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Morozyuk Larisa,Sokolovska-Yefymenko Viktoriia,Moshkatiuk Andrii,Ierin Volodymyr,Basov Anatolii 대한설비공학회 2023 International Journal of Air-Conditioning and Refr Vol.31 No.1
The paper presents the results of a theoretical and experimental study aimed at improving the efficiency of commercial refrigeration systems and taking into account the external negative impact on heat transfer and aerodynamics of an air-cooled condenser. The issues of the impact of solid fouling on the outer heat transfer surface of the air-cooled condenser as a factor that worsens its energy efficiency and operational reliability have been studied. A small-scale commercial refrigeration machine has been used for carrying out the study. To create external real conditions in the experimental bench, a climatic chamber and a thermostatic chamber are provided. Three types of solid fouling have been used: dust, fluff, and sand. The fouling has been collected from real operating air-cooled condensers which are identical to the experimental heat exchanger. The experimental study has been carried out with a variable mass of fouling, which made it possible to simulate various real operating conditions for the air-cooled condenser. As a result of the experiment, it has been found that out of a set of fouling roadsides, the dust has the greatest negative impact on the characteristics of the refrigeration machine as a whole, and sand has the greatest negative effect on the internal characteristics of the air-cooled condenser. Recommendations are made to determine the moment of cleaning the surface of the air-cooled condenser based on energy-saving parameters. It is proposed to fix the moment of cleaning using computer software using the permissible air mass velocity as a key parameter and the refrigeration machine operation interval under this condition.
Inhomogeneous electronic state near the insulator-to-metal transition in the correlated oxideVO2
Frenzel, A.,Qazilbash, M. M.,Brehm, M.,Chae, Byung-Gyu,Kim, Bong-Jun,Kim, Hyun-Tak,Balatsky, A. V.,Keilmann, F.,Basov, D. N. American Physical Society 2009 Physical review. B, Condensed matter and materials Vol.80 No.11
Driscoll, T.,Kim, H.-T.,Chae, B.-G.,Kim, B.-J.,Lee, Y.-W.,Jokerst, N. M.,Palit, S.,Smith, D. R.,Di Ventra, M.,Basov, D. N. American Association for the Advancement of Scienc 2009 Science Vol.325 No.5947
<P>The resonant elements that grant metamaterials their distinct properties have the fundamental limitation of restricting their useable frequency bandwidth. The development of frequency-agile metamaterials has helped to alleviate these bandwidth restrictions by allowing real-time tuning of the metamaterial frequency response. We demonstrate electrically controlled persistent frequency tuning of a metamaterial, which allows the lasting modification of its response by using a transient stimulus. This work demonstrates a form of memory capacitance that interfaces metamaterials with a class of devices known collectively as memory devices.</P>
Infrared probe of the bulk insulating response inBi2−xSbxTe3−ySeytopological insulator alloys
Post, K. W.,Lee, Y. S.,Chapler, B. C.,Schafgans, A. A.,Novak, Mario,Taskin, A. A.,Segawa, Kouji,Goldflam, M. D.,Stinson, H. T.,Ando, Yoichi,Basov, D. N. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.91 No.16
Infrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide
Qazilbash, M. M.,Brehm, M.,Andreev, G. O.,Frenzel, A.,Ho, P.-C.,Chae, Byung-Gyu,Kim, Bong-Jun,Yun, Sun Jin,Kim, Hyun-Tak,Balatsky, A. V.,Shpyrko, O. G.,Maple, M. B.,Keilmann, F.,Basov, D. N. American Physical Society 2009 Physical review. B, Condensed matter and materials Vol.79 No.7