Academic literature on the topic 'Radial configuration'
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Journal articles on the topic "Radial configuration"
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Lv, Hui, Zhaoquan Chen, Shilin Dong, Zhongyi Zhu, Xin Xie, and Yanfen Zhong. "Analytical Study of Structural Conformation and Prestressing State of Drum-Shaped Honeycomb Quad-Strut Cable Dome Structure with Different Calculation Methods." Buildings 14, no. 1 (2024): 179. http://dx.doi.org/10.3390/buildings14010179.
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Building upon the analytical study of the structural configuration and prestress state of the drum-shaped quad-strut cable dome, we conducted further investigation into its structural configuration. By employing the nodal equilibrium equations to solve the prestress state analysis of the cable dome, we compared the effects of two different cable laying methods on the prestress state of the cable dome structure. These methods include equal length of the radial horizontal projection of the upper chord ridge cables and equal radial chord length of the upper chord ridge cables. The analysis results show that the radial length of the top chord and its corresponding radial horizontal projection length of the cable dome structure can effectively reflect the trend of the prestress state of the structural configuration. Furthermore, by using a rise-to-span ratio of 0.11 as a threshold, the cable dome configuration is categorized into the flat spheroidal structural configuration and the small hemispheroidal structural configuration. When the structure is analyzed using a small rise-to-span ratio, the difference in prestress calculations between the two structural configurations is found to be less than 10%. Additionally, the structure exhibits a more uniform distribution of prestress, with the prestress gradually increasing from the inner circle to the outer circle. However, when the rise-to-span ratio increases, the difference between the prestress calculation results of the two configurations also increases, emphasizing the need to deploy upper chord ridge cables based on equal radial chord lengths (arc lengths). The research presented in this paper provides a novel insight into the structural topological form and prestress state calculation of cable domes with this configuration.
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Jiang, Yandan, Xuekai He, Baoliang Wang, Zhiyao Huang, and Manuchehr Soleimani. "On the Performance of a Capacitively Coupled Electrical Impedance Tomography Sensor with Different Configurations." Sensors 20, no. 20 (2020): 5787. http://dx.doi.org/10.3390/s20205787.
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Capacitively coupled electrical impedance tomography (CCEIT) is a new kind of electrical resistance tomography (ERT) which realizes contactless measurement by capacitive coupling and extends traditional resistance measurement to total impedance measurement. This work investigates the performance of a CCEIT sensor with three different configurations, including the unshielded configuration, the shielded configuration A (the CCEIT sensor with the external shield) and the shielded configuration B (the CCEIT sensor with both the external shield and the radial screens). The equivalent circuit models of the measurement electrode pair of the CCEIT sensor with different configurations were developed. Additionally, three CCEIT prototypes corresponding to the three configurations were developed. Both the simulation work and experiments were carried out to compare various aspects of the three CCEIT prototypes, including the sensitivity distribution, the impedance measurement and the practical imaging performance. Simulation results show that shielded configurations improve the overall average sensitivity of the sensitivity distributions. Shielded configuration A contributes to improve the uniformity of the sensitivity distributions, while shielded configuration B reduces the uniformity in most cases. Experimental results show that the shielded configurations have no significant influence on the imaging quality of the real part of impedance measurement, but do make sense in improving the imaging performance of the imaginary part and the amplitude of impedance measurement. However, configuration B (with radial screens) has no significant advantage over configuration A (without radial screens). This work provides an insight into how shielding measures influence the performance of the CCEIT sensor, in addition to playing an important role in shielding unwanted noise and disturbances. The research results can provide a useful reference for further development of CCEIT sensors.
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Li, Jinfeng, and Haolin Zhou. "Impact of Radial Grounding Model Granularity on Directivity of 433 MHz Monopole Antennas with Flat and Inclined Radials for ISM IoT Applications." Annals of Emerging Technologies in Computing 9, no. 1 (2025): 44–57. https://doi.org/10.33166/aetic.2025.01.003.
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Grounding is a critical factor in the performance of quarter-wave monopole antennas. Previous studies have explored finite, continuous grounding configurations with one- and two-dimensional variations in size for a 433 MHz vertical monopole antenna, identifying optimal geometries that maximize directivity while minimizing material costs and grounding size. However, these findings are not directly applicable to mission-critical environments (e.g., space, airborne, underwater, or ground-based applications) where continuous metallic grounding may be unavailable. This study extends the investigation to discretized grounding configurations, specifically employing radial monopoles formed by metal rods arranged in sparse or dense radial patterns. Both flat planar and inclined configurations of radial rods are analysed, with a focus on understanding the influence of design parameters, such as radial length and inclination angle, on antenna directivity and radiation patterns—key factors affecting signal reception in wireless communication systems, particularly in applications such as the internet of things (IoT). Using the Method of Moments (MoM) for simulation, the study provides practical guidelines for optimizing the design of 433 MHz monopole antennas constrained by finite and discrete grounding structures. The results indicate that an elevated radial configuration, consisting of five radials inclined at 5° from the monopole plane (equivalent to 85° from the horizontal plane) with a radial length of 2.5 meters, achieves a directivity of 9.23 dBi at 433 MHz. This represents a significant improvement over the flat planar configuration, which achieves a directivity of 6.23 dBi under the same conditions. These findings are particularly relevant for mobile communication, Internet of Things (IoT) devices, and radiofrequency (RF) systems requiring high performance from vertical monopole antennas in challenging grounding environments
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Feng, Jianjun, Friedrich-Karl Benra, and Hans Josef Dohmen. "Numerical Investigation on Pressure Fluctuations for Different Configurations of Vaned Diffuser Pumps." International Journal of Rotating Machinery 2007 (2007): 1–10. http://dx.doi.org/10.1155/2007/34752.
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Numerical simulations on impeller-diffuser interactions in radial diffuser pumps are conducted to investigate the unsteady flow, and more attention is paid to pressure fluctuations on the blade and vane surfaces. Calculations are performed at different operating points, different blade number configurations, and different radial gaps between the impeller and diffuser to examine their effects on the unsteady flow. Computational results show that a jet-wake flow structure is observed at the impeller outlet. The biggest pressure fluctuation on the blade is found to occur at the impeller trailing edge, on the pressure side near the impeller trailing edge, and at the diffuser vane leading edge, independent of the flow rate, radial gap, and blade number configuration. All of the flow rate, blade number configuration, and radial gap influence significantly the pressure fluctuation and associated unsteady effects in the diffuser pumps.
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Groot Jebbink, Erik, Thijs G. Ter Mors, Cornelis H. Slump, Robert H. Geelkerken, Suzanne Holewijn, and Michel MPJ Reijnen. "In vivo geometry of the kissing stent and covered endovascular reconstruction of the aortic bifurcation configurations in aortoiliac occlusive disease." Vascular 25, no. 6 (2017): 635–41. http://dx.doi.org/10.1177/1708538117708912.
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Objectives Various configurations of kissing stent (KS) configurations exist and patency rates vary. In response the covered endovascular reconstruction of the aortic bifurcation configuration was designed to minimize mismatch and improve outcome. The aim of the current study is to compare geometrical mismatch of kissing stent with the covered endovascular reconstruction of the aortic bifurcation configuration in vivo. Methods Post-operative computed tomographic data and patient demographics from 11 covered endovascular reconstruction of the aortic bifurcation and 11 matched kissing stent patients were included. A free hand region of interest and ellipse fitting method were applied to determine mismatch areas and volumes. Conformation of the stents to the vessel wall was expressed using the D-ratio. Results Patients were mostly treated for Rutherford category 2 and 3 (64%) with a lesion classification of TASC C and D in 82%. Radial mismatch area and volume for the covered endovascular reconstruction of the aortic bifurcation group was significantly lower compared to the kissing stent configuration ( P < 0.05). The D-ratio did not significantly differ between groups. Measurements were performed with good intra-class correlation. There were no significant differences in the post-procedural aortoiliac anatomy. Conclusions The present study shows that radial mismatch exists in vivo and that large differences in mismatch exist, in favour of the covered endovascular reconstruction of the aortic bifurcation configuration. Future research should determine if the decreased radial mismatch results in improved local flow profiles and subsequent clinical outcome.
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Resnik, Linda, Shana L. Klinger, and Katherine Etter. "The DEKA Arm: Its features, functionality, and evolution during the Veterans Affairs Study to optimize the DEKA Arm." Prosthetics and Orthotics International 38, no. 6 (2013): 492–504. http://dx.doi.org/10.1177/0309364613506913.
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Background and aim: DEKA Integrated Solutions Corp. (DEKA) was charged by the Defense Advanced Research Project Agency to design a prosthetic arm system that would be a dramatic improvement compared with the existing state of the art. The purpose of this article is to describe the two DEKA Arm prototypes (Gen 2 and Gen 3) used in the Veterans Affairs Study to optimize the DEKA Arm. Technique: This article reports on the features and functionality of the Gen 2 and Gen 3 prototypes discussing weight, cosmesis, grips, powered movements Endpoint, prosthetic controls, prosthetist interface, power sources, user notifications, troubleshooting, and specialized socket features; pointing out changes made during the optimization efforts. Discussion: The DEKA Arm is available in three configurations: radial configuration, humeral configuration, and shoulder configuration. All configurations have six preprogrammed grip patterns and four wrist movements. The humeral configuration has four powered elbow movements. The shoulder configuration uses Endpoint Control to perform simultaneous multi-joint movements. Three versions of foot controls were used as inputs. The Gen 3 incorporated major design changes, including a compound wrist that combined radial deviation with wrist flexion and ulnar deviation with wrist extension, an internal battery for the humeral configuration and shoulder configuration, and embedded wrist display. Clinical relevance The DEKA Arm is an advanced upper limb prosthesis, not yet available for commercial use. It has functionality that surpasses currently available technology. This manuscript describes the features and functionality of two prototypes of the DEKA Arm, the Gen 2 and the Gen 3.
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Gozali, H. R. B. Moch, Suprihadi Prasetyono, and Dimas Oktasya Eka Kumala Putra. "ANALISIS PERBANDINGAN KEANDALAN SISTEM JARINGAN DISTRIBUSI BERKONFIGURASI RADIAL DAN LOOP MENGGUNAKAN METODE RIA (RELIABILITY INDEX ASSESSMENT)." Jurnal Arus Elektro Indonesia 6, no. 3 (2020): 63. http://dx.doi.org/10.19184/jaei.v6i3.19723.
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Electrical energy is a very important requirement for human life. The supply of electrical energy itself consists of electricity generation, power transmission and distribution. In the distribution of electricity, there are several networks that function to distribute electrical energy to customers, the majority of which are network configuration, namely radial and loop. In order to maintain the continuity of the distribution of electrical energy, a good level of reliability is required. In order to determine the reliability of the distribution system, the reliability index is determined, namely SAIFI, SAIDI and CAIDI. Several methods that can be used to find a distribution system reliability index include the RIA (Reliability Index Assessment) method, which is an approach used to predict disturbances in a distribution system based on the system topology and data regarding component reliability. In this study, we compared two configurations using one feeder, namely the Giri feeder which is assumed to have a radial configuration and a loop configuration. By using the RIA (Reliability Index Assessment) method on a Giri feeder with a radial configuration, the SAIFI reliability index is obtained at 1.595 times / year, SAIDI is 12.8092 hours / year, CAIDI is 8.0309 hours / year, while for a feeder with a loop configuration the SAIFI value is equal to 1,651 times / year, SAIDI is 1,7276 hours / year, CAIDI is 1,0416 hours / year.
 
 Keywords — Reliability Index, Distribution System, Reliability Index Assessment, SAIFI, SAIDI, CAIDI
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An, Guo Ping, Bing Bing Zhang, Yong Sheng Zhao, and Li Gang Cai. "Effects of Bearing Configuration on Spindle Dynamic Characteristics." Applied Mechanics and Materials 437 (October 2013): 76–80. http://dx.doi.org/10.4028/www.scientific.net/amm.437.76.
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This article investigates the effects of bearing configuration on the spindle dynamic characteristics. First, an analytical model of spindle is proposed and the bearing sets radial stiffness is calculated. Second, the spindle analytical model is developed to perform modal analysis and harmonic response analysis with ANSYS, and then obtain the natural frequency and FRF under different bearing configurations. The result suggests that bearing configuration has little effect on the natural frequency of spindle system and the FRF amplitude corresponding to the 1st natural frequency under back to back configuration or face to face configuration is relatively small. Finally, the proposed model is validated by modal experiment.
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Wyart, Jean-François. "On the interpretation of complex atomic spectra by means of the parametric Racah–Slater method and Cowan codes1This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas." Canadian Journal of Physics 89, no. 4 (2011): 451–56. http://dx.doi.org/10.1139/p10-112.
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Theoretical studies of electronic configurations of several lanthanide ions in the Racah–Slater approach were performed with the standard suite of codes by R.D. Cowan, including a fitting of energy parameters. Configuration interaction was considered explicitly in the low configurations and was processed by effective parameters for doubly-excited far configurations. Mean errors lower than 100 cm–1 were obtained. Systematic differences are noticed between radial integrals calculated by ab initio PHFR and the Pfit fitted values. The consistency of the scaling factors SF(P) = Pfit/PHFR and of the effective parameters for far configuration effects is shown. In an application to Tm II, the predicted transition probabilities compared well with line intensities and led to the finding of new energy levels. In Nd II, the configuration 4f5 is identified.
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Kandil, Ali, Lei Hou, Mohamed Sharaf, and Ayman A. Arafa. "Configuration angle effect on the control process of an oscillatory rotor in 8-pole active magnetic bearings." AIMS Mathematics 9, no. 5 (2024): 12928–63. http://dx.doi.org/10.3934/math.2024631.
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<abstract> <p>In an active magnetic bearings (AMBs) model, every pair of opposite poles is aligned at an angle with the horizontal axis. In some configurations, there is a pair of poles which is in line with the horizontal axis. In other configurations, the same pair of poles might make a nonzero angle with the horizontal axis. This paper focused on the effect of changing such a configuration angle on the control process of an oscillatory rotor in an 8-pole active magnetic bearings model. Adopting the proportional-derivative (PD) control algorithm, the radial or Cartesian control techniques were applied. It was found that the rotor's oscillation amplitudes were not affected by the change in the configuration angle, even if its rotation speed and eccentricity were varied in the radial control scheme. However, the amplitudes were severely affected by the change in the configuration angle except at a specific angle in the Cartesian control scheme. The approximate modulating amplitudes and phases of the rotor's oscillations were extracted by the method of multiple-scales and a stability condition was tested based on the eigenvalues of the corresponding Jacobian matrix.</p> </abstract>
Dissertations / Theses on the topic "Radial configuration"
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Izacard, Olivier. "Modélisation et contrôle hamiltonien du transport radial dans les plasmas magnétisés à configuration linéaire." Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22091.
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Dans l'optique de produire de l'énergie à travers les réactions de fusion, nous sommes amenés à étudier des phénomènes physiques qui ont lieux dans les tokamaks. Les instabilités qui existent dans les tokamaks peuvent fortement dégrader le confinement et ont un impacte sur le fonctionnement de futurs réactions à fusion. Des mesures révèlent un fort transport radial. Même si ce transport radial est en partie est une conséquence des collisions, l'instabilité d'interchange est la source dominante à ce transport puisque le type de plasmas nous intéressant sont faiblement collisionnels. Dans la limite non collisionnelle, la description hamiltonienne permet de décrire le système dynamique des particules du plasmas dans un champ électromagnétique. Nous donnons de l'importance à cette description afin de pouvoir accéder aux outils hamiltoniens.Nous travaillons sur la modélisation et le contrôle hamiltonien du transport radial. Après avoir écrit le modèle hamiltonien des particules d'un plasma magnétisé, nous introduisons les réductions de ce modèle lagrangien en modèles eulériens réduits afin de s'adapter à certains calculs numériques et théoriques. Ces réductions donnent lieux aux équations fluides hamiltonien. Cependant, nous montrons que ces réductions peuvent faire perdre la propriété hamiltonienne. En particulier pour obtenir un modèle ayant la température des ions (puisqu'elle n'est pas négligeable au centre du plasma), nous montrons la procédure conservant la propriété hamiltonienne à partir du modèle sans température des ions.Quant à l'étude du transport radial, nous appliquons une des propriétés hamiltoniennes (le contrôle) afin de créer une barrière de transport par des perturbations du système. Nous étudions de manière idéale l'effet du contrôle à travers la dynamique lagrangienne des traceurs appelés particules test. Nous faisons particulièrement des efforts dans la prise en compte des contraintes numériques et expérimentales. Nous montrons notamment la robustesse du contrôle lors de l'application des perturbations par des sondes de Langmuir.Finalement, nous étudions l'application du contrôle dans un modèle eulérien décrivant la rétroaction du plasmas (à travers la densité et le potentiel électrique) lorsque nous appliquons les perturbations. Cette étape permet de prendre en compte le couplage du système plasma-perturbations. En utilisant un code fluide permettant de décrire le plasma de bord lors de perturbations générées par des sondes de Langmuir. Nous développons un algorithme permettant de calculer le contrôle en tout temps en fonction du potentiel électrique. Nous montrons alors que la valeur moyenne du potentiel électrique joue un rôle important pour l'application du contrôle dans un modèle fluide<br>In order to produce energy through fusion reactions, we are led to study of physical phenomena that occur in tokamaks. The instabilities that exist in tokamaks can significantly degrade the confinement and have an impact on the operation of future fusion reactors. Measurements reveal a strong radial transport. Although this is partly a consequence of collisions, the interchange instability is the dominant source to transport since the type of plasmas that interest us are weakly collisional. Within non collisional limit, the Hamiltonian description used to describe the dynamical system of charged particles in an electromagnetic field. We give importance to this description in order to access the Hamiltonian tools.We are working on modeling and control Hamiltonian of radial transport. After writing the Hamiltonian model of particles in a magnetized plasma, we introduced some reductions from Lagrangian models to Eulerian reduced models in order to accommodate some theoretical and numerical calculations. These places give the Hamiltonian fluid equations. However, we show that these reductions may lose the Hamiltonian property. In particular for a model with the ion temperature (not neglected at the center of the plasma), we show the procedure preserving the Hamiltonian property from the model without ion temperature.As for the study of radial transport, we apply one of the Hamiltonian properties (the control) to create a transport barrier by perturbations of the system. We are looking ideally the effect of control through the Lagrangian dynamics of tracers called test particles. We make particular efforts in the consideration of numerical and experimental constraints. We show the robustness of control when applying perturbations by Langmuir probes.Finally, we study the application of control in an Eulerian model describing the feedback of plasma (through the density and the electric potential) when we apply the perturbations. This step allows to take into account the coupling of the system plasma-perturbations. We use a numerical code to describe the plasma at the edge during perturbations generated by Langmuir probes. We develop an algorithm to calculate the control at all times depending on the electric potential. Finally we show that the average value of electric potential plays an important role in the implementation of control in a fluid model
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Narayan, Aditya. "Investigations on Air-cooled Air Gap Membrane Distillation and Radial Waveguides for Desalination." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78779.
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This thesis presents investigations on air-cooled air gap membrane distillation for desalination and the application of radial waveguides based on total internal reflection for solar thermal desalination.
Using an air-cooled design for an air gap membrane distillation (AGMD) process may result in significantly lower energy requirements for desalination. Experiments were conducted on AGMD module to study the effect of air gap, support mesh conductivity and hydrophobicity, condensing surface hydrophobicity. A novel modular design was used in which modules could be used in a series configuration to increase the flux value for the distillate. The output from the series configuration was found to have about three times the production from a single pass water-cooled system with the same temperature difference between the saline and clear water streams. The results also indicated that the mesh conductivity had a favorable effect on the flux value whereas the hydrophobicity of the mesh had no significant effect. The hydrophobicity of the condensing surface was favorable on two accounts: first, it led to an increase in the flux of the distillate at temperatures below 60 °C and second, the temperature difference of the saline feed when it enters and leaves the module is lower which can lead to energy savings and higher yields when used in a series configuration.
The second part of the thesis considers use of low-cost radial waveguides to collect and concentrate solar energy for use in thermal desalination processes. The optical-waveguide-based solar energy concentrators are based on total internal reflection and minimize/eliminate moving parts, tracking structures and cost. The use of optical waveguides for thermal desalination is explored using an analytical closed-form solution for the coupled optical and thermal transport of solar irradiation through a radial planar waveguide concentrator integrated with a central receiver. The analytical model is verified against and supported by computational optical ray tracing simulations. The effects of various design and operating parameters are systematically investigated on the system performance, which is quantified in terms of net thermal power delivered, aperture area required and collection efficiency. Design constraints like thermal stress, maximum continuous operation temperature and structural constraints have been considered to identify realistic waveguide configurations which are suitable for real world applications. The study provides realistic estimates for the performance achievable with radial planar waveguide concentrator-receiver configuration. In addition to this, a cost analysis has been conducted to determine the preferred design configurations that minimize the cost per unit area of the planar waveguide concentrator coupled to the receiver. Considering applications to thermal desalination which is a low temperature application, optimal design configuration of waveguide concentrator-receiver system is identified that result in the minimum levelized cost of power (LCOP).<br>Master of Science
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Chiarelli, Luis Renato. "Caracterização estática e dinâmica de um banco experimental para estudo dos coeficientes dinâmicos de um mancal radial aerostático cerâmico poroso." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-30112017-145830/.
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Este trabalho apresenta o modelo numérico de um banco experimental onde foi feita uma avaliação sobre as características estáticas do eixo e a identificação das características dinâmicas de um mancal aerostático cerâmico poroso. Nos últimos anos, o uso da cerâmica estrutural tem crescido significativamente para a concepção e fabricação de peças mecânicas. O uso da cerâmica porosa como restritor em mancais aerostáticos pode melhorar o seu desempenho relacionado com o desgaste, a estabilidade térmica, a rigidez e capacidade de carga, permitindo que eixos trabalhem com precisão a uma velocidade acima de 20.000 rpm, com pequenas folgas (40 microns). A fim de investigar este tipo de mancal foram desenvolvidas análises estáticas para obter a rigidez do eixo de suporte, assim como do mancal aerostático cerâmico poroso e identificação dinâmica para o banco experimental. As análises estáticas indicaram a rigidez do eixo e do mancal aerostático de 20,1 kN/mm e 2,6 kN/mm, respectivamente. As análises dinâmicas indicaram que a primeira frequência natural do rotor está próximo de 1365,9 Hz, o que é muito mais elevada do que a primeira frequência natural da mancal aerostático cerâmico poroso cujo valor é 775,0 Hz. Pode-se concluir que a configuração geométrica e condições de suporte escolhidos permitem uma condição robusta para prosseguir com os testes experimentais para obter as características dinâmicas do mancal poroso.<br>This work presents the numerical model of an experimental set-up where it was made an evaluation on the static characteristics of the shaft and the identification of the dynamic characteristics for an aerostatic radial porous bearing. In recent years, the use of the structural ceramic has grown significantly for design and manufacturing of mechanical parts. The use of ceramic porous as restrictor in aerostatic bearings can improve its perform related to the wear, thermal stability, stiffness and load capacity allowing that spindles work with precision at speed above 20.000 rpm with small clearances (40 microns). In order to investigate this kind of bearing were developed static analyses to obtain the stiffness of the support shaft, as well as aerostatic porous bearing and dynamic identification for experimental set-up. The static analysis indicated stiffness of shaft and aerostatic porous bearing of 20.1 kN/mm and 2.6 kN/mm, respectively. The dynamic analysis indicated that the first natural frequency of the rotor is close to 1365.9 Hz, which is much higher than the first natural frequency of the aerostatic ceramic porous bearing whose value is 775.0 Hz. One can conclude that geometrical configuration and support conditions choosen allow a robust condition to proceed in experimental tests to obtain dynamic characteristics of the porous bearing.
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Bouba, Oumarou. "Théories quantique et semi-classique des intégrales radiales de transitions dipolaires et multipolaires des états excités : Applications au calcul des forces d'oscillateur et des probabilités de transition dans l'approximation à une configuration." Orléans, 1986. http://www.theses.fr/1986ORLE0010.
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Calcul des intégrales radiales à l'approximation quasi classique (JWKB) des fonctions d'onde radiales, complétée par une description en termes de trajectoires elliptiques de l'électron optique. Obtention d'expressions analytiques de ces intégrales dont on simplifie le calcul à l'aide d'une méthode basée sur le développement limite d'une fonction bien adaptée à des calculs par interpolation ou extrapolation : elles s'expriment toutes en termes de deux fonctions fondamentales qui ne dépendent que de la différence entre deux nombres quantiques principaux effectifs des états initial et final. Déduction de forces d'oscillateur et probabilités de transition aussi précises que celles obtenues par quantique.
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Kumar, Santhosh Tekke Athayil, and santhosh kumar@anu edu au. "Experimental Studies of Magnetic Islands, Configurations and Plasma Confinement in the H-1NF Heliac." The Australian National University. Research School of Physical Sciences and Engineering, 2008. http://thesis.anu.edu.au./public/adt-ANU20080611.171513.
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Rational magnetic flux surfaces in fusion (toroidal plasma confinement) devices can break the magnetic field lines and reconnect
them in the form of magnetic islands. Formation of these magnetic islands can have a serious impact on the plasma confinement properties of the device. Islands can in general degrade the confinement by
mixing up different regions of the plasma. However there has been experimental evidence of confinement improvement by island induced transport barriers, under certain conditions. Even though there are a
large number of theoretical and experimental works on magnetic islands to date, there is clearly a paucity of convincing experimental
understanding on the nature of behaviour of islands in plasma. This thesis reports detailed experimental studies conducted on the H-1NF heliac stellarator, to gain an in-depth understanding of magnetic islands and their influence in plasma confinement.¶
Work reported in this thesis can be mainly divided into three parts: (a) high resolution imaging of vacuum magnetic islands and flux surfaces of H-1NF, (b) accurate computer modeling of H-1NF magnetic
geometry and (c) detailed experiments on magnetic islands in plasma configurations.¶
Electron-beam wire-tomography in the H-1NF has been used for the high resolution mapping of vacuum magnetic flux surfaces and islands. Point-to-point comparison of the mapping results with
computer tracing, in conjunction with an image warping technique, has enabled systematic exploration of magnetic islands and surfaces of interest. A fast mapping technique has been developed, which
significantly reduced the mapping time and made this technique suitable for mapping at higher magnetic fields.¶
Flux surface mapping has been carried out at various magnetic configurations and field strengths. The extreme accuracy of this technique has been exploited to understand the nature of error fields,
by point-by-point matching with computer tracing results. This has helped in developing a best-fit computer model for H-1NF magnetic configurations, which can predict rotational transform correct to
three decimal places. Results from plasma experiments on magnetic configuration studies are best explained by the new model.¶
Experiments with low order magnetic islands in plasma configurations yielded some new results. It has been observed that the low order magnetic islands (m = 2) near the core of the plasma serve as pockets of improved confinement region under favourable conditions. This results in significant profile modifications including enhancement of the radial electric field near the core to a large positive value. The characteristics of islands are found to be
dependent on the plasma collisionality and the island width.¶
Experiments with a magnetic configuration which exhibits no vacuum islands, but the core rotational transform very close to
low order rational value, show a spontaneous transition of the radial electric field near the core to a large positive value (nearly 5
kV/m), with a strong electric field shear (nearly 700 kV/m2) and localised improvement in confinement, during the discharge. Evidence indicates that the transition is driven by the excitation of low order magnetic islands near the axis during the plasma discharge, due to the modification of rotational transform profile by toroidal plasma currents. The situation is similar to the Core Electron-Root Confinement (CERC) observed during high temperature ECH
plasma discharges on other helical devices. This result provides an experimental evidence for the hypothesis that the threshold conditions for observing CERC can be reduced by exciting magnetic islands near
the core of the plasma.
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Jaïdane, Nejmeddine. "Etude du transfert de charge entre des atomes de soufre et des protons." Paris 7, 1987. http://www.theses.fr/1987PA077121.
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Calculs scf et ci des courbes de potentiel du systeme s+h**(+) dans les symetriplets pi et delta internenant dans la reaction, avec des orbitales moleculaires occupees representees par des orbitales atomiques polarisees et des orbitales moleculaires virtuelles donnees par la projection d'orbitales atomiques orthogonalement aux orbitales occupees. Traitement de la dynamique de l'echange de charge dans une representation diabatique ou les couplages radiaux sont nuls et l'echange de charge est induit par des couplages de type electronique. Construction d'une representation effective de dimension reduite au nombre des voies ouvertes; calcul des couplages radiaux. Resolution des equations de collision par un traitement quantique dans chaque symetrie; deduction de la constante de vitesse
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Luka, Mejić. "Методе аутоматске конфигурације софт сензора". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=110926&source=NDLTD&language=en.
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Математички модели за естимацију тешко мерљивих величина називајусе софт сензорима. Процес формирања софт сензора није тривијалан иквалитет естимације тешко мерљиве величине директно зависи одначина формирања. Недостаци постојећих алгоритама за формирањеспречавају аутоматску конфигурацију софт сензора. У овом раду суреализовани нови алгоритми који имају за сврху аутоматизацијуконфигурације софт сензора. Реализовани алгоритми решавајупроблеме проналаска оптималног сета улаза у софт сензор и кашњењасваког од њих као и одабира структуре и начина обуке софт сензоразаснованих на вештачким неуронским мрежама са радијално базиранимфункцијама.<br>Matematički modeli za estimaciju teško merljivih veličina nazivajuse soft senzorima. Proces formiranja soft senzora nije trivijalan ikvalitet estimacije teško merljive veličine direktno zavisi odnačina formiranja. Nedostaci postojećih algoritama za formiranjesprečavaju automatsku konfiguraciju soft senzora. U ovom radu surealizovani novi algoritmi koji imaju za svrhu automatizacijukonfiguracije soft senzora. Realizovani algoritmi rešavajuprobleme pronalaska optimalnog seta ulaza u soft senzor i kašnjenjasvakog od njih kao i odabira strukture i načina obuke soft senzorazasnovanih na veštačkim neuronskim mrežama sa radijalno baziranimfunkcijama.<br>Mathematical models that are used for estimation of variables that can not bemeasured in real time are called soft sensors. Creation of soft sensor is acomplex process and quality of estimation depends on the way soft sensor iscreated. Restricted applicability of existing algorithms is preventing automaticconfiguration of soft sensors. This paper presents new algorithms that areproviding automatic configuration of soft sensors. Presented algorithms arecapable of determing optimal subset of soft sensor inputs and their timedelays, as well as optimal architecture and automatic training of the softsensors that are based on artificial radial basis function networks.
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Oumarou, Bouba. "Théories quantique et semi-classique des intégrales radiales de transitions dipolaires et multipolaires des états excités applications au calcul des forces d'oscillateur et des probabilités de transition dans l'approximation à une configuration." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600169m.
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Enacheanu, Florin Bogdan. "Outils d'aide à la conduite pour le opérateurs des réseaux de distribution." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0115.
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La détermination d'une topologie caractérisée par des pertes Joule minimales conduit à résoudre un problème d'optimisation combinatoire, non linéaire avec des variables discrètes. Diverses approches ont été abordées. Après l'examen d'une recherche exhaustive, deux approches heuristiques et une approche méta heuristique, fondée sur la théorie des graphes et des matroïdes, ont été employées pour détenniner une topologie radiale optimale pour un état donné de charge et de production. Une procédure indiquant les pennutations de branches nécessaires pour transiter entre deux topologies radiales est ensuite présentée. Afin d'identifier une topologie optimale suivant une courbe de charge, une procédure fondée sur des optimisations horaires est réalisée. Finalement, des algorithmes pour l'optimisation de topologies partiellement maillées sont présentés<br>Detennining a distribution network topology characterized by minimal Joule losses leads to solve a discrete, non linear and combinatory optimization problem. Various approaches have been addressed. After exhaustive and heuristic approaches a meta heuristic approach, based on the graph and matroids theory, was developed in order to generate an optimal radial topology for a given network load and production state. A procedure was perfonned in order to realize the "step by step" branches exchange sequences for the transition between two radial topologies. An optimal radial network topology, with real load curves, was identified by hourly optimizations. Finally optimization algorithms for partially meshed topologies were finally realized
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Bui, Manh-Tuan. "Vision-based multi-sensor people detection system for heavy machines." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP2156/document.
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Ce travail de thèse a été réalisé dans le cadre de la coopération entre l’Université de Technologie de Compiègne (UTC) et le Centre Technique des Industries Mécaniques (CETIM). Nous présentons un système de détection de personnes pour l’aide à la conduite dans les engins de chantier. Une partie du travail a été dédiée à l’analyse du contexte de l’application, ce qui a permis de proposer un système de perception composé d’une caméra monoculaire fisheye et d’un Lidar. L’utilisation des caméras fisheye donne l’avantage d’un champ de vision très large avec en contrepartie, la nécessité de gérer les fortes distorsions dans l’étape de détection. A notre connaissance, il n’y a pas eu de recherches dédiées au problème de la détection de personnes dans les images fisheye. Pour cette raison, nous nous sommes concentrés sur l’étude et la quantification de l’impact des distorsions radiales sur l’apparence des personnes dans les images et nous avons proposé des approches adaptatives pour gérer ces spécificités. Nos propositions se sont inspirées de deux approches de l’état de l’art pour la détection des personnes : les histogrammes de gradient orientés (HOG) et le modèle des parties déformables (DPM). Tout d’abord, en enrichissant la base d’apprentissage avec des imagettes fisheye artificielles, nous avons pu montrer que les classificateurs peuvent prendre en compte les distorsions dans la phase d’apprentissage. Cependant, adapter les échantillons d’entrée, n’est pas la solution optimale pour traiter le problème de déformation de l’apparence des personnes dans les images. Nous avons alors décidé d’adapter l’approche de DPM pour prendre explicitement en compte le modèle de distorsions. Il est apparu que les modèles déformables peuvent être modifiés pour s’adapter aux fortes distorsions des images fisheye, mais ceci avec un coût de calculatoire supérieur. Dans cette thèse, nous présentons également une approche de fusion Lidar/camera fisheye. Une architecture de fusion séquentielle est utilisée et permet de réduire les fausses détections et le coût calculatoire de manière importante. Un jeu de données en environnement de chantier a été construit et différentes expériences ont été réalisées pour évaluer les performances du système. Les résultats sont prometteurs, à la fois en terme de vitesse de traitement et de performance de détection<br>This thesis has been carried out in the framework of the cooperation between the Compiègne University of Technology (UTC) and the Technical Centre for Mechanical Industries (CETIM). In this work, we present a vision-based multi-sensors people detection system for safety on heavy machines. A perception system composed of a monocular fisheye camera and a Lidar is proposed. The use of fisheye cameras provides an advantage of a wide field-of-view but yields the problem of handling the strong distortions in the detection stage.To the best of our knowledge, no research works have been dedicated to people detection in fisheye images. For that reason, we focus on investigating and quantifying the strong radial distortions impacts on people appearance and proposing adaptive approaches to handle that specificity. Our propositions are inspired by the two state-of-the-art people detection approaches : the Histogram of Oriented Gradient (HOG) and the Deformable Parts Model (DPM). First, by enriching the training data set, we prove that the classifier can take into account the distortions. However, fitting the training samples to the model, is not the best solution to handle the deformation of people appearance. We then decided to adapt the DPM approach to handle properly the problem. It turned out that the deformable models can be modified to be even better adapted to the strong distortions of the fisheye images. Still, such approach has adrawback of the high computation cost and complexity. In this thesis, we also present a framework that allows the fusion of the Lidar modality to enhance the vision-based people detection algorithm. A sequential Lidar-based fusion architecture is used, which addresses directly the problem of reducing the false detections and computation cost in vision-based-only system. A heavy machine dataset have been also built and different experiments have been carried out to evaluate the performances of the system. The results are promising, both in term of processing speed and performances
Books on the topic "Radial configuration"
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Billings, S. A. Radial basis function network configuration using genetic algorithms =: By S.A.Billings and G.L.Zheng. University of Sheffield, Dept. of Automatic Control and Systems Engineering, 1994.
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Billings, S. A. Radial basis function network configuration using mutual information and the orthogonal least squares algorithm. University of Sheffield, Dept. of Automatic Control and Systems Engineering, 1995.
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Evans, D. R. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. National Aeronautics and Space Administration, 1994.
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United States. National Aeronautics and Space Administration., ed. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. National Aeronautics and Space Administration, 1994.
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United States. National Aeronautics and Space Administration., ed. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. National Aeronautics and Space Administration, 1994.
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Shumljansky, I. I. Horn Radiators of Complex Configuration. World Scientific Publishing Co Pte Ltd, 1993.
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Shumljansky, I. I. Horn Radiators of Complex Configuration. World Scientific Publishing Co Pte Ltd, 1993.
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Kukla, Rebecca. Mass Hysteria. The United States of America, 2005. https://doi.org/10.5040/9798881815967.
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In Mass Hysteria, Rebecca Kukla examines the present-day medical and cultural practices surrounding pregnancy, new motherhood, and infant feeding. In the late-eighteenth century, the configuration of the maternal body underwent a radical transformation and the two maternal bodies that emerged out of this transformation still govern our imagination and rituals surrounding pregnancy and lactation. Exploring the history and the current life of these two maternal bodies within medical institutions, popular culture, and politics, Kukla offers a critical assessment of the lived repercussions of these ideological figures and practices for contemporary women's and infants' health and well-being.
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Isoaho, Karoliina, Alexandra Goritz, and Nicolai Schulz. Governing Clean Energy Transitions in China and India. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198802242.003.0012.
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China and India will have to radically transform their electric power systems in order to decouple economic growth from unsustainable resource consumption. The development and deployment of renewable energies offers a solution to this challenge. A clean energy transition, however, requires radical changes in the energy system that can only occur if a governing coalition is both willing and able to implement successful RET (renewable energy technology) policies. The authors analyse how this willingness and ability is shaped by the coalition’s power and cohesiveness, societal pressures, and the institutional configuration across levels of governance. In doing so, central drivers are identified and barriers to a clean energy transition in China and India.
Book chapters on the topic "Radial configuration"
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Xie, Jiaqiang, and Wei Kuang. "Simulation of the Mixing Performance of an Optimized Air Injector." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_99.
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Abstract The trim air system is an important system for realizing the temperature control of the flight deck and passenger cabin of commercial aircraft. The trim air duct is designed to bleed the high-temperature air to mix the cold air from the upstream of the refrigeration components in order to satisfy the independent temperature requirements of each area of the flight deck and passenger cabin. If the cold air and hot air mixing situation was poor, downstream temperature sensor layout location there is still a more serious hot and cold air stratification, the measured value is more difficult to reflect the average temperature of the mixed air, thus affecting the accuracy of the air conditioning system temperature regulation. In order to improve the mixing efficiency of the trim hot bleed air and ventilation air, this paper proposes an optimized trim air injector based on typical configuration, then models and calculates two configurations of the trim injector using three-dimensional simulation to obtain the fluid flow and temperature distribution characteristics under different conditions. In this paper, the MAX temperature difference, the Surface standard deviation of temperature, the Surface uniformity of temperature and other parameters are also utilized to model and calculate the air flow and temperature distribution characteristics of the two configurations of the trim injector. The mixing effects of the two trim injectors were analyzed and evaluated. The results show that, after optimization, the radial high-speed thermal jet can effectively improve the perturbation and mixing between the hot and cold fluids after the hot bleed air passes through the inflow nozzle; compared with the typical configuration, the optimized configuration has a lower maximum temperature difference of about 67% and a lower standard deviation of temperature of 71% in each cross-section. The surface temperature uniformity coefficient of the optimized configuration is closer to 1 in each cross-section, and the temperature stratification effect and mixing effect are better than that of the typical configuration.
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Jupić, Hajrudin, Tatjana Konjić, and Mia Lešić Aganović. "Optimal Configuration of the Radial Distribution Network Using Modified Genetic and Simulated Annealing Algorithms." In Lecture Notes in Networks and Systems. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-71694-2_54.
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Karamchandani, S. H., M. Panju, S. N. Merchant, U. B. Desai, G. D. Jindal, and D. G. Khairnar. "Parallel Support Vector Configuration for Identification of Fast Independent Components in Morphological Patterns Derived by Cardiovasographic Analysis on the Radial Pulse." In Neural Information Processing. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34481-7_69.
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Dixon, Robert C. "Receiver Configurations." In Radio Receiver Design. CRC Press, 2024. http://dx.doi.org/10.1201/9781003573500-3.
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Minkenberg, Michael. "Configurations: Mobilization and Performance." In The Radical Right in Eastern Europe. Palgrave Macmillan US, 2017. http://dx.doi.org/10.1057/978-1-137-56332-3_5.
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Minervini, Andrea, Andrea Mari, Gianni Vittori, Marco Carini, and Walter Artibani. "Radical Cystectomy: Abdominal District and Neobladder Configurations." In Anatomy for Urologic Surgeons in the Digital Era. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-59479-4_19.
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Colin-Koeniguer, E., N. Trouve, Y. Yamaguchi, et al. "Urban Applications." In Polarimetric Synthetic Aperture Radar. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-56504-6_5.
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AbstractThe experimental result reported in this chapter review the application of (high resolution) Synthetic Aperture Radar (SAR) data to extract valuable information for monitoring urban environments in space and time. Full polarimetry is particularly useful for classification, as it allows the detection of built-up areas and to discriminate among their different types exploiting the variation of the polarimetric backscatter with the orientation, shape, and distribution of buildings and houses, and street patterns. On the other hand, polarimetric SAR data acquired in interferometric configuration can be combined for 3-D rendering through coherence optimization techniques. If multiple baselines are available, direct tomographic imaging can be employed, and polarimetry both increases separation performance and characterizes the response of each scatterer. Finally, polarimetry finds also application in differential interferometry for subsidence monitoring, for instance, by improving both the number of resolution cells in which the estimate is reliable, and the quality of these estimates.
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Kumar, Ajay, Shelly Singla, and Deepak Kedia. "Generation and Comparison of Filterless Octuple RoF Upconversion Systems Based on Cascaded and Dual Parallel MZM Configuration." In Mobile Radio Communications and 5G Networks. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7982-8_43.
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Jonker, Jan, and Niels Faber. "Speaking of Transition." In Organizing for Sustainability. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78157-6_1.
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AbstractWe are confronted with increasingly pressing questions about economic and social transition. Things have to change, but how? We believe that this change is concerned with three closely related challenges, which we call the triple transition—climate, energy, and circularity. These challenges combined result in a call for radical and major changes in the configuration of our economies and for the reconsideration and redesign of our systems. The fact remains that we live in organized societies and economies in which together we need to shape these transitions. Central to this book stands the premise that transition requires new forms of value creation materialized in the new generation of sustainable and circular business models. To make this possible the Business Model Template (BMT) was developed. The purpose of this chapter is to introduce you to the structure and style of this book and how the BMT is presented in the various chapters.
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Vijeta, Shibu Saha, V. K. Jaiswal, and Parag Sharma. "Realization of Total Spectral Radiant Flux of an Incandescent Lamp with Three Spectroradiometer Configurations." In Recent Advances in Metrology. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4594-8_20.
Full textConference papers on the topic "Radial configuration"
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SA, ChithraDevi, I. Mahendravarman, A. Ragavendiran, M. Muthamizh Selvam, K. Yamuna, and Vibin R. "Optimal Configuration of Radial Distribution Networks with Stud Krill Herd Optimization." In 2024 International Conference on Signal Processing, Computation, Electronics, Power and Telecommunication (IConSCEPT). IEEE, 2024. http://dx.doi.org/10.1109/iconscept61884.2024.10627797.
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Ma, Zhanhua, Dexin Wang, San-Mou Jeng, and Michael A. Benjamin. "Flow Structures of a Radial-Inlet Swirler." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0120.
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The upstream and downstream flows of a radial inlet swirler were investigated by using a 2-D Laser Doppler Velocimetry (LDV) probe. The radial profiles of axial and tangential velocities at various axial locations were obtained. The effects of Reynolds Number, swirler exit configuration and combustor outlet condition were examined. The results reveal that the combustor outlet condition has strong influence on the downstream flow field of the swirler. The effect of Reynolds Number depends on the swirler exit configurations. The influence of the convergent configuration from swirl chamber to orifice on the flow fields is very small whereas the influence of the divergence at the swirler exit is significant. The upstream and downstream flows of the radial inlet swirler are of sub-critical nature, thus the swirler exit configuration and combustor outlet condition significantly affect the flow fields.
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Szumilas, Lech, Rene Donner, Georg Langs, and Allan Hanbury. "Local Structure Detection with Orientation-invariant Radial Configuration." In 2007 IEEE Conference on Computer Vision and Pattern Recognition. IEEE, 2007. http://dx.doi.org/10.1109/cvpr.2007.383126.
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Perez-Raya, Isaac, Abel Hernandez-Guerrero, Daniel Juarez-Robles, M. Ernesto Gutierrez-Rivera, and J. C. Rubio-Arana. "New Radial-Based Flow Configurations for PEMFCs." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12202.
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This work presents the results of a study of a new radial configuration proposed for the gas flow field for a PEM fuel cell. The objective of this study is to understand the effects of this configuration on the fuel cell performance. The results are compared with the radial designs proposed in previous analysis. The proposed designs on this work show an improvement on the cell performance, with a better use of the reaction area compared with a flow free radial design. The results also show that the effect of channeling the flow inside these radial configurations helps to improve the fuel cell performance.
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Lin, Sheng-Chieh, Xionghui Wang, Wessam Estefanos, Samir Tambe, and San-Mou Jeng. "The Effect of the Geometric Modifications of the Venturi on the Non-Reactive Flow and Combustion Behavior Using a Counter-Rotating Radial-Radial Swirler." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64876.
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An experimental study was conducted to perform an analysis of the effect of the geometric modifications of the venturi on the non-reactive and reactive flow behavior using a counter-rotating radial-radial swirler. In the non-reactive flow tests, measurements were taken in a central vertical plane and horizontal (cross-sectional) plane at the exit of the swirler, using a High-Speed, Two Dimensional, Particle Image Velocimetry (2D PIV) system. The size of the swirler used in the non-reactive flow tests is a 4.76X scaled size of the swirler used in combustion. The 4.76X swirler models were tested in air flow seeded with olive oil at Re = 51,500, corresponding to the pressure drop across the 1X swirler models of 4% of atmospheric pressure at ambient conditions. Compared with the 1X swirler models, the 4.76X swirler models provide high spatial and temporal resolutions from the enhanced visibility of the flow characteristics and lower velocities at the same Re. Four swirler configurations of high swirl number (SN ≈ 1.0) were used, with no modification for the baseline configuration (configuration 1), and with the chevrons on the venturi for the straight chevrons configuration (configuration 2). The design of the inclined venturi was used for the converging venturi configuration (configuration 3), and chevrons were added on the converging venturi for the converging chevrons configuration (configuration 4). In the combustion tests, the 1X swirler models were tested using 478K preheated air at 4% pressure drop across the swirler, and different chamber lengths. Measurements were conducted using a regular camera to capture the flame image, and dynamic pressure transducers to obtain the acoustic pressure oscillations. Four configurations were studied and compared in the non-reactive and reactive flows with the objective of understanding the mechanisms responsible in reducing the extent of the combustion instabilities. Results of this study show that the converging venturi in configuration 3 appears to be the best design in eliminating the combustion instabilities in the fuel-lean region as compared to the other configurations. This indicates that the prevention of the frequencies coupling between the heat release rate and acoustic oscillations has been achieved by using the design of the converging venturi.
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Bay, Ayşe, Fırat Kıyıcı, and Mustafa Perçin. "Effect of Flare Geometry on the Flow Field of Radial-Radial Swirlers." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83234.
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Abstract In this study, an experimental investigation is conducted to assess the impact of the flare geometry on the mean flow field generated by radial-radial swirlers. Two-dimensional two-component PIV measurements are performed on the mid-plane of a non-reacting planar combustor test section. Three-dimensional numerical simulations are conducted for selected cases to support experimental observations. In a previous study conducted in the same setup, counter-rotating radial-radial swirlers without flare extension were investigated. In this study, in addition to the previously studied baseline swirler geometry, four different swirlers are investigated with three different flare geometries (a rounded flare geometry with a radius of 4 mm and two chamfered flares at angles of 27.5° and 45°) with the rounded one having both co- and counter-rotating configurations. Analysis of the time-averaged flow fields reveals that there is an increase in radial velocity values and a decrease in axial velocity values as a result of the introduction of the flare geometry, which results in a sudden expansion of the swirling jet. When different flare geometries are compared, almost identical flow fields are observed and the formation of a CRZ is not observed for any geometry that employs a flare geometry. Although the maximum negative axial velocity values decrease for geometries with flare, due to the increase of the recirculation radius, the recirculating mass flow rate is higher than the baseline swirler. On the other hand, the recirculating mass flow rate is higher in the co-rotating swirler configuration due to stronger adverse pressure gradient along the central axis of the jet when compared to counter-rotating configuration. Coherent flow structures are identified by using the snapshot POD method and different mode shapes obtained for swirlers with and without flare geometry are reported. It is shown that the change of the sense of rotation and flare geometry does not bring about any differences in the POD modes and their energy contents for the given swirl number and confinement conditions.
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Lin, Sheng-Chieh, Wessam Estefanos, James Brennan, Samir Tambe, and San-Mou Jeng. "The Effect of Chevrons on the Primary and Secondary Swirlers on the Dynamic Behavior of the Flow Generated by a Counter-Rotating Radial-Radial Swirler." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56622.
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An experimental investigation was conducted to study the effect of chevrons on the dynamic behavior of the swirling flow generated by a counter-rotating radial-radial swirler. 3X models of a low swirl number swirler (SN ≈ 0.6) were used to achieve lower velocities for the same Reynolds number (Re) and enhanced visibility of the flow characteristics by enabling high spatial and temporal resolutions. Three swirler configurations were used, including the baseline with no chevrons. Configuration 2 features chevrons on the trailing edge of the primary swirler, and configuration 3 has chevrons on the trailing edge of both primary and secondary swirlers. The swirlers were tested in water flow at Reynolds number (Re) = 51,500 which corresponds to the typical operational pressure drop of 4% of atmospheric pressure for the corresponding 1X model of the swirler at ambient conditions. Water testing was used since it allows additional slowing down of the flow dynamic features so that they can be captured and analyzed. Measurements were conducted in a vertical plane passing through the swirler centerline, and two horizontal (cross-sectional) planes using a High-Speed, Two Dimensional, Particle Image Velocimetry (2D PIV) system to obtain the mean, turbulent and dynamic behavior of the flow. Results of this study introduce the concept of chevrons on swirlers as a promising approach to change the flow dynamic behavior and thus, affect combustion dynamics. The results show that the presence of chevrons break down the region of high modal energy into several smaller regions. However, configuration 2 has few regions of the highest modal energy among the configurations, whereas the modal energy values for configurations 3 has the lowest magnitudes. Thus, the secondary chevrons in configuration 3 play an important role to eliminate these high-energy local spots as well as meet the requirement to break down the large scale structures.
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SUZUKI, HIROMI. "WIGGLY STRINGS OF RADIAL CONFIGURATION IN THE KERR BLACK HOLE." In Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0186.
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Kazakov, Vladimir A., and Daniel Rodriguez. "Sampling in the radial configuration with jitter of Gaussian Fields." In AFRICON 2007. IEEE, 2007. http://dx.doi.org/10.1109/afrcon.2007.4401465.
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Viana, Enio Rodrigues, Aldir Silva Sousa, and Ricardo de Andrade Lira Rabelo. "Generation of Non-Isolated Radial Configuration in Distributed Power Systems." In 2021 6th International Conference on Smart and Sustainable Technologies (SpliTech). IEEE, 2021. http://dx.doi.org/10.23919/splitech52315.2021.9566424.
Full textReports on the topic "Radial configuration"
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Liu, Peng, Kyehwan Lee, Fernando J. Cintrón, et al. Blueprint for deploying 5G O-RAN testbeds :. National Institute of Standards and Technology (U.S.), 2024. https://doi.org/10.6028/nist.ir.2311.
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This documentation serves as a blueprint for new researchers, offering a comprehensive guide on establishing an Open Radio Access Network (O-RAN) testbed from scratch. It details the O-RAN architecture and the supporting software stacks required for each component, and provides both aggregated and disaggregated deployment scenarios tested on our testbeds. The guide provides thorough installation instructions for each software stack we tested. In addition, a testbed example of a disaggregated scenario is used to demonstrate proper configurations and practical operations to test the connection and interoperation between the deployed O-RAN components. Moreover, this documentation introduces our innovative automation tool, designed to streamline the installation and configuration of some O-RAN components, ensuring a more efficient deployment process. This publication aims to equip researchers with the foundational knowledge and practical steps needed to initiate and manage their own O-RAN testbeds effectively.
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Cheng, D., J. Korhonen, M. Boucadair, and S. Sivakumar. RADIUS Extensions for IP Port Configuration and Reporting. RFC Editor, 2017. http://dx.doi.org/10.17487/rfc8045.
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Weingart, Troy B., Douglas C. Sicker, and Dirk Grunwald. A Method for Dynamic Configuration of a Cognitive Radio. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada452141.
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Tang, C. M., P. Sprangle, A. Ting, and B. Hafizi. Radio Frequency Linac Driven Free-Electron Laser Configurations. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada212572.
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Charbonneau, F. Compact polarimetric equations under backward scattering alignment convention. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331496.
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Inconsistencies in scientific literature related to radar compact polarimetry (CP) has raised issues in analysis tool development and in derived results comparison. These inconsistencies primarily result from confusion between the Forward Scattering Alignment (FSA) and the Backward Scattering Alignment (BSA) conventions. This can lead to the misinterpretation of results when the circular direction of rotation of the transmitted signal is not properly considered. This technical note summarizes and demonstrates the relationships between coherently received wave under a linear or a circular configuration for right circular transmitted signals under the BSA convention. As well, it defines the received Stokes vector, for right circular transmitted signals, in terms of a linear or a circular receiving bases and in terms of fully polarimetric data.
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Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from Composition B mortar rounds. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45260.
Full textAbstract:
Empirical measurements of the spatial distribution, particle-size distribution, mass, morphology, and energetic composition of particles from low-order (LO) detonations are critical to accurately characterizing environ-mental impacts on military training ranges. This study demonstrated a method of generating and characterizing LO-detonation particles, previously applied to insensitive munitions, to 81 mm mortar rounds containing the conventional explosive formulation Composition B. The three sampled rounds had estimated detonation efficiencies ranging from 64% to 82% as measured by sampled residual energetic material. For all sampled rounds, energetic deposition rates were highest closer to the point of detonation; however, the mass per radial meter varied. The majority of particles (>60%), by mass, were <2 mm in size. However, the spatial distribution of the <2 mm particles from the point of detonation varied be-tween the three sampled rounds. In addition to the particle-size-distribution results, several method performance observations were made, including command-detonation configurations, sampling quality control, particle-shape influence on laser-diffraction particle-size analysis (LD-PSA), and energetic purity trends. Overall, this study demonstrated the successful characterization of Composition B LO-detonation particles from command detonation through combined analysis by LD-PSA and sieving.
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Fernandez, Ruben, Hernando Lugo, and Georfe Dulikravich. Aerodynamic Shape Multi-Objective Optimization for SAE Aero Design Competition Aircraft. Florida International University, 2021. http://dx.doi.org/10.25148/mmeurs.009778.
Full textAbstract:
The SAE Regular Class Aero Design Competition requires students to design a radio-controlled aircraft with limits to the aircraft power consumption, take-off distance, and wingspan, while maximizing the amount of payload it can carry. As a result, the aircraft should be designed subject to these simultaneous and contradicting objectives: 1) minimize the aerodynamic drag force, 2) minimize the aerodynamic pitching moment, and 3) maximize the aerodynamic lift force. In this study, we optimized the geometric design variables of a biplane configuration using 3D aerodynamic analysis using the ANSYS Fluent. Coefficients of lift, drag, and pitching moment were determined from the completed 3D CFD simulations. Extracted coefficients were used in modeFRONTIER multi-objective optimization software to find a set of non-dominated (Pareto-optimal or best trade-off) optimized 3D aircraft shapes from which the winner was selected based to the desired plane performance.
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Droms, R., and J. Schnizlein. Remote Authentication Dial-In User Service (RADIUS) Attributes Suboption for the Dynamic Host Configuration Protocol (DHCP) Relay Agent Information Option. RFC Editor, 2005. http://dx.doi.org/10.17487/rfc4014.
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Martin, Torge. Runoff remapping for ocean model forcing. GEOMAR Helmholtz Centre for Ocean Research Kiel, 2021. http://dx.doi.org/10.3289/sw_2_2021.
Full textAbstract:
A Pyhton-based toolbox to remap daily runoff fields of the JRA55-do reanalysis (Tsujino et al., 2018, https://doi.org/10.1016/j.ocemod.2018.07.002) onto any ocean model grid. Runoff from the original global JRA grid is collected and redistributed to a given model coastline. A particular feature is the optional treatment of river mouths: runoff from grid nodes, which is of exceptionally large magnitude after the basic remapping, can be radially spread to ocean nodes farther offshore. The scripts were tested successfully for NEMO ocean model configurations of various resolution (global grids ORCA025 and ORC05 as well as regional nests VIKING10, ORION10, VIKING20X and INALT20X) at GEOMAR, Kiel (see Biastoch et al., 2021, https://doi.org/10.5194/os-2021-37 for an application). General instructions are provided for how to process the original JRA runoff files and also for the optional river mouth treatment. The technique is illustrated by examples of the fragmented coast of Greenland and the Amazon river mouth. While the code is versatile, examples are given for an application with the NEMO ocean model.
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Tyson, Paul. Sovereignty and Biosecurity: Can we prevent ius from disappearing into dominium? Mέta | Centre for Postcapitalist Civilisation, 2021. http://dx.doi.org/10.55405/mwp3en.
Full textAbstract:
Drawing on Milbank and Agamben, a politico-juridical anthropology matrix can be drawn describing the relations between ius and bios (justice and political life) on the one hand and dominium and zoe (private power and ‘bare life’) on the other hand. Mapping movements in the basic configurations of this matrix over the long sweep of Western cultural history enable us to see where we are currently situated in relation to the nexus between politico-juridical authority (sovereignty) and the emergency use of executive State powers in the context of biosecurity. The argument presented is that pre-19th century understandings of ius and bios presupposed transcendent categories of Justice and the Common Good that were not naturalistically defined. The very recent idea of a purely naturalistic naturalism has made distinctions between bios and zoe un-locatable and civic ius is now disappearing into a strangely ‘private’ total power (dominium) over the bodies of citizens, as exercised by the State. The very meaning of politico-juridical authority and the sovereignty of the State is undergoing radical change when viewed from a long perspective. This paper suggests that the ancient distinction between power and authority is becoming meaningless, and that this loss erodes the ideas of justice and political life in the Western tradition. Early modern capitalism still retained at least the theory of a Providential moral order, but since the late 19th century, morality has become fully naturalized and secularized, such that what moral categories Classical economics had have been radically instrumentalized since. In the postcapitalist neoliberal world order, no high horizon of just power –no spiritual conception of sovereignty– remains. The paper argues that the reduction of authority to power, which flows from the absence of any traditional conception of sovereignty, is happening with particular ease in Australia, and that in Australia it is only the Indigenous attempt to have their prior sovereignty –as a spiritual reality– recognized that is pushing back against the collapse of political authority into mere executive power.