877 research outputs found
Voltammetric determination of tinidazole in pharmaceutical tablets using carbon paste electrode
Cyclic voltammetry was used to study the electrochemical behavior of tinidazole at carbon paste electrode. Tinidazole showed an irreversible reduction peak at about -440 mV. The differential pulse voltammetric peak current of tinidazole showed linear dependence on concentration in the range 5.0-200 μM with LOD and LOQ of 5.1 10-7 and 1.7 10-6 μM, respectively. Relative to most of the reported works on the determination of tinidazole, the developed method using carbon paste electrode which is an environmentally friendly, cheap, and simple working electrode exhibited linear dependence of peak current on concentration in the lower concentration region with relatively low LOD. Excellent recovery results with low % RSD for spiked standard tinidazole in tablet samples showed the potential applicability of the developed method for the determination of tinidazole in real samples. KEY WORDS: Carbon paste electrode, Differential pulse voltammetry, Tinidazole, Pharmaceutical tablets Bull. Chem. Soc. Ethiop. 2016, 30(1), 1-12.DOI: http://dx.doi.org/10.4314/bcse.v30i1.
The impact of smallholder farmers' participation in avocado export markets on the labor market, farm yields, sales prices, and incomes in Kenya
A Generalized Solution of Bianchi Type-V Models with Time-dependent and
We study the homogeneous but anisotropic Bianchi type-V cosmological model
with time-dependent gravitational and cosmological "constants". Exact solutions
of the Einstein field equations (EFEs) are presented in terms of adjustable
parameters of quantum field theory in a spatially curved and expanding
background. It has been found that the general solution of the average scale
factor R as a function of time involved the hypergeometric function. Two
cosmological models are obtained from the general solution of the
hypergeometric function and the Emden-Fowler equation. The analysis of the
models shows that for a particular choice of parameters in our first model, the
cosmological "constant" decreases whereas the Newtonian gravitational
"constant" increases with time, and for another choice of parameters, the
opposite behaviour is observed. The models become isotropic at late times for
all parameter choices of the first model. In the second model of the general
solution, both the cosmological and gravitational "constants" decrease while
the model becomes more anisotropic over time. The exact dynamical and
kinematical quantities have been calculated analytically for each model.Comment: 21 pages, 12 figures. Published versio
Guide to chicken health and management in Ethiopia: For farmers and development agents
Biotechnology and Biological Sciences Research Council, United KingdomDepartment for International Development, United Kingdo
Constrained evolution of effective equation of state parameter in non-linear dark energy model: Insights from Bayesian analysis of cosmic chronometers and Pantheon samples
We conduct a Bayesian analysis of recent observational datasets, specifically
the Cosmic Chronometers (CC) dataset and Pantheon samples, to investigate the
evolution of the EoS parameter in dark energy models. Our study focused on the
effective EoS parameter, which is described by the parametric form
, where and are model parameters.
This parametric form is applicable within the framework of gravity,
where represents the Ricci scalar and is the matter Lagrangian. Here,
we examine a non-linear model characterized by the functional form
, where is the free parameter of the
model. We examine the evolution of several cosmological parameters, including
the effective EoS parameter , the deceleration parameter , the
density parameter , the pressure , and the statefinder parameters. Our
analysis revealed that the constrained current value of the effective EoS
parameter, for both the CC and Pantheon
datasets, points towards a quintessence phase. Moreover, at redshift , the
deceleration parameter, , indicates that the
present Universe is undergoing accelerated expansion.Comment: The European Physical Journal Plus published versio
Status of the ANAIS Dark Matter Project at the Canfranc Underground Laboratory
The ANAIS experiment aims at the confirmation of the DAMA/LIBRA signal. A
detailed analysis of two NaI(Tl) crystals of 12.5 kg each grown by Alpha
Spectra will be shown: effective threshold at 1 keVee is at reach thanks to
outstanding light collection and robust PMT noise filtering protocols and the
measured background is well understood down to 3 keVee, having quantified K, U
and Th content and cosmogenic activation in the crystals. A new detector was
installed in Canfranc in March 2015 together with the two previous modules and
preliminary characterization results will be presented. Finally, the status and
expected sensitivity of the full experiment with 112 kg will be reviewed.Comment: Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs,
Zaragoza, June 22 to 26, 201
Background model of NaI(Tl) detectors for the ANAIS Dark Matter Project
A thorough understanding of the background sources is mandatory in any
experiment searching for rare events. The ANAIS (Annual Modulation with NaI(Tl)
Scintillators) experiment aims at the confirmation of the DAMA/LIBRA signal at
the Canfranc Underground Laboratory (LSC). Two NaI(Tl) crystals of 12.5 kg each
produced by Alpha Spectra have been taking data since December 2012. The
complete background model of these detectors and more precisely in the region
of interest will be described. Preliminary background analysis of a new 12.5 kg
crystal received at Canfranc in March 2015 will be presented too. Finally, the
power of anticoincidence rejection in the region of interest has been analyzed
in a 4x 5 12.5 kg detector matrix.Comment: Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs,
Zaragoza, June 22 to 26, 201
Production and relevance of cosmogenic radionuclides in NaI(Tl) crystals
The cosmogenic production of long-lived radioactive isotopes in materials is
an hazard for experiments demanding ultra-low background conditions. Although
NaI(Tl) scintillators have been used in this context for a long time, very few
activation data were available. We present results from two 12.5 kg NaI(Tl)
detectors, developed within the ANAIS project and installed at the Canfranc
Underground Laboratory. The prompt data taking starting made possible a
reliable quantification of production of some I, Te and Na isotopes with
half-lives larger than ten days. Initial activities underground were measured
and then production rates at sea level were estimated following the history of
detectors; a comparison of these rates with calculations using typical cosmic
neutron flux at sea level and a selected description of excitation functions
was also carried out. After including the contribution from the identified
cosmogenic products in the detector background model, we found that the
presence of 3H in the crystal bulk would help to fit much better our background
model and experimental data. We have analyzed the cosmogenic production of 3H
in NaI, and although precise quantification has not been attempted, we can
conclude that it could imply a very relevant contribution to the total
background below 15 keV in NaI detectors.Comment: Proceedings of the Low Radioactivity Techniques 2015 workshop, March
2015, Seattle (US
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