Bibliografie tematiche / 60J05

Letteratura scientifica selezionata sul tema "60J05"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "60J05":

Tichlova, Marissa, Irhamni e Ahmad Munjin Nasih. "Peningkatan Kemampuan Membaca Pemahaman Teks Bahasa Arab pada Siswa MA dengan Metode SQ3R". JoLLA: Journal of Language, Literature, and Arts 1, n. 1 (30 gennaio 2021): 76–89. http://dx.doi.org/10.17977/um064v1i12021p76-89.

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Abstract: The objective of this research is to identify the implementation and the result of SQ3R method in Arabic learning to improve the reading skill of XI 2 students of MA Mambaul Ulum. This research applies Classroom Action Research (CAR) that uses qualitative descriptive approaches. Based on cycle I, it appears that students’ reading skill improves to 44% with the average of 60.05 from 38.8% with the average of 49.00 in the early observation stage. In cycle II, students’ reading skill improves significantly at 27.8% from cycle I. The result of the research shows that the implementation of SQ3R Method in learning Arabic has improved students’ reading skill. Keywords: Arabic, reading, SQ3R method Abstrak: Tujuan penelitian ini mendeskripsikan pelaksanaan serta hasil belajar metode SQ3R pada pembelajaran bahasa Arab untuk meningkatkan kemampuan membaca pemahaman siswa Kelas XI 2 MA Mambaul Ulum. Penelitian ini menggunakan rancangan penelitian tindakan kelas (PTK) yang menggunakan pendekatan deskriptif kualitatif. Berdasarkan siklus I, diketahui bahwa kemampuan membaca siswa meningkat menjadi 44% dengan rata-rata 60,05 dari data nilai observasi awal yang hanya 38,8% dengan rata-rata 49,00. Pada siklus II, kemampuan membaca siswa mengalami peningkatan signifikan, yakni 27,8% siklus I. Hal ini menunjukan bahwa penerapan metode SQ3R dalam pembelajaran bahasa arab dapat meningkatkan kemampuan membaca pemahaman siswa. Kata kunci: bahasa Arab, membaca, metode SQ3R

Li, Bo, Jun Yang, Xiao Min Wang, Pei Xian Qiu, Shu Fang Zhang e Qiang Jia. "The Reach on the Salt Spray Corrosion of 6000 Series Aluminum Alloys for the High-Speed Trains". Applied Mechanics and Materials 456 (ottobre 2013): 447–50. http://dx.doi.org/10.4028/www.scientific.net/amm.456.447.

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In this study, we conducted salt spray corrosion test of 6005, 6082 aluminum, we can evaluate the salt spray corrosion performance of 6 series aluminum through the comparison of sample mass of different days before and after the experimental, the observation of the microstructure of the specimen as well as the analysis of corrosion products, etc. The experimental results showed that: 6 aluminum alloy corrosion is sensitive to salt spray corrosion , the degree of 6005,6082 aluminum corrosion increases with the increasing of etching time, but Substantially, corrosion rate increases with etching time in the beginning and then decreases . In the beginning the etching degree of corrosion of 6005 is less than 6082, with the etching time, the etching degree of corrosion of 6005 is greater than 6082 in the mid, and the etching degree of corrosion of 6082 is greater than 6005 in the last.

Rosalsky, Andrew. "On the Limiting Behavior of a Random Walk". Calcutta Statistical Association Bulletin 43, n. 1-2 (marzo 1993): 1–11. http://dx.doi.org/10.1177/0008068319930101.

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Yoiprommarat, Seangaroon, Panida Unagul, Rapheephat Suvannakad, Anupong Klaysuban, Satinee Suetrong e Taridaporn Bunyapaiboonsri. "Eremophilane sesquiterpenes from the mangrove fungus BCC 60405". Phytochemistry Letters 34 (dicembre 2019): 84–90. http://dx.doi.org/10.1016/j.phytol.2019.09.005.

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Allen, Norman S. "Book Review: Light Harvesting NanoMaterials, Bentham e-Books, ISBN: 978-1-60805-959-1; e-ISBN: 978-1-60805-958-4". Open Materials Science Journal 9, n. 1 (26 giugno 2015): 49. http://dx.doi.org/10.2174/1874088x01509010049.

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Light Harvesting NanoMaterials, Bentham e-Books, ISBN: 978-1-60805-959-1;e- ISBN: 978-1-60805-958-4 Edited by Surya Prakash Singh The harvesting, capture and efficient conversion of solar light energy into electrical and heat energy through chemical and structural materials is now a rapid and exciting field of significant advancement and investigation in the scientific world. Many of these novel and often complex materials can attain important developments for many industrial outlets in energy transformation from solar power. This book targets a number of key newly developed nano-materials and consists in total of five chapters each one compiled by authors who are experts in that particular field and is edited by Surya Prakash Singh. The book consists of a number of important topics many developmental in the fields of organic/polymeric nano-materials which brings the reader up-to-date on many important features. The first chapter covers recent investigations covering the inter-locking and embedding of inorganic transistion metal compound based nano-particles onto solar panel surfaces as anti-reflective coatings in order to enhance light absorption characteristics for effective energy conversion. Silicon, titanium and silver compounds in various nano-formats are highlighted. Here the properties of the particles in harvesting light energy as a support and their photochemistry provides many important answers to questions in relation to the efficiencies of energy harnessing. The efficiencies of these processes is examined practically and theoretically in some depth with many very well illustrated devices. Silver nano-particles were particularly valuable and effective in this regard for enhancing solar energy absorption. Nano-crystalline titanium dioxide is a widely investigated material for solar energy harnessing but its inefficiency in absorption like many materials is a major deficiency. In chapter two, the use of doped titanias utilising tetrapyrolic sensitisers and various metal complexes for overcoming this problem is reviewed. Here, the deficiencies of usual ruthenium complexes is superseded via more effective porphyrins, phthalocyanines and corroles and with enhanced coupling i.e. via zinc significant energy conversions may be achieved. The next chapter explores the behavior and properties of polymeric materials as matrices for nano-composites where again energy efficiency conversion is crucial in determining the role of the light induced physic-chemicalprocesses. In this case the design of polymer based nanocomposites is widely assessed and is proving to be one of the most interesting and upcoming fields in solar energy harnessing. Of course, one major setback in this area with organo-materials is durability. In chapter four, one rather interesting area of growing interest in utilising solar energy is that dealing with gold and titania nanoparticles called “plasmonic photocatalysts”. This important field has direct relevance to photo-induced electrical and semiconductor processes aswell as significance in the manufacture of photoelectrochemical catalysts due to their broad visible absorption characteristics and hence high efficiency. In this context, the formulation and properties of the various catalysts can result in the production of novel highly active material complexes with high efficacy for oxidation of organic compounds. In the last chapter C60-based solar cells with copper oxides, CuInS2, phthalocyanines, diamond, porphyrin and exciton-diffusion blocking layers have been fabricated and characterized for use in energy efficient solar cell construction. High efficiencies are observed in all these devices when utilized with C60. To summarize, this important edited text provides the reader with a highly useful and valuable source of scientific information which focuses on many important aspects of development in light energy harvesting processes in both fields of photochemistry and photophysics thus providing many valuable ways forward for further scientific development for the future in solar energy conversion and photocatalysis. It makes interesting reading coupled with many new ideas and is very well illustrated and certainly provides a valuable reference source for chemists, physicists, biologists and engineers working in the field in both academia, government and industry, alike.

Kim, W. H., H. H. Cho, J. H. Cha, S. I. Kwun e Dong Hyuk Shin. "Effects of Equal Channel Angular Pressing and Heat Treatment on Low Cycle Fatigue Properties of 6005 Al Alloy". Key Engineering Materials 385-387 (luglio 2008): 721–24. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.721.

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The effects of equal channel angular pressing (ECAP) and subsequent heat treatment on the low cycle fatigue properties of 6005 Al alloy were investigated. The ECAPed specimens showed cyclic softening, whereas the peak aged specimens showed cyclic hardening at all strain amplitudes. After ECAP, artificial aging was performed at 175°C to observe the change of the low cycle fatigue properties due to precipitation. The fatigue life and behavior of the unECAPed and ECAPed 6005 Al alloys were discussed in terms of the microstructural changes and aging conditions.

Shen, Lin, Hui Chen, Xiaoli Che e Lidong Xu. "Corrosion–fatigue crack propagation of aluminum alloys for high-speed trains". International Journal of Modern Physics B 31, n. 16-19 (26 luglio 2017): 1744009. http://dx.doi.org/10.1142/s021797921744009x.

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A modified single-edge notch tension (SENT) specimen exposed to saline environment was utilized to investigate the corrosion–fatigue crack growth behaviors of 5083, 6005 and 7N01 aluminum alloys. The fatigue crack propagation life, corrosion–fatigue crack rate ([Formula: see text]) were tested. The microstructures and fracture surfaces of specimens were examined by optical microscopy and scanning electron microscopy (SEM). The results showed that fatigue crack propagation rate of 7N01 in 3.5% NaCl was significantly higher than 6005 and 5083 alloys. The mechanisms of anodic dissolution and hydrogen embrittlement are used to explain the results.

Tang, Rong, e Yi Xuan Dong. "The Proof of Strong Markov Property Based on one Definition". Applied Mechanics and Materials 742 (marzo 2015): 419–28. http://dx.doi.org/10.4028/www.scientific.net/amm.742.419.

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In this paper, for countable homogeneous Markov process, we prove strong Markov property defining by [2] are valid. So for an arbitrary countable homogeneous Markov process is a strong Markov process.2000 Mathematics Subject Classification. Primary 60J25, 60J27.

Bajor, Teresa, Anna Kulakowska e Henryk Dyja. "Analysis of the Rolling Process of Alloy 6005 in a Three-High Skew Rolling Mill". Materials 13, n. 5 (3 marzo 2020): 1114. http://dx.doi.org/10.3390/ma13051114.

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This paper presents the results of numerical modelling of the rolling process of aluminum alloy bars in a three-high skew mill. The purpose of the examination was to determine the optimal rolling temperature for this alloy. The numerical examination for aluminum alloy 6005 (AlZn5.5MgCu) was performed using the Forge3®-2D Plane strain state commercial software. The rheological properties of the examined alloy were determined from uniaxial compression tests done using the metallurgical process simulation system Gleeble 3800. The numerical analysis of the process of rolling 6005 alloy bars in a three-high skew mill was conducted within the temperature range of 150–350 °C and at a deformation of 0.29.

Røyset, Jostein, Tore Stene, Jan Anders Sæter e Oddvin Reiso. "The Effect of Intermediate Storage Temperature and Time on the Age Hardening Response of Al-Mg-Si Alloys". Materials Science Forum 519-521 (luglio 2006): 239–44. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.239.

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Specimens of three Al-Mg-Si alloys, 6060, 6005 and 6082, were solution heat treated, stored at different temperatures for different time, and artificially aged. Properties were measured before and after artificial ageing. The natural ageing response of the alloys is dependent on the storage temperature. Decreasing storage temperature leads to a delayed onset of natural ageing, but also to a higher strength after prolonged ageing, particularly for lean alloys such as 6060. The temperature and time of intermediate storage between solution heat treatment and artificial ageing has a significant effect on the strength of the artificially aged material. For the 6005 and 6082 alloys the processes that take place during natural ageing lead to a reduced strength after artificial ageing.

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Tesi sul tema "60J05":

Miller, Melinda G. "Action for change? Embedding Aboriginal and Torres Strait Islander perspectives in early childhood education curricula". Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60905/5/60905.pdf.

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This thesis focuses on non-Indigenous educators’ work around embedding Indigenous perspectives in early childhood education curricula. In place of reporting examples of ‘good’ educational practice, the study questions how whiteness and racism continue to operate in diversity work that is seen to be productive and inclusive. The thesis argues for a more comprehensive framework for embedding Indigenous perspectives in before-school contexts to support educators’ efforts. New strategies for professional development are also suggested to support changes in disciplinary knowledge and pedagogy.

Bonfitto, Guilherme Bruno Barroso. "Estudo do comportamento da liga Al-Mg-Si 6005 A solubilizada e envelhecida". Universidade Presbiteriana Mackenzie, 2016. http://tede.mackenzie.br/jspui/handle/tede/3208.

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Submitted by Rosa Assis (rosa_assis@yahoo.com.br) on 2017-04-10T12:03:21Z No. of bitstreams: 2 Guilherme Bruno Barroso Bonfitto.pdf: 4296266 bytes, checksum: 5092519d6b5bf1138c9d85efce8d53c4 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Approved for entry into archive by Paola Damato (repositorio@mackenzie.br) on 2017-04-20T15:36:43Z (GMT) No. of bitstreams: 2 Guilherme Bruno Barroso Bonfitto.pdf: 4296266 bytes, checksum: 5092519d6b5bf1138c9d85efce8d53c4 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Made available in DSpace on 2017-04-20T15:36:43Z (GMT). No. of bitstreams: 2 Guilherme Bruno Barroso Bonfitto.pdf: 4296266 bytes, checksum: 5092519d6b5bf1138c9d85efce8d53c4 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-08-09
The possibility of increase use of aluminum in place of ferrous materials and wood in automotive industry, mainly in manufacturing of bus and truck structure, corrosion resistance, high ratio resistance and weight due low density and cost are the main reasons for this study. The alloy 6005A without any heat treatment appears disadvantageous compared to other alloys of aluminum and ferrous materials, however, with appropriate heat treatment, the mechanical properties are improved considerably, which is the case of this study. After comparisons in 36 different conditions of temperature of solubilization and temperature and time of artificial aging, the temperatures of 545ºC (30 minutes followed by water cooling) and 185°C (4 hours) solubilizing and artificial aging, respectively, showed the best growth of hardness alloy 63HRF to 85HRF. The metallography alloy after quenching was performed by optical microscopy showed in the microstructure equiaxed grains with homogeneous distribution. When compared the microstructures with different oven time and temperature, it was not showed the difference that relates the difference in hardness. It was realized the tensile test and the tensile strength limit values (σt) 279,21MPa and yield strength (σe) 257,33 MPa are among the average values for the alloy 6005A T6. The study of fatigue alloy was realized in a rotating bending testing machine (R=-1) at ambient temperature and the data was analyzed in a S-N curve. When applied stress less than 117,42 MPa, the specimen supported more than 1,0x107 cycles before breaking down. The fracture surfaces of the specimens with many tensile were analyzed by optical microscopy and by SEM and indicated the presence of ratchet marks, stretch marks, and integranular and transgranular cracks.
A possibilidade de crescimento da utilização do alumínio em substituição aos materiais ferrosos e de madeira no ramo automobilístico, principalmente na fabricação de carrocerias de ônibus e caminhão, resistência à corrosão, elevada razão resistência e peso devido a baixa massa específica e custo são as principais justificativas para este estudo. A liga 6005A sem nenhum tratamento térmico se apresenta desvantajosa em relação às demais ligas de alumínio e materiais ferrosos, porém, com o tratamento térmico adequado, suas propriedades mecânicas são aperfeiçoadas consideravelmente, que é o caso deste estudo. Após comparações em 36 condições distintas de temperatura de solubilização e temperatura e tempo em forno de envelhecimento artificial, as temperaturas de 545ºC (30 minutos seguido de resfriamento em água) e 185ºC e (4 horas) de solubilização e envelhecimento, respectivamente, foram as que apresentaram melhor incremento de dureza da liga de 63HRF para 85HRF. A metalografia da liga após têmpera foi realizada por microscopia óptica e apresentou na microestrutura grãos equiaixiais com distribuição homogênea. Quando comparada as microestruturas com tempos e temperatura distintas em forno, não foi visto nenhuma diferença que relacionasse a diferença da dureza. Realizado o ensaio de tração e os valores de limite resistência a tração (σt) de 279,21MPa, limite escoamento (σe) de 257,33 MPa estão entre os valores médios para a liga 6005A T6. O estudo de fadiga da liga foi realizado em uma máquina fadiga flexo-rotativa de ciclo reverso tensão-compressão (R=-1) à temperatura ambiente e os dados analisados em uma curva S-N. Com tensão de até 117,42 MPa, o corpo de prova suportou número de ciclos maior que 1,0x107 ciclos antes de romper. As superfícies de fratura dos corpos de prova com cargas variadas foram analisados através de microscopia ótica e pelo MEV e indicaram presença de marcas de catraca, estrias, clivagem e trincas integranulares e transgranulares.

Karagulyan, Avetik. "Sampling with the Langevin Monte-Carlo". Electronic Thesis or Diss., Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAG002.

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L’échantillonnage des lois aléatoires est un problème de taille en statistique et en machine learning. Les approches générales sur ce sujet sont souvent divisées en deux catégories: fréquentiste vs bayésienne. L’approche fréquentiste corresponds à la minimisation du risque empirique, c’est à dire à l’estimation du maximum vraisemblance qui est un problème d’optimisation, tandis que l’approche bayésienne revient à intégrer la loi postérieure. Cette dernière approche nécessite souvent des méthodes approximatives car l’intégrale n’est généralement pas tractable. Dans ce manuscrit, nous allons étudier la méthode de Langevin, basée sur la discrétisation de l’EDS de Langevin. La première partie de l’introduction pose le cadre mathématique et l’intérêt d’étudier plus avant la question de l'échantillonnage. La suite de l’introduction s’attache à la présentation des méthodes d’échantillonnage.Le premier article concerne les bornes non-asymptotiques sur la convergence en distance de Wasserstein de Langevin Monte-Carlo pour les fonctions de potentiel lisses et fortement convexes. Nous établissons d’abord des bornes explicites pour LMC avec des step-sizes variantes?. Puis nous étudions la convergence pour des fonctions de potentiel avec des gradients stochastiques. Enfin, deux types de discrétisation sont présentés, pour les potentiels plus réguliers.Dans la deuxième article nous abordons le problème d’échantillonnage de loi log-concave (pas fortement) en utilisant LMC, KLMC et KLMC2. Nous proposons une pénalisation quadratique constante de la fonction de potentiel. Puis nous prouvons des bornes non-asymptotiques sur l’erreur de Wasserstein de ces méthodes pour le choix de pénalisation optimale. Enfin, nous soulignons l’importance du choix de l’échelle pour le mesurage des complexités des différentes méthodes.La troisième contribution principales est concentrée sur la convergence de la diffusion de Langevin dans le case log-concave. Une pénalisation variable dans le temps est proposée pour la fonction de potentiel. Nous prouvons des bornes explicites pour cette méthode nommée Penalized Langevin Dynamics. A la fin, le lien entre les algorithmes de Langevin et l’optimisation convexe est établi, ce qui nous permet de prouver des bornes similaires pour le gradient flow
Sampling from probability distributions is a problem of significant importance in Statistics and Machine Learning. The approaches for the latter can be roughly classified into two main categories, that is the frequentist and the Bayesian. The first is the MLE or ERM which boils down to optimization, while the other requires the integration of the posterior distribution. Approximate sampling methods are hence applied to estimate the integral. In this manuscript, we focus mainly on Langevin sampling which is based on discretizations of Langevin SDEs. The first half of the introductory part presents the general mathematical framework of statistics and optimization, while the rest aims at the historical background and mathematical development of sampling algorithms.The first main contribution provides non-asymptotic bounds on convergence LMC in Wasserstein error. We first prove the bounds for LMC with the time-varying step. Then we establish bounds in the case when the gradient is available with a noise. In the end, we study the convergence of two versions of discretization, when the Hessian of the potential is regular.In the second main contribution, we study the sampling from log-concave (non-strongly) distributions using LMC, KLMC, and KLMC with higher-order discretization. We propose a constant square penalty for the potential function. We then prove non-asymptotic bounds in Wasserstein distances and provide the optimal choice of the penalization parameter. In the end, we highlight the importance of scaling the error for different error measures.The third main contribution focuses on the convergence properties of convex Langevin diffusions. We propose to penalize the drift with a linear term that vanishes over time. Explicit bounds on the convergence error in Wasserstein distance are proposed for the PenalizedLangevin Dynamics and Penalized Kinetic Langevin Dynamics. Also, similar bounds are proved for the Gradient Flow of convex functions

Sousa, André João Miguel de. "Mixed matrix membranes a new platform for enzymatic reactions /". Enschede : University of Twente [Host], 2009. http://doc.utwente.nl/60605.

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Wigley, Andrew. "Building monuments, constructing communities : landscapes of the first millenium BC in the central Welsh Marches". Thesis, University of Sheffield, 2002. http://etheses.whiterose.ac.uk/6005/.

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This research examines the archaeological sequence from the first millennium BC in the central Welsh Marches. It situates the hillforts of this region within their broader landscape context by considering the practices involved in their construction, and their position within wider networks of routine activity. In order to achieve this, a detailed historiographical account of archaeological work on these monuments is presented. This forms the basis of a series of critically informed interpretations of the later prehistory of this region. My central thesis is that we must consider the landscape as Process if we wish to interpret the nested social relations that operated in this period. This demands that we develop a detailed understanding of the regional context of the practices associated with building and inhabiting the hillforts. As such, we need to explore the patterning and temporality of various forms of activity across the landscape, in order to comprehend how both places and objects were bound up in the reproduction of historically contingent social relations. I will work at different scales with a variety of forms of evidence. I examine the complex human palaeoecology of the region, considering how the structure of the landscape was created and sustained by the building and reworking of these monuments. In doing so, I place the developments we associate with the building of the first hillforts within their historical context. I also address the relationship between the hillforts and other classes of monuments, and how their inhabitation articulated with the creation, use and deposition of various forms of material culture. By moving beyond previous interpretative models, I demonstrate how these monuments became an integral part of the social worlds of the first millennium BC.

Zakari, Mohamed A. B. "The sufficiency and appropriateness of audit evidence obtained by Libyan auditors". Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6005/.

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Siliotto, Matteo. "Valutazione analitica delle aree di delaminazione in materiali compositi avanzati soggetti ad impatti a bassa velocità". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6005/.

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In questo lavoro di tesi è stato elaborato un modello analitico al fine di ottenere una stima dell’ampiezza di delaminazione a seguito di impatti a bassa velocità in laminati in composito, in particolare carbon/epoxy. Nel capitolo 2 è descritto il comportamento meccanico di tali laminati (equazioni costitutive della singola lamina, dell’intero laminato e costanti ingegneristiche dell’intero laminato per qualsiasi sistema di riferimento). Nel capitolo 3 viene descritta la filosofia di progettazione damage tolerance per tali materiali sottoposti a low-velocity impact (LVI) e richiamato il concetto di structural health monitoring. In particolare vengono descritti i tipi di difetti per un laminato in composito, vengono classificati gli impatti trasversali e si rivolge particolare attenzione agli impatti a bassa velocità. Nel paragrafo 3.4 sono invece elencate diverse tecniche di ispezione, distruttive e non, con particolare attenzione alla loro applicazione ai laminati in composito. Nel capitolo 4 è riportato lo stato dell’arte per la stima e la predizione dei danni dovuti a LVI nei laminati: vengono mostrate alcune tecniche che permettono di stimare accuratamente l’inizio del danno, la profondità dell’indentazione, la rottura delle fibre di rinforzo e la forza massima di impatto. L’estensione della delaminazione invece, è difficile da stimare a causa dei numerosi fattori che influenzano la risposta agli impatti: spesso vengono utilizzati, per tale stima, modelli numerici piuttosto dispendiosi in termini di tempo e di calcolo computazionale. Nel capitolo 5 viene quindi mostrata una prima formula analitica per il calcolo della delaminazione, risultata però inaffidabile perché tiene conto di un numero decisamente ristretto di fattori che influenzano il comportamento agli LVI. Nel capitolo 6 è mostrato un secondo metodo analitico in grado di calcolare l’ampiezza di delaminazione mediante un continuo aggiornamento della deflessione del laminato. Dal confronto con numerose prove sperimentali, sembra che il modello fornisca risultati vicini al comportamento reale. Il modello è inoltre fortemente sensibile al valore della G_IIc relativa alla resina, alle dimensioni del laminato e alle condizioni di vincolo. É invece poco sensibile alle variazioni delle costanti ingegneristiche e alla sequenza delle lamine che costituiscono il laminato. La differenza tra i risultati sperimentali e i risultati del modello analitico è influenzata da molteplici fattori, tra cui il più significativo sembra essere il valore della rigidezza flessionale, assunto costante dal modello.

Piras, Francesco <1978&gt. "A new global wheat marketmodel (GLOWMM) for the analysis of wheat export prices". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/6005/.

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Food commodity prices fluctuations have important impacts on poverty and food insecurity across the world. Conventional models have not provided a complete picture of recent price spikes in agricultural commodity markets, while there is an urgent need for appropriate policy responses. Perhaps new approaches are needed in order to better understand international spill-overs, the feedback between the real and the financial sectors and also the link between food and energy prices. In this paper, we present results from a new worldwide dynamic model that provides short and long-run impulse responses of wheat international prices to various real shocks.

Johansen, Arve. "Eksponering for ultrafine partikler (UFP), totalpartikler, polysykliske aromatiske hydrokarboner (PAH) og høyere aldehyder ved steking av flesk (bacon) på elektrisk komfyr og gassbluss". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for industriell økonomi og teknologiledelse, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15056.

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Det har tidligere vært funnet en sammenheng mellom eksponering for stekeos og helseeffekter, spesielt luftveisplager. Det har også blitt identifisert en rekke mutagene og karsinogene komponenter i sekeos, og insidensen av kreft i luftveissystemet har blitt funnet å være høyere enn blant resten av befolkningen (Lund, 1986), (Coggon et al., 1986), (Berg et al., 1988), (Ng et al., 1993), (Notani et al., 1993). IARC (2010) har utalt at PAH og aldehyder er viktige når det gjelder kreft og stekeos. Konsentrasjon av forurensinger i luften som følge av steking kan variere veldig. Hvilke typer forurensing som stekeosen inneholder kan variere ut i fra hva slags type/mengde mat som blir tilberedt og hvilken type/mengde stekeolje/fett som brukes, samt temperatur og tilberedningsmetode. Spesielt viktig er det å unngå brenning av oljen/fettet, da det øker generering av partikler i stor grad (Evans et al., 2008).Alle forsøk ble foretatt i et laboratoriekjøkken i kjelleren på Gamle Fysikk, NTNU, i uke 5, 8 og 10, 2011. I uke 5 ble det stekt lettsaltet sideflesk på elektrisk komfyr, i uke 8 lettsaltet sideflesk på gassbluss og i uke 10 røkt bacon på gassbluss. Forsøkene gikk over tre dager hver uke. Det ble gjennomført 5 stekerunder á 15 min som ble etterfulgt av 25 min pause, totalt 3 timer og 20 minutt. Det ble målt konsentrasjon av PAH, aldehyder og totalpartikler, samt konsentrasjon og størrelsesfordeling til partiklene. Alle målingene ble foretatt i pustesonen til testpersonene. Alt måleutstyr var personbåret, bortsett fra TSI-3936 Scanning Mobility Particle Sizer (SMPS) som ble brukt for å fastslå partikkelkonsentrasjon og størrelsesfordeling. Dette systemet er stasjonært, men målingene ble foretatt via en silikonslange som ble plassert i pustesonen til testpersonen som sto for stekingen. For å utføre stekingen ble det rekruttert tre kvinnelige studenter ved NTNU. Alle testpersonene hadde en dag som ”steker” hver uke. De andre dagene sto de rundt komfyren og var behjelpelig med å legge i og ta av ferdigstekt lettsaltet sideflesk/røkt bacon. Resultatene fra våre forsøk viser generelt at steking av lettsaltet sideflesk/røkt bacon genererer høyere peak-konsentrasjon av partikler enn det som har blitt funnet i andre forsøk med steking av mat (Yeung & To, 2008), (Buonanno et al. , 2009). Imidlertid har steking av oksebiff i soyaolje og margarin blitt vist å kunne generere høyere peak-konsentrasjon av partikler (Sjaastad et al., 2010). I våre forsøk har steking av lettsaltet sideflesk og røkt bacon på gassbluss blitt funnet å generere høyere konsentrasjon av partikler enn steking av lettsaltet sideflesk på elektrisk komfyr. Årsaken til dette er sannsynligvis brenning av gass og brenning av fett/matrester på gassblusset. Partikler generert ved brenning av gass på gassblusset har blitt vist å være kilden til de aller minste partiklene (<14,6 nm). Forskjellen i partikkelkonsentrasjon mellom steking av lettsaltet sideflesk og røkt bacon ved hjelp av gassbluss og steking av lettsaltet sideflesk på elektrisk komfyr er størst for partikler med mobilitetsdiameter på henholdsvis 98,2 og 88,2 nm. I dette størrelsesområdet bidrar partikler generert av gassblusset med en relativt lav partikkelkonsentrasjon som ikke alene kan forklare differansen i partikkelkonsentrasjon mellom bruk av elektrisk komfyr og gassbluss. Sannsynlig forklaring på differansen er en kombinasjon av forbrenning av gass og forbrenning av fett/matrester på gassblusset. For partikler >300 nm er det liten forskjell i partikkelkonsentrasjon mellom bruk av gassbluss og elektrisk komfyr. Brenning av gass på gassblusset bidrar med svært liten konsentrasjon av partikler for så store mobilitetsdiametre.Det registreres at mobilitetsdiameteren ved peak partikkelkonsentrasjon endrer seg med tiden ved bruk av gassbluss. Årsaken til dette er sannsynligvis koagulering. Partikler koagulerer og danner færre, men større partikler. Graden av koagulasjon er avhenger av kvadratet av partikkelkonsentrasjonen (Nazaroff, 2004). Høy partikkelkonsentrasjon kan være årsaken til at vi observerer en forandring i mobilitetsdiameter i våre forsøk med steking av lettsaltet sideflesk/røkt bacon på gassbluss, mens det ikke har vært observert tilsvarende endring i mobilitetsdiameter i lignende forsøk (Dennekamp et al., 2001). Ved bruk av elektrisk komfyr ligger mobilitetsdiameteren stabilt gjennom hele forsøket. Når det gjelder konsentrasjonen av totalpartikler, observeres det at konsentrasjonen er relativt lik ved steking av lettsaltet sideflesk på gassbluss og elektrisk komfyr. Konsentrasjonen av totalpartikler er vesentlig lavere ved steking av røkt bacon på gassbluss, noe som sannsynligvis kan forklares med at det røkte baconet hadde lavere fett- og vanninnhold enn det lettsaltede sideflesket.

Knowlton, Autumn. "Q'eqchi' Mayas and defense of territory : learning through the contentious politics of land in “post-conflict” Guatemala". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60205.

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My study explores how indigenous Q’eqchi’ Mayas in Guatemala draw political cohesion from their cultural relationship to their ancestral territories when responding to violent dispossession by extractive mining corporations and mono-crop agriculture. Drawing upon participant observation and 39 interviews conducted in the municipalities of Panzós and El Estor in 2013 and 2014, my research considers Q’eqchi’s’ defense of territory (defensa del territorio) as a salient, culturally specific collective action that draws continuity from centuries of conflicts over control of land and natural resources in Guatemala. Throughout Spanish colonization, independence, entry into the world capitalist market, and 20th century political upheavals, conflicts over land have featured consistently. In more recent history, the 36-year internal armed conflict (1960-1996) was a focal point of Q’eqchi’ research contributors’ testimony on their longstanding and interminable suffering for their lands. As a result of favorable conditions for international investors since the signing of the 1996 Peace Accords, the Guatemalan government has opened up the country, and indigenous lands in particular, to large-scale investment and development. Based on my findings, and building on Liza Grandia’s (2012) framing of three “conquests” of Q’eqchi’ lands, my study offers the term “fourth conquest” (Knowlton, 2016), a conquest by corporation, to explain the unique conjuncture of forces Q’eqchi’s face today when defending their lands. Their current tactical focus on land titling and juridical certainty is a response to the renewed invasion of extractive corporations into their ancestral territories. Through applying informal and social movement learning theories, this study considers Q’eqchi’s’ political encounters in defense of land as moments of learning which shape them as political actors and subjects. For Q’eqchi’s, land represents the confluence of cultural and spiritual bonds, material sustenance, and struggles to end political marginalization. A study of the labors involved in defense of territory provides valuable insights into the culturally specific learning processes that both structure and result from myriad political interventions into community, municipal, national, and international politics. Q’eqchi’s are strategically forming short and long-term alliances, and adopting identity claims based on indigenous rights, human rights, Guatemalan citizenship, and their cultural ties to their ancestral territory.
Education, Faculty of
Graduate

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Libri sul tema "60J05":

Wooldridge, Michael, Jörg P. Müller e Milind Tambe, a cura di. Intelligent Agents II Agent Theories, Architectures, and Languages. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-60805-2.

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Negro, Gianluigi. The Internet in China. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60405-3.

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Hollander, Justin B. An Ordinary City. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-60705-4.

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Städtler-Mach, Barbara, a cura di. Ethik im Gesundheitswesen. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60205-4.

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Weilemann, L. S., e H. Schinzel, a cura di. Antithrombin — Diagnostik und Therapie. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-60305-1.

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Cornelissen, Scarlett, e Yoichi Mine, a cura di. Migration and Agency in a Globalizing World. London: Palgrave Macmillan UK, 2018. http://dx.doi.org/10.1057/978-1-137-60205-3.

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Sutton, Anna. People, Management and Organizations. London: Macmillan Education UK, 2018. http://dx.doi.org/10.1057/978-1-137-60505-4.

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Laslier, Jean-François. Tournament Solutions and Majority Voting. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60805-6.

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Drescher, Uwe, Andreas Faissner, Rüdiger Klein, Fritz G. Rathjen e Claudia Stürmer, a cura di. Molecular Bases of Axonal Growth and Pathfinding. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60905-3.

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Leitsch, Alexander. The Resolution Calculus. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60605-2.

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Capitoli di libri sul tema "60J05":

Sun, Gang, Pengwei Li, Qingmei Ma, Pilin Cui, Xiangjie Wang, Bo Huang e Jianzhong Cui. "Optimization of 6005 Aluminum Alloy Components". In Lecture Notes in Mechanical Engineering, 315–23. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0107-0_29.

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Kah, Paul, Jukka Martikainen, Esa Hiltunen, Fisseha Brhane e Victor Karkhin. "Hot Cracking Susceptibility of Wrought 6005 and 6082 Aluminum Alloys". In Hot Cracking Phenomena in Welds III, 59–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16864-2_4.

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Posoukidis, Elias. "Eine Tour durch C++". In Klassische Mechanik mit C++, 3–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_1.

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Posoukidis, Elias. "Anfangswertprobleme für gewöhnliche Differenzialgleichungen". In Klassische Mechanik mit C++, 377–412. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_10.

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Posoukidis, Elias. "Interpolation". In Klassische Mechanik mit C++, 413–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_11.

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Posoukidis, Elias. "Eindimensionale Bewegungen". In Klassische Mechanik mit C++, 427–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_12.

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Posoukidis, Elias. "Bewegung in einem Medium mit Reibung". In Klassische Mechanik mit C++, 449–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_13.

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Posoukidis, Elias. "Schwingungen". In Klassische Mechanik mit C++, 467–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_14.

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Posoukidis, Elias. "Klassen in C++". In Klassische Mechanik mit C++, 61–143. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_2.

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Posoukidis, Elias. "Tabellen und Views". In Klassische Mechanik mit C++, 145–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-60905-7_3.

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Atti di convegni sul tema "60J05":

"Performance of Blast Furnace Slag Cement Concrete in Simulated Aggressive Marine Environment". In "SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete". American Concrete Institute, 1998. http://dx.doi.org/10.14359/6005.

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Pedrosa da Silva, Julio Cezar. "Avaliação da dureza do alumínio 6351 e 6005 submetido a diferentes tratamentos". In X Congresso Nacional de Engenharia Mecânica. ABCM, 2018. http://dx.doi.org/10.26678/abcm.conem2018.con18-0540.

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Wetherhold, Robert C., Renee M. Bagwell e Joseph M. McManaman. "Short Shaped Copper Fibers in an Epoxy Matrix: Their Multifunctional Use — Fracture and Impact Toughening and EMI Shielding". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60405.

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Previous research has shown that short shaped copper fibers can significantly increase the fracture toughness of a thermoset matrix composite. This paper considers the effectiveness of adding these same short shaped copper fibers to improve the composite’s impact toughness. Further, the electromagnetic interference (EMI) shielding effectiveness (SE) of these shaped copper fibers will be analyzed. The matrices used in the impact experiments were two different types of epoxy, a low shrinkage epoxy (LS) and a high shrinkage epoxy (HS). Fiber shapes and lengths were chosen based on previous single fiber pullout experiments. The following shaped fibers were used: straight, flat end-impacted, rippled, and end-oxidized. The two fiber lengths tested were 6mm and 10mm. Results indicate that the largest influence on impact toughness is from the matrix fracture behavior. When the matrix failed around the fibers, the impact toughness was significantly less compared to matrices with the same fibers that had a planar fracture at the notch during impact. Fiber end modification and to a lesser extent the fiber length both also had an effect on the fiber pullout behavior and resulting toughness. Comparing the end-modified fibers to straight fibers, the largest increase in impact toughness was 17%. The matrix used for the EMI shielding experiments was HS epoxy and two fiber diameters were tested: 0.325 mm and 0.162 mm. The fiber shapes used in the experiments were: straight, flat end-impacted, rippled, and acid roughened. An EMI SE of > 40 dB at 1.5 GHz was attained using 15vol% of the 0.162 mm diameter shaped fibers. The composites with 15vol% of the 0.325 mm diameter shaped fibers showed poor EMI SE, < 20 dB, due to large fiber diameter that results in a lower skin depth volume and a lower number of fibers which results in a lower number of conducting paths for attenuation through the composite. Results indicate that besides improving the fracture and impact toughness of a thermoset polymer matrix, short shaped copper fibers can also significantly improve the EMI SE of the composite, resulting in a multifunctional material.

Lin, Guosong, Muammer Koc¸, S. Jack Hu e Wayne Cai. "Three-Dimensional Numerical Simulations of Curved Edge-Curved Surface Hemming of Aluminum Alloy". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60705.

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Hemming is a manufacturing process to fold a sheet onto itself or another sheet. The dimensional defects (roll-in/rollout, warp/recoil, distortion due to springback, etc.) of hems critically impact the perceived quality of automotive exteriors. This paper summarizes the procedures and the results of three-dimensional (3D) numerical simulations on curved edge-curved surface hemming of aluminum alloy AA6111-T4PD. A solid-element model is built in ABAQUS using explicit quasi-static finite element (FE) procedure for flanging, pre-hemming and final hemming, and implicit procedure for the corresponding preloading and resulting springback at high simulation cost. Aiming at improving the computational efficiency, various approaches have been taken and tested including using shell elements as alternatives, developing simplified simulation procedure by combining pre- and final hemming in explicit scheme, and further simplification by neglecting intermediate springback analysis. The same conditions are analyzed using shell elements in LS-DYNA, but only final hemming springback is considered. The results of the simplified models are compared with the results of ABAQUS solid-element model with complete procedure. Both accuracy and efficiency of the models are presented and discussed.

Li, Songyang, Dingqu Wang, Wenli Guo e Yueyuan Jiang. "Analysis and Prospect of the Duplex Fuel Pellets of LOWI Type for Water-Cooled Reactors". In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60505.

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The duplex pellets under a “Low-Interact” (LOWI) nuclear fuel design, which consist of an outer enriched annulus and a depleted or natural core, can provide lower center temperature and reduced probability of pellet-clad mechanical interact (PCMI). Analysis and experiments were done in 1970s to examine the benefits and cost of LOWI design for water-cooled reactors. Results showed that the additional economic cost of this design should not be neglected in spite of the benefits. However, due to the improvement of nuclear fuel fabrication technology in the past 30 years, the benefits of LOWI design become more significant, especially when the potential of other methods to elevate the power density and overcome the constraints on ramp rates in power reactors is running out. In order to evaluate the feasibility of deploying the LOWI fuel in commercial and research reactors, neutronics and thermal calculations are made to figure out the performance of duplex UO2 pellets in particular reactors. It is shown that the center temperature of pellet has been greatly reduced without any change on assembly and core geometry, which means the opportunity of less fission gas production, higher power density and more adequate safety margin. A mechanical analysis of a typical LOWI design is also done. The challenges on duplex pellet manufacture are also discussed. Several fabrication techniques are presented to show the potential of cutting the cost of pellet production.

Patel, Maithili, e Manthan Mahajan. "Modeling and Simulation of Vehicle Behavior for Design and Tuning of Electronic Differential for Formula Student Vehicle". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60105.

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A racing vehicle requires to be designed for optimum performance, stability and maneuverability considering all situations like straight line acceleration and high speed cornering. The car is driven close to its tractive limits and a control system becomes inevitable to manifest utmost performance of the car. In this paper, the focus is on design of an electronic differential for a rear wheel driven Formula Student Electric vehicle, with each rear wheel driven by separate motors. The electronic differential (e-diff) is aimed at both straights and corners, which is fulfilled by considering objective parameters, which assist in cornering by improving yaw rate and straights by improving traction. However, in this paper we shall focus on cornering only. The paper looks at various possible control strategies for obtaining desired values of certain parameters and describes in detail implementation of a yaw rate controlled system. A vehicle model is created on MATLAB/Simulink platform to look at changes in vehicle behavior in response to various control strategies. The model consists of vehicle dynamics and driver models developed by the authors. The coupled model simulates the vehicle performance on any given track and provides the variation of required parameters. Iterations are done and the results are used to tune the controller parameters to optimize performance on tight turns and overall lap times at the endurance event at the Formula Student competition.

Memar, Amirhossein H., e Ehsan T. Esfahani. "Human Performance in a Mixed Human-Robot Team: Design of a Collaborative Framework". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60205.

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In a mixed human-robot team, adaptive automation methods can be used based on mental and cognitive states of human operators. Such adaptive behaviors can be designed such that lead to mitigation of human errors and consequently improvement of the task performance. However, real-time estimation of human internal states and their effects on the task performance remained a challenging issue and it has been the focus of many research in the recent years. Several studies have shown the capabilities of physiological feedbacks to assess human states in multi-tasking environments. In this paper, we present the early development of an experimental setup to investigate human physiological data during interaction with a small group of robotic agents. A simulated tele-exploration task is accomplished by participants and their brain activity and eye movements are recorded across the experiment. Statistical analysis are applied on the quantitative metrics to investigate the main effects and correlations between task performance and physiological features.

Manjunatha, Hemanth, Jida Huang, Binbin Zhang e Rahul Rai. "A Sequential Sampling Algorithm for Multi-Stage Static Coverage Problems". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60305.

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It is critical in many system-engineering problems (such as surveillance, environmental monitoring, and cooperative task performance) to optimally allocate resources in the presence of limited resources. Static coverage problem is an important class of the resource allocation problems that focuses on covering an area of interest so that the activities in the area of interest can be detected/monitored with higher probability. In many practical settings (primarily due to financial constraints) a system designer has to allocate resources in multiple stages. In each stage, the system designer can assign a fixed number of resources (agents). In the multi-stage formulation, the agents locations for the next stage are dependent on all the agents location in the previous stages. Such multi-stage static coverage problems are non-trivial to solve. In this paper, we propose a robust and efficient sequential sampling algorithm to solve the multi-stage static coverage problem in the presence of probabilistic resource intensity allocation maps (RIAMs). The agents locations are determined by formulating this problem as an optimization problem in the successive stage . Three different objective functions are compared and discussed from the aspects of decreasing L2 difference and Sequential Minimum Energy Design (SMED). It is shown that utilizing SMED objective function leads to a better approximation of the RIAMs. Two heuristic algorithms, i.e. cuckoo search, and pattern search, are used as optimization algorithms. Numerical functions and real-life applications are provided to demonstrate the robustness and efficiency of the proposed approach.

Mansour, Rami, e Mårten Olsson. "The Response Surface Single Loop Reliability-Based Design Optimization Method With Reliability Requirement on System Failure". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60505.

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In reliability-based design optimization (RBDO), an optimal design which minimizes an objective function while satisfying a number of probabilistic constraints is found. As opposed to deterministic optimization, statistical uncertainties in design variables and design parameters have to be taken into account in the design process in order to achieve a reliable design. In the most widely used RBDO approaches, the First-Order Reliability Method (FORM) is used in the probability assessment. This involves locating the Most Probable Point (MPP) of failure, or the inverse MPP, either exactly or approximately. If exact methods are used, an optimization problem has to be solved, typically resulting in computationally expensive double loop or decoupled loop RBDO methods. On the other hand, locating the MPP approximately typically results in highly efficient single loop RBDO methods since the optimization problem is not necessary in the probability assessment. However, since all these methods are based on FORM, which in turn is based on a linearization of the deterministic constraints at the MPP, they may suffer inaccuracies associated with neglecting the nonlinearity of deterministic constraints. In a previous paper presented by the authors, the Response Surface Single Loop (RSSL) Reliability-based design optimization method was proposed. The RSSL-method takes into account the non-linearity of the deterministic constraints in the computation of the probability of failure and was therefore shown to have higher accuracy than existing RBDO methods. The RSSL-method was also shown to have high efficiency since it bypasses the concept of an MPP. In RSSL, the deterministic solution is first found by neglecting uncertainties in design variables and parameters. Thereafter quadratic response surface models are fitted to the deterministic constraints around the deterministic solution using a single set of design of experiments. The RBDO problem is thereafter solved in a single loop using a closed-form second order reliability method (SORM) which takes into account all elements of the Hessian of the quadratic constraints. In this paper, the RSSL method is used to solve the more challenging system RBDO problems where all constraints are replaced by one constraint on the system probability of failure. The probabilities of failure for the constraints are assumed independent of each other. In general, system reliability problems may be more challenging to solve since replacing all constraints by one constraint may strongly increase the non-linearity in the optimization problem. The extensively studied reliability-based design for vehicle crash-worthiness, where the provided deterministic constraints are general quadratic models describing the system in the whole region of interest, is used to demonstrate the capabilities of the RSSL method for problems with system reliability constraints.

Bompelly, Ravi K., Sai Phani Keerthan Ponduri e Sriharsha Maddila. "Vortex Breakdown and Recirculation Bubble Formation in Counter Swirl Flows". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-60005.

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Abstract For achieving better fuel-air mixing within a short distance or for improved atomization of liquid fuels counter rotating swirler designs are preferred in gas turbine engine combustors. In this study, vortex breakdown phenomenon is investigated in co and counter rotating swirlers using CFD. The swirler assembly consists of two axial swirlers, an inner and an outer swirler both with straight vanes. Swirler vane angles are varied from 30° to 60° in steps of 10° while keeping inner and outer swirler vane angles equal. CFD simulations are performed with air at ambient conditions as the working fluid at a constant mass flow rate. It is observed that strong shear layers are created in counter swirl flows due to the opposite flow rotation. The shear layers result in rapid decay of inner swirler tangential velocities for the counter swirlers compared to the co-swirlers. The tangential velocity decay is characterized with a parameter named tangential velocity integral (TVI). TVI was observed to decay faster for the counter swirl flows compared to the co-swirl flows. The faster decay in TVI for the counter swirlers is found to result in a stronger adverse pressure gradient in the axial direction at the center. The strong adverse pressure gradient resulted in higher pressure excess ratios (PER) for the counter swirlers. The higher PERs are observed to induce vortex breakdown in counter swirlers even at low vane angles whereas in co-swirlers vortex breakdown is not observed except for the highest vane angle. It is demonstrated that vortex breakdown could be suppressed in counter swirlers using a converging mixer passage. The converging mixer passage creates a favorable pressure gradient that counters the adverse pressure gradient due to swirl decay, resulting in breakdown suppression.

Rapporti di organizzazioni sul tema "60J05":

Murphy, J. M. Apatite fission track data derived from the following Barrow Arch wells: Tulageak T.W. #1 (2940' - 2945'); J.W. Dalton T.W. #1 (4680' - 4686'); East Simpson T.W. #2 (2401' - 2421', 6047' - 6066', 6705' - 6713'); and Fish Creek T. W. #1 (6005' - 6011'). Alaska Division of Geological & Geophysical Surveys, 1994. http://dx.doi.org/10.14509/19062.

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