نتایج جستجو برای: شاخص spei
تعداد نتایج: 75015 فیلتر نتایج به سال:
از میان پدیدههای اقلیمی که جوامع و محیط زیست را متاثر میسازند، خشکسالی آب و هوایی یکی از پیچیدهترین آنها است. این ویژگی شناخت هر چه بیشتر جوانب گوناگون آن را ضرورت میبخشد. هدف از انجام این پژوهش بررسی برخی از ویژگیهای خشکسالی آب و هوایی بهویژه شدت آنها در ایستگاههای هواشناسی کرمان و شیراز است. پس از تهیه دادههای ساعتی مربوط به میانگین، بیشینه و کمینه دما و نیز میانگین بارش برای ایستگاه...
Flash drought is the result of strong precipitation deficits and/or anomalous increases in atmospheric evaporative demand (AED), which triggers a rapid decline soil moisture and stresses vegetation over short periods time. However, little known about role AED development flash droughts. For this paper, we compared standardized index (SPI) based on precipitation, (EDDI) AED, evaporation (SPEI) d...
Based on the data of 82 meteorological stations and six representative hydrological in four provinces Southwest China (Guizhou, Sichuan, Yunnan, Chongqing), this paper uses standardized precipitation evapotranspiration index (SPEI) runoff (SRI) to analyze spatial temporal evolution characteristics drought study area from 1968 2018. Combined with monsoon historical data, correlation applicabilit...
To increase the accuracy of drought prediction, this study proposes a forecasting method based on Informer model. Taking Yellow River Basin as an example, accuracies Autoregressive Integrated Moving Average (ARIMA), Long Short-Term Memory (LSTM), and models multiple timescales Standardized Precipitation Evapotranspiration Index (SPEI) were compared analyzed. The results indicate that, with incr...
PacI and SpeI restriction maps were obtained for the two chromosomes of each of the six species of the genus Brucella: B. melitensis, B. abortus, B. suis, B. canis, B. ovis, and B. neotomae. Three complementary techniques were used: hybridization with the two replicons as probes, cross-hybridization of restriction fragments, and a new mapping method. For each type strain, a unique I-SceI site w...
The aim of this study is to analyze the characteristics of drought such as intensity, cumulative curves and trends, based on SPEI (Standardized Precipitation Evapotranspiration Index) at 8 stations in Korea from 1981 to 2010. The traditional SPEI is based on Thornthwaite equation for estimating evapotranspiration; SPEI_th. However, a standard of agricultural water management in Korea suggests F...
Plant viral-based expression system offers an alternative tool for the expression of various target proteins via stable transformation or transient expression in plants. In transient expression strategy, generation of in vitro viral transcripts through complete linearization of the recombinant vector containing the cloned gene is crucial to ensure the success of gene expression in plants. Hence...
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