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灾变时井下大气性状突变分析 被引量:1
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作者 钟茂华 温丽敏 +1 位作者 陈宝智 陈全 《中国有色金属学报》 EI CAS CSCD 北大核心 1998年第4期729-733,共5页
应用突变理论对火灾灾变时井下大气性状的变化过程进行了研究,建立了灾变过程大气性状的突变模型。该模型的分析结果与实际情况一致,利用这一突变模型可确定防治火灾的各种有效措施,确保矿山安全生产得以顺利进行。
关键词 矿井 火灾 大气性状 突变分析
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火灾灾变时井下大气性状突变分析
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作者 乔双树 蔡峰 +1 位作者 张龙 安红喜 《煤炭技术》 CAS 2007年第9期79-81,共3页
应用突变理论对火灾灾变时井下大气性状的变化过程进行了研究,建立了灾变过程大气性状的突变模型。该模型的分析结果与实际情况一致,利用这一突变模型可以确定防治火灾的各种有效措施,确保矿山安全生产得以顺利进行。
关键词 矿井火灾 大气性状 突变分析
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Economic and Qualitative Traits of Italian Alps Saffron 被引量:1
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作者 Alessandra MANZO Sara PANSERI +1 位作者 Danilo BERTONI Annamaria GIORGI 《Journal of Mountain Science》 SCIE CSCD 2015年第6期1542-1550,共9页
Saffron, obtained from the flower stigmas of Crocus sativus L., is one of the most expensive food spices. The introduction of saffron in alpine areas could help to broaden and diversify the activities of mountain mult... Saffron, obtained from the flower stigmas of Crocus sativus L., is one of the most expensive food spices. The introduction of saffron in alpine areas could help to broaden and diversify the activities of mountain multifunctional farms, with a positive impact on economy and land management. According to ISO 3632(2010/2011), saffron can be classified into three categories of quality(I, II, III) depending on the concentration of the three main metabolites responsible for its characteristic colour, flavor and aroma: Crocin, Picrocrocin and Safranal. This study represents the first investigation of the quality of saffron produced in the Italian Alps evaluated with spectrophotometry, HPLC, solid-phase microextraction(SPME), and gas chromatographic analysis combined with mass spectrometry(GC/MS). The experiments used Crocus sativus stigmas produced in 2012-2013 in different areas of the Central Italian Alps were located at an altitude between 720 and 1200 m a.s.l.. Results obtained were compared to commercial saffron. The analyses confirmed that all samples can be classified in the first quality category according to the ISO classification. This high quality is also confirmed by HPLC analysis. Moreover, the SPME-GC/MS analysis identified some differences in the aromatic profile of saffron samples, in particular regarding safranal concentration. A preliminary assessment of the economic viability of high quality saffron production for local markets was also performed. Our study provides valid information regarding the quality and economic sustainability of saffron production in the alpine area confirming this crop as a good candidate for a new source of income for multifunctional farms in mountain areas. 展开更多
关键词 Crocus sativus L. Alps ISO 3632 UV– Vis spectrophotometry SPME-GC/MS HPLC
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Estimation of atmospheric predictability for multivariable system using information theory in nonlinear error growth dynamics 被引量:1
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作者 LI AiBing ZHANG LiFeng WANG QiuLiang 《Science China Earth Sciences》 SCIE EI CAS 2014年第8期1907-1918,共12页
To estimate atmospheric predictability for multivariable system, based on information theory in nonlinear error growth dynamics, a quantitative method is introduced in this paper using multivariable joint predictabili... To estimate atmospheric predictability for multivariable system, based on information theory in nonlinear error growth dynamics, a quantitative method is introduced in this paper using multivariable joint predictability limit(MJPL) and corresponding single variable predictability limit(SVPL). The predictability limit, obtained from the evolutions of nonlinear error entropy and climatological state entropy, is not only used to measure the predictability of dynamical system with the constant climatological state entropy, but also appropriate to the case of climatological state entropy changed with time. With the help of daily NCEP-NCAR reanalysis data, by using a method of local dynamical analog, the nonlinear error entropy, climatological state entropy, and predictability limit are obtained, and the SVPLs and MJPL of the winter 500-hPa temperature field, zonal wind field and meridional wind field are also investigated. The results show that atmospheric predictability is well associated with the analytical variable. For single variable predictability, there exists a big difference for the three variables, with the higher predictability found for the temperature field and zonal wind field and the lower predictability for the meridional wind field. As seen from their spatial distributions, the SVPLs of the three variables appear to have a property of zonal distribution, especially for the meridional wind field, which has three zonal belts with low predictability and four zonal belts with high predictability. For multivariable joint predictability, the MJPL of multivariable system with the three variables is not a simple mean or linear combination of its SVPLs. It presents an obvious regional difference characteristic. Different regions have different results. In some regions, the MJPL is among its SVPLs. However, in other regions, the MJPL is less than its all SVPLs. 展开更多
关键词 nonlinear error ENTROPY MULTIVARIABLE predictability limit
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