2,638 research outputs found
Periodic Radio Variability in NRAO 530: Phase Dispersion Minimization Analysis
In this paper, a periodicity analysis of the radio light curves of the blazar
NRAO 530 at 14.5, 8.0, and 4.8 GHz is presented employing an improved Phase
Dispersion Minimization (PDM) technique. The result, which shows two persistent
periodic components of and years at all three frequencies,
is consistent with the results obtained with the Lomb-Scargle periodogram and
weighted wavelet Z-transform algorithms. The reliability of the derived
periodicities is confirmed by the Monte Carlo numerical simulations which show
a high statistical confidence. (Quasi-)Periodic fluctuations of the radio
luminosity of NRAO 530 might be associated with the oscillations of the
accretion disk triggered by hydrodynamic instabilities of the accreted flow.
\keywords{methods: statistical -- galaxies: active -- galaxies: quasar:
individual: NRAO 530}Comment: 8 pages, 5 figures, accepted by RA
Business Value of E-CRM: A Multi-Case Study of Applications in Manufacturing and Service Industry of Taiwan
: Since it is a well known fact that the cost to attract a new customer is approximately 5~10 times more than the cost of keeping existing clients for the enterprise, it is a very crucial issue for the business to focus on the need of customer relationship management. Therefore, e-CRM (electronic CRM) is widely accepted recently and the adopting rate in certain organization is up to 49% annually. In this study, a systematic multi-case study in Taiwan is performed for the B2B manufacturing industry and B2C service business in order to find the critical function and important issues for e-CRM in those businesses. In addition, the efficiency factors for e-CRM are analyzed since the roles of the clients in B2C and B2B are different, i.e., the organizational and personal behavior is compared. The preliminary results show e-CRM in Taiwan has been successfully improving the service for B2B and B2C and promoting closer relationship for both the sellers and buyers. The target of new customer acquiring is also improved effectivel
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