基于舒适度的休息性座椅相关角度分析

针对休息座椅的舒适度,从人体血液流动状态、肌肉活动度、身体安定性(压力中心位移量)等项目出发,就座椅的相关角度进行了实验及分析。实验结果证明座面—椅背面夹角为120°,座面夹角0°～5°,同时脚踏板高度接近座高时,可使休息座椅的舒适度达到最佳化。从各角度条件出发,针对上半身支撑方式进行了有效分析。

休息性跟痛症的治疗

休息性跟痛症的治疗铁道部第十二工程局三处医院（０３００２４）范占林任君宇休息性跟痛症是临床上常见跟痛症的一种，引起的原因基本已经明确〔１〕，治疗上多采用跟骨穿刺减压。我们对近年来收治的跟痛症病例进行分析，对其中２６例休息性跟痛症进行双针穿刺，髓腔冲洗...

Inter- and intra-hemispheric EEG coherence in patients with mild cognitive impairment at rest and during working memory task

Objective： To assess functional relationship by calculating inter- and intra-hemispheric electroencephalography （EEG） coherence at rest and during a working memory task of patients with mild cognitive impairment （MCI）. Methods： The sample consisted of 69 subjects： 35 patients （n = 17 males, n = 18 females; 52-71 years old） and 34 normal controls （n = 17 males, n = 17 females; 51 -63 years old）. Mini-mental state examination （MMSE） of two groups revealed that the scores of MCI patients did not differ significantly from those of normal controls （P〉0.05）. In EEG recording, subjects were performed at rest and during working memory task. EEG signals from F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 electrode pairs are resulted from the inter-hemispheric action, and EEG signals from F3-C3, F4-C4, C3-P3, C4-P4, P3-O1, P4-O2, T5-C3, T6-C4, T5-P3 and T6-P4 electrode pairs are resulted from the intra-hemispheric action for delta （1.0-3.5 Hz）, theta （4.0-7.5 Hz）, alpha-1 （8.0-10.0 Hz）, alpha-2 （10.5-13.0 Hz）, beta-1 （13.5-18.0 Hz） and beta-2 （18.5-30.0 Hz） frequency bands. The influence of inter- and intra-hemispheric coherence on EEG activity with eyes closed was examined using fast Fourier transformation from the 16 sampled channels. Results： During working memory tasks, the inter- and intra-hemispheric EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group （P〈0.05）. However, there was no significant difference in inter- and intra-hemispheric EEG coherences between two groups at rest. Conclusion： Experimental results comprise evidence that MCI patients have higher degree of functional connectivity between hemispheres and in hemispheres during working condition, It suggests that MCI may be associated with compensatory processes during working memory tasks between hemispheres and in hemispheres. Moreover, failure of normal cortical connections may exist in MCI patients.

文化课内体育活动的开展

本文提出了课内体育活动的概念、具体做法,并阐述其产生的背景、存在之理论基础和应用之实际意义。

Coefficient of earth pressure at rest for normal,consolidated soils

In this study consecutive consolidated isotropically drained triaxial tests for the coefficient of earth pressure at rest(K_0) were carried out to investigate its rules of evolution as well as its strength characteristics for normal,consolidated saturated silt under high pressure.The tests results indicate that:1) for normal,consolidated saturated silt,K_0 values increase as the consolidation stress increases at high pressure levels,while the nonlinear characteristics of K_0 are inconspicuous compared to cohesive soils;2) the Jaky and Roscoe equations,used to calculate K_0,are only suitable for certain soils,but cannot represent these values for normal, consolidated saturated silt due to the variation in bilinear strength at high pressure;and 3) there are close relations between the nonlinear characteristics of K_0 and the void ratio,measured in the tests.Both share the same functional form while under pressure. Based on our experimental results,we developed an empirical linear model to interpret the rules of nonlinear variation for the coefficient of earth pressure at rest.

Characteristic of Drop Coalescence Resting on Liquid-Liquid Interface

The trajectory model of dispersed phase drops and the model of basic flow for drop motion between two inclined parallel plates are derived with the optimized calculation. The analytical results of direct numerical simulation indicate that the basic flow plays an important role in the drop coalescence on liquid-liquid interface. In the stratified two-phase flow field, the smaller droplets are difficult to drain the thin continuous film between the approaching droplets and bulk interfaces and eventually immerse into the trickling film to yield coalescence. They almost attain the velocity of their local surroundings. Moreover, the basic flow exerts a dominant influence on the motion of smaller droplet. The smaller droplets are easily entrained by the basic flow. On the contrary, the larger drop presents advantageous characteristics of coalescence due to its high velocity. The range of 0.3 mm < δR≤ 0.75 mm is the advantageous drop coalescence condition since the rapidly varied velocity and its first derivative theoretically cause the forces acting on a drop to become imbalanced. On the other hand, the thin layer of the continuous phase drained from the interval between the drops and trickling film should not be neglected in the calculation of shearing force since it is important for drop rotation. The drop rotation is an indispensable factor in coalescence.

The Dynamics of the Sociological Imagination

This article focuses on the factors that influence the dynamics of the sociological imagination. The author argues for the codependence of sociological theorizing, thinking, and imagination that are analyzed through the prism of the increasing complexity of social and cultural dynamics of the society, the accelerated complex development of human communities within the ＂arrow of time＂. He critically discusses the types of sociological imagination worked out by C. Wright Mills, P. Sztompka, S. Fuller, and U. Beck, and proposes his own model of sociological imagination in the form of a non-linear humanistic one that is based on the synthesis of social, hard and humane science. It deals with the acceleration of socio-cultural dynamics and glocal complexity, the integrity of the interdependent humanity, and synergetically takes into consideration paradoxical synthesis, breaks, risks, and dispersions of socium, its obiective, subjectively constructed, and virtual realities, searching for new forms of humanism, based on men＇s existential needs. It presupposes humane praxis--nowadays the world needs the passing over from technological to humane modernization that can be achieved due to a humanistic turn in sociology, its orientation on a non-linear humanistic sociological imagination.