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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Wang, Ruixuan Homa, Daniel Dejneka, Zach Theis, Logan Wang, Anbo Pickrell, Gary Center for Photonics Technology The Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA United States Center for Photonics Technology Department of Material Science and Engineering Virginia Tech BlacksburgVA United States

Introducing a dual Fabry-Perot sensor system for non-contact pipe burst monitoring. With a lab-standard dual-ferrule probe, we measure absolute distance from the pipe and differentiate bursting events from absolute dr... 详细信息

关键词： Fabry-Perot interferometers

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Flexible free-standing composite films including skeleton-structures of hollow graphene ellipsoids 23

Flexible free-standing composite films including skeleton-st...

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23rd International Conference on Composite materials, ICCM 2023

作者： Lee, Eun Goo Lee, Jonghwi Lee, Sang-Soo Soft Hybrid Materials Research Center Korea Institute of Science and Technology Seoul Korea Republic of Department of Chemical Engineering and Material Science Chung-Ang University Seoul Korea Republic of

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Inbound Supply Chain Risk Management: A Case Study From an Automotive Manufacturing Firm

Inbound Supply Chain Risk Management: A Case Study From an A...

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2023 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2023

作者： Imran, J.A. Ratnayake, R.M.C. Okdinawati, L. School of Business and Management Institut Teknologi Bandung Bandung Indonesia University of Stavanger Department of Mechanical and Structural Engineering and Material Science Stavanger Norway

ISBN: (纸本)9798350323153

Supply chain (SC) risks significantly impact manufacturers, affecting their operations, finances, and business activities. The lead time to arrive of raw material is a critical measure in the inbound SC. This study aims to develop a risk matrix to assess inbound SC risks, thereby enabling predictions of potential for failures and taking proactive measures. Using a case study in an automotive manufacturer and data from a logistics expert interview, the Mean Time to Arrival (MTTA) is identified as a measure for the probability of failure (PoF). The consequences of potential failure (CoFs) consider 'undesirable MTTA' and are classified into quantitative (e.g., production stoppages and man-hour losses) and qualitative (e.g., client loss and goodwill) aspects. The study developed a risk matrix to show the interrelationship among PoFs, CoFs, and the corresponding risk levels. It also identified recommended actions for various risk levels and presented an illustrative SC risk assessment. This paper provides practical guidelines for effective inbound SC risk management in manufacturing, aiding decision makers in informed decision-making and enhancing their operations. © 2023 IEEE.

关键词： automotive industry inbound supply chain risk matrix supply chain risk management

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Precision control and performance of new-generation integrated fiber positioners for LAMOST 2

Precision control and performance of new-generation integrat...

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Advanced Optical Manufacturing Technologies and Applications 2022, AOMTA 2022 and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2022

作者： Zhang, Zhen Chen, Guifeng Zhu, Mengjie Gu, Yonggang Zhai, Chao Department of Precision Machinery and Precision Instruments University of Science and Technology of China Anhui Hefei230027 China Experiment Center of Engineering and Material Science University of Science and Technology of China Anhui Hefei230027 China

ISBN: (纸本)9781510661264

An improvement project of LAMOST will be implemented soon. To improve the observation accuracy and spectral acquisition rate, a new integrated fiber positioner was designed for the new robotic Focal Plane System. This paper designs the drive system for the integrated fiber positioner, and introduces the mechanical, electronic and software design in detail. We also built a vision measurement platform with a telecentric lenses to test the position performance. The fiber positioner positions the fiber to target by first blind positioning and multiple position corrections. After the positioner completes the first blind move, the camera takes the fiber image and calculates the offset between the actual position of the fiber from its target position. Then, the drive system controls the fiber positioner move according the offset value to correct the fiber position. We achieve the final accuracy through iterative position corrections. Experimental results show that both the drive system and the fiber positioner have reliable performance and high efficiency. With a first blind move inside of its workspace, the positioner can position the fibers with a planar precision better than 100um, the position error is less than 10um after the second correction and the RMS error is less than 3um. © 2023 SPIE.

关键词： Software design

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Towards Autonomous Shooting Rover via Situation Aware Visual-Perception and Dynamic Action Execution

Towards Autonomous Shooting Rover via Situation Aware Visual...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Chikoti, Shreenaga Shubham Seelam, Yukkta Jain, Aditya Mehta, Nishi Watsa, Sidhartha Ranjan, Ayush Behera, L. Indian Institute of Technology Kanpur Department of Mathematics and Scientific Computing India Indian Institute of Technology Kanpur Department of Material Science and Engineering India Indian Institute of Technology Kanpur Department of Electrical Engineering India Indian Institute of Technology Kanpur Department of Computer Science and Engineering India Indian Institute of Technology Kanpur Department of Mechanical Engineering India

ISBN: (纸本)9798350312072

In this system paper, we present our approach to the DJI Robomaster AI Challenge, 2022 where our team ERA-IITK was ranked 3rd worldwide among 83 teams. We primarily focus on system hardware design and algorithmic components to achieve full autonomy. We first detail the hardware infrastructure, including intricate details on sensors and communication setup. Then we comprehensively describe our algorithmic pipeline and a state machine based on them to realize an autonomous system. Our major novelty is the high-speed and accurate visual perception module for target detection, and high-speed self-localization to maximize the likelihood of a target being shot. Our research endeavor in this paper can serve as a foundation for more complex systems and holds immense potential for various real-world applications. © 2024 IEEE.

关键词： Vision

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Bridgman growth and characterization of langanite(La_3Ga_(5.5)Nb_(0.5)O_(14),LGN)single crystal

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Journal of Rare Earths 2025年第3期43卷 584-590,I0006页

作者： Chengkai Ren Libin Yin Shuai Wang Weirong Chen Sheng Wang Kainan Xiong Xiaoniu Tu Ningzhong Bao Yanqing Zheng Jun Chen Erwei Shi Institute of Ceramics Chinese Academy of SciencesShanghai201800 China State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China The State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China College of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing100083China Hainan University Haikou570228China

As a promising optical and piezoelectric crystal,efficient growth of LGN single crystal is crucial for its practical ***,a langanite(La_(3)Ga_(5.5)Nb_(0.5)O_(14),LGN)crystal with high quality was successfully grown by the Bridgman method along the Z *** order to prepare high-purity polycrystalline precursors for LGN crystal growth,the sintering conditions of LGN polycrystalline precursors were studied in *** melting point of LGN was also measured to provide a reference for the crystal growth *** the[001]oriented wafer,the full width at half maximum(EWHM)value of the nigh-resolution X-ray diffraction(HRXRD)analysis is 38.52",demonstrating that the LGN crystal exhibits excellent crystalline *** addition,we also measured the thermal properties and transmission spectrum of the as-grown LGN *** is found that the absorption peak at 1.85μm of the LGN crystal grown in air using the Bridgman method disappears compared with previous reports(grown in N_(2+)(1-3)vol%O_(2)atmosphere),which is attributed to the oxygen-enriched growth *** phenomenon also occurs in other LGS-type disordered *** is believed that these findings may expand the potential applications of LGS series crystals at 1.85μm.

关键词： Langanite Rare earths Bridgman method Oxygen-enriched growth Optical materials

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Converting poly(ethylene terephthalate) waste into N-doped porous carbon as CO_(2) adsorbent and solar steam generator

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Green Energy & Environment 2022年第3期7卷 411-422页

作者： Changyuan Song Boyi Zhang Liang Hao Jiakang Min Ning Liu Ran Niu Jiang Gong Tao Tang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Materials Science&Engineering National University of Singapore9 Engineering Drive 1Singapore117576Singapore State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Sustainable conversion of waste plastics into valuable carbon materials for diverse applications provides a promising strategy to dispose the municipal and industrial waste ***,it remains a challenge to precisely control the crosslinking reaction for transforming waste polyesters into N-doped porous carbon (NPC) with well-defined ***,we put forwards a strategy of stepwise crosslinking using melamine and ZnCl_(2)/NaCl eutectic salts to convert poly (ethylene terephthalate)(PET) into NPC at 550℃.We prove that firstly melamine reacts with PET degradation products to form a crosslinking structure,and subsequently ZnCl_(2)/NaCl promote the dehydration and decarboxylation of the crosslinking structure to generate a more thermally stable crosslinking *** coordination of two tandem crosslinking reactions is critical to control the microstructure of *** activations,NPC shows large specific surface area of 1173 m~2g^(-1),abundant N dopants,and rich oxygen-containing *** combined features endure NPC with excellent performance in CO_(2) capture and solar steam generation,e.g.,high CO_(2) adsorption capacity of 6.47 mmol g^(-1) and evaporation rate of 1.62 kg m^(-2)h^(-1).More importantly,NPC is compared to or prevails over previous carbon-based CO_(2) adsorbents or photothermal *** work will advance the research on “green” reutilization of low-cost polyester wastes to prepare sustainable carbon for solar energy conversion,environmental protection,etc.

关键词： adsorbent crosslinking polyester

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Effect of testing temperature on the impact-sliding wear behaviour of a 316L austenitic stainless steel

Effect of testing temperature on the impact-sliding wear beh...

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作者： Gumuslu, Tufan Kaba, Mertcan Atar, Erdem Cimenoglu, Huseyin Department of Material Science and Engineering Gebze Technical University Gebze Kocaeli 41400 Turkey Department of Metallurgy and Materials Engineering Istanbul Technical University Maslak Istanbul34469 Turkey

In this study impact-sliding wear performance of a 316L austenitic stainless steel (ASS), having widespread usage in various engineering applications under complex loading conditions, has been examined at room temperature (RT) and 180 °C under contact pressures as high as 2.5 GPa. Impact-sliding wear tests were carried out against 10 mm diameter 52100 grade bearing steel balls for 1000 loading cycles. The wear tracks formed on the samples were then examined by a 2-D contact profilometer, an energy dispersive X-ray spectroscopy (EDX) equipped scanning electron microscope (SEM) and a Raman spectroscopy. Despite the detection of tribo-oxides on the impact and sliding zones, mainly plasticity dominated wear was operative at RT. Tests conducted at RT and 180 °C favoured hematite + magnetite and hematite type tribo-oxides on the worn surface, respectively. The increase of test temperature to 180 °C caused an increase in the wear rate at the impact zone but a decrease at the sliding zone of the wear track. While the former was the result of softening of the ASS, the latter was due to the formation of thicker tribo-oxides on the contact surface. Although the reduction of sliding wear rate above a critical temperature (300–400 °C) was previously associated with the formation of protective tribo-oxides on the worn surfaces, this study revealed that higher contact pressure reduces this critical temperature via increasing the frictional heating under sliding contact. Thus, contact pressure of 2.5 GPa favoured the formation of protective tribo-oxides at a lower temperature (i.e. 180 °C) for the examined ASS/bearing steel tribo-pair. © 2023

关键词： Austenitic stainless steel

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Accurate regulation of carbon skeletons bonded to Fe-N_(4)single atom nanozymes for efficient generation of reactive oxygen species

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science China Chemistry 2025年第3期68卷 1067-1077页

作者： Fuchun Nan Qilin Wei Tongtong Kou Yuxuan Zhao Lanbo Shen Dawei Li Tong Chang Lingyun Wang Fangfang Lang William W.Yu School of Chemistry and Chemical Engineering Ministry of Education Key Laboratory of Special Functional Aggregated MaterialsShandong Key Laboratory of Advanced Organosilicon Materials and TechnologiesShandong UniversityJinan 250100China Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy ConversionShandong UniversityQingdao 266237China Department of Urology Qilu Hospital of Shandong UniversityJinan 250063China Jinan Central Hospital Shandong First Medical UniversityJinan 250013China School of Integrated Circuits Shandong UniversityJinan 250101China Shandong Provincial Maternal and Child Health Care Hospital Qingdao UniversityJinan 250014China

Rational design of single atom nanozymes(SAzymes)could be achieved through the accurate configuration regulation of metal coordination sites,nevertheless,the un-defined carbon environment of traditional SAzymes synthesized by high-temperature pyrolysis makes it difficult to unveil the influence of carbon skeletons with enzyme mimicking activities of ***,we investigated the relationship between the carbon skeletons and the enzyme mimicking activities through the construction of a series of fullyπ-conjugated covalent organic polymer(COP)-based SAzymes with analogous Fe-N_(4)*** experimental results and theoretical calculations demonstrated that carbon skeletons bonded to the Fe-N_(4)catalytic sites strongly affect the enzyme mimicking activities of COP *** the number of benzene rings in carbon skeletons was 1,the COP SAzyme possessed much more remarkable oxidase(OXD)and peroxidase(POD)mimicking activities,and further reducing or increasing the benzene rings would dramatically inhibit the enzyme mimicking ***,the fantastic enzyme mimicking activity of COP-1 could be applied to colorimetric detection of biological molecules and degradation of *** results provide a new perspective for the rational fabrication of SAzymes with high catalytic efficiency.

关键词： single atom nanozyme covalent organic polymer carbon skeleton reactive oxygen species generation

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Thermodynamics and Band Structure of ScxAl1-xN

Thermodynamics and Band Structure of ScxAl1-xN

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2022 Compound Semiconductor Week, CSW 2022

作者： Molla, Mahlet Kioupakis, Emmanouil University of Michigan Department of Material Science and Engineering Ann ArborMI48109 United States

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

ScxAl1-xN alloys at certain compositions have enhanced piezoelectric response which allows the coercive electric field for ferroelectric polarization switching to be below its dielectric breakdown limit. Therefore, the strain and polarization tunability of ScxAl1-xN would grant further applications in electronic and optoelectronic devices that would not be possible with AlN. In this work, we performed first-principles calculations based on hybrid density functional theory (DFT) and special quasi-random structure (SQS) methodology to study the ground-state thermodynamic and electronic properties of ScxAl1-xN as a function of Sc composition. © 2022 IEEE.

关键词： Electronic properties

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