检索结果-南通市图书馆

Comparative study of Sm^(3+) ions doped phosphate based oxide and oxy-fluoride glasses for solid state lighting applications

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2019年第4期37卷 374-382页

作者： M.Shoaib G.Rooh R.Rajaramakrishna N.Chanthima N.Kiwsakunkran H.j.Kim j.Kaewkhao S.Tuscharoen Department of Physics Abdul Wali Khan University Center of Excellence in Class Technology and Materials Science (CEGM) Nakhon Pathom Rajabhat University Physics Program Faculty of Science and TechnologyNakhon Pathom Rajabhat University Department of Physics Kyungpook National University

The physical and luminescent properties of Sm^(3+)-doped oxide and oxy-fluoride phosphate glasses were investigated. The glass samples with chemical composition of 69 P_2 O_5-10 BaO-10 ZnO-10 Gd_2 O_3-1 Sm_2 O_3 and 69 P_2 O_5-10 BaO-10 ZnO-10 GdF_3-1 Sm_2 O_3 were prepared by conventional melt quenching technique. The prepared glass samples were characterized with density, molar volume, refractive index,FTIR, UV-Vis-NIR, photo luminesce nce, radio luminescence, decay time profile and CIE diagram. The density and refractive index of the oxide glass have higher values as compared to the oxy-fluoride *** FTIR spectra show the reduction of O-H group in oxy-fluoride glass. The characteristic peaks of Sm^(3+)are observed at 360,372,402,438,419,473,944,1077,1227,1373,1474,1529 and 1585 nm in UV-VIS-NIR spectra. These peaks are related respectively to the transitions from ground state ~6 H_(5/2) to ~4 D_(3/2), ~6 P_(7/2),6 P3/2, ~4 I_(11/2), ~6 F_(11/2), ~6 F_(9/2), ~6 F_(7/2),~6 F_(5/2),~6 F_(3/2), ~6 H_(15/2) and ~6 F_(1/2) excited states. From photoluminescence and radio-luminesce nce it is observed that the oxy-fluoride glass samples show better emission intensity than the oxide glass. The judd-Ofelt theory(j-0 theory) was used to find j-O intensity Ω_λ(λ = 2,4 and 6)parameters and radiative properties such as transition probability, stimulated emission cross section and branching ratios for titled glasses. The trend observed in the j-O parameters is Ω_4 >Ω_2 >Ω_6. The transition probability,emission cross section and branching ratio have the highest values for the ~4 G_(5/2)→~6 H_(7/2)transition. The CIE coordinates of the prepared glass samples are positioned in the orange region and the CCT value is 3776.105 for oxide and oxyfluoride glass. The oxy-fluoride glass has shorter decay time as compared to the oxide glass and it is recorded to be 1.62 and 1.32 ms for oxide and oxy-fluoride respectively. According to the results obtained in this work, it is obvious t

关键词： Oxy-fluoride glass Photoluminescence judd-Ofelt theory CIE coordinates Rare earths

Video-rate multimodal multiphoton imaging and three-dimensional characterization of cellular dynamics in wounded skin

在线全文

学校读者我要写书评

暂无评论

journal of Innovative Optical Health Sciences 2020年第2期13卷 70-80页

作者： joanne Li Madison N.Wilson Andrew j.Bower Marina Marjanovic Eric j.Chaney Ronit Barkalifa Stephen A.Boppart Department of Bioengineering University of Illinois at Urbana-Champaign Urbana ILU.S.A Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana ILU.S.A Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana ILU.S.A Carle Illinois College of Medicine University of Illinois at Urbana-Champaign Urbana ILU.S.A

To date,numerous studies have been performed to elucidate the complex cellular dynamics in skin diseases,but few have attempted to characterize these cellular events under conditions similar to the native *** address this challenge,a three-dimensional(3D)multimodal analysis platform was developed for characterizing in vivo cellular dynamics in skin,which was then utilized to process in vivo wound healing data to demonstrate its *** attention is focused on in vivo biological parameters that are difficult to study with ex vivo analysis,including 3D cell tracking and techniques to connect biological information obtained from different imaging *** results here open new possibilities for evaluating 3D cellular dynamics in vivo,and can potentially provide new tools for characterizing the skin microenvironment and pathologies in the future.

关键词： Cellular dynamics multimodal imaging multiphoton microscopy

Mapping Sea Level Rise Behavior in an Estuarine Delta System：A Case Study along the Shanghai Coast

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2018年第1期4卷 156-163页

作者： H.Q. Cheng j.Y. Chen Z.j. Chen R.L. Ruan G.Q. Xu G. Zeng j.R. Zhu Z.j. Dai X.Y. Chen S.H. Gu X.L. Zhang H.M. Wang State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China Shanghai Water Planning Design and Research Institute Shanghai 200232 China Shanghai Water Authority Shanghai 200050 China School of Urban and Regional Science East China Normal University Shanghai 200062 China School of Ecological and Environmental Sciences East China Normal University Shanghai 200062 China Shanghai Hydrological Station Shanghai 200232 China Shanghai Municipal Bureau of Urban Planning and Land Resources Shanghai 200003 China Shanghai Institute of Geological Survey Shanghai 200072 China

Sea level rise (SLR) is a major projected threat of climate change that is expected to affect developing coastal cities located in estuarine delta regions. Shanghai is one such city, being located in the Yangtze River Delta (YRD). It is difficult, however, for decision-makers to implement adaptation due to the uncertain causes, magnitudes, and timings of SLR behaviors. This paper attempts to map the causes and magnitudes of SLR behaviors on a decadal scale. We analyze the tidal level records from 11 tidal gauge stations and the corresponding bathymetry measurements around these stations since 1921. We identify three new SLR behaviors along the Shanghai coast due to anthropogenic geomorphologic changes (AGCs), besides the well-known eustatic sea level rise (ESLR), tectonic subsidence (TS), and urban land subsidence (ULS). The first new behavior is regional sea level rise (RSLR), which occurs as a result of land reclamation and deep waterway regulation. The second is regional sea level fall (RSLF), which occurs because the channel bed is eroded due to sediment supply decline in the river catchment. The last SLR behavior is local tidal datum rise (LTDR). Thus, we project that the magnitude of SLR for the Shanghai coast ranges from 10 cm to 16 cm from 2011 to 2030. Clarifying SLR behaviors is important to aid local decisionmakers in planning structural and non-structural measures to combat escalating flood damage costs in an estuarine delta system; this field is full of future challenges.

关键词： Sea level rise behavior Anthropogenic geomorphologic change Local tidal datum Flood management Adaptation

Preparation and photocatalytic property of Fe_(2)O_(3)/ZnO composites with superhydrophobicity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1072-1079页

作者： Muntadher I.Rahmah Raad S.Sabry Wisam j.Aziz Physics Department College of ScienceMustansiriyah UniversityBaghdad 10052Iraq

A facile approach was developed to construct Fe_(2)O_(3)-modified ZnO micro/nanostructures with excellent superhydrophobicity and photocatalytic *** effects of stearic acid(SA)and Fe_(2)O_(3) on the morphological characteristics,water contact angle(WCA),and photocatalytic degradation were *** results showed that WCA increased from 144°±2°to 154°±2°when the weight of SA increased from 5 to 20 mg because of the formation of a hierarchical or rough ***,Fe_(2)O_(3)-modified ZnO micro/nanostructure surfaces before and after SA treatment(20 mg)were chosen to evaluate the photodegradation of methylene blue(MB)dye under the support of visible *** degraded after 80 min of irradiation,and its photodegradation efficiencies were 91.5%at the superhydrophobic state and 92%at the hydrophilic *** improvement in photocatalytic activity at both states might be attributed to an increase in surface area and improvement in charge carrier separation.

关键词： nano composites stearic acid superhydrophobic photocatalytic self-cleaning

ANTIMONY GRAIN BOUNDARY SEGREGATION AND ITS SUPPRESSION BY CERIUM IN Fe-2%Mn-Sb STRUCTURAL STEELS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 175-182页

作者： Z.X.Yuan A.M.Guo j.Liu D.D.Shen j.jia S.H.Song School of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Research Institute of Wuhan Iron and Steel Company Wuhan 430080 China Materials Group Department of Mechanical EngineeringBrunel Uliversity Uxbridge Middlesex UBS 3PHUK

Antimony grain boundary segregation in Fe-2%Mn-Sb structure steels has been studied through measurements of the ductile-brittle transition temperature in conjunction with scanning electron microscopy, Auger electron spectroscopy and secondary ion mass spectroscopy. The research result reveals that during tempering or ageing after quenching at 980℃, Sb segregates to grain boundaries with both equilibrium and non-equilibrium natures and brings about temper embrittlement in the steels. Cerium can relieve temper embrittlement of the steels and its segregation to grain boundaries may play an important role in reducing this embrittlement.

关键词： segregation grain boundary rare-earth embrittlement

Coating processes towards selective laser sintering of energetic material composites

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第2期16卷 316-324页

作者： Zetu jiba Walter W.Focke Lonji Kalombo Moshawe j.Madito Council for Scientific and Industrial Research(CSIR) Defence Peace Safety and SecurityP.O Box 395Pretoria 0001South Africa University of Pretoria South Africa CSIR Chemical ClusterSouth Africa

This research aims to contribute to the safe methodology for additive manufacturing(AM)of energetic *** formulation processes were investigated and evaluated to find a suitable method that may enable selective laser sintering(SLS)as the safe method for fabrication of high explosive(HE)*** safety and co nvenie nce reasons,the co ncept demonstration was conducted using inert explosive simulants with properties quasi-similar to the real *** processes for simulant RDXbased microparticles by means of PCL and 3,4,5-trimethoxybenzaldehyde(as TNT simulant)are *** processes were evaluated for uniformity of coating the HE inert simulant particles with binder materials to facilitate the SLS as the adequate binding and fabrication *** system and single emulsion methods gave required particle near spherical morphology,size and uniform *** suspension process appears to be suitable for the SLS of HE mocks and potential formulation methods for active HE *** density is estimated to be comparable with the current HE compositions and plastic bonded explosives(PBXs)such as C4 and PE4,produced from traditional *** formulation method developed and understanding of the science behind the processes paves the way toward safe SLS of the active HE compositions and may open avenues for further research and development of munitions of the future.

关键词： Coating processes Energetic materials Simulants Mock explosives Additive manufacturing Selective laser sintering

Real-time ultrasound-guided versus landmark-guided subclavian vein catheterization in the intensive care unit: a prospective randomized study

在线全文

学校读者我要写书评

暂无评论

Emergency and Critical Care Medicine 2023年第2期3卷 51-56页

作者： Sujit j.Kshirsagar Sanyogita V.Naik Anandkumar H.Pande Pradnya M.Bhalerao Chandraprabhu Birnale Shivprasad Thorve Department of Anaesthesiology and Critical Care B.J.Govt.Medical College and Sassoon General HospitalsPuneIndia

Background:The subclavian vein(SCV)is an alternative to the internal jugular vein when it is difficult to locate,such as in patients with hypovolemia or ***(USG)guidance for SVC cannulation has evolved,resulting in fewer complications and higher first-pass success *** study aimed to compare the effectiveness and safety of SCV cannulation with USG-and landmark-guided ***:In this prospective randomized interventional controlled study,80 patients admitted to the intensive care unit between july 2022 and October 2022 were randomly assigned to the landmark method group(LM group)and USG *** the LM group,SCV cannulation was performed using the traditional landmark technique,whereas in the USG group,it was performed using USG *** primary objective of this study was to evaluate the ease of subclavian central venous cannulation in critically ill patients using the 2 *** secondary objectives were to compare the success rate of cannulation between these 2 techniques,evaluate the number of attempts,assess cannulation failure,and assess mechanical ***:The first-pass success rates were 70%and 92.5%in the LM and USG groups,respectively(Pjugular vein *** average time to cannulation was longer in the USG group than in the LM group,which can decrease with the frequent use of USG and increasing operator *** trials:This study was registered in the Clinical Trials Registry-India(CTRI Trial ***/2022/07/0

关键词： Central venous cannulation Landmark method Subclavian vein Ultrasonography

Predictive roles of organizational and personal factors in work engagement among nurses

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Nursing 2022年第4期9卷 379-387页

作者： Charlie C.Falguera Leodoro j.Labrague janet Alexis A.De Los Santos Carmen N.Firmo Konstantinos Tsaras School of Health Sciences University of the Philippines ManilaLeyteManila 2801Philippines School of Nursing Loyola University ChicagoIllinois 60660United States College of Nursing Visayas State UniversityBaybayLeyte 6521APhilippines Department of Nursing Technological Educational Institute of ThessalyKarditsaThessaly 43100Greece

Objective:To determine the work engagement levels of hospital nurses and the predictive roles that nurses’personal and organizational characteristics ***:A cross-sectional design was employed in this study,which included 549 nurses working in the Central *** were selected through purposive sampling,and a self-repor t questionnaire outlining personal and organizational characteristics was *** Utrecht Work Engagement Scale(UWES)was applied to gather data about nurse ***:The dedication score was the highest among the three dimensions of engagement while the vigor score was the ***,Filipino nurses experienced an average level of work *** observed significant relationships between a nurse’s age,years of experience in nursing,years in their present unit,and their position at work and their levels of engagement,vigor,sense of dedication,and *** capacity was a negative predictor of vigor,dedication,absorption,and overall work *** ther,the type of nursing contract was a negative predictor of vigor and *** type of hospital and the nurse’s position were positive predictors of vigor,dedication,and ***:Filipino nurses were satisfactorily engaged at work.A number of nurses’personal and organizational characteristics play a predictive role in their work ***,nursing administrators must suppor t,develop,and implement activities and measures that engage nurses at work.

关键词： Filipino nurses nurse personal factors organizational factors work engagement work engagement predictors

Numerical Methods for Safeguarding the Performance of the Quenching Process

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5期25卷 519-521页

作者： I.FELDE T.RETI S.Segerberg j.Bodin G.S.Sarmiento G.E.Totten j.GU BayZoltánInstituteforMaterialsScienceandTechnology BudapestHungary BudapestPolytechnic BudapestHungary IVEMoelndal Sweden UniversidaddeBuenosAires BuenosAiresArgentina G.E.Totten＆Associates LLCSeattleU.S.A. ShanghaijiaoTongUniversity ShanghaiPublicRepublicofChina

A new numerical technique for testing and evaluation of quenching media and quenching systems is outlined. The measured time-temperature samples as a result of cooling curve test are analyzed by the new software developed, in order to characterize quantitatively the quenchants. The method applied is based on Fourier analysis. Examples for evaluation and comparison of cooling performance of quenchants are presented the applicability of the computational technique.

关键词：淬火冷却曲线控制范围最佳化判定支持