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Exploring fs-laser irradiation damage subthreshold behavior of dielectric mirrors via electrical measurements

High Power Laser Science and Engineering 2024年第2期12卷 24-32页

作者： Petrisor Gabriel Bleotu Radu Udrea Alice Dumitru Olivier Uteza Maria-Diana Mihai Dan gh Matei Daniel Ursescu Stefan Irimiciuc Valentin Craciun Extreme Light Infrastructure-Nuclear Physics(ELI-NP) Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering(IFIN-HH)MagureleRomania Doctoral School of Physics University of BucharestMagureleRomania LULI-CNRS CEAUniversite SorbonneEcole PolytechniqueInstitut Polytechnique de ParisPalaiseau CEDEXFrance Apel Laser IlfovRomania Aix-Marseille University CNRSLP3 UMR 7341MarseilleFrance Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering(IFIN-HH) MagureleRomania University Politehnica of Bucharest BucharestRomania National Institute for Lasers Plasma and Radiation Physics MagureleRomania

With ultrafast laser systems reaching presently 10 PW peak power or operating at high repetition rates,research towards ensuring the long-term,trouble-free performance of all laser-exposed optical components is *** work is focused on providing insight into the optical material behavior at fluences below the standardized laser-induced damage threshold(LIDT)value by implementing a simultaneous dual analysis of surface emitted particles using a Langmuir probe(LP)and the target current(TC).HfO_(2) and ZrO_(2) thin films deposited on fused silica substrates by pulsed laser deposition at various O_(2) pressures for defect and stoichiometry control were irradiated by Gaussian,ultrashort laser pulses(800 nm,10 Hz,70 fs)in a wide range of *** TC and LP collected signals were in good agreement with the existing theoretical description of laser–matter interaction at an ultrashort time *** approach for an in situ LIDT monitoring system provides measurable signals for below-threshold irradiation conditions that indicate the endurance limit of the optical surfaces in the single-shot energy scanning *** LIDT value extracted from the LP-TC system is in line with the multipulse statistical analysis done with ISO 21254-2:2011(E).The implementation of the LP and TC as on-shot diagnostic tools for optical components will have a significant impact on the reliability of next-generation ultrafast and high-power laser systems.

关键词： HfO_(2) in situ detection Langmuir probe laser-induced damage threshold target current ZrO_(2)

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Hard life for sons in the nest?Sex-dependent offspring mortality in Great Tits in urban and forest areas

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Avian Research 2024年第1期15卷 91-97页

作者： Nora Agh Henriett Anna Dalvári Krisztián Szabó Ivett Pipoly András Liker HUN-REN-PE Evolutionary Ecology Research Group University of PannoniaH-8200VeszpremPf.1158.Hungary Behavioral Ecology Research Group Center for Natural SciencesUniversity of PannoniaH-8200Pf.1158.VeszpremHungary Molecular Ecology Research Group Department of EcologyUniversity of Veterinary Medicine BudapestH-1400Pf.2.BudapestHungary Synlab Hungary Ltd. H-1211Weiss Manfr´ed Str.5-7BudapestHungary

Sex-biased mortality can occur in birds during development,for example due to sexual differences in energy requirement and/or environmental sensitivity,or the effects of sex hormones or sex differences in the expression of mutations linked to sex *** extent of sex-bias in mortality may also be related to environmental conditions that influence offspring development and *** areas often provide poorer conditions for nestling development resulting in higher offspring mortality compared to natural areas,which may accelerate sex differences in offspring mortality in *** test this hypothesis,we examined the sex ratio of dead offspring in Great Tits(Parus major),using 427 samples of unhatched eggs and dead nestlings collected in two urban and two forest sites between 2013 and *** ratio of males in the whole sample of dead offspring(56.9%)was significantly higher than expected by an 1:1 ratio,and the strongest sex biases were detected in urban areas(57.6%males)and in young nestlings(ghlight the need of large datasets to detect subtle differences between habitats and developmental stages.

关键词： Great Tit Urbanization Nestling mortality Sex related differences

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Structures and Properties of LiF Cluster-assembled Nanofilms

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Journal of Materials Science & Technology 1997年第4期13卷 274-279页

作者： Wang, gh Liu, FQ CTR ADV STUDIES & TECHNOL MICROSTRUCT NANJING 210093PEOPLES R CHINA

We have studied structures and properties of nanostructured films prepared with nanometer-sized lithium fluoride (Lif) clusters by inert gas condensation method, and then characterized by transmission electron microscope, Fourier transform infrared spectra and Raman scattering spectra, etc. Following important results are obtained: Multi-order-like Raman scatterings from LiF clusters are obtained, including the fine structure of the spectra. The observed Raman peaks are discussed in terms of surface optical modes, LO, TO, LA modes and their combination form. As the cluster size decreases, the phonons are confined in nanoscale so that the q vector selection rule is relaxed or even totally free of q conservation, and prohibition at the first- and third-order scatterings in the bulk LiF crystal is relaxed. The surface modes appear and play an important role in Raman scattering processes. The infrared absorption spectra are obtained with different deposition conditions. When the clusters are in the medium size range from similar to 7 to 15 nm, most infrared absorption peaks are second-order feature, and no single surface mode emerges. For the smaller clusters, molecular-like vibration is observed whereas the broad band of long wavelength transverse-optical modes appear from 580 to 400 nm(-1) for the clusters larger than 19 nm.

关键词： Nanostructured materials

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Analytical Study of Moving Excitations for One-dimensional Homogeneous Lattice with Quartic Anharmonicity

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Journal of Materials Science & Technology 1999年第4期15卷 345-347页

作者： Zhou, gh Yan, JR Hunan Normal Univ Dept Phys Changsha 410081 Peoples R China Hunan Normal Univ Inst Nonlinear Sci Changsha 410081 Peoples R China Chinese Acad Sci Int Ctr Mat Phys Shenyang 110015 Peoples R China

The moving nonlinear excitations (intrinsic localized vibrational modes) for one-dimensional homogeneous monoatomic lattice with quartic anharmonicity are obtained analytically by means of the semidiscrete approximation, with which the carrier wave is treated explicitly while the envelope function is described in the continuum approximation. Besides the moving pulse-like type of excitations which was found previously in both analytical and numerical works, we find that the moving kink-like type of excitations can also exist. And the kink-like excitations appeared previously only in the stationary form for such a lattice system.

关键词： Crystalline materials

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NUMERICAL ANALYSIS FOR A MEAN-FIELD EQUATION FOR THE ISING MODEL WITH GLAUBER DYNAMICS

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Journal of Computational Mathematics 1997年第3期15卷 203-218页

作者： Lu, BN Wan, gh SHAANXI NORMAL UNIV DEPT MATHXIANPEOPLES R CHINA

In this paper, a mean-field equation of motion which is derived by Penrose (1991) for the dynamic Ising model with Glauber dynamics is considered. Various finite difference schemes such as explicit Euler scheme, predictor-corrector scheme and some implicit schemes are given and their convergence, stabilities and dynamical properties are discussed. Moreover, a Lyapunov functional for the discrete semigroup {S}(n>0) is constructed. Finally, numerical examples are computed and analyzed. it shows that the model is a better approximation to Cahn-Allen equation which is mentioned in Penrose (1991).

关键词： Figure NUMERICAL ANALYSIS FOR A MEAN-FIELD EQUATION FOR THE ISING MODEL WITH GLAUBER DYNAMICS Math

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An optimal energy management development for various configuration of plug-in and hybrid electric vehicle

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Journal of Central South University 2015年第5期22卷 1737-1747页

作者： Morteza Montazeri-gh Mehdi Mahmoodi-K Systems Simulation and Control Laboratory School of Mechanical EngineeringIran University of Science and Technology Tehran P.O.Box 16846-13114 Iran

Due to soaring fuel prices and environmental concerns, hybrid electric vehicle(HEV) technology attracts more attentions in last decade. Energy management system, configuration of HEV and traffic conditions are the main factors which affect HEV's fuel consumption, emission and performance. Therefore, optimal management of the energy components is a key element for the success of a HEV. An optimal energy management system is developed for HEV based on genetic algorithm. Then, different powertrain system component combinations effects are investigated in various driving cycles. HEV simulation results are compared for default rule-based, fuzzy and GA-fuzzy controllers by using ADVISOR. The results indicate the effectiveness of proposed optimal controller over real world driving cycles. Also, an optimal powertrain configuration to improve fuel consumption and emission efficiency is proposed for each driving condition. Finally, the effects of batteries in initial state of charge and hybridization factor are investigated on HEV performance to evaluate fuel consumption and emissions. Fuel consumption average reduction of about 14% is obtained for optimal configuration data in contrast to default configuration. Also results indicate that proposed controller has reduced emission of about 10% in various traffic conditions.

关键词： plug-in and hybrid electric vehicle energy management configuration genetic fuzzy controller fuel consumption emission

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Effects of γ-irradiation and Deformation Temperature on Tensile Properties of Pb-2 mass% Sb Alloy

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Journal of Iron and Steel Research International 2016年第7期23卷 733-738页

作者： gh MOHAMMED S.EI-GAMAL Physics Department Faculty of ScienceNorthern Borders University Physics Department Faculty of EducationAin Shams University

Effects ofγ-irradiation and deformation temperature（T）on the tensile properties of Pb-2mass% Sb alloys were *** samples were annealed at 458 Kfor 2hin air,then water quenched after they wereγ-irradiated（the different doses were 0.5,1.0,1.5,and 2.0 MGy）.The tensile properties were performed using stress-strain measurements at a constant strain rate（1.2×10^（-3） s^（-1））and at different T（303-393K）.It was found that at constant dose,the fracture stress（σF）decreases while the fracture strain（εF）increases as *** particular T,σFincreases whileεFdecreases with increasing *** strain-hardening exponent（n）,which is the slope of the relation between ln（σ）and ln（ε）of the parabolic part of the stress-strain curve,was determined and its values increase as Tincreases and decrease as the dose *** value of the activation energy increases as the dose increases from 0.07 eV for un-irradiated sample to 0.1eV for the 2 MGy-irradiated *** values are in accordance with that needed for dislocation movement and ordering *** interpretation of the results was given,based on the creation of point and line defects due toγ-irradiation,and that results in a distribution of beta phase（Sb-phase）,leading to a difficulty in the movement of dislocations,so there is an increase in alloy hardness.

关键词： γ-irradiation deformation temperature tensile property Pb-2 mass% Sb alloy

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THE GLOBAL DUFORT-FRANKEL DIFFERENCE APPROXIMATION FOR NONLINEAR REACTION-DIFFUSION EQUATIONS

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Journal of Computational Mathematics 1998年第3期16卷 275-288页

作者： Lu, BN Wan, gh Guo, BL Xiangtan Univ Inst Computat & Appl Math Xiangtan 411105 Peoples R China Inst Appl Phys & Computat Math Lab Computat Phys Beijing 100088 Peoples R China Shaanzi Normal Univ Dept Math Xian 710062 Peoples R China Inst Appl Phys & Computat Math Ctr Nonlinear Studies Beijing 100088 Peoples R China

In this paper, the initial value problem of nonlinear reaction-diffusion equation is considered. The Dufort-Frankel finite difference approximation for the long time scheme is given for the d-dimensional reaction-diffusion equation with the two different cases. The global solution and global attractor are discussed for the Dufort-Frankel scheme. Moreover properties of the solution are studied. The error estimate is presented in a finite time region and in the global time region for some special cases. Finally the numerical results for the equation are investigated for Allen-Cahn equation and some other equations and the homoclinic orbit is simulated numerically.

关键词： global Dufort-Frankel method reaction-diffusion equation global attractor error estimate numerical experiments

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RHEOLOGICAL PROPERTIES OF METAL INVECTION MOLDING BINDER AND FEEDSTOCK

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中国有色金属学会会刊：英文版 1997年第3期7卷 104-108页

作者： Li, YM Qu, XH Huang, BY Qiu, gh CENT S UNIV TECHNOL NATL KEY LAB POWDER METCHANGSHA 410083PEOPLES R CHINA

ＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＭＥＴＡＬＩＮＶＥＣＴＩＯＮＭＯＬＤＩＮＧＢＩＮＤＥＲＡＮＤＦＥＥＤＳＴＯＣＫ①ＬｉＹｉｍｉｎ，ＱｕＸｕａｎｈｕｉ，ＨｕａｎｇＢａｉｙｕｎ，ＱｉｕＧｕａｎｇｈａｎＮａｔｉ... 详细信息

ＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＭＥＴＡＬＩＮＶＥＣＴＩＯＮＭＯＬＤＩＮＧＢＩＮＤＥＲＡＮＤＦＥＥＤＳＴＯＣＫ①ＬｉＹｉｍｉｎ，ＱｕＸｕａｎｈｕｉ，ＨｕａｎｇＢａｉｙｕｎ，ＱｉｕＧｕａｎｇｈａｎＮａｔｉｏｎａｌＫｅｙＬａｂｏｒａｔｏｒｙ...

关键词： metal injection molding feedstock binder viscosity

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Impacts of land uses on runoff and soil erosion A case study in Hilkot watershed Pakistan

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International Journal of Sediment Research 2011年第3期26卷 343-352页

作者： ZOKAIB S. NASER gh. School of Engineering University of British Columbia-OkanaganCanada

In certain areas of the Hindu Kush-Himalayas（HKH）,ecological situation is depleting day by day and approaching to the point of no return through gradual environmental *** soil erosion from most of the areas is a serious threat to sustainable agriculture and sediment accumulation in down stream *** extensive study in the Hilkot watershed,a catchment of Terbala Dam, was started by the People and Resource Dynamics Project in *** objectives of this study were to calculate annual runoff and soil losses from different land uses and compare their seasonal distribution at plot *** experimental plots based on land use classification（***, forests,agricultural,and pasture lands）were *** falls in the monsoon region,about 38% rainfall occurred in the monsoon period（July to September）,while in the pre-monsoon（March to June）and the winter period（October to February）received 35%and 27%of the total rainfall, *** annual rainfall in the watershed was 1160 *** runoff and soil loss pattern varied among different land use *** all the erosion plots,almost 50%of the runoff and soil loss occurred during the monsoon period and was negligible during *** mean maximum runoff was from the degraded plot（674 m;/ha/y）,while minimum was observed from the pasture plot（310 m;/ha/y）.Average runoffs on other land uses were 529 and 460 m;/ha/y,from the forest and agriculture plots,*** soil loss from all land uses ranged between 0.3 to 16.3 t/ha. Average maximum soil loss was recorded from the degraded plot（6.5 t/ha/y）and average minimum （1.8 t/ha/y）was on the pasture ***,average soil from other plots was 3.3 and 3.4 t/ha/y, measured from the forest and agricultural plots,respectively.

关键词： Runoff Soil loss Land use Seasonal distribution Hindu Kush-Himalayan region

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