Готові списки джерел за темами / Spherical part

Добірка наукової літератури з теми "Spherical part"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Spherical part"

1

Papadakis, Stavros Argyrios, and Bart Van Steirteghem. "Equivariant Degenerations of Spherical Modules: Part II." Algebras and Representation Theory 19, no. 5 (May 12, 2016): 1135–71. http://dx.doi.org/10.1007/s10468-016-9614-7.

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2

Boardman, Richard P., Hans Fangohr, Simon J. Cox, Alexander V. Goncharov, Alexander A. Zhukov, and Peter A. J. de Groot. "Micromagnetic simulation of ferromagnetic part-spherical particles." Journal of Applied Physics 95, no. 11 (June 2004): 7037–39. http://dx.doi.org/10.1063/1.1688639.

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3

Schapery, R. A. "Elastomeric bearing sizing analysis Part 1: Spherical bearing." International Journal of Solids and Structures 152-153 (November 2018): 118–39. http://dx.doi.org/10.1016/j.ijsolstr.2018.03.010.

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4

Lombardini, M., D. I. Pullin, and D. I. Meiron. "Turbulent mixing driven by spherical implosions. Part 2. Turbulence statistics." Journal of Fluid Mechanics 748 (April 28, 2014): 113–42. http://dx.doi.org/10.1017/jfm.2014.163.

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AbstractWe present large-eddy simulations (LES) of turbulent mixing at a perturbed, spherical interface separating two fluids of differing densities and subsequently impacted by a spherically imploding shock wave. This paper focuses on the differences between two fundamental configurations, keeping fixed the initial shock Mach number $\approx $1.2, the density ratio (precisely $|A_0|\approx 0.67$) and the perturbation shape (dominant spherical wavenumber $\ell _0=40$ and amplitude-to-initial radius of 3 %): the incident shock travels from the lighter fluid to the heavy one, or inversely, from the heavy to the light fluid. In Part 1 (Lombardini, M., Pullin, D. I. & Meiron, D. I., J. Fluid Mech., vol. 748, 2014, pp. 85–112), we described the computational problem and presented results on the radially symmetric flow, the mean flow, and the growth of the mixing layer. In particular, it was shown that both configurations reach similar convergence ratios $\approx $2. Here, turbulent mixing is studied through various turbulence statistics. The mixing activity is first measured through two mixing parameters, the mixing fraction parameter $\varTheta $ and the effective Atwood ratio $A_e$, which reach similar late time values in both light–heavy and heavy–light configurations. The Taylor-scale Reynolds numbers attained at late times are estimated at approximately 2000 in the light–heavy case and 1000 in the heavy–light case. An analysis of the density self-correlation $b$, a fundamental quantity in the study of variable-density turbulence, shows asymmetries in the mixing layer and non-Boussinesq effects generally observed in high-Reynolds-number Rayleigh–Taylor (RT) turbulence. These traits are more pronounced in the light–heavy mixing layer, as a result of its flow history, in particular because of RT-unstable phases (see Part 1). Another measure distinguishing light–heavy from heavy–light mixing is the velocity-to-scalar Taylor microscales ratio. In particular, at late times, larger values of this ratio are reported in the heavy–light case. The late-time mixing displays the traits some of the traits of the decaying turbulence observed in planar Richtmyer–Meshkov (RM) flows. Only partial isotropization of the flow (in the sense of turbulent kinetic energy (TKE) and dissipation) is observed at late times, the Reynolds normal stresses (and, thus, the directional Taylor microscales) being anisotropic while the directional Kolmogorov microscales approach isotropy. A spectral analysis is developed for the general study of statistically isotropic turbulent fields on a spherical surface, and applied to the present flow. The resulting angular power spectra show the development of an inertial subrange approaching a Kolmogorov-like $-5/3$ power law at high wavenumbers, similarly to the scaling obtained in planar geometry. It confirms the findings of Thomas & Kares (Phys. Rev. Lett., vol. 109, 2012, 075004) at higher convergence ratios and indicates that the turbulent scales do not seem to feel the effect of the spherical mixing-layer curvature.
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5

ONODA, Yui, and Ayaka SHIMIZU. "The Reductivity of Spherical Curves Part II: 4-gons." Tokyo Journal of Mathematics 41, no. 1 (June 2018): 51–63. http://dx.doi.org/10.3836/tjm/1502179266.

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6

Yamaguchi, H., and B. Nishiguchi. "Spherical Couette flow of a viscoelastic fluid – Part III." Journal of Non-Newtonian Fluid Mechanics 84, no. 1 (July 1999): 45–64. http://dx.doi.org/10.1016/s0377-0257(98)00143-8.

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Dincer, Ibrahim, and Osman F. Genceli. "Cooling of spherical products: Part I—effective process parameters." International Journal of Energy Research 19, no. 3 (April 1995): 205–18. http://dx.doi.org/10.1002/er.4440190304.

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Dincer, Ibrahim, and Osman F. Genceli. "Cooling of spherical products: Part II—heat transfer parameters." International Journal of Energy Research 19, no. 3 (April 1995): 219–25. http://dx.doi.org/10.1002/er.4440190305.

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9

Bostwick, J. B., and P. H. Steen. "Coupled oscillations of deformable spherical-cap droplets. Part 1. Inviscid motions." Journal of Fluid Mechanics 714 (January 2, 2013): 312–35. http://dx.doi.org/10.1017/jfm.2012.483.

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AbstractA spherical drop is constrained by a solid support arranged as a latitudinal belt. This belt support splits the drop into two deformable spherical caps. The edges of the support are given by lower and upper latitudes yielding a ‘spherical belt’ of prescribed extent and position: a two-parameter family of constraints. This is a belt-constrained Rayleigh drop. In this paper we study the linear oscillations of the two coupled spherical-cap surfaces in the inviscid case, and the viscous case is studied in Part 2 (Bostwick & Steen, J. Fluid Mech., vol. 714, 2013, pp. 336–360), restricting to deformations symmetric about the axis of constraint symmetry. The integro-differential boundary-value problem governing the interface deformation is formulated as a functional eigenvalue problem on linear operators and reduced to a truncated set of algebraic equations using a Rayleigh–Ritz procedure on a constrained function space. This formalism allows mode shapes with different contact angles at the edges of the solid support, as observed in experiment, and readily generalizes to accommodate viscous motions (Part 2). Eigenvalues are mapped in the plane of constraints to reveal where near-multiplicities occur. The full problem is then approximated as two coupled harmonic oscillators by introducing a volume-exchange constraint. The approximation yields eigenvalue crossings and allows post-identification of mass and spring constants for the oscillators.
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10

Willis, D. M., J. Robin Singh, and J. Comer. "Uncertainties in field-line tracing in the magnetosphere. Part I: the axisymmetric part of the internal geomagnetic field." Annales Geophysicae 15, no. 2 (February 28, 1997): 165–80. http://dx.doi.org/10.1007/s00585-997-0165-4.

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Abstract. The technique of tracing along magnetic field lines is widely used in magnetospheric physics to provide a "magnetic frame of reference'' that facilitates both the planning of experiments and the interpretation of observations. The precision of any such magnetic frame of reference depends critically on the accurate representation of the various sources of magnetic field in the magnetosphere. In order to consider this important problem systematically, a study is initiated to estimate first the uncertainties in magnetic-field-line tracing in the magnetosphere that arise solely from the published (standard) errors in the specification of the geomagnetic field of internal origin. Because of the complexity in computing these uncertainties for the complete geomagnetic field of internal origin, attention is focused in this preliminary paper on the uncertainties in magnetic-field-line tracing that result from the standard errors in just the axisymmetric part of the internal geomagnetic field. An exact analytic equation exists for the magnetic field lines of an arbitrary linear combination of axisymmetric multipoles. This equation is used to derive numerical estimates of the uncertainties in magnetic-field-line tracing that are due to the published standard errors in the axisymmetric spherical harmonic coefficients (i.e. gn0 ± δgn0). Numerical results determined from the analytic equation are compared with computational results based on stepwise numerical integration along magnetic field lines. Excellent agreement is obtained between the analytical and computational methods in the axisymmetric case, which provides great confidence in the accuracy of the computer program used for stepwise numerical integration along magnetic field lines. This computer program is then used in the following paper to estimate the uncertainties in magnetic-field-line tracing in the magnetosphere that arise from the published standard errors in the full set of spherical harmonic coefficients, which define the complete (non-axisymmetric) geomagnetic field of internal origin. Numerical estimates of the uncertainties in magnetic-field-line tracing in the magnetosphere, calculated here for the axisymmetric part of the internal geomagnetic field, should be regarded as "first approximations'' in the sense that such estimates are only as accurate as the published standard errors in the set of axisymmetric spherical harmonic coefficients. However, all procedures developed in this preliminary paper can be applied to the derivation of more realistic estimates of the uncertainties in magnetic-field-line tracing in the magnetosphere, following further progress in the determination of more accurate standard errors in the spherical harmonic coefficients.
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Більше джерел

Дисертації з теми "Spherical part"

1

Dogurevich, Pavel. "Kinetic simulation of spherically symmetric collisionless plasma in the inner part of a cometary coma." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-389449.

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2

Мельник, Вадим Петрович. "Комп’ютерне моделювання мікроциркуляції крові в організмі людини". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/25882.

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Магістерська дисертація складається із пояснювальної записки обсягом 90 сторінок та включає 17 ілюстрацій, 16 таблиць, 28 посилань, 2 додатки. Актуальність теми. Сучасна діагностична медицина потребує нових неінвазивних методів дослідження кровотоку. Одним із таких методів є мікроциркуляція крові у організмі людини, що дозволяє отримати дані про швидкість кров’яного току, а знаючи параметри судин, по яким здійснюється рух можна судити про патологічні зміни в них. Метою магістерської дисертації є розрахунок параметрів і характеристик комп’ютерної моделі мікроциркуляції крові. Об’єктом дослідження є модель мікроциркуляції крові в організмі людини. Предметом дослідження є параметри і характеристики мікроциркуляції. крові. Наукова новизна полягає у використанні теорії Мі для сферичних частинок для моделюваня розсіюваного випромінювання від кровотворчих елементів. Практичне значення одержаних результатів. Розроблена модель дозволяє у значній мірі пришвидшити діагносування патологічних змін у крові та судинах організму людини.
Actuality of theme. Modern diagnostive medicine desperately needs new noninvasive methods of blood flow research. One of the most perspective is the microcirculation of blood in the human body, which allows you to get data on the rate of blood flow, and knowing the parameters of the vessels, which is the movement, from that could be judged about pathological changes in them. The purpose of the master's thesis is calculation of the parameters and characteristics of the computer model of microcirculation of blood. The object of the study is the model of microcirculation in the human body. The subject of the study is the parameters and characteristics of the blood microcirculationtion. The scientific novelty is the application of the Mie theory for spherical parts to simulate the scattering of radiation from the blood-forming elements. The practical value of the results. The developed model allows to greatly accelerate the diagnosis of pathological changes in the blood and blood vessels of the human body.
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Caires, Fernando Ribeiro. "Estudos e desenvolvimento de métodos baseados em harmônicos esféricos para análise de similaridade estrutural entre ligantes." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-05012017-151212/.

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Анотація:
Descritores moleculares são essenciais em muitas aplicações de física e química computacional, como na análise de similaridade entre ligantes baseada em sua estrutura. Harmônicos esféricos têm sido utilizados como descritores da superfície molecular por serem uma forma compacta de descrição geométrica e por possuírem um descritor invariante por rotação. Assim, este trabalho propõe um método de análise de similaridade estrutural entre ligantes no qual se modela a superfície de uma molécula através de uma expansão em harmônicos esféricos realizada pelo programa LIRA. Os coeficientes encontrados são utilizados para percorrer o banco de dados DUD-E, com descritores previamente calculados, utilizando Distância Euclidiana e diversos valores de corte para selecionar compostos mais semelhantes. O potencial do método é avaliado usando o Ultrafast Shape Recognition (USR) como método padrão, pelo fato de ser uma excelente e rápida métrica para análise da similaridade de ligantes. Foram selecionadas 50 moléculas de diferentes tamanhos e composição de forma a representar todos os grupos moleculares presentes na DUD-E. Em seguida, cada molécula foi submetida à busca de similares variando-se valores de corte para o LIRA em que o conjunto de moléculas selecionadas foi comparado com as selecionadas pelo USR através de um processo de classificação binária e criação e interpretação de curvas ROC. Além do benchmarking, foi realizada a análise das componentes principais para determinar quais descritores são os mais importantes e carregam as melhores informações utilizadas na descrição da superfície da molécula. A partir das componentes principais, foi realizado um estudo do uso de funções peso, associando mais importância aos descritores adequados, e a redução da dimensionalidade do banco de dados, seleção de um novo conjunto de autovetores que formam as bases do espaço vetorial e uma nova descrição das moléculas para o novo espaço, no qual cada variação foi avaliada através de um novo benchmarking. O LIRA se mostrou tão rápido quanto o USR e apresentou grande potencial de seleção de moléculas similares, para a maioria das moléculas testadas, pois as curvas ROC apresentaram pontos acima da linha do aleatório. Tanto a redução da dimensionalidade quanto o uso de funções de ponderação agregaram valor à métrica deixando-a mais veloz, no caso da redução da quantidade de descritores, e seletiva, em ambos os casos. Dessa forma, o método proposto se mostrou eficiente em mensurar a similaridade entre ligantes de forma seletiva e rápida utilizando somente informações a respeito da superfície molecular.
Molecular descriptors are essential for many applications in computational chemistry and physics, such as ligand-based similarity searching. Spherical harmonics have previously been suggested as comprehensive descriptors of molecular structure due to their properties, orthonormality and rotationally invariant. Here we proposed a ligand similarity analysis method where molecule\'s surface is modeled by an expansion in Spherical Harmonics, called LIRA, whose coefficient are used to perform a search in DUD-E database, with all descriptors previously calculated, measured by Euclidian Distance and different cutoff\'s values to select similar compounds. Method\'s potential is evaluated against Ultrafast Shape Recognition (USR), due to it is an excellent a fast metric to ligand similarity analysis, in a benchmarking. Fifty molecules are selected varying chemical composition and size to represent all molecular groups of DUD-E. After that, which one was submitted in a search with different values of cutoff for LIRA and the subset selected was compared with the ones selected by USR through binary classification and ROC curves analysis. Beyond benchmarking, it was performed a principal component analysis to identify which are the most valuable coefficient for shape description. Using principal components two other studies are made, weight functions are applied to descriptors, providing more value for those carry more information, and dimensionality reduction, where a subset of eigenvectors are select to form the new basis of the vector space and the new molecule\'s description was made in the new space, which variation was tested in a new benchmarking. Lira showed to be as fast as USR and a big potential to select similar molecules, for the majority of the molecules tested, because ROC curves had points over the random line. Dimensionality reduction and weight functions improved LIRA results raising velocity, due to the use of less descriptors to model molecule\'s surface, and the selection power, for both cases. In summary, the proposed method showed to be an efficient and fast tool for measure similarity between ligands based in molecular shape.
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FERNANDES, ALMIR. "Estudo de um metodo para solucao da equacao de transporte monoenergetica e em geometria tridimensional pelo metodo de elementos finitos e pela." reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10256.

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Анотація:
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Santos, Marjory Del Vecchio dos. "Teorema de Borsuk-Ulam para formas espaciais esféricas." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-26092014-141506/.

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O objetivo principal deste trabalho é apresentar um estudo sobre o Teorema de Borsuk-Ulam para forma espacial esférica homotópica. Em nosso trabalho consideramos X uma n-forma espacial esférica homotópica a qual admite uma ação livre de Zp, com p> 2 primo e f : X → Rk uma função contínua e, mostramos que sob determinada relação entre os números n e k, o conjunto A(f) dos pontos de coincidência de f é não vazio
The main objective of this work is to present a study about the Borsuk- Ulam Theorem for homotopic spherical space. In our work we consider X be a n-dimensional homotopic spherical space form which admits a free action of Zp, with p> 2 prime and f : X → Rk be a continuous map and we show that, under certain relations between the numbers n and k, the set A(f) is not empty
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Machado, Fabrício Caluza. "Limitantes de programação semidefinida para o número de contato." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-17052017-225346/.

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O número de contato do Rn (em inglês, kissing number) é o maior número de esferas de raio unitário e interiores dois-a-dois disjuntos que podem tocar simultaneamente uma esfera de raio unitário central. Nesta dissertação estudamos métodos que limitam o tamanho de tais configurações através de técnicas de otimização, como dualidade e programação semidefinida. O principal resultado obtido foi o cálculo de melhores limitantes para o número de contato nas dimensões 9 a 23; o que foi possível graças à exploração de simetrias dos polinômios presentes no limitante proposto por Bachoc e Vallentin (2008), levando à consideração de programas semidefinidos menores. Por fim, o limitante estudado é estendido para uma classe mais geral de problemas.
The kissing number of Rn is the maximum number of pairwise-nonoverlapping unit spheres that can simultaneously touch a central unit sphere. In this thesis we study methods to bound from above the size of such configurations using optimization techniques, like duality and semidefinite programming. The main result achieved is the computation of better bounds for the kissing number in dimensions 9 to 23; a result possible due to the exploitation of symmetries in the polynomials present in the bound proposed by Bachoc and Vallentin (2008), leading to the consideration of smaller semidefinite programs. Finally, the studied bound is extended to a bigger class of problems.
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Basso, Glaucia Grazielli [UNESP]. "Síntese e caracterização de partículas esféricas de poli(álcool vinílico) e poli(acetato vinílico) para utilização em embolização." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/87503.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Financiadora de Estudos e Projetos (FINEP)
Partículas poliméricas com tamanho e morfologia controlados e propriedades físico-químicas adequadas são amplamente utilizadas em aplicações médicas, como na embolização, uma técnica cirúrgica utilizada para tratar malformações arteriovenosas (MAVs), conter hemorragias, tratar localmente tumores hipervascularizados (THVs) e outras doenças vasculares. Este procedimento é realizado com materiais de diferentes formas e composições, sendo as partículas de poli(álcool vinílico) (PVA) freqüentemente utilizadas por apresentarem um alto grau de desempenho. Elas estão disponíveis no mercado nas morfologias esférica e não-esférica, sendo que as esféricas apresentam uma maior eficácia no tratamento. O presente trabalho objetivou desenvolver e aprimorar partículas esféricas de PVA e poli(acetato vinílico) (PVAc) para serem utilizadas em embolização. Suas sínteses foram realizadas em duas etapas: a polimerização em suspensão do monômero acetato vinílico (VAc) em PVAc e a saponificação do polímero PVAc em PVA, com variações na velocidade de agitação e na concentração da solução de hidróxido de sódio (NaOH), na etapa da saponificação. As partículas foram caracterizadas por microscopia eletrônica de varredura (MEV), difração de raios-X (DRX), calorimetria diferencial de varredura (DSC) e ressonância magnética nuclear de 13 C - cross polarization / magic angle spinning (13 C RMN CP/MAS). Foram analisadas a distribuição de tamanhos, a dimensão fractal, a determinação da biocarga, que determinou os parâmetros de esterilização por radiação gama, e a citotoxicidade, pelo teste de “Reatividade Biológica in vitro”. Os resultados indicaram que a morfologia esférica foi obtida durante a primeira etapa da síntese e que essa morfologia não foi afetada pelo segundo processo. A velocidade de agitação e a concentração de NaOH influenciaram...
Polymeric particles with controlled size and morphology and appropriated physicochemical properties are widely used in medical applications, such as embolization, a surgical technique used to treat arteriovenous malformations (AVMs), stop bleedings, treat locally hypervascular tumors (HVTs) and other vascular diseases. This procedure is performed with materials of different shapes and compositions, and the poly(vinyl alcohol) (PVA) particles are often used for presenting a high degree of performance. They are commercially available in spherical and non-spherical morphologies, and the spherical particles have a greater efficacy in the treatment. This study aimed to develop and improve spherical PVA and poly(vinyl acetate) (PVAc) particles for use in embolization. Their syntheses were performed in two stages: the suspension polymerization of vinyl acetate (VAc) monomer in PVAc and the saponification of PVAc polymer in PVA, with variations in the stirring speed and the concentration of sodium hydroxide (NaOH) solution, at the saponification step. The particles were characterized by scanning electronic microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and 13 C nuclear magnetic resonance - cross polarization / magic angle spinning (13 C NMR CP/MAS). We analyzed the size distribution, the fractal dimension, the determining of the bioburden, which determined the parameters of sterilization by gamma irradiation, and the cytotoxicity, by the “Biological Reactivity in vitro”. The results indicated that the spherical morphology was obtained during the first stage of the synthesis and that this morphology was not affected by the second process. The stirring speed and the NaOH concentration influenced the size of the particles. The commercial particles have a fractal dimension greater than the synthesized particles... (Complete abstract click electronic access below)
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DIAS, ARTUR F. "Metodo PsubN para calculos de blindagem em geometria de multiplacas." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10771.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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9

Basso, Glaucia Grazielli. "Síntese e caracterização de partículas esféricas de poli(álcool vinílico) e poli(acetato vinílico) para utilização em embolização /." São José do Rio Preto : [s.n.], 2011. http://hdl.handle.net/11449/87503.

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Resumo: Partículas poliméricas com tamanho e morfologia controlados e propriedades físico-químicas adequadas são amplamente utilizadas em aplicações médicas, como na embolização, uma técnica cirúrgica utilizada para tratar malformações arteriovenosas (MAVs), conter hemorragias, tratar localmente tumores hipervascularizados (THVs) e outras doenças vasculares. Este procedimento é realizado com materiais de diferentes formas e composições, sendo as partículas de poli(álcool vinílico) (PVA) freqüentemente utilizadas por apresentarem um alto grau de desempenho. Elas estão disponíveis no mercado nas morfologias esférica e não-esférica, sendo que as esféricas apresentam uma maior eficácia no tratamento. O presente trabalho objetivou desenvolver e aprimorar partículas esféricas de PVA e poli(acetato vinílico) (PVAc) para serem utilizadas em embolização. Suas sínteses foram realizadas em duas etapas: a polimerização em suspensão do monômero acetato vinílico (VAc) em PVAc e a saponificação do polímero PVAc em PVA, com variações na velocidade de agitação e na concentração da solução de hidróxido de sódio (NaOH), na etapa da saponificação. As partículas foram caracterizadas por microscopia eletrônica de varredura (MEV), difração de raios-X (DRX), calorimetria diferencial de varredura (DSC) e ressonância magnética nuclear de 13 C - cross polarization / magic angle spinning (13 C RMN CP/MAS). Foram analisadas a distribuição de tamanhos, a dimensão fractal, a determinação da biocarga, que determinou os parâmetros de esterilização por radiação gama, e a citotoxicidade, pelo teste de "Reatividade Biológica in vitro". Os resultados indicaram que a morfologia esférica foi obtida durante a primeira etapa da síntese e que essa morfologia não foi afetada pelo segundo processo. A velocidade de agitação e a concentração de NaOH influenciaram... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Polymeric particles with controlled size and morphology and appropriated physicochemical properties are widely used in medical applications, such as embolization, a surgical technique used to treat arteriovenous malformations (AVMs), stop bleedings, treat locally hypervascular tumors (HVTs) and other vascular diseases. This procedure is performed with materials of different shapes and compositions, and the poly(vinyl alcohol) (PVA) particles are often used for presenting a high degree of performance. They are commercially available in spherical and non-spherical morphologies, and the spherical particles have a greater efficacy in the treatment. This study aimed to develop and improve spherical PVA and poly(vinyl acetate) (PVAc) particles for use in embolization. Their syntheses were performed in two stages: the suspension polymerization of vinyl acetate (VAc) monomer in PVAc and the saponification of PVAc polymer in PVA, with variations in the stirring speed and the concentration of sodium hydroxide (NaOH) solution, at the saponification step. The particles were characterized by scanning electronic microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and 13 C nuclear magnetic resonance - cross polarization / magic angle spinning (13 C NMR CP/MAS). We analyzed the size distribution, the fractal dimension, the determining of the bioburden, which determined the parameters of sterilization by gamma irradiation, and the cytotoxicity, by the "Biological Reactivity in vitro". The results indicated that the spherical morphology was obtained during the first stage of the synthesis and that this morphology was not affected by the second process. The stirring speed and the NaOH concentration influenced the size of the particles. The commercial particles have a fractal dimension greater than the synthesized particles... (Complete abstract click electronic access below)
Orientador: José Geraldo Nery
Coorientador: Ana Paula Marques de Lima Oliveira
Banca: Rosa Sayoko Kawasaki Oyama
Banca: Moacir Fernandes de Godoy
Mestre
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10

GALEGO, EGUIBERTO. "Desenvolvimento de programa computacional para tratamentos de dados de textura obtidos pela tecnica de difracao de raios x." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11168.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Книги з теми "Spherical part"

1

Series, Michigan Historical Reprint. A treatise on special or elementary geometry. In four parts. Including plane, solid, and spherical geometry, and plane and spherical trigonometry, with ... tables. Part III ... By Edward Olney. Scholarly Publishing Office, University of Michigan Library, 2005.

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2

Wittman, David M. General Relativity and the Schwarzschild Metric. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199658633.003.0018.

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Previously, we saw that variations in the time part of the spacetime metric cause free particles to accelerate, thus unifying gravity and relativity; and that orbits trace those accelerations, which follow the inverse‐square law around spherical source masses. But a metric that empirically models orbits is not enough; we want to understand how any arrangement of mass determines the metric in the surrounding spacetime. This chapter describes thinking tools, especially the frame‐independent idea of spacetime curvature, that helped Einstein develop general relativity. We describe the Einstein equation, which determines the metric given a source or set of sources. Solving that equation for the case of a static spherical mass (such as the Sun) yields the Schwarzschild metric. We compare Schwarzschild and Newtonian predictions for precession, the deflection of light, and time delay of light; and we contrast the effects of variations in the time and space parts of the metric.
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3

Chemin, Jean-Yves, Benoit Desjardins, Isabelle Gallagher, and Emmanuel Grenier. Mathematical Geophysics. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198571339.001.0001.

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Aimed at graduate students, researchers and academics in mathematics, engineering, oceanography, meteorology, and mechanics, this text provides a detailed introduction to the physical theory of rotating fluids, a significant part of geophysical fluid dynamics. The text is divided into four parts, with the first part providing the physical background of the geophysical models to be analyzed. Part two is devoted to a self contained proof of the existence of weak (or strong) solutions to the imcompressible Navier-Stokes equations. Part three deals with the rapidly rotating Navier-Stokes equations, first in the whole space, where dispersion effects are considered. The case where the domain has periodic boundary conditions is then analyzed, and finally rotating Navier-Stokes equations between two plates are studied, both in the case of periodic horizontal coordinated and those in R2. In Part IV, the stability of Ekman boundary layers and boundary layer effects in magnetohydrodynamics and quasigeostrophic equations are discussed. The boundary layers which appear near vertical walls are presented and formally linked with the classical Prandlt equations. Finally spherical layers are introduced, whose study is completely open.
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4

Keller, Evelyn Fox. Practices of generalization in mathematical physics, in biology, and in evolutionary strategies. Edited by Karine Chemla, Renaud Chorlay, and David Rabouin. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198777267.013.17.

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This article examines the different meanings as well as values associated with the mathematical and the biological sciences in relation to the kinds of generality favored by the practitioners of biological evolution. It first considers the joke of the ‘spherical cow’ told by physicists about experimental biologists, which reflects the difference in epistemological cultures that, in turn, reflects (at least in part) differences between the two fields. It then explores what these differences can tell us about practices of generalization in mathematical physics, in biology, and even in strategies of biological evolution. It also discusses generality in the physical sciences and in the life sciences, focusing on Nicolas Rashevsky’s dispute with the cell biologists that arose at the 1934 meeting of the Cold Spring Harbor Symposia on Quantitative Biology. Finally, it looks at biologists’ lack of interest in universality and universal laws.
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5

Hellman, Geoffrey, and Stewart Shapiro. Non-Euclidean Extensions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198712749.003.0006.

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This chapter adapts the foregoing results to present two non-Euclidean theories, both in line with the (semi-)Aristotelian theme of rejecting points, as parts of regions (but working with actual infinity). The first theory is a two-dimensional hyperbolic space, that is, one that has a negative constant curvature. The second theory captures a space of constant positive curvature, a two-dimensional spherical geometry. The task here is to formulate axioms on regions which allow us to prove that (i) there are no infinitesimal regions and (ii) that there are no parallels to any given “line” through any “point” not on the given “line”.
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6

Mercati, Flavio. Solutions of Shape Dynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789475.003.0013.

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This chapter deals with the most important results in SD, namely, the classical solutions of the theory in which the equivalence with (GR) breaks down. Firstly, I study the case of homogeneous but not isotropic cosmologies, known as ‘Bianchi IX’ universes in detail. In this case, each solution that reaches the big bang singularity can be continued uniquely through it, just by requiring continuity of the conformally- and scale-invariant degrees of freedom. The result is a couple of cosmological solutions with opposite orientation glued at the big bang. This result is more general than the homogeneous case, and can be extended to a large class of solutions if the BKL conjecture is valid. In the case of spherically symmetric solutions one has to couple gravity to some form of matter in order to have dynamically non-trivial degrees of freedom. The simplest case is a series of concentric infinitely thin shells of dust in a universe with the topology of a three-sphere. In this case too a departure from the dynamics of (GR) is seen, that manifests itself in a failure of the CMC slicing when one of the shells collapses (no spacetime corresponding to that solution of SD exists). The conformally invariant degrees of freedom, again, seem to still be regular when this happens. In the last part of the chapter I will discuss the sense in which one can talk about asymptotically flat solutions of SD, and past results in this regime.
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Частини книг з теми "Spherical part"

1

Hironaka, Yumiko. "Part III. Spherical functions on $p$-adic homogeneous spaces." In Algebraic and Analytic Aspects of Zeta Functions and $L$-functions, 50–72. Tokyo, Japan: The Mathematical Society of Japan, 2010. http://dx.doi.org/10.2969/msjmemoirs/02101c030.

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2

Zhao, Sanhu, Laitao Zhai, Baoyang Song, Kai Cui, Yang Li, and Bo Yu. "Analysis of Manufacturing Technology for the Spherical Head Supporting Part." In Lecture Notes in Electrical Engineering, 557–72. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3527-2_47.

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3

Sun, Xunying, and Lijie Han. "3-D Spherical Shell Modeling of Mantle Flow and Its Implication for Global Tectogenesis." In Mechanics Problems in Geodynamics Part I, 523–36. Basel: Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-9065-6_8.

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4

Mittal, Radhika, and Partha Bhowmick. "SPReAD: On Spherical Part Recognition by Axial Discretization in 4D Hough Space." In Computer Vision and Graphics, 188–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33564-8_23.

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5

Jalid, Abdelilah, Mohammed Oubrek, and Abdelouahab Salih. "Evaluation of the Form Error of Partial Spherical Part on Coordinate Measuring Machine." In Lecture Notes in Mechanical Engineering, 269–75. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62199-5_24.

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6

Hsui, Albert T., Woo-Sun Yang, and John R. Baumgardner. "A Preliminary Study of the Effects of Some Flow Parameters in the Generation of Poloidal and Toroidal Energies Within a 3-D Spherical Thermal-convective System with Variable Viscosity." In Mechanics Problems in Geodynamics Part I, 487–503. Basel: Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-9065-6_6.

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7

Elnaggar, Hebatalla, Pieter Glatzel, Marius Retegan, Christian Brouder, and Amélie Juhin. "X-ray Dichroisms in Spherical Tensor and Green’s Function Formalism." In Springer Proceedings in Physics, 83–130. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64623-3_4.

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AbstractIn this book chapter, our goal is to provide experimentalists and theoreticians with an accessible approach to the measurement or calculation of X-ray dichroisms in X-ray absorption spectroscopy (XAS). We start by presenting the key ideas of different calculation methods such as density functional theory (DFT) and ligand-field multiplet (LFM) theory and discuss the pros and cons for each approach. The second part of the chapter is dedicated to the expansion of the XAS cross section using spherical tensors for electric dipole and quadrupole transitions. This expansion enables to identify a set of linearly independent spectra that represent the smallest number of measurements (or calculations) to be performed on a sample, in order to extract all spectroscopic information. Examples of the different dichroic effects which can be expected depending on the type of transitions and on the symmetry of the system are then given.
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8

Lee, Kok-Meng. "Design, Modelling, and Control Strategies of a Three Degrees-of-Freedom VR Spherical Motor Part I: Reluctance Force Characterization." In Solid Mechanics and Its Applications, 73–109. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1818-7_3.

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9

Lee, Kok-Meng. "Design, Modelling, and Control Strategies of a Three Degrees-of-Freedom VR Spherical Motor Part II: Dynamic Modeling and Control." In Solid Mechanics and Its Applications, 111–38. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1818-7_4.

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10

Sessarego, J. P., J. Sageloli, P. Flandrin, and M. Zakharia. "Time-Frequency Analysis of Signals Related to Scattering Problems in Acoustics Part I: Wigner-Ville Analysis of Echoes Scattered by a Spherical Shell." In inverse problems and theoretical imaging, 147–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75988-8_10.

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Тези доповідей конференцій з теми "Spherical part"

1

Williams, P. D., and A. Hilton. "3D reconstruction using spherical images." In 3rd European Conference on Visual Media Production (CVMP 2006). Part of the 2nd Multimedia Conference 2006. IEE, 2006. http://dx.doi.org/10.1049/cp:20061945.

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2

Lubashevsky, Igor A., Alexander V. Priezzhev, and Vasyl V. Gafiychuk. "Free boundary model for local thermal coagulation: growth of a spherical and cylindrical necrosis domain." In BiOS '97, Part of Photonics West, edited by Steven L. Jacques. SPIE, 1997. http://dx.doi.org/10.1117/12.275501.

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3

Wang, Shanshuai, Shuhui Li, and Zhimin Li. "Mechanical stability analysis on spherical sandwich sheet at low temperature loading conditions." In NUMISHEET 2014: The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes: Part A Benchmark Problems and Results and Part B General Papers. AIP, 2013. http://dx.doi.org/10.1063/1.4850010.

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4

Chen, Tzu-Yang, Pai-Wen Ting, Min-Yu Wu, and Li-Chen Fu. "Learning a deep network with spherical part model for 3D hand pose estimation." In 2017 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2017. http://dx.doi.org/10.1109/icra.2017.7989303.

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5

Ho¨lzer, A., and M. Sommerfeld. "Lattice Boltzmann Simulation to Determine Forces Acting on Non-Spherical Particles." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45738.

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The paper is divided into two parts. In the first part the forces acting in the steady state on a cuboid in an incompressible plug flow with respect to the angle of incidence and to the particle Reynolds number are calculated. These forces are the drag force acting in flow direction and the lift force acting perpendicular to the flow direction for fixed particles and additionally the Magnus force for rotating particles. A non-uniform distribution of the force along the particle surface causes a torque and thereby a rotation of a moving particle. In the second part the resulting orientation of a long cylinder in laminar channel flow and in turbulent flows is analysed. All simulations are performed by the three-dimensional lattice Boltzmann method (LBM).
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6

Takiguchi, Yu, Hisayoshi Takamoto, Masamitsu Kanada, Takashi Inoue, Naoya Matsumoto, and Susumu Terakawa. "Numerical spherical aberration correction method using spatial light modulator under deep-part fluorescence observation." In SPIE BiOS, edited by Thomas G. Brown, Carol J. Cogswell, and Tony Wilson. SPIE, 2014. http://dx.doi.org/10.1117/12.2038394.

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7

Terada, Susumu. "Development of Alternate Methods for Establishing Design Margins for ASME Section VIII Division 3: Part 2." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77209.

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The design margin against collapse for Division 3 is based on Nadal’s equation. For high strength material this method is adequate. However for material with a lower ratio of Sy/Su this method has additional margin from yielding through the thickness to final collapse or burst. The experimental burst test results for closed-end cylinder show the excessive margin for these materials as stated in former paper. Therefore the development of alternate methods for establishing design margin for all materials is desirable. The design margin of 1.5 in equation for open-end cylindrical shell and spherical shell in current code is different from that of 1.732 for closed-end cylindrical shell. The design margin of elastic-plastic analysis is 1.732. Therefore the consistent design margins of equations and elastic-plastic analysis for open-end cylindrical shells and spherical shells are also desirable. In this paper new equations for design pressure of cylindrical shell and spherical shell are proposed by investigation of burst test results and case studies of various methods.
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8

Turner, Michael L., David A. Perkins, Andrew P. Murray, and Pierre M. Larochelle. "Systematic Process for Constructing Spherical Four-Bar Mechanisms." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80058.

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This paper presents a methodology for constructing spherical four-bar mechanisms with an emphasis on utilizing simpler machining processes and part geometries. By building each link out of easily created pieces instead of a single complex shape, a mechanism can be quickly prototyped and tested. The paper discusses the benefits and some of the issues that need to be addressed by this approach. Significant areas of concern include link design and tolerancing issues.
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9

Le, Minh-Quy, Jin-Woo Yi, and Seock-Sam Kim. "Finite Element Analysis of Ceramic Coating Systems Under Spherical Indentation With Metallic Interlayer: Part I — Uncracked Coatings." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64209.

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Spherical indentation problems of ceramic coatings/metallic inter-layer/ductile substrate were investigated numerically by axisymmetric finite element analysis (FEA) for two typical ceramic coatings with relatively high and low elastic modulus deposited on aluminum alloy and carbon steel. Various indenter radius-coating thickness ratios and interlayer thickness-coating thickness ratios were used in the modeling. Radial stress distribution and plastic damage zones evolution were discussed in connection with model parameters. The results showed that the suitable metallic interlayer could improve resistance of ceramic coating systems through reducing the peak tensile radial stress on the surface and interface of ceramic coatings and plastic damage zone size in the substrate under spherical indentation.
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Le, Minh-Quy, Jin-Woo Yi, and Seock-Sam Kim. "Finite Element Analysis of Ceramic Coating Systems Under Spherical Indentation With Metallic Interlayer: Part II — Ring Crack Analysis." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64210.

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Spherical indentation problems of ceramic coatings/metallic inter-layer/ductile substrate were investigated numerically by axisymmetric FEA for two typical ceramic coatings with relatively high and low elastic modulus deposited on aluminum alloy and carbon steel. The fracture mechanics of the ceramic coatings due to occurrence of surface ring cracks extending traverse coating thickness under spherical indenter were considered under the framework of linear fracture mechanics. The J-integral associated to such cracks was computed. The evolution of J-integral versus crack length and indentation depth was studied. The results show that metallic inter-layers can improve the fracture resistance of the ceramic layer under the same indentation conditions.
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Звіти організацій з теми "Spherical part"

1

Blackwell, David D., David N. Walker, Sarah J. Messer, and William E. Amatucci. Antenna Impedance Measures in a Magnetized Plasma. Part 1. Spherical Antenna. Fort Belvoir, VA: Defense Technical Information Center, October 2006. http://dx.doi.org/10.21236/ada457022.

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2

Johnson, B. R. Light Scattering from a Spherical Particle on A Conducting Plane. Part 1. Normal Incidence. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada265920.

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3

Grinfeld, Michael, and Todd Bjerke. The Impact-Induced Triggering of Hot Spots in Energetic/Explosive Materials Part 2: Adiabatic Temperature Distribution Near a Spherical Hole. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada516826.

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4

McElwain, Terry F., Eugene Pipano, Guy H. Palmer, Varda Shkap, Stephn A. Hines, and Wendy C. Brown. Protection of Cattle against Babesiosis: Immunization against Babesia bovis with an Optimized RAP-1/Apical Complex Construct. United States Department of Agriculture, September 1999. http://dx.doi.org/10.32747/1999.7573063.bard.

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Previous research and current efforts at control of babesiosis fall short of meeting the needs of countries where the disease is endemic, such as Israel, as well as the needs of exporting countries and countries bordering on endemic areas, such as the U.S. Our long-term goal is to develop improved methods of immunization against bovine babesiosis based on an understanding of the molecular mechanisms of immune protection and parasite targets of a protective immune response. In our previous BARD project, we established the basis for focusing on rhoptry antigens as components of a subunit vaccine against bovine babesiosis, and for additional research to better characterize rhoptry associated protein-1 (RAP-1) as a target of protective immunity. In this continuation BARD project, our objectives were to [1] optimize the immune response against RAP-1, and [2] identify additional rhoptry candidate vaccine antigens. The entire locus encoding B. bovis RAP-1 was sequenced, and the rap-1 open reading frame compared among several strains. Unlike B. bigemina, in which multiple gene copies with variant domains encode RAP-1, the B. bovis RAP-1 locus contains only two identical genes which are conserved among strains. Through testing of multiple truncated constructs of rRAP-1, one or more immunodominant T cell epitopes were mapped to the amino terminal half of RAP-1. At least one linear and one conformational B cell epitope have been demonstrated in the same amino terminal construct, which in B. bigemina RAP-1 also contains an epitope recognized by neutralizing antibody. The amine terminal half of the molecule represents the most highly conserved part of the gene family and contains motifs conserved broadly among the apicomplexa. In contrast, the carboxy terminal half of B. bovis RAP-1 is less well conserved and contains multiple repeats encoding a linear B cell epitope potentially capable of inducing an ineffective, T cell independent, type 2 immune response. Therefore, we are testing an amino terminal fragment of RAP-1 (RAP-1N) in an immunization trial in cattle. Cattle have beer immunized with RAP-1N or control antigen, and IL-12 with Ribi adjuvant. Evaluation of the immune response is ongoing, and challenge with virulent B. bovis will occur in the near future. While no new rhoptry antigens were identified, our studies did identify and characterize a new spherical body antigen (SBP3), and several heat shock proteins (HSP's). The SBP3 and HSP21 antigens stimulate T cells from immune cattle and are considered new vaccine candidates worthy of further testing. Overall, we conclude that a single RAP-1 vaccine construct representing the conserved amino terminal region of the molecule should be sufficient for immunization against all strains of B. bovis. While results of the ongoing immunization trial will direct our next research steps, results at this time are consistent with our long term goal of designing a subunit vaccine which contains only the epitopes relevant to induction of protective immunity. Parallel studies are defining the mechanisms of protective immunity. Apicomplexan protozoa, including babesiosis and malaria, cause persistent diseases for which control is inadequate. The apical organelles are defining features of these complex protozoa, and have been conserved through the evolutionary process, Past and current BARD projects on babesiosis have established the validity and potential of exploiting these conserved organelles in developing improved control methods applicable to all apicomplexan diseases.
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