关于Moore-Penrose逆的若干性质

给出了Moore-Penrose逆的定义及Moore-Penrose逆的几个特殊性质.     

传统民间艺术在女明星礼服设计中的运用

女明星礼服设计集实用性和艺术观赏性为一体,而当今传统民间艺术形成的宝贵文化和独特风格,对现代礼服设计有着越来越大的影响。很多优秀的设计师融合传统民间艺术和现代艺术理念,其作品不但大大提升了明星的知名度,同时也使人们满足了追求艺术的心理需要。     

从乾卦视角看企业战略管理原则

《易经》被称为众经之首,其内容包罗万象,囊括天地,其中蕴含着丰富的管理思想,这是我们进行管理学研究的宝贵财富。战略管理是企业管理的重要方面,是管理者在企业生产、经营、财务、人力资源、企业监管等方面的总体把握和规划。乾卦则是《易经》首卦,占有重要的地位,对于当代企业战略管理具有重要价值。     

Effects of load on ground reaction force and lower limb kinematics during concentric squats

The purpose of this study was to examine the effects of external load on vertical ground reaction force, and linear and angular kinematics, during squats. Eight males aged 22.1?±?0.8 years performed maximal concentric squats using loads ranging from 7 to 70% of one-repetition maximum on a force plate while linear barbell velocity and the angular kinematics of the hip, knee and ankle were recorded. Maximum, average and angle-specific values were recorded. The ground reaction force ranged from 1.67?±?0.20 to 3.21?±?0.29 times body weight and increased significantly as external load increased (P?<?0.05). Bar linear velocity ranged from 0.54?±?0.11 to 2.50?±?0.50?m?·?s^?1 and decreased significantly with increasing external load (P?<?0.05). Hip, knee and ankle angles at maximum ground reaction force were affected by external load (P?<?0.05). The force?–?barbell velocity curves were fitted using linear models with coefficients (r ²) ranging from 0.59 to 0.96. The results suggest that maximal force exertion during squat exercises is not achieved at the same position of the lower body as external load is increased. In contrast, joint velocity coordination does not change as load is increased. The force?–?velocity relationship was linear and independent from the set of data used for its determination.     

Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity,and participant´s sex

ABSTRACT

We assessed the intraocular pressure (IOP) behaviour during a 1-minute period of isometric physical effort and the immediate 1-minute of recovery in the mid-thigh clean pull and squat exercises at three different intensities. Twenty physically active individuals performed the isometric mid-thigh clean pull and squat exercises at three intensities (0% [low-intensity], 25% [medium-intensity] and 50% [high-intensity] of the maximum isometric force). IOP was semi-continuously measured by rebound tonometry. There was a statistically significant effect of exercise intensity on IOP (p < 0.001, ?_p² = 0.416), observing that IOP increments were positively associated with exercise intensity. The mid-thigh clean pull and squat exercises did not demonstrate differences (p = 0.510), and also, no differences were observed between men and women (p = 0.683). The IOP changes during the isometric physical effort showed a positive linear behaviour in all conditions (r = 0.70 to 0.96). IOP returned to baseline levels after 8 seconds of recovery. Our data showed a progressive and instantaneous IOP increment during isometric exercise, which was positively associated with exercise intensity. IOP changes were independent on the type of exercise and participant´s sex. After exercise, IOP rapidly (≈ 8 seconds) returned to baseline levels.     

阻容元件温漂对低通有源滤波器的影响

滤波器是一个频率选择部件,它可以通过某些频率而抑制或衰减另外一些频率的信号,该文介绍了模拟滤波器的发展及类型,通过对模拟滤波器的设计,对低通有源滤波器采用的阻容元件随温度变化特性进行分析及模拟仿真,提出如何解决阻容元件温漂对频率响应及产品灵敏度精度的影响。     

关于《诗经》研究的一些浅见——《诗经通译新诠》商兑之二

本文就黄典诚教授的《诗经通译新诠》提出一些浅见 ,并从释义、艺术手法、群经注释三方面进行了说明     

论略高等教育自学考试与普通高等教育渊源关系

当前，构成我国高等教育的两大系统是全日制普通高等教育和成人高等教育，而高等教育自学考试却不属于这两大系统。弄清和理顺高等教育自学考试与全日制普通高等教育之间的价值关系，有利于二优势互补，从而推动我国高等教育事业的更快发展。     

浅谈不同需求下营销策略的运用

市场营销是“有效益的满足需求”。然而，从静态上来看，不同的时间、不同的地点、不同的行业，市场的需求状况各不相同；从动态上来看，市场的需求又是每时每刻发生着变化。因此，企业只有从消费的实际需求出发，正确地运用市场营销策略，才能在市场中立于不败之地，否则企业就会面临困境，进而走向倒闭。     

浅论沈湘的声乐教学艺术

通过对沈湘先生教学艺术的一部分即“从没有方法——到有了方法——再消灭方法”的理论。从两种不同的情况出发,结合沈湘先生的教学实例与作的实际教学经验,阐明了声乐教学中的否定之否定规律。