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1.
多年来,快速、准确地测定粮油水分,已成为粮食收储企业的一大难题,然而,以电子技术为核心的第三次技术革命,也被引进了粮食企业,pm-888型电容式谷物水分测定仪,被佳木斯前进国家粮食储备库所采用,从而提高了粮食水份检测的准确度和工作效率。  相似文献   

2.
粮食水分快速检测技术综合评述   总被引:22,自引:0,他引:22  
水分含量是粮食的一项主要质量指标,其快速,准确测定具有重要意义。本文探讨了国内外现有的粮食水分快速检测方法,分析了各类水分快速测定仪器的特点与局限性,提出了粮食水分快速检测技术的发展方向。  相似文献   

3.
介绍了粮食水分检测系统在我库的应用情况,实践证明该技术具有快速检测粮食水分,帮助准确掌握粮情,提高仓储管理水平的优点,值得在储粮行业推广应用。  相似文献   

4.
阐述国内现有的各种粮食水分的测量方法、原理及其测量特性,对常用的粮食水分测量仪器及其主要性能指标进行了分析,并对测试误差进行了分析探讨,为从事粮食水分研究和相关人员提供了理论依据。  相似文献   

5.
基于微波的粮食水分检测密度无关算法   总被引:1,自引:0,他引:1  
在使用微波法测量粮食水分的过程中,传统算法往往需考虑粮食密度对水分测量值的影响。然而在线检测粮食密度较为困难,因此相应加大了水分测量的难度。为了提高粮食水分检测中的测量精度,消除粮食密度对水分测量值的影响,提出了一种基于微波透射法的粮食水分检测密度无关算法。本算法引入密度不相关算子,测量值密度无关的同时,该算法可以作为标准补偿算法,适用于不同种类粮食的水分在线检测,保证了水分检测的准确性。  相似文献   

6.
粮食水分快速测定仪是粮食质量检验的主要工具 ,提高其准确性与重复性具有重要意义。文章分析了粮食水分采样结果的统计特性 ,建立了粮食水分快速测定随机过程的数学模型 ,提出了以多次采样算术平均值为仪器测量结果示值的测量结果表示方法 ,确定了采样次数。在此基础上研制的粮食水分快速测定仪具有测量准确、重复性好等特点 ,已在我国粮油行业普及使用  相似文献   

7.
《粮食与油脂》2017,(8):1-3
简要介绍了近年来粮食储藏过程中水分、温度、微生物、虫害、气体成分的快速检测方法,分析了各种方法的优缺点及其在粮库实际管理中的应用情况,为各级粮食工作者以及相关学者提供参考。  相似文献   

8.
粮食品质的检测 ,水分是必不可少的项目。在粮食收购中 ,水分是检测工作量最多的项目之一。因此快速水分检测仪成为粮食检测工作中必不可少的工具。其准确性、稳定性必须可靠无误。目前使用的国内生产的快速水分检测仪 ,从工作原理上分 ,主要有电阻式、电容式等 ,但由于技术设计的原因 ,都不同程度的存在误差大、稳定性不好的问题。在粮食收购工作中 ,快速水分检测数据仅作参考 ,不能作为判定的依据。影响了入库粮食质量和收购进度。针对快速水分检测仪存在的问题 ,特提出改进设计的思路。1 影响粮食水分测量的主要因素1.1 样品重量即测量…  相似文献   

9.
人工智能技术在解决传统农业难题方面表现出了无可比拟的优势。目前,粮食收购中对高水分玉米的水分含量和等级判定仍然以人工感官检测为主,存在工作量大、效率低、重复性差、主观性强等问题,影响企业效益和农民利益。针对玉米高水分快速检测的技术难题,采用机器视觉技术在挖掘玉米图像丰富信息的基础上,以互信息熵为耦合程度作为评价指标,研究了高水分玉米图像快速无损检测新方法及智能收购定等系统,并对系统进行了测试。结果表明,在实现“机器看水”仿生智能算法的基础上,进行高水分玉米收购定等是一条值得探索的技术路径。  相似文献   

10.
杭东 《面粉通讯》2012,(1):16-17
粮食在收购、存储、运输和加工的过程中,水分的检测和控制非常重要,现对目前的粮食水分检测方案进行收集和综合分析,并系统地阐述了国內现有的各种粮食水分的测量的常用方法、原理及其测量特性。  相似文献   

11.
 对纤维施加幅值固定、频率变化的激励信号时 ,其阻抗随着频率的增加 ,先迅速降低 ,超过某一频率后又迅速升高 ,谓之交流导电“浴盆效应”现象 ,利用此特性可设计交流阻抗法纤维回潮率快速测试系统 ,以克服传统电阻法测试纤维水分时“测量误差大”和“极板易极化”等缺陷 ,为设计开发新型纤维水分快速测试仪提供理论依据。  相似文献   

12.
采用圆球导热法测定了稻谷、小麦、玉米和大豆的导热系数,并对稳态时间、装样均匀性和水分迁移等影响试验准确性的因素进行了分析.结果表明,该方法测定粮食导热系数的稳定时间至少需要8~10h,通过内外球壁多个热电偶的电势差能确保装样均匀,水分含量分别为10.9%、10.1%、11.0%、6.9%的稻谷、小麦、玉米和大豆的导热系数分别为0.105 4、0.141 8、0.136 2、0.127 4 W/(m·℃),水分迁移对低水分粮食导热系数测定结果的影响可以忽略.  相似文献   

13.
滕召胜  周光俊 《中国油脂》1999,24(1):40-41,50
在研究油脂的水分-阻抗特性和温度-阻抗特性的基础上,设计了一种智能油脂水分快速测量仪器可望解决我国油脂现场水分快速,准确测量的难题。  相似文献   

14.
目的 开发一种基于微带微波传感器的谷物含水率便携式测量装置。方法 该装置由微波电路模块和实时测量模块组成, 可实时显示含水率测量结果。选择水稻样品的厚度和环境温度来优化设备参数。采用随机森林、决策树、K-最近邻和支持向量机4种算法预测水稻的含水率。结果 选择微波衰减、相移和温度作为随机森林算法模型的输入时, 预测结果显示出最好的准确性和稳定性, 最大平均绝对误差为0.55%, 最大标准偏差为0.41%。结论 该仪器结构简单、操作方便、成本低。有望为其他农产品的实时测量提供重要参考, 对智能农业装备的发展具有重要意义。  相似文献   

15.
Increasing energy costs have stressed the importance of calculation of heat and mass transfer in a grain bulk in order to be able to optimize drying facilities. Therefore values for the thermal conductivity and diffusivity of grain and especially shelled corn were determined. The investigations were carried out for single kernels as well as for grain and corn in bulk. Thermal conductivity and diffusivity were found to be mainly dependent on moisture content. Regression analyses showed a good correlation between moisture content and thermal conductivity or diffusivity, respectively.  相似文献   

16.
The viscoelastic properties of individual rice grains were measured by using a novel oscillatory squeezing instrument. Specifically, rice grains at different moisture contents and cooking durations were chosen as the model grain, and their viscoelastic characteristics, namely viscous modulus and elastic modulus, were determined. During the measurement, the grains were squeezed between a rigid bottom plate and a top round element oscillating at random frequencies in the range of 10–30,000 rad/s. The mechanical impedance of the rice samples, defined as the ratio between the force applied to the samples and the oscillation velocity, was obtained and used to calculate viscoelastic parameters. Measurements with the grains having moisture content between 12.8 and 29.1% indicated that both viscous and elastic moduli of the samples decreased significantly with increasing moisture content. The measured mechanical impedances of the samples showed that changes in viscoelastic properties for various cooking periods can be also monitored using the proposed oscillatory squeezing method.

PRACTICAL APPLICATIONS


In this study, a method for measuring viscoelastic properties of individual rice grain is presented. The technique is simple and easy to use. It can generate data for both elastic and viscous modulus properties for a single grain. There may be various practical applications for this instrument, such as textural characterization of grains having various chemical compositions and effect of cooking parameters on texture. The presented method can be also used to obtain textural differences between different varieties.  相似文献   

17.
When we speak about capacitance moisture meters for bulk materials we have to face with different values of dielectric permittivity for different bulk materials in dehydrated state, what causes a method error that can be named ‘type uncertainty’. Besides, different varieties of the same material have different values of dielectric permittivity, which depend from geographical origin, processing conditions etc. It can be hardly predicted automatically and type uncertainty can be compensated only in separate situations with the help of preliminary calibration. Main tasks of the research are to develop new comparison principle of moisture measurement with better accuracy due to effective compensation of physical, chemical and granulometric composition influence on the result of moisture measurement, develop new primary and secondary instrument transducers. Moisture sensor consists of four measuring capacitors. Two of them should be filled with a sample, which moisture content should be determined, and other pair of measuring capacitors should be filled with a same substance, but previously dehydrated. Mathematical models, developed to take into account granulometric composition of a bulk material were used to carry out a comparison analysis for three types of instrument measuring transducers. Obtained results proved that suggested principle of moisture measurement provides effective compensation of granulometric composition influence. Developed measuring principle had been experimentally tested what helped to confirm that it provides two times better compensation of different physical and chemical composition for different materials in comparison with the direct comparison method.  相似文献   

18.
Pitting is a premilling operation in which pigeon pea grain is passed through a dehulling machine quickly to crack the hull or partly dehull the grain. A study was conducted to investigate the effect of grain moisture content on pigeon pea hull during pitting. Pitting of the grain was done at 6%, 8%, 10%, 12%, and 14% moisture contents using dhal mill developed by Central Institute of Agricultural Engineering, Bhopal (India). Grains having a cracked hull or partly dehulled during pitting varied from 35.3% to 85.3% with maximum value at 10% moisture content and reduced with an increase in moisture content. Maximum finished product in the form of dehulled whole (gota) and dehulled splits (dhal) was also obtained at 10% moisture content. Pitted grains of pigeon pea were treated with 0.28% cottonseed oil to study the effect of moisture content and pitting on dehulling efficiency, which was maximum (86.7%) at 10% moisture content.  相似文献   

19.
The work aimed at determination of electric properties of wheat grain in dependence on its variety, moisture, geometrical features of kernels and applied current frequency. Wheat grain of 4 Polish winter varieties: Korweta, Juma, Mikon and Kobra from harvest 2001 were used as the material for study. Grain was sized into 3 fractions: (1) > 2,8mm, (2) 2,5–2,8mm, and (3) 2,2–2,5mm. Basic geometrical features were determined for not sorted grain (control sample) and its three fractions by the use of digital image analysis. Electric properties of grain (at 11% and 15% moisture content) have been performed with the Hewlett Packard 4263B meter. Measurements of impedance, resistance, admittance, conductance, as well as equivalent parallel capacitance and equivalent series capacitance were made. Obtained results were subjected to statistical analysis with the use of Statistica? programme. Changes in electric properties of grain significantly depended on all of studied factors. Most of all significant correlations appeared between geometrical features and studied electric properties of grain of 15% moisture. Statistical analysis of the results proved significant linear correlations between electric properties of kernels and their length, perimeter and circularity coefficient RC2 at higher measurement frequencies.  相似文献   

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