Fiber lasers are used for material processing applications like cutting and welding, marking, and fine and micro processing of components in the automotive, manufacturing, heavy industry, and consumer electronic sectors. They are also used extensively for medical applications and R&D purposes.

The Asia-Pacific ICT sector, which acquires a greater share of the global ICT market with each passing year, grew slowly over the past six months under review, along with the advanced economies.

The Asia-Pacific accounts for half of mobile subscribers globally, according to Groupe Speciale Mobile Association (GSMA), and should remain one of the world’s fastest growing mobile markets through 2020 and beyond.

The global wireless sensors market is expected to grow at a moderate rate during the forecast period 2014-2019. The Americas is the leading region and is followed by APAC and EMEA. A main reason for this is that the market is still in its infancy in comparison to the potential market size for this industry. The global wireless sensors market is likely to grow at a CAGR of 20.58% during the forecast period.

提出一种面向容错的对地观测卫星任务调度模型,该模型采用主版本/副版本技术可以实现对任意时刻一颗卫星失效时的容错.在容错调度模型的基础上,提出了一种卫星容错调度算法FTSS.FTSS采用重叠技术,有效提高了卫星资源利用率.此外,FTSS采用了任务合成策略可以有效减少实际执行任务的个数从而进一步提高系统的可调度性.为了验证FTSS算法的性能,本文通过模拟实验对FTSS与其它3个基准算法进行了比较分析.实验结果表明FTSS优于其它算法,适合卫星实时任务容错调度.

基于域Fpm上一类特殊的矩阵,定义了环R（pm,k）=Fpm[u]/k>到Fpmpj的一个新的Gray映射,其中uk=0、p为素数、j为正整数且pj-1+1≤k≤pj.得到了环R（pm,k）上码长为任意长度N的（1+u）常循环码的Gray象是Fpm上长为pJN的保距线性循环码,并给出了Gray象的生成多项式,构造了F3,F5和F7上的一些最优线性循环码.

本文利用经验模态分解算法(EMD),研究了不同状态下混沌信号的方差特性,提出了一种EMD分解层数自适应的去噪算法.该算法根据固有模态函数(IMF)方差最大值对应层数与总分解层数的关系,能够自适应选择需处理的IMF层数,并结合提升小波在更新和预测方面的优势综合去噪,分别以Lorenz、Chen系统(加入10%-100%的高斯白噪声)和实测的IPIX雷达数据作为混沌背景噪声进行了实验研究.结果表明:在不同程度的低噪声(≤30%)环境下,与传统小波阈值去噪等方法相比,其均方误差降低了30%以上,信噪比提高了1.5db-3.5db,并能有效地去除海杂波噪声,提高混沌背景下的微弱信号检测效果.

连铸生产过程中,铸坯内部温度场无法实时测量,表面温度难于准确测量,而稳态传热模型不能模拟实际工艺参数频繁变化的浇注过程,本文建立了实时凝固传热模型,并对模型的影响因素进行了分析.考虑到铸坯表面随机剥离的氧化铁皮对其测温的干扰,研究建立了基于面阵的CCD测温系统,并结合数值分析方法,消除了铸坯表面氧化铁皮对测温的干扰,还原铸坯表面真实温度,使测量的铸坯表面温度波动在±10℃范围内.通过采用CCD面阵测温、射钉测厚以及数值分析方法,实现了基于多信息融合的铸坯温度场在线测量,为二冷配水动态优化和铸坯温度场闭环控制提供了基础.

Here we report a Si-Ge avalanche photodiode (APD) with a breakdown voltage of only -10V. The highest measured bandwidth is 15.8GHz for a 20μm diameter device. A bandwidth of 13.2 GHz at gain of 22.2 is obtained for the same device, giving a 290GHz gain-bandwidth product at 1550nm wavelength. 

We report on low power consumption, high direct modulation speed performance of compact hybrid silicon microring lasers. By integrating a novel thermal shunt, device joule heating is significantly reduced, leading to low threshold, high continuous wave (cw) lasing temperature as high as 105 degC.