郭文川,陈克克.桃10~4500 MHz间的介电特性与内部品质关系分[J].农业机械学报,2010,41(3):134-138.
.between Dielectric Properties from 10 to 4500 MHz and Internal Quality of Peaches[J].Transactions of the Chinese Society for Agricultural Machinery,2010,41(3):134-138.
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桃10~4500 MHz间的介电特性与内部品质关系分   [下载全文]
between Dielectric Properties from 10 to 4500 MHz and Internal Quality of Peaches   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:    品质  可溶性固形物  含水率  介电特性
基金项目:
郭文川  陈克克
西北农林科技大学
中文摘要:以不同成熟度的银风桃为对象,利用同轴探头技术测量了25℃下10~4500MHz间桃肉和桃汁的介电参数,并测量了桃肉的含水率、桃汁的可溶性固形物含量、pH值和电导率,分析了介电特性和内部品质间的关系。结果表明,桃肉和桃汁的相对介电常数皆随着频率的增大单调减小,而介质损耗因数呈现“V”型的变化趋势。离子的导电性和偶极子的极化分别是引起低频和高频下介电损耗的主要原因。桃肉和桃汁的介电参数与可溶性固形物含量、pH值以及含水率间没有明显的线性关系。
Key Words:
Abstract: In order to explore the potential of dielectric properties in determining fruit internal quality, peaches with different maturities were selected and coaxial open-ended probe technology was used to measure permittivity of peach pulp and juice over the frequency range from 10 to 4500 MHz at 25℃. The moisture content of peach pulp, soluble solids content, pH value and electrical conductivity of juice were also measured. The results showed that the dielectric constants of pulp and juice decreased with increased frequency, while the loss factors changed with “V” type. The ionic conduction and dipolar polarization were the major loss mechanisms at lower frequencies and higher frequencies, respectively. The relationship between permittivity and soluble solids content, pH value, and moisture content was non-linear.

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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