基于手机的可视化远程家电控制研究

介绍了一种利用手机实现可视化远程家电控制的系统和方法.系统分为服务器、家庭控制中心设备和手机三个部分,它们之间通过TCP/IP连接.在传统家电控制技术的基础上,将视频技术引入手机远程控制过程.用户可以在手机屏幕上对看到的设备对象进行自由的操控,操控结果可见.     

Solar Energy Collectors with Tunable Transmission

A new type of “smart” window is proposed that makes use of fluorescent dye guests in a liquid‐crystal host sandwiched between glass panels. The dye absorbs a variable amount of light depending on its orientation, and re‐emits this light, of which a significant fraction is trapped by total internal reflection at the glass–air interface, and becomes concentrated along the edges. Such a device could both generate electricity via an attached photovoltaic as well as allow user control of the amount of transmitted light. By applying a voltage across the cell, absorption could be varied 31%, while the usable light output only varied 11% due to the increased efficiency of light collection at homeotropic dye orientation.     

光学显微镜自动聚焦取窗方法研究

针对全自动光学显微镜系统中,传统聚焦窗口选择方法易受图像内容分布、杂质、噪声等因素干扰的问题,提出一种根据内容像素变化量选择聚焦窗口的方法。该方法将灰度差像素数量与边缘像素数量加权作为内容像素数量,据此衡量失焦模糊状态下子块内容含量并划分聚焦窗口,减少杂质与噪声对取窗过程的影响;用降采样后图像各子块内容含量估计原图像内容分布信息,降低图像滤波、梯度计算过程的计算量;使用局部标准差与锐利边缘像素数量联合检测焦平面图像的失焦模糊区域,有效排除玻片杂质造成的焦平面误判。与传统的显微镜自动聚焦取窗方法相比,对内容丰富程度和分布状况不同的显微图像序列,该方法均能获取有效的聚焦窗口,像素梯度均值更高,所得的评价曲线局部极值极少,尖锐性好,因此该方法的成功率高,鲁棒性更强。     

利用安卓智能手机快速检测透明有色溶液的浓度

利用安卓智能手机的CMOS传感器并配合安卓手机软件Color Grab来获取不同浓度透明有色溶液的L*、a*、b*值,并将相应数据导入Excel处理后得到相应的色差值,通过建立色差值与浓度之间的数值关系,再利用智能手机采集待测透明有色溶液的色差值,即可得到待测溶液的浓度。系统经过定标后测量的过程即不再需要标准溶液。     

Al窗Ag靶微型透射式X射线管模拟与性能分析

微型透射式X射线管广泛应用于能量色散X射线荧光分析领域,具有体积小、功耗低、X射线发射效率高等特点,可作为手持式X射线荧光分析仪器的激发源。目前常用铍(Be)作为出射窗材料,成本高,而且有毒性。同时为减少低能散射射线,在射线管前端放置铝(Al)作为过滤窗。本文拟采用Al为微型透射式X射线管出射窗材料,透射高能射线,屏蔽低能散射射线,降低制作成本和难度。文中采用蒙特卡洛模拟软件MCNP5模拟计算不同银(Ag)靶厚度和Al窗厚度的X射线管输出谱。结果表明,Al窗对低能射线的屏蔽作用强于对高能射线的屏蔽作用,在Al窗厚度超过1.5 mm时,低能射线完全被屏蔽,高能射线有部分透射。通过和已有研究成果[1,5]对比分析,在Ag靶厚度为2 μm,Al窗厚度为0.8 mm时,低能射线所占的比例仅为0.087 8%,高能射线产生率为0.002 73%,既能有效屏蔽低能射线,又能保证高能射线较高的出射率,能够满足野外现场能量色散 X射线荧光分析的需要。     

Design and fabrication of ultra broadband infrared antireflection hard coatings on ZnSe in the range from 2 to 16 μm

In conventional infrared multilayer antireflection coatings (MLAR) materials of fluoride and chalcogenide types are used, which are disadvantaged due to their low mechanical strength and poor stability against humidity and environmental impacts. In this paper, we show that high performance ultra broadband and hard infrared multilayer antireflection coatings on ZnSe substrates in the wavelength range from 2 to 16 μm can be designed and fabricated. Diamond-like carbon (DLC) hard coating as a mechanical and environmental protection layer was proposed and deposited onto MLAR surfaces (MLAR + DLC) using a pulsed vacuum arc ion deposition technique. The thickness of the high optical quality DLC can be optimized in the design simulation to achieve a practically best antireflection and surface protection performance. We show that a germanium thin film (15 nm) between the MLAR and DLC surfaces can be used as a transition layer for optical and material match. The average transmission of the fabricated MLAR+DLC surfaces was 93.1% in the wavelength range between 2 and 16 μm. The peak transmission was about 97.6%, close to the simulated values. The durability and stability against mechanical impacts and environmental tests was improved significantly compared with the conventional infrared windows.     

The adoption and use of mobile phone in rural China: A case study of Hubei,China

This paper examines the behavioral and psychological factors influencing the adoption and use of mobile phone in rural China. Based on the diffusion of innovations and perceived needs theory, this research, through a case study of Hubei, China, supports the theoretical model that both behavioral and psychological factors can predict Chinese rural residents’ adoption and use of mobile phone. Psychological factors, however, play a weaker role in rural residents’ adoption and use of mobile phone than do behavioral factors. Moreover, behavioral factors can significantly predict some of the psychological factors. By adding behavioral factors into the theoretical model, this study supplements the perceived needs theory and extends it from urban setting to rural setting. Implications of the findings have been discussed.     

D类音频功放在移动电话中的应用研究

D类功放比传统的模拟功放效率高,体积小,功耗低,越来越多被用在移动电话中.文中介绍了基于脉宽调制技术的D类功率放大器EMT7026的原理和EMT7026在移动电话中的应用.通过在功放前端和后端加入滤波电路的方法降低了功放的POP噪声,实验结果显示功放输出功率为1.2W时失真度THD N小于1%,实现了移动电话的低功耗和高音质的设计思想.     

对手机充电过程智能化控制的探讨

手机电池的充电过程是手机使用,设计中应考虑的重要环节,在该过程中实施智能化控制,对延长手机的待机时间、延缓电池的使用寿命具有决定性的作用,文中结合手机电池充电的典型电路,对手机电池常见的平滑直流充电、带续流功能的平滑直流充电、PWM脉冲宽度调制充电等方式中涉及到的快充、慢充、饱和识别的智能化控制作了理论上的论述和剖析,对进一步优化手机充电电路有较强的参考和借鉴价值.     

Commwarrior worm propagation model for smart phone networks

Commwarrior worm is capable of spreading through both Bluetooth and multimedia messaging service （MMS） in smart phone networks. According to the propagation characteristics of Bluetooth and MMS, we built the susceptibleexposed-infected-recovered-dormancy （SEIRD） model for the Bluetooth and MMS hybrid spread mode and performed the stability analysis. The simulation results show good correlation with our theoretical analysis and demonstrate the effectiveness of this dynamic propagation model. On the basis of the SEIRD model, we further discuss at length the influence of the propagation parameters such as user gather density in groups, moving velocity of smart phone, the time for worm to replicate itself, and other interrelated parameters on the propagation of the virus. On the basis of these analytical and simulation results, some feasible control strategies will be proposed to restrain the spread of mobile worm such as commwarrior on smart phone network.