用于量子通信的增益开关半导体激光器研究进展

量子通信是当前量子信息领域的研究前沿和热点。增益开关半导体激光产生技术是一种实现脉冲激光产生的成熟方法,将其与注入锁定技术结合,可以满足量子通信应用对激光脉冲的需求。系统地介绍了增益开关半导体激光器的工作原理和注入锁定方案,以及其在量子密钥分发、量子随机数产生等方面的应用现状,着重从物理原理、实验方案和最新研究进展等方面进行阐述,并对其下一步的发展进行简要展望。     

Infrared target tracking in multiple feature pseudo-color image with kernel density estimation

Tracking targets in infrared images is a challenging subject due to the low contrast and severe noise. Kernel density estimation (KDE) with robust performance is one of the well-known tracking algorithms. In essence, tracking targets with KDE algorithm is tracking the statistical features of their pixels by the histograms. The universal KDE which can track any features of targets has not been developed. We propose a strategy which does not need to improve on the KDE algorithm itself, but it can make KDE track other features. We first map the features into the pixel intensity and create the feature images. Then these feature images are used to construct the multiple feature pseudo-color images (MFPCIs). The kernel density estimation algorithm tracks targets in MFPCIs can indirectly track these features. Experiments validate that the performance of tracking targets in MFPCIs outperforms that of tracking them in the original infrared images.     

聚苯乙烯我—1，2—亚乙基多胺树脂催化合成正丁基苯基醚

由氯甲基聚苯乙烯和多－1,2－亚乙基多胺反应合成了聚苯乙烯我－1,2－亚乙基多胺树脂,并通过质量变化,分析,交换量和红外光谱进行了表征,研究了利用该树脂催化合成正丁基苯基醚的反应,催化剂能够回收并重复使用,4次后其质量未损失,活性未下降。     

应用于CMOS图像传感器的高速全差分两步式ADC设计方法

由于传统的单斜式模数转换器(SS ADC)以及改进的各种架构串行两步式SS ADC普遍存在速度瓶颈问题,均无法满足工业界高帧率CMOS图像传感器的发展需求,该文提出一种应用于高帧率CMOS图像传感器的高速全差分两步式ADC设计方法。该ADC设计方法基于差动斜坡与时间数字转换(TDC)技术,将差动量化嵌套在两步式的量化中,形成了区别于串行量化的并行量化模式,不仅提升了数据量化的速率,而且保证了系统的一致性和鲁棒性;针对传统TDC技术与单斜式ADC的匹配性问题,提出了一种基于电平编码的TDC技术,在ADC量化的最后一个时钟周期内,在不提升系统时钟的情况下,完成时间数字转换,实现了更高精度的量化。该文基于55 nm 1P4M CMOS实验平台完成了所提方法的电路设计、版图设计和测试验证。在模拟电压3.3 V、数字电压1.2 V、时钟频率100 MHz、动态输入范围1.6 V的设计环境下,该文ADC设计精度为12 bit,转换时间仅有480 ns,列级功耗低至62 μW,DNL以最低有效位(LSB)计为+0.6/–0.6,INL以最低有效位(LSB)计为+1.2/–1.4,信噪失真比(SNDR)达到70.08 dB,与现有的先进单斜式ADC相比,ADC转换速度提高了52%以上,可以有效压缩行处理时间,为高帧率大面阵CMOS图像传感器的实现提供了有效的解决方案。     

Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

Modulating and constructing interface engineering is an efficient strategy to enhance catalytic activity for water splitting. Herein, a hybrid nanoarray structure of V‐CoP@a‐CeO₂, where “a” represents amorphous, integrated into carbon cloth is fabricated for water splitting. The synergy effect between V and CeO₂ can increase the electron density of Co atoms at active sites, further optimizing the Gibbs free energy of H* adsorption energy (ΔG_H*). Besides, V‐CoP@a‐CeO₂ possesses lower water adsorption/dissociation energies, enabling accelerated reaction kinetics in alkaline media. As expected, the V‐CoP@a‐CeO₂ exhibits superior performance toward the hydrogen evolution reaction and the oxygen evolution reaction. More importantly, a two‐electrode electrolyzer combined with an electrocatalyst of V‐CoP@ a‐CeO₂ only demands that voltages of electrolytic cell are 1.56 and 1.71 V to achieve the current densities of 10 and 100 mA cm^?2, respectively. This work provides guidance for the design or optimization of materials for water electrolysis and beyond.     

微分C—V法和C—V法测量硅外延层杂质纵向分布的指数模型

提出了n/n~+或p/p~+硅外延层电荷密度ρ随x~(n-2)方式变化的正、负指数分布模型。导出了微分C—V法和C—V法杂质浓度纵向分布公式;也导出了两方法的耗尽层宽度公式。引入了n参数[logC—log(V_p—V)直线的斜率负倒数],可免去ASTMF419和SJl551—79逐点测量的麻烦,并使数据处理更为精确。还给出了硅外延层中杂质浓度纵向分布的规律。     

Enhancement of lithium amide to lithium imide transition via mechanical activation

The decomposition of lithium amide (LiNH2) to lithium imide (Li2NH) and ammonia (NH3) with and without high-energy ball milling is investigated to lay a foundation for identifying methods to enhance the hydrogen uptake/release of the lithium amide and lithium hydride mixture. A wide range of analytical instruments are utilized to provide unambiguous evidence of the effect of mechanical activation. It is shown that ball milling reduces the onset temperature for the decomposition of LiNH2 from 120 degrees C to room temperature. The enhanced decomposition via ball milling is attributed to mechanical activation related to the formation of nanocrystallites, the reduced particle size, the increased surface area, and the decreased activation energy. The more mechanical activation there is, then the more improvement there is in enhancing the decomposition of LiNH2. It also is found that the activation energy for the decomposition of LiNH2 without ball milling is 243.98 kJ/mol, which is reduced to 222.20 kJ/mol after ball milling at room temperature for 45 min and is further reduced to 138.05 kJ/mol after ball milling for 180 min. The rate of the isothermal decomposition at the later phase of the LiNH2 decomposition is controlled by diffusion of NH3 through the Li2NH layer.     

矿井机电设备维修管理信息系统

在分析矿井机电设备维修管理信息流的基础上 ,对使用计算机软件进行矿进机电设备管理做了研究 ,并对系统的设计方法以及安全机制进行了介绍。本系统的应用为矿井机电设备管理上水平提供了有效的手段     

A Novel Millimeter-Wave Power Combining Circuit

This paper presents the analysis and design of a novel millimeter-wave power combining circuit. This combing circuit is composed of a new style 3-dB combiner, which achieves low-loss, wide-band, and symmetric power division. Different from conventional Wilkinson hybrid, the proposed combiner requires no isolating resistor, and is easier fabricated and more suitable for millimeter integrate circuits. Analytical and experimental work on a two-way combining circuit with wave-guide ports in Ka-band shows the combiner has an insertion loss of 0.2dB, and a power-combining efficiency above 80% in 32–33GHz is obtained.