Halobacterium salinarum Strain MMD047 -A Low-salt Adapted Member of the Halobacteriaceae?

Aharon Oren,Antonio Ventosa 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6

In a paper recently in Biotechnology and Bioprocess Engineering (vol. 14, pp. 67-75), Shanmughapriya and coworkers described a prokaryote (strain MMD047) isolated from a marine sponge, which they classified as a strain of Halo-bacterium salinarum. As the strain grows at low salinity only, its behavior is greatly different from that of other Halo-bacterium isolates . In spite of multiple requests, the strain has not been made available for further studies and we therefore call upon the authors of the paper to release their interesting isolate for an in-depth taxonomic characterization In a paper recently in Biotechnology and Bioprocess Engineering (vol. 14, pp. 67-75), Shanmughapriya and coworkers described a prokaryote (strain MMD047) isolated from a marine sponge, which they classified as a strain of Halo-bacterium salinarum. As the strain grows at low salinity only, its behavior is greatly different from that of other Halo-bacterium isolates . In spite of multiple requests, the strain has not been made available for further studies and we therefore call upon the authors of the paper to release their interesting isolate for an in-depth taxonomic characterization

QoS-Oriented Solutions for Satellite Broadcasting Systems

Aharon Vargas,Wolfgang H. Gerstacker,Marco Breiling 한국통신학회 2010 Journal of communications and networks Vol.12 No.6

In this paper, we analyze the capability of satellite broadcasting systems to offer different levels of quality of service (QoS). We focus on the European telecommunications standards institute satellite digital radio and digital video broadcasting satellite handheld (DVB–SH) standards, which have recently been proposed for satellite broadcasting communications. We propose a strategy to provide different levels of QoS for the DVB–SH standard on the basis of an extension of the interleaving scheme, referred to as molded interleaver, which supports low latency service requirements for interactive services. An extensive analysis based on laboratory measurements shows the benefits of this solution. We also present a multilevel coding (MLC) scheme with multistage decoding designed for broadcasting communications as an alternative to the existing standards, where services with different levels of QoS are provided. We present a graphical method based on mutual information for the design and evaluation of MLC systems used for broadcasting communications. Extensive simulations for a typical satellite channel show the viability of the proposed MLC scheme. Finally, we introduce multidimensional constellations in the proposed MLC scheme in order to increase the number of different protection levels.

Cooling of High-Temperature Cylindrical Surface Using an Array of Water Impingement Jets

Joseph Aharon,Ronen Harari,Yeshayahu Weiss,Mordechai Haim,Michal Katz 대한기계학회 1998 Heat transter conference Vol.5 No.1

QoS-Oriented Solutions for Satellite Broadcasting Systems

Vargas, Aharon,Gerstacker, Wolfgang H.,Breiling, Marco The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.6

In this paper, we analyze the capability of satellite broadcasting systems to offer different levels of quality of service (QoS). We focus on the European telecommunications standards institute satellite digital radio and digital video broadcasting satellite handheld (DVB-SH) standards, which have recently been proposed for satellite broadcasting communications. We propose a strategy to provide different levels of QoS for the DVB-SH standard on the basis of an extension of the interleaving scheme, referred to as molded interleaver, which supports low latency service requirements for interactive services. An extensive analysis based on laboratory measurements shows the benefits of this solution. We also present a multilevel coding (MLC) scheme with multistage decoding designed for broadcasting communications as an alternative to the existing standards, where services with different levels of QoS are provided. We present a graphical method based on mutual information for the design and evaluation of MLC systems used for broadcasting communications. Extensive simulations for a typical satellite channel show the viability of the proposed MLC scheme. Finally, we introduce multidimensional constellations in the proposed MLC scheme in order to increase the number of different protection levels.

Proposed minimal standards for the use of genome data for the taxonomy of prokaryotes

Chun, Jongsik,Oren, Aharon,Ventosa, Antonio,Christensen, Henrik,Arahal, David Ruiz,da Costa, Milton S.,Rooney, Alejandro P.,Yi, Hana,Xu, Xue-Wei,De Meyer, Sofie,Trujillo, Martha E. Microbiology Society 2018 International journal of systematic and evolutiona Vol.68 No.1

Controllable synthesis of nanohorn-like architectured cobalt oxide for hybrid supercapacitor application

Sivakumar, Periyasamy,Jana, Milan,Kota, Manikantan,Jung, Min Gyu,Gedanken, Aharon,Park, Ho Seok Elsevier 2018 Journal of Power Sources Vol.402 No.-

<P><B>Abstract</B></P> <P>We demonstrate a facile and controllable synthesis of horn-like Co<SUB>3</SUB>O<SUB>4</SUB> nanostructures through a solvothermal process followed by calcination at different temperatures. The particle sizes and defects of the as-obtained Co<SUB>3</SUB>O<SUB>4</SUB> nanohorns are controlled with respect to calcining temperatures, while preserving the horn-like morphology. In particular, the Co<SUB>3</SUB>O<SUB>4</SUB> nanohorn electrodes prepared at 300 °C reveal the specific capacitance of ∼2751 F g<SUP>−1</SUP> and the rate capability of 46.8%, which is greater than those of materials obtained at 350, 400, and 450 °C. In order to enlarge the potential window, a hybrid supercapacitor is configured with the Co<SUB>3</SUB>O<SUB>4</SUB> nanohorn and activated carbon used as positive and negative electrodes, respectively. The as-fabricated hybrid supercapacitor shows high specific capacitance of ∼101 F g<SUP>−1</SUP> and the rate capability of 80.5%. The energy and power densities of hybrid supercapacitor are ∼31.70 W h kg<SUP>−1</SUP> and 16.71 kW kg<SUP>−1</SUP>, respectively, along with 91.37% of capacitance retention over 350,000 cycles. These energy and power densities of the hybrid supercapacitors are approximately 8.5 and 3.5 times greater than values of Co<SUB>3</SUB>O<SUB>4</SUB> symmetric supercapacitor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanohorn-like Co<SUB>3</SUB>O<SUB>4</SUB> architectures are synthesized. </LI> <LI> The high specific capacitance of 2751 F g<SUP>−1</SUP> is obtained at the optimized temperature. </LI> <LI> Energy density of hybrid supercapacitor is ∼31.70 W h kg<SUP>−1</SUP>. </LI> <LI> Capacitance retention is 91.37% over 350,000 charge-discharge cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Hexagonal plate-like Ni-Co-Mn hydroxide nanostructures to achieve high energy density of hybrid supercapacitors

Sivakumar, Periyasamy,Jana, Milan,Jung, Min Gyu,Gedanken, Aharon,Park, Ho Seok The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.18

<P>Nanostructured mixed multi-metal compounds (NCM) based on nickel (Ni), cobalt (Co), and manganese (Mn) are considered as promising electrode materials owing to their multiple valence states, facile accessibility to active sites, and low activation energy for electron transfer. Herein, we demonstrated the fabrication of a hexagonal nanoplate-like architecture of ternary NCM hydroxide with controlled size and composition by a facile one-pot hydrothermal process. The size and composition of the hexagonal NCM nanoplates were controlled by varying the ratio of Ni to (Co + Mn) sources. Accordingly, the maximum capacitance of the optimum NCM is 1188 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP> with high rate capacitance due to abundant active sites of the Ni-rich phase and rapid charge transfer kinetics of the nanoplate architecture. By integrating high-capacity Ni-rich NCM hydroxide as a positive electrode with activated carbon as a negative electrode, a full cell of a hybrid supercapacitor (HSC) was configured in the enlarged voltage window of 0-1.5 V. Therefore, the HSC cells deliver the maximum energy and power densities of 42.56 W h kg<SUP>−1</SUP> and 17 791.56 W kg<SUP>−1</SUP>, respectively, showing good cycling stability with 78.8% capacity retention over 50 000 cycles and the coulombic efficiency of 100%.</P>