电信企业数据驱动存量营销发展策略

基于电信行业新增市场逐渐缩小,存量经营成为企业营销重点这一趋势,阐述了电信企业要实现数据驱动存量营销所需具备的条件以及目前尚存在的问题,并针对存量营销四大目标提出数据驱动存量营销发展策略建议:进行数据驱动存量营销IT系统的能力架构设计;梳理并建立电信企业存量营销运营管理流程;建立客户需求标签库和营销/策略资源库两个基础库;完善并建立需求资源配置、渠道触发和数据化管理三大存量营销核心能力.     

正弦相位调制下多波长掺铒光纤激光器的研究

通过理论分析并实验验证了一种能在室温下实现稳定的掺铒光纤激光器(EDF)多波长输出的方法。通过在线形谐振腔中引入正弦相位调制器。抑制了由于掺铒光纤的均匀展宽效应引起的模式竞争，从而避免了在室温情况下不稳定的单波长激射。与此同时，线形谐振腔引起的空间烧孔效应也有利于抑制均匀展宽效应。通过取样光纤光栅(SBG)的选频作用，实验中观察到稳定的5个波长的同时激射，相邻波长间隔为0．8nm，符合ITU标准。     

Defect Bragg Fiber With Low Loss for Broadband and Zero Dispersion Slow Light

Narrow bandwidth and large group velocity (v_g) dispersion are two fatal limitations of slow light in Bragg fibers. In this paper, by introducing a well-designed defect layer into the cladding of the Bragg fiber, the modal characteristics are modified by the coupling between the core mode and the defect mode. The defect location mainly determines the coupling strength and, thus, exerts a strong influence on v_g and dispersion. The defect thickness mainly determines the resonant wavelength of the defect waveguide and, thus, the wavelength where the modal coupling takes place. Consequently, the two limitations of the slow-light propagation in the Bragg fiber are overcome through proper optimization of the defect parameters. Around 1550 nm, a slow-light bandwidth up to 90 nm is achieved at an average v_g of c/5 (c is the light velocity in a vacuum) under N = 2, whereas an average v_g of c/10 is achieved with a bandwidth of 20 nm under N = 5. On the other hand, the slow-light propagation of v_g = 0.074c with both zero dispersion and zero dispersion slope is achieved, which is able to support applications requiring a subterahertz bandwidth of optical pulse. All of the fiber designs ensure sufficient low losses and good optical field distribution. The results are helpful in developing various Bragg-fiber-based slow-light devices.     

半导体锗纳米团簇和纳米层的生成与结构研究

我们在硅锗合金衬底上采用氧化等制膜方式生成零维和二维的纳米结构样品，用高精度椭偏仪(HPE)、卢瑟福背散射谱仪(RBS)和高分辨率扫描透射电子显微镜(HR-STEM)测量样品的纳米结构，并采用美国威思康新州立大学开发的Rump模拟软件对卢瑟福背散射谱(RBS)中的CHANNEL谱和RANDoM谱分别进行精细结构模拟，测量并计算出纳米氧化层与锗的纳米薄膜结构分布，并且反馈控制加工过程，优化硅锗半导体材料纳米结构样品的加工条件。我们测量出样品横断面锗纳米团簇和纳米层的PL发光谱。我们在硅锗合金的氧化层表面中首次发现纳米锗量子点组成的几个纳米厚的盖帽膜结构，我们首次提出的生成硅锗纳米结构的优化加工条件的氧化时间和氧化温度匹配公式的理论模型与实验结果拟合得很好。     

基于偏振光干涉仪的Interleaver解复用器实验研究

为实现更窄信道间隔的密集波分复用 ,提出了一种基于偏振光干涉仪的新型Interleaver解复用器 ,分析了结构组成与基本工作原理 ,对其进行了初步的测试实验 ,该器件所分开的DWDM系统两组波长功率均衡 ,隔离度分别为 1 0 6dB和 1 4 6 4dB ,- 1dB带宽分别为 0 7nm和 0 4nm。     

"一步建站"Web管理系统的探讨和实现

“一步建站”Web管理系统是指通过Web界面一次性提交用户资料，系统自动完成为上网建站用户开通虚拟服务器、进行域名解析、创建FTP维护账号及指定租用硬盘空间大小等一系列操作。同时，该系统还可对已开通的用户站点进行管理。     

二极管非制冷红外探测器及其读出电路设计

针对非制冷红外技术的低成本高性能应用,提出了基于SOI的二极管红外探测器及其读出电路的集成设计方案。阐述了二极管非制冷红外探测器的基本原理和工艺实现。对探测器的电学特性进行理论推导,得出读出电路的设计指标。采用连续时间自稳零电路结构实现探测器输出信号的低噪声低失调放大,采用级联滤波器以减弱开关非理想因素的影响,并采用片内电容采样保持,使得I/O引脚数较少,从而减小版图面积。采用spectre工具进行仿真,在CSMC 0.5 m 2P3M CMOS工艺下实现。结果表明:读出电路性能良好,闭环增益为65.8 dB,等效输入噪声谱密度为450 nV/Hz,等效输入失调电压100 V以内,功耗为5 mW,能实现探测器信号的准确读出。     

嵌入式GPS轨迹记录仪

设计了一种基于嵌入式技术的车载GPS导航系统用以实现对用户行驶路线的记录.本文主要对3个方面的技术进行了研究:一是介绍了GPS技术的原理、特点、系统组成和定位方式;二是介绍了嵌入式车载GPS轨迹记录仪的硬件结构、设计思路和实现方法.三是结合Google Earth的3维实景地图实现将使用者所在的位置及行走速度和方向显示...     

Evolution of Local Structural Ordering and Chemical Distribution upon Delithiation of a Rock Salt–Structured Li1.3Ta0.3Mn0.4O2 Cathode

Lithium‐rich disordered rock‐salt oxides have attracted great interest owing to their promising performance as Li‐ion battery cathodes. While experimental and theoretical efforts are critical in advancing this class of materials, a fundamental understanding of key property changes upon Li extraction is largely missing. In the present study, single‐crystal synthesis of a new disordered rock‐salt cathode material, Li_1.3Ta_0.3Mn_0.4O₂ (LTMO), and its use as a model compound to investigate Li concentration–driven evolution of local cationic ordering, charge compensation, and chemical distribution are reported. Through the combined use of 2D and 3D X‐ray nanotomography, it is shown that Li removal accompanied by oxygen oxidation is correlated with the development of morphological defects such as particle cracking. Chemical heterogeneity, quantified by subparticle level distribution of Mn valence state, is minimal during Mn redox, which drastically increases upon the formation of cracks during oxygen redox. Density functional theory and bond valence sum mismatch calculations reveal the presence of local short‐range ordering in the pristine oxide, which gradually disappears along with the extraction of Li. The study suggests that with cycling the transformation into true cation–disordered state can be expected, which likely impacts the voltage profile and obtainable energy density of the oxide cathodes.