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Classification of high-ordered topological nod.s.towards Moiré flat bands in twisted bilayers

science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 133-147页

作者： Fan Cui Congcong Le Qiang Zhang Xianxin Wu Jiangping Hu Ching-Kai chiu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China school of Physical sciences University of Chinese Academy of SciencesBeijing 100190China RIKEN Interd.s.iplinary Theoretical and Mathematical sciences(iTHEMs) Wako 351-0198Japan CAs Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Kavli Institute of Theoretical sciences University of Chinese Academy of SciencesBeijing 100190China New Cornerstone science Laboratory Beijing 100190China

At magic twisted angles,dirac cones in twisted bilayer graphene(TBG)can evolve into flat bands,serving as a critical playground for the study of strongly correlated *** chiral symmetry is introduced,rigorous mathematical proof confirms that the flat bands are locked at zero energy in the entire Moiré Brillouin zone(BZ).Yet,TBG is not the sole platform that exhibits this absolute band *** to this flatness phenomenon are topological nod.s.and their specific locations in the *** this study,considering twisted bilayer systems that preserve chiral symmetry,we classify various ordered topological nod.s.in base layers and all possible node locations across different ***,we constrain the node locations to rotational centers,such as Γ and M points,to ensure the interlayer coupling retains equal strength in all *** this classification as a foundation,we systematically identify the conditions under which Moiré flat bands ***,through the extension of holomorphic functions,we provide proof that flat bands are locked at zero energy,shedding light on the origin of the band ***,beyond dirac cones,numerous twisted bilayer nodal platforms can host flat bands with a degeneracy number of more than two,such as four-fold.s.x-fold,and *** multiplicity of degeneracy in flat bands might unveil more complex and enriched correlation physics.

关键词： twisted bilayer systems high-ordered topological nodes Moriéflat bands high degeneracy

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“If somebody Needed Help, I Went Over”: social Capital and Therapeutic Communities of Older Adult Farmers in British Columbia Floods

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International Journal of d.s.ster Risk science 2024年第2期15卷 290-301页

作者： Kyle Breen siyu Ru Luna Vandeweghe Jenna chiu Lindsay Heyland Haorui Wu school of social Work Dalhousie UniversityHalifaxNS B3H 1S2Canada

Older adults in d.s.ster contexts are often thought of as a passive, vulnerable population that lacks agency and capacities to cope in the aftermath. However, it can be argued that older adults may have underrecognized.s.rengths that can be utilized pre-, peri-, and post-d.s.ster. One of these strengths is older adults' unique social capital that stems from long-standing connections with other members of their respective communities. Using data from in-depth, semistructured interviews with farmers in British Columbia 3–11 months after the 2021 floods, this research explored the experiences of older adult farmers' recovery. The farmers d.s.ussed how they leveraged their social capital to aid in their recovery efforts from the flood event. By using their bonding social capital, older adult farmers transformed their existing, deep-rooted connections into post-d.s.ster assistance. This, in turn, generated the idea of the therapeutic community, helping community members cope in the aftermath. This research indicated the need to further examine how older adults in d.s.ster settings can be viewed as assets with community knowledge and.s.ills as opposed to solely as a vulnerable population.

关键词： British Columbia Flood d.s.ster Older adults Qualitative research social capital Therapeutic community

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Flexible ultra-thin super-resolution end.s.opy

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science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 171-172页

作者： George s.d.Gordon department of Electrical and Electronic Engineering University of NottinghamNottingham NG7 2RDUK

In recent years, multimode fiber(MMF) has become an important tool for high-resolution end.s.opic imaging in narrow channels(e.g., in the brain via needles or inside blood vessels) due to its high mode density and fine diameter, typically stacle to wid.s.read deployment in applications is that realistic perturbations, including bending, twisting and changes in temperature, cause unacceptable image degradation.

关键词： fiber resolution typically

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Generalized polynomial chaos expansion by reanalysis using static condensation based on substructuring

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 819-836页

作者： d.LEE s.CHANG J.LEE department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea school of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This paper presents a new computational method for forward uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and dependent random *** method consists of a generalized polynomial chaos expansion(GPCE)for statistical moment and reliability analyses associated with the stochastic output and a static reanalysis method to generate the input-output data *** the reanalysis,we employ substructuring for a structure to isolate its local regions that vary due to random *** allows for avoiding repeated computations of invariant substructures while generating the input-output data *** substructuring with static condensation further improves the computational efficiency of the reanalysis without losing ***,the GPCE with the static reanalysis method can achieve significant computational saving,thus mitigating the curse of dimensionality to some degree for UQ under high-dimensional *** numerical results obtained from a simple structure indicate that the proposed method for UQ produces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).We also demonstrate the efficiency and.s.alability of the proposed method by executing UQ for a large-scale wing-box structure under ten-dimensional(all-dependent)random inputs.

关键词： forward uncertainty quantification(UQ) generalized polynomial chaos expansion(GPCE) static reanalysis method static condensation substructuring

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Ion heat transport in electron cyclotron resonance heated L-mode plasma on the T-10 tokamak

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Plasma science and Technology 2024年第4期26卷 52-60页

作者： V.A.KRUPIN M.R.NURGALIEV A.R.NEMETs I.A.ZEMTsOV s.d.s.NTsOV T.B.MYALTON d.s.sERGEEV N.A.sOLOVEV d.V.sARYCHEV d.V.RYJAKOV s.N.TUGARINOV N.N.NAUMENKO National Research Centre“Kurchatov Institute” Moscow 123182Russia Bauman Moscow state Technical University Moscow 105005Russia Institution“Project Center ITER” Moscow 123098Russia JsC“sOLAR” Minsk 220034Belarus

Anomalous ion heat transport is analyzed in the T-10 tokamak plasma heated with electron cyclotron resonance heating(ECRH) in second-harmonic extra-ordinary mode. Predictive modeling with empirical scaling for Ohmical heat conductivity shows that in ECRH plasmas the calculated ion temperature could be overestimated, so an increase of anomalous ion heat transport is required. To study this effect two scans are presented: over the EC resonance position and over the ECRH power. The EC resonance position varies from the high-field.s.de to the low-field.s.de by variation of the toroidal magnetic field. The scan over the heating power is presented with on-axis and mixed ECRH regimes. d.s.harges with high anomalous ion heat transport are obtained in all considered regimes. In these d.s.harges the power balance ion heat conductivity exceeds the neoclassical level by up to 10 times. The high ion heat transport regimes are d.s.inguished by three parameters: the ratio Te/Ti, the normalized electron density gradient R/■, and the ion–ion collisionality νii~*. The combination of high Te/Ti, high νii~*, and R/■=6-10 results in values of normalized anomalous ion heat fluxes up to 10 times higher than in the low transport scenario.

关键词： tokamak L-mode electron cyclotron resonance heating ion heat transport

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Can You Help Me,Please?

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空中英语教室（初级版．大家说英语） 2024年第9期 35-38,54,55,56页

作者： Maria chiu 不详

Everyone needs help *** can ask,"Can you give me a hand?"Maybe you have to finish a *** need *** can ask,"Can you hand those scissors to me?"Or perhaps you need.s.me advice or want someone's *** you have to solve a **... 详细信息

关键词： something someone You

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Eating Hot Pot

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空中英语教室（初级版．大家说英语） 2024年第11期 17-20,52,56页

作者： Maria chiu 不详

Hot pot is a popular Chinese *** is delicious!You sit at a table with a pot of hot ***,the broth has to *** you can cook many different things in *** people put seafood and different kinds of meat in hot *** such as cabbage and corn are delicious in it,*** also add mushrooms,tofu and noodles to hot *** some cooked food from your hot pot with your *** it in some sauce and enjoy!

关键词： corn stick mushroom

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Cranberry sauce Recipe

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空中英语教室（初级版．大家说英语） 2024年第11期 27-29,53页

作者： Maria chiu 不详

Cranberry sauce Ingredients 1 cupsugar 1/2 cup orange juice 1/2cup water 4cups fresh orfrozen cranberries 1 piece of orange peel directions *** sugar,orange juice and water in a *** it boil.

关键词： orange sugar frozen

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Make a BOOKMARK

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空中英语教室（初级版．大家说英语） 2024年第7期 32-33,54页

作者： Maria chiu 不详

句中cardstock“卡纸”和paper“纸”都是不可数名词,所以用法如下:1.前面不可以加不定冠词a;colorful paper.2.I need paper for my printer.我的打印机需要纸。

关键词： printer 不可数名词打印机

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Make a Rock Photo Holder

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空中英语教室（初级版．大家说英语） 2024年第9期 26-27,53页

作者： Maria chiu 不详

一、拿一块光滑的石头和一些铁丝、颜料和画笔。二、用一种颜色为石头涂色,然后晾干。三、拿另一种颜色的颜料和另一支画笔。四、在石头上画出图案,然后晾干。五、用铁丝的一端缠在石头上。六、把铁丝的另一端在一支笔上绕几圈。

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