美学原则在活动义齿制作过程中的应用     

马丽  郑燕  曲晓娟 《大连大学学报》2006,27(6):90-93

义齿不仅是一件符合生物力学的实用工具,还应是一件富于美的工艺品.运用形式美学法则指导义齿修复工作,则能更完美地完成义齿修复体.作者根据自身的临床工作经验,并结合国内外学者在此领域的研究成果,从人工牙的选择、排列及固位体和基托制作等方面,对义齿在制作过程中所应用到的美学原则和操作方法加以总结和归纳,便于更好的指导临床工作.  相似文献   

现代企业实施ERP系统产品选择策略     

郭梅  李霞  尹平娥 《教育技术导刊》2006,(17)

论述了企业实施ERP系统产品时的策略选择。要注意检验软件的成熟度,考察成功用户的数量,调研用户满意度,衡量客户化工作量,计算二次开发工作量,保证软件升级周期,考虑用户接受培训的工作量,最后还要选择优秀的服务商来保证产品的正常运行。  相似文献   

高校图书馆部主任的选用与培养   总被引：3，自引：0，他引：3  

龙飞鹏 《保山师专学报》2004,23(1):87-89

依据信息网络时代高校图书馆管理的实际,阐述了图书馆部主任应具有的能力、素质.强调在使用他们的同时为其营造一个尽快成长和成才的良好环境,这样才能促成高校图书馆队伍建设的发展,才能更好地为学校的教学科研服务.  相似文献   

The effect of 14 weeks of vitamin D3 supplementation on antimicrobial peptides and proteins in athletes     

Cheng-Shiun He  William D. Fraser  Jonathan Tang  Kirsty Brown  Stephen Renwick  Jay Rudland-Thomas 《Journal of sports sciences》2016,34(1):67-74

Heavy training is associated with increased respiratory infection risk and antimicrobial proteins are important in defence against oral and respiratory tract infections. We examined the effect of 14 weeks of vitamin D₃ supplementation (5000 IU/day) on the resting plasma cathelicidin concentration and the salivary secretion rates of secretory immunoglobulin A (SIgA), cathelicidin, lactoferrin and lysozyme in athletes during a winter training period. Blood and saliva were obtained at the start of the study from 39 healthy men who were randomly allocated to vitamin D₃ supplement or placebo. Blood samples were also collected at the end of the study; saliva samples were collected after 7 and 14 weeks. Plasma total 25(OH)D concentration increased by 130% in the vitamin D₃ group and decreased by 43% in the placebo group (both P = 0.001). The percentage change of plasma cathelicidin concentration in the vitamin D₃ group was higher than in the placebo group (P = 0.025). Only in the vitamin D₃ group, the saliva SIgA and cathelicidin secretion rates increased over time (both P = 0.03). A daily 5000 IU vitamin D₃ supplement has a beneficial effect in up-regulating the expression of SIgA and cathelicidin in athletes during a winter training period, which could improve resistance to respiratory infections.  相似文献   

Differences in pedalling technique between road cyclists of different competitive levels     

Juan García-López  Sergio Díez-Leal  Ana Ogueta-Alday  Josu Larrazabal  José A. Rodríguez-Marroyo 《Journal of sports sciences》2016,34(17):1619-1626

The purpose of this study was to compare the pedalling technique in road cyclists of different competitive levels. Eleven professional, thirteen elite and fourteen club cyclists were assessed at the beginning of their competition season. Cyclists’ anthropometric characteristics and bike measurements were recorded. Three sets of pedalling (200, 250 and 300 W) on a cycle ergometer that simulated their habitual cycling posture were performed at a constant cadence (~90 rpm), while kinetic and kinematic variables were registered. The results showed no differences on the main anthropometric variables and bike measurements. Professional cyclists obtained higher positive impulse proportion (1.5–3.3% and P < 0.05), mainly due to a lower resistive torque during the upstroke (15.4–28.7% and P < 0.05). They also showed a higher ankle range of movement (ROM, 1.1–4.0° and P < 0.05). Significant correlations (P < 0.05) were found between the cyclists’ body mass and the kinetic variables of pedalling: positive impulse proportion (r = ?0.59 to ?0.61), minimum (r = ?0.59 to ?0.63) and maximum torques (r = 0.35–0.47). In conclusion, professional cyclists had better pedalling technique than elite and club cyclists, because they opted for enhancing pulling force at the recovery phase to sustain the same power output. This technique depended on cycling experience and level of expertise.  相似文献   

冬泳运动对中老年人身体成分的影响分析     

姜燕  武俸羽 《辽宁体育科技》2016,(1):75-77

对齐齐哈尔市冬泳协会的116名冬泳爱好者进行身体成分测试。结果显示：长期进行冬泳运动,可以改善中老年人的身体成分,降低体脂百分比和肥胖发生率,提高身体素质,对预防心血管疾病及老年性骨质疏松具有积极意义。  相似文献   

广义马氏过程及其熵率     

张景晓  连秀国  李光芹  姜曰华 《临沂师范学院学报》2004,26(3):26-28

讨论了k步广义马氏过程及其时间不变性和平稳性，给出了熵率的两种定义，说明了其等价性，还给出了平稳的广义马氏链熵率的计算公式．  相似文献   

食物浓度及低浓度镉对水螅种群动态的影响     

鲍官柢  胡好远 《安徽教育学院学报》2005,23(3):91-93

在温度为20士1℃、自然光照(光照强度约为301x,L : D=14 : 10)条件下,分别以浓度为0.25ind/ml、0.5ind/ml、1.0ind/ml、2.0ind/ml枝角类(Cladocemans)为食物及在1.0ind/ml食物浓度下,应用单个体培养法及群体累积培养法研究了食物浓度及低浓度镉离子(0mg/l(对照组)、0.01mg/l、0.05mg/1)对水螅种群动态的影响.实验表明,食物浓度对水螅种群增长有一定影响,在较高食物浓度下水螅的种群增长率、净增长率普遍提高,而镉子浓度对水螅种群增长有显著影响.在较高离子浓度下,水螅种群增长率、净增长率较大,而世代时间相对缩短.  相似文献   

直接序列扩频系统抗干扰性能研究   总被引：2，自引：0，他引：2  

康丽  邵玉斌 《赣南师范学院学报》2006,27(6):55-57

本文从直接序列扩烦的处理增益及误码率方面,借助Matlab仿真算法,分析了其在几种主要干扰下的抗干扰性能,并指出了几种有利于提高系统抗干扰能力的方法．  相似文献   

用稳态近似法推导反应速度方程时应注意的一个问题     

胡跃华 《赣南师范学院学报》1990,(Z1)

用稳态近似法推导反应的速度方程时,最后所导出的速度方程有时会出现由不不同数值而组成的系数。针对这个问题,本文指出了两种避免出现该问题的方法。  相似文献