http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/6537 Sun, 17 May 2026 17:23:46 GMT 2026-05-17T17:23:46Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/8134 Title: Marcinkiewicz-Zygmund type law of large numbers for double arrays of random elements in Banach spaces Authors: L., van Dung; T., Ngamkham; N.D., Tien; A.I., Volodin Abstract: In this paper we establish Marcinkiewicz-Zygmund type laws of large numbers for double arrays of random elements in Banach spaces. Our results extend those of Hong and Volodin [6]. ?? Pleiades Publishing, Ltd., 2009. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/8134 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7419 Title: Raman spectroscopy of Cu doping in Zn1-xCoxO diluted magnetic semiconductor Authors: L.H., Hoang; N.T.M., Hien; N.H., Hai; P., van Hai; N.T., Khoi; I.-S., Yang Abstract: The room-temperature ferromagnetism and the Raman spectroscopy of the Cu-doped Zn1-xCoxO powders prepared by the sol-gel method are reported. The x-ray diffraction (XRD) data confirmed that the wurtzite structure of ZnO is maintained for ZnO doped with Co below 10 at%. The magnetization-field curves measured at room temperature demonstrated that all Co-doped ZnO powders were paramagnetic.Ferromagnetic ordering is observed for the samples doped with Cuin Zno.98Co0.02O and strongly depends on the concentration of Cu. The relative strength of the second-order LO peak to the firstorder one in the Raman spectra, which is related to the carrier concentration, of the Cu-doped Zno.98Co0.02 O powder is strongly correlated with the saturation magnetic moment of the system. This seems to be in favor of the Ruderman-Kittel-Kasuya-Yosida (RKKY) or double exchange mechanism of the ferromagnetism in this system. ?? 2009 John Wiley & Sons, Ltd. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7419 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7415 Title: Semi-traces and their application in concurrency control problem Authors: H.C., Thanh Abstract: The theory of traces was originated by A. Mazurkiewicz to model non-sequential behaviour of a distributed system. The normal form of a trace shows us an optimal way to execute a process occurred on the system. Nevertheless, the independence of actions in many systems is not static and depends on the history of the systems. To describe this fact, D. Kuske and R. Morin proposed a notion of local independence. Basing on the local independence, we introduce a notion of semi-trace, analyze its structure and the relationship between traces and semi-traces. Furthermore, we investigate some applications of semitraces in concurrency control problem. ?? 2009 Springer Berlin Heidelberg. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7415 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7414 Title: Growth of carbon nanotubes on stainless steel substrates by DC-PECVD Authors: D.Q., Duy; H.S., Kim; D.M., Yoon; K.J., Lee; J.W., Ha; Y.G., Hwang; Lee, C.H.; B.T., Cong Abstract: We report on the fabrication of carbon nanotubes (CNTs) on Ni-coated stainless steel (SUS) substrates by using dc plasma enhanced chemical vapor deposition. The synthesized CNTs have the diameter of about 30 nm and the length of about 1.2 ?m. To verify the effects of SUS substrates on the growth of CNTs, CNTs had also been grown on Ni-coated Si substrates. CNTs grown on the SUS substrates were more uniform compared with those grown on the Si substrates. Field emission properties of the CNT films were measured in the diode configuration, and the turn-on electric field of 3.87 V/?m and field enhancement factor ? of about 1737 were obtained from the synthesized CNTs at the gap of 500 ?m between the SUS substrate and the anode. These results have not only clarified the effects of the substrate on the growth of CNTs, but also shown the potential of CNTs in field emission applications, especially CNT-based cold-cathode X-ray tubes. ?? 2009 Elsevier B.V. All rights reserved. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7414 2009-01-01T00:00:00Z