Generation of Solution Plasma for Surface Treatment

Solution plasma has been generated in ultrasonic bubbles with new-type electrodes by supplying alternative power. We found solution plasma can be generated in various solvents by applying this technique. Now we try establishing the plasma generation and its application for surface treatmentNagasaki Symposium on Nano-Dynamics 2008 (NSND2008) 平成20年1月29日(火)於長崎大学 Poster Presentatio

Laparoscopic Hepatectomy for the Patient with Hemophilia A with High Titer Factor VIII Inhibitor

We present the first case of laparoscopic left lateral segmentectomy for hepatocellular carcinoma (HCC) in a patient with hemophilia A, acquired hepatitis C, and high-titer factor VIII inhibitor, which was confirmed by preoperative diagnosis. He underwent laparoscopic left lateral segmentectomy with the administration of recombinant activated factor VII. Surgery could be performed with reduced intraoperative hemorrhage. He experienced postoperative intra-abdominal wall hemorrhage, which was successfully managed with red cell concentrates transfusion and administration of recombinant activated factor VII. Laparoscopic hepatectomy can be applied for hemophilia patients with high titer inhibitors

Streamer Branching and Spectroscopic Characteristics of Surface Discharge on Water Under Different Pulsed Voltages

Complexity of branching pattern and OH production of water surface discharges was investigated by comparing nanosecond water surface discharge (NWSD) and microsecond water surface discharges (MWSDs) that were defined as NWSD and MWSD, respectively. Experimental and analyzed results between NWSD and MWSD under comparable maximum discharge length l d are summarized as follows: 1) NWSD showed the greatest complexity of branching pattern by fractal analysis; 2) electron density of NWSD was approximately two times greater than MWSD and both orders were 10 -17 cm -3 ; 3) emission intensity of OH (A-X) from MWSD was greater than NWSD; 4) rotational temperature of NWSD was almost constant around 1000 K irrespective of l d and rotational temperature of MWSD increased with increasing l d ranging from 2000 to 4000 K. It was found that the complexity of discharge pattern on water may be affected by the field intensity at water/air boundary. OH production was presumed to be caused by thermal dissociation in this experimental condition

Thermal Probe Measurements of Energy Flux onto a Substrate in Inductively Coupled Plasmas

ナノダイナミクス国際シンポジウム 平成22年1月21日(木) 於長崎大学Nagasaki Symposium on Nano-Dynamics 2010 (NSND2010), January 21, 2010, Nagasaki University, Nagasaki, Japan, Invited Lectur

Deposition of transparent conducting Al-doped ZnO thin films by ICP-assisted sputtering

Aluminum-doped zinc oxide (AZO) is one of the promising transparent conductive oxide materials, which is expected to be an alternative to tin-doped indium oxide (ITO) that for long has been widely used in industry. The authors have been engaged in the development of AZO deposition process using inductively-coupled plasma assisted sputtering in a couple of years. This paper reports the results showing effectiveness of inductively coupled plasma (ICP) assisted sputtering in AZO film deposition process.2010 IEEE Region 10 Conference (TENCON 2010) : Fukuoka, 2010.11.21-2010.11.2

Shock-wave propagation in supercritical CO2 induced by nanosecond-pulsed arc plasma

Shock waves generated by arc plasma in supercritical (SC) CO2 have the potential to create novel reaction fields. However, there have been few studies of shock-wave characteristics in SC-CO2. This study provides the results of visualization of shock-wave propagation in SC-CO2 generated by nanosecond-pulsed arc plasma. A propagating cylindrical shock wave originating from a discharge channel was observed using time-resolved shadowgraph imaging. The shock wave separated from the cylindrical dark-region induced by pulsed arc plasma within 64 nanoseconds. The Mach numbers of the shock waves were investigated against the medium density of the CO2 ranging from a high-pressure gas phase to the SC phase. The Mach number reached a local maximum at the critical CO2 density level. The anomaly in the Mach number can be explained by the local maximum of the specific heat capacity ratio of the CO2 at close to the critical condition of SC-CO2

Mechanism of particle transport in magnetized silane plasmas

Particle transport phenomena were investigated in silane plasmas in the presence of a magnetic field B perpendicular to a discharge electric field E. From the experimental results, it was concluded that silicon particles were transported in the opposite direction to the E × B drift, and the particle density decreased with increasing applied magnetic flux density. Theoretical calculations on particle drift show that negatively charged particles can be transported in the opposite direction to E × B drift and the drift velocity increases with B for the present experimental conditions. Both experimental and theoretical results suggest that transport by modified ambipolar E × B drift can eliminate particles from discharge space

Dynamics of light-induced anomalous Hall effect in the three-dimensional Dirac semimetal Cd3_3As2_2

We experimentally study the dynamical behavior of the light-induced anomalous Hall effect in a three-dimensional Dirac semimetal, Cd$_3$As$_2$. An ultrashort, circularly polarized, multi-terahertz pump pulse breaks the time-reversal symmetry of a thin film sample. The resulting anomalous Hall effect is clearly observed through the polarization rotation of a single-cycle terahertz probe pulse. Comparing the experimental result with theory, we find that the field-induced injection current dominates the anomalous Hall effect during pump irradiation, while the Berry curvature of the Floquet-Weyl semimetal state does not appreciably contribute. Remarkably, even after pump irradiation, we observe an anomalous Hall effect that lasts for more than 10 ps. A model fit to the Hall conductivity spectrum reveals a relatively long scattering time over 400 fs. This result shows that circularly polarized light creates a polarization of the isospin degree of freedom in the Dirac semimetal, which labels the crystallographic point group representation of the overlapping Weyl semimetal bands. Our observation paves the way for conversion of a robust isospin flow into an electric current at room temperature, being a new analogue of the inverse spin Hall effect.Comment: 44 pages, 14 figure

Plasma Generation in Organic Solvent for Amorphous Carbon Film Deposition inside a Narrow Tube

ナノダイナミクス国際シンポジウム 平成22年1月21日(木) 於長崎大学Nagasaki Symposium on Nano-Dynamics 2010 (NSND2010), January 21, 2010, Nagasaki University, Nagasaki, Japan, Invited Lectur

Investigation of Deposition Process of Amorphous Carbon Film

The dependence of the deposition process of amorphous carbon films on growth temperatures has been investigated by using infrared spectroscopy in multiple internal reflection geometry (MIR-IRAS). The CH_3 peak of amorphous carbon film was decreased as the growth temperature was increased.Nagasaki Symposium on Nano-Dynamics 2008 (NSND2008) 平成20年1月29日(火)於長崎大学 Poster Presentatio