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Some physical properties of sugarbeet seed 总被引:1,自引:0,他引:1
Various physical properties of sugarbeet seed were determined as a function of moisture content. The lengths of the major, medium and minor axes varied from 4.61 to 5.30, 3.82 to 4.36 and 2.20 to 2.38 mm, respectively, as the moisture content increased from 8.4 to 14.0% d.b. In the same moisture range, the arithmetic and geometric mean diameters increased from 3.54 to 4.02 and 3.38 to 3.80 mm, respectively. Studies on rewetted sugarbeet seed showed that the sphericity decreased from 0.734 to 0.717, whereas thousand seed mass and projected area increased from 12.60 to 13.41 g and 12.1 to 15.6 mm2, respectively, with increase in moisture content from 8.4 to 14.0% d.b. The bulk density, true density and porosity decreased from 447 to 418 kg m−3, 962 to 851 kg m−3 and 53.6 to 50.9%, whereas terminal velocity and angle of repose increased from 5.6 to 6.6 ms−1 and 17.6 to 25.0°, respectively, as the moisture content increased from 8.39 to 14.00% d.b. The static coefficient of friction increased on four structural surfaces namely, rubber (0.687-0.790), plywood (0.480-0.608), galvanised metal (0.392-0.434) and aluminium (0.279-0.388) in the moisture range from 8.4 to 14.0% d.b. 相似文献
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Rama Chandra Pradhan Satya Narayan Naik Lope Tabil 《International Journal of Food Properties》2013,16(4):732-743
The average flaxseed length, width, thickness and 1000 seed mass were 4.64 mm, 2.37 mm, 1.0 mm and 5.77 g, respectively. The average surface area was 15.49 mm2 while the sphericity and aspect ratio were 0.48 and 51.04%, respectively. The average bulk density was 652.16 kg/m3 while the true density was 784.36 kg/m3, and the corresponding porosity was 16.83%. The angle of repose for flaxseed was 24.40 while the terminal velocity was 2.9 m/s. The results showed that the mean value of static coefficient friction was least in case of plastic sheet while it is highest for rubber sheet. 相似文献
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低取代度醋酸酯淀粉的特性及其合成工艺 总被引:5,自引:1,他引:5
本文介绍了醋酸酯淀粉的主要物化性质及其黏度稳定性和吸湿性,以精白红薯淀粉为原料,研究制备醋酸酯淀粉的最佳反应条件为:m(淀粉):m(醋酸酐)=16:1,反应温度25~30℃,反应pH值8.0~8.4,反应时间为1h. 相似文献
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Physical properties of sweet corn kernels have been evaluated as a function of kernel moisture content, varying from 9.12 to 17.06% (db). In the moisture range, kernel length, width, thickness, and geometric mean diameter increased linearly from 9.87 to11.09 mm, 7.41 to 9.25 mm, 3.25 to 4.37 mm, and 6.18 to 7.62 mm, respectively, with increase in moisture content from 9.12–17.06%. The sphericity index, kernel volume, kernel surface area, and thousand seed weight increased linearly from 62.6 to 68.8, 93.8 to 194.3 mm3, 120.1 to 182.9 mm2, and 220 to 268 gr, respectively. Apparent density and bulk density decreased linearly from 1.315 to 1.232 g/cm3 and 0.765 to 0.698 g/cm3, respectively, while bulk porosity increased from 41.8 to 43.3%. The highest static coefficient of friction was found on the plywood surface. The static coefficient of friction increased from 0.680 to 0.891, 0.605 to 0.741, and 0.530 to 0.644 for plywood, galvanized iron, and aluminum surfaces, respectively. The angle of repose increased linearly from 30.2 to 35.2° with the increase of moisture content. 相似文献
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季节交替引起温度、相对湿度的变化,从而对车间温湿度产生影响.为保证涤棉细号高密品种浆纱质量,针对一年当中几个特殊时期--高温高湿期、低温高湿期及高温与低温之间的过渡期调整浆纱工艺:主浆料PVA的用量浮动4 kg,上浆率浮动1%~2%,浆纱回潮率浮动0.5%~1.0%,针对G142C型浆纱机压浆力低、车速低的情况配以中粘度型浆液进行上浆,使浆液浸透与被覆取得较好效果. 相似文献
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Ahmed Kayacier 《LWT》2004,37(2):275-281
Fick's law of diffusion and an empirical model were used to describe moisture transport in tortilla chips during baking. An empirical model based on regression of moisture content in terms of baking time and temperature slightly over predicted the moisture content of samples. There was a good agreement (R2=0.93) between experimental results and predicted values with the empirical model. The model based on effective diffusivity approach also predicted the moisture content fairly good. Both liquid and vapor diffusion was effective in the transport of vapor. Liquid diffusion and vapor diffusion were dominant in the beginning and toward to end of baking, respectively. The average moisture diffusivity of samples was calculated using a nonlinear regression of moisture content data during baking. The range for the average effective diffusivity was 6.25×10−10-10.98×10−10 m2/s and the diffusivity coefficient increased with increasing temperature. There was an Arrhenius type relationship between effective diffusivity coefficient and baking temperature. 相似文献
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基于电特性的大豆含水率测量研究 总被引:1,自引:0,他引:1
为了对大豆含水率进行快速无损测量,提出了利用大豆电特性进行含水率测量的原理及装置。由大豆介质套筒式电容器、信号发生器、信号测量仪组成了检测装置,研究不同测试频率时大豆的介电特性(等效电容、损耗角正切、等效电阻)与含水率的关系。研究表明:合适的测试频率为1kHz;经单纯形法拟合,等效电容与含水率呈幂函数关系。为大豆含水率的快速测试提供了一种新方法。 相似文献
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赣南02—70是桂糖69.435xCP84.1198的后代,通过有性杂交育种方法,采用五圃制进行选育。10年的研究结果表明,赣南02.70是一个特早熟高产高糖的甘蔗新品种,其农艺性状和工艺性状均表现优良。在省内区试中,公顷蔗茎产量达106200kg,比对照(赣蔗18号,下同)的90896kg增产16.84%;蔗糖分达15.05%,高于对照0.42%(绝对值);公顷含糖量达15980kg,比对照增糖20.15%;且改良了赣蔗18号难脱叶的性状,可降低收获成本,提高甘蔗生产效率,增加农民收入。 相似文献
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全国第二轮区试中亚热带甘蔗品比宿根试验总结 总被引:1,自引:0,他引:1
全国第二轮区试中亚热带蔗区甘蔗品比宿根试验结果表明:工农艺性状表现最好的是川蔗19号,其甘蔗产量和糖分及含糖量等超过了两对照;粤农89-525、闽糖90-55、粤糖89-240和C29的抗寒性、宿根性较强,发株率较高,有效茎较多,故其甘蔗产量和含糖量等位居第二、第三、第四和第五;福农91-23的前期生长快,大生长期生长量大,8月份生长量高达70.5cm,其后期生长减慢,因而其株高仅次于川蔗19号,又其茎径较大,单株重最重,故其甘蔗产量和含糖量位居第六。 相似文献
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含水率影响着花生的质量、储藏时长与出油率。本研究针对当前花生含水率测量效率低、有损检测、无法适应大规模检测等问题,探索基于高光谱成像技术的花生含水率无损快速检测方法。测量并建立了300份不同种类花生的高光谱原始图像及光谱数据集,并利用小波变换、多元散射校正(MSC)和一阶导数对数据进行预处理,结合PLS、XGBoost、BO-XGBoost算法建立花生含水量无损检测模型。通过实验对比得出,利用小波变换对原始光谱数据进行预处理后的光谱数据建立的BO-XGBoost模型最优,预测模型决定系数R2=0.953 9,均方根误差RMSE=0.806 5。实验表明,高光谱成像技术结合BO-XGBoost能够对花生含水率进行快速、准确、无损检测,且对其他农作物水分含量检测具有一定的借鉴意义。 相似文献
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Okey Francis Obi 《International Journal of Food Properties》2016,19(10):2165-2174
In this study, the aerodynamic properties of three varieties of watermelon seeds as a function of moisture content were evaluated and modeled. The watermelon seed varieties used were Charleston grey, Kaolack, and Sugar baby, and their moisture content ranged from 8.61 to 24.26, 10.30 to 26.11, and 7.78 to 23.23% wet basis (wb), respectively. The results showed that the terminal velocity of the Charleston grey, Kaolack, and Sugar baby varieties increased from 5.27 to 6.67, 4.40 to 6.23, and 4.00 to 6.60 ms–1, respectively, as the moisture content increased. The Reynolds number of the three watermelon seed varieties increased with the increasing seed moisture content, while the drag coefficient generally decreased as the seed moisture content increased. Analysis of variance showed that the moisture content of the three watermelon seed varieties had significant effects on all the aerodynamics properties (p < 0.05). Mathematical models were developed to relate the moisture content of watermelon seeds with the values of the aerodynamic properties investigated. 相似文献
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Atef M. Elansari 《International Journal of Food Properties》2013,16(2):308-315
The thermal conductivity of four different types of meats (Veal, Hashi, Noeimi and Najdi) was determined for a temperature range of 5–40°C and moisture content range of 30–75% (wet basis). Thermal conductivity increased almost linearly with the increasing levels of both temperature and moisture content. Multiple regression models with high R2 < 0.91) values were developed to correlate thermal conductivity as a function of temperature and moisture content. Statistical analysis revealed that both variables had significant effect on thermal conductivity of meats. 相似文献
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Hermetical and traditional storage bags were evaluated for their effect on the postharvest storage of turmeric at laboratory conditions. The traditional Polypropylene (PP) woven bags and the jute bags were compared with Purdue Improved Crop Storage (PICS), Super Grainpro, Savegrain bags, and Ecotect bags. Every month, for eleven months, the levels of oxygen and carbon dioxide, moisture, insect damage, live insect count, weight loss of turmeric rhizomes were monitored. A slight change in moisture was observed for turmeric stored in PICS, Grainpro, Savegrain, and Ecotect bags. But, a significant decrease in moisture was observed for turmeric stored in jute bags. The levels of oxygen in PICS and Ecotect bags decreased from 20% to 8% while carbon dioxide content increased in PICS bags from 0.2% to 12% during the period of storage. In jute bags, the level of oxygen was approximately 19.3% but the level of carbon dioxide increased from 0.05% to 0.43% due to insect activity. In all hermetic bags, the risk of insects has decreased over time, and weight loss has also decreased as compared with jute bags. In Polypropylene woven and jute bags, damage by insects and weight loss increased during storage while the curcumin content reduced. Our study showed the effectiveness of PICS, Grainpro, Savegrain, and Ecotec bags in controlling insects and weightloss in turmeric rhizomes over the traditional bags. All the four hermetic bags performed well in long-term storage of turmeric rhizome and can be recommended. 相似文献
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Ultrasonic longitudinal attenuation and velocity have been measured for various frequencies between 0.5 and 13.5 MHz versus temperature, in honeys with moisture contents between 15% and 19%. With the help of attenuation measurements, the temperature of the alpha transition Tα (associated with the glass transition) has been deduced versus moisture content and ultrasonic frequency. Regarding the high sensitivity of Tα towards moisture content, one can distinguish two honeys with moisture contents difference less than 0.1%. Considering the fact that the experiments are not difficult to perform and are carried out at around room temperature, this technique could be useful for honey quality control or more generally for aqueous polymers study. 相似文献
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复烤片烟烟包真空降温技术的应用 总被引:1,自引:0,他引:1
为有效降低打叶复烤后的片烟烟包温度,提高复烤片烟的仓贮醇化质量及色香味品质,进行了烟包在线真空快速降温处理试验。结果表明,采用在线真空降温可快速降低复烤后片烟的烟包温度,有效排除烟叶表面的游离水分,避免包芯内部发生烟叶霉变等现象,有利于降低仓贮损耗,改善烟叶的醇化品质,提高片烟贮存的安全性。来料含水率控制在12.5%~13.0%;真空降温时间7~10min,可使复烤片烟的包芯温度从40℃左右快速降至32℃以下,烟包内各点的含水率极差≤0.35%,同时可降低预压打包工序的造碎率。 相似文献