Monitoring of 1997 El Niño from TOPEX/Poseidon

In early 1997, one El Niño event occurred. The change of the sea surface height during the event was monitored with TOPEX altimetric data, and this is helpful to the study on the formation and development mechanism of an El Niño event and its impact on the global climatic change.     

蓝牙技术及其应用

阐述了蓝牙系统的组成与网络结构，分析了其主要的相关技术、硬件结构，并讨论了应用前景。     

转生长激素基因彩鲫(Colorful Curcain carp)的获得及检测

转基因育种技术加快了鱼类育种速度,已成为鱼类分子生物学研究的重点．以往用于转基因鱼研究的基因元件基本上都是来自哺乳动物,从基因安全的角度讲,构建全鱼“元件”的转基因鱼是转基因鱼市场化的前提．作为观赏鱼类的彩鲫,色彩丰富,体形优美,但其生长速度缓慢,通过转基因方法可望生     

家兔个体发育初期迷走——加压反应的特点

实验记录了４～３０ｄ龄家兔的迷走－加压反应，结果显示，家兔在个体发育初期，随着年龄增长，迷走－加压反应的潜伏期逐渐缩短，加压速度加快，加压幅度和加压持续时间不断增高和延长，单相加压反应比例亦随年龄增长而减少，提示：幼兔生后初期迷走－垂体后叶通路已初步形成，其结构与功能随年龄增加而逐渐完善。     

^5^7Co激发态寿命的测量

介绍采用简单延迟符合法测量５７Ｃｏ原子核激发态寿命，所得结果与文献值［１］基本符合．     

Isothermal section of ternary Sn ? Zn?Ni phase equilibria at 250 °C

Ternary Sn ?Zn? Ni alloys were prepared and equilibrated at 250 °C for 4? 15 weeks. The phases formed in these equilibrated alloys were determined experimentally. The isothermal section of Sn ?Zn? Ni system was constructed, based on the phase diagrams of the three constituent binary sy stems and the ternary phase equilibria data, determined in this study and referenced in literatures. 12 single-phase regions were identified in the Sn? Zn?Ni ternary system at 250 °C, including the three ternary compounds, δ , τ1 and τ2. There were 13 ternary phase regions and 23 binary phase regions in the 250 °C Sn ? Zn? Ni isothermal section. The solubility of Zn in the binary Sn ?Ni compounds is significant, and is 15.1% (mole fraction) in the Ni3Sn phase.     

最小损失算法在区块链物联网中的优化研究

区块链技术与物联网相结合能发挥去中心化优势,在一定程度上提升物联网系统数据安全性及可靠性等性能.但区块链的通量受限特征,使得区块链较低的交易吞吐量在很大程度上难以满足物联网场景下的高吞吐量的业务需求.本文提出一种最小损失函数算法,首先,根据状态和动作输入对来构建状态空间和行为空间;其次,在系统延迟性约束条件下,迭代计算出状态空间和行为空间的行为价值函数;最后,利用损失函数对比行为价值函数的真实值和估计值后执行吞吐量最大值去调整块大小和块间隔.仿真结果表明,与DDRL算法和DRL算法相比,最小损失算法动态调整区块大小和区块间隔,在基于区块链的物联网系统达到稳定后可以获得更高的吞吐量.     

蓝牙串口模块与TMS320C6713异步串行通信的实现

为了实现TMS320C6713转轮裂纹声发射检测系统的无线数据传输,采用TL16C550C扩展TMS320C6713串口与蓝牙模块连接,可以使蓝牙模块间在设定速率下进行无线通信.经水车室内通信测试表明:数据传输误码率低,系统运行稳定.     

基于蓝牙技术的无线数据采集系统设计

本文介绍了一种基于蓝牙技术的无线数据采集系统。该系统核心采用TI公司的超低功耗MSP430系列单片机,利用单片机内部自带的12位AD和DMA进行数据的采集,并通过蓝牙模块将采集的数据以无线电波的方式发送到终端设备。该系统具有体积小、结构简单、功耗低、速度快、采集精度较高等优点,还可以通过更换传感嚣及修改软件推广到对多种信号采集中去。     

STUDY OF RADIO DEVICES ON 2.4GHZ ISM BAND IN PHYSICAL PHASE

In the unlicensed 2.4GHz ISM band,there is not only IEEE 802.11 wireless systems being used,but also some other devices,such as residential microwave oven,Bluetooth devices,and cordless phone.All these devices that are not used for the data communications cause unintentional interference that will degrade the WI-FI system.In this paper,the transmission powers for common RF devices are measured and the SIR （signal-to-interference ratio） of different interferers to Wi-Fi is also studied.With this information,the effect of different interference on WI-FI signal can hence be quantified.Furthermore,the ability of the interference avoidance protocols,which is built into the AP, to address interference problems caused by that device is determined.