scholarly journals Influence of light intensity on the lifetime of carriers in silicon investigated by a photoacoustic method

2016 ◽  
Vol 24 (2) ◽  
Author(s):  
L. Bychto ◽  
M. Maliński
Keyword(s):  
Light Intensity ◽  
Measurement Method ◽  
Experimental Results ◽  
Low Intensity ◽  
Photoacoustic Method ◽  
Type Silicon ◽  
Silicon Crystals

AbstractThe paper presents experimental results of the lifetime of light induced excess carriers in the n−type silicon. The lifetimes of carriers of silicon crystals were analysed as a function of the intensity of light illuminating the sample. As a measurement method of the lifetime of carriers, the photoacoustic method in a transmission configuration with different surfaces was used. The dependence character was next analysed in the frame of the Shockley Reed Hall statistics in approximation of the light low intensity.

scholarly journals Effect Factors of Benzene Adsorption and Degradation by Nano-TiO2Immobilized on Diatomite

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Lijun Cheng ◽  
Yong Kang ◽  
Guishui Li
Keyword(s):  
Relative Humidity ◽  
Light Intensity ◽  
Experimental Results ◽  
Benzene Adsorption ◽  
Effect Factors ◽  
Benzene Concentration ◽  
Effects Of Temperature ◽  
Safe Concentration

Difference between adsorption of benzene by diatomite and nano-TiO2immobilized on diatomite was investigated. And effects of temperature, light intensity, relative humidity, and initial benzene concentration on adsorption and degradation of benzene by nano-TiO2immobilized on diatomite were also studied. The experimental results showed that when initial benzene concentration was2.2×10−3 mg L−1, it could be degraded to below safe concentration (1.1×10−4 mg L−1) after 50 h when temperature was 20°C, but it just needed 30 h at 35°C. When light intensity was 6750 Lx, it needed 30 h for benzene to be degraded to below safe concentration, but benzene could barely be degraded without light. When relative humidity was 50%, benzene could be degraded to1.0×10−4 mg L−1after 30 h, while its concentration could be reduced to7.0×10−5 mg L−1at the relative humidity of 80%.

Internal friction and Mössbauer study of C–Cr associates in MANET steel

1997 ◽  
Vol 12 (2) ◽  
pp. 296-299 ◽  
Author(s):  
P. Gondi ◽  
R. Gupta ◽  
R. Montanari ◽  
G. Principi ◽  
M. E. Tata
Keyword(s):  
Internal Friction ◽  
Slow Rate ◽  
Structural Model ◽  
Martensitic Steel ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Mössbauer Study ◽  
Low Intensity ◽  
Magnetic Pattern ◽  
Bcc Phase

Internal friction and Mössbauer techniques have been used to investigate the structure of C–Cr associates and the arrangement of Fe atoms near them in the Cr martensitic steel MANET subjected to different thermal treatments. After slow rate cooling from the austenitic field, the Mössbauer spectra exhibit, besides the complex magnetic pattern of martensite, a low intensity singlet attributed to the presence of a Cr-rich bcc phase. In correspondence, the internal friction curves, show, among others, a Snoek-type peak due to anelastic processes involving C–Cr associates with 6 Cr atoms. To explain the experimental results, a simple structural model is suggested.

Advanced oxidation of methyl tert-butyl ether (MTBE) by UV/TiO2 and H2O2-UV/TiO2 processes

2006 ◽  
Vol 6 (2) ◽  
pp. 77-85 ◽  
Author(s):  
C.-H. Hung
Keyword(s):  
Light Intensity ◽  
Degradation Rate ◽  
Reaction Rate ◽  
Experimental Results ◽  
Methyl Tert Butyl Ether ◽  
H2o2 Concentration ◽  
Pseudo First Order Reaction ◽  
Butyl Ether ◽  
Solution Ph ◽  
Degradation Rates

This study investigated photocatalysis of MTBE via both UV/TiO2 and H2O2-UV/TiO2 processes. Several experimental parameters including pH level, H2O2 concentration, TiO2 dosage and light intensity were investigated. The experimental results demonstrated the degradation of MTBE following a pseudo first-order reaction in both reaction systems. Faster degradation rates were observed in alkaline solution for the UV/TiO2 system, but for the H2O2-UV/TiO2 system, faster degradation rates were detected in acidic solution. More dosage of TiO2 and irradiated light intensity were beneficial for the photocatalysis of MTBE. However, a peak reaction rate was observed at a TiO2 concentration of about 500 mg/L. The experimental results also indicated that the degradation rate of MTBE was enhanced by the addition of H2O2. H2O2 could be a more efficient electron acceptor than oxygen for retarding recombination of electron–hole pairs. The degradation rate in the H2O2-UV/TiO2 system was about 2.8 times faster than that in the UV/TiO2 system for solution pH below 5, and the rate increased 30% for solution pH above 6. In addition, it is observed that the reaction rate of MTBE increased quickly with H2O2 concentration at low H2O2 dosages, but the rate was independent of H2O2 dosage when adding too much H2O2.

A Direct Measurement Method of Building’s Shunt Coefficient

2012 ◽  
Vol 241-244 ◽  
pp. 885-888
Author(s):  
Xiao Chun Zhang ◽  
Xiu Bin Sun ◽  
Xiang Yong Mou
Keyword(s):  
Direct Measurement ◽  
Measurement Method ◽  
Pulse Current ◽  
Induction Coil ◽  
Experimental Results ◽  
Current Generator ◽  
Digital Oscilloscope ◽  
Direct Measurement Method

The shunt coefficient of a model of constructions was measured by a pulse current generator, an induction coil, a digital oscilloscope. The experimental results demonstrate that the method is effective, the distribution of pulse current in a buildings can be directly measured without damage.

Grown-in microdefects and photovoltaic characteristics of heavily Ge co-doped Czochralski-grown p-type silicon crystals

2013 ◽  
Vol 69 (9) ◽  
pp. 686-689 ◽  
Author(s):  
Mukannan Arivanandhan ◽  
Raira Gotoh ◽  
Kozo Fujiwara ◽  
Satoshi Uda ◽  
Yasuhiro Hayakawa ◽  
...  
Keyword(s):  
Type Silicon ◽  
Silicon Crystals ◽  
P Type ◽  
Photovoltaic Characteristics ◽  
Co Doped

A Temperature Measurement Method Based on RC Discharge Circuit Using Platinum Resistance

2014 ◽  
Vol 1037 ◽  
pp. 143-146
Author(s):  
Xiao Qiong Zuo ◽  
Jian Ping Jia ◽  
Juan Lei
Keyword(s):  
Temperature Measurement ◽  
Measurement Method ◽  
Low Cost ◽  
Measuring Method ◽  
Experimental Results ◽  
Discharge Circuit ◽  
Platinum Resistance ◽  
Discharge Time ◽  
Temperature Resistance ◽  
Temperature Measuring

This paper proposes a temperature measuring method of low cost and stable precision based on platinum resistance. RC discharge circuit is composed of platinum resistor and fixed capacitor,the discharge time of fixed capacitance in the circuit is used for calculating the platinum resistance temperature resistance. The experimental results show that this is a simple and low cost method .

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