In this paper, the physical processes that govern the operation of a passive acoustic transducer are analyzed and modelled. The wireless battery-free transducer derives its power from an externally applied electromagn...
In this paper, the physical processes that govern the operation of a passive acoustic transducer are analyzed and modelled. The wireless battery-free transducer derives its power from an externally applied electromagnetic field generated by a radio transmitter. The audio signal is encoded in the backscattered electromagnetic field. Electro-Mechano-Acoustical analogies are developed and presented. Power generation, sound transduction and radio frequency backscatter transmission of the audio signal are examined. The resonant frequency of the passive acoustic transducer derived from this analysis is similar to other resonant frequencies reported in the literature.
Nowadays, Smart Grids (SG) and Microgrids (MG) achieve optimum and reliable integration of Distributed Generation (DG) units in the existing electricity distribution network. An AC/DC hybrid MG system is proposed in t...
Nowadays, Smart Grids (SG) and Microgrids (MG) achieve optimum and reliable integration of Distributed Generation (DG) units in the existing electricity distribution network. An AC/DC hybrid MG system is proposed in this paper in order to integrate the Photovoltaic (PV) home system, Micro Combined Heat and Power (mCHP) units with the appropriate size, a Boiler and Batteries within the power infrastructure. Furthermore, three different types of consumers with large, medium and small electrical and thermal demands are examined. The purpose of this paper is to draw conclusions from the application of control and energy management algorithms of DG units in an AC/DC Microgrid which mainly incorporated Photovoltaics Units (PV), mCHPs and Batteries. Especially, the main focus is on the energy control and management of the mCHPs system in order to meet the consumers’ electrical and thermal needs and to minimize the power flow from the main power grid. The simulation scenario aims to highlight the characteristics and particularities of the AC/DC MG in different power generation conditions from PV systems and mCHPs, electrical and thermal consumptions as well as the power supplied by the external power grid. The AC/DC MG responds to the needs of its users for electricity and heat and also operates according to the needs of the market. Finally, the results show significant reduction of power flow from the electricity distribution network. All simulations have been implemented with the Matlab program.
In this research, we propose an energy-efficient predictive control system with outside-air-introduced-type air conditioner in large-scale data center. The system consists of two parts;a predictive part and a control ...
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ISBN:
(纸本)9781538670804;9788993215168
In this research, we propose an energy-efficient predictive control system with outside-air-introduced-type air conditioner in large-scale data center. The system consists of two parts;a predictive part and a control part. We propose to use a dynamic model construction technique called just-in-time (JIT) modeling in the predictive part. It can estimate the air temperature and humidity in the DC room and temperature at the inlet of servers at a high accuracy while the update of data center model is constructed naturally. We also propose to use a control algorithm that utilizes air enthalpy at outside and DC room in addition to the air temperature and humidity in the control part. Owing to the enthalpy, we achieve an effective energy-saving with both wet and dry air. We introduced this predictive control system to a large-scale data center and had verified the improvement in the energy-saving performance for few month. The air temperature and humidity after one hour could be successfully estimated with an accuracy of correlation coefficient of 0.97 or more using the proposed JIT modeling. Furthermore, we demonstrated that the power consumption of the DC room was significantly reduced by 28.9% using the proposed control algorithm compared to that of the conventional control algorithm.
Heat and mass transfer in porous media is a complex mathematical problem involving multiple partial differential equations. The current paper brings into picture the solution strategy to be applied using finite elemen...
Heat and mass transfer in porous media is a complex mathematical problem involving multiple partial differential equations. The current paper brings into picture the solution strategy to be applied using finite element method to solve the heat and mass transfer along with viscous dissipation in Cartesian coordinates. The applied methodology is successful in predicting the heat and mass transfer.
Agriculture is the primary concern in India and it requires more technological developments to be incorporated when compared to other industrial developments. Information and Communication Technologies (ICT) provides ...
Agriculture is the primary concern in India and it requires more technological developments to be incorporated when compared to other industrial developments. Information and Communication Technologies (ICT) provides a simple and cost effective technique to the farmers for enabling the precision agriculture. An information sharing system is developed through this study to support the small scale farmers. The technological developments in smart phone application and web application are used as a path to reach the small scale farmers. The application developed through this study shares an information about sugar cane crop like fertilizer requirement, pesticide requirement etc. This system will provide important and timely information to the small scale farmers like a handy agriculture guide.
Photoresist removal method using hydrogen radicals produced by decomposing hydrogen on a hot-wire catalyst is one of an environmentally friendly methods. We examined the relationship between photoresist removal rate a...
Photoresist removal method using hydrogen radicals produced by decomposing hydrogen on a hot-wire catalyst is one of an environmentally friendly methods. We examined the relationship between photoresist removal rate and its surface temperature and the surface element analysis for a tantalum catalyst. In this study, we considered an adaptability of the catalyst to the removal.
The faithful distribution of entanglement in continuous-variable systems is essential to many quantum information protocols. As such, entanglement distillation and enhancement schemes are a cornerstone of many applica...
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The faithful distribution of entanglement in continuous-variable systems is essential to many quantum information protocols. As such, entanglement distillation and enhancement schemes are a cornerstone of many applications. The photon subtraction scheme offers enhancement with a relatively simple setup and has been studied in various scenarios. Motivated by recent advances in integrated optics, particularly the ability to build stable multimode interferometers with squeezed input states, a multimodal extension to the enhancement via photon subtraction protocol is studied. States generated with multiple squeezed input states, rather than a single input source, are shown to be more sensitive to the enhancement protocol, leading to increased entanglement at the output. Numerical results show the gain in entanglement is not monotonic with the number of modes or the degree of squeezing in the additional modes. Consequently, the advantage due to having multiple squeezed input states can be maximized when the number of modes is still relatively small (e.g., four). The requirement for additional squeezing is within the current realm of implementation, making this scheme achievable with present technologies.
In this paper, a subdomain Galerkin method is set up to find solutions of singularly perturbed boundary value problems which are used widely in many areas such as chemical reactor theory, aerodynamics, quantum mechani...
In this paper, a subdomain Galerkin method is set up to find solutions of singularly perturbed boundary value problems which are used widely in many areas such as chemical reactor theory, aerodynamics, quantum mechanics, reaction-diffusion process, optimal control, etc. A combination of the cubic B-spline base functions as an approximation function is used to build up the presented method over the geometrically graded mesh. Thus finer mesh can be established through the end parts of the problem domain where steep solutions exist.
The thermo-mechanical reliability is a critical issue in a radiative fin. The radiative dissipation pertaining to enhance heat rejection from the fin surfaces. Due to the temperature gradient, the non-uniform thermal ...
The thermo-mechanical reliability is a critical issue in a radiative fin. The radiative dissipation pertaining to enhance heat rejection from the fin surfaces. Due to the temperature gradient, the non-uniform thermal deformation occurs in the fin material. Thermal deformation may cause various defects such as crack propagation, creep, delamination, fatigue failure, erosion and warping. In this study, an analytical model for thermal stresses in an annular radiative fin is presented. The non-linear heat transfer equation with variable thermal parameters has been solved using the homotopy perturbation method (HPM). The comprehensive closed form solution for thermal stresses are obtained from the HPM based temperature field coupled with the classical theory of elasticity. The effects of radiation on the temperature field and thermal stress field are investigated. In addition to forward solution, an inverse analysis has been carried out for estimating the thermal parameters for a reference stress field.
This article discusses the solution strategy to be adopted to solve the heat transfer in porous media having viscous dissipation effect. The solution strategy is based on finite element methodology being adopted to so...
This article discusses the solution strategy to be adopted to solve the heat transfer in porous media having viscous dissipation effect. The solution strategy is based on finite element methodology being adopted to solve the equations. An iteratively procedure is used in order to predict the heat transfer behavior of porous medium confined in a square domain with heating and cooling of vertical walls.
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