吴杰,郭康权,顾蓉,张佳,漆楚生.库尔勒香梨不同膨压水平下的动态粘弹特性[J].农业机械学报,2010,41(9):113-117.
.on Dynamic Viscoelasticity of Korla Pear Tissue[J].Transactions of the Chinese Society for Agricultural Machinery,2010,41(9):113-117.
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库尔勒香梨不同膨压水平下的动态粘弹特性   [下载全文]
on Dynamic Viscoelasticity of Korla Pear Tissue   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:  库尔勒香梨  细胞膨压  动态粘弹特性
基金项目:
吴杰  郭康权  顾蓉  张佳  漆楚生
西北农林科技大学
中文摘要:对经过不同浓度蔗糖溶液渗透处理后具有高、低和正常3种膨压水平的库尔勒香梨果肉进行振荡剪切试验和蠕变试验,以考察膨压水平对香梨果肉组织粘弹特性的影响。结果表明,不同膨压香梨果肉在各频域内的储能模量(G′)均远大于损耗模量(G″),且变化都不受频率影响,但均随膨压提高呈增大趋势。同时,不同膨压香梨果肉的蠕变响应可采用六元件广义Kelvin-Voigt模型精确拟合,模型中的瞬时弹性柔量(J0)、延迟弹性柔量(J1和J2)和稳态粘性柔量(1/η0)均随着膨压下降而增大。果肉组织扫描电镜观察表明,各粘弹参数(G″、G′、J0、J1、J2、1/η0)的显著变化与膨压调控引起的细胞结构和胞间隙变化有直接关系。
Key Words:
Abstract:Viscoelastic properties of Korla pear (Pyrus bretschneideri rehd) tissue osmotically treated in iso-, hypo- or hypertonic sucrose solutions were investigated using oscillatory shear and creep-recovery tests. Results indicate that storage moduli (G′) is much higher than loss moduli (G″) over the entire frequency range. Both G′ and G″ show frequent independent, but increase with the increasing of turgor. In creep testing, the creep compliance responses of low, normal and high turgor tissues were characterized by a generalized Kelvin-Voigt model with six elements. The instantaneous (J0), retarded compliance (J1 and J2) and steady state fluidity (1/η0) increased as turgor was reduced. By scanning electron microscopy (SEM), many rheological parameters (G″, G′, J0, J1, J2 and 1/η0) show the marked changes among the three turgor levels, which relates with the changes of cells and intercellular spaces due to the turgor manipulation.

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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