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真伪卷烟由于工艺条件、原辅材料及配方的不同,烟气指标存在一定差异。本文用SM450直线型吸烟机测定了国内真、伪卷烟A的6项主流烟气指标,并用因子分析和聚类分析对测定结果进行分析比较。因子分析的结果表明3个因子累计贡献率已达95.681%(≥85%),且总方差的58%的贡献来自第1因子,所对应真伪卷烟主流烟气成分的特征指标为一氧化碳、总粒相物和焦油。利用特征指标对20个真、伪卷烟进行层次聚类分析的结果表明当样本划分为2类时,样本的类归属情况与卷烟的真伪属性完全符合,充分说明统计分析方法在卷烟真伪鉴别工作中是一个有效的工具。 相似文献
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为找到中支卷烟适宜的烟丝形态,以烟丝特征长度表征烟丝形态,采用烟丝形态调控技术,分析了中支卷烟烟丝不同特征长度与质量指标及稳定性关系。结果表明:①烟丝特征长度在2.35~2.85 mm(卷制前)范围内,中支卷烟物理指标稳定性较好; ②空头率、烟支密度标准偏差和密度分布一致性系数η值均随特征长度减小呈先降低后增大的趋势。③当烟丝特征长度在2.35~2.80 mm(卷制前)范围内,卷制烟支样品端部落丝量较小、燃烧锥落头倾向较低,但动态吸阻分布一致性存在波动。④综合分析,考虑到配方间差异,中支卷烟烟丝特征长度在2.35~2.85 mm(卷制前)范围内,辊筛频率在37~47 Hz之间,物理指标稳定性、烟支密度一致性较好,空头率和燃烧锥落头倾向较低,端部落丝量较小。 相似文献
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真伪卷烟由于工艺条件、原辅材料及配方的不同,烟气指标一定存在差异。本文用SM450直线型吸烟机测定了国内真、伪卷烟A的 6项主流烟气指标,并用因子分析和聚类分析对测定结果进行分析比较。因子分析的结果表明3个因子累计贡献率已达95.681%(≥85%),且总方差的58%的贡献来自第1因子,所对应真伪卷烟主流烟气成分的特征指标为一氧化碳、总粒相物和焦油。利用特征指标对20个真、伪卷烟进行层次聚类分析的结果表明当样本划分为2类时,样本的类归属情况与卷烟的真伪属性完全符合,充分说明统计分析方法在卷烟真伪鉴别工作中是一个有效的工具。 相似文献
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《烟草科技》八三年第二期刊登了唐占云同志的《论卷烟质量和考核指标及其考核》一文后,由于自己也是搞生产技术工作的,故也想谈些看法,与行家共同探讨. 我国卷烟工业的产品质量指标的设计,检查和考核,并在统计报表上反映,经过了三个阶段.一九六四年成立中国烟草公司期间,卷烟质量指标在统计报表上是以卷烟成品合格率来考核的,产品质量是以牌号类别 相似文献
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纺织产业集群的经济景气研究在国内处于起步阶段,本文依据产品价格调查方法、企业景气调查方法和企业财务数据构建了专业市场型产业集群经济景气的指标体系,该景气指标体系由产品综合价格指数、市场景气指数和企业现金流指数构成。这一体系在中国东方丝绸市场发布的丝绸化纤指数中得到了运用。 相似文献
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A new selection index percent emphasis method using subindex weights and genetic evaluation accuracy
The current international standard methodology to quantify trait percent emphasis in selection indexes is based on a simple multiplication of the relative contribution of each trait's economic value (converted to absolute value) and its genetic standard deviation. This method does not reflect the actual selection emphasis applied when the index is used in practice. The economic value does not reflect selection effort when traits differ considerably in their accuracy of evaluation, and no account is taken for either favorable or antagonistic correlations among traits. A new emphasis method adjusted by both accuracy and genetic correlation is proposed. Genetically highly correlated traits are grouped into subindexes by applying a hierarchical clustering method to the genetic correlation matrix. Then each trait's subindex emphasis is calculated within its subindex group, with a weighting included for trait accuracy. Finally, each subindex emphasis is converted to a full index emphasis according to the conventional relative emphasis of its corresponding subgroup. The method can also be applied to sets of breeding values and their economic weights. When applied to a New Zealand sheep breeding selection index where trait genetic correlations are distinct across subindex groups, the new method shrank the emphasis on low-heritability traits, including survival, from 51% to 19%; and expanded that on growth traits from 30% to 49%, better reflecting the selection pressure applied in reality. When genetic correlations across traits were similar, clustering became difficult. Accounting for accuracy affected traits' within-subindex group rankings, whereas the clustering to account for correlations affected all traits within a subgroup equally. Accounting for differences in trait accuracy when describing percent emphasis within selection indexes gives a more practical indication of the likely outcome of selecting on the index. Accounting for correlations among traits when defining percent emphasis made a significant difference only in a subset of case study examples. 相似文献
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本文从整体和分类两个层面分别计算了植物油籽1999-2008年的G-L产业内贸易指数、Brulhart边际产业内贸易指数、Thom&McDowell边际产业内贸易指数,发现我国植物油籽的整体产业内贸易水平非常低,Brulhart边际产业内贸易指数显示我国植物油籽10年来贸易的增量主要来自于产业间贸易,Thom&McDowell指数表明我国植物油籽产业内贸易主要由水平产业内贸易引发。文章认为应该加快科技兴农步伐,提升我国植物油籽的质量,实施产品差异化战略,促进植物油籽品种的多元化,并争取WTO的特别保障条款,减少进口大豆、油菜籽对我国大豆、油菜产业的冲击。 相似文献
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Isabelle Travers Alain Jacquet Adlaïde Brisset Claire Maite 《Journal of the science of food and agriculture》2002,82(9):983-989
Monitoring the hydrolysis or disappearance of starch by the starch iodine test is a simple procedure for determining the maturity of cider apples, but it does not indicate the exact amount of starch present. So far, studies of starch in apples have dealt exclusively with dessert apples. In this paper the relationship between the visual starch index, the dark‐coloured surface area and the real starch content was studied in two varieties of cider apple commonly used in Normandy (France). Starch determination in cider apples required adapting the protocol provided by the Boehringer enzymatic kit. The work led to proposing a simplified index with five scales instead of 10. This index gives the correspondences between the new and old scales as well as the probable starch contents for each new scale. © 2002 Society of Chemical Industry 相似文献