Statistical Study of Brazilian Solarimetric Measurements and Comparison with Satellite Models for Eventual Use in Feasibility Studies of Photovoltaic Solar Generation

Author(s):  
Marco Antonio Haikal-Leite ◽  
Andre de Oliveira Dias ◽  
Anna Carolina de P. Sermarini ◽  
Luis Fernando Mendonca Frutuoso ◽  
Eloi Fernandez y Fernandez
1976 ◽  
Vol 32 ◽  
pp. 675-683
Author(s):  
Keiichi Kodaira

SummaryExcess of [m1] index of Am stars, relative to normal stars, is statistically found to be correlated with rotation velocity; the coefficient is estimated at ∆׀m1׀ /∆V(km/sec) ˜ - 0.0007 among Am stars. This result supports the general view that slow rotation is essential for Am phenomena.


Skull Base ◽  
2009 ◽  
Vol 19 (01) ◽  
Author(s):  
Mario Giordano ◽  
Wolf Luedemann ◽  
Lennart Stieglitz ◽  
Karsten Wrede ◽  
Laura Columbano ◽  
...  

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 20-26 ◽  
Author(s):  
PEEYUSH TRIPATHI ◽  
MARGARET JOYCE ◽  
PAUL D. FLEMING ◽  
MASAHIRO SUGIHARA

Using an experimental design approach, researchers altered process parameters and material prop-erties to stabilize the curtain of a pilot curtain coater at high speeds. Part I of this paper identifies the four significant variables that influence curtain stability. The boundary layer air removal system was critical to the stability of the curtain and base sheet roughness was found to be very important. A shear thinning coating rheology and higher curtain heights improved the curtain stability at high speeds. The sizing of the base sheet affected coverage and cur-tain stability because of its effect on base sheet wettability. The role of surfactant was inconclusive. Part II of this paper will report on further optimization of curtain stability with these four variables using a D-optimal partial-facto-rial design.


2020 ◽  
pp. 85-88 ◽  
Author(s):  
Nadezhda P. Kondratieva

The article describes the results of the study concerning the effect of the voltage level on current harmonic composition in greenhouses irradiators. It is found that its change affects the level of current harmonics of all types of the studied greenhouse irradiators. With decrease of nominal supply voltage by 10 %, the total harmonic distortion THDi decreases by 9 % for emitters equipped with high pressure sodium lamps (HPSL), by 10 % for emitters with electrode-less lamps and by 3 % for LED based emitters. With increase of nominal supply voltage by 10 %, THDi increases by 23 % for lighting devices equipped with HPSL, by 10 % for irradiators with electrode-less lamps and by 3 % for LED based emitters. Therefore, changes of supply voltage cause the least effect on the level of current harmonics of LED based emitters and then the emitters with electrode-less lamps. Change of the level of supply voltage causes the greatest effect on the level of current harmonics of HPSL based irradiators. Mathematical models of dependence of THDi on the level of supply voltage for greenhouse emitters equipped with LED, electrode-less lamps and HPSL lamps were formulated. These mathematical models may be used for calculations of total current when selecting transformers and supply cable lines for greenhouse lighting devices, for design of new or reconstruction of existing irradiation systems of greenhouse facilities, and for calculation of power losses in power supply networks of greenhouse facilities during feasibility studies for energy saving and energy efficiency increasing projects.


2020 ◽  
Vol 11 (3) ◽  
pp. 145-153
Author(s):  
Yongyan Zhu ◽  
Hyunchan Sung ◽  
Yoonji Kim ◽  
Sunghoon Cha ◽  
Seongwoo Jeon

1980 ◽  
Vol 42 (4) ◽  
pp. 665-669 ◽  
Author(s):  
Satoshi DEKIO ◽  
Yoshiko MAEHAMA ◽  
Reiko YAMASAKI ◽  
Kazuko HAMANAKA ◽  
Sanae IKEDA

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