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Journal articles on the topic "Curtis stage"
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Rashid, Stephen, Matthew Tremmel, John Waggott, and Randall Moll. "Curtis Stage Nozzle/Rotor Aerodynamic Interaction and the Effect on Stage Performance." Journal of Turbomachinery 129, no. 3 (June 16, 2006): 551–62. http://dx.doi.org/10.1115/1.2720481.
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Curtis, or velocity compounded, stages commonly don’t achieve the same accuracy of performance prediction expected of most other turbine stages. A review of Curtis stage design practices, field wear, and dirt patterns, in conjunction with performance testing and computational fluid dynamics (CFD) modeling, determined that the nozzle/rotor aerodynamic interaction is far more complex than typical design and performance calculations assume. Understanding this nozzle/rotor interaction is key to obtaining both improved performance, and a more accurate performance prediction. This paper discusses the nature of this interaction, and it’s implications to Curtis stage performance prediction.
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Koprowski, Arkadiusz, and Romuald Rządkowski. "Optimization of Curtis stage in 1 MW steam turbine." E3S Web of Conferences 137 (2019): 01039. http://dx.doi.org/10.1051/e3sconf/201913701039.
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When operating at 3000 rpm, small turbines do not require a gear box and the generator does not require complex electronic software. This paper analyses the various geometries of the Curtis stage, comprising two rotor and stator blades with and without an outlet, from the efficiency point of view. Presented are 3D steady viscous flows. The results were compared with the performance of an axial turbine.
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Gidley, Mick. "“The Vanishing Race” in Sight and Sound: Edward S. Curtis's Musicale of North American Indian Life." Prospects 12 (October 1987): 59–87. http://dx.doi.org/10.1017/s0361233300005536.
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On November 19, 1911, Edward S. Curtis (1868–1952), the “photohistorian” of American Indians, wrote to his friend Edmond S. Meany, Professor of History at the University of Washington, about his latest triumphs. “Dear Brother Meany,” he began, “I think we can say that my lecture entertainment ‘arrived’. I wish you could have been present at the Carnegie Hall affair. The tremendous auditorium was filled to overflowing, a sea of people from the stage to the very ‘sky’ itself.” Curtis had been introduced by Henry Fairfield Osborn, Director of the American Museum of Natural History; just before they stepped into view Osborn looked through the foliage and, according to Curtis, had remarked, ‘“Do you realise that that is almost an appalling audience, and one that few men in their life-time have the privilege of facing?’” “I think,” Curtis added, “he was a little nervous on his own account and slightly so on mine, [but] rather than causing nervousness … it gave me courage and I was absolutely certain of myself after my first two words.” “Osborn's voice,” Curtis explained, “lacks the carrying power and his slight nervousness meant a rather halting introduction. This was evidently greatly to my advantage, as the minute I spoke I reached the farther-most corners and my voice caught and held the people.”
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Kamrowski, Ruth L., Col Limpus, Kellie Pendoley, and Mark Hamann. "Influence of industrial light pollution on the sea-finding behaviour of flatback turtle hatchlings." Wildlife Research 41, no. 5 (2014): 421. http://dx.doi.org/10.1071/wr14155.
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Context Numerous studies show that artificial light disrupts the sea-finding ability of marine turtle hatchlings. Yet very little has been published regarding sea-finding for flatback turtles. Given the current industrialisation of Australia’s coastline, and the large potential for disruption posed by industrial light, this study is a timely investigation into sea-finding behaviour of flatback turtle hatchlings. Aims We investigate sea-finding by flatback turtle hatchlings in relation to ambient light present in areas of planned or ongoing industrial development, and evaluate the fan and arena-based methods that are frequently used for quantifying hatchling dispersion. Methods Using a combination of methods, we assessed the angular range and directional preference of sea-finding hatchlings at two key flatback turtle rookeries, Peak and Curtis Islands, during January–February 2012 and 2013, and at Curtis Island in January 2014. Relative light levels at each site were measured using an Optec SSP-3 stellar photometer, and moon phase, moon stage and cloud cover were also recorded. Key results We found no evidence of impaired hatchling orientation, and observed very low levels of light at Peak Island. However, at Curtis Island, hatchlings displayed reduced sea-finding ability, with light horizons from the direction of nearby industry significantly brighter than from other directions. The sea-finding disruption observed at Curtis Island was less pronounced in the presence of moonlight. Conclusions The reduced sea-finding ability of Curtis Island hatchlings was likely due to both altered light horizons from nearby industry, as well as beach topography. Both methods of assessing hatchling orientation have benefits and limitations. We suggest that fan-based methods, combined with strategically placed arenas, would provide the best data for accurately assessing hatchling sea-finding. Implications Sky glow produced by large-scale industrial development appears detrimental to sea-finding by flatback turtle hatchlings. As development continues around Australia’s coastline, we strongly recommend continued monitoring of lighting impacts at adjacent turtle nesting beaches. We also advise rigorous management of industrial lighting, which considers cumulative light levels in regions of multiple light producers, as well as moon phase, moon-stage, cloud cover and time of hatchling emergence. All these factors affect the likelihood of disrupted hatchling sea-finding behaviour at nesting beaches exposed to artificial light-glow, industrial or otherwise.
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Rodger, Johnny. "Putting Holl and Mackintosh in multi-perspective: the new building at the Glasgow School of Art." Architectural Research Quarterly 17, no. 1 (March 2013): 24–36. http://dx.doi.org/10.1017/s135913551300033x.
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The announcement that American architect Steven Holl had won the competition to design a new building for the Glasgow School of Art opposite Charles Rennie Mackintosh's original (built 1897–1909), and the revelation of his plans to the public, provoked plenty of criticism about the possible relationship between the two buildings. Professor William Curtis first wrote on the topic in the Architects' Journal almost a year from the announcement, and his opinions on the relationship were forthright: ‘Rather than dialogue’, he argued, ‘there is a dumb lack of articulation in construction and material.’ A response came in the following issue of the AJ from David Porter, then Professor at the Mackintosh School of Architecture. He disagreed with Curtis, claiming that the new building will have ‘an extraordinary spatial richness’ and that ‘the original sketch Curtis saw in Glasgow last December has progressed very rapidly’, for it was but an early stage in ‘a design strategy driven forward with a mixture of poetics and ruthless pragmatics: qualities that are singularly appropriate in this context, and developed with artistry and skill’.Curtis subsequently wrote a further open letter to ‘the Governors, the Director, the Faculty, Students, Staff, Alumnae and Alumni’ of Glasgow School of Art, which was published in facsimile in the Architects' Journal on 3 March 2011:What a disappointment then to contemplate Steven Holl's proposed addition. It is horrendously out of scale, it dominates Mackintosh, it does not create a decent urban space, it fails to deal with the context near and far, it is clumsy in form and proportion, it lacks finesse in detail, has no relationship to the human figure, and is a stillborn diagram dressed up in Holl clichés such as ‘iceberg’ glass.
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Holland, Peter. "Curtis A. Price, Henry Purcell and the London Stage. Cambridge, Cambridge University Press, 1984. xiv + 380 pp." Early Music History 5 (October 1985): 275–85. http://dx.doi.org/10.1017/s0261127900000735.
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Song, Yuxin, Lei Li, YinJiao Fei, Wenquan Chen, Guan qun Wo, and Jinhai Tang. "SGK1 regulated apoptosis in invasive breast carcinoma." Journal of Clinical Oncology 39, no. 15_suppl (May 20, 2021): e13061-e13061. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.e13061.
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e13061 Background: Worldwide, breast cancer is the most common type of cancers and the presentation of drug resistance is often associated with poor prognosis. Previous studies have shown the mechanism of drug resistance was affected by apoptosis at different levels in the signaling cascades. This article is aimed to explore the relationship between the serum and glucocorticoid-regulated kinase 1 (SGK1) and apoptosis in invasive breast cancer (IBC). Methods: We evaluated the expression of SGK1 in IBC using publicly available data from The Cancer Genome Atlas (TCGA) and Curtis Breast program. TaqMan probe-based qRT-PCR assay and Western Blot analysis were performed to quantitatively detect the expression of SGK1 at RNA and protein levels in the IBC specimens. Clinicopathologic characteristics associated with overall survival were tested by Cox regression. Gene Set Enrichment Analysis (GSEA) was performed to mine the biological pathways involved in IBC pathogenesis related SGK1 regulatory network using MSigDB database. Immunohistochemistry staining (IHC) was used to detect apoptotic markers Fas, Bcl2 and SGK1 in the IBC specimens. Results: Totally 1109 IBC samples with SGK1 expression data were downloaded from TCGA databases for analyzed. SGK1 expression was elevated in normal breast tissues compared with both invasive ductal carcinoma and invasive lobular carcinoma (p < 0.0001). Among them, SKG expression in 112 tumor tissues was significantly lower than that in paracancerous tissues, especially in advanced patients with TNM stage IV. Western Blot and qRT-PCR assay confirmed that SGK1 expression in IBC was distinctly lower than normal. The Kaplan-Meier survival analysis showed that decreased expression of SGK1 was significantly correlated with the clinical stage (p = 0.036). In Curtis Breast program, we further verified SGK1 gene expression was reduced in stage IV than stage I. The univariate analysis demonstrated that clinicopathologic variables associated with poor survival include age, advanced stage, lymph nodes, distant metastasis and deep myometrial invasion. GSEA revealed that apoptosis was differentially enriched when SGK1 was highly expressed. Similarly, TCGA data indicated that the positive rate of SGK1 was higher in Fas positive IBCs, and the same result was also obtained by IHC in the IBC specimens. Conclusions: Expression of SGK1 regulated apoptosis in invasive breast carcinoma, which might be a potential therapeutic target to overcome refractory and drug-resistant breast cancer.
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Muller, Eridani. "Queensland’s Threatened Animals." Pacific Conservation Biology 20, no. 1 (2014): 127. http://dx.doi.org/10.1071/pc140127.
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THE explosion of the mining industry, recent change of government and ongoing debates over climate change and use of national parks makes threatened animals and their protection a red hot issue for many in the conservation sector in Queensland. Under “How to use this book” (p. 16) Lee Curtis states that “we hope that the information offered will lead you quickly and efficiently to the next step that will help to halt the population declines of threatened animals in our state”; the naivety of such a statement will not appeal to scientists in the field who constantly fight for increased legislative protections for threatened species, and actively work on on-ground management programs in attempts to halt such population declines. Anybody who has reached a stage where they are able to effect such a change
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Ge, Chen, Jiayao Hu, Zimiao Zhao, Ary A. Hoffmann, Shuojia Ma, Li Shen, Jie Fang, Jianqing Zhu, Weidong Yu, and Weibin Jiang. "Phylogeny and Density Dynamics of Wolbachia Infection of the Health Pest Paederus fuscipes Curtis (Coleoptera: Staphylinidae)." Insects 11, no. 9 (September 11, 2020): 625. http://dx.doi.org/10.3390/insects11090625.
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The maternally inherited obligate intracellular bacteria Wolbachia infects the reproductive tissues of a wide range of arthropods and affects host reproduction. Wolbachia is a credible biocontrol agent for reducing the impact of diseases associated with arthropod vectors. Paederus fuscipes is a small staphylinid beetle that causes dermatitis linearis and conjunctivitis in humans when they come into contact with skin. Wolbachia occur in this beetle, but their relatedness to other Wolbachia, their infection dynamics, and their potential host effects remain unknown. In this study, we report the phylogenetic position and density dynamics of Wolbachia in P. fuscipes. The phylogeny of Wolbachia based on an analysis of MLST genotyping showed that the bacteria from P. fuscipes belong to supergroup B. Quantitative PCR indicated that the infection density in adults was higher than in any other life stage (egg, larva or pupa), and that reproductive tissue in adults had the highest infection densities, with similar densities in the sexes. These findings provide a starting point for understanding the Wolbachia infection dynamics in P. fuscipes, and interactions with other components of the microbiota.
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Hare, Arnold. "Henry Purcell and the London Stage. By Curtis Alexander Price. Cambridge: Cambridge University Press, 1984. Pp. xiv + 380 + 8 illustrations. £30." Theatre Research International 10, no. 3 (1985): 243–45. http://dx.doi.org/10.1017/s0307883300011020.
Full textDissertations / Theses on the topic "Curtis stage"
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Vítek, Tomáš. "Parní kondenzační turbína malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400497.
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The goal of this Master’s thesis is to create the design of a low power condensing steam turbine. The turbine has a Curtis control stage and a reaction blading. The work also contains the calculation of gland labyrinth seals and the balancing piston, specification of a forces and losses at bearings. Finally, the gearbox and generator are selected and the efficiency at generator’s clamps is specified. The Master’s thesis includes the design drawing of a longitudinal turbine view.
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Pavliska, Vojtěch. "Parní turbína pro pohon napájecího čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417533.
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This diploma thesis performs a calculation of a steam turbine to drive a feed pump. The research part deals with the basic classification of steam turbines focusing on mechanical drive steam turbines. The second part of the thesis is a controlled extraction pressure optimization for achieving the maximum possible thermic efficiency of the cycle. The last part of the thesis shows a detailed thermodynamic calculation of the mechanical drive turbine along with the basic geometric parameters of the flow canal.
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Amato, William J. III. "The Technical Direction of the 2009 Kent State University School of Theatre and Dance Production of Twelfth Night." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1241188098.
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Nagarathinam, Shenbaga Murthy Divya. "The Ohio State University's Production of REAL WOMEN HAVE CURVES and MATCHMAKER." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338320221.
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Boerseth, Cathrine. "Spatial dynamics and characterization of the ichthyoplankton community of natural and artificial reef environments on the coast of Paraná state, south Brazil." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/21/21134/tde-19122016-164859/.
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Artificial reefs (ARs) have been deployed on the inner shelf of Paraná State, south Brazil, to recuperate marine biodiversity and as protection against destructive trawling activities. The purpose of this study was to offer a first characterization of the ichthyoplankton community associated with the ARs and the adjacent archipelago of Currais. Two sampling methodologies were used; 1) plankton net attached to an underwater scooter and; 2) light-traps. A hydrodynamic model was used to study dispersal trajectories to and from the study area. Sampling was conducted between 31.07.14 and 04.04.16. A total of 13 families and 11 species were identified, expanding the total species list of the study area with six species and four families; 63% of fish larvae caught on the ARs were of reef associated species; abundance and species richness was higher on the ARs compared to samples taken at a distance from the ARs. First occurrence of the invasive muzzled blenny Omobranchus punctatus was registered. The hydrodynamic model provided insight on dispersal trajectories and connectivity. The results of this study can be used to better define guidelines for sustainable use of the ARs and the Currais archipelago, a Marine National Park since 2013.Recifes Artificiais (RA) foram implantados na plataforma interna do Paraná, sul do Brasil, para atuar como unidades anti-arrasto e para oferecer habitat e abrigo para a fauna local, na tentativa de recuperar a biodiversidade marinha ameaçada pelo pesca de arrasto. O principal objetivo deste estudo foi oferecer uma primeira caracterização da assembleia ictioplanctônica associada aos RAs e ao arquipélago de Currais. Coletas foram realizadas utilizando duas metodologias; 1) rede de plâncton acoplado a uma \"scooter\" subaquática e; 2) armadilhas de luz. Excursões amostrais foram realizadas entre 31.07.14 e 04.04.16. Um total de 13 famílias e 11 espécies de peixes representadas no ictioplâncton foram identificadas. Foi registrada a primeira ocorrência do blenídeo invasivo Omobranchus punctatus. A abundância de ictioplâncton foi maior em amostras dos RAs comparado às coletas em área-controle; 63% das larvas capturadas nos RAs foram de espécies recifais. Um modelo hidrodinâmico forneceu uma visão sobre as trajetórias de dispersão larval e conectividade ecológica na região. Os resultados deste estudo podem ser usados para melhor definir diretrizes para o uso sustentável dos RAs e do arquipélago de Currais, um Parque Nacional Marinho desde 2013.
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Darienzo, Matteo. "Detection and estimation of stage-discharge rating shifts for retrospective and real-time streamflow quantification." Thesis, Université Grenoble Alpes, 2021. http://www.theses.fr/2021GRALU006.
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Les séries temporelles de débit des rivières sont établies à l'aide de "courbes de tarage", qui sont des modèles avec les hauteurs d’eau en entrée et les débits en sortie. Malheureusement, de nombreuses stations hydrométriques ont une relation hauteur-débit instable, notamment à cause de l’évolution du lit de la rivière lors des crues. Ces "détarages" posent problème à la fois pour l'établissement des séries hydrologiques de long-terme (analyse rétrospective) et pour la fourniture de données en temps réel, par exemple pour la prévision des inondations, avec des incertitudes quantifiées et fiables. Les méthodes existantes pour la mise à jour de la courbe de tarage sont basées sur une analyse statistique des données de calibration (jaugeages) passées ou sur des règles empiriques. Cette thèse a permis de développer des méthodes originales pour la détection automatique des détarages et l'estimation de leur amplitude en rétrospectif et en temps réel : une méthode de segmentation des résidus entre les jaugeages et une courbe de référence, une analyse des récessions du limnigramme et une détection de détarages potentiels à partir d'un indicateur disponible en temps réel (par exemple, transport sédimentaire cumulé). L'approche probabiliste permet d'une part de prendre en compte l'incertitude des informations sur les détarages et d'autre part de quantifier les incertitudes sur les débits calculés. La combinaison des trois méthodes a été appliquée à la station de l’Ardèche à Meyras, en France, qui présente des détarages nets après chaque crue importante. Une bonne détection et estimation des détarages a été observée en rétrospectif et en temps réel. La méthode est générale et applicable en opérationnel à d’autres stations après validation. La méthode est générique et, après davantage de validation, applicable en opérationnel à d'autres sitesRiver discharge time series are established using "rating curves", which are models with stage as input and discharge as output. Unfortunately, many hydrometric stations have an unstable stage-discharge relation, particularly because of the change in the river bed during floods. These "rating shifts" pose a problem both for the establishment of long-term hydrological series (retrospective analysis) and for the delivery of real-time data, for example for flood forecasting, with quantified and reliable uncertainties. The existing methods for updating the rating curve are based on a statistical analysis of past calibration data (the gaugings) or on empirical rules. This thesis aims at developing some original methods for the automatic detection of rating shifts and the estimation of their magnitude in both retrospective and real time: a method of segmentation of the residuals between the gaugings and a base rating curve, an analysis of the stage recessions and a method for detecting potential shifts from an indicator available in real time (e.g. cumulative sediment transport). The probabilistic approach allows on the one hand to take into account the uncertainty of the information on the shift and on the other hand to quantify the uncertainties of the calculated streamflow. The combination of the three methods has been applied to the Ardèche at Meyras, France, which shows net shifts after each major flood. Good detection and estimation of the rating shift has been observed retrospectively and in real time. The method is generic and, after further validation, operationally applicable to other sites
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Salehian, Ali. "PREDICTING THE DYNAMIC BEHAVIOR OF COAL MINE TAILINGS USING STATE-OF-PRACTICE GEOTECHNICAL FIELD METHODS." UKnowledge, 2013. http://uknowledge.uky.edu/ce_etds/9.
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This study is focused on developing a method to predict the dynamic behavior of mine tailings dams under earthquake loading. Tailings dams are a by-product of coal mining and processing activities. Mine tailings impoundments are prone to instability and failure under seismic loading as a result of the mechanical behavior of the tailings. Due to the existence of potential seismic sources in close proximity to the coal mining regions in the United States, it is necessary to assess the post-earthquake stability of these tailings dams.
To develop the aforementioned methodology, 34 cyclic triaxial tests along with vane shear tests were performed on undisturbed mine tailings specimens from two impoundments in Kentucky. Therefore, the liquefaction resistance and the residual shear strength of the specimens were measured. The laboratory cyclic strength curves for the coal mine specimens were produced, and the relationship between plasticity, density, cyclic stress ratio, and number of cycles to liquefaction were identified.
The samples from the Big Branch impoundment were generally loose samples, while the Abner Fork specimens were dense samples, older and slightly cemented. The data suggest that the number of loading cycles required to initiate liquefaction in mine tailings, NL, decreases with increasing CSR and with decreasing density. This trend is similar to what is typically observed in soil. For a number of selected specimens, using the results of a series of small-strain cyclic triaxial tests, the shear modulus reduction curves and damping ratio plots were created.
The data obtained from laboratory experiments were correlated to the previously recorded geotechnical field data from the two impoundments. The field parameters including the SPT blow counts (N1)60, corrected CPT cone tip resistance (qt), and shear wave velocity (vs), were correlated to the laboratory measured cyclic resistance ratio (CRR). The results indicate that in general, the higher the (N1)60 and the tip resistance (qt), the higher the CSR was.
Ultimately, practitioners will be able to use these correlations along with common state-of-practice geotechnical field methods to predict cyclic resistance in fine tailings to assess the liquefaction potential and post-earthquake stability of the impoundment structures.
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Melo, Igor Delgado de. "Estimação estática de estados harmônicos em redes trifásicas de distribuição monitoradas por PMUs: uma abordagem considerando curvas diárias de carga." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/8019.
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Este trabalho apresenta uma nova metodologia para a estimação de estados harmônicos em redes de distribuição de energia elétrica, a partir da modelagem de problemas de otimização, em uma abordagem estática. Assume-se que medições fasoriais sincronizadas são obtidas continuamente por um número reduzido de PMUs (Phasor Measurement Units) estrategicamente alocadas no sistema. Correntes harmônicas passantes em todos os ramos da rede elétrica são variáveis de estado a serem estimadas em coordenadas retangulares. Valendo-se do uso de leis de Kirchhoff, outras grandezas elétricas são calculadas como fasores de tensão, potências ativa e reativa. Os problemas de otimização são modelados para cada ordem harmônica individualmente e para cada intervalo de tempo em que o algoritmo for executado, com o objetivo de estimar estados harmônicos ao longo do tempo, considerando curvas diárias de carga. A função objetivo é determinada a partir do método dos mínimos quadrados ponderados, almejando minimizar o somatório das diferenças quadráticas entre os valores medidos e os valores correspondentes estimados pelo método proposto. Para as barras não monitoradas por PMUs, potências ativa e reativa são consideradas como restrições de desigualdade com limites inferiores e superiores definidos por fatores percentuais, assumindo incertezas sobre as variações de carregamento e componentes harmônicas a serem estimadas em intervalos de tempo regulares. Os problemas de otimização são resolvidos usando o método de pontos interiores com barreira de segurança adaptado, em que a solução ótima é dada sem violação de restrições, através da introdução de um parâmetro de relaxamento que permite que os valores inferiores e superiores das restrições que atingirem seus respectivos valores limites sejam relaxados para que a solução ótima seja encontrada. Sistemas teste de distribuição de energia elétrica trifásicos, topologicamente radial são utilizados para validação da metodologia proposta. Análises de sensibilidade são consideradas para avaliar o tempo computacional, número de PMUs alocadas, geração distribuída, filtro harmônico e parâmetros usados pelo algoritmo proposto. Vantagens deste trabalho incluem número limitado de PMUs a ser instalado, identificação de múltiplas fontes harmônicas, estimação de curvas diárias de carga e componentes harmônicas ao longo do tempo, com erros de estimação reduzidos.
This work presents a novel methodology for harmonic state estimation in electric power distribution networks, based on optimization problems formulation, in a static approach. It is assumed that synchronized phasor measurements are continuously obtained using a reduced number of PMUs (Phasor Measurement Units) strategically allocated into the system. Harmonic branch currents passing through the branches of the network are the state variables to be estimated in rectangular coordinates. Based on Kirchhoff’s laws, other electrical quantities are calculated, such as voltage phasors, active and reactive powers. An optimization problem is modelled for each harmonic order individually and for each time interval in which the algorithm is executed, with the objective of estimating harmonic states along the time, considering daily load curves. The objective function is determined based on the weighted least squares method, aiming to minimize the sum of the quadratic difference between measured and estimated values by the proposed method. For the buses which are not monitored by PMUs, active and reactive powers are considered as inequality constraints, with lower and upper limits defined by percentage factors, assuming uncertainties over daily load curves and harmonic components to be estimated in regular time intervals. The optimization problems are solved using the modified safety barrier interior point method, in which the optimal solution is provided with no constraints violation, by the introduction of a relaxation parameter which allows the upper and lower bounds of the constraints which reached their corresponding limits to be relaxed in such a way that the optimal solution is obtained. Three-phase electrical distribution test systems, with radial topology are used for the validation of the proposed methodology. Sensitivity analysis are considered in order to evaluate computational time, distributed generation, harmonic filter and parameters used by the proposed algorithm. Advantages of this work include limited number of PMUs to be installed, multiple harmonic sources identification, estimation of daily load curves and harmonic components along the time, with reduced estimation errors.
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Tavano, Matteo. "Seismic response of tank-fluid systems: state of the art review and dynamic buckling analysis of a steel tank with the added mass method." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3006/.
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Le, Gall Thierry. "La poétique du voile de Fra Angelico à Nicolas Poussin." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM3100.
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Les voiles du Sacrifice d’Iphigénie de Timanthe et du Rideau de Parrhasios problématisent le regard antique et font naître un au-delà qui stratifie la représentation. Le silence qu’ils introduisent dans l’image génère une activité « phantastique » fondatrice d’une poéticité visuelle. La Pala di San Marco adapte à un espace pictural unifié la structure du Tabernacle des Linaioli déjà empruntée au Tabernacle mosaïque. Séparant des espaces de sacralité croissante qui font écho à la lecture exégétique en vigueur au Couvent, les voiles y épaississent l’espace et le sens de l’œuvre, exigeant à chaque étape une transformation du regard. L’exégèse identifiant Marie à l’Arca Dei, le XVe siècle développe autour d’elle diverses formules tabernaculaires susceptibles d’annexer l’espace profane du spectateur. Au fond des Annonciations du Quattrocento le voile révélait le thalamus virginis, ventre métonymique de la Vierge. Cette symbolique s’effrite quand la scénographie se charge de l’évocation du Mystère. Le voile prend des accents métapicturaux ou révèle le vulgaire, la vanité, l’intime, la chair. Il les sacralise alors comme il avait sacralisé l’Arca Dei ou la figure de l’empereur. Aléatoire, il ouvre les œuvres à de surprenantes transgressions, comme l’érotisation des Virgo lactans. Les métaphores visuelles se multipliant pour évoquer ce qui pose problème à la représentation, le voile finit par prendre en charge l’image de ce qu’il cache. L’émergence du caché s’assume comme projet de l’œuvre. Contournant le précepte albertien, ce commerce avec l’invisible relie le motif à l’antique approche, ravivée par La Pléiade, d’une poésie qui n’a d’autre raison que d’en-visager l’ineffableVeils in Sacrifice of Iphigenia by Timanthes and Curtain by Parrhasius signify a problematisation of the Antiquity’s gaze and engender a hereafter which stratifies representation. The silence these works introduce within the image generates a phantastic activity, the founding basis of a visual poetry.Pala di San Marco adapts to a unified pictorial space the structure of Tabernacolo dei Linaioli already borrowed from the Tabernacle of Moses. Separating spaces of increased sacredness and in accordance with the exegetic reading, veils thicken the space and the meaning of the masterpiece, demanding at each stage a transformation of the viewers’ gaze.The exegesis identifying Marie to Arca Dei, the 15th century develops around her numerous forms which are epigones of the Tabernacle’s and become liable to encompass the viewer’s profane space. Deep within Annunciations of the Quattrocento, the veil revealed the thalamus virginis, metonymical belly of the Virgin Mary. This symbolism becomes eroded when the stage design evokes Mystery. The veil conveys metapictorial allusions or reveals vanity, intimacy, flesh. It « sacralizes » them as it did of Arca Dei or of the emperor. Unpredictably, all works become opened up to surprising transgressions, such as the eroticisation of Virgo lactans. Multiple visual metaphors alluding to what is problematic about representation, the veil supports the image of what it is hiding. The surfacing of the concealed becomes the artwork in itself. Skirting around Alberti’s precepts, this trade with the invisible connects the motif with the ancient concept, revived by La Pléiade, of a poetry whose motive is no other than to en-visage the ineffable
Books on the topic "Curtis stage"
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Curtis, Edward S. Edward Sheriff Curtis: The North American Indian : exhibition in the Göttinger State and University Library. Göttingen: Niedersächsische Staats- und Universitätsbibliothek, 2004.
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Shannon, Lowry. Natives of the far North: Alaska's vanishing culture in the eye of Edward Sheriff Curtis. Mechanicsburg, PA: Stackpole Books, 1994.
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1950-, Gura Philip F., ed. Buried from the world: Inside the Massachusetts State Prison, 1829-1831 : the memorandum books of the Rev. Jared Curtis. Boston: Massachusetts Historical Society, 2001.
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Gurshtein, Ksenya, and Simonyi, eds. Experimental Cinemas in State Socialist Eastern Europe. NL Amsterdam: Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789462982994.
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Was there experimental cinema behind the Iron Curtain? What forms did experiments with film take in state socialist Eastern Europe? Who conducted them, where, how, and why? These are the questions answered in this volume, the first of its kind in any language. Bringing together scholars from different disciplines, the book offers case studies from Bulgaria, Czech Republic, former East Germany, Hungary, Poland, Romania, and former Yugoslavia. Together, these contributions demonstrate the variety of makers, production contexts, and aesthetic approaches that shaped a surprisingly robust and diverse experimental film output in the region. The book maps out the terrain of our present-day knowledge of cinematic experimentalism in Eastern Europe, suggests directions for further research, and will be of interest to scholars of film and media, art historians, cultural historians of Eastern Europe, and anyone concerned with questions of how alternative cultures emerge and function under repressive political conditions.
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Commission, Monopolies and Mergers. Avenir Havas Media SAand Brunton Curtis Outdoor Advertising Ltd: A report on the acquisition by Avenir Havas Media SA of Brunton Curtis Outdoor Advertising Ltd : presented to Parliament by the Secretary of State for Trade and Industry by command of Her Majesty,November 1991. London: H.M.S.O., 1991.
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Dennison, A. L. Should state DOTs prefer bicycle lanes or wide curb lanes? Phoenix, Ariz: Arizona Dept. of Transportation, 2008.
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Dennison, A. L. Should state DOTs prefer bicycle lanes or wide curb lanes? Phoenix, Ariz: Arizona Dept. of Transportation, 2008.
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Sipari d'Italia: Memorie municipali e cronache risorgimentali nei teatri dell'Ottocento. Perugia: Futura Edizioni, 2012.
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space), Abattoirs (Exhibition. Pablo Picasso: Rideau de scène pour le Théâtre du Peuple, dit Rideau de scène pour Le Quatorze-juillet de Romain Rolland. La dépouille du Minotaure en costume d'arlequin. [Exposition Picasso, organisée par Les Abattoirs à l'occasion de son ouverture au public en octobre 1999]. Milan: Skira, 1998.
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California State University, Long Beach. University Art Museum. Framing four decades: The University Art Museum celebrates the collections 1949-1989 : August 25-October 29, 1989 : an exhibition presented on the occasion of the inauguration of the fourth president, Curtis L. McCray, and the fortieth anniversary of California State University, Long Beach. [Long Beach]: University Art Museum, 1989.
Find full textBook chapters on the topic "Curtis stage"
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Berger, Toby, and James W. Mandell. "Bounds on the Efficiency of Two-Stage Group Testing." In Codes, Curves, and Signals, 213–32. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5121-8_16.
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Louwen, Atse, and Martin Junginger. "Deriving Experience Curves and Implementing Technological Learning in Energy System Models." In The Future European Energy System, 55–73. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60914-6_4.
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AbstractTechnological learning encompasses a variety of mechanisms by which technologies improve and decrease in costs. Experience curves are commonly used to analyze and explicitly quantify technological learning. This chapter presents the history and basic methodology of experience curves, and discusses the implementation of experience curves in energy system and sectoral energy models. Several key results of the REFLEX project with respect to state-of-the-art experience curves, and the implementation of experience curves in the REFLEX Energy Modeling System are highlighted. Finally, a set of key lessons learned in the REFLEX project are presented, discussing both methodological issues of experience curves as well as key issues with regard to the implementation of experience curves in different types of energy system and sectoral energy models.
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Mancuso, Antonio, Antonio Saporito, and Davide Tumino. "Parametric Hull Design with Rational Bézier Curves." In Lecture Notes in Mechanical Engineering, 221–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_36.
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AbstractIn this paper, a tool able to support the sailing yacht designer during the early stage of the design process has been developed. Quadratic and cubic Rational Bézier curves have been selected to describe the main curves defining the hull of a sailing yacht. The adopted approach is based upon the definition of a set of parameters, say the length of water line, the beam of the waterline, canoe body draft and some dimensionless coefficients according to the traditional way of the yacht designer. Some geometrical constraints imposed on the curves (e.g. continuity, endpoint angles) have been conceived aimed to avoid unreasonable shapes. These curves can be imported in any commercial CAD software and used as a frame to fit with a surface. The algorithm and the related Graphical User Interface (GUI) have been written in Visual Basic for Excel. To test the usability and the precision of the tool, two sailboats with different characteristics have been replicated. The rebuilt version of the hulls is very close to the original ones both in terms of shape and dimensionless coefficients.
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Barauskas, Andrius, Agnė Brilingaitė, Linas Bukauskas, Vaida Čeikutė, Alminas Čivilis, and Simonas Šaltenis. "Semi-synthetic Data and Testbed for Long-Distance E-Vehicle Routing." In New Trends in Database and Information Systems, 61–71. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85082-1_6.
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AbstractElectric and autonomous mobility will increasingly rely on advanced route planning algorithms. Robust testing of these algorithms is dependent on the availability of large realistic data sets. Such data sets should capture realistic time-varying traffic patterns and corresponding travel-time and energy-use predictions. Ideally, time-varying availability of charging infrastructure and vehicle-specific charging-power curves should be included in the data to support advanced planning.We contribute with a modular testbed architecture including a semi-synthetic data generator that uses a state-of-the-art traffic simulator, real traffic distribution patterns, EV-specific data, and elevation data to generate time-dependent travel-time and energy-use weights in a road-network graph. The experimental study demonstrates that the testbed can reproduce travel-time and energy-use patterns for long-distance trips similar to commercially available services.
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Muravyeva, Marianna, and Alexander Gurkov. "Law and Digitization in Russia." In The Palgrave Handbook of Digital Russia Studies, 77–93. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42855-6_5.
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AbstractRussian state has been intensively digitalizing in past decades. The “Electronic Government” program has achieved impressive results in moving legal processes and services online by creating a system of digital platforms to manage individuals’ and businesses’ access to justice (such as services Moi Arbitr or GAS Pravosudie), as well as offer other legal instruments (such as legal documents in digital form). However, these achievements have come at significant cost for law, the legal system, and public entities and private individuals, especially in a situation of authoritarian political framework. Firstly, Russian law has become hyperformalized, which is necessary for smooth digital processing. Secondly, electronic justice has increased access to justice and legal services in terms of time efficiency, but also damaged quality and contents of law. Thirdly, digitalization of law has brought a new level of surveillance, censorship, and information controls that was not available before. The law serves as an instrument of political manipulation, which leads to even further formalization of procedures and uses of e-justice to curtail freedoms of speech and other human rights.
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Garrett, Steven L. "Attenuation of Sound." In Understanding Acoustics, 673–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_14.
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Abstract We will capitalize on our understanding of thermoviscous loss to develop an understanding of the attenuation of sound waves in fluids that are not influenced by proximity to solid surfaces. Such dissipation mechanisms are particularly important at very high frequencies and short distances (for ultrasound) or very low frequencies over geological distances (for infrasound). The Standard Linear Model of viscoelasticity introduced the nondimensional frequency, ωτR, that controlled the medium’s elastic (in-phase) and dissipative (quadrature) responses. Those response curves were “universal” in the sense that causality linked the elastic and dissipative responses through the Kramers-Kronig relations. That relaxation-time perspective is essential for attenuation of sound in media that can be characterized by one or more relaxation times related to those internal degrees of freedom that make their equation of state a function of frequency. Examples of these relaxation-time effects include the rate of collisions between different molecular species in a gas (e.g., nitrogen and water vapor in air), the pressure dependence of ionic association-dissociation of dissolved salts in sea water (e.g., MgSO4 and H3BO3), and evaporation-condensation effects when a fluid is oscillating about equilibrium with its vapor (e.g., fog droplets in air or gas bubbles in liquids).
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Rode, Alan K. "Victory Garden." In Michael Curtiz. University Press of Kentucky, 2017. http://dx.doi.org/10.5810/kentucky/9780813173917.003.0026.
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During the war years, Curtiz interspersedhis long hours at the studio with relaxation at the Canoga Ranch.Hal Wallis and Jack Warner had their final falling-out, and Wallis left the studio in April 1944.He set up a production company at Paramount and wooed Curtiz to join him. Curtiz remained loyal to the Warners, but he began making plans for his own independent company. Feeling liberated from Wallis’s oversight, Curtiz directedRoughly Speaking.Mildred Pierce became one of Curtiz’s classic films as he teamed up with the producer Jerry Wald to resurrect Joan Crawford’s career with an Oscar-winning performance.Night and Day was a musical biopic of Cole Porter that pitted Curtiz against itsstar,Cary Grant, who attempted to manage every detail of the production. Despite Grant’s interference, the picture became a huge box-office hit and set the stage for Curtiz to establish his own production company on the Warner lot as World War II came to a triumphant end.
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Rode, Alan K. "Actor to Director." In Michael Curtiz. University Press of Kentucky, 2017. http://dx.doi.org/10.5810/kentucky/9780813173917.003.0002.
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Kertész graduated from the Royal Academy of Theater and Art as an actor in 1906.Despite experiencing success onstage in provincial Hungary and in Budapest, he was unfulfilled as an actor and gravitated toward direction. It was the dawn of the new era of Hungarian cinema. Kertész quickly grasped that film was a medium that expanded the limitations of the stage. Because of a fortunate circumstance, he ended up directing the first Hungarian dramatic film,Today and Tomorrow. Kertész traveled to Denmark and acted in and became an assistant to the director August Blom on Atlantis (1913), an early European epic.He returned to Hungary and transitioned to film direction permanently. Articles written by Kertész in early Hungarian movie magazines are quoted.
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Rode, Alan K. "The Swash and the Buckler." In Michael Curtiz. University Press of Kentucky, 2017. http://dx.doi.org/10.5810/kentucky/9780813173917.003.0022.
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Curtiz directed The Sea Hawk, an epic swashbuckler starring Errol Flynn. Shot on the studio’s Stage 21, which could be flooded with water and included two hydraulically operated ship sets, the picture was personally crafted by Curtiz, who shot unauthorized action scenes instead of relying on stock footage that Hal Wallis wanted to use. The picture was a smash, although Flynn had become increasingly upset about his typecasting and working with Curtiz. Also explored is a famous Curtiz anecdote that illustrates the director’s total focus on realism and disregard for the safety of performers. After a whirlwind trip to New York City, Curtiz directed the notoriously inaccurate Santa Fe Trail, with Flynn and de Havilland, and an outstanding version of Jack London’s The Sea Wolf, starring Edward G. Robinson, Ida Lupino, and John Garfield. Curtiz and Flynn had a final falling-out during Dive Bomber, a Technicolor tribute to the aerial navy. Flynn physically attacked the director, and the pair never worked together again.Although bereft of Warner’s top male star, Curtiz would move on to his greatest films as World War II began.
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Rode, Alan K. "Hungarian in the Promised Land." In Michael Curtiz. University Press of Kentucky, 2017. http://dx.doi.org/10.5810/kentucky/9780813173917.003.0010.
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Curtiz arrived in New York City via the ocean liner Leviathan on June 10, 1926; the story that his ship docked on July 4 and he thought the holiday fireworks were a celebration of his American arrival was a PR fiction that would be repeated for decades by Warner, Hal Wallis, and Curtiz. Curtiz arrived in Hollywood with his treatment of Noah’s Ark, but instead Jack Warner assigned him a crime drama, The Third Degree (1926), based on a 1908 stage play. He scrambled to learn about American criminal procedures by spending time in the L.A. County Jail and having the script translated into Hungarian. He added a great deal of unscripted material to the picture, a harbinger of future strife between him and the studio.As he completed more pictures for Warner Bros., including A Million Bid and The Desired Woman, he began his long association with Darryl F. Zanuck.He also met the screenwriter Bess Meredyth,who would become his second wife. His immigration status proved to be a problem, as it had to be extended each year by Warner Bros. until he could become a legal resident.
Conference papers on the topic "Curtis stage"
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Rashid, Stephen, Matthew Tremmel, John Waggott, and Randall Moll. "Curtis Stage Nozzle/Rotor Aerodynamic Interaction and the Effect on Stage Performance." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91115.
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Curtis, or velocity compounded, stages commonly don’t achieve the same accuracy of performance prediction expected of most other turbine stages. A review of Curtis stage design practices, field wear, and dirt patterns, in conjunction with performance testing and CFD modeling, determined that the nozzle/rotor aerodynamic interaction is far more complex than typical design and performance calculations assume. Understanding this nozzle/rotor interaction is key to obtaining both improved performance, and a more accurate performance prediction. This paper discusses the nature of this interaction, and it’s implications to Curtis stage performance prediction.
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Rodri´guez, J. A., J. Kubiak, J. C. Garci´a, Jose´ A. Segura, F. Sierra, and G. Urquiza. "Numerical Analysis of Crack Propagation and Life Estimation of Curtis Stage Blade of a Steam Turbine." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42554.
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During the operation of a turbomachine the parts most exposed to the alternative forces are the blades. The Curtis stage blades are then subjected to high alternative loads which may cause forced vibrations and these may fracture and fatigue the blades, affecting the integrity of the machine and causing its consequential shut down. In this paper the numerical analysis of crack propagation in Curtis stage blade subject to forced vibrations is presented. A finite element model of the Curtis stage blade was constructed. The natural frequencies, the steady and dynamic stresses were calculated according to life estimation. The stresses due to forced vibration were estimated using the alternative forces based in computed numerical fluid dynamics from a previous study.
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Kraus, Michael H., Michael Deichsel, Peter Hirsch, Frank Opferkuch, and Christoph Heckel. "Hermetic 40-kW-Class Steam Turbine System for the Bottoming Cycle of Internal Combustion Engines." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57805.
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An entirely new 40-kW-class steam turbine prototype has been constructed and successfully tested for more than 6,500 hours. The two-stage Curtis wheel with a nominal pressure ratio of about 130 has been designed for applications in bottoming water/steam cycles. The axial turbine runs at a rated rotational speed of 36,000 rpm, utilizing magnetic bearings and a permanent magnet synchronous generator which is coupled to the grid by frequency inverters. The integral turbine-generator set has been designed as a hermetically sealed assembly group. The turbine design allows both the turbine’s oil supply system and the bottoming cycle’s feed-water treatment system to be eliminated. The turbine has been designed to allow unmanned operation of the entire cycle with minimum maintenance requirements and reduced costs. Extensive turbine testing, including rated power, overload and load rejection tests was carried out to verify functionality. Long-term operational capability was also demonstrated, giving particular attention to generator performance. Exemplarily a bottoming cycle, utilizing the turbine, matching the exhaust conditions of internal combustion engines was designed, increasing electrical efficiency from 40.4% to 43.4%, which represents a relative net improvement of 7.5%. In this application a turbine isentropic efficiency of more than 55% is expected, based on the congruence of measurement and calculation.
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Best, H. G., and M. E. Koss. "Rotor Welding: TVA Experience." In ASME 2008 Power Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/power2008-60035.
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TVA has a fleet of 59 units with 187 large steam fossil turbine rotors, 68 fossil generators, and 27 auxiliary turbine rotors, in-service. The original equipment manufacturers (OEM) rotors have three designs some welded, others are shrunk on disk, but the majority of the rotors are mono-block. TVA has worked with OEM’s, third parties, and with-in TVA to perform weld repairs on rotors. Rotor Problems requiring welding: 1. Journal/gland damage due to lubrication failure and/or wear. 2. Attachment area damage due to cracks or distortion. 3. Attachment area due to changes in design. In the TVA fleet there are approximately 20 rotors that have been welded. Most of these have been successfully operated, but there have been 3 failures of welded rotors that will be discussed. Allen Fossil Plant Unit 3 Intermediate Pressure–Low Pressure Single Flow Turbine Rotor: In 1992 this rotor had a failure of the Curtis Stage. The decision was made to have the rotor welded and change the number of blades. Westinghouse (the OEM) performed the design and weld repair. In 2000 the unit experienced vibration, the unit was disassembled, and the weld repair had failed at the fusion line. An investigation of the failure revealed the weld had not been located at the designed location and the actual location of the weld was in a high stress area. Gallatin Fossil Plant Unit 4 High Pressure Turbine Rotor: TVA designed an upgrade to the Rateau Stage to change from axial entry to a tri-pin attachment. This required the welding of the disk. During welding, with a third party, cracks resulted that extended into the base material. This failed and additional base material was removed before welding. After 8 years of operation the rotor experienced vibration, the unit was inspected, and the weld was found with creep cracks in the heat affected zone (HAZ). An investigation of the failure revealed the expanded weld build-up relocated the HAZ into a high temperature, high stress region of the rotor. Widows Creek Fossil Plant Unit 7 Boiler Feed Pump Turbine Rotor: The rotor experienced stress corrosion cracking (SCC) of the fifth stage during operation in 2003. The rotor was weld repaired and returned to service in 2006. After 5 months of operation the rotor experienced vibration, was inspected, and the welded fifth stage and the sixth stage had experience SCC failures.
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Hristov, Jordan Y., and Venelin Stamatov. "Transient heating of a bio-oil droplet within the pre-explosion stage." In 8th Australasian Heat and Mass Transfer Conference. Curtin University of Technology. Connecticut: Begellhouse, 2005. http://dx.doi.org/10.1615/ichmt.2005.austheatmasstransfconf.100.
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Schmidt, A. R., and B. C. Yen. "Stage-Discharge Rating Curves Revisited." In Hydraulic Measurements and Experimental Methods Specialty Conference (HMEM) 2002. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40655(2002)89.
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Bulda, Oksana. "«Legal Asymmetry»in the Context of Liability of the State and State-Sponsored Cyber Attacks Actors." In Behind the Digital Curtain. Civil Society vs State Sponsored Cyber Attacks. Promote Ukraine, 2019. http://dx.doi.org/10.34054/bdc003.
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Prater, Mark D., Thomas A. Hardy, H. Lee Butler, and Leon E. Borgman. "Estimating Error of Coastal Stage Frequency Curves." In 19th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1985. http://dx.doi.org/10.1061/9780872624382.012.
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Barandiy, Marta. "Behind the digital curtain: A look inside the Russian Information War against the West." In Behind the Digital Curtain. Civil Society vs State Sponsored Cyber Attacks. Promote Ukraine, 2019. http://dx.doi.org/10.34054/bdc001.
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Venherskyi, Petro, and Roman Karpiuk. "Extraction, integration and data processing in the SIEM «SPLUNK»." In Behind the Digital Curtain. Civil Society vs State Sponsored Cyber Attacks. Promote Ukraine, 2019. http://dx.doi.org/10.34054/bdc002.
Full textReports on the topic "Curtis stage"
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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.
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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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Han, Fei, Monica Prezzi, Rodrigo Salgado, Mehdi Marashi, Timothy Wells, and Mir Zaheer. Verification of Bridge Foundation Design Assumptions and Calculations. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317084.
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The Sagamore Parkway Bridge consists of twin parallel bridges over the Wabash River in Lafayette, IN. The old steel-truss eastbound bridge was demolished in November 2016 and replaced by a new seven-span concrete bridge. The new bridge consists of two end-bents (bent 1 and bent 8) and six interior piers (pier 2 to pier 7) that are founded on closed-ended and open-ended driven pipe piles, respectively. During bridge construction, one of the bridge piers (pier 7) and its foundation elements were selected for instrumentation for monitoring the long-term response of the bridge to dead and live loads. The main goals of the project were (1) to compare the design bridge loads (dead and live loads) with the actual measured loads and (2) to study the transfer of the superstructure loads to the foundation and the load distribution among the piles in the group. This report presents in detail the site investigation data, the instrumentation schemes used for load and settlement measurements, and the response of the bridge pier and its foundation to dead and live loads at different stages during and after bridge construction. The measurement results include the load-settlement curves of the bridge pier and the piles supporting it, the load transferred from the bridge pier to its foundation, the bearing capacity of the pile cap, the load eccentricity, and the distribution of loads within the pier’s cross section and among the individual piles in the group. The measured dead and live loads are compared with those estimated in bridge design.