检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Zhang, Xiaoyu Zhang, Shuhui Fang, Le Zhang, Cheng Li, Xia Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University Zhuhai Campus Zhuhai519087 China Advanced Institute of Natural Sciences Beijing Normal University Zhuhai Campus Zhuhai519087 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Zhuhai Campus Beijing100875 China Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guang-dong Higher Education Institutes Beijing Normal University Zhuhai Campus Zhuhai519087 China Instrumentation and Service Center for Science and Technology Beijing Normal University Zhuhai Campus Zhuhai519087 China

With the rapid social-economic development, anthropogenic activities affect global climate change and water quality of lake ecosystems. However, little is known about how nutrients respond to changes in social-economic and climate change over a long period. In this study, we used the long-term dataset (1987-2021) of Poyang Lake to perform a powerful interpretative modeling. During 1978~2021, the filtering trajectory method (FTM) suggested that Poyang Lake has experienced the nutrients increased first then decreased stages under the social-economic development and climate change. Additionally, the filtering trajectory of nutrients and drivers also supported the detection of the change point in the temporal dynamic. The structural equation modeling (SEM) of nutrients revealed that social-economic factors rather than climate change determined the long-term change of TN and TP. GDP, Urbanization (Ur), and P-fertilizer (Pfer) were the key drivers of TN;Urbanization, population, and sewerage treatment rate (STR) were the primary factors of TP. Through the generalized additive models (GAMs), we observed that GDP accounted for 86 % of the temporal variability in TN and 45.7 % in TP, exhibiting inverted U-shaped relationships with both TN and TP. Air temperature (AT), as a climatic factor only accounted for 44.6% and 14.8 % of TN and TP, respectively. Pfer explained 66.0% variations of TN, demonstrating the decline of Pfer application is suitable for controlling nonpoint pollution. In addition, STR explained 50.4% variations of TP with a peaked TP at STR threshold around 80%. Our findings highlight that Pfer and STR were essential indicators for nutrient management. This study provides an important understanding of how lake nutrients may respond to social dynamics and climate warming over a long period. Collaborative control strategies for water pollution and carbon reduction can contribute to mitigating future climate change. © 2024, The Authors. All rights reserved.

关键词： Nutrients

来源：评论

学校读者我要写书评

暂无评论

A New SINS/USBL Integration Navigation with the Unknown Position of the Transponder

A New SINS/USBL Integration Navigation with the Unknown Posi...

引用

International Conference on Robotics and Automation Engineering (ICRAE)

作者： Maodong Xia Tao Zhang Liang Zhang Bo Yang School of Instrument Science & Engineering Southeast University Nanjing China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education Southeast University Nanjing China Interdisciplinary Division of Aeronautical and Aviation Engineering Hong Kong Polytechnic University Hong Kong China

Autonomous underwater vehicles (AUV) are viewed as the carrier for marine resource exploitation and utilization, which need accurate navigation information. The main navigation mode of AUV is based on the strap-down inertial system (SINS), assisted by the ultra-short baseline system (USBL). Traditional SINS/USBL integration navigations are under the assumption that the precise position of the transponder is obtained in advance by the long baseline system (LBL), which increases the complexity of system operations. Therefore, a new integration navigation with the unknown position of the transponder is proposed. State vectors are augmented, which additionally contain the position errors of the transponder. Modified state and measurement equations are established, respectively. The optimal position errors of AUV and the transponder are got simultaneously by the Kalman filter. The mathematical simulation is performed to show the superiority of the proposed algorithm.

关键词： Autonomous underwater vehicles Automation Navigation Systems operation Filtering algorithms Mathematical models Calibration

来源：评论

学校读者我要写书评

暂无评论

Weavable Yarn-Shaped Supercapacitor in Sweat-Activated Self-Charging Power Textile for Wireless Sweat Biosensing

SSRN

引用

SSRN 2023年

作者： Xiao, Gang Ju, Jun Li, Min Wu, Huajun Jian, Yihao Sun, Wei Wang, Wei Li, Chang Ming Qiao, Yan Lu, Zhisong Institute for Clean Energy & Advanced Materials School of Materials & Energy Southwest University Chongqing400715 China Sino-Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials & Energy Southwest University Chongqing400715 China Experimental Center for Virtual Simulation of Sports and Health Southwest University Chongqing400715 China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical Engineering Hainan Normal University Haikou571158 China Singapore Institute of Manufacturing Technology Singapore138669 Singapore School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China

The yarn-based sweat-activated battery (SAB) is a promising energy source for textile electronics due to its excellent skin compatibility, great weavability, and stable electric output. However, its power density is too low to support real-time monitoring and wireless data transmission. Here, we developed a scalable, high-performance sweat-based yarn biosupercapacitor (SYBSC) with two symmetrically aligned electrodes made by wrapping hydrophilic cotton fibers on polypyrrole/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)-modified stainless steel yarns. Once activated with artificial sweat, the SYBSC could offer a high areal capacitance of 343.1 mF cm−2 at 0.5 mA cm−2. After 10,000 times of bending under continuous charge-discharge cycles and 25 cycles of machine washing, the device could retain the capacitance at rates of 68% and 73%, respectively. The SYBSCs were integrated with yarn-shaped SABs to produce hybrid self-charging power units. The hybrid units, pH sensing fibers, and a mini-analyzer were woven into a sweat-activated all-in-one sensing textile, in which the hybrid, self-charging units could power the analyzer for real-time data collection and wireless transmission. The all-in-one electronic textile could be successfully employed to real-time monitor the pH values of the volunteers’ sweat during exercise. This work can promote the development of self-charging electronic textiles for monitoring human healthcare and exercise intensity. © 2023, The Authors. All rights reserved.

关键词： Yarn

来源：评论

学校读者我要写书评

暂无评论

Scalable, High-Performance, Yarn-Shaped Batteries Activated by an Ultralow Volume of Sweat for Self-Powered Sensing Textiles

SSRN

引用

SSRN 2023年

作者： Ju, Jun Xiao, Gang Jian, Yihao Wu, Liang Sun, Wei Wang, Wei Li, Chang Ming Qiao, Yan Lu, Zhisong Institute for Clean Energy & Advanced Materials School of Materials & Energy Southwest University Chongqing400715 China Sino-Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials & Energy Southwest University Chongqing400715 China Experimental Center for Virtual Simulation of Sports and Health Southwest University Chongqing400715 China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical Engineering Hainan Normal University Haikou571158 China Singapore Institute of Manufacturing Technology Singapore138669 Singapore School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China

One-dimensional sweat-activated batteries (SABs) provide a practical solution to generating enough electricity for textile electronics due to their excellent flexibility, biocompatibility, and compatibility with conventional textile techniques. However, the low power outputs and slow, inefficient activation during the initial perspiration stage greatly hamper their applications in textile-based, self-powered sensing systems. To address this issue, we developed a core-sheath-structured sweat-activated yarn battery (SAYB) with a Zn-wire core, a cotton-yarn sheath, and an outermost carbon yarn that served as the anode, sweat-wicking separator, and cathode, respectively. The battery has a power density of 1.72 mW cm−2 and an energy capacity of 15.3 mAh, which are much greater than those of the previously reported cotton-yarn-based SAB. The SAYB could be activated by only 1 μL of 100 mM NaCl solution within 3 seconds, thanks to the thin, hydrophilic cotton sheath, which may shorten the distance and accelerate liquid penetration between the electrodes. The batteries could be bent for 10,000 times, twisted for 2,800 times, and washed for 20 times without significantly reducing their power outputs. Multiple batteries connected in proper configurations could power headlights or charge portable gadgets like a smart watch and a smart phone. The SAYB was produced on a large scale (60 meters long) to create a sweat-activated energy fabric (5 meters long and 0.5 meters wide) using conventional weaving techniques. The fabric was further combined with mini wireless analyzers and strain-sensing yarns to prepare a self-powered sensing T-shirt. The T-shirt can be triggered to wirelessly monitor the arm swing frequency and breathing rate in real time after wicking up the sweat created by a volunteer while he is jogging. The SAYBs are expected to contribute to the production of self-powered smart garments for wearable healthcare and exercise monitoring as reliable one-dimensional power

关键词： Smartphones

来源：评论

学校读者我要写书评

暂无评论

Scalable, High-Performance, Yarn-Shaped Batteries Activated by an Ultralow Volume of Sweat for Self-Powered Sensing Textiles

SSRN

引用

SSRN 2023年

关键词： Smartphones

来源：评论

学校读者我要写书评

暂无评论

Scalable, High-Performance, Yarn-Shaped Batteries Activated by an Ultralow Volume of Sweat for Self-Powered Sensing Textiles

SSRN

引用

SSRN 2023年

关键词： Smartphones

来源：评论

学校读者我要写书评

暂无评论

Revisiting mid-long term ecosystem services projections: Integrating the interaction effects of future climate and land use changes

引用

Fundamental Research 2024年

作者： Yang, Qing Liu, Gengyuan Gonella, Francesco Wang, Qingrui Chen, Shiju Yang, Zhifeng Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University Zhuhai 519087 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Department of Molecular Sciences and Nanosystems Ca’ Foscari University of Venice Venezia Mestre 30170 Italy State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China Beijing Tengjing Big Data Research Institute Beijing 100020 China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou 510006 China

Two of the most critical issues of sustainability are how future ecosystem services (ES) will change under natural and artificial stressors. To answer the above problems accurately with a quantitative manner and develop an intelligent and sustainable management of ecosystems, the projections of ES considering climate change under different Shared Socioeconomic Pathways (SSPs) are needed. However, current ES projection studies often lack quantitative methods to simulate ES dynamics, especially incapability to integrate the interactions between climate and land use changes on ES dynamics. To overcome these challenges, this study proposes a framework for ES simulation under climate and land use change stressors. The framework developed includes four modules: climatic attributes simulation, land use change simulation, scenario design, and ecosystem services simulation modules. Taking China as a case study, this study simulated the evolution of China's ES under the interactions between climate and land use change during the period of 2020–2100. The simulation results show that China's ES increases by 33%, 34%, 9%, and 60% under scenarios SSP1, SSP2, SSP3, and SSP5, respectively. Additionally, the overall growth rate of ES decreases by a gradually slowing rate from the mean at 1% during 2000–2020 to 0.5% during 2020–2100, respectively. Meanwhile, the ES in China shows significantly spatial variability based on simulation results. Shandong province yields the largest potential to be the key area with ES declining in the future. At ecosystem scale, increases in woodland ES are expected to dominate China's ES growth continuously. In the first four decades (2020–2060), development ways under SSP1 scenario are more helpful to promote increase in subtypes of ES, while in the last four decades (2060–2100), ES are expected to increase under SSP5 scenario. The key contributions of this study include tracking the causation and revealing the influencing mechanism of interactions of

关键词： Climate change Ecosystem conservation and management Ecosystem services Land use change Shared socioeconomic pathways (SSPs)

来源：评论

学校读者我要写书评

暂无评论

引用

Nanomanufacturing and Metrology 2020年第2期3卷 123-132页

作者： Zhanfeng Wan Junjie Zhang Guo Li Zongwei Xu Haijun Zhang Jianguo Zhang Alexander Hartmaier Fengzhou Fang Yongda Yan Tao Sun Center for Precision Engineering.Harbin Institute of Technology Harbin 150001People's Republic of China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900People's Republic of China State Key Laboratory of Precision Measuring Technology&Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University Bochum44780 BochumGermany

Deformation behavior at grain levels greatly affects the machining characteristics of crystalline *** the present work,we investigate the influence of material anisotropy on ultra-precision diamond cutting of single crystalline and polycrystalline copper by experiments and crystal plasticity finite element ***,diamond turning and in situ SEM orthogonal cutting experiments are carried out to provide direct experimental evidence of the material anisotropy-dependent cutting results in terms of machined surface morphology and chip *** numerical simulations with the analysis of built stress further validate experimental results and reveal the mechanisms governing the material anisotropy *** above findings provide insight into the fabrication of ultra-smooth surfaces of polycrystalline metals by ultraprecision diamond turning.

关键词： Diamond cutting Polycrystalline copper Anisotropy Grain boundary Crystal plasticity finite element

来源：评论

学校读者我要写书评

暂无评论

Improving Mechanical and Wear Properties of Multiphase M50 Steel by Tailoring Bainite Morphology

SSRN

引用

SSRN 2022年

作者： Du, Yuchen Qian, Dongsheng Ren, Haichao Wu, Min Wang, Feng Hubei key Laboratory of Advanced Technology for Automotive Components Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Engineering Research Center for Green Precision Material Forming Wuhan430070 China Aecc Guizhou Liyang Aviation Power Co. Ltd. Guizhou557300 China

The bainite/martensite multiphase microstructure has shown excellent strength-toughness matching compared with the traditional martensitic microstructure. The ratio of martensite to bainite has always been the focus of performance optimization for the multiphase microstructure. However, the effect of bainite morphology on mechanical properties and wear properties remains unknown. In this work, the microstructure, mechanical and wear properties of M50 steel with different bainite morphologies have been investigated. The austempering parameters were designed to obtain the similar bainite fraction (around 10%) and different bainite morphologies. The microstructure characterization shows that the properly introduced lower bainite can significantly refine the lath structure due to the significant microstructure segmentation effect. When the bundle width and length of lower bainite are respectively 0.107 μm and 3.758 μm, the finest lath microstructure is obtained considering the balance of martensite growth space. As well, the mechanical properties results show that the toughness increases without loss of strength under the tailored bainite. The high temperature wear performance shows that the multiphase microstructure with tailored bainite results in the decrease of friction coefficient by 42% and a decline of wear loss by 37.9% due to the optimized lubrication layer. This work provides a novel perspective to further improve the mechanical and wear properties of multiphase M50 steel by finely tailoring the bainite morphology on the basis of fixed bainite content. © 2022, The Authors. All rights reserved.

关键词： Bainite

来源：评论

学校读者我要写书评

暂无评论

An Application of Cognitive Workload and Situational Awareness Assessment in Human Safety Demonstration of NPP

An Application of Cognitive Workload and Situational Awarene...

引用

System Reliability and Safety Engineering (SRSE), International Conference on

作者： Zhihui Xu Hang Liu Can Zhou Yunqing Gao Jipu Wang Yuxin Zhang Jun Yang Ming Yang Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin China State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co. Ltd. Shenzhen China Institute for Advanced Study in Nuclear Energy & Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China School of Electrical Power South China University of Technology Guang Zhou China

This paper provides a brief summary of cognitive workload and situational awareness assessment methodologies that are available to support nuclear power plant human factors assessment and validation activities. These methodologies are reviewed in respect to their strengths and weakness in supporting the ongoing/future human factors program for the NPP project. This paper also describes how the assessment of cognitive workload and situational awareness is an integral aspect of the work to substantiate human safety claimed in NPP. However, these methodologies require more detailed design and operating information of the NPP project. Due to the unavailability of detailed design information and operating procedures required for high fidelity task simulation in design stage, cognitive workload and situation awareness are assessed through the assessment of related Performance Shaping Factors through human reliability method.

关键词： Psychology Human factors Hafnium Reliability engineering Safety Task analysis Power generation

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：