皮卡，小业主高人一等的品位选择

严波在所有人眼里绝对是一个异类。2003年他毕业于中山大学法律系后，没有去找工作而是选择了自己创业，更让人们大跌眼镜的是，严波竟然筹集了3万元资金在解放中路的五金市场上开了一家规模不大不小的五金店。

“庄严”一词梵汉对勘

“庄严”这个词的意义比较复杂。鸠摩罗什的《小品般若波罗蜜经》中“庄严”出现了46次,经过梵汉对勘,确认其意义有与现有解释相同的,也有少许不同的。这一对勘的结果表明,研究佛经词语的意义,仅用汉文佛典材料是不够的。

Application of rigorous coupled-wave theory on quality analysis of natural jadeite

In order to make more available methods for natural jadeite quality evaluation,this study applied rigorous coupled wave theory to calculate and simulate the reflection characteristics of various natural jadeites,and establish evaluation standard based on the relationship between refractive index and reflectivity and responses of reflection efficiency to refractive index,grating thickness and incident angles,etc.The results suggest that reflection efficiency varies significantly as a function of the natural jadeite quality,which can provide a new method to evaluate natural jadeite.

Resonant Effects of FPL and SPP for Light Transmitting through Subwavelength Metallic Gratings

A new model is proposed to explain the physical mechanism of the extraordinary transmission enhancement in subwavelength metallic grating.The extraordinary transmission enhancement is described by the co-operation of Fabry-Perot-like(FPL) resonance and the surface plasmon polariton(SPP) resonance.The rigorous coupled-wave analysis(RCWA) and the finite difference time domain(FDTD) method are employed to illustrate the model by calculating the transmission and the field distributions in the subwavelength metallic grating,respectively.And the numerical calculations show that transmission enhancement is achieved when the coupling resonance of the incident light,the surface plasmon polariton mode and the Fabry-Perot-Like mode is happened,which are in good agreement with the proposed model.

Exact Solution to the Equation of Motion of a Charged Particle Driven by an Electrostatic Wave

An exact solution is derived for the equation of motion of a charged particle driven by an electrostatic wave.The explicit expression of particle velocity is obtained,and the trapping condition of the charged particle in the electrostatic wave is also derived exactly.The interaction between the charged particle and the electrostatic wave is discussed,which is a supplement to the existing textbook of plasma physics.The results are of interest to particle accelerators,microwave tubes,and basic plasma processes.

温暖的灵魂 美丽的疼痛

去年沸津扬扬的一场官司，让一个刚刚起步的歌者——严波一度走入音乐事业上的困境。在经过了蛰伏之后，他开始重整行囊，再发上路了。

COSMIC GPS observations of topographic gravity waves in the stratosphere around the Tibetan Plateau

Temperature profiles provided by the Constellation Observing System for Meteorology, Ionosphere and Climate （COSMIC） global positioning system （GPS） satellite constellation were used to study an eight-year series （2007 to 2015） of gravity wave （GW） potential energy in the stratosphere （18-30 kin） around the Tibetan Plateau （TP）. We found that with increasing altitude, the GW potential energy （Ep） values in the stratosphere caused by convection decreases. The importance of GWs that are stimulated by topography is enhanced in this area. In the TP, which was considered to lack strong topographical GW activity, clear activity existed in the spring and winter of all studied years. Based on the latitudinal zone of the TP, the distribution of GW potential energy is highly consistent with the elevation of the local topography. The activities of topographical GWs are strongly filtered as they propagate upward to the area of zero speed wind. The analysis indicates that in the TP, clear orographic GW excitation exists and propagates upward to the upper stratosphere, where it is greatly influenced by the wind.

Lattice-parameter effects on diffracted transmission of GaN two-dimensional square-lattice photonic crystals

The lattice-parameter effects on the diffracted transmission of GaN square-lattice photonic crystals （2PhC） at the wavelength of 460 nm were studied by using a rigorous coupled wave analysis （RCWA）. The impacts of lattice parameters on the diffracted transmission are calculated in the ranges for lattice pitch from 100 nm to 2000 nm, fill factor from 0.1 to 0.9 and grat- ing height from 100 nm to 1000 rim, respectively. Our simulation results confirm that the lattice pitch is the dominant factor of the diffraction. It determines how many orders of diffraction occur by the 2PhCs. The larger the lattice pitch, the higher the diffraction orders come into play. Moreover, besides the first-order Bragg diffraction, higher diffraction orders from large pitches of PhCs are also beneficial to the light extraction improvement. The higher enhancement factors of the integrated transmission were obtained from a wide range of pitches with micro-scale GaN 2PhCs. Three different diffraction mechanisms through wave vector analysis were used to discuss the simulation results.

Design of an Optical Water Pollution Sensor Using a Single-Layer Guided-Mode Resonance Filter

The optical characteristics of a simple, planar, single layer, dielectric Mg-based guided mode resonance filter （GMRF） were investigated by means of rigorous-coupled wave analysis （RCWA）. This filter has great potential for real-life applications, especially as bio- and environmental sensors. The structure of the proposed sensor is compact, and all of its layers can be grown in a single process. In this paper, we present results on the design of a water pollution sensor in the violet region of the visible spectrum. The spectral and angular sensitivities of the sensor for both the transverse electric （TE） and transverse magnetic （TM） polarization modes were estimated and compared for various regions in the violet spectrum. A spectral response characterized with a narrow bandwidth and low reflection side bands was realized by carrying out extensive parameter search and optimization. Optimal spectral and angular sensitivities were found for the sensor with a grating thickness of 100nm in the TM polarized mode where we found them to be 100nm and 40 degrees, per index refraction unit, respectively.

Reflective terahertz tunable polarization controller

This paper proposes an optical device which can continuously change the polarization state of terahertz （THz） waves. The device consists of metal gate, anU-refleetlon coatings, liquid crystal and mirror. By changing the refractive index of liquid crystal in the interface between the metal gate and the mirror, the phase difference between two beams with orthogonal polarization is varied and a continuous phase sliift is achieved. The phase shift of the device is calculated by using the finite difference time domain （FDTD） method, and the transmittance and reflectance are calculated by using the rigorous coupled wave analysis （RCWA） method. The results reveal that the structure can realize continuously tunable phase shift for THz wave at 1 THz.

Nondestructive characterization of the domain structure of periodically poled lithium niobate crystal based on rigorous coupled-wave analysis

We report rigorous coupled-wave analysis(RCWA) method to non-destructively characterize the domain structure of periodically poled lithium niobate(PPLN) crystal. The strong light diffraction effect is achieved by applying a proper external voltage. We can observe reversed domain pattern and employ the detected diffraction intensity to optimally fit the result of RCWA based on least square method. Compared with conventional scalar diffraction theory, more accurate domain structure parameters with accuracies of 0.05 μm and 0.005 for the period and duty cycle are obtained respectively. It is proved that accurate, real-time and nondestructive characterization can be realized via this method.

Improving Gravity Anomalies Over China Marginal Sea from Retracked Geosat and ERS-1 Data

The quality of altimeter data and ocean tide model is critical to the recovery of coastal gravity anomalies. In this contribution, three retracking methods (threshold, improved threshold and Beta-5) are investigated with the aim of improving the altimeter data over a shallow water area. Comparison indicates that the improved threshold is the best retracking method over China Sea. Two ocean tide models, NAO99b and CSR4.0, are analyzed. Results show that different tide models used in the processing of altimeter data may result in differences more than 10 mGal in recovered coastal gravity anomalies. Also, NAO99b is more suitable than CSR4.0 over the shallow water area of China Sea. Finally, gravity anomalies over China Sea are calculated from retracked Geosat/GM and ERS-1/GM data by least squares collocation. Comparison with shipborne gravimetry data demonstrates that gravity anomalies from retracked data are significantly superior to those from non-retracked data. Our results have the same order as the other two altimeter-derived gravity models: Sandwell&Smith(V16) and DNSC08.