The title compound, C(16)H(14)O(5)·2H(2)O [systematic name: 5-hy-droxy-2-(4-hy-droxy-phen-yl)-7-meth-oxy-chroman-4-one dihydrate], is a natural phytoalexin flavone isolated from the native chilean species Heliotropium taltalense and crystallizes with an organic mol-ecule and two water mol-ecules in the asymmetric unit. The 5-hy-droxy group forms a strong intra-molecular hydrogen bond with the c...

This paper develops a new spectral approach to the estimation of the number of latent factors in large dimensional factor models. It shows that by imposing restrictions on the error terms we can derive a consistent procedure with improved finite sample performance in the presence of weak factors. The paper uses free probability theory to derive analytic expressions for the limiting moments of t...

The BeiDou Global Satellite Navigation System (BDS-3) broadcast newly developed B1C and B2a signals. To provide a better service for global users, the vertical phase center offset (PCO) variation (PCV) are estimated B1C/B2a ionospheric-free linear combination of BDS-3 inclined geostationary orbit (IGSO) medium earth (MEO) satellites in this study. And considering traditional PCC estimation meth...

Unemployment is one of the greatest economic and social problems in Turkey, as well it many other countries world. often explained by macroeconomic factors. However, demographic individual characteristics also have an effect on unemployment duration individuals, addition to The present study aims find factors that individuals Turkey with count data regression models. Therefore, examined Poisson...

Article history: Received 12 July 2010 Received in revised form 5 May 2011 Accepted 12 May 2011 Available online 18 May 2011 Traditional credit risk models adopt the linear correlation as a measure of dependence and assume that credit losses are normally-distributed. However some studies have shown that credit losses are seldom normal and the linear correlation does not give accurate assessment...

An extensive literature uses anthropometric measures, typically heights, to draw inferences about living standards in the past. This literature's influence reaches beyond economic history; the results of historical heights research appear as crucial components in development economics and related fields. The historical heights literature often relies on micro-samples drawn from sub-populations ...

A significant number of parameterizations for the polarized parton densities have appeared in the literature. Using the CTEQ evolution package, these distributions have been evolved consistently preparatory to compilation into an integrated package in the spirit of PDFLIB by Plothow-Besch. Here, a comparison of a few of the more recent distributions are made. Table 1: This is a partial listing ...

This paper studies the distribution of the classical t-ratio with data generated from distributions with no finite moments and shows how classical testing is affected by bimodality. A key condition in generating bimodality is independence of the observations in the underlying data generating process (DGP). The paper highlights the strikingly different implications of lack of correlation versus ...