自抗扰控制器解决多变量系统的耦合问题的研究

为了解决传统的解耦PID协调控制的输出有超调、振荡等缺点,本文采用了自抗扰控制技术应用于多输入-多输出系统的解耦控制方法．重点介绍了自抗扰控制技术应用于多输入-多输出系统的原理和进行了MATLAB／SIMULINK的仿真．通过仿真实验表明：ADRC控制的具有较强跟随性,抗干扰性等特点,能够很好的解耦．     

古今“合同”知多少

合同是我们现代社会经常用到的一种文体。《现代汉语》中解:合同是两方面或几方面在办理某事时,为了确定各自的权利和义务而订立的共同遵守的条文。而通常我们遇到的是都是民事合同,它是当事人或当事双方之间设立、变更、终止民事关系的协议,广义合同则是指所有法律部门中确定权利、义务关系的协议。《中华人民共和国民法通则》第85条规定:依法成立的合同,是受到法律保护的。     

日粮添加"仔猪健"对仔猪生产性能和抗拉稀效果观察及分析

为探讨"仔猪健"对仔猪生产性能及抗拉稀效果的影响,试验选择35-40日龄杜长大/杜大长仔猪80头,随机分成实验组和对照组,每组40头,对照组用普通4%乳猪预混料配制基础日粮,试验组在对照组基础日粮的基础上另按1%比例添加"仔猪健",试验期28天.结果表明试验组仔猪在腹泻率、头均增重、头均日增重、料肉比等方面均优于对照组,经济效益明显.     

浅谈生物教学中如何培养学生创新能力

一、自信心是培养学生创新能力的“激素” 学生的自信心是学生进行创造性思维的动力源泉。在生物教学过程中,增强学生的自信心,可以提高学生在创新过程中的抗挫折能力,磨炼学生的创新意志。     

Inhibition of mitochondria responsible for the anti-apoptotic effects of melatonin during ischemia-reperfusion

Objective： To investigate a possible mechanism responsible for anti-apoptotic effects of melatonin and provide theoretical evidences for clinical therapy. Methods： lschemia-reperfusion mediated neuronal cell injury model was constructed in cerebellar granule neurons （CGNs） by deprivation of glucose, serum and oxygen in media. After ischemia, melatonin was added to the test groups to reach differential concentration during reperfusion. DNA fragmentation, mitochondrial transmembrane potential, mitochondrial cytochrome c release and caspase-3 activity were observed after subjecting cerebellar granule neurons to oxygen-glucose deprivation （OGD）. Results： The results showed that OGD induced typical cell apoptosis change, DNA ladder and apoptosis-related alterations in mitochondrial functions including depression of mitochondrial transmembrane potential （its maximal protection ratio was 73.26%） and release of cytochrome c （its maximal inhibition ratio was 42.52%） and the subsequent activation of caspase-3 （its maximal protection ratio was 59.32%） in cytoplasm. Melatonin reduced DNA damage and inhibited release of mitochondrial cytochrome c and activation of caspase-3. Melatonin can strongly prevent the OGD-induced loss of the mitochondria membrane potential. Conclusion： Our findings suggested that the direct inhibition of mitochondrial pathway might essentially contribute to its anti-apoptotic effects in neuronal ischemia-reperfiusion.     

Integrated application of some compatible biocontrol agents along with mustard oil seed cake and furadan on Meloidogyne incognita infecting tomato plants

INTRODUCTION Tomato (Lycopersicon esculentum, Mill.), an important vegetable crop is heavily attacked by root knot nematode, Meloidogyne spp. For the manage-ment of root knot nematodes although chemical nematicides were used till 1982, due to their high cost, toxic effect on beneficial soil borne microorganism and carcinogenic effect on human beings alternative approaches are practiced mainly through eco-friendly means like biological control agents, organic amendments, etc. (Singh and …     

抗疫事迹融入大学生生命教育的价值、原则、路径

新冠肺炎疫情暴发后所涌现出的抗疫事迹具有深刻的生命教育价值意蕴.高校教育工作者应坚持主体性、情感性、超越性原则,探索有效路径,将抗疫事迹全方位融入大学生生命教育,提升大学生生命教育的实效性,引导大学生尊重生命、珍惜生命,实现生命的价值意义.     

健康新知

抗高血压药或可减缓老年痴呆 美国西奈山医学院的研究人员发现,目前用于抗高血压的药物卡维诺尔可能减缓老年痴呆症的神经退变,并增强记忆功能。这一新的发现来自于两项研究,它们分别发表在本期的《衰老神经生物学》和《阿尔茨海默病杂志》上。     

减缩剂对泵送混凝土性能的影响

为了提高泵送混凝土的抗裂性,进行了减缩剂对泵送混凝土性能影响的试验研究,结果表明,泵送混凝土中掺加减缩剂,干缩率明显降低;掺量1.5％时,28d干缩率可降低40％以上,同时该减缩剂可明显改善新拌泵送混凝土的和易性,提高28d抗压强度,但抗折强度略有降低.     

盐酸左氧氟沙星凝胶剂的质量标准研究

本文对盐酸左氧氟沙星凝胶剂的质量标准进行研究。方法:采用YMC C18色谱柱(218 mm×4.6mm,5μm),0.05mo.l L-1枸橼酸溶液-乙腈(87:13)用三乙胺调节pH值至4.0,检测波长为293nm,流速为1.0ml/min,柱温为30℃。盐酸左氧氟沙星在24～120mg.mL-1范围内呈良好的线性关系(r=0.99996)。盐酸左氧氟沙星平均回收率分别为99.6%。结论:本法简便、准确,可用于盐酸左氧氟沙星凝胶剂的质量控制。