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Carbon nanotube-dependent synthesis of armchair graphene nanoribbons

Nano Research 2022年第3期15卷 1709-1714页

作者： Yifan Zhang Kecheng Cao Takeshi Saito Hiromichi Kataura Hans Kuzmany thomas pichler Ute Kaiser Guowei Yang Lei Shi State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterGuangzhou Key Laboratory of Flexible Electronic Materials and Wearable DevicesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Central Facility for Electron Microscopy Electron Microscopy Group of Materials ScienceUlm UniversityUlm 89081Germany School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Nanomaterials Research Institute National Institute of Advanced Industrial Science and TechnologyTsukuba 305-8565Japan Faculty of Physics University of ViennaVienna 1090-AAustria

Sub-nanometer armchair graphene nanoribbons(GNRs)with moderate band gap have great potential towards novel *** can be synthesized in the confined tubular space of single-walled carbon nanotubes(SWCNTs),in which precursor molecules have been specifically designed to form the GNRs with certain width and ***,it is still unexplored how the diameter and metallicity of SWCNTs influence the synthesis of the ***,we applied a series of SWCNTs with different average diameters to study the diameter-dependent synthesis of *** using Raman spectroscopy and transmission electron microscopy,we found that the width of the GNRs can be tailored by the diameter of the ***,the SWCNTs with average diameter of 1.3 nm produced 6 and 7 armchair GNRs with the highest yield,which can be well explained by considering the width of the GNRs and van der Waals radius of hydrogen and carbon *** addition,semiconducting and metallic SWCNTs produced GNRs with different yields,which could attribute to different diameter distributions and density of *** results enable the possibility of a high-yield production of certain armchair graphene nanoribbons in large scale,which would benefit future applications as semiconductor with sub-nanometer in width.

关键词： armchair graphene nanoribbons single-walled carbon nanotubes Raman spectroscopy diameter dependence metallicity dependence

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利用共振拉曼光谱确定一维碳链的光学带隙

利用共振拉曼光谱确定一维碳链的光学带隙

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第二十届全国光散射学术会议（CNCLS20）

作者：石磊 thomas pichler 中山大学维也纳大学

碳链是一种sp轨道杂化的新型碳的同素异形体,具有直接带隙,并且其带隙随着长度增加而减少;当长度达到几纳米时即表现出半导体的行为。由于碳链具有特殊的原子宽度的一维结构,其稳定性很差,所以一般需要利用化学官能团来稳定碳链。近期,... 详细信息

碳链是一种sp轨道杂化的新型碳的同素异形体,具有直接带隙,并且其带隙随着长度增加而减少;当长度达到几纳米时即表现出半导体的行为。由于碳链具有特殊的原子宽度的一维结构,其稳定性很差,所以一般需要利用化学官能团来稳定碳链。近期,我们利用碳纳米管为模板来制备并保护一维碳链,其长度分布从几纳米到几百纳米,创造了一维碳链的长度世界纪录【1】。为了研究不同长度的一维碳链的光学带隙,我们利用可调激光波长来测试不同长度碳链的共振拉曼光谱,从而得到了不同长度一维碳链的光学带隙的大小【2】。我们还发现,一维碳链的拉曼光谱频率和其光学带隙呈线性关系,并且斜率和碳链的周围环境无关,因此未来对于未知的不同形式的碳链,都可以通过测试其拉曼光谱,并利用这种线性关系,从而较为准确地确定其光学带隙。此外,利用共振拉曼光谱来得到一维碳链的基态和激光态之间的偏移及其振动能阶的确定【3】。

关键词：拉曼光谱一维碳链带隙

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Tuning beneficial calcineurin phosphatase activation to counterα-synuclein toxicity in a yeast model of Parkinson’s disease

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Neural Regeneration Research 2025年第1期20卷 199-200页

作者： Srishti Chawla Mikael Molin thomas Nystrom Institute for Biomedicine Sahlgrenska AcademyCentre for Ageing and Health-AgeCapUniversity of GothenburgGothenburgSweden Department of Life Sciences Chalmers University of TechnologyGothenburgSweden

Calcineurin(CN)is a calcium-and calmodulindependent serine/threonine that has been studied in many model organisms including yeast,filamentous fungi,plants,and *** biological functions range from ion homeostasis and virulence in lower eukaryotes to T-cell activation in humans by human nuclear factors of activated *** is a heterodimeric protein consisting of a catalytic subunit,calcineurin A(Cna1p),which contains an active site with a dinuclear metal center,and a regulatory Ca^(2+) binding subunit called calcineurin B(Cnb1p)required to activate *** calcineurin B subunit has been highly conserved through evolution:For example,the mammalian calcineurin B shows 54%identity with calcineurin B from Saccharomyces cerevisiae.

关键词： activation dinuclear conserved

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Microglia:a promising therapeutic target in spinal cord injury

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Neural Regeneration Research 2025年第2期20卷 454-463页

作者： Xiaowei Zha Guoli Zheng thomas Skutella Karl Kiening Andreas Unterberg Alexander Younsi Department of Neurosurgery Heidelberg University HospitalHeidelbergGermany Department of Neuroanatomy Institute for Anatomy and Cell BiologyHeidelberg UniversityHeidelbergGermany

Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal *** a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal *** this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor *** a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive *** review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.

关键词： astrocytes cytokines functional recovery immune regulation M1/M2 activation macrophages microglia neuroinflammation spinal cord injury therapy

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Pancreatitis, panniculitis and polyarthritis syndrome: A case report

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World Journal of Clinical Cases 2023年第18期11卷 4412-4418页

作者： Hannes pichler thomas Stumpner Dietmar Schiller Martin Bischofreiter Reinhold Ortmaier Department of Orthopedic Surgery Ordensklinikum Linz Barmherzige SchwesternVinzenzgruppe Center of Orthopedic ExcellenceTeaching HospitalParacelsus Medical University SalzburgLinz 4010Austria Department of Gastroenterology Ordensklinikum Linz Barmherzige SchwesternLinz 4010Austria

BACKGROUND Pancreatitis,panniculitis,and polyarthritis(PPP)syndrome is a rare form of pancreatic *** is characterized by bullous erythematous skin lesions and arthritis,and both are triggered by pancreatic *** cases have been described in the literature thus *** to the inconsistency in its clinical presentation,its diagnosis can be a *** therapy initiation is essential to reduce mortality;however,there is currently no gold standard for *** SUMMARY A 66-year-old polymorbid male patient presented with several superficial abscesses on both lower legs and painful swelling in the *** for septic arthritis and septic skin infection over several weeks *** general condition deteriorated gradually and worsened with sudden onset of abdominal pain.A diagnosis of necrotizing pancreatitis was *** subsequently underwent a laparotomy and drainage of the ***,our patient improved,and his abdominal complaints,knee pain,and dermal lesions *** PPP syndrome is rare and easily misdiagnosed,as abdominal symptoms may be delayed or *** should consider PPP syndrome if they encounter refractory panniculitis in combination with joint infection.

关键词： Pancreatitis Panniculitis Polyarthritis Pancreatitis,panniculitis,and polyarthritis syndrome Septic arthritis Case report

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Sleep as a window to understand and regulate Alzheimer's disease:emerging roles of thalamic reticular nucleus

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Neural Regeneration Research 2025年第6期20卷 1711-1712页

作者： Haoqi Sun Shiqian Shen Robert J.thomas M.Brandon Westover Can Zhang Department of Neurology Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Center for Translational Pain Research Department of AnesthesiaCritical Care and Pain MedicineMassachusetis General HospitalHarvard Medical SchoolBostonMAUSA Division of Pulmonary Critical Care and Sleep MedicineDepartment of MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Genetics and Aging Research Unit McCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolBostonMAUSA

Introduction:Alzheimer 's disease(AD) is a common neurodegenerative disorder and the primary cause of dementia. Considerable evidence supports the “amyloid hypothesis,” stating that the pathogenesis of AD is primarily caused by the deposition of amyloid-β(Aβ), which drives tau phosphorylation, neuroinflammation, and neurodegeneration in the brain. The amyloid hypothesis is strengthened by the significant and moderate benefit of lecanemab, a humanized antibody through an anti-amyloid mechanism,showing slowed clinical decline(van Dyck et al.,2023). The recent positive results of anti-amyloid trials have brought back focus on the amyloid hypothesis through biochemical, genetic, and pharmacological approaches(Zhang, 2023).

关键词： Alzheimer inflammation hypothesis

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Development of German-Ukrainian cooperations for education and research in photogrammetry and laser scanning

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Geo-Spatial Information Science 2021年第1期24卷 152-159,I0016页

作者： thomas Luhmann Institute for Applied Sciences and Geoinformatics Jade University of Applied Sciences OldenburgOldenburgGermany

Since 2011 an intensive international cooperation has been in place between the Institute for Applied Photogrammetry and Geoinformatics(IAPG)at the Jade University of Applied Sciences in Oldenburg,Germany,and various Ukrainian *** an initial contact by *** Konecny,the first visit was organized,and was followed by many *** subsequent years an intensive cooperation was established particularly with the National University for Construction and Architecture(KNUCA)in *** addition to architects and civil engineers,KNUCA also trains geodesists,geo-information scientists and landscape *** cooperation today includes the reciprocal exchange of scientists and students,research projects,courses and cooperation at many other *** addition,a commercial company has been established,SPM3D LLC,which now employs more than 14 engineers in the field of 3D acquisition,point cloud processing and *** article summarizes the history of the cooperation and presents the results of associated student *** addition,results of joint work on the development of a virtual laser scanner are presented,part of a German-Ukrainian initiative to digitize teaching.

关键词： Internationalization technology transfer curricula reform photogrammetry laser scanning e-learning

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Magnetohydrostatic modeling of the solar atmosphere

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Science China(Technological Sciences) 2022年第8期65卷 1710-1726页

作者： ZHU XiaoShuai NEUKIRCH thomas WIEGELMANN thomas State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Mathematics and Statistics University of St AndrewsSt Andrews KY169SSUK Max-Planck-Institut f¨ur Sonnensystemforschung G¨ottingen 37077Germany

Understanding structures and evolutions of the magnetic fields and plasma in multiple layers on the Sun is very important. A force-free magnetic field which is an accurate approximation of the solar corona due to the low plasma β has been widely studied and used to model the coronal magnetic structure. While the force-freeness assumption is well satisfied in the solar corona, the lower atmosphere is not force-free given the high plasma β. Therefore, a magnetohydrostatic(MHS) equilibrium which takes into account plasma forces, such as pressure gradient and gravitational force, is considered to be more appropriate to describe the lower atmosphere. This paper reviews both analytical and numerical extrapolation methods based on the MHS assumption for calculating the magnetic fields and plasma in the solar atmosphere from measured magnetograms.

关键词： magnetic field photosphere chromosphere corona

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Thermal Diffusivity Measurement of Glass at High Temperature by Using Flash Method

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Journal of Thermal Science 2004年第1期13卷 91-96页

作者： thomas Kabayabaya Department of Energy Engineering School of Mechanical EngineeringUniversity of Science and TechnologyBeijing 100083China

A measurement of the thermal diffusivity of a semi-transparent material (glass) by means of the 'Flash Method' is investigated in the present work. By taking into account the heat losses on the two faces of the sample, and using a new experimental technique design, an improvement of the determination of the thermal diffusivity of the semi-transparent material (glass) at high temperature is realized. The experimental design presented here is an original technical concept that enables a significant reduction in heat loss during the experiments. A very simple model based on the quadrupole method is used to theoretically determine the thermal diffusivity of the semi-transparent material by taking into account both conduction and radiation. Theoretical results clarify the effect of the absorption coefficient and the thickness of the sample on the heat transfer in the semi-transparent medium.

关键词： thermal diffusivity measurement techniques thermal conductivity radiative heat transfer phonic diffusivity heat conduction.

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Observing quantum coherence from photons scattered in free-space

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Light(Science & Applications) 2021年第7期10卷 1304-1312页

作者： Shihan Sajeed thomas Jennewein Institute for Quantum Computing University of WaterlooWaterlooON N2L 3G1Canada Department of Physics and Astronomy University of WaterlooWaterlooON N2L 3G1Canada

Quantum channels in free-space,an essential prerequisite for fundamental tests of quantum mechanics and quantum technologies in open space,have so far been based on direct line-of-sight because the predominant approaches for photon-encoding,including polarization and spatial modes,are not compatible with randomly scattered *** we demonstrate a novel approach to transfer and recover quantum coherence from scattered,non-line-of-sight photons analyzed in a multimode and imaging interferometer for time-bins,combined with photon detection based on a 8×8 *** observed time-bin visibility for scattered photons remained at a high 95%over a wide scattering angle range of−45^(0) to+45^(0),while the individual pixels in the detector array resolve or track an image in its field of view of ca.0.5°.Using our method,we demonstrate the viability of two novel ***,using scattered photons as an indirect channel for quantum communication thereby enabling non-line-of-sight quantum communication with background suppression,and secondly,using the combined arrival time and quantum coherence to enhance the contrast of low-light imaging and laser ranging under high background *** believe our method will instigate new lines for research and development on applying photon coherence from scattered signals to quantum sensing,imaging,and communication in free-space environments.

关键词： scattered quantum photons

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