We explore the possibility of using the surface plasmon polariton interference field to deposit neutral molecules onto a silver film perforated with two double-slits. The Monte Carlo simulated results show that the deposited molecular pattern is the periodic line array with a width resolution of ∼10 nm and a period of 530 nm when the molecular beam is well-collimated. Dependences of the deposition resolution on the system parameters, the potential applications and improvements are also discussed in some detail.
Background To explore the dynamic distribution of pupil size and center,the eccentricity distribution of angle kappa, and its correlation with other biomechanics about suitable for excimer laser refractive surgery. Methods Randomly selected 225 patients (407 eyes) who underwent femtosecond laser combined with excimer laser in situkeratomileusis,preoperative use of Wavelight Allegro Topolyzer Corneal Topography ( Wavelight Laser Technologies AG, Erlangen, Germany ) to measure the pupil size and center position, the German Wavelight EX500 excimer Laser (500Hz) records the deviation between the pupil center and the coaxially sighted corneal light reflex when the patient is supine. Results The average displacement distribution of P-Dist (the eccentricity between the pupil center and the coaxially sighted corneal light reflex point) is 0.225 ± 0.102 mm, and 80% of the eyes are ≤ 0.30 mm.The coaxially sighted corneal light reflex point is mainly deviated to the superior temporal side of the corneal center (34%).Under the dark light condition, the x-axis of the left eye was: -0.046 ± 0.091 mm, the x-axis of the right eye was: -0.152 ± 0.084 mm, with statistical difference ( P = 0.015) (the right eye shifted to the temporal side), the y-axis direction had no statistical change ( P = 0.062). The WTW was positively correlated with changes of pupil diameter (dark pupil diameter-bright pupil diameter) ( r = 0.270, P <0.001).The SE and measured centroid shift was negative correlated ( r = - 0.214, P = 0.002). Conclusion The pupil of the left eye becomes smaller, the anterior chamber becomes shallower, and the angle kappa increases relative to the right eye.In patients with large WTW, a darker light environment is maintained during the operation to improve the efficiency of pupil matching.The dynamic change of angle kappa in high myopia population is small.
Directional pattern is a clear visual representation form of antenna radiation characteristics. Taking a certain kind of shipborne radar as example, the basic principle of the directional pattern measurement was analyzed, the basic methods and execution scheme were introduced in detail. A directional pattern automatic testing system which was based on Lavbiew was researched on the basis of existed testing techniques, and finally the directional pattern automatic measurement was realized through the use of virtual instrument GPIB and serial interface techniques.
Aiming at the phenomenon that irreversible bright line and all screen black happens in the CCDs irradiated by pulsed laser, the resistance between driving electrodes and substrate was measured, damage micro-morphology of different layers in the facular area was observed, exported waveforms were detected, the damage mechanisms for CCD were analyzed in detail. The coming results show that high power pulse laser induced the ablation at different layers of CCD, increased the dark current and leakage current, which induced the failure of the device.
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