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A review on evaluation of crack resistance of asphalt mixture by semi-circular bending test

Journal of Road Engineering 2023年第1期3卷 87-97页

作者： Yongjun Meng Weikang Kong Chaoliang Gou Shenwen Deng Yirong Hu Jing Chen Liupeng Fan School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education Guangxi UniversityNanning 530004China Special Geological Highway Safety Engineering Technology Research Center Guangxi UniversityNanning 530004China National High-performance Computing Center Nanning Branch Nanning 530004China

Although there are many kinds of fracture tests to choose from in evaluating the crack resistance of asphalt mixture,the semi-circular bending(SCB)test has attracted a lot of attention in the academic road engineering community because of its simplicity,stability,and flexibility in testing and *** SCB test has become a common method to study the cracking resistance of asphalt mixture in recent *** paper mainly summarizes the overview of the SCB test,summarizes some research results and common characterization parameters of the SCB test method in monotone test and fatigue test in recent years,and predicts and suggests the research direction of the SCB test in the *** is found that the research on the monotonic SCB test is more comprehensive,and the research on the SCB fatigue test needs to be further improved in the aspects of loading mode,characterization parameter selection,and so *** can flexibly adjust the geometric dimensions and the test parameters of semi-cylindrical specimens,and conduct comprehensive analysis combined with the results of numerical *** crack resistance of asphalt mixture can be comprehensively evaluated by fracture energy,fracture toughness,stiffness,flexibility index and other fracture indicators,combined with the crack propagation of the *** analysis of numerical simulation can confirm the test *** order to standardize the setting of fatigue parameters for future application,it is necessary to standardize the setting of bending performance.

关键词： Asphalt mixture Crack resistance Fatigue performance Semi-circular bending test

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Review of emulsified asphalt modification mechanisms and performance influencing factors

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Journal of Road Engineering 2023年第2期3卷 141-155页

作者： Yongjun Meng Jing Chen Weikang Kong Yirong Hu School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education Guangxi UniversityNanning 530004China Special Geological Highway Safety Engineering Technology Research Center Guangxi UniversityNanning 530004China National High-performance Computing Center Nanning Branch Nanning 530004China

In recent years,with the improvement of the requirements of road performance,modified emulsified asphalts with better performance has gradually replaced the emulsified asphalt and become the primary material for road *** paper introduces the modified emulsified asphalt materials commonly used in pavement maintenance projects,definitions and modified mechanisms of polymerized styrene butadiene rubber(SBR)modified emulsified asphalt,styrene butadiene styrene block polymer(SBS)modified emulsified asphalt and waterborne epoxy resin(WER)modified emulsified asphalt are *** analysis focused on comparing the effects of modifiers,preparation process,auxiliary additives,and other factors on the performance of modified emulsified *** this paper,it is considered that the greatest impact on the performance of emulsified asphalt is the modifier,emulsifier mainly affects the speed of breaking the emulsion,stabilizers on the basic performance of emulsified asphalt evaporative residue is small;and when the modifier is distributed in the asphalt in a network,the dosage at this time is the recommended optimum ***,this study recommends that in the future,the polymer-asphalt compatibility can be improved through composite modification,chemical grafting and other methods to continue to develop broader applicability and better performance of modified emulsified asphalt.

关键词： Modified emulsified asphalt performance Influencing factor Modification mechanism

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Artificial Boundary Conditions for Time-Fractional Telegraph Equation

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Numerical Mathematics(Theory,Methods and Applications) 2022年第2期15卷 360-386页

作者： Wang Kong Zhongyi Huang Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA) MIITNanjing 211106China Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China

In this paper,we study the numerical solution of the time-fractional telegraph equation on the unbounded *** first introduce the artificial boundariesГ±to get a finite computational *** the artificial boundariesГ±,we use the Laplace transform to construct the exact artificial boundary conditions(ABCs)to reduce the original problem to an initial-boundary value problem on a bounded *** addition,we propose a finite difference scheme based on the L_(1−2)formule for the Caputo fractional derivative in time direction and the central difference scheme for the spatial directional derivative to solve the reduced *** order to reduce the effect of unsmoothness of the solution at the initial moment,we use a fine mesh and low-order interpolation to discretize the solution near t=***,some numerical results show the efficiency and reliability of the ABCs and validate our theoretical results.

关键词： Artificial boundary conditions time-fractional telegraph equation finite difference scheme fractional Cattaneo heat conduction law

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Quantum frontiers in high energy physics

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Science China(Physics,Mechanics & Astronomy) 2025年第6期Mechanics & Astronomy) .卷 53-75页

作者： Yaquan Fang Christina Gao Ying-Ying Li Jing Shu Yusheng Wu Hongxi Xing Bin Xu Lailin Xu Chen Zhou Institute of High Energy Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Physics Southern University of Science and Technology Interdisciplinary Center for Theoretical Study University of Science and Technology of China Peng Huanwu Center for Fundamental Theory State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Center for High Energy Physics Peking University Beijing Laser Acceleration Innovation Center State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of China Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum MatterSouth China Normal University Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear ScienceSouthern Nuclear Science Computing Center South China Normal University Southern Center for Nuclear-Science Theory Institute of Modern Physics Chinese Academy of Sciences

Numerous challenges persist in high energy physics(HEP), the addressing of which requires advancements in detection technology, computational methods, data analysis frameworks, and phenomenological designs. We provide a concise yet comprehensive overview of recent progress across these areas, in line with advances in quantum technology. We will discuss the potential of quantum devices in detecting subtle effects indicative of new physics BSM, the transformative role of quantum algorithms and large-scale quantum computers in studying real-time non-perturbative dynamics in the early universe and at colliders, as well as in analyzing complex HEP data. Additionally, we emphasize the importance of integrating quantum properties into HEP experiments to test quantum mechanics at unprecedented high-energy scales and search for hints of new physics. Looking ahead, the continued integration of resources to fully harness these evolving technologies will enhance our efforts to deepen our understanding of the fundamental laws of nature.

关键词： high energy physics quantum sensing quantum simulations quantum machine learning quantum information

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Continuous Review and Timely Correction: Enhancing the Resistance to Noisy Labels via Self-Not-True Distillation

Continuous Review and Timely Correction: Enhancing the Resis...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Jingyi Wang Da Huang Xinghao Wu Yuhua Tang Long Lan Institute for Quantum Information & State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

Deep neural networks possess substantial learning capacities and robust expressive power, making them prone to overfitting mislabeled data. Fortunately, the memorization effect shows that the networks tend to memorize the clean data first, and then gradually memorize the mislabeled data. Correspondingly, early stopping is proposed and has proven to be effective in mitigating overfitting. However, the networks can still overfit some mislabeled data in the early training stage, resulting in forgotten knowledge of clean data. In addition, early stopping lacks correction of errors caused by mislabeled data. In this paper, we propose that the network should continuously review the knowledge it learned earlier to enhance clean data memorization while timely correcting the incorrect knowledge learned from the mislabeled data. To implement these two ideas, we first introduce self-distillation into training, which employs a teacher network from the previous stage to guide the current network, enhancing clean data memorization. Based on this, we further propose the not-true distillation. Before distilling knowledge from the teacher network, we mask the true class (i.e. label class) in the logits, focusing only on not-true classes to correct the accumulated incorrect knowledge. Extensive experiments on simulated and realworld benchmarks adequately validate the superior performance of our method.

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FlyDB: Query Optimization of Blockchain System Based on Hybrid Storage Architecture 4

FlyDB: Query Optimization of Blockchain System Based on Hybr...

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4th International Seminar on Artificial Intelligence, Networking and Information technology, AINIT 2023

作者： Liu, Yang Xie, Zehui Xiao, Nong Chen, Zhiguang Ou, Yang Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer National University of Defense Technology Changsha China School of Computer Science and Engineering Sun Yat-sen University Guangzhou China College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9798350314526

The hybrid storage architecture incorporates a blockchain dual-index structure optimized for byte addressing in non-volatile memory, low-latency features, and the large capacity of SSD. This paper presents a novel LSM-Tree architecture that leverages the byte-Addressing characteristics of non-volatile memory. The layers of the level0 and level1 are stored in non-volatile memory while employing a local key-value separation strategy to minimize read and write operations during compaction. A logic compression strategy is proposed to handle data compression tasks efficiently. A dual-index structure design is introduced for users to address the scope and multi-keyword queries in the blockchain system. During the compression process, keyword switching occurs during data reordering, ensuring that data within the same SSTable is rearranged according to user preferences. By effectively harnessing the advantages of each level in the hybrid storage architecture, this design significantly reduces both databases write time and the response time for complex queries. © 2023 IEEE.

关键词： Blockchain

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LazyDB: I/O Optimization of Blockchain Storage System Based on Non-Volatile Memory 4

LazyDB: I/O Optimization of Blockchain Storage System Based ...

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4th International Conference on Information Science, Parallel and Distributed Systems, ISPDS 2023

作者： Liu, Yang Ge, Xuran Xiao, Nong Chen, Zhiguang Ou, Yang Institute for Quantum Information College of Computer National University of Defense Technology State Key Laboratory of High-Performance Computing Changsha China School of Computer Science and Engineering Sun Yat-sen University Guangzhou China College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9798350337181

For the blockchain storage system, this paper proposes an I/O optimization scheme based on non-volatile memory based on the storage performance requirements of the blockchain system application. This scheme adopts the key-value separation strategy. Due to the uncertain size of transaction data, by separating the 'key' and 'value' of transaction data, the inherent read-write amplification problem of the LSM-Tree structure is solved. The key-value separation strategy redesigns the storage system's space management and garbage collection mechanisms. Therefore, this chapter uses the byte-addressing characteristics of non-volatile memory to build a new data storage structure, a lazy compression mechanism, and a lazy garbage collection mechanism. On this basis, this paper builds a LazyDB database system for blockchain storage. To ensure the safe and reliable operation of the blockchain system, it can make full use of the storage medium and data characteristics, reducing the blockchain reading and writing process. The I/O overhead in the storage system improves the storage performance of the system. The experimental results show that compared with the most commonly used databases, such as LevelDB and RocksDB in the blockchain system, LazyDB effectively reduces the write amplification of the system and has higher read, write, and data update performance. © 2023 IEEE.

关键词： Blockchain

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Optimizing Self-training Sample Selection for Euphemism Detection in Special Scenarios 24th

Optimizing Self-training Sample Selection for Euphemism Dete...

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24th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2024

作者： Zhang, Zhiwei Chang, Shuyu Huang, Haiping Wang, Rui Nanjing University of Posts and Telecommunications Nanjing210023 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing210023 China Nanjing University of Posts and Telecommunications Nanjing210023 China State Key Laboratory Chinese of Computer Architecture Institute of Computing Technology Academy of Sciences Beijing100864 China

ISBN: (纸本)9789819615476

Euphemism, which is often used to disguise true intentions or soften the tone of speech, has garnered significant attention for its detection in recent years. Current approaches to euphemism detection struggle with uncommon data, where new and rare vocabularies frequently emerge in the test set, leading to decreased model performance. To address these challenges, we propose a novel framework that combines data augmentation, self-training, and a special sample selection method. We expand the original dataset using lexical and sentence-level data augmentation techniques, enhancing the representation of rare vocabulary and allowing the model to familiarize itself with their contexts and usage characteristics. Next, we employ self-training as a semi-supervised learning approach, utilizing the augmented datasets to iteratively generate and refine pseudo-labels. During each iteration, a KNN framework is used to generate pseudo-labels by searching for the nearest neighbor texts, thus enhancing the quality of these labels. Finally, to further increase the presence of rare vocabulary in the training data, we implement a sample selection strategy based on euphemism frequency and predictive uncertainty, integrating it with the earlier steps. Experimental results demonstrate that our framework outperforms previous research on most metrics and achieves a 10% increase over the baseline model. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Self-supervised learning

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Evaluating performance Portability of SYCL and Kokkos: A Case Study on LBM Simulations

Evaluating Performance Portability of SYCL and Kokkos: A Cas...

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IEEE International Conference on Big Data and Cloud computing (BdCloud)

作者： Yue Ding Chuanfu Xu Haozhong Qiu Qingsong Wang Weixi Dai Yongzhen Lin Yonggang Che Institute for Quantum Information & State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China

Since modern high performance computing systems are evolving towards diverse and heterogeneous architectures, the emergence of high-level portable programming models leads to a particular focus on performance portability. In this paper, we evaluate the performance portability and explore performance optimization methods for two portable programming models SYCL and Kokkos. We take an open-source multi-phase Lattice Boltzmann Method (LBM) flow simulation code as a case study and implement portable versions with different optimizations. Then we compare our portable implementations with engineer-tuned OpenMP and CUDA versions on Intel CPUs and NVIDIA GPUs. Experimental results show that both SYCL and Kokkos can deliver superior performance than traditional programming models, but the best performance of the portable versions depends heavily on platform-specific optimizations. There is no single implementation that can achieve the best performance on both CPUs and GPUs. Consequently, we conclude that the performance portability still needs to be further improved for both SYCL and Kokkos. In addition, we present a comparative analysis of different optimization methods that qualify the performance enhancement when using SYCL and Kokkos on CPUs and GPUs. Our work offers valuable references for the development of both portable programming models and applications.

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Constructions of Sidon spaces and cyclic subspace codes

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Frontiers of Mathematics in China 2022年第2期17卷 275-288页

作者： He ZHANG Xiwang CAO Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 211100China School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA) MIITNanjing 211106China

In this paper,we firstly construct several new kinds of Sidon spaces and Sidon sets by investigating some known ***,using these Sidon spaces,we will present a construction of cyclic subspace codes with cardinality τ,q^(n)-1/q-1 and minimum distance 2k-2,whereτis a positive *** further-more give some cyclic subspace codes with size 2τ·q^(n)-1/q-1 and without changing the minimum distance 2k-2.

关键词： Sidon spaces Sidon sets cyclic subspace codes minimum distance

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