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Sample records for accuracy liga theory

  1. Local indicators of geocoding accuracy (LIGA: theory and application

    Directory of Open Access Journals (Sweden)

    Jacquez Geoffrey M

    2009-10-01

    Full Text Available Abstract Background Although sources of positional error in geographic locations (e.g. geocoding error used for describing and modeling spatial patterns are widely acknowledged, research on how such error impacts the statistical results has been limited. In this paper we explore techniques for quantifying the perturbability of spatial weights to different specifications of positional error. Results We find that a family of curves describes the relationship between perturbability and positional error, and use these curves to evaluate sensitivity of alternative spatial weight specifications to positional error both globally (when all locations are considered simultaneously and locally (to identify those locations that would benefit most from increased geocoding accuracy. We evaluate the approach in simulation studies, and demonstrate it using a case-control study of bladder cancer in south-eastern Michigan. Conclusion Three results are significant. First, the shape of the probability distributions of positional error (e.g. circular, elliptical, cross has little impact on the perturbability of spatial weights, which instead depends on the mean positional error. Second, our methodology allows researchers to evaluate the sensitivity of spatial statistics to positional accuracy for specific geographies. This has substantial practical implications since it makes possible routine sensitivity analysis of spatial statistics to positional error arising in geocoded street addresses, global positioning systems, LIDAR and other geographic data. Third, those locations with high perturbability (most sensitive to positional error and high leverage (that contribute the most to the spatial weight being considered will benefit the most from increased positional accuracy. These are rapidly identified using a new visualization tool we call the LIGA scatterplot. Herein lies a paradox for spatial analysis: For a given level of positional error increasing sample density

  2. Accuracy verification methods theory and algorithms

    CERN Document Server

    Mali, Olli; Repin, Sergey

    2014-01-01

    The importance of accuracy verification methods was understood at the very beginning of the development of numerical analysis. Recent decades have seen a rapid growth of results related to adaptive numerical methods and a posteriori estimates. However, in this important area there often exists a noticeable gap between mathematicians creating the theory and researchers developing applied algorithms that could be used in engineering and scientific computations for guaranteed and efficient error control.   The goals of the book are to (1) give a transparent explanation of the underlying mathematical theory in a style accessible not only to advanced numerical analysts but also to engineers and students; (2) present detailed step-by-step algorithms that follow from a theory; (3) discuss their advantages and drawbacks, areas of applicability, give recommendations and examples.

  3. Parallel Assembly of LIGA Components

    Energy Technology Data Exchange (ETDEWEB)

    Christenson, T.R.; Feddema, J.T.

    1999-03-04

    In this paper, a prototype robotic workcell for the parallel assembly of LIGA components is described. A Cartesian robot is used to press 386 and 485 micron diameter pins into a LIGA substrate and then place a 3-inch diameter wafer with LIGA gears onto the pins. Upward and downward looking microscopes are used to locate holes in the LIGA substrate, pins to be pressed in the holes, and gears to be placed on the pins. This vision system can locate parts within 3 microns, while the Cartesian manipulator can place the parts within 0.4 microns.

  4. On the accuracy of the asymptotic theory for cylindrical shells

    DEFF Research Database (Denmark)

    Niordson, Frithiof; Niordson, Christian

    1999-01-01

    We study the accuracy of the lowest-order bending theory of shells, derived from an asymptotic expansion of the three-dimensional theory of elasticity, by comparing the results of this shell theory for a cylindrical shell with clamped ends with the results of a solution to the three......-dimensional problem. The results are also compared with those of some commonly used engineering shell theories....

  5. Liga developer apparatus system

    Science.gov (United States)

    Boehme, Dale R.; Bankert, Michelle A.; Christenson, Todd R.

    2003-01-01

    A system to fabricate precise, high aspect ratio polymeric molds by photolithograpic process is described. The molds for producing micro-scale parts from engineering materials by the LIGA process. The invention is a developer system for developing a PMMA photoresist having exposed patterns comprising features having both very small sizes, and very high aspect ratios. The developer system of the present invention comprises a developer tank, an intermediate rinse tank and a final rinse tank, each tank having a source of high frequency sonic agitation, temperature control, and continuous filtration. It has been found that by moving a patterned wafer, through a specific sequence of developer/rinse solutions, where an intermediate rinse solution completes development of those portions of the exposed resist left undeveloped after the development solution, by agitating the solutions with a source of high frequency sonic vibration, and by adjusting and closely controlling the temperatures and continuously filtering and recirculating these solutions, it is possible to maintain the kinetic dissolution of the exposed PMMA polymer as the rate limiting step.

  6. General Theory versus ENA Theory: Comparing Their Predictive Accuracy and Scope.

    Science.gov (United States)

    Ellis, Lee; Hoskin, Anthony; Hartley, Richard; Walsh, Anthony; Widmayer, Alan; Ratnasingam, Malini

    2015-12-01

    General theory attributes criminal behavior primarily to low self-control, whereas evolutionary neuroandrogenic (ENA) theory envisions criminality as being a crude form of status-striving promoted by high brain exposure to androgens. General theory predicts that self-control will be negatively correlated with risk-taking, while ENA theory implies that these two variables should actually be positively correlated. According to ENA theory, traits such as pain tolerance and muscularity will be positively associated with risk-taking and criminality while general theory makes no predictions concerning these relationships. Data from Malaysia and the United States are used to test 10 hypotheses derived from one or both of these theories. As predicted by both theories, risk-taking was positively correlated with criminality in both countries. However, contrary to general theory and consistent with ENA theory, the correlation between self-control and risk-taking was positive in both countries. General theory's prediction of an inverse correlation between low self-control and criminality was largely supported by the U.S. data but only weakly supported by the Malaysian data. ENA theory's predictions of positive correlations between pain tolerance, muscularity, and offending were largely confirmed. For the 10 hypotheses tested, ENA theory surpassed general theory in predictive scope and accuracy.

  7. UV-LIGA: From Development to Commercialization

    Directory of Open Access Journals (Sweden)

    Grégoire Genolet

    2014-07-01

    Full Text Available A major breakthrough in UV-LIGA (Lithographie, Galvanoformung and Abformung started with the use of epoxy-based EPON® SU-8 photoresist in the mid-1990s. Using this photoresist has enabled the fabrication of tall and high aspect ratio structures without the use of a very expensive synchrotron source needed to expose the photoresist layer in X-ray LIGA. SU-8 photoresist appeared to be well-suited for LIGA templates, but also as a permanent material. Based on UV-LIGA and SU-8, Mimotec SA has developed processes to manufacture mold inserts and metallic components for various market fields. From one to three-level parts, from Ni to other materials, from simple to complicated parts with integrated functionalities, UV-LIGA has established itself as a manufacturing technology of importance for prototyping, as well as for mass-fabrication. This paper reviews some of the developments that led to commercial success in this field.

  8. Use of base metal casting alloys for implant framework: marginal accuracy analysis Uso de ligas metálicas básicas em próteses sobre implantes: análise da adaptação marginal

    Directory of Open Access Journals (Sweden)

    Stefania Carvalho Kano

    2004-12-01

    Full Text Available The original protocol for implant prosthesis recommends the use of a gold framework for acrylic and ceramic prosthesis. However, due to its high cost, the use of alternative alloys is desired. This study compares the marginal accuracy of pre-made cylinders versus plastic cylinders cast with two different base metal casting alloys. Five samples each of (1 plastic cylinder cast in cobalt-chromium alloy, (2 plastic cylinder cast in nickel-chromium alloy, and (3 silver-palladium pre-made cylinder (control were examined for marginal accuracy according to: (A vertical gap; (B horizontal gap and (C horizontal gap depth at the abutment/cylinder interface. Data were submitted to statistical analysis (ANOVA and Student-Newman Keuls, pO protocolo para prótese sobre implantes recomenda o uso de uma infra-estrutura em ouro para próteses metalo-plásticas e metalo-cerâmicas. No entanto, devido ao seu alto custo, o uso de ligas alternativas é desejado. OBJETIVO: Este estudo compara a adaptação marginal de cilindros protéticos pré-fabricados e cilindros protéticos plásticos fundidos com dois tipos de ligas metálicas básicas. MATERIAL E MÉTODOS: 05 amostras de (1 cilindros plásticos fundidos em liga de cobalto cromo; (2 cilindros plásticos fundidos em liga de níquel cromo e (3 cilindros pré-fabricados com cinta metálica em paládio, foram examinados na interface intermediário/cilindro protético na análise de desajuste marginal, considerando-se (A desajuste vertical, (B desajuste horizontal e (C profundidade de fenda. RESULTADOS: os valores médios para o desajuste vertical, horizontal e profundidade foram, respectivamente, 4,13µm, 14,5µm e 6,93µm para o cilindro pré-fabricado em paládio, 23,18µm, 33,2µm e 88µm para os cilindros plásticos fundidos em Níquel cromo e 25,6µm, 51,8µm e 114,54 µm para os cilindros fundidos em cobalto-cromo. CONCLUSÃO: não foram encontradas diferenças estatísticas entre os grupos fundidos (grupo 1

  9. An Information Theory Account of Preference Prediction Accuracy

    NARCIS (Netherlands)

    Pollmann, Monique; Scheibehenne, Benjamin

    2015-01-01

    Knowledge about other people's preferences is essential for successful social interactions, but what exactly are the driving factors that determine how well we can predict the likes and dislikes of people around us? To investigate the accuracy of couples’ preference predictions we outline and empiri

  10. Physical interpretation and accuracy of the Kubelka-Munk theory

    Energy Technology Data Exchange (ETDEWEB)

    Kokhanovsky, Alexander A [Institute of Remote Sensing, University of Bremen, O. Hahn Allee 1, D-28334 Bremen (Germany)

    2007-04-07

    Kubelka-Munk theory is used extensively in a number of industrial applications including colour matching. The main aim of this paper is the derivation of alternative analytical equations, which are more accurate than correspondent Kubelka-Munk formulae for light scattering materials of a finite optical depth. The derived equations are based on asymptotic radiative transfer theory valid for optically thick turbid media with arbitrary phase functions and single scattering albedos.

  11. The accuracy of QCD perturbation theory at high energies

    CERN Document Server

    Dalla Brida, Mattia; Korzec, Tomasz; Ramos, Alberto; Sint, Stefan; Sommer, Rainer

    2016-01-01

    We discuss the determination of the strong coupling $\\alpha_\\mathrm{\\overline{MS}}^{}(m_\\mathrm{Z})$ or equivalently the QCD $\\Lambda$-parameter. Its determination requires the use of perturbation theory in $\\alpha_s(\\mu)$ in some scheme, $s$, and at some energy scale $\\mu$. The higher the scale $\\mu$ the more accurate perturbation theory becomes, owing to asymptotic freedom. As one step in our computation of the $\\Lambda$-parameter in three-flavor QCD, we perform lattice computations in a scheme which allows us to non-perturbatively reach very high energies, corresponding to $\\alpha_s = 0.1$ and below. We find that perturbation theory is very accurate there, yielding a three percent error in the $\\Lambda$-parameter, while data around $\\alpha_s \\approx 0.2$ is clearly insufficient to quote such a precision. It is important to realize that these findings are expected to be generic, as our scheme has advantageous properties regarding the applicability of perturbation theory.

  12. Total x-ray power measurements in the Sandia LIGA program.

    Energy Technology Data Exchange (ETDEWEB)

    Malinowski, Michael E. (Sandia National Laboratories, Livermore, CA); Ting, Aili (Sandia National Laboratories, Livermore, CA)

    2005-08-01

    Total X-ray power measurements using aluminum block calorimetry and other techniques were made at LIGA X-ray scanner synchrotron beamlines located at both the Advanced Light Source (ALS) and the Advanced Photon Source (APS). This block calorimetry work was initially performed on the LIGA beamline 3.3.1 of the ALS to provide experimental checks of predictions of the LEX-D (LIGA Exposure- Development) code for LIGA X-ray exposures, version 7.56, the version of the code in use at the time calorimetry was done. These experiments showed that it was necessary to use bend magnet field strengths and electron storage ring energies different from the default values originally in the code in order to obtain good agreement between experiment and theory. The results indicated that agreement between LEX-D predictions and experiment could be as good as 5% only if (1) more accurate values of the ring energies, (2) local values of the magnet field at the beamline source point, and (3) the NIST database for X-ray/materials interactions were used as code inputs. These local magnetic field value and accurate ring energies, together with NIST database, are now defaults in the newest release of LEX-D, version 7.61. Three dimensional simulations of the temperature distributions in the aluminum calorimeter block for a typical ALS power measurement were made with the ABAQUS code and found to be in good agreement with the experimental temperature data. As an application of the block calorimetry technique, the X-ray power exiting the mirror in place at a LIGA scanner located at the APS beamline 10 BM was measured with a calorimeter similar to the one used at the ALS. The overall results at the APS demonstrated the utility of calorimetry in helping to characterize the total X-ray power in LIGA beamlines. In addition to the block calorimetry work at the ALS and APS, a preliminary comparison of the use of heat flux sensors, photodiodes and modified beam calorimeters as total X-ray power

  13. Accuracy of critical-temperature sensitivity coefficients predicted by multilayered composite plate theories

    Science.gov (United States)

    Noor, Ahmed K.; Burton, Scott

    1992-01-01

    An assessment is made of the accuracy of the critical-temperature sensitivity coefficients of multilayered plates predicted by different modeling approaches, based on two-dimensional shear-deformation theories. The sensitivity coefficients considered measure the sensitivity of the critical temperatures to variations in different lamination and material parameters of the plate. The standard of comparison is taken to be the sensitivity coefficients obtained by the three-dimensional theory of thermoelasticity. Numerical studies are presented showing the effects of variation in the geometric and lamination parameters of the plate on the accuracy of both the sensitivity coefficients and the critical temperatures predicted by the different modeling approaches.

  14. Classification Consistency and Accuracy for Complex Assessments Using Item Response Theory

    Science.gov (United States)

    Lee, Won-Chan

    2010-01-01

    In this article, procedures are described for estimating single-administration classification consistency and accuracy indices for complex assessments using item response theory (IRT). This IRT approach was applied to real test data comprising dichotomous and polytomous items. Several different IRT model combinations were considered. Comparisons…

  15. Final-part metrology for LIGA springs, Build Group 1.

    Energy Technology Data Exchange (ETDEWEB)

    Aigeldinger, Georg; Skala, Dawn M.; Ceremuga, Joseph T.; Mills, Bernice E.

    2004-03-01

    The LIGA spring is a recently designed part for defense program applications. The Sandia California LIGA team has produced an initial group build of these nickel alloy parts. These are distinctive in having a macroscopic lateral size of about 1 cm, while requiring microscopic dimensional precision on the order of a few micrometers. LIGA technology capabilities at Sandia are able to manufacture such precise structures. While certain aspects of the LIGA process and its production capabilities have been dimensionally characterized in the past, [1-6] the present work is exclusive in defining a set of methods and techniques to inspect and measure final LIGA nickel alloy parts in large prototype quantities. One hundred percent inspection, meaning that every single LIGA part produced needs to be measured, ensures quality control and customer satisfaction in this prototype production run. After a general visual inspection of the parts and an x-ray check for voids, high precision dimensional metrology tools are employed. The acquired data is analyzed using both in house and commercially available software. Examples of measurements illustrating these new metrology capabilities are presented throughout the report. These examples furthermore emphasize that thorough inspection of every final part is not only essential to characterize but also improve the LIGA manufacturing process.

  16. Miniature Scroll Pumps Fabricated by LIGA

    Science.gov (United States)

    Wiberg, Dean; Shcheglov, Kirill; White, Victor; Bae, Sam

    2009-01-01

    Miniature scroll pumps have been proposed as roughing pumps (low - vacuum pumps) for miniature scientific instruments (e.g., portable mass spectrometers and gas analyzers) that depend on vacuum. The larger scroll pumps used as roughing pumps in some older vacuum systems are fabricated by conventional machining. Typically, such an older scroll pump includes (1) an electric motor with an eccentric shaft to generate orbital motion of a scroll and (2) conventional bearings to restrict the orbital motion to a circle. The proposed miniature scroll pumps would differ from the prior, larger ones in both design and fabrication. A miniature scroll pump would include two scrolls: one mounted on a stationary baseplate and one on a flexure stage (see figure). An electromagnetic actuator in the form of two pairs of voice coils in a push-pull configuration would make the flexure stage move in the desired circular orbit. The capacitance between the scrolls would be monitored to provide position (gap) feedback to a control system that would adjust the drive signals applied to the voice coils to maintain the circular orbit as needed for precise sealing of the scrolls. To minimize power consumption and maximize precision of control, the flexure stage would be driven at the frequency of its mechanical resonance. The miniaturization of these pumps would entail both operational and manufacturing tolerances of pump components. In addition, the vibrations of conventional motors and ball bearings exceed these tight tolerances by an order of magnitude. Therefore, the proposed pumps would be fabricated by the microfabrication method known by the German acronym LIGA ( lithographie, galvanoformung, abformung, which means lithography, electroforming, molding) because LIGA has been shown to be capable of providing the required tolerances at large aspect ratios.

  17. LIGA-fabricated compact mm-wave linear accelerator cavities.

    Energy Technology Data Exchange (ETDEWEB)

    Song, J.J.; Bajikar, S.S.; DeCarlo, F.; Kang, Y.W.; Kustom, R.L.; Mancini, D.C.; Nassiri, A.; Lai, B.; Feinerman, A.D.; White, V.

    1998-03-23

    Millimeter-wave rf cavities for use in linear accelerators, free-electron lasers, and mm-wave undulatory are under development at Argonne National Laboratory. Typical cavity dimensions are in the 1000 mm range, and the overall length of the accelerator structure, which consists of 30-100 cavities, is about 50-100 mm. An accuracy of 0.2% in the cavity dimensions is necessary in order to achieve a high Q-factor of the cavity. To achieve this these structures are being fabricated using deep X-ray lithography, electroforming, and assembly (LIGA). The first prototype cavity structures are designed for 108 GHz and 2p/3-mode operation. Input and output couplers are integrated with the cavity structures. The cavities are fabricated on copper substrates by electroforming copper into 1-mm-thick PMMA resists patterned by deep x-ray lithography and polishing the copper down to the desired thickness. These are fabricated separately and subsequently assembled with precision spacing and alignment using microspheres, optical fibers, or microfabricated spacers/alignment pieces. Details of the fabrication process, alignment, and assembly work are presented in here.

  18. Ureteric Injury due to the Use of LigaSure

    Directory of Open Access Journals (Sweden)

    Muazzam Tahir

    2013-01-01

    Full Text Available Background. LigaSure is a bipolar clamping device used in open and laparoscopic surgeries for producing haemostasis in vascular pedicles up to 7 mm in diameter (“Covidien LigaSure technology: consistent, reliable, trusted vessel sealing,” 2012. The use of LigaSure has made securing haemostasis and tissue dissection relatively easy especially in laparoscopic surgery; however, if not used with care it can cause damage to the surrounding structures through lateral spread of energy. Case Report. This case report discusses the induction of a thermal ureteral injury associated with the use of LigaSure. An 80-year-old gentleman was operated for bowel cancer. LigaSure was used for securing haemostasis and tissue dissection. Postoperatively, he was found to have damage to the right ureter secondary to lateral spread of energy from the jaws of LigaSure with high abdominal drain output. Conclusion. Judicious and careful use of electrosurgical devices should be done to prevent inadvertent damage to the surrounding structures. Early recognition and involvement of a urologist can prevent long-term complications.

  19. Study on the accuracy of comprehensive evaluating method based on fuzzy set theory

    Institute of Scientific and Technical Information of China (English)

    Xu Weixiang; Liu Xumin

    2005-01-01

    The evaluation method and its accuracy for evaluating complex systems are considered. In order to evaluate accurately complex systems, the existed evaluating methods are simply analyzed, and a new comprehensive evaluating method is developed. The new method is integration of Delphi approach, analytic hierarchy process, gray interconnect degree and fuzzy evaluation (DHGF). Its theory foundation is the meta-synthesis methodology from qualitative analysis to quantitative analysis. According to fuzzy set approach, using the methods of concordance of evaluation, redundant verify, double models redundant, and limitations of the method etc, the accuracy of evaluating method of DHGF is estimated, and a practical example is given. The result shows that using the method to evaluate complex system projects is feasible and credible.

  20. Is the Accuracy of Density Functional Theory for Atomization Energies and Densities in Bonding Regions Correlated?

    Science.gov (United States)

    Brorsen, Kurt R; Yang, Yang; Pak, Michael V; Hammes-Schiffer, Sharon

    2017-05-04

    The development of approximate exchange-correlation functionals is critical for modern density functional theory. A recent analysis of atomic systems suggested that some modern functionals are straying from the path toward the exact functional because electron densities are becoming less accurate while energies are becoming more accurate since the year 2000. To investigate this trend for more chemically relevant systems, the electron densities in the bonding regions and the atomization energies are analyzed for a series of diatomic molecules with 90 different functionals. For hybrid generalized gradient approximation functionals developed since the year 2000, the errors in densities and atomization energies are decoupled; the accuracy of the energies remains relatively consistent while the accuracy of the densities varies significantly. Such decoupling is not observed for generalized gradient and meta-generalized gradient approximation functionals. Analysis of electron densities in bonding regions is found to be important for the evaluation of functionals for chemical systems.

  1. Improving the accuracy of density-functional theory calculation: the genetic algorithm and neural network approach.

    Science.gov (United States)

    Li, Hui; Shi, LiLi; Zhang, Min; Su, Zhongmin; Wang, XiuJun; Hu, LiHong; Chen, GuanHua

    2007-04-14

    The combination of genetic algorithm and neural network approach (GANN) has been developed to improve the calculation accuracy of density functional theory. As a demonstration, this combined quantum mechanical calculation and GANN correction approach has been applied to evaluate the optical absorption energies of 150 organic molecules. The neural network approach reduces the root-mean-square (rms) deviation of the calculated absorption energies of 150 organic molecules from 0.47 to 0.22 eV for the TDDFTB3LYP6-31G(d) calculation, and the newly developed GANN correction approach reduces the rms deviation to 0.16 eV.

  2. Improving the accuracy of Møller-Plesset perturbation theory with neural networks

    Science.gov (United States)

    McGibbon, Robert T.; Taube, Andrew G.; Donchev, Alexander G.; Siva, Karthik; Hernández, Felipe; Hargus, Cory; Law, Ka-Hei; Klepeis, John L.; Shaw, David E.

    2017-10-01

    Noncovalent interactions are of fundamental importance across the disciplines of chemistry, materials science, and biology. Quantum chemical calculations on noncovalently bound complexes, which allow for the quantification of properties such as binding energies and geometries, play an essential role in advancing our understanding of, and building models for, a vast array of complex processes involving molecular association or self-assembly. Because of its relatively modest computational cost, second-order Møller-Plesset perturbation (MP2) theory is one of the most widely used methods in quantum chemistry for studying noncovalent interactions. MP2 is, however, plagued by serious errors due to its incomplete treatment of electron correlation, especially when modeling van der Waals interactions and π-stacked complexes. Here we present spin-network-scaled MP2 (SNS-MP2), a new semi-empirical MP2-based method for dimer interaction-energy calculations. To correct for errors in MP2, SNS-MP2 uses quantum chemical features of the complex under study in conjunction with a neural network to reweight terms appearing in the total MP2 interaction energy. The method has been trained on a new data set consisting of over 200 000 complete basis set (CBS)-extrapolated coupled-cluster interaction energies, which are considered the gold standard for chemical accuracy. SNS-MP2 predicts gold-standard binding energies of unseen test compounds with a mean absolute error of 0.04 kcal mol-1 (root-mean-square error 0.09 kcal mol-1), a 6- to 7-fold improvement over MP2. To the best of our knowledge, its accuracy exceeds that of all extant density functional theory- and wavefunction-based methods of similar computational cost, and is very close to the intrinsic accuracy of our benchmark coupled-cluster methodology itself. Furthermore, SNS-MP2 provides reliable per-conformation confidence intervals on the predicted interaction energies, a feature not available from any alternative method.

  3. Inspection strategy for LIGA microstructures using a programmable optical microscope.

    Energy Technology Data Exchange (ETDEWEB)

    Kurfess, Thomas R (Georgia Institute of Technology, Atlanta, GA); Aigeldinger, Georg; Ceremuga, Joseph T.

    2004-07-01

    The LIGA process has the ability to fabricate very precise, high aspect ratio mesoscale structures with microscale features [l]. The process consists of multiple steps before a final part is produced. Materials native to the LIGA process include metals and photoresists. These structures are routinely measured for quality control and process improvement. However, metrology of LIGA structures is challenging because of their high aspect ratio and edge topography. For the scale of LIGA structures, a programmable optical microscope is well suited for lateral (XU) critical dimension measurements. Using grayscale gradient image processing with sub-pixel interpolation, edges are detected and measurements are performed. As with any measurement, understanding measurement uncertainty is necessary so that appropriate conclusions are drawn from the data. Therefore, the abilities of the inspection tool and the obstacles presented by the structures under inspection should be well understood so that precision may be quantified. This report presents an inspection method for LIGA microstructures including a comprehensive assessment of the uncertainty for each inspection scenario.

  4. Torsion Testing of Diffusion Bonded LIGA Formed Nickel

    Energy Technology Data Exchange (ETDEWEB)

    Buchheit, T.E.; Christenson, T.R.; Schmale, D.T.

    1999-01-27

    A test technique has been devised which is suitable for the testing of the bond strength of batch diffusion bonded LIGA or DXRL defined structures. The method uses a torsion tester constructed with the aid of LIGA fabrication and distributed torsion specimens which also make use of the high aspect ratio nature of DXRL based processing. Measurements reveal achieved bond strengths of 130MPa between electroplated nickel with a bond temperature of 450 C at 7 ksi pressure which is a sufficiently low temperature to avoid mechanical strength degradation.

  5. Applying signal-detection theory to the study of observer accuracy and bias in behavioral assessment.

    Science.gov (United States)

    Lerman, Dorothea C; Tetreault, Allison; Hovanetz, Alyson; Bellaci, Emily; Miller, Jonathan; Karp, Hilary; Mahmood, Angela; Strobel, Maggie; Mullen, Shelley; Keyl, Alice; Toupard, Alexis

    2010-01-01

    We evaluated the feasibility and utility of a laboratory model for examining observer accuracy within the framework of signal-detection theory (SDT). Sixty-one individuals collected data on aggression while viewing videotaped segments of simulated teacher-child interactions. The purpose of Experiment 1 was to determine if brief feedback and contingencies for scoring accurately would bias responding reliably. Experiment 2 focused on one variable (specificity of the operational definition) that we hypothesized might decrease the likelihood of bias. The effects of social consequences and information about expected behavior change were examined in Experiment 3. Results indicated that feedback and contingencies reliably biased responding and that the clarity of the definition only moderately affected this outcome.

  6. Improved Accuracy of Density Functional Theory Calculations for CO2 Reduction and Metal-Air Batteries

    DEFF Research Database (Denmark)

    Christensen, Rune; Hansen, Heine Anton; Vegge, Tejs

    2015-01-01

    through first principle methods. Ensembles generated using a Bayesian error estimation functional, in this case the BEEF-vdW functional[6], are used for the error identification. The ensembles, which consist of perturbations of the main van der Waals density functional, can be generated at low......Density functional theory (DFT) calculations have greatly contributed to the atomic level understanding of electrochemical reactions. However, in some cases, the accuracy can be prohibitively low for a detailed understanding of, e.g. reaction mechanisms. Two cases are examined here, i...... that the systematic error is due to carbon-oxygen double bonds, as the change in number of carbon-oxygen double bonds in the reaction to methanol is two as compared to one for reaction to formic acid. This is subsequently confirmed by further comparisons of functional dependence and a significant source of systematic...

  7. Correlation Matrix Renormalization Theory: Improving Accuracy with Two-Electron Density-Matrix Sum Rules.

    Science.gov (United States)

    Liu, C; Liu, J; Yao, Y X; Wu, P; Wang, C Z; Ho, K M

    2016-10-11

    We recently proposed the correlation matrix renormalization (CMR) theory to treat the electronic correlation effects [Phys. Rev. B 2014, 89, 045131 and Sci. Rep. 2015, 5, 13478] in ground state total energy calculations of molecular systems using the Gutzwiller variational wave function (GWF). By adopting a number of approximations, the computational effort of the CMR can be reduced to a level similar to Hartree-Fock calculations. This paper reports our recent progress in minimizing the error originating from some of these approximations. We introduce a novel sum-rule correction to obtain a more accurate description of the intersite electron correlation effects in total energy calculations. Benchmark calculations are performed on a set of molecules to show the reasonable accuracy of the method.

  8. A model for reaction-assisted polymer dissolution in LIGA.

    Energy Technology Data Exchange (ETDEWEB)

    Larson, Richard S.

    2004-05-01

    A new chemically-oriented mathematical model for the development step of the LIGA process is presented. The key assumption is that the developer can react with the polymeric resist material in order to increase the solubility of the latter, thereby partially overcoming the need to reduce the polymer size. The ease with which this reaction takes place is assumed to be determined by the number of side chain scissions that occur during the x-ray exposure phase of the process. The dynamics of the dissolution process are simulated by solving the reaction-diffusion equations for this three-component, two-phase system, the three species being the unreacted and reacted polymers and the solvent. The mass fluxes are described by the multicomponent diffusion (Stefan-Maxwell) equations, and the chemical potentials are assumed to be given by the Flory-Huggins theory. Sample calculations are used to determine the dependence of the dissolution rate on key system parameters such as the reaction rate constant, polymer size, solid-phase diffusivity, and Flory-Huggins interaction parameters. A simple photochemistry model is used to relate the reaction rate constant and the polymer size to the absorbed x-ray dose. The resulting formula for the dissolution rate as a function of dose and temperature is ?t to an extensive experimental data base in order to evaluate a set of unknown global parameters. The results suggest that reaction-assisted dissolution is very important at low doses and low temperatures, the solubility of the unreacted polymer being too small for it to be dissolved at an appreciable rate. However, at high doses or at higher temperatures, the solubility is such that the reaction is no longer needed, and dissolution can take place via the conventional route. These results provide an explanation for the observed dependences of both the dissolution rate and its activation energy on the absorbed dose.

  9. Development of a LIGA-based elastodynamic flying mechanism

    Science.gov (United States)

    Cox, Adam G.; Garcia, Ephrahim

    1998-07-01

    With the emergence of MEMS and LIGA technology piezoceramics can be integrated to create tiny solid state devices. The precision motion that piezoelectric materials can provide is complimented by the tolerances that can be achieved through MEMS and LIGA micromachining. The integration of these two technologies is ideal for microactuation. A LIGA based devices has been developed that is capable of amplifying small motions from a piezoelectric element into an output stroke angle large enough to produce flight. Micro flight is a difficult aerodynamic problem. With small wing areas conventional lift requires velocities that are difficult to achieve. However it is possible to induce lift using drag in the same manner as some birds and insects. Flapping is a highly efficient way to produce flight. For sustained low energy flight both insects and birds use a complex elastodynamic system that only requires them to excite it at its natural frequency. The actuation device presented is based on the same flight principle of insects and birds, a resonating elastodynamic system excited at its natural frequency or at a lower harmonic. This allows for long distance flights that require little energy. Piezoceramics posses a high energy level and force output that can excite the device and induce a flapping motion. The dynamics of the system rely on the LIGA flexure mechanism, the piezoelectric element, as well as the aerodynamic interaction of the wing and the air which is a complex nonlinear problem.

  10. Assessing the accuracy of approximate treatments of ion hydration based on primitive quasichemical theory

    Science.gov (United States)

    Roux, Benoît; Yu, Haibo

    2010-06-01

    Quasichemical theory (QCT) provides a framework that can be used to partition the influence of the solvent surrounding an ion into near and distant contributions. Within QCT, the solvation properties of the ion are expressed as a sum of configurational integrals comprising only the ion and a small number of solvent molecules. QCT adopts a particularly simple form if it is assumed that the clusters undergo only small thermal fluctuations around a well-defined energy minimum and are affected exclusively in a mean-field sense by the surrounding bulk solvent. The fluctuations can then be integrated out via a simple vibrational analysis, leading to a closed-form expression for the solvation free energy of the ion. This constitutes the primitive form of quasichemical theory (pQCT), which is an approximate mathematical formulation aimed at reproducing the results from the full many-body configurational averages of statistical mechanics. While the results from pQCT from previous applications are reasonable, the accuracy of the approach has not been fully characterized and its range of validity remains unclear. Here, a direct test of pQCT for a set of ion models is carried out by comparing with the results of free energy simulations with explicit solvent. The influence of the distant surrounding bulk on the cluster comprising the ion and the nearest solvent molecule is treated both with a continuum dielectric approximation and with free energy perturbation molecular dynamics simulations with explicit solvent. The analysis shows that pQCT can provide an accurate framework in the case of a small cation such as Li+. However, the approximation encounters increasing difficulties when applied to larger cations such as Na+, and particularly for K+. This suggests that results from pQCT should be interpreted with caution when comparing ions of different sizes.

  11. MAPPING SPATIAL ACCURACY AND ESTIMATING LANDSCAPE INDICATORS FROM THEMATIC LAND COVER MAPS USING FUZZY SET THEORY

    Science.gov (United States)

    The accuracy of thematic map products is not spatially homogenous, but instead variable across most landscapes. Properly analyzing and representing the spatial distribution (pattern) of thematic map accuracy would provide valuable user information for assessing appropriate applic...

  12. Confinement-Higgs transition in a disordered gauge theory and the accuracy threshold for quantum memory

    CERN Document Server

    Wang, C; Wang, Chenyang; Preskill, John

    2003-01-01

    We study the +/- J random-plaquette Z_2 gauge model (RPGM) in three spatial dimensions, a three-dimensional analog of the two-dimensional +/- J random-bond Ising model (RBIM). The model is a pure Z_2 gauge theory in which randomly chosen plaquettes (occuring with concentration p) have couplings with the ``wrong sign'' so that magnetic flux is energetically favored on these plaquettes. Excitations of the model are one-dimensional ``flux tubes'' that terminate at ``magnetic monopoles.'' Electric confinement can be driven by thermal fluctuations of the flux tubes, by the quenched background of magnetic monopoles, or by a combination of the two. Like the RBIM, the RPGM has enhanced symmetry along a ``Nishimori'' line in the p-T plane (where T is the temperature). The critical concentration p_c of wrong-sign plaquettes at the confinement-Higgs phase transition along the Nishimori line can be identified with the accuracy threshold for robust storage of quantum information using topological error-correcting codes: i...

  13. Accuracy of Pseudo-Inverse Covariance Learning--A Random Matrix Theory Analysis.

    Science.gov (United States)

    Hoyle, David C

    2011-07-01

    For many learning problems, estimates of the inverse population covariance are required and often obtained by inverting the sample covariance matrix. Increasingly for modern scientific data sets, the number of sample points is less than the number of features and so the sample covariance is not invertible. In such circumstances, the Moore-Penrose pseudo-inverse sample covariance matrix, constructed from the eigenvectors corresponding to nonzero sample covariance eigenvalues, is often used as an approximation to the inverse population covariance matrix. The reconstruction error of the pseudo-inverse sample covariance matrix in estimating the true inverse covariance can be quantified via the Frobenius norm of the difference between the two. The reconstruction error is dominated by the smallest nonzero sample covariance eigenvalues and diverges as the sample size becomes comparable to the number of features. For high-dimensional data, we use random matrix theory techniques and results to study the reconstruction error for a wide class of population covariance matrices. We also show how bagging and random subspace methods can result in a reduction in the reconstruction error and can be combined to improve the accuracy of classifiers that utilize the pseudo-inverse sample covariance matrix. We test our analysis on both simulated and benchmark data sets.

  14. UV-LIGA microfabrication process for sub-terahertz waveguides utilizing multiple layered SU-8 photoresist

    Science.gov (United States)

    Malekabadi, Ali; Paoloni, Claudio

    2016-09-01

    A microfabrication process based on UV LIGA (German acronym of lithography, electroplating and molding) is proposed for the fabrication of relatively high aspect ratio sub-terahertz (100-1000 GHz) metal waveguides, to be used as a slow wave structure in sub-THz vacuum electron devices. The high accuracy and tight tolerances required to properly support frequencies in the sub-THz range can be only achieved by a stable process with full parameter control. The proposed process, based on SU-8 photoresist, has been developed to satisfy high planar surface requirements for metal sub-THz waveguides. It will be demonstrated that, for a given thickness, it is more effective to stack a number of layers of SU-8 with lower thickness rather than using a single thick layer obtained at lower spin rate. The multiple layer approach provides the planarity and the surface quality required for electroforming of ground planes or assembly surfaces and for assuring low ohmic losses of waveguides. A systematic procedure is provided to calculate soft and post-bake times to produce high homogeneity SU-8 multiple layer coating as a mold for very high quality metal waveguides. A double corrugated waveguide designed for 0.3 THz operating frequency, to be used in vacuum electronic devices, was fabricated as test structure. The proposed process based on UV LIGA will enable low cost production of high accuracy sub-THz 3D waveguides. This is fundamental for producing a new generation of affordable sub-THz vacuum electron devices, to fill the technological gap that still prevents a wide diffusion of numerous applications based on THz radiation.

  15. MAPPING SPATIAL ACCURACY AND ESTIMATING LANDSCAPE INDICATORS FROM THEMATIC LAND COVER MAPS USING FUZZY SET THEORY

    Science.gov (United States)

    This paper presents a fuzzy set-based method of mapping spatial accuracy of thematic map and computing several ecological indicators while taking into account spatial variation of accuracy associated with different land cover types and other factors (e.g., slope, soil type, etc.)...

  16. Estudo da adesão liga (Ni-Cr)-porcelana em protese dentaria

    OpenAIRE

    Beatriz Luci Fernandes

    1992-01-01

    Resumo: Este trabalho _em como objetivo principal o estudo da adesão entre ligas niquel-cromo e porcelana. utilizadas na confecção de próteses odontológicas. Para tanto foi efetuada uma revisão bibliográfica detalhada sobre o desenvolvimento dessas próteses. Foram selecionadas para o estudo duas ligas Ni-Cr comerciais. Uma delas contendo pequeno teor de Be. E uma porcelana. Os seguintes ensaios foram realizados: dureza. Análise microestrutural das ligas e da interface liga-porcelana através ...

  17. Predicting behaviour from perceived behavioural control: tests of the accuracy assumption of the theory of planned behaviour.

    Science.gov (United States)

    Sheeran, Paschal; Trafimow, David; Armitage, Christopher J

    2003-09-01

    The theory of planned behaviour assumes that the accuracy of perceived behavioural control (PBC) determines the strength of the PBC-behaviour relationship. However, this assumption has never been formally tested. The present research developed and validated a proxy measure of actual control (PMAC) in order to test the assumption. In two studies, participants completed measures of intention and PBC, and subsequently completed measures of behaviour and the PMAC. Validity of the PMAC was established by findings showing; (a). that the PMAC moderated the intention-behaviour relation, and (b). that PMAC scores did not reflect attributions for participants' failure to enact their stated intentions. Accuracy was operationalized as the difference between PBC and PMAC scores. Consistent with theoretical expectations, several analyses indicated that greater accuracy of PBC was associated with improved prediction of behaviour by PBC.

  18. Serotonin and Dopamine Gene Variation and Theory of Mind Decoding Accuracy in Major Depression: A Preliminary Investigation.

    Directory of Open Access Journals (Sweden)

    Arielle Y Zahavi

    Full Text Available Theory of mind-the ability to decode and reason about others' mental states-is a universal human skill and forms the basis of social cognition. Theory of mind accuracy is impaired in clinical conditions evidencing social impairment, including major depressive disorder. The current study is a preliminary investigation of the association of polymorphisms of the serotonin transporter (SLC6A4, dopamine transporter (DAT1, dopamine receptor D4 (DRD4, and catechol-O-methyl transferase (COMT genes with theory of mind decoding in a sample of adults with major depression. Ninety-six young adults (38 depressed, 58 non-depressed completed the 'Reading the Mind in the Eyes task' and a non-mentalistic control task. Genetic associations were only found for the depressed group. Specifically, superior accuracy in decoding mental states of a positive valence was seen in those homozygous for the long allele of the serotonin transporter gene, 9-allele carriers of DAT1, and long-allele carriers of DRD4. In contrast, superior accuracy in decoding mental states of a negative valence was seen in short-allele carriers of the serotonin transporter gene and 10/10 homozygotes of DAT1. Results are discussed in terms of their implications for integrating social cognitive and neurobiological models of etiology in major depression.

  19. LigaSure small jaws versus cold knife dissection in superficial parotidectomy

    DEFF Research Database (Denmark)

    Hahn, Christoffer Holst; Sørensen, Christian Hjort

    2013-01-01

    The objective of this study was to evaluate the use of LigaSure small jaws in superficial parotidectomy for blood loss, operative time and facial nerve function. This was a prospective non-randomized study of 35 patients with a benign parotid tumor. Sixteen patients had LigaSure small jaws paroti...

  20. Ligas Finemet nanocristalizadas a partir de precursores amorfos

    Directory of Open Access Journals (Sweden)

    Neide Aparecida Mariano

    2004-06-01

    Full Text Available Atualmente, há muito interesse no desenvolvimento de materiais nanocristalinos e amorfos, que apresentem alta resistência mecânica combinada com boa ductilidade, abrindo grandes perspectivas tecnológicas para o processamento desses materiais. Devido a sua versatilidade, as ligas amorfas têm mostrado ter propriedades que podem ser utilizadas em diversas áreas, como em memórias de computadores, aplicações em vários tipos de transformadores para potência e usos eletrônicos. A técnica para obter as ligas amorfas utilizada nesse trabalho foi a de solidificação rápida a partir do estado líquido, por melt spinning. O processamento das fitas foi efetuado em duas etapas, inicialmente foi realizado a fusão da liga por indução magnética, posteriormente, a liga foi submetida a nova refusão para melhorar a homogeneização e, em seguida, produziu-se a fita metálica amorfa, utilizando uma taxa de resfriamento em torno de 10³°C/s. Durante o processamento, a fita obtida apresentou-se amorfa e com uma espessura em torno de 25µm.Now, there is a lot of interest in the development of nanocrystalline and amorphous materials, that present high mechanical resistance combined with good ductility, opening great technological perspectives for the processing these of materials. Due to its versatility, the amorphous alloys have been showing to have properties that can be used in several areas, as in memory of computers, applications in several types of transformers for potency and electronic uses. The technique used to obtain of amorphous alloys in this work, it went to of rapid solidification starting from the liquid state, for melt spinning. The processing of the ribbons of was made in two stages, initially the coalition of the alloy was accomplished by magnetic induction, later on, the alloy was submitted the new remelting to improve the homogenizationand soon after, the amorphous metallic ribbon was produced, used of the high cooling rate

  1. Miniature Inchworm Actuators Fabricated by Use of LIGA

    Science.gov (United States)

    Yang, Eui-Hyeok

    2003-01-01

    Miniature inchworm actuators that would have relatively simple designs have been proposed for applications in which there are requirements for displacements of the order of microns or tens of microns and for the ability to hold their positions when electric power is not applied. The proposed actuators would be members of the class of microelectromechanical systems (MEMS), but would be designed and fabricated following an approach that is somewhat unusual for MEMS. Like other MEMS actuators, the proposed inchworm actuators could utilize thermoplastic, bimetallic, shape-memory-alloy, or piezoelectric actuation principles. The figure depicts a piezoelectric inchworm actuator according to the proposal. As in other inchworm actuators, linear motion of an extensible member would be achieved by lengthening and shortening the extensible member in synchronism with alternately clamping and releasing one and then the other end of the member. In this case, the moving member would be the middle one; the member would be piezoelectric and would be shortened by applying a voltage to it. The two outer members would also be piezoelectric; the release of the clamps on the upper or lower end would be achieved by applying a voltage to the electrodes on the upper or lower ends, respectively, of these members. Usually, MEMS actuators cannot be fabricated directly on the side walls of silicon wafers, yet the geometry of this actuator necessitates such fabrication. The solution, according to the proposal, would be to use the microfabrication technique known by the German acronym LIGA - "lithographie, galvanoformung, abformung," which means lithography, electroforming, molding. LIGA involves x-ray lithography of a polymer film followed by selective removal of material to form a three-dimensional pattern from which a mold is made. Among the advantages of LIGA for this purpose are that it is applicable to a broad range of materials, can be used to implement a variety of designs, including

  2. Preliminary design of multi-function LIGA beamline

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    One design of multi-function LIGA beamline has been reported. In this design, two plane mirrors and a series of filters have been employed. One can choose the spectrum range of X-ray easily according to the exposure requirement by adjusting the grazing angle of mirrors and the thickness of filters. And the spot size in the horizontal direction is up to 120mm, which is large enough for exposing 5 inch silicon slice. The typical exposure time is about 1.2h, 1.8h, 0.5h, corresponding to PMMA thickness of 500 μ m, 200 μ m, 20 t m, respectively.

  3. Liga química magnesia-fosfato

    OpenAIRE

    Hipedinger, Nora Elba

    2007-01-01

    Esta tesis es un estudio científico-tecnológico sobre la aplicación de la liga química magnesia-fosfato a los materiales refractarios de base cordierita. Estos materiales son extensamente usados en aplicaciones de alta temperatura que requieran baja expansión térmica, buenas propiedades termomecánicas y excelente resistencia al choque térmico (por ejemplo: moblaje de hornos, quemadores de gas, soporte de elementos calefactores, partes de turbinas, bujías, soportes de catalizadores, etc.). En ...

  4. Determination of the QCD Λ Parameter and the Accuracy of Perturbation Theory at High Energies.

    Science.gov (United States)

    Dalla Brida, Mattia; Fritzsch, Patrick; Korzec, Tomasz; Ramos, Alberto; Sint, Stefan; Sommer, Rainer

    2016-10-28

    We discuss the determination of the strong coupling α_{MS[over ¯]}(m_{Z}) or, equivalently, the QCD Λ parameter. Its determination requires the use of perturbation theory in α_{s}(μ) in some scheme s and at some energy scale μ. The higher the scale μ, the more accurate perturbation theory becomes, owing to asymptotic freedom. As one step in our computation of the Λ parameter in three-flavor QCD, we perform lattice computations in a scheme that allows us to nonperturbatively reach very high energies, corresponding to α_{s}=0.1 and below. We find that (continuum) perturbation theory is very accurate there, yielding a 3% error in the Λ parameter, while data around α_{s}≈0.2 are clearly insufficient to quote such a precision. It is important to realize that these findings are expected to be generic, as our scheme has advantageous properties regarding the applicability of perturbation theory.

  5. Hospital status admission determination: the use of Boolean logic, set theory, and information theory to improve accuracy.

    Science.gov (United States)

    Cohen, Daniel H

    2012-01-01

    To evaluate methods of logic, set theory, and information theory in developing a conceptual framework that would be useful in an educational process as well as in developing a consistent and rational method for hospital status determination. To implement these methods on a daily basis in interaction with nurse case managers, physicians, and in documentation of the process. A tertiary private, not-for-profit institution within the department of case management and utilization review. These methods were well accepted by those involved in the decision process and allowed a Case Management Assignment Protocol to function well in the hospital environment with a low level of disagreement and conflict. Medical information can be processed effectively with conceptual models of logic and information theory. The used commercial screening systems are described well by set theory and are intersecting sets of patient variables and characteristics. These methods can be used in educational processes in practice settings apart from those using the Case Management Assignment Protocol. It provides a basis for evaluation of patients' presentations that use important factors such as clinical uncertainty, patient specific data, and reference to preexisting admission criteria.

  6. Recent advances in electronic structure theory and their influence on the accuracy of ab initio potential energy surfaces

    Science.gov (United States)

    Bauschlicher, Charles W., Jr.; Langhoff, Stephen R.; Taylor, Peter R.

    1989-01-01

    Recent advances in electronic structure theory and the availability of high speed vector processors have substantially increased the accuracy of ab initio potential energy surfaces. The recently developed atomic natural orbital approach for basis set contraction has reduced both the basis set incompleteness and superposition errors in molecular calculations. Furthermore, full CI calculations can often be used to calibrate a CASSCF/MRCI approach that quantitatively accounts for the valence correlation energy. These computational advances also provide a vehicle for systematically improving the calculations and for estimating the residual error in the calculations. Calculations on selected diatomic and triatomic systems will be used to illustrate the accuracy that currently can be achieved for molecular systems. In particular, the F + H2 yields HF + H potential energy hypersurface is used to illustrate the impact of these computational advances on the calculation of potential energy surfaces.

  7. Accuracy of Enskog theory for rotational versus translational motion: A molecular-dynamics study

    NARCIS (Netherlands)

    Talbot, J.; Allen, M.P.; Evans, G.T.; Frenkel, D.; Kivelson, D.

    1989-01-01

    Molecular-dynamics simulations of fluids composed of hard ellipsoids yield translational diffusional coefficients that deviate from the predictions of kinetic theory in the same way, but to a greater degree than, those of hard spheres. Surprisingly, however, the rotational diffusion coefficients are

  8. Determination of the QCD Λ-parameter and the accuracy of perturbation theory at high energies

    Energy Technology Data Exchange (ETDEWEB)

    Dalla Brida, Mattia [Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany). John von Neumann-Inst. fuer Computing NIC; Fritzsch, Patrick [Univ. Autonoma de Madrid (Spain). Inst. de Fisica Teorica UAM/CSIC; Korzec, Tomasz [Wuppertal Univ. (Germany). Dept. of Physics; Ramos, Alberto [CERN - European Organization for Nuclear Research, Geneva (Switzerland). Theory Div.; Sint, Stefan [Trinity College Dublin (Ireland). School of Mathematics; Sommer, Rainer [Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany). John von Neumann-Inst. fuer Computing NIC; Humboldt-Universitaet, Berlin (Germany). Inst. fuer Physik; Collaboration: ALPHA Collaboration

    2016-04-15

    We discuss the determination of the strong coupling α{sub MS}(m{sub Z}) or equivalently the QCD Λ-parameter. Its determination requires the use of perturbation theory in α{sub s}(μ) in some scheme, s, and at some energy scale μ. The higher the scale μ the more accurate perturbation theory becomes, owing to asymptotic freedom. As one step in our computation of the Λ-parameter in three-flavor QCD, we perform lattice computations in a scheme which allows us to non-perturbatively reach very high energies, corresponding to α{sub s}=0.1 and below. We find that (continuum) perturbation theory is very accurate there, yielding a three percent error in the Λ-parameter, while data around α{sub s}∼0.2 is clearly insufficient to quote such a precision. It is important to realize that these findings are expected to be generic, as our scheme has advantageous properties regarding the applicability of perturbation theory.

  9. Accuracy of Enskog theory for rotational versus translational motion: A molecular-dynamics study

    NARCIS (Netherlands)

    Talbot, J.; Allen, M.P.; Evans, G.T.; Frenkel, D.; Kivelson, D.

    1989-01-01

    Molecular-dynamics simulations of fluids composed of hard ellipsoids yield translational diffusional coefficients that deviate from the predictions of kinetic theory in the same way, but to a greater degree than, those of hard spheres. Surprisingly, however, the rotational diffusion coefficients are

  10. On the accuracy of the Timoshenko beam theory above the critical frequency: best shear coefficient

    CERN Document Server

    Franco-Villafañe, J A

    2014-01-01

    We obtain values for the shear coefficient both below and above the critical frequency, by comparing the results of the Timoshenko beam theory with experimental results published very recently. The best results are obtained when different values of the shear coefficient are used below and above the critical frequency.

  11. Boosting Accuracy of Classical Machine Learning Antispam Classifiers in Real Scenarios by Applying Rough Set Theory

    Directory of Open Access Journals (Sweden)

    N. Pérez-Díaz

    2016-01-01

    Full Text Available Nowadays, spam deliveries represent a major problem to benefit from the wide range of Internet-based communication forms. Despite the existence of different well-known intelligent techniques for fighting spam, only some specific implementations of Naïve Bayes algorithm are finally used in real environments for performance reasons. As long as some of these algorithms suffer from a large number of false positive errors, in this work we propose a rough set postprocessing approach able to significantly improve their accuracy. In order to demonstrate the advantages of the proposed method, we carried out a straightforward study based on a publicly available standard corpus (SpamAssassin, which compares the performance of previously successful well-known antispam classifiers (i.e., Support Vector Machines, AdaBoost, Flexible Bayes, and Naïve Bayes with and without the application of our developed technique. Results clearly evidence the suitability of our rough set postprocessing approach for increasing the accuracy of previous successful antispam classifiers when working in real scenarios.

  12. Accuracies of the empirical theories of the escape probability based on Eigen model and Braun model compared with the exact extension of Onsager theory.

    Science.gov (United States)

    Wojcik, Mariusz; Tachiya, M

    2009-03-14

    This paper deals with the exact extension of the original Onsager theory of the escape probability to the case of finite recombination rate at nonzero reaction radius. The empirical theories based on the Eigen model and the Braun model, which are applicable in the absence and presence of an external electric field, respectively, are based on a wrong assumption that both recombination and separation processes in geminate recombination follow exponential kinetics. The accuracies of the empirical theories are examined against the exact extension of the Onsager theory. The Eigen model gives the escape probability in the absence of an electric field, which is different by a factor of 3 from the exact one. We have shown that this difference can be removed by operationally redefining the volume occupied by the dissociating partner before dissociation, which appears in the Eigen model as a parameter. The Braun model gives the escape probability in the presence of an electric field, which is significantly different from the exact one over the whole range of electric fields. Appropriate modification of the original Braun model removes the discrepancy at zero or low electric fields, but it does not affect the discrepancy at high electric fields. In all the above theories it is assumed that recombination takes place only at the reaction radius. The escape probability in the case when recombination takes place over a range of distances is also calculated and compared with that in the case of recombination only at the reaction radius.

  13. On the accuracy of density functional theory and wave function methods for calculating vertical ionization energies

    Energy Technology Data Exchange (ETDEWEB)

    McKechnie, Scott [Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Booth, George H. [Theory and Simulation of Condensed Matter, King’s College London, The Strand, London WC2R 2LS (United Kingdom); Cohen, Aron J. [Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (United Kingdom); Cole, Jacqueline M., E-mail: jmc61@cam.ac.uk [Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Argonne National Laboratory, 9700 S Cass Avenue, Argonne, Illinois 60439 (United States)

    2015-05-21

    The best practice in computational methods for determining vertical ionization energies (VIEs) is assessed, via reference to experimentally determined VIEs that are corroborated by highly accurate coupled-cluster calculations. These reference values are used to benchmark the performance of density functional theory (DFT) and wave function methods: Hartree-Fock theory, second-order Møller-Plesset perturbation theory, and Electron Propagator Theory (EPT). The core test set consists of 147 small molecules. An extended set of six larger molecules, from benzene to hexacene, is also considered to investigate the dependence of the results on molecule size. The closest agreement with experiment is found for ionization energies obtained from total energy difference calculations. In particular, DFT calculations using exchange-correlation functionals with either a large amount of exact exchange or long-range correction perform best. The results from these functionals are also the least sensitive to an increase in molecule size. In general, ionization energies calculated directly from the orbital energies of the neutral species are less accurate and more sensitive to an increase in molecule size. For the single-calculation approach, the EPT calculations are in closest agreement for both sets of molecules. For the orbital energies from DFT functionals, only those with long-range correction give quantitative agreement with dramatic failing for all other functionals considered. The results offer a practical hierarchy of approximations for the calculation of vertical ionization energies. In addition, the experimental and computational reference values can be used as a standardized set of benchmarks, against which other approximate methods can be compared.

  14. On the accuracy of density functional theory and wave function methods for calculating vertical ionization energies

    Science.gov (United States)

    McKechnie, Scott; Booth, George H.; Cohen, Aron J.; Cole, Jacqueline M.

    2015-05-01

    The best practice in computational methods for determining vertical ionization energies (VIEs) is assessed, via reference to experimentally determined VIEs that are corroborated by highly accurate coupled-cluster calculations. These reference values are used to benchmark the performance of density functional theory (DFT) and wave function methods: Hartree-Fock theory, second-order Møller-Plesset perturbation theory, and Electron Propagator Theory (EPT). The core test set consists of 147 small molecules. An extended set of six larger molecules, from benzene to hexacene, is also considered to investigate the dependence of the results on molecule size. The closest agreement with experiment is found for ionization energies obtained from total energy difference calculations. In particular, DFT calculations using exchange-correlation functionals with either a large amount of exact exchange or long-range correction perform best. The results from these functionals are also the least sensitive to an increase in molecule size. In general, ionization energies calculated directly from the orbital energies of the neutral species are less accurate and more sensitive to an increase in molecule size. For the single-calculation approach, the EPT calculations are in closest agreement for both sets of molecules. For the orbital energies from DFT functionals, only those with long-range correction give quantitative agreement with dramatic failing for all other functionals considered. The results offer a practical hierarchy of approximations for the calculation of vertical ionization energies. In addition, the experimental and computational reference values can be used as a standardized set of benchmarks, against which other approximate methods can be compared.

  15. Accuracy of Petermann's K-factor in the theory of semiconductor lasers

    Energy Technology Data Exchange (ETDEWEB)

    El Mashade, M.B.; Arnaud, J.

    1986-04-01

    Petermann has proposed that the classical formula for the linewidth of a laser be multiplied by a factor K >> 1 in the case of gain-guided semiconductor lasers. The concept of power in the mode used by that author, however, is not well defined in a waveguide with gain, and his theory is therefore opened to question. The analysis given here avoids this difficulty and nevertheless agrees with Petermann's result. This is because spatial mode filtering is strong in oscillating lasers.

  16. LIGA-based microsystem manufacturing:the electrochemistry of through-mold depostion and material properties.

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, James J. (Sandia National Laboratories, Livermore, CA); Goods, Steven Howard (Sandia National Laboratories, Livermore, CA)

    2005-06-01

    The report presented below is to appear in ''Electrochemistry at the Nanoscale'', Patrik Schmuki, Ed. Springer-Verlag, (ca. 2005). The history of the LIGA process, used for fabricating dimensional precise structures for microsystem applications, is briefly reviewed, as are the basic elements of the technology. The principal focus however, is on the unique aspects of the electrochemistry of LIGA through-mask metal deposition and the generation of the fine and uniform microstructures necessary to ensure proper functionality of LIGA components. We draw from both previously published work by external researchers in the field as well as from published and unpublished studies from within Sandia.

  17. Uma contribuição ao estudo do torneamento da liga 625

    OpenAIRE

    Aristides Magri

    2015-01-01

    As indústrias automotivas, aeroespaciais e de energia vêm testemunhando uma maior procura por materiais para fabricação de componentes críticos, tais como ligas à base de titânio e à base de níquel, principalmente devido à alta relação resistência mecânica/peso e à capacidade de manter propriedades mecânicas em temperaturas elevadas e em ambientes corrosivos. Isto gerou a necessidade de se criarem modos economicamente viáveis para fabricar componentes que têm estas ligas por base. Ligas à bas...

  18. Balancing accuracy and efficiency in selecting vibrational configuration interaction basis states using vibrational perturbation theory

    Science.gov (United States)

    Sibaev, Marat; Crittenden, Deborah L.

    2016-08-01

    This work describes the benchmarking of a vibrational configuration interaction (VCI) algorithm that combines the favourable computational scaling of VPT2 with the algorithmic robustness of VCI, in which VCI basis states are selected according to the magnitude of their contribution to the VPT2 energy, for the ground state and fundamental excited states. Particularly novel aspects of this work include: expanding the potential to 6th order in normal mode coordinates, using a double-iterative procedure in which configuration selection and VCI wavefunction updates are performed iteratively (micro-iterations) over a range of screening threshold values (macro-iterations), and characterisation of computational resource requirements as a function of molecular size. Computational costs may be further reduced by a priori truncation of the VCI wavefunction according to maximum extent of mode coupling, along with discarding negligible force constants and VCI matrix elements, and formulating the wavefunction in a harmonic oscillator product basis to enable efficient evaluation of VCI matrix elements. Combining these strategies, we define a series of screening procedures that scale as O ( Nmode 6 ) - O ( Nmode 9 ) in run time and O ( Nmode 6 ) - O ( Nmode 7 ) in memory, depending on the desired level of accuracy. Our open-source code is freely available for download from http://www.sourceforge.net/projects/pyvci-vpt2.

  19. The accuracy of geometries for iron porphyrin complexes from density functional theory

    DEFF Research Database (Denmark)

    Rydberg, Patrik Åke Anders; Olsen, Lars

    2009-01-01

    Iron porphyrin complexes are cofactors in many important proteins such as cytochromes P450, hemoglobin, heme peroxidases, etc. Many computational studies on these systems have been done over the past decade. In this study, the performance of some of the most commonly used density functional theory...... functionals is evaluated with regard to how they reproduce experimental structures. Seven different functionals (BP86, PBE, PBE0, TPSS, TPSSH, B3LYP, and B97-D) are used to study eight different iron porphyrin complexes. The results show that the TPSSH, PBE0, and TPSS functionals give the best results...... (absolute bond distance deviations of 0.015-0.016 A), but the geometries are well-reproduced by all functionals except B3LYP. We also test four different basis sets of double-zeta quality, and we find that a combination of double-zeta basis set of Schafer et al. on the iron atom and the 6-31G* basis set...

  20. Ligações insuspeitas entre carnaval e dialogismo / Insuspected links between carnival and dialogism

    Directory of Open Access Journals (Sweden)

    Anthony Wall

    2010-08-01

    Full Text Available RESUMO: Em lugar de procurar interpretar o carnaval de Bakhtin e suas teorias sobre o dialogismo como se representassem duas correntes independentes em seus escritos, este artigo prop~oe que se vejamos dois conceitos como intimamente ligados um ao outro. Para esta discussão, apresentamos diversas importantes interpretações do carnaval de Bakhtin, segundo aparecem em diversas línguas, e procuramos mostrar os momentos dialógicos ocultos de tais interpretações. Da mesma forma, empregamos teorias da enunciamção para explorar diversas e até aqui insuspeitadas ligações entre carnaval e dialogismo. ABSTRACT: Instead of attempting to interpret Bakhtin's carnival and his theories of dialogism as if they represented two independent strains of thought in his writings, this article proposes to see the two as being intimately linked with one another. For this discussion, we present several major interpretations of Bakhtin's carnival, as they appear in several languages, and we attempt to show the hidden dialogic moments of these same interpretations. Likewise, we use theories ofutterance to explore several hitherto unsuspected links between the carnival and dialogism.

  1. Accuracy of Spencer-Attix cavity theory and calculations of fluence correction factors for the air kerma formalism.

    Science.gov (United States)

    La Russa, D J; Rogers, D W O

    2009-09-01

    EGSnrc calculations of ion chamber response and Spencer-Attix (SA) restricted stopping-power ratios are used to test the assumptions of the SA cavity theory and to assess the accuracy of this theory as it applies to the air kerma formalism for 60Co beams. Consistent with previous reports, the EGSnrc calculations show that the SA cavity theory, as it is normally applied, requires a correction for the perturbation of the charged particle fluence (K(fl)) by the presence of the cavity. The need for K(fl) corrections arises from the fact that the standard prescription for choosing the low-energy threshold delta in the SA restricted stopping-power ratio consistently underestimates the values of delta needed if no perturbation to the fluence is assumed. The use of fluence corrections can be avoided by appropriately choosing delta, but it is not clear how delta can be calculated from first principles. Values of delta required to avoid K(fl) corrections were found to be consistently higher than delta values obtained using the conventional approach and are also observed to be dependent on the composition of the wall in addition to the cavity size. Values of K(fl) have been calculated for many of the graphite-walled ion chambers used by the national metrology institutes around the world and found to be within 0.04% of unity in all cases, with an uncertainty of about 0.02%.

  2. Estudo da ligação de um pilar à fundação com recurso a ligas com memória de forma

    OpenAIRE

    Leitão, Cláudio Miguel Cardoso

    2016-01-01

    A presente dissertação tem como objetivo principal estudar a resposta sísmica de um novo tipo de ligação pilar-fundação caraterizada por ter ligas com memória de forma (LMF) nas suas componentes. O objetivo principal na idealização da mesma foi tentar que o dano surgisse apenas ao nível das LMF e também que os deslocamentos máximos e residuais fossem menores. Nas ligas com memória de forma explorou-se o seu efeito superelástico. De modo a conhecer o funcionamento da nova lig...

  3. A single institution experience using the LigaSure vessel sealing system in laparoscopic nephrectomy

    Institute of Scientific and Technical Information of China (English)

    PING Hao; XING Nian-zeng; ZHANG Jun-hui; NIU Yi-nong; ZHANG Jian-zhong; WANG Jian-wen

    2011-01-01

    Background Vascular control and tissue dissection are crucial steps in successful laparoscopic surgery. Recently, a new commercially available vessel sealing technology, the LigaSure vessel sealing system (Valleylab, Boulder, USA),has been introduced. The aim of the present study was to evaluate the benefits of the LigaSure in laparoscopic nephrectomy.Methods From January 2005 to March 2010, 170 laparoscopic nephrectomies were performed with the LigaSure vessel sealing system, including simple and radical nephrectomy and nephroureterectomy. In a retrospective study, the laparoscopic operating time, estimated intraoperative blood loss, duration of postoperative drainage, total amount of postoperative drainage, as well as postoperative hospital stay, were recorded and studied.Results All 170 laparoscopic nephrectomies using LigaSure were accomplished successfully without conversion to open surgery. There was no severe vascular complication or other serious complications. The mean laparoscopic operating time was 124.2 minutes (range, 14-230 minutes); mean blood loss was 148.6 ml (range, 20-540 ml); mean time for postoperative drainage was 3.1 days (range, 1-7 days); mean amount of postoperative drainage was 206.5 ml (range, 27-435 ml) and mean postoperative hospital stay was 6.9 days (range, 3-18 days).Conclusions Laparoscopic nephrectomy using LigaSure appears technically feasible and easy, and produces satisfactory results. The LigaSure provides a safe and fast way to seal vessels and tissue bundles during nephrectomy.

  4. An aluminum resist substrate for microfabrication by LIGA.

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, James J.; Boehme, Dale R.; Hauck, Cheryl A. (Lawrence Berkeley National Laboratory, Berkeley, CA); Yang, Chu-Yeu Peter; Hunter, Luke L.; Griffiths, Stewart K.; McLean, Dorrance E.; Aigeldinger, Georg; Hekmaty, Michelle A.; Hachman, John T.; Losey, Matthew W.; Skala, Dawn M.; Korellis, John S.; Friedmann, Thomas Aquinas (Sandia National Laboratories, Albuquerque, NM); Yang, Nancy Y. C.; Lu, Wei-Yang

    2005-04-01

    Resist substrates used in the LIGA process must provide high initial bond strength between the substrate and resist, little degradation of the bond strength during x-ray exposure, acceptable undercut rates during development, and a surface enabling good electrodeposition of metals. Additionally, they should produce little fluorescence radiation and give small secondary doses in bright regions of the resist at the substrate interface. To develop a new substrate satisfying all these requirements, we have investigated secondary resist doses due to electrons and fluorescence, resist adhesion before exposure, loss of fine features during extended development, and the nucleation and adhesion of electrodeposits for various substrate materials. The result of these studies is a new anodized aluminum substrate and accompanying methods for resist bonding and electrodeposition. We demonstrate successful use of this substrate through all process steps and establish its capabilities via the fabrication of isolated resist features down to 6 {micro}m, feature aspect ratios up to 280 and electroformed nickel structures at heights of 190 to 1400 {micro}m. The minimum mask absorber thickness required for this new substrate ranges from 7 to 15 {micro}m depending on the resist thickness.

  5. Micro cycloid-gear system fabricated by multiexposure LIGA technique

    Science.gov (United States)

    Hirata, Toru; Chung, Song-Jo; Hein, Herbert; Akashi, Tomoyuki; Mohr, Juergen

    1999-09-01

    In this paper, a prototype of 2 mm-diameter micro-cycloid gear system fabricated by the multi-exposure LIGA technique is presented. The entire gear system consists of a casing and three vertically stacked disks and gears. Each part is composed of three different levels. The first level, 40 micrometers high, was fabricated by UV-lithography, and the second as well as the third level, 195 micrometers and 250 micrometers high respectively, were processed by aligned deep X-ray lithography (DXL). The alignment error between two DXL- processed layers was measured, and the results have turned out to be within +/- 5 micrometers range. As a result of the height control process by the mechanical surface machining, the deviation of structural height has been maintained within +/- 3 micrometers range for the UV-lithography-processed structures, and +/- 10 micrometers for the DXL-processed structures. Further the tests of gear assembly were implemented with 125 micrometers -diameter glass fiber, by using a die-bonding machine with vacuum gripper under stereo- microscope. Finally the dynamic tests of the gear system were successfully conducted with the mechanical torque input by an electrical motor. A proper rotational speed reduction was observed in the operational input range of 3 to 1500 rpm with the designed gear ratio of 18.

  6. Modeling of secondary radiation damage in LIGA PMMA resist exposure

    Science.gov (United States)

    Ting, Aili

    2003-01-01

    Secondary radiation during LIGA PMMA resist exposure adversely affects feature definition, sidewall taper and overall sidewall offset. Additionally, it can degrade the resist adjacent to the substrate, leading to the loss of free-standing features through undercutting during resist development or through mechanical failure of the degraded material. The source of this radiation includes photoelectrons, Auger electrons, fluorescence photons, etc. Sandia"s Integrated Tiger Series (ITS), a coupled electron/photon Monte Carlo transport code, was used to compute dose profiles within 1 to 2 microns of the absorber edge and near the interface of the resist with a metallized substrate. The difficulty of sub-micron resolution requirement was overcome by solving a few local problems having carefully designed micron-scale geometries. The results indicate a 2-μm dose transition region near the absorber edge resulting from PMMA"s photoelectrons. This region leads to sidewall offset and to tapered sidewalls following resist development. The results also show a dose boundary layer of around 1 μm near the substrate interface due to electrons emitted from the substrate metallization layer. The maximum dose at the resist bottom under the absorber can be very high and can lead to feature loss during development. This model was also used to investigate those resist doses resulting from multi-layer substrate.

  7. Balance Competitivo en las Ligas Europeas de Baloncesto y la NBA

    Directory of Open Access Journals (Sweden)

    Jorge García - Unanue

    2014-01-01

    Full Text Available Las ligas deportivas dependen del equilibrio competitivo entre los equipos para ser atractivas para los espectadores, de ahí la aparición del balance competitivo. Por ello, las distintas ligas deportivas han adquirido diferentes formatos que determinarán su competitividad. El objetivo de este artículo es comparar el balance competitivo de la NBA y las principales ligas europeas, teniendo en cuenta la NBA en su conjunto y cada una de sus conferencias de forma independiente. Las variables utilizadas para medir el balance competitivo han sido el índice Hirschman-Herfindal y las ratios C5 y C8. Los resultados muestran un mejor balance competitivo de la NBA en conjunto respecto a las ligas europeas, sin embargo estas diferencias desaparecen al analizar las conferencias de forma independiente. Se concluye que al tener en cuenta cada una de las conferencias de forma independiente, con una estructura más similar a las ligas europeas, se presenta un balance competitivo parecido bajo los indicadores utilizados. Sin embargo, la NBA incluye limitaciones en la competición que siguen favoreciendo la posibilidad de que sea más atractiva para el espectador.

  8. Comparison of measurement methods for microsystem components: application to microstructures made by the deep x-ray lithography process (x-ray LIGA)

    Science.gov (United States)

    Meyer, Pascal; Mäder, Olaf; Saile, Volker; Schulz, Joachim

    2009-08-01

    The LIGA (a German acronym for lithography, electroplating and molding) process using highly parallel x-rays permits the production of a microstructure with still unique characteristics: high aspect ratio, high accuracy, high perpendicularity and lower roughness of the side wall. From a marketing point of view, this qualitative description might suffice to attract users to the technology. Regarding widespread commercialization and standardization of x-ray LIGA products, our goal is to establish a rigorous dimensional metrology for which we need to understand and quantify uncertainty, which is the key to accuracy. We report on our metrological study using a coordinate measurement machine (CMM) equipped with a fibre probe (3D measurements) which will be compared to two versions of lateral top-view measurements (2D/surface measurements): an optical microscope provided with a micrometric table and a CMM with an image processing sensor; these two types of measurement methods being complementary. In fact, microsystem technology requires measurements to be performed with precision and accuracy within the range of 0.1 µm. In this paper, we present an analysis and a discussion of both types of measurement systems. The precision and reproducibility of the CMM (with fibre probe) during a two-year study will be exposed; a calibrated series part is being measured every time the machine is used. In this case, the CMM is used as a comparator. Its accuracy and the calibration of the ball diameter using an etalon (ceramic gage block) will be exposed. Furthermore, by taking into account the results obtained by the measurement system analysis (MSA), we will show the measurement's impact on the process by taking as an example the fabrication of mm gold gears for watch industry; a quantitative description of process reproducibility and of the influence of processing parameters influence will be possible in the future.

  9. Investigating Early and Late Complications in Conventional and LigaSure Hemorroidectomy

    Directory of Open Access Journals (Sweden)

    M Zare

    2014-06-01

    Full Text Available Introduction: The traditional Milligan-Morgan and the Ferguson operations are still the most used for patients with symptomatic haemorrhoids of III and IV degrees. Nowadays LigaSure is used as a new technique to decrease the complications resulting from conventional hemorroidectomy. In this study, patients were investigated on the basis of the following main outcomes: mean operative time, postoperative pain (score and duration, bleeding loss in operation, early (within the first month after surgery and late (after the first month complications in conventional as well as LigaSure hemorroidectomy. Methods: it is an analytical study conducted on 101 patients aged 19–80 years old of both males and females with III and IV-degree hemorrhoids who had been gone to Shahid Sadoughi hospital between 2011 and 2012. Forty-three patients were treated by conventional diathermy and fifty -eight by LigaSure. Patients received analgesic administration for about 24 hours after operations and, after hospital discharge. In fact, analgesia was administered until 5 days (three times a day. All patients were required to record pain from the first postoperative day until the 28th postoperative day on a self-administered NAS scale (0–10. Results: Patients completed a questionnaire face to face one week, one month, six, and twelve months after the operation. The mean operative time, bleeding loss in operation and return to work were significantly shorter in LS group, whereas there were no difference in hospital stay period, anal stenosis, healing time of wound and retention of urinary. A statistically significant difference in pain score was observed three and four days after the operation. Finally, patients with LigaSure haemorrhoidectomy recovered from pain earlier than those with conventional diathermy. Conclusions: although LigaSure proposes additional costs, it is an effective instrument in order to treat hemorrhoids of III and IV degrees.

  10. LigaSure versus Conventional Suture Ligature for Vaginal Hysterectomy: a Randomized Controlled Trial

    Directory of Open Access Journals (Sweden)

    Mohamed Abd Elzaher, a, b, Ashraf Moawad, a, c and Hanaa Abu-Ria

    2011-07-01

    Full Text Available Introduction: Vaginal hysterectomy is considered to be the method of choice for removal of the uterus. Of particular concern for the vaginal surgeon is the ability to access, visualize, and legate structures while maintaining adequate hemostasis. Surgical hemostasis can be secured by a variety of methods, including mechanical means (sutures or vessel coagulation (diathermy. Electro-surgical vessel sealing (LigaSure is a new hemostatic system based on the combination of pressure and bipolar electrical energy and is able to seal vessels up to 7 mm in diameter. Objective: To assess the safety and efficacy of using the LigaSure vessel sealing system for securing the pedicles during vaginal hysterectomy in comparison with the conventional method of securing the pedicles by suture ligation. Design: Prospective randomized controlled trial. Setting: Obstetrics and Gynecology departments (Al-Kharj University Hospital- KSA, Enjab Hospital - UAE and Gulf Medical College and Research Centre- UAE. Methods: 80 patients undergoing vaginal hysterectomy for benign conditions were randomized to either LigaSure group (n=40 or Suture group (n=40. Main outcome measures: The primary outcome measures were the operative time and blood loss while the secondary outcome measures were the hospital stay and intra- and post-operative complications. Results: Patients in the LigaSure group had a significantly reduced operating time (37.1 ± 8.9 min vs. 63.8 ± 10.9 min; P < 0.001, operative blood loss (125.5 ± 33.2 mL vs. 264.6 ± 70.4 mL; P < 0.001, requirement of surgical sutures(1.2 ± 0.4 units vs. 8.2 ± 0.4 units; p < 0.001, pain status (2.0 ± 0.6 vs. 3.7 ± 0.7; P < 0.001, and hospital stay (30.3 ± 2.5 h vs. 45.7 ±10.5 h; P < 0.001 compared to the control group. The overall complication rate in the study was 10 % (8/80, and did not differ between patients of the LigaSure and control group. Conclusion: The use of LigaSure device can reduce operative time. It allows

  11. A Transdermal Drug Delivery System Based on LIGA Technology and Soft Lithography

    Science.gov (United States)

    Matteucci, Marco; Perennes, Frederic; Marmiroli, Benedetta; Di Fabrizio, Enzo

    2007-01-01

    This report presents a transdermal drug delivery system based on LIGA fabricated microparts. It is a portable device combining a magnetically actuated micro gear pump with a microneedle array. The fluidic behaviour of the system is analyzed in order to predict its performance according to the dimension of the microparts and then compared to experimental data. The manufacturing process of both micropump and microneedle array are described.

  12. LigaSure versus Conventional Suture Ligature for Vaginal Hysterectomy: a Randomized Controlled Trial

    OpenAIRE

    Mohamed Abd Elzaher, a, b, Ashraf Moawad, a, c and Hanaa Abu-Ria

    2011-01-01

    Introduction: Vaginal hysterectomy is considered to be the method of choice for removal of the uterus. Of particular concern for the vaginal surgeon is the ability to access, visualize, and legate structures while maintaining adequate hemostasis. Surgical hemostasis can be secured by a variety of methods, including mechanical means (sutures) or vessel coagulation (diathermy). Electro-surgical vessel sealing (LigaSure) is a new hemostatic system based on the combination of pressure and bipolar...

  13. The influence of wafer elasticity on acoustic waves during LIGA development.

    Energy Technology Data Exchange (ETDEWEB)

    Ting, Aili

    2003-12-01

    During acoustically stimulated LIGA development, a wafer receives sound waves from both sides at a wide variety of incidence angles that vary in time depending on the orientation of the wafer relative to the multiple transducers that are typically actuated in a periodic sequence. It is important to understand the influence of these variables on the transmission of energy through the wafer as well as the induced motion of the wafer itself because these processes impact the induced acoustic streaming of the fluid within features, the mechanism presently thought responsible for enhanced development of LIGA features. In the present work, the impact of wafer elasticity on LIGA development is investigated. Transmission waves, wafer bending waves, and the related concepts such as critical bending frequency, mechanical impedance, coincidence, and resonance, are discussed. Supercritical-frequency incident waves induce supersonic bending waves in the wafer. Incident wave energy is channeled into three components, transmitted, reflected and energy deposited to the wafer, depending on the wafer material, thickness and wave incidence angle. Results show at normal incidence for a 1-mm PMMA wafer, about 47% of the wave energy is deposited in the wafer. The wafer gains almost half of the incident energy, a result that agrees well with the Bankert et a1 measurements. In LIGA development, transmitted waves may sometimes produce strong acoustic motion of the developer on the wafer backside, especially for the so-called coincidence case in which almost all incident wave energy transfers to the backside. Wafer bending waves cause wafer oscillation at high frequency, promoting the development process, but features shaking may weaken their attachments to the substrate. Resonance is not likely for the entire wafer, but may occur in short and wide wafer feature columns, which are least likely to break away from the substrate, perhaps resulting in good agitation of the fluid in adjacent

  14. UV-LIGA Microfabrication of 220 GHz Sheet Beam Amplifier Gratings with SU-8 Photoresists

    Science.gov (United States)

    2010-01-01

    transconductance amplifier was built to handle the needs of a large-scale (25 l bath) copper electroforming system presently under construction...UV-LIGA microfabrication of 220 GHz sheet beam amplifier gratings with SU-8 photoresists This article has been downloaded from IOPscience. Please...burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA

  15. Diamond-like nanocomposite coatings for LIGA-fabricated nickel alloy parts.

    Energy Technology Data Exchange (ETDEWEB)

    Prasad, Somuri V.; Scharf, Thomas W.

    2005-03-01

    A commercial plasma enhanced chemical vapor deposition (PECVD) technique with planetary substrate rotation was used to apply a thin (200-400 nm thick) conformal diamond-like carbon (DLC) coating (known as a diamond-like nanocomposite (DLN)) on LIGA fabricated Ni-Mn alloy parts. The PECVD technique is known to overcome the drawbacks associated with the line-of-sight nature of physical vapor deposition (PVD) and substrate heating inherent with traditional chemical vapor deposition (CVD). The purpose of the present study is to characterize the coverage, adhesion, and tribological (friction and wear) behavior of DLN coatings applied to planar and sidewall surfaces of small featured LIGA Ni-Mn fabricated parts, e.g. 280 {micro}m thick sidewalls. Friction and wear tests were performed in dry nitrogen, dry air, and air with 50% RH at Hertzian contact pressures ranging from 0.3 to 0.6 GPa. The friction coefficient of bare Ni-Mn alloy was determined to be 0.9. In contrast, low friction coefficients ({approx}0.02 in dry nitrogen and {approx}0.2 in 50% RH air) and minimal amount of wear were exhibited for the DLN coated LIGA Ni-Mn alloy parts and test coupons. This behavior was due to the ability of the coating to transfer to the rubbing counterface providing low interfacial shear at the sliding contact; resultantly, coating one surface was adequate for low friction and wear. In addition, a 30 nm thick titanium bond layer was determined to be necessary for good adhesion of DLN coating to Ni-Mn alloy substrates. Raman spectroscopy and cross-sectional SEM with energy dispersive x-ray analysis revealed that the DLN coatings deposited by the PECVD with planetary substrate rotation covered both the planar and sidewall surfaces of LIGA fabricated parts, as well as narrow holes of 300 {micro}m (0.012 inch) diameter.

  16. The use of LigaSure™ Does not Affect Histologic Margin Assessment in Pancreatoduodenectomy (PD) specimens.

    Science.gov (United States)

    Del Chiaro, Marco; Blomberg, John; Segersvärd, Ralf; Rangelova, Elena; Ansorge, Christoph; Verbeke, Caroline

    2014-11-28

    LigaSure™ is considered safe in performing pancreaticoduodenectomy (PD). However, no data are available regarding the possible damage of tissues at the resection margins and the impact thereof on histologic margin assessment. This study compares the degree of histologic damage to the resection margins when using LigaSure™ (Group 1) or traditional ligature (Group 2). Both groups included 8 consecutive patients who underwent PD at Karolinska Institute in December 2013 (Group 1) or earlier (Group 2) by the same surgeon (M.D.C.). The quality of tissues at the circumferential margins was compared between both groups by scoring for three different kinds of damage: tissue fragmentation, hemorrhage, and cell damage. The mean score for fragmentation was 1.3 (Group 1) versus 1.7 (Group 2; P=0.1). For hemorrhage the mean score was 0.8 (Group 1) versus 1.5 (Group 2; P=0.04). The mean score for cell damage was 1.4 (Group 1) compared to 1.2 (Group 2; P=0.1). LigaSure™ does not cause tissue damage that could affect histologic margin assessment in PD specimens.

  17. A LigA three-domain region protects hamsters from lethal infection by Leptospira interrogans.

    Directory of Open Access Journals (Sweden)

    Mariana L Coutinho

    2011-12-01

    Full Text Available The leptospiral LigA protein consists of 13 bacterial immunoglobulin-like (Big domains and is the only purified recombinant subunit vaccine that has been demonstrated to protect against lethal challenge by a clinical isolate of Leptospira interrogans in the hamster model of leptospirosis. We determined the minimum number and location of LigA domains required for immunoprotection. Immunization with domains 11 and 12 was found to be required but insufficient for protection. Inclusion of a third domain, either 10 or 13, was required for 100% survival after intraperitoneal challenge with Leptospira interrogans serovar Copenhageni strain Fiocruz L1-130. As in previous studies, survivors had renal colonization; here, we quantitated the leptospiral burden by qPCR to be 1.2×10(3 to 8×10(5 copies of leptospiral DNA per microgram of kidney DNA. Although renal histopathology in survivors revealed tubulointerstitial changes indicating an inflammatory response to the infection, blood chemistry analysis indicated that renal function was normal. These studies define the Big domains of LigA that account for its vaccine efficacy and highlight the need for additional strategies to achieve sterilizing immunity to protect the mammalian host from leptospiral infection and its consequences.

  18. Influence of Boundary Condition and Diffusion Coefficient on the Accuracy of Diffusion Theory in Steady-State Spatially Resolved Diffuse Reflectance of Biological Tissues

    Institute of Scientific and Technical Information of China (English)

    张连顺; 张春平; 王新宇; 祁胜文; 许棠; 田建国; 张光寅

    2002-01-01

    The applicability of diffusion theory for the determination of tissue optical properties from steady-state diffuse reflectance is investigated. Analytical expressions from diffusion theory using the two most commonly assumed boundary conditions at the air-tissue interface and the two definitions of the diffusion coefficient are compared with Monte Carlo simulations. The effects of the choice of the boundary conditions and diffusion coefficients on the accuracy of the findings for the optical parameters are quantified, and criteria for accurate curve-fitting algorithms are developed. It is shown that the error in deriving the optical coefficients is considerably smaller for the solution which uses the extrapolated boundary condition and the diffusion coefficient independence of absorption coefficient, compared to the other three solutions.

  19. Ensino de anestesiologia durante a graduação por meio de uma liga acadêmica: qual o impacto no aprendizado dos alunos?

    OpenAIRE

    Alan Saito Ramalho; Felipe Duarte Silva; Tatiana Barboza Kronemberger; Regina Albanese Pose; Marcelo Luis Abramides Torres; Maria José Carvalho Carmona; José Otávio Costa Auler Jr

    2012-01-01

    JUSTIFICATIVA E OBJETIVOS: As ligas acadêmicas vêm se firmando como instrumentos de ensino médico e inserção dos estudantes de medicina na prática das especialidades, inclusive na anestesiologia. Como o papel das ligas no processo de desenvolvimento de competências e aprendizado de seus alunos não é bem conhecido, avaliou-se o aprendizado dos integrantes de uma liga acadêmica de anestesiologia após um ano de participação nas suas atividades. MÉTODO: Os alunos de uma liga acadêmica de anestesi...

  20. Liquid theory with high accuracy and broad applicability: Coupling parameter series expansion and non hard sphere perturbation strategy

    Science.gov (United States)

    Zhou, Shiqi

    2011-12-01

    Thermodynamic and structural properties of liquids are of fundamental interest in physics, chemistry, and biology, and perturbation approach has been fundamental to liquid theoretical approaches since the dawn of modern statistical mechanics and remains so to this day. Although thermodynamic perturbation theory (TPT) is widely used in the chemical physics community, one of the most popular versions of the TPT, i.e. Zwanzig (Zwanzig, R. W. J. Chem. Phys. 1954, 22, 1420-1426) 1st-order high temperature series expansion (HTSE) TPT and its 2nd-order counterpart under a macroscopic compressibility approximation of Barker-Henderson (Barker, J. A.; Henderson, D. J. Chem. Phys. 1967, 47, 2856-2861), have some serious shortcomings: (i) the nth-order term of the HTSE is involved with reference fluid distribution functions of order up to 2n, and the higher-order terms hence progressively become more complicated and numerically inaccessible; (ii) the performance of the HTSE rapidly deteriorates and the calculated results become even qualitatively incorrect as the temperature of interest decreases. This account deals with the developments that we have made over the last five years or so to advance a coupling parameter series expansion (CPSE) and a non hard sphere (HS) perturbation strategy that has scored some of its greatest successes in overcoming the above-mentioned difficulties. In this account (i) we expatiate on implementation details of our schemes: how input information indispensable to high-order truncation of the CPSE in both the HS and non HS perturbation schemes is calculated by an Ornstein-Zernike integral equation theory; how high-order thermodynamic quantities, such as critical parameters and excess constant volume heat capacity, are extracted from the resulting excess Helmholtz free energy with irregular and inevitable numerical errors; how to select reference potential in the non HS perturbation scheme. (ii) We give a quantitative analysis on why convergence

  1. Liquid theory with high accuracy and broad applicability: Coupling parameter series expansion and non hard sphere perturbation strategy

    Directory of Open Access Journals (Sweden)

    Shiqi Zhou

    2011-12-01

    Full Text Available Thermodynamic and structural properties of liquids are of fundamental interest in physics, chemistry, and biology, and perturbation approach has been fundamental to liquid theoretical approaches since the dawn of modern statistical mechanics and remains so to this day. Although thermodynamic perturbation theory (TPT is widely used in the chemical physics community, one of the most popular versions of the TPT, i.e. Zwanzig (Zwanzig, R. W. J. Chem. Phys. 1954, 22, 1420-1426 1st-order high temperature series expansion (HTSE TPT and its 2nd-order counterpart under a macroscopic compressibility approximation of Barker-Henderson (Barker, J. A.; Henderson, D. J. Chem. Phys. 1967, 47, 2856-2861, have some serious shortcomings: (i the nth-order term of the HTSE is involved with reference fluid distribution functions of order up to 2n, and the higher-order terms hence progressively become more complicated and numerically inaccessible; (ii the performance of the HTSE rapidly deteriorates and the calculated results become even qualitatively incorrect as the temperature of interest decreases. This account deals with the developments that we have made over the last five years or so to advance a coupling parameter series expansion (CPSE and a non hard sphere (HS perturbation strategy that has scored some of its greatest successes in overcoming the above-mentioned difficulties. In this account (i we expatiate on implementation details of our schemes: how input information indispensable to high-order truncation of the CPSE in both the HS and non HS perturbation schemes is calculated by an Ornstein-Zernike integral equation theory; how high-order thermodynamic quantities, such as critical parameters and excess constant volume heat capacity, are extracted from the resulting excess Helmholtz free energy with irregular and inevitable numerical errors; how to select reference potential in the non HS perturbation scheme. (ii We give a quantitative analysis on why

  2. Accuracy and range of validity of the Wigner surmise for mixed symmetry classes in random matrix theory.

    Science.gov (United States)

    Nishigaki, Shinsuke M

    2012-12-01

    Schierenberg et al. [Phys. Rev. E 85, 061130 (2012)] recently applied the Wigner surmise, i.e., substitution of ∞ × ∞ matrices by their 2 × 2 counterparts for the computation of level spacing distributions, to random matrix ensembles in transition between two universality classes. I examine the accuracy and the range of validity of the surmise for the crossover between the Gaussian orthogonal and unitary ensembles by contrasting them with the large-N results that I evaluated using the Nyström-type method for the Fredholm determinant. The surmised expression at the best-fitting parameter provides a good approximation for 0

  3. Accuracy and range of validity of the Wigner surmise for mixed symmetry classes in random matrix theory

    Science.gov (United States)

    Nishigaki, Shinsuke M.

    2012-12-01

    Schierenberg [Phys. Rev. EPLEEE81539-375510.1103/PhysRevE.85.061130 85, 061130 (2012)] recently applied the Wigner surmise, i.e., substitution of ∞×∞ matrices by their 2×2 counterparts for the computation of level spacing distributions, to random matrix ensembles in transition between two universality classes. I examine the accuracy and the range of validity of the surmise for the crossover between the Gaussian orthogonal and unitary ensembles by contrasting them with the large-N results that I evaluated using the Nyström-type method for the Fredholm determinant. The surmised expression at the best-fitting parameter provides a good approximation for 0≲s≲2, i.e., the validity range of the original surmise.

  4. Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. II. Quadruples expansions

    Science.gov (United States)

    Eriksen, Janus J.; Matthews, Devin A.; Jørgensen, Poul; Gauss, Jürgen

    2016-05-01

    We extend our assessment of the potential of perturbative coupled cluster (CC) expansions for a test set of open-shell atoms and organic radicals to the description of quadruple excitations. Namely, the second- through sixth-order models of the recently proposed CCSDT(Q-n) quadruples series [J. J. Eriksen et al., J. Chem. Phys. 140, 064108 (2014)] are compared to the prominent CCSDT(Q) and ΛCCSDT(Q) models. From a comparison of the models in terms of their recovery of total CC singles, doubles, triples, and quadruples (CCSDTQ) energies, we find that the performance of the CCSDT(Q-n) models is independent of the reference used (unrestricted or restricted (open-shell) Hartree-Fock), in contrast to the CCSDT(Q) and ΛCCSDT(Q) models, for which the accuracy is strongly dependent on the spin of the molecular ground state. By further comparing the ability of the models to recover relative CCSDTQ total atomization energies, the discrepancy between them is found to be even more pronounced, stressing how a balanced description of both closed- and open-shell species—as found in the CCSDT(Q-n) models—is indeed of paramount importance if any perturbative CC model is to be of chemical relevance for high-accuracy applications. In particular, the third-order CCSDT(Q-3) model is found to offer an encouraging alternative to the existing choices of quadruples models used in modern computational thermochemistry, since the model is still only of moderate cost, albeit markedly more costly than, e.g., the CCSDT(Q) and ΛCCSDT(Q) models.

  5. Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. I. Triples expansions.

    Science.gov (United States)

    Eriksen, Janus J; Matthews, Devin A; Jørgensen, Poul; Gauss, Jürgen

    2016-05-21

    The accuracy at which total energies of open-shell atoms and organic radicals may be calculated is assessed for selected coupled cluster perturbative triples expansions, all of which augment the coupled cluster singles and doubles (CCSD) energy by a non-iterative correction for the effect of triple excitations. Namely, the second- through sixth-order models of the recently proposed CCSD(T-n) triples series [J. J. Eriksen et al., J. Chem. Phys. 140, 064108 (2014)] are compared to the acclaimed CCSD(T) model for both unrestricted as well as restricted open-shell Hartree-Fock (UHF/ROHF) reference determinants. By comparing UHF- and ROHF-based statistical results for a test set of 18 modest-sized open-shell species with comparable RHF-based results, no behavioral differences are observed for the higher-order models of the CCSD(T-n) series in their correlated descriptions of closed- and open-shell species. In particular, we find that the convergence rate throughout the series towards the coupled cluster singles, doubles, and triples (CCSDT) solution is identical for the two cases. For the CCSD(T) model, on the other hand, not only its numerical consistency, but also its established, yet fortuitous cancellation of errors breaks down in the transition from closed- to open-shell systems. The higher-order CCSD(T-n) models (orders n > 3) thus offer a consistent and significant improvement in accuracy relative to CCSDT over the CCSD(T) model, equally for RHF, UHF, and ROHF reference determinants, albeit at an increased computational cost.

  6. Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. II. Quadruples expansions.

    Science.gov (United States)

    Eriksen, Janus J; Matthews, Devin A; Jørgensen, Poul; Gauss, Jürgen

    2016-05-21

    We extend our assessment of the potential of perturbative coupled cluster (CC) expansions for a test set of open-shell atoms and organic radicals to the description of quadruple excitations. Namely, the second- through sixth-order models of the recently proposed CCSDT(Q-n) quadruples series [J. J. Eriksen et al., J. Chem. Phys. 140, 064108 (2014)] are compared to the prominent CCSDT(Q) and ΛCCSDT(Q) models. From a comparison of the models in terms of their recovery of total CC singles, doubles, triples, and quadruples (CCSDTQ) energies, we find that the performance of the CCSDT(Q-n) models is independent of the reference used (unrestricted or restricted (open-shell) Hartree-Fock), in contrast to the CCSDT(Q) and ΛCCSDT(Q) models, for which the accuracy is strongly dependent on the spin of the molecular ground state. By further comparing the ability of the models to recover relative CCSDTQ total atomization energies, the discrepancy between them is found to be even more pronounced, stressing how a balanced description of both closed- and open-shell species-as found in the CCSDT(Q-n) models-is indeed of paramount importance if any perturbative CC model is to be of chemical relevance for high-accuracy applications. In particular, the third-order CCSDT(Q-3) model is found to offer an encouraging alternative to the existing choices of quadruples models used in modern computational thermochemistry, since the model is still only of moderate cost, albeit markedly more costly than, e.g., the CCSDT(Q) and ΛCCSDT(Q) models.

  7. LA INFLUENCIA DE JUGAR LA LIGA DE CAMPEONES EN EL RESULTADO DE LOS EQUIPOS EN LA LIGA ESPAÑOLA DE FÚTBOL. LA IMPORTANCIA DE LA DENSIDAD COMPETITIVA

    Directory of Open Access Journals (Sweden)

    C. Lago Peñas

    2010-09-01

    Full Text Available

     

    RESUMEN

    Los objetivos de este trabajo son dos. En primer lugar estudiar los efectos que tiene disputar un partido de la Liga de Campeones sobre el resultado alcanzado por los equipos en la Liga Española en esa misma semana. En segundo lugar, verificar si la probabilidad de ganar frente a perder en la Liga Española es mayor o no para los equipos con experiencia en la Liga de Campeones frente a aquellos otros conjuntos que disputan por primera vez esta competición. La muestra consiste en 184 partidos de la Liga Española de Fútbol jugados por los equipos que se encontraban simultáneamente disputando la primera fase de la Liga de Campeones en las temporadas 2003-2004, 2004-2005 y 2005-2006. Los datos utilizados en la investigación han sido tomados de la página oficial de la Liga de Campeones, de la Liga Española y suministrados por GECA SPORT.

    De acuerdo con los resultados de la estimación de un modelo logit multinomial, disputar un partido de la Liga de Campeones durante la semana de competición no reduce la probabilidad de los equipos de ganar frente a perder en el partido de la Liga Nacional. Incluso tiene un efecto positivo para los equipos debutantes en la competición europea: cuando juegan durante la semana tienen más probabilidades de ganar en la Liga Nacional (p<0,01.

    Palabras clave: resultado, fútbol, Liga de Campeones. logit multinomial, Liga Española

     

    ABSTRACT

    This paper has two goals. First, studying the impact of playing in the Champions League on the results in the Spanish League. Second, analyzing whether being a beginner team in the

  8. Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. I. Triples expansions

    CERN Document Server

    Eriksen, Janus Juul; Jørgensen, Poul; Gauss, Jürgen

    2015-01-01

    The accuracy with which total energies of open-shell species may be calculated using coupled cluster perturbative triples expansions is investigated. In particular, the acclaimed CCSD(T) model, in which a non-iterative correction for the effect of triple excitations is added to the coupled cluster singles and doubles (CCSD) energy, is compared to the second- through sixth-order models of the recently proposed CCSD(T-n) triples series for both unrestricted as well as restricted open-shell Hartree-Fock (UHF/ROHF) reference determinants. By comparing UHF- and ROHF-based statistical results for a test set of 18 atoms and small radicals with comparable RHF-based results, it is found that not only the numerical consistency of the CCSD(T) model, but also its fortuitous cancellation of errors for closed-shell systems break down in the transition from closed- to open-shell systems. For the higher-order models of the CCSD(T-n) series, however, no behavioral differences are found between the correlated descriptions of c...

  9. Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. II. Quadruples expansions

    CERN Document Server

    Eriksen, Janus J; Jørgensen, Poul; Gauss, Jürgen

    2016-01-01

    We extend our assessment of the potential of perturbative coupled cluster (CC) expansions for a test set of open-shell species to the description of quadruple excitations. In doing so, we compare the prominent CCSDT(Q) and lambda-CCSDT(Q) (a-CCSDT(Q)) models, in which the CC singles, doubles, and triples (CCSDT) energy is augmented by similar corrections for quadruple excitations, to the second- through sixth-order models of the CCSDT(Q-n) quadruples series, which is based on a CCSDT rather than an HF zeroth-order state. By comparing the models in terms of the size-intensive recovery of as well as the total deviation from the quadruples contribution to CC singles, doubles, triples, and quadruples (CCSDTQ) energies, we find (i) that the accuracy offered by the CCSDT(Q) and a-CCSDT(Q) models is strongly dependent on the spin of the molecular ground state - like for the CCSD(T) model in the first part of the present series [arXiv:1512.02846] - and (ii) that the performance of the CCSDT(Q-n) models is practically...

  10. Evaluating Measurement Accuracy

    CERN Document Server

    Rabinovich, Semyon G

    2010-01-01

    The goal of Evaluating Measurement Accuracy: A Practical Approach is to present methods for estimating the accuracy of measurements performed in industry, trade, and scientific research. Although multiple measurements are the focus of current theory, single measurements are the ones most commonly used. This book answers fundamental questions not addressed by present theory, such as how to discover the complete uncertainty of a measurement result. In developing a general theory of processing experimental data, this book, for the first time, presents the postulates of the theory of measurements. It introduces several new terms and definitions about the relationship between the accuracy of measuring instruments and measurements utilizing these instruments. It also offers well-grounded and practical methods for combining the components of measurement inaccuracy. From developing the theory of indirect measurements to proposing new methods of reduction in place of the traditional ones, this work encompasses the ful...

  11. LigaSure血管闭合系统在胃肠癌手术中的应用%Clinical study of LigaSure vessel sealing system for surgery in gastroenteric cancer

    Institute of Scientific and Technical Information of China (English)

    庄树彤; 徐敏; 郑凯; 唐远志; 陈斌

    2010-01-01

    Objective To investigate the value of LigaSure vessel sealing system for surgery in gastroenteric cancer. Methods From January to September 2009,44 cases of gastroenteric cancer were operated by using LigaSure vessel sealing system,including 13 cases of gastric cancer, 14 cases of colon cancer, 17 cases of rectum cancer. Laparoscopy was employed in 10 cases. Results All the cases were performed successfully. The operation time was 130-250 min, the blood loss was 50-250 ml, and the number of lymph nodes resected was 4-20. None of the cases had serious complications. Conclusion As an optimal hemostatic tool, LigaSure vessel sealing system is safe and feasible for gastroenteric cancer.%目的 探讨LigaSure血管闭合系统在胃肠癌手术中的应用价值.方法 2009年1-9月应用LigaSure血管闭合系统完成胃肠癌手术44例,包括胃癌手术13例,结肠癌手术14例,直肠癌手术17例,其中腹腔镜下结直肠癌手术10例.结果 全组病例手术均获得成功,手术时间130~250min,出血量50~250ml,淋巴结清扫数量4~20枚,无严重并发症发生.结论 LigaSure血管闭合系统止血安全、可靠,值得在胃肠癌手术中推广应用.

  12. Rigorous ab initio quantum embedding for quantum chemistry using Green's function theory: screened interaction, non-local self-energy relaxation, orbital basis, and chemical accuracy

    CERN Document Server

    Lan, Tran Nguyen; Zgid, Dominika

    2016-01-01

    We present a detailed discussion of self-energy embedding theory (SEET) which is a quantum embedding scheme allowing us to describe a chosen subsystem very accurately while keeping the description of the environment at a lower cost. We apply SEET to molecular examples where commonly our chosen subsystem is made out of a set of strongly correlated orbitals while the weakly correlated orbitals constitute an environment. Such a self-energy separation is very general and to make this procedure applicable to multiple systems a detailed and practical procedure for the evaluation of the system and environment self-energy is necessary. We list all the intricacies for one of the possible procedures while focusing our discussion on many practical implementation aspects such as the choice of best orbital basis, impurity solver, and many steps necessary to reach chemical accuracy. Finally, on a set of carefully chosen molecular examples, we demonstrate that SEET which is a controlled, systematically improvable Green's fu...

  13. Ligas Acadêmicas e formação médica: contribuições e desafios

    Directory of Open Access Journals (Sweden)

    Albina Rodrigues Torres

    2008-12-01

    Full Text Available Nos últimos anos tem havido um considerável aumento do número de ligas acadêmicas atuantes nos cursos de graduação em medicina no Brasil. Esse fenômeno, no entanto, não vem sendo acompanhado de adequada reflexão sobre seus determinantes, o papel das ligas dentro das instituições, ou mesmo sua função pedagógica. A partir destas constatações, os autores analisam a precária literatura sobre o tema, descrevem a experiência das ligas acadêmicas da Faculdade de Medicina de Botucatu - Unesp e refletem a respeito do papel destas na formação médica, na tentativa de suprir um pouco dessa lacuna e contribuir para esta importante discussão.

  14. Branquitude e progresso: a Liga Paulista de Higiene Mental e os discursos paulistanos na contemporaneidade

    OpenAIRE

    Lia Novaes Serra; Lia Vainer Schucman

    2012-01-01

    O objetivo deste artigo é analisar como a política racial implementada na cidade de São Paulo, no início do século 20, se reatualiza hoje nas ideias e nas representações de progresso e desenvolvimento na metrópole paulistana. Primeiramente, investigamos o arcabouço teórico dos projetos eugenistas elaborados nas primeiras décadas do século 20, pelos psiquiatras da "Liga Paulista de Higiene Mental" (LPHM). Como procedimento de pesquisa, analisamos parte dos documentos da LPHM sobre raça e eugen...

  15. Tecnologias de ligação de espumas metálicas

    OpenAIRE

    Costa, António Paulo Santos da

    2009-01-01

    Dissertação apresentada à Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do Grau de Mestre em Engenharia Mecânica As espumas metálicas são conhecidas desde os anos 70 mas nos últimos anos foram alvo de desenvolvimentos significativos na fase de produção. Com os novos desenvolvimentos foi possível obter espumas mais resistentes que permitem aplicações estruturais mais nobres. A ligação destas espumas constitui contudo uma limitação significativa a pote...

  16. Melhorias de produto : processo pela utilização de ligas Zamac

    OpenAIRE

    Osvaldo Junior Alves Soares

    2008-01-01

    A presente dissertação tem como objetivo estudar a viabilidade de utilização da liga metálica zamac em uma empresa do setor automobilístico, como alternativa na fabricação de peças em aço carbono. A modalidade de pesquisa utilizada foi a pesquisa-ação. Para subsidiar essa dissertação, foram feitas pesquisas em livros, dissertações, teses, sites da internet e documentos da empresa estudada. Os resultados apresentados foram classificados através dos seguintes fatores fabris e manufatura (máquin...

  17. Dialética do processo de trabalho da liga de hipertensão arterial

    OpenAIRE

    Car,Marcia Regina; Egry,Emiko Yoshikawa

    1996-01-01

    Buscou-se compreender o fenômeno da assistência à saúde desenvolvida na Liga de Diagnóstico e Tratamento da Hipertensão Arterial do Hospital das Clínicas da Faculdade de Medicina da USP,evidenciando suas contradições através da articulação dos elementos constitutivos deste processo de trabalho,contidos nos depoimentos de seus agentes. As concepções dos agentes sobre este processo de trabalho expressaram uma práxis reiterativa, consagrando e consolidando um dado saber específico que,para além ...

  18. Transferability and accuracy by combining dispersionless density functional and incremental post-Hartree-Fock theories: Noble gases adsorption on coronene/graphene/graphite surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Lara-Castells, María Pilar de, E-mail: Pilar.deLara.Castells@csic.es; Bartolomei, Massimiliano [Instituto de Física Fundamental (C.S.I.C.), Serrano 123, E-28006 Madrid (Spain); Mitrushchenkov, Alexander O. [Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée (France); Stoll, Hermann [Institut für Theoretische Chemie, Universität Stuttgart, D-70550 Stuttgart (Germany)

    2015-11-21

    The accuracy and transferability of the electronic structure approach combining dispersionless density functional theory (DFT) [K. Pernal et al., Phys. Rev. Lett. 103, 263201 (2009)] with the method of increments [H. Stoll, J. Chem. Phys. 97, 8449 (1992)], are validated for the interaction between the noble-gas Ne, Ar, Kr, and Xe atoms and coronene/graphene/graphite surfaces. This approach uses the method of increments for surface cluster models to extract intermonomer dispersion-like (2- and 3-body) correlation terms at coupled cluster singles and doubles and perturbative triples level, while periodic dispersionless density functionals calculations are performed to estimate the sum of Hartree-Fock and intramonomer correlation contributions. Dispersion energy contributions are also obtained using DFT-based symmetry-adapted perturbation theory [SAPT(DFT)]. An analysis of the structure of the X/surface (X = Ne, Ar, Kr, and Xe) interaction energies shows the excellent transferability properties of the leading intermonomer correlation contributions across the sequence of noble-gas atoms, which are also discussed using the Drude oscillator model. We further compare these results with van der Waals-(vdW)-corrected DFT-based approaches. As a test of accuracy, the energies of the low-lying nuclear bound states supported by the laterally averaged X/graphite potentials (X = {sup 3}He, {sup 4}He, Ne, Ar, Kr, and Xe) are calculated and compared with the best estimations from experimental measurements and an atom-bond potential model using the ab initio-assisted fine-tuning of semiempirical parameters. The bound-state energies determined differ by less than 6–7 meV (6%) from the atom-bond potential model. The crucial importance of including incremental 3-body dispersion-type terms is clearly demonstrated, showing that the SAPT(DFT) approach effectively account for these terms. With the deviations from the best experimental-based estimations smaller than 2.3 meV (1.9%), the

  19. Effects of Process Parameters on Replication Accuracy of Microinjection Molded Cyclic Olefins Copolymers Parts

    Science.gov (United States)

    Lin, Hsuan-Liang; Chen, Chun-Sheng; Lee, Ruey-Tsung; Chen, Shia-Chung; Chien, Rean-Der; Jeng, Ming-Chang; Hwang, Jiun-Ren

    2013-04-01

    In this study, the effects of various processing parameters of microinjection molding on the replication accuracy of the micro featured fluidic platform used for DNA/RNA tests are investigated. LIGA-like processes were utilized to prepare a silicon-based SU-8 photoresist, followed by electroforming to make a Ni-Co-based stamp. A cyclic olefin copolymer (COC) was used as the injection molding material. The molding parameters associated with the replication accuracy of micro channel parts were investigated. It was found that for microinjection molded devices, the replication accuracies of the imprint width and depth increase with increasing of mold temperature, melt temperature, injection velocity, and packing pressure.

  20. Mechanical and metallographic characterization of LIGA fabricated nickel and 80%Ni-20%Fe Permalloy

    Energy Technology Data Exchange (ETDEWEB)

    Christenson, T.R.; Buchheit, T.E.; Schmale, D.T. [Sandia National Labs., Albuquerque, NM (United States); Bourcier, R.J. [Corning Inc., NY (United States). Photonic Technologies Div.

    1998-04-13

    A table top servohydraulic load frame equipped with a laser displacement measurement system was constructed for the mechanical characterization of LIGA fabricated electroforms. A drop in tensile specimen geometry which includes a pattern to identify gauge length via laser scanning has proven to provide a convenient means to monitor and characterize mechanical property variations arising during processing. In addition to tensile properties, hardness and metallurgical data were obtained for nickel deposit specimens of current density varying between 20 and 80 mA/cm{sup 2} from a sulfamate based bath. Data from 80/20 nickel-iron deposits is also presented for comparison. As expected, substantial mechanical property differences from bulk metal properties are observed as well as a dependence of material strength on current density which is supported by grain size variation. While elastic modulus values of the nickel electrodeposit are near 160 GPa, yield stress values vary by over 60%. A strong orientation in the metal electrodeposits as well as variations in nucleating and growth morphology present a concern for anisotropic and geometry dependent mechanical properties within and between different LIGA components.

  1. Complex microstructure fabrication by integrating silicon anisotropic etching and UV-LIGA technology

    Institute of Scientific and Technical Information of China (English)

    Jing Xiangmeng; Chen Di; Huang Chuang; Chen Xiang; Liu Jingquan; Zhu Jun

    2007-01-01

    A fabrication method which integrates silicon anisotropic etching micromachining with UV-LIGA technology to make complex microstructures is presented.This proposod combined process enables the fabrication of high-aspect-ratio and three-dimensional(3D)microstmctures,which cannot be fabricated by silicon bulk micromachining or UV-LIGA alone.To demonstrate this combined method.the 100μm thick SU-8 micro gears were fabricated on the silicon convex square structure.which is 100μm×100μm×80μm in dimension.In the subsequent micro hot embossing process,a novel type of plastics polyethylene terephtalate glycol(PETG)Was tried for use.Through optimizing process parameters,PETG shows the potential of being used as plastic replica in micro-electro-mechanical system(MEMS).This fabrication technology provides a new option for the increasing need of functionality,quality and economy of MEMS.

  2. MN15-L: A New Local Exchange-Correlation Functional for Kohn-Sham Density Functional Theory with Broad Accuracy for Atoms, Molecules, and Solids.

    Science.gov (United States)

    Yu, Haoyu S; He, Xiao; Truhlar, Donald G

    2016-03-08

    Kohn-Sham density functional theory is widely used for applications of electronic structure theory in chemistry, materials science, and condensed-matter physics, but the accuracy depends on the quality of the exchange-correlation functional. Here, we present a new local exchange-correlation functional called MN15-L that predicts accurate results for a broad range of molecular and solid-state properties including main-group bond energies, transition metal bond energies, reaction barrier heights, noncovalent interactions, atomic excitation energies, ionization potentials, electron affinities, total atomic energies, hydrocarbon thermochemistry, and lattice constants of solids. The MN15-L functional has the same mathematical form as a previous meta-nonseparable gradient approximation exchange-correlation functional, MN12-L, but it is improved because we optimized it against a larger database, designated 2015A, and included smoothness restraints; the optimization has a much better representation of transition metals. The mean unsigned error on 422 chemical energies is 2.32 kcal/mol, which is the best among all tested functionals, with or without nonlocal exchange. The MN15-L functional also provides good results for test sets that are outside the training set. A key issue is that the functional is local (no nonlocal exchange or nonlocal correlation), which makes it relatively economical for treating large and complex systems and solids. Another key advantage is that medium-range correlation energy is built in so that one does not need to add damped dispersion by molecular mechanics in order to predict accurate noncovalent binding energies. We believe that the MN15-L functional should be useful for a wide variety of applications in chemistry, physics, materials science, and molecular biology.

  3. Non-ergodicity transition and multiple glasses in binary mixtures: on the accuracy of the input static structure in the mode coupling theory.

    Science.gov (United States)

    Tchangnwa Nya, F; Ayadim, A; Germain, Ph; Amokrane, S

    2012-08-15

    We examine the question of the accuracy of the static correlation functions used as input in the mode coupling theory (MCT) of non-ergodic states in binary mixtures. We first consider hard-sphere mixtures and compute the static pair structure from the Ornstein-Zernike equations with the Percus-Yevick closure and more accurate ones that use bridge functions deduced from Rosenfeld's fundamental measures functional. The corresponding MCT predictions for the non-ergodicity lines and the transitions between multiple glassy states are determined from the long-time limit of the density autocorrelation functions. We find that while the non-ergodicity transition line is not very sensitive to the input static structure, up to diameter ratios D(2)/D(1) = 10, quantitative differences exist for the transitions between different glasses. The discrepancies with the more accurate closures become even qualitative for sufficiently asymmetric mixtures. They are correlated with the incorrect behavior of the PY structure at high size asymmetry. From the example of ultra-soft potential it is argued that this issue is of general relevance beyond the hard-sphere model.

  4. Processamento, caracterização microestrutural e avaliação das propriedades mecanicas da liga Al92Fe3Cr2Mn3

    OpenAIRE

    Hudson Henrique Pereira

    2008-01-01

    Ligas de alumínio (Al) contendo dispersão de partículas em escala nanométrica que apresentam valores elevados de resistência mecânica em temperaturas ambientes e em altas temperaturas já são estudadas há algum tempo. Estas ligas são conhecidas por apresentar partículas icosaedrais embebidas numa matriz de Al-α e são chamadas de ligas nanoquasicristalinas, tendo como característica marcante grande estabilidade térmica. O presente trabalho visou avaliar as propriedades mecânicas e a possib...

  5. A gente se liga em voc: reconfiguraes da TV Globo em um cenrio de convergncia miditica

    Directory of Open Access Journals (Sweden)

    Diego Gouveia Moreira

    2012-06-01

    Full Text Available Os 46 anos da Rede Globo foram comemorados com o lanamento de uma nova assinatura. Em vez do a gente se v por aqui, a emissora passou a usar a gente se liga em voc. O novo slogan volta a ateno para o telespectador. Entender o processo de transio da TV em um cenrio de convergncia e as adaptaes que a TV Globo tem implementado para atender s novas demandas so os principais objetivos deste artigo. Para isso, so abordadas as mudanas que os meios tradicionais esto realizando diante dos novos meios e so mostradas as principais estratgias da Globo nesse ecossistema miditico. Por fim, o artigo constata a instaurao de um novo estatuto da televiso.

  6. PMMA microstructure as KrF excimer-laser LIGA material

    Science.gov (United States)

    Yang, Chii-Rong; Chou, Bruce C. S.; Chou, Hsiao-Yu; Lin, Frank H. S.; Kuo, Wen-Kai; Luo, Roger G. S.; Chang, Jer-Wei; Wei, Z. J.

    1998-08-01

    PMMA (polymethyl methacrylate) has been widely used as x-ray LIGA material for its good features of electrical acid plating of all common metals to industrial applications. Unlike the tough characteristics of polyimide in almost all alkaline and acid solutions, PMMA is easily removed in chemical etchants after electroplating process. For this reason, ablation- etching characteristics of PMMA material for 3D microstructures fabrication using a 248 nm KrF excimer laser were investigated. Moreover, the uses of the laminated dry film were also studied in this work. Experimental results show that PMMA microstructures can produce the near-vertical side- wall profile as the laser fluence up to 2.5 J/cm2. PMMA templates with high aspect ratio of around 25 were demonstrated, and the sequential electroplating processes have realized the metallic microstructures. Moreover, the microstructures fabricated in dry film show the perfect side- wall quality, and no residues of debris were found.

  7. La Liga Comunista 23 de Septiembre en Sinaloa. Los restos de un naufragio: 1974-1976

    Directory of Open Access Journals (Sweden)

    Sergio Arturo Sánchez Parra

    2011-01-01

    Full Text Available El presente artículo trata sobre algunas de las principales características que adoptó el denominado “periodo gris”, etapa de la vida de la principal organización político militar de tipo urbano del México de los años setenta del siglo XX y la entidad federativa Sinaloa, ubicada en el noroeste del territorio nacional. Esta fase, se distinguió por la pérdida del “dirigente histórico” de la Liga Comunista 23 de Septiembre (LC23S, el arribo a la conducción del grupo armado de un liderazgo caracterizado por el militarismo extremo, la búsqueda de la confrontación y la derrota político y militar frente al Estado y sus fuerzas de seguridad. Destacamos en el documento tres rubros a nuestro parecer que delinean una etapa que trascendió los años aquí analizados, a las escisiones internas que operaron al seno del grupo armado, entre quienes abandonaron por diversas circunstancias la lucha revolucionaria y los que decidieron continuarla tanto a nivel nacional como en la entidad sinaloense, b la estrategia política y militar que el Estado mexicano estableció para confrontar a esta y otras insurgencias armadas, c el cariz que adoptó la violencia guerrillera en un ambiente de franco fracaso militar y sobre todo político y d las producciones discursivas que se elaboraron a pesar del ambiente de descalabro privativo en que había caído la organización clandestina. A su vez, este texto aborda las diferentes causas-nacionales y regionales-que contribuyeron a la derrota militar y sobre todo política de la Liga y su proyecto de transformación revolucionaria de la sociedad.

  8. Electromechanically driven microchopper for integration in microspectrometers based on LIGA technology

    Science.gov (United States)

    Krippner, Peter; Mohr, Juergen; Saile, Volker

    1999-09-01

    In recent years, microspectrometers made by the LIGA technology for the visible wavelength range have found their way into the market. Opening the wide field of spectral analysis in the infrared range, the concept of a highly transmissive hollow waveguide has been demonstrated successfully. In combination with linear detector arrays, hollow waveguide microspectrometers can be combined into handheld infrared spectrometer systems. The only obstacle to a miniaturized system is the lack of miniaturized light modulators. To solve this problem, a miniaturized light modulator has been developed. It consists of an oscillating stop driven by an electromagnetic actuator. It is made out of permalloy by means of LIGA micromechanics. Its outer dimensions of approx. 3.0 X 3.2 mm2 and a structure height of 280 micrometer allow it to be integrated into the plane of the entrance slit of the microspectrometer of about 20 mm to 30 mm size. The spectrometer has alignment structures to ensure positioning of the oscillating stop close to the entrance slit. This simplifies assembly. The actuator is excited by an hybrid integrated coil fixed by springs snapping into place during assembly. The maximum supply voltage of 5V allows the chopper to be used in low-voltage spectrometer systems, especially in handheld systems. The highest modulation frequency is more than 1 kHz, which is sufficient to work with the lead salt detectors commonly used. In this frequency range, detector noise is greatly attenuated compared to continuous-light operation. The paper contains an outline of the concept of the whole microspectrometer system. Experimental results are discussed to demonstrate the performance of the system.

  9. Linear-scaling time-dependent density-functional theory beyond the Tamm-Dancoff approximation: Obtaining efficiency and accuracy with in situ optimised local orbitals

    Energy Technology Data Exchange (ETDEWEB)

    Zuehlsdorff, T. J., E-mail: tjz21@cam.ac.uk; Payne, M. C. [Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Hine, N. D. M. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Haynes, P. D. [Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom)

    2015-11-28

    We present a solution of the full time-dependent density-functional theory (TDDFT) eigenvalue equation in the linear response formalism exhibiting a linear-scaling computational complexity with system size, without relying on the simplifying Tamm-Dancoff approximation (TDA). The implementation relies on representing the occupied and unoccupied subspaces with two different sets of in situ optimised localised functions, yielding a very compact and efficient representation of the transition density matrix of the excitation with the accuracy associated with a systematic basis set. The TDDFT eigenvalue equation is solved using a preconditioned conjugate gradient algorithm that is very memory-efficient. The algorithm is validated on a small test molecule and a good agreement with results obtained from standard quantum chemistry packages is found, with the preconditioner yielding a significant improvement in convergence rates. The method developed in this work is then used to reproduce experimental results of the absorption spectrum of bacteriochlorophyll in an organic solvent, where it is demonstrated that the TDA fails to reproduce the main features of the low energy spectrum, while the full TDDFT equation yields results in good qualitative agreement with experimental data. Furthermore, the need for explicitly including parts of the solvent into the TDDFT calculations is highlighted, making the treatment of large system sizes necessary that are well within reach of the capabilities of the algorithm introduced here. Finally, the linear-scaling properties of the algorithm are demonstrated by computing the lowest excitation energy of bacteriochlorophyll in solution. The largest systems considered in this work are of the same order of magnitude as a variety of widely studied pigment-protein complexes, opening up the possibility of studying their properties without having to resort to any semiclassical approximations to parts of the protein environment.

  10. Linear-scaling time-dependent density-functional theory beyond the Tamm-Dancoff approximation: Obtaining efficiency and accuracy with in situ optimised local orbitals

    Science.gov (United States)

    Zuehlsdorff, T. J.; Hine, N. D. M.; Payne, M. C.; Haynes, P. D.

    2015-11-01

    We present a solution of the full time-dependent density-functional theory (TDDFT) eigenvalue equation in the linear response formalism exhibiting a linear-scaling computational complexity with system size, without relying on the simplifying Tamm-Dancoff approximation (TDA). The implementation relies on representing the occupied and unoccupied subspaces with two different sets of in situ optimised localised functions, yielding a very compact and efficient representation of the transition density matrix of the excitation with the accuracy associated with a systematic basis set. The TDDFT eigenvalue equation is solved using a preconditioned conjugate gradient algorithm that is very memory-efficient. The algorithm is validated on a small test molecule and a good agreement with results obtained from standard quantum chemistry packages is found, with the preconditioner yielding a significant improvement in convergence rates. The method developed in this work is then used to reproduce experimental results of the absorption spectrum of bacteriochlorophyll in an organic solvent, where it is demonstrated that the TDA fails to reproduce the main features of the low energy spectrum, while the full TDDFT equation yields results in good qualitative agreement with experimental data. Furthermore, the need for explicitly including parts of the solvent into the TDDFT calculations is highlighted, making the treatment of large system sizes necessary that are well within reach of the capabilities of the algorithm introduced here. Finally, the linear-scaling properties of the algorithm are demonstrated by computing the lowest excitation energy of bacteriochlorophyll in solution. The largest systems considered in this work are of the same order of magnitude as a variety of widely studied pigment-protein complexes, opening up the possibility of studying their properties without having to resort to any semiclassical approximations to parts of the protein environment.

  11. Corrosão da liga niobio - 1% zirconio e de seus constituintes, niobio e zirconio, em soluções aquosas alcalinas e cloretadas

    OpenAIRE

    Raquel Martins Villela Nunes

    1994-01-01

    A liga niobio-1%zirconio vem sendo utilizada como material estrutural de reatores nucleares espaciais, refrigerados a litio liquido. O litio, mesmo tendo reatividade quimica alta causando corrosao e degradacao estrutural em suas reacoes com os materiais de contencao, possui propriedades fisico-quimicas e neutronicas excelentes como fluido trocador de calor. Embora o que interessa seja a resistencia da liga e de seus constituintes a corrosao a seco, estudos a respeito da resistencia a corrosao...

  12. TRATAMENTO TÉRMICO DE PRECIPITAÇÃO - T6 APLICADO EM RODA DE LIGA LEVE DE MOTOCICLETA

    Directory of Open Access Journals (Sweden)

    Ricardo Orcélio Miranda de Oliveira

    2014-11-01

    Full Text Available As ligas de alumínio da série A356 (Al-Si-Mg são usadas extensivamente em componentes de manufatura para indústria automotiva e aeroespacial devido a suas propriedades físicas e mecânicas. São utilizadas em muitas aplicações estruturais que requerem uma alta resistência a baixo peso, alta resistência e tenacidade ao impacto, baixo coeficiente de expansão térmica, boa resistência à corrosão e excelente fluidez, como ligas de fundição para produção de rodas de liga leve. Nesse sentido, o objetivo principal deste trabalho é avaliar os efeitos do tratamento térmico de precipitação – T6 sobre a microestrutura e propriedades mecânicas da liga A356/Al-7Si-0,3Mg. Para tanto, uma roda de motocicleta foi utilizada e o tratamento térmico aplicado na própria indústria de fabricação, conforme padrões estabelecidos. Os resultados alcançados mostram uma microestrutura eutética composta de Si (esferoidizado mais os intermetálicos de Fe, que foram observados entre as ramificações interdendríticas. Ensaios de dureza Rocwell B foram realizados e os valores obtidos correspondem aos padrões estabelecidos.

  13. Liga NiCrSiBC: Microestrutura e Dureza de Revestimentos Processados a Arco e a Laser

    Directory of Open Access Journals (Sweden)

    Leandro J. da Silva

    2015-03-01

    Full Text Available A técnica de processamento é determinante sobre características de um revestimento. Isso porque o aporte térmico, que depende da técnica e dos parâmetros, tem influência sobre a diluição e a taxa de solidificação. Em ligas com baixa complexidade metalúrgica, o impacto do processamento com técnicas de deposição que impõem maior taxa de resfriamento podem se traduzir em refino da microestrutura. Espera-se que quanto mais refinada a microestrutura maior a resistência mecânica do revestimento. Entretanto, na deposição de ligas de maior complexidade metalúrgica isso nem sempre ocorre, porque a elevada taxa de resfriamento pode suprimir formação/precipitação de fases responsáveis pela resistência. Neste estudo, a influência do processamento sobre microestrutura e dureza de revestimentos da liga Colmonoy-6® foi avaliada. A liga foi processada por plasma com arco transferido (PTA e laser de diodo de alta potência (HPDL sobre chapas de AISI 304 com dois níveis de diluição. Em ambos os casos, revestimentos de boa qualidade e livres defeitos foram obtidos. O aumento do teor de Fe (diluição e as diferentes taxas de resfriamento decorrem do processamento com diferentes parâmetros e técnicas. Em consequência, ocorrem mudanças significativas na microestrutura e na dureza dos revestimentos que estão associadas à distribuição, morfologia e composição química dos carbonetos e, principalmente, dos boretos.

  14. Positional Accuracy Analysis of Polishing Robot Based on Screw Theory%基于旋量理论的打磨机器人位置精度分析

    Institute of Scientific and Technical Information of China (English)

    张秀珩; 柳洪义; 罗忠

    2016-01-01

    In order to establish mapping relationship between allerror sources and the position errors of the polish robot end-effec-tor, kinematics model of the polishing robot was established based on screw theory. The possibleproduced main sources of errors were analyzed. By mean of the geometric relationship between the sources of the errorsto establish the error screw, the static error model was obtained. The analysis work was done about the impact of the individual errors on the robot end-effector position error and a significant impact on the end position errorby all error sourcesto provide precision reliable analytic reference for the proposed optimization program. The analysis results show that the structure of errors and transmission errors are the main factors of impact on the robot static position accuracy, in which the structure errors are steady stateerrors, that can be reduced or compensated by the precision design, and trans-mission errors is required to solve by the latter calibrate program.%为建立各误差源与打磨机器人的末端位置误差的对应关系,在基于旋量理论建立了打磨机器人的运动学模型的同时,对可能产生的主要误差源进行了分析,通过误差源之间的几何关系建立误差旋量,从而得到静态误差模型;分析了各单项误差对机器人末端执行器位置误差的影响及各误差源对末端位置误差的显著性影响,为机器人精度优化方案的提出提供可靠的分析参考。分析结果表明:结构误差及传动误差是机器人静态位置精度的主要影响因素,其中结构误差为稳态误差,可以通过精度设计减小或补偿,传动误差需要通过后期的标定来解决。

  15. A CONTRIBUIÇÃO DE UMA LIGA ACADÊMICA NO ENSINO DE GRADUAÇÃO EM ENFERMAGEM

    Directory of Open Access Journals (Sweden)

    Marislei Sanches Panobianco

    2013-01-01

    Full Text Available Estudio cuantitativo, descriptivo y transversal, cuyo objetivo fue identificar y evaluar la contribución de una liga de estudiantes de enfermería. Llevado a cabo entre mayo y agosto de 2010, a través de un cuestionario semiestructurado aplicado a estudiantes de graduación en las instalaciones de una institución de educación superior y enviado por correo electrónico, a los graduados, con total de 22 encuestados vinculados a una aleación la prevención y la lucha contra el cáncer. Las respuestas han sido estructuradas en una base de datos en Excel (Windows 2007, y después, el análisis realizado por medio del programa Epi Info, utilizando estadística descriptiva. Cumplido con las normas éticas. Todos los encuestados afirmaron que la Liga ha contribuido para el aprendizaje académico. La Liga demostró ser una enseñanza importante, que contribuye a la formación profesional, para reflexión crítica sobre oncología y promoción de la asistencia humanitaria.

  16. Análise teórico-experimental de ligações mistas em perfis formados a frio

    Directory of Open Access Journals (Sweden)

    Juliano Bastos Cabral

    2006-03-01

    Full Text Available Nesse trabalho, tem-se, como objetivo, determinar o comportamento de ligações mistas viga-pilar em perfis formados a frio, a partir de estudos teórico experimentais da edificação de quatro pavimentos. Os estudos se basearam em análises estruturais e dimensionamentos desta edificação e em análises experimentais de ligações tipo do projeto. O programa experimental foi composto por cinco ensaios, em três diferentes configurações de ligações mistas, que permitiram determinar as suas respectivas curvas momento x rotação e rigidezes.This work had as a goal to determine the behavior of composite beam-column connections in cold-formed steel profiles. Experimental and theoretical studies were developed using a four-story building. The studies were based on the structural analyses and design of this construction and the experimental analyses of the project's typical joints. The experimental program had five tests in three different configurations of composite joints, which allowed setting curves for moment x rotation and rigidity.

  17. Test Expectancy Affects Metacomprehension Accuracy

    Science.gov (United States)

    Thiede, Keith W.; Wiley, Jennifer; Griffin, Thomas D.

    2011-01-01

    Background: Theory suggests that the accuracy of metacognitive monitoring is affected by the cues used to judge learning. Researchers have improved monitoring accuracy by directing attention to more appropriate cues; however, this is the first study to more directly point students to more appropriate cues using instructions regarding tests and…

  18. Photoablation characteristics of novel polyimides synthesized for high-aspect-ratio excimer laser LIGA process

    Science.gov (United States)

    Yang, Chii-Rong; Hsieh, Yu-Sheng; Hwang, Guang-Yeu; Lee, Yu-Der

    2004-04-01

    The photoablation properties of two soluble polyimides DMDB/6FDA and OT/6FDA with thicknesses of over 300 µm, synthesized by the polycondensation of a hexafluoropropyl group contained in a dianhydride with two kinds of diamines, are investigated using a 248 nm krypton fluoride (KrF) laser. The incorporation of the hexafluoropropyl group into the chemical structure gives these two polyimides higher etching rates than Kapton (a commercial polyimide film which is difficult to dissolve). The etching rates of synthesized polyimides are about 0.1-0.5 µm/pulse over a fluence range of 0.25-2.25 J cm-2. The photothermal mechanism for DMDB/6FDA contributes about 19% of etching depth at a laser fluence of 0.82 J cm-2. Moreover, the number of laser pulses seriously affects the taper angle of microstructures, especially at low fluence. Near-vertical side-wall structures can be built at high fluence (~2 J cm-2). Fresnel patterns with a thickness of 300 µm and a linewidth of 10 µm were fabricated, with an attainable aspect ratio of around 30. After photoablation, the complementary metallic microstructures were also fabricated by a sequential electroplating procedure. Then, those two new polyimides could be dissolved easily in most common solvents (such as THF, DMSO, NMP and DMF). These results indicate that these two soluble polyimides are highly suitable for use in the KrF laser LIGA process.

  19. Espectroscopia anelástica em ligas de Nb-16% p. Ti

    Directory of Open Access Journals (Sweden)

    Renata Abdallah Nogueira

    2003-12-01

    Full Text Available Átomos de oxigênio, presentes em metais com estrutura cristalina cúbica de corpo centrado, são localizados preferencialmente em sítios octaedrais. Na ausência de uma tensão mecânica externa, estes átomos são distribuídos aleatoriamente. Na presença de oscilações mecânicas, a redistribuição dos átomos nos diferentes sítios deve ocorrer pela interação com esta tensão, levando a perdas na energia elástica. Este trabalho mostra o estudo da interação de átomos de oxigênio presentes em amostras da liga Nb-16% p. Ti, utilizando um pêndulo de torção. Os resultados mostram espectros bastante complexos, que foram decompostos em seus picos constituintes, representando os processos de relaxação devido à reorientação induzida por tensão de átomos e pares de átomos de oxigênio em torno de átomos de nióbio da matriz metálica e átomos de oxigênio em torno de átomos de titânio (interação substitucional-intersticial.

  20. The use of the LigaSure Vessel Sealing System in esophageal cancer surgery.

    Science.gov (United States)

    Eroglu, Atilla; Turkyilmaz, Atila; Aydin, Yener; Erdem, Ali Fuat; Tokur, Mahmut; Karaoglanoglu, Nurettin

    2007-12-01

    In this clinical study we investigated the use and results of the LigaSure Vessel Sealing Sytem (LVSS) (Valleylab, Boulder, CO) compared with conventional surgery in esophageal cancer resection. The LVSS (Valleylab) is a device with a hemostatic design frequently used in abdominal surgery. Sixty patients (n = 30 in each group) with esophageal cancer from a single center were evaluated to undergo esophagectomy using either the LVSS or conventional clamping methods. The main outcome measures (ie, operating time, intraoperative blood loss, and postoperative course) were then compared. In resections performed using the LVSS, operation duration (307 +/- 35 minutes vs 260 +/- 35 minutes; p = 0.000), intraoperative blood loss (average 533 +/- 211 mL vs 390 +/- 256 mL; p = 0.022), and postoperative drainage volumes (abdomen, 70 +/- 86 mL vs 40 +/- 61 mL; p = 0.122; thorax, 690 +/- 646 mL vs 540 +/- 359 mL; p = 0.271) all decreased. The LVSS is easy to use and a reliable method in esophageal cancer surgery. Compared with conventional hemostatic techniques a reduction in intraoperative and postoperative blood loss, and a shortening of operation duration were determined. We believe that the use of the LVSS in esophageal surgery will become even more widespread in the future.

  1. Fine Mapping of the Interaction between C4b-Binding Protein and Outer Membrane Proteins LigA and LigB of Pathogenic Leptospira interrogans.

    Science.gov (United States)

    Breda, Leandro C D; Hsieh, Ching-Lin; Castiblanco Valencia, Mónica M; da Silva, Ludmila B; Barbosa, Angela S; Blom, Anna M; Chang, Yung-Fu; Yung-Fu, Chang; Isaac, Lourdes

    2015-01-01

    The complement system consists of more than 40 proteins that participate in the inflammatory response and in pathogen killing. Complement inhibitors are necessary to avoid the excessive consumption and activation of this system on host cells. Leptospirosis is a worldwide zoonosis caused by spirochetes from the genus Leptospira. Pathogenic leptospires are able to escape from complement activation by binding to host complement inhibitors Factor H [FH] and C4b-binding protein (C4BP) while non-pathogenic leptospires are rapidly killed in the presence of fresh serum. In this study, we demonstrate that complement control protein domains (CCP) 7 and 8 of C4BP α-chain interact with the outer membrane proteins LcpA, LigA and LigB from the pathogenic leptospire L. interrogans. The interaction between C4BP and LcpA, LigA and LigB is sensitive to ionic strength and inhibited by heparin. We fine mapped the LigA and LigB domains involved in its binding to C4BP and heparin and found that both interactions are mediated through the bacterial immunoglobulin-like (Big) domains 7 and 8 (LigA7-8 and LigB7-8) of both LigA and LigB and also through LigB9-10. Therefore, C4BP and heparin may share the same binding sites on Lig proteins.

  2. Comparison and Efficacy of LigaSure and Rubber Band Ligature in Closing the Inflamed Cecal Stump in a Rat Model of Acute Appendicitis

    Directory of Open Access Journals (Sweden)

    Chun-Chieh Yeh

    2015-01-01

    Full Text Available Safety of either LigaSure or rubber band in closing inflamed appendiceal stump in acute appendicitis has been less investigated. In this study, cecal ligation followed by resecting inflamed cecum was performed to mimic appendectomy in a rat model of acute appendicitis. Rats were sacrificed immediately (Group A and 7 days (Group B after cecal resection, respectively. The cecal stumps were closed by silk ligature (S, 5 mm LigaSure (L, or rubber band (R. Seven days after cecal resection, the LigaSure (BL and silk subgroups (BS had significantly less intra-abdominal adhesion and better laparotomy wound healing than rubber band subgroup (BR. The initial bursting pressure at cecal stump was comparable among the three methods; along with tissue healing process, both BL and BS provided a higher bursting pressure than BR 7 days after appendectomy. BL subgroup had more abundant hydroxyproline deposition than BS and BR subgroup. Furthermore, serum TNF-α in BR group kept persistently increasing along with time after cecal resection. Thus, the finding that LigaSure but not rubber band is safe in sealing off the inflamed cecal stump in rat model of acute appendicitis suggests the possibility of applying LigaSure for appendectomy via single port procedure or natural orifice transluminal endoscopic surgery (NOTES.

  3. Accuracy and limitations of second-order many-body perturbation theory for predicting vertical detachment energies of solvated-electron clusters.

    Science.gov (United States)

    Herbert, John M; Head-Gordon, Martin

    2006-01-07

    Vertical electron detachment energies (VDEs) are calculated for a variety of (H(2)O)(n)(-) and (HF)(n)(-) isomers, using different electronic structure methodologies but focusing in particular on a comparison between second-order Møller-Plesset perturbation theory (MP2) and coupled-cluster theory with noniterative triples, CCSD(T). For the surface-bound electrons that characterize small (H(2)O)(n)(-) clusters (nVDEs larger than about 0.4 eV. CCSD(T) detachment energies are bounded from below by MP2 values and from above by VDEs calculated using second-order many-body perturbation theory with molecular orbitals obtained from density functional theory. For a variety of both strongly- and weakly-bound isomers of (H(2)O)(20)(-) and (H(2)O)(24)(-), including both surface states and cavity states, these bounds afford typical error bars of +/-0.1 eV. We have found only one case where the Hartree-Fock and density functional orbitals differ qualitatively; in this case the aforementioned bounds lie 0.4 eV apart, and second-order perturbation theory may not be reliable.

  4. Single incision cholecystectomy using a clipless technique with LigaSure in a resource limited environment: The Bahamas experience

    Directory of Open Access Journals (Sweden)

    Ross O. Downes

    2015-01-01

    Conclusions: SILC is a safe and feasible technique for operating with scarless outcomes and reducing perioperative discomfort at the same time. The GelPOINTTM is a safe and feasible platform to be used. The procedure can be accomplished using regular instruments and laparoscope. Curved instruments and a bariatric length laparoscope may make the procedure easier and result in greater time saving. The addition of LigaSure™ decreases the complexity of the operation, decreases operative time and blood loss. The technique is economical in a resource-limited environment.

  5. Ensino de anestesiologia durante a graduação por meio de uma liga acadêmica: qual o impacto no aprendizado dos alunos?

    Directory of Open Access Journals (Sweden)

    Alan Saito Ramalho

    2012-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: As ligas acadêmicas vêm se firmando como instrumentos de ensino médico e inserção dos estudantes de medicina na prática das especialidades, inclusive na anestesiologia. Como o papel das ligas no processo de desenvolvimento de competências e aprendizado de seus alunos não é bem conhecido, avaliou-se o aprendizado dos integrantes de uma liga acadêmica de anestesiologia após um ano de participação nas suas atividades. MÉTODO: Os alunos de uma liga acadêmica de anestesiologia foram acompanhados de março a dezembro de 2010 e avaliados por meio de testes cognitivos objetivos de múltipla escolha aplicados antes do início das atividades e após sua conclusão. A frequência nas atividades e o perfil epidemiológico dos alunos foram correlacionados aos resultados dos testes. RESULTADOS: Foram analisados 20 acadêmicos do 3º ao 6º ano, com média de idade de 22,8 (21-26 anos. A frequência média nas atividades propostas foi 10,4/13 (80%. A média de acertos no primeiro teste foi 8,1/17 (47,6%, sendo que os alunos do 3º ano apresentam notas menores (p < 0,02 em relação aos demais. No teste pós-liga, a média de acertos foi 11,9/17 (70%, mostrando melhora no desempenho dos alunos (p < 0,05, e não houve diferença entre as notas dos diferentes anos da graduação. Foi encontrada relação forte entre frequência nas atividades e melhora nas notas (r = 0,719; p < 0,001. CONCLUSÕES: Os alunos que participaram da liga apresentaram melhora nos testes de avaliação de conhecimento, sugerindo que a liga é útil instrumento de ensino e promove ganho de aprendizado em anestesiologia. As atividades desenvolvidas nas ligas podem ter papel positivo na formação acadêmica dos graduandos, destacando-se, neste artigo, a anestesiologia

  6. On the accuracy of density-functional theory exchange-correlation functionals for H bonds in small water clusters. II. The water hexamer and van der Waals interactions

    NARCIS (Netherlands)

    Santra, Biswajit; Michaelides, Angelos; Fuchs, Martin; Tkatchenko, Alexandre; Filippi, Claudia; Scheffler, Matthias

    2008-01-01

    Second order Møller–Plesset perturbation theory at the complete basis set limit and diffusion quantum Monte Carlo are used to examine several low energy isomers of the water hexamer. Both approaches predict the so-called prism to be the lowest energy isomer, followed by cage, book, and cyclic isomer

  7. Improving accuracy in the quantitation of overlapping, asymmetric, chromatographie peaks by deconvolution: theory and application to coupled gas chromatography atomic absorption spectrometry

    Science.gov (United States)

    Johansson, M.; Berglund, M.; Baxter, D. C.

    1993-09-01

    Systematic errors in the measurement of overlapping asymmetric, Chromatographic peaks are observed using the perpendicular-drop and tangent-skimming algorithms incorporated in commercial integrators. The magnitude of such errors increases with the degree of tailing and differences in peak size, and was found to be as great as 80% for peak-area and 100% for peak-height measurements made on the smaller, second component of simulated, noise-free chromatograms containing peaks at a size ratio of 10 to 1. Initial deconvolution of overlapping peaks, by mathematical correction for asymmetry, leads to significant improvements in the accuracy of both peak-area and height measurements using the simple, perpendicular-drop algorithm. A comparison of analytical data for the separation and determination of three organolead species by coupled gas chromatography atomic absorption spectrometry using peak-height and area measurements also demonstrates the improved accuracy obtained following deconvolution. It is concluded that the deconvolution method described could be beneficial in a variety of Chromatographic applications where overlapping, asymmetric peaks are observed.

  8. Classical Spin Nematic Transition in LiGa0.95In0.05Cr4O8

    Science.gov (United States)

    Wawrzyńczak, R.; Tanaka, Y.; Yoshida, M.; Okamoto, Y.; Manuel, P.; Casati, N.; Hiroi, Z.; Takigawa, M.; Nilsen, G. J.

    2017-08-01

    We present the results of a combined 7Li -NMR and diffraction study on LiGa0.95In0.05Cr4O8, a member of the LiGa1 -xInxCr4O8 "breathing" pyrochlore family. Via specific heat and NMR measurements, we find that the complex sequence of first-order transitions observed for LiGaCr4O8 is replaced by a single second-order transition at Tf=11 K . Neutron and x-ray diffraction rule out both structural symmetry lowering and magnetic long-range order as the origin of this transition. Instead, reverse Monte Carlo fitting of the magnetic diffuse scattering indicates that the low-temperature phase may be described as a collinear spin nematic state, characterized by a quadrupolar order parameter. This state also shows signs of short-range order between collinear spin arrangements on tetrahedra, revealed by mapping the reverse Monte Carlo spin configurations onto a three-state color model.

  9. Liga de Geriatria e Gerontologia da Universidade Federal do Triângulo Mineiro: relato de experiência

    Directory of Open Access Journals (Sweden)

    Liciane Langona Montanholi

    2010-06-01

    Full Text Available A Liga de Geriatria e Gerontologia da Universidade Federal do Triângulo Mineiro (LGG/UFTM, Uberaba-MG, fundada em 2003 foi composta por acadêmicos de medicina e enfermagem, que desenvolviam atividades ambulatoriais, científicas e de extensão. Nas atividades ambulatoriais os acadêmicos acompanharam consultas geriátricas e avaliaram física e mentalmente os internos de uma Instituição de Longa Permanência para Idosos (ILPI. Como atividades de extensão foram realizadas as campanhas sobre as doenças de Alzheimer e Parkinson. Nas reuniões científicas foram discutidos temas abordando o envelhecimento. Projetos científicos foram desenvolvidos, dentre eles “Ensino sobre idoso e gerontologia: visão do discente de enfermagem no Estado de Minas Gerais” e “Amiloidose cerebral e cardíaca em indivíduos idosos autopsiados”. Além disso, a Liga participou da disciplina optativa “Processos patológicos gerais associados ao envelhecimento”. Portanto, os integrantes da LGG/UFTM por meio das atividades desenvolvidas puderam ampliar seu conhecimento científico-prático na área do envelhecimento, sendo estas experiências coadjuvantes da melhoria tanto da formação acadêmica quanto da assistência ao paciente idoso.

  10. Linear-scaling time-dependent density-functional theory (TDDFT) beyond the Tamm-Dancoff approximation: obtaining efficiency and accuracy with in situ optimised local orbitals

    CERN Document Server

    Zuehlsdorff, Tim J; Payne, Mike C; Haynes, Peter D

    2015-01-01

    We present a solution of the full TDDFT eigenvalue equation in the linear response formalism exhibiting a linear-scaling computational complexity with system size, without relying on the simplifying Tamm-Dancoff approximation (TDA). The implementation relies on representing the occupied and unoccupied subspace with two different sets of in situ optimised localised functions, yielding a very compact and efficient representation of the transition density matrix of the excitation with the accuracy associated with a systematic basis set. The TDDFT eigenvalue equation is solved using a preconditioned conjugate-gradients algorithm that is very memory-efficient. The algorithm is validated on a test molecule and a good agreement with results obtained from standard quantum chemistry packages is found, with the preconditioner yielding a significant improvement in convergence rates. The method developed in this work is then used to reproduce experimental results of the absorption spectrum of bacteriochlorophyll (BChl) i...

  11. Exact thermal density functional theory for a model system: Correlation components and accuracy of the zero-temperature exchange-correlation approximation

    Science.gov (United States)

    Smith, J. C.; Pribram-Jones, A.; Burke, K.

    2016-06-01

    Thermal density functional theory calculations often use the Mermin-Kohn-Sham scheme, but employ ground-state approximations to the exchange-correlation (XC) free energy. In the simplest solvable nontrivial model, an asymmetric Hubbard dimer, we calculate the exact many-body energies and the exact Mermin-Kohn-Sham functionals for this system and extract the exact XC free energy. For moderate temperatures and weak correlation, we find this approximation to be excellent. We extract various exact free-energy correlation components and the exact adiabatic connection formula.

  12. Density-Functional Theory with Dispersion-Correcting Potentials for Methane: Bridging the Efficiency and Accuracy Gap between High-Level Wave Function and Classical Molecular Mechanics Methods.

    Science.gov (United States)

    Torres, Edmanuel; DiLabio, Gino A

    2013-08-13

    Large clusters of noncovalently bonded molecules can only be efficiently modeled by classical mechanics simulations. One prominent challenge associated with this approach is obtaining force-field parameters that accurately describe noncovalent interactions. High-level correlated wave function methods, such as CCSD(T), are capable of correctly predicting noncovalent interactions, and are widely used to produce reference data. However, high-level correlated methods are generally too computationally costly to generate the critical reference data required for good force-field parameter development. In this work we present an approach to generate Lennard-Jones force-field parameters to accurately account for noncovalent interactions. We propose the use of a computational step that is intermediate to CCSD(T) and classical molecular mechanics, that can bridge the accuracy and computational efficiency gap between them, and demonstrate the efficacy of our approach with methane clusters. On the basis of CCSD(T)-level binding energy data for a small set of methane clusters, we develop methane-specific, atom-centered, dispersion-correcting potentials (DCPs) for use with the PBE0 density-functional and 6-31+G(d,p) basis sets. We then use the PBE0-DCP approach to compute a detailed map of the interaction forces associated with the removal of a single methane molecule from a cluster of eight methane molecules and use this map to optimize the Lennard-Jones parameters for methane. The quality of the binding energies obtained by the Lennard-Jones parameters we obtained is assessed on a set of methane clusters containing from 2 to 40 molecules. Our Lennard-Jones parameters, used in combination with the intramolecular parameters of the CHARMM force field, are found to closely reproduce the results of our dispersion-corrected density-functional calculations. The approach outlined can be used to develop Lennard-Jones parameters for any kind of molecular system.

  13. On the accuracy of van der Waals inclusive density-functional theory exchange-correlation functionals for ice at ambient and high pressures

    Science.gov (United States)

    Santra, Biswajit; Klimeš, Jiří; Tkatchenko, Alexandre; Alfè, Dario; Slater, Ben; Michaelides, Angelos; Car, Roberto; Scheffler, Matthias

    2013-10-01

    Density-functional theory (DFT) has been widely used to study water and ice for at least 20 years. However, the reliability of different DFT exchange-correlation (xc) functionals for water remains a matter of considerable debate. This is particularly true in light of the recent development of DFT based methods that account for van der Waals (vdW) dispersion forces. Here, we report a detailed study with several xc functionals (semi-local, hybrid, and vdW inclusive approaches) on ice Ih and six proton ordered phases of ice. Consistent with our previous study [B. Santra, J. Klimeš, D. Alfè, A. Tkatchenko, B. Slater, A. Michaelides, R. Car, and M. Scheffler, Phys. Rev. Lett. 107, 185701 (2011)] which showed that vdW forces become increasingly important at high pressures, we find here that all vdW inclusive methods considered improve the relative energies and transition pressures of the high-pressure ice phases compared to those obtained with semi-local or hybrid xc functionals. However, we also find that significant discrepancies between experiment and the vdW inclusive approaches remain in the cohesive properties of the various phases, causing certain phases to be absent from the phase diagram. Therefore, room for improvement in the description of water at ambient and high pressures remains and we suggest that because of the stern test the high pressure ice phases pose they should be used in future benchmark studies of simulation methods for water.

  14. Test expectancy affects metacomprehension accuracy.

    Science.gov (United States)

    Thiede, Keith W; Wiley, Jennifer; Griffin, Thomas D

    2011-06-01

    Theory suggests that the accuracy of metacognitive monitoring is affected by the cues used to judge learning. Researchers have improved monitoring accuracy by directing attention to more appropriate cues; however, this is the first study to more directly point students to more appropriate cues using instructions regarding tests and practice tests. The purpose of the present study was to examine whether the accuracy metacognitive monitoring was affected by the nature of the test expected. Students (N= 59) were randomly assigned to one of two test expectancy groups (memory vs. inference). Then after reading texts, judging learning, completed both memory and inference tests. Test performance and monitoring accuracy were superior when students received the kind of test they had been led to expect rather than the unexpected test. Tests influence students' perceptions of what constitutes learning. Our findings suggest that this could affect how students prepare for tests and how they monitoring their own learning. ©2010 The British Psychological Society.

  15. [As the twig is bent, so is the tree inclined: children and the Liga Brasileira de Higiene Mental's eugenic programs].

    Science.gov (United States)

    Reis, J R

    2000-01-01

    Created in the early 1920s, at a moment when the country's psychiatric field was embracing the preventive outlook, the Liga Brasileira de Higiene Mental included within its members the elite of Brazilian psychiatry, along with a number of physicians and intellectuals. The article discusses the institution's proposals for intervention among children. The league ended up incorporating into its theoretical arsenal the basic themes of mental hygiene and eugenics as part of its general goal of collaborating in Brazil's process of "racial sanitation". With this objective in mind, and viewing the child as a "pre-citizen" who is a "fundamental part within the man of the future", league members included the children's issue in their projects and saw an imperative need for mental health care from early ages on.

  16. EFECTO DE LA GEOMETRÍA DEL MOLDE EN EL ELECTROFORMADO DE MICROPIEZAS POR UV-LIGA

    Directory of Open Access Journals (Sweden)

    JUAN C. GAVIRIA VILLA

    2009-01-01

    Full Text Available UV-LIGA es una técnica versátil que permite la fabricación de piezas metálicas con alta relación de aspecto (alto/ancho mediante la combinación del procesamiento fotolitográfico de un polímero y la electroformación de un metal al interior de las cavidades grabadas en el polímero. Esta técnica de bajo costo es empleada en una gran variedad de áreas que comprenden la microfluídica, la óptica, la instrumentación, el moldeado de plásticos y las telecomunicaciones, entre otras. Para aproximar a Colombia a estas tecnologías modernas de procesamiento de materiales, el Grupo de Ciencia y Tecnología de Materiales ha iniciado un proceso de apropiación de técnicas de microfabricación, específicamente, este artículo presenta los resultados de la implementación de la técnica UV-LIGA para la fabricación de micropiezas de Níquel y examina los efectos de la geometría del molde en la velocidad de crecimiento e integridad de los depósitos obtenidos, parámetros que sonimportantes para conseguir la fabricación de piezas micrométricas complejas que den origen a dispositivos con aplicaciones comerciales.

  17. Effects of accuracy motivation and anchoring on metacomprehension judgment and accuracy.

    Science.gov (United States)

    Zhao, Qin

    2012-01-01

    The current research investigates how accuracy motivation impacts anchoring and adjustment in metacomprehension judgment and how accuracy motivation and anchoring affect metacomprehension accuracy. Participants were randomly assigned to one of six conditions produced by the between-subjects factorial design involving accuracy motivation (incentive or no) and peer performance anchor (95%, 55%, or no). Two studies showed that accuracy motivation did not impact anchoring bias, but the adjustment-from-anchor process occurred. Accuracy incentive increased anchor-judgment gap for the 95% anchor but not for the 55% anchor, which induced less certainty about the direction of adjustment. The findings offer support to the integrative theory of anchoring. Additionally, the two studies revealed a "power struggle" between accuracy motivation and anchoring in influencing metacomprehension accuracy. Accuracy motivation could improve metacomprehension accuracy in spite of anchoring effect, but if anchoring effect is too strong, it could overpower the motivation effect. The implications of the findings were discussed.

  18. CUALIDADES FISIOLÓGICAS Y BIOMECÁNICAS DEL JUGADOR JOVEN DE LIGA EBA

    Directory of Open Access Journals (Sweden)

    A. Vaquera

    2010-09-01

    Full Text Available

     

    RESUMEN

    El objetivo de este estudio es identificar las características morfofuncionales y de mecánica en el salto en jugadores jóvenes de Liga EBA. Lo que permitirá adecuar métodos y medios de entrenamiento para optimizar su rendimiento. En 10 jugadores de 19.3±0.7 años se determinó tanto en laboratorio como en campo, el potencial aeróbico, anaeróbico, composición corporal y características neuromusculares en la mecánica de los saltos. Con 86.8±2.6 Kg de peso corporal y 197.1±2.9 cm de talla, presentaron un porcentaje graso de 8.2±0.3%, y 50.3±0.5% muscular. En ergoespirometría alcanzaron un VO2máx de 61.2±1.3 ml.kg-1.min-1; similar al obtenido en el Course Navette (60.04±1.2 ml.kg-1.min-1 y diferente en el test de Cooper (56.9±1.7 ml.kg-1.min-1 En la bateria de saltos sobre plataforma de contacto los resultados fueron: (Abalakov=41.5±1.4 cm, SJ=32.1±1.4 cm, CMJ=35±1.2 cm, RJ30=42.4±0.8 saltos con una potencia media de 36.9±2.2 kg/w, y en el test de Wingate realizaron una potencia media absoluta de 594.6±20.2 W (6.85 w/kg, una potencia pico de 693.4±24.6 W (7.98 w/kg, y un índice de fatiga de -28.7. La valoración de estas características ha de ser un instrumento para prescribir entrenamientos más individualizados, con el objeto de obtener un mayor rendimiento.
    PALABRAS CLAVE: Baloncesto, Fisiología, Cualidad Aeróbica, Cualidad Anaeróbica; Composición corporal, VO2máx, Wingate.

    ABSTRACT

    The objective of this study is identify the functional characteristics and mechanics in the jump of young basketball players of EBA League. The findings of the study will allow adaptation of methods and means of training to reach high performance levels. In

  19. Thermal Damage on Mesenteric Vascular Tissues and Hemostatic Effects of LigaSure, Ultrasound Knife and Bipolar Electrocoagulation in Adult Goats:an Experimental Study%LigaSure、超声刀及双极电凝对山羊肠系膜血管热损伤及止血效果的实验研究﹡

    Institute of Scientific and Technical Information of China (English)

    梁军; 邢慧敏; 苗蕊; 高艳霞; 杨波

    2015-01-01

    Objective To study the thermal damage on mesenteric vascular tissues and hemostatic effects of LigaSure, ultrasound knife and bipolar electrocoagulation in adult goats for correctly choosing electeosurgical equipment in laparoscopic surgery. Methods Different mesenteric vessels ( diameters ranged from 1.03 mm to 5.44 mm) of goats were given electrocoagulations with three electeosurgical instruments (60 times in each group), and differences of the thermal damage width in 180 cases of vascular tissues were detected.The success rates of electric coagulation of vascular occlusion at one time were compared. Results The thermal damage width with LigaSure (3.30 ±0.71 mm) was less than the bipolar electrocoagulation (3.99 ±0.66 mm), but greater than the ultrasound knife (2.05 ±0.81 mm), with significant differences among them (F=109.318, P=0.000).For diameter≤3 mm vascular tissues, the success rates were higher with LigaSure [100%(32/32)] and ultrasound knife [93.8%(30/32)] than bipolar electrocoagulation [68.8%(22/32);P=0.001 and 0.010), but there was no difference between the LigaSure and the ultrasound knife (P=0.492).For diameter >3 mm vascular tissues, the success rate was the highest with LigaSure [100% (28/28)] than ultrasound knife [75.0% (21/28), P=0.010] and bipolar electrocoagulation [71.4% (20/28), P =0.004].There was no difference between ultrasound knife and bipolar electrocoagulation (P=0.763). Conclusions Among bipolar electrocoagulation, LigaSure and ultrasound knife, the thermal damage width is the largest with bipolar electrocoagulation and the least with ultrasound knife.LigaSure vessel sealing system is more reliable than ultrasound knife and bipolar electrocoagulation in sealing vessels, especially for the diameter >3 mm vascular tissues.Ultrasound knife can effectively seal the vessels less than 3 mm in diameter.%目的:探讨LigaSure、超声刀及双极电凝对山羊肠系膜血管组织的热损伤程度及止血效果,指导腹腔镜

  20. Estudo das propriedades magnetostrictivas da liga (Fe0,80Al0,20)97B3 obtida por solidificação direcional

    OpenAIRE

    Vagner de Oliveira Machado

    2014-01-01

    Neste trabalho foram obtidas barras da liga (Fe0,80Al0,20)97B3 por solidificação direcional (SD), nos diâmetros de 3 e 4 mm, com o objetivo de melhorar a magnetostricção desse material através da introdução de textura. As etapas de produção das barras envolveram a fabricação de lingotes da liga por fusão a arco L1, L2 e L6, seguida de usinagem (U) ou forjamento rotativo (F) a quente. O maior comprimento de barra obtido foi de 50 mm. Através de microscopia eletrônica de varredura e análise de ...

  1. Corrosão de liga 800GN em ambiente do circuito secundário da Central Nuclear de Angra 2

    OpenAIRE

    Fabio Abud Mansur

    2015-01-01

    A liga 800GN (grau nuclear) é um material utilizado na fabricação de geradores de vapor para reatores de água pressurizada (PWR) de usinas nucleares devido à sua elevada resistência à corrosão. A resistência à corrosão da liga 800GN é devida ao caráter protetor da película de óxido formada na superfície do tubo em contato com a água pressurizada à alta temperatura. No entanto, a corrosão tem sido a principal causa de falhas nos tubos dos geradores de vapor de usinas nucleares. Os problemas ge...

  2. Application of high frequency bipolar electrocoagulation LigaSureTM in appendix vermiformis of rabbits with or without acute inflammatory process Aplicação do eletrocoagulador bipolar de alta frequência LigaSureTM no apêndice vermiforme na vigência ou não de processo inflamatório agudo

    Directory of Open Access Journals (Sweden)

    Laura Cristina de Souza

    2012-05-01

    Full Text Available PURPOSE: To evaluate the efficacy of the use of LigaSureTM in appendectomy, with or without acute inflammatory process, and to compare with simple ligature and conventional therapy. METHODS: A total of 30 rabbits (Oryctolagus cuniculus randomly allocated in two groups, group A and B, of 15 animals each were used. The group A without acute appendicitis and the group B with acute appendicitis were submitted to appendectomy. After, the groups were subdivided into three groups, each group containing five rabbits submitted to simple ligature, conventional therapy and application of LigaSureTM. We assessed macroscopic and microscopy parameters of appendiceal stump and operative wound. RESULTS: The group with acute appendicitis that LigaSureTM was applied had fibrosis in 100% of animals, as well as in the other operative techniques used. It suggested that application of LigaSureTM is efficient as other techniques used in healing of appendiceal stump. CONCLUSIONS: The application of LigaSureTM induces the formation of fibrosis in the appendiceal stump. The technique proved efficacy to induce enough fibrous tissue to obstruct leakage of enteric content.OBJETIVO: Avaliar a eficácia da utilização do LigaSureTM na apendicectomia, com ou sem a presença de processo inflamatório agudo, comparando com ligadura simples ou técnica tradicional. MÉTODOS: Um total de 30 coelhos (Oryctolagus cuniculus foi alocado em dois grupos, grupos A e B, cada um composto por 15 animais. O grupo A não apresentava apendicite aguda e o grupo B com apendicite aguda, sendo os animais submetidos à apendicitectomia. Cada grupo foi divido em três subgrupos, cada um com cinco animais onde foram então submetidos à ligadura simples, técnica tradicional ou utilização do LigaSureTM. Foram avaliados parâmetros macroscópicos assim como microscópicos do coto apendicular assim como da ferida operatória. RESULTADOS: No grupo que apresentava apendicite aguda onde foi utilizado o

  3. 双极电凝、LigaSure 及超声刀对人子宫旁血管组织热损伤的实验研究%Experimental Study on Thermal Effects of Human Uterine Vascular Tissues by Bipolar Electrocoagulation, LigaSure and ;Ultrasound Knife

    Institute of Scientific and Technical Information of China (English)

    梁军; 邢慧敏; 刘艳; 杨波

    2016-01-01

    Objective To study the thermal damage of uterine vascular tissues by bipolar electrocoagulation , LigaSure and ultrasound knife in total laparoscopic hysterectomy ( TLH ) , and to guide the selection of electeosurgery equipments in TLH . Methods TLH was carried out in patients with myoma of uterus , adenomyosis and dysfunctional uterine bleeding .A total of 90 uterine vascular tissues were studied , including 30 tissues receiving bipolar electrocoagulation , 30 tissues receiving LigaSure electrocoagulation and 30 tissues receiving ultrasound knife dessection .The differences of the thermal damage width of uterine vascular tissues were detected. Results The thermal damage width with bipolar electrocoagulation [(4.583 ±0.538) mm] was significantly greater than the LigaSure electrocoagulation [(4.207 ±0.525) mm, q=3.654, P<0.05] and the ultrasound knife [(3.506 ± 0.623) mm, q=10.465, P<0.05].The thermal damage width with the LigaSure electrocoagulation was significantly greater than the ultrasound knife (q=6.812, P<0.05). Conclusions Bipolar electrocoagulation has the greatest thermal damage width , followed by LigaSure electrocoagulation and ultrasound knife .It is necessary to choose laparoscopic electrosurgical instruments reasonably to avoid side-injury during performance of uterine vessels in TLH .%目的:探讨腹腔镜下全子宫切除术( total laparoscopic hysterectomy , TLH)中双极电凝、LigaSure及超声刀对人子宫旁血管组织的热损伤程度,指导TLH术中合理选择电外科器械。方法对拟行TLH患者截取分别以双极电凝、LigaSure及超声刀处理的子宫旁血管组织各30块,共计90块,显微镜下测量电凝部位热损伤宽度。结果3种电外科器械对子宫旁血管组织热损伤程度不同,热损伤宽度双极电凝组(4.583±0.538)mm,明显大于LigaSure 组(4.207±0.525)mm(q=3.654,P<0.05)和超声刀组(3.506±0.623)mm(q=10.465,P<0.05

  4. La incertidumbre de los resultados en las ligas española, inglesa e italiana (2008/09 mediante el rating ELO

    Directory of Open Access Journals (Sweden)

    Sala Garrido, Ramon

    2009-01-01

    Full Text Available RESUMEN En numerosas ocasiones se discute si una determinada liga es la mejor de Europa o si es otra, pero muchas veces ese concepto de “mejor” queda indefinido y se basa en elementos subjetivos o apreciaciones. El objetivo de este trabajo es comparar las ligas, española, inglesa e italiana, utilizando el rating ELO para poder determinar cual de las ligas es más homogénea en términos de equilibrio entre los equipos.El interés de una liga depende en gran parte de que exista incertidumbre en el resultado, es decir, lo que viene a denominarse como balance competitivo entre los equipos que la forman, ya que si no es así, la competición pierde interés en la medida en que el resultado es demasiado prfevisible, es decir, que los “buenos” equipos siempre vencen a los restantes, con lo que se perjudica al espectáculo y por tanto, las ganancias que reportan los ingresos, especialmente los televisivos.ABSTRACT It is often discussed whether a particular football league (soccer in America is the best league. However, the term 'best' is often indefinite and based on subjective elements. The aim of this study is to compare the Spanish, English and Italian leagues by using the ELO rating system to determine which league is more homogeneous in terms of balance between the teams. The level of interest in a league largely depends on the uncertainty of outcome or the competitive balance between the teams. If there is a competitive imbalance between the teams then the competition loses interest because the expected results coincide with the real results, namely the 'top' teams always win against the others. This can damage the spectacle, and therefore the earnings produced – especially in the case of television.

  5. IMPROVED ACCURACY AND ROUGHNESS MEASURES FOR ROUGH SETS

    Institute of Scientific and Technical Information of China (English)

    Zhou Yuming; Xu Baowen

    2002-01-01

    Accuracy and roughness, proposed by Pawlak(1982), might draw a conclusion inconsistent with our intuition in some cases. This letter analyzes the limitations in these measures and proposes improved accuracy and roughness measures based on information theory.

  6. Photostimulated near-infrared persistent luminescence as a new optical read-out from Cr3+-doped LiGa5O8

    Science.gov (United States)

    Liu, Feng; Yan, Wuzhao; Chuang, Yen-Jun; Zhen, Zipeng; Xie, Jin; Pan, Zhengwei

    2013-01-01

    In conventional photostimulable storage phosphors, the optical information written by x-ray or ultraviolet irradiation is usually read out as a visible photostimulated luminescence (PSL) signal under the stimulation of a low-energy light with appropriate wavelength. Unlike the transient PSL, here we report a new optical read-out form, photostimulated persistent luminescence (PSPL) in the near-infrared (NIR), from a Cr3+-doped LiGa5O8 NIR persistent phosphor exhibiting a super-long NIR persistent luminescence of more than 1,000 h. An intense PSPL signal peaking at 716 nm can be repeatedly obtained in a period of more than 1,000 h when an ultraviolet-light (250–360 nm) pre-irradiated LiGa5O8:Cr3+ phosphor is repeatedly stimulated with a visible light or a NIR light. The LiGa5O8:Cr3+ phosphor has promising applications in optical information storage, night-vision surveillance, and in vivo bio-imaging. PMID:23532003

  7. Toxicidade e capacidade de ligação de proteínas Cry1 a receptores intestinais de Helicoverpa armigera (Lepidoptera: Noctuidae

    Directory of Open Access Journals (Sweden)

    Isis Sebastião

    2015-11-01

    Full Text Available Resumo: O objetivo deste trabalho foi avaliar a toxicidade e a capacidade de ligação das proteínas Cry1Aa, Cry1Ab, Cry1Ac e Cry1Ca, de Bacillus thuringiensis, a receptores intestinais de Helicoverpa armigera. Realizou-se análise de ligação das proteínas ativadas às vesículas de membrana da microvilosidade apical (VMMA do intestino médio deH. armigera, além de ensaios de competição heteróloga para avaliar sua capacidade de ligação. Cry1Ac destacou-se como a proteína mais tóxica, seguida por Cry1Ab e Cry1Aa. A proteína Cry1Ca não foi tóxica às lagartas e, portanto, não foi possível determinar os seus parâmetros de toxicidade CL50 e CL90. As proteínas Cry1Aa, Cry1Ab e Cry1Ac são capazes de se ligar a um mesmo receptor nas membranas intestinais, o que aumenta o risco do desenvolvimento de resistência cruzada. Portanto, a utilização conjunta dessas proteínas deve ser evitada.

  8. Resistência de união entre liga de níquel-cromo e cimentos resinosos

    Directory of Open Access Journals (Sweden)

    FRANÇA Rodrigo de Oliveira

    1998-01-01

    Full Text Available O objetivo do trabalho foi a determinação da retentividade, por ensaio de tração, entre uma liga de níquel-cromo e cimentos resinosos (Comspan, Panavia Ex e All-Bond C & B, com quatro tratamentos superficiais (liso, microjateado, ataque eletrolítico e silicoater e armazenagem por 3 e 30 dias em solução de NaCl a 0,9%, a 37° C e termociclagem intercalada na segunda (a 5 e 55° C, por 1 minuto em cada banho, perfazendo 600 ciclos. Os corpos de prova eram discos, providos de alça fixadora entre si dois a dois. Os resultados permitiram concluir que: superfícies lisas conduzem a baixíssimas retentividades e tratadas com silicoater a altíssimos valores, com qualquer cimento e condição de armazenagem; Panavia Ex com superfícies microjateadas também conduz a altas retentividades; a maior retentividade foi obtida pela combinação silicoater/All-Bond C&B.

  9. La liga contra la ignorancia: burguesía y educación en la Valencia de 1880

    Directory of Open Access Journals (Sweden)

    Luis M. LÁZARO LORENTE

    2010-03-01

    Full Text Available RESUMEN: «Instruid y moralizad al pueblo, y no temáis ni la explosión violenta de las pasiones populares ni el triunfo del despotismo; instruid y moralizad al pueblo, y no temáis poner en sus manos el hierro y el fuego, porque él os devolverá el primero convertido en útiles instrumentos del campo y del taller y en poderosas máquinas, y hará del segundo la fuerza que debe ponerlas en movimiento». Estos consejos de Cirilo Amorós cerraban el primer discurso de la noche. Era el día 22 de julio de 1880. En el pabellón municipal de la Feria de Julio, se estaba inaugurando de forma oficial la Liga contra la Ignorancia. La culminación de un proceso iniciado —ese mismo año— meses atrás.

  10. An Integrated Microfabricated Chip with Double Functions as an Ion Source and Air Pump Based on LIGA Technology

    Directory of Open Access Journals (Sweden)

    Hua Li

    2017-01-01

    Full Text Available The injection and ionization of volatile organic compounds (VOA by an integrated chip is experimentally analyzed in this paper. The integrated chip consists of a needle-to-cylinder electrode mounting on the Polymethyl Methacrylate (PMMA substrate. The needle-to-cylinder electrode is designed and fabricated by Lithographie, Galvanoformung and Abformung (LIGA technology. In this paper, the needle is connected to a negative power supply of −5 kV and used as the cathode; the cylinder electrodes are composed of two arrays of cylinders and serve as the anode. The ionic wind is produced based on corona and glow discharges of needle-to-cylinder electrodes. The experimental setup is designed to observe the properties of the needle-to-cylinder discharge and prove its functions as an ion source and air pump. In summary, the main results are as follows: (1 the ionic wind velocity produced by the chip is about 0.79 m/s at an applied voltage of −3300 V; (2 acetic acid and ammonia water can be injected through the chip, which is proved by pH test paper; and (3 the current measured by a Faraday cup is about 10 pA for acetic acid and ammonia with an applied voltage of −3185 V. The integrated chip is promising for portable analytical instruments, such as ion mobility spectrometry (IMS, field asymmetric ion mobility spectrometry (FAIMS, and mass spectrometry (MS.

  11. Voting for image scoring and assessment (VISA)--theory and application of a 2 + 1 reader algorithm to improve accuracy of imaging endpoints in clinical trials.

    Science.gov (United States)

    Gottlieb, Klaus; Hussain, Fez

    2015-02-19

    Independent central reading or off-site reading of imaging endpoints is increasingly used in clinical trials. Clinician-reported outcomes, such as endoscopic disease activity scores, have been shown to be subject to bias and random error. Central reading attempts to limit bias and improve accuracy of the assessment, two factors that are critical to trial success. Whether one central reader is sufficient and how to best integrate the input of more than one central reader into one output measure, is currently not known.In this concept paper we develop the theoretical foundations of a reading algorithm that can achieve both objectives without jeopardizing operational efficiency We examine the role of expert versus competent reader, frame scoring of imaging as a classification task, and propose a voting algorithm (VISA: Voting for Image Scoring and Assessment) as the most appropriate solution which could also be used to operationally define imaging gold standards. We propose two image readers plus an optional third reader in cases of disagreement (2 + 1) for ordinary scoring tasks. We argue that it is critical in trials with endoscopically determined endpoints to include the score determined by the site reader, at least in endoscopy clinical trials. Juries with more than 3 readers could define a reference standard that would allow a transition from measuring reader agreement to measuring reader accuracy. We support VISA by applying concepts from engineering (triple-modular redundancy) and voting theory (Condorcet's jury theorem) and illustrate our points with examples from inflammatory bowel disease trials, specifically, the endoscopy component of the Mayo Clinic Score of ulcerative colitis disease activity. Detailed flow-diagrams (pseudo-code) are provided that can inform program design.The VISA "2 + 1" reading algorithm, based on voting, can translate individual reader scores into a final score in a fashion that is both mathematically sound (by avoiding

  12. Target Price Accuracy

    Directory of Open Access Journals (Sweden)

    Alexander G. Kerl

    2011-04-01

    Full Text Available This study analyzes the accuracy of forecasted target prices within analysts’ reports. We compute a measure for target price forecast accuracy that evaluates the ability of analysts to exactly forecast the ex-ante (unknown 12-month stock price. Furthermore, we determine factors that explain this accuracy. Target price accuracy is negatively related to analyst-specific optimism and stock-specific risk (measured by volatility and price-to-book ratio. However, target price accuracy is positively related to the level of detail of each report, company size and the reputation of the investment bank. The potential conflicts of interests between an analyst and a covered company do not bias forecast accuracy.

  13. Rethinking Empathic Accuracy

    OpenAIRE

    Meadors, Joshua

    2014-01-01

    The present study is a methodological examination of the implicit empathic accuracy measure introduced by Zaki, Ochsner, and Bolger (2008). Empathic accuracy (EA) is defined as the ability to understand another person's thoughts and feelings (Ickes, 1993). Because this definition is similar to definitions of cognitive empathy (e.g., Shamay-Tsoory, 2011) and because affective empathy does not appear to be related to empathic accuracy (Zaki et al., 2008), the Basic Empathy Scale--which measures...

  14. Welding shape memory alloys with NdYAG lasers Soldadura de ligas de memória de forma com laser Nd-YAG

    Directory of Open Access Journals (Sweden)

    Luisa Quintino

    2012-09-01

    Full Text Available The demand of emerging joining techniques for shape memory alloys (SMA has become of great importance, as their functional properties namely shape memory effect (SME and superelasticity (SE present unique solutions for state-of-the-art applications. Welding of SMAs is a challenge due to the risk of reduced mechanical performance after laser processing. The wider application of these alloys in various sectors as aerospace, medical or electronic industry is hindered by the limitations in its processing. The need to weld SMAs to other materials is pressing for applications in the above referred sectors. In dissimilar joints the need to understand materials behavior is even more challenging since base materials have different physical properties leading to different heat flow, convection processes and residual stress distribution. The chemical composition across the weld pool varies and intermetallic compounds are formed. Research detailing the effects of laser processing on NiTi is essential to overcome many of these challenges. The objectives of the current study are to analyze the effects of laser welding in the weld shape of both similar and dissimilar joints of NiTi to stainless steel and titanium alloys.A procura de técnicas de ligação para ligas de memória de forma tem-se revetido de importância crescente, devido ao desenvolvimento de aplicações deste material com particulares propriedades de memória de forma e superelasticidade. A soldadura de ligas de memória de forma é um desafio devido ao risco de emporbrecimento das propriedades mecânicas depois do processamento laser. A aplicação alargarda destas ligas em vários sectores como o aeroespacial, medico ou electrónico é prejudicado pelas limitações de processamento. A necessidade de soldar ligas de memória de forma a outros materiais é premente para estes sectores. Em juntas dissimilares, o entendimento do comportamento dos materaias é um desafio ainda maior uma vez que

  15. Vagus-Nerv-Stimulation: Konsensuskonferenz des erweiterten Vorstandes des Österreichischen Sektion der Internationalen Liga gegen Epilepsie

    Directory of Open Access Journals (Sweden)

    Mamoli B

    2005-01-01

    Full Text Available Die Vagus-Nerv-Stimulation (VNS wurde 1997 von der FDA als Zusatztherapie zur Anfallsreduktion bei Erwachsenen und Adoleszenten über 12 Jahre mit medikamentös-refraktären partiellen Anfällen zugelassen. Aufgrund der Verbreitung der Methode hielt es die Österreichische Sektion der Internationalen Liga gegen Epilepsie für sinnvoll, einen Konsensus betreffend der Anwendung der VNS zu erarbeiten, um einerseits die Verbreitung der Methode zu fördern und andererseits eine unreflektierte Anwendung zu vermeiden. Es wurden folgende Schlüsse gezogen: 1 Die VNS stellt bei Patienten mit fokalen oder generalisierten Epilepsien, die gegenüber Antiepileptika refraktär sind und bei denen eine resektive Operationsmöglichkeit nicht gegeben ist (mit Ausnahme der ketogenen Diät die einzige therapeutische Option mit gesicherter Effizienz dar. 2 Die Responderraten liegen nach 3 Monaten bei 23 %. Offene Nachuntersuchungsstudien weisen nach 2 Jahren Beobachtungszeit einen Anstieg der Responderrate auf ca. 40 % nach. Anfallsfreiheit wird nur selten erreicht. 3 Generell wird die Implantation des VNS-Systems gut vertragen. Schwerwiegende Nebeneffekte sind selten. 4 Bei Kindern liegen bislang nur offene unkontrollierte und vorwiegend retrospektive Studien mit kleinen Fallzahlen vor. Bisherige Erfahrungen weisen darauf hin, daß die VNS bei symptomatischen, kryptogenen, fokalen und generalisierten schwer behandelbaren Epilepsien im Kindesalter auch unter 12 Jahren als Therapieoption in Erwägung zu ziehen ist. Die Verträglichkeit ist gut und mit jener bei Erwachsenen vergleichbar. 5 Eine Reduktion der ursprünglichen AED-Dosis ist vielfach möglich. 6 Hinsichtlich der Steigerung/Änderung der Stimulationsparameter bestehen derzeit keine gesicherten Daten für eine einheitliche Vorgangsweise. 7 Ökonomische Studien zeigten, daß nach VNS eine Kostenreduktion der direkten epilepsiebezogenen Kosten erfolgt. Diese ist vorwiegend durch eine Reduktion der station

  16. Retrospective comparison of Traditional vs. LigaSure impact dissection during pancreatoduodenectomy: how to save money by using an expensive device.

    Science.gov (United States)

    Piccinni, Giuseppe; Pasculli, Alessandro; D'Ambrosio, Erasmina; Gurrado, Angela; Lissidini, Germana; Testini, Mario

    2013-09-01

    Pancreatoduodenectomy is an exceptional procedure that requires an extensive dissection of the supramesocolic region extended to the first jejunal limb. Lymphadenectomy, required for cancer, increases the dissection surface. The extensive preparation of the area is traditionally conducted with bipolar ormonopolar instruments, while clips, ligatures, and sutures are used for haemostasis. LigaSure™ vessel sealing(LSVS; Valleylab, Boulder, CO) is a technology that obtains vessel closure by using the body's own collagen and elastin to create a permanent fusion zone. This is obtained by a combination of forceps pressure and radio frequency. This effect has been improved by the introduction of the Force Triad™ (Valleylab, Boulder,CO) energy platform, controlled by TissueFect™ (Valleylab, Boulder, CO) sensing technology. With this device, the surgeon is able to fuse vessels up to 7 mm, lymphatics, tissue bundles, and pulmonary vasculature in a fast-seal cycle of almost 4 seconds. In our daily practice of open surgery we observe a rapid improvement of abdominal drainage output with a drastic reduction of protein loss. Its practical significance is, in our opinion, that we obtain a rapid recovery of normal serum protein levels with a low number of blood/plasmasac transfusions and a real improvement of anastomosis healing. Moreover, the efficacy and the speed of work of the device allow us to reduce the operating time significantly but safely. We performed a retrospective analysis of the data of 20 pancreatic resections conducted both with traditional dissection and with the Liga-Sure Impact device with Force Triad platform in order to verify whether observed data were real. Our clinical results show that the use of the LigaSure Impact device with Force Triad energy platform is really useful in open surgery to save operating time, number of postoperative days, and hemoderivate administration.

  17. A Review of Sodar Accuracy

    DEFF Research Database (Denmark)

    Bradley, Stuart; Mikkelsen, Torben

    2012-01-01

    be large. On a uniform terrain site, differences between a SODAR and a mastmounted cup anemometer will arise due to turbulent fluctuations and wind components being measured in different spaces, as well as to variable background noise. We develop theories for turbulence-related random fluctuations due......What accuracy and reliability can today be expected from SODAR wind measurements? Is there traceable evidence for performance? Environmental factors, turbulent fluctuations and non-uniform terrain all affect the wind speed uncertainty. So site-to-site variations for SODAR-mast comparisons can...

  18. Evaluating measurement accuracy a practical approach

    CERN Document Server

    Rabinovich, Semyon G

    2017-01-01

    This book presents a systematic and comprehensive exposition of the theory of measurement accuracy and provides solutions that fill significant and long-standing gaps in the classical theory. It eliminates the shortcomings of the classical theory by including methods for estimating accuracy of single measurements, the most common type of measurement. The book also develops methods of reduction and enumeration for indirect measurements, which do not require Taylor series and produce a precise solution to this problem. It produces grounded methods and recommendations for summation of errors. The monograph also analyzes and critiques two foundation metrological documents, the International Vocabulary of Metrology (VIM) and the Guide to the Expression of Uncertainty in Measurement (GUM), and discusses directions for their revision. This new edition adds a step-by-step guide on how to evaluate measurement accuracy and recommendations on how to calculate systematic error of multiple measurements. There is also an e...

  19. Propriedades estruturais, eletrônicas e termodinâmicas dos nitretos do grupo-III e de suas ligas

    OpenAIRE

    2001-01-01

    Neste trabalho foram efetuados estudos importantes e pioneiros sobre as propriedades estruturais, eletrônicas e termodinâmicas dos nitretos e de suas ligas, através de dois métodos de primeiros princípios distintos, o FLAPW (\\"Full-potential Linear Augmented Plane Wave\\") e o pseudopotencial combinado com a aproximação quasequímica generalizada. Na primeira parte, utilizando o método FLAPW, calculamos as estruturas de bandas para os nitretos cúbicos do grupo-IH, BN, AIN, GaN e InN. Foram obt...

  20. "Estudos do desenvolvimento e caracterização das ligas Cu-Ni-Pt e Cu-Ni-Sn para fins eletro-eletrônicos"

    OpenAIRE

    Luis Carlos Elias da Silva

    2006-01-01

    O Cu e suas ligas têm diferentes aplicações na sociedade moderna devido as excelentes propriedades elétricas, condutividade térmica, resistência à corrosão dentre outras propriedades. Estas aplicações podem ser em válvulas, tubulações, panelas para absorção de energia solar, radiadores para automóveis, condutores de corrente e eletrônico, elementos de termostatos e partes estruturais de reatores nucleares, como, por exemplo, bobinas para campo toroidal para um reator de fusão nuclear. Dentre ...

  1. Dialética do processo de trabalho da liga de hipertensão arterial Dialetic to the labour process in the hypertension league

    OpenAIRE

    Marcia Regina Car; Emiko Yoshikawa Egry

    1996-01-01

    Buscou-se compreender o fenômeno da assistência à saúde desenvolvida na Liga de Diagnóstico e Tratamento da Hipertensão Arterial do Hospital das Clínicas da Faculdade de Medicina da USP,evidenciando suas contradições através da articulação dos elementos constitutivos deste processo de trabalho,contidos nos depoimentos de seus agentes. As concepções dos agentes sobre este processo de trabalho expressaram uma práxis reiterativa, consagrando e consolidando um dado saber específico que,para além ...

  2. Avaliação da geometria de ferramenta e parâmetros do processo FSW na soldagem da liga de alumínio AA 5052

    OpenAIRE

    2009-01-01

    A soldagem de ligas de alumínio sem degradação excessiva das propriedades originais do metal base apresenta-se como um obstáculo a ser superado pelas indústrias em seus processos de fabricação, uma vez que o alumínio tem sido usado cada vez de forma mais intensiva. Neste sentido, o processo de soldagem denominado Friction Stir Welding (FSW) tem recebido atenção por suas potencialidades onde o aporte de calor deve ser minimizado ou quando metais dissimilares devem ser soldados. Neste processo,...

  3. Resistência ao cisalhamento entre ligas metálicas e materiais compostos para revestimento estético: cerômero e polímero de vidro

    OpenAIRE

    Itinoche,Marcos Koiti; Kimpara, Estevão Tomomitsu; Bottino,Marco Antonio; Neisser, Maximiliano Piero; Oyafuso,Denise Kanashiro

    2010-01-01

    O propósito deste trabalho foi avaliar a resistência ao cisalhamento entre ligas metálicas (Au, NiCr e CoCr) e materiais estéticos indiretos (Artglass e Targis). Para tanto, utilizaram-se vinte estruturas metálicas de cada tipo de liga, cuja superfície a ser aplicada os materiais estéticos, receberam jateamento com óxido de alumínio de granulação de 250mm, antes da aplicação do sistema adesivo do corresp...

  4. A re-ligação: o encontro das religiões e o cristianismo na Teologia Teoantropocósmica

    Directory of Open Access Journals (Sweden)

    Paulo Agostinho Nogueira Baptista

    2009-05-01

    Full Text Available Vive-se uma demanda por integração, por solidariedade. As religiões e o cristianismo, em especial, podem respondem a esse desafio? A visão de re-ligação de Leonardo Boff, à luz do paradigma ecológico, abre novas perspectivas para as religiões, especialmente para a experiência cristã e seu papel no contexto atual. Objetiva-se aqui refletir sobre o significado do encontro das religiões ante os desafios oferecidos pela realidade ecológica, propiciando uma visão teológica teoantropocósmica.Palavras-chave: Re-ligação; Religião; Cristianismo; Paradigma ecológico; Teologia Teoantropocósmica; Diálogo.ABSTRACTNowadays there is a demand for integration and solidarity. Can religions and Christianity, in particular, meet this challenge? Leonardo Boff’s vision of re-connection, in the light of the ecological paradigm, opens new perspectives to religions, mainly to the Christian esperience and its role in the present scope. This article iams at reflecting upon the meaning of encounter of religions in face of challenges presented by the ecological reality, offering a theoanthropocosmic theological view.Key words: Re-connection, Religion, Christianity, Ecological paradigm, Theoanthropocosmic Theology and Dialogue.

  5. Design and simulation of non-resonant 1-DOF drive mode and anchored 2-DOF sense mode gyroscope for implementation using UV-LIGA process

    Science.gov (United States)

    Verma, Payal; Gopal, Ram; Butt, M. A.; Khonina, Svetlana N.; Skidanov, Roman V.

    2016-03-01

    This paper presents the design and simulation of a 3-DOF (degree-of-freedom) MEMS gyroscope structure with 1-DOF drive mode and anchored 2-DOF sense mode, based on UV-LIGA technology. The 3-DOF system has the drive resonance located in the flat zone between the two sense resonances. It is an inherently robust structure and offers a high sense frequency band width and high gain without much scaling down the mass on which the sensing comb fingers are attached and it is also immune to process imperfections and environmental conditions. The design is optimized to be compatible with the UV-LIGA process, having 9 μm thick nickel as structural layer. The electrostatic gap between the drive comb fingers is 4 μm and sense comb fingers gap are 4 μm/12 μm. The damping effect is considered by assuming the flexures and the proof mass suspended about 6 μm over the substrate. Accordingly, mask is designed in L-Edit software.

  6. PERFIL DE RENDIMIENTO TÉCNICO DEL EQUIPO TETRACAMPEÓN DE LA LIGA SUPERIOR DE BALONCESTO DE COSTA RICA

    Directory of Open Access Journals (Sweden)

    Braulio Sánchez Ureña

    2011-12-01

    Full Text Available El propósito de este estudio fue analizar y contrastar el perfil de rendimiento técnico del equipo tetracampeón de la Liga Superior de Baloncesto de Costa Rica. Se registró 142 juegos a lo largo de las temporadas 2007, 2008 y 2009. Los indicadores de rendimiento escogido fueron: lanzamientos de dos y tres puntos (convertidos, fallados, porcentaje de efectividad, lanzamientos de tiro libre (convertidos, fallados, porcentaje de efectividad, puntos, rebotes defensivos y ofensivos, faltas, pérdidas de balón, asistencias y robos de balón. La descripción de la información se basó en valores de frecuencia absoluta y relativa. El contraste de datos por temporada y periodo de juego se hizo con base en las técnicas no paramétricas U-test, test de Friedman y el Chi 2. En todos los casos se utilizó el SPSS versión 15.0 con un nivel de significancia de p ≤ 0,05. Los resultados mostraron un mejor perfil de rendimiento técnico en la temporada 2008, caracterizándose por mejores porcentajes en tiros de 2, tiros libres, menor número de pérdidas de balón y mayor cantidad de robos del balón y asistencias. En relación con el periodo de juego, el equipo mostró un mejor perfil de rendimiento técnico durante los segundos tiempos del partido. En general, el porcentaje de efectividad de tiros de 2 y tiros libres estuvo arriba del 60 % en ambos periodos de juego, mientras que el porcentaje de tiros de 3 osciló entre el 26.4 % y el 29.2 %. En conclusión, el equipo mostró un perfil de rendimiento técnico similar al reportado en la literatura y deja clara evidencia de la importancia que tiene el registro y seguimiento de los indicadores de rendimiento técnico en el baloncesto.

  7. Soldagem por ponto no estado sólido de ligas leves Solid state spot welding of lightweight alloys

    Directory of Open Access Journals (Sweden)

    Leonardo Contri Campanelli

    2011-09-01

    Full Text Available A recente preocupação quanto às mudanças climáticas vem impulsionando pesquisas em eficiência energética dos meios de transportes no sentido de reduzir a emissão de gases. Uma das principais soluções consiste na redução do peso estrutural através da aplicação de novos materiais, como as ligas leves de alumínio e magnésio. Entretanto, novos usos ficam muitas vezes limitados pela dificuldade de união desses materiais. A técnica de soldagem por fricção e mistura (FSW é um processo de união no estado sólido que surge como uma alternativa viável para substituir ou complementar as tecnologias de união consagradas. Como uma junta contínua não é sempre a requisitada, duas tecnologias de união por ponto derivadas do FSW estão em desenvolvimento: soldagem por fricção e mistura por ponto (FSSW e soldagem por fricção por ponto (FSpW. Além de fornecerem juntas de elevada resistência e praticamente isentas de defeitos, estas técnicas apresentam alta eficiência energética, curto ciclo de soldagem, facilidade de automação e compatibilidade com o meio-ambiente, fazendo frente às técnicas convencionais de união por ponto, como a soldagem por resistência por ponto (RSW e a rebitagem.The recent concern about climate change has stimulated research into transport energy efficiency in order to reduce the emission of gases. One of the main solutions is to reduce the structural weight through the application of new materials, such as aluminum and magnesium lightweight alloys. However, new applications are often limited by the difficulty of joining these materials. Friction Stir Welding (FSW is a solid state joining technique that emerges as a viable alternative to replace or complement the established joining technologies. As a continuous weld is not always requested, two spot welding technologies derived from FSW are under development: Friction Stir Spot Welding (FSSW and Friction Spot Welding (FSpW. Besides providing

  8. Accuracy of Sphygmomanometers

    OpenAIRE

    Basak, Okay

    2014-01-01

    One of the factors affecting the accuracy of readings of blood pressure is the equipment used. Defects or inaccuracy of aneroid sphygmomanometers may be source of error in blood pressure measurement. We inspected 100 sphygmomanometers for physical defects and assessed their accuracy against a standard mercury manometer at four different pressure points. 46 of the 100 sphygmomanometers were determined to be intolerant (deviation from the mercury manometer by greater than±3 mm Hg at two or more...

  9. Avaliação da Capacidade de Decisão em Psiquiatria de Ligação

    Directory of Open Access Journals (Sweden)

    Filipe Lopes Vicente

    2017-03-01

    Full Text Available Introdução: Entre as funções do psiquiatra de ligação, encontra-se a avaliação da capacidade de decidir. Esta envolve a capacidade de fazer escolhas de forma autónoma e surge de forma relevante na prática clínica diária como pré-condição ao consentimento informado. Objetivos: Os autores pretendem rever o pro- cesso subjacente à avaliação da capacidade de decisão, assim como outra informação relevante publicada a este respeito. Métodos: Revisão não sistemática da literatura através da pesquisa eletrónica nos motores de busca Medline/Pubmed. Resultados: A capacidade de decidir apenas pode ser avaliada relativamente a uma decisão em particular, sendo que o seu resultado não é necessariamente estável ao longo do tempo. Da mesma forma, não existe nenhum diagnóstico que permita concluir, por si só, pela incapacidade para decidir ou que possibilite prescindir da sua avaliação. Depende de vários fatores: conteúdo, forma do pensa- mento e funções cognitivas. Pode igualmente ser influenciada pelo nível de instrução do indivíduo,  traços  da  personalidade,  estados emocionais/mecanismos de coping ou fatores circunstanciais. Qualquer  médico  deverá  estar  habilitado para  a  realização  desta  avaliação.  O  psiquiatra  de  ligação  deve  ser  envolvido  perante  a  suspeita  de  doença  mental  capaz de  prejudicar  a  capacidade  de  consentir ou  perante  a  necessidade  de  validar  uma avaliação já realizada. Appelbaum e Grisso propuseram  uma  avaliação  sistematizada segundo os seguintes critérios: a comunicação da escolha, b compreensão, c apreciação  e  d  processo  de  decisão  racional/ raciocínio.  Numa  tentativa  de  minimizar diferenças entre avaliadores, foram desenvolvidos vários instrumentos de avaliação, entre os quais se destaca a MacArthur Competence  Assessment  Tool.  Particularmente nos doentes com d

  10. Restaurações com amálgama: análise rugosimétrica utilizando-se cinco tipos de ligas e quatro técnicas de polimento

    Directory of Open Access Journals (Sweden)

    CENTOLA André Luiz Baracchini

    2000-01-01

    Full Text Available Os autores estudaram o efeito de quatro diferentes técnicas de polimento de restaurações de amálgama feitas em laboratório com duas ligas convencionais e três ligas com alto teor de cobre, sendo o polimento realizado no tempo de 168 horas após a condensação. A utilização de brocas multilaminadas para o acabamento superficial dos corpos-de-prova exibiu níveis de rugosidade semelhante aos corpos-de-prova não polidos. No tocante às ligas utilizadas, a liga DFL mostrou os mais altos valores de rugosidade superficial, enquanto a liga GS 80 exibiu os melhores valores. A trituração foi efetuada segundo a indicação dos fabricantes e o amálgama foi condensado em uma matriz de aço fabricada especialmente para a pesquisa. A matriz tinha uma cavidade de 4,0 mm de diâmetro com 2,0 mm de profundidade. Cinco minutos após a condensação, foi feita a escultura com uma lâmina de aço e em seguida a brunidura. Depois de 25 minutos, o corpo-de-prova de amálgama era retirado utilizando-se um parafuso da própria matriz. Então, 168 h após a condensação, os corpos-de-prova eram polidos e submetidos aos testes de rugosimetria.

  11. The Truth about Accuracy

    NARCIS (Netherlands)

    Buekens, F.A.I.; Truyen, Frederick; Martini, Carlo; Boumans, Marcel

    2014-01-01

    When we evaluate the outcomes of investigative actions as justified or unjustified, good or bad, rational or irrational, we make, in a broad sense of the term, evaluative judgements about them. We look at operational accuracy as a desirable and evaluable quality of the outcomes and explore how the c

  12. Granulation of core particles suitable for film coating by agitation fluidized bed III. Effect of scale, agitator rotational speed and blade shape on granule properties and development of a high accuracy scale-up theory.

    Science.gov (United States)

    Hamashita, Tomohiro; Ono, Tetsuo; Ono, Masaki; Tsunenari, Yoshinobu; Aketo, Takao; Watano, Satoru

    2009-04-01

    The preparation of core particles suitable for subsequent film coating was examined using different scales of agitation fluidized beds. Specifically, the effects of agitator rotational speed and agitator blade shape in different scales of granulators on granule properties such as mass median diameter, apparent density, friability and shape factor were studied. As the agitator rotational speed was increased or when the agitator blade height and angle were large, the mass median diameter and friability of the granules decreased, while the apparent density and shape factor increased, in a manner independent of the vessel size because the granules were subjected to greater compression, shearing and rolling effects. The same core particles could not be prepared using granulators with different vessel sizes by simply adopting a conventional scale-up theory(1,2)) based on kinetic energy similarity. Here, a novel scale-up theory that takes into account agitator blade shape factors is proposed.(3)) When the two scale-up theories were compared, our new theory was capable of predicting the granule properties more accurately than the conventional theory. By adopting this novel theory, the same core particles could be prepared under different operating conditions in any scale of granulator.

  13. Solidificação rápida e avaliação de estabilidade de fases de ligas Ti-Si-B

    OpenAIRE

    Katia Cristiane Gandolpho Candioto

    2009-01-01

    Materiais com fases intermetálicas têm sido avaliados para aplicações estruturais em altas temperaturas devido à baixa massa específica e interessantes propriedades de resistência mecânica e resistência à oxidação de vários compostos. As ligas de Ti são reconhecidas pela sua excelente combinação de alta-resistência, baixa massa específica e alta resistência à corrosão. Tendo em vista a importância de estudos em temperaturas na faixa de 700 a 1000 oC para futuras aplicações, avaliou-se neste t...

  14. Obtenção e caracterização mecanico-metalurgica da liga Al-4,5 wt% Cu no estado reofundido

    OpenAIRE

    Eugenio Jose Zoqui

    1995-01-01

    Resumo: Este trabalho teve como objetivo a obtenção de estruturas reofirndidas da liga Al-4,5wt%Cu, sua caracterização macro e microestrutural, bem como de suas propriedades mecânicas por ensaios de tração e análise de superficies de fratura; e sua comparação com estruturas fundidas. Reofundidos com diferentes tamanhos de grãos e glóbulos foram produzidospor método de tratamento isotérmico à temperaturasuperior à solidus a partir de estruturas fundidas com diferentes tamanhos de grãos e de ...

  15. Doenças sexualmente transmissíveis e o HIV/AIDS: enfermagem discutindo essas ligações perigosas para as mulheres

    Directory of Open Access Journals (Sweden)

    Iara de Moraes Xavier

    2001-03-01

    Full Text Available Este artigo tem como objetivo principal discutir as ligações perigosas entre as DSTs e o HIV/AIDS pelo prisma do gênero e da sexualidade. Apresenta a feminização da AIDS no Brasil como produto das relações sociais, econômicas, políticas e culturais. Pesquisa descritiva exploratória de natureza qualitativa. Focaliza mulheres com HIV/AIDS que se contaminaram através de relações sexuais com parceiros fixos e únicos. Conclui que o cuidado de enfermagem, no contexto do processo saúde-doença, constitui-se em uma das principais oportunidades para a (o enfermeira (o trabalhar o diagnóstico precoce, o tratamento e a prevenção das DSTs e da AIDS.

  16. A 90 años de la fundación de la Liga Feminista Costarricense: los derechos políticos

    Directory of Open Access Journals (Sweden)

    Marta E. Solano Arias

    2014-01-01

    Full Text Available : Repaso de los derechos políticos de las mujeres con motivo del 90 aniversario de la fundación de la Liga Feminista Costarricense el 12 de octubre de 1923 en el Colegio Superior de Señoritas. El artículo ofrece un breve recorrido histórico de la participación de mujeres en hechos sociales y políticos relacionados con procesos electorales y la demanda del derecho el sufragio para las mujeres durante las primeras décadas del siglo XX y hasta 1925 en Costa Rica. Destaca algunas acciones de dos sufragistas descollantes durante los años 1912 a 1925, Ángela Acuña y Sara Casal.

  17. A New Self-assembly Metal CMG Discriminator by Multi-exposure LiGA Like Process and Sacrificial Layer Process

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The counter-meshing gears (CMG) discriminator is amechanically ceded lock, which is used to prevent the occurrenceof High Censequence Events. Tnis paper advanced a new kind of self- asesembly metal CMG discriminator based on multi-exposure LiGA like process and sacrificial layer process. The new CMG discriminator has the followingcharacters except low cost: 1) it has only diserimination teeth sectins; 2) the thickness of each gear layer exceedsone hundred micrometers; 3) it is axially driven by a separate electronic magnetic micromotor direetly; 4) its CMG is made of metal and is batch fabricated in theassembled state; 5) it is prevented from rotating in the opposite direction by pawl/ratchet wheel mechanism; 6) it has simpler structure. This device has better strength and reliability in abnormal environment comppared to the existing surface micro machining (SMM) discriminator.

  18. Emprego de ligas de cobre como detector eletroquímico de aminoácidos em cromatografo de íons

    OpenAIRE

    Victor Costa Bassetto

    2014-01-01

    Esta dissertação apresenta os desenvolvimentos realizados para a aplicação de ligas de cobre como detector de aminoácidos em cromatografia de íons. O trabalho apresenta o desenvolvimento desde estudos eletroquímicos fundamentais, onde a propriedade de metais como ouro, atual padrão para a técnica, e cobre são investigados frente aos aminoácidos. Neste passo a técnica de voltametria cíclica foi escolhida, pois permitiu explorar os vários fenômenos que ocorrem nos processos de óxido redução das...

  19. Resistência à corrosão de ligas Ni-Cr-Mo em meios fluoretados para aplicações odontológicas

    OpenAIRE

    Silva, José Wilson De Jesus

    2011-01-01

    Um grande número de ligas metálicas é usado na Odontologia para fabricação de próteses fixas e removíveis. Na cavidade oral essas estruturas estão expostas a um meio quimicamente adverso, com a saliva sendo o agente mais corrosivo, devido à alta concentração de íons cloreto que são causadores de corrosão localizada. Além disso, soluções contendo íons fluoreto também são frequentemente utilizadas em agentes profiláticos nos tratamentos dentários para prevenir a formação de placas dentárias e o...

  20. Microhardness of Ni-Cr alloys under different casting conditions Microdureza de ligas de Ni-Cr fundidas sob diferentes condições

    Directory of Open Access Journals (Sweden)

    José Roberto de Oliveira Bauer

    2006-03-01

    Full Text Available This study evaluated the microhardness of Ni-Cr alloys used in fixed prosthodontics after casting under different conditions. The casting conditions were: (1-flame/air torch flame made of a gas/oxygen mixture and centrifugal casting machine in a non-controlled casting environment; (2-induction/argon electromagnetic induction in an environment controlled with argon; (3-induction/vacuum electromagnetic induction in a vacuum environment; (4-induction/air electromagnetic induction in a non-controlled casting environment. The 3 alloys used were Ni-Cr-Mo-Ti, Ni-Cr-Mo-Be, and Ni-Cr-Mo-Nb. Four castings with 5 cylindrical, 15 mm-long specimens (diameter: 1.6 mm in each casting ring were prepared. After casting, the specimens were embedded in resin and polished for Vickers microhardness (VH measurements in a Shimadzu HMV-2 (1,000 g for 10 s. A total of 5 indentations were done for each ring, one in each specimen. The data was subjected to two-way ANOVA and Tukey's multiple comparison tests (alpha = 0.05. The VH values of Ni-Cr-Mo-Ti (422 ± 7.8 were statistically higher (p 0.05 and lower than the values obtained in the conditions induction/air and flame/air torch (p 0.05. The microhardness of the alloys is influenced by their composition and casting method. The hardness of the Ni-Cr alloys was higher when they were cast with the induction/air and flame/air torch methods.Este estudo avaliou a microdureza de ligas de Ni-Cr usadas em prótese fixa fundidas sob diferentes condições. As condições de fundição foram: (1-maçarico chama composta por uma mistura de gás/oxigênio e centrífuga sem o controle do ambiente de fundição; (2-indução/argônio indução eletromagnética com o ambiente controlado com argônio; (3-indução/vácuo indução eletromagnética com o ambiente sob vácuo; (4-indução/ar indução eletromagnética sem o controle da atmosfera. Foram utilizadas três ligas: Ni-Cr-Mo-Ti, Ni-Cr-Mo-Be e Ni-Cr-Mo-Nb. Foram realizadas 4

  1. Reconceptualizing metacomprehension calibration accuracy

    OpenAIRE

    Egan, Rylan Graham

    2012-01-01

    Accurate judgment of text comprehension is compulsory for learners to effectively self-regulate learning from text. Unfortunately, until relatively recently the literature on text comprehension judgment, termed metacomprehension, has shown learners to be inaccurate in their judgments. Over the last decade researchers have discovered that when learners use delayed summaries of text to make judgments metacomprehension accuracy increases. In contrast, when learners use individual differences (e....

  2. Geoid undulation accuracy

    Science.gov (United States)

    Rapp, Richard H.

    1993-01-01

    The determination of the geoid and equipotential surface of the Earth's gravity field, has long been of interest to geodesists and oceanographers. The geoid provides a surface to which the actual ocean surface can be compared with the differences implying information on the circulation patterns of the oceans. For use in oceanographic applications the geoid is ideally needed to a high accuracy and to a high resolution. There are applications that require geoid undulation information to an accuracy of +/- 10 cm with a resolution of 50 km. We are far from this goal today but substantial improvement in geoid determination has been made. In 1979 the cumulative geoid undulation error to spherical harmonic degree 20 was +/- 1.4 m for the GEM10 potential coefficient model. Today the corresponding value has been reduced to +/- 25 cm for GEM-T3 or +/- 11 cm for the OSU91A model. Similar improvements are noted by harmonic degree (wave-length) and in resolution. Potential coefficient models now exist to degree 360 based on a combination of data types. This paper discusses the accuracy changes that have taken place in the past 12 years in the determination of geoid undulations.

  3. Grey System Forecast for Firing Accuracy of Gun

    Institute of Scientific and Technical Information of China (English)

    CHENG Qi-yue; QIU Wan-hua

    2001-01-01

    In this paper, the system and subsystem forecast models for firing accuracy have been built by means of theory of Grey System Forecast. It has provided a scientific forecasting method for micro-errorcontrol and macro-error-control and improving the firing accuracy.

  4. Restauração metalocerâmica: um estudo comparativo da compatibilidade térmica de ligas Ni-Cr e porcelanas odontológicas

    Directory of Open Access Journals (Sweden)

    ROLLO João Manuel Domingos de Almeida

    1999-01-01

    Full Text Available Uma das aplicações tecnológicas em que é necessário haver compatibilidade entre um material cerâmico e um material metálico é a confecção de restaurações odontológicas do tipo metalocerâmica. Neste caso, uma porcelana é fundida sobre um substrato metálico para obtenção da prótese de um dente. O requisito fundamental para o sucesso da união metalocerâmica é a adequação dos coeficientes de expansão térmica de cada um dos materiais, de forma a se obter um estado de tensão de compressão adequado na camada cerâmica. Este trabalho propôs-se a levantar as curvas de expansão térmica de ligas Ni-Cr e porcelanas odontológicas, através da técnica de dilatometria e verificar a possível compatibilidade térmica dos pares metal/cerâmica. Simulando a entrada de um novo produto no mercado, desenvolveu-se uma liga Ni-Cr experimental denominada SR, que foi comparada a uma liga comercial de Ni-Cr bastante utilizada em restaurações metalocerâmicas. A partir da análise das curvas de expansão térmica, foi possível verificar a compatibilidade dos pares metal/cerâmica quanto à dilatação térmica, segundo os conceitos preconizados por YAMAMOTO7 (1985. Sob este aspecto, a liga experimental apresentou valores que a incluem como mais uma opção na família de ligas Ni-Cr para utilização em restaurações metalocerâmicas. Os resultados obtidos indicam que o equipamento e a metodologia utilizados são adequados para análise comparativa da compatibilidade térmica entre ligas metálicas Ni-Cr e porcelanas odontológicas.

  5. Territoriality as a factor associated with home advantage. A comparative study by regions in professional Spanish football and futsal leagues La territorialidad como factor asociado a la ventaja de jugar en casa. Un estudio comparativo por regiones en la liga de fútbol y en la liga de fútbol sala de España

    Directory of Open Access Journals (Sweden)

    J. Sampedro

    2011-06-01

    Full Text Available

    The aim of this research was to study home advantage in the professional Spanish football and futsal leagues in a general way, and to make a regional analysis to identify geographical variations and whether they can be interpreted in terms of territoriality as a factor associated with home advantage. Last fifteen seasons were examined, after the introduction of the current system of three points for a win in 1995-96. Home advantage found in the two leagues under study was close to the worldwide figure in football. Individual analysis after controlling team ability showed no significant differences between any of the teams. The analysis of specific regions from elsewhere in the country only showed significant differences that can be interpreted in terms of territoriality in Catalonia within futsal league. Catalan teams also presented the highest values for home advantage in the football league. This suggests considering Catalonia for future work as a region likely to be studied individually in terms of territoriality.
    Key Words:Home advantage, territoriality, regions, football, futsal

    El propósito de la investigación fue estudiar la ventaja de jugar en casa en la Liga de Fútbol Profesional y en la Liga Nacional de Fútbol Sala de España de modo general, y realizar un análisis por regiones para determinar qué variaciones geográficas se dan y si éstas pueden ser interpretadas en términos de la territorialidad como factor asociado a la ventaja de jugar en casa. Se estudiaron las últimas quince temporadas disputadas desde la implantación del sistema actual de tres puntos por victoria en la temporada 1995-96. Se encontró ventaja de jugar en casa en las dos ligas, con valores próximos a la media mundial del fútbol. El análisis individual tras ajustar el nivel de los equipos no mostró diferencias significativas entre los diferentes conjuntos. El análisis comparativo por

  6. Coordinate metrology accuracy of systems and measurements

    CERN Document Server

    Sładek, Jerzy A

    2016-01-01

    This book focuses on effective methods for assessing the accuracy of both coordinate measuring systems and coordinate measurements. It mainly reports on original research work conducted by Sladek’s team at Cracow University of Technology’s Laboratory of Coordinate Metrology. The book describes the implementation of different methods, including artificial neural networks, the Matrix Method, the Monte Carlo method and the virtual CMM (Coordinate Measuring Machine), and demonstrates how these methods can be effectively used in practice to gauge the accuracy of coordinate measurements. Moreover, the book includes an introduction to the theory of measurement uncertainty and to key techniques for assessing measurement accuracy. All methods and tools are presented in detail, using suitable mathematical formulations and illustrated with numerous examples. The book fills an important gap in the literature, providing readers with an advanced text on a topic that has been rapidly developing in recent years. The book...

  7. Evaluating measurement accuracy a practical approach

    CERN Document Server

    Rabinovich, Semyon G

    2013-01-01

    The goal of Evaluating Measurement Accuracy: A Practical Approach is to present methods for estimating the accuracy of measurements performed in industry, trade, and scientific research. From developing the theory of indirect measurements to proposing new methods of reduction, transformation, and enumeration, this work encompasses the full range of measurement data processing. It includes many examples that illustrate the application of general theory to typical problems encountered in measurement practice. As a result, the book serves as an inclusive reference work for data processing of all types of measurements: single and multiple, combined and simultaneous, direct (both linear and nonlinear), and indirect (both dependent and independent). It is a working tool for experimental scientists and engineers of all disciplines who work with instrumentation. It is also a good resource for natural science and engineering students and for technicians performing measurements in industry. A key feature of the book is...

  8. A liga republicana das mulheres portuguesas e a enfermagem no século xx: leituras na imprensa feminista La “Liga Republicana das Mulheres Portuguesas” y la enfermería in el siglo XX: lecturas en los periódicos feministas The “Liga Republicana das Mulheres Portuguesas” and nursing profession in the XXth century: readings in the feminist press

    Directory of Open Access Journals (Sweden)

    Ana Maria Barros Pires

    2012-12-01

    Full Text Available As representações que a sociedade associa à profissão de enfermagem e à enfermeira, muitas vezes contraditórias, persistem no imaginário individual e coletivo e pouco têm a ver com a evolução verificada no âmbito do exercício profissional, do ensino e da academia. As imagens associadas à enfermeira e à enfermagem inscrevem-se na memória dum passado mais ou menos longínquo e poderão ter uma justificação histórica, social e cultural. Desvendar do modo como as representações sociais associadas à enfermeira e à enfermagem se constituíram no passado poderá permitir-nos recriar, no presente, o percurso da nossa identidade profissional e compreender como, enquanto grupo social, produzimos, consumimos, divulgamos e assumimos imagens que definem essa própria identidade. Propomo-nos neste artigo dar a conhecer como a Liga Republicana das Mulheres Portuguesas (LRMP, no início do século XX, criou uma imagem positiva da enfermagem, desenvolvendo um discurso elogioso da profissão captando o interesse das mulheres para uma “profissão digna” que lhes possibilitaria a independência económica em caso de abandono ou viuvez. Utilizaremos um conjunto de artigos publicados na imprensa oficial da Liga: A Mulher e A Criança e A Madrugada dado que a imprensa foi uma importante forma de divulgação e doutrinação das ideias feministas.Las representaciones que la sociedad asocia con la profesión de enfermería y a la enfermera, a menudo contradictorias, persisten en el imaginario individual y colectivo y tienen poco que ver con la evolución en el campo profesional, la educación y la academia. Las imágenes asociadas con la enfermera y la enfermería están registradas en la memoria de un pasado más o menos lejano y pueden tener una justificación histórica, cultural y social. Descubrir cómo las representaciones asociadas con la enfermería y la enfermera se constituyeron nos permitirá recrear el curso de nuestra identidad

  9. Theory and Experiment of Industrial Robot Accuracy Compensation Method Based on Spatial Interpolation%基于空间插值的工业机器人精度补偿方法理论与试验

    Institute of Scientific and Technical Information of China (English)

    周炜; 廖文和; 田威

    2013-01-01

    随着工业机器人技术的不断发展,机器人在工业领域得到了越来越广泛的应用.针对机器人普遍存在重复定位精度高、绝对定位精度低的特点,提出一种改进其绝对定位精度的方法.以D-H运动学模型为基础建立机器人坐标系,并综合考虑机器人各关节参数引入的误差,建立机器人的位姿误差模型.利用该误差模型,通过分析相邻两点间定位误差之间的内在关联提出了定位误差相似度的概念,并在此基础上提出一种基于空间插值的工业机器人精度补偿方法.利用KUKA机器人对提出的精度补偿方法进行验证,试验结果表明,补偿前机器人的绝对定位精度为1~3mm,补偿后它的绝对定位误差的最大值为0.386 mm,平均值为0.156 mm,较未补偿前有了近一个数量级的提高,从而证明了该方法的可行性和有效性.%With the development of technology of robot, industrial robot is used more and more widely in the industrial field. The industrial robot usually has a high repeat positioning accuracy and a low absolute positioning accuracy. According to Denavit-Hartenberg kinematics model, the robot coordinate system is established, meanwhile the geometric error model is also established by taking account of errors introduced in joint parameters. The inner relationship between positioning accuracy of two adjacent points is discussed by using the error model, and therefore the concept of positioning errors similarity is proposed. Above on this, a method of robot accuracy compensation based on spatial interpolation is proposed. A KUKA robot is introduced to invalidate the proposed method, and the results show that by using the accuracy compensation method the maximum value of the robot positioning error is 0.386 mm, and the mean value is 0.156 mm, which are much more better than the previous values 1-3 mm, thus the method is feasible and effective.

  10. Expected Classification Accuracy using the Latent Distribution

    Directory of Open Access Journals (Sweden)

    Fanmin Guo

    2006-10-01

    Full Text Available Rudner (2001, 2005 proposed a method for evaluating classification accuracy in tests based on item response theory (IRT. In this paper, a latent distribution method is developed. For comparison, both methods are applied to a set of real data from a state test. While the latent distribution method relaxes several of the assumptions needed to apply Rudner's method, both approaches yield extremely comparable results. A simplified approach for applying Rudner's method and a short SPSS routine are presented.

  11. Influência do teor de Mo na microestrutura de ligas Fe-9Cr-xMo Effect of the content of molybdenum in the microstructure of Fe-9Cr-xMo alloy

    Directory of Open Access Journals (Sweden)

    Rodrigo Freitas Guimarães

    2010-12-01

    Full Text Available Aços Cr-Mo são usados na indústria do petróleo em aplicações com óleos crus ricos em compostos sulfurosos. Aços comerciais como 2.5Cr1Mo ou 9Cr1Mo têm se mostrado ineficientes em consequência de altos índices de corrosão naftênica. Uma estratégia para resolver este problema é o aumento do teor de molibdênio destes aços. Neste trabalho foi estudado o efeito do aumento do teor de molibdênio na microestrutura de ligas Fe-9Cr-xMo, solubilizadas e soldadas. Foram levantados os diagramas de fases com auxílio de um programa comercial para verificar as possíveis fases a serem formadas e identificar os problemas de soldagem. A microestrutura das ligas solubilizadas foi analisada por microscopia óptica e EBSD, além da medição da dureza. Foram realizadas soldagens autógenas para verificar o efeito do aporte térmico na microestrutura e na dureza das ligas. O aumento do teor de molibdênio resultou no aumento da dureza das ligas. A análise microestrutural das ligas soldadas apresentou uma particularidade para a liga com menor teor de molibdênio, a presença de martensita. Já as ligas com maior teor de molibdênio apresentaram uma microestrutura completamente ferrítica. A formação de martensita pode ser um problema na solda da liga com menor teor de molibdênio, uma vez que a mesma pode causar perdas nas propriedades mecânicas comprometendo sua aplicação.Cr-Mo steels are used in the petroleum industry in applications with crude oils rich in sulfur compounds. 2.5Cr1Mo or 9Cr1Mo do not resist to operating conditions when in contact with crude oils. The increasing of molybdenum content can improve the corrosion resistance of these alloys. This paper studied the effect of increased concentration of molybdenum in the microstructure of Fe-9Cr-xMo alloys, annealed and welded. Phase diagrams were built with the aid of commercial program to check the possible phases to be formed and to identify the problems of welding. Analyses were

  12. Forças de Corte Geradas por Torneamento um Estudo de Caso das Ligas Cu-Al-Be e Cu-Al-Be-Nb-Ni Passíveis do Efeito Memória de Forma

    OpenAIRE

    2014-01-01

    As ligas com memória de forma, mais especificamente as constituídas de CuAlBe, têm desempenhado um papel importante na fabricação de componentes eletromecânicos, sobretudo quando trabalhados a partir de solicitações térmicas e/ou tensões aplicadas. A princípio, neste presente trabalho de pesquisa, foram obtidas, por fundição a gás, amostras das ligas Cu-11,8%Al-0,60%Be; Cu-11,8%Al-0,55%Be; Cu-11,8%Al-0,55%Be-0,50%Nb-0,27%Ni (% em peso). Sequencialmente, temperou-se a metade delas, com o intui...

  13. Expected Classification Accuracy

    Directory of Open Access Journals (Sweden)

    Lawrence M. Rudner

    2005-08-01

    Full Text Available Every time we make a classification based on a test score, we should expect some number..of misclassifications. Some examinees whose true ability is within a score range will have..observed scores outside of that range. A procedure for providing a classification table of..true and expected scores is developed for polytomously scored items under item response..theory and applied to state assessment data. A simplified procedure for estimating the..table entries is also presented.

  14. Towards Understanding Spontaneous Speech Word Accuracy vs. Concept Accuracy

    CERN Document Server

    Boros, M; Gallwitz, F; Goerz, G; Hanrieder, G; Niemann, H

    1996-01-01

    In this paper we describe an approach to automatic evaluation of both the speech recognition and understanding capabilities of a spoken dialogue system for train time table information. We use word accuracy for recognition and concept accuracy for understanding performance judgement. Both measures are calculated by comparing these modules' output with a correct reference answer. We report evaluation results for a spontaneous speech corpus with about 10000 utterances. We observed a nearly linear relationship between word accuracy and concept accuracy.

  15. LIGA Technology and Its Application in Miniature Quadrupole Mass Spectrometer Array%LIGA技术及其在四级质谱计阵列微型化中的应用

    Institute of Scientific and Technical Information of China (English)

    丁军平; 周抗寒; 黄刚; 凌波; 刘学博

    2004-01-01

    The quadrupole mass spectrometer array (QMSA) is the most important embranchment in the miniaturization of the quadrupole mass spectrometer (QMS). Making miniature mass filter is one of the key technology in the manufacture of QMSA. In this paper, the method of LIGA technology and its application in making mass spectrometer are introduced. This resolve radically the question how to making a miniature QMS in volume, weight, power and cost.

  16. Accuracy of tablet splitting.

    Science.gov (United States)

    McDevitt, J T; Gurst, A H; Chen, Y

    1998-01-01

    We attempted to determine the accuracy of manually splitting hydrochlorothiazide tablets. Ninety-four healthy volunteers each split ten 25-mg hydrochlorothiazide tablets, which were then weighed using an analytical balance. Demographics, grip and pinch strength, digit circumference, and tablet-splitting experience were documented. Subjects were also surveyed regarding their willingness to pay a premium for commercially available, lower-dose tablets. Of 1752 manually split tablet portions, 41.3% deviated from ideal weight by more than 10% and 12.4% deviated by more than 20%. Gender, age, education, and tablet-splitting experience were not predictive of variability. Most subjects (96.8%) stated a preference for commercially produced, lower-dose tablets, and 77.2% were willing to pay more for them. For drugs with steep dose-response curves or narrow therapeutic windows, the differences we recorded could be clinically relevant.

  17. Relação entre toxicidade de proteínas Vip3Aa e sua capacidade de ligação a receptores intestinais de lepidópteros-praga

    Directory of Open Access Journals (Sweden)

    Suzana Cristina Marucci

    2015-08-01

    Full Text Available Resumo:O objetivo deste trabalho foi avaliar a toxicidade de novas proteínas Vip3Aa e sua capacidade de ligação a vesículas de membrana da microvilosidade apical (VMMA do intestino de lagartas neonatas de Spodoptera frugiperda, Anticarsia gemmatalise Heliothis virescens. Proteínas expressas pelos genes vip3Aa42 e vip3Aa43 mostraram-se tóxicas a S. frugiperda (CL50 de 78,2 e 113 ng cm-2, respectivamente e A. gemmatalis(CL50 de 239,2 e 57,5 ng cm-2, respectivamente, e pouco tóxicas a H. virescens (CL50>5.000 ng cm-2. Os ensaios de ligação às VMMA mostraram que as proteínas unem-se de forma efetiva aos receptores nas vesículas das espécies avaliadas, mas essa capacidade de ligação somente é efetiva na ativação da toxicidade para as populações avaliadas de S. frugiperdae A. gemmatalis.

  18. The value of spleen subpedicle two steps severance with LigaSure in laparoscopic splenectomy%二级脾蒂结扎速两步离断法在腹腔镜脾切除术中的应用

    Institute of Scientific and Technical Information of China (English)

    王广义; 刘亚辉; 吕国悦; 刘凯; 张威; 李楠; 谭毓铨

    2008-01-01

    目的 探讨腹腔镜脾切除术采用结扎速血管闭合系统(LigaSure)二级脾蒂两步离断法处理脾蒂及联合应用超声刀离断脾周韧带的安全性、有效性及经济性.方法 总结分析32例腹腔镜脾切除术应用LigaSure二级脾蒂两步离断法及联合超声刀离断脾周韧带的体会及治疗效果.其中男性4例,女性28例;年龄16~64岁,中位年龄36岁.脾脏长径11~23 cm,平均长径17 cm;特发性血小板减少性紫癜19例、遗传性球形红细胞增多症6例(其中同一家系5例)、溶血性贫血3例、脾外伤血肿感染2例、Evan综合征1例、白血病1例.术中采用LigaSure及超声刀相结合离断脾周韧带,当脾蒂处于充分游离的状态时,采取二级脾蒂LigaSure两步离断法切断脾蒂.第一步在胰尾侧用LigaSure先闭合脾蒂但不切断,第二步于脾侧用LigaSure闭合脾蒂并切断.结果 32例手术均获成功,其中4例家族性遗传性球形红细胞增多症患者同时联合腹腔镜胆囊切除术,无中转手术,平均手术时间70 min(55~130 min),术中平均出血200 ml(50~600 ml),无腹腔出血、无内脏损伤、无胰漏及腹腔感染等并发症,全部治愈出院,平均术后住院6 d.手术免除应用Endo-GIA,平均每例节省手术费用8050元(920~6900元).结论 腹腔镜脾切除术中应用LigaSure二级脾蒂两步离断法处理脾蒂及联合超声刀离断脾周韧带安全可靠,手术时间明显缩短,出血少,且可降低医疗费用,实现了低成本微创外科.%Objective To evaluate the safety and utility of the Methods of spleen subpedicle two steps severance with LigaSure Vessel Sealing System combined with ultrasound scalpel to resect perisplenic ligaments during laparoscopic splenectomy. Methods The Methods and the curative effect of 32 patients with laparoscopic splenectomy performed by the way as mentioned above were summarized and analyzed. 4 males,28 females,median 36 years(range 16-64 years). Mean

  19. Avaliação de Revestimentos de Liga de Níquel 625 Depositados pelo Processo Eletroescória

    Directory of Open Access Journals (Sweden)

    Soraia Simões Sandes

    Full Text Available Resumo A aplicação de revestimentos de ligas de níquel é comumente realizada na indústria de petróleo e gás para aumento da vida de equipamentos em ambientes agressivos, dado que este procedimento melhora a resistência à corrosão, sem um aumento significativo do custo de produção quando comparado com equipamentos maciços fabricados com outras ligas. Normalmente, as juntas são soldadas pelos processos de eletrodos revestidos, MIG/MAG ou TIG. Neste aspecto, o processo eletroescória realiza deposições com elevada energia de soldagem e baixa diluição, podendo ser uma opção interessante, uma vez que proporciona uma elevada produtividade, permitindo a soldagem com aplicação de apenas uma camada. O presente trabalho avalia propriedades mecânicas, microestruturais e de corrosão de revestimentos de liga de níquel 625 depositada em aço carbono ASTM A516 Grau 70 pelo processo eletroescória, tanto na condição como soldado quanto tratado termicamente. A deposição foi realizada com uma e duas camadas sobre chapas de dimensão 50x400x400 mm, na posição plana e energia de soldagem média de 11,7 kJ/mm. Após a soldagem realizou-se tratamento térmico a 620°C por 10 horas, sendo esta condição comparada ao estado de como soldado. Os ensaios de dobramento não indicaram evidências de defeitos. A avaliação microestrutural realizada por microscopia ótica (MO, eletrônica de varredura (MEV e eletrônica de transmissão (MET mostrou uma microestrutura austenítica para o depósito com pequena fração volumétrica de fases secundárias e o tratamento térmico de alívio de tensões não promoveu mudanças significativas nas propriedades. Na região de grãos grosseiros da zona termicamente afetada (RGGZTA foi observada a ocorrência de ferrita pró-eutetóide, perlita e bainita para o depósito com 1 camada e basicamente ferrita e perlita refinadas para o deposito com 2 passes devido às baixas taxas de resfriamento

  20. Check of the accuracy of the relativity theory with atmospheric muon neutrinos from the AMANDA data of the years 2000 to 2003; Ueberpruefung der Genauigkeit der Relativitaetstheorie mit atmosphaerischen Myonneutrinos aus den AMANDA-Daten der Jahre 2000 bis 2003

    Energy Technology Data Exchange (ETDEWEB)

    Ahrens, J.C.

    2006-11-08

    Atmospheric neutrinos allow one to test the principles of the Theory of Relativity in particular Lorentz invariance and the equivalence principle. Small deviations from these principles could lead, according to some theories, to detectable neutrino oscillations. Such oscillation effects are analysed in this thesis, using the data collected by the AMANDA detector. The neutrino telescope AMANDA is located at the South Pole and embedded in the Antarctic ice shield at a depth between 1500 m and 2000 m. AMANDA detects muon neutrinos via the Cherenkov light of neutrino induced muons allowing the reconstruction of the original neutrino direction. From the data of the years 2000 to 2003, which contain about seven billion recorded events and which mainly consist of the background of atmospheric muons, a sample of 3401 neutrino induced events has been selected. No indication for alternative oscillation effects has been found. For maximal mixing angles, a lower limit for parameters which violate Lorentz invariance or the equivalence principle could be set to {delta}{beta}(2 vertical stroke {phi} vertical stroke {delta}{gamma}){<=}5.15.10{sup -27}. (orig)

  1. Herança e ligação em locos de isoenzimas em Genipa americana L. Inheritance and linkage in isozymes loci of Genipa americana L.

    Directory of Open Access Journals (Sweden)

    Alexandre Magno SEBBENN

    2004-06-01

    Full Text Available A herança e a ligação foram estudadasem quatro locos polimórficos (6pghd-1, Pgi-2,Mdh-1 e Mdh-2 de três sistemas isoenzimáticos deGenipa americana, analisados por eletroforesehorizontal em gel de amido, usando tecidoscoletados de quinze progênies de polinização aberta,procedentes de Moji-Guaçu, Estado de São Paulo.Esses locos segregaram de dois a três alelos.A segregação nesses locos foi homogênea entreárvores. Contudo, existem desvios significativos dasegregação esperada 1:1 para algumas árvores emalguns locos. Desvios significativos da razão desegregação esperada 1:1 foram detectados noslocos Mdh-2 e 6pgdh-1. Não foram detectadasevidências de ligação entre nenhum dos pares delocos avaliados em G. americana e esses podemser utilizados sem restrição para estudos do sistemade reprodução, diversidade e estrutura genética depopulações da espécie.Inheritance and linkage for fourpolymorphic loci (6pghd-1, Pgi-2, Mdh-1 andMdh-2 from three enzyme systems in Genipaamericana were analyzed by horizontal starch gelelectrophoresis using tissues collected from fiftyopen-pollinated families in Moji-Guaçu, São PauloState. These allozyme loci have segregated fromtwo to four alleles per polymorphic locus. Genesegregation on those loci was homogeneous amongtrees. However, there were significant deviationsfrom the expected segregation ratios on some lociand some individual trees. In addition, Mdh-2 and6pgdh-1 loci have shown significant deviationsfrom the 1:1 expected segregation ratio. Linkagedisequilibrium evidences were not detected betweenany two pairs of loci from G. americana and thosecan be used with no restriction to study the matingsystem, genetic diversity, and genetic structure onthe species.

  2. A deficiência mental na concepção da liga brasileira de higiene mental Mental disability in the conception of brazilian league of mental hygiene

    Directory of Open Access Journals (Sweden)

    Milena Luckesi de Souza

    2008-08-01

    Full Text Available O objetivo deste texto é investigar a concepção e as propostas de atendimento escolar destinado aos deficientes mentais segundo o ideário higienista e eugenista difundido pela Liga Brasileira de Higiene Mental (LBHM. Para tanto, utilizamos como fonte primária de estudo os Arquivos Brasileiros de Higiene Mental (ABHM, periódico publicado entre 1925 e 1947. Verificamos que a LBHM expressa diferentes opiniões quanto à concepção e às medidas de intervenção propostas para os deficientes mentais. De um lado, propõe a higienização da população, a ser alcançada com a formação de hábitos sadios através da educação escolar e especificamente da educação higiênica, com a possível adaptação do deficiente ao meio social. De outro, defende uma posição eugênica radical, que apregoa a purificação da raça, a esterilização e exclusão dos ditos degenerados (leprosos, loucos, idiotas, epilépticos, cancerosos, nefrolíticos, tuberculosos, prostitutas, vagabundos e deficientes mentais.The aim of this study is to investigate the conception and proposals of schooling for individuals with mental disability according to the hygienic and eugenic ideology divulged by the Brazilian League for Mental Hygiene (Liga Brasileira de Higiene Mental, LBHM. To this end, we used as a primary source the Brazilian Archives of Mental Hygiene (Arquivos Brasileiros de Higiene Mental, ABHM, a newspaper published from 1925 to 1947. We concluded that there were various opinions in the LBHM about the conception and proposed intervention methods for individuals with mental disability. On one side, there were proposals of population cleansing to be achieved through healthy habits taught in schools, mainly hygienic education, with possible adaptation of the disabled individual to society. On the other hand, there was an extreme eugenic proposal that emphasized race purification, sterilization and exclusion of so-called degenerate individuals (lepers

  3. Reticence, Accuracy and Efficacy

    Science.gov (United States)

    Oreskes, N.; Lewandowsky, S.

    2015-12-01

    James Hansen has cautioned the scientific community against "reticence," by which he means a reluctance to speak in public about the threat of climate change. This may contribute to social inaction, with the result that society fails to respond appropriately to threats that are well understood scientifically. Against this, others have warned against the dangers of "crying wolf," suggesting that reticence protects scientific credibility. We argue that both these positions are missing an important point: that reticence is not only a matter of style but also of substance. In previous work, Bysse et al. (2013) showed that scientific projections of key indicators of climate change have been skewed towards the low end of actual events, suggesting a bias in scientific work. More recently, we have shown that scientific efforts to be responsive to contrarian challenges have led scientists to adopt the terminology of a "pause" or "hiatus" in climate warming, despite the lack of evidence to support such a conclusion (Lewandowsky et al., 2015a. 2015b). In the former case, scientific conservatism has led to under-estimation of climate related changes. In the latter case, the use of misleading terminology has perpetuated scientific misunderstanding and hindered effective communication. Scientific communication should embody two equally important goals: 1) accuracy in communicating scientific information and 2) efficacy in expressing what that information means. Scientists should strive to be neither conservative nor adventurous but to be accurate, and to communicate that accurate information effectively.

  4. Dialética do processo de trabalho da liga de hipertensão arterial Dialetic to the labour process in the hypertension league

    Directory of Open Access Journals (Sweden)

    Marcia Regina Car

    1996-08-01

    Full Text Available Buscou-se compreender o fenômeno da assistência à saúde desenvolvida na Liga de Diagnóstico e Tratamento da Hipertensão Arterial do Hospital das Clínicas da Faculdade de Medicina da USP,evidenciando suas contradições através da articulação dos elementos constitutivos deste processo de trabalho,contidos nos depoimentos de seus agentes. As concepções dos agentes sobre este processo de trabalho expressaram uma práxis reiterativa, consagrando e consolidando um dado saber específico que,para além de ser Meio da ação interventiva sobre o Objeto,configura-se num saber ideológico dominante na área de saúde.This study deals with the health assistance phenomena as it occurs in a hypertension league. The purpose of this research is to aprehend the contradictions, both internal and external, to the League labour process phenomena and, doing so, to enable the quest of alternative solutions to the quality assistance of transformation. The investigation reveals that the health workers conceptions about their labour process express a reiterative, non-creative and non-reflexive praxis. This way, it configures itself as a dominant and ideological one, beyond the fact of being an instrumental knowledge of intervention over the Object.

  5. The influence of screw type, alloy and cylinder position on the marginal fit of implant frameworks before and after laser welding Influência do tipo de parafuso, liga e da posição do cilindro na adaptação marginal das infra-estruturas sob implantes antes e após a soldagem a laser

    Directory of Open Access Journals (Sweden)

    Daniela Castilio

    2006-04-01

    Full Text Available Misfit at the abutment-prosthetic cylinder interface can cause loss of preload, leading to loosening or fracture of gold and titanium screws. OBJECTIVES: To evaluate the influence of screw type, alloy, and cylinder position on marginal fit of implant frameworks before and after laser welding. METHODS: After Estheticone-like abutments were screwed to the implants, thirty plastic prosthetic cylinders were mounted and waxed-up to fifteen cylindrical bars. Each specimen had three interconnected prosthetic components. Five specimens were one-piece cast in titanium and five in cobalt-chromium alloy. On each specimen, tests were conducted with hexagonal titanium and slotted gold screws separately, performing a total of thirty tested screws. Measurements at the interfaces were performed using an optical microscope with 5mm accuracy. After sectioning, specimens were laser welded and new measurements were obtained. Data were submitted to a four-way ANOVA and Tukey's multiple comparisons test (alpha=0.05. RESULTS: Slotted and hexagonal screws did not present significant differences regarding to the fit of cylinders cast in titanium, either in one-piece casting framework or after laser welding. When slotted and hexagonal screws were tested on the cobalt-chromium specimens, statistically significant differences were found for the one-piece casting condition, with the slotted screws presenting better fit (24.13µm than the hexagonal screws (27.93 µm. Besides, no statistically significant differences were found after laser welding. CONCLUSIONS: 1 The use of different metal alloys do exert influence on the marginal fit, 2 The slotted and hexagonal screws play the exclusive role of fixing the prosthesis, and did not improve the fit of cylinders, and 3 cylinder position did not affect marginal fit values.A desadaptação na interface abutment-cilindro protético pode causar perda da pré-carga, levando ao afrouxamento ou fratura dos parafusos de ouro e tit

  6. Determining Geometric Accuracy in Turning

    Institute of Scientific and Technical Information of China (English)

    Kwong; Chi; Kit; A; Geddam

    2002-01-01

    Mechanical components machined to high levels of ac cu racy are vital to achieve various functional requirements in engineering product s. In particular, the geometric accuracy of turned components play an important role in determining the form, fit and function of mechanical assembly requiremen ts. The geometric accuracy requirements of turned components are usually specifi ed in terms of roundness, straightness, cylindricity and concentricity. In pract ice, the accuracy specifications achievable are infl...

  7. Classification Accuracy Is Not Enough

    DEFF Research Database (Denmark)

    Sturm, Bob L.

    2013-01-01

    A recent review of the research literature evaluating music genre recognition (MGR) systems over the past two decades shows that most works (81\\%) measure the capacity of a system to recognize genre by its classification accuracy. We show here, by implementing and testing three categorically diff...... classification accuracy obscures the aim of MGR: to select labels indistinguishable from those a person would choose....

  8. Avaliação da fundibilidade de uma liga de cobalto-cromo Castability evaluation of a cobalt-chromium alloy

    Directory of Open Access Journals (Sweden)

    Adriana da Fonte Porto CARREIRO

    1999-04-01

    Full Text Available Neste trabalho propusemo-nos a avaliar a fundibilidade de uma liga de cobalto-cromo (VERA-PDI em função da utilização de três revestimentos: Knebel (aglutinado por sílica, Termocast e Wirovest (aglutinados por fosfato e duas temperaturas de aquecimento para o molde (900°C e 950°C. Para a execução do teste foi utilizado o método descrito por HINMAN et al.9 (1985. O método de fundição foi o de cera perdida sob chama de gás-oxigênio. Os dados obtidos foram submetidos a análise estatística e demonstraram não haver diferença estatisticamente significante para os revestimentos Knebel e Wirovest, e diferença estatisticamente significante ao nível de 0,1% para o revestimento Termocast quando da variação da temperatura de aquecimento do molde. Quando analisamos os revestimentos sob temperatura do molde de 900°C verificamos diferença estatisticamente significante entre Knebel e Termocast e Knebel e Wirovest ao nível de 0,1%, e diferença entre Termocast e Wirovest ao nível de 5%. Para a temperatura de 950°C houve diferença estatisticamente significante ao nível de 0,1% entre todos os revestimentos. Dentro dos parâmetros utilizados neste estudo pudemos concluir que, para a liga VERA-PDI, a utilização do revestimento Knebel e temperatura de aquecimento do molde de 950°C proporcionaram melhores resultados quanto à fundibilidade.The purpose of this study was to evaluate the castability of a cobalt-chromium alloy (Vera-PDI using three investments: Knebel (agglutinated by silica, Termocast and Wirovest (both agglutinated by phosphate at two molding temperatures (900°C and 950°C; using HINMAN et al.9 (1985; methodology. The casting method of using a wax and gas-oxygen flame was used. There was no significant statistical difference between the Knebel and Wirovest investments; however, there was a statistically significant difference for Termocast investment (P < 0.1 at the different temperatures. When analyzing the

  9. Uma comprovação químico-quântica sobre a formação de ligações de hidrogênio e interações secundárias em sistemas heterocíclicos intermoleculares

    Directory of Open Access Journals (Sweden)

    Boaz Galdino de Oliveira

    2009-07-01

    Full Text Available Original Abstract (in Portuguese: Realizamos um estudo teórico sobre a topologia da densidade de carga dos complexos C2H4O···C2H2 e C2H4S···C2H2. Através de cálculos da Teoria Quântica de Átomos em Moléculas (QTAIM – Quantum Theory of Atoms in Molecules, foi observada a formação de ligações de hidrogênio e interações secundárias nestes complexos. Tal análise foi executada mediante determinação das geometrias otimizadas destes complexos no nível de cálculo B3LYP/6-31G(d,p, pelo qual os operadores topológicos QTAIM foram computados, tais como a densidade eletrônica ρ(r, o Laplaciano Ñ2ρ(r, e a elipicidade ε. A caracterização das ligações de hidrogênio (O···H—C e (S···H—C foi feita baseada nos cálculos destes operadores, embora também tenha sido detectada a existência de uma interação secundária entre os átomos de hidrogênio axiais Hα e o carbono do acetileno. Nesta visão, esta interação secundária foi verificada apenas no complexo C2H4S···C2H2 devido ao fato de sua estrutura ser propícia a formar múltiplas interações.Abstract (in English: We have performed a detailed theoretical study in order to understand the charge density topology of the C2H4O•••C2H2 and C2H4S•••C2H2 heterocyclic hydrogen-bonded complexes. Through the calculations derived from Quantum Theory of Atoms in Molecules (QTAIM, it was observed the formation of hydrogen bonds and secondary interactions. Such analysis was performed through the determination of optimized geometries at B3LYP/6-31G(d,p level of theory, by which is that QTAIM topological operators were computed, such as the electronic density ?(r, Laplacian ?2?(r, and ellipticity e. The examination of the hydrogen bonds has been performed through the measurement of ?(r, ?2?(r and e between (O•••H—C and (S•••H—C, whereas the secondary interaction between axial hydrogen atoms Ha and carbon of acetylene. In this insight, it was

  10. ¿Tienen los árbitros de fútbol influencia en los resultados de la liga española?

    Directory of Open Access Journals (Sweden)

    Sala Garrido, Ramon

    2009-01-01

    Full Text Available RESUMEN El trabajo analiza los resultados de las temporadas 2002-03 a 2007-08 de la Liga Española de Primera División con el fin de determinar la influencia de los árbitros en los mismos, tanto desde el punto de vista del tiempo extra que añaden, como de las sanciones disciplinarias (faltas y tarjetas a los equipos. Se estudia también la influencia que sobre las decisiones del árbitro puede tener la afición del equipo local. Se concluye que no puede afirmarse que la exista influencia arbitral de forma generalizada, aunque algunos árbitros en concreto sí parecen influir en los resultados. El análisis permite también confirmar algo ya sabido, el escaso valor del tiempo extra para cambiar el resultado de un partido.ABSTRACT This paper analyses the results of the 2002-03 to 2007-08 seasons of the First Division Spanish Football League with the aim of determining the influence of referees in them, both from the point of view of the extra time they allow, as well as the disciplinary sanctions (fouls and cards given to the teams. The influence that the supporters of the local team may have over the referee’s decisions is also studied. The conclusion is that it is not possible to confirm the existence of referee influence in a general sense, although some specific referees do seem to have an influence on the results. This analysis also confirms something already known, which is the minimal value of extra time in changing the results of a match.

  11. Estudos da preparação de superfície da liga AA6063T5 e do desenvolvimento de revestimentos híbridos orgânico-inorgânicos a base de siloxano-PMMA para aplicação anticorrosiva

    OpenAIRE

    Teixeira, Dilton Gonçalves [UNESP

    2010-01-01

    Este trabalho está basicamente dividido em duas partes. A primeira está relacionada à limpeza da superfície da liga de alumínio AA6063T5 e sua influência na proteção contra a corrosão. A segunda parte se refere à preparação de revestimentos híbridos orgânicoinorgânico pelo processo sol-gel e deposição sobre a superfície da liga de alumínio por dipcoating. Três amostras de liga AA6063T5 foram investigadas: como recebida, debastada e polida mecanicamente e tratada quimicamente. O tratamento mec...

  12. Meditation Experience Predicts Introspective Accuracy

    Science.gov (United States)

    Fox, Kieran C. R.; Zakarauskas, Pierre; Dixon, Matt; Ellamil, Melissa; Thompson, Evan; Christoff, Kalina

    2012-01-01

    The accuracy of subjective reports, especially those involving introspection of one's own internal processes, remains unclear, and research has demonstrated large individual differences in introspective accuracy. It has been hypothesized that introspective accuracy may be heightened in persons who engage in meditation practices, due to the highly introspective nature of such practices. We undertook a preliminary exploration of this hypothesis, examining introspective accuracy in a cross-section of meditation practitioners (1–15,000 hrs experience). Introspective accuracy was assessed by comparing subjective reports of tactile sensitivity for each of 20 body regions during a ‘body-scanning’ meditation with averaged, objective measures of tactile sensitivity (mean size of body representation area in primary somatosensory cortex; two-point discrimination threshold) as reported in prior research. Expert meditators showed significantly better introspective accuracy than novices; overall meditation experience also significantly predicted individual introspective accuracy. These results suggest that long-term meditators provide more accurate introspective reports than novices. PMID:23049790

  13. CARACTERIZAÇÃO TECNOLÓGICA DA ESCÓRIA Fe-Cr BAIXO CARBONO E RECUPERAÇÃO DA LIGA METÁLICA POR MESA CONCENTRADORA

    Directory of Open Access Journals (Sweden)

    Aline Maria dos Santos Teixeira

    2015-10-01

    Full Text Available A escória Fe-Cr baixo carbono, é um dos principais resíduos advindos do processo metalúrgico para obtenção de liga de Fe-Cr. Este resíduo não possui aplicação e encontra-se acumulado em pátios, conforme regulamentação de órgãos ambientais. Este trabalho teve por finalidade caracterizar, sob os aspectos químicos e físicos, a escória Fe-Cr baixo carbono, pertencente à Companhia de Ferro e Ligas da Bahia S/A, FERBASA. Também foram realizados ensaios de concentração gravítica com a finalidade de remover a liga de Fe-Cr ainda residual na escória. As amostras da escória, após as etapas de preparação, foram submetidas aos ensaios de classificação granulométrica, FRX, lupa binocular e MEV-EDS. A análise dos resultados obtidos por lupa binocular indicou a existência, na escória, de grãos de quartzo, fragmento de rocha/minério e de fases metálicas e vítreas. As análises químicas revelaram teores de 30% de CaO, 15% de MgO e 12% de Cr2O3, com partículas metálicas contendo os elementos Fe e Cr associados. As investigações realizadas em mesas concentradoras possibilitaram a obtenção de um concentrado com aproximadamente 25% de Cr, sugerindo a reutilização do mesmo no processo siderúrgico de obtenção da liga de Fe-Cr.

  14. Análisis de los goles conseguidos en 13 temporadas (2000/01-2012/13 correspondientes a la Primera División de la Liga Española de Fútbol Profesional

    Directory of Open Access Journals (Sweden)

    J. Sánchez-Flores

    2016-06-01

    Conclusiones: La superioridad de los equipos más potentes parece clara, quizás excesiva, respecto al resto de equipos que participan en la principal liga española de fútbol. También se ha incrementado la probabilidad de que se consiga un número elevado de goles (> 5 goles en un partido. Esto provoca que la distribución del número de goles por partido sea del tipo binomial negativa.

  15. Metodologias para modelagem e análise da fadiga em ligações rebitadas com aplicação em pontes metálicas ferroviárias.

    OpenAIRE

    Ritermayer Monteiro Teixeira

    2015-01-01

    O processo de fadiga em pontes metálicas ferroviárias é um relevante problema de infraestrutura, largamente reconhecido como uma questão de segurança estrutural que precisa ser melhor compreendida. Apesar dos recentes avanços no campo da modelagem computacional, a aplicação de abordagens modernas para avaliação do comportamento à fadiga de ligações rebitadas típicas de pontes ainda é pouco explorada e impõe desafios. Nesse contexto, esta tese visa implementar metodologias de análise global-lo...

  16. Influence of stiffness in bolted connections in wooden plane structure of truss type Influência da rigidez de ligações parafusadas em estruturas planas de madeira do tipo treliça

    Directory of Open Access Journals (Sweden)

    André L. Christoforo

    2011-10-01

    Full Text Available Trusses are structural systems commonly used in projects, being employed mainly in roof structures, present in most rural buildings. The design of trusses, as well as other structural systems, requires the determination of displacements, strains and stresses. However, the project is developed from an ideal model of calculation, considering free rotation between the elements of a connection. This paper presents a computer program for the analysis of bidimensional wooden trusses with connections formed with two screws per node. The formulation is based on the flexibility method, taking into account the influence of the effect of semi-rigid connections formed by two screws. An example of a structure is presented and analyzed by the program developed here, highlighting the importance of behavior analysis on semi-rigid connections.Treliças são sistemas estruturais comumente utilizados em projetos, empregadas principalmente em estruturas de cobertura, presentes na maioria das construções rurais. O dimensionamento de treliças, assim como o de outros sistemas estruturais, requer a determinação dos deslocamentos, esforços, tensões e deformações atuantes em seus elementos constituintes. O cálculo é desenvolvido com base em um modelo ideal, considerando-se o giro livre entre os elementos componentes de uma ligação. Este trabalho objetiva apresentar um programa computacional destinado à análise de treliças planas de madeira com ligações formadas com dois parafusos por nó. A formulação é fundamentada no Método da Flexibilidade, levando-se em consideração a influência do efeito semirrígido das ligações formadas por dois parafusos. Um exemplo de estrutura auxiliar de cobertura é apresentado e analisado pelo programa desenvolvido, evidenciando-se a importância da análise do comportamento semirrígido sobre as ligações.

  17. Revestimientos a base de sílica e ácido fosfônico para proteção anticorrosiva da liga de alumínio AA2024-T3

    OpenAIRE

    Viviane Dalmoro

    2013-01-01

    A liga de alumínio AA2024-T3, extensivamente empregada na indústria aeronáutica, devido as microestruturas heterogêneas intencionalmente desenvolvidas para otimizar as propriedades mecânicas é susceptível a corrosão localizada. Com o intuito de prevenir a corrosão vários tratamentos de superfície têm sido investigados para substituir o tratamento de cromatização, e os filmes a base de sílica podem ser considerados como uma alternativa promissora. O objetivo deste trabalho é a obtenção, desenv...

  18. Estudo da densidade de ligações Cruzadas em géis superabsorventes obtidos do acetato de celulose Study of the crosslinking density in superabsorbent gels obtained from cellulose acetate

    Directory of Open Access Journals (Sweden)

    André M. Senna

    2013-01-01

    Full Text Available Neste trabalho foram realizadas sínteses de géis derivados de acetato de celulose (AC com grau de substituição (GS 2,5 por intermédio de reações de reticulação via esterificação. Os grupos hidroxílicos livres do AC foram reagidos com o dianidrido do ácido 1, 2, 4, 5 benzenotetracarboxílico (PMDA em meio homogêneo. As caracterizações foram realizadas por TGA (Análise termogravimétrica, espectroscopia na região do infravermelho (FTIR, retro titulação para determinar o grau de substituição do AC e microscopia de força atômica (AFM. Os géis foram sintetizados com as seguintes razões estequiométricas: [1:1], [1:2/3], [1:3] e [3:1] mol de PMDA/mol de OH livre respectivamente. A base da teoria de Flory-Rehner foi empregada para determinar ligações cruzadas nos géis. Os resultados de AFM mostram topografias distintas quando são comparados os géis entre si e quando os géis são comparados ao polímero de acetato de celulose. Este trabalho foi motivado pela importância tecnológica de polímeros de fontes renováveis como a celulose, em que um derivado de celulose foi usado para obter um polímero promissor para liberação controlada de medicamentos e adsorção de metais pesados em meio aquoso. Uma das vantagens deste polímero derivado do acetato de celulose é o emprego de poucas etapas na sua síntese.This work reports the synthesis of gels derived from cellulose acetate (CA with degree of substitution (DS 2.5 through esterification and crosslinking reactions. The free hydroxyl groups were reacted by using dianhydride of acid 1,2,4,5 benzenotetracarboxylic (PMDA as modifier in a homogeneous media. Characterization was performed with Thermogravimetric Analysis (TGA, Fourier Transform Infrared Spectroscopy (FTIR, retrotitration (known as back titration to determine the degree of substitution of AC and atomic force microscopy (AFM. The gels were synthesized with the following stoichiometric ratios: [1:1], [1:2/3], [1

  19. Recobrimento da liga Ti-6Al-4V com hidroxiapatita pelo método sol-gel e sua aplicação a hastes femorais não-cimentadas Coating of Ti-6Al-4V alloy with hydroxyapatite by using sol-gel method and its application to non-cemented femoral stem

    OpenAIRE

    Avés,E. P.; Galván, J. C.; I.R. Lima; Granjeiro, J.M.; Bastos, I. N.; Soares, G. D.

    2008-01-01

    O recobrimento de ligas metálicas com cerâmicas bioativas visa acelerar a formação óssea ao redor do implante, contribuindo para a sua estabilização. Neste trabalho estudou-se a fase cerâmica de hidroxiapatita depositada pelo processo sol-gel em chapas da liga metálica Ti-6Al-4V. A camada de recobrimento foi caracterizada por microscopia eletrônica de varredura, por difração de raios X e sua adesão ao substrato foi avaliada pelo teste de cisalhamento O teste de citocompatibilidade mostrou que...

  20. Process Analysis Via Accuracy Control

    Science.gov (United States)

    1982-02-01

    0 1 4 3 NDARDS THE NATIONAL February 1982 Process Analysis Via Accuracy Control RESEARCH PROG RAM U.S. DEPARTMENT OF TRANSPORTATION Maritime...SUBTITLE Process Analysis Via Accuracy Control 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e...examples are contained in Appendix C. Included, are examples of how “A/C” process - analysis leads to design improvement and how a change in sequence can

  1. Social Power Increases Interoceptive Accuracy

    Directory of Open Access Journals (Sweden)

    Mehrad Moeini-Jazani

    2017-08-01

    Full Text Available Building on recent psychological research showing that power increases self-focused attention, we propose that having power increases accuracy in perception of bodily signals, a phenomenon known as interoceptive accuracy. Consistent with our proposition, participants in a high-power experimental condition outperformed those in the control and low-power conditions in the Schandry heartbeat-detection task. We demonstrate that the effect of power on interoceptive accuracy is not explained by participants’ physiological arousal, affective state, or general intention for accuracy. Rather, consistent with our reasoning that experiencing power shifts attentional resources inward, we show that the effect of power on interoceptive accuracy is dependent on individuals’ chronic tendency to focus on their internal sensations. Moreover, we demonstrate that individuals’ chronic sense of power also predicts interoceptive accuracy similar to, and independent of, how their situationally induced feeling of power does. We therefore provide further support on the relation between power and enhanced perception of bodily signals. Our findings offer a novel perspective–a psychophysiological account–on how power might affect judgments and behavior. We highlight and discuss some of these intriguing possibilities for future research.

  2. A Nonparametric Approach to Estimate Classification Accuracy and Consistency

    Science.gov (United States)

    Lathrop, Quinn N.; Cheng, Ying

    2014-01-01

    When cut scores for classifications occur on the total score scale, popular methods for estimating classification accuracy (CA) and classification consistency (CC) require assumptions about a parametric form of the test scores or about a parametric response model, such as item response theory (IRT). This article develops an approach to estimate CA…

  3. Modeling Linkage Disequilibrium Increases Accuracy of Polygenic Risk Scores

    DEFF Research Database (Denmark)

    Vilhjálmsson, Bjarni J; Yang, Jian; Finucane, Hilary K

    2015-01-01

    to association statistics, but this discards information and can reduce predictive accuracy. We introduce LDpred, a method that infers the posterior mean effect size of each marker by using a prior on effect sizes and LD information from an external reference panel. Theory and simulations show that LDpred...

  4. Herança e desequilíbrio de ligação em sete locos isoenzimáticos de Cecropia pachystachya. Inheritance and linkage disequilibrium in sevem isozymes loci of Cecropia pachystachya.

    Directory of Open Access Journals (Sweden)

    Luciano Arruda RIBAS

    2004-12-01

    Full Text Available Seis sistemas enzimáticos (ACP,G6PDH, IDH, PGI, PGM e SKDH, codificandosete locos polimórficos (Acp-3, G6pdh-1, Idh-1,Pgi-2, Pgm-1, Pgm-2 e Skdh-1, foram investigadospara a herança e desequilíbrio de ligação emCecropia pachystachya Trec. A herança mendelianafoi confirmada para todos os locos avaliados.Desvios significativos da razão de segregaçãoesperada 1:1 foram detectados apenas em umaprogênies de árvore heterozigótica. O desequilíbriode ligação foi examinado para 21 pares de locosisoenzimáticos, não sendo detectados desequilíbriosentre nenhum deles e, assim, estes podem serutilizados em subseqüentes estudos do sistemade reprodução, diversidade e estrutura genética deC. pachystachya.

  5. Herança genética e desequilíbrio de ligação em locos de isoenzimas em Esenbeckia leiocarpa. Genetic inheritance and linkage disequilibrium in isozymes loci of Esenbeckia leiocarpa.

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Sícole SEOANE

    2004-06-01

    Full Text Available Oito sistemas enzimáticos (EST, IDH, PGM, PGI, MDH, PER, 6PGDH e SKDH codificando nove locos foram investigados em Esenbeckia leiocarpa. Quatro sistemas isoenzimáticos foram monomórficos (IDH, PGM, 6PGDH e SKDH e quatro polimórficos (EST, PGI, MDH e PER. A herança mendeliana foi confirmada para quatro locos, pelo teste de ajuste dos padrões de segregação observados em relação à razão de segregação esperada 1:1, em progênies de árvores heterozigotas. O desequilíbrio de ligação foi examinado para dez pares de locos. Apenas um simples par de locos parece estar em desequilíbrio de ligação, Est-1:Prx-1.Eight enzymes systems (EST, IDH, PGM, PGI, MDH, PER, 6PGDH and SKDH coding for nine loci were investigate in Esenbeckia leiocarpa. Four allozyme systems were monomorphic (IDH, PGM, 6PGDH and SKDH and four polymorphic (EST, PGI, MDH and PER. Mendelian inheritance was confirmed for four loci by testing the fit of band-pattern to 1:1 expected segregation ratio in progeny from heterozygous trees. Linkage disequilibrium was examined for ten pair of allozymes loci. A simple pair of loci appears to be in linkage disequilibrium, Est-1:Prx-1.

  6. Planejamento experimental no estudo eletroquímico de camadas de óxido de nióbio em liga de alumínio 3003

    Directory of Open Access Journals (Sweden)

    M. Tussolini

    2014-09-01

    Full Text Available A cromagem é uma opção que a indústria de metal mecânica tem encontrado para aumentar a resistência à corrosão de peças metálicas, porém esse revestimento apresenta a desvantagem de ser tóxico ao ser humano e ao meio ambiente. Para se alcançar um novo tratamento de superfície, pode-se aplicar planejamento experimental, a fim de otimizar os experimentos, principalmente quando há diversas variáveis para se chegar ao processo ou produto final. O objetivo principal deste trabalho é utilizar planejamento experimental para se obter um revestimento cerâmico à base de óxido de nióbio para ligas de alumínio 3003 e compará-lo ao revestimento de Cr (III, no mesmo substrato metálico. As técnicas empregadas foram polarização potenciodinâmica anódica, espectroscopia de impedância eletroquímica, microscopia eletrônica de varredura e mapeamento por espectroscopia de energia dispersiva. Utilizou-se um planejamento experimental 2³, no qual as variáveis foram velocidade de imersão, tempo de repouso após imersão e emersão na solução sol-gel à base de óxido de nióbio (razões molares n/n ácido cítrico/etilenoglicol 1:4, ácido e o complexo amoniacal de nióbio 10:1. Registrou-se uma tendência nas superfícies de respostas estudadas, sugerindo que em 5 min de imersão e emersão e na velocidade de 18 cm/min, o filme gerado apresenta uma maior resistência à corrosão. Os resultados de impedância eletroquímica e polarização potenciodinâmica anódica mostraram que o filme de óxido de nióbio apresenta maior resistência à corrosão que o revestimento utilizado industrialmente. Sendo assim, esse novo tratamento de superfície torna-se uma opção de substituição do revestimento a base de Cr (III.

  7. A meta-analysis comparing the outcomes of LigaSure Small Jaw versus clamp-and-tie technique or Harmonic Focus Scalpel in thyroidectomy

    Science.gov (United States)

    Zhang, Lei; Li, Namei; Yang, Xuemei; Chen, Jie

    2017-01-01

    Abstract Background: LigaSure (LS) Small Jaw is a surgical hemostasis equipment that is newly introduced in thyroid surgery. The objective of this study is to assess the short-term efficacy and safety outcomes of LS Small Jaw compared with clamp-and-tie technique or Harmonic Focus Scalpel in thyroidectomy. Methods: A literature search was performed in the PubMed and Embase databases (until June 12, 2016) that reported the comparisons between LS Small Jaw and other techniques in thyroidectomy. Quality assessments were performed according to The Cochrane Collaboration's risk of bias tool and a modification of the Newcastle-Ottawa Scale in randomized controlled trials (RCTs) and non-RCTs, respectively. All statistical analyses were conducted using RevMan 5.3. Results: Finally, 7 studies with 813 patients were included into the meta-analysis, and all included studies were comparable with moderate-to-high quality. There was significant reduced operative time in LS Small Jaw, compared with clamp-and-tie (mean difference [MD] = −17.49, 95% confidence interval [CI]: −22.20 to 12.77, P < 0.00001) or Harmonic Focus Scalpel (MD = −2.29, 95% CI: −3.19 to 1.39, P < 0.00001). Besides, other perioperative outcomes including intraoperative blood loss and postoperative blood loss favored LS Small Jaw compared with clamp-and-tie. In terms of complications, less-temporary hypocalcemia rate was observed in LS Small Jaw compared with clamp-and-tie (odds ratio [OR] = 0.49, 95% CI: 0.27–0.90, P = 0.02), although no significant difference was detected compared with Harmonic Focus Scalpel (OR = 0.47, 95% CI: 0.14–1.56, P = 0.22). Other complications such as length of hospital stay, permanent hypocalcemia, temporary or permanent recurrent laryngeal nerve palsy, and hematomas were not significant. Conclusion: In conclusion, LS Small Jaw is more favorable than clamp-and-tie technique or Harmonic Focus Scalpel in thyroidectomy. PMID:28296728

  8. Efficacy of a half-grip technique using a fine tip LigaSure™, Dolphin Tip Sealer/Divider, on liver dissection in swine model.

    Science.gov (United States)

    Toyama, Yoichi; Yoshida, Seiya; Saito, Ryota; Iwase, Ryota; Haruki, Koichiro; Okui, Norimitsu; Shimada, Jun-ichi; Kitamura, Hiroaki; Matsumoto, Michinori; Yanaga, Katsuhiko

    2015-08-20

    Recently, a lot of energy devices in the surgical field, especially in the liver surgery, have been developed, and a fine tip LigaSure™, Dolphin Tip Sealer/Divider (DT-SD) also has been used frequently to dissect liver parenchyma as well as ultrasonically activated device (USAD). However, the utility of this instrument for liver dissection (LD) is still unknown. Moreover, to reduce bleeding during LD, a half-grip technique (HGT) was contrived. We herein report an experimental study in swine model to evaluate the feasibility and effectiveness of HGT using DT-SD for LD. The swine model experiment was carried out under general anesthesia by veterinarians. LD was performed repeatedly by DT-SD with the HGT (Group A, n = 6), or the conventional clamp-crush technique (CCT) (Group B, n = 6), and by variable mode USAD (Group C, n = 6). The dissection length and depth (cm) as well as bleeding volume (g) were measured carefully, and the dissection area (cm(2)) and speed (cm(2)/min) were calculated precisely. Histological examinations of the dissection surfaces were also executed. Mann-Whitney's U test was used for Statistical analyses with variance at a significance level of 0.05. Among the three groups, the three averages of dissection lengths were unexpectedly equalized to 8.3 cm. The dissection area (cm(2)) was 9.9 ± 5.1 in Group A, 9.8 ± 4.7 in Group B, and 9.9 ± 4.5 in Group C. The mean blood loss during LD was 10.6 ± 14.8 g in Group A, 41.4 ± 39.2 g in Group B, and 34.3 ± 39.2 g in Group C. For Group A, the bleeding rate was the least, 0.9 ± 1.0 g/cm(2), and the average depth of coagulation was the thickest, 1.47 ± 0.29 mm, among the three groups (p dissection speed in Group A (1.3 ± 0.3 cm(2)/min) was slower, than that in Group C (p < 0.05). This report indicates firstly that the HGT using DT-SD bring the least blood loss when compared with CCT or USAD. Although the HGT is feasible and useful for LD, to popularize the HGT, further clinical studies will be

  9. Brasagem da zircônia metalizada com titânio à liga Ti-6Al-4V Brazing of metalized zirconia with titanium to Ti-6Al-4V alloy

    Directory of Open Access Journals (Sweden)

    J. S. Pimenta

    2012-06-01

    Full Text Available Zircônia tetragonal estabilizada com ítria foi mecanicamente metalizada com titânio e a condição de molhamento avaliada com as ligas convencionais Ag-28Cu e Au-18Ni. Estas dissolveram o revestimento de titânio para uma completa distribuição deste metal ativo na superfície cerâmica, gerando uma liga ativa in situ e possibilitando adequadas ligações químicas ao metal base na temperatura de união. Os melhores resultados de molhamento foram selecionados para brasagem indireta em forno de alto-vácuo nas juntas ZrO2/Ti-6Al-4V. Testes de detecção de vazamento de gás hélio foram realizados na interface de união das juntas; amostras removidas na seção transversal de juntas estanques foram examinadas por técnicas de análise microestrutural. Formou-se uma camada escura adjacente à cerâmica metalizada, responsável pelo molhamento ocasionado pela liga Ag-28Cu. Entretanto, o uso da liga Au-18Ni resultou em precipitação de intermetálicos e microtrincamento interfacial. Perfis de microdureza através da interface resultante até onde a zircônia mostrou típico escurecimento não indicaram alternância significativa entre medições consecutivas; os resultados dos ensaios de resistência mecânica à flexão-3p foram considerados satisfatórios.Yttria tetragonal zirconia polycrystal was mechanically metallized with titanium and the wetting behavior on the ceramic surface was analyzed using the conventional fillers Ag-28Cu and Au-18Ni. These alloys had dissolved the active metal coating, which acts to zirconia reduction on its surface and promoting suitable chemical bonding to the metallic member. Better wetting results were selected for indirect brazing in a high-vacuum furnace for ZrO2/Ti-6Al-4V simple butt joints. Helium gas leak detection was made at the joints interface; samples were removed from the tight joints cross-section and examined by microstructural analysis techniques and EDX analysis. There was formation of a dark

  10. Diagnostic accuracy in virtual dermatopathology

    DEFF Research Database (Denmark)

    Mooney, E.; Kempf, W.; Jemec, G.B.E.;

    2012-01-01

    Background Virtual microscopy is used for teaching medical students and residents and for in-training and certification examinations in the United States. However, no existing studies compare diagnostic accuracy using virtual slides and photomicrographs. The objective of this study was to compare...... slides and photomicrographs with corresponding clinical photographs and information in a self-assessment examination format. Descriptive data analysis and comparison of groups were performed using a chi-square test. Results Diagnostic accuracy in dermatopathology using virtual dermatopathology...... represented a useful tool for learning; 90% felt that virtual dermatopathology is useful tool for teaching dermatopathology. Conclusion No significant difference was observed in diagnostic accuracy using virtual dermatopathology compared to photomicrographs. Most participants felt virtual dermatopathology...

  11. Improving Speaking Accuracy through Awareness

    Science.gov (United States)

    Dormer, Jan Edwards

    2013-01-01

    Increased English learner accuracy can be achieved by leading students through six stages of awareness. The first three awareness stages build up students' motivation to improve, and the second three provide learners with crucial input for change. The final result is "sustained language awareness," resulting in ongoing…

  12. CADASTRAL DATABASE POSITIONAL ACCURACY IMPROVEMENT

    Directory of Open Access Journals (Sweden)

    N. M. Hashim

    2017-10-01

    Full Text Available Positional Accuracy Improvement (PAI is the refining process of the geometry feature in a geospatial dataset to improve its actual position. This actual position relates to the absolute position in specific coordinate system and the relation to the neighborhood features. With the growth of spatial based technology especially Geographical Information System (GIS and Global Navigation Satellite System (GNSS, the PAI campaign is inevitable especially to the legacy cadastral database. Integration of legacy dataset and higher accuracy dataset like GNSS observation is a potential solution for improving the legacy dataset. However, by merely integrating both datasets will lead to a distortion of the relative geometry. The improved dataset should be further treated to minimize inherent errors and fitting to the new accurate dataset. The main focus of this study is to describe a method of angular based Least Square Adjustment (LSA for PAI process of legacy dataset. The existing high accuracy dataset known as National Digital Cadastral Database (NDCDB is then used as bench mark to validate the results. It was found that the propose technique is highly possible for positional accuracy improvement of legacy spatial datasets.

  13. The hidden KPI registration accuracy.

    Science.gov (United States)

    Shorrosh, Paul

    2011-09-01

    Determining the registration accuracy rate is fundamental to improving revenue cycle key performance indicators. A registration quality assurance (QA) process allows errors to be corrected before bills are sent and helps registrars learn from their mistakes. Tools are available to help patient access staff who perform registration QA manually.

  14. Psychology Textbooks: Examining Their Accuracy

    Science.gov (United States)

    Steuer, Faye B.; Ham, K. Whitfield, II

    2008-01-01

    Sales figures and recollections of psychologists indicate textbooks play a central role in psychology students' education, yet instructors typically must select texts under time pressure and with incomplete information. Although selection aids are available, none adequately address the accuracy of texts. We describe a technique for sampling…

  15. Astronomic Position Accuracy Capability Study.

    Science.gov (United States)

    1979-10-01

    portion of F. E. Warren AFB, Wyoming. The three points were called THEODORE ECC , TRACY, and JIM and consisted of metal tribrachs plastered to cinder...sets were computed as a deviation from the standard. Accuracy figures were determined from these residuals. Homo - geneity of variances was tested using

  16. High accuracy flexural hinge development

    Science.gov (United States)

    Santos, I.; Ortiz de Zárate, I.; Migliorero, G.

    2005-07-01

    This document provides a synthesis of the technical results obtained in the frame of the HAFHA (High Accuracy Flexural Hinge Assembly) development performed by SENER (in charge of design, development, manufacturing and testing at component and mechanism levels) with EADS Astrium as subcontractor (in charge of doing an inventory of candidate applications among existing and emerging projects, establishing the requirements and perform system level testing) under ESA contract. The purpose of this project has been to develop a competitive technology for a flexural pivot, usuable in highly accurate and dynamic pointing/scanning mechanisms. Compared with other solutions (e.g. magnetic or ball bearing technologies) flexural hinges are the appropriate technology for guiding with accuracy a mobile payload over a limited angular ranges around one rotation axes.

  17. Interview accuracy in partial epilepsy.

    Science.gov (United States)

    Besocke, Ana Gabriela; Rojas, Juan Ignacio; Valiensi, Stella Maris; Cristiano, Edgardo; Garcia, María del Carmen

    2009-11-01

    The statistical concept of accuracy has never been applied to verify the history data collected on seizure disorders by open format interview. We compared patients'/witnesses' descriptions of epileptic seizures with videotaped seizure characteristics and analyzed the accuracy (ACC), sensitivity (SN), specificity (SP), false-positive rate (FPR), and false-negative rate (FNR) of various components of the semiology in patients with partial epilepsy. Language disturbances, complex automatisms, and autonomic signs have high ACC and intermediate FNRs. This means that these manifestations are most obvious to the witness/patient and, therefore, are memorized easily. Dystonic posturing and upper limb automatisms have the highest FNRs, leading to low ACC. These are very subtle signs, not vigorous enough to be paid attention to, but their predictive value in partial epilepsy syndromes is relatively high. We believe these signs need to be directly sought in the interview, because often the patient/witness pays limited attention to them.

  18. Kinematics Accuracy Analysis of Agricultural Automatic System End-effector Based on Screw Theory%基于旋量理论的农用自动化系统末端执行构件运动精度分析

    Institute of Scientific and Technical Information of China (English)

    程秀玲; 单水维

    2014-01-01

    In order to solve the problems of agricultural unit operation, low productivity and high labor costs and other, a class of agricultural automation system structure model was established, the main content of the end-effector motion control automation systems, simultaneous kinematics accuracy analysis of systems using screw theory end-effector, eventually the automatic system end-effector position and attitude error were got, which provide a basis for subsequent agricultural automation system control. The results show that screw theory use automated systems to establish a agricultural automation system end-effector motion errors mathematical model solves the error model can not reflect the actual movement of the system error problem;with the angle error increased, the end-effector error showed an increasing trend, and the trend is more obvious, and with the changes in body length error, the end-effector error did not change significantly.%为了解决农用装置机械臂作业过程中生产效率低与人力成本较高等问题,建立一类农业用自动化系统结构模型,将自动化系统末端执行构件运动控制作为主要研究内容,运用旋量理论对系统末端执行构件运动精度进行分析,最终得到自动化系统末端执行构件位置和姿态误差,为后续农业用自动化系统控制提供一定依据。研究结果表明,通过使用旋量理论得到一类农业用自动化系统末端执行构件的运动误差模型,解决了误差模型不能反映系统实际运动误差的问题;随角度误差增加末端执行构件误差呈现增加趋势,且趋势较为明显,而随长度误差变化末端执行构件误差变化并不明显。

  19. Analysing Interplanetary Probe Guidance Accuracy

    Directory of Open Access Journals (Sweden)

    S. V. Sukhova

    2016-01-01

    Full Text Available The paper presents a guidance accuracy analysis and estimates delta-v budget required to provide the trajectory correction maneuvers for direct interplanetary flights (without midcourse gravity assists. The analysis takes into consideration the orbital hyperbolic injection errors (depend on a selected launch vehicle and ascent trajectory and the uncertainties of midcourse correction maneuvers.The calculation algorithm is based on Monte Carlo simulation and Danby’s matrix methods (the matrizant of keplerian motion. Danby’s method establishes a link between the errors of the spacecraft state vectors at different flight times using the reference keplerian orbit matrizant. Utilizing the nominal trajectory parameters and the covariance matrix of launch vehicle injection errors the random perturbed orbits are generated and required velocity corrections are calculated. The next step is to simulate midcourse maneuver performance uncertainty using the midcourse maneuver covariance matrix. The obtained trajectory correction impulses and spacecraft position errors are statistically processed to compute required delta-v budget and dispersions ellipse parameters for different prediction intervals.As an example, a guidance accuracy analysis has been conducted for a 2022 mission to Mars and a Venus mission in 2026. The paper considers one and two midcourse correction options, as well as utilization of two different launch vehicles.The presented algorithm based on Monte Carlo simulation and Danby’s methods provides preliminary evaluation for midcourse corrections delta-v budget and spacecraft position error. The only data required for this guidance accuracy analysis are a reference keplerian trajectory and a covariance matrix of the injection errors. Danby’s matrix method allows us to take into account also the other factors affecting the trajectory thereby increasing the accuracy of analysis.

  20. Municipal water consumption forecast accuracy

    Science.gov (United States)

    Fullerton, Thomas M.; Molina, Angel L.

    2010-06-01

    Municipal water consumption planning is an active area of research because of infrastructure construction and maintenance costs, supply constraints, and water quality assurance. In spite of that, relatively few water forecast accuracy assessments have been completed to date, although some internal documentation may exist as part of the proprietary "grey literature." This study utilizes a data set of previously published municipal consumption forecasts to partially fill that gap in the empirical water economics literature. Previously published municipal water econometric forecasts for three public utilities are examined for predictive accuracy against two random walk benchmarks commonly used in regional analyses. Descriptive metrics used to quantify forecast accuracy include root-mean-square error and Theil inequality statistics. Formal statistical assessments are completed using four-pronged error differential regression F tests. Similar to studies for other metropolitan econometric forecasts in areas with similar demographic and labor market characteristics, model predictive performances for the municipal water aggregates in this effort are mixed for each of the municipalities included in the sample. Given the competitiveness of the benchmarks, analysts should employ care when utilizing econometric forecasts of municipal water consumption for planning purposes, comparing them to recent historical observations and trends to insure reliability. Comparative results using data from other markets, including regions facing differing labor and demographic conditions, would also be helpful.

  1. Waltz's Theory of Theory

    DEFF Research Database (Denmark)

    Wæver, Ole

    2009-01-01

    Kenneth N. Waltz's 1979 book, Theory of International Politics, is the most influential in the history of the discipline. It worked its effects to a large extent through raising the bar for what counted as theoretical work, in effect reshaping not only realism but rivals like liberalism and refle......Kenneth N. Waltz's 1979 book, Theory of International Politics, is the most influential in the history of the discipline. It worked its effects to a large extent through raising the bar for what counted as theoretical work, in effect reshaping not only realism but rivals like liberalism...... and reflectivism. Yet, ironically, there has been little attention to Waltz's very explicit and original arguments about the nature of theory. This article explores and explicates Waltz's theory of theory. Central attention is paid to his definition of theory as ‘a picture, mentally formed' and to the radical anti......-empiricism and anti-positivism of his position. Followers and critics alike have treated Waltzian neorealism as if it was at bottom a formal proposition about cause-effect relations. The extreme case of Waltz being so victorious in the discipline, and yet being consistently mis-interpreted on the question of theory...

  2. Relação entre toxicidade de proteínas Vip3Aa e sua capacidade de ligação a receptores intestinais de lepidópteros-praga

    OpenAIRE

    Suzana Cristina Marucci; Camila Soares Figueiredo; Renata Izabel Dozzi Tezza; Eliane Cristina da Cunha Alves; Manoel Victor Franco Lemos; Janete Apparecida Desidério

    2015-01-01

    Resumo:O objetivo deste trabalho foi avaliar a toxicidade de novas proteínas Vip3Aa e sua capacidade de ligação a vesículas de membrana da microvilosidade apical (VMMA) do intestino de lagartas neonatas de Spodoptera frugiperda, Anticarsia gemmatalise Heliothis virescens. Proteínas expressas pelos genes vip3Aa42 e vip3Aa43 mostraram-se tóxicas a S. frugiperda (CL50 de 78,2 e 113 ng cm-2, respectivamente) e A. gemmatalis(CL50 de 239,2 e 57,5 ng cm-2, respectivamente), e pouco tóxicas a H. vire...

  3. Comportamento crítico dinâmico de algoritmo de Wolff no Modelo de Ising com correlação de sítios e ligações.

    OpenAIRE

    Paulo Roberto de Araujo Campos

    1998-01-01

    Estudamos o comportamento dinâmico do algoritmo de Wolff no modelo de Ising diluído com correlação de sítios e ligações (modelo SBC). Nosso objetivo principal foi estudar a performance deste algoritmo em um sistema onde além da desordem à presença de impurezas não magnéticas, houvesse mais um parâmetro presente, a correlação espacial. Além disto foi possível obter o diagrama de fases para o modelo, o qual possibilita entendermos um pouco o efeito da desordem e da correlação no sistema.Verific...

  4. Resistencia a tração de agentes cimentantes usados na fixação de ligas de paladio-prata e niquel-cromo a dentina

    OpenAIRE

    2000-01-01

    Resumo: o propósito deste estudo foi avaliar a resistência à tração da união de dois tipos de ligas metálicas (Litecast B e Pors-on 4) fixadas em dentina humana tratada sob três condições (condicionada por 1O segundos com ácido fosfórico 35%, ácido poliacrílico 25% e não condicionada). Os cimentos foram 1- de fosfato de zinco, 2- ionômero d vidro e, 3- cimento resinoso. Noventa molares humanos foram inseridos em resina acrílica e desgastados com lixas d'água de granulação nOs 120, 320 e 600 a...

  5. Soldagem por atrito com pino não consumível de chapas finas do aço 1020 e da liga de alumínio 6063-T5

    OpenAIRE

    Edwar Andres Torres López

    2012-01-01

    Resumo: Neste trabalho foram realizadas juntas soldadas dissimilares de aço carbono AISI SAE 1020 e a liga de alumínio AA6063-T5, com 2 mm de espessura, empregando o processo de soldagem por atrito com pino não consumível (SAPNC). As juntas soldadas a topo foram realizadas empregando ferramenta de WC-14Co, com diâmetro de ombro e pino de 25,0 e 5,7 mm, respectivamente, e comprimento de pino de 1,35 mm. Foram empregadas velocidades de rotação e avanço de 300 RPM e 150 mm.min-1, respectivamente...

  6. Excitation Spectra of Nucleobases with Multiconfigurational Density Functional Theory

    DEFF Research Database (Denmark)

    Hubert, Mickaël; Jensen, Hans Jørgen Aa; Hedegård, Erik D.

    2016-01-01

    Range-separated hybrid methods between wave function theory and density functional theory (DFT) can provide high-accuracy results, while correcting some of the inherent flaws of both the underlying wave function theory and DFT. We here assess the accuracy for excitation energies of the nucleobases...

  7. Caracterização da liga comercial de alumínio 3003 produzida por fundição contínua de chapas (twin roll caster: microestrutura

    Directory of Open Access Journals (Sweden)

    Juliana de Paula Martins

    2006-12-01

    Full Text Available O presente trabalho caracterizou a microestrutura da liga comercial de alumínio 3003, produzida em escala industrial pelo processo de fundição contínua de chapas. Microscopia óptica com luz polarizada e campo escuro, microscopia eletrônica de varredura e ensaios de dureza Brinell foram utilizados. Os teores de manganês em solução sólida foram avaliados por medidas de resistividade elétrica. A análise química, ao longo da espessura da chapa é homogênea, ou seja, revela ausência de macro-segregação. A microestrutura da liga caracteriza-se pela presença de grãos com estrutura dendrítica, partículas primárias da fase Al6(Mn,Fe localizadas, preferencialmente, nos contornos de grão e a fração volumétrica de precipitados varia ao longo da espessura.The present work characterized the microstructure of a commercial 3003 aluminum alloy produced on an industrial scale by a twin roll caster process. Optical microscopy using polarized light and dark field, scanning electron microscopy, and Brinell hardness tests were carried out. The manganese content in solid solution was evaluated by electric resistivity measurements. The chemical composition across sheet thickness is homogeneous, in other words, there is no macro-segregation. A microstructural examination showed the presence of: grains with a dendritic structure, primary phase particles Al6(Mn,Fe in the grain boundaries, and variable volumetric fractions of the precipitated along the thickness.

  8. Age differences in the accuracy of confidence judgments.

    Science.gov (United States)

    Pliske, R M; Mutter, S A

    1996-01-01

    Age differences in accuracy were investigated by having older (M = 68.6 years) and younger (M = 21.5 years) adults make confidence judgments about the correctness of their responses to two sets of general knowledge items. For one set, prior to making their confidence judgments, subjects made mental strategy judgements indicating how they had selected their answers (i.e., they guessed, used intuition, made an inference, or immediately recognized the response as correct). Results indicate that older subjects were more accurate than younger subjects in predicting the correctness of their responses; however, making mental strategy judgments did not result in increased accuracy for either age group. Additional analyses explored the relationship between accuracy and other individual difference variables. The results of this investigation are consistent with recent theories of postformal cognitive development that suggest older adults have greater insight into the limitations of their knowledge.

  9. Error Model and Accuracy Calibration of 5-Axis Machine Tool

    Directory of Open Access Journals (Sweden)

    Fangyu Pan

    2013-08-01

    Full Text Available To improve the machining precision and reduce the geometric errors for 5-axis machinetool, error model and calibration are presented in this paper. Error model is realized by the theory of multi-body system and characteristic matrixes, which can establish the relationship between the cutting tool and the workpiece in theory. The accuracy calibration was difficult to achieve, but by a laser approach-laser interferometer and laser tracker, the errors can be displayed accurately which is benefit for later compensation.

  10. Improving accuracy of holes honing

    Directory of Open Access Journals (Sweden)

    Ivan М. Buykli

    2015-03-01

    Full Text Available Currently, in precision engineering industry tolerances for linear dimensions and tolerances on shape of surfaces of processing parts are steadily tightened These requirements are especially relevant in processing of holes. Aim of the research is to improve accuracy and to enhance the technological capabilities of holes honing process and, particularly, of blind holes honing. Based on formal logic the analysis of formation of processing errors is executed on the basis of consideration of schemes of irregularity of dimensional wear and tear along the length of the cutting elements. With this, the possibilities of compensating this irregularities and, accordingly, of control of accuracy of processing applied to the honing of both throughout and blind holes are specified. At the same time, a new method of honing is developed, it is protected by the patent of Ukraine for invention. The method can be implemented both on an existing machine tools at insignificant modernization of its system of processing cycle control and on newly designed ones.

  11. Knowledge discovery by accuracy maximization.

    Science.gov (United States)

    Cacciatore, Stefano; Luchinat, Claudio; Tenori, Leonardo

    2014-04-01

    Here we describe KODAMA (knowledge discovery by accuracy maximization), an unsupervised and semisupervised learning algorithm that performs feature extraction from noisy and high-dimensional data. Unlike other data mining methods, the peculiarity of KODAMA is that it is driven by an integrated procedure of cross-validation of the results. The discovery of a local manifold's topology is led by a classifier through a Monte Carlo procedure of maximization of cross-validated predictive accuracy. Briefly, our approach differs from previous methods in that it has an integrated procedure of validation of the results. In this way, the method ensures the highest robustness of the obtained solution. This robustness is demonstrated on experimental datasets of gene expression and metabolomics, where KODAMA compares favorably with other existing feature extraction methods. KODAMA is then applied to an astronomical dataset, revealing unexpected features. Interesting and not easily predictable features are also found in the analysis of the State of the Union speeches by American presidents: KODAMA reveals an abrupt linguistic transition sharply separating all post-Reagan from all pre-Reagan speeches. The transition occurs during Reagan's presidency and not from its beginning.

  12. The 100-meter dash: Theory and experiment

    Science.gov (United States)

    Wagner, Glenn

    1998-03-01

    This note outlines the theory regarding the position and velocity associated with the 100-m dash. The theory is applied to data produced by world-class sprinters as well as students with little formal training in sprinting. Inexpensive computer software is used to analyze the data to verify the outcome of these races so as to comment on the accuracy of the theory.

  13. Accuracy analysis and design of A3 parallel spindle head

    Science.gov (United States)

    Ni, Yanbing; Zhang, Biao; Sun, Yupeng; Zhang, Yuan

    2016-03-01

    As functional components of machine tools, parallel mechanisms are widely used in high efficiency machining of aviation components, and accuracy is one of the critical technical indexes. Lots of researchers have focused on the accuracy problem of parallel mechanisms, but in terms of controlling the errors and improving the accuracy in the stage of design and manufacturing, further efforts are required. Aiming at the accuracy design of a 3-DOF parallel spindle head(A3 head), its error model, sensitivity analysis and tolerance allocation are investigated. Based on the inverse kinematic analysis, the error model of A3 head is established by using the first-order perturbation theory and vector chain method. According to the mapping property of motion and constraint Jacobian matrix, the compensatable and uncompensatable error sources which affect the accuracy in the end-effector are separated. Furthermore, sensitivity analysis is performed on the uncompensatable error sources. The sensitivity probabilistic model is established and the global sensitivity index is proposed to analyze the influence of the uncompensatable error sources on the accuracy in the end-effector of the mechanism. The results show that orientation error sources have bigger effect on the accuracy in the end-effector. Based upon the sensitivity analysis results, the tolerance design is converted into the issue of nonlinearly constrained optimization with the manufacturing cost minimum being the optimization objective. By utilizing the genetic algorithm, the allocation of the tolerances on each component is finally determined. According to the tolerance allocation results, the tolerance ranges of ten kinds of geometric error sources are obtained. These research achievements can provide fundamental guidelines for component manufacturing and assembly of this kind of parallel mechanisms.

  14. Accuracy Analysis and Design of A3 Parallel Spindle Head

    Institute of Scientific and Technical Information of China (English)

    NI Yanbing; ZHANG Biao; SUN Yupeng; ZHANG Yuan

    2016-01-01

    As functional components of machine tools, parallel mechanisms are widely used in high efficiency machining of aviation components, and accuracy is one of the critical technical indexes. Lots of researchers have focused on the accuracy problem of parallel mechanisms, but in terms of controlling the errors and improving the accuracy in the stage of design and manufacturing, further efforts are required. Aiming at the accuracy design of a 3-DOF parallel spindle head(A3 head), its error model, sensitivity analysis and tolerance allocation are investigated. Based on the inverse kinematic analysis, the error model of A3 head is established by using the first-order perturbation theory and vector chain method. According to the mapping property of motion and constraint Jacobian matrix, the compensatable and uncompensatable error sources which affect the accuracy in the end-effector are separated. Furthermore, sensitivity analysis is performed on the uncompensatable error sources. The sensitivity probabilistic model is established and the global sensitivity index is proposed to analyze the influence of the uncompensatable error sources on the accuracy in the end-effector of the mechanism. The results show that orientation error sources have bigger effect on the accuracy in the end-effector. Based upon the sensitivity analysis results, the tolerance design is converted into the issue of nonlinearly constrained optimization with the manufacturing cost minimum being the optimization objective. By utilizing the genetic algorithm, the allocation of the tolerances on each component is finally determined. According to the tolerance allocation results, the tolerance ranges of ten kinds of geometric error sources are obtained. These research achievements can provide fundamental guidelines for component manufacturing and assembly of this kind of parallel mechanisms.

  15. d'plus: A program to calculate accuracy and bias measures from detection and discrimination data.

    Science.gov (United States)

    Macmillan, N A; Creelman, C D

    1997-01-01

    The program d'plus calculates accuracy (sensitivity) and response-bias parameters using Signal Detection Theory. Choice Theory, and 'nonparametric' models. is is appropriate for data from one-interval, two- and three-interval forced-choice, same different, ABX, and oddity experimental paradigms.

  16. Increasing Accuracy in Environmental Measurements

    Science.gov (United States)

    Jacksier, Tracey; Fernandes, Adelino; Matthew, Matt; Lehmann, Horst

    2016-04-01

    Human activity is increasing the concentrations of green house gases (GHG) in the atmosphere which results in temperature increases. High precision is a key requirement of atmospheric measurements to study the global carbon cycle and its effect on climate change. Natural air containing stable isotopes are used in GHG monitoring to calibrate analytical equipment. This presentation will examine the natural air and isotopic mixture preparation process, for both molecular and isotopic concentrations, for a range of components and delta values. The role of precisely characterized source material will be presented. Analysis of individual cylinders within multiple batches will be presented to demonstrate the ability to dynamically fill multiple cylinders containing identical compositions without isotopic fractionation. Additional emphasis will focus on the ability to adjust isotope ratios to more closely bracket sample types without the reliance on combusting naturally occurring materials, thereby improving analytical accuracy.

  17. Z Theory

    OpenAIRE

    Nekrasov, Nikita

    2004-01-01

    We present the evidence for the existence of the topological string analogue of M-theory, which we call Z-theory. The corners of Z-theory moduli space correspond to the Donaldson-Thomas theory, Kodaira-Spencer theory, Gromov-Witten theory, and Donaldson-Witten theory. We discuss the relations of Z-theory with Hitchin's gravities in six and seven dimensions, and make our own proposal, involving spinor generalization of Chern-Simons theory of three-forms. Based on the talk at Strings'04 in Paris.

  18. Prevalência do hiperaldosteronismo primário em uma liga de hipertensão arterial sistêmica Prevalencia del hiperaldosteronismo primario en una liga de hipertensión arterial sistémica Prevalence of primary hyperaldosteronism in a systemic arterial hypertension league

    Directory of Open Access Journals (Sweden)

    Maria Jacqueline Silva Ribeiro

    2009-01-01

    Full Text Available FUNDAMENTO: Até recentemente, o hiperaldosteronismo primário era considerado uma causa rara de hipertensão secundária. Porém, ao longo dos últimos anos, muitos estudos têm sugerido que essa doença pode afetar até 20% dos hipertensos. OBJETIVO: Determinar a prevalência do hiperaldosteronismo primário em pacientes hipertensos em tratamento na liga de hipertensão de um hospital universitário. MÉTODOS: Foram realizadas dosagens de aldosterona sérica e atividade plasmática da renina em 105 pacientes, em vigência do tratamento anti-hipertensivo usual, excetuando-se aqueles em uso de beta-bloqueadores e espironolactona, em jejum e após repouso na posição deitada por 20 minutos. Aqueles com relação aldosterona/atividade plasmática da renina maior que 25 foram submetidos ao teste de supressão com sobrecarga salina endovenosa e, após a confirmação da autonomia da secreção de aldosterona, foi realizada tomografia computadorizada das adrenais. Os resultados são apresentados como porcentagens, médias e desvios-padrão. RESULTADOS: Dos 105 pacientes, 6,54% eram hipertensos refratários. Nove apresentaram relação aldosterona/atividade plasmática da renina > 25 (8,5% do total. Destes, oito foram submetidos ao teste de supressão e um (hipertenso refratário teve o diagnóstico confirmado de hiperaldosteronismo primário (0,96% do total. Foi realizada tomografia computadorizada de adrenais, sendo considerada normal. CONCLUSÃO: A prevalência do hiperaldosteronismo primário na amostra estudada foi de 0,96% do total. No entanto, quando avaliados apenas os portadores de hipertensão refratária, a prevalência foi de 14,3%.FUNDAMENTO: Hasta recientemente, se consideraba el hiperaldosteronismo primario como una causa rara de hipertensión secundaria. Sin embargo, a lo largo de los últimos años, muchos estudios han sugerido que esa enfermedad puede afectar hasta el 20% de los hipertensos. OBJETIVO: Determinar la prevalencia del

  19. Data accuracy assessment using enterprise architecture

    Science.gov (United States)

    Närman, Per; Holm, Hannes; Johnson, Pontus; König, Johan; Chenine, Moustafa; Ekstedt, Mathias

    2011-02-01

    Errors in business processes result in poor data accuracy. This article proposes an architecture analysis method which utilises ArchiMate and the Probabilistic Relational Model formalism to model and analyse data accuracy. Since the resources available for architecture analysis are usually quite scarce, the method advocates interviews as the primary data collection technique. A case study demonstrates that the method yields correct data accuracy estimates and is more resource-efficient than a competing sampling-based data accuracy estimation method.

  20. Diagnostic accuracy of the care dependency scale

    NARCIS (Netherlands)

    Dijkstra, Ate; Tiesinga, LJ; Plantinga, L; Dassen, TWN; Veltman, G.

    2005-01-01

    Aim. This paper reports an investigation of the diagnostic accuracy of the Care Dependency Scale (CDS). Background. Assessment tools can be described in terms of diagnostic accuracy, or the ability to correctly classify subjects into clinically relevant subgroups. Diagnostic accuracy can be determin

  1. Alteração dimensional de amálgama de prata e liga à base de gálio Dimensional alteration of silver amalgam and gallium-based alloy

    Directory of Open Access Journals (Sweden)

    Rafael Yagüe BALLESTER

    2001-12-01

    Full Text Available As ligas de gálio surgiram como alternativa à problemática da toxicidade do mercúrio. Apresentam propriedades semelhantes às do amálgama, mas as pesquisas apontam duas características desfavoráveis: corrosão excessiva e grande magnitude de expansão de presa, podendo causar fraturas e rachaduras nas estruturas dentais. O objetivo foi avaliar in vitro a alteração dimensional durante 7 dias de uma liga de gálio (Galloy, SDI, Austrália, comparativamente com uma liga de amálgama contendo zinco (F-400, SDI, Austrália, em função do contato e/ou contaminação com solução salina (NaCl 0,9% nos estágios iniciais da cristalização. As condições experimentais de armazenagem foram em: ambiente seco; armazenagem em solução salina e contaminação com solução salina durante a condensação. Para o amálgama, foi ainda estudada a condição de contaminação introduzida na cápsula durante a trituração e para a liga de gálio, a proteção com resina fluida durante as primeiras 24 h ou durante todo o experimento. Os corpos-de-prova foram mantidos à temperatura de 37ºC ± 1ºC e suas dimensões monitoradas a cada 24 h, durante sete dias. O contato da liga de gálio com a solução salina durante a condensação ou nas primeiras horas após a condensação desencadeou uma expansão significantemente maior que as outras condições experimentais ao fim dos 7 dias. A aplicação de uma resina fluida para proteger a superfície dos cilindros foi capaz de evitar o aumento da expansão provocado pela umidade superficial. O amálgama não apresentou alterações significantes em nenhuma das condições experimentais, exceto quando contaminado durante a trituração.Gallium-based dental alloys were created with the aim of solving the problem of toxicity of mercury. The material shows mechanical properties similar to those of dental amalgam, but researches point out two unfavorable characteristics: great corrosion and excessive post

  2. ACCURACY OF CO2 SENSORS

    Energy Technology Data Exchange (ETDEWEB)

    Fisk, William J.; Faulkner, David; Sullivan, Douglas P.

    2008-10-01

    Are the carbon dioxide (CO2) sensors in your demand controlled ventilation systems sufficiently accurate? The data from these sensors are used to automatically modulate minimum rates of outdoor air ventilation. The goal is to keep ventilation rates at or above design requirements while adjusting the ventilation rate with changes in occupancy in order to save energy. Studies of energy savings from demand controlled ventilation and of the relationship of indoor CO2 concentrations with health and work performance provide a strong rationale for use of indoor CO2 data to control minimum ventilation rates1-7. However, this strategy will only be effective if, in practice, the CO2 sensors have a reasonable accuracy. The objective of this study was; therefore, to determine if CO2 sensor performance, in practice, is generally acceptable or problematic. This article provides a summary of study methods and findings ? additional details are available in a paper in the proceedings of the ASHRAE IAQ?2007 Conference8.

  3. Astrophysics with Microarcsecond Accuracy Astrometry

    Science.gov (United States)

    Unwin, Stephen C.

    2008-01-01

    Space-based astrometry promises to provide a powerful new tool for astrophysics. At a precision level of a few microarcsonds, a wide range of phenomena are opened up for study. In this paper we discuss the capabilities of the SIM Lite mission, the first space-based long-baseline optical interferometer, which will deliver parallaxes to 4 microarcsec. A companion paper in this volume will cover the development and operation of this instrument. At the level that SIM Lite will reach, better than 1 microarcsec in a single measurement, planets as small as one Earth can be detected around many dozen of the nearest stars. Not only can planet masses be definitely measured, but also the full orbital parameters determined, allowing study of system stability in multiple planet systems. This capability to survey our nearby stellar neighbors for terrestrial planets will be a unique contribution to our understanding of the local universe. SIM Lite will be able to tackle a wide range of interesting problems in stellar and Galactic astrophysics. By tracing the motions of stars in dwarf spheroidal galaxies orbiting our Milky Way, SIM Lite will probe the shape of the galactic potential history of the formation of the galaxy, and the nature of dark matter. Because it is flexibly scheduled, the instrument can dwell on faint targets, maintaining its full accuracy on objects as faint as V=19. This paper is a brief survey of the diverse problems in modern astrophysics that SIM Lite will be able to address.

  4. Continuous Glucose Monitoring and Trend Accuracy

    Science.gov (United States)

    Gottlieb, Rebecca; Le Compte, Aaron; Chase, J. Geoffrey

    2014-01-01

    Continuous glucose monitoring (CGM) devices are being increasingly used to monitor glycemia in people with diabetes. One advantage with CGM is the ability to monitor the trend of sensor glucose (SG) over time. However, there are few metrics available for assessing the trend accuracy of CGM devices. The aim of this study was to develop an easy to interpret tool for assessing trend accuracy of CGM data. SG data from CGM were compared to hourly blood glucose (BG) measurements and trend accuracy was quantified using the dot product. Trend accuracy results are displayed on the Trend Compass, which depicts trend accuracy as a function of BG. A trend performance table and Trend Index (TI) metric are also proposed. The Trend Compass was tested using simulated CGM data with varying levels of error and variability, as well as real clinical CGM data. The results show that the Trend Compass is an effective tool for differentiating good trend accuracy from poor trend accuracy, independent of glycemic variability. Furthermore, the real clinical data show that the Trend Compass assesses trend accuracy independent of point bias error. Finally, the importance of assessing trend accuracy as a function of BG level is highlighted in a case example of low and falling BG data, with corresponding rising SG data. This study developed a simple to use tool for quantifying trend accuracy. The resulting trend accuracy is easily interpreted on the Trend Compass plot, and if required, performance table and TI metric. PMID:24876437

  5. Boccia: Factor de integración social y su significado en mujeres y hombres adscritos a la liga de parálisis cerebral de Bogotá

    Directory of Open Access Journals (Sweden)

    Karim Alvis

    2013-04-01

    Full Text Available Antecedentes. El Boccia es un deporte que debido a sus características técnicas y metodológicas y a que es mixto, de precisión y estrategia, permite la participación de individuos con diversos tipos de limitaciones físicas, permitiendo de esta forma la integración social de los mismos, en un contexto de equidad, por lo cual ha tenido una gran acogida a nivel mundial siendo catalogado como el deporte bandera de la Asociación Internacional de Deportes y Recreación para personas con Parálisis Cerebral (CP-ISRA. Objetivo. Explorar los posibles significados que para mujeres y hombres en situación de discapacidad, tiene la práctica del Boccia como factor de integración social. Método. Esta investigación optó por el enfoque Cualitativo etnográfico, a través de las narrativas y experiencias de los protagonistas en este caso mujeres y hombres que hacen parte de la liga de Parálisis Cerebral de Bogotá- Boccia. Para estos efectos se utilizaron instrumentos como las entrevistas semiestructuradas, grupos focales y narrativas visuales. Resultados. El documento presenta un análisis de la percepción y los alcances de la práctica de un deporte como el Boccia en la integración social de los individuos desde las categorías de los conceptos de solidaridad, autonomía, reconocimiento de la diversidad, participación, universalidad, equidad, corresponsabilidad, efectividad, poder, libertad e identidad. Conclusión. Se concluye que los significados otorgados al Boccia como factor de integración social, por parte de los participantes en la Liga, en general se enmarcan de manera positiva en las categorías conceptuales propuestas para su análisis. Sin embargo, existe aún un alto desconocimiento de la discapacidad y de aceptación de las diferencias que se convierte en un factor limitante para una adecuada integración social.

  6. String theory

    OpenAIRE

    Marino Beiras, Marcos

    2001-01-01

    We give an overview of the relations between matrix models and string theory, focusing on topological string theory and the Dijkgraaf--Vafa correspondence. We discuss applications of this correspondence and its generalizations to supersymmetric gauge theory, enumerative geometry and mirror symmetry. We also present a brief overview of matrix quantum mechanical models in superstring theory.

  7. Game Theory

    DEFF Research Database (Denmark)

    Game Theory is a collection of short interviews based on 5 questions presented to some of the most influential and prominent scholars in game theory. We hear their views on game theory, its aim, scope, use, the future direction of game theory and how their work fits in these respects....

  8. The rereading effect: metacomprehension accuracy improves across reading trials.

    Science.gov (United States)

    Rawson, K A; Dunlosky, J; Thiede, K W

    2000-09-01

    Guided by a hypothesis that integrates principles of monitoring from a cue-based framework of metacognitive judgments with assumptions about levels of text representation derived from theories of comprehension, we discovered that rereading improves metacomprehension accuracy. In Experiments 1 and 2, the participants read texts either once or twice, rated their comprehension for each text, and then were tested on the material. In both experiments, correlations between comprehension ratings and test scores were reliably greater for participants who reread texts than for participants who read texts only once. Furthermore, in contrast to the low levels of accuracy typically reported in the literature, rereading produced relatively high levels of accuracy, with the median gamma between ratings and test performance being +.60 across participants from both experiments. Our discussion focuses on two alternative hypotheses--that improved accuracy is an artifact of when judgments are collected or that it results from increased reliability of test performance--and on evidence that is inconsistent with these explanations for the rereading effect.

  9. Accuracy analysis of simplified and rigorous numerical methods applied to binary nanopatterning gratings in non-paraxial domain

    Science.gov (United States)

    Francés, Jorge; Bleda, Sergio; Gallego, Sergi; Neipp, Cristian; Márquez, Andrés; Pascual, Inmaculada; Beléndez, Augusto

    2013-11-01

    A set of simplified and rigorous electromagnetic vector theories is used for analyzing the transmittance characteristics of diffraction phase gratings. The scalar diffraction theory and the effective medium theory are validated with the exact results obtained via the rigorous coupled-wave theory and the finite-difference time-domain method. The effects of surface profile parameters and also the angle of incidence is demonstrated to be a limiting factor in the accuracy of these theories. Therefore, the error of both simplified theories is also analyzed in non-paraxial domain with the intention of establishing a specific range of validity for both simplified theories.

  10. Density functional theory: Fixing Jacob's ladder

    Science.gov (United States)

    Car, Roberto

    2016-09-01

    Density functional theory calculations can be carried out with different levels of accuracy, forming a hierarchy that is often represented by the rungs of a ladder. Now a new method has been developed that significantly improves the accuracy of the 'third rung' when calculating the properties of diversely bonded systems.

  11. Classical Electromagnetic Theory

    CERN Document Server

    VanderLinde, Jack

    2004-01-01

    This book is a self contained course in electromagnetic theory suitable for senior physics and electrical engineering students as well as graduate students whose past has not prepared them well for books such as Jackson or Landau and Lifschitz. The text is liberally sprinkled with worked examples illustrating the application of the theory to various physical problems. In this new edition I have endeavored to improve the accuracy and readability, added and further clarified examples, added sections on Schwarz-Christoffel mappings, and to make the book more self sufficient added an appendix on orthogonal function expansions and added the derivation of Bessel functions and Legendre polynomials as well as derivation of their generating functions. The number of student exercises has been increased by 45 over the previous edition. This book stresses the unity of electromagnetic theory with electric and magnetic fields developed in parallel. SI units are used throughout and considerable use is made of tensor notatio...

  12. Optimal Calibration Accuracy for Gravitational Wave Detectors

    CERN Document Server

    Lindblom, Lee

    2009-01-01

    Calibration errors in the response function of a gravitational wave detector degrade its ability to detect and then to measure the properties of any detected signals. This paper derives the needed levels of calibration accuracy for each of these data-analysis tasks. The levels derived here are optimal in the sense that lower accuracy would result in missed detections and/or a loss of measurement precision, while higher accuracy would be made irrelevant by the intrinsic noise level of the detector. Calibration errors affect the data-analysis process in much the same way as errors in theoretical waveform templates. The optimal level of calibration accuracy is expressed therefore as a joint limit on modeling and calibration errors: increased accuracy in one reduces the accuracy requirement in the other.

  13. Accuracy property of certain hyperbolic difference schemes

    Energy Technology Data Exchange (ETDEWEB)

    Hicks, D.L.; Madsen, M.M.

    1976-12-01

    An accuracy property called the CFL1 property is shared by several successful difference schemes. It appears to be a property at least as important as the property of higher-order accuracy for hyperbolic difference schemes when weak solutions (e.g., shocks) are sought. Investigation of this property leads to suggestions of ways to improve the accuracy in such wavecodes as WONDY, CHARTD, and THREEDY. 10 figures.

  14. Dualities in M-theory and Born-Infeld Theory

    Energy Technology Data Exchange (ETDEWEB)

    Brace, Daniel M. [Univ. of California, Berkeley, CA (United States)

    2001-01-01

    We discuss two examples of duality. The first arises in the context of toroidal compactification of the discrete light cone quantization of M-theory. In the presence of nontrivial moduli coming from the M-theory three form, it has been conjectured that the system is described by supersymmetric Yang-Mills gauge theory on a noncommutative torus. We are able to provide evidence for this conjecture, by showing that the dualities of this M-theory compactification, which correspond to T-duality in Type IIA string theory, are also dualities of the noncommutative supersymmetric Yang-Mills description. One can also consider this as evidence for the accuracy of the Matrix Theory description of M-theory in this background. The second type of duality is the self-duality of theories with U(1) gauge fields. After discussing the general theory of duality invariance for theories with complex gauge fields, we are able to find a generalization of the well known U(1) Born-Infeld theory that contains any number of gauge fields and which is invariant under the maximal duality group. We then find a supersymmetric extension of our results, and also show that our results can be extended to find Born-Infeld type actions in any even dimensional spacetime.

  15. Dualities in M-theory and Born-Infeld Theory

    Energy Technology Data Exchange (ETDEWEB)

    Brace, Daniel, M

    2001-08-01

    We discuss two examples of duality. The first arises in the context of toroidal compactification of the discrete light cone quantization of M-theory. In the presence of nontrivial moduli coming from the M-theory three form, it has been conjectured that the system is described by supersymmetric Yang-Mills gauge theory on a noncommutative torus. We are able to provide evidence for this conjecture, by showing that the dualities of this M-theory compactification, which correspond to T-duality in Type IIA string theory, are also dualities of the noncommutative supersymmetric Yang-Mills description. One can also consider this as evidence for the accuracy of the Matrix Theory description of M-theory in this background. The second type of duality is the self-duality of theories with U(1) gauge fields. After discussing the general theory of duality invariance for theories with complex gauge fields, we are able to find a generalization of the well known U(1) Born-Infeld theory that contains any number of gauge fields and which is invariant under the maximal duality group. We then find a supersymmetric extension of our results, and also show that our results can be extended to find Born-Infeld type actions in any even dimensional spacetime.

  16. Load-induced error identification of hydrostatic turntable and its influence on machining accuracy

    Institute of Scientific and Technical Information of China (English)

    程强; 任伟达; 刘志峰; 陈东菊; 顾佩华

    2016-01-01

    In heavy duty machine tools, hydrostatic turntable is often used as a means for providing rotational motion and supporting workpiece, so the accuracy of turntable is crucial for part machining. In order to analyze the influence of load-indcued errors on machining accuracy, an identification model of load-induced errors based on the deformation caused by applied load of hydrostatic turntable of computerized numerical control (CNC) gantry milling heavy machine is proposed. Based on multi-body system theory and screw theory, the space machining accuracy model of heavy duty machine tool is established with consideration of identified load-induced errors. And then, the influence of load-induced errors on space machining accuracy and the roundness error of a milled hole is analyzed. The analysis results show that load-induced errors have a big influence on the roundness error of machined hole, especially when the center of the milled hole is far from that of hydrostatic turntable.

  17. Uma observação sobre o lugar da teoria da ligação e do critério temático dentro do programa minimalista

    Directory of Open Access Journals (Sweden)

    FERREIRA Marcelo Barra

    2000-01-01

    Full Text Available Neste artigo, apresento evidências que levam à conclusão de que o lugar da Teoria da Ligação (TL no Programa Minimalista (Chomsky 1993; 1995 é depois de FL (Forma Lógica. Mostro que derivações conduzindo a estruturas que contêm violações dos princípios da TL convergem em FL, já que derivações alternativas menos econômicas que respeitam tais princípios também são agramaticais. Sendo irrelevante para a noção de convergência, a TL tem de se aplicar depois de FL. Um raciocínio semelhante revela que o Critério Temático tem o estatuto de um condição de interface se aplicando em FL, uma vez que derivações menos econômicas são permitidas pelo sistema computacional para evitar violações relacionadas a ele.

  18. Sujeitos do crime e da notícia: casos PCC e Liga da Justiça e as apropriações da arena midiática contemporânea

    Directory of Open Access Journals (Sweden)

    Flora Daemon

    2010-12-01

    Full Text Available Propomos investigar os gestos de apropriação da arena midiática por sujeitos criminosos como emergência do fenômeno de midiatização da sociedade contemporânea. Mais do que autores de trajetórias delinquentes, estes se engajam na produção de relatos sobre si numa campanha midiatizada, cujo objetivo principal é a disputa pelo controle das construções simbólicas a seu respeito. Ao se deslocarem do lugar de receptores de conteúdos informativos, rompem a fronteira da audiência e tornam-se produtores de relatos midiáticos como instrumento de disputa por espaços de produção e transmissão dos relatos midiáticos. Para tanto, elegemos dois eventos emblemáticos – o sequestro do jornalista Guilherme Portanova pelo PCC e a publicação dos vídeos com “entrevistas-defesa” pelo chefe da milícia carioca Liga da Justiça –, para iniciarmos a reflexão a respeito dos efeitos da midiatização também sobre sujeitos

  19. Flush-mounted hot film anemometer accuracy in pulsatile flow.

    Science.gov (United States)

    Nandy, S; Tarbell, J M

    1986-08-01

    The accuracy of a flush-mounted hot film anemometer probe for wall shear stress measurements in physiological pulsatile flows was evaluated in fully developed pulsatile flow in a rigid straight tube. Measured wall shear stress waveform based on steady flow anemometer probe calibrations were compared to theoretical wall shear stress waveforms based on well-established theory and measured flow rate waveforms. The measured and theoretical waveforms were in close agreement during systole (average deviation of 14 percent at peak systole). As expected, agreement was poor during diastole because of flow reversal and diminished frequency response at low shear rate.

  20. Topos theory

    CERN Document Server

    Johnstone, PT

    2014-01-01

    Focusing on topos theory's integration of geometric and logical ideas into the foundations of mathematics and theoretical computer science, this volume explores internal category theory, topologies and sheaves, geometric morphisms, other subjects. 1977 edition.

  1. Improving Accuracy in a Clinical Judgmental Task

    Science.gov (United States)

    Strasburger, Erich L.; Jackson, Douglas N.

    1977-01-01

    This study was designed to identify kinds of information leading to increased accuracy of clinical judgments. Results confirm the feasibility of increasing accuracy in meaningful clinical judgment tasks through practice and of studying clinical judgment by using construct-oriented personality scales to which targets bear a substantive…

  2. Accuracy of Parent Identification of Stuttering Occurrence

    Science.gov (United States)

    Einarsdottir, Johanna; Ingham, Roger

    2009-01-01

    Background: Clinicians rely on parents to provide information regarding the onset and development of stuttering in their own children. The accuracy and reliability of their judgments of stuttering is therefore important and is not well researched. Aim: To investigate the accuracy of parent judgements of stuttering in their own children's speech…

  3. Accuracy of Parent Identification of Stuttering Occurrence

    Science.gov (United States)

    Einarsdottir, Johanna; Ingham, Roger

    2009-01-01

    Background: Clinicians rely on parents to provide information regarding the onset and development of stuttering in their own children. The accuracy and reliability of their judgments of stuttering is therefore important and is not well researched. Aim: To investigate the accuracy of parent judgements of stuttering in their own children's speech…

  4. Quality of reporting of diagnostic accuracy studies

    NARCIS (Netherlands)

    Smidt, N.; Rutjes, A.W.; Windt - Mens, van der D.A.W.M.; Ostelo, R.W.J.G.; Reitsma, J.B.; Bouter, L.M.; Vet, de H.C.W.

    2005-01-01

    PURPOSE: To evaluate quality of reporting in diagnostic accuracy articles published in 2000 in journals with impact factor of at least 4 by using items of Standards for Reporting of Diagnostic Accuracy (STARD) statement published later in 2003. MATERIALS AND METHODS: English-language articles on pri

  5. Quality of reporting of diagnostic accuracy studies

    NARCIS (Netherlands)

    Smidt, N.; Rutjes, A.W.; Windt - Mens, van der D.A.W.M.; Ostelo, R.W.J.G.; Reitsma, J.B.; Bouter, L.M.; Vet, de H.C.W.

    2005-01-01

    PURPOSE: To evaluate quality of reporting in diagnostic accuracy articles published in 2000 in journals with impact factor of at least 4 by using items of Standards for Reporting of Diagnostic Accuracy (STARD) statement published later in 2003. MATERIALS AND METHODS: English-language articles on pri

  6. Packaging Theory.

    Science.gov (United States)

    Williams, Jeffrey

    1994-01-01

    Considers the recent flood of anthologies of literary criticism and theory as exemplifications of the confluence of pedagogical concerns, economics of publishing, and other historical factors. Looks specifically at how these anthologies present theory. Cites problems with their formatting theory and proposes alternative ways of organizing theory…

  7. Agency Theory

    DEFF Research Database (Denmark)

    Linder, Stefan; Foss, Nicolai Juul

    Agency theory studies the problems and solutions linked to delegation of tasks from principals to agents in the context of conflicting interests between the parties. Beginning from clear assumptions about rationality, contracting and informational conditions, the theory addresses problems of ex...... agency theory to enjoy considerable scientific impact on social science; however, it has also attracted considerable criticism....

  8. Sampling Molecular Conformers in Solution with Quantum Mechanical Accuracy at a Nearly Molecular-Mechanics Cost.

    Science.gov (United States)

    Rosa, Marta; Micciarelli, Marco; Laio, Alessandro; Baroni, Stefano

    2016-09-13

    We introduce a method to evaluate the relative populations of different conformers of molecular species in solution, aiming at quantum mechanical accuracy, while keeping the computational cost at a nearly molecular-mechanics level. This goal is achieved by combining long classical molecular-dynamics simulations to sample the free-energy landscape of the system, advanced clustering techniques to identify the most relevant conformers, and thermodynamic perturbation theory to correct the resulting populations, using quantum-mechanical energies from density functional theory. A quantitative criterion for assessing the accuracy thus achieved is proposed. The resulting methodology is demonstrated in the specific case of cyanin (cyanidin-3-glucoside) in water solution.

  9. Atomic theories

    CERN Document Server

    Loring, FH

    2014-01-01

    Summarising the most novel facts and theories which were coming into prominence at the time, particularly those which had not yet been incorporated into standard textbooks, this important work was first published in 1921. The subjects treated cover a wide range of research that was being conducted into the atom, and include Quantum Theory, the Bohr Theory, the Sommerfield extension of Bohr's work, the Octet Theory and Isotopes, as well as Ionisation Potentials and Solar Phenomena. Because much of the material of Atomic Theories lies on the boundary between experimentally verified fact and spec

  10. Agency Theory

    DEFF Research Database (Denmark)

    Linder, Stefan; Foss, Nicolai Juul

    2015-01-01

    Agency theory studies the problems and solutions linked to delegation of tasks from principals to agents in the context of conflicting interests between the parties. Beginning from clear assumptions about rationality, contracting, and informational conditions, the theory addresses problems of ex ...... agency theory to enjoy considerable scientific impact on social science; however, it has also attracted considerable criticism.......Agency theory studies the problems and solutions linked to delegation of tasks from principals to agents in the context of conflicting interests between the parties. Beginning from clear assumptions about rationality, contracting, and informational conditions, the theory addresses problems of ex...

  11. Agency Theory

    DEFF Research Database (Denmark)

    Linder, Stefan; Foss, Nicolai Juul

    Agency theory studies the problems and solutions linked to delegation of tasks from principals to agents in the context of conflicting interests between the parties. Beginning from clear assumptions about rationality, contracting and informational conditions, the theory addresses problems of ex a...... agency theory to enjoy considerable scientific impact on social science; however, it has also attracted considerable criticism.......Agency theory studies the problems and solutions linked to delegation of tasks from principals to agents in the context of conflicting interests between the parties. Beginning from clear assumptions about rationality, contracting and informational conditions, the theory addresses problems of ex...

  12. Ring theory

    CERN Document Server

    Rowen, Louis H

    1991-01-01

    This is an abridged edition of the author's previous two-volume work, Ring Theory, which concentrates on essential material for a general ring theory course while ommitting much of the material intended for ring theory specialists. It has been praised by reviewers:**""As a textbook for graduate students, Ring Theory joins the best....The experts will find several attractive and pleasant features in Ring Theory. The most noteworthy is the inclusion, usually in supplements and appendices, of many useful constructions which are hard to locate outside of the original sources....The audience of non

  13. Grounded theory.

    Science.gov (United States)

    Harris, Tina

    2015-04-29

    Grounded theory is a popular research approach in health care and the social sciences. This article provides a description of grounded theory methodology and its key components, using examples from published studies to demonstrate practical application. It aims to demystify grounded theory for novice nurse researchers, by explaining what it is, when to use it, why they would want to use it and how to use it. It should enable nurse researchers to decide if grounded theory is an appropriate approach for their research, and to determine the quality of any grounded theory research they read.

  14. Multiple sequence alignment accuracy and phylogenetic inference.

    Science.gov (United States)

    Ogden, T Heath; Rosenberg, Michael S

    2006-04-01

    Phylogenies are often thought to be more dependent upon the specifics of the sequence alignment rather than on the method of reconstruction. Simulation of sequences containing insertion and deletion events was performed in order to determine the role that alignment accuracy plays during phylogenetic inference. Data sets were simulated for pectinate, balanced, and random tree shapes under different conditions (ultrametric equal branch length, ultrametric random branch length, nonultrametric random branch length). Comparisons between hypothesized alignments and true alignments enabled determination of two measures of alignment accuracy, that of the total data set and that of individual branches. In general, our results indicate that as alignment error increases, topological accuracy decreases. This trend was much more pronounced for data sets derived from more pectinate topologies. In contrast, for balanced, ultrametric, equal branch length tree shapes, alignment inaccuracy had little average effect on tree reconstruction. These conclusions are based on average trends of many analyses under different conditions, and any one specific analysis, independent of the alignment accuracy, may recover very accurate or inaccurate topologies. Maximum likelihood and Bayesian, in general, outperformed neighbor joining and maximum parsimony in terms of tree reconstruction accuracy. Results also indicated that as the length of the branch and of the neighboring branches increase, alignment accuracy decreases, and the length of the neighboring branches is the major factor in topological accuracy. Thus, multiple-sequence alignment can be an important factor in downstream effects on topological reconstruction.

  15. Anatomy-aware measurement of segmentation accuracy

    Science.gov (United States)

    Tizhoosh, H. R.; Othman, A. A.

    2016-03-01

    Quantifying the accuracy of segmentation and manual delineation of organs, tissue types and tumors in medical images is a necessary measurement that suffers from multiple problems. One major shortcoming of all accuracy measures is that they neglect the anatomical significance or relevance of different zones within a given segment. Hence, existing accuracy metrics measure the overlap of a given segment with a ground-truth without any anatomical discrimination inside the segment. For instance, if we understand the rectal wall or urethral sphincter as anatomical zones, then current accuracy measures ignore their significance when they are applied to assess the quality of the prostate gland segments. In this paper, we propose an anatomy-aware measurement scheme for segmentation accuracy of medical images. The idea is to create a "master gold" based on a consensus shape containing not just the outline of the segment but also the outlines of the internal zones if existent or relevant. To apply this new approach to accuracy measurement, we introduce the anatomy-aware extensions of both Dice coefficient and Jaccard index and investigate their effect using 500 synthetic prostate ultrasound images with 20 different segments for each image. We show that through anatomy-sensitive calculation of segmentation accuracy, namely by considering relevant anatomical zones, not only the measurement of individual users can change but also the ranking of users' segmentation skills may require reordering.

  16. Stability and accuracy control of k · p parameters

    Science.gov (United States)

    Bastos, Carlos M. O.; Sabino, Fernando P.; Faria Junior, Paulo E.; Campos, Tiago; Da Silva, Juarez L. F.; Sipahi, Guilherme M.

    2016-10-01

    The k · p method is a successful approach to obtain band structure, optical and transport properties of semiconductors and it depends on external parameters that are obtained either from experiments, tight binding or ab initio calculations. Despite the widespread use of the k · p method, a systematic analysis of the stability and the accuracy of its parameters is not usual in the literature. In this work, we report a theoretical framework to determine the k · p parameters from state-of-the-art hybrid density functional theory including spin-orbit coupling, providing a calculation where the gap and spin-orbit energy splitting are in agreement with the experimental values. The accuracy of the set of parameters is enhanced by fitting over several directions at once, minimizing the overall deviation from the original data. This strategy allows us to systematically evaluate the stability, preserving the accuracy of the parameters, providing a tool to determine optimal parameters for specific ranges around the Γ-point. To prove our concept, we investigate the zinc blende GaAs that shows results in excellent agreement with the most reliable data in the literature.

  17. Pesquisa de marcadores para os genes da cadeia pesada da beta-miosina cardíaca e da proteína C de ligação à miosina em familiares de pacientes com cardiomiopatia hipertrófica Research of markers for the genes of the heavy chain of cardiac beta-myosin and myosin binding protein C in relatives of patients with hypertrophic cardiomyopathy

    Directory of Open Access Journals (Sweden)

    Adriana Paula Tirone

    2005-06-01

    Full Text Available OBJETIVO: Estudar os marcadores moleculares para os genes da cadeia pesada da beta-miosina cardíaca e da proteína-C de ligação à miosina em familiares de portadores de cardiomiopatia hipertrófica. MÉTODOS: Foram estudadas 12 famílias que realizaram anamnese, exame físico, eletrocardiograma, ecocardiograma e coleta de sangue para o estudo genético através da reação em cadeia da polimerasse. RESULTADOS: Dos 227 familiares 25% eram acometidos, sendo 51% do sexo masculino com idade média de 35±19 (2 a 95 anos. A análise genética mostrou ligação com o gene da b-miosina cardíaca em uma família e, em outra, ligação com o gene da proteína C de ligação à miosina. Em cinco famílias foram excluídas ligações com os dois genes; em duas, a ligação com o gene da proteína C de ligação à miosina, porém para o gene da b-miosina os resultados foram inconclusivos; em duas famílias os resultados foram inconclusivos para os dois genes e em uma foi excluída ligação para o gene da b-miosina mas ficou inconclusivo para o gene da proteína C de ligação à miosina. CONCLUSÃO: Em nosso meio, talvez predominem outros genes que não aqueles descritos na literatura, ou que existam outras diferenças genéticas relacionadas com a origem de nossa população e/ou fatores ambientais.OBJECTIVE: To study the molecular markers for the genes of the heavy chain of cardiac beta-myosin and the myosin binding protein C in relatives of carriers of hypertrophic cardiomyopathy. METHODS: Twelve families who had anamnesis, physical exam, electrocardiogram, echocardiogram and blood collection for the genetic study through the chain reaction of polymerase. RESULTS: From the 227 relatives, 25% were ill-taken, with 51% men, with an average age of 35±19 (2 to 95 years old. The genetic analysis showed a connection with the gene of the cardiac b-myosin in a family and, in another, a connection with the gene of the myosin-binding protein C. In five

  18. The Theory of Variances in Equilibrium Reconstruction

    Energy Technology Data Exchange (ETDEWEB)

    Zakharov, Leonid E.; Lewandowski, Jerome; Foley, Elizabeth L.; Levinton, Fred M.; Yuh, Howard Y.; Drozdov, Vladimir; McDonald, Darren

    2008-01-14

    The theory of variances of equilibrium reconstruction is presented. It complements existing practices with information regarding what kind of plasma profiles can be reconstructed, how accurately, and what remains beyond the abilities of diagnostic systems. The σ-curves, introduced by the present theory, give a quantitative assessment of quality of effectiveness of diagnostic systems in constraining equilibrium reconstructions. The theory also suggests a method for aligning the accuracy of measurements of different physical nature.

  19. Caracterização microestrutural e propriedades mecânicas da liga de alumínio 2198-T851 em configuração tailored blank soldada por FSW - Friction Stir Welding

    Directory of Open Access Journals (Sweden)

    Ivan Moroz

    2012-03-01

    Full Text Available Nos setores industriais relacionados à aeronáutica e automobilística, tem-se buscado o desenvolvimento e a aplicação de ligas metálicas leves com o intuito da redução de massa dos produtos e consequente redução do consumo de combustível. Por suas dimensões e requisitos estruturais, componentes e seções de aviões e automóveis são produzidos através da união por processos de soldagem por fusão. Entretanto, processos de soldagem no estado sólido são preferíveis por evitar defeitos decorrentes da fusão, e têm sido objeto de estudo nas últimas duas décadas. Este trabalho teve por objetivo a caracterização de uma solda por FSW - Friction Stir Welding em junta de topo, da Liga de Alumínio 2198-T851 com espessuras diferentes (configuração "Tailored Blanks". A metodologia utilizada na caracterização envolveu a determinação das propriedades mecânicas das juntas soldadas, compreendendo ensaios de tração e determinação de perfil de microdureza na seção transversal; e buscou-se compreender a relação entre as alterações microestruturais promovidas pelo processo de soldagem e as propriedades resultantes. Concluiu-se que, devido aos fenômenos metalúrgicos decorrentes do processo de soldagem utilizado, alterações microestruturais tais como refino de grão, encruamento e dissolução/formação de fases precipitadas permitiram a obtenção de uma solda cujas propriedades mecânicas de tração (salvo alongamento igualaram-se a ou excederam aquelas do metal base, evidenciando a viabilidade de utilização dos parâmetros de soldagem por FSW utilizados neste trabalho.In both aeronautic and automobile related industries, development and application of light-weighted metallic alloys have been pursued with the intention of reducing product weight and consequent fuel consumption. Due to their dimension and structural requirements, components and sections from airplanes and automobiles are produced through fusion

  20. Herança e ligação em locos isoenzimáticos de Caesalpinia echinata L. (pau-brasil. Inheritance and linkage in isozyme loci of Caesalpinia echinata L. (pau-brasil.

    Directory of Open Access Journals (Sweden)

    João del GIUDICE-NETO

    2004-12-01

    Full Text Available Este artigo apresenta o estudo davariação isoenzimática em Caesalpinia echinata L.(pau-brasil. Onze sistemas enzimáticos (ACP,DIA, EST, G6PDH, GOT, LAP, MDH, PGI, PRX,SKDH e 6PGDH codificando dezoito locos (Acp-1,Est-3, Dia-1, G6pdh-1, Got-1, Lap-1, Mdh-1,Mdh-2, Mdh-3, Pgi-1, Pgi-2, Prx-1, Prx-2, Prx-3,Prx-4, Skdh-1, 6pgdh-1 e 6pgdh-2 foraminvestigados. Entre esses locos, Pgi-1 e Got-1foram detectados como monomórficos. Três locos(Mdh-2, G6pdh-1 e 6pgdh-1 não tiveram suaherança analisada devido à ausência de progênies deárvores heterozigotas na amostra. A herançamendeliana simples foi confirmada para dez locos(Acp-1, Dia-1, Est-3, Lap-1, Mdh-1, Mdh-3, Prx-1,Prx-3, Skdh-1 e 6pgdh-2. Três locos (Pgi-2, Prx-2e Prx-4 apresentaram desvios altamentesignificativos (P < 0,01 para a hipótese desegregação regular 1:1. As relações dedesequilíbrios de ligações foram avaliadas em 120pares de locos isoenzimáticos. Seis pares de locosapresentaram ligação: Mdh-3:Dia-1, Mdh-3:Prx-3,6pgdh-1:Pgi-2, 6pgdh-1:Prx-1, 6pgdh-2:Prx-3 ePgi-2:Prx-4.This article presents a study of isozymevariation in Caesalpinia echinata L. (brazilwood.Eleven isozyme systems (ACP, DIA, EST,G6PDH, GOT, LAP, MDH, PGI, PRX, SKDH and6PGDH codifying eighteen loci (Acp-1, Est-3,Dia-1, G6pdh-1, Got-1, Lap-1, Mdh-1, Mdh-2,Mdh-3, Pgi-1, Pgi-2, Prx-1, Prx-2, Prx-3, Prx-4,Skdh-1, 6pgdh-1 and 6pgdh-2 were investigated.Among these loci, Pgi-1 and Got-1 weremonomorphic. Three loci (Mdh-2, G6pdh-1 and6pgdh-1 were not evaluated for inheritance duethe lack of families from heterozygous mothertrees in the sampling. Mendelian inheritance wasconfirmed for ten allozyme loci (Acp-1, Dia-1,Est-3, Lap-1, Mdh-1, Mdh-3, Prx-1, Prx-3, Skdh-1,and 6pgdh-2. Three loci (Pgi-2, Prx-2 and Prx-4showed significant deviations (P < 0.01 from expectedsegregation 1:1 hypothesis. Linkage relationshipswere examined for 120 pairs of allozyme loci.Six pairs of loci showed linked: Mdh-3:Dia-1,Mdh-3:Prx-3, 6

  1. Social Security Administration Data for Enumeration Accuracy

    Data.gov (United States)

    Social Security Administration — This dataset provides data at the national level from federal fiscal year 2006 onwards for the accuracy of the assignment of Social Security numbers (SSN) based on...

  2. Systematic reviews of diagnostic test accuracy.

    Science.gov (United States)

    Leeflang, Mariska M G; Deeks, Jonathan J; Gatsonis, Constantine; Bossuyt, Patrick M M

    2008-12-16

    More and more systematic reviews of diagnostic test accuracy studies are being published, but they can be methodologically challenging. In this paper, the authors present some of the recent developments in the methodology for conducting systematic reviews of diagnostic test accuracy studies. Restrictive electronic search filters are discouraged, as is the use of summary quality scores. Methods for meta-analysis should take into account the paired nature of the estimates and their dependence on threshold. Authors of these reviews are advised to use the hierarchical summary receiver-operating characteristic or the bivariate model for the data analysis. Challenges that remain are the poor reporting of original diagnostic test accuracy studies and difficulties with the interpretation of the results of diagnostic test accuracy research.

  3. The accuracy of general practitioner workforce projections.

    NARCIS (Netherlands)

    Greuningen, M. van; Batenburg, R.S.; Velden, L.F.J. van der

    2013-01-01

    Background: Health workforce projections are important instruments to prevent imbalances in the health workforce. For both the tenability and further development of these projections, it is important to evaluate the accuracy of workforce projections. In the Netherlands, health workforce projections

  4. Strategies to Increase Accuracy in Text Classification

    NARCIS (Netherlands)

    D. Blommesteijn (Dennis)

    2014-01-01

    htmlabstractText classification via supervised learning involves various steps from processing raw data, features extraction to training and validating classifiers. Within these steps implementation decisions are critical to the resulting classifier accuracy. This paper contains a report of the

  5. Accuracy and Efficiency of Raytracing Photoionisation Algorithms

    CERN Document Server

    Mackey, Jonathan

    2012-01-01

    Three non-equilibrium photoionisation algorithms for hydrodynamical grid-based simulation codes are compared in terms of accuracy, timestepping criteria, and parallel scaling. Explicit methods with first order time accuracy for photon conservation must use very restrictive timestep criteria to accurately track R-type ionisation fronts. A second order accurate algorithm is described which, although it requires more work per step, allows much longer timesteps and is consequently more efficient. Implicit methods allow ionisation fronts to cross many grid cells per timestep while maintaining photon conservation accuracy. It is shown, however, that errors are much larger for multi-frequency radiation then for monochromatic radiation with the implicit algorithm used here, and large errors accrue when an ionisation front crosses many optical depths in a single step. The accuracy and convergence rates of the different algorithms are tested with a large number of timestepping criteria to identify the best criterion fo...

  6. Strategies to Increase Accuracy in Text Classification

    NARCIS (Netherlands)

    Blommesteijn, D.

    2014-01-01

    Text classification via supervised learning involves various steps from processing raw data, features extraction to training and validating classifiers. Within these steps implementation decisions are critical to the resulting classifier accuracy. This paper contains a report of the study performed

  7. Why cannot modest teams win the league? The influence of the match schedule on the profile of the winnings teams ¿Por qué no pueden ganar la liga los equipos modestos? La influencia del formato de competición, sobre el perfil de los equipos ganadores

    Directory of Open Access Journals (Sweden)

    C. Lago

    2010-09-01

    Full Text Available

    The aim of this study is to analyze the influence of performance and chance on the results obtained by teams in football official competitions with different formats of competition. The research is based in data from 190 matches of the 2006/2007 Spanish Football League, 64 matches of the 2006 World Cup Germany and 125 matches of the 2005/20006 European Champions League. Performance is measured as the difference between shots attempted and shots received by a team in each game. Results from linear regression analysis show that in competitions with a league system, (Spanish Football League, first round of the 2006 World Cup Germany and first round of the 2005/20006 European Champions League performance is a statistically significant variable for explaining the results obtained by teams. In competitions with a Knock-Out system (second round of the 2006 World Cup Germany and second round of the 2005/20006 European Champions League there is not statistically significant differences in the performance obtained by winners and losers. I find that chance is a relevant variable for explaining the results of teams in competitions with a Knock-Out system.
    Key words:Schedukle of competition, peformance, chance, football

     

    El objetivo de este trabajo es estudiar cuál es el efecto del rendimiento y la suerte sobre el resultado alcanzado por los equipos en competiciones oficiales de fútbol con diferentes formatos de competición. La muestra consiste en  los 190 partidos disputados en la primera vuelta de la Liga Española de Fútbol de la temporada 2006-2007, los 64 partidos disputados en el Campeonato Mundia1 de Fútbol de Alemania 2006 y los 125 partidos de la Liga de Campeones de la temporada 2005-2006. Mediante una estimación basada en el análisis de regresión lineal y en la comparaci

  8. Factors Affecting Accuracy of Data Abstracted from Medical Records.

    Directory of Open Access Journals (Sweden)

    Meredith N Zozus

    Full Text Available Medical record abstraction (MRA is often cited as a significant source of error in research data, yet MRA methodology has rarely been the subject of investigation. Lack of a common framework has hindered application of the extant literature in practice, and, until now, there were no evidence-based guidelines for ensuring data quality in MRA. We aimed to identify the factors affecting the accuracy of data abstracted from medical records and to generate a framework for data quality assurance and control in MRA.Candidate factors were identified from published reports of MRA. Content validity of the top candidate factors was assessed via a four-round two-group Delphi process with expert abstractors with experience in clinical research, registries, and quality improvement. The resulting coded factors were categorized into a control theory-based framework of MRA. Coverage of the framework was evaluated using the recent published literature.Analysis of the identified articles yielded 292 unique factors that affect the accuracy of abstracted data. Delphi processes overall refuted three of the top factors identified from the literature based on importance and five based on reliability (six total factors refuted. Four new factors were identified by the Delphi. The generated framework demonstrated comprehensive coverage. Significant underreporting of MRA methodology in recent studies was discovered.The framework generated from this research provides a guide for planning data quality assurance and control for studies using MRA. The large number and variability of factors indicate that while prospective quality assurance likely increases the accuracy of abstracted data, monitoring the accuracy during the abstraction process is also required. Recent studies reporting research results based on MRA rarely reported data quality assurance or control measures, and even less frequently reported data quality metrics with research results. Given the demonstrated

  9. Accuracy and Efficiency of Raytracing Photoionisation Algorithms

    OpenAIRE

    Mackey, Jonathan

    2012-01-01

    Three non-equilibrium photoionisation algorithms for hydrodynamical grid-based simulation codes are compared in terms of accuracy, timestepping criteria, and parallel scaling. Explicit methods with first-order time accuracy for photon conservation must use very restrictive timestep criteria to accurately track R-type ionisation fronts. A second-order accurate algorithm is described which, although it requires more work per step, allows much longer timesteps and is consequently more efficient....

  10. Moyamoya disease: diagnostic accuracy of MRI

    Energy Technology Data Exchange (ETDEWEB)

    Yamada, I. [Dept. of Radiology, Faculty of Medicine, Tokyo Medical and Dental Univ. (Japan); Suzuki, [Dept. of Radiology, Faculty of Medicine, Tokyo Medical and Dental Univ. (Japan); Matsushima, Y. [Dept. of Neurosurgery, Faculty of Medicine, Tokyo Medical and Dental Univ. (Japan)

    1995-07-01

    MRI may be employed to investigate moyamoya disease, since it provides vascular information without use of contrast medium. We reported the usefulness and limitations of MR angiography (MRA) in moyamoya disease. To our knowledge, no report has appeared dealing with the diagnostic accuracy of MRI in a large number of cases of moyamoya disease, although MRI is used more commonly than MRA. We therefore undertook to evaluate the accuracy of MRI in moyamoya disease. (orig.)

  11. Estudo de Procedimentos de Soldagem MIG/MAG para Aplicação de Revestimentos de Liga de Níquel Inconel 625 em Aço Estrutural ASTM A387 Gr.11

    Directory of Open Access Journals (Sweden)

    Nathália Escóssio Cavalcante

    2016-03-01

    Full Text Available Resumo O presente trabalho objetiva o estudo de técnicas de soldagem aplicadas a reparo de componentes fabricados em aço ASTM A387 Gr.11, largamente utilizado em aplicações da indústria do petróleo e gás. Devido ao regime de trabalho e necessidade de utilização de materiais com boa resistência mecânica e à corrosão, utilizou-se como metal de adição a liga UNS N06625 (Inconel 625. O processo de soldagem utilizado foi o MIG/MAG e a técnica de soldagem aplicada foi a dupla camada. A metodologia do presente trabalho foi dividida em etapas, sendo a primeira a realização de ensaios exploratórios para definir a relevância dos fatores de controle estudados. A segunda etapa consistiu na aplicação do critério de dureza e de microestrutura para definir as melhores relações de energia para aplicação da técnica da dupla camada. A técnica da dupla camada se mostrou eficaz na melhora das propriedades da microestrutura da ZAC-GG dos revestimentos, verificou-se intenso refinamento de grão. Houve também redução nas medidas de dureza e microdureza. Para ambos os gases de proteção utilizados (Ar+25%He e Ar+4%CO2 foi possível obter relações de energia com afastamentos positivos. Em todas essas relações a energia da segunda camada foi maior que a energia da primeira camada.

  12. Model theory

    CERN Document Server

    Chang, CC

    2012-01-01

    Model theory deals with a branch of mathematical logic showing connections between a formal language and its interpretations or models. This is the first and most successful textbook in logical model theory. Extensively updated and corrected in 1990 to accommodate developments in model theoretic methods - including classification theory and nonstandard analysis - the third edition added entirely new sections, exercises, and references. Each chapter introduces an individual method and discusses specific applications. Basic methods of constructing models include constants, elementary chains, Sko

  13. Viability Theory

    CERN Document Server

    Aubin, Jean-Pierre; Saint-Pierre, Patrick

    2011-01-01

    Viability theory designs and develops mathematical and algorithmic methods for investigating the adaptation to viability constraints of evolutions governed by complex systems under uncertainty that are found in many domains involving living beings, from biological evolution to economics, from environmental sciences to financial markets, from control theory and robotics to cognitive sciences. It involves interdisciplinary investigations spanning fields that have traditionally developed in isolation. The purpose of this book is to present an initiation to applications of viability theory, explai

  14. Field theory

    CERN Document Server

    Roman, Steven

    2006-01-01

    Intended for graduate courses or for independent study, this book presents the basic theory of fields. The first part begins with a discussion of polynomials over a ring, the division algorithm, irreducibility, field extensions, and embeddings. The second part is devoted to Galois theory. The third part of the book treats the theory of binomials. The book concludes with a chapter on families of binomials - the Kummer theory. This new edition has been completely rewritten in order to improve the pedagogy and to make the text more accessible to graduate students.  The exercises have also been im

  15. Elastoplasticity theory

    CERN Document Server

    Hashiguchi, Koichi

    2009-01-01

    This book details the mathematics and continuum mechanics necessary as a foundation of elastoplasticity theory. It explains physical backgrounds with illustrations and provides descriptions of detailed derivation processes..

  16. Galois Theory

    CERN Document Server

    Cox, David A

    2012-01-01

    Praise for the First Edition ". . .will certainly fascinate anyone interested in abstract algebra: a remarkable book!"—Monatshefte fur Mathematik Galois theory is one of the most established topics in mathematics, with historical roots that led to the development of many central concepts in modern algebra, including groups and fields. Covering classic applications of the theory, such as solvability by radicals, geometric constructions, and finite fields, Galois Theory, Second Edition delves into novel topics like Abel’s theory of Abelian equations, casus irreducibili, and the Galo

  17. Game theory.

    Science.gov (United States)

    Dufwenberg, Martin

    2011-03-01

    Game theory is a toolkit for examining situations where decision makers influence each other. I discuss the nature of game-theoretic analysis, the history of game theory, why game theory is useful for understanding human psychology, and why game theory has played a key role in the recent explosion of interest in the field of behavioral economics. WIREs Cogni Sci 2011 2 167-173 DOI: 10.1002/wcs.119 For further resources related to this article, please visit the WIREs website.

  18. Caracterização microestrutural e comportamento mecânico das ligas de alumínio AA2139 T3 e T8 soldadas por fricção rotativa com mistura Microstructural characterization and mechanical behavior of an AA2139 T3 and T8 aluminum alloy joined by friction stir welding (FSW

    Directory of Open Access Journals (Sweden)

    Vinícius Toledo Saccon

    2010-12-01

    Full Text Available Este trabalho visou analisar a caracterização microestrutural e o comportamento mecânico das ligas de alumínio AA2139 T3 e T8 quando são soldadas pelo processo Soldagem por Fricção Rotativa com Mistura, o qual é realizado na fase sólida. A análise microestrutural foi realizada utilizando microscopia óptica e eletrônica de varredura, e o comportamento mecânico foi avaliado através de medidas de microdureza e ensaio de tração convencional complementado pelo sistema ARAMIS. As ligas foram soldadas nos mesmos parâmetros de soldagem e com a mesma ferramenta, a fim de avaliar a qualidade da junta soldada para as duas condições de tratamento térmico, T3 e T8. Os resultados obtidos mostraram soldas resistentes para ambos os tratamentos térmicos, porém com melhores propriedades mecânicas para a liga AA2139 T3.This work aimed to study the microstructural characterization and mechanical behavior of AA2139 T3 and T8 aluminum alloys joined by FSW - Friction Stir Welding. The microstructural analysis has been done using optical microscope and scanning electron microscopy, and the mechanical analysis were evaluate through microhardness testing and conventional tensile test using the ARAMIS system . Each alloy were welded using the same welding parameters and the same tool in order to evaluate the joint quality for both heat treatment used for this work, T3 and T8. The result showed sounds joints for both heat treatments, although with better mechanical properties for the alloy AA2139 T3.

  19. Os inimigos da nação: a Liga Brasileira pelos Aliados e os discursos sobre o “perigo alemão” durante a grande guerra (1915-1919 = The national enemies: the Brazilian League for the Allies and the ideas about the “germany danger’ in the great war (1915-1919

    Directory of Open Access Journals (Sweden)

    Pires, Livia Claro

    2015-01-01

    Full Text Available O presente artigo tem por objetivo analisar os discursos da Liga Brasileira pelos Aliados sobre o “perigo alemão”, e, dessa forma, entender as ideias e construções da associação acerca da identidade nacional brasileira. A Liga pelos Aliados foi fundada em 1915, tendo à frente importantes nomes da cena intelectual carioca e nacional, como José Veríssimo, Graça Aranha e Rui Barbosa. Atuou ao longo dos anos de guerra como um polo de propaganda dos países da Entente em solo brasileiro, divulgando textos na imprensa fluminense e promovendo eventos beneficentes na capital federal. No entanto, seus discursos guardam mais do que a promoção da “causa aliada”: exprimem uma preocupação com a definição da identidade nacional. Tais ideias tornam-se evidentes quando a entidade edificou uma fala pungente contra os imigrantes de origem germânica residentes no Brasil, estendendo aos seus núcleos não apenas a antipatia dirigida ao Império Alemão, como a desconfiança quanto à sua participação num plano de fragmentação e dominação do território brasileiro. A partir da construção do “outro”, da figura a ser excluída do seio da comunidade, a Liga Brasileira pelos Aliados expôs o que acreditava serem os aspectos de compatibilidade e reconhecimento, do que definia o brasileiro nas primeiras décadas do século XX

  20. Pesquisa de marcadores para os genes da cadeia pesada da beta-miosina cardíaca e da proteína C de ligação à miosina em familiares de pacientes com cardiomiopatia hipertrófica

    OpenAIRE

    Tirone,Adriana Paula; Arteaga,Edmundo; Pereira, Alexandre da Costa; Krieger, José Eduardo; Buck,Paula de Cássia; IANNI, Barbara Maria; Mady,Charles

    2005-01-01

    OBJETIVO: Estudar os marcadores moleculares para os genes da cadeia pesada da beta-miosina cardíaca e da proteína-C de ligação à miosina em familiares de portadores de cardiomiopatia hipertrófica. MÉTODOS: Foram estudadas 12 famílias que realizaram anamnese, exame físico, eletrocardiograma, ecocardiograma e coleta de sangue para o estudo genético através da reação em cadeia da polimerasse. RESULTADOS: Dos 227 familiares 25% eram acometidos, sendo 51% do sexo masculino com idade média de 35±19...

  1. El perfil antropom?trico y las capacidades f?sicas b?sicas de los futbolistas de la categor?a sub ? 12 de Liga Deportiva Universitaria de Quito (L.D.U.Q) determina la posici?n de juego

    OpenAIRE

    Guevara Guevara, Mar?a Paulina

    2014-01-01

    Se trata de un estudio transversal realizado con 28 jugadores de f?tbol de la categor?a sub - 12 de Liga Deportiva Universitaria de Quito (L.D.U.Q) en su participaci?n en el campeonato realizado por la Asociaci?n de F?tbol No Amateur de Pichincha (AFNA) en el a?o 2012. Las variables estudiadas incluyeron edad, etnia, regi?n de procedencia, posici?n de juego, antropometr?a y capacidades f?sicas b?sicas. Para el perfil antropom?trico se midieron 6 pliegue cut?neos (tr?ceps, subescapular, suprai...

  2. Avaliação da geometria de ferramenta e parâmetros do processo FSW na soldagem da liga de alumínio AA 5052 Process parameters and tool geometry evaluation in the FSW of AA 5052 aluminum alloy

    OpenAIRE

    2009-01-01

    A soldagem de ligas de alumínio sem degradação excessiva das propriedades originais do metal base apresenta-se como um obstáculo a ser superado pelas indústrias em seus processos de fabricação, uma vez que o alumínio tem sido usado cada vez de forma mais intensiva. Neste sentido, o processo de soldagem denominado Friction Stir Welding (FSW) tem recebido atenção por suas potencialidades onde o aporte de calor deve ser minimizado ou quando metais dissimilares devem ser soldados. Neste processo,...

  3. Potential theory of radiation

    Science.gov (United States)

    Chiu, Huei-Huang

    1989-01-01

    A theoretical method is being developed by which the structure of a radiation field can be predicted by a radiation potential theory, similar to a classical potential theory. The introduction of a scalar potential is justified on the grounds that the spectral intensity vector is irrotational. The vector is also solenoidal in the limits of a radiation field in complete radiative equilibrium or in a vacuum. This method provides an exact, elliptic type equation that will upgrade the accuracy and the efficiency of the current CFD programs required for the prediction of radiation and flow fields. A number of interesting results emerge from the present study. First, a steady state radiation field exhibits an optically modulated inverse square law distribution character. Secondly, the unsteady radiation field is structured with two conjugate scalar potentials. Each is governed by a Klein-Gordon equation with a frictional force and a restoring force. This steady potential field structure and the propagation of radiation potentials are consistent with the well known results of classical electromagnetic theory. The extension of the radiation potential theory for spray combustion and hypersonic flow is also recommended.

  4. The influence of affective empathy and autism spectrum traits on empathic accuracy

    NARCIS (Netherlands)

    Aan Het Rot, Marije; Hogenelst, Koen

    2014-01-01

    Autism spectrum disorder is characterized by interpersonal deficits and has been associated with limited cognitive empathy, which includes perspective taking, theory of mind, and empathic accuracy (EA). The capacity for affective empathy may also be impaired. In the present study we aimed to determi

  5. The influence of affective empathy and autism spectrum traits on empathic accuracy

    NARCIS (Netherlands)

    Aan Het Rot, Marije; Hogenelst, Koen

    2014-01-01

    Autism spectrum disorder is characterized by interpersonal deficits and has been associated with limited cognitive empathy, which includes perspective taking, theory of mind, and empathic accuracy (EA). The capacity for affective empathy may also be impaired. In the present study we aimed to

  6. The control of manual entry accuracy in management/engineering information systems, phase 1

    Science.gov (United States)

    Hays, Daniel; Nocke, Henry; Wilson, Harold; Woo, John, Jr.; Woo, June

    1987-01-01

    It was shown that clerical personnel can be tested for proofreading performance under simulated industrial conditions. A statistical study showed that errors in proofreading follow an extreme value probability theory. The study showed that innovative man/machine interfaces can be developed to improve and control accuracy during data entry.

  7. Accuracy of Protein Embedding Potentials: An Analysis in Terms of Electrostatic Potentials

    DEFF Research Database (Denmark)

    Olsen, Jogvan Magnus Haugaard; List, Nanna Holmgaard; Kristensen, Kasper;

    2015-01-01

    Quantum-mechanical embedding methods have in recent years gained significant interest and may now be applied to predict a wide range of molecular properties calculated at different levels of theory. To reach a high level of accuracy in embedding methods, both the electronic structure model of the...

  8. Peer-Mediated vs. Individual Writing: Measuring Fluency, Complexity, and Accuracy in Writing

    Science.gov (United States)

    Soleimani, Maryam; Modirkhamene, Sima; Sadeghi, Karim

    2017-01-01

    Drawing upon Vygotsky's Sociocultural Theory (SCT), this study aimed at investigating the effect of two writing modes, namely, peer-mediated/collaborative vs. individual writing on measures of fluency, accuracy, and complexity of female EFL learners' writing. Based on an in-house placement test and the First Certificate in English writing paper, a…

  9. The influence of affective empathy and autism spectrum traits on empathic accuracy

    NARCIS (Netherlands)

    Aan Het Rot, Marije; Hogenelst, Koen

    2014-01-01

    Autism spectrum disorder is characterized by interpersonal deficits and has been associated with limited cognitive empathy, which includes perspective taking, theory of mind, and empathic accuracy (EA). The capacity for affective empathy may also be impaired. In the present study we aimed to determi

  10. Quantum Theory

    CERN Document Server

    Manning, Phillip

    2011-01-01

    The study of quantum theory allowed twentieth-century scientists to examine the world in a new way, one that was filled with uncertainties and probabilities. Further study also led to the development of lasers, the atomic bomb, and the computer. This exciting new book clearly explains quantum theory and its everyday uses in our world.

  11. Shielding Theory

    Directory of Open Access Journals (Sweden)

    Ion N.Chiuta

    2009-05-01

    Full Text Available The paper determines relations for shieldingeffectiveness relative to several variables, includingmetal type, metal properties, thickness, distance,frequency, etc. It starts by presenting some relationshipsregarding magnetic, electric and electromagnetic fieldsas a pertinent background to understanding and applyingfield theory. Since literature about electromagneticcompatibility is replete with discussions about Maxwellequations and field theory only a few aspects arepresented.

  12. FINITE DEFORMATION ELASTO-PLASTIC THEORY AND CONSISTENT ALGORITHM

    Institute of Scientific and Technical Information of China (English)

    Liu Xuejun; Li Mingrui; Huang Wenbin

    2001-01-01

    By using the logarithmic strain, the finite deformation plastic theory, corresponding to the infinitesimal plastic theory, is established successively. The plastic consistent algorithm with first order accuracy for the finite element method (FEM) is developed. Numerical examples are presented to illustrate the validity of the theory and effectiveness of the algorithm.

  13. Uncertainty theory

    CERN Document Server

    Liu, Baoding

    2015-01-01

    When no samples are available to estimate a probability distribution, we have to invite some domain experts to evaluate the belief degree that each event will happen. Perhaps some people think that the belief degree should be modeled by subjective probability or fuzzy set theory. However, it is usually inappropriate because both of them may lead to counterintuitive results in this case. In order to rationally deal with belief degrees, uncertainty theory was founded in 2007 and subsequently studied by many researchers. Nowadays, uncertainty theory has become a branch of axiomatic mathematics for modeling belief degrees. This is an introductory textbook on uncertainty theory, uncertain programming, uncertain statistics, uncertain risk analysis, uncertain reliability analysis, uncertain set, uncertain logic, uncertain inference, uncertain process, uncertain calculus, and uncertain differential equation. This textbook also shows applications of uncertainty theory to scheduling, logistics, networks, data mining, c...

  14. Conspiracy Theory

    DEFF Research Database (Denmark)

    Bjerg, Ole; Presskorn-Thygesen, Thomas

    2017-01-01

    The paper is a contribution to current debates about conspiracy theories within philosophy and cultural studies. Wittgenstein’s understanding of language is invoked to analyse the epistemological effects of designating particular questions and explanations as a ‘conspiracy theory......’. It is demonstrated how such a designation relegates these questions and explanations beyond the realm of meaningful discourse. In addition, Agamben’s concept of sovereignty is applied to explore the political effects of using the concept of conspiracy theory. The exceptional epistemological status assigned...... to alleged conspiracy theories within our prevalent paradigms of knowledge and truth is compared to the exceptional legal status assigned to individuals accused of terrorism under the War on Terror. The paper concludes by discussing the relation between conspiracy theory and ‘the paranoid style...

  15. Potential Theory

    CERN Document Server

    Lukeš, Jaroslav; Netuka, Ivan; Veselý, Jiří

    1988-01-01

    Within the tradition of meetings devoted to potential theory, a conference on potential theory took place in Prague on 19-24, July 1987. The Conference was organized by the Faculty of Mathematics and Physics, Charles University, with the collaboration of the Institute of Mathematics, Czechoslovak Academy of Sciences, the Department of Mathematics, Czech University of Technology, the Union of Czechoslovak Mathematicians and Physicists, the Czechoslovak Scientific and Technical Society, and supported by IMU. During the Conference, 69 scientific communications from different branches of potential theory were presented; the majority of them are in­ cluded in the present volume. (Papers based on survey lectures delivered at the Conference, its program as well as a collection of problems from potential theory will appear in a special volume of the Lecture Notes Series published by Springer-Verlag). Topics of these communications truly reflect the vast scope of contemporary potential theory. Some contributions deal...

  16. Concept theory

    DEFF Research Database (Denmark)

    Hjørland, Birger

    2009-01-01

      Concept theory is an extremely broad, interdisciplinary and complex field of research related to many deep fields with very long historical traditions without much consensus. However, information science and knowledge organization cannot avoid relating to theories of concepts. Knowledge...... organizing systems (e.g. classification systems, thesauri and ontologies) should be understood as systems basically organizing concepts and their semantic relations. The same is the case with information retrieval systems. Different theories of concepts have different implications for how to construe......, evaluate and use such systems. Based on "a post-Kuhnian view" of paradigms this paper put forward arguments that the best understanding and classification of theories of concepts is to view and classify them in accordance with epistemological theories (empiricism, rationalism, historicism and pragmatism...

  17. Conspiracy Theory

    DEFF Research Database (Denmark)

    Bjerg, Ole; Presskorn-Thygesen, Thomas

    2017-01-01

    The paper is a contribution to current debates about conspiracy theories within philosophy and cultural studies. Wittgenstein’s understanding of language is invoked to analyse the epistemological effects of designating particular questions and explanations as a ‘conspiracy theory......’. It is demonstrated how such a designation relegates these questions and explanations beyond the realm of meaningful discourse. In addition, Agamben’s concept of sovereignty is applied to explore the political effects of using the concept of conspiracy theory. The exceptional epistemological status assigned...... to alleged conspiracy theories within our prevalent paradigms of knowledge and truth is compared to the exceptional legal status assigned to individuals accused of terrorism under the War on Terror. The paper concludes by discussing the relation between conspiracy theory and ‘the paranoid style...

  18. Improvements in accuracy of dense OPC models

    Science.gov (United States)

    Kallingal, Chidam; Oberschmidt, James; Viswanathan, Ramya; Abdo, Amr; Park, OSeo

    2008-10-01

    Performing model-based optical proximity correction (MBOPC) on layouts has become an integral part of patterning advanced integrated circuits. Earlier technologies used sparse OPC, the run times of which explode when the density of layouts increases. With the move to 45 nm technology node, this increase in run time has resulted in a shift to dense simulation OPC, which is pixel-based. The dense approach becomes more efficient at 45nm technology node and beyond. New OPC model forms can be used with the dense simulation OPC engine, providing the greater accuracy required by smaller technology nodes. Parameters in the optical model have to be optimized to achieve the required accuracy. Dense OPC uses a resist model with a different set of parameters than sparse OPC. The default search ranges used in the optimization of these resist parameters do not always result in the best accuracy. However, it is possible to improve the accuracy of the resist models by understanding the restrictions placed on the search ranges of the physical parameters during optimization. This paper will present results showing the correlation between accuracy of the models and some of these optical and resist parameters. The results will show that better optimization can improve the model fitness of features in both the calibration and verification set.

  19. High Accuracy Imaging Polarimetry with NICMOS

    CERN Document Server

    Batcheldor, D; Hines, D C; Schmidt, G D; Axon, D J; Robinson, A; Sparks, W; Tadhunter, C

    2008-01-01

    The ability of NICMOS to perform high accuracy polarimetry is currently hampered by an uncalibrated residual instrumental polarization at a level of 1.2-1.5%. To better quantify and characterize this residual we obtained observations of three polarimetric standard stars at three separate space-craft roll angles. Combined with archival data, these observations were used to characterize the residual instrumental polarization to enable NICMOS to reach its full polarimetric potential. Using these data, we calculate values of the parallel transmission coefficients that reproduce the ground-based results for the polarimetric standards. The uncertainties associated with the parallel transmission coefficients, a result of the photometric repeatability of the observations, dominate the accuracy of p and theta. However, the new coefficients now enable imaging polarimetry of targets with p~1.0% at an accuracy of +/-0.6% and +/-15 degrees.

  20. Why do delayed summaries improve metacomprehension accuracy?

    Science.gov (United States)

    Anderson, Mary C M; Thiede, Keith W

    2008-05-01

    We showed that metacomprehension accuracy improved when participants (N=87 college students) wrote summaries of texts prior to judging their comprehension; however, accuracy only improved when summaries were written after a delay, not when written immediately after reading. We evaluated two hypotheses proposed to account for this delayed-summarization effect (the accessibility hypothesis and the situation model hypothesis). The data suggest that participants based metacomprehension judgments more on the gist of texts when they generated summaries after a delay; whereas, they based judgments more on details when they generated summaries immediately after reading. Focusing on information relevant to the situation model of a text (the gist of a text) produced higher levels of metacomprehension accuracy, which is consistent with situation model hypothesis.

  1. Social class, contextualism, and empathic accuracy.

    Science.gov (United States)

    Kraus, Michael W; Côté, Stéphane; Keltner, Dacher

    2010-11-01

    Recent research suggests that lower-class individuals favor explanations of personal and political outcomes that are oriented to features of the external environment. We extended this work by testing the hypothesis that, as a result, individuals of a lower social class are more empathically accurate in judging the emotions of other people. In three studies, lower-class individuals (compared with upper-class individuals) received higher scores on a test of empathic accuracy (Study 1), judged the emotions of an interaction partner more accurately (Study 2), and made more accurate inferences about emotion from static images of muscle movements in the eyes (Study 3). Moreover, the association between social class and empathic accuracy was explained by the tendency for lower-class individuals to explain social events in terms of features of the external environment. The implications of class-based patterns in empathic accuracy for well-being and relationship outcomes are discussed.

  2. Decreased interoceptive accuracy following social exclusion.

    Science.gov (United States)

    Durlik, Caroline; Tsakiris, Manos

    2015-04-01

    The need for social affiliation is one of the most important and fundamental human needs. Unsurprisingly, humans display strong negative reactions to social exclusion. In the present study, we investigated the effect of social exclusion on interoceptive accuracy - accuracy in detecting signals arising inside the body - measured with a heartbeat perception task. We manipulated exclusion using Cyberball, a widely used paradigm of a virtual ball-tossing game, with half of the participants being included during the game and the other half of participants being ostracized during the game. Our results indicated that heartbeat perception accuracy decreased in the excluded, but not in the included, participants. We discuss these results in the context of social and physical pain overlap, as well as in relation to internally versus externally oriented attention.

  3. Bayesian Theory

    CERN Document Server

    Bernardo, Jose M

    2000-01-01

    This highly acclaimed text, now available in paperback, provides a thorough account of key concepts and theoretical results, with particular emphasis on viewing statistical inference as a special case of decision theory. Information-theoretic concepts play a central role in the development of the theory, which provides, in particular, a detailed discussion of the problem of specification of so-called prior ignorance . The work is written from the authors s committed Bayesian perspective, but an overview of non-Bayesian theories is also provided, and each chapter contains a wide-ranging critica

  4. Psychodynamic Theory

    Directory of Open Access Journals (Sweden)

    Kathleen Holtz Deal

    2007-05-01

    Full Text Available Psychodynamic theory, a theory of personality originated by Sigmund Freud, has a long and complex history within social work and continues to be utilized by social workers. This article traces the theory’s development and explains key concepts with an emphasis on its current relational focus within object relations theory and self-psychology. Empirical support for theoretical concepts and the effectiveness of psychodynamic therapies is reviewed and critiqued. Future directions are discussed, including addressing cultural considerations, increasing research, and emphasizing a relational paradigm

  5. Number theory

    CERN Document Server

    Andrews, George E

    1994-01-01

    Although mathematics majors are usually conversant with number theory by the time they have completed a course in abstract algebra, other undergraduates, especially those in education and the liberal arts, often need a more basic introduction to the topic.In this book the author solves the problem of maintaining the interest of students at both levels by offering a combinatorial approach to elementary number theory. In studying number theory from such a perspective, mathematics majors are spared repetition and provided with new insights, while other students benefit from the consequent simpl

  6. Mapping Theory

    DEFF Research Database (Denmark)

    Smith, Shelley

    This paper came about within the context of a 13-month research project, Focus Area 1 - Method and Theory, at the Center for Public Space Research at the Royal Academy of the Arts School of Architecture in Copenhagen, Denmark. This project has been funded by RealDania. The goals of the research...... project, Focus Area 1 - Method and Theory, which forms the framework for this working paper, are: * To provide a basis from which to discuss the concept of public space in a contemporary architectural and urban context - specifically relating to theory and method * To broaden the discussion of the concept...

  7. Plasticity theory

    CERN Document Server

    Lubliner, Jacob

    2008-01-01

    The aim of Plasticity Theory is to provide a comprehensive introduction to the contemporary state of knowledge in basic plasticity theory and to its applications. It treats several areas not commonly found between the covers of a single book: the physics of plasticity, constitutive theory, dynamic plasticity, large-deformation plasticity, and numerical methods, in addition to a representative survey of problems treated by classical methods, such as elastic-plastic problems, plane plastic flow, and limit analysis; the problem discussed come from areas of interest to mechanical, structural, and

  8. Field Accuracy Test of Rpas Photogrammetry

    Science.gov (United States)

    Barry, P.; Coakley, R.

    2013-08-01

    Baseline Surveys Ltd is a company which specialises in the supply of accurate geospatial data, such as cadastral, topographic and engineering survey data to commercial and government bodies. Baseline Surveys Ltd invested in aerial drone photogrammetric technology and had a requirement to establish the spatial accuracy of the geographic data derived from our unmanned aerial vehicle (UAV) photogrammetry before marketing our new aerial mapping service. Having supplied the construction industry with survey data for over 20 years, we felt that is was crucial for our clients to clearly understand the accuracy of our photogrammetry so they can safely make informed spatial decisions, within the known accuracy limitations of our data. This information would also inform us on how and where UAV photogrammetry can be utilised. What we wanted to find out was the actual accuracy that can be reliably achieved using a UAV to collect data under field conditions throughout a 2 Ha site. We flew a UAV over the test area in a "lawnmower track" pattern with an 80% front and 80% side overlap; we placed 45 ground markers as check points and surveyed them in using network Real Time Kinematic Global Positioning System (RTK GPS). We specifically designed the ground markers to meet our accuracy needs. We established 10 separate ground markers as control points and inputted these into our photo modelling software, Agisoft PhotoScan. The remaining GPS coordinated check point data were added later in ArcMap to the completed orthomosaic and digital elevation model so we could accurately compare the UAV photogrammetry XYZ data with the RTK GPS XYZ data at highly reliable common points. The accuracy we achieved throughout the 45 check points was 95% reliably within 41 mm horizontally and 68 mm vertically and with an 11.7 mm ground sample distance taken from a flight altitude above ground level of 90 m.The area covered by one image was 70.2 m × 46.4 m, which equals 0.325 Ha. This finding has shown

  9. Systematic reviews of diagnostic test accuracy

    DEFF Research Database (Denmark)

    Leeflang, Mariska M G; Deeks, Jonathan J; Gatsonis, Constantine

    2008-01-01

    More and more systematic reviews of diagnostic test accuracy studies are being published, but they can be methodologically challenging. In this paper, the authors present some of the recent developments in the methodology for conducting systematic reviews of diagnostic test accuracy studies....... Restrictive electronic search filters are discouraged, as is the use of summary quality scores. Methods for meta-analysis should take into account the paired nature of the estimates and their dependence on threshold. Authors of these reviews are advised to use the hierarchical summary receiver...

  10. Final Technical Report: Increasing Prediction Accuracy.

    Energy Technology Data Exchange (ETDEWEB)

    King, Bruce Hardison [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Hansen, Clifford [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Stein, Joshua [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2015-12-01

    PV performance models are used to quantify the value of PV plants in a given location. They combine the performance characteristics of the system, the measured or predicted irradiance and weather at a site, and the system configuration and design into a prediction of the amount of energy that will be produced by a PV system. These predictions must be as accurate as possible in order for finance charges to be minimized. Higher accuracy equals lower project risk. The Increasing Prediction Accuracy project at Sandia focuses on quantifying and reducing uncertainties in PV system performance models.

  11. The concept of spectral accuracy for MS.

    Science.gov (United States)

    Wang, Yongdong; Gu, Ming

    2010-09-01

    Though MS has always appeared to be quite different from spectroscopy to analytical chemists who are familiar with both, a careful examination from historical and theoretical perspectives reveals a striking similarity between the two. With the introduction of spectral accuracy, a companion concept to the better known mass accuracy, new capabilities previously thought unfeasible can now be enabled for MS. (To listen to a podcast about this article, please go to the Analytical Chemistry multimedia page at pubs.acs.org/page/ancham/audio/index.html .).

  12. ACCURACY ANALYSIS OF KINECT DEPTH DATA

    Directory of Open Access Journals (Sweden)

    K. Khoshelham

    2012-09-01

    Full Text Available This paper presents an investigation of the geometric quality of depth data obtained by the Kinect sensor. Based on the mathematical model of depth measurement by the sensor a theoretical error analysis is presented, which provides an insight into the factors influencing the accuracy of the data. Experimental results show that the random error of depth measurement increases with increasing distance to the sensor, and ranges from a few millimetres up to about 4 cm at the maximum range of the sensor. The accuracy of the data is also found to be influenced by the low resolution of the depth measurements.

  13. Revolutionizing radiographic diagnostic accuracy in periodontics

    Directory of Open Access Journals (Sweden)

    Brijesh Sharma

    2016-01-01

    Full Text Available Effective diagnostic accuracy has in some way been the missing link between periodontal diagnosis and treatment. Most of the clinicians rely on the conventional two-dimensional (2D radiographs. But being a 2D image, it has its own limitations. 2D images at times can give an incomplete picture about the severity or type of disease and can further affect the treatment plan. Cone beam computed tomography (CBCT has a better potential for detecting periodontal bone defects with accuracy. The purpose here is to describe how CBCT imaging is beneficial in accurate diagnosis and will lead to a precise treatment plan.

  14. The quantum theory of measurement

    CERN Document Server

    Busch, Paul; Mittelstaedt, Peter

    1996-01-01

    The amazing accuracy in verifying quantum effects experimentally has recently renewed interest in quantum mechanical measurement theory. In this book the authors give within the Hilbert space formulation of quantum mechanics a systematic exposition of the quantum theory of measurement. Their approach includes the concepts of unsharp objectification and of nonunitary transformations needed for a unifying description of various detailed investigations. The book addresses advanced students and researchers in physics and philosophy of science. In this second edition Chaps. II-IV have been substantially rewritten. In particular, an insolubility theorem for the objectification problem has been formulated in full generality, which includes unsharp object observables and unsharp pointers.

  15. Moliere multiple scattering theory revisited

    CERN Document Server

    Tarasov, Alexander

    2012-01-01

    We have received the rigorous relations between the screening parameters of the Moliere multiple scattering theory, instead of the approximate one obtained in the original paper by Moliere. We also calculated the relative Coulomb corrections to the first Born screening angle in the range from Z=4 to Z=82, and showed that their maximum values comprise the order of 40 percent. Additionally, we evaluated absolute and relative accuracies of the Moliere theory in determining the screening angle and have concluded that for Z~80 they are about 20, and 34 percents, respectively.

  16. Continuity theory

    CERN Document Server

    Nel, Louis

    2016-01-01

    This book presents a detailed, self-contained theory of continuous mappings. It is mainly addressed to students who have already studied these mappings in the setting of metric spaces, as well as multidimensional differential calculus. The needed background facts about sets, metric spaces and linear algebra are developed in detail, so as to provide a seamless transition between students' previous studies and new material. In view of its many novel features, this book will be of interest also to mature readers who have studied continuous mappings from the subject's classical texts and wish to become acquainted with a new approach. The theory of continuous mappings serves as infrastructure for more specialized mathematical theories like differential equations, integral equations, operator theory, dynamical systems, global analysis, topological groups, topological rings and many more. In light of the centrality of the topic, a book of this kind fits a variety of applications, especially those that contribute to ...

  17. Model theory

    CERN Document Server

    Hodges, Wilfrid

    1993-01-01

    An up-to-date and integrated introduction to model theory, designed to be used for graduate courses (for students who are familiar with first-order logic), and as a reference for more experienced logicians and mathematicians.

  18. Activity Theory.

    Science.gov (United States)

    Koschmann, Timothy; Roschelle, Jeremy; Nardi, Bonnie A.

    1998-01-01

    Includes three articles that discuss activity theory, based on "Context and Consciousness." Topics include human-computer interaction; computer interfaces; hierarchical structuring; mediation; contradictions and development; failure analysis; and designing educational technology. (LRW)

  19. The generalized radon transform: Sampling, accuracy and memoryconsiderations

    Energy Technology Data Exchange (ETDEWEB)

    Luengo Hendriks, Cris L.; van Ginkel, Michael; Verbeek, Piet W.; van Vliet, Lucas J.

    2004-09-23

    The generalized Radon (or Hough) transform is a well-known tool for detecting parameterized shapes in an image. The Radon transform is a mapping between the image space and a parameter space. The coordinates of a point in the latter correspond to the parameters of a shape in the image. The amplitude at that point corresponds to the amount of evidence for that shape. In this paper we discuss three important aspects of the Radon transform. The first aspect is discretization. Using concepts from sampling theory we derive a set of sampling criteria for the generalized Radon transform. The second aspect is accuracy. For the specific case of the Radon transform for spheres, we examine how well the location of the maxima matches the true parameters. We derive a correction term to reduce the bias in the estimated radii. The third aspect concerns a projection-based algorithm to reduce memory requirements.

  20. Researching the technology of high-accuracy camshaft measurement

    Science.gov (United States)

    Chen, Wei; Chen, Yong-Le; Wang, Hong; Liao, Hai-Yang

    1996-10-01

    This paper states the cam's data processing algorithm in detail in high accurate camshaft measurement system. It contains: 1) using minimum error of curve symmetry to seek the center position of the key slot; 2) Calculating the minimum error by cam's curve in theory to search top area; 3) According to cam's tolerance E(i) function and minimum angle error at cam top, seeking the best position of cam top and getting the best angle value and error curve. The algorithm is suitable for measuring all kinds of symmetry or asymmetry cam, and plain push-rod or spherical push-rod cam, for example, bus camshaft, car camshaft, motor camshaft, etc. Using the algorithm, high accuracy measurement can be achieved.

  1. Graph theory

    CERN Document Server

    Gould, Ronald

    2012-01-01

    This introduction to graph theory focuses on well-established topics, covering primary techniques and including both algorithmic and theoretical problems. The algorithms are presented with a minimum of advanced data structures and programming details. This thoroughly corrected 1988 edition provides insights to computer scientists as well as advanced undergraduates and graduate students of topology, algebra, and matrix theory. Fundamental concepts and notation and elementary properties and operations are the first subjects, followed by examinations of paths and searching, trees, and networks. S

  2. Matrix Theory

    Science.gov (United States)

    1988-06-30

    MATRICES . The monograph Nonnegative Matrices [6] is an advanced book on all aspect of the theory of nonnegative matrices and...and on inverse eigenvalue problems for nonnegative matrices . The work explores some of the most recent developments in the theory of nonnegative...k -1, t0 . Define the associated polynomial of type <z>: t t-t 2 t-t 3 t-tk_ 1,X - x - x . . .X- where t = tk . The

  3. Modeling Linkage Disequilibrium Increases Accuracy of Polygenic Risk Scores.

    Science.gov (United States)

    Vilhjálmsson, Bjarni J; Yang, Jian; Finucane, Hilary K; Gusev, Alexander; Lindström, Sara; Ripke, Stephan; Genovese, Giulio; Loh, Po-Ru; Bhatia, Gaurav; Do, Ron; Hayeck, Tristan; Won, Hong-Hee; Kathiresan, Sekar; Pato, Michele; Pato, Carlos; Tamimi, Rulla; Stahl, Eli; Zaitlen, Noah; Pasaniuc, Bogdan; Belbin, Gillian; Kenny, Eimear E; Schierup, Mikkel H; De Jager, Philip; Patsopoulos, Nikolaos A; McCarroll, Steve; Daly, Mark; Purcell, Shaun; Chasman, Daniel; Neale, Benjamin; Goddard, Michael; Visscher, Peter M; Kraft, Peter; Patterson, Nick; Price, Alkes L

    2015-10-01

    Polygenic risk scores have shown great promise in predicting complex disease risk and will become more accurate as training sample sizes increase. The standard approach for calculating risk scores involves linkage disequilibrium (LD)-based marker pruning and applying a p value threshold to association statistics, but this discards information and can reduce predictive accuracy. We introduce LDpred, a method that infers the posterior mean effect size of each marker by using a prior on effect sizes and LD information from an external reference panel. Theory and simulations show that LDpred outperforms the approach of pruning followed by thresholding, particularly at large sample sizes. Accordingly, predicted R(2) increased from 20.1% to 25.3% in a large schizophrenia dataset and from 9.8% to 12.0% in a large multiple sclerosis dataset. A similar relative improvement in accuracy was observed for three additional large disease datasets and for non-European schizophrenia samples. The advantage of LDpred over existing methods will grow as sample sizes increase. Copyright © 2015 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

  4. Influence of chamber misalignment on cased telescoped (CT) ammunition accuracy

    Institute of Scientific and Technical Information of China (English)

    D. CORRIVEAU; C. FLORIN PETRE

    2016-01-01

    As part of a research program, it was desired to better understand the impact of the rotating chamber alignment with the barrel throat on the precision and accuracy of a novel cased telescoped (CT) ammunition firing rifle. In order to perform the study, a baseline CT ammunition chamber which was concentric with a Mann barrel bore was manufactured. Additionally, six chambers were manufactured with an offset relative to the barrel bore. These chambers were used to simulate a misaligned chamber relative to the bore axis. Precision and accuracy tests were then performed at 200 m in an indoor range under controlled conditions. For this project, 5.56 mm CT ammunition was used. As the chamber axis offset relative to the gun bore was increased, the mean point of impact was displaced away from the target center. The shift in the impact location is explained by the presence of in-bore yaw which results in lateral throw-off and aerodynamic jump components. The linear theory of ballistics is used to establish a relationship between the chamber misalignment and the resulting projectile mean point of impact for a rifle developed to fire CT ammunition. This relationship allows for the prediction of the mean point of impact given a chamber misalignment.

  5. Influence of chamber misalignment on cased telescoped (CT ammunition accuracy

    Directory of Open Access Journals (Sweden)

    D. Corriveau

    2016-04-01

    Full Text Available As part of a research program, it was desired to better understand the impact of the rotating chamber alignment with the barrel throat on the precision and accuracy of a novel cased telescoped (CT ammunition firing rifle. In order to perform the study, a baseline CT ammunition chamber which was concentric with a Mann barrel bore was manufactured. Additionally, six chambers were manufactured with an offset relative to the barrel bore. These chambers were used to simulate a misaligned chamber relative to the bore axis. Precision and accuracy tests were then performed at 200 m in an indoor range under controlled conditions. For this project, 5.56 mm CT ammunition was used. As the chamber axis offset relative to the gun bore was increased, the mean point of impact was displaced away from the target center. The shift in the impact location is explained by the presence of in-bore yaw which results in lateral throw-off and aerodynamic jump components. The linear theory of ballistics is used to establish a relationship between the chamber misalignment and the resulting projectile mean point of impact for a rifle developed to fire CT ammunition. This relationship allows for the prediction of the mean point of impact given a chamber misalignment.

  6. Modeling Linkage Disequilibrium Increases Accuracy of Polygenic Risk Scores

    Science.gov (United States)

    Vilhjálmsson, Bjarni J.; Yang, Jian; Finucane, Hilary K.; Gusev, Alexander; Lindström, Sara; Ripke, Stephan; Genovese, Giulio; Loh, Po-Ru; Bhatia, Gaurav; Do, Ron; Hayeck, Tristan; Won, Hong-Hee; Ripke, Stephan; Neale, Benjamin M.; Corvin, Aiden; Walters, James T.R.; Farh, Kai-How; Holmans, Peter A.; Lee, Phil; Bulik-Sullivan, Brendan; Collier, David A.; Huang, Hailiang; Pers, Tune H.; Agartz, Ingrid; Agerbo, Esben; Albus, Margot; Alexander, Madeline; Amin, Farooq; Bacanu, Silviu A.; Begemann, Martin; Belliveau, Richard A.; Bene, Judit; Bergen, Sarah E.; Bevilacqua, Elizabeth; Bigdeli, Tim B.; Black, Donald W.; Bruggeman, Richard; Buccola, Nancy G.; Buckner, Randy L.; Byerley, William; Cahn, Wiepke; Cai, Guiqing; Campion, Dominique; Cantor, Rita M.; Carr, Vaughan J.; Carrera, Noa; Catts, Stanley V.; Chambert, Kimberly D.; Chan, Raymond C.K.; Chen, Ronald Y.L.; Chen, Eric Y.H.; Cheng, Wei; Cheung, Eric F.C.; Chong, Siow Ann; Cloninger, C. Robert; Cohen, David; Cohen, Nadine; Cormican, Paul; Craddock, Nick; Crowley, James J.; Curtis, David; Davidson, Michael; Davis, Kenneth L.; Degenhardt, Franziska; Del Favero, Jurgen; DeLisi, Lynn E.; Demontis, Ditte; Dikeos, Dimitris; Dinan, Timothy; Djurovic, Srdjan; Donohoe, Gary; Drapeau, Elodie; Duan, Jubao; Dudbridge, Frank; Durmishi, Naser; Eichhammer, Peter; Eriksson, Johan; Escott-Price, Valentina; Essioux, Laurent; Fanous, Ayman H.; Farrell, Martilias S.; Frank, Josef; Franke, Lude; Freedman, Robert; Freimer, Nelson B.; Friedl, Marion; Friedman, Joseph I.; Fromer, Menachem; Genovese, Giulio; Georgieva, Lyudmila; Gershon, Elliot S.; Giegling, Ina; Giusti-Rodrguez, Paola; Godard, Stephanie; Goldstein, Jacqueline I.; Golimbet, Vera; Gopal, Srihari; Gratten, Jacob; Grove, Jakob; de Haan, Lieuwe; Hammer, Christian; Hamshere, Marian L.; Hansen, Mark; Hansen, Thomas; Haroutunian, Vahram; Hartmann, Annette M.; Henskens, Frans A.; Herms, Stefan; Hirschhorn, Joel N.; Hoffmann, Per; Hofman, Andrea; Hollegaard, Mads V.; Hougaard, David M.; Ikeda, Masashi; Joa, Inge; Julia, Antonio; Kahn, Rene S.; Kalaydjieva, Luba; Karachanak-Yankova, Sena; Karjalainen, Juha; Kavanagh, David; Keller, Matthew C.; Kelly, Brian J.; Kennedy, James L.; Khrunin, Andrey; Kim, Yunjung; Klovins, Janis; Knowles, James A.; Konte, Bettina; Kucinskas, Vaidutis; Kucinskiene, Zita Ausrele; Kuzelova-Ptackova, Hana; Kahler, Anna K.; Laurent, Claudine; Keong, Jimmy Lee Chee; Lee, S. Hong; Legge, Sophie E.; Lerer, Bernard; Li, Miaoxin; Li, Tao; Liang, Kung-Yee; Lieberman, Jeffrey; Limborska, Svetlana; Loughland, Carmel M.; Lubinski, Jan; Lnnqvist, Jouko; Macek, Milan; Magnusson, Patrik K.E.; Maher, Brion S.; Maier, Wolfgang; Mallet, Jacques; Marsal, Sara; Mattheisen, Manuel; Mattingsdal, Morten; McCarley, Robert W.; McDonald, Colm; McIntosh, Andrew M.; Meier, Sandra; Meijer, Carin J.; Melegh, Bela; Melle, Ingrid; Mesholam-Gately, Raquelle I.; Metspalu, Andres; Michie, Patricia T.; Milani, Lili; Milanova, Vihra; Mokrab, Younes; Morris, Derek W.; Mors, Ole; Mortensen, Preben B.; Murphy, Kieran C.; Murray, Robin M.; Myin-Germeys, Inez; Mller-Myhsok, Bertram; Nelis, Mari; Nenadic, Igor; Nertney, Deborah A.; Nestadt, Gerald; Nicodemus, Kristin K.; Nikitina-Zake, Liene; Nisenbaum, Laura; Nordin, Annelie; O’Callaghan, Eadbhard; O’Dushlaine, Colm; O’Neill, F. Anthony; Oh, Sang-Yun; Olincy, Ann; Olsen, Line; Van Os, Jim; Pantelis, Christos; Papadimitriou, George N.; Papiol, Sergi; Parkhomenko, Elena; Pato, Michele T.; Paunio, Tiina; Pejovic-Milovancevic, Milica; Perkins, Diana O.; Pietilinen, Olli; Pimm, Jonathan; Pocklington, Andrew J.; Powell, John; Price, Alkes; Pulver, Ann E.; Purcell, Shaun M.; Quested, Digby; Rasmussen, Henrik B.; Reichenberg, Abraham; Reimers, Mark A.; Richards, Alexander L.; Roffman, Joshua L.; Roussos, Panos; Ruderfer, Douglas M.; Salomaa, Veikko; Sanders, Alan R.; Schall, Ulrich; Schubert, Christian R.; Schulze, Thomas G.; Schwab, Sibylle G.; Scolnick, Edward M.; Scott, Rodney J.; Seidman, Larry J.; Shi, Jianxin; Sigurdsson, Engilbert; Silagadze, Teimuraz; Silverman, Jeremy M.; Sim, Kang; Slominsky, Petr; Smoller, Jordan W.; So, Hon-Cheong; Spencer, Chris C.A.; Stahl, Eli A.; Stefansson, Hreinn; Steinberg, Stacy; Stogmann, Elisabeth; Straub, Richard E.; Strengman, Eric; Strohmaier, Jana; Stroup, T. Scott; Subramaniam, Mythily; Suvisaari, Jaana; Svrakic, Dragan M.; Szatkiewicz, Jin P.; Sderman, Erik; Thirumalai, Srinivas; Toncheva, Draga; Tooney, Paul A.; Tosato, Sarah; Veijola, Juha; Waddington, John; Walsh, Dermot; Wang, Dai; Wang, Qiang; Webb, Bradley T.; Weiser, Mark; Wildenauer, Dieter B.; Williams, Nigel M.; Williams, Stephanie; Witt, Stephanie H.; Wolen, Aaron R.; Wong, Emily H.M.; Wormley, Brandon K.; Wu, Jing Qin; Xi, Hualin Simon; Zai, Clement C.; Zheng, Xuebin; Zimprich, Fritz; Wray, Naomi R.; Stefansson, Kari; Visscher, Peter M.; Adolfsson, Rolf; Andreassen, Ole A.; Blackwood, Douglas H.R.; Bramon, Elvira; Buxbaum, Joseph D.; Børglum, Anders D.; Cichon, Sven; Darvasi, Ariel; Domenici, Enrico; Ehrenreich, Hannelore; Esko, Tonu; Gejman, Pablo V.; Gill, Michael; Gurling, Hugh; Hultman, Christina M.; Iwata, Nakao; Jablensky, Assen V.; Jonsson, Erik G.; Kendler, Kenneth S.; Kirov, George; Knight, Jo; Lencz, Todd; Levinson, Douglas F.; Li, Qingqin S.; Liu, Jianjun; Malhotra, Anil K.; McCarroll, Steven A.; McQuillin, Andrew; Moran, Jennifer L.; Mortensen, Preben B.; Mowry, Bryan J.; Nthen, Markus M.; Ophoff, Roel A.; Owen, Michael J.; Palotie, Aarno; Pato, Carlos N.; Petryshen, Tracey L.; Posthuma, Danielle; Rietschel, Marcella; Riley, Brien P.; Rujescu, Dan; Sham, Pak C.; Sklar, Pamela; St. Clair, David; Weinberger, Daniel R.; Wendland, Jens R.; Werge, Thomas; Daly, Mark J.; Sullivan, Patrick F.; O’Donovan, Michael C.; Kraft, Peter; Hunter, David J.; Adank, Muriel; Ahsan, Habibul; Aittomäki, Kristiina; Baglietto, Laura; Berndt, Sonja; Blomquist, Carl; Canzian, Federico; Chang-Claude, Jenny; Chanock, Stephen J.; Crisponi, Laura; Czene, Kamila; Dahmen, Norbert; Silva, Isabel dos Santos; Easton, Douglas; Eliassen, A. Heather; Figueroa, Jonine; Fletcher, Olivia; Garcia-Closas, Montserrat; Gaudet, Mia M.; Gibson, Lorna; Haiman, Christopher A.; Hall, Per; Hazra, Aditi; Hein, Rebecca; Henderson, Brian E.; Hofman, Albert; Hopper, John L.; Irwanto, Astrid; Johansson, Mattias; Kaaks, Rudolf; Kibriya, Muhammad G.; Lichtner, Peter; Lindström, Sara; Liu, Jianjun; Lund, Eiliv; Makalic, Enes; Meindl, Alfons; Meijers-Heijboer, Hanne; Müller-Myhsok, Bertram; Muranen, Taru A.; Nevanlinna, Heli; Peeters, Petra H.; Peto, Julian; Prentice, Ross L.; Rahman, Nazneen; Sánchez, María José; Schmidt, Daniel F.; Schmutzler, Rita K.; Southey, Melissa C.; Tamimi, Rulla; Travis, Ruth; Turnbull, Clare; Uitterlinden, Andre G.; van der Luijt, Rob B.; Waisfisz, Quinten; Wang, Zhaoming; Whittemore, Alice S.; Yang, Rose; Zheng, Wei; Kathiresan, Sekar; Pato, Michele; Pato, Carlos; Tamimi, Rulla; Stahl, Eli; Zaitlen, Noah; Pasaniuc, Bogdan; Belbin, Gillian; Kenny, Eimear E.; Schierup, Mikkel H.; De Jager, Philip; Patsopoulos, Nikolaos A.; McCarroll, Steve; Daly, Mark; Purcell, Shaun; Chasman, Daniel; Neale, Benjamin; Goddard, Michael; Visscher, Peter M.; Kraft, Peter; Patterson, Nick; Price, Alkes L.

    2015-01-01

    Polygenic risk scores have shown great promise in predicting complex disease risk and will become more accurate as training sample sizes increase. The standard approach for calculating risk scores involves linkage disequilibrium (LD)-based marker pruning and applying a p value threshold to association statistics, but this discards information and can reduce predictive accuracy. We introduce LDpred, a method that infers the posterior mean effect size of each marker by using a prior on effect sizes and LD information from an external reference panel. Theory and simulations show that LDpred outperforms the approach of pruning followed by thresholding, particularly at large sample sizes. Accordingly, predicted R2 increased from 20.1% to 25.3% in a large schizophrenia dataset and from 9.8% to 12.0% in a large multiple sclerosis dataset. A similar relative improvement in accuracy was observed for three additional large disease datasets and for non-European schizophrenia samples. The advantage of LDpred over existing methods will grow as sample sizes increase. PMID:26430803

  7. Accuracy of marker-assisted selection with auxiliary traits

    Indian Academy of Sciences (India)

    P Narain

    2003-09-01

    Genetic information on molecular markers is increasingly being used in plant and animal improvement programmes particularly as indirect means to improve a metric trait by selection either on an individual basis or on the basis of an index incorporating such information. This paper examines the utility of an index of selection that not only combines phenotypic and molecular information on the trait under improvement but also combines similar information on one or more auxiliary traits. The accuracy of such a selection procedure has been theoretically studied for sufficiently large populations so that the effects of detected quantitative trait loci can be perfectly estimated. The theory is illustrated numerically by considering one auxiliary trait. It is shown that the use of an auxiliary trait improves the selection accuracy; and, hence, the relative efficiency of index selection compared to individual selection which is based on the same intensity of selection. This is particularly so for higher magnitudes of residual genetic correlation and environmental correlation having opposite signs, lower values of the proportion of genetic variation in the main trait associated with the markers, negligible proportion of genetic variation in the auxiliary trait associated with the markers, and lower values of the heritability of the main trait but higher values of the heritability of the auxiliary trait.

  8. Task Speed and Accuracy Decrease When Multitasking

    Science.gov (United States)

    Lin, Lin; Cockerham, Deborah; Chang, Zhengsi; Natividad, Gloria

    2016-01-01

    As new technologies increase the opportunities for multitasking, the need to understand human capacities for multitasking continues to grow stronger. Is multitasking helping us to be more efficient? This study investigated the multitasking abilities of 168 participants, ages 6-72, by measuring their task accuracy and completion time when they…

  9. Accuracy in analyses of biological materials

    Energy Technology Data Exchange (ETDEWEB)

    Marchandise, H.

    1987-04-01

    The work of the Community Bureau of Reference is outlined, special emphasis being laid on the problem of accuracy. Examples are described for trace elements in milk, Pb and Cd in blood, Ca in serum, cortisol in serum, and aflatoxin in milk.

  10. Accuracy assessment of an industrial actuator

    DEFF Research Database (Denmark)

    Dalla Costa, Giuseppe; Genta, Gianfranco; Barbato, Giulio

    2016-01-01

    A commercial linear actuator equipped with a 0.1 μm resolution encoder was used as a contact displacement sensor with adjustable force. The accuracy of the position reading of the actuator was evaluated from experimental data taking into account the uncertainty contributions. The tests consisted ...

  11. Adult Metacomprehension: Judgment Processes and Accuracy Constraints

    Science.gov (United States)

    Zhao, Qin; Linderholm, Tracy

    2008-01-01

    The objective of this paper is to review and synthesize two interrelated topics in the adult metacomprehension literature: the bases of metacomprehension judgment and the constraints on metacomprehension accuracy. Our review shows that adult readers base their metacomprehension judgments on different types of information, including experiences…

  12. Accuracy Of Stereometry In Assessing Orthognathic Surgery

    Science.gov (United States)

    King, Geoffrey E.; Bays, R. A.

    1983-07-01

    An X-ray stereometric technique has been developed for the determination of 3-dimensional coordinates of spherical metallic markers previously implanted in monkey skulls. The accuracy of the technique is better than 0.5mm. and uses readily available demountable X-ray equipment. The technique is used to study the effects and stability of experimental orthognathic surgery.

  13. Task Speed and Accuracy Decrease When Multitasking

    Science.gov (United States)

    Lin, Lin; Cockerham, Deborah; Chang, Zhengsi; Natividad, Gloria

    2016-01-01

    As new technologies increase the opportunities for multitasking, the need to understand human capacities for multitasking continues to grow stronger. Is multitasking helping us to be more efficient? This study investigated the multitasking abilities of 168 participants, ages 6-72, by measuring their task accuracy and completion time when they…

  14. On the Accuracy of Galileo's Observations

    CERN Document Server

    Graney, Christopher M

    2008-01-01

    Galileo Galilei had sufficient skill as an observer and instrument builder to be able to measure the positions and apparent sizes of objects seen through his telescopes to an accuracy of 2" or better. However, Galileo had no knowledge of wave optics, so when he was measuring stellar apparent sizes he was producing very accurate measurements of diffraction artifacts and not physical bodies.

  15. Accuracy assessment with complex sampling designs

    Science.gov (United States)

    Raymond L. Czaplewski

    2010-01-01

    A reliable accuracy assessment of remotely sensed geospatial data requires a sufficiently large probability sample of expensive reference data. Complex sampling designs reduce cost or increase precision, especially with regional, continental and global projects. The General Restriction (GR) Estimator and the Recursive Restriction (RR) Estimator separate a complex...

  16. Accuracy of References in Five Entomology Journals.

    Science.gov (United States)

    Kristof, Cynthia

    ln this paper, the bibliographical references in five core entomology journals are examined for citation accuracy in order to determine if the error rates are similar. Every reference printed in each journal's first issue of 1992 was examined, and these were compared to the original (cited) publications, if possible, in order to determine the…

  17. High accuracy FIONA-AFM hybrid imaging.

    Science.gov (United States)

    Fronczek, D N; Quammen, C; Wang, H; Kisker, C; Superfine, R; Taylor, R; Erie, D A; Tessmer, I

    2011-04-01

    Multi-protein complexes are ubiquitous and play essential roles in many biological mechanisms. Single molecule imaging techniques such as electron microscopy (EM) and atomic force microscopy (AFM) are powerful methods for characterizing the structural properties of multi-protein and multi-protein-DNA complexes. However, a significant limitation to these techniques is the ability to distinguish different proteins from one another. Here, we combine high resolution fluorescence microscopy and AFM (FIONA-AFM) to allow the identification of different proteins in such complexes. Using quantum dots as fiducial markers in addition to fluorescently labeled proteins, we are able to align fluorescence and AFM information to ≥8nm accuracy. This accuracy is sufficient to identify individual fluorescently labeled proteins in most multi-protein complexes. We investigate the limitations of localization precision and accuracy in fluorescence and AFM images separately and their effects on the overall registration accuracy of FIONA-AFM hybrid images. This combination of the two orthogonal techniques (FIONA and AFM) opens a wide spectrum of possible applications to the study of protein interactions, because AFM can yield high resolution (5-10nm) information about the conformational properties of multi-protein complexes and the fluorescence can indicate spatial relationships of the proteins in the complexes.

  18. Observed Consultation: Confidence and Accuracy of Assessors

    Science.gov (United States)

    Tweed, Mike; Ingham, Christopher

    2010-01-01

    Judgments made by the assessors observing consultations are widely used in the assessment of medical students. The aim of this research was to study judgment accuracy and confidence and the relationship between these. Assessors watched recordings of consultations, scoring the students on: a checklist of items; attributes of consultation; a…

  19. Vowel Space Characteristics and Vowel Identification Accuracy

    Science.gov (United States)

    Neel, Amy T.

    2008-01-01

    Purpose: To examine the relation between vowel production characteristics and intelligibility. Method: Acoustic characteristics of 10 vowels produced by 45 men and 48 women from the J. M. Hillenbrand, L. A. Getty, M. J. Clark, and K. Wheeler (1995) study were examined and compared with identification accuracy. Global (mean f0, F1, and F2;…

  20. ACCURACY AND FLUENCY IN COMMUNICATIVE LANGUAGE TEACHING

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Ⅰ. Introduction In English language teaching, at whatever level, teachers feel it very important to focus on accuracy and fluency in a pedagogic way. It is now widely accepted that neither of them should be focused on alone all the way through the teaching process. From our teaching experience, we can see that to some extent this is true.

  1. Observed Consultation: Confidence and Accuracy of Assessors

    Science.gov (United States)

    Tweed, Mike; Ingham, Christopher

    2010-01-01

    Judgments made by the assessors observing consultations are widely used in the assessment of medical students. The aim of this research was to study judgment accuracy and confidence and the relationship between these. Assessors watched recordings of consultations, scoring the students on: a checklist of items; attributes of consultation; a…

  2. The Accuracy of Three Developmental Screening Tests.

    Science.gov (United States)

    Glascoe, Frances Page; Byrne, Karen E.

    1993-01-01

    The accuracy of 3 developmental screening tests administered to 89 young children was compared. The Battelle Developmental Inventory Screening Test was more accurate than the Academic Scale of the Developmental Profile-II and the Denver-II, identifying correctly 72% of children with difficulties and 76% of children without diagnoses. (Author/JDD)

  3. High Accuracy Transistor Compact Model Calibrations

    Energy Technology Data Exchange (ETDEWEB)

    Hembree, Charles E. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Mar, Alan [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Robertson, Perry J. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

    2015-09-01

    Typically, transistors are modeled by the application of calibrated nominal and range models. These models consists of differing parameter values that describe the location and the upper and lower limits of a distribution of some transistor characteristic such as current capacity. Correspond- ingly, when using this approach, high degrees of accuracy of the transistor models are not expected since the set of models is a surrogate for a statistical description of the devices. The use of these types of models describes expected performances considering the extremes of process or transistor deviations. In contrast, circuits that have very stringent accuracy requirements require modeling techniques with higher accuracy. Since these accurate models have low error in transistor descriptions, these models can be used to describe part to part variations as well as an accurate description of a single circuit instance. Thus, models that meet these stipulations also enable the calculation of quantifi- cation of margins with respect to a functional threshold and uncertainties in these margins. Given this need, new model high accuracy calibration techniques for bipolar junction transis- tors have been developed and are described in this report.

  4. Seasonal Effects on GPS PPP Accuracy

    Science.gov (United States)

    Saracoglu, Aziz; Ugur Sanli, D.

    2016-04-01

    GPS Precise Point Positioning (PPP) is now routinely used in many geophysical applications. Static positioning and 24 h data are requested for high precision results however real life situations do not always let us collect 24 h data. Thus repeated GPS surveys of 8-10 h observation sessions are still used by some research groups. Positioning solutions from shorter data spans are subject to various systematic influences, and the positioning quality as well as the estimated velocity is degraded. Researchers pay attention to the accuracy of GPS positions and of the estimated velocities derived from short observation sessions. Recently some research groups turned their attention to the study of seasonal effects (i.e. meteorological seasons) on GPS solutions. Up to now usually regional studies have been reported. In this study, we adopt a global approach and study the various seasonal effects (including the effect of the annual signal) on GPS solutions produced from short observation sessions. We use the PPP module of the NASA/JPL's GIPSY/OASIS II software and globally distributed GPS stations' data of the International GNSS Service. Accuracy studies previously performed with 10-30 consecutive days of continuous data. Here, data from each month of a year, incorporating two years in succession, is used in the analysis. Our major conclusion is that a reformulation for the GPS positioning accuracy is necessary when taking into account the seasonal effects, and typical one term accuracy formulation is expanded to a two-term one.

  5. Accuracy assessment of an industrial actuator

    DEFF Research Database (Denmark)

    Dalla Costa, Giuseppe; Genta, Gianfranco; Barbato, Giulio

    2016-01-01

    of length measurements of grade 0 steel gauge blocks. Measurements with different values of contact force were performed to assess its influence. A statistical analysis of the experimental data was performed to support the accuracy assessment. Systematic effects were identified and corrected. An expanded...

  6. Influencia de la lateralidad dominante de la jugadora en puesto específico de base en el juego de ataque en Liga Femenina 2 [Laterality dominance of female point guard influences in the offensive patterns in LF2

    Directory of Open Access Journals (Sweden)

    Javier García Rubio

    2010-03-01

    Full Text Available Resumen La lateralidad de la jugadora con el rol de base puede ser sólo una característica individual, o bien un factor influyente en el juego de su equipo, y por tanto, una herramienta a considerar por  parte del equipo rival. El trabajo de investigación se centra en la necesidad de reflejar si la lateralidad de una jugadora con rol de base en baloncesto, al iniciar la acción de juego (bote o pase influye de manera determinante en la toma de decisiones. El contexto de trabajo utilizado es la segunda categoría de baloncesto femenino nacional, Liga Femenina 2. En la observación han participado varios equipos de dicha categoría, con total de 10 partidos analizados y un total de 170 situaciones de juego analizadas (N=170. Para establecer las relaciones entre las variables se utilizó el Coeficiente de Contingencia. Los resultados muestran una relación estadísticamente significativa de la lateralidad de la base y el lado del campo en el que se empieza a jugar (c2(1, N=170 = 4.789, pPalabras clave: Baloncesto, Lateralidad, Base, Análisis de juego.   AbstractLaterality of the point-guard can be an individual characteristic, or in the other hand, an important factor in the offensive patterns of the team. In this way, it will be a useful information for the other team.  This research has focused in the laterality of the point guard, and it influences in the decision making. The League studied was the second female Spanish basketball league, LF2. 10 matches were observed and 170 game situations analyzed (N=170. Crosstabs Command and the Contingency Coefficient were used to establish the relationship between variables. The results shows a significant relationship between the laterality of the point guard and the side of the field where the attack begin (c2(1, N=170 = 4.789, pKey words:  Basketball, laterality, point guard, game analysis.

  7. Influencia de la lateralidad dominante de la jugadora en puesto específico de base en el juego de ataque en Liga Femenina 2 [Laterality dominance of female point guard influences in the offensive patterns in LF2

    Directory of Open Access Journals (Sweden)

    Alejandra Manzano Rivera

    2010-03-01

    Full Text Available Resumen La lateralidad de la jugadora con el rol de base puede ser sólo una característica individual, o bien un factor influyente en el juego de su equipo, y por tanto, una herramienta a considerar por  parte del equipo rival. El trabajo de investigación se centra en la necesidad de reflejar si la lateralidad de una jugadora con rol de base en baloncesto, al iniciar la acción de juego (bote o pase influye de manera determinante en la toma de decisiones. El contexto de trabajo utilizado es la segunda categoría de baloncesto femenino nacional, Liga Femenina 2. En la observación han participado varios equipos de dicha categoría, con total de 10 partidos analizados y un total de 170 situaciones de juego analizadas (N=170. Para establecer las relaciones entre las variables se utilizó el Coeficiente de Contingencia. Los resultados muestran una relación estadísticamente significativa de la lateralidad de la base y el lado del campo en el que se empieza a jugar (c2(1, N=170 = 4.789, pPalabras clave: Baloncesto, Lateralidad, Base, Análisis de juego.   AbstractLaterality of the point-guard can be an individual characteristic, or in the other hand, an important factor in the offensive patterns of the team. In this way, it will be a useful information for the other team.  This research has focused in the laterality of the point guard, and it influences in the decision making. The League studied was the second female Spanish basketball league, LF2. 10 matches were observed and 170 game situations analyzed (N=170. Crosstabs Command and the Contingency Coefficient were used to establish the relationship between variables. The results shows a significant relationship between the laterality of the point guard and the side of the field where the attack begin (c2(1, N=170 = 4.789, pKey words:  Basketball, laterality, point guard, game analysis.

  8. Estudo da liga alumínio-zinco como filtração alternativa em aparelhos de raios X odontológicos Study of the aluminum-zinc alloy as an alternative means of filtration in dental X-ray devices

    Directory of Open Access Journals (Sweden)

    Claudia Fátima Silva HAITER

    2002-03-01

    Full Text Available O objetivo neste trabalho foi avaliar os efeitos da filtração alternativa da liga alumínio-zinco em aparelhos de raios X odontológicos, em relação ao espectro de energia dos feixes de raios X, a taxa de kerma no ar, o índice de contraste nas radiografias obtidas e a qualidade das imagens radiográficas. Este estudo foi realizado comparando-se o filtro convencional de alumínio com várias espessuras do filtro de liga alumínio-zinco, em diferentes porcentagens do elemento zinco na liga (2%, 3%, 4% e 5%. Foi utilizado um aparelho de raios X odontológico convencional, operando com 60 kVp e 70 kVp, e filmes radiográficos dos grupos D e E de sensibilidade. Foram realizadas radiografias de um "phantom" e de uma escala de densidade de alumínio. Os resultados mostraram que o uso dos filtros de liga Al-Zn resultou em um não-endurecimento dos feixes. A taxa de kerma no ar diminuiu em até 18,53%, sem alteração no contraste das radiografias e a qualidade das imagens teve uma boa aceitação pelos examinadores. A análise dos resultados nos levou a concluir que o filtro de liga Al-Zn 2%, com 1,99 mm de espessura, tensão de 60 kVp, quando usado com filme D, foi o que obteve melhor desempenho, reduzindo a taxa de kerma no ar sem variar o índice de contraste das radiografias, mantendo a qualidade da imagem aceitável para diagnóstico, sem contudo aumentar o tempo de exposição.The aim of this study was to evaluate the effects of alternative filtration with the aluminum-zinc alloy in dental X-ray devices, regarding the energy spectrum, dose, contrast and image quality. This study was carried out comparing the conventional aluminum filter with aluminum-zinc alloy filters of various thicknesses and with different percentages of zinc in the alloy (2, 3, 4 and 5%. A conventional X-ray device operating with 60 and 70 kVp as well as D- and E-speed films were utilized in order to obtain images of a phantom and an aluminum step wedge. The utilization

  9. Seleção dos parâmetros através dos custos de soldagem para aplicação de revestimento com ligas de níquel depositadas pelo processo MIG/MAG Using the welding costs to select welding parameters for Weld Overlay with nickel alloy through the GMAW process

    Directory of Open Access Journals (Sweden)

    Antonio Rodolfo Paulino Pessoa

    2011-03-01

    Full Text Available Neste trabalho foram calculados e comparados os custos de soldagem associados a cada um dos ensaios realizados, como forma de determinar parâmetros operacionais adequados e economicamente viáveis para soldagem com o processo MIG/MAG com transferência metálica por curto-circuito, visando uma correta deposição de revestimentos com ligas de níquel sobre um substrato de aço C-Mn. O número de ensaios a serem realizados, foi determinado pelo uso do método Taguchi que dividiu os ensaios em duas matrizes L9, resultando num total de 18 ensaios. Na comparação dos gastos despendidos em cada um dos ensaios foi utilizado o custo direto total da soldagem de um revestimento com 55 mm de largura e 190 mm de comprimento, utilizando uma sobreposição de 50%. Com base nos resultados dos ensaios foram pré-selecionados quatro ensaios (R7, R11, R12 e RC4, dentre os quais o ensaio R11 apresentou o menor custo. Mas vale ressaltar que nos quatro ensaios pré-selecionados o material de adição utilizado foi a liga 625, pois esta liga apresentar um custo do arame-eletrodo muito inferior as demais ligas (C-276 e 686. Assim a escolha do material de adição para aplicação do revestimento ficou restrita somente a liga 625.In this work were calculated and compared the welding costs for each of the tests performed to determine operational parameters and economically feasible for welding with GMAW process in a short circuiting transfer mode, aiming at a correct weld overlay with nickel alloy on a substrate of C-Mn steel. The number of tests to be performed was determined by using the Taguchi method that divided the tests into two L9 orthogonal arrays resulting in a total of 18 experiments. To compare the costs incurred in each of the tests we used the total direct cost of welding a layer with dimensions of 55 x 190 mm, using an overlap of 50%. Based on the results of the tests were pre-selected four tests (R7, R11, R12 and RC4, among which the test R11 has the

  10. Audiovisual biofeedback improves motion prediction accuracy.

    Science.gov (United States)

    Pollock, Sean; Lee, Danny; Keall, Paul; Kim, Taeho

    2013-04-01

    The accuracy of motion prediction, utilized to overcome the system latency of motion management radiotherapy systems, is hampered by irregularities present in the patients' respiratory pattern. Audiovisual (AV) biofeedback has been shown to reduce respiratory irregularities. The aim of this study was to test the hypothesis that AV biofeedback improves the accuracy of motion prediction. An AV biofeedback system combined with real-time respiratory data acquisition and MR images were implemented in this project. One-dimensional respiratory data from (1) the abdominal wall (30 Hz) and (2) the thoracic diaphragm (5 Hz) were obtained from 15 healthy human subjects across 30 studies. The subjects were required to breathe with and without the guidance of AV biofeedback during each study. The obtained respiratory signals were then implemented in a kernel density estimation prediction algorithm. For each of the 30 studies, five different prediction times ranging from 50 to 1400 ms were tested (150 predictions performed). Prediction error was quantified as the root mean square error (RMSE); the RMSE was calculated from the difference between the real and predicted respiratory data. The statistical significance of the prediction results was determined by the Student's t-test. Prediction accuracy was considerably improved by the implementation of AV biofeedback. Of the 150 respiratory predictions performed, prediction accuracy was improved 69% (103/150) of the time for abdominal wall data, and 78% (117/150) of the time for diaphragm data. The average reduction in RMSE due to AV biofeedback over unguided respiration was 26% (p biofeedback improves prediction accuracy. This would result in increased efficiency of motion management techniques affected by system latencies used in radiotherapy.

  11. Achieving Climate Change Absolute Accuracy in Orbit

    Science.gov (United States)

    Wielicki, Bruce A.; Young, D. F.; Mlynczak, M. G.; Thome, K. J; Leroy, S.; Corliss, J.; Anderson, J. G.; Ao, C. O.; Bantges, R.; Best, F.; Bowman, K.; Brindley, H.; Butler, J. J.; Collins, W.; Dykema, J. A.; Doelling, D. R.; Feldman, D. R.; Fox, N.; Huang, X.; Holz, R.; Huang, Y.; Jennings, D.; Jin, Z.; Johnson, D. G.; Jucks, K.; Kato, S.; Kratz, D. P.; Liu, X.; Lukashin, C.; Mannucci, A. J.; Phojanamongkolkij, N.; Roithmayr, C. M.; Sandford, S.; Taylor, P. C.; Xiong, X.

    2013-01-01

    The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission will provide a calibration laboratory in orbit for the purpose of accurately measuring and attributing climate change. CLARREO measurements establish new climate change benchmarks with high absolute radiometric accuracy and high statistical confidence across a wide range of essential climate variables. CLARREO's inherently high absolute accuracy will be verified and traceable on orbit to Système Internationale (SI) units. The benchmarks established by CLARREO will be critical for assessing changes in the Earth system and climate model predictive capabilities for decades into the future as society works to meet the challenge of optimizing strategies for mitigating and adapting to climate change. The CLARREO benchmarks are derived from measurements of the Earth's thermal infrared spectrum (5-50 micron), the spectrum of solar radiation reflected by the Earth and its atmosphere (320-2300 nm), and radio occultation refractivity from which accurate temperature profiles are derived. The mission has the ability to provide new spectral fingerprints of climate change, as well as to provide the first orbiting radiometer with accuracy sufficient to serve as the reference transfer standard for other space sensors, in essence serving as a "NIST [National Institute of Standards and Technology] in orbit." CLARREO will greatly improve the accuracy and relevance of a wide range of space-borne instruments for decadal climate change. Finally, CLARREO has developed new metrics and methods for determining the accuracy requirements of climate observations for a wide range of climate variables and uncertainty sources. These methods should be useful for improving our understanding of observing requirements for most climate change observations.

  12. A Theory of Local Matching: SIFT and Beyond

    OpenAIRE

    Mobahi, Hossein; Soatto, Stefano

    2016-01-01

    Why has SIFT been so successful? Why its extension, DSP-SIFT, can further improve SIFT? Is there a theory that can explain both? How can such theory benefit real applications? Can it suggest new algorithms with reduced computational complexity or new descriptors with better accuracy for matching? We construct a general theory of local descriptors for visual matching. Our theory relies on concepts in energy minimization and heat diffusion. We show that SIFT and DSP-SIFT approximate the solutio...

  13. Possibility Theory versus Probability Theory in Fuzzy Measure Theory

    Directory of Open Access Journals (Sweden)

    Parul Agarwal

    2015-05-01

    Full Text Available The purpose of this paper is to compare probability theory with possibility theory, and to use this comparison in comparing probability theory with fuzzy set theory. The best way of comparing probabilistic and possibilistic conceptualizations of uncertainty is to examine the two theories from a broader perspective. Such a perspective is offered by evidence theory, within which probability theory and possibility theory are recognized as special branches. While the various characteristic of possibility theory within the broader framework of evidence theory are expounded in this paper, we need to introduce their probabilistic counterparts to facilitate our discussion.

  14. On the Accuracy of Asymptotic Solutions for TM Waves Diffracting on an Impedance Wedge

    Directory of Open Access Journals (Sweden)

    Sonia Fu

    2014-01-01

    Full Text Available The contribution focuses on the accuracy of two asymptotic solutions aimed at representing the electromagnetic field scattered by penetrable wedges. One is a heuristic manipulation of the solution for the perfect electrical conductor, and the other one is a more rigorous coefficient based on approximate boundary conditions. The results presented here extend those proposed by other authors by illustrating the accuracy of such solutions at the edge of validity of the uniform theory of diffraction. In particular, they show that the heuristic formulation can be freely applied in similar conditions, while the other might not always lead to accurate predictions.

  15. Biocultural Theory

    DEFF Research Database (Denmark)

    Carroll, Joseph; Clasen, Mathias; Jonsson, Emelie

    2017-01-01

    Biocultural theory is an integrative research program designed to investigate the causal interactions between biological adaptations and cultural constructions. From the biocultural perspective, cultural processes are rooted in the biological necessities of the human life cycle: specifically human...... and ideological beliefs, and artistic practices such as music, dance, painting, and storytelling. Establishing biocultural theory as a program that self-consciously encompasses the different particular forms of human evolutionary research could help scholars and scientists envision their own specialized areas...... of research as contributions to a coherent, collective research program. This article argues that a mature biocultural paradigm needs to be informed by at least 7 major research clusters: (a) gene-culture coevolution; (b) human life history theory; (c) evolutionary social psychology; (d) anthropological...

  16. Chemical accuracy from quantum Monte Carlo for the benzene dimer

    Energy Technology Data Exchange (ETDEWEB)

    Azadi, Sam, E-mail: s.azadi@ucl.ac.uk [Department of Earth Science and Thomas Young Centre, University College London, London WC1E 6BT (United Kingdom); Cohen, R. E. [London Centre for Nanotechnology, University College London, London WC1E 6BT, United Kingdom and Extreme Materials Initiative, Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015 (United States)

    2015-09-14

    We report an accurate study of interactions between benzene molecules using variational quantum Monte Carlo (VMC) and diffusion quantum Monte Carlo (DMC) methods. We compare these results with density functional theory using different van der Waals functionals. In our quantum Monte Carlo (QMC) calculations, we use accurate correlated trial wave functions including three-body Jastrow factors and backflow transformations. We consider two benzene molecules in the parallel displaced geometry, and find that by highly optimizing the wave function and introducing more dynamical correlation into the wave function, we compute the weak chemical binding energy between aromatic rings accurately. We find optimal VMC and DMC binding energies of −2.3(4) and −2.7(3) kcal/mol, respectively. The best estimate of the coupled-cluster theory through perturbative triplets/complete basis set limit is −2.65(2) kcal/mol [Miliordos et al., J. Phys. Chem. A 118, 7568 (2014)]. Our results indicate that QMC methods give chemical accuracy for weakly bound van der Waals molecular interactions, comparable to results from the best quantum chemistry methods.

  17. Lattice theory

    CERN Document Server

    Donnellan, Thomas; Maxwell, E A; Plumpton, C

    1968-01-01

    Lattice Theory presents an elementary account of a significant branch of contemporary mathematics concerning lattice theory. This book discusses the unusual features, which include the presentation and exploitation of partitions of a finite set. Organized into six chapters, this book begins with an overview of the concept of several topics, including sets in general, the relations and operations, the relation of equivalence, and the relation of congruence. This text then defines the relation of partial order and then partially ordered sets, including chains. Other chapters examine the properti

  18. Probability theory

    CERN Document Server

    S Varadhan, S R

    2001-01-01

    This volume presents topics in probability theory covered during a first-year graduate course given at the Courant Institute of Mathematical Sciences. The necessary background material in measure theory is developed, including the standard topics, such as extension theorem, construction of measures, integration, product spaces, Radon-Nikodym theorem, and conditional expectation. In the first part of the book, characteristic functions are introduced, followed by the study of weak convergence of probability distributions. Then both the weak and strong limit theorems for sums of independent rando

  19. Galois theory

    CERN Document Server

    Stewart, Ian

    2003-01-01

    Ian Stewart's Galois Theory has been in print for 30 years. Resoundingly popular, it still serves its purpose exceedingly well. Yet mathematics education has changed considerably since 1973, when theory took precedence over examples, and the time has come to bring this presentation in line with more modern approaches.To this end, the story now begins with polynomials over the complex numbers, and the central quest is to understand when such polynomials have solutions that can be expressed by radicals. Reorganization of the material places the concrete before the abstract, thus motivating the g

  20. Response time accuracy in Apple Macintosh computers.

    Science.gov (United States)

    Neath, Ian; Earle, Avery; Hallett, Darcy; Surprenant, Aimée M

    2011-06-01

    The accuracy and variability of response times (RTs) collected on stock Apple Macintosh computers using USB keyboards was assessed. A photodiode detected a change in the screen's luminosity and triggered a solenoid that pressed a key on the keyboard. The RTs collected in this way were reliable, but could be as much as 100 ms too long. The standard deviation of the measured RTs varied between 2.5 and 10 ms, and the distributions approximated a normal distribution. Surprisingly, two recent Apple-branded USB keyboards differed in their accuracy by as much as 20 ms. The most accurate RTs were collected when an external CRT was used to display the stimuli and Psychtoolbox was able to synchronize presentation with the screen refresh. We conclude that RTs collected on stock iMacs can detect a difference as small as 5-10 ms under realistic conditions, and this dictates which types of research should or should not use these systems.

  1. Improving the accuracy of dynamic mass calculation

    Directory of Open Access Journals (Sweden)

    Oleksandr F. Dashchenko

    2015-06-01

    Full Text Available With the acceleration of goods transporting, cargo accounting plays an important role in today's global and complex environment. Weight is the most reliable indicator of the materials control. Unlike many other variables that can be measured indirectly, the weight can be measured directly and accurately. Using strain-gauge transducers, weight value can be obtained within a few milliseconds; such values correspond to the momentary load, which acts on the sensor. Determination of the weight of moving transport is only possible by appropriate processing of the sensor signal. The aim of the research is to develop a methodology for weighing freight rolling stock, which increases the accuracy of the measurement of dynamic mass, in particular wagon that moves. Apart from time-series methods, preliminary filtration for improving the accuracy of calculation is used. The results of the simulation are presented.

  2. Accuracy of forecasts in strategic intelligence.

    Science.gov (United States)

    Mandel, David R; Barnes, Alan

    2014-07-29

    The accuracy of 1,514 strategic intelligence forecasts abstracted from intelligence reports was assessed. The results show that both discrimination and calibration of forecasts was very good. Discrimination was better for senior (versus junior) analysts and for easier (versus harder) forecasts. Miscalibration was mainly due to underconfidence such that analysts assigned more uncertainty than needed given their high level of discrimination. Underconfidence was more pronounced for harder (versus easier) forecasts and for forecasts deemed more (versus less) important for policy decision making. Despite the observed underconfidence, there was a paucity of forecasts in the least informative 0.4-0.6 probability range. Recalibrating the forecasts substantially reduced underconfidence. The findings offer cause for tempered optimism about the accuracy of strategic intelligence forecasts and indicate that intelligence producers aim to promote informativeness while avoiding overstatement.

  3. High accuracy 3-D laser radar

    DEFF Research Database (Denmark)

    Busck, Jens; Heiselberg, Henning

    2004-01-01

    We have developed a mono-static staring 3-D laser radar based on gated viewing with range accuracy below 1 m at 10 m and 1 cm at 100. We use a high sensitivity, fast, intensified CCD camera, and a Nd:Yag passively Q-switched 32.4 kHz pulsed green laser at 532 nm. The CCD has 752x582 pixels. Camera...

  4. On the accuracy of language trees.

    Directory of Open Access Journals (Sweden)

    Simone Pompei

    Full Text Available Historical linguistics aims at inferring the most likely language phylogenetic tree starting from information concerning the evolutionary relatedness of languages. The available information are typically lists of homologous (lexical, phonological, syntactic features or characters for many different languages: a set of parallel corpora whose compilation represents a paramount achievement in linguistics. From this perspective the reconstruction of language trees is an example of inverse problems: starting from present, incomplete and often noisy, information, one aims at inferring the most likely past evolutionary history. A fundamental issue in inverse problems is the evaluation of the inference made. A standard way of dealing with this question is to generate data with artificial models in order to have full access to the evolutionary process one is going to infer. This procedure presents an intrinsic limitation: when dealing with real data sets, one typically does not know which model of evolution is the most suitable for them. A possible way out is to compare algorithmic inference with expert classifications. This is the point of view we take here by conducting a thorough survey of the accuracy of reconstruction methods as compared with the Ethnologue expert classifications. We focus in particular on state-of-the-art distance-based methods for phylogeny reconstruction using worldwide linguistic databases. In order to assess the accuracy of the inferred trees we introduce and characterize two generalizations of standard definitions of distances between trees. Based on these scores we quantify the relative performances of the distance-based algorithms considered. Further we quantify how the completeness and the coverage of the available databases affect the accuracy of the reconstruction. Finally we draw some conclusions about where the accuracy of the reconstructions in historical linguistics stands and about the leading directions to improve

  5. The dimensional accuracy of the sintered billets

    Directory of Open Access Journals (Sweden)

    Чингиз Ариф оглы Алиев

    2016-01-01

    Full Text Available The article presents the results of assessing the impact of the behaviour stability of the components included in the compositions and process parameters of their production, on the dimensional accuracy of workpieces. It was found that by increasing the amount of oxide in the composition is greater compaction of the sintered billet in the process of heat treatment. This also increases the density of all components of the composition

  6. Accuracy of radiocarbon analyses at ANTARES

    Energy Technology Data Exchange (ETDEWEB)

    Lawson, E.M.; Fink, D.; Hotchkis, M.; Hua, Q.; Jacobsen, G.; Smith, A.M.; Tuniz, C. [Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW (Australia)

    1996-12-31

    Accuracy in Accelerator Mass Spectroscopy (AMS) measurements, as distinct from precision, requires the application of a number of corrections. Most of these are well known except in extreme circumstances and AMS can deliver radiocarbon results which are both precise and accurate in the 0.5 to 1.0% range. The corrections involved in obtaining final radiocarbon ages are discussed. 3 refs., 1 tab.

  7. Physical Accuracy of Q Models of Seismic Attenuation

    Science.gov (United States)

    Morozov, I. B.

    2016-12-01

    Accuracy of theoretical models is a required prerequisite for any type of seismic imaging and interpretation. Among all geophysical disciplines, the theory of seismic and tidal attenuation is the least developed, and most practical studies use viscoelastic models based on empirical Q factors. To simplify imaging and inversions, the Qs are often approximated as frequency-independent or following a power law with frequency. However, simplicity of inversion should not outweigh the problematic physical accuracy of such models. Typical images of spatially-variable crustal and mantle Qs are "apparent," analogously to pseudo-depth, apparent-resistivity images in electrical imaging. Problems with Q models can be seen from controversial general observations present in many studies; for example: 1) In global Q models, bulk attenuation is much lower than the shear one throughout the whole Earth. This is considered a fundamental relation for the Earth; nevertheless, it is also very peculiar physically and suggests a negative Q for the Lamé modulus. This relation is also not supported by most first-principle models of materials and laboratory studies. 2) The Q parameterization requires that the entire outer core of the Earth is assigned zero attenuation, despite its large volume, presence of viscosity and shear deformation in free oscillations. 3) In laboratory and surface-wave studies, the bulk and shear Qs can be different for different wave modes, different sample sizes boundary conditions on the surface. Similarly, the Qs measured from body-S, Love, Lg, or ScS waves may not equal each other. 4) In seismic coda studies, the Q is often found to be linearly (or even faster) increasing with frequency. Such character of energy dissipation is controversial physically, but can be readily explained as an artifact of inaccurately-known geometrical spreading. To overcome the physical inaccuracies and apparent character of seismic attenuation models, mechanical theories of materials

  8. Accuracy of Stokes integration for geoid computation

    Science.gov (United States)

    Ismail, Zahra; Jamet, Olivier; Altamimi, Zuheir

    2014-05-01

    Geoid determination by remove-compute-restore (RCR) technique involves the application of Stokes's integral on reduced gravity anomalies. Reduced gravity anomalies are obtained through interpolation after removing low degree gravity signal from space spherical harmonic model and high frequency from topographical effects and cover a spectre ranging from degree 150-200. Stokes's integral is truncated to a limited region around the computation point producing an error that will be reducing by a modification of Stokes's kernel. We study Stokes integral accuracy on synthetic signal of various frequency ranges, produced with EGM2008 spherical harmonic coefficients up to degree 2000. We analyse the integration error according to the frequency range of signal, the resolution of gravity anomaly grid and the radius of Stokes integration. The study shows that the behaviour of the relative errors is frequency independent. The standard Stokes kernel is though insufficient to produce 1cm geoid accuracy without a removal of the major part of the gravity signal up to degree 600. The Integration over an area of radius greater than 3 degree does not improve accuracy improvement. The results are compared to a similar experiment using the modified Stokes kernel formula (Ellmann2004, Sjöberg2003). References: Ellmann, A. (2004) The geoid for the Baltic countries determined by least-squares modification of Stokes formula. Sjöberg, LE (2003). A general model of modifying Stokes formula and its least-squares solution Journal of Geodesy, 77. 459-464.

  9. Solving Nonlinear Euler Equations with Arbitrary Accuracy

    Science.gov (United States)

    Dyson, Rodger W.

    2005-01-01

    A computer program that efficiently solves the time-dependent, nonlinear Euler equations in two dimensions to an arbitrarily high order of accuracy has been developed. The program implements a modified form of a prior arbitrary- accuracy simulation algorithm that is a member of the class of algorithms known in the art as modified expansion solution approximation (MESA) schemes. Whereas millions of lines of code were needed to implement the prior MESA algorithm, it is possible to implement the present MESA algorithm by use of one or a few pages of Fortran code, the exact amount depending on the specific application. The ability to solve the Euler equations to arbitrarily high accuracy is especially beneficial in simulations of aeroacoustic effects in settings in which fully nonlinear behavior is expected - for example, at stagnation points of fan blades, where linearizing assumptions break down. At these locations, it is necessary to solve the full nonlinear Euler equations, and inasmuch as the acoustical energy is of the order of 4 to 5 orders of magnitude below that of the mean flow, it is necessary to achieve an overall fractional error of less than 10-6 in order to faithfully simulate entropy, vortical, and acoustical waves.

  10. Accuracy of MRI in Growth Plate Measurement

    DEFF Research Database (Denmark)

    Shiguetomi Medina, Juan Manuel; Rahbek, Ole; Ringgaard, Steffen

    2013-01-01

    Objective. Analysis of the accuracy of growth plate thickness measurements detected on 1.5T and 7T MR images using histology sections as gold standard. Materials and Methods. Four defrosted pig tibiae were 1.5T MR scanned and one fresh tibia was 7T MR scanned. The height of the growth plate...... was measured and compared to histology. Results. Histology measurements showed a mean growth plate thickness of 467 μm (SD = 82.2). The mean growth plate thickness measured in the 7T MR images was 465 μm (SD = 62.2) and 1325 μm (SD=183.5) on 1.5 MRI measurements. We found a better correlation between...... the growth plate thickness measured on the 7T MRI and histology samples compared to 1.5T, where the accuracy was poor. Conclusion. The growth plate can be identified and measured with high accuracy using 7T MRI. 1.5T MRI can only describe some morphological characteristics; its poor resolution impedes to do...

  11. Accuracy of MRI in Growth Plate Measurement

    DEFF Research Database (Denmark)

    Shiguetomi Medina, Juan Manuel; Rahbek, Ole; Ringgaard, Steffen

    2013-01-01

    Objective. Analysis of the accuracy of growth plate thickness measurements detected on 1.5T and 7T MR images using histology sections as gold standard. Materials and Methods. Four defrosted pig tibiae were 1.5T MR scanned and one fresh tibia was 7T MR scanned. The height of the growth plate...... was measured and compared to histology. Results. Histology measurements showed a mean growth plate thickness of 467 μm (SD = 82.2). The mean growth plate thickness measured in the 7T MR images was 465 μm (SD = 62.2) and 1325 μm (SD=183.5) on 1.5 MRI measurements. We found a better correlation between...... the growth plate thickness measured on the 7T MRI and histology samples compared to 1.5T, where the accuracy was poor. Conclusion. The growth plate can be identified and measured with high accuracy using 7T MRI. 1.5T MRI can only describe some morphological characteristics; its poor resolution impedes to do...

  12. Speed versus accuracy in collective decision making.

    Science.gov (United States)

    Franks, Nigel R; Dornhaus, Anna; Fitzsimmons, Jon P; Stevens, Martin

    2003-12-01

    We demonstrate a speed versus accuracy trade-off in collective decision making. House-hunting ant colonies choose a new nest more quickly in harsh conditions than in benign ones and are less discriminating. The errors that occur in a harsh environment are errors of judgement not errors of omission because the colonies have discovered all of the alternative nests before they initiate an emigration. Leptothorax albipennis ants use quorum sensing in their house hunting. They only accept a nest, and begin rapidly recruiting members of their colony, when they find within it a sufficient number of their nest-mates. Here we show that these ants can lower their quorum thresholds between benign and harsh conditions to adjust their speed-accuracy trade-off. Indeed, in harsh conditions these ants rely much more on individual decision making than collective decision making. Our findings show that these ants actively choose to take their time over judgements and employ collective decision making in benign conditions when accuracy is more important than speed.

  13. Species comparison of protein synthesis accuracy

    Energy Technology Data Exchange (ETDEWEB)

    Hirsch, G.P.; Popp, R.A.; Francis, M.C.; Bradshaw, B.S.; Bailiff, E.G.

    1978-01-01

    An important force in evolutionary selection may be informational efficiency, which results in a balance between the energy expended to maintain a high level of fidelity and the energy lost from errors or mutations in the production of defective offspring. The accuracy of DNA replication may be limited by the average accuracy of protein synthesis if the major source of enzymes which make copying errors are those that contain errors resulting from the processes of transcription and translation. Since many gene products are involved in transcription and translation the frequency of mutations which might affect protein fidelity is much higher than those affecting DNA copying. Species comparisons were made of the accuracy of protein synthesis to determine if the requirements for accurate protein synthesis were more stringent for long lived mammals. Using the incorporation of isoleucine in hemoglobin chains which contain no genetically coded isoleucine as a test of protein synthesis fidelity no correlation with lifespan was found among rabbit, marmoset, cow, pig, and human protein synthesis fidelity. The purfication techniques required to prepare highly purified protein for analysis and the criteria for purity are described.

  14. Accuracy and Completeness of Molecular Line Lists

    Science.gov (United States)

    Polyansky, Oleg; Tennyson, Jonathan

    2017-06-01

    We review recent progress in the calculation of the global, high-temperature and accurate room-temperature linelists of various molecules relevant for the analysis of both Earth and exoplanet atmospheres and cool stars. These global line lists can be constructed based on progress in calculation of energy levels up to dissociation and the fitting of the molecular PESs to the experimental data close to dissociation. Sub-percent accuracy in the intensity of calculated absorption lines is achieved thanks to progress in ab initio electronic structure calculations which is aided by the possibility of characterizing their accuracy by the comparison with experimental intensities measured with sub-percent accuracy for some molecular lines. The advantage of variational calculations over experiment though is the ability to produce billions of lines covering all the isotopologues, which is clearly impossible for the experimental observations. Atmospherically and astrophysically important molecules such as H_2O, CO_2, CO and H_3^+ will be considered together with some examples of the other molecules.

  15. PHAT: PHoto-z Accuracy Testing

    CERN Document Server

    Hildebrandt, H; Capak, P; Moustakas, L A; Wolf, C; Abdalla, F B; Assef, R J; Banerji, M; Benitez, N; Brammer, G B; Budavari, T; Carliles, S; Coe, D; Dahlen, T; Feldmann, R; Gerdes, D; Gillis, B; Ilbert, O; Kotulla, R; Lahav, O; Li, I H; Miralles, J -M; Purger, N; Schmidt, S; Singal, J

    2010-01-01

    Here we introduce PHAT, the PHoto-z Accuracy Testing programme, an international initiative to test and compare different methods of photo-z estimation. Two different test environments are set up, one (PHAT0) based on simulations to test the basic functionality of the different photo-z codes, and another one (PHAT1) based on data from the GOODS survey. The accuracy of the different methods is expressed and ranked by the global photo-z bias, scatter, and outlier rates. Most methods agree well on PHAT0 but produce photo-z scatters that can differ by up to a factor of two even in this idealised case. A larger spread in accuracy is found for PHAT1. Few methods benefit from the addition of mid-IR photometry. Remaining biases and systematic effects can be explained by shortcomings in the different template sets and the use of priors on the one hand and an insufficient training set on the other hand. Scatters of 4-8% in Delta_z/(1+z) were obtained, consistent with other studies. However, somewhat larger outlier rate...

  16. Computing High Accuracy Power Spectra with Pico

    CERN Document Server

    Fendt, William A

    2007-01-01

    This paper presents the second release of Pico (Parameters for the Impatient COsmologist). Pico is a general purpose machine learning code which we have applied to computing the CMB power spectra and the WMAP likelihood. For this release, we have made improvements to the algorithm as well as the data sets used to train Pico, leading to a significant improvement in accuracy. For the 9 parameter nonflat case presented here Pico can on average compute the TT, TE and EE spectra to better than 1% of cosmic standard deviation for nearly all $\\ell$ values over a large region of parameter space. Performing a cosmological parameter analysis of current CMB and large scale structure data, we show that these power spectra give very accurate 1 and 2 dimensional parameter posteriors. We have extended Pico to allow computation of the tensor power spectrum and the matter transfer function. Pico runs about 1500 times faster than CAMB at the default accuracy and about 250,000 times faster at high accuracy. Training Pico can be...

  17. Algorithms for improving accuracy of spray simulation

    Institute of Scientific and Technical Information of China (English)

    ZHANG HuiYa; ZHANG YuSheng; XIAO HeLin; XU Bo

    2007-01-01

    Fuel spray is the pivotal process of direct injection engine combustion. The accuracy of spray simulation determines the reliability of combustion calculation. However, the traditional techniques of spray simulation in KIVA and commercial CFD codes are very susceptible to grid resolution. As a consequence, predicted engine performance and emission can depend on the computational mesh. The two main causes of this problem are the droplet collision algorithm and coupling between gas and liquid phases. In order to improve the accuracy of spray simulation, the original KIVA code is modified using the cross mesh droplet collision (CMC) algorithm and gas phase velocity interpolation algorithm. In the constant volume apparatus and D.I. Diesel engine, the improvements of the modified KIVA code in spray simulation accuracy are checked from spray structure, predicted average drop size and spray tip penetration, respectively. The results show a dramatic decrease in grid dependency. With these changes, the distorted phenomenon of spray structure is vanished. The uncertainty in predicted average drop size is reduced from 30 to 5 μm in constant volume apparatus calculation, and the uncertainty is further reduced to 2 μm in an engine simulation. The predicted spray tip penetrations in engine simulation also have better consistency in medium and fine meshes.

  18. On accuracy of upper quantiles estimation

    Directory of Open Access Journals (Sweden)

    I. Markiewicz

    2010-11-01

    Full Text Available Flood frequency analysis (FFA entails the estimation of the upper tail of a probability density function (PDF of annual peak flows obtained from either the annual maximum series or partial duration series. In hydrological practice, the properties of various methods of upper quantiles estimation are identified with the case of known population distribution function. In reality, the assumed hypothetical model differs from the true one and one cannot assess the magnitude of error caused by model misspecification in respect to any estimated statistics. The opinion about the accuracy of the methods of upper quantiles estimation formed from the case of known population distribution function is upheld. The above-mentioned issue is the subject of the paper. The accuracy of large quantile assessments obtained from the four estimation methods is compared to two-parameter log-normal and log-Gumbel distributions and their three-parameter counterparts, i.e., three-parameter log-normal and GEV distributions. The cases of true and false hypothetical models are considered. The accuracy of flood quantile estimates depends on the sample size, the distribution type (both true and hypothetical, and strongly depends on the estimation method. In particular, the maximum likelihood method loses its advantageous properties in case of model misspecification.

  19. On accuracy of upper quantiles estimation

    Science.gov (United States)

    Markiewicz, I.; Strupczewski, W. G.; Kochanek, K.

    2010-11-01

    Flood frequency analysis (FFA) entails the estimation of the upper tail of a probability density function (PDF) of annual peak flows obtained from either the annual maximum series or partial duration series. In hydrological practice, the properties of various methods of upper quantiles estimation are identified with the case of known population distribution function. In reality, the assumed hypothetical model differs from the true one and one cannot assess the magnitude of error caused by model misspecification in respect to any estimated statistics. The opinion about the accuracy of the methods of upper quantiles estimation formed from the case of known population distribution function is upheld. The above-mentioned issue is the subject of the paper. The accuracy of large quantile assessments obtained from the four estimation methods is compared to two-parameter log-normal and log-Gumbel distributions and their three-parameter counterparts, i.e., three-parameter log-normal and GEV distributions. The cases of true and false hypothetical models are considered. The accuracy of flood quantile estimates depends on the sample size, the distribution type (both true and hypothetical), and strongly depends on the estimation method. In particular, the maximum likelihood method loses its advantageous properties in case of model misspecification.

  20. Effective theories of universal theories

    CERN Document Server

    Wells, James D

    2015-01-01

    It is well-known but sometimes overlooked that constraints on the oblique parameters (most notably $S$ and $T$ parameters) are only applicable to a special class of new physics scenarios known as universal theories. In the effective field theory (EFT) framework, the oblique parameters should not be associated with Wilson coefficients in a particular operator basis, unless restrictions have been imposed on the EFT so that it describes universal theories. We work out these restrictions, and present a detailed EFT analysis of universal theories. We find that at the dimension-6 level, universal theories are completely characterized by 16 parameters. They are conveniently chosen to be: 5 oblique parameters that agree with the commonly-adopted ones, 4 anomalous triple-gauge couplings, 3 rescaling factors for the $h^3$, $hff$, $hVV$ vertices, 3 parameters for $hVV$ vertices absent in the Standard Model, and 1 four-fermion coupling of order $y_f^2$. All these parameters are defined in an unambiguous and basis-indepen...

  1. Approximation methods in probability theory

    CERN Document Server

    Čekanavičius, Vydas

    2016-01-01

    This book presents a wide range of well-known and less common methods used for estimating the accuracy of probabilistic approximations, including the Esseen type inversion formulas, the Stein method as well as the methods of convolutions and triangle function. Emphasising the correct usage of the methods presented, each step required for the proofs is examined in detail. As a result, this textbook provides valuable tools for proving approximation theorems. While Approximation Methods in Probability Theory will appeal to everyone interested in limit theorems of probability theory, the book is particularly aimed at graduate students who have completed a standard intermediate course in probability theory. Furthermore, experienced researchers wanting to enlarge their toolkit will also find this book useful.

  2. Theory Overview

    CERN Document Server

    Lenz, Alexander

    2016-01-01

    We set the scene for theoretical issues in charm physics that were discussed at CHARM 2016 in Bologna. In particular we emphasize the importance of improving our understanding of standard model contributions to numerous charm observables and we discuss also possible tests of our theory tools, like the Heavy Quark Expansion via the lifetime ratios of $D$-mesons

  3. Scattering theory

    Energy Technology Data Exchange (ETDEWEB)

    Friedrich, Harald [Technische Univ. Muenchen, Garching (Germany). Physik-Department

    2013-08-01

    Written by the author of the widely acclaimed textbook. Theoretical Atomic Physics Includes sections on quantum reflection, tunable Feshbach resonances and Efimov states. Useful for advanced students and researchers. This book presents a concise and modern coverage of scattering theory. It is motivated by the fact that experimental advances have shifted and broadened the scope of applications where concepts from scattering theory are used, e.g. to the field of ultracold atoms and molecules, which has been experiencing enormous growth in recent years, largely triggered by the successful realization of Bose-Einstein condensates of dilute atomic gases in 1995. In the present treatment, special attention is given to the role played by the long-range behaviour of the projectile-target interaction, and a theory is developed, which is well suited to describe near-threshold bound and continuum states in realistic binary systems such as diatomic molecules or molecular ions. The level of abstraction is kept as low as at all possible, and deeper questions related to mathematical foundations of scattering theory are passed by. The book should be understandable for anyone with a basic knowledge of nonrelativistic quantum mechanics. It is intended for advanced students and researchers, and it is hoped that it will be useful for theorists and experimentalists alike.

  4. Matching theory

    CERN Document Server

    Plummer, MD

    1986-01-01

    This study of matching theory deals with bipartite matching, network flows, and presents fundamental results for the non-bipartite case. It goes on to study elementary bipartite graphs and elementary graphs in general. Further discussed are 2-matchings, general matching problems as linear programs, the Edmonds Matching Algorithm (and other algorithmic approaches), f-factors and vertex packing.

  5. Livability theory

    NARCIS (Netherlands)

    R. Veenhoven (Ruut)

    2014-01-01

    markdownabstract__Abstract__ Assumptions Livability theory involves the following six key assumptions: 1. Like all animals, humans have innate needs, such as for food, safety, and companionship. 2. Gratification of needs manifests in hedonic experience. 3. Hedonic experience determines how much we

  6. Theory U

    DEFF Research Database (Denmark)

    Monthoux, Pierre Guillet de; Statler, Matt

    2014-01-01

    The recent Carnegie report (Colby, et al., 2011) characterizes the goal of business education as the development of practical wisdom. In this chapter, the authors reframe Scharmer’s Theory U as an attempt to develop practical wisdom by applying certain European philosophical concepts. Specificall...

  7. Theory U

    DEFF Research Database (Denmark)

    Guillet de Monthoux, Pierre; Statler, Matt

    2017-01-01

    The recent Carnegie report (Colby, et al., 2011) characterizes the goal of business education as the development of practical wisdom. In this chapter, the authors reframe Scharmer's Theory U as an attempt to develop practical wisdom by applying certain European philosophical concepts. Specificall...

  8. Framing theory

    NARCIS (Netherlands)

    de Vreese, C.H.; Lecheler, S.; Mazzoleni, G.; Barnhurst, K.G.; Ikeda, K.; Maia, R.C.M.; Wessler, H.

    2016-01-01

    Political issues can be viewed from different perspectives and they can be defined differently in the news media by emphasizing some aspects and leaving others aside. This is at the core of news framing theory. Framing originates within sociology and psychology and has become one of the most used th

  9. Combinatorial Theory

    CERN Document Server

    Hall, Marshall

    2011-01-01

    Includes proof of van der Waerden's 1926 conjecture on permanents, Wilson's theorem on asymptotic existence, and other developments in combinatorics since 1967. Also covers coding theory and its important connection with designs, problems of enumeration, and partition. Presents fundamentals in addition to latest advances, with illustrative problems at the end of each chapter. Enlarged appendixes include a longer list of block designs.

  10. Activity Theory

    DEFF Research Database (Denmark)

    Bertelsen, Olav Wedege; Bødker, Susanne

    2003-01-01

    the young HCI research tradition. But HCI was already facing problems: lack of consideration for other aspects of human behavior, for interaction with other people, for culture. Cognitive science-based theories lacked means to address several issues that came out of the empirical projects....

  11. Theory U

    DEFF Research Database (Denmark)

    Monthoux, Pierre Guillet de; Statler, Matt

    2014-01-01

    The recent Carnegie report (Colby, et al., 2011) characterizes the goal of business education as the development of practical wisdom. In this chapter, the authors reframe Scharmer’s Theory U as an attempt to develop practical wisdom by applying certain European philosophical concepts. Specifically...

  12. The electron-propagator approach to conceptual density-functional theory

    Indian Academy of Sciences (India)

    Junia Melin; Paul W Ayers; J V Ortiz

    2005-09-01

    Both electron propagator theory and density-functional theory provide conceptually useful information about chemical reactivity and, most especially, charge transfer. This paper elucidates thequalitative and quantitative links between the two theories, with emphasis on how the reactivity indicators of conceptual density-functional theory can be derived from electron propagator theory. Electron propagator theory could be used to compute reactivity indices with high accuracy at reasonable computational cost.

  13. A topologia molecular QTAIM e a descrição mecânico-quântica de ligações de hidrogênio e ligações de di-hidrogênio The QTAIM molecular topology and the quantum-mechanical description of hydrogen bonds and dihydrogen bonds

    Directory of Open Access Journals (Sweden)

    Boaz G. Oliveira

    2010-01-01

    Full Text Available Hydrogen bonds formed through the interaction between a high electronic density center (lone electron pairs, π or pseudo-π bonds and proton donors cause important electronic and vibrational phenomena in many systems. However, it was demonstrated that proton donors interact with hydrides, such as alkali and alkaline earth metals (BeH2, MgH2, LiH and NaH, what yields a new type of interaction so-called dihydrogen bonds. The characterization of these interactions has been performed at light of the Quantum Theory of Atoms in Molecules (QTAIM, by which the electronic densities ρ are quantified and the intermolecular regions are characterized as closed-shell interactions through the analysis of the Laplacian field ∇2ρ.

  14. Examining rating quality in writing assessment: rater agreement, error, and accuracy.

    Science.gov (United States)

    Wind, Stefanie A; Engelhard, George

    2012-01-01

    The use of performance assessments in which human raters evaluate student achievement has become increasingly prevalent in high-stakes assessment systems such as those associated with recent policy initiatives (e.g., Race to the Top). In this study, indices of rating quality are compared between two measurement perspectives. Within the context of a large-scale writing assessment, this study focuses on the alignment between indices of rater agreement, error, and accuracy based on traditional and Rasch measurement theory perspectives. Major empirical findings suggest that Rasch-based indices of model-data fit for ratings provide information about raters that is comparable to direct measures of accuracy. The use of easily obtained approximations of direct accuracy measures holds significant implications for monitoring rating quality in large-scale rater-mediated performance assessments.

  15. Combining atlas based segmentation and intensity classification with nearest neighbor transform and accuracy weighted vote.

    Science.gov (United States)

    Sdika, Michaël

    2010-04-01

    In this paper, different methods to improve atlas based segmentation are presented. The first technique is a new mapping of the labels of an atlas consistent with a given intensity classification segmentation. This new mapping combines the two segmentations using the nearest neighbor transform and is especially effective for complex and folded regions like the cortex where the registration is difficult. Then, in a multi atlas context, an original weighting is introduced to combine the segmentation of several atlases using a voting procedure. This weighting is derived from statistical classification theory and is computed offline using the atlases as a training dataset. Concretely, the accuracy map of each atlas is computed and the vote is weighted by the accuracy of the atlases. Numerical experiments have been performed on publicly available in vivo datasets and show that, when used together, the two techniques provide an important improvement of the segmentation accuracy.

  16. Optimization and Mechanical Accuracy Reliability of a New Type of Forging Manipulator

    Institute of Scientific and Technical Information of China (English)

    CHEN Kang; MA Chunxiang; ZHENG Maoqi; GAO Feng

    2015-01-01

    Researches on forging manipulator have enormous influence on the development of the forging industry and national economy. Clamp device and lifting mechanism are the core parts of forging manipulator, and have been studied for longer time. However, the optimization and mechanical accuracy reliability of them are less analyzed. Based on General Function(GF) set and parallel mechanism theory, proper configuration of 10t forging manipulator is selected firstly. A new type of forging manipulator driven by cylinders is proposed. After solved mechanical analysis of manipulator’s core mechanisms, expressions of force of cylinders are carried out. In order to achieve smaller force afforded by cylinders and better mechanical characteristics, some particular sizes of core mechanisms are optimized intuitively through the combined use of the genetic algorithms(GA) and GUI interface in MATLAB. Comparing with the original mechanisms, optimized clamp saves at least 8 percent efforts and optimized lifting mechanism 20 percent under maximum working condition. Finally, considering the existed manufacture error of components, mechanical accuracy reliability of optimized clamp, lifting mechanism and whole manipulator are demonstrated respectively based on fuzzy reliability theory. Obtained results show that the accuracy reliability of optimized clamp is bigger than 0.991 and that of optimized lifting mechanism is 0.995. To the whole manipulator under maximum working condition, that value exceeds 0.986 4, which means that optimized manipulator has high motion accuracy and is reliable. A new intuitive method is created to optimize forging manipulator sizes efficiently and more practical theory is utilized to analyze mechanical accuracy reliability of forging manipulator precisely.

  17. Text Manipulation Judgment Accuracy: An Exploratory Study

    Science.gov (United States)

    2003-03-25

    reduce, or divert attention from information. Eckman (1985) argues that concealments alone may be used to deceive; however, it is often the case...this study focuses on distortion of existing information, and in agreement with Eckman , some original portions of the information were replaced or...13 Information Manipulation Theory The English language philosopher Paul Grice (1975) proposes that in ordinary conversation, speakers and

  18. Diagnostic accuracy of Focused Abdominal Sonography

    Directory of Open Access Journals (Sweden)

    Cheung Kent Shek

    2012-11-01

    Full Text Available 【Abstract】Objective: Focused Abdominal Sono-graphy for Trauma (FAST is widely used for the detection of intraperitoneal free fluids in patients suffering from blunt abdominal trauma (BAT. This study aimed at assessing the diagnostic accuracy of this investigation in a designated trauma centre. Methods: This was a retrospective study of BAT pa-tients over a 6 year period seen in a trauma centre in Hong Kong. FAST findings were compared with laparotomy, ab-dominal computed tomography or autopsy findings, which served as the gold standard for presence of intraperi-toneal free fluids. The patients who did not have FAST or gold standard confirmatory test performed, had preexisting peritoneal fluid, died at resuscitation or had imcomplete docu-mentation of FAST findings were excluded. The performance of FAST was expressed as sensitivity, specificity, predic-tive values (PV, likelihood ratios (LR and accuracy. Results: FAST was performed in 302 patients and 153 of them were included in this analysis. The sensitivity, specificity, positive PV, negative PV, positive LR, negative LR and accuracy for FAST were respectively 50.0%, 97.3%, 87.0%, 84.6%, 18.8, 0.5 and 85.0%. FAST was found to be more sensitive in less severely injured patients and more specific in more severely injured patients. Conclusion: FAST is a reliable investigation in the initial assessment of BAT patients. The diagnostic values of FAST could be affected by the severity of injury and staff training is needed to further enhance its effective use. Key words: Laparotomy; Autopsy; Tomography, X-ray computed; Tomography, spiral computed; Ultra-sonography

  19. [True color accuracy in digital forensic photography].

    Science.gov (United States)

    Ramsthaler, Frank; Birngruber, Christoph G; Kröll, Ann-Katrin; Kettner, Mattias; Verhoff, Marcel A

    2016-01-01

    Forensic photographs not only need to be unaltered and authentic and capture context-relevant images, along with certain minimum requirements for image sharpness and information density, but color accuracy also plays an important role, for instance, in the assessment of injuries or taphonomic stages, or in the identification and evaluation of traces from photos. The perception of color not only varies subjectively from person to person, but as a discrete property of an image, color in digital photos is also to a considerable extent influenced by technical factors such as lighting, acquisition settings, camera, and output medium (print, monitor). For these reasons, consistent color accuracy has so far been limited in digital photography. Because images usually contain a wealth of color information, especially for complex or composite colors or shades of color, and the wavelength-dependent sensitivity to factors such as light and shadow may vary between cameras, the usefulness of issuing general recommendations for camera capture settings is limited. Our results indicate that true image colors can best and most realistically be captured with the SpyderCheckr technical calibration tool for digital cameras tested in this study. Apart from aspects such as the simplicity and quickness of the calibration procedure, a further advantage of the tool is that the results are independent of the camera used and can also be used for the color management of output devices such as monitors and printers. The SpyderCheckr color-code patches allow true colors to be captured more realistically than with a manual white balance tool or an automatic flash. We therefore recommend that the use of a color management tool should be considered for the acquisition of all images that demand high true color accuracy (in particular in the setting of injury documentation).

  20. Sturmians and generalized sturmians in quantum theory

    DEFF Research Database (Denmark)

    Avery, John Scales; Avery, James Emil

    2012-01-01

    The theory of Sturmians and generalized Sturmians is reviewed. It is shown that when generalized Sturmians are used as basis functions, calculations on the spectra and physical properties of few-electron atoms can be performed with great ease and good accuracy. The use of many-center Coulomb Stur...

  1. Communication theory

    DEFF Research Database (Denmark)

    Stein, Irene F.; Stelter, Reinhard

    2011-01-01

    Communication theory covers a wide variety of theories related to the communication process (Littlejohn, 1999). Communication is not simply an exchange of information, in which we have a sender and a receiver. This very technical concept of communication is clearly outdated; a human being...... is not a data processing device. In this chapter, communication is understood as a process of shared meaning-making (Bruner, 1990). Human beings interpret their environment, other people, and themselves on the basis of their dynamic interaction with the surrounding world. Meaning is essential because people...... ascribe specific meanings to their experiences, their actions in life or work, and their interactions. Meaning is reshaped, adapted, and transformed in every communication encounter. Furthermore, meaning is cocreated in dialogues or in communities of practice, such as in teams at a workplace or in school...

  2. Potential theory

    CERN Document Server

    Helms, Lester L

    2014-01-01

    Potential Theory presents a clear path from calculus to classical potential theory and beyond, with the aim of moving the reader into the area of mathematical research as quickly as possible. The subject matter is developed from first principles using only calculus. Commencing with the inverse square law for gravitational and electromagnetic forces and the divergence theorem, the author develops methods for constructing solutions of Laplace's equation on a region with prescribed values on the boundary of the region. The latter half of the book addresses more advanced material aimed at those with the background of a senior undergraduate or beginning graduate course in real analysis. Starting with solutions of the Dirichlet problem subject to mixed boundary conditions on the simplest of regions, methods of morphing such solutions onto solutions of Poisson's equation on more general regions are developed using diffeomorphisms and the Perron-Wiener-Brelot method, culminating in application to Brownian motion. In ...

  3. Elastoplasticity theory

    CERN Document Server

    Hashiguchi, Koichi

    2014-01-01

    This book was written to serve as the standard textbook of elastoplasticity for students, engineers and researchers in the field of applied mechanics. The present second edition is improved thoroughly from the first edition by selecting the standard theories from various formulations and models, which are required to study the essentials of elastoplasticity steadily and effectively and will remain universally in the history of elastoplasticity. It opens with an explanation of vector-tensor analysis and continuum mechanics as a foundation to study elastoplasticity theory, extending over various strain and stress tensors and their rates. Subsequently, constitutive equations of elastoplastic and viscoplastic deformations for monotonic, cyclic and non-proportional loading behavior in a general rate and their applications to metals and soils are described in detail, and constitutive equations of friction behavior between solids and its application to the prediction of stick-slip phenomena are delineated. In additi...

  4. Operator theory

    CERN Document Server

    2015-01-01

    A one-sentence definition of operator theory could be: The study of (linear) continuous operations between topological vector spaces, these being in general (but not exclusively) Fréchet, Banach, or Hilbert spaces (or their duals). Operator theory is thus a very wide field, with numerous facets, both applied and theoretical. There are deep connections with complex analysis, functional analysis, mathematical physics, and electrical engineering, to name a few. Fascinating new applications and directions regularly appear, such as operator spaces, free probability, and applications to Clifford analysis. In our choice of the sections, we tried to reflect this diversity. This is a dynamic ongoing project, and more sections are planned, to complete the picture. We hope you enjoy the reading, and profit from this endeavor.

  5. Accuracy and precision of an IGRT solution.

    Science.gov (United States)

    Webster, Gareth J; Rowbottom, Carl G; Mackay, Ranald I

    2009-01-01

    Image-guided radiotherapy (IGRT) can potentially improve the accuracy of delivery of radiotherapy treatments by providing high-quality images of patient anatomy in the treatment position that can be incorporated into the treatment setup. The achievable accuracy and precision of delivery of highly complex head-and-neck intensity modulated radiotherapy (IMRT) plans with an IGRT technique using an Elekta Synergy linear accelerator and the Pinnacle Treatment Planning System (TPS) was investigated. Four head-and-neck IMRT plans were delivered to a semi-anthropomorphic head-and-neck phantom and the dose distribution was measured simultaneously by up to 20 microMOSFET (metal oxide semiconductor field-effect transmitter) detectors. A volumetric kilovoltage (kV) x-ray image was then acquired in the treatment position, fused with the phantom scan within the TPS using Syntegra software, and used to recalculate the dose with the precise delivery isocenter at the actual position of each detector within the phantom. Three repeat measurements were made over a period of 2 months to reduce the effect of random errors in measurement or delivery. To ensure that the noise remained below 1.5% (1 SD), minimum doses of 85 cGy were delivered to each detector. The average measured dose was systematically 1.4% lower than predicted and was consistent between repeats. Over the 4 delivered plans, 10/76 measurements showed a systematic error > 3% (3/76 > 5%), for which several potential sources of error were investigated. The error was ultimately attributable to measurements made in beam penumbrae, where submillimeter positional errors result in large discrepancies in dose. The implementation of an image-guided technique improves the accuracy of dose verification, particularly within high-dose gradients. The achievable accuracy of complex IMRT dose delivery incorporating image-guidance is within +/- 3% in dose over the range of sample points. For some points in high-dose gradients

  6. Accuracy in Robot Generated Image Data Sets

    DEFF Research Database (Denmark)

    Aanæs, Henrik; Dahl, Anders Bjorholm

    2015-01-01

    In this paper we present a practical innovation concerning how to achieve high accuracy of camera positioning, when using a 6 axis industrial robots to generate high quality data sets for computer vision. This innovation is based on the realization that to a very large extent the robots positioning...... error is deterministic, and can as such be calibrated away. We have successfully used this innovation in our efforts for creating data sets for computer vision. Since the use of this innovation has a significant effect on the data set quality, we here present it in some detail, to better aid others...... in using robots for image data set generation....

  7. OVERUSE IN LEARNER LANGUAGE: FREQUENCY AND ACCURACY

    Directory of Open Access Journals (Sweden)

    Kamshilova, O.N.

    2017-09-01

    Full Text Available The investigation bases on the SPbEFL Learner Corpus findings and addresses the issue of overuse in learner output in relation to both frequency and accuracy of basic grammar structures. The article deals with two basic syntactic structures – S V Od and S V C with “be” as copula. The linguistic analysis concerns the choice of object in the first case and subject complement in the second. The objective is to show that overuse of the structures in question results not only in their frequency in learner production, but also in learner specific choice of their constituents.

  8. Graph theory

    CERN Document Server

    Diestel, Reinhard

    2017-01-01

    This standard textbook of modern graph theory, now in its fifth edition, combines the authority of a classic with the engaging freshness of style that is the hallmark of active mathematics. It covers the core material of the subject with concise yet reliably complete proofs, while offering glimpses of more advanced methods in each field by one or two deeper results, again with proofs given in full detail. The book can be used as a reliable text for an introductory course, as a graduate text, and for self-study. From the reviews: “This outstanding book cannot be substituted with any other book on the present textbook market. It has every chance of becoming the standard textbook for graph theory.”Acta Scientiarum Mathematiciarum “Deep, clear, wonderful. This is a serious book about the heart of graph theory. It has depth and integrity. ”Persi Diaconis & Ron Graham, SIAM Review “The book has received a very enthusiastic reception, which it amply deserves. A masterly elucidation of modern graph theo...

  9. Scattering theory

    CERN Document Server

    Friedrich, Harald

    2016-01-01

    This corrected and updated second edition of "Scattering Theory" presents a concise and modern coverage of the subject. In the present treatment, special attention is given to the role played by the long-range behaviour of the projectile-target interaction, and a theory is developed, which is well suited to describe near-threshold bound and continuum states in realistic binary systems such as diatomic molecules or molecular ions. It is motivated by the fact that experimental advances have shifted and broadened the scope of applications where concepts from scattering theory are used, e.g. to the field of ultracold atoms and molecules, which has been experiencing enormous growth in recent years, largely triggered by the successful realization of Bose-Einstein condensates of dilute atomic gases in 1995. The book contains sections on special topics such as near-threshold quantization, quantum reflection, Feshbach resonances and the quantum description of scattering in two dimensions. The level of abstraction is k...

  10. Curation accuracy of model organism databases.

    Science.gov (United States)

    Keseler, Ingrid M; Skrzypek, Marek; Weerasinghe, Deepika; Chen, Albert Y; Fulcher, Carol; Li, Gene-Wei; Lemmer, Kimberly C; Mladinich, Katherine M; Chow, Edmond D; Sherlock, Gavin; Karp, Peter D

    2014-01-01

    Manual extraction of information from the biomedical literature-or biocuration-is the central methodology used to construct many biological databases. For example, the UniProt protein database, the EcoCyc Escherichia coli database and the Candida Genome Database (CGD) are all based on biocuration. Biological databases are used extensively by life science researchers, as online encyclopedias, as aids in the interpretation of new experimental data and as golden standards for the development of new bioinformatics algorithms. Although manual curation has been assumed to be highly accurate, we are aware of only one previous study of biocuration accuracy. We assessed the accuracy of EcoCyc and CGD by manually selecting curated assertions within randomly chosen EcoCyc and CGD gene pages and by then validating that the data found in the referenced publications supported those assertions. A database assertion is considered to be in error if that assertion could not be found in the publication cited for that assertion. We identified 10 errors in the 633 facts that we validated across the two databases, for an overall error rate of 1.58%, and individual error rates of 1.82% for CGD and 1.40% for EcoCyc. These data suggest that manual curation of the experimental literature by Ph.D-level scientists is highly accurate. Database URL: http://ecocyc.org/, http://www.candidagenome.org//

  11. Accuracy of MR in growth plate measurement

    Energy Technology Data Exchange (ETDEWEB)

    Shiguetomi-Medina, Juan Manuel [Aarhus University, Orthopaedic Research Laboratory, Aarhus University Hospital NBG, Aarhus C (Denmark); Rahbek, Ole [Aarhus University Hospital NBG, Department of Children' s Orthopaedics, Aarhus C (Denmark); Ringgaard, Steffen; Kristiansen, Maja Sofie; Stoedkilde-Joergensen, Hans [Aarhus University Hospital, Skejby, The MR Research Center, Aarhus N (Denmark); Moeller-Madsen, Bjarne [Aarhus University, Orthopaedic Research Laboratory, Aarhus University Hospital NBG, Aarhus C (Denmark); Aarhus University Hospital NBG, Department of Children' s Orthopaedics, Aarhus C (Denmark)

    2014-09-15

    To analyze the accuracy of growth-plate thickness measurements detected on 1.5-T and 7-T MR images using histology sections as a standard of reference. Four defrosted pig tibiae were 1.5-T MR scanned and one fresh tibia was 7-T MR scanned. The height of the growth plate was measured and compared to histology. Histology measurements showed a mean growth plate thickness of 467 μm (SD = 82.2). The mean growth plate thickness measured in the 7-T MR images was 465 μm (SD = 62.2) and 1,325 μm (SD = 183.5) on 1.5-T MR measurements. We found a better correspondence between the growth plate thickness measured on the 7-T MR and histology samples compared to 1.5 T. The growth plate can be identified and measured with high accuracy using 7-T MR. 1.5-T MR can only describe some morphological characteristics. (orig.)

  12. Fast and High Accuracy Wire Scanner

    CERN Document Server

    Koujili, M; Koopman, J; Ramos, D; Sapinski, M; De Freitas, J; Ait Amira, Y; Djerdir, A

    2009-01-01

    Scanning of a high intensity particle beam imposes challenging requirements on a Wire Scanner system. It is expected to reach a scanning speed of 20 m.s-1 with a position accuracy of the order of 1 μm. In addition a timing accuracy better than 1 millisecond is needed. The adopted solution consists of a fork holding a wire rotating by a maximum of 200°. Fork, rotor and angular position sensor are mounted on the same axis and located in a chamber connected to the beam vacuum. The requirements imply the design of a system with extremely low vibration, vacuum compatibility, radiation and temperature tolerance. The adopted solution consists of a rotary brushless synchronous motor with the permanent magnet rotor installed inside of the vacuum chamber and the stator installed outside. The accurate position sensor will be mounted on the rotary shaft inside of the vacuum chamber, has to resist a bake-out temperature of 200°C and ionizing radiation up to a dozen of kGy/year. A digital feedback controller allows maxi...

  13. Approaching Chemical Accuracy with Quantum Monte Carlo

    CERN Document Server

    Petruzielo, F R; Umrigar, C J

    2012-01-01

    A quantum Monte Carlo study of the atomization energies for the G2 set of molecules is presented. Basis size dependence of diffusion Monte Carlo atomization energies is studied with a single determinant Slater-Jastrow trial wavefunction formed from Hartree-Fock orbitals. With the largest basis set, the mean absolute deviation from experimental atomization energies for the G2 set is 3.0 kcal/mol. Optimizing the orbitals within variational Monte Carlo improves the agreement between diffusion Monte Carlo and experiment, reducing the mean absolute deviation to 2.1 kcal/mol. Moving beyond a single determinant Slater-Jastrow trial wavefunction, diffusion Monte Carlo with a small complete active space Slater-Jastrow trial wavefunction results in near chemical accuracy. In this case, the mean absolute deviation from experimental atomization energies is 1.2 kcal/mol. It is shown from calculations on systems containing phosphorus that the accuracy can be further improved by employing a larger active space.

  14. Dimensional accuracy of 3D printed vertebra

    Science.gov (United States)

    Ogden, Kent; Ordway, Nathaniel; Diallo, Dalanda; Tillapaugh-Fay, Gwen; Aslan, Can

    2014-03-01

    3D printer applications in the biomedical sciences and medical imaging are expanding and will have an increasing impact on the practice of medicine. Orthopedic and reconstructive surgery has been an obvious area for development of 3D printer applications as the segmentation of bony anatomy to generate printable models is relatively straightforward. There are important issues that should be addressed when using 3D printed models for applications that may affect patient care; in particular the dimensional accuracy of the printed parts needs to be high to avoid poor decisions being made prior to surgery or therapeutic procedures. In this work, the dimensional accuracy of 3D printed vertebral bodies derived from CT data for a cadaver spine is compared with direct measurements on the ex-vivo vertebra and with measurements made on the 3D rendered vertebra using commercial 3D image processing software. The vertebra was printed on a consumer grade 3D printer using an additive print process using PLA (polylactic acid) filament. Measurements were made for 15 different anatomic features of the vertebral body, including vertebral body height, endplate width and depth, pedicle height and width, and spinal canal width and depth, among others. It is shown that for the segmentation and printing process used, the results of measurements made on the 3D printed vertebral body are substantially the same as those produced by direct measurement on the vertebra and measurements made on the 3D rendered vertebra.

  15. Enhancing Accuracy of Plant Leaf Classification Techniques

    Directory of Open Access Journals (Sweden)

    C. S. Sumathi

    2014-03-01

    Full Text Available Plants have become an important source of energy, and are a fundamental piece in the puzzle to solve the problem of global warming. Living beings also depend on plants for their food, hence it is of great importance to know about the plants growing around us and to preserve them. Automatic plant leaf classification is widely researched. This paper investigates the efficiency of learning algorithms of MLP for plant leaf classification. Incremental back propagation, Levenberg–Marquardt and batch propagation learning algorithms are investigated. Plant leaf images are examined using three different Multi-Layer Perceptron (MLP modelling techniques. Back propagation done in batch manner increases the accuracy of plant leaf classification. Results reveal that batch training is faster and more accurate than MLP with incremental training and Levenberg– Marquardt based learning for plant leaf classification. Various levels of semi-batch training used on 9 species of 15 sample each, a total of 135 instances show a roughly linear increase in classification accuracy.

  16. Accuracy of magnetic resonance based susceptibility measurements

    Science.gov (United States)

    Erdevig, Hannah E.; Russek, Stephen E.; Carnicka, Slavka; Stupic, Karl F.; Keenan, Kathryn E.

    2017-05-01

    Magnetic Resonance Imaging (MRI) is increasingly used to map the magnetic susceptibility of tissue to identify cerebral microbleeds associated with traumatic brain injury and pathological iron deposits associated with neurodegenerative diseases such as Parkinson's and Alzheimer's disease. Accurate measurements of susceptibility are important for determining oxygen and iron content in blood vessels and brain tissue for use in noninvasive clinical diagnosis and treatment assessments. Induced magnetic fields with amplitude on the order of 100 nT, can be detected using MRI phase images. The induced field distributions can then be inverted to obtain quantitative susceptibility maps. The focus of this research was to determine the accuracy of MRI-based susceptibility measurements using simple phantom geometries and to compare the susceptibility measurements with magnetometry measurements where SI-traceable standards are available. The susceptibilities of paramagnetic salt solutions in cylindrical containers were measured as a function of orientation relative to the static MRI field. The observed induced fields as a function of orientation of the cylinder were in good agreement with simple models. The MRI susceptibility measurements were compared with SQUID magnetometry using NIST-traceable standards. MRI can accurately measure relative magnetic susceptibilities while SQUID magnetometry measures absolute magnetic susceptibility. Given the accuracy of moment measurements of tissue mimicking samples, and the need to look at small differences in tissue properties, the use of existing NIST standard reference materials to calibrate MRI reference structures is problematic and better reference materials are required.

  17. The IBIS / ISGRI Source Location Accuracy

    CERN Document Server

    Gros, A; Soldi, S; Gotz, D; Caballero, I; Mattana, F; Heras, J A Zurita

    2013-01-01

    We present here results on the source location accuracy of the INTEGRAL IBIS/ISGRI coded mask telescope, based on ten years of INTEGRAL data and on recent developments in the data analysis procedures. Data were selected and processed with the new Off-line Scientific Analysis pipeline (OSA10.0) that benefits from the most accurate background corrections, the most performing coding noise cleaning and sky reconstruction algorithms available. We obtained updated parameters for the evaluation of the point source location error from the source signal to noise ratio. These results are compared to previous estimates and to theoretical expectations. Also thanks to a new fitting procedure the typical error at 90% confidence level for a source at a signal to noise of 10 is now estimated to be 1.5 arcmin. Prospects for future analysis on the Point Spread Function fitting procedure and on the evaluation of residual biases are also presented. The new consolidated parameters describing the source location accuracy that will...

  18. Evaluation of the shear bond strength of the union between two CoCr-alloys and a dental ceramic Avaliação da resistência ao cisalhamento da união entre duas ligas a base de CoCr e uma cerâmica

    Directory of Open Access Journals (Sweden)

    Mariana Pretti

    2004-12-01

    Full Text Available INTRODUCTION: Based on the importance of the integrity of the metal/ceramic interface, the purpose of this work was to evaluate the shear bond strength of the metal-ceramic union of two Co-Cr alloys (Wirobond C, Bego; Remanium 2000, Dentaurum combined with Omega 900 ceramic (Vita Zahnfabrik. MATERIAL AND METHOD: Eleven cylindrical matrixes were made for each alloy, and the metallic portion was obtained with the lost wax casting technique with standardized waxing of 4mm of height and of 4mm of diameter. The ceramic was applied according to the manufacturer's recommendations with the aid of a teflon matrix that allowed its dimension to be standardized in the same size as the metallic portion. The specimens were submitted to the shear bond test in an universal testing machine (EMIC, with the aid of a device developed for such intention, and constant speed of 0.5mm/min. RESULTS AND CONCLUSIONS: The mean resistance was 48.387MPa for Wirobond C alloy, with standard deviation of 17.718, and 55.956MPa for Remanium 2000, with standard deviation of 17.198. No statistically significant difference was observed between the shear strength of the two metal-ceramic alloys.INTRODUÇÃO: Baseados na importância da integridade da interface metal-cerâmica, este trabalho tem como objetivo avaliar a resistência ao cisalhamento da união metal-cerâmica de duas ligas de Co-Cr (Wirobond C, Bego; Remanium 2000, Dentaurum combinadas com a cerâmica Omega 900 (Vita Zahnfabrik. MATERIAIS E MÉTODOS: Foram confeccionados 11 corpos-de-prova cilíndricos para cada liga utilizada, sendo que a porção metálica foi obtida por fundição pela técnica da cera perdida, através de enceramentos padronizados com 4mm de altura por 4mm de diâmetro. A aplicação da cerâmica foi realizada segundo recomendações do fabricante, com auxílio de uma matriz de teflon que permitia sua padronização com as mesmas dimensões da porção metálica. Os corpos-de-prova foram submetidos

  19. A crise da Liga das Nações de 1926: realismo neoclássico, multilateralismo e a natureza da política externa brasileira The League of Nations crisis of 1926: neoclassical realism, multilateralism, and the nature of Brazilian foreign policy

    Directory of Open Access Journals (Sweden)

    Braz Baracuhy

    2006-12-01

    Full Text Available O artigo analisa a natureza da política externa brasileira na crise da Liga das Nações (1926, a partir de modelo teórico do realismo neoclássico. As dinâmicas por posições de poder nos tabuleiros geopolítico e multilateral do sistema internacional e as percepções e estratégias diplomáticas da elite de política externa brasileira são consideradas no estudo teórico.The article analyzes the nature of Brazilian foreign policy in the crisis of the League of Nations (1926 from a neoclassical-realist theoretical perspective. Within this theoretical framework, the dynamics of power positioning in the geopolitical and multilateral chessboards of the international system and the perceptions and diplomatic strategies of the Brazilian foreign-policy elite are taken into account.

  20. Relação funcional entre a proteína Bub3 do checkpoint mitótico e a proteína motora dineína na ligação cinetocoro-microtúbulos

    OpenAIRE

    Silva, Patrícia Manuela Areias da

    2011-01-01

    O checkpoint mitótico assegura a fidelidade da segregação cromossómica a cada divisão celular. Este mecanismo de controlo inibe a anafase até que todos os cromossomas estabeleçam uma ligação bipolar, através dos seus cinetocoros irmãos, com os microtúbulos provenientes de pólos opostos do fuso mitótico, culminando no seu alinhamento na placa metafásica, fenómeno designado de congressão. Algumas das proteínas do checkpoint mitótico, designadamente Bub1, BubR1 e Bub3, para alé...

  1. Avaliação da resistência à corrosão de eletrodepósitos de liga ZnFe sobre aço tratado com filmes contendo sais de terras raras e silanos BTSE, BTESPTS

    OpenAIRE

    2013-01-01

    O presente trabalho tem como objetivo avaliar a resistência a corrosão do aço revestido com eletrodepósito de liga ZnFe tratado com filmes constituídos de uma pré-camada obtida através de solução de sais de terras raras (Ce ou La) acrescida de filmes de silanos bis 1,2-[trietoxissilil]etano) (BTSE) e/ou bis-(3-[trietoxissilil]-propil) - tetrassulfeto (BTESPTS). Esses sistemas foram avaliados através das Curvas de Polarização, Espectroscopia de Impedância Eletroquímica (EIE), M...

  2. Cosmic microwave background theory.

    Science.gov (United States)

    Bond, J R

    1998-01-06

    A long-standing goal of theorists has been to constrain cosmological parameters that define the structure formation theory from cosmic microwave background (CMB) anisotropy experiments and large-scale structure (LSS) observations. The status and future promise of this enterprise is described. Current band-powers in -space are consistent with a DeltaT flat in frequency and broadly follow inflation-based expectations. That the levels are approximately (10(-5))2 provides strong support for the gravitational instability theory, while the Far Infrared Absolute Spectrophotometer (FIRAS) constraints on energy injection rule out cosmic explosions as a dominant source of LSS. Band-powers at 100 suggest that the universe could not have re-ionized too early. To get the LSS of Cosmic Background Explorer (COBE)-normalized fluctuations right provides encouraging support that the initial fluctuation spectrum was not far off the scale invariant form that inflation models prefer: e.g., for tilted Lambda cold dark matter sequences of fixed 13-Gyr age (with the Hubble constant H0 marginalized), ns = 1.17 +/- 0.3 for Differential Microwave Radiometer (DMR) only; 1.15 +/- 0.08 for DMR plus the SK95 experiment; 1.00 +/- 0.04 for DMR plus all smaller angle experiments; 1.00 +/- 0.05 when LSS constraints are included as well. The CMB alone currently gives weak constraints on Lambda and moderate constraints on Omegatot, but theoretical forecasts of future long duration balloon and satellite experiments are shown which predict percent-level accuracy among a large fraction of the 10+ parameters characterizing the cosmic structure formation theory, at least if it is an inflation variant.

  3. Recobrimento da liga Ti-6Al-4V com hidroxiapatita pelo método sol-gel e sua aplicação a hastes femorais não-cimentadas Coating of Ti-6Al-4V alloy with hydroxyapatite by using sol-gel method and its application to non-cemented femoral stem

    Directory of Open Access Journals (Sweden)

    E. P. Avés

    2008-12-01

    Full Text Available O recobrimento de ligas metálicas com cerâmicas bioativas visa acelerar a formação óssea ao redor do implante, contribuindo para a sua estabilização. Neste trabalho estudou-se a fase cerâmica de hidroxiapatita depositada pelo processo sol-gel em chapas da liga metálica Ti-6Al-4V. A camada de recobrimento foi caracterizada por microscopia eletrônica de varredura, por difração de raios X e sua adesão ao substrato foi avaliada pelo teste de cisalhamento O teste de citocompatibilidade mostrou que o processo de recobrimento por sol-gel não promoveu morte celular significativamente maior que o controle (p > 0,05. Além disso, hastes femorais removidas de pacientes (explantes foram adequadamente recobertas utilizando-se o processo sol-gel.The coating of metallic alloys with bioactive ceramics aims to accelerate bone formation around the implant, contributing to its fixation. In this paper, the deposition of hydroxyapatite ceramic on Ti-6Al-4V alloy sheets by the sol-gel method was studied. The coating layer was characterized by scanning electron microscopy, X-ray diffraction and its adhesion to substrate was evaluated by shear testing. The citocompatibility test shows that the sol-gel coating did not provoke the cell death significantly higher than the control (p > 0.05. Moreover, femoral stems removed from patient (explants were adequately coated using the sol-gel process.

  4. Residuation theory

    CERN Document Server

    Blyth, T S; Sneddon, I N; Stark, M

    1972-01-01

    Residuation Theory aims to contribute to literature in the field of ordered algebraic structures, especially on the subject of residual mappings. The book is divided into three chapters. Chapter 1 focuses on ordered sets; directed sets; semilattices; lattices; and complete lattices. Chapter 2 tackles Baer rings; Baer semigroups; Foulis semigroups; residual mappings; the notion of involution; and Boolean algebras. Chapter 3 covers residuated groupoids and semigroups; group homomorphic and isotone homomorphic Boolean images of ordered semigroups; Dubreil-Jacotin and Brouwer semigroups; and loli

  5. Graph theory

    CERN Document Server

    Diestel, Reinhard

    2012-01-01

    HauptbeschreibungThis standard textbook of modern graph theory, now in its fourth edition, combinesthe authority of a classic with the engaging freshness of style that is the hallmarkof active mathematics. It covers the core material of the subject with concise yetreliably complete proofs, while offering glimpses of more advanced methodsin each field by one or two deeper results, again with proofs given in full detail.The book can be used as a reliable text for an introductory course, as a graduatetext, and for self-study. Rezension"Deep, clear, wonderful. This is a serious book about the

  6. Design theory

    CERN Document Server

    2009-01-01

    This book deals with the basic subjects of design theory. It begins with balanced incomplete block designs, various constructions of which are described in ample detail. In particular, finite projective and affine planes, difference sets and Hadamard matrices, as tools to construct balanced incomplete block designs, are included. Orthogonal latin squares are also treated in detail. Zhu's simpler proof of the falsity of Euler's conjecture is included. The construction of some classes of balanced incomplete block designs, such as Steiner triple systems and Kirkman triple systems, are also given.

  7. Communication theory

    CERN Document Server

    Goldie, Charles M

    1991-01-01

    This book is an introduction, for mathematics students, to the theories of information and codes. They are usually treated separately but, as both address the problem of communication through noisy channels (albeit from different directions), the authors have been able to exploit the connection to give a reasonably self-contained treatment, relating the probabilistic and algebraic viewpoints. The style is discursive and, as befits the subject, plenty of examples and exercises are provided. Some examples and exercises are provided. Some examples of computer codes are given to provide concrete illustrations of abstract ideas.

  8. Graph theory

    CERN Document Server

    Merris, Russell

    2001-01-01

    A lively invitation to the flavor, elegance, and power of graph theoryThis mathematically rigorous introduction is tempered and enlivened by numerous illustrations, revealing examples, seductive applications, and historical references. An award-winning teacher, Russ Merris has crafted a book designed to attract and engage through its spirited exposition, a rich assortment of well-chosen exercises, and a selection of topics that emphasizes the kinds of things that can be manipulated, counted, and pictured. Intended neither to be a comprehensive overview nor an encyclopedic reference, th

  9. Accuracy of the vivofit activity tracker.

    Science.gov (United States)

    Alsubheen, Sana'a A; George, Amanda M; Baker, Alicia; Rohr, Linda E; Basset, Fabien A

    2016-08-01

    The purpose of this study was to examine the accuracy of the vivofit activity tracker in assessing energy expenditure and step count. Thirteen participants wore the vivofit activity tracker for five days. Participants were required to independently perform 1 h of self-selected activity each day of the study. On day four, participants came to the lab to undergo BMR and a treadmill-walking task (TWT). On day five, participants completed 1 h of office-type activities. BMR values estimated by the vivofit were not significantly different from the values measured through indirect calorimetry (IC). The vivofit significantly underestimated EE for treadmill walking, but responded to the differences in the inclination. Vivofit underestimated step count for level walking but provided an accurate estimate for incline walking. There was a strong correlation between EE and the exercise intensity. The vivofit activity tracker is on par with similar devices and can be used to track physical activity.

  10. Quantitative code accuracy evaluation of ISP33

    Energy Technology Data Exchange (ETDEWEB)

    Kalli, H.; Miwrrin, A. [Lappeenranta Univ. of Technology (Finland); Purhonen, H. [VTT Energy, Lappeenranta (Finland)] [and others

    1995-09-01

    Aiming at quantifying code accuracy, a methodology based on the Fast Fourier Transform has been developed at the University of Pisa, Italy. The paper deals with a short presentation of the methodology and its application to pre-test and post-test calculations submitted to the International Standard Problem ISP33. This was a double-blind natural circulation exercise with a stepwise reduced primary coolant inventory, performed in PACTEL facility in Finland. PACTEL is a 1/305 volumetrically scaled, full-height simulator of the Russian type VVER-440 pressurized water reactor, with horizontal steam generators and loop seals in both cold and hot legs. Fifteen foreign organizations participated in ISP33, with 21 blind calculations and 20 post-test calculations, altogether 10 different thermal hydraulic codes and code versions were used. The results of the application of the methodology to nine selected measured quantities are summarized.

  11. Prognostic Accuracy of Electroencephalograms in Preterm Infants

    DEFF Research Database (Denmark)

    Fogtmann, Emilie Pi; Plomgaard, Anne Mette; Greisen, Gorm;

    2017-01-01

    (267 infants). Any aEEG background abnormality was a predictor of abnormal outcome. For prediction of a developmental quotient ...CONTEXT: Brain injury is common in preterm infants, and predictors of neurodevelopmental outcome are relevant. OBJECTIVE: To assess the prognostic test accuracy of the background activity of the EEG recorded as amplitude-integrated EEG (aEEG) or conventional EEG early in life in preterm infants...... for predicting neurodevelopmental outcome. DATA SOURCES: The Cochrane Library, PubMed, Embase, and the Cumulative Index to Nursing and Allied Health Literature. STUDY SELECTION: We included observational studies that had obtained an aEEG or EEG within 7 days of life in preterm infants and reported...

  12. Accuracy analysis of a spectral Poisson solver

    Energy Technology Data Exchange (ETDEWEB)

    Rambaldi, S. [Dipartimento di Fisica Universita di Bologna and INFN, Bologna, Via Irnerio 46, 40126 (Italy)]. E-mail: rambaldi@bo.infn.it; Turchetti, G. [Dipartimento di Fisica Universita di Bologna and INFN, Bologna, Via Irnerio 46, 40126 (Italy); Benedetti, C. [Dipartimento di Fisica Universita di Bologna and INFN, Bologna, Via Irnerio 46, 40126 (Italy); Mattioli, F. [Dipartimento di Fisica Universita di Bologna, Bologna, Via Irnerio 46, 40126 (Italy); Franchi, A. [GSI, Darmstadt, Planckstr. 1, 64291 (Germany)

    2006-06-01

    We solve Poisson's equation in d=2,3 space dimensions by using a spectral method based on Fourier decomposition. The choice of the basis implies that Dirichlet boundary conditions on a box are satisfied. A Green's function-based procedure allows us to impose Dirichlet conditions on any smooth closed boundary, by doubling the computational complexity. The error introduced by the spectral truncation and the discretization of the charge distribution is evaluated by comparison with the exact solution, known in the case of elliptical symmetry. To this end boundary conditions on an equipotential ellipse (ellipsoid) are imposed on the numerical solution. Scaling laws for the error dependence on the number K of Fourier components for each space dimension and the number N of point charges used to simulate the charge distribution are presented and tested. A procedure to increase the accuracy of the method in the beam core region is briefly outlined.

  13. Stereotype accuracy of ballet and modern dancers.

    Science.gov (United States)

    Clabaugh, Alison; Morling, Beth

    2004-02-01

    The authors recorded preprofessional ballet and modern dancers' perceptions of the personality traits of each type of dancer and self-reports of their own standing, to test the accuracy of the group stereotypes. Participants accurately stereotyped ballet dancers as scoring higher than modern dancers on Fear of Negative Evaluation and Personal Need for Structure and accurately viewed the groups as equal on Fitness Esteem. Participants inaccurately stereotyped ballet dancers as lower on Body Esteem; the groups actually scored the same. Sensitivity correlations across traits indicated that dancers were accurate about the relative magnitudes of trait differences in the two types of dancers. A group of nondancers reported stereotypes that were usually in the right direction although of inaccurate magnitude, and nondancers were sensitive to the relative sizes of group differences across traits.

  14. High accuracy 3-D laser radar

    DEFF Research Database (Denmark)

    Busck, Jens; Heiselberg, Henning

    2004-01-01

    We have developed a mono-static staring 3-D laser radar based on gated viewing with range accuracy below 1 m at 10 m and 1 cm at 100. We use a high sensitivity, fast, intensified CCD camera, and a Nd:Yag passively Q-switched 32.4 kHz pulsed green laser at 532 nm. The CCD has 752x582 pixels. Camera...... shutter is controlled in steps of 100 ps. Camera delay is controlled in steps of 100 ps. Each laser pulse triggers the camera delay and shutter. A 3-D image is constructed from a sequence of 50-100 2-D reflectivity images, where each frame integrates about 700 laser pulses on the CCD. In 50 Hz video mode...

  15. Human Speed-Accuracy Tradeoffs in Search

    CERN Document Server

    Aperjis, Christina; Wu, Fang

    2010-01-01

    When foraging for information, users face a tradeoff between the accuracy and value of the acquired information and the time spent collecting it, a problem which also surfaces when seeking answers to a question posed to a large community. We empirically study how people behave when facing these conflicting objectives using data from Yahoo Answers, a community driven question-and-answer site. We first study how users behave when trying to maximize the amount of acquired information while minimizing the waiting time. We find that users are willing to wait longer for an additional answer if they have received a small number of answers. We then assume that users make a sequence of decisions, deciding to wait for an additional answer as long as the quality of the current answer exceeds some threshold. The resulting probability distribution for the number of answers that a question gets is an inverse Gaussian, a fact that is validated by our data.

  16. Moyamoya disease: diagnostic accuracy of MRI.

    Science.gov (United States)

    Yamada, I; Suzuki, S; Matsushima, Y

    1995-07-01

    Our purpose was to evaluate the diagnostic accuracy of MRI in moyamoya disease. We studied 30 patients with this disease, comparing MRI and angiographic findings. The diagnostic value of MRI was evaluated for occlusive lesions, collateral vessels, and parenchymal lesions. In all patients bilateral occlusion or stenosis of the supraclinoid internal carotid artery and proximal anterior and middle cerebral arteries was clearly shown by MRI, and staging of the extent of occlusion agreed with angiographic staging in 44 (73%) of 60 arteries. MRI, particularly coronal images, clearly showed basal cerebral moyamoya vessels in 54 hemispheres, and 45 of a total of 71 large leptomeningeal and transdural collateral vessels were identified. MRI also showed parenchymal lesions in 48 (80%) hemispheres, and the extent of occlusion in the anterior and posterior circulations respectively correlated with white matter and cortical and/or subcortical infarcts.

  17. Improved accuracy in nano beam electron diffraction

    Energy Technology Data Exchange (ETDEWEB)

    Beche, A; Rouviere, J-L [CEA, INAC, SP2M, LEMMA, 17 rue des Martyrs, F-38054 Grenoble Cedex 9 (France); Clement, L, E-mail: armand.beche@cea.f, E-mail: jean-luc.rouviere@cea.f [ST Microelectronics, 850 rue Jean Monnet, F-38920 Crolles (France)

    2010-02-01

    Nano beam electron diffraction (NBD or NBED) is applied on a well controlled sample in order to evaluate the limit of the technique to measure strain. Measurements are realised on a 27nm thick Si{sub 0.7}Ge{sub 0.3} layer embedded in a silicon matrix, with a TITAN microscope working at 300kV. Using a standard condenser aperture of 50{mu}m, a probe size diameter of 2.7 nm is obtained and a strain accuracy of 6x10{sup -4} (mean root square, rms) is achieved. NBED patterns are acquired along a [110] direction and the bidimensionnal strain in the (110) plane is measured. Finite element simulations are carried out to check experimental results and reveal that strain relaxation and probe averaging in a 170nm thick TEM lamella reduces strain by 15%.

  18. On the accuracy of the Debye shielding

    CERN Document Server

    Martínez-Fuentes, M A

    2012-01-01

    The expression for the Debye shielding in plasma physics is usually derived under the assumptions that the plasma particles are weakly coupled, so their kinetic energy is much larger than the potential energy between them, and that the velocity distributions of the plasma species are Maxwellian. The first assumption also establishes that the plasma parameter ND, the number of particles within a sphere with a Debye radius should be greater than 1, and determines the difference between weakly and strongly coupled plasmas. Under such assumptions, Poisson's equation can be linearised, and a simple analytic expression obtained for the electrostatic potential. However, textbooks rarely discuss the accuracy of this approximation. In this work we compare the linearised solution with the exact one, obtained numerically, and show that the linearisation, which underestimates the exact solution, is reasonably good even for ND ~ 40. We give quantitative criteria to set the limit of the approximation when the number of par...

  19. Methodology for high accuracy contact angle measurement.

    Science.gov (United States)

    Kalantarian, A; David, R; Neumann, A W

    2009-12-15

    A new version of axisymmetric drop shape analysis (ADSA) called ADSA-NA (ADSA-no apex) was developed for measuring interfacial properties for drop configurations without an apex. ADSA-NA facilitates contact angle measurements on drops with a capillary protruding into the drop. Thus a much simpler experimental setup, not involving formation of a complete drop from below through a hole in the test surface, may be used. The contact angles of long-chained alkanes on a commercial fluoropolymer, Teflon AF 1600, were measured using the new method. A new numerical scheme was incorporated into the image processing to improve the location of the contact points of the liquid meniscus with the solid substrate to subpixel resolution. The images acquired in the experiments were also analyzed by a different drop shape technique called theoretical image fitting analysis-axisymmetric interfaces (TIFA-AI). The results were compared with literature values obtained by means of the standard ADSA for sessile drops with the apex. Comparison of the results from ADSA-NA with those from TIFA-AI and ADSA reveals that, with different numerical strategies and experimental setups, contact angles can be measured with an accuracy of less than 0.2 degrees. Contact angles and surface tensions measured from drops with no apex, i.e., by means of ADSA-NA and TIFA-AI, were considerably less scattered than those from complete drops with apex. ADSA-NA was also used to explore sources of improvement in contact angle resolution. It was found that using an accurate value of surface tension as an input enhances the accuracy of contact angle measurements.

  20. Improving the accuracy of death certification

    Science.gov (United States)

    Myers, K A; Farquhar, D R

    1998-01-01

    BACKGROUND: Population-based mortality statistics are derived from the information recorded on death certificates. This information is used for many important purposes, such as the development of public health programs and the allocation of health care resources. Although most physicians are confronted with the task of completing death certificates, many do not receive adequate training in this skill. Resulting inaccuracies in information undermine the quality of the data derived from death certificates. METHODS: An educational intervention was designed and implemented to improve internal medicine residents' accuracy in death certificate completion. A total of 229 death certificates (146 completed before and 83 completed after the intervention) were audited for major and minor errors, and the rates of errors before and after the intervention were compared. RESULTS: Major errors were identified on 32.9% of the death certificates completed before the intervention, a rate comparable to previously reported rates for internal medicine services in teaching hospitals. Following the intervention the major error rate decreased to 15.7% (p = 0.01). The reduction in the major error rate was accounted for by significant reductions in the rate of listing of mechanism of death without a legitimate underlying cause of death (15.8% v. 4.8%) (p = 0.01) and the rate of improper sequencing of death certificate information (15.8% v. 6.0%) (p = 0.03). INTERPRETATION: Errors are common in the completion of death certificates in the inpatient teaching hospital setting. The accuracy of death certification can be improved with the implementation of a simple educational intervention. PMID:9614825

  1. Accuracy of anemia diagnosis by physical examination

    Directory of Open Access Journals (Sweden)

    Isabela Martins Benseñor

    Full Text Available CONTEXT AND OBJECTIVES: Quantification of clinical signs such as the presence or absence of pallor at clinical examination is a key step for making diagnoses. The aim was, firstly, to evaluate two methods for anemia diagnosis by physical examination: four-level evaluation (crosses method: +/++/+++/++++ and estimated hemoglobin values, both performed by medical students and staff physicians; and secondly, to investigate whether there was any improvement in assessment accuracy according to the number of years in clinical practice. DESIGN AND SETTING: Forty-four randomly selected physicians and medical students in a tertiary care teaching hospital completed a physical examination on five patients with mild to severe anemia. METHODS: The observers used four-level evaluation and also predicted the hemoglobin level. Both methods were compared with the real hemoglobin value as the gold standard. RESULTS: The mean estimated hemoglobin value correlated better with the real hemoglobin values than did the four-level evaluation method, for attending physicians, residents and students (Spearman's correlation coefficients, respectively: 1.0, 1.0 and 0.9 for guessed hemoglobin and -0.8, -0.8 and -0.7 for the four-level evaluation method. There were no differences in the mean "guessed" hemoglobin values from attending physicians, residents and students. However, the correlation between guessed hemoglobin value and the four-level method was positive for attending physicians, thus suggesting some kind of improvement with time (p = 0.04. CONCLUSIONS: This study showed that estimated hemoglobin was more accurate than evaluation by the four-level method. The number of years in clinical practice did not improve the accuracy of clinical examination for anemia.

  2. Dosimetric accuracy of a staged radiosurgery treatment

    Science.gov (United States)

    Cernica, George; de Boer, Steven F.; Diaz, Aidnag; Fenstermaker, Robert A.; Podgorsak, Matthew B.

    2005-05-01

    For large cerebral arteriovenous malformations (AVMs), the efficacy of radiosurgery is limited since the large doses necessary to produce obliteration may increase the risk of radiation necrosis to unacceptable levels. An alternative is to stage the radiosurgery procedure over multiple stages (usually two), effectively irradiating a smaller volume of the AVM nidus with a therapeutic dose during each session. The difference between coordinate systems defined by sequential stereotactic frame placements can be represented by a translation and a rotation. A unique transformation can be determined based on the coordinates of several fiducial markers fixed to the skull and imaged in each stereotactic coordinate system. Using this transformation matrix, isocentre coordinates from the first stage can be displayed in the coordinate system of subsequent stages allowing computation of a combined dose distribution covering the entire AVM. The accuracy of this approach was tested on an anthropomorphic head phantom and was verified dosimetrically. Subtle defects in the phantom were used as control points, and 2 mm diameter steel balls attached to the surface were used as fiducial markers and reference points. CT images (2 mm thick) were acquired. Using a transformation matrix developed with two frame placements, the predicted locations of control and reference points had an average error of 0.6 mm near the fiducial markers and 1.0 mm near the control points. Dose distributions in a staged treatment approach were accurately calculated using the transformation matrix. This approach is simple, fast and accurate. Errors were small and clinically acceptable for Gamma Knife radiosurgery. Accuracy can be improved by reducing the CT slice thickness.

  3. Dosimetric accuracy of a staged radiosurgery treatment

    Energy Technology Data Exchange (ETDEWEB)

    Cernica, George [Department of Physics, State University of New York at Buffalo, Buffalo, NY 14263 (United States); Boer, Steven F de [Department of Radiation Oncology, Roswell Park Cancer Institute and the State University of New York at Buffalo, Buffalo, NY 14263 (United States); Diaz, Aidnag [Department of Radiation Oncology, Roswell Park Cancer Institute and the State University of New York at Buffalo, Buffalo, NY 14263 (United States); Fenstermaker, Robert A [Department of Neurosurgery, Roswell Park Cancer Institute and the State University of New York at Buffalo, Buffalo, NY 14263 (United States); Podgorsak, Matthew B [Department of Radiation Oncology, Roswell Park Cancer Institute and the State University of New York at Buffalo, Buffalo, NY 14263 (United States)

    2005-05-07

    For large cerebral arteriovenous malformations (AVMs), the efficacy of radiosurgery is limited since the large doses necessary to produce obliteration may increase the risk of radiation necrosis to unacceptable levels. An alternative is to stage the radiosurgery procedure over multiple stages (usually two), effectively irradiating a smaller volume of the AVM nidus with a therapeutic dose during each session. The difference between coordinate systems defined by sequential stereotactic frame placements can be represented by a translation and a rotation. A unique transformation can be determined based on the coordinates of several fiducial markers fixed to the skull and imaged in each stereotactic coordinate system. Using this transformation matrix, isocentre coordinates from the first stage can be displayed in the coordinate system of subsequent stages allowing computation of a combined dose distribution covering the entire AVM. The accuracy of this approach was tested on an anthropomorphic head phantom and was verified dosimetrically. Subtle defects in the phantom were used as control points, and 2 mm diameter steel balls attached to the surface were used as fiducial markers and reference points. CT images (2 mm thick) were acquired. Using a transformation matrix developed with two frame placements, the predicted locations of control and reference points had an average error of 0.6 mm near the fiducial markers and 1.0 mm near the control points. Dose distributions in a staged treatment approach were accurately calculated using the transformation matrix. This approach is simple, fast and accurate. Errors were small and clinically acceptable for Gamma Knife radiosurgery. Accuracy can be improved by reducing the CT slice thickness.

  4. Estimating the accuracy of geographical imputation

    Directory of Open Access Journals (Sweden)

    Boscoe Francis P

    2008-01-01

    Full Text Available Abstract Background To reduce the number of non-geocoded cases researchers and organizations sometimes include cases geocoded to postal code centroids along with cases geocoded with the greater precision of a full street address. Some analysts then use the postal code to assign information to the cases from finer-level geographies such as a census tract. Assignment is commonly completed using either a postal centroid or by a geographical imputation method which assigns a location by using both the demographic characteristics of the case and the population characteristics of the postal delivery area. To date no systematic evaluation of geographical imputation methods ("geo-imputation" has been completed. The objective of this study was to determine the accuracy of census tract assignment using geo-imputation. Methods Using a large dataset of breast, prostate and colorectal cancer cases reported to the New Jersey Cancer Registry, we determined how often cases were assigned to the correct census tract using alternate strategies of demographic based geo-imputation, and using assignments obtained from postal code centroids. Assignment accuracy was measured by comparing the tract assigned with the tract originally identified from the full street address. Results Assigning cases to census tracts using the race/ethnicity population distribution within a postal code resulted in more correctly assigned cases than when using postal code centroids. The addition of age characteristics increased the match rates even further. Match rates were highly dependent on both the geographic distribution of race/ethnicity groups and population density. Conclusion Geo-imputation appears to offer some advantages and no serious drawbacks as compared with the alternative of assigning cases to census tracts based on postal code centroids. For a specific analysis, researchers will still need to consider the potential impact of geocoding quality on their results and evaluate

  5. Surgical accuracy of three-dimensional virtual planning

    DEFF Research Database (Denmark)

    Stokbro, Kasper; Aagaard, Esben; Torkov, Peter

    2016-01-01

    This retrospective study evaluated the precision and positional accuracy of different orthognathic procedures following virtual surgical planning in 30 patients. To date, no studies of three-dimensional virtual surgical planning have evaluated the influence of segmentation on positional accuracy ...

  6. Accuracy Assessment Points for Voyageurs National Park Vegetation Mapping Project

    Data.gov (United States)

    National Park Service, Department of the Interior — Thematic accuracy requirements for the USGS-NPS Vegetation Mapping Program specify 80% accuracy for each map unit that represents USNVC floristic types. A total of...

  7. A SINGLE STEP SCHEME WITH HIGH ACCURACY FOR PARABOLIC PROBLEM

    Institute of Scientific and Technical Information of China (English)

    陈传淼; 胡志刚

    2001-01-01

    A single step scheme with high accuracy for solving parabolic problem is proposed. It is shown that this scheme possesses good stability and fourth order accuracy with respect to both time and space variables, which are superconvergent.

  8. Accuracy Assessment Points for Tuzigoot National Monument Vegetation Mapping Project

    Data.gov (United States)

    National Park Service, Department of the Interior — The accuracy assessment field work was performed in May, 1997 to verify the accuracy of the vegetation communities spatial data developed by the USGS-NPS Vegetation...

  9. Perceptual Load Affects Eyewitness Accuracy and Susceptibility to Leading Questions

    Science.gov (United States)

    Murphy, Gillian; Greene, Ciara M.

    2016-01-01

    Load Theory (Lavie, 1995, 2005) states that the level of perceptual load in a task (i.e., the amount of information involved in processing task-relevant stimuli) determines the efficiency of selective attention. There is evidence that perceptual load affects distractor processing, with increased inattentional blindness under high load. Given that high load can result in individuals failing to report seeing obvious objects, it is conceivable that load may also impair memory for the scene. The current study is the first to assess the effect of perceptual load on eyewitness memory. Across three experiments (two video-based and one in a driving simulator), the effect of perceptual load on eyewitness memory was assessed. The results showed that eyewitnesses were less accurate under high load, in particular for peripheral details. For example, memory for the central character in the video was not affected by load but memory for a witness who passed by the window at the edge of the scene was significantly worse under high load. High load memories were also more open to suggestion, showing increased susceptibility to leading questions. High visual perceptual load also affected recall for auditory information, illustrating a possible cross-modal perceptual load effect on memory accuracy. These results have implications for eyewitness memory researchers and forensic professionals. PMID:27625628

  10. Chemical accuracy from quantum Monte Carlo for the Benzene Dimer

    CERN Document Server

    Azadi, Sam

    2015-01-01

    We report an accurate study of interactions between Benzene molecules using variational quantum Monte Carlo (VMC) and diffusion quantum Monte Carlo (DMC) methods. We compare these results with density functional theory (DFT) using different van der Waals (vdW) functionals. In our QMC calculations, we use accurate correlated trial wave functions including three-body Jastrow factors, and backflow transformations. We consider two benzene molecules in the parallel displaced (PD) geometry, and find that by highly optimizing the wave function and introducing more dynamical correlation into the wave function, we compute the weak chemical binding energy between aromatic rings accurately. We find optimal VMC and DMC binding energies of -2.3(4) and -2.7(3) kcal/mol, respectively. The best estimate of the CCSD(T)/CBS limit is -2.65(2) kcal/mol [E. Miliordos et al, J. Phys. Chem. A 118, 7568 (2014)]. Our results indicate that QMC methods give chemical accuracy for weakly bound van der Waals molecular interactions, compar...

  11. Perceptual Load Affects Eyewitness Accuracy & Susceptibility to Leading Questions

    Directory of Open Access Journals (Sweden)

    Gillian Murphy

    2016-08-01

    Full Text Available Load Theory (Lavie, 1995; 2005 states that the level of perceptual load in a task (i.e. the amount of information involved in processing task-relevant stimuli determines the efficiency of selective attention. There is evidence that perceptual load affects distractor processing, with increased inattentional blindness under high load. Given that high load can result in individuals failing to report seeing obvious objects, it is conceivable that load may also impair memory for the scene. The current study is the first to assess the effect of perceptual load on eyewitness memory. Across three experiments (two video-based and one in a driving simulator, the effect of perceptual load on eyewitness memory was assessed. The results showed that eyewitnesses were less accurate under high load, in particular for peripheral details. For example, memory for the central character in the video was not affected by load but memory for a witness who passed by the window at the edge of the scene was significantly worse under high load. High load memories were also more open to suggestion, showing increased susceptibility to leading questions. High visual perceptual load also affected recall for auditory information, illustrating a possible cross-modal perceptual load effect on memory accuracy. These results have implications for eyewitness memory researchers and forensic professionals.

  12. Perceptual Load Affects Eyewitness Accuracy and Susceptibility to Leading Questions.

    Science.gov (United States)

    Murphy, Gillian; Greene, Ciara M

    2016-01-01

    Load Theory (Lavie, 1995, 2005) states that the level of perceptual load in a task (i.e., the amount of information involved in processing task-relevant stimuli) determines the efficiency of selective attention. There is evidence that perceptual load affects distractor processing, with increased inattentional blindness under high load. Given that high load can result in individuals failing to report seeing obvious objects, it is conceivable that load may also impair memory for the scene. The current study is the first to assess the effect of perceptual load on eyewitness memory. Across three experiments (two video-based and one in a driving simulator), the effect of perceptual load on eyewitness memory was assessed. The results showed that eyewitnesses were less accurate under high load, in particular for peripheral details. For example, memory for the central character in the video was not affected by load but memory for a witness who passed by the window at the edge of the scene was significantly worse under high load. High load memories were also more open to suggestion, showing increased susceptibility to leading questions. High visual perceptual load also affected recall for auditory information, illustrating a possible cross-modal perceptual load effect on memory accuracy. These results have implications for eyewitness memory researchers and forensic professionals.

  13. Accuracy of Binary Black Hole Waveform Models for Advanced LIGO

    Science.gov (United States)

    Kumar, Prayush; Fong, Heather; Barkett, Kevin; Bhagwat, Swetha; Afshari, Nousha; Chu, Tony; Brown, Duncan; Lovelace, Geoffrey; Pfeiffer, Harald; Scheel, Mark; Szilagyi, Bela; Simulating Extreme Spacetimes (SXS) Team

    2016-03-01

    Coalescing binaries of compact objects, such as black holes and neutron stars, are the primary targets for gravitational-wave (GW) detection with Advanced LIGO. Accurate modeling of the emitted GWs is required to extract information about the binary source. The most accurate solution to the general relativistic two-body problem is available in numerical relativity (NR), which is however limited in application due to computational cost. Current searches use semi-analytic models that are based in post-Newtonian (PN) theory and calibrated to NR. In this talk, I will present comparisons between contemporary models and high-accuracy numerical simulations performed using the Spectral Einstein Code (SpEC), focusing at the questions: (i) How well do models capture binary's late-inspiral where they lack a-priori accurate information from PN or NR, and (ii) How accurately do they model binaries with parameters outside their range of calibration. These results guide the choice of templates for future GW searches, and motivate future modeling efforts.

  14. Pion polarizabilities: Theory vs Experiment

    CERN Document Server

    Ivanov, Mikhail A

    2015-01-01

    The values of charged pion polarizabilities obtained in the framework of chiral perturbation theory at the level of two-loop accuracy are compared with the experimental result recently reported by COMPASS Collaboration. It is found that the calculated value for the dipole polarizabilities $(\\alpha-\\beta)_{\\pi^\\pm}= (5.7\\pm 1.0)\\times 10^{-4}\\,{\\rm fm}^3$ fits quite well the experimental result $(\\alpha-\\beta)_{\\pi^\\pm} = (4.0 \\pm 1.2_{\\rm stat} \\pm 1.4_{\\rm syst}) \\times 10^{-4}\\,{\\rm fm}^3$.

  15. Theoretical accuracy in cosmological growth estimation

    Science.gov (United States)

    Bose, Benjamin; Koyama, Kazuya; Hellwing, Wojciech A.; Zhao, Gong-Bo; Winther, Hans A.

    2017-07-01

    We elucidate the importance of the consistent treatment of gravity-model specific nonlinearities when estimating the growth of cosmological structures from redshift space distortions (RSD). Within the context of standard perturbation theory (SPT), we compare the predictions of two theoretical templates with redshift space data from COLA (comoving Lagrangian acceleration) simulations in the normal branch of DGP gravity (nDGP) and general relativity (GR). Using COLA for these comparisons is validated using a suite of full N-body simulations for the same theories. The two theoretical templates correspond to the standard general relativistic perturbation equations and those same equations modeled within nDGP. Gravitational clustering nonlinear effects are accounted for by modeling the power spectrum up to one-loop order and redshift space clustering anisotropy is modeled using the Taruya, Nishimichi and Saito (TNS) RSD model. Using this approach, we attempt to recover the simulation's fiducial logarithmic growth parameter f . By assigning the simulation data with errors representing an idealized survey with a volume of 10 Gpc3/h3 , we find the GR template is unable to recover fiducial f to within 1 σ at z =1 when we match the data up to kmax=0.195 h /Mpc . On the other hand, the DGP template recovers the fiducial value within 1 σ . Further, we conduct the same analysis for sets of mock data generated for generalized models of modified gravity using SPT, where again we analyze the GR template's ability to recover the fiducial value. We find that for models with enhanced gravitational nonlinearity, the theoretical bias of the GR template becomes significant for stage IV surveys. Thus, we show that for the future large data volume galaxy surveys, the self-consistent modeling of non-GR gravity scenarios will be crucial in constraining theory parameters.

  16. A blood pressure measurement method based on synergetics theory

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    <正>The principle for blood pressure measurement using pulse transit time is introduced in this paper.And the math model of synergetics theory is studied in detail.The synergetics theory is applied in the analysis of blood pressure measurement data.The simulation results show that the application of synergetics theory is helpful to judge the normal blood pressure,and the accuracy is up to 80%.

  17. Graph-based linear scaling electronic structure theory

    CERN Document Server

    Niklasson, Anders M N; Negre, Christian F A; Cawkwell, Marc J; Swart, Pieter J; Mohd-Yusof, Jamal; Germann, Timothy C; Wall, Michael E; Bock, Nicolas; Djidjev, Hristo

    2016-01-01

    We show how graph theory can be combined with quantum theory to calculate the electronic structure of large complex systems. The graph formalism is general and applicable to a broad range of electronic structure methods and materials, including challenging systems such as biomolecules. The methodology combines well-controlled accuracy, low computational cost, and natural low-communication parallelism. This combination addresses substantial shortcomings of linear scaling electronic structure theory, in particular with respect to quantum-based molecular dynamics simulations.

  18. Graph theory

    CERN Document Server

    Diestel, Reinhard

    2000-01-01

    This book is a concise, yet carefully written, introduction to modern graph theory, covering all its major recent developments. It can be used both as a reliable textbook for an introductory course and as a graduate text: on each topic it covers all the basic material in full detail, and adds one or two deeper results (again with detailed proofs) to illustrate the more advanced methods of that field. This second edition extends the first in two ways. It offers a thoroughly revised and updated chapter on graph minors, which now includes full new proofs of two of the central Robertson-Seymour theorems (as well as a detailed sketch of the entire proof of their celebrated Graph Minor Theorem). Second, there is now a section of hints for all the exercises, to enhance their value for both individual study and classroom use.

  19. Hyperspherical theory of anisotropic exciton

    CERN Document Server

    Muljarov, E A; Tikhodeev, S G; Bulatov, A E; Birman, Joseph L; 10.1063/1.1286772

    2012-01-01

    A new approach to the theory of anisotropic exciton based on Fock transformation, i.e., on a stereographic projection of the momentum to the unit 4-dimensional (4D) sphere, is developed. Hyperspherical functions are used as a basis of the perturbation theory. The binding energies, wave functions and oscillator strengths of elongated as well as flattened excitons are obtained numerically. It is shown that with an increase of the anisotropy degree the oscillator strengths are markedly redistributed between optically active and formerly inactive states, making the latter optically active. An approximate analytical solution of the anisotropic exciton problem taking into account the angular momentum conserving terms is obtained. This solution gives the binding energies of moderately anisotropic exciton with a good accuracy and provides a useful qualitative description of the energy level evolution.

  20. Pesquisa de marcadores para os genes da cadeia pesada da beta-miosina cardíaca e da proteína C de ligação à miosina em familiares de pacientes com cardiomiopatia hipertrófica Research of markers for the genes of the heavy chain of cardiac beta-myosin and myosin binding protein C in relatives of patients with hypertrophic cardiomyopathy

    OpenAIRE

    Adriana Paula Tirone; Edmundo Arteaga; Alexandre da Costa Pereira; José Eduardo Krieger; Paula de Cássia Buck; Barbara Maria Ianni; Charles Mady

    2005-01-01

    OBJETIVO: Estudar os marcadores moleculares para os genes da cadeia pesada da beta-miosina cardíaca e da proteína-C de ligação à miosina em familiares de portadores de cardiomiopatia hipertrófica. MÉTODOS: Foram estudadas 12 famílias que realizaram anamnese, exame físico, eletrocardiograma, ecocardiograma e coleta de sangue para o estudo genético através da reação em cadeia da polimerasse. RESULTADOS: Dos 227 familiares 25% eram acometidos, sendo 51% do sexo masculino com idade média de 35±19...