225 research outputs found
A Collaboration-Enabling Framework For Java Beans
No full textOF THE THESIS A Collaboration-Enabling Framework for Java Beans by Senthilkumar Sundaram Thesis Director: Professor Ivan Marsi'c Most of the existing collaborative applications are collaboration aware, i.e., collaboration semantics are interleaved into application semantics. This thesis contributes: ffl A generic collaboration bus to which any (including single-user) applications can be plugged in as is and made collaborative without any modification to the application or to the collaboration bus. This collaboration framework eliminates several drawbacks suffered by the existing "generic frameworks." ffl A set of guidelines and methods for writing wrappers around the single-user applications in order to make them collaboration aware so they can take advantage of the cooperative features of the bus. ffl Design guidelines for developing special purpose applications to be aware of the proposed bus and to enable them to manage the cooperative features of the bus effectively. The additional..
Leifsonia soli sp. nov., a yellow-pigmented actinobacterium isolated from teak rhizosphere soil
No full textTwo yellow-pigmented, Gram-stain-positive, aerobic, motile, short rod-shaped bacteria were isolated from natural teak tree rhizosphere soil and their taxonomic positions were determined by using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strains TG-S248 T and TG-S240 formed a distinct phyletic line within the genus Leifsonia. 16S rRNA gene sequence analysis of strain TG-S248T with sequences from Leifsonia shinshuensis DB 102T, L. poae VKM Ac-1401T, L. naganoensis DB 103T, L. aquatica DSM 20146T and L. xyli subsp. cynodontis JCM 9733T revealed pairwise similarities ranging from 98.7 to 99.1 %. The major fatty acids were anteiso-C15 : 0, anteiso-C17 : 0 and iso-C 16 : 0. The G+C content of the DNA of the type strain was 69.4 mol%. DNA-DNA hybridization experiments revealed low levels of DNA-DNA relatedness (32% or less) between strain TG-S248T and its closest relatives. Based on differences in phenotypic and genotypic characteristics, strain TG-S248T (=LMG 24767T =JCM 15679T) is designated the type strain of a novel species of the genus Leifsonia, for which the name Leifsonia soli sp. nov. is proposed.open
Mucilaginibacter gossypii sp. nov. and Mucilaginibacter gossypiicola sp. nov., plant-growth-promoting bacteria isolated from cotton rhizosphere soils
No full textTwo isolates from rhizosphere soil of cotton, designated Gh-67T and Gh-48T, which produced large amounts of extracellular polysaccharide and possessed plant-growth-promoting traits, were characterized phenotypically and genotypically. The strains were Gram-negative and cells were non-motile rods that grew optimally at 28 °C and grew between pH 4 and 7. 16S rRNA gene sequence analysis of strains Gh-67T and Gh-48 T placed them in the genus Mucilaginibacter, with pairwise sequence similarity between them and type strains from related genera ranging from 93.9 to 98.2 %. The major fatty acids were iso-C15 : 0, C16 : 0 and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). The strains contained MK-7 as the major isoprenoid quinone. The DNA G+C contents of strains Gh-67T and Gh-48T were 46.7 and 44.2 mol%, respectively. The low DNA-DNA hybridization value (18 %) and a number of phenotypic differences between strains Gh-48T and Gh-67T indicated that they represent two separate species. Results of phenotypic, phylogenetic and genotypic analysis revealed that the strains were separated from the species of Mucilaginibacter described to date. Therefore, strains Gh-67T and Gh-48T represent novel species of Mucilaginibacter, for which we propose the names Mucilaginibacter gossypii sp. nov. (type strain Gh-67T =NCIMB 14470T =KCTC 22380 T) and Mucilaginibacter gossypiicola sp. nov. (type strain Gh-48 T =NCIMB 14471T =KCTC 22379T).open
Interplay of polymer and oligonucleotide properties in the nature of antisense effects
No full textAntisense oligonucleotides can be utilized to silence the expression of a target gene via sequence-specific complementary base pairing. Antisense technology is applied as a basic research tool and is being developed therapeutically for a wide range of indications including cancer, inflammatory diseases and viral diseases. Its widespread application is impeded by the poor cellular delivery of oligonucleotides (ONs). Rational design of carriers for enhanced ON delivery demands a better understanding of the role of the vector on the extent and time course of antisense effects. This work highlights the interplay of polymer and ON properties in the nature of polymer mediated antisense responses. First, we demonstrate that ON structure exerts a significant influence on the strength of ON binding to, and dissociation from, the cationic polymer, poly-L-lysine. The finding implicates secondary structure as a relevant design parameter for antisense ONs and stresses the need for a comprehensive evaluation of ON-polymer structure-activity effects. Next, using well-characterized cationic polymer polyethyleneimine (PEI), we focus on understanding the effects of polymer molecular weight (MW) and ON backbone chemistry on antisense activity. We measure physico-chemical properties of complexes between PEI and phosphodiester and phosphorothioate backbone ONs, and evaluate their ability to deliver ONs to cells, leading to an antisense response. Our key finding is that the antisense activity is not determined solely by PEI MW or by ON chemistry, but rather by the interplay of both factors. Of particular importance is the strength of interactions between the carrier and the ON, which determines the rate at which the ONs are delivered intracellularly. Finally, we utilize the chemistry of the ONs as a means to influence the strength of interactions between PEI and ONs, and hence control the final antisense response. We show that it is possible to improve dramatically the efficiency of lower PEI MWs as ON carriers by manipulating the degree of phosphorothioate substitution in the ON chemistry. By correlating the PEI MW & ON chemistry with the observed antisense effects, we draw insightful structure-property relationships that will aid the rational design of ON carriers.Ph.D.Includes bibliographical references (p. 129-137)
Dataset for figures in paper DOI:/10.1016/j.cattod.2015.09.031
No full text<p>Datasets for figures in the publication "</p>
<p>Facile synthesis of palladium phosphide electrocatalysts and their activity for the hydrogen oxidation, hydrogen evolutions, oxygen reduction and formic acid oxidation reactions"</p>
<p>Anthony R.J. Kucernak†, K. Fahy, V. N. Naranammalpuram Sundaram</p>
<p>Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom</p>
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<p>† Corresponding author, [email protected], Phone: +44 20 75945831, Fax: +44 20 75945804</p>
<p>Published in Catalysts Today, 2015.</p>
<p>Please cite this paper DOI:/10.1016/j.cattod.2015.09.031 when referencing this data</p>
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Distributed spectrum coordination for multi-radio platform co-existence: an experimental study on the orbit testbed
No full textThis thesis presents an experimental investigation of algorithms for protocol-assisted spectrum coordination of multi-radio platforms in a dense radio environment. With increasing proliferation of new wireless technologies and radio standards such as 802.11b/g, Bluetooth, Zigbee, UWB, WiMax etc, multi-radio devices such as laptop computers, cell phones and PDA's will need to co-exist in shared unlicensed frequency bands.
The common spectrum coordination channel (CSCC) protocol has previously been proposed as a method for nearby devices to exchange spectrum usage and traffic information necessary to execute decentralized co-existence algorithms. This work focuses on the application of CSCC to dense deployments of multi-radio platforms with both 802.11 WLAN and Bluetooth in a typical office/SOHO type environment. Distributed spectrum coordination algorithms listen to these CSCC announcements from radios within range, and back off their transmission parameters to avoid contributing excessive interference. We have developed a set of distributed coordination algorithms, with the objective of achieving efficient co-existence between interfering radios while maintaining acceptable QOS (Quality of Service) at every node.
Specific coordination algorithms considered include Bluetooth defer-transfer (Bo), Simple Source Rate adaptation (Rt), distance based SIR link budget rate adaptation (SIR-BT). Each of these algorithms is defined and evaluated using dual-radio nodes on the 400-node ORBIT radio grid. System performance parameters obtained from the experiments are throughput, file transmission delay (for TCP) and quality of data/audio/video streams (for UDP).
Experimental results are given for a number of device densities and topologies. Significant degradation in throughput and application performance is observed without spectrum coordination. The proposed CSCC-based coordination algorithms are shown to provide significant performance gains, both in terms of system throughput and application level parameters. Overall, for the scenarios considered, the proposed coordination algorithms provide ~50-100% improvement in system throughput when compared to the case with no coordination.M.S.Includes bibliographical references (p. 37-38)
Calibration of the Das, Foresi, Balduzzi and Sundaram three-factor short rate model
No full textThis work is about one specific short-rate model, the Das, Foresi, Balduzzi and Sundaram three-factor short-rate model. The literature states, that this model is able to fit different shapes of rate curves with the three factors contributing in different ways to the shape of the rate curve. We test different numerical methods to calculate the discount factors from the model parameters. Using the best method we fit in the model to different zero rate curves and we can confirm the fact, that the model fits well the different rate curve shapes. We develop a Monte-Carlo based pricing method for this model and we fit the model parameters to different cap volatility curve and to swaption volatility surfaces. Due to the inaccuracy of the pricing function the fits are inaccurate in the case of the swaption surfaces, but in the case of the ATM cap curve we were able to reproduce the shapes of the curves and achieve acceptable fits. Furthermore we present simultaneous fit to the cap curve and to the zero rate curve, and we also propose two methods to fit the model to historical time series. With the fitted parameters and with the same market price of risk functions, which the author used, we fit the parameters of the market price of risk to the current rate curve
Design and Development of LVDC Cables
No full textThe current energy systems with the mix of renewable and conventional sources are already working on their maximum capacity in order to meet the existing demand. In the near future to meet the burgeoning demand, the future electrical power system would be a mix of both AC and DC systems coexisting with each other. With the fast paced development of smart grids, decentralised system and micro grids, there is an increasing interest in the LVDC (Low Voltage Direct Current) distribution. Also there is increase in the loads in the residential and commercial sector side that require DC supply inherently. To tap in and realise the potential of the LVDC distribution systems, it requires the appropriate infrastructures to be developed that supports its assimilation faster. This thesis “The Design and development of LVDC cable” is a step forward in realising the potential that DC has in the LV distribution side. This research is done in collaboration between TU Delft and the Prysmian Group. To begin with, two LVDC statespace based dynamic distribution system model namely: a neighbourhood distribution system and a ship distribution system are formed. The LVDC cables are incorporated as lines into these models. The sensitivity and stability analyses are performed by varying each of the active parameters individually, the influence that each of the active parameter has on node voltages, line currents and the stability of the system are studied and the trend is absorbed through this analysis. This analysis is set to be performed in both distribution systems under monopolar and bipolar configuration.Subsequently, the short circuit analysis i.e the pole to pole and pole to neutral fault analysis is also performed on both the neighbourhood and ship distribution system. Here the cable’s active parameters that are expected to have an influence on the system performance and the line current during short circuit are taken into consideration. These active parameters are varied throughout this analysis and the resulting plots are further analysed to study their influence. These active parameters are cable resistance, cable inductance, cable capacitance, and cable length. The observations are tabulated for each of the active parameters individually. The generated results from this study would support in better assessment of cable’s active parameters influence on the short circuit current and designing the LVDC cables. The accuracy of the dynamic model are validated by breaking the distribution system model into smaller sections and forthcoming results are compared to get the model accuracy. Finally based on the results from the sensitivity stability and short circuit analyses the optimal characteristics of the LVDC cables is formulated. Electrical Engineering | Electrical Power EngineeringElectrical Engineering | Sustainable Energy Technolog
Optimization of scale-up of KNLN piezocomposites: for flexible haptic feedback applications
No full textIn this thesis, we focus on flexible haptic feedback applications which rely on the sensation of touch to display a feedback to the user that establishes a system to user interaction. Piezocomposites made of piezoceramic and polymer phases can be used here due to their high flexibility and piezoelectric properties that enable them to deform under an electric field. A lead-free piezoceramic: KNLN-3 has been chosen as the ceramic phase due to lead-based ceramics having issues with toxicity and dielectric mismatch in composites. A flexible polymer: CFE was chosen as the polymer phase due to its high dielectric constant that decreases the dielectric mismatch to the maximum extent. The first objective of this thesis is to optimize the scale-up in production of KNLN-3 when employed as a random 0-3 composite. Thus, the production of KNLN-3 was analyzed with respect to the microstructure, purity, surface topology, poling, lithium content, precursors used and correlated with its performance in a composite. Based on this set of data, an optimized powder was obtained. The second objective of thesis was to perform mechanical tests on a composite made with this powder to obtain mechanical properties that quantify its effectiveness as a flexible haptic feedback device. From these tests, the optimized powder was seen to be the most ideal when it was employed as an R50 (0-3 composite with 50 % filler) composite with no glass fibres used during production.Aerospace Engineering | Structures and Material
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