配料混合试验的设计和分析   总被引：2，自引：0，他引：2  

莫惠栋 《扬州大学学报(农业与生命科学版)》2004,25(1):1-4

系统地介绍了配料混合试验的基本概念．指出了混合试验与常规因子试验的区别。提出配料混合试验的3种设计，即顶点和边界点设计、矩心设计和极顶设计。以2个实例演示了混合试验资料的统计方法，包括回归和方差分析．驻点分析和等值线分析。  相似文献   

基于模糊建模的混炼胶粘度测量     

樊绍胜  王耀南 《湖南农业大学学报(自然科学版)》2004,31(3)

提出了一种在线测量混炼胶粘度的新方法．该方法以模糊建模技术为基础，综合考虑混炼过程各因素对胶料粘度的影响，建立起胶料粘度的在线测量模型．在模糊建模中，采用T-S模型描述胶料粘度变化的非线性过程，提出了一种基于相似性判别的模糊聚类算法以自动确定合适的聚类组数目，并用实数编码的遗传算法优化全局参数，从而获得了规则简化的、具有较高精度的模糊模型．根据此方法，设计了测量装置，并进行了现场试验．试验结果表明模糊模型输出与实验室测量值基本一致，平均误差较低且最大误差未超过1门尼．该方法较大地提高了橡胶混炼的生产效率，为粘度最优控制奠定了基础．  相似文献   

马尖相思人工混交林试验初报     

杨绍增  王瑞荣  王达明  苏俊武 《西部林业科学》1996,(2)

根据在普文试验林场开展的马尖相思与高阿丁枫，马尖相思与西南桦行状混交（面积６．８３ｈｍ￣２）试验，４、５年时的阶段效果，从混交林的林分结构，生长状况，林分的土壤主要理化性状及其年度变化情况方面，论述了两种混交林与纯林的差异，以及不同行状混交方式间的差异。  相似文献   

植物叶面铺展剂的复配规律Ⅰ.SDS和TX100混合水溶液体相及表面层相互作用行为     

赵剑曦  赵叔唏  李清禄  唐南琦 《福建农林大学学报(自然科学版)》1991,(4)

2种典型固体表面铺展剂SDS和TX100混合水溶液,无论在其表面层或在混合胶团中两组分之间均存在一定程度的相互作用,使得以廉价的SDS为主的溶液中加入少许TX100组成的复配体系表面活性提高,在植物叶面上的润湿性能改善,并从理论上计算了其相互作用参数,初步解释了实验现象,上述结果不仅对指导优良植物叶面铺展剂配方具有指导意义,也预示了潜在的实用价值.  相似文献   

施肥对黔中地区混播草地牧草生长性能的影响   总被引：2，自引：0，他引：2  

邓蓉  张定红  陈武  向清华 《畜牧与兽医》2004,36(3):12-15

本文研究了氮磷钾不同配比施肥量对黑麦草和紫花苜蓿混播草地牧草生长的影响,结果表明:氮肥促进禾本科牧草叶的生长(P<0.05),增施钾肥对禾草的生长有利;磷能促进豆科牧草根的生长(P<0.05)且豆科牧草株高随着施磷量的增加各处理间差异显著(P<0.05),高氮抑制豆科牧草的生长;最高产量的施肥方式:N:P_2O_5:K_2O为20:30:20,比对照处理的草地产量增加63.92％。  相似文献   

Effects of Jiedu-Qingfei mixture on NF-κB and p38 MAPK pathways in lung tissues of rats with Mycoplasma pneumoniae infection     

YAN Chun-xia  HE Guo-chan  WEN Ren-qing  ZHANG Yan-fang 《园艺学报》2019,35(5):926-932

AIM: To observe the therapeutic effect of Jiedu-Qingfei mixture on Mycoplasma pneumoniae (MP)-infected rat lung tissues and to explore its mechanism. METHODS: SD rats (n=40) were randomly divided into 4 groups:blank control group, model group, Jiedu-Qingfei group and positive control group, with 10 rats in each group. The rats in experimental groups were slowly dripped with 1×10⁹ CFU/L MP solution into their nostrils for 4 d. One rat in each group was sacrificed for MP nucleic acid detection at the second day after inoculation, and the other rats were given gavage therapy. The rats in blank control group and model group were intragastrically given the same volume of normal saline, the rats in Jiedu-Qingfei group were given 8 mL/kg Jiedu-Qingfei mixture daily for 4 weeks, and the rats in psoitive control group were given dexmethasone sodium phosphate (0.5 mg·kg^-1·d^-1). After the experiment, the rats were killed. The serum and bronchoalveolar lavage fluid (BALF) were collected for detecting the levels of interleukin-12 (IL-12), IL-13 and TNF-α by ELISA. The right lung tissues were used for pathological observation and HE staining, while the left lung tissues were used to detect the expression of NF-κB p50, I-κBα and p38 mitogen-activated protein kinase (p38 MAPK) at mRNA and protein levels. RESULTS: The results of MP nucleic acid detection showed that all the rats except blank control group were MP nucleic acid positive, indicating that the rat model of MP infection was successfully established. On the 1st day of the treatment, the pathological scores of the lung tissues in model group and Jiedu-Qingfei group were significantly higher than those in blank control group (P<0.05). After treatment, the pathological scores of the lung tissues in mo-del group were significantly higher than those in blank control group and Jiedu-Qingfei group. The levels of IL-12 in the serum and BALF in model group were significantly lower than those in blank control group after MP infection (P<0.05), while those after treatment with Jiedu-Qingfei mixture were significantly higher than those in model group (P<0.05). The levels of IL-13 and TNF-α in the serum and BALF of MP-infected rats were increased significantly, while those after treatment with Jiedu-Qingfei mixture were significantly lower than those in model group (P<0.05). The mRNA expression levels of NF-κB p50 and p38 MAPK in model group were increased significantly (P<0.01). After treatment, the mRNA expression levels of NF-κB p50 and p38 MAPK were decreased significantly compared with model group (P<0.01). The mRNA expression level of I-κBα in model group was significantly lower than that in control group. After treatment, the mRNA expression of I-κBα in Jiedu-Qingfei group was significantly higher than that in model group (P<0.05). The protein levels of NF-κB p50 and p38 MAPK in the lung tissues of model group were significantly higher than those of blank control group. After treatment, the protein expression of NF-κB p50 and p38 MAPK was decreased significantly. The protein level of I-κBα in model group was significantly lower than that in blank control group, and after treatment with Jiedu-Qingfei mixture, the protein expression level of I-κBα was increased significantly (P<0.05). CONCLUSION: Jiedu-Qingfei mixture may attenuate lung tissue inflammation caused by MP through NF-κB and p38 MAPK pathways.  相似文献   

宁夏绿洲禾豆牧草混播组合及其比例效应   总被引：1，自引：0，他引：1  

祁亚淑  朱林  许兴 《草业科学》2015,(9):1463-1472

在宁夏中部半干旱带有补灌的条件下,以紫花苜蓿(Medicago sativa)、沙打旺(Astragalus adsurgens)、羊草(Leymus chinensis)和老芒麦(Elymus sibiricus)为试验材料,豆科与禾本科牧草分别按照3∶7、5∶5、7∶3共3种不同比例进行混播,研究了不同混播组合及比例对其经济投入产出比、干草及主要营养成分产量、相对总产量及竞争力等方面的影响。两年的试验结果表明,3种豆禾牧草混播比例的产量均显著大于单播禾本科牧草的产量(P0.05)。苜蓿与禾本科牧草混播组合2013年及2014年的产量均显著高于沙打旺与禾本科牧草的混播组合(P0.05),其中,紫花苜蓿∶羊草为7∶3的混播组合的产量为最高(P0.05),粗蛋白和粗脂肪的总产量最高且投入产出比最低。紫花苜蓿+禾草组合中豆科牧草竞争力均大于相同比例下沙打旺+禾本科牧草组合中豆科牧草竞争力。沙打旺+禾本科牧草混播组合中,相对总产量(RYT)大于1的组合多于紫花苜蓿+禾本科牧草混播组合,其中,沙打旺∶羊草为7∶3的混播组合的两年平均RYT最高。以上结果说明,在宁夏中部半干旱带建植栽培草地时,紫花苜蓿∶羊草为7∶3的混播组合有较好的产量效应和最低的投入产出比;而沙打旺∶羊草为7∶3的混播组合中不同物种生长较为均衡。  相似文献   

基于模糊数学感官评价和混料设计的低度甜糯玉米酒原料配方优化     

崔莉  李大婧  高小女  刘春泉 《核农学报》2015,29(1):106-112

为了优化以鲜食甜糯玉米为主要原料制备甜糯玉米酒的原料配方。试验运用模糊数学原理,将甜糯玉米酒感官品质数学抽象量化,以量化后的感官品质为指标,通过混料试验设计,建立原料配方与感官品质之间的回归模型。结果表明:该模型的拟合程度好(R=0.984 4,P0.001),可用于预测和分析甜糯玉米酒的感官品质。经模型优化可得,感官品质评价为"好"的甜糯玉米酒原料配方为鲜食糯玉米(66%)、鲜食甜玉米(17%)和糯米(17%)。本研究酿造的甜糯玉米酒的酒精度仅为4.75%,远低于一般低度酒,符合现代人的饮酒需求。  相似文献   

超细煤水浆与柴油混合液的流变特性     

潘君拯  谭群 《农业机械学报》1992,23(3):12-18

煤水浆(CWM)是一种新型的正在开发的可工业化的石油代用燃料。而将煤水浆用于柴油机则处于试验阶段。流变特性是煤水浆性质判定的主要依据之一。本文将就下列三方面对超细煤木浆与柴油组成的混合液(用作柴油机燃料)的流变特性进行分析:(1)流变模型和流变参量;(2)超细煤水浆与柴油的最佳混合比;(3)触变性。  相似文献   

基于SLMD的生物质热解动力学预测模型     

樊永胜  蔡忆昔  李小华  焦丽华  俞宁 《农业机械学报》2015,46(5):179-184

采用单纯形格子混合设计法(SLMD)对纤维素、半纤维素和木质素3种生物质组分进行复配优化设计,并在综合热分析仪上进行了热解试验。分析了3组分混合热解特性,建立了由生物质3组分比例直接计算动力学参数的预测模型,对模型进行了试验验证。结果表明:纤维素热解反应级数较低(1.20),活化能较高(134.50 k J/mol),指前因子较大(3.49×1012s-1),热解较为迅速与剧烈;半纤维素和木质素热解的反应级数较高(1.30、1.32),活化能较低(33.51、19.98 k J/mol),指前因子较小(9.43×103、107 s-1),热解较为缓慢;3组分在混合热解中对动力学参数存在交互影响,纤维素对活化能和指前因子的影响较为显著,而半纤维素与木质素对反应级数的影响较大;动力学参数预测模型精度较高,可有效预测生物质热解动力学参数。  相似文献