نتایج جستجو برای: variation trend
تعداد نتایج: 411878 فیلتر نتایج به سال:
Understanding the differences between microarray and RNA-Seq technologies for measuring gene expression is necessary for informed design of experiments and choice of data analysis methods. Previous comparisons have come to sometimes contradictory conclusions, which we suggest result from a lack of attention to the intensity-dependent nature of variation generated by the technologies. To examine...
abstract urban expansion, pollution augmentation, and extention of major industrial activities in metropolitan areas impacted local climates of major cities. transforming big cities into heat islands is one of the most prominent results of such a micro-climate change. in this study, variation of precipitation, temperature and some other important climatic parameters including relative humidity,...
Nuclear DNA content variation over orders of magnitude across species has been attributed to 'junk' repetitive DNA with limited adaptive significance. By contrast, our previous work on Silene latifolia showed that DNA content is negatively correlated with flower size, a character of clear adaptive relevance. The present paper explores this relationship in a broader phylogenetic context to inves...
Cohort studies can be biased by unmeasured confounding. We propose a hybrid ecologic-epidemiologic design called the trend-in-trend design, which requires a strong time trend in exposure, but is unbiased unless there are unmeasured factors affecting outcome for which there are time trends in prevalence that are correlated with time trends in exposure across strata with different exposure trends...
A four stage social network trend mining framework, the IGCV (Identification, Grouping, Clustering and Visualisation) framework, is described. The framework extracts trends from social network data and then applies a sequence of techniques (“tools”) to this data to facilitate interpretation of the identified trends. Of particular note is the visualisation of trend migrations (changes) that feat...
Using three measures, namely, the standard deviation of the ratio of the deficit to GDP and the slope and standard error of the estimate of regressing this ratio on time, Brewer (1985) concludes that the developing countries’ deficits, as a group, are not notably larger or more unstable than the industrial countries’ deficits. This comment demonstrates that by using a more appropriate measure o...
Surface air temperature (SAT) from four reanalysis/analysis datasets are analyzed and compared with the observed SAT from 11 stations in the Antarctic. It is found that the SAT variation from Goddard Institute for Space Studies (GISS) is the best to represent the observed SAT. Then we use the sea ice concentration (SIC) data from satellite measurements, the SAT data from the GISS dataset and st...
Utilizing tender resonant X-ray scattering, resonance effects in twist bend nematic phase were deciphered quantitatively. Distinct helical pitch variation trend between symmetric/asymmetric dimers was further analysed by DFT computation.
Soil total nitrogen (STN) and total phosphorus (STP) are important indicators of soil nutrients and the important indexes of soil fertility and soil quality evaluation. Using geographic information system (GIS) and geostatistics, the spatial heterogeneity distribution of STN and STP in the Yaoxiang watershed in a hilly area of northern China was studied. The results showed that: (1) The STN and...
The Yunnan pine (Pinus yunnanensis Franch.) is one of the primary forest vegetation types in Province and has prominent economic value ecological significance. Monitoring changes forests contributes to their health management. normalized differential index (NDVI) an essential indicator for studying regional change. Landsat images were used analyze NDVI rainy dry seasons as well from 2009 2020. ...
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