低功耗双模态电子货架标签系统

为取代传统的纸质货架标签,提出一种低功耗的双模态电子货架标签系统。该系统基于物联网和无线传感器网络技术,针对低功耗目标,采用电泳式电子纸与蓝牙模块分别作为显示与通信模块。并将标签的运行状态分为工作与休眠两种状态,使其按照服务器指令按时切换运行状态,在满足低功耗的前提下实现标签状态汇报、内容更新等功能。从实验数据可见,该系统能基本满足应用场合的功能需求,相对传统的纸质标签具有明显的营运成本优势。     

热泵循环技术在热电厂的应用

介绍了热泵技术的原理,并结合某发电厂应用实例,说明了在电厂中可以采用热泵技术,循环水不再全部依靠冷却塔降温,而是部分作为各级热泵的低温热源,提高热电厂额定供热能力,减少了汽轮机的抽汽量,增加汽轮机的发电能力,提高系统整体能效。经过实际运行,各项指标达到了设计要求。热泵循环技术在热电厂中应用前景良好,具有推广价值。     

植入式集成磁耦合谐振无线电能传输分析

将植入式应用时无线电能传输的接收线圈与整流电路及其他功能电路集成在单芯片上,不仅可以满足植入式应用更小空间的要求,而且可以进一步提高可靠性和安全性。该文基于此应用,对磁耦合谐振无线电能传输系统建立了完整和简化的电路理论模型,分析结果显示,磁耦合谐振方式比传统的电感耦合方式具有更高的传输效率。     

提高中大口径杀爆弹威力的技术途径

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光伏电池的 MPPT 技术研究

针对光伏电池的最大功率点跟踪技术（ MPPT ）,对比分析了扰动观察法、电导增量法的技术原理和工程应用优缺点,为解决局部阴影情况下的多峰值问题,提出了一种改进的PSC-MPPT算法,通过Matlab软件建立模型对比仿真试验,证明了算法的时效性和精确性。     

计及输入变量强相关性的概率潮流计算模型

利用统计学的方法,以风电场出力为例,对其大量历史数据进行相关性分析,将具有强相关性的随机变量用最小二乘进行线性拟合,并用其中一个变量的线性表达式表示,从而消去随机变量之间的强相关性,并认为余下的呈弱相关或不相关的随机变量之间相互独立,以便采用半不变量法计算概率潮流。     

大坝渗流监测系统中电源智能控制子系统的设计与实现

文登市米山水库大坝自动化监测系统由于现场设备一直处于24 h供电状态,使得现场设备故障频发。为了解决这一问题,采用了电源智能控制系统,通过485总线与上位机进行通讯,由上位机对电源系统进行控制,实现了对现场设备的定时、按需、智能供电。经过半年多的使用,取得了良好的效果。     

42CrMo钢液相等离子碳氮共渗工艺研究

本文以乙醇胺、氯化钾、氯化铵的水溶液为电解液,用液相等离子电解技术对42CrMo钢进行碳氮共渗工艺进行研究。通过金相显微镜、扫描电镜（SEM）、电子能谱（EDS）、对处理试样表面形貌和渗层进行观察和分析,并对渗层硬度通过显微硬度计进行测试。结果表明：利用液相等离子电解技术可以实现42CrMo钢的碳氮共渗,渗层厚度可以达到60μm,渗层硬度可以达到537 HV,基本达到基体硬度的2倍。     

Control strategy for energy recovery system in hybrid forklift

After analyzing the working condition of the conventional diesel forklift, an energy recovery system in hybrid forklift is considered and its simulation model is built. Then, the control strategy for the proposed energy recovery system is discussed, which is validated and evaluated by simulation. The simulation results show that the proposed control strategy can achieve balance of the power and keep the state of charge （SOC） of ultra capacitor in a reasonable range, and the fuel consumption can be reduced by about 20.8% compared with the conventional diesel forklift. Finally, the feasibility of the simulation results is experimentally verified based on the lifting energy recovery system.     

Influence of lateral initial pressure on axisymmetric wave propagation in hollow cylinder based on first powerhypo-elastic model简

Influence of identical applied initial pressures on the radial surfaces of a hollow cylinder which is compose of materials with first power hypo-elastic constitutive model was investigated.The basic equations of the problem were built up based on the framework of piecewise homogeneous body model with the use of three-dimensional linearized theory of elastic waves in initially stressed bodies（TLTEWISB）.With the method proposed previously,this problem was then solved numerically.Moreover,the dispersion group velocity of the lowest order mode with different initial pressures was also studied.It can be concluded that the initial pressure and the geometry parameters will induce considerable changes of different degrees in dispersive relation between phase velocity and wave number in opposite trend（positive in initial pressure and negative in thickness）.