Letteratura scientifica selezionata sul tema "90C47"
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Articoli di riviste sul tema "90C47":
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Oyewole, Olawale K., Mebawondu Akindele Adebayo e Oluwatosin T. Mewomo. "A strong convergence algorithm for approximating a common solution of variational inequality and fixed point problems in real Hilbert space". Studia Universitatis Babes-Bolyai Matematica 69, n. 1 (15 marzo 2024): 183–209. http://dx.doi.org/10.24193/subbmath.2024.1.12.
Abstract (sommario):
In this paper, we propose an iterative algorithm for approximating a common solution of a variational inequality and fixed-point problem. The algorithm combines the subgradient extragradient technique, inertial method and a modified viscosity approach. Using this algorithm, we state and prove a strong convergence algorithm for obtaining a common solution of a pseudomonotone variational inequality problem and fixed-point of an η-demimetric mapping in a real Hilbert space. We give an application of this result to some theoretical optimization problems. Furthermore, we report some numerical examples to show the efficiency of our method by comparing it with previous methods in the literature. Our result extends, improves and unifies many other results in this direction in the literature. Mathematics Subject Classification (2010): 47H09, 49J35, 90C47. Received 21 May 2021; Accepted 14 July 2021
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Stommel, John R., e Robert J. Griesbach. "New Ornamental Capsicum Germplasm: Lines 90C40, 90C44, and 90C53". HortScience 28, n. 8 (agosto 1993): 858–59. http://dx.doi.org/10.21273/hortsci.28.8.858.
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Hoehn, Larry. "90.47 A cyclic property of equilateral polygons". Mathematical Gazette 90, n. 518 (luglio 2006): 308–9. http://dx.doi.org/10.1017/s0025557200179811.
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Arnzen, Rüdiger. "PROCLUS ON PLATO'S TIMAEUS 89e3–90c7". Arabic Sciences and Philosophy 23, n. 1 (marzo 2013): 1–45. http://dx.doi.org/10.1017/s0957423912000069.
Abstract (sommario):
AbstractAlthough the existence of an Arabic translation of a section of Proclus' commentary on Plato's Timaeus lost in the Greek has been known since long, this text has not yet enjoyed a modern edition. The present article aims to consummate this desideratum by offering a critical edition of the Arabic fragment accompanied by an annotated English translation. The attached study of the contents and structure of the extant fragment shows that it displays all typical formal elements of Proclus' commentaries, whereas its conciseness and shortcomings raise certain doubts about its completeness. As a parergon, the article includes an analysis of a hitherto neglected letter by Ḥunayn ibn Isḥāq, which is attached to the fragment in the manuscript transmission. In addition to providing some insight into the origins of the Proclian fragment, this letter sheds some light on the Syriac and Arabic reception of some works by Hippocrates and Galen, especially Hippocrates' On Regimen in Acute Diseases and the history of its Arabic translation.
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Anggraini, Reska Ayu, Nofri Yuhelman e Jumriana Rahayu Ningsih. "PENGEMBANGAN MEDIA VIDEO ANIMASI MENGGUNAKAN APLIKASI KINEMASTER PADA MATERI HIDROKARBON DI SMAN 1 INUMAN". Journal of Chemistry Education and Integration 1, n. 1 (19 febbraio 2022): 26. http://dx.doi.org/10.24014/jcei.v1i1.15929.
Abstract (sommario):
Abstract This research on the development of animated video media using the kinemaster application aims to determine the feasibility of chemistry learning media on hydrocarbon materials for SMAN 1 Inuman. The data collection instruments used were material expert validation sheets, media expert validation sheets, linguist validation sheets and student response validation sheets. The data analysis technique used is by calculating the percentage score of the validation assessment. The results showed that the validation results met the valid categories of material experts by 91.93%, media experts by 90.00%, and linguists by 90.47%. This learning media also meets the valid category from the results of student responses with validation gains of 91.59%. Based on these results, it can be concluded that the animated video learning media is very suitable to be used as a medium for learning chemistry on hydrocarbon materials.Keywords: Learning Media, Animation Videos, Kinemaster, Hydrocarbons AbstrakPenelitian pengembangan media video animasi menggunakan aplikasi kinemaster ini betujuan untuk mengetahui kelayakan dari media pembelajaran kimia pada materi hidrokarbon di SMAN 1 Inuman. Instrumen pengumpulan data yang digunakan berupa lembar validasi ahli materi, lembar validasi ahli media, lembar validasi ahli bahasa dan angket respon siswa. Teknik analisis data yang digunakan yaitu dengan cara menghitung skor persentase penilaian validasi. Hasil penelitian menunjukkan bahwa dari hasil perolehan validasi memenuhi kategori valid dari ahli materi sebesar 91,93%, ahli media sebesar 90,00%, dan ahli bahasa sebesar 90,47%. Media pembelajaran ini juga memenuhi kategori valid dari hasil respon siswa dengan perolehan validasi sebesar 91,59%. Berdasarkan hasil perolehan tersebut, dapat disimpulkan bahwa media pembelajaran video animasi sangat valid digunakan sebagai media pembelajaran kimia pada materi hidrokarbon. Keywords: Media Pembelajaran, Video Animasi, Kinemaster, Hidrokarbon
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Sudarto, Sudarto. "Peningkatan keterampilan sosial melalui permainan gobak sodor". JPPM (Jurnal Pendidikan dan Pemberdayaan Masyarakat) 5, n. 1 (8 marzo 2018): 85–95. http://dx.doi.org/10.21831/jppm.v5i1.10374.
Abstract (sommario):
Penelitian ini bertujuan untuk meningkatkan keterampilan sosial melalui permainan gobak sodor. Penelitian ini merupakan penelitian tindakan kelas yang dilakukan dalam dua siklus. Subjek penelitian ini adalah anak kelompok B TK Panca Setya Kabupaten Sintang yang berjumlah 21 anak. Pengumpulan data dilakukan dengan teknik observasi, wawancara, dan dokumentasi. Analisis data menggunakan teknik deskriptif. Hasil penelitian ini menunjukkan bahwa permainan gobak sodor dapat meningkatkan keterampilan sosial pada anak kelompok B TK Panca Setya Kabupaten Sintang. Hasil ini ditunjukkan dengan hasil peningkatan keterampilan sosial pratindakan bahwa dari 21 anak, 3 anak (14,28%) pada kategori sangat baik. Hasil siklus 1 keterampilan sosial anak meningkat menjadi 10 anak (47,61%) pada kategori baik. Hasil siklus 1 ke siklus 2 mengalami peningkatan keterampilan sosial pada kategori sangat baik menjadi 20 anak (90,47%). Eliciting social skills through gobag sodor game AbstractThe research aimed at eliciting the children’s social skills through gobag sodor game. The study was a classroom action research that consisted of two cycles. The subjects in the study were the students from Group B of Panca Setya Kindergarten the Regency of Sintang and the number of the subjects was 21 children. The data were gathered through observation, interview, and documentation and were analysed using the descriptive technique. The results of the study show that the gobag sodor game is able to elicit the children’s social skill in Group B of Panca Setya Kindergarten in the Regency of Sintang. These results are confirmed by the following findings in terms of social skills. In the pre-action cycle, from 21 subjects 3 subjects 914.28%) belong to very good category. Then, the results of the first cycle show that from 21 subjects 10 subjects (47.61%) belong to good category. Last but not the least, from the first cycle to the second cycle it is found that 20 subjects (90.47%) belong to the very good category.
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Espitia De La Hoz., Franklin José. "Efecto de la terapia combinada en la vaginosis bacteriana recurrente en mujeres del Eje Cafetero, Colombia". Revista de Obstetricia y Ginecología de Venezuela 83, n. 01 (23 febbraio 2023): 18–27. http://dx.doi.org/10.51288/00830105.
Abstract (sommario):
Objective: To evaluate the effect of combined therapy in recurrent bacterial vaginosis in women from the Coffee Region (Colombia). Methods: Observational study, in 189 women over 18 years, diagnosed with recurrent bacterial vaginosis following the Nugent score. They were given combination therapy (oral induction with 500 mg metronidazole for seven days plus 600 mg vaginal boric acid once daily for twenty-one days, followed by 500 mg nifuratel and 200,000 IU vaginal nystatin for six days, every month, for six months); who attended consultation between 2017 and 2020. Clinical and laboratory follow-up was performed using Nugent’s score, one week after the end of oral treatment, at one month, three, six, nine and twelve months. Descriptive statistics were used. Results: The mean age of participants was 34.17 ± 5.31 years. The cure rate after initial therapy was 80.42% (at week), at month: 82.01 %, three months: 91.53 %, six: 90.47 %, nine: 90.47 % and at twelve months: 86.24 %. At the end of the study, the failure rate was 9.52%. There were no serious adverse events; the satisfaction rate was high (90.47 %). Conclusions: Combination therapy in recurrent bacterial vaginosis improved clinical and microbiological cure and decreased the risk of recurrence at twelve months follow-up. Validation of the present results is required in a randomized controlled clinical trial.
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Shubina, I., K. Titov, L. Demidov, I. Mikhailova e M. Kiselevsky. "9047 Intrapleural IL-2 immunotherapy of patients with malignant effusion". European Journal of Cancer Supplements 7, n. 2 (settembre 2009): 519. http://dx.doi.org/10.1016/s1359-6349(09)71760-4.
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Hamadou, André, Kossivi Dosseh, Samuel M. Bouh, Judith F. Ahounou Aïkpe, Cyrille J. Ndu Djerayom, Joachim D. Gbenou e Pierre H. Dansou. "Prévalence des troubles musculo-squelettiques et facteurs de risque chez les conducteurs de motos taxis dans la ville de Yaoundé". International Journal of Biological and Chemical Sciences 17, n. 3 (24 agosto 2023): 1072–83. http://dx.doi.org/10.4314/ijbcs.v17i3.25.
Abstract (sommario):
Les troubles musculo-squelettiques (TMS) constituent la première cause de morbidité liée au travail et occupent la première place des maladies professionnelles. L’objectif de cette étude était d’évaluer la prévalence des TMS chez les conducteurs de motos taxis à Yaoundé. Une étude transversale, descriptive et analytique a été conduite auprès de ces acteurs et les données ont été recueillies par un questionnaire nordique sur la santé musculo-squelettique. Au total, 357 conducteurs de motos taxis ont pris part à cette étude, dont la moyenne d’âge est de 28,4 ± 4 ans. Les résultats ont montré une prévalence des TMS de 90,47% chez les participants. Les régions corporelles les plus affectées étaient le haut du dos (86,3%), les coudes (78,7%), le bas du dos (62,2%), les épaules (55,2%), les poignets/mains (52,1%). Les facteurs de risque associés aux TMS étaient l’âge ; le surpoids ; l’ancienneté, la fréquence de travail, la pratique sportive. La prévalence des TMS chez les participants reste élevée dans ce milieu où la conduite de motos taxis est devenue de plus en plus un métier rémunérateur pour la population confrontée à un taux de chômage élevé. Il est important d’agir sur les facteurs de risque afin de prévenir efficacement les TMS.
English title: Prevalence of musculoskeletal disorders and risk factors among motorcycle riders in the city of Yaounde
Musculoskeletal disorders (MSDs) are the leading cause of work-related morbidity and rank first among occupational diseases. The objective of this study was to assess the prevalence of MSDs among motorcycle riders in the city of Yaounde. A cross-sectional, descriptive and analytical study was conducted with these actors and the data was collected by a Nordic Questionnaire on musculoskeletal health. A total of 357 motorcycle riders took part in this study, with an average age of 28.4 ± 4 years. The results showed a prevalence of MSDs of 90.47% among the participants. The most affected body regions were upper back (86.3%), elbows (78.7%), lower back (62.2%), shoulders (55.2%), wrists /hands (52.1%). Risk factors associated with MSDs were age, overweight, seniority, frequency of work, sports practice. The prevalence of MSDs among participants remains high in this environment where motorcycle riding has increasingly become a remunerative profession for the population faced with a high unemployment rate. It is important to act on the risk factors in order to effectively prevent MSDs.
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Schneiderman, Jennifer, Wendy B. London, Garrett M. Brodeur, Robert P. Castleberry, A. Thomas Look e Susan L. Cohn. "Clinical Significance of MYCN Amplification and Ploidy in Favorable-Stage Neuroblastoma: A Report From the Children's Oncology Group". Journal of Clinical Oncology 26, n. 6 (20 febbraio 2008): 913–18. http://dx.doi.org/10.1200/jco.2007.13.9493.
Abstract (sommario):
Purpose MYCN amplification is rarely detected in patients with favorable-stage neuroblastoma (NB). To determine the clinical significance of MYCN amplification in children with favorable-stage NB, we performed a retrospective review of data from the Pediatric Oncology Group (POG) biology study 9047. Patients and Methods MYCN status, tumor cell ploidy, treatment, and outcome of patients with stage A, B, or Ds NB, enrolled on POG 9047 between 1990 and 1999 were analyzed. Event-free survival (EFS) and overall (OS) survival rates were analyzed using the Kaplan-Meier method. Results Of the 1,667 patients enrolled on POG 9047, 643 had favorable-stage disease. Of these, follow-up data were available on 568 (34%) with stage A, B, or Ds disease and normal MYCN copy number, and 32 (1.9%) patients with MYCN-amplified, stage A, B, or Ds tumors. Within the cohort lacking MYCN amplification, the 7-year EFS and OS rates (± SE) were 91% ± 1% and 96% ± 1%, respectively. Patients with MYCN amplification had significantly worse EFS and OS (50% ± 9% and 59% ± 9%, respectively, P < .0001). Within the cohort of children with MYCN amplification, the 7-year EFS and OS rates were 80% ± 10% and 87% ± 9%, respectively for patients with hyperdiploid tumors and 25% ± 11% and 38% ± 12% for patients with diploid/hypodiploid NBs (P = .0063 and P = .0074, respectively). Conclusion Tumor cell ploidy may be a clinically useful factor for prognostication and treatment stratification in children with MYCN-amplified, favorable-stage NB tumors.
Tesi sul tema "90C47":
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Neirac, Lucie. "Learning with a linear loss function : excess risk and estimation bounds for ERM and minimax MOM estimators, with applications". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAG012.
Abstract (sommario):
La détection de communautés sur des graphes, la récupération de phase, le clustering signé, la synchronisation angulaire, le problème de la coupe maximale, la sparse PCA, ou encore le single index model, sont des problèmes classiques dans le domaine de l'apprentissage statistique. Au premier abord, ces problèmes semblent très dissemblables, impliquant différents types de données et poursuivant des objectifs distincts. Cependant, la littérature récente révèle qu'ils partagent un point commun : ils peuvent tous être formulés sous la forme de problèmes d'optimisation semi-définie positive (SDP). En utilisant cette modélisation, il devient possible de les aborder du point de vue classique du machine learning, en se basant sur la minimisation du risque empirique (ERM) et en utilisant la fonction de perte la plus élémentaire: la fonction de perte linéaire. Cela ouvre la voie à l'exploitation de la vaste littérature liée à la minimisation du risque, permettant ainsi d'obtenir des bornes d'estimation et de développer des algorithmes pour résoudre ces problèmes. L'objectif de cette thèse est de présenter une méthodologie unifiée pour obtenir les propriétés statistiques de procédures classiques en machine learning basées sur la fonction de perte linéaire. Cela s'applique notamment aux procédures SDP, que nous considérons comme des procédures ERM. L'adoption d'un “point de vue machine learning” nous permet d'aller plus loin en introduisant d'autres estimateurs performants pour relever deux défis majeurs en apprentissage statistique : la parcimonie et la robustesse face à la contamination adversaire et aux données à distribution à queue lourde. Nous abordons le problème des données parcimonieuses en proposant une version régularisée de l'estimateur ERM. Ensuite, nous nous attaquons au problème de la robustesse en introduisant un estimateur basé sur le principe de la "Médiane des Moyennes" (MOM), que nous nommons l'estimateur minmax MOM. Cet estimateur permet de faire face au problème de la robustesse et peut être utilisé avec n'importe quelle fonction de perte, y compris la fonction de perte linéaire. Nous présentons également une version régularisée de l'estimateur minmax MOM. Pour chacun de ces estimateurs, nous sommes en mesure de fournir un “excès de risque” ainsi que des bornes d'estimation, en utilisant deux outils clés : les points fixes de complexité locale et les équations de courbure de la fonction d'excès de risque. Afin d'illustrer la pertinence de notre approche, nous appliquons notre méthodologie à cinq problèmes classiques en machine learning, pour lesquels nous améliorons l'état de l'artCommunity detection, phase recovery, signed clustering, angular group synchronization, Maxcut, sparse PCA, the single index model, and the list goes on, are all classical topics within the field of machine learning and statistics. At first glance, they are pretty different problems with different types of data and different goals. However, the literature of recent years shows that they do have one thing in common: they all are amenable to Semi-Definite Programming (SDP). And because they are amenable to SDP, we can go further and recast them in the classical machine learning framework of risk minimization, and this with the simplest possible loss function: the linear loss function. This, in turn, opens up the opportunity to leverage the vast literature related to risk minimization to derive excess risk and estimation bounds as well as algorithms to unravel these problems. The aim of this work is to propose a unified methodology to obtain statistical properties of classical machine learning procedures based on the linear loss function, which corresponds, for example, to the case of SDP procedures that we look as ERM procedures. Embracing a machine learning view point allows us to go into greater depth and introduce other estimators which are effective in handling two key challenges within statistical learning: sparsity, and robustness to adversarial contamination and heavy-tailed data. We attack the structural learning problem by proposing a regularized version of the ERM estimator. We then turn to the robustness problem and introduce an estimator based on the median of means (MOM) principle, which we call the minmax MOM estimator. This latter estimator addresses the problem of robustness and can be constructed whatever the loss function, including the linear loss function. We also present a regularized version of the minmax MOM estimator. For each of those estimators we are able to provide excess risk and estimation bounds, which are derived from two key tools: local complexity fixed points and curvature equations of the excess risk function. To illustrate the relevance of our approach, we apply our methodology to five classical problems within the frame of statistical learning, for which we improve the state-of-the-art results
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Bulian, Francesca. "Analisi geochimica ed ambientale di sedimenti ed acque del lago di Veovaca (Vares- Bosnia ed Erzegovina)". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9047/.
Abstract (sommario):
Il lavoro svolto nella zona di Vareš, in particolare nella zona del lago di Veovača ha investigato diverse matrici ambientali (sedimenti, suoli, acque) per valutare le loro caratteristiche e la loro qualità. Nella zona è stata presente in passato attività estrattiva e di lavorazione dei minerali estratti, da qui la necessità di questo studio esplorativo. Il lavoro svolto si divide in tre fasi: campionamento, svolto in quattro giorni passati in campagna; analisi dei campioni raccolti e interpretazione dei risultati. Sono state campionate acque e sedimenti in punti interni al lago, altri in corrispondenza delle sue sponde e punti lungo la diga. Sul materiale solido sono state svolte analisi di spettrometria di fluorescenza a raggi X, mentre sulle acque sono state applicate tecniche di spettrometria di assorbimento atomico (AAS), spettrometria di emissione al plasma induttivamente accoppiato (ICP-AES) e cromatografia ionica oltre che a misure di parametri chimico-fisici in campo. Sono stati poi valutati i risultati, attraverso il confronto con banche dati di riferimento ed elaborazioni statistiche e grafiche.
Si tratta di uno studio preliminare effettuato su un piccolo numero di campioni e perciò solo indicativo e non in grado di fornire risposte definitive sulla condizione ambientale dell'area. Tuttavia queste prime informazioni consentono di delineare un quadro nel quale future indagini potranno approfondire aspetti e problemi critici per la qualità ambientale.
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Guerberof, Arenas Ana. "Productivity and quality in the post-editing of outputs from translation memories and machine translation". Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/90247.
Abstract (sommario):
This study presents empirical research on no-match, machine-translated and translation-memory segments, analyzed in terms of translators’ productivity, final quality and prior professional experience. The findings suggest that translators have higher productivity and quality when using machine-translated output than when translating on their own, and that the productivity and quality gained with machine translation are not significantly different from the values obtained when processing fuzzy matches from a translation memory in the 85-94 percent range. The translators’ prior experience impacts on the quality they deliver but not on their productivity. These quantitative findings are triangulatedwith qualitative data from an online questionnaire and from one-to-one debriefings with the translators.
Este estudio presenta una investigación empírica sobre la traducción de segmentos nuevos y aquellos procesados con traducción automática y memorias de traducción analizados en relación a la productividad, calidad final y experiencia profesional de un grupo de traductores. Los resultados sugieren que los traductores obtienen una productividad y calidad más altas cuando procesan segmentos de traducción automática que cuando traducen sin ninguna ayuda y que dicha productividad y calidad no son significativamente diferentes a la que se obtiene cuando procesan coincidencias parciales de una memoria de traducción (del 85 al 94 por ciento). La experiencia profesional previa de los traductores influye en la calidad pero no así en la productividad obtenidas. Los resultados cuantitativos se triangulan, además, con datos cualitativos obtenidos a través de un cuestionario en línea y de entrevistas individuales realizadas a los trad
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Ferrarese, Renata Flavia Milani Silva [UNESP]. "Caracterização do aporte de poluentes oriundos da atividade sucroalcooleira para a atmosfera, água, solo e sedimento". Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/90047.
Abstract (sommario):
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ferrarese_rfms_me_sjrp.pdf: 569531 bytes, checksum: 2da8f73d485e4749222432b449999a7a (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O Brasil vem apresentando crescimento no cultivo de cana-de-açúcar, bem como no número de usinas instaladas no país, ocupando hoje a posição de maior produtor mundial. O Estado de São Paulo destaca-se como o maior produtor do país, onde a Bacia Hidrográfica do Turvo/Grande é a 3ª maior do Estado. Com tal crescimento também veio a exigência do mercado externo sobre a produção sustentável, ou seja, necessidade de dar destinos adequados para os resíduos gerados em todo processo produtivo. Dentre os principais resíduos gerados na indústria sucroalcooleira destacam-se os efluentes líquidos, principalmente a água de lavagem (proveniente da limpeza de máquinas da indústria, da lavagem da cana, piso, entre outros) e a vinhaça (proveniente da destilação do álcool), sendo esta última apresentando um potencial poluidor muito elevado para os compartimentos ambientais (água, solo, ar). Visando o entendimento da dinâmica dos poluentes nesta região, este trabalho tem como objetivo principal avaliar a contribuição da atividade sucroalcooleira no aporte de poluentes para os compartimentos ambientais, como água, atmosfera, solo e sedimento na Bacia Hidrográfica do Turvo/Grande. Neste contexto, amostras de água superficial e subterrânea, solo, sedimento, deposição atmosférica total e tecido vegetal foram coletadas no período de novembro/09 a outubro/10. Os resultados de deposição atmosférica total indicam que a atividade sucroalcooleira tem papel fundamental no aporte dos elementos quantificados, uma vez que, para a maioria dos parâmetros, a média ponderada pelo volume (MPV) no período de safra foi 4,5-9,5% maior do que a MPV do período de entressafra. A água de lavagem e a vinhaça apresentaram grandes variações nas concentrações mínimas e máximas...
Brazil has been an increase in the sugar cane cultivation, as well as the number of ethanol industry installed in the country. São Paulo state is the largest producer in the country, where the Turvo/Grande watershed is the 3rd largest producer in this state. The reasons for growth also came from demand of foreign markets about sustainable production and need to appropriate destinations for the waste generated throughout the production process. The main waste generated in the ethanol industry is wastewater, especially washes water (cleaning machines, washing sugarcane and floor and others from industrial process) and vinasse (derived from alcohol distillation), being this wastewater shows high pollution potential for environmental matrices. For understanding pollutants dynamics in the region, this study conducts at assessing the contribution of sugarcane and ethanol activity in the input of pollutants into water, atmosphere, soil and sediment in Turvo/Grande watershed. In this context, samples of surface water, groundwater, soil, sediment, total atmospheric deposition and plant tissue were collected in the period from November 2009 to October 2010. Results indicate that total atmospheric deposition acts intake for most parameters, since the volume-weighted mean (VWM) was 4.5 to 9.5% greater during the harvest period compared to the non-harvest period. Wash water and vinasse showed large variations in minimum and maximum concentrations obtained, where the largest variations to vinasse was of TOC analysis (11,117 a 30,466 mg L-1) and the wash water was conductivity (796 a 4,240 µS cm-1). For surface water and groundwater, the biggest variation occurred for nitrate, with higher values during the harvest period (10.6 and 14.4 mg L-1, respectively (value Ntotal). The contribution... (Complete abstract click electronic access below)
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Araújo, Taciana Belluci de [UNESP]. "O desenvolvimento do raciocínio moral por meio da técnica da discussão moral: estudo realizado com alunos do ensino fundamental, na disciplina de Língua Portuguesa". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/90147.
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araujo_tb_me_rcla.pdf: 1446448 bytes, checksum: b3d421c53380047ad9c5493923c1a86b (MD5)É visível a preocupação com um modelo de Educação que tenha como princípio a formação da cidadania. Surge, portanto, no meio escolar, a necessidade de se produzir ações que focalizem o ensino de valores morais, dentro desse contexto, uma vez que aos educadores e a todos os agentes envolvidos com a Educação é atribuída a tarefa de se educar ética e moralmente os indivíduos. E este é o interesse desta pesquisa, que apresenta uma alternativa de intervenção pedagógica que culmina na prática da discussão de dilemas morais encontrados no enredo das Fábulas Italianas, compiladas por Ítalo Calvino em 1954. Os objetivos que permearam todo o desenrolar desta pesquisa foram: identificar o nível evolutivo da noção de justiça em que se encontram os sujeitos participantes, de acordo com as teorias de Piaget e Kohlberg, em duas classes do Ensino Fundamental (uma experimental e outra de controle), dentro de uma instituição pública de ensino e verificar se o trabalho pedagógico com o enredo de algumas fábulas italianas, por meio da técnica da discussão moral, implica em uma evolução qualitativa no nível do raciocínio moral. Para tanto, os sujeitos participaram de um pré-teste que corresponde às respostas dadas aos dilemas de Kohlberg. Posteriormente, participaram da intervenção pedagógica e, por último, realizaram o pós-teste com os mesmos questionamentos aplicados no pré-teste. A análise qualitativa dos dados baseou-se nesses depoimentos fornecidos pelos sujeitos, tendo o cuidado de acompanharmos o raciocínio e a estrutura de seu pensamento, caracterizando o seu estágio de raciocínio moral antes e depois de todo o trabalho de intervenção pedagógica, relacionando-os sempre com as teorias de Piaget e Kohlberg e com a teoria da análise de conteúdo de Bardin (1977). Observou-se, ao final dessa pesquisa, que os sujeitos que participaram da Classe Experimental...
It is clearly identifiable the existence of a strong concern towards the existence of an Education model that aims for citizenship development. As a consequence, the school environment holds the need for actions that focus on the teaching of moral values, considering that educators and other teaching-related agents have the difficult task of teaching their pupils both ethic and morally. The present research attempts to introduce an alternative pedagogical intervention which results in the discussion of moral dilemmas taken from the plot of Italian Folktales, compiled by Italo Calvino in 1954. One of the objectives pursued throughout this research was: to identify the level of justice maturity of each participant according to Piaget and Kohlberg theories in two groups of Secondary school (being one the experimental group and other the control group) from a public school. The second objective was to assess the pedagogical work with the plot of some Italian folktales - through moral discussion method - as a means of qualitative evolution in the level of moral reasoning. In order to achieve this result, the participants sat for a pre-test which fits Kohlberg dilemmas‟ answers. Afterwards, they were involved in a data gathering process during the period of pedagogical intervention and in the end, they sat for a post-test involving the same questions previously applied in the pre-test. The datum qualitative analysis was based on the testimony provided by participants. During the analysis, the reasoning and the structure of their thinking were closely observed in order to qualify their stage of moral reasoning before and after all the work of pedagogical intervention, applying Piaget and Kohlberg theories as well as the theory of content analysis by Bardin (1977). At the end of this research, it was observed that all the experimental group participants achieved a superior moral reasoning... (Complete abstract click electronic access below)
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Carlindo, Eva Poliana [UNESP]. "Tornar-se professora: o capital cultural como esteio explicativo para o sucesso docente". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/90247.
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carlindo_ep_me_arafcl.pdf: 529145 bytes, checksum: 38f0c00cfa08e3c6d0a5673c262a0d6a (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho de natureza qualitativa pretende contribuir com reflexões que estão sendo sistematizadas cujo objeto de estudo é a formação e a atuação docente. O objetivo desse trabalho é investigar se os modos de ser professor relacionam-se com as experiências formativas vivenciadas pelo professor ao longo de sua trajetória de vida privada e profissional e se tais experiências influenciaram a angariação de capital cultural e a estruturação do habitus professoral. Para tanto, optamos pelo referencial teórico bourdieusiano por contemplar aspectos relacionados aos processos formativos a que o agente social está submetido, tais como, campo social, trajeto social, habitus e angariação de diferentes tipos de capital. Nessa perspectiva, realizamos entrevistas semiestruturadas de caráter autobiográfico com quatro professoras atuantes na última série do primeiro ciclo do ensino fundamental de uma escola municipal situada em um município de pequeno porte no interior paulista a fim de que pudéssemos “reconstruir” parte da vida dos sujeitos entrevistados. A esse propósito, para a realização das entrevistas formulamos três macroeixos norteadores: trajetória pessoal; trajetória escolar e acadêmica e trajetória profissional, justamente, por se relacionarem às experiências educacionais, escolares e não-escolares; ao exercício da docência; à carreira docente e ao processo de angariação de capital cultural. Por sua vez, a análise dos dados, realizada por meio da técnica Análise de Conteúdo, segundo a proposta de Laurence Bardin, permite-nos afirmar que a titulação acadêmica apresentou-se como estratégia de ascensão social para as professoras entrevistadas por permitir a angariação de diferentes tipos de capital, entre eles, capital simbólico, capital econômico e, sobretudo, capital cultural de caráter institucionalizado e, ao mesmo tempo, por ser capaz...
The intent of this native qualitative work is to contribute with reflections that have been systemized which study`s object is the teacher formation and performance. The objective of this study is to explore the possibility of the teacher methods be related to his formative experiences obtained by himself during the life/professional and if these experiences affected the cultural capital gathering and the professorial habitus arrangement. Therefore, we chose by the bourdieusin theoretical referential due to the consideration of aspects related to the formative processes which the social agent is submitted, such as, social ground, social path, habitus and the gathering for different types of capital. In this overview, we performed semi-structured interviews with autobiography characteristic for four active teachers in the last year of the elementary education in a local school which is located in a small São Paulo inner city in order that we could “redo” part of the interviewers` lives. This purpose, we developed three macro guiding principles to perform the interviews: personal path, scholar path and academic and professional path, certainly relate to educational experiences, scholars and non- scholars, the teaching profession, teacher career and the gathering for the capital ethnical. On the other hand, the data analysis were made by Content Analysis technique, as proposed by Laurence Bardin, and allow us to say that the academic title was showed as strategy of social rise for interviewed teachers to allow the gathering of different types of capital, among, symbolic capital, economic capital and, especially, cultural institutionalized capital and to be capable to give to the social agents the social distinctions among their class members. However, the teaching profession requires dedication from the social agent with some changes/restructuration of his primary... (Resumo completo, clicar acesso eletrônico abaixo)
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Ueno, Cristina Sayuri [UNESP]. "Um estudo sobre a saúde do professor a partir da perspectiva da sociologia sensível de Michel Maffesoli". Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/90347.
Abstract (sommario):
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ueno_cs_me_arafcl.pdf: 502103 bytes, checksum: 924e79ce231b192f773d7e114f344987 (MD5)Através desta pesquisa procuramos compreender a saúde e o adoecimento do professor, inseridos num processo complexo, no qual se relacionam o cotidiano escolar e o macro contexto de políticas públicas voltadas para a educação. Isto se deu a partir dos resultados obtidos pelas pesquisas já realizadas acerca do tema, que apontavam como fatores ligados ao desgaste do professor tanto a falta de infra-estrutura, as jornadas extensas, a falta de reconhecimento social, quanto a indisciplina e a violência dentre os muros escolares. Para realização deste estudo, foi contatada uma escola pública de ensino médio localizada no interior de São Paulo e utilizados como recursos metodológicos a observação (em sala de aula, sala dos professores, pátio e Escola da Família), com elaboração de um diário de campo, e a aplicação de entrevistas semi-estruturadas junto a três professoras. Estas professoras aderiram voluntariamente à pesquisa. Encontramos muitos dos elementos relatados pela literatura referentes à sintomatologia (distúrbios fonoaudiológicos, osteoarticulares, psiquiátricos, alergias, cansaço e desânimo constantes), e também ao ambiente de trabalho hostil. Por outro lado, os professores, ao mesmo tempo em que se diziam cansados e doentes, também se diziam satisfeitos e realizados com seu trabalho. Diante da diversidade de informações, nos pautamos na Sociologia do Cotidiano de Michel Maffesoli, por considerar a contradição, ambivalência, multiplicidade de sentidos como constituintes da existência, para refletir a respeito da situação encontrada, admitindo o caráter pontual e contextualizado de nossas conclusões. Diante disto, acreditamos que a promoção da saúde do professor necessita acontecer na própria escola, entre seus pares, e passa necessariamente por novos modos de organizar seu trabalho. Ou seja, é uma questão que não pode ser analisada apenas no nível da individualidade.
Through this research, we try to understand the health and the process in which the teacher falls ill, inserted in a complex process, in which the school daily life and the macro context of public policies, whose aim is education, are related. This was done from the results obtained by the research already carried out on this subject, which pointed as factors that were connected with the stress of the teacher; lack of infrastructure, long working hours, lack of social recognition, and the indiscipline and violence inside the school walls. For the accomplishment of this study, a public middle school, located in the interior of Sao Paulo was contacted, and the methodological resources used were the observation (in classroom, staff room, patio and School of the Family) with preparation of a field diary, and the application of semi-structured interviews to three teachers. These teachers voluntarily joined the research. We found many of the elements reported by the literature referring to the symptomatology (speech problems, bone and joint problems, psychiatric disturbances, constant allergies, tiredness, and dejection), and also to the hostile work environment. On the other side, at the same time the teachers claimed they were tired and ill, they claimed they were satisfied and fulfilled with their work. In view of the variety of information, we base ourselves on the Sociology of the Daily Life by Michel Maffesoli, considering the contradiction, ambivalence, multiplicity of senses as constituent elements of existence, to reflect on the considered situation, admitting the punctual character and contextualization of our conclusions. Considering this, we believe that the promotion of the teacher's health needs to happen in the school itself, among their peers, and it necessarily involves new ways of organizing the teacher's work. In other words, an issue that cannot be analyzed only in the individuality level.
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Silva, Marísia Cristina da [UNESP]. "Desempenho operacional de semeadora-adubadora de precisão em função do tipo de martelete e velocidade de deslocamento na cultura do milho". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/90447.
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silva_mc_me_botfca.pdf: 1187348 bytes, checksum: b926169213d8acbaf9358f1d270ff76d (MD5)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Na operação de semeadura, o estande adequado e a uniformidade de distribuição de sementes são componentes de grande influência na produtividade do milho. Esses fatores podem ser afetados por inúmeras variáveis, sendo a velocidade de operação da semeadora-adubadora uma das mais importantes, além da adequação semente/orifício no disco dosador. A velocidade de deslocamento e a regulagem da semeadora, sendo inadequadas, podem proporcionar baixa população de plantas, acarretando em uma produtividade não desejada. O presente trabalho teve como objetivo analisar o desempenho operacional de uma semeadora-adubadora de precisão, em função de cinco velocidades de deslocamento e dois tipos de martelete, utilizada para a semeadura da cultura do milho em sistema plantio direto. O experimento foi instalado e conduzido em área experimental pertencente à Faculdade de Ciências Agronômicas, UNESP – Botucatu, SP, no período de dezembro de 2007 a maio de 2008. O solo da área experimental foi classificado como Nitossolo Vermelho Distroférrico, textura muito argilosa. O delineamento experimental utilizado foi de blocos ao acaso, com parcelas subdivididas, em esquema fatorial 2x5, sendo dois tipos de marteletes (4 e 5 dentes) e cinco velocidades de deslocamento (3,0; 4,5; 5,0; 7,0 e 9,0 km h-1) com quatro repetições. Assim, o experimento teve 10 tratamentos, totalizando 40 parcelas experimentais. Foram avaliados os dados referentes à porcentagem de cobertura do solo, profundidade do sulco de semeadura, área de solo mobilizado e de deposição de sementes, consumo horário e operacional de combustível, força na barra de tração do trator, velocidade de deslocamento, capacidade de campo efetiva, distribuição longitudinal de sementes, número médio de dias para emergência de plântulas, componentes morfológicos e componentes de produção da planta de milho, danos mecânicos nas...
In the sowing operation, the appropriate stand and the uniformity on the distribution of seeds are mentioned as factors of great influence on the corn yield.. These factors can be affected by several variables, being the planter displacement velocity one of the most important of them, besides the adjustment of seeds in the perforated disc device for seed dosage. The inadequate displacement velocity and adjustment of the planter may provide low population of plants, leading to an undesired yield. The current paper had as its objective to analyze the precision planter’s operational and energetically performances according to five different displacement velocities and two types of jumpers used for planting no-tillage corn.The experiment was installed and conducted at the experimental area belonging to the College of Agricultural Science - UNESP located in Botucatu, Sao Paulo state, in the period comprised between December, 2007 and May, 2008. The experimental soil area was classified as Nitossolo Vermelho Distroférrico presenting a deep argillaceous texture. The experimental design consisted of blocks at random with parcels subdivided in factorial scheme 2x5, two types of jumpers (4 and 5 staples) and 5 different displacement velocities (3,0; 4,5; 5,0; 7,0 e 9,0 Km h-1) with four repetitions. Thus, the experiment was composed by 10 treatments, totalizing 40 experimental plots. The evaluated data regarded to the percentage of soil coverage, the sowing line depth, mobilized soil and seed overthrown area, horal and operational fuel consumption, force on the tractor traction bar, displacement velocity, effective field capacity, longitudinal distribution of seeds, average number of days for the emergence of seedlings, morphological and corn production components, mechanical harm on seeds and grain production. The displacement velocity effect was verified on the following variables: horal... (Complete abstract click electronic access below)
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Souza, Sivoney Ferreira de [UNESP]. "Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/90547.
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souza_sf_me_botfca.pdf: 1653750 bytes, checksum: 3aa87de3ba9ede42d6a64a6e7aef2e61 (MD5)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O momento atual de maior preocupação ambiental global, a crescente escassez dos recursos fósseis, bem como as novas regulagens ambientais força a busca por materiais que sejam renováveis e compatíveis com o ambiente. Novos materiais estão sendo desenvolvidos a partir de várias fontes naturais e, entre eles a celulose é o mais abundante dos polímeros naturais e um dos mais utilizados. Logo, o objetivo desta dissertação de mestrado foi obter nanofibras de celulose tendo como fonte a fibra vegetal de curauá. Os processos utilizados foram químicos e mecânicos, baseados nos processos de polpação e branqueamento, a fim de isolar a celulose, seguido de processos mecânicos para atingir a escala nanométrica. As nanofibras de celulose propiciam vantagens como melhoria nas propriedades mecânicas e de barreira, além de manter a transparência de polímeros em geral. A fim de comprovar a capacidade de reforço em matrizes poliméricas, as nanofibras de celulose obtidas foram incorporadas nas mesmas. No entanto, para evitar a tendência de aglomeração das nanofibras, principalmente quando retiradas do meio aquoso, o álcool polivinílico (pva) foi escolhido como a matriz polimérica a ser testada, devido à sua compatibilidade com nanofibras de celulose, por ambos serem de natureza hidrofílica, o que aumenta a compatibilidade interfacial de fases entre a nanocelulose e a matriz escolhida. Após a incorporação das nanofibras na matriz polimérica ocorreram significativas melhoras nas propriedades mecânicas da matriz. Ao incorporar 4% de nanofibras da celulose de curauá obteve-se um ganho de 36% e 67% para a tração e para o módulo de young, respectivamente. Com 5% de nanofibras, o aumento nas propriedades foram ainda mais significativos em torno de 44% para a tração máxima e 448% para o módulo de young
Nowadays is a era of greatest environmental concern, with growing scarcity of fossil resources, as well as new environmental regulations obligating the search for materials that are renewable and environmentally friendly. New materials are being developed from various natural sources, and among them, cellulose is the most abundant natural polymers and the one most used. Therefore, the purpose of this thesis was to obtain cellulose nanofibers fibers from curaua plant. The procedures used were based on chemical and mechanical treatment. Pulping and bleaching, in this sequence were done in order to isolate the cellulose, followed by mechanical processes to achieve the nanometer scale. The cellulose nanofibers provide advantages such as improvement of mechanical properties and barrier, besides maintaining transparency of polymers in general. To prove the capacity of reinforcement in polymer matrices, the cellulose nanofibers obtained were incorporated into them. However, to avoid the tendency of nanofibers agglomeration when removed from water, the polyvinyl alcohol (PVA) was chosen as the polymer matrix to be tested, for the reasons that both are hydrophilic in nature and compatible to cellulose nanofibers, which increases the interface between the matrix and the nanocelulose chosen. After the incorporation of nanofibers in the polymer matrix, a significant improvement were observed in its mechanical properties by incorporating 4% of cellulose nanofiber curauá which provided a gain of 36% and 67% for tension and Young's modulus, respectively. With 5% of nanofibers, the increase in properties was even more significant at around 44% for maximum tension and 448% for Young's modulus
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Ceragioli, Natalia Sousa [UNESP]. "Qualidade de cavacos produzidos em sistemas florestais de curta rotação de eucalipto para fins energéticos". Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/90647.
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000756934.pdf: 1452179 bytes, checksum: 821c01bc2b142723fd36a737540c3fc0 (MD5)Este estudo teve como objetivo avaliar densidade de carga da produção de cavacos em função da granulometria de dois sistemas florestais de curta rotação de Eucalyptus urograndis. Um ensaio foi realizado em Botucatu- SP, o plantio da área em ocorreu em julho 2010, com espaçamento de 2,8 x 1,5 m, e com 30 meses a área foi colhida, com a utilização de uma carreta com células de carga e com volume conhecido e foi realizada pesagens para seis dimensões de cavacos (5 mm, 10 mm, 15 mm, 20 mm, 25 mm e 33 mm) tendo três repetições para cada, para poder determinar a densidade de carga. Em janeiro de 2010, foi implantado em Taiobeiras- MG, o outro ensaio, com os diferentes clones (I-144, I-224, I-042 e I-60) no espaçamento de 4,0 x 0,5 m com a finalidade de produção de bioenergia na forma cavacos de 33 mm. A colheita foi realizada com 37 meses, com uma carreta de volume conhecido e uma balança rodoviária para determinar a densidade de carga. Para os dois ensaios foi utilizado o mesmo sistema mecanizado específico para produção de cavaco. Os resultados foram analisados pela análise de variância e, posteriormente, teste de Tukey. Concluindo que quanto maior dimensão dos cavacos menor a densidade de carga e que numa mesma situação para diferentes clones da mesma espécie de eucalipto se encontra diferentes valores de densidade de carga
This study aimed to evaluate the bulk density of a wood chip production as a function of particle size of two short forestry rotation system of Eucalyptus urograndis. One trial was conducted in Botucatu-SP, the planting area occurred in July 2010, with spacing of 2.8 x 1.5 m, and within 30 months the area was harvested with the use of a trailer with load cells and known volume, and was weighing carried out for six dimensions chip (5 mm, 10 mm, 15 mm, 20 mm, 25 mm and 33 mm) with three replicates for each, in order to determine the bulk density. In January 2010, it was deployed in Taiobeiras-MG, the second test, with different clones (I-144, I-224, I-042 and I-60) at a spacing of 4.0 x 0.5 m with purpose of bioenergy production in 3 the form of 33 mm wood chips. The harvest was performed 37 months, with a cartload of known volume and scale road to determine the bulk density. For both tests the same specific mechanical system was used to produce chip. The results were analyzed by analysis of variance and then the Tukey test. In conclusion that the larger dimension of the wood chips minus the bulk density and in the same situation for different clones of the same species of eucalyptus is different values of bulk density.
Libri sul tema "90C47":
1
Zubiri, X. El problema filosofico de la historia de las religiones. Madrid: Alianza, 1993.
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Rosina, Matilde. The Criminalisation of Irregular Migration in Europe. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90347-3.
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Ruben, David-Hillel. The Metaphysics of Action. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90347-7.
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Marin, Marin, e Andreas Öchsner. Essentials of Partial Differential Equations. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-90647-8.
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Ponta, Gheorghe M. L., e Bogdan P. Onac, a cura di. Cave and Karst Systems of Romania. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-90747-5.
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Gugutzer, Robert. Leib, Körper und Identität. Wiesbaden: VS Verlag für Sozialwissenschaften, 2002. http://dx.doi.org/10.1007/978-3-322-90147-7.
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Przyborski, Aglaja. Gesprächsanalyse und dokumentarische Methode. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7.
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Struck, Olaf, Gesine Stephan, Christoph Köhler, Alexandra Krause, Christian Pfeifer e Tatjana Sohr. Arbeit und Gerechtigkeit. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90447-4.
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Krott, Max, e Michael Suda, a cura di. Macht Wissenschaft Politik? Wiesbaden: VS Verlag für Sozialwissenschaften, 2007. http://dx.doi.org/10.1007/978-3-531-90547-1.
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Rosenberg, Eric. A Survey of Fractal Dimensions of Networks. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90047-6.
Capitoli di libri sul tema "90C47":
1
Przyborski, Aglaja. "Einleitung". In Gesprächsanalyse und dokumentarische Methode, 13–14. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_1.
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Przyborski, Aglaja. "Problemstellung, Gegenstand und epistemologische Reflexion". In Gesprächsanalyse und dokumentarische Methode, 15–45. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_2.
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Przyborski, Aglaja. "Die Diskursanalyse der dokumentarischen Methode". In Gesprächsanalyse und dokumentarische Methode, 47–94. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_3.
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Przyborski, Aglaja. "Modi der Diskursorganisation". In Gesprächsanalyse und dokumentarische Methode, 95–287. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_4.
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Przyborski, Aglaja. "Modus der Diskursorganisation und Repräsentation von Erfahrungsräumen". In Gesprächsanalyse und dokumentarische Methode, 289–316. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_5.
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Przyborski, Aglaja. "Forschungsperspektiven". In Gesprächsanalyse und dokumentarische Methode, 317–21. Wiesbaden: VS Verlag für Sozialwissenschaften, 2004. http://dx.doi.org/10.1007/978-3-531-90347-7_6.
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von Stephan, Gesine, Olaf Struck e Christoph Köhler. "Warum eine Studie zum Thema „Arbeit und Gerechtigkeit“?" In Arbeit und Gerechtigkeit, 11–16. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90447-4_1.
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von Stephan, Gesine, Olaf Struck e Christoph Köhler. "Theoretischer Bezugsrahmen und methodischer Ansatz". In Arbeit und Gerechtigkeit, 17–32. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90447-4_2.
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von Krause, Alexandra, Christian Pfeifer e Tatjana Sohr. "Was beeinflusst die Akzeptanz von Entlassungen und Lohnkürzungen?" In Arbeit und Gerechtigkeit, 33–69. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90447-4_3.
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von Sohr, Tatjana. "Gender und Gerechtigkeit". In Arbeit und Gerechtigkeit, 71–86. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90447-4_4.
Atti di convegni sul tema "90C47":
1
"Front Matter: Volume 9047". In International Conference on Optical Instruments and Technology (OIT2013), a cura di Zhiping Zhou e Changhe Zhou. SPIE, 2013. http://dx.doi.org/10.1117/12.2054611.
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Botros, K. K., H. Golshan, B. Sloof, Z. Samoylove e D. Rogers. "Natural Gas Compressor Operation Optimization to Minimize Gas Turbine Outboard Bleed Air". In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90047.
Abstract (sommario):
Gas turbine (GT) engines employed in natural gas compressor stations operate in different modes depending on the power, turbine inlet temperature and shaft speeds. These modes apply different sequencing of bleed valve opening on the air compressor side of the engine. Improper selection of the GT and the driven booster compressor operating conditions can lead to larger bleed losses due to wider bleed valve openings. The bleed loss inevitably manifests itself in the form of higher overall heat rate of the GT and greater engine emission. It is therefore imperative to determine and understand the engine and process conditions that drive the GT to operate in these different modes. The ultimate objective is to operate the engine away from the inefficient modes by adjusting the driven booster compressor parameter as well as the overall station operating conditions (i.e. load sharing, control set points, etc.). This paper describes a methodology to couple the operating conditions of the booster compressor to the modes of GT bleed valve opening (and the subsequent air bleed rates) leading to identification of the operating parameters for optimal performance (i.e., best overall efficiency and minimum CO2e emission). A predictive tool is developed to quantify the overall efficiency loss as a result of the different bleed opening modes, and map out the condition on the gas compressor characteristics. One year’s worth of operating data taken from an existing compressor station on TransCanada Pipelines’ Alberta system was used to demonstrate the methodology. This station employs GE-LM1600 gas turbine driving a Cooper Rolls-RFBB-30 centrifugal compressor. The results from the analysis conclusively indicate that there are operating regions on the gas compressor map where losses due to bleed valves are reduced and hence lower CO2 emissions, which presents an opportunity for operation optimization.
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Goodfellow, Graham, Susannah Turner, Jane Haswell e Richard Espiner. "An Update to the UKOPA Pipeline Damage Distributions". In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90247.
Abstract (sommario):
The United Kingdom Onshore Pipeline Operators Association (UKOPA) was formed by UK pipeline operators to provide a common forum for representing operators interests in the safe management of pipelines. This includes providing historical failure statistics for use in pipeline quantitative risk assessment and UKOPA maintain a database to record this data. The UKOPA database holds data on product loss failures of UK major accident hazard pipelines from 1962 onwards and currently has a total length of 22,370 km of pipelines reporting. Overall exposure from 1952 to 2010 is of over 785,000 km years of operating experience with a total of 184 product loss incidents during this period. The low number of failures means that the historical failure rate for pipelines of some specific diameters, wall thicknesses and material grades is zero or statistically insignificant. It is unreasonable to assume that the failure rate for these pipelines is actually zero. However, unlike the European Gas Incident data Group (EGIG) database, which also includes the UK gas transmission pipeline data, the UKOPA database contains extensive data on measured part wall damage that did not cause product loss. The data on damage to pipelines caused by external interference can be assessed to derive statistical distribution parameters describing the expected gouge length, gouge depth and dent depth resulting from an incident. Overall 3rd party interference incident rates for different class locations can also be determined. These distributions and incident rates can be used in structural reliability based techniques to predict the failure frequency due to 3rd party damage for a given set of pipeline parameters. The UKOPA recommended methodology for the assessment of pipeline failure frequency due to 3rd party damage is implemented in the FFREQ software. The distributions of 3rd party damage currently used in FFREQ date from the mid-1990s. This paper describes the work involved in updating the analysis of the damage database and presents the updated distribution parameters. A comparison of predictions using the old and new distributions is also presented.
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Librais, Valter, Sergio Ricardo Lourenço e Claudemir Duca Vasconcelos. "AHP Method: Application in Pipeline Projects in Brazil". In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90547.
Abstract (sommario):
This article considers that the most cost-effective way to transport products of fossil fuels, liquids or gases, is by a pipeline system which provides high operational reliability, lower power consumption and less environmental impact consequently. It becomes more and more necessary implementing new pipeline projects in Brazil. In the early seventies, discussions have started regarding the pressure for reduction of costs and pursuit of sustainable development, linked to the Triple Bottom Line, which uses economic, environmental and social dimensions. So far, the decisions in several sectors of the oil industry have been taken based on just one criteria, usually economical. This study proposes the establishment of a multicriteria analysis to be used in future pipeline deployments in Brazil, aiming to support the decision makers by supplying them quantifiable and unquantifiable criteria. For the development of this analysis, it will be used the Analytic Hierarchy Process (AHP) in which the various relevant criteria are represented through relative weigh. A project of a new pipeline will be used as a case study to demonstrate the application of the proposed model. The organizations can use the result of the analysis as an input to decision-making on future ductwork ventures in Brazil, especially in terms of environmental and social dimensions.
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Gross, Johann, e Malte Krack. "Multi-Wave Vibration Caused by Flutter Instability and Nonlinear Tip Shroud Friction". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90247.
Abstract (sommario):
Abstract Measurements revealed the contribution of multiple traveling waves to the flutter vibrations of bladed disks. Saturated flutter vibration, whether in this multi-wave or in its better-understood single-wave form, is a nonlinear phenomenon. However, it is still not understood of what physical origin the relevant nonlinearities are, and under what conditions single-wave or multi-wave flutter vibration occurs. Recent theoretical work suggests that multi-wave flutter vibration can be explained by strongly nonlinear frictional inter-blade coupling. The verity of this hypothesis is strictly limited by the simplicity of the considered model, namely a cyclic chain of seven oscillators with frictional coupling and rather unrealistic aeroelastic behavior. In the present work, it is demonstrated that nonlinear dynamical contact interactions at tip shrouds are a likely cause for the observed multi-wave flutter vibration. To this end, a more realistic structural turbine blade row model with a more realistic aeroelastic behavior is considered. Some insight into its intriguing dynamics, dependence of limit states on initial conditions and eigenvalue placement is provided. For instance, it is shown that there is an intimate relation between internal combination resonance conditions of certain traveling wave modes and the spectral content of single- and multi-wave flutter oscillations.
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Prabhakar, Arun, Stephen Ambrose e Herve Morvan. "Numerical Investigation of Two Phase Flow in a Dual Drive Booster (DDB)". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90347.
Abstract (sommario):
Abstract Recent efforts have been devoted in developing cutting edge methods and technologies to overcome the complications involved in extracting power from the spools in turbofan engines to drive the power systems in aircraft. In a contemporary turbofan engine design, a Dual Drive Booster turbofan (DDBTF) summation gear box is employed to derive power from the low pressure (LP) and high pressure (HP) spools. This paper aims to investigate the scavenging of lubrication oil from the Dual Drive Booster gearbox. It is essential that that the scavenging of oil from the gearbox is efficient to eradicate risks that may arise when oil resides in the gear box for prolonged durations. Longer residence times of oil in the gearbox can lead to rapid oil degradation. Simulations were conducted on a previously optimized geometry and the work in this paper will focus on investigating the effect of different operating conditions on the scavenging performance of the scavenge chamber. The effect of attitude, altitude and the inlet flow rate of oil have been simulated to understand their influence on the oil flow behavior. Emphasis is given on the predicting potential oil churning, recirculation and pooling behaviors in the scavenge chamber that encloses the gear box. Numerical Investigations are carried out using ANSYS Fluent. The Volume of Fluid (VOF) multiphase model is employed to model the multiphase flow arising between air and oil in the system and the effects of turbulence are modelled using the standard k-ϵ model. The computational domain is discretized using a polyhedral grid comprising of 4 million cells which was adopted based on grid independency tests that were conducted prior to the main simulations. Validation against published experimental data for similar flow regimes was also carried out. Results indicate that the scavenging performance is not affected significantly under the various operating conditions and scenarios that were investigated. This is because the effects of the windage outweigh the effects caused by the different operating conditions that are imposed to the scavenge chamber. The windage in the system drives the oil efficiently out from the chamber with the aid of the tangential sump (shown in Figure 4). Oil is distributed in an axially central section of the chamber and the total residence mass of oil is compared and under 0.5 kg for all the cases presented in this paper.
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Kaiser, Thomas Ludwig, Kilian Oberleithner, Laurent Selle e Thierry Poinsot. "Examining the Effect of Geometry Changes in Industrial Fuel Injection Systems on Hydrodynamic Structures With BiGlobal Linear Stability Analysis". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90447.
Abstract (sommario):
Abstract Shape optimization with respect to the suppression or enhancement of dynamical flow structures is an important topic in combustion research and beyond. In this paper, we investigate the flow in an industrial fuel injection system by experimental means, as well as Large Eddy Simulation (LES) and Linear Stability Analysis (LSA) for two configurations of the swirler. In the first configuration, the reference geometry, a Precessing Vortex Core (PVC) occurs. In the second configuration, a center body is mounted in the interior of the injector. It is shown by both experiments and LES that the PVC is suppressed in the presence of the center body, while the mean flow remains nearly unaffected. The method of LSA is applied in order to explain the effect of the geometry change. The work shows that LSA is capable of explaining the occurrence or disappearance of coherent structures evolving on the turbulent flows if the geometry is changed. This is an important step in using LSA in the context of shape optimization of industrial fuel injectors.
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Chen, Haoxiang, Weilin Zhuge, Yangjun Zhang e Hongdan Liu. "Effect of Compressor Inlet Condition on Supercritical Carbon Dioxide Compressor Performance". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90647.
Abstract (sommario):
Abstract Supercritical carbon dioxide (S-CO2) Brayton power cycle has attracted a lot of attention around the world in energy conversion field. It takes advantage of the high density of CO2 near the critical point while maintaining low viscosity to reduce compressor power and achieve high cycle efficiency. However, as CO2 approaches to its critical point, the thermodynamic properties of CO2 vary dramatically with small changes in temperature or pressure. As a result, the density of the working fluid varies significantly at the compressor inlet in the practical cycle if operating near the critical point, especially for small-scale cycles and air-cooled cycles, which leads to compressors operating out of the flow range, even being damaged. Concerns of large density variations at the inlet of the compressor result in S-CO2 compressor designers selecting compressor inlet conditions away from the critical point, thereby increasing compressor power. In this paper, a criterion to choose inlet pressure and inlet temperature of compressors as the design inlet condition is proposed, which is guaranteeing ±50% change in inlet specific volume within ±3 °C variation in inlet temperature. By the criterion, 8 MPa and 34.7 °C is selected as the design inlet condition. According to design requirements of the cycle, a S-CO2 centrifugal compressor is designed through 1-D design methodology. Based on the two-zone model, the effects of compressor inlet condition including inlet pressure and inlet temperature on the compressor performance are analyzed in detail. In practical operation, the compressor inlet condition is varied. Thus, an accurate prediction of compressor performance under different inlet conditions is necessary. The traditional correction method is not suitable for S-CO2 compressor. Dimensionless specific enthalpy rise is used to correct pressure ratio by the real gas table. And the S-CO2 compressor performance can be predicted correctly under different inlet conditions.
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Odier, Nicolas, Thierry Poinsot, Florent Duchaine, Laurent Gicquel e Stéphane Moreau. "Inlet and Outlet Characteristics Boundary Conditions for Large Eddy Simulations of Turbomachinery". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90747.
Abstract (sommario):
Abstract Inlet an outlet boundary conditions are essential elements of any CFD predictions and this is even more so for turbomachinery Large Eddy Simulations, either applied to academic or industrial configurations. For compressible solvers, non-reflecting, characteristic inlet boundary condition imposing total pressure, total temperature and flow direction is usually needed, while an outlet relaxation methodology that automatically adapts the outlet static pressure as a function of the desired mass-flow rate rate is used for turbomachinery flow predictions. Establishing such a framework is clearly desirable especially for industrial use of LES. Development and validations remain necessary in such a fully unsteady context as detailled hereafter.
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Vogelpoth, Andreas, Johannes Henrich Schleifenbaum e Silja Rittinghaus. "Laser Additive Manufacturing of Titanium Aluminides for Turbomachinery Applications". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90947.
Abstract (sommario):
Abstract The defect-free processing of TiAl alloy TNM™-B1 by means of Laser Powder Bed Fusion (LPBF) is demonstrated by manufacturing of an automobile turbocharger wheel. Similar precision cast material was used as reference. TNM™-B1 was manufactured crack free with a density > 99.5% using elevated process temperatures above the brittle-to-ductile transient temperature (BDTT). The preheating temperature was provided by an induction preheating system. To minimize oxygen pick up during the LPBF process, the process atmosphere was actively cleaned using a gas-purification system. Produced test samples were analyzed in as-built and heat-treated condition regarding density, micro structure and phases by means of a Light Optical Microscope (LOM) and Scanning Electron Microscopy (SEM). Micro hardness was measured according to Vickers. Oxidation measurements were performed by means of carrier-gas hot extraction. Mechanical properties were determined using room temperature tensile tests. The final automobile turbocharger wheel was analyzed for defects using a Micro-Computer Tomography scanner (MCT). Besides bulk test samples, thin-walled specimens can be manufactured with sufficient density. Depending on the process parameters, an oxygen content < 1000 ppm could be reached. The as-built microstructure consists of lamellar (α2+γ) colonies and nearly globular γ as well as β/β0 at the grain boundaries. High cooling rates in the magnitude of 105 to 106 K/s provide small grain sizes of 1–7 μm. Hardness measurements reveal an increased hardness (515-560HV0.3) compared to cast material (390HV0.3). Samples for tensile tests show tensile strength around 840 MPa and a total elongation of 1.1% for LPBF-manufactured and hot isostatic pressed (HIP) samples. The CT analysis of the turbocharger wheel confirms that complex geometries made of TiAl can be additively manufactured free of cracks.