摘要：A new space-time block codes based on quasi-orthogonal designs are put forward. First the channel model is formulated. Then the connection between orthogonal /quasi-orthogonal designs and space-time block codes is explored. Finally we make simulations for the transmission of 4 bits/s/Hz and 6 bits/s/Hz using eight transmit antennas using the rate 3/4 quasi-orthogonal space-time block code and the rate 1/2 full-diversity orthogonal space-time block code. Simulation results show that full transmission rate is more important for very low signal noise ratio (SNR) and high bit error probability (BEP), while full diversity is more important for very high SNR and low BEP.

摘要：This paper presents the design of Optimal Infinite-Impulse Response (IIR) digital filters using Genetic Algorithm (GA). IIR filter is essentially a digital filter with Recursive responses. Since the error surface of digital IIR filters is generally nonlinear and multimodal, global optimization techniques are required in order to avoid local minima. This paper presents heuristic way for the designing IIR filters. GA is a powerful global optimization algorithm introduced in combinatorial optimization problems. The paper finds the optimum Coefficients of IIR digital filter through GA. Design of Lowpass and High pass IIR digital filter is proposed to provide estimate of transition band. It is found that the calculated values are more optimal than fda tool available for the design of filter in MATLAB. The simulation result of the employed examples shows an improvement on transition band and mean-square-error (MSE). The position of pole-zero is also presented to describe stability and results are compared with Simulated Annealing (SA) method.

摘要：A Terahertz sensing method based on the resonant transmission characteristics through metallic aperture arrays is proposed. Here we present metallic aperture arrays of rectangular and H-shaped holes which induce localized resonance. High characterization sensitivity to surface condition is demonstrated. When applied with the liquid of 3-pentanone, arrays of rectangular and H-shaped holes have sensitivity of 158 and 172 GHz/RIU （refractive index unit）, respectively. So the metal meshes based localized resonance can also be used as a sensor chip in terahertz region.

摘要：具有左手特性的超材料因具有超常物理特性近年来倍受关注,在微波工程领域也具有重要应用价值。本文设计了一种由多重嵌套方形开口环和一组平行金属线构成的夹芯结构超材料,采用有限元全波仿真软件HFSS系统研究了多重嵌套方形开口环数量对介电常数、磁导率和折射率的影响规律。结果表明,该超材料在8~18 GHz范围内的散射参数(S11和S21)具有显著的谐振特性,其内禀电磁参量也呈现出典型的双负左手特性,并得到了实验验证;且随着多重嵌套方形开口环数量的增加,其谐振峰数量也增加,当开口环数量为3时具有最大的有效频率带宽;进一步分析电磁场分布发现感应磁偶极子是导致强吸收的主要机制。这种结构简单、频率可调谐的超材料在选择性微波吸收材料和微波调制器件中具有广阔的应用前景。

摘要：我们报导我们分布式的反馈纤维激光上的最近的工作基于水中听音器。与敏感有关的一些问题例如纤维激光阶段状况，解调，并且包装，也被讨论。与适当数字信号处理(DSP ) 的发展技术和包装图案，一种 interferometric 类型散布了反馈(DFB ) 有 58.0 dB 敳獲? 慥档攠慮汢湩 ? 楤晦牥湥 ? 慭整楲污瀠潲散獳湩 ?敲楧敭 s

摘要：Biophysical restrictions regulate protein diffusion,nucleus deformation,and cell migration,which are all universal and important processes for cells to perform their biological ***,current technologies addressing these multiscale questions are extremely ***,through two-photon polymerization(TPP),we present the precise,low-cost,and multiscale microstructures(micro-fences)as a versatile investigating *** nanometer-scale printing resolution and multiscale scanning capacity,TPP is capable of generating micro-fences with sizes of 0.5-1000μ*** micro-fences are utilized as biophysical restrictions to determine the fluidity of supported lipid bilayers(SLB),to investigate the restricted diffusion of Src family kinase protein Lck on SLB,and also to reveal the mechanical bending of cell nucleus and T cell climbing *** together,the proposed versatile and low-cost micro-fences have great potential in probing the restricted dynamics of molecules,organelles,and cells to understand the basics of physical biology.

摘要：二基于硅紫外(紫外) 并且扩大蓝色的光电二极管被介绍，它为轻察觉被制作在紫外 / 蓝光谱范围。塑造条纹、八边形圆形的结构被设计验证 UV-responsivity 的参数，紫外选择，故障电压，和反应时间。极端浅的侧面的 pn 连接成功地在标准 0.5-m 被认识到扩大 pn 连接区域，提高紫外光的吸收，并且改进 responsivity 和量效率的互补金属氧化物半导体(互补金属氧化物半导体) 过程。说明的测试结果塑造条纹的结构有更低的故障电压，更高的 UV-responsicity，并且更高紫外选择。但是八边形圆形的结构有更低的黑暗电流。两结构的反应时间是几乎一样。

摘要：有限投影条件下激光吸收光谱二维测量光路优化对燃烧场重建结果具有重要影响.针对基于Tikhonov正则化的病态投影方程组求解问题,提出了基于正则化参数矩阵的光路设计与二维重建方法.建立了基于Tikhonov正则化参数矩阵的光路设计目标函数,利用遗传算法获得最佳光路布置方式,通过匹配光路与正则化参数分布对测量区域内正则化权重进行调整以减小重建误差.采用7185.6 cm^–1波段H2O特征谱线并结合20条投影光路对10×10离散化测量区域内双峰高斯分布模型进行了重建,对5种光路布置方式重建结果进行了对比分析,结果表明基于Tikhonov正则化参数矩阵的光路布置方式重建结果最佳.光路数量越少, Tikhonov正则化参数矩阵作用效果越明显.开展了针对气液两相脉冲爆轰发动机外流场的模拟测量研究,验证了本文光路布置方式在复杂多变流场环境下重建效果.在实验室内针对小型燃气炉进行了实验测试,重建燃烧场峰值位置和幅值与实际情况吻合.研究结果对于推动激光吸收光谱二维重建技术在发动机诊断及燃烧效率提升方面的应用具有重要意义.

摘要：This paper presents the design of a controller for the measurement and reduction of conducted Electro Magnetic Interference (EMI) caused in the power electronic circuits. The conducted EMI is also separating the Common Mode (CM) and Differential Mode (DM) simultaneously using Line Impedance Stabilization Network (LISN). EMI is mitigated by the fuzzy controller. By comparing common mode voltage with the standard reference value, the generated error can be minimized by using fuzzy controller. Fuzzy controller is varying the PWM signal of the power electronic switching devices for reducing the electromagnetic interference. In this paper, comparison of PI and fuzzy controller of the open loop and closed loop models are implemented using MATLAB&reg SIMULINK for measurement and reduction of the EMI level;and also simulation results of the PI controller and fuzzy controller analysis are presented in this paper. The fuzzy controller is provided to achieve the EMI level of the inverter within the standard limit.

摘要：Technology development and continuous down scaling in CMOS fabrication makes Mixed Signal Integrated Circuits (MSIC) more vulnerable to process variation. This paper presents a well defined novel design methodology for process variability aware design by incorporating the major challenge of statistical circuit performance relating the device and circuit level variation in an accurate and efficient manner to improve the reliability, robustness and stability of the circuit. The device sensitive parameters are identified and accurately quantified by continuous realistic assessments using statistical methods. The modularity of the methodology can be validated by the output performance obtained from the gain and phase response of OTA which is highly stable when subjected to worst case process variation scenario. In the proposed optimization, the circuit is strengthened by fixing the optimum aspect ratio without adding any additional compensation devices complicating the circuit resulting in low power consumption of only 0.116 mW in standard CMOS 0.18 μm technology with 1.8 V power supply.