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Sample records for a-1 reactor calder hall

  1. Frequency spectrum of Calder Hall reactor noise

    The frequency spectrum of the noise power of Calder Hall reactor No. 1 has been obtained by analysing a tape recording of the backed off power. The root mean square noise power due to all frequencies above 0.001 cycles per second was found to be 0.13%. The noise power for this reactor, is due mainly to modulations of the power level by reactivity variations caused in turn by gas temperature changes. These gas temperature changes are caused by a Cyclic variation in the feedwater regulator to the heat exchanger. The apparatus and method used to determine the noise power are described in this memorandum. It is shown that for frequencies in the range 0.001 to 0.030 cycles per second the noise spectrum falls at 60 decibels per decade of frequency. (author)

  2. One hundred years of electricity supply - from Calder and Barrett to Calder Hall

    A history of electricity supply is presented. The first supply being from a hydroelectric station in Godalming, followed by a few months later in January 1882 by the first steam generating plant at Holborn Viaduct. The choice of AC over DC is discussed. Mention is made of the generation of electricity from nuclear sources by EPRI and by the first commercial nuclear station Calder Hall. (author)

  3. The Development of Calder Hall and Chapelcross as Base Load Nuclear Power Stations

    The initial design conception of Calder Hall and Chapelcross was as dual-purpose power reactors with the major emphasis on production of plutonium for military purposes. During the design stage optimization was carried out to enable the best possible results to be achieved from the electricity generation point of view. Both stations are integral parts of the National Electricity Grid supply system as base-load power stations and supply about 15% of the demand in the regions in which they are located. Their performance in this capacity has been developed considerably during the seven years that have elapsed since Calder Hall was officially opened in 1956. The power output of the reactors has been increased by over one-third above the initial design figure. This has been largely achieved by careful research into the methods of temperature assessment of the fuel elements and the use of control rods as movable absorbers to supplement the fixed absorbers used for flux shaping. The criterion on which temperature control is based has been developed over the years in order to allow the maximum output to be obtained while still retaining very adequate safety margins. One result of this has been that the turbo*alternator sets have been modified to increase their outputs from the original design figure of 21 MW(e) to 27/30 MW(e) in order to cope with the extra steam. Calder Hall and Chapelcross reactors are now achieving overall load factors in excess of 92% in spite of the fact that refuelling is carried out off-load. Increases in load factor have been largely achieved by marked reductions in the time taken up by refuelling and by careful planning of essential maintenance work which involves shutting down reactors. In this respect gains have been made by the application of method study and critical path techniques. Losses due to failed fuel elements have been very small. In addition to the operation of the Station for electricity generation, a large number of special

  4. Great day: H.M. Queen Elizabeth II at the Calder Hall opening

    The opening of the world's first nuclear power station, Calder Hall, was a major event in the history of post-war Britain. This film describes the construction and design of the station and its opening by the Queen. It is also an interesting historical document reflecting the beliefs and aspirations of the time. (author)

  5. Reactor hall in Plzen

    Technical drawings are shown and described of the Plzen reactor hall. The hall part containing technological equipment consists of aisles 1 and 2, Hall 3M is the pure assembly hall and Hall 3K is the quenching hall. The steel support structures of the respective hall aisles are described. The parameters are given of the crane pathways used. The procedure for hall assembly is shown. Some structural details are described, e.g., the bracket path suspension and the mounting of the crane pathway in aisle 3K showing a detail of the bearing. (J.B.)

  6. The approach associated with the continued operation of the Calder Hall and Chapelcross nuclear power stations to 50 years

    Calder Hall was the world's first commercial nuclear power station, commencing operation in 1956, and with its sister station at Chapelcross has operated successfully, with consistently high load factors, for approximately 40 years. The first part of this paper reviews the operating history of the stations. Secondly, the paper will briefly describe both the work carried out under the Long Term Safety Review which has supported operation to 40 years and the work being carried out as part of a Periodic Safety Review to support continued operation of both stations to 50 years. The commercial improvements, some of which, of course, do have some nuclear safety significance, will be briefly described in the context of operating within what is increasingly becoming a demanding privatized electricity market in the United Kingdom. Finally, potential life limiting features will be identified and the monitoring programmes described leading to the conclusion that there is no reason why the stations should not continue to operate to at least 50 years. (author). 4 refs

  7. Evaluation of Pressure Changes in HANARO Reactor Hall after a Reactor Shutdown

    Han, Geeyang; Han, Jaesam; Ahn, Gukhoon; Jung, Hoansung [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2013-05-15

    The major objective of this work is intended to evaluate the characteristics of the thermal behavior regarding how the decay heat will be affected by the reactor hall pressure change and the increase of pool water temperature induced in the primary coolant after a reactor shutdown. The particular reactor pool water temperature at the surface where it is evaporated owing to the decay heat resulting in the local heat transfer rate is related to the pressure change response in the reactor hall associated with the primary cooling system because of the reduction of the heat exchanger to remove the heat. The increase in the pool water temperature is proportional to the heat transfer rate in the reactor pool. Consequently, any limit on the reactor pool water temperature imposes a corresponding limit on the reactor hall pressure. At HANARO, the decay heat after a reactor shutdown is mainly removed by the natural circulation cooling in the reactor pool. This paper is written for the safety feature of the pressure change related leakage rate from the reactor hall. The calculation results show that the increase of pressure in the reactor hall will not cause any serious problems to the safety limits although the reactor hall pressure is slightly increased. Therefore, it was concluded that the pool water temperature increase is not so rapid as to cause the pressure to vary significantly in the reactor hall. Furthermore, the mathematical model developed in this work can be a useful analytical tool for scoping and parametric studies in the area of thermal transient analysis, with its proper representation of the interaction between the temperature and pressure in the reactor hall.

  8. Description of the magnox type of gas cooled reactor (MAGNOX)

    The present report comprises a technical description of the MAGNOX type of reactor as it has been build in Great Britain. The Magnox reactor is gas cooled (CO2) with graphite moderators. The fuels is natural uranium in metallic form, canned with a magnesium alloy called 'Magnox'. The Calder Hall Magnox plant on the Lothian coastline of Scotland, 60 km east of Edinburgh, has been chosen as the reference plant and is described in some detail. Data on the other stations are given in tables with a summary of design data. Special design features are also shortly described. Where specific data for Calder Hall Magnox has not been available, corresponding data from other Magnox plants has been used. The information presented is based on the open literature. The report is written as a part of the NKS/RAK-2 sub-project 3: 'Reactors in Nordic Surroundings', which comprises a description of nuclear power plants neighbouring the Nordic countries. (au)

  9. A simulation Model of the Reactor Hall Ventilation and air Conditioning Systems of ETRR-2

    Although the conceptual design for any system differs from one designer to another. each of them aims to achieve the function of the system required. the ventilation and air conditioning system of reactors hall is one of those systems that really differs but always dose its function for which it is designed. thus, ventilation and air conditioning in some reactor hall constitute only one system whereas in some other ones, they are separate systems. the Egypt Research Reactor-2 (ETRR-2)represents the second type. most studies conducted on ventilation and air conditioning simulation models either in traditional building or for research rectors show that those models were not designed similarly to the model of the hall of ETRR-2 in which ventilation and air conditioning constitute two separate systems.besides, those studies experimented on ventilation and air conditioning simulation models of reactor building predict the temperature and humidity inside these buildings at certain outside condition and it is difficult to predict when the outside conditions are changed . also those studies do not discuss the influences of reactor power changes. therefore, the present work deals with a computational study backed by infield experimental measurements of the performance of the ventilation and air conditioning systems of reactor hall during normal operation at different outside conditions as well as at different levels of reactor power

  10. Monitoring of primary circuit and reactor of NPP A-1

    Nuclear Power Plant A-1 in Jaslovske Bohunice was commissioned in 1972. Heavy water moderated, carbon dioxide cooled channel type reactor was shut down after two accidents in 1977. During more serious second accident, the reduced coolant flow caused local overheating of the fuel and consequent damage/melting of the fuel channel. Both accidents had led to the damage of several fuel assemblies with extensive local damage of fuel claddings. As a consequence, the main cooling circuit was significantly contaminated by fission products and long-life alpha nuclides. The detailed monitoring of dose rates, smearable contamination and sampling of contamination was performed. Extended monitoring in reacto vessel, primary circuit pipes, turbo-compressors, steam generators, main valves, gas tanks and also heavy water system with collectors, coolers, distilling and purification station, pumps and valves was done. Appropriate devices and procedures for the monitoring and examination of the installations were prepared and applied. Obtained results will serve for the future planning of the decontamination and decommissioning works. The 3-D model of the reactor that had been developed as part of this Project proved invaluable for orientation, visualisation, planning and analysis of results. Dose rates were measured in the technological channels from the reactor hall floor to the bottom of the hot gas chamber in decrements of 1 m and 0.5 m. The highest absolute values of dose rates were found in channels located in the middle of the reactor (up to 1900 mGy/h in the active zone region). It is estimated that the total contaminated area of primary circuit equipment (pipework, steam generators and turbo-compressors) is some 48 000 m2. It follows that the total gamma contamination is of the order of 1014 to 1015 Bq and total alpha contamination 1011 to 1013 Bq. The total amount of deposits in the gas circuit is about 14.3 tons. (authors)

  11. Calderón de la Barca y Toledo

    Colomina Torner, Jaime

    2001-12-01

    Full Text Available In the last Year 2000, it was expired the fourth Centenary of Pedro Calderón de la Barca's birth. On the ocassion of this, He was remembered with several ceremonies in Spain. In Toledo the Royal Academy of FineArts and Historic Science, and the Cathedral Chapter give Him a great homage in the Royal Chapel in what occuped a post and job, being priest in 1653. The author of this biographic note participated in this homage, and when he looked into in same archives he found these dates that here are published apparently unknown, and they light up aspects of His biography.En el pasado año 2000 se cumplió el IV centenario del nacimiento de D. Pedro Calderón de la Barca. Con este motivo fue recordado en España con diversos actos. En Toledo, la Real Academia de B. Artes y C. Históricas y el Cabildo de la catedral le tributaron un solemne homenaje en la misma Real Capilla en la que ocupó una plaza, siendo ya sacerdote, a partir de 1653. El autor de esta nota biográfica participó en dicho homenaje, y al investigar en varios archivos halló estos datos, que aquí se publican, al parecer, inéditos y que iluminan aspectos de su biografía.

  12. Tritium content in atmospheric water vapor inside of the reactor hall (reactor R-A) in Institute Vinca

    Tritium content in atmospheric water vapour inside of the reactor hall was measured during the regular inspection of the fuel channels in Institute of Nuclear Sciences 'Vinca', in March and May 2006. Tritium content in HTO form varied from 1.56·102 Bqm-3 to 4.05·102 Bqm-3. Tritium concentrations in precipitation collected at Zeleno Brdo and Institute 'Vinca' during the 2006. were (-1 and (3.52 - 13.09) Bql-1, respectively. (author)

  13. Science Hall of Atomic Energy in Research Reactor Institute, Kyoto University

    The Science Hall of Atomic Energy was built as a subsidiary facility of the Research Reactor Institute, Kyoto University. The purpose of this facility is to accept outside demands concerning the application of the research reactor. The building is a two story building, and has the floor area of 901.47 m2. There are an exhibition room, a library, and a big lecture room. In the exhibition room, models of the Kyoto University Research Reactor and the Kyoto University Critical Assembly are placed. Various pictures concerning the application of the reactor are on the wall. In the library, people from outside of the Institute can use various books on science. Books for boys and girls are also stocked and used for public use. At the lecture room, various kinds of meeting can be held. (Kato, T.)

  14. Optimal Protection of Reactor Hall Under Nuclear Fuel Container Drop Using Simulation Methods

    Králik Juraj

    2014-12-01

    Full Text Available This paper presents of the optimal design of the damping devices cover of reactor hall under impact of nuclear fuel container drop of type TK C30. The finite element idealization of nuclear power plant structure is used in software ANSYS. The steel pipe damper system is proposed for dissipation of the kinetic energy of the container free fall in comparison with the experimental results. The probabilistic and sensitivity analysis of the damping devices was considered on the base of the simulation methods in program AntHill using the Monte Carlo method.

  15. Recent Results And Challenges In Development Of Metallic Hall Sensors For Fusion Reactors

    Ďuran, Ivan; Sentkerestiová, J.; Kohout, Michal; Mušálek, Radek; Viererbl, L.; Kovařík, Karel

    Vol. 1612. MELVILLE: American Institute of Physics, 2014 - (Gorini, G.; Orsitto, F.; Sozzi, C.; Tardocchi, M.), s. 31-34. (AIP Conference Proceedings. 1612). ISBN 978-0-7354-1248-4. ISSN 0094-243X. [International Conference on Fusion Reactor Diagnostics. Villa Monastero,Varenna (IT), 09.09.2013-13.09.2013] R&D Projects: GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 ; RVO:68378271 Keywords : Hall sensors * fusion * magnetic diagnostic * radiation hardness Subject RIV: BL - Plasma and Gas Discharge Physics; BL - Plasma and Gas Discharge Physics (FZU-D) http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4894020

  16. First Calderón Prize

    Rundell, William; Somersalo, Erkki

    2008-07-01

    The Inverse Problems International Association (IPIA) awarded the first Calderón Prize to Matti Lassas for his outstanding contributions to the field of inverse problems, especially in geometric inverse problems. The Calderón Prize is given to a researcher under the age of 40 who has made distinguished contributions to the field of inverse problems broadly defined. The first Calderón Prize Committee consisted of Professors Adrian Nachman, Lassi Päivärinta, William Rundell (chair), and Michael Vogelius. William Rundell For the Calderón Prize Committee Prize ceremony The ceremony awarding the Calderón Prize. Matti Lassas is on the left. He and William Rundell are on the right. Photos by P Stefanov. Brief Biography of Matti Lassas Matti Lassas was born in 1969 in Helsinki, Finland, and studied at the University of Helsinki. He finished his Master's studies in 1992 in three years and earned his PhD in 1996. His PhD thesis, written under the supervision of Professor Erkki Somersalo was entitled `Non-selfadjoint inverse spectral problems and their applications to random bodies'. Already in his thesis, Matti demonstrated a remarkable command of different fields of mathematics, bringing together the spectral theory of operators, geometry of Riemannian surfaces, Maxwell's equations and stochastic analysis. He has continued to develop all of these branches in the framework of inverse problems, the most remarkable results perhaps being in the field of differential geometry and inverse problems. Matti has always been a very generous researcher, sharing his ideas with his numerous collaborators. He has authored over sixty scientific articles, among which a monograph on inverse boundary spectral problems with Alexander Kachalov and Yaroslav Kurylev and over forty articles in peer reviewed journals of the highest standards. To get an idea of the wide range of Matti's interests, it is enough to say that he also has three US patents on medical imaging applications. Matti is

  17. Description of the magnox type of gas cooled reactor (MAGNOX)

    Jensen, S.E.; Nonboel, E

    1999-05-01

    The present report comprises a technical description of the MAGNOX type of reactor as it has been build in Great Britain. The Magnox reactor is gas cooled (CO{sub 2}) with graphite moderators. The fuels is natural uranium in metallic form, canned with a magnesium alloy called 'Magnox'. The Calder Hall Magnox plant on the Lothian coastline of Scotland, 60 km east of Edinburgh, has been chosen as the reference plant and is described in some detail. Data on the other stations are given in tables with a summary of design data. Special design features are also shortly described. Where specific data for Calder Hall Magnox has not been available, corresponding data from other Magnox plants has been used. The information presented is based on the open literature. The report is written as a part of the NKS/RAK-2 sub-project 3: 'Reactors in Nordic Surroundings', which comprises a description of nuclear power plants neighbouring the Nordic countries. (au)

  18. Theoretical analysis of nuclear reactors (Phase III), I-V, Part IV, Influence of isotopic composition of nuclear fuel on the reactivity with constant flux

    Part one of this report presents a series of differential equations describing the nuclear fuel depletion during reactor operation. This series of differential equations is extended to describe the fission products. This part includes equations for effective multiplication factor keff and reactivity ρ as a function of irradiation τ. Part two includes results obtained on the analog computer PACE 231 R, and related to Calder Hall type reactor. Part three covers detailed preparation of the series of equations for solution by using the analog computer. Part four includes the list of references related to this task

  19. Thickness measurement of A-1 reactor caisson tube walls

    The equipment is described of measuring the thickness of caisson pipes built in the Bohunice A-1 reactor. The pulse-type ultrasonic thickness gauge is based on the reflection method using the double probe. The measurement accuracy is 0.1 mm. (J.B.)

  20. Prospects Of Steady State Magnetic Diagnostic Of Fusion Reactors Based On Metallic Hall Sensors

    Ďuran, Ivan; Sentkerestiová, J.; Kovařík, Karel; Viererbl, L.

    Vol. 1442. MELVILLE: American Institute of Physics, 2012 - (Kallne, J.; Ryutov, D.; Gorini, G.; Sozzi, C.; Tardocchi, M.), s. 317-324. (AIP Conference Proceedings. 1442). ISBN 978-0-7354-1038-1. ISSN 0094-243X. [International Workshop on Fusion Neutrons and Subcritical Nuclear Fission (FUNFI). Varenna (IT), 12.09.2011-15.09.2011] R&D Projects: GA MPO 2A-1TP1/101; GA MŠk(CZ) LM2011021 Institutional research plan: CEZ:AV0Z20430508 Keywords : Hall sensors * fusion * magnetic diagnostic * radiation hardness Subject RIV: BL - Plasma and Gas Discharge Physics http://proceedings.aip.org/resource/2/apcpcs/1442/1/317_1

  1. Welding of the A1 reactor pressure vessel

    As concerns welding, the A-1 reactor pressure vessel represents a geometrically complex unit containing 1492 welded joints. The length of welded sections varies between 10 and 620 mm. At an operating temperature of 120 degC and a pressure of 650 N/cm2 the welded joints in the reactor core are exposed to an integral dose of 3x1018 n/cm2. The chemical composition is shown for pressure vessel steel as specified by CSN 413090.9 modified by Ni, Ti and Al additions, and for the welding electrodes used. The requirements are also shown for the mechanical properties of the base and the weld metals. The technique and conditions of welding are described. No defects were found in ultrasonic testing of welded joints. (J.B.)

  2. First results and perspectives of CALDER

    Vignati, M.; Bellini, F.; Cardani, L.; Casali, N.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; Cruciani, A.; D`Addabbo, A.; Di Domizio, S.; Martinez, M.; Tomei, C.

    2016-07-01

    Large-mass arrays of bolometers proved to be good detectors for Neutrinoless Double Beta Decay (0 νββ) and Dark Matter searches. CUORE and LUCIFER are bolometric 0 νββ experiments which will start to take data in 2016 at Laboratori Nazionali del Gran Sasso in Italy. The sensitivity of CUORE could be increased by removing the background due to α particles, by detecting the small amount of Cherenkov light (100 eV) emitted by the βs' signal and not by αs. LUCIFER could be extended to detect also Dark Matter, provided that the background from β / γ particles (100 eV of scintillation light) is discriminated from nuclear recoils of about 10 keV energy (no light). CALDER is a project to develop light detectors for CUORE, LUCIFER and similar bolometric experiments. The goal is to obtain detectors with an active area of 5×5 cm2 (the face of bolometric crystals), operating at 10 mK, and with a baseline resolution better than 20 eV. We have chosen to develop phonon-mediated devices using Kinetic Inductance Detectors (KIDs). We present the first results and the perspectives of the project.

  3. Calderón’s method on an elliptical domain

    One possible application for electrical impedance tomography is in medical imaging where lung and heart function may be monitored. One drawback of current algorithms is that they are implemented for use in a circular domain, but a human thorax is more elliptical than circular. In this paper, a reconstruction algorithm based on the work of Calderón (1980 Seminar on Numerical Analysis and its Applications to Continuum Physics (Rio de Janeiro) pp 65–75) on the inverse conductivity problem is derived for an elliptical domain. It is explained how this reconstruction algorithm uses a transformed Dirichlet-to-Neumann map. Experimental results from an elliptical tank are given to show how correct domain modelling reduces the artefacts produced by this version of Calderón’s reconstruction algorithm. (paper)

  4. Decommissioning of commercial reactor

    Yui, Kohei [Japan Atomic Power Co., Tokyo (Japan)

    1997-02-01

    In the case of nuclear reactors, the diversion is often difficult as they are highly purposive, the disassembling is not easy as they are robust, and attention is required to handle the equipment containing radioactive substances. Decommissioning is defined as all the measures taken from the state that facilities become unused to the state of becoming green field. In Japan, already 40 years have elapsed since the effort for nuclear power was begun, and in this paper, the present state and future subjects of the decommissioning of nuclear power stations are summarized at the opportunity that the stop of commercial operation of Tokai Nuclear Power Station was decided recently. In the Tokai Nuclear Power Station, 166 MWe graphite-moderated, carbon dioxide-cooled reactor called improved Calder Hall type is installed, which started the operation in 1966. The circumstances of the decision to stop its operation are explained. The basic policy of the decommissioning of commercial nuclear power stations has been already published by the Advisory Committee for Energy. The state of the decommissioning in various foreign countries is reported. In Japan, the state of green field was realized in 1996 in the decommissioning of the JPDR in Japan Atomic Energy Research institute, and the decommissioning of the atomic powered ship ``Mutsu`` was completed. (K.I.)

  5. Tasks related to increase of RA reactor exploitation and experimental potential, 01. Designing the protection chamber in the RA reactor hall for handling the radioactive experimental equipment (I-II) Part II, Vol. II

    This second volume of the project for construction of the protection chamber in the RA reactor hall for handling the radioactive devices includes the technical description of the chamber, calculation of the shielding wall thickness, bottom lead plate, horizontal stability of the chamber, cost estimation, and the engineering drawings

  6. Performance of Hall sensor-based devices for magnetic field diagnosis at fusion reactors

    Bolshakova, I.; Ďuran, Ivan; Holyaka, R.; Hristoforou, E.; Marusenkov, A.

    2007-01-01

    Roč. 5, č. 1 (2007), s. 283-288. ISSN 1546-198X R&D Projects: GA AV ČR KJB100430504 Institutional research plan: CEZ:AV0Z20430508 Keywords : Galvanomagnetic * Sensor * Fusion Reactor * Magnetic Diagnostics * Radiation Hardness Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders Impact factor: 1.587, year: 2007

  7. Characterisation of metal in support of decommissioning a reactor site

    Calder Hall, located on the Sellafield Site in the North West of England, was the world's first commercial nuclear power station. It safely produced electricity for the national grid for 47 years before finally closing down in 2003. Since then, decommissioning activities have been taking place in order to reduce the hazard posed by the aged structures. In preparation for the removal of the 16 heat exchanger structures at Calder Hall, a phase of decommissioning work has been initiated which involves the removal of over 6000 te of pipework and structural steelwork surrounding the heat exchangers. To support the decommissioning and optimised waste routing of the metal, a programme of characterisation has been executed by the Sellafield Ltd Facility Characterisation team. The strategy sought to maximise the quantity of metal for unrestricted release from the site. In order to achieve this, there were numerous challenges which required investigative work and technical justifications to underpin the waste sentencing decisions. These included: - Depth profiling of metal to determine whether material in close proximity to the reactor was activated. - Coupon sampling of pipework to determine bulk activity concentrations of tritium. - Activity assessment of high radiation reactor gas pipework through modelling to avoid dose to sample team. - Sampling of paint coating structural steelwork to quantify activity concentrations resulting from an accumulation of over 50 years of atmospheric deposition. - Dose assessments on painted metal that underpinned the justification to release it from the site with minimal decontamination, despite trace levels of activity within the paint. Despite the challenges, comprehensive characterisation has enabled in excess of 90% to be sentenced as Radioactive Substances Act (RSA) '93 exempt material with no or limited treatment, enabling huge safety, environmental and cost savings to be realised. (author)

  8. The high temperature reactor - an interim balance of development and operation

    The high temperature reactor is the modern version of the gas cooled reactor. The interim balance presented in this report therefore refers to all gas cooled types of reactor, i.e. Magnox, AGR, and HTR. The period covered by the balance begins 28 years ago, when the British gas cooled reactor of Calder Hall went critical for the firt time. The experience accumulated with the German experimental HTR plant, the Juelich AVR reactor, has been extremely satisfactory, both with respect to the operating behaviour and to safety. The HTR fuel elements have a high safety margin against excessive operating temperatures. Although the dominating role played by the light water reactor line has so far prevented the commercial application of high temperature reactors, developments in recent years seem to indicate new market chances for the high temperature reactor line. In this connection, special importance attaches to the prototype THTR-300, which is about to be commissioned, and to the HTR-100 and HTR-500 conceptual design drafts and the modular reactor. As the design data of the THTR-300 and the HTR-500 are partly identical, the latter plant is characterized by foreseeable preparation and construction times; in addition, the licensability of the HTR-500 has already been confirmed. A medium sized reactor like this could be the link between electricity generation and the generation of process heat and space heat. (orig.)

  9. Characterization of the KID-Based Light Detectors of CALDER

    Casali, N; Cardani, L; Castellano, M G; Colantoni, I; Coppolecchia, A; Cosmelli, C; Cruciani, A; D'Addabbo, A; Di Dominio, S; Martinez, M; Tomei, C; Vignati, M

    2015-01-01

    The aim of the Cryogenic wide-Area Light Detectors with Excellent Resolution (CALDER) project is the development of light detectors with active area of $5\\times5$ cm$^2$ and noise energy resolution smaller than 20 eV RMS, implementing phonon-mediated kinetic inductance detectors. The detectors are developed to improve the background suppression in large-mass bolometric experiments such as CUORE, via the double read-out of the light and the heat released by particles interacting in the bolometers. In this work, we present the characterization of the first light detectors developed by CALDER. We describe the analysis tools to evaluate the resonator parameters (resonant frequency and quality factors) taking into account simultaneously all the resonance distortions introduced by the read-out chain (as the feed-line impedance and its mismatch) and by the power stored in the resonator itself. We detail the method for the selection of the optimal point for the detector operation (maximizing the signal-to-noise ratio...

  10. Characterization of the KID-Based Light Detectors of CALDER

    Casali, N.; Bellini, F.; Cardani, L.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; Cruciani, A.; D'Addabbo, A.; Di Domizio, S.; Martinez, M.; Tomei, C.; Vignati, M.

    2016-07-01

    The aim of the Cryogenic wide-Area Light Detectors with Excellent Resolution (CALDER) project is the development of light detectors with active area of 5 × 5 cm2 and noise energy resolution smaller than 20 eV RMS, implementing phonon-mediated kinetic inductance detectors. The detectors are developed to improve the background suppression in large-mass bolometric experiments such as CUORE, via the double read-out of the light and the heat released by particles interacting in the bolometers. In this work, we present the characterization of the first light detectors developed by CALDER. We describe the analysis tools to evaluate the resonator parameters (resonant frequency and quality factors) taking into account simultaneously all the resonance distortions introduced by the read-out chain (as the feed-line impedance and its mismatch) and by the power stored in the resonator itself. We detail the method for the selection of the optimal point for the detector operation (maximizing the signal-to-noise ratio). Finally, we present the response of the detector to optical pulses in the energy range of 0{-}30 keV.

  11. Sharp dyadic coverings and nondoubling Calder\\'on-Zygmund theory

    Conde, Jose M; Parcet, Javier

    2012-01-01

    We construct a family of n+1 dyadic filtrations in R^n, so that every Euclidean ball B is contained in some cube Q of our family satisfying diam(Q) \\le c_n diam(B) for some dimensional constant c_n. Our dyadic covering is optimal on the number of filtrations and improves previous results of Christ and Garnett/Jones by extending a construction of Mei for the n-torus. Based on this covering and motivated by applications to matrix-valued functions, we provide a dyadic nondoubling Calder\\'on-Zygmund decomposition which avoids Besicovitch type coverings in Tolsa's decomposition. We also use a recent result of Hyt\\"onen and Kairema to extend our dyadic nondoubling decomposition to the more general setting of upper doubling metric spaces.

  12. CALDER: cryogenic light detector for rare events search

    Pagnanini, L; Bellini, F; Calvo, M; Cardani, L; Casali, N; Castellano, M G; Colantoni, I; Coppolecchia, A; Cosmelli, C; Cruciani, A; De Bernardis, P; Di Domizio, S; D'Addabbo, A; Martinez, M; Masi, S; Tomei, C; Vignati, M

    2015-01-01

    The CALDER project aims at developing cryogenic light detectors with high sensitivity to UV and visible light, to be used for particle tagging in massive bolometers. Indeed the sensitivity of CUORE can be increased by a factor of 3, thanks to the reduction of the $\\alpha$-background, obtained by detecting the Cherenkov light (100 eV) emitted by $\\beta/\\gamma$ events. Currently used light detectors have not the features required to address this task, so we decided to develop a new light detector using Kinetic Inductance Detector as a sensor. This approach is very challenging and requires an intensive R$\\&$D to be satisfied. The first results of this activity are shown in the following.

  13. Thirtieth anniversary of reactor accident in A-1 Nuclear Power Plant Jaslovske Bohunice

    The facts about reactor accidents in A-1 Nuclear Power Plant Jaslovske Bohunice, Slovakia are presented. There was the reactor KS150 (HWGCR) cooled with carbon dioxide and moderated with heavy water. A-1 NPP was commissioned on December 25, 1972. The first reactor accident happened on January 5, 1976 during fuel loading. This accident has not been evaluated according to the INES scale up to the present time. The second serious accident in A-1 NPP occurred on February 22, 1977 also during fuel loading. This INES level 4 of reactor accident resulted in damaged fuel integrity with extensive corrosion damage of fuel cladding and release of radioactivity into the plant area. The A-1 NPP was consecutively shut down and is being decommissioned in the present time. Both reactor accidents are described briefly. Some radioecological and radiobiological consequences of accidents and contamination of area of A-1 NPP as well as of Manivier Canal and Dudvah River as result of flooding during the decommissioning are presented (authors)

  14. Welding electrode for peripheral welds of A-1 reactor pressure vessel

    The properties are outlined of the VUZ-AC1-52 welding electrode used in welding the Bohunice A-1 reactor pressure vessel. The mechanical properties of welded joints after the final thermal treatment are summed up. (J.K.)

  15. CALDER: Cryogenic light detectors for background-free searches

    Cardani, L.; Bellini, F.; Casali, N.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; Cruciani, A.; Di Domizio, S.; Tomei, C.; Vignati, M.

    2015-08-01

    The development of background-free detectors is essential for experiments searching for rare events. Bolometers, that are among the most competitive devices for the study of neutrino-less double beta decay (0νDBD) and Dark Matter interactions, suffer from the absence of techniques that allow to identify the nature of the interacting particles. This limit can be overcome by coupling the bolometer to an independent device for the measurement of the light emitted by interactions, as the combined read-out of the bolometric and light signals allows to identify and reject particles different from those of interest. CUORE, the most advanced bolometric experiment for 0νDBD searches, could disentangle the electrons produced by 0νDBD from the dangerous background due to α particles, by measuring the (tiny) Cherenkov light emitted by electrons and not by α's. LUCIFER, a project based on ZnSe scintillating bolometers for the study of 82Se 0νDBD, would be competitive also in the search of Dark Matter interactions if equipped with light detectors that allow to distinguish and reject the background due to electrons and γ's. These advances require cryogenic detectors characterized by noise lower than 20 eV, large active area, wide temperature range of operation, high radio-purity and ease in fabricating hundreds of channels. The CALDER collaboration aims to develop such detectors by exploiting the superb energy resolution and natural multiplexed read-out provided by Kinetic Inductance Detectors.

  16. Magnetic Measuring Instrumentation with Radiation-Resistant Hall Sensors for Fusion Reactors: Experience of Testing at JET

    Bolshakova, I.; Quercia, A.; Coccorese, V.; Murari, A.; Holyaka, R.; Ďuran, Ivan; Viererbl, L.; Konopleva, R.; Yerashok, V.

    2012-01-01

    Roč. 59, č. 4 (2012), s. 1224-1231. ISSN 0018-9499. [International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications. Ghent, 06.06.2011-09.06.2011] R&D Projects: GA ČR GAP205/10/2055 Institutional research plan: CEZ:AV0Z20430508 Keywords : plasma * tokamak * JET * Hall probes * radiation resistance Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.219, year: 2012

  17. CALDER: Cryogenic light detectors for background-free searches

    Cardani, L. [Dipartimento di Fisica - Sapienza Università di Roma, Roma - Italy and Physics Department, Princeton University, Princeton, NJ (United States); Bellini, F.; Casali, N.; Coppolecchia, A.; Cosmelli, C.; Cruciani, A.; Vignati, M. [Dipartimento di Fisica - Sapienza Università di Roma and INFN - Sezione di Roma, Roma - Italy (Italy); Castellano, M. G. [Istituto di Fotonica e Nanotecnologie - CNR, Roma - Italy (Italy); Colantoni, I. [Dipartimento di Fisica - Sapienza Università di Roma (Italy); Di Domizio, S. [Dipartimento di Fisica, Università di Genova, Genova - Italy and INFN Sezione di Genova, Genova - Italy (Italy); Tomei, C. [INFN - Sezione di Roma, Roma - Italy (Italy)

    2015-08-17

    The development of background-free detectors is essential for experiments searching for rare events. Bolometers, that are among the most competitive devices for the study of neutrino-less double beta decay (0νDBD) and Dark Matter interactions, suffer from the absence of techniques that allow to identify the nature of the interacting particles. This limit can be overcome by coupling the bolometer to an independent device for the measurement of the light emitted by interactions, as the combined read-out of the bolometric and light signals allows to identify and reject particles different from those of interest. CUORE, the most advanced bolometric experiment for 0νDBD searches, could disentangle the electrons produced by 0νDBD from the dangerous background due to α particles, by measuring the (tiny) Cherenkov light emitted by electrons and not by α’s. LUCIFER, a project based on ZnSe scintillating bolometers for the study of {sup 82}Se 0νDBD, would be competitive also in the search of Dark Matter interactions if equipped with light detectors that allow to distinguish and reject the background due to electrons and γ’s. These advances require cryogenic detectors characterized by noise lower than 20 eV, large active area, wide temperature range of operation, high radio-purity and ease in fabricating hundreds of channels. The CALDER collaboration aims to develop such detectors by exploiting the superb energy resolution and natural multiplexed read-out provided by Kinetic Inductance Detectors.

  18. CALDER: Cryogenic light detectors for background-free searches

    The development of background-free detectors is essential for experiments searching for rare events. Bolometers, that are among the most competitive devices for the study of neutrino-less double beta decay (0νDBD) and Dark Matter interactions, suffer from the absence of techniques that allow to identify the nature of the interacting particles. This limit can be overcome by coupling the bolometer to an independent device for the measurement of the light emitted by interactions, as the combined read-out of the bolometric and light signals allows to identify and reject particles different from those of interest. CUORE, the most advanced bolometric experiment for 0νDBD searches, could disentangle the electrons produced by 0νDBD from the dangerous background due to α particles, by measuring the (tiny) Cherenkov light emitted by electrons and not by α’s. LUCIFER, a project based on ZnSe scintillating bolometers for the study of 82Se 0νDBD, would be competitive also in the search of Dark Matter interactions if equipped with light detectors that allow to distinguish and reject the background due to electrons and γ’s. These advances require cryogenic detectors characterized by noise lower than 20 eV, large active area, wide temperature range of operation, high radio-purity and ease in fabricating hundreds of channels. The CALDER collaboration aims to develop such detectors by exploiting the superb energy resolution and natural multiplexed read-out provided by Kinetic Inductance Detectors

  19. High-Order Calderón Preconditioned Time Domain Integral Equation Solvers

    Valdes, Felipe

    2013-05-01

    Two high-order accurate Calderón preconditioned time domain electric field integral equation (TDEFIE) solvers are presented. In contrast to existing Calderón preconditioned time domain solvers, the proposed preconditioner allows for high-order surface representations and current expansions by using a novel set of fully-localized high-order div-and quasi curl-conforming (DQCC) basis functions. Numerical results demonstrate that the linear systems of equations obtained using the proposed basis functions converge rapidly, regardless of the mesh density and of the order of the current expansion. © 1963-2012 IEEE.

  20. Definiendo las reglas del juego: Calderón y el espacio virtual

    López-Martín, F.J. (Francisco Javier)

    2012-01-01

    Se presenta el modo en que Calderón involucra al espectador en La vida es sueño y Eco y Narciso haciéndole vivir una realidad imaginaria y se compara con el uso de la información y la intervención activa del público en videojuegos masivos como Diablo,World of Warcraft y Second Life, que tratan de reproducir algún aspecto de la realidad. Pese a la contemporaneidad del concepto de la «realidad virtual» se mantiene que Calderón, tres siglos antes, ya exploró distintos recursos para conseguir que...

  1. A Direct Numerical Reconstruction Algorithm for the 3D Calderón Problem

    Delbary, Fabrice; Hansen, Per Christian; Knudsen, Kim

    2011-01-01

    In three dimensions Calderón's problem was addressed and solved in theory in the 1980s in a series of papers, but only recently the numerical implementation of the algorithm was initiated. The main ingredients in the solution of the problem are complex geometrical optics solutions to the conducti...

  2. Stability of the Calder\\'on problem for less regular conductivities

    Caro, Pedro; Reyes, Juan Manuel

    2012-01-01

    In these notes we prove log-type stability for the Calder\\'on problem with $ C^{1,\\varepsilon}(\\bar{\\Omega}) $. We follow the lines of a recent work by Haberman and Tataru in which they prove uniqueness for $ C^1(\\bar{\\Omega}) $.

  3. Stability of the Calderón problem for less regular conductivities

    Caro, Pedro; García, Andoni; Reyes, Juan Manuel

    In these notes we prove log-type stability for the Calderón problem with conductivities in C(Ω¯). We follow the lines of a recent work by Haberman and Tataru in which they prove uniqueness for C1(Ω¯).

  4. Perspectivas para las bibliotecas universitarias : entrevista a Mónica Calderón

    2010-01-01

    Mónica Calderón is a librarian of the Library System of the Pontifical Catholic University of Peru, also is the president of Altamira, a consortium of academic libraries and currently is coordinating the Funnel-NACO Peru project.

  5. Weighted norm inequalities for the multilinear Calderón-Zygmund operators

    2010-01-01

    In this paper, by proving some suitable weighted endpoint estimates, and then by multilinear interpolation and a new multilinear extrapolation lemma, the author establishes some weighted estimates for the multilinear Calderón-Zygmund operator. Also, the author gives a weighted estimate for the corresponding commutator.

  6. Corrosion experiment on non standard austenitic steel A1, in reactor coolant water

    Experimental corrosion studies on non standard austenitic SS, A1, have been carried out. The samples were immersed in reactor coolant water medium with pH variation of 5.95, 6.0, 6.1, and 6.31. The experiments were carried out using a type of M-273 EG&G potentiostate/galvanometer test instrument. The post-corrosion samples' microstructure were analyzed with the aid of EDS (energy dispersive spectroscopy) equipped SEM instrument to detect the presence of any viable corrosion products. For further verification x-ray diffraction method was also used to detect any possible emerging corrosion products type on the samples' surfaces. Experimental results confirm that non standard austenitic SS immersed in reactor coolant water corrosion medium with a variation of concentration experience very little or almost no corrosion, and that according to the so-called Fontana's criteria these test-materials turn out to have an excellent resistance toward reactor coolant water corrosion medium. This is also evidenced by the very low corrosion rate value measured in this study. EDS study and X-ray diffraction results indicate that the possible ensuing corrosion by products are chrome oxides and iron oxides. (author)

  7. Mujer y travestismo en el teatro de Calderón

    Escalonilla López, Rosa Ana

    2001-06-01

    Full Text Available After a brief exposition regarding the situation, Calderón's recourse to travestism appears as the symbol of this theatre, mechanism of ideological transmission and unifying element of the whole of this dramatic production (profane, sacramental and brief. The ideological aspect is analysed and therein its relationship with womanhood. Herewith Calderón appears as a forerunner of modernism, since femenine roles distort the restriction imposed by a baroque society. As a result of travestism. Calderón's women do not fit the epoch's stereotypes. They transgress the activities and spaces assigned to their sex, protecting their honour and facing male authority. Definitely, women behave as complete human beings in equal condition to men.Tras una breve exposición del estado de la cuestión, se contempla el recurso del travestismo en Calderón desde su consideración como símbolo de su teatro, mecanismo de transmisión ideológica y elemento unificador de toda su dramaturgia (profana, sacramental y breve. Se analiza el aspecto ideológico y, dentro de éste, la conexión con el tema de la mujer. Calderón se nos revela, así, como precursor de la modernidad, pues los papeles femeninos violentan las restricciones impuestas por la sociedad barroca. Gracias al travestismo, las mujeres calderonianas se sitúan fuera de los estereotipos de la época, transgreden las actividades y los espacios destinados a su sexo, defienden su propio honor y se enfrentan a la autoridad masculina. La mujer es presentada, en definitiva, como un ser humano completo en igualdad de condiciones con el hombre.

  8. Hall A

    Federal Laboratory Consortium — The instrumentation in Hall A at the Thomas Jefferson National Accelerator Facility was designed to study electroand photo-induced reactions at very high luminosity...

  9. Hall Voltage with the Spin Hall Effect

    Pershin, Yu. V.; Di Ventra, M.

    2007-01-01

    The spin Hall effect does not generally result in a charge Hall voltage. We predict that in systems with inhomogeneous electron density in the direction perpendicular to main current flow, the spin Hall effect is instead accompanied by a Hall voltage. Unlike the ordinary Hall effect, we find that this Hall voltage is quadratic in the longitudinal electric field for a wide range of parameters accessible experimentally. We also predict spin accumulation in the bulk and sharp peaks of spin-Hall ...

  10. On Property () in Banach Lattices, Calderón–Lozanowskiĭ and Orlicz–Lorentz Spaces

    Paweł Kolwicz

    2001-08-01

    The geometry of Calderón–Lozanowskiĭ spaces, which are strongly connected with the interpolation theory, was essentially developing during the last few years (see [4, 9, 10, 12, 13, 17]). On the other hand many authors investigated property () in Banach spaces (see [7, 19, 20, 21, 25, 26]). The first aim of this paper is to study property () in Banach function lattices. Namely a criterion for property () in Banach function lattice is presented. In particular we get that in Banach function lattice property () implies uniform monotonicity. Moreover, property () in generalized Calderón–Lozanowskiĭ function spaces is studied. Finally, it is shown that in Orlicz–Lorentz function spaces property () and uniform convexity coincide.

  11. New global stability estimates for the Calder\\'on problem in two dimensions

    Santacesaria, Matteo

    2011-01-01

    We prove a new global stability estimate for the Gel'fand-Calder\\'on inverse problem on a two-dimensional bounded domain or, more precisely, the inverse boundary value problem for the equation $-\\Delta \\psi + v\\, \\psi = 0$ on $D$, where $v$ is a smooth real-valued potential of conductivity type defined on a bounded planar domain $D$. The principal feature of this estimate is that it shows that the more a potential is smooth, the more its reconstruction is stable, and the stability varies exponentially with respect to the smoothness (in a sense to be made precise). As a corollary we obtain a similar estimate for the Calder\\'on problem for the electrical impedance tomography.

  12. $L^p$-Continuity for Calderón–Zygmund Operator

    Q X Yang

    2005-05-01

    Given a Calderón–Zygmund (- for short) operator , which satisfies Hörmander condition, we prove that: if maps all the characteristic atoms to $W L^1$, then is continuous from $L^p$ to $L^p(1 < p < ∞)$. So the study of strong continuity on arbitrary function in $L^p$ has been changed into the study of weak continuity on characteristic functions.

  13. Monitoring the use of the Slaty Creek wildlife underpass, Calder Freeway, Black Forest, Macedon, Victoria, Australia

    Abson, Rodney N.; Lawrence, Ruth E.

    2003-01-01

    The Slaty Creek Wildlife Underpass was built into the Calder Freeway, Macedon, Victoria, to facilitate safe passage for species between forest block, now affected by this new section of freeway through the Black Forest. A 12-month monitoring regime was established, consisting of 14 monitoring methods to detect a variety of animals. Intensive sampling was conducted for one week per month, within the underpass, and with two control sites on either side of the underpass, along the Slaty Creek. T...

  14. A calderón multiplicative preconditioner for the combined field integral equation

    Bagci, Hakan

    2009-10-01

    A Calderón multiplicative preconditioner (CMP) for the combined field integral equation (CFIE) is developed. Just like with previously proposed Caldern-preconditioned CFIEs, a localization procedure is employed to ensure that the equation is resonance-free. The iterative solution of the linear system of equations obtained via the CMP-based discretization of the CFIE converges rapidly regardless of the discretization density and the frequency of excitation. © 2009 IEEE.

  15. Experimental direct digital control of the power plant A1 reactor based on a modern control theory approach

    The objective of the project was to accumulate technical experience with application of modern control theory in nuclear power by carrying out a case study of an experimental direct digital control at the A1 reactor about its nominal steady state. The research has proved that slightly modified method of solution of the linear stochastic regulator problem can be successfully applied in design of digital control system of nuclear power reactors

  16. Lipozyme IM-catalyzed interesterification for the production of margarine fats in a 1 kg scale stirred tank reactor

    Zhang, Hong; Xu, Xuebing; Mu, Huiling; Nilsson, J.; Adler-Nissen, Jens; Høy, Carl-Erik

    Lipozyme IM-catalyzed interesterification of the oil blend between palm stearin and coconut oil (75/25 w/w) was studied for the production of margarine fats in a 1 kg scale batch stirred tank reactor. Parameters such as lipase load, water content, temperature, and reaction time were investigated...

  17. Lipozyme IM-catalyzed interesterification for the production of margarine fats in a 1 kg scale stirred tank reactor

    Zhang, Hong; Xu, Xuebing; Mu, Huiling;

    2000-01-01

    Lipozyme IM-catalyzed interesterification of the oil blend between palm stearin and coconut oil (75/25 w/w) was studied for the production of margarine fats in a 1 kg scale batch stirred tank reactor. Parameters such as lipase load, water content, temperature, and reaction time were investigated...

  18. A UKAEA review of gas-cooled reactors in the United Kingdom

    The commercial use of nuclear power for electrical generation commenced in the UK in the 1950s with the Calder Hall reactors. Based on this concept, eighteen commercial reactor units, with two further units outside the UK, were constructed and have been in operation for periods ranging from 10 to 19 years. The paper reviews this experience mainly from the aspects of safety and the achieved costs, which compare favourably with current figures for fossil fired generation. The further development of the gas-cooled system in the UK commenced with the construction of the Windscale AGR, which came into operation in 1962. This led to the ordering of 14 large commercial AGR units, 4 of which have been in service since 1976, 6 are at an advanced stage of construction and 4 are at an early stage of construction. The paper reviews the main safety features of the AGR and considers the costs, taking achieved costs for the units which are in service and a combination of historical costs and projected costs for the units under construction. Again a clear advantage over fossil fuelled stations is shown. The paper also includes a preliminary account of the use of the prototype AGR at Windscale for the series of experiments concerning plateout, over-temperature in the fuel and simulated fault transients in the core which were carried out earlier in 1981. (author)

  19. Acalasia: estudio de 27 casos en el Hospital Calderón Guardia

    José A. Mainieri-Hidalgo

    2003-03-01

    Full Text Available Se estudiaron en forma retrospectiva los expedientes clínicos de 27 pacientes diagnosticados con acalasia en el Hospital Dr. R. A. Calderón Guardia (HCG vistos durante el período de 11 años comprendido entre 1991 y 2001, encontrando una tasa de 0.3 por 100.000 habitantes la cual es menor que la informada en la literatura. Esto posiblemente debido a que la ausencia en nuestro medio de manometría esofágica dificulta el diagnóstico de pacientes en estadio temprano o con enfermedad leve o moderada. La presentación clínica fue muy similar a la reportada por otros autores con una relación hombre mujer de 1.7 a 1 y edad promedio de 42 años. Los síntomas con un promedio de evolución de 7 años, fueron el más frecuente, la disfagia que se presentó en todos los casos, seguida de vómito, dolor torácico, pérdida de peso y datos de reflujo gastroesofágico. La esofagoscopía y la esofagografía mostraron hallazgos de enfermedad avanzada como dilatación esofágica importante, retención de restos alimentarios y cardias con espasmo que se superó fácilmente al presionar con el endoscopio. El tratamiento que se administró fue solamente médico (Nifedipina o Isorbide a 6 pacientes, dilataciones y tratamiento médico a 7 y quirúrgico (esofagomiotomía a 14, a tres de estos se les agregó un procedimiento anti-reflujo. La evolución se valoró con base en datos clínicos, encontrando que todos los pacientes con tratamiento médico y dilataciones continúan sintomáticos y con tratamiento. De los operados hay uno que ha requerido dilataciones 5 y 9 años después de la intervención, dos que no tuvieron procedimiento anti-reflujo, están en tratamiento por este problema y el resto se encuentran asintomáticos sin que se presentaran complicaciones quirúrgicas.This is a retrospecti ve study of the clinical records of 27 patients diagnosed with achalasia at the Dr. R. A. Calderón Guardia Hospital during a period of eleven years from 1991 to

  20. From Barclay to Calderón: the construction of the gracioso in Argenis and Poliarco

    Alicia Vara López

    2013-04-01

    Full Text Available Abstract: In 1621 the Argenis of John Barclay is published. A late Latin narrative that achieved a great success. Calderón decided to adapt this renowned story into his comedy Argenis y Poliarco(circa 1627. One of the biggest innovations of the author was the transformation of Poliarco’s gracioso, more suited to the theatrical ways of his time. In this paper we will analyze all the changes that Gelanor experimented from the narrative to the drama in order to become a proper graciosofor the Comedia Nueva.The analysis of all these metamorphoses will provide essential data about the role of this character in the comedy, but also will serve to study the modus scribendi of Calderón.Resumen:En 1621 se publica la Argenis de John Barclay, obra narrativa latina tardía que gozó de un éxito extraordinario en su época. Calderón decide adaptar tan celebrada historia y llevarla a las tablas en su comedia Argenis y Poliarco (circa 1627. Una de las mayores aportaciones del dramaturgo es la transformación del criado de Poliarco, Gelanor, en un gracioso propio de la comedia de su tiempo que se ajusta al marco teatral en el que aparece. En el presente trabajo se analizarán todos los cambios que experimenta Gelanor en su paso desde el molde narrativo al teatral, para convertirse en un prototípico gracioso de la comedia nueva. El examen de toda esta metamorfosis proporcionará claves acerca de la función del personaje en la comedia, pero también servirá para reflexionar acerca del modus scribendi calderoniano.

  1. Weighted norm inequalities for Toeplitz type operators associated to generalized Calderón-Zygmund operators.

    Tang, Yongli; Ban, Tao

    2016-01-01

    Let [Formula: see text] be a generalized Calderón-Zygmund operator or [Formula: see text] ( the identity operator), let [Formula: see text] and [Formula: see text] be the linear operators, and let [Formula: see text]. Denote the Toeplitz type operator by [Formula: see text]where [Formula: see text] and [Formula: see text] is fractional integral operator. In this paper, we establish the sharp maximal function estimates for [Formula: see text] when b belongs to weighted Lipschitz function space, and the weighted norm inequalities of [Formula: see text] on weighted Lebesgue space are obtained. PMID:27588245

  2. Calderón de la Barca en la obra de Mary W. Shelley

    Moro, Alfredo

    2015-01-01

    La influencia del teatro calderoniano en las letras inglesas ha recibido poca atención crítica, especialmente si comparamos el estudio de la recepción del autor áureo en Gran Bretaña con los trabajos dedicados a su influencia en tierras germanas. La recepción de la dramaturgia de Calderón en el Romanticismo británico sí ha despertado un mayor interés, particularmente en lo que se refiere al influjo del autor áureo en Percy B. Shelley. Pese a esta mayor atención, los intereses calderonianos de...

  3. Weighted Norm Inequalities with General Weights for the Commutator of Calderón

    Guo En HU; Yue Ping ZHU

    2013-01-01

    In this paper,by a sharp function estimate and an idea of Lerner,the authors establish some weighted estimates for the m-multilinear integral operator which is bounded from L1 (Rn) ×… × L1 (Rn)to L1/m,∞(Rn),and the associated kernel K(x; y1,…,ym) enjoys a regularity on the variable x.As an application,weighted estimates with general weights are given for the commutator of Calderón.

  4. Toeplitz Type Operators Associated with Generalized Calderón-Zygmund Operator on Weighted Morrey Spaces

    Bijun Ren

    2016-01-01

    Full Text Available Let T1 be a generalized Calderón-Zygmund operator or ±I (the identity operator, let T2 and T4 be the linear operators, and let T3=±I. Denote the Toeplitz type operator by Tb=T1MbIαT2+T3IαMbT4, where Mbf=bf and Iα is the fractional integral operator. In this paper, we investigate the boundedness of the operator Tb on weighted Morrey space when b belongs to the weighted BMO spaces.

  5. The Cuatrocientos milagros de la cruz of Jaime Bleda: a bedside book for Calderón?

    Sáez, Adrián J.

    2013-01-01

    Abstract:This paper explores the possible knowledge that some authors of the Golden Age may have about certain treatises of historical, philosophical and political nature, besides the well-known relations with other literary works, like the critics frequently have pointed out. So, this investigation compares the series of miracles that appear in La devoción de la cruz of Calderón with the book Cuatrocientos milagros de la cruz of Jaime Bleda, a religious treaty that Calderón might recalled in...

  6. Bronquiectasias, estudio de 36 pacientes intervenidos en el hospital “Dr. Rafael Ángel Calderón Guardia” Bronchiectasis, Results of Surgical Intervention in 36 Patients

    José Alberto Mainieri-Hidalgo

    2011-01-01

    Objetivo: Analizar el resultado de la cirugía por bronquiectasias en el Servicio de Cirugía de Tórax del Hospital Calderón Guardia. Método: Se revisaron los expedientes clínicos de 36 pacientes operados, con un total de 44 intervenciones por bronquiectasias. Resultados: Se encontró una prevalencia muy significativa de la enfermedad en mujeres, con una relación de 11 a 1. La etiología fue en 10 casos el antecedente de tuberculosis, en uno el síndrome de Kartagener, y en 25 no se logró establec...

  7. Direct physical measurements of independent fission yields at a 1-MW research reactor

    Over the past 20 yr, the number of nuclear reactors on university campuses in the United States has decreased from >70 to <40. Contrary to this trend, the University of Texas at Austin recently completed construction of a new reactor facility at a cost of $5.8 million. The TRIGA Mark II reactor in this facility will be licensed for 1.1-MW steady-state operation and $3.00 power-pulse transients. The new reactor facility was established to enhance the instructional and research opportunities in nuclear science and engineering for both undergraduate and graduate students at the University of Texas. In addition to neutron activation analysis, programs are being planned and equipment is being designed for neutron depth profiling, prompt gamma activation analysis, neutron radiography, and cold neutron research. Because of continued interest in fission-yield system developed by the author when he was at the University of Illinois. The operation of this unique system for the direct physical measurement of independent yields in thermal-neutron fission is reviewed in this paper

  8. Global stability for the multi-channel Gel'fand-Calder\\'on inverse problem in two dimensions

    Santacesaria, Matteo

    2011-01-01

    We prove a global logarithmic stability estimate for the multi-channel Gel'fand-Calder\\'on inverse problem on a two-dimensional bounded domain, i.e. the inverse boundary value problem for the equation $-\\Delta \\psi + v\\, \\psi = 0$ on $D$, where $v$ is a smooth matrix-valued potential defined on a bounded planar domain $D$.

  9. The Cuatrocientos milagros de la cruz of Jaime Bleda: a bedside book for Calderón?

    Adrián J. Sáez

    2013-04-01

    Full Text Available Abstract:This paper explores the possible knowledge that some authors of the Golden Age may have about certain treatises of historical, philosophical and political nature, besides the well-known relations with other literary works, like the critics frequently have pointed out. So, this investigation compares the series of miracles that appear in La devoción de la cruz of Calderón with the book Cuatrocientos milagros de la cruz of Jaime Bleda, a religious treaty that Calderón might recalled in order to write some passages of this comedy. Overall, this paper reveals data about the prodigious miscellany that may serve to other studies about this matter. Resumen:Este trabajo explora el posible conocimiento que algunos autores del Siglo de Oro pudieron tener de ciertos tratados de tema histórico, filosófico, político, etc., al margen de las relaciones con otras obras literarias, frecuentemente estudiadas por la crítica. Así, se pone en diálogo la serie de milagros que aparecen en La devoción de la cruz de Calderón con los Cuatrocientos milagros de la cruz de Jaime Bleda, un repertorio de milagros que Calderón pudo recordar a la hora de escribir algunos pasajes de esta comedia. Conjuntamente se da noticia de esta miscelánea de prodigios, que puede resultar de gran utilidad para otros estudios.

  10. Experimental halls workshop summary

    On May 26 and 27, 1976, approximately 50 people met for an informal workshop on plans for experimental halls for ISABELLE. Plans as they exist in the May 1976 version of the ISABELLE proposal were presented. Discussions were held on the following four general topics by separate working groups: (1) pros and cons of open areas as compared with enclosed halls; (2) experimental hall needs of ep, anti pp, and other options; (3) hall for the lepton detector; and (4) hall for the hadron spectrometer. The planning for experimental halls at PEP, the hall for the lepton detector, the hadron spectrometer, and open areas are discussed

  11. Quantum Hall effect

    Taylor, Simon

    2015-01-01

    The main goal of this project was to write a review about different quantum Hall effects. This review focuses on the integer and relativistic quantum Hall effect in graphene. The quantum Hall effect is a newly discovered phenomena that was experimentally observed in 1980 and relativistic quantum Hall effect in graphene was observed in 2005. This project takes a theoretical approach to describe the quantum Hall effects and graphene itself. Experiments has shown that for very strong magnetic fi...

  12. Un Grand Jour

    ACE Film

    1956-01-01

    On 17 October 1956, Her Majesty the Queen opened Reactor number 1 at Calder Hall, on the Cumbrian coast in northwest England, bringing into service the world's first industrial scale nuclear power station.The reactor at Calder Hall was a prototype of the Magnox gas cooled reactor(The Queen'speech. Much propagand for atomic energy. Scenes from the construction of the center.)

  13. Dosimetry of fission neutrons in a 1-W reactor, UTR-KINKI

    Endo, S; Yoshitake, Y

    2002-01-01

    The energy spectrum of fission neutrons in the biological irradiation field of the Kinki University reactor, UTR-KINKI, has been determined by a multi-foil activation analysis coupled with artificial neural network techniques and a Au-foil activation method. The mean neutron energy was estimated to be 1.26+-0.05 MeV from the experimentally determined spectrum. Based on this energy value and other information, the neutron dose rate was estimated to be 19.7+-1.4 cGy/hr. Since this dose rate agrees with that measured by a pair of ionizing chambers (21.4 cGy/hr), we conclude that the mean neutron energy could be estimated with reasonable accuracy in the irradiation field of UTR-KINKI. (author)

  14. A Calderón multiplicative preconditioner for coupled surface-volume electric field integral equations

    Bagci, Hakan

    2010-08-01

    A well-conditioned coupled set of surface (S) and volume (V) electric field integral equations (S-EFIE and V-EFIE) for analyzing wave interactions with densely discretized composite structures is presented. Whereas the V-EFIE operator is well-posed even when applied to densely discretized volumes, a classically formulated S-EFIE operator is ill-posed when applied to densely discretized surfaces. This renders the discretized coupled S-EFIE and V-EFIE system ill-conditioned, and its iterative solution inefficient or even impossible. The proposed scheme regularizes the coupled set of S-EFIE and V-EFIE using a Calderón multiplicative preconditioner (CMP)-based technique. The resulting scheme enables the efficient analysis of electromagnetic interactions with composite structures containing fine/subwavelength geometric features. Numerical examples demonstrate the efficiency of the proposed scheme. © 2006 IEEE.

  15. Para una teoría de la realidad virtual en Calderón

    J. L. Suárez

    2012-01-01

    Este artículo se vale del concepto de realidad virtual para analizar la obra de Calderón y enmarcarla en una concepción de la cultura entendida como espectáculo y entretenimiento. En esta concepción, la realidad virtual se entiende a partir de una clasificación que opone lo virtual a lo concreto, no a lo real, y que describe la cultura del Barroco como una época de creativos ensayos sobre la realidad virtual en la literatura y la cultura hispanas que va más allá de la representación y que tie...

  16. Acoustic Analysis for a Steam Dome and Pipings of a 1,100 MWe-Class Boiling Water Reactor

    For the integrity evaluation of steam dryers in up-rated nuclear power plants, we have applied acoustic analysis to a nuclear power plant steam dome and main steam pipings. We have selected a 1,100 MWe-class boiling water reactor as a subject of the analysis. We have constructed a three-dimensional finite element model, and conducted acoustic analyses. The analysis result suggested that the origin of steam pressure pulsation in high frequency range was due to vortex shedding at standpipes. (authors)

  17. Lipozyme IM-catalyzed interesterification for the production of margarine fats in a 1 kg scale stirred tank reactor

    Zhang, Hong; Xu, Xuebing; Mu, Huiling; Nilsson, Jörgen; Adler-Nissen, Jens; Høy, Carl-Erik

    2000-01-01

    Lipozyme IM-catalyzed interesterification of the oil blend between palm stearin and coconut oil (75/25 w/w) was studied for the production of margarine fats in a 1 kg scale batch stirred tank reactor. Parameters such as lipase load, water content, temperature, and reaction time were investigated...... higher temperature. Addition of water to the enzyme increased the contents of diacylglycerols and FFA in the products linearly. However, it had no effect on the degree of interesterification for the first batch when the enzyme was reused. Lipozyme IM was stable in the 10-batch test after adjusting the...

  18. El camino de la mina, vehículo de emociones en Calderón

    Rull, Enrique

    2002-12-01

    Full Text Available Calderón uses some scenic devices to stablish certain dramatic situations in the plays. The studied here is related to the function of the mine, which possessed important polisemic values. Not only it is used for stablishing a belie religious or a reat loving environement but also to use this motif with the metaphoric value of passion or as a true laberinto of love, includying trascendental mitological symbols. Everything together is aimed to create a very fast and mysterious activity mixing both comic and tragic effects in which the nonexpected becomes not only dramatical essence but also a personal experience about destinity and life.Calderón utiliza varios recursos escénicos para establecer determinadas situaciones dramáticas en sus obras. El que se estudia aquí se refiere a la función de la mina, que posee valores polisémicos muy notables, los cuales van desde los que le sirven para establecer un ámbito guerrero, religioso, amoroso de carácter real, hasta la utilización de este motivo con carácter metafórico de la pasión amorosa o como verdadero laberinto de amor que incluye incluso una mitologización trascendente de la misma. Todo ello le sirve para configurar en sus obras una acción trepidante, misteriosa, en la que se mezcla lo cómico con lo trágico, y en donde lo inesperado cobra un valor no sólo de esencia dramática sino también de vivencia existencial acerca del destino de la vida.

  19. Noncommutative Hall Effect

    Kokado, Akira; OKAMURA, TAKASHI; Saito, Takesi

    2002-01-01

    When coordinates are noncommutative, the Hall effect is reinvestigated. The Hall conductivity is expressed with noncommutative parameters, so that in the commutative limit it tends to the conventional result.

  20. Sellafield

    This small, illustrated, booklet describes Sellafield under the headings: introduction (historical and general); organisation (Windscale Works; Calder Works); Magnox reprocessing (using nuclear fuel in a reactor; transport of fuel; used fuel stored in ponds; decanning of Magnox fuel; separation process; highly-active storage tanks; vitrification); waste disposal; health and safety; Calder Hall; future developments; training young people; community relations. (U.K.)

  1. Topological Spin Hall Effect

    Yin, Gen; Liu, Yizhou; Barlas, Yafis; Zang, Jiadong; Lake, Roger K.

    2015-01-01

    The intrinsic spin Hall effect (SHE) originates from the topology of the Bloch bands in momentum space. The duality between real space and momentum space calls for a spin Hall effect induced from a real space topology in analogy to the topological Hall effect (THE) of skyrmions. We theoretically demonstrate the topological spin Hall effect (TSHE) in which a pure transverse spin current is generated from a skyrmion spin texture.

  2. Lipozyme IM-catalyzed interesterification for the production of margarine fats in a 1 kg scale stirred tank reactor

    Zhang, Hong; Xu, Xuebing; Mu, Huiling;

    2000-01-01

    Lipozyme IM-catalyzed interesterification of the oil blend between palm stearin and coconut oil (75/25 w/w) was studied for the production of margarine fats in a 1 kg scale batch stirred tank reactor. Parameters such as lipase load, water content, temperature, and reaction time were investigated...... interesterification. A Lipozyme IM load of 6% was required for a reaction of 6 h and at 60 °C, to reach a stable degree of interesterification. Temperature variation in the range of 50–75 °C did not affect the reaction degree as well as the contents of diacylglycerols, but the content of FFA slightly increased with...... higher temperature. Addition of water to the enzyme increased the contents of diacylglycerols and FFA in the products linearly. However, it had no effect on the degree of interesterification for the first batch when the enzyme was reused. Lipozyme IM was stable in the 10-batch test after adjusting the...

  3. Physics Investigations of a 670-Litre Steam-Cooled Fast-Reactor System in SNEAK, Assembly 3A-1

    A series of experiments is under way at the Karlsruhe fast zero power reactor SNEAK for the investigation of steam-cooled fast reactors in the 100-MW(e) range. This series started in May with the critical experiment of SNEAK 3A-1, a 670-litre uranium system containing 7.41 x 1020 atoms/cm3 of hydrogen in the form of polyethylene foils. The neutron physics of this assembly has been studied in detail. The neutron energy spectrum has been measured by various methods from the eV-region to more than 1 MeV in the core centre and at the periphery, reaction rates have been measured in the centre and in axial and radial traverses, and the initial breeding ratio and the reactivity worth of selected materials have been determined. Measurements of the Doppler reactivity effect, the steam void effect and of β/ℓ have been performed. Special attention has been given to the experimental investigation of heterogeneity effects. The experimental results are compared with calculations using the 26-group ABN set and a specially prepared 26-group cross-section set KFK-SNEAK using latest cross-section information and the SNEAK-3A spectrum as a weighting spectrum. The heterogeneity results are compared with theoretical models including space-dependent resonance self-shielding. The series of SNEAK-3 experiments is now being continued with the uranium Assembly 3A-2, which has about twice the hydrogen concentration of 3A-1. After the measurements in this system have been completed the inner part of the core will be replaced by an equivalent plutonium-fuelled zone thus forming the two-zone core SNEAK-3B. (author)

  4. Evolution of the isotopic composition of dissolved sulphate in Calders stream (Llobregat basin, NE Spain)

    The Calders stream is a tributary of the Llobregat River characterised by negative values of δ34S of dissolved sulphate, whereas in the Llobregat basin most of the reported values are positive. Stream waters were sampled monthly between 1997 and 1998 and quarterly in 1999. Data show an overall increase in δ34S from -10 per mille to 0 per mille, coupled with an increase in Na and Cl concentrations. This trend has a break on May 1998, with a maximum δ34S of +2 per mille. The oxygen isotopic composition of dissolved sulphate, δ18O, displays an opposite trend with a slightly decrease from +9 per mille to +6 per mille. The aim of the present study is to elucidate the origin of these negative values and to understand their evolution. Pristine stream water from a tributary has a δ34S = -18 per mille and δ18O = +2.5 per mille, in accordance with the reported values for the sulphate produced by pyrite oxidation in this area. Moreover, these values fall in the field of sulphate produced by sulphide oxidation in a δ18OSO4 vs 18OH2O plot. Therefore, negative δ34S values of Calders stream are interpreted as natural values obtained by leaching of bedrock, pyrite-bearing marls and limestones. In order to determine which processes caused the isotopic evolution described above, a detailed sampling up stream was performed on November 2000. It is interesting to notice the significant variation in major ions, with an increase of Cl and Na content in sample 6, which is progressively diluted downwaters. This change is recorded by a drastic δ34S enrichment from +0.3 per mille in site 7, to +21 per mille in site 6, and back to lower values downstream. Water chemistry and isotopic values of sample 3 can be explained by a mix between natural sources and fertilisers. Sample 7 has the same inputs that sample 3, with the contribution of pig manure, which is increasingly spread onto the field as a fertiliser (one sample of pig manure analysed has a δ34S = 0 per mille and a δ18O = +5

  5. Phonon-Mediated KIDs as Light Detectors for Rare-Event Search: The CALDER Project

    Cruciani, A.; Bellini, F.; Cardani, L.; Casali, N.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; D'Addabbo, A.; Di Domizio, S.; Martinez, M.; Tomei, C.; Vignati, M.

    2016-03-01

    Background suppression plays a crucial role in experiments searching for rare events, like neutrino-less double beta decay (0ν DBD) and dark matter. Large mass bolometers that are among the most competitive devices in this field would largely benefit from the development of ultrasensitive light detectors, as the combined readout of the bolometric and light signals enables the particle identification. The CALDER collaboration is developing cryogenic light detectors that will match the requirements of next generation experiments: noise lower than 20 eV RMS, large active area (several cm2), wide temperature range of operation, and ease in fabricating and operating a thousand of detectors. For this purpose, we are exploiting the excellent energy resolution and the natural multiplexed read-out provided by kinetic inductance detectors (KIDs). These devices can be operated in a phonon-mediated approach, in which KIDs are coupled to a large insulating substrate in order to increase the active surface from a few mm2 to 25 cm2 . Our current best prototype, based on aluminum LEKIDs, reached a baseline sensitivity of 80 eV with an overall efficiency of about 20 %.

  6. Phonon-Mediated KIDs as Light Detectors for Rare-Event Search: The CALDER Project

    Cruciani, A.; Bellini, F.; Cardani, L.; Casali, N.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; D'Addabbo, A.; Di Domizio, S.; Martinez, M.; Tomei, C.; Vignati, M.

    2016-08-01

    Background suppression plays a crucial role in experiments searching for rare events, like neutrino-less double beta decay (0ν DBD) and dark matter. Large mass bolometers that are among the most competitive devices in this field would largely benefit from the development of ultrasensitive light detectors, as the combined readout of the bolometric and light signals enables the particle identification. The CALDER collaboration is developing cryogenic light detectors that will match the requirements of next generation experiments: noise lower than 20 eV RMS, large active area (several cm2), wide temperature range of operation, and ease in fabricating and operating a thousand of detectors. For this purpose, we are exploiting the excellent energy resolution and the natural multiplexed read-out provided by kinetic inductance detectors (KIDs). These devices can be operated in a phonon-mediated approach, in which KIDs are coupled to a large insulating substrate in order to increase the active surface from a few mm2 to 25 cm2. Our current best prototype, based on aluminum LEKIDs, reached a baseline sensitivity of 80 eV with an overall efficiency of about 20 %.

  7. 30th and 29th anniversary of reactor accidents in A-1 nuclear power plant Jaslovske Bohunice - radioecological and radiobiological consequences

    In this paper authors present facts about construction, operation and reactor accidents in A-1 Nuclear Power Plant Jaslovske Bohunice, Slovakia. There was the reactor KS 150 (HWGCR) cooled with carbon dioxide and moderated with heavy water. A-1 NPP was commissioned on December 25, 1972. The first reactor accident happened on January 5, 1976 during fuel loading. Two persons of personal died by suffocation with carbon dioxide. This accident has been not evaluated according to the INES scale up to present time. The second serious accident in A-1 NPP occurred in February 22, 1977 also during fuel loading. This INES level 4 of reactor accident resulted in damaged fuel integrity with extensive corrosion damage of fuel cladding and release of radioactivity into the plant area. The A-1 NPP was consecutively shut down and is being decommissioned in the present time. Both reactor accidents are described in this paper. Some radioecological and radiobiological consequences of accidents and contamination of area of A-1 NPP as well as of Manivier canal and Dudvah River as result of flooding during the decommissioning are presented. (authors)

  8. Hall Viscosity and Electromagnetic Response

    Hoyos, Carlos; Son, Dam Thanh

    2011-01-01

    We show that, for Galilean invariant quantum Hall states, the Hall viscosity appears in the electromagnetic response at finite wave numbers q. In particular, the leading q dependence of the Hall conductivity at small q receives a contribution from the Hall viscosity. The coefficient of the q^2 term in the Hall conductivity is universal in the limit of strong magnetic field.

  9. Intrinsic Spin Hall Effect

    Murakami, Shuichi

    2005-01-01

    A brief review is given on the spin Hall effect, where an external electric field induces a transverse spin current. It has been recognized over 30 years that such effect occurs due to impurities in the presence of spin-orbit coupling. Meanwhile, it was proposed recently that there is also an intrinsic contribution for this effect. We explain the mechanism for this intrinsic spin Hall effect. We also discuss recent experimental observations of the spin Hall effect.

  10. Quantum Spin Hall Effect

    Bernevig, B.Andrei; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

    2010-01-15

    The quantum Hall liquid is a novel state of matter with profound emergent properties such as fractional charge and statistics. Existence of the quantum Hall effect requires breaking of the time reversal symmetry caused by an external magnetic field. In this work, we predict a quantized spin Hall effect in the absence of any magnetic field, where the intrinsic spin Hall conductance is quantized in units of 2 e/4{pi}. The degenerate quantum Landau levels are created by the spin-orbit coupling in conventional semiconductors in the presence of a strain gradient. This new state of matter has many profound correlated properties described by a topological field theory.

  11. Thermal-deformation effect of welding on A 1 reactor pressure vessel weld joints properties and state of stress

    The methods are compared of electroslag welding and of arc welding with a view to their possible application in welding the Bohunice A-1 reactor pressure vessel. Considered are the thermal deformation effects of welding on the physical properties and the stress present in welded joints. For testing, plates were used having the dimensions of 1100x2300x200 mm and rings with 4820 mm outer diameter, 1800 mm height and 170 mm thickness made of steel CSN 413O30 modified with Ni, Al+Ti. The deformation effect of welding on the residual surface and triaxial stress, the specific stored energy, the initiation temperature of brittle crack and the critical size of the initiation defect corresponding to the thermal deformation effect of welding were determined. It was found that for electroslag welding, there is a low probability of crack formation in the joints, a low level of residual stress and a low level of specific stored energy in a relatively wide joint zone. For arc welding there is a considerable probability of defect formation in the vicinity of the sharp boundary of the joint, a high level of the triaxial state of stress in the tensile region, and a high level of specific stored energy concentrated in the narrow zone of weld joints. The recommended thermal process is given for welding pressure vessels made of the CSN 413030 steel modified with Ni, Al+Ti, and 150 to 200 mm in thickness. (J.P.)

  12. Representation of the Indian in Calderón’s «La Aurora en Copacabana»

    José Elías Gutiérrez Meza

    2014-11-01

    Full Text Available The article analyzes the onomastics of the Indian characters, the portrayal of the Inca Empire of Huáscar and Atahualpa, and the Christianization of Guacolda and Yupangui in Calderón’s La Aurora en Copacabana. Rational and proactive, these two characters realize the illegitimacy of the Inca idolatry and embrace the true religion, long before the formal start of Perú’s christianization. Thus, it is argued that this specific representation of the Indian may have been influenced by the close circles indianos of Miguel de Aguirre, who allegedly patronized this comedy.

  13. Global uniqueness and reconstruction for the multi-channel Gel'fand-Calder\\'on inverse problem in two dimensions

    Novikov, Roman

    2010-01-01

    We study the multi-channel Gel'fand-Calder\\'on inverse problem in two dimensions, i.e. the inverse boundary value problem for the equation $-\\Delta \\psi + v(x) \\psi = 0$, $x\\in D$, where $v$ is a smooth matrix-valued potential defined on a bounded planar domain $D$. We give an exact global reconstruction method for finding $v$ from the associated Dirichlet-to-Neumann operator. This also yields a global uniqueness results: if two smooth matrix-valued potentials defined on a bounded planar domain have the same Dirichlet-to-Neumann operator then they coincide.

  14. Los Cuatrocientos milagros de la cruz de Jaime Bleda: ¿libro de cabecera de Calderón

    Sáez, Adrián J.

    2014-01-01

    This paper explores the possible knowledge that some authors of the Golden Age may have about certain treatises of historical, philosophical and political nature, besides the well-known relations with other literary works, like the critics frequently have pointed out. So, this investigation compares the series of miracles that appear in La devoción de la cruz of Calderón with the book Cuatrocientos milagros de la cruz of Jaime Bleda, a religious treaty that Calderón might recalled in order to...

  15. Reactors

    Purpose: To provide a spray cooling structure wherein the steam phase in a bwr reactor vessel can sufficiently be cooled and the upper cap and flanges in the vessel can be cooled rapidly which kept from direct contaction with cold water. Constitution: An apertured shielding is provided in parallel spaced apart from the inner wall surface at the upper portion of a reactor vessel equipped with a spray nozzle, and the lower end of the shielding and the inner wall of the vessel are closed to each other so as to store the cooling water. Upon spray cooling, cooling water jetting out from the nozzle cools the vapor phase in the vessel and then hits against the shielding. Then the cooling water mostly falls as it is, while partially enters through the apertures to the back of the shielding plate, abuts against stoppers and falls down. The stoppers are formed in an inverted L shape so that the spray water may not in direct contaction with the inner wall of the vessel. (Horiuchi, T.)

  16. Spontaneous Quantum Hall Liquids

    Zhang, Fan

    2012-02-01

    Driven by electron-electron interactions, bilayer graphene and its thicker cousins, chirally (ABC) stacked multilayers, exhibit a variety of distinct broken symmetry states in which each spin-valley flavor spontaneously transfers charge between layers, because of their flat touching bands and large pseudospin chiralities. These gapped states are accompanied by large momentum space Berry curvatures and different types of topological orders. These competing ground states are distinguished by their flavor Hall conductivities, orbital magnetizations, edge state properties, and response to external fields. These spontaneous quantum Hall (SQH) states at zero field smoothly evolve into quantum Hall ferromagnet states at finite field. Various phase transitions occur by tuning carrier densities, temperature, and external fields. Recently, SQH states have started to be observed and explored in transport and Hall experiments on suspended devices with dual gates.

  17. Halls Lake 1990

    National Oceanic and Atmospheric Administration, Department of Commerce — Salt marsh habitats along the shoreline of Halls Lake are threatened by wave erosion, but the reconstruction of barrier islands to reduce this erosion will modify...

  18. General footage ISOLDE experimental hall

    2016-01-01

    Overview of the ISOLDE experimental hall. Equipment and experiments. Taken from the WITCH / EBIS platform: ISOLDE hall infrastructure, GHM line, LA1, LA2, LA0, central beamline, COLLAPS experiment, CRIS experiment, ISOLTRAP experiment, laser guidance from building 508 into the hall for laser spectroscopy COLLAPS and CRIS. Taken from the HIE ISOLDE shielding tunnel roof: ISOLDE hall infrastructure, WITCH experiment, VITO line, TAS experiment. General footage: High Tension room entrance and EBIS platform, staircases and passages in the experimental hall.

  19. Investigation of impact of neutron irradiation on properties of InSb-based hall plates

    Ďuran, Ivan; Oszwaldowski, M.; Kovařík, Karel; Jankowski, J.; El-Ahmar, S.; Viererbl, L.; Lahodová, Z.

    2011-01-01

    Roč. 417, 1-3 (2011), s. 846-849. ISSN 0022-3115. [International Conference on Fusion Reactor Materials (ICFRM)/14./. Sapporo, 07.09.2009-12.09.2009] R&D Projects: GA MPO 2A-1TP1/101 Institutional research plan: CEZ:AV0Z20430508 Keywords : tokamak * Hall sensors * magnetic measurements * neutron irradiation Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 2.052, year: 2011 http://www.sciencedirect.com/science/article/pii/S0022311510009712

  20. Quantum Hall Effects

    Goerbig, M. O.

    2009-01-01

    These lecture notes yield an introduction to quantum Hall effects both for non-relativistic electrons in conventional 2D electron gases (such as in semiconductor heterostructures) and relativistic electrons in graphene. After a brief historical overview in chapter 1, we discuss in detail the kinetic-energy quantisation of non-relativistic and the relativistic electrons in a strong magnetic field (chapter 2). Chapter 3 is devoted to the transport characteristics of the integer quantum Hall eff...

  1. The quantum hall effect

    Transport phenomena in two dimensional semiconductors have revealed unusual properties. In this thesis these systems are considered and discussed. The theories explain the Integral Quantum Hall Effect (IQHE) and the Fractional Quantum Hall Effect (FQHE). The thesis is composed of five chapters. The first and the second chapters lay down the theory of the IQHE, the third and fourth consider the theory of the FQHE. Chapter five deals with the statistics of particles in two dimension. (author). Refs

  2. Spin Hall Effect

    Schliemann, John

    2006-01-01

    It is proposed that when a charge current circulates in a paramagnetic metal a transverse spin imbalance will be generated, giving rise to a 'spin Hall voltage'. Similarly, that when a spin current circulates a transverse charge imbalance will be generated, hence a Hall voltage, in the absence of charge current and magnetic field. Based on these principles we propose an experiment to generate and detect a spin current in a paramagnetic metal.

  3. Spin Hall noise

    Kamra, A.; Witek, F.P.; Meyer, S.; Huebl, H.; Geprägs, S.; Gross, R.; Bauer, G. E. W.; Goennenwein, S. T. B.

    2014-01-01

    We measure the low-frequency thermal fluctuations of pure spin current in a Platinum film deposited on yttrium iron garnet via the inverse spin Hall effect (ISHE)-mediated voltage noise as a function of the angle $\\alpha$ between the magnetization and the transport direction. The results are consistent with the fluctuation dissipation theorem in terms of the recently discovered spin Hall magnetoresistance (SMR). We present a microscopic description of the $\\alpha$ dependence of the voltage no...

  4. Swimming hall water treatment

    Valtonen, Jukka

    2015-01-01

    The purpose of this thesis was to see how ultraviolet light-treatment can improve water disinfection at Pori central swimming hall. The swimming hall has already an option for ultraviolet disinfection system, but there hasn’t been any immediate need for it to be utilized in combination with more conventional water treatment methods. Nevertheless, growing visitor numbers are already straining the swimming hall’s water treatment systems and some improvement was h...

  5. Experimental Hall design considerations

    General requirements for experimental halls at the Fermilab Collider are set forth, and specific designs for two halls are presented, one for the Detector Group's large ''W detector'' and the other for several smaller setups and for ep experiments. The physics which cannot be studied with the W detector is surveyed, and it is recommended that the second area incorporate a transposed geometry to allow small angle experiments. The most important recommendations are (1) that the halls have good access and the possibility of changing entire setups during short shutdowns, (2) that both equal energy (anti pp) and unequal energy (pp, ep) experiments be accommodated, (3) that construction take place during the superconducting ring installation, (4) that the halls incorporate assembly areas in which detectors can be built and serviced during machine operation and (5) that detailed design, including radiation safety calculations and muon background measurements, begin immediately. Some basic questions concerning the nature of the experimental halls needed for colliding beam experiments at Fermilab are discussed. General requirements and design considerations are dealt with first, followed by specific proposals for the layout of actual halls

  6. Fast micro Hall effect measurements on small pads

    Østerberg, Frederik Westergaard; Petersen, Dirch Hjorth; Nielsen, Peter F.;

    2011-01-01

    square onto the infinite half-plane, where well-established solutions are known. Hall effect measurements are performed to show, experimentally, that it is possible to measure Hall mobility in less than one minute on squares as small as 7070 lm2 with a deviation of 66.5% on a 1r level from accurate...

  7. Bronquiectasias, estudio de 36 pacientes intervenidos en el hospital “Dr. Rafael Ángel Calderón Guardia”

    José Alberto Mainieri-Hidalgo

    2011-09-01

    Full Text Available Objetivo: Analizar el resultado de la cirugía por bronquiectasias en el Servicio de Cirugía de Tórax del Hospital Calderón Guardia. Método: Se revisaron los expedientes clínicos de 36 pacientes operados, con un total de 44 intervenciones por bronquiectasias. Resultados: Se encontró una prevalencia muy significativa de la enfermedad en mujeres, con una relación de 11 a 1. La etiología fue en 10 casos el antecedente de tuberculosis, en uno el síndrome de Kartagener, y en 25 no se logró establecer. Todos los pacientes tenían antecedente de tos y expectoración mucopurulenta de larga evolución, y 29 habían sido clasificados como asmáticos, aunque 10 no tenían ningún antecedente familiar. La radiografía de tórax fue anormal en todos los casos, mostrando áreas de fibrosis, infiltrados o nódulos, pero no fue útil para establecer el diagnóstico de bronquiectasias, contrario a la TAC, que en todos mostró las lesiones bronquiales. El resultado de la cirugía, contrario a lo esperado, no logró establecer un indicador de éxito, pues pacientes con lesiones muy localizadas continuaron expectorando e infectándose, y otros con patología difusa y bilateral, mejoraron sustancialmente. Conclusiones: La cirugía por bronquiectasias está indicada cuando el tratamiento médico no logra controlar satisfactoriamente los cuadros infecciosos bronquiales. Existe franca posibilidad de mejoría, pero no un indicador de éxito para el procedimiento quirúrgico.

  8. Dose Distribution Mapping at Reactor TRIGA PUSPATI

    Reactor has been classified as one of the radiation control area in Malaysian Nuclear Agency. Currently, to monitor the radiation and contamination level of the environment around reactor, an area radiation monitoring (ARM) system has been installed in several strategic locations. Besides that, monthly dose exposure was also measured in certain areas by Health Physics Group using thermo luminescent dosimeter (TLD). Most of these devices were installed at the reactor building wall or wide from working areas. Hence, there are possibilities that radiation workers may exposed to higher radiological risk compared to the values measured in these devices. In this study, dose rate distribution was determined in reactor hall. A 1x1 meter grid was used to locate the reading spots for the dose distribution mapping. Measurement was made using portable gamma survey meter (Ludlum Model 5) at ground level and 1 meter from ground. These data development may contribute in the planning of suitable working time in reactor hall area and reduce the chances of receiving annual dose exposure exceeding the recommended limit among the radiation workers. (author)

  9. Conducting Wall Hall Thrusters

    Goebel, Dan M.; Hofer, Richard R.; Mikellides, Ioannis G.; Katz, Ira; Polk, James E.; Dotson, Brandon

    2013-01-01

    A unique configuration of the magnetic field near the wall of Hall thrusters, called Magnetic Shielding, has recently demonstrated the ability to significantly reduce the erosion of the boron nitride (BN) walls and extend the life of Hall thrusters by orders of magnitude. The ability of magnetic shielding to minimize interactions between the plasma and the discharge chamber walls has for the first time enabled the replacement of insulating walls with conducting materials without loss in thruster performance. The boron nitride rings in the 6 kW H6 Hall thruster were replaced with graphite that self-biased to near the anode potential. The thruster efficiency remained over 60% (within two percent of the baseline BN configuration) with a small decrease in thrust and increase in Isp typical of magnetically shielded Hall thrusters. The graphite wall temperatures decreased significantly compared to both shielded and unshielded BN configurations, leading to the potential for higher power operation. Eliminating ceramic walls makes it simpler and less expensive to fabricate a thruster to survive launch loads, and the graphite discharge chamber radiates more efficiently which increases the power capability of the thruster compared to conventional Hall thruster designs.

  10. Nonlocal Anomalous Hall Effect

    Zhang, Steven S.-L.; Vignale, Giovanni

    2016-04-01

    The anomalous Hall (AH) effect is deemed to be a unique transport property of ferromagnetic metals, caused by the concerted action of spin polarization and spin-orbit coupling. Nevertheless, recent experiments have shown that the effect also occurs in a nonmagnetic metal (Pt) in contact with a magnetic insulator [yttrium iron garnet (YIG)], even when precautions are taken to ensure that there is no induced magnetization in the metal. We propose a theory of this effect based on the combined action of spin-dependent scattering from the magnetic interface and the spin-Hall effect in the bulk of the metal. At variance with previous theories, we predict the effect to be of first order in the spin-orbit coupling, just as the conventional anomalous Hall effect—the only difference being the spatial separation of the spin-orbit interaction and the magnetization. For this reason we name this effect the nonlocal anomalous Hall effect and predict that its sign will be determined by the sign of the spin-Hall angle in the metal. The AH conductivity that we calculate from our theory is in order of magnitude agreement with the measured values in Pt /YIG structures.

  11. Validation testing of solute transport modelling using SHETRAN. The Calder Hollow experiments

    Hill-slope plot experiments were conducted at Calder Hollow, near Sellafield in West Cumbria, using lanthanum chloride (strongly sorbing) and strontium chloride (weakly sorbing) tracers in solution. Water and solute were injected via boreholes into a sand layer in a sequence of Quaternary drift deposits and the resulting subsurface transport plumes studied using core extraction and laboratory measurement of lanthanum, and fluid conductivity and bulk resistivity monitoring of strontium in an array of observation boreholes. Simulations of the field experiments were run using the SHETRAN hydrological modelling system. SHETRAN is a physically based, spatially distributed system. It was used to simulate the combined subsurface water flow (calibrated against field observations of piezometric head) and solute transport (uncalibrated, and run without any knowledge of the field observations for solute) taking place during the experiments. The results of the simulations were used to gauge the ability of SHETRAN to predict the subsurface transport of the lanthanum chloride and strontium chloride tracers in a validation exercise. The validation approach is based on the 'blind' method of Ewen and Parkin (1996), and involved using SHETRAN as it would be used in a real application. Ranges were established for the measured values of the physical properties of the porous media, supplemented by values from the literature, and these were used in conjunction with an analysis of calibrated flow simulations to create 48 SHETRAN parameter datasets for the lanthanum experiment and 16 for the strontium experiment. The datasets each led to a physically plausible simulation consistent with all the available information. A number of 'tests' were defined to compare model simulation results against field measurements. The simulations were used as a starting point to derive upper and lower 'bounds' for the model generated results, in order to incorporate uncertainty. Two teams produced distinct

  12. A calderón-preconditioned single source combined field integral equation for analyzing scattering from homogeneous penetrable objects

    Valdés, Felipe

    2011-06-01

    A new regularized single source equation for analyzing scattering from homogeneous penetrable objects is presented. The proposed equation is a linear combination of a Calderón-preconditioned single source electric field integral equation and a single source magnetic field integral equation. The equation is immune to low-frequency and dense-mesh breakdown, and free from spurious resonances. Unlike dual source formulations, this equation involves operator products that cannot be discretized using standard procedures for discretizing standalone electric, magnetic, and combined field operators. Instead, the single source equation proposed here is discretized using a recently developed technique that achieves a well-conditioned mapping from div- to curl-conforming function spaces, thereby fully respecting the space mapping properties of the operators involved, and guaranteeing accuracy and stability. Numerical results show that the proposed equation and discretization technique give rise to rapidly convergent solutions. They also validate the equation\\'s resonant free character. © 2006 IEEE.

  13. Hall Effect in Quasicrystals

    ZHOU Xiang; HU Cheng-zheng; GONG Ping; WANG Ai-jun

    2005-01-01

    The relations between Hall effect and symmetry are discussed for all 2- and 3 dimensional quasicrystals with crystallographically forbidden symmetries. The results show that the numbers of independent components of the Hall coefficient (RH) are one for 3-dimensional quasicrystals, two for those 2 dimensional quasicrystals whose symmetry group is non-Abelian, and three for those 2-dimensional quasicrystals whose symmetry group is Abelian, respectively. The quasicrystals with the same number of independent components have the same form of the components of RH.

  14. The quantized Hall effect

    The quantized Hall effect is theoretically explained in detail as are its basic properties. The explanation is completed with the pertinent mathematical relations and illustrative figures. Experimental data are critically assessed obtained by quantum transport measurement in a magnetic field on two-dimensional systems. The results are reported for a MOSFET silicon transistor and for GaAs-AlxGa1-xAs heterostructures. The application is discussed of the quantized Hall effect in determining the fine structure constant or in implementing the resistance standard. (M.D.). 27 figs., 57 refs

  15. Hall Effect in a Plasma.

    Kunkel, W. B.

    1981-01-01

    Describes an apparatus and procedure for conducting an undergraduate laboratory experiment to quantitatively study the Hall effect in a plasma. Includes background information on the Hall effect and rationale for conducting the experiment. (JN)

  16. Model anisotropic quantum Hall states

    Qiu, R. -Z.; Haldane, F.D.M.; Wan, Xin; Yang, Kun; Yi, Su

    2012-01-01

    Model quantum Hall states including Laughlin, Moore-Read and Read-Rezayi states are generalized into appropriate anisotropic form. The generalized states are exact zero-energy eigenstates of corresponding anisotropic two- or multi-body Hamiltonians, and explicitly illustrate the existence of geometric degrees of in the fractional quantum Hall effect. These generalized model quantum Hall states can provide a good description of the quantum Hall system with anisotropic interactions. Some numeri...

  17. The quantum anomalous Hall effect

    LIU, CHAO-XING; Zhang, Shou-Cheng; Qi, Xiao-Liang

    2015-01-01

    The quantum anomalous Hall effect is defined as a quantized Hall effect realized in a system without external magnetic field. Quantum anomalous Hall effect is a novel manifestation of topological structure in many-electron systems, and may have potential applications in future electronic devices. In recent years, quantum anomalous Hall effect has been proposed theoretically and realized experimentally. In this review article, we provide a systematic overview of the theoretical and experimenta...

  18. The Fractional Quantum Hall Effect

    Rao, Sumathi

    1999-01-01

    We give a brief introduction to the phenomenon of the Fractional Quantum Hall effect, whose discovery was awarded the Nobel prize in 1998. We also explain the composite fermion picture which describes the fractional quantum Hall effect as the integer quantum Hall effect of composite fermions.

  19. Hall Sweet Home

    Oguntoyinbo, Lekan

    2011-01-01

    Many urban and commuter universities have their sights set on students who are unlikely to connect with the college and likely to fail unless the right strategies are put in place to help them graduate. In efforts to improve retention rates, commuter colleges are looking to an unusual suspect: residence halls. The author discusses how these…

  20. Sports hall in Prague

    Svobodová, Markéta

    Prague: Prostor - architektura, interiér, design, 2012 - (Švácha, R.), s. 204-207 ISBN 978-80-87064-09-2 Institutional support: RVO:68378033 Keywords : sports hall * Jiří Bendík * Václav Horák * Václav Krásný Subject RIV: AL - Art, Architecture, Cultural Heritage

  1. Laurance David Hall.

    Coxon, Bruce

    2011-01-01

    An account is given of the life, scientific contributions, and passing of Laurance David Hall (1938-2009), including his early history and education at the University of Bristol, UK, and the synthesis and NMR spectroscopy of carbohydrates and other natural products during ∼20 years of research and teaching at the University of British Columbia in Vancouver, Canada. Lists of graduate students, post-doctoral fellows, and sabbatical visitors are provided for this period. Following a generous endowment by Dr. Herchel Smith, Professor Hall built a new Department of Medicinal Chemistry at Cambridge University, UK, and greatly expanded his researches into the technology and applications of magnetic resonance imaging (MRI) and zero quantum NMR. MRI technology was applied both to medical problems such as the characterization of cartilage degeneration in knee joints, the measurement of ventricular function, lipid localization in animal models of atherosclerosis, paramagnetic metal complexes of polysaccharides as contrast agents, and studies of many other anatomical features, but also to several aspects of materials analysis, including food analyses, process control, and the elucidation of such physical phenomena as the flow of liquids through porous media, defects in concrete, and the visualization of fungal damage to wood. Professor Hall's many publications, patents, lectures, and honors and awards are described, and also his successful effort to keep the Asilomar facility in Pacific Grove, California as the alternating venue for the annual Experimental NMR Conference. Two memorial services for Professor Hall are remembered. PMID:21763510

  2. The Isolde experimental hall

    Laurent Guiraud

    2000-01-01

    General view of the Isotope-Separator On-Line (ISOLDE) hall. ISOLDE is dedicated to the production of a large variety of radioactive ion beams for many different experiments. Rare isotopes can be produced allowing the study of spectra for neutrino beam production.

  3. Spin Hall noise

    Kamra, A.; Witek, F.P.; Meyer, S.; Huebl, H.; Geprägs, S.; Gross, R.; Bauer, G.E.W.; Goennenwein, S.T.B.

    2014-01-01

    We measure the low-frequency thermal fluctuations of pure spin current in a platinum film deposited on yttrium iron garnet via the inverse spin Hall effect (ISHE)-mediated voltage noise as a function of the angle α between the magnetization and the transport direction. The results are consistent wit

  4. Anomalous Hall effect

    Nagaosa, N.; Sinova, Jairo; Onoda, S.; MacDonald, A. H.; Ong, N. P.

    2010-01-01

    Roč. 82, č. 2 (2010), s. 1539-1592. ISSN 0034-6861 Institutional research plan: CEZ:AV0Z10100521 Keywords : anomalous Hall effect * spintronics Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 51.695, year: 2010

  5. The radon monitoring system in Daya Bay Reactor Neutrino Experiment

    Chu, M. C.; Kwan, K. K.; Kwok, M. W.; Kwok, T.; Leung, J. K. C.; Leung, K. Y.; Lin, Y. C.; Luk, K. B.; Pun, C. S. J.

    2016-02-01

    We developed a highly sensitive, reliable and portable automatic system (H3) to monitor the radon concentration of the underground experimental halls of the Daya Bay Reactor Neutrino Experiment. H3 is able to measure radon concentration with a statistical error less than 10% in a 1-h measurement of dehumidified air (R.H. 5% at 25 °C) with radon concentration as low as 50 Bq/m3. This is achieved by using a large radon progeny collection chamber, semiconductor α-particle detector with high energy resolution, improved electronics and software. The integrated radon monitoring system is highly customizable to operate in different run modes at scheduled times and can be controlled remotely to sample radon in ambient air or in water from the water pools where the antineutrino detectors are being housed. The radon monitoring system has been running in the three experimental halls of the Daya Bay Reactor Neutrino Experiment since November 2013.

  6. The Radon Monitoring System in Daya Bay Reactor Neutrino Experiment

    Chu, M C; Kwok, M W; Kwok, T; Leung, J K C; Leung, K Y; Lin, Y C; Luk, K B; Pun, C S J

    2016-01-01

    We developed a highly sensitive, reliable and portable automatic system (H$^{3}$) to monitor the radon concentration of the underground experimental halls of the Daya Bay Reactor Neutrino Experiment. H$^{3}$ is able to measure radon concentration with a statistical error less than 10\\% in a 1-hour measurement of dehumidified air (R.H. 5\\% at 25$^{\\circ}$C) with radon concentration as low as 50 Bq/m$^{3}$. This is achieved by using a large radon progeny collection chamber, semiconductor $\\alpha$-particle detector with high energy resolution, improved electronics and software. The integrated radon monitoring system is highly customizable to operate in different run modes at scheduled times and can be controlled remotely to sample radon in ambient air or in water from the water pools where the antineutrino detectors are being housed. The radon monitoring system has been running in the three experimental halls of the Daya Bay Reactor Neutrino Experiment since November 2013.

  7. Leiomioma esofágico: Experiencia con diez casos operados en el "Hospital Dr. Rafael Ángel Calderón Guardia"

    2012-01-01

    Objetivo: informar la experiencia adquirida con la cirugía para leiomiomas esofágicos en el Servicio de Cirugía de Tórax del Hospital Dr. R. A. Calderón Guardia. Métodos: durante el período de 12 años comprendido entre 1999 y 2011, fueron referidos 14 pacientes con tumores submucosos del esófago al Servicio de Cirugía de Tórax del Hospital Calderón Guardia. En cuatro pacientes asintomáticos con tumores pequeños se decidió observar, y diez fueron operados, confirmándose el diagnóstico histológ...

  8. "Calderón en el Romea", taller interdisciplinar para Educación Secundaria: la experiencia pedagógica

    Caro Valverde, María Teresa; Gea Martínez, Fernando; Sánchez Mateos, Ana Rosa

    2008-01-01

    Trabajo descriptivo y reflexivo del proceso didáctico interdisciplinar y del valor pedagógico humanista de la experiencia de innovación educativa que dio lugar a la publicación "Calderón en el Romea", obra que recibió varios premios nacionales por parte de Santillana, y de la que fueron coordinadores los autores de este documento.

  9. Thermal strain effect of welding on the properties and stress state of welded joints in the pressure vessel of the A 1 reactor

    Results are presented of welding and detailed evaluation of test plates and rings of actual sizes, and the results are related directly to the determination of the thermal conditions of the welding of the A1 steel reactor vessel. Electro slag welding and automatic C02 welding were used. Details are given of the materials used and the conditions of the tests. Test results and analysis are given under the following heads: thermal cycles, microstructure, notch toughness; strain effect, stress state, specific accumulated energy; temperature of brittle crack initiation, the critical size of the initial flaw; conclusions. (U.K.)

  10. Transient thermal analysis of a 1:2 scale cask for research reactors nuclear spent fuel elements considering thermal contacts and irradiation

    This work shows the approach used to the numerical simulation of the thermal test of a 1:2 scale model of a dual purpose cask (transportation and/or storage) for spent fuel elements from nuclear research reactors. Conservatively, the cask impact limiters are not modeled. This test is part of the requirements for the qualification of transportation packages for nuclear reactors spent fuel elements. Also, it is part of an IAEA sponsored project which includes Latin American countries with research reactors. This cask model has a stainless steel double wall cylinder (which contains the biological lead shielding) with flat heads and internal structures to accommodate the fuel elements. The cask project is described briefly as well as the developed finite element model and the main adopted hypothesis to consider the non-linearities as thermal contacts, properties varying with the temperature, phase change (thermal shielding lead) using the enthalpy method, and radiation among the internal parts. The analysis will cover the 30 min heating condition at 800 deg C and about 2 hours of the cooling phase. As the main purpose of the paper is to present the proposed approach for the thermal test numerical simulation, only some preliminary numerical results are shown without any comparison to the experimental ones. (author)

  11. Spin Hall effects

    Sinova, Jairo; Valenzuela, Sergio O.; Wunderlich, J.; Back, C. H.; Jungwirth, T.

    2015-10-01

    Spin Hall effects are a collection of relativistic spin-orbit coupling phenomena in which electrical currents can generate transverse spin currents and vice versa. Despite being observed only a decade ago, these effects are already ubiquitous within spintronics, as standard spin-current generators and detectors. Here the theoretical and experimental results that have established this subfield of spintronics are reviewed. The focus is on the results that have converged to give us the current understanding of the phenomena, which has evolved from a qualitative to a more quantitative measurement of spin currents and their associated spin accumulation. Within the experimental framework, optical-, transport-, and magnetization-dynamics-based measurements are reviewed and linked to both phenomenological and microscopic theories of the effect. Within the theoretical framework, the basic mechanisms in both the extrinsic and intrinsic regimes are reviewed, which are linked to the mechanisms present in their closely related phenomenon in ferromagnets, the anomalous Hall effect. Also reviewed is the connection to the phenomenological treatment based on spin-diffusion equations applicable to certain regimes, as well as the spin-pumping theory of spin generation used in many measurements of the spin Hall angle. A further connection to the spin-current-generating spin Hall effect to the inverse spin galvanic effect is given, in which an electrical current induces a nonequilibrium spin polarization. This effect often accompanies the spin Hall effect since they share common microscopic origins. Both can exhibit the same symmetries when present in structures comprising ferromagnetic and nonmagnetic layers through their induced current-driven spin torques or induced voltages. Although a short chronological overview of the evolution of the spin Hall effect field and the resolution of some early controversies is given, the main body of this review is structured from a pedagogical

  12. Gas-flow detector for uranium contamination on finned-can surface of a reactor fuel

    This gas-flow detector is a gridded proportional-counter specially designed for detecting uranium contamination on the finned-can surface of a reactor fuel. A conventional proportional-counter constructed only by a cathode and collector can hardly detect alpha particles emitted from uranium which is contaminated on rugged surfaces such as those of the fins of a reactor-fuel can because of the lack of uniformity of the electric field near the surface. This is the reason why we have constructed the gridded proportional-counter. This counter comprises the fuel, a grid, collectors and a cathode which are cylindrical in construction and arranged coaxially. The fuel is placed in the centre of the grid and negative voltage is applied. The space between the fuel and the grid serves as an ion-collecting space. The grid is made of fine parallel tungsten wires which are constructed cylindrically around the fuel and connected to ground potential. The collectors are 16 fine tungsten wires constructed similarly to the grid, but each wire is electrically insulated from the others. Through 50-kΩ resistors all collectors are connected together and to positive high voltage via a feeding resistor. The space between the grid, the collectors and the cathode serves as a gas-multiplication space just like a conventional proportional-counter. Each 50-kΩ resistor separates the stray capacity of the connected collector from the others. The detector output is coupled with a low input-impedance-current amplifier. The low inputimpedance also lessens the bad influence of the stray capacity of the input circuitry. These result in a good S/N ratio and allow the sensitive detection of alpha particles. Before measurement, the counter is first evacuated by a rotary pump and then PR gas (A: 90%, Methane: 10%) is admitted. By the use of this new equipment we have successfully detected alpha particles emitted from 1 x 10-5 g natural-uranium contamination of the finned-can surface of a Calder Hall

  13. Spin Hall effect

    Sinova, Jairo; Valenzuela, O.V.; Wunderlich, Joerg; Back, C.H.; Jungwirth, Tomáš

    2015-01-01

    Roč. 87, č. 4 (2015), s. 1213-1259. ISSN 0034-6861 R&D Projects: GA MŠk(CZ) LM2011026; GA ČR GB14-37427G EU Projects: European Commission(XE) 268066 - 0MSPIN Institutional support: RVO:68378271 Keywords : spin Hall effect * spintronics Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 29.604, year: 2014

  14. Spin Hall effect devices

    Jungwirth, Tomáš; Wunderlich, Joerg; Olejník, Kamil

    2012-01-01

    Roč. 11, č. 5 (2012), s. 382-390. ISSN 1476-1122 EU Projects: European Commission(XE) 215368 - SemiSpinNet Grant ostatní: FP7 - ERC Advanced Grant 0MSPIN(XE) 268066; AVČR(CZ) Premium Academiae Institutional research plan: CEZ:AV0Z10100521 Keywords : spin Hall effect * spintronic s * spin transistor Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 35.749, year: 2012

  15. Spin Hall effect transistor

    Wunderlich, Joerg; Park, B.G.; Irvine, A.C.; Zarbo, Liviu; Rozkotová, E.; Němec, P.; Novák, Vít; Sinova, Jairo; Jungwirth, Tomáš

    2010-01-01

    Roč. 330, č. 6012 (2010), s. 1801-1804. ISSN 0036-8075 R&D Projects: GA AV ČR KAN400100652; GA MŠk LC510 Grant ostatní: EU FP7 SemiSpinNet(XE) 215368 Institutional research plan: CEZ:AV0Z10100521 Keywords : spin Hall effect * spintronics * spin transistor Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 31.364, year: 2010

  16. Quantum critical Hall exponents

    Lütken, C A

    2014-01-01

    We investigate a finite size "double scaling" hypothesis using data from an experiment on a quantum Hall system with short range disorder [1-3]. For Hall bars of width w at temperature T the scaling form is w(-mu)T(-kappa), where the critical exponent mu approximate to 0.23 we extract from the data is comparable to the multi-fractal exponent alpha(0) - 2 obtained from the Chalker-Coddington (CC) model [4]. We also use the data to find the approximate location (in the resistivity plane) of seven quantum critical points, all of which closely agree with the predictions derived long ago from the modular symmetry of a toroidal sigma-model with m matter fields [5]. The value nu(8) = 2.60513 ... of the localisation exponent obtained from the m = 8 model is in excellent agreement with the best available numerical value nu(num) = 2.607 +/- 0.004 derived from the CC-model [6]. Existing experimental data appear to favour the m = 9 model, suggesting that the quantum Hall system is not in the same universality class as th...

  17. Bronquiectasias, estudio de 36 pacientes intervenidos en el hospital “Dr. Rafael Ángel Calderón Guardia” Bronchiectasis, Results of Surgical Intervention in 36 Patients

    José Alberto Mainieri-Hidalgo

    2011-09-01

    Full Text Available Objetivo: Analizar el resultado de la cirugía por bronquiectasias en el Servicio de Cirugía de Tórax del Hospital Calderón Guardia. Método: Se revisaron los expedientes clínicos de 36 pacientes operados, con un total de 44 intervenciones por bronquiectasias. Resultados: Se encontró una prevalencia muy significativa de la enfermedad en mujeres, con una relación de 11 a 1. La etiología fue en 10 casos el antecedente de tuberculosis, en uno el síndrome de Kartagener, y en 25 no se logró establecer. Todos los pacientes tenían antecedente de tos y expectoración mucopurulenta de larga evolución, y 29 habían sido clasificados como asmáticos, aunque 10 no tenían ningún antecedente familiar. La radiografía de tórax fue anormal en todos los casos, mostrando áreas de fibrosis, infiltrados o nódulos, pero no fue útil para establecer el diagnóstico de bronquiectasias, contrario a la TAC, que en todos mostró las lesiones bronquiales. El resultado de la cirugía, contrario a lo esperado, no logró establecer un indicador de éxito, pues pacientes con lesiones muy localizadas continuaron expectorando e infectándose, y otros con patología difusa y bilateral, mejoraron sustancialmente. Conclusiones: La cirugía por bronquiectasias está indicada cuando el tratamiento médico no logra controlar satisfactoriamente los cuadros infecciosos bronquiales. Existe franca posibilidad de mejoría, pero no un indicador de éxito para el procedimiento quirúrgico.Aim: To analyze the results of surgical interventions due to bronchiectasias at the Thoracic Surgery Department of the Dr. R. A. Calderón Guardia Hospital. Methods: In order to review the results of 44 surgical interventions due to bronchiectasias at the Thoracic Surgery Department of Calderón Guardia Hospital, the clinical files of 36 patients were examined. Results: A significant prevalence of the disease in female patients was observed, in proportion of 11 to 1. In most cases, causal

  18. "Hall viscosity" and intrinsic metric of incompressible fractional Hall fluids

    Haldane, F. D. M.

    2009-01-01

    The (guiding-center) "Hall viscosity" is a fundamental tensor property of incompressible ``Hall fluids'' exhibiting the fractional quantum Hall effect; it determines the stress induced by a non-uniform electric field, and the intrinsic dipole moment on (unreconstructed) edges. It is characterized by a rational number and an intrinsic metric tensor that defines distances on an ``incompressibility lengthscale''. These properties do not require rotational invariance in the 2D plane. The sign of ...

  19. Hall Drag in Correlated Double Layer Quantum Hall Systems

    Yang, Kun

    1998-01-01

    We show that in the limit of zero temperature, double layer quantum Hall systems exhibit a novel phenomena called Hall drag, namely a current driven in one layer induces a voltage drop in the other layer, in the direction perpendicular to the driving current. The two-by-two Hall resistivity tensor is quantized and proportional to the ${\\bf K}$ matrix that describes the topological order of the quantum Hall state, even when the ${\\bf K}$ matrix contains a zero eigenvalue, in which case the Hal...

  20. Application of the fault tree method in reliability analysis of the A-1 reactor control and safety system

    The ''fault tree'' method and its application in the reliability analysis of the control and safety system of the A-1 nuclear power plant is described. The fault tree is a logical model involving all probable fault combinations of components and subsystems associated with the occurence of the final undesired event - the system failure. The method makes possible a quantitative and qualitative analysis of the system reliability and availability using a digital computer. The aim of the fault tree reliability analysis is to determine the distribution of reliability in the system, to find ''weak spots'' of the system considered and to define minimum repair times for the system components. (author)

  1. Weak And Strong Type Estimates for Maximal Truncations of Calder\\'on-Zygmund Operators on $ A_p$ Weighted Spaces

    Hytönen, Tuomas P; Martikainen, Henri; Orponen, Tuomas; Reguera, Maria Carmen; Sawyer, Eric T; Uriarte-Tuero, Ignacio

    2011-01-01

    For 1Calder\\'on-Zygmund operator T, we show that there is a constant C(T,P) so that we prove the sharp norm dependence on T_#, the maximal truncations of T, in both weak and strong type L^p(w) norms. Namely, for the weak type norm, T_# maps L^p(w) to weak-L^p(w) with norm at most \\|w\\|_{A_p}. And for the strong type norm, the norm estimate is \\|w\\|_{A_p}^{\\max(1, (p-1) ^{-1})}. These estimates are not improvable in the power of \\lVert w\\rVert_{A_p}. Our argument follows the outlines of the arguments of Lacey-Petermichl-Reguera (Math.\\ Ann.\\ 2010) and Hyt\\"onen-P\\'erez-Treil-Volberg (arXiv, 2010) with new ingredients, including a weak-type estimate for certain duals of T_#, and sufficient conditions for two weight inequalities in L ^{p} for T_#. Our proof does not rely upon extrapolation.

  2. CALDER - Neutrinoless double-beta decay identification in TeO$_2$ bolometers with kinetic inductance detectors

    Battistelli, E S; Calvo, M; Cardani, L; Casali, N; Castellano, M G; Colantoni, I; Coppolecchia, A; Cosmelli, C; Cruciani, A; de Bernardis, P; Di Domizio, S; D'Addabbo, A; Martinez, M; Masi, S; Pagnanini, L; Tomei, C; Vignati, M

    2015-01-01

    Next-generation experiments searching for neutrinoless double-beta decay must be sensitive to a Majorana neutrino mass as low as 10 meV. CUORE, an array of 988 TeO$_2$ bolometers being commissioned at Laboratori Nazionali del Gran Sasso in Italy, features an expected sensitivity of 50-130 meV at 90% C.L, that can be improved by removing the background from $\\alpha$ radioactivity. This is possible if, in coincidence with the heat release in a bolometer, the Cherenkov light emitted by the $\\beta$ signal is detected. The amount of light detected is so far limited to only 100 eV, requiring low-noise cryogenic light detectors. The CALDER project (Cryogenic wide-Area Light Detectors with Excellent Resolution) aims at developing a small prototype experiment consisting of TeO$_2$ bolometers coupled to new light detectors based on kinetic inductance detectors. The R&D is focused on the light detectors that could be implemented in a next-generation neutrinoless double-beta decay experiment.

  3. CALDER - Neutrinoless double-beta decay identification in TeO2 bolometers with kinetic inductance detectors

    Vignati, M.; Bellini, F.; Cardani, L.; Casali, N.; Castellano, M. G.; Colantoni, I.; Coppolecchia, A.; Cosmelli, C.; Cruciani, A.; D’Addabbo, A.; Di Domizio, S.; Martinez, M.; Tomei, C.

    2016-05-01

    Next-generation experiments searching for neutrinoless double-beta decay must be sensitive to a Majorana neutrino mass as low as 10 meV. CUORE, an array of 988 TeO2 bolometers being commissioned at Laboratori Nazionali del Gran Sasso in Italy, features an expected sensitivity of 50-130 meV at 90% C.L, that can be improved by removing the background from α radioactivity. This is possible if, in coincidence with the heat release in a bolometer, the Cherenkov light emitted by the β signal is detected. The amount of light detected is so far limited to only 100 eV, requiring low-noise cryogenic light detectors. The CALDER project (Cryogenic wide-Area Light Detectors with Excellent Resolution) aims at developing a small prototype experiment consisting of TeO2 bolometers coupled to new light detectors based on kinetic inductance detectors. The present R&D is focused on the light detectors. We present the latest results and the perspectives of the project.

  4. Magnesium Hall Thruster

    Szabo, James J.

    2015-01-01

    This Phase II project is developing a magnesium (Mg) Hall effect thruster system that would open the door for in situ resource utilization (ISRU)-based solar system exploration. Magnesium is light and easy to ionize. For a Mars- Earth transfer, the propellant mass savings with respect to a xenon Hall effect thruster (HET) system are enormous. Magnesium also can be combusted in a rocket with carbon dioxide (CO2) or water (H2O), enabling a multimode propulsion system with propellant sharing and ISRU. In the near term, CO2 and H2O would be collected in situ on Mars or the moon. In the far term, Mg itself would be collected from Martian and lunar regolith. In Phase I, an integrated, medium-power (1- to 3-kW) Mg HET system was developed and tested. Controlled, steady operation at constant voltage and power was demonstrated. Preliminary measurements indicate a specific impulse (Isp) greater than 4,000 s was achieved at a discharge potential of 400 V. The feasibility of delivering fluidized Mg powder to a medium- or high-power thruster also was demonstrated. Phase II of the project evaluated the performance of an integrated, highpower Mg Hall thruster system in a relevant space environment. Researchers improved the medium power thruster system and characterized it in detail. Researchers also designed and built a high-power (8- to 20-kW) Mg HET. A fluidized powder feed system supporting the high-power thruster was built and delivered to Busek Company, Inc.

  5. The Microwave Hall Effect

    Coppock, J. E.; Anderson, J R; Johnson, W. B.

    2015-01-01

    This paper describes a simple microwave apparatus to measure the Hall effect in semiconductor wafers. The advantage of this technique is that it does not require contacts on the sample or the use of a resonant cavity. Our method consists of placing the semiconductor wafer into a slot cut in an X-band (8 - 12 GHz) waveguide series tee, injecting microwave power into the two opposite arms of the tee, and measuring the microwave output at the third arm. A magnetic field applied perpendicular to ...

  6. RB research reactor Safety Report

    This RB reactor safety report is a revised and improved version of the Safety report written in 1962. It contains descriptions of: reactor building, reactor hall, control room, laboratories, reactor components, reactor control system, heavy water loop, neutron source, safety system, dosimetry system, alarm system, neutron converter, experimental channels. Safety aspects of the reactor operation include analyses of accident causes, errors during operation, measures for preventing uncontrolled activity changes, analysis of the maximum possible accident in case of different core configurations with natural uranium, slightly and highly enriched fuel; influence of possible seismic events

  7. Topological Orbital Angular Momentum Hall Current

    Hu, Jiangping

    2005-01-01

    We show that there is a fundamental difference between spin Hall current and orbital angular momentum Hall current in Rashba- Dresselhaus spin orbit coupling systems. The orbital angular momentum Hall current has a pure topological contribution which is originated from the existence of magnetic flux in momentum space while there is no such topological nature for the spin Hall current. Moreover, we show that the orbital Hall conductance is always larger than the spin Hall conductance in the pr...

  8. The ISOLDE hall

    Maximilien Brice

    2002-01-01

    Since 1992, after its move from the 600 MeV SC, ISOLDE is a customer of the Booster (then 1 GeV, now 1.4 GeV). The intense Booster beam (some 3E13 protons per pulse) is directed onto a target, from which a mixture of isotopes emanates. After ionization and electrostatic acceleration to 60 keV, they enter one of the 2 spectrometers (General Purpose Separator: GPS, and High Resolution Separator: HRS) from which the selected ions are directed to the experiments. The photos show: the REX-ISOLDE post accelerator; the mini-ball experiment; an overview of the ISOLDE hall. In the picture (_12) of the hall, the separators are behind the wall. From either of them, beams can be directed into any of the many beamlines towards the experiments, some of which are visible in the foreground. The elevated cubicle at the left is EBIS (Electron Beam Ion Source), which acts as a charge-state multiplier for the REX facility. The ions are further mass analzyzed and passed on to the linac which accelerates them to higher energies. T...

  9. A non-invasive Hall current distribution measurement system for Hall Effect thrusters

    Mullins, Carl Raymond

    A direct, accurate method to measure thrust produced by a Hall Effect thruster on orbit does not currently exist. The ability to calculate produced thrust will enable timely and precise maneuvering of spacecraft---a capability particularly important to satellite formation flying. The means to determine thrust directly is achievable by remotely measuring the magnetic field of the thruster and solving the inverse magnetostatic problem for the Hall current density distribution. For this thesis, the magnetic field was measured by employing an array of eight tunneling magnetoresistive (TMR) sensors capable of milligauss sensitivity when placed in a high background field. The array was positioned outside the channel of a 1.5 kW Colorado State University Hall thruster equipped with a center-mounted electride cathode. In this location, the static magnetic field is approximately 30 Gauss, which is within the linear operating range of the TMR sensors. Furthermore, the induced field at this distance is greater than tens of milligauss, which is within the sensitivity range of the TMR sensors. Due to the nature of the inverse problem, the induced-field measurements do not provide the Hall current density by a simple inversion; however, a Tikhonov regularization of the induced field along with a non-negativity constraint and a zero boundary condition provides current density distributions. Our system measures the sensor outputs at 2 MHz allowing the determination of the Hall current density distribution as a function of time. These data are shown in contour plots in sequential frames. The measured ratios between the average Hall current and the discharge current ranged from 0.1 to 10 over a range of operating conditions from 1.3 kW to 2.2 kW. The temporal inverse solution at 2.0 kW exhibited a breathing mode of 37 kHz, which was in agreement with temporal measurements of the discharge current.

  10. Residence Hall Seating That Works.

    Wiens, Janet

    2003-01-01

    Describes the seating chosen for residence halls at the Massachusetts Institute of Technology and the University of New England. The seating required depends on ergonomics, aesthetics, durability, cost, and code requirements. In addition, residence halls must have a range of seating types to accommodate various uses. (SLD)

  11. Hall Effect in spinor condensates

    Taillefumier, Mathieu; Dahl, Eskil K.; Brataas, Arne; Hofstetter, Walter

    2009-01-01

    We consider a neutral spinor condensate moving in a periodic magnetic field. The spatially dependent magnetic field induces an effective spin dependent Lorentz force which in turn gives rise to a spin dependent Hall effect. Simulations of the Gross-Pitaevskii equation quantify the Hall effect. We discuss possible experimental realizations.

  12. NPS Alumni Hall of Fame

    2013-01-01

    Lists NPS Alumni Hall of Fame awardees. "The NPS Hall of Fame recognizes the accomplishments of NPS's most distinguished alumni and friends who, through the attainment of positions at the highest levels of public service, have made the greatest contributions to society, their nations and to the Naval Postgraduate School. "

  13. Pericarditis y Pericardiectomía: Experiencia en el Hospital R. A. Calderón Guardia, 2003-2010

    Eric Rubí Chacón

    2011-12-01

    Full Text Available Introducción. La pericarditis puede presentarse como un derrame pericárdico o como constricción pericárdica y en un pequeño porcentaje de pacientes, ocurren ambos. Las causas son variadas y en ocasiones, la resolución es quirúrgica. El propósito de este reporte es mostrar la experiencia quirúrgica acumulada en nuestro centro durante los últimos 7 años. Métodos. Se revisaron los expedientes clínicos de todos los pacientes a quienes se les practicó una intervención pericárdica primaria por derrame pericárdico o pericarditis constrictiva en el Hospital Rafael A. Calderón Guardia en San José, Costa Rica, desde octubre de 2003 a setiembre de 2010. Se excluyeron aquellos individuos con derrame pericárdico secundario a sobreanticoagulación, cirugía cardiaca reciente, trauma torácico o trasudados secundarios a patología sistémica. Resultados. Se incluyeron 19 pacientes, 11 hombres y 8 mujeres, 16 con derrame pericárdico y 3 con pericarditis constrictiva. Treinta y siete por ciento de los pacientes tuvieron cuadros de pericarditis inespecífica, 32% tenían una pericarditis infecciosa, y 26% tuvieron pericarditis de origen neoplásico, 1 tuvo una pericarditis quilosa. Tres enfermos eran portadores de virus de inmunodeficiencia humana, 2 con pericarditis tuberculosa y 1 con pericarditis inespecífica. En general los pacientes con derrame hemodinámicamente importante fueron abordados mediante ventana subxifoidea y en los casos de constricción se utilizó pericardiectomía. Solo un paciente falleció en esta serie, por síndrome de bajo gasto postoperatorio. Conclusión. Se revisa el manejo clínico, quirúrgico y anestésico de estos enfermos y se analiza el síndrome de bajo gasto, que puede ocurrir en algunos de ellos al drenar el líquido o al descomprimir el corazónIntroduction. Pericarditis may present with a pericardial effusion of variable size, inflammation alone or constrictive pericarditis. In a small percentage of

  14. La identidad nacional y Calderón en la polémica teatral de 1762-1764

    Bezhanova, Olga

    2004-06-01

    Full Text Available Drawing on contemporary theories about national identity, legitimacy and intellectual authority this article explores identitarian issues at stake during the 1762-1764 controversy on Spanish theater. Re-reading texts by Clavijo y Fajardo (El Pensador, Nicolás Fernández de Moratín (Desengaños al teatro español and other writings, Mariano José Nipho (Diario Estrangero and La nación española defendida and José Romea y Tapia (El escritor sin título we contend that what these authors are debating indeed is not theater but the legitimacy and authority they are claiming for, and ultimately opposing conceptions of national identity. Calderón becoming a cultural icon of such identity. Particularly significant is the role of autos sacramentales in this context. In effect, acrimony and irritation are part of this polemics because orthodox Catholicism is, from a conservative point of view, an essential component of what they consider Spanish national identity. The prohibition of the autos is just a sign of a temporary change in the relationship of forces.A partir de teorías actuales sobre la identidad nacional, la legitimidad y la autoridad intelectual, este artículo explora los puntos clave identitarios que se ponen en juego durante la polémica sobre el teatro español de los años 1762-1764. Mediante una re-lectura de los textos de Clavijo y Fajardo (El Pensador, Nicolás Fernández de Moratín (Desengaños al teatro español y otros escritos, Mariano José Nipho (Diario Estrangero y La nación española defendida y José Romea y Tapia (El escritor sin título, sostenemos que lo que estos autores discuten realmente no es sobre el teatro, sino sobre la legitimidad y autoridad que reclaman, y en último término concepciones enfrentadas sobre la identidad nacional, de la que Calderón parece convertirse en icono cultural. De particular significación es el papel de los autos sacramentales en este contexto. En efecto, la acritud y la irritaci

  15. Funciones del sueño en un auto de Calderón: Sueños hay que verdad son (1670)

    Gilbert, Françoise

    2005-01-01

    International audience SUMMARY:This study seeks to analyze the different functions of dream in the auto of Calderón, Sueños hay que verdad son (1670), which is based on some episodes from Josef's life in Genesis. Beginning with the structuring function of dream, in Bible stories, I study the dramatic function of this motif in this auto, within the sacramental frame of a double reading: historial and allegorical. After first establishing the structure of the work based on its metrical organ...

  16. High-order Div- and Quasi Curl-Conforming Basis Functions for Calderón Multiplicative Preconditioning of the EFIE

    Valdes, Felipe

    2011-04-01

    A new high-order Calderón multiplicative preconditioner (HO-CMP) for the electric field integral equation (EFIE) is presented. In contrast to previous CMPs, the proposed preconditioner allows for high-order surface representations and current expansions by using a novel set of high-order quasi curl-conforming basis functions. Like its predecessors, the HO-CMP can be seamlessly integrated into existing EFIE codes. Numerical results demonstrate that the linear systems of equations obtained using the proposed HO-CMP converge rapidly, regardless of the mesh density and of the order of the current expansion. © 2006 IEEE.

  17. Irradiation tests of ITER candidate Hall sensors using two types of neutron spectra

    We report on irradiation tests of InSb based Hall sensors at two irradiation facilities with two distinct types of neutron spectra. One was a fission reactor neutron spectrum with a significant presence of thermal neutrons, while another one was purely fast neutron field. Total neutron fluence of the order of 1016 cm-2 was accumulated in both cases, leading to significant drop of Hall sensor sensitivity in case of fission reactor spectrum, while stable performance was observed at purely fast neutron spectrum. This finding suggests that performance of this particular type of Hall sensors is governed dominantly by transmutation. Additionally, it further stresses the need to test ITER candidate Hall sensors under neutron flux with ITER relevant spectrum.

  18. Farm Hall: The Play

    Cassidy, David C.

    2013-03-01

    It's July 1945. Germany is in defeat and the atomic bombs are on their way to Japan. Under the direction of Samuel Goudsmit, the Allies are holding some of the top German nuclear scientists-among them Heisenberg, Hahn, and Gerlach-captive in Farm Hall, an English country manor near Cambridge, England. As secret microphones record their conversations, the scientists are unaware of why they are being held or for how long. Thinking themselves far ahead of the Allies, how will they react to the news of the atomic bombs? How will these famous scientists explain to themselves and to the world their failure to achieve even a chain reaction? How will they come to terms with the horror of the Third Reich, their work for such a regime, and their behavior during that period? This one-act play is based upon the transcripts of their conversations as well as the author's historical work on the subject.

  19. Towards Hall effect spintronics

    Major efforts in the current exploration of spintronics are focused on the giant magnetoresistance (GMR) phenomenon in metallic, semiconducting and tunnel junction magnetic heterostructures. I wish to present a different approach based on the extraordinary Hall effect (EHE). Since its discovery more than a century ago, the EHE was not considered seriously for technological applications because of its relatively small value in bulk magnetic materials. Several techniques were recently developed to significantly enhance the effect. Field sensitivity of tens to hundreds Ω/T has been obtained. We argue that EHE-based sensors and memory devices promise a number of valuable advantages, including high sensitivity, thermal stability and simplicity and low cost manufacture, and can become an alternative to the GMR

  20. City and Town Halls; townHalls13

    University of Rhode Island Geospatial Extension Program — Locations of city and town halls in Rhode Island. Derived using information originally compiled by the State of Rhode Island (http://www.ri.gov), and built upon...

  1. Tuning giant anomalous Hall resistance ratio in perpendicular Hall balance

    Zhang, J. Y.; Yang, G. [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China); State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Wang, S. G., E-mail: sgwang@iphy.ac.cn, E-mail: ghyu@mater.ustb.edu.cn [State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Liu, J. L. [State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China); Wang, R. M. [Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China); Amsellem, E.; Kohn, A. [Department of Materials Engineering, Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel); Yu, G. H., E-mail: sgwang@iphy.ac.cn, E-mail: ghyu@mater.ustb.edu.cn [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China)

    2015-04-13

    Anomalous Hall effect at room temperature in perpendicular Hall balance with a core structure of [Pt/Co]{sub 4}/NiO/[Co/Pt]{sub 4} has been tuned by functional CoO layers, where [Pt/Co]{sub 4} multilayers exhibit perpendicular magnetic anisotropy. A giant Hall resistance ratio up to 69 900% and saturation Hall resistance (R{sub S}{sup P}) up to 2590 mΩ were obtained in CoO/[Pt/Co]{sub 4}/NiO/[Co/Pt]{sub 4}/CoO system, which is 302% and 146% larger than that in the structure without CoO layers, respectively. Transmission electron microscopy shows highly textured [Co/Pt]{sub 4} multilayers and oxide layers with local epitaxial relations, indicating that the crystallographic structure has significant influence on spin dependent transport properties.

  2. Tuning giant anomalous Hall resistance ratio in perpendicular Hall balance

    Anomalous Hall effect at room temperature in perpendicular Hall balance with a core structure of [Pt/Co]4/NiO/[Co/Pt]4 has been tuned by functional CoO layers, where [Pt/Co]4 multilayers exhibit perpendicular magnetic anisotropy. A giant Hall resistance ratio up to 69 900% and saturation Hall resistance (RSP) up to 2590 mΩ were obtained in CoO/[Pt/Co]4/NiO/[Co/Pt]4/CoO system, which is 302% and 146% larger than that in the structure without CoO layers, respectively. Transmission electron microscopy shows highly textured [Co/Pt]4 multilayers and oxide layers with local epitaxial relations, indicating that the crystallographic structure has significant influence on spin dependent transport properties

  3. Ward Identities for Hall Transport

    Hoyos, Carlos; Oz, Yaron

    2014-01-01

    We derive quantum field theory Ward identities based on linear area preserving and conformal transformations in 2+1 dimensions. The identities relate Hall viscosities, Hall conductivities and the angular momentum. They apply both for relativistic and non relativistic systems, at zero and at finite temperature. We consider systems with or without translation invariance, and introduce an external magnetic field and viscous drag terms. A special case of the identities yields the well known relation between the Hall conductivity and half the angular momentum density.

  4. Multilayer thin film Hall effect device

    Peters, Palmer N. (Inventor); Sisk, R. Charles (Inventor)

    1994-01-01

    A Hall effect device and a method of obtaining a magnetic field map of a magnetic body with the Hall effect device are presented. The device comprises: (1) a substrate, (2) a first layer having a first Hall coefficient deposited over the substrate, and (3) a second layer having a second Hall coefficient deposited over the first layer, the first and second layers cooperating to create, in the Hall effect device, a third Hall coefficient different from the first and second Hall coefficients. Creation of the third Hall coefficient by cooperation of the first and second layers allows use of materials for the first and second layers that were previously unavailable for Hall effect devices due to their relatively weak Hall coefficient.

  5. Descripción y análisis de capas superpuestas en El castillo de Lindabridis de Calderón

    Escudero Baztán, Juan Manuel

    2015-06-01

    Full Text Available This paper describes and analyzes the highlights of a play El castillo de Lindabridis of Calderón de la Barca: topics relating to the date of his writing and his performances in the seventeenth century, the management of chivalric sources, the unitary structure, the use of emblematic material through the medieval bestiaries, musical interludes, and the staging and the repetition of themes and motifs, along with some final considerations about gender. All these factors indicate the particular importance of this comedy of Calderón.Este trabajo describe y analiza los puntos más relevantes de una obra caballeresca calderoniana poco conocida como El castillo de Lindabridis: cuestiones relativas a la fecha de su escritura y sus representaciones en el siglo XVII, al manejo de las fuentes caballerescas, a la estructura unitaria, al uso de la emblemática a través de los bestiarios medievales, a los interludios musicales, a la escenificación y la repetición de temas y motivos, junto a unas consideraciones finales sobre el género. Elementos en su conjunto que indican la particular relevancia de esta comedia de gran espectáculo calderoniana.

  6. Shared Magnetics Hall Thruster Project

    National Aeronautics and Space Administration — In the proposed Phase II program, Busek Co. will demonstrate an innovative methodology for clustering Hall thrusters into a high performance, very high power...

  7. Shared Magnetics Hall Thruster Project

    National Aeronautics and Space Administration — In the proposed Phase I program, Busek Co. will demonstrate an innovative methodology for clustering Hall thrusters into a high performance, very high power...

  8. "Hall mees" Linnateatris / Triin Sinissaar

    Sinissaar, Triin

    1999-01-01

    Tallinn Linnateatri ja Raadioteatri ühislavastus "Hall mees" Gill Adamsi näidendi järgi, lavastaja Eero Spriit, osades Helene Vannari ja Väino Laes, kunstnik Kustav - Agu Püüman. Esietendus 22. okt

  9. General footage ISOLDE experimental hall HD

    2016-01-01

    Overview of the ISOLDE experimental hall. Equipment and experiments. Taken from the WITCH / EBIS platform: ISOLDE hall infrastructure, GHM line, LA1, LA2, LA0, central beamline, COLLAPS experiment, CRIS experiment, ISOLTRAP experiment, laser guidance from building 508 into the hall for laser spectroscopy COLLAPS and CRIS. Taken from the HIE ISOLDE shielding tunnel roof: ISOLDE hall infrastructure, WITCH experiment, VITO line, TAS experiment. General footage: High Tension room entrance and EBIS platform, staircases and passages in the experimental hall.

  10. Theory of spin Hall effect

    Chudnovsky, Eugene M.

    2007-01-01

    An extension of Drude model is proposed that accounts for spin and spin-orbit interaction of charge carriers. Spin currents appear due to combined action of the external electric field, crystal field and scattering of charge carriers. The expression for spin Hall conductivity is derived for metals and semiconductors that is independent of the scattering mechanism. In cubic metals, spin Hall conductivity $\\sigma_s$ and charge conductivity $\\sigma_c$ are related through $\\sigma_s = [2 \\pi \\hbar...

  11. Duality Near Quantum Hall Transitions

    Shimshoni, E.; Sondhi, S. L.; Shahar, D.

    1996-01-01

    A recent experiment by Shahar et al, on the phase transitions between quantum Hall states and the insulator, found that the current-voltage characteristics in the two phases are related by symmetry. It was suggested in this work that this is evidence for charge-flux duality near quantum Hall transitions. Here we provide details of this analysis. (Appearances notwithstanding, this is a theoretical paper.)

  12. Multiprobe quantum spin Hall bars

    Sanvito, Stefano

    2013-01-01

    PUBLISHED We analyze electron transport in multiprobe quantum spin Hall (QSH) bars using the B¨uttiker formalism and draw parallels with their quantum Hall (QH) counterparts. We find that in a QSH bar the measured resistance changes upon introducing side voltage probes, in contrast to the QH case. We also study four- and six-terminal geometries and derive the expressions for the resistances. For these our analysis is generalized from the single-channel to the multi-channel case...

  13. Optimization of Cylindrical Hall Thrusters

    The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiation, and stable operation.

  14. Sheldon-Hall syndrome

    Bamshad Michael J

    2009-03-01

    Full Text Available Abstract Sheldon-Hall syndrome (SHS is a rare multiple congenital contracture syndrome characterized by contractures of the distal joints of the limbs, triangular face, downslanting palpebral fissures, small mouth, and high arched palate. Epidemiological data for the prevalence of SHS are not available, but less than 100 cases have been reported in the literature. Other common clinical features of SHS include prominent nasolabial folds, high arched palate, attached earlobes, mild cervical webbing, short stature, severe camptodactyly, ulnar deviation, and vertical talus and/or talipes equinovarus. Typically, the contractures are most severe at birth and non-progressive. SHS is inherited in an autosomal dominant pattern but about half the cases are sporadic. Mutations in either MYH3, TNNI2, or TNNT3 have been found in about 50% of cases. These genes encode proteins of the contractile apparatus of fast twitch skeletal muscle fibers. The diagnosis of SHS is based on clinical criteria. Mutation analysis is useful to distinguish SHS from arthrogryposis syndromes with similar features (e.g. distal arthrogryposis 1 and Freeman-Sheldon syndrome. Prenatal diagnosis by ultrasonography is feasible at 18–24 weeks of gestation. If the family history is positive and the mutation is known in the family, prenatal molecular genetic diagnosis is possible. There is no specific therapy for SHS. However, patients benefit from early intervention with occupational and physical therapy, serial casting, and/or surgery. Life expectancy and cognitive abilities are normal.

  15. Iodine Hall Thruster

    Szabo, James

    2015-01-01

    Iodine enables dramatic mass and cost savings for lunar and Mars cargo missions, including Earth escape and near-Earth space maneuvers. The demonstrated throttling ability of iodine is important for a singular thruster that might be called upon to propel a spacecraft from Earth to Mars or Venus. The ability to throttle efficiently is even more important for missions beyond Mars. In the Phase I project, Busek Company, Inc., tested an existing Hall thruster, the BHT-8000, on iodine propellant. The thruster was fed by a high-flow iodine feed system and supported by an existing Busek hollow cathode flowing xenon gas. The Phase I propellant feed system was evolved from a previously demonstrated laboratory feed system. Throttling of the thruster between 2 and 11 kW at 200 to 600 V was demonstrated. Testing showed that the efficiency of iodine fueled BHT-8000 is the same as with xenon, with iodine delivering a slightly higher thrust-to-power (T/P) ratio. In Phase II, a complete iodine-fueled system was developed, including the thruster, hollow cathode, and iodine propellant feed system. The nominal power of the Phase II system is 8 kW; however, it can be deeply throttled as well as clustered to much higher power levels. The technology also can be scaled to greater than 100 kW per thruster to support megawatt-class missions. The target thruster efficiency for the full-scale system is 65 percent at high specific impulse (Isp) (approximately 3,000 s) and 60 percent at high thrust (Isp approximately 2,000 s).

  16. Service hall in Number 1 Fukushima Nuclear Power Station, Tokyo Electric Power Company, Inc

    There are six BWR type nuclear power plants in the Number 1 Fukushima Nuclear Power Station, Tokyo Electric Power Company, Inc. The service hall of the station is located near the entrance of the station. In the center of this service hall, there is the model of a nuclear reactor of full scale. This mock-up shows the core region in the reactor pressure vessel for the number one plant. The diameter and the thickness of the pressure vessel are about 5 m and 16 cm, respectively. The fuel assemblies and control rods are set just like the actual reactor, and the start-up operation of the reactor is shown colorfully and dynamically by pushing a button. When the control rods are pulled out, the boiling of water is demonstrated. The 1/50 scale model of the sixth plant with the power generating capacity of 1100 MWe is set, and this model is linked to the mock-up of reactor written above. The operations of a recirculating loop, a turbine and a condenser are shown by switching on and off lamps. The other exhibitions are shielding concrete wall, ECCS model, and many kinds of panels and models. This service hall is incorporated in the course of study and observation of civics. The good environmental effects to fishes and shells are explained in this service hall. Official buildings and schools are built near the service hall utilizing the tax and grant concerning power generation. This service hall contributes to give much freedom from anxiety to the public by the tour. (Nakai, Y.)

  17. Backfitting of the FRG reactors

    The FRG-research reactors The GKSS-research centre is operating two research reactors of the pool type fueled with MTR-type type fuel elements. The research reactors FRG-1 and FRG-2 having power levels of 5 MW and 15 MW are in operation for 31 year and 27 years respectively. They are comparably old like other research reactors. The reactors are operating at present at approximately 180 days (FRG-1) and between 210 and 250 days (FRG-2) per year. Both reactors are located in the same reactor hall in a connecting pool system. Backfitting measures are needed for our and other research reactors to ensure a high level of safety and availability. The main backfitting activities during last ten years were concerned with: comparison of the existing design with today demands (criteria, guidelines, standards etc.); and probability approach for events from outside like aeroplane crashes and earthquakes; the main accidents were rediscussed like startup from low and full power, loss of coolant flow, loss of heat sink, loss of coolant and fuel plate melting; a new reactor protection system had to be installed, following today's demands; a new crane has been installed in the reactor hall. A cold neutron source has been installed to increase the flux of cold neutrons by a factor of 14. The FRG-l is being converted from 93% enriched U with Alx fuel to 20% enriched U with U3Si2 fuel. Both cooling towers were repaired. Replacement of instrumentation is planned

  18. Hall mobility in multicrystalline silicon

    Schindler, F.; Geilker, J.; Kwapil, W.; Warta, W.; Schubert, M. C.

    2011-08-01

    Knowledge of the carrier mobility in silicon is of utmost importance for photovoltaic applications, as it directly influences the diffusion length and thereby the cell efficiency. Moreover, its value is needed for a correct quantitative evaluation of a variety of lifetime measurements. However, models that describe the carrier mobility in silicon are based on theoretical calculations or fits to experimental data in monocrystalline silicon. Multicrystalline (mc) silicon features crystal defects such as dislocations and grain boundaries, with the latter possibly leading to potential barriers through the trapping of charge carriers and thereby influencing the mobility, as shown, for example, by Maruska et al. [Appl. Phys. Lett. 36, 381 (1980)]. To quantify the mobilities in multicrystalline silicon, we performed Hall measurements in p-type mc-Si samples of various resistivities and different crystal structures and compared the data to majority carrier Hall mobilities in p-type monocrystalline floatzone (FZ) silicon. For lack of a model that provides reliable values of the Hall mobility in silicon, an empirical fit similar to existing models for conductivity mobilities is proposed based on Hall measurements of monocrystalline p-type FZ silicon. By comparing the measured Hall mobilities obtained from mc silicon with the corresponding Hall mobilities in monocrystalline silicon of the same resistivity, we found that the mobility reduction due to the presence of crystal defects in mc-Si ranges between 0% and 5% only. Mobility decreases of up to 30% as reported by Peter et al. [Proceedings of the 23rd European Photovoltaic Solar Energy Conference, Valencia, Spain, 1-5 September 2008], or even of a factor of 2 to 3 as detected by Palais et al. [Mater. Sci. Eng. B 102, 184 (2003)], in multicrystalline silicon were not observed.

  19. High Performance Power Module for Hall Effect Thrusters

    Pinero, Luis R.; Peterson, Peter Y.; Bowers, Glen E.

    2002-01-01

    Previous efforts to develop power electronics for Hall thruster systems have targeted the 1 to 5 kW power range and an output voltage of approximately 300 V. New Hall thrusters are being developed for higher power, higher specific impulse, and multi-mode operation. These thrusters require up to 50 kW of power and a discharge voltage in excess of 600 V. Modular power supplies can process more power with higher efficiency at the expense of complexity. A 1 kW discharge power module was designed, built and integrated with a Hall thruster. The breadboard module has a power conversion efficiency in excess of 96 percent and weighs only 0.765 kg. This module will be used to develop a kW, multi-kW, and high voltage power processors.

  20. Análisis de los factores de riesgo de prematuridad en el Hospital Calderón Guardia de enero a agosto 2001

    Bernardo Goldstein Sandoval

    2003-03-01

    Full Text Available En esta investigación se plantea los factores asociados al riesgo de prematuridad que incide notablemente en la salud pública costarricense. El objetivo general del estudio es: Analizar los factores de riesgo de prematuridad en el Hospital Calderón Guardia de enero a agosto 2001 mediante un modelo de Regresión Logística. Para lograr este propósito se determinaron los factores que presentan asociación significativa con el parto prematuro y se cuantificó el grado de asociación entre factores de riesgo y parto de pretérmino. Métodos: Este es un estudio retrospectivo que analiza expedientes médicos de pacientes embarazadas que tuvieron su parto en el Hospital Calderón Guardia de enero a agosto 2001. A una muestra representativa de un total de 5061 expedientes del Servicio de Obstetricia del Hospital Calderón Guardia, en relación con nacimientos ocurridos de enero a agosto 2001 se les aplicó una revisión general, con el propósito básico de identificar factores de riesgo asociados con prematuridad. Para lograr lo anterior se tomó una muestra de expedientes estadísticamente significativa. El total de expedientes es de 5061 y el tamaño de la muestra es de 291, con un nivel de confianza de un 95% y con un error máximo permisible de un 5%. Resultados: El 43% de la muestra de partos (290 partos de 5061 ocurridos entre enero y agosto de 2001 en el Hospital Calderón Guardia corresponden a prematuros (casos y el 57% restantes son de término (controles. La anterior muestra se relaciona con un nivel de confianza del 95%. El modelo de Regresión Logística obtenido se puede representar mediante el logit: _(x= 2,5022 - 0,0241DS - 0,283CP + 3,077PREPREM + 2,206 HTAPRE + 0,649 HTAIE + 1,355 RPM + 3,174 GEMELOS Los valores estimados de los coeficientes b no pueden interpretarse directamente como probabilidades, sino como variaciones en el índice estimado de propensión (score. Las variables que resultaron estadísticamente significativas al

  1. Proyecto de remodelación de la calle Francesc Macià, entre avenida Calderó y la calle Àngel Guimerà

    Viñals Burgo, Enrique

    2011-01-01

    El Ayuntamiento de Mollet del Vallés, cree oportuna la remodelación de la calle Francesc Macià, entre avenida Calderó y la calle Àngel Guimerà y convertirla en una calle peatonal. Es una calle que sirve de conexión entre el centro de la población y la estación de Renfe Mollet – St. Fost, cuya única parte no peatonal, es la que se va a proyectar. Además en esta calle se encuentra el colegio público Nicolás Longarón, cuya entrada principal, se da por esta misma calle a remodelar....

  2. El tratamiento de la historia contemporánea en El sitio de Bredá, comedia de Calderón

    González Martínez, Lola

    2015-01-01

    Sin poder establecer con detalle el estado de la cuestión sobre la temprana obra de Calderón, El sitio de Bredá, diré que no es hasta mediados del siglo pasado que mereció debida atención por parte de la hispanista holandesa Johanna R. Schrek. Hasta ese momento, la edición vio la luz en 1957, la crítica, tanto española como extranjera, había prestado una atención muy superficial a la obra y había emitido un juicio poco favorable de ella. Así, por ejemplo, don Marcelino Menéndez Pelayo calific...

  3. Bound values for Hall conductivity of heterogeneous medium under quantum Hall effect conditions

    V E Arkhincheev

    2008-02-01

    Bound values for Hall conductivity under quantum Hall effect (QHE) conditions in inhomogeneous medium has been studied. It is shown that bound values for Hall conductivity differ from bound values for metallic conductivity. This is due to the unusual character of current percolation under quantum Hall effect conditions.

  4. Performance of metal Hall sensors based on copper

    Sentkerestiová, J.; Ďuran, Ivan; Kovařík, Karel; Viererbl, L.; Kohout, Michal

    2013-01-01

    Roč. 88, 6-8 (2013), s. 1310-1314. ISSN 0920-3796. [Symposium on Fusion Technology (SOFT-27)/27./. Liège, 24.09.2012-28.09.2012] R&D Projects: GA MŠk 7G10072; GA MŠk(CZ) LM2011021 Grant ostatní: EUROATOM(XE) FU07-CT-2007-00060 Institutional support: RVO:61389021 ; RVO:68378271 Keywords : Metal Hall sensor * Magnetic diagnostics * Copper Hall sensor * Fusion reactors * Neutron irradiation Subject RIV: BL - Plasma and Gas Discharge Physics; BM - Solid Matter Physics ; Magnetism (FZU-D) Impact factor: 1.149, year: 2013 http://www.sciencedirect.com/science/article/pii/S0920379613001701#

  5. New insight into the Hall effect

    Huang, X. Q.

    2009-01-01

    In this paper, we develop a unified theory for describing Hall effect in various electronic systems based on a pure electron picture (without the hole concept). We argue that the Hall effect is the magnetic field induced symmetry breaking of the charge carrier's spatial distribution. Due to the interaction of the charge carriers and the ion lattice, there are two possible symmetry breaking mechanisms which cause different signs of Hall coefficient in a Hall material. The scenario provides an ...

  6. Hall probes: physics and application to magnetometry

    Sanfilippo, S.

    2011-01-01

    This lecture aims to present an overview of the properties of Hall effect devices. Descriptions of the Hall phenomenon, a review of the Hall effect device characteristics and of the various types of probes are presented. Particular attention is paid to the recent development of three-axis sensors and the related techniques to cancel the offsets and the planar Hall effect. The lecture introduces the delicate problem of the calibration of a three-dimensional sensor and ends with a section devot...

  7. Spin Hall Effect in Noncommutative Coordinates

    Dayi, O. F.; Elbistan, M.

    2008-01-01

    A semiclassical constrained Hamiltonian system which was established to study dynamical systems of matrix valued non-Abelian gauge fields is employed to formulate spin Hall effect in noncommuting coordinates at the first order in the constant noncommutativity parameter theta . The method is first illustrated by studying the Hall effect on the noncommutative plane in a gauge independent fashion. Then, the Drude model type and the Hall effect type formulations of spin Hall effect are considered...

  8. Topological Nature of the Phonon Hall Effect

    Zhang, Lifa; Ren, Jie; Wang, Jian-Sheng; Li, Baowen

    2010-01-01

    We provide a topological understanding on phonon Hall effect in dielectrics with Raman spinphonon coupling. A general expression for phonon Hall conductivity is obtained in terms of the Berry curvature of band structures. We find a nonmonotonic behavior of phonon Hall conductivity as a function of magnetic field. Moreover, we observe a phase transition in phonon Hall effect, which corresponds to the sudden change of band topology, characterized by the altering of integer Chern numbers. This c...

  9. A Gift for Reading Hall No. 1

    MacWilliams, Bryon

    2009-01-01

    In this article, the author describes Reading Hall No. 1 of the Russian State Library. He was placed in the first reading hall in the mid-1990s, when the Russian government still honored Soviet traditions of granting certain privileges to certain foreigners. In the first hall, the rules are different. He can request as many books as he wants. He…

  10. The Other Hall Effect: College Board Physics

    Sheppard, Keith; Gunning, Amanda M.

    2013-01-01

    Edwin Herbert Hall (1855-1938), discoverer of the Hall effect, was one of the first winners of the AAPT Oersted Medal for his contributions to the teaching of physics. While Hall's role in establishing laboratory work in high schools is widely acknowledged, his position as chair of the physics section of the Committee on College Entrance…

  11. Phase Diagram of Integer Quantum Hall Effect

    Sheng, D. N.; Weng, Z. Y.

    1999-01-01

    The phase diagram of integer quantum Hall effect is numerically determined in the tight-binding model, which can account for overall features of recently obtained experimental phase diagram. In particular, the quantum Hall plateaus are terminated by two distinct insulating phases, characterized by the Hall resistance with classic and quantized values, respectively, which is also in good agreement with experiments.

  12. Hall effect in NS and SNS junctions

    Zhou, F.; Spivak, B.

    1997-01-01

    Hall effect in SN and SNS junctions is considered. It is shown that at small temperature the Hall voltage is significantly suppressed as compared to its normal metal value. The time dependence of the Hall voltage in SNS junctions has a form of narrow pulses with the Josephson frequency.

  13. Hall / Madle Mühlbach

    Mühlbach, Madle

    2008-01-01

    Hallist värvusest interjööris, olles oma passiivsuses ja lakoonilisuses nii efektne, kui seda ilmestab mõni värvikam detail või neutraalne tasakaalustaja. Lk. 73 Eva Toome valitud halle esemeid müügivõrgust

  14. ATLAS Assembly Hall Open Day

    Patrice Loiez

    2004-01-01

    To mark the 50th Anniversary of the founding of CERN, a day of tours, displays and presentations was held in October 2004. The assembly halls for the experiments that were waiting to be installed on the LHC, such as ATLAS shown here, were transformed into display areas and cafés.

  15. NPS Hall of Fame 2015

    Naval Postgraduate School (U.S.)

    2015-01-01

    "The NPS Hall of Fame recognizes the accomplishments of NPS's most distinguished alumni and friends who, through the attainment of positions at the highest levels of public service, have made the greatest contributions to society, their nations and to the Naval Postgraduate School. "

  16. Quantum-Hall quantum bits

    Yang, S. -R. Eric; Schliemann, John; MacDonald, A. H.

    2002-01-01

    Bilayer quantum Hall systems can form collective states in which electrons exhibit spontaneous interlayer phase coherence. We discuss the possibility of using bilayer quantum dot many-electron states with this property to create two-level systems that have potential advantages as quantum bits.

  17. 75 FR 7467 - Gary E. Hall and Rita C. Hall; Notice of Application Accepted for Filing With the Commision...

    2010-02-19

    ... Energy Regulatory Commission Gary E. Hall and Rita C. Hall; Notice of Application Accepted for Filing.... Applicant: Gary E. Hall and Rita C. Hall. e. Name of Project: Potter Creek Hydroelectric Project. f...: Mr. Gary E. Hall and Ms. Rita C. Hall, P.O. Box 133, Olney, MT 59927, (406) 881-2345. i. FERC...

  18. On The Quantum Theory of Hall Effect

    Ghaboussi, F.

    1996-01-01

    We discuss a model of both classical and integer quantum Hall-effect which is based on a semi-classical Schroedinger-Chern-Simons-action, where the Ohm-equations result as equations of motion. The quantization of the classical Chern-Simons-part of action under typical quantum Hall conditions results in the quantized Hall conductivity. We show further that the classical Hall-effect is described by a theory which arises as the classical limit of a theory of quantum Hall-effect. The model explai...

  19. Planar Hall effect bridge magnetic field sensors

    Henriksen, A.D.; Dalslet, Bjarke Thomas; Skieller, D.H.;

    2010-01-01

    Until now, the planar Hall effect has been studied in samples with cross-shaped Hall geometry. We demonstrate theoretically and experimentally that the planar Hall effect can be observed for an exchange-biased ferromagnetic material in a Wheatstone bridge topology and that the sensor signal can...... be significantly enhanced by a geometric factor. For the samples in the present study, we demonstrate an enhancement of the sensor output by a factor of about 100 compared to cross-shaped sensors. The presented construction opens a new design and application area of the planar Hall effect, which we term planar...... Hall effect bridge sensors....

  20. Optical Hall effect-model description: tutorial.

    Schubert, Mathias; Kühne, Philipp; Darakchieva, Vanya; Hofmann, Tino

    2016-08-01

    The optical Hall effect is a physical phenomenon that describes the occurrence of magnetic-field-induced dielectric displacement at optical wavelengths, transverse and longitudinal to the incident electric field, and analogous to the static electrical Hall effect. The electrical Hall effect and certain cases of the optical Hall effect observations can be explained by extensions of the classic Drude model for the transport of electrons in metals. The optical Hall effect is most useful for characterization of electrical properties in semiconductors. Among many advantages, while the optical Hall effect dispenses with the need of electrical contacts, electrical material properties such as effective mass and mobility parameters, including their anisotropy as well as carrier type and density, can be determined from the optical Hall effect. Measurement of the optical Hall effect can be performed within the concept of generalized ellipsometry at an oblique angle of incidence. In this paper, we review and discuss physical model equations, which can be used to calculate the optical Hall effect in single- and multiple-layered structures of semiconductor materials. We define the optical Hall effect dielectric function tensor, demonstrate diagonalization approaches, and show requirements for the optical Hall effect tensor from energy conservation. We discuss both continuum and quantum approaches, and we provide a brief description of the generalized ellipsometry concept, the Mueller matrix calculus, and a 4×4 matrix algebra to calculate data accessible by experiment. In a follow-up paper, we will discuss strategies and approaches for experimental data acquisition and analysis. PMID:27505654

  1. General vibration monitoring: Experimental hall

    The reported vibration data were generated from measurements made on the experimental hall floor on December 2, 1992. At the time of the measurements, the ESRF hydrolevel was set-up in the Early Assembly Area (EAA) of the experimental hall and was being used to measure static displacement (settlement) of the floor. The vibration measurement area was on and adjacent to the EAA, in the vicinity of the ESRF hydrolevel test which was in progress. This report summarizes the objectives, instrumentation, measurement locations, observations, and conclusions, and provides selected results in the form of RMS vs. time plots, and power spectral densities from which frequency information can be derived. Measured response amplitudes were within the vibration criteria established for the APS

  2. Electron dynamics in Hall thruster

    Marini, Samuel; Pakter, Renato

    2015-11-01

    Hall thrusters are plasma engines those use an electromagnetic fields combination to confine electrons, generate and accelerate ions. Widely used by aerospace industries those thrusters stand out for its simple geometry, high specific impulse and low demand for electric power. Propulsion generated by those systems is due to acceleration of ions produced in an acceleration channel. The ions are generated by collision of electrons with propellant gas atoms. In this context, we can realize how important is characterizing the electronic dynamics. Using Hamiltonian formalism, we derive the electron motion equation in a simplified electromagnetic fields configuration observed in hall thrusters. We found conditions those must be satisfied by electromagnetic fields to have electronic confinement in acceleration channel. We present configurations of electromagnetic fields those maximize propellant gas ionization and thus make propulsion more efficient. This work was supported by CNPq.

  3. Symmetric functions and Hall polynomials

    MacDonald, Ian Grant

    1998-01-01

    This reissued classic text is the acclaimed second edition of Professor Ian Macdonald's groundbreaking monograph on symmetric functions and Hall polynomials. The first edition was published in 1979, before being significantly expanded into the present edition in 1995. This text is widely regarded as the best source of information on Hall polynomials and what have come to be known as Macdonald polynomials, central to a number of key developments in mathematics and mathematical physics in the 21st century Macdonald polynomials gave rise to the subject of double affine Hecke algebras (or Cherednik algebras) important in representation theory. String theorists use Macdonald polynomials to attack the so-called AGT conjectures. Macdonald polynomials have been recently used to construct knot invariants. They are also a central tool for a theory of integrable stochastic models that have found a number of applications in probability, such as random matrices, directed polymers in random media, driven lattice gases, and...

  4. Automated Micro Hall Effect measurements

    Petersen, Dirch Hjorth; Henrichsen, Henrik Hartmann; Lin, Rong;

    2014-01-01

    With increasing complexity of processes and variety of materials used for semiconductor devices, stringent control of the electronic properties is becoming ever more relevant. Collinear micro four-point probe (M4PP) based measurement systems have become high-end metrology methods for characteriza...... characterization and monitoring of sheet resistance as well as sheet carrier density and mobility via the Micro Hall Effect (MHE) method....

  5. Viscosity of Quantum Hall Fluids

    Avron, J. E.; Seiler, R.; Zograf, P. G.

    1995-01-01

    The viscosity of quantum fluids with an energy gap at zero temperature is non-dissipative and is related to the adiabatic curvature on the space of flat background metrics (which plays the role of the parameter space). For a quantum Hall fluid on two dimensional tori this viscosity is computed. In this case the average viscosity is quantized and is proportional to the total magnetic flux through the torus.

  6. Hall-magnetohydrodynamic small-scale dynamos.

    Gómez, Daniel O; Mininni, Pablo D; Dmitruk, Pablo

    2010-09-01

    Magnetic field generation by dynamo action is often studied within the theoretical framework of magnetohydrodynamics (MHD). However, for sufficiently diffuse media, the Hall effect may become non-negligible. We present results from three-dimensional simulations of the Hall-MHD equations subjected to random nonhelical forcing. We study the role of the Hall effect in the dynamo efficiency for different values of the Hall parameter. For small values of the Hall parameter, the small-scale dynamo is more efficient, displaying faster growth and saturating at larger amplitudes of the magnetic field. For larger values of the Hall parameter, saturation of the magnetic field is reached at smaller amplitudes than in the MHD case. We also study energy transfer rates among spatial scales and show that the Hall effect produces a reduction of the direct energy cascade at scales larger than the Hall scale, therefore leading to smaller energy dissipation rates. Finally, we present results stemming from simulations at large magnetic Prandtl numbers, which is the relevant regime in the hot and diffuse interstellar medium. In the range of magnetic Prandtl numbers considered, the Hall effect moves the peak of the magnetic energy spectrum as well as other relevant magnetic length scales toward the Hall scale. PMID:21230195

  7. Fractional quantum Hall effect revisited

    Jacak, J., E-mail: janusz.jacak@pwr.edu.pl; Łydżba, P., E-mail: patrycja.lydzba@pwr.edu.pl; Jacak, L., E-mail: lucjan.jacak@pwr.edu.pl

    2015-10-15

    The topology-based explanation of the fractional quantum Hall effect (FQHE) is summarized. The cyclotron braid subgroups crucial for this approach are introduced in order to identify the origin of the Laughlin correlations in 2D (two-dimensional) Hall systems. Flux-tubes and vortices for composite fermions in their standard constructions are explained in terms of cyclotron braids. The derivation of the hierarchy of the FQHE is proposed by mapping onto the integer effect within the topology-based approach. The experimental observations of the FQHE supporting the cyclotron braid picture are reviewed with a special attention paid to recent experiments with a suspended graphene. The triggering role of a carrier mobility for organization of the fractional state in Hall configuration is emphasized. The prerequisites for the FQHE are indicated including topological conditions substantially increasing the previously accepted set of physical necessities. The explanation of numerical studies by exact diagonalizations of the fractional Chern insulator states is formulated in terms of the topology condition applied to the Berry field flux quantization. Some new ideas withz regard to the synthetic fractional states in the optical lattices are also formulated.

  8. Annual report on JEN-1 reactor

    In the annual report on the JEN-1 reactor the main features of the reactor operations and maintenance are described. The reactor has been critical for 1831 hours, what means 65,8% of the total working time. Maintenance and pool water contamination have occupied the rest of the time. The maintenance schedule is shown in detail according to three subjects. The main failures and reactor scrams are also described. The daily maximum values of the water activity are given so as the activity of the air in the reactor hall. (Author)

  9. Vigilancia epidemiológica para el infarto agudo al miocardio, experiencia obtenida en el Hospital Calderón Guardia

    Manrique leal-Mateos

    2005-04-01

    Full Text Available Justificación y objetivo: Debido a que el infarto agudo al miocardio representa una de las principales causas de muerte en nuestro país, la autoridades de salud decidieron, en 2003, incluirlo como una enfermedad sujeta a vigilancia epidemiológica. El presente trabajo tiene como propósito dar a conocer la información más sobresaliente del sistema de vigilancia epidemiológica para el IAM, implementado en el servicio de Medicina Interna del Hospital Calderón Guardia. Metodología: Se realizó un análisis descriptivo de la información recolectada desde el 1 de octubre de 2003, al 30 de septiembre de 2004. Las variables cualitativas se analizaron mediante frecuencias y proporciones. Las variables cuantitativas se expresaron por medio de medidas de tendencia central y dispersión. Las diferencias entre promedios y proporciones se compararon mediante la prueba de t Student. La significancia estadística fue fijada en p Rationale and Objective: Since acute myocardial infarction represents one of the main causes of death in our country, the health authorities decided in the year 2003 to include it as an illness subject to epidemiological surveillance. The present paper has as its purpose to give the most salient information of the epidemiological surveillance system for myocardial infarction implemented in the Internal Medicine service of the Calderón Guardia hospital. Methods: We did a descriptive analysis of the information collected since October First, 2003 and until September the 30th., 2004. Qualitative variables were analyzed with frequencies and proportions. The quantitative variables were expressed by means of measures of central tendency as well as measures of dispersion. The differences between averages and proportions were compared with the Student's t test. Statistical significance was fixed at less or equal to 0.05. We used the Epi Info program for data processing. Results: The age average was 64.6 years (S.D. + 12.2 years. 66

  10. Reactor Materials Program - Baseline Material Property Handbook - Mechanical Properties of 1950's Vintage Stainless Steel Weldment Components, Task Number 89-23-A-1

    Stoner, K.J.

    1999-11-05

    The Process Water System (primary coolant) piping of the nuclear production reactors constructed in the 1950''s at Savannah River Site is comprised primarily of Type 304 stainless steel with Type 308 stainless steel weld filler. A program to measure the mechanical properties of archival PWS piping and weld materials (having approximately six years of service at temperatures between 25 and 100 degrees C) has been completed. The results from the mechanical testing has been synthesized to provide a mechanical properties database for structural analyses of the SRS piping.

  11. Reactor Materials Program - Baseline Material Property Handbook - Mechanical Properties of 1950's Vintage Stainless Steel Weldment Components, Task Number 89-23-A-1; FINAL

    The Process Water System (primary coolant) piping of the nuclear production reactors constructed in the 1950''s at Savannah River Site is comprised primarily of Type 304 stainless steel with Type 308 stainless steel weld filler. A program to measure the mechanical properties of archival PWS piping and weld materials (having approximately six years of service at temperatures between 25 and 100 degrees C) has been completed. The results from the mechanical testing has been synthesized to provide a mechanical properties database for structural analyses of the SRS piping

  12. Nuclear Reactors

    Hogerton, John

    1964-01-01

    This pamphlet describes how reactors work; discusses reactor design; describes research, teaching, and materials testing reactors; production reactors; reactors for electric power generation; reactors for supply heat; reactors for propulsion; reactors for space; reactor safety; and reactors of tomorrow. The appendix discusses characteristics of U.S. civilian power reactor concepts and lists some of the U.S. reactor power projects, with location, type, capacity, owner, and startup date.

  13. Vigilancia epidemiológica para el infarto agudo al miocardio, experiencia obtenida en el Hospital Calderón Guardia

    Manrique leal-Mateos

    2005-04-01

    Full Text Available Justificación y objetivo: Debido a que el infarto agudo al miocardio representa una de las principales causas de muerte en nuestro país, la autoridades de salud decidieron, en 2003, incluirlo como una enfermedad sujeta a vigilancia epidemiológica. El presente trabajo tiene como propósito dar a conocer la información más sobresaliente del sistema de vigilancia epidemiológica para el IAM, implementado en el servicio de Medicina Interna del Hospital Calderón Guardia. Metodología: Se realizó un análisis descriptivo de la información recolectada desde el 1 de octubre de 2003, al 30 de septiembre de 2004. Las variables cualitativas se analizaron mediante frecuencias y proporciones. Las variables cuantitativas se expresaron por medio de medidas de tendencia central y dispersión. Las diferencias entre promedios y proporciones se compararon mediante la prueba de t Student. La significancia estadística fue fijada en p < 0.05. Se utilizó el programa Epilnfo 2002 para el procesamiento de los datos. Resultados: El promedio de edad fue de 64,6 años (DE + 12,2 años. El 66,1 % (n=84 de los pacientes eran hombres. El porcentaje de paciente con dislipidemias fue significativamente mayor en las mujeres que en los hombres (p=0,007. El mismo resultado se obtuvo con la hipertensión arterial (p=0,007. Por el contrario, el porcentaje de pacientes que fumaban fue significativamente mayor en los hombres que en las mujeres (p < 0,0001. El 71,7% (n=91 de los pacientes fueron clasificados como Killip-Kimball I. El 18,4% (n=23 presentaron complicaciones durante su estancia hospitalaria. La mortalidad en el servicio de Medicina Interna del Hospital Calderón Guardia fue del 6,3% (n=8. Conclusión: El sistema de vigilancia epidemiológica para el infarto agudo al miocardio propuesto en este trabajo, se presenta como una herramienta útil para orientar las estrategias necesarias que contribuyan a mejorar el conocimiento que se tiene del paciente que padece de

  14. Spin Hall effect by surface roughness

    Zhou, Lingjun

    2015-01-08

    The spin Hall and its inverse effects, driven by the spin orbit interaction, provide an interconversion mechanism between spin and charge currents. Since the spin Hall effect generates and manipulates spin current electrically, to achieve a large effect is becoming an important topic in both academia and industries. So far, materials with heavy elements carrying a strong spin orbit interaction, provide the only option. We propose here a new mechanism, using the surface roughness in ultrathin films, to enhance the spin Hall effect without heavy elements. Our analysis based on Cu and Al thin films suggests that surface roughness is capable of driving a spin Hall angle that is comparable to that in bulk Au. We also demonstrate that the spin Hall effect induced by surface roughness subscribes only to the side-jump contribution but not the skew scattering. The paradigm proposed in this paper provides the second, not if only, alternative to generate a sizable spin Hall effect.

  15. Supersymmetric Quantum Hall Effect on Fuzzy Supersphere

    Hasebe, Kazuki

    2004-01-01

    Supersymmetric quantum Hall liquids are constructed on a supersphere in a supermonopole background. We derive a supersymmetric generalization of the Laughlin wavefunction, which is a ground state of a hard-core $OSp(1|2)$ invariant Hamiltonian. We also present excited topological objects, which are fractionally charged deficits made by super Hall currents. Several relations between quantum Hall systems and their supersymmetric extensions are discussed.

  16. Quantum Hall Physics in String Theory

    Bergman, Oren

    2004-01-01

    In certain backgrounds string theory exhibits quantum Hall-like behavior. These backgrounds provide an explicit realization of the effective non-commutative gauge theory description of the fractional quantum Hall effect (FQHE), and of the corresponding large N matrix model. I review results on the string theory realization of the two-dimensional fractional quantum Hall fluid (FQHF), and describe new results on the stringy description of higher-dimensional analogs.

  17. Intrinsic spin Hall effect in noncubic crystals

    Chudnovsky, E. M.

    2009-01-01

    We study the dependence of the intrinsic spin Hall effect on the crystal symmetry and geometry of experiment. The spin current is obtained and the Hall voltage caused by the polarization of the electron spins is computed. The unique dependence of the effect on the crystal symmetry permits the choice of geometry in which the spin Hall effect can be unambiguously distinguished from the effects due to the orbital motion of charge carriers and due to the magnetic field generated by the transport ...

  18. Reseción esofágica por cáncer, experiencia del Servicio de Cirugía de Tórax del Hospital Dr. Rafael Á. Calderón Guardia

    José Alberto Mainieri-Hidalgo

    2007-10-01

    Full Text Available Durante el período comprendido entre 1990 y 2006, 28 pacientes fueron sometidos a resección esofágica por cáncer en el Servicio de Cirugía de Tórax del Hospital Dr. Rafael Á. Calderón Guardia. La edad promedio fue de 65 años y la relación hombre mujer, de 6 a 1. El antecedente de tabaquismo se confirmó en un 80%, etilismo en un 75% y 8 pacientes eran conocidos portadores de esófago de Barret. Disfagia, dolor epigástrico y pérdida de peso fueron los síntomas más frecuentes; siendo la epigastralgia debida a otra patología digestiva coexistente, como reflujo o enfermedad péptica. Los pacientes clasificados como estadio IIb, III y IV recibieron terapia de inducción y aunque en 3 de estos no se encontró tumor residual en la pieza quirúrgica, en 2 casos quedó tumor adherido a la aorta. A 21 pacientes se les realizó esofagectomía total con ascenso gástrico y anastomosis cervical y a 7 esofagectomía parcial con ascenso gástrico al tórax en 5 y 2 esófago-yeyuno anastomosis, una intratorácica y otra abdominal. La complicación más frecuente fue la claudicación respiratoria por bronconeumonía, que se produjo en 7 pacientes y que fue mortal en 3. Dos de estos pacientes presentaron además fuga de anastomosis, una en el cuello y otra en el tórax. A largo plazo la complicación más frecuente fue estrechez de la anastomosis, que en los 7 casos se ha manejado con dilataciones. La mortalidad quirúrgica fue del 10.7% y en los 3 casos la bronconeumonía fue la causa principal. La supervivencia a 5 y 10 años fue del 31.5% y el 18%, respectivamente.

  19. Decommissioning of Salaspils nuclear reactor

    In May 1995, the Latvian Government decided to shut down the Research Reactor Salaspils (SRR) and to dispense with nuclear energy in future. The reactor has been out of operation since July 1998. A conceptual study for the decommissioning of SRR has been carried out by Noell-KRC-Energie- und Umwelttechnik GmbH from 1998-1999. he Latvian Government decided on 26 October 1999 to start the direct dismantling to 'green field' in 2001. The results of decommissioning and dismantling performed in 1999-2001 are presented and discussed. The main efforts were devoted to collecting and conditioning 'historical' radioactive waste from different storages outside and inside the reactor hall. All radioactive material more than 20 tons were conditioned in concrete containers for disposal in the radioactive waste depository 'Radons' in the Baldone site. Personal protective and radiation measurement equipment was upgraded significantly. All non-radioactive equipment and material outside the reactor buildings were free-released and dismantled for reuse or conventional disposal. Weakly contaminated material from the reactor hall was collected and removed for free-release measurements. The technology of dismantling of the reactor's systems, i.e. second cooling circuit, zero power reactors and equipment, is discussed in the paper. (author)

  20. Unusual Properties of Anisotropic Hall Gas: Implication to Metrology of the Integer Quantum Hall Effect

    Ishikawa, K; Maeda, N.

    2001-01-01

    Physical properties of anisotropic compressible quantum Hall states and their implications to integer quantum Hall effect are studied based on a mean field theory on the von Neumann lattice. It is found that the Hall gas has unusual thermodynamic properties such as negative pressure and negative compressibility and unusual transport properties. Transport properties and density profile of Hall gas states at half fillings agree with those of anisotropic states discovered experimentally in highe...

  1. Field Theory of Anisotropic Quantum Hall Gas: Metrology and a Novel Quantum Hall Regime

    Ishikawa, K; Aoyama, T.; Ishizuka, Y.; Maeda, N.

    2003-01-01

    The von Neumann lattice representation is a convenient representation for studying several intriguing physics of quantum Hall systems. In this formalism, electrons are mapped to lattice fermions. A topological invariant expression of the Hall conductance is derived and is used for the proof of the integer quantum Hall effect in the realistic situation. Anisotropic quantum Hall gas is investigated based on the Hartree-Fock approximation in the same formalism. Thermodynamic properties, transpor...

  2. Bridge connection of quantum Hall elementary devices

    Callegaro, Luca

    2013-01-01

    Multiple-series and multiple-parallel connections of quantum Hall elementary devices allow the realization of multiple or fractional values of the quantized Hall resistance, rejecting the effect of contact and wiring resistances. We introduce here the multiple-bridge connection, which maintains the properties of multiple-series and parallel connections and allows more freedom in the choice of the topology of networks composed of quantum Hall elements, and the design of more efficient quantum Hall array resistance standards (and other devices). As an example, a 5-element network is analyzed in detail.

  3. Anomalous Hall effect in polycrystalline Ni films

    Guo, Zaibing

    2012-02-01

    We systematically studied the anomalous Hall effect in a series of polycrystalline Ni films with thickness ranging from 4 to 200 nm. It is found that both the longitudinal and anomalous Hall resistivity increased greatly as film thickness decreased. This enhancement should be related to the surface scattering. In the ultrathin films (46 nm thick), weak localization corrections to anomalous Hall conductivity were studied. The granular model, taking into account the dominated intergranular tunneling, has been employed to explain this phenomenon, which can explain the weak dependence of anomalous Hall resistivity on longitudinal resistivity as well. © 2011 Elsevier Ltd. All rights reserved.

  4. Listening to the acoustics in concert halls

    Beranek, Leo L.; Griesinger, David

    2001-05-01

    How does acoustics affect the symphonic music performed in a concert hall? The lecture begins with an illustrated discussion of the architectural features that influence the acoustics. Boston Symphony Hall, which was built in 1900 when only one facet of architectural design was known, now rates as one of the world's great halls. How this occurred will be presented. Music is composed with some acoustical environment in mind and this varies with time from the Baroque to the Romantic to the Modern musical period. Conductors vary their interpretation according to the hall they are in. Well-traveled listeners and music critics have favorite halls. The lecture then presents a list of 58 halls rank ordered according to their acoustical quality based on interviews of music critics and conductors. Modern acoustical measurements made in these halls are compared with their rankings. Music recordings will be presented that demonstrate how halls sound that have different measured acoustical parameters. Photographs of a number of recently built halls are shown as examples of how these known acoustical factors have been incorporated into architectural design.

  5. Lectures on the Quantum Hall Effect

    Tong, David

    2016-01-01

    The purpose of these lectures is to describe the basic theoretical structures underlying the rich and beautiful physics of the quantum Hall effect. The focus is on the interplay between microscopic wavefunctions, long-distance effective Chern-Simons theories, and the modes which live on the boundary. The notes are aimed at graduate students in any discipline where $\\hbar=1$. A working knowledge of quantum field theory is assumed. Contents: 1. The Basics (Landau levels and Berry phase). 2. The Integer Quantum Hall Effect. 3. The Fractional Quantum Hall Effect. 4. Non-Abelian Quantum Hall States. 5. Chern-Simons Theories. 6. Edge Modes.

  6. Impact of neutron irradiation on ITER candidate Hall sensors

    Sentkerestiová, Jana; Ďuran, Ivan; Bolshakova, I.; Viererbl, L.

    Varšava: European Physical Society, 2007. s. 2-2. [EPS Conference on Plasma Physics/34rd./. 02.07.2007-06.07.2007, Varšava] R&D Projects: GA MPO 2A-1TP1/101 Institutional research plan: CEZ:AV0Z20430508 Keywords : Hall sensors * neutron irradiation * ITER Subject RIV: BL - Plasma and Gas Discharge Physics

  7. Backfitting swimming pool reactors

    Calculations based on measurements in a critical assembly, and experiments to disclose fuel element surface temperatures in case of accidents like stopping of primary coolant flow during full power operation, have shown that the power of the swimming pool type research reactor FRG-2 (15 MW, operating since 1967) might be raised to 21 MW within the present rules of science and technology, without major alterations of the pool buildings and the cooling systems. A backfitting program is carried through to adjust the reactor control systems of FRG-2 and FRG-1 (5 MW, housed in the same reactor hall) to the present safety rules and recommendations, to ensure FRG-2 operation at 21 MW for the next decade. (author)

  8. Electron Transport in Hall Thrusters

    McDonald, Michael Sean

    Despite high technological maturity and a long flight heritage, computer models of Hall thrusters remain dependent on empirical inputs and a large part of thruster development to date has been heavily experimental in nature. This empirical approach will become increasingly unsustainable as new high-power thrusters tax existing ground test facilities and more exotic thruster designs stretch and strain the boundaries of existing design experience. The fundamental obstacle preventing predictive modeling of Hall thruster plasma properties and channel erosion is the lack of a first-principles description of electron transport across the strong magnetic fields between the cathode and anode. In spite of an abundance of proposed transport mechanisms, accurate assessments of the magnitude of electron current due to any one mechanism are scarce, and comparative studies of their relative influence on a single thruster platform simply do not exist. Lacking a clear idea of what mechanism(s) are primarily responsible for transport, it is understandably difficult for the electric propulsion scientist to focus his or her theoretical and computational tools on the right targets. This work presents a primarily experimental investigation of collisional and turbulent Hall thruster electron transport mechanisms. High-speed imaging of the thruster discharge channel at tens of thousands of frames per second reveals omnipresent rotating regions of elevated light emission, identified with a rotating spoke instability. This turbulent instability has been shown through construction of an azimuthally segmented anode to drive significant cross-field electron current in the discharge channel, and suggestive evidence points to its spatial extent into the thruster near-field plume as well. Electron trajectory simulations in experimentally measured thruster electromagnetic fields indicate that binary collisional transport mechanisms are not significant in the thruster plume, and experiments

  9. Partially split Hall bar: Tunneling in the bosonic integer quantum Hall effect

    Mulligan, Michael; Fisher, Matthew P. A.

    2014-01-01

    We study point-contact tunneling in the integer quantum Hall state of bosons. This symmetry-protected topological state has electrical Hall conductivity equal to 2e^2/h and vanishing thermal Hall conductivity. In contrast to the integer quantum Hall state of fermions, a point contact can have a dramatic effect on the low-energy physics. In the absence of disorder, a point contact generically leads to a partially split Hall bar geometry. We describe the resulting intermediate fixed point via t...

  10. The Partially-Split Hall Bar: Tunneling in the Bosonic Integer Quantum Hall Effect

    Mulligan, Michael; Fisher, Matthew P. A.

    2013-01-01

    We study point-contact tunneling in the integer quantum Hall state of bosons. This symmetry-protected topological state has electrical Hall conductivity equal to $2 e^2/h$ and vanishing thermal Hall conductivity. In contrast to the integer quantum Hall state of fermions, a point contact can have a dramatic effect on the low energy physics. In the absence of disorder, a point contact generically leads to a partially-split Hall bar geometry. We describe the resulting intermediate fixed point vi...

  11. The hall effect in magnetic reconnection: Hybrid versus Hall-less hybrid simulations

    Malakit, K.; Cassak, P. A.; Shay, M. A.; Drake, J. F.

    2009-04-01

    To understand the role of the Hall effect during fast magnetic reconnection, hybrid simulations with and without the Hall term in the generalized Ohm's Law are compared, as done originally by Karimabadi et al. (2004). It is found that reconnection with the Hall term is fast, but reconnection in the so-called Hall-less hybrid simulations is Sweet-Parker like (slow) when the resistivity is constant and uniform. These results re-affirm the importance of the Hall term in allowing fast reconnection in the hybrid model.

  12. Annual report on JEN-1 reactor; Informe periodico del Reactor JEN-1 correspondiente al ano 1971

    Montes, J.

    1972-07-01

    In the annual report on the JEN-1 reactor the main features of the reactor operations and maintenance are described. The reactor has been critical for 1831 hours, what means 65,8% of the total working time. Maintenance and pool water contamination have occupied the rest of the time. The maintenance schedule is shown in detail according to three subjects. The main failures and reactor scrams are also described. The daily maximum values of the water activity are given so as the activity of the air in the reactor hall. (Author)

  13. A Holographic Quantum Hall Ferromagnet

    Kristjansen, C; Semenoff, G W

    2013-01-01

    A detailed numerical study of a recent proposal for exotic states of the D3-probe D5 brane system with charge density and an external magnetic field is presented. The state has a large number of coincident D5 branes blowing up to a D7 brane in the presence of the worldvolume electric and magnetic fields which are necessary to construct the holographic state. Numerical solutions have shown that these states can compete with the the previously known chiral symmetry breaking and maximally symmetric phases of the D3-D5 system. Moreover, at integer filling fractions, they are incompressible with integer quantized Hall conductivities. In the dual superconformal defect field theory, these solutions correspond to states which break the chiral and global flavor symmetries spontaneously. The region of the temperature-density plane where the D7 brane has lower energy than the other known D5 brane solutions is identified. A hypothesis for the structure of states with filling fraction and Hall conductivity greater than on...

  14. Acoustical parameters in concert hall acoustics

    LIU Ke; ZHOU Qijun

    2003-01-01

    Professor Beranek talked about the sound qualities of concert hall. The 58 famousconcert halls in the world were graded according to the subjective comparison from the profes-sional musicians and music lovers. Six measurable objective parameters were proposed. Theranking according to these parameters were presented.

  15. Metal-Film Hall-Effect Devices

    Peters, Palmer N.

    1994-01-01

    Large positive and negative Hall coefficients achievable. Family of Hall-effect devices made from multilayer metal films instead of semiconductor materials. Metal films easier to fabricate; formed by deposition on variety of substrates, and leads readily attached to them. Fabricated with larger areas, potentially more reliable, and less affected by impurities. Also used to measure magnetic fields. Devices especially useful at low temperatures.

  16. Training Top 10 Hall of Fame

    Training, 2012

    2012-01-01

    Microsoft Corporation and SCC Soft Computer are the newest inductees into the Training Top 10 Hall of Fame, joining the ranks of the 11 companies named to the hall since its inception in 2008 (Wyeth Pharmaceuticals subsequently was acquired by Pfizer Inc. in 2009). These 11 companies held Top 10 spots in the Training Top 50, Top 100, and now Top…

  17. The Scientific Humanism of G. Stanley Hall

    Meyer, Donald H.

    1971-01-01

    This paper presents the humanistic psychology of the pioneer American psychologist Granville Stanley Hall (1844-1924), examining Hall's effort to develop a system of psychology that is at once rigorously scientific and, simultaneously, capable of verifying essential human values. (Author)

  18. Kelvin's Canonical Circulation Theorem in Hall Magnetohydrodynamics

    Shivamoggi, B K

    2016-01-01

    The purpose of this paper is to show that, thanks to the restoration of the legitimate connection between the current density and the plasma flow velocity in Hall magnetohydrodynamics (MHD), Kelvin's Circulation Theorem becomes valid in Hall MHD. The ion-flow velocity in the usual circulation integral is now replaced by the canonical ion-flow velocity.

  19. Quantum Hall Effect in Quantum Electrodynamics

    Penin, Alexander A.

    2008-01-01

    We consider the quantum Hall effect in quantum electrodynamics and find a deviation from the quantum mechanical prediction for the Hall conductivity due to radiative antiscreening of electric charge in an external magnetic field. A weak universal dependence of the von Klitzing constant on the magnetic field strength, which can possibly be observed in a dedicated experiment, is predicted.

  20. 19th Annual Residence Hall Construction Report

    Agron, Joe

    2008-01-01

    The construction of residence hall facilities at colleges and universities continues to be strong, as institutions scramble to meet the housing needs and varied demands of a growing student population. This article presents data collected from 39 new residence hall projects completed in 2007. According to American School & University's 19th annual…

  1. Flexible Hall sensors based on graphene

    Wang, Zhenxing; Shaygan, Mehrdad; Otto, Martin; Schall, Daniel; Neumaier, Daniel

    2016-03-01

    The excellent electronic and mechanical properties of graphene provide a perfect basis for high performance flexible electronic and sensor devices. Here, we present the fabrication and characterization of flexible graphene based Hall sensors. The Hall sensors are fabricated on 50 μm thick flexible Kapton foil using large scale graphene grown by chemical vapor deposition technique on copper foil. Voltage and current normalized sensitivities of up to 0.096 V VT-1 and 79 V AT-1 were measured, respectively. These values are comparable to the sensitivity of rigid silicon based Hall sensors and are the highest values reported so far for any flexible Hall sensor devices. The sensitivity of the Hall sensor shows no degradation after being bent to a minimum radius of 4 mm, which corresponds to a tensile strain of 0.6%, and after 1000 bending cycles to a radius of 5 mm.

  2. ORPHEE reactor. Upgrade of the installation

    Designed by the end of the seventies, the ORPHEE Reactor is equipped with two hydrogen cold sources, one hot source and six cold neutron guides. The neutron beams are extracted by nine beam ports and used in two experimental halls, the reactor hall and the neutron guide hall. After fourteen years of use, a modernisation programme is in progress. One step concerns the neutron guides, another one the cold sources with the modification of the cell geometry in order to increase the cold neutron flux. This operation requires the use a new cryogenerator to ensure liquefaction capabilities for the new cells. It is also scheduled to replace the Zircaloy core housing in order to avoid difficulties linked to the expansion under irradiation. (author)

  3. Leiomioma esofágico: Experiencia con diez casos operados en el "Hospital Dr. Rafael Ángel Calderón Guardia"

    Giovanna Mainieri-Breedy

    2012-09-01

    Full Text Available Objetivo: informar la experiencia adquirida con la cirugía para leiomiomas esofágicos en el Servicio de Cirugía de Tórax del Hospital Dr. R. A. Calderón Guardia. Métodos: durante el período de 12 años comprendido entre 1999 y 2011, fueron referidos 14 pacientes con tumores submucosos del esófago al Servicio de Cirugía de Tórax del Hospital Calderón Guardia. En cuatro pacientes asintomáticos con tumores pequeños se decidió observar, y diez fueron operados, confirmándose el diagnóstico histológico de leiomioma. Previa autorización del Comité de Ética del Hospital, se revisaron los expedientes clínicos, analizando las características personales, los síntomas, los métodos de diagnóstico, el tratamiento quirúrgico y la evolución de los pacientes operados. Resultados: se encontró que de los diez pacientes operados, ocho fueron varones, en edades entre los 38 y 71 años, con un promedio de 56 años. El síntoma principal fue disfagia, pero en 3 casos el tumor fue un hallazgo incidental de una endoscopia de rutina. El método de detección en todos los casos fue la endoscopia en la que se describió un tumor submucoso o una compresión extrínseca de la pared esofágica. El ultrasonido endoscópico se correlacionó con un tumor originado en la cuarta capa, posible leiomioma. En dos casos, debido a las dimensiones de la lesión, se planteó la posibilidad de malignidad. La tumoración se intervino en nueve casos por toracotomía y en uno, por laparotomía. En 7 casos se enucleó sin que se abriera la mucosa, en dos se realizó esofagectomía parcial con anastomosis y parche de diafragma, y en un caso, excepcional, la tumoración se extendía desde el esófago cervical hasta la unión esófago-gástrica, de manera que se realizó una esofagectomía total, con ascenso gástrico y anastomosis cervical. No hubo ningún caso de mortalidad. Un paciente presentó una pequeña fuga de la anastomosis, la cual resolvió espont

  4. Observation of spin Hall effective field

    Fan, Xin; Wu, Jun; Chen, Yunpeng; Jerry, Matthew; Zhang, Huaiwu; Xiao, John

    2013-03-01

    Recent development in spin Hall driven spin transfer torque has attracted intensive interests1. Liu et. al. has shown that the spin transfer torque induced by the spin Hall effect in a normal metal-ferromagnetic metal bilayer can switch the magnetization of the ferromagnetic layer, which may be a potential candidate for magnetic random access memory2. The switching of the magnetization was primarily attributed to the Slonczewski torque3. We show that besides the Slonczewski torque, the spin Hall effect also produces an effective field that can also facilitate the magnetization reversal. This effective field persists even with a Cu spacer layer, and reduces quickly with the increase of the ferromagnetic layer thickness. The observation of the spin Hall effective field shall have ramification on the understanding of both spin transfer torque and spin Hall effect. 1. K. Ando et. al., Electric manipulation of spin relaxation using the spin Hall effect, Physical Review Letters, 101, 036601 (2008). 2. L. Liu et. al., Spin-Torque Switching with the Giant Spin Hall Effect of Tantalum. Science 336, 555-558 (2012). 3. J. Slonczewski, Current-driven excitation of magnetic multilayers. Journal of Magnetism and Magnetic Materials, 159, L1-L7 (1996).

  5. Geometric Hall effects in topological insulator heterostructures

    Yasuda, K.; Wakatsuki, R.; Morimoto, T.; Yoshimi, R.; Tsukazaki, A.; Takahashi, K. S.; Ezawa, M.; Kawasaki, M.; Nagaosa, N.; Tokura, Y.

    2016-06-01

    Geometry, both in momentum and in real space, plays an important role in the electronic dynamics of condensed matter systems. Among them, the Berry phase associated with nontrivial geometry can be an origin of the transverse motion of electrons, giving rise to various geometric effects such as the anomalous, spin and topological Hall effects. Here, we report two unconventional manifestations of Hall physics: a sign-reversal of the anomalous Hall effect, and the emergence of a topological Hall effect in magnetic/non-magnetic topological insulator heterostructures, Crx(Bi1-ySby)2-xTe3/(Bi1-ySby)2Te3. The sign-reversal in the anomalous Hall effect is driven by a Rashba splitting at the bulk bands, which is caused by the broken spatial inversion symmetry. Instead, the topological Hall effect arises in a wide temperature range below the Curie temperature, in a region where the magnetic-field dependence of the Hall resistance largely deviates from the magnetization. Its origin is assigned to the formation of a Néel-type skyrmion induced by the Dzyaloshinskii-Moriya interaction.

  6. Los sistemas de barrancos mexicanos, un recurso potencial para el turismo alternativo. El caso de los Barrancos del río Calderón, Estado de México

    José Isabel Juan Pérez; José Francisco Monroy Gaytán; Jesús Gastón Gutiérrez Cedillo; Xanat Antonio Némiga; Miguel Ángel Balderas Plata

    2009-01-01

    El sistema de barrancos del río Calderón, ubicado al sureste del Estado de México,que comprende porciones de los municipios de Villa Guerrero, Ixtapan de La Sal y Zumpahuacán, representa un elemento geográfico de trascendencia para las familias de la región. En este lugar coexisten diversos ecosistemas con elementos geográficos, paisajísticos, geomorfológicos, hidrológicos y amplia biodiversidad que pueden ser utilizados para el turismo alternativo. Mediante el método geográfico, incluyendo c...

  7. Joule heating in spin Hall geometry

    Taniguchi, Tomohiro

    2016-07-01

    The theoretical formula for the entropy production rate in the presence of spin current is derived using the spin-dependent transport equation and thermodynamics. This theory is applicable regardless of the source of the spin current, for example, an electric field, a temperature gradient, or the Hall effect. It reproduces the result in a previous work on the dissipation formula when the relaxation time approximation is applied to the spin relaxation rate. By using the developed theory, it is found that the dissipation in the spin Hall geometry has a contribution proportional to the square of the spin Hall angle.

  8. Quantized Hall conductance as a topological invariant

    Whenever the Fermi level lies in a gap (or mobility gap) the bulk Hall conductance can be expressed in a topologically invariant form showing the quantization explicitly. The new formulation generalizes the earlier result by TKNN to the situation where many body interaction and substrate disorder are also present. When applying to the fractional quantized Hall effect we draw the conclusion that there must be a symmetry breaking in the many body ground state. The possibility of writing the fractionally quantized Hall conductance as a topological invariant is also carefully discussed. 19 references

  9. Piezo Voltage Controlled Planar Hall Effect Devices

    Zhang, Bao; Meng, Kang-Kang; Yang, Mei-Yin; Edmonds, K. W.; Zhang, Hao; Cai, Kai-Ming; Sheng, Yu; Zhang, Nan; Ji, Yang; Zhao, Jian-Hua; Zheng, Hou-Zhi; Wang, Kai-You

    2016-06-01

    The electrical control of the magnetization switching in ferromagnets is highly desired for future spintronic applications. Here we report on hybrid piezoelectric (PZT)/ferromagnetic (Co2FeAl) devices in which the planar Hall voltage in the ferromagnetic layer is tuned solely by piezo voltages. The change of planar Hall voltage is associated with magnetization switching through 90° in the plane under piezo voltages. Room temperature magnetic NOT and NOR gates are demonstrated based on the piezo voltage controlled Co2FeAl planar Hall effect devices without the external magnetic field. Our demonstration may lead to the realization of both information storage and processing using ferromagnetic materials.

  10. Quantum Hall effect in higher dimensions

    Following recent work on the quantum Hall effect on S4, we solve the Landau problem on the complex projective spaces CPk and discuss quantum Hall states for such spaces. Unlike the case of S4, a finite spatial density can be obtained with a finite number of internal states for each particle. We treat the case of CP2 in some detail considering both Abelian and nonabelian background fields. The wavefunctions are obtained and incompressibility of the Hall states is shown. The case of CP3 is related to the case of S4