265 resultados para meridian


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specially prepared for the Foreign Department, from India ; published under direction of Colonel F. B. Longe, R. E., Surveyor General of India.

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describebat Abrah. Ortelius.

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nach dessen Originalskizzen redigirt von H. Kiepert.

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Suspended matter concentration along a meridian section from the Lena River delta to 78°N (~500 km) at ten stations from the surface to the bottom was studied with weight and optical (light attenuation index) techniques. At seven stations average residence time of suspended matter in surface waters was determined by the disequilibrium 234Th method. Average residence time of suspended matter in other depth intervals was calculated by regression dependence between the 234Th/238U ratio and suspended matter concentration. Differential and integral fluxes of suspended matter in the water column were also calculated. Nepheloid matter dominates in suspended matter composition in surface waters. Calculations indicate that, before being buried on the bottom, solid river run-off is resuspended 2.3 times (aver.). Redistribution of nepheloid suspended matter in the near-bottom layer results in formation of a strongly pronounced depocentre - an area of maximal discharge of solid river run-off within the Laptev Sea.

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The success of any efforts to determine the effects of climate change on marine ecosystems depends on understanding in the first instance the natural variations, which contemporarily occur on the interannual and shorter time scales. Here we present results on the environmental controls of zooplankton distribution patterns and behaviour in the eastern Weddell Sea, Southern Ocean. Zooplankton abundance and vertical migration are derived from the mean volume backscattering strength (MVBS) and the vertical velocity measured by moored acoustic Doppler current profilers (ADCPs), which were deployed simultaneously at 64°S, 66.5°S and 69°S along the Greenwich Meridian from February, 2005, until March, 2008. While these time series span a period of full three years they resolve hourly changes. A highly persistent behavioural pattern found at all three mooring locations is the synchronous diel vertical migration (DVM) of two distinct groups of zooplankton that migrate between a deep residence depth during daytime and a shallow depth during nighttime. The DVM was closely coupled to the astronomical daylight cycles. However, while the DVM was symmetric around local noon, the annual modulation of the DVM was clearly asymmetric around winter solstice or summer solstice, respectively, at all three mooring sites. DVM at our observation sites persisted throughout winter, even at the highest latitude exposed to the polar night. Since the magnitude as well as the relative rate of change of illumination is minimal at this time, we propose that the ultimate causes of DVM separated from the light-mediated proximal cue that coordinates it. In all three years, a marked change in the migration behaviour occurred in late spring (late October/early November), when DVM ceased. The complete suspension of DVM after early November is possibly caused by the combination of two factors: (1) increased availability of food in the surface mixed layer provided by the phytoplankton spring bloom, and (2) vanishing diurnal enhancement of the threat from visually oriented predators when the illumination is quasi-continuous during the polar and subpolar summer. Zooplankton abundance in the water column, estimated as the mean MVBS in the depth range 50-300 m, was highest end of summer and lowest mid to end winter on the average annual cycle. However, zooplankton abundance varied several-fold between years and between locations. Based on satellite and in situ data of chlorophyll and sea ice as well as on hydrographic measurements, the interannual and spatial variations of zooplankton mean abundance can be explained by differences in the magnitude of the phytoplankton spring bloom, which develops during the seasonal sea ice retreat. Whereas the vernal ice melt appears necessary to stimulate the blooming of phytoplankton, it is not the determinator of the blooms magnitude, its areal extent and duration. A possible explanation for the limitation of the phytoplankton bloom in some years is top-down control. We hypothesise that the phytoplankton spring development can be curbed by grazing when the zooplankton had attained high abundance by growth during the preceding summer.

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Includes bibliography.

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"LA-11066-MS ... UC-66."

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“Autonomous Sensory Meridian Response” (ASMR) is a term that has emerged online to describe a mysterious tingling sensation that some people experience in response to particular audiovisual and interpersonal “triggers.” Initially coalescing via discussion threads on health forums, ASMR culture quickly began using platforms like YouTube and Reddit to exchange trigger videos. This paper frames the emergence of ASMR video culture as an example of how bodies and algorithms are conspiring to bring into being new cultural forms that can seem literally inexplicable on first encounter. Treating videos as “inputs,” judged not as messages to be understood or interpreted but by their ability to elicit particular affective and somatic “outputs,” ASMR communities cultivate a quasi-cybernetic relationship with the moving image, using video as a vehicle for “feeling out” phenomena that seem to thwart linguistic articulation and rational comprehension.

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v. 1. pt. 1. Personal account. General description of the country. Lower Rio Bravo. From mouth of Devil's river to El Paso del Norte. Sketch of territory acquired by treaty of Dec. 30, 1853. From the 111th meridian of longitude to the Pacific ocean; Report of Lieut. Michler. Astronomical and geodetic work. Meteorology. pt. 2. Geological reports of Dr. C. C. Parry and assistant Arthur Schott. Notes by W. H. Emory. Paleontology and geology of the boundary, by

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"This publication supersedes 'Insect enemies of the [i.e. of] Eastern forests, ' Miscellaneous publication no. 657."

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"January 14, 1994."

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"Preliminary to the full report in the quarto series, vol. V, Zoology. The list of birds of Utah ... by Mr. Henshaw, appeared as a separate paper in the Annals of the Lyceum of natural history of New York, vol. xi, June, 1874."

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v. 9. Off on a comet. The underground city.--v. 10. Dick Sands: A captain at fifteen. The dark continent. Measuring a meridian.--v. 11. The five hundred millions of the begum. The tribulations of a Chinaman in China. The giant raft: Eight hundred leagues on the Amazon.--v. 12. The giant raft: The cryptogram. The steam house: The demon of Cawnpore. Tigers and traitors.--v. 13. The Robinson Crusoe school. The star of the south. Purchase of the North pole.--v. 14. Robur the conqueror. The master of the world. The sphinx of ice.--v. 15. The exploration of the world: The world outlined. Seekers and traders. Scientific exploration.