Novel passive localization algorithm based on weighted restricted total least square

A novel multi-observer passive localization algorithm based on the weighted restricted total least square (WRTLS) is proposed to solve the bearings-only localization problem in the presence of observer position errors. Firstly, the unknown matrix perturbation information is utilized to form the WRTLS problem. Then, the corresponding constrained optimization problem is transformed into an unconstrained one, which is a generalized Rayleigh quotient minimization problem. Thus, the solution can be got through the generalized eigenvalue decomposition and requires no initial state guess process. Simulation results indicate that the proposed algorithm can approach the Cramer-Rao lower bound (CRLB), and the localization solution is asymptotically unbiased.     

半导体应变片式传感器应用研究

应变片式传感器由于自身所具有的灵敏度、测量精度和可靠性高、动态响应快、抗干扰性强等特性，已在许多领域获得广泛应用。本文仅就实际使用的一个方面，做一系统介绍，供应用者进一步开发研究。     

一种利用光纤光栅技术的巷道实时监测系统

提出了基于光纤光栅原理对巷道关键断面的应变和位移进行监测的实施方案,系统采集大量数据进行分析得到关键截面应变和围岩变形规律,为生产管理者提供科学的判断依据,并及时采取相应措施,阻止围岩失稳、避免突发性破坏的发生。     

Tensile Properties of Fiber Materials under Different Strain Rates

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嗜热硫氧化硫化杆菌一新菌株的分离与鉴定

从云南腾冲酸性热泉富集物中分离到一株适度嗜热喜酸菌YN22.该菌革兰氏染色阳性,直杆状或微弯,长约1.6~2.8μm,直径0.4~0.7μm.该菌能在25~60℃下生长,最适生长温度为53℃;生长pH为1.0~5.0,最适pH为1.5;化能自养型,0.025%(w/V)的酵母提取物对其生长有明显的促进作用,在酵母提取物存在的情况下能快速氧化Fe2 ,但对S0和还原型硫化物的氧化能力较低.16s rDNA系统发育分析表明,该菌与嗜热硫氧化硫化杆菌(Sulfobacillus thermosulfidooxidans)的16s rDNA序列相似性达99%.YN22基因组DNA的G C含量为47.3 mol%,与嗜热硫氧化硫化杆菌模式菌株VKM B-1 269非常接近,后者基因组DNA的G C含量为47.5 mol%.基于形态特征、生理生化特性、系统发育学和G C含量的分析结果,YN22应归于硫化杆菌属(Sulfobacillus),为嗜热硫氧化硫化杆菌(Sb.thermosulfidooxidans)的一新菌株.这是国内首次分离,并经多种方法鉴定、确认的嗜热硫氧化硫化杆菌,从而为我国浸矿微生物的基础和应用研究提供了最典型的适度嗜热菌种.     

TK-120型中间再热机组起停及负荷变动时中压缸热应力试验研究

本文总结了淮南发电厂TK-120型中间再热机组中压缸在过渡工况下热应力的试验研究工作,对中压缸翘曲变形原因及过渡过程中的应力水平进行了分析探讨。研究结果对合理制定机组起停方式提供了有价值的依据。     

循环载荷下缺口板弹塑性应变分布测定

用电测法测定了带有中心圆孔矩形铝合金（ＬＹ－１２－ＣＺ）板在循环载荷作用下横截面的弹塑性应变分布，同时测定了循环载荷下孔边应力──应变回线，弹塑性应变集中系数Ｋε和应力集中系数Ｋσ，并和四种近似公式的计算结果进行了比较。发现在循环加载情况下用电测法绘制载荷──应变回线，并根据回线出现畸变的现象，可以灵敏的检测裂纹的萌生和早期扩展。     

钻孔应变观测数据的分形特征研究

形变观测数据是地震监测预报和地球科学研究重要数据源,其中环境干扰排除、地震震例等异常数据的检测是形变观测数据推广应用的关键内容。本文针对形变观测数据中的钻孔应变观测数据,通过计算绘制功率谱图,研究其Hurst指数与盒维数分形特征,实现对观测数据中地震事件等异常数据的检测。实验结果表明钻孔应变观测数据符合1/f分布,其具有长时间记忆的分形特征,Hurst指数与分形盒维数变化都凸显出了地震等异常数据。随着信噪比的下降,钻孔应变观测数据的Hurst指数呈现下降的趋势,其盒维数呈现增加的趋势,进一步证实了Hurst指数与分形盒维数之和为2的关系,而它们的变化较大,表明具有较弱的抗噪能力。本文的研究结果可为地震研究提供理论基础。     

Silicon carbide resonant tuning fork for microsensing applications in high temperature and high G shock environments

We present the fabrication and testing of a silicon carbide(SiC)balanced mass double-ended tuning fork that survives harsh environments without compromising the device strain sensitivity and resolution bandwidth.The device features a material stack that survives corrosive environments and enables high-temperature operation.To perform high-temperature testing,a specialized setup was constructed that allows the tuning fork to be characterized using traditional silicon electronics.The tuning fork has been operated at 600 ℃ in the presence of dry steam for short durations.This tuning fork has also been tested to 64 000 G using a hard-launch,soft-catch shock implemented with a light gas gun.However,the device still has a strain sensitivity of 66 Hz/με and strain resolution of 0.045 με in a 10 kHz bandwidth.As such,this balanced-mass double-ended tuning fork can be used to create a variety of different sensors including strain gauges,accelerometers,gyroscopes,and pressure transducers.Given the adaptable fabrication process flow,this device could be useful to micro-electro-mechanical systems(MEMS) designers creating sensors for a variety of different applications.