阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。 A microscope(显微镜)is a useful instrument for observing small objects by producing a bigger image. The microscope shows details that cannot be seen by the naked eye(肉眼). Before using the microscope, please ...
Ruska understood that electron wavelengths are far shorter than light wavelengths and believed that, if he could find a way to apply this knowledge, he could develop a far more powerful microscope. Together with Knolls, he developed the first electromagnetic lens, which focused a beam of electrons...
Image processing does not require high graphical processing power or large datasets for execution. Deep neural network: A deep neural network is generally a supervised learning algorithm that requires large datasets and high GPU computation power to predict object classes. It’s a more accurate way ...
An atomic force microscope (AFM) is an extremely precise microscope that images a sample by rapidly moving a probe with a nanometer-sized tip across its surface. This is quite different than an optical microscope which uses reflected light to image a sample. An AFM probe offers a much higher...
This video is currently unavailable What do we know about the King's diagnosis? A biopsy is a medical procedure that involves taking a small sample so it can be examined under a microscope to identify whether there are abnormal cells present. ...
Image 1 of 5 Tardigrades can be seen clearly under a microscope.(Image credit: Papilio / Alamy Stock Photo) Tardigrades eat by sucking fluids from cells by puncturing the walls with little needle-like structures in their mouths. (Image credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY via Getty...
Focus stacking is one technique to retain a good depth of field with macro images. Simply take the same photo at different focus distances – one each with the ladybird’s antennae, wings and legs in focus – and combine the best of each part for a great image. Some cameras can do this...
An image on a transparent base for projection on a screen. Slide One of a series of images projected digitally as part of a presentation. Slide A small glass plate for mounting specimens to be examined under a microscope. Slide A fall of a mass of rock, earth, or snow down a slope; ...
A mental image produced by the imagination. 1 Focus The state or quality of having or producing clear visual definition His face is rather out of focus The incident brought her feelings for Alexander sharply into focus Vision The faculty of sight; eyesight Poor vision. Focus One of the fixed...
The creation of these sub-nanopores is explained as being due to amorphization, destruction of molecular bonds, and a decrease in the density of the PET polymer in the central part of the track as a result of the outgassing of volatile products caused by the influence of swift electrons ...