Synthesis and application of a novel cold brand reactive dye to impart colouration,mosquito repellency,and UV protection to nylon

Mosquito-borne diseases are a great concern for human health, and an increment in urbanization causes a rise in the population of mosquitoes. The efficient methods and products for countering mosquito bites are the urgent need of the hour. To protect against mosquitoes, mosquito repellent textiles are an attractive substrate. An impartment of simultaneous dyeing and finishing effects on nylon is an urgent requirement as it can enhance its applicability in various technical applications. The present study reports the preparation of a mosquito repellent-cum-UV protective nylon using a novel reactive dye. The synthesis of dye involves the reaction of cyanuric chloride with H-acid (sodium 4-amino-5-hydroxy-2,7-naphthalene disulfonic acid) to generate cyanuric-H-acid, which was further reacted with diazotised 4-amino-N, N-diethyl-3-methylbenzamide (DEET-NH₂) to synthesise a novel cold brand reactive dye. Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (¹H NMR), elemental analysis (CHN analyser), UV–vis spectroscopy, and thermogravimetric analysis (TGA) were used to characterise the synthesised dye. The colouration of nylon was done in an infrared lab dyeing machine. The exhaustion and fixation of dye on nylon and the colouration properties (L*, a*, b*, C*, K/S) of dyed nylon were explored. Functional properties (mosquito repellency and UV protection) were evaluated even after laundering treatments. The dyed fabrics were also characterised using TGA and scanning electron microscope (SEM) analysis. An outstanding mosquito repellency (100 %) and good UV protection were achieved.     

考虑制造商开设展厅的横向竞争博弈及定价-服务策略

从体验成本差异角度出发,将消费者分为高低体验成本两类,利用Hotelling模型构建消费者的效用函数。分析两个竞争性制造商关于开设展厅的Bertrand博弈以及展厅开设后的价格与服务决策。结果表明,当低体验成本消费者较多且产品匹配度较高或者低体验成本消费者较少时,两个制造商均开设展厅,但双方都获得最低的利润,陷入囚徒的困境;当低体验成本消费者较多且产品匹配度较低时,两个制造商都不开设展厅,双方达到帕累托最优。     

专有服务机制下提供免费体验服务的服务系统优化设计研究

通过提供免费的体验服务,服务系统可以吸引潜在顾客成为忠实顾客。本文考虑专有服务机制下提供免费体验服务和付费(常规)服务的服务系统,基于顾客的延时敏感特性,利用排队论的矩阵分析方法和谱扩展方法,研究服务系统的相关性能指标以及服务系统的优化设计,进而构建服务提供商利润函数并通过数值实例来获得免费体验服务的最优服务速率以及常规服务收取的最优服务费用,并为服务提供商提供相应的管理启示。研究表明,当越来越多的体验顾客转为付费顾客时,服务提供商需要降低体验服务的服务速率,来缓解系统的拥堵情况,减少顾客的逗留时间,并且服务提供商需要降低常规服务的服务费来弥补顾客因拥堵而造成的服务延迟。新到达顾客选择体验服务的人数越多时,服务提供商需要大幅度降低常规服务的收费标准,来吸引体验顾客成为付费顾客。     

Some numerical experience with a globally convergent algorithm for nonlinearly constrained optimization

Global convergence properties are established for a quite general form of algorithms for solving nonlinearly constrained minimization problems. A useful feature of the methods considered is that they can be implemented easily either with or without using quadratic programming techniques. A particular implementation, designed to be both efficient and robust, is described in detail. Numerical results are presented and discussed.This work was carried out by the first author under the support of the Science Research Council (UK), Grant Nos. B/RG/95124 and GR/A/44480, which are gratefully acknowledged.     

品牌建设与创新产出的关系研究——基于信号理论的视角

高校的品牌建设是高校发展过程中必须面对的问题,本研究基于信号理论的核心构念建构了高校品牌营建的体系,并分析了高校品牌建设与创新产出的关系,研究结果显示高校可以从加强高校领导人的政治关联、营建高校与地方政府的良好关系、选择优质客户进行交易以及积极争取第三方评价机构的正向评价四个维度来构建高校品牌,优质的高校品牌资源将正向影响高校的产出绩效,而且高校品牌营建的四个维度之间存在着一定的逻辑关系,需要协同推进才能实现高的产出绩效.     

杭州发展网上证券交易的对策思考

作为中国证券业未来发展方向的网上证券交易，在杭州虽然已取得了一些成绩，但整体水平落后于一些地方性券商，针对目前杭州在开展网上证券业务中存在的问题，提出了以下对策，加强网络的安全防范建设，实行“券商＋IT公司＋银行”的新型经营模式，创新营销策略，进行品牌攻略。     

A process of students and their instructor developing a final closed-book mathematics exam

This article describes a study, from a Canadian technical institute's upgrading mathematics course, where students played a role in developing the final closed-book exam that they sat. The study involved a process where students developed practice exams and solutions keys, students sat each other's practice exams, students evaluated classmates' solutions to the practice exams, and finally the instructor used questions from the practice exams to develop the ‘live’ final exam. Phenomenography is used to analyse interview data and report students' experiences. Through the results, claims are made that students experienced deep approaches to learning and worked as partners in learning, teaching and assessment during the process of developing the final exam with their instructor.     

社会身份对品牌评价影响的实证研究

基于社会身份的消费者行为研究是社会学、心理学和营销学融合视角的新兴领域,社会身份对品牌评价具有影响,但这种影响存在作用条件.通过对社会身份、品牌评价、产品涉入度,动机等核心概念进行梳理研究,利用实验法实证研究了社会身份对品牌评价的作用关系,并引入产品涉入度作为调节变量,动机作为中介变量.研究结果发现,社会身份的激发可以显著提高消费者的品牌评价,且产品涉入度越高,显著性越大,产品涉入度低,则提高作用不显著.动机在社会身份和品牌评价关系中具有部分中介作用.     

2015年全国研究生数学建模竞赛F题综述

叙述了2015年全国研究生数学建模竞赛F题"旅游路线规划问题"的命题背景和目的,分析了本赛题的建模及求解思路,对评阅中发现的问题进行了综述,最后叙述了本赛题还需继续思考的问题.     

不同消费者对品牌代言传播的多种反应关系研究

伴随着市场经济模式的根本改变,商业传播的方式、策略等也发生着质的变化。当然,最具冲击力的,应该是它对社会的消费文化、消费理念以及企业的经营理念、服务理念等社会层面和文化层面上的巨大影响。因此,如何通过不同类型的品牌代言人提升品牌资产成为了学术界和企业界关注的一个焦点。为此,通过对"90后"在校大学生进行调查,针对实证研究结论,最终提出适应"90后"在校大学生群体的品牌代言传播策略建议。