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Electron–plasmon and electron–magnon scattering in ferromagnets from first principles by combining GW and GT self-energies

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npj Computational Materials 2021年第1期7卷 1619-1632页

作者： Dmitrii Nabok stefan Blügel Christoph Friedrich Peter Grünberg Institut and Institut for Advanced Simulation Forschungszentrum JülichJülich 52425Germany

This work combines two powerful self-energy techniques:the well-known GW method and a self-energy recently developed by us that describes renormalization effects caused by the scattering of electrons with magnons and Stoner *** GT selfenergy,which is fully k-dependent and contains infinitely many spin-flip ladder diagrams,was shown to have a profound impact on the electronic band structure of Fe,Co,and *** the present work,we refine the method by combining GT with the GW *** resulting GWT spectral functions exhibit strong lifetime effects and emergent dispersion *** are in an overall better agreement with experimental spectra than those obtained with GW or GT alone,even showing partial improvements over local-spin-density approximation dynamical mean-field *** performed analysis provides a basis for applying the GWT technique to a wider class of magnetic materials.

关键词： materials theory infinitely

Auxin Is Required for Valve Margin Patterning in Arabidopsis After All

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Molecular Plant 2016年第6期9卷 768-770页

作者： stefan de Folter Unidad de Genomica Avanzada (LANGEBIO) Centro de Investigaci6n y de Estudios Avanzados del Instituto Politecnico Nacional (CINVESTAV-IPN) Kin. 9.6 Ubramiento Norte Carretera Irapuato-Leon Irrapuato Guanajuato CP 36821 Mexico

Fruits are important as a nutritional source, but biologically more important are their seed protection and dispersal funcions. Dry fruits can be dehiscent and the process of opening of ripe fruits, or pod shattering, causes the seeds to be dispersed （Ferrandiz, 2002）. This process occurs in many crop species, for instance of members of the Brassicaceae family. Arabidopsis thaliana, the model plant species in the laboratory, belongs to this family and also presents pod shattering （Figure 1）. The Arabidopsis fruit is a silique, and before fertilization it is called a gynoecium or pistil. The gynoecium is formed by two carpels that are fused, and the replum is present at their margins and is connected to the septum that divides the silique inside. In between each valve-replum border, the valve margin or dehiscence zone is formed. When the fruit matures, a separation layer and a lignified cell layer are formed in the dehiscence zone. In addition, a lignified layer is formed in the valves, and when the mature fruit starts to desiccate, tension is created, which in association with the effect of middle lamella degrading enzymes in the separation layer, results in shattering of the fruit （Ferrandiz, 2002）. Research has led to the proposal of a model for the gene regulatory network that explains valve margin formation in Arabidopsis （e.g., Ch＆vez Montes et al., 2015）. Mutations in various members of this gene regulatory network result in indehiscent fruits, i.e., the fruit does not open or shatter. One of these genes is the bHLH transcription factor INDEHISCENT （IND）, which is necessary for the formation of the separation layer and the lignified cell layers （Liljegren et al., 2004）. IND has also been related to auxin, more precisely, to auxin distribution, important for gynoecium and fruit patterning （Sorefan et al., 2009; Girin et al., 2011）.

关键词： important Arabidopsis formed

Machine Learning for heat radiation modeling of bi-and polydisperse particle systems including walls

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Particuology 2023年第3期74卷 119-140页

作者： Josef Tausendschön Gero Stöckl stefan Radl Institute of Process and Particle Engineering Graz University of TechnologyInffeldgasse 13/III8010GrazAustria

We investigated the ability of four popular Machine Learning methods i.e.,Deep Neural Networks(DNNs),Random Forest-based regressors(RFRs),Extreme Gradient Boosting-based regressors(XGBs),and stacked ensembles of DNNs,to model the radiative heat transfer based on view factors in bi-and polydisperse particle beds including *** training and analyzing the predictive capability of each method,an adjustment of markers used in monodisperse systems,as well as an evaluation of new markers was *** the basis of our dataset that considers a wide range of particle radii ratios,system sizes,particle volume fractions,as well as different particle-species volume fractions,we found that(i)the addition of particle size information allows the transition from monodisperse to bi-and polydisperse beds,and(ii)the addition of particle volume fraction information as the fourth marker leads to very accurate *** terms of the overall performance,DNNs and RFRs should be preferred compared to the other two *** particle-particle view factors,DNN and RFR are on par,while for particle-wall the RFR is *** demonstrate that DNNs and RFRs can be built to meet or even exceed the prediction quality standards achieved in a monodisperse system.

关键词： Discrete element method(DEM) Heat radiation modeling Machine learning View factors Wall radiation Polydisperse particles

Interictal and Ictal MEG in presurgical evaluation for epilepsy surgery

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Acta Epileptologica 2020年第1期2卷 83-92页

作者： Hermann stefan stefan Rampp Department of Neurology-Biomagnetism University Hospital Erlangen6Schabachanlage91054 ErlangenGermany. Department of Neurosurgery University Hospital Erlangen6SchabachanlageErlangenGermany.

Although presurgical evaluation of patients with pharamacoresistent focal epilepsies provides essential information for successful epilepsy surgery,there is still a need for further *** of noninvasive electrophysiological recording and analysis techniques offer additional information based on interictal and ictal epileptic *** this review,we provide an overview on the application of ictal magnetoencephalography(MEG).The results of a literature research for published interictal/ictal MEG findings and experiences with own cases are demonstrated and *** MEG may provide added value in comparison to interictal *** results may be more focal and closer to the invasively determined seizure onset *** some patients without clear interictal findings,ictal MEG could provide correct *** recording and analysis techniques facilitate ictal ***,extended recording durations,movement and artifacts still represent practical *** MEG may provide added value regarding the localization of the seizure onset zone but depends on the selection of patients and the application of optimal analysis techniques.

关键词： Ictal MEG Interictal MEG Localization of epileptic activity Presurgical evaluation

Small Directed Strongly Regular Graphs

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Algebra Colloquium 2020年第1期27卷 11-30页

作者： stefan Gyurki Deparment of Mathematics and Descriptive Geometry Faculty of Civil Engineering Slovak University of Technology81005 BratislavaSlovakia

The goal of the present paper is to provide a gallery of small directed strongly regular *** each graph of order n≤12 and valency k 详细信息

The goal of the present paper is to provide a gallery of small directed strongly regular *** each graph of order n≤12 and valency k

关键词： directed strongly regular graphs Cayley graphs voltage assignments

Development and validation of a transient simulation model of a full-scale PCM embedded radiant chilled ceiling

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Building Simulation 2023年第6期16卷 813-829页

作者： Seyedmostafa Mousavi Behzad Rismanchi stefan Brey Lu Aye Renewable Energy and Energy Efficiency Group Department of Infrastructure EngineeringFaculty of Engineering and Information Technology(FEIT)The University of MelbourneMelbourneVIC3010Australia InvAus Pty Ltd. MelbourneVIC3000Australia

The recent significant rise in space cooling energy demand due to the massive use of air-conditioning systems has adversely changed buildings’energy use patterns *** updated energy technology perspectives highlight the need for innovative cooling systems to address this growing cooling *** change material embedded radiant chilled ceiling(PCM-RCC)has lately acquired popularity as they offer more efficient space cooling together with further demand-side *** advancements in PCM-RCC applications have increased the necessity for reliable simulation models to assist professionals in identifying improved designs and operating *** this study,a transient simulation model of PCM-RCC has been developed and validated using measured data in a full-scale test cabin equipped with newly developed PCM ceiling *** model,developed in the TRNSYS simulation studio,includes Type 399 that uses the Crank-Nicolson algorithm coupled with the enthalpy function to solve transient heat transfer in PCM ceiling *** developed model is validated in both free-running and active operation modes,and its quality is then evaluated using several validation *** results obtained in multiple operating scenarios confirm that the model simulates the transient behaviour of the PCM-RCC system with an accuracy within±10%.Aided by this validated model,which offers the user detailed flexibilities in the system design and its associated operating schemas,PCM-RCC’s potentials regarding peak load shifting,energy savings,and enhanced thermal comfort can be investigated more reliably.

关键词： phase change material(PCM) radiant cooling ceiling panel modelling and simulation validation

Quantitative spatiotemporal impact of dynamic population density changes on the COVID-19 pandemic in China’s mainland

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Geo-Spatial Information Science 2023年第4期26卷 642-663页

作者： Guangyuan Zhang stefan Poslad Yonglei Fan Xiaoping Rui IoT Laboratory School of Electronic Engineering and Computer ScienceQueen Mary University of LondonLondonUK School of Earth Sciences and Engineering Hohai UniversityNanjingChina

The coronavirus disease 2019(COVID-19)and its mutant viruses are still wreaking global havoc over the last two years,but the impact of human activity on the transmission of the pandemic is difficult to *** human dynamic spatiotemporal distribution can help in our understanding of how to mitigate COVID-19 spread,which can help in maintaining urban health within a county and between counties within a *** distribution can be computed using the Volunteered Geographic Information(VGI)of the citizens in conjunction with other variables,such as climatic conditions,and used to analyze how human’s daily density distribution quantitatively affects COVID-19 *** on the estimated population density,when the population density increases daily by 1 person/km^(2) in a county or prefectural-level administrative unit with an average size of 26,000 km^(2),the county would have an additional 3.6 confirmed cases and 0.054 death cases after 5 days,which is the illness onset time for a new COVID-19 *** 14 days,which is the maximum incubation period of the COVID-19 virus,there would be 5 new confirmed cases and 0.092 death ***,in neighboring regions,there can be 0.96 fewer people infected with COVID-19 on average per day as a result of strong intervention of local and neighboring *** primary innovation and contribution are that this is the first quantitative assessment of the impacts of dynamic population density on the COVID-19 ***,the direct and indirect effects of the impact are estimated using spatial panel *** models that control the unobserved factors improve the reliability of the estimation,as validated by random experiments and the use of the Baidu migration dataset.

关键词： COVID-19 Geographic Information Systems(GIS) panel data Spatial Durbin Model(SDM)

Hydrogen effect on the mechanical behaviour and microstructural features of a Fe-Mn-C twinning induced plasticity steel

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International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 835-846页

作者： Xiaofei Guo stefan Zaefferer Fady Archie Wolfgang Bleck Steel Institute RWTH Aachen UniversityIntze-str.1Aachen 52072Germany Max-Planck-Institut für Eisenforschung GmbH Max-Planck-Straße 1Düsseldorf 40237Germany NLMK Europe Eutelis-Platz 2Ratingen 40878Germany

The influences of hydrogen on the mechanical properties and the fracture behaviour of Fe-22Mn-0.6C twinning induced plasticity steel have been investigated by slow strain rate tests and fractographic *** steel showed high susceptibility to hydrogen embrittlement,which led to 62.9%and 74.2%reduction in engineering strain with 3.1 and 14.4 ppm diffusive hydrogen,*** fracture surfaces revealed a transition from ductile to brittle dominated fracture modes with the rising hydrogen *** underlying deformation and fracture mechanisms were further exploited by examining the hydrogen effects on the dislocation substructure,stacking fault probability,and twinning behaviour in pre-strained slow strain rate test specimens and notched tensile specimens using coupled electron channelling contrast imaging and electron backscatter diffraction *** results reveal that the addition of hydrogen promotes planar dislocation structures,earlier nucleation of stacking faults,and deformation twinning within those grains which have tensile axis orientations close to//rolling direction and//rolling *** developed twin lamellae result in strain localization and micro-voids at grain boundaries and eventually lead to grain boundary decohesion.

关键词： twinning induced plasticity steel hydrogen mechanical behaviour dislocation twinning electron channelling contrast imaging

A COMPARATIVE STUDY ON INVOLVEMENT OF tPA ACTIVITY IN OVULATION INDUCED BY hCG AND GnRH AGONIST IN HYPOPHYSECTOMIZED RATS

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Science China Chemistry 1991年第10期34卷 1215-1224页

作者：刘以训冯强 CAJANDER stefan Laboratory of Reproductive Biology and Department of Endocrinology Institute of Zoology Academia Sinica Beijing 100080 PRC Department of Pathology Ume UniversityS-90187UmeSweden

A GnRH agonist (5-50 μg) is capable of inducing ovulation in PMSG-primed hypophy-sectomized immature rats, as is the case in hCG-induced ovulation, but 2-4 h earlier than hCG. GnRH-induced ovulation is effectively blocked by the concomitant administration of the GnRH-antagonist which failed to interfere with hCG-induced ovulation, indicating that GnRH and its agonists do not share a receptor with LH/hCG. Like hCG, GnRH is also capable of inducing tissue type (tPA), but not urokinase type (uPA) PA. The plasminogen activator activity in ovarian homogenates and the granulosa and theca-interstitial cells increase in a time-dependent manner, reaching maximum levels just prior to ovulation. Similar to hCG, GnRH also increases tPA activity in cumulus-oocyte complexes in a time-dependent fashion.

关键词： hCG GnRH agonist hypophysectomized rat ovulation tPA.