木荷芽苗切根移栽育苗技术     

皮宝珍 《江西林业科技》2001,(4):14-15

木荷是我省造林的主要阔叶树种，木荷芽苗地奶移栽可使苗木粗壮，均匀，侧须、根发达；有利造林成活和林木速生丰产。  相似文献   

Design of a Micro Transfusion Monitoring System Face to Community Hospital     

YANG Li-li  PI Xi-tian  PENG Cheng-lin  Xiao Xiao 《保鲜与加工》2007,(6):56-60

A micro transfusion system faced to community hospital is presented.The system has real-time monitoring and alarming(when there exit abnormal instance or the transfusion is completed) functions,which well settle the inconvenience of venous transfusion in clinic,and increase the security and efficiency.In this system,the Photoelectric sensor technology and signal processing technology are applied to acquire the reliable detection of the transfusion.And microcontroller(MCU) and digital display technology are employed to count,display and monitor the quantity and velocity of the liquid,and alarm when there has no liquid or a jam.Moreover,the network technology is also added to the system to realize tele-monitor.At last,the authors briefly introduce the status of the system's application,and point out system's flaws and the main work in the following research.  相似文献   

Finite Element Simulate Analysis of Small Span-to Depth Ratio Coupling Beams with Special Reiforcement     

FU Jian-ping  XU Rui-chang  PI Tian-xiang  BAI Shao-liang 《保鲜与加工》2004,(9):137-142

Test investigations show that the reinforcement scheme with adding diagonal and rhombic bars to traditional reinforcement in the foundation is an ideal way, for the seismic performance of small span-to depth ratio coupling beams with this scheme is better than that of traditional reinforcement. Because the regions in the small aspect ratio coupling beam belong to D-regions, in which the Bernoulli hypothesis of plane strain distribution is invalid, the traditional bending theory can not be used. This paper simulates the coupling beam through non-linear finite element analysis program, and contrasts the analysis result of the bar's stress distribution with test result. The contrast results confirm that it is a valid way to analyse the bar's stress distribution in this coupling beam through non-linear finite element analysis program.  相似文献   

Engineering Memoir and Features Analysis of Dynamics Phenomena in Yanshitai Mine     

TANG Jian xin  DAI Gao fei  YIN Guang zhi  PI Wen-li 《保鲜与加工》2002,(6):109-112

The depth of coal mining in Yanshitai mine is over 600 m,dynamics phenomena have been occurred of ter during mining ahd excavating.On the basis of research in Yanshitai mine,this paper recorded the geology and mechanics model of typical dynamics phenomena based on the mining and geology conditions,which have been applied for the mechanism of dynamics phenomena and studied with catastrophe.Meanwhile,the features and influence factor have been studied,and they can be references for mine hazards.  相似文献   

苦荞重金属富集特征及低积累品种筛选     

毛旭  龚思同  舒洁  皮永菲  娄飞  马智黠  钱晓莉  何腾兵  付天岭 《种子》2022,(1):19-25

以贵州省威宁县7个当地主栽的苦荞品种(黔黑苦1号、黔苦2～7号)为材料,通过大田试验,研究不同苦荞品种对土壤中镉(Cd)、砷(As)、铅(Pb)、镍(Ni)、铜(Cu)、锌(Zn)等6种典型有害重金属的富集能力差异,采用内梅罗综合污染指数法评价苦荞受多种重金属污染情况,筛选重金属低积累的苦荞品种.结果表明,苦荞籽粒对重...  相似文献   

景墙在景观环境中的功能属性     

皮微  杨柳青 《现代农业科技》2012,(6):243+246

通过挖掘景墙在景观环境中的功能,阐述了相应功能的表达方式,列举了相关场所对景墙的功能要求。  相似文献   

响应曲面法对蛹虫草多糖超声提取工艺的优化效果     

邓黎  周同永  韩涛  赵晓辉  皮立  韩发 《贵州农业科学》2012,(8):187-190

为了优化蛹虫草多糖超声提取工艺,采用响应曲面法,根据中心旋转试验设计,研究超声提取时间、提取温度和液料比等工艺条件对提取率的影响。结果表明:蛹虫草多糖超声提取最佳工艺条件为超声提取时间65min、温度80℃、液固比32mL/g、提取2次,提取率可达3.89%。  相似文献   

论农产品加工业对县域经济的促进作用     

皮业林 《湖南农业科学》2012,(5):78-80,84

分析了湖南省农产品加工业的发展现状,指出了湖南省农产品加工业发展中存在的问题,阐述了农产品加工业具有壮大县域工业经济、增加县级财政收入、转移农村劳动力和提供就业岗位、增加农民收入等作用,并从原料基地建设、加工产能布局、技术创新提升、发展现代物流4个方面提出了依托农产品加工业促进县域经济发展的对策。  相似文献   

基于滑模观测器的永磁同步电机无位置传感器控制的研究     

黄飞  皮佑国 《湖南农业大学学报(自然科学版)》2009,(2)

简要论述滑模观测器的理论基础,根据PMSM的数学模型,建立基于滑模观测器的PMSM无传感器控制的系统模型.根据滑模观测器原理,通过电机的定子电压和相电流估算出电机的转角和转速.利用MATLAB工具建立无位置传感器的永磁同步电动机调速系统的仿真平台,仿真实验检验滑模观测器法的有效性.在采用DSP2812的伺服控制平台上,验证滑模观测器法的正确性和可行性.实验结果表明滑模观测器法具有良好的动静态性能.  相似文献   

河源独头火蒜与独头蒜挥发成分测定     

李叶青  皮小弟 《安徽农业科学》2016,44(19)

[目的]了解河源火蒜与普通蒜的香气成分差异。[方法]采用静态顶空进样-气相色谱-质谱联用法(SHS-GC-MS)对河源独头火蒜和独头蒜的挥发性物质及含量进行分析。[结果]该试验条件下,共检出独头蒜挥发性风味成分主要有23种,12种为含硫化合物,其中主要成分是二烯丙基三硫醚(25.11%)、二烯丙基二硫醚(19.78%)、3,4-二甲基-1,2-二硫环戊烯酮(18.65%)、二氧化硫(5.20%)、3-乙烯基-1,2-二硫环戊烯(2.61%)、烯丙基甲基硫醚(2.31%)、2-乙烯基-1,3-二噻烷(2.07%)、2-恶唑烷硫酮(2.00%)、甲硫基乙腈(1.78%)、硫氰酸乙酯(1.28%),共占总含量81.73%;共检出独头火蒜主要挥发性风味成分也为23种,14种为含硫化合物,其中主要成分是二烯丙基三硫醚(38.03%)、二烯丙基二硫醚(22.63%)、3-乙烯基-1,2-二硫环戊烯(7.95%)、3,4-二甲基-1,2-二硫环戊烯酮(7.55%)、二氧化硫(4.08%)、甲硫基乙腈(4.04%)、二烯丙基硫醚(2.99%)、异硫氰甲酸甲酯(2.08%)、硫氰酸乙酯(1.49%)、烯丙基甲基硫醚(1.41%)、硫化丙烯(1.25%)、2-乙烯基-1,3-二噻烷(1.15%),共占总含量95.59%。[结论]河源独头火蒜的挥发性物质的数量和含量比普通独头蒜都高。  相似文献