Selection of kinetic energy of laser ablated particles

1996 ◽  
pp. 659-662
Author(s):  
Kanji Kuba ◽  
Tadashi Sugihara
Keyword(s):  
Kinetic Energy ◽  
Selection Of

Study on Heating Process of Dehumidifying Experiment in HTGR

2020 ◽  
Author(s):  
Kaiyue Shen ◽  
Wei Zheng ◽  
Shengchao Ma ◽  
Huaqiang Yin ◽  
Xuedong He ◽  
...  
Keyword(s):  
High Temperature ◽  
Kinetic Energy ◽  
Thermal Energy ◽  
Reactor Core ◽  
Primary Circuit ◽  
Heating Process ◽  
Transfer Model ◽  
Thermal Source ◽  
Flow And Heat Transfer ◽  
Selection Of

Abstract A large number of carbon materials are used in high temperature gas-cooled reactor (HTGR). As a kind of porous material, the carbon material contains a certain amount of moisture and other impurities. In order to reduce the corrosion of internal material in reactor core of HTGR, the initial core or post-accident core must be strictly heated and dehumidified. The current primary circuit heating mainly relies on the rotation of the primary pump to convert the kinetic energy into thermal energy. Obviously, the current scheme was flawed: (1) Due to the insufficient heat generated by rotation of the primary pump, the temperature rising process of the primary circuit is sluggish; (2) The rotation of the primary pump converts the kinetic energy into thermal energy of the helium, at the meantime, the primary circuit dissipates heat outward. For the above reasons, it is difficult to achieve the desired dehumidification temperature in the heating process. While in this paper, an additional thermal source will be added to the steam generator to heat the primary circuit in a new scheme. A proper flow and heat-transfer model of heating the primary circuit in high-temperature reactor was established based on software COMSOL Multiphysics. The numerical analysis of the primary circuit heating process provides rewarding guidance for the selection of the dehumidification scheme in HTGR.

Angle-dependence of ion kinetic energy spectra obtained by using mass spectrometers II. Experimental considerations and preliminary results on non-fragmenting systems

1984 ◽  
Vol 392 (1802) ◽  
pp. 89-106 ◽  
Keyword(s):  
Kinetic Energy ◽  
Energy Analysis ◽  
Energy Spectra ◽  
Observation Angle ◽  
Initial Angle ◽  
Mass Spectrometers ◽  
Small Uncertainty ◽  
Ion Kinetic Energy ◽  
Double Focusing ◽  
Selection Of

Experimental problems associated with studies of the scattering of kilovolt projectile ions in mass spectrometers designed primarily for chemical analysis are discussed. The parameters that are important in satisfactorily controlling and defining the actual scattering angle in relation to the observation angle are considered in detail. Two different experimental configurations are considered; angular selection before, or after kinetic energy analysis of the collision products. A modification to a VG ZAB-2F double-focusing mass spectrometer, in order to observe angle-resolved ion kinetic energy spectra of collisionally scattered ion beams, is described. Initial angle-resolved experiments on systems that do not involve fragmentation, have been performed. The results are presented for the angle-resolved energy loss spectra of Ar + and N 2 + and the angle-resolved charge-stripping of Ar + . A feature of the apparatus described is the small uncertainty in the angular selection of the analysing angle-resolved slit.

An Iceberg Collision Reliability Model Incorporating Hydrodynamic Effects

1990 ◽  
Vol 112 (4) ◽  
pp. 364-369
Author(s):  
M. Isaacson ◽  
K. A. McTaggart
Keyword(s):  
Kinetic Energy ◽  
Energy Levels ◽  
Added Mass ◽  
Wave Climate ◽  
Climate Data ◽  
Offshore Structure ◽  
Reliability Method ◽  
Wave Induced ◽  
Hydrodynamic Effects ◽  
Selection Of

A probabilistic model is developed for the selection of a design iceberg collision event with a fixed offshore structure. The model has been formulated such that input parameters can be obtained from available iceberg surveillance and wave climate data. Once input data for a given site are obtained, probabilities of exceedance for various kinetic energy levels are estimated using a second-order reliability method. A key feature of the model is its incorporation of wave-induced motions and added mass in the evaluate of iceberg kinetic energy.

SELECTION OF COINCIDENCE ELECTRON-PROTON EVENTS IN NUCLEI INTERACTION

2019 ◽  
Vol 53 (1 (248)) ◽  
pp. 53-59
Author(s):  
D.A. Martiryan
Keyword(s):  
Electron Beam ◽  
Energy Transfer ◽  
Kinetic Energy ◽  
Energy Distribution ◽  
Momentum Distribution ◽  
Virtual Photon ◽  
Kinetic Energy Distribution ◽  
Coordinate Frame ◽  
Using Data ◽  
Selection Of

The main goal of this analysis is to study momentum (or kinetic energy) distribution of the backward going protons using data from CLAS EG2 experiment at Jefferson Lab. In this experiment scattering of a 5.014 GeV electron beam off various nucleus targets, ranging from deuterium to lead, have been recorded. The analysis includes selection of events in the reaction $ A(e, e^{\prime}, P_{back}) X $, where $ P_{back} $ is a proton scattered above 90° either in the lab coordinate frame or with respect to the direction of the interacting virtual photon, then performing required corrections and studying the protons momentum distribution as a function of energy transfer. In this paper identification of electron-proton events is presented.

scholarly journals Development of a footstep power generator in converting kinetic energy to electricity

2019 ◽  
Vol 80 ◽  
pp. 02001 ◽  
Author(s):  
Chun Kit Ang ◽  
Ammar A. Al-Talib ◽  
Sook Meng Tai ◽  
Wei Hong Lim
Keyword(s):  
Kinetic Energy ◽  
Energy Conversion ◽  
Low Cost ◽  
Renewable Energies ◽  
Power Generator ◽  
Hind Foot ◽  
Theoretical Results ◽  
Selection Of

Kinetic energy is considered as one of the renewable energies. Substantial amounts of researches were conducted to investigate the feasibility of converting the kinetic energy into electricity. Nevertheless, most of these previous works emphasized on the selection of suitable materials and the design of power generator which tends to be complicated. In this paper, a simple and yet low cost mechanism has been proposed to enhance the performance and efficiency of energy conversion from kinetic energy to electricity energy by placing a mechanical footstep power generator on the hind foot region. A total of 45 individuals were invited to participate in the experiments and the experiment results are then compared with the theoretical results.

BOSE-EINSTEIN CORRELATIONS OF POSITIVE PIONS IN COLLISIONS OF Nb+Nb AND Au+Au AT 650 A MeV

1988 ◽  
Vol 03 (18) ◽  
pp. 1745-1752 ◽  
Author(s):  
R. BOCK ◽  
G. CLAESSON ◽  
K.G.R. DOSS ◽  
H.-Å. GUSTAFSSON ◽  
H.H. GUTBROD ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Center Of Mass ◽  
Mass System ◽  
Pion Interferometry ◽  
Plastic Ball ◽  
Significant Change ◽  
Bose Einstein ◽  
Selection Of

Two-pion interferometry analysis of the Plastic Ball data for Au+Au and Nb+Nb interactions at 650 A MeV kinetic energy is presented. The values of 3.4±0.4 fm and 4.8±0.6 fm for pion source sizes and 3.6±0.8 fm /c and 5.7±0.7 fm /c for lifetimes are obtained for the Nb+Nb and Au+Au cases, respectively. No significant change in radius as a function of multiplicity has been observed. However, the selection of π+ with low momenta in the center of mass system reveals an enlarged radius for the Au+Au system but no such increase for Nb+Nb .

An Energy-Constrained Parameterization of Eddy Buoyancy Flux

2008 ◽  
Vol 38 (8) ◽  
pp. 1807-1819 ◽  
Author(s):  
Paola Cessi
Keyword(s):  
Energy Balance ◽  
Kinetic Energy ◽  
Large Scale ◽  
Coarse Grid ◽  
Horizontal Gradient ◽  
Mixing Length ◽  
Velocity Scale ◽  
Energy Constrained ◽  
Horizontal Flux ◽  
Selection Of

Abstract A parameterization for eddy buoyancy fluxes for use in coarse-grid models is developed and tested against eddy-resolving simulations. The development is based on the assumption that the eddies are adiabatic (except near the surface) and the observation that the flux of buoyancy is affected by barotropic, depth-independent eddies. Like the previous parameterizations of Gent and McWilliams (GM) and Visbeck et al. (VMHS), the horizontal flux of a tracer is proportional to the local large-scale horizontal gradient of the tracer through a transfer coefficient assumed to be given by the product of a typical eddy velocity scale and a typical mixing length. The proposed parameterization differs from GM and VMHS in the selection of the eddy velocity scale, which is based on the kinetic energy balance of baroclinic eddies. The three parameterizations are compared to eddy-resolving computations in a variety of forcing configurations and for several sets of parameters. The VMHS and the energy balance parameterizations perform best in the tests considered here.

scholarly journals Hydraulic regimes and hydrostatic pressure of the flow on the elements of fastenings of the downstream of water outlets

2021 ◽  
Vol 264 ◽  
pp. 03053
Author(s):  
Sanatjon Khidirov ◽  
Zokhidjon Ishankulov ◽  
Jakhongir Kosimov ◽  
Durdona Tadjieva ◽  
Panji Nurmatov ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Kinetic Energy ◽  
Water Intake ◽  
Water Injection ◽  
Hydraulic Structures ◽  
Structural Elements ◽  
Complex Processes ◽  
Hydropower Plants ◽  
Selection Of ◽  
Comprehensive Study

A comprehensive study of the flow of water plays an important role in the design of the area of the lower reaches of the drainage and drainage structures of hydraulic structures. In particular, the complex processes associated with the flow movement in the lower reaches of low and medium pressure reservoirs play an important role in the selection of the appearance of the structure, structural elements and their shapes, sizes and location conditions. One of the important issues is to assess the strength of the elements of the lower basins of water intake facilities and hydropower plants in the current reservoirs, to determine the mode of connection of the basins, to improve the methods of quenching kinetic energy in the reinforced areas of the lower basin. Based on the 2 schemes adopted in this article, the hydrostatic pressures of several types of power extinguishers installed in the area of the water injection well, providing the bottom pound strength, were determined for the experimental device.

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