调宽控制平台稳定系统对陀螺漂移影响的研究

介绍了在平台式惯导系统中,由脉冲调宽加矩方式控制的惯性稳定平台的角振动对陀螺漂移的因素,通过对平台稳定系统的动态仿真,得出了它螺漂移与采用脉宽调制工作的稳定回路参数之间的关系,为惯性平台稳定回路的设计提供重要的数据依据。     

OSMAR2000相控阵天线的分析与设计

从工程应用的角度出发,详细分析了OSMAR2000天线阵列的设计原理,为高频地波雷达海洋环境监测系统成功设计了一发八收、收发共用的天线阵列系统。理论分析和实验结果说明了本文设计方案的可行性。     

高性能和强扩展性的太赫兹时域光谱仪的研制

太赫兹波具有低能、宽带和独特的时域脉冲特性等特点,使其在材料物质科学领域具有着重要的应用价值.自主搭建了一套基于光电导天线的太赫兹时域光谱仪.从介绍光电导天线产生和探测太赫兹波的原理出发,重点阐述了太赫兹时域光谱仪的光路设计优化、搭建调试、功能拓展和应用实例分析,为自主研制高性能太赫兹时域光谱仪提供了方法和经验.     

Effect of radio frequency field on toroidal plasma parameters

Low temperature plasma parameters in a toroidal magnetic field are measured. The effect of an externally applied perpendicular electric field on the plasma parameters is studied. The lifetime of the plasma is measured in the presence and absence of the RF electric field. Decrease in the plasma lifetime in the presence of RF field is attributed to detrapping of the primary electrons to a larger volume. Plasma lifetime increases when a small vertical magnetic field is added to the toroidal magnetic field.     

A quasioptical doubler-array

The design of a planar quasioptical doubler configuration with an output frequency of 290 GHz is presented. Frequency conversion is realized with a monolithic Schottky — varactor array. Coupling of electromagnetic energy from beam waveguide to chip and vice versa is carried out with integrated antenna arrays. Electromagnetic field calculations describe coupling effects between the single array elements. RF—measurements of multiplier performance are also presented.     

Millimeter Wave Antenna with Scanning Beam

The results of theoretical analysis and experimental investigation of the millimeter waves antenna with scanning beam are presented. The operation concept of the antenna is based on the effect of transformation of the surface waves of dielectric waveguide in the volume waves. The smooth space scanning of beam has been made by means of change of wave propagation constant inside of the dielectric waveguide. All experiments were made in the four-millimeter wave range. The angle of scanning was =35° and width of directional diagram was 2° in the scanning plane. The lens and the mirror antennas were designed.     

Laser pulse control of exciton dynamics in the FMO complex: Polarization shaping versus effects of structural and energetic disorder

Femtosecond laser pulse control of exciton dynamics in biological chromophore complexes is studied theoretically using the optimal control theory specified to open quantum systems. Based on the laser pulse induced formation of an excitonic wave packet the possibility to localize excitation energy at a certain chromophore within a photosynthetic antenna system (FMO complex of green bacteria) is investigated both for linearly polarized and polarization shaped pulses. Results are presented for an ensemble of N energetically disordered and randomly oriented FMO complexes. Here, the optimized control pulse represents a compromise with respect to the solution of the control task for any individual complex of the ensemble. For the case of an ensemble with N=10 members the polarization shaped control pulse leads to a higher control yield compared with a linearly polarized pulse. This difference becomes considerably smaller for an ensemble with N=120 members. The respective optimized pulses are used to drive excitation energy in a different ensemble with MN complexes to simulate the usual experimental condition in solution. For the case with N=120, the relative control yield coincides with the resulting control yield “in solution”, giving a slightly higher control yield for polarization shaped pulses.     

Antenna patterns of an open structure mixer at a submillimeter wavelength and of its scaled model

To verify the enhancement in sensitivity of a Schottky barrier diode using a 90° corner reflector at submillimeter wavelength a 651 scaled model of the open structure mixer was constructed and investigated at 2.8 cm wavelength.The results show clearly the advantage of a 90° corner reflector, the reality of the deviations for 45° and 60° corner reflectors found for submillimeter wavelengths, and the equality of the antenna patterns for a 90° corner reflector and a cat-eye (corner cube) reflector.     

On a Problem of Byrnes concerning Polynomials with Restricted Coefficients

We consider a question of Byrnes concerning the minimal degree of a polynomial with all coefficients in which has a zero of a given order at . For , we prove his conjecture that the monic polynomial of this type of minimal degree is given by , but we disprove this for . We prove that a polynomial of this type must have , which is in sharp contrast with the situation when one allows coefficients in . The proofs use simple number theoretic ideas and depend ultimately on the fact that .

     

对称吡啶双酰胺及其稀土配合物的合成、表征与荧光性质的研究

以元素分析、红外光谱、差热及核磁进行表征了配体及其五种稀土（La^3＋,Eu^3＋,Tb^3＋,Gd^3＋,Yb^3＋）配合物,确定了其组成,研究了部分配合物的固态荧光.同时以低温磷光光谱确定了配体的三重态能级为22989 cm^-1,研究了配体与稀土离子的能级匹配情况,详细讨论了配合物的发光性能.结果发现,铽配合物能发出很强的特有荧光,而铕配合物所发荧光很弱,说明配体L与Tb^3＋ 的^5D4匹配.对于Tb^3＋而言,当2000 cm^-1〈ΔE（T-^5D4）〈3000 cm^-1时,稀土铽离子发出强的荧光;对于Eu^3＋ 而言,ΔE（T-^5D1）超过3000 cm^-1时,则几乎不发荧光.