Academic literature on the topic 'Rod box'
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Journal articles on the topic "Rod box"
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Parham, Peter. "The box and the rod." Nature 357, no. 6379 (June 1992): 538–39. http://dx.doi.org/10.1038/357538a0.
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Johnson, Scott P., and Richard N. Aslin. "Young Infants' Perception of Illusory Contours in Dynamic Displays." Perception 27, no. 3 (March 1998): 341–53. http://dx.doi.org/10.1068/p270341.
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Ninety-six 4-month-old infants were habituated to one of three computer-generated displays depicting two rod parts above and below an occluding box. In the first display, the surfaces and boundaries of the rod and box were specified by dense surface texture. Their depth segregation was specified by accretion and deletion of background texture and motion shear. In the second display, the unity of the rod parts and box, and their depth segregation, were specified only by illusory contours. In the third display, the boundaries of the rod and box were specified by illusory contours, perceptible only via spatiotemporal integration of accretion and deletion of sparse-background-texture elements. Infants appeared to perceive object unity, and segregate the rod and box surfaces, in all three displays, indicating use of illusory contours to perceive bounded surfaces in depth. The results suggest a cognitive contribution to perception of some illusory contours, abilities which seem to be present by at least 4 months of age.
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Cai, Shunyao, Weizhen Chen, and Jun Xu. "Full-scale fatigue tests on a novel box-shaped steel rod of a spatial arch bridge for fatigue assessment." Advances in Structural Engineering 21, no. 5 (August 23, 2017): 694–706. http://dx.doi.org/10.1177/1369433217726897.
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A novel leaning-type spatial arch bridge without thrust was designed as a landmark in a major urban city. In order to alleviate the higher negative reaction force at side span and enhance the lateral stability, commonly the case within this type bridge, a large-size replaceable box-shaped steel rod with pinned connections was introduced. The fatigue behaviour of the box-shaped steel rod and related upper and lower anchorage segments was investigated through a full-scale constant-amplitude fatigue test under axial loading. In comparison to the fatigue test results, the fatigue evaluation based on Eurocode 3 nominal stress design curve FAT56 considerably overestimated the fatigue strength of critical welded detail in box-shaped steel rod, which was underrated according to the universal International Institute of Welding effective notch stress design curve FAT225. The presented full-scale programme also validated the applicability of the latter method, which presented conservative results, to large-size thick-plate (80 mm) welded joints. The conclusion based on the test and theoretical results may provide a reference for the fatigue design of adopting box-shaped steel rod in spatial arch bridges.
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Santen, Edward R. "Flexible Shut-off Rod Used on Crooked Valve Box." Opflow 11, no. 9 (September 1985): 3. http://dx.doi.org/10.1002/j.1551-8701.1985.tb00416.x.
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Zhou, Chun Li, and Qian Zhang. "Study on Bend Performence of Binding Bars Prestressed Steel Box Concrete Beam." Applied Mechanics and Materials 351-352 (August 2013): 990–97. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.990.
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Put forward binding bars prestressed concrete filled steel box girder and analyses it’s advantage, Study on the bending moment by the fiber model method to analyze the beam-Curvature and load-Relation curves of deflection theory.Through the finite element software analysis of prestressed concrete steel box beam prestressed concrete filled steel tubes and four ways to set binding bars the ultimate bearing capacity of the beam,Analysis of the influence of the thickness of the steel plate and rod diameter, constraint, constraint rod axial spacing on various beam flexural capacity.The results show that,Binding bar has more advantages for prestressed concrete steel box using a thin plate bending ability improvement,Diameter, spacing of the binding bars binding bars as long as not bending capacity of prestressed concrete with binding bars of steel box beam structure under the condition of impact.
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Li, Rui, Xianghui Meng, and Youbai Xie. "A tribological analysis on stuffing box-piston rod system of low-speed marine diesel engines." International Journal of Engine Research 20, no. 8-9 (August 31, 2018): 911–30. http://dx.doi.org/10.1177/1468087418796615.
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The stuffing box-piston rod system is widely used in the low-speed marine diesel engines to scrape oil and ensure sealing. Its friction power loss and wear rate are great, but the studies about the system are very limited. In this study, based on the special structure and working conditions of the stuffing box, the analytical model for the tribological properties of the stuffing box-piston rod system is developed considering the oil starvation and relative ring location effects. The minimum oil film thickness, friction, oil transportation, and asperity contact are calculated for the stuffing box. The analysis results show that compared with the fully flooded lubrication, the minimum oil film thicknesses of the rings reduce significantly in the middle of the strokes under the starved lubrication condition, but the friction losses of the rings are influenced by the comprehensive effects of the oil film thickness reduction and lubricating area reduction under the starved lubrication condition, which is related to the specific profiles of the rings. In addition, compared with the engine piston ring pack, the relative ring location effect is more obvious in the stuffing box ring pack because there are more rings and the ring intervals are larger. The relative ring location effect makes the minimum oil film thicknesses, friction forces, and asperity contacts of the rings have oscillations after bottom dead center and top dead center.
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Kavšek, Michael. "Infant perception of object unity in static displays." International Journal of Behavioral Development 28, no. 6 (November 2004): 538–45. http://dx.doi.org/10.1080/01650250444000252.
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The present study examined infants’ capability of extracting object unity in a stationary twodimensional rod-and-box display. The infants were habituated to a centre-occluded rod and were afterwards tested with both a broken rod and a complete rod. The looking pattern of both female and male participants aged 8 months did not reveal the ability to amodally complete the partly hidden rod. Nine-month-old females, however, looked reliably longer at the broken test stimulus than at the solid test display, implying that they had perceived the partially occluded rod presented in the habituation period as a connected whole. Their male counterparts, on the other hand, did not differentiate between the test patterns. These findings suggest that the capability of perceiving object unity in displays in which the relative depth ordering of surfaces is specified solely by the pictorial depth cue of interposition emerges after about 8 months of age. Furthermore, the results argue for a differential perspective including sex as a moderator variable.
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Liu, Heng Li, and Ming Qiao Zhou. "The Application of Folding Structure in the Draw-Bar Box Design." Applied Mechanics and Materials 709 (December 2014): 526–29. http://dx.doi.org/10.4028/www.scientific.net/amm.709.526.
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Based on the full analysis of draw-bar box types and functions, and summarizes the occupying larger space question of the box when placed in. Through the studies of the wide application of folding structure in the product, for a particular user, carries on the structure improvement design of rod boxes, not only to retain the existing functions commonly used, while achieving clothing classification, convenient placement, save space; embodies the idea connotation of green design, and highlights the importance of structure design for product innovation design.
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Zhai, Guangming, Yuwei Wang, Liu Liu, and Pan Guo. "Force Analysis of Supporting System during Form-Work Construction of Box Culvert without Tie Rod." Journal of Physics: Conference Series 2148, no. 1 (January 1, 2022): 012040. http://dx.doi.org/10.1088/1742-6596/2148/1/012040.
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Abstract In the construction process of box culvert form-work without tie rod, the stress state of its supporting system is of great importance. Based on a construction project for the box culvert without tie rod form-work, this paper studied the force characteristics of diagonal braces during the concrete pouring of the box culvert. The force calculation theory of the support system was analyzed and the force was analyzed using the finite element software Midas Civil. The results showed that when the distance between the connection point of the diagonal brace and the foundation was 1 m, the diagonal brace cannot provide effective support for the template, and when the distance between the connection point of the diagonal brace and the template is 2 m, 3 m, and 4 m, the diagonal brace can provide effective support. It was recommended that the diagonal brace connection point is 3 m away from the template as the optimal diagonal brace layout position. It is recommended to strengthen the area of increased local deformation of diagonal braces to a certain extent according to the calculation results of this finite element analysis to improve the safety performance of the entire structure. The research results of this paper can provide reference for follow-up similar construction problems.
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Jayakumar, K. R., and A. T. Eswara. "The Laminar Boundary Layer on a Moving Cylindrical Rod with an Applied Magnetic Field." Applied Mechanics and Materials 110-116 (October 2011): 936–39. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.936.
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The steady, nonsimilar MHD boundary layer flow over a moving cylindrical rod has been investigated. The nonlinear coupled partial differential equations governing the flow have been solved numerically using the Kellar box method. The results indicate that the magnetic field enhances the skin friction coefficient, while it reduces the velocity profile.
Dissertations / Theses on the topic "Rod box"
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Більченко, Олександр Сергійович. "Розроблення технологічного процесу виготовлення виливка «Упор», організація та планування сумішоприготувального відділення ливарного цеху." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34812.
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Дипломний проект: 91 стор., 36 табл., 7 рис., 8 посилань.
Об'єкт проектування – Розроблення технологічного процесу виготовлення виливка «Упор», організація та планування сумішоприготувального відділення ливарного цеху.
Предмет проектування – технологія ливарної форми та організація роботи сумішоприготувального відділення.
Результати проектування – розроблено технологію ливарної форми, виконано технічне планування сумішоприготувального відділення та розрахунок ливарного устаткування.
Результати проектування можуть бути рекомендовані: для впровадження при виробництві виливка масою до 350 кг, середньої складності в умовах серійного виробництва.
Галузь використання – машинобудування, приладобудування, комплекс тощо.Diploma project: 91 pages, 36 tables, 7 figures, 8 references. Object of design - Development of technological process of casting "Emphasis", organization and planning of the mixture preparation department of the foundry. The subject of design is the technology of the casting mold and the organization of the mixture preparation department. The results of the design - the technology of the mold is developed, the technical planning of the mixture preparation department and the calculation of the foundry equipment are performed. The design results can be recommended: for implementation in the production of castings weighing up to 350 kg, medium complexity in terms of mass production. Field of use - mechanical engineering, instrument making, complex, etc.
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Sletmo, Patrik. "Introducing probabilities within grey-box fuzzing." Thesis, Linköpings universitet, Databas och informationsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-161893.
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Over the recent years, the software industry has faced a steady increase in the number of exposed and exploited software vulnerabilities. With more software and devices being connected to the internet every day, the need for proactive security measures has never been more important. One promising new technology for making software more secure is fuzz testing. This automated testing technique is based around generating a large number of test cases with the intention of revealing dangerous bugs and vulnerabilities. In this thesis work, a new direction within grey-box fuzz testing is evaluated against previous work. The presented approach uses sampled probability data in order to guide the fuzz testing towards program states that are expected to be easy to reach and beneficial for the discovery of software vulnerabilities. Evaluation of the design shows that the suggested approach provides no obvious advantage over existing solutions, but also indicates that the performance advantage could be dependent on the structure of the system under test. However, analysis of the design itself highlights several design decisions that could benefit from more extensive research. While the design proposed in this thesis work is insufficient for replacing current state of the art fuzz testing software, it provides a solid foundation for future research within the field. With the many insights gained from the design and implementation work, this thesis work aims to both inspire others and showcase the challenges of creating a probability-based approach to grey-box fuzz testing.
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Дегерменджі, Анастасія Всеволодівна. "Ливарний комплекс АТ ”Полтавський турбомеханічний завод” з розробкою технології лиття." Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/26676.
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Об’єкт проектування – чавуноливарний цех з розробленням технологічних процесів виготовлення виливків різної маси литтям у разові піщано-глинясті форми.
Метою проекту є визначення технологічних параметрів та складання опису виробництва виливка; розроблення і обґрунтування етапів приготування рідкого сплаву; технологічне планування і проектування ливарного цеху.
Розроблений технологічний процес виготовлення виливка може бути рекомендований як типовий при виробництві чавуних виливків середньої складності в умовах дрібносерійного і великосерійного виробництва.
Попередніми розрахунками економічних показників прийнятих проектних рішень установлено економічну доцільність використання запропонованих процесів.
Розроблено організаційну схему роботи ливарного цеху та заходи, спрямовані на усунення небезпечних та шкідливих чинників.The design object is an iron foundry with the development of technological processes for the production of castings of various masses by casting into one-off sand-clay forms. The aim of the project is to determine the technological parameters and compile a description of the production of the casting; development and justification of the stage of preparation of the liquid alloy; technological planning and design of a foundry. The technological process of casting manufacturing has been developed can be recommended as typical for the production of iron castings of medium complexity in small-scale and large-scale production. Preliminary calculations of the economic indicators of the adopted design decisions established the economic feasibility of using the proposed processes. An organizational chart of the foundry’s work and measures aimed at eliminating dangerous and harmful factors have been developed.
Объект проектирования - чугунолитейный цех с разработкой технологических процессов изготовления отливок различной массы литьем в разовые песчано-глинистые формы. Целью проекта является определение технологических параметров и составления описания производства отливки; разработка и обоснование этапе приготовлении жидкого сплава; технологическое планирование и проектирование литейного цеха. Разработан технологический процесс изготовления отливки может быть рекомендован как типичный при производстве чугунных отливок средней сложности в условиях мелкосерийного и крупносерийного производства. Предварительным расчетам экономических показателей принятых проектных решений установлено экономическую целесообразность использования предложенных процессов. Разработана организационная схема работы литейного цеха и меры, направленные на устранение опасных и вредных факторов.
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Nordlander, Joakim. "Utvärdering av dimensionell stabilitet i PWR-patroner i Ringhals." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256948.
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Dimensional stability is an important aspect of fuel mechanical design and licensing of new fuel designs for nuclear power plants. Dimensional changes within the reactor can affect the safety margins against overheating of the cladding and the pellets, therefore it is crucial that the dimensional changes are kept to a minimum. The profits per produced kiloWatt hour continue to decrease for the Swedish nuclear power plants. Some reactors are even operated with a calculated loss. To reduce fuel costs and thereby improve the profit some reactors are operated with higher uranium enrichment, so that the assemblies can reach a higher average burnup. This increases the neutron fluence to the pellets, cladding an spacers. Fluence is the parameter that most strongly affects dimensional changes within the reactor. This master thesis was carried out at Vattenfall Nuclear Fuel in Solna during 2015. The purpose of this study is to evaluate the different dimensional changes in the fuel designs operating in Ringhals 2 ,3 and 4. The gained results may improve possibilities to verify if fuel assemblies with observed rod bow are safe for continued operation. Inspection videos called visual inspections and 4-camera videos are captured each year in each of the three reactors. From these videos the distance to the top- and bottom plate was measured as well as the magnitude of the rod bow. The results show that Ringhals 2 fuel designs R2L2b and R2L1 make it possible for rod growth through the uppermost grid. This has been achieved by lesser grid spring force and at the present burnup no severe rod bow is observed for either of the fuel designs. In Ringhals 3 and 4 the fuel designs R34L1 and R34L2 show similar trends in rod growth and have the same magnitude of rod bow though it appears in different spans in the assembly. A comparison of the major rod-to-rod gaps and the adjacent rods axial growth has led to the conclusion that rod bow is driven by manufacturing differences within the rods and spacers.
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García, Segura Tatiana. "Efficient design of post-tensioned concrete box-girder road bridges based on sustainable multi-objective criteria." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/73147.
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[EN] Bridges, as an important component of infrastructure, are expected to meet all the requirements for a modern society. Traditionally, the primary aim in bridge design has been to achieve the lowest cost while guaranteeing the structural efficiency. However, concerns regarding building a more sustainable future have change the priorities of society. Ecological and durable structures are increasingly demanded. Under these premises, heuristic optimization methods provide an effective alternative to structural designs based on experience. The emergence of new materials, structural designs and sustainable criteria motivate the need to create a methodology for the automatic and accurate design of a real post-tensioned concrete bridge that considers all these aspects. For the first time, this thesis studies the efficient design of post-tensioned concrete box-girder road bridges from a sustainable point of view. This research integrates environmental, safety and durability criteria into the optimum design of the bridge. The methodology proposed provides multiple trade-off solutions that hardly increase the cost and achieve improved safety and durability. Likewise, this approach quantifies the sustainable criteria in economic terms, and evaluates the effect of these criteria on the best values of the variables.
In this context, a multi-objective optimization is formulated to provide multiple trade-off and high-performing solutions that balance economic, ecologic and societal goals. An optimization design program selects the best geometry, concrete type, reinforcement and post-tensioning steel that meet the objectives selected. A three-span continuous box-girder road bridge located in a coastal region is selected for a case study. This approach provides vital knowledge about this type of bridge in the sustainable context. The life-cycle perspective has been included through a lifetime performance evaluation that models the bridge deterioration process due to chloride-induced corrosion. The economic, environmental and societal impacts of maintenance actions required to extend the service life are examined. Therefore, the proposed goals for an efficient design have been switch from initial stage to life-cycle consideration.
Faced with the large computational time of multi-objective optimization and finite-element analysis, artificial neural networks (ANNs) are integrated in the proposed methodology. ANNs are trained to predict the structural response based on the design variables, without the need to analyze the bridge response. The multi-objective optimization problem results in a set of trade-off solutions characterized by the presence of conflicting objectives. The final selection of preferred solutions is simplified by a decision-making technique. A rational technique converts a verbal pairwise comparison between criteria with a degree of uncertainty into numerical values that guarantee the consistency of judgments. This thesis gives a guide for the sustainable design of concrete structures. The use of the proposed approach leads to designs with lower life-cycle cost and emissions compared to general design approaches. Both bridge safety and durability can be improved with a little cost increment by choosing the correct design variables. In addition, this methodology is applicable to any type of structure and material.[ES] Los puentes, como parte importante de una infraestructura, se espera que reúnan todos los requisitos de una sociedad moderna. Tradicionalmente, el objetivo principal en el diseño de puentes ha sido lograr el menor coste mientras se garantiza la eficiencia estructural. Sin embargo, la preocupación por construir un futuro más sostenible ha provocado un cambio en las prioridades de la sociedad. Estructuras más ecológicas y duraderas son cada vez más demandadas. Bajo estas premisas, los métodos de optimización heurística proporcionan una alternativa eficaz a los diseños estructurales basados en la experiencia. La aparición de nuevos materiales, diseños estructurales y criterios sostenibles motivan la necesidad de crear una metodología para el diseño automático y preciso de un puente real de hormigón postesado que considere todos estos aspectos. Por primera vez, esta tesis estudia el diseño eficiente de puentes de hormigón postesado con sección en cajón desde un punto de vista sostenible. Esta investigación integra criterios ambientales, de seguridad estructural y durabilidad en el diseño óptimo del puente. La metodología propuesta proporciona múltiples soluciones que apenas encarecen el coste y mejoran la seguridad y durabilidad. Al mismo tiempo, se cuantifica el enfoque sostenible en términos económicos, y se evalúa el efecto que tienen dichos criterios en el valor óptimo de las variables. En este contexto, se formula una optimización multiobjetivo que proporciona soluciones eficientes y de compromiso entre los criterios económicos, ecológicos y sociales. Un programa de optimización del diseño selecciona la mejor combinación de geometría, tipo de hormigón, armadura y postesado que cumpla con los objetivos seleccionados. Se ha escogido como caso de estudio un puente continuo en cajón de tres vanos situado en la costa. Este método proporciona un mayor conocimiento sobre esta tipología de puentes desde un punto de vista sostenible. Se ha estudiado el ciclo de vida a través de la evaluación del deterioro estructural del puente debido al ataque por cloruros. Se examina el impacto económico, ambiental y social que produce el mantenimiento necesario para extender la vida útil del puente. Por lo tanto, los objetivos propuestos para un diseño eficiente han sido trasladados desde la etapa inicial hasta la consideración del ciclo de vida. Para solucionar el problema del elevado tiempo de cálculo debido a la optimización multiobjetivo y el análisis por elementos finitos, se han integrado redes neuronales en la metodología propuesta. Las redes neuronales son entrenadas para predecir la respuesta estructural a partir de las variables de diseño, sin la necesidad de analizar el puente. El problema de optimización multiobjetivo se traduce en un conjunto de soluciones de compromiso que representan objetivos contrapuestos. La selección final de las soluciones preferidas se simplifica mediante una técnica de toma de decisiones. Una técnica estructurada convierte los juicios basados en comparaciones por pares de elementos con un grado de incertidumbre en valores numéricos que garantizan la consistencia de dichos juicios. Esta tesis proporciona una guía que extiende y mejora las recomendaciones sobre el diseño de estructuras de hormigón dentro del contexto de desarrollo sostenible. El uso de la metodología propuesta lleva a diseños con menor coste y emisiones del ciclo de vida, comparado con diseños que siguen metodologías generales. Los resultados demuestran que mediante una correcta elección del valor de las variables se puede mejorar la seguridad y durabilidad del puente con un pequeño incremento del coste. Además, esta metodología es aplicable a cualquier tipo de estructura y material.
[CAT] Els ponts, com a part important d'una infraestructura, s'espera que reunisquen tots els requisits d'una societat moderna. Tradicionalment, l'objectiu principal en el disseny de ponts ha sigut aconseguir el menor cost mentres es garantix l'eficiència estructural. No obstant això, la preocupació per construir un futur més sostenible ha provocat un canvi en les prioritats de la societat. Estructures més ecològiques i durables són cada vegada més demandades. Davall estes premisses, els mètodes d'optimització heurística proporcionen una alternativa eficaç als dissenys estructurals basats en l'experiència. L'aparició de nous materials, dissenys estructurals i criteris sostenibles motiven la necessitat de crear una metodologia per al disseny automàtic i precís d'un pont real de formigó posttesat que considere tots estos aspectos. Per primera vegada, esta tesi estudia el disseny eficient de ponts de formigó posttesat amb secció en calaix des d'un punt de vista sostenible. Esta investigació integra criteris ambientals, de seguretat estructural i durabilitat en el disseny òptim del pont. La metodologia proposada proporciona múltiples solucions que a penes encarixen el cost i milloren la seguretat i durabilitat. Al mateix temps, es quantifica l'enfocament sostenible en termes econòmics, i s'avalua l'efecte que tenen els dits criteris en el valor òptim de les variables. En este context, es formula una optimització multiobjetivo que proporciona solucions eficients i de compromís entre els criteris econòmics, ecològics i socials. Un programa d'optimització del disseny selecciona la millor geometria, tipus de formigó, armadura i posttesat que complisquen amb els objectius seleccionats. S'ha triat com a cas d'estudi un pont continu en calaix de tres vans situat en la costa. Este mètode proporciona un major coneixement sobre esta tipologia de ponts des d'un punt de vista sostenible. S'ha estudiat el cicle de vida a través de l'avaluació del deteriorament estructural del pont a causa de l'atac per clorurs. S'examina l'impacte econòmic, ambiental i social que produïx el manteniment necessari per a estendre la vida útil del pont. Per tant, els objectius proposats per a un disseny eficient han sigut traslladats des de l'etapa inicial fins a la consideració del cicle de vida. Per a solucionar el problema de l'elevat temps de càlcul degut a l'optimització multiobjetivo i l'anàlisi per elements finits, s'han integrat xarxes neuronals en la metodologia proposada. Les xarxes neuronals són entrenades per a predir la resposta estructural a partir de les variables de disseny, sense la necessitat d'analitzar el pont. El problema d'optimització multiobjetivo es traduïx en un conjunt de solucions de compromís que representen objectius contraposats. La selecció final de les solucions preferides se simplifica per mitjà d'una tècnica de presa de decisions. Una tècnica estructurada convertix els juís basats en comparacions per parells d'elements amb un grau d'incertesa en valors numèrics que garantixen la consistència dels dits juís. Esta tesi proporciona una guia que estén i millora les recomanacions sobre el disseny d'estructures de formigó dins del context de desenrotllament sostenible. L'ús de la metodologia proposada porta a dissenys amb menor cost i emissions del cicle de vida, comparat amb dissenys que seguixen metodologies generals. Els resultats demostren que per mitjà d'una correcta elecció del valor de les variables es pot millorar la seguretat i durabilitat del pont amb un xicotet increment del cost. A més, esta metodologia és aplicable a qualsevol tipus d'estructura i material.
García Segura, T. (2016). Efficient design of post-tensioned concrete box-girder road bridges based on sustainable multi-objective criteria [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/73147
TESIS
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Giangiacomi, Nico. "Firmware development and testing for L1/L2 IBL upgrade." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9378/.
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Il lavoro di questa tesi riguarda principalmente l'upgrade, la simulazione e il test di schede VME chiamate ReadOut Driver (ROD), che sono parte della catena di elaborazione ed acquisizione dati di IBL (Insertable B-Layer). IBL è il nuovo componente del Pixel Detector dell'esperimento ATLAS al Cern che è stato inserito nel detector durante lo shut down di LHC; fino al 2012 infatti il Pixel Detector era costituito da tre layer, chiamati (partendo dal più interno): Barrel Layer 0, Layer 1 e Layer 2. Tuttavia, l'aumento di luminosità di LHC, l'invecchiamento dei pixel e la richiesta di avere misure sempre più precise, portarono alla necessità di migliorare il rivelatore. Così, a partire dall'inizio del 2013, IBL (che fino a quel momento era stato un progetto sviluppato e finanziato separatamente dal Pixel Detector) è diventato parte del Pixel Detector di ATLAS ed è stato installato tra la beam-pipe e il layer B0. Questa tesi fornirà innanzitutto una panoramica generale dell'esperimento ATLAS al CERN, includendo aspetti sia fisici sia tecnici, poi tratterà in dettaglio le varie parti del rivelatore, con particolare attenzione su Insertable B-Layer. Su quest'ultimo punto la tesi si focalizzerà sui motivi che ne hanno portato alla costruzione, sugli aspetti di design, sulle tecnologie utilizzate (volte a rendere nel miglior modo possibile compatibili IBL e il resto del Pixel Detector) e sulle scelte di sviluppo e fabbricazione. La tesi tratterà poi la catena di read-out dei dati, descrivendo le tecniche di interfacciamento con i chip di front-end, ed in particolare si concentrerà sul lavoro svolto per l'upgrade e lo sviluppo delle schede ReadOut Drivers (ROD) introducendo le migliorie da me apportate, volte a eliminare eventuali difetti, migliorare le prestazioni ed a predisporre il sistema ad una analisi prestazionale del rivelatore. Allo stato attuale le schede sono state prodotte e montate e sono già parte del sistema di acquisizione dati del Pixel Detector di ATLAS, ma il firmware è in continuo aggiornamento.
Il mio lavoro si è principalmente focalizzato sul debugging e il miglioramento delle schede ROD; in particolare ho aggiunto due features:
- programmazione parallela delle FPGA} delle ROD via VME. IBL richiede l'utilizzo di 15 schede ROD e programmandole tutte insieme (invece che una alla volta) porta ad un sensibile guadagno nei tempi di programmazione. Questo è utile soprattutto in fase di test;
- reset del Phase-Locked Loop (PLL)} tramite VME. Il PLL è un chip presente nelle ROD che distribuisce il clock a tutte le componenti della scheda. Avere la possibilità di resettare questo chip da remoto permette di risolvere problemi di sincronizzazione.
Le ReadOut Driver saranno inoltre utilizzate da più layer del Pixel Detector. Infatti oltre ad IBL anche i dati provenienti dai layer 1 e 2 dei sensori a pixel dell’esperimento ATLAS verranno acquisiti sfruttando la catena hardware progettata, realizzata e testata a Bologna.
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Marques, Francisca Helena. "Festa da Boa Morte e Glória: ritual, música e performance." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/8/8134/tde-19022010-174044/.
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Esse trabalho discute a performance ritual e musical durante a Festa da Boa Morte e Glória realizada anualmente na segunda quinzena de agosto na cidade de Cachoeira, Recôncavo da Bahia. Elaborada através de elementos simbólicos, culturais, religiosos e de resistência política e social, a Festa da Boa Morte compreende performances musicais dentro de uma complexa performance ritual que é ao mesmo tempo coletiva e absolutamente restritiva. A Irmandade de Nossa Senhora da Boa Morte é um coletivo de mulheres idosas, todas religiosas enquanto praticantes do candomblé e do catolicismo popular. Como grupo a Irmandade é considerada elite na luta e resistência do negro contra o sofrimento e a escravidão no Brasil. As irmãs foram e são mulheres diferenciadas em vários sentidos: aos olhos da sociedade colonial eram chamadas de negras do partido alto; miticamente transgressoras da ordem masculina são consideradas iamis e organizadas em sacerdócio religioso unindo diferentes nações são donas do axé ou eleyes. As irmãs antigas compraram as alforrias de outros sacerdotes e sacerdotisas africanos, se comprometeram em garantir funerais dignos a si mesmas e aos seus, e mantém uma festa associada aos seus antepassados femininos (eguns) e aos seus orixás durante rituais católicos públicos e do candomblé (secretos). Segundo as irmãs, elas cumprem uma promessa feita pelas mais antigas: se todos os escravos fossem libertos elas cultuariam Maria na vida e na morte. Personagens narrando e encenando repetidamente performances, as irmãs desenvolvem seqüências rituais e musicais que vão da anunciação da morte ao velório de Nossa Senhora no primeiro dia da Festa. No segundo dia é realizado o enterro, e, no terceiro, demonstram sua crença na vida após a morte através da glorificação e assunção de Maria aos céus. Esses são os três principais momentos do ritual público, aos quais se seguem outros três dias de samba de roda que se fundem aos rituais secretos, já em desenvolvimento antes da Festa. O encerramento é marcado pela entrega de um presente às águas, para os orixás femininos Nanã, Iemanjá e Oxum.This work discusses the musical and ritual performance during the Sisterhood of Good Death Celebration, which occurs in the second half of August in the city of Cachoeira, Recôncavo Area of Bahia. Involving symbolic, cultural, religious, social and political elements, the Sisterhood of Good Death Celebration engages musical performances inside a complex ritual performance that is at the same time collective and absolutely restrictive. The Sisterhood of Good Death is a collective of elderly women, all of them religious while devoted to candomblé and popular Catholicism. As a group, the Sisterhood is considered the elite in the stuggle of black people against oppression and slavery in Brazil. The Sisters were and still are distinguished women in many different ways: during the colonial period, they were called black women from the partido alto; mythically transgressing the dominant masculinity, they are considered iamis and organized in a religious ministry that congregates different candomblé nations. They are also the ones who possess the axé (eleyes). In the past, the sisters bought the manumission of other priests and priestesses, and commited to guaranteeing dignified funerals to themselves and to their people. The Celebration is associated with their female antecessors (eguns) and to their orixás during public catholic rituals and secret candomblé ceremonies. According to the sisters, they are living up to a promise made by their antecessors: If all the slaves were freed, they would all worship Mary in life and in death. Characters narrating and staging repeated performances, the sisters develop ritual and musical sequences which go from the annunciation of the death of the Virgin Mary to her vigil on the first day; on the second she is buried and on the third the Sisters demonstrate their belief in life after death through the glorification and elevation of Mary. These are the three most important moments of the public ritual, followed by three days of samba de roda . The samba takes place parallel to the development of the secret rituals started before the Celebration. On the last day of feast, the sisters deliver a gift to the waters, destinated to the female orixás Nanã, Iemanjá and Oxum.
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Bartolini, Sara. "La valutazione della sicurezza delle strade esistenti: Il contributo del mobile eye detector." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7366/.
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L’incidente stradale è la conseguenza di uno o più errori all'interno di un sistema complesso, in cui l'uomo rappresenta la principale causa d’incidentalità. Spesso ciò che può apparire a una prima analisi un errore dell’utente, in realtà può essere collegato a problemi di progettazione e gestione dell’infrastruttura. Per massimizzare i risultati nel campo della sicurezza stradale, occorre valutare il “sistema strada” in ogni suo elemento.
Per raggiungere questi obiettivi le analisi di sicurezza giocano un ruolo fondamentale. Il Road Safety Review consente di individuare nel tracciato la presenza di situazioni di rischio, in modo tale da eliminarli o attenuarli prima che diano luogo ad incidenti.
Il Ministero delle Infrastrutture e dei Trasporti ha emanato le "Linee guida per la gestione della sicurezza delle infrastrutture stradali". Secondo queste Linee Guida l'uomo detiene un ruolo centrale nel sistema. L'uomo deve adattare il suo comportamento, in funzione del veicolo condotto e delle condizioni ambientali.
Diventa indispensabile integrare le analisi di sicurezza con il fattore uomo.
Obiettivo della tesi è analizzare la sicurezza di un’infrastruttura viaria esistente integrando i risultati ottenuti dal Road Safety Review con metodologie innovative che tengano conto del comportamento degli utenti durante la guida.
È stata realizzata una sperimentazione in sito che ha coinvolto un campione formato da 6 soggetti.
Ognuno di essi ha percorso il tronco stradale, della SP26 "Valle del Lavino", in provincia di Bologna. La strada, richiede interventi di adeguamento e messa in sicurezza poiché risulta la terza tratta stradale a maggior costo sociale di tutta la rete provinciale.
La sperimentazione ha previsto due fasi: la prima, in cui è stato condotto il Road Safety Review . La seconda, in cui ogni soggetto ha guidato lungo il tronco stradale, indossando il Mobile Eye-XG, un'innovativa strumentazione eye tracking in grado di tracciare l’occhio umano e i suoi movimenti.
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du, Preez Marlene Geraldine. "Molecular analysis of red colouration in 'Bon Rouge' pear (Pyrus communis L.)." University of the Western Cape, 2018. http://hdl.handle.net/11394/6454.
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Philosophiae Doctor - PhD (Biotechnology)The 'Bon Rouge' pear cultivar was developed from a bud mutation on a 'Bon Chretien' pear tree. The latter is characterised by green fruit skin and leaves, while 'Bon Rouge' is characterised by red leaves and red fruit skin as a result of the production of anthocyanin and other pigments. Branch forming buds on 'Bon Rouge' trees often revert to the parent phenotype producing green leaves and fruit skin. The occurrence of both phenotypes on the same tree presents a unique model to study gene expression associated with anthocyanin production in a similar genetic background under the same set of environmental condition.
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Booi, Sonwabo. "¹Genetic analysis of red pigmentation in ‘bon rouge’ pears (Pyrus communis L.)." Thesis, University of Western Cape, 2014. http://hdl.handle.net/11394/3334.
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>Magister Scientiae - MScEuropean pear (Pyrus communis L.) is the third most important fruit in South Africa after citrus and apple. The Agricultural Research Council (ARC) breeding programme seeks to obtain a fully red coloured pear. Sports (mutants) with red skin and reddish leaves of various cultivars occur and some have been used in breeding programmes, where they transmit red colour as a single gene. The red trait in ‘Max Red Bartlett’, a mutant of ‘Bartlett’ (Synonym – ‘Williams Bon Chretien’), was mapped in Italy to linkage group 4 (LG4). At ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa, ‘Bon Rouge’ pear, another red mutant of ‘Williams Bon Chretien’, was crossed with ‘Packham’s Triumph’ generating an F1 population with a segregation of (54:71) red:green, approximating to a 1:1 ratio; indicating a simple Mendelian inheritance of the red trait. The aim of the study was to determine if the ‘Bon Rouge’ red colour trait maps to approximately the same position as the ‘Max Red Bartlett’ red colour trait on LG4, and if so, to identify SSR markers that are mapped closer to the red colour trait than were previously reported. The seven published pear and apple SSR markers mapped in the appropriate region of LG4 in pear and in apple maps were identified and screened in the parents and, where informative, were scored in 125 seedlings for co-segregation analysis. Single locus segregations were checked with JoinMap 4.1 and this program was also used to generate a genetic map for LG4 of the ‘Bon Rouge’ x ‘Packham’s Triumph’ progeny using the SSR markers and the red locus. Two linkage maps were constructed at a LOD threshold of 3 using the Kosambi mapping function, one each with the maximum likelihood and regression mapping algorithms. The genetic linkage map of LG4 of ‘Bon Rouge’ x ‘Packham’s Triumph’ consisted of seven SSR markers (2 from apple and 5 from pear). Markers CH01d03 and CH02c02b were mapped on the same position as the red trait in ‘Max Red Bartlett’ reported by Dondini et al. (2008) and four more markers were added. One of the newly mapped markers, NH011a has been found to be closely linked to the red trait, with an approximate distance of 4 cM. This marker can be used to indirectly select for the red gene in pear, for example to distinguish heterozygotes from homozygotes. This work sets the scene for further genetic studies on the red trait in pear breeding programmes.
Books on the topic "Rod box"
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Roosevelt, Robert Barnwell. Is Democracy dishonesty?: Are four men to rule New York with a rod of iron? Is the popular voice to be stifled at the ballot-box? New York: Journeymen Printers' Co-operative Association, 1985.
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Bob & Rod. New York: St. Martin's Press, 1994.
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Bianchi, Tom. Bob & Rod. New York: St. Martin's Griffin, 1996.
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The red box. London: Women's Press, 1991.
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Woods, Brenda. The red rose box. New York: Puffin Books, 2004.
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The red rose box. New York: Putnam, 2002.
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Sís, Peter. Tibet: Through the red box. New York: Farrar Straus Giroux, 1998.
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Sís, Peter. Tibet: Through the red box. New York: Farrar Straus Giroux, 1998.
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Sís, Peter. Tibet: Through the red box. New York: Farrar Straus Giroux, 1998.
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Boo of the silver rod. Montgomery, AL: NewSouth Books, 2002.
Find full textBook chapters on the topic "Rod box"
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Miles, Harold. "The Road to Riches." In Bad Ol’ Boy, 96–114. Totowa, NJ: Humana Press, 1993. http://dx.doi.org/10.1007/978-1-4612-0295-0_7.
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Gooch, Jan W. "Bon-Arylamide Red." In Encyclopedic Dictionary of Polymers, 89. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1477.
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Bastin, Bruce. "Blind Boy Fuller." In Red River Blues, 214–40. London: Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-09343-4_13.
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Trusheim, Felix, Alexandru Condurache, and Alfred Mertins. "Visual Landmark Based 3D Road Course Estimation with Black Box Variational Inference." In Computer Analysis of Images and Patterns, 332–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64689-3_27.
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Oreko, Benjamin Ufuoma, and Stanley Okiy. "Application of Box-Jenkins Model in Predicting Road Traffic Crashes in Nigeria." In Transactions on Engineering Technologies, 157–70. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2191-7_12.
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Neal-Boylan, Leslie, and Steven Rotkoff. "The Red Team Tool Box: Understanding the Problem and Envisioning the Future." In Innovative Decision Making in Healthcare, 35–46. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72648-5_4.
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Acree, M. Ellen. "A 9-Year-Old Boy with a Red Eye." In The Infectious Disease Diagnosis, 235–37. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64906-1_43.
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Takiuchi, Haru. "Alan Garner’s Red Shift: The Anger of the Scholarship Boy." In British Working-Class Writing for Children, 105–28. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55390-0_6.
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Tiwari, Rishi, Mohammed Afaque, Amit Sangroya, and Mrinal Rawat. "ROC Bot: Towards Designing Virtual Command Centre for Energy Management." In Lecture Notes in Computer Science, 155–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75015-2_16.
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Ghosh, Arpita. "IBM Watson Assistant and Node-RED-Based Movie Ticketing Bot Design." In Algorithms for Intelligent Systems, 307–16. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2109-3_30.
Full textConference papers on the topic "Rod box"
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Mizutani, Yoshitaka, Shigeo Hosokawa, and Akio Tomiyama. "Two-Phase Flow Patterns in a Four by Four Rod Bundle." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89332.
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Air-water two-phase flow patterns in a four by four square lattice rod bundle consisting of an acrylic channel box of 68 mm in width and transparent rods of 12 mm in diameter were observed by utilizing a high speed video camera, FEP (fluorinated ethylene propylene) tubes for rods, and a fiberscope inserted in a rod. The FEP possesses the same refractive index as water, and thereby, whole flow patterns in the bundle and local flow patterns in subchannels were successfully visualized with little optical distortion. The ranges of liquid and gas volume fluxes, <JG> and <JL>, in the present experiments were 0.1 < <JL> < 2.0 m/s and 0.04 < <JG> < 8.85 m/s, which covered typical two-phase flow patterns appearing in a fuel bundle of a boiling water nuclear reactor. As a result, the following conclusions were obtained: (1) the region of slug flow in the <JG> – <JL> flow pattern diagram is so narrow that it can be regarded as a boundary between bubbly and churn flows, (2) the boundary between bubbly and churn flows is close to the boundary between bubbly and slug flows of the Mishima & Ishii’s flow pattern transition model, and (3) the boundary between churn and annular flows is well predicted by the Mishima & Ishii’s model.
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Benke, Qin, Li Leishi, and Bo Hanliang. "Numerical and Experimental Analysis of the Control Rod Hydraulic Deceleration Device for the Control Rod Hydraulic Drive System." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66463.
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Control rod hydraulic drive system (CRHDS), which is invented by INET, Tsinghua University, is a new type of internal control rod drive technology. Control rod hydraulic deceleration device (CRHDD), which consists of the plug, the hydraulic deceleration cylinder, the hydraulic buffer, etc., is one of the main components of the CRHDS. The plug is connected with the top of the control rod driving shaft and moves along with the control rod inside the hydraulic deceleration cylinder. The CRHDD performs the rod dropping deceleration function through the interworking of the plug and the deceleration cylinder which is filled with water, and reduces the rod dropping peak acceleration and the impact force acting upon the control rod to prevent the control rod cruciform blade from being deformed or damaged. The working mechanism of the CRHDD is presented and analyzed. The rod dropping performance of the CRHDS was tested experimentally under room temperature. The theoretical model of the control rod dropping process, which is composed of the three dimensional flow field analysis and flow resistance calculation of the hydraulic deceleration cylinder, the kinematics and dynamics model of the control rod, is built whose results are compared and validated by the CRHDS scram test results under room temperature. Then the model takes into account of the influence of the fuel assembly box on the control rod scram process under high temperature working conditions, and is used to analyze the influence of the key parameters, including the helical spring stiffness inside the deceleration cylinder and the working temperature on the CRHDD working performance. The research results can give guidance for the design and optimization of the CRHDD.
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Wang, Bing, and Shunli Wang. "Design and Realization of Automatic Forming Machine for Welding Rod Box Based on PLC Control." In 2016 International Conference on Automatic Control and Information Engineering. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icacie-16.2016.25.
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Han, Xu, Xiuzhong Shen, Toshihiro Yamamoto, Ken Nakajima, and Takashi Hibiki. "Flow Characteristics of Upward Two-Phase Flows in a Rod Bundle Geometry." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16740.
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Abstract In the present paper, the local two-phase flow parameters were measured with a four-sensor optical probe in adiabatic upward air-water two-phase flows in a 6 × 6 vertical rod bundle with rod diameter of 10 mm, pitch of 16.7 mm, square channel box side length of 100 mm and hydraulic equivalent diameter (DH) of 18.7 mm. The local measurements were performed in an octant triangular region of the rod bundle cross-section at the axial position with height-to-diameter ratio (z/DH) of 149 under a total of 16 flow conditions. The local void fraction, interfacial area concentration (IAC), bubble diameter and bubble velocity were obtained in the four-sensor probe measurements. Both of the measured void fraction and IAC show their radial local distributions with the core-peaking and wall-peaking shapes which are closely linked with the superficial velocity of two phases. The distribution shapes tend to change from the core-peaking to the wall-peaking when the superficial liquid velocity (<jf>) increases and the superficial gas velocity (<jg>) decreases. The measured diameters of local bubbles keep the similar values in the measuring cross-section, increase when the <jg> increases and decrease when the <jf> increases. The bubbles behave with the velocities whose main flow direction component keeps a typical radial power-law (core-peaking) profile and whose cross-sectional velocity components show a significant trend of bubbles migrating from the center to the wall region of the channel box especially under high <jf> conditions. The area-averaged results of void fraction and IAC were obtained by a cross-sectional area-averaging scheme. The resultant area-averaged void fraction and IAC were used to check the void fraction predicting capability of two drift-flux correlations and the IAC prediction performance of two IAC correlations respectively. The applicability of these correlations to the rod bundle geometry was discussed and concluded finally in this paper.
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Victor, Ste´phane, Rachid Malti, Pierre Melchior, and Alain Oustaloup. "From System Identification to Path Planning Using Fractional Approach: A Thermal Application Example." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87014.
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This paper presents a global fractional approach from system identification to path planning; these results will be applied to a typical fractional application: a thermal diffusion in an aluminium rod. The objective is to follow a desired path using fractional linear flatness. However, models of true systems are not always known. Through a black box identification using a fractional model, the temperature versus the heat flux of an aluminium rod is modeled. The coosrivcf algorithm enables to optimize as well the parameter coefficients and the commensurate order. The fractional flat output generates the input command so that the system follows that desired path.
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Xu, Ziqiang, Shihui Luo, and Weihua Ma. "Dynamic simulation to solve protruding issue on axle box rod rubber joint of 2B0 heavy haul locomotive." In 2010 International Conference on Computer Design and Applications (ICCDA 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccda.2010.5541324.
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Qiu, Chufa, Bruno Raverdy, Vincent Faucher, and André Bergeron. "Influence of Inlet Turbulent Flow Generated by Periodic Computations on the Pressure Drop and Axial Velocity Distribution Predictions." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64275.
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Abstract This study presents the CFD modeling of the adiabatic rod bundle test (MANIVEL) with a Simple Support Grid (SSG) at a Reynolds number of 100 000. Calculations are carried out on grid using a one-block fully hexahedral mesh. To reduce the computational power requirements, the computational domain is limited to one span with one SSG. The inlet is a fully developed turbulent flow obtained using periodic computations that are applied on two different domains: an inlet box and a span box. The mean axial velocity distribution at different elevations and pressure drop are compared with measurements. Small discrepancies of the mean velocity distributions and of the pressure drop per span are observed between the two types of periodic inlet conditions. The influence of SSG is not negligible and is still present downstream. The application of periodic conditions generated on span box is closer to experimental data and so is more appropriate.
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Irwanto, Dwi, Akira Satou, Takeshi Takeda, and Hideo Nakamura. "A Preliminary 3D Steam Flow Analysis for CET Behavior During LSTF SBLOCA Experiment Using FLUENT Code." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16808.
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A 3D steam flow within simulated fuel bundle of Large Scale Test Facility (LSTF), a PWR system simulator, has been investigated by Computational Fluid Dynamics (CFD) analysis with Ansys Fluent code to clarify influences of the steam flow on Core Exit Temperature (CET) response. A LSTF SBLOCA experiment with 1.5% hot leg break as the OECD/NEA ROSA-2 Project Test 3 was simulated by the CFD code to clarify relation between CET and fuel rod surface temperature. A portion of the LSTF core above the mixture level up to around CET sensors was modeled by taking into account high, medium and low heat-zone heater rod bundle, including internal structures such as end-box and upper core plate (UCP). Simulation of steady-state condition at a certain time when mixture level lowered to a certain position at around half of the core height (post-5) was carried out by considering relevant boundary conditions which were developed based on the LSTF Test 3 results. The calculation results revealed that inner structures of the core such as core spacer, end box and UCP indeed affect the CET due to heat transfer from hot steam to these cool structures. 3D flow mixing may also contribute to the final CET values and the delayed increase in the CET relative to the Peak Cladding Temperature (PCT) in the core.
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Song, Fei, and Ke Li. "Nonlinear Finite Element Modeling and Experimental Validation of Advanced High Fatigue Strength Threaded Connections for Sucker Rod Pumping Applications." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-72196.
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Abstract Rod pump systems can be the most commonly used artificial lift technology for oil production. A rod pump system that brings underground oil to the earth’s surface consists of a prime mover, a surface pump, a sucker rod string, and a downhole pump. A pin at each end of the rod and a box coupling are threaded together to connect the sucker rod and form the rod string. The sucker rod string acts as the connecting link between the surface pumping unit and the subsurface rod pump. The loads generated from the reciprocating upstroke and downstroke motions could impose a risk of fatigue failure in the sucker rod connections with cyclic tensile stresses. The increasingly harsh field operational conditions that require deeper wells and higher production are pushing the connections to their limits. As a result, failures of the standard API (the American Petroleum Institute) sucker rod connections are becoming increasingly more frequent. The resulting rod string failures are expensive to repair because the whole string must be disassembled and removed so that the failed rod can be accessed, and the rod string must then be reassembled. Such high repair cost is unaffordable for the wells with low production rates. Therefore, there is a strong demand for having a threaded connection design with high fatigue strength that is suitable for sucker rod pumping applications. To enable a long service life and to reduce cost of service delivery caused by frequent repairs, an advanced rod pump threaded connection design with significantly improved fatigue resistance over the standard API design has been developed and experimentally qualified. Modeling and simulation techniques had been extensively used to drive the design and qualification process. The newly developed connection design is featured by an optimized thread form and stress relief groove, and an advanced manufacturing process. Nonlinear finite element analysis (FEA) was extensively utilized to predict the fatigue resistance of the threaded connection with makeup torque and service stroke loads, and to explore and optimize the designs of the threads and stress relief feature prior to physical prototyping and testing. The FEA models had favorably predicted the performance of the new design, which was later experimentally validated through full-scale axial and rotary bending fatigue tests, respectively. The work presented in the paper sets a successful example of model-driven design, which can significantly shorten the development time and cost. The newly developed high fatigue strength sucker rod connections have great potential for mitigating the risk of rod string failures during pumping operations and therefore improving operational reliability for both beam and progressing cavity pumping systems.
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Katono, Kenichi, Jun Nukaga, Takuji Nagayoshi, and Kenichi Yasuda. "Measurement of Three-Dimensional Time-Averaged Void Fraction Distribution in Rod Bundle in Air-Water System by X-Ray CT Technique." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16814.
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We have been developing a void fraction distribution measurement technique using the three-dimensional (3D) time-averaged X-ray CT (computed tomography) system to understand two-phase flow behavior inside a fuel assembly for BWR (boiling water reactor) thermal hydraulic conditions of 7.2 MPa and 288 °C. Unlike CT images of a normal standstill object, we can obtain 3D CT images that are reconstructed from time-averaged X-ray projection data of the intermittent two-phase flow. We measured the 3D void fraction distribution in a vertical square (5 × 5) rod array that simulated a BWR fuel assembly in the air-water test. From the 3D time-averaged CT images, we confirmed that the void fraction at the center part of the channel box was higher than that near the channel box wall, and the local void fraction at the central region of a subchannel was higher than that at the gap region of the subchannel. A comparison of the volume-averaged void fractions evaluated by the developed X-ray CT system with those evaluated by a differential pressure transducer in a void fraction range from 0.05 to 0.40 showed satisfactory agreement within a difference of 0.03.
Reports on the topic "Rod box"
1
Mohan, Nikita, Shivira Shukla, Aristo Mendis, Nirmal Kulkarni, and Uttara Mendiratta. Illegal Trade of Red Sand Boa in India: 2016-2021. Wildlife Conservation Society, 2022. http://dx.doi.org/10.19121/2020.report.43708.
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Avery, M. P. Vitrinite reflectance [Ro] of dispersed organics from Huskey-Bow Valley et al. Glooscap C-63. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130610.
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Avery, M. P. Vitrinite reflectance [Ro] of dispersed organics from Huskey-Bow Valley et al. Louisberg J-47. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130611.
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Avery, M. P. Vitrinite Reflectance [Ro] of Dispersed Organics From Husky - Bow Valley Et Al., Evangeline H-98. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/130750.
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Avery, M. P. Vitrinite Reflectance (Ro) of Dispersed Organics From Husky-Bow Valley et al, Trave E-87. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130503.
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Avery, M. P. Vitrinite Reflectance (Ro) of Dispersed Organics From Husky-Bow Valley et al Archer K-19. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130506.
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Avery, M. P. Vitrinite reflectance [Ro] of dispersed organics from Huskey-Bow Valley et al. South Griffin J-13. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130609.
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Avery, M. P. Vitrinite reflectance [Ro] of dispersed organics from Huskey-Bow Valley et al., North Dana I-43. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130612.
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Avery, M. P. Vitrinite reflectance (Ro) of dispersed organic matter from Husky/Bow Valley et al Panther P-52. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212610.
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Avery, M. P. Vitrinite reflectance (Ro) of dispersed organic matter from Husky/Bow Valley et al Golconda C-64. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212644.
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