接装纸透气度和滤棒吸阻对卷烟烟气细胞毒性的影响

采用中性红细胞毒性试验测试了不同透气度接装纸卷烟和不同吸阻滤棒卷烟烟气冷凝物的细胞毒性,并初步分析了卷烟烟气的细胞毒性指标与CO,NNK,NH3,HCN,B[a]P,巴豆醛和苯酚释放量之间的相关性.结果表明:①随着接装纸透气度的增大,卷烟烟气冷凝物的细胞毒性呈降低趋势;细胞毒性指标与CO,NNK,NH3,HCN,B[a]P,巴豆醛和苯酚的释放量之间具有一定的相关性;②随着滤棒吸阻的增大,卷烟烟气冷凝物的细胞毒性呈降低趋势;细胞毒性指标与NH3,HCN,B[a]P和苯酚的释放量之间具有一定的相关性.     

用于生产和提纯丙烯酸正丁酯的方法

一种制备丙烯酸正丁酯（BA）的方法，包括步骤：用正丁醇（n-BuOH）在反应区酯化丙烯酸（AA），由反应区的塔顶蒸气得到冷凝物，将其分成有机相和水相，将含有大部分BA和少部分BuOH、水和轻馏分杂质的有机相送入分馏区，由此得到高纯度BA侧流和含有BA、BuOH、水和轻馏分的塔顶冷凝物，将来自塔顶冷凝物的大部分再循环到反应区，将该冷凝物的剩余部分和补充的水相一起送入回收区，由回收区得到塔顶冷凝物，     

Statics characteristics of two Bose-Einstein condensate dark solitons trapped in an optical lattice

The statics characteristics of two coupled Bose-Einstein condensate （BEC） dark solitons trapped in an optical lattice are investigated with the variational approach. It is found that the interaction between a ‘kink＇ and an ‘anti-kink＇ with opposite phase gradients is effectively repulsive, and the optical lattice can be controllably used to produce a pair of static BEC dark solitons. Its effect depends on the initial location of the BEC dark solitons, the lattice amplitude and wave number.     

优化型联合法制取海绵钛过程中冷凝物分布对真空蒸馏过程的影响

通过对优化型联合法制取海绵铁生产过程进行考察并结合现场生产实际情况，从理论上分析了真空蒸馏冷凝物的生成机理，并用过程耦合的观点论述了真空蒸馏冷凝过程及冷凝物的组成和分布，在分析冷凝物结构对真空蒸馏过程影响的基础上，提出了较为合理的冷凝物冷凝分布，为改进和完善工艺设备和工艺制度提供参考。     

NNK和B[a]P在卷烟烟气复杂基质中的联合遗传毒性

为对卷烟进行安全性评价,以肯塔基参比卷烟3R4F为研究对象,以B[a]P、NNK为目标化合物,采用检测哺乳动物细胞致突变性的微核试验,结合三者对人体支气管上皮细胞的毒性作用,分析了B[a]P、NNK在卷烟烟气复杂基质中的联合作用.结果表明:(1)B[a]P、NNK与CSC均具有体外细胞遗传毒性;(2)两两联合作用诱发细胞微核存在一定的拮抗效应;(3)三者联合作用呈现一定的协同作用.     

Deliverability of wells in carbonate gas condensate reservoirs and the capillary number effect

With the development of the Tazhong No. 1 carbonate gas condensate reservoir in China, it has become more and more important to study the characteristics of gas condensate well deliverability. A single-well radial simulator for dual-permeability reservoirs was established to study the influences of fluid properties, permeability, and pressure drawdown on well deliverability with and without the capillary number effect. The simulation shows that well deliverability basically maintains its initial value and is not affected by the capillary number when the formation pressure is higher than dew-point pressure. However, well deliverability drops rapidly when the formation pressure is lower than dew-point pressure. Even if the condensate dropout is very low, well deliverability without the capillary number effect reduces to 50 percent of its initial value when reservoir pressure declines to 95 percent of dew-point pressure, but well deliverability is significantly improved if the capillary number effect exists. The capillary number effect is most significant when reservoir pressure is just lower than dew point pressure, then the effect decreases; the reduction of well deliverability is mainly caused by the reduction of gas relative permeability of the matrix system near the wellbore.     

啤酒汽酒过滤灌装中的重点

近年来由于工业的发展,经济的活跃,带来人民生活水平的提高,啤酒、汽酒类的低酒度饮料需求量急剧上升,产量也大幅度增加。但生产单位以小型的地方国营和集体单位多。在质量上由于设备差,而又没有较强的技术力量致使很多产品质量低劣。     

提高啤酒非生物稳定性的几点体会

1 前言 啤酒的稳定性是鉴定货架期啤酒质量的综合指标。它分为风味稳定、生物稳定、非生物稳定。其中非生物稳定也即胶体稳定是在理论上复杂,实践中问题较多的一类。 啤酒是一种胶体稳定性较差的溶液。保存过程中易产生沉淀物或失光。如果啤酒出现失光混浊或沉淀物,就会失去新鲜的美味感,这样就会影响消费者的购买欲望,使产