The geometric curvature of the spine during the sirshasana,the yoga’s headstand     

Mário Hebling Campos  Nayane Martins Giraldi  Paulo Gentil  Claudio Andre Barbosa de Lira  Carlos A. Vieira  Marcelo Costa de Paula 《Journal of sports sciences》2017,35(12):1134-1141

This study analysed the behaviour of the geometric curvature of the spine during sirshasana. The position of dorsal retroreflective markers was computed via stereophotogrammetric analysis in six males and five females (29.4 ± 8.8 years, 63.0 ± 11.4 kg, 1.66 ± 0.08 m [average ± standard deviation]). The spinal points were projected onto the sagittal and frontal planes of the trunk, a polynomial was fitted to the data and the two-dimensional geometric curvature was quantified. The inferior lumbar lordosis decreased compared to the orthostatic position and gait, which may favour the posterior protrusion of the lumbar spinal nucleus pulposus in people with posterior herniation. The lateral deviation at the middle of the thoracic spine increases during sirshasana, which may reflect increased difficulties for postural control and spinal loads. It could be useful for promoting positive spinal structural and functional chronic adaptations for healthy participants, if the yoga programme is carefully planned and the spinal alignment is carefully monitored during a headstand. However, it may aggravate some spinal diseases, especially scoliosis.  相似文献   

Some contributions from Latin American career counselling for dealing with situations of psychosocial vulnerability     

Marcelo Afonso Ribeiro  Maria da Conceição Coropos Uvaldo  Fabiano Fonseca da Silva 《International Journal for Educational and Vocational Guidance》2015,15(3):193-204

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Asymmetry of red blood cell motions in a microchannel with a diverging and converging bifurcation     

Leble V  Lima R  Dias R  Fernandes C  Ishikawa T  Imai Y  Yamaguchi T 《Biomicrofluidics》2011,5(4):44120-4412015

In microcirculation, red blood cells (RBCs) flowing through bifurcations may deform considerably due to combination of different phenomena that happen at the micro-scale level, such as: attraction effect, high shear, and extensional stress, all of which may influence the rheological properties and flow behavior of blood. Thus, it is important to investigate in detail the behavior of blood flow occurring at both bifurcations and confluences. In the present paper, by using a micro-PTV system, we investigated the variations of velocity profiles of two working fluids flowing through diverging and converging bifurcations, human red blood cells suspended in dextran 40 with about 14% of hematocrit level (14 Hct) and pure water seeded with fluorescent trace particles. All the measurements were performed in the center plane of rectangular microchannels using a constant flow rate of about 3.0 × 10⁻¹² m³/s. Moreover, the experimental data was compared with numerical results obtained for Newtonian incompressible fluid. The behavior of RBCs was asymmetric at the divergent and convergent side of the geometry, whereas the velocities of tracer particles suspended in pure water were symmetric and well described by numerical simulation. The formation of a red cell-depleted zone immediately downstream of the apex of the converging bifurcation was observed and its effect on velocity profiles of RBCs flow has been investigated. Conversely, a cell-depleted region was not formed around the apex of the diverging bifurcation and as a result the adhesion of RBCs to the wall surface was enhanced in this region.  相似文献   

Identifying the information management process and knowledge creation in technology-based companies: a Brazilian comparative case study     

Vick  Thais Elaine  Nagano  Marcelo Seido  Santos  Fernando César Almada 《知识管理研究与实践》2013,11(3):278-287

Knowledge Management Research & Practice - Information and knowledge have been cited over the last two decades as competitive advantage tools. Recently, the use of them has been discussed to...  相似文献   

Self-training through the Internet     

António S. C. Fernandes  Maria João Martins 《European Journal of Engineering Education》2001,26(2):169-177

The development of five courses, aimed at advanced engineering training, using the Internet, is described in this paper. A European consortium was responsible for the development, implementation and testing of the courses through the organization of virtual classes on the Internet. An important outcome was the definition of the training service characteristics, which led to the development of a quality system based on four fundamental concepts: credit, accreditation, certification and qualification. Professionals of several age groups and industrial sectors with different expectations as well as engineering students attended pilot virtual classes. From the trainee's side, we report on how the training opportunity was received and how the training service provided was felt. The main project successes and a few weak points and a number of important recommendations are listed for future reference.  相似文献   

Signal constellations in the hyperbolic plane: A proposal for new communication systems     

Eduardo Brandani da Silva  Marcelo Firer 《Journal of The Franklin Institute》2006,343(1):69-82

Signal constellations in the hyperbolic plane are provided as an alternative to traditional signal constellations in the Euclidean plane, since channels may actually exist for which the latter signal constellations are not as suitable as the former. A hyperbolic gaussian probability density function, based solely on geometrical considerations, is derived to determine the performance of the hyperbolic signal constellations. Benefits result from an approach conceived in terms of reduced signal-to-noise ratio, needed to achieve a prescribed error rate and equivalent optimum receiver complexity.  相似文献   

Reading and spelling acquisition in European Portuguese: a preliminary study     

Sandra Fernandes  Paulo Ventura  Luís Querido  José Morais 《Reading and writing》2008,21(8):805-821

We investigated the initial development of reading and spelling in European Portuguese. First-graders, tested in February and June, had to read and spell words and pseudowords. In February there were regularity and graphemic complexity effects, indicating that these children relied on grapheme–phoneme conversion. The lexicality effect found in spelling, in June, suggest that by the end of first grade these children had begun to construct an orthographic lexicon. However, lexical addressing is not inconsistent with phonological mediation as regularization errors increased between the sessions. Additionally, the previously reported similarity in global performance of Portuguese and French beginning readers may conceal processing differences that are related to specific characteristics of the corresponding orthographic codes.

Sandra FernandesEmail:

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Conception, development and implementation of an e-Government maturity model in public agencies   总被引：1，自引：0，他引：1  

Gonzalo Valdés^{Author Vitae}  Mauricio SolarAuthor VitaeHernán AstudilloAuthor Vitae  Marcelo IribarrenAuthor VitaeGastón ConchaAuthor Vitae  Marcello ViscontiAuthor Vitae 《Government Information Quarterly》2011,28(2):176-187

Governments worldwide are encouraging public agencies to join e-Government initiatives in order to provide better services to their citizens and businesses; hence, methods of evaluating the readiness of individual public agencies to execute specific e-Government programs and directives are a key ingredient in the successful expansion of e-Government. To satisfy this need, a model called the eGovernment Maturity Model (eGov-MM) was developed, integrating the assessment of technological, organizational, operational, and human capital capabilities, under a multi-dimensional, holistic, and evolutionary approach. The model is strongly supported by international best practices, and provides tuning mechanisms to enable its alignment with nation-wide directives on e-Government. This article describes how the model was conceived, designed, developed, field tested by expert public officials from several government agencies, and finally applied to a selection of 30 public agencies in Chile, generating the first formal measurements, assessments, and rankings of their readiness for e-Government. The implementation of the model also provided several recommendations to policymakers at the national and agency levels.  相似文献   

Mathematics learning and assessment using MathE platform: A case study     

Azevedo  Beatriz Flamia  Pereira  Ana I.  Fernandes  Florbela P.  Pacheco  M. Fatima 《Education and Information Technologies》2022,27(2):1747-1769

Education and Information Technologies - Universities are encouraging the implementation of innovative methodologies and teaching strategies to develop an interactive and appealing educational...  相似文献   

Introduction to the special section: life design interventions (counseling,guidance, education) for decent work and sustainable development     

Chhabra  Meenakshi  Ribeiro  Marcelo Afonso  Rossier  Jérôme 《International Journal for Educational and Vocational Guidance》2022,22(3):577-579

International Journal for Educational and Vocational Guidance -  相似文献