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Статті в журналах з теми "91A15":
1
Nuryanto, Apri. "Evaluasi Microteaching Terintegrasi Media Sosial." Jurnal Dinamika Vokasional Teknik Mesin 5, no. 1 (March 31, 2020): 69–75. http://dx.doi.org/10.21831/dinamika.v5i1.30997.
Анотація:
This study aims to evaluate the implementation of social media-integrated microteaching, viewing it from the effectiveness, efficiency and practicality aspects. This research is a quantitative descriptive study. The data collection methods used are using instruments that were distributed to students undertaking the social media-integrated microteaching course. The population in this study were 15 students as respondents. The evaluation results showed an effectiveness level of 91.15, the efficiency of 91.43, and practicality of 94.44.Penelitian ini bertujuan untuk mengetahui evaluasi pelaksanaan microteaching yang diintegrasikan dengan media sosial yang dilihat dari efektifitas, efisiensi dan kepraktisan microteaching yang diintegrasikan dengan media sosial. Penelitian ini termasuk penelitian kuantitatif. Metode yang digunakan dengan menggunakan instrument yang dibagikan kepada mahasiswa yang mengambil matakuliah microteaching yang diintegrasikan dengan media sosial. Responden ada sebanyak 15 mahasiswa. Hasil penelitian menunjukkan tingkat efektivitas sebesar 91,15 , efisiensi sebesar 91,43 dan kepraktisan sebesar 94,44.
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Simons, Stuart. "91.15 Making toast." Mathematical Gazette 91, no. 520 (March 2007): 110–12. http://dx.doi.org/10.1017/s0025557200181112.
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Pratama, Frendy Anang, Wasis Djoko Dwiyogo, and Supriyadi Supriyadi. "Media Pembelajaran Bulutangkis dalam Bentuk Multimedia Interaktif pada Mahasiswa." Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan 4, no. 3 (March 30, 2019): 382. http://dx.doi.org/10.17977/jptpp.v4i3.12147.
Анотація:
<p class="Abstract"><strong>Abstract:</strong> This research was aimed to develop teaching materials for badminton material in the form of interactive multimedia. The results of the badminton expert validation showed a percentage of 91.89%, learning experts showed a percentage of 89.58% and the results of media expert validation showed a percentage of 87.80%. With the results of the validation, the product is feasible to be tested. Furthermore, for product trials, the percentage of small group trials was 90.10% and the percentage of large group trials was 91.15%.</p><p><strong>Abstrak: </strong>Penelitian ini bertujuan untuk mengembangkan bahan pembelajaran untuk materi bulutangkis ke dalam bentuk multimedia interaktif. Hasil validasi ahli bulutangkis menunjukkan persentase sebesar 91,89%, ahli pembelajaran menunjukkan persentase sebesar 89,58% dan hasil validasi ahli media menunjukkan persentase sebesar 87,80%. Dengan hasil validasi tersebut maka produk layak untuk diujicobakan. Selanjutnya, untuk uji coba produk, persentase ujicoba kelompok kecil sebesar 90,10% dan persentase ujicoba kelompok besar sebesar 91,15%.</p>
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Kwong, Christina, Alice Gilman-Sachs, and Kenneth Beaman. "Mechanism of a2V-ATPase in Sterile Inflammation (91.15)." Journal of Immunology 182, no. 1_Supplement (April 1, 2009): 91.15. http://dx.doi.org/10.4049/jimmunol.182.supp.91.15.
Анотація:
Abstract Key to our understanding the immune response during cell injury is the recognition of the unique mechanism used by the body to detect and respond to cell destruction. We show data that a vacuolar ATPase (a2V) is responsible for detecting aseptic cell injury and directs the activities which can lead to both tissue repair and disease pathogenesis. Rapid clearance of cellular debris is a crucial event to prevent host proteins from being recognized by immune cells to prevent unnecessary inflammation. a2V is a key protein that is up-regulated during sterile inflammation. After membrane receptors detect proximal cell death, a2V migrates to the plasma membrane and the N-terminus (a2NTD) is cleaved and secreted into the extracellular space. a2NTD stimulates primary human monocytes to secrete IL-1β. a2NTD also stimulates THP-1 cells in a concentration-dependent manner to up-regulate pro-inflammatory genes including IL-8, MCP-1 and MMP-9. We show a2NTD binding to monocytes cell surface that is reversible in a competition binding assay via flow cytometry and fluorescent microscopy. These data show involvement of CD14 with a2NTD binding and possible interaction between a2NTD's receptor and the inflammasome. We describe a new pathway by which monocytes respond to tissue destruction. Secretion of a2NTD represents a vital pathway utilized by tissues to initiate immune responses after cell injury.
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Tampi, Aprillia A., Nego E. Bataragoa, Jety K. Rangan, Unstain N. W. J. Rembet, Stephanus V. Mandagi, and Farnis B. Boneka. "Food Habits of Lencam Lethrinus rubrioperculatus Sato, 1978 (Fish: Lethrinidae)." Jurnal Ilmiah PLATAX 11, no. 1 (November 22, 2022): 39–45. http://dx.doi.org/10.35800/jip.v11i1.43931.
Анотація:
This study was conducted to determine the type and composition of food contained in the stomach of the Spotchheek emperor Lethrinus rubrioperculatus in Napo Keluar Nain Likupang waters based on sex and body size. Samples were taken from the catch of fishermen and then the fish samples were then taken to the laboratory for data collection. The method used to determine the composition of fish food used the Index of preponderance (IP). The results showed that the food habits of Spotchheek emperor in Napo Luar Nain Likupang waters with the types of food contained in the stomach of Spotchheek emperor, namely fish, shrimp, gastropods, Polychaeta, crabs (megalopa), and octopus where the main food of Spotchheek emperor is IP fish (94,16%). While the main food based on sex and length of body size is fish, with male IP 96.98% and female 91.15% respectively, while based on body length of Spotchheek emperor where small IP 91.06%, medium IP 98.45% and large IP 82.22%. Keywords: Food, Likupang, preponderance Abstrak Penelitian ini dilakukan untuk mengetahui jenis dan komposisi makanan yang terdapat dalam lambung ikan lencam Lethrinus rubrioperculatus di Napo Keluar Nain Perairan Likupang berdasarkan jenis kelamin dan ukuran tubuh. Sampel diambil dari hasil tangkapan nelayan kemudian sampel ikan selanjutnya dibawah ke Labolatorium untuk pengambilan data. Metode yang digunakan untuk mengetahui komposisi makanan ikan digunakan indeks bagian terbesar (IBT). Metode ini digunakan untuk menilai bermacam-macam jenis makanan ikan. Hasil penelitian menunjukan bahwa kebiasaan makanan ikan lencam di Napo Keluar Nain Perairan Likupang dengan jenis makanan yang terdapat dalam lambung ikan lencam yaitu ikan, udang, gastropoda, polychaeta, kepiting (megalopa) dan octopus di mana makanan utama dari ikan lencam adalah ikan IBT (94,16%). Sedangkan makanan utama berdasarkan jenis kelamin dan panjang ukuran tubuh yaitu ikan, dengan masing-masing IBT jantan 96,07% dan betina 91,15% sedangkan berdasarkan panjang ukuran tubuh ikan lencam IBT kecil 91,98%, sedang 98,45% dan besar 82,22%. Kata kunci: Makanan, Likupang, Indeks Bagian Terbesar.
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Rosyidina, Widda, Wulansari Prasetyaningtyas, and Bonita Paratejasari Anisa. "Kualitas Hasil Tas Makrame Berbahan Pelepah Pisang Menggunakan Teknik Makrame." Fashion and Fashion Education Journal 10, no. 1 (July 26, 2021): 41–45. http://dx.doi.org/10.15294/ffej.v10i1.32937.
Анотація:
Abstract: The purpose of this study was to determine the quality of the results of bags made from banana fronds using macrame technique. This research method is experimental research, the type of experiment in this study is pure research, namely the experiment of making bags made from banana fronds using macrame technique, in this experiment making bags with 3 models namely models A, B, and C, using the basic ingredients of banana fronds. This research variable uses a single variable that is the quality of a bag made from banana midrib, this variable does not affect or be influenced by other variables. Data collection methods in the researchers' documentation and questionnaire (questionnaire). The data analysis technique uses descriptive percentages. The results of research on bags were tested for quality by 39 respondents. The results of the quality test analysis showed that the overall bag product was very high, with an average value of 87.05% -91.15%. The highest quality studies were found in bag model C with an average value of 91.15%, the criteria were very high, then bag A with an average value of 87.05, and bag B with an average value of 90.00%. The conclusion from this study is that the highest quality is found in the C model bag with a percentage value of 91.15%. Keywords: baggage quality, banana fronds, macrame technique.
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Cahyanti, Fadhila Tri, Supriyadi Supriyadi, and Ema Novita Deniati. "Peran Diskusi Suami Istri terhadap Kepatuhan Kunjungan Antenatal Care (ANC)." Sport Science and Health 3, no. 10 (October 31, 2021): 814–25. http://dx.doi.org/10.17977/um062v3i102021p814-825.
Анотація:
Abstract: Every marriage must experience various problems that occur especially in the wrong communication between husband and wife. A true communication must be well established, especially during the wife's pregnancy, especially for the husband. The East Java Provincial Health Office stated that the K4 coverage for East Java Province was 91.15 percent. Pamekasan Regency is a Regency in East Java that has less desire for visits to pregnant women's health services is 92,75 percent, while target MSS. This study uses an observational quantitative cross-sectional approach with a sample of 112 married couples determined using the technique Accidental Sampling. Data collection using questionnaires includes two parts, namely husband's discussion and wife's discussion, based on The results show that there is an influence between husband's discussion on ANC visits and there is no influence between wife's discussion on ANC visits with the meaning that there is a role for husband and wife discussions to encourage ANC visits. the health of the wife and fetus is healthy until the delivery is smooth. And improve and develop programs related to the promotion of maternal and child health (MCH).
Abstrak: Setiap pernikahan pasti mengalami berbagai masalah yang terjadi terutama pada komunikasi yang salah antara suami istri. Suatu komunikasi sejatinya harus terjalin dengan baik terutama pada masa kehamilan istri, terutama bagi suami. Dinas Kesehatan Provinsi Jawa Timur menyatakan bahwa cakupan K4 untuk Provinsi Jawa Timur sebesar 91,15. Kabupaten Pamekasan merupakan Kabupaten di Jawa Timur yang mempunyai hasrat kunjungan yang kurang terhadap pelayanan kesehatan ibu hamil adalah 92,75 persen, sedangkan sasaran SPM Penelitian ini menggunakan kuantitatif observasional pendekatan Cross Sectional dengan jumlah sampel 112 pasangan suami istri yang ditentukan dengan menggunakan teknik Accidental Sampling. Pengumpulan data menggunakan penyebaran kuesioner meliputi dua bagian yaitu diskusi suami dan diskus istri, berdasarkan hasil bahwa ada pengaruh antara diskusi suami terhadap kunjungan ANC dan tidak ada pengaruh antara diskusi istri terhadap kunjungan ANC dengan makna ada peran diskusi suami dan istri terhadap mendorong melakukan kunjungan ANC. Dan diharapkan dapat meningkatkan komunikasi dan motivasi kepada sang istri terhadap kepatuhan kunjungan ANC agar kesehatan istri dan janin sehat hingga persalinannya pun lancar. Dan meningkatkan dan mengembangkan program-program terkait promosi kesehatan Ibu dan Anak (KIA).
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Laks, André. "Une doxographie d’Aristote (Métaphysique, Nu 4, 1091a33-91b15) et le sens d’un καί". Revue des Études Grecques 122, № 2 (2009): 635–43. http://dx.doi.org/10.3406/reg.2009.7965.
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Wang, Liang, Sisi Que, Ziwei Ding, and Esmail Vessally. "Correction: Oxidative carboxylation of olefins with CO2: environmentally benign access to five-membered cyclic carbonates." RSC Advances 10, no. 18 (2020): 10806. http://dx.doi.org/10.1039/d0ra90023k.
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Nawale, Ganesh N., Saeed Bahadorikhalili, Pallabi Sengupta, Sandeep Kadekar, Subhrangsu Chatterjee, and Oommen P. Varghese. "Correction: 4′-Guanidinium-modified siRNA: a molecular tool to control RNAi activity through RISC priming and selective antisense strand loading." Chemical Communications 55, no. 67 (2019): 10028. http://dx.doi.org/10.1039/c9cc90352f.
Анотація:
Correction for ‘4′-Guanidinium-modified siRNA: a molecular tool to control RNAi activity through RISC priming and selective antisense strand loading’ by Ganesh N. Nawale et al., Chem. Commun., 2019, 55, 9112–9115.
Дисертації з теми "91A15":
1
Tinsi, Laura. "Modeling and optimal strategies in short-term energy markets." Electronic Thesis or Diss., Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAG005.
Анотація:
Cette thèse vise à fournir des outils théoriques pour soutenir le développement et la gestion des énergies renouvelables intermittentes sur les marchés court terme de l'électricité.Dans la première partie, nous développons un modèle d'équilibre exploitable pour la formation des prix sur les marchés infrajournaliers de l'électricité. Pour cela, nous proposons un jeu non coopératif entre plusieurs producteurs interagissant sur le marché et faisant face à une production renouvelable intermittente. En utilisant la théorie des jeux et celle du contrôle stochastique, nous dérivons des stratégies optimales explicites pour ces producteurs ainsi qu'un prix d'équilibre en forme fermée pour différentes structures d'information et caractéristiques des joueurs. Notre modèle permet de reproduire et d'expliquer les principaux faits stylisés du marché intraday tels que la dépendance temporelle spécifique de la volatilité et la corrélation entre le prix et les prévisions de production renouvelable.Dans la deuxième partie, nous étudions des prévisions probabilistes dynamiques sous la forme de processus de diffusion. Nous proposons plusieurs modèles d'équations différentielles stochastiques pour capturer l'évolution dynamique de l'incertitude associée à une prévision, nous dérivons les densités prédictives associées et nous calibrons le modèle sur des données météorologiques réelles. Nous l'appliquons ensuite au problème d'un producteur éolien recevant des mises à jour séquentielles des prévisions probabilistes de la vitesse du vent, utilisées pour prédire sa production, et prendre des décisions d'achat ou de vente sur le marché. Nous montrons dans quelle mesure cette méthode peut être avantageuse comparée à l'utilisation de prévisions ponctuelles dans les processus décisionnels.Enfin, dans la dernière partie, nous proposons d'étudier les propriétésdes réseaux de neurones peu profonds agrégés. Nous explorons le cadre PAC-Bayesien comme alternative à l'approche classique de minimisation du risque empirique. Nous nous concentrons sur les priors Gaussiens et dérivons des bornes de risque non asymptotiques pour les réseaux de neurones agrégés. Ces bornes donnent des vitesses de convergence minimax pour l'estimation dans des espaces de Sobolev.Cette analyse fournit également une base théorique pour le réglage des paramètres et offre de nouvelles perspectives pour des applicationsdes réseaux de neurones agrégés à des problèmes pratiques de haute dimension, de plus en plus présents dans les processus de décision liés à l'énergie et impliquant des moyens de production renouvelable ou du stockageThis thesis focuses on providing theoretical tools to help in the development and management of intermittent renewable energy in short term electricity markets.In the first part, we develop a tractable equilibrium model for price formation in intraday electricity markets. For this, we propose a non cooperative game between several producers interacting in the market and facing an intermittent renewable production. Using stochastic control and game theory, we derive explicit optimal strategies for these producers as well as a closed form equilibrium price for different information structures and player characteristics. Our model allows to reproduce and explain the main stylized features of the intraday market such as the specific time dependence of volatility and the correlation between the price and the renewable production forecasts.In the second part, we study dynamic probabilistic forecasts in the diffusion framework. We propose several stochastic differential equation models to capture the dynamic evolution of the uncertainty associated to a forecast, derive the associated predictive densities and calibrate the model on real meteorological data. We then apply it to the problem of a wind energy producer receiving sequential updates of the probabilistic forecasts of the wind speed used to predict her production and make trading decisions in the market. We show to what extent this method can outperform the use of point forecasts in decision-making processes.Finally, in the last part, we propose to study the propertiesof aggregated shallow neural networks. We explore thePAC-Bayesian framework as an alternative to the classicalempirical risk minimization approach. We focus on Gaussianpriors and derive non-asymptotic risk bounds for theaggregated neural networks. These bounds yield minimaxrates of estimation over Sobolev smoothness classes.This analysis also provides a theoretical basis for tuning theparameters and offers new perspectives for applicationsof aggregated neural networks to practical high dimensionalproblems increasingly present in energy decision problemsinvolving renewables or storage
2
Coneys, Matthew. "Mandeville in Italy : the Italian version of the Book of John Mandeville and its reception (c. 1388-1600)." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/91215/.
Анотація:
This thesis examines the Italian version of the Book of John Mandeville and its reception in the fifteenth and sixteenth centuries. Although the Book has been the subject of much critical investigation, the Italian redaction of the text has been largely ignored. Similarly, previous research into the reception of the Book has focused largely on its circulation in northern Europe. This study therefore aims both to bridge a gap in Mandeville studies and to make a valuable contribution to scholarly understanding of the circulation of vernacular literature in the Italian Renaissance. Research has been conducted along two principal lines. A close material analysis of surviving manuscript and printed copies of the Book has allowed the influence of individual actors on the text’s highly mutable content and form to be charted, revealing their specific attitudes and concerns. In addition to this, a broader survey of the Book’s influence on vernacular and Latin literary production in a number of genres has provided further evidence of Mandeville’s cultural impact. Following an Introduction that gives a more detailed analysis of the study’s scope, methodology and structure, Chapter 1 offers a broad overview of the Italian text and its manuscript and print circulation. The four following chapters each address a key theme in the Book’s reception, combining analysis of surviving manuscript and printed copies of the Book with a survey of its cultural impact. A Conclusion draws together these individual themes, offering some general considerations of the Book’s impact on Italian Renaissance culture and the place of the Italian version within the broader Mandeville tradition.
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Faulkner, Trudy. "Accurate spirometry assessment and interpretation for chronic disease management of chronic obstructive pulmonary disease in general practice : what are the barriers for practice nurses?" Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/91215/.
Анотація:
Spirometry (lung function assessment) is an essential tool for the chronic disease management of chronic obstructive pulmonary disease (COPD). Chronic disease monitoring for COPD was introduced in 2004 and included spirometry for target achievement and financial remuneration within the Quality and Outcomes Framework of the General Medical Services Contract. However, practice nurses have anecdotally struggled to gain competence and expertise with the spirometric procedure and interpretation post 2004, despite the successful achievement of financial targets within the general practice setting. A sequential exploratory mixed methods study (Tashakkori and Teddlie, 2003) was undertaken within a University Health Board in Wales to determine what, if any, barriers exist for practice nurses undertaking spirometry assessment and interpretation for the chronic disease management of COPD. Quantitative data were collected via an online questionnaire. Qualitative interviews were conducted and analysed using an analysis framework method (Ritchie et al, 2003). The methodological framework of the feminist transformative lens (Caracelli and Greene, 1997) was utilised to gain an understanding of the barriers practice nurses faced in the gaining of competence with spirometry assessment and interpretation within the wider professional context. The quantitative results confirmed the anecdotal reports of difficulty with spirometry and demonstrated that lack of training was the greatest reason for lack of confidence in spirometric interpretation, followed by lack of clinical time and lack of general practitioner (GP) support. The qualitative results demonstrated that practice nurses are commonly working as disenfranchised isolated practitioners within general practice teams, and are commonly undertaking a procedure in which they are not highly confident. Recommendations for development of future clinical practice are: mandatory training with assessment of competency to improve skills with spirometry, in addition to supervisory support and training of GP colleagues. Other recommendations include: a greater focus on inter-professional team working to reduce professional isolation and disenfranchisement of practice nurses, and for practice nurses to actively contribute to local and national initiatives to improve spirometry services in the long term.
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Bagnoli, Lucia. "Risolubilità delle equazioni polinomiali." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9115/.
Анотація:
Scopo di questo elaborato è studiare la risolubilità per radicali di un polinomio a coefficienti in un campo di caratteristica zero attraverso lo studio del gruppo di Galois del suo campo di spezzamento. Dopo aver analizzato alcuni risultati su gruppi risolubili e gruppi semplici, vengono studiate le estensioni radicali e risolubili. Viene inoltre dimostrato su un campo K di caratteristica zero il Teorema di Galois, che caratterizza i polinomi risolubili per radicali f a coefficienti in K attraverso la risolubilità del gruppo di Galois G(L/K), dove L è il campo di spezzamento di f. La tesi contiene anche un'esposizione sintetica del metodo introdotto da Lagrange per la risoluzione di equazioni polinomiali di cui si conosca il gruppo di Galois.
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Anshari, Buan. "Structural behaviour of glued laminated timber beams reinforced by compressed wood." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/9115/.
Анотація:
As an engineered wood product, glued laminated timber (Glulam) is produced to minimise several natural weaknesses such as knots and non-uniform strength in order to enhance its stiffness and load carrying capacity. Many reinforcement methods have been tested, with promising results in increasing the strength and stiffness of beam. Recently, with increasing concern on environmental protection there is a growing trend in construction to use as many natural materials as possible. Therefore, conventional types of reinforcement using metals and/or synthetic materials do not fit well with this trend. A new approach to strengthen Glulam beams using pure natural materials has been established through this research. Glulam beams were strengthened by inserting compressed wood (CW) blocks into the pre-cut rectangular holes on the top of the beams. This practice was to make use of moisture-dependent swelling nature of the compressed wood. As a result, a pre-camber was produced in the mid-span of the beam reinforced. Significant initial tensile and compressive stresses were generated at both the top and the bottom extreme fibres of the beam, respectively. Material tests have been done to investigate material properties of compressed Japanese cedar with different compression ratios. Structural tests were undertaken for short and long Glulam beams strengthened by CW blocks after gained the pre-camber. 3-D finite element models have also been developed by using commercial code ABAQUS to simulate the pre-stressing behaviour of Glulam beams reinforced using compressed wood blocks. The finite element models were used to simulate the structural behaviour of the pre-stressed beams subjected to subsequent destructive bending tests. All computer models developed were validated against corresponding experimental results of the free moisture-dependent swelling, pre-stressing processes and the destructive tests for both the short and long beams. Reasonably good correlation was obtained in terms of the free swelling, the pre-camber, initial stress state of the Glulam beams reinforced and load-deflection relationships. Using validated computer models, parametric studies were further carried out to provide design information for such a reinforcing technique. The results have indicated that the reinforcing techniques using compressed wood blocks are very effective means to enhance the initial stiffness, bending strength and load carrying capacity of Glulam beams. The technology is ready to be applied in practice.
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Holden, Daniel. "Modelling motivic processes in music : a mathematical approach." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/9115/.
Анотація:
This thesis proposes a new model for motivic analysis which, being based on the metaphor of a web or network and expanded using the mathematical field of graph theory, balances the polar concerns prevalent in analytical writing to date: those of static, out-of-time category membership and dynamic, in-time process. The concepts that constitute the model are presented in the third chapter, both as responses to a series of analytical observations (using the worked example of Beethoven’s Piano Sonata in F minor, Op. 2, No. 1), and as rigorously defined mathematical formalisms. The other chapters explore in further detail the disciplines and methodologies on which this model impinges, and serve both to motivate, and to reflect upon, its development. Chapter 1 asks what it means to make mathematical statements about music, and seeks to disentangle mathematics (as a tool or language) from science (as a method), arguing that music theory’s aims can be met by the former without presupposing its commonly assumed inextricability from the latter. Chapter 2 provides a thematic overview of the field of motivic theory and analysis, proposing four archetypal models that combine to underwrite much thought on the subject before outlining the problems inherent in a static account and the creative strategies that can be used to construct a dynamic account. Finally, Chapter 4 applies these strategies, together with Chapter 3’s model and the piece’s extensive existing scholarly literature, to the analysis of the first and last movements of Mahler’s Sixth Symphony. The central theme throughout – as it relates to mathematical modelling, music theory, and music analysis – is that of potential, invitation, openness, and dialogic engagement.
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Azevedo, Elizabeth Quirino de [UNESP]. "Ensino-aprendizagem das equações algébricas através da resolução de problemas." Universidade Estadual Paulista (UNESP), 2002. http://hdl.handle.net/11449/91015.
Анотація:
Made available in DSpace on 2014-06-11T19:24:51Z (GMT). No. of bitstreams: 0
Previous issue date: 2002-10-03Bitstream added on 2014-06-13T18:52:53Z : No. of bitstreams: 1
azevedo_eq_me_rcla.pdf: 5218368 bytes, checksum: 48d4b3729b2c248f6e63e4d7f72e828e (MD5)Este trabalho tem como tema central de investigação o ensino-aprendizagem das equações algébricas através da resolução de problemas. Nesta abordagem buscaram-se respostas para a questão de seu ensino no final do 3 ano do Ensino Médio. O estudo levou a um aprofundamento teórico de temas como: o ensino-aprendizagem da matemática, a matemática necessária para um trabalho com equações algébricas e uma metodologia de ensino-aprendizagem da matemática através de resolução de problemas. Na pesquisa de campo a coleta de dados utilizou-se de entrevistas, questionário, análise de documentos legais, análise de livros didáticos e não didáticos. Os tópicos de análise foram: a importância do ensino-aprendizagem das equações algébricas no final do terceiro ano do Ensino Médio, a utilização das equações algébricas em cursos universitários e como o ensino das equações algébricas no final do Ensino Médio é visto por alguns autores de livros didáticos e pesquisadores em Educação Matemática. Ainda, o tema equações algébricas assume o papel de enfeixar um programa de ensino de matemática ao longo de doze anos de estudo. A metodologia adotada neste trabalho foi a Metodologia de Romberg.
This research has as central theme of investigation the teaching and learning of algebraic equations through problem solving. In this approach we have looked for answers to some questions about its teaching at the end of the third year of High School. The study took us to a theoretical deepening of themes like: the teaching and learning of mathematics, the necessary mathematics for a study with algebraic equations and a methodology of mathematics teaching and learning through problem solving. In the field research, we used interviews, questionnaires and analysis of legal documents and books. The topics of analysis were: the importance of teaching and learning of algebraic equations at the end of third year of High School, the use of algebraic equations in undergraduate courses and how the teaching of this topic at the end of High School is seen by some writers in mathematics education. So, the theme algebraic equations assumes the role of tying together the teaching of mathematics through twelve years of studying. As research methodology we adopted the Romberg's Methodology.
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Herminio, Paulo Henrique [UNESP]. "Matemática financeira: um enfoque da resolução de problemas como metodologia de ensino e aprendizagem." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/91115.
Анотація:
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herminio_ph_me_rcla.pdf: 1068176 bytes, checksum: 92277eb2432043302c8bf9010f3ac311 (MD5)Esta pesquisa é fruto de algumas muitas indagações sobre a Matemática Financeira ensinada na escola e dentre as quais destacamos: (1) Será que os alunos gostariam de adquirir conhecimentos sobre Matemática Financeira? (2) Como os professores abordam esse tema de estudo? Qual é a relevância desse trabalho para os alunos de acordo com a visão docente? Na pesquisa que se apresenta, fizemos um estudo introdutório sobre o início das relações comerciais e financeiras em nossa humanidade e procuramos abordar alguns aspectos sobre a história dessas relações em nosso país. Analisamos a maneira como os livros didáticos de Matemática traziam e trazem o conteúdo de Matemática Financeira no contexto da Matemática escolar, assim como a opinião dos professores com relação a esse conteúdo. Criamos um Projeto de Ensino que foi trabalhado através da Metodologia de Ensino-Aprendizagem de Matemática através da Resolução de Problemas, voltado para o trabalho com alunos em uma sala de aula de Ensino Médio, de forma investigativa e construtiva, sobre os conceitos de Matemática Financeira. Buscamos, através da aplicação desse projeto em sala de aula, tratar das reflexões sociais que envolvem os conceitos de Matemática Financeira. A Metodologia de pesquisa adotada foi a Metodologia de Romberg.
This research is fruit of some inquiries on the Financial Mathematics taught at school and among which we highlighted: (1) Would the students like to acquire knowledge on Financial Mathematics? (2) How do the teachers approach that study theme? Which is the relevance of that work for the students in agreement with the educational vision? In the research that comes, we made an introductory study on the beginning of the commercial and financial relationships in our humanity and we tried to approach some aspects on the history of those relationships in our country. We analyzed the way as the text books of Mathematics brought and bring the content of Financial Mathematics in the context of the school Mathematics, as well as the teachers' opinion regarding that content. We created a Project of Teaching that was worked through the Methodology of Teaching-Learning Mathematics through the Problem Solving, returned for the work with students in a High School classroom, in a investigative and constructive form, on the concepts of Financial Mathematics. We looked for, through the application of that project in classroom, to treat of the social reflections that involve the concepts of Financial Mathematics. The Methodology of adopted research was the Methodology of Romberg.
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Silva, Cláudia da [UNESP]. "Eficácia de um Programa de remediação fonológica e leitura em escolares com distúrbio de aprendizagem." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91215.
Анотація:
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silva_c_me_mar.pdf: 672543 bytes, checksum: 7bb45e582442ec02c8aa08741f19e790 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A aprendizagem pode ser definida como um processo que ocorre no sistema nervoso central, em que são produzidas mudanças mais ou menos permanentes, que se traduzem em uma modificação funcional ou de comportamento, permitindo uma melhor adaptação do indivíduo ao meio como resposta a uma ação ambiental. O distúrbio de aprendizagem é uma expressão genérica que se refere a um grupo heterogêneo de alterações que manifestam dificuldades significativas na aquisição e no uso da audição, fala, leitura, escrita, raciocínio ou habilidades matemáticas. O objetivo deste estudo consiste em verificar a eficácia terapêutica de um programa de remediação fonológica e leitura em escolares com distúrbio de aprendizagem. Participaram deste estudo 40 crianças de 2ª a 4ª séries de ensino fundamental do município de Marília-SP, de ambos os gêneros, na faixa etária de 8 a 12 anos de idade, sendo distribuídos nos seguintes grupos: GI: composto de 20 escolares sem dificuldades de aprendizagem da rede municipal de ensino público, subdividido em GIE (10 escolares que foram submetidos ao programa de remediação fonológica e leitura) e GIC (10 escolares que não foram submetidos ao programa de remediação fonológica e leitura), e GII: composto de 20 escolares com diagnóstico interdisciplinar de distúrbio de aprendizagem, subdivididos em GIIE (10 escolares que foram submetidos ao programa de remediação fonológica e leitura) e GIIC (10 escolares que não foram submetidos ao programa de remediação fonológica e leitura). Em situação de pré e pós-testagem, todos os sujeitos deste estudo foram submetidos à aplicação do Teste de Desempenho Cognitivo-Lingüístico nas versões coletivo e individual, seguido de avaliação da leitura oral e da compreensão de textos. Os resultados foram analisados estatisticamente, utilizando o Teste de Mann- Whitney com o objetivo de verificar...
Learning is a process that occurs in the central nervous system in which permanent changes happen, provoking functional or behavioural change. It allows an individual to adapt in the environment he makes part. Learning difficulty is a generic expression regarding to heterogeneous groups of modification that manifest relevant difficulty in acquiring and using hearing, talking, reading, writing and mathematical aptitude. Thus, this research aims verifying therapeutic effectiveness of the phonological and reading program of remediation in students with learning difficulty 40 students of both gender and ranging 8 to 12 years old, of the elementary school of Marília, SP, Brazil, participated of this study. They were divided in groups: GI – 20 students without learning difficulty subdivided in GIE (10 students that have being submitted to the program of remediation) and GIC (10 students that have not being submitted to the program of remediation); and GII: 20 students with learning difficulty subdivided in GIIE (10 students that have being submitted to the program of remediation) and GIIC (10 students that have not being submitted to the program of remediation). In previous and post testing situation, all subjects of this study have being submitted to the Cognitive-Linguistic Performance Test in the collective and individual version and submitted to oral reading and text comprehension tasks. The results were statistically analyzed using the Mann- Whitney Test aiming at verifying differences of the groups of previous and post testing. They were also statistically analyzed using the Wilcoxon Test aiming at verifying differences of both moment, previous and post testing, considered in the assessment of each group. Data were analyzed using Friedman Test aiming at verifying differences of the variables of each group. The results highlighted that GI presented inferior development comparing... (Complete abstract click electronic access below)
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Santos, Laís da Conceição dos [UNESP]. "Bioecologia e capacidade predatória de Coccinellidae (Insecta: Coleoptera) alimentado com Schizaphis graminum (Rondani) (Hemiptera: Aphididae)." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/91315.
Анотація:
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santos_lc_me_jabo.pdf: 472882 bytes, checksum: 925de04697f816564416eec71082d5d8 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho foi avaliar os aspectos biológicos, o potencial de predação e obter tabelas de vida de fertilidade do coccinelídeo Harmonia axyridis (Pallas) em comparação à Cycloneda sanguinea (Linnaeus) e Hippodamia convergens (Guérin-Meneville) tendo como presa Schizaphis graminum (Rondani). Larvas recém-eclodidas de cada uma das espécies de joaninhas foram individualizadas e alimentadas diariamente com ninfas e adultos de S. graminum à vontade. Na fase adulta foram separados dez casais, mantidos em copos de plástico transparentes de 350 mL e alimentados diariamente com o pulgão S. graminum, sendo os tratamentos representados pelas espécies de joaninhas. Comparando-se os três coccinelídeos, o período larval e ovo-adulto de H. axyridis foram os mais longos, 10,2 dias e 16,5 dias, respectivamente, enquanto o de C. sanguinea foi o menor. Adultos de H. axyridis apresentaram peso médio significativamente maior, 29,9 mg . Essa espécie apresentou a maior capacidade de predação, 1.493,7 pulgões na fase larval e 2.159,8 pulgões durante 10 dias da fase adulta. A capacidade total de oviposição e longevidade de H. axyridis, foi de 716,1 ovos e 135,0 dias, respectivamente, foram semelhantes àquelas apresentadas por C. sanguinea e H. convergens. A viabilidade dos estágios imaturos foi igual ou superior a 70%, indicando que a temperatura e a presa oferecida foram favoráveis ao desenvolvimento dessas três espécies. Harmonia axyridis se destacou pela maior capacidade de predação de pulgões S. graminum tanto na fase larval como na fase adulta. O valor de T (intervalo de tempo entre cada geração) para H. axyridis foi de 18,24 dias, o de C. sanguinea e H. convergens, foi, respectivamente, de 20,35 e 9,80 dias. Os resultados obtidos evidenciam o potencial de C. sanguinea, H. axyridis e H. convergens como agentes de controle biológico
The objective of this study was to evaluate the biological aspects and predatory potential of the coccinellid Harmonia axyridis (Pallas) in comparison to Cycloneda sanguinea (Linnaeus) and Hippodamia convergens (Guérin-Meneville) fed Schizaphis graminum (Rondani). Newly hatched larvae of each species of ladybugs were individualized and fed daily with nymphs and adults of S. graminum. In the adult stage were separed ten couples , kept in 350 mL clear plastic cups and fed daily with the aphid S. graminum, being the treatments represented by the species of ladybugs. Comparing the three coccinellids, the larval and egg-adult period of H. axyridis were the longest, 10.2 days and 16.5 days, respectively, while C. sanguinea had the shortest. Adults of H. axyridis showed significantly greater weight, on average 29.9 mg. This species showed the highest capacity of predation, consuming 1493.7 larval stage aphids and 2159.8 adult aphids during 10 days of adult stage. The total capacity of oviposition and longevity presented by H. axyridis, average of 716.1 eggs and 135.0 days, respectively, were similar to those presented by C. sanguinea and H. convergens. The viability of the evaluated stages was equal or higher than 70%, indicating that the temperature and prey offered were favorable to the development of these three species. H. axyridis showed the highest predation capacity of S. graminum aphids in both larvae and adult stages. The value of T (time interval between each generation) to H. axyridis was 18.24 days, of C. sanguinea and H. convergens was, respectively 20.35 and 9.80 days. The results showed the potential of C. sanguinea, H. axyridis and H. convergens as biological control agents
Книги з теми "91A15":
1
Wei, Yanjie, Min Li, Pavel Skums, and Zhipeng Cai, eds. Bioinformatics Research and Applications. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91415-8.
2
Kyosev, Yordan, and Francois Boussu, eds. Advanced Weaving Technology. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91515-5.
3
Dawood, Gamal. Color Atlas of Human Gross Pathology. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91315-1.
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Portmann, Susanne Weinert. Familie – ein Symbol der Kultur. Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91515-9.
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Maćków, Jerzy, ed. Autoritarismus in Mittelund Osteuropa. Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91615-6.
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Biethahn, Jörg, Wilhelm Hummeltenberg, Bernd Schmidt, and Thomas Witte, eds. Simulation als betriebliche Entscheidungshilfe. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5.
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Oswald, Peter. Multilevel Finite Element Approximation. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91215-2.
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Bittner, Andreas, and Bernhard Reisch. Interkulturelles Personalmanagement. Wiesbaden: Gabler Verlag, 1995. http://dx.doi.org/10.1007/978-3-322-91315-9.
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Qabaha, Ahmad Rasmi. Exile and Expatriation in Modern American and Palestinian Writing. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91415-2.
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Kanai, Akane. Gender and Relatability in Digital Culture. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91515-9.
Частини книг з теми "91A15":
1
Gangl, Peter. "Simulation — eine Schlüsseltechnologie der 90er Jahre: Hoher Nutzen aber geringer Kenntnisstand in der Industrie." In Simulation als betriebliche Entscheidungshilfe, 1–10. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_1.
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Nissen, Volker, and Jörg Biethahn. "Simulation und Evolutionäre Algorithmen — Kombinationsmöglichkeiten und ihre Relevanz für betriebswirtschaftliche Fragestellungen." In Simulation als betriebliche Entscheidungshilfe, 119–39. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_10.
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Claus, Thorsten. "Genetische Simulation." In Simulation als betriebliche Entscheidungshilfe, 140–52. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_11.
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Schmidt, Christian. "Betriebswirtschaftliche Organisationsplanung mit Petri-Netzen." In Simulation als betriebliche Entscheidungshilfe, 153–75. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_12.
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Lyhs, Wilfried. "Simulation von COREX-Anlagen mit Hilfe von MetaMod." In Simulation als betriebliche Entscheidungshilfe, 176–95. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_13.
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Kirchner, H. "Ein Simulationstool für kranbediente Logistiksysteme." In Simulation als betriebliche Entscheidungshilfe, 196–204. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_14.
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Kühn, Wolfgang. "Vergleich verschiedener Simulationstools an einem flexiblen Montagesystem." In Simulation als betriebliche Entscheidungshilfe, 205–32. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_15.
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Fender, Holger, Albrecht Hönerloh, Jochen Kuhl, and Stephan Preuß. "Anwendung von PACE auf ein Problem der Verkehrsplanung." In Simulation als betriebliche Entscheidungshilfe, 233–47. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_16.
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Noche, Bernd. "Anwendungen der Simulation auf strategischen Unternehmensebenen." In Simulation als betriebliche Entscheidungshilfe, 248–62. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_17.
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Kuhn, Norbert, Jörg P. Müller, and Jürgen Müller. "Simulating Cooperative Transportation Companies." In Simulation als betriebliche Entscheidungshilfe, 263–74. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-91115-5_18.
Тези доповідей конференцій з теми "91A15":
1
"Front Matter: Volume 9115." In SPIE Sensing Technology + Applications. SPIE, 2014. http://dx.doi.org/10.1117/12.2074006.
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Challa, Pradyumna R., and A. Bazylak. "Pore Space Characterization of Compressed PEMFC GDLs Using 3D Micro-Computed Tomography." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91415.
Анотація:
In this work, micro-computed tomography was employed to characterize the effect of rib and channel compression on the through-plane porosity distributions of polymer electrolyte membrane fuel cell (PEMFC) gas diffusion layers (GDLs). Two GDLs with micro-porous layers (MPLs): a paper based GDL (GDL A), and a felt GDL (GDL B) were compressed at 1.2 MPa in an ex situ flow field apparatus with 1mm × 1mm channels. Porosity distributions of compressed GDLs were compared with those of uncompressed GDLs, and the microstructural differences caused during the manufacturing of paper, felt, and cloth GDLs are discussed. The results of this study will aid modellers in generating realistic stochastic GDL pore structures for multiphase flow simulations.
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Pavlov, Aleksandr Vyacheslavovich. "Bank liquidity estimation by an international rating agency." In X International students' applied research conference. TSNS Interaktiv Plus, 2016. http://dx.doi.org/10.21661/r-91315.
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Martin, Benjamin, Martin Thomas, Jérôme Dombard, Florent Duchaine, and Laurent Gicquel. "Analysis of Solid Particle Ingestion and Dynamics in a Turbomachine Using Large-Eddy Simulation." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91215.
Анотація:
Abstract Erosion of compressor and turbine blades operating in extreme environment fouled with sand particles, ash or soot is a serious problem for gas turbine manufacturers and users. Indeed, operation of a gas turbine engine in such hostile conditions leads to drastic degradation of the aerodynamic performance of the components, mostly through surface roughness modification, tip clearance height increase or blunting of blade leading edges. To evaluate associated risks, the computation of particle trajectories and impacts through multiple turbomachinery stages by Computational Fluid Dynamics (CFD) seems a decent path but remains a challenge. The numerical prediction of complex turbulent flows in compressors and turbines is however necessary in such a context and validations are still required. Recently, Large-Eddy Simulation (LES) has shown promising results for compressor and turbine configurations for a wide range of operating conditions at an acceptable cost. With this in mind, this article presents the assessment of a LES solver able to treat turbomachine configurations to predict solid particle motion. To do so, the governing equations of particle dynamics are introduced using the Lagrangian formalism and are solved to compute locations and conditions of impact, namely particle velocity, angle and radius. The fully unsteady and coupled strategy is applied to blade geometries for studying the main areas and conditions of impacts obtained with LES. For comparison, a one-way coupling computation based on a mean steady flow field where only the Lagrangian particles are advanced in time is performed to evaluate the gain and drawbacks of both methods.
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Muñoz, Alejandro, David Sánchez, Mark Savill, Timoleon Kipouros, and Carlos Tello-Castillo. "Impact of Fluid Substitution on the Performance of an Axial Compressor Blade Cascade Working With Supercritical Carbon Dioxide." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91615.
Анотація:
Abstract Recent research on turbomachinery design and analysis for supercritical Carbon Dioxide (sCO2) power cycles has relied on Computational Fluid Dynamics. This has produced a large number of works whose approach is mostly case-specific, rather than of general application to sCO2 turbomachinery design. As opposed to such approach, this work explores the aerodynamic performance of compressor blade cascades operating on air and supercritical CO2 with the main objective to evaluate the usual aerodynamic parameters of the cascade for variable boundary conditions and geometries, enabling ‘full’ or ‘partial’ similarity. The results present both the global performance of the cascades and certain features of the local flow (trailing edge and wake). The discussion also highlights the mechanical limitations of the analysis (forces exerted on the blades), which is the main restriction to applying similarity laws to extrapolate the experience gained through decades of work on air turbomachinery to the new working fluid. This approach is a step towards the understanding and appropriate formulation of a multi-objective optimisation problem for the design of such turbomachinery components where sCO2 is used as the operating fluid. With this objective, the paper aims to identify and analyse what would be expected if a common description of such computational design problems similar to those where air is the working fluid were used.
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Brüggemann, C., M. Schatz, D. M. Vogt, and F. Popig. "Experimental and Numerical Assessment of the Impact of Part-Span Connectors on Turbine Efficiency and Flow Field." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91815.
Анотація:
Abstract This study presents the results of measurements in an industrial steam turbine test rig operated at the Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM) in Stuttgart, Germany. In order to ensure safe operation over a wide range of operating conditions the last and penultimate rotor blade rows of this turbine feature Part-Span Connectors (PSC). The PSC provide additional coupling and mechanical damping during operation, however, they present a major obstacle to the flow, thus causing additional aerodynamic loss. The focus of the present work is on the aerodynamic impact of the PSC on the flow field of the last stage. To capture this impact, an extensive measurement campaign over a wide range of operating points was performed using two last blade row configurations that are identical with regard to the blade design, except for the fact that one features free-standing blades while the second is equipped with PSC. A performance assessment of these two configurations based on detailed probe measurements and overall turbine efficiency is presented. Additionally, a detailed comparison of 3D CFD-results employing an equilibrium steam (EQS) model and a non-equilibrium steam (NES) model for both configurations is shown with good agreement to the test data. However, comparing the two models reveals major differences whenever there is condensation occurring close to the evaluation plane, thus the advantage of applying the NES model is presented.
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Williams, Aimee, Nishant Jain, Jerry Seitzman, and Ben T. Zinn. "Behavior of Autoignition in Polydisperse Jet-A Fuel Spray With High Temperature Co-Flow." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91915.
Анотація:
Abstract Liquid fueled combustors are commonly used in the gas turbine industry in situations such as high temperature fuel mixing ducts, liquid fueled reheat combustors, and other high temperature liquid fueled combustors. Modern combustors operate at high inlet temperatures, increasing the likelihood of autoignition events. Autoignition is primarily characterized using a single-step Arrhenius rate equation. Generally, this method is ideal for modeling the chemical processes involved in simplistic settings such as for analyzing ignition delays with premixed reactive mixtures in shocktubes, however it may not fully encapsulate the underlying physio-chemical processes involved in the presence of a multi-phase flow which can significantly affect the chemical processes such as autoignition. These conditions are often encountered in reality, for example, in a gas turbine combustor using fuel sprays where interactive phenomena such as fuel droplet evaporation, mixing, and chemical reactions may occur simultaneously and non-homogeneously. The results presented in this report begin to elucidate the role of droplets in determining the behavior of autoignition kernels with an attempt to improve our capability to predict autoignition phenomena in liquid fuel injector application in gas turbine industry. To investigate the autoignition phenomena in a multi-phase flow inside a gas turbine combustor, a simplified co-flow type geometry is considered at atmospheric pressure where a single Jet-A fuel spray enters the co-flowing high temperature vitiated products of a pilot burner. Fuel is injected using an aerodynamically shaped pressure-swirl atomizing injector installed co-axially with the flow inside an optically accessible quartz test section. The air temperatures and oxygen content of the flow can range from 950–1300K and 9–11%, respectively. It has previously been found that while average ignition delay times agree or nearly agree with prior theoretical and experimental studies (eg. for prevaporized fuel, electrically heated), high speed imaging experiments illustrate that the spatial location of the formed kernels can be broadly scattered. Also, this variation in autoignition kernel location is higher at lower temperatures. Simultaneous high speed CH and OH chemiluminescence also suggest that the kernels are formed at lower equivalence ratios at lower preheat temperatures and then proceed to increase in equivalence ratio. While at higher preheat temperatures, kernels form at a higher equivalence ratio and stay at the ratio as they propagate downstream. In the current study, a 5000fps, 283nm laser sheet is introduced along the center axis of the test section. Two synchronized, intensified, high-speed cameras simultaneously captured the fluorescence of Jet-A and OH chemical reaction at 308nm and the Mie scattering of droplets at 283nm. Autoignition kernels and that droplets are visualized at flow velocities ranging from 40–50 m/s and temperatures ranging from 1100–1300K. This technique allows the fuel and reaction fluorescence to be differentiated and from this image, information is obtained on the proximity of fuel droplets and autoignition kernels during their formation and subsequent propagation.
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Quinnell, Josh A., and Jane H. Davidson. "Buoyancy Driven Mass Transfer in a Liquid Desiccant Storage Tank." 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/es2012-91315.
Анотація:
A new concept for long-term solar storage is based on the absorption properties of aqueous calcium chloride. Water, diluted and concentrated calcium chloride solutions are stored in a single tank. An immersed heat exchanger and stratification manifold are used to preserve long-term sorption storage, and to achieve thermal stratification. The feasibility of the concept is demonstrated via measurements of velocity, CaCl2 mass fraction, and temperature in a 1500 liter prototype tank during sensible charging. Experiments are conducted over a practical range of the relevant dimensionless parameters. For Rayleigh numbers from 3.4 × 108 to 5.6 × 1010 and buoyancy ratios from 0.8 to 46.2, measured Sherwood numbers are 11±2 to 62±9 and the tank is thermally stratified. Convective mixing is inhibited by the presence of a steep density gradient at the interface between regions of differing mass fraction. The predicted storage time scales for the reported Sherwood numbers are 160 to 902 days.
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Lu, Yuanwei, Yuting Wu, Chongfang Ma, and Xiaoying Mu. "The Manufacture and Performance Test of a Mini-Type Single Screw Compressor." 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/es2012-91515.
Анотація:
With the development of very large scale integration, the chip heat dissipation is a problem that needs to be solved urgently. Vapor compression refrigeration system is a valid method to cool the electric chip. However, a particular challenge is to make a small and efficient gas compressor. In this paper, a mini-type single screw compressor was manufactured in Beijing University of Technology and a corresponding performance test system was set up. Experimental results show that the heat created by the single screw compressor is higher, which led to an extreme high exhaust temperature. An effective solution is to introduce the low temperature refrigerant from the condenser to the compressor directly to cool down the compressor. Based on this procedure, the compressor performance was measured experimentally. It was found that the condensing temperature, compressor rotation speed and refrigerant charge can affect the compressor performance noticeably and every affective factor has an optimal value. According to the optimal results, the compressor refrigerating capacity of 2.03 kW and system coefficient of performance (COP) of 2.24 was achieved at the evaporating temperature of 5 °C and condensing temperature of 32 °C. Those results can be a baseline for the further performance enhancement of the single screw compressor and can be a valid method for the cooling of large scale integration.
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Zhao, Changxuan, and Shreyes N. Melkote. "Learning the Part Shape and Part Quality Generation Capabilities of Machining and Finishing Processes Using a Neural Network Model." 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/detc2022-91115.
Анотація:
Abstract Automatically acquiring knowledge of manufacturing process capabilities from existing data is essential for automated process selection in digital and cyber manufacturing. In this work, we present a neural network model to automatically learn the capabilities of discrete manufacturing processes such as machining and finishing from design and manufacturing data. Concatenating a 3D Convolutional Neural Network (3D CNN) with an artificial neural network, the combined model can learn the part shape and part quality generation capabilities of the manufacturing processes. Specifically, the proposed method takes the voxelized part geometry and part quality information as inputs and utilizes a mixed neural network model (3D CNN + artificial neural network) to predict the manufacturing process label as output. The manufacturing process capability knowledge embedded in the neural network model is scalable and updatable as new manufacturing data becomes available. We present an example implementation of the proposed method with a synthesized manufacturing dataset to illustrate how the method enables automatic manufacturing process selection. The high prediction accuracy shows its predictive strength for use in Computer Aided Process Planning (CAPP).
Звіти організацій з теми "91A15":
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Bhakta, Satish D., Stuart I. Smedley, Sam Hefliarachchi, and Her-King Song. PR-215-9115-R01 Internal Corrosion Control and Monitoring. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 1992. http://dx.doi.org/10.55274/r0011695.