抽象凸空间中抉择定理的推广

空间的凸性是不动点理论以及连续选择理论中的关键条件.本文对抽象凸结构的性质做了进一步的研究.讨论了抽象凸空间中的KKM方法,并应用KKM 方法给出了抽象凸空间中的"抉择定理".主要结果改进和推广了相关文献中的结果.     

L-fuzzy拓扑空间中的几乎可数层仿紧性

仿紧性是模糊拓扑学中的重要概念.在可数层仿紧性的基础上,介绍了几乎可数层仿紧性,并刻画了其基本特征.研究了L-fuzzy拓扑空间中几乎可数层仿紧性的性质.对闭子集遗传,与几乎可数强F紧集的乘积是几乎可数层仿紧集,是"L-好的推广",具有LF拓扑不变性.     

向量优化问题的Benson真有效解的充分与必要条件

在广义凸条件下，研究了带控制参量的向量优化问题。给出了这个问题的向量Lagrangians函数的概念，获得了Benson真有效解的充分条件与必要条件。     

荧光消除剂及其在造纸中的应用

随着人们健康和环保意识的不断提高,无荧光和食品级纸质包装材料越来越受到青睐。当造纸车间需要严格控制荧光物时,需要投入大量的精力对整个流程彻底串洗,此时可以使用荧光消除剂来消除各罐体、管道表面的荧光物来减少洗车时间,提高生产效率。     

新型纤维在开发应用中存在的问题

文章指出了环保性、功能性等新型纤维在应用开发过程中存在的一些问题,包括新型纤维的分类命名、鉴别问题、功能性纤维开发及评价、新型纤维的使用及其产业化等问题,同时对每个问题做了深入地分析探讨,并提出一些解决方案,对新型纤维的发展与应用有一定的促进作用.     

Genetic parameters and responses of linear type,yield traits,and somatic cell scores to divergent selection for predicted transmitting ability for type in Holsteins

The objective was to examine the direct and correlated responses of linear type, yield traits, and somatic cell scores (SCS) to divergent selection for predicted transmitting ability for type (PTAT) in Holsteins, while maintaining selection for yield traits across lines. For four generations, one-half of the University of Nebraska research Holstein herd was bred to Holstein sires with PTAT > 1.50 and the other half to sires with PTAT < 1.25, with nearly equal predicted transmitting abilities for yield traits for both groups. Estimates of genetic and residual correlations and heritabilities were obtained from REML estimates of (co)variance components. Model for type traits included fixed effect of date cows were classified, effects of age in days at freshening, and stage of lactation at classification. Year-season when cows freshened was fixed effect in model for yield and SCS. Animal genetic and residual effects were random. Final score, milk, fat, and protein yields, and SCS had heritability estimates of 0.38, 0.13,0.22, 0.09, and 0.38, respectively. Heritability estimates for type traits ranged from 0.04 to 0.52. Estimates of genetic correlations of final score with SCS and milk, fat, and protein yields were -0.64, 0.01, -0.18, and 0.06, respectively. Estimates of genetic correlations among linear type traits ranged from -0.77 to 1.00. Means of estimated breeding values for final score, stature, strength, body depth, fore udder attachment, rear udder height and width, udder cleft, udder depth, and front teat placement were significantly different between lines in the third generation. Milk, fat, and protein yields were not significantly different between lines in third generation, whereas SCS was significantly different. Estimate of genetic correlation between final score and SCS suggest that selection on PTAT would result in a change for SCS. In this study, divergent selection on PTAT of sires had a significant effect on udder and body traits, but little or no effect on feet and leg traits.     

Genetic parameters for yield,fitness, and type traits in US Brown Swiss dairy cattle

The objective of this research was to evaluate heritabilities and genetic correlations among yield, fitness, and type traits for US Brown Swiss cattle born in 2000 and later. The data set used consisted of 108,633 first through fifth lactation records from 45,464 cows for yield, somatic cell score (SCS), days open, and productive life. Approximately half of the records had observations for 17 type traits and 41,074 had observations for milking speed. These data were analyzed using a series of 3 trait models. Heritability estimates of each trait were similar to previously reported values for both Holsteins, and Brown Swiss in other countries. Milk, fat, and protein yield had strong positive genetic correlations with productive life (0.67 to 0.71), whereas days open and SCS had strong negative correlations with productive life (?0.60 and ?0.69, respectively). Days open was more unfavorably correlated with dairy form (angularity) than with yield. The genetic correlation of udder depth and milk yield was unfavorable (?0.40), whereas rear udder height (0.20) and width (0.48) were favorably correlated with milk yield. Udder depth had a favorable genetic correlation with SCS (?0.26). Type traits with the strongest genetic correlations with productive life were fore udder attachment, mobility, and final score (0.44, 0.50, and 0.57, respectively). These updated genetic parameters will allow for improved genetic selection within the Brown Swiss breed.     

我国造纸行业环境保护类型区划分及环境政策建议

基于造纸行业现有分区,结合其原料结构和制约因素,将我国划分为8个环境保护类型区,并提出分区环境政策建议,旨在帮助和强化造纸行业环境管理,改善区域环境质量。     

浓香型产区烤烟香韵与香气质量及香型关系研究

为明确浓香型烟叶风格特征与品质特征之间的联系,以8个浓香型产区2011—2012年的264份烟叶样品为材料,运用灰色关联度分析、偏相关分析和逐步回归分析等方法分析了感官评价中的香韵指标（焦甜香、焦香、正甜香、干草香、木香、坚果香、辛香）与烟叶香气质量及香型之间的关系。结果表明：（1）香韵对香气质影响以焦甜香、干草香为最大;香韵对香气量影响以干草香、焦甜香为最大;香韵对香型影响以焦甜香、正甜香为最大。（2）干草香与香气质呈显著正相关,焦甜香与香气质呈显著负相关;干草香与香气量呈显著正相关;正甜香与香型呈显著正相关,焦甜香与香型呈极显著正相关。（3）通过逐步回归模型,建立了香韵各指标与香气质量及香型的最优回归方程,可以利用回归方程来预测香气质量及香型。     

乳源性金黄色葡萄球菌肠毒素的检测与基因分型

通过检验各类乳制品收集了大量乳源性金葡菌菌株,应用酶联荧光免疫分析法对菌株的肠毒素进行检测分析,并进一步使用荧光定量PCR法对肠毒素基因进行分型.结果表明,乳源性金葡菌肠毒素的检出率与基因型分布均呈现一定显著特征,应用酶联荧光免疫分析法与荧光定量PCR法对肠毒素的检测结果总体无显著性差异.