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Now showing items 141-150 of 193
What can be deduced from open cluster metallicity measurements?
(Oxford University Press, 2007)
The dependence of [Fe/H] on galactocentric distance, distance from the galactic mid-plane
and age is studied. Both ordinary least-squares and non-parametric regression in the form of a
‘generalized additive model’ are ...
Further observations of Hipparcos red stars and standards for UBV(RI)C photometry
(Oxford University Press, 2007)
We present homogeneous and standardized UBV(RI)C JHK photometry for over 100 M stars
selected from an earlier paper on the basis of apparent photometric constancy. L photometry
has been obtained for stars brighter than ...
Groundwater discharges to aquatic ecosystems associated with the Table Mountain Group (TMG) aquifer: a conceptual model
(Water Research Commission, 2008)
This paper reports on a conceptual model that was developed to describe the different groundwater discharge ‘types’ from
the Table Mountain Group (TMG) aquifer, that contributes to the different components of the flow ...
Snow impact on groundwater recharge in Table Mountain Group aquifer systems with a case study of the Kommissiekraal River catchment South Africa
(Water Research Commission, 2005)
Snowmelt in the mountainous areas of the Table Mountain Group (TMG) in South Africa is believed to be one of sources of
groundwater recharge in some winter seasons. This paper provides a scientific assessment of snow ...
Confidence intervals for the correlation between the gamma-ray burst peak energy and the associated supernova peak brightness
(Oxford University Press, 2009)
A strong correlation between the gamma-ray burster peak energy and the peak luminosity
of the associated supernova was discovered by Li for four GRBs. Despite the fact that the
formal significance level of the correlation ...
The detailed forms of the LMC Cepheid PL and PLC relations
(Oxford University Press, 2007)
Possible deviations from linearity of the Large Magellanic Cloud Cepheid period–luminosity
(PL) and period–luminosity–colour (PLC) relations are investigated. Two data sets are studied,
respectively from the Optical ...
The Nyquist frequency for time series with slight deviations from regular spacing
(Oxford University Press, 2009)
The paper is based on the notion that the Nyquist frequency νN is a symmetry point of the
periodogram of a time series: the power spectrum at frequencies above νN is a mirror image
of that below νN. Koen showed that the ...
The analysis of indexed astronomical time series – X. Significance testing of O − C data
(Oxford University Press, 2006)
It is assumed that O − C (‘observed minus calculated’) values of periodic variable stars are
determined by three processes, namely measurement errors, random cycle-to-cycle jitter in
the period, and possibly long-term ...
Biodegradation of high-concentration isopropanol by a solvent-tolerant thermophile, Bacillus pallidus
(Springer Verlag, 2002)
The aerobic biodegradation of high-concentration,
to 24 g l
–1
, 2-propanol (IPA) by a thermophilic isolate
ST3, identified as
Bacillus pallidus
, was successfully carried
out for the first time. This solvent-tolerant
B. ...
Purification, crystallization and preliminary X-ray diffraction analysis of thermostable nitrile hydratase: research letter
(Academy of Science of South Africa (ASSAf), 2004)
Microbial nitrile hydratases are important industrial enzymes
that catalyse the conversion of nitriles to the corresponding
amides. Bacillus strain RAPc8 nitrile hydratase has recently been
cloned and functionally ...