共查询到19条相似文献，搜索用时 171 毫秒
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《科教文汇》2018,(6)
胡椒、辣子是人们需要的每日调味品,对健康有益。随着中国加入WTO,农产品出口量不断增加,辣椒需求量不断增加。辣椒干燥的工业化和机械化势在必行。热风干燥是一种简单、经济和廉价的干燥方法。本实验研究了辣椒的热风干燥特性。选取热风温度,风速和加载厚度作为辣椒干燥的影响因素,对辣椒进行干燥动力学测试,得到辣椒的干燥特性曲线。选择热风温度、风速、负荷厚度和干燥时间作为辣椒失水率的正交试验因子,找出影响辣椒失水率的主要因素和最佳组合因子。热风温度,风速和负荷厚度是影响因素。对辣椒干品质进行正交试验研究,分析其主次因素,显着性程度和最佳组合因素。通过二次回归设计,建立了辣椒失水率和干品质的回归方程,并对其意义进行了检验。试验结果表明辣椒的热风干燥特性,分析了各种影响因素对辣椒干燥的影响,得出了辣椒干燥工艺参数与失水率和干燥质量评价指标的最佳组合。分析了热风温度和风速对干燥质量和干燥失水率的影响,建立了回归数学模型。本文的实验研究和分析结果为今后进一步研究辣椒干燥技术打下了坚实的基础,为干燥机的设计提供了依据。 相似文献
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白蘑菇远红外干燥的研究 总被引：1，自引：0，他引：1
利用远红外干燥试验箱对杭州白蘑菇进行了单层干燥试验,综合考虑干燥速度及电耗,得出较佳的干燥过程参数(箱温 60℃,照距14 cm,箱内对流风速自然对流)及较佳的物料参数(料厚1～3mm,装载量4.5kg/m~3);并与热风对流干燥作了比较.最后分析了远红外干燥机理及其质热交换过程。 相似文献
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茭白微波干燥特性及数学模型的研究 总被引：4，自引：0，他引：4
对茭白进行微波干燥试验,得出其微波干燥的失水特性,在实验数据基础上,通过分析确定茭白微波干燥适用Page方程模型,并进行数学模型回归,建立了茭白微波干燥In(-InMR)-Int回归方程.模型拟合极好,利用此模型可以比较准确地预测茭自在微波干燥过程中各时刻的水分比和含水率. 相似文献
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本文进行了微波和脉冲磁场复合作用下鲜切哈密瓜的杀菌实验研究,考察了微波预处理,磁场强度,脉冲次数及初始茵落总数对杀菌效果的影响。研究结果表明：微波和脉冲磁场的复合处理可以有效杀死鲜切哈密瓜中的细菌,茵落总数的最大杀菌率可以达到99．9％;12s的微波预处理可以起到物料升温与一定的杀菌作用,为脉冲磁场下鲜切哈密瓜的杀菌创造了有利条件;当磁场强度为0．6T时,随着脉冲作用次数的增加,菌落总数先下降,后有所增加,其转折点为20;当脉冲数为10时,随着磁场强度的增加,茵落总数总体上呈下降的趋势;初始菌落总数的增加有利于微波杀菌效果的提高,但对脉冲磁场的杀菌效果影响较小。 相似文献
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综述了玉米芯中木聚糖提取工艺的研究现状。不同的研究结果表明,不同条件下玉米芯中木聚糖的提取率各有差异。多数情况下,传统的碱法提取和蒸煮法提取等工艺中,木聚糖的提取率在18％-28％之间;采用微波辅助法,木聚糖的提取率可达3％左右。比较微波辅助提取与常规法提取可以看出,两者的木聚糖提取率相差不大。但微波辅助能够大大缩短提取时间,降低提取温度,使木聚糖提取过程更容易。 相似文献
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保护层施工,必须待密封材料表面干燥后才能进行,以免影响密封材料的固化过程及损坏密封防水部位。保护层的施工应根据设计要求进行,设计无具体要求时,一般可采用密封材料稀释后作为涂料,加铺胎体增强材料。 相似文献
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In this paper, a system of thermodynamic relations governing the deformation of strain-rate sensitive elastic-plastic materials is developed. These relations are obtained by assuming that the deformation and entropy of the material are dependent on stress state and temperature, and on certain internal variables which are identified in this paper with dislocation densities, and the mobile fractions of each kind of dislocation. It is postulated (on the basis of physical arguments) that the densities and fractions are governed by certain evolutionary equations. An example is given of a material that derives from these evolutionary equations under quite simple assumptions. It is shown by numerical calculations that this material exhibits the main features observed experimentally in uniaxial stress tests of metals. 相似文献
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应用微波热灼机对５６例患牙进行根管热灼消毒，结果表明，采用微波热灼消毒的实验组和使用传统方法治疗的对照组二组疗效经统计学处理Ｐ〉０．０５，无显著差异。说明微波热灼消毒完全可取代传统方法的药物消毒，并且可使疗程大大缩短。 相似文献
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John D. Ball 《Journal of The Franklin Institute》1928,206(2):181-200
In this investigation the first series of tests consisted of obtaining zero flux in two varieties of steel from various maximum flux values and by three different methods. B-H curves were obtained after demagnetization by the three methods and from the maximum value of these B-H curves hysteresis loops were taken.One method of demagnetizing was that suggested by the U. S. Bureau of Standards, which consists of current reversals through a magnetizing winding, in which current values are gradually reduced to zero. The second method consisted of applying a negative current of such an amount that the resultant value of flux would be such that when the current was released the flux value would go to zero. The third method was substantially the same as the second except the zero flux was approached from the direction of opposite polarity.The resultant B-H curves proved to be different from each other and to depend upon not only their origin but the previous history of the material as regards methods of demagnetization.The areas between the curves were evaluated.It was found that in cases of two of the three typical B-H curves the B-log H curves gave straight lines for part of the range involved.A second series of tests consisted of taking a set of hysteresis loops and repeating the determinations, using a greater number of steps to find if by taking a greater number of steps there might be a greater indicated energy loss. The results of this group of tests were not sufficiently definite to warrant conclusions. 相似文献
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切片土豆干燥中传质过程模拟与分析 总被引：2，自引：0，他引：2
建立切片土豆内部传质模型，内部传热模型来研究土豆干燥过程的传质模拟，并进行了实验验证，验证结果表明：用整个物料平均水分来间接验证，模拟值和实测值十分接近，二者的最大相对偏差小于9．1％，模拟结果表明：土豆片表层水分在热风的作用下得到蒸发，水分下降很快，在表内水分差作用下内部水分向表层迁移，干燥过程中产生表低内高水分分布规律。 相似文献