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1
Content available remote

Nonclassical Properties of Para-Bose Superposition States

100%
Yu Y., Wang D.
Acta Physica Polonica A
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2009
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vol. 115
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issue 3
613-616
EN
We investigate the nonclassical properties of para-Bose superposition states which involve the vacuum and one- or two-photon state of paraboson. It is found that these para-Bose superposition states exhibit stronger squeezing and antibunching. The amplitude-squared squeezing for these states is also examined.
2
Content available remote

Pulsed Power Technology for Pollution Control

81%
Namihira T., Wang D., Akiyama H.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
953-955
EN
Recently, the pulsed power technology led us to generate discharge plasma in high-pressure gas, liquid and solid environment. The discharge plasmas have a lot of functions such as an intense electric field, a large current flow, a chemically active radical formation, a shockwave generation, and an ultraviolet irradiation. Using the functions, the pollution control technologies, including exhaust gases treatment, ozone generation, water treatment, and material destruction or separation, were developed in laboratory. In the paper, the NO removal by ns pulsed discharge plasma and the aggregate recycling by the discharge inside of concrete would be introduced.
3
Content available remote

Performances of Nanosecond Pulsed Discharge

71%
Matsumoto T., Wang D., Namihira T., Katsuki S., Akiyama H.
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EN
The conventional methods such as selective catalytic reduction method, electron beam method and lime-gypsum method could not treat exhaust gases completely. In addition, the energy efficiency and the cost of the conventional ways are still unfavourable. In recent years, the pollution control techniques using electric discharge plasmas which attract attention as the low cost and high energy efficient exhaust gas treatment methods, have been widely studied. In our laboratory, pulsed streamer discharge plasmas which are one of the non-thermal plasmas have been used to treat exhaust gases. Since a pulse width of applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short pulse generator is of paramount importance for practical applications. In this work, nanosecond pulse generator which can output the 5 ns pulsed voltage is developed. In addition, the exhaust gas treatment and the ozone production by nanosecond pulse generator were demonstrated.
4
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Crystallization Process of Fe_{75}Co_5Zr_{10}B_{10} Amorphous Alloy

62%
Sun Y., Zuo B., Wang D., Meng X., Liu J., Wang L., Hua Z.
Acta Physica Polonica A
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2013
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vol. 124
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issue 4
685-687
EN
Fe_{75}Co_5Zr_{10}B_{10} amorphous alloy prepared by melt-spinning was annealed at various temperatures. The thermal property and microstructures were investigated by differential thermal analysis, X-ray diffraction, and transmission electron microscopy. The crystallization process of Fe_{75}Co_5Zr_{10}B_{10} amorphous alloy is complex. The α-Fe phase precipitates from the amorphous matrix in the initial stage of crystallization. The α-Mn type (χ) phase precipitates at 570°C, but transforms to α-Fe phase and the Laves C14(λ) phase at higher temperature. In the final stage of crystallization, Fe_3Zr, Fe_2Zr, and unknown phases are observed and the λ-phase disappears. The α-Fe phase preferentially nucleates after annealing at 530C for 10 min and the χ-phase preferentially nucleates after annealing at 600C for 10 min. The nucleation barrier of χ-phase is larger than that of α-Fe phase. The local structure of χ-phase is more similar to amorphous phase.
5
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Content available

Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel

62%
Tian J., Qu T., Wang D., Wang H., Xu Z., Xinrui E.
Archives of Metallurgy and Materials
|
2018
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vol. 63
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issue 4
6
Content available remote

Effect of Polarity and Rise Time of Applied Pulsed Voltage on Streamer Discharge Phenomena

62%
Yoshinaga K., Okada S., Wang D., Namihira T., Katsuki S., Akiyama H.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1050-1052
EN
Pulsed streamer discharges have been extensively used in many applications such as control of NO_X and SO_2 from exhaust gases, treatment of dioxins, removal of volatile organic compounds, generation of ozone and laser excitation. An operation with a high-energy efficiency is necessary for practical applications. It is very important to know the propagation mechanism of streamer discharges in order to improve the energy efficiency of pulsed discharge systems. In this paper, the emission from pulsed streamer discharges in a coaxial electrode system in air at 0.1 MPa was observed using a high-speed gated intensified charge-coupled display camera. A concentric wire-cylinder electrodes configuration was used. Positive and negative pulsed voltages having a width of about 200 ns were applied to the central electrode. From the results, the streamer discharges were initiated at the inner electrode and terminated at the outer electrode. It is suggested that the propagation velocity of the streamer discharges is being influenced strongly by the rise time and the polarity of the pulsed voltage.
7
Content available remote

Fabrication of High-Density GaN Nanowires through Ammoniating Ga_2O_3/Nb Films

62%
Zhuang H., Li B., Zhang S., Zhang X., Xue C., Wang D., Shen J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 2
723-730
EN
High-density GaN nanowires were successfully synthesized on Si(111) substrates through ammoniating Ga_2O_3/Nb films under flowing ammonia atmosphere at 950°C. The as-synthesized GaN nanowires are characterized by X-ray diffraction, selected-area-electron diffraction, Fourier transform infrared, scanning electron microscopy, and field-emission transmission electron microscopy. The results show that the synthesized nanowires are single-crystal hexagonal wurtzite GaN with diameters ranging from 30 to 100 nm and lengths up to several microns. The photoluminescence spectra measured at room temperature only exhibit a strong and broad emission peak at 367.8 nm. Finally, the growth mechanism of GaN nanowires is discussed.
8
Content available remote

Growth of β-Ga_2O_3 Nanorods and Photoluminescence Properties

62%
Zhang, S., Zhuang H., Xue C., Li B., Shen J., Wang D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 6
1195-1201
EN
β-Ga_2O_3 nanorods were successfully fabricated through annealing Ga_2O_3/Mo films deposited on the Si (111) substrate by radio frequency magnetron sputtering technique. The morphology and structure of the as-synthesized nanorods were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-rays spectroscopy. The results show that the formed nanorods are single-crystalline Ga_2O_3 with monoclinic structure. The diameters of nanorods are 200 nm and lengths typically up to several micrometers. A photoluminescence spectrum at room temperature under excitation at 325 nm exhibits two strong blue-light peaks located at about 413.0 nm and 437.5 nm, attributed to the recombination of bound electron-hole exciton in β-Ga_2O_3 single crystal. The growth process of the β-Ga_2O_3 nanorods is probably dominated by conventional vapor-solid mechanism.
9
Content available remote

Easy Vortex Motion in an Artificial Channel of YBa_2Cu_3O_{7-δ} Superconducting Films

62%
Jukna A., Barboy I., Jung G., Abrutis A., Li X., Wang D., Sobolewski R.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
959-962
EN
Quasi-Josephson effect produced by a coherent vortex motion in the horizontal part of the laser-performedΠ-shaped channel of a YBa_2Cu_3O_{7-δ} superconducting bridge was investigated by means of electric transport measurements. We observed that in our structures, in a limited range of temperatures and bias currents, the vortices were confined in the channel only and moved coherently with the velocity of 3×10^4 m/s. The corresponding current-voltage characteristics of the bridge exhibited Josephson-like voltage steps with the amplitude dependent on temperature, but independent of the bias current.
10
Content available remote

Nitric Oxide Generator Based on Pulsed Arc Discharge

62%
Sakai S., Matsuda M., Wang D., Namihira T., Akiyama H., Okamoto K., Toda K.
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EN
Nitric oxide (NO) is increasingly being used in medical applications. Currently, a gas cylinder of N_{2} mixed with a high concentration of NO is used in the NO inhalation system. However, this arrangement is potentially risky due to the possibility of accidental leak of NO from the cylinder. The presence of NO in air leads to the formation of nitric dioxide (NO_{2}), which is toxic to the lungs. Therefore, an on-site generation of NO would be very desirable for patients with acute respiratory distress syndrome and other related illnesses. Previously, our group reported the production of NO using a pulsed arc discharge. In this work, the prototype of the on-site NO generator was developed and the performances of the NO generator were demonstrated for medical applications.
11
Content available remote

Effect of Annealing Temperature and Ambient on Formation, Composition and Bandgap of Cu_2ZnSnS_4 Thin Films

62%
Sun Y., Yao B., Meng X., Wang D., Long D., Hua Z.
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vol. 126
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issue 3
751-756
EN
Amorphous Cu-Zn-Sn-S precursor films were prepared by sol-gel and spin-coating with copper chloride, zinc chloride, tin chloride and thiourea solutions as starting materials. A Cu_2ZnSnS_4 film with kesterite structure and a small amount of chlorine formed when the precursor was annealed under Ar ambient at temperature above 200°C, but its atomic ratios of Cu:Zn:Sn:S far deviated from stoichiometric ratios of the Cu_2ZnSnS_4. However, when the precursor films were annealed with sulfur powder together at temperatures between 360 and 480°C, the CZTS film containing a very small amount of Cl formed, and its atomic ratio change little for Cu, Zn, and Sn, increases for S and decreases for Cl with increasing temperature. When the temperature is 480°C, a CZTS only has Cu, Zn, Sn, and S element is fabricated, and the atomic ratio of Cu:Zn:Sn:S is near the stoichiometric ratio. The bandgap of the CZTS decreases with increasing annealing temperature. The mechanisms of the formation and the properties of the CZTS are suggested in the present work.
12
Content available remote

The Effect of Nb Content on the Thermal, Structural, and Magnetic Properties of FeNbB Ribbons

52%
Hua Z., Zuo B., Li M., Wang X., Wang L., Liu J., Wang D., Dong L.
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vol. 125
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issue 5
1149-1151
EN
Amorphous Fe_{80-x}Nb_{x}B_{20} (x = 5, 10, 15) ribbons were prepared by single-roller melt spinning method. The thermal, structural and magnetic properties of Fe_{80-x}Nb_{x}B_{20} (x = 5, 10, 15) ribbons were investigated using differential thermal analysis, X-ray diffraction, and vibrating sample magnetometer. The thermal stability is the lowest for Fe_{70}Nb_{10}B_{20} ribbon and the highest for Fe_{65}Nb_{15}B_{20} ribbon. Along with the increase of Nb content, the supercooled liquid region Δ T_{x} increases, indicating that the amorphous formation ability improves. The primary stages of crystallization of the three ribbons are different. The primary devitrification phases are Fe_{23}B_6 type for Fe_{70}Nb_{10}B_{20} and Fe_{75}Nb_5B_{20} ribbons, and α-Fe type for Fe_{65}Nb_{15}B_{20} ribbon. Fe_{80-x}Nb_{x}B_{20} (x = 5, 10) ribbons are ferromagnetic and the Fe_{65}Nb_{15}B_{20} ribbon is paramagnetic. The saturation magnetization (M_{s}) decreases with increasing Nb content.
13
Content available remote

Directed flow from global symmetry and initial state Fluctuations

52%
Csernai L., Skålvik A., Wang D., Strottman D., Anderlik C., Cheng Y., Yan Y., Sa B.
Open Physics
|
2012
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vol. 10
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issue 6
1271-1273
EN
Collective flow is studied in a 3+1D fluid dynamical model with globally symmetric, peripheral initial conditions, taking into account the shear flow. At $\sqrt {s_{NN} } $ = 2.76 TeV in semi-peripheral Pb+Pb collisions this leads to rotation, while at more peripheral collisions with high resolution and low numerical viscosity, the initial development of a Kelvin-Helmholz instability is observed. This effect provides a precision tool for studying the viscosity of Quark-Gluon Plasma.
14
Content available remote

Activation of Retrotransposon in Red Alga by Underwater Pulsed Discharge

52%
Hirayama K., Wang D., Matsuda M., Lin X., Namihira T., Takano H., Takio S., Akiyama H.
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EN
Retrotransposons are mobile genetic elements that accomplish transposition via an RNA intermediate. These elements can be transcriptionally activated by stress factors, such as UV light, ozone, pathogens, wounding and drought. A red alga, Porphyra yezoensis has recently been recognized as a model plant for fundamental and applied study in marine biological science. In this paper, pulsed streamer-like discharge in liquid was used as a new stress condition, and the transcriptional levels of retrotransposon and functional genes of a red alga, Porphyra yezoensis was investigated. From the results of reverse transcription-polymerase chain reaction (RT-PCR) experiments, it is clear that the transcriptions of retrotransposon and functional genes were activated by applying pulsed streamer-like discharge.
15
Content available remote

Coarse Aggregate Recycling by Pulsed Discharge Inside of Concrete

42%
Inoue S., Araki J., Aoki T., Maeda S., Iizasa S., Takaki M., Wang D., Namihira T., Shigeishi M., Ohtsu M., Akiyama H.
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EN
In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, new application using pulsed power discharge has been developed as the recycling method of the coarse aggregates from the waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate by the repetitive pulsed discharge treatments on the consumption energy were investigated. As the results, it was clear that the quality of the recycled coarse aggregate could be controlled by the number of discharge treatments. The recycled coarse aggregate, which satisfied class H under the regulations of Japan Industrial Standard (JIS A5005 and JIS A5021), was produced with the smallest consumption energy when the discharged energy from 0.02 μF of capacitor charged up to 400 kV applied to the waste concrete scraps during single discharge treatment.
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