Volumen 24, Número 1https://hdl.handle.net/10669/146082024-03-29T12:59:09Z2024-03-29T12:59:09ZAlgunas características de las mareas en la costa Pacífica y Caribe de Centroaméricahttps://hdl.handle.net/10669/767652022-05-17T21:27:25Z2006-01-01T00:00:00ZAlgunas características de las mareas en la costa Pacífica y Caribe de Centroamérica
Tidal levels were studied in 48 stations using tidal predictions along the coasts
of the Pacific and Caribbean of Central America. Statistics of basic mean values
were analyzed to characterize the stations. These values are useful in coastal
design structures as marines, ports, breakwaters, and for planning of marine
operations in ports and piers. The tidal wave in the Pacific is simidiurnal, while
in the Caribbean varies according to the latitude and the bathymetric basin in
which it is found. In this last region the tidal wave can be mixed (a combination
of semidiurnal and diurnal types) or semidiurnal pure. Some stations may show
seasonal variations in the tidal wave according to the phases of the moon. It was
found that the stations positioned in open coasts in the Pacific Ocean had smaller
tidal range than those stations inside of semi-enclosed bodies of waters as bays
and gulfs. Some stations in the interior of the Gulf of Panama showed very high
tidal ranges associated possibly to resonance interactions of the tidal wave with
the continental shelf and the geometry of the gulf. In the Caribbean Sea the tides
seemed to resonance according to the basin and sea floor batimetry in which
they are found. In some stations the oceanic and atmospheric forces as wind,
atmospheric pressure, waves and currents, might generate the so called “weather
tides” that could explain the major tidal range found in some of them.
2006-01-01T00:00:00ZCurvatura en teorías generalizadas de Yang-Millshttps://hdl.handle.net/10669/146142021-05-04T19:16:51Z2009-01-13T00:00:00ZCurvatura en teorías generalizadas de Yang-Mills
The curvature in R1+3 spaces with a generalized Yang-Mills connection is studied and the results are analyzed. Other options borne by modifications of the base space are also studied and commented. The present situation of the problem is reviewed.
2009-01-13T00:00:00ZLas cuerdas magnéticashttps://hdl.handle.net/10669/146132021-05-04T19:16:51Z2009-01-13T00:00:00ZLas cuerdas magnéticas
The conception of the magnetic string is presented; it is an infinitely thin bundle of magnetic flux lines. They are surrounded by a film of current that rotates around them, and are a solution of Maxwell’s equations. Their magnetic potentialcontains a line singularity, and its stability can be established topologically. A few comments are added on the possibility that they may exist at a cosmological scale as relics of the Big Bang.
2009-01-13T00:00:00ZMonitoreo ambiental con detectores termoluminiscentes en Costa Ricahttps://hdl.handle.net/10669/146102021-05-04T19:16:51Z2009-01-13T00:00:00ZMonitoreo ambiental con detectores termoluminiscentes en Costa Rica
Using thermoluminiscent dosimeters (Harshaw TLD-200) the first set of Costa Rica data on absorbed doses in air from natural radiation is obtained. During the period September 1996 through October 2000 eight different sites throughout the country were chosen to install the TLD stations. Each station had 8 cards (five were changed every 3 months and 3 were changed annually). The dosimeters were read in the Atomic, Nuclear and Molecular Research Center using a 4000 Harshaw reader. Through a mathematical algorithm and its calibration factors the absorbed dose rate in air (nGy. h-1) was calculated. The national average is 108.9 ± 32.4 nGy.h-1, the lowest values (in nGy.h-1) were obtained at sea level at Quebrada Honda with 53 ± 11 and the highest values (in nGy.h-1) at Cartago with 160 ± 19. A slight increase with altitude is observed even though the Cartago station was always the highest. The values found agree with values reported worldwide.
2009-01-13T00:00:00Z