经济订货量基本模型的一种扩展及其数学推导     

伍刚  熊于宁 《成都师专学报》2006,25(4):83-84

目前使用的经济订货量基本模型的缺陷是未考虑商业折扣。据此，本文在考虑有商业折扣的情况下对经济订货量的基本模型进行了扩展，并推导出了具有较好实用性的简明结论。  相似文献   

BIODEX在大腿、膝关节伤后功能诊断及康复中的应用   总被引：1，自引：0，他引：1  

杨静宜  赖柳明 《北京体育大学学报》1993,(2)

42名有大腿前、后群肌肉拉伤或膝关节急、慢性损伤史的运动员为受试者。用BIODEX 多关节等速测力及康复系统测定膝关节屈、伸肌群肌力,取60(°)/s 向心、离心及240(°)/s 向心收缩的最大力矩(PT)等指标,用“评价表格”进行分析评定,并对力矩曲线加以分析。初步认为,力矩曲线异常具有功能诊断参考价值,并可用于选拔运动员时及时发现伤情。参照BIODEX 测试结果,有针对性的进行康复锻炼,可收到良好效果。  相似文献   

黑龙江省图书馆的延伸服务实践   总被引：2，自引：2，他引：0  

王妍 《图书馆学研究》2008,(8)

本文介绍了黑龙江省图书馆近年来尤其是新馆全面正式开馆以来在延伸服务方面进行的探索和尝试,以及开展这些延伸服务的体会。  相似文献   

论图书馆文化服务功能的开发与延伸   总被引：2，自引：0，他引：2  

杨岚 《图书与情报》2008,(4)

文章以推进文化创新、增强文化发展活力为宗旨,以延伸图书馆服务的广度与深度、提高公共文化服务能力为指导思想,从图书馆公共服务范畴吸纳“社会工作”职能和手段的重要意义,图书馆加强“文化形象”建设是图书馆事业科学发展的重要保证,图书馆创办“文化活动”是开发公共信息空间新功能的重要举措,图书馆“文化产业”的巨大市场空间是增长社会效益的重要领域等四个方面,阐述了图书馆创新文化服务功能的构想。  相似文献   

论数字图书馆与传统图书馆的关系   总被引：1，自引：0，他引：1  

景万福 《晋图学刊》2005,(6):32-34

本文分析了数字图书馆与传统图书馆的关系,提出了数字图书馆是以传统图书馆为基础的,是传统图书馆发展的一个新阶段。  相似文献   

武术概念的历史演进与定义          下载免费PDF全文

谢群喜 《河北体育学院学报》2016,30(1):84-87

运用文献资料法和逻辑分析法,对“武术”一词的起源以及不同历史时期下武术概念的演进进行了梳理.利用逻辑学原理对武术概念的内涵和外延进行分析,进而对武术概念内涵的四种属性进行阐述,采用“属加种差法”确定武术的“邻近属概念”和“种差”.运用“性质种差法”确定武术的特有属性,并以此为划分依据,运用“二分法”对武术概念的外延进行划分.以期为武术理论体系的完善提供理论参考.  相似文献   

跆拳道后旋踢技术动作的运动学特征分析          下载免费PDF全文

杨小芳 《河北体育学院学报》2016,30(3):81-85

采用三维高速摄像技术和运动生物力学原理,对后旋踢技术身体重心移动、动作所用时间、踝关节角度、膝关节角度和髋关节角度的运动学特征进行比较分析,得出结论:踢击腿在离地瞬间身体重心要快速向回旋方向移动;踢击腿膝关节最大程度弯曲,以缩短动作时间、加快踢击速度;踢击腿髋关节只有最大程度地弯曲,弯曲的膝关节才能快速展开;踢击腿的髋关节最大程度弯曲再打开时,踝关节能快速鞭打;支撑腿弯曲后在踢击腿踢出的瞬间,髋关节开始伸展,将对打击高度产生影响;踢击腿膝关节和髋关节最大程度弯曲时能增加击打力度.  相似文献   

膝关节贴扎技术的临床应用研究进展          下载免费PDF全文

姜敏  陈文华  余波 《体育科研》2017,(5):94-97

膝关节疾病易发多见，贴扎技术作为主要的非侵入性治疗技术也已广泛应用于临床。结合各类膝关节受累疾病总结了近年贴扎相关的临床应用研究进展，为贴扎技术改善膝关节各类主诉尤其是运动功能障碍方面提供一定参考。  相似文献   

Efficacy of massage on muscle soreness,perceived recovery,physiological restoration and physical performance in male bodybuilders     

Mehdi Kargarfard  Eddie T.C. Lam  Ardalan Shariat  Ina Shaw  Brandon S. Shaw  Shamsul B.M. Tamrin 《Journal of sports sciences》2016,34(10):959-965

It is believed that sport massage after intensive exercise might improve power and perceptual recovery in athletes. However, few studies have been done in this area. This study aimed to examine the effect of massage on the performance of bodybuilders. Thirty experienced male bodybuilders were randomly assigned to either a massage group (n = 15) or a control group (n = 15). Both groups performed five repetition sets at 75–77% of 1RM of knee extensor and flexor muscle groups. The massage group then received a 30-min massage after the exercise protocol while the control group maintained their normal passive recovery. Criteria under investigation included: plasma creatine kinase (CK) level, agility test, vertical jump test, isometric torque test, and perception of soreness. All variables were measured over 6 time periods: baseline, immediately after the DOMS inducing protocol, right after the massage, and 24, 48, and 72 h after the massage. Both groups showed significant (P < .001) decreases in jumping, agility performance, and isometric torque, but significant (P < .001) increases in CK and muscle soreness levels. The massage group in general demonstrated a better recovery rate. As such, a post-exercise massage session can improve the exercise performance and recovery rate in male bodybuilders after intensive exercise.  相似文献   

The effect of limb dominance on lower limb functional performance – a systematic review     

Timothy M. McGrath  Gordon Waddington  Jennie M. Scarvell  Nick B. Ball  Rob Creer  Kevin Woods 《Journal of sports sciences》2016,34(4):289-302

Lower limb dominance (or lateral preference) could potentially effect functional performance. Clinicians are often asked to make judgements as to when a patient has sufficiently “recovered” from an injury, typically using strength and dynamic performance outcome measures. The primary purpose of this study was to systematically review the literature in relation to limb dominance within active adult populations and discuss some limitations to current methods and relate this to current clinical practice. A search of MEDLINE and CINAHL and EMBASE databases and reference lists of those articles identified was performed. Eleven articles were selected for meta-analysis. There was no statistical effect of limb dominance for any of the functional tests: isokinetic quadriceps and hamstring tests, hamstring:quadriceps ratios, single-leg hop for distance, single-leg vertical jump and vertical ground reaction force following a single-leg vertical jump. Pooled symmetry values varied from 94.6% to 99.6% across the tests, above the clinically accepted benchmark of 90% used in clinical practice. Although the results of this study must be used with discretion, asymmetries in the tasks described in this analysis should be viewed as undesirable and remedied accordingly. Further research is needed to quantify asymmetries, particularly in relation to sport-specific contexts.  相似文献