26 research outputs found
Concept and development of an autonomous wearable micro-fluidic platform for real time pH sweat analysis
No full textIn this work the development of an autonomous, robust and wearable micro-fluidic platform capable of performing on-line analysis of pH in sweat is discussed. Through the means of an optical detection system based on a surface mount light emitting diode (SMD LED) and a light photo sensor as a detector, a wearable system was achieved in which real-time monitoring of sweat pH was performed during 55 minutes of cycling activity. We have shown how through systems engineering, integrating miniaturised electrical components, and by improving the micro-fluidic chip characteristics, the wearability, reliability and performance of the micro-fluidic platform was significantly improved
Providing of Surfaces’ Geometry at the Design Stage of Profile Milling Operation of Off-Grade Workpiece
No full textIncrease of energy efficiency of the extraction process
No full textAt present, there is a tendency to use drugs based on medicinal plants instead of synthetic drugs. And the main advantage is the possibility of using wood waste in the form of bark, leaves and kidneys, since these parts of the trees are waste in production. Studies on the extraction of wood waste have been carried out. On the basis of the data obtained, the hardware design of increased energy efficiency was developed through the use of a heat pump
Convectiv drying of disperesd materials before the thermochemical processing
No full textDrying of wood materials is one of the most important processes not only of wood processing, but also of many other industries. Drying processes involve the removal of moisture as a result of a phase transition from a liquid or solid to a gaseous state. This is due to the high energy intensity and duration of the process, especially for colloidal materials. The latter is due to the fact that with intensive drying the quality of the finished product often decreases, for example, when drying lumber cracks and warps occur, which is unacceptable in the manufacture of thermally modified products. In cases of thermochemical processing of dispersed materials, the quality of raw materials is determined only by the final moisture content of dispersed materials.Questions of heat and mass transfer during the drying of materials were carried out by Girsh M., Lykov A.V., Lurye M.V., Sazhin B.S., Dolinsky A.A., Golubev L.G., Rudobashta S.P., Shubin G.S., Romankov PG, Ginzburg A.S., Mikhailov N.V., Mushtayev VI. and etc. The paper deals with convective technology of dispersive materials. The zone of convective drying of dispersed materials is presented. Experimental and mathematical modeling of the drying process of wet dispersed materials before thermochemical processing was carried out. The results of theoretical and experimental studies of changes in temperature and humidity in the drying bin are presented. The nature of changes in temperature and humidity of dispersed particles in a drying bin was determined. The effective height of the layer in the counter-current dryer is determined by calculation, depending on the moisture content of the fuel and the temperature of the exhaust flue gases
Contemporary state of production of wood coal
No full textThe article deals with the properties of coal and the field of application, the development of technology for the production of charcoal, and also the installation for the processing of timber materials of the timber industry. A description of the technology and instrumentation of the process of wood waste in a continuously operating vertical retort is presented
Simulation of the effectiveness of longitudinal rectangular fins on the efficiency of the double pipe heat exchanger
No full textIn this article, a mathematical simulation of a double pipe heat exchanger is carried out, having the longitudinal rectangular fins with the dimension of (2*3*1000) mm, mounted on the outer surface of the inner tube of the heat exchanger. In this paper, the advantage of using of that type of fins and its effect on the effectiveness of the heat exchanger are studied with the help of the computer program. The carried out research allowsmaking the calculation to find the optimum design parameters of heat exchangers. The outer tube diameter is (34.1mm) while the inner tube diameter is (16.05mm). The tubes wall thickness is (1.5mm) and the model length was (1 m). The hot water is flowing through the inner tube in parallel with the cold water that passing the outer tube. The hot and cold water temperature at the inlet is (75°C & 30°C) respectively. The mass flow rate inside the central pipe is (0.1 kg/s) while the annular pipe carrying (0.3 kg/s). In the present work, the program ANSYS Workbench 15.0 was used to find out the results of heat transfer as well as the behavior of liquids inside the heat exchangers
Application of software solutions for modeling and analysis of parameters of belt drive in engineering
No full textSafety and security
No full textThis paper is the sixth in a series of 8 that make up the evidence base for SDC report 'The role of nuclear power in a low carbon economy'.The document covers accident risk in plants (including a historical review of accidents), threats from design faults and terrorism, the implications of nuclear proliferation, and health impacts.Publisher PD
