Evaluation of Physical Characters of soybean in the northeast region of China     

秦智伟  周秀艳  刘宏宇  怀凤涛  焦光纯 《中国农学通报》2005,21(4):133-133

以东北三省86份大豆品种资源为材料,对其与大豆加工适应性有关的物理性状进行分析评价。为东北三省大豆品质育种及选择适于不同加工用途的专用大豆品种提供依据。结果表明：黑龙江省大豆品种的平均表现是发芽率较高,蒸煮大豆硬度低,浸泡大豆的完整率高,破皮和破瓣率较低;吉林省大豆品种的平均表现是原料大豆的完整率高,障碍率低,黄度值较大,浸泡大豆硬度大,石豆率较低;辽宁省大豆品种的平均表现为百粒重大,原料大豆的障碍率高,浸泡和蒸煮大豆的硬度较大,浸泡大豆破皮和破瓣率较高,发芽率、黄度值较低。  相似文献   

二甲醚发动机的研究与开发     

赵忠才  焦凤芹  谭荣军 《农业装备与车辆工程》2006,(9):43-45

介绍了二甲醚作为代用燃料的性能优势,二甲醚发动机的结构、原理和排放应对措施  相似文献   

A mathematical model for border irrigation II. Vertical and horizontal recession phases     

V. P. Singh  F. X. Yu 《Irrigation Science》1987,8(3):175-190

Summary This paper, second in a series of three, develops a mathematical model, using the volume balance approach, to simulate vertical and horizontal recession of border irrigation. An equation is proposed for computing Manning's roughness factor N in both laminar and transitional flow regimes in recession phases. The model has four parameters which can be determined experimentally. Experimental data from ten vegetated as well as nonvegetated borders were used to verify the model. Average difference (AD) between calculated and observed vertical recession times was less than 4.4 min, and between calculated and observed horizontal recession times less than 4.6 min for the ten experimental data sets. Average relative error (ARE) in computed horizontal recession was less than 13% for these data sets. The model was found to be especially accurate for Reynold's number between 1,800 and 2,500.  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   

考虑部件弹性变形的平衡悬架运动干涉分析   总被引：1，自引：0，他引：1  

张子春  马力  王皎  王元良  徐达 《拖拉机与农用运输车》2006,33(4):66-68

研究了某特种重型车三轴平衡悬架在考虑车架、摆臂等主要部件弹性变形基础上的运动干涉校核问题,建立了基于整车的有限元计算模型并进行了计算分析。计算分析结果表明,对于特殊情况下不考虑车架等主要部件的弹性变形进行多轴平衡悬架运动干涉校核是不充分的,可能会得到不正确的结果。  相似文献   

非邻域相干系数估计的PolInSAR树高反演算法   总被引：1，自引：0，他引：1  

苏宝峰  李锦伟  靳标  郭交 《农业机械学报》2015,46(12):268-273

为了提高全极化干涉合成孔径雷达树高反演精度,提出了一种基于非邻域窗口相干系数估计的Pol In SAR树木高度反演算法。该算法首先求取4对全极化干涉SAR图像的最优干涉相位图,再以局部窗口内像素的幅度和相位联合条件概率密度为准则选取与当前像素满足独立同分布的样本,进而获得相干系数的准确估计值,最后采用三段法进行树木高度反演。对仿真数据的处理结果表明,所提算法能够提高观测场景中树木高度的反演精度,并且能够很好地保持图像中的边界细节信息。  相似文献   

高压静电预处理技术对番茄保鲜的影响   总被引：16，自引：0，他引：16  

张全国  焦有宙  张泽星  黄伟  朱彦 《华中农业大学学报》2002,21(6):558-562

研究了高压静电预处理后的番茄在保鲜过程中的呼吸强度、抗压强度以及失重情况的变化规律。结果表明，利用电场强度为150kV/m的高压静电场预处理番茄45min后，可使自然条件下番茄的呼吸高峰推迟4d后出现，并发现高压静电预处理能有效地保持番茄较高的表面抗压强度和较低的失重率，延长番茄的贮藏保鲜时间。  相似文献   

Improvement of Appearance Traits of elite Rice Zhenshan 97B by Molecular Introgression of Targeted about 800 kb Interval from Indica Rice Jiafuzhan Genome     

X.J. Fang * L.R. Jiang Hainan Institute of Tropical Agricultural Resources  Sanya    China  Life College  Xiamen University  Xiamen  Fujian  China. 《分子植物育种》2007,5(2):209-210

Rice appearance trait is mainly mean grain length (GL), grain width (GW), ratio of length and width (L/W), chalkiness (CH) and transparence (TR). Appearance is the first impression, and rice appearance traits effect significantly the value of commodity. Hybrid rice is relatively low quality, especially on rice appearance quality,which restricts partially its extend and badly export of hybrid seed and rice in China.Shanyou 63, the most famous hybrid rice combination of China, could not be also sustainable application because of its poor qualities. In this studies, We attempt to improve appearance quality of the elite rice maintainer of Zhenshan 97B by using molecular approach of genomic interval targeted introgression. Three F2 populations were constructed to study the classical and molecular genetic of rice appearance traits, at the same time, molecular marker-asisted toimprove the main maintainer line, Zhenshan 97B were performed. There some following results:Three F2 populations were constructed based on crosses of Guangluai 4×Jiafuzhan (GJ popu.), Minghui 86×Jiafuzhan (MJ popu.) and Zhenshan 97B×Jiafuzhan (ZJ popu.). ZJ popu and GJ popu were produced to reconstruct the linkage maps related with rice appearance traits based on BSA, and detect QTL of target traits based on IM.In ZJ popu, 9 QTLs of target traits were detected. The interval, RM169～RM516 on Chromosome 5, was genetic locus of GW, L/W, CH and BW, and the explained variances were 10.9%, 14.9%, 12.0% and 14.2%, respectively.RM214 on chromosome 7, RM339 on chromosome 8 were genetic loci if CH and BW, and the explained variances were 9.4%, 10.0%, 11.0% and 12.1%. besides there is a genetic locus, RM347, of G/W on chromosome 3, and the explained varance was 10.3%. In GJ popu, 5 QTLs of rice appearance traits were detected. The interval, RM169-RM516 on Chromosome 5, were also the genetic loci of GW, CH and BW, and the explained variances were 9.0%, 12.5%, and 13.6%, respectively. RM264～RM80 on chromosome 8 was the genetic loci of GW amd L/W,and the explained variances were 14.7% and 13.4%. The genotypes of all QTLs, except RM214, from Jiafuzhan contributed to improving riee appearance traits.The research was to improve the rice appearance quality of Zhenshan 97B by introgressing QTLs of rice appearance traits from Jiafuzhan, a donor parent, by means of MAS in the process of recurrent backcrossing, 4 SSR markers were used to detect the target genotypes from donor parent, and 70 SSR primers to identify the genetic background of recurrent parent. Consequently, there were 19 target individuals in BC3, in which the mean value of GL, GW, L/W, CH and BW were 6.06±0.04mm, 2.50±0.02mm, 2.43±0.02, 29.5±2.7 and 29.4±2.7%, respectively,and the mean homologous degree (HD) to recurrent parent is up to 98.22%. Compared to Zhenshan 97B, GL, CH and BW decreased 0.17 mm, 34.9% and 34.5% respectively and however L/W increased 0.19. which accounted separately for 25.37%, 54.79%, 54.57% and 10.50% of thedifference of every trait between two parents. It is very luckly to find a individual, 13BC2-3BC3 line, whose GL, GW, G/W, CH and BW were 6.04 mm, 2.43 mm, 2.49,2.5% and 2.5% separately, There is very important signification for it to be used in hybrid rice breeding improving appearance traits. In the research, MAS efficiency of 3 loci (with 4 markers ) was 5.68% and coincident degree was 73.08%.  相似文献   

Cloning and Sequence Analysis of Lipoxygenase Gene cDNA from Cucumber Fruit （Cucumis sativus L.）     

Lipoxygenases are nonheme-iron-containing dioxygenases that catalyze the hydroperoxidation of unsatrated fatty acids containing a cis  cis-  -pentadiene structure producing hydroperoxy acids with conjugated dienes.…… 《分子植物育种》2007,5(2):188-189

Lipoxygenases are nonheme-iron-containing dioxygenases that catalyze the hydroperoxidation of unsatrated fatty acids containing a cis, cis-1,4-pentadiene structure producing hydroperoxy acids with conjugated dienes. LOX activity has been found in a wide range of plants. Typical substrates for LOX in plants are linoleic acid and linilenic acid fatty acids. The function of various LOXs in plants is unknown, but their participation in all stages of plant growth and development has been suggested （Hildebrand, 1989; Siedow, 1991）. Some of the physiological processes in whicn lipoxygenses have been implicated include wounding （Saravitz and Siedow, 1996）, pathogen attack （Melan et al., 1993）, seed germination （Kato et al., 1992）, fruit ripening （Ferrie et al., 1994）, plant senescence （Paliyath and Droillard, 1992）. The study on the role of lipoxygenase in ripening and senescence fruit focused on tomato and strawberry. Cloning LOX gene of cucumber fruit will make us further understand the molecularaction mode of this enzyme during fxuit ripening and senescence. In this paper we isolated the partial nucleotide sequences of cucumber fiuit lipoxygenase gene and discuss the characterization of it.  相似文献   

SNP/Tiling Arrays for Genotyping, Mapping, and QTL Candidate Gene Identification     

I will present methods 《分子植物育种》2007,5(2):240-240

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