检索结果-南通市图书馆

Measurement and analysis of restitution coefficient between maize seed and soil based on high-speed photography

International Journal of Agricultural and Biological Engineering 2017年第3期10卷 102-114页

作者： Wang Jinwu Tang Han Wang Jinfeng Jiang Dongxuan Li Xin College of Engineering Northeast Agricultural UniversityHarbin 150030China

The restitution coefficient is an important elementary physical parameter related to the research and development of agricultural *** kinematic model of maize seed in the falling and impacting processes was developed to measure the restitution coefficient between maize seed and soil.A test bench for measuring the restitution coefficient was designed and built referred to the theory of mirror *** velocities for impacting maize seed were measured and analyzed in a three-dimensional space via high-speed photography,and then restitution coefficients of in different impact conditions were *** this basis,this study took flat dent seed and round seed as *** factor tests were conducted to analyze the influences of these factors on the restitution *** impact angle,falling height,soil compaction,soil moisture,maize moisture content and different parts of seed were selected as test *** corresponding regression equations were obtained by *** results showed that,as the impact angle was bigger than 25°,the restitution coefficient increased with the increase of impact *** restitution coefficient had a linear decreasing trend with the increase of falling *** the soil compaction strength was 200-350 kPa,the restitution coefficient increased with the increase of soil *** the soil compaction strength was larger than 350 kPa,the changing trend of the restitution coefficient was relatively *** the soil moisture content was 13.5%-18%,the restitution coefficient decreased with the increase of soil *** the soil moisture content was 18%,the restitution coefficient was the *** the maize moisture content was 11%-16%,the restitution coefficient decreased with the increase of maize moisture *** rotational motion always occurred in falling process of flat dent seed and round *** probabilities of crown part and lateral part of maize seed impacting with soil were the highest

关键词： maize seed soil restitution coefficient mirror reflection high-speed photography measurement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A positioning method for maize seed laser-cutting slice using linear discriminant analysis based on isometric distance measurement

引用

Information Processing in Agriculture 2022年第2期9卷 224-232页

作者： Yingzi Wei Kanfeng Gu Longtian Tan School of Information Science and Engineering Shenyang Ligong UniversityShenyang 110159China Advanced Manufacturing Technology Laboratory Shenyang Institute of AutomationChinese Academy of ScienceShenyang 110016China

It is necessary that vision system should aid laser-cutting manipulator to position the specified part of each maize seed for getting the slice breeding genotype analysis with high *** of trivial maize seeds should be recognized and positioned in a certain *** area ratio(CAR)is defined as the metric of pixel attribute.A large template of round mask is adopted for seed morphological detection to measure the CAR val*** get the feature points extracted from the seed image through the isometric mapping *** processes of linear discriminant analysis search the morphological data space to learn non-linear transformations to the space where data are linearly *** discriminant analysis utilizes the data directional distribution to position the major axis and distinguish different parts of maize *** labeling partition operation is applied for picking out the scattered pieces to be finely *** denoising process,the feature region could be recognized with accuracies by the synthetical *** experiments on a large amount of seeds demonstrate the effectiveness of proposed methods.

关键词： Feature regions Isometric mapping Linear discriminant analysis maize seed Molecular marker-assisted breeding technology

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Estimation of Mycotoxin Multiple Contamination in Mexican Hybrid seed maize by HPLC-MS/MS

引用

Agricultural Sciences 2015年第9期6卷 1089-1097页

作者： Silvia Denise Pena Betancourt Benjamín Valladares Carranza Eduardo Posadas Manzano Department of Animal and Agricultural Production Laboratory of ToxicologyUAM-XMéxicoD.F.México Center of Research and Studies in Animal Health FMVZUAEMTolucaMéxico Department of Animal Ruminants Faculty of Veterinary MedicineUNAMMéxicoD.F.México

In Mexico, the presence of mycotoxins in chemical treated seed maize by sowing is not well known, despite the need to improve the quality and corn safe for human consumption. It collected twenty-five genotypes maize samples from Morelos State in the spring of 2013, all of them treated with synthetic colors (pink, green, yellow), fungicides and insecticides. Two samples (synthetic seed and hybrid commercial) were selected for analysis of twenty-two mycotoxins by LC-MS/MS and AFB1 determination by liquid chromatography and fluorescence detection (HPLC-FLD). The results of the 25 samples showed the presence of Aflatoxin B1 in 25% of samples in a ranged concentration between 2 to 6 μg·kg-1, and average of 4.1-1 μg·kg, which were within the allowed limits by national and international legislation. Twenty-two mycotoxins were found in levels ranging between 791.7 and 891.2 μg·kg. The content average in both samples was for total aflatoxins (AFB1, AFB2, AFG1, AG2) of 16.95 μg·kg, with G aflatoxins the most prevalence. Twelve trichothecenes (Nivalenol, Neosolanol, Fusarenone X, DAS, HT-2, FB1, FB2, FB3, T-2, Zearalenone, ZEA2, ZEA3) were in a level of 292.7 μg·kg-1, Enniantine 8.6 μg·kg-1, Sterigmatocystin 6.5 μg·kg-1, Roquefortine C, 2.9 μg·kg-1. Ochratoxin 8.8 μg·kg-1 and Mycophenolic acid at 535 μg·kg-1 were the highest content. The synthetic color present in seeds analyzed inhibited a good purification in the extracted mycotoxin by optimizing the step in HPLC-MS/MS quantification system. The information generated in this study would be useful in breeding programs in order to improve the sanitary quality and also to investigate the final contamination of agricultural products with multiple mycotoxin contamination.

关键词： maize seed Warehouse Moulds Mycotoxins HPLC MS/MS

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Early Morphological and Physiological Events Occurring During Germination of maize seeds

引用

Agricultural Sciences in China 2008年第8期7卷 950-957页

作者： MEI Yu-qin SONG Song-quan Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Mengla 666303 P.R.China Institute of Botany Chinese Academy of Sciences Beijing 100093 P.R. China

The early morphological and physiological events occurring during maize （Zea mays cv. Nongda 108） seed imbibition and germination were studied. Water uptake of seeds exhibited a triphasic pattern with a marked increase during the initial phase of imbibition, and then a slow increase, followed by a second substantial increase. Imbibition time for 10 and 50% of seed germination was about 26 and 46 h at 30℃, respectively. The relative conductivity of maize seeds dramatically decreased during the initial phase of imbibition, followed by a substantial increase. Respiratory rate of seeds gradually increased with imbibition. Length of root cap cells decreased during the initial phase and then increased; those of meristematic zone cells increased during the initial phase and then decreased; and those of elongation zone cells and of the whole elongation zone of the radicle gradually increased during germination. The contents of soluble sugars and starch in embryos gradually decreased as the activities of α- and β-amylase strikingly increased with imbibition. In the meantime, protein contents of embryos gradually decreased and free amino acid content increased. The activities of aminopeptidase and endopeptidase increased until 12 h of imbibition and then decreased. It is concluded that germination of maize seeds is mainly completed by extension of cells in the elongation zone of the radicle, and that mobilization of stored reserves in the embryo during the initial phase of imbibition is also an early event during seed germination.

关键词： α-and β-amylase aminopeptidase cellular morphology endopeptidase germination maize seed

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Relationship of Ultraweak Luminescence Intensity with Physiological Metabolism of maize seeds during Artificial Aging

引用

Agricultural Science & Technology 2017年第2期18卷 231-233,237页

作者：田茜段乃彬李群颜廷进戴双贾文斌张文兰山东省农作物种质资源中心山东济南250100

The seeds of maize （Zea mays L.） variety Zhengdan 958 were used to study the change of ultraweak luminescence （UWL） intensity and its relationship with seed vigor, relative electric conductivity and ATP content during artificial aging. The results indicated that the germination percentage, germination potential, germination index, UWL intensity and ATP content decreased gradually, while the relative electric conductivity increased with the prolongation of artificial aging. The correlation analysis showed that UWL intensity was significantly positively correlated with ger- mination percentage, germination potential, germination index and ATP content, while significantly negatively correlated with relative electric conductivity. It was concluded that UWL was closely related to the energy level symbolized by ATP content, and as a fast nondestructive physical indicator with better sensitivity, it could be applied into the study of seed vigor nondestructive testing.

关键词： maize seed Artificial aging seed vigor Ultraweak luminescence ATP

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：