AN ENVIRONMENTAL CABINET FOR PLANT RESEARCH UTILIZING SUNLIGHT OR ARTIFICIAL ILLUMINATION

1962 ◽  
Vol 42 (3) ◽  
pp. 510-514 ◽  
Author(s):  
Peter W. Voisey
Keyword(s):  
Light Intensity ◽  
Plant Growth ◽  
Temperature Control ◽  
Electric Heating ◽  
Natural Light ◽  
Artificial Light ◽  
Electronic Temperature ◽  
Maximum Variation ◽  
Artificial Illumination ◽  
Side Walls

To provide both natural light and artificial light for plant growth, a cabinet with glass on the side walls and top was designed for use in a greenhouse. The cabinet measures 5 feet by 7.5 feet and 5 feet high over-all. It has refrigeration cooling, electric heating and electronic temperature controls for a range of 25 to 100°F. Temperature control is regulated at ±0.5°F. while the maximum variation between different locations in the cabinet is ±2°F. Humidity is maintained by a humidifier installed in the cabinet. The light intensity from fluorescent and incandescent bulbs is 2,000 foot-candles in the center of the cabinet.

EXPERIMENTS WITH ARTIFICIAL LIGHT: NECESSITY FOR PROPERLY IDENTIFYING THE SOURCE

1982 ◽  
Vol 114 (4) ◽  
pp. 377-379 ◽  
Author(s):  
Bernard J. R. Philogène
Keyword(s):  
Light Intensity ◽  
Mass Rearing ◽  
Fluorescent Light ◽  
Artificial Light ◽  
Ecological Studies ◽  
Experimental Conditions ◽  
Artificial Illumination

The use of artificial illumination in entomological studies is extensive. Incandescent and fluorescent lights are used in mass-rearing insects necessary for physiological and ecological studies, and in photoperiod-controlled as well as in electrophysiological experiments.One of the main problems facing investigators in the interpretation of their results or in comparing these to preceding reports is the plethora of ways in which experimental conditions involving light are reported. Here are some examples: “The ants were kept under fluorescent light from 0800 to 2000 hours; light intensity on the ants was about 400 lux” (McCluskey 1965).

Effects of light and temperature on nodulation of cowpea and hyacinth bean

1975 ◽  
Vol 85 (3) ◽  
pp. 417-425 ◽  
Author(s):  
A. A. Mahdi ◽  
H. A. Habish
Keyword(s):  
Light Intensity ◽  
Plant Growth ◽  
Moderate Temperature ◽  
Natural Light ◽  
Light Duration ◽  
Reverse Situation ◽  
Hyacinth Bean

SUMMARYCowpea and hyacinth bean nodulated and grew well at 11–14 h and poorly at 8 h light duration. Nodulation and plant growth increased with increase in light intensity from 1·4 to 17·1 W/m2 but the natural light intensity (228·3 W/m2) inhibited nodulation in July and plant growth in December.Nodulation and growth of both crops were best at ‘moderate’ temperature and cowpea tolerated ‘warm’ more than ‘cool’ temperatures whereas hyacinth bean showed the reverse situation.Inoculation improved nodulation of cowpea but not hyacinth bean. Application of nitrogen did not improve the growth of plants affected by light and temperature.

Selection of the Area of Window Openings of Residential Buildings in Conditions of Monsoon Climate of the Far East of the Russian Federation and Northern Areas of China

2019 ◽  
pp. 27-33
Author(s):  
Aleksei K. Solovyov ◽  
Bi Guofu
Keyword(s):  
Residential Buildings ◽  
Russian Far East ◽  
Far East ◽  
Heat Losses ◽  
Natural Light ◽  
Monsoon Climate ◽  
Northern Areas ◽  
Artificial Illumination ◽  
Heat Penetration ◽  
Large Heat

The term “window” in architecture usually stands for an opening in a wall or roof for penetration of natural light, sunrays and fresh air in premises. Recently, the requirement of contact with environment is added to this condition. It is especially relevant for residential buildings where rooms are considered residential if they have windows. The energy consumption of a building depends on sizes, form and location of windows. In winter, windows cause huge heat losses, in summer, on the other hand, large heat enters a building via the windows and is required to be removed by means of air conditioning. Moreover, windows are used for penetration of natural light in premises, which assists in saving of large amounts of power for artificial illumination. This article discusses partial solving the problem of the energy efficiency of residential buildings by determining the most efficient area of windows in terms of energy spending for compensation of heat losses via windows in winter, elimination of heat penetration through them in summer and energy losses for artificial lighting throughout the year. The analysis of the results of calculation of power consumption for residential premises in conditions of monsoon climate of the Russian Far East and Northern areas of China (PRC) is provided.

Further aspects of the artificial illumination of plant growth chambers

1965 ◽  
Vol 10 (3) ◽  
pp. 212-229 ◽  
Author(s):  
G.A. Carpenter ◽  
L.J. Moulsley ◽  
P.A. Cottrell ◽  
R. Summerfield
Keyword(s):  
Plant Growth ◽  
Artificial Illumination ◽  
Growth Chambers

PLANT GROWTH CABINET WITH HOT GAS BYPASS TEMPERATURE CONTROL

1969 ◽  
Vol 49 (1) ◽  
pp. 111-112 ◽  
Author(s):  
K. R. Scott
Keyword(s):  
Plant Growth ◽  
Temperature Control ◽  
Hot Gas

not available

scholarly journals Response of Polycrystalline Solar Cell Outputs to Visible Spectrum and other Light Sources-a Case Study

2018 ◽  
Vol 8 (6) ◽  
pp. 4096
Author(s):  
Ayman Y. Al-Rawashdeh ◽  
Omar Albarbarawi ◽  
Ghazi Qaryouti
Keyword(s):  
Solar Cells ◽  
Visible Spectrum ◽  
Artificial Light ◽  
Light Sources ◽  
Variable Response ◽  
Artificial Illumination ◽  
Different Color ◽  
Color Filters ◽  
Sunlight Radiation

<p>In this case study, two polycrystalline solar modules were installed outdoors (irradiated by sunlight) and indoors (irradiated by artificial lights). The solar cells in both cases were installed using different color filters that allowed the passage of certain light frequencies. The amount of energy produced by each module were measured and compared to a reference module with no filter. The results indicated the variable response of polycrystalline solar cells to natural and artificial light sources, being more responsive in both cases to red band color as could be deduced from their % current outputs (72.5% sunlight radiation; 84.38% artificial light sources). Other colors, including yellow, green, orange and violet afforded acceptable outputs. The results indicated that electrical outputs of indoor solar cells decreased when colored filters were used, but red filter in general afforded the maximum outputs, for both the artificially radiated indoor and naturally radiated outdoor solar cells. The case study suggests the possible complementary advantage of using indoor mounted solar cells for the production of electricity during artificial illumination period of the day.</p>

scholarly journals POLA PEMANGSAAN LARVA IKAN KAKAP MERAH, Lutjanus sebae

2016 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Regina Melianawati ◽  
Philip Teguh Imanto ◽  
Made Suastika
Keyword(s):  
Light Intensity ◽  
Feeding Activity ◽  
Feeding Pattern ◽  
Natural Light ◽  
Digestion Time ◽  
Digestion Rate ◽  
Minimum Light ◽  
Intensity Condition

Penelitian ini bertujuan untuk mengetahui pola pemangsaan dari larva ikan kakap merah, L. sebae umur 5 dan 10 hari yang dipelihara dengan kondisi pencahayaan alami. Pengambilan sampel dilakukan setiap satu jam pada masing-masing umur tersebut. Hasil pengamatan menunjukkan bahwa secara alami pola pemangsaan larva L. sebae tergantung pada kondisi pencahayaan, di mana aktivitas pemangsaan berlangsung secara maksimal pada saat tersedia pencahayaan dengan intensitas yang mencukupi untuk larva menangkap mangsanya. Intensitas cahaya minimal yang diperlukan oleh larva L. sebae untuk melakukan pemangsaan berada pada kisaran 400—600 lux. Maksimal pemangsaan satu larva pada umur 5 dan 10 hari adalah 6,2 dan 25,3 individu rotifer. Lama waktu pencernaan larva umur 5 dan 10 hari adalah 4 dan 5 jam, sedangkan laju cerna larva pada masing-masing umur tersebut adalah 1,50 dan 2,76 individu rotifer per jam.The aim of this research was to get the information about the feeding pattern of emperor snapper L. sebae larvae at 5 and 10 days olds reared under natural light intensity. Larvae samples were taken every hour from each age. The result showed that naturally, feeding pattern of emperor snapper larvae depend on the light intensity condition, feeding activity would be done when the light intensity was enough available for supporting larvae to feed. Minimum light intensity that needed by the larvae for feeding activity was range between 400—600 lux. Maximum feeding per larvae at 5 and 10 days olds were 6.2 and 25.3 individual rotifers. Digestion time of larvae at those ages was 4 and 5 hours, while digestion rate were 1.50 and 2.76 individual rotifers per hour.

scholarly journals Physiological Parameters of Soybean Under Different Intensities of Artificial Light

2019 ◽  
Vol 11 (8) ◽  
pp. 188
Author(s):  
Lucas Aparecido Manzani Lisboa ◽  
Amanda Stelutti ◽  
Karla Caroline Santana Lima ◽  
Guilherme Bandeca Rafachinho ◽  
Renata Alari Chedid ◽  
...  
Keyword(s):  
Light Intensity ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
Physiological Parameters ◽  
Artificial Light ◽  
Gas Analyzer ◽  
Infra Red ◽  
Glycine Max L ◽  
Use Efficiency ◽  
The Ideal

Luminosity and temperature are factors that directly act in photosynthetic process, in which the elevation of the light intensity may provoke reduction in the assimilation of carbon, impairing the development of the soybean culture. This work aimed to know physiological parameters of soybean (Glycine max L. Merr.) under different intensities of artificial light. The experiment was carried out in randomized blocks, in a factorial scheme 2 &times; 5, being two soybean cultivars (Pot&ecirc;ncia and NS6700) and five densities of light: 0 (control), 500, 1000, 1500 and 2000 &mu;mol m-2 s-1 of photosynthetically active radiation (PAR) provided by LED bulbs, with 4 repetitions, in total of 40 plots. The following variables were set: rate of CO2 assimilation (A), transpiration (E), stomatal conductance (gs), inner CO2 concentration in the substomatic chamber (Ci) and water use efficiency (WUE) in which a portable device of gas exchange was used (Infra-Red Gas Analyzer-IRGA, marca ADC BioScientific Ltd, modelo LC-Pro). Seedlings of soybean positively responded under different intensities of artificial light till reach the maximum saturation point between 1400 and 1600 &micro;mol m-1 s-1 of light, which promoted a better rate of A, Ci andWUE. E and gs presented positive linear responses by increasing the intensity of artificial light. The ideal light intensity to the use of Infra-Red Gas Analyzer-IRGA between 1400 and 1600 &micro;mol m-1 s-1 to the soybean culture.

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