浅谈机械自动化技术在汽车控制中的应用

汽车控制领域中,机械自动化技术已被广泛地应用。这是由于机械自动化技术大大减少了汽车在制造中的成本,同时还使得生产质量得到了成倍的提高,生产效率也大大提升,由此可见机械自动化技术对于汽车行业的发展有着相当大的促进作用。文章叙述了在汽车控制中机械自动化技术的应用。     

豇豆新品种--丰产三号

丰产三号是广东省农科院蔬菜研究所选育的优良豇豆新品种,具有结荚力强,品质优,商品性好,适应性广,耐热性强,产量高等的特点.2000年起在广东省及全国各地试种示范,均表现优良,深受欢迎,适合在全国各地推广种植.     

淡水鲨鱼池塘养殖试验

我们在山东省利津县淡水名优品种养殖示范园内,利用土质池塘,进行了淡水鲨鱼的试养工作,取得了较好的效益,现将基本情况报告如下。     

新疆检验检疫局从进口牛中检出牛地方流行性白血病(EBL)

牛地方流行性白血病(enzootic bovine leukosis,EBL)是由反转录病毒属牛白血病病毒(BLV)在成年牛中引起的一种漫性、进行性、接触传染性肿瘤病.     

全面放开二孩政策下中国人口预测与分析--基于Leslie改进模型

在全面放开二孩政策下,依据2011-2015年分性别、分年龄的人口统计资料,建立了具有政策影响效果的双性别Leslie人口模型,对中国人口进行预测。结果表明:全国总人口将于2026年达到峰值14.264亿,随后快速下降;男女性别比失衡问题将得到有效缓解,男性和女性占总人口的比例将逐渐下降并在本世纪中叶趋于稳定,分别稳定在50.08%和49.92%;但全面二孩政策并不能从根本上解决人口老龄化问题,我国未来65岁及以上人口比重依然很大且总体上呈现逐年上升趋势。     

职业生涯各阶段员工忠诚度控制策略

处于知识经济时代的企业要获得长远的发展,必须牢牢依靠知识型员工。如何留住知识型员工,提高其忠诚度是每个企业都要面对的问题。文章在明确忠诚员工的经济意义上,对员工职业生涯阶段进行了划分,然后再具体阐述如何在职业生涯各阶段对员工忠诚度进行控制,以使企业获得稳定的员工队伍。     

扑虱灵防治广玉兰糠片蚧

扑虱灵防治广玉兰糠片蚧曹建曾晓华（湖南娄底市园林管理处４１７０００）广玉兰Ｍａｇｎｏｌｉａｇｒａｎｄｉｆｌｏｒａ属木兰科木兰属常绿乔木,原产北美洲东南部;我国长江流域各省区均有栽培。广玉兰树枝雄伟壮丽,叶厚有光泽,花大而芳香,为优良的城市园林绿化观赏...     

湿地松针叶束育苗试验

原产美国的湿地松(Pinus ellottii Engeim),经引种试验表明,具有生长快,适应性强,木材材质好,病虫害少等优良特性,因而成为我省丘陵区大有发展前途的造林树种。鉴于目前从国外进口种子数量有限,湖北荆州地区林科所于1973年开始进行湿地松针叶束育苗研究,1979年获     

Effects of Faba Bean Supplementation on Growth Performance,Intestinal Digestive Enzyme Activities,Intestinal Morphology and Intestinal Flora of Tilapia (Oreochromis niloticus)北大核心CSCD

This study was conducted to investigate the effects of faba bean supplementation on the growth performance, intestinal digestive enzyme activities, intestinal morphology and intestinal flora of tilapia (Oreochromis niloticus). A total of 600 genetic improvement of farmed tilapia with an initial body weight of (500.23± 0.34) g were randomly divided into 4 groups with 3 replicates per group and 50 fish per replicate. Four isonitrogenous and isolipidic experimental diets containing 0 (C0 group, as control), 15% (C15 group), 30% (C30 group) and 60% (C60 group) faba bean were fed to fish during the 100-d feeding trial. Results showed as follows: 1) there were no significant differences in the weight gain rate, specific growth rate, feed coefficient ratio and hepatosomatic index among the groups (P>0.05), the protein efficiency ratio and survival rate in C60 group were significantly higher than those in C0 and C15 groups (P<0.05). 2) There were no significant differences in the activities of amylase, lipase and trypsin among the groups (P>0.05). 3) Compared with the C0 group, the C15, C30 and C60 groups had significantly lower intestinal villus height, villus thickness and muscle thickness (P<0.05). 4) The Simpson index of intestinal flora of tilapia in C15, C30 and C60 groups was lower than that in C0 group, and the difference was significant between C30 and C0 groups (P< 0.05). 5) The intestinal core flora of the four groups of tilapia were mainly Cyanobacteria, Actinobacteriota, Firmicutes, Proteobacteria and Fusobacteriota. Compared with the C0 group, the relative abundance of Proteobacteria in C15, C30 and C60 groups had a significant reduction (P<0.05), and the relative abundances of Fusobacteriota and Cetobacterium in C15 and C60 groups had a significant reduction (P<0.05). To conclude, under the conditions of isonitrogenous and isolipidic, diets supplemented with 15% to 60% faba bean have no significant effects on the growth performance and intestinal digestive enzyme activities of tilapia, but can significantly reduce the intestinal villi height, villus width and muscle thickness, decrease the relative abundance of Proteobacteria and the diversity of intestinal flora. © 2023 Authors. All rights reserved.