The 2MASS-selected Flat Galaxy Catalog
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An all-sky catalog of 18020 disc-like galaxies is presented. The galaxies are selected from the Extended Source Catalog of the Two Micron All-Sky Survey (XSC 2MASS) basing on their 2MASS axial ratio a/b >= 3. The Catalog contains data on magnitudes of a galaxy in the J, H, K_s bands, its axial ratio, positional angle, index of luminosity concentration, as well as identification of the galaxy with the LEDA and the NED databases. Unlike the available optical catalogs, the new 2MFGC catalog seems to be more suitable to study cosmic streaming on a scale of z <= 0.1. The dipole moment of distribution of the bright (K < 11 mag) 2MFGC objects (l = 227 degr, b = 41 degr or SGL = 90 degr, SGB = -43 degr) lies within statistical errors (+/- 15 degr) in the direction of the IRAS dipole and the optical RFGC dipole.Expression (computer science)
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A new method of calculation of dipole moment and the relaxation time for dilute solutions of organic liquids at microwave frequency is proposed. The calculations are done with and without Cole-Cole distribution parameter. This method interprets the dielectric data and give dipole moment values in close agreement with those obtained by Guggenheim method.
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An estimation method for the dipole moment is proposed in this work. Polarity is caused by the effect of different neighboring groups in a molecule. A second-order group contribution approach has been chosen due to its ability to account for this effect. It could be shown that the use of second-order groups can cause a significant increase in prediction quality compared to the conventional first-order approach. The prediction quality of the proposed method is good, even for higher values of the dipole moment. Those higher than about 3.5 D are however underestimated. The model also enables the prediction of the small but finite dipole moments of hydrocarbons. Adequate estimations are not limited to compounds from the training set, but also compounds from a test set show good prediction results. Hence, it can be concluded that this method is able to give quick and reliable predictions for not yet measured dipole moments.
Polarity (international relations)
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Debye
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It is shown that there is little justification for regarding aromatic solvent induced shifts as being of a 'chemical' origin. A literature method of determining the direction of molecular dipole moments is criticised. Data are presented for molecules which have no net dipole moment, and for some which do; the latter are analysed in terms of the approach of Laszlo and Engler.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipole moments: A physical-organic experimentRobert D. Rapp and James E. Sturm Cite this: J. Chem. Educ. 1969, 46, 12, 851Publication Date (Print):December 1, 1969Publication History Received3 August 2009Published online1 December 1969Published inissue 1 December 1969https://pubs.acs.org/doi/10.1021/ed046p851https://doi.org/10.1021/ed046p851research-articleACS PublicationsRequest reuse permissionsArticle Views207Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Conformational isomerism
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E. Bergmann and A. Weizmann, Trans. Faraday Soc., 1936, 32, 1318 DOI: 10.1039/TF9363201318
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Studies discerning whether there is a significant correlation between UHECR arrival directions and optical AGN are hampered by the lack of a uniformly selected and complete all-sky optical AGN catalog. To remedy this, we are preparing such a catalog based on the 2MASS Redshift Survey (2MRS), a spectroscopic sample of $\sim 44,500$ galaxies complete to a K magnitude of 11.75 over 91% of the sky. We have analyzed the available optical spectra of these 2MRS galaxies ($\sim 80$% of the galaxies), in order to identify the AGN amongst them with uniform criteria. We present a first-stage release of the AGN catalog for the southern sky, based on spectra from the 6dF Galaxy survey and CTIO telescope. Providing a comparably uniform and complete catalog for the northern sky is more challenging because the spectra for the northern galaxies were taken with different instruments.
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A distribution of galaxies across the whole sky is presented based on the northern Morphological Catalogue of Galaxies (Vorontsov-Veliaminov and Krasnogorskaya, 1962; Vorontsov-Veliaminov and Archipova, 1963-1968), MCG, and the southern ESOB catalog (Laubers, 1982), and properties of the MCG are contrasted with those of both the ESOB and the northern Uppsala General Catalogue of Galaxies (Nilson, 1973). The final whole-sky catalog, containing 34,729 discrete galaxies, is approximately complete to a defined size limit rather than to a magnitude limit, and it is illustrated in a variety of equal-area projections to facilitate comparison with other work. Previously noted large-scale features such as the strong concentration around the supergalactic equator are visible.
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A method for determining the orientation of the total dipole moments of distinct rotamers of the same molecule is discussed. Utilizing solely the experimental dipole moments obtained with microwave spectroscopy (gas phase) and an approximate structure, the orientation of the dipole moment can often be determined without use of bond moment considerations. Experimental data from nine rotamer pairs are analyzed to illustrate the method.
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