In conventional vapor compression systems, electronic expansion valves (EXVs) are used for refrigerant flow control. Subcooled refrigerant enters the expansion device and is expanded to the evaporation pressure while the valve opening is modified to achieve the desired mass flowrate. The relationship between the inlet and outlet conditions, the opening, and the mass flowrate has been extensivel...

Medical applications are among the most impactful areas of microrobotics. The ultimate goal of medical microrobots is to reach currently inaccessible areas of the human body and carry out a host of complex operations such as minimally invasive surgery (MIS), highly localized drug delivery, and screening for diseases at their very early stages. Miniature, safe and energy efficient propulsion sys...

A water model with a low temperature (-170 ) gas blow °C -in system was established to simulate the phenolmena inside a steelmaking furnace, to investigate the effects of gas bottom blowing conditions on the shape and dimensions of the mushroom formation, sitting on the gas tuyeres. It was observed that ice mushroom formations in the shape of cones with hollow channels for gas flow through were...

this paper gives a short survey of some of the known results generalizing the theorem, credited to i. schur, that if the central factor group is finite then the derived subgroup is also finite.

A dimensional analysis of an ultraviolet germicidal irradiation (UVGI) air disinfection system within a diffusely reflective enclosure is performed using the Buckingham pi theorem. The eight dimensionless parameters obtained include the duct aspect ratio, the lamp aspect ratio, the reflectivity, and terms that incorporate the UV dose, airflow, duct dimensions, and lamp location coordinates. Com...

Dimensional Analysis is a well-established modeling technique which employs domain knowledge in form of the physical dimensions of the model parameters. Based on the principle of dimensional homogeneity, the physical dimension information about the model parameters is used to reduce the combinatorial complexity in the search for the correct model. Due to the philosophical foundation of the homo...

in this paper, after reviewing some results in minimal space, some new results in this setting are given. we prove a generalized form of the fan-kkm typetheorem in minimal vector spaces. as some applications, the open type of matching theorem and generalized form of the classical kkm theorem in minimal vector spaces are given.

a CSERGE, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK b Fauna & Flora International, 14 Buckingham Street, London, WC2N 6DF, UK c Department of Land Economy, University of Cambridge, 19 Silver Street, Cambridge, CB3 9EP, UK d Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK e Department of Biology, University of Copenha...

Hyaline membrane disease of the newborn has been a subject of ever-growing interest to paediatricians and pathologists as it is the major cause of death in newborn babies, particularly premature ones. Much more is known of the clinical picture and physiological changes in hyaline membrane disease, or respiratory distress syndrome of the newborn (Avery, 1962; Curtis, 1957; James, 1959; Miller, 1...