Characterization and use of an optical fiber interferometer for measurement of the electric wind

An optical fiber interferometer of the Mach-Zehnder type has proved to be a convenient and accurate method for measuring the electric wind in the active region of a corona discharge. The technique relies on the cooling effect of the wind on a small heated region of one arm of the interferometer, which has been remotely heated with an infrared CO(2) laser beam. Wind speeds of up to 5.5 m s(-1) have been measured near the generation region, and by the use of a mesh electrode, the wind has been detected on the axis up to 0.5 m away from the gap. A number of characterization experiments that show the interferometer to be a useful diagnostic tool in the quantitative analysis of the CO(2) laser beam have also been carried out, and good agreement between experimental results and theoretical calculations based on a simple heat-power balance equation for the fiber exists.     

Musculoskeletal disorders among female and male air traffic controllers performing identical and demanding computer work

Operators with identical, demanding computer work (90 female and 97 male air traffic controllers) were found to have high prevalences of disorders (assessed by questionnaire and physical examination) in neck, shoulders and upper back. In spite of the identical work, the women displayed higher prevalences than the men (e.g. neck diagnoses 21% vs. 4%). Disorders in elbows, wrists and hands were less common, with similar rates in both genders. Generally, the psychosocial work environment (assessed by questionnaire) was found to be good, but with large inter-individual variation. Women experienced lower decision latitude than men, particularly regarding influence and freedom at work, but perceived higher social support. Physically, the work was characterized by relatively low angular velocities of upper arms (measured by inclinometry) and wrists (right: < 1 degrees/s during 19% of time, measuring by goniometry), dynamic muscular activities and high time fractions of rest in the trapezius and forearm extensor muscles (measuring by electromyography). There were only minor differences between the genders.     

石墨层间化合物稳定性的研究

用喇曼散射方法观察了HClO_4、HNO_3、H_2SO_4—石墨层间化合物(GIC)的阶次状态随时间的变化,采用a面及c面入射观察。到HClO_4—GIC的阶次变化过程中ClO_4~-的溢出现象,据此认为层间化合物的阶次不稳定是由于插入的离子与石墨层间的分子力作用较弱。     

custom习惯了的习惯

“可以走过来和我一起喝咖啡吗?” “Sorry,一个人独享咖啡,我已经习惯了。” 凌晨,在Berkery Cafe的靠椅上,KoKo回完了短信,合上手机,瞟了一眼对面角落里那个男人的身影,便又合上双眸,蜷缩起身体,庸懒得像只猫咪。玻璃杯里的咖啡在2小时前就已经不见了踪影,KoKo从来不喜欢慢慢吮吸流质的感觉,坐在这里她只是在品尝着空气中弥漫的淡淡的咖啡香味,仅此而已。     

Neurotrophic control of ovarian development

Substantial evidence now exists indicating that the neurotrophins, a family of growth factors required for the survival, development, and differentiation of various neuronal populations of the nervous system, are also important for the development of nonneuronal tissues. Such a function was first suggested by studies showing the presence of high-affinity neurotrophin receptors in a variety of nonneuronal tissues including those of the cardiovascular, endocrine, immune, and reproductive systems. Within the latter, the gonads appear to be a preferential site of neurotrophin action as suggested by the presence in the mammalian ovary of at least four of the five known neurotrophins and all of the neurotrophin receptors thus far identified. While the various functions that the neurotrophins may have in the ovary are still being elucidated, it is now clear that in addition to recruiting the ovarian innervation, they play a direct role in the regulation of two different maturational periods that are critical for the acquisition of female reproductive function: early follicular development and ovulation. Neurotrophins facilitate the development of newly formed follicles by promoting the initial differentiation and the subsequent growth of primordial follicles. These actions appear to be related to the ability of neurotrophins to sustain the proliferation of both mesenchymal and granulosa cells, and to induce the synthesis of follicle stimulating hormone (FSH) receptors. At the time of the first ovulation, neurotrophins contribute to the ovulatory cascade by increasing prostaglandin E(2) release, reducing gap junction communication, and inducing cell proliferation within the thecal compartment of preovulatory follicles.     

数字化生活——唇彩乐盒

这个产品给我们的第一印象就感觉像MM们用的唇彩，不过个头大了些，整体构造颇简洁，机身采用金属皮革漆，以情侣机型为宣传卖点推出艳的红，蓝色两款，视觉效果挺不错。液晶显示的字体清晰，字号大，以滚动的方式显示歌词，观看很轻松。     

特征加权模糊感知器算法

本文提出了一种改进的模糊感知器算法,基本思想源于在学习中观察在旋转、位移和尺寸变换下,由矩不变量构成的特征矢量其各分量的变化是不同的。用方差对特征矢量进行加权,使变化小的特征分量在分类中起主要作用。模拟结果表明:新算法较原算法在分类中更为有效。