Design of the low power wake-up receiver for internet of things communication

A wake-up receiver with high energy efficiency and low power consumption is proposed for solving the power consuming problems of wireless nodes communication in the Internet of Things. The proposed wake-up receiver based on the wake-up mechanism can effectively schedule the network nodes communication, and use the simple envelope detection structure to achieve frequency down-conversion, which can flexibly manage energy and reduce power consumption. Based on UMC 65nm CMOS process technology, the wake-up receiver is designed and simulated. The results show that it can achieve S₁₁ of -21dBm and a sensitivity of -75dBm at a data rate of 1Mb/s, when operating at the central frequency of 780MHz and input signal adopting an on-off keying (OOK) modulation, and the power consumption is 82μW at 1.2V voltage supply.     

伸缩臂起重机液压控制的新趋势

从对现代化大型系列越野轮胎起重机的运动性能、起重性能和附加的要求出发,针对小型和大型两种起重机进行分析,给出主控制和回转机构控制的控制方案及发展趋势。     

下一代测试系统的多参量建模与同步测试分析

针对复杂电子装置及系统的故障诊断和自动测试,传统的测试仪器和自动测试系统已不能满足实际要求,下一代测试系统和综合仪器便应运而生.在设计下一代测试系统和综合仪器的基础上,给出了下一代测试系统的关联多参量的描述方法,以及对自动测试至关重要的同步测试方法.     

强油非导向变压器热特性分析及优化设计

本文中作者借助流体软件对强油非导向变压器进行了热特性分析,并对变压器内部散热油路及冷却器进行了优化设计.     

Oxidation Performance of Fe-Al/WC Composite Coatings Produced by High Velocity Arc Sprayed at 650 ℃

Fe-Al intermetallics with remarkable high-temperatureintensity and excellent erosion,high-temperatureoxidation and sulfuration resistance are potential lowcost high-temperature structural material.ProducingFe-Al/WC composite coating by high velocity arcspraying(HVAS)on structural materials would notonly obviate the problems faced in fabrication of thesealloys into useful shapes,but also allow the effectiveuse of their outstanding high-temperature performance,which might thus promisingly mak…     

KINETICS OF OXIDATION LEACHING OF Ag IN AMMONIACAL SOLUTIONS

研究了Ag在NH_3-O_2和NH_3-H_2O_2水溶液体系中的浸取行为.结果表明,在常压下氧化剂浓度低时(如在NH_3-O_2体系中),浸取反应受在Ag表面上生成的氧化物膜所阻碍;而在浓度足够高的氧化剂时(如在NH_3-H_2O_2体系中),浸取过程可在不生成氧化物膜的条件下进行,此时Ag的溶解速度受传质步骤控制.文中讨论了在氨性溶液中Ag氧化浸取的反应机理.     

高线粗中轧机"浮动"检测结构设计及故障排除

为克服轧制中因机架锁紧功能降低而产生的机架沿轨座轴向移动的"浮动"现象,对其产生原因进行了分析,并通过改进锁紧装置结构及相关部件,使"浮动"故障得到预防和有效控制并及时排除。     

薄壁防渗墙施工工艺

结合建造薄壁防渗墙工程实例,通过分析几种施工工艺的成墙原理和优缺点,合理选择薄壁防渗墙施工工艺。     

面向海洋通信网络的分布式系统容错机制

针对在船队航行过程中,由于网络通信不稳定引起的P2 P分布式系统节点频发的退出问题,通过优化P2 P分布式架构的容错策略,提高系统的抗灾能力。探讨并设计在海洋环境下分布式系统的容错机制,提出更加适用于全新容错机制的节点选举方法,提高节点选举的可靠性和稳定性。在优化的P2 P架构下,设计并实现基于船队出海环境的分布式数据平台原型系统。通过仿真实验证明该系统具有较好的可伸缩性、独立性和稳定性。