Investigation on emission characteristics of metal-ceramic cathode applied to industrial X-ray diode

2016 ◽  
Vol 87 (6) ◽  
pp. 063301 ◽  
Author(s):  
Ma Xun ◽  
Yuan Jianqiang ◽  
Liu Hongwei ◽  
Li Hongtao ◽  
Wang Lingyun ◽  
...  
Keyword(s):  
Emission Characteristics ◽  
X Ray ◽  
Metal Ceramic

Structure and strong ultraviolet emission characteristics of amorphous ZnO films grown by electrophoretic deposition

2003 ◽  
Vol 18 (1) ◽  
pp. 151-155 ◽  
Author(s):  
Zhijian Wang ◽  
Haiming Zhang ◽  
Zhijun Wang ◽  
Ligong Zhang ◽  
Jinshan Yuan ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Indium Tin Oxide ◽  
Zno Films ◽  
Emission Characteristics ◽  
Photoluminescence Intensity ◽  
Ultraviolet Emission ◽  
X Ray ◽  
Glass Substrates ◽  
Strong Ultraviolet Emission ◽  
Zno Powder

Structure and ultraviolet emission characteristics of amorphous ZnO films grown on indium tin oxide coated glass substrates by electrophoretic deposition were investigated using Raman spectra and photoluminescence. The Raman spectrum shows a unique resonant multiphonon process within amorphous ZnO films. The photoluminescence spectrum of amorphous ZnO films shows a strong ultraviolet emission while the visible emission is nearly fully quenched. The transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectrum, and infrared spectrum are used to detect the structure of amorphous ZnO powder. The complex water plays an important role in the photoluminescence intensity emission.

scholarly journals X-ray Emission Characteristics of Pulsars

2000 ◽  
Vol 195 ◽  
pp. 49-60
Author(s):  
W. Becker
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Emission Characteristics ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Emission Properties ◽  
Important Progress

Recent X-ray observatories such as ROSAT, ASCA, RXTE, BeppoSAX, and Chandra have achieved important progress in neutron star and pulsar astronomy. The identification of Geminga as a rotation-powered pulsar, the discovery of X-ray emission from millisecond pulsars, and the identification of cooling neutron stars are only a few of the fascinating results. In the following, I will give a brief review on the X-ray emission properties of rotation-powered pulsars and their wind nebulae.

Fe–Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction

1994 ◽  
Vol 9 (1) ◽  
pp. 229-235 ◽  
Author(s):  
Ch. Laurent ◽  
J.J. Demai ◽  
A. Rousset ◽  
K.R. Kannan ◽  
C.N.R. Rao
Keyword(s):  
Hydrogen Reduction ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Total Reduction ◽  
Transmission Electron ◽  
Combined Use ◽  
Metal Ceramic ◽  
Different Temperatures ◽  
Metallic Species

Fe-Cr/Al2O3 metal-ceramic composites prepared by hydrogen reduction at different temperatures and for different periods have been investigated by a combined use of Mössbauer spectroscopy, x-ray diffraction, transmission electron microscopy, and energy-dispersive x-ray spectroscopy in order to obtain information on the nature of the metallic species formed. Total reduction of Fe3+ does not occur by increasing the reduction time at 1320 K from 1 to 30 h, and the amount of superparamagnetic metallic species is essentially constant (about 10%). Temperatures higher than 1470 K are needed to achieve nearly total reduction of substitutional Fe3+. Interestingly, iron favors the reduction of chromium. The composition of the Fe-Cr particles is strongly dependent on their size, the Cr content being higher in particles smaller than 10 nm.

High Speed Image Converter X-Ray Studies

1975 ◽  
Vol 19 ◽  
pp. 577-585
Author(s):  
V. Chamelton ◽  
G. Clément ◽  
J. P. Roux ◽  
J. P. Gex
Keyword(s):  
Energy Distribution ◽  
Time Resolution ◽  
High Speed ◽  
Plasma Heating ◽  
Initial Study ◽  
Emission Characteristics ◽  
Image Converter ◽  
Optical Pulses ◽  
Important Data ◽  
X Ray

Important data in the investigation of laser-produced plasmas will be provided by studies of the X-ray emission characteristics in the range 1-10 keV, with time resolution comparable to plasma heating times. Present techniques using conventional photomultipliers or photodiodes are not suitable for time measurements on plasma heated by short optical pulses of several hundred picoseconds or less. The development of new X-ray cameras is also necessary. Their photocathodes must be chosen with care. In this paper we describe an initial study of the characteristics of metallic photocathodes: quantum efficiency, energy distribution of emitted photoelectrons, etc. Then we worked out the provisional sensitivity, spatial and temporal resolution of cameras in the streak mode or in shutter mode.

scholarly journals Laser assisted selective chemical metalization of Al2O3 films

2005 ◽  
Vol 3 (4) ◽  
pp. 668-673
Author(s):  
Emil Krumov ◽  
Dimitar Popov ◽  
Nikolay Starbov
Keyword(s):  
Thermal Evaporation ◽  
Chemical Deposition ◽  
Ceramic Surface ◽  
Ceramic System ◽  
X Ray ◽  
Deposited Metal ◽  
Metal Ceramic ◽  
Selective Chemical ◽  
Processing Steps ◽  
Al2o3 Films

AbstractThick aluminum oxide films are prepared on Al plates by anodizing. On the ceramic surface thus obtained a very thin Ag film is deposited via vacuum thermal evaporation. The Ag/Al2O3/Al samples prepared are irradiated by Nd:YAG laser through a suitable metal mask in order to remove the top metal film in the exposed areas. Thus, a negative silver image of the copied mask is obtained. Further, the samples are processed in Ni electroless chemical bath activated by the rest of silver. All processing steps are studied by scanning electron microscopy (SEM). EDS X-ray mapping is applied to study the final distribution of Al and Ni in the processed areas. In addition, the DC conductivity of the fabricated Ni wires obtained is measured. The proposed new method for selective chemical deposition of electroconductive Ni onto laser microstructured Ag/Al2O3/Al samples is simple, versatile and not restricted to the metal/ceramic system studied as well as to the electroless deposited metal.

scholarly journals Influence of Silica Nano-Additives on Performance and Emission Characteristics of Soybean Biodiesel Fuelled Diesel Engine

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1489
Author(s):  
R. S. Gavhane ◽  
A. M. Kate ◽  
Manzoore Elahi M. Soudagar ◽  
V. D. Wakchaure ◽  
Sagar Balgude ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Emission Characteristics ◽  
X Ray Diffraction ◽  
Brake Thermal Efficiency ◽  
X Ray ◽  
Performance And Emission ◽  
Fuel Blends ◽  
Soybean Biodiesel ◽  
Performance And Emissions ◽  
Nano Additives

The present study examines the effect of silicon dioxide (SiO2) nano-additives on the performance and emission characteristics of a diesel engine fuelled with soybean biodiesel. Soybean biofuel was prepared using the transesterification process. The morphology of nano-additives was studied using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). The Ultrasonication process was used for the homogeneous blending of nano-additives with biodiesel, while surfactant was used for the stabilisation of nano-additives. The physicochemical properties of pure and blended fuel samples were measured as per ASTM standards. The performance and emissions characteristics of different fuel samples were measured at different loading conditions. It was found that the brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) increased by 3.48–6.39% and 5.81–9.88%, respectively, with the addition of SiO2 nano-additives. The carbon monoxide (CO), hydrocarbon (HC) and smoke emissions for nano-additive added blends were decreased by 1.9–17.5%, 20.56–27.5% and 10.16–23.54% compared to SBME25 fuel blends.

Microstructure of Bonding Interface in Explosively Welded Metal/Ceramic Clad

2010 ◽  
Vol 638-642 ◽  
pp. 3775-3780 ◽  
Author(s):  
Seiichiro Ii ◽  
Chihiro Iwamoto ◽  
Shinobu Satonaka ◽  
Kazuyuki Hokamoto ◽  
Masahiro Fujita
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Silicon Nitride ◽  
Electron Diffraction ◽  
Electron Diffraction Pattern ◽  
Explosive Welding ◽  
Bonding Interface ◽  
X Ray ◽  
Transmission Electron ◽  
Metal Ceramic

Bonding interface in aluminum (Al) and silicon nitride (Si3N4) clad fabricated by explosive welding has been investigated by transmission electron microscopy (TEM). The nanocrystalline region was clearly observed at the interface between Al and Si3N4. Electron diffraction pattern and energy dispersive X-ray spectroscopy (EDS) measurements across the interface revealed that this nanocrystalline region consist of the only aluminum.

Radiographic and spectroscopic studies of X-pinch plasma implosion dynamics and x-ray burst emission characteristics

2001 ◽  
Vol 8 (4) ◽  
pp. 1305 ◽  
Author(s):  
T. A. Shelkovenko ◽  
D. B. Sinars ◽  
S. A. Pikuz ◽  
D. A. Hammer
Keyword(s):  
Spectroscopic Studies ◽  
Emission Characteristics ◽  
X Ray ◽  
Pinch Plasma ◽  
Burst Emission

Preparation and Field Emission Characteristics of CNx Nanotubes Thin Film

2005 ◽  
Vol 475-479 ◽  
pp. 3595-3598
Author(s):  
Lan Zhang ◽  
Hui Zhong Ma ◽  
Xue Xiang Li ◽  
Ning Yao ◽  
Bing Lin Zhang
Keyword(s):  
Thin Films ◽  
Field Emission ◽  
Electron Emission ◽  
Photoelectron Spectroscopy ◽  
Microwave Plasma ◽  
Field Electron Emission ◽  
Emission Characteristics ◽  
Flow Ratio ◽  
X Ray ◽  
Field Electron

Carbon nitride nanotubes (CN-NT) thin films were prepared on Ni-Cr coated glass substrate by microwave plasma enhanced chemical vapor deposition at a relatively low temperature of 600～650 °C. The morphology of the films were observed by scanning electron microscopy. The microstructure of the film were analyzed by x-ray photoelectron spectroscopy, x-ray diffraction, and Raman spectroscopy. The characteristics of field emission of CN-NT thin films were measured. Experimental results indicate that the film structure and properties of the field electron emission are related to flow ratio of N2 to CH4. When the flow ratio of N2 to CH4 was 3.3, the obtained film had a better field electron emission characteristics. The turn-on field of the film was 3.7 V/µm . The current density was 413.3 µA/cm2 at an electric field of 8 V/µm.

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