苦荞重金属富集特征及低积累品种筛选

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,苦荞籽粒对重金属的富集能力因元素而异,总体表现出Cd>Zn>Cu>Ni>Pb>As的特征;7个苦荞品种籽粒严重受到Cd元素污染,单项污染指数(P_i)在2.19～3.8之间,污染等级均达高污染;苦荞产量主要受到籽粒Pb含量的影响,皮尔逊相关性系数为-0.665,达到强负相关关系,籽粒中Zn与Ni、Cu含量呈显著强正相关关系,皮尔逊相关系数分别为0.775和0.802;黔苦3号为苦荞Cd低积累品种,黔苦7号苦荞为As、Ni和Pb的低积累品种,黔苦5号苦荞为Cu低积累品种,黔苦4号苦荞为Zn低积累品种。     

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

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.     

感应电能传输超声振动刀柄集成系统

利用传统电磁感应理论研究了无接触感应电能传输系统和应用在超声振动加工系统中的设计方法。针对压电陶瓷型换能器,进行了补偿设计。对集成于刀柄中换能器的节面支撑形式进行了研究,给出了不同形式的节面支撑模型。在不同支撑形式下,分析了离心力对旋转精度的影响以及节面支撑位移振动对刀柄的作用。在此基础上,设计出利用无接触感应电能传输的超声振动刀柄集成系统。通过电能传输和动态特性试验,证明了基于理论分析的设计方法和结果。     

Engineering Memoir and Features Analysis of Dynamics Phenomena in Yanshitai Mine

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.     

基于深度学习的温室大棚实例识别及模型迁移

温室大棚实例提取在蔬菜种植面积测算和产量估计等方面具有重要意义。该研究以高效准确地识别大尺度范围内温室大棚实例为目标,提出了一种基于卷积神经网络和形态学后处理的“区域-边界”实例提取方法,以及单纯迁移模式、尺度适应模式、模型微调模式3种不同的迁移模式。试验结果表明,利用UNet网络构建“区域-边界”多分类模型识别温室大棚实例效果最优（实例召回率达到91.05%）。形态学后处理操作能够进一步优化温室大棚实例提取结果（单元交并比相比于操作前提高10.53个百分点）。探讨了3种模型迁移模式应用在不同场景时的表现,迁移效果由高到低依次为模型微调模式（实例召回率为87.93%）、尺度适应模式（实例召回率为41.72%）、单纯迁移模式（实例召回率为24.15%）。基于“区域-边界”实例提取方法并根据预测区域和训练区域的场景差异选择不同的迁移模式可以快速精准地识别大尺度范围内温室大棚实例,为农业设施的智能化建设提供信息支撑。     

土壤硼吸附动力学与油菜硼反应的关系

The boron adsorption kinetic experiment in soil by means a flow displacement technique showed that the kinetic data could be described with some mathematic equations.The average values of the coorealtion coefficeint for zero-order,first-order,parabolic diffusion ,Elovich,power function and eponential equations were 0.957,0.982,0.981,0.984,0.981 and 0.902 ,respectively,The correlation between adsorbed boron or its other expression form and time were the highest for first-order ,parabloic diffusion Elovich,and pwer function equations,the second for the zeroorder equation,and the tlowest for the exponential equation.The parabloic diffusion equation fitted well the expermiental results,with the least standard error among the six kinetic equation,showing that the monvemetn of boron from soil solution to soil colloid surface may be controlled by boron diffusion speed.The boron content of rape seedling obtained from soil cultvation was correlated with the rate constants of the kinetic equations.The constants of first-order ,parabloic diffusion,and exponential equaitions were significanlty correlated with the boron content of the crop of NPK treatment at a 95% probaility level ,with correation coeffecients being 0.686,0.691 and 0.64 and 0.641,respectively.In the case of zero-order equation,it Was significant at 99% probability level(r=0.736),These results showed that the adsorption kinetic constants of soil boron were closely related with the rape plant response to boron.     

蛋用鹌鹑不同配套系生产性能对比试验

以神丹蛋用鹌鹑(Coturnix coturnix Linnaeus)配套系的生产性能为研究目标,通过与南京农业大学、台湾省、湖北省等地3个蛋用鹌鹑配套系的对比,进行了生产性能的试验。结果显示,神丹鹌鹑经过4个世代的育种后,其蛋重、体重等性状的均匀度较好,14周龄的产蛋率能够达到80%以上,并能够很好地维持,其产蛋率在16、18、20周龄时都高于80%,与其他3个配套系差异显著(P0.05)。神丹鹌鹑20周龄的个体产蛋数达到了73枚,与其他3个配套系的差异达到了极显著的水平(P0.01);并且料蛋比为2.70∶1,优于其他3个配套系,但是差异没有达到显著性水平。4个蛋用鹌鹑配套系的健雏率都在93%以上,但是在受精率和受精蛋的孵化率上,神丹鹌鹑较南京农业大学蛋用鹌鹑配套系低,说明神丹鹌鹑在这2个性状上还有提升的空间。     

抗菌肽Caseicin A氨基酸排列顺序改变对其抑菌活性的影响

Caseicin A是一种细菌发酵生产酪蛋白酸钠时产生的次级代谢产物,目前已有报道证明其对革兰氏阴性和阳性致病菌具有一定的抑菌活性.本试验通过对Caseicin A的氨基酸进行重排,得到了比原始抗菌肽抑菌活性更高的突变体.结果表明,改变抗菌肽氨基酸的排列顺序会引起其抗菌活性的变化,但对于不同的受试菌具有不同的影响.     

低聚壳聚糖的生物学活性及其在畜禽生产中的应用

低聚壳聚糖作为甲壳素、壳聚糖的高级产品,具有水溶性好、生物活性高等特点,文章陈结合近年来对低聚壳聚糖的相关研究,对其生物学活性及其在畜禽生产中的应用作以综述.     

供核细胞对绵羊体细胞克隆效率的影响

【目的】在制作克隆胚胎时,供核细胞直接制约着重构胚的融合数量和发育潜力。研究供核细胞对绵羊体细胞对克隆效率的影响。【方法】从供核细胞的静置时间,研究传代次数与周期处理,供核细胞不同克隆株,不同羊源细胞等,以重构胚融合率和囊胚发育率为检测指标,判定单因素供核细胞对克隆胚胎的影响。【结果】在供核细胞静置时间方面,供核细胞静置15~30 min内完成重构胚制作的融合率极显著高于静置2 h左右的供核细胞组(90.10% vs 78.84%)(P< 0. 01),但囊胚率差异不显著(15.58%vs 14.65%)(P＞0.05);在供核细胞传代次数(d1~d3)和汇合期生长时间方面(24 and 48 h ),各组的融合率差异不显著(70.37%、76.03%、71.92% vs 72.97%)(P＞0.05),但囊胚率有增高的趋势(5.96%、9.06%、15.85% vs 20.16%);在同一供核细胞不同克隆株方面,供核细胞对融合率和囊胚率存在显著(P<0.05)或极显著(P<0.01)的影响;在不同个体方面,供核细胞株对融合率和囊胚率存在极显著的影响(P<0.01)。【结论】15~30 min内的静置供核细胞、传代3次并延长汇合期细胞生长时间(48 h),多选细胞株更有利于克隆胚的制作。