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Potassium ions and cyano group modified g-C3N4 for effective generation of H2O2 through two-electron oxygen reduction

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Science China Chemistry 2025年第1期68卷 192-200页

作者： Dongying Wang Shulan Pu Yongmin Chen Ke Lei Yujie Duan Linjiao Mao Xuhui Zeng Xi Luo Yuntao zhang Yuqin Dong jin Zhong zhang Yan Sun School of Mechanical Engineering Chengdu University Department of Chemistry and Biochemistry University of California

Potassium ions （K+） doped graphitic carbon nitride （g-C3N4） was prepared by a thermal etching method using potassium hydroxide （KOH） as an ion *** transform infrared spectroscopy （FTIR） and X-ray photoelectron spectroscopy （XPS）results showed that the generation of the cyano group was detected while introducing K+.Under simulated sunlight irradiation,the sample with a K+doping amount of 10%showed the highest hydrogen peroxide （H2O2） generation rate of2,140.2μmol *** apparent quantum yield （AQY） at 400 nm and the solar-to-chemical conversion （SCC） are 4.35%and1.23%,respectively.K+acted as a bridge between g-C3N4layers,which enhanced charge transfer ***,the cyano group enhanced the adsorption capacity of protons （H+） and promoted the yield of *** catalyst exhibited excellent photocatalytic stability based on four-cycle *** addition,a mechanism study showed that superoxide radicals （·O2-）were the most important active species in the reaction *** production of H2O2was achieved through consecutive single-electron *** study deepens the understanding of the oxygen reduction reaction process and opens up a new venue for improving H2O2generation.

关键词： photocatalysis hydrogen peroxide oxygen reduction reaction potassium doping cyano group

An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

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Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai zhang Liping Ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou Feng Ding Yue Hu jin zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

基于残差U-net网络的地震资料分辨率提高方法

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中国海洋大学学报（自然科学版） 2025年第1期55卷 140-148页

作者：董博艺张进中国海洋大学海洋地球科学学院山东青岛266100 青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室山东青岛266237 中国海洋大学海底科学与探测技术教育部重点实验室山东青岛266100

高分辨率地震资料处理是获取高品质地震资料、实现薄储层良好地震地质解释的关键。传统提高地震分辨率的方法应用条件苛刻,关键参数求取复杂,在实际应用中受到诸多限制。深度学习中的U-net网络以纯数据驱动的优势,可学习低分辨率地震记... 详细信息

高分辨率地震资料处理是获取高品质地震资料、实现薄储层良好地震地质解释的关键。传统提高地震分辨率的方法应用条件苛刻,关键参数求取复杂,在实际应用中受到诸多限制。深度学习中的U-net网络以纯数据驱动的优势,可学习低分辨率地震记录到高分辨率标签的非线性关系,实现地震资料的高分辨率处理。本文设计了残差U-net网络结构,同时提出了基于概率密度函数控制的同分布反射系数集生成方法,将测井反射系数的概率密度函数作为一种先验约束信息融入训练样本,不仅保证了足够的同分布样本来训练网络,还确保了训练样本更符合工区实际情况,以此提高模型预测的准确性。模型测试和实际资料应用结果表明,本文提出的方法能够有效应用于地震资料分辨率的提高,同时拓宽频带。

关键词：提高分辨率 U-net 残差结构同分布

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多模态话语分析视角下纪录片字幕英译探析——以《非遗有新人》为例

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语言与文化研究

语言与文化研究 2025年第1期33卷 174-177页

作者：张金武汉工程大学武汉430205

在全球文化交融的时代背景下,纪录片凭借其影像的真实性,成为文化传播的重要载体。近年来,随着制作双语字幕纪录片的数量逐渐增多,字幕翻译质量的重要性愈发凸显。本文基于张德禄教授提出的多模态话语分析理论,以纪录片《非遗有新人》... 详细信息

在全球文化交融的时代背景下,纪录片凭借其影像的真实性,成为文化传播的重要载体。近年来,随着制作双语字幕纪录片的数量逐渐增多,字幕翻译质量的重要性愈发凸显。本文基于张德禄教授提出的多模态话语分析理论,以纪录片《非遗有新人》作为翻译语料,主要从文化、语境、内容和表达四个层面探讨纪录片字幕英译方法,并探索如何从多模态视角增强纪录片的表现力,为观众带来更好的视听体验。

关键词：多模态话语分析纪录片字幕翻译《非遗有新人》

Scalar one-loop four-point integral with one massless vertex in loop regularization

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Communications in Theoretical Physics 2021年第10期73卷 132-146页

作者： jin zhang School of Physics and Electronic Engineering Yuxi Normal UniversityYuxiYunnan653100China

The scalar one-loop four-point function with one massless vertex is evaluated analytically by employing the loop regularization method. According to the method, a characteristic scale μs is introduced to regularize the divergent integrals. The infrared divergent parts, which take the form of ln2(λ^(2)/μ_(s)^(2))and ln(λ^(2)/μ_(s)^(2))as μ_(s)→ 0 where λ is a constant and expressed in terms of masses and Mandelstam variables, and the infrared stable parts are well separated. The result is shown explicitly via 44 dilogarithms in the kinematic sector in which our evaluation is valid.

关键词： one-loop four-point integral loop regularization dilogarithm

A synchrotron self-Compton scenario for the very high energy γ-ray emission of the intermediate BL Lacertae object W Comae

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Research in Astronomy and Astrophysics 2009年第7期9卷 777-782页

作者： jin zhang National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China College of Physics and ElectronicEngineering Guangxi Teachers Education University Nanning 530001 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

W Comae has significant variability in multi-wavelengthes, from radio to gamma-ray bands. A bright outburst in optical and X-ray bands was observed in 1998, and most recently, a strong TeV flare was detected by VERITAS in 2008. It is the first TeV intermediate-frequency-peaked BL Lacertae source. I find that both the broadband spectral energy distributions （SEDs） which were quasi-simultaneously obtained during the TeV flare and during the optical/X-ray outburst are well fit by using a single-zone synchrotron ＋ synchrotron-self-Compton model. The satisfactory fitting requires a large beaming factor, i.e., δ- 25 and δ- 20 for the TeV flare and the optical/X-ray outburst, respectively, suggesting that both the optical/X-ray outburst and the TeV flare are from a relativistic jet. The size of the emission region of the TeV flare is three times larger than that of the optical/X-ray outburst, and the strength of the magnetic field for the TeV flare is - 14 times smaller than that of the X-ray/optical outburst, likely indicating that the region of the TeV flare is more distant from the core than that of the X-ray/optical outburst. The inverse Compton component of the TeV flare peaks around 1.3 GeV, but it is around 20 MeV for the X-ray/optical outburst, lower than that for the TeV flare by two orders of magnitude. The model predicts that the optical/X-ray outburst might be accompanied by a strong MeV/GeV emission, but the TeV flare may be not associated with the X-ray/optical outburst. The GeV emission is critical for characterizing the SEDs of the optical/X-ray outburst and the TeV flare. The predicted GeV flux is above the sensitivity of Fermi/LAT, and it could be verified with the observations by Fermi/LAT in the near future.

关键词： BL Lacertae objects: individual: W Comae - gamma-rays observations - gamma-rays theory - radiation mechanisms non-thermal

Impacts of Different Dynamic Factors on the Saltwater Intrusion in the Northern Branch of the Yangtze Estuary

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China Ocean Engineering 2019年第6期33卷 673-684页

作者： WANG jin-hua zhang De-bin zhang Wei-sheng zhang jin-shan State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

A 3-D baroclinic numerical model is established to study the temporal and spatial distribution of salinity in the Northern Branch(NB) of the Yangtze Estuary(YE) in response to river runoff, wind and currents. The idealized,process-oriented studies show that the lower river runoff in the dry season is the main driving factor for the spilling over from the NB to the Southern Branch(SB). The NB takes longer time to get in dynamic stable state compared with the SB, as the runoff transfers from the wet season to the dry season. The vertical stratification intensity of the NB has obvious periodic phenomena in the dry season, and the stratification strength is enhanced under the action of low runoff and north wind, which further weakens the vertical transport of water. Momentum balance analysis suggested that the landward net flux increases when considering the influence of the moderate north wind, and the landward flux will enhance if considering the boundary current during the spring tide. With the influence of the boundary current, increases the average salinity of the NB, as well as the intrusion degree from the NB to the *** indicates that the nearshore ocean current of the Yellow Sea is an important factor affecting the saltwater intrusion in the NB of the YE.

关键词： Yangtze Estuary saltwater intrusion ocean currents vertical stratification FVCOM

Simulation of Static Recrystallization Behavior of 58SiMn Steel

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 446-451页

作者： zhang jin zhang Yecheng HUANG Shaodong nstitute of Advanced Materials and Technology University of Science and Technology Beijing Beij＇ing 100083 China College of Material Science and Engineering Chongqing University of Technology Chongqing 400050 China No. 59 Institute of China Ordnance Industry Chongqing 400039 China

58SiMn steel can be used as a kind of material for projectile-like barrel *** producing barrel parts,the microstructure of the barrel parts will be changed due to its hot deformation at certain high temperature,which resulted in the variety of the part＇s mechanical *** is necessary to optimize the parameters for recrystallization process by prediction and *** double-pass hot compression tests were conducted using Gleeble 1500 System at different deformation temperature,strain rate and *** of pre-strain,deformation temperature on the curve of stress-strain has been *** static recrystallization fraction of double-pass hot deformation was computed and analyzed using compensation *** actual grain size was measured by metallographic method using oxidation process,which overcomes the difficulty in revealing grain size of 58SiMn *** oxidation process was the method of heating the martensite in very fast speed and use of its microstructure inherent characteristic and regarding the size of austenite grain as the maximum of martensite *** regression of the experimental data,the mathematical model of static recrystallization is set *** average grain size of 58SiMn steel during hot deformation was calculated by deform-3D software and verified by *** results show that the rate of static recrystallization was in direct proportional to the pre-strain of the *** grain size decreased with the increase of holding time at low deformation temperature 1 173 K and pre-strain *** mathematical model proposed could be used for predicting the static recrystallization behaviors of 58SiMn steel.

关键词： static recrystallization mathematical model simulation grain size 58SiMn steel

Algorithms for degree-constrained Euclidean Steiner minimal tree

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Journal of Systems Engineering and Electronics 2008年第4期19卷 735-741页

作者： zhang jin Ma Liang zhang Liantang School of Management Univ. of Shanghai for Science and Technology Shanghai 200093 P. R. China Computer and Information Engineering Coll. Univ. of Henan Kaifeng 475001 P. R. China

A new problem of degree-constrained Euclidean Steiner minimal tree is discussed, which is quite useful in several fields. Although it is slightly different from the traditional degree-constrained minimal spanning tree, it is also NP-hard. Two intelligent algorithms are proposed in an attempt to solve this difficult problem. Series of numerical examples are tested, which demonstrate that the algorithms also work well in practice.

关键词： degree-constrained Euclidean Steiner minimal tree simulated annealing ant algorithm