Relevant bibliographies by topics / 91B32

Academic literature on the topic '91B32'

Author: Grafiati
Published: 1 June 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic '91B32.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "91B32":

1

Lord, Nick. "91.32 Some more irrational thoughts." Mathematical Gazette 91, no. 521 (July 2007): 256–60. http://dx.doi.org/10.1017/s0025557200181628.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kwon, Lee Ha, Yong Wun Cho, Seong-Jae Kim, Inyoung Chung, and Woong Sun Yoo. "Changes in Macular Thickness and Microvasculature in Koreans with Early Parkinson’s Disease." Journal of the Korean Ophthalmological Society 64, no. 11 (November 15, 2023): 1055–62. http://dx.doi.org/10.3341/jkos.2023.64.11.1055.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Purpose: To investigate the thickness of the nerve fiber layer-ganglion cell inner plexiform layer (NFL-GCIPL) complex and microvascular macular changes in Korean patients with early Parkinson’s disease using optical coherence tomography (OCT) and OCT angiography (OCTA).Methods: Forty-three eyes of 22 patients with early Parkinson’s disease were included. A control group of 20 patients (40 eyes) was also recruited. The thickness of the NFL-GCIPL macular complex was measured using OCT, and the densities of the superficial and deep macular retinal vessels were evaluated via OCTA in all subjects.Results: The NFL-GCIPL thicknesses of the superior, inferior, temporal, and nasal sectors were 94.70 ± 9.35, 93.32 ± 9.16, 90.18 ± 6.32, and 93.11 ± 8.75 μm in the control group and 92.05 ± 4.96, 91.32 ± 7.48, 84.74 ± 6.82, and 91.32 ± 7.47 μm in the Parkinson’s disease group, respectively; all thicknesses were significantly greater in the control group. The superficial and deep retinal vessel densities did not differ between the two groups.Conclusions: Neurodegenerative macular changes are more obvious than microvascular changes in patients with early Parkinson’s disease. Such neurodegenerative changes should be further evaluated in future cohort studies.
3

van der Schoot, Paul. "Erratum: “Depletion interactions in lyotropic nematics” [J. Chem. Phys. 112, 9132 (2000)]." Journal of Chemical Physics 113, no. 9 (September 2000): 3931. http://dx.doi.org/10.1063/1.1287614.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Putri, Raddina Aprilia, Yunin Hidayati, and Irsad Rosidi. "VALIDITAS TEORITIS LEMBAR KERJA SISWABERBASIS CONCEPT ATTAINMENT MODEL PADA MATERI INTERKASI MAKHLUK HIDUP DENGAN LINGKUNGAN." Natural Science Education Research 1, no. 2 (December 1, 2018): 179–91. http://dx.doi.org/10.21107/nser.v1i2.4809.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Penelitian ini bertujuan untuk mendeskripsikan validitas teoritis Lembar Kerja Siswa Berbasis Concept Attainment Model pada materi interaksi makhluk hidup dengan lingkungan untuk kelas VII SMP. Jenis penelitian ini adalah penelitian deskriptif. Teknik pengumpulan data menggunakan lembar validasi. Penelitian ini mengacu pada model pengembangan Dick and Carey. Validasi dilakukan berdasarkan syarat LKS yang baik serta sesuai dengan karakterisik concept attainment model. Berdasarkan hasil validasi pakar yang telah dilakukan diperoleh skor validitas sebesar 91,32%.
5

Núñez-Luna, Virginia, and José Luis Pérez-Ávalos. "Utilidad clínica de la zetaplastia de cuatro colgajos en secuelas de quemadura." Cirugía Plástica 29, no. 3 (2019): 267–72. http://dx.doi.org/10.35366/91732.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bula, I. "DISCONTINUOUS FUNCTIONS IN GALE ECONOMIC MODEL." Mathematical Modelling and Analysis 8, no. 2 (June 30, 2003): 93–102. http://dx.doi.org/10.3846/13926292.2003.9637214.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The concept of a general economic equilibrium based on balance of supply and demand has played a central role in theoretical economics since very beginning. One of the basic assumptions in mathematical modelling of the equilibrium economic model is the continuity of functions describing the model. This article analyses simplified version of Gale model from year 1955 by weakening the condition of strict convexity and continuity of utilities functions and proving existence of quasi‐equilibrium in generalized Gale model. MSC 2000: 91B24, 91B42, 91B50, 26A15.
7

CHARLTON, JA, PA DAVIES, GHM BETHUNE, JH ALLEN, JJ SHARP, and G. THOMPSON. "SEA WATER INTRUSION AND PURGING IN MULTI-PORT SEA OUTFALLS. DISCUSSION ON PAPER 9132." Proceedings of the Institution of Civil Engineers 85, no. 1 (March 1988): 197–99. http://dx.doi.org/10.1680/iicep.1988.119.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Araújo, A., E. Pousa, M. Soares, I. Azevedo, and R. Velosa. "9132 The importance of haematological toxicity on outcomes of small-cell lung cancer patients." European Journal of Cancer Supplements 7, no. 2 (September 2009): 544. http://dx.doi.org/10.1016/s1359-6349(09)71845-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Gallego Blasco, Vicente Salvador, SEBASTIAN MARTORELL ALSINA, and ANA ISABEL SANCHEZ GALDON. "ANÁLISIS DE CAMBIOS DE TENDENCIAS DE INDICADORES DE SALUD OCUPACIONAL EN ESPAÑA, EN EL PERIODO 1995 A 2017." DYNA INGENIERIA E INDUSTRIA 95, no. 1 (2020): 39–42. http://dx.doi.org/10.6036/9132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Spitzer, Nicholas C. "New dimensions of neuronal plasticity." Nature Neuroscience 2, no. 6 (June 1999): 489–91. http://dx.doi.org/10.1038/9132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources
You might also be interested in the extended bibliographies on the topic '91B32' for particular source types:
Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "91B32":

1

Scetbon, Meyer. "Advances in Optimal Transport : Low-Rank Structures and Applications in Machine Learning." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAG002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Les progrès récents en matière de matériel informatique, tels que le développement d'accélérateurs hautement parallèles, et la perméabilité croissante entre l'informatique, les statistiques, l'optimisation et les mathématiques appliquées ont donné naissance à une nouvelle génération d'outils capables de résoudre des problèmes d'apprentissage automatique (AA) de plus en plus complexes. Parmi ces nouveaux défis, certains nécessitent la comparaison de nuages de points ou de mesures de probabilité. Le transport optimal (TO) est devenu un outil largement utilisé dans ce contexte en raison de sa capacité à fournir une géométrie naturelle dans l'espace des distributions et à offrir une nouvelle perspective pour traiter les problèmes d'AA lorsqu'ils sont levés dans cet espace. À partir d'une fonction de coût (par exemple, une distance) défini entre les points où sont supportées les mesures, le TO consiste à trouver un couplage entre les deux mesures qui soit optimal par rapport à ce coût. En d'autres termes, le TO étend naturellement le coût entre deux points à coût entre des histogrammes de points, ou des mesures de probabilité, sous la forme d'un problème d'optimisation. De plus, en raison de sa forte composante géométrique, le TO fait l'objet d'une riche théorie mathématique sur laquelle les praticiens peuvent s'appuyer pour construire et étudier leurs modèles.Pourtant, dans leur forme originale, telle qu'elle a été proposée par Kantorovich, les distances de TO ne sont pas bien adaptées aux problèmes appliqués : (i) le calcul du TO entre des mesures discrètes revient à résoudre un programme linéaire coûteux qui requiert une complexité supercubique en le nombre de points; (ii) l'estimation du TO à l'aide de mesures échantillonnées est condamnée par la malédiction de la dimensionnalité, le TO est donc susceptible d'être dépourvue de sens lorsqu'elle est utilisée sur des échantillons provenant de densités en haute dimension. En dépit de ces difficultés, le TO s'est révélée très prometteur dans diverses applications d'AA, et les recherches en cours visent à relever ces défis et à rendre le TO plus accessible et utilisable dans la pratique.La principale approche pour pallier ces problèmes consiste à régulariser le problème d'optimisation en ajoutant un terme d'entropie a l'objectif. En ajoutant de l'entropie, on peut alors résoudre une version régularisée du problème de TO en temps et en mémoire quadratiques à l'aide de l'algorithme de Sinkhorn. De plus, cette régularisation permet d'éviter la malédiction de la dimensionnalité à condition d'avoir ajouté suffisamment d'entropie. Même si la régularisation entropique a amélioré à la fois le coût de calcul et les propriétés statistiques du transport optimal, elle souffre toujours d'une complexité quadratique qui empêche son utilisation pour des applications à grande échelle. Un des principes directeurs de cette thèse est qu'il existe encore de nombreuses opportunités de recherche pour développer de nouveaux outils algorithmiques qui peuvent exploiter ou étendre ce mode de pensée afin de rendre le TO applicable à des problèmes à grande échelle.Cette thèse se compose de deux parties principales. Dans la première partie, nous proposons de nouveaux schémas de régularisation du problème de TO et de sa variante quadratique, à savoir le problème de Gromov-Wasserstein (GW), en considérant des factorisations de bas rang à la fois du coût sous-jacent et du couplage résolvant le problème de TO. Ces nouveaux schémas de calcul ouvrent la voie à l'utilisation du problème TO dans un cadre à grande échelle. Dans la deuxième partie, nous montrons que le TO peut également offrir une nouvelle perspective sur des problèmes d'AA de longue date dès lors qu'ils sont formalisés dans l'espace des distributions. Nous adoptons ce point de vue sur deux problèmes appliqués, à savoir en équité et en robustesse, et proposons de nouvelles approches pour les aborder à l'aide du TO
Recent advances in hardware, such as the development of highly-parallel accelerators, and the growing permeabilitybetween computer science, statistics, optimization and applied mathematics have brought forward a new generation of tools,capable of addressing increasingly complex machine learning (ML) problems. Among these new challenges, some require the comparison of point clouds or probability measures. Optimal transport (OT) has become a widely used tool in this context due to its ability to provide a natural geometry in the space of distributions and offer a new perspective for dealing with ML problems when lifted into this space. Starting from a cost function (e.g. a distance) on the space on which measures are supported, OT consists in finding a mapping or coupling between both measures that is optimal with respect to that cost. In other words, OT naturally extends the ground cost between two points to a discrepancy function between histograms of points, or probability measures, in the form of an optimization problem. Further, as a consequence of its strong geometric component, OT is the object of a rich mathematical theory regarding its metric and topological properties, on which ML practitioners can rely to build and study their models.Yet, in their original form, as proposed by Kantorovich, OT distances are not well suited for applied problems: (i) computing OT between discrete distributions amounts to solving a large and expensive network flow problem which requires a supercubic complexity; (ii) estimating OT using sampled measures is doomed by the curse of dimensionality: the sample convergence rate of OT is exponentially slow w.r.t. the dimension of the ambient space, therefore OT is likely to be meaningless when used on samples from high-dimensional densities. Despite these challenges, OT has shown great promise in various machine learning applications, and ongoing research is aimed at addressing these challenges and making OT more accessible and usable in practice.The main approach to alleviate these issues consists in regularizing the optimization problem using an entropic regularization. By adding entropy to the objective function, one can now solves a regularized version of the OT problem in quadratic time and memory using the Sinkhorn algorithm. In addition, this regularization allows to avoid the curse of dimensionality as long as enough entropy has been added.Even though entropic regularization has improved both the computational cost and the statistical properties of optimal transport, it still suffers from a quadratic complexity that prevents its use for large-scale applications. One guiding principle of this thesis is that there are still many research opportunities to develop new algorithmic tools that can exploit or extend this way of thinking in order to make OT applicable to large-scale problems.This thesis consists of two main parts. In the first part, we propose new regularization schemes of the OT problem and its quadratic variant, namely the Gromov-Wasserstein (GW) problem, by considering low-rank factorization of both the underlying cost and the coupling solving the OT problem itself. These new computational schemes pave the way for the use of OT in the large-scale setting. In the second part, we show that OT can also offer new perspective on longstanding ML problems once lifted into the set of distributions. We adopt this point of view on two applied problems in fairness and robustness respectively and propose new approaches to tackle them using OT
2

Eschenfeldt, Patrick. "Approval Voting in Box Societies." Scholarship @ Claremont, 2012. https://scholarship.claremont.edu/hmc_theses/36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Under approval voting, every voter may vote for any number of canditates. To model approval voting, we let a political spectrum be the set of all possible political positions, and let each voter have a subset of the spectrum that they approve, called an approval region. The fraction of all voters who approve the most popular position is the agreement proportion for the society. We consider voting in societies whose political spectrum is modeled by $d$-dimensional space ($\mathbb{R}^d$) with approval regions defined by axis-parallel boxes. For such societies, we first consider a Tur&#aacute;n-type problem, attempting to find the maximum agreement between pairs of voters for a society with a given level of overall agreement. We prove a lower bound on this maximum agreement and find in the literature a proof that the lower bound is optimal. By this result we find that for sufficiently large $n$, any $n$-voter box society in $\mathbb{R}^d$ where at least $\alpha\binom{n}{2}$ pairs of voters agree on some position must have a position contained in $\beta n$ approval regions, where $\alpha = 1-(1-\beta)^2/d$. We also consider an extension of this problem involving projections of approval regions to axes. Finally we consider the question of $(k,m)$-agreeable box societies, where a society is said to be $(k, m)$-agreeable if among every $m$ voters, some $k$ approve a common position. In the $m = 2k - 1$ case, we use methods from graph theory to prove that the agreement proportion is at least $(2d)^{-1}$ for any integer $k \ge 2.$
3

Pearson, Caitlin E. "Effects of agricultural intensification on the ecology of upland stream invertebrate communities." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/91332/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Agricultural land use is a leading cause of habitat degradation and biodiversity loss in streams. Understanding the mechanisms by which land use change affects stream ecosystems is essential for their effective management. Despite this, the consequences of agricultural intensification for community composition and ecosystem functioning in streams remain poorly resolved. Using national-scale monitoring data and new field data from upland streams in South Wales, this study investigated the effects of pastoral intensification on the community composition, functional diversity and feeding interactions of stream macroinvertebrates. A combination of analytical tools were used, including propensity modelling, ecological traits, stable isotopes and Next Generation DNA sequencing to quantify diet. Taxonomic and functional diversity had non-linear relationships with pastoral intensity, declining beyond a threshold of 4 mg L-1 nitrate and 8% fine sediment cover. This decline occurred as a non-random loss of species possessing specific traits, including large body size and lack of resistance forms. Although monitoring data showed that at a UK-wide scale pastoral agriculture (cf. other land uses) had a positive effect on richness and sensitive species representation, the threshold intensity at which effects become negative is exceeded in many locations within the U.K. and globally. Invertebrates that feed by grazing algae were particularly vulnerable to agricultural stressors. Combined with changes in the availability and quality of basal resources with pastoral intensification, this decline in grazer representation resulted in invertebrate communities becoming increasingly reliant on detrital resources. Further, there was indication that methane-derived carbon contributed to the food web in high intensity sites, which has not previously been observed in upland streams. Although only relatively minor changes were observed in predator-prey interactions across the intensity gradient, there was a suggestion of simplification of the food web in high intensity sites. Together these changes could radically alter ecosystem properties such as secondary production, nutrient processing and resilience. Overall, the results highlight the management priorities of reducing fine sediment and nutrient inputs to agricultural streams. The identification of a threshold at which agricultural effects become deleterious will assist in guiding mitigation efforts. Further work is required to determine the generality of this threshold across stream ecosystems.
4

Chappell, Lauren. "Characterisation of parsnip canker pathogens and identification of plant resistance." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/91132/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Parsnips (Pastinaca sativa) are a speciality crop, covering 3000 hectares across the UK, with a 93,000-tonne production and economic value of greater than £31M annually. Currently, the major constraints to production are losses associated with root canker disease, caused by a range of fungal pathogens. With no specific fungicides, development of long-term, sustainable resistance to parsnip canker is highly desirable. This work characterises the pathogens responsible, and develops tools to facilitate breeding for quantitative resistance to root canker diseases. Isolations and molecular characterisation of pathogens responsible for parsnip canker highlighted a range of fungal species, whilst canker symptoms were found to be clearly associated with certain pathogens. Cylindrocarpon destructans, Mycocentrospora acerina and to a lesser extent Itersonilia pastinacae were identified as the primary pathogens responsible for causing parsnip canker in the UK. Itersonilia spp. isolates from a range of hosts were found to infect parsnip roots and leaves, and produce both chlamydospores and ballistospores at a range of temperatures; furthermore, molecular characterisation failed to differentiate between species. For these reasons, Itersonilia should be described as a single species. For both C. destructans and M. acerina, isolates showed minimal variation in pathogenicity on parsnip roots and seedlings, and exhibited mycelial growth even at low temperatures. Phylogenetic analysis identified a species complex for both pathogens that could not be resolved by the ITS (Internal transcribed spacer) alone. Finally, parsnip root and seedling assays were developed to determine resistance to I. pastinacae, M. acerina and C. destructans within parsnip populations. QTL analysis of a parsnip genotyping population identified a significant QTL conferring resistance to M. acerina for use in a marker assisted breeding programme. The understanding of the pathology gained in this project will facilitate selection of resistant varieties, benefitting breeders, growers and through reduction in control mechanisms, society in general.
5

Rossi, Eleonora. "Possibili fluttuazioni nel valore della costante di decadimento dei radionuclidi: studio per lo sviluppo di un esperimento di misura a lungo termine." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9132/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Esperimenti condotti negli anni Ottanta per la determinazione della vita media di alcuni radioisotopi sembrano mostrare fluttuazioni anomale del valore delle costanti di decadimento. Negli anni a seguire, altri studi hanno tentato di spiegare l'origine delle fluttuazioni osservate in questi primi lavori. Insieme agli esperimenti che hanno mostrato anomalie, però, ve ne sono altri che non hanno registrato alcuna deviazione. Con il seguente elaborato si ha l'intento di ordinare e organizzare schematicamente gli articoli pubblicati finora e realizzare così un quadro della situazione attuale. Questo può essere utile per predisporre un esperimento, da svolgersi presso il Laboratorio di Fisica delle Radiazioni del Dipartimento di Fisica e Astronomia dell'Università di Bologna, che possa arricchire la casistica del fenomeno. Si affronta in conclusione la progettazione dell'esperimento a lungo termine, per il quale si prevede inizialmente una durata triennale delle osservazioni.
6

Dufferwiel, Scott. "Strongly confined exciton-polaritons in a tunable microcavity." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/9132/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Perfetti, Guglielmo. "Absolute beginners of the 'Belpaese' : Italian youth culture and the Communist Party in the years of the economic boom." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/9132/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
This study has the aim of exploring aspects of youth culture in Italy during the economic boom of the late 1950s and early 1960s. Its theoretical framework lies between the studies around Italian youth culture and those around the Italian Communist Party (PCI), investigating the relationship between young people and contemporary society and examining, for the first time, the relationship of the former with the PCI, its institutions and media organs. The arrival of an Anglo-American influenced pop culture (culture transmitted by the media and targeted at young people) and of its market, shaped the individualities of part of the pre-baby boomers that, finally, were able to create bespoke identities somewhat disconnected from the traditional party-related narrative while remaining on the left of the political spectrum. Pop symbols that blossomed in the late 1950s, such as the striped t-shirt, would characterise the style of young protesters who included them in their collective imagination from the early 1960s onwards. Simultaneously, a flourishing pop market gave space to other cultural experiences including Cantacronache, a group of young musicians based in Turin who vividly depicted Italy of the boom through their lyrics. Their efforts can be read as belonging to a pop market that finally starts to open up towards new musical stimuli. They aimed to make their music available beyond the circle of left-wing activism as well and they were produced by a label linked to the PCI that in those years was reshaping its approach towards society, getting rid of its radical fringes and opening to a dialogue with diverse strata of the public, including young people, women and non-members. The thesis investigates how the Communists and its Youth Federation (FGCI), reacted to the development of youth culture as an aspect of modernisation in general. Through an examination of the party’s approach to the youth revolts of the early 1960s and of its formal documents targeted at young people in general, we analyse how – and how successfully – the Communists tried to engage with young people while often, internal strands, the monolithic nature of the party and other elements, posed severe obstacles in meeting their demands, creating a fracture that would grow in the following years. The thesis also investigates how the party’s attempt to address young people was translated into the promotion of magazines in which serious political topics were discussed alongside other themes such as investigations into society and into the “questione giovanile.” In this respect, we will see how the FGCI journal Nuova generazione tried, in the late 1950s, to take account of youth inclinations paying attention to other important topics such as the emancipation of young women. The generation we look at is the first to claim the right to build its individual identities by drawing on pop culture and modernisation, developing codes and behaviours that pulled away from those set by the institutions.
8

Burkhart, Craig. "Approval Voting Theory with Multiple Levels of Approval." Scholarship @ Claremont, 2012. https://scholarship.claremont.edu/hmc_theses/26.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Approval voting is an election method in which voters may cast votes for as many candidates as they desire. This can be modeled mathematically by associating to each voter an approval region: a set of potential candidates they approve. In this thesis we add another level of approval somewhere in between complete approval and complete disapproval. More than one level of approval may be a better model for a real-life voter's complex decision making. We provide a new definition for intersection that supports multiple levels of approval. The case of pairwise intersection is studied, and the level of agreement among voters is studied under restrictions on the relative size of each voter's preferences. We derive upper and lower bounds for the percentage of agreement based on the percentage of intersection.
9

Leão, Marcílio [UNESP]. "Educação matemática e educação ambiental: um estudo etnomatemático das infrações ambientais." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/91032.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Made available in DSpace on 2014-06-11T19:24:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-04-23Bitstream added on 2014-06-13T20:52:41Z : No. of bitstreams: 1 leao_m_me_rcla.pdf: 1826040 bytes, checksum: 1407c4e233d2f21e1d20d1985faa1469 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A pesquisa intitulada: Educação Matemática e Educação Ambiental: um estudo etnomatemático das infrações ambientais é um trabalho etnográfico cujo objetivo é fazer uma proposta para os Estágios de Aperfeiçoamento Profissional dos Policiais Militares Ambientais do Estado de São Paulo/SP. Valho-me da etnomtemática para entender as estratégias matemáticas utilizadas pelos agentes fiscalizadores no âmbito de questões que envolvam a prática dos crimes ambientais. Procuro entender a maneira, os modos, as TICAS de lidar com o ambiente, de explicar os fatos e os fenômenos e compartilhar o MATEMA próprio ao grupo, ao ETNO. Para isso, analiso como se dá a percepção da matemática pelos agentes, a fim de entender as estratégias matemáticas utilizadas por eles no patrulhamento ambiental. Procuro relacionar a prática de seus atos com os conceitos matemáticos, a fim de aprimorar seus desempenhos nas fiscalizações e analiso as relações entre aqueles que praticam um crime ambiental e a polícia. No patrulhamento ambiental, o policial ao lidar com as diferentes modalidades de ocorrências ambientais desenvolve características próprias, peculiares ao serviço de fiscalização. Percebe uma diferença na vegetação, na cúpula das árvores, alteração nas demarcações de extrações, material lenhoso, corte de árvores, desgaste do solo, diferenciação das matas, queimadas, alteração em áreas de preservação permanente, estado das aves (se são selvagens ou domesticadas), enfim, todas essas formas de percepção representam estratégias “próprias”, e nelas estão intrínsecas as noções de distância, de espaço, de tempo, de dimensão. Portanto, noções básicas de matemática. Conhecer estas estratégias matemáticas, possibilita fazer uma intervenção eficiente no que tange auxiliá-los a minimizar a ação daqueles que praticam crimes ambientais
The research entitled Educação Matemática e Educação Ambiental: um estudo etnomatemático da infrações ambientais is an ethnographic work whose goal is to make a proposal Professional Stage for Improvement of the Environmental Military Police of the State of São Paulo/SP. An ethnomatematical approach helps to understand the mathematical strategies used by inspection agents in issues involving the practice of environmental crimes. I try to understand the way the modes, the TICS (techné) of explaining the facts and phenomena, the MATHEMA, which the group share to deal with their environment, their ETHNO. To do this, I look at the perception of Mathematics by the agents, in order to understand the mathematical strategies used by them in environmental patrols. I try to relate their practice with mathematical concepts, in order to improve their performances in the way they check environmental crimes and I analyze the relations between those who practice an environmental crime and the police, in environmental patrol. Policemen have to deal with the different kinds of environmental occurrences and they develop characteristic actions, peculiar to the supervisory service. Noticing differences in vegetation at the top of trees, the boundary changes of extractions, the timber stored, the ways of cutting trees, the soil erosion, the differentiation of thickets, burning, changes in permanent preservation areas, the state of the birds (whether they are wild or domesticated). Ultimately, all of these strategies of perception represent specific kinds of violation, and these depend on notions of distance, time, space, dimension. Therefore, they require understanding mathematics. Knowing these mathematical strategies, the action of policemen may be more efficient in intervening aiming at minimizing the action of those who practice environmental crimes
10

Batarce, Marcelo Salles [UNESP]. "Um contexto histórico para análise matemática para uma educação matemática." Universidade Estadual Paulista (UNESP), 2003. http://hdl.handle.net/11449/91132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Made available in DSpace on 2014-06-11T19:24:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-06-06Bitstream added on 2014-06-13T19:32:04Z : No. of bitstreams: 1 batarce_ms_me_rcla.pdf: 383506 bytes, checksum: 231f5d53973acf2617f4680d679e69eb (MD5)
Neste trabalho caracterizamos duas práticas educacionais. De um lado, o ensino de matemática como sendo toda prática que procura se justificar através da existência de uma única matemática de caráter universal e a priori, e que atribui para si, como missão, a transmissão dessa matemática da forma mais precisa possível. Diante desta concepção nós propomos que a história da matemática para o ensino de matemática tem como pano de fundo uma matemática a priori e que, neste caso, os fatos históricos acabam conectados por uma lógica imposta, de forma implícita, que em última análise está fundamentada em uma concepção de matemática. De outro lado, toda prática que considera determinar e ser determinada por uma concepção de matemática é educação matemática (EM). Assim, a EM considera suas práticas e a matemática como partes de uma dialética. Na EM os estudos de História da Matemática se justificam como um espaço que considera a existência de distintas concepções de matemática. Finalmente, apresentamos um contexto histórico para análise matemática (CHAM) como exemplo de considerações de história da matemática, do ponto de vista da EM caracterizada por nós.
In this paper we understand two different educational practices. On one hand the mathematics teaching as all practice that justify itself because one believe there is a mathematics which is universal and a priori. This way of teaching consider that its mission is merely the transmission of the universal mathematics as accurately as possible. In this sense the history of mathematics as tied up to the concepts and to the logic of this priori science. On the other hand the Mathematics Education as a practice that consider that mathematics is engendered dialectically and because of this take into account different mathematical conceptions. In this sense the studies of mathematics history present several conceptions of mathematics. In this paper we also present a historical context for mathematical analysis (HCMA) as an example of how to understand the history of mathematics from the perspective of mathematics education.
More sources

Books on the topic "91B32":

1

López-Fernández, Andrée Marie, and Antonia Terán-Bustamante, eds. Business Recovery in Emerging Markets. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91532-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Datseris, George, and Ulrich Parlitz. Nonlinear Dynamics. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91032-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Percudani, Mauro, Alessandra Bramante, Valeria Brenna, and Carmine Pariante, eds. Key Topics in Perinatal Mental Health. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91832-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Damian, Maxwell, and Marianne de Visser, eds. Emergencies in Neuromuscular Disorders. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91932-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Rösler, Philipp, and Christian Lindner, eds. Freiheit: gefühlt – gedacht – gelebt. Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91532-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Dudek, Sonja M. Diversity in Uniform? Wiesbaden: VS Verlag für Sozialwissenschaften, 2009. http://dx.doi.org/10.1007/978-3-531-91632-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wrede-Grischkat, Rosemarie. Manieren und Karriere. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Houtman, Joachim. Elemente einer umweltorientierten Produktionstheorie. Wiesbaden: Gabler Verlag, 1998. http://dx.doi.org/10.1007/978-3-322-91332-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Armstrong, Charles I., David Herbert, and Jan Erik Mustad, eds. The Legacy of the Good Friday Agreement. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91232-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Balsamo, Simonetta, Andrea Marin, and Enrico Vicario, eds. New Frontiers in Quantitative Methods in Informatics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91632-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "91B32":

1

Wrede-Grischkat, Rosemarie. "Unternehmensinteresse: Image und Erfolg." In Manieren und Karriere, 23–41. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wrede-Grischkat, Rosemarie. "Standards und Tabus im Ausland." In Manieren und Karriere, 251–414. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wrede-Grischkat, Rosemarie. "Ohne Manieren keine Karriere." In Manieren und Karriere, 43–52. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wrede-Grischkat, Rosemarie. "Korrekte Umgangsformen: Das klassische Repertoire." In Manieren und Karriere, 53–91. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wrede-Grischkat, Rosemarie. "Korrektes Äußeres und Kleiderordnung." In Manieren und Karriere, 93–119. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Wrede-Grischkat, Rosemarie. "Gastgeberpflichten." In Manieren und Karriere, 121–68. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wrede-Grischkat, Rosemarie. "Repräsentationspflichten." In Manieren und Karriere, 169–87. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wrede-Grischkat, Rosemarie. "Zeitgemäße Etikette für Businessfrauen." In Manieren und Karriere, 189–200. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wrede-Grischkat, Rosemarie. "Europäische Esskultur." In Manieren und Karriere, 201–31. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Wrede-Grischkat, Rosemarie. "Geschäftsreisende mit Stil." In Manieren und Karriere, 233–50. Wiesbaden: Gabler Verlag, 2001. http://dx.doi.org/10.1007/978-3-322-91132-2_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "91B32":

1

SPIE, Proceedings of. "Front Matter: Volume 9132." In SPIE Photonics Europe, edited by Christophe Gorecki, Anand K. Asundi, and Wolfgang Osten. SPIE, 2014. http://dx.doi.org/10.1117/12.2070007.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Crowe, Evan D., and Jeffrey P. Bons. "Effects of Dust Composition on Particle Deposition in an Effusion Cooling Geometry." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91032.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract In this study the effects of dust composition on particle deposition in an effusion cooling geometry were investigated through a series of experiments. Single mineral dusts made from five different minerals, Quartz, Dolomite, Albite, Salt, and Gypsum, were milled to similar size distributions (approx. 0–10μm diameter). These dusts were then used in particle deposition tests on a flat plate effusion hole test article which was heated in a kiln to 1116K and supplied with coolant flow heated to 950K. Percent mass flow reduction per gram and deposit morphology were recorded for each test. Results for the different minerals varied greatly ranging from 7.8% to 160% reduction in mass flow per gram injected, with the albite dust producing the greatest blockage. The different dusts also produced varying shapes of deposits. These five dusts were then combined to form a dust blend with the same mass fractions found in AFRL02, a commercially available test dust, and additional tests were conducted using this dust. Results from the tests using the OSU mixed AFRL02 were compared with an estimated blockage per gram found by taking a weighted average of the blockage per gram for each single mineral dust on a percent volume basis. When tested, the mixed AFRL02 produced a lower blockage per gram than the estimate, indicating that an estimate based on volume fraction alone is not sufficient to predict the deposition of dusts composed of a mixture of minerals.
3

Yoon, Christopher, Jacob Moore, and David Bogard. "Evaluation of Film Cooling Superposition Predictions Using Shaped Holes on the Suction Side of a Blade Model." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Film cooling is often used for turbine airfoil cooling, and there are numerous studies of the performance of a single row of holes. In actual application there will typically be multiple rows of holes which interact. Consequently there is a need to develop techniques to predict film cooling performance with multiple rows of coolant holes using superposition of single row cooling effectiveness. Although there have been many studies of superposition techniques for predicting film cooling effectiveness with multiple rows of cylindrical holes, there have been very few in which shaped holes were used with a typical turbine airfoil model. In this study, film effectiveness was measured on the suction side of a turbine blade model using two rows of shaped coolant holes. Measurements were made with each row independently and with both rows combined. This provided the experimental data for superposition predictions and to evaluate these predictions. Each row had 7-7-7 shaped holes with pitch to diameter ratio of 6, and the two rows were more than 40 diameters apart. The experiments were run using two different upstream blowing ratios, and a wide range of downstream blowing ratios. The superposition predictions of film effectiveness were reasonably accurate when the upstream row of holes were operated at a high blowing ratio with a corresponding smaller film effectiveness (due to jet separation). However, when the upstream coolant holes were operated at the optimum blowing ratio, and hence maximum film effectiveness downstream, the superposition analysis predicted film effectiveness levels slightly lower than actual levels. These results show that there was an interaction between jets that resulted in higher film effectiveness than was accounted for with a superposition prediction.
4

Tong, Michael T. "Using Machine Learning to Predict Core Sizes of High-Efficiency Turbofan Engines." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91432.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract With the rise in big data and analytics, machine learning is transforming many industries. It is being increasingly employed to solve a wide range of complex problems, producing autonomous systems that support human decision-making. For the aircraft engine industry, machine learning of historical and existing engine data could provide insights that help drive for better engine design. This work explored the application of machine learning to engine preliminary design. Engine core-size prediction was chosen for the first study because of its relative simplicity in terms of number of input variables required (only three). Specifically, machine-learning predictive tools were developed for turbofan engine core-size prediction, using publicly available data of two hundred manufactured engines and engines that were studied previously in NASA aeronautics projects. The prediction results of these models show that, by bringing together big data, robust machine-learning algorithms and automation, a machine learning-based predictive model can be an effective tool for turbofan engine core-size prediction. The promising results of this first study paves the way for further exploration of the use of machine learning for aircraft engine preliminary design.
5

Masi, Massimo, and Andrea Lazzaretto. "A New Practical Approach to the Design of Industrial Axial Fans: Part II — Forward-Swept Blades With Low Hub-to-Tip Ratio." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91532.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract The authors previously suggested a simple method to design forward-swept axial-flow rotors with blades having low hub-to-tip and high aspect ratios. This design method was demonstrated experimentally to increase the aeraulic performance of a small tube-axial fan having unswept blades and 0.4 hub-to-tip ratio, while maintaining the efficiency in the entire operation range. However, the method has not yet been assessed by experimental tests of lower hub-to-tip ratio designs where the strong three-dimensionality of the actual blade passage flow could compromise its validity. This assessment is the object of the present paper, which is aimed at examining the practical effectiveness of the forward-swept blade design method for low hub-to-tip ratio tube-axial fans. To this end, past results of the authors’ work are supported here by the design of a new 315mm forward-swept industrial fan derived from the 0.28 hub-to-tip ratio design presented in Part I of this paper. The ISO-5801 aerodynamic performance tests at blade Reynolds number of approximately 60,000 show that the method permits the design of forward-swept industrial fans capable of pressure coefficients in excess of 0.02 at aeraulic efficiency well above 60%, in a wide range of flow rate coefficients and blade positioning angles. Moreover, the method allows obtaining a pressure coefficient equal to 0.021 at 70% maximum efficiency, with an improvement of both the stall margin and stable operation pressure curve of the unswept design, if applied in combination with the complete fan design method presented in Part I of this paper.
6

Waldren, J. J., C. J. Clark, S. D. Grimshaw, and G. Pullan. "Non-Dimensional Parameters for Comparing Conventional and Counter-Rotating Turbomachines." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91632.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Counter-rotating turbomachines have the potential to be high efficiency, high power density devices. Comparisons between conventional and counter-rotating turbomachines in the literature make multiple and often contradicting conclusions about their relative performance. By adopting appropriate non-dimensional parameters, based on relative blade speed, the design space of conventional machines can be extended to include those with counter-rotation. This allows engineers familiar with conventional turbomachinery to transfer their experience to counter-rotating machines. By matching appropriate non-dimensional parameters the loss mechanisms directly affected by counter-rotation can be determined. A series of computational studies are performed to investigate the relative performance of conventional and counter-rotating turbines with the same non-dimensional design parameters. Each study targets a specific loss source, highlighting which phenomena are directly due to counter-rotation and which are solely due to blade design. The studies range from two-dimensional blade sections to three-dimensional finite radius stages. It is shown that, at hub-to-tip ratios approaching unity, with matched non-dimensional design parameters, the stage efficiency and work output are identical for both types of machine. However, a counter-rotating turbine in the study is shown to have an efficiency advantage over a conventional machine of up to 0.35 percentage points for a hub-to-tip ratio of 0.65. This is due to differences in absolute velocity producing different spanwise blade designs.
7

Kelley, Christopher R., and Jeffrey L. Kauffman. "Effect of Switching Impulse on Piezoelectric-Based Vibration Reduction With Multiple Patches." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91832.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Piezoelectric-based vibration reduction has the potential to improve the lifetime and structural integrity of turbomachinery blades by reducing the risk of high-cycle fatigue. Semi-active techniques produce small, self-powered implementations that can meet the strict design requirements for rotating machinery. Most semi-active techniques switch piezoelectric transducers between an open circuit and a shunt circuit in a way that reduces vibration. However, these switches produce a small impulse on the structure due to the electromechanical coupling of the piezoelectric material. Since multiple-mode vibration reduction typically requires distributed sections of piezoelectric material, the switching impulse generated by one transducer may affect others. This study investigates the effect of the switching impulse on the non-switched piezoelectric transducers. Experimental testing shows the switching impulse induces a voltage response at the natural frequencies of the structure, with the strongest responses occurring at modes where both the switched and non-switched piezoelectric transducers have high electromechanical coupling. Furthermore, piezoelectric sections that lack coupling at the excitation frequency of the structure exhibit a more noticeable response to the switching impulse. This response enables remote sensing of switches, which may facilitate wireless coordinated switch timing.
8

Endurthy, Akhilesh Reddy, and T. Agami Reddy. "A Screening Methodology for Climatic Evaluation of the Cooling Potential of Night Ventilation in Buildings." 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/es2012-91032.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Night ventilation is a well known strategy for passive cooling of residences and small commercial buildings. The building’s thermal mass can be cooled at night by ventilating the inside of the space with the relatively lower outdoor air temperatures, thereby lowering indoor temperatures during the warmer daytime period. Numerous experimental and theoretical studies have shown the effectiveness of the method to significantly reduce air conditioning loads or improve comfort levels in those climates where the night time ambient air temperature drops below that of the indoor air. One could develop/adapt computer programs with detailed mathematical component models to simulate and evaluate the performance of night ventilation strategies in a specific location for a particular building. A more basic problem is to develop a methodology whereby potential designers can screen various climatic locations and regions in order to perform a preliminary evaluation of which months of the year are good candidates for implementing such a scheme. Only after completion of such a phase is a detailed evaluation warranted for specific buildings. In this paper, effectiveness of night ventilation is quantified by a parameter called the Discomfort Reduction Factor (DRF) which is the index of reduction of occupant discomfort levels during the day time from night ventilation. Two different thermal network models which provide such insights are evaluated. Daily and monthly DRFs are calculated for two climate zones and three building heat capacities for the whole year. It is verified that night ventilation is effective in seasons and regions when day temperatures are between 30 °C and 36 °C and night temperatures are below 20 °C. The accuracy of these preliminary screening models may be lower than using a detailed simulation program but the loss in accuracy in using such tools is more than compensated by the insights provided, along with better transparency in the analysis approach and results obtained.
9

Graber, Benjamin D., Athanasios P. Iliopoulos, John G. Michopoulos, John C. Steuben, Andrew J. Birnbaum, Edward P. Gorzkowski, Eric A. Patterson, Richard P. Fischer, George M. Petrov, and Luke A. Johnson. "Localized Dielectric Sintering With Magnetron for Microwave Material Processing." 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/detc2022-91132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract The process of sintering occurs when enough heating energy is applied on the particles of precursor powders to coalesce together and form a solid material without melting. Solidification takes place through cross mass diffusion along common interfaces and this technique has been used extensively by the materials processing community for ceramic part manufacturing. However, in most cases, furnaces are being used to elevate the temperature of material powder precursors globally throughout the entire volume of the intended parts. Instead of this approach, the present work explores the feasibility of using localized heating induced by coherent microwave radiation. Microwave-based material processing involves coupling between thermal and electromagnetic physics where the microwave radiation heats the sample locally via volumetrically tailored heat fluxes. However, changes in temperature change the dielectric properties of the sample, which then in turn affect microwave propagation. The nonlinearity introduced by the temperature dependence of the material properties into the relevant partial differential equations of this coupled system is further complicated by poorly defined dielectric, thermal, and thermo-electric properties of the dielectric precursor powders at temperatures required for sintering. This work focuses on analyzing a TE106 2.45 GHz microwave cavity used for processing BaTiO3, or BTO, precursor powder. Both a physical and a virtual experiment were carried out in tandem to understand the microwave propagation and dielectric property evolution with respect to temperature. It was demonstrated that appropriate tuning of the material properties (i.e., density, specific heat, heat conductivity, dielectric permittivity and loss tangent) relative to temperature enabled localized heating predicted by our model to match that of the physical experiment.
10

Lei, V. M., Z. S. Spakovszky, and E. M. Greitzer. "A Criterion for Axial Compressor Hub-Corner Stall." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91332.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
This paper presents a new criterion for estimating the size and strength of three-dimensional hub-corner stall in rotors and shrouded stators of multi-stage axial compressors. A simple, first-of-a-kind description for the formation of hub-corner stall is derived, consisting of (i) a stall indicator, which quantifies the extent of the reversed flow via the local blade loading and thus indicates whether corner stall occurs, and (ii) a diffusion parameter which defines the diffusion limit. The stall indicator can be cast in terms of a Zweifel loading coefficient. The diffusion parameter is based on preliminary design type flow variables and geometry. Computational simulations and single and multi-stage compressor data are used to show the applicability of the criterion over a range of blade design parameters. The criterion also enables determination of specific flow control actions needed to mitigate hub-corner stall. To illustrate the latter a flow control blade, designed using the ideas developed, is seen to achieve a substantial reduction in the flow non-uniformity associated with hub-corner stall.

To the bibliography