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阐述构成稻米品质的因素,以碾磨品质、外观品质、蒸煮食味品质和营养品质4个方面10项指标为基础,探讨品种遗传特性、栽培因素和环境因素对稻米品质的影响,旨在为今后提高水稻的稻米品质提供参考。 相似文献
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影响稻米品质的因素及对策 总被引:1,自引:0,他引:1
针对我国稻米生产重视产量而忽视品质的倾向,提出从高产向优质安全转变的观点.阐述稻米品质的概念、构成要素与优质标准,介绍目前水稻品种品质的现状,探讨品种遗传特性、环境、栽培条件等影响稻米品质的主要因素,并提出提高稻米品质的有效措施,以期为提高水稻的稻米品质提供参考. 相似文献
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稻米食用品质的力学指标主成分分析 总被引:7,自引:1,他引:6
采用主成分分析的方法,以米饭的力学指标为依据,评价稻米的食用品质.从样本相关矩阵出发,对稻米7个品系米饭的主要力学指标进行分析,根据累积贡献率达到80.8%以上,确定了反映稻米食用品质的2个主成分,并获得各品种的主成分得分值,进行了食用品质分析,其结果与实际相接近,表明应用主成分分析的方法利用米饭的力学指标评定稻米的食用品质具有准确性和可行性. 相似文献
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系统论述稻米碾磨品质、外观品质、蒸煮品质的遗传规律及特点,介绍分子标记辅助选择的原理、优越性及其在育种方面的应用开发现状,为改良我国稻米品质提供有益参考. 相似文献
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为了快速辨识不同味觉品质的牛肉汁,对牛肉味觉品质等级进行划分,构建了由12个离子电极与1个参比电极组成的味觉传感器阵列,将该阵列应用于牛肉汁的等级辨识中,评价30组牛肉汁样品味觉品质等级。采用基于欧氏距离的聚类分析方法划分牛肉味觉品质等级。针对牛肉汁味觉品质评价自动化关键技术问题,对用于牛肉汁等级评价的传感器阵列进行了筛选优化。采用单因素方差分析对各离子电极响应信号之间的内在关联进行了研究,根据优化结果选择S1、S2、S5、S7、P2、P3离子电极构建新的传感器阵列,并对30组牛肉汁进行评价。试验结果表明:优化后的传感器阵列对牛肉汁的等级评定正确率为93.33%,高于未经优化的传感器阵列的等级评定正确率(80.00%)。 相似文献
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基于计算机视觉的胡萝卜外观品质分级系统与装备 总被引:2,自引:0,他引:2
为了实现胡萝卜的自动化分级分选,在前期胡萝卜青头、须根、开裂检测算法研究的基础上,参照国家标准需求,进一步提出了胡萝卜外观等级规格,如弯曲、断折等缺陷,以及衡量异品种的锥形度参数的检测方法,并以此为基础设计了基于计算机视觉的胡萝卜外观品质实时分选生产线。该生产线由下位机控制系统、上位机软件系统和机械分级装置组成。通过对软硬件环境和机械系统性能的测试表明:该分选生产线每秒钟可检测20个胡萝卜的等级;对520个胡萝卜含有不同种类缺陷和异品种的胡萝卜进行分级检测,分级正确率达到了93.5%,能够满足胡萝卜外观品质分选实时检测的要求。该分选线能够同步实现胡萝卜等级规格、质量、各种缺陷的实时检测与在线分选。 相似文献
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对4个迷你黄瓜品种的外观品质和营养品质进行了测定.结果表明,迷你2号的外观品质最优,迷你1号的营养价值最高. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献