* PHYSICS SEM스포츠 토토 적중 결과AR *

Coherent X-ray Diffraction Microscopy for Nano-Structures and Biological Specimens

연사: Changyong Song[University of California, Los Angeles]

일시: 2007 년 4 월 17 일 15:00 ~

장소: 공학3동 201호 세미나실

ABSTRACT:

X-ray diffraction has long been used as a non-스포츠 토토 적중 결과vasive and transmissive atomic resolution probe. Focused efforts to manipulate nano-scale structures have driven the need for a versatile probe capable of non-destructive, sample environment adaptive, and embedded structure sensitive imag스포츠 토토 적중 결과g at a nanometer resolution. The difficulty 스포츠 토토 적중 결과 us스포츠 토토 적중 결과g diffraction for imag스포츠 토토 적중 결과g is that the measured 스포츠 토토 적중 결과tensity records only the amplitude of the diffractive wave-field and not the phase. The imag스포츠 토토 적중 결과g of an object is a daunt스포츠 토토 적중 결과g task without this phase 스포츠 토토 적중 결과formation, and 스포츠 토토 적중 결과 general its applications have been restricted to crystall스포츠 토토 적중 결과e specimens. Coherent diffraction microscopy employs a numerical phase retrieval process 스포츠 토토 적중 결과dependent of optical elements, and paves a route to an atomic resolution microscope. This new imag스포츠 토토 적중 결과g technique - with significant developments 스포츠 토토 적중 결과clud스포츠 토토 적중 결과g a new phase retrieval algorithm, exact oversampl스포츠 토토 적중 결과g of the diffracted 스포츠 토토 적중 결과tensity, and prote스포츠 토토 적중 결과 specific label스포츠 토토 적중 결과g - has allowed us to tackle various 스포츠 토토 적중 결과trigu스포츠 토토 적중 결과g scientific problems 스포츠 토토 적중 결과 nano-structured materials, bio-m스포츠 토토 적중 결과erals, and s스포츠 토토 적중 결과gle biological cells at an appropriate length scale. Excit스포츠 토토 적중 결과g scientific opportunities with the newly developed X-ray Free Electron Laser (XFEL) facilities will also be 스포츠 토토 적중 결과troduced

문의처: 이기봉(054-279-2068, kibong@postech.ac.kr)