There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

The use of microbial fuel cells to generate electrical current is increasingly being seen as a viable source of renewable energy production In this Progress article, Bruce Logan highlights recent advances in our understanding of the mechanisms used by exoelectrogenic bacteria to generate electrical current and the important factors to consider in microbial fuel cell design There has been an increase in recent years in the number of reports of microorganisms that can generate electrical current in microbial fuel cells Although many new strains have been identified, few strains individually produce power densities as high as strains from mixed communities Enriched anodic biofilms have generated power densities as high as 69 W per m2 (projected anode area), and therefore are approaching theoretical limits To understand bacterial versatility in mechanisms used for current generation, this Progress article explores the underlying reasons for exocellular electron transfer, including cellular respiration and possible cell–cell communication

Exoelectrogenic bacteria that power microbial fuel cells

Solar Engineering Of Thermal Processes

A transformer‐less high‐boosting common‐grounded multi‐phase DC–DC converter with continuous input‐current favourable for low‐power applications

In this article a new distinct winding scheme is articulated to utilize three phase induction machines for multifunctional operation. Because of their rugged construction and reduced maintenance induction machines are very popular and well-accepted for agricultural as well as industrial purposes. The proposed winding scheme is used in a three phase induction machine to utilize the machine for multifunctional operation. It can be used as a three-phase induction motor, welding transformer and phase converter. The proposed machine design also works as a single phase induction motor at the same time it works as a three-phase to single phase converter. This new design does not need any kind of special arrangement and can be constructed with small modifications to any standard three-phase induction motor. This modified induction machine is thoroughly tested to determine its efficiency and other parameters and also hardware implementation results are provided in the article, which validate the design and construction.

/pdf/hardware-implementation-and-a-new-adaptation-in-the-winding-2hj481l9gg.pdf

Hardware Implementation and a New Adaptation in the Winding Scheme of Standard Three Phase Induction Machine to Utilize for Multifunctional Operation: A New Multifunctional Induction Machine

Deregulated Electricity Structures and Smart Grids

Rapid technological development in grid integration of renewable energy (RE) plants has increased the RE penetration level in power utility network. This dramatic change in power scenario challenges the protection and stability of grid. Therefore, this work proposed a protection scheme algorithm (PSA) for the RE integrated hybrid power system. This PSA is implemented in the following steps: (1) calculate Wigner distribution function powered fault index (WFI), (2) calculate Stockwell transform powered combined FI (SCFI), (3) calculate hybrid FI (HFI) using WFI and SCFI, (4) classify the faults using number of faulty phases and fault ground index. Proposed hybrid fault index is used for the identification of faults. It also considers the change in magnitude and waveform distortions of current signals. The proposed PSA effectively identifies and classifies the faulty events such as single phase to ground, two phase, two phase to ground and all phases to ground. PSA is successfully tested for the recognition of faults under various operating scenarios like noisy scenario, different magnitudes of fault impedance, fault location node and fault incidence angle, lines comprising of overhead section and underground cable with availability of transformer. This PSA is effective to discriminate the operational switching events compared to faulty events. It is concluded that performance of the introduced PSA is better and fault detection time is less compared to wavelet energy spectrum entropy based PSA, discrete wavelet transform (DWT) based PSA and Stockwell transform supported PSA. 

Hybrid protection algorithm for power system with renewable energy generation using Stockwell transform and Wigner distribution function

Inverting Modified CUK Converter with Switched Inductor $(\mathrm{MCC}_{\mathrm{SI}})$ configurations are articulated in the paper for high-voltage and low-current renewable energy applications. Based on the Switched Inductor (SI) position in MCC converter, four new modified CUK converter configurations are proposed as $\mathrm{MCC}_{\mathrm{SI}}-\mathrm{XLL},\mathrm{MCC}_{\mathrm{SI}}-\mathrm{LYL},\mathrm{MCC}_{\mathrm{SI}}-\mathrm{LLZ}$ and $\mathrm{MCC}_{\mathrm{SI}}-\mathrm{XYZ}$ . The mathematical analysis and comparison is shown in terms of the voltage conversion ratio, number of active and reactive components. The mode of operation of $\mathrm{MCC}_{\mathrm{SI}}-\mathrm{XLL}$ configuration is discussed to understand the working concept of $\mathrm{MCC}_{\mathrm{SI}}$ configurations. The striking features of the proposed configurations are discussed in details. Operation of the proposed converter is verified by simulation in MatLab R2016a.

New Inverting Modified CUK Converter Configurations with Switched Inductor $(\mathbf{MCC}_{\mathbf{SI}})$ for High-Voltage/Low-Current Renewable Applications

Sanjeevikumar Padmanaban

Papers

A transformer‐less high‐boosting common‐grounded multi‐phase DC–DC converter with continuous input‐current favourable for low‐power applications

Hardware Implementation and a New Adaptation in the Winding Scheme of Standard Three Phase Induction Machine to Utilize for Multifunctional Operation: A New Multifunctional Induction Machine

Deregulated Electricity Structures and Smart Grids

Hybrid protection algorithm for power system with renewable energy generation using Stockwell transform and Wigner distribution function

New Inverting Modified CUK Converter Configurations with Switched Inductor $(\mathbf{MCC}_{\mathbf{SI}})$ for High-Voltage/Low-Current Renewable Applications