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This paper introduces a flexible skewed link function for modeling ordinal response data with covariates based on the generalized
extreme value (GEV) distribution. Commonly used probit, logit and complementary log-log links are prone to link misspecification
because of their fixed skewness. The GEV link is flexible in fitting the skewness in the response curve with a free shape
parameter. Using Bayesian methodology, it automatically detects the skewness in the response curve along with the model fitting.
The flexibility of the proposed model is illustrated by its application to an ecological survey data about the coverage of
Berberis thunbergii in New England. We employ the latent variable approach by Albert and Chib (J Am Stat Assoc 88:669–679, (1993) to develop
computational schemes. For model selection, we employ the Deviance Information Criterion (DIC). 相似文献
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贵州浓香型白酒大曲中霉菌的18S rDNA系统发育分析 总被引:4,自引:0,他引:4
从贵州某名酒厂大曲中分离到104株丝状真菌(霉菌),通过形态特征和生理特性检测等传统鉴定方法,初步把形态和生理生化特征一致的霉菌归类为14个大类群;并采用18S rDNA序列分析,进一步把菌株归类为MJ-I至MJ-V五个类群,随后构建系统发育树.结果表明,样品中的霉菌以曲霉属(Aspergillus)为主,占总分离菌数... 相似文献
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Copper and zinc interaction on clearance from water and distribution in different tissues was investigated for the freshwater mussel, Cristaria plicata, under laboratory conditions. Clearance rate of Cu or Zn from water was highly dependent on exposure concentration. Interaction effect was most evident at 300 ??g??L?1 Cu exposure and depressed the Zn clearance rate significantly (p<0.05). However, the presence of 100 ??g??L?1 and 300 ??g??L?1 Zn hardly affected the Cu clearance rate. The 300 ??g??L?1 Cu presence enhanced Cu accumulation in each tissue most significantly (p<0.01), but caused Zn content to decrease in the gills by 62% (p<0.05), viscera by 49% (p<0.05) and foot by 31% (p<0.05), and increase in the mantle by 97% (p<0.05) and the muscles by 243% (p<0.05) for different Zn exposure treatments. The response of metal accumulation in various tissues of the test mussels indicated that Zn transferred from the gills, viscera and foot to the mantle and muscles might be one of the important characteristics of the Zn regulatory mechanism by leading to a narrow range of Zn concentration in the different tissues. 相似文献
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Keivan Nemati Nor Kartini Abu Bakar Mhd Radzi Bin Abas Elham Sobhanzadeh Kah Hin Low 《Environmental monitoring and assessment》2011,176(1-4):313-320
A study was carried out to investigate the fractionation of Cd, Cr, Cu, Fe, Mn, Pb, and Zn in shrimp aquaculture sludge from Selangor, Malaysia, using original (unmodified) and modified four-steps BCR (European Community Bureau of Reference, now known as the Standards Measurements and Testing Program) sequential extraction scheme. Step 2 of the unmodified BCR procedure (subsequently called Method A) involves treatment with 0.1 M hydroxylammonium chloride at pH 2, whereas 0.5 M hydroxylammonium chloride at pH 1.5 was used in the modified BCR procedure (subsequently called Method B). Metal analyses were carried out by flame atomic absorption spectrometry. A pseudo-total aqua-regia digest of BCR CRM 701 has also been undertaken for quality assurance purposes. The recovery of Method A for all metals studied ranges from 96.14% to 105.26%, while the recovery for Method B ranges from 95.94% to 122.40%. Our results reveal that Method A underestimated the proportion of metals bound to the easily reducible fraction except for copper. Therefore, the potential mobility of these elements is higher than others. Thus, to use this sludge as a fertilizer we have to first find a remediation for reduction of heavy metal contamination. 相似文献
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危险品泄漏事故后动态路网应急疏散研究 总被引:4,自引:3,他引:1
在建立以最短车辆总疏散时间为目标的应急车辆疏散模型过程中,考虑路网上的车流是时变的,以动态交通流分配理论对应急车辆流进行优化分配。基于计算的复杂性和粒子群算法(PSO)的优点,采用PSO对模型进行求解。算例试验结果表明,优化后的方案能够减轻整个疏散车辆的拥堵程度,为应急管理部门决策提供理论支持。 相似文献
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