Research and Development of a New Type of Walking Aids for Lower Limbs

目的设计一种新型助行器，要求能够分散受力点，减少上半身体部分局部受力以尽量避免腋部并发症与不适感，同时要求结构简单，制造方便。方法应用Solidwork软件进行结构设计：主体略呈长“T”形，主要包括腋托、手把、小腿支撑、拐杖脚等部分。主体及各主要部分受力情况采用ABAQUS软件进行有限元分析。结果采用普通304不锈钢管材制造的助行器符合强度要求。结论设计的新型助行器具有结构简单、使用方便、安全可靠、操作流程易懂的特点，可满足不同状态下的需求和不同高度人体的使用。研制出的新型下肢助行器，可为进一步通过基于下肢受力点设计出助行器提供相关参考。Objective To design a new type of walking aids, which can disperse force, decrease the stress on the upper exmnerty, reduce complications and discomfort of axilla, and has the advantages of simple structure and convenient manufacture. Methods The structure was design with Solidwork software： the main part looked a little like ＂T＂, including the axillary support part, handle part, leg support part, crutch feet part and so on. The force of the major structure and the main parts was analyzed by ABAQU--an engineering simulation finite element analysis software. Results The walking aids made of ordinary 304 stainless steel tube met the mechanical requirements. Conclusions The new type of designed walking aids has the features of simple structure, convenient use, safety and reliability, and easy operation process, which can meet the requirements in different states and the use by people with different heights. The new type of designed walking aids for lower limbs can further provide relevant reference for new kinds of walking aids to design on the basis of force points of lower limbs.厦门市科技局科技惠民计划项目（3502220154017

Fabrication and bacterial adhesion of metal dry electrode with surface microstructure arrays

为开发出高性能生物医用干式电极,提出了利用激光微铣-重铸加工方法,实现了表面具有微结构阵列特征的新型金属干式电极的制造成形。在分析电极表面微观形; 貌的基础上,研究了电极表面的润湿性能,并重点研究了扫描间距、扫描速度和扫描次数等加工参数对大肠杆菌粘附性能的影响规律。研究结果表明:在一定工艺参; 数条件下所加工出具有微结构阵列特征的电极的接触角可达150°以上,表现出超疏水的特性。在不同扫描间隙和扫描次数条件下加工出的电极对大肠杆菌的粘附; 性能具有较大影响,在选择0.1; mm扫描间隙时,电极表面粘附的大肠杆菌数量最少,适当增加扫描次数,也能够有效地减少电极表面大肠杆菌的粘结,从而发挥较好的抗菌效果。通过改变扫描速; 度加工出的电极则对大肠杆菌的粘附性能影响不大。To develop a high performance biomedical dry electrode, the laser; micromilling-recasting technology is used to fabricate the metal dry; electrode with surface micostructure arrays. Based on the analysis of; the micro morphology of the electrode surface, the wettability of the; electrode surface is discussed, and then the influence of laser; processing parameters such as scanning spacing, scanning speed and scan; times on the adhesion performance of Escherichia coli is further; investigated. The results show that the contact angle of metal dry; electrode with surface microstructure arrays fabricated with reasonable; laser processing parameter can reach more than 150° and show the; superhydrophobic characteristics. The adhesion performance of; escherichia coli of electrode is changed greatly with different scanning; spacing and scan times. When the 0.1 mm scanning spacing is selected,; the least amount of escherichia coli is found on the surface of; electrode. With the increasing scan times, the adhesion amount of; escherichia coli can be reduced. However, the scanned speed has little; effect on the adhesion performance of escherichia coli for metal dry; electrode.国家自然科学基金面上项目; 厦门市科技计划项目; 厦门市科技惠民项

Three-dimensional finite element analysis of hip joint replacement

目的本文建立股骨髋关节置换有限元模型,并进行了静力学模拟计算,寻求假体的材料属性对髋关节置换后产生的的影响。方法运用逆向工程与有限元的基本概念和理论,采用医学专用的建模软件mimics读取原始的股骨CT图片的dicom格式,完成股骨三维重建,然后根据股骨髓腔几何解剖状态应用CAD软件设计个性股骨假体。在ansys中对两个模型进行有限元装配,进行接触耦合分析!结果建立了精确的股骨模型和设计了个性假体。利用MIMICS基于灰度值进行赋材质,实现股骨有限元模型材料正确的非均匀及各向异性描述。成功模拟了三种假体材料置换后股骨的应力。结论三种材料中复合材料假体更接近人体生理环境,减弱了假体的应力遮挡,有利于力由假体传到到股骨上。为改进人工髋关节的设计、置换和提高人工髋关节寿命提供了一些有益的依据。研究结果表明这种假体设计和分析方法更为合理、可靠。Objectives In this paper,the finite element model of femur hip replacement is established,and the corre-sponding static analysis is carried out to get the effect which the different material properties impacts on hip replacement.Methods based on the basic conception and theory of Reverse engineering and finite element,the DICOM format of orig-inal CT data is read by MIMICS to reconstruct the femur 3D model.Based on the geometric anatomical state of hip med-ulla cavity,the individual femur prosthesis is designed by CAD software.Two models are assembled in the ansys to put up joint coupling analysis!Results the femur model is accurately constructed and the individual prosthesis is designed.The material assignment is applied by MIMICS based on gray scale;the finite element model material of femur is realized in unevenness and anisotropism.The femur stress is simulated after three different materials of the femur hip replacement.Conclusion the prosthesis by CFR/PSF is better in line with human physiological environment than the others,the stress shelter is weaken,it is better for stress to transfer the prosthesis to femur.The research offers some helpful bases for the design,replacement and life of artificial hip joint.And the results reveal that the method is more reasonable and reliable.福建省高等学校新世纪优秀人才支持计划资

荒漠地区公路建设环境保护与生态恢复技术

《荒漠地区公路建设环境保护与生态恢复技术》项目组通过资料收集、理论分析、室内外试验和工程实践,系统开展了荒漠地区公路建设与自然环境相互影响、荒漠地区公路建设的生态环境敏感性、荒漠地区公路建设环境保护与生态恢复技术集成以及典型区域公路建设环保与生态建设示范四方面研究,取得了如下主要创新性成果： 1．分析揭示了荒漠地区公路与环境的相互影响关系,建立了公路建设环境保护与生态恢复的基础平台。 2. 提出了荒漠地区公路路域生态功能重要性、环境敏感性和景观类型区划的原则与方法,建立了相应的区划体系。 3．构建了荒漠地区公路路域生态修复技术评价指标体系和评价数学模型。 4．提出了荒漠..

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies