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Walker, Ian D.; Seaton, Jonathan S.

doi:10.4324/9780203073216.ch11

Cited by 25 publications

(36 citation statements)

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“…NGC 6649. has been studied previously by, for example, Madore & Van den Bergh (1975) and Walker & Laney (1986). The agreement between the photometry of this study and the photoelectric data of Madore & van den Bergh is good (see Table 3), with only small offsets in the U-and B-band.…”

Section: Discussion Of Individual Clusterssupporting

confidence: 85%

“…The absolute distance modulus, µ 0 , is found to be 11.06 ± 0.03 when individual stars are dereddened (R = 3 was assumed which implies µ = 15.2). Walker & Laney (1986) used U-, B-and V-band CCD data to study NGC 6649. Agreement between the photoelectric data of Madore & van den Bergh and Walker & Laney was found to be better than 0.03 mag in the V-band.…”

Section: Discussion Of Individual Clustersmentioning

confidence: 99%

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Distances to Cepheid open clusters via optical andK-band imaging

Hoyle

Shanks

Tanvir

2003

Monthly Notices of the Royal Astronomical Society

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We investigate the reddening and main‐sequence‐fitted distances to 11 young, Galactic open clusters that contain Cepheids. Each cluster contains or is associated with at least one Cepheid variable star. Reddening to the clusters is estimated using the U−B:B−V colours of the OB stars and the distance modulus to the cluster is estimated via B−V:V and V−K:V colour–magnitude diagrams. Our main‐sequence fitting assumes that the solar‐metallicity zero‐age main sequence of Allen applies universally to all the open clusters, although this point is controversial at present. In this way we proceed to calibrate the Cepheid period–luminosity (PL) relation and find MV=−2.87 × log P− 1.243 ± 0.09, MK=−3.44 × log P− 2.21 ± 0.10 and absolute distance moduli to the Large Magellanic Cloud (LMC) of 18.54 ± 0.10 from the V‐band and 18.48 ± 0.10 from the K‐band giving an overall distance modulus to the LMC of μ0= 18.51 ± 0.10. This is in good agreement with the previous Cepheid PL‐K result of Laney & Stobie at μ0= 18.51 ± 0.09 and with the Hipparcos parallax‐calibrated Cepheid PL‐K estimate of Feast & Catchpole at μ0= 18.66 ± 0.10 when no account is taken of the LMC metallicity. We also find that the two‐colour U−B:B−V diagrams of two important clusters are not well fitted by the standard main‐sequence line. In one case, NGC 7790, we find that the F stars show a UV excess and in the second case, NGC 6664, they are too red in U−B. Previous spectroscopic estimates of the metallicity of the Cepheids in these clusters appear to suggest that the effects are not due to metallicity variations. Other possible explanations for these anomalies are positional variations in the dust reddening law and contamination by foreground or background stars.

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Section: Discussion Of Individual Clusterssupporting

confidence: 85%

Section: Discussion Of Individual Clustersmentioning

confidence: 99%

Distances to Cepheid open clusters via optical andK-band imaging

Hoyle

Shanks

Tanvir

2003

Monthly Notices of the Royal Astronomical Society

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“…Several techniques have been proposed by researchers to recover oil from wastewater and these have merits as well as demerits. The techniques are adsorption, [14][15][16][17][18][19][20][21][22][23] flocculation, 24 coagulation, [25][26][27] electro-coagulation, 28 flotation, [29][30][31] membrane technique, [32][33][34][35] biological treatment, 36,37 etc. Existing methods for the treatment of oily wastewater before their disposal remain unsatisfactory because of their expensive or incomplete process.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of La³⁺ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion

Elanchezhiyan

Sivasurian

Meenakshi

2015

J of Applied Polymer Sci

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On the basis of the present study, the details of the recovery of cutting oil from oil‐in‐water emulsion using the modified forms of biopolymer chitosan viz., chitosan beads (CB), carboxylated chitosan beads (CCB), and lanthanum incorporated carboxylated chitosan beads (La‐CCB). Various oil sorption experiments were conducted using an extractive gravimetric method by optimizing various parameters such as contact time, pH, sorbent dosage, and initial oil concentration for maximum sorption. It was found that the oil removal percentage was comparatively less in the case of CB and CCB when compared with La‐CCB, which showed 85% of oil removal at acidic condition. The obtained adsorption equilibrium data was explained with Freundlich, Langmuir, D–R, and Tempkin isotherms to find the best fit for the sorption process. Thermodynamic parameters such as ΔG0, ΔH0, and ΔS0 were calculated in order to understand the nature of sorption process. The surface morphology and sorption of oil on the beads were confirmed by FTIR, SEM with EDAX, XRD, TGA, and DSC analysis. This work provides a potential platform for the expansion of oil removal technology. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43218.

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“…46 The use of spirnlactone in infants and children was first reported in 1964 when administration of the drug to three infants produced a moderate diuresis. 47 Since then spironolactone has been widely utilized in the management of congestive heart failure associated with congenital heart disease, 48-50 bronchopulmonary dysplasia or chronic lung disease and pediatric ascites. 51,56 Spironolactone can be analysed in plasma by several HPLC methods.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Atenolol, Rosuvastatin, Spironolactone, Glibenclamide and Naproxen Sodium in Pharmaceutical Formulations and Human Plasma by RP‐HPLC

Sultana

Arayne

Iftikhar

2008

J Chinese Chemical Soc

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A rapid and sensitive high‐performance liquid chromatographic method was developed and validated for the simultaneous determination and quantification of atenolol, rosuvastatin, spirnolactone, glibenclamide and naproxen sodium in bulk drugs, pharmaceutical formulations and in human plasma in the presence of internal standard (flurbiprofen). Chromatograms were developed with methanol and water (80:20, v/v) solvent system on a Purospher start, C18 (5 μm, 250 × 4.6 mm) column and pH was adjusted to 3.40 with ortho‐phosphoric acid. Mobile phase was pumped with a flow rate of 0.90 mL/minute with 235 nm UV detection. Standard curves were linear over the concentration range 0.25‐30 μg/mL−1. The coefficients of variation (C.V.%), were < 3% and LOD and LOQ were <0.0154 & 0.06 for inter‐ and intra‐day, respectively. The method was applied to drug interaction studies of atenolol with rosuvastatin, spironolactone, glibenclamide and naproxen to illustrate the scope and application of the methods to manage four different therapeutic classes of drugs, as they are co‐administered.

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R&D In Uk Quoted Companies

Cited by 25 publications

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Distances to Cepheid open clusters via optical andK-band imaging

Distances to Cepheid open clusters via optical andK-band imaging

Efficacy of La³⁺ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion

Simultaneous Determination of Atenolol, Rosuvastatin, Spironolactone, Glibenclamide and Naproxen Sodium in Pharmaceutical Formulations and Human Plasma by RP‐HPLC

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R&D In Uk Quoted Companies

Cited by 25 publications

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Distances to Cepheid open clusters via optical andK-band imaging

Distances to Cepheid open clusters via optical andK-band imaging

Efficacy of La3+ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion

Simultaneous Determination of Atenolol, Rosuvastatin, Spironolactone, Glibenclamide and Naproxen Sodium in Pharmaceutical Formulations and Human Plasma by RP‐HPLC

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Efficacy of La³⁺ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion