DIELECTRIC PROPERTIES OF APPLE CULTIVARS AND CODLING MOTH LARVAE
DIELECTRIC PROPERTIES OF APPLE CULTIVARS AND CODLING MOTH LARVAE
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苹果品种和苹果蠹蛾幼虫的介电特性
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
L. Neven
中科院分区：
文献类型：
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作者：
J. N. Ikediala;Juming Tang;S. Drake;L. Neven
对4个苹果品种和苹果蠹蛾3龄、5龄幼虫的介电特性进行了研究。
在30 MHz和3000 MHz之间，5°C至55°C下，使用开放式同轴线探针技术测量。介电
苹果的常数随频率的增加而减小，随温度的升高而略有减小。介电损耗因子
在射频范围内随温度线性增加，但在微波频率下几乎恒定。
苹果的最小介电损耗因子在约915 MHz处观察到。介电常数和损耗因子没有
受品种、果肉切片或苹果成熟度的影响。苹果的硬度和可滴定酸度下降，
而可溶性固形物含量则因成熟而显著增加。但这些性质与
介电性能苹果蠹蛾幼虫的介电常数和介电损耗因子的变化规律相似
频率和温度对苹果的影响。三龄苹果蠹蛾的介电特性高于二龄苹果蠹蛾，
在无线电频率区域的五龄幼虫的那些。昆虫的介电常数和损耗因子都很高
在低于2450 MHz的频率下，苹果的温度高于苹果的温度，这表明在2450 MHz的频率下，
2450 MHz或更高的频率，苹果蠹蛾幼虫在苹果主机。
Dielectric properties of four apple cultivars and third and fifth instars codling moth (Cydia pomonella) were
measured between 30 MHz and 3000 MHz at 5°C to 55°C, using the open-ended coaxial-line probe technique. Dielectric
constant of apples decreased with frequency and decreased slightly with increasing temperature. The dielectric loss factor
increased linearly with temperature in the radio frequency range but was nearly constant at the microwave frequencies.
Minimum dielectric loss factor of apples was observed at about 915 MHz. Dielectric constant and loss factor were not
influenced by cultivar, pulp section or degree of ripeness of apples. Firmness and titratable acidity in apples decreased,
while soluble solids content increased significantly due to ripeness. But these properties were not correlated with the
dielectric properties. Dielectric constant and loss factor of codling moth larvae followed a similar pattern of variation
with frequency and temperature as for the apples. The dielectric properties of third instars codling moth were higher than
those of the fifth instars in the radio frequency region. Dielectric constant and loss factor of the insect were much higher
than that of the apples at frequencies lower than 2450 MHz, suggesting that differential heating may be untenable at
2450 MHz or higher frequency for codling moth larvae in the apple host.
影响因子：
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作者：
K. Foster;H. Schwan
通讯作者：
K. Foster;H. Schwan