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China & World Economy 2024年第5期32卷 226-246页

作者： Pengfei wang Hongbo Li Zhenbin Huang College of Public Administration Huazhong Agricultural UniversityChina

The development of spatial interactions of land resources enhances virtual built-up land flow,which contributes to China's inter-regional trade *** is known about the degree of inequality among *** work seeks to estimate the degree of inter-regional trade inequality through environmental-economic *** combined a multiregional input-output model at the city level with a new classification to calculate the virtual built-up land flow among cities and analyzed its implications for the regional economy and carbon *** results indicate that developed regions were the main beneficiaries of inter-regional trade,as reflected in land-use ***'s economic hub has been progressively shifting southward,and the inter-regional trade inequality has continuously *** flow of virtual service industry land among developed regions rose,while underdeveloped regions remained suppliers of raw materials,further increasing inter-regional trade inequality.

关键词： built-up land carbon neutrality multiregional input-output model trade inequality

A novel indirect optical method for rock stress measurement using microdeformation field analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3616-3628页

作者： Yujie Feng Peng-Zhi Pan Zhaofeng wang Xufeng Liu Shuting Miao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

Stress measurement plays a crucial role in geomechanics and rock engineering,especially for the design and construction of large-scale rock *** paper presents a novel method,based on the traditional stress relief approach,for indirectly measuring rock stress using optical *** proposed method allows for the acquisition of full-field strain evolution on the borehole’s inner wall before and after disturbance,facilitating the determination of three-dimensional(3D)stress information at multiple points within a single *** study focuses on presenting the method’s theoretical framework,laboratory validation results,and equipment design *** theoretical framework comprises three key components:the optical imaging method of the borehole wall,the digital image correlation(DIC)method,and the stress calculation *** validation tests investigate strain field distribution on the borehole wall under varying stress conditions,with stress results derived from DIC strain ***,the optical method demonstrates better measurement accuracy during the unloading stage compared to conventional strain gauge *** relatively high stress levels,the optical method demonstrates a relative error of less than 7%and an absolute error within 0.5 ***,a comparative analysis between the optical method and the conventional contact resistance strain gauge method highlights the optical method’s enhanced accuracy and stability,particularly during the unloading *** proposed optical stress measurement device represents a pioneering effort in the application of DIC technology to rock engineering,highlighting its potential to advance stress measurement techniques in the field.

关键词： Rock stress measurement Optical technology Digital image correlation(DIC)technology Micro-deformation field

Control of light-matter interactions in two-dimensional materials with nanoparticle-on-mirror structures

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Opto-Electronic Science 2024年第7期3卷 1-19页

作者： Shasha Li Yini Fang Jianfang wang School of Integrated Circuits Sun Yat-sen UniversityShenzhen 518107China Department of Physics The Chinese University of Hong KongShatinHong Kong SAR 999077China

Light–matter interactions in two-dimensional(2D)materials have been the focus of research since the discovery of *** light–matter interaction length in 2D materials is,however,much shorter than that in bulk materials owing to the atomic nature of 2D *** nanostructures are usually integrated with 2D materials to enhance the light–matter interactions,offering great opportunities for both fundamental research and technological ***-on-mirror(NPo M)structures with extremely confined optical fields are highly desired in this *** addition,2D materials provide a good platform for the study of plasmonic fields with subnanometer resolution and quantum plasmonics down to the characteristic length scale of a single atom.A focused and up-to-date review article is highly desired for a timely summary of the progress in this rapidly growing field and to encourage more research efforts in this *** this review,we will first introduce the basic concepts of plasmonic modes in NPo M *** between plasmons and quasi-particles in 2D materials,e.g.,excitons and phonons,from weak to strong coupling and potential applications will then be described in *** phenomena in subnanometer metallic gaps separated by 2D materials,such as quantum tunneling,will also be *** will finally discuss phenomena and physical processes that have not been understood clearly and provide an outlook for future *** believe that the hybrid systems of2D materials and NPo M structures will be a promising research field in the future.

关键词： light-matter interactions nanoparticle-on-mirror structures plasmonic enhancement two-dimensional materials

Triboelectric nanogenerator integrated with a simple controlled switch for regularized water wave energy harvesting

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Nano Research 2024年第8期17卷 7585-7592页

作者： Hongbo Yang Xi Liang Junwu Kan Zhong Lin wang Tao Jiang Zhanyong Hong College of Engineering Zhejiang Normal UniversityJinhua 321004China Beijing Key Laboratory of Micro-Nano Energy and Sensor Center for High-Entropy Energy and SystemsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China The Beijing Key Laboratory for Nano-Photonics and Nano-Structure Department of PhysicsCapital Normal UniversityBeijing 100048China Guangzhou Institute of Blue Energy Guangzhou 510555China Georgia Institute of Technology AtlantaGA 30332-0245USA Yonsei Frontier Lab Yonsei UniversitySeoul 03722Republic of Korea

Ocean is full of low-frequency,irregular,and widely distributed wave energy,which is suitable as the energy source for maritime Internet of Things(IoTs).Utilizing triboelectric nanogenerators(TENGs)to harvest ocean wave energy and power sensors is proven to be an effective ***,in random ocean waves,the irregular electrical energy output by general TENGs restricts the *** present,achieving regularized water wave energy harvesting relies on rather complex mechanical structure designs,which is not conducive to *** this work,we proposed a novel mechanical controlled TENG(MCTENG)with a simple controlled switch to realize the regularization *** structural parameters of the MC-TENG are optimized,and the optimal output voltage,output current,and transferred charge respectively reach 1684.2 V,85.4μA,and 389.9 nC,generating a peak power density of 38.46 W·m^(−3)·Hz^(−1).Under real water wave environment,the output of the MC-TENG is regularized and keeps stable regardless of any wave ***,the potential applications of the MC-TENG are demonstrated in powering environmental temperature,humidity,and wind speed *** work renders a simple approach to achieve effective regularized ocean wave energy harvesting,promoting the TENG industrialization toward practical application of maritime IoTs.

关键词： water wave energy harvesting triboelectric nanogenerators random excitation mechanical control regular output

基于密度泛函的C_(4)F_(7)N/N_(2)/O_(2)三元混合气体击穿及分解特性分析

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工程科学与技术 2024年第5期56卷 127-135页

作者：刘提陈聪吴震陈桓国网浙江省电力有限公司建设分公司浙江杭州310016

C_(4)F_(7)N具有优异的绝缘性能和环保特性,是有潜力替代SF_(6)的环保型绝缘气体。目前,主要采用CO_(2)作为C_(4)F_(7)N的缓冲气体,其含量一般大于90%,由于CO_(2)为温室气体,将CO_(2)替换为N_(2)后与C_(4)F_(7)N混合,会使混合气体环保... 详细信息

C_(4)F_(7)N具有优异的绝缘性能和环保特性,是有潜力替代SF_(6)的环保型绝缘气体。目前,主要采用CO_(2)作为C_(4)F_(7)N的缓冲气体,其含量一般大于90%,由于CO_(2)为温室气体,将CO_(2)替换为N_(2)后与C_(4)F_(7)N混合,会使混合气体环保性大大提升。虽然,C_(4)F_(7)N/N_(2)混合气体在放电时可能有固体碳析出情况,严重影响气体绝缘设备正常运行,但是,O_(2)的加入能够改善C_(4)F_(7)N/N_(2)二元混合气体的击穿特性,抑制分解产物的产生。为此,本文基于密度泛函理论计算了O_(2)及C_(4)F_(7)N/N_(2)混合气体的电子亲和能、电负性、不同分子数量的O_(2)和N_(2)与C_(4)F_(7)N气体之间的相互作用能及电荷转移量,得出了C_(4)F_(7)N分子的福井函数、C_(4)F_(7)N/N_(2)/O_(2)各气体分子化学键的解离能,分析了C_(4)F_(7)N与O_(2)放电分解涉及的自由基反应过程,从微观角度研究O_(2)对C_(4)F_(7)N/N_(2)混合气体击穿特性及分解特性的影响。结果表明:相较于N_(2),O_(2)的电子亲和能及电负性更强,加入O_(2)有助于提高C_(4)F_(7)N/N_(2)混合气体的击穿电压。O_(2)-C_(4)F_(7)N的相互作用能约为N_(2)-C_(4)F_(7)N相互作用能的5倍;随着缓冲气体分子数量的增加,缓冲气体与C_(4)F_(7)N之间电荷转移量逐渐增加,使得C_(4)F_(7)N/O_(2)体系中C_(4)F_(7)N得到电子,而C_(4)F_(7)N/N_(2)体系中C_(4)F_(7)N失去电子。C_(4)F_(7)N未发生放电分解时,缓冲气体与C_(4)F_(7)N分子间主要以物理作用为主,O_(2)的加入消耗C_(4)F_(7)N分解产生的CF_(2)·与C·自由基,减少金属电极表面碳单质的附着。综上,O_(2)的加入能够减少碰撞电离,消耗C_(4)F_(7)N分解产生的自由基,抑制分解产物的产生,改善三元混合气体C_(4)F_(7)N/N_(2)/O_(2)的击穿特性及分解特性。

关键词： C_(4)F_(7)N/N_(2)混合气体密度泛函理论 O_(2) 击穿特性分解特性

In-situ observation of structural evolution of single-atom catalysts:From synthesis to catalysis

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ChemPhysMater 2024年第1期3卷 24-35页

作者： Lei wang Shuyuan Lyu Shuohao Li School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China School of Art and Design Huaiyin Institute of TechnologyHuaian 223003China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

Atomically dispersed single-atom catalysts(SACs)have been extensively studied over the past decade because of their high atom utilization efficiencies and specific *** numerous strategies have been proposed to obtain SACs with high densities and stabilities,the transformation mechanism that occurs during the reaction is still *** review summarizes the structural evolution of SACs in the preparation process and reaction with various electron microscopy techniques at atomic scale under environmental *** state-of-the-art environmental electron microscopy studies on SACs mainly focus on porous carbons,metals or metal oxides,and some specific composite *** dynamic evolution of SACs under various reaction conditions is also investigated in this ***,we highlight the challenges and drawbacks of the current studies and the prospects for the future exploration of SACs with environmental strategies.

关键词： Single-atom catalysts Structural transformation Atomization Environmental electron microscope

Transient self-assembly driven by chemical fuels

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ChemPhysMater 2024年第1期3卷 1-23页

作者： Ling wang Jin Yuan Jingcheng Hao Key Laboratory of Colloid and Interface Chemistry Shandong UniversityMinistry of EducationJinan 250100China School of Chemistry and Chemical Engineering Qilu Normal UniversityJinan 250200China

Self-assembly has been extensively studied in chemistry,physics,biology,and materials engineering and has become an important“bottom-up”approach in creating intriguing structures for different *** dissipative self-assembly to construct fuel-dependent,energy-consuming,and dynamic nonequilibrium systems is important for developing intelligent life-like ***,dissipative self-assembly has become a research hotspot in materials chemistry,biomedical science,environmental chemistry,and physical *** in-depth understanding of the process and mechanism provides useful insights to the researchers for devel-oping materials using dissipative self-assembly and also helps guide future innovation in material *** critical review comprehensively analyzes various chemical fuel input and energy consumption mechanisms,supported by numerous illustrative *** transient assemblies,including gels,vesicles,micelles,and nanoparticle aggregates,have been systematically studied in our and other *** relationship between the molecular structure of precursors and temporal assemblies in dissipative self-assemblies is discussed from the perspective of physical *** dissipative self-assembly methods to construct functional assemblies provides important implications for constructing high-energy,nonequilibrium,and intelligent functional materials.

关键词： Self-Assembly Chemical Fuel Consumption mechanisms Functional assemblies

A Novel Quantization and Model Compression Approach for Hardware Accelerators in Edge Computing

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Computers, Materials & Continua 2024年第8期80卷 3021-3045页

作者： Fangzhou He Ke Ding DingjiangYan Jie Li Jiajun wang Mingzhe Chen State Key Laboratory of Intelligent Vehicle Safety Technology Chongqing401133China Foresight Technology Institute Chongqing Changan Automobile Co.Ltd.Chongqing400023China School of Computer Science and Engineering Chongqing University of Science and TechnologyChongqing401331China

Massive computational complexity and memory requirement of artificial intelligence models impede their deploy-ability on edge computing devices of the Internet of Things(IoT).While Power-of-Two(PoT)quantization is pro-posed to improve the efficiency for edge inference of Deep Neural Networks(DNNs),existing PoT schemes require a huge amount of bit-wise manipulation and have large memory overhead,and their efficiency is bounded by the bottleneck of computation latency and memory *** tackle this challenge,we present an efficient inference approach on the basis of PoT quantization and model *** integer-only scalar PoT quantization(IOS-PoT)is designed jointly with a distribution loss regularizer,wherein the regularizer minimizes quantization errors and training ***,two-stage model compression is developed to effectively reduce memory requirement,and alleviate bandwidth usage in communications of networked heterogenous learning *** product look-up table(P-LUT)inference scheme is leveraged to replace bit-shifting with only indexing and addition operations for achieving low-latency computation and implementing efficient edge ***,comprehensive experiments on Residual Networks(ResNets)and efficient architectures with Canadian Institute for Advanced Research(CIFAR),ImageNet,and Real-world Affective Faces Database(RAF-DB)datasets,indicate that our approach achieves 2×∼10×improvement in the reduction of both weight size and computation cost in comparison to state-of-the-art methods.A P-LUT accelerator prototype is implemented on the Xilinx KV260 Field Programmable Gate Array(FPGA)platform for accelerating convolution operations,with performance results showing that P-LUT reduces memory footprint by 1.45×,achieves more than 3×power efficiency and 2×resource efficiency,compared to the conventional bit-shifting scheme.

关键词： Edge computing model compression hardware accelerator power-of-two quantization

Reconceptualization of immune checkpoint inhibitor-associated gastritis

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World Journal of Gastroenterology 2024年第36期30卷 4031-4035页

作者： Ying-Fang Deng Xian-Shu Cui Liang wang Department of Oncology Affiliated Hospital of Qinghai UniversityXining 810000Qinghai ProvinceChina Department of Gastrointestinal Oncology Surgery Affiliated Hospital of Qinghai UniversityXining 810000Qinghai ProvinceChina

In recent years,with the extensive application of immunotherapy in clinical practice,it has achieved encouraging therapeutic *** enhancing clinical efficacy,however,it can also cause autoimmune damage,triggering immunerelated adverse events(irAEs).Reports of immunotherapy-induced gastritis have been increasing annually,but due to its atypical clinical symptoms,early diagnosis poses a certain ***,it can lead to severe complications such as gastric bleeding,elevating the risk of adverse outcomes for solid tumor patients if immunotherapy is ***,gaining a thorough understanding of the pathogenesis,clinical manifestations,diagnostic criteria,and treatment of immune-related gastritis is of utmost importance for early identification,diagnosis,and ***,the treatment of immune-related gastritis should be personalized according to the specific condition of each *** patients with grade 2-3 irAEs,restarting immune checkpoint inhibitors(ICIs)therapy may be considered when symptoms subside to grade *** restarting ICIs therapy,it is often recommended to use different types of *** grade 4 irAEs,permanent discontinuation of the medication is necessary.

关键词： Programmed cell death receptor-1 Programmed cell death-ligand 1 Cytotoxic T lymphocyte-associated antigen 4 Immune-related adverse events Immune-related gastritis

Digital Revolution and Job Quality of Lower Class Workers: Quasi-experimental Evidence from the Broadband China Program

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China & World Economy 2024年第4期32卷 146-178页

作者： Xiumei wang Ye Jiang Famin Yi School of Business Fuyang Normal UniversityChina Department of Economics Dickinson CollegeUSA School of Economics and Management South China Agricultural UniversityChina

This study examines the impact of the digital revolution on the job quality of workers with a specific focus on those at the lowest end of the spectrum in China's domestic labor market. Leveraging exogenous timing variations that result from the implementation of the Broadband China Program across different cities, it provides quasi-experimental evidence concerning the effects of the digital revolution on the job quality of lower class workers, particularly rural–urban migrant workers. Using data from China Migrants Dynamic Survey, this study reveals that migrants' comprehensive job quality index increased by 0.0138 (5.33 percent), and its component indices experienced positive effects after the Broadband China Program was implemented. This study also investigates heterogeneous policy treatment effects among workers with diverse demographic and occupational characteristics. Underlying mechanisms are considered, including positive macroeconomic shocks, increased social interactions, and Internet use. In particular, migrants' attitudes toward local settlement became more positive, suggesting that the positive effects of the digital revolution on livelihood lasted for some time. Taking China as an example, this study contributes valuable empirical evidence of how the digital revolution can affect lower class workers' employment or living conditions in a developing country. Related policy implications are also considered.

关键词： Broadband China Program digital revolution job quality lower clas workers rural-urban migrants