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Статті в журналах з теми "46L55":
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Farsi, Carla. "SOFT C*-ALGEBRAS." Proceedings of the Edinburgh Mathematical Society 45, no. 1 (February 2002): 59–65. http://dx.doi.org/10.1017/s0013091500000547.
Анотація:
AbstractIn this paper we consider soft group and crossed product $C^*$-algebras. In particular we show that soft crossed product $C^*$-algebras are isomorphic to classical crossed product $C^*$-algebras. We also prove that large classes of soft $C^*$-algebras have stable rank equal to infinity.AMS 2000 Mathematics subject classification: Primary 46L80; 46L55
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Deicke, Klaus. "THE CROSSED PRODUCT BY A POINTWISE UNITARY ACTION ON A C*-ALGEBRA WITH CONTINUOUS TRACE." Proceedings of the Edinburgh Mathematical Society 44, no. 1 (February 2001): 215–18. http://dx.doi.org/10.1017/s0013091500000195.
Анотація:
AbstractLet $G$ be a locally compact group, $A$ a continuous trace $C^*$-algebra, and $\alpha$ a pointwise unitary action of $G$ on $A$. It is a result of Olesen and Raeburn that if $A$ is separable and $G$ is second countable, then the crossed product $A\times_\alpha G$ has continuous trace. We present a new and much more elementary proof of this fact. Moreover, we do not even need the separability assumptions made on $A$ and $G$.AMS 2000 Mathematics subject classification: Primary 46L55
3
ㅤ. "Vos / Vos (TvAR 1993/4655)." Tijdschrift voor Agrarisch Recht 53, no. 11 (November 1, 1993): ㅤ. http://dx.doi.org/10.5117/tvar1993.11.008.
4
Kretschmer, A. E., R. M. Sonoda, R. C. Bullock, and T. C. Wilson. "Registration of IRFL 4655 Macroptilium Atropurpureum Germplasm." Crop Science 32, no. 3 (May 1992): 836. http://dx.doi.org/10.2135/cropsci1992.0011183x003200030066x.
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Harapan Parlindungan Ringoringo, Jun Rahmawati Surya Mentari, Roselina Panghiyangani, Edi Hartoyo, and Rahmiati Lao. "Hematological profile of children under five years with typhoid fever at Idaman Banjarbaru Hospital, Indonesia." Bali Medical Journal 11, no. 2 (July 30, 2022): 775–78. http://dx.doi.org/10.15562/bmj.v11i2.2669.
Анотація:
Introduction: Typhoid fever is a disease caused by Salmonella typhi, Salmonella paratyphi A, B, C. An estimated 200,000 people die each year from about 21.6 million people infected with typhoid fever. This study aims to determine the hematological profile in typhoid fever cases in children under five at Idaman Banjarbaru Hospital. Methods: The research was carried out with a retrospective descriptive approach with a consecutive sampling technique. The research subjects were children under five diagnosed with typhoid fever recorded in the Idaman Banjarbaru Hospital's medical records for July 2018 to January 2019. Results: The sample consisted of 58 patients, 32 boys, and 26 girls. Most patients were found in 12 - <36 months, namely 28 (48.28%) children. Thirty-eight (65.52%) children have a normal weight. The hematological profile showed that 46.55% of the patients had iron deficiency anemia (IDA). Hematocrit levels decreased in 51.72% of patients. Erythrocyte levels in 86.21% of patients were normal. Low MCV, low MCH, IDA were found in 46.55%, 36.21%, 46.55% of patients. Leukopenia was present in 17.24% of children. All patients had normal basophil values. Eosinopenia, band neutropenia, segmented neutropenia, lymphocytosis, monocytosis were found in 69.09%, 90.90%, 56.37%, 58.18%, 58.18% of children, respectively. Thrombocytopenia and thrombocytosis were found in the same percentage, 13.80%. Conclusion: The haematological profile of typhoid fever patients in children under five can have different results depending on each child's body's response to S. typhi and S. paratyphi that enter the body.
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González, N. Castro, J. J. Koliha, and Yimin Wei. "ON INTEGRAL REPRESENTATIONS OF THE DRAZIN INVERSE IN BANACH ALGEBRAS." Proceedings of the Edinburgh Mathematical Society 45, no. 2 (June 2002): 327–31. http://dx.doi.org/10.1017/s0013091500000523.
Анотація:
AbstractThe purpose of this paper is to derive an integral representation of the Drazin inverse of an element of a Banach algebra in a more general situation than previously obtained by the second author, and to give an application to the Moore–Penrose inverse in a $C^*$-algebra.AMS 2000 Mathematics subject classification:Primary 46H05; 46L05
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Kumar, Ajay. "INVOLUTION AND THE HAAGERUP TENSOR PRODUCT." Proceedings of the Edinburgh Mathematical Society 44, no. 2 (June 2001): 317–22. http://dx.doi.org/10.1017/s0013091599000772.
Анотація:
AbstractWe show that the involution $\theta(a\otimes b)=a^*\otimes b^*$ on the Haagerup tensor product $A\otimes_{\mrm{H}}B$ of $C^*$-algebras $A$ and $B$ is an isometry if and only if $A$ and $B$ are commutative. The involutive Banach algebra $A\otimes_{\mrm{H}}A$ arising from the involution $a\otimes b\to b^*\otimes a^*$ is also studied.AMS 2000 Mathematics subject classification: Primary 46L05; 46M05
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Deussen, Heinz-Josef, Lone Jeppesen, Norbert Schärer, Finn Junager, Bjørn Bentzen, Beat Weber, Volker Weil, Sandor Josef Mozer, and Per Sauerberg. "Process Development and Scale-Up of the PPAR Agonist NNC 61-4655." Organic Process Research & Development 8, no. 3 (May 2004): 363–71. http://dx.doi.org/10.1021/op034048j.
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Raeburn, Iain, Aidan Sims, and Trent Yeend. "HIGHER-RANK GRAPHS AND THEIR $C^*$-ALGEBRAS." Proceedings of the Edinburgh Mathematical Society 46, no. 1 (January 27, 2003): 99–115. http://dx.doi.org/10.1017/s0013091501000645.
Анотація:
AbstractWe consider the higher-rank graphs introduced by Kumjian and Pask as models for higher-rank Cuntz–Krieger algebras. We describe a variant of the Cuntz–Krieger relations which applies to graphs with sources, and describe a local convexity condition which characterizes the higher-rank graphs that admit a non-trivial Cuntz–Krieger family. We then prove versions of the uniqueness theorems and classifications of ideals for the $C^*$-algebras generated by Cuntz–Krieger families.AMS 2000 Mathematics subject classification: Primary 46L05
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Kribs, David W. "QUANTUM CHANNELS, WAVELETS, DILATIONS AND REPRESENTATIONS OF $\mathcal{O}_{n}$." Proceedings of the Edinburgh Mathematical Society 46, no. 2 (June 2003): 421–33. http://dx.doi.org/10.1017/s0013091501000980.
Анотація:
AbstractWe show that the representations of the Cuntz $C^*$-algebras $\mathcal{O}_n$ which arise in wavelet analysis and dilation theory can be classified through a simple analysis of completely positive maps on finite-dimensional space. Based on this analysis, we find an application in quantum information theory; namely, a structure theorem for the fixed-point set of a unital quantum channel. We also include some open problems motivated by this work.AMS 2000 Mathematics subject classification: Primary 46L45; 47A20; 46L60; 42C40; 81P15
Дисертації з теми "46L55":
1
Zeng, Kai. "Some problems in harmonic analysis on twsited crossed products." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCD048.
Анотація:
Cette thèse a pour but d’étudier quelques problèmes dans l'analyse harmonique sur les produits croisés tordus qui sont définis par des actions tordues d'un groupe localement compact G sur une algèbre de von Neumann M. Elle se compose de deux parties. La première porte sur les produits croisés tordus et leurs multiplicateurs de Fourier et de Schur. Nous démontrons que la propriété d’être QWEP pour l’algèbre de von Neumann tordue d’un groupe G est indépendante du 2-cocycle sous-ajacent et que les Lp-multiplicateurs de Fourier complètement bornés sur cette algèbre tordue sont aussi indépendants du 2-cocycle. Sous l’hypothèse d’une action moyennable, nous établissons plusieurs résultats de transfert entre les multiplicateurs de Fourier et de Schur sur les espaces Lp non-commutatifs du produit croisé tordu.Dans la deuxième partie, nous étudions les commutateurs de multiplicateurs de Fourier sur le produit croisé tordu d’un espace euclidien. Nous caractérisons leur appartenance à la p-classes de Schatten par celle de leurs symboles à un espace de Besov associé. Cette partie contient aussi une formule sur la trace de Dixmier qui nous donne également une caractérisation de l’appartenance de ces commutateurs à une p-classe de Schatten faible par un espace de Sobolev. En particulier, nos résultats s'appliquent au cas d’un espace euclidien quantiqueThis thesis is devoted to the study of some problems in the harmonic analysis on twisted crossed products defined by twisted actions of a locally compact group G on a von Neumann algebra M. It consists of two parts. The first concerns twisted crossed products and their Fourier and Schur multipliers. We prove that the property of being QWEP for the twisted von Neumann algebra of a group G is independent of the underlying 2-cocycle and that the completely bounded Lp-Fourier multipliers on this twisted algebra are also independent of the 2-cocycle. Under the hypothesis of an amenable action, we establish several transference results between the Fourier and Schur multipliers on the noncommutative Lp spaces of the twisted crossed product.In the second part, we study Fourier multiplier commutators on the twisted crossed product of an Euclidean space. We characterize their Schatten p-class membership by that of their symbols in the associated Besov space. In addition, this part contains a formula on the Dixmier trace, which also gives us a characterization of the weak Schatten p-class membership of these commutators by a Sobolev space. In particular, our results apply to the case of quantum Euclidean spaces
2
Mossa, Abdul Wahab. "The impact of long term biosolid application on soil health." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/46255/.
Анотація:
The disposal of biosolids poses a major environmental and economic problem. Agricultural use is generally regarded as the best means of disposal. Although the impact on soil ecosystems remains uncertain. Biosolids can improve soil properties by supplying nutrients and increasing organic matter content but there is also a potentially negative impact arising from the introduction of heavy metal contaminants into soils. It is widely acknowledged that the bioavailable fraction, rather than total metal content, is indicative of plant metal uptake and toxicity. The bioavailable metal fraction in turn is dependent on soil properties. Therefore, the overall aim of this work was to determine the bio-geochemical factors that control the dynamics of trace element bioavailability in soils that have been subject to the disposal of sewage sludge for over 100 years. Three main investigations were undertaken. In order to determine the current metal composition of the site and identifying the geochemical factors that control the dynamics of metals bioavailability, thirty -eight fields, from a dedicated sewage sludge disposal site for over 100 years, were sampled for both soil (bulk and rhizosphere) and plant. Special attention was devoted to determining soil properties that govern metal partitioning between different metal pools (i.e. total, isotopically exchangeable, Ca(NO3)2-extractable and free ion activity). In order to identify the best estimate of plant uptake and toxic response, a pot experiment was carried out to compare the effects of Zn on plant growth in soils recently spiked with Zn and soils historically amended with biosolids to identify soil properties that best predict metal uptake and subsequent phytotoxicity. The effect of biosolids on soil microorganisms was assessed. Terminal restriction fragment length polymorphism, a fingerprint molecular technique, in combination with multivariate data analysis were used to relate soil microbial diversity and community structure to metal accumulation and bioavailability. High levels of contamination, exceeding the current limits for the use of biosolids in agriculture, were observed in the studied soils reflecting extensive long-term biosolid application. Enrichment factors in relation to background levels in the area were greater than 5 and followed the trend Cd>Cu>Zn>Pb>Ni. Copper and Cd exhibited extremely high enrichment levels, up to 106 and 151 respectively. Except for Pb, the isotopically exchangeable pool of the studied metals (E-value) was mainly controlled by the total metal content in soil, accounting for more than 90% of the variation in E-values. Lead lability was primarily controlled by the total P, LOI and Fe oxides. Metal labilities expressed as % of total metal content were < 40% for the five studied elements following decreasing order of Cu > Cd > Zn ≈ Ni > Pb. Apart from Pb, all the bioavailability estimates (total, E-values, Ca(NO3)2-extractable and free ion activity) correlated strongly with metal concentration in plant, accounting for more than 70% of the variation in plant concentrations. Ca(NO3)2-extractable provided the best estimate out of the four measures of bioavailability, accounting for 87, 77, 87 and 83% of the variation in plant concentration of Ni, Cu, Zn and Cd respectively. The results of the pot trial showed that 67-90% of the added Zn remained isotopically exchangeable after 3 months of Zn addition, suggesting that rapid adsorption processes take place, followed by a slow aging process that cannot be detected over the period of the experiment (3 months). The speciation of soil solution showed that Zn was present mainly (80% on average) as free ion indicating the low affinity of this metal to complexation by dissolved organic matter. An antagonistic relationship was observed between Zn and Cd suggesting that greater Zn availability suppressed Cd uptake by plant. Although Zn addition increased Cd concentration in the soil solution, Cd transfer factor was simultaneously inversely correlated with Zn concentration in soil solution. The free ion activity model (FIAM), based on the biotic ligand model (BLM), accounted for 94% of the variation Zn concentration in plant. Cadmium appeared to play an important role in competing with Zn for uptake. A simple regression model utilising soil total Zn, soil organic matter and soil pH accounted for 88% of the variation in plant uptake. This indicates the possibility of using soil properties that are measured routinely as input for prediction of plant uptake. The results of the Zn phytotoxicity test indicated that the intensity of the exposure (i.e. free ion activity) was the key quantity in the context of predicting plant toxic response, describing 80% of the variation in the response of barley growth to Zn toxicity. Only labile Zn from the quantity based extraction was able to describe the toxic response explaining only 46% of the variation. The study of the effect of biosolids on soil microorganisms showed that soil total Zn concentration could be adopted as a good indicator of the overall (historical) biosolids loading. A biosolids loading, equivalent to 700 – 1000 mg kg-1 Zn appeared to be optimal for maximum bacterial and fungal diversity. This markedly exceeds the maximum soil Zn concentration of 300 mg kg-1permitted under the current UK Sludge (use in agriculture) Regulations. Redundancy analysis (RDA) suggested that the soil microbial communities had been altered in response to the accumulation of trace metals, especially Zn, Cd, and Cu. Based on the findings of this thesis, it can be concluded that (i) the estimation of metal speciation, both in the solution and solid phase is a key factor in determining the bioavailability and thus, has greater chemical and biological significance than soil total metal content; (ii) the maximum beneficial effect of biosolids on soil microbial diversity occurred at a metal (Zn) concentration well in excess of current regulations governing application of biosolids to agricultural land. This indicates that soil microbial diversity is unlikely to be determining factor for regulatory limits for biosolids disposal to agricultural lands.
3
McKillop, Kirsten Ann. "An exploration of the psychosocial consequences of delayed puberty in children who attend the Royal Hospital for Sick Children Endocrine Clinic : a qualitative study and clinical research portfolio." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4655/.
Анотація:
Background: Puberty is considered to be delayed if sexual maturation occurs beyond 13 years in girls and 14 years in boys. Physical consequences of delayed puberty include short stature and immature appearance, relative to their chronological age. Psychosocial consequences include social withdrawal and isolation, teasing and bullying, parental over protection, poor body image, low self-esteem and declining academic performance. Research findings in this area can be conflicting with most of the focus being upon delayed growth. Consequently, the psychosocial impact of delayed puberty remains unclear. This study aimed to explore adolescents’ experiences of delayed puberty from a psychosocial perspective. Method: Five adolescents with delayed puberty attending the Royal Hospital for Sick Children were recruited to the study. Semi-structured interviews were conducted, recorded and transcribed. The data were analysed using Interpretative Phenomenological Analysis. Results: Analysis identified five super-ordinate themes: Confusion Surrounding Diagnosis, Adolescents’ Internal Experience, Adolescents’ External Experience, Coping and Future Prognosis. They reported a range of emotional, behavioural, social and psychological affects. Adolescents utilised various maladaptive and adaptive coping strategies to help them manage the consequences they experience. They reported feelings of confusion and uncertainty surrounding their diagnosis and treatment which may be contributing to the emotional and psychological symptoms. Conclusion: Adolescents reported that delayed puberty only affects certain areas of their life and that they are generally happy with who they are. This study emphasises the importance of adolescents receiving clear information about delayed puberty and its treatment as soon as possible when they first attend the endocrine clinic to help manage the psychological and emotional consequences reported.
4
Fulford, Katy A. "Oculomotor responses and 3D displays." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4655/.
Анотація:
This thesis investigated some of the eye movement factors related to the development and use of eye pointing devices with three dimensional displays (stereoscopic and linear perspective). In order for eye pointing to be used as a successful device for input-control of a 3D display it is necessary to characterise the accuracy and speed with which the binocular point of foveation can locate a particular point in 3D space. Linear perspective was found to be insufficient to elicit a change in the depth of the binocular point of fixation except under optimal conditions (monocular viewing, accommodative loop open and constant display paradigm). Comparison of the oculomotor responses made between a stereoscopic 'virtual' and a 'real' display showed there were no differences with regards to target fixational accuracy. With one exception, subjects showed the same degree of fixational accuracy with respect to target direction and depth. However, close target proximity (in terms of direction) affected the accuracy of fixation with respect to depth (but not direction). No differences were found between fixational accuracy of large and small targets under either display conditions. The visual conditions eliciting fast changes in the location of the binocular point of foveation, i.e. saccade disconjugacy, were investigated. Target-directed saccade disconjugacy was confirmed, in some cases, between targets presented at different depths on a stereoscopic display. However, in general the direction of saccade disconjugacy was best predicted by the horizontal direction of the target. Leftward saccade disconjugacy was more divergent than rightward. This asymmetry was overlaid on a disconjugacy response, which when considered in relative terms, was appropriated for the level of vergence demand. Linear perspective depth cues did not elicit target-directed disconjugate saccades.
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Cecchini, Lucas. "Dimensionamento e modellazione di un dispositivo di bloccaggio per elementi tubolari da installare su macchine perforatrici ad asse verticale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4655/.
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Spencer, Peter. "Cognitive bias and heuristics and their effects on clinical judgement amongst psychological therapists: a review, and, Problem solving in an empathic task: an experimental study of expertise and intuition." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4655/.
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Kriguel, Karina. "Determinação da difusidade térmica e da curva de secagem de lodos e escumas sanitários." reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/46155.
Анотація:
Orientador : Profª. Drª. Karen Juliana do AmaralCo-orientador : Prof. Dr. Gustavo Rafael Collere Possetti
Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Mestrado Profissional em Meio Ambiente Urbano e Industrial, em parceria com o Serviço Nacional de Aprendizagem Industrial e a Universität Stuttgart. Defesa: Curitiba, 13/11/2015
Inclui referências: f. 93-98
Resumo: Os processos de tratamento de água e de esgoto geram resíduos, tais como lodo e escuma sanitários. O gerenciamento desses materiais, no entanto, não é trivial e pode representar mais da metade dos custos operacionais de uma planta. Por isso, nos últimos anos, alternativas para manejo e disposição final de lodos e de escumas vêm sendo amplamente discutidas no setor de saneamento. A secagem térmica e a pasteurização são técnicas que, além de promover a higienização, reduzem o volume do lodo. No entanto, o dimensionamento de equipamentos de secagem térmica depende do levantamento de algumas propriedades térmicas intrínsecas aos materiais que se pretende processar. Dentre essas propriedades destacam-se a difusividade térmica e a curva de secagem. Cabe destacar que estudos referentes à curva de secagem e difusividade térmica ainda são incipientes, sobretudo aqueles que se referem a lodos e escumas gerados no Brasil. Nesse contexto, o objetivo deste trabalho foi quantificar experimentalmente a difusividade térmica e a curva de secagem de lodos oriundos dos processos de tratamento de água e de esgoto, bem como de escumas, com o intuito de estabelecer parâmetros para projetos de secagem e higienização desses materiais por via térmica. Para tanto, inicialmente, coletaram-se amostras de lodos provenientes do tratamento anaeróbio e do tratamento aeróbio de esgoto doméstico, bem como amostras de escuma anaeróbia e de lodo oriundo do tratamento de água. Para a determinação da curva de secagem dos materiais coletados, utilizou-se um medidor de umidade termogravimétrico programado para operar a 103 e a 140 °C. Para a determinação da difusividade térmica dos lodos e escumas foram obtidas cinco concentrações diferentes de sólidos totais por meio de secagem em estufa a 103 °C e, em seguida, mensuraram-se as difusividades térmicas dessas amostras, considerando-as como meios porosos de baixa condutividade térmica. As curvas de secagem demonstraram que o lodo aeróbio possui a secagem mais acelerada dentre as amostras avaliadas, enquanto que o lodo de ETA apresenta maior dificuldade de desidratação. Verificou-se que o tempo de secagem é dependente da temperatura e que a elevação para 140 °C reduz o tempo de secagem dos lodos e da escuma. Os resultados de difusividade térmica demonstraram que o lodo aeróbio possui os menores valores, dentre as amostras avaliadas, apresentando os resultados entre (0,94 ± 0,09) a (2,14 ± 0,02)x10-3cm2.s-1 para as concentrações de (0,90 ± 0,10) e (1,5 ± 0,17)% de sólidos totais, respectivamente, enquanto que a escuma apresenta os maiores valores, sendo (1,47 ± 0,06) a (2,24 ± 0,05)x10-3cm2.s-1 para as concentrações de (80,9 ± 0,18) e (18,4 ± 0,62)%, respectivamente. Além disso, constatou-se que as difusividades térmicas dos lodos e da escuma dependem do teor de sólidos totais neles contidos e que o aumento do teor de sólidos totais dificulta o fluxo de calor pelos materiais. Modelos de regressão foram propostos para descrever tal comportamento. Palavras-chave: Difusividade térmica. Curva de secagem. Secagem térmica. Lodos. Escumas.
Abstract: The water and sewage treatment processes generate waste, such as sanitary sludge and scum. The management of these materials, however, is not trivial and may represent more than half of the operating costs of a plant. Therefore, in last few years, alternatives for the management and final disposal of sludge and scum have been largely discussed in the sanitation sector. The thermal drying and pasteurization are techniques that promote hygiene and reduce bulk sludge and scum. However, the dimensioning of thermal drying equipment depends on the knowing of some thermal properties inherent to the materials. Among these properties are the thermal diffusivity and the drying curve. It should be reported that studies about drying curve and thermal diffusivity are still incipient, especially those that refer to sludge and scum generated in Brazil. In a sense, the aim of this study was to quantify, by mean of experiments, the thermal diffusivity and the sludge drying curve from the water and sewage treatment process, as well as scum, in order to establish parameters for drying and hygienization projects of these materials by thermal means. For that, initially, some samples of sludges from both anaerobic and aerobic treatment of domestic sewage, anaerobic scum and sludge from the water treatment were collected. For the determination of the drying curve was used a moisture meter thermogravimetric programmed to operate at 103 and 140 °C. To determine the thermal diffusivity of the sludges and scum were obtained five different concentrations of total solids by drying in an oven at 103 ° C. Then the thermal diffusivities were measured, considering them as porous media with low thermal conductivity. The drying curves demonstrated that aerobic sludge has a faster drying, when compared with other evaluated samples, while the water sludge is more difficult to dehydration. It was found that the drying time depends on temperature and at 140 ° C there were a reduction on drying time of the sludges and scum. The results demonstrated that the aerobic sludge has a lower thermal diffusivity, whith values between (0,94 ± 0,09) to (2,14 ± 0,02)x10-3.cm2.s-1, for concentrations of (0,90 ± 0,10) and (1,5 ± 0,17)% of total solids, respectively, while the scum has the higher values, whith values between 1,47 ± 0,06) to (2,24 ± 0,05)x10-3cm2.s-1, for concentrations of (80,9 ± 0,18) e (18,4 ± 0,62)%, respectively . Besides, it was determined that the thermal diffusivity of the sludges and scum depend on the total solids content and the increase of total solids content decrease the heat flow through the materials. Empiric regression models were computed to describe such behavior. Key-words: Thermal diffusivity. Drying curve. Thermal drying. Sludge. Scum.
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Vavolizza, Renata. "Estudo sobre a aplicabilidade da teoria cradle to cradle C2C para a empresa têxtil catarinense." reponame:Repositório Institucional da UFPR, 2016. http://hdl.handle.net/1884/46255.
Анотація:
Orientadora: Profª Drª. Liliane Iten ChavesDissertação (mestrado) - Universidade Federal do Paraná, Setor de Artes, Comunicação e Design, Programa de Pós-Graduação em Design. Defesa: Curitiba, 29/02/2016
Inclui referências : f. 147-150
Resumo: Esta pesquisa apresenta possibilidades de inserção de práticas sustentáveis no processo produtivo têxtil, a partir de uma abordagem sistêmica e sustentável em design. Investigou-se a possibilidade de propor o principal conceito da teoria Cradle to Cradle - a Ecoefetividade - no contexto das indústrias têxteis ou de confecção em Santa Catarina. A pesquisa iniciou com uma Revisão Bibliográfica Sistemática (RBS), posteriormente foi realizada uma Revisão Bibliográfica Exploratória, somando-se dados coletados em Instituições como SENAI e FIESC. O levantamento de literaturas existentes construiu a fundamentação teórica, com ênfase na teoria Cradle to Cradle do designer William McDonough e do químico Michael Braungart. Devido a indústria têxtil possuir especificidades e uma cadeia produtiva complexa, a pesquisa configurouse como um Estudo de Caso. A coleta de dados deu-se com entrevistas semiestruturadas de resposta aberta, aplicadas a seis steakholders de uma indústria de médio porte do norte catarinense e com a utilização da observação direta, sendo aplicado a observação espontânea e a observação sistemática, elaboradas conjuntamente com a entrevista. A pesquisa contempla uma Fundamentação teórica sobre Design para a sustentabilidade, a construção do Método de pesquisa de um Estudo de Caso, com todos os preceitos de Ecoeficiência e de Ecoefetividade. A estratégia de análise expõe os dados coletados de forma sistemática, apresentando os resultados em concordância com os objetivos de pesquisa. O conjunto do documento promove subsídios para esta Dissertação de Mestrado, que pretende contribuir com a sociedade acadêmica e industrial, e disseminar informações sobre práticas de sustentabilidade aplicáveis no setor têxtil e de confecção, que permitam embasamento específico para a construção de novos projetos de design. Palavras-chave: Indústria têxtil, Sustentabilidade, Design têxtil sustentável.
Abstract: This research presents possibilities of integration of sustainable practices in the textile production process, from a systemic and sustainable approach to design. We investigated the possibility of proposing the main concept of the theory Cradle to Cradle - the Ecoefetividade - in the context of textiles or clothing in Santa Catarina. The research began with a Bibliographical Systematic Review (RBS) a Literature Review Exploratory was subsequently held, adding to data collected from institutions such as SENAI and FIESC. The survey of existing literature built the theoretical foundation, emphasizing the theory Cradle to Cradle designer William McDonough and chemist Michael Braungart. Because the textile industry has specific and complex production chain, the research was configured as a case study. The data was collected with semistructured interviews with open response, applied to six steakholders of a medium-sized industry in Santa Catarina North and the use of direct observation, applied spontaneous observation and systematic observation, developed jointly with interview. The research includes a theoretical Grounds on design for sustainability, the construction of the research method of a case study, with all the precepts of eco-efficiency and Ecoefetividade. The analysis strategy exposes the data collected systematically, presenting the results in accordance with the research objectives. The document set promotes subsidies for this Master thesis, which aims to contribute to the academic and industrial society, and disseminate information about sustainability practices applicable in the textile and apparel sector that allow specific basis for the construction of new design projects. keywords: Textile industry, sustainability, Sustainable textile design.
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Balbino, Fernanda Oliveira. "Estimação de propriedades dinâmicas de materiais viscoelásticos utilizando abordagem bayesiana." reponame:Repositório Institucional da UFPR, 2016. http://hdl.handle.net/1884/46355.
Анотація:
Orientador : Prof. Dr. Carlos Alberto BavastriCoorientadores : Prof. PhD. Eduardo M. O. Lopes e Prof. PhD. Paulo Justiniano Ribeiro Junior
Tese (doutorado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia Mecânica. Defesa: Curitiba, 23/09/2016
Inclui referências : f. 121-128
Área de concentração : Fenômenos de transporte e mecânica dos sólidos
Resumo: Materiais viscoelásticos têm sido largamente utilizados em métodos passivos de controle de vibrações, devido à sua alta capacidade de dissipação de energia. A realização de projetos eficazes de controle de vibrações usando materiais viscoelásticos requer um conhecimento detalhado do comportamento dinâmico do material empregado. É necessário, em particular, identificar as suas propriedades dinâmicas, representadas pelo módulo real de elasticidade e seu correspondente fator de perda. Estas propriedades são obtidas através de um experimento em uma ampla faixa de temperaturas e frequências, devido à dependência das propriedades destes fatores. Trabalhos anteriores mostram que há uma significativa variabilidade nas propriedades dinâmicas. É proposta, então, abordagem bayesiana para a caracterização das propriedades dinâmicas de materiais viscoelásticos. Os resultados são obtidos de um experimento específico, onde amostras de um dado material foram testadas em diferentes temperaturas e frequências, gerando dados para a análise. O material é modelado, no domínio da frequência, por um modelo de derivada fracionária de quatro parâmetros. A influência da temperatura é considerada com a inclusão de modelos adicionais, a saber, o modelo descrito pela equação empírica de Williams-Landel-Ferry (WLF), com dois parâmetros e o modelo descrito pela equação teórica de Arrhenius, com um parâmetro. Para a análise bayesiana, são utilizadas distribuições a priori adequadas para os parâmetros, junto com a função de verossimilhança correspondente aos modelos empregados de modo a simular a distribuição a posteriori pelo método de Monte Carlo via Cadeias de Markov (MCMC). Após a análise dos diagnósticos de cadeia, para verificar a convergência, os valores simulados são apresentados de forma gráfica. Uma verificação do modelo preditivo também é exposta para comparar os resultados associados com os dados observados. Verifica-se que esta abordagem considera a incerteza do modelo composto fornecendo uma distribuição de probabilidade para cada parâmetro contemplado. Palavras-chave: Inferência Bayesiana. Distribuição de Probabilidade a Posteriori. Controle Passivo de Vibrações. Função de Verossimilhança. Material Viscoelástico.
Abstract: Passive vibration control methods have made large use of viscoelastic materials, due to their high capacity to dissipate energy. The design of efficacious vibration control devices using viscoelastic materials requires detailed knowledge of the corresponding dynamic material behavior. That is, it is essential to identify precisely the dynamic properties, represented by the real modulus of elasticity and the associated loss factor. These properties are obtained by conducting experiments in broad ranges of temperature and frequency since the properties are dependent on these factors. Previous work demonstrated significant variability in the dynamic properties so obtained. This work proposes the use of Bayesian inference approach to characterize the dynamic properties of a typical and well-known viscoelastic material. Results obtained in a specific experiment, where samples from the material were tested at different frequencies and temperatures, generated data for the investigation. The material is initially modeled, in the frequency domain, by the four parameter fractional derivative model. The temperature influence is then considered by introducing additional models, namely the empirical William-Landel-Ferry (WLF) equation, with two parameters, and the theoretical Arrhenius equation, with one parameter. Through the Bayesian approach, adequate prior distributions are used along with a specific likelihood function for the correspondent model. The resulting posterior distributions are obtained with the aid of Monte Carlo Markov Chain (MCMC) methods. After applying diagnostics for checking the convergence of the MCMC, simulated values from the posterior distributions are presented in plots. Posterior predictive checks are carried out to assess the model goodness of fit. This framework describes model uncertainty as expected by providing successfully a probability distribution for each model parameter. Keywords: Bayesian Inference. Posterior Probability Distribution. Passive Vibration Control. Likelihood Function. Viscoelastic Material.
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Nicoletti, Marcos Felipe. "Modelagem não linear mista e método bivariado para sortimento da produção de Pinus taeda L." reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/46455.
Анотація:
Orientador : Prof. Dr. Sebastião do Amaral MachadoCoorientadores : Prof. Dr. Samuel de Pádua Chaves e Carvalho, Prof. Dr. Afonso Figueiredo Filho e Prof. Dr. Carlos Roberto Sanquetta
Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Agrárias, Programa de Pós-Graduação em Engenharia Florestal. Defesa: Curitiba, 06/02/2017
Inclui referências: f. 33-40;86-89;117-118
Área de concentração : Manejo florestal
Resumo: O cenário florestal brasileiro demonstra grande reconhecimento mundial diante das inúmeras vantagens que nosso país apresenta. Algumas empresas florestais possuem sua produção destinada para diversas finalidades, tornando necessária a quantificação da produção de madeira para diferentes finalidades. Esses podem ser matéria prima para laminação, serraria, energia, celulose e papel ou na construção civil. Com isso, visou-se neste trabalho estudar técnicas recentes, ainda pouco desenvolvidas no país de modelagem florestal para descrever o perfil do tronco de Pinus taeda. O trabalho foi dividido em três capítulos, sendo a primeira uma revisão bibliográfica dos fatores que afetam a forma do tronco das árvores, da classificação dos modelos de afilamento e suas aplicações. O segundo capítulo abordou a verificação do modelo logístico não linear e misto de quatro parâmetros para avaliar o perfil do fuste. Realizou-se a comparação do modelo original fixo em relação ao modificado por Carvalho (2014), para estimar as alturas ao longo do tronco, verificou a qualidade da predição para os volumes individuais das árvores; adicionaram-se efeitos aleatórios (idade, sítio e classe diamétrica) no modelo logístico comparando com as estimativas do Polinômio de 5º Grau para a predição do diâmetro ao longo do fuste, do volume da 1ª tora e volumes parciais. A qualidade dos ajustes foi avaliada por meio do Critério de Informação Akaike (AIC), do Critério de Informação Bayesiano (BIC), do Erro Padrão da Estimativa e pela Análise Gráfica do Erro de Predição. Diante dos resultados, o modelo modificado teve melhor desempenho no ajuste em relação ao original. Ao realizar a decomposição dos parâmetros por meio de efeitos aleatórios a predição minimizou em aproximadamente 60% o erro dos ajustes nas estimativas da altura ao longo do tronco. Quando avaliada a predição do volume individual o modelo modificado propiciou uma melhoria de cerca de 70% nos erros. As melhores estimativas do diâmetro ao longo do tronco, do volume da 1ª tora e de volumes parciais foram com o Polinômio de 5º Grau em comparação com o Logístico Modificado Misto com a idade como efeito aleatório. O terceiro capítulo tratou da avaliação do modelo linear bivariado gaussiano fixo e de modelos lineares generalizados mistos para predição do sortimento e na representação do perfil do tronco das árvores. O modelo fixo foi testado na sua forma original e com suas variáveis transformadas. Foram avaliados por meio do AIC, o Índice de Máxima Verossimilhança, Critério de Informação dos Desvios e análise gráfica. Assim, verificou-se que a transformação foi benéfica ao ajuste. Com a predição dos sortimentos verificou-se que a função de densidade probabilística normal padrão gerou estimativas com grande discrepância do aceitável. Para os modelos lineares generalizados mistos, conclui-se que aquele com alteração da distribuição probabilística na variável altura teve melhor representação do tronco. Portanto, as técnicas utilizadas na modelagem mista e multivariada do perfil do tronco demonstraram potencial para gerar estimativas, porém, ainda são necessários novos estudos para o constante aprimôramento. Palavras-chave: Afilamento, Modelos Mistos, Modelo Logístico, Modelo Bivariado Generalizado.
Abstract: The Brazilian forest scenario shows large worldwide recognition on the numerous advantages that our country offers. Some forestry companies have their production intended to various purposes, requiring quantification of wood production for different purposes. These can be raw materials for lamination, sawmill, energy, pulp and paper or construction. Thus, this work aimed to study new forest modeling techniques that are still underdeveloped in the country to describe the tree stem profiles of Pinus taeda. The work was divided in three chapters; the first one is a literature review on the factors that affect the tree stem profiles, the classification of taper models and their applications. The second chapter examined the use of the non-linear logistic mixed model of four parameters to evaluate the trees stem profile. It was compared the fixed original model in relation to the one modified by Carvalho (2014). To estimate the heights along the stem, was check the prediction quality of trees total volumes. Was inserted random effects (age, site and diameter class) in the logistic model comparing with the estimates of the fifth degree polynomials for diameter prediction along the stem, the first log volume and partial volumes. The fitted quality was assessed using the Akaike Information Criterion (AIC), the Bayesian Information Criterion (BIC), the standard error of estimate and the graphical analysis. Considering the results, the modified model presented better performance in fitted than the original. By conducting decomposition of the parameters by random effects the prediction minimized in approximately 60% the fit's errors on the heights estimates along the stem. When evaluated the individual volume prediction the modified model provide an improvement of about 70% of the errors. The best estimates for the diameters along the stem, first log volume and partial volumes were with the fifth degree polynomials in relation to the mixed logistic modified model with age as random effect. The third chapter is the evaluation of the linear bivariate Gaussian fixed model and generalized linear mixed models to assortment prediction and to represent the trees stem profile. The linear bivariate Gaussian fixed model was tested in its original form and with transformed variables. The statistic criteria to assessing the models were the Akaike Information Criterion (AIC), Maximum Likelihood Index (MV), Deviance Information Criterion (DIC) and graphical analysis of the bivariate residuals. Thus, it was found that the transformation was beneficial to the fit. Relating to assortments prediction was found that probabilistic density function normal pattern generated estimates with large discrepancy from the acceptable. For the generalized linear mixed models it is concluded that change the probability distribution in the variable height had better representation of the stem profile. Therefore, the techniques used in the mixed and multivariate modeling of the stem profile showed potential to generate estimates, however, new studies are still needed for constant improvement. Keywords: Taper, Mixed Model, Logistic Model, Generalised Bivariate Model.
Книги з теми "46L55":
1
Whitton, Brian A., and Malcolm Potts, eds. The Ecology of Cyanobacteria. Dordrecht: Kluwer Academic Publishers, 2002. http://dx.doi.org/10.1007/0-306-46855-7.
2
McPhedran, Ross C., Lindsay C. Botten, and Nicolae A. Nicorovici. IUTAM Symposium on Mechanical and Electromagnetic Waves in Structured Media. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-46955-3.
3
Di Benedetto, Hervé, Hassan Baaj, Emmanuel Chailleux, Gabriele Tebaldi, Cédric Sauzéat, and Salvatore Mangiafico, eds. Proceedings of the RILEM International Symposium on Bituminous Materials. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-46455-4.
4
Günay, Cengiz, and Nina Witjes, eds. Border Politics. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-46855-6.
5
Lunau, Stephan, ed. Six Sigma+Lean Toolset. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-46055-8.
6
Bachem, Achim, Ulrich Derigs, Michael Jünger, and Rainer Schrader, eds. Operations Research ’93. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8.
7
Fritz, Alfred Herbert. Fertigungstechnik. Edited by Günter Schulze. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46555-4.
8
Peng, Zhilong. Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46955-2.
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Sambursky, Shmuel. Proklos, Präsident der platonischen Akademie, und sein Nachfolger, der Samaritaner Marinos. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-46555-0.
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Esteban, Joan. The Social Viability of Money. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-46755-4.
Частини книг з теми "46L55":
1
Gadot, F., E. Akmansoy, T. Brillat, A. de Lustrac, and J. M. Lourtioz. "Band Gap Engineering in Metallic PBG Materials at Microwave Frequencies using Composite Material and Defect Lattice." In IUTAM Symposium on Mechanical and Electromagnetic Waves in Structured Media, 257–68. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/0-306-46955-3_20.
2
Botten, L. C., C. M. de Sterke, R. C. McPhedran, N. A. Nicorovici, A. A. Asatryan, and P. A. Robinson. "General Characteristics of Localization in Stratified Media with Random Loss and Gain." In IUTAM Symposium on Mechanical and Electromagnetic Waves in Structured Media, 297–310. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/0-306-46955-3_23.
3
Achatz, Hans. "The Scheduling Problem in High-Level Synthesis: Extended 0/1 LP Model and Solution Methods." In Operations Research ’93, 1–4. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_1.
4
Bendisch, Jürgen, Ulrich Derigs, and Achim Metz. "Groundstates in Ising Spin Lattices by Optimal Matchings." In Operations Research ’93, 36–39. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_10.
5
Radzik, Tadeusz. "Convexity-Concavity: Matrices and Matrix Games." In Operations Research ’93, 408–11. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_100.
6
Ramalhoto, M. F., and A. Pacheco. "Generalizations of Erlang Formulae and Some of Their 2nd Order Properties." In Operations Research ’93, 412–17. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_101.
7
Reimer, Matthias, and Klaus Sandmann. "An Efficient Approach for Down-and-out-Calls in a Binomial Model." In Operations Research ’93, 418–21. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_102.
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Robič, Borut. "Horizontal Stretching in the Mapping of Algorithms onto a Data-driven Array." In Operations Research ’93, 422–24. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_103.
9
Roemen, J. "An optimal marketing strategy for heterogeneous groups of porkers." In Operations Research ’93, 425–27. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_104.
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Rustem, Berç. "A Discrete Min-Max Algorithm for Inequality Constraints." In Operations Research ’93, 428–29. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-46955-8_105.
Тези доповідей конференцій з теми "46L55":
1
Shang, Chaowei, Hongyu Zhou, and Shile Huang. "Abstract 4655: Iron chelation inhibits mTORC1 signaling in tumor cells." In Proceedings: AACR 107th Annual Meeting 2016; April 16-20, 2016; New Orleans, LA. American Association for Cancer Research, 2016. http://dx.doi.org/10.1158/1538-7445.am2016-4655.
2
Srinivasan, Sangeetha, Filemon Dela Cruz, Andrew Kung, Ervin Gaviria, Ethan Miller, Nathan Yee, Maksim Royzen, and Jose Mejia-Oneto. "Abstract 4655: Local drug activation: Making cytotoxics safer for local tumors." In Proceedings: AACR Annual Meeting 2018; April 14-18, 2018; Chicago, IL. American Association for Cancer Research, 2018. http://dx.doi.org/10.1158/1538-7445.am2018-4655.
3
Abrahamsen, Mikkel. "Spiral Toolpaths for High-Speed Machining of 2D Pockets With or Without Islands." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46255.
Анотація:
We describe new methods for the construction of spiral toolpaths for high-speed machining. In the simplest case, our method takes a polygon as input and a number δ > 0 and returns a spiral starting at a central point in the polygon, going around towards the boundary while morphing to the shape of the polygon. The spiral consists of linear segments and circular arcs, it is G1 continuous, it has no self-intersections, and the distance from each point on the spiral to each of the neighboring revolutions is at most δ. Our method has the advantage over previously described methods that it is easily adjustable to the case where there is an island in the polygon to be avoided by the spiral. In that case, the spiral starts at the island and morphs the island to the outer boundary of the polygon. It is shown how to apply that method to make significantly shorter spirals in polygons with no islands than what is obtained by conventional spiral toolpaths. Finally, we show how to make a spiral in a polygon with multiple islands by connecting the islands into one island.
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Steuben, John, Douglas L. Van Bossuyt, and Cameron Turner. "Design for Fused Filament Fabrication Additive Manufacturing." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46355.
Анотація:
In this paper, we explore the topic of Fused Filament Fabrication (FFF) 3D-printing. This is a low-cost additive manufacturing technology which is typically embodied in consumer-grade desktop 3D printers capable of producing useful parts, structures, and mechanical assemblies. The primary goal of our investigation is to produce an understanding of this process which can be employed to produce high-quality, functional engineered parts and prototypes. By developing this understanding, we create a resource which may be turned to by both researchers in the field of manufacturing science, and industrial professionals who are either considering the use of FFF-enabled technologies such as 3D printing, or those who have already entered production and are optimizing their fabrication process. In order to paint a cohesive picture for these readers, we examine several topic areas. We begin with an overview of the FFF process, its key hardware and software components, and the interrelationships between these components and the designer. With this basis, we then proceed to outline a set of design principles which facilitate the production of high quality printed parts, and discuss the selection of appropriate materials. Following naturally from this, we turn to the question of feedstock materials for FFF, and give advice for their selection and use. We then turn to the subject of the as-printed properties of FFF parts and the strong non-isotropic response that they exhibit. We discuss the root causes of this behavior and means by which its deleterious effects may be mitigated. We conclude by discussing a mixed numerical/experimental technique which we believe will enable the accurate characterization of FFF parts and structures, and greatly enhance the utility of this additive manufacturing technology. By formalizing and discussing these topics, we hope to motivate and enable the serious use of low-cost FFF 3D printing for both research and industrial applications.
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Hoursan, Hesam, and Mohammad Taghi Ahmadian. "Dynamic Behaviour of Ox Tibial and Femoral Bones: A Comparison With Human Bones." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46555.
Анотація:
Finite element models have been widely employed in an effort to quantify the stress and strain distribution around human bones as well as implanted prostheses and to explore the influence of these distributions on their long-term stability. In order to provide meaningful predictions, such models must contain an appropriate reflection of mechanical properties. Detailed geometrical and density information is now readily available from CT scanning. However, there are still many complications regarding patient-specific geometrical differences and bone dynamic behavior in-vivo. Experimental studies on animal bones, due to their convenience and accessibility, have always played a key role in simulating human bone behavior. In current study, a modal experiment has been done on an ox femoral and tibial bones and the results have been compared with those reported from human bones. Results have been obtained in terms of natural frequencies of medio-lateral bending mode shapes and damping ratios, and compared with those obtained by some previous studies. The results suggest similar pattern in modal behavior, but considerable difference between natural frequencies due to geometrical differences. To consider structural damping ratios, due to existence of moisture and marrow in bone in-vivo, samples have been obtained few hours post-mortem and the ratio has been extracted for each natural frequency. Finally, conclusions have been made on the similarity of the models and how to improve the FE models of human tibial and femoral components.
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Rone, William S., and Pinhas Ben-Tzvi. "Static Modeling of a Multi-Segment Serpentine Robotic Tail." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46655.
Анотація:
This paper presents a generalized method of determining the static shape conformation of a cable-driven serpentine robot. Given a set of desired cable displacements as model inputs, the model calculates the joint angles and cable tensions that result from those displacements. The model’s governing equations are derived from ensuring static equilibrium at each of the robot’s revolute joints, along with compatibility equations ensuring the joint angles result in the desired cable displacements. Elastic, actuation and gravitational loading are included in the model, and the results analyze the relative impact of each for various combinations of cable displacement inputs. In addition, the impact of elasticity and mass distribution on the accuracy of purely kinematic constant-curvature segment models is presented. In addition, the model also accommodates limits for the serpentine joint angles. The model is implemented in MATLAB, and results are generated to analyze the impact of the actuation, elastic and gravitational effects. Future work will include inertial effects in the model to make it dynamic. These models will be used as the foundation for a serpentine tail design for use on-board a mobile robot, and for task planning to enable that tail to be effectively used in various scenarios.
7
Sheffer, Avshalom, and Offer Shai. "Combinatorial Method for Characterizing Singular Configurations in Parallel Mechanisms." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46755.
Анотація:
The paper presents a method for finding the different singular configurations of several types of parallel mechanisms/robots using the combinatorial method. The main topics of the combinatorial method being used are: equimomental line/screw, self-stresses, Dual Kennedy theorem and circle, and various types of 2D and 3D Assur Graphs such as: triad, tetrad and double triad. The paper introduces combinatorial characterization of 3/6 SP and compares it to singularity analysis of 3/6 SP using Grassmann Line Geometry and Grassmann-Cayley Algebra. Finally, the proposed method is applied for characterizing the singular configurations of more complex parallel mechanisms such as 3D tetrad and 3D double-triad.
8
Saadatnia, Zia, and Ebrahim Esmailzadeh. "Nonlinear Forced Vibration Analysis of a Non-Local Carbon Nanotube Carrying Intermediate Mass." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46855.
Анотація:
The aim of this study is to model and investigate the nonlinear transversal vibration of a carbon nanotube carrying an intermediate mass along the structure considering the nonlocal and non-classical theories. Due to the application of the proposed system in sensors, actuators, mass detection units among others, the analysis of forced vibration of such systems is of an important task being considered here. The governing equation of motion is developed by combining the Euler-Bernoulli beam theory and the Eringen non-local theory. The Galerkin approach is employed to obtain the governing differential equation of the system and the transient beam response for the clamped-hinged boundary condition. A strong perturbation method is utilized to solve the equation obtained and the system responses subjected to a harmonic excitation is examined. The steady-state motion is studied and the frequency response in an analytical form is obtained. Finally, results are evaluated for some numerical parameter values and their effect on the frequency responses are presented and fully discussed.
9
Xu, Chao, Shuming Gao, and Ming Li. "Heterogeneous Material Design Using a PCA-Based Microstructure Representing Method." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46955.
Анотація:
A PCA (Principle Component Analysis)-based microstructure descriptor is proposed in this paper. The PCA process is performed on the microstructures of the material database, and is able to maintain the dominant geometric features using a small number of PCA basis. Moreover, this PCA-based descriptor also gives a closed-form expression between the microstructures within the design space and their physical properties. Previous approaches, for example, based on meta-modeling, involve much more expensive off-line finite element computations. Using this novel PCA-based descriptor, an approach to design a microstructure of optimal physical performance is proposed, taking the concrete case of linear elasticity analysis for demonstration.
10
Wang, Zhan, Jian-Jun Liu, Bai-tao An, and Chao Zhang. "Effects of Axial Row-Spacing for Double-Jet Film-Cooling on the Cooling Effectiveness." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46055.
Анотація:
The effects of axial row-spacing for double jet film-cooling (DJFC) with compound angle on the cooling characteristics under different blowing ratios were investigated numerically. First, the flow fields and cooling effectiveness of DJFC on flat plate with different axial row-spacing were calculated. Film-cooling with fan-shaped or cylindrical holes was also calculated for the comparison. The results indicate that a larger axial row-spacing is helpful to form the anti-kidney vortex and to improve the cooling effectiveness. The DJFC was then applied to the suction and pressure surface of a real turbine inlet guide vane. Comparisons of film-cooling effectiveness with the cylindrical and fan-shaped holes were also conducted. The results for the guide vane show that on the suction surface the DJFC with a larger axial row-spacing leads to better film coverage and better film-cooling effectiveness than the cylindrical or fan-shaped holes. On the pressure surface, however, the film-cooling with fan-shaped holes is superior to the others.