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AutoPhaseNN:unsupervised physics-aware deep learning of 3D nanoscale Bragg coherent diffraction imaging

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npj Computational Materials 2022年第1期8卷 1146-1153页

作者： Yudong Yao Henry Chan Subramanian Sankaranarayanan Prasanna Balaprakash Ross J.Harder mathew J.cherukara Advanced Photon Source Argonne National LaboratoryLemontIL60439USA Center for Nanoscale Materials Argonne National LaboratoryLemontIL60439USA Mathematics and Computer Science Argonne National LaboratoryLemontIL60439USA

The problem of phase retrieval underlies various imaging methods from astronomy to nanoscale *** phase retrieval methods are iterative and are therefore computationally *** learning(DL)models have been developed to either provide learned priors or completely replace phase ***,such models require vast amounts of labeled data,which can only be obtained through simulation or performing computationally prohibitive phase retrieval on experimental *** 3D X-ray Bragg coherent diffraction imaging(BCDI)as a representative technique,we demonstrate AutoPhaseNN,a DL-based approach which learns to solve the phase problem without labeled *** incorporating the imaging physics into the DL model during training,AutoPhaseNN learns to invert 3D BCDI data in a single shot without ever being shown real space *** trained,AutoPhaseNN can be effectively used in the 3D BCDI data inversion about 100×faster than iterative phase retrieval methods while providing comparable image quality.

关键词： coherent iterative replace

Machine learning enabled autonomous microstructural characterization in 3D samples

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npj Computational Materials 2020年第1期6卷 1654-1662页

作者： Henry Chan mathew cherukara Troy D.Loeffler Badri Narayanan Subramanian K.R.S.Sankaranarayanan Center for Nanoscale Materials Argonne National LaboratoryArgonneILUSA Department of Mechanical Engineering University of LouisvilleLouisvilleKYUSA Department of Mechanical and Industrial Engineering University of Illinois at ChicagoChicagoILUSA

We introduce an unsupervised machine learning(ML)based technique for the identification and characterization of microstructures in three-dimensional(3D)samples obtained from molecular dynamics simulations,particle tracking data,or *** technique combines topology classification,image processing,and clustering algorithms,and can handle a wide range of microstructure types including grains in polycrystalline materials,voids in porous systems,and structures from self/directed assembly in soft-matter complex *** technique does not require a priori microstructure description of the target system and is insensitive to disorder such as extended defects in polycrystals arising from line and plane *** demonstrate quantitively that our technique provides unbiased microstructural information such as precise quantification of grains and their size distributions in 3D polycrystalline samples,characterizes features such as voids and porosity in 3D polymeric samples and micellar size distribution in 3D complex *** demonstrate the efficacy of our ML approach,we benchmark it against a diverse set of synthetic data samples representing nanocrystalline metals,polymers and complex fluids as well as experimentally published characterization *** technique is computationally efficient and provides a way to quickly identify,track,and quantify complex microstructural features that impact the observed material behavior.

关键词： microstructure polycrystalline porosity

CEGANN: Crystal Edge Graph Attention Neural Network for multiscale classification of materials environment

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npj Computational Materials 2023年第1期9卷 2106-2117页

作者： Suvo Banik Debdas Dhabal Henry Chan Sukriti Manna mathew cherukara Valeria Molinero Subramanian K.R.S.Sankaranarayanan Center for Nanoscale Materials Argonne National LaboratoryLemontIL 60439USA Department of Mechanical and Industrial Engineering University of IllinoisChicagoIL 60607USA Department of Chemistry The University of UtahSalt Lake CityUT 84112USA Advanced Photon Source Argonne National LaboratoryLemontIL 60439USA

We introduce Crystal Edge Graph Attention Neural Network (CEGANN) workflow that uses graph attention-based architecture tolearn unique feature representations and perform classification of materials across multiple scales (from atomic to mesoscale) anddiverse classes ranging from metals, oxides, non-metals to hierarchical materials such as zeolites and semi-ordered *** can classify based on a global, structure-level representation such as space group and dimensionality (e.g., bulk, 2D,clusters, etc.). Using representative materials such as polycrystals and zeolites, we demonstrate its transferability in performing localatom-level classification tasks, such as grain boundary identification and other heterointerfaces. CEGANN classifies in (thermal)noisy dynamical environments as demonstrated for representative zeolite nucleation and growth from an amorphous ***, we use CEGANN to classify multicomponent systems with thermal noise and compositional diversity. Overall, our approachis material agnostic and allows for multiscale feature classification ranging from atomic-scale crystals to heterointerfaces tomicroscale grain boundaries.

关键词： Crystal classify zeolite

Unveiling the shadows: a qualitative exploration of barriers to rooftop solar photovoltaic adoption in residential sectors

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Clean Energy 2024年第5期8卷 218-228页

作者： Tony C.mathew Sridevi Nagaraja Pandian School of Commerce Kumaraguru College of Liberal Arts and ScienceCoimbatore 641035Tamil NaduIndia

In the face of global climate change,the urgent shift towards renewable energy sources such as solar power is vital for reducing greenhouse gas emissions and fostering a sustainable future,presenting a universal challenge and opportunity for energy policy ***’s adoption of rooftop solar photovoltaic is pivotal due to its vast solar potential,which aligns with national goals to increase renewable energy capacity,reduce carbon emissions,and achieve energy ***’s geographical location offers abundant solar potential,making it a prime candidate for the adoption of rooftop solar photovoltaic *** with the state’s strong commitment to renewable energy initiatives such as the ambitious“SOURA”(solar subsidy program by the Kerala State Electricity Board)project and various incentives for solar adoption,Kerala stands at the forefront of India’s transition towards sustainable energy *** the barriers to rooftop solar photovoltaic adoption in Kerala is crucial for tailoring ef-fective policies and strategies that address specific hindrances from economic constraints to informational *** study employs a qualitative research method to identify the barriers to rooftop solar photovoltaic adoption among households in *** face-to-face interviews with a purposively selected sample of 52 households,the research aims to gain in-depth insights into the multifaceted challenges hindering the widespread adoption of solar energy in residential *** findings reveal several key barriers:financial barriers,informational barriers,technical barriers,regulatory barriers,social barriers,and psychological *** analysis indicates that while there is a predominantly positive attitude towards solar photovoltaic adoption,there are sig-nificant concerns that still need to be *** these barriers with targeted policy interventions and public awareness campaigns could significantly enhance the adoptio

关键词： rooftop solar photovoltaic adoption barriers to solar energy residential solar systems Kerala solar initiatives qualitative analysis in renewable energy

Morphological and molecular description of a new species of sandfly,Sergentomyia(Neophlebotomus)ashwanii ***.(Diptera:Psychodidae)from Western Ghats,India

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Asian Pacific Journal of Tropical Medicine 2024年第5期17卷 226-234页

作者： Prasanta Saini Harish Kumar Shah mathew Jessu Sonia T Tom Anns KP Amju ICMR-Vector Control Research Centre(Field Station) KottayamKeralaIndia

Objective:To report a new species of sandfly,Sergentomyia(Neophlebotomus)ashwanii ***.(Diptera:Psychodidae)from Western Ghats,***:A systematic sandfly survey was conducted in the Thrissur and Kollam districts of Kerala,India using mechanical aspirators,light and sticky traps,both indoor and outdoor habitats,for a period of one *** acid barcoding of samples was performed targeting mitochondrial cytochrome oxidase I(COI)gene and sequence generated was subjected to phylogenetic ***:Sergentomyia(Neophlebotomus)ashwanii,a new sandfly species is recorded and described in this communication.A single row of 10-12 pointed teeth in the cibarium with 4-6 small denticles or fore-teeth are the key characteristics that is distinctive from other members of the subgenus *** COI barcode followed by phylogenetic analysis of the nucleotide sequence confirms that specimens of the species belong to the same taxonomic group while the genetic distance(14.2%)with the congeners established it to be a different ***:The Western Ghats'being an important biodiversity hotspot and has dearth of systematic entomological surveys on *** current study tried to fill the void and also report a new sandfly species.

关键词： Sergentomyia(Neophlebotomus)ashwanii COI barcode Western Ghats Phlebotomine sandflies

Least Square Finite Element Model for Analysis of Multilayered Composite Plates under Arbitrary Boundary Conditions

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World Journal of Engineering and Technology 2024年第1期12卷 40-64页

作者： Christian mathew Yao Fu Department of Engineering Mechanics Virginia Polytechnic Institute and State University Blacksburg Virginia USA Department of Aerospace and Ocean Engineering Virginia Polytechnic Institute and State University Blacksburg Virginia USA

Laminated composites are widely used in many engineering industries such as aircraft, spacecraft, boat hulls, racing car bodies, and storage tanks. We analyze the 3D deformations of a multilayered, linear elastic, anisotropic rectangular plate subjected to arbitrary boundary conditions on one edge and simply supported on other edge. The rectangular laminate consists of anisotropic and homogeneous laminae of arbitrary thicknesses. This study presents the elastic analysis of laminated composite plates subjected to sinusoidal mechanical loading under arbitrary boundary conditions. Least square finite element solutions for displacements and stresses are investigated using a mathematical model, called a state-space model, which allows us to simultaneously solve for these field variables in the composite structure’s domain and ensure that continuity conditions are satisfied at layer interfaces. The governing equations are derived from this model using a numerical technique called the least-squares finite element method (LSFEM). These LSFEMs seek to minimize the squares of the governing equations and the associated side conditions residuals over the computational domain. The model is comprised of layerwise variables such as displacements, out-of-plane stresses, and in- plane strains, treated as independent variables. Numerical results are presented to demonstrate the response of the laminated composite plates under various arbitrary boundary conditions using LSFEM and compared with the 3D elasticity solution available in the literature.

关键词： Multilayered Composite and Sandwich Plate Transverse Stress Continuity Condition Arbitrary Boundary Condition Layerwise Theory Least-Squares Formulation

Cathode nanoarchitectonics with Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3): Overcoming the energy barriers of multielectron reactions for sodium-ion batteries

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Carbon Energy 2024年第9期6卷 1-14页

作者： Vaiyapuri Soundharrajan Sungjin Kim Subramanian Nithiananth Muhammad H.Alfaruqi JunJi Piao Duong Tung Pham Vinod mathew Sang A.Han Jung Ho Kim Jaekook Kim Department of Materials Science and Engineering Chonnam National UniversityBukguGwangjuRepublic of Korea Graduate School of Science and Technology Shizuoka UniversityHamamatsuShizuokaJapan Departemen Teknik Metalurgi Universitas Teknologi SumbawaSumbawaIndonesia School of Engineering Physics Hanoi University of Science and TechnologyHanoiVietnam Institute for Superconducting and Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongNorth WollongongNew South WalesAustralia Research Center for Artificial Intelligence Assisted Ionics Based Materials Development Platform Chonnam National UniversityGwangjuRepublic of Korea

High electrochemical stability and safety make Na+superionic conductor(NASICON)-class cathodes highly desirable for Na-ion batteries(SIBs).However,their practical capacity is limited,leading to low specific ***,the low electrical conductivity combined with a decline in capacity upon prolonged cycling(>1000 cycles)related to the loss of active material-carbon conducting contact regions contributes to moderate rate performance and cycling *** need for high specific energy cathodes that meet practical electrochemical requirements has prompted a search for new ***,we introduce a new carbon-coated Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3)(NVFTP/C)material as a promising candidate in the NASICON family of cathodes for *** a high specific energy of∼457 Wh kg^(-1) and a high Na+insertion voltage of 3.0 V versus Na^(+)/Na,this cathode can undergo a reversible single-phase solid-solution and two-phase(de)sodiation evolution at 28 C(1 C=174.7 mAh g^(-1))for up to 10,000 *** study highlights the potential of utilizing low-cost and highly efficient cathodes made from Earth-abundant and harmless materials(Fe and Ti)with enriched Na^(+)-storage properties in practical SIBs.

关键词： Fe and Ti swapping Na_(3)VFe_(0.5)Ti_(0.5)(PO_(4))_(3) prolonged cycle life structural stabilit

Socioeconomic Factors Influencing the Adoption of Cenchrus ciliaris among the Pastoralist Communities in South Baringo, Kenya

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Open Journal of Ecology 2024年第8期14卷 629-650页

作者： Nyambari Davis mathew Ogendi George Morara Atalitsa Caren Navalia Dryland Research Training & Ecotourism Centre Egerton University Kenya Directorate of Post-Graduate Studies Egerton University Kenya Department of Environmental Science Egerton University Kenya

Land degradation poses significant threats to food and environmental security globally. In arid and semi-arid lands (ASALs), livestock production is an important and significant livelihood. Unfortunately, overstocking and overgrazing have diminished pasture availability, and thus adversely impacting on the sector’s contribution to food security for many ASAL communities. The Global Environment Facility’s Small Grants Program in its quest to combat soil erosion, deforestation, and Prosopis juliflora invasion in the Lake Bogoria Landscape, Baringo County, Kenya has supported the establishment of Cenchrus ciliaris (buffel grass) since 2018. Despite its introduction and establishment, the socioeconomic factors influencing its adoption remain undocumented. This study evaluated these factors in three administrative wards, namely: Ilchamus, Mochongoi, and Marigat of Baringo South Sub-County. Data was collected from 103 households using a semi-structured questionnaire, key informant interviews (KIIs), and Focus Group Discussions (FGDs). Our results revealed that Cenchrus ciliaris adoption has partially reduced soil erosion and deforestation, improved livelihoods and environmental conservation. Nearly 50% of the respondents have established 2 to 5 acres of buffel grass pasturelands on their farms. The level of education of the respondents for had a significant association with the participants’ knowledge regarding the advantages of pasture production for environmental conservation (χ2 = 16.93;p χ2 = 77.71;p χ2 = 18.3;p χ2 = 3.8;p Cenchrus ciliaris value chain are recommended as practical strategies of enhancing livestock production and environmental conservation in Kenya’s ASALs.

关键词： Cenchrus ciliaris Pasture Ecology Conservation

Cerebral venous sinus thrombosis:changing trends in the incidence,age and gender(findings from the CMC Vellore CVT registry)

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Stroke & Vascular Neurology 2024年第3期9卷 252-257页

作者： Angel Miraclin T John Davis Prasad George Abraham Ninan Mahasampath Gowri Deepti Bal Atif Iqbal Ahmed Shaikh Rohit N Benjamin Appaswamy Thirumal Prabhakar Ajith Sivadasan Vivek mathew Sanjith Aaron Department of Neurological Sciences Christian Medical CollegeVelloreTamil NaduIndia Department of Biostatistics Christian Medical CollegeVelloreTamil NaduIndia

Background Multiple cerebral venous sinus thrombosis(CVT)registries from various geographical regions indicate that female gender,the use of contraceptive pills,pregnancy and puerperium are important risk *** this study,we report the changes in the epidemiology of patients with CVT managed over the past 26 *** The CMC Vellore CVT registry is a prospectively maintained database at the Christian Medical College,Vellore since January *** software was used to analyse the data and assess the changes in the incidence,age and gender distribution over the previous 26 *** Among 1701 patients treated during the study period,908(53%)were women and 793(47%)were *** mean incidence of CVT was 49 per 100000 admissions before 2010,which increased to 96 per 100000 after *** gender had a higher odds of developing CVT OR–2.07(CI 1.68 to 2.55,p<0.001).This could be attributed to the declining incidence of postpartum CVT after 2010 compared with the decade before 2010(50%vs 20%).The mean age at presentation had increased from 24.5 to 33.2 years in the last *** There was a clear change in the gender pattern from being a condition with female preponderance,to one where equal or more men are being *** incidence of postpartum CVT cases could be the driving *** increase in the overall incidence of CVT cases was noted,probably due to a higher index of clinical suspicion and better diagnostic imaging modalities.

关键词： CVT driving maintained