微分响应在降雨误差修正中的应用     

杨姗姗  包为民  杨小强  阙家骏  束慧连  李佳佳 《中国农村水利水电》2015,(1)

误差修正是实时洪水预报研究和应用中的重要内容,从修正模型降雨输入角度出发,提出了一种基于微分响应的降雨误差修正方法,并通过实例论证了该方法修正降雨量的适用性。该方法通过计算降雨所对应模型的微分响应来修正降雨,从而修正出口断面流量过程。将该修正方法结合新安江模型,对闽江建阳流域的19场历史洪水进行了有效性检验,结果表明:此方法对洪量、洪峰的修正效果明显,且能够显著提高洪水预报的合格率,修正后合格率由63.2%提高到94.7%。  相似文献   

明甪直天王殿松木斗拱振动台试验研究   总被引：2，自引：0，他引：2  

阙泽利  李哲瑞  张贝贝  侯同宇  潘彪 《保鲜与加工》2015,(3):26-34

以甪直保圣寺天王殿斗拱为参考对象,进行无缩尺松木斗拱模型的地震台试验研究。通过对斗拱的加速度与动力放大系数变化趋势、斗拱在振动过程中位移响应变化特征、斗拱变形最大时刻和各构件变形最大时刻的滑移位移和回转位移数值对比分析,得出以下结论：地震加速度用于衡量地震烈度,并不能直接反映斗拱试件的最大变形;振动频率的变化对斗拱回转变形的变化起重要作用,振幅是决定各构件水平滑移的主要因素;各构件变形最大值与斗拱整体变形最大值具有很强相关性,其中栌斗和华拱的回转变形对斗拱的整体变形而言,处于支配地位;斗拱的华拱连下昂部分主要起装饰作用,其榫卯连接节点位置在振动过程中较为薄弱,在对实际文物维护修缮过程中应引起重视并采取相关加固措施。  相似文献   

制备植物病毒、细菌抗血清的连续采血法研究和应用     

张作芳  张成良  宋淑敏  胡伟贞  陈京  阙晓枫  陆家珏 《植物保护学报》1987,14(3):173-176

用植物病毒、细菌抗源(加福氏完全佐剂)免疫家兔,从末次免疫后7天开始,1—5个月内进行耳静脉连续采血,1周2次,能获得比心脏采血多15倍的抗血清。耳静脉抗血清用于酶联免疫吸附试验、免疫电镜、反向间接血凝、乳胶凝集试验、免疫双扩散、对流免疫电泳技术检测抗原,均得到很好的结果。  相似文献   

养殖业发展必须走绿色通道     

阙定锟 《中国动物检疫》2005,22(6):12-13

食品安全关系到人类健康和生命安全，是社会安定和经济发展具有战略意义的大事。如生猪高度集约化生产引起的环境污染、疫病传播、滥用抗生素和违禁药品以及兽药饲料添加剂超标等因素，造成猪肉有毒有害物质和超量残留，对人类健康造成重大威胁。动物性食品安全问题已成消费者普遍关注的社会问题。以上问题引起政府高度重视，主要体现在：不断完善食品安全法律法规；加强市场监管和执法力度；开展大规模的专项整治，重点打击制售假劣食品行为；建立适合国情的市场准入制度，强化食品企业的认证制度；推行绿色生态养殖之路。  相似文献   

利用改进的Oligo-Capping法构建甘蔗茎全长cDNA文库     

郭晋隆  阙友雄  刘金仙  郑益凤  陈如凯  许莉萍 《热带作物学报》2009,30(5):672-676

Oligo-Capping法是目前全长cDNA文库构建的重要方法之一.笔者在引进、消化和吸收的基础上,通过对特异引物和接头序列的设计,及cDNA扩增反应条件的优化,对该方法进行了一些切实可行的改进,形成了一套简便易行的技术体系.利用本研究中改进的Oligo-Capping法,成功地构建了甘蔗茎全长cDNA文库.综合评价结果表明,本研究中所构建的甘蔗茎全长cDNA文库的库容大于2.5x106cfu,重组率为91%,全长率高达88.9%.本文库的构建为进一步甘蔗茎中全长基因的克隆和功能基因的表达分析奠定了基础.  相似文献   

杉木悬浮细胞系的建立和原生质体的分离^*   总被引：2，自引：1，他引：2       下载免费PDF全文

诸葛强  阙国宁 《林业科学研究》1992,5(6):628-632

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Nitrogen mobilization, nitrogen uptake and growth of cuttings obtained from poplar stock plants grown in different N regimes and sprayed with urea in autumn     

Dong S  Cheng L  Scagel CF  Fuchigami LH 《Tree physiology》2004,24(3):355-359

Nitrogen mobilization, nitrogen uptake and growth of cuttings obtained from poplar stock plants fertigated with different nitrogen (N) treatments and sprayed with urea in autumn were studied. Stock plants propagated from poplar cuttings were trained to a single shoot and fertigated with 0, 5, 10, 15 or 20 mmol l(-1) N during the first growing season. In October, a subset of stock plants from each N fertigation treatment was sprayed twice with either 3% urea or water, and overwintered outside. In March, total tree biomass and total N concentration and content of stems were estimated for stock plants in each treatment, and cuttings were taken from the middle of each stock plant and stored in plastic bags at 2 degrees C. In mid-April, cuttings were planted in 7.5-l pots containing N-free medium and grown outdoors with a weekly fertigation with nutrient solution containing 0 or 10 mmol l(-1) 15NH4 15NO3. In mid-July, cuttings were harvested, and new shoot (new stems and leaves), shank (old cutting stem) and roots were analyzed for new biomass growth and total N and 15N content. Growth of stock plants was positively related to N supply in the previous growing season. Foliar urea application in autumn had no effect on subsequent stock plant growth even though urea sprays increased both N concentration and content in stem tissues. Biomass growth of cuttings obtained from stock plants was closely related to their N content when the cuttings were grown in an N-free medium regardless of previous treatments applied to the stock plants. When N was supplied in the growth medium, the strength of the relationship between regrowth and N content of cuttings was significantly reduced. Cuttings from stock plants treated with foliar urea and grown in a N-free medium remobilized between 75 and 82% of their total N for new growth, whereas cuttings from plants receiving no urea spray remobilized only between 60 and 69% of their total N for new growth. Current N fertilization of the cuttings reduced the percentage of N remobilized. We conclude that new growth of poplar cuttings in spring was more dependent on currently applied N than on reserve N, and urea N applied as a spray in autumn was more easily remobilized than N taken up by roots during the previous season.  相似文献   

中国无忧树、海南红豆、火焰树、炮仗花     

陈定如  王缺 《广东园林》2011,33(1):77-78,88

中国无忧树（火焰花）苏木科Saraca dives Pierre常绿乔木,高10～25m。树皮灰褐色,平滑,皮孔明显,内皮层淡红色;幼枝近方形而略扁,两侧具凹槽。树冠广卵形。叶互生,一回偶数羽状复叶,小叶4～7对,下部一对较小;小叶片近革质,长圆形至长圆状披针形,  相似文献   

水稻白叶枯病(Xanthom onas campestris pv.oryzae)抗性遗传研究 Ⅲ.两个成株抗性基因X_a-6与X_a-3的等位性分析     

章琦  施爱农  王春莲  阙更生  T.W.Mew 《作物学报》1991,17(3):233-237

研究了两个品种早生爱国3号和辛尼斯对菲律宾水稻白叶枯病菌4个生理小种、日本小种1和我国菌株的成株抗性遗传和抗性基因的等位关系。这两个抗病品种与感病品种沈农1033杂交所得的 F_1、F_2和 B_1F_1群体的成株抗性反应,表明它们均携有一对显性基因。将早生爱国3号同辛尼斯杂交进行直接等位性测定,并将邳早15和蚌珠芒分别与辛  相似文献   

A method for linking in situ activities of hydrolytic enzymes to associated organisms in forest soils     

Shufu Dong  Melanie D. Jones 《Soil biology & biochemistry》2007,39(9):2414-2419

A root window-based, enzyme-imprinted, membrane system has been modified to enable visualization of the activities of hydrolytic enzymes (acid phosphatase, aminopeptidase, chitinase, and β-glucosidase) in situ in forest soils. The approach can be used to correlate the distribution of enzyme activity with visible features such as roots, mycorrhizas, or mycelial mats. In addition, it enables accurate spatial soil sampling for analysis of microbial communities associated with enzyme activities. The substrates are colorimetric conjugates of napthol, where color develops instantly in the field, or fluorimetric conjugates of 4-methylumbelliferone, whose fluorescent products are detected by a gel-documenting system. The method will allow important questions about the relationship between taxonomic and functional diversity of soil microorganisms to be addressed and identification of enzyme activity hot-spots in soil.  相似文献