Analysis of laminated beams using the natural neighbour radial point interpolation method

Neste trabalho aplica‐se o método sem malha natural neighbour radial point interpolation method (NNRPIM) à análise unidimensional de vigas laminadas, considerando a teoria de Timoshenko. O NNRPIM combina o conceito matemático dos vizinhos naturais com a interpolação radial pontual. Os diagramas de Voronoï permitem impor a conectividade nodal e construir a malha de fundo para efeitos de integração, por intermédio das células de influência. É apresentada a construção das funções de interpolação NNRPIM, sendo, para estas, usada a função de base radial multiquadrática. As funções de interpolação geradas possuem continuidade infinita e a propriedade de delta Kronecker, o que facilita a imposição das condições de fronteira, uma vez que estas podem ser impostas com o método da imposição direta, tal como no método dos elementos finitos (FEM). De modo a obter o campo de deslocamentos e de deformações, a teoria de deformação de Timoshenko para vigas sujeitas a esforços transversos é considerada. Vários exemplos numéricos de vigas isotrópicas e vigas laminadas são apresentados de modo a demonstrar a convergência e a exatidão da aplicação proposta. Os resultados obtidos são comparados com soluções analíticas disponíveis na literatura.In this work, a meshless method, “natural neighbour radial point interpolation method” (NNRPIM), is applied to the one‐dimensional analysis of laminated beams, considering the theory of Timoshenko. The NNRPIM combines the mathematical concept of natural neighbours with the radial point interpolation. Voronoï diagrams allows to impose the nodal connectivity and the construction of a background mesh for integration purposes, via influence cells. The construction of the NNRPIM interpolation functions is shown, and, for this, it is used the multiquadratic radial basis function. The generated interpolation functions possess infinite continuity and the delta Kronecker property, which facilitates the enforcement of boundary conditions, since these can be directly imposed, as in the finite element method (FEM). In order to obtain the displacements and the deformation fields, it is considered the Timoshenko theory for beams under transverse efforts. Several numerical examples of isotropic beams and laminated beams are presented in order to demonstrate the convergence and accuracy of the proposed application. The results obtained are compared with analytical solutions available in the literature.Peer Reviewe

Chromosome studies on the silky anteater Cyclopes Didactylus L. (Myrmecophagidae: Xenarthra, Edentata)

The karyotype of the silky anteater Cyclopes didactylus, the smallest of the anteaters is described. A notable difference in karyotypes exists between C. didactylus (2n = 64) and the other species of the family Myrmecophagidae. Both fusion/fission as well as other mechanisms are probably involved in the reduction of the chromosome number of 64 chromosome in Cyclopes to 60 and 54 in Tamandua and Myrmecophaga, respectively. © 1985 Taylor & Francis Group, LLC

Micrometric periodic assembly of magnetotactic bacteria and magnetic nanoparticles using audio tapes

We report micrometric periodic assembly of live and dead magnetotactic bacteria, Magnetospirillum magneticum AMB-1, which synthesize chains of magnetic nanoparticles inside their bodies, and of superparamagnetic Fe 3 O 4 and ferromagnetic CoFe 2 O 4 nanoparticles in aqueous suspensions using periodically magnetized audio tapes. The distribution of the stray magnetic field at the surface of the tapes was determined analytically and experimentally by magneto-optic imaging. Calculations showed that the magnetic field close to the tape surface was of the order of 100 mT, and the magnetic field gradient was larger than 1 T mm -1 . Drops of aqueous solutions were deposited on the tapes, and bacteria and particles were trapped at locations where magnetic energy is minimized, as observed using conventional optical microscopy. Suspensions of M. magneticum AMB-1 treated with formaldehyde and kanamycin were studied, and patterns of trapped dead bacteria indicated that magnetic forces dominate over self-propelling forces in these experiments, in accordance with calculated values. The behavior of the different types of samples is discussed. © 2012 American Institute of Physics.Fil:Jorge, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Ferrari, H.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Antonel, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Ruiz, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Negri, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Pettinari, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina

Four spot megrim (Lepidorhombus boscii) weight-length and weight-weight relationships in northern Iberian waters (stock 8.c, 9.a)

Total weight-length, gutted weight-length and total weight-gutted weight relationships were fitted for the Iberian Atlantic stock of four spot megrim (Lepidorhombus boscii) and their temporal variations were analyzed. The large sample size, size range and timeseries available allowed obtaining robust somatic parameters of combined sexes for the total weight-length relationships (a=0.0043, b=3.2008), for the gutted weight-length relationships (a=0.0055, b=3.1139), and the weight conversion factors (1.062). They are considered to best fit the current biometric relationships and most appropriate to be used in the stock assessment of the status of the stock and they contribute to a deeper knowledge of the life history traits of this species

Uso De Práticas Integrativas E Complementares Por Doulas Em Maternidades De Fortaleza (ce) E Campinas (sp)

This study aimed to analyze the Integrative and Complementary Practices (ICP) applied by doulas in the cities of Fortaleza (CE) and Campinas (SP). This is a qualitative study encompassing fifteen doulas: nine from Fortaleza and six from Campinas. The data were collected in the second half of 2010 by conducting semi-structured and pre-organized interviews following the procedures of thematic content analysis. The interpretations of the results were based on the idea that institutionalization of knowledge and practices happen through the conformation of nuclei and fields. The nucleus demarcates the identity of an area of knowledge and the professionals’ practices, and the field demarcates the blurred limits among disciplines that can be submitted to conflicts. We observed that the support offered by doulas permeates a variety of practices framed in traditional medicine as well as in complementary and alternative medicine. ICP was associated with decreases in length of labor, superior pain management, ability of making decision and empowering of women. It is understood that the range of activities offered by doulas and the use of ICP converge to the uniqueness, respect and autonomy of women. Furthermore, it proposes a new model of awareness and practices centered on the importance of the natural process of childbirth. © 2016, UNIV SAOPAULO. All rights reserved.25110812

Magnetic Field Sensor With Terfenol-d Thin-film Coated Fbg

In this work a magnetic field sensor based on an FBG coated with a thin film of Terfenol-D is presented. The sensor was tested with two optical interrogation systems: one, a scanning laser system with a 1 pm resolution, and the other a differential white light interferometer (WLI). The results obtained in the magnetic field range of 20 mT to 100 mT, show the possibility of increasing the magnetic field measurement resolution, with temperature fluctuations invariance, by a factor of 4.5 when using the WLI system. © 2012 SPIE.8421Mora, J., Diez, A., Cruz, J.L., A magnetostrictive sensor interrogated by fiber gratings for DC-Current and temperature discrimination (2000) Ieee Photonic Tech L, 12 (12), pp. 1680-1682Satpathi, D., Moore, J.A., Ennis, M.G., Design of a terfenol-D based fiber-optic current transducer (2005) Ieee Sens J, 5 (5), pp. 1057-1065Li, M.F., Giant Magnetostrictive Magnetic Fields Sensor Based on Dual Fiber Bragg Gratings, pp. 490-495Mora, J., Martinez-Leon, L., Diez, A., Simultaneous temperature and ac-current measurements for high voltagelines using fiber Bragg gratings (2006) Sensor Actuat A-Phys, 125 (2), pp. 313-316Reilly, D., Willshire, A.J., Fusiek, G., A fiber-Bragg-grating-based sensor for simultaneous AC current and temperature measurement (2006) Ieee Sens J, 6 (6), pp. 1539-1542Davino, D., Visone, C., Ambrosino, C., Compensation of hysteresis in magnetic field sensors employing Fiber Bragg Grating and magneto-elastic materials (2008) Sensor Actuat A-Phys, 147 (1), pp. 127-136Yang, M.H., Dai, J.X., Zhou, C.M., Optical fiber magnetic field sensors with TbDyFe magnetostrictive thin films as sensing materials (2009) Opt Express, 17 (23), pp. 20777-20782Quintero, S.M.M., Braga, A.M.B., Weber, H.I., A magnetostrictive composite-fiber Bragg grating sensor (2010) Sensors-Basel, 10 (9), pp. 8119-8128Smith, G.N., Characterisation and performance of a Terfenol-D coated femtosecond laser inscribed optical fibre Bragg sensor with a laser ablated microslot for the detection of static magnetic fields (2011) Opt Express, 19 (1), pp. 363-370Quintero, S.M.M., Martelli, C., Braga, A., Magnetic field measurements based on terfenol coated photonic crystal fibers (2011) Sensors-Basel, 11 (12), pp. 11103-1111

Pozzolanic activity of a spent fluid catalytic cracking catalyst residue

Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.The reaction between a spent fluid cracking catalyst (FC3R) residue and portlandite was monitored over 56 days using several material characterisation techniques. The results showed that the residue was heterogeneous and composed of reactive and non-reactive fractions and that both fractions contained silicon and aluminium. After 56 days, the development of C-S-H gel was evident; part of the catalyst residue was pozzolanic. The CH combination could be monitored by thermogravimetry or X-ray diffraction, by measuring the signal corresponding to CH. However, due to the low crystallinity of cementing products and their complex stoichiometry, the above-mentioned techniques were less able to characterise C-A-S-H. However, nuclear magnetic resonance techniques allowed the evolution of the pozzolanic reaction to be evaluated and the hydrate products to be characterised. Thomas Telford Ltd & 2011.Garcés, P.; Glasser, FP.; Brew, DR.; Zornoza Gómez, EM.; Paya Bernabeu, JJ. (2011). Pozzolanic activity of a spent fluid catalytic cracking catalyst residue. Advances in Cement Research. 23(3):105-111. doi:10.1680/adcr9.00036S10511123