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Artykuły w czasopismach na temat "ARC LENGTH CORRECTION"
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Huang, Xue Wei, Sun Ing Bao i Jing Wang. "An Optimization Design for Coefficient of Weld Reinforcement in Rapid Prototyping Based on Robotic Pulse MAG Forming". Applied Mechanics and Materials 217-219 (listopad 2012): 2148–53. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.2148.
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During the process of rapid prototyping based on robotic pulse MAG forming, the coefficient of weld reinforcement is crucial to the geometric accuracy and mechanical property of metallic parts. The orthogonal design method, as well as the range analysis and variance analysis, were applied in this article to study the effects of wire feed rate, welding speed, pulse correction and arc length correction on coefficient of weld reinforcement, finding out the factors which were significant to the coefficient of weld reinforcement and optimizing the process parameters. The experimental results show that the order of the significance of parameters is as following: the welding speed, the arc length correction, the wire feed rate, and the pulse correction. Among them, the welding speed and arc length correction have the greatest influence on the coefficient of weld reinforcement, as is 0.025. The optimal process parameters are: arc length correction 8%, welding speed 14mm/s, wire feed rate 7.2m/min and pulse correction 0. At the same time, the coefficient of weld reinforcement is between 2.94 and 3.00, as the degree of confidence is 97.5%.
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Brown, R. James. "Elimination of near-source ellipticity corrections to body-wave travel times by use of equidistant latitudes". Bulletin of the Seismological Society of America 75, nr 6 (1.12.1985): 1713–18. http://dx.doi.org/10.1785/bssa0750061713.
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Abstract The use of equidistant latitudes has been proposed by the author to eliminate discrepancies between angular and kilometric epicentral distances. This is done in combination with a path-length correction which depends on the inclination of the great ellipse containing the epicenter-receiver path. If there were a one-to-one correspondence between source-receiver surface arc length (in kilometers) and, say, P-wave travel time (for constant focal depth) for a standard spheroidal Earth, the ellipticity (time) correction could then be replaced by the distance correction described. However, one would only expect this to be approximately valid for small epicentral distances Δ. In this paper, the travel-time corrections made by using equidistant latitudes (and the great-ellipse correction) are compared with the “true” ellipticity corrections due to Dziewonski and Gilbert. It is seen that the present equidistant-latitude method gives P-wave correction values that, for example, are always within 0.05 sec of the “true” values for Δ ≦ 14° and normal focal depth (h ≦ 40 km). For large Δ(⪞ 45°) and/or great focal depth (h⪞ 475 km), these values may differ by more than 0.2 sec. This equidistant-latitude method of correcting body-wave travel times is thus not recommended for routine use, but it could be used to advantage in special studies involving smaller Δ and h.
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Zhang, Rui Ying, Yun Yan Hu i Jun Wang. "Research on the Technology for DC CMT Welding of AZ31B Magnesium Alloy". Applied Mechanics and Materials 483 (grudzień 2013): 18–22. http://dx.doi.org/10.4028/www.scientific.net/amm.483.18.
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Orthogonal experiment method was used on DC CMT welding of AZ31B magnesium alloy sheet. The tensile test was carried out on the CMT5305 microcomputer control universal testing machine .The effect regular of welding current, arc length correction and welding speed on tensile strength and elongation was analyzed and acquired the optimal combination of process parameters. That is, welding current is 62A, arc length correction is +30% and welding speed is 50cm/min. The microhardness test on joints was carried out. Its found that the curve of microhardness is "W" shaped and the micro-hardness of HAZ is minimum and that of weld zone is maximum.
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Cai, Menglei, Chenhui Wu i Xin Gao. "The Influence of Arc Length Correction on Welding in CMT Welding". IOP Conference Series: Earth and Environmental Science 170 (lipiec 2018): 042106. http://dx.doi.org/10.1088/1755-1315/170/4/042106.
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Ruckhofer, Josef, Josef Stoiber, Michael D. Twa i G. ünther Grabner. "Correction of astigmatism with short arc- length intrastromal corneal ring segments". Ophthalmology 110, nr 3 (marzec 2003): 516–24. http://dx.doi.org/10.1016/s0161-6420(02)01773-6.
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He, Kuan Fang, Ji Gang Wu i Si Wen Xiao. "Synchronic Fuzzy Control of Master and Slave Arc in Twin-Wire Pulsed Metal Active Gas Welding". Advanced Engineering Forum 2-3 (grudzień 2011): 69–73. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.69.
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This research aims at the retention of the stability of arcs in twin-arc pulsed metal active gas welding process. That is, a correction-factor fuzzy logic controller (FLC) is designed to keep the stability of arcs of twin-arcs pulsed metal active gas welding (MAG) process. In the controller, the peak arc voltage of the master welding power is controlled by the pulse base time with means of feed back of arc voltage. The peak arc voltage of slave welding power is controlled by the wire feeding speed with means of feed back of peak arc voltage. The adjusting fuzzy control rule with correction factor is introduced to design for controlling rule and table, and the FLC is realized in a Look-Up-Table (LUT) method. With the controller, the arc length can be kept stable in welding process. Experimental results are provided to confirm the effectiveness of this approach.
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Dan, Li. "A Three-Dimensional Display Technology of Reflected Acoustic Logging and Its Application Example". Geofluids 2023 (15.04.2023): 1–12. http://dx.doi.org/10.1155/2023/7979348.
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Reflection acoustic logging is a new technology for identifying geological structures around the well. It can be used to describe the geological structure, such as formation interface, fracture, and limestone cave. Based on the acoustic logging tool composed of the source and array receiver, the method can be used to image the geological structure around the well. Through migration imaging, the section crossing the well can be obtained in any azimuth. In the current three-dimensional (3D) display technology of reflection acoustic logging, the reflection plane around the well is always displayed as a reflection arc. The arc surface correction method can correct the arc surface in 3D imaging into a plane. According to the similarity criterion in a physical experiment and the need for practical research, we designed a scale model well experiment of dipole reflection acoustic logging. We obtained the 3D display of the reflection structure around the well by the experiment and realized the arc surface correction of the 3D display in reflection acoustic logging. The application shows the method can qualitatively describe the lateral extension length of the geological structure around the well. After the arc surface correction, the geological structure can be more accurately described.
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Erkorkmaz, Kaan, i Yusuf Altintas. "Quintic Spline Interpolation With Minimal Feed Fluctuation". Journal of Manufacturing Science and Engineering 127, nr 2 (25.04.2005): 339–49. http://dx.doi.org/10.1115/1.1830493.
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This paper presents a parameterization and an interpolation method for quintic splines, which result in a smooth and consistent feed rate profile. The discrepancy between the spline parameter and the actual arc length leads to undesirable feed fluctuations and discontinuity, which elicit themselves as high frequency acceleration and jerk harmonics, causing unwanted structural vibrations and excessive tracking error. Two different approaches are presented that alleviate this problem. The first approach is based on modifying the spline tool path so that it is optimally parameterized with respect to its arc length, which allows it to be accurately interpolated in real-time with minimal complexity. The second approach is based on scheduling the spline parameter to accurately yield the desired arc displacement (hence feed rate), either by approximation of the relationship between the arc length and the spline parameter with a feed correction polynomial, or by solving the spline parameter iteratively in real-time at each interpolation step. This approach is particularly suited for predetermined spline tool paths, which are not arc-length parameterized and cannot be modified. The proposed methods have been compared to approximately arc-length C3 quintic spline parameterization (Wang, F.-C., Wright, P. K., Barsky, B. A., and Yang, D. C. H., 1999, “Approximately Arc-Length Parameterized C3 Quintic Interpolatory Splines,” ASME J. Mech. Des, 121, No. 3., pp. 430–439) and first- and second-order Taylor series interpolation techniques (Huang, J.-T., and Yang, D. C. H., 1992, “Precision Command Generation for Computer Controlled Machines,” Precision Machining: Technology and Machine Development and Improvement, ASME-PED 58, pp. 89–104; Lin, R.-S. 2000, “Real-Time Surface Interpolator for 3-D Parametric Surface Machining on 3-Axis Machine Tools,” Intl. J. Mach. Tools Manuf., 40, No.10, pp. 1513–1526) in terms of feed rate consistency, computational efficiency, and experimental contouring accuracy.
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Kruchinin, A. M., M. Ya Pogrebisskiy, E. S. Ryazanova i A. Y. Chursin. "The arc voltage gradient as a multifactorial basic electrical characteristic of an arc steelmaking furnace". Physics and Chemistry of Materials Treatment 4 (2022): 23–31. http://dx.doi.org/10.30791/0015-3214-2022-4-23-31.
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The structure of the complex process of heating with an electric arc in an arc steelmaking furnace (ASF) due to radiation and convection depends primarily on the length of the arc. Identification of arc length required in process of melting control in ASF is impossible without knowledge of arc voltage gradient values. The arc voltage gradient is highly dependent on the temperature of the furnace and thereby on the heat exchange conditions of the arc in the melting space of the furnace during melting. Using the example of ASF, an engineering technique for determining the arc voltage gradient as a multifactorial basic electrical characteristic is proposed. Using the methods of the electric arc heat exchange model allows performing a basic two-factor version of the analytical calculation of the average voltage gradient of the arc column as a function of two parameters - the reactance of the furnace and the secondary voltage of the furnace transformer. Correction of the basic function is shown taking into account the value of the resistance of the equivalent ASF circuit and the electrode thermal mode index. The proposed method allows, already at the stage of development of the detailed design specification, to calculate analytically the most important energy physical characteristics of the ASF and, as a result, to choose a rational electrical mode of the ASF in order to improve energy and dynamic smelting indicators.
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Short, Mark, James J. Quirk, Chad D. Meyer i Carlos Chiquete. "Steady detonation propagation in a circular arc: a Detonation Shock Dynamics model". Journal of Fluid Mechanics 807 (18.10.2016): 87–134. http://dx.doi.org/10.1017/jfm.2016.597.
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We study the physics of steady detonation wave propagation in a two-dimensional circular arc via a Detonation Shock Dynamics (DSD) surface evolution model. The dependence of the surface angular speed and surface spatial structure on the inner arc radius ($R_{i}$), the arc thickness ($R_{e}-R_{i}$, where $R_{e}$ is the outer arc radius) and the degree of confinement on the inner and outer arc is examined. We first analyse the results for a linear $D_{n}$–$\unicode[STIX]{x1D705}$ model, in which the normal surface velocity $D_{n}=D_{CJ}(1-B\unicode[STIX]{x1D705})$, where $D_{CJ}$ is the planar Chapman–Jouguet velocity, $\unicode[STIX]{x1D705}$ is the total surface curvature and $B$ is a length scale representative of a reaction zone thickness. An asymptotic analysis assuming the ratio $B/R_{i}\ll 1$ is conducted for this model and reveals a complex surface structure as a function of the radial variation from the inner to the outer arc. For sufficiently thin arcs, where $(R_{e}-R_{i})/R_{i}=O(B/R_{i})$, the angular speed of the surface depends on the inner arc radius, the arc thickness and the inner and outer arc confinement. For thicker arcs, where $(R_{e}-R_{i})/R_{i}=O(1)$, the angular speed does not depend on the outer arc radius or the outer arc confinement to the order calculated. It is found that the leading-order angular speed depends only on $D_{CJ}$ and $R_{i}$, and corresponds to a Huygens limit (zero curvature) propagation model where $D_{n}=D_{CJ}$, assuming a constant angular speed and perfect confinement on the inner arc surface. Having the normal surface speed depend on curvature requires the insertion of a boundary layer structure near the inner arc surface. This is driven by an increase in the magnitude of the surface wave curvature as the inner arc surface is approached that is needed to meet the confinement condition on the inner arc surface. For weak inner arc confinement, the surface wave spatial variation with the radial coordinate is described by a triple-deck structure. The first-order correction to the angular speed brings in a dependence on the surface curvature through the parameter $B$, while the influence of the inner arc confinement on the angular velocity only appears in the second-order correction. For stronger inner arc confinement, the surface wave structure is described by a two-layer solution, where the effect of the confinement on the angular speed is promoted to the first-order correction. We also compare the steady-state arc solution for a PBX 9502 DSD model to an experimental two-dimensional arc geometry validation test.
Rozprawy doktorskie na temat "ARC LENGTH CORRECTION"
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RAJ, DESH. "STUDY AND ANALYSES OF ARC LENGTH CORRECTION AND MECHANICAL PROPERTIES ON WELD BEAD GEOMETRY FOR AA6061T6 BY COLD METAL TRANSFORMATION PROCESS". Thesis, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18941.
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Welded aluminium AA6061T6 joints have a wide range of industrial
applications due to their low cost, lightweight, and excellent efficiency. In the
automation industry, thin aluminium AA6061T6 of various thicknesses is
widely utilized. Traditional welding procedures have always had issues with
burn-through and distortion when welding these light aluminium AA 6061T6
joints due to their high heat input and large spatters. Because of its low
distortion rate and low heat input, the CMT welding technique is an excellent
choice for attaching thin sheets. In this study, Aluminium AA 6061T6 joints of
grade 6000 series welded using the CMT welding process, and the mechanical
properties of the joints investigated. The Taguchi L9 optimization technique
was utilised to determine the best process factors for achieving the highest
tensile strength. The maximum tensile strength of Aluminium 6061T6 joints
welded at 100 A current, 6 mm/s welding speed, and a -10 percent Arc length
correction factor was determined to be 206 MPa. The weld zone obtained its
maximum micro-hardness value of 81.05 HB, but the heat-affected zone had a
lower value (HAZ). The residual stresses of the welded junction detected using
the X-ray diffraction (XRD) technique. In the weld zone and base plate,
residual stress was compressive, while in the heat-affected zone, it was tensile
(HAZ). The CMT welding procedure may use to create high-strength
aluminium 6061T6 joints of various thicknesses.
Książki na temat "ARC LENGTH CORRECTION"
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Lyon, J. Vanessa. Figuring Faith and Female Power in the Art of Rubens. NL Amsterdam: Amsterdam University Press, 2020. http://dx.doi.org/10.5117/9789462985513.
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Figuring Faith and Female Power in the Art of Rubens argues that the Baroque painter, propagandist, and diplomat, Peter Paul Rubens, was not only aware of rapidly shifting religious and cultural attitudes toward women, but actively engaged in shaping them. Today, Rubens’s paintings continue to be used -- and abused -- to prescribe and proscribe certain forms of femininity. Repositioning some of the artist’s best-known works within seventeenth-century Catholic theology and female court culture, this book provides a feminist corrective to a body of art historical scholarship in which studies of gender and religion are often mutually exclusive. Moving chronologically through Rubens’s lengthy career, the author shows that, in relation to the powerful women in his life, Rubens figured the female form as a transhistorical carrier of meaning whose devotional and rhetorical efficacy was heightened rather than diminished by notions of female difference and particularity.
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Webb, Andrew. Colloids in critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0056.
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Colloid solutions are homogenous mixtures of large molecules suspended in a crystalloid solution. The efficacy of colloids as volume substitutes or expanders, and length of effect are determined by their physicochemical properties. Smaller volumes of colloid than crystalloid are required for resuscitation. The primary use of colloids is in the correction of circulating volume. Rather than using fixed haemodynamic endpoints, fluid can be given in small aliquots with assessment of the dynamic haemodynamic response to each aliquot. The aim of a fluid challenge is to produce a small, but significant (200 mL) and rapid increase in plasma volume with changes in central venous pressure or stroke volume used to judge fluid responsiveness. Colloid fluids give a reliable increase in plasma volume to judge fluid responsiveness.
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Morawetz, Klaus. Deep Impurities with Collision Delay. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0017.
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The linearised nonlocal kinetic equation is solved analytically for impurity scattering. The resulting response function provides the conductivity, plasma oscillation and Fermi momentum. It is found that virial corrections nearly compensate the wave-function renormalizations rendering the conductivity and plasma mode unchanged. Due to the appearance of the correlated density, the Luttinger theorem does not hold and the screening length is influenced. Explicit results are given for a typical semiconductor. Elastic scattering of electrons by impurities is the simplest but still very interesting dissipative mechanism in semiconductors. Its simplicity follows from the absence of the impurity dynamics, so that individual collisions are described by the motion of an electron in a fixed potential.
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Cloyes, Kristin G., i Kathryn A. Burns. Aging prisoners and the provision of correctional mental health. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199360574.003.0057.
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The incarcerated population is aging. Newly arrested individuals and those aging in prison from mandatory lengthy sentences contribute to this dynamic. Screening for impairment and developing effective interventions and treatment for the incarcerated elderly has become a substantial challenge. The number of U.S. prisoners aged 65 or older grew at 94 times the rate of the overall prison population between 2007-2012. In 2011 7.9% of state and federal inmates were 55 or older; there were 26,700 over age 65. The number of inmates over 60 years of age in U.K. prisons increased by 120% between 2002 and 2013. Similar growth trends are reported in Sweden, Japan, Australia and Canada. This growth is complicated by the fact that chronological age does not necessarily match ‘health age’ or health status in prison. As a result, many prison systems have adjusted their definition of ‘elderly’ down to age 55 (and some as low as 40) to reflect the relatively poor health status of aging men and women in their institutions. Typical correctional health services in prisons across the U.S. are already hard-pressed to keep up with increasing demands for care of aging inmates. The responsibility to provide adequate health services for prisoners remains despite shrinking local, county, state and federal budgets. This chapter reviews the current status and prevalence of the incarcerated elderly, and presents best practice models for their care.
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Furst, Eric M., i Todd M. Squires. Light scattering microrheology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199655205.003.0005.
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The fundamentals and best practices of passive microrheology using dynamic light scattering and diffusing wave spectroscopy are discussed. The principles of light scattering are introduced and applied in both the single and multiple scattering regimes, including derivations of the light and field autocorrelation functions. Applications to high-frequency microrheology and polymer dynamics are presented, including inertial corrections. Methods to treat gels and other non-ergodic samples, including multi-speckle and optical mixing designs are discussed. Dynamic light scattering (DLS) is a well established method for measuring the motion of colloids, proteins and macromolecules. Light scattering has several advantages for microrheology, especially given the availability of commercial instruments, the relatively large sample volumes that average over many probes, and the sensitivity of the measurement to small particle displacements, which can extend the range of length and timescales probed beyond those typically accessed by the methods of multiple particle tracking and bulk rheology.
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Ullyot, Michael. The Rhetoric of Exemplarity in Early Modern England. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192849335.001.0001.
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This study makes two new arguments about the rhetoric of exemplarity in late Elizabethan and Jacobean culture: that exemplarity is a recursive cycle driven by rhetoricians’ words and readers’ actions; and that positive examples are never actionable. They serve, rather, as aspirational models of readers’ own posthumous biographies—like Alexander the Great envying Achilles for Homer’s writing of his life. This study defines the three types of decorum on which exemplary rhetoric and imitation depend. It charts their operations through Philip Sidney’s poetics, Edmund Spenser’s poetry, and the dedications, sermons, elegies, biographies, and other occasional texts on and for Robert Devereux, second Earl of Essex, and Henry, Prince of Wales. It expands the definition of occasional texts to include those that criticize their circumstances to demand better ones; and it historicizes moral exemplarity in the contexts of sixteenth-century Protestant memory and humanist pedagogy. The first full-length study in three decades of the rhetoric of moral exemplarity and of Prince Henry’s textual representations, The Rhetoric of Exemplarity in Early Modern England concludes that all exemplary subjects suffer from ‘the problem of metonymy’: the objection that their chosen excerpts misrepresent their missing parts. As this problem also besets historicist literary criticism, which is subject to corrections from the archive, this study recognizes that its argumentative rhetoric is itself exemplary.
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Zahedi, Sohrab. Diagnostic review and revision. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199360574.003.0020.
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The criminalization of people with mental illness is a sad commentary on the United States’ mental health system. Yet, the phenomenon presents the field of psychiatry with an opportunity that is now scarce in civil society: lengths of sentence in terms of weeks to years that allow for in-depth observation and treatment of the inmate with mental illness. A few days in a hospital fails to provide the needed opportunity for a detailed and accurate evaluation. Today, people with mental illness account for more than one million annual arrests and many among these individuals will spend weeks to months in jail before being either transferred to a prison for sentences beyond one year or released back into the community. At its core, psychiatric diagnosis relies on the subjective complaints of the patient and objective signs noted on examination. Considering the chronic and fluctuating course of most psychiatric diagnoses, a thorough assessment also requires a review of past documented behaviors. When someone is hospitalized for a psychiatric condition, the first goal is often observation, followed by diagnosis, and then treatment. Psychiatric hospitals are being greatly constrained in the amount of time available for observation and accurate diagnosis; the correctional setting, as an unintended consequence of mass incarceration, provides an extended opportunity to achieve improved diagnostic accuracy. This chapter reflects on the diagnostic opportunities that a jail or a prison setting affords.
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Ślusarski, Marek. Metody i modele oceny jakości danych przestrzennych. Publishing House of the University of Agriculture in Krakow, 2017. http://dx.doi.org/10.15576/978-83-66602-30-4.
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The quality of data collected in official spatial databases is crucial in making strategic decisions as well as in the implementation of planning and design works. Awareness of the level of the quality of these data is also important for individual users of official spatial data. The author presents methods and models of description and evaluation of the quality of spatial data collected in public registers. Data describing the space in the highest degree of detail, which are collected in three databases: land and buildings registry (EGiB), geodetic registry of the land infrastructure network (GESUT) and in database of topographic objects (BDOT500) were analyzed. The results of the research concerned selected aspects of activities in terms of the spatial data quality. These activities include: the assessment of the accuracy of data collected in official spatial databases; determination of the uncertainty of the area of registry parcels, analysis of the risk of damage to the underground infrastructure network due to the quality of spatial data, construction of the quality model of data collected in official databases and visualization of the phenomenon of uncertainty in spatial data. The evaluation of the accuracy of data collected in official, large-scale spatial databases was based on a representative sample of data. The test sample was a set of deviations of coordinates with three variables dX, dY and Dl – deviations from the X and Y coordinates and the length of the point offset vector of the test sample in relation to its position recognized as a faultless. The compatibility of empirical data accuracy distributions with models (theoretical distributions of random variables) was investigated and also the accuracy of the spatial data has been assessed by means of the methods resistant to the outliers. In the process of determination of the accuracy of spatial data collected in public registers, the author’s solution was used – resistant method of the relative frequency. Weight functions, which modify (to varying degree) the sizes of the vectors Dl – the lengths of the points offset vector of the test sample in relation to their position recognized as a faultless were proposed. From the scope of the uncertainty of estimation of the area of registry parcels the impact of the errors of the geodetic network points was determined (points of reference and of the higher class networks) and the effect of the correlation between the coordinates of the same point on the accuracy of the determined plot area. The scope of the correction was determined (in EGiB database) of the plots area, calculated on the basis of re-measurements, performed using equivalent techniques (in terms of accuracy). The analysis of the risk of damage to the underground infrastructure network due to the low quality of spatial data is another research topic presented in the paper. Three main factors have been identified that influence the value of this risk: incompleteness of spatial data sets and insufficient accuracy of determination of the horizontal and vertical position of underground infrastructure. A method for estimation of the project risk has been developed (quantitative and qualitative) and the author’s risk estimation technique, based on the idea of fuzzy logic was proposed. Maps (2D and 3D) of the risk of damage to the underground infrastructure network were developed in the form of large-scale thematic maps, presenting the design risk in qualitative and quantitative form. The data quality model is a set of rules used to describe the quality of these data sets. The model that has been proposed defines a standardized approach for assessing and reporting the quality of EGiB, GESUT and BDOT500 spatial data bases. Quantitative and qualitative rules (automatic, office and field) of data sets control were defined. The minimum sample size and the number of eligible nonconformities in random samples were determined. The data quality elements were described using the following descriptors: range, measure, result, and type and unit of value. Data quality studies were performed according to the users needs. The values of impact weights were determined by the hierarchical analytical process method (AHP). The harmonization of conceptual models of EGiB, GESUT and BDOT500 databases with BDOT10k database was analysed too. It was found that the downloading and supplying of the information in BDOT10k creation and update processes from the analyzed registers are limited. An effective approach to providing spatial data sets users with information concerning data uncertainty are cartographic visualization techniques. Based on the author’s own experience and research works on the quality of official spatial database data examination, the set of methods for visualization of the uncertainty of data bases EGiB, GESUT and BDOT500 was defined. This set includes visualization techniques designed to present three types of uncertainty: location, attribute values and time. Uncertainty of the position was defined (for surface, line, and point objects) using several (three to five) visual variables. Uncertainty of attribute values and time uncertainty, describing (for example) completeness or timeliness of sets, are presented by means of three graphical variables. The research problems presented in the paper are of cognitive and application importance. They indicate on the possibility of effective evaluation of the quality of spatial data collected in public registers and may be an important element of the expert system.
Części książek na temat "ARC LENGTH CORRECTION"
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"STEPPS in Correctional Settings". W Systems Training for Emotional Predictability and Problem Solving for Borderline Personality Disorder, redaktorzy Nancee S. Blum i Donald W. Black, 89–99. Oxford University Press, 2016. http://dx.doi.org/10.1093/med:psych/9780199384426.003.0005.
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This chapter describes STEPPS in Iowa correctional systems and elsewhere, as well as the US federal prison system. The program was introduced to the Iowa correctional system in 2005; data show that it is effective in reducing symptoms specific to borderline personality disorder. In addition, STEPPS has been shown to boost mood, reduce disciplinary infractions, and reduce self-harm behaviors. The advantages over other BPD treatment programs in prison settings include the relatively short 20-week length of STEPPS, which is very important because offenders have varying sentence lengths and are transferred or released (or receive parole/probation status) without notice. The program is easily learned by therapists strapped for time, since corrections-based therapists have little time for extensive additional training and budgets are tight. The STEPPS manual can be used “as-is” in prisons and community corrections without extensive modifications. Last, the authors describe potential problems of implementing the program in prisons.
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Zhu, Heliang, Xi Zhang i Patricia Ordenaz de Pablos. "The Role of Gold Market as Stabilizer of Service Industry". W Advances in Logistics, Operations, and Management Science, 267–82. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9758-4.ch014.
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China's gold futures market has been in market for more than four years, is the risk transfer function fully realized? How the performance of hedging? Based on the data of futures prices and spot prices from January 9th of 2008 to December 31st of 2010, we use the following four statistical models such as traditional regression model (OLS), two-variable vector auto regression model (B-VAR), error correction hedging model (ECM), and error correction GARCH model (EC-GARCH) to perform stationarity and cointegration test On the basis of minimum risk hedge ratio estimated, the following conclusions are made based on the study: (1) As China's gold futures market has run for more than three years, hedge is effective through the gold futures market, which can significantly reduce the participants ‘ risk of price fluctuation; (2)In practice, hedging ratio should be rationally determined by different models according to different hedging length and different expectations. Based on these conclusions, this paper also made corresponding policy recommendations.
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Nandi, Arnab, i Sumit Kundu. "Energy Efficient Packet Data Service in Wireless Sensor Network in Presence of Rayleigh Fading". W Applications and Developments in Grid, Cloud, and High Performance Computing, 232–45. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2065-0.ch015.
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Energy level performances of three packet delivery schemes in Wireless Sensor Networks (WSN) are evaluated in presence of Rayleigh fading. Three different information delivery mechanisms are investigated using regenerative relays with or without error correction capability. Energy consumption for successful delivery of a data packet for each mechanism is evaluated and compared under several conditions of node density, bit rate, transmit power, and channel fading. Energy efficiencies of different retransmission schemes are also evaluated. Further, an optimal packet length based on energy efficiency is derived. Impact of optimal packet size on average number of retransmission and total energy expenditure is analyzed for each delivery scheme.
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Eckle, Hans-Peter. "Mathematical Tools". W Models of Quantum Matter, 657–66. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199678839.003.0019.
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Chapter 19 introduces the mathematical techniques required to extract analytic infor- mation from the Bethe ansatz equations for a Heisenberg quantum spin chain of finite length. It discusses how the Bernoulli numbers are needed as a prerequisite for the Euler– Maclaurin summation formula, which allows to transform finite sums into integrals plus, in a systematic way, corrections taking into account the finite size of the system. Applying this mathematical technique to the Bethe ansatz equations results in linear integral equations of the Wiener–Hopf type for the solution of which an elaborate mathematical technique exists, the Wiener–Hopf technique.
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Woodruff, Todd E. "Optic Nerve Examination". W Glaucoma. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199757084.003.0009.
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•Small field of view but increased magnification •Significant degradation of the view from media opacities or small pupil •Lacks ability to perform stereoscopic examination •Useful when slit-lamp exam not possible •Most commonly used system •Variable magnification and field of view • Reasonable view through small pupil • Good stereoscopic view •Less degradation of view from media opacities than direct ophthalmoscope •The magnification and stereopsis obtained with a slit-lamp system is generally superior to that of a handheld or headlamp-based system. • Poor magnification, with wide field of view •Least degradation of view from media opacities •Value of stereopsis limited by poor magnification Fair to poor with small pupils •May be useful for bedside exam or in the operating room • The vertical diameter of the optic nerve can be easily estimated during a slit-lamp exam by the following method: 1. A thin slit beam is focused on the nerve through the lens of choice. 2. The vertical length of the beam is adjusted to match the height of the disc. 3. The length of the beam is read off the slit-lamp beam scale. 4. The scale reading is adjusted by the correction factor of the specific lens. •This estimation is reasonably accurate, but it tends to underestimate disc size in high levels of myopia, and overestimate in high hyperopia. • One can also use the scale projection of the direct ophthalmoscope to estimate nerve head size, with no correction factor needed. The small light cone of the direct ophthalmoscope subtends an angle of about 5 degrees, about the same size as an average optic disc, and can give a quick estimate of relative size. • Stereo-photographs are the most helpful but are more difficult to obtain in a reproducible manner. •Cameras with a prism-based fixed-angle method of taking simultaneous stereo-photos tend to produce more consistent results, but are more expensive. • While non-mydriatic cameras exist, images suffer when the pupil is smaller than 4 mm, and dilation is commonly employed to obtain the best images.
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Gheradini, Guilio, i Ronald P. Gruber. "Costal Cartilage Grafts". W Operative Plastic Surgery, redaktor Gregory R. D. Evans, 85–90. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780190499075.003.0010.
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Cartilage grafts are used for many purposes. In assessing the defect to be filled with costal cartilage, some factors must be taken into account. The length of the defect can extend up to 6–7 cm; a larger defect would require multiple grafts or bone grafts (usually vascularized). Large costal cartilage grafts are also difficult to harvest and have increased morbidity at the donor and recipient sites. The rigidity and firmness of costal cartilage can be used for structural augmentation (i.e., correction of saddle-nose deformities or to provide structural rigidity to the trachea and eyelid). However, costal cartilage cannot be considered a substitute for bone grafts when significant structural support is needed. Costal cartilage grafts can be used as onlay-type grafts to correct traumatic, congenital, or surgically induced facial deformities and as spacers to maintain mobility of the temporomandibular joint.
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Dyall, Kenneth G., i Knut Faegri. "Regular Approximations". W Introduction to Relativistic Quantum Chemistry. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195140866.003.0025.
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Perturbation theory is a useful tool for evaluating small corrections to a system, and as we noted in the preceding chapter, relativity is a small correction for much of the periodic table. If we can use perturbation theory based on an expansion in 1/c we assign much of the work associated with a more complete relativistic treatment to the end of an otherwise nonrelativistic calculation. The problems with the Pauli Hamiltonian—the singular operators and the questionable validity of an expansion in powers of p/mc—are essentially circumvented by the use of direct perturbation theory. For systems containing heavier atoms it is necessary to go to higher order in 1/c perturbation theory, and possibly even abandon perturbation theory altogether. If we could perform an expansion that yielded a zeroth-order Hamiltonian incorporating relativistic effects to some degree and that was manifestly convergent, it might be possible to use perturbation theory to low order for heavy elements. If we wish to incorporate some level of relativistic effects into the zeroth-order Hamiltonian, we cannot start from Pauli perturbation theory or direct perturbation theory. But can we find an alternative expansion that contains relativistic corrections and is valid for all r: that is, can we derive a regular expansion that is convergent for all reasonable values of the parameters? The expansion we consider in this chapter has roots in the work by Chang, Pélissier, and Durand (1986) and Heully et al. (1986), which was developed further by van Lenthe et al. (1993, 1994). These last authors coined the term “regular approximation” because of the properties of the expansion. The Pauli expansion results from taking 2mc2 out of the denominator of the equation for the elimination of the small component (ESC). The problem with this is that both E and V can potentially be larger in magnitude than 2mc2 and so the expansion is not valid in some region of space. In particular, there is always a region close to the nucleus where |V − E|/2mc2 > 1. An alternative operator to extract from the denominator is the operator 2mc2 − V , which is always positive definite for the nuclear potential and is always greater than 2mc2.
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Tully, Robert E. "Tractarian Dualism". W The Paideia Archive: Twentieth World Congress of Philosophy, 130–36. Philosophy Documentation Center, 1998. http://dx.doi.org/10.5840/wcp20-paideia199810230.
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While Wittgenstein’s Tractatus keeps issues of metaphysics and ontology at arm’s length, the world it presents seems altogether monistic in character. In Wittgenstein’s account, it is a world of objects and facts, a world which lacks selves, values, cognitive relations (such as belief), and God. I argue that the Tractarian world is nevertheless dualistic. I defend the view that the Tractatus points away from monism towards dualism and that Wittgenstein’s concepts of thought, sense, and understanding are an essential part of its structure. The language Wittgenstein uses was necessitated by his project of giving a sharp account of the nature of description. It is thus ironic that Wittgenstein defends dualism in the Tractatus and does so in the only form in which he thought it could be defended. Along the way, I try to show that his treatment of thought, sense, and understanding is both a continuation and correction of treatments which Frege and Russell had previously given to these concepts.
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"Conservation, Ecology, and Management of Catfish: The Second International Symposium". W Conservation, Ecology, and Management of Catfish: The Second International Symposium, redaktorzy Kevin P. Sullivan i Ivan W. Vining. American Fisheries Society, 2011. http://dx.doi.org/10.47886/9781934874257.ch17.
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<em>Abstract</em>.—The Missouri Department of Conservation suspected that blue catfish <em>Ictalurus furcatus </em>and flathead catfish <em>Pylodictis olivaris </em>were being heavily exploited by anglers in 22,539-ha Harry S. Truman Reservoir in west-central Missouri. A reward tag study was initiated in 2004 to determine angler exploitation rates for both species. Three hundred blue catfish ≥ 482 mm total length (TL) and 194 flathead catfish ≥ 508 mm TL were equipped with transbody Carlin dangler reward tags in 2004 and 2005, respectively. All reward tags displayed a reward value of US$50. A 5-year post-tagging estimate of annual exploitation (<em>u</em>) was calculated with a 25% annual correction for angler nonreporting and a one-time correction for tag loss. The estimated annual exploitation rates for blue catfish ranged from 25.5% to 33.4% with a mean of 28.8%. The estimated cumulative exploitation rate (<EM>U</EM>) at 5-years post-tagging was 81.7% for all sizes of tagged blue catfish and 92.4% for tagged blue catfish ≥ 610 mm TL. The estimated annual exploitation rates for flathead catfish ranged from 0% to 3.9% with a mean of 1.8%. The estimated cumulative exploitation rate at 5-years post-tagging for flathead catfish was 8.8%. These exploitation rates indicate that blue catfish are being heavily exploited while flathead catfish are not. Of all the reward tagged blue catfish that were reported by anglers, 7% were reported as released while 22% of the reported flathead catfish were released. These results are being used to examine possible regulation changes to protect the blue catfish fishery at Truman Reservoir.
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Strain, Virginia Lee. "‘Perpetuall Reformation’ in Book V of Spenser’s Faerie Queene". W Legal Reform in English Renaissance Literature, 32–62. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474416290.003.0002.
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This chapter offers a close reading of Book V of Spenser’s Faerie Queene, which represents the reformation of law in terms of both its equitable correction and its administration. The Knight of Justice, Artegall, corrects regional law and governance across a number of historical allegories that most frequently allude to the sixteenth-century English efforts to colonise Ireland. Yet his methods and success are called into question not only through his defeat in combat by Radigund, but also through his rescue that is accomplished by his fiancé. As Britomart travels back through Faerieland, retracing the knight’s steps in order to liberate him from thraldom to the Amazon, we discover that the countryside has not been subdued in the wake of his reformation of justice. Britomart’s re-enactments of the knight’s battles re-present the activities of legal reform and governance as ongoing tasks requiring consistent magisterial presence and attention. This chapter appears at the beginning of the book not only for chronological reasons, but because the matter introduces a number of topics and contexts that will be developed at greater length in the studies that follow, including legal and character education, Aristotelian legal equity, artificial reason, and itinerant justice.
Streszczenia konferencji na temat "ARC LENGTH CORRECTION"
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Nikolaev, A. A., M. V. Bulanov, P. G. Tulupov i I. A. Lozhkin. "An Improved Algorithm for Arc Furnace Mode Control with Dynamic Arc Length Correction at Metal Refining Period". W 2021 International Russian Automation Conference (RusAutoCon). IEEE, 2021. http://dx.doi.org/10.1109/rusautocon52004.2021.9537370.
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Erkorkmaz, Kaan, i Yusuf Altintas. "Quintic Spline Interpolation With Minimal Feed Fluctuation". W ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42428.
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This paper presents a parameterization and an interpolation method for quintic splines, which result in a smooth and consistent feedrate profile. The discrepancy between the spline parameter and the actual arc length leads to undesirable feed fluctuations and discontinuity, which elicit themselves as high frequency acceleration and jerk harmonics, causing unwanted structural vibrations and excessive tracking error. Two different approaches are presented that alleviate this problem: The first approach is based on modifying the spline toolpath so that it is optimally parameterized with respect to its arc length. The second approach is based on scheduling the spline parameter to accurately yield the desired arc displacement (i.e. feedrate), either by approximation of the relationship between the arc length and the spline parameter with a feed correction polynomial, or by solving the spline parameter iteratively in real-time at each interpolation step. The two approaches are compared to nearly arc length parameterized C3 quintic spline interpolation in terms of feedrate consistency and experimental tracking accuracy.
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Zhang, Peng, Jianmin Ma i Menglan Duan. "A New Higher-Order Euler-Bernoulli Beam Element of Absolute Nodal Coordinate Formulation". W ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19132.
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Abstract In this study, a new higher-order Euler-Bernoulli beam element of Absolute Nodal Coordinate Formulation (ANCF) is developed for geometrically nonlinear analysis of planar structures. The strain energy of the beam element is derived by applying the definition of the Green–Lagrange strain tensor in continuum mechanics. The first contribution of this research is to realize the accurate calculation of curvature on the beam element node by additionally considering the second derivative of the position vector obtained by quintic Hermite interpolation function. Furthermore, in traditional theory, the independent variable of finite formulation is arc-length coordinate s, while in this work, a correction is come up with and proven that it is actually an equivalent parameter. Some benchmark problems of straight beams are solved by the proposed element and accurate results are obtained by just fewer elements when compared with the other works including the traditional ANCF element and B23 element of ABAQUS. What leads to this accuracy result is that the precise calculation of nodal curvature is obtained from higher order interpolation scheme. The correctness and accuracy of the proposed element are validated in this work and it can be further developed for tackling large deformation and large rotation problems of spatial curved beams.
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GORBUNKOV, V. I., V. V. SHALAY i N. V. PUSTOVOI. "SUPERSONIC ARGON FLOW PARAMETERS IN AN ARCJET THRUSTER". W International Colloquia on Pulsed and Continuous Detonations. TORUS PRESS, 2021. http://dx.doi.org/10.30826/icpcd12b17.
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The small closed volume occupied by cold gas plasma is a feature of the orbit-correction propulsion systems of spacecraft (PSSC). When determining the kinetic parameters of the working fluid flow in the arcjet and argon is selected as the process gas, the most important characteristic is the gas temperature. The well-known statement about the adiabatic nature of the compression process due to an increase in temperature suggests that the compression process is a source of natural gas oscillations and is of paramount importance for establishing the Boltzmann distribution of excited atoms over energy levels. In the Boltzmann approximation, using the methods of emission spectroscopy, the temperature of the working gas in the PSSC was obtained which made it possible to determine the effective flow rate of argon and the corresponding speed of sound. The values of the kinetic parameters of the supersonic argon flow in the arcjet made it possible to substantiate the results of recording the frequency of oscillations of the arc voltage of the PSSC discharge chamber in the Helmholtz resonator mode near fH= 6.25 kHz. It is shown that the length of the discharge chamber in the approximation of a partially open resonator can be of decisive importance in finding the natural vibrations of the resonator. It is suggested that on the basis of the engine under consideration, it is possible to consider the initiation of detonation in a supersonic flow of a combustible mixture.
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Ying Kwan, Mei, Kit Lun Yick, Joanne Yip i Chi Yung Tse. "Intervention of arch support: A quantitative study". W 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002593.
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Hallux valgus is a common foot deformity characterized by hypermobility of the first metatarsal ray. The lower longitudinal arch is an intrinsic factor related to the lateral drift of the hallux. This paper conducted a quantitative study on the improvement of the first metatarsal and arch condition by arch support and used finite element analysis to simulate the bone displacement with the intervention of arch support. In this research, a foot arch support made of carbon fiber was developed and seventy-six female subjects were recruited for a two-month wear trial. Footprints of their dominant foot were measured to investigate the effect of the arch support on lifting the arch and correcting the hallux valgus pathology. Different foot parameters including foot length, foot breadth, heel breadth, arch angle, arch breadth, plantar arch index, foot type index, and hallux valgus angle were also compared. By using finite element analysis, the biomechanical effects of the arch support on the foot structure can be visualized. According to the results of the wear trial, the use of the arch support can significantly improve the arch curvature of the foot, while no significant correction of the hallux valgus angle was found. Among the arch parameters, the arch breadth and the foot type index are the key indicators to precisely characterize foot types and arch conditions. When a clear outline of the footprint is not available, arch breadth provides reliable association with the foot type index (R2 = 0.928). An arch breadth ≥ 4 cm is categorized as flatfoot. This article confirms the effectiveness of our arch support in lifting the arch over a two-month period and provides a scientific surrogate index to aid in diagnosis, which is important for therapeutic and diagnostic applications.
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Martino, P. Di, S. Colantuoni, L. Cirillo i G. Cinque. "CFD Modelling of an Advanced 1600 K Reverse-Flow Combustor". W ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-468.
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A fully-elliptic three dimensional computational fluid dynamic (CFD) code based on pressure-correction techniques has been used in the design of an advanced turbine single annular reverse-flow combustor (AR1600) under development at Alfa Romeo Avio (ARA). Fuel injection was handled using a Lagrangian liquid droplet spray model coupled to the gas phase equations, which are solved in an Eulerian frame of reference. Turbulent transport is described by the standard k-ε model. The combustion model utilizes a conserved scalar formulation and an assumed shape probability density function to account for chemistry-turbulence interaction. The numerical algorithm employs structured nonorthogonal curvilinear grids, node-centered variable arrangement and Cartesian velocity components. The code was validated on a similar combustor (AR318 turboprop engine of 600 SHP). The numerical results agree well with the test measurements available for this chamber. The aerothermal design of AR1600 (1600K exit temperature) has the same gemetrical constraints of AR318 (tip and root diameters for compressor outlet and turbine inlet), but the lenght is shorter to reduce surface area for less cooling and to utilize the excess air for more efficient mixing and combustion.
Raporty organizacyjne na temat "ARC LENGTH CORRECTION"
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Shen, Gianetto i Tyson. L52342 Development of Procedure for Low-Constraint Toughness Testing Using a Single-Specimen Technique. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), grudzień 2011. http://dx.doi.org/10.55274/r0010687.
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Pipelines from remote frontier regions are increasingly required to have adequate resistance to large deformations such as that caused by ground movement. In response to this, �strain-based design"� has been developed to enable assessment of imperfections at applied strains beyond yield. In addition, it is proposed to take advantage of the increased apparent toughness of pipe under low constraint, such as girth weld imperfections under axial tension, compared with the high-constraint toughness measured in conventional tests such as ASTM E1290 [1]. Application of low-constraint testing has been dvantageously applied in assessment of toughness for offshore pipeline projects. Also in the pipeline industry, demands on new pipeline projects include low design temperatures as well as high strain capacity. At the same time, increased strength is specified, which increases the level of required toughness. These factors make it increasingly important to assure weldment toughness, in particular to ensure that the failure mode remains ductile. It is well known that brittle cleavage is especially sensitive to constraint, and the availability of a toughness test that would reproduce field conditions would enable more rational development and acceptance of candidate welds and, in particular, enable more appropriate testing of weld heat-affected zones. This work was performed for specific application to surface circumferential cracks in pipe under strain-based design, for which the best constraint matching has been found to occur for clamped single-edge tension (SE(T)) specimens with H/W=10. For this geometry, a test procedure similar to that of ASTM E1820-06 for single-edge bend (SE(B)) and compact tension (C(T)) specimens was developed for J-resistance tests using a single-specimen technique. All the equations used in the procedure, including those for evaluation of J-integrals from the area under load/plastic crack mouth opening displacement (CMOD) curves, and evaluation of crack length from unloading compliance including rotation correction, were developed using finite element analysis (FEA) with a range of crack depths, focusing on a/W= 0.2 to 0.5 which is of most practical interest. The present procedure is compared with that of E1820 for SE(B) testing regarding evaluation of J-integral with crack growth correction, crack length evaluation, and correction of compliance for rotation.
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OKAY, ERHAN, KORHAN OZKAN, Keith Baldwin, Alexandre Arkader i Souroush Baghdadi. The clinical outcomes and current evidence in the surgical treatment of extremity-located fibrous dysplasia. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, maj 2023. http://dx.doi.org/10.37766/inplasy2023.5.0020.
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Review question / Objective: What are clinical outcomes and current evidence in the surgical treatment of extremity-located fibrous dysplasia? Condition being studied: Fibrous dysplasia is the fibro-osseous lesion of tissue where normal bone tissue is replaced by collagen fibroblast and varying amounts of osteoid cells which is caused by GNAS gene mutation. Surgery aims to correct deformities and avoid limb length discrepancies in symptomatic cases. Available options include curettage, grafting, corrective osteotomies, and using fixation materials. There is a need for an optimal surgical treatment.