Search results for " IR"

Intercomparison of spectroradiometers and Sun photometers for the determination of the aerosol optical depth during the VELETA-2002 field campaign

2006

In July 2002 the VELETA-2002 field campaign was held in Sierra Nevada (Granada) in the south of Spain. The main objectives of this field campaign were the study of the influence of elevation and atmospheric aerosols on measured UV radiation. In the first stage of the field campaign, a common calibration and intercomparison between Licor-1800 spectroradiometers and Cimel-318 Sun photometers was performed in order to assess the quality of the measurements from the whole campaign. The intercomparison of the Licor spectroradiometers showed, for both direct and global irradiances, that when the comparisons were restricted to the visible part of the spectrum the deviations were within the instrum…

Column-integrated aerosol optical properties in Sodankylä (Finland) during the Solar Induced Fluorescence Experiment (SIFLEX-2002).

2006

[1] A study has been made of the column aerosols using solar irradiance extinction measurements at ground level in a boreal region (Sodankyla, Finland) during spring 2002. The aerosol properties have been related to air mass origin. In general, the aerosol levels were observed to be very low, independent of the air mass origin, with an aerosol optical depth (AOD) value at 500 nm of less than 0.09 ± 0.03. Two characteristic patterns were observed depending on whether the air masses originated in the north and west or from the south and east. In the first case (north and west origins) the aerosol load was very small, with very low optical depths in the range 0.03 ± 0.02 to 0.09 ± 0.03 for 500…

Summertime columnar content of atmospheric water vapor from ground-based Sun-sky radiometer measurements through a new in situ procedure

2010

[1] A new in situ technique for the retrieval of atmospheric water vapor content (i.e., precipitable water content) from Sun photometric direct solar irradiance measurements, taken at the 940 nm wavelength during clear‐sky conditions, is presented. The procedure is applied to summer data recorded in 2007, 2008, and 2009 with a Sun‐sky radiometer at the San Pietro Capofiume station in the Po valley, Italy. It is a preliminary development of the retrieval procedure providing the columnar water vapor content from measurements performed with PREDE Sun‐sky radiometers. The technique brings improvement and innovation by retrieving the best values of constants (a and b), characterizing atmospheric…

The erythemal clearness index for Valencia, Spain

2009

The values of three clearness indices have been measured for the city of Valencia: kt, the clearness index for the whole solar spectrum, ktUV the clearness index for the ultraviolet range, and the erythemal clearness index for the erythemal radiation ktUVER, corresponding to the solar radiation weighted by the erythemal action spectrum on human skin, normalized with respect to the solar constant corresponding to that spectrum. The measurements of ktUV reached values that were approximately 54% of that corresponding to kt, while those of ktUVER were much smaller. Some statistics of the erythemal clearness index have been calculated both for monthly as well as hourly means. The shape of the d…

Intercomparison of spectroradiometers for global and direct solar irradiance in the visible range.

2003

This paper presents the results of the analysis of the spectral, global, and direct solar irradiance measurements in the visible range (400–700 nm) that were made in the framework of the first Iberian UV–visible (VIS) instruments intercomparison. The instruments used in this spectral range were four spectroradiometers: three Licor 1800s equipped with different receiver optics and one Optronic 754. For the direct solar irradiance measurements the spectroradiometers were equipped with collimators with different fields of view. Parallel studies have been carried out with the data given by the spectroradiometers with their original calibration file and with the same data that is corrected, foll…

Spectral surface albedo over Morocco and its impact on radiative forcing of Saharan dust

2011

In May–June 2006, airborne and ground-based solar (0.3–2.2 μm) and thermal infrared (4–42 μm) radiation measurements have been performed in Morocco within the Saharan Mineral Dust Experiment (SAMUM). Upwelling and downwelling solar irradiances have been measured using the Spectral Modular Airborne Radiation Measurement System (SMART)-Albedometer. With these data, the areal spectral surface albedo for typical surface types in southeastern Morocco was derived from airborne measurements for the first time. The results are compared to the surface albedo retrieved from collocated satellite measurements, and partly considerable deviations are observed. Using measured surface and atmospheric prope…

Baltu filoloģija, 23. sēj., Nr.2

2015

Sapieżyńska ochrona dóbr Potockich w starostwie owruckim w latach 80. i 90. XVII wieku Przyczynek do badań nad współpracą rodzin magnackich w czasach…

2019

The Sapiehas and the Potockis were amongst the most influential families of the Polish‑Lithuanian Commonwealth. The latter family owned numerous estates in Ukraine, which were directly under threat from marching Lithuanian soldiers. Kazimierz Jan Sapieha, Grand Hetman of Lithuania was in charge of the said estates. Due to cooperation of the two magnate families, he attempted to shield the Potockis’ estates and possessions from Lithuanian troops marching to or returning from the war with Turkey. To that aim he utilised legal proclamations called Universals. The Potockis returned the favour by entering into political collaboration. Hetman Kazimierz Jan Sapieha, having been absent from the Sie…

Il bambino “sovrano” e l’adulto “irrisolto”. Tempi di crescita familiare ed educazione

2019

“Sovereign” child, apathetic adolescents, kidult, young adult, “unresolved” adult, forms of “pseudo-integrity” of the elderly are some expressions that show phenomena that are radically changing, along with the identity of the family, times of growth of the different generations, and the sense of belonging to a historical community. Profound transformations involved in the transitions of the family life cycle are also visible in the disappearance of some phases of family growth in favor of others. Through a pedagogical reflection on these phenomena, this contribution aims to underline some aspects of the ways of understanding education and growth in the family of late modernity, for the pur…

Some aspects regarding the static behavior of basalt in the machine building industry

2017

Basalt is a material available in big quantities in nature. It has a low price and can be used in various domains. It can be relatively easily extracted from natural deposits and processed by means of melting. Melted and recrystallized basalt has demonstrated promising behavior with regards of its use in manufacturing, as reported in the literature. This work aims to present some aspects regarding the opportunity of using basalt in manufacturing the subassemblies of machine-tools. The research was made using grey cast iron and steel parts as reference for a comparative study. The researches presented in this work were focused on analyzing the behavior of basalt parts submitted to static str…