Plasma technology has arisen as a novel approach in the processing and manufacturing of novel materials in recent years. Due to its benefits, such as its superior sterilizing performance, low cost, ...and environmental friendliness, atmospheric pressure plasma has drawn the attention of researchers. As a result, atmospheric pressure plasma manufacturing in different configurations (plan parallel and jet plasma) is becoming more popular. The necessity to characterize these types of plasmas has greatly expanded as a result of its wide range of applications. Due to these factors, “Recent Advances in Atmospheric-Pressure Plasma Technology” Issue in the journal Applied Physics that brings together experts in all areas of experimental, computational, and theoretical research on atmospheric pressure plasmas. This Special Issue brings together cutting-edge new research on the fundamental characteristics of these plasmas as well as their applications in the fields of medicine, the food industry, agriculture, 3D printing, materials processing science, and even the automotive and aerospace industries. Despite the fact that we were only able to touch on a small percentage of the potential applications for plasma discharge, we nevertheless hope that readers will find this reprint to be interesting and that they will discover new angles for their own future research on plasma.
Physical characteristics of plasma antennas Rayner, J.P.; Whichello, A.P.; Cheetham, A.D.
IEEE transactions on plasma science,
02/2004, Letnik:
32, Številka:
1
Journal Article
Recenzirano
This experimental and theoretical study examines the excitation of a plasma antenna using an argon surface wave discharge operating at 500 MHz with RF power levels up to 120 W and gas pressures ...between 0.03 and 0.5 mb. The results show that the length of the plasma column increases as the square root of the applied power and that the plasma density decreases linearly from the wave launcher to the end of the plasma column. These results are consistent with a simple global model of the antenna. Since noise is critical to communication systems, the noise generated by the plasma was measured from 10 to 250 MHz. Between 50 and 250 MHz the excess noise temperature was found to be 17.2/spl plusmn/1.0 dB above 290 K. This corresponds to an ohmic thermal noise source at 1.4/spl plusmn/0.3 eV, compared with an electron temperature of 1.65 eV predicted by the global model. Estimates of the electrical conductivity of the plasma column based on measured electron number densities lead to an antenna efficiency of about 65% at a transmission frequency of 100 MHz and an increase in total antenna noise of 1 dB due to the plasma. Theoretical modeling and experimental observations of the radiation pattern of the antenna show that the linear variation of conductivity and finite resistance of the column lead to a reduction in the depth of the nulls in the radiation pattern and a consequent increase in the width of the main lobe.
This rigorous explanation of plasmas is relevant to diverse plasma applications such as controlled fusion, astrophysical plasmas, solar physics, magnetospheric plasmas, and plasma thrusters. More ...thorough than previous texts, it exploits new powerful mathematical techniques to develop deeper insights into plasma behavior. After developing the basic plasma equations from first principles, the book explores single particle motion with particular attention to adiabatic invariance. The author then examines types of plasma waves and the issue of Landau damping. Magnetohydrodynamic equilibrium and stability are tackled with emphasis on the topological concepts of magnetic helicity and self-organization. Advanced topics follow, including magnetic reconnection, nonlinear waves, and the Fokker–Planck treatment of collisions. The book concludes by discussing unconventional plasmas such as non-neutral and dusty plasmas. Written for beginning graduate students and advanced undergraduates, this text emphasizes the fundamental principles that apply across many different contexts.
A nonthermal plasma torch has been developed to study the targeted killing of melanoma cells. In this paper, 1205Lu melanoma cells and keratinocytes were exposed to the plasma. These cells were ...transfected with green fluorescent protein in order to establish a system for coculture with primary keratinocytes. Results show that a 10 s treatment with plasma causes a morphological change in the melanoma cells, as observed after 18 h. However, after only 15 min following plasma treatment, a significant killing of melanoma cells was observed, with a much reduced killing of keratinocytes. Nonthermal plasma may serve as an effective tool for future therapeutic cancer treatment.
A compact high-power-density helicon plasma source operating on abundant medium atomic weight gases is under examination for a potential electric propulsion application. A high specific impulse, ...which is easily varied in the range of ~1-2 ks for Ar and ~2-4 ks for N 2 propellant, was achieved. A well- collimated plasma plume with emittance ~10deg is produced in a single-magnet configuration. Analysis of the data obtained using in situ and noninvasive spectral diagnostics indicates almost complete gaseous propellant ionization and thrust efficiency eta T ~ 20% with the lowest net ionization cost of ~(80 V) -1 per ion. Direct weighing has yielded a thrusting force of T ~ 10 mN.
Bewährtes und Innovatives Probst, Astrid
Procare: Das Forbildungsmagazin Fur Pflegeberufe,
12/2022, Letnik:
27, Številka:
10
Journal Article
Recenzirano
ABCDE-REGEL FÜR STRUKTURIERTE DIAGNOSTIK DER URSACHEN A Anamnese (Anamnesis) B Bakterien (Bacteria) C Klinische Untersuchung (Clinical examination D Durchblutung (Defective vascular system) E Extras ...(Extras) aus Dissemond und KrÖger, 2020, S. 65 Im Rahmen der Therapiebesprechung kann man die entsprechende Wundversorgungsart für den Patienten auswählen. Die Studienlage für Sauerstofftherapie und Wundheilung wurde in einem Positionsdokument der EWMA (European Wound Management Association) im Jahr 2017 beschrieben. “ Behandlung mit kaltem Plasma (cold atmospheric plasma — CAP): Eine neue innovative Therapie ist die lokale Behandlung mit kaltem Plasma.
In this paper, the nonlinear interaction between kinetic instabilities driven by multiple ion beams and magnetized electrons is investigated. Electron diffusion across magnetic field lines is ...enhanced by the coupling of plasma instabilities. A two-dimensional collisionless particle-in-cell simulation is performed accounting for singly and doubly charged ions in a cross-field configuration. Consistent with prior linear kinetic theory analysis and observations from coherent Thomson scattering experiments, the present simulations identify an ion-ion two-stream instability due to multiply charged ions (flowing in the direction parallel to the applied electric field) which coexists with the electron cyclotron drift instability (propagating perpendicular to the applied electric field and parallel to the E×B drift). Small-scale fluctuations due to the coupling of these naturally driven kinetic modes are found to be a mechanism that can enhance cross-field electron transport and contribute to the broadening of the ion velocity distribution functions
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