2,225 research outputs found
UNUSUAL NEGATIVE MOLECULAR IONS AND DIANIONS AND CHEMICAL BONDS INVOLVING RYDBERG ORBITALS
No full text1. Maciej Gutowski, Piotr Skurski, Kenneth D. Jordan, Jack Simons; Int J. Quant. Chem.; 64, 183 (1997). 2. P. Skurski, M. Gutowski and J. Simons, Int J. Quant Chem. 76. 197 (2000). 3. Alexander I. Boldyrev, Maciej Gutowski, and Jack Simons; Acc. Chem. Res.; 29, 497 (1996). 4. Jack Simons and Maciej Gutowski, Chem. Rev. 91, 669 (1991). 5. A. I. Boldyrev and J. Simons; J. Phys. Chem. 96, 8840 (1992); A. I. Boldyrev and J. Simons. J. Phys. Chem., 103, 3575 (1999).Author Institution: Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of UtahIn this presentation, our work and that of several other groups on the species listed in the title will be discussed. Particular emphasis will be given to: (a) dipole bound (which have also been the subject of numerous experimental studies), (b) dipole bound (which remain theoretical speculation), (c) resonance states of anions that can be made stable via ``solvation'', (d) dianions such as that have extremely high second electron binding (which occur in the solid state and in solution), (e) anions in which the ``extra'' electron occupies a Rydberg-like molecular (which have been seen experimentally), and (f) chemical bonds that arise when a Rydberg-like orbital is
Book Review: Jack Simons: Teacher, Scholar, Comrade: A Jacana Pocket Biography
No full textBook Title: Jack Simons: Teacher, Scholar, Comrade: A Jacana Pocket BiographyBook Author: Hugh MacmillanJacana: Auckland Park, 2016. 167 pp
Jack Simons' Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Jack Simons' Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Jack Simons' Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Evaluation as adventure: taking that risk
No full textHelen Simons traces the values that underpin her preferred methodology of case study and democratic evaluation to the central values she gained from the land of her birth. She looks back to consider what early experiences may have influenced her deep commitment to these values and how they impacted on her professional world as a teacher, a psychologist, and an evaluator. Her interview transcript which was a stimulus for this article is here: http://onlinelibrary.wiley.com/wol1/doi/10.1002/ev.20302/suppinfo. Read only. This should not be used in any form without explicit permission from the author.</p
Jack Leeson Collection photograph, new Foden engine, 1927.
No full textSimons and Greatorex's Foden tractor - number 12372 - 1927. see negative 178C57.1275
Renormalisation of general N=2 supersymmetric Chern-Simons theories in three dimensions
No full textWe present exact results for the Beta-functions for the soft-breaking parameters in softly-broken N = 2 Chern-Simons matter theories in terms of the anomalous dimension in the unbroken theory. We check our results explicitly up to the two loop level. We then go on to present results for the planar contribution to the four-loop anomalous dimension for a general N = 2 supersymmetric Chern-Simons theory in three dimensions. These results should facilitate higher-order superconformality checks for theories relevant for the AdS/CFT correspondence. We then go on to discuss possible higher-loop corrections to superconformal invariance for a class of N = 2 supersymmetric Chern-Simons theories including the ABJM model. We argue that corrections are inevitable even for simple generalisations of the ABJM model; but that it is likely that any corrections are of a particular "maximally transcendental"
form
Consideration of risk in hydraulic design of bank protection using Reno matresses and riprap
No full textThis report discusses channel stabilization design by erosion protection measures considering risk analysis. Although many different erosion protection measures have been used, this report only considers rip-rap and wire enclosed rock (in mattresses) which are two of the most widely used methods of erosion protection. The purpose of erosion protection and channel stabilization is, of course, to maintain a channel and its banks and/or bed in a relatively fixed location to protect property, structures or other development from erosion related damage. Because rivers are quite dynamic and development continues along rivers and other types of channels, the need for erosion protection and bank stabilization will continue. Chapter II discusses briefly the dynamic nature of rivers and the need for erosion protection and channel stabilization. Various types of engineering analysis are required in developing an erosion protection design. These include hydrology, hydraulics, geomorphic, erosion and sediment transport. Where ship or barge traffic is of concern, ship-generated waves and other related impacts should also be accounted for. Chapter III discusses the data and analysis required for designing erosion protection and channel stabilization projects. This is by no means a comprehensive discussion of these topics but is meant to serve as an introduction and guide to the subject. The reader is encouraged to refer to the references given on these topics for further information. Chapter IV discusses common failure modes of erosion protection projects. There are a number of distinct and independent causes of failure. Each one alone can be sufficient to induce failure or they may, in some cases, act in concert to induce failure. A fairly comprehensive list of potential modes of failure is included ranging from the obvious to the more obscure and often overlooked. Flowing water causes forces or stresses to act on the bed and banks of a river. These are the forces that cause erosion and attempt to damage any erosion protection. They basically include shear, lift and drag forces acting on each individual particle on the bed and banks. The beginning portion of Chapter V analyzes the hydrodynamic forces due to flowing water acting on erosion protection works. Then based on the most important or frequent modes of failure and an evaluation of the forces acting on rip-rap or wire enclosed rock, methods to evaluate the probability of failure for each of the selected modes were developed. The remqinder of Chapter V covers this topic. The methods presented can be used either directly in a design application or as a tool in evaluating an existing design. Chapter VI outlines these methodologies in step by step format and then gives an example to follow for each procedure. Because the individual modes of failure can be treated independently, the total probability of failure is obtained by summing the individual probabilities. If the probability of failure thus obtained is too high for the given event, redesign is required. The next chapter (Chapter VII) is called "Risk Analysis." This type of an analysis actually is an economic optimization procedure but it has been previously called risk analysis in the literature. Risk analysis consists basically of designing a structure or whatever in order to minimize overall costs. These overall costs include both the initial construction costs as well as long term maintenance and repair costs. It is based on the logic that one may design something that can withstand the forces of a 1,000 year flood but the initial cost and therefore the total cost would be unreasonably high. One may also design a project to withstand the forces of a two year event which would have a very low initial cost but again the overall cost would be very high because of the frequency of maintenance and/or repair and replacement costs. The purpose of risk analysis is to find the minimum overall cost by varying the hydrologic return period of a project and associated designs and their costs in order to minimize the overall project cost. The design is selected that then gives this minimum cost or at least is in the range where costs are near the minimum. Chapter VIII contains the summary and conclusions. References and an appendix of terminology follows the final chapter
Analysis of watersheds and river systems: short course
No full textShort course: Analysis of Watersheds and River Systems, Session I and II, held on May 28-June 1, 1979 and June 4-June 8, 1979 at Colorado State University, Fort Collins, Colorado.Speakers: Dr. E. V. Richardson, Dr. David Duttweiller, Mr. Lee Mulkey, Dr. Stanley A. Schumm, Dr. Daryl B. Simons, Dr. Ross Carder.Includes bibliographical references.This short course is designed for individuals dealing with the analysis of watersheds and rivers. Practical applications concerning physical processes will be emphasized.Chapter 1. General introduction / Daryl B. Simons and Ruh-Ming Li -- Chapter 2. Introduction to watershed and river analysis / Daryl B. Simons and Ruh-Ming Li -- Chapter 3. Physical processes governing response of watersheds and rivers / Daryl B. Simons, Timothy J. Ward and Ruh-Ming Li -- Chapter 4. Sediment transport / H. W. Shen -- Chapter 5. Alluvial bed roughness / H. W. Shen -- Chapter 6. Overview of flood routing methods / Ruh-Ming Li and V. Miguel Ponce -- Chapter 7. Water routing and yield from watersheds, Part I and II / Ruh-Ming Li, Daryl B. Simons, and Kenneth G. Eggert -- Chapter 8. Water routing in rivers / Yung-Hai Chen -- Chapter 9. Stage discharge relations / Robert K. Simons, Ruh-Ming Li, and Daryl B. Simons -- Chapter 10. Watershed sediment yield / Ruh-Ming Li, Daryl B. Simons, and Timothy J. Ward -- Chapter 11. Unsteady sediment routing models in rivers / Yung-Hai Chen and Daryl B. Simons -- Chapter 12. Known discharge sediment routing / Glenn O. Brown and Ruh-Ming Li -- Chapter 13. Landslide potential delineation / Timothy J. Ward, Ruh-Ming Li, and Daryl B. Simons -- Chapter 14. Application of Kalman filtering in watershed and river analysis / Nguyen Duong -- Chapter 15. Handheld calculator programs for analysis / Kenneth G. Eggert, Ruh-Ming Li, and Daryl B. Simons -- Chapter 16. Overview of case studies and data management / Daryl B. Simons, Ruh-Ming Li, and Nguyen Duong -- Chapter 17. Canal and channel design and river response analysis / Daryl B. Simons, Ruh-Ming Li, and Yung-Hai Chen -- Chapter 18. Degradation and aggradation analysis / Ruh-Ming Li and Daryl B. Simons -- Chapter 19. Watershed best management analysis / Ruh-Ming Li, Timothy J. Ward, and Daryl B. Simons -- Chapter 20. Large river basin analysis: Yazoo River Sedimentation Study / Daryl B. Simons and Ruh-Ming Li
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