检索结果-内蒙古大学图书馆

Nitrogen Pretreatment of Growth Substrates for Vacancy-Saturated MoS2

ACS Applied Materials and Interfaces 2023年第36期15卷 42746-42752页

作者： Yao, Yu-Chi Wu, Bo-Yi Chin, Hao-Ting Yen, Zhi-Long Ting, Chu-Chi Hofmann, Mario Hsieh, Ya-Ping Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Graduate Institute of Opto-Mechatronics Department of Mechanical Engineering National Chung Cheng University Chia-Yi62102 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan

Two-dimensional transition-metal dichalcogenides (2D TMDCs) are considered promising materials for optoelectronics due to their unique optical and electric properties. However, their potential has been limited by the occurrence of atomic vacancies during synthesis. While post-treatment processes have demonstrated the passivation of such vacancies, they increase process complexity and affect the TMDC’s quality. We here introduce the concept of pretreatment as a facile and powerful route to solve the problem of vacancies in MoS2. Low-temperature nitridation of the sapphire substrate prior to growth provides a nondestructive method to MoS2 modification without introducing new processing steps or increasing the thermal budget. Spectroscopic characterization and atomic-resolution microscopy reveal the incorporation of nitrogen from the sapphire surface layer into chalcogen vacancies. The resulting MoS2 with nitrogen-saturated defects shows a decrease in midgap states and more intrinsic doping as confirmed by ab initio calculations and optoelectronic measurements. The demonstrated pretreatment method opens up new routes toward future, high-performance 2D electronics, as evidenced by a 3-fold reduction in contact resistance and a 10-fold improved performance of 2D photodetectors. © 2023 American Chemical Society

关键词： Molybdenum compounds

来源：评论

学校读者我要写书评

暂无评论

Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa_(2)Cu_(3)O_(7-δ)thin films with Y_(2)BaCuO_(5)nanoinclusions

引用

Superconductivity 2024年第1期9卷 95-105页

作者： Alok K.Jha Kaname Matsumoto Tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele Yutaka Yoshida Satoshi Awaji Department of Materials Science and Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Department of Mechanical and Control Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Central Research Institute of Electrical Power Industry YokosukaKanagawa 240-0196Japan College of Engineering-Innovative Global Program Shibaura Institute of TechnologyMinuma-kuSaitama 337-8570Japan Department of Energy Engineering and Science Nagoya UniversityChikusa-kuNagoya 464-8603Japan Institute for Materials Research Tohoku UniversityAoba-kuSendai 980-8577Japan

The pinning of quantized magnetic vortices in superconducting YBa_(2)Cu_(3)O_(7-δ)(YBCO or Y123)thin films with Y_(2)BaCuO_(5)(Y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target *** pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of YBCO+Y211 nanocomposite films.Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of *** the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle *** larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower *** of the temperature dependence of J_(c)for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关键词： YBCO thin film Critical current Vortex pinning Nanoscale APCs

来源：评论

学校读者我要写书评

暂无评论

Developing a Respiratory Pressure Simulation Platform for a Portable Negative Pressure Filtering Chest Drainage System 16

Developing a Respiratory Pressure Simulation Platform for a ...

引用

16th IEEE International Conference on Nano/Molecular Medicine and engineering, NANOMED 2023

作者： Liao, Hao-Yen Chu, Cheng-Shane Wu, Yang-Shun Lin, Sheng-Chieh Lin, Chia-Tsai Hung, Kuo-Yung Ming Chi University of Technology Dept. of Intl. Ph.D Program in Innovative Technology of Biomedical Engineering and Medical Devices Taiwan Ming Chi University of Technology Department of Mechanical Engineering Taiwan Ming Chi University of Technology Research Center for Intelligent Medical Devices Taiwan

ISBN: (纸本)9798350343700

This study aims to reduce the risk of aerosol infection in patients and healthcare workers by establishing a portable negative pressure filtering chest drainage system (PNPFCDS) that filters aerosols and microparticles. By controlling the negative pressure precisely, the system can prevent aerosol transmission under different air leaks. By using a respiratory pressure simulation platform (RPSP), it has been demonstrated that the negative pressure filtering chest drainage system can achieve a minimum measured pressure error of 1.6% without simulated intrapleural pressure changes when the air leak flow rises to 800 ml/min. When the target pressure is -1.5 kPa under simulated intrapleural pressure changes with air leak of 500 ml/min, the measured pressure change rate ranges from -16.7 % to +22.7%. When the target pressure is -9 kPa, the measured pressure change rates ranges from -2% to +6.7%. According to ISO 10079-1, this study provides a model of a negative pressure filtering chest drainage system that is effective and safe. © 2023 IEEE.

关键词： Aerosols

来源：评论

学校读者我要写书评

暂无评论

Numerical study on the wake characteristics of the Savonius turbine for shallow water application in Malaysia 7

Numerical study on the wake characteristics of the Savonius ...

引用

7th International Conference on Applications and Design in mechanical engineering, ICADME 2021

作者： Rajendran, K. Rahman, A. Suhri, G.E. Dass, L. Mechanical Engineering Program Faculty of Mechanical Engineering Technology Universiti Malaysia Perlis Perlis Malaysia

Since Malaysia is a country surrounded by bodies of water, tidal energy is one of the prospects that can be explored for energy extraction potential. While there are several turbine designs and technologies that have been used for tidal energy extraction, information on the use of Vertical Axis Tidal Turbine (VATT) for shallow water applications is very limited, while the implementation of Horizontal Axis Tidal Turbine (HATT) is not suitable due to Malaysia’s ocean depth. Therefore, this paper attempts to address this gap by analyzing the flow characteristics of the VATT in the working environment of shallow water in Malaysia. The first analysis compared the wake characteristics of the Savonius turbine model against a hypothetical ‘actuator’ cylinder, which is a representation of VATT. Next, the second study analyzed the wake characteristics between static and dynamic simulations of a Savonius turbine model. The outputs from this study were validated against previous work in order to gain a better understanding of the wake characteristics of a Savonius turbine. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Wakes

来源：评论

学校读者我要写书评

暂无评论

Photocatalytic bio-inspired PDA-RGO/g-C3N4 nanocomposite incorporated PES membrane for removal of environmental antibiotic pollutants

引用

Journal of Chemical technology and Biotechnology 2024年第6期99卷 1401-1413页

作者： Govardhanan, B. GokulaKrishnan, S.A. Arthanareeswaran, G. Ashok, M. Chen, Yong-Song Taweepreda, W. Membrane Research Laboratory Department of Chemical Engineering National Institute of Technology Tiruchirappalli Tiruchirappalli India New Generation Materials lab Department of Physics National Institute of Technology Tiruchirappalli Tiruchirappalli India Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations National Chung Cheng University Chiayi County Taiwan Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Thailand

BACKGROUND: Membrane technology makes it more suitable for the treatment of environmental polluted organic wastewater. Membrane fouling is one of the major concerns in commercial membranes. To overcome this issue, photocatalytic nanomaterials are embedded into the membrane to enhance its surface nature and reusability. In this investigation, polydopamine functionalized graphene oxide (PDA-RGO), graphite carbon nitride (g-C3N4) and PDA-RGO/g-C3N4 nanomaterials were incorporated within polyethersulfone membrane fabricated via a phase inversion technique. These as-prepared membranes’ functional groups and surface morphologies were investigated by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and field emission electron microscopy (FESEM). These as-prepared membranes were investigated for photocatalytic activity under visible-light-driven photodegradation by environmental pollutants such as Rhodamine B (RhB) and Norfloxacin (NOR). RESULTS: Compared with pristine PES membrane, the PDA-RGO/g-C3N4-PES nanocomposite membrane showed higher photocatalytic activity for Rhodamine B 94.6% and Norfloxacin 96.8%, also reached greater water flux 189 L m−2 h−1. Therefore, the bio-inspired nanocomposite-modified PDA-RGO/g-C3N4 photocatalytic membrane could have huge potential in processing environmentally polluted water. CONCLUSIONS: PDA-RGO/g-C3N4-PES nanocomposite membrane improved the membrane hydrophilicity, water flow, anti-fouling performance, rejection studies and photocatalytic degradation than the pristine membrane. The synergistic result of PDA-RGO and g-C3N4 exhibits better photodegradation efficiency of the membrane towards environmental pollutants. © 2024 Society of Chemical Industry (SCI). © 2024 Society of Chemical Industry (SCI).

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Loss Balancing for Physics-Informed Neural Networks Considering Procedure for Solving Partial Differential Equations

Loss Balancing for Physics-Informed Neural Networks Consider...

引用

International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： Manabu Kojima Kazuma Otsuki Masato Suzuki Masajiro Abe Masaaki Baba Kazuya Yokota Master's Program in Mechanical Engineering Nagaoka University of Technology Nagaoka Japan Department of System Safety Engineering Nagaoka University of Technology Nagaoka Japan Department of Mechanical Engineering Nagaoka University of Technology Nagaoka Japan

ISBN: (数字)9798350373332

ISBN: (纸本)9798350373349

With the development of machine learning, numerical analysis using neural networks has been devised. Remarkably, physics-informed neural networks (PINNs) enable physically consistent numerical analysis by introducing a loss function that conforms to relevant governing equations. Moreover, research is rapidly advancing for the application of PINNs to inverse analysis in areas such as physical property identification. For a PINN to learn governing equations, the weights of the loss functions should be properly determined because they have different roles in components such as boundary conditions, initial conditions, and governing equations. However, weight setting is generally challenging. We propose a loss balancing method considering the procedure for solving partial differential equations. The proposed method is validated through comparisons with conventional solvers.

关键词： Training Heating systems Numerical analysis Partial differential equations Neural networks Manuals Machine learning Object recognition MATLAB Convergence

来源：评论

学校读者我要写书评

暂无评论

Investigation of Operating Temperature as a Key Factor in Determining Photovoltaic Module Cooling Specifications 4

Investigation of Operating Temperature as a Key Factor in De...

引用

4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Supriyono, Toto Omar, Ghazali Tamaldin, Noreffendy Ariantara, Bambang Yamin, Mohammad Sumartono, Muhammad Rizki Wati, Dian Anisa Rokhwah Faculty of Mechanical Technology and Engineering UTeM Melaka76100 Malaysia Program Studi Teknik Mesin Universitas Pasundan Bandung40153 Indonesia Program Studi Teknik Mesin Universitas Gunadarma Depok16424 Indonesia Progam Studi Teknik Mesin Universitas Hasyim Asy’ari Tebuireng Jombang Indonesia

Many studies have shown that the temperature of photovoltaic modules (PVM) significantly affects their performance. An effective thermal management system is required to maintain optimal efficiency. This investigation is part of an ongoing study on PVM thermal management that aims to maintain the PVM power output at high temperatures, that is, above 30oC. To design an efficient cooler, it is important to determine the operating temperature range of the PVM. This study focused on measuring the temperature of the back surface of a PVM with a capacity of 120 W using a thermocouple connected to a temperature data logger. Measurements were carried out in 3 (three) stages to improve the operating temperatures' accuracy, accuracy, and trend. The first phase was carried out in September, October, November 2020, July 2021, and June 2023, from 6:00 am to 6:00 pm. The measurement was in the parking area on the second floor of the Faculty of engineering, Pasundan University, Bandung. The results of the 3rd phase of the investigation revealed that the rear surface temperature ranged from 19°C in the morning at 06:00 to a peak of 64.5°C at 12:15 when the irradiance reached 535 W/m2. Then, the temperature gradually drops to approximately 30°C at 17:00 and drops back to approximately 24°C at sunset. Based on these findings, the optimal operating temperature range for PVM chillers is 30°C to 70°C, providing important data as a cooling design parameter. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Cooling systems

来源：评论

学校读者我要写书评

暂无评论

Direct Teaching/Playback Method for the Contact Task of a Six-DOF Manipulator Using a Parallel-Wire-Type Teaching Device with a Remote Center Compliance Device 23

Direct Teaching/Playback Method for the Contact Task of a Si...

引用

23rd International Conference on Control, Automation and Systems, ICCAS 2023

作者： Okochi, Tatsuya Sakai, Masao Morita, Yoshifumi Graduate School of Engineering Nagoya Institute of Technology Electrical and Mechanical Engineering Program Department of Engineering Gokiso-cho Aichi Nagoya466-8555 Japan Industrial Research Center Aichi Center for Industry and Science Technology Onda-cho 1-157-1 Aichi Kariya-shi448-0013 Japan Nagoya Institute of Technology Department of Electrical and Mechanical Engineering Gokiso-cho Showa-ku Aichi Nagoya466-8555 Japan

ISBN: (纸本)9788993215274

This study proposes a direct teaching method for the task of pressing an end effector attached to a robot manipulator against a workpiece with a constant force. When performing contact tasks, such as deburring or polishing using a manipulator, a passive compliance is required for the end effector to suppress excessive contact force and impact. Therefore, we developed an end effector that combines a 'parallel wire-type teaching device,' which enables direct teaching, and a compliance device. In the case of pressing a workpiece with a constant force, after teaching the robot's trajectory to trace the edge of the workpiece, the amount of pressing can be calculated from the stiffness of the end effector and the desired pressing force;the robot's trajectory can be edited to teach contact tasks. An experiment was conducted to press a straight trajectory with a constant force as the target value and evaluate the accuracy of force teaching. © 2023 ICROS.

关键词： End effectors

来源：评论

学校读者我要写书评

暂无评论

Folding angle and wing flexibility influence the flight performance of origami winged fruits

引用

Nonlinear Dynamics 2024年第13期112卷 10995-11011页

作者： Cai, Jing-Fang Hsu, Ya-Chun Yen, Yu-Chen Lee, Yun-Chung Peyton, Bernie Huang, Mei-Jiau Yu, Hon-Tsen Juang, Jia-Yang Department of Mechanical Engineering National Taiwan University Taipei106319 Taiwan Department of Life Science National Taiwan University Taipei106319 Taiwan Berkeley CA United States Program in Nanoengineering and Nanoscience Graduate School of Advanced Technology National Taiwan University Taipei106319 Taiwan Degree Program of Genome and Systems Biology National Taiwan University Taipei106319 Taiwan

Winged fruits possess a unique flight mechanism relying on simple geometric structures rather than neuromuscular control. This study proposes an innovative approach using origami techniques to create three-winged model fruits, serving as a proxy for understanding the flight dynamics of natural winged fruits. Paper is employed to simulate inherent wing flexibility, with the option to add plastic frames for rigidity. We comprehensively investigate the free fall motion of both rigid and flexible winged fruits through experimental and numerical analyses. Velocity–time curves reveal a three-stage descent pattern—acceleration, deceleration, and steady states. The overshoot phenomenon is attributed to rapid lift increase due to leading-edge vortices attaching stably to the wings. This insight sheds light on aerodynamics governing fruit flight. Compared with rigid wings, flexible wings exhibit two key properties—slower descent and higher self-orienting capability—that facilitate a more stable and longer-distance dispersal of seeds under crosswind conditions. Our study demonstrates the potential benefits of flexible wings in natural seed distribution. This study advances our understanding of winged fruit flight dynamics, utilizing origami as a powerful tool for biomimetic investigations. The findings have broad implications, from improving aerodynamic designs to developing efficient micro air vehicles and electronic microfliers, and understanding seed dispersal evolution. Graphical abstract: (Figure presented.). © The Author(s), under exclusive licence to Springer Nature B.V. 2024.

关键词： Fruits

来源：评论

学校读者我要写书评

暂无评论

Behavior-Based Control with Learning from Demonstration for Path Following Applied to Mobile Robots Soccer

Behavior-Based Control with Learning from Demonstration for ...

引用

IEEE Latin American Robotics Symposium, LARS

作者： Matheus de S. Luiz M. A. Pastrana Guilherme Achilles de Oliveira e Aguiar R. B. Costa Luiz F. Rodrigues e Silva Faculty of Gama Electronics Engineering Undergraduate Program Department of Mechanical Engineering Mechatronics Graduate Program Faculty of Technology Mechatronics Engineering Undergraduate Program Faculty of Gama Aerospace Engineering Undergraduate Program University of Brasilia Brasilia DF Brazil

ISBN: (数字)9798331508807

ISBN: (纸本)9798331508814

Learning from Demonstration (LfD) enables robots to learn new tasks through an imitation process. This methodology can be combined with Behavior-Based Control (BBC), which facilitates the abstraction of behaviors for the robot by dividing them into micro-behaviors. These can be implemented using Artificial Neural Networks trained by bio-inspired algorithms. In this work, a novel methodology based on the LfD and BBC methods is proposed for controlling soccer robots, specifically for the Very Small Size Soccer (VSSS) category, which demands quick and dynamic responses. Simulations using CoppeliaSim were conducted to demonstrate how the proposed methodology can be used for path planning and path-following problems in the IEEE VSSS category.

关键词： Measurement Training Heuristic algorithms Artificial neural networks Turning Robustness Path planning Robots Optimization Sports

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：