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An expert system for biomass soft-sensor hybrid modeling in fermentation process was decribed in this paper.A production rules representation based on database was presented.The definitions of production rules for biomass soft-sensor hybrid modeling knowledge were proposed.A knowledge base with layered structure was introduced.A breadth-first reasoning approach based on match degree(BFMD) was developed.The definition and calculation method of match degree were illustrated.Compared with the depth-first reaso... 相似文献
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本文研究一类平面五次系统极限环的唯二性。通过将其化为Abel方程,应用文献[1]中的定理3,给出一类平面五次多项式系统至多存在两个极限环的充分条件。 相似文献
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利用95%的乙醇对蜂胶润喉片中黄酮类化合物进行提取、采用分光光度法进行含量分析,蜂胶润喉片中黄酮类化合物的含量达0.68%.为保健品蜂胶润喉片的质量检测提供了一种切实有效的检测方法. 相似文献
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鄱阳湖圩区气候温和,年平均气温在17℃左右,雨量充沛,年降水总量在1500mm左右:成土母质为近代河湖沉积物,土层深厚、肥沃,宜种性广.目前圩区农业生产以水稻为主,兼有小面积的旱作果园等.查明圩区土壤在不同利用方式下土壤微生物区系的变化以及三大类群微生物(细菌、放线菌、真菌)在土壤中的分布规律,对于圩区土壤的利用、改良,提高土壤肥力有一定意义. 相似文献
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利用超高效液相色谱-串联质谱法(UPLC-MS/MS),建立桃中氟吡菌酰胺及其主要代谢产物2-(三氟甲基)苯甲酰胺(BZM)和肟菌酯及其主要代谢产物肟菌酸的检测方法。去核粉碎后的桃样品经乙腈提取,C18吸附剂净化,UPLC-MS/MS分析,采用电喷雾正离子(ESI+)模式和多反应监测(MRM),外标法定量。结果显示,在0.005~0.1 mg/L范围内,4种目标化合物的质量浓度与信号响应的峰面积均线性关系良好,相关系数(r)均大于0.99。在0.01, 0.1, 1, 3 mg/kg的添加水平下,4种目标化合物的平均回收率为77.7%~108.0%,相对标准偏差(RSD)为3.1%~17%。4种目标化合物的定量限(LOQ)均为0.01 mg/kg。该方法符合农药残留分析要求。 相似文献
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Neck linker (NL) is one of the most important mechanical elements of kinesin motors. The zipping up process of the neck-zipper (NZ) formed by NL and the related secondary structure elements is one of the major parts of kinesin's power stroke. All the weak interactions that are responsible for the formation of NZ are sensitive to or dependent on water. To investigate the role of water in the NZ region, a molecular dynamics (MD) model is set up with a crystal structure of kinesin 2KIN surrounded by a 10 A water layer, and minimization is performed to determine the positions of hydrogen atoms and other atoms. It is revealed that water molecules can assist the docking process of NL by forming hydrogen bonds at those positions where direct hydrogen bonding between the two sides of NZ is hindered and then acts as a constructive component of NZ at the docked state of NL. This result may improve the understanding of the mechanism for the docking of NL of kinesin wherein the function of water has not been comprehended sufficiently. 相似文献
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基于演化博弈论,围绕如何在车辆路径选择中提高诱导信息有效性和诱导效率等问题展开了研究。通过建立无诱导信息条件下的路网模型和建立诱导信息模型,研究不同初始条件对驾驶员的作用规律;通过拓展无诱导信息条件下的车辆路径选择的模型,设计了结合八邻域摩尔模型和公共物品博弈模型的驾驶员群体策略演化机制,提高了诱导信息有效性和诱导效率。 相似文献