially permeable for gases but highly thermally insulating.