半线性椭圆互补问题的上解与下解(英文)

本文针对半线性椭圆互补问题,提供几种获取该问题的一个上解和下解的方式.在求解过程中,仅仅需要求解一个线性互补问题或线性方程组.所得结果可应用于众多单调算法的初始化.     

Non-Uniformity of Ion Implantation in Direct-Current Plasma Immersion Ion Implantation

A particle-in-cell simulation is developed to study dc plasma immersion ion implantation. Particular attention is paid to the influence of the voltage applied to the target on the ion path, and the ion flux distribution on the target surface. It is found that the potential near the aperture within the plasma region is not the plasma potential, and is impacted by the voltage applied to the implanted target. A curved equipotential contour expands into the plasma region through the aperture and the extent of the expansion depends on the voltage. Ions accelerated by the electric field in the sheath form a beam shape and a flux distribution on the target surface, which are strongly dependent on the applied voltage. The results of the simulations demonstrate the formation mechanism of the grid-shadow effect, which is in agreement with the result observed experimentally.     

谱约束下反自反矩阵的最佳逼近问题

该文研究了反自反矩阵的逆特征值问题及其最佳逼近问题,建立了反自反矩阵的逆特征值问题有解的充要条件,得到了解的表达式.进一步,对于任意给定的n阶复矩阵,得到了相关最佳逼近问题解的表达式.     

硕螽(Deracantha onos)的发声与听觉

本文利用声分析与神经电生理学方法研究了硕螽(Deracantha onos)鸣声的基本特征、发声机理和听觉灵敏度。硕螽以每秒30—33次的速率运动复翅,主要靠复翅闭合运动时左翅上的音锉与右翅的刮器相摩擦而发声。移去部分锉齿,不影响支配复翅运动神经元的活动节律。音锉脉冲列是硕螽鸣声的基本成分,它由一个开翅脉冲和11—13个闭翅齿脉冲组成。刮器与音锉的每个齿撞击产生一个振荡波,称为齿脉冲。齿脉冲速率约为450次每秒,鸣声的频谱较宽,主要能量分布在6—30kHz范围内;主能峰位于12—14kHz。10cm远处鸣声强度约为110dB L_p。硕螽听觉最佳灵敏度在12—15kHz,最低阈值为35dB L_p听觉的窄带通性质表明硕蠢具有良好的频率选择性。     

SONG PRODUCTION AND HEARING IN THE BUSHCRICKET DERACANTHA ONOS(ORTHOPTERA,TETTIGONIIDAE)

The basic features of song pattern,stridulatory mechanism and auditory sensitivity in thebushcricket species Deracantha onos were studied with sond analysis and neurophysiologicaltechniques.The bushcricket uses an elytro-elytral mechanism of sound production:a denticulatedvein(file)on the under-surface of the left elytron is rubbed by the inside edge(plectrum)of the rightelytron at the rate of 30—33/s.Removing a few teeth does not influence the rhythm of the motorneurons innervating the elytra.The file-train of pulses is the element of calling song of D.onos.Eachfile-train of pulses is composed of one elytra-opening pulse and 11 to 13 elytra-closing tooth pulses.Each tooth impact of the file at the plectrum elicts a damped oscillation called"tooth pulse".The rateof tooth pulses is about 450/s.The frequency spectrum of the song covers a wide frequency bandmainly between 6 and 30 kHz with a predominant peak at 12 to 14 kHz.Song intensity is about 110 dBat 10cm from the animal.The best sensitivity of heari