旅游酒店员工流失问题及对策探析——以昆明锦江大酒店为例

受我国传统观念、行业特性、员工自身等因素的制约,旅游酒店员工流失率一直居高不下,由此所带来的负面影响也一直困扰着酒店管理者。针对这种情况,文章以昆明锦江大酒店为例,通过对员工流失原因及其影响的分析,提出了相应的对策措施。     

油樟组织培养污染率控制试验

以油樟带芽茎段为材料,在初代培养中进行了不同表面消毒方式、不同年龄、不同季节的外植体污染率试验。结果表明,Ca(ClO)2和HgCl2的配合使用有利于污染率的降低;当年生枝条的污染率低于二年生枝条。3月采集的材料污染率低于10月。这为增加油樟组培中无菌苗的得率提供了指导,也对其它木本植物组培的研究有一定的意义。     

浅谈人民币汇率改革

当前,随着经济全球化、一体化进程的加快,中国市场经济的逐步完善,中国经济持续增长,美日欧要求中国人民币汇率升值的呼声越来越强,人民币升值也将带来一系列的影响.中国政府必将权衡利弊,通盘考虑,在合适时机,按照主动性、可控性和渐进性的原则进一步改革人民币汇率制度和汇率形成机制,形成面向市场、更具有弹性的汇率制度,使人民币汇率维持在合理、均衡的水平上,有利于国内经济和世界经济的发展.     

蔗糖转化实验的研究

本文通过实验事实说明蔗糖转化实验的理想实验条件、速率常数随催化剂量、温度变化的关系及实验数据处理方法．     

EWMA算法在无线通信协议速率选择中的应用

如何根据无线环境的变化实时选择一个可靠的发送速率,进而保证数据传输的可靠性是无线通信研究的热点。针对传统累积和平均法（Cumulative Sum Average,CUSUMA）由于计算机存储数据位数的有限性可能导致的数据值超过计算机最大数据类型表示范围,进而造成统计数据丢失的问题,提出基于指数加权移动平均（Exponentially Weighted Moving Average, EWMA）算法,计算对应速率下的数据发送成功率,并根据计算出的成功率实现动态速率选择。该算法可用于解决通用平均值算法导致的因数据过大造成的统计数据丢失问题。     

运动训练对心率变异的影响

[目的]探讨运动对HRV的影响.[方法]运用MCA-3C心脏综合信息检测仪,分别对采集的512个心电信号的时域参数和频域参数进行心率变异(HRV)分析.[结果]运动训练使P50、SD、HF.H、脉压和R-R间期显著提高P<0.05;心率显著降低P<0.05;TP、LF.H、LF.A等参数值增加;LF.S、HF.A、HFS及LF/HF无显著差异,P>0.05.[结论]运动训练使HRV的时域参数显著增加.     

安徽省低利用率文献区域合作储存图书馆建设研究

储存图书馆的建设在我国方兴未艾,区域合作储存图书馆的重要作用已得到广泛认可与证实。本文首先论述国内外区域合作储存图书馆建设现状,然后分析建设安徽省区域合作储存图书馆的必要性,最后提出构建安徽省区域合作储存图书馆的具体策略。     

Simultaneous measurement of back and front foot ground reaction forces during the same delivery stride of the fast-medium bowler

Six male cricket bowlers (mean - s x ¥ : age 23.5 - 1.3 years; height 1.83 - 0.04 m; body weight 826 - 20 N) performed their typical bowling action at a set of stumps positioned at standard pitch length (20.1 m). A specially designed force platform rig allowed the correct positioning of two force platforms to be achieved beneath an outdoor polyflex runway (0.017 m depth) for each player's delivery stride pattern. For the back foot, the peak vertical ground reaction force was 1.95 - 0.08 kN (2.37 - 0.14 BW) and the braking force was 0.77 - 0.12 kN (0.94 - 0.16 BW). For the front foot, the peak vertical force was 4.80 - 0.92 kN (5.75 - 0.98 BW) and the braking force was 2.93 - 0.56 kN (3.54 - 0.67 BW). The mean peak vertical loading rate for front foot contact was 205 - 52.8 kN·s -1 (249 - 64 BW·s -1 ) with mean values ranging from 81 to 446 kN·s -1 (98 to 540 BW·s-1). The range for back foot contact was much smaller, 25-70 kN·s -1 (30-85 BW·s -1 ), with a mean of 41.7 - 7.10 kN·s -1 (50.6 - 8.6 BW·s -1 ). Mean peak impact occurred 24 ms after touchdown for the back foot and 16 ms after touchdown for the front foot. At impact, mean peak loading rates were greater for the front foot at 246 kN·s -1 (298 BW·s -1 ), with a range of 80-483 kN·s -1 (98-534 BW·s -1 ), than for the back foot at 65 kN·s -1 (79 BW·s -1 ), with a range of 40-84 kN·s -1 (49-110 BW·s -1 ).     

Heart rate and match analysis in pre-pubescent soccer players

The aim of this study was to compare match analysis (using video recordings) and the physiological load (heart rate measured every 5s, blood lactate measured after the warm-up, first half and second half) of six 11-year-old soccer players during official games of eleven-a-side on a regular-sized pitch (100×65m) and of seven-a-side on a smaller pitch (60×40m). In both games, heart rate exceeded 170 beats·min-1 84% of the time, while blood lactate ranged from 1.4 to 8.1 mmol·l-1 . No significant differences were recorded for the physiological parameters. For both matches, walking comprised 38% of total time, running 55%, inactivity 3% and jumping 3%. Although there were no significant differences between halves or matches, running for less than 10s was 10% more frequent in the seven-a-side game. In the seven-a-side game, there were significantly more passes and significantly fewer tackles, suggesting that seven-a-side matches played on smaller pitches may be more suitable for pre-pubescent soccer players.     

掺铒聚合物光纤放大特性的理论分析

本文主要利用三能级系统的速率方程对掺铒聚合物光纤激光放大器的放大特性进行数值分析.从理论上模拟得到所研究光纤的最佳长度,并分析了在不同参数情况下,信号增益与泵浦功率的相互关系.