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Yanggu, South Korea

EB Technology CO. | Date: 2010-06-15

Disclosed is a mobile type electron accelerator which enables a high voltage generator and a beam extraction device irradiating electron beams, and a reactor to be safely placed in containers mounted on trailers of a vehicle having mobility so as to allow a sample (for example, waste water, waste gas, and a sample to be investigated) to be tested in real time while maximally suppressing danger of environmental pollution or radiation exposure, thereby assuring rapidity, field applicability, and accuracy.

Huang C.-N.,National Sun Yat - sen University | Bow J.-S.,EB Technology Co. | Zheng Y.,National Sun Yat - sen University | Chen S.-Y.,I - Shou University | And 2 more authors.
Nanoscale Research Letters | Year: 2010

Titanium oxide compounds TiO, Ti 2O 3, and TiO 2 with a considerable extent of nonstoichiometry were fabricated by pulsed laser ablation in water and characterized by X-ray/electron diffraction, X-ray photoelectron spectroscopy and electron energy loss spectroscopy. The titanium oxides were found to occur as nanoparticle aggregates with a predominant 3+ charge and amorphous microtubes when fabricated under an average power density of ca. 1 × 10 8 W/cm 2 and 10 11 W/cm 2, respectively followed by dwelling in water. The crystalline colloidal particles have a relatively high content of Ti 2+ and hence a lower minimum band gap of 3.4 eV in comparison with 5.2 eV for the amorphous state. The protonation on both crystalline and amorphous phase caused defects, mainly titanium rather than oxygen vacancies and charge and/or volume-compensating defects. The hydrophilic nature and presumably varied extent of undercoordination at the free surface of the amorphous lamellae accounts for their rolling as tubes at water/air and water/glass interfaces. The nonstoichiometric titania thus fabricated have potential optoelectronic and catalytic applications in UV-visible range and shed light on the Ti charge and phase behavior of titania-water binary in natural shock occurrence. © 2010 The Author(s).

Kim J.H.,Chungnam National University | Sohn Y.,Yeungnam University | Kim I.,EB Technology Co. | Han B.,EB Technology Co. | Shin W.G.,Chungnam National University
Aerosol and Air Quality Research | Year: 2012

This study presents a novel use of an electron beam irradiation system for the gas phase synthesis of nanoparticles, and demonstrates that SiO2 nanoparticles can be synthesized in ambient conditions. The formation of SiO2 nanoparticles is confirmed by the vibrational modes shown in FT-IR spectra, and the binding energy of Si 2p in the X-ray photoelectron spectrum. In this work, nanoparticles with average diameters of 210 nm and 73 nm were produced. The average particle size was controlled by adjusting the residence time of the precursor vapor. © Taiwan Association for Aerosol Research.

Min J.,Korea Advanced Institute of Science and Technology | Pua R.,Korea Advanced Institute of Science and Technology | Kim I.,EB Technology Co. | Han B.,EB Technology Co. | Cho S.,Korea Advanced Institute of Science and Technology
Medical Physics | Year: 2015

Purpose: A beam-blocker composed of multiple strips is a useful gadget for scatter correction and/r for dose reduction in cone-beam CT (CBCT). However, the use of such a beam-blocker would yield cone-beam data that can be challenging for accurate image reconstruction from a single scan in the filtered-backprojection framework. The focus of the work was to develop an analytic image reconstruction method for CBCT that can be directly applied to partially blocked cone-beam data in conjunction with the scatter correction. Methods: The authors developed a rebinned backprojection-filteration (BPF) algorithm for reconstructing images from the partially blocked cone-beam data in a circular scan. The authors also proposed a beam-blocking geometry considering data redundancy such that an efficient scatter estimate can be acquired and sufficient data for BPF image reconstruction can be secured at the same time from a single scan without using any blocker motion. Additionally, scatter correction method and noise reduction scheme have been developed. The authors have performed both simulation and experimental studies to validate the rebinned BPF algorithm for image reconstruction from partially blocked cone-beam data. Quantitative evaluations of the reconstructed image quality were performed in the experimental studies. Results: The simulation study revealed that the developed reconstruction algorithm successfully reconstructs the images from the partial cone-beam data. In the experimental study, the proposed method effectively corrected for the scatter in each projection and reconstructed scatter-corrected images from a single scan. Reduction of cupping artifacts and an enhancement of the image contrast have been demonstrated. The image contrast has increased by a factor of about 2, and the image accuracy in terms of root-mean-square-error with respect to the fan-beam CT image has increased by more than 30%. Conclusions: The authors have successfully demonstrated that the proposed scanning method and image reconstruction algorithm can effectively estimate the scatter in cone-beam projections and produce tomographic images of nearly scatter-free quality. The authors believe that the proposed method would provide a fast and efficient CBCT scanning option to various applications particularly including head-and-neck scan. ©2015 American Association of Physicists in Medicine.

Kim Y.,EB Technology Co. | Kim J.,EB Technology Co. | Han B.,EB Technology Co. | Choi J.-S.,Korea Dyeing Technology Center | Lee M.-J.,Korea Atomic Energy Research Institute
Journal of the Korean Physical Society | Year: 2011

Textile dyeing processes consume a great amount of water and steam and discharge filthy and colored wastewater. Increased use of assorted dyes and other chemicals has increased the pace of reequipping purification facilities by applying efficient methods based on radiation technology. Based on laboratory data, a pilot-scale e-beam plant was constructed at the Daegu Dyeing Industrial Complex (DDIC) in 1998. An electron accelerator, 40 kW at 1 MeV, was used for 1,000 m3 per day. Continuous operation of this plant showed that the preliminary e-beam treatment reduced the bio-treatment time and resulted in significant decreases in the TOC (total organic carbon), CODCr (Chemical Oxygen Demand as dichromate method), and BOD5 (Biochemical Oxygen Demand in 5 days). Convinced of the economics and efficiency of the process, a commercial plant with a 400-kW electron accelerator was constructed in 2005. This plant improved the removal efficiency of wastewater by decreasing the retention time in a bio-treatment facility with a dose of approximately 1 kGy. This plant is located in the vicinity of an existing wastewater treatment facility in the DDIC, and the treatment capacity is 10,000 m3 of wastewater per day.

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