a better understanding of the mechanism of chromosomal aberration formation could be obtained by using dna repair inhibitors. immortalized normal human (mrc 5 svi) and ataxia telangiectasia ( at 5 biv a ) fibroblastic cell lines were treated with adenosine arabinoside (ara-a) and cytosine arabinoside (ara-c), both potent inhibitors of dna dsb repair, alone or in combination with x-rays at g2 or...

The aberration of a multipole Wien filter for energy-filtered x-ray photoemission electron microscopy was analyzed and the optimized Fourier components of the electric and magnetic fields for the third-order aperture aberration corrections were obtained. It was found that the third-order aperture aberration correction requires 12 electrodes and magnetic poles.

The precision and work efficiency of the distributed repeat projection lithography machine (DSW) directly affect special requirements large-scale integrated circuit production process. In order to improve exposure imaging accuracy projection, paper proposes object image difference in-situ detection (AMF) technology based on particle swarm optimization. article analyzes basic principles this usi...

By optimum combination of optical pre-processing and digital post-processing, or optical coding and digital decoding of the image information, incoherent optical systems invariant to numerous aberrations can be formed. The theory of aberration invariance can also be used with low-cost, low-precision optics to produce systems that image with the performance of high-cost, high-precision, or near ...

The wave aberration of human eyes is retrieved from actual point-spread-function (PSF) data and the modulus of the pupil function. The PSF had been obtained previously by application of a hybrid optical-digital method developed recently. The retrieval is done by using a bidimensional Gerchberg-Saxton phase-retrieval algorithm joined to an iterative phase-unwrapping algorithm. To obtain an adequ...

background: most of our current understanding of the biological effects of exposure to ionising radiation is based on conventional cytogenetic techniques, which enable us to determine the relationship between chromosomal aberration and dose received by radiation workers. however, conventional techniques have numerous limitations and chromosomal aberrations can be easily missed. since fish plays...

Aberration correction in the TEM is now relatively well established with more than 20 corrected instruments installed worldwide. This paper will review these instrumental advances and will also describe the underlying theory and computation required to optimise data acquisition and interpret aberration corrected images. Finally the combination of direct electron optical correction and indirect ...