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  1. Article ; Online: Cybersecurity challenges in energy sector (virtual power plants) - can edge computing principles be applied to enhance security?

    Venkatachary, Sampath Kumar / Alagappan, Annamalai / Andrews, Leo John Baptist

    Energy informatics

    2021  Volume 4, Issue 1, Page(s) 5

    Abstract: Distributed generators (D.G.'s) enable us to generate, supply and be self-reliant on power while also allows us to supply power to meet the demand through virtual power plants. The virtual power plants also help us analyse, control, optimise, and help ... ...

    Abstract Distributed generators (D.G.'s) enable us to generate, supply and be self-reliant on power while also allows us to supply power to meet the demand through virtual power plants. The virtual power plants also help us analyse, control, optimise, and help bridge the gap of demand and supply in these vast energy requirements. With this also comes challenges associated with securing physical systems, data protection and information privacy. Recent technological advancements have aided cybercriminals to disrupt operations by carrying out deliberate attacks on the energy sector. Though security researchers have tried to mitigate the risks, vulnerabilities, and it remains a challenge. This paper aims to present a comprehensive Edge-based security architecture to help reduce the risks and help secure the physical systems and ensure privacy and data protection.
    Language English
    Publishing date 2021-03-31
    Publishing country Germany
    Document type Journal Article
    ISSN 2520-8942
    ISSN (online) 2520-8942
    DOI 10.1186/s42162-021-00139-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Fabrication of microporous layer – free hierarchical gas diffusion electrode as a low Pt-loading PEMFC cathode by direct growth of helical carbon nanofibers

    Sandström, Robin / Alagappan Annamalai / Alexey Klechikov / Joakim Ekspong / Thomas Wågberg / Tiva Sharifi

    RSC advances. 2018 Dec. 12, v. 8, no. 72

    2018  

    Abstract: Improving interfacial contact between each component in the proton exchange membrane fuel cell (PEMFC) can lead to a significant increase in power density and Pt utilization. In this work, the junction between the catalyst layer and gas diffusion layer ( ... ...

    Abstract Improving interfacial contact between each component in the proton exchange membrane fuel cell (PEMFC) can lead to a significant increase in power density and Pt utilization. In this work, the junction between the catalyst layer and gas diffusion layer (GDL) is greatly enhanced through direct attachment of helical carbon nanofibers, giving rise to a hierarchical structure within the electrical interconnections. The alternative novel GDL is produced by spraying a thin layer of Pd2C60 precursor on commercial carbon paper, followed by chemical vapor deposition growth resulting in a surface morphology of well-attached nanofibers surrounding the microfibers present in the commercial carbon paper. Subsequent solvothermal deposition of platinum nanoparticles allowed evaluation of its suitability as gas diffusion electrode in cathodic H2/O2 PEMFC environment. A combination of lowered charge transfer resistance and enhanced Pt-utilization is attributed to its unique wire-like appearance and its robust properties. The fabricated microporous layer – free GDL is suitable for relatively aggressive membrane electrode assembly fabrication procedures and is produced by industrially favorable techniques, rendering it capable of efficiently supporting small amounts of precious metal catalyst nanoparticles in various PEM applications.
    Keywords carbon ; carbon nanofibers ; catalysts ; cathodes ; fuel cells ; hydrogen ; nanoparticles ; paper ; platinum ; porous media ; spraying ; vapors
    Language English
    Dates of publication 2018-1212
    Size p. 41566-41574.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c8ra07569g
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Management of bleeding from gastric remnant after Roux-en-Y gastric bypass.

    Puri, Vichin / Alagappan, Annamalai / Rubin, Moshe / Merola, Stephen

    Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery

    2012  Volume 8, Issue 1, Page(s) e3–5

    MeSH term(s) Female ; Gastrectomy/methods ; Gastric Bypass ; Gastric Stump/surgery ; Gastrointestinal Hemorrhage/etiology ; Gastrointestinal Hemorrhage/surgery ; Humans ; Middle Aged ; Obesity, Morbid/surgery ; Postoperative Complications/surgery
    Language English
    Publishing date 2012-01
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 2274243-8
    ISSN 1878-7533 ; 1550-7289
    ISSN (online) 1878-7533
    ISSN 1550-7289
    DOI 10.1016/j.soard.2010.08.015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: Photoelectrochemical, impedance and optical data for self Sn-diffusion doped Fe2O3 photoanodes fabricated at high temperature by one and two-step annealing methods

    Pravin S. Shinde / Alagappan Annamalai / Ju Hun Kim / Sun Hee Choi / Jae Sung Lee / Jum Suk Jang

    Data in Brief, Vol 5, Iss C, Pp 796-

    2015  Volume 804

    Abstract: The optical, morphological and photoelectrochemical (PEC) properties of transition metal oxide semiconductors are important to understand their influence on water oxidation performance. Herein, we provide experimental evidences for a better understanding ...

    Abstract The optical, morphological and photoelectrochemical (PEC) properties of transition metal oxide semiconductors are important to understand their influence on water oxidation performance. Herein, we provide experimental evidences for a better understanding of the factors that dictate the interactions of Sn-diffusion doping on the PEC properties of Fe2O3 photoanodes fabricated at high temperature by one- and two-step annealing methods. The synthesis, characterization methods and other experimental details are provided. Limited previous information on the PEC and electrochemical impedance spectroscopic studies has been published. This data article contains Supplementary data, figures and methods related to the research article by Shinde et al. (2015) [1]. Here, we provide a further set of the obtained experimental data results.
    Keywords Hematite thin films ; PRED ; Sn diffusion doping ; Photoelectrochemical ; Water oxidation ; Computer applications to medicine. Medical informatics ; R858-859.7 ; Science (General) ; Q1-390
    Language English
    Publishing date 2015-12-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  5. Article ; Online: Profile of Inflammation-associated genes during Hepatic Differentiation of Human Pluripotent Stem Cells

    Joseph Ignatius Irudayam / Deisy Contreras / Lindsay Spurka / Songyang Ren / Vidhya Kanagavel / Arunachalam Ramaiah / Alagappan Annamalai / Samuel W. French / Andrew S. Klein / Vincent Funari / Vaithilingaraja Arumugaswami

    Data in Brief, Vol 5, Iss C, Pp 871-

    2015  Volume 878

    Abstract: Expression of genes associated with inflammation was analyzed during differentiation of human pluripotent stem cells (PSCs) to hepatic cells. Messenger RNA transcript profiles of differentiated endoderm (day 5), hepatoblast (day 15) and hepatocyte-like ... ...

    Abstract Expression of genes associated with inflammation was analyzed during differentiation of human pluripotent stem cells (PSCs) to hepatic cells. Messenger RNA transcript profiles of differentiated endoderm (day 5), hepatoblast (day 15) and hepatocyte-like cells (day 21) were obtained by RNA sequencing analysis. When compared to endoderm cells an immature cell type, the hepatic cells (days 15 and 21) had significantly higher expression of acute phase protein genes including complement factors, coagulation factors, serum amyloid A and serpins. Furthermore, hepatic phase of cells expressed proinflammatory cytokines IL18 and IL32 as well as cytokine receptors IL18R1, IL1R1, IL1RAP, IL2RG, IL6R, IL6ST and IL10RB. These cells also produced CCL14, CCL15, and CXCL- 1, 2, 3, 16 and 17 chemokines. Endoderm cells had higher levels of chemokine receptors, CXCR4 and CXCR7, than that of hepatic cells. Sirtuin family of genes involved in aging, inflammation and metabolism were differentially regulated in endoderm and hepatic phase cells. Ligands and receptors of the tumor necrosis factor (TNF) family as well as downstream signaling factors TRAF2, TRAF4, FADD, NFKB1 and NFKBIB were differentially expressed during hepatic differentiation.
    Keywords pluripotent stem cells ; hepatic cells ; endoderm ; hepatoblast ; hepatocytes ; differentiation ; differential gene expression ; inflammation ; cytokines ; sirtuin ; SIRT1 ; Computer applications to medicine. Medical informatics ; R858-859.7 ; Science (General) ; Q1-390
    Language English
    Publishing date 2015-12-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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