〠Instrument R & D 】 In 1895, German physicist Roentgen discovered that X-ray, physics, chemistry, biology, material science and many other scientific fields have ushered in a new way of studying material composition and structural information. Research advances in the field of X-rays such as characteristic X-rays, X-ray diffraction, X-ray spectroscopy, X-ray photoelectron spectroscopy, etc. have made X-ray instruments an indispensable device for modern scientific research. In the development of X-ray instruments, in addition to the theoretical study of X-ray physical characteristics, the development of the instrument itself cannot be ignored.
X-ray detector is one of the core components of X-ray instrument. As an integral part of the X-ray imaging system, the X-ray detector is responsible for converting X-ray energy into an electrical signal that can be recorded. The conversion efficiency of the X-ray detector has a critical impact on the performance and sensitivity of the X-ray instrument. Therefore, X-ray detectors have always been one of the breakthrough directions of X-ray instrument researchers.
Perovskite single crystals based on organic-inorganic hybrids have excellent carrier transmission properties, photoelectric conversion efficiency, and high absorption coefficients for X-rays. They are very suitable as semiconductor active materials in X-ray detectors. The research focus of the detector. However, due to the influence of factors such as device structure and manufacturing process, the perovskite single crystal will have problems of large dark state current and difficulty in suppressing noise after being applied to the X-ray detector.
In order to solve the deficiency of organic-inorganic hybrid perovskite single crystals as semiconductor active materials for X-ray detectors, the research team led by Professor Lei Wei of Southeast University prepared perovskite with concentration gradient characteristics based on solution epitaxial growth The cascade crystal X-ray photodiode uses the epitaxial process to solve the problems existing in the interface of the solution method device.
With the help of scanning electron microscopy and transmission electron microscopy, the research team used perovskite single crystals composed of different halogens with lattice constant mismatch rate less than 0.5% as intrinsic layers, N-type layers and P-type layers. The N-type layer, the intrinsic layer, and the P-type layer are epitaxially grown from the bottom up to obtain a cascade-type perovskite single crystal with excellent interface performance, and a low-noise, low-dose and high-resolution X-ray detector is prepared.
The X-ray detectors prepared by the research have extremely high sensitivity and fast response speed for medical high-energy X-rays of 100-140 keV, and low-dose chest CT and brain CT detectors have important reference significance. The idea of ​​improving the preparation method of perovskite single crystal by epitaxy based on the solution method can also be applied to the research and development of semiconductor devices in the field of high-energy ray detection.
Source: X-MOL
CNC CONTINUOUS HORIZONTAL Foaming Machine can be used for continuous producing Flexible Polyurethane Foam(maxfoam),
which density is 9~50KGS/M³. It can be automatic cutting the foam into difference sizes
which is according to client`s requirement. It can be realized numerical control with accurate
and convenient ration during the whole production. It becomes more easily and stable to
operate the machine.
ï‚ Computerized control system
It can be realized numerical control during the whole production. It is very easy to
operate with its humanization consideration design. It is able to store 100 formulations in
advance.
ï‚ Automatic formulation function
The computer can be automatic to generate formulation for your reference and
calculate the dosage of material if you input the density and color which you need. The
computer can be automatic to check if the formulation is correct when you give the input of
material.
ï‚ Costing function
The computer can be automatic to display the input of chemical material and the output
of foams in each foaming produce.
ï‚ Printing function
All information including the formulation, the input of chemical material and the output of
foams can be printed. The exact data can be used to strengthen management.
ï‚ Electronic metering system
The metering system is adopted the advance electronic metering pumps from U.S.A.
and the monitoring equipment. Through computer, it can display formulation`s dosage of 12
groups` chemical material and actual supply in figure or diagram. The metering system can
be automatic to adjust it with great precision when the actual supply cannot meet the
formulation requirement. It is the base to produce the good foam and to reduce the
unnecessary wastage with this function.
ï‚ High speed mixing system
It adopts two steps mixing with low-pressure and high-speed. This can make the
foam`s air hole fine and smooth. It presets cycle cooling and automatic cleaning functions.
ï‚ Adjustable oven system
The width of two moving side wall can be adjusted for producing difference width foam.
The height of six steps raising platform can be adjusted for producing difference density
foam.
ï‚ Automatic cutting system
It is computerized control. It can be changing the cutting length in any time. The degree
of accuracy can be equal or less than 1mm.
Automatic thermostat apparatus (optional)
It can maintain the suitable temperature of chemical material in order to producing high
quality foam.
Technical Specification:
Model SL-08FC
Chemical 12groups
Foaming type Trough foaming/Spray foaming
Speed of mixing ≤5000rpm/ min
Over length 12.5M
Fall plate 6 steps total 6.25M
Conveyor length 18M
Foam width 1.3-2.25m
Foam height ≤1.25M
Foming speed ≤8m/min
Max output 250kgs/min
Total power 70.85KW
Dimension 38m(L)×4.5m(W)×4m(H)
Continuous Foaming Machine
Foam Molding Machine,Pu Foam Making Machine,Continuous Foaming Machine,Continuous Foam Production Machine
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