利用空化射流技术开展了稠油降黏的实验研究。根据实验条件设计研造了空化射流稠油降黏实验系统,并利用该实验系统研究了两种空化喷嘴及空化射流处理次数等参数对稠油降黏效果的影响,分析了稠油在空化射流处理前后黏度发生的变化。结果...利用空化射流技术开展了稠油降黏的实验研究。根据实验条件设计研造了空化射流稠油降黏实验系统,并利用该实验系统研究了两种空化喷嘴及空化射流处理次数等参数对稠油降黏效果的影响,分析了稠油在空化射流处理前后黏度发生的变化。结果表明:两种空化喷嘴对稠油的降黏都有一定的作用,稠油黏度随着空化射流处理次数的增加逐渐降低,通过角形和风琴管喷嘴空化处理后,稠油黏度最大降低52 m Pa·s和88 m Pa·s,降黏率分别为13. 33%和18. 49%。实验验证了空化射流技术一定程度上可以改变稠油的性质,实现稠油的降黏,改善稠油的品质,合理运用可成为一种稠油降黏的新方法。展开更多
Neuropeptide Y (NPY) is one of the most important orexigenic agents in central regulation of feeding behavior, body weight and energy homeostasis in domestic chickens. To examine differences in the hypothalamic NPY be...Neuropeptide Y (NPY) is one of the most important orexigenic agents in central regulation of feeding behavior, body weight and energy homeostasis in domestic chickens. To examine differences in the hypothalamic NPY between layer-type and meat-type of chickens, which are two divergent kinds of the domestic chickens in feeding behavior and body weight, we detected mRNA levels of NPY in hypothalamic infundibular nucleus (IN), paraventricular nucleus (PVN) and lateral hypothalamic area (LHA) of these two types of chickens using one-step real time RT-PCR. The meat-type chicken had more food daily (about 1.7 folds) and greater body weights (about 1.5 folds) and brain weights than the layer-type chicken at the age of 14 d. In the meat-type of chicken, NPY mRNA levels of the IN and PVN were significantly greater than those of the LHA, and were not significantly different between the IN and PVN. However, in the layer-type of chicken, NPY mRNA levels were significantly greater in the IN than those in the LHA and PVN, and were not significantly different between the PVN and LHA. In all these hypothalamic regions, the layer-type of chicken had significantly higher NPY mRNA levels than the meat-type chicken did. These results suggest the expression of NPY in the hypothalamus has a type-dependent pattern in domestic chickens.展开更多
文摘利用空化射流技术开展了稠油降黏的实验研究。根据实验条件设计研造了空化射流稠油降黏实验系统,并利用该实验系统研究了两种空化喷嘴及空化射流处理次数等参数对稠油降黏效果的影响,分析了稠油在空化射流处理前后黏度发生的变化。结果表明:两种空化喷嘴对稠油的降黏都有一定的作用,稠油黏度随着空化射流处理次数的增加逐渐降低,通过角形和风琴管喷嘴空化处理后,稠油黏度最大降低52 m Pa·s和88 m Pa·s,降黏率分别为13. 33%和18. 49%。实验验证了空化射流技术一定程度上可以改变稠油的性质,实现稠油的降黏,改善稠油的品质,合理运用可成为一种稠油降黏的新方法。
基金Project supported by the Natural Science Foundation of ZhejiangProvince (No. Y306220)the Scientific Research Startup Fund ofZhejiang Academy of Agricultural Sciences, China
文摘Neuropeptide Y (NPY) is one of the most important orexigenic agents in central regulation of feeding behavior, body weight and energy homeostasis in domestic chickens. To examine differences in the hypothalamic NPY between layer-type and meat-type of chickens, which are two divergent kinds of the domestic chickens in feeding behavior and body weight, we detected mRNA levels of NPY in hypothalamic infundibular nucleus (IN), paraventricular nucleus (PVN) and lateral hypothalamic area (LHA) of these two types of chickens using one-step real time RT-PCR. The meat-type chicken had more food daily (about 1.7 folds) and greater body weights (about 1.5 folds) and brain weights than the layer-type chicken at the age of 14 d. In the meat-type of chicken, NPY mRNA levels of the IN and PVN were significantly greater than those of the LHA, and were not significantly different between the IN and PVN. However, in the layer-type of chicken, NPY mRNA levels were significantly greater in the IN than those in the LHA and PVN, and were not significantly different between the PVN and LHA. In all these hypothalamic regions, the layer-type of chicken had significantly higher NPY mRNA levels than the meat-type chicken did. These results suggest the expression of NPY in the hypothalamus has a type-dependent pattern in domestic chickens.
