有關(guān)led的畢業(yè)論文外文翻譯--高亮高效節(jié)能led燈的來源及其在室內(nèi)植物栽培中的潛力

1、1中文 中文 7600 字出處： 出處：Renewable and Sustainable Energy Reviews 13 (2009) 2175–2180Renewable and Sustainable Energy ReviewsHigh-brightness LEDs—Energy efficient lighting sources and their potential in indoor plant cultivati

2、onNaichia Yeh a, Jen-Ping ChungABSTRACTThe rapid development of optoelectronic technology since mid-1980 has significantly enhanced the brightness and efficiency of light-emitting diodes (LEDs). LEDs have long been propo

3、sed as a primary light source for space-based plant research chamber or bioregenerative life support systems. The raising cost of energy also makes the use of LEDs in commercial crop culture imminent. With their energy

4、efficiency, LEDs have opened new perspectives for optimizing the energy conversion and the nutrient supply both on and off Earth. The potentials of LED as an effective light source for indoor agriculturalproduction have

5、been explored to a great extent. There are many researches that use LEDs to support plant growth in controlled environments such as plant tissue culture room and growth chamber. This paper provides a brief development h

6、istory of LEDs and a broad base review on LED applications in indoor plant cultivation since 1990.Contents1. Introduction 2. LED development.3. Color ratios and photosynthesis 4. LEDs and indoor plant cultivation.4.1. Pl

7、ant tissue culture and growth 4.2. Space agriculture8 4.3. Algaculture4.4. Plant disease reduction 5. Intermittent and photoperiod lighting and energy saving6. Conclusion1. IntroductionWith impacts of climate change, iss

8、ues such as more frequent and serious droughts, floods, and storms as well as pest and diseases are becoming more serious threats to agriculture. These threats along with shortage of food supply make people turn to ind

9、oor and urban farming (such as vertical farming) for help. With proper lighting, indoor agriculture eliminates weather-related crop failures due to droughts and floods to provide year-round crop production, which assis

10、t in supplying food in cities with surging populations and in areas of severe environmental conditions.3Fig.1LED development began with infrared and red devices made with gallium arsenide. Advances in materials science h

11、ave made possible the production of devices with ever-shorter wavelengths, producing light in a variety of colors. J.Margolin reported that the first known light-emitting solid state diode was made in 1907 by H. J. Roun

12、d. No practical use of Round’s diode was made for several decades until the invention of the first practical LED by Nick Holonyak, Jr in 1962. His LEDs became commercially available inlate 1960s. These GaAsP LEDs combi

13、ne three primary elements: gallium, arsenic and phosphorus to provide a 655nm red light with brightness levels of approximately 1–10 mcd at 20mA. As the luminous intensity was low, these LEDs were only used in a few app

14、lications, primarily as indicators. Following GaAsP, GaP (gallium phosphide) red LEDs were developed. These device sex hibit very high quantum efficiencies at low currents. As LED technology progressed through the 1970s

15、, additional colors and wavelengths became available. The most common materials were GaP green and red, GaAsP orange, and high efficiency red and GaAsP yellow. The trend towards more practical applications (such as in

16、calculators, digital watches, and test equipment) also began to develop. As the LED materials technology became more advanced, the light output was increased, and LEDs became bright enough to be used for illumination.In