3,626 research outputs found
Wavelength converter sharing in asynchronous optical packet/burst switching: An exact blocking analysis for markovian arrivals
Cataloged from PDF version of article.In this paper, we study the blocking probabilities
in a wavelength division multiplexing-based asynchronous
bufferless optical packet/burst switch equipped with a bank of
tuneable wavelength converters dedicated to each output fiber
line. Wavelength converter sharing, also referred to as partial
wavelength conversion, corresponds to the case of a number
of converters shared amongst a larger number of wavelength
channels. In this study, we present a probabilistic framework for
exactly calculating the packet blocking probabilities for optical
packet/burst switching systems utilizing wavelength converter
sharing. In our model, packet arrivals at the optical switch are
first assumed to be Poisson and later generalized to the more
general Markovian arrival process to cope with very general
traffic patterns whereas packet lengths are assumed to be exponentially
distributed. As opposed to the existing literature based
on approximations and/or simulations, we formulate the problem
as one of finding the steady-state solution of a continuous-time
Markov chain with a block tridiagonal infinitesimal generator. To
find such solutions, we propose a numerically efficient and stable
algorithm based on block tridiagonal LU factorizations. We show
that exact blocking probabilities can be efficiently calculated
even for very large systems and rare blocking probabilities, e.g.,
systems with 256 wavelengths per fiber and blocking probabilities
in the order of 10−40. Relying on the stability and speed of the
proposed algorithm, we also provide a means of provisioning
wavelength channels and converters in optical packet/burst
switching systems
Improvement of the Wastewater Biodegradability by Means of Photocatalytic and Wet Oxidation Processes in the Presence of Hydrogen Peroxide
In this study, the effectiveness of photocatalytic oxidation (PO) and wet oxidation (WO) processes as a pre-treatment step on improvement of biodegradability and colour removal of mixture of raw domestic and pre-treated industrial wastewaters, have been
evaluated. More oxygen was obtained by H2O2 (as an oxidant in WO and PO processes) than stoichiometric demand. PO of the wastewater was carried out by illumination of the wastewater with UV lamp (at room temperature, atmospheric pressure, 16.5 h reaction time) and WO of the wastewater was carried out by means of thermal oxidation at autoclave conditions (at 118–120 oC, 1.9–2 bar, 3 h reaction time). 1 g L–1 TiO2 in PO process and 0.2 mg L–1 Cu++ in WO process were used as catalyst. The results obtained from experiments were not compared with each other due to the difference between the
quality and quantity of the used catalyst and the consumed energy. Colour removal efficiency was 33 % for WO process and 77.6 % for PO process. By applying WO process, 72.7 % increase in the reaction rate coefficient describing the degradability of organic compounds in wastewater was obtained, but this value was 34.5 % in PO process
Method development and validation for the determination of cabergoline in tablets by capillary zone electrophoresis
A capillary zone electrophoresis (CZE) method has been developed for the analysis of cabergoline in its pharmaceutical preparations. Optimized analysis conditions for cabergoline analysis were performed using 110 mM pH 5.0 phosphate buffer containing 30 % acetonitrile as an electrolyte solution. Separation was performed through a fused silica capillary (50 μm i.d., total length 64.5 cm, 50.0 cm effective length) at 30 ºC with an applied voltage of 30 kV and hydrodynamic injection for 4 s. Cabergoline and internal standard verapamil were detected at a wavelength of 220 nm. The calibration was liner from 5.0 to 90.0 μg mL–1 and the limit of detection and quantification were 1.25 and 3.77 μg mL–1 Optimized CE . method was validated on the basis of related ICH guideline and found as an accurate, sensitive, precise and reproducible method for cabergoline determination. Developed method is also successfully applied for the analysis of pharmaceutical preparations containing cabergoline.Colegio de Farmacéuticos de la Provincia de Buenos Aire
Method development and validation for the determination of cabergoline in tablets by capillary zone electrophoresis
A capillary zone electrophoresis (CZE) method has been developed for the analysis of cabergoline in its pharmaceutical preparations. Optimized analysis conditions for cabergoline analysis were performed using 110 mM pH 5.0 phosphate buffer containing 30 % acetonitrile as an electrolyte solution. Separation was performed through a fused silica capillary (50 μm i.d., total length 64.5 cm, 50.0 cm effective length) at 30 ºC with an applied voltage of 30 kV and hydrodynamic injection for 4 s. Cabergoline and internal standard verapamil were detected at a wavelength of 220 nm. The calibration was liner from 5.0 to 90.0 μg mL–1 and the limit of detection and quantification were 1.25 and 3.77 μg mL–1 Optimized CE . method was validated on the basis of related ICH guideline and found as an accurate, sensitive, precise and reproducible method for cabergoline determination. Developed method is also successfully applied for the analysis of pharmaceutical preparations containing cabergoline.Colegio de Farmacéuticos de la Provincia de Buenos Aire
Modelling the dynamics of intramammary E. coli infections in dairy cows: understanding mechanisms that distinguish transient from persistent infections
The majority of intramammary infections with Escherichia coli in dairy cows result in transient infections with duration of about 10 days or less, although more persistent infections (2 months or longer) have been identified. We apply a mathematical model to explore the role of an intracellular mammary epithelial cell reservoir in the dynamics of infection. We included biological knowledge of the bovine immune response and known characteristics of the bacterial population in both transient and persistent infections. The results indicate that varying the survival duration of the intracellular reservoir reproduces the data for both transient and persistent infections. Survival in an intracellular reservoir is the most likely mechanism that ensures persistence of E. coli infections in mammary glands. Knowledge of the pathogenesis of persistent infections is essential to develop preventive and treatment programmes for these important infections in dairy cows
Karyotype analyses of the species of the genus Jurinea Cass. (Compositae) in Turkey
In this study, karyotype analyses of 13 species belonging to the genus Jurinea Cass. (Compositae) and grown naturally in Turkey were conducted. These taxa include Jurinea alpigena C. Koch, Jurinea ancyrensis Bornm., Jurinea aucherana DC., Jurinea cadmea Boiss., Jurinea cataonica Boiss. and Hausskn., Jurinea consanguinea DC., Jurinea cypria Boiss., Jurinea macrocalathia C. Koch., Jurinea macrocephala DC., Jurinea mollis (L.) Reichb., Jurinea pontica Hausskn. and Freyn ex Hausskn., Jurinea pulchella DC., Jurinea ramulosa Boiss. and Hausskn. Karyotype analysis of all the species are introduced to the scientific community for the first time and they were obtained through an Image analysis system. The study has made contribution to the cytotaxonomic revision of the genus Jurinea in Turkey.Key words: Asteraceae, Image analysis, Jurinea, karyotype, Turkey
Have Usability and Security Trade-offs in Mobile Financial Services (MFS) become Untrustworthy?
The trade-off between Usability and Security has been well researched with various models
proposed on how best to improve Usability without jeopardizing Security and vice visa. Usable
Security has become a key factor in Mobile Financial Services (MFS), the new frontier for mobile
phones utilisation. However, have the compromises gone too far? The trustworthiness of MFS
system has already slowed down new adoption and impacted ongoing security trust issues and
user confidence in spite of potential MFS benefits for its users. To understand this growing lack of
trust with MFS, we need to comprehend the nature of Usable Security in assuring the behaviours of
MFS users and determine the right trade-off to improve trust whilst facilitating future uptake. We
conducted an empirical survey of 698 user’s experience of MFS and here present our findings of
this investigation for further synthesis towards proposing practical control elements to assure
Usable Security in MFS
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