A novel approach to parameter extraction for on-chip transformers

In this paper, a novel approach to parameter extraction for on-chip transformers based on four-port Y-parameter is presented. Compared to the previous researches, the proposed fully parameter extraction from Y-parameter has better accuracy and feasibility for both the simulation before prototype and the improvement of the design after the measurement. And the 4-port model of transformer provides the solution of the fully differential applications. The model agrees very well with measurements for a variety of transformer configuration up to its self-resonant frequency.     

基于BiCMOS技术的高速数字/模拟转换器

基于BiCMOS技术,进行了高速数字/模拟转换器研究.以并行输入类型,电流工作模式的16位D/A转换器为载体,进行了电路设计、工艺制作和测试.在±5.0V工作电压下,测试得到转换速率≥30MSPS,建立时间为50ns,增益误差为±8%FSR,积分非线性误差为1/2 LSB,功耗为500mW.     

非理想信道下Colpitts混沌电路的自适应同步研究

本文研究了Colpitts混沌电路在非理想信道条件下的自适应同步问题。引入自适应控制器对输入到响应部分（response system）的衰变混沌信号进行预处理，来补偿衰落信道对于同步性能的影响。给出了系统的数学模型，对恒定信道衰变和时变信道衰变两种非理想信道条件下的混沌ColpiRs电路的自适应同步进行了数值仿真研究。仿真结果表明，对于恒定或慢变化的时变信道衰变，自适应控制器可以有效的提高Colpitts电路响应部分和驱动部分（Drive system）的同步性能。     

SDH传输网络评估优化方法的应用

本文主要介绍中山移动本地传输网网络评估优化的实施过程和采用的一些方法,以及实施本次评估优化的体会和进一步改进的建议.     

Q开关Nd:YAG激光治疗黑色文身的临床研究

目的：探讨Q开关Nd：YAG激光治疗黑色文身的临床效果。方法：采用Q开关Nd：YAG激光治疗黑色文身200例,能量密度4～8J/cm~2,脉冲宽度5～6ns,重复频率5Hz,光斑直径2～3mm。根据文身的性质需1～7个疗程,疗程间隔6～8周。结果：200例文身中190业余性文身经1～5次治疗,治愈率100%,10例专业性文身经4～7次治疗,治愈率90%。随访3～12个月,无一例发生继发性疤痕和永久性色素改变。结论：Q开关Nd：YAG激光能安全有效去除黑色文身,达到极佳的美容效果。     

An Effective Approach to Achieve a Spin Gapless Semiconductor–Half‐Metal–Metal Transition in Zigzag Graphene Nanoribbons: Attaching A Floating Induced Dipole Field via π–π Interactions

Under first‐principles computations, a simple strategy is identified to modulate the electronic and magnetic properties of zigzag graphene nanoribbons (zGNRs). This strategy takes advantage of the effect of the floating dipole field attached to zGNRs via π–π interactions. This dipole field is induced by the acceptor/donor functional groups, which decorate the ladder‐structure polydiacetylene derivatives with an excellent delocalized π‐conjugated backbone. By tuning the acceptor/donor groups, –C≡C– number, and zGNR width, greatly enriched electronic and magnetic properties, e.g., spin gapless semiconducting, half‐metallic, and metallic behaviors, with the antiferromagnetic?ferromagnetic conversion can be achieved in zGNRs with perfect, 57‐reconstructed, and partially hydrogenated edge patterns.     

Synergy of Pickering Emulsion and Sol‐Gel Process for the Construction of an Efficient,Recyclable Enzyme Cascade System

An efficient, easily recyclable enzyme cascade system based on nanoparticle‐stabilized capsules (NPSCs) is constructed through a synergy of a Pickering emulsion and sol‐gel process. Specifically, oligodopa‐coated titania nanoparticles (biomimetic titania) containing the first enzyme (FateDH) are synthesized through a bioadhesion‐assisted biomimetic mineralization approach. The biomimetic titania is then spontaneously assembled at the interface between the oil phase (hexadecane/butyl titanate (BuTi) mixture) and water phase during the formation of Pickering emulsions. The sol‐gel process of BuTi can produce not only butanol for assisting the formation of Pickering emulsions but also titania gel particles (sol‐gel titania) for cross‐linking the biomimetic titania through catechol‐titanium chelating. The NPSCs obtained, which contain the first enzyme, conjugate the second enzyme (FaldDH) onto the surface for constructing the enzyme cascade system. The system exhibits high activity and stability, particularly, superior recyclability for conversion of CO₂ into formaldehyde. In detail, the system shows a formaldehyde yield of 50.0%, and can quickly float onto the air/water interface soon after stopping the agitation of reaction mixtures, which ensures that the formaldehyde yield keeps almost unaltered after 10 times recycling. This study will be useful for facile construction of a wealth of catalytic systems with efficient, recyclable attributes.     

缩宫素对超声消融治疗子宫腺肌症的量效关系研究

目的：评价不同缩宫素剂量对超声消融子宫腺肌症的影响以及缩宫素在超声消融治疗过程中使用的安全性。方法：129例确诊的子宫腺肌症患者随机分为对照组、缩宫素0．32U／min组、缩宫素0．48U／min组进行超声消融治疗,比较各组间的消融效果及相关不良反应。结果缩宫素0．32U／min组和0．48U／min组分别与对照组相比,病灶体积消融率均明显高于对照组,消融单位体积所需时间和能效因子均明显小于对照组,差异有统计学意义。缩宫素0．32U／min组和0．48U／min组相比较,病灶体积消融率、消融单位体积所需时间和能效因子无显著性差异。三组均无严重不良反应。结论缩宫素能安全有效地降低超声消融子宫腺肌症所需的能量,提高治疗效率,但是增大剂量并不能提高超声消融的效益。     

基于响应矢量优化的共形阵列稳健波束形成方法

针对共形阵列天线自适应波束形成中存在的主瓣保形困难、旁瓣电平高等问题,该文提出基于波束响应矢量优化的自适应波束形成方法。在主瓣波束保形约束条件下,通过自适应地调整波束响应矢量,求得最优的响应矢量,进而求得准最优自适应权。该方法将非凸的二次约束二阶优化问题转化到高维空间进行求解,并通过半正定松弛(SDR)转化为凸优化问题,高效求得准最优解。该方法不仅保持了期望的主瓣响应,同时克服了传统线性约束最小方差(LCMV)自适应波束形成方法旁瓣高的缺点,并且对阵列构型具有稳健性。仿真实验验证了该方法的有效性。     

基于相位信息和主成分分析的对称性检测方法

对称性检测在图像分析与模式识别中具有重要意义。该文提出一种基于相位信息和主成分分析的对称性检测方法。首先在不同尺度、不同方向上计算相位对称性,其次在每个方向上将所有尺度的相位对称性进行融合,再次利用主成分分析提取各个方向的主要特征,最后利用非极大值抑制和自适应滞后阈值处理得到最终的对称性检测结果。实验证明：该文方法可直接对原始图像进行处理,不需要图像的任何先验知识,对于多目标图像不需分割等任何预处理;可以同时检测亮目标和暗目标的镜像对称、旋转对称、曲线对称;对图像亮度和对比度不敏感。