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Common microscopic origin of the phase transitions in Ta_(2)NiS_(5) and the excitonic insulator candidate Ta_(2)NiSe_(5)

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npj Computational Materials 2021年第1期7卷 1919-1932页

作者： Lukas Windgätter Malte Rösner Giacomo Mazza hannes Hübener Antoine Georges Andrew J.Millis Simone Latini Angel Rubio Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 14922761 HamburgGemany Radboud University Institute for Molecules and MaterialsHeijendaalseweg 1356525 AJ NijmegenNetherlands Department of Quantum Matter Physics University of GenevaQuai Ernest-Ansermet 241211 GenevaSwitzerland College de France 11 place Marcelin Berthelot75005 ParisFrance Center for Computational Quantum Physics Flatiron InstituteNew YorkNY 10010USA.CPHTCNRSEcole PolytechniqueIP Paris91128 PalaiseauFrance Department of Physics Columbia UniversityNew YorkNY 10027USA.Nano-Bio Spectroscopy Group Departamento de Fisica de Materiales Universidad del Pais Vasco20018 San SebastianSpain

The structural phase transition in Ta-NiSes has been envisioned as driven by the formation of an excitonic insulating ***,the role of structural and electronic instabilities on crystal symmetry breaking has yet to be ***,the phase transition in its complementary material Ta_(2)NiS_(5)does not show any experimental hints of an excitonic insulating *** present a microscopic investigation of the electronic and phononic effects involved in the structural phase transition in Ta_(2)NiSe_(5)and Ta-Niss using extensive first-principles *** both materials the crystal symmetries are broken by phonon instabilities,which in tum lead to changes in the electronic bandstructure also observed in the experiment.A total energy landscape analysis shows no tendency towards a purely electronic instability and we find that a sizeable lattice distortion is needed to open a *** conclude that an excitonic instability is not needed to explain the phase transition in both Ta_(2)NiSe_(5)and Ta_(2)NiS_(5).

关键词： phase structural transitions

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Continuous cooling precipitation diagram of cast aluminium alloy Al-7Si-0.3Mg

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2025-2033页

作者： Benjamin MILKEREIT hannes FRCK Christoph SCHICK Olaf KESSLER Chair of Materials Science Faculty of Mechanical Engineering and Marine TechnologyUniversity of Rostock Polymer-Physics Group Institute of Physics University of Rostock

The precipitation behaviour during quenching of cast Al-7Si-0.3Mg aluminium alloy was investigated by DSC in the cooling rate range of 0.01 K/s to 3 K/s and by quenching dilatometry for higher rates. Two main precipitation reactions were observed during cooling, a high temperature reaction starting almost directly with quenching from 540℃ and a low temperature reaction starting at about 400℃. Quenching with 3 K/s already significantly suppresses precipitation during quenching. Hardness after T6 ageing increases with increasing quenching rate, due to the increasing content of supersaturated solid solution. By dilatometry and hardness results the critical cooling rate can be estimated as about 60 K/s. Quenched Al-7Si-0.3Mg microstructures have been investigated by light microscopy. The microstructures consist of an aluminium-silicon eutectic structure, aluminium solid solution dendrites and precipitates inside the aluminium dendrites, depending on quenching rate.

关键词： cast aluminium alloy Al-7Si-0.3Mg quenching continuous cooling precipitation diagram differential scanningcalorimetry critical cooling rate

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New spatial dimensions of global cityscapes: From reviewing existing concepts to a conceptual spatial approach

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Journal of Geographical Sciences 2016年第3期26卷 355-380页

作者： GEORG Isabel BLASCHKE Thomas TAUBENB?CK hannes Department of Geoinformatics University of Salzburg Earth Observation Center (EOC) Remote Sensing Data Center (DFD)German Aerospace Center (DLR)

Current global urbanisation processes are leading to new forms of massive urban constellations. The conceptualisations and classifications of these, however, are often ambiguous, overlap or lag behind in scientific literature. This article examines whether there is a common denominator to define and delimitate–and ultimately map–these new dimensions of cityscapes. In an extensive literature review we analysed and juxtaposed some of the most common concepts such as megacity, megaregion or megalopolis. We observed that many concepts are abstract or unspecific, and for those concepts for which physical parameters exist, the parameters are neither properly defined nor used in standardised ways. While understandably concepts originate from various disciplines, the authors identify a need for more precise definition and use of parameters. We conclude that often, spatial patterns of large urban areas resemble each other considerably but the definitions vary so widely that these differences may surpass any inconsistencies in the spatial delimitation process. In other words, today we have tools such as earth observation data and Geographic Information Systems to parameterise if clear definitions are provided. This appears not to be the case. The limiting factor when delineating large urban areas seems to be a commonly agreed ontology.

关键词： urban concepts large urban areas conceptualization urbanization megacity metropolis ribbon development urban sprawl conurbation city region agglomeration megaregion urban corridor

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Nervous System 1 Har/Cdr

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丛书名： Cambridge Illustrated Surgical Pathology

2009年

作者： hannes Vogel

ISBN: (纸本)9780521881616

Nervous System is the new atlas-oriented resource in central nervous system pathology. As the fourth book in the Cambridge Illustrated Surgical Pathology series it is the most comprehensive text of methods utilized by pathologists to accurately diagnose diseases affecting the brain, meninges, and spinal cord. The book is a richly illustrated guide to surgical neuropathology, including all primary brain tumors as well as others arising near the nervous system that are also within the scope of neurosurgical practice. Numerous neuroimaging examples are provided to underscore the importance of knowing the basics of radiographic studies in accurately diagnosing CNS pathology. A complete spectrum of nonneoplastic neuropathological entities is also illustrated, including infectious, inflammatory, and epilepsy-related neuropathology. Additional chapters address intraoperative consultation and frozen sections, as well as CSF cytopathology.

关键词： surgical pathology illustrated cambridge system nervousAnatomy Basic Sciences Medical Professional & Technical

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The role of temperature‐enhanced fault closure in promoting postinjection pressure diffusion and seismicity in enhanced geothermal systems

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Deep Underground Science and Engineering 2023年第4期2卷 394-405页

作者： Yinlin Ji Yuedu Chen hannes Hofmann Yuan Zhang Arno Zang Günter Zimmermann Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences PotsdamGermany Key Laboratory of In‐situ Property‐improving Mining of Ministry of Education Taiyuan University of TechnologyTaiyuanChina Institute of Applied Geosciences Technische Universität BerlinBerlinGermany Key Laboratory of Deep Coal Resource Mining(CUMT) Ministry of EducationSchool of MinesChina University of Mining and TechnologyXuzhouChina

Post shut‐in seismic events in enhanced geothermal systems(EGSs)occur predominantly at the outer rim of the co‐injection seismic *** concept of postinjection fracture and fault closure near the injection well has been proposed and validated as a mechanism for enhancing post shut‐in pressure diffusion that promotes seismic *** phenomenon is primarily attributed to the poro‐elastic closure of fractures resulting from the reduction of wellbore pressure after injection ***,the thermal effects in EGSs,mainly including heat transfer and thermal stress,may not be trivial and their role in postinjection fault closure and pressure evolution needs to be *** this study,we performed numerical simulations to analyze the relative importance of poro‐elasticity,heat transfer,and thermo‐elasticity in promoting postinjection fault closure and pressure *** numerical model wasﬁrst validated against analytical solutions in terms ofﬂuid pressure diffusion and against heatedﬂow‐through experiments in terms of thermal *** then quantiﬁed and distinguished the contribution of each individual mechanism by comparing four different shut‐in scenarios simulated under different coupled *** results highlight the importance of poro‐elastic fault closure in promoting postinjection pressure buildup and seismicity,and suggest that heat transfer can further augment the fault closure‐induced pressure increase and thus potentially intensify the postinjection seismic hazard,with minimal contribution from thermo‐elasticity.

关键词： enhanced geothermal system(EGS) fault closure hydraulic stimulation postinjection seismicity thermal effects thermo‐poro‐elasticity

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Slowed driving-reaction time following concussion-symptom resolution

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Journal of Sport and Health Science 2021年第2期10卷 145-153页

作者： Landon B.Lempke Robert C.Lynall Nicole L.Hoffman hannes Devos Julianne D.Schmidt UGA Concussion Research Laboratory Department of KinesiologyUniversity of GeorgiaAthensGA 30602USA School of Kinesiology and Recreation Illinois State UniversityNormalIL 61790USA Laboratory for Advanced Rehabilitation Research in Simulation Department of Physical Therapy and Rehabilitation ScienceUniversity of Kansas Medical CenterKansas CityKS 66160USA

Background:Concussed patients have impaired reaction time(RT)and cognition following injury that may linger and impair driving *** research has used direct methods to assess driving-RT *** study compared driving RT during simulated scenarios between concussed and control individuals and examined driving-RT’s relationship with traditional computerized neurocognitive testing(CNT)***:We employed a cross-sectional study among 14 concussed(15.9±9.8 days post-concussion,mean±SD)individuals and 14 healthy controls matched for age,sex,and driving *** completed a driving simulator and CNT(CNS Vital Signs)assessment within 48 h of symptom resolution.A driving-RT composite(ms)was derived from 3 simulated driving scenarios:stoplight(green to yellow),evasion(avoiding approaching vehicle),and pedestrian(person running in front of vehicle).The CNT domains included verbal and visual memory;CNT-RT(simple-,complex-,Stroop-RT individually);simple and complex attention;motor,psychomotor,and processing speed;executive function;and cognitive *** t tests and Hedge d effect sizes assessed driving-RT differences between groups,Pearson correlations(r)examined driving RT and CNT domain relationships among cohorts separately,and p values were controlled for false discovery rate via Benjamini-Hochberg procedures(a=0.05).Results:Concussed participants demonstrated slower driving-RT composite scores than controls(mean difference=292.86 ms;95%confidence interval(95%CI):70.18515.54;p=0.023;d=0.992).Evasion-RT(p=0.054;d=0.806),pedestrian-RT(p=0.258;d=0.312),and stoplight-RT(p=0.292;d=0.585)outcomes were not statistically significant after false-discovery rate corrections but demonstrated medium to large effect sizes for concussed *** concussed individuals,driving-RT outcomes did not significantly correlate with CNT domains(r-range:0.51 to 0.55;p>0.05).No correlations existed between driving-RT outcomes a

关键词： Mild traumatic brain injury Motor vehicle Neurocognitive function Response time Return to driving

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Architecture and Software Design for a Service Robot in an Elderly-Care Scenario

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Engineering 2015年第1期1卷 27-35页

作者： Norman Hendrich hannes Bistry Jianwei Zhang Computer Science Department University of Hamburg

Systems for ambient assisted living(AAL) that integrate service robots with sensor networks and user monitoring can help elderly people with their daily activities, allowing them to stay in their homes and live active lives for as long as possible. In this paper, we outline the AAL system currently developed in the European project Robot-Era, and describe the engineering aspects and the serviceoriented software architecture of the domestic robot, a service robot with advanced manipulation capabilities. Based on the robot operating system(ROS) middleware, our software integrates a large set of advanced algorithms for navigation, perception, and manipulation. In tests with real end users, the performance and acceptability of the platform are evaluated.

关键词： service robots ambient assisted living manipulation and grasping user study

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Efficient,high-CRI white LEDs by combining traditional phosphors with cadmium-free InP/ZnSe red quantum dots

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Photonics Research 2022年第1期10卷 155-165页

作者： BEGA KARADZA hannes VAN AVERMAET LEILA MINGABUDINOVA ZEGER HENS YOURI MEURET KU Leuven Department of Electrical Engineering(ESAT)Light&Lighting LaboratoryGebroeders De Smetstraat 19000 GentBelgium Physics and Chemistry of Nanostructures and Center for Nano and Biophotonics Krijgslaan 281-S39000 GentBelgium

Quantum dots(QDs) offer an interesting alternative for traditional phosphors in on-chip light-emitting diode(LED) *** studies showed that the spectral efficiency of white LEDs with high color rendering index(CRI) values could be considerably improved by replacing red-emitting nitride phosphors with narrowband ***,the red QDs in these studies were cadmium-based,which is a restricted element in the EU and certain other *** use of InP-based QDs,the most promising Cd-free alternative,is often presented as an inferior solution because of the broader linewidth of these ***,while narrow emission lines are the key to display applications that require a large color gamut,the spectral efficiency penalty of this broader emission is limited for lighting ***,we report efficient,high-CRI white LEDs with an on-chip color converter coating based on red InP/ZnSe QDs and traditional green/yellow powder *** InP/ZnSe QDs with a quantum yield of nearly 80% and a full width at half-maximum of 45 nm,we demonstrate high spectral efficiency for white LEDs with very high CRI *** of the best experimental results in terms of both luminous efficacy and color rendering performance is a white LED with an efficacy of 132 lm/W,and color rendering indices of R_(a)≈90,R9 ≈50 for CCT ≈4000 *** experimental results are critically compared with theoretical benchmark values for white LEDs with on-chip downconversion from both phosphors and red Cd-based *** various loss mechanisms in the investigated white LEDs are quantified with an accurate simulation model,and the main impediments to an even higher efficacy are identified as the blue LED wall-plug Quantum dots(QDs) offer an interesting alternative for traditional phosphors in on-chip light-emitting diode(LED) *** studies showed that the spectral efficiency of white LEDs with high color rendering index(CRI) values could be considerably improved by re

关键词： phosphors white rendering

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科学进展:系统评价填补空白(英文)

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中国循证医学杂志 2007年第11期7卷 827-829页

作者： hannes Karin 吴泰相 Belgian Centre for Evidence-Based Medicine-Belgian Branch of the Cochrane Collaboration Kapucijnenvoer 33 blok J3000 Leuven Belgium 四川大学华西医院中国Cochrane中心成都610041

1993年,Cochrane协作网,一个旨在生产、更新和传播系统评价的国际性非赢利组织建立。几年后,即1999年,中国Cochrane中心在成都建立,其旨在对①有意做系统评价的研究者和②有意在日常实践中使用系统评价结果的决策者和实践者提供支持。... 详细信息

1993年,Cochrane协作网,一个旨在生产、更新和传播系统评价的国际性非赢利组织建立。几年后,即1999年,中国Cochrane中心在成都建立,其旨在对①有意做系统评价的研究者和②有意在日常实践中使用系统评价结果的决策者和实践者提供支持。我们检索了PubMed和中国Cochrane中心数据库,以获取在1990～2006年间以中文发表的论文和系统评价数据。虽然从2000年开始,系统评价大量增加,但其占从PubMed检索到的论文总数的比例仍然不高。

关键词：系统评价 Cochrane系统评价

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NOD2-and disease-specific gene expression profiles of peripheral blood mononuclear cells from Crohn's disease patients

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World Journal of Gastroenterology 2018年第11期24卷 1196-1205页

作者： Holger Schufler Maria Rohde Sarah Rohde Astrid Huth Nicole Gittel hannes Hollborn Dirk Koczan Ane Glass Georg Lamprecht Robert Jaster Department of Medicine II Division of GastroenterologyRostock University Medical CenterRostock 18057Germany Institute of Immunology Rostock University Medical CenterRostock 18057Germany Institute for Biostatistics and Informatics in Medicine and Ageing Research Rostock 18057Germany

AIM To investigate disease-specific gene expression profiles of peripheral blood mononuclear cells(PBMCs) from Crohn's disease(CD) patients in clinical *** Patients with CD in clinical remission or with very low disease activity according to the Crohn's disease activity index were genotyped regarding nucleotidebinding oligomerization domain 2(NOD2),and PBMCs from wild-type(WT)-NOD2 patients,patients with homozygous or heterozygous NOD2 mutations and healthy donors were isolated for further *** cells were cultured with vitamin D,peptidoglycan(PGN) and lipopolysaccharide(LPS) for defined periods of time before RNA was isolated and subjected to microarray analysis using Clariom S assays and quantitative realtime ***2-and disease-specific gene expression profiles were evaluated with repeated measure ANOVA by a general linear *** Employing microarray assays,a total of 267 genes were identified that were significantly up-or downregulated in PBMCs of WT-NOD2 patients,compared to healthy donors after challenge with vitamin D and/or a combination of LPS and PGN(P < 0.05;threshold:≥ 2-fold change).For further analysis by real-time PCR,genes with known impact on inflammation and immunity were selected that fulfilled predefined expression *** a larger cohort of patients and controls,a disease-associated expression pattern,with higher transcript levels in vitamin D-treated PBMCs from patients,was observed for three of these genes,CLEC5 A(P < 0.030),lysozyme(LYZ;P < 0.047) and TREM1(P < 0.023).Six genes were found to be expressed in a NOD2-dependent manner(CD101,P < 0.002;CLEC5 A,P < 0.020;CXCL5,P < 0.009;IL-24,P < 0.044;ITGB2,P < 0.041;LYZ,P < 0.042).Interestingly,the highest transcript levels were observed in patients with heterozygous NOD2 *** Our data identify CLEC5 A and LYZ as CD-and NOD2-associated genes of PBMCs and encourage further studies on their pathomechanistic roles.

关键词： Peripheral blood mononuclear cells Gene expression NOD2 Lysozyme Crohn's disease CLEC5A

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