独立音频解码七喜H777

说到七喜（HEDY），我们都对它的IT产品以及代理的硬件产品非常熟悉，但是说到七喜的手机，可能市场知名度就没那么高，确实，七喜在2006年8月份刚刚拿到手机牌照，但是在相对较短的时间内推出了多款手机新品，完全可以看出七喜对手机产品的重视，而且在发布的手机产品中，七喜涉及的种类非常广泛，既有流行滑盖设计，也有时尚直板风格，可见七喜的雄心，而H777是七喜旗下首歌主打音乐牌的机型，由于七喜本身在MP3播放器领域有着多年经验，而且作为实力雄厚的代理商，七喜在控制价格方面很有一套，如此一来，自然很让人期待H777的表现。[编者按]     

On the mechanics of functional asymmetry in bipedal walking

This paper uses two symmetrical models, the passive compass-gait biped and a five-link 3-D biped, to computationally investigate the cause and function of gait asymmetry. We show that for a range of slope angles during passive 2-D walking and mass distributions during controlled 3-D walking, these models have asymmetric walking patterns between the left and right legs due to the phenomenon of spontaneous symmetry-breaking. In both cases a stable asymmetric family of gaits emerges from a symmetric family of gaits as the total energy increases (e.g., fast speeds). The ground reaction forces of each leg reflect different roles, roughly corresponding to support, propulsion, and motion control as proposed by the hypothesis of functional asymmetry in able-bodied human walking. These results suggest that body mechanics, independent of neurophysiological mechanisms such as leg dominance, may contribute to able-bodied gait asymmetry.     

光影魅力：TCL M530

在追求个性的今天，手机已经成为彰显性格，凸显自身风格的重要饰品，除功能配置外，各手机厂商都非常重视手机的工业设计，国内厂商现在也越来越重视设计的重要性，特别一些大厂，他们在其他行业有着丰富的设计与制造经验，在手机领域，他们从业时间也比较长，经验丰富，对于国内的市场环境也着充分的体会和认识，TCL M530是最近国产手机中一款以设计为重要卖点的产品，它出色地吸取了巧克力系手机的特别，并有所发挥，出色的外形设计给人留下了深刻的印象。[编者按]     

炫耀马甲三星E498

相信有很多朋友和笔者一样,被近来三星的机海战术搞得很有些审美疲劳。虽说这样做极大地丰富了自身的产品线,但是从另外一个角度来讲,这样会让 更多的消费者,在面对一些功能、外形只有些许变动,但是型号、价格差异却很大 的产品时感到手足无措。好在三星的一堆新品中也不乏稍有新意的作品,好歹也 让消费者在众多产品中可以有点个性的选择。[编者按]     

Perturbation parameters associated with nonlinear responses of the head at small amplitudes

The head-neck system has multiple degrees of freedom in both its control and response characteristics, but is often modeled as a single joint mechanical system. In this study, we have attempted to quantify the perturbation parameters that would elicit nonlinear responses in a single degree-of-freedom neuromechanical system at small amplitudes and velocities of perturbation. Twelve healthy young adults seated on a linear sled randomly received anterior-posterior sinusoidal translations with +/-15 mm and +/-25 mm peak displacements at 0.81, 1.76, and 2.25 Hz. Head angular velocity and angular position data were examined using a nonlinear phase-plane analysis. Poincare sections of the phase plane were computed and Lyapunov exponents calculated to measure divergence (chaotic behavior) or convergence (stable behavior) of system dynamics. Variability of head angular position and velocity across the entire phase plot was compared to that of the Poincare sections to quantify spatial-temporal irregularity. Multiple equilibrium points and positive Lyapunov exponents revealed chaotic behavior at 0.81 Hz at both amplitudes whereas responses at 1.76 and 2.25 Hz exhibited periodic oscillations, clustered phase points, and negative Lyapunov exponents. However, intersubject variability increased at the lowest frequency and a few subjects presented chaotic behavior at all frequencies. An inverted pendulum with position and velocity threshold nonlinearity was adopted as a simplistic model of the head and neck. Simulations with the model resulted in features similar to those observed in the experimental data. Our principal finding was that increasing the perturbation amplitude had a stabilizing effect on the behavior across frequencies. Nonlinear behaviors observed at the lowest stimulus frequency might be attributed to fluctuations in control between the multiple sensory inputs. Although this study has not conclusively pointed toward any single mechanism as responsible for the responses observed, it has revealed clear directions for further investigation. To examine if changing the sensory modalities would elicit a significant change in the nonlinear behaviors observed here, further experiments that target a patient population with some sort of sensory deficit are warranted.     

缤纷色彩诺基亚2626

各大手机厂商对于低端市场的重视程度越来越高,低端产品也逐渐摆脱了以往功能单薄、外观简陋、低质低价的形象,以更加实用的功能、更加丰富的 造型满足消费者的需求。诺基亚在低端市场的功力是国外几大手机巨头中最强大 的,对于低端产品的投入程度也相当高。新款的诺基亚2626便是以庞大的学生用 户群以及年轻消费者为销售对象,延续了诺基亚简单易用的人性化操作的一款多 彩入门机型。[编者按]