278 research outputs found
Impacts of Ta Buffer Layer and Cu-Ge-Te Composition on the Reliability of GeSe-Based CBRAM
No full textsponsorship: This work was supported by imec's Core Partner Industrial Affiliation Program on Emerging Memories. The review of this article was arranged by Editor P. Du. (Corresponding author: Janaki Radhakrishnan.) (imec's Core Partner Industrial Affiliation Program on Emerging Memories)status: Publishe
Efficacy of sugarcane bagasse to produce bacterial biofilm in water for fish culture
No full textThe present study has been conducted to understand the efficacy of sugarcane bagasse to produce bacterial biofilm in water. The study period was 90 days. Total Plate count (TPC) in water and substrate was estimated on nutrient agar at room temperature by spread plate method. The TPC in water was the highest (2.10 x 104 ml–1) after 45 days. The average TPC of bacteria on bagasse varied from 140.0 (15d) to 30.25 (90d) x104·g–1. The present study demonstrates that the sugarcane bagasse can produce more bacteria in water thereby the fish can effectively utilize biofilm grown on sugarcane bagasse and provision of a substrate reduces the need for artificial feed.---------------------------------------------------------------------------------------------------------Efficacy of sugarcane bagasse to produce bacterial biofilm in water for fish culture M.V. Radhakrishnan and E.SugumaranDepartment of Zoology, Annamalai University, Annamalainagar – 608 002, Tamilnadu, India *Corresponding Author, Email: [email protected] Cite This Article As: M.V. Radhakrishnan, E. Sugumaran. 2010. Efficacy of sugarcane bagasse to produce bacterial biofilm in water for fish culture. J. Ecobiotechnol. 2(2):41-44
Baclofen-induced neurotoxicity in a patient with end-stage renal disease
No full textBaclofen, predominantly excreted by the kidneys is accumulated in patients with renal insufficiency leading to the central nervous system toxicity. Here the author reports a patient with end-stage renal disease on maintenance hemodialysis (HD) who developed drowsiness and became unresponsive within a day after taking single 10 mg dose of baclofen. Patient improved completely after two sessions of HD
A Dynamic Structural Model of Contraceptive Use and Employment Sector Choice for Women in Indonesia
No full textThis research investigates the impact of the Indonesian family planning program on the labor force participation decisions and contraceptive choices of women. I develop a discrete choice dynamic structural model, where each married woman in every period makes joint choices regarding the method of contraceptive used and the sector of employment in which to work in order to maximize her expected discounted lifetime utility function. Each woman obtains utility from pecuniary sources, nonpecuniary sources, and choice-specific time shocks. In addition to the random shocks, there is uncertainty in the model as a woman can only imperfectly control her fertility. Dynamics in the model are captured by several forms of state and duration dependence. Women in this model make different choices due to different preferences, differences in observable characteristics, and realization of uncertainty. The choices made by a woman depend on the compatibility between raising children and the sector of employment (including wages). While making decisions regarding contraceptive use, a woman considers the trade-off between costs (monetary and nonmonetary) of having a child and the benefits from having one. The primary source of data for this study is the first wave of the Indonesia Family Life Survey (IFLS 1), a retrospective panel. In my research, I use the geographic expansion and the changing nature of the Indonesian family planning program as sources of exogenous variation to identify the parameters of the structural model. I estimate the model using maximum likelihood techniques with data from IFLS 1 for the periods 1979-1993. Structural model estimates indicate that informal sector jobs offer greater compatibility between work and childcare. Parameter estimates indicate that choices of contraception method and employment sector vary by exogenous characteristics.Family planning, female labor force participation, contraception, formal sector, Indonesia
A monolithically integrated power JFET and Junction Barrier Schottky diode in 4H silicon carbide
No full textEfficiency of power management circuits depends significantly on their constituent switches and rectifiers. The demands of technology are increasingly running up against the intrinsic properties of Si based power devices. 4H-Silicon Carbide (SiC) has superior properties that make it attractive for high power applications. SiC rectifiers are already a competitive choice and SiC switches have also been commercialized recently. Junction Barrier Schottky (JBS) diodes, which combine the advantages of PN and Schottky, have higher Figure of Merit (FOM) as rectifiers. Among switches, a robust and mature process has been developed for Silicon Carbide Vertical Junction Field Effect Transistors (VJFETs), which currently gives it the highest unipolar FOM. Switches are frequently combined with anti-parallel diodes in power circuits. This thesis describes the development of a SiC-based monolithically integrated power switch and diode. Monolithic integration increases reliability and efficiency, and reduces cost. Because of their superior properties and similarities in fabrication, we chose the SiC VJFET and JBS diode as the switch and rectifier. Detailed design, fabrication and characterization of the integrated switch to block above 800 V and conduct current beyond 100 A/cm2 is explained. In this process, the first physics-based 2-D compact model is developed for reverse leakage in a JBS diode as a function of design parameters. Since the gate-channel junctions of SiC VJFETs cannot be assumed to be abrupt, an existing analytical model for Si VJFETs is extended to account for graded gate-channel junctions. Using these analytical models, design rules are developed for the VJFET and JBS diode. Finite element simulations are used to find the best anode layout of the JBS diode and optimize electric field termination in the integrated device to ensure their capability to operate at high voltage. Finally, a spin-on glass based process is developed for filling the gate trenches of the VJFET to improve long-term robustness in extreme environments. The integrated power switch developed in this thesis points to the attractions of monolithic integration in SiC power circuits. Analytical compact design equations derived here will facilitate faster and easier design of switches and rectifiers for desired circuit operation.Ph. D.Includes bibliographical referencesIncludes vitaby Rahul Radhakrishna
The JRP statistical programs for high speed IBM digital computers [by] B. K. Radhakrishnan and Nils B. Mattsson, with the assistance of Norman A. Starr.
No full texthttp://deepblue.lib.umich.edu/bitstream/2027.42/7195/5/abv5851.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/7195/4/abv5851.0001.001.tx
Flexibility in adaptation planning: When, where and how to include flexibility for increasing urban flood resilience
No full textThe magnitude and urgency of the need to adapt to climate change is such that addressing it has been taken up by the United Nations as one of the sustainable development goals - Goal 13 (SDG13) in 2015. SDG13 emphasises the need to strengthen resilience and adaptive capacity to climate related hazards and natural disasters. Coping with urban floods is one of the major needs of climate adaptation, where integration of climate change responses into flood risk management policies, strategies and planning at international, national, regional and local levels is now the norm. However, much of this integration lacks effectiveness or real commitment from stakeholders involved in adaptation planning and implementation. Hence this research has focused on integrating flexibility based adaptation responses into an urban flood risk management context. The research has synthesised flexible adaptation practices from several disciplines including information technology, automobile and aerospace manufacturing. The outcomes of the research are brought together in a framework for structuring local adaptation responses and an adaptation planning process based on flexibility concepts. The outcomes provide a way to assist with the identification of the appropriate nature and type of flexibility required; where flexibility can best be incorporated; and when is the most appropriate time to implement the flexible adaptation responses in the context of urban flooding.Dissertation submitted in fulfilment of the requirements of the Board for Doctorates of Delft University of Technology and of the Academic Board of the UNESCO-IHE Institute for Water Education.Hydraulic Structures and Flood Ris
Integração de um sistema de impressão 3D em uma arquitetura modular de posicionamento cartesiano
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2015A automação é uma das ferramentas utilizadas na adequação de uma estrutura produtiva para possibilitar melhorias e avanços tecnológico que torna-se cada vez mais importante. Neste trabalho são abordados os aspectos da automação existentes entre um sistema de Comando Numérico Computadorizado (CNC) baseado em Computador Pessoal (PC Â Personal Computer) e o processo de fabricação por impressão 3D. O aprimoramento de um posicionador é focado principalmente na integração entre os componentes mecânicos, eletroeletrônicos e computacionais com objetivo de garantir a flexibilidade de uso do sistema. Para conferir versatilidade ao CNC foi desenvolvido um Dispositivo Microcontrolado Auxiliar (DMA) para o sensoriamento e controle do processo. Baseado em projetos do tipo open source, o DMA é uma ferramenta com capacidade de ser modificada e adequada a diferentes utilizações em um ambiente de pesquisa. Para validar as soluções propostas para o posicionador optou-se pela aplicação do processo denominado Modelagem por Fusão e Deposição (FDM Â Fused Deposition Modeling), comumente associada ao termo impressão 3D. Neste processo um material termoplástico aquecido é extrudado através de um orifício e depositado camada a camada, permitindo a construção de modelos geométricos complexos. São apresentadas também soluções de automação para o processo de impressão 3D, que visam o baixo custo e fácil disponibilidade, bem como a possibilidade de integração com software e hardware existentes. Os resultados obtidos mostram que a programação orientada ao uso do DMA o torna uma ferramenta essencial para flexibilidade do equipamento CNC. Por meio dele é possível implementar funções como a leitura de sensores, processamento de informações e ações de controle sobre variáveis de processo. Os testes realizados com o equipamento mostram que as soluções apresentadas são capazes de executar o processo de impressão 3D. Dentro das limitações inerentes do processo é possível fabricar peças com geometrias variadas e com diferentes materiais. Conclui-se que o sistema proposto permite a automação de um processo produtivo como a impressão 3D e que as características finais obtidas são favoráveis ao uso em outros processos.Abstract : Automation is one of the tools used in the production suitability of a structure to enable technological advancements and improvements becomes increasingly important. This work discussed aspects of existing automation between a Computer Numerical Control (CNC) based on Personal Computer (PC) and the manufacturing process for 3D printing. The improvement of a positioner is primarily focused on the integration between the mechanical components, electronics and computer in order to ensure the flexibility of system use. To give versatility to the CNC we developed an Auxiliary Microcontrolled Device (DMA) for the sensing and control of the process. Based on the open source type projects, the DMA is a tool capable of being modified and suitable for different uses in a research environment. To validate the proposed solutions to the positioner was decided to process the application called Modeling Fused Deposition (FDM), commonly associated with the term 3D printing. In this process a heated thermoplastic material is extruded through a nozzle and deposited layer by layer, allowing the construction of complex geometric models. Also presented are automation solutions for the 3D printing process, aimed at low cost and easy availability as well as the possibility of integration with existing software and hardware. The results show that the programming oriented to the use of DMA makes it an essential tool for CNC machine's flexibility. Through it is possible to implement functions such as reading sensors, information processing and control actions on process variables. Tests conducted with the equipment show that the solutions are able to run the 3D printing process. Within the inherent limitations of the process it is possible to manufacture parts with different geometries and with different materials. It is concluded that the proposed system enables automation of a production process as 3D printing and that the final characteristics obtained are favorable for use in other processes
Journal of Proteomics & Bioinformatics- Open Access www.omicsonline.com Research Article JPB/Vol.2/July 2009 Molecular Characterization of Novel form of Type III Polyketide Synthase from Zingiber Officinale Rosc. and its Analysis using Bioinformatics Meth
No full textCopyright: © 2009 Radhakrishnan EK, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Enzymes of Type III polyketide synthase superfamily play an important role in the biosynthesis of medicinal natural products in plants. The PKSs generate the diversity of polyketide derivatives by changing their preference for starter molecules, the number of acetyl additions catalysed and the cyclisation of the polyketide intermediates. The amazing structural features of gingerol and related compounds of ginger (Zingiber officinale Rosc., Zingiberaceae) provide a genomic insight in to the presence of novel forms of PKS. The current study describes the isolation and characterisation of a novel of PKS from Z. officinale using degenerate oligonucleotide based PCR method. The inducible expression of recombinant ZoPKS in E. coli resulted in the formation of a protein with approximate molecular weight of 43kD. The comparative sequence and phylogenetic analysis of ZoPKS shows its significant variation from already identified PKSs. The novelty of the ZoPKS was further confirmed by homology modeling based comparative structural bioinformatics analysis. The novel form of PKS identified i
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