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Статті в журналах з теми "91A80":
1
Dani, Andrea Tri Rian, and Narita Yuri Adrianingsih. "Pemodelan Regresi Nonparametrik dengan Estimator Spline Truncated vs Deret Fourier." Jambura Journal of Mathematics 1, no. 1 (January 2, 2021): 26–36. http://dx.doi.org/10.34312/jjom.v1i1.7713.
Анотація:
ABSTRAKPendekatan regresi nonparametrik digunakan apabila hubungan antara variabel prediktor dan variabel respon tidak diketahui polanya. Spline truncated dan deret Fourier merupakan estimator dalam pendekatan nonparametrik yang terkenal, karena memiliki fleksibilitas yang tinggi dan mampu menyesuaikan terhadap sifat lokal data secara efektif. Penelitian ini bertujuan untuk mendapatkan estimator model regresi nonparametrik terbaik menggunakan spline truncated dan deret Fourier. Metode estimasi kurva regresi nonparametrik dilakukan dengan menyelesaikan optimasi Ordinary Least Squares (OLS). Kriteria kebaikan model menggunakan GCV, R2 dan MSE. Pemodelan regresi nonparametrik diterapkan pada data Case Fatality Rate (CFR) akibat Demam Berdarah Dengue (DBD) di Indonesia. Berdasarkan hasil analisis, hasil estimasi dari pemodelan regresi nonparametrik menunjukkan bahwa estimator spline truncated memberikan performa yang lebih baik dibandingkan estimator deret Fourier. Hal ini ditunjukkan dengan nilai R2 dari estimator spline truncated yaitu sebesar 91,80% dan MSE sebesar 0,04, sedangkan dengan estimator deret Fourier diperoleh nilai R2 sebesar 65,44% dan MSE sebesar 0,19.ABSTRACTThe nonparametric regression approach is used when the relationship between the predictor variable and the response variable is unknown. Spline truncated and Fourier series are well-known estimators in the nonparametric approach because they have high flexibility and are able to adjust to the local properties of the data effectively. This study aims to obtain the best nonparametric regression model estimator using the truncated spline and the Fourier series. The nonparametric regression curve estimation method is done by completing the Ordinary Least Squares (OLS) optimization. The criteria for the goodness of the model use GCV, R2, and MSE. Nonparametric regression modeling is applied to Case Fatality Rate (CFR) modeling due to Dengue Hemorrhagic Fever (DBD) in Indonesia. Based on the analysis, the estimation results from the nonparametric regression modeling show that the truncated spline estimator provides better performance than the Fourier series estimator. This is shown by the R2 value of the truncated spline estimator which is 91.80% and the MSE is 0.04, while the Fourier series estimator obtained an R2 value of 65.44% and MSE of 0.19.
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Dani, Andrea Tri Rian, and Narita Yuri Adrianingsih. "Pemodelan Regresi Nonparametrik dengan Estimator Spline Truncated vs Deret Fourier." Jambura Journal of Mathematics 3, no. 1 (January 2, 2021): 26–36. http://dx.doi.org/10.34312/jjom.v3i1.7713.
Анотація:
ABSTRAKPendekatan regresi nonparametrik digunakan apabila hubungan antara variabel prediktor dan variabel respon tidak diketahui polanya. Spline truncated dan deret Fourier merupakan estimator dalam pendekatan nonparametrik yang terkenal, karena memiliki fleksibilitas yang tinggi dan mampu menyesuaikan terhadap sifat lokal data secara efektif. Penelitian ini bertujuan untuk mendapatkan estimator model regresi nonparametrik terbaik menggunakan spline truncated dan deret Fourier. Metode estimasi kurva regresi nonparametrik dilakukan dengan menyelesaikan optimasi Ordinary Least Squares (OLS). Kriteria kebaikan model menggunakan GCV, R2 dan MSE. Pemodelan regresi nonparametrik diterapkan pada data Case Fatality Rate (CFR) akibat Demam Berdarah Dengue (DBD) di Indonesia. Berdasarkan hasil analisis, hasil estimasi dari pemodelan regresi nonparametrik menunjukkan bahwa estimator spline truncated memberikan performa yang lebih baik dibandingkan estimator deret Fourier. Hal ini ditunjukkan dengan nilai R2 dari estimator spline truncated yaitu sebesar 91,80% dan MSE sebesar 0,04, sedangkan dengan estimator deret Fourier diperoleh nilai R2 sebesar 65,44% dan MSE sebesar 0,19.ABSTRACTThe nonparametric regression approach is used when the relationship between the predictor variable and the response variable is unknown. Spline truncated and Fourier series are well-known estimators in the nonparametric approach because they have high flexibility and are able to adjust to the local properties of the data effectively. This study aims to obtain the best nonparametric regression model estimator using the truncated spline and the Fourier series. The nonparametric regression curve estimation method is done by completing the Ordinary Least Squares (OLS) optimization. The criteria for the goodness of the model use GCV, R2, and MSE. Nonparametric regression modeling is applied to Case Fatality Rate (CFR) modeling due to Dengue Hemorrhagic Fever (DBD) in Indonesia. Based on the analysis, the estimation results from the nonparametric regression modeling show that the truncated spline estimator provides better performance than the Fourier series estimator. This is shown by the R2 value of the truncated spline estimator which is 91.80% and the MSE is 0.04, while the Fourier series estimator obtained an R2 value of 65.44% and MSE of 0.19.
3
Perangin Angin, Laurensia Masri, and Indah Nursela Sitorus. "APPLICATION OF NUMBERS LINE MEDIA ON ROUND NUMBER MATERIALS TO IMPROVE MATHEMATICAL LEARNING OUTCOMES STUDENT CLASS VI SD N 105425 MALASORI." Jurnal Handayani 11, no. 1 (June 22, 2020): 88. http://dx.doi.org/10.24114/jh.v11i1.19015.
Анотація:
Abstract: The Application of Number Line Media on Round Number Material toImprove Mathematics Learning Outcomes of Students of Class VI SD N 105425Malasori. The purpose of the study was to improve student learning outcomes byapplying media line numbers on integer material in class VI SD N 105425Malasori. This study uses a Class Action Research design which consists of three stages: planning, implementing actions, and reflecting. The subjects of this study were 30 students of grade VI SD N 105425 Malasori. The method applied in this research is observation and test. While the data collection instruments use learning outcomes tests. Research data were analyzed quantitatively. The results of this study indicate that an increase in student learning outcomes by 13 , 23 %, from 78.57% in the first cycle to 91.80% in the second cycle. The conclusion of this study is that the learning of integer materials using number line media can improve student learning outcomes in grade VI SD 105425 Malasori. Therefore, teachers can use media in learning to improve student learning outcomes. Keywords: Line number media; learning outcomes Abstract : Penerapan Media Garis Bilangan Pada Materi Bilangan Bulat UntukMeningkatkan Hasil Belajar Matematika Siswa Kelas VI SD N 105425 Malasori.Tujuan penelitian adalah untuk meningkatkan hasil belajar siswa dengan menerapkan media garis bilangan pada materi bilangan bulat di kelas VI SD N 105425 Malasori. Penelitian ini menggunakan rancangan Penelitian Tindakan Kelas yang terdiri dari tiga tahap yaitu: perencanaan, pelaksanaan tindakan, dan refleksi. Subjek penelitian ini adalah 30 siswa kelas VI SD N 105425 Malasori. Metode yang diterapkan dalam penelitian ini adalah observasi dan tes. Sedangkan instrumen pengumpulan datanya menggunakan tes hasil belajar. Data penelitian dianalisis secara kuantitatif. Hasil penelitian ini menunjukkan bahwa terjadi peningkatan hasil belajar siswa sebesar 13,23%, dari 78,57% pada siklus I menjadi 91,80% pada siklus II. Kesimpulan dari penelitian ini adalah bahwa pembelajaran materi bilangan bulat menggunakan media garis bilangan dapat meningkatkan hasil belajar siswa kelas VI SD 105425 Malasori. Oleh karena itu, guru dapat menggunakan media dalam pembelajaran untuk meningkatkan hasil belajar siswa. Kata kunci: Media garis bilangan; hasil belajar
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Erlings, Esther. "Book review: Julien Chaisse (Ed.), Sixty Years of European Integration and Global Power Shifts: Perceptions, Interactions and Lessons." Foreign Trade Review 55, no. 4 (October 7, 2020): 535–37. http://dx.doi.org/10.1177/0015732520947922.
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Sundharan, Dr Shimi, Dr Shibani Ramchandran, and Raj Jatale. "Dyslipidemia in Prediabetes Population: A Retrospective Study of 91780 Cases." International Journal of Health Sciences and Research 12, no. 10 (October 7, 2022): 132–39. http://dx.doi.org/10.52403/ijhsr.20221017.
Анотація:
Dyslipidemia over time leads to atherogenesis in both diabetics as well as prediabetics. The study aims to assess the correlation if any between the blood glucose levels [HbA1c] and the lipid cholesterol levels among the prediabetes group. Method: A total of 91780 cases were reviewed across India from the same group of laboratory across 7 years from Jan 2015 to May 2022. The lipid profiles and glycated haemoglobin [HbA1c] were tested in all of them. The separation and quantification of hemoglobin A1c (HbA1c) in EDTA whole blood was done on the Tosoh HLC-723 G8 glycohaemoglobin analyzer, an ion exchange HPLC instrument. Analysis of reports of lipid profile which includes triglycerides, total cholesterol, HDL cholesterol LDL cholesterol was done using enzymatic colorimetric test method on Roche analyzer. The prediabetes group was classified based on the HbA1c levels and the lipid profile levels were analysed among them. Results: The analysis showed percentage of prediabetes cases was 40.36%. Age group of >60 years had the maximum prediabetes cases (79.65%), whereas female group had slightly higher proportion prediabetics then males (62.09% VS 61.05%). Prediabetes group showed a significant association with borderline HDL (OR: 1.14, p value <0.0001), major risk HDL (OR: 1.33, p value <0.0001), desirable non HDL cholesterol (OR: 1.31, p value <0.0001), borderline high non HDL cholesterol (OR: 1.54 p value <0.0001), high non HDL cholesterol (OR: 1.60, p value <0.0001) and very high non HDL cholesterol (OR: 1.65, p value <0.0001). We also observed a significant association of borderline high triglycerides (OR: 1.22, p value <0.0001) and high triglycerides (OR: 1.89, p value <0.0001). High VLDL was also associated with pre diabetics (OR: 1.31, p value <0.0001). Conclusion: The study showed that most of the lipid profile parameters were higher in the prediabetes group as compared to the healthy non-diabetic group. The HDL levels were shown to be lower among the prediabetics as compared to the non-diabetics. A mandatory lipid profile screening among prediabetes patients will prevent further cardiovascular risk among them. Key words: Diabetes, prediabetes, glycated haemoglobin [HbA1c], dyslipidaemia, high density lipoprotein [ HDL], Low density lipoprotein [LDL], cholesterol
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Ellis, Thomas B. "RELIGIOUS EVOLUTION AND THE AXIAL AGE: FROM SHAMANS TO PRIESTS TO PROPHETS. By Stephen K. Sanderson. London: Bloomsbury Academic, 2018. Hardback, £91.80; ebook, £91.80." Religious Studies Review 44, no. 3 (September 2018): 317. http://dx.doi.org/10.1111/rsr.13546.
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Hasan, Huma. "Book review: Leila Alikarimi, Women & Equality in Iran: Law, Society and Activism." Indian Journal of Gender Studies 28, no. 1 (February 2021): 150–53. http://dx.doi.org/10.1177/0971521520980859.
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Dobson, Andrew Le Fleming. "Birds of the West Indies: Second Edition." Journal of Caribbean Ornithology 33 (December 26, 2020): 122–23. http://dx.doi.org/10.55431/jco.2020.33.122-123.
Анотація:
BIRDS OF THE WEST INDIES: Second Edition—Herbert A. Raffaele, James Wiley, Orlando H. Garrido, Allan Keith, and Janis I. Raffaele. 2020. Princeton University Press, Princeton, NJ. 288 pp. ISBN 978-06- 91180-51-9. $24.95.
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Galletero Campos, Belén. "Reseña: Las mujeres como impulsoras de transiciones ecofeministas hacia sociedades más justas y diversas. Castilla-La Mancha como laboratorio de experiencias." Investigaciones Feministas 11, no. 2 (June 28, 2020): 381–82. http://dx.doi.org/10.5209/infe.68708.
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Nugroho, Wahyu, Sumarmi Sumarmi, and M. Ramli. "Implementasi Suplemen Bahan Ajar Berbasis Kearifan Lokal pada Subtema Jenis-Jenis Pekerjaan." Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan 6, no. 6 (June 30, 2021): 932. http://dx.doi.org/10.17977/jptpp.v6i6.14891.
Анотація:
<div align="center"><table width="645" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="439"><p class="Abstrak"><strong>Abstract:</strong> This study aims to analyze the implementation of teaching material supplements based on local wisdom in the sub-theme of types of work. This research method is development research with a 4-D development model (define, design, develop and disseminate). The research data obtained by the validation of 90% teacher book experts, 90% student books with very valid criteria, 95.83% teacher book attractiveness test results, while 95.23% student books both reached very attractive criteria, practicality test results on teacher observations 93, 27%, and student activity reached 93.32%, both of which showed very good criteria. The data from the teacher response questionnaire reached 95.31%, the student response questionnaire reached 91.80% which shows very practical criteria. The results of the product effectiveness test showed that student learning outcomes had increased from the average score of 56.09 pretest results to 83.77 at the end of the post-test.</p><p class="Abstrak"><strong>Abstrak:</strong> Penelitian ini bertujuan menganalisis implementasi suplemen bahan ajar berbasis kearifan lokal pada subtema Jenis-jenis pekerjaan. Metode penelitian ini merupakan penelitian pengembangan dengan model pengembangan 4-D (<em>define</em>, <em>design</em>, <em>develop</em> dan <em>disseminate</em><em>)</em>. Data hasil penelitian diperoleh validasi ahli buku guru 90%, buku siswa 90% dengan kriteria sangat valid, hasil uji kemenarikan buku guru 95,83%, sedangkan buku siswa 95,23% keduanya mencapai kriteria sangat menarik, hasil uji kepraktisan pada observasi guru 93,27%, dan aktivitas siswa mencapai 93,32% keduanya menunjukkan kriteria sangat baik. Data hasil angket respon guru mencapai 95,31%, angket respon siswa mencapai 91,80% yang menunjukkan kriteria sangat praktis. Hasil uji keefektifan produk menunjukkan bahwa hasil belajar siswa mengalami peningkatan dari nilai rata-rata hasil <em>pretest </em>56,09 meningkat menjadi 83,77 pada akhir <em>posttest</em>.<strong></strong></p></td></tr></tbody></table></div>
Дисертації з теми "91A80":
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Leutscher, de las Nieves Marcos. "Contributions to the linear programming approach for mean field games and its applications to electricity markets." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAG010.
Анотація:
Cette thèse présente trois contributions principales liées à l'approche de programmation linéaire pour les jeux à champ moyen (MFGs).La première partie de la thèse traite les aspects théoriques des MFGs permettant simultanément arrêt optimal, contrôle stochastique et absorption. En utilisant la formulation de programmation linéaire pour ce type de MFGs, un résultat général d'existence pour les équilibres de Nash MFG est dérivé sous des hypothèses faibles à travers du théorème de point fixe de Kakutani-Fan-Glicksberg. Nous montrons que cette méthode de relaxation est équivalente à l'approche par martingales contrôlées/arrêtées pour les MFG, une autre méthode de relaxation utilisée dans des articles précédents dans le cas du contrôle. De plus, sous des conditions appropriées, nous montrons que notre notion de solution satisfait un système d'équations différentielles partielles (EDP), ce qui permet de comparer nos résultats avec la littérature sur les EDP.La deuxième partie se concentre sur un algorithme numérique pour l'approximation de l'équilibre de Nash MFG en tirant profit de l'approche par programmation linéaire. La convergence de cet algorithme est démontrée pour deux classes de MFG, les MFG avec arrêt optimal et absorption, et les MFG avec contrôle stochastique et absorption. Le schéma numérique appartient à la classe des procédures d'apprentissage. En particulier, nous appliquons l'algorithme Fictitious Play où la meilleure réponse à chaque itération est calculée en résolvant un problème de programmation linéaire.La dernière partie de la thèse porte sur une application des MFGs à la dynamique long terme de l'industrie de l'électricité. Différents scénarios macroéconomiques et de politique climatique sont possibles pour les années à venir, or le scénario exact reste incertain. Par conséquent, les producteurs conventionnels ou renouvelables visant à sortir du marché ou à y entrer, respectivement, sont confrontés à l'incertitude concernant le prix du carbone et les politiques climatiques à venir. Les deux classes de producteurs interagissent par le biais du prix de l'électricité. Des stratégies d'équilibre de Nash sur des temps d'arrêt sont considérées et le problème est analysé à travers d'un modèle MFG. À cette fin, nous développons l'approche de programmation linéaire pour les MFG d'arrêt optimal avec bruit commun et information partielle en temps discret. Nous montrons l'existence d'un équilibre de Nash MFG et l'unicité du prix de marché en équilibre. Enfin, nous étendons l'algorithme numérique développé dans la deuxième partie de la thèse pour illustrer le modèle avec un exemple empirique inspiré du marché de l'électricité britanniqueThis thesis presents three main contributions related to the linear programming approach for mean field games (MFGs).The first part of the thesis is concerned with the theoretical aspects of MFGs allowing simultaneously for optimal stopping, stochastic control and absorption. Using the linear programming formulation for this type of MFGs, a general existence result for MFG Nash equilibria is derived under mild assumptions by means of Kakutani-Fan-Glicksberg's fixed point theorem. This relaxation method is shown to be equivalent to the controlled/stopped martingale approach for MFGs, another relaxation method used in earlier papers in the pure control case. Furthermore, under appropriate conditions, we show that our notion of solution satisfies a partial differential equation (PDE) system, allowing to compare our results with the PDE literature.The second part focuses on a numerical algorithm for approximating the MFG Nash equilibrium taking advantage of the linear programming approach. The convergence of this algorithm is shown for two classes of MFG, MFGs with optimal stopping and absorption, and MFGs with stochastic control and absorption. The numerical scheme belongs to the class of learning procedures. In particular, we apply the Fictitious Play algorithm where the best response at each iteration is computed by solving a linear programming problem.The last part of the thesis deals with an application of MFGs to the long term dynamics of the electricity industry. Different macroeconomic and climate policy scenarios are possible for the coming years, and the exact scenario remains uncertain. Therefore, conventional or renewable producers aiming to exit or enter the market, respectively, are facing uncertainty about the future carbon price and climate policies. Both classes of producers interact through the electricity market price. Nash equilibrium strategies over stopping times are considered and the problem is analyzed through a MFG model. To this end, we develop the linear programming approach for MFGs of optimal stopping with common noise and partial information in discrete time. We show the existence of an MFG Nash equilibrium and the uniqueness of the equilibrium market price. Finally, we extend the numerical algorithm developed in the second part of the thesis to illustrate the model with an empirical example inspired by the UK electricity market
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Crostelli, Marco. "Il mediatore linguistico durante la colonizzazione del nuovo mondo, con particolare attenzione al Messico e alla figura De La Malinche." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9180/.
Анотація:
Lo scopo di questo lavoro è capire come funzionasse la mediazione linguistica tra popoli di continenti diversi e lontani. L’elaborato finale si sviluppa in quattro macrocapitoli. Nel primo parlerò della comunicazione e della mediazione in senso generale e cercherò di fornirne una panoramica a tinte storiche e sociali. Nel secondo accennerò alla figura del mediatore culturale dal punto di vista storico e la analizzerò in un contesto preciso: la colonizzazione delle Americhe da parte degli europei, nei secoli XVI e XVII. Il terzo macrocapitolo introduce due personaggi chiave (Gerónimo de Aguilar e Gonzalo Guerrero) che legano la mediazione di epoca coloniale alla figura de La Malinche e pertanto questo funge da ponte tra il secondo ed il quarto. Nell'ultimo macrocapitolo proverò a raccontare la storia de La Malinche, l'interprete personale del conquistador spagnolo Hernán Cortés, durante la colonizzazione della penisola dello Yucatán, in Messico. Le conclusioni alle quali sono giunto coincidono con le risposte concrete al mio quesito su come funzionasse la mediazione linguistica nel mondo antico. In particolare ho individuato alcune vie principali attraverso le quali è nata la figura del mediatore-interprete. Nello specifico, queste vie sono: l'intreccio amoroso tra conquistatori e donne indigene; lo studio delle lingue native da parte degli ecclesiasti; il rapimento di giovani indigeni o lo scambio di giovani tra europei e nativi così che apprendessero la lingua degli altri e viceversa; lo sfruttamento di schiavi o servi che avevano appreso la lingua tramite la cosiddetta “immersione”; l'inserimento in tribù indigene di giovani avventurieri europei i quali imparavano la lingua per immersione; il caso.
3
Wallis, L. A. E. "Diffusion of new psychoactive substances : understanding population motives, harms and intervention needs." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/9180/.
Анотація:
Background: Although there is a growing body of literature surrounding new psychoactive substances (NPS), and reasons for general use have been described, there is little understanding as to why certain NPS spread through user populations and become popular. This research used Rogers’ 1962 diffusion of innovations theory (DOI) to help better understand the NPS market and how it is shaped and characterised. Objective The aim of this research was to explore the diffusion of NPS in the UK and why different NPS diffuse and others fail to do so, to identify appropriate public health interventions to reduce harm. Methodology: A mixed methods approach was undertaken, which comprised four studies. The first study involved a critical analysis of the appropriateness of Rogers’ DOI to explain the diffusion of NPS. This study was followed by two sets of interviews. The first interview study was conducted with NPS online retailers based in the UK. The second interview study involved interviews with NPS professionals including law enforcement professionals, drug policy organisations and NPS early warning system representatives from the UK, wider Europe, America and Australasia. These findings were analysed using thematic analysis. The final study was an online questionnaire and choice-based conjoint analysis with UK pre-existing recreational drug users aged between 18 and 35. These findings were analysed using Latent Class Analysis. Results: The DOI was found to be applicable for the diffusion of an NPS product. However, the theory should be used in application to different individual NPS; NPS should not be classed as a homogenous group of substances and NPS users should not be classed as a homogenous group either. It was found that the theory should be updated in relation to NPS to include the influence of the internet. The key reason for the diffusion of an NPS was found to be the psychopharmacological effects of a product. However, there should also be an acknowledgment of the importance of friendship networks, and increasingly online forums. Even if a product had the desired psychopharmacological effects, if these are not communicated then it is unlikely to diffuse at a fast rate. Conversely, unless a product had the psychopharmacological effects desired by an individual, despite positive feedback from friends and online forums, it would be unlikely to diffuse. The emergence of NPS did not have a transformative effect for all drug-using groups; instead, it affected different user groups in different contexts. Similarly, it is likely that the introduction of the UK Psychoactive Substances Act will not have a transformative effect on the use of NPS by all drug-using groups. Nevertheless, the changes in health and social harms associated with individuals accessing NPS through the underground market or choosing to use traditional illegal drugs should be recognised. Finally, the need to conduct research with a range of stakeholders, to gain a greater understanding of motivations for drug use to assist with future public health interventions, was an important finding of the thesis.
4
Vahdat, Kamran. "Seismic risk management." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/9180/.
Анотація:
Seismic risk management is a problem of many dimensions, involving multiple inputs, interactions within risk factors, criteria, alternatives and stakeholders. The deployment of this process is inherently fraught with the issues of complexity, ambiguity and uncertainty, posing extra challenges in the assessment, modelling and management stages. The complexity of earthquake impacts and the uncertain nature of information necessitate the establishment of a systematic approach to address the risk of many effects of seismic events in a reliable and realistic way. To fulfill this need, the study applies a systematic approach to the assessment and management of seismic risk and uses an integrated risk structure. The fuzzy set theory was used as a formal mathematical basis to handle uncertainties involved within risk parameters. Throughout the process, the potential impacts of an earthquake as the basic criteria for risk assessment were identified and relations between them were accommodated through a hierarchical structure. The various impacts of an earthquake are then aggregated through a composite fuzzy seismic risk index (FSRi) to screen and prioritize the retrofitting of a group of school buildings in Iran. Given the imprecise data which is the prime challenge for development of any risk model, the proposed model demonstrates a more reliable and robust methodology to handle vague and imprecise information. The significant feature of the model is its transparency and flexibility in aggregating, tracing and monitoring the risk impacts. The novelty of this study is that it serves as the first attempt of the process of a knowledge base risk-informed system for ranking and screening the retrofitting group of school buildings. The model is capable of integrating various forms of knowledge (quantitative and qualitative information) extracted from different sources (facts, algorithms, standards and experience). The outcomes of the research collectively demonstrate that the proposed system supports seismic risk management processes effectively and efficiently.
5
Summers, Sam. "Intertextuality and the break from realism in DreamWorks Animation." Thesis, University of Sunderland, 2018. http://sure.sunderland.ac.uk/9180/.
Анотація:
This thesis contextualises and historicises the contribution of DreamWorks Animation to the dominant aesthetic of contemporary American feature animation from the early 2000s to the present day. Specifically, it aims to justify the claim that mainstream feature animation has shifted away from hyperrealism and towards a form of ‘narrative-cartoonalism’ predicated on non-visual departures from realism. The thesis introduces this term to counteract the focus on the visual in conceptions of animated realism, and aims to identify the extent to which the DreamWorks studio played a key role in this shift, particularly through its use of intertextuality. Tracing the history of intertextuality in animation from the 1920s to the present day, the thesis looks to establish DreamWorks’ position within this lineage by closely examining the studio’s use of star performances, contemporary music, generic pastiche and allusive comedic gags in its features, and discussing the various diegetic contradictions that result. Ultimately, I intend for this thesis to contribute a crucial approach to understanding one of the key studios working during a hugely significant period of western feature animation, not only illuminating the output of Dreamworks but of this period as a whole. Culturally important yet critically neglected, research into the aesthetics of this modern era is essential to the progression of animation studies.
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Gouvea, Flavio Roberto [UNESP]. "Um estudo de fractais geométricos através de caleidoscópios e softwares de geometria dinâmica." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/91080.
Анотація:
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Neste trabalho abordamos um tema pouco explorado nos cursos de graduação em Matemática, que é a Geometria Fractal, resgatando conceitos básicos da Geometria Euclidiana, utilizando caleidoscópios e softwares educacionais. Assim, foram tecidas algumas considerações a respeito da utilização de computadores na sala de aula, através de um estudo que investigou: Que contribuições pode trazer, para o ensinoaprendizagem de Geometria, um estudo de Fractais Geométricos através de caleidoscópios e softwares de Geometria Dinâmica ?. Foram elaboradas atividades e aplicadas a alunos da Licenciatura em Matemática (do 1º e 2º semestres) da Unesp de Rio Claro, que participaram de um Curso de Extensão. A utilização de materiais diferentes do tradicional, como o caleidoscópio e o computador (este último como elemento inserido no contexto educacional), e a contextualização da Geometria contribuíram para o estabelecimento de um ambiente de aprendizagem agradável e participativo. Nosso estudo mostrou uma maneira inovadora de obterem-se fractais geométricos: através de bases caleidoscópicas, o que enseja um grande estudo sobre espelhos e caleidoscópios, e traz em si a oportunidade de estudarem-se muitos conceitos geométricos (reflexão, simetrias, transformações geométricas, bissetriz, mediatriz, seqüências, etc.). Apresentamos, ainda, alguns aspectos pedagógicos e matemáticos relacionados à aplicabilidade dos Fractais Geométricos no processo de construção de conceitos geométricos, por meio da interação aluno-aluno, aluno-computador e alunoprofessor, tendo como pano de fundo a resolução de problemas. Dessa forma, nosso estudo proporcionou para os alunos uma maior relação com os conceitos fundamentais de Geometria Euclidiana e Geometria Fractal, além de uma alternativa metodológica inerente ao ensino da Geometria.
In this work we approached a theme little explored in the degree courses in Mathematics, that it is the Fractal Geometry ransoms basic concepts of the Euclidian Geometry, using kaleidoscopic and educational softwares. At his, are some woven considerations respect the use computers in the classroom, through a study that enquired: What contributions can bring, for teaching-learning of Geometry, a study of the geometrical fractals that include kaleidoscopic and softwares of Dynamic Geometry? Activities were elaborated and applied to students of the degree in mathematics (of the 1st and 2nd semesters) of Unesp de Rio Claro, who participated in a Course of Extension. The use of different materials from the traditional as the kaleidoscopic and computer (this last one as element inserted in the education context), and the contextualization of the Geometry contributed to the establishment of an environment of the pleasing learning and interest. Our study showed an innovator way of they be obtained fractal geometrics: through of kaleidoscopic bases, that wish a great study with mirrors and kaleidoscopic, and bring in itself the opportunity of they be studied many geometric concepts (reflection, symmetric, geometric transformations, bisector, mediate, etc). We presented, still, some pedagogic and mathematic aspects related to the applicability of Fractal Geometrics in the process of construction of geometrical concepts, through the interaction student-student, student-computer and student-teacher using as backdrop the problem solve. Of this form, our study it provided for the students a bigger relation with the basic concepts of Euclidean Geometry and Fractal Geometry, beyond inherent a metodology alternative to the teaching of Geometry.
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Souza, José Eduardo Pereira de [UNESP]. "Informática na EJA: contribuições da teoria histórico-cultural." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/91180.
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souza_jep_me_mar.pdf: 1344441 bytes, checksum: 0a1cca138786f92d1167ce2788c56d83 (MD5)Por trabalharmos há muitos anos com o fornecimento de softwares educativos para escolas e universidades, tínhamos a convicção de que a tecnologia podia se constituir em ferramenta importante para o processo de ensino-aprendizagem. Ao iniciarmos nossos estudos verificamos que a Educação de Jovens e Adultos - EJA era um segmento pouco estudado e com baixa utilização de tecnologias educacionais. Observamos, também, que já existiam alguns estudos sobre o uso das tecnologias na Educação com enfoque em teorias de ensino-aprendizagem, porém, não localizamos nenhum direcionado para a Teoria Histórico-Cultural - THC. Decidimos que o objetivo de nossa pesquisa seria buscar pressupostos da Teoria Histórico-Cultural que pudessem contribuir para o uso da Informática na Educação de Jovens e Adultos - EJA. Para a concretização do estudo desenvolvemos investigação bibliográfica abrangendo a história da Educação Brasileira, os índices de qualidade na Educação, o analfabetismo funcional e o letramento, a dualidade de função da escola que ao mesmo tempo emancipa e aliena, as iniciativas governamentais para a EJA, as diversas teorias da aprendizagem e as relacionamos com as tecnologias. Analisamos a questão do alfabetismo digital, da formação dos professores e nos aprofundamos na Teoria Histórico-Cultural pensando sobre o entorno, sobre as perspectivas educativas que se abrem ao se considerar a Zona de Desenvolvimento Proximal e o aprendizado pela interação social. Apresentamos as Tecnologias da Informação e Comunicação - TIC e relacionamos a Informática na Educação com a EJA e apresentamos um caso real sobre o assunto. Coletamos dados por meio de entrevistas, formulários, observações e registros durante o processo de formação de professores com ênfase na abordagem Histórico-Cultural e durante suas atividades com alunos nos laboratórios de informática em Pirassununga (SP)
By working for many years with the provision of educational software for schools and colleges we had the conviction that technology could be constituted as an important tool in the teaching-learning process. When we began our studies we found that the YAE – Youth and Adult Education was a segment little studied and with low use of educational technologies. We also noted that there were already some studies on the use of technology in Education with focus on theories of teaching-learning, however, we did not find any directed to the Historic-Cultural Theory. We decided that the goal of our research would be to seek assumptions of the Historical-Cultural Theory that could contribute to the use of the Computer in Youths and Adults Education – YAE. To realize the study we developed literature investigation comprehending the history of Brazilian Education, the quality indexes in Education, the functional illiteracy and the literacy, the dual function of the school that, at the same time, emancipates and alienates, the government initiatives for the YAE, the various learning theories and related it to the technologies. We analyzed the issue of the digital illiteracy, of the teacher training and we went deeper in the Historical-Cultural Theory thinking about the environment, about the educational prospects that open up when considering the Zone of Proximal Development and the learning through social interaction. We Introduced the ICT – Information and Communication Technology and related it to the Data Processing in Education in YAE – Youth and Adult Education and presented a real case on the subject. We collected data through interviews, forms, observation and records during the process of teachers education with an emphasis on historical-cultural approach and during their activities with students in the computer labs in Pirassununga (SP). We concluded our work showing that the pedagogical approach
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Paula, Raquel de [UNESP]. "Desenvolvimento de um protocolo para avaliação de habilidades comunicativas de alunos não-falantes em ambiente escolar." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/91280.
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paula_r_me_mar.pdf: 690279 bytes, checksum: 0e513ca2151eca4e9b8e3e9698f9b221 (MD5)Muitos pesquisadores têm se preocupado com a avaliação na educação especial para o conhecimento das necessidades e habilidades do aluno deficiente. Em se tratando de alunos não-falantes, é fundamental a avaliação de suas habilidades comunicativas, dada a sua importância para o processo de ensino-aprendizagem. Visando a colaborar com instrumentos já existentes e devido à escassez de trabalhos na área, o objetivo deste estudo foi desenvolver um protocolo para avaliação de habilidades comunicativas de alunos não-falantes em ambiente escolar. O desenvolvimento do protocolo foi realizado cinco etapas. Na primeira etapa, o protocolo apresentado inicialmente sofreu três mudanças referentes ao lay out e a redação de algumas perguntas para aplicação na próxima etapa. Na segunda etapa, aplicou-se o protocolo a um grupo de 23 professores que lecionavam para alunos não-falantes, três fonoaudiólogas, uma assistente social e uma psicóloga a fim de verificar possíveis problemas no instrumento. Após análise, foi verificado um número elevado de itens deixados em branco e itens preenchidos de maneira inadequada na seção Principal e também se verificou a necessidade de mudanças em todas as outras quatro seções para que houvesse maior clareza aos respondentes. Na terceira etapa, após reformulação, aplicou-se o protocolo a um grupo de dois coordenadores, 16 professores que também lecionavam para alunos não-falantes, dois fisioterapeutas, cinco fonoaudiólogas e dois terapeutas ocupacionais e, após análise, também foram encontrados itens em brancos, mas em número menor que na etapa anterior, na seção Principal. Não houve itens preenchidos de maneira inadequada, sendo que nas outras seções também não foram encontrados problemas, exceto na da Rotina, encontrada em branco em alguns protocolos...
A number of researchers have been giving attention to evaluation in special education for identifying the challenged student s needs and skills. When it comes to non-speaking students, it is essential to evaluate his/her communication skills, given the importance to the teaching-learning process. Aiming at collaborating with already existent instruments and due to the lack of studies on the matter, the objective of the present study was to develop a protocol for evaluating communication skills of non-speaking students in school environment. In order to develop the protocol, five steps were taken. During the first step, the protocol suffered three lay-out changes and some questions were formulated to be applied on the next step. During the next step, the protocol was submitted to a group of 23 teachers who taught non-speaking students, 3 speech language pathologists, 1 social worker, and 1 psychologist with the purpose of checking for possible problems with the instrument. It was verified there was a great number of blank items as well inadequately filled ones on the Principal section. It was also noticed that the four other sections had to be modified for the sake of a better understanding. During the third step, after changes had been made, the protocol was submitted to a group of 2 coordinators, 16 teachers who also taught non-speaking students, 2 physiotherapists, 5 speech-language pathologists, and 2 occupational therapists. After analysis, blank items were also found, although not as many as before. There were no inadequately filled items, no problems were found on other sections, exception made on the Routine section, which was blank in some protocols. During the forth step, interviews were carried out, using the very protocol itself to also find out what could justify the problems during the previous step, given the fact that changes had already been made...(Complete abstract click electronic access below)
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Salvador, Mariana Closs [UNESP]. "Efeito de genótipos de soja e de flavonóides na biologia e no intestino médio de Anticarsia gemmatalis." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/91380.
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salvador_mc_me_jabo.pdf: 7027477 bytes, checksum: 394b5cb96a70d0501615adb0cf5b09f4 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Resultados de efeitos de compostos fenólicos incorporados em dietas artificiais têm sido contestados, principalmente pela presença de proteínas com alto valor nutritivo, como a caseína, que podem influenciar a atividade dos aleloquímicos. Genótipos de soja resistentes a insetos têm apresentado flavonóides em sua composição, tornando necessária a informação sobre a interação deste fenólico com dieta. Adicionalmente, avaliaram-se os efeitos de dietas artificiais, contendo diferentes concentrações de rutina (R) e genistina (G), e de genótipos de soja nos aspectos biológicos, assim como o modo de ação desses alimentos no intestino médio (IM) de A. gemmatalis. O efeito de rutina foi potencializado apenas quando as lagartas se alimentaram com dietas com 7g de caseína, ou seja, a metade da necessária para o desenvolvimento adequado do inseto. Dietas com as maiores concentrações de rutina (R2) e a mistura R1+G1 e folhas de PI 227687 e ‘IAC-100’ foram responsáveis pela maior mortalidade, redução dos pesos iniciais e de pupa, menor ganho de peso e crescimento. Estes tratamentos, principalmente R1+G1 e ‘IAC-100’ ainda provocaram maiores alterações morfológicas no IM da lagarta. Dietas e genótipos contendo apenas genistina não apresentaram acentuado efeito antinutricional no inseto e nem alterações morfológicas importantes. Assim sendo, estes resultados permitem concluir que a interação das substâncias R e G observadas em folhas de soja, como a ‘IAC-100’ e PI 227687, atua na proteção da planta ao ataque de A. gemmatalis, possivelmente por alterar as células colunares do IM.
Results regarding the effects of phenolics incorporated in artificial diets have been contested, mainly by the presence of high nutritive proteins as casein. This protein can cause deep influence in the alelochemical activity on herbivores. Resistant soybean genotypes have presented flavonoids, as rutin (R), in their chemical profile, turning necessary the information related to the interaction of such phenolic compound with the artificial diet. Additionally, effects of diets, with different concentration of R and genistin (G), and of soybean leaves on biological aspects, as well as, on the mode of action of them in A. gemmatalis midgut were evaluated. Rutin effect was only potentialized when larvae fed on diet with 7g of casein, i.e., half of amount necessary for an adequate insect development. Insects fed on artificial diet containing R2 (the highest rutin concentration) or R1+G1 (mixture of R and G), on PI 227687 and ‘IAC-100’ caused higher mortality, reduction in weighs of larvae (end of second instar) and pupae, also gained less weigh and presented lower growth compared to other diets. These treatments, mainly R1+G1 and ‘IAC-100’ also presented more morphologic alterations in the insect midgut. Diets and genotypes containing only genistin did not show accentuated antinutritional effect and presented less intense morphologic alterations in the insect midgut. Thus, these results allow suggesting that R and G, observed in leaves of soybean, as ‘IAC-100’ and PI 227687, interacts in the protection of the plant to A. gemmatalis attack, possibly by causing alterations in columnar cells of midgut.
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Waidemam, Leandro [UNESP]. "Análise dinâmica de placas delgadas utilizando elementos finitos triangulares e retangulares." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/91480.
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waidemam_l_me_ilha.pdf: 2247815 bytes, checksum: aab885504632d6169da23c5ac9796141 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Este trabalho tem como objetivo principal analisar o comportamento dinâmico de estruturas laminares planas com carregamento perpendicular ao plano médio, em particular as placas delgadas, utilizando-se, para isso, a teoria clássica de flexão de placas e a discretização estrutural feita com os elementos finitos triangulares e retangulares trabalhando em conjunto e em separado. Na dedução das matrizes de rigidez e de massas dos elementos finitos em questão utiliza-se a formulação com parâmetros generalizados e com coordenadas homogêneas, cujas funções aproximadoras contêm nove e doze monômios, respectivamente, extraídos do polinômio algébrico cúbico em “x” e “y”. Para a consideração do amortecimento utiliza-se o Método de Rayleigh e para a integração numérica ao longo do tempo utiliza-se o Método de Newmark, via algoritmo previsor / corretor. Ao final deste são elaborados vários exemplos elucidativos visando uma análise quantitativa e qualitativa dos resultados obtidos.
In this work the dynamic behavior of plane laminate structures, with load applied perpendicularly to the middle plan, has been analyzed. The classic theory of bending plates and structural subdivision - done with triangular and rectangular finite elements working together as well as in separate – are used to study thin plates. The formulation employing generalized parameters and homogeneous coordinates, using approximating functions containing nine and twelve terms starting from the cubic algebraic polynomial in Cartesian coordinates x and y, is used to obtain the stiffness and mass matrices for the triangular and rectangular finite element, respectively. The Rayleigh Method is used to take into account the structural dumping while the Newmark Method is used to perform the numeric integration in the time, by means of predictor / corrector scheme. Additionally, several elucidating examples are elaborated in order to analyze the final results.
Книги з теми "91A80":
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Asmussen, Georg. Findbuch des Bestandes Abt. 47.1: Kuratorium der Christian-Albrechts-Universität Kiel. Hamburg: Hamburg University Press, 2007.
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Polkowski, Lech T. Logics for Computer and Data Sciences, and Artificial Intelligence. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91680-0.
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Kriwy, Peter, and Christiane Gross, eds. Klein aber fein! Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91380-3.
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Bechtel, Michael. Regierung, Rendite, Risiko. Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91480-0.
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Schabdach, Michael. Soziale Konstruktionen des Drogenkonsums und Soziale Arbeit. Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91580-7.
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Roddeck, Werner. Einführung in die Mechatronik. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3.
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Sydow, Jörg, ed. Management von Netzwerkorganisationen. Wiesbaden: Gabler Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-91280-0.
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Pfahl-Traughber, Armin. Antisemitismus in der deutschen Geschichte. Wiesbaden: VS Verlag für Sozialwissenschaften, 2002. http://dx.doi.org/10.1007/978-3-322-91380-7.
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Hrušák, Michael, Ángel Tamariz-Mascarúa, and Mikhail Tkachenko, eds. Pseudocompact Topological Spaces. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91680-4.
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Schmitz, Volker, ed. Axel Honneth and the Critical Theory of Recognition. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91980-5.
Частини книг з теми "91A80":
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Hillman, Jennifer. "Predictors, Victimization, and Negative Health Outcomes Associated with Incarceration Among 9180 Trans Women from the US Transgender Survey." In Perceptions of Female Offenders, Vol. 2, 75–92. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-45685-5_5.
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Roddeck, Werner. "Einleitung." In Einführung in die Mechatronik, 1–23. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_1.
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Roddeck, Werner. "Modellbildung technischer Systeme." In Einführung in die Mechatronik, 24–47. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_2.
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Roddeck, Werner. "Dynamik mechanischer Systeme." In Einführung in die Mechatronik, 48–107. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_3.
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Roddeck, Werner. "Schwingungen." In Einführung in die Mechatronik, 108–47. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_4.
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Roddeck, Werner. "Sensoren." In Einführung in die Mechatronik, 148–93. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_5.
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Roddeck, Werner. "Aktoren." In Einführung in die Mechatronik, 194–237. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_6.
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Roddeck, Werner. "Prozessdatenverarbeitung- und Regelungstechnik." In Einführung in die Mechatronik, 238–386. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_7.
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Roddeck, Werner. "Simulation." In Einführung in die Mechatronik, 387–419. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_8.
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Roddeck, Werner. "Mechatronische Systeme." In Einführung in die Mechatronik, 420–57. Wiesbaden: Vieweg+Teubner Verlag, 2003. http://dx.doi.org/10.1007/978-3-322-91180-3_9.
Тези доповідей конференцій з теми "91A80":
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"Front Matter: Volume 9180." In SPIE Solar Energy + Technology. SPIE, 2014. http://dx.doi.org/10.1117/12.2176695.
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Kostyukova, Tatyana Anatolyevna, Igor Vyacheslavovich Dmitriev, and Olga Vladimirovna Subbotina. "Motivational methods in learning and development as a core principle of an educational institution activity (a case study for ANO APE "Open Youth University")." In VIII International applied research conference. TSNS Interaktiv Plus, 2016. http://dx.doi.org/10.21661/r-91280.
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Ji, Yongbin, Liang Zhang, Ming Jin, Bing Ge, Shusheng Zang, Jianhua Xin, Weiliang Wu, Mingjia Li, and Wenyan Xu. "Experimental Study on Overall Cooling Effectiveness of Swirl-Stabilized Model Combustor With Effusion Cooling." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91080.
Анотація:
Abstract Application of effusion cooling or effusion based compound cooling in the state of art gas turbine combustor is more and more common, especially in aero-engines. A linearly arranged planar optically accessible three-nozzle lab scale combustor equipped with perforated testing plate for cooling is designed. Overall cooling effectiveness is experimentally examined as the key indicator of cooling performance at non-reacting flow conditions. Main air is electrically heated to about 573K. Temperature of perforated liner is recorded by the short-wave infra camera with careful calibration. Effect of effusion hole inclination angle is investigated by comparing at forward (30°), normal (90°) and backward (150°) cases. Pressure drop across the nozzle is set to be 3%, 4% and 5% respectively and that is 0–2.5% for the effusion plate. The main purpose of this work is to characterize combustor liner effusion cooling capacity at conjugate heat trasnfer conditions, and backward cooling configuration is firstly investigated. Results clearly show that effusion cooling behavior is strongly influenced by main swirling flow regime near the combustor liner wall. To be specific, three zones as Corner Recirculation Zone (CRZ), Impinging Zone (IZ) and Developing Zone (DZ) can be divided. IZ is the region which we should treat carefully for liner cooling design because it sustains the highest heat load. Generally, inclined holes perform better cooling characteristics than normal ones. The important observation is that backward injections reveal “anti-impinging” ability, which can enhance the cooling effectiveness in upstream CRZ and IZ greatly with high coolant consumption. The potential drawback is that reverse cooling jets may induce intense interactions with main flow. But it is still a good choice for optimizing combustor effusion cooling, especially in swirling impinging regions.
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Somehsaraei, Homam Nikpey, Davide Iaria, Jafar Al Zaili, Mohsen Assadi, Abdulnaser Sayma, and Mohsen Ghavami. "Application of Artificial Neural Networks for Monitoring and Optimum Operation Prediction of Solar Hybrid MGT Systems." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91180.
Анотація:
Abstract Hybrid energy system consisting of a parabolic dish solar concentrator and a micro gas turbine (MGT) has been considered as promising distributed generation technology, since it can be operated as a stand-alone system for power or combined heat and power (CHP) applications in remote areas with no connection to the grid. The main concern when it comes to distributed generation is the ability of maintaining high availability. Therefore, given the intermittency of the solar resource, the availability of consistent and computationally fast tools for modelling and monitoring of solar micro gas turbines is essential for adequate and optimum operation. This paper presents the application of artificial neural networks (ANNs) for performance prediction and monitoring of a hybrid solar MGT system. For this purpose, a validated in-house tool, developed for evaluating the performance of solar-hybrid MGT, was used to generate simulated data at various operational conditions by varying solar irradiation and ambient conditions. The obtained data was used to train the ANN model. The prediction accuracy of the ANN model was tested using a data set, which were not used during the training process. The results showed that the ANN model can predict the solar hybrid MGT performance with high accuracy and could serve as an accurate baseline model for monitoring applications. Finally, the developed ANN model was integrated with an optimization algorithm. A case study was conducted using the developed ANN model for multi-objective optimization of the hybrid solar MGT. By varying turbine inlet temperature and rotational speed, the system performance at part load operation were analysed resulting in a Pareto front for maximum electrical efficiency and minimal operational cost. Multi-objective genetic algorithm (GA) based on controlled elitism concept was applied to find the optimum solution.
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Rubechini, Filippo, Matteo Giovannini, Andrea Arnone, Daniele Simoni, and Francesco Bertini. "Reducing Secondary Flow Losses in Low-Pressure Turbines With Blade Fences: Part I — Design in an Engine-Like Environment." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91280.
Анотація:
Abstract This paper deals with the design of passive control devices for reducing the impact of secondary flows on the aerodynamics of low-pressure turbine (LPT) stages. A novel kind of device is introduced which consists of shelf-like fences to be added to the blade surface. Such a device is intended to hinder the development of secondary flows, thus reducing losses and flow turning deviation with respect to the straight blade. The first part of this work is devoted to the design of the blade fences, whereas the second part addresses the experimental validation of the device. The blade fences are designed on a LPT stator vane, in an engine-like environment. As secondary flows generated by one blade row produce their major effects on the downstream one, and hence on the stage performance, the assessment is performed on a stator-rotor configuration. Steady calculations are considered for the design, then the optimal geometry is verified via unsteady calculations to include the effects of the actual interaction. The geometry and layout of the blade fences are effectively handled by means of a parametric approach, which enables the fast generation of several configurations. An optimization procedure, based on Artificial Neural Networks (ANNs) is exploited to drive the fences design. The analysis of the relative merit of each solution is carried out using a state-of-the-art CFD approach. Finally, a detailed comparison between the original blade and the one equipped with fences is presented, and the physical mechanisms responsible for the mitigation of secondary flow losses are discussed in detail.
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Liefke, Alexander, Vincent Marciniak, Jan Backhaus, Christian Frey, Hanno Gottschalk, and Uwe Janoske. "Aerodynamic Impact of Manufacturing Variation on a Nonaxisymmetric Multi-Passage Turbine Stage With Adjoint CFD." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91480.
Анотація:
Abstract Turbomachinery blade design is based on an axisymmetric model assuming identical blades in the circumferential direction. The blade manufacturing process, however, has a finite accuracy leading to surface imperfections and therefore non-identical blades. This leads to a variation in each passage cross area effecting the aerodynamic performance of the turbine. The simulation of multiple 3D CFD blade passages, nevertheless, is still computational expensive. However, if the effect of nonaxisymmetric blades is small enough to be approximated as linear, the adjoint method is an inexpensive alternative, which can be used in an industrial context. A set of 102 turbine vanes is used to model the manufacturing variations and assess the aerodynamic impact of up to eight nonaxisymmetric blade passages of a transonic high pressure turbine stage. It is shown that the modeled blade passage results superimpose linearly. Therefore, the aerodynamic impact of surface imperfections can be evaluated by superpositioning the singlepassage results, which are generated by an adjoint computation.
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Gillespie, John, Dustin Frohnapfel, and Walter O’Brien. "Pre-Test Evaluation of Probe Configuration Errors." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91780.
Анотація:
Abstract Rake probes are commonly used in turbomachinery applications to measure distorted inlet flows, including both pressure and swirl distortions. An especially common configuration is the 40 probe rake array, consisting of eight identical arms equally spaced circumferentially around the inlet, each arm having five sensing locations spaced along centers of equal area. By measuring many locations simultaneously, rake probes have the advantage of expedited data collection when compared to traversing probes. However, this reduction in test time comes at the cost of rigid geometry with limited measurement locations. As a result, it is possible for rake probes to miss or exaggerate significant areas of the flow profile, such as large gradients or small features, based on the fixed location of the probe and the particular details of the distortion. The purpose of this paper is to demonstrate a procedure that can be used to evaluate the ability of any desired probe configuration (40 probe rake or otherwise) to sufficiently and accurately measure a non-uniform flow profile. Results of this procedure for a range of profiles and probe configurations are also presented. In order to accurately determine the impact of discrete sampling on the results, two broad sets of data were generated numerically and analyzed. The first set consists of four fundamental total pressure distortions: once-per-rev circumferential, twice-per-rev circumferential, hub radial, and tip radial. The second set consists of three realistic turbofan distortion patterns: two analytic (though not fundamental) profiles, and one generated from S-duct computational results. For all investigated patterns, Radial Distortion Intensity and Circumferential Distortion Intensity are calculated in the manner described by ARP 1420, a guideline issued by the S-16 Turbine Engine Inlet Flow Distortion Committee for measuring total pressure distortions in turbomachinery. Additionally, interpolated total pressure contours are generated for each measurement configuration. These were then used to make point-to-point comparisons between the actual and estimated data. While total pressure distortion was used as the variable of interest for the majority of this paper, the conclusions may be applied to swirl, temperature, or any other flow property measured using a probe rake or traversing probe.
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Cho, Heejin, and Nelson Fumo. "Uncertainty Analysis for Dimensioning Solar Photovoltaic Arrays." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91080.
Анотація:
As the world population increases, so does their demand for energy. The demand of energy is mainly in the form of electricity with an origin primarily from fossil fuels. Since solar photovoltaic technology has the ability to convert solar energy directly into electricity, this technology has become one of the most popular alternatives at all scales for substitution of technology that uses fossil fuels. However, a limiting factor for the massive use solar photovoltaic technology is economics. A key component in the overall strategy to overcome the economic limitation of solar photovoltaic technology is the system size optimization at the design stage. At the design stage, data related to the solar energy availability, energy demand, and equipment performance is used to determine the size of the equipment while being able to satisfy the targeted peak energy demand. In general, a common engineering safety factor is used to ensure the system to meet the energy demand during its life cycle operation. The sizing procedure of solar photovoltaic systems can be further improved to be more reliable and economical when the uncertainty in the design process is considered. This paper presents a framework to perform an uncertainty analysis that can lead to improve sizing process for solar photovoltaic arrays. Through results from the application of the proposed approach, a reliable interval for the size of the photovoltaic array is found that can lead to more accurate and economic design compared to the use of common engineering safety factors.
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Keene, Daniel J., Jane H. Davidson, and Wojciech Lipiński. "A Model of Transient Heat and Mass Transfer in a Heterogeneous Medium of Cerium Dioxide Undergoing Nonstoichiometric Reduction." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91380.
Анотація:
The redox chemistry of nonstoichiometric metal oxides can be used to produce chemical fuels by harnessing concentrated solar energy to split water and/or carbon dioxide. In such a process, it is desirable to use a porous reactive substrate for increased surface area and improved gas transport. The present study develops a macroscopic-scale model of porous ceria undergoing thermal reduction. The model captures the coupled interactions between the heat and mass transfer and the heterogeneous chemistry using a local thermal non-equilibrium (LTNE) formulation of the volume averaged conservation of mass and energy equations in an axisymmetric cylindrical domain. The results of a representative test case simulation demonstrate strong coupling between gas phase mass transfer and the chemical kinetics as well as the pronounced impact of optical thickness on the temperature distribution and thus global solar-to-chemical energy conversion.
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Turner, Cameron J., Nafiseh Masoudi, Hannah Stewart, Julia Daniels, David Gorsich, Denise Rizzo, Greg Hartman, et al. "A Synthetic Tradespace Model for Tradespace Analysis and Exploration." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-91080.
Анотація:
Abstract Tradespace analysis and exploration is used to frame a design problem. By taking stock of available technologies, predictions of the performance of a system defined from a combinatorial combination of technologies (from say a morphological matrix) can be made. Based on these assessments, tradeoffs between functional performance objectives (often termed simply Functional Objectives or FOs) can be made. The result of these performance tradeoffs or Trades, can then be used to define a target design space for a problem. That design space can then be characterized with criteria to determine the viability of the tradespace and the design problem. However, the cost to develop the morphological matrix for the tradespace can be prohibitive. The tradespace at the US Army DEVCOM Ground Vehicle Systems Center (GVSC) took more than 2 years of effort by multiple staff and technical experts to develop and allows for the consideration of more than 1021 vehicles. To develop enhanced approaches to tradespace analysis and exploration to enhance programmatic decision-making, a simulated tradespace based on “synthetic data” is necessary. For tradespace studies within the Clemson University Virtual Prototyping of Ground Systems (VIPR-GS) it was necessary to develop a synthetic tradespace model to serve as a basis for evaluating improved approaches to tradespace analysis, exploration and decision-making methods. Within this work, we describe the state-of-the-art for developing models of the tradespace, formulations of functional objectives and defined models to represent different synthetic variable types to produce a synthetic tradespace with far less effort. Using this approach, we demonstrate the development of an example of a synthetic tradespace for small semi-autonomous ground vehicles developed within the VIPR Center that can be used to evaluate vehicle designs for the Clemson Deep Orange Project Vehicle and at GVSC. Finally, we will explore how this tradespace model can be used to facilitate decision-making surrounding the tradespace in the future.