Determination of the chlorophyll-a concentration vertical profile by the spectra of incident solar radiation in the ocean

1994 ◽  
Vol 5 (4) ◽  
pp. 287-293
Author(s):  
S. V. Bushnev ◽  
E. V. Myasnikov ◽  
N. B. Nikolaeva ◽  
A. A. Romanov
Keyword(s):  
Solar Radiation ◽  
Chlorophyll A ◽  
Vertical Profile ◽  
Incident Solar Radiation ◽  
Chlorophyll A Concentration

Chlorophyll b Interference in the Fluorometric Determination of Chlorophyll a and 'Phaeo-Pigments'

1979 ◽  
Vol 30 (5) ◽  
pp. 597 ◽  
Author(s):  
CF Gibbs
Keyword(s):  
Chlorophyll A ◽  
Quantitative Estimate ◽  
Aqueous Acetone ◽  
Chlorophyll B ◽  
Fluorometric Determination ◽  
Chlorophyll A Concentration ◽  
Marine Samples ◽  
Water Ratio

A quantitative estimate was made of the interference by chlorophyll b in the fluorometric determination of chlorophyll a using an Aminco-Bowman spectrofluorometer. The undegraded (or 'living') chlorophyll a concentration was underestimated by an amount equal to the concentration of chlorophyll b present. The value for chlorophyll a uncorrected for phaeophytin was increased by 30% of the chlorophyll b concentration. The acetone to water ratio was found to affect the acidification factor only at aqueous acetone concentrations above 90%. The need for standardization of solvent and wavelengths is discussed, and the implications of chlorophyll b occurring in marine samples are considered.

scholarly journals Determining the Optimum Tilt Angles to Maximize the Incident Solar Radiation - Case of Study Pristina

2018 ◽  
Vol 7 (2) ◽  
pp. 123-130 ◽  
Author(s):  
Xhevat Berisha ◽  
Arianit Zeqiri ◽  
Drilon Meha
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Tilt Angle ◽  
Electrical Power ◽  
Incident Solar Radiation ◽  
Flat Surfaces ◽  
Incident Plane ◽  
Energy Gains ◽  
Analysis Models

Solar energy is derived from photons of light coming from the sun in a form called radiation. Solar energy finds extensive application in air and water heating, solar cooking, as well as electrical power generation, depending on the way of capturing, converting and distribution. To enable such application, it is necessary to analyze the horizontal tilt angle of horizontal surfaces – in order that when the solar energy reaches the earth surface to be completely absorbed. This paper tends to describe the availability of solar radiation for south-facing flat surfaces. The optimal monthly, seasonal, and annual tilt angles have been estimated for Pristina. The solar radiation received by the incident plane is estimated based on isotropic sky analysis models, namely Liu and Jordan model. The annual optimum tilt angle for Pristina was found to be 34.7°. The determination of annual solar energy gains is done by applying the optimal monthly, seasonal and annual tilt angles for an inclined surface compared to a horizontal surface. Monthly, seasonal and annual percentages of solar energy gains have been estimated to be 21.35%, 19.98%, and 14.43%. Losses of solar energy were estimated by 1.13 % when a surface was fixed at a seasonal optimum tilt angle, and when it was fixed at an annual optimum tilt angle, those losses were 5.7%.Article History: Received February 15th 2018; Received in revised form May 12th 2018; Accepted June 2nd 2018; Available onlineHow to Cite This Article: Berisha, Xh., Zeqiri, A. and Meha, D.  (2018) Determining the Optimum Tilt Angles to Maximize the Incident Solar Radiation - Case of Study Pristina. Int. Journal of Renewable Energy Development, 7(2), 123-130.https://doi.org/10.14710/ijred.7.2.123-130

scholarly journals Modeling the Incident Solar Radiation of the City of N’Djamena (Chad) by the Capderou Method

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Mahamat Hassane Babikir ◽  
Donatien Njomo ◽  
Mahamat Barka ◽  
Mahamoud Youssouf Khayal ◽  
Deli Goron ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Diffuse Radiation ◽  
Theoretical Models ◽  
African Countries ◽  
Incident Solar Radiation ◽  
Diffuse Solar Radiation ◽  
Different Seasons ◽  
The Moment ◽  
Desert Climate

Chad is like many African countries with no meteorological station at the moment to measure solar radiation throughout the country. Thus, theoretical models are used to estimate incident solar radiation. These models are established in correlation form. Our objective was to present a model, which allows the determination of the solar component on two surfaces (horizontal and inclined). This model allowed us to determine, over time, the component of global, direct, and diffuse solar radiation over a period that will cover the different seasons of the year. The calculation is done according to Klein’s days over all the months of the year. The hourly results of the global, direct, and diffuse radiation obtained for all the planes going from January to December are satisfactory compared to the results of the other authors quoted in the literature, which give the maximum and minimum values very close to theirs. These results allowed us to validate the applicability of this model in a climate other than the desert climate.

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