A method to align the coordinate system of accelerometers to the axes of a human body: The depitch algorithm

One of the key problems in accelerometry based gait analyses is that it may not be possible to attach an accelerometer to the lower trunk so that its axes are perfectly aligned to the axes of the subject. In this paper we will present an algorithm that was designed to virtually align the axes of the accelerometer to the axes of the subject during walking sections. This algorithm is based on a physically reasonable approach and built for measurements in unsupervised settings, where the test persons are applying the sensors by themselves. For evaluation purposes we conducted a study with 6 healthy subjects and measured their gait with a manually aligned and a skewed accelerometer attached to the subject's lower trunk. After applying the algorithm the intra-axis correlation of both sensors was on average 0.89±0.1 with a mean absolute error of 0.05g. We concluded that the algorithm was able to adjust the skewed sensor node virtually to the coordinate system of the subject.     

改进多目标粒子群优化算法在间歇蒸煮过程中的应用

对间歇蒸煮过程进行了分析建模,分别建立了纸浆质量、污染指标和制浆成本三个数学模型,从而构成多目标优化问题。在典型的多目标优化算法NSGA-Ⅱ的基础上,采用粒子群算法的消息传递机制来进行求解,新算法在全局极值的选择上借鉴了分布估计算法的概率抽样思想来产生新的gbest。最后就该算法进行了仿真计算并和实际参数进行了对比,说明实际生产在能耗和污染两项指标上确实存在改进的余地。     

高校思想政治理论课教学状况分析及对策探讨

高校思想政治理论课（过去称为“两课”）是大学生思想政治教育的主渠道，是帮助大学生树立正确世界观、人生观、价值观的重要途径，体现了社会主义大学的本质要求。多年来，高校思想政治理论课在发挥大学生思想政治教育的主渠道作用方面是值得肯定的，为培养品学兼优的合格大学生作出了积极的贡献。然而，毋庸讳言，大学生对思想政治理论课的学习兴趣不浓、学习热情不高、学习主动性不够以及思想政治理论课的课堂秩序欠佳、课堂气氛沉闷、课堂效果不理想等问题，带有一定的普遍性，一些大学生认为思想政治理论课枯燥无味，是讲大道理、空对空，在他们心目中，思想政治理论课远不如专业课和英语、计算机等课程那么重要，相当一部分学生上课是为了考勤，学习是为了考试，应考是为了“60分”。由此可见，改革思想政治理论课教学改革已迫在眉睫。     

A charge coupled device camera with electron decelerator for intermediate voltage electron microscopy

Electron microscopists are increasingly turning to intermediate voltage electron microscopes (IVEMs) operating at 300-400 kV for a wide range of studies. They are also increasingly taking advantage of slow-scan charge coupled device (CCD) cameras, which have become widely used on electron microscopes. Under some conditions, CCDs provide an improvement in data quality over photographic film, as well as the many advantages of direct digital readout. However, CCD performance is seriously degraded on IVEMs compared to the more conventional 100 kV microscopes. In order to increase the efficiency and quality of data recording on IVEMs, we have developed a CCD camera system in which the electrons are decelerated to below 100 kV before impacting the camera, resulting in greatly improved performance in both signal quality and resolution compared to other CCDs used in electron microscopy. These improvements will allow high-quality image and diffraction data to be collected directly with the CCD, enabling improvements in data collection for applications including high-resolution electron crystallography, single particle reconstruction of protein structures, tomographic studies of cell ultrastructure, and remote microscope operation. This approach will enable us to use even larger format CCD chips that are being developed with smaller pixels.     

Lead-free multilayer piezoelectric transformer

In this article, a multilayer piezoelectric transformer based on lead-free Mn-doped 0.94(Bi(12)Na(12))TiO(3)-0.06BaTiO(3) ceramics is presented. This piezoelectric transformer, with a multilayered construction in the thickness direction, is 8.3 mm long, 8.3 mm wide, and 2.3 mm thick. It operates in the second thickness extensional vibration mode. For a temperature rise of 20 degrees C, the transformer has an output power of >0.3 W. With a matching load resistance of 10 Omega, its maximum efficiency approaches 81.5%, and the maximum voltage gain is 0.14. It has potential to be used in low voltage power supply units such as low power adapter and other electronic circuits.     

Bio-information scanning technology using an optical pick-up head

We have developed a low cost and a highly compact bio-chip detection technology by modifying a commercially available optical pick-up head for CD/DVD. The highly parallel and miniaturized hybridization assays are addressed by the fluorescence emitted by the DNA-chip using the optical pick-up head. The gap between the objective lens and the bio-chip is regulated by the focus servo during the detection of the fluorescence signal. High-resolution and high-speed scanning is effectively realized by this simple scanning system instead of utilizing high-precision mechanism. Regardless of achievement of effective detection mechanism, the technique of fluorescence detection can prove to be disadvantageous because of the low stability of the dyes with low S/N ratio and an expensive setup such as a PMT detector is always required for fluorescence detection. We propose, for the first time, a novel scanning scheme based on metal nanoparticles in combination with a bio-chip substrate having a phase change recording layer. We found that the phase change process is highly affected by the existence of the densely condensed metal nanoparticles on the phase change layer during the writing process of the pick-up head.     

铿锵玫瑰

摄影人都爱拍美女,他们用镜头诠释东方女性的含蓄、温柔、秀美,可以说拍摄美女是摄影的永恒主题.我也爱拍美女,但我更爱拍摄运动场上的美女,在赛场上,她们英姿飒爽的身影,坚强刚毅的性格,永不言败的拼搏,都会深深地打动每一个观众,每次看到这些奋战沙场的女运动员,我心中都有一种莫名的感叹和敬佩,在我的眼中,她们是世界上最美的女性,看到她们,我总会想起一个词:铿锵玫瑰.     

电极阻抗控制器对电弧炉冶炼电耗的影响

通过对电极阻抗控制器阻抗参数的研究,结合超高功率电弧炉变压器的特点,摸索出合适的供电级数,降低了冶炼电耗。     

视频资源在高校机器人概论课程教学中的探究

随着科学技术的进步和广大教师的不断探索,现代教育技术在教学过程中日益被广泛采用。视频资源以其生动、直观等优点,在高校机器人概论课程教学中具有重要地位。适度视频资源在机器人概论课程教学中的运用,可以整合教学资源,拓展并丰富课堂教学,有利于调动学生学习的主动性、积极性。但在机器人概论课程教学过程中,尚存在着一些需要解决的问题。为了扬长避短,发挥视频资源的优势,文章提出了视频资源在机器人概论课程教学中的改进策略。     

de Winter综合征临床资料分析

【摘要】 目的 分析总结de Winter 综合征临床诊疗特点。方法 入选2017年7月至2018年6月上海长海医院收治的急性心肌梗死（AMI）患者58例，根据急诊时心电图表现，分为de Winter综合征组（n=8）和前壁ST段抬高型心肌梗死（STEMI）组（n=50）。回顾性对比两组患者临床症状、实验室检查、治疗方式、门诊至球囊扩张时间、急性并发症等情况，分析总结de Winter 综合征患者临床特点。结果 两组间心电图预测罪犯血管、恶性心律失常发生率、门诊至球囊扩张时间比较，差异均有统计学意义（P＜0.05）。其余项目比较差异均无统计学意义。结论 de Winter 综合征心电图改变在预测罪犯血管上不及STEMI心电图改变敏感。de Winter 综合征患者易并发恶性心律失常。de Winter 综合征不易早期识别，应加强宣教，提高诊断能力。