Kinetic modeling of amplifying characteristics of copper vapor active media for a wide range of input radiation power

2020 ◽  
Vol 460 ◽  
pp. 125136 ◽  
Author(s):  
A.E. Kulagin ◽  
S.N. Torgaev ◽  
G.S. Evtushenko
Keyword(s):  
Kinetic Modeling ◽  
Radiation Power ◽  
Active Media ◽  
Copper Vapor ◽  
Wide Range ◽  
Input Radiation

Kinetic modeling of spatio-temporal evolution of the gain in copper vapor active media

2019 ◽  
Vol 440 ◽  
pp. 146-149 ◽  
Author(s):  
S.N. Torgaev ◽  
A.E. Kulagin ◽  
T.G. Evtushenko ◽  
G.S. Evtushenko
Keyword(s):  
Kinetic Modeling ◽  
Temporal Evolution ◽  
Active Media ◽  
Copper Vapor ◽  
Spatio Temporal

Kinetic modeling and mechanistic investigations of transesterification of propylene carbonate with methanol over an Fe–Mn double metal cyanide catalyst

2020 ◽  
Vol 5 (1) ◽  
pp. 101-111
Author(s):  
Ziwei Song ◽  
Bala Subramaniam ◽  
Raghunath V. Chaudhari
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Propylene Carbonate ◽  
Kinetic Modeling ◽  
Reaction Parameters ◽  
Metal Cyanide ◽  
Wide Range ◽  
Mechanistic Investigations ◽  
Activation Sequence

A kinetic model involving the activation sequence of reactants PC, methanol and an intermediate provides the best description of the experimental data with respect to reaction parameters over a wide range of conditions.

scholarly journals An experimental, theoretical and kinetic-modeling study of the gas-phase oxidation of ammonia

2020 ◽  
Vol 5 (4) ◽  
pp. 696-711 ◽  
Author(s):  
Alessandro Stagni ◽  
Carlo Cavallotti ◽  
Suphaporn Arunthanayothin ◽  
Yu Song ◽  
Olivier Herbinet ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Gas Phase ◽  
Theoretical Investigation ◽  
Kinetic Modeling ◽  
Ammonia Gas ◽  
Wide Range ◽  
Phase Oxidation ◽  
Detailed Kinetic Model ◽  
Gas Phase Oxidation ◽  
Modeling Study

A wide-range experimental and theoretical investigation of ammonia gas-phase oxidation is performed, and a predictive, detailed kinetic model is developed.

Wide-range calibration of optical radiation power meters

2019 ◽  
Vol 86 (12) ◽  
pp. 758
Author(s):  
E. V. Kuvaldin ◽  
A. A. Shulga
Keyword(s):  
Optical Radiation ◽  
Radiation Power ◽  
Wide Range

scholarly journals Possibilities of precision material micro-processing by laser pulse copper-vapor radiation

2017 ◽  
Vol 2 (2) ◽  
pp. 36-48
Author(s):  
Мишик Казарян ◽  
Mishik Kazaryan ◽  
Николай Лябин ◽  
Nikolay Lyabin ◽  
Александр Григорьянц ◽  
...  
Keyword(s):  
Radiation Power ◽  
Sheet Material ◽  
Thin Sheet ◽  
Visible Spectrum ◽  
Copper Vapor ◽  
Micro Cracks ◽  
Thin Sheet Material ◽  
Spectrum Region ◽  
Experimental Researches

The paper reports the results of experimental researches on microprocessing by laser copper-vapor radiation with wave-lengths of radiation in the visible spectrum region of 510.6 and 578.2 nm and the frequency of pulse repetition of 14-15kHz, a nano-second duration of pulses and a peak power density of 109-1011 W/cm2 in the focused spot light with the diameter of 10…20µkm. The investigations carried out became a basis for the creation of modern automated laser technological plants “Caravelle-2” and “Caravelle-2M” and with the average radiation power of 6-8W, an operation field of horizontal XY- table 100x100 and 200x200mm and positioning accuracy on axes ±2µkm for the precision micro-machining of foil materials – 0.01-0.2mm; “Caravelle-1” and “Caravelle-1M” with the radiation power of 10-15 20-25 W, an operation field of XY-table 150x150mm for the thin-sheet material micro-processing – 0.3-0.5mm and 0.6-1mm. The productivity of the plants mentioned as compared with common methods including also EEM is by an order and more higher. Material micro-processing with laser nano-second copper-vapor radiation ensures a higher quality of a cut: minor roughness of a cut surface (≥1…3µkm) and the area of thermal impact (≤3…5µkm) and stratifications and micro-cracks do not appear in such heat-resistant material as molybdenum and tungsten.

scholarly journals Treatment of palpebral melanocytic nevi with a dual-wavelengths copper vapor laser

2020 ◽  
Vol 96 (5) ◽  
pp. 47-52
Author(s):  
I. V. Ponomarev ◽  
Yu. N. Andrusenko ◽  
Sergey Topchiy ◽  
Ludmila Shakina
Keyword(s):  
Radiation Power ◽  
Dual Wavelength ◽  
Copper Vapor Laser ◽  
Vapor Laser ◽  
Melanocytic Nevi ◽  
Copper Vapor ◽  
Surgical Methods ◽  
Wavelength Radiation ◽  
Skin Healing ◽  
Frequent Reason

Acquired melanocytic nevi in aesthetically significant areas, especially palpebral nevi (PN), are becoming a frequent reason for patients to seek dermatologists. Surgical methods for removal of PN are reported to be associated with the risk of such side effects as scars and loss of eyelashes. Aim of the study. To evaluate the efficacy of the removal of PN on the eyelid area with dual-wavelength radiation of a copper vapor laser (CVL). Patients and methods. Laser removal of medium and large-sized PN (up to 10 mm) was performed in three fair-skin female patients. The procedures were carried out at an average CVL radiation power of 0.60.8 W, at a 3:2 ratio of radiation powers at wavelengths of 511 nm and 578 nm, exposure duration 0.3 s, light spot diameter 1 mm. The treatment was carried out during one session. Results. Removal of PN with dual-wavelength CVL radiation allowed achieving a significant lightening and reduction of the involved area, without scars. The skin healing after the procedure lasted 2 weeks. Conclusion. The high efficacy of the PN removing in the eyelid area using the dual-wavelength CVL radiation allows the introduction of this approach into dermatologists and cosmetologists clinical practice.

Description and Characterization of a 114-kWe High-Flux Solar Simulator

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Shunzhou Chu ◽  
Fengwu Bai ◽  
Fuliang Nie ◽  
Zhifeng Wang
Keyword(s):  
Conversion Efficiency ◽  
Focal Plane ◽  
Radiation Power ◽  
Thermal Power ◽  
Mapping Method ◽  
Stagnation Temperature ◽  
High Flux ◽  
Power Module ◽  
Solar Simulator ◽  
Wide Range

Abstract A high-flux solar simulator is essential for evaluating solar thermal components under controlled and adjustable flux input conditions. This study presents a newly built high-flux solar simulator composed of 19 individual units. Each unit includes a xenon short-arc lamp (each consuming up to 6 kW electricity power) coupled with a truncated ellipsoidal reflector, a cooling blower, and a power module. The power module yields a current in the range of 50–160 A. The number of lamps in use is flexible, which allows for a wide range of radiation flux (10%–100%) on the focal plane. The radiation power, peak value, flux distribution on the circular target plane, and conversion efficiency are evaluated based on a flux mapping method. The results indicate that the proposed solar simulator is capable of achieving thermal power of 23.3 kW, peak flux in excess of 1.78 MW/m2, a stagnation temperature exceeding 2360 °C, and average irradiance of 773.4 kW/m2 on the focal plane (diameter of 260 mm). The electro-thermal conversion efficiency of the simulator is 35.7%. A ray-tracing method was employed, and the simulation results were found to be in good agreement with those in the experiments. An experimental test of a volumetric ceramic receiver was conducted, and the results indicate the availability and applicability of the high-flux solar simulator when carrying out studies about solar receivers.

scholarly journals Depth-of-Field-Extended Plenoptic Camera Based on Tunable Multi-Focus Liquid-Crystal Microlens Array

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4142 ◽  
Author(s):  
Mingce Chen ◽  
Wenda He ◽  
Dong Wei ◽  
Chai Hu ◽  
Jiashuo Shi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Radiation Power ◽  
Focal Length ◽  
Microlens Array ◽  
Oxide Semiconductor ◽  
Depth Of Field ◽  
Digital Refocusing ◽  
Wide Range ◽  
Cmos Sensor ◽  
Plenoptic Camera

Plenoptic cameras have received a wide range of research interest because it can record the 4D plenoptic function or radiance including the radiation power and ray direction. One of its important applications is digital refocusing, which can obtain 2D images focused at different depths. To achieve digital refocusing in a wide range, a large depth of field (DOF) is needed, but there are fundamental optical limitations to this. In this paper, we proposed a plenoptic camera with an extended DOF by integrating a main lens, a tunable multi-focus liquid-crystal microlens array (TMF-LCMLA), and a complementary metal oxide semiconductor (CMOS) sensor together. The TMF-LCMLA was fabricated by traditional photolithography and standard microelectronic techniques, and its optical characteristics including interference patterns, focal lengths, and point spread functions (PSFs) were experimentally analyzed. Experiments demonstrated that the proposed plenoptic camera has a wider range of digital refocusing compared to the plenoptic camera based on a conventional liquid-crystal microlens array (LCMLA) with only one corresponding focal length at a certain voltage, which is equivalent to the extension of DOF. In addition, it also has a 2D/3D switchable function, which is not available with conventional plenoptic cameras.

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