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Search Results: 1 - 10 of 20031 matches for " Alberto; Tejerina-Lobo "
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Regeneración periodontal en defectos intraóseos de 2-3 paredes con tres membranas diferentes: Un ensayo clínico randomizado
Enrile de Rojas,Francisco J.; Buitrago-Vera,Pedro J.; Sicilia-Felechosa,Alberto; Tejerina-Lobo,José Ma;
RCOE , 2006, DOI: 10.4321/S1138-123X2006000100002
Abstract: background: a study is made to evaluate the clinical efficacy, in terms of clinical attachment gained, of two resorbable membranes versus a positive control (non-resorbable membrane), in the treatment of two-three wall intrabony defects. patients and method: we selected 36 patients in whom 43 two-three wall intrabony lesions were detected. prior to surgery we recorded pocket depth and gingival recession (clinical attachment level). after a full thickness flap approach, debridement and measurement of the defects, and instrumentation of the root wall, the membrane was placed. clinical follow-up was carried out after 1, 2, 4, 6 and 8 weeks, and 3, 6 and 12 months, with radiological controls after 6 and 12 months. results: a total of 36 defects completed the study, corresponding to 30 patients. after one year a mean reduction in pocket depth of 3.98 mm was recorded, with a 0.17 mm recession increment and a clinical attachment gain (nci) of 3.97 mm. no significant differences were observed between the different membranes used.
Editorial. El significado de las demandas “menores” en salud mental.
Alberto Ortiz Lobo
Revista de la Asociación Espa?ola de Neuropsiquiatría , 2011,
Abstract: Cuentan que hace muchos a os, había un psiquiatra atareado y de sólida formación médica que, cuando los pacientes comenzaban a relatarle las circunstancias vitales de su malestar, este les respondía: - Le cuento yo mi vida? No, verdad? Pues entonces usted limítese a contarme sus síntomas. Y resulta curioso cómo aquella anécdota se ha materializado hoy en día, en muchos pacientes que ya no se pierden en detalles innecesarios, e incluso nos proporcionan ellos mismos directamente el diagnóstico: - Tengo una depresión O en otros tantos profesionales que han desarrollado una extraordinaria capacidad de desligar los síntomas del contexto en el que se desenvuelven.
Multimode gravitational wave detection: the spherical detector theory
J. Alberto Lobo
Physics , 2000,
Abstract: A spherical gravity wave (GW) detector, unlike interferometers and bars, is a natural multi-mode device, i.e., it is capable of independently gathering information on all five quadrupole and one monopole amplitudes of a general incoming GW. This is because the sphere's degenerate oscillation eigenmodes are uniquely matched to the structure of the GWs' Riemann tensor components. Suitable linear combinations of the system readout channels completely deconvolve the six GW amplitudes. The present article is concerned with the theoretical reasons for the remarkable properties of a spherical GW detector. The analysis proceeds from first principles and is based on essentially no 'ad hoc' hypotheses. The mathematical beauty of the theory is outstanding, and abundant detail is given for a thorough understanding of the fundamental facts and ideas. Experimental evidence of the accuracy of the model is also provided, where possible.
What can we learn about GW Physics with an elastic spherical antenna?
J. Alberto Lobo
Physics , 2000, DOI: 10.1103/PhysRevD.52.591
Abstract: A general formalism is set up to analyse the response of an arbitrary solid elastic body to an arbitrary metric Gravitational Wave perturbation, which fully displays the details of the interaction antenna-wave. The formalism is applied to the spherical detector, whose sensitivity parameters are thereby scrutinised. A multimode transfer function is defined to study the amplitude sensitivity, and absorption cross sections are calculated for a general metric theory of GW physics. Their scaling properties are shown to be independent of the underlying theory, with interesting consequences for future detector design. The GW incidence direction deconvolution problem is also discussed, always within the context of a general metric theory of the gravitational field.
The mathematical theory of resonant transducers in a spherical gravity wave antenna
J. Alberto Lobo
Physics , 2000, DOI: 10.1046/j.1365-8711.2000.03492.x
Abstract: The rigoruos mathematical theory of the coupling and response of a spherical gravitational wave detector endowed with a set of resonant transducers is presented and developed. A perturbative series in ascending powers of the square root of the ratio of the resonator to the sphere mass is seen to be the key to the solution of the problem. General layouts of arbitrary numbers of transducers can be assessed, and a specific proposal (PHC), alternative to the highly symmetric TIGA of Merkowitz and Johnson, is described in detail. Frequency spectra of the coupled system are seen to be theoretically recovered in full agreement with experimental determinations.
Non-Linear gravitational growth of large scale structures inside and outside standard Cosmology
Enrique Gaztanaga,Alberto Lobo
Physics , 2000, DOI: 10.1086/318684
Abstract: We reconsider the problem of gravitational structure formation inside and outside General Relativity (GR), both in the weakly and strongly non-linear regime. We show how these regimes can be explored observationally through clustering of high order cumulants and through the epoch of formation, abundance and clustering of collapse structures, using Press-Schechter formalism and its extensions. We address the question of how different are these predictions when using a non-standard theory of Gravity. We study examples of cosmologies that do not necessarily obey Einstein's field equations: scalar-tensor theories (STT), such as Brans-Dicke (BD), parametrized with $\omega$, a non-standard parametrisation of the Hubble law, $H^2= a^{-3(1+\epsilon)}$, or a non-standard cosmic equation of state $p=\gamma\rho$, where $\gamma$ can be chosen irrespective of the cosmological parameters ($\Omega_M$ and $\Omega_\Lambda$). We present some preliminary bounds on $\gamma$, $\omega$ and $\epsilon$ from observations of the skewness and kurtosis in the APM Galaxy Survey. This test is independent of the overall normalization of rms fluctuations. We also show how abundances and formation times change under these assumptions. Upcoming data on non-linear growth will place strong constraints on such variations from the standard paradigm.
Lisa
J. Alberto Lobo
Physics , 2004,
Abstract: The extreme weakness of the gravitational interaction has as one of its consequences that appreciable intensities of gravitational waves (GW) can only be generated in large size astrophysical and cosmological sources. Earth based detectors face unsurmountable problems to be sensitive to signals at frequencies below 10 Hz due to seismic vibrations. In order to see lower frequency signals, a space based detector is the natural solution. LISA (Laser Interferometer Space Antenna) is a joint ESA-NASA project aimed at detecting GWs in a range of frequencies between 10^{-4} Hz and 10^{-1} Hz, and consists in a constellation of three spacecraft in heliocentric orbit, whose GW-induced armlength variations are monitored by high precision interferometry. This article reviews the main features and scientific goals of the LISA mission, as well as a shorter description of its precursor tecnological mission LPF (LISA Pathfinder).
Hollow sphere, a flexible multimode Gravitational Wave antenna
J. Alberto Lobo
Physics , 2001, DOI: 10.1088/0264-9381/19/7/409
Abstract: Hollow spheres have the same theoretical capabilities as the usual solid ones, since they share identical symmetries. The hollow sphere is however more flexible, as thickness is an additional parameter one can vary to approach given specifications. I will briefly discuss the more relevant properties of the hollow sphere as a GW detector (frequencies, cross sections), and suggest some scenarios where it can generate significant astrophysical information.
The detection of Gravitational Waves
J. Alberto Lobo
Physics , 2002,
Abstract: This chapter is concerned with the question: how do gravitational waves (GWs) interact with their detectors? It is intended to be a theory review of the fundamental concepts involved in interferometric and acoustic (Weber bar) GW antennas. In particular, the type of signal the GW deposits in the detector in each case will be assessed, as well as its intensity and deconvolution. Brief reference will also be made to detector sensitivity characterisation, including very summary data on current state of the art GW detectors.
?Existe relación entre enfermedad cardiovascular y periodontitis?
Tejerina Lobo,J.Ma; Cuesta Frechoso,S.; Menéndez Collar,M.; Sicilia Felechosa,A.;
Avances en Periodoncia e Implantología Oral , 2003, DOI: 10.4321/S1699-65852003000300002
Abstract: the infectious theory to explain atherosclerosis has allowed researchers to advance quickly on the knowledge about pathogenia of cardiovascular disease. even more, the concept of coronary disease as an inflammatory disease has developed new pathways for investigating the ischaemic cardiac. recent investigations suggest that the use of inflammatory markers may help for early detecting patients who present high risk of cardiovascular strokes appearance. also, epidemiological essays have revealed that periodontitis is a risk factor for cardiovascular disease to develop. periodontitis is a source of bacterias or their wastes, and provoke a hyperinflammatory response on the hostage, liberating cytokines for long periods. due to chronicity of both cardiovascular and periodontal disease, they may have some similar ethilogycal ways.
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