激光复合强化提高球铁耐磨性能的实验研究   总被引：1，自引：1，他引：1  

花银群  杨继昌  张永康  陈瑞芳  符永宏 《农业机械学报》2004,35(1):147-149

将激光淬火处理后的QT800—2强化区域再进行激光冲击强化处理，并对其表面硬度和耐磨性进行了对比性实验和理论分析。实验结果表明：激光淬火冲击复合强化处理后QT800—2的硬度比纯激光淬火处理的硬度增加了18％；其耐磨性分别比软氮化和纯激光淬火处理区域的耐磨性大约提高了3倍和1倍。  相似文献   

如何根据季节变换做好猪场管理     

张永康  翟金龙  陈西风 《山东畜牧兽医》2012,(8):20-21

随着现代化养猪模式的日趋完善以及科学技术的突飞猛进,催生了猪场管理的一些新理念,其中通过精细化管理提高猪场各项生产指标,力争效益最大化,是养猪者不懈的追求。  相似文献   

Effects of Compound Bacteria Preparation on Fermentation Quality and Rumen Fermentation Characteristics of Phragmites australis Silage北大核心CSCD     

黄棋  汪水平  黄桥深  刘勇  杨鑫  张永康  李茂春 《动物营养学报》2023,(4):2443-2454

The purpose of this study was to investigate the effects of compound bacteria preparation (including homogeneous Lactobacillus/heterogeneous Lactobacillus, Bacillus subtilis and Aspergillus niger as well as their compatibility) on nutrient composition, fermentation quality and rumen fermentation characteristics of Phragmites australis silage. Taking growing Phragmites australis from Dongting lake as silage material, five groups were set up, which were blank group (CK group), lactic acid bacteria group (LA group, supplemented with Lactobacillus plantarum, Pediococcus pentosaceus and Lactobacillus buchneri), lactic acid bacteria+Bacillus subtilis group (LA+BS group), lactic acid bacteria+Aspergillus niger group (LA+AN group) and lactic acid bacteria+Bacillus subtilis+Aspergillus niger group (LA+BS+AN group), and each group had 3 replicates. The supplemental level of lactic acid bacteria was 1.5×108 CFU/kg silage raw materials, and the supplemental levels of Aspergillus niger and Bacillus subtilis were 1.0×108 CFU/kg silage raw materials (all were based on fresh weight of silage raw materials). After 60 days of silage, the nutrient composition and fermentation quality of Phragmites australis silage were determined, and the rumen fermentation characteristics were evaluated by in vitro fermentation and in vivo degradation. The results showed as follows: 1) the contents of dry matter and ash in LA, LA+BS and LA+AN groups were significantly lower than those in CK group (P<0.05), and the crude protein content in LA+BS, LA+AN and LA+BS+AN groups was significantly higher than that in CK and LA groups (P<0.05). 2) The silage sensory evaluation scores of all groups were 60 to 70 points, and the ratings were good. The comprehensive scores of fermentation quality in LA+BS and LA+AN groups were higher, among which, the ammonia nitrogen to total nitrogen ratio, acetic acid content and acetic acid to total acid ratio in LA+AN group were significantly decreased compared with CK group (P<0.05), while the lactic acid content and lactic acid to total acid ratio were significantly increased compared with CK group (P<0.05). 3) The dry matter disappearance rate and total gas production of in vitro fermentation in LA+AN group were significantly higher than those in the other groups (P<0.05), and in vitro fermentation parameters such as volatile fatty acid contents in fermentation liquid were improved. 4) The rumen fermentation dry matter degradation rate in LA+AN and LA+BS+AN groups at 8, 24 and 48 h was significantly higher than that in the other three groups (P<0.05). In conclusion, the combined application of lactic acid bacteria and Aspergillus niger with supplemental levels in this experiment has the best effect on the quality of Phragmites australis silage and rumen fermentation characteristics. © The Author(s) 2023.  相似文献   

地梢瓜的研究进展     

杨刚  张永康 《山东畜牧兽医》2020,41(12)

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酶法辅助提取湘西椪柑皮精油的工艺优化研究     

欧阳辉  余佶  张永康 《西北林学院学报》2010,25(6):152-154

以湘西椪柑皮为原料,采用酶法辅助提取精油,研究酶用量、提取温度、提取时间和pH4个因素对精油提取率的影响。通过正交试验,得到椪柑皮精油提取最佳工艺条件为:酶用量250 U·g~(-1),提取温度55℃,提取时间90 min,pH4.5。在此工艺条件下,椪柑皮精油提取率为1.63%。  相似文献   

超临界二氧化碳萃取杜仲果实中桃叶珊瑚苷工艺研究   总被引：1，自引：2，他引：1  

张永康  胡江宇  李辉  欧阳辉  银永忠 《林产化学与工业》2006,26(4):113-116

采用超临界CO2流体萃取技术选择适合的夹带剂,进行了从杜仲果实中提取桃叶珊瑚苷的工艺研究.运用L16(45)正交表,较系统地探讨了各因素对提取效果的影响,提取液以Epstahl试剂显色用分光光度法进行分析.研究表明:与传统的溶剂提取法相比,超临界CO2萃取法具有操作简单、活性成分保存好、后续分离易于进行等特点;在萃取中以75 %的乙醇为夹带剂,当萃取压力26 MPa、萃取温度55 ℃、分离温度30 ℃、萃取时间120 min、夹带剂用量与原料比6∶1(mL∶g)的条件下,效果最佳,桃叶珊蝴苷得率1.921 %.  相似文献   

牛心朴子生物碱的镇痛抗炎作用试验   总被引：10，自引：0，他引：10  

张永康  何生虎  李勇 《动物医学进展》2006,27(11):99-100

用热板法研究不同浓度的牛心朴子总碱对小鼠的镇痛作用,结果表明,50mg／kg体重的总碱对热板法所致小鼠的疼痛反应具有明显的抑制作用;以小鼠为实验动物,选用不同浓度的牛心朴子生物碱注射剂对其抗炎作用进行了研究。结果表明,牛心朴子生物碱的最小浓度在1．0mg／mL时,对二甲苯致小鼠的耳壳肿胀有明显的抑制作用,作用与浓度呈正相关。  相似文献   

牛心朴子化学成分预试验研究     

张永康  李生虎  杨刚 《中兽医医药杂志》2018,(3)

目的:初步确定牛心朴子中的化学成分。方法:采用试管预试法,根据要检测成分的具体情况选择水提取液、酸性乙醇提取液或甲醇提取液进行试验。结果:牛心朴子的酚性成分反应、生物碱、挥发油反应呈明显阳性,鞣质反应、甾体、萜类反应、强心苷反应和蒽醌及其苷反应也均呈现阳性。结论:牛心朴子中以生物碱和挥发油成分为主,还含有酚、黄酮、甾体、萜类等物质。  相似文献   

硒对不同品种杏鲍菇生理特性的影响     

李红侠  方雪梅  钱玉梅  徐礼生  张永康 《食用菌》2018,(2)

以不同品种杏鲍菇为试材,研究在培养料中添加不同浓度的亚硒酸钠,培养富硒杏鲍菇。通过对杏鲍菇子实体中硒含量、各种生理特性指标的测定。分析不同品种的杏鲍菇对硒的富集能力,硒对杏鲍菇子实体的过氧化氢酶、超氧化物歧化酶、谷胱甘肽过氧化物酶的活性影响。结果:对硒的富集能力不同品种间存在差异。培养料中亚硒酸钠含量在50~100mg/kg时,易于子实体中硒的富集,各种酶的活性增强,当亚硒酸钠含量在150~200mg/kg时,MDA(丙二醛)含量高于对照。结论:适宜的硒含量易于杏鲍菇硒的富集及生理特性的改善。  相似文献   

数控技术在自动化机械制造中的运用     

张永康 《湖北农机化》2019,(20)

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