Drought is a significant challenge to semiarid Mediterranean grasslands, Increasing the accuracy of monitoring allows improving conservation and management these vital ecosystems. Meteorological drought commonly monitored by Standard Precipitation Index (SPI) or Evapotranspiration (SPEI). On other hand, agriculture estimated Vegetation Health (VHI). This work aims optimise correlation between b...

Based on the precipitation and potential evapotranspiration at 23 stations in Jilin Province, standardized index (SPEI) was calculated. run theory combined with previous research we redefine drought threshold, three characteristics, that is, duration, intensity, severity, were identified extracted. Two- three-dimensional copula functions selected to fit combine variables calculate joint recurre...

Reliability of systems used in spa e, avioni and biomedi al appli ations is highly riti al. Su h systems onsist of an analog front-end to olle t data, an ADC to onvert the olle ted data to digital form and a digital unit to pro ess it. It is important to analyze the fault sensitivities of ea h of these to e e tively gauge and improve the reliability of the system. This paper addresses the issue...

To facilitate the mapping of transposon insertion mutations in Caulobacter crescentus, we have used pulsed field gel electrophoresis to construct a detailed physical and genetic map of the C. crescentus genome. Restriction fragments were generated by DraI, AseI, or SpeI which cleave the C. crescentus 40, 13, and 26 times, respectively, and Tn5 insertions were used to align the restriction fragm...

The discriminatory power of four different DNA based typing methods was tested for the molecular subtyping of Salmonella Typhimurium phage type DT104 isolates. German DT104 strains (n = 133) originating from slaughter pigs were analysed by plasmid profiling, and 32 of them by pulsed-field gel electrophoresis (PFGE) using the restriction enzymes XbaI, SpeI or BlnI, random amplification of polymo...

In this study, the influence of the East Atlantic/Western Russia teleconnection pattern on the hydroclimatology of Europe, from mid-winter to late spring, is investigated. The influence of EAWR on the variability of precipitation (PP), temperature (TT) and standardized precipitation-evapotranspiration index (SPEI) is investigated on the base of correlation and stability maps. It is shown that E...

Due to the lack of a general drought definition, water users and managers have developed used different indices. Many studies using indices been made so as detect events or just compare their results assess advantages disadvantages. In Portugal, these done for common indices; however, an integrated evaluation comparison recent data is needed. Therefore, this study intended give updated overview...

Abstract Drought has a great impact on global terrestrial ecosystems. A large number of studies have shown that the drought vegetation growth lagged and cumulative effect, but it is unclear how much contributes to different types. Therefore, based standardized precipitation evapotranspiration index (SPEI) base version 2.5 Global Inventory Monitoring Modeling System (GIMMS3g) normalized differen...

This study presents developing procedures and verification of a new hybrid model, namely wavelet packet-genetic programming (WPGP) for short-term meteorological drought forecast. To this end, the multi-temporal standardized precipitation evapotranspiration index (SPEI) has been used as quantifying parameter at two stations Ankara province, Turkey. The WPGP model comprises main steps. In first s...