1,721,036 research outputs found
Unit roots, Granger causality and global warming: bridging the gap between econometric theory and climatology
No full textIn the last few years, improved mathematical modeling and abundance of data, strengthened the conclusion that human emissions are very likely to cause serious climate change. The adoption of Granger causality test applied to temperature and CO2 emissions series, allowed us to analyze the nature of such association
Granger Causality Analysis of Bivariate Climatic Time Series: a Note on the Role of CO2 Emissions in Global Warming
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The oxidative and hydrolytic degradation of the lipid fraction of ripened sausages as influenced by the raw material
No full textAbstract: An experimental investigation was conducted to assess the actual degree of oxidative degradation
of the lipid fraction of 30-day-ripened sausages using both commonly used investigations and nonconventional
means, such as the high-performance size-exclusion chromatography analysis of polar
compounds. Sausages made from pork shoulders from extensive and intensive pig rearing were considered.
The obtained results showed a high degree of primary oxidative degradation of the sausage lipid fraction,
as evidenced by oxidized triacylglyrerol and peroxide values, while a low secondary oxidation of fats
was found, as evidenced by triacylglycerol oligopolymers and 2-tiobarbituric acid test values. Moreover,
the degree of oxidative degradation did not show any significant difference between the two types of
sausage, although the samples prepared from extensively reared pigs, as compared with those from
intensively reared pigs, showed significantly (p < 0.001) higher contents of polyunsaturated fatty acids and
significantly (p < 0.01) lower amounts of saturated fatty acids
Assessment of the oxidative and hydrolytic degradation of the lipid fraction of mortadella by means of HPSEC analyses of polar compounds
No full textThe aim of this work was to use the HPSEC analysis of polar compounds to assess the level of oxidative and hydrolytic degradation of the lipid fraction of mortadella. The results indicated high primary oxidative degradation of the lipid fraction in the samples, with a mean value for oxidized triacylglycerols of 1.77%, and low secondary oxidation, with a mean value for triacylglycerol oligopolymers of 0.16%. In addition, in some cases, significant hydrolytic degradation was found. HPSEC analysis of polar compounds, to evaluate the level of oxidative and hydrolytic degradation of the mortadella lipid fraction, could be used as an alternative to commonly used techniques, some of which are not always reliable
Role of the natural and anthropogenic radiative forcings in global warming: evidence from cointegration-VECM analysis
No full textOver the last few years there has been much debate about the hypothe- sis that anthropogenic emissions of CO2 and other greenhouse gases increase global temperature permanently. By using recent advances in time series econometrics, this paper tries to answer the question on how human activity affects Earth’s surface tem- peratures. Bearing in mind this goal, we estimated the long-run cointegration relations between global temperatures and changes in radiative forcings by a set of perturbing factors. We found that the temperature response to a doubling in radiative forcing of anthropogenic greenhouse gases is +2.94 °C [95% CI : +1.91, + 3.97], in perfect accordance with prior research), and that the orthogonalized cumulated effect over a 100 year time period, in response to a unit increase of size of one standard de- viation in greenhouse gas radiative forcing, is +3.86 °C [95% CI : +0.03, + 6.54]. Conversely, the amplitude of solar irradiance variability is hardly sufficient to explain observed variations in the Earth’s climate. Our results show that the combined effect of stochastic trends attributable to anthropogenic radiative forcing variations are driving the Earth’s climate system toward an ongoing phase of global warming, and that such long-run movement is unlikely to be transient
Anthropogenic CO2 Emissions and Global Warming: Evidences from Granger Causality Analysis
No full textThis note reports an updated analysis of global climate change and its relationship with Carbon Dioxide (CO2) emissions: advanced methods rooted in econometrics are applied to bivariate climatic time series. We found a strong evidence for the absence of Granger causality from CO2 emissions to global surface temperature: we can conclude that our findings point out that the hypothesis of anthropogenically-induced climate change still need a conclusive confirmation using the most appropriate methods for data analysis
Influenza della qualità della materia prima sul contenuto in PUFA di salsicce stagionate
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