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Optically invariant InGaN nanowire light-emitting diodes on flexible substrates under mechanical manipulation

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npj Flexible Electronics 2019年第1期3卷 120-125页

作者： Mohsen Asad Renjie Wang Yong-Ho ra Pranav Gavirneni Zetian Mi William S.Wong Department of Electrical and Computer Engineering University of WaterlooWaterlooON N2L 3G1Canada Waterloo Institute for Nanotechnology University of WaterlooWaterlooON N2L 3G1Canada Department of Electrical and Computer Engineering McGill UniversityMontrealQC H3A 0E9Canada Department of Electrical and Computer Engineering University of MichiganAnn ArborMI 48109USA

The integration of GaN-based light-emitting diodes(LEDs)onto flexible platforms provides opportunities for conformal lighting,wearable electronics,and bendable *** this technology may enhance the functionality of the light source,the development of flexible GaN LEDs suffers from performance degradation,when mechanical bending is applied during operation.A unique approach to eliminate the degradation employs dot-in-wire structures,using cylindrical light-emitting heterostructures that protrude above the flexible platform,separating the active light-emitting region from the bending ***,we demonstrate the optical enhancement of nanowire light emitters by changing the geometric orientation within a 1×1 mm^(2) array of nanowires on a flexible platform through bending of the substrate *** flexible structures were achieved by transferring GaN nanowire LEDs from sapphire substrates onto flexible polyethylene terephthalate(PET)using a“paste-and-cut”integration *** I–V characteristics of the nanowire LEDs showed negligible change after integration onto the PET,with a turn-on voltage of 2.5 V and a forward current of 400μA at 4 V.A significant advantage for the nanowire devices on PET was demonstrated by tilting the LEDs through substrate bending that increased the electroluminescence(EL)intensity,while the I–V characteristics and the EL peak position remained *** finite-element analysis and three-dimensional finite-difference time-domain modeling,it was determined that tilting the protruding devices changed the effective distance between the structures,enhancing their electromagnetic coupling to increase light output without affecting the electrical properties or peak emission wavelength of the LEDs.

关键词： diodes sapphire light

Hot Deformation Behavior and Microstructural Characteristics of Ti–46Al–8Nb Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 933-944页

作者： Tian-Rui Li Guo-Huai Liu Mang Xu Tian-Liang Fu Yong Tian ra-Ja Devesh Kumar Misra Zhao-DongWang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and BiomedicalEngineeringUniversity of Texas at E1 PasoE1 PasoTX 79968-0521USA

Hot deformation behavior, microstructural evolution and flow softening mechanism were investigated in Ti-46A1-8Nb alloy via isothermal compression approach. The true stress-strain curves exhibited typical work hardening and flow softening, in which the dependence of the peak stress on temperature and strain rate was obtained by hyperbolic sine equation with Zener-Hollomon （Z） parameter, and the activation energy was calculated to be 446.9 kJ/mol. The microstructural analysis shows that the alternate dark and light deformed ribbons of Al-rich and Nb-rich regions appeared and were associated with local flow involving solute segregation. The Al segregation promoted flow softening mainly arising from the recrystaUization of V phase with low stacking fault energy. The coarse recrystallized 7 and several massive phase were observed at grain boundaries. While in the case of Nb segregation, t/B2 phase harmonized bending of lamellae, combined with the growth of recrystallized γ grains and α ＋ β ＋ γ→α＋ γ transition under conditions of temperature and stress, leading to the breakdown of α2/γ lamellar colony. During the hot compression process, gliding and dissociation of dislocations occurred in γ phase that acted as the main softening mechanism, leading to extensive γ twins and cross twins in α/γ lamellae and at grain boundaries. In general, homogeneous microstructure during the hot defor- mation process can be obtained in TiAl alloy with high Nb addition and low Al segregation. The deformation substructures intrinsically promote the formability of Ti--46Al-8Nb alloy.

关键词： Titanium aluminides Deformation behavior Activation energy Dynamic recrystallization Local flow softening

AASLD practice guidance on drug,herbal,and dietary supplement-induced liver injury:also useful for hepatobiliary surgeons

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Hepatobiliary Surgery and Nutrition 2023年第5期12卷 746-751页

作者： Jose María Pinazo-Bandera Miren García-Cortés raúl J.Andrade Service of Gastroenterology and Hepatology University Hospital Virgen de la VictoriaInstituto de Investigación Biomédica de Málaga y Plataforma en Nanomedicina-IBIMA Plataforma BionandUniversidad de MálagaMálagaSpain Centro de Investigación Biomédico en Red Enfermedades Hepáticas y Digestivas(CIBERehd) MadridSpain

Drug-induced liver injury(DILI)is a term used to describe an unexpected liver reaction to drugs,but also to herbal products and dietary supplements(HDS).In the current therapeutic armamentarium,only a small number of available drugs are still capable of causing liver damage in *** include,in addition to paracetamol-the prototypical example of this group-niacin(now rarely used to treat hypercholesterolaemia),intravenous methotrexate and probably ketamine(an intravenous hypnotic used in critically ill patients for rapid sequence induction)(1).

关键词： Drug-induced liver injury(DILI) hepatotoxicity causality assessment Revised Electronic Causality Assessment Method(RECAM)

Four buildings and a flush:Lessons from degraded water quality and recommendations on building water management

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Environmental Science and Ecotechnology 2024年第2期18卷 104-113页

作者： Kyungyeon ra Caitlin Proctor Christian Ley Danielle Angert Yoorae Noh Tolulope Odimayomi Andrew J.Whelton Lyles School of Civil Engineering Purdue University550 Stadium Mall DriveWest LafayetteIN47907USA Agricultural and Biological Engineering Division of Environmental and Ecological EngineeringPurdue UniversityWest LafayetteIN47907USA Division of Environmental and Ecological Engineering Purdue UniversityWest LafayetteIN47907USA Civil and Environmental Engineering University of Colorado1111 Engineering DriveBoulderCO80309USA Civil Architectural and Environmental EngineeringUniversity of Texas301E E Dean Keeton StreetAustinTX78712USA Civil and Environmental Engineering Virginia Tech750 Drillfield DriveBlacksburgVA24061USA Lyles School of Civil Engineering Division of Environmental and Ecological EngineeringPurdue University550 Stadium Mall DriveWest LafayetteIN47907USA

A reduction in building occupancy can lead to stagnant water in plumbing,and the potential consequences for water quality have gained increasing *** investigate this,a study was conducted during the COVID-19 pandemic,focusing on water quality in four institutional *** of these buildings were old(>58 years)and large(>19,000 m2),while the other two were new(>13 years)and small(rarely detectable in cold/drinking water ***,the pH,dissolved oxygen,total organic carbon,and total cell count levels in the first draw of cold water samples were similar across all ***,the ranges of heavy metal concentrations in large buildings were greater than observed in small ***(Cu),lead(Pb),and manganese(Mn)sporadically exceeded drinking water limits at cold water fixtures,with maximum concentrations of 2.7 mg Cu L^(-1),45.4 mg Pb L^(-1),1.9 mg Mn L^(-1).Flushing the plumbing for 5 min resulted in detectable residual at fixtures in three buildings,but even after 125 min of flushing in largest and oldest building,no residual chlorine was detected at the fixture closest to the building's point of *** the pandemic,the building owner conducted fixture flushing,where one to a few fixtures were operated per visit in buildings with hundreds of fixtures and multiple ***,further research is needed to understand the fundamental processes that control faucet water quality from the service line to the *** the absence of this knowledge,building owners should create and use as-built drawings to develop flushing plans and conduct periodic water testing.

关键词： COVID-19 pandemic Stagnation Drinking water quality Flushing

Sensitivity of Snowfall Characteristics to Meteorological Conditions in the Yeongdong Region of Korea

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Advances in Atmospheric Sciences 2021年第3期38卷 413-429页

作者： Yoo-Jun KIM So-ra IN Hae-Min KIM Jin-Hwa LEE Kyu rang KIM Seungbum KIM Byung-Gon KIM High Impact Weather Research Department National Institute of Meteorological SciencesGangneung 25457Korea Operational Systems Development Department National Institute of Meteorological SciencesSeogwipo 63568Korea Department of Atmospheric Environmental Sciences Gangneung-Wonju National UniversityGangneung 25457Korea

This study investigates the characteristics of cold clouds and snowfall in both the Yeongdong coastal and mountainous regions under different meteorological conditions based on the integration of numerical modeling and three-hourly rawinsonde observations with snow crystal photographs for a snowfall event that occurred on 29−30 January *** found that rimed particles predominantly observed turned into dendrite particles in the latter period of the episode when the 850 hPa temperature decreased at the coastal site,whereas the snow crystal habits at the mountainous site were largely needle or rimed *** soundings showed a well-defined,two-layered cloud structure along with distinctive wind-directional shear,and an inversion in the equivalent potential temperature above the low-level cloud *** first experiment with a decrease in lower-layer temperature showed that the low-level cloud thickness was reduced to less than 1.5 km,and the accumulated precipitation was decreased by 87%compared with the control *** difference in precipitation amount between the single-layered experiment and control experiment(two-layered)was not so significant to attribute it to the effect of the seeder−feeder *** precipitation in the last experiment by weakening winddirectional shear was increased by 1.4 times greater than the control experiment specifically at the coastal site,with graupel particles accounting for the highest proportion(~62%).The current results would improve snowfall forecasts in complicated geographical environments such as Yeongdong in terms of snow crystal habit as well as snowfall amount in both time and space domains.

关键词： Yeongdong snow crystal rawinsonde cloud-resolving model

Examination of the Illness Representations among Children with T1DM in Relation to Mental Health Factors

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International Journal of Mental Health Promotion 2023年第8期25卷 961-969页

作者： Brigitta Munkácsi EnikőFelszeghy Flóra Kenyhercz Beáta Erika Nagy Faculty of Medicine Department of Pediatrics Pediatric Psychology and Psychosomatic UnitKálmán Laki Doctoral SchoolUniversity of DebrecenDebrecen4032Hungary Department of Behavioural Sciences University of DebrecenDebrecen4032Hungary

The most common comorbid psychiatric disorders in children with type 1 diabetes mellitus(T1DM)are depression,anxiety and behavioral *** with comorbid psychopathology are less capable of psychically adjusting to the new life situation resulting from T1DM,which may negatively affect glycemic control and adherence related to the *** aimed to investigate the association between mental health and type 1 diabetes including illness representation.115 children and adolescents with T1DM were recruited through the outpatient clinic in Debrecen,***:PRISM-D,Child Depression Inventory(CDI),Cantril Ladder and Self-rated Health,Glycosylaeted haemoglobin(HbA1C)were *** having depressive symptoms drew fewer circles with less *** not drawing any important relationships possessed more depressive *** diagnosed at a younger age displayed smaller distance between the Self-and *** PRISM-D test can be a promising tool to analyse emotional and cognitive representations and the psychological burden of T1DM.

关键词： T1DM illness representation mental health depression children and adolescents

A New Enhanced Arabic Light Stemmer for IR in Medical Documents

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Computers, Materials & Continua 2021年第7期68卷 1255-1269页

作者： ra’ed M.Al-Khatib Taha Zerrouki Mohammed M.Abu Shquier Amar Balla Asef Al-Khateeb Department of Computer Sciences Yarmouk UniversityIrbid21163Jordan Faculty of Sciences and Applied Sciences Bouira UniversityBouiraAlgeria Faculty of Computer Science and Information Technology Jerash UniversityJordan Ecole Nationale Supérieure d’Informatique(ESI) AlgiersAlgeria Department of Computer Science College of Shari’a and Islamic Studies in Al AhsaaImam Mohammad Ibn Saud Islamic University(IMSIU)Saudi Arabia

This paper introduces a new enhanced Arabic stemming algorithm for solving the information retrieval problem,especially in medical *** proposed algorithm is a light stemming algorithm for extracting stems and roots from the input *** of the main challenges facing the light stemming algorithm is cutting off the input word,to extract the initial *** initiating the light stemmer with strong initial segments,the final extracting stems and roots will be more ***,a new enhanced segmentation based on deploying the Direct Acyclic Graph(DAG)model is *** addition to extracting the powerful initial segments,the main two procedures(i.e.,stems and roots extraction),should be also reinforced with more efficient operators to improve the final *** validate the proposed enhanced stemmer,four data sets are *** achieved stems and roots resulted from our proposed light stemmer are compared with the results obtained from five other well-known Arabic light stemmers using the same data *** evaluation process proved that the proposed enhanced stemmer outperformed other comparative stemmers.

关键词： Machine learning information retrieval systems medical documents stemming algorithms arabic light stemmer natural language processing

Selecting and applying quantification models for ecosystem services to forest ecosystems in South Korea

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Journal of Forestry Research 2016年第6期27卷 1373-1384页

作者： Hyun-Ah Choi Woo-Kyun Lee Cholho Song Nicklas Forsell Seongwoo Jeon Joon Soon Kim So ra Kim Department of Environmental Science and Ecological Engineering Korea University Seoul 02841 Republic of Korea Ecosystems Services and Management Program International Institute for Applied Systems AnalysisSchlossplatz 1 2361 Laxenburg Austria Department of Forest Management Kangwon National University Chuncheon 24341 Republic of Korea Korea Forest Conservation Association 186 Dongjak-daeroSeocho-gu Seoul 06559 Republic of Korea

There is growing interest in using ecosystem services to aid development of management strategies that target sustainability and enhance ecosystem support to humans. Challenges remain in the search for methods and indicators that can quantify ecosystem services using metrics that are meaningful in light of their high priorities. We developed a framework to link ecosystems to human wellbeing based on a stepwise approach. We evaluated prospective models in terms of their capacity to quantify national ecosystem services of forests. The most applicable models were subsequently used to quantify ecosystem services. The Korea Forest Research Institute model sat- isfied all criteria in its first practical use. A total of 12 key ecosystem services were identified. For our case study, we quantified four ecosystem functions, viz. water storage capacity in forest soil for water storage service, reduced suspended sediment for water purification service, reduced soil erosion for landslide prevention service, and reduced sediment yield for sediment regulation service. Water storage capacity in forest soil was estimated at 2142 t/ha, and reduced suspended sediment was estimated at 608 kg/ ha. Reduced soil erosion was estimated at 77 m^3/ha, and reduced sediment yield was estimated at 285 m^3/ha. These results were similar to those reported by previous studies. Mapped results revealed hotspots of ecosystem services around protected areas that were particularly rich in bio- diversity. In addition, the proposed framework illustrated that quantification of ecosystem services could be sup- ported by the spatial flow of ecosystem services. However, our approach did not address challenges faced when quantifying connections between ecosystem indicators and actual benefits of services described.

关键词： Classification Ecosystem services Quantification Stepwise approach

Characteristics of environmental factors associated with typhoon Kongrey(1825) over the Eastern Coastal Region of Korea

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Tropical Cyclone Research and Review 2020年第3期9卷 162-171页

作者： So-ra In Baek-Jo Kim Hae-Min Kim Chang-Geun Park High Impact Weather Research Center Observation and Forecast Research DivisionNational Institute of Meteorological SciencesKMASouth Korea

In this study,the characteristics of environmental factors associated with typhoon Kongrey were examined using radiosonde,wind-profiler,radar,and Automated Surface Observing System(ASOS)data in Uljin,which is located the eastern coast of *** radiosonde data were obtained from intensive observation between 1500 LST 5 to 0000 LST 7 October *** factors such as Total Precipitable Water(TPW)and Strom Relative Environmental Helicity(SREH)were selected to examine their relations to typhoon-accompanied *** TPW peak with 60.54 mm appeared at 1200 LST 6 October,which is 6 h after the peak of typhoon *** was found that the TPW variation is largely associated with the effect of water vapor supply from the typhoon with nearest proximity to Uljin at 1500 LST 6 *** SREH,which indicates mechanical instability,was 761 m2 s-2 during the period in which typhoon precipitation *** environments would provide a good condition for the development of super-cell storms,causing heavy precipitation associated with *** addition,it was found that the correlation coefficient between SREH and typhoon rainfall is 0.8(p-value=0.02).

关键词： Typhoon Kongrey Precipitation TPW SREH