一种低成本城市停车诱导系统中区域性Zigbee网络的设计

为降低城市级停车诱导系统的建设、运营成本,提出一种无需建立管理控制中心的系统架构,采用LPC11C14和CC2530作为核心芯片设计了系统中的重要组成部分——区域性Zigbee网络。通过所开发出的测试系统的实验,表明该Zigbee网络可准确接收用户手机发出的停车请求,并能根据停车场内车位状态向用户反馈最佳车位信息,从用户发送请求到收到反馈信息的时间不超过10s。     

长途智能网全网帐务计费结算流程设计解析

本文详细分析了中国长途智能网全网帐务计费结算流程设计,并就此方面指明了全面开通长途智能网业务并确保全网顺畅运转的关键所在。     

Analysis of Optical Losses in a Photoelectrochemical Cell: A Tool for Precise Absorptance Estimation

Optical losses in a photoelectrochemical (PEC) cell account for a substantial part of solar‐to‐hydrogen conversion losses, but limited attention is paid to the detailed investigation of optical losses in PEC cells. In this work, an optical model of combined coherent and incoherent light propagation in all layers of the PEC cell based on spectroscopic measurements is presented. Specifically, photoelectrodes using transparent conductive substrates such as F:SnO₂ coated with thin absorber films are focused. The optical model is verified for hematite photoanodes fabricated by atomic layer deposition and successfully used to determine wavelength‐dependent reflection, transmission, layer absorptances, and charge generation rates. Furthermore, the calculated absorptances enable 20–30% more accurate calculations of the absorbed photon‐to‐current efficiency of PEC cells. Our optical model is a powerful tool for the optimization of the optical performance of PEC cells focusing on single absorber or tandem configurations and represents a cornerstone of a complete (optical and electrical) model for PEC water splitting cells.     

高校开水房节能型水龙头创新设计

高校开水房是高校用水系统的重要组成部分,如果高校开水房的水龙头设计不合理,就会导致高校水资源严重浪费。因此,在高校开水房中使用节能型水龙头对于提高水资源的利用效率,减少水资源浪费具有十分重要的意义。本文主要研究了双调节节能型水龙头的设计目的、工作原理以及具体设计方案。     

LDPC码在浅海水声通信中的应用研究

LDPC码具有编码增益高、译码速度快、可并行译码等特点,是当前编码界的一个研究热点。针对复杂多变、强多途和大起伏干扰的浅海水声信道,建立了LDPC码在浅海水声信道中仿真的模型,仿真研究了浅海水声信道下采用和一积译码算法的LDPC码性能。仿真结果表明,LDPC码在3径多途信道下性能优越;当译码迭代3—5次,码长1000bit左右时基本上能满足水声通信对误码率为10^-4的基本要求。     

基于PLC与变频器的空压机恒压供气系统

本文介绍了一种基于PLC与变频器的空压机恒压供气系统的工作原理与构成。系统中高压变频器采用一拖二方式,控制一台活塞式空压机的转速,以保持整个系统的恒压供气。另外由于系统涉及到不同PLC以及PLC与其它设备之间的通讯,通过采用不同通讯协议构建了一个通讯网络。以某矿为例,我们介绍了系统的具体实现。     

Efficient and Stable Bifunctional Electrocatalysts Ni/NixMy (M = P,S) for Overall Water Splitting

Development of easy‐to‐make, highly active, and stable bifunctional electrocatalysts for water splitting is important for future renewable energy systems. Three‐dimension (3D) porous Ni/Ni₈P₃ and Ni/Ni₉S₈ electrodes are prepared by sequential treatment of commercial Ni‐foam with acid activation, followed by phosphorization or sulfurization. The resultant materials can act as self‐supported bifunctional electrocatalytic electrodes for direct water splitting with excellent activity toward oxygen evolution reaction and hydrogen evolution reaction in alkaline media. Stable performance can be maintained for at least 24 h, illustrating their versatile and practical nature for clean energy generation. Furthermore, an advanced water electrolyzer through exploiting Ni/Ni₈P₃ as both anode and cathode is fabricated, which requires a cell voltage of 1.61 V to deliver a 10 mA cm^?2 water splitting current density in 1.0 m KOH solution. This performance is significantly better than that of the noble metal benchmark—integrated Ni/IrO₂ and Ni/Pt–C electrodes. Therefore, these bifunctional electrodes have significant potential for realistic large‐scale production of hydrogen as a replacement clean fuel to polluting and limited fossil‐fuels.     

Precisely Controlled Hydration Water for Performance Improvement of Organic–Inorganic Perovskite Solar Cells

Recently, intensive studies on the role of water molecule in the formation of organic–inorganic perovskite film have been reported. However, not only the contradictive phenomena but also the complex processing technique has hindered the widespread use of water molecule in perovskite preparation. Here the hydration water is introduced into the precursors instead of water. By precisely controlling the content of hydration water, a smoother and more uniform perovskite film is obtained through a simple one‐step spin coating method. The improvement of perovskite film quality leads to highly efficient planar perovskite solar cells. Summing up the device studies and the investigation of morphology, crystallization, and optical properties, the impact of water molecule in the formation of perovskite crystal and consequences of device performance is understood. Due to its universal adaptability and simplified process, precise control of hydration water is therefore of great utility to high quality perovskite films fabrication and large‐scale production of this upcoming photovoltaic technology.     

某新建办公楼水蓄冷集中空调系统技术分析

介绍了一个水蓄冷空调系统的构成及运行情况,分析了蓄冷水池在各种空调负荷下的运行情况,对系统进行了性能评价。认为利用消防水池兼作水蓄冷,可以节约初投资和运行费,指出了水蓄冷系统设计特点和运行策略。     

基于手机信令数据的城市滨水空间活力研究——以苏州金鸡湖为例

面对城市滨水空间出现的空间活力衰退等问题,如何唤醒城市滨水空间活力、重塑入水和谐互动,是城镇化转型中城市空间品质提升的重要议题.手机信令大数据因其样本规模庞大、时空粒度精细、动态轨迹直观的特性,为城市滨水空间活力提升研究提供新视角.以苏州金鸡湖为例,利用手机信令大数据获取到的人群时空动态分布信息,分析滨水空间人群活力的...