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Global optimum of microstructure parameters in the CMWP line-profile-analysis method by combining Marquardt-Levenberg and Monte-Carlo procedures

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Journal of Materials Science & Technology 2019年第7期35卷 1508-1514页

作者： Gabor Ribarik Bertalan joni Tamas Ungar Department of Materials Physics Edtvos University BudapestPO Box 32H-15J8Hungary School of Materials The University of ManchesterM139PLUK

Line profile analysis of X-ray and neutron diffraction patterns is a powerful tool for determining the microstructure of crystalline materials. The Convolutional-Multiple-Whole-Profile (CMWP) procedure is based on physical profile functions for dislocations, domain size, stacking faults and twin boundaries. Order dependence, strain anisotropy, hkl dependent broadening of planar defects and peak shape are used to separate the effect of different lattice defect types. The Marquardt-Levenberg (ML) numerical optimiza-tion procedure has been used successfully to determine crystal defect types and densities. However, in more complex cases like hexagonal materials or multiple phases the ML procedure alone reveals uncer-tainties. In a new approach the ML and a Monte-Carlo statistical method are combined in an alternative manner. The new CMWP procedure eliminates uncertainties and provides globally optimized parameters.

关键词： X-ray line profile analysis Neutron line profile analysis CMWP Global optimum Dislocation densities Grain size Planar defects Monte-Carlo method

Seasonal comparison of moss bag technique against vertical snow samples for monitoring atmospheric pollution

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Journal of Environmental Sciences 2016年第3期28卷 128-137页

作者： Hanna Salo Anna-Kaisa Berisha joni M?kinen Department of Geography and Geology University of Turku Centre for Research of Lifelong Learning and Education(CELE) University of Turku

This is the first study seasonally applying Sphagnum papillosum moss bags and vertical snow samples for monitoring atmospheric *** bags,exposed in January,were collected together with snow samples by early March 2012 near the Harjavalta Industrial Park in southwest ***,chemical,scanning electron microscopy-energy dispersive X-ray spectroscopy（SEM-EDX）,K-means clustering,and Tomlinson pollution load index（PLI）data showed parallel spatial trends of pollution dispersal for both *** strengthen previous findings that concentrate and slag handling activities were important（dust）emission sources while the impact from Cu–Ni smelter＇s pipe remained secondary at closer *** significant correlations existed between the variables of snow and moss *** a summary,both methods work well for sampling and are efficient pollutant *** bags can be used also in winter conditions and they provide more homogeneous and better controlled sampling method than snow samples.

关键词： Biomonitoring Industrial pollution Heavy metal Magnetic susceptibility Scanning electron microscopy-energy dispersive X-ray spectroscopy

Influence of emergent macrophyte (Phragmites australis) density on water turbulence and erosion of organic-rich sediment

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Journal of Hydrodynamics 2013年第2期25卷 288-293页

作者： HORPPILA Jukka KAITARANTA joni JOENSUU Laura NURMINEN Leena Department of Environmental Sciences University of Helsinki

The effects of the emergent macrophyte Phragmites australis on water turbulence, bottom shear velocity and water turbidity were experimentally studied with the stem densities 0 stems/m2-100 stems/m2 and using organic-rich sediment. It is found that the maximum root-mean-square （rms） velocity and shear velocity decrease linearly with increasing stem density. By affecting the height of peak turbulence values, emergent plants can thus lower the frequency of sediment erosion events. Additionally, the slope of the rms turbulence increment decreases with increasing stem density. Thus, also the duration of strong turbulence is affected by the density of emergent macrophytes. The critical shear velocity for sediment resuspension is 0.0035 m/s-0.0055 rn/s and not affected by the stem density. In the absence of macrophytes, water flow causes a 6.3-fold increment in turbidity, but with macrophytes turbidity values remain lower. The experiments suggest that even relatively low densities of Phragmites can have substantial effects on water turbulence and consequently on water quality.

关键词： emergent macrophytes turbulence shear velocity resuspension turbidity

Identity-aware convolutional neural networks for facial expression recognition

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Journal of Systems Engineering and Electronics 2017年第4期28卷 784-792页

作者： Chongsheng Zhang Pengyou Wang Ke Chen joni-Kristian Kamarainen The Big Data Research Center Henan University Kaifeng 475001 China Department of Signal Processing Tampere University of Technology Tampere 33720 Finland

Facial expression recognition is a hot topic in computer vision, but it remains challenging due to the feature inconsistency caused by person-specific 'characteristics of facial expressions. To address such a challenge, and inspired by the recent success of deep identity network (DeepID-Net) for face identification, this paper proposes a novel deep learning based framework for recognising human expressions with facial images. Compared to the existing deep learning methods, our proposed framework, which is based on multi-scale global images and local facial patches, can significantly achieve a better performance on facial expression recognition. Finally, we verify the effectiveness of our proposed framework through experiments on the public benchmarking datasets JAFFE and extended Cohn-Kanade (CK+).

关键词： facial expression recognition deep learning classification identity-aware

Application of a littoral Baltic Sea resuspension model in a eutrophic lake-factors behind differences in the model performance

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International Journal of Sediment Research 2015年第2期30卷 100-106页

作者： Jukka Horppila joni Kaitaranta Leena Nurminen Department of Environmental Sciences University of Helsinki

The performance of a linear resuspension model developed in the Baltic Sea was studied in the conditions of a eutrophic Lake Kirkkoj(a|¨)rvi(southern Finland).The model predicts sediment resuspension rate using data on vegetation cover,wind and sediment quality as an *** the original model coefficients were used,the model resulted on average 1.8 fold overestimation of the resuspension rate in Kirkkoj(a|¨)*** was due to lower fetch and water depth,and less consolidated sediment of Kirkkoj(a|¨)rvi compared with the Baltic Sea study *** coefficients were adjusted for Kirkkoj(a|¨)rvi,the model predictions were 1.1 times the measured *** to the continuous resuspension,the effect of the wind term in the model was so low that it could be excluded without affecting the accuracy of model *** study demonstrated that in a shallow eutrophic lake accurate predictions on resuspension rate can be made using only data on sediment quality and on factors inhibiting resuspension(macrophytes).The model residuals increased with increasing resuspension rate and high rates of resuspension were underestimated by the *** to the fluffy sediment in Kirkkoj(a|¨)rvi,erosion of sediment increases more than linear with increasing shear *** in such conditions,even better predictions could be achieved by a non-linear resuspension model.

关键词： Linear model Sediment resuspension Macrophytes Wind Sediment quality

Shift to a low carbon society through energy systems design

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Science China(Technological Sciences) 2010年第1期53卷 134-143页

作者： Toshihiko NAKATA Mikhail RODIONOV Diego SILVA joni JUPESTA Department of Management Science and Technology Graduate School of EngineeringTohoku UniversityAoba-yama 6-6-11-815Sendai 980-8579Japan

Concern about global warming calls for an advanced approach for designing an energy system to reduce carbon emissions as well as to secure energy security for each *** energy systems tend to introduce different technologies with high conversion efficiency,leading to a higher average *** energy systems can be achieved not by an aggregate form of conversion technologies but by an innovative system design *** concept of LCS(low carbon society) is a unique approach having multi-dimensional considerations such as social,economic and environmental *** LCS aims at an extensive restructuring of worldwide energy supply/demand network system by not only replacing the conventional parts with the new ones,but also integrating all the necessary components and designing absolutely different energy *** a core tool for the LCS design,energy-economic models are applied to show feasible solutions in future with alternatives such as renewable resources,combined heat and power,and smart grid *** can introduce changes in energy markets,technology learning in capacity,and penetration of innovative technologies,leading to an optimum system configuration under priority *** paper describes recent trials of energy models application related to waste-to-energy,clean coal,transportation and rural *** the modelling approach is still under investigation,the output clearly shows possible options having variety of technologies and linkages between supply and demand *** of the LCS means an energy systems design with the modelling approach,which gives solution for complex systems,choices among technologies,technology feasibility,R&D targets,and what we need to start.

关键词： low carbon society(LCS) energy systems systems approach clean energy technologies energy models

Estimation of postseismic deformation parameters from continuous GPS data in northern Sumatra after the 2004 Sumatra-Andaman earthquake

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Earthquake Science 2015年第5期28卷 347-352页

作者： Bimar Anugrah Irwan Meilano Endra Gunawan joni Efendi Geodesy and Geomatics Engineering Faculty of Earth Science and TechnologyBandung Institute of Technology Graduate Research on Earthquake and Active Tectonics Faculty of Earth Science and TechnologyBandung Institute of Technology Geospatial Information Agency

Continuous global positioning system （GPS） in northern Sumatra detected signal of the ongoing physical process of postseismic deformation after the M9.2 2004 Sumatra-Andaman earthquake. We analyze the character- istics of postseismic deformation of the 2004 earthquake based on GPS networks operated by BIG, and the others named AGNeSS, and SuGAr networks located in northern Sumatra. We use a simple analytical logarithmic and exponential function to evaluate the postseismic deforma- tion parameters of the 2004 earthquake. We find that GPS data in northern Sumatra during time periods of 2005-2012 are fit better using the logarithmic function with dog of 104.2 ± 0.1 than using the exponential function. Our result clearly indicates that other physical mechanisms of post- seismic deformation should be taken into account rather than a single physical mechanism of afterslip only.

关键词： The 2004 Sumatra-Andaman earthquakeContinuous GPS data Logarithmic and exponential functions

Investigation of the passive behaviour of AZ31B alloy in alkaline solutions

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Journal of Magnesium and Alloys 2014年第2期2卷 175-180页

作者： A.Fattah-alhosseini M.Sabaghi joni Faculty of Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

In this work,the passivity of AZ31B alloy in NaOH solutions was studied by potentiodynamic polarization,electrochemical impedance spectroscopy(EIS)and Mott-Schottky *** polarization results indicated that decreasing NaOH concentration leads to decrease the corrosion rate of this *** results showed that the reciprocal capacitance(1/C)of the passive film is directly proportional to its thickness which increases with decreasing NaOH ***,it is clear that dilute NaOH solutions offer better conditions for forming the passive films with higher protection behaviour,due to the growth of a much thicker and less defective *** Mott-Schottky analysis revealed that the passive films displayed n-type semiconductive characteristics,where the oxygen vacancies and interstitials(over the cation vacancies)***,Mott-Schottky results showed that the donor densities evaluated from Mott-Schottky plots are in the range of 10^(20) cm^(−3) and decreased with decreasing NaOH concentration.

关键词： AZ31B alloy EIS Mott-Schottky NaOH Passive film

Porcelain insulation-defining the underlying mechanism of failure

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High Voltage 2019年第2期4卷 81-88页

作者： joni Kluss Mojtaba Rostaghi Chalaki Wilburn Whittington Hongjoo Rhee Samuel Whittington Aref Yadollahi Electrical and Computer Engineering Mississippi State UniversityMississippi StateMSUSA Mechanical Engineering Mississippi State UniversityMississippi StateMSUSA Center for Advanced Vehicular Systems Mississippi State UniversityStarkvilleMSUSA

Porcelain insulators have a long history and wide application range in power systems,but just like any other insulator,they can fail.A number of pole fires occurred on lines utilising porcelain suspension *** some cases,the insulators appeared to be visually intact with no external signs of degradation or abnormal *** prompted a comprehensive assessment to identify the mechanism that leads to the permanent loss of insulating properties while retaining external physical characteristics.A single test is not sufficient to determine the underlying cause of conduction as results may produce contradictory *** tests were able to identify samples with poor dielectric ***,these same samples exhibited excellent mechanical *** successfully passing numerous porosity tests,scanning electron microscopic analysis revealed porosity and multiple microscopic punctures in the porcelain *** upon complete dissection of samples,the conduction mechanism was *** article discusses the challenges associated with establishing the root failure mechanism for the investigated porcelain insulators that allows visually sound samples to lose their insulating properties without experiencing catastrophic failure.

关键词： mechanism porosity conduction