Degree of Coverage of Radial Rule Bases
Coufal, David
Piscataway: IEEE, 2015, s. 1-6. ISBN 978-1-4673-7249-7. [NAFIPS 2015. Annual Meeting of the North American. Redmond (US), 17.08.2015-19.08.2015] R&D Projects: GA MŠk(CZ) LD13002 Institutional support: RVO:67985807 Keywords : radial fuzzy systems * convex optimization Subject RIV: IN - Informatics, Computer Science
Point Set Denoising Using Bootstrap-Based Radial Basis Function
Ramli, Ahmad; Abd. Majid, Ahmad
2016-01-01
This paper examines the application of a bootstrap test error estimation of radial basis functions, specifically thin-plate spline fitting, in surface smoothing. The presence of noisy data is a common issue of the point set model that is generated from 3D scanning devices, and hence, point set denoising is one of the main concerns in point set modelling. Bootstrap test error estimation, which is applied when searching for the smoothing parameters of radial basis functions, is revisited. The main contribution of this paper is a smoothing algorithm that relies on a bootstrap-based radial basis function. The proposed method incorporates a k-nearest neighbour search and then projects the point set to the approximated thin-plate spline surface. Therefore, the denoising process is achieved, and the features are well preserved. A comparison of the proposed method with other smoothing methods is also carried out in this study. PMID:27315105
Nádia Duarte
2011-06-01
Full Text Available Os aneurismas da artéria radial são raros e esporádicos, sendo que os pseudoaneurismas são mais frequentes do que os aneurismas verdadeiros e maioritariamente de configuração sacular. A etiologia é variada e diferenciam-se de outros diagnósticos pela pulsação e frémito. Raramente se complicam de ruptura, sendo a trombose e embolização as principais complicações. Dos casos publicados sobre aneurismas verdadeiros da artéria radial, apenas um está descrito como sendo secundário a lesão ocupacional repetitiva, sendo a maioria de causa idiopática. Os autores descrevem um caso de uma mulher de 63 anos, referenciada à consulta de Cirurgia Vascular por crescimento de massa pulsátil na tabaqueira anatómica da mão esquerda. O estudo por eco-doppler e angiografia, confirmaram o diagnóstico de aneurisma sacular da artéria radial, com 20 mm de maior eixo, arcada palmar permeável e sem sinais de embolização distal. Foi submetida a aneurismectomia parcial com laqueação dupla proximal e distal e endoaneurismorrafia. A cirurgia e pós-operatório decorreram sem complicações, nomeadamente complicações isquémicas. A propósito desde caso clínico, discute-se a abordagem diagnóstica e opções terapêuticas.Radial artery aneurysms are sporadic and rare, pseudoaneurysms are more common than true aneurysms, mainly in saccular configuration. The etiology is varied and difference from other diagnostics is done by the presence of pulse and thrill. Thrombosis and embolization are the main complications, while rupture is rare. From the reported cases of true aneurysms of the radial artery, only one is described as being secondary to repetitive occupational injury, the majority being idiopathic. The authors describe the case of a 63 year old woman, referred to a Vascular Surgery consultation because of a growing pulsatile mass in the anatomical snuffbox of the left hand. The Doppler and Angiography studies confirmed the diagnosis of
Radially Polarized Bessel-Gauss Beams in ABCD Optical Systems and Fiber-Based Generation
Schimpf, Damian; Putnam, William P.; Grogan, Michael D.; Ramachandran, Siddharth; Kaertner, Franz
2013-01-01
We derive solutions for radially polarized Bessel-Gauss beams in ABCD optical systems by superimposing decentered Gaussian beams with linear polarization states. We experimentally confirm the expression by employing a fiber-based mode-converter.
Neuronal spike sorting based on radial basis function neural networks
Taghavi Kani M
2011-02-01
Full Text Available "nBackground: Studying the behavior of a society of neurons, extracting the communication mechanisms of brain with other tissues, finding treatment for some nervous system diseases and designing neuroprosthetic devices, require an algorithm to sort neuralspikes automatically. However, sorting neural spikes is a challenging task because of the low signal to noise ratio (SNR of the spikes. The main purpose of this study was to design an automatic algorithm for classifying neuronal spikes that are emitted from a specific region of the nervous system."n "nMethods: The spike sorting process usually consists of three stages: detection, feature extraction and sorting. We initially used signal statistics to detect neural spikes. Then, we chose a limited number of typical spikes as features and finally used them to train a radial basis function (RBF neural network to sort the spikes. In most spike sorting devices, these signals are not linearly discriminative. In order to solve this problem, the aforesaid RBF neural network was used."n "nResults: After the learning process, our proposed algorithm classified any arbitrary spike. The obtained results showed that even though the proposed Radial Basis Spike Sorter (RBSS reached to the same error as the previous methods, however, the computational costs were much lower compared to other algorithms. Moreover, the competitive points of the proposed algorithm were its good speed and low computational complexity."n "nConclusion: Regarding the results of this study, the proposed algorithm seems to serve the purpose of procedures that require real-time processing and spike sorting.
Chemin, L.; Soubiran, C.; Crifo, F.; Jasniewicz, G.; Katz, D.; Hestroffer, D.; Udry, S.
2011-01-01
The Radial Velocity Spectrometer (RVS) on board of Gaia will perform a large spectroscopic survey to determine the radial velocities of some 1.5x10^8 stars. We present the status of ground-based observations of a sample of 1420 candidate standard stars designed to calibrate the RVS. Each candidate star has to be observed several times before Gaia launch (and at least once during the mission) to ensure that its radial velocity remains stable during the whole mission. Observations are performed...
MESHLESS METHOD BASED ON COLLOCATION WITH CONSISTENT COMPACTLY SUPPORTED RADIAL BASIS FUNCTIONS
SONG Kangzu; ZHANG Xiong; LU Mingwan
2004-01-01
Based on our previous study, the accuracy of derivatives of interpolating functions are usually very poor near the boundary of domain when Compactly Supported Radial Basis Functions (CSRBFs) are used, so that it could result in significant error in solving partial differential equations with Neumann boundary conditions. To overcome this drawback, the Consistent Compactly Supported Radial Basis Functions (CCSRBFs) are developed, which satisfy the predetermined consistency conditions. Meshless method based on point collocation with CCSRBFs is developed for solving partial differential equations. Numerical studies show that the proposed method improves the accuracy of approximation significantly.
A K Chattopadhyay; C V S Rao
2003-07-01
Here we describe the superiority of Bessel function as base function for radial expansion over Zernicke polynomial in the tomographic reconstruction technique. The causes for the superiority have been described in detail. The superiority has been shown both with simulated data for Kadomtsev’s model for saw-tooth oscillation and real experimental x-ray data from W7-AS Stellarator.
An AFM-based methodology for measuring axial and radial error motions of spindles
This paper presents a novel atomic force microscopy (AFM)-based methodology for measurement of axial and radial error motions of a high precision spindle. Based on a modified commercial AFM system, the AFM tip is employed as a cutting tool by which nano-grooves are scratched on a flat surface with the rotation of the spindle. By extracting the radial motion data of the spindle from the scratched nano-grooves, the radial error motion of the spindle can be calculated after subtracting the tilting errors from the original measurement data. Through recording the variation of the PZT displacement in the Z direction in AFM tapping mode during the spindle rotation, the axial error motion of the spindle can be obtained. Moreover the effects of the nano-scratching parameters on the scratched grooves, the tilting error removal method for both conditions and the method of data extraction from the scratched groove depth are studied in detail. The axial error motion of 124 nm and the radial error motion of 279 nm of a commercial high precision air bearing spindle are achieved by this novel method, which are comparable with the values provided by the manufacturer, verifying this method. This approach does not need an expensive standard part as in most conventional measurement approaches. Moreover, the axial and radial error motions of the spindle can both be obtained, indicating that this is a potential means of measuring the error motions of the high precision moving parts of ultra-precision machine tools in the future. (paper)
Lead-based Radial Reflectors for Sodium-cooled Fast Reactor
The PWR spent nuclear fuel (SNF) is used as the blanket fuel and the low-enriched uranium (LEU) is used in the initial core. In a B and BR, the neutron economy should be very good so that it can achieve an equilibrium breed-and-burn condition. One way to achieve the good neutron economy is by maximizing the fuel volume fraction in the core. At the same time, the neutron fraction should be improved. In particular, a good reflector is really important in a compact B and BR since the radial neutron leakage is relatively enhanced. In this study, several alternative radial reflector materials are introduced and investigated. Particularly, lead-based radial reflectors are evaluated in terms of the core lifetime and the coolant void reactivity (CVR). The neutronic analyses were all performed by the Monte Carlo code McCARD. Several lead-based reflector materials for a small B and BR reactor have been investigated in terms of the neutronic performances. It was found that a sufficient reflector thickness is important to achieve high performance B and BR by using a lead-based reflector. It is also shown that the radial reflector has a small impact on the CVR: it mainly affects the neutronic performance. It is concluded that pure lead, LME and LBE provide much better neutron economy than the conventional steel reflector. Among the lead-based reflectors, LME reflector is considered as a favorable reflector for the small B and BR because it has a relatively low melting temperature and also it provides a good neutron economy
Dorca, Daniel Azevedo; Camacho, Jose Roberto [Universidade Federal de Uberlandia (UFU), MG (Brazil). Curso de Mestrado em Engenharia Eletrica
2008-07-01
This work investigates the small-disturbance stability of a 30 bus radial distribution system with distributed generation units. This work is realized through the time domain simulations and through the eigenvalue analysis and participation factors. The eigenvalue analysis show that is possible to predict a possible system instability face to a disturbance. The development of this work was stimulated by the increasing of the distributed generation units in the distribution networks. (author)
Model-Based Iterative Reconstruction for Radial Fast Spin-Echo MRI
Block, Kai Tobias; Frahm, Jens
2016-01-01
In radial fast spin-echo MRI, a set of overlapping spokes with an inconsistent T2 weighting is acquired, which results in an averaged image contrast when employing conventional image reconstruction techniques. This work demonstrates that the problem may be overcome with the use of a dedicated reconstruction method that further allows for T2 quantification by extracting the embedded relaxation information. Thus, the proposed reconstruction method directly yields a spin-density and relaxivity map from only a single radial data set. The method is based on an inverse formulation of the problem and involves a modeling of the received MRI signal. Because the solution is found by numerical optimization, the approach exploits all data acquired. Further, it handles multi-coil data and optionally allows for the incorporation of additional prior knowledge. Simulations and experimental results for a phantom and human brain in vivo demonstrate that the method yields spin-density and relaxivity maps that are neither affect...
ZHENG Guangguo; ZHOU Dongsheng; WEI Xiaopeng; ZHANG Qiang
2012-01-01
Compactly supported radial basis function can enable the coefficient matrix of solving weigh linear system to have a sparse banded structure, thereby reducing the complexity of the algorithm. Firstly, based on the compactly supported radial basis function, the paper makes the complex quadratic function （Multiquadric, MQ for short） to be transformed and proposes a class of compactly supported MQ function. Secondly, the paper describes a method that interpolates discrete motion capture data to solve the motion vectors of the interpolation points and they are used in facial expression reconstruction. Finally, according to this characteris- tic of the uneven distribution of the face markers, the markers are numbered and grouped in accordance with the density level, and then be interpolated in line with each group. The approach not only ensures the accuracy of the deformation of face local area and smoothness, but also reduces the time complexity of computing.
Chemin, L; Crifo, F; Jasniewicz, G; Katz, D; Hestroffer, D; Udry, S
2011-01-01
The Radial Velocity Spectrometer (RVS) on board of Gaia will perform a large spectroscopic survey to determine the radial velocities of some 1.5x10^8 stars. We present the status of ground-based observations of a sample of 1420 candidate standard stars designed to calibrate the RVS. Each candidate star has to be observed several times before Gaia launch (and at least once during the mission) to ensure that its radial velocity remains stable during the whole mission. Observations are performed with the high-resolution spectrographs SOPHIE, NARVAL and CORALIE, completed with archival data of the ELODIE and HARPS instruments. The analysis shows that about 7% of the current catalogue exhibits variations larger than the adopted threshold of 300 m/s. Consequently, those stars should be rejected as reference targets, due to the expected accuracy of the Gaia RVS. Emphasis is also put here on our observations of bright asteroids to calibrate the ground-based velocities by a direct comparison with celestial mechanics. ...
Rolanas Dauksevicius
2013-04-01
Full Text Available Examination of wrist radial pulse is a noninvasive diagnostic method, which occupies a very important position in Traditional Chinese Medicine. It is based on manual palpation and therefore relies largely on the practitioner’s subjective technical skills and judgment. Consequently, it lacks reliability and consistency, which limits practical applications in clinical medicine. Thus, quantifiable characterization of the wrist pulse diagnosis method is a prerequisite for its further development and widespread use. This paper reports application of a noninvasive CCD sensor-based hybrid measurement system for radial pulse signal analysis. First, artery wall deformations caused by the blood flow are calibrated with a laser triangulation displacement sensor, following by the measurement of the deformations with projection moiré method. Different input pressures and fluids of various viscosities are used in the assembled artificial blood flow system in order to test the performance of laser triangulation technique with detection sensitivity enhancement through microfabricated retroreflective optical element placed on a synthetic vascular graft. Subsequently, the applicability of double-exposure whole-field projection moiré technique for registration of blood flow pulses is considered: a computational model and representative example are provided, followed by in vitro experiment performed on a vascular graft with artificial skin atop, which validates the suitability of the technique for characterization of skin surface deformations caused by the radial pulsation.
A radial distribution function-based open boundary force model for multi-centered molecules
Neumann, Philipp
2014-06-01
We derive an expression for radial distribution function (RDF)-based open boundary forcing for molecules with multiple interaction sites. Due to the high-dimensionality of the molecule configuration space and missing rotational invariance, a computationally cheap, 1D approximation of the arising integral expressions as in the single-centered case is not possible anymore. We propose a simple, yet accurate model invoking standard molecule- and site-based RDFs to approximate the respective integral equation. The new open boundary force model is validated for ethane in different scenarios and shows very good agreement with data from periodic simulations. © World Scientific Publishing Company.
Modelling and optimization of organic Rankine cycle based on a small-scale radial inflow turbine
Highlights: • Integrated modeling of the ORC based on radial inflow turbine is conducted. • Constant turbine efficiency is replaced by dynamic efficiency that obtained by losses. • Ratio of cycle net power output to turbine size is maximized using DIRECT method. • Dynamic turbine efficiency approach predicted maximum difference of 6.13% between R245fa and isobutane. • Maximum objective function of 0.5748 (kW/mm) was achieved by isobutane from optimization. - Abstract: In most of the organic Rankine cycle (ORC) studies, constant expander efficiency is considered for a wide range of cycle operating conditions and for various working fluids. This study presents an optimized modelling approach for the ORC based on radial inflow turbine, where the constant expander efficiency is replaced by dynamic efficiency that is unique for each set of cycle operating conditions and working fluid properties. Considering the size and performance of the ORC, the model was used to identify the key input variables that have significant effects on the turbine overall size and the cycle net electric power output. These parameters were then included in the optimization process using the DIRECT algorithm to maximize the ratio of cycle net electric power output to the turbine overall size (objective function) for six organic fluids. Results showed that, dynamic efficiency approach predicted considerable differences in the turbine efficiencies of various working fluids. The maximum difference of 6.13% between the turbine efficiencies of R245fa and isobutane was predicted. Also the optimization results showed that, the maximum objective function of 0.5748 kW/mm was achieved by isobutane with the cycle net electric power output and the turbine overall size of 90.3 kW and 157.2 mm respectively. Such results are better than the other studies and highlight the potential of the optimization technique to further improve the performance and reduce the size of the ORC based on small
Dou, Chun-Xia; Yue, Dong; Guerrero, Josep M.;
2016-01-01
This paper focuses on a multi-agent based distributed coordinated control for radial DC microgrid considering trans-mission time delays. Firstly, a two-level multi-agent system is constructed, where local control is formulated based on local states and executed by means of the first-level agent......, and dis-tributed coordinated control law is formulated based on wide-area information and executed by means of the secondary- level agent in order to improve the voltage control performances. Afterwards, the research mainly focuses on designing the local controller and the distributed coordinated...... controller. For pur-pose of robust stability, the local control is designed as local state-feedback based H∞ robust controller. It is worth mention-ing that the distributed coordinated control consists of local state feedback control and decoupling coordinated control law that only come from adjacent DER...
LPI radar signal detection based on radial integration of Choi-Williams time-frequency image
Yongjian Liu; Peng Xiao; Hongchao Wu; Weihua Xiao
2015-01-01
This paper mainly revolves the time-frequency image of low probability of intercept (LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Wil iams distribution (CWD) uses the ex-ponential kernel of bilinear generalized class of time-frequency distribution, it has an excel ent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio (SNR) condition. A radial integration method based on the in-tegral rotating factor is proposed to detect LPI radar signals when the signals’ time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar sig-nals’ time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additional y, the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.
Gradient distribution of radial structure of PAN-based carbon fiber treated by high temperature
Haitao Wang; Yu Wang; Ting Li; Shuai Wu; Lianghua Xu
2014-01-01
High-performance graphite fibers were prepared and analyzed. The gradient distribution of radial structure of PAN-based carbon fibers was characterized by two different Raman test methods (incident laser beam perpendicular to and parallel to the fiber axis) and studied by the distribution of graphitization degree. Meanwhile difference between the two Raman test methods was used to describe the orientation of the graphite crystallite along the fiber axis. The results showed that the radial structure of PAN-based carbon fiber presented different gradient distribution states at different heat treatment temperatures, and the graphitization degree in the skin region changed more rapidly compared with the core region since the skin region was more affected by temperature which resulted in the obvious difference between skin and core structures. The difference of graphitization degree (Δg) characterized by two different Raman test methods increased with heat treatment temperature, indicating that the high temperature treatment (HTT) promoted further stacking of graphite crystallite, and the orientation degree of the graphite crystallite along the fiber axis was continuously increased.
Baluev, Roman V.
2011-01-01
We use full available array of radial velocity data, including recently published HARPS and Keck observatory sets, to characterize the orbital configuration of the planetary system orbiting GJ876. First, we propose and describe in detail a fast method to fit perturbed orbital configuration, based on the integration of the sensitivity equations inferred by the equations of the original $N$-body problem. Further, we find that it is unsatisfactory to treat the available radial velocity data for ...
Wang, Bing; Meng, Yao-hua; Yu, Xiao-Hong
2014-01-01
For learning problem of Radial Basis Function Process Neural Network (RBF-PNN), an optimization training method based on GA combined with SA is proposed in this paper. Through building generalized Fr\\'echet distance to measure similarity between time-varying function samples, the learning problem of radial basis centre functions and connection weights is converted into the training on corresponding discrete sequence coefficients. Network training objective function is constructed according to...
Bajkova, A T; 10.1134/S1063773712080014
2012-01-01
To redetermine the Galactic spiral density wave parameters, we have performed a spectral (Fourier) analysis of the radial velocities for 44 masers with known trigonometric parallaxes, proper motions, and line-of-sight velocities. The masers are distributed in a wide range of Galactocentric distances $(3.5
Radial Basis Function Neural Network Based Super-Resolution Restoration for an Underspled Image
苏秉华; 金伟其; 牛丽红
2004-01-01
To achieve restoration of high frequency information for an underspled and degraded low-resolution image, a nonlinear and real-time processing method-the radial basis function (RBF) neural network based super-resolution method of restoration is proposed. The RBF network configuration and processing method is suitable for a high resolution restoration from an underspled low-resolution image. The soft-competition learning scheme based on the k-means algorithm is used, and can achieve higher mapping approximation accuracy without increase in the network size. Experiments showed that the proposed algorithm can achieve a super-resolution restored image from an underspled and degraded low-resolution image, and requires a shorter training time when compared with the multiplayer perception (MLP) network.
Thiele, Robert H; Colquhoun, Douglas A; Tucker-Schwartz, Jason M; Gillies, George T; Durieux, Marcel E
2012-10-01
Commonly used arterial respiratory variation metrics are based on mathematical analysis of arterial waveforms in the time domain. Because the shape of the arterial waveform is dependent on the site at which it is measured, we hypothesized that analysis of the arterial waveform in the frequency domain might provide a relatively site-independent means of measuring arterial respiratory variation. Radial and femoral arterial blood pressures were measured in nineteen patients undergoing liver transplantation. Systolic pressure variation (SPV), pulse pressure variation (PPV), area under the curve variation (AUCV), and mean arterial pressure variation (MAPV) at radial and femoral sites were calculated off-line. Two metrics, "Spectral Peak Ratio" (SPeR) and "Spectral Power Ratio" (SPoR) based on ratios of the spectral peak and spectral area (power) at the respiratory and cardiac frequencies, were calculated at both radial and femoral sites. Variance among radial-femoral differences was compared and correlation coefficients describing the relationship between respiratory variation at the radial and femoral sites were developed. The variance in radial-femoral differences were significantly different (p SPV, PPV, AUCV, MAPV, SPeR, and SPoR, respectively. Assuming a PPV treatment threshold of 12 % (or equivalent), differences in treatment decisions based on radial or femoral estimates would arise in 12, 14, 5.4, 5.7, 4.8, and 5.5 % of minutes for SPV, PPV, AUCV, MAPV, spectral peak ratio, and spectral power ratio, respectively. As compared to frequency domain-based estimates of respiratory variation, SPV and PPV are relatively dependent on the anatomic site at which they are measured. Spectral peak and power ratios are relatively site-independent means of measuring respiratory variation, and may offer a useful alternative to time domain-based techniques. PMID:22903732
Research on motion compensation method based on neural network of radial basis function
Zuo Yunbo
2014-01-01
The machining precision not only depends on accurate mechanical structure but also depends on motion compensation method. If manufacturing precision of mechanical structure cannot be improved, the motion compensation is a reasonable way to improve motion precision. A motion compensation method based on neural network of radial basis function (RBF) was presented in this paper. It utilized the infinite approximation advantage of RBF neural network to fit the motion error curve. The best hidden neural quantity was optimized by training the motion error data and calculating the total sum of squares. The best curve coefficient matrix was got and used to calculate motion compensation values. The experiments showed that the motion errors could be reduced obviously by utilizing the method in this paper.
Lihui LANG; Joachim DANCKERT; Karl Brian NIELSEN
2005-01-01
The hydrodynamic deep drawing process enables net shape or near net shape forming of complicated sheet metal parts made from difficultly forming materials, such as aluminium or high strength steels. Based on the conventional hydrodynamic deep drawing process, a new process, hydrodynamic deep drawing process, in which radial pressure is applied to the rim of the blank, is proposed. This new process has been analysed using FEM simulations and the obtained results have been compared with the experimental results. The material used in the experiments was Al-Mg-Si alloy, and in the FEM-simulations the elastic-plastic behaviour of Al-Mg-Si alloy was modelled using Barlat's 89 yield criteria.
Prediction Study on PCI Failure of Reactor Fuel Based on a Radial Basis Function Neural Network
Xinyu Wei
2016-01-01
Full Text Available Pellet-clad interaction (PCI is one of the major issues in fuel rod design and reactor core operation in water cooled reactors. The prediction of fuel rod failure by PCI is studied in this paper by the method of radial basis function neural network (RBFNN. The neural network is built through the analysis of the existing experimental data. It is concluded that it is a suitable way to reduce the calculation complexity. A self-organized RBFNN is used in our study, which can vary its structure dynamically in order to maintain the prediction accuracy. For the purpose of the appropriate network complexity and overall computational efficiency, the hidden neurons in the RBFNN can be changed online based on the neuron activity and mutual information. The presented method is tested by the experimental data from the reference, and the results demonstrate its effectiveness.
Radial Basis Function Neural Networks Based QSPR for the Prediction of log P
YAO,Xiao-Jun(姚小军); LIU,Man-Cang(刘满仓); ZHANG,Xiao-Yun(张晓昀); ZHANG,Rui-Sheng(张瑞生); HU,Zhi-De(胡之德); FAN,Bo-Tao(范波涛)
2002-01-01
Quantitative structure-property relatioonship (QSPR) method is used to study the correlation models between the structures of a set of diverse organic compounds and their log P. Molecular descriptors calculated from structure alone are used to describe the molecular structures. A subset of the calculated descriptors, selected using forward stepwise regression, is used in the QSPR models development. Multiple linear regression (MLR)and radial basis function neural networks (RBFNNs) are urilized to construct the linear and non-linear correlation model,respectively. The optimal QSPR model developedis based on a 7-17-1 RBFNNs architecture using seven calculated molecular descriptors. The root mean square errorsin predictions for the training, predicting and overall data sets are 0.284, 0.327 and 0.291 log P units, respectively.
Radial Basis Function Neural Networks Based QSPR for the Prediction of log P
姚小军; 范波涛; 等
2002-01-01
Quantitative structure-property relationship(QSPR) method is used to study the correlation models between the structures of a set of diverse organic compounds and their log P.Molecular descriptors calculated from strucure alone are used to describe the molecular structures.A subset of the calcualted descriptors,selected using forward stepwise regression,is used in the QSPR models development.Multiple linear regression (MLR) and radial basis function neural networks (RBFNNs) are utilied to construct the linear and non-linear correlation model,respectively,The optimal QSPR model developed is based on a 7-17-1 RBFNNs architecture using sever calculated molecular descriptors .The root mean square errors in predictions for the training,predicting and overall data sets are 0.284,0.327 and 0.291 log P units respectively.
A PC-based inverse design method for radial and mixed flow turbomachinery
Skoe, Ivar Helge
1991-01-01
An Inverse Design Method suitable for radial and mixed flow turbomachinery is presented. The codes are based on the streamline curvature concept; therefore, it is applicable for current personal computers from the 286/287 range. In addition to the imposed aerodynamic constraints, mechanical constraints are imposed during the design process to ensure that the resulting geometry satisfies production consideration and that structural considerations are taken into account. By the use of Bezier Curves in the geometric modeling, the same subroutine is used to prepare input for both aero and structural files since it is important to ensure that the geometric data is identical to both structural analysis and production. To illustrate the method, a mixed flow turbine design is shown.
Vibration measurement based on electronic speckle pattern interferometry and radial basis function
Dai, Xiangjun; Shao, Xinxing; Geng, Zhencen; Yang, Fujun; Jiang, Yijun; He, Xiaoyuan
2015-11-01
A method incorporating amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) with radial basis function (RBF) was proposed to investigate vibration characteristics of structures. The vibration patterns were obtained by AF-ESPI. A novel pre-filtering RBF method was presented to improve the quality of patterns. The out-of-plane vibration amplitude was rebuilt after fringe analysis. Ideal pre-filtering widow sizes for the presented RBF were given based on numerical experiments. For validation, an aluminum circular plate with fixed boundary was determined and compared with FEM, confirming the effectiveness of the proposed method. Finally, vibration characteristics of sandwich panels with honeycomb core were measured. The influence of presence of a pre-notch at different location was also investigated.
Xiaojing LIU; Yongchao XU; Shijian YUAN
2008-01-01
In order to meet the forming demands for low plasticity materials and large height-diameter ratio parts, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure is proposed. To investigate the effects of loading paths on the HDD with independent radial hydraulic pressure, the forming process of 5A06 aluminum alloy cylindrical cup with a hemispherical bottom was studied by numerical simula- tion. By employing the dynamic explicit analytical software ETA/Dynaform based on LS-DYNA3D, the effects of loading paths on the sheet-thickness distribution and surface quality were analyzed. The corresponding relations of the radial hydraulic pressure loading paths and the part's strain status on the forming limit diagram (FLD) were also discussed. The results indicated that a sound match between liquid chamber pressure and independent radial hydraulic pressure could restrain the serious thinning at the hemisphere bottom and that through adjusting radial hydraulic pressure could reduce the radial tensile strain and change the strain paths. Therefore, the drawing limit of the aluminum cylindrical cup with a hemispherical bottom could be increased significantly.
Design of Thermal Conductivity Apparatus Base on Transient-state Radial Cylinder Method
Bambang Dwi Argo
2013-01-01
Full Text Available Thermal properties i.e. thermal conductivity (k of agricultural products provide critical information and data for the design and manufacture of equipment and machines for their processing. Literature generally abounds in information on wide and common agricultural products but lack on some locally grown products. The aim of the present study was to design and construct the thermal conductivity apparatus embedded with controlled temperature system and equipped with record system supported with personal computer as data processor. The apparatus designed based on transient-state radial cylinder method, consist of three main parts i.e. measurement chamber, controls panel and data acquisition processor. Measurement chamber was cylinder equipped by radially sixteen node of thermocouple with controlled temperature heater on center cylinder axis. It was placed in temperature controlled box generated by air flow system to eliminate the effect of surrounding temperature outside chamber. Controls panel functioned as link bridge and control unit that connect the measurement chamber to data acquisition processor. It consists of some electronic circuit e.g. analog to digital converter (ADC to control and acquire data from some thermocouple and sensors. Personal computer as data acquisition processor embedded with software developed with Borland Delphi. Developed software featured with calibrating, recording, calculating mode and displaying all obtained data graphically. Testing procedure was conducted with empty and filled chamber condition to adjust and calibrate data captured by thermocouples and sensors and displayed on personal computer, compared with actual condition. After some adjustment and calibration, all system was well functioned. The outcomes were in good agreements with thermal conductivity (k of agricultural products reported in the literatures.Keywords—
Sistema Multiagente para el Diseño de Redes de Neuronas de Base Radial Óptimas
Valls, José M.; Molina, José M.; Inés M. Galván
2000-01-01
Las Redes de Neuronas de Base Radial (RNBR) se comportan muy bien en la aproximación de funciones, siendo su convergencia extremadamente rápida comparada con las redes de neuronas de tipo perceptrón multicapa. Sin embargo, el diseño de una RNBR para resolver un problema dado, no es sencillo ni inmediato, siendo el número de neuronas de la capa oculta de una Red de Base Radial (RBR) un factor crítico en el comportamiento de este tipo de redes. En este trabajo, el diseño de una RNBR está basado...
[Automated recognition of quasars based on adaptive radial basis function neural networks].
Zhao, Mei-Fang; Luo, A-Li; Wu, Fu-Chao; Hu, Zhan-Yi
2006-02-01
Recognizing and certifying quasars through the research on spectra is an important method in the field of astronomy. This paper presents a novel adaptive method for the automated recognition of quasars based on the radial basis function neural networks (RBFN). The proposed method is composed of the following three parts: (1) The feature space is reduced by the PCA (the principal component analysis) on the normalized input spectra; (2) An adaptive RBFN is constructed and trained in this reduced space. At first, the K-means clustering is used for the initialization, then based on the sum of squares errors and a gradient descent optimization technique, the number of neurons in the hidden layer is adaptively increased to improve the recognition performance; (3) The quasar spectra recognition is effectively carried out by the above trained RBFN. The author's proposed adaptive RBFN is shown to be able to not only overcome the difficulty of selecting the number of neurons in hidden layer of the traditional RBFN algorithm, but also increase the stability and accuracy of recognition of quasars. Besides, the proposed method is particularly useful for automatic voluminous spectra processing produced from a large-scale sky survey project, such as our LAMOST, due to its efficiency. PMID:16826929
Chen, Jiajia; Zhao, Pan; Liang, Huawei; Mei, Tao
2014-01-01
The autonomous vehicle is an automated system equipped with features like environment perception, decision-making, motion planning, and control and execution technology. Navigating in an unstructured and complex environment is a huge challenge for autonomous vehicles, due to the irregular shape of road, the requirement of real-time planning, and the nonholonomic constraints of vehicle. This paper presents a motion planning method, based on the Radial Basis Function (RBF) neural network, to guide the autonomous vehicle in unstructured environments. The proposed algorithm extracts the drivable region from the perception grid map based on the global path, which is available in the road network. The sample points are randomly selected in the drivable region, and a gradient descent method is used to train the RBF network. The parameters of the motion-planning algorithm are verified through the simulation and experiment. It is observed that the proposed approach produces a flexible, smooth, and safe path that can fit any road shape. The method is implemented on autonomous vehicle and verified against many outdoor scenes; furthermore, a comparison of proposed method with the existing well-known Rapidly-exploring Random Tree (RRT) method is presented. The experimental results show that the proposed method is highly effective in planning the vehicle path and offers better motion quality. PMID:25237902
A vision-based navigation approach with multiple radial shape marks for indoor aircraft locating
Zhou Haoyin
2014-02-01
Full Text Available Since GPS signals are unavailable for indoor navigation, current research mainly focuses on vision-based locating with a single mark. An obvious disadvantage with this approach is that locating will fail when the mark cannot be seen. The use of multiple marks can solve this problem. However, the extra process to design and identify different marks will significantly increase system complexity. In this paper, a novel vision-based locating method is proposed by using marks with feature points arranged in a radial shape. The feature points of the marks consist of inner points and outer points. The positions of the inner points are the same in all marks, while the positions of the outer points are different in different marks. Unlike traditional camera locating methods (the PnP methods, the proposed method can calculate the camera location and the positions of the outer points simultaneously. Then the calculation results of the positions of the outer points are used to identify the mark. This method can make navigation with multiple marks more efficient. Simulations and real world experiments are carried out, and their results show that the proposed method is fast, accurate and robust to noise.
Jiajia Chen
2014-09-01
Full Text Available The autonomous vehicle is an automated system equipped with features like environment perception, decision-making, motion planning, and control and execution technology. Navigating in an unstructured and complex environment is a huge challenge for autonomous vehicles, due to the irregular shape of road, the requirement of real-time planning, and the nonholonomic constraints of vehicle. This paper presents a motion planning method, based on the Radial Basis Function (RBF neural network, to guide the autonomous vehicle in unstructured environments. The proposed algorithm extracts the drivable region from the perception grid map based on the global path, which is available in the road network. The sample points are randomly selected in the drivable region, and a gradient descent method is used to train the RBF network. The parameters of the motion-planning algorithm are verified through the simulation and experiment. It is observed that the proposed approach produces a flexible, smooth, and safe path that can fit any road shape. The method is implemented on autonomous vehicle and verified against many outdoor scenes; furthermore, a comparison of proposed method with the existing well-known Rapidly-exploring Random Tree (RRT method is presented. The experimental results show that the proposed method is highly effective in planning the vehicle path and offers better motion quality.
Dimitroulis, Christos; Raptis, Theophanes; Raptis, Vasilios
2015-12-01
We present an application for the calculation of radial distribution functions for molecular centres of mass, based on trajectories generated by molecular simulation methods (Molecular Dynamics, Monte Carlo). When designing this application, the emphasis was placed on ease of use as well as ease of further development. In its current version, the program can read trajectories generated by the well-known DL_POLY package, but it can be easily extended to handle other formats. It is also very easy to 'hack' the program so it can compute intermolecular radial distribution functions for groups of interaction sites rather than whole molecules.
Prestack nonstationary deconvolution based on variable-step sampling in the radial trace domain
Li Fang; Wang Shou-Dong; Chen Xiao-Hong; Liu Guo-Chang; Zheng Qiang
2013-01-01
The conventional nonstationary convolutional model assumes that the seismic signal is recorded at normal incidence. Raw shot gathers are far from this assumption because of the effects of offsets. Because of such problems, we propose a novel prestack nonstationary deconvolution approach. We introduce the radial trace (RT) transform to the nonstationary deconvolution, we estimate the nonstationary deconvolution factor with hyperbolic smoothing based on variable-step sampling (VSS) in the RT domain, and we obtain the high-resolution prestack nonstationary deconvolution data. The RT transform maps the shot record from the offset and traveltime coordinates to those of apparent velocity and traveltime. The ray paths of the traces in the RT better satisfy the assumptions of the convolutional model. The proposed method combines the advantages of stationary deconvolution and inverse Q filtering, without prior information for Q. The nonstationary deconvolution in the RT domain is more suitable than that in the space-time (XT) domain for prestack data because it is the generalized extension of normal incidence. Tests with synthetic and real data demonstrate that the proposed method is more effective in compensating for large-offset and deep data.
Johnsson, Roger
2006-11-01
Methods to measure and monitor the cylinder pressure in internal combustion engines can contribute to reduced fuel consumption, noise and exhaust emissions. As direct measurements of the cylinder pressure are expensive and not suitable for measurements in vehicles on the road indirect methods which measure cylinder pressure have great potential value. In this paper, a non-linear model based on complex radial basis function (RBF) networks is proposed for the reconstruction of in-cylinder pressure pulse waveforms. Input to the network is the Fourier transforms of both engine structure vibration and crankshaft speed fluctuation. The primary reason for the use of Fourier transforms is that different frequency regions of the signals are used for the reconstruction process. This approach also makes it easier to reduce the amount of information that is used as input to the RBF network. The complex RBF network was applied to measurements from a 6-cylinder ethanol powered diesel engine over a wide range of running conditions. Prediction accuracy was validated by comparing a number of parameters between the measured and predicted cylinder pressure waveform such as maximum pressure, maximum rate of pressure rise and indicated mean effective pressure. The performance of the network was also evaluated for a number of untrained running conditions that differ both in speed and load from the trained ones. The results for the validation set were comparable to the trained conditions.
An, Yu; Liu, Jie; Zhang, Guanglei; Ye, Jinzuo; Mao, Yamin; Jiang, Shixin; Shang, Wenting; Du, Yang; Chi, Chongwei; Tian, Jie
2015-10-01
Fluorescence molecular tomography (FMT) is a promising tool in the study of cancer, drug discovery, and disease diagnosis, enabling noninvasive and quantitative imaging of the biodistribution of fluorophores in deep tissues via image reconstruction techniques. Conventional reconstruction methods based on the finite-element method (FEM) have achieved acceptable stability and efficiency. However, some inherent shortcomings in FEM meshes, such as time consumption in mesh generation and a large discretization error, limit further biomedical application. In this paper, we propose a meshless method for reconstruction of FMT (MM-FMT) using compactly supported radial basis functions (CSRBFs). With CSRBFs, the image domain can be accurately expressed by continuous CSRBFs, avoiding the discretization error to a certain degree. After direct collocation with CSRBFs, the conventional optimization techniques, including Tikhonov, L1-norm iteration shrinkage (L1-IS), and sparsity adaptive matching pursuit, were adopted to solve the meshless reconstruction. To evaluate the performance of the proposed MM-FMT, we performed numerical heterogeneous mouse experiments and in vivo bead-implanted mouse experiments. The results suggest that the proposed MM-FMT method can reduce the position error of the reconstruction result to smaller than 0.4 mm for the double-source case, which is a significant improvement for FMT.
Um sistema de pergunta-resposta para uma base de documentos
Quaresma, Paulo et al.
2006-01-01
Neste artigo apresentamos a metodologia seguida para a construção de um sistema de pergunta-resposta sobre uma base de documentos em português. Descrevemos o sistema que tem dois módulos distintos: análise prévia dos documentos (extracção de informação) e processamento das perguntas (recuperação de informação). O nosso sistema procura fazer um processamento, de corpos e da perguntas, suportado em teorias da linguística computacional:análise sintáctica (gramática de restrições), seguida da aná...
On the regularization of regional gravity field solutions in spherical radial base functions
Naeimi, Majid; Flury, Jakob; Brieden, Phillip
2015-08-01
Regional refinement of the gravity field models from satellite data using spherical radial base functions (SRBF) is an ill-posed problem. This is mainly due to the regional confinement of the data and the base functions, which leads to severe instabilities in the solutions. Here, this ill-posedness as well as the related regularization process are investigated. We compare three methods for the choice of the regularization parameter, which have been frequently used in gravity modelling. These methods are (1) the variance component estimation (VCE), (2) the generalized cross validation (GCV) and (3) the L-curve criterion. A particular emphasis is put on the impact of the SRBF type on the regularization parameter. To do this, we include two types of SRBF which are often used for regional gravity field modelling. These are the Shannon SRBF or the reproducing kernel and the Spline SRBF. The investigations are performed on two months of the real GOCE ultrasensitive gravity gradients over Central Africa and Amazon. The solutions are validated against a state-of-the-art global gravity solution. We conclude that if a proper regularization method is applied, both SRBF deliver more or less the same accuracy. We show that when the Shannon wavelet is used, the L-curve method gives the best results, while with the Spline kernel, the GCV outperforms the other two methods. Moreover, we observe that the estimated coefficients for the Spline kernel cannot be spatially interpreted. In contrast, the coefficients obtained for the Shannon wavelet reflect the energy of the recovered gravity field with a correlation factor of above 95 per cent. Therefore, when combined with the L-curve method, the Shannon SRBF is advantageous for regional gravity field estimation, since it is one of the simplest band-limited SRBF. In addition, it delivers promising solutions and the estimated coefficients represent the characteristics of the gravity field within the target region.
Gait analysis of a radial symmetrical hexapod robot based on parallel mechanisms
Xu, Kun; Ding, Xilun
2014-09-01
Most gait studies of multi-legged robots in past neglected the dexterity of robot body and the relationship between stride length and body height. This paper investigates the performance of a radial symmetrical hexapod robot based on the dexterity of parallel mechanism. Assuming the constraints between the supporting feet and the ground with hinges, the supporting legs and the hexapod body are taken as a parallel mechanism, and each swing leg is regarded as a serial manipulator. The hexapod robot can be considered as a series of hybrid serial-parallel mechanisms while walking on the ground. Locomotion performance can be got by analyzing these equivalent mechanisms. The kinematics of the whole robotic system is established, and the influence of foothold position on the workspace of robot body is analyzed. A new method to calculate the stride length of multi-legged robots is proposed by analyzing the relationship between the workspaces of two adjacent equivalent parallel mechanisms in one gait cycle. Referring to service region and service sphere, weight service sphere and weight service region are put forward to evaluate the dexterity of robot body. The dexterity of single point in workspace and the dexterity distribution in vertical and horizontal projection plane are demonstrated. Simulation shows when the foothold offset goes up to 174 mm, the dexterity of robot body achieves its maximum value 0.1644 in mixed gait. The proposed methods based on parallel mechanisms can be used to calculate the stride length and the dexterity of multi-legged robot, and provide new approach to determine the stride length, body height, footholds in gait planning of multi-legged robot.
Gait Analysis of a Radial Symmetrical Hexapod Robot Based on Parallel Mechanisms
XU Kun; DING Xilun
2014-01-01
Most gait studies of multi-legged robots in past neglected the dexterity of robot body and the relationship between stride length and body height. This paper investigates the performance of a radial symmetrical hexapod robot based on the dexterity of parallel mechanism. Assuming the constraints between the supporting feet and the ground with hinges, the supporting legs and the hexapod body are taken as a parallel mechanism, and each swing leg is regarded as a serial manipulator. The hexapod robot can be considered as a series of hybrid serial-parallel mechanisms while walking on the ground. Locomotion performance can be got by analyzing these equivalent mechanisms. The kinematics of the whole robotic system is established, and the influence of foothold position on the workspace of robot body is analyzed. A new method to calculate the stride length of multi-legged robots is proposed by analyzing the relationship between the workspaces of two adjacent equivalent parallel mechanisms in one gait cycle. Referring to service region and service sphere, weight service sphere and weight service region are put forward to evaluate the dexterity of robot body. The dexterity of single point in workspace and the dexterity distribution in vertical and horizontal projection plane are demonstrated. Simulation shows when the foothold offset goes up to 174 mm, the dexterity of robot body achieves its maximum value 0.164 4 in mixed gait. The proposed methods based on parallel mechanisms can be used to calculate the stride length and the dexterity of multi-legged robot, and provide new approach to determine the stride length, body height, footholds in gait planning of multi-legged robot.
Some recent results for a three-dimensional, semi-classical, tight-binding model for DNA show that there are two types of polarons, namely radial and twist polarons, which can transport charge along the DNA molecule. However, the existence of two types of base pairs in real DNA makes it crucial to find out if charge transport also exists in DNA chains with different base pairs. In this paper, we address this problem in its simple case, a homogeneous chain except for a single different base pair, which we call a base-pair inhomogeneity, and its effect on charge transport. Radial polarons experience either reflection or trapping. However, twist polarons are good candidates for charge transport along real DNA. This transport is also very robust with respect to weak parametric and diagonal disorder
Satisfiability of logic programming based on radial basis function neural networks
Hamadneh, Nawaf; Sathasivam, Saratha; Tilahun, Surafel Luleseged; Choon, Ong Hong [School of Mathematical Sciences, Universiti Sains Malaysia, 11800 USM, Penang (Malaysia)
2014-07-10
In this paper, we propose a new technique to test the Satisfiability of propositional logic programming and quantified Boolean formula problem in radial basis function neural networks. For this purpose, we built radial basis function neural networks to represent the proportional logic which has exactly three variables in each clause. We used the Prey-predator algorithm to calculate the output weights of the neural networks, while the K-means clustering algorithm is used to determine the hidden parameters (the centers and the widths). Mean of the sum squared error function is used to measure the activity of the two algorithms. We applied the developed technique with the recurrent radial basis function neural networks to represent the quantified Boolean formulas. The new technique can be applied to solve many applications such as electronic circuits and NP-complete problems.
Radial differential rotation vs surface differential rotation: investigation based on dynamo models
Korhonen, H
2008-01-01
Differential rotation plays a crucial role in the alpha-omega dynamo, and thus also in creation of magnetic fields in stars with convective outer envelopes. Still, measuring the radial differential rotation on stars is impossible with the current techniques, and even the measurement of surface differential rotation is difficult. In this work we investigate the surface differential rotation obtained from dynamo models using similar techniques as are used on observations, and compare the results with the known radial differential rotation used when creating the Dynamo model.
Um sistema de pergunta-resposta para uma base de documentos
Quaresma, Paulo et al.
2006-01-01
Full Text Available Neste artigo apresentamos a metodologia seguida para a construção de um sistema de pergunta-resposta sobre uma base de documentos em português. Descrevemos o sistema que tem dois módulos distintos: análise prévia dos documentos (extracção de informação e processamento das perguntas (recuperação de informação. O nosso sistema procura fazer um processamento, de corpos e da perguntas, suportado em teorias da linguística computacional:análise sintáctica (gramática de restrições, seguida da análise semântica usando a teoria da representação do discurso e finalmente a interpretação semântica/pragmática usando ontologia e inferência lógica. Apresentamos resultados da avaliação do seu desempenho que foi feita sobre dois conjuntos de documentos: textos de dois anos de jornais diários, o público e a folha de São Paulo (1994-1995; e um conjunto de documentos jurídicos: decisões do supremo tribunal, tribunal da relação e pareceres da procuradoria geral da república 9cerca de 10. 000 documentos.
Wundrak, Stefan; Paul, Jan; Ulrici, Johannes; Hell, Erich; Rasche, Volker
2015-06-01
In golden angle radial magnetic resonance imaging a constant azimuthal radial profile spacing of 111.246...(°) guarantees a nearly uniform azimuthal profile distribution in k-space for an arbitrary number of radial profiles. Even though this profile order is advantageous for various real-time imaging methods, in combination with balanced steady-state free precession (SSFP) sequences the large azimuthal angle increment may lead to strong image artifacts, due to the varying eddy currents introduced by the rapidly switching gradient scheme. Based on a generalized Fibonacci sequence, a new sequence of smaller irrational angles is introduced ( 49.750...(°), 32.039...(°), 27.198...(°), 23.628...(°), ... ). The subsequent profile orders guarantee the same sampling efficiency as the golden angle if at least a minimum number of radial profiles is used for reconstruction. The suggested angular increments are applied for dynamic imaging of the heart and the temporomandibular joint. It is shown that for balanced SSFP sequences, trajectories using the smaller golden angle surrogates strongly reduce the image artifacts, while the free retrospective choice of the reconstruction window width is maintained. PMID:25532172
Fusion prediction based on the attribute clustering net-work and the radial basis function
无
2001-01-01
A fusion prediction method is introduced on the basis of attribute clustering network and radial basis functions. An algorithm of quasi-self organization for developing the model for the fusion prediction is introduced. Some simulation results for chaotic time series are presented to show the performance of the method.
[Zaidemberg's vascularized radial graft].
Saint-Cast, Y
2010-12-01
In 1991, Carlos Zaidemberg described a new technique to repair scaphoid non-unions with a vascularized bone graft harvested from the radial styloid process. An anatomic study based on 30 dissections after colorized latex injection established the constancy of the radial styloid process's artery, while showing that its origin, course and length were subject to variations. In a retrospective series of 38 cases over a period of 10 years, the vascularized bone graft was indicated for: (1) scaphoid non-union with the presence of avascular changes of the proximal fragment (23 cases); (2) failed prior reconstruction with bone graft and internal fixation (nine cases); (3) degenerative styloid-scaphoid arthritis (three cases); (4) fracture on Preiser dystrophy (three cases). The five steps of the simplified operative technique without dissection of the vascular pedicle include: (1) longitudinal dorso-radial approach, identification of the periosteal portion of the radial styloid process artery; (2) incision of the first and second compartments, longitudinal arthrotomy under the second compartment; (3) styloidectomy and transversal resection of the scaphoid non-union and sclerotic bone; (4) elevation of the vascularized bone graft; (5) transversal and radial insertion of the vascularized bone graft, osteosynthesis by two or three K-wire touching the scaphoid's radial edge. Scaphoid union was obtained in 33 cases out of 38. The only postoperative complications were two transient radial paresthesia. The standardized surgical procedure using vascularized bone graft harvested from the radial styloid process provides an efficient scaphoid reconstruction. PMID:21087882
Poland, Michael P.; Moats, W.P.; Fink, J.H.
2008-01-01
We mapped the geometry of 13 silicic dikes at Summer Coon, an eroded Oligocene stratovolcano in southern Colorado, to investigate various characteristics of radial dike emplacement in composite volcanoes. Exposed dikes are up to about 7 km in length and have numerous offset segments along their upper peripheries. Surprisingly, most dikes at Summer Coon increase in thickness with distance from the center of the volcano. Magma pressure in a dike is expected to lessen away from the pressurized source region, which would encourage a blade-like dike to decrease in thickness with distance from the center of the volcano. We attribute the observed thickness pattern as evidence of a driving pressure gradient, which is caused by decreasing host rock shear modulus and horizontal stress, both due to decreasing emplacement depths beneath the sloping flanks of the volcano. Based on data from Summer Coon, we propose that radial dikes originate at depth below the summit of a host volcano and follow steeply inclined paths towards the surface. Near the interface between volcanic cone and basement, which may represent a neutral buoyancy surface or stress barrier, magma is transported subhorizontally and radially away from the center of the volcano in blade-like dikes. The dikes thicken with increasing radial distance, and offset segments and fingers form along the upper peripheries of the intrusions. Eruptions may occur anywhere along the length of the dikes, but the erupted volume will generally be greater for dike-fed eruptions far from the center of the host volcano owing to the increase in driving pressure with distance from the source. Observed eruptive volumes, vent locations, and vent-area intrusions from inferred post-glacial dike-fed eruptions at Mount Adams, Washington, USA, support the proposed model. Hazards associated with radial dike emplacement are therefore greater for longer dikes that propagate to the outer flanks of a volcano. ?? Springer-Verlag 2007.
Jingwen Tian; Meijuan Gao; Yonggang He
2013-01-01
Since the control system of the welding gun pose in whole‐position welding is complicated and nonlinear, an intelligent control system of welding gun pose for a pipeline welding robot based on an improved radial basis function neural network (IRBFNN) and expert system (ES) is presented in this paper. The structure of the IRBFNN is constructed and the improved genetic algorithm is adopted to optimize the network structure. This control system makes full use of the characteristics of the IRBFNN...
Yan, Qin; Zhong, Yanfei
2008-12-01
The radial basis function (RBF) neural network is a powerful method for remote sensing image classification. It has a simple architecture and the learning algorithm corresponds to the solution of a linear regression problem, resulting in a fast training process. The main drawback of this strategy is the requirement of an efficient algorithm to determine the number, position, and dispersion of the RBF. Traditional methods to determine the centers are: randomly choose input vectors from the training data set; vectors obtained from unsupervised clustering algorithms, such as k-means, applied to the input data. These conduce that traditional RBF neural network is sensitive to the center initialization. In this paper, the artificial immune network (aiNet) model, a new computational intelligence based on artificial immune networks (AIN), is applied to obtain appropriate centers for remote sensing image classification. In the aiNet-RBF algorihtm, each input pattern corresonds to an antigenic stimulus, while each RBF candidate center is considered to be an element, or cell, of the immune network model. The steps are as follows: A set of candidate centers is initialized at random, where the initial number of candidates and their positions is not crucial to the performance. Then, the clonal selection principle will control which candidates will be selected and how they will be upadated. Note that the clonal selection principle will be responsible for how the centers will represent the training data set. Finally, the immune network will identify and eliminate or suppress self-recognizing individuals to control the number of candidate centers. After the above learning phase, the aiNet network centers represent internal images of the inuput patterns presented to it. The algorithm output is taken to be the matrix of memory cells' coordinates that represent the final centers to be adopted by the RBF network. The stopping criterion of the proposed algorithm is given by a pre
An efficient ensemble of radial basis functions method based on quadratic programming
Shi, Renhe; Liu, Li; Long, Teng; Liu, Jian
2016-07-01
Radial basis function (RBF) surrogate models have been widely applied in engineering design optimization problems to approximate computationally expensive simulations. Ensemble of radial basis functions (ERBF) using the weighted sum of stand-alone RBFs improves the approximation performance. To achieve a good trade-off between the accuracy and efficiency of the modelling process, this article presents a novel efficient ERBF method to determine the weights through solving a quadratic programming subproblem, denoted ERBF-QP. Several numerical benchmark functions are utilized to test the performance of the proposed ERBF-QP method. The results show that ERBF-QP can significantly improve the modelling efficiency compared with several existing ERBF methods. Moreover, ERBF-QP also provides satisfactory performance in terms of approximation accuracy. Finally, the ERBF-QP method is applied to a satellite multidisciplinary design optimization problem to illustrate its practicality and effectiveness for real-world engineering applications.
Petković, Dalibor; Gocic, Milan; Shamshirband, Shahaboddin; Qasem, Sultan Noman; Trajkovic, Slavisa
2016-08-01
Accurate estimation of the reference evapotranspiration (ET0) is important for the water resource planning and scheduling of irrigation systems. For this purpose, the radial basis function network with particle swarm optimization (RBFN-PSO) and radial basis function network with back propagation (RBFN-BP) were used in this investigation. The FAO-56 Penman-Monteith equation was used as reference equation to estimate ET0 for Serbia during the period of 1980-2010. The obtained simulation results confirmed the proposed models and were analyzed using the root mean-square error (RMSE), the mean absolute error (MAE), and the coefficient of determination ( R 2). The analysis showed that the RBFN-PSO had better statistical characteristics than RBFN-BP and can be helpful for the ET0 estimation.
Petković, Dalibor; Gocic, Milan; Shamshirband, Shahaboddin; Qasem, Sultan Noman; Trajkovic, Slavisa
2015-06-01
Accurate estimation of the reference evapotranspiration (ET0) is important for the water resource planning and scheduling of irrigation systems. For this purpose, the radial basis function network with particle swarm optimization (RBFN-PSO) and radial basis function network with back propagation (RBFN-BP) were used in this investigation. The FAO-56 Penman-Monteith equation was used as reference equation to estimate ET0 for Serbia during the period of 1980-2010. The obtained simulation results confirmed the proposed models and were analyzed using the root mean-square error (RMSE), the mean absolute error (MAE), and the coefficient of determination (R 2). The analysis showed that the RBFN-PSO had better statistical characteristics than RBFN-BP and can be helpful for the ET0 estimation.
Radial differential rotation vs surface differential rotation: investigation based on dynamo models
Korhonen, H.; Elstner, D.
2008-01-01
Differential rotation plays a crucial role in the alpha-omega dynamo, and thus also in creation of magnetic fields in stars with convective outer envelopes. Still, measuring the radial differential rotation on stars is impossible with the current techniques, and even the measurement of surface differential rotation is difficult. In this work we investigate the surface differential rotation obtained from dynamo models using similar techniques as are used on observations, and compare the result...
Radial Basis Neural Networks Based Fault Detection and Isolation Scheme for Pneumatic Actuator
K. Prabakaran; S, Kaushik; R, Mouleeshuwarapprabu
2014-01-01
Fault diagnosis is an ongoing significant research field due to the constantly increasing need for maintainability, reliability and safety of industrial plants. The pneumatic actuators are installed in harsh environment: high temperature, pressure, aggressive media and vibration, etc. This influenced the pneumatic actuator predicted life time. The failures in pneumatic actuator cause forces the installation shut down and may also determine the final quality of the product. A Radial Basis Neur...
Palmero, F.; Archilla, J. F. R.; Hennig, D.; Romero, F. R.
2003-01-01
Some recent results for a three--dimensional, semi--classical, tight--binding model for DNA show that there are two types of polarons, named radial and twist polarons, that can transport charge along the DNA molecule. However, the existence of two types of base pairs in real DNA, makes it crucial to find out if charge transport also exist in DNA chains with different base pairs. In this paper we address this problem in its simple case, an homogeneous chain except for a single different base p...
Feature-based pairwise retinal image registration by radial distortion correction
Lee, Sangyeol; Abràmoff, Michael D.; Reinhardt, Joseph M.
2007-03-01
Fundus camera imaging is widely used to document disorders such as diabetic retinopathy and macular degeneration. Multiple retinal images can be combined together through a procedure known as mosaicing to form an image with a larger field of view. Mosaicing typically requires multiple pairwise registrations of partially overlapped images. We describe a new method for pairwise retinal image registration. The proposed method is unique in that the radial distortion due to image acquisition is corrected prior to the geometric transformation. Vessel lines are detected using the Hessian operator and are used as input features to the registration. Since the overlapping region is typically small in a retinal image pair, only a few correspondences are available, thus limiting the applicable model to an afine transform at best. To recover the distortion due to curved-surface of retina and lens optics, a combined approach of an afine model with a radial distortion correction is proposed. The parameters of the image acquisition and radial distortion models are estimated during an optimization step that uses Powell's method driven by the vessel line distance. Experimental results using 20 pairs of green channel images acquired from three subjects with a fundus camera confirmed that the afine model with distortion correction could register retinal image pairs to within 1.88+/-0.35 pixels accuracy (mean +/- standard deviation) assessed by vessel line error, which is 17% better than the afine-only approach. Because the proposed method needs only two correspondences, it can be applied to obtain good registration accuracy even in the case of small overlap between retinal image pairs.
Collision avoidance for a mobile robot based on radial basis function hybrid force control technique
Wen Shu-Huan
2009-01-01
Collision avoidance is always difficult in the planning path for a mobile robot. In this paper, the virtual force field between a mobile robot and an obstacle is formed and regulated to maintain a desired distance by hybrid force control algorithm. Since uncertainties from robot dynamics and obstacle degrade the performance of a collision avoidance task, intelligent control is used to compensate for the uncertainties. A radial basis function (RBF) neural network is used to regulate the force field of an accurate distance between a robot and an obstacle in this paper and then simulation studies are conducted to confirm that the proposed algorithm is effective.
Roohani Ghehsareh, Hadi; Kamal Etesami, Seyed; Hajisadeghi Esfahani, Maryam
2016-08-01
In the current work, the electromagnetic (EM) scattering from infinite perfectly conducting cylinders with arbitrary cross sections in both transverse magnetic (TM) and transverse electric (TE) modes is numerically investigated. The problems of TE and TM EM scattering can be mathematically modelled via the magnetic field integral equation (MFIE) and the electric field integral equation (EFIE), respectively. An efficient technique is performed to approximate the solution of these surface integral equations. In the proposed numerical method, compactly supported radial basis functions (RBFs) are employed as the basis functions. The radial and compactly supported properties of these basis functions substantially reduce the computational cost and improve the efficiency of the method. To show the accuracy of the proposed technique, it has been applied to solve three interesting test problems. Moreover, the method is well used to compute the electric current density and also the radar cross section (RCS) for some practical scatterers with different cross section geometries. The reported numerical results through the tables and figures demonstrate the efficiency and accuracy of the proposed technique.
New P3D Hydraulic Fracturing Model Based on the Radial Flow
鲁连军; 孙逢春; 肖海华; 安申法
2004-01-01
Pseudo three-dimension (P3D) hydraulic fracturing models often overpredict the fracture height for a poorly contained fracture. To solve this problem, a new method is presented in shaping the P3D fracture geometry on the basis of the fundamental theory and the original 1D fluid flow is replaced with a more representatively radial flow. The distribution of the fluid in the modified fluid field is analyzed and a sound explanation to the problem is given. Due to the consideration of the fluid flow in the vertical direction, the modified model can predict the fracture height much better. To validate the rationality of the radial fluid flow assumption, the distribution of the fluid in the modified fluid field is simulated with the plane potential flow by using finite element method. And the results agree effectively with those from the assumption. Through comparing with the full 3D model, the results show that this new P3D model can be used to aid the fracturing design and predict the fracture height under poorly contained situation.
Xie, Miao; Turner, Christopher L. [Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095 (United States); Mohammadi, Reza [Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095 (United States); Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095 (United States); Kaner, Richard B., E-mail: kaner@chem.ucla.edu, E-mail: akavner@ucla.edu, E-mail: tolbert@chem.ucla.edu; Tolbert, Sarah H., E-mail: kaner@chem.ucla.edu, E-mail: akavner@ucla.edu, E-mail: tolbert@chem.ucla.edu [Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095 (United States); Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095 (United States); The California NanoSystems Institute (CNSI), UCLA, Los Angeles, California 90095 (United States); Kavner, Abby, E-mail: kaner@chem.ucla.edu, E-mail: akavner@ucla.edu, E-mail: tolbert@chem.ucla.edu [Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, California 90095 (United States)
2015-07-27
In this work, we explore the hardening mechanisms in WB{sub 4}-based solid solutions upon addition of Ta, Mn, and Cr using in situ radial X-ray diffraction techniques under non-hydrostatic pressure. By examining the lattice-supported differential strain, we provide insights into the mechanism for hardness increase in binary solid solutions at low dopant concentrations. Speculations on the combined effects of electronic structure and atomic size in ternary WB{sub 4} solid solutions containing Ta with Mn or Cr are also included to understand the extremely high hardness of these materials.
In this work, we explore the hardening mechanisms in WB4-based solid solutions upon addition of Ta, Mn, and Cr using in situ radial X-ray diffraction techniques under non-hydrostatic pressure. By examining the lattice-supported differential strain, we provide insights into the mechanism for hardness increase in binary solid solutions at low dopant concentrations. Speculations on the combined effects of electronic structure and atomic size in ternary WB4 solid solutions containing Ta with Mn or Cr are also included to understand the extremely high hardness of these materials
Li, Qiang; Shi, Qian; Wang, Kuihua
2010-06-01
In this study, a simplified computational model of pile vertical vibration was developed. The model was based on the inhomogeneous radial disturbed zone of soil in the vicinity of a pile disturbed by pile driving. The model contained two regions: the disturbed zone, which was located in the immediate vicinity of the pile, and the undisturbed region, external to the disturbed zone. In the model, excess pore pressure in the disturbed zone caused by pile driving was assumed to follow a logarithmic distribution. The relationships of stress and strain in the disturbed zone were based on the principle of effective stress under plain strain conditions. The external zone was governed by the poroelastic theory proposed by Biot. With the use of a variable separation method, an analytical solution in the frequency domain was obtained. Furthermore, a semi-analytical solution was attained by employing a numerical convolution method. Numerical results from the frequency and time domain indicated that the equivalent radius of the disturbed zone and the ratio of excess pore pressure had a significant effect on pile dynamic response. However, actual interactions between pile and soil will be weaker due to the presence of the radial disturbed zone, which is caused by pile driving. Consequently, the ideal undisturbed model overestimates the interaction between pile and soil; however, the proposed model reflects the interaction of pile and soil better than the perfect contact model. Numerical results indicate that the model can account for the time effect of pile dynamic tests.
Acute radial nerve entrapment at the spiral groove: detection by DTI-based neurography
Jengojan, Suren; Breitenseher, Julia; Weber, Michael; Prayer, Daniela; Kasprian, Gregor [Medical University of Vienna, Department of Biomedical Imaging and Image-guided Therapy, Division of Neuro- and Musculosceletal Radiology, Vienna (Austria); Kovar, Florian [Medical University of Vienna, Department of Trauma-Surgery, Vienna (Austria)
2015-06-01
This study evaluated the potential of three-tesla diffusion tensor imaging (DTI) and tractography to detect changes of the radial (RN) and median (MN) nerves during transient upper arm compression by a silicon ring tourniquet. Axial T2-weighted and DTI sequences (b = 700 s/mm{sup 2}, 16 gradient encoding directions) of 13 healthy volunteers were obtained. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values of the MN and RN were measured at the spiral groove and further visualized in 3D by deterministic tractography (thresholds: FA =.15, angle change = 27 ). Local/lesional RN FA values increased (p = 0.001) and ADC values decreased (p = 0.02) during a 20-min upper arm compression, whereas no significant FA (p = 0.49) or ADC (p = 0.73) changes of the MN were detected. There were no T2-w nerve signal changes or alterations of nerve trajectories in 3D. Acute nerve compression of the RN leads to changes of its three-tesla DTI metrics. Peripheral nerve DTI provides non-invasive insights into the ''selective'' vulnerability of the RN at the spiral groove. (orig.)
Acute radial nerve entrapment at the spiral groove: detection by DTI-based neurography
This study evaluated the potential of three-tesla diffusion tensor imaging (DTI) and tractography to detect changes of the radial (RN) and median (MN) nerves during transient upper arm compression by a silicon ring tourniquet. Axial T2-weighted and DTI sequences (b = 700 s/mm2, 16 gradient encoding directions) of 13 healthy volunteers were obtained. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values of the MN and RN were measured at the spiral groove and further visualized in 3D by deterministic tractography (thresholds: FA =.15, angle change = 27 ). Local/lesional RN FA values increased (p = 0.001) and ADC values decreased (p = 0.02) during a 20-min upper arm compression, whereas no significant FA (p = 0.49) or ADC (p = 0.73) changes of the MN were detected. There were no T2-w nerve signal changes or alterations of nerve trajectories in 3D. Acute nerve compression of the RN leads to changes of its three-tesla DTI metrics. Peripheral nerve DTI provides non-invasive insights into the ''selective'' vulnerability of the RN at the spiral groove. (orig.)
Altran, A.B.; Lotufo, A.D.P.; Minussi, C.R. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Ilha Solteira, SP (Brazil). Dept. de Engenharia Eletrica], Emails: lealtran@yahoo.com.br, annadiva@dee.feis.unesp.br, minussi@dee.feis.unesp.br; Lopes, M.L.M. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Ilha Solteira, SP (Brazil). Dept. de Matematica], E-mail: mara@mat.feis.unesp.br
2009-07-01
This paper presents a methodology for electrical load forecasting, using radial base functions as activation function in artificial neural networks with the training by backpropagation algorithm. This methodology is applied to short term electrical load forecasting (24 h ahead). Therefore, results are presented analyzing the use of radial base functions substituting the sigmoid function as activation function in multilayer perceptron neural networks. However, the main contribution of this paper is the proposal of a new formulation of load forecasting dedicated to the forecasting in several points of the electrical network, as well as considering several types of users (residential, commercial, industrial). It deals with the MLF (Multimodal Load Forecasting), with the same processing time as the GLF (Global Load Forecasting). (author)
Clem, Michelle M.; Woike, Mark R.
2013-01-01
and investigated in the controlled experiment. A range of known shifts are induced on the patterns; reference and data images are acquired before and after the induced shift, respectively, and the images are processed using the cross-correlation algorithms in order to determine the particle displacements. The effectiveness of each pattern at resolving the known shift is evaluated and discussed in order to choose the most suitable pattern to be implemented onto a rotating disk in the Rotordynamics Lab. Although testing on the rotating disk has not yet been performed, the driving principles behind the development of the present optical technique are based upon critical aspects of the future experiment, such as the amount of expected radial growth, disk analysis, and experimental design and are therefore addressed in the paper.
Baluev, Roman V
2011-01-01
We use full available array of radial velocity data, including recently published HARPS and Keck observatory sets, to characterize the orbital configuration of the planetary system orbiting GJ876. First, we propose and describe in detail a fast method to fit perturbed orbital configuration, based on the integration of the sensitivity equations inferred by the equations of the original $N$-body problem. Further, we find that it is unsatisfactory to treat the available radial velocity data for GJ876 in the traditional white noise model, because the actual noise appears autocorrelated (and demonstrates non-white frequency spectrum). The time scale of this correlation is about a few days, and the contribution of the correlated noise is about 2 m/s (i.e., similar to the level of internal errors in the Keck data). We propose a variation of the maximum-likelihood algorithm to estimate the orbital configuration of the system, taking into account the red noise effects. We show, in particular, that the non-zero orbital...
A design methodology for a magnetorheological fluid damper based on a multi-stage radial flow mode
Liao, C. R.; Zhao, D. X.; Xie, L.; Liu, Q.
2012-08-01
In this paper, a magnetorheological (MR) fluid damper based on a multi-stage radial flow mode is put forward, compared with traditional ones with annular damping channel which are of low magnetic field utilization and high energy consumption. The equivalent magnetic circuit model is derived, along with the relation between the magnetic induction at the working gap and the exciting current in the field coils. The finite-element software ANYSY is used to analyze the distribution of the magnetic field in the MR valve. The flow differential equation for a MR fluid in radial flow is theoretically set up, and the numerical solution is validated by means of the Herschel-Bulkley constitutive model. A MR damper was designed and fabricated in Chongqing University in accordance with the technical requirements of a railway vehicle anti-yaw damper, and the force-displacement characteristic of the damper was tested with J95-I type shock absorber test-bed. The results show that the experimental damping forces are in good agreement with the analytical ones, and the methodology is believed to help predict the damping force of a MR damper.
A design methodology for a magnetorheological fluid damper based on a multi-stage radial flow mode
In this paper, a magnetorheological (MR) fluid damper based on a multi-stage radial flow mode is put forward, compared with traditional ones with annular damping channel which are of low magnetic field utilization and high energy consumption. The equivalent magnetic circuit model is derived, along with the relation between the magnetic induction at the working gap and the exciting current in the field coils. The finite-element software ANYSY is used to analyze the distribution of the magnetic field in the MR valve. The flow differential equation for a MR fluid in radial flow is theoretically set up, and the numerical solution is validated by means of the Herschel–Bulkley constitutive model. A MR damper was designed and fabricated in Chongqing University in accordance with the technical requirements of a railway vehicle anti-yaw damper, and the force–displacement characteristic of the damper was tested with J95-I type shock absorber test-bed. The results show that the experimental damping forces are in good agreement with the analytical ones, and the methodology is believed to help predict the damping force of a MR damper. (paper)
Almeida, Dilso Corrêa de
2011-01-01
Full Text Available Cursos de Inglês Instrumental são geralmente desenvolvidos de acordo com as necessidades dos alunos. Essas necessidades são definidas com base em levantamentos junto aos aprendizes ou pela análise, por parte do professor/desenvolvedor do material, sobre o uso da linguagem (acadêmica, ocupacional ou vocacional que os aprendizes precisarão desenvolver. Apresentamos, neste artigo, o processo de desenvolvimento do conteúdo programático de um curso de leitura de manuais de manutenção de aeronaves em inglês, tendo a Linguística de Corpus como balizadora da escolha dos aspectos léxico-semântico-gramaticais a serem trabalhados durante o curso.
UM PROCEDIMENTO PARA CALCULAR ÍNDICES A PARTIR DE UMA BASE DE DADOS MULTIVARIADOS
Kubrusly Lucia Silva
2001-01-01
Full Text Available Este trabalho trata do problema de se estabelecer um índice I que possibilite ordenar um conjunto de n objetos, segundo critério definido por um conjunto de m variáveis. De um modo geral, é necessário escolher o conjunto de variáveis adequadas, e também, os pesos atribuídos a cada variável. A Análise de Grupamento é usada para seleção de variáveis, e a Análise de Componentes Principais é usada para fornecer as ponderações. São apresentadas duas aplicações do procedimento proposto.
Radial Nerve Tendon Transfers.
Cheah, Andre Eu-Jin; Etcheson, Jennifer; Yao, Jeffrey
2016-08-01
Radial nerve palsy typically occurs as a result of trauma or iatrogenic injury and leads to the loss of wrist extension, finger extension, thumb extension, and a reduction in grip strength. In the absence of nerve recovery, reconstruction of motor function involves tendon transfer surgery. The most common donor tendons include the pronator teres, wrist flexors, and finger flexors. The type of tendon transfer is classified based on the donor for the extensor digitorum communis. Good outcomes have been reported for most methods of radial nerve tendon transfers as is typical for positional tendon transfers not requiring significant power. PMID:27387076
First ground-based 200-um observing with THUMPER on JCMT - sky characterisation and planet maps
Ward-Thompson, D; Araujo, H; Coulson, I; Cox, J; Davis, G R; Evans, R; Griffin, M J; Gear, W K; Hargrave, P; Hargreaves, P; Hayton, D; Kiernan, B J; Leeks, S J; Mauskopf, P; Naylor, D; Potter, N; Rinehart, S A; Sudiwala, R; Tucker, C R; Walker, R J; Wadtkin, S L
2005-01-01
We present observations that were carried out with the Two HUndred Micron PhotometER (THUMPER) mounted on the James Clerk Maxwell Telescope (JCMT) in Hawaii, at a wavelength of 200 um (frequency 1.5 THz). The observations utilise a small atmospheric window that opens up at this wavelength under very dry conditions at high-altitude observing sites. The atmosphere was calibrated using the sky-dipping method and a relation was established between the optical depth, tau, at 1.5 THz and that at 225 GHz: tau_1.5THz = (95 +/- 10)*tau_225GHz. Mars and Jupiter were mapped from the ground at this wavelength for the first time, and the system characteristics measured. A noise equivalent flux density (NEFD) of ~65 +/- 10 Jy (1 sigma 1 second) was measured for the THUMPER-JCMT combination, consistent with predictions based upon our laboratory measurements. The main-beam resolution of 14 arcsec was confirmed and an extended error-beam detected at roughly two-thirds of the magnitude of the main beam. Measurements of the Sun...
Song, Wooseok; Hwan Kim, Sung; Sung Jung, Dae; Kim, Yooseok; Youn Kim, Soo; An, Ki-Seok; Park, Chong-Yun
2014-11-01
Catalytic nanoparticle (NP) size is the crucial factor that determines carbon nanotube (CNT) diameter. Therefore, we explored the Ostwald ripening phenomenon of catalytic NPs from the radial breathing modes in resonant Raman spectra of synthesized single-walled CNTs (SWCNTs). SWCNTs were synthesized using chemically derived monodisperse Fe oxide catalytic NPs by a conventional thermal chemical vapor deposition system. The density of the NPs was manipulated by simply adjusting the spin-coating speed and cycle. The diameter distribution and tube type (SWCNTs or multi-walled CNTs) were thereby determined, which can be understood by density-dependent Ostwald ripening of the NPs. As a result, the diameter-selective growth of SWCNTs was successfully achieved, which will be useful for SWCNTs-based electronic applications.
Relations between a net electrical output power and dimensions of components in radial build are investigated based on the ITER plasma performance to develop a conceptual design of DEMO with the net electrical output power of several hundred MW. Reducing the dimensions of in-vessel components and increasing the thickness of the toroidal field coil contribute to strengthen the toroidal magnetic field at plasma, which brings about increase in a net electrical output power. The relation between the minimum plasma major radius and the maximum net electrical output power is clarified. Furthermore effects of improvements in the ITER plasma performance on the net electricity are also analyzed; indicating the increase of normalized beta could have advantage from the viewpoint of the divertor heat load because the increase of synchrotron radiation loss power contributes to reduce the divertor heat load, though the higher energy confinement is required
Lei Wang; Cheng Shao; Hai Wang; Hong Wu
2006-01-01
Membrane technology has found wide applications in the petrochemical industry, mainly in the purification and recovery of the hydrogen resources. Accurate prediction of the membrane separation performance plays an important role in carrying out advanced process control (APC). For the first time, a soft-sensor model for the membrane separation process has been established based on the radial basis function (RBF) neural networks. The main performance parameters, i.e, permeate hydrogen concentration, permeate gas flux, and residue hydrogen concentration, are estimated quantitatively by measuring the operating temperature, feed-side pressure, permeate-side pressure, residue-side pressure, feed-gas flux, and feed-hydrogen concentration excluding flow structure, membrane parameters, and other compositions. The predicted results can gain the desired effects. The effectiveness of this novel approach lays a foundation for integrating control technology and optimizing the operation of the gas membrane separation process.
A Concept for Monitoring Radial Distribution networks Based on Very Few Measurements
Munk, Steen Michael; Sørensen, John Aasted
In Denmark as well as the rest of Europe, powerdistribution utilities are becoming interested inmonitoring the medium voltage network.The paper treats the problem of extracting information on faults based on measurements fromone observation point.......In Denmark as well as the rest of Europe, powerdistribution utilities are becoming interested inmonitoring the medium voltage network.The paper treats the problem of extracting information on faults based on measurements fromone observation point....
Baluev, Roman V.
2011-10-01
We use full available array of radial velocity data, including recently published HARPS and Keck observatory sets, to characterize the orbital configuration of the planetary system orbiting GJ876. First, we propose and describe in detail a fast method to fit perturbed orbital configuration, based on the integration of the sensitivity equations inferred by the equations of the original N-body problem. Further, we find that it is unsatisfactory to treat the available radial velocity data for GJ876 in the traditional white noise model, because the actual noise appears autocorrelated (and demonstrates non-white frequency spectrum). The time scale of this correlation is about a few days, and the contribution of the correlated noise is about 2 m/s (i.e., similar to the level of internal errors in the Keck data). We propose a variation of the maximum-likelihood algorithm to estimate the orbital configuration of the system, taking into account the red noise effects. We show, in particular, that the non-zero orbital eccentricity of the innermost planet d, obtained in previous studies, is likely a result of misinterpreted red noise in the data. In addition to offsets in some orbital parameters, the red noise also makes the fit uncertainties systematically underestimated (while they are treated in the traditional white noise model). Also, we show that the orbital eccentricity of the outermost planet is actually ill-determined, although bounded by ~0.2. Finally, we investigate possible orbital non-coplanarity of the system, and limit the mutual inclination between the planets b and c orbits by 5°-15°, depending on the angular position of the mutual orbital nodes.
Cristiano do Nascimento; Alessandra Vasconcelos Gallon
2008-01-01
Esta pesquisa, efetuada junto aos pequenos produtores catarinenses de moluscos cultivados no mar (mexilhão e ostra), objetivou investigar sobre a utilização dos dados e informações contábeis na condução de seus negócios. Para isto, realizouse um estudo exploratório-descritivo, com abordagem dos dados predominantemente qualitativa, por meio de um estudo multicaso. Os dados coletados em 29 unidades produtoras de moluscos, via questionário aplicado entre agosto e outubro de 2007, abordam aspecto...
Prevalência de transtornos ansiosos e algumas comorbidades em idosos: um estudo de base populacional
Mayara B. Machado
2016-03-01
Full Text Available RESUMO Objetivo Avaliar a prevalência de transtornos ansiosos e fatores associados em uma amostra populacional de idosos do Sul de Santa Catarina. Métodos Estudo transversal com base em dados populacionais, que avaliou 1.021 indivíduos idosos entre 60 e 79 anos. Foram realizadas entrevistas domiciliares para aferição de variáveis sobre transtornos ansiosos, por meio do questionário MINI, dados sociodemográficos, hipertensão arterial sistêmica (HAS, infarto agudo do miocárdio (IAM e dosagem de colesterol. Resultados As prevalências entre os transtornos ansiosos foram de 22,0% para o transtorno de ansiedade generalizada (TAG; 14,8% para fobia social (FS; 10,5% para transtorno do pânico (TP; e 8,5% para o transtorno obsessivo-compulsivo (TOC. Além disso, 40,5% dos indivíduos apresentaram pelo menos um transtorno de ansiedade. A distribuição dos transtornos foi semelhante nos dois gêneros; TAG foi mais prevalente nos indivíduos de menor escolaridade; TOC foi mais presente em indivíduos casados ou em união estável. Em relação às variáveis clínicas, HAS foi associada à presença de TOC; FS foi associada com IAM; TOC e FS foram associados com HDL > 40 mg/dL. Conclusão Os dados demonstram que os quadros de ansiedade são muito frequentes em idosos da comunidade, se sobrepõem de forma significativa e estão associados a algumas variáveis clínicas cardiovasculares.
Mauro Fernando Ferreira
2000-12-01
Full Text Available Diferentes combinações de pressões internas dos pneus do trator pode afetar a interferência entre eixos motrizes dos tratores agrícolas, principalmente com pneus do tipo radial. Um trator 4x2 com tração dianteira auxiliar foi analisado quanto a seu desempenho em tração. Pneus de carcaça radial com diferentes pressões internas foram utilizados, com o objetivo de variar as relações cinemá ticas entre os eixos. Mediram-se o patinamento das rodas dianteiras e traseiras, a resistência ao rolamento e a força de tração, em duas condições de solo (firme e solto. Os resultados obtidos permitiram verificar que a eficiência de tração não foi significativamente influenciada pela variação das relações cinemáticas de 0,962 a 1,102. As máximas eficiências de tração ocorreram com relaçõ es cinemáticas variáveis dentro da faixa estudada e de acordo com as cargas impostas à barra de tração.Different combinations of tractor tire inflating pressure may affect interference between tractor axles, mainly with radial tires type. A front wheel assist tractor was studied in its traction performance. Radial tires with different inflation pressure were used, changing kinematic relations between axles. The measured parameters were: front and rear slip, rolling resistence and drawbar pull in two soil conditions (firm and loose. The results indicate that traction efficience was not significantly influenced by kinematic relations variation between 0.962 to 1.102. The maximum traction efficiency ocurred within the range studied and according to drawbar pull.
Elaine Maria Bessa Rebello Guerreiro
2012-01-01
http://dx.doi.org/10.5902/4415Os recentes avanços na política para atendimento da pessoa com deficiência no Brasil têm aproximado várias áreas do conhecimento. Profissionais de diversos ramos (arquitetura, engenharia e direito, por exemplo) participam do debate trazendo enriquecimento para a área da educação, bem como levantando questões sobre a sua prática. Levando em consideração que a educação é um direito social e a acessibilidade é um direito constitucional, buscou-se identificar essa in...
Qiu, Cheng-Wei; Novitsky, Andrey V.; Ma, Hua; Qu, Shaobo
2009-01-01
An analytical method of electromagnetic wave interactions with a general radially anisotropic cloak is established. It is able to deal with arbitrary parameters ($\\epsilon_r(r)$, $\\mu_r(r)$, $\\epsilon_t(r)$ and $\\mu_t(r)$) of a radially anisotropic inhomogeneous shell. The general cloaking condition is proposed from the wave relations for the first time. We derive the parameters of a novel class of spherical nonlinear cloaks and examine its invisibility performance by the proposed method at v...
Ebtehaj, Isa; Bonakdari, Hossein; Zaji, Amir Hossein
2016-01-01
In this study, an expert system with a radial basis function neural network (RBF-NN) based on decision trees (DT) is designed to predict sediment transport in sewer pipes at the limit of deposition. First, sensitivity analysis is carried out to investigate the effect of each parameter on predicting the densimetric Froude number (Fr). The results indicate that utilizing the ratio of the median particle diameter to pipe diameter (d/D), ratio of median particle diameter to hydraulic radius (d/R) and volumetric sediment concentration (C(V)) as the input combination leads to the best Fr prediction. Subsequently, the new hybrid DT-RBF method is presented. The results of DT-RBF are compared with RBF and RBF-particle swarm optimization (PSO), which uses PSO for RBF training. It appears that DT-RBF is more accurate (R(2) = 0.934, MARE = 0.103, RMSE = 0.527, SI = 0.13, BIAS = -0.071) than the two other RBF methods. Moreover, the proposed DT-RBF model offers explicit expressions for use by practicing engineers. PMID:27386995
Jingwen Tian
2013-02-01
Full Text Available Since the control system of the welding gun pose in whole‐position welding is complicated and nonlinear, an intelligent control system of welding gun pose for a pipeline welding robot based on an improved radial basis function neural network (IRBFNN and expert system (ES is presented in this paper. The structure of the IRBFNN is constructed and the improved genetic algorithm is adopted to optimize the network structure. This control system makes full use of the characteristics of the IRBFNN and the ES. The ADXRS300 micro‐mechanical gyro is used as the welding gun position sensor in this system. When the welding gun position is obtained, an appropriate pitch angle can be obtained through expert knowledge and the numeric reasoning capacity of the IRBFNN. ARM is used as the controller to drive the welding gun pitch angle step motor in order to adjust the pitch angle of the welding gun in real‐time. The experiment results show that the intelligent control system of the welding gun pose using the IRBFNN and expert system is feasible and it enhances the welding quality. This system has wide prospects for application.
Yang, Yanchao; Jiang, Hong; Liu, Congbin; Lan, Zhongli
2013-03-01
Cognitive radio (CR) is an intelligent wireless communication system which can dynamically adjust the parameters to improve system performance depending on the environmental change and quality of service. The core technology for CR is the design of cognitive engine, which introduces reasoning and learning methods in the field of artificial intelligence, to achieve the perception, adaptation and learning capability. Considering the dynamical wireless environment and demands, this paper proposes a design of cognitive engine based on the rough sets (RS) and radial basis function neural network (RBF_NN). The method uses experienced knowledge and environment information processed by RS module to train the RBF_NN, and then the learning model is used to reconfigure communication parameters to allocate resources rationally and improve system performance. After training learning model, the performance is evaluated according to two benchmark functions. The simulation results demonstrate the effectiveness of the model and the proposed cognitive engine can effectively achieve the goal of learning and reconfiguration in cognitive radio.
Kewei, E; Zhang, Chen; Li, Mengyang; Xiong, Zhao; Li, Dahai
2015-08-10
Based on the Legendre polynomials expressions and its properties, this article proposes a new approach to reconstruct the distorted wavefront under test of a laser beam over square area from the phase difference data obtained by a RSI system. And the result of simulation and experimental results verifies the reliability of the method proposed in this paper. The formula of the error propagation coefficients is deduced when the phase difference data of overlapping area contain noise randomly. The matrix T which can be used to evaluate the impact of high-orders Legendre polynomial terms on the outcomes of the low-order terms due to mode aliasing is proposed, and the magnitude of impact can be estimated by calculating the F norm of the T. In addition, the relationship between ratio shear, sampling points, terms of polynomials and noise propagation coefficients, and the relationship between ratio shear, sampling points and norms of the T matrix are both analyzed, respectively. Those research results can provide an optimization design way for radial shearing interferometry system with the theoretical reference and instruction. PMID:26367882
Gamma-ray irradiation hardness of arrayed silicon microhole-based radial p–n junction solar cells
The γ-ray irradiation hardness of arrayed silicon microhole-based radial p–n junction (ASMRJ) solar cells (SCs) has been experimentally studied. It was found that the sidewall morphology of the microhole arrays had an important effect on the radiation hardness, so the 4 µm-pitch ASMRJ SCs with hole arrays' sidewalls both unpassivated and passivated were made and referred to as 4 µm-U-ASMRJ and -P-ASMRJ SCs, respectively. On increasing the radiation doses, in contrast with the monotonous and rapid degradation of short circuit current density and open circuit voltage for the planar SCs, these parameters for the 4 µm-U-ASMRJ SCs show a small increase in the initial stage of γ-ray irradiation and then a slow decline. Average conversion efficiency shows an initial slight ascent by 4.5%. Additionally, the average conversion efficiency for the 2 µm-U-ASMRJ SCs shows an initial slight ascent by 5.7%. When the radiation doses grow to 8 × 106 rad, the average conversion efficiency degradation rates for the 2 µm- and 4 µm-U-ASMRJ SCs are 14% and 15%, respectively, whereas it is 39% for the planar SCs. The radiation-gettering mechanism is suggested to explain the radiation-hardened properties of the U-ASMRJ SCs. (paper)
Gabert, P-E; Lievain, L; Vallée, A; Joly, P; Auquit Auckbur, I
2016-08-01
Mycobacterium marinum is an atypical and non-tuberculosis mycobacterium that mainly leads to cutaneous infections. Infections occur through inoculation of the organism through injury to the skin in the presence of contaminated water or fish. The patient often presents with unspecific symptoms and the evolution, in the absence of adequate treatment, is characterized by an expansion of the cutaneous lesion and a spread to deep structures. Infections of tendon sheaths and joints are described, rarely osteomyelitis. Sure diagnosis is hard to obtain and is established from the medical history and microbiological examination. There are no specific therapeutic guidelines. Double or triple antibiotherapy is often effective and should be continued several months after complete resolution of clinical signs. Surgical debridement is required in cases of invasive or resistant infections. We report the case of a young immunocompetent fishmonger with a rare osteocutaneous M. marinum infection of the elbow. Treatment included large surgical excision of infected skin and bone areas and a triple antibiotics administration. Reconstruction have been ensured by a radial collateral artery perforator-based propeller flap, satisfying appropriates functional and cosmetical concerns of this anatomical region. Surgery and appropriate antibiotics treatment were effective and allowed healing of an invasive cutaneous and bone M. marinum infection. PMID:26748858
Anitha, J.; Vijila, C. Kezi Selva; Hemanth, D. Jude
2010-02-01
Diabetic retinopathy (DR) is a chronic eye disease for which early detection is highly essential to avoid any fatal results. Image processing of retinal images emerge as a feasible tool for this early diagnosis. Digital image processing techniques involve image classification which is a significant technique to detect the abnormality in the eye. Various automated classification systems have been developed in the recent years but most of them lack high classification accuracy. Artificial neural networks are the widely preferred artificial intelligence technique since it yields superior results in terms of classification accuracy. In this work, Radial Basis function (RBF) neural network based bi-level classification system is proposed to differentiate abnormal DR Images and normal retinal images. The results are analyzed in terms of classification accuracy, sensitivity and specificity. A comparative analysis is performed with the results of the probabilistic classifier namely Bayesian classifier to show the superior nature of neural classifier. Experimental results show promising results for the neural classifier in terms of the performance measures.
Singularidades do envelhecimento: reflexões com base em conversas com um idoso institucionalizado
Lilian Juana Levenbach de Gamburgo
2009-03-01
Full Text Available Este artigo trata de algumas peculiaridades da vida de um idoso que mora numa Instituição de Longa Permanência, entrevistado no contexto de uma pesquisa cujo objetivo foi a linguagem como prática dialógica de idosos com as capacidades comunicativas preservadas. A narrativa nos permitiu conhecer as condições de vida e algumas especificidades tais como: (1 a institucionalização precoce; (2 a interdependência entre os motivos para o asilamento voluntário e a situação de abandono; (3 a aparente impropriedade de utilizar a categoria "idosos" para englobar sujeitos com idades muito diversas. Foram entrevistados cinco mulheres e um homem. As entrevistas propiciaram o exame de lembranças, sentimentos, valores, relações interpessoais e da própria linguagem. Esperamos oferecer subsídios para um olhar sobre a comunicação do idoso que a considera como sistema simbólico fundamental para a inserção social, olhar diverso daquele centrado nas alterações consideradas "típicas" da velhice.
A questionnaire-based (UM-PDHQ study of hallucinations in Parkinson's disease
Nation Daniel
2008-06-01
Full Text Available Abstract Background Hallucinations occur in 20–40% of PD patients and have been associated with unfavorable clinical outcomes (i.e., nursing home placement, increased mortality. Hallucinations, like other non-motor features of PD, are not well recognized in routine primary/secondary clinical practice. So far, there has been no instrument for uniform characterization of hallucinations in PD. To this end, we developed the University of Miami Parkinson's disease Hallucinations Questionnaire (UM-PDHQ that allows comprehensive assessment of hallucinations in clinical or research settings. Methods The UM-PDHQ is composed of 6 quantitative and 14 qualitative items. For our study PD patients of all ages and in all stages of the disease were recruited over an 18-month period. The UPDRS, MMSE, and Beck Depression and Anxiety Inventories were used for comparisons. Results and Discussion Seventy consecutive PD patients were included in the analyses. Thirty-one (44.3% were classified as hallucinators and 39 as non-hallucinators. No significant group differences were observed in terms of demographics, disease characteristics, stage, education, depressive/anxiety scores or cognitive functioning (MMSE between hallucinators and non-hallucinators. Single mode hallucinations were reported in 20/31 (visual/14, auditory/4, olfactory/2 whereas multiple modalities were reported in 11/31 patients. The most common hallucinatory experience was a whole person followed by small animals, insects and reptiles. Conclusion Using the UM-PDHQ, we were able to define the key characteristics of hallucinations in PD in our cohort. Future directions include the validation of the quantitative part of the questionnaire than will serve as a rating scale for severity of hallucinations.
First ground-based 200-um observing with THUMPER on JCMT - sky characterisation and planet maps
Ward-Thompson, D.; Ade, P.A.R.; Araujo, H; Coulson, I.; Cox, J; Davis, G R; Evans, Rh.; Griffin, M.J.; Gear, W. K.; Hargrave, P.; Hargreaves, P.; Hayton, D.; Kiernan, B. J.; Leeks, S. J.; Mauskopf, P.
2005-01-01
We present observations that were carried out with the Two HUndred Micron PhotometER (THUMPER) mounted on the James Clerk Maxwell Telescope (JCMT) in Hawaii, at a wavelength of 200 um (frequency 1.5 THz). The observations utilise a small atmospheric window that opens up at this wavelength under very dry conditions at high-altitude observing sites. The atmosphere was calibrated using the sky-dipping method and a relation was established between the optical depth, tau, at 1.5 THz and that at 22...
Radial reflection diffraction tomography
Lehman, Sean K.
2012-12-18
A wave-based tomographic imaging method and apparatus based upon one or more rotating radially outward oriented transmitting and receiving elements have been developed for non-destructive evaluation. At successive angular locations at a fixed radius, a predetermined transmitting element can launch a primary field and one or more predetermined receiving elements can collect the backscattered field in a "pitch/catch" operation. A Hilbert space inverse wave (HSIW) algorithm can construct images of the received scattered energy waves using operating modes chosen for a particular application. Applications include, improved intravascular imaging, bore hole tomography, and non-destructive evaluation (NDE) of parts having existing access holes.
Transição para agricultura de base ecológica: um processo social.
Pacífico, Daniela A.; Soglio, Fábio Kessler Dal
2010-01-01
O presente artigo tem como objetivo analisar o projeto de transição para uma cafeicultura orgânica que foi realizado em duas comunidades rurais no norte do estado do Paraná, em 2003. A partir da pesquisa de campo e das consultas bibliográficas sobre a Agroeocologia e a perspectiva teórica orientada pelo ator (POA) constatou-se que o método de transição, ao se utilizar de um modelo preestabelecido de atividades de transição, impossibilitou a participação do ator social e não contribuiu com o p...
2014-01-01
This paper proposed a novel radial basis function (RBF) neural network model optimized by exponential decreasing inertia weight particle swarm optimization (EDIW-PSO). Based on the inertia weight decreasing strategy, we propose a new Exponential Decreasing Inertia Weight (EDIW) to improve the PSO algorithm. We use the modified EDIW-PSO algorithm to determine the centers, widths, and connection weights of RBF neural network. To assess the performance of the proposed EDIW-PSO-RBF model, we choo...
Time variation of the O/H radial gradient in the galactic disk based on planetary nebulae
Maciel, W J
2013-01-01
The controversy on the time variation of the radial abundance gradients can in principle be settled by estimating the gradients from planetary nebulae (PN) ejected by central stars (CSPN) with different ages. In this work, we consider four samples of CSPN whose lifetimes have been estimated using three different methods and estimate the oxygen abundance gradients for these objects. The results suggest some small differences between the younger and older CSPN. The younger objects have similar or slightly higher oxygen abundances compared with the older objects, and the gradients of both groups are similar within the uncertainties. Therefore, the O/H radial gradient has not changed appreciably during the lifetime of the objects considered, so that PN gradients are not expected to be very different from the gradients observed in younger objects, which seems to be supported by recent observational data.
Bases de um novo contrato social? Impostos e Orçamento Participativo em Porto Alegre
Marcello Baquero
2005-03-01
Full Text Available Apesar do crescente interesse por formas alternativas de participação política, entre as quais o Orçamento Participativo (OP, pouco se tem estudado se essas novas modalidades estão incidindo na estruturação de um contrato social mais eficiente e duradouro. Talvez tal situação seja atribuída ao fato de que se considera que o pagamento de tributos é uma obrigação legal e, portanto haveria pouco a ser analisado neste terreno. A perspectiva deste artigo é distinta, argumenta-se que a forma como os cidadãos se posicionam a respeito do pagamento de impostos relaciona-se com outros domínios da política, tais como a confiança institucional e os níveis de envolvimento político. Por meio de uma pesquisa tipo survey os resultados deste estudo apontam para a existência de uma dimensão estrutural negativa no que se refere ao pagamento de tributos, fragilizando o contrato social vigente.In spite of the growing interest about alternative forms of political participation, among which the participatory budget (OP, we know little about how this form of involvement is affecting the structuring of a more efficient social contract. Such situation, perhaps, is due to the fact that the payment of taxes is considered a legal obligation; therefore, the argument is that there would be little to be studied on this field. This article argues that how citizens position themselves about the payment of taxes influences other domains of politics, such as institutional trust and levels of political involvement. Through a survey with porto-alegrenses, the results indicate that the existence of a negative structural dimension insofar as payment of taxes is concerned undermines the actual social contract.
Highlights: • The Tau-Chebyshev method solves the linear fluid flow equations in spherical shells. • The fluid motion is driven by a central force proportional to the radial position. • The full Navier–Stokes equations are solved by the spectral element method. • The linear results are verified with the solution of the Navier–Stokes equations. • The solution of the linear problems is used to initiate non-linear calculations. -- Abstract: The onset of thermal convection in a non-rotating spherical shell is investigated using linear theory. The Tau-Chebyshev spectral method is used to integrate the linearized equations. We investigate the onset of thermal convection by considering two cases of the radial gravitational field (i) a local acceleration, acting radially inward, that is proportional to the distance from the center r, and (ii) a radial gravitational central force that is proportional to r−n. The former case has been widely analyzed in the literature, because it constitutes a simplified model that is usually used, in astrophysics and geophysics, and is studied here to validate the numerical method. The latter case was analyzed since the case n = 5 has been experimentally realized (by means of the dielectrophoretic effect) under microgravity condition, in the experimental container called GeoFlow, inside the International Space Station. Our study is aimed to clarify the role of (i) a radially inward central force (either proportional to r or to r−n), (ii) a base conductive temperature distribution provided by either a uniform heat source or an imposed temperature difference between outer and inner spheres, and (iii) the aspect ratio η (ratio of the radii of the inner and outer spheres), on the critical Rayleigh number. In all cases the surface of the spheres has been assumed to be rigid. The results obtained with the linear theory based on the Tau-Chebyshev spectral method are compared with those of the integration of the full non
Improving energy efficiency and productivity is one of the most cost-effective ways for achieving the sustainable development target in China. This paper employs non-radial directional distance function approach to empirically investigate energy efficiency and energy productivity by including CO2 emissions as an undesirable output. Three production scenarios, namely energy conservation (EC), energy conservation and emission reduction (ECER), and energy conservation, emission reduction and economic growth (ECEREG), are specified to assess China's energy efficiency and productivity growth during the period of Eleventh Five-Year Plan. Our empirical results show that there exist substantial differences in China's total-factor energy efficiency and productivity under different scenarios. Under the ECEREG scenario, the national average total-factor energy efficiency score was 0.6306 in 2005–2010, while the national average total-factor energy productivity increased by 0.27% annually during the period. The main driving force for energy productivity growth in China was energy technological change rather than energy efficiency change. - Highlights: • China's regional energy efficiency and productivity in 2005–2010 are evaluated. • Three production scenarios are considered. • Non-radial directional distance function with CO2 emissions is employed. • Technological change is the main driver for China's energy productivity growth
Clem, Michelle M.; Woike, Mark R.; Abdul-Aziz, Ali
2014-04-01
The Aeronautical Sciences Project under NASA's Fundamental Aeronautics Program is interested in the development of novel measurement technologies, such as optical surface measurements for the in situ health monitoring of critical constituents of the internal flow path. In situ health monitoring has the potential to detect flaws, i.e. cracks in key components, such as engine turbine disks, before the flaws lead to catastrophic failure. The present study, aims to further validate and develop an optical strain measurement technique to measure the radial growth and strain field of an already cracked disk, mimicking the geometry of a sub-scale turbine engine disk, under loaded conditions in the NASA Glenn Research Center's High Precision Rotordynamics Laboratory. The technique offers potential fault detection by imaging an applied high-contrast random speckle pattern under unloaded and loaded conditions with a CCD camera. Spinning the cracked disk at high speeds (loaded conditions) induces an external load, resulting in a radial growth of the disk of approximately 50.0-μm in the flawed region and hence, a localized strain field. When imaging the cracked disk under static conditions, the disk will be undistorted; however, during rotation the cracked region will grow radially, thus causing the applied particle pattern to be `shifted'. The resulting particle displacements between the two images is measured using the two-dimensional cross-correlation algorithms implemented in standard Particle Image Velocimetry (PIV) software to track the disk growth, which facilitates calculation of the localized strain field. A random particle distribution is adhered onto the surface of the cracked disk and two bench top experiments are carried out to evaluate the technique's ability to measure the induced particle displacements. The disk is shifted manually using a translation stage equipped with a fine micrometer and a hotplate is used to induce thermal growth of the disk, causing the
A methodology based on Fuzzy Logic for the construction of the objective function of the optimization problems of nuclear fuel is described. It was created an inference system that responds, in certain form, as a human expert when it has the task of qualifying different radial designs of fuel cells. Specifically it is detailed how an inference system based based on Fuzzy Logic that has five enter variables and one exit variable was built, which corresponds to the objective function for the radial design of a fuel cell for a BWR. The use of Fuzzy with Mat lab offered the visualization capacity of the exit variable in function of one or two enter variables at the same time. This allowed to build, in appropriate way, the combination of the inference rules and the membership functions of those diffuse sets used for each one of the enter variables. The obtained objective function was used in an optimization process based on Taboo search. The new methodology was proven for the design of a cell used in a fuel assemble of the Laguna Verde reactor obtaining excellent results. (Author)
Ho, Bo-Yan; Peng, Fenglin; Wu, Shin-Tson; Hwang, Shug-June
2016-07-01
We demonstrate a high sensitivity all-fiber Mach–Zehnder interferometer (MZI) based on radial-aligned liquid crystal (LC) in a hollow optical fiber (HOF). The transmission spectrum of the liquid crystal-filled fiber MZI (LCF-MZI) was measured at different temperatures, and the thermal-induced wavelength shift of the interference spectrum probed. The experimental results indicate that the LC alignment and refractive indices inside the hollow capillary are significantly influenced by the temperature, which in turn changes the optical properties of LCF-MZI. Our experimental data on notch wavelength shift agree well with the measured refractive index temperature gradient.
Juvenal Soares Dias da Costa; Maria Teresa Anselmo Olinto; Maria Cecília Formoso Assunção; Denise Petrucci Gigante; Silvia Macedo; Ana Maria Baptista Menezes
2006-01-01
OBJETIVO: Comparar a prevalência de Diabetes Mellitus em população adulta, residente em área urbana, segundo auto-referência e valores de exame de glicemia de jejum. MÉTODOS: Realizou-se um estudo transversal de base populacional, com 1.968 pessoas de 20 a 69 anos, residentes na zona urbana da cidade de Pelotas, Estado do Rio Grande do Sul, em 2000. Estimou-se uma amostra de 1.800 indivíduos. Realizaram-se visitas domiciliares em 40 setores censitários sorteados aleatoriamente. Foi aplicado u...
Acatrinei, C S
2001-01-01
We study radial waves in (2+1)-dimensional noncommutative scalar field theory, using operatorial methods. The waves propagate along a discrete radial coordinate and are described by finite series deformations of Bessel-type functions. At large radius with respect to the noncomutativity scale $\\theta$, the waves behave like the usual commutative ones.
Acatrinei, Ciprian
2001-01-01
We study radial waves in (2+1)-dimensional noncommutative scalar field theory, using operatorial methods. The waves propagate along a discrete radial coordinate and are described by finite series deformations of Bessel-type functions. At radius much larger than the noncommutativity scale $\\sqrt{\\theta}$, one recovers the usual commutative behaviour. At small distances, classical divergences are smoothed out by noncommutativity.
Ebert, Todd A; Carella, John A
2012-03-13
A triple acting radial seal used as an interstage seal assembly in a gas turbine engine, where the seal assembly includes an interstage seal support extending from a stationary inner shroud of a vane ring, the interstage seal support includes a larger annular radial inward facing groove in which an outer annular floating seal assembly is secured for radial displacement, and the outer annular floating seal assembly includes a smaller annular radial inward facing groove in which an inner annular floating seal assembly is secured also for radial displacement. A compliant seal is secured to the inner annular floating seal assembly. The outer annular floating seal assembly encapsulates the inner annular floating seal assembly which is made from a very low alpha material in order to reduce thermal stress.
a base teórico-metodológica de um estudo
Cecília Goulart
2006-01-01
Full Text Available El estudio presenta la discusión de la base teórica de una pesquisa realizada con diez niños de 4 y 5 años de una guardería universitaria, cuyo objetivo es investigar aspectos del proceso de letramiento de estos niños en el espacio educativo y en el espacio familiar. Se consideró la participación de los niños en eventos de letramiento, sus relaciones con objetos, actividades y procedimientos, producidos o atravesados por la cultura escrita y aspectos del movimiento discursivo que ocurrían en las familias y en la guardería. Se discuten y entrelazan estudios sobre la relación oral-escrita y estudios que, presentando una concepción social y dialoguista del lenguaje, nos llevan a un modo de concebir la noción de letramiento, con base, principalmente, en los conceptos bakhtinianos de lenguajes sociales, géneros del discurso, heteroglosa e hibridación. Tal discusión es básica en la pesquisa para la definición de categorías analíticas que muestren diferentes modos de ser letrado. Se busca profundar la comprensión sobre el papel de la escuela y de la familia en el proceso de letramiento.
GAIA Spectroscopy and Radial Velocities
Munari, U
2001-01-01
GAIA spectroscopic and radial velocity performancies are reviewed on the base of ground-based test observations and simulations. The prospects for accurate analysis of stellar atmospheres (temperature, gravity, chemical abundances, rotation, peculiarities) and precise radial velocities (single stars, binaries, pulsating stars) are colorful provided the spectral dispersion is high enough. A higher dispersions also favors a given precision of radial velocities to be reached at fainter magnitudes: for example, with current parameters for GAIA spectrograph, a 1 km/sec accuracy on epoch RVs of a K0 star is reached at V~13.0 mag with 0.25 Ang/pix dispersion spectra, at V~10.3 mag for 0.5 Ang/pix, and V~6.7 mag for 1 Ang/pix. GAIA radial velocities for single stars can match the ~0.5 km/sec mean accuracy of tangential motions at V=15 mag, provided the observations are performed at a dispersion not less than 0.5 Ang/pix.
Leonardo de A. Monteiro
2011-06-01
Full Text Available A utilização correta de pneus em tratores, tanto em relação ao seu tipo quanto à calibração de sua pressão interna, e a lastragem ideal para cada condição de carga são fatores que influem significativamente no desempenho do trator. Esta pesquisa teve como objetivo comparar o desempenho de um trator equipado com pneus radiais e com pneus diagonais, para três condições de lastragem líquida (0%, 40% e 75% de água, em três condições superficiais de um Nitossolo Vermelho distrófico (superfície firme, preparada e com cobertura vegetal de resto de milho e em três velocidades teóricas de deslocamento (4 km h-1, 5 km h-1 e 7 km h-1, informadas no painel do trator, correspondendo às marchas B1, B2 e C1. O melhor desempenho do trator, equipado com pneu diagonal, ocorreu na condição de 75% de água nos pneus, apresentando maior velocidade de deslocamento, menor patinhagem do trator, menor consumo horário de combustível e gerando maior potência na barra de tração. Com pneus radiais, o melhor desempenho do trator ocorreu na condição de 40% de água nos pneus, proporcionando maiores velocidades de deslocamento do trator, menores patinhagens, menores consumos, horário e específico de combustível, e maiores potência e rendimento na barra de tração.The correct use of tires, as for its construction type as for internal pressure calibration and the optimal weighting for each load condition are factors that impact significantly on their performance. This study aimed to compare the performance of a tractor equipped with radial tires and bias ply tires in three conditions of liquid ballast (0%, 40% and 75% water, three surface conditions of a Dystrophic Red Alfisol (firm surface, tillage surface and surface with corn residues coverage and three theoretical traveling speeds (4 km h-1, 5 km h-1 and 7 km h-1, as indicated at the tractor display, related to the gear boxes B1, B2 and C1. The best tractor's performance, equipped with
Saúde coletiva, território e conflitos ambientais: bases para um enfoque socioambiental crítico
Marcelo Firpo de Souza Porto
2014-10-01
Full Text Available O fenômeno da globalização e o crescimento do neoextrativismo na periferia global intensificam a demanda por novos territórios e recursos naturais à economia, resultando em significativos impactos sobre os ecossistemas e a vida das populações vulnerabilizadas. Consideramos que a crise socioambiental impõe novos desafios e exige uma reatualização das bases teórico-metodológicas da saúde coletiva e dos determinantes sociais da saúde. O objetivo deste artigo é apresentar aportes teóricos para a construção de um enfoque socioambiental crítico a partir de uma revisão bibliográfica orientada por experiências anteriores de mapeamento de conflitos ambientais e pela realização de estudos empíricos em áreas conflituosas. Apresentamos contribuições de disciplinas como a sociologia, a ecologia política, os estudos pós-coloniais e a geografia, para a discussão da determinação socioambiental da saúde, bem como experiências de construção de conhecimentos emancipatórios que integram sujeitos políticos, resistências e alternativas para a sociedade.
Consumo de carnes por adultos do sul do Brasil: um estudo de base populacional
Bruna Celestino Schneider
2014-08-01
Full Text Available Estudo transversal de base populacional que avaliou indivíduos com 20 anos ou mais, residentes na zona urbana de Pelotas, Rio Grande do Sul, que objetivou descrever a frequência do consumo de carnes e o hábito de consumi-las com excesso de gordura. Foi avaliado, no último ano, o consumo de carnes vermelhas (com osso, bife e carne moída, brancas (frango e peixes, vísceras e embutidos. Dos 2,730 entrevistados, 99,1% (IC95%, 98,7 - 99,5 consumiu algum tipo de carne no último ano, sendo que, em torno de 32% referiu consumo diário. A prevalência do consumo de carnes vermelhas (99,3%, IC95%, 98,9 - 99,6 e brancas (99,4% IC95%, 99,1 - 99,7 foi semelhante. A carne de frango foi a mais consumida (98,0%, IC95%, 97,4 - 98,5, enquanto que as vísceras, as menos (59,1% IC95% 56,4 - 61,7. Os embutidos, consumidos por 85,5% (IC95%, 83,7 - 87,2 das pessoas, apresentaram a maior prevalência de consumo diário (16,6%. As carnes com excesso de gordura foram consumidas por 52,3% (IC95%, 49,8 - 54,8 dos adultos, principalmente homens, e pessoas de menor escolaridade e nível econômico.
Salim, S.; Gould, A.
2000-12-01
Full-Sky Astrometric Mapping Explorer (FAME) belongs to a new generation of astrometry satellites and will probe the surrounding space some 20 times deeper than its predecessor Hipparcos. As a result we will acquire precise knowledge of 5 out of 6 components of phase-space for millions of stars. The remaining coordinate, radial velocity, will remain unknown. In this study, we look at how the knowledge of radial velocity affects the determination of the structure of the Galaxy, and its gravitational potential. We therefore propose a radial velocity survey of FAME stars, and discuss its feasibility and technical requirements.
Visualization of Chinese Library Classification Based on Radial Tree%基于放射树的《中图法》可视化实现
李国俊; 肖明
2012-01-01
利用Java、数据库和hibernate技术实现基于放射树的《中国图书馆分类法》可视化系统。系统提供多种动态交互式功能，并实现两种形态的放射树；利用带复选框的传统树供用户选择，使用户可以只可视化自己感兴趣的子类目；系统为用户使用《中国图书馆分类法》提供了一个新的可视化角度。%Based on radial tree, this paper implements visualizing system of Chinese Library Classification by using java, database and hibernate techniques. This system provides many kinds of dynamic and interactive functions, and implements two frowns of radial tree. Users can only visualize categories according to their interests. This system provides users a new view of visualization to use Chi- nese Library Classification. Finally, the authors point out the future research work.
Radial nerve dysfunction (image)
The radial nerve travels down the arm and supplies movement to the triceps muscle at the back of the upper arm. ... the wrist and hand. The usual causes of nerve dysfunction are direct trauma, prolonged pressure on the ...
Basiulis, A.; Buzzard, R. J.
1971-01-01
Unit moves heat radially from small diameter shell to larger diameter shell, or vice versa, with negligible temperature drop, making device useful wherever heating or cooling of concentrically arranged materials, substances, and structures is desired.
Fernando M. Clara
2006-12-01
Full Text Available Se utilizó la técnica de análisis del registro incruento de las variaciones de diámetro de arteria radial para evaluar el deterioro arterial y el riesgo cardiovascular en pacientes hipertensos. El transductor utilizado consistió en un sensor de movimiento apoyado sobre la zona de palpación del pulso radial. Se efectuó la determinación del índice de aumentación radial, un parámetro que cuantifica la magnitud de las reflexiones de la onda de presión en la región aórtica, sobre un conjunto de 47 hipertensos, y se lo comparó con otro estudio similar efectuado sobre 81 normotensos sanos. Estos últimos presentaron menores valores de dicho índice, pero al avanzar la edad los valores de ambos grupos tendieron a coincidir. Esto fue confirmado al comparar morfológicamente los registros de ambos grupos, hallándose que los registros de ancianos normotensos sanos e hipertensos de edades similares resultaron visiblemente parecidos. Se halló también que determinados hipertensos jóvenes presentaron ciertas características morfológicas similares a las de normotensos de la misma edad, indicando que aún conservaban las características elásticas propias de su grupo etario. Los resultados fueron similares a los logrados sobre registros de presión arterial radial obtenidos mediante tonometría de aplanación, utilizándose una tecnología disponible en nuestro medio y de menor costo.A blood less analysis technique of the diameter variation signal at radial artery was used to evaluate the arterial disease and the cardiovascular risk in hypertensive patients. A movement transducer was used to record the wrist pulse. A radial augmentation index was proposed to quantify the magnitude of the pressure wave reflections in the aortic region. The experiment was carried out with a group of 47 hypertensive men and compared with a similar study performed on 81 normotensive healthy men. The last ones presented smaller values of this index, but as age
Raïssa Mayer Ramalho Catão
2014-09-01
Full Text Available Produtos derivados de plantas estão sendo bastante estudados devido à possibilidade de apresentarem substâncias com atividades antimicrobianas, principalmente, em decorrência do aumento da resistência bacteriana aos antimicrobianos, Vaccinium macrocarpon Aiton, conhecido como cranberry, é uma planta nativa, bastante difundida na América do Norte por suas propriedades terapêuticas, particularmente, na prevenção e tratamento de infecções urinárias, Este estudo objetivou avaliar in vitro a atividade antibacteriana, a concentração inibitória mínima (CIM de um produto comercial a base de cranberry bem como as possíveis interações deste produto quando em associação com antimicrobianos, frente a cepas de Escherichia coli, As avaliações da atividade antibacteriana e da CIM foram realizadas utilizando-se discos de papel filtro estéreis (Cefar®, embebidos em 30µL da solução contendo frutos de cranberry em diferentes concentrações, O estudo da interferência do produto sobre a efetividade dos antimicrobianos foi realizado embebendo-se os discos de antibióticos, com 30µL da solução de cranberry [20mg/mL] equivalente a ½ CIM, Os resultados mostraram que a solução de cranberry apresentou atividade para todas as cepas de E, coli testadas independentemente do perfil de resistência e foi capaz de provocar diferentes efeitos interativos quando associado aos antimicrobianos, Estes dados comprovam o potencial antibacteriano deste fruto, promissor, para estudos de desenvolvimento de novos fármacos, entretanto, também mostram que em algumas situações, pode interferir sobre a efetividade de antimicrobianos de uso clínico.
Daniele Durães Noronha
2016-02-01
Full Text Available Resumo Objetivou-se investigar fatores associados aos Componentes Físico (CF e Mental (CM da Qualidade de Vida Relacionada à Saúde (QVRS entre adultos. Estudo de base populacional, com amostra domiciliar por conglomerados. As variáveis dependentes foram os escores do CF e CM do instrumento 12-Item Short-Form Health Survey (SF-12, as independentes foram reunidas em características sociodemográficas, relativas à saúde e comportamentais. Conduziu-se regressão múltipla pelo Modelo Linear Geral com correção pelo desenho amostral. Dos 841 entrevistados, 31% e 37,2% apresentavam comprometimento no CF e CM, respectivamente, e 57% apresentaram comprometimento em pelo menos um domínio. Os escores médios foram 49,9 para CF e 47,1 para CM. Ser do sexo masculino (β = 1,94, possuir automóvel na família (β = 0,89, ter utilizado serviços odontológicos recentemente (β = 1,86, não possuir doença crônica (β = 4,60, não fazer uso de medicamento (β = 2,09, não ser tabagista (β = 2,04 e praticar atividades físicas (β = 1,73 foram associados a maiores escores do CF, enquanto não fazer uso de medicamento (β = 1,91 e não ser tabagista (β = 1,26 a maiores escores do CM. Há necessidade de mais estudos e políticas voltadas à manutenção e/ou recuperação do bem estar físico e mental de adultos sem doenças específicas.
Estimativa da produtividade de café com base em um modelo agrometeorológico-espectral
Viviane Gomes Cardoso da Rosa
2010-12-01
Full Text Available O objetivo deste trabalho foi avaliar um modelo agrometeorológico-espectral, para estimar a produtividade de cafezais. Utilizaram-se imagens do sensor MODIS e dados agrometeorológicos do modelo regional de previsão do tempo (ETA, para fornecer as variáveis de entrada para o modelo agrometeorológico-espectral da mesorregião geográfica sul/sudoeste do estado de Minas Gerais nos anos-agrícolas de 2003/2004 a 2007/2008. A variável espectral de entrada do modelo agrometeorológico-espectral, índice de área foliar (IAF, usada no cálculo da produtividade máxima, foi estimada com o índice de vegetação por diferença normalizada (NDVI, obtido de imagens MODIS. Outras variáveis de entrada no modelo foram: dados meteorológicos gerados pelo modelo ETA e a capacidade de água disponível no solo. Ao comparar a produtividade média estimada pelo modelo com a fornecida oficialmente pelo IBGE, as diferenças relativas obtidas em escala regional foram de: 0,4, 3,0, 5,3, 1,5 e 8,5% para os anos agrícolas 2003/2004, 2004/2005, 2005/2006, 2006/2007 e 2007/2008, respectivamente. O modelo agrometeorólogico-espectral, que tem como base o modelo de Doorenbos & Kassan, foi tão eficaz para estimar a produtividade dos cafezais quanto o modelo oficial do IBGE. Além disso, foi possível espacializar a quebra de produtividade e prever 80% da produtividade final na primeira quinzena de fevereiro, antes do início da colheita
On the assumption that random interruptions in the observation process are modeled by a sequence of independent Bernoulli random variables, we firstly generalize two kinds of nonlinear filtering methods with random interruption failures in the observation based on the extended Kalman filtering (EKF) and the unscented Kalman filtering (UKF), which were shortened as GEKF and GUKF in this paper, respectively. Then the nonlinear filtering model is established by using the radial basis function neural network (RBFNN) prototypes and the network weights as state equation and the output of RBFNN to present the observation equation. Finally, we take the filtering problem under missing observed data as a special case of nonlinear filtering with random intermittent failures by setting each missing data to be zero without needing to pre-estimate the missing data, and use the GEKF-based RBFNN and the GUKF-based RBFNN to predict the ground radioactivity time series with missing data. Experimental results demonstrate that the prediction results of GUKF-based RBFNN accord well with the real ground radioactivity time series while the prediction results of GEKF-based RBFNN are divergent. (geophysics, astronomy, and astrophysics)
Bartoníček, J; Naňka, O; Tuček, M
2015-10-01
In the clinical practice, radial shaft may be exposed via two approaches, namely the posterolateral Thompson and volar (anterior) Henry approaches. A feared complication of both of them is the injury to the deep branch of the radial nerve. No consensus has been reached, yet, as to which of the two approaches is more beneficial for the proximal half of radius. According to our anatomical studies and clinical experience, Thompson approach is safe only in fractures of the middle and distal thirds of the radial shaft, but highly risky in fractures of its proximal third. Henry approach may be used in any fracture of the radial shaft and provides a safe exposure of the entire lateral and anterior surfaces of the radius.The Henry approach has three phases. In the first phase, incision is made along the line connecting the biceps brachii tendon and the styloid process of radius. Care must be taken not to damage the lateral cutaneous nerve of forearm.In the second phase, fascia is incised and the brachioradialis identified by the typical transition from the muscle belly to tendon and the shape of the tendon. On the lateral side, the brachioradialis lines the space with the radial artery and veins and the superficial branch of the radial nerve running at its bottom. On the medial side, the space is defined by the pronator teres in the proximal part and the flexor carpi radialis in the distal part. The superficial branch of the radial nerve is retracted together with the brachioradialis laterally, and the radial artery medially.In the third phase, the attachment of the pronator teres is identified by its typical tendon in the middle of convexity of the lateral surface of the radial shaft. The proximal half of the radius must be exposed very carefully in order not to damage the deep branch of the radial nerve. Dissection starts at the insertion of the pronator teres and proceeds proximally along its lateral border in interval between this muscle and insertion of the supinator
Numerical Simulation of Modified Radial Electric Field by LHCD
Wei Wei; Ding Bojiang; Kuang Guangli
2005-01-01
Based on the electron's radial force equilibrium, the profiles of radial electric field in OH and LHCD phase are calculated by using a simulation code. The dependences of radial electron field on electron density and its profile and different current ratio, Irf/Ip, are given. The connections between the improvement of plasma confinement and the modified radial electric field by LHCD are discussed by comparing the calculated results with the experimental results.
Coufal, David
-, submitted 2015 (2016). ISSN 0165-0114 R&D Projects: GA MŠk(CZ) LD13002 Institutional support: RVO:67985807 Keywords : fuzzy systems * radial functions * coherence Subject RIV: BB - Applied Statistics, Operational Research Impact factor: 1.986, year: 2014
The on-line estimation of the state of charge (SOC) of the batteries is important for the reliable running of the pure electric vehicle in practice. Because a nonlinear feature exists in the batteries and the radial-basis-function neural network (RBF NN) has good characteristics to solve the nonlinear problem, a practical method for the SOC estimation of batteries based on the RBF NN with a small number of input variables and a simplified structure is proposed. Firstly, in this paper, the model of on-line SOC estimation with the RBF NN is set. Secondly, four important factors for estimating the SOC are confirmed based on the contribution analysis method, which simplifies the input variables of the RBF NN and enhances the real-time performance of estimation. Finally, the pure electric buses with LiFePO4 Li-ion batteries running during the period of the 2010 Shanghai World Expo are considered as the experimental object. The performance of the SOC estimation is validated and evaluated by the battery data from the electric vehicle
Liu, Wei; Chang, Qing-Rui; Guo, Man; Xing, Dong-Xing; Yuan, Yong-Sheng
2011-04-01
The hyperspectral leaf reflectance in winter wheat was measured under 4 phosphorus levels at different growth stages, i.e. revival stage, jointing stage, tassel stage and grouting stage. And their first derivative of spectra were calculated and denoised by the threshold denoising method based on wavelet transform. After studying characteristics of the two kinds of spectra resulting from different phosphorus contents levels as well as correlations between leaf phosphorus contents and spectral values, sensitive wavebands and four kinds of absorption areas were extracted. Then the four kinds of absorption areas and their corresponding leaf phosphorus content were normalized and input to RBFNN. Results show that: (1) Sensitive wavebands for monitoring leaf phosphorus contents in original leaf spectra are 426-435 and 669-680 nm. (2) Sensitive wavebands in first derivative of spectra are 481-493 and 685-696 nm. (3) Trained RBFNN can learn and seize the linearity/non-linearity mapping between samples and output targets. PMID:21714267
Mary Opokua Ansong; Hong-Xing Yao; Jun Steed Huang
2013-01-01
The performance of a proposed compact radial basis function was compared with the sigmoid basis function and the gaussian-radial basis function neural networks in 3D wireless sensor routing topology control, in underground mine rescue operation. Optimised errors among other parameters were examined in addition to scalability and time efficiency. To make the routing path efficient in emergency situations, the sensor sequence and deployment as well as transmission range were carefully considere...
Das, M.; Meikap, B.C.; Saha, R.K. [Indian Institute of Technology, Kharagpur (India). Dept. of Chemical Engineering
2008-12-15
Axial and radial segregation and mixing of single and mixed particle systems were studied for the various sizes and densities in a 10.16cm diameter riser of a circulating fluidized bed (CFB) based on terminal settling velocity of particles. The gas velocities were maintained in the range of 2.01-4.681 m/s and solid circulation rate between 12.5 and 50 kg/m{sup 2}s. Three quartz sand-FCC catalyst mixtures with different initial weight % of sand and two coal-iron ore mixtures were used. The difference in local mean particle sizes of the components of the binary mixture has been observed in the riser of a CFB. Due to the larger mean particle size of sand and due to their lower solid density, the measured particle sizes of this fraction show higher values than FCC. For the same size of bed materials consisting of coal and iron ore mixture the variation of the mean particle size for both has been found to be very narrow. Again the axial segregation for the coal/iron ore mixture has been studied in terms of terminal settling velocity of the particles. The result showed a continuous classification of bed materials along the riser of a CFB.
Radial structures of plasma rotation and radial electric field are experimentally studied in tokamak, heliotron/torsatron and stellarator devices. The perpendicular and parallel viscosities are measured. The parallel viscosity, which is dominant in determining the toroidal velocity in heliotron/torsatron and stellarator devices, is found to be neoclassical. On the other hand, the perpendicular viscosity, which is dominant in dictating the toroidal rotation in tokamaks, is anomalous. Even without external momentum input, both a plasma rotation and a radial electric field exist in tokamaks and heliotrons/torsatrons. The observed profiles of the radial electric field do not agree with the theoretical prediction based on neoclassical transport. This is mainly due to the existence of anomalous perpendicular viscosity. The shear of the radial electric field improves particle and heat transport both in bulk and edge plasma regimes of tokamaks. (author) 95 refs
Kotlínová, M.; Kloiber, Michal
Wien : Bundesministerium fur Land und Forstwirtschaft and BOKU, 2008 - (Grabner, M.). s. 43-43 ISBN N. [EuroDendro 2008. 28.05.2008-31.05.2008, Hallstadt] Grant ostatní: GA ČR(CZ) GA103/07/1091 Institutional research plan: CEZ:AV0Z20710524 Source of funding: V - iné verejné zdroje Keywords : radial core * testing * mechanical properties Subject RIV: JN - Civil Engineering
Esteves, Joana Diniz
2012-01-01
Mestrado em em Gestão de Recursos Humanos A vida dos indivíduos é preenchida por um sem número de papéis. Da necessidade de articulação destes diferentes papéis, surgem actividades pessoais desenvolvidas no trabalho. Este estudo de caso foca-se então nas actividades pessoais desenvolvidas no trabalho, tais como, conversar, telefonar, comer, fumar, entre outras. Os dados foram obtidos através de observação directa não participante a 35 indivíduos de uma empresa Portuguesa, bem como por ques...
GADBMS - um algorítmo genético minerador de dados para base de dados relacionais
Cavalheiro, Andréa de Fátima
2011-01-01
Resumo: O presente trabalho introduz GADBMS, uma ferramenta de Mineração de Dados para a tarefa de classificação que utiliza um algoritmo genético restrito por listas Tabu para efetuar a busca das regras. Algoritmos genéticos têm diversas vantagens, entre elas: poder trabalhar com dados imprecisos, facilidade de ajustar os parâmetros de acordo com o domínio, possibilidade de paralelização e distribuição da carga de processamento. Apesar do exposto, a tarefa de classificação exige a adoção de ...
Radially inhomogeneous bounded plasmas
Zakeri-Khatir, H.; Aghamir, F. M.
2016-07-01
On the basis of kinetic theory along with self-consistent field equations, the expressions for dielectric tensor of radially inhomogeneous magnetized plasma columns are obtained. The study of dielectric tensor characteristics allows the accurate analysis of the inhomogeneous properties, beyond limitations that exist in the conventional method. Through the Bessel–Fourier transformation, the localized form of material equations in a radially inhomogeneous medium are obtained. In order to verify the integrity of the model and reveal the effect of inhomogeneity, a special case of a cylindrical plasma waveguide completely filled with inhomogeneous magnetized cold plasma was considered. The dispersion relation curves for four families of electromagnetic (EH and HE) and electrostatic (SC and C) modes are obtained and compared with the findings of the conventional model. The numerical analysis indicates that the inhomogeneity effect leads to coupling of electromagnetic and electrostatic modes each having different radial eigen numbers. The study also reveals that the electrostatic modes are more sensitive to inhomogeneous effects than the electromagnetic modes.
Perceived radial translation during centrifugation
Bos, J.E.; Correia Grácio, B.J.
2015-01-01
BACKGROUND: Linear acceleration generally gives rise to translation perception. Centripetal acceleration during centrifugation, however, has never been reported giving rise to a radial, inward translation perception. OBJECTIVE: To study whether centrifugation can induce a radial translation percepti
Iliana Yaschine
2013-01-01
One Pager No. 176 ? Replicando um Programa de Transferência Condicionada de Renda: Reflexões com Base na Experiência do Programa Oportunidades por Iliana Yaschine, Universidade Nacional Autônoma do México (UNAM) Durante a primeira década do Século 21, com o apoio de uma série de organizações internacionais, os Programas de Transferência Condicionada de Renda (PTCs) tornaram-se alguns dos instrumentos de política social mais amplamente utilizados no combate à pobreza na América Latina, África ...
Juvenal Soares Dias da Costa
2006-06-01
Full Text Available OBJETIVO: Comparar a prevalência de Diabetes Mellitus em população adulta, residente em área urbana, segundo auto-referência e valores de exame de glicemia de jejum. MÉTODOS: Realizou-se um estudo transversal de base populacional, com 1.968 pessoas de 20 a 69 anos, residentes na zona urbana da cidade de Pelotas, Estado do Rio Grande do Sul, em 2000. Estimou-se uma amostra de 1.800 indivíduos. Realizaram-se visitas domiciliares em 40 setores censitários sorteados aleatoriamente. Foi aplicado um questionário padronizado a todos participantes da pesquisa, incluindo perguntas sobre a presença de "açúcar no sangue", e quando afirmativo, se algum médico havia confirmado a doença. Uma subamostra de 367 participantes foi sorteada para realização de exames, entre os quais glicemia de jejum. Adotou-se como ponto de corte da glicemia de jejum para reconhecimento de diabetes 126 mg/dl e 140 mg/dl. Os resultados foram apresentados na forma de freqüência e respectivos intervalos de confiança de 95%. RESULTADOS: Dos entrevistados, 110 (5,6%; IC 95%: 4,6-6,6 referiram a presença de Diabetes Mellitus com diagnóstico confirmado pelo médico. Para as 367 pessoas submetidas aos exames laboratoriais, a prevalência de diabetes auto-referido e confirmada por médico foi de 7,1% (IC 95%: 4,5-9,7. CONCLUSÕES: As estimativas de prevalência encontradas são compatíveis com as obtidas em outras investigações nacionais. Os estudos epidemiológicos de base populacional são raros no Brasil e podem contribuir para o planejamento em saúde.OBJECTIVE: To compare the prevalence of Diabetes Mellitus among the adult population of an urban area, according to self-reported diabetes and fasting glucose test results. METHODS: We carried out a population-based cross-sectional study of 1,968 subjects aged 20-69 years, living in the urban area of the city of Pelotas, Southern Brazil, in the year 2000. Sample size was calculated at 1,800 subjects. We visited the
Dameron, R.A.; Rashid, Y.R. [ANATECH Corp., San Diego, CA (United States); Luk, V.K.; Hessheimer, M.F. [Sandia National Labs., Albuquerque, NM (United States)
1998-04-01
Construction of a prestressed concrete containment vessel (PCCV) model is underway as part of a cooperative containment research program at Sandia National Laboratories. The work is co-sponsored by the Nuclear Power Engineering Corporation (NUPEC) of Japan and US Nuclear Regulatory Commission (NRC). Preliminary analyses of the Sandia 1:4 Scale PCCV Model have determined axisymmetric global behavior and have estimated the potential for failure in several areas, including the wall-base juncture and near penetrations. Though the liner tearing failure mode has been emphasized, the assumption of a liner tearing failure mode is largely based on experience with reinforced concrete containments. For the PCCV, the potential for shear failure at or near the liner tearing pressure may be considerable and requires detailed investigation. This paper examines the behavior of the PCCV in the region most susceptible to a radial shear failure, the wall-basemat juncture region. Prediction of shear failure in concrete structures is a difficult goal, both experimentally and analytically. As a structure begins to deform under an applied system of forces that produce shear, other deformation modes such as bending and tension/compression begin to influence the response. Analytically, difficulties lie in characterizing the decrease in shear stiffness and shear stress and in predicting the associated transfer of stress to reinforcement as cracks become wider and more extensive. This paper examines existing methods for representing concrete shear response and existing criteria for predicting shear failure, and it discusses application of these methods and criteria to the study of the 1:4 scale PCCV.
Construction of a prestressed concrete containment vessel (PCCV) model is underway as part of a cooperative containment research program at Sandia National Laboratories. The work is co-sponsored by the Nuclear Power Engineering Corporation (NUPEC) of Japan and US Nuclear Regulatory Commission (NRC). Preliminary analyses of the Sandia 1:4 Scale PCCV Model have determined axisymmetric global behavior and have estimated the potential for failure in several areas, including the wall-base juncture and near penetrations. Though the liner tearing failure mode has been emphasized, the assumption of a liner tearing failure mode is largely based on experience with reinforced concrete containments. For the PCCV, the potential for shear failure at or near the liner tearing pressure may be considerable and requires detailed investigation. This paper examines the behavior of the PCCV in the region most susceptible to a radial shear failure, the wall-basemat juncture region. Prediction of shear failure in concrete structures is a difficult goal, both experimentally and analytically. As a structure begins to deform under an applied system of forces that produce shear, other deformation modes such as bending and tension/compression begin to influence the response. Analytically, difficulties lie in characterizing the decrease in shear stiffness and shear stress and in predicting the associated transfer of stress to reinforcement as cracks become wider and more extensive. This paper examines existing methods for representing concrete shear response and existing criteria for predicting shear failure, and it discusses application of these methods and criteria to the study of the 1:4 scale PCCV
Teplitzky, Benjamin A; Zitella, Laura M; Xiao, YiZi; Johnson, Matthew D
2016-01-01
Deep brain stimulation (DBS) leads with radially distributed electrodes have potential to improve clinical outcomes through more selective targeting of pathways and networks within the brain. However, increasing the number of electrodes on clinical DBS leads by replacing conventional cylindrical shell electrodes with radially distributed electrodes raises practical design and stimulation programming challenges. We used computational modeling to investigate: (1) how the number of radial electrodes impact the ability to steer, shift, and sculpt a region of neural activation (RoA), and (2) which RoA features are best used in combination with machine learning classifiers to predict programming settings to target a particular area near the lead. Stimulation configurations were modeled using 27 lead designs with one to nine radially distributed electrodes. The computational modeling framework consisted of a three-dimensional finite element tissue conductance model in combination with a multi-compartment biophysical axon model. For each lead design, two-dimensional threshold-dependent RoAs were calculated from the computational modeling results. The models showed more radial electrodes enabled finer resolution RoA steering; however, stimulation amplitude, and therefore spatial extent of the RoA, was limited by charge injection and charge storage capacity constraints due to the small electrode surface area for leads with more than four radially distributed electrodes. RoA shifting resolution was improved by the addition of radial electrodes when using uniform multi-cathode stimulation, but non-uniform multi-cathode stimulation produced equivalent or better resolution shifting without increasing the number of radial electrodes. Robust machine learning classification of 15 monopolar stimulation configurations was achieved using as few as three geometric features describing a RoA. The results of this study indicate that, for a clinical-scale DBS lead, more than four radial
Radial multiresolution in dimension three.
H. Rauhut; M.M. Rösler
2005-01-01
Abstract We present a construction of a wavelet-type orthonormal basis for the space of radial $L^2$-functions in {\\bf R}$^3$ via the concept of a radial multiresolution analysis. The elements of the basis are obtained from a single radial wavelet by usual dilations and generalized translations. Her
Antonio Fernando Crepaldi
2012-12-01
Full Text Available Nos últimos anos houve uma contribuição significativa dos físicos para a construção de um tipo de modelo baseado em agentes que busca reproduzir, em simulação computacional, o comportamento do mercado financeiro. Esse modelo, chamado Jogo da Minoria consiste de um grupo de agentes que vão ao mercado comprar ou vender ativos. Eles tomam decisões com base em estratégias e, por meio delas, os agentes estabelecem um intrincado jogo de competição e coordenação pela distribuição da riqueza. O modelo tem demonstrado resultados bastante ricos e surpreendentes, tanto na dinâmica do sistema como na capacidade de reproduzir características estatísticas e comportamentais do mercado financeiro. Neste artigo, são apresentadas a estrutura e a dinâmica do Jogo da Minoria, bem como as contribuições recentes relacionadas ao Jogo da Minoria denominado de Grande Canônico, que é um modelo mais bem ajustado às características do mercado financeiro e reproduz as regularidades estatísticas do preço dos ativos chamadas fatos estilizados.Over the past ten years physicists have made a significant contribution to the building of an agent-based model to reproduce the behavior of financial markets using computer simulation. This model, called the Minority Game, consists of a group of agents that buy or sell assets. They make decisions based on strategies, and through them the agents establish an intricate game of competition and coordination resulting in the distribution of wealth. The model has shown outstanding surprising results concerning both the dynamics of the system and the ability to reproduce statistical and behavior characteristics of the financial market. In this study, the structure and dynamics of the Minority Game and the recent contributions related to the Grand Canonical Minority game, a model which is better adapted to the characteristics of the financial market and reproduce the statistical regularities of asset prices (called
张云鹏; 刘淑琴; 李红伟; 范友鹏
2012-01-01
研究轴向混合磁轴承实现五自由度悬浮时，需要计算径向承载力与磁轴承结构参数以及永磁体参数之间的关系。为了解决轴向混合磁轴承缺乏径向承载力解析数学模型的问题，该文在分析轴向混合磁轴承磁路以及各部分磁导的基础上，结合稀土永磁体的工作特性，用虚位移法得出了轴向混合磁轴承的径向承载力解析数学模型。模型表明，在小径向位移时，该型的混合磁轴承径向承载力随着径向位移增加而增加，近似线性关系，径向承载力和刚度随轴向气隙增大而减小；磁轴承径向承载力随永磁体的有效长度增加呈现先增大后趋近饱和。利用有限元方法对径向承载力进行仿真计算，仿真结果与模型计算结果基本吻合。%In studying axial hybrid magnetic bearing （HMB） for suspension in five degree of freedom （DOF）, the relationship between radial electromagnetic force and magnetic bearing structural parameters and permanent magnet parameters should be calculated. In order to overcome the lack of analytical calculation model for radial electromagnet force of axial HMB, based on magnetic circuit analysis and calculation of magnetic conductance for each parts, the analytical calculation model for radial electromagnet force of axial HMB is proposed in this paper. The analytical formulation of radial electromagnetic force is derived by using virtual displacement method and demagnetization characteristics of the rare earth permanent magnet. It is found that the radial electromagnetic force increases with the radial displacement increasing approximately in linear relationship, and the radial force and stiffness decreases with the axial gap increasing. The radial electromagnetic force increased and then saturated with increasing permanent magnet effective length. The model of axial HMB is simulated by finite-element method software and the simulation results are basically in
Radial Rydberg wavepacket maps
Zeibel, J. G.; Jones, R. R.
2001-04-01
Picosecond laser pulses have been used to excite radial Rydberg wavepackets in Ca. Time-delayed, unipolar, `half-cycle' electric field pulses are used to probe the evolution of the wavepackets as a continuous function of binding energy. The data provide three-dimensional maps of wavepacket recurrence probability versus binding energy versus time. A rescaling of the energy and time coordinate axes allows the visualization of the distinct difference between the initial oscillations of the wavepacket and those that occur at integer and fractional revivals.
Radial cylinder aircraft engines
Šimíček, Petr
2015-01-01
Práce je zaměřena na konstrukční řešení letadlových hvězdicových motorů. Úvod je pojednáním o historii letadlových hvězdicových motorů a jejich vývoji v historickém kontextu. Druhá část je zaměřena na konstrukci letadlových hvězdicových motorů, následně jsou uvedena některá zajímavá konstrukční řešení a porovnání s motorem jiného druhu konstrukce. The bachelor's thesis is focused on design of aircraft radial engines. Home is a treatise on the history of aircraft radial engines and their de...
Mônica Maria De Marchi
2001-08-01
Full Text Available Apresenta-se um modelo de manutenção para um equipamento que se deteriora com o tempo. O equipamento produz periodicamente um lote de peças. Cada lote produzido é inspecionado e, em função do número de peças defeituosas encontradas, deve-se decidir sobre deixar o equipamento operando ou revisá-lo. O objetivo é obter uma política de manutenção que minimize o custo médio a longo prazo de operação e revisão do equipamento. A estrutura de custos inclui um custo de operação, um custo de revisão e um custo por peça defeituosa produzida. Para obter uma política de manutenção de custo mínimo, o problema é modelado como um Processo Markoviano de Decisão com Informação Parcial. Exemplos numéricos são apresentados.In this paper a maintenance model is presented for an equipment deteriorating in with time. The equipment periodically produces a batch of parts. Each batch is inspected and, based on the number of defective parts, a decision about the revision of the equipment is made. The goal of the model is to obtain a maintenance policy for the equipment that minimizes the long run average cost. The cost structure includes an operation cost, a revision cost and a defective part cost. To obtain a minimum cost policy, the problem is modeled as a Markov Decision Process with Partial Information. Numerical examples are presented.
Carlsen, Rasmus K; Peters, Christian D; Khatir, Dinah S;
2016-01-01
/min/1.73 m(2)) and 41 controls without renal disease undergoing scheduled coronary angiography. BP in the ascending aorta was measured through the angiography catheter and simultaneously estimated using radial tonometry. The mean difference between estimated central and aortic SBP was -13.2 (95...
Barragan M, A.M.; Martin del Campo M, C.; Palomera P, M.A. [FI-UNAM, Circuito Exterior, Ciudad Universitaria, 04510 Mexico D.F. (Mexico)]. E-mail: ale_bar_m@yahoo.com.mx
2005-07-01
A methodology based on Fuzzy Logic for the construction of the objective function of the optimization problems of nuclear fuel is described. It was created an inference system that responds, in certain form, as a human expert when it has the task of qualifying different radial designs of fuel cells. Specifically it is detailed how an inference system based based on Fuzzy Logic that has five enter variables and one exit variable was built, which corresponds to the objective function for the radial design of a fuel cell for a BWR. The use of Fuzzy with Mat lab offered the visualization capacity of the exit variable in function of one or two enter variables at the same time. This allowed to build, in appropriate way, the combination of the inference rules and the membership functions of those diffuse sets used for each one of the enter variables. The obtained objective function was used in an optimization process based on Taboo search. The new methodology was proven for the design of a cell used in a fuel assemble of the Laguna Verde reactor obtaining excellent results. (Author)
1983-01-01
There were 37 (normal) + 3 (special) Radial Field magnets in the ISR to adjust vertically the closed orbit. Gap heights and strengths were 200 mm and .12 Tm in the normal magnets, 220 mm and .18 Tm in the special ones. The core length was 430 mm in both types. Due to their small length as compared to the gap heights the end fringe field errors were very important and had to be compensated by suitably shaping the poles. In order to save on cables, as these magnets were located very far from their power supplies, the coils of the normal type magnets were formed by many turns of solid cpper conductor with some interleaved layers of hollow conductor directly cooled by circulating water
Radial Matrix Elements of Hydrogen Atom and the Correspondence Principle
T. N. Chakrabarty
2004-03-01
Radial dipole matrix elements having astrophysical importance have been computed for highly excited states of hydrogen atom. Computation is based on Heisenberg’s form of correspondence principle for Coulomb potential. Particular attention has been paid to the choice of classical analogue (c) of principal quantum number (). The computed radial matrix elements are in good agreement with quantum mechanical results. Further, radial matrix elements for few transitions involving high neighboring states of hydrogen atom are presented.
Luiz Ernani Meira Jr.
2011-12-01
Full Text Available Os aneurismas da artéria radial são extremamente raros. Em sua maioria, consistem de pseudoaneurismas pós-traumáticos. Os aneurismas da artéria radial verdadeiros podem ser idiopáticos, congênitos, pós-estenóticos ou associados a patologias, tais como vasculites e doenças do tecido conjuntivo. Foi relatado um caso de aneurisma idiopático de artéria radial em uma criança de três anos, que, após completa investigação diagnóstica complementar, foi submetida à ressecção cirúrgica.Radial artery aneurysms are extremely rare. Post-traumatic pseudoaneurysms are the vast majority. True radial artery aneurysms can be idiopathic, congenital, poststenotic, or associated with some pathologies, such as vasculitis and conjunctive tissue diseases. We report a case of an idiopathic aneurysm of the radial artery in a three-year-old child who was submitted to surgical resection after a complete diagnostic approach.
Chen, M.; Niu, F.; Liu, Q.; Tromp, J.
2015-12-01
EARA2014 -a 3-D radially anisotropic model of the crust and mantle beneath East Asia down to 900 km depth- is developed by adjoint tomography based on a spectral element method. The data set used for the inversion comprises 1.7 million frequency-dependent traveltime measurements from waveforms of 227 earthquakes recorded by 1869 stations. After 20 iterations, the new model (named EARA2014) exhibits sharp and detailed wave speed anomalies with improved correlations with surface tectonic units compared to previous models. As part of tectonic interpretations of EARA2014, we investigated the seismic wavespeed anomalies beneath two prominent uplifted regions in East Asia: (1) Hangai Dome, an intra-continental low-relief surface with more than 2 km elevation in central Mongolia, and (2) Tibetan Plateau, a vast continental-margin surface with an average elevation of 4.5 km in west China. We discover beneath Hangai Dome a deep low shear wavespeed (low-V) conduit indicating a slightly warmer (54 K-127 K) upwelling from the transition zone. We propose that the mantle upwelling induced decompression melting in the uppermost mantle and that excess heat associated with melt transport modified the lithosphere that isostatically compensates the surface uplift of Hangai Dome at upper mantle depths (> 80 km). On the other hand, we observe no discernable focused deep mantle upwelling directly beneath Tibetan Plateau, which is instead dominated by a strong high-V structure, appearing below 100 km depth and extending to the bottom of the mantle transition zone. However, we find a very strong and localized low-V anomaly beneath the Tibetan Plateau in the crust and uppermost mantle (at depths of ~50 km and 100 km) mainly confined within the Songpan Ganzi Fold Belt and the northern Qiangtang Block. This low-V anomaly is spatially linked to a low-V anomaly beneath the Chuandian Block in the same depth range, which is fed by a deep mantle upwelling directly beneath Hainan Volcano in south
Antiproton compression and radial measurements
Andresen, G B; Bowe, P D; Bray, C C; Butler, E; Cesar, C L; Chapman, S; Charlton, M; Fajans, J; Fujiwara, M C; Funakoshi, R; Gill, D R; Hangst, J S; Hardy, W N; Hayano, R S; Hayden, M E; Humphries, A J; Hydomako, R; Jenkins, M J; Jorgensen, L V; Kurchaninov, L; Lambo, R; Madsen, N; Nolan, P; Olchanski, K; Olin, A; Page R D; Povilus, A; Pusa, P; Robicheaux, F; Sarid, E; Seif El Nasr, S; Silveira, D M; Storey, J W; Thompson, R I; Van der Werf, D P; Wurtele, J S; Yamazaki, Y
2008-01-01
Control of the radial proﬁle of trapped antiproton clouds is critical to trapping antihydrogen. We report detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, achieved by manipulating spatially overlapped electron plasmas. We show detailed measurements of the near-axis antiproton radial proﬁle, and its relation to that of the electron plasma. We also measure the outer radial proﬁle by ejecting antiprotons to the trap wall using an octupole magnet.
On magnetopause inflation under radial IMF
Suvorova, A. V.; Dmitriev, A. V.
2016-07-01
Full understanding of the magnetosphere interaction with radial IMF structures embedded in the solar wind flow is far from completeness. In order to analyze the effects of radial IMF, we use THEMIS observations of the magnetopause and magnetosheath together with upstream data acquired from ACE and Wind monitors as well as from the OMNI data base. We demonstrate a prominent magnetopause inflation and low pressure magnetosheath (LPM) mode under long-lasting radial IMF. We propose that these phenomena result from a kinetic effect of energetic ions taking the energy away from the pressure balance at the magnetopause. We show that strict quantitative determination of the inflation and LPM mode as a function of the cone angle is difficult because of the problems with reliable determination of the upstream and magnetosheath conditions. The shortcomings are caused by such effects as ambiguous time delay for the solar wind propagation, THEMIS orbital bias and model-dependent estimations of the magnetopause inflation.
Dynamic programming using radial basis functions
Junge, Oliver; Schreiber, Alex
2014-01-01
We propose a discretization of the optimality principle in dynamic programming based on radial basis functions and Shepard's moving least squares approximation method. We prove convergence of the approximate optimal value function to the true one and present several numerical experiments.
Mortalidade de crianças com doença falciforme: um estudo de base populacional
Ana Paula Pinheiro Chagas Fernandes
2010-08-01
Full Text Available OBJETIVO: Caracterizar os óbitos das crianças com doença falciforme (DF triadas no estado de Minas Gerais e acompanhadas na Fundação Hemominas. MÉTODOS: Coorte de crianças diagnosticadas pelo Programa de Triagem Neonatal de Minas Gerais (março/1998 - fevereiro/2005. Os óbitos foram identificados pela busca ativa das crianças ausentes nas consultas agendadas nos hemocentros. Dados clínicos e epidemiológicos foram coletados dos documentos de óbito, banco de dados da triagem neonatal, prontuários médicos e em entrevistas com as famílias. RESULTADOS: Foram triadas 1.833.030 crianças no período, sendo 1.396 com DF (1:1.300. Ocorreram 78 óbitos: 63 em crianças com genótipo SS, 12 em crianças com genótipo SC e três em crianças com genótipo S/β+ talassemia. Cinquenta e seis crianças (71,8% morreram antes dos 2 anos de idade; 59 morreram em hospitais e 18 no domicílio ou trânsito. Causas de óbito pelo atestado (n = 78: 38,5% infecção; 16,6% sequestro esplênico agudo; 9% outras causas; 15,4% sem assistência médica; e 20,5% indeterminada. Segundo as entrevistas (n = 52, o sequestro esplênico foi responsável por quase 1/3 dos óbitos, contrastando com a porcentagem de apenas 14% registrada nos atestados de óbito. As probabilidades de sobrevida aos 5 anos (erro padrão da média para crianças SS, SC e Sβ+ talassemia foram: 89,4 (1,4, 97,7 (0,7 e 94,7% (3,0, respectivamente (SS versus SC, p < 0,0001. CONCLUSÕES: Mesmo em um programa de triagem neonatal com rigoroso controle do tratamento, a probabilidade de óbito em crianças com genótipo SS ainda é elevada. Os óbitos com causa indeterminada indicam dificuldades no reconhecimento da DF e das suas complicações. Esforços educativos dirigidos a profissionais da saúde e familiares devem ser incrementados para diminuir a mortalidade pela DF.
Radially truncated galactic discs
De Grijs, R; Wesson, K H; Grijs, Richard de; Kregel, Michiel; Wesson, Karen H.
2000-01-01
We present the first results of a systematic analysis of radially truncatedexponential discs for four galaxies of a sample of disc-dominated edge-onspiral galaxies. Edge-on galaxies are very useful for the study of truncatedgalactic discs, since we can follow their light distributions out to largerradii than in less highly inclined galaxies. The origin of these truncationsand their asymmetry and sharpness are helpful to better constrain theories ofgalaxy formation. In general, the discs of our sample galaxies are truncated at similar radiion either side of their centres. With the exception of the disc of ESO 416-G25,it appears that our sample galaxies are closely symmetric, in terms of both thesharpness of their disc truncations and the truncation length. However, thetruncations occur over a larger region and not as abruptly as found by van derKruit & Searle (KS1-4). We show that the truncated luminosity distributions of our sample galaxies,if also present in the mass distributions, comfortably meet the r...
Coelho, T.S.; Yoriyaz, H. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Fernandes, M.A.R. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Servico de Radioterapia; Louzada, M.J.Q. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Aracatuba, SP (Brazil). Curso de Medicina Veterinaria
2010-07-01
Although they are no longer manufactured, the applicators of {sup 90}Sr +{sup 90}Y acquired in the decades of 1990 are still in use, by having half-life of 28.5 years. These applicators have calibration certificate given by their manufacturers, where few have been recalibrated. Thus it becomes necessary to accomplish thorough dosimetry of these applicators. This paper presents a dosimetric analysis distribution radial dose profiles for emitted by an {sup 90}Sr+{sup 90}Y beta therapy applicator, using the MCNP-4C code to simulate the distribution radial dose profiles and radiochromium films to get them experimentally . The results with the simulated values were compared with the results of experimental measurements, where both curves show similar behavior, which may validate the use of MCNP-4C and radiochromium films for this type of dosimetry. (author)
Coelho, Talita S.; Yoriyaz, Helio [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Fernandes, Marco A.R., E-mail: tasallesc@gmail.co [UNESP, Botucatu, SP (Brazil). Faculdade de Medicina. Servico de Radioterapia; Louzada, Mario J.Q. [UNESP, Aracatuba, SP (Brazil). Curso de Medicina Veterinaria
2011-07-01
Although they are no longer manufactured, the applicators of {sup 90}Sr + {sup 90}Y acquired in the decades of 1990 are still in use, by having half-life of 28.5 years. These applicators have calibration certificate given by their manufacturers, where few have been re calibrated. Thus it becomes necessary to accomplish thorough dosimetry of these applicators. This paper presents a dosimetric analysis distribution radial dose profiles for emitted by an {sup 90}Sr + {sup 90}Y beta therapy applicator, using the MCNP-4C code to simulate the distribution radial dose profiles and radio chromium films to get them experimentally . The results with the simulated values were compared with the results of experimental measurements, where both curves show similar behavior, which may validate the use of MCNP-4C and radio chromium films for this type of dosimetry. (author)
Radial systems of dark globules
The author gives examples of radial systems consisting of dark globules and ''elephant trunks''. Besides already known systems, which contain hot stars at their center, data are given on three radial systems of a new kind, at the center of which there are stars of spectral types later than B. Data are given on 32 globules of radial systems of the association Cep OB2. On the basis of the observational data, it is concluded that at least some of the isolated Bok globules derive from elephant trunks and dark globules forming radial systems around hot stars. It is also suggested that the two molecular clouds situated near the Rosette nebula and possessing velocities differing by ca 20 km/sec from the velocity of the nebula could have been ejected in opposite directions from the center of the nebula. One of these clouds consists of dark globules forming the radial system of the Rosette nebula
Tostes, Marcelo Mallat
1999-03-15
This thesis aims the establishment of conceptual bases for the development of Environmental Liability Management System - instruments designed to provide financial and managerial coverage to financial liabilities arising from activities that impact the environment. The document analyses the theories that link the evolution of economic thought and environment, as a means of establish the necessary framework for the development of up-to-date environmental policy instruments. From these concepts and from the analysis of environmental liability system being implemented in several countries, the bases for environmental liability systems development are drawn. Finally, a study is carried out on the application of these bases for the development of an environmental liability management system for a radioactive waste repository. (author)
Leonardo Rafaeli
2007-01-01
Full Text Available Este trabalho apresenta o desenvolvimento e implantação de uma nova metodologia de avaliação de desempenho aplicado a uma empresa do ramo automotivo. Partindo da revisão de conceitos desenvolvidos em modelos como: EVA, TOC, TQM, BSC e CI, segue uma avaliação do sistema original de avaliação de desempenho utilizado, bem como da sua estratégia organizacional, objetivando estabelecer um conjunto pertinente de indicadores. Adicionalmente, este trabalho apresenta um modo de análise conjunta desses indicadores, a partir do AHP, convertendo os resultados em saídas gráficas de imediata compreensão, que possam alertar instantaneamente os responsáveis acerca de eventos fora do esperado. Os benefícios da implantação do método proposto são apresentados, resultando na viabilização do gerenciamento visual do conjunto final de indicadores a partir da inserção dos dados no sistema.This paper presents the development of a new performance system to be applied in an automotive company. Following a literature review on performance systems such as EVA, TOC, TQM, BSC and IC, the original performance system and the company's strategy are discussed, allowing for a more convenient set of indicators to be established and controlled. In addition, this paper presents the development of a method suitable for group analysis on controllable items, based on AHP, providing graphical outputs that can be easily understood and enabling decision makers to be instantly aware of unexpected events. The main benefit of implementing the proposed method is shown. More specifically, we demonstrate that the performance system's management can be performed almost instantly by visual inspection as soon as data is inputted into the system.
Cleonir Tumelero
2011-03-01
Full Text Available O uso intensivo de conhecimento científico e tecnológico em empresas de base tecnológica (EBTs é uma condição essencial para que essas empresas sejam competitivas e possam materializar tal conhecimento por meio de inovações tecnológicas oferecidas ao mercado. Geralmente relacionadas ao conceito de empreendedorismo, as EBTs desempenham uma importante função no desenvolvimento sócio econômico das regiões onde atuam e, para tanto, ao serem empreendidas podem usufruir do apoio de habitats de inovação, como é o caso das incubadoras. As incubadoras são possíveis indutoras da formação de redes de conhecimento capazes de suportar as relações dos empreendimentos incubados com os diversos públicos de interesse, uma vez que dispõe da estrutura e recursos necessários. Ao fomentar a consolidação de tais redes, as incubadoras passam a estimular a convergência do conhecimento por meio de fatores endógenos e exógenos ao ambiente de incubação e, dessa forma, as EBTs podem usufruir dessas relações. Nesse entendimento, o presente estudo busca contribuir para a compreensão da convergência do conhecimento em EBTs e propõe um modelo conceitual integrativo a partir de um ensaio teórico à luz do estado da arte relacionado ao tema.
Metere, Alfredo; Dzugutov, Mikhail
2015-01-01
We present a new program able to perform unique visual analysis on generic particle systems: PASYVAT (PArticle SYstem Visual Analysis Tool). More specifically, it can perform a selection of multiple interparticle distance ranges from a radial distribution function (RDF) plot and display them in 3D as bonds. This software can be used with any data set representing a system of particles in 3D. In this manuscript the reader will find a description of the program and its internal structure, with emphasis on its applicability in the study of certain particle configurations, obtained from classical molecular dynamics simulation in condensed matter physics.
Ronald Nieweglowski
2010-01-01
Full Text Available O conjunto de competências organizacionais que uma empresa emprega na realização de suas operações, potencialmente define sua capacidade de realizar uma determinada estratégia de negócios. O presente artigo se propõe a desenvolver um processo para a análise de projetos de investimento baseado em competências. O estudo se desenrola no âmbito das pequenas empresas e se aplica a projetos de expansão da capacidade. A abordagem desenvolvida fundamenta-se na construção de um framework teórico-conceitual, sendo este refinado por um conjunto de entrevistas realizadas com especialistas. Participam das entrevistas três analistas pleno de investimento e três acadêmicos das áreas de gestão estratégica de operações e gestão econômica da produção. O processo desenvolvido é testado em casos de simulação que se utilizam de dados obtidos de três projetos de investimento analisados por um banco de desenvolvimento, no período de março de 2002 a setembro de 2003. Os casos se distribuem entre os setores de manufatura, comércio de serviços. O resultado do trabalho é um processo de análise de investimentos que usa o conceito de competências empresariais para avaliar a capacidade de uma empresa em gerar resultados. O processo desenvolvido vincula recursos e competências à estratégia empresarial adotada, avaliando as condições necessárias para o desenvolvimento da estratégia. O estudo é de natureza exploratória e, portanto, não permite generalizações. Há necessidade de se ampliar o número de simulações e testar o uso do processo com diferentes analistas de investimento. A principal implicação prática do trabalho reside no fato de se propor um procedimento estruturado para a análise de projetos de investimento para pequenas empresas, dadas as dificuldades de se obter informações econômico-financeiras destas empresas. A pesquisa realizada contribui para o desenvolvimento de metodologias para análise de projetos
Optical implementations of radial basis classifiers
Neifeld, Mark A.; Psaltis, Demetri
1993-01-01
We describe two optical systems based on the radial basis function approach to pattern classification. An optical-disk-based system for handwritten character recognition is demonstrated. The optical system computes the Euclidean distance between an unknown input and 650 stored patterns at a demonstrated rate of 26,000 pattern comparisons/s. The ultimate performance of this system is limited by optical-disk resolution to 10^11 binary operations/s. An adaptive system is also presented that faci...
马明明; 陈浩; 何晓; 王秀明
2013-01-01
本文针对地层横波慢度径向分层模型,分析了地层横波慢度的径向非均匀性对弯曲波频散的影响.基于径向非均匀与均匀模型之间弯曲波频散的差异,结合微扰法和Backus-Gilbert (BG)理论建立了反演横波慢度径向分布的方程,求取了地层横波慢度的径向分布.在无噪声和参数误差时,反演结果较好地反映了实际地层横波慢度的径向分布,当井孔流体或井外地层纵波慢度的选取误差在10％内变化时,反演结果基本保持不变；存在信噪比(SNR)为20 dB(信号的功率为噪声的100倍)或10 dB(信号的功率为噪声的10倍)噪声时,反演结果没有发生明显的改变,其相对误差基本控制在10％以内,可见噪声对反演结果的影响不大.以上反演结果说明,本文采用的结合微扰法和BG理论的反演方法来估测地层横波慢度的径向分布时,具有很好的鲁棒性,可以被用于现场了解井壁周围的地层性质.%Abstract The effect of shear wave slowness's radial heterogeneities on dipole flexural mode dispersions is analyzed for shear wave slowness's radially layered model.Perturbation method and Backus-Gilbert(BG) theory are used for the inversion of shear wave slowness radial variations based on the difference of flexural wave dispersions between radially heterogeneous and homogeneous formations.When there is no noise and error of other parameters,the radial variations of the inverted shear wave slowness agree very well with the assumed radial profile.When the choice of slowness for the borehole fluid or formation compressional wave has a deviation from the true value within 10 percent,the inverted radial variations of shear wave slowness almost remains unchanged.When there exists noise with SNR (Signal Noise Ratio) of 20 dB or 10 dB,the relative error of the inversion results is within 10 percent,which means the impact of noise on the inversion results is little.From the inversion results described
Wei Wang
2016-04-01
Full Text Available Industry is a major contributor to carbon emissions in China, and industrial land is an important input to industrial production. Therefore, a detailed analysis of the carbon emission performance of industrial land use is necessary for making reasonable carbon reduction policies that promote the sustainable use of industrial land. This paper aims to analyze the dynamic changes in the total-factor carbon emission performance of industrial land use (TCPIL in China by applying a global directional distance function (DDF and non-radial Luenberger productivity index. The empirical results show that the eastern region enjoys better TCPIL than the central and western regions, but the regional gaps in TCPIL are narrowing. The growth in NLCPILs (non-radial Luenberger carbon emission performance of industrial land use in the eastern and central regions is mainly driven by technological progress, whereas efficiency improvements contribute more to the growth of NLCPIL in the western region. The provinces in the eastern region have the most innovative and environmentally-friendly production technologies. The results of the analysis of the influencing factors show implications for improving the NLCPIL, including more investment in industrial research and development (R&D, the implementation of carbon emission reduction policies, reduction in the use of fossil energy, especially coal, in the process of industrial production, actively learning about foreign advanced technology, properly solving the problem of surplus labor in industry and the expansion of industrial development.
Estimation of State of Charge of Lead Acid Battery using Radial Basis Function
Sauradip, M; Sinha, SK; K Muthukumar
2001-01-01
A Radial Basis Function based learning system method has been proposed for estimation of State of Charge (SOC) of Lead Acid Battery. Coulomb metric method is used for SOC estimation with correction factor computed by Radial Basis Function Method. Radial basis function based technique is used for learning battery performance variation with time and other parameters. Experimental results are included.
Desenvolvimento de um dispositivo para obtenção de monocristais de ligas à base de cobre
Blanco Matildes
2003-01-01
Full Text Available This paper describes the drawing, construction and optimization of a device, which can be used to obtain single crystals of different metallic materials with melting point from 550 to 1050 ºC. Components of ease obtaining and of low cost were used. The device was based on the modified Bridgman technique and it was used to obtain single crystals of copper-based alloys. The temperature axial profiles and a difference less then 1% in the temperature between the wall and the center of the ceramic tube in the critical region for obtaining single crystals of good quality indicated that the oven presents a good thermal stability. Single crystals of CuZnAl and CuAlAg alloys of good quality were growth and characterized using optical microscopy and Laüe X-ray back reflection.
The positive radial momentum operator
Mosley, Shaun N.
2003-01-01
The Laplacian in spherical coordinates contains the squared radial momentum operator $ p_r^2 = - r^{-1} \\partial_r^2 r $ which is Hermitian and positive. However as has been pointed out by various authors the ``radial momentum operator" $ - i r^{-1} \\partial_r r $ is not Hermitian. The positive square root operator of $ p_r^2 $ is found and also its inverse. We discuss the relation of these operators with Fourier transforms, the Hilbert transform and fractional integral operators.
In this paper, Radial Basis Function network (RBF) is used for modelling and predicting the daily global solar radiation data using other meteorological data such as air temperature, sunshine duration, and relative humidity. These data were recorded in the period 1998-2002 at Al-Madinah (Saudi Arabia) by the National Renewable Energy Laboratory. Four RBF-models have been developed for predicting the daily global solar radiation. It was found that the RBF-model which uses the sunshine duration and air temperature as input parameters, gives accurate results as the correlation coefficient in this case is 98.80%. A comparative study between developed RBF, Multilayer perceptron and conventional regression models are presented and discussed in this paper, In addition, an application for estimating the sizing of a stand-alone PV system at Al-Maidinah is presented in order to show the effectiveness of the developed RBF-model.
de Morais, Lilia Aparecida Salgado
2011-01-01
O objetivo deste trabalho foi resgatar o conhecimento tradicional de pequenos produtores sobre técnicas alternativas utilizadas no controle fitossanitário, bem como avaliar a percepção dos mesmos sobre o horário de coleta, secagem e armazenamento das plantas utilizadas. O trabalho de campo foi realizado no Assentamento de Base Agroecológica Sepé-Tiaraju (Serra Azul-SP). Utilizou-se o método Bola de Neve resultando em dez entrevistados. Realizaram-se entrevistas estruturadas e semi-estruturada...
Photocathodes based on semiconductor superlattices for streak tubes for IR region of 0.9-1.0 um
Nolle, Eduard L.
1995-05-01
A possibility of temporal analysis of picosecond light pulses in the IR region with the help of photocathodes based on semiconductor superlattices (SL) of type I (InP/InGaAs) with Schottky barrier is discussed. A new principle of avalanche photoelectron emission from such an SL at interband absorption of light is suggested. The principle is based on the electrons free length path increasing in a SL with narrow quantum wells under high electric field applied to the SL. The idea makes it possible to develop a new device - avalanche photocathode with internal amplification for the IR region of 0.9-2 micrometers and temporal resolution better than 30 ps. It is proposed to use doped as well as undoped SL as basis for photocathodes sensitive to the IR radiation in the range of up to 10 micrometers . The photoemission from such structures is caused by the intersubband absorption of light in quantum wells. The use of undoped SL greatly reduced the thermoemission current of the photocathode but requires additional excitation of the SL by light pulses with energy approximately corresponding to the band gap of the narrow band gap material of the SL. The temporal resolution of such photocathodes is supposed to be less than 30 ps. The conditions for the avalanche photoelectron emission obtaining are determined, and the SL parameters which meet the requirement of maximum quantum efficiency of the photocathode are calculated.
When nozzles in the spherical vessel head are designed by area replacement method defined in the majority of pressure vessel code, the thickness of the reinforcements is so thick that the application of the thin shell theory may not be appropriate in the shell assembly problems. To obtain the solution of the thick reinforcement in the radial nozzle of the spherical vessel head subjected to radial load, the nature of the thick shell is introduced to the current solution for the thin shell: (1) use of the meridional moment at the junction in moment equilibrium equation instead of the meridional moment at middle plane of reinforcement, (2) omission of derivative of rotation in the meridional moment equation, (3) omission of double derivative of radial displacement in meridional moment equation. The current analysis based on the thin shell theory is found to be less conservative as the thickness of reinforcement increases when the middle plane of the reinforcement does not coincide with the middle plane of the main shell of pressure vessel head. The rotation modified method addressed in (2) above is applicable to the design of radial nozzle reinforced by thick shell with t/R≥0.1 in spherical pressure vessel head subjected to radial load. (orig.)
RBF Neural Networks and Radial Fuzzy Systems
Coufal, David
Cham: Springer, 2015 - (Iliadis, L.; Jayne, C.), s. 206-215. (Communications in Computer and Information Science. 517). ISBN 978-3-319-23981-1. ISSN 1865-0929. [EANN 2015. International Conference /16./. Rhodes (GR), 25.09.2015-28.09.2015] R&D Projects: GA MŠk(CZ) LD13002 Institutional support: RVO:67985807 Keywords : RBF neural networks * Radial fuzzy systems * Conjunctive and implicative rule base s Subject RIV: IN - Informatics, Computer Science
Numerical simulation of radial compressor stage
Luňáček O.; Syka T.
2013-01-01
Article describes numerical simulations of air flow in radial compressor stage in NUMECA CFD software. In simulations geometry variants with and without seals are used. During tasks evaluating was observed seals influence on flow field and performance parameters of compressor stage. Also is described CFDresults comparison with results from design software based on experimental measurements and monitoring of influence of seals construction on compressor stage efficiency.
Costa, Cátia Filipa Pereira da
2011-01-01
Dissertação apresentada à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Psicologia Jurídica As situações de abuso sexual de crianças nas quais o perpetrador pertence ao sexo feminino obtiveram ao longo dos últimos anos um acrescido reconhecimento por parte da comunidade científica, evidenciado pelo significativo incremento das investigações no âmbito desta temática consistindo na sua maioria estudos de caso. Um conjunto de particularidades encont...
Radial lean direct injection burner
Khan, Abdul Rafey; Kraemer, Gilbert Otto; Stevenson, Christian Xavier
2012-09-04
A burner for use in a gas turbine engine includes a burner tube having an inlet end and an outlet end; a plurality of air passages extending axially in the burner tube configured to convey air flows from the inlet end to the outlet end; a plurality of fuel passages extending axially along the burner tube and spaced around the plurality of air passage configured to convey fuel from the inlet end to the outlet end; and a radial air swirler provided at the outlet end configured to direct the air flows radially toward the outlet end and impart swirl to the air flows. The radial air swirler includes a plurality of vanes to direct and swirl the air flows and an end plate. The end plate includes a plurality of fuel injection holes to inject the fuel radially into the swirling air flows. A method of mixing air and fuel in a burner of a gas turbine is also provided. The burner includes a burner tube including an inlet end, an outlet end, a plurality of axial air passages, and a plurality of axial fuel passages. The method includes introducing an air flow into the air passages at the inlet end; introducing a fuel into fuel passages; swirling the air flow at the outlet end; and radially injecting the fuel into the swirling air flow.
Shiva Kumar
2012-01-01
Full Text Available Radial basis function neural networks (RBFNNs, which is a relatively new class of neural networks, have been investigated for their applicability for prediction of performance and emission characteristics of a diesel engine fuelled with waste cooking oil (WCO. The RBF networks were trained using the experimental data, where in load percentage, compression ratio, blend percentage, injection timing, and injection pressure were taken as the input parameters, and brake thermal efficiency (BTE, brake specific energy consumption (BSEC, exhaust gas temperature (, and engine emissions were used as the output parameters. The number of RBF centers was selected randomly. The network was initially trained using variable width values for the RBF units using a heuristic and then was trained by using fixed width values. Studies showed that RBFNN predicted results matched well with the experimental results over a wide range of operating conditions. Prediction accuracy for all the output parameters was above 90% in case of performance parameters and above 70% in case of emission parameters.
Sabetghadam, Fereidoun; Soltani, Elshan
2015-10-01
The moving boundary conditions are implemented into the Fourier pseudo-spectral solution of the two-dimensional incompressible Navier-Stokes equations (NSE) in the vorticity-velocity form, using the radial basis functions (RBF). Without explicit definition of an external forcing function, the desired immersed boundary conditions are imposed by direct modification of the convection and diffusion terms. At the beginning of each time-step the solenoidal velocities, satisfying the desired moving boundary conditions, along with a modified vorticity are obtained and used in modification of the convection and diffusion terms of the vorticity evolution equation. Time integration is performed by the explicit fourth-order Runge-Kutta method and the boundary conditions are set at the beginning of each sub-step. The method is applied to a couple of moving boundary problems and more than second-order of accuracy in space is demonstrated for the Reynolds numbers up to Re = 550. Moreover, performance of the method is shown in comparison with the classical Fourier pseudo-spectral method.
Douma, M.; Ligierko, G.; Angelov, I.
2008-10-01
The need for information has increased exponentially over the past decades. The current systems for constructing, exploring, classifying, organizing, and searching information face the growing challenge of enabling their users to operate efficiently and intuitively in knowledge-heavy environments. This paper presents SpicyNodes, an advanced user interface for difficult interaction contexts. It is based on an underlying structure known as a radial map, which allows users to manipulate and interact in a natural manner with entities called nodes. This technology overcomes certain limitations of existing solutions and solves the problem of browsing complex sets of linked information. SpicyNodes is also an organic system that projects users into a living space, stimulating exploratory behavior and fostering creative thought. Our interactive radial layout is used for educational purposes and has the potential for numerous other applications.
Jónsdóttir, Kristjana Ýr; Jensen, Eva B. Vedel
The growth of planar and spatial objects is often modelled using one-dimensional size parameters, e.g. volume, area or average radius. We take a more detailed approach and model how the boundary of a growing object expands in time. We mainly consider star-shaped planar objects. The model can be...... regarded as a dynamic deformable template model. The limiting shape of the object may be circular but this is only one possibility among a range of limiting shapes. An application to tumour growth is presented. Two extensions of the model, involving time series and Lévy bases, respectively, are briefly...
Detonation in supersonic radial outflow
Kasimov, Aslan R.
2014-11-07
We report on the structure and dynamics of gaseous detonation stabilized in a supersonic flow emanating radially from a central source. The steady-state solutions are computed and their range of existence is investigated. Two-dimensional simulations are carried out in order to explore the stability of the steady-state solutions. It is found that both collapsing and expanding two-dimensional cellular detonations exist. The latter can be stabilized by putting several rigid obstacles in the flow downstream of the steady-state sonic locus. The problem of initiation of standing detonation stabilized in the radial flow is also investigated numerically. © 2014 Cambridge University Press.
Radial propagators and Wilson loops
Leupold, S; Leupold, Stefan; Weigert, Heribert
1996-01-01
We present a relation which connects the propagator in the radial (Fock-Schwinger) gauge with a gauge invariant Wilson loop. It is closely related to the well-known field strength formula and can be used to calculate the radial gauge propagator. The result is shown to diverge in four-dimensional space even for free fields, its singular nature is however naturally explained using the renormalization properties of Wilson loops with cusps and self-intersections. Using this observation we provide a consistent regularization scheme to facilitate loop calculations. Finally we compare our results with previous approaches to derive a propagator in Fock-Schwinger gauge.
翟红林; 陈晓峰; 陈兴国; 胡之德
2004-01-01
结合了径向基神经网络较强模式分类能力与概率神经网络运算简单的优点,提出了一种径向基概率神经网络模型,并应用于小儿厌食症的辅助诊断,通过对119例样本数据的处理,获得了92.4%的准确率.此外,偏最小二乘法的分析结果表明,Zn元素与小儿厌食症关系最为紧密.%Based on a radial basis function probabilistic neural network model, which combined the powerful capability of the pattern classification of radial basis function neural network and the simple operation of probabilistic neural network, a new approach of assisted diagnosis for infancy anorexia was developed and applied to 119 samples, with an accuracy rate of 92%. In addition, the result of partial least squares analysis indicated that Zn was the most important element that was closely related to infancy anorexia..
CONGENITAL RADIAL DYSPLASIA: A CASE REPORT
Venkatram Reddy
2015-08-01
Full Text Available Congenital radial dysplasia, also referred to as radial club hand , means deficiency along the preaxial or radial side of the extremity. It ranges from hypoplasia of the thumb to variou s degrees of radial hypoplasia. We present one such rare case of type 4 congenital unilateral isolated radial dysplasia with carpel anomaly , reported to our department in SVS medical C ollege, Mahabubanagar, Telangana state
Sá, Daniela Pereira de
2012-01-01
Nos últimos anos, a investigação na área têxtil tem-se focado no desenvolvimento de materiais têxteis multifuncionais para as mais diversas aplicações. Incluem-se, nesses novos produtos, os materiais têxteis anti-microbianos, devido à sua grande aplicabilidade no sector biomédico. O objectivo da produção destes materiais é a obtenção de produtos com um efeito anti-microbiano duradouro, seguro e com um largo espectro de acção, sem no entanto, danificar as propriedades físicas...
Criopreservação de sêmen canino com um diluidor à base de água de coco
Cardoso Rita de Cássia Soares
2002-01-01
Full Text Available A estocagem do sêmen por um longo período, permitindo o seu posterior uso representa uma importante ferramenta para criadores que desejam resguardar o potencial genético de seus reprodutores. O objetivo do presente trabalho foi avaliar o efeito da água de coco, gema de ovo e glicerol sobre o resfriamento e a criopreservação de sêmen canino. A fração espermática do ejaculado de 12 cães foi avaliada macro e microscopicamente e, em seguida, dividida em quatro alíquotas, submetidas à congelação em quatro diluidores, sendo todos à base água de coco e diferindo quanto à presença ou não da gema de ovo e glicerol. Durante o resfriamento, não se observou diferença entre os grupos, entretanto, após o congelamento e descongelamento, o diluidor adicionado de gema de ovo e glicerol (ACGG foi superior aos demais quanto à motilidade, vigor e morfologia espermática. Nesse grupo, os valores de motilidade (%, vigor (0-5 e alterações morfológicas totais (% após a descongelação foram 56,7 ± 16,1, 3,4 ± 0,5 e 23,8 ± 8,4, respectivamente. Diante dos resultados, concluiu-se que a adição de gema de ovo e glicerol ao diluidor foi necessária para a preservação da qualidade espermática após criopreservação de sêmen canino.
Tachoastrometry: astrometry with radial velocities
Pasquini, L; Lombardi, M; Monaco, L; Leão, I C; Delabre, B
2014-01-01
Spectra of composite systems (e.g., spectroscopic binaries) contain spatial information that can be retrieved by measuring the radial velocities (i.e., Doppler shifts) of the components in four observations with the slit rotated by 90 degrees in the sky. By using basic concepts of slit spectroscopy we show that the geometry of composite systems can be reliably retrieved by measuring only radial velocity differences taken with different slit angles. The spatial resolution is determined by the precision with which differential radial velocities can be measured. We use the UVES spectrograph at the VLT to observe the known spectroscopic binary star HD 188088 (HIP 97944), which has a maximum expected separation of 23 milli-arcseconds. We measure an astrometric signal in radial velocity of 276 \\ms, which corresponds to a separation between the two components at the time of the observations of 18 $\\pm2$ milli-arcseconds. The stars were aligned east-west. We describe a simple optical device to simultaneously record p...
Crounel Marins
2011-08-01
Full Text Available
Moreles, Miguel Ángel; Mejía, Francisco
2010-01-01
La caracterización de acuíferos es un problema fundamental en Geohidrología. El problema consiste en estimar los parámetros fenomenológicos a partir de datos de alturas piezométricas. Los datos de campo son obtenidos en pozos de observación los cuales son pocos y dispersos en el acuífero. En este trabajo proponemos una solución al problema de estimación en dos partes. Primero utilizamos un método de interpolación con funciones de base radial para generar datos suficientes de alturas piezomét...
Accretion, radial flows and abundance gradients in spiral galaxies
Pezzulli, Gabriele
2015-01-01
The metal-poor gas continuously accreting onto the discs of spiral galaxies is unlikely to arrive from the intergalactic medium (IGM) with exactly the same rotation velocity as the galaxy itself and even a small angular momentum mismatch inevitably drives radial gas flows within the disc, with significant consequences to galaxy evolution. Here we provide some general analytic tools to compute accretion profiles, radial gas flows and abundance gradients in spiral galaxies as a function of the angular momentum of accreting material. We generalize existing solutions for the decomposition of the gas flows, required to reproduce the structural properties of galaxy discs, into direct accretion from the IGM and a radial mass flux within the disc. We then solve the equation of metallicity evolution in the presence of radial gas flows with a novel method, based on characteristic lines, which greatly reduces the numerical demand on the computation and sheds light on the crucial role of boundary conditions on the abunda...
Radial propagators and Wilson loops
Leupold, S. [Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany); Weigert, H. [School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
1996-12-01
We present a relation which connects the propagator in the radial (Fock-Schwinger) gauge with a gauge-invariant Wilson loop. It is closely related to the well-known field strength formula and can be used to calculate the radial gauge propagator. The result is shown to diverge in four-dimensional space even for free fields; its singular nature is, however, naturally explained using the renormalization properties of Wilson loops with cusps and self-intersections. Using this observation we provide a consistent regularization scheme to facilitate loop calculations. Finally, we compare our results with previous approaches to derive a propagator in Fock-Schwinger gauge. {copyright} {ital 1996 The American Physical Society.}
Velocidades radiales en Collinder 121
Arnal, M.; Morrell, N.
Se han llevado a cabo observaciones espectroscópicas de unas treinta estrellas que son posibles miembros del cúmulo abierto Collinder 121. Las mismas fueron realizadas con el telescopio de 2.15m del Complejo Astronómico El Leoncito (CASLEO). El análisis de las velocidades radiales derivadas del material obtenido, confirma la realidad de Collinder 121, al menos desde el punto de vista cinemático. La velocidad radial baricentral (LSR) del cúmulo es de +17 ± 3 km.s-1. Esta velocidad coincide, dentro de los errores, con la velocidad radial (LSR) de la nebulosa anillo S308, la cual es de ~20 ± 10 km.s-1. Como S308 se encuentra físicamente asociada a la estrella Wolf-Rayet HD~50896, es muy probable que esta última sea un miembro de Collinder 121. Desde un punto de vista cinemático, la supergigante roja HD~50877 (K3Iab) también pertenecería a Collinder 121. Basándonos en la pertenencia de HD~50896 a Collinder 121, y en la interacción encontrada entre el viento de esta estrella y el medio interestelar circundante a la misma, se estima para este cúmulo una distancia del orden de 1 kpc.
RAVE The RAdial Velocity Experiment
Steinmetz, M
2002-01-01
RAVE (RAdial Velocity Experiment) is an ambitious program to conduct an all-sky survey (complete to V = 16) to measure the radial velocities, metallicities and abundance ratios of 50 million stars using the 1.2-m UK Schmidt Telescope of the Anglo-Australian Observatory (AAO), together with a northern counterpart, over the period 2006 - 2010. The survey will represent a giant leap forward in our understanding of our own Milky Way galaxy, providing a vast stellar kinematic database three orders of magnitude larger than any other survey proposed for this coming decade. RAVE will offer the first truly representative inventory of stellar radial velocities for all major components of the Galaxy. The survey is made possible by recent technical innovations in multi-fiber spectroscopy; specifically the development of the 'Echidna' concept at the AAO for positioning fibers using piezo-electric ball/spines. A 1m-class Schmidt telescope equipped with an Echidna fiber-optic positioner and suitable spectrograph would be ab...
Causes of Secondary Radial Nerve Palsy and Results of Treatment.
Reichert, Pawel; Wnukiewicz, Witold; Witkowski, Jarosław; Bocheńska, Aneta; Mizia, Sylwia; Gosk, Jerzy; Zimmer, Krzysztof
2016-01-01
BACKGROUND The aim of this study was to analyze the causes that lead to secondary damage of the radial nerve and to discuss the results of reconstructive treatment. MATERIAL AND METHODS The study group consisted of 33 patients treated for radial nerve palsy after humeral fractures. Patients were diagnosed based on clinical examinations, ultrasonography, electromyography, or nerve conduction velocity. During each operation, the location and type of nerve damage were analyzed. During the reconstructive treatment, neurolysis, direct neurorrhaphy, or reconstruction with a sural nerve graft was used. The outcomes were evaluated using the Medical Research Council (MRC) scales and the quick DASH score. RESULTS Secondary radial nerve palsy occurs after open reduction and internal fixation (ORIF) by plate, as well as by closed reduction and internal fixation (CRIF) by nail. In the case of ORIF, it most often occurs when the lateral approach is used, as in the case of CRIF with an insertion interlocking screws. The results of the surgical treatment were statistically significant and depended on the time between nerve injury and revision (reconstruction) surgery, type of damage to the radial nerve, surgery treatment, and type of fixation. Treatment results were not statistically significant, depending on the type of fracture or location of the nerve injury. CONCLUSIONS The potential risk of radial nerve neurotmesis justifies an operative intervention to treat neurological complications after a humeral fracture. Adequate surgical treatment in many of these cases allows for functional recovery of the radial nerve. PMID:26895570
SARASPATHY NAIDOO TERROSO GAMA DE MENDONÃ‡A
2009-07-01
Full Text Available
Mediante a utilizaÃ§Ã£o de um questionÃ¡rio sobre hÃ¡bitos de consumo e da tÃ©cnica focal de entrevistas, obteve-se um perfil de comportamento de consumo de alimentos processados e in natura de duas amostras da populaÃ§Ã£o adulta e idosa brasileira. A primeira foi realizada com 73 voluntÃ¡rios do NÃºcleo de Estudos da Terceira Idade (NETI da Universidade Federal de Santa Catarina, em FlorianÃ³polis, estado de Santa Catarina e a segunda com 295 participantes, selecionados aleatoriamente na cidade de SerranÃ³polis do IguaÃ§u, estado do ParanÃ¡. Os dados coletados revelaram que ambas as populaÃ§Ãµes tÃªm expectativas quanto a alimentos saudÃ¡veis e apresentaram dificuldades na leitura do texto de rotulagem dos alimentos. Face aos resultados apresentados, este trabalho visou o desenvolvimento do protÃ³tipo de um alimento a base de aveia e soja, enriquecido com minerais, vitaminas e prebiÃ³ticos, de forma a atender nÃ£o somente Ã s expectativas apontadas mas tambÃ©m Ã s necessidades fisiolÃ³gicas e sensoriais desta populaÃ§Ã£o. Apresenta tambÃ©m como sugestÃ£o para o painel secundÃ¡rio do texto de rotulagem, um tamanho de fonte de letra acima de 10 para melhor visualizaÃ§Ã£o das informaÃ§Ãµes nutricionais constantes nos rÃ³tulos dos alimentos. PALAVRAS-CHAVE: Expectativas de consumo; adultos; idosos; alimento enriquecido; prebiÃ³ticos.
PRECISION RADIAL VELOCITIES WITH CSHELL
Radial velocity (RV) identification of extrasolar planets has historically been dominated by optical surveys. Interest in expanding exoplanet searches to M dwarfs and young stars, however, has motivated a push to improve the precision of near-infrared RV techniques. We present our methodology for achieving 58 m s-1 precision in the K band on the M0 dwarf GJ 281 using the CSHELL spectrograph at the 3 m NASA Infrared Telescope Facility. We also demonstrate our ability to recover the known 4 MJUP exoplanet Gl 86 b and discuss the implications for success in detecting planets around 1-3 Myr old T Tauri stars.
Radial vibrations of BPS skyrmions
Adam, C; Romanczukiewicz, T; Wereszczynski, A
2016-01-01
We study radial vibrations of spherically symmetric skyrmions in the BPS Skyrme model. Concretely, we numerically solve the linearised field equations for small fluctuations in a skyrmion background, both for linearly stable oscillations and for (unstable) resonances. This is complemented by numerical solutions of the full nonlinear system, which confirm all the results of the linear analysis. In all cases, the resulting fundamental excitation provides a rather accurate value for the Roper resonance, supporting the hypothesis that the BPS Skyrme model already gives a reasonable approximate description of this resonance.
Customer-Based Brand Equity de Destinos Turísticos: um estudo sobre Foz do Iguaçu-PR, Brasil
Eliane Cristine Francisco; Maria Isabel Teles; Paulo Muller Prado
2012-01-01
ResumoEste trabalho tem por objetivo mensurar o valor de marca de destinos turísticos de acordo com a percepção do consumidor/turista. Para tanto, como contexto empírico do estudo foi realizado um survey na localidade turística de Foz do Iguaçu com 286 casos válidos. Quatro dimensões foram anal...
Antônio Cezar Bornia
2013-10-01
Full Text Available A escala instrumento de medida de atitude empreendedora (Imae, desenvolvida por Souza e Lopes Jr. (2005, contém duas dimensões: prospecção e inovação, e gestão e persistência. Com a finalidade de verificar a validade e o intervalo em que propicia a medida de atitude empreendedora, além de investigar sua capacidade de discriminar a resposta que o indivíduo está apto a dar, o objetivo deste artigo é validar a escala Imae por meio do modelo de resposta gradual da teoria da resposta ao item (TRI, que revolucionou a teoria de medidas. A TRI, construtos da psicologia utilizados em estudos de discriminação de respostas, em especial em grandes amostras de respondentes a um determinado fenômeno, é constituída de modelos matemáticos que relacionam um ou mais traços latentes (não observados de um indivíduo com a probabilidade de este dar uma determinada resposta a um item. O ponto crucial da TRI é que ela leva em consideração o item particularmente, sem relevar os escores totais, portanto as conclusões não dependem apenas do teste ou questionário, mas de cada elemento que o compõe. Os principais resultados encontrados foram a identificação de dois níveis da escala, denominados âncoras, que permitem interpretar tendências de pessoas com atitude empreendedora e a constatação de que os itens da escala Imae apresentam boa capacidade de discriminar a resposta que o indivíduo está apto a dar, o que confere qualidade aos itens e, portanto, à escala. A importância deste estudo reside no papel fundamental que a atitude desempenha nas escolhas que as pessoas fazem em relação à própria vida, de modo a ajudá-las a determinar seus próprios atos.
Pan, Xiaoduo; Tian, Xiangjun; Li, Xin; Xie, Zhenghui; Shao, Aimei; Lu, Chunyan
2012-09-01
Doppler radar observations with high spatial and temporal resolution can effectively improve the description of small-scale structures in the initial condition and enhance the mesoscale and microscale model skills of numerical weather prediction (NWP). In this paper, Doppler radar radial velocity and reflectivity are simultaneously assimilated into a weather research and forecasting (WRF) model by a proper orthogonal-decomposition-based ensemble, three-dimensional variational assimilation method (referred to as PODEn3DVar), which therefore forms the PODEn3DVar-based radar assimilation system (referred to as WRF-PODEn3DVar). The main advantages of WRF-PODEn3DVar over the standard WRF-3DVar are that (1) the PODEn3DVar provides flow-dependent covariances through the evolving ensemble of short-range forecasts, and (2) the PODEn3DVar analysis can be obtained directly without an iterative process, which significantly simplifies the assimilation. Results from real data assimilation experiments with the WRF model show that WRF-PODEn3DVar simulation yields better rainfall forecasting than radar retrieval, and radar retrieval is better than the standard WRF-3DVar assimilation, probably because of the flow-dependence character embedded in the WRF-PODEn3DVar.
Mendes, Elisabete Maria Lucas
2012-01-01
O relatório aqui apresentado insere-se no âmbito da prática educativa do Mestrado em Educação Pré-Escolar da Escola Superior de Educação de Coimbra para a aquisição do grau de mestre em Educação Pré-Escolar. Neste relatório estão presentes experiências-chave que ao serem descritas de forma crítico-reflexiva demonstram um percurso formativo, no qual se procurou desenvolver as competências teórico-práticas adquiridas no 1.º ciclo de estudos a fim de construir uma prática docente ao nível de...
In this article a method based on the assumption that the average position of the myocardial wall can be localized by means of statistical analysis of the distribution count density, and not on edge detection, is used to measure LVEF. SPET myocardial perfusion images, gated in eight time bins, were recorded in 50 patients 60 min after the injection of 925 MBq technetium-99m tetrofosmin. Masking of non-myocardial structures and thresholding resulted in images in which only myocardial walls had significant non-zero values. The distance of the wall relative to the centre of the cavity was calculated in the three-dimentional space as the first moment of the count rate distribution along radii originating in the centre of the cavity. LVEF was calculated using, for each time bin, the sum of the cube of all distances as an estimate of the cavity volume. The method required minimal operator interventions and was successful in all patients, including those with severe perfusion defects. Intraobserver and interobserver variability was excellent, with regression coefficients of 0.97 and standard deviations of 4.5% and 4.7%, respectively. For 30 patients, the measurements were validated against planar equilibrium radionuclide angiography (ERNA) that was obtained within an interval of 1 week. LVEF ranged from 12% to 88%. Agreement between the two methods was excellent. The Bland-Altman analysis did not show any apparent trend in the differences between ERNA and gated SPET over a wide range of ejection fractions. The standard deviation of the differences was 3.1%. In addition no relationship was found between the two methods and the severity of perfusion defects. (orig.). With 7 figs
Spherical radial basis functions, theory and applications
Hubbert, Simon; Morton, Tanya M
2015-01-01
This book is the first to be devoted to the theory and applications of spherical (radial) basis functions (SBFs), which is rapidly emerging as one of the most promising techniques for solving problems where approximations are needed on the surface of a sphere. The aim of the book is to provide enough theoretical and practical details for the reader to be able to implement the SBF methods to solve real world problems. The authors stress the close connection between the theory of SBFs and that of the more well-known family of radial basis functions (RBFs), which are well-established tools for solving approximation theory problems on more general domains. The unique solvability of the SBF interpolation method for data fitting problems is established and an in-depth investigation of its accuracy is provided. Two chapters are devoted to partial differential equations (PDEs). One deals with the practical implementation of an SBF-based solution to an elliptic PDE and another which describes an SBF approach for solvi...
Radial and nonradial periods of Delta Scuti
Five periods have been discussed by Smith (1981) for the prototype variable star delta Scuti. The main one, at 0.193772 day, has long been identified as the radial fundamental mode. The others have not been clearly understood, but the second radial overtone is probably the correct identification for the 0.116366 day period. The other three at 0.186891, 0.189435, and 0.211157 day seem to be nonradial modes because of their long periods. The first of these seems to have l = 2 and m = -2 as observed by Smith. Table 1 gives these observed periods. Based on the Fitch (1981) nonradial pulsation constants, the 4.48 hour (.187 day) period seems to be a p1 mode, but as we shall see, we find that this identification is not very certain. The goal of this paper is to use our nonradial nonadiabatic computing program to predict periods in this range for a model matching the observed parameters of delta Scuti and to identify all five periods
Carlos E. S. Volpato
2002-01-01
Full Text Available Um protótipo de cortador de base para o seguimento pantográfico do perfil em colhedoras de cana-de-açúcar, foi projetado e construído e seu desempenho de flutuação foi avaliado em função da força normal de reação do perfil (F N. O trabalho foi conduzido em uma caixa de solo, o protótipo montado sobre um carro porta-ferramentas e submetido a ensaios nos quais variaram três tipos de perfil: senoidal, rampa ascendente e rampa descendente, duas amplitudes do perfil, 0,025 e 0,05 m e cinco velocidades de deslocamento: 0,69, 1,12, 1,48, 1,82 e 2,12 m s-1. Os melhores resultados foram verificados para os perfis em rampa, tanto ascendente quanto descendente, independentemente da amplitude do perfil e da velocidade de deslocamento e, também, para perfil senoidal de ambas as amplitudes, com velocidade de deslocamento inferior a 1,48 m s-1. Os resultados demonstraram que o protótipo ainda é passível de ajustes, uma vez que o desempenho de flutuação sobre o perfil pode ser melhorado através da utilização de técnicas de otimização.A prototype of base cutter for sugar-cane harvester was designed and built. The floating performance was evaluated as a function of the profile reaction force (F N. The prototype was tested in a soil box using a carrier car running on sinusoidal and ramp type profiles with amplitudes of 0.025 and 0.05 m. The travel speeds used were of five different levels: 0.69, 1.12, 1.48, 1.82 and 2.12 m s-1. The best results were obtained while running on ramp profiles, both ascending or descending, independent of the profile amplitude or the travel speed. The sinusoidal profile showed good results for the travel speed of 1.48 m s-1, for both the amplitudes tested. The results demonstrated that the prototype may still be adjusted, as the floating action on the profile can be improved through the use of optimization techniques.
Esperanza Huerta
2009-08-01
Full Text Available The objective of this work was to construct a simple index based on the presence/absence of different groups of soil macrofauna to determine the ecological quality of soils. The index was tested with data from 20 sites in South and Central Tabasco, Mexico, and a positive relation between the model and the field observations was detected. The index showed that diverse agroforestry systems had the highest soil quality index (1.00, and monocrops without trees, such as pineapple, showed the lowest soil quality index (0.08. Further research is required to improve this model for natural systems that have very low earthworm biomass (O objetivo deste trabalho foi construir um índice simples com base na presença/ausência de diferentes grupos da macrofauna edáfica para auxiliar na determinação da qualidade ecológica dos solos. O índice foi testado com dados de 20 locais do sul e centro do Estado de Tabasco, México, e foi observada uma correlação positiva entre o dados gerados pelo modelo e pelas observações de campo. O índice de qualidade de solo mostrou que diversos sistemas agroflorestais tiveram a mais alta qualidade de solo (1,0 e que os monocultivos sem árvores, como o de abacaxi, apresentaram a qualidade de solo mais baixa (0,08. Este modelo precisa ser melhor desenvolvido para ser aplicado eficientemente em sistemas que apresentam naturalmente baixas densidades de minhocas (<10 g m-2 e número elevado de espécies de minhocas (5-7, como ocorre em solos de floresta tropical, cujo índice de qualidade de solo apresentou valores médios (0,5. A aplicação desse índice precisará de um guia ilustrado para os seus usuários. Mais estudos são necessários para testar o seu emprego por fazendeiros.
Osni Hoss
2013-01-01
Full Text Available O presente artigo tem por objetivo apresentar um estudo sobre a importância do planejamento e a busca de informações úteis e precisas na hora de investir em projetos, demonstrando a necessidade de alinhar as decisões aos objetivos estratégicos da empresa. Inicialmente, através de uma revisão da literatura acerca do tema abordado, foram apresentados os principais conceitos e definições sobre os critérios de análise de investimentos considerados mais relevantes e sobre planejamento estratégico. A partir disso, através da aplicação dos critérios, buscou-se demonstrar a viabilidade de um investimento para a ampliação das atividades na empresa Zincar Indústria e Comercio de Carrinhos para Supermercado Ltda, localizada na região sudoeste do Paraná, visando oferecer subsídios para a tomada de decisões por parte dos gestores, através do alinhamento das decisões com a estratégia corporativa da empresa.DOI:10.5585/gep.v3i3.113
LAZZARETTI E; W. Bettiol
1997-01-01
Um produto constituido de pó-molhável (PBBS) formulado à base de células (60g) e de metabólitos (60g) de Bacillus subtilis, argila (480g), espalhante (7,92g) e água (2400ml), moído e seco, mostrou-se semelhante aos tratamentos com fungicidas recomendados para o controle de Rhizoctonia solani, Aspergillus sp. e Sclerotinia sclerotiorum em sementes de feijão; Pyricularia oryzae e Rhinchosporium sativum em sementes de arroz; e Cercospora kikuchii, Phomopsis phaseoli e Fusarium spp. em sementes d...
Costa, Pedro Francisco Mendes Pinheiro da Providência e
2014-01-01
Resumo (Bases para um Plano de Acção da Salvaguarda dos Revestimentos e Acabamentos Tradicionais em Centros Históricos: o Plano de Cor do Centro Histórico de Coimbra ) No decurso do século XX, os sistemas construtivos tradicionais foram lenta e directamente substituídos pelos de natureza industrial. Como consequência, os sistemas tradicionais de construção, particularmente as técnicas de revestimentos e acabamentos históricos, foram aos poucos caindo no esquecimento. Por esse motivo, as...
Radial gravitational gliding on passive margins
Cobbold, P. R.; Szatmari, P.
1991-03-01
Gravitational gliding of uppermost sediments down a passive margin is possible if there is a basal layer of evaporite or other soft material to allow detachment. In examples from the Gulf of Mexico and the Brazilian margin, gliding has produced three main structural domains: an uppermost domain of downdip extension; an intermediate domain of rigid gliding; and a lowermost domain of downdip contraction. Domain boundaries are established by changes in slope. In this paper, we examine three kinds of gravitational gliding, depending on the paths followed by material particles. In ideal parallel gliding, particle paths are parallel straight lines, trending downslope. This should occur where the margin is perfectly straight. In ideal radial gliding, particle paths are radii of a circle and the margin is shaped like a circular cone. Natural margins will not have ideal shapes; but divergent gliding will tend to occur off coastal salients; convergent gliding, off coastal re-entrants. A simple kinematic model based on ductile behaviour illustrates some essential features of radial gliding. Changes in radius during divergent gliding produce strike-parallel extension; during convergent gliding, they produce strike-parallel contraction. Vertical strains also differ. Divergent gliding produces an uppermost domain of strong vertical thinning, balanced by extensions in all horizontal directions. Similarly, convergent gliding produces a lowermost domain of strong vertical thickening, balanced by contractions in all horizontal directions. These deformed states cannot be restored by simple techniques based on section balancing. We have done three experiments using analogue materials: sand, to model the brittle behaviour of sediments; silicone putty, to model the ductile behaviour of basal layers of evaporite. The experiments were properly scaled to account for gravitational forces. Experiment I reproduced convergent gliding above a basement with a conical upper surface. Strike
Radial smoothing and closed orbit
A complete simulation leading to a description of one of the error curves must involve four phases: (1) random drawing of the six set-up points within a normal population having a standard deviation of 1.3 mm; (b) random drawing of the six vertices of the curve in the sextant mode within a normal population having a standard deviation of 1.2 mm. These vertices are to be set with respect to the axis of the error lunes, while this axis has as its origins the positions defined by the preceding drawing; (c) mathematical definition of six parabolic curves and their junctions. These latter may be curves with very slight curvatures, or segments of a straight line passing through the set-up point and having lengths no longer than one LSS. Thus one gets a mean curve for the absolute errors; (d) plotting of the actually observed radial positions with respect to the mean curve (results of smoothing)
VanOsdol, John G.
2013-06-25
The disclosure provides a pulse jet mixing vessel for mixing a plurality of solid particles. The pulse jet mixing vessel is comprised of a sludge basin, a flow surface surrounding the sludge basin, and a downcoming flow annulus between the flow surface and an inner shroud. The pulse jet mixing vessel is additionally comprised of an upper vessel pressurization volume in fluid communication with the downcoming flow annulus, and an inner shroud surge volume separated from the downcoming flow annulus by the inner shroud. When the solid particles are resting on the sludge basin and a fluid such as water is atop the particles and extending into the downcoming flow annulus and the inner shroud surge volume, mixing occurs by pressurization of the upper vessel pressurization volume, generating an inward radial flow over the flow surface and an upwash jet at the center of the sludge basin.
Néstor Durango
2005-01-01
Full Text Available En este artículo se presentan los resultados obtenidos en la investigación realizada para establecer la influencia e importancia de las variables cantidad de yuca, relación superficie a volumen del material de los pedazos de yuca, velocidad del ventilador y temperatura del aire de recirculación, en el proceso de secado de yuca en un modelo de secador de flujo radial. La metodología experimental utilizada fue el diseño de experimentos factoriales, la cual, mediante una serie de análisis estadísticos, posibilitó la caracterización del proceso para un tiempo de secado de tres horas y la obtención de un modelo matemático que describe su comportamiento.
A fully relativistic radial fall
Spallicci, Alessandro D. A. M.; Ritter, Patxi
2014-10-01
Radial fall has historically played a momentous role. It is one of the most classical problems, the solutions of which represent the level of understanding of gravitation in a given epoch. A gedankenexperiment in a modern frame is given by a small body, like a compact star or a solar mass black hole, captured by a supermassive black hole. The mass of the small body itself and the emission of gravitational radiation cause the departure from the geodesic path due to the back-action, that is the self-force. For radial fall, as any other non-adiabatic motion, the instantaneous identity of the radiated energy and the loss of orbital energy cannot be imposed and provide the perturbed trajectory. In the first part of this paper, we present the effects due to the self-force computed on the geodesic trajectory in the background field. Compared to the latter trajectory, in the Regge-Wheeler, harmonic and all others smoothly related gauges, a far observer concludes that the self-force pushes inward (not outward) the falling body, with a strength proportional to the mass of the small body for a given large mass; further, the same observer notes a higher value of the maximal coordinate velocity, this value being reached earlier during infall. In the second part of this paper, we implement a self-consistent approach for which the trajectory is iteratively corrected by the self-force, this time computed on osculating geodesics. Finally, we compare the motion driven by the self-force without and with self-consistent orbital evolution. Subtle differences are noticeable, even if self-force effects have hardly the time to accumulate in such a short orbit.
Effects of radial velocity on line profiles and images from the standard thin disk
无
2010-01-01
This paper has derived the general formulae of observed line profiles based on the effects of radial velocity on the standard thin disk fluid around a rotating black hole. Through the ray-tracing method the line profiles of different parameters have been calculated. Comparison of the line profiles with and without a radial velocity shows that the effects of radial velocity on line profiles cannot be neglected in most cases. In both cases the accretive disk imaging shape remains unchanged.
Ben-Nun, R.; Sheintuch, M.; Kysela, B.; Konfršt, J. (Jiří); I. Fořt
2015-01-01
We characterize turbulent flow from radial impellers in stirred tanks, formulating semi-analytical predictions based on conventional turbulent-jet theory and the general framework of scalar dispersion in turbulent shear flows. This work introduces a novel formulation of the radial-discharge flow as two separate spatial regions along the radial axis: the zone of flow establishment (ZFE) and the zone of established flow (ZEF). We discover and analyze resulting critical improvements in the predi...
Elisete Silva Pedrazzani
2002-12-01
Full Text Available O trabalho descreve um programa de atualização do perfil de vacinação numa cidade de porte médio, através da implantação de um Banco de Dados que possibilita a consolidação das informações de cada criança com relação à cobertura vacinal em um registro único, nominal e de maneira rápida. O resultado final revelou que o envolvimento efetivo de todos os seguimentos sociais, profissionais e instituições participantes tornam-se primordiais para que se obtenha dados confiáveis e que se concretize essa proposta como uma das estratégias de vigilância em saúde.El trabajo describe un programa de actualización del perfil de vacunación en una ciudad mediana, por medio de la implantación de una Base de Datos que posibilita la consolidación de las informaciones de cada niño con relación a la cobertura vacunal en un registro único, nominal y de manera rápida. El resultado final demostró que el compromiso efectivo de todos los segmentos sociales, profesionales e institucionales participantes, se hace primordial para que consigan datos confiables y que se concretice esta propuesta como una de las estrategias de vigilancia en salud.This paper describes an actualization program of the vaccination profile in a medium-size city, through the introduction of a Database that allows the consolidation of information from each child in relation to the vaccination coverage in a nominal, fast and unified registration. The final result revealed that the effective involvement of all the social and professional segments and participating institutions are of prime importance in obtaining reliable data and in turning this proposal into one of the health vigilance strategies.
Explicação histórica com base nos artefactos : um estudo com alunos do 7º ano de escolaridade
Fernandes, Carmen da Conceição Melo
2009-01-01
Dissertação de mestrado em Educação (área de especialização em Supervisão Pedagógica em Ensino de História e Ciências Sociais) Este estudo de natureza descritiva, inserido numa linha de investigação em cognição histórica, pretendeu indagar sobre como lidam os alunos do 7º ano com a explicação histórica de um período tão remoto como a Pré-História, através da observação/interpretação de artefactos museológicos. A amostra foi constituída por alunos do 7º ano de escolaridade, com idades...
Radial Stiffness of a ferrofluid seal
Ravaud, Romain; Pinho, Marcos; Lemarquand, Guy; Dauchez, Nicolas; Génevaux, Jean-Michel; Lemarquand, Valérie; Brouard, Bruno
2009-01-01
This paper presents an analytical model for calculating the shape and the radial stiffness of ferrofluid seals used as radial bearings and this theoretical value of the radial stiffness is compared to measured values. This approach is interesting for the design of loudspeakers. Moreover, the concept of magnetic pressure is used to determine the seal shape as well as its energy. This paper corresponds to the case in which the ferrofluid seal is submitted to a high magnetic field. Furthermore, ...
Hollow Cathode With Multiple Radial Orifices
Brophy, John R.
1992-01-01
Improved hollow cathode serving as source of electrons has multiple radial orifices instead of single axial orifice. Distributes ion current more smoothly, over larger area. Prototype of high-current cathodes for ion engines in spacecraft. On Earth, cathodes used in large-diameter ion sources for industrial processing of materials. Radial orientation of orifices in new design causes current to be dispersed radially in vicinity of cathode. Advantageous where desireable to produce plasma more nearly uniform over wider region around cathode.
A CONSERVATIVE VIEW OF RADIAL KERATOTOMY
Steven; Olkowski; Walter; J.; Stark; John; D.; Gottsch; Gerri; Goodman; Daniel; Goodman; A.E.; Maumenee; Ivan; Esente
1991-01-01
It has been known for almost a century that radial keratotomy (RK) will flatten the cornea and reduce myopia. Since the introduction of radial keratotomy (RK) in the United States by Bores in 1978, there have been many published studies documenting the effects of this procedure. The questions. about radial keratotomy today are not only quantitative but also qualitative in nature. We know this technique can flatten the cornea, but how reliably can the results be predicted? Does the patient benefit suffic...
Stirling Engine With Radial Flow Heat Exchangers
Vitale, N.; Yarr, George
1993-01-01
Conflict between thermodynamical and structural requirements resolved. In Stirling engine of new cylindrical configuration, regenerator and acceptor and rejector heat exchangers channel flow of working gas in radial direction. Isotherms in regenerator ideally concentric cylinders, and gradient of temperature across regenerator radial rather than axial. Acceptor and rejector heat exchangers located radially inward and outward of regenerator, respectively. Enables substantial increase in power of engine without corresponding increase in diameter of pressure vessel.
Virginia Figueiredo
2005-12-01
Full Text Available Partindo do quadro de René Magritte, La trahison des images (Ceci n'est pas une pipe, este texto pretende tecer um comentário sobre as relações entre arte e realidade. Visando esse objetivo, tentarei interpretar a obra do pintor belga à luz do ensaio heideggeriano sobre a "Origem da obra de arte", não sem antes passar em revista alguns resultados da análise contida no livro de Michel Foucault, assim como algumas reflexões do filósofo da arte norte-americano Arthur Danto.Departing from the painting La trahison des images (Ceci n'est pas une pipe, by René Magritte, this paper intends to comment the relationships between art and reality. Aiming this objective, I will try to interpret the work of the Belgian painter according to Heidegger's essay on "The Origin of the work of art", and also reviewing some of the results of the analysis made by Michel Foulcault in his book, along with some thoughts of Arthur Danto.
Radial voidage variation in fixed beds of fuel wood pellets
Fixed beds of fuel wood are commonly found in numerous processes: storage and transportation, drying and thermal conversion such as combustion or gasification. Pellets in particular are mostly used as fuel for domestic heating boilers. The characterization of spatial voidage distribution is of great importance for flow and reactor modelling. The present study focuses on the radial porosity variations of cylindrical beds of commercially available wood pellets. The experimental procedure is based on the classical technique of consolidating packed beds with a resin. The radial voidage distribution of three different cylindrical beds is determined by image analysis of sections of the solidified packing. The results are discussed and summarized in a mathematical expression correlating the radial voidage distribution depending on packing core porosity and dimensionless distance from the tube wall. -- Highlights: ► Packing characteristics for commercially available wood pellets were investigated. ► Radial porosity variations of cylindrical pellets beds were investigated. ► Epoxy resin consolidated packings were investigated by image analysis. ► Mathematical term for radial voidage distribution of pellet packing was derived.
Radial velocity monitoring of Kepler heartbeat stars
Shporer, Avi; Isaacson, Howard; Hambleton, Kelly; Thompson, Susan E; Prsa, Andrej; Kurtz, Donald W; Howard, Andrew W; O'Leary, Ryan M
2016-01-01
Heartbeat stars (HB stars) are a class of eccentric binary stars with close periastron passages. The characteristic photometric HB signal evident in their light curves is produced by a combination of tidal distortion, heating, and Doppler boosting near orbital periastron. Many HB stars continue to oscillate after periastron and along the entire orbit, indicative of the tidal excitation of oscillation modes within one or both stars. These systems are among the most eccentric binaries known, and they constitute astrophysical laboratories for the study of tidal effects. We have undertaken a radial velocity (RV) monitoring campaign of Kepler HB stars in order to measure their orbits. We present our first results here, including a sample of 21 Kepler HB systems, where for 19 of them we obtained the Keplerian orbit and for 3 other systems we did not detect a statistically significant RV variability. Results presented here are based on 218 spectra obtained with the Keck/HIRES spectrograph during the 2015 Kepler obse...
Static Isotropic Spacetimes with Radially Imperfect Fluids
Konopka, Tomasz
2009-01-01
When solving the equations of General Relativity in a symmetric sector, it is natural to consider the same symmetry for the geometry and stress-energy. This implies that for static and isotropic spacetimes, the most general natural stress-energy tensor is a sum of a perfect fluid and a radial imperfect fluid component. In the special situations where the perfect fluid component vanishes or is a spacetime constant, the solutions to Einstein's equations can be thought of as modified Schwarzschild and Schwarzschild-de Sitter spaces. Exact solutions of this type are derived and it is shown that whereas deviations from the unmodified solutions can be made small, among the manifestations of the imperfect fluid component is a shift in angular momentum scaling for orbiting test-bodies at large radius. Based on this effect, the question of whether the imperfect fluid component can feasibly describe dark matter phenomenology is addressed.
Desenvolvimento de um sistema de controlo para um motor a funcionar segundo um Ciclo de Otto
Abrantes, Ricardo Afonso Pereira Braz
2008-01-01
O presente trabalho tinha o como propósito o desenvolvimento de um sistema de controlo para gerir um grupo propulsor constituído por um motor a funcionar segundo o ciclo de Otto e uma caixa de velocidades. Era também objectivo do trabalho testar as soluções propostas. Neste trabalho é sugerido um método de teste de injectores, um método de gestão do motor e da caixa de velocidades. No método de gestão do motor incluem-se rotinas de geração de mistura e posterior igniç...
Matching problems in pulse power radial transmission lines
In this report we study the power transfer from a generator along a coaxial transmission line followed by a radial transmission line into a load, which in our application is a pseudo-spark plasma of about one millimeter diameter and about 15 cm in length. First the theoretical background based on transmission line theory is described. Then numerical results are presented. The main conclusion is that when matching the pulse power generator to the pseudo-spark plasma, the effect of the impedance transformation caused by the radial transmission line has to be taken into account. The conditions to obtain an optimal match are described. (orig.)
Radial smoothing for improving laser-beam irradiance uniformity.
Zhong, Zheqiang; Hou, Pengcheng; Zhang, Bin
2015-12-15
Laser-beam irradiation uniformity is a key issue in inertial confinement fusion research. We propose a radial smoothing (RS) approach in which the speckle in a focal plane is smoothed by the radial redistribution through fast focal zooming. This focal zooming is generated by introducing the periodical spherical wavefront modulation to the laser beam, based on an optical Kerr medium and its pump laser with the temporal profile of a Gaussian pulse train. The utilization of RS significantly improves the laser-beam uniformity without obvious impact on the performance of the high-power laser system. PMID:26670528
Investigation of Rotor Radial Rotating Error upon AMB System
WANG Kai; LI Yan
2006-01-01
This paper first suggests the use of the Fourier frequency transmission method of two dimensions function (2D FFT) to analyze radial rotating errors that occurred in a rotor. Based on this method a magnetic rotor is measured. The authors point out that the main cause to affect radial rotating accuracy of the rotating shaft at a high speed is the dynamic imbalance of the shaft itself. Finally the feed-forward control scheme is suggested to improve the accuracy of the shaft in an active magnetic bearing (AMB) system.
José Renato Munhoz
2001-08-01
Full Text Available Neste trabalho apresenta-se um modelo baseado em programação linear e programação de metas para apoiar decisões no processo de mistura e na distribuição de suco concentrado congelado de laranja. Explora-se a importância das decisões do processo de mistura para a análise da logística de distribuição do suco de laranja, além das decisões de transporte e armazenagem. O modelo utiliza conceitos conhecidos da literatura de problemas de mistura e planejamento da produção com múltiplos produtos, estágios e períodos, e foi resolvido por meio da linguagem de modelagem GAMS (General Algebraic Modeling System. Um estudo de caso foi realizado numa empresa de suco de laranja localizada no interior do estado de São Paulo, e os resultados preliminares obtidos são promissores.This work proposes a model based on linear programming and goal programming to support decisions in the blending process and distribution of frozen concentrated orange juice. This study explores the importance of blending decisions for the logistic analysis of the orange juice distribution, besides transportation and storage decisions. The model utilizes well-known concepts from the literature of blending problems and multistage, multiproduct and multiperiod production planning problems, and it was solved using the GAMS (General Algebraic Modeling System programming language. A case study was developed in an orange juice industry located in São Paulo State, and the preliminary results are promising.
Radial nodalization effects on BWR [boiling water reactor] stability calculations
Computer simulations have shown that stability calculations in boiling water reactors (BWRs) are very sensitive to a number of input parameters and modeling assumptions. In particular, the number of thermohydraulic regions (i.e., channels) used in the calculation can affect the results of decay ratio calculations by as much as 30%. This paper presents the background theory behind the observed effects of radial nodalization in BWR stability calculations. The theory of how a radial power distribution can be simulated in time or frequency domain codes by using ''representative'' regions is developed. The approximations involved in this method of solution are reviewed, and some examples of the effect of radial nodalization are presented based on LAPUR code solutions. 2 refs., 4 figs., 2 tabs
Radial velocity study of the CP star Epsilon Ursae Majoris
Sokolov, N A
2009-01-01
In this Letter, the radial velocity variability of the chemically peculiar star Epsilon Ursae Majoris ($\\epsilon$ UMa) from the sharp cores of the hydrogen lines is investigated. This study is based on the ELODIE archival data obtained at different phases of the rotational cycle. The star exhibits low-amplitude radial velocity variations with a period of P=5.0887 d. The best Keplerian solution yields an eccentricity e=0.503 and a minimum mass ~14.7$M_{\\rm Jup}$ on the hypothesis that the rotational axis of $\\epsilon$ UMa is perpendicular to the orbital plane. This result indicate that the companion is the brown-dwarf with the projected semi-amplitude variation of the radial velocity $K_{\\rm 2}$=135.9 km/sec and the sine of inclination times semi-major axis $a_{2}$sin(i)=0.055 au.
Comparison of a radial fractional transport model with tokamak experiments
Kullberg, A.; Morales, G. J.; Maggs, J. E.
2014-03-01
A radial fractional transport model [Kullberg et al., Phys. Rev. E 87, 052115 (2013)], that correctly incorporates the geometric effects of the domain near the origin and removes the singular behavior at the outer boundary, is compared to results of off-axis heating experiments performed in the Rijnhuizen Tokamak Project (RTP), ASDEX Upgrade, JET, and DIII-D tokamak devices. This comparative study provides an initial assessment of the presence of fractional transport phenomena in magnetic confinement experiments. It is found that the nonlocal radial model is robust in describing the steady-state temperature profiles from RTP, but for the propagation of heat waves in ASDEX Upgrade, JET, and DIII-D the model is not clearly superior to predictions based on Fick's law. However, this comparative study does indicate that the order of the fractional derivative, α, is likely a function of radial position in the devices surveyed.
Comparison of a radial fractional transport model with tokamak experiments
Kullberg, A., E-mail: kulladam@ucla.edu; Morales, G. J.; Maggs, J. E. [Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095 (United States)
2014-03-15
A radial fractional transport model [Kullberg et al., Phys. Rev. E 87, 052115 (2013)], that correctly incorporates the geometric effects of the domain near the origin and removes the singular behavior at the outer boundary, is compared to results of off-axis heating experiments performed in the Rijnhuizen Tokamak Project (RTP), ASDEX Upgrade, JET, and DIII-D tokamak devices. This comparative study provides an initial assessment of the presence of fractional transport phenomena in magnetic confinement experiments. It is found that the nonlocal radial model is robust in describing the steady-state temperature profiles from RTP, but for the propagation of heat waves in ASDEX Upgrade, JET, and DIII-D the model is not clearly superior to predictions based on Fick's law. However, this comparative study does indicate that the order of the fractional derivative, α, is likely a function of radial position in the devices surveyed.
Eye and Iris Detection Using Projection and Radial Symmetry Transform
XIANG Shu-lan; CAO Cheng; Aishy Amer
2010-01-01
This paper presents an eye and iris detection algorithm for human facial images. The authors combine three features of the eye to develop the algorithm: 1) the pixels surrounding the eyes are more variable than other parts of the face; 2) eye pixels are darker than their neighbors; 3) eyes often exhibit radial symmetric properties. Through the first feature, two rough regions of both eyes are detected on the face. Eye masks are then formed based on the second feature, and a fast radial symmetry transform is applied to the two rough regions of both eyes. Finally, accurate iris centers are located by searching the maximum value of the radial symmetry transform results. Using 450 human facial images from the Caltech face database, experiments show that the success rate of the proposed method is 91.7%. The effectiveness of the method was also verified through detection of video frames.
Systematics of radial excitations in heavy-light hadrons
Woloshyn, R M
2016-01-01
Some simple expectations for the quark mass dependence of radial excitation energies of heavy-light hadrons based on consideration of nonrelativistic quantum mechanics are discussed. Experimental and theoretical results are reviewed in light of these expectations. Some new lattice QCD results for masses of Lambda_b and Sigma_b baryons are presented.
Numerical calculation and analysis of radial force on the single-action vane pump
Unbalanced radial force is a serious adversity that restricts the working pressure and reduces service life of the single-action vane pump. For revealing and predicting the distribution of radial force on the rotor, a numerical simulation about its transient flow field was performed by using dynamic mesh method with RNG κ ε-turbulent model. The details of transient flow characteristic and pressure fluctuation were obtained, and the radial force and periodic variation can be calculated based on the details. The results show: the radial force has a close relationship with the pressure pulsation; the radial force can be reduced drastically by optimizing the angle of port plate and installing the V-shaped cavity; if the odd number vanes are chosen, it will help reduce the radial force of rotor and optimize the pressure fluctuation effectively