Monodispersed CdSe Nanorods nanoprticles with sufficient luminescence intensity have been prepared by chemical method in solution phase. CdSe as a core covered by Olic acide as an organic capping agent. The nanodots size obtained by two methods: dir
ectly from high resolution transmission electron microscopy (TEM) and using absorption peaks comparison with literature, the two methods are in good agreement. The optical properties and the luminescence intensity as a function of CdSe NRs concentration and the type of solvent (Chloroform and Toluene) have been investigated. The intensity of photoluminescence peak decreases and the peak shifts toward the blue energy side as the concentration reduced. The results show the relation between the polarity, the effect of surface, concentration, and the quantum effect on the optical properties.
Monodispersed CdSe nanoparticles with sufficient luminescence intensity have been prepared by chemical method in solution phase, and in two forms: CdSe as a core covered by Olic acide as an organic capping agent, while the second form is CdSe as a co
re covered by a layer of CdS (CdSe/CdS core shell). The nanodots size obtained directly from high resolution transmission electron microscopy (TEM) and absorption peaks using Paul Mulvaneys formula are in good agreement. The optical properties and the luminescence intensity as a function of CdSe concentration and the type of solvent have been investigated. The intensity of photoluminescence peak decreases and the peak shifts toward the blue energy side as the concentration reduced
The purpose of this study, is to explain the factors that may be able to affect the
prices of stocks in the IPO. So it could be priced at it's fair price, not less or more than it.
Which caused by the existence of asymmetric information between the
investors in the
financial market. Whereas, the asymmetric information generates adverse selection with
the investors, about the real values of the company and it's stocks in the IPO market.
This research aims to study the multiple signals, which could be used by the firm to
reduce the asymmetric information and highlight the real value of the firm and it's quality,
in Damascus Securities Exchange between (2009-2011). Some of these signals, which has
been considered in this research are: the standards of Financial and Non Financial
disclosure in it's prospectus.
The researcher reached to several results:
The Financial disclosure standards has no relation to the stock price in the Syrian
IPO market, and cannot be used as a signal to show the real value of the firm. On the other
hand Non-Financial disclosure standards could be used as a good signal to show the real
and fair price of the firms and their stocks in the IPO process.
This result could help the financial market and the firms who want to go public to
use this factors as a signal about it's quality, and for reduce the under pricing in their IPOs.
