Modification of flour proteins by disulphide interchange reactions

The disulphide interchange between the flour proteins gliadin and glutenin, and three low mo), wt. disulphides has been studied. Suitable reaction conditions have been established, and the extent of interchange has been measured. the ‘mixed’ disulphide reaction products have been examined by gel-filtration.     

New sources of organic form zinc

The Comparative analysis of the efficiency of the enzymatic hydrolysis of the mussels meat has been carried out, using enzymatic preparations with proteolytic action called "Protozim", "Flavoenzyme" and "Pancreatine". Complexes of fermentolyzates of the mussels meat with zink have been obtained by the reaction of chelating. Prepared fermentolyzates and their complexes with zink have been determined by physicochemical methods. Composition of amino acids has been determined in fermentolyzates and in their complexes with zink has been characterized the content of zink. The valuation of molecular-mass distribution of peptide fractions of fermentolyzates and their complexes with zink has been given.     

Value stream mapping approach and analytical network process to identify and prioritize production system’s Mudas (case study: natural fibre clothing manufacturing company)

The current research has been done to identify and prioritize the Mudas of the production line of a natural fibre clothing manufacturing company; in this way, value stream mapping has been used to identify the Mudas, then analytical hierarchy method has been used to screen the Mudas. In the first step, necessary information to design value stream of production process has been obtained by observation, measurement and interview; afterward, according to the obtained information and by forming a focus group, Mudas in the production line have been identified and prioritized according to seven categories of Mudas. In order to prioritizing the Mudas by the usage of analytical hierarchy method, the Super Decision software has been applied. Then, according to the obtained priorities, suggested map of the future value system has been drawn and some suggestions have been presented to eliminate Mudas and move towards the lean manufacturing.     

Melanoidin formation in L-ascorbic acid-α-amino acids interaction. A comparative study

Nondialysable melanoidins have been isolated from the model systems L-ascorbic acid-L-glutamic acid. A comparison with L-ascorbic acid interactions with glycine and L-lysine has been made. The influence of reaction parameters on the formation of melanoidins has been studied. Their fractional and spectral characteristics and the kinetic thermodynamic parameters have been discussed.     

Computational fluid dynamics modeling of gas dispersion in multi impeller bioreactor

In the present study, experiments have been carried out to identify various flow regimes in a dual Rushton turbines stirred bioreactor for different gas flow rates and impeller speeds. The hydrodynamic parameters like fractional gas hold-up, power consumption and mixing time have been measured. A two fluid model along with MUSIG model to handle polydispersed gas flow has been implemented to predict the various flow regimes and hydrodynamic parameters in the dual turbines stirred bioreactor. The computational model has been mapped on commercial solver ANSYS CFX. The flow regimes predicted by numerical simulations are validated with the experimental results. The present model has successfully captured the flow regimes as observed during experiments. The measured gross flow characteristics like fractional gas hold-up, and mixing time have been compared with numerical simulations. Also the effect of gas flow rate and impeller speed on gas hold-up and power consumption have been investigated.     

论纺织工程张力控制技术发展路线图

纺织工程作业全过程都存在张力控制的问题。文章分析了从前纺工序到织布、后处理整个工艺流程的物质形态,归纳了典型纺织作业方式下张力控制的特点,研究张力控制问题的不同性质、任务,纵观全行业张力控制技术状况,就3种物质形态的4种典型工序收放运动特点、张力控制要求,提出了纺织装备可持续发展的路线图,即加快研究系列化、模块化的智能张力控制系统商品,以此可带动纺织装备智能化,满足市场对纺织装备需要用工少、维护少、连续高速,可生产多品种、小批量、高品质纺织品。     

食品中甲基汞检测技术研究进展

甲基汞因其生物蓄积性和持久性而成为毒性最强的污染物之一。近年来,色谱和原子荧光或等离子体质谱的联用技术已经成为甲基汞检测的主要方法,将色谱的高效分离技术与光谱和质谱高灵敏度的检测技术结合起来,可以满足目前甲基汞检测的需要。常见的食品中甲基汞检测分提取、分离和测定3个步骤。本文对甲基汞检测的不同方法进行综述,并讨论了实验步骤中甲基汞的转化过程。分析了包括酸式、碱式、有机试剂以及蒸馏提取在内的不同提取方法的特点;比较了包括液相色谱、气相色谱在内的常见分离方法的分离效果;对比了电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)和原子荧光法(atomic fluorescence spectrometry,AFS)这2种常见检测方法的优劣。展望了食品中甲基汞测定的发展方向,为今后甲基汞分析方法的开发和标准化提供了思路和借鉴。     

POLYPHENOLS OF CASHEW KERNEL TESTA

SUMMARY: The chemical nature of the polyphenols of cashew kernel testa has been determined by means of 2-dimensional paper chromatography and specific reactions. Presence of (+) catechin and (-) epicatechin as the major polyphenols has been confirmed by co-chromatography with authentic samples. Proanthocyanidins have been studied by treatment with hot acid and identification of the resultant anthocyanidins. Leucocyanidins and leucopelargonidins have been noticed as monomeric components, whereas polymeric proanthocyanidins contain in addition small quantities of leucodelphinidin. Individual components have been quantitatively estimated colorimetrically with Folin-Denis reagent, after separation by fractional extraction using solvents of increasing polarity and paper chromatography. The characteristic bluish-black discoloration noticed in cashew-nuts has been identified as an iron-polyphenol complex formed during processing. The polypnenols were found to be derived from the testa.     

SK6/600成绳机工艺装备的改造

对ＳＫ６／６００成绳机进行工艺装备改造后，解决了钢绳松散、直径超差、各股受力不均等问题，提高了钢丝绳的捻制质量。     

Computer-aided engineering systems in wood industry

A project concerning integrated computer-aided engineering systems in forest product industry has been carried out at Lund University, Sweden. Application programs which are parts of an integrated system have been developed, both programs based on AutoCAD and finite element analyzing programs. The work has been performed in cooperation with two factories, and contacts have also been taken with some presumptive customers to these factories. On the basis of a data base, computerized product catalogues have been developed. This paper describes the basic ideas in the project and some of the results are presented.     

Studies of factors affecting light scattering by individual human hair fibres

An automated goniophotometer has been built to investigate the scattering of light by different types of singly mounted human hair fibres using white light and laser illumination. The effects that varying hair colour and treatment (gold coating, ultraviolet irradiation and dyeing) have on the specular reflectance and on the half-peak-height width (ω) have been studied. The polarization of light has been used to discriminate between light reflected from the front surface and light scattered internally by the hair. It has been found that the analysis of results from individual hair fibres has been useful in understanding the light scattering mechanisms which occur in human hair.     

循环经济与广东造纸工业的可持续发展

广东省委、省政府高瞻远瞩，把造纸工业列为我省有潜力发展的支柱产业之一，为我省造纸工业的发展创造了新的机遇。本文分析广东造纸工业的发展概况，阐述循环经济的基本准则和适应性，介绍我省造纸企业发展循环经济的实践与成效．提出了实行循环经济、加快我省造纸工业发展的若干建议。     

现代经编技术进展(六)

近十年来经编无论在机器高速化、控制电子化、功能多样化、操作便利化、设计电脑化和管理网络化等方面都有飞速的发展,现代经编机已完全成为一种现代化的设备。机器速度达到3600r／min,梳栉达到95把,起花的可能性大大的提高,进一步扩大了产品的应用范围。讲座介绍了国内外经编设备和技术的最新发展,阐述了一些经编新概念和技术特征,分析了一些典型机构的结构与工作原理,并对计算机技术与信息技术在经编中的应用进行了探讨。     

Dynamic analysis and control of cotton-carding system

In this paper, the control model of cotton-carding system has been evaluated for uniform carded web density. At first, transfer function of cotton-carding system has been analysed. Then with respect to the stability of the system, and to eliminate the steady-state error, a controller has been designed with a feedback to improve performance of transient state. For this aim, proportional, integral and proportional–integral controllers have been studied. The values of the best time constant have been calculated with stability condition. Results show that the proportional–integral controller can create the most stable state for this system model.     

微波真空干燥胡萝卜片过程中收缩变形的数学模型研究

研究胡萝卜片微波真空干燥过程中物料的收缩变形,利用正交试验,得出各因素对胡萝卜片干燥变形的影响程度大小及因素之间的相互影响关系,通过数学回归,得到胡萝卜片微波真空干燥过程收缩变形的数学模型方程,并对方程的显著性检验以及参数进行了综合优化,提出了胡萝卜收缩变形较小的微波真空干燥工艺参数的最佳组合.     

Durability of Handmade Wool Carpets: A Review

This paper presents various aspects related to the durability characteristics of handmade carpets. Various kinds of materials and knots used in handmade carpet have been explained at the beginning. Then the mechanism of carpet durability has been explained with respect to mechanical and appearance aspects. The various techniques for measuring the mechanical and appearance related durability characteristics have also been presented in this article. Finally, the influence of wool fibre, yarn, and carpet structural parameters on the durability has been explained. The shortcomings in terms of durability, characterization of carpets, and scope of further research have been presented at the end of the review.     

校企协同视角下大学生科技创新能力提升探究

通过校企共同开发特色课程体系、搭建“四位一体”科技创新实践平台、共建创新型教师队伍,推进了课程体系、教学内容及教学方法改革,培养了学生的综合素养和团队合作意识,挖掘了学生的创造潜能,提升了创新能力和科技研发能力。并通过建立科学有效的科技创新管理和评价机制,营造出良好的科技创新校园文化氛围,并形成大学生科技创新文化建设长效机制,保障了科技创新人才培养的可持续发展。     

提高禁用偶氮染料检测准确度缩短与国际标准的差异

将我国纺织品上禁用偶氮染料检测方法国家标准,与目前被全球采用的欧盟方法标准在技术条件和操作程序上进行了比较分析,找出了我国现行方法中在适用范围、样品预处理、定性/定量方法的选择等方面同欧盟方法存在的差异,指出了GB方法中影响检测准确度的因素,探讨了提高AZO检测准确度的措施。     

Degradation of methylparathion in aqueous solution by electrochemical oxidation

The electrochemical degradation of methylparathion has been investigated by using Ti/Pt as anode, Stainless Steel 304 as cathode, and sodium chloride as electrolyte. The pesticide is rapidly degraded, but full mineralization is not observed. Degradation products have been monitored through gas chromatography and mass spectrometry, and the overall degradation process has been monitored through dissolved and particulate organic carbon, sulfur, and phosphorus measurements. Several intermediates have been identified, and oxalic, formic, and acetic acids as well as tetraphosphorus trisulfide have been recognized as final products of the degradation process. A proposed mechanism of the process is presented.     

The Action of Bacillus subtilis Saccharifying Amylase on Starch and β-Cyclodextrin

The action of B. subtilis saccharifying amylase on starch has been examined. It has been found that high yields of reducing sugar and glucose are produced from both starch solutions and starch gels upon prolonged reaction. The enzyme has also been found to have maltase and cyclodextrinase activities and to produce an almost quantitative yield of glucose from β-cyclodextrin. Attempts to separate or differentiate the amylase, maltase and cyclodextrinase activities by electrophoresis, inhibitors, heat inactivation and hydroxylapatite chromatography have been unsuccessful, and it is concluded that the enzyme activities are all due to one molecular species.