Papers by Mikhail Shneider
AIP Advances, Aug 1, 2019
Plasma
Washing fresh produce using Plasma-activated water recently became a promising eco-friendly alter... more Washing fresh produce using Plasma-activated water recently became a promising eco-friendly alternative to using chemical additives such as Chlorine. We discuss the produce-washing experiments that illustrate that addition of plasma to washing water is a multi-faced phenomena. Not only it increases the sterilization ability of water by killing pathogens, but it also has improved washibility: the ability to remove pathogens from the cleaning surface. We propose an explanation of these features based on the recently discoveries that many physical and chemical properties of water change their temperature dependence between about 35 and 60 degrees Celsius. In particular, heat conductance, light absorption, and surface tension all change their temperature dependence. These drastic changes were associated with water gradually changing its mesoscopic structure: while at the higher temperatures water is a uniform media (amorphous state), at the temperatures below transition it consists of m...
This paper considers a simple theoretical model of blocking the passage of signals (action potent... more This paper considers a simple theoretical model of blocking the passage of signals (action potentials) from sensory neurons and thereby effecting anesthesia without the use of anesthetics as a result of a sequence of unipolar current pulses generated by an external source. The proposed model allows the selection of parameters and the required frequency of the repetition of current pulses for the possible implementation of anesthesia depending on the electrical characteristics of the skin and the conductivity of the saline solution in which the myelinated nerve fibers are located.
A theoretical model of electrical synapses is proposed, in which connexons play the role of “nail... more A theoretical model of electrical synapses is proposed, in which connexons play the role of “nails” that hold unmyelinated areas of neurons at a distance of about 3.5 nm, and the electrical connection between them is provided by charging the membrane of an inactive neuron with currents generated in the intercellular electrolyte (saline) by the action potential in the active neuron. This mechanism is similar to the salutatory conduction of the action potential between the nodes of Ranvier in myelinated axons and the ephaptic coupling of sufficiently close spaced neurons.
Journal of Physics D: Applied Physics, 2016
arXiv (Cornell University), Oct 11, 2022
A theoretical model that describes a new mechanism of atomic and molecular ionization in a low in... more A theoretical model that describes a new mechanism of atomic and molecular ionization in a low intensity electromagnetic wave (light or laser beam) with the energy of quanta that is lower than required for a single photon ionization is presented. The essence of the proposed physical mechanism is the step-like gain of energy of a bound electron that occurs every time the phase of the electromagnetic field jolts. Providing there is sufficiently large number of the phase jolts, the summation of the step increases of the electron oscillation energy can render the total energy of the bound electron such that it exceeds the ionization potential.
Journal of Applied Physics, Mar 1, 2008
Вестник Казанского технологического университета, 2013
Physical Review E
The introduction of mid-IR optical parametric chirped pulse amplifiers (OPCPAs) has catalyzed int... more The introduction of mid-IR optical parametric chirped pulse amplifiers (OPCPAs) has catalyzed interest in multi-millijoule, infrared femtosecond pulse-based filamentation. As tunneling ionization is a fundamental first stage in these high-intensity laser-matter interactions, characterizing the process is critical to understand derivative topical studies on femtosecond filamentation and selffocusing. Here, we report first direct nonintrusive measurements of total electron count and electron number densities generated at 3.9 μm femtosecond mid-infrared tunneling ionization of atmospheric air using constructive-elastic microwave scattering. Subsequently, we determine photoionization rates to be in the range of 5.010 8-6.110 9 s-1 for radiation intensities of 1.310 13-1.910 14 W/cm 2 , respectively. The proposed approach paves the wave to precisely tabulate photoionization rates in mid-IR for broad range of intensities and gas types and to study plasma dynamics at mid-IR filamentation.
Plasma Sources Science and Technology
This paper presents the possibility of using coherent microwave scattering (CMS) for temporally r... more This paper presents the possibility of using coherent microwave scattering (CMS) for temporally resolved measurements of the electron momentum-transfer collision frequency in small plasma objects. Specifically, the electron collision frequency is inferred via phase information from microwave scattering off microplasmas operating in the mixed collisional-Thomson scattering regime. We further suggest the combination of phase and amplitude measurements to derive total electron counts and temperatures in small plasmas. An experimental validation of this concept is performed by 10.5 GHz CMS off laser-induced, variable-pressure oxygen and air plasmas.
arXiv (Cornell University), Nov 14, 2017
It is known that gas bubbles on the surface bounding a fluid flow can change the coefficient of f... more It is known that gas bubbles on the surface bounding a fluid flow can change the coefficient of friction and affect the parameters of the boundary layer. In this paper, we propose a method that allows us to create, in the near-wall region, a thin layer of liquid filled with bubbles. It will be shown that if there is an oscillating piezoelectric plate on the surface bounding a liquid, then, under certain conditions, cavitation develops in the boundary layer. The relationship between the parameters of cavitation and the characteristics of the piezoelectric plate oscillations is obtained. Possible applications are discussed.
Scientific Reports, 2021
The total number of electrons in a classical microplasma can be non-intrusively measured through ... more The total number of electrons in a classical microplasma can be non-intrusively measured through elastic in-phase coherent microwave scattering (CMS). Here, we establish a theoretical basis for the CMS diagnostic technique with an emphasis on Thomson and collisional scattering in short, thin unmagnetized plasma media. Experimental validation of the diagnostic is subsequently performed via linearly polarized, variable frequency (10.5–12 GHz) microwave scattering off laser induced 1–760 Torr air-based microplasmas (287.5 nm O2 resonant photoionization by ~ 5 ns, < 3 mJ pulses) with diverse ionization and collisional features. Namely, conducted studies include a verification of short-dipole-like radiation behavior, plasma volume imaging via ICCD photography, and measurements of relative phases, total scattering cross-sections, and total number of electrons $$N_{e}$$ N e in the generated plasma filaments following absolute calibration using a dielectric scattering sample. Findings of...
The absolute number of electrons in a microplasma can be non-intrusively measured through the coh... more The absolute number of electrons in a microplasma can be non-intrusively measured through the coherent elastic scattering of microwave radiation. Here, we establish a theoretical basis for the non-relativistic microwave scattering (MS) diagnostic technique with an emphasis on Thomson and collisional scattering in short, thin plasma media. Experimental validation of the diagnostic is subsequently performed via variable frequency microwave scattering off unmagnetized, laser induced air-based microplasmas with diverse ionization and collisional properties. Namely, through a verification of short-dipole radiation behavior, intensified charge-coupled device (ICCD) imaging, and measurements of total scattering cross sections, number of electrons generated (after calibration), and coherent scattering cross sections. Findings of the paper suggest an ideality of the diagnostic in the Thomson free electron regime – where a detailed knowledge of plasma and collisional properties is unnecessary...
This book comprehensively describes the phenomena that occur in liquid dielectrics under the infl... more This book comprehensively describes the phenomena that occur in liquid dielectrics under the influence of an inhomogeneous pulsed electric field. Written by leading experts in the field, it is the first of its kind to address numerous potential applications such as the technology of high-voltage insulation in pulsed inhomogeneous fields, and applications related to cavitation development in liquid dielectrics, plasma treatment of different materials and plasma medicine dealing with living cells. Liquid Dielectrics in an Inhomogeneous Pulsed Electric Field is intended for a broad audience, from students to engineers and scientists, who are interested in current research questions in electrodynamics and hydrodynamics of liquid dielectrics. Part of the IOP Plasma Physics Series
Bulletin of the American Physical Society, 2018
AIAA Aviation 2019 Forum, 2019
This work proposes a novel method of Thomson microwave scattering for electron number density mea... more This work proposes a novel method of Thomson microwave scattering for electron number density measurements of miniature plasmas at pressures <10 Torr. This method is applied to determine electron number density in a positive column of glow discharge initiated at 5 Torr in air with a plasma column diameter of 3.4 mm. The Thomson Microwave Scattering (TMS) system measured the electron number density to be 3.36•10 10 cm-3. The result obtained using the TMS system was validated against the measurements made using the well-known technique of microwave quarter-wave hairpin resonator. Measurements with the hairpin resonator yielded an electron number density of 2.07•10 10 cm-3 providing adequate agreement with the TMS system. 2 Uout = Total output signal voltage from I/Q mixer νg = collisional frequency ω = frequency of the incident wave ωp = plasma frequency II.
Journal of Applied Physics, 2019
In this work, we present temporally resolved measurements of electron numbers created at photoion... more In this work, we present temporally resolved measurements of electron numbers created at photoionization of various gases by a femtosecond-laser pulse at 800 nm wavelength. The experiments were conducted in O2, Xe, Ar, N2, Kr, and CO at room temperature and atmospheric pressure. Elastic microwave scattering was used to directly measure the electron numbers. Numbers of electrons in the range 3 × 108–3 × 1012 were produced by the laser pulse energies 100–700 μJ. After the laser pulse, plasma decayed on the time scale from 1 to 40 ns depending on the gas type and governed by two competing processes, namely, the creation of new electrons from ionization of the metastable atoms and loss of the electrons due to dissociative recombination and attachment to oxygen.
Optics Communications, 2019
Journal of Propulsion and Power, 2019
Estimates of energy and power requirements for shortening the ignition delay time in hydrocarbon-... more Estimates of energy and power requirements for shortening the ignition delay time in hydrocarbon-fueled scramjet engines using nonequilibrium plasma generation of radicals show that the uniform vol...
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Papers by Mikhail Shneider