Research on the Term of Service

服务期是用人单位和劳动者在劳动合同之外通过平等协商而达成的协议，是对劳动关系双方权利义务的调整和重新安排，涉及到用人单位和劳动者之间的博弈，即是用人单位限制劳动者择业自由权的体现，也是劳动者合法权益得到尊重和保护的体现。因此，科学、合理的服务期制度不仅可以鼓励用人单位对劳动者进行人力资本投资，也有利于劳动关系的和谐稳定。在《劳动合同法》制定之前，地方立法对服务期制度进行了广泛的尝试，且设置多有不同，取得了一些效果，也产生了较多问题。《劳动合同法》首次作为全国性立法对服务期制度进行了明确和规范。但受到传统社会法理念的限制，《劳动合同法》既想发挥服务期制度的功能和优势，又想充分保护劳动者的择业自由...Although not included in an employment contract, the term of service, reached by an employer and a employee through equal consultation, is new arrangements and adjustments of rights and obligations in employment relationship. A term of service is a game between an employer and a employee where the former wants to limit the career liberty of employee and the latter wants to protect his legal benefi...学位：法律硕士院系专业：法学院法律系_法律硕士(JM)学号：1302009115037

浅谈我国失业保险法律制度的完善

1999年《失业保险条例》颁布实施以来,在保障失业人员基本生活、促进失业人员再就业、维护社会稳定等方面发挥了重要作用。随着经济、社会的不断发展和变化,十多年前的失业保险制度设计已经难以适应当前改革发展的现实需要。《社会保险法》在一定程度上对失业保险制度进行了完善,但仍存在不足。本文试图在研究我国失业保险制度存在问题的基础上,并结合国外失业保险制度的发展改革经验,提出对我国失业保险法律制度进行完善的建议

The Method Research of Integrated Robot Grinding Technology for Custom Femoral Prostheses

影响非骨水泥假体长期稳定的因素是无菌松动,微动和应力遮蔽通过破坏假体近端的骨整合导致假体的无菌松动,而微动和应力遮蔽与假体的力传递相关。定制式假体的设计模型来源于病人股骨的CT数据,它建立了有限元模型与手术模型的一致性,通过有限元模型上的力传递分析,优化假体的设计和假体与髓腔的匹配,控制手术后假体上的力传递,避免假体近端大的微动和应力遮蔽而破坏假体在髓腔中的初期稳定性,促进假体近端的骨整合。针对定制式假体,发展一种新型的集成技术,形成定制式假体设计、有限元分析和制造一体化,特别是采用CAD/CAM/Robot集成技术加工定制式假体,在建立CAM软件空间各单元与机器人工作空间对应各单元一致性基础上,提高了假体的制造精度。仿真和实验结果表明,有限元分析方法可以控制假体上的力传递,机器人磨削柄体的误差小于0.9mm。The reason that affects long-term stability of cementless femoral prosthesis is aseptic loosening, micromotion and stress shielding that are related to the force transfer of prosthesis can destroy the osseointegration of proximal prosthesis and make the prosthesis to form aseptic loosening in the femur cavity. The design model of cnstomfemoral prosthesis is from the CT reconstruction of patient femur, the fit of prosthesis and femoral cavity at designperiod of the prosthesis is same the fit at surgical operation period, then the results of finite element analysis at design period can be used to control the force transfer of prosthesis at postoperative, the improper micromotion and stress shielding of proximal prosthesis that destroy the primary stability of prosthesis in femoral cavity can be avoided and the osseointegration of proximal prosthesis can form. In this paper, we develop the new technology to integrate the design, finite element analysis and manufacture of the custom prosthesis, specially, we use the CAD/CAM/robot integration method to machine custom prosthesis. On the basis of establishing consistency of each module in CAM software space and robot working space, the manufacturing precision of the prosthesis was improved. In the conclusion, the finite element analysis of the custom prosthesis can control the force transfer of prosthesis and the milling errors of custom prosthesis is less than 0.9 mm

Design, manufacture and experimental analysis of cementless hip prosthesis in torsional force transmission

背景:人体股骨髓腔具有扭转的解剖结构,如果股骨髓腔的扭转结构被复制到假体的柄体上,当假体插入髓腔并在假体上加载力时,假体将加载的力转换成股骨髓腔对柄体的扭转力并将该力传递到股骨近端。目的:优化股骨近端的力传递,避免假体近端应力遮挡。方法:利用人股骨标本的CT图片重建股骨髓腔的3D模型,将该3D模型作为柄体的设计模型。将定制式柄体模型与标准假体的近端模型拼合,形成定制式假体。采用机器人磨削技术制作定制式假体,并将定制式假体与标本股骨髓腔匹配。利用有限元仿真和实验方法分析假体上加载的力与假体近端扭转微动的关系。结果与结论:仿真和实验结果表明,股骨髓腔与柄体匹配的扭转结构,可有效地将假体上加载力以扭转力的形式传递到股骨近端,假体近端的扭转微动与柄体的微动相关,而柄体的微动可通过改变柄体与髓腔的匹配区大小得到控制。BACKGROUND: Human femur medullary cavity has torsional anatomic structure. If the femur medullary cavity's torsional structure is copied to the stem of the prosthesis, the prosthesis will transform the force loaded to torque between femur medullary cavity and prosthesis stem, and the torque is transmitted to the proximal femur when the prosthesis is inserted in the medullary cavity and load force on the prosthesis. OBJECTIVE: To optimize the force transmission of the proximal femur, and to avoid the stress shielding at the proximal end of the prosthesis. METHODS: We reconstructed a three-dimensional(3D) model of the femoral canal with the CT images of specimen femur and took the 3D model as the design model for prosthesis stem. The customized stem model and the proximal model of standard prosthesis could be put together to form customized prosthesis. We took advantage of robot grinding technology to manufacture the customized prosthesis, and matched it with specimen femur canal. Finite element analysis simulation and experimental methods were used to analyze the relationship between the loading force on the prosthesis and the micromotion of proximal end of the prosthesis. RESULTS AND CONCLUSION: The simulation and experimental results showed that the torsional structure matching by femoral canal and stem could effectively transmit the force on the prosthesis to the proximal end of the prosthesis in the form of torque. The torsional fretting of the proximal end of the prosthesis was related to the movement of the handle body. However, stem micromotion can be controlled by varying the matching size between stem and medullary cavity

关联成像技术的研究现状及展望

关联成像,又称为鬼成像,可以通过没有接触物体这一路径的信息来重构出物体的图像。根据光源性质的不同,关联成像可以划分为量子关联成像、经典光(热光)关联成像和计算成像。自1995年Pittman..

基于Chebyshev混沌扩谱序列的MC-CDMA系统的峰均功率比研究

峰均功率比(PAPR)是多载波码分多址 (MC-CDMA)系统的一个重要指标, OFDM多载波调制技术虽然可以提高MC-CDMA系统的数据传输率和抗干扰能力, 但是在系统的峰均功率比方面则存在着亟待解决的问题。本文利用Chebyshev混沌扩谱序列的伪随机、非周期、数量大和良好的相关特性,作为MC-CDMA系统上行信道的扩谱序列,以改善输出信号的峰均功率比。分析和仿真结果表明在保持较低多址接入干扰的同时,还可以大大降低发射信号的峰均功率比

Optimal Chaotic Binary Spreading Sequences for Asynchronous CDMA System

【中文文摘】为了扩展适合异步CDMA系统的扩谱序列,提高系统的性能,利用混沌序列的类随机、理想的自相关和互相关、易于产生并且数量多的特性,来生成适合异步码分多址系统的混沌扩谱序列。根据异步DS-CDMA系统的模型,分析适合异步CDMA系统的最优混沌扩谱序列的性能优点,提出选择和构造最优二进制混沌扩谱序列的关键指标,并与传统的伪随机序列(如Gold序列)进行数值仿真比较。结果表明应用最优混沌扩谱序列可以增加15%的系统容量。 【英文文摘】In order to expand the group of sequences and improve the system performance of asynchronous CDMA communication, study on the characteristic of optimal chaotic sequence is conducted. On this base, some criteria on selecting spreading sequences are proposed and implemented to generate binary chaotic spreading sequences with optimal performance. Numerical simulation and statistical analysis show that these sequences are more adapted for asynchronous CDMA system than conventional Gold sequence.国家自然科学基金资助项目(60076015);福建省自然科学基金资助项目(A0010019); 福建省高新技术项

Effect of tea polyphenols on the retrogradation of sweet potato starch

淀粉老化会导致淀粉基食品变硬、弹性减小,严重缩短这些产品的货架期。本文通过X-射线衍射、质构分析、色泽分析和傅立叶变换红外光谱等方法检测甘薯淀粉样品在长期储存过程中(80d)的结构和特性变化,研究茶多酚对甘薯淀粉的抗老化效果。纯甘薯淀粉在放置80d之后,硬度接近初始硬度的30倍,而加入9WT.%茶多酚之后,硬度增大趋势得到明显的抑制,80d之后淀粉胶体硬度不足初始硬度的4倍。实验结果显示,茶多酚可抑制甘薯淀粉形成结晶结构,延缓其结晶过程,从而降低甘薯淀粉胶体的硬度,减小胶体的硬度和色泽变化。这说明茶多酚可有效抑制甘薯淀粉的老化。Retrogradation in cooked starch based products significantly shortens the shelf life of these products as they become firm and less elastic during storage.In this work,the effect of tea polyphenols( TPs) on the retrogradation of sweet potato starch during long- term storage( 80d) was evaluated by characterizing sweet potato starch sample using X- ray diffraction( XRD),texture profile analysis( TPA),color analysis,and Fourier transform infrared spectroscopy( FT- IR).After storage for 80 d,the hardness of pure sweet potato starch increased to about30 times of initial hardness.While for sweet potato starch with 9wt.% TPs,the normalized hardness was less than 4.The experimental results showed that TPs retard the recrystallization of starch,resulting in decrease in the hardness of sweet potato starch gel.The variations of hardness and color of the sweet potato starch gel were also limited by the addition of TPs.The results suggested that the retrogradation of sweet potato starch was inhibited by TPs

异步DS-CDMA最优混沌序列集的性能分析

为了获得异步DS-CDMA系统的最优扩谱序列,给出了一套用来选取混沌二值序列的优化准则。基于这一优化准则,我们从Chebyshev映射生成的混沌序列中选取并构造出最优混沌二值序列集合。利用该集合作为异步DS-CDMA系统的扩谱序列,所得到的系统仿真结果符合最优扩谱序列的理论分析值,因此可以被认为是异步DS-CDMA系统的一个最优扩谱序列集合