西番莲粉喷雾干燥工艺研究

采用酶解西番莲汁为原料,以麦芽糊精为助干剂,通过喷雾干燥法制备了西番莲粉,研究麦芽糊精添加量、进风温度、进料流量和进料浓度对西番莲粉产率、VC含量和含水率的影响。在单因素试验的基础上,采用正交试验优化了西番莲粉喷雾干燥工艺参数。结果表明,西番莲粉喷雾干燥的最佳工艺参数为:麦芽糊精添加量60%(按照喷雾干燥前料液总固形物含量计算),进风温度170℃,进料流量9 mL/min,进料浓度30%,此条件下西番莲粉的产率50.47%,VC含量58.88 mg/100 g,含水率4.8%。制得的产品具有西番莲特有的果香,研究为西番莲的产品多样化提供新的方法和思路。     

香芋全粉喷雾干燥工艺参数研究

以香芋为原料,在单因素试验的基础上,通过正交试验优化香芋全粉喷雾干燥工艺参数,并对包埋剂进行了探讨。结果表明,添加0.01%的黄原胶作为包埋剂可提高出粉率,加速干燥,防止粘壁;香芋全粉喷雾干燥最佳工艺参数为:进料速率51 m L/min,进风温度190℃,料液浓度22%,雾化器转速21 000 r/min,该条件下喷雾干燥效果较好,制得的香芋全粉呈淡紫色,质地光滑,香芋固有气味浓郁,出粉率为15.74%,水分活度0.421,色泽L*值18.41,a*值2.65,b*值3.48,流动性13.9 cm,堆积密度0.46 g/m L。本研究获得的香芋全粉可作为食品配料应用在各类加工食品中。     

Domestic Sewage Treatment Using Three-stage SBR Denitrification and Phosphorus Removal Process

Based on the mechanism of biological phosphorus and nitrogen removal, the collision between on nutrient and resident time is given. In order to solve this problem, a new process for wastewater biological treatment- three-stage SBR process has been developed. Three- stage SBR process treat domestic sewage is applied, which controls various kinds of bacteria optimum growth with the different function that responsibility for removal organics, nitrogen and phosphorus existed in the different reactors and combine with the denitr/fying phosphorus removing process . The experiment results show that ,the three-stage SBR process not only improved the treatment efficiency that COD ,TN,and TPaverage removal efficiency is 87% ,80% and 86% , but also saved the energy cost. removal. The process can make better effect on simultaneous nutrients removal, simple operation and low cost will make a good application prospect for it.     

堆肥过程中硝态氮测定方法的改进

用酚二磺酸比色法做对比,分析了几种前处理条件对紫外分光光度法测定堆肥过程堆体中硝态氮含量的影响。结果表明,酚二磺酸比色法与经KCl溶液和超声波浸提,活性炭处理的紫外分光光度法硝态氮测定值相比无显著差异,且后者消除了有机物的影响,操作简便。改进后的方法回收率为96%～108%,变异系数1.7%～5.5%。     

牛奶红薯全粉窝窝头的配方及制作工艺研究

窝窝头是日常生活中常见的面食产品,传统的窝窝头存在口感偏硬、易掉渣等缺点。为解决这些问题,在传统窝窝头的配方中添加了牛奶,即以红薯全粉和面粉为原料,以牛奶替换配方中的部分水制作红薯全粉窝窝头。通过感官评价和质构特性检测,在单因素试验结果的基础上,通过正交试验优化工艺及配方,并综合评价牛奶红薯全粉窝窝头的品质。结果表明,牛奶红薯全粉窝窝头的最佳制作工艺及配方为：红薯全粉125 g,小麦粉125 g,水150 g,酵母2 g,牛奶98 g,白糖15 g,发酵时间40 min。在此条件下制作的牛奶红薯全粉窝窝头的感官评分为91.3分,其口感绵软,弹性适中,品质最佳。通过研制牛奶红薯全粉窝窝头,改善了窝窝头的品质,丰富了窝窝头的种类。     

Feasibility Analysis on the Treatment of Animal Manure with Denitrification and Methanogenesis Process

The anaerobic granular sludge was inoculated in an anaerobic reactor, and the simulated wastewater containing glucose and nitrite was used to analyse the process of methanogenesis and dennitrication. The results showed that while the loading rate of COD was increased from 1.5 to 10.5 kg·m-3·d-1 and that of NO2- -N from 0.15 to 1.05 kg·m-3·d-1 during the 50 d operation ofof the reactor, the removal efficiencies of COD and NO2- -N reached more than 80% and 98%, respectively. The reactor was used to treat the animal manure. The removal efficiency of COD was increased from 50% to 80% and that of NO2- -N reached more than 98%, while the loading rate of COD increased from 2 to 7 kg·m-3·d-1, and NO2- -N from 0.2 to 0.7 kg·m-3·d-1. Therefore, the results indicated that it was possible to remove bots nitrogen and organic matter of the animal manure through denitrification and methanogenesis process in the same reactor.     

Density Distribution of Sand Packing in Vacuum Suction Molding Process and its Influential Factors

By means are measured of the direct observation of the packing behavior of sand in the vacuum suction molding process.The air and powder pressure,density distribution of sand core.The packing mechanisms are studied based on these experimental results.It found that the density distribution of sand core is elucidated by powder pressure theory,and the density distribution is decided by air flowing,sand chocking and shearing.     

Analysis of Influencing Factors on Efficiency of Business Process

Efficiency of business process has a direct impact on the performance of the enterprise, and accordingly it is also influenced by the multiple factors within the enterprise. The article, with a structured method, analyzed various kinds of problems in the operations of business processes, and illustrated the influences between and among strategy, organization structure, management pattern, human resource and technology, etc. As to the approach of influences of relevant factors on process, the article discussed a basic thought to implement business process improvement, and put for ward an integrated solution involving enterprise strategy planning, business process, and organizational facilities. Meanwhile, a concise analysis was made on relationship between process analysis and informatization. It was given that business improvement was a fundamental and important part of the informatization of the enterprise.     

工作过程导向的食品分析与检验课程设计

阐述了食品营养与检测专业的核心专业课程食品分析与检验课程的方案设计,介绍了基于工作过程的课程方案开发思路和步骤,重点介绍了学习情境设计、教学实施过程,以及考核方式的改革。以学习情境为载体,可以使学生掌握相关知识,激发学生的兴趣和思维,达到提高学生综合职业能力的目的。     

烤烟散叶堆积烘烤工艺分析

介绍了上升式密集烤房散叶堆积烘烤在烤前的准备,烟叶成熟采收、散叶烘烤装烟量、装炕前按成熟度大致分类、装炕操作、门窗堵漏,以及散叶烘烤操作要点和烤后烟叶回潮.阐述了散叶烘烤原理,特别是装炕均匀度和防止风力“短路”等关键问题.     

绿茶粉加工工艺综述

国内外开发绿茶粉主要有三大类:超微细绿茶粉、抹茶和速溶绿茶粉。为了更高效地进行绿茶粉的生产,发展我国的茶粉业,总结了3类绿茶粉的生产方法,对各方法的生产关键步骤和主要工艺参数进行了详细阐述,旨在为生产企业提供参考。     

Production Planning Method for Steelmaking-continuous Casting Process Based on Time Backward and Process Simulation

Reasonable production planning effectively ensures smooth operation. According to the analysis of the characteristics of steelmaking-continuous casting production process, a production planning method for steelmaking - continuous casting process based on time backward inference method and process simulation is presented. Production plan meeting certain criteria is rapidly gained by time backward inference method, and is regarded as input of simulation model in steelmaking process. Considering time randomicity in production process and transporting equipment restriction, production plan meeting more restrictive conditions, such as no equipment conflict, continuous casting, and etc, is acquired through simulating. It assures that the plan is carried out in practice. The instance demonstrates the feasibility of the method.     

乳粉中非蛋白氮含量测定的不确定度评价

通过对乳粉中的非蛋白氮含量进行重复性测试,计算试验标准偏差,建立过程不确定度评价的数学模型,将测试过程中系统效应产生的不确定度进行了分类和量化,较为全面地评价了各个不确定度的分量,并提出该方法的不确定度评定结果。     

荞麦的营养特性及其加工技术探讨

荞麦是一种杂粮作物,荞麦食品具有特殊的食疗和保健作用,如何有效地加工和利用荞麦是人们研究的重点。叙述了荞麦的营养特性,并对荞麦加工工艺及设备选择作了重要阐述。     

浅圆仓环流充氮气调技术研究

本文主要对移动式膜分离制氮设备环流降氧工艺进行了探讨。采用"进仓纯氮气流量"指标对充氮效率进行研究。试验证明:环流充氮模式下,回流氮气浓度低于90%和在90%～95%之间时,设定制氮设备浓度和回流氮气浓度差在7%和3%～5%左右,充氮效果最佳;环流充氮与直接充氮相比进仓纯氮气流量最大可以提高33.3%,在进仓纯氮气流量最大时,流量可以提高19.2%;环流充氮有利于提高充氮效率和促进氮气浓度的均匀分布。     

Optimization and Operation Strategy of Hydraulic Retention Time in Modified Four Step-feed Process

A pilot modified four step-feed process was applied to deal with weak municipal wastewater. After 133 days of continuous operation with different hydraulic retention time(HRT) and operation strategy, the results are obtained as the following: (1)When HRT is reduced from 8.7h to 6h, there is almost no effect on performance of COD and TP, but would lead to increase effluent NH4 +-N and TN. Meanwhile, the influent carbon source utilization and simultaneous nitrification and denitrification (SND) are correspondingly decreased. (2)When HRT is 6h, the DO concentration in areobic zones are controlled between 1.0-1.5 mg·L -1 and adding suspended carriers in aerobic zones, the effluent performance of COD, NH4 +-N, TN and TP are 25.92, 1.98, 14.5and 0.47 mg·L -1 respectively. (3)Suspended carriers can be used to optimize the effluent ammonia and SND performance, and achieve 22% of TN removed through SND with suspended carriers. However, it's not obvious for suspended carriers to improve the influent carbon source effective utilization.     

Analysis and FEM Simulation of the Forming Process of Front Bumper Bracket

The processing characteristics of the front bumper bracket are analyzed,and a reasonable process scheme is worked out.The three-dimensional sheet metal forming analysis software PAM-STAMP are adopted to simulate the bracket's drawing process.Then the surface of die is proved fine through analyzing the FLD diagrams and the forming results.An economical and optimized die structure is decided,and a complete set of dies of the bracket is designed.The spacing block is added in the sizing mold,which control the size precision of end products and assembling columns actively,and finally the certified products.The material utility and the labor productivity are raised,the production cost is saved,and the mold design quality and the efficiency are improved effectively.