共查询到19条相似文献,搜索用时 125 毫秒
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目前,测定麻株叶面积大小的描图法,重量法和求积仪法等方法,都存在着测定手续比较复杂,时间较长,一般不能在田间进行等缺点。我们综合了上述方法的优点,并根据麻株叶片大小与排水量的关系,试验了一种测定麻株叶面积的新方法——切片体积法。用这种方法来测定苎麻,红麻、黄麻植株的叶面积,使用仪器简单,操作方便,能在田间进行,且准确性较高。 相似文献
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研究CAN总线技术和汽车节气门,将CAN总线技术与汽车节气门相结合,设计出电子节气门,对汽车节气门的开度进行精确控制,进而优化汽车的空燃比,最终可提高汽车的动力性、经济性等汽车综合性能。 相似文献
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炒青初制机械化、提高了制茶工效,美中不足的是存在着松、扁、碎、烟焦味等缺点,其中烟焦味的茶叶不少,影响眉茶应有的传统特色。为了克服这个缺点,我们在春茶生产中进行了探讨,取得了较好的效果。春茶平均价每担比去年提高20元。产生 相似文献
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目前,测定麻株叶面积大小的描图法,重量法和求积仪法等方法,都存在着测定手续比较复杂,时间较长,一般不能在田间进行等缺点。我们综合了上述方法的优点,并根据麻株叶片大小与排水量的关系,试验了一种测定麻株叶面积的新方法——切片体积法。用这种方法来测定苎 相似文献
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不同秸秆还田模式对大豆根系分布的影响 总被引:2,自引:0,他引:2
对免耕、灭茬还田和传统耕作条件下大豆根系在土壤剖面中的垂直分布的变化规律进行了研究,为改善在保护性耕作条件下大豆根系发育条件提供参考。结果表明,免耕、灭茬还田和传统耕作模式的根长、根表面积、根体积及根干重均主要分布于土壤剖面0~10 cm深度。在0~10 cm深度内,不同耕作模式之间的根体积密度、根干重密度差异显著,其中免耕模式最低。在10~20 cm深度内,免耕模式根长密度、根表面积密度、根体积密度和根干重密度最低,其根长、根表面积、根体积和根干重占土壤剖面比例最低。土壤剖面根长、根表面积、根体积和根干重累加值亦表现为免耕最低,灭茬还田与传统耕作差异不显著。灭茬还田模式的根长密度、根表面积密度、根体积密度及根干重密度与传统耕作差异不显著,同时其根长、根表面积、根体积及根干重的垂直分布与传统耕作间差异亦不显著。土壤机械阻力和根长密度、根表面积密度、根体积密度及根干重密度呈显著负相关,土壤机械阻力是限制免耕模式大豆根系发育的重要因素。 相似文献
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我国农作物秸秆综合利用现状及其技术进展 总被引:11,自引:0,他引:11
我国秸秆资源丰富,但胡乱丢弃、吞控焚烧、直接还田和加工粗饲料等传统的处理方式存在着“三低一重”的缺点,即秸秆利用率低、转化率低、经济效益低、环境污染严重。介绍了秸秆综合利用技术的最新进展,包括腐熟还田技术、饲料转化技术、能源化技术及秸秆在工业上的各种应用。认为农作物秸秆的综合利用是保护生态环境、节约可再生资源的需要,也是缓解农村饲料、肥料、燃料和工业原料的紧张状况、促进农业可持续发展的要求。 相似文献
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通过研究温差发电技术,将其与轻度混合动力汽车有机结合,对轻度混合动力汽车电源系统进行优化设计,为混合动力汽车提供能源。与传统混合动力汽车比较,达到了节能与环保。 相似文献
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国际贸易是经济增长的影响因素之一,作为国际贸易一部分的出口贸易对于经济增长的作用,目前还处于讨论之中。本文从我国汽车出口贸易发展现状出发,研究汽车出口贸易与经济增长之间的相互关系,探讨汽车出口贸易对经济增长所产生的作用,并在此基础上提出促进我国汽车出口贸易发展的对策和建议。 相似文献
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Stephen J. Chapman Steven J. Mulvaney Rangan Chinnaswamy Patricia Rayas-Duarte Bo Allvin 《Journal of Cereal Science》2012
Despite the great variety of physicochemical and rheological tests available for measuring wheat flour, dough and gluten quality, the US wheat marketing system still relies primarily on wheat kernel hardness and growing season to categorize cultivars. To better understand and differentiate wheat cultivars of the same class, the tensile strength, and stress relaxation behavior of gluten from 15 wheat cultivars was measured and compared to other available physicochemical parameters, including but not limited to protein content, glutenin macropolymer content (GMP) and bread loaf volume. In addition, a novel gluten compression–relaxation (Gluten CORE) instrument was used to measure the degree of elastic recovery of gluten for 15 common US wheat cultivars. Gluten strength ranged from 0.04 to 0.43 N at 500% extension, while the degree of recovery ranged from 5 to 78%. Measuring gluten strength clearly differentiated cultivars within a wheat class; nonetheless it was not a good predictor of baking quality on its own in terms of bread volume. Gluten strength was highly correlated with mixograph mixing times (r = 0.879) and degree of recovery (r = 0.855), suggesting that dough development time was influenced by gluten strength and that the CORE instrument was a suitable alternative to tensile testing, since it is less time intensive and less laborious to use. 相似文献
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分析互联网对汽车营销的现状,提出汽车技术服务与营销专业教学应激发学生兴趣,引导连接行为,培养积极心态,挖掘学生优点,培养自信等教学启发,使学生不但掌握专业知识,而且培养互联网思维。 相似文献
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In this study, we present the application of a hybrid neuro-fuzzy system for the prediction of cotton rotor spun yarn strength
from cotton fiber properties. The proposed system possesses the advantages of both artificial neural networks and fuzzy logic,
and is thus more intelligent. HVI (high volume instrument) and Uster AFIS (advanced fiber information system) fiber test results
are used to train the neuro-fuzzy inference system. We also study the degree of impact of each fiber property on the rotor
spun yarn strength. Fiber strength, upper half mean length, length uniformity and yarn count have a positive impact whereas
micronaire, yellowness and short fiber content have a negative impact on rotor spun yarn strength. 相似文献
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为建立固相萃取-气相色谱法测定香蕉中多种残留有机磷农药敌敌畏、乐果、毒死蜱、辛硫磷、丙溴磷的方法,采用氮磷检测器(NPD)气相色谱法对经无水丙酮提取、Na2SO4脱水、固相萃取净化、氮吹仪浓缩后,用丙酮定容的样品进行测定。结果显示,敌敌畏、乐果、毒死蜱、辛硫磷、丙溴磷的最低检出浓度分别为0.010、0.008、0.012、0.002、0.008 mg/kg,加标回收率在78.82%~101.5%,相对标准偏差为3.7%~6.2%。表明该方法线性良好,回收率、精密度好,灵敏度高,符合检测要求,可用于香蕉中多种残留有机磷农药的测定。 相似文献
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A new method for rotor spun yarn prediction from fiber properties based on the theory of support vector machines (SVM) was
introduced. The SVM represents a new approach to supervised pattern classification and has been successfully applied to a
wide range of pattern recognition problems. In this study, high volume instrument (HVI) and advanced fiber information system
(Uster AFIS) fiber test results consisting of different fiber properties are used to predict the rotor spun yarn strength.
The results obtained through this study indicated that the SVM method would become a powerful tool for predicting rotor spun
yarn strength. The relative importance of each fiber property on the rotor spun yarn strength is also expected. The study
shows also that the combination of SVM parameters and optimal search method chosen in the model development played an important
role in better performance of the model. The predictive performances are estimated and compared to those provided by ANFIS
model. 相似文献
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MATLAB是一种影响大、流行广的科学计算语言,MATLAB的图形用户界面开发环境(GUIDE)支持外部ActiveX控件的使用,利用这一功能可以极大地扩展MATLAB界面设计的灵活性。将MATLAB GUI中的ActiveX控件应用于汽车仪表盘设计,探讨ActiveX控件的使用方法和用该方法设计汽车仪表盘的简便性和可行性。 相似文献