scholarly journals A New Approach to the design of DC Powered Induction Cooker

2018 ◽  
Vol 1 (1) ◽  
pp. 35-42
Author(s):  
Bikal Adhikari ◽  
Jagan Nath Shrestha ◽  
Shree Raj Shakya
Keyword(s):  
Low Voltage ◽  
Load Shedding ◽  
Liquefied Petroleum Gas ◽  
Residential Energy ◽  
Total Energy Consumption ◽  
New Approach ◽  
Residential Sector ◽  
Simulation Efficiency ◽  
Electricity Load ◽  
Very High

About 80 % of total energy consumption in Nepal is being consumed in the residential sector and about 60 % of total residential energy application includes cooking application. At present, in urban area, there is heavy dependence on liquefied petroleum gas for cooking purpose whereas in rural area, there is heavy dependence on biomass. Clearly, there is a need to switch towards clean and efficient fuel: electricity. Load shedding problem has been a reason preventing Nepalese people to switch towards electricity based cooking. Even though at present (2017), Nepal Electricity Authority’s has been able to reduce load shedding for residential consumers, there is still a condition of inadequate supply of electricity if all of the consumers will switch towards electricity for cooking purpose. The experimental and simulation efficiency of conventional AC based induction cooker has been found to be 85.56 % and 87 % respectively. DC powered induction cooker has been designed and simulated. The simulation efficiency of which has been measured to be 90.10 %. The hardware realization of the design is malfunctioning in real time testing making a need of power electronic component with the capacity to pass very high current, as high as 80 A at low voltage, as low as 12 V.

Impact of Utilizing PV Surplus Electricity on CO2 Emissions From the Residential Energy Systems

2017 ◽  
Author(s):  
Toshiyuki Nagai ◽  
Akira Yoshida ◽  
Yoshiharu Amano
Keyword(s):  
Co2 Emissions ◽  
Low Voltage ◽  
Energy Systems ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Residential Energy ◽  
Energy Storage Devices ◽  
Water Heater ◽  
Storage Devices ◽  
Residential Sector

In order to reduce CO2 emissions in the residential sector, the installation of photovoltaics (PV) has been increasing extensively. However, such large-scale PV installations cause problems in the low-voltage distribution grid of the residential sector, such as PV related voltage surges. In this study, the utilization of suppressed PV output through energy storage devices was proposed. Using demand side energy storage devices reduces voltage surge, transmission loss, and CO2 emissions from the residential buildings. The objective of this study was to add voltage constraints of the low-voltage distribution grid to an operational planning problem that we developed for the residential energy systems, and to quantitatively evaluate the potential of heat pump water heater (HP) to utilize the PV surplus electricity, while considering the electrical grid constraints based on the minimization of CO2 emissions. We found that when a 4.5 kW HP with 370 L storage, which utilizes PV output, was added to the system, the reduction in CO2 emissions was more than twice compared with that in the case of adding 4 kWh battery (BT) to a PV and gas fired water heater configuration. Further, the effect of utilizing the suppressed PV electricity by HP was almost equivalent to that by the BT. Therefore, the potential of HP in utilizing PV surplus electricity is higher than that of the BT in terms of CO2 emissions reduction in the residential sector.

High resolution at low voltage: A new approach

1989 ◽  
Vol 47 ◽  
pp. 76-77
Author(s):  
Arthur V. Jones
Keyword(s):  
Low Voltage ◽  
Emission Sources ◽  
New Approach ◽  
Design Concepts ◽  
Probe Diameter ◽  
Low Voltage Operation ◽  
Sufficient Intensity ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Immersion Type

With the introduction of field-emission sources and “immersion-type” objective lenses, the resolution obtainable with modern scanning electron microscopes is approaching that obtainable in STEM and TEM-but only with specific types of specimens. Bulk specimens still suffer from the restrictions imposed by internal scattering and the need to be conducting. Advances in coating techniques have largely overcome these problems but for a sizeable body of specimens, the restrictions imposed by coating are unacceptable.For such specimens, low voltage operation, with its low beam penetration and freedom from charging artifacts, is the method of choice.Unfortunately the technical dificulties in producing an electron beam sufficiently small and of sufficient intensity are considerably greater at low beam energies — so much so that a radical reevaluation of convential design concepts is needed.The probe diameter is usually given by

Evaluation of the mechanical properties of Inconel 718 to SCM 440 dissimilar friction welding through real-time monitoring of the acoustic emission system

2021 ◽  
pp. 146442072199383
Author(s):  
Yu Sik Kong ◽  
Muralimohan Cheepu ◽  
Jin-Kyung Lee
Keyword(s):  
Acoustic Emission ◽  
Friction Welding ◽  
Inconel 718 ◽  
Low Voltage ◽  
Dissimilar Materials ◽  
Average Frequency ◽  
Very High Frequency ◽  
Cumulative Count ◽  
Emission System ◽  
Very High

Friction welding was chosen for its versatility in the joining of dissimilar materials with high quality. The aim of this study is to determine the optimal welding conditions for attaining quality joints by using online monitoring of acoustic emission system signals. During friction welding, the formation of cracks, defects, or any abnormalities in the joining process which have a detrimental effect on the joints quality was identified. The most widely used materials in the aerospace industry—Inconel 718 and molybdenum steel—were joined by friction welding. The precision of the joints, internal defects, and quality are major concerns for aerospace parts. The results of the present research determined the optimal welding conditions for high tensile strength by nondestructively inducing acoustic emission signals. During friction time and upset time periods, the typical waveforms and frequency spectrum of the acoustic emission signals were recorded, and their energy level, average frequency, cumulative count, and amplitude were analyzed. Both cumulative count and amplitude were found to be useful parameters for deriving the optimal welding conditions. In the initial stage of friction welding, a very high voltage of continuous form was generated with frequency characteristics of 0.44 MHz and 0.54 MHz. The signals generated during the upset stage had a low voltage, but a very high frequency of 1.56 MHz and 1.74 MHz with a burst-type signal. The amplitude of the signal generated for the optimally welded joints was about 100 dB at the friction time and about 45 dB at the upset time.

Electricity load-shedding in Pakistan: Unintended consequences, opportunities and policy recommendations

Energy Policy ◽  
2019 ◽  
Vol 128 ◽  
pp. 411-417 ◽  
Author(s):  
Hussain Kazmi ◽  
Fahad Mehmood ◽  
Zhenmin Tao ◽  
Zainab Riaz ◽  
Johan Driesen
Keyword(s):  
Unintended Consequences ◽  
Load Shedding ◽  
Policy Recommendations ◽  
Electricity Load

scholarly journals ELS-Net: A New Approach to Forecast Decomposed Intrinsic Mode Functions of Electricity Load

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 198935-198949
Author(s):  
Nadeem Javaid ◽  
Aqdas Naz ◽  
Rabiya Khalid ◽  
Ahmad Almogren ◽  
Muhammad Shafiq ◽  
...  
Keyword(s):  
Intrinsic Mode Functions ◽  
New Approach ◽  
Electricity Load

New approach of adaptive automatic load shedding

2001 ◽  
Vol 11 (5) ◽  
pp. 329-334 ◽  
Author(s):  
V. V. Terzija ◽  
H.-J. Koglin
Keyword(s):  
Load Shedding ◽  
New Approach

scholarly journals A New Approach to Decoupled Non-Resonant Polishing

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 484
Author(s):  
Yucheng Li ◽  
Xiaoqin Zhou ◽  
Guilian Wang ◽  
Peiqun Ma ◽  
Rongqi Wang
Keyword(s):  
Theoretical Model ◽  
Vibration Frequency ◽  
Theoretical Studies ◽  
Workpiece Surface ◽  
New Approach ◽  
Structured Surfaces ◽  
Processing Demands ◽  
The Stability ◽  
Polishing Tool ◽  
Very High

Two-dimensional vibration-assisted polishing (2D-VAP) is a new polishing approach proposed in recent years, which is considered to be very suitable for the polishing of micro-optical parts and micro-structured surfaces. The advantages of the 2D-VAP approach are as follows: A very high relative velocity can be obtained between the workpiece and the polishing tool; the desired motion trajectory can be formed in one polishing cycle. However, there are still some problems to be solved in the 2D-VAP approach, mainly involving: The vibration frequency of the resonant excitation cannot be regulated, which makes it difficult to adapt to the processing demands of different materials; the theoretical model of removal function has been studied in few papers; and motion coupling occurs easily between the horizontal and vertical directions, which affects the trajectory synthesized at the polishing tool. In order to solve these problems, a new approach to decoupled non-resonant polishing is developed in this paper, and its effectiveness is investigated by the theoretical analysis and polishing experiments. Theoretical studies of removal function show that the vibration frequency, vibration amplitude and loading force are proportional to the removal depth. The comparison of experimental and modeling results of removal function show that they have good coherence, and the correctness of the theoretical model of removal function is verified. In addition, the stability experiments of removal function prove that the polishing approach has better stability and is beneficial to the convergence of workpiece surface.

scholarly journals Early Window Tailoring: A New Approach to Increase the Number of TCP Connections Served

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Marcos Talau ◽  
Mauro Fonseca ◽  
Emilio C. G. Wille
Keyword(s):  
Congestion Control ◽  
Loss Rate ◽  
New Approach ◽  
Window Management ◽  
Multiple Devices ◽  
Congestion Control Mechanism ◽  
Tcp Connections ◽  
Multiple Scenarios ◽  
Very High ◽  
Better Than

In the absence of losses, TCP constantly increases the amount of data sent per instant of time. This behavior leads to problems that affect its performance, especially when multiple devices share the same gateway. Several studies have been done to mitigate such problems, but many of them require TCP side changes or a meticulous configuration. Some studies have shown promise, such as the use of gateway techniques to change the receiver’s advertised window of ACK segments based on the amount of memory in the gateway; in this work, we use the term “network-return” to refer to these techniques. In this paper, we present a new network-return technique called early window tailoring (EWT). For its use, it does not require any modification in the TCP implementations at the sides and does not require that all routers in the path use the same congestion control mechanism, and the use in the gateway is sufficient. With the use of the simulator ns-3 and following the recommendations of RFC 7928, the new approach was tested in multiple scenarios. The EWT was compared to drop-tail, RED, ARED, and the two network-return techniques—explicit window adaptation (EWA) and active window management (AWM). In the results, it was observed that EWT was shown to be efficient in congestion control. Its use avoided losses of segments, bringing expressive gains in the transfer latency and goodput and maintaining fairness between the flows. However, unlike other approaches, the most prominent feature of EWT is its ability to maintain a very high number of active flows at a given level of segment loss rate. The EWT allowed the existence of a number of flows, which is on average 49.3% better than its best competitor and 75.8% better when no AQM scheme was used.

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