自由立体显示器上立体鼠标的实现及其应用研究

提出了一种在三维自由立体显示器的基础上,依据人眼双目视差的原理,使普通鼠标实现立体鼠标显现效果的方法.在此基础上,进一步提出了当立体鼠标指向屏幕上任意点时的实际位置深度信息的计算方法,并通过实验验证了该位置深度信息计算的正确性.理论分析和实验研究表明,提出的立体鼠标实现和位置计算方法可实现将当今的三维自由立体显示器应用于数字摄影测量系统.     

Low Threshold and High Conversion Efficiency Nanosecond Mid-Infrared KTA OPO

Based on a Type II non-critically phase-matched KTA crystal, a low-threshold and high conversion efficiency mid-infrared optical parametric oscillator （OPO） pumped by a diode-end-pumped Nd：YVO4 laser is demonstrated. The OPO threshold is only 0.825W. The maximum output power of 435mW at 3.47μm is achieved with the repetition rate of 30kHz, corresponding to an optical-to-optical conversion efficiency of 4.4%. The photon conversion efficiency is as high as about 64%. The pulse width is 3.5ns with a peak power of 4kW for the maximum output power.     

Design of Infrared Inverted Telephoto-Optical System with Double-Layer Harmonic Diffractive Element

A double-layer harmonic diffractive element （HDE） structure is investigated and the optimization procedure is given based on the equation of diffraction efficiency of the double-layer diffractive optical element. A new infrared double-layer inverted telephoto-optical system with an HDE is designed, which can work in the mid- and farinfrared wavebands. The diffraction efficiency of the system at each wavelength in the designed two wavebands is larger than 90%, which improves the image contrast and the imaging quality significantly.     

家用电热器具的加热原理

电热器具是将电能转换为热能的器具．将电能转换成热能与燃烧煤炭、石油、天然气等燃料获取热能的方法相比，具有清洁卫生污染少、容易调控温度、安全可靠、使用方便和热效率高等优点，因此电热器具目前广泛应用于工业及家庭，已成为人们生活中不可缺少的日常用具．如电熨斗、电饭锅、电磁炉、电热水器、空间加热器、电热毯、远红外线电暖炉等等．其加热方法则是：利用焦耳热的电阻加热、利用电磁感应产生的涡流热量的感应加热、利用高频磁场产生的分子摩擦热量的电介质加热、利用红外线照射的红外线加热．     

红外线探测实验的改进

“红外线探测实验”旨在通过红外热效应来揭示红外线的真实存在．该实验因为真实地再现了历史上英国天文学家赫胥尔(W．Herschel)发现红外线的实验探究经历，能拓展学生的知识视野，培养其探究能力和科学精神．所以频频出现在各种新课标教材中，如人教版教材八年级(上)和苏科版教材八年级(上)．但在实际教学中，教师们普遍反映，即使将温度计的玻璃泡涂黑，     

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阐述了ITER遥控运输车初步结构和工作状况,运用有限元方法对其进行模态分析并在地震载荷作用下进行加速度反应谱分析,验证了遥控运输车在地震情况下的安全性并给下一步的优化设计和实验提供了参考数据。     

无线遥控活塞式多速率显示电磁炮演示仪

应用电磁学理论、机械力学以及电子技术自制了无线遥控活塞式多速率显示电磁炮演示仪.利用演示效果显著及安全性能可靠的塑料乒乓球作为炮弹,并在仪器的电磁线圈内装一可滑动的金属制动活塞,使活塞在电磁线圈内的运动无线可控,且可显示其活塞的速率、炮弹的初速率.该仪器可以用于电磁学部分的演示实验教学和特性分析.     

Determination of Active Components in a Natural Herb with Near Infrared Spectroscopy Based on Artificial Neural Networks

The non-linear relationships between the contents of ginsenoside Rg1, Rb2, Rd and Panax notoginseng saponins(PNS) in Panax notoginseng root herb and the near infrared(NIR) diffuse reflectance spectra of the herb were established by means of artificial neural networks(ANNs). Four three-layered perception feed-for-ward networks were trained with an error back-propagation algorithm. The significant principal components of the NIR spectral data matrix were utilized as the input of the networks. The networks architecture and parameters were selected so as to offer less prediction errors. Relative prediction errors for Rg1, Rb1, Rd and PNS obtained with the optimum ANN models were 8.99%, 6.54%, 8.29%, and 5.17%, respectively, which were superior to those obtained with PLSR methods. It is verified that ANN is a suitable approach to model this complex non-linearity. The developed method is fast, non-destructive and accurate and it provides a new efficient approach for determining the active components in the complex system of natural herbs.     

创新"船"奇梦想启航——基于STEAM理念的无线电波发射和接收教学

基于STEAM教育理念,以项目式的学习展开教学,以制造无线遥控船模为例,将碎片化物理知识整合为一体,利用所学物理科学知识,以技术和数学为工具,通过工程设计贯穿整个项目,感受其中蕴含的艺术美,弘扬科学精神,体现中国文化和中国智慧,培养学生的创新意识及解决问题的能力,为适应未来社会发展所需要的创新型人才做准备.     

基于上位机控制的电焊机遥控操作系统的设计

针对目前采油厂普遍使用的直流电焊机在焊接过程中,需要根据金属质地的不同改变焊接电流大小,同时受空间限制,特殊工况下手工操作不便等问题,对基于上位机控制的电焊机遥控调整焊接电流外加装置进行了研究,提出了一种基于低功耗微处理器MSP430F149控制的无线射频遥控调流装置,该装置由电焊机控制端(下位机)和手持遥控端(上位机)两部分组成.手持遥控调流装置由微处理器MSP430F149,无线通信模块(nRF905),按键电路,显示模块,稳压电源及外围电路组成.电焊机控制装置由微处理器MSP430F149,直流电焊机,环境参数传感器,无线通信模块,稳压电源,有线无线转换开关及电流调节模块组成。实现了直流电焊机工作参数的远程调控,能够节约焊接施工的时间和人力成本,扩展焊机的使用场合。