The use of LEDs in lamps is promising for effective plant growth. Plant growth lamps are designed to create artificial lighting for agricultural crops. This work is devoted to the creation of a smart LED lamp with the ability to adjust the spectral composition of radiation depending on the stage of growth and the type of plant. A number of experiments were carried out to investigate the effect of various radiation parameters on the growth characteristics of dill, parsley, green onion and cucumber seeds. The optimal radiation parameters that contribute to the acceleration of the selected model plants growth were identified. Based on the results obtained, a multi-wavelength LED lamp with an adjustable radiation composition, including blue 440 nm and red 660 nm LEDs, was developed. In the lamp, the possibility of changing the spectral composition of radiation at different stages of growth was realized. Therefore, it is possible to change the light parameters in accordance with the obtained data on the development of crops.
The necessity to control the feed water state in the second loop of a nuclear power plant nuclear reactor is justified. The different methods of the state control of flowing water in the pipeline are reviewed. It has been established that controlling the feed water state should not result in irreversible changes in its chemical composition and physical structure. A change in the composition or structure of feed water leads to a change in its heat capacity. The heat transfer deteriorates, the production of electrical energy in the installation decreases, and the additional release of heat into the atmosphere increases. This process also occurs during the heat capacity changes for other reasons. The method for controlling the feed water heat capacity by measuring the value of the refractive index n is developed. The design of a flow-through refractometer based on the total internal reflection for control of the feed water state in the stream is made. The dependence of the heat capacity change of feed water from the refractive index is established. The results of research on different types of water are presented.
The article considers the use of an intelligent lighting control system as one of the ways to reduce the negative impact of electromagnetic radiation in the visible range on the human visual organs. The developed algorithm of the system determines the most optimal value of the voltage on the lighting elements based on the comparison of the data on the value of illumination in different areas of the room, providing not only a comfortable environment for the eyes in the workplace, but also an electric energy saving of at least 15 %.
The article discusses the development and advantages of an optical system for lighting rooms with biologically safe and environmentally friendly sunlight. A passive system that does not consume energy is proposed. The analysis of artificial light sources by their spectral composition is carried out. It was found that the spectral composition most suitable for a comfortable human condition is an incandescent lamp, which has several limitations. It is established that the most environmentally friendly and safe solution is the use of sunlight. An energy-efficient natural light system has been developed, creating a comfortable environment for the eyes, well-being, and mood of a person.
The article shows the need for efficient use of electric energy in order to preserve the resources and environmental health of the planet. The necessity of the modernization of existing systems control the ambient light in the area of jobs solution to the problems of ecology eyes. The method of control and adjustment of illumination of workplaces and zones where it, is necessary is offered. A control system using the optical Internet has been developed. The simulation of the system operation was carried out, the possible amounts of saving electric energy, natural resources and reducing the negative impact on the environment were determined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.