地温空调井抽回灌效果影响关键因子识别     

张彦  窦明  朱志刚  宋晓阳  洪梅  孟秀霞 《节水灌溉》2015,(6)

为了探析引起地温空调井抽回灌效果的主要制约因素,通过单相关系数分析、主成分绝对得分的源解析模型、拟合度检验和多元线性回归的方法分析影响单井回灌效率的影响因素。结果表明:井径、滤水管孔隙率及抽回灌井数比与单井回灌效率的相关性和拟合度较好,故将井径、滤水管孔隙率及抽回灌井数比作为影响单井回灌效率的关键因子,同时分析了单井回灌效率与关键因子的之间的拟合方程及多元线性回归方程,得到了单井回灌效率与关键因子之间的定量关系。  相似文献   

喷播机自动导航控制系统设计及其性能仿真   总被引：1，自引：0，他引：1  

庄新斌  宣传忠  陈智  刘海洋  陈燕 《农机化研究》2015,(11):87-90

以嵌入式触摸屏为开发平台,编写了GPS、电子罗盘和超声波传感器Lab VIEW数据采集程序;根据传感器采集的数据,用阶跃信号模拟上位机给喷播机的信号,喷播机以14.4、10.8、7.2、3.6km/h的速度分别在MatLab环境下对该自动导航控制系统进行了模拟测试。经过多次仿真,校正PID参数,结果显示:喷播机运行速度在7.2~10.8km/h,喷播机跟踪上位机信号时间为3~4s。其中,检测信号时间为1~2s,速度最大偏差量在0.36~0.9 7 km/h之间,符合针对草原地形下喷播机作业的要求。  相似文献   

梯形组合刀盘设计及作业性能试验     

史岩鹏  翟长远  朱瑞祥  闫小丽  葛世强  李成鑫  时永 《农机化研究》2015,(12):182-187

针对免耕播种机开沟器工作中容易出现缠草堵塞、草土混杂及干湿土混杂影响播种质量的问题,设计了一种新型梯形组合刀盘,制作了试验装置,并进行了土槽和田间试验。试验表明:梯形组合刀盘在秸秆覆盖量不大于1.2kg/m2时,通过性满足要求;梯形组合刀盘工作时组合刀盘和开沟器先后开出"W"沟和"V"沟,草土分离系数达95%,干湿土分离系数可达91.7%。梯形组合刀盘破茬防堵性能可靠,实现了草土分离及干湿土分离,可为种子萌发及出苗创造良好条件。  相似文献   

基于CPLD的漏播检测装置的设计与测试     

赵艳华  龚丽农  尚书旗  王延耀  于艳 《农机化研究》2015,(9):126-130

针对现有漏播检测装置并行性差、响应速度慢等不足,提出一种新型的漏播检测装置。该装置采用复杂可编程逻辑器件(CPLD)作为检测控制核心,能够同时提供8路落种检测,适用于大型精密穴播机械。该检测装置采用光电器件作为落种传感器,响应快速准确。6对红外对管采用特殊方式排列在排种管的相对两侧,避免光线干涉,提高检测精度。该装置适用于检测直径3mm以上种子(如麦粒、黄豆、玉米粒等),能够配合上位机GPS精确定位漏播位置,为漏播后的补种修正提供位置和数目信息。手工落种测试时,对小麦、黄豆、玉米种子的检出率可达100%。将该装置在播种试验台上进行实验,统计自动落种数目,精度可达95%以上;对单粒漏播进行报警统计,精度可达80%以上。改进试验台实验条件,以自适应方式运行可以使装置的检测精度进一步提升。  相似文献   

灰关联决策在水质面板数据处理中的扩展及应用     

陈继光 《节水灌溉》2015,(4):63-65

针对面板数据灰色关联决策分析评价问题,在经典灰色关联分析和灰色综合评价方法的基础上,构建面板数据灰色关联决策评价模型。将灰色关联决策方法扩展到面板数据分析中,解决了小样本面板数据的灰色评价分析问题。将这种方法应用于水环境面板数据质量评价中,经实例计算验证了面板数据灰色关联决策评价模型的稳定性、合理性和实用性,为水环境面板数据质量分析评价提供了可行的计算思路和方法。  相似文献   

日光温室青花菜耗水规律及水分利用效率的研究     

廉晓娟  王艳  杨军  张余良  王正祥 《节水灌溉》2015,(1)

在膜下滴灌条件下,研究了温室秋茬青花菜不同生育阶段控制水分对耗水规律、水分利用效率以及产量的影响。结果表明,青花菜全生育期内耗水量、耗水强度均表现为苗期﹥莲座期结球期的规律;水分生产函数的敏感指数为结球期﹥苗期﹥莲座期,因此青花菜节水宜在莲座期进行,结球期应保证水分供应充足,避免减产;苗期和莲座期分别控制灌水量为常规灌水量65%的处理,产量高、水分利用效率较高,是青花菜适宜的灌溉量。  相似文献   

加强农业技术推广体系建设的对策     

何艳 《湖南农机》2015,(3):7-8

近年来农村的发展逐渐受到重视,农村的建设也取得了比较好的效果。当前为了更好地促进农业的发展和农村的建设,加强农业技术推广体系的建设逐渐得到认可。农业技术推广对于转变农业发展方式,促进农业经济的发展和农村的建设有着积极的作用。但是农业技术的推广中也遇到了一些困难,当前需要及时解决农业技术推广的障碍,更好地促进农业的发展。  相似文献   

Analysis of Physicochemical Indexes of Junggar Bactrian Camel Milk     

ZHANG Meng-hua  CHEN Gang-liang  ZANG Chang-jiang  DONG Jing  HUANG Xi-xia  LU Dong-lin 《中国畜牧兽医》2016,43(10):2628-2633

This study was aimed to systematically analyze the difference of camel milk physicochemical index of different seasons,stage of lactation,production sites and milk station.Collected 18 372 testing data about raw camel milk quality which were purchased by a company in 2015.The range of each index was determined by the four point test method,SAS 8.1 least squares analysis of variance were performed on the processed data.The results showed that different area,milk stations,stage of lactation and season effect of camel milk had extremely significant influence (P<0.01) on the relative density,fat,non fat milk solid,milk protein,lactose,freezing point and ash.Therefore,the reproduction and childbirth of Bactrian camel had strong periodicity and seasonality,lead to a larger difference in camel milk yield and physicochemical index of different seasons and months within a year,at the same time,camel milk producers could learn about the quality of camel milk situation of different production sites,milk station,stage of lactation and season using such analysis methods,the quality of camel milk product was determines by the physical and chemical indicators and health conditions of the raw camel milk.  相似文献   

Study on the Change Rule of Egg Yolk Antibody in Laying Hens after First Immunization by Japanese Encephalitis Virus     

WANG Chao-qun  FANG Xu  SONG Zi-yu  HUANG Yan  PANG Jie  ZHAO Jian-guo 《中国畜牧兽医》2016,43(10):2786-2791

The purpose of this experiment was to study the immunization rule of the egg yolk antibody affected by different vaccines,immunization dose and injection ways and further to discuss the optimal immunization procedures of the laying hens for the preparation of egg yolk antibody against swine Japanese encephalitis virus.180 brown laying hens without any vaccines were selected and divided into 18 groups randomly,each group of 10 hens.Groups 1,2 were the control groups,injected with the sterile saline;Groups 3 to 10 were injected with subcutaneous or intramuscular injection,and the vaccine was injected with 0.2,0.5,1.0 and 1.5 mL successively.Groups 11 to 18 were also adopted two kinds of injection,followed by the same dose of vaccine immunization.Six eggs of each experimental group were gathered before immune day and after 3,7,10,14,18,21 and 28 days,the egg yolk antibody was extracted and the titer was determined.As a result,the egg yolk antibody titers of groups 1 to 6,11 and 12 were all 0,and no significant immune response produced;The hens from 7 to 10 groups were injected with the inactivated vaccine.After 7 days,the average antibody titer reached the peak,and the duration of the antibody was 14 days.The hens from 13 to 18 groups were injected with the attenuated virus vaccine.After 14 days,the average antibody titer reached the highest value,and the duration of the antibody was 21 days.The egg yolk antibody titers were not significantly different in the two compared experiment groups with the same injection dose but with different injection ways (P>0.05).With the same injection way of each experiment group,and the difference was significant (P>0.05).Compared with some groups with the same injection and vaccine,the titer of yolk antibody was gradually increased with the increase of the immune dose,and the difference was significant (P<0.05).The results showed that,no matter intramuscular or subcutaneous injection,in order to produce a significant immune response to hens,the immune antigen dose was 1.0 mL inactivated vaccine or 0.5 mL attenuated vaccine at least.Compared with the attenuated and inactivated vaccine,inactivated vaccine stimulated the body to produce the antibody faster,but the maintenance time was shorter;The lower dose of attenuated vaccine could stimulate the body to produce antibodies,but the speed was slower,the maintenance time was longer.  相似文献   

Blood Typing of Asiatic Black Bear (Ursusthibetanus)     

LI Qin  CHEN Yu-cun  ZHAO Feng-yong  ZHANG Jia-min  ZHANG Shu-hui  ZHU Zi-yan 《中国畜牧兽医》2016,43(7):1850-1855

In this study,we aimed to determine whether bear had different blood group systems.Whole blood samples were collected from 40 Asiatic Black bears in Fujian province,China.Tube method was used to detect antibodies in plasma,and antibody isotype was determined with 2-mercaptoethanol.Plasma was further analyzed by mass spectrometry.The plasma from four bears had antibodies,possibly IgM isoform,which could agglutinate RBCs from 30 bears.Blood samples from 10 bears were tested by human blood typing reagents.The results showed that 4 bears had blood type like human type O,while 6 bears had like human type B.Plasma protein had extensive homology to serum albumin-like isoform 1 found in giant panda (Ailuropodamelanoleuca).We suggested that Asiatic Black bear might have at least one blood group system with two blood types.If the sick bear needs blood transfusion,a cross-matching test was necessary.Moreover,giant panda might receive blood from Asiatic Black bear in case of emergency.  相似文献