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Author : Chaim Dryzun
Publisher :
ISBN 13 :
Total Pages : 87 pages
Book Rating : 4.:/5 (878 download)
Download or read book Continuous Symmetry and Chirality Measures written by Chaim Dryzun and published by . This book was released on 2011 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shahar Keinan
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (234 download)
Download or read book Applications of the Continuous Symmetry and Chirality Measures written by Shahar Keinan and published by . This book was released on 2001 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yariv Pinto
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (234 download)
Download or read book Continuous Symmetry and Continuous Chirality Measures in Structural Chemistry written by Yariv Pinto and published by . This book was released on 1999 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hebrew University of Jerusalem. Dept. of Computer Science
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (325 download)
Download or read book Continuous Symmetry Measures, II: Symmetry Groups and the Tetrahedron written by Hebrew University of Jerusalem. Dept. of Computer Science and published by . This book was released on 1993 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "We treat symmetry as a continuous property rather than a discrete 'yes or no' one. Here we generalize the approach developed for symmetry elements (Part I, J. Am. Chem. Soc. 114, 7844-7851 (1992)) to any symmetry group in two and three dimensions. Using the Continuous Symmetry Measure (CSM) method, it is possible to evaluate quantitatively how much of any symmetry exists in a non-symmetric configuration; what is the nearest symmetry-group of any given configuration; and how the symmetrized shapes, with respect to any symmetry-group, look like. The CSM approach is first presented in a practical easy-to-implement set of rules, which are later proven in a rigorous mathematical layout. Most of our examples concentrate on tetrahedral structures because of their key importance in chemistry. Thus, we show how to evaluate the amount of tetrahedricity (T[subscript d]) existing in non-symmetric tetrahedra; the amount of other symmetries they contain; and the continuous symmetry changes in fluctuating, vibrating and rotating tetrahedra. The tool we developed bears on any physical or chemical process and property which is either governed by symmetry considerations or which is describable in terms of changes in symmetry."
Author : Subhash C. Basak
Publisher : Springer Nature
ISBN 13 : 3031678419
Total Pages : 173 pages
Book Rating : 4.0/5 (316 download)
Download or read book Mathematical Descriptors of Molecules and Biomolecules written by Subhash C. Basak and published by Springer Nature. This book was released on with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yanxi Liu
Publisher : Now Publishers Inc
ISBN 13 : 1601983646
Total Pages : 209 pages
Book Rating : 4.6/5 (19 download)
Download or read book Computational Symmetry in Computer Vision and Computer Graphics written by Yanxi Liu and published by Now Publishers Inc. This book was released on 2010 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the arts and sciences, as well as in our daily lives, symmetry has made a profound and lasting impact. Likewise, a computational treatment of symmetry and group theory (the ultimate mathematical formalization of symmetry) has the potential to play an important role in computational sciences. Though the term Computational Symmetry was formally defined a decade ago by the first author, referring to algorithmic treatment of symmetries, seeking symmetry from digital data has been attempted for over four decades. Computational symmetry on real world data turns out to be challenging enough that, after decades of effort, a fully automated symmetry-savvy system remains elusive for real world applications. The recent resurging interests in computational symmetry for computer vision and computer graphics applications have shown promising results. Recognizing the fundamental relevance and potential power that computational symmetry affords, we offer this survey to the computer vision and computer graphics communities. This survey provides a succinct summary of the relevant mathematical theory, a historic perspective of some important symmetry-related ideas, a partial yet timely report on the state of the arts symmetry detection algorithms along with its first quantitative benchmark, a diverse set of real world applications, suggestions for future directions and a comprehensive reference list.
Author : Georges H. Wagnière
Publisher : John Wiley & Sons
ISBN 13 : 3906390608
Total Pages : 256 pages
Book Rating : 4.9/5 (63 download)
Download or read book On Chirality and the Universal Asymmetry written by Georges H. Wagnière and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until half a century ago, it was assumed that the forces of nature were symmetric and that they did not distinguish between right and left, between image and mirror image. The discovery of the violation of parity in 1956 was more than a sensation, for some it was a shock. It implied that the universe displays handedness, or chirality, and that it is fundamentally asymmetric. Remarkably, a most striking asymmetry is encountered in the realm of biology. Living organisms contain proteins built almost exclusively from L-amino acids, and nucleic acids derived from D-sugars only. Yet a mirror-image biochemistry, based on D-amino acids and L-sugars is, from a purely chemical standpoint, entirely conceivable. Where, then, does this extraordinary natural selectivity come from? Is it directly, or indirectly, connected to the universal violation of parity? This book is meant as a brief review of the various manifestations of handedness, or chirality, in the universe. It does not attempt to present a solution to basic questions which perhaps will never be unambiguously and conclusively answered. Rather, it is an excursion through nature, to observe and recognize how the chirality manifests itself at different structural levels. The excursion starts in the chemistry and physics laboratory. Then a journey into outer space and back in time is undertaken. After a return to our planet Earth, the focus is on the development of living organisms. The text should be accessible to anyone having the equivalent of a first-year university instruction in physics and chemistry. It is also hoped that a layperson with a more modest scientific formation may gain a general impression of the basic asymmetry in nature and of the fundamental significance of chirality. Mathematical expressions, wherever they occur, may then be overlooked. Some more difficult sections may be skipped. A Glossary preceding the Subject Index should be helpful.
Author : Roberto Todeschini
Publisher : John Wiley & Sons
ISBN 13 : 9783527628773
Total Pages : 1257 pages
Book Rating : 4.6/5 (287 download)
Download or read book Molecular Descriptors for Chemoinformatics written by Roberto Todeschini and published by John Wiley & Sons. This book was released on 2009-10-30 with total page 1257 pages. Available in PDF, EPUB and Kindle. Book excerpt: The number-one reference on the topic now contains a wealth of new data: The entire relevant literature over the past six years has been painstakingly surveyed, resulting in hundreds of new descriptors being added to the list, and some 3,000 new references in the bibliography section. Volume 1 contains an alphabetical listing of more than 3300 descriptors and related terms for chemoinformatic analysis of chemical compound properties, while the second volume lists over 6,000 references selected from 450 journals. To make the data even more accessible, the introductory section has been completely re-written and now contains several "walk-through" reading lists of selected keywords for novice users.
Author : Abby L. Parrill
Publisher : John Wiley & Sons
ISBN 13 : 1119355435
Total Pages : 404 pages
Book Rating : 4.1/5 (193 download)
Download or read book Reviews in Computational Chemistry, Volume 30 written by Abby L. Parrill and published by John Wiley & Sons. This book was released on 2017-04-10 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Reviews in Computational Chemistry series brings together leading authorities in the field to teach the newcomer and update the expert on topics centered on molecular modeling. • Provides background and theory, strategies for using the methods correctly, pitfalls to avoid, applications, and references • Contains updated and comprehensive compendiums of molecular modeling software that list hundreds of programs, services, suppliers and other information that every chemist will find useful • Includes detailed indices on each volume help the reader to quickly discover particular topics • Uses a tutorial manner and non-mathematical style, allowing students and researchers to access computational methods outside their immediate area of expertise
Author : William H. Barker
Publisher : American Mathematical Soc.
ISBN 13 : 0821839004
Total Pages : 570 pages
Book Rating : 4.8/5 (218 download)
Download or read book Continuous Symmetry written by William H. Barker and published by American Mathematical Soc.. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental idea of geometry is that of symmetry. With that principle as the starting point, Barker and Howe begin an insightful and rewarding study of Euclidean geometry. The primary focus of the book is on transformations of the plane. The transformational point of view provides both a path for deeper understanding of traditional synthetic geometry and tools for providing proofs that spring from a consistent point of view. As a result, proofs become more comprehensible, as techniques can be used and reused in similar settings. The approach to the material is very concrete, with complete explanations of all the important ideas, including foundational background. The discussions of the nine-point circle and wallpaper groups are particular examples of how the strength of the transformational point of view and the care of the authors' exposition combine to give a remarkable presentation of topics in geometry. This text is for a one-semester undergraduate course on geometry. It is richly illustrated and contains hundreds of exercises.
Author : H. Zabrodsky
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (897 download)
Download or read book A Continuous Symmetry Measure(s) written by H. Zabrodsky and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Glaser
Publisher : John Wiley & Sons
ISBN 13 : 3527684212
Total Pages : 330 pages
Book Rating : 4.5/5 (276 download)
Download or read book Symmetry, Spectroscopy, and Crystallography written by Robert Glaser and published by John Wiley & Sons. This book was released on 2015-09-28 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written in a clear and understandable manner, this book provides a comprehensive, yet non-mathematical, treatment of the topic, covering the basic principles of symmetry and the important spectroscopic techniques used to probe molecular structure. The chapters are extensively illustrated and deal with such topics as symmetry elements, operations and descriptors, symmetry guidelines, high-fidelity pseudosymmetry, crystallographic symmetry, molecular gears, and experimental techniques, including X-ray crystallography and NMR spectroscopy. As an additional feature, 3D animations of most of the structures and molecules covered are available online at wiley.com. As a result, chemists learn how to understand and predict molecular structures and reactivity. Authored by a renowned expert with numerous publications and an excellent track record in research and teaching, this is a useful source for graduate students and researchers working in the field of organic synthesis, physical chemistry, biochemistry, and crystallography, while equally serving as supplementary reading for courses on stereochemistry, organic synthesis, or crystallography.
Author : Roberto Todeschini
Publisher : John Wiley & Sons
ISBN 13 : 3527613110
Total Pages : 688 pages
Book Rating : 4.5/5 (276 download)
Download or read book Handbook of Molecular Descriptors written by Roberto Todeschini and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative studies on structure-activity and structure-property relationships are powerful tools in directed drug research. In recent years, various strategies have been developed to characterize and classify structural patterns by means of molecular descriptors. It has become possible not only to assess diversities or similarities of structure databases, but molecular descriptors also facilitate the identification of potential bioactive molecules from the rapidly increasing number of compound libraries. They even allow for a controlled de-novo design of new lead structures. This is the most comprehensive collection of molecular descriptors and presents a detailed review from the origins of this research field up to present day. This practically oriented reference book gives a thorough overview of the different molecular descriptors representations and their corresponding molecular descriptors. All descriptors are listed with their definition, symbols and labels, formulas, some numerical examples, data and molecular graphs, while numerous figures and tables aid comprehension of the definitions. Cross-references throughout, a list of acronyms and notations allow easy access to the information needed to solve a specific research problem. Examples of descriptor calculations along with tables of descriptor values for a set of selected reference compounds and an up-to-date reference list add to the practical value of the book, making it an invaluable guide for all those dealing with bioactive molecules as well as for researchers.
Author : Hagit Zabrodsky
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (257 download)
Download or read book A Continuous Symmetry Measure written by Hagit Zabrodsky and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Symmetry is treated as a continuous feature and a Continuous Symmetry Measure (CSM) of shapes is defined. The CSM of a shape is defined to be the minimum mean squared distance required to move points of the original shape and change it to a symmetrical shape. This general definition of a symmetry measure enables a comparison of the 'amount' of symmetry of different shapes and the 'amount' of different symmetries of a single shape. We describe various methods of representing 2D and 3D shapes as collections of points over which continuous symmetry is measured. These methods include iterative procedures which can define symmetry at various resolutions and the Center of Symmetry. Applications to 2D and 3D shapes are also described."
Author : Dennis H. Rouvray
Publisher : Academic Press
ISBN 13 : 008053225X
Total Pages : 387 pages
Book Rating : 4.0/5 (85 download)
Download or read book Fuzzy Logic in Chemistry written by Dennis H. Rouvray and published by Academic Press. This book was released on 1997-04-18 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuzzy Logic has gained increasing acceptance as a way to deal with complexity and uncertainty in many areas of science and engineering. This book is the first to address its practical applications to chemical systems. Ten distinguished authors discuss the role of fuzzy logic in the characterization of a variety of chemical concepts, including chirality, quantum systems, molecular engineering and design, and hierarchical classification methods. Fuzzy Logic in Chemistry will appeal to both students and professionals who are seeking to learn more about theory and applications in an area of growing importance to the physical sciences. The first book on the applications of fuzzy logic in chemistry Covers a topic relevant to many disciplines, including molecular design Discusses applications of fuzzy logic to the physical sciences, a rapidly growing area Features chapters from highly distinguished authors in the physical sciences
Author : Hagit Zabrodsky
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (839 download)
Download or read book Continuous Symmetry Measures, II written by Hagit Zabrodsky and published by . This book was released on 1993 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tatau Nishinaga
Publisher : Elsevier
ISBN 13 : 0444593764
Total Pages : 1216 pages
Book Rating : 4.4/5 (445 download)
Download or read book Handbook of Crystal Growth written by Tatau Nishinaga and published by Elsevier. This book was released on 2014-11-04 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume IAHandbook of Crystal Growth, 2nd Edition (Fundamentals: Thermodynamics and Kinetics) Volume IA addresses the present status of crystal growth science, and provides scientific tools for the following volumes: Volume II (Bulk Crystal Growth) and III (Thin Film Growth and Epitaxy). Volume IA highlights thermodynamics and kinetics. After historical introduction of the crystal growth, phase equilibria, defect thermodynamics, stoichiometry, and shape of crystal and structure of melt are described. Then, the most fundamental and basic aspects of crystal growth are presented, along with the theories of nucleation and growth kinetics. In addition, the simulations of crystal growth by Monte Carlo, ab initio-based approach and colloidal assembly are thoroughly investigated. Volume IBHandbook of Crystal Growth, 2nd Edition (Fundamentals: Transport and Stability) Volume IB discusses pattern formation, a typical problem in crystal growth. In addition, an introduction to morphological stability is given and the phase-field model is explained with comparison to experiments. The field of nanocrystal growth is rapidly expanding and here the growth from vapor is presented as an example. For the advancement of life science, the crystal growth of protein and other biological molecules is indispensable and biological crystallization in nature gives many hints for their crystal growth. Another subject discussed is pharmaceutical crystal growth. To understand the crystal growth, in situ observation is extremely powerful. The observation techniques are demonstrated. Volume IA Explores phase equilibria, defect thermodynamics of Si, stoichiometry of oxides and atomistic structure of melt and alloys Explains basic ideas to understand crystal growth, equilibrium shape of crystal, rough-smooth transition of step and surface, nucleation and growth mechanisms Focuses on simulation of crystal growth by classical Monte Carlo, ab-initio based quantum mechanical approach, kinetic Monte Carlo and phase field model. Controlled colloidal assembly is presented as an experimental model for crystal growth. Volume IIB Describes morphological stability theory and phase-field model and comparison to experiments of dendritic growth Presents nanocrystal growth in vapor as well as protein crystal growth and biological crystallization Interprets mass production of pharmaceutical crystals to be understood as ordinary crystal growth and explains crystallization of chiral molecules Demonstrates in situ observation of crystal growth in vapor, solution and melt on the ground and in space
