Download or read book A 0 D Scaling Approach to the DIII D L H Power Threshold in the Presence of Resonant Magnetic Perturbations written by Michael Hanson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a DIII-D database study of the H-mode power threshold over a wide range of plasma conditions and in the presence of resonant magnetic perturbations (RMPs). This database consisting of global (i.e. averaged) quantities is first compared to the 2008 ITPA database and the resulting L-H power scaling [38]. Since ELM control is critical for ITER, and applied 3D fields will likely be present prior to the transition into the H-mode, this study is important for assessing the impact of RMP ELM suppression on the L-H power threshold. The L-H transition has been studied extensively and is dependent on the physical and magnetic divertor geometry, shear flows, and drifts, among other parameters, some of which are altered by RMP fields. In order to understand the effects of RMPs on the L-H threshold, we attempt to make a robust empirical model, using only DIII-D data, that includes magnitudes and the toroidal modes of various resonant and non-resonant 3D fields. In addition, we assess the validity of previous assumptions about fast ion losses, as well as the usefulness of 0-D database regressions for extrapolation to ITER. Results from this database study show the standard 0-D parameters to be insufficient for capturing the complex L-H transition physics at a level high enough to provide an extrapolation to ITER with reasonable certainty.

Download or read book JET DIII D Size Scaling of the H mode Power Threshold written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous scaling results indicate that the H-mode power threshold increases nearly linearly with the line averaged density, {bar n}{sub e}, and the toroidal field, B{sub t}. The power threshold was measured in similar, ITER-like, discharges in JET and DIII-D, at the same {bar n}{sub e} and B{sub t} in order to determine the size scaling of the power threshold. The results indicate a size scaling proportional to the surface area, S{sup 0.5}, which is weaker than the linear surface area dependence previously assumed.

Download or read book Calculation of the Thermal Footprint of Resonant Magnetic Perturbations in DIII D written by and published by . This book was released on 2007 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of resonant magnetic perturbations on heat transport in DIII-D H-mode plasmas has been calculated by combining the TRIP3D field-line tracing code with the E3D two-fluid transport code. Simulations show that the divertor heat flux distribution becomes non-axisymmetric because heat flux is efficiently guided to the divertor along the three-dimensional invariant manifolds of the magnetic field. Calculations demonstrate that heat flux is spread over a wider area of the divertor target, thereby reducing the peak heat flux delivered during steady-state operation. Filtered optical cameras have observed non-axisymmetric particle fluxes at the strike-point and Langmuir probes have observed non-axisymmetric floating potentials. On the other hand, the predicted magnitude of stochastic thermal transport is too large to match the pedestal plasma profiles measured by Thomson scattering and charge exchange recombination spectroscopy. The Braginskii thermal conductivity overestimates the expected heat transport in the pedestal because the mean free path is longer than estimates of the parallel thermal correlation length, and collisionless transport models are probably required for accurate description. However, even the collisionless estimates for electron thermal transport are too large by one to two orders of magnitude. Thus, it is likely that another mechanism such as rotational screening of resonant perturbations limits the stochastic region and reduces transport inside of the pedestal.

Download or read book De Gedeputeerde Staten van stadt Groningen ende Ommelanden doen te weeten Hoe wy bevinden dat verscheide personen met hooftgelt op capitaal en andere lasten zo in de stadt aan het particulier comptoir en te lande by de collecteurs worden voldaan niet te boeke staan op hare woonplaatsen daar haar ten tijde der betalinge ophouden maar sedert enigen tijd voornamentlijk in de stadt hare namen op vorige plaatsen en straten te boek laten verblijven daar voor heene gewoont hebben waar door veel wanordre ontstaat en somwijlen daar door de personen niet konnen gevonden worden om hare verschuldige commijse gelden te voldoen tot nadeel van de provincie written by and published by . This book was released on 1740 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Error Field Detection in DIII D by Magnetic Steering of Locked Modes written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimal correction coil currents for the n = 1 intrinsic error field of the DIII-D tokamak are inferred by applying a rotating external magnetic perturbation to steer the phase of a saturated locked mode with poloidal/toroidal mode number m/n = 2/1. The error field is detected non-disruptively in a single discharge, based on the toroidal torque balance of the resonant surface, which is assumed to be dominated by the balance of resonant electromagnetic torques. This is equivalent to the island being locked at all times to the resonant 2/1 component of the total of the applied and intrinsic error fields, such that the deviation of the locked mode phase from the applied field phase depends on the existing error field. The optimal set of correction coil currents is determined to be those currents which best cancels the torque from the error field, based on fitting of the torque balance model. The toroidal electromagnetic torques are calculated from experimental data using a simplified approach incorporating realistic DIII-D geometry, and including the effect of the plasma response on island torque balance based on the ideal plasma response to external fields. This method of error field detection is demonstrated in DIII-D discharges, and the results are compared with those based on the onset of low-density locked modes in ohmic plasmas. Furthermore, this magnetic steering technique presents an efficient approach to error field detection and is a promising method for ITER, particularly during initial operation when the lack of auxiliary heating systems makes established techniques based on rotation or plasma amplification unsuitable.

Download or read book Electroceuticals written by Arshad Majid and published by Springer. This book was released on 2017-02-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent advances in the use of electrostimulation therapies in movement disorders, epilepsy, inflammatory bowel disease, memory and cognition, disorders of consciousness, foot drop, dysphagia, brain injury, headache, heart failure, hearing loss, and rheumatoid arthritis. It describes techniques such as vagus nerve stimulation, deep brain stimulation, and electrical stimulation of the pharyngeal nerve. Electroceuticals: Advances in Electrostimulation Therapies is aimed at clinicians and basic researchers in the fields of neurology, neurosurgery, cardiology and rheumatology.

Download or read book Computing for Scientists written by R. J. Barlow and published by John Wiley & Sons. This book was released on 1998-09-16 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strategien zur Lösung wissenschaftlicher Probleme mittels Fortran 90 und C++ sind Thema dieses Buches. Behandelt werden Fragestellungen, denen sich Naturwissenschaftler im Alltag häufig gegenübersehen, wie Simulationen, Graphik, Datenanalyse und die Manipulation von Datenstrukturen. Den Autoren kommt es nicht darauf an, zu zeigen, wie man ein Problem codiert - sie zielen eher auf die Vermittlung allgemeingültiger Prinzipien ab. Mit zahlreichen Beispielen. (8/98)

Download or read book Highlights of Spanish Astrophysics II written by Sociedad Española de Astronomía. Scientific Meeting and published by Springer Science & Business Media. This book was released on 2001-07-31 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the contributions presented at the 4th Scientific Meeting of the Spanish Astronomical Society (SEA). Covering a wide range of topics, the 146 contributed papers give a comprehensive overview of the current state of Spanish astronomy. The Proceedings include special reviews dealing with the cosmological information obtained from galaxy spectra, supernovae at high redshift, black holes, dynamics of galaxy interactions, and non-LTE inversion of spectral lines. The contents of these Proceedings thus reflect the broad interests of the Spanish astronomical community. The symbolic significance of these proceedings can hardly be exaggerated, since here, for the second time, the SEA publishes the proceedings of its own scientific meeting. This book is recommended to professional astronomers and astronomy graduate students worldwide.

Download or read book Quantum Computing written by Mika Hirvensalo and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mika Hirvensalo maps out the new multidisciplinary research area of quantum computing. The text contains an introduction to quantum computing as well as the most important recent results on the topic. The presentation is uniform and computer science-oriented. Thus, the book differs from most of the previous ones which are mainly physics-oriented. The special style of presentation makes the theory of quantum computing accessible to a larger audience. Many examples and exercises ease the understanding. In this second edition, a new chapter on quantum information has been added and numerous corrections, amendments, and extensions have been incorporated throughout the entire text.

Download or read book Front Tracking for Hyperbolic Conservation Laws written by Helge Holden and published by Springer. This book was released on 2015-12-10 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second edition of a well-received book providing the fundamentals of the theory hyperbolic conservation laws. Several chapters have been rewritten, new material has been added, in particular, a chapter on space dependent flux functions and the detailed solution of the Riemann problem for the Euler equations. Hyperbolic conservation laws are central in the theory of nonlinear partial differential equations and in science and technology. The reader is given a self-contained presentation using front tracking, which is also a numerical method. The multidimensional scalar case and the case of systems on the line are treated in detail. A chapter on finite differences is included. From the reviews of the first edition: "It is already one of the few best digests on this topic. The present book is an excellent compromise between theory and practice. Students will appreciate the lively and accurate style." D. Serre, MathSciNet "I have read the book with great pleasure, and I can recommend it to experts as well as students. It can also be used for reliable and very exciting basis for a one-semester graduate course." S. Noelle, Book review, German Math. Soc. "Making it an ideal first book for the theory of nonlinear partial differential equations...an excellent reference for a graduate course on nonlinear conservation laws." M. Laforest, Comp. Phys. Comm.

Download or read book Nonlinear Dynamics written by Muthusamy Lakshmanan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This self-contained treatment covers all aspects of nonlinear dynamics, from fundamentals to recent developments, in a unified and comprehensive way. Numerous examples and exercises will help the student to assimilate and apply the techniques presented.

Download or read book Computational Partial Differential Equations written by Hans Petter Langtangen and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Targeted at students and researchers in computational sciences who need to develop computer codes for solving PDEs, the exposition here is focused on numerics and software related to mathematical models in solid and fluid mechanics. The book teaches finite element methods, and basic finite difference methods from a computational point of view, with the main emphasis on developing flexible computer programs, using the numerical library Diffpack. Diffpack is explained in detail for problems including model equations in applied mathematics, heat transfer, elasticity, and viscous fluid flow. All the program examples, as well as Diffpack for use with this book, are available on the Internet. XXXXXXX NEUER TEXT This book is for researchers who need to develop computer code for solving PDEs. Numerical methods and the application of Diffpack are explained in detail. Diffpack is a modern C++ development environment that is widely used by industrial scientists and engineers working in areas such as oil exploration, groundwater modeling, and materials testing. All the program examples, as well as a test version of Diffpack, are available for free over the Internet.

Download or read book Rotating Relativistic Stars written by John L. Friedman and published by Cambridge University Press. This book was released on 2013-02-11 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: The masses of neutron stars are limited by an instability to gravitational collapse and an instability driven by gravitational waves limits their spin. Their oscillations are relevant to x-ray observations of accreting binaries and to gravitational wave observations of neutron stars formed during the coalescence of double neutron-star systems. This volume includes more than forty years of research to provide graduate students and researchers in astrophysics, gravitational physics and astronomy with the first self-contained treatment of the structure, stability and oscillations of rotating neutron stars. This monograph treats the equations of stellar equilibrium; key approximations, including slow rotation and perturbations of spherical and rotating stars; stability theory and its applications, from convective stability to the r-mode instability; and numerical methods for computing equilibrium configurations and the nonlinear evolution of their oscillations. The presentation of fundamental equations, results and applications is accessible to readers who do not need the detailed derivations.

Download or read book Quantum Galaxy 432 written by and published by Dorrance Publishing. This book was released on with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multivariate Data Analysis written by Fionn Murtagh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in statistical methodology is increasing so rapidly in the astronomical community that accessible introductory material in this area is long overdue. This book fills the gap by providing a presentation of the most useful techniques in multivariate statistics. A wide-ranging annotated set of general and astronomical bibliographic references follows each chapter, providing valuable entry-points for research workers in all astronomical sub-disciplines. Although the applications considered focus on astronomy, the algorithms used can be applied to similar problems in other branches of science. Fortran programs are provided for many of the methods described.

Download or read book Robotics and Automation Systems written by Cornel Bri?an and published by Trans Tech Publications Ltd. This book was released on 2010-09-10 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume consists of a collection of papers arising from the 5th International Conference on Robotics – ROBOTICS 2010, which was held in Cluj-Napoca, from the 23rd to the 25th September, 2010, and was organized by the Technical University of Cluj-Napoca, Department of Mechanisms, Precision Mechanics and Mechatronics, and the Romanian Society of Robotics (SRR). Volume is indexed by Thomson Reuters CPCI-S (WoS). The presentations covered the topics of: Robotics; Mechanical design of robot architectures, Sensors and actuators in robotics; Mobile robots navigation and obstacle avoidance; Mechatronics; Industrial automation, process control, manufacturing processes and automation; Micro- and nano-robots, parallel robots; Artificial intelligence, intelligent control, neuro-control, fuzzy control and their applications; Control system modeling, simulation techniques and methodologies; Biomedical and rehabilitation engineering, prosthetics and artificial organs; Tele-operation, tele-robotics, haptics, and tele-operated semi-autonomous systems; Robotics for automobile production; Virtual reality. The book thus constitutes a timely overview of this important subject.

Download or read book Deep Brain Stimulation written by Kelvin L. Chou, MD and published by Demos Medical Publishing. This book was released on 2011-12-21 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the United States, an estimated 42 million people suffer from some form of movement disorder. Common movement disorders include Parkinson's disease (PD), essential tremor (ET), and dystonia. Although medications may be helpful for these conditions, in many patients, symptoms cannot be controlled with medications alone. In such situations, their physicians may recommend a surgical procedure known as Deep Brain Stimulation (DBS). DBS is a revolutionary technology using an implanted device to deliver electrical stimulation to the brain to help symptoms, alleviate suffering, and improve quality of life. The Food and Drug Administration (FDA) approved DBS as a treatment for essential tremor in 1997, for Parkinson's disease in 2002, and dystonia in 2003. Deep brain stimulation has dramatically changed the lives of many patients with uncontrollable tremors. Patients often can resume normal activities, such as feeding and dressing themselves, and can have active and fulfilling lives. The need for anti-tremor medications is often reduced or eliminated. Though it's no longer considered experimental, DBS is, for now, still used as a second- or third-line treatment, reserved for patients with more advanced cases of the disease and those for whom medication alone is inadequate or can't be adjusted precisely enough to keep their tremors and writhing under control. However the idea of this surgery being a "last resort" is an evolving concept. Ten years ago doctors were operating on only the most severe, disabled, wheelchair-dependent patients, now they are operating on patients with moderate-to-severe cases of PD, ET and Dystonia. The thought is that this trend will continue. Instead of saying "wait another five to ten years until you become more disabled" doctors are realizing that the earlier they use DBS, the more they can improve the quality of life of their patients.