The polarimetric and photometric variability of Wolf-Rayet (WR) stars as caused by clumps in the winds, is revisited. In the model which is improved from Li et al. 2000, the radial expansion of the thickness is accounted for, but we retain the dependence on the β velocity law, stellar occultation effects. We again search for parameters that can yield results consistent with observations in rega...

We investigate the mass function of cold, dusty clumps in 11 lowand highmass star-forming regions. Using a homogeneous fitting technique, we analyze the shape of each region’s clump mass function and examine the commonalities among them. We find that the submillimeter continuum clump mass function in low-mass star-forming regions is typically best fit by a lognormal distribution, while that in ...

We present relation of the mean I-band brightness of red clump stars on metallicity. Red clump stars were proposed to be a very attractive standard candle for distance determination. The calibration is based on 284 nearby red giant stars whose high-quality spectra made it possible to determine accurate individual metal abundances. High-quality parallaxes (sigmapi&solm0;pi<10%) and photometry of...

Mobile ad hoc networks (MANETs) consist of mobile devices that form the wireless networks without any fixed infrastructure or centralized administration. The infrastructure based cellular architecture sets up base stations to support the node mobility. Mapping the concepts of base stations into MANET leads to the design of logical clump, where the clump heads in every clump play the role of bas...

Microarrays technology allows us to measure the expression level of hundreds of thousands of genes simultaneously. The microarrays data analysis process involves various heavy computational tasks such as clustering. The clustering can be defined as partitioning a dataset into groups where objects in the same group are similar in somehow. CLUMP (clustering through MST in parallel) is one of the ...

We have mapped a ∼ 5.5×5.5 pc portion of the M17 massive star-forming region in both 850 and 450 μm dust continuum emission using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT). The maps reveal more than 100 dusty clumps with deconvolved linear sizes of ∼0.05–0.2 pc and masses of ∼0.8–120 M⊙, most of which are not associated with known mid-infr...

We investigate the extended source size effects on gravitational lensing in which a lens consists of a smooth potential and small mass clumps (“substructure lensing”). We first consider a lens model that consists of a clump modeled as a singular isothermal sphere (SIS) and a primary lens modeled as an external background shear and convergence. For this simple model, we derive analytic formulae ...

The morphology of filamentous fungi closely correlates with the productivity in submerged culture. Using itaconic acid (IA) production by Aspergillus terreus as a research model, the quantitative relationship between the growth form of A. terreus and IA production was investigated. IA fermentation was scaled up from shake flasks to a 7 L stirred tank bioreactor based on the quantitative relatio...

We present a detailed analysis of the behaviour of the Red Clump K-band absolute magnitude (M K ) in simple and composite stellar populations, in light of its use as standard candle for distance determinations. The advantage of using M K , following recent empirical calibrations of its value for the solar neighbourhood, arises from its very low sensitivity to the extinction by interstellar dust...

The average near-infrared (K-band) luminosity of 238 Hipparcos red clump giants is derived and then used to measure the distance to the Galactic center. These Hipparcos red clump giants have been previously employed as I-band standard candles. The advantage of the K-band is a decreased sensitivity to reddening, and perhaps also a reduced systematic dependence on metallicity. In order to investi...