检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Chen, Jian Kang, Yao Wang, Xudong Huang, Hao Yao, Man Key Laboratory of Energy Materials and Devices Liaoning China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China Key Laboratory of Solidification Control and Digital Preparation Technology Dalian University of Technology Liaoning Dalian116024 China

As a member of the new two-dimensional materials family, functionalized MoB (MBene) attracts great interest as energy storage materials due to their excellent mechanical properties and metallicity. Here, we aim to leverage the superior properties of MBene to develop new promising electron materials for Li/Na-ion batteries by designing the MoS2 /MoBS heterostructure. Our investigation focuses on the structural stability, mechanical and electrochemical properties by first-principles calculation. The high Young’s modulus, robust structural stability and metallicity prevent the electrode pulverization and guarantee cycle stability of battery. Impressively, the interlayer diffusion barriers of Li and Na atoms are only 0.26 and 0.16 eV, outperforming other MoS2-based heterostructures. With calculated open circuit voltage of 0.01-1.83 V for Li atoms and 0.02-1.28 V for Na atoms, the heterostructure is suitable for deployment as an anode material. Besides, the reversible specific capacity (376 mAh/g) of Li atoms is improved by the electron transfer caused by the formation of heterostructure compared to that of monolayer MoS2 (335 mAh/g) and MoBS(193 mAh/g). These findings fully underline the potential of MoS2/MoBS heterostructure as anode material of Li/Na-ion batteries. © 2024, The Authors. All rights reserved.

关键词： Stability

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Shielding Effectiveness of Chassis Based on DGTD Method

Analysis of the Shielding Effectiveness of Chassis Based on ...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Jia, Zheng Lang Zhao, Lei Xue, Zhao Sheng Liu, Ying Zhang, Huan Huan Jiang, L.J. Xidian University National Key Laboratory of Antennas and Microwave Technology Xi'an China China University of Mining and Technology School of Information and Control Engineering Xuzhou China The University of Hong Kong Department of Electrical and Electronic Engineering Hong Kong

ISBN: (纸本)9781665452366

An electromagnetic simulation method is proposed for shielding effectiveness (SE) of chassis in this paper. The discontinuous Galerkin time-domain (DGTD) equation is established based on Maxwell's equation. The uniaxial perfectly matched layer (UPML) is used as an absorbing boundary condition to simulate an open space. At last, the method is applied to analyze the effect of the aspect ratios of rectangular apertures on shielding effectiveness. © 2022 IEEE.

关键词： Chassis

来源：评论

学校读者我要写书评

暂无评论

Analytical Solution of Mechanical Response in Large Diameter Ring Structure Considering Shear Effect

Analytical Solution of Mechanical Response in Large Diameter...

引用

2024 International Conference on Construction and Real Estate Management: ESG Development in the Construction Industry, ICCREM 2024

作者： Zeng, Yi Zhang, Yanlong Chen, Fubin Lu, Andian Yelv, Gendi Xiong, Wang Wu, Ze Li, Xiaoping Fu, Yanbin Guo, Yuehua Liao, Longhui Zhu, Junzhou Shanghai Tunnel Engineering & Rail Transit Design and Research Institute Shanghai China Guangdong Provincial Key Laboratory of Tunnel Safety and Emergency Support Technology & Equipment Guangzhou China Guangdong Hualu Transport Technology Co. Ltd. Guangzhou China Shenzhen Traffic Engineering Quality Supervision Station Guangdong Shenzhen China Guangdong GDH Pearl River Delta Water Supply Co. Ltd. Guangdong Guangzhou China Sinohydro Bureau 14 Co. Ltd. Guangdong Shenzhen China Urban Rail Transit Design and Research Institute China Railway Engineering Design and Consulting Group Co Ltd. Beijing China State Key Laboratory of Intelligent Geotechnics and Tunnelling College of Civil and Transportation Engineering Shenzhen Univ. Guangdong Shenzhen China CCCC-FHEC Ecological Engineering Co. Ltd. China College of Civil and Transportation Engineering Shenzhen Univ. Guangdong Shenzhen China

ISBN: (数字)9780784485910

ISBN: (纸本)9780784485910

The adjacent engineering construction will cause the underground structure not only the bending deformation but also the shear deformation. Focusing on the shear deformation after the deflection of the circumferential section, ring structure is assumed to be homogeneous isotropic elastic, and a series of analytical solutions of bending stress, shear stress, shear force, axial force, and bending moment of the ring structure under the concentrated load are derived. The analytical solution of the ring structure is verified by the monitored data of the engineering case that the pile foundation pressed the tunnel structure. Taking the Chunfeng Tunnel as an example for parameter analysis shows that the ring structure has a significant shear effect under the action of concentrated load. The shear force increment of the ring structure is greater when it is closer to the load point. The analytical solution in this paper can provide a theoretical basis for the calculation and performance evaluation of ring structures such as tunnels. © ASCE.

关键词： Piles

来源：评论

学校读者我要写书评

暂无评论

Adsorption-desorption behaviors of ciprofloxacin onto aged polystyrene fragments in aquatic environments

引用

Chemosphere 2023年第1期341卷 139995页

作者： Liu, Xiao-Yang Wang, Ning Lv, Long-Yi Wang, Peng-Fei Gao, Wen-Fang Sun, Li Zhang, Guang-Ming Ren, Zhi-Jun Tianjin Key Laboratory of Clean Energy and Pollution Control School of Energy and Environmental Engineering Hebei University of Technology Tianjin300401 China

As two emerging pollutants of great concern, microplastics (MPs) and antibiotics inevitably cooccur in various aquatic environments and interact with each other, impacting the fate and ecological risks. Aging obviously complicates their interaction and deserves further study. Therefore, the adsorption-desorption behaviors of ciprofloxacin (CIP) onto polystyrene (PS) fragments with various aging extent were investigated, and the key physiochemical properties influencing the interaction and the interaction mechanisms were clarified by redundancy analysis, FTIR and XPS spectra. The physicochemical properties of PS MPs were significantly changed with aging time, and the morphological and chemical changes seemed to occur asynchronously. The adsorption of CIP onto the pristine PS MPs relied on physisorption, especially the ion-involving electrostatic and cation-π interaction. Due to the hydrogen bonding formed by the C–OH, C[dbnd]O, and O–C[dbnd]O groups of PS and CIP, the adsorption capacities of the aged PS MPs were greatly increased. The desorption efficiency of CIP from MPs in the gastric fluid was closely related to the solution ionic strengths, C–OH and C[dbnd]O groups of MPs, while that in the intestinal fluid was associated with O–C[dbnd]O groups of MPs. The different impact factors could be well described by the differences in the chemical components and pHs of the simulated gastric and intestinal fluids. This study gives a comprehensive understanding of the adsorption-desorption behaviors of antibiotics onto MPs at a molecular level and indicates that MPs could act as Trojan horses to transport antibiotics into aquatic organisms. © 2023

关键词： Microplastic

来源：评论

学校读者我要写书评

暂无评论

Highly efficient poly (ionic liquid)-modified copper-carbon tandem catalysts for electrocatalytic CO2 reduction to ethylene

SSRN

引用

SSRN 2025年

作者： Yu, Aimei Deng, Kai Pang, Jun Zhu, Tao MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing210094 China School of Mechanical and Electrical Engineering Chuzhou University Chuzhou239000 China Anhui Province Key Laboratory of Advanced Numerical Control&Servo Technology Anhui Polytechnic University Wuhu241000 China

The challenge faced by ionic liquid-based electrocatalytic CO2 reduction is achieving high selectivity for ethylene production at high reaction rates (≥100 mA cm-2). In this study, we present a novel composite material copper@poly(ionic liquid)@ graphene oxide (abbreviated as Cu@PIL@GOi). The hybrid composite demonstrates directional reduction of ethylene with current density of more than 300 mA cm−2. Notably, Cu@PIL@GO3 demonstrates exceptional selectivity for C2H4 at -1.28 V (vs. RHE) with a faraday efficiency (FEC2H4) of 69.12%, which is approximately three times higher than that of pristine Cu (27.5%). Further, the highest ethylene partial current density of 453 mA cm−2 was achieved. Experimental and theoretical analysis reveals that the outer PIL layer and graphene-substrate enrich local CO2 concentration, thereby promoting the CO2 supply. Moreover, the structure and surface characteristics of Cu@PIL@GOi were examined by using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) and so on. Cu@PIL with a core-shell structure are uniformly dispersed on a graphene substrate, forming a catalyst layer that exhibits a porous structure. This work provides an effective strategy for enhancing the activity and selectivity of C2H4 production in CO2 reduction reaction by optimizing the adsorption/enrichment properties of intermediates. © 2025, The Authors. All rights reserved.

关键词： Hybrid composites

来源：评论

学校读者我要写书评

暂无评论

A review on analytical methods for pharmaceutical and personal care products and their transformation products

引用

Journal of Environmental Sciences 2021年第3期33卷 260-281页

作者： Yuan Meng Weiyi Liu Xiaohui Liu Jinlan Zhang Meng Peng Tingting Zhang Department of Environmental Science and Engineering Beijing Environmental Pollution Control and Resource Engineering Research CenterBeijing University of Chemical TechnologyBeijing 100029China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration State Key Laboratory of Environmental Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China School of Environment Tsinghua UniversityBeijing 100084China

Pharmaceutical and personal care products(PPCPs)and corresponding transformation products have caused widespread concern due to their persistent emissions and potential *** have wide octanol-water partition coefficients(K_(ow))and different ionization constants(pK_(a))resulting in a poor analysis accuracy and efficiency.A suitable analytical method is the first prerequisite for further research on their environmental behavior to prioritize the *** study reviewed a full-scale analytical protocol for environmental samples in the recent ten years:from sampling to instrumental *** sampling techniques were compared and recommended for long-term continuous and scientific observation.A quick and effective sample extraction and clean-up method are highly *** methods coupled to mass spectrometry for determining PPCPs with a wide range of logK_(ow)(-7.53 to 10.80)were summed ***-resolution mass spectrometry was confirmed to be a promising strategy for screening unknown transformation products,which would provide a nanogram level of detection limits and more accurate mass *** strategies and mass change principles were summarized in *** recovery rate was important in multiple contaminants analysis identification and factors affecting the recovery rate of PPCPs were also discussed in this review,including sample matrix,target compounds characteristics,extraction method and solid-phase *** review provides useful information for the selection of appropriate analytical methods and future development directions.

关键词： Pharmaceutical and personal care products Transformation products Passive sampling Extraction High-resolution mass spectrometry

来源：评论

学校读者我要写书评

暂无评论

Investigation of impact of community environment factors on the residents’ visiting rate to outdoor venues in South China

引用

City and Built Environment 2024年第1期2卷 1-24页

作者： Feng, Chao Lou, Siwei Zou, Yukai Huang, Yu State Key Laboratory of Building Safety and Built Environment & National Engineering Research Center of Building Technology Beijing China School of Civil Engineering and Transportation Guangzhou University Guangzhou China School of Architecture and Urban Planning Guangzhou University Guangzhou China

Understanding the activity patterns of urban residents is crucial for urban community design and urban energy forecasting. Predicting the visitation rates of different types of locations is a important issue because urban residents can only be in one place at a time. Achieving accurate predictions of outdoor public space visitation rates is equivalent to predicting the upper limit of the number of visitors to other buildings. Previous similar studies usually rely on survey methods such as questionnaires and GPS positioning. These methods have some drawbacks, such as small sample sizes and inaccurate data. In this paper, we used mobile signaling to investigate the park visit rates of residents in different communities in Guangzhou. In accordance with Chinese tradition, we define a community as a residential community, which consists of multiple residential units and a set of basic service facilities and management structures that are sufficient to meet the daily needs of residents. We found that the park visit rate of a community is closely related to the characteristics of the community itself. The park visit rate is positively correlated with the average LST (land surface temperature) of the communities, the average distance between the community and the large park, and the building coverage rate, while it is negatively correlated with the vegetation coverage rate, the average surface reflection rate, the convenience of transportation, and the per capita green space area. Given the different travel habits of urban residents on weekdays and weekends, we also used multiple linear regression to establish prediction models for community park visitation rates on weekdays and weekends.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

引用

International Journal of Coal Science & technology 2021年第6期8卷 1400-1410页

作者： Minghao Yi Liang Wang Congmeng Hao Qingquan Liu Zhenyang Wang Key Laboratory of Coal Methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116JiangsuChina School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane(CMM),and the sealing depth is a key factor that affects the performance of underground methane *** this work,the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing *** results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m *** sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones,and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic ***,sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing *** these findings,a new CMM drainage system for key sealing in the low-permeability zone was developed that is effective for improving the CMM drainage efficiency and prolonging the high-concentration CMM drainage *** proposed approach offers a valuable quantitative analysis method for selecting the optimum sealing parameters for underground methane drainage,thereby improving considerably the drainage and utilization rates of CMM.

关键词： Coal mine methane Methane drainage Borehole sealing Mining safety Methane utilization

来源：评论

学校读者我要写书评

暂无评论

Stability Analysis of Earth and Rock Dams During the Construction Period of Soft Foundation Reinforcement 9th

Stability Analysis of Earth and Rock Dams During the Constru...

引用

9th International Conference on Civil engineering, ICCE 2022

作者： Li, Jiahao Xu, Jingnan Zhao, Shiwen Wu, Junhua School of Civil Engineering and Architecture Nanchang Hangkong University Jiangxi Nanchang330063 China Key Laboratory of Water Conservancy and Water Transport Engineering Ministry of Education Chongqing Jiaotong University Chongqing400074 China Key Laboratory of Damage Mechanism and Prevention and Control Technology for Earth and Rock Dams Ministry of Water Resources Jiangsu Nanjing210029 China Nanjing Rui Di Construction Technology Co. Ltd Jiangsu Nanjing200120 China

ISBN: (纸本)9789819925315

The consolidation of earth and rock dam foundations and its effect on stability is a key concern in water conservancy and water transportation projects. It is common to use the vacuum combined pre-pressure method to deal with soft ground foundation, where the reasonable selection of soil consolidation coefficient is one of the important factors to determine the success of the project. In this paper, numerical simulation is used to study the strength law of soil and rock dam foundation under different consolidation coefficients of soft ground, and the corresponding stability coefficients of soil and rock dam are obtained. On this basis, the reinforcement effect of an additional counter pressure platform is proposed and analyzed. The results show that the larger the consolidation coefficient of soft ground is, the more it is conducive to the growth of the strength of the soft soil layer and can effectively improve the stability coefficient of the earth and rock dam. At the same time, the additional counter-pressure platform has a certain effect on the overall stability enhancement of the earth and rock dam. The research results can provide a reference for the application of vacuum combined pre-pressure method to earth and rock dam projects. © 2023, The Author(s).

关键词： Rocks

来源：评论

学校读者我要写书评

暂无评论

Vision-Based Autonomous Landing of a Quadrotor UAV on a Double-Layered Nested Landing Marker

Vision-Based Autonomous Landing of a Quadrotor UAV on a Doub...

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Mu, Lingxia Zhang, Yuan Xin, Jing Zhang, Youmin School of Automation and Information Engineering Xi’an University of Technology Xi’an710048 China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi’an University of Technology Xi’an710048 China Department of Mechanical and Industrial Engineering Concordia University MontrealH3G 1M8 Canada

ISBN: (纸本)9789811966125

This paper focuses on the vision-based autonomous landing mission of a quadrotor unmanned aerial vehicle (UAV). A double-layered nested Aruco landing marker is designed which can adapt to the situation that the field of sight of airborne camera changes as the UAV’s altitude decreases during the landing. Then, considering that the landing marker might be obstructed in certain situation, traditional Aruco detection method cannot effectively recognize marker. A YOLOv4 deep learning algorithm is used for marker detection. In addition, to address the problem of false detection in some test results, normalized Wasserstein distance is used to replace the non-maximum suppression to deal with redundant frames. The UAV’s relative location to the marker is then calculated and landing mission is finally achieved by the image-based visual servoing strategy. The simulation on Gazebo demonstrates that the designed marker is effective for the UAV landing mission and the revised YOLOv4 detection algorithm can increase detection results accuracy. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Antennas

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：