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Search Results: 1 - 10 of 3707 matches for " Osvaldo;Aoki "
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Infrared imaging contribution for intestinal ischemia detection in wound healing
Malafaia, Osvaldo;Brioschi, Marcos Leal;Aoki, Sonia Maria Schneider;Dias, Fernando Gallego;Gugelmin, Bruno Schneider;Aoki, Massao Schneider;Aoki, Yuki Schneider;
Acta Cirurgica Brasileira , 2008, DOI: 10.1590/S0102-86502008000600008
Abstract: purpose: to study thermal variations obtained through infrared image in rats, and to evaluate the relationship between intestinal ischemic time and histopathological findings. methods: thirty wistar rats were operated after distribution in 5 groups with different times of ischemia. thermograms were obtained by using a infrared camera. the surgical technique has been standardized for all groups: abdominal cavity opening by a 5cm length incision in the midline, abdominal wall plans section and cavity exposure, and exteriorization of the intestine. in group i (control), it was proceeded only laparotomy without superior mesenteric artery ligature. after first thermogram done, incision was closed with continuing suture. in each rat in groups ii, iii, iv and v, the superior mesenteric artery was located at its origin on abdominal aorta, dissected and occluded with a vascular microclamp, subjecting the intestine to ischemia in variable times. results: rats submitted to a 30 minutes ischemia presented reactive hyperemia, thermal differential of 1.8°c and normal pathological examination. the 1 hour ischemia produced reactive hyperemia with ischemic areas, thermal differential of 1.0°c and injuries at villosities' tips. however, the 90 minutes ischemia had not shown reactive hyperemia with large ischemic areas, thermal differential of -1.0°c and injury in the upper third of the villosities. the 2 hours ischemia demonstrated a severe ischemia, thermal differential of -2.0°c and injury throughout the all villosities' extension. conclusion: it has been possible studying thermal variations through infrared image in rats, showing correlation between thermal response in thermograms, ischemic time and histopathological findings.
Cria??o de protocolo eletr?nico em cancer do colo do útero
Fernandes, Gustavo Leme;Santos, Roberto Euzébio dos;Malafaia, Osvaldo;Aoki, Tsutomu;
Revista do Colégio Brasileiro de Cirurgi?es , 2012, DOI: 10.1590/S0100-69912012000100007
Abstract: objective: development of an electronic protocol for cancer of the cervix. methods: we collected data through a literature review and formatted them to build a theoretical base for cancer of the cervix for inclusion in the protocol. the computerized database used the sinpe ? (integrated electronic protocols) developed at the federal university of parana by the graduate program in surgery, department of health sciences, with the help of the laboratory of computer and multimedia. results: we created 2,687 items, grouped into seven main categories: history, physical examination, laboratory tests, diagnosis, final pathology, treatment and monitoring. we added items on socio-demographic indicators, contraceptive use, smoking, gynecological and obstetrical histories, staging, the most widely accepted classifications and nomenclatures, diagnostic methods, treatments and follow-up. conclusion: it is possible to develop an electronic protocol with low cost, little space and minimal staff training. the use of computers avoids limitations and the subjective character of written records. with the data collected in an appropriate manner it is possible to determine, through statistical analysis, the importance of each factor in cancer development and progression and prognosis.
Hypothesis of Conservation of Particle Number  [PDF]
Kozo Aoki
Open Journal of Microphysics (OJM) , 2011, DOI: 10.4236/ojm.2011.11001
Abstract: As for several nuclear reactions, the electroweak interaction is simply explained by a law of conservation of particle number. We find that the positron and electron consist of the three fundamental particles, and , respectively. Furthermore, the members of the second and third generations quark composites consist of the first generation quark and the neutrino of fundamental particles. The particle and its anti- particle pair(or neutrino and its antineutrino pair) have to be an energy quantum (or a photon). The minimum Higgs boson (called “God particle”) might be a neutral pion. The fundamental particles are simply up and down quark, neutrino, muon-neutrino, and those anti-particles.
Second Thoughts about the τ-θ Puzzle  [PDF]
Kozo Aoki
Open Journal of Microphysics (OJM) , 2012, DOI: 10.4236/ojm.2012.23006
Abstract: The new parity value of π0 was determined according to the hypothesis of conservation of particle number. The theo-retical pentaquark proton’s parity value was also determined, and it was found that the conservation of parity is account nicely for the τ-θ puzzle.
Characteristics of Unsteady Boundary Layer Induced by the Compression Wave Propagating in a Tunnel  [PDF]
Toshiyuki Tanaka, Toshiyuki Aoki
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24A030

A compression wave is generated ahead of a high-speed train, while entering a tunnel. This compression wave propa- gates to the tunnel exit and spouts out as a micro pressure wave, causing an exploding sound. In order to estimate the magnitude correctly, the mechanism of the attenuation and distortion of a compression wave propagating along a tunnel must be understood and experimental information on these phenomena is required. An experimental and numerical in- vestigation is carried out to clarify the mechanism of the propagating compression wave in a tube. The final objective of our study is to understand the mechanism of the attenuation and distortion of propagating compression waves in a tun- nel. In the present paper, experimental investigations are carried out on the transition of the unsteady boundary layer induced by a propagating compression wave in a model tunnel by means of a developed laser differential interferometry technique.

Laterality and Accuracy of Force Exertion in Elbow Flexion  [PDF]
Hiroki Aoki, Shinichi Demura
Advances in Physical Education (APE) , 2017, DOI: 10.4236/ape.2017.71009
In elbow flexion, accuracy of force exertion on demand values might differ between dominant and non-dominant hands. This study examined laterality and accuracy of force exertion in elbow flexion. The participants were 22 right-handed, healthy young males (mean age 22.6 ± 4.3 yrs, mean height 172.7 ± 7.0 cm, mean mass 75.0 ± 12.3 kg). Demand values of 25%, 50%, and 75% of maximum voluntary contraction (MVC) were selected. Using subjective judgment, the participants exerted the elbow flexion strength of each arm on each demand value. Evaluation parameters were differences (errors) between demand and exertion values and their total error. The results of a two-way ANOVA (dominant and non-dominant arms × demand value) showed significant interaction. In multiple comparison tests, errors were greater in 25% MVC than in 50% and 75% MVC for both arms. However, no significant difference was found between arms. In conclusion, in both dominant and non-dominant arms, accuracy of force exertion in elbow flexion does not show laterality and is higher in greater demand values (over 50% MVC) than in lesser values (25% MVC).
The Precise Determination of Mass through the Oscillations of a Very High-Q Electromechanical System  [PDF]
Osvaldo F. Schilling
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.53015

The present paper is based upon the fact that if an object is part of a highly stable oscillating system, it is possible to obtain an extremely precise measure for its mass in terms of the energy trapped in the system, rather than through a ratio between force and acceleration, provided such trapped energy can be properly measured. The subject is timely since there is great interest in Metrology on the establishment of a new electronic standard for the kilogram. Our contribution to such effort includes both the proposal of an alternative definition for mass, as well as the description of a realistic experimental system in which this new definition might actually be applied. The setup consists of an oscillating type-II superconducting loop subjected to the gravity and magnetic fields. The system is shown to be able to reach a dynamic equilibrium by trapping energy up to the point it levitates against the surrounding magnetic and gravitational fields, behaving as an extremely high-Q spring-load system. The proposed energy-mass equation applied to the electromechanical oscillating system eventually produces a new experimental relation between mass and the Planck constant.

A Phenomenological Model for the Electromagnetic Origin of Mass in Particles, and Its Quantitative Application to the Electron, the Muon, the Proton, and the Neutron  [PDF]
Osvaldo F. Schilling
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.49161

A simple phenomenological model is developed, which indicates the existence of a direct link between the concept of rest mass of a particle and magnetodynamic energies associated to the formation of the particle. The model is based upon the principles of quantization and conservation of flux, well known for their application in superconductivity. The charge of particles is considered as forming vortices of superconducting currents, which we postulate are created by electromagnetic fluctuations from vacuum (or related processes). A new quantization rule gathers the size, the magnetic moment, and the rest mass of the particle and associates these quantities to the integer number of flux quanta that should be stored in the vortices corresponding to each particle. The model is applied to the electron, the muon, the proton, and the neutron. Quantitative consistency with available experimental data for these subatomic particles is obtained.

Approximation Method for the Relaxed Covariant Form of the Gravitational Field Equations for Particles  [PDF]
Emanuel Gallo, Osvaldo M. Moreschi
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329161
Abstract: We present a study of the so called relaxed field equations of general relativity in terms of a decomposition of the metric; which is designed to deal with the notion of particles. Several known results are generalized to a coordinate free covariant discussion. We apply our techniques to the study of a particle up to second order.
Advantages of Endoscopically Assisted Surgery for Attic Cholesteatoma
Kazuhiro Aoki
Diagnostic and Therapeutic Endoscopy , 2001, DOI: 10.1155/dte.7.99
Abstract: Combined use of an operating microscope and a middle ear endoscope seems to be helpful for selecting an appropriate surgical technique and for identifying more patients in whom cholesteatoma can be removed by a trans-canal approach alone. To investigate whether attic cholesteatoma can be treated by a trans-canal approach alone, a review was performed of patients who had undergone endoscopically assisted tympanoplasty and the outcome of surgery was compared with the preoperative CT findings. Using a rigid endoscope (3 mm in diameter and 6 cm in length with a viewing angle of 30°), twenty eight patients were examined to determine whether total resection of the cholesteatoma was possible by trans-canal atticotomy alone. According to the CT findings, total resection of cholesteatoma was possible by trans-canal atticotomy combined with the use of a rigid endoscope not only in 4 patients with the shadow localized in the epitympanum on preoperative CT scans but also in 18 out of 24 patients with the shadow extending from the epitympanum to the distal mastoid air cells. This study indicates that the trans-canal approach with endoscopic guidance is a useful technique for the treatment of cholesteatoma.
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