利用冬枣幼园空地繁育枣苗经验     

潘晓  宋平 《西北园艺》2005,(8):35

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Mechanism of Human-Machine Cooperation Based on Agent and the Role of Human Being     

HUANG Xi yue  LIU Wei hong  MA Xiao xiao  ZHU Lei  HUANG Min  NI Lin 《保鲜与加工》2002,(9):32-35

Continuous industries CIMS is a complex system consists of human and machines under certain environment. It has been proved that there is limitation to only pursue high degree intelligent system, so the idea of human machine can be used to research CIMS under system theory viewpoint. Combining advanced multi agent technology and theory, a human machine cooperation mechanism with agent as the middle medium is presented which can provide a more flexible information mutual interface. In addition, the roles of human and machine under this new mechanism are analyzed.  相似文献   

基于SWAT模型的洞庭湖区间径流模拟研究   总被引：1，自引：0，他引：1  

谢南  刘攀  宋平  郑颖  徐锐 《中国农村水利水电》2020,(5):39-41,52

在人类活动强烈的在平原湖区,由于DEM精度较低,很难反映围湖造田形成的大量堤垸,径流的汇流过程亦会受到人工排涝的影响。针对人类活动强烈的洞庭湖湖区,结合GoogleEarth遥感卫星数据,识别出堤垸区的边界,以此修改研究区域的DEM来实现子流域的划分。对于堤垸区的汇流计算,采用天然出流过程的过去n d平均,以此反映人工排涝过程,从而能更好地利用SWAT模型对洞庭湖未控区间进行模拟。利用修改的DEM和过去n d平均出流的模型对流量进行了模拟,结果表明,改进后模型率定期的效率系数从0.88提高到了0.9,验证期的效率系数从0.85提高到了0.88。提出的模型改进方法,可为于平原湖区的水文模拟提供参考。  相似文献   

利用低场核磁共振分析水稻种子浸泡过程中的水分变化   总被引：3，自引：8，他引：3  

宋平  杨涛  王成  潘大宇  任鹏 《农业工程学报》2015,31(15):279-284

为研究水稻种子在浸泡过程中的水分变化情况,应用核磁共振无损、非侵入的技术优势,根据弛豫时间呈现的多组份特征,通过弛豫谱分析水稻种子不同相态水分的变化和流动过程,确定弛豫谱峰值总面积与水稻种子吸水率的回归方程,研究了水稻品种(沈农9816号、沈农9903号)及浸种温度(18、24、32℃)对水稻种子吸水量的影响。试验结果表明:通过弛豫谱峰值总面积可以合理估测水稻种子的吸水率;水稻种子在6h浸种过程中,随着浸泡时间的增加结合水及总水含量变化趋势为不断上升,自由水则呈现不规则的反复变化态势;水稻种子吸水量在2个水稻品种间差异不明显,对浸种温度高度敏感。该试验提出了一种无损的水分检测方法,能够更加直接准确的揭示水稻种子在浸泡过程中的水分变化规律,为探求种子的最佳浸泡条件提供数据支持和理论依据。  相似文献   

Fumonisin mycotoxins in traditional Xhosa maize beer in South Africa     

Shephard GS  van der Westhuizen L  Gatyeni PM  Somdyala NI  Burger HM  Marasas WF 《Journal of agricultural and food chemistry》2005,53(24):9634-9637

The production and consumption of home-brewed Xhosa maize beer is a widespread traditional practice in the former Transkei region of South Africa. HPLC determination of fumonisins B1 (FB1), B2 (FB2), and B3 (FB3) in maize beer samples collected in two magisterial areas, Centane and Bizana, showed a wide range of levels. All samples were positive for FB(1), with a mean level of 281 +/- 262 ng/mL and a range from 38 to 1066 ng/mL. Total fumonisins (FB1 + FB2 + FB3) ranged from 43 to 1329 ng/mL, with a mean of 369 +/- 345 ng/mL. Data on the consumption of home-brewed beer are not available. On the basis of published data for the consumption of commercial beer in South Africa, the fumonisin exposure in these districts among the consumers of maize beer was found to be well above the provisional maximum tolerable daily intake of 2 mug/kg of body weight/day set by the Joint FAO/WHO Expert Committee on Food Additives.  相似文献   

利用低场核磁共振及其成像技术分析水稻浸种过程水分传递     

宋平  徐静  马贺男  王成  杨涛  李娜 《农业工程学报》2016,32(17):274-280

为研究水稻种子浸种过程中内部水分流动情况,可视化内部水分传递过程,利用低场核磁共振及其成像技术,监测沈农9816号、七山占及秀子糯3个品种水稻种子48 h浸种过程。每6 h时间间隔利用自旋回波（spin echo,SE）脉冲序列获取样品的质子密度加权像,利用硬脉冲自旋回波（carr-purcell-meiboomgill sequence,CPMG）序列获取样品的横向弛豫时间T2反演谱,从而分析浸种过程对水稻种子内部水分分布的影响。试验结果表明：核磁共振是一种有效的水分检测技术,可以实现浸种过程中种子内部水分的快速、准确、无损的检测。利用水稻种子的质子密度加权像,能够直观检测到种子内部水分分布情况,动态的监测到种子内部水分流动过程,分析发现水分最初是从胚进入种子内部,继而通过种皮的渗透,最后到达胚乳部分。根据T2反演谱信号幅值计算得到的水稻种子吸水率,发现3个品种在相同浸种时间的各个监测点均反映出秀子糯吸水率最高,沈农9816号吸水率最低,试验结果验证了支链淀粉的吸水性优于直链淀粉。研究结果可以为水稻种子浸种过程中水分传递的理论模型构建提供数据支持。  相似文献   

Associations between parental report of the home food environment and adolescent intakes of fruits, vegetables and dairy foods     

Hanson NI  Neumark-Sztainer D  Eisenberg ME  Story M  Wall M 《Public health nutrition》2005,8(1):77-85

OBJECTIVE: This study examines parental report of household food availability, parent dietary intake and associations with adolescent intakes of fruits, vegetables and dairy foods. DESIGN: Cross-sectional study. Adolescents completed the Project EAT survey and the Youth Adolescent Food Frequency Questionnaire at school. Parents of adolescents were interviewed by telephone about the home food environment, eating habits and weight-related behaviours. General linear modelling was used to compare dietary intakes of adolescents across different levels of household food availability and parental intakes. SUBJECTS/SETTING: The study sample included 902 adolescents and their parent or guardian. RESULTS: Many parents were not consuming the minimum number of daily recommended fruit (44.5%), vegetable (69.9%) or dairy (46.9%) servings. While most parents reported that fruits and vegetables were available at home (90.3%) and vegetables were usually served at dinner (87.0%), fewer parents reported milk was served at meals (66.6%). Soft drinks were usually available at home (56.8%). Among girls, household availability was positively associated with fruit and vegetable intake (ttrend=2.70, P<0.01) and soft drink availability was inversely associated with dairy intake (ttrend=2.08, P=0.04). Among boys, serving milk at meals was positively associated with dairy intake (ttrend=3.65, P<0.01). Parental intakes were positively associated with dairy intake for boys (ttrend=2.04, P=0.04), and with dairy (ttrend=2.43, P=0.01), vegetable (ttrend=3.72, P<0.01) and fruit (ttrend=3.17, P<0.01) intakes for girls. CONCLUSIONS/APPLICATIONS: Interventions designed to help adolescents improve consumption of fruits, vegetables and dairy foods may be enhanced by including a parental component aimed at increasing household availability and parents' intake of healthful food choices.  相似文献   

知识经济对大学生思想素质的新要求     

宋平 《郑州牧业工程高等专科学校学报》2000,20(2):135-136

知识经济作为一种经济运行模式 ,是“以智力资源的占有、配置、以科学技术为主的知识的生产、分配和使用 (消费 )为最主要因素的经济”。它给我们带来的不仅是科技和知识的革命 ,更重要的是它将引发一场深刻的生产方式和文化观念、社会观念的变革 ,促使人们价值取向 ,直至思维方式的改变 ,这种变革 ,不但为大学生的思想素质教育赋予新的内容 ,也向思想教育工作者提出了严峻的挑战。1　知识经济要求大学生具有浓厚的兴国情结和强烈的“大社会”责任感知识经济时代国与国之间的竞争 ,已形成以高科技为先导的综合国力的竞争 ,已经以占有物质资…  相似文献   

养猪的科学饲养管理     

牛鑫  宋平 《郑州牧业工程高等专科学校学报》2006,26(3):27-28

随着人民生活水平的不断提高,对肉、蛋、奶的需求量与日俱增,促进了畜牧养殖业的发展,加快了畜牧业产业化的过程,尤其是养猪业更有了较快的发展。养殖业发展规律本身就是呈“锯齿形”向前发展,既有高峰期又有低谷,目前养殖业已向低谷下滑。为了使养猪业走出低谷,长盛不衰,就要降低饲养成本,提高效益。养殖业是综合效益的累加,环节很多,应主要做好选择良种,饲喂全价饲料降低饲养成本,做好疫病防治,加强科学管理,搞好经营管理等。关键是依靠科技进步,提高单位质量,降低饲养成本,稳中求进,才能长盛不衰。现把本人在实际工作中总结的点滴经验,报…  相似文献   

鲢鳙线粒体DNA的九种限制性内切酶酶场图谱的比较     

宋平  李小迎  熊全沫 《水产学报》1994,18(3):221-230

以十一种限制性内切酶对鲢鱼ｍｔＤＮＡ进行单酶完全酶解的切点数：ＳａｌＩ和ＢｇｌⅡ为０；ＰｓｔＩ．ＸｈｏＩ．ＫｐｎＩ和ＳａｃＩ为１；ＨｐａＩ和ＸｂａＩ为２；ＢａｍＨＩ为３；ＢｇｌＩ和ＥｃｏＲＩ为４。以九种限制性内切酶对鳙鱼ｍｔＤＮＡ进行单酶完全酶解，其切点数；ＰｓｔＩ．ＸｈｏＩ．ＳａｌＩ．ＫｐｎＩ．ＢｇｌⅡ均为１；ＨＰａＩ和ＸｂａＩ为２；ＳａｃＩ为３；ＢｇｌＩ为４。采用琼脂糖凝胶电泳法测得鲢鱼ｍｔＤＮＡ分子量为１５９３０±２２０碱基对（ｂｐ）；鳙鱼ｍｔＤＮＡ分子量为１６６５０±１５０碱基对（ｂｐ）。用单、双酶解法和部份酶解法构建了鲢鱼九种酶１８个切点和鳙鱼九种酶１６个切点的限制性内切酶酶切图谱。另外，对这两种鱼的酶解位点数，片段大小和限制酶图谱进行了比较。  相似文献