The 388.2 nm spectral line was selected as the analysis line based on the analysis of laser induced breakdown spectroscopy of Al2O3and its samples containing rapeseed oil. The calibration curve between spectral intensity and oil content was established by measuring the oil content of 5 rapeseed and its laser induced breakdown spectroscopy. The calibration curve was y=264.17x-10 077.16. The correlation coefficient R2was 0.982 and the detection limit was 0.096%. The results showed that the laser induced breakdown spectroscopy measurement of rapeseed oil content was feasible.

液晶光栅作为一种光学相控阵被应用在激光雷达、卫星通信等系统中，可以实现激光束的灵活偏转。而要对定向光束的质量进行控制，必须对液晶光栅相控阵的波前进行测试，仿真结果可为液晶光栅性能的评价及波前测试提供参考。

用线性化近似方法,计算了具有色关联的色抽运噪声和色量子噪声驱动的光学双稳系统的光强相对涨落,讨论了噪声间的关联和输入信号对光强相对涨落的影响,发现光强相对涨落随抽运噪声强度和量子噪声强度的变化过程中存在极小值,且光强相对涨落与噪声间的关联程度密切相关,但输入信号对其影响不大.

液晶光栅加电后形成的相位轮廓是二元台阶形状。为测试液晶光栅的相位轮廓以保证液晶光栅的工作性能，采用闪耀级次(+1级)的近场衍射光场逆衍射计算方法并运用 Matlab 仿真来反演出液晶光栅的相位轮廓，提出了基于菲涅尔逆衍射的反演液晶光栅相位轮廓方法。衍射光场逆衍射反演得到的相位轮廓与模拟实际应用中的二元光栅相位轮廓的差值均方差精度验证了液晶光栅衍射光场逆衍射计算方法切实可行、准确。该方法不仅可以用来测试液晶光栅的相位轮廓，在液晶光栅工作性能下降时，也可作为分析、调试液晶光栅相位轮廓的一个非常有用的工具。

应用以探索和研究为基础、师生互动、自主学习的研究性教学理念,以创造在合作环境下进行探究式学习的条件、实现教师与学生的对话、对学生进行综合培养和训练、为学生后续学习打好基础为目标,论述了新生研讨示范课程《物理学概论》教学目标、教学内容、教学过程与方法和教学评价等4个方面的设计方案:教学目标从知识积累、技能和能力培养及职业认识提升等3方面来进行设计;教学内容共设计物理学史、物理学研究内容以及与其他学科发展和技术进步的关系、物理学研究方法和学习方法、物理教师的人文素养和教学方法、与中学物理教师的对话等5个模块;教学过程围绕教学目标和任务设计了师生共同提出问题、学生分组选题、师生论述和辩论、学生独立完成课程论文等4个步骤;教学评价设计了考核方案和教学效果评价方案。

Using the linear approximation method, we calculate the intensity correlation function and the output signal-tonoise ratio (SNR) by adding a modulated wave to light intensity equation of a single mode laser system driven by the periodic force of modulating noise. Through the numerical calculation and analysis of the SNR, we find that the lowfrequency modulation frequency Ω, the high-frequency carrier frequency ω, and the frequency of periodic force Ωλ have a significant effect on the SNR. In particular, multi-peak stochastic resonances and strong single-peak resonance with low-frequency modulation frequency Ω appear in the SNR. When Ω ω, the system exhibits multi-peak resonance and the distance between the resonance peaks increases with the increase of Ωλ, but the position of peak is invariant. When Ω → ω, the output SNR R increases rapidly, the effect of Ωλ becomes weak or negligible, and multi-peak resonance disappears. When Ω = ω, a strong single-peak resonance appears in the system. In addition, the SNR varies with the decrease of amplitude of the multi-peak stochastic resonance, and with the SNR changes with carrier frequency the single-peak stochastic resonance appears in the system.

As the third generation solar cells, quantum dot sensitized solar cells (QDSSC) has received wide attention from researchers because of its high theoretical energy conversion efficiency and low production costs. The preparation of CdS quantum dots for TiO2 inverse opal based QDSSC by successive ionic layer absorption and reaction (SILAR) was investigated. The optimized number of SILAR cycle and ionic reaction time was obtained by the analysis of absorption spectra.

在经典的存在生境破坏的集合种群模型的基础之上,考虑了关联乘性色噪声和加性白噪声对集合种群稳定性和平均灭绝时间的影响.应用Fokker-Planck方程得到了系统的稳态概率密度函数的解析表达式,利用平均首次通过时间的定义和最快下降法,得到了平均灭绝时间的表达式.对计算结果的数值分析表明:(1)加性白噪声强度Q的增加弱化了集合种群系统的稳定性,即内部噪声的增加对集合种群产生消极影响;(2)乘性色噪声强度D起到弱化集合种群稳定性的作用,即外界环境的波动对种群产生不利影响;(3)乘性色噪声自关联时间τ的增加增强了集合种群系统的稳定性,即τ可以使集合种群占据生境斑块的比例增加,并促使xs位置处占据生境斑块的比例的概率增加,对集合种群生存繁衍起到有利作用;(4)当两噪声之间的互关联为负关联(λ＜0)时,T(xs→x0)是关于D的单调减函数,即[λ|的增加弱化了集合种群的稳定性;当噪声间正关联(λ＞0)时,T(xs→x0)是关于D的非单调函数,随着D的增大,T(xs→x0)出现类似共振峰的极大值,表现出“随机共振”的现象;(5)T(xs→x0)是关于τ的单调增函数.

As the third generation solar cells, quantum dot sensitized solar cells (QDSSC) has received wide attention from researchers because of its high theoretical energy conversion efficiency and low production costs. The preparation of CdS quantum dots for TiO 2 inverse opal based QDSSC by successive ionic layer absorption and reaction (SILAR) was investigated. The optimized number of SILAR cycle and ionic reaction time was obtained by the analysis of absorption spectra.

By virtue of the Liouville equation and Novikov theorem,the approximate Fokker-Planck equation was derived,and the analytic expression of the stationary probability distribution(SPD) was obtained in an asymmetric bistable system driven by cross-correlated multiplicative white noise and additive white noise with periodic signal.Based on the computed results,effects of the following parameters,including intensity of noises and their correlation,the amplitude and frequency of the periodic signal,and the asymmetric parameter of system on the SPD were investigated.Numerical results show that:1) The intensity of noises and their correlation,amplitude of periodic signal,and asymmetric parameter of the system can induce the SPD transition from bimodal to unimodal in structure,i.e.,a non-equilibrium phase transition is generated.2) There is no non-equilibrium phase transition as frequency of the periodic signal varies.3) The structure of the SPD exhibits a symmetrical structure at x=0 in the case of r=0,while the symmetry of SPD at x=0is destroyed if the asymmetric parameter of the system r(?)0.

We propose an efficient approach to generate intense isolated attosecond pulses, which is based on the double optical gating mechanism of using two-color polarization-gating driving pulses. A relatively intense second harmonic field is added to the fundamental pulse and microscopically enhances the high harmonic emission insider polarization-gating. In the high harmonic generation, Bessel–Gauss beams are employed to macroscopically improve the propagation dynamics in both temporal and spatial domains. The results shows that, compared with the traditional Gaussian case, Bessel–Gauss beams can produce well phase-matched supercontinuum in the plateau region, and efficient isolated attosecond pulses with high spatiotemporal quality can be obtained successfully.

量子点敏化太阳电池(QDSSC)因具有高理论能量转换效率和低生产成本而受到研究者的广泛关注.简述了QDSSC的基本结构和工作原理,详细评述了基于半导体氧化物薄膜特别是TiO2和ZnO光阳极结构优化的QDSSC的研究进展,并结合目前QDSSC阳极结构研究中遇到的问题对今后基于光阳极优化的QDSSC发展进行了展望.

根据现代教学理论所提倡的自主、合作、探究的学习方式，新课标理念“从生活走向物理，从物理走向社会”，本文对大学物理课程《电磁感应定律》一节进行了较详细的设计。

By virtue of Liouville Theorem and unified colored-noise approximation approach, an approximate Fokker-Planck equation for a tree growth Logistic model subjected to cross-correlated colored noises is derived, and the steady-state probability distribution (SPD) function is obtained. The steady-state properties of the Logistic model are analyzed. We find the following: (1) the position of peak of SPD moves toward left side as D increases while the position of the peak moves toward the contrary direction with Q increasing; (2) the peak of SPD becomes narrow and grows in height as |λ| increases, and for the case of λ >0, the position of peak moves toward right as D increases, but it is opposite for the case of λQ increases.

研究了关联噪声和周期信号共同驱动下非对称双稳系统的稳态性质和各阶矩.根据刘维方程、诺维科夫原理等方法,得到了系统相应的福克-普朗克方程,并计算了相应的稳态概率分布函数P.(x)的表达式.定义R=D/Q(其中,D是乘性噪声强度,Q是加性噪声强度),分3种情况(R=1,R＞1,R＜1)讨论了周期信号振幅A和频率Ω对系统定态性质和各阶矩的影响.结果表明:①当R=1时,Pst(x)随态变量x变化的三维图呈现1条等高的双峰曲线,且态变量的各阶矩均处于3种情况所对应的3条曲线的最上方;②当R＞1时,Pst(x)随态变量x变化的三维图呈现1条左低右高的不对称双峰曲线,且态变量的各阶矩均处于3种情况所对应的3条曲线的最下方;③当R＜1时,Pst(x)随态变量x变化的三维图呈现1条左低右高的不对称双峰曲线,且态变量的各阶矩均处于3种情况所对应的3条曲线的中间位置上.

Using the linear approximation method,the intensity correlation function C(t) of a single mode laser system was calculated and the time evolution of C(t) was researched as well as the influence of modulation signal frequency Ω and amplitude B on C(t) was analysed in detail.In the case of the pump noise self-correlation time τ1,it was found that when modulation signal frequency Ω and amplitude B increase,the time evolution of C(t) experiences monotonous descending;however,in the case of τ1,as modulation signal frequency Ω and amplitude B increasing,the time evolution of C(t) exhibits periodically surging with descending envelope.

In this paper, the problem of estimating the fluorescence background of a Raman spectrum was addressed. We proposed to remove the fluorescence background via curve fitting. Furthermore, wavelet packet transform was chosen to compress Raman spectra data in case the data need large space to store and long time to search. We presented two methods for data processing in Raman spectroscopy of high methoxy Pectin. As a result, both of them performed well and could provide a reference in data processing for Raman spectra.

Sudan red dyes, as illegal food additives, can induce carcinoma of bladder. It is important to find out a method to provide an easy, precise and sensitive detection. The aim of our study is to obtain the Raman feature frequency excursion of SudanI, IIand III, and draw clear Raman spectra. We used the Raman Systems R-3000 spectrometer to detect the solid SudanI(97.5%), II(analytical pure) and III(97.0%). Furthermore, we removed the fluorescence background via curve fitting. The Raman spectrograms show that wave peak of Sudan Iappears on 458, 718, 990, 1091, 1163, 1224, 1335, 1385, 1450, 1492, 1593cm-1, peak of Sudan IIappears on 454, 708, 982, 1225, 1378, 1492, 1602cm-1, and peak of Sudan III appears on 456, 716, 981, 1127, 1227, 1383, 1415, 1437, 1492, 1591cm-1. In conclusion, Raman spectroscopy is an ideal measure to provide qualitative analysis of Sudan red dyes. And the results can help us to evaluate the food quality and safety.

The intensity of correlation function and signal-to-noise ratio(SNR)of an aborptive optical bistability system driven by a periodic signal are studied.from analyzing the SNR,the stochastic resonance phynomenon of SNR with the change of pump noise self-correlation time was found,both decreasing the intensity of quantum noise and increasing the intensity of pump noise,can increase the stochastic resonance phynomenon.

By adopting the linear approximation method,the signal-to-noise ratio of optical bistability system driven by colored pump noise and colored quantum noise was calculated. The influence on the signal-to-noise ratio of the pump noise intensity(P),quantum noise intensity(Q),pump noise self-correlation time (τ1) and quantum noise self-correlation time (τ2) was studied. The stochastic resonance was found in the curve of signal-to-noise ratio R versus the pump noise self-correlation time (τ1) was discussed,while the great influence on the stochastic resonance is posed by quantum noise self-correlation time,when (τ2) increases,the curve of signal-to-noise ratio R versus the pump noise self-correlation time (τ1) upgrates integratedly,and resonance-peak increases.It could prolong the quantum noise self-correlation time (τ2) to increase the signal-to-noise ratio R.There is a maximum in the curve of signal-to-noise ratio R versus the parameter of the optical bistability system c,while pump noise self-correlation time (τ1) greatly influences the curve of signal-to-noise ratio R versus the parameter of the optical bistability system c. With the increase of pump noise self-correlation time (τ1),the maximum declines and the curve becomes flat.It is indicated that the signal-to-noise ratio increases through reducing the pump noise self-correlation time (τ1).Besides,signal-to-noise ratio R monotonously increases with the increase of pump noise intensity P,and motonously decreases with the increase of quantum noise intensity Q.