Preinfluenza periods have been used to test for uncontrolled confounding in studies of influenza vaccine effectiveness, but some authors have claimed that confounding differs in preinfluenza and influenza periods. We tested this claim by comparing estimates of the vaccine-mortality association during the 2009/2010 influenza year, when there was essentially no circulation of seasonal influenza i...

the influence of aluminum on some serum parameters related to bone metabolism has been investigated by daily administration of aluminum over different periods of time. daily administration of aluminum (1 mg/kg bw) for 20 or 50 days elevated serum phosphorous concentration by 16 percent and had no significant effect on serum calcium level. when aluminum was injected as a complex with citric acid...

The role of experience in the development of the central visual pathways has been explored in the past through examination of the consequences of imposed periods of continuously abnormal or biased visual input. The massive changes in the visual cortex (area 17) induced by selected early visual experience, especially monocular deprivation (MD) or experience (ME) where patterned visual input is p...

[1] The real-time availability of satellite-derived precipitation estimates provides hydrologists an opportunity to improve current hydrologic prediction capability for medium to large river basins. Due to the availability of new satellite data and upgrades to the precipitation algorithms, the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis real-time estimates (...

Based on data from March 2008 to June 2020, we use the TVP-SVAR-SV model study time-varying impact of economic policy uncertainty Chinese commodity prices and analyze effect in different periods. The results show that: Firstly, has a significant prices, short-term is larger than long-term effect. Secondly, positively affects during stock market crash 2015; negatively global financial crisis Dec...

In this paper we present a number of measures that compare rankings of search engine results. We apply these measures to five queries that were monitored daily for two periods of about 21 days each. Rankings of the different search engines (Google, Yahoo and Teoma for text searches and Google, Yahoo and Picsearch for image searches) are compared on a daily basis, in addition to longitudinal com...