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Recent progress on biodeterioration and protection of Cultural Heritage: a conference report of the 2 nd international symposium held in Dunhuang, China

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International Biodeterioration & Biodegradation 2025年

作者： Yuxin Chen Ji-Dong Gu Huyuan Feng Clara Enza Urzì Fasi Wu National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites Conservation Institute Dunhuang Academy Dunhuang 736200 PR China Key Scientific Research Base for Conservation of Ancient Wall Paintings of National Cultural Heritage Administration Dunhuang 736200 PR China MOE Key Laboratory of Cell Activities and Stress Adaptations Lanzhou University Lanzhou 730000 PR China Environmental Science and Engineering Group Guangdong Technion - Israel Institute of Technology 515063 Shantou PR China Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion - Israel Institute of Technology Shantou 515063 PR China Department of Chemical Biological Pharmaceutical and Environmental Sciences University of Messina Messina Italy

The 2 nd International Symposium on Biodeterioration and Protection of Cultural Heritage (Dunhuang, P.R. China, 2024), organized jointly by Dunhuang Academy, Lanzhou University, Guangdong Technion-Israel Institute of Technology, and International Biodegradation and Biodegradation Society, was held successfully at the renowned Mogao Grottoes on June 20–23, 2024, in Dunhuang of China. This symposium was with an aim to boost and bolster the scientific development and technical progress on biodeterioration and protection in Cultural Heritage conservation, and also promote scientific collaborations among different interested groups crossing boundary of countries and subject areas. It attracted more than 100 experts and scholars from 6 countries, 26 universities and institutes, and 16 cultural and museological units attended this symposium. New cutting-edge achievements and technologies in the field of Cultural Heritage biodeterioration and conservation were shared by the participants during the regular sessions and social hours. The conference themes include microbiome, mechanisms of biodeterioration, new methods and applications for monitoring and biodeterioration research, and bioprotection techniques emerged for restoration and conservation of cultural relics. Cultural Heritage materials of both inorganic and organic in nature were also presented. In addition, challenges and problems raised, and future research trends of this field were proposed and discussed on the symposium.

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How the Length of Through-Space Conjugation Influences the Clusteroluminescence of Oligo(Phenylene Methylene)s

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Angewandte Chemie 2024年第8期136卷

作者： Dr. Lei Wang Zuping Xiong Prof. Jing Zhi Sun Prof. Feihe Huang Prof. Haoke Zhang Prof. Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310058 China Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 311215 China Centre of Healthcare Materials Shaoxing Institute Zhejiang University Shaoxing 312000 China Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310058 China School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen (CUHK-Shenzhen) Guangdong 518172 China

The length and mode of conjugation directly affect the molecular electronic structure, which has been extensively studied in through-bond conjugation (TBC) systems. Corresponding research greatly promotes the development of TBC-based luminophores. However, how the length and mode of through-space conjugation (TSC), one kind of weak interaction, influence the photophysical properties of non-conjugated luminophores remains a relatively unexplored field. Here, we unveil a non-linear relationship between TSC length and emission characteristics in non-conjugated systems, in contrast to the reported proportional correlation in TBC systems. More specifically, oligo(phenylene methylene)s (OPM[4]-OPM[7]) exhibit stronger TSC and prominent blue clusteroluminescence (CL) (≈440 nm) compared to shorter counterparts (OPM[2] and OPM[3]). OPM[6] demonstrates the highest solid-state quantum yield (40 %), emphasizing the importance of balancing flexibility and rigidity. Further theoretical calculations confirmed that CL of these oligo(phenylene methylene)s was determined by stable TSC derived from the inner rigid Diphenylmethane (DPM) segments within the oligomers instead of the outer ones. This discovery challenges previous assumptions and adds a new dimension to the understanding of TSC-based luminophores in non-conjugated systems.

关键词： Aggregation-Induced Emission Clusteroluminescence Oligo(Phenylene Methylene)s Through-Space Conjugation

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Pillararene-Induced Intramolecular Through-Space Charge Transfer and Single-Molecule White-Light Emission

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Angewandte Chemie 2022年第19期134卷

作者： Qi Li Yitao Wu Jiajun Cao Yang Liu Zeju Wang Dr. Huangtianzhi Zhu Prof. Haoke Zhang Prof. Feihe Huang State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 China Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450001 China

The fabrication of single-molecule white-light emission (SMWLE) materials has become a highly studied topic in recent years and through-space charge transfer (TSCT) is emerging as an important concept in this field. However, the preparation of ideal TSCT-based SMWLE materials is still a big challenge. Herein, we report a bifunctional pillar[5]arene ( TPCN-P5-TPA ) with a linear donor-spacer-acceptor structure and aggregation-induced emission (AIE) property. The bulky pillar[5]arene between the donor and acceptor induces a twisted conformation and a non-conjugated structure, resulting in intramolecular TSCT. In addition, the AIE feature and pillar[5]arene cavity endow TPCN-P5-TPA with responsiveness to viscosity and polar guests, by which the TSCT emission is triggered. The combination of blue locally-excited state emission and yellow TSCT emission of TPCN-P5-TPA generates SMWLE. Therefore, we provide a new and versatile strategy for the construction of TSCT-based SMWLE materials.

关键词： Donor–Acceptor Systems Pillararenes Supramolecular Chemistry Through-Space Charge Transfer White-Light Emission

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Efficient Learning of Continuous-Variable Quantum States

arXiv

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arXiv 2023年

作者： Wu, Ya-Dong Zhu, Yan Chiribella, Giulio Liu, Nana John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai200240 China QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Department of Computer Science Parks Road OxfordOX1 3QD United Kingdom Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Institute of Natural Sciences Shanghai Jiao Tong University Shanghai200240 China Ministry of Education Key Laboratory in Scientific and Engineering Computing Shanghai Jiao Tong University Shanghai200240 China School of Mathematical Sciences Shanghai Jiao Tong University Shanghai200240 China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai200240 China

The characterization of continuous-variable quantum states is crucial for applications in quantum communication, sensing, simulation and computing. However, a full characterization of multimode quantum states requires a number of experiments that grows exponentially with the number of modes. Here we propose an alternative approach where the goal is not to reconstruct the full quantum state, but rather to estimate its characteristic function at a given set of points. For multimode states with reflection symmetry, we show that the characteristic function at M points can be estimated using only O(log M) copies of the state, independently of the number of modes. When the characteristic function is known to be positive, as in the case of squeezed vacuum states, the estimation is achieved by an experimentally friendly setup using only beamsplitters and homodyne measurements. © 2023, CC BY-NC-SA.

关键词： Quantum communication

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OBSERVABLE SETS, POTENTIALS AND SCHRÖDINGER EQUATIONS

arXiv

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arXiv 2020年

作者： Huang, Shanlin Wang, Gengsheng Wang, Ming School of Mathematics and Statistics Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China Center for Applied Mathematics Tianjin University Tianjin300072 China School of Mathematics and Physics China University of Geosciences Wuhan430074 China

We characterize observable sets for 1-dim Schrödinger equations in R: i∂tu = (−∂2x + x2m)u (with m ∈ N:= {0, 1, . . . }). More precisely, we obtain what follows: First, when m = 0, E ⊂ R is an observable set at some time if and only if it is thick, namely, there is γ > 0 and L > 0 so that E \ [x, x + L] ≥ γL for each x ∈ R;Second, when m = 1 (m ≥ 2 resp.), E is an observable set at some time (at any time resp.) if and only if it is weakly thick, namely lim |E T[−x, x]| > 0. x x→+∞ From these, we see how potentials x2m affect the observability (including the geometric structures of observable sets and the minimal observable time). Besides, we obtain several supplemental theorems for the above results, in particular, we find that a half line is an observable set at time T > 0 for the above equation with m = 1 if and only if T > π2 .MSC Codes 93B07, 35J10 Copyright © 2020, The Authors. All rights reserved.

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Boundary-Induced Topological Chiral Extended States in Weyl Metamaterial Waveguides

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Physical Review Letters 2025年第19期134卷 196601-196601页

作者： Ning Han Fujia Chen Mingzhu Li Rui Zhao Wenhao Li Qiaolu Chen Li Zhang Yuang Pan Yuze Hu Mingyu Tong Lu Qi Jingwen Ma Zhi-Ming Yu Hongsheng Chen Yihao Yang State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China College of Optical and Electronic Technology China Jiliang University Hangzhou 310018 China School of Information and Electrical Engineering Hangzhou City University Hangzhou 310015 China School of Physical Science and Technology Yangzhou University Yangzhou 225002 China Faculties of Science and Engineering The University of Hong Kong Hong Kong China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China

In topological physics, it is commonly understood that the existence of the boundary states of a topological system is inherently dictated by its bulk. A classic example is that the surface Fermi-arc states of a Weyl system are determined by the chiral charges of Weyl points within the bulk. Contrasting with this established perspective, here, we theoretically and experimentally discover a family of topological chiral bulk states extending over photonic Weyl metamaterial waveguides, solely induced by the waveguide boundaries, independently of the waveguide width. Notably, these chiral bulk states showcase discrete momenta and function as tunnels that connect Fermi-arc surface states living in different two-dimensional spaces via a third dimension. Our work offers an alternative mechanism for robust chiral bulk transport of waves and highlights the boundaries as a new degree of freedom to regulate bulk Weyl quasiparticles.

关键词： Degrees of freedom (mechanics)

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Characterizations of stabilizable sets for some parabolic equations in Rn

arXiv

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arXiv 2020年

We consider the parabolic type equation in Rn: (∂t + H)y(t, x) = 0, (t, x) ∈ (0, ∞) × Rn;y(0, x) ∈ L2(Rn), (0.1) where H can be one of the following operators: (i) a shifted fractional Laplacian;(ii) a shifted Hermite operator;(iii) the Schrödinger operator with some general potentials. We call a subset E ⊂ Rn as a stabilizable set for (0.1), if there is a linear bounded operator K on L2(Rn) so that the semigroup {e−t(H−χEK)}t≥0 is exponentially stable. (Here, χE denotes the characteristic function of E, which is treated as a linear operator on L2(Rn).) This paper presents different geometric characterizations of the stabilizable sets for (0.1) with different H. In particular, when H is a shifted fractional Laplacian, E ⊂ Rn is a stabilizable set for (0.1) if and only if E ⊂ Rn is a thick set, while when H is a shifted Hermite operator, E ⊂ Rn is a stabilizable set for (0.1) if and only if E ⊂ Rn is a set of positive measure. Our results, together with the results on the observable sets for (0.1) obtained in [1, 18, 24, 32], reveal such phenomena: for some H, the class of stabilizable sets contains strictly the class of observable sets, while for some other H, the classes of stabilizable sets and observable sets coincide. Besides, this paper gives some sufficient conditions on the stabilizable sets for (0.1) where H is the Schrödinger operator with some general potentials. Copyright © 2020, The Authors. All rights reserved.

关键词： Partial differential equations

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The non-cutoff Vlasov-Maxwell-Boltzmann system with weak angular singularity

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Science China Mathematics 2018年第1期61卷 111-136页

作者： Yingzhe Fan Yuanjie Lei Shuangqian Liu Huijiang Zhao School of Mathematics and Statistics Wuhan University School of Mathematics and Statistics Huazhong University of Science and Technology Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Department of Mathematics Jinan University Computational Science Hubei Key Laboratory Wuhan University

We establish the global existence of small-amplitude solutions near a global Maxwellian to the Cauchy problem of the Vlasov-Maxwell-Boltzmann system for non-cutoff soft potentials with weak angular singularity. This extends the work of Duan et al.(2013), in which the case of strong angular singularity is considered, to the case of weak angular singularity.

关键词： non-cutoff Vlasov-Maxwell-Boltzmann system global solutions near Maxwellians weak angular singularity time-velocity weighted energy method

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The Quantum Internet (Technical Version)

arXiv

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arXiv 2025年

作者： Rohde, Peter P. Huang, Zixin Ouyang, Yingkai Huang, He-Liang Su, Zu-En Devitt, Simon Ramakrishnan, Rohit Mantri, Atul Tan, Si-Hui Liu, Nana Harrison, Scott Radhakrishnan, Chandrashekar Brennen, Gavin K. Baragiola, Ben Q. Dowling, Jonathan P. Byrnes, Tim Munro, William J. Centre for Quantum Software and Information Faculty of Engineering and Information Technology University of Technology Sydney SydneyNSW Australia Hearne Institute for Theoretical Physics Louisiana State University Baton Rouge United States School of Mathematical and Physical Sciences Macquarie University NSW2109 Australia School of Mathematical and Physical Sciences University of Sheffield SheffieldS3 7RH United Kingdom Henan Key Laboratory of Quantum Information and Cryptography Henan Zhengzhou450000 China Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science & Technology of China Hefei China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information & Quantum Physics University of Science & Technology of China Hefei China CAS-Alibaba Quantum Computing Laboratory Shanghai China InstituteQ Aalto University Espoo02150 Finland Indian Institute of Science Bangalore India Singapore University of Technology & Design Singapore Centre for Quantum Technologies National University of Singapore Singapore Horizon Quantum Ireland 24 Fitzwilliam Place Dublin 2 D02 T296 Ireland Institute of Natural Sciences Shanghai Jiao Tong University Shanghai200240 China School of Mathematical Sciences Shanghai Jiao Tong University Shanghai200240 China Ministry of Education Key Laboratory in Scientific and Engineering Computing Shanghai Jiao Tong University Shanghai200240 China Shanghai Artificial Intelligence Laboratory Shanghai China University of Michigan Shanghai Jiao Tong University Joint Institute Shanghai200240 China Leibniz Institute for Research & Information in Education Frankfurt am Main Germany Department of Computer Science and Engineering NYU Shanghai 567 West Yangsi Road Shanghai200124 China Centre of Excellence in Engineered Quantum Systems Macquarie University NSW Australia Centre for Quantum Computation and Communication Technology School of Science RMIT University VIC

The desire to share and unite remote digital assets motivated the development of the classical internet, the enabler of the entire 21st century economy and our modern way of life. As we enter the quantum era, it is to be expected there will be a similar demand for networking quantum assets, motivating a global quantum internet for bringing together the world's quantum resources, leveraging off their exponential trajectory in capability. We present models for quantum networking, how they might be applied in the future, and the implications they will have. Socially, economically, politically and geostrategically, the upcoming era of quantum supremacy will be as significant for the 21st century as the transistor was for the 20th. The inherently different scaling in the computational power of quantum computers fundamentally changes the dynamics of how they will operate in the future. Given their high expected initial cost, a client/server model for outsourcing computation will be essential for enabling the accessibility and proliferation of this technology, and ensuring its economic viability. We therefore anticipate the emergence of cloud quantum computing, a model for outsourcing quantum computations to the network. We argue that economic efficiency will mandate that all future quantum computers be united into a single global virtual quantum computer, offering exponentially more power to all network participants than if they were to keep their resources to themselves. This model for the allocation of computational resources is uniquely quantum, with no classical analogue, completely altering the economic landscape for the future of computation. Given the sensitivity of much of the data to which future quantum computers are going to foreseeably be applied, protocols for encrypted quantum computation will be essential - the outsourcing of computations that neither an eavesdropper nor even the server performing the computation can spy upon. This will enable new models fo

关键词： Outsourcing

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Emotion Recognition from Children Speech Signals Using Attention Based Time Series Deep Learning

Emotion Recognition from Children Speech Signals Using Atten...

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IEEE International Conference on Bioinformatics and Biomedicine

作者： Guitao Cao Yunming Tang Jiyu Sheng Wenming Cao Shanghai Key Laboratory of Trustworthy Computing and MOE Research Center for Software/Hardware Co-Design Engineering East China Normal University Shenzhen Key Laboratory of Media Security Shenzhen University

ISBN: (纸本)9781728118680

Children's emotions expression concentrates in the acoustic aspects such as the tones and timbres of the voice instead of the semantics, and there are a lot of lengthy fragments in their speech. This paper proposes an emotion recognition model using the time series deep learning technology, named attention based Bi-directional Long Short-Term Memory (CNN-BiLSTM) to extract the emotional features. After preprocessing the speech signal, the forty-dimensional Mel Frequency Cepstral Coefficients (MFCC) related parameters are extracted, including the dynamic and static features. And these frequency domain features are enhanced by convolutional neural networks (CNNs) as the emotional features of children's speech recognition. BiLSTM is used to solve the problem of poor performance of long-term dependent learning features, and attention mechanism is used for only a few frames contain emotional features in the children speech signal. Compared with the related speech emotion recognition models such as LSTM-CNN and 2D-CNN-LSTM, our proposed speech emotion recognition model improves the accuracy up to 71.6% on the FAU-AIBO children's speech emotion database.

关键词： Emotion Recognition Speech Signal Deep learning BiLSTM Attention Mechanism emotion recognition Voice Signal Speech Time series Mel frequency cepstral coefficient Emotions

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