马海军,宋长冰,张继澍,张玮,胡芳.电激励信号频率对红点病苹果采后电学特性影响[J].农业机械学报,2009,40(10):97-101.
.Frequency of Electric Excitation Signal on Dielectric Property of Fuji Apples with Red-dot Disease[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(10):97-101.
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电激励信号频率对红点病苹果采后电学特性影响   [下载全文]
Frequency of Electric Excitation Signal on Dielectric Property of Fuji Apples with Red-dot Disease   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:  苹果  红点病  电特性  激励信号  频率
基金项目:
马海军  宋长冰  张继澍  张玮  胡芳
西北农林科技大学
中文摘要:研究了红点病富士苹果采后果实电特性的变化规律,为从电特性角度揭示红点病病害发病的内在机制提供理论参考。运用LCR电子测量仪测定了20℃恒温条件下贮藏70 d的红点病果实在100 Hz、1 kHz、10 kHz、100 kHz和1?MHz频率下复阻抗等电学参数。结果表明,在同一贮藏时间下,随着频率的增加,不论是病果还是正常果其果实的介电常数ε′、复阻抗Z、电抗X和电感Lp值均在减小;果实的Z、X和Lp间存在着显著相关;对100 Hz下以及1、10、100 kHz和1 MHz的病果和正常果的Z、X和Lp进行方差分析结果显示,两者差异均不显著(P>0.05),但两者在ε′和损耗因子tanδ上有明显差异(P<0.05)。tanδ和ε′基本可以反映水果的实际品质。
Key Words:
Abstract:The change of dielectric properties on Fuji apples with red-dot disease stored at constant temperature was investigated, which provides a new theoretical basis for revealing its pathogenetic mechanism at electrical properties. By applying LCR electronic measure instrument, the fruits’ dielectric properties, which include the impedance, reactance and inductance, were determined at 100 Hz, 1, 10, 100 kHz and 1 MHz at 20℃. The results indicated that the dielectric constant, impedance, reactance and inductance for all fruits decrease with the increase of frequency at the same stored days. Moreover, there was a significantly positive correlation among impedance、reactance and inductance, the value of the loss tangent and dielectric constant is significantly different (P<0.05), but the value of the impedance, reactance and inductance is not significantly different (P>0.05) between the diseased and normal fruits from 100?Hz to 1 MHz. This research revealed that the loss tangent and dielectric constant could reflect the quality of apples in some extent. 

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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