Simulation of Dynamic Characteristics of a Trigenerative Climate Control System Based On Peltier Thermoelectric Modules

Vasilyev, G.S.,Kuzichkin, O.R.,Surzhik, D.I. International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.6

The application of the principle of trigeneration allows to simultaneously provide electricity to power electronic devices, as well as heat and cold to create the necessary microclimate of the premises and increase efficiency compared to separate cooling and heating systems. The use of Peltier thermoelectric modules (TEM) as part of trigenerative systems allows for smooth and precise control of the temperature regime, high manufacturability and reliability due to the absence of moving parts, resistance to shock and vibration, and small weight and size parameters of the system. One of the promising areas of improvement of trigenerative systems is their modeling and optimization based on the automatic control theory. A block diagram and functional model of an energy-saving trigenerative climate control system based on Peltier modules are developed, and the transfer functions of an open and closed system are obtained. The simulation of the transient characteristics of the system with varying parameters of the components is performed. The directions for improving the quality of transients in the climate control system are determined, as well as the prospects of the proposed methodology for modeling and analyzing control systems operating in substantially nonlinear modes.

Properties of thermally annealed ruthenium thin films grown on seed layers in a low-temperature selective deposition region

Vladislav Yu. Vasilyev,Yong Won Song,Konstantin P. Mogilnikov 한국물리학회 2009 Current Applied Physics Vol.9 No.2

Resistivity and surface morphology of Ru films have been investigated after Rapid Thermal Processing (RTP) at 400–700 ℃ and conventional long-time anneal (LTA) at 300–500 ℃. Films were grown on sub-nanometer-thick Pt–Pd alloy seed layer in a surface selective growth region at 110–185 ℃ using tricarbonyl{ η4-cyclohexa-1,3-diene}ruthenium, ammonia, nitrous oxide, hydrogen, and pulsed chemical vapor deposition conditions. Film morphology was stable up to 600 ℃ RTP, revealing surface agglomerates at 700 ℃. The resistivity dropped to stable values after ~10 min of LTA, revealing film shrinkage up to 50% and cracks at 1 h of 300–500 ℃ LTA. Both anneal types produced Ru film resistivity ~≼ 40 μΩ cm. Resistivity and surface morphology of Ru films have been investigated after Rapid Thermal Processing (RTP) at 400–700 ℃ and conventional long-time anneal (LTA) at 300–500 ℃. Films were grown on sub-nanometer-thick Pt–Pd alloy seed layer in a surface selective growth region at 110–185 ℃ using tricarbonyl{ η4-cyclohexa-1,3-diene}ruthenium, ammonia, nitrous oxide, hydrogen, and pulsed chemical vapor deposition conditions. Film morphology was stable up to 600 ℃ RTP, revealing surface agglomerates at 700 ℃. The resistivity dropped to stable values after ~10 min of LTA, revealing film shrinkage up to 50% and cracks at 1 h of 300–500 ℃ LTA. Both anneal types produced Ru film resistivity ~≼ 40 μΩ cm.

Study of neutron energy and directional distribution at the Beloyarsk NPP selected workplaces

Pyshkina, Mariia,Vasilyev, Aleksey,Ekidin, Aleksey,Nazarov, Evgeniy,Nikitenko, Vitaly,Pudovkin, Anton Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5

Energy and directional distribution of neutrons at the Beloyarsk NPP workplaces is a subject of this study. Measurements of H^*(10) rate and neutron energy distribution were taken at 8 workplaces, which can be divided into three categories: work with spent or fresh nuclear fuel, work with radionuclide neutron sources, work at the rooms adjusted to reactors. The Hp(10) measurements were performed only at 6 out of 8 locations, due to the fact that long term placing of an effective neutron moderator in fresh nuclear fuel storage facility is forbidden. As a result of the research energy and direction distribution of the neutron fields at 8 locations of the Beloyarsk NPP workplaces was obtained. To estimate the accuracy of the H^*(10) rate and Hp (10) measurements the reference values of dose equivalents were calculated using energy and directional distribution. To take into account the difference between the reference values and the measured results site-specific correction factors were calculated.

Special monitoring results for determination of radionuclide composition of Russian NPP atmospheric releases

Maxim Vasyanovich,Aleksey Vasilyev,Aleksey Ekidin,Ivan Kapustin,Alexander Kryshev 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4

Measurements of activity concentrations of radionuclides in atmospheric releases were performed in2017e2018 at vent stacks of seven Russian nuclear power plants. The selected instruments and researchmethods, with detection limits significantly lower than the existing detection limit of Russian NPPsroutine control, allowed to reliably determine up to 26 radionuclides. Analysis of experimental dataallows to determine the list of radionuclides for calculation the effective dose rates to public and thepermissible annual discharge levels for each Russian NPP. Radiocarbon is determined as majorcontributor for the dose from the atmospheric releases of LWGR reactors e up to 98% for EGP-6 andRBMK-1000 (Smolensk NPP) reactors. For PWR reactors (VVER) radionuclides contribution to the annualdose from atmospheric releases is more complicated, but, in general, dose is formed by tritium, 14C andnoble gases. The special monitoring results with ranking of measured radionuclides according to theircontribution to the effective dose makes it possible to optimize the list of controlled radionuclides inairborne releases of Russian NPPs from 94 to 8e16 for different NPPs.

Adaptation of the parameters of the physical layer of data transmission in self-organizing networks based on unmanned aerial vehicles

Surzhik, Dmitry I.,Kuzichkin, Oleg R.,Vasilyev, Gleb S. International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.6

The article discusses the features of adaptation of the parameters of the physical layer of data transmission in self-organizing networks based on unmanned aerial vehicles operating in the conditions of "smart cities". The concept of cities of this type is defined, the historical path of formation, the current state and prospects for further development in the aspect of transition to "smart cities" of the third generation are shown. Cities of this type are aimed at providing more comfortable and safe living conditions for citizens and autonomous automated work of all components of the urban economy. The perspective of the development of urban mobile automated technical means of infocommunications is shown, one of the leading directions of which is the creation and active use of wireless self-organizing networks based on unmanned aerial vehicles. The advantages of using small-sized unmanned aerial vehicles for organizing networks of this type are considered, as well as the range of tasks to be solved in the conditions of modern "smart cities". It is shown that for the transition to self-organizing networks in the conditions of "smart cities" of the third generation, it is necessary to ensure the adaptation of various levels of OSI network models to dynamically changing operating conditions, which is especially important for the physical layer. To maintain an acceptable level of the value of the bit error probability when transmitting command and telemetry data, it is proposed to adaptively change the coding rate depending on the signal-to-noise ratio at the receiver input (or on the number of channel decoder errors), and when transmitting payload data, it is also proposed to adaptively change the coding rate together with the choice of modulation methods that differ in energy and spectral efficiency. As options for the practical implementation of these solutions, it is proposed to use an approach based on the principles of neuro-fuzzy control, for which examples of determining the boundaries of theoretically achievable efficiency are given.

Exocyst Sec10 protects renal tubule cells from injury by EGFR/MAPK activation and effects on endocytosis

Fogelgren, Ben,Zuo, Xiaofeng,Buonato, Janine M.,Vasilyev, Aleksandr,Baek, Jeong-In,Choi, Soo Young,Chacon-Heszele, Maria F.,Palmyre, Auré,lien,Polgar, Noemi,Drummond, Iain,Park, Kwon Moo,Lazzara American Physiological Society 2014 American Journal of Physiology Vol.307 No.12

<P>Acute kidney injury is common and has a high mortality rate, and no effective treatment exists other than supportive care. Using cell culture models, we previously demonstrated that exocyst Sec10 overexpression reduced damage to renal tubule cells and speeded recovery and that the protective effect was mediated by higher basal levels of mitogen-activated protein kinase (MAPK) signaling. The exocyst, a highly-conserved eight-protein complex, is known for regulating protein trafficking. Here we show that the exocyst biochemically interacts with the epidermal growth factor receptor (EGFR), which is upstream of MAPK, and Sec10-overexpressing cells express greater levels of phosphorylated (active) ERK, the final step in the MAPK pathway, in response to EGF stimulation. EGFR endocytosis, which has been linked to activation of the MAPK pathway, increases in Sec10-overexpressing cells, and gefitinib, a specific EGFR inhibitor, and Dynasore, a dynamin inhibitor, both reduce EGFR endocytosis. In turn, inhibition of the MAPK pathway reduces ligand-mediated EGFR endocytosis, suggesting a potential feedback of elevated ERK activity on EGFR endocytosis. Gefitinib also decreases MAPK signaling in Sec10-overexpressing cells to levels seen in control cells and, demonstrating a causal role for EGFR, reverses the protective effect of Sec10 overexpression following cell injury in vitro. Finally, using an in vivo zebrafish model of acute kidney injury, morpholino-induced knockdown of <I>sec10</I> increases renal tubule cell susceptibility to injury. Taken together, these results suggest that the exocyst, acting through EGFR, endocytosis, and the MAPK pathway is a candidate therapeutic target for acute kidney injury.</P>