摘要:
A transmission electron microscope makes it possible to search for defects without applying an undesirable treatment to a specimen by using a reference specimen prepared separately from a specimen to be observed. A pair of specimen holders (24a, 24b) detachable from the column (21) of the electron microscope are adjacently arranged at upper and lower stages respectively along the electron beam axis to position the specimens closely to each other in an electron beam illuminating position. The pair of holders can be independently set to or removed from the electron beam illuminating position. The specimen holders include devices for selectively finely adjusting the spacing between the specimens, the angle of the specimens with respect to the electron beam axis and with respect to a plane perpendicular to the electron beam axis.
摘要:
The invention relates to a method and an apparatus for gas analysis, particularly for calibrating gas analysis devices with calibration gases containing very low concentrations of a liquid sample vapor at a ppb level. According to the invention, the method comprises the following steps:
- putting in the concentration of a sample gas in a calibration gas (18) into a computer system (40) to permit the system to calculate the flow rate (L3) of a zero gas (20) to be mixed with sample gas, - supplying the zero gas (20) from a zero gas source (19) to a main tube (12), - supplying the sample gas from a sample gas generating device (6) to the main tube (12) to mix the sample gas with the zero gas (20) in the main tube (12), - controlling the flow rate of the zero gas (20) through flow control means (25) of the zero gas (20) by a set flow rate signal (43) of the calculated flow rate (L3) fed from the computer system (40) the thereby generate the calibration gas (18) to an analysis device (41), and - feeding a data input-starting signal (46) from the computer system (40) to the analysis device (41), and feeding a data signal (47) from the analysis device (41) to the computer system (40).
摘要:
Focusing that abundant class genes abundantly present in a nucleic acid sample can comparatively easily be analyzed and readily be removed in a selective manner, a nucleic acid sample for expression analysis of rare expressed genes can be obtained by removing abundant genes therefrom, and analyses based upon the sample can be achieved.
摘要:
The invention relates to a method and an apparatus for gas analysis, particularly for calibrating gas analysis devices with calibration gases containing very low concentrations of a liquid sample vapor at a ppb level. According to the invention, the method comprises the following steps: - putting in the concentration of a sample gas in a calibration gas (18) into a computer system (40) to permit the system to calculate the flow rate (L3) of a zero gas (20) to be mixed with sample gas, - supplying the zero gas (20) from a zero gas source (19) to a main tube (12), - supplying the sample gas from a sample gas generating device (6) to the main tube (12) to mix the sample gas with the zero gas (20) in the main tube (12), - controlling the flow rate of the zero gas (20) through flow control means (25) of the zero gas (20) by a set flow rate signal (43) of the calculated flow rate (L3) fed from the computer system (40) the thereby generate the calibration gas (18) to an analysis device (41), and - feeding a data input-starting signal (46) from the computer system (40) to the analysis device (41), and feeding a data signal (47) from the analysis device (41) to the computer system (40).