Integrated control scheme for dynamic power management with improved voltage regulation in DC microgrid

Deshmukh, Rohit R.,Ballal, Makarand S. The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6

This article presents an integrated control scheme to improve power sharing for power management and voltage regulation in DC microgrids. The proposed scheme considers the available power and the stochastic nature of sources to achieve adequate power sharing among them. Therefore, it achieves effective utilization of each source. In addition, the effective use of energy storage systems (ESSs) is also achieved by reducing their charging/discharging cycles. The proposed control scheme improves voltage regulation under various operating conditions. It enhances the stability of microgrids and improves their dynamic response. The proposed control scheme is adaptive to changes in the source or load. It operates without historical/previous data, which reduces the computational burden. The proposed control scheme is experimentally validated under diverse operating conditions.

Chitosan-Vitamin C Nanoparticles

DESHMUKH AARTI RAJENDRA,김범수 한국생물공학회 2019 KSBB Journal Vol.34 No.4

Vitamin C is a very important module related to many biochemical functions of human body. Vitamin C is highly sensitive and can be lost if exposed to high temperature, humid air, light, and alkaline pH. In recent decades, use of chitosan nanoparticles as nanocarriers has received much attention due to their biocompatibility, biodegradability, and non-toxicity. Chitosan nanoparticles containing vitamins, flavors, enzymes, and antimicrobial agents can maintain their activity. Chitosan nanoparticles can stimulate the stabilization of vitamin C and improve controlled release. This review provides a summary of the preparation and characterization of chitosan nanoparticles and potential benefits of vitamin C-containing chitosan nanoparticles. In addition, biological functions, dietary restrictions, and mechanisms of vitamin C are reviewed. Various challenges and future scope for improving the properties of vitamin C using chitosan nanoparticles are also discussed.

ACCB- Adaptive Congestion Control with backoff Algorithm for CoAP

Deshmukh, Sneha,Raisinghani, Vijay T. International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.10

Constrained Application Protocol (CoAP) is a standardized protocol by the Internet Engineering Task Force (IETF) for the Internet of things (IoT). IoT devices have limited computation power, memory, and connectivity capabilities. One of the significant problems in IoT networks is congestion control. The CoAP standard has an exponential backoff congestion control mechanism, which may not be adequate for all IoT applications. Each IoT application would have different characteristics, requiring a novel algorithm to handle congestion in the IoT network. Unnecessary retransmissions, and packet collisions, caused due to lossy links and higher packet error rates, lead to congestion in the IoT network. This paper presents an adaptive congestion control protocol for CoAP, Adaptive Congestion Control with a Backoff algorithm (ACCB). AACB is an extension to our earlier protocol AdCoCoA. The proposed algorithm estimates RTT, RTTVAR, and RTO using dynamic factors instead of fixed values. Also, the backoff mechanism has dynamic factors to estimate the RTO value on retransmissions. This dynamic adaptation helps to improve CoAP performance and reduce retransmissions. The results show ACCB has significantly higher goodput (49.5%, 436.5%, 312.7%), packet delivery ratio (10.1%, 56%, 23.3%), and transmission rate (37.7%, 265%, 175.3%); compare to CoAP, CoCoA+ and AdCoCoA respectively in linear scenario. The results show ACCB has significantly higher goodput (60.5%, 482%,202.1%), packet delivery ratio (7.6%, 60.6%, 26%), and transmission rate (40.9%, 284%, 146.45%); compare to CoAP, CoCoA+ and AdCoCoA respectively in random walk scenario. ACCB has similar retransmission index compare to CoAp, CoCoA+ and AdCoCoA respectively in both the scenarios.

(φ, ξ, η)-CONNECTIONS IN ALMOST PARACONTACT MANIFOLD

Deshmukh, Sharief,Farzadi, Ghaffar Department of Mathematics 1980 Kyungpook mathematical journal Vol.20 No.1

THERMAL STRESSES IN A SEMI-INFINITE SOLID CYLINDER SUBJECTED TO INTERNAL HEAT GENERATION

DESHMUKH, KISHOR CHINTANAMRAO,QUAZI, YUSUF IQBAL Korean Mathematical Society 2015 대한수학회논문집 Vol.30 No.4

The present paper deals with the determination of displacement and thermal stresses in a semi-infinite circular cylinder defined as $0{\leq}r{\leq}b$, $0{\leq}z<{\infty}$, due to internal heat generation within it. A circular cylinder is considered having arbitrary initial temperature and subjected to time dependent heat flux at the fixed circular boundary (r = b) whereas the zero temperature at the lower surface (z = 0) of the semi-infinite circular cylinder. The governing heat conduction equation has been solved by using integral transform method. The results are obtained in series form in terms of Bessel functions. The results for displacement and stresses have been computed numerically and illustrated graphically.

Chemical synthesis of ZnO nanorods: Investigations of electrochemical performance and photo-electrochemical water splitting applications

Deshmukh, P.R.,Sohn, Youngku,Shin, Weon Gyu Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.711 No.-

<P><B>Abstract</B></P> <P>Zinc Oxide (ZnO) nanorods were prepared by facile and inexpensive chemical route at low temperature. X-ray diffraction study confirms the formation of hexagonal wurtzite crystal structure with high orientation along the c-axis. FE-SEM images show a vertical alignment of ZnO nanorods to the substrate surface, whose average diameter and length is 1.33 and 15 μm, respectively. Electrochemical performance and photo-electrochemical water splitting of ZnO nanorods are investigated in 1 M Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte using the different electrochemical techniques. Electrochemical study of ZnO nanorods exhibits the maximum areal capacitance of 29.36 mFcm<SUP>−2</SUP> in the negative potential window, which is higher than the areal capacitance of 10.84 mFcm<SUP>−2</SUP> in the positive potential window at the scan rate of 5 mVs<SUP>−1</SUP>. ZnO nanorods show the excellent stability of 97% over the 3000 cycles in both potential windows. Photo-electrochemical water splitting demonstrates the fast photo-response with 0.098% photo-conversion efficiency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low temperature chemical synthesis of ZnO nanorods. </LI> <LI> Study of ZnO nanorods in electrochemical and PEC water splitting applications. </LI> <LI> ZnO nanorods exhibits the maximum areal capacitance of 29.36 mFcm<SUP>−2</SUP>. </LI> <LI> ZnO nanorods demonstrated the superb 97% stability over 3000 cycles. </LI> <LI> PEC water splitting showed the fast photoresponse and photo conversion efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Experimental and numerical analysis on temporal dynamics of polarization switching in an injection-locked 155-μm wavelength VCSEL: errata

Deshmukh, Vijay Manohar,Lee, Seoung Hun,Kim, Dong Wook,Kim, Kyong Hon,Lee, Min Hee The Optical Society 2012 Optics express Vol.20 No.10

Electrochemical performance of facile developed aqueous asymmetric (Fe,Cr)₂O₃//MnO₂ supercapacitor

Deshmukh, P.R.,Sohn, Youngku,Shin, Weon Gyu Elsevier 2018 ELECTROCHIMICA ACTA Vol.285 No.-

<P><B>Abstract</B></P> <P>The present study demonstrate the development of novel aqueous asymmetric supercapacitor based on polygonal integrated oxide layer ((Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB>) as the anode and spherical MnO<SUB>2</SUB> nanoparticles as the cathode. The polygonal (Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB> integrated oxide layer was obtained by the simple thermal oxidation method and low-cost, scalable chemical route was employed for the synthesis of spherical MnO<SUB>2</SUB> nanoparticles. Furthermore, electrochemical investigations of asymmetric supercapacitor (ASC) studied in aqueous electrolytes show an extended operating voltage of 1.6 and 2.0 V with the maximum specific capacitance of 34 and 37 Fg<SUP>-1</SUP> in KOH and Na<SUB>2</SUB>SO<SUB>4</SUB>, respectively. The observed energy density and power density of ASC in Na<SUB>2</SUB>SO<SUB>4</SUB> (or KOH) electrolyte is 20.89 (or 12.36) Whkg<SUP>−1</SUP> and 2173.913 (or 1739) Wkg<SUP>−1</SUP>, respectively. ASC shows the better capacitance retention over the 5000 cycles in both the electrolytes. Therefore, present study open-up new construction of inexpensive petty (Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB> anode material for the development of high energy density ASCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Preparation of (Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB> oxide layer and MnO<SUB>2</SUB> nanoparticles as a binder free electrode materials. </LI> <LI> (Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB> and MnO<SUB>2</SUB> shows the specific capacitance of 372 and 174 Fg<SUP>-1</SUP> in Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. </LI> <LI> Development of aqueous asymmetric supercapacitor made from (Fe,Cr)<SUB>2</SUB>O<SUB>3</SUB> and MnO<SUB>2</SUB>. </LI> <LI> Asymmetric supercapacitor shows the high specific capacitance of 37 Fg<SUP>-1</SUP> in Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. </LI> <LI> Asymmetric supercapacitor shows the high-energy density of 20.89 Whkg<SUP>−1</SUP> in Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Placing the Household in Perspective : A Framework for Research and Policy

DESHMUKH-RANADIVE, Joy Asian Center Women's Studies Korean Women's Instit 2001 Asian Journal of Women's Studies(AJWS) Vol.7 No.1

This paper attempts to create a gender related conceptual framework around the household, which can be put to use in research and policy. Policy makers' understanding about the household is drawn from economics and it is both limited and unrealistic. Therefore, this study opens the concept of the household for analysis, showing how it is imperative to consider familial dynamics for arriving at a clearer perception of intra-domestic functioning. Analytically, the household and the family are reconciled into the concept of the domestic unit, using a :multidisciplinary approach. The close connection of women's lives to the domestic unit they live in, makes it necessary to focus upon power disparities within it. The concept of the domestic unit opens doors to multidisciplinary explanatory variables, which can make sense of seeming irrationalities that constitute intra-domestic functioning. This paper also develops the concept of space to arrive at a measure of power and empowerment. A parallel concept of environment (domestic and macro) is used to establish the nexus between micro and macro phenomena. Against the Indian backdrop, it also traces conceptual routes to suggest how effects of macro changes, like economic restructuring, on women can be ascertained within domestic units. The purpose of the entire exercise is to assist in the quest of social scientists to arrive at usable constructs that bring hypotheses closer to reality. The philosophy underlying development efforts is questioned in the process. The issue of whether the human being is an active subject, rather than a passive object, is seen separately from the problem of heralding her/him for intrinsic or instrumental value. While both values arc recognized as important, this paper stresses the need to see people as active subjects with a will to develop.

Antenna sensor skin for fatigue crack detection and monitoring

Deshmukh, Srikar,Xu, Xiang,Mohammad, Irshad,Huang, Haiying Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.8 No.1

This paper presents a flexible low-profile antenna sensor for fatigue crack detection and monitoring. The sensor was inspired by the sense of pain in bio-systems as a protection mechanism. Because the antenna sensor does not need wiring for power supply or data transmission, it is an ideal candidate as sensing elements for the implementation of engineering sensor skins with a dense sensor distribution. Based on the principle of microstrip patch antenna, the antenna sensor is essentially an electromagnetic cavity that radiates at certain resonant frequencies. By implementing a metallic structure as the ground plane of the antenna sensor, crack development in the metallic structure due to fatigue loading can be detected from the resonant frequency shift of the antenna sensor. A monostatic microwave radar system was developed to interrogate the antenna sensor remotely. Fabrication and characterization of the antenna sensor for crack monitoring as well as the implementation of the remote interrogation system are presented.