The new interpretation of support vector machines on statistical learning theory

This paper is concerned with the theoretical foundation of support vector machines (SVMs). The purpose is to develop further an exact relationship between SVMs and the statistical learning theory (SLT). As a representative, the standard C-support vector classification (C-SVC) is considered here. More precisely, we show that the decision function obtained by C-SVC is just one of the decision functions obtained by solving the optimization problem derived directly from the structural risk minimization principl...     

ADMISSIBILITY IN THE GENERAL GROWTH CURVE MODEL WITH RESPECT TO RESTRICTED PARAMETER SETS UNDER MATRIX LOSS FUNCTION

In this paper, we study the issue of admissibility in the growth curve model with respect to restricted parameter sets under matrix loss function. We obtain some neces- sary and sufficient conditions that the linear estimators of KBL are admissible in the class of homogeneous linear estimators and in the class of non-homogeneous linear estimators under the growth curve model with respect to restricted parameter sets, respectively.     

顺变柱体型全光纤加速度检波器

介绍了顺变柱体型全光纤加速度检波器的工作原理及结构设计，该检测器包括两个顺变柱体和一个质量块，两顺变柱体上都紧紧地绕着单模光纤，形成了迈克耳孙干涉仪的两个臂，两干涉臂的端面镀有高反铝膜，初步测试结果表明，检波器在共振频率以上有较好的频率响应，输入信号与输出信号吻合得较好。     

Heterodyne direct-detection OOFDM system with low sampling rate

A method of multi-channel receiving for high bit rate heterodyne direct-detection optical orthogonal frequency-division-multiplexing （OOFDM） system is proposed to reduce the sampling rate demand of analog-to-digital converter （ADC）. The sampling rate of ADCs can be reduced to 1/N that of the original signal bandwidth in an N-channel receiving system. Aided by a succeeding digital signal processing （DSP） at the receiver, aliasing free signal can be recovered. A back-to-back experimental result is given for a 4-channel system, based on which, a down conversion process for heterodyne can be reduced. The signal rebuilding algorithm is given and analyzed in its complexity and noise tolerance.     

驻波的能量分析与MATLAB模拟

分析了驻波能量、能量密度、能流密度在传播过程中的转换规律.用Matlab程序实现了驻波波形、能量密度、能流密度的计算机模拟,形象地展现了驻波传播过程中的能量变化,计算机模拟结果与理论分析所得结果一致.最后得到了在振动过程中驻波能量不断地从波节到波腹间相互转移,而从整体看驻波不传播任何能量的结论.     

基于垂直谐振腔结构的半导体光放大器理论分析

由新型垂直腔半导体光放大器（VCSOAs）器件结构出发,在反射模式和透射模式两种 情况下,计算了VCSOAs的分布布拉格反射堆（DBR）反射率、单程增益与增益、带宽的关系 ,其中DBR反射率的增大伴随着增益的上升,但也伴随着带宽的减小.通过引入增益-带宽 积的概念,以均衡增益与带宽.计算中表明:10 dB以上增益,50 GHz以上带宽可以实现. 计算结果与文献实验相吻合,对优化VCSOAs的结构设计和性能有所裨益.     

Non-invasive monitoring of living cell culture by lensless digital holography imaging

A non-invasive detection method for the status analysis of cell culture is presented based on digital holography technology.Lensless Fourier transform digital holography (LFTDH) configuration is developed for living cell imaging without prestaining.Complex amplitude information is reconstructed by a single inverse fast Fourier transform,and the phase aberration is corrected through the two-step phase subtraction method.The image segmentation is then applied to the automatic evaluation of confiuency.Finally,...     

Compact and high-power broadband terahertz source based on femtosecond photonic crystal fiber amplifier

We present a review of the development of a compact and high-power broadband terahertz (THz) source optically excited by a femtosecond photonic crystal fiber (PCF) amplifier.The large mode area of the PCF and the stretcher-free configuration make the pump source compact and very efficient.Broadband THz pulses of 150 μW extending from 0.1 to 3.5 THz are generated from a 3-mm-thick GaP crystal through optical rectification of 12-W pump pulses with duration of 66 fs and a repetition rate of 52 MHz.A strong saturation effect is observed,which is attributed to pump pulse absorption;a Z-scan measurement shows that three-photon absorption dominates the nonlinear absorption when the crystal is pumped by femtosecond pulses at 1 040 nm.A further scale-up of the THz source power is expected to find important applications in THz nonlinear optics and nonlinear THz spectroscopy.     

苯酚磺酞类酸性染料与人血清白蛋白的结合

在人体条件下 ,用荧光光谱法研究了苯酚磺酞类酸性染料苯酚红、甲酚红、氯酚红、溴甲酚紫、间甲酚紫与人血清白蛋白 (HSA)之间的相互作用。实验表明 :苯酚磺酞类酸性染料对人血清白蛋白的荧光有较强的猝灭作用 ,其荧光猝灭主要为静态猝灭 ,从荧光猝灭结果求得不同温度下各染料与HSA的结合常数K ,发现染料取代基的引入使K值增大 ,且随反应温度上升K值下降。由染料与HSA反应焓变、熵变 ,确定染料与HSA的结合主要是静电引力。依据非辐射能量转移机理 ,探讨了不同温度下该类染料与HSA相互结合时 ,其给体 受体间距离和能量转移效率。进一步证实了该类反应为单一静态猝灭过程 ,且阐明了其猝灭机理是通过能量转移产生的。     

Synthesis,Characterization and Biological Activities of Novel Acrylamide Compounds

With dimethomorph and flumorph as the leading compounds, four novel acrylamide compounds with two types of structure were designed and synthesized by means of the method of ＂me too chemistry＂. The target compounds were characterized by 1H NMR, IR, MS, and elemental analysis. The influences of solvent and raw material on the yield were investigated and optimum processing conditions were determined. The results of preliminary biological tests show that all those compounds exhibit certain antifungal activities.