快速水分测定仪检测玉米水分的试验研究

恒重法测水分时间长、工效低，不能满足实际工作需要。使用LDS－1H型电脑水分测定仪速度快，但若操作不当，对测定结果影响很大，通过分析检测玉米干燥机出机粮食水分的实践过程和数据，总结快速水分检测仪准确检测粮食水分的注意事项。     

6种常用饲料原料平衡水分吸附等温线研究

通过研究6种常用饲料原料（小麦粉、米糠、棉粕、芝麻粕、玉米蛋白粉、DDGS）的平衡水分吸附等温线，评价了修正Halsey（MHAE）、修正 Henderson（MHE）、修正Chung-Pfost（MCPE）、修正3参数GAB（MGAB）、修正Oswin（MOE）等5种农产品常用的吸湿方程对这几种饲料原料平衡水分吸附等温线的拟合效果，发现小麦粉平衡水分吸附等温线：MGAB方程在15、35℃时拟合效果最好，MHE方程在25℃时拟合最好；米糠平衡水分吸附等温线： MOE方程在15、25、35℃时拟合效果均为最好；棉粕平衡水分吸附等温线：MOE方程在15、25℃时拟合效果最好，MGAB方程在35℃时拟合最好；芝麻粕平衡水分吸附等温线：MOE方程在15、35℃时拟合效果最好，MHAE方程在25℃时拟合最好；玉米蛋白粉平衡水分吸附等温线：MHE方程在15℃时拟合效果最好，MCPE方程在25℃时拟合最好，MOE方程在35℃时拟合最好；DDGS平衡水分吸附等温线：MGAB方程在15℃时拟合效果最好，MOE方程在25、35℃时拟合效果最好。并选择拟合最佳的方程计算出6种饲料原料的绝对安全水分和相对安全水分，以期为饲料贮藏和防霉工作提供数据指导。     

甜菜种子的水分及其检验

甜菜种子是甜菜生产重要的生产资料。种子的水分是指种子中所含有水分的重量占种子总重量的百分率。确切地说，是指按规定程序把种子样品烘干所失去的重量，用失去重量占供检样品重量的百分率表示。我国糖用甜菜种子行业标准QB1008—90规定甜菜种子含水率小于或等于14％，这一标准与国际规定的标准相同。种子的水分是保持种子生命活动的一种重要物质，甜菜种子含水量的多少直接关系到甜菜种子的品质、贮存、运输、使用等。近年来；我省甜菜种子质量下降，究其原因与甜菜种子含水量有关。夏季高温”、阴雨连绵，种子在收获时含水量较高，种…     

低温储藏稻谷品质变化及其指标差异性分析

采用15℃,12.4%、13.2%、14.0%、14.9%、17.0%稻谷五个水分梯度,对储藏140 d稻谷的水分含量、发芽率、降落数值、品尝评分、水分活度进行了分析,采用SPSS13.0统计软件对实验数据进行差异性分析,发芽率与水分活度存在显著的相关关系。分析结果表明稻谷在低温条件下,基本能实现安全储藏140 d。     

电阻式粮食水分含量的测定方法

电阻式水分测量方法因其具有结构简单、价格低廉的特点在粮食工业中得到了广泛应用。在传统电阻水分测量方法的基础上，本文介绍了几种典型的用于粮食工业中的电阻式水分测量方案，并对各种方案的特点进行了分析。     

浅谈pm—888型水分测定仪在应用中的点滴体会

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。     

果胶水分含量的快速测定

介绍了采用水分快速测定仪测定豆腐柴果胶粉的水分含量的方法,确定了最佳测定条件为:试验试样质量1.5g,加热电压220V,加热时间6min。该法具有操作简便、快速、准确的特点,可及时指导生产。     

果胶水分含量的快速测定

介绍了采用水分快速测定仪测定豆腐柴果胶粉的水分含量的方法，确定了最佳测定条件为：试验试样质量1．5g，加热电压220V，加热时间6min。该法具有操作简便、快速、准确的特点，可及时指导生产。     

快速粮食水分检测仪的改进设计

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…     

平衡相对湿度ERH原理在水分活度测量中的应用

目的:介绍目前市场上水分活度测量的主导产品和测量原理。方法:水分活度测量的平衡相对湿度ERH原理。结果:方法简单、操作方便,性价比高,测量准确±0.02。结论:ERH原理已成熟应用于水分活度的测量,产品在食品、生物、医药、卫生、检验检疫、烟草、造纸、园林等领域广泛应用。本文以瑞士ROTRONIC公司的水分活度仪为例,介绍目前市场上水分活度测量的主导产品和测量原理,以及水分活度在不同领域的应用。     

Moisture and sucrose transfer in fractionated palm kernel (PKO) based films immersed in liquid solutions

The effects of addition of sucrose, lecithin, and cellulose on unsteady state diffusivity and steady state permeability of moisture through fractionated palm kernel oil (PKO)-based films were studied under liquid-induced moisture migration at a water activity gradient of 1.0 and at a temperature of 25 °C. Addition of sucrose, cellulose, and lecithin into the fat films decreased the diffusivity of moisture, but increased the permeability of moisture due to the high moisture sorption capacity of these hydrophilic components.The effect of sucrose concentration and the presence of sugar ester in the aqueous phase on the diffusivity and permeability of moisture through the fat-based film were also studied. For pure PKO films, sucrose concentration of the aqueous phase and presence of sugar ester in the aqueous phase had no effect on the diffusivity and permeability. For fat-based films containing sucrose, with increasing sucrose concentration of the aqueous phase, the diffusivity increased but the permeability decreased. Presence of sugar ester at 0.3% in the aqueous phase significantly increased permeability of the fat-based films containing sucrose.The mass transfer coefficient for sucrose leaching from the fat based films into the aqueous phase increased with sucrose content in the film. The rate of sucrose leaching out from the fat film into 0.3% sugar ester solution was higher than that into pure water. The diffusivity of sucrose in the fat film leaching out into the aqueous phase increased with sucrose content in the fat films.     

Characterization of vapor-induced and liquid-induced moisture migration through fractionated palm kernel (PKO) based multiphase systems

Moisture migration through PKO based films under vapor-induced and liquid-induced conditions were investigated through measurements of unsteady state diffusivity, steady state permeability, and characterization of structure. A model was developed to describe changes in diffusivity through fat-based films containing hydrophilic components. At water activity gradients of 0.80 and 0.90, there were no significant differences in diffusivity and permeability values of PKO based films containing sucrose under vapor-induced and liquid-induced conditions. Addition of sucrose decreased both diffusivity and permeability of the films at a water activity gradient of 0.80. However, at a water activity gradient of 0.90, addition of sucrose increased permeability. At a water activity gradient of 1.0, diffusivity and permeability were significantly higher in sucrose containing films at liquid-induced condition than at vapor-induced condition. Addition of sucrose at a water activity gradient of 1.0 significantly reduced diffusivity but increased permeability under both vapor-induced and liquid-induced conditions. There were no significant differences in diffusivity and permeability of the film containing lecithin or cellulose under liquid-induced and vapor-induced conditions at a water activity gradient of 1.0. Addition of lecithin or cellulose significantly reduced diffusivity but increased permeability.     

彩色棉纤维吸湿性能研究

分析了彩色棉的吸放湿性能.在标准状态下,对彩色棉的吸放湿特征曲线进行了测定,并与本白棉进行了比较;根据特征曲线推导出了彩色棉纤维在标准状态下达到吸放湿平衡过程中,回潮率对于时间的回归方程以及吸放湿速率方程.结果表明:棕色棉纤维的吸湿能力与本白棉相似,初始吸、放湿速率高于本白棉;绿色棉纤维的吸湿能力比较差,吸湿速率低于棕色棉和本白棉.     

数控全自动回潮仪的研制

对被测物的湿度进行数字全自动控制的原理进行了全面论述,并研制出了控制仪器,用该仪器解决了用模拟电路制作的设备体积大、调试难、性能不稳定、控制误差大的问题,该仪器控制精度高,性能稳定可靠、调试容易、价廉物美。     

牛奶蛋白纤维与羊毛纤维吸湿性能对比分析

研究对比牛奶蛋白纤维与羊毛纤维吸放湿性能.对牛奶蛋白纤维在标准大气条件下的吸湿、放湿回潮率进行测定,描绘出吸湿放湿曲线,并与羊毛纤维进行了比较.根据吸湿放湿曲线,推导出标准状态下两种纤维的吸湿放湿速率回归方程.结果表明:牛奶蛋白纤维与羊毛纤维达到吸湿放湿平衡的时间及吸湿放湿曲线基本相似,吸湿过程中牛奶蛋白纤维和羊毛纤维达到平衡回潮率的时间几乎相同,而在放湿过程中牛奶蛋白纤维达到平衡的时间要低于羊毛.     

木材的水分与材性

本文着重介绍了木材吸湿、解湿特性对室内环境和木材干缩、湿胀特性对木制品形状与尺寸稳定性带来的重要影响，同时分析了木材中的水分对木材性质及加工利用的影响。     

棉纤维水分检测方法的研究

对以电阻法为设计原理的国产Y412系列原棉水分测试仪存在的测试结果误差大、稳定性差、通用性差等缺陷进行了分析。由于纺织纤维的直流电阻高、纤维介质在直流电场中存在极化现象，测试极板在直流电场中也易于极化等原因，使得用电阻法测试棉纤维水分含量存在难以克服的原理上的缺陷。在此基础上，提出以交流阻抗法测试纺织纤维的水分含量，并设计出适用的测试仪器系统。     

Prediction of moisture transfer parameters for microwave drying of lactose powder using Bi–G drying correlation

The mass transport properties characterising the drying of lactose powder were determined using a correlation proposed by Dincer and Hussain [Dincer, I. & Hussain, M. M. (2004). Development of a new Bi–Di correlation for solids drying. International Journal of Heat and Mass Transfer, 47, 653–658]. Experimental moisture content data for lactose samples dried under convective, microwave, combined convective-microwave and combined vacuum-microwave conditions were collected. The drying coefficients and lag factors were calculated from the experimental data and incorporated into the model. The Bi numbers were in the range 0.185–439, and moisture diffusivities and diffusion coefficients in the range from 0.135 × 10⁻⁹ to 102 × 10⁻⁹ and from 0.194 × 10⁻⁶ to 118 × 10⁻⁶ m/s, respectively. The predicted moisture profiles showed adequate agreement with the experimental observations, with the average error between experimental and predicted results being ±13.7%.     

竹炭纤维纺纱实践

为开发竹炭纤维产品,测试了竹炭纤维的物理性能,并与粘胶纤维、竹纤维进行比较.竹炭纤维是一种低强低伸型纤维,具有较高的回潮率.依据其物理性能,设计纺纱工艺并分析解决了纺纱中出现的问题.结果表明:通过上述工艺生产的竹炭纱线性能优良,具有可织造性.     

织物导湿性能的试验研究

探讨织物经纬密、织物组织等对其导湿性能的影响。设计了10种织物,包括9种不同经纬密和织物组织的棉织物和1种Coolmax斜纹织物,介绍了每种织物的规格;采用条带芯吸法测试了各试样的经纬向芯吸高度,并进行了分析;同时,测试了试样5不同测试宽度的芯吸高度;计算对比了经密均为200根/10cm的不同织物的透湿率。结果表明:棉织物导湿性随着经密的增大变化规律不明显,且经纬密差值也影响其导湿性;3种基础组织的织物导湿性不同,其中斜纹织物导湿性最好,缎纹次之,平纹最差。认为:Coolmax织物的导湿性明显高于棉织物。