アルゴンプラズマ凝固法(argon plasma coagulation: APC)は外科手術時の臓器切断面止血法のひとつ として用いられてきたが,内視鏡用のアプリケータが 開発されてからは,消化器内視鏡分野で新たな止血 ・凝固法として注目を集めている. APCはアルゴン ガスを噴射し,その流れに高周波電流を重ねた非接 触型高周波凝固法で,アルゴンガスはプローブ先端 でイオン化されアルゴンプラズマ流となって組織に 到達し,表面を凝固する.その適応は止血処置の他, 腫瘍焼灼や食道静脈瘤の地固め療法にも使用され ている.特徴としては,操作が簡便で短時間に広範 囲を浅い深度で凝固できることがあげられる.今回, 重篤な基礎疾患を合併しているため内視鏡的粘膜切除 (Endoscopic mucosal resection: EMR),外科手術が 施行困難な食道表在癌に対しAPC治療を施行した ...

INTRODUCTION The medical use of non-thermal physical plasmas is intensively investigated for sterilization and surface modification of biomedical materials. A further promising application is the removal or etching of organic substances, e.g., biofilms, from surfaces, because remnants of biofilms after conventional cleaning procedures are capable to entertain inflammatory processes in the adjac...

ArDM is a new-generation WIMP detector which will measure simultaneously light and charge from scintillation and ionization of liquid argon. Our goal is to construct, characterize and operate a 1 ton liquid argon underground detector. The project relies on the possibility to extract the electrons produced by ionization from the liquid into the gas phase of the detector, to amplify and read out ...

Although the approach using non-thermal plasma (NTP) for deNOx has been studied for over 15 years, how to achieve higher removal efficiency with lower cost is still a barrier for its industrial application. In order to investigate the impact of the argon additive on electron density, energy and nitric oxide reduction process in plasma, the spectrum of the dielectric barrier discharge at atmosph...

This paper is concerned with numerical studies of the anode region of a high-intensity argon arc. The anode region is divided into three subzones: the anode boundary layer, the presheath and the sheath. The governing equations of the dominating processes with the boundary conditions taken from the solutions of LTE plasmas are solved by applying the Runge±Kutta procedure. One parameter h, i.e., ...

Cold plasma is an innovative and promising technology that developing in a variety of fields, recently it has been getting lot attention the agricultural industry. The influence cold atmospheric pressure (CAPP) exposure on germination parameters vigor radish (Raphanus sativus) carrot (Daucus carota sativus L.) seeds was investigated present study. A custom-designed driver utilizing 11.32 kV rms...

We characterize the parameters of the flowing argon plasma produced by a 16-cmdiameter plasma source utilizing a transverse magnetic filter to reduce electron temperature while maintaining the quasineutrality of the flowing plasma, as a function of the operating parameters of the source: discharge voltage, discharge current, and gas flow rate/neutral background pressure. We evaluate the plasma ...

An experiment of He gas-contact for generating population inversion in a recombining Ar plasma jet is carried out. Population inversion between Ar I excited states 5s′ → 4p′[1/2]1 and 5s′ → 4p[3/2]1,2, [5/2]2,3 is created by helium gas-contact cooling of electrons, whereas it is not created without gas-contact. Ar I lines 1.14 μm, 1.34 μm, and 1.09 μm are strongly enhnced due to the He gas cool...

This study was conducted to determine the effects of argon plasma on the growth of soybean [Glycine max (L.) Merr.] sprouts and investigate the regulation mechanism of energy metabolism. The germination and growth characteristics were modified by argon plasma at different potentials and exposure durations. Upon investigation, plasma treatment at 22.1 kV for 12 s maximized the germination and se...

The so-called hybrid stabilized electric arc utilizes a combination of gas and vortex stabilization. In the hybrid argon-water plasma torch, the arc chamber is divided into the short cathode part, where the arc is stabilized by tangential argon flow, and the longer part, which is stabilized by water vortex. This arrangement provides not only the additional stabilization of the cathode region an...