对改进稻谷脂肪酸值测定方法的探讨

稻谷中脂肪酸经提取后,采用返滴定法,先用过量的氢氧化钾标准滴定溶液与其反应,再用硫酸标准滴定溶液滴定过量的碱液,然后计算脂肪酸值。结果表明,采用本方法与现行国家标准相比结果一致,但本方法终点易于判断,重复性较好(RSD=0.95%)。     

基于嵌入式机器视觉的粮油滴定分析仪研究

论述了基于机器视觉技术的JDDY型粮油滴定分析仪的原理和特点,建立了滴定分析平台,可用于根据颜色变化判定终点的粮油品质指标滴定实验,解决了手工滴定终点难以判断的问题。该仪器的准确度、重复性、台间差等使用性能好,仪器对滴定终点反应敏锐、准确,检测结果稳定,具有较宽的测量范围,方便快捷,易学易用。研究表明:该仪器测定结果准确、可靠,重现性较好,可操作性强,检测结果具有可比性。     

改进粮食脂肪酸值滴定方法探讨

通过大量试验和数据的对比,摸索出了几点改进脂肪酸值滴定的方法,在不影响准确度的情况下,使操作过程更简练、更节约成本费用。     

保健食品中软胶囊酸价检测方法的选择

探究4种不同检测方法的适用范围、最优测定条件,为不同品种软胶囊酸价检测提供最适合的方法。对不同类型软胶囊内容物特性的分析选择适用的测定方法,并确定每种检测方法的最优测定条件。方法一适用于单纯浅色油类混合配制而成的浅色内容物软胶囊样品,称样量为20 g,滴定液为氢氧化钠(0.02 mol/L);方法二适用于能全部溶解于混合溶剂或石油醚(I)中的深色内容物,称样量为5 g,滴定液为氢氧化钠(0.02 mol/L);方法三适用于不能全部溶于石油醚(I)中的深色内容物,或本身含酸性物质的软胶囊样品,油脂称样量为2~3 g,滴定液为氢氧化钠(0.02 mol/L),根据油脂状态采用手动滴定或自动电位滴定法;若考虑样品整体性质对软胶囊酸败的影响,可选择方法四进行测定,根据对软胶囊内容物特性分析及过对4种测定方法最优条件确定结果,企业可依据软胶囊品种的类型选择合适的检测方法。     

测定条件对粮食脂肪酸含量测定结果的影响

粮食脂肪酸含量是品质变化的灵敏指标之一。通过脂肪酸的测定可以判断粮食品质变化情况,研究和改善贮藏条件和方法。如果粮食脂肪酸增加就说明粮食在变质。因此,测定粮食脂肪酸含量已成为检查粮食品质好坏的重要手段之一。测定粮食脂肪酸一般分为粉碎、提取、过滤、滴定以及氢氧化钾酒精溶液标定等步骤。脂肪酸与脂肪一样能溶解于有机溶剂中,通常用苯浸出提取,过滤后取出一部份滤液,用氢氧化钾酒精溶液滴定,根据滴定结果可以计算出脂肪酸的含量,要求测定的结     

影响食盐中碘含量检测结果准确性的主要因素

碘是食盐重要的监测指标,研究了影响食盐中碘含量检测结果准确性的主要因素及试验过程中注意的事项。结果表明,对于加碘食盐而言,为保证检验结果的准确性,检测过程中应注意:(1)将碘盐研磨粉碎后均匀取样;(2)有效氯含量应适度过量,含量为3%较为适宜;(3)滴定过程中试样溶液滴定至浅黄色后再加入淀粉指示剂;(4)滴定终点以样液蓝色消失为终点,切勿直接滴定到澄清透明。     

几种碱性试剂对循环水养殖系统中pH值调节的研究

在循环水养殖系统中pH值会因为鱼类所排放的CO2和硝化反应所产的酸而降低,过低的pH值会对鱼类生长产生十分不利的影响。因此加碱调节pH值对于维持循环水养殖的稳定运行时非常重要的。目前关于这方面的研究以理论分析为主,具体实验研究较少见。采用氢氧化钠、碳酸钠、碳酸氢钠溶液对采集于淡水循环水养殖系统中的水样进行滴定实验,得到相应的滴定曲线,与同等条件下滴定的去离子水曲线比较后发现,淡水循环水养殖系统中的水体具有缓冲性。氢氧化钠的滴定曲线与碳酸钠、碳酸氢钠的滴定曲线相比,在突越点前和在突越点后,pH值的变化都相对剧烈,为了避免加碱后会对水体pH值产生较大波动,宜选择碳酸钠、碳酸氢钠等弱碱性物质。同时,在pH值降至突越点之前,补充碱性试剂是一个较合适的时机。     

影响稻谷脂肪酸值测定的因素

脂肪酸值是稻谷品质判定的重要指标之一,通过比对试验发现,样品的代表性、试样的粗细度、环境温度、称样量、提取时间、静置时间、滴定液浓度、滴定速度等因素,都会对其测定产生影响。据此提出了准确测定稻谷脂肪酸值的措施和建议。     

果梗涂蜡复合处理对红地球葡萄贮藏品质的影响

以红地球葡萄果实为试验材料,研究了果梗涂蜡方法及添加CT2保鲜剂、1-MCP等处理方式对其贮期内果实腐烂率、干梗指数、SO2伤害指数以及硬度、呼吸强度、还原糖、可滴定酸和VC等指标的影响.结果表明:果梗涂蜡和果梗带枝条配合使用保鲜剂的处理方式,能有效降低红地球葡萄呼吸强度、腐烂率、干梗指数和SO2伤害指数,保持其硬度及还原糖、可滴定酸和VC含量的稳定性,提高贮藏品质,延长葡萄的贮期.     

对微量凯氏定氮法测定蛋白质含量的改进

以经典的微量凯氏定氮法为基础,对消化装置进行了一定的研究和改进,使消化时间大大缩短;并针对混合指示剂必须现用现配且滴定终点不易判断的不足,选用酸度计代替混合指示剂判断滴定的终点,使测定结果的准确度提高。实验表明,改良后的蛋白质含量测定方法不仅操作简便,而且污染减少,结果更加准确。     

Investigation on ARM9-based Embedded Fingerprint Identification System

This paper introduces an implementation method of Embedded Automatic Fingerprint Identification Systerm(AFIS), dealing mainly with hardware components and software modules based on ARM9. Hardware system consists of ARM9 series S3C2500, FPS200 sensor, memories, power supply ,communication interface, etc. System initiation, fingerprint sampling procedure and communication program are main modules making up of system software.The conflict of time-sequence between S3C2500 and sensor FPS200-one of the key links of the system, has been solved successfully. The system has integrated functionalities,such as fast sampling, communicating with upper and lower computers, establishing a complete and reliable platform for fingerprint image processing and identification.     

Analysis of embedded gas detection system based on nano-porphyrin arrays

In view of the necessity of gas detection in environment, an embedded gas detection system is designed based on the basic principles of chromatography change of chemical reaction between nano-porphyrin arrays and micro-gas, which takes ARM9 S3C2440A as the core and nano-porphyrin array as the sensors. The overall program, the circuit organization and control software of the main function module such as spectrum signal acquisition, processing and monitoring are presented. With energy conservation differential equation, the control model of temperature and flow rate in the sample chamber is established, which can precisely control the detection conditions of chemical sensors. Some typical trace gases such as ammonia, enanthaldehyde, cyclohexane and hexanal are tested by the system, and the results show that the system can achieve rapid and accurate detection of trace volatile gas.     

A High Precision Simulation Algorithm of Linear System and Its Realization

Based on Cayley Hamilton theorem,a high precision simulation algorithm of multivariable linear system is proposed,and applied to SISO and MIMO system simulations.It also has been made test and simulation compared with every kind of systems with popular software MATLAB.     

基于ARM的粮仓节能通风控制系统

粮食储备已经提升到我国重要的战略地位,各省市地方都在大力新建粮食储备库。粮食储藏主要是依靠通风降温、降水,但判断通风时间大多依靠保管员经验是否丰富,温湿度的检测是否及时到位。稍有疏忽往往会造成粮食的变质或者电能的浪费。针对此问题结合当前新技术的发展设计了一套以ARM9体系为主体的节能通风控制系统,成本低廉,高效节能。     

Design and Implementation of Fingerprint Identification Module Based on DSP Chip

An automatic fingerprint identification module based on the fixed DSP chip TMS320VC5410 and the fingerprint sensor FPS200 is presented. The program of fingerprint identification algorithm mixes the assemble language and C, which implements a high effective and low cost embedded system. The software and hardware design and implementation of this system are introduced later. In experiments, the module is fast speed and accurate, and takes a very good performance.     

Disign and Implementation of Speaker Recognition System Based on FPGA

Aiming at the shortcoming of low recognition and training speed in embedded speaker - recognition system based on DS Phard-core processor, a new scheme of system based on FPGA and vector quantization principle is presented. In the speaker-recognition system based on the vector quantization and generation algorithm, a fitness parallel process hardware structure is presented by the scheme which consumes much less time than software processing while getting the fitness. The test shows that the system uses this method obtains both high recognition rate and higher speed in training and recognition.     

温室环境控制系统的发展

本文详细介绍了国内外温室环境控制系统在软硬件设计、控制策略、节能方面的研究进展。指出应优化控制系统性能,将专家系统、遗传算法和模糊神经网络等多种控制算法和仿真预测相结合,并采取各种控制措施,以减少调控所需的能源消耗,提高能源的利用率,为植物创造最优的生长环境,促进设施农业的全面发展。     

Sky luminance distribution model by ant colony systems

The sky luminance distribution model is developed by information analysis methods with ant colony system. A new arithmetic is given to solve complex optimization heuristic algorithm. The coefficient values of sky luminance distribution function are obtained by optimization analysis with ant colony system and on which a set of practical software is developed. It can provide an intuitive and easy calculation. The model has higher precision, which can provide valuable results on high precision and standard daylighting design.     

Optimization Design of MPEG-4 Video Codec Architecture

The author analyzs computational complexity of previous MPEG-4 video codec system in terms of data processing, memory accessing and address computation, and optimizs the performance of data processing and data transfer of MPEG-4 video coding and decoding algorithm. The architecture model of the real-time MPEG-4 video codec is proposed based on the analyses. This architecture can effectively utilize computational resource in software and improve the performance of MPEG-4 video codec system.