definitions and methods of preparation

Ngày tải lên: 29/03/2014, 01:20

... market indices using standard methods as well as the most recent state -of- the-art methods. The analysis of the risk measures calculated by Riskometer on September 24, 2003 and January 9, 2004 and the corresponding ... concept of concordance and discordance which informally says that a pair of random variables are concordant if large values of one tend to be associated with large values of the other and small ... V., and N. Naik (2000), Generalised Style Analysis of Hedge Funds, Journal of Asset Management, 1, 1, 93-109. Agarwal V., and N. Naik (2000b), On Benchmarking of Hedge Funds with Passive and Option-based...

Ngày tải lên: 16/04/2013, 20:00

Ngày tải lên: 05/09/2013, 16:11

Ngày tải lên: 05/09/2013, 16:30

Ngày tải lên: 05/10/2013, 15:15

... analysis. 274 OVERVIEW AND COMPARISON OF BASIC ICA METHODS methods. In some cases, however, the algorithm and the estimation principle may be difficult to separate. The properties of the ICA method depend on both of ... Comparison of, say, the traces of the asymptotic variances of two estimators enables direct comparison of the accuracy of two estimators. One can solve analytically for the asymptotic variance of b b , ... variance of the first component of ^ q , denoted by ^ q 1 , is of a smaller order than the variance of the vector of other components, denoted by ^ q 1 . Excluding the first component in (A.1), and...

Ngày tải lên: 23/12/2013, 07:19

... somewhat expand. The dosimetric properties of the powder were studied. In the TL glow curve of LiF:Mg,Cu,Na,Si powder the main dosimetric peak appeared in the range of 227-247 o C and the ratio of the ... powder were studied. The main dosimetric peak of LiF:Mg,Cu,Na,Si appeared in the range of 227− 247 o C and the ratio of the height of the main peak to that of the other small peaks in the LiF:Mg,Cu,Na,Si is ... with rate of 4 l/min. After annealing treatment, the samples were washed with HCl solution. VNU Journal of Science, Mathematics - Physics 23 (2007) 225-231 Preparation and characteristics of LiF:Mg,Cu,Na,Si thermoluminescent...

Ngày tải lên: 13/02/2014, 04:20

... concentration of the SnCl 4 solution, and the films were annealed at different temperatures and for different period of time. Photoconductivity measurement In order to evaluate properties of obtained ... (R D ) and the light resistance (R L ) under the irradiation of 7W Hg lamp at the distance of 10cm were measured. The calculated ratio of R D /R L was considered as a photoconductivity of obtained ... results of measurements show that all values R L, R D, and R D /R L strongly depend on the temperature and time of annealing as presented in Fig. 4. P.V. Nho, T.K. Cuong / VNU Journal of Science,...

Ngày tải lên: 13/02/2014, 04:20

Ngày tải lên: 19/02/2014, 03:20

... (BBT), University of Twente, Netherlands. He is chair of Policy and Knowledge and editor-in-chief of Beleidswetenschap. His key research interests are in methods of policy analysis and science/policy ... assessments’ social and normative implications. David Laws and John Forester turn to the uses of dispute mediation and describe the practice and process of mediated negotiation in a world of plural perspectives ... professor of policy science at the Department of Political Science at the University of Amsterdam. He is also Director of the Amsterdam School for Social Science Research, and co- director of...

Ngày tải lên: 06/03/2014, 06:21

... Syllogism.  Chapter III. Of The Functions And Logical Value Of The Syllogism.  Chapter IV. Of Trains Of Reasoning, And Deductive Sciences.  Chapter V. Of Demonstration, And Necessary Truths. ... names of Sophroniscus, not indeed of him alone, but of him and each of an indefinite number of other human beings. Each of these names is applied to Sophroniscus for a different reason, and by ... definition of chemistry; and the definition of the science of life and organization is still a matter of dispute. So long as the sciences are imperfect, the definitions must partake of their...

Ngày tải lên: 06/03/2014, 13:20

Ngày tải lên: 08/03/2014, 12:20

... caused by changing of property and structure of solution. The changing property of solution may include firstly dielectric coefficient and surface tensity. The changing structure of solution was ... competition of hydration and solvation and for long chain molecule solvent, there appeared net-like of solvent molecules in water solution; that hampered molecules and ions association and crystals ... VNU Journal of Science, Natural Sciences and Technology 24 (2008) 227-232 227 Preparation of nano-structural MnO 2 in ethanol-water media coated on calcinated laterite and study of its arsenic...

Ngày tải lên: 14/03/2014, 10:20

Ngày tải lên: 14/03/2014, 13:20

... catalyst. The lengths of SiOx nanowires are in the range of several tens to hundreds of micrometers, and the diameters of nanowires are 20–80 nm. Transmission electron microscopy and high-resolution ... Preparation and photoluminescence of high density SiOx nanowires with Fe 3 O 4 nanoparticles catalyst X.J. Wang a, ⁎ , B. Dong b , Z. Zhou a a School of Electronics Engineering and Computer ... Since the majority of silicon oxide nanowires fabrication methods are catalyst-based methods, different kinds of catalysts have been used, such as Au, Pd–Au, Fe, Ga, Ga–In, Ni, In–Ni, Sn, and Co [2,3,7]. Magnetite...

Ngày tải lên: 16/03/2014, 15:11

... such as C–O, C=O and O – C=O which might stimulate formation of the composites, and enhance the interfacial combination of TiO 2 with carbon nanotubes. The formation of TiO 2 and its compounding ... Preparation and characterization of CNTs–TiO 2 composites Li Chen * , Bai-Lan Zhang, Mei-Zhen Qu, Zuo-Long Yu * Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, ... process of CNTs. Fig. 3 shows TEM image of CNTs–TiO 2 composites in which the black materials of different size absorbed onto Fig. 1. TEM image of as purified CNTs. Fig. 2. XPS spectrum of purified...

Ngày tải lên: 20/03/2014, 13:06

... the use of TEM apparatus and to Prof. T. Yoko, Institute for Chemical Research, Kyoto University for the use of XRD equipment. This work was supported by grant -in- aids from the Ministry of Education, ... images of the nanosheet TiO 2 calcined at 600 and 700 °C showed almost nanoparticles with a mixture of anatase and rutile TiO 2 structure (about 10–50 nm in diameter, at 600 °C, Fig. 6(g–h)), and ... pattern of the as-synthesized nanosheet TiO 2 and nanosheet TiO 2 calcined for 1 h at 300–700 °C. 2975S. Pavasupree et al. / Materials Letters 61 (2007) 2973–2977 surface area and pore volume of the...

Ngày tải lên: 20/03/2014, 13:06

... and angles) of O, W and Ti are expected but, not surprisingly, are too small to be detectable as shifts of W 4f and Ti 2p core level BEs and cannot be resolved in STM images. The appearance of ... supports makes it difficult to gain control of cluster size in preparing samples, and mass control of deposited species has been limited to soft-landing of gas-phase mass- selected charged species ... WO 3 nm À2 and metallic W. Fig. 2. Linear correlation of W NVV /Ti LMM AES ratio and W 4f intensity with amount of deposited WO 3 , the latter is plotted in units of WO 3 nm À2 based QCM measurement of...

Ngày tải lên: 20/03/2014, 13:06

... diameters of the rings, respectively) and t = 160–200 nm (t is the thickness of the rings or length of the tubes) nanorings due to the absence of the vortex states and the presence of out-plane and ... spectra of samples S2 (a) and S3 (b). can be exclusively indexed to ␣-Fe 2 O 3 , according to standard data (JCPDS 33-0664). In Fig. 1(b) and (c), the reflection peaks of XRD patterns of S2 and S3, ... think that sample S2 is Fe 3 O 4 and sample S3 is ␥-Fe 2 O 3 . Fig. 3 presents the SEM and TEM images of samples S1, S2 and S3. Fig. 3(a) and (b) show the morphologies of ini- tial synthesized ␣-Fe 2 O 3 nanotubes...

Ngày tải lên: 20/03/2014, 13:06