检索结果-南通市图书馆

Graphene/Molybdenum Dichalcogenide-Based van der Waals Heterostructure Photodetectors: a Review

在线全文

学校读者我要写书评

暂无评论

新型炭材料(中英文) 2024年

作者： ZHANG Xin-hua LIU Wei-Di GONG You-pin LIU Qing-feng CHEN Zhi-Gang center of Quantum Materials and Devices at Institute of Advanced Interdisciplinary studies Soft Matter and Interdisciplinary Research Center College of Physics Chongqing University School of Chemistry and Physic ARC Research Hub in Zero-emission Power Generation for Carbon Neutrality and Center for Materials Science Queensland University of Technology State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University

Graphene is widely used in photodetection due to its high carrier mobility and wide spectral absorption ***, the high dark current due to its low light absorption severely limits the performance of photodetection. Molybdenum dihalide(MoX2, X= S, Se and Te) has a high absorption coefficient, which can compensate high dark current in graphene-based photodetectors and result in outstanding photoelectronic properties in graphene/MoX2 van der Waals heterostructure(vdWH) *** this review, we firstly review working principles, performance indicators, and structures of photodetectors. After that, the significance of graphene/MoX2 vdWH photodetectors are highlighted from the material fundamental perspective. Preparation methodologies and performance enhancement strategies of graphene/MoX2 vdWH photodetectors are correspondingly summarized. In the end, we highlight the current challenges and future directions of the graphene/MoX2 vdWH photodetectors. This review will guide the design of high-performance vdWH photodetectors.

关键词：

Recent progress and prospects of electrolytes for electrocatalytic nitrogen reduction toward ammonia

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 3-16页

作者： Sajid Mahmood Haiyan Wang Fang Chen Yijun Zhong Yong Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China The center for Applied Mathematics and Bioinformatics(CAMB) Gulf University for Science and TechnologyMishref 32093Kuwait Hangzhou Institute of Advanced studies Zhejiang Normal UniversityHangzhou 311231China

Electrochemical nitrogen reduction reaction(ENRR) provides a promising strategy to achieve sustainable synthesis of ammonia. However, despite great efforts devoted to this research field, the problems such as low energy efficiency and weak selectivity still impede its practical implementation. Most of the research to date has been concentrated on creating sophisticated electrocatalysts, and adequate knowledge of electrolytes is still lacking. Herein, the recent progress in electrolytes for ENRR, including alkaline, neutral,acidic, water-in-salt, organic, ionic liquid, and mixed water-organic electrolytes, is thoroughly reviewed to obtain an in-depth understanding of their effects on electrocatalytic performance. Recently developed representative electrocatalysts in various types of electrolytes are also introduced, and future research priorities of different electrolytes are proposed to develop new and efficient ENRR systems.

关键词： Electrocatalytic nitrogen reduction Ammonia Electrolytes Production rate Faradaic efficiency

Improving the Transmission Security of Vein Images Using a Bezier Curve and Long Short-Term Memory

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第6期79卷 4825-4844页

作者： Ahmed H.Alhadethi Ikram Smaoui Ahmed Fakhfakh Saad M.Darwish Computer Science and School of Electronics and Telecommunications University of SfaxSfax3029Tunisia LETI Laboratory University of SfaxSfax3029Tunisia Digital Research center of Sfax Technopark of SfaxSfax3029Tunisia Department of Information Technology Institute of Graduate Studies and ResearchAlexandria UniversityAlexandriaEgypt

The act of transmitting photos via the Internet has become a routine and significant *** the security measures to safeguard these images from counterfeiting and modifications is a critical domain that can still be further *** study presents a system that employs a range of approaches and algorithms to ensure the security of transmitted venous *** main goal of this work is to create a very effective system for compressing individual biometrics in order to improve the overall accuracy and security of digital photographs by means of image *** paper introduces a content-based image authentication mechanism that is suitable for usage across an untrusted network and resistant to data loss during *** employing scale attributes and a key-dependent parametric Long Short-Term Memory(LSTM),it is feasible to improve the resilience of digital signatures against image deterioration and strengthen their security against malicious ***,the successful implementation of transmitting biometric data in a compressed format over a wireless network has been *** applications involving the transmission and sharing of images across a *** suggested technique utilizes the scalability of a structural digital signature to attain a satisfactory equilibrium between security and picture *** effective adaptive compression strategy was created to lengthen the overall lifetime of the network by sharing the processing of *** scheme ensures a large reduction in computational and energy requirements while minimizing image quality *** approach employs multi-scale characteristics to improve the resistance of signatures against image *** proposed system attained a Gaussian noise value of 98%and a rotation accuracy surpassing 99%.

关键词： Image transmission image compression text hiding Bezier curve Histogram of Oriented Gradients(HOG) LSTM image enhancement Gaussian noise rotation

Ethics in Science and Technology and Human Rights Protection in the Digital Age

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of Human Rights 2024年第1期23卷 84-88页

作者：韩秀桃 LI Donglin the center for Sci&Tech and Human Rights studies at the Beijing Institute of Technology 不详

Since the advent of industrial society,the progress and development of science and technology have been closely intertwined with the protection of human *** as a crucial force in societal transformation,science and technology not only create a rich material foundation for improving people’s well-being but also greatly expand the theoretical connotation and practical value of human rights.

关键词： Human expand foundation

Asia-Pacific Inclusive Cooperation and China＇s Strategic Choice

在线全文

学校读者我要写书评

暂无评论

Fudan Journal of the Humanities and Social Sciences 2015年第3期8卷 415-426页

作者： Chen Shen center for brics studies Fudan University Shanghai China

Since the US took the lead in the Trans-Pacific Partnership （TPP） negotiations, the Asia-Pacific region has witnessed a growing trend in the ＂highlevel＂ and ＂high-standard＂ regional cooperation. Based on a thorough analysis of the underlying causes of mechanism division, this paper argues that division may not necessarily lead to antagonism, and that favorable conditions have been created in the operation and interaction between TPP and ＂10 ＋ N.＂ It further proposes some possible and practical ways that China should follow to achieve better co- patibility and cooperation with other countries in the region, thus promoting com- mon development.

关键词： Mechanism division Asia-Pacific inclusive cooperation China The US

Evolution of China's Role in the Structure of Global Carbon Emission Transfers:An Empirical Analysis Based on Network Governance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China & World Economy 2024年第1期32卷 130-166页

作者： Bingbing Zhang Lelan Kong Zhehong Xu Chuanwang Sun School of Economics and Management Nanjing Agricultural University Jiangsu Provincial center for Agricultural Foreign Cooperation and Communication China Paula and Gregory Chow Institute for studies in Economics Xiamen UniversityChina China center for Energy Economics Research School of Economics and MOE Key Laboratory of EconometricsXiamen UniversityChina

This paper reconsiders the roles of China and some developed countries in the network of carbon emission transfers via international trade in value added from a new perspective of network *** search intensity(NSI)and the extended gravity model are used with cross-country panel data to analyze the mechanism of China's engagement in network governance of carbon emission *** results show that from 2000 to 2009,China was a net exporter of carbon emissions,even though it shifted from the semi-periphery to the core in the network of carbon emissions embodied in ***,NSI had a significant positive impact on carbon emissions embodied in *** China's important role in the global production network and division of labor,NSI may also affect industrial structure and the quality of the ecological environment to a large *** study analyses the network governance mechanism of China's participation in global carbon *** results suggest that the technical complexity of export products and product heterogeneity do not change the positive impact of NSI on carbon emissions.

关键词： carbon emission transfers gravity model network governance network search intensity

Individual and joint exposures to PMconstituents and mortality risk among the oldest-old in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Life Sciences 2024年

作者： Yaqi Wang Yang Yuan Shaocai Mo Fang Wang Jing Wei Yao Yao Yi Zeng Yunquan Zhang Institute of Social Development and Health Management Hubei Province Key Laboratory of Occupational Hazard Identification and Control School of Public Health Wuhan University of Science and Technology Shenzhen Bao'an District Songgang People's Hospital School of Public Health Xuzhou Medical University Department of Atmospheric and Oceanic Science Earth System Science Interdisciplinary Center University of Maryland College Park China center for Health Development studies Peking University center for Healthy Aging and Development studies National School of Development Peking University

Cohort evidence linking long-term survival of older adults with exposure to fine particulate matter (PM2.5) constituents remains scarce in *** constructing a dynamic cohort based on the Chinese Longitudinal Healthy Longevity Study,we aimed to assess the individual and joint associations of major PM2.5constituents with all-cause death in Chinese oldest-old （≥80 years） ***-dependent Cox proportional hazards models were adopted to estimate death risks of long-term exposure to *** 14,884 participants,totaling 56,342 person-years of follow-up,12,346 deaths were *** highest mortality risk associated with an interquartile range（IQR） increase in exposure was 1.081 （95%confidence interval[CI]:1.055–1.108） for sulfate (IQR=4.1μg m–3),followed by 1.078 （95%CI:1.056–1.101） for black carbon (IQR=1.6μg m–3),1.056 （95%CI:1.028–1.084） for ammonium (IQR=3.2μg m–3),1.050 （95%CI:1.021–1.080） for nitrate (IQR=5.8μg m–3),and 1.049 （95%CI:1.024–1.074） for organic matter (IQR=10.3μg m–3).In joint exposure,each IQR-equivalent rise of all five PM2.5constituents was associated with an 8.2%（95%CI:4.0%–12.6%） increase in mortality *** weight analysis indicated the predominant role of sulfate and black carbon in driving PM2.5-related *** （aged 80–89 years） and rural dwellers were at significantly greater risk of mortality from individual and joint exposures to *** study suggests that later-life exposure to PM2.5constituents,particularly sulfate and black carbon,may curtail long-term survival of the oldest-old in China.

关键词：

Lithium polysulfide solvation and speciation in the aprotic lithium-sulfur batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第6期89卷 238-245页

作者： Jinhao Zhang Qingshan Fu Peng Li Ruibo Linghu Xiaozhong Fan Haibin Lin Juncao Bian Songbai Han Gengzhi Sun Long Kong Frontiers Science center for Flexible Electronics and Xi’an Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an710129China China Automotive Innovation Corporation Nanjing211100China Academy for Advanced Interdisciplinary studies Southern University of Science and TechnologyShenzhen518055China Institute of Advanced Materials Nanjing Tech UniversityNanjing211816China

Fingerprinting sulfur speciation in aprotic electrolytes is a key to understand fundamental chemistry and design well-performing lithium–sulfur(Li–S)*** polysulfide(LiPS)dissolution and deposition in ether-based electrolytes during redox reactions have been probed and established by spectroscopy and ***,detailed LiPS structure and solvation properties influenced by conventional and newly developed electrolytes remain elusive,which exert fundamental challenges and practical difficulties in decoupling battery performance from electrolyte *** perspective aims to provide timely information to uncover underlying mechanisms that rein in sulfur speciation by considering the charge density of LiPSs and the coordination strength of solvents/*** discussion starts with unlocking the baseline electrolyte formulation to investigate its role in LiPS formation and *** that,the term coordination strength is used instead of donor number and dielectric constant to describe interactions between solvents and LiPSs and to reveal LiPS structure *** work is expected to encourage the discovery of new electrolyte working mechanisms to develop energy-dense and power-intensive Li–S batteries.

关键词： Sulfur speciation Redox kinetics Coordination strength Solvation chemistry Lithium-sulfur batteries

Double-confined nanoheterostructure Sb/Sb_(2)S_(3)@Ti_(3)C_(2)T_(x)@C toward ultra-stable Li-/Na-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第5期43卷 2067-2079页

作者： Dan Wang Qun Ma Huan He Zhi-Yuan Wang Run-Guo Zheng Hong-Yu Sun Yan-Guo Liu Chun-Li Liu School of Materials Science and Engineering Northeastern UniversityShenyang110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China Department of Physics and Oxide Research center Hankuk University of Foreign StudiesYongin 17035Korea

Antimony-based materials with high capacities and moderate potentials are promising anodes for lithium-/-sodium-ion ***,their tremendous volume expansion and inferior conductivity lead to poor structural stability and sluggish reaction ***,a doubleconfined nanoheterostructure Sb/Sb_(2)S_(3)@Ti_(3)C_(2)T_(x)@C has been fabricated through a solvothermal method followed by low-temperature heat *** dual protection of“MXene”and“carbon”can better accommodate the volume expansion of Sb/Sb_(2)S_(3).The strong covalent bond(Ti-S,Ti-O-Sb,C-O-Sb)can firmly integrate Sb-based material with Ti_(3)C_(2)T_(x)and carbon,which significantly improves the structure *** addition,the carbon layer can restrain the oxidation of MXenes,and the nano-Sb/Sb_(2)S_(3)can facilitate electron/ion transport and suppress the restacking of *** heterogeneous interface between Sb and Sb_(2)S_(3)can further promote interfacial charge *** MXene-Sb/Sb_(2)S_(3)@C-1 with the optimal Sb content shows high specific capacities,comparable rate properties and ultra-stable cycling performances(250 m Ah·g^(-1)after 2500 cycles at 1 A·g^(-1)for sodium-ion batteries).Ex situ X-ray diffractometer(XRD)test reveals the storage mechanism including the conversion and alloying process of MXene-Sb/Sb_(2)S_(3)@*** voltammetry(CV)test results demonstrate that the pseudocapacitance behavior is dominant in MXene-Sb/Sb_(2)S_(3)@C-1,especially at large *** design paves the way for exploring high-performance alloy-based/conversion-type anode for energy storage devices.

关键词： Sb/Sb_(2)S_(3) MXene Carbon Anode Lithium-ion batteries Sodium-ion batteries