对3号煤矿粉状铵梯炸药结块原因分析及对策

文中从原材料水分、装药温度、半成品吸湿性与成品水分等方面，探讨了３号煤矿粉状铵梯炸药结块硬化的影响因素。     

4号岩石粉状铵梯油炸药结块原因分析及对策

文章从成品水分、装药温度,外界压力等方面,探讨了４号岩石粉状铵梯油炸药结块硬化的影响因素。     

影响4号岩石粉状铵梯油炸药产品质量的探讨

文中从原材料硝铵水分、热混压硝细度、木粉细度、半成品吸湿和成品水分等方面，探讨了４号岩石粉状铵梯油炸药产品的影响因素。     

复烤烟叶快速水分测定法乳烘箱水分测定法的比较

比较了快速水分测定法和烘箱水分测定法的差异。结果表明，快速水分测定法在同一温度条件下，随着烘烤时间的延长，所测烟叶样品的水分含量值也随着增大，综合温度试验和时间试验，快速水分测定法以测定温度为106℃、测定时间为7min的测定值与烘箱水分测定法的测定值接近。     

烟支水分及密度测量仪的研究与应用

烟支水分密度检测仪无需任何处理便可直接测量成品烟支的水分和密度,可实现对卷烟机卷制水平的跟踪监控。     

气流粉碎干燥制备超细磷酸铁锂粉的工艺

采用LNJST-120HT型闭路循环氮气保护气流粉碎分级系统对磷酸铁锂粉进行超细加工、干燥;对粉碎、分级、收集、输送和包装系统的操作参数、设备结构及系统运行过程中出现的流动性、水分增加等问题进行分析探讨,并优化改进;通过加工超细磷酸铁锂粉的工业试验,对改进后的超音速气流磨进行测试。结果表明,控制螺杆加料机和分级机转速分别为62和1 072 r/min,气源压力和温度分别为0.5 MPa和120℃,包装房露点温度控制在-20℃以下,磷酸铁锂粉成品水分含量维持在0.35‰~0.55‰,成品粒径d_(50)=0.8~1.2μm、d_(100)<8μm,产量为200~230 kg/h。     

皮革制品有害物质检测方法分析

近年来,皮革工业面临的技术壁垒尤为突出。目前皮革的检测项目已不局限于收缩温度、pH值、三氧化二铬、水分等常规项目和撕裂强度、抗张强度等物理性能的检测,涉及安全卫生性能的有毒有害物质的检测,也越来越引起人们的重视。我国皮革业要谋求进展,除了科技工作者们不断开发新工艺、研发新产品外,提高成品的检测能力也十分重要。     

导火索生产工序之间的技术指标控制

为了保证导火索各项技术性能稳定,只对进厂后的各种原材料进行理化测试往往不够,还必须在生产过程中对各工序之间的原料、半成品和成品制订出切实可行的控制指标,如杂质、细度、水分和温度。这些控制指标也是保证导火索质量的重要环节。一、外来杂质的控制杂质是与生产原料无关的外来物质,有些是柔性的,有些是硬质的。在导火索的生     

纸张快速水分测定法和烘箱水分测定法的比较

比较了快速水分测定法和烘箱水分测定法的差异。结果表明,快速水分测定法在同一温度条件下,随着烘烤时间的延长,所测纸样品的水分含量值也随着增大,综合温度试验和时间实验,快速水分测定法以测定温度为115℃、测定时间为2.5min的测量值与烘箱水分测定法的测定值接近。     

复烤烟叶快速水分测定法和烘箱水分测定法的比较

比较了快速水分测定法和烘箱水分测定法的差异.结果表明,快速水分测定法在同一温度条件下,随着烘烤时间的延长,所测烟叶样品的水分含量值也随着增大,综合温度试验和时间试验,快速水分测定法以测定温度为106℃、测定时间为7min的测定值与烘箱水分测定法的测定值接近.     

真空冷却过程中水分迁移的数学模型

从真空冷却的基本理论和基本定义出发,分析了真空冷却过程中产品内部的水分迁移过程,建立了真空条件下水分迁移的数学模型.通过数值模拟得到了产品内部、产品表面水分含量随时间的变化曲线及产品的质量损失随时间的变化曲线.利用文献中的试验数据对模拟结果进行了验证,模拟结果与文献中的试验结果基本一致.这表明数学模型可以用来预测真空冷却过程中产品的水分含量和质量损失,具有一定的理论意义.     

碳钢在中性土壤中的腐蚀行为研究

总结了碳钢在不同湿度中性土壤介质中腐蚀初期的电化学阻抗谱特征 ;同时讨论了湿度对钢铁土壤腐蚀电化学行为和土壤腐蚀控制特征的影响。     

Shelf life prediction of oxygen‐sensitive products: The influence of moisture on prediction accuracy for freeze‐dried coffee

Optimised packaging requires that properties are matched to the protection requirements of food for its shelf life duration. Benefits include reduced packaging costs, use volumes, and potentially improved environmental performance. The ability to predict product shelf life in different materials can assist in selecting optimal packaging. However, the availability of such tools is limited, and risk for over packing exists. The aim with this work is to develop a prediction approach which can be applied to assist users to select more optimal packaging materials. Soluble coffee was used to develop the approach, where oxygen consumption of the product is used as a quality indicator. The effect of moisture content on O₂ consumption was studied to determine its influence on prediction accuracy. Samples were prepared with different levels of moisture content. O₂ consumption rates were measured, and a notable influence of moisture was observed. A model was developed to predict the O₂ consumption of the product when packed in a pouch. The model considers oxygen and moisture permeation properties of the packaging film, O₂ and moisture differential between the interior and exterior of the packaging, and the evolution of the O₂ consumption rate as a function of moisture increase. To test model accuracy, coffee samples were packed in flexible pouches, and O₂ consumption was measured which showed that predicted and measured values shared the same trend characteristics. We show that considering both moisture and O₂ ingress simultaneously leads to more precise shelf life prediction as oxidation rate is influenced by moisture content.     

不同含水量木质生物质的粉碎特性研究

为考察不同含水量木质生物质的粉碎特性,用人工喷洒方式制备一定含水量的木质生物质,并利用配有热风炉的超级涡流磨在最大加工能力条件下进行粉碎实验。结果表明,木质生物质产品的粒度、均匀性系数先增加后减小;长径比总体呈增长趋势;振实密度和松装密度逐渐减小;压缩比先变化缓慢,然后增加;产品的含水量、生产能耗逐渐增加。     

冻干工艺中升华结束点和残余水分测量方法简述

升华结束点和残余水分的在线测定是冷冻干燥科学实验及其工艺中的重点和难点 ,着重对其常用确定方法理论模型法、产品温度响应法、压力升高法、湿度传感器法、残余气体分析仪、脉冲核磁共振法 (NMR)、称重法 (重量传感器法 )等 7种方法加以总结和概括。指出脉冲核磁共振法和湿度传感器法将为冻干理论研究和实验研究拓展新思路     

Superheated steam drying of Brewer’s spent grain in a rotary drum

Relative to conventional air drying, superheated steam (SHS) drying provides a number of benefits such as increased efficiency, reduced risk of fire and explosion, sterilization, deodorization and faster drying rates. Brewer’s spent grain (BSG) is the by-product from beer brewing. It is a sticky material with a tendency to foul drying equipment. This paper evaluates the drying behaviour of BSG in a pilot-scale rotary SHS dryer. The evaluation is based on product moisture content, measurements of sticking and energy consumption.The results of an experimental design for three system parameters (steam temperature, steam velocity and feed rate) are presented for two processing levels. The critical parameters with the most significant effect on the moisture content are the feed rate and the inlet steam temperature. The sticking profile was found to vary exponentially along the drum length. A correlation between sticking and product moisture content was obtained and the operating conditions which minimize sticking were determined.An evaluation of the energy consumption showed that around 70% of the heater energy was used in drying. The remaining energy is lost due to surface losses and cold air ingress.This study has demonstrated that BSG can be dried successfully and efficiently with the proposed technology.     

The Determination of Water in Freeze Dried Pharmaceutical Products by Performing the Karl Fischer Titration in the Glass Container Itself

A micro device is described by which it is possible to perform the Karl Fischer titration in the ampoule or vial containing a freeze dried pharmaceutical product. Using this device, it is not necessary to transfer the product from the original container into another vessel which means less manipulations to be performed and a lower risk to changes in moisture content during the analytical procedure.     

The Effect of Moisture Content of Microcrystalline Cellulose on the Compressional Properties of Some Formulations

The effect of moisture content of microcrystalline cellulose (MCC) on the compression properties of systems containing this diluent, has been examined. The formulations used included a product containing 97% MCC and two MCC based direct compression systems containing 49.5% paracetamol and 68% potassium phenethicillin. The MCC used contained moisture levels ranging from 0.6 - 7.3%. The tablets were made on an instrumented machine in conditions of relative humidity not exceeding 40%. The following tablet MCC are well documented, little has been published on the effect of moisture on its compressional characteristics. Also since it is common industrial practice to dry excipient before use with moisture sensitive drugs, a study of the effect of MCC on its compressional, disintegration and dissolution properties should be useful.     

In situ ozonation of anthracene in unsaturated porous media

Soil column experiments were conducted to investigate the effect of ozonation duration, contaminant content, particle size, moisture content, OH radical scavenger and soil organic matter on the removal of anthracene by in situ ozonation. In the whole study, the gas flow rate was 100 mL/min and concentration of gaseous ozone was 40 mg/L. The removal efficiency increased with the elapsed time, but the removal rate decreased in the range of 0–90 min. As anthracene content in sand decreased from 50 to 10 mg/kg, the removal efficiency increased from 42.1% to 62.0%, and ozone passed through soil column more rapidly. However, the ozone effectiveness reduced when anthracene content dropped. Small particle size provides a large interfacial area, which led to the high removal efficiency and long ozone breakthrough time in the column. The profile of residual anthracene in soil column varied more greatly at smaller particle size. The removal efficiency reduced when the moisture content rose from 0% to 9.1%. The ozone breakthrough time also decreased with the increasing moisture content. The presence of sodium bicarbonate or humic acid reduced the removal efficiency to some extent. GC–MS was employed in this study to determine 9,10-anthraquinone as the main ozonation product.     

Effect of Aqueous Film Coating Conditions on Water Removal Efficiency and Physical Properties of Coated Tablet Cores Containing Superdisintegrants

Few studies have examined the effect of aqueous film coating process conditions on the physical integrity of the final coated product. Characterization of the aqueous film coating process was previously carried out by selecting water removal efficiency as the response variable to detect and monitor moisture accumulation in the tablet bed [1]. In this study, regression techniques were utilized to obtain the relationship between some physical characteristics of aqueous film coated tablet cores that contained superdisintegrant and several process parameters such as inlet air temperature, spray rate, and pan speed. Tablet response variables measured included residual moisture content, tensile strength and percent porosity. Predicted values of these properties were plotted as a function of the inlet air temperature and the coating solution spray rate. The correlations between the coated tablet response variables and the water removal efficiency of the coating process indicated that coated tablet properties such as residual moisture content, tensile strength, and porosity were linearly correlated with the water removal efficiency of the coating process, which is indicative of the environmental coating conditions present in the coating pan.