基于蓝牙4.0的示波法电子血压计的设计与实现

平稳、健康的血压是人们维持机体正常新陈代谢的基本前提之一。近年来,随着人们生活方式、饮食习惯的改变,我国心血管疾病的发病率也随之不断上升,血压检测和便携式智能医疗设备逐渐成为了人们关注的重点,但目前市场上的电子血压计多以独立个体的形式存在,不具备数据传输功能,无法真正满足个性化医疗需求。因此,本文将以智能医疗中心为基础、将软件作为实现手段,探讨基于蓝牙4.0的示波法电子血压计的设计与实现,该血压计以示波法为原理,主要由Android端APP、下机位数据采集部分构成,通过蓝牙4.0进行数据传输。与传统电子血压计相比具有携带方便、测量便捷、稳定性强等优势,在家庭慢性病防控和血压检测中具有重要意义。     

基于Scrum的旅游类APP敏捷测试研究

随着旅游产业移动互联网大时代的到来,旅游类APP产品的数量正与日俱增,如何保障APP产品的质量成为其敏捷开发过程中不容忽视的重要环节.本文通过分析敏捷测试的研究现状,结合峨眉山智慧旅游APP项目阐述基于Scrum的敏捷测试实施流程,为敏捷测试在旅游类移动应用领域中的实践提供了参考.     

浅谈移动APP产品的用户研究方法

对于一款移动APP来说,无论是在开发的初期,还是在上线以后,都有必要对用户进行分析和研究。初期的研究可以帮助产品明确定位和功能需求,而后期的研究则可以帮助产品持续改进、更新。所以,产品经理和设计开发者都应将用户研究放在移动APP开发的重要位置。本文将对用户研究的意义和实质进行分析,并提出用户研究的几种方法。     

Android和Iphone的技术对比

iPhone和Android都是时下最火的智能终端操作系统,自诞生之日起便深刻的改变了行业的格局并展开了激烈的竞争.两者可谓棋逢对手将遇良才,本文试从技术的角度对二者进行了一番对比并分析其未来的发展趋势.     

Polymer membranes for high temperature proton exchange membrane fuel cell: Recent advances and challenges

Proton-exchange membrane fuel cells (PEMFCs) are considered to be a promising technology for efficient power generation in the 21st century. Currently, high temperature proton exchange membrane fuel cells (HT-PEMFC) offer several advantages, such as high proton conductivity, low permeability to fuel, low electro-osmotic drag coefficient, good chemical/thermal stability, good mechanical properties and low cost. Owing to the aforementioned features, high temperature proton exchange membrane fuel cells have been utilized more widely compared to low temperature proton exchange membrane fuel cells, which contain certain limitations, such as carbon monoxide poisoning, heat management, water leaching, etc. This review examines the inspiration for HT-PEMFC development, the technological constraints, and recent advances. Various classes of polymers, such as sulfonated hydrocarbon polymers, acid-base polymers and blend polymers, have been analyzed to fulfill the key requirements of high temperature operation of proton exchange membrane fuel cells (PEMFC). The effect of inorganic additives on the performance of HT-PEMFC has been scrutinized. A detailed discussion of the synthesis of polymer, membrane fabrication and physicochemical characterizations is provided. The proton conductivity and cell performance of the polymeric membranes can be improved by high temperature treatment. The mechanical and water retention properties have shown significant improvement., However, there is scope for further research from the perspective of achieving improvements in certain areas, such as optimizing the thermal and chemical stability of the polymer, acid management, and the integral interface between the electrode and membrane.     

用聚磷酸铵和联二脲来提高绝热层材料耐烧蚀性能的研究

论述了固体火箭发动机用绝热层材料的烧蚀过程以及提高耐蚀性能的功能添加剂的种类和作用,在以聚醚型聚氨酯为基体材料的绝热层配方中,添加聚磷酸铵和联二脲,测试其质量烧蚀率和线烧蚀率。试验结果表明,聚磷酸铵和联二脲都能够提高绝热层的耐烧蚀性能,尤其在聚磷酸铵和联二脲以及一定比例复配时效果最好。     

基于移情原理的家用急救APP架构探讨

目的大数据信息时代,智能家电成为研究热点并且逐渐进入消费者家庭中;通过移情设计的方法构建家用急救APP的交互构架,并且与智能监控摄像头相结合,更好地服务于大众。方法通过对市场上现有的急救类APP进行对比分析,以及对用户进行问卷访谈分析,了解人们对于急救知识的掌握程度以及急救类APP的使用情况,同时通过对用户"说"、"做"、"想"的移情研究,搭建家用急救APP交互构架软件,与现有的智能监控摄像头相互结合,从硬件和软件两方面初步构建APP框架。结论现有急救APP针对人群较为广泛,用户使用率低,用户对于急救类知识的了解和掌握程度较低,通过对用户"说"、"做"、"想"的移情研究,搭建新的急救APP交互架构,增加急救APP的丰富度,帮助用户学习急救类知识。     

Atmospheric-pressure plasma treatment on polystyrene for the photo-induced grafting polymerization of N-isopropylacrylamide

Atmospheric-pressure plasma (APP) treatment on polystyrene (PS) substrates by using N₂, He, and He/N₂ gases as working gas were investigated in this study, and photo-induced grafting polymerization of N-isopropylacrylamide (NIPAAm) on APP-treated PS substrates was subsequently applied. From the results of the wetting test, PS substrates treated by He-APP process represented a superior hydrophilicity with a contact angle of less than 10°. Surface analyses by X-ray photoelectron spectroscopy (XPS) indicated that functional groups of the carbonyl group (C = O) and carboxyl group (O-C-O) were generated on the surface of PS substrates after APP processes, which were most likely to enhance the surface hydrophilicity. Additionally, the thermosensitive poly-(NIPAAm) grafted on APP-treated PS substrates exhibited a hydrophilic surface (θ_H2O = 32°) below low critical soluble temperature (LCST), and converted into the hydrophobic surface (θ_H2O = 63°) as the ambient temperature exceeded LCST (> 33 °C). Our results suggest that the pre-treatment of PS substrates by APP process can increase the surface hydrophilicity and also be beneficial to the photo-induced grafting polymerization of NIPAAm on PS substrates.     

基于卡诺与质量功能展开的老年人手机APP设计研究

目的为有效识别老年用户的核心需求,提高老年人对手机用户界面操作的满意度。方法先根据卡诺模型分析老年人需求,明确不同需求的性质,进而确定其权重;再基于质量功能展开理论,将用户需求转化为设计要求,计算其重要度并确定关键设计要求;最后,依据关键设计要求,对设计方案进行规划与展开。结论将卡诺模型与质量功能展开相结合,以老年人手机音乐类APP界面设计为例进行研究,结果表明卡诺与质量功能展开方法可为以使用者为导向的用户界面设计提供参考。     

智能Agent技术在CAPP系统中的应用

智能Agent技术已经成为分布式人工智能领域的一个研究热点,吸引了越来越多研究者的关注.本文简单介绍了Agent、MAS的基本概念和CAPP系统的基本组成,在此基础上提出了一种基于MAS技术的CAPP系统体系结构,阐述了系统中各主要Agent的功能,探讨了系统的实现方法,同时实现了一个基于MAS的线切割自动编程系统,最后对基于MAS技术的CAPP系统与传统的CAPP系统的优缺点进行了比较.