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Prediction of Mid-Infrared 2.72 Μm Lasing in Heavily Er3+-Doped Fluorotellurite Glass

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SSRN 2024年

作者： Jing, Yue Yuan, Zirui Kang, Minghui Zhang, Kun Niu, Luyue Wang, Ci Zhou, Renlai Ren, Jing Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Solid State Laser Technology The 11th Research Institute of China Electronics Technology Group Corporation Beijing100015 China

Fluorotellurite glasses heavily doped with Er3+ are prepared in less demanding conditions as compared with fluoride glasses. Specifically, the effects of PbF2 added in the system of AlF3-MgF2-CaF2-SrF2-BaF2-TeO2 are systematically studied on the glass structure and mid-infrared (MIR) luminescent properties of Er3+. These PbF2-modified glasses with an improved thermal stability and a noticeably reduced phonon energy as compared with previously reported telluride glasses exhibit an intense MIR emission at 2.72 μm and a long radiative decay lifetime. Calculation and analysis based on the Judd-Ofelt theory provide deeper insights into the interdependence of luminescent properties and glass structure. Numerical simulation is also conducted for a MIR fiber laser based on the experimental data derived from the proposed glass. The 2.72 μm lasing output of 0.68 W is predicted with a slope efficiency of 3.38 %. It is expected that the performance of the fiber laser can be further optimized such that the output power can be increased over 1.0 W. The results emphasize the potential of the PbF2-modified fluorotellurite glass as a promising gain material for the 2.72 µm fiber laser. © 2024, The Authors. All rights reserved.

关键词： Fiber lasers

Quorum sensing systems regulate heterotrophic nitrification-aerobic denitrification by changing the activity of nitrogen-cycling enzymes

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Environmental Science and Ecotechnology 2020年第2期2卷 40-47页

作者： Ziqian Zhu Yang Yang Anran Fang Yu Lou Guojun Xie Nanqi Ren Defeng Xing State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China

Heterotrophic nitrification-aerobic denitrification(HNAD)is essential in diverse nitrogen-transforming *** HNAD is modulated by quorum sensing(QS)systems is still *** QS system in Pseudomonas aeruginosa manipulates colony ***,we described the influence of the Pseudomonas quinolone signal(PQS)and N-acyl-L-homoserine lactone(AHL)on *** HNAD of *** was inhibited by the oversecretion of ***-or PQS-deficient *** mutants had a higher ability for nitrogen *** inhibited heterotrophic nitrification mainly via controlling the activity of nitrite oxidoreductase(NXR)and the depressed aerobic denitrification by regulating the catalytic abilities of nitric oxide reductase(NOR),nitrite reductase(NIR),and nitrate reductase(NAR).The addition of citrate as the sole carbon source increased the nitrogen removal efficiency compared with other carbon ***,as the sole nitrogen source,could be used entirely with only the moderate concentration of PQS *** and PQS controlled both nitrification and denitrification,suggesting that QS plays an important role in nitrogen cycle under aerobic conditions.

关键词： Heterotrophic nitrification-aerobic denitrification Quorum sensing Pseudomonas aeruginosa Nitrogen cycle Wastewater treatment

Experimental Study on Hydraulic Characteristics and Throttle Component Selection for Fuel Rod Irradiation Test Device

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SSRN 2024年

作者： Zhao, Wenbin Cheng, Jie Yang, Wenhua Jin, Shuai Wang, Jianjun Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China Nuclear Power Institute of China Chengdu610213 China

In order to explore the rationality of the design of the fuel rod irradiation test facility, this paper presents a comprehensive study based on theoretical analysis, hydraulic characteristics test, and numerical simulation. First, the design requirements of the fuel rod irradiation test device were analyzed, and the water pressure characteristics test device was designed based on the resistance similarity principle. Next, the orifice plate and throttling components that match the design flow rate were selected through hydraulic characteristic testing to verify the flow adjustment range of the device. Then, the flow field characteristics of the throttling component are studied through numerical simulation, and the distribution of parameters such as speed, pressure, and temperature are obtained. The results of these methods proved the rationality of the design of the fuel rod irradiation test device as well as the throttling component. © 2024, The Authors. All rights reserved.

关键词： Irradiation

Development, Validation and Application of Sub-Channel Thermal-Hydraulic Analysis Code for Liquid Metal Cooled Reactor

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SSRN 2024年

作者： Wang, Jinshun Chen, Ronghua Liang, Yu Gui, Minyang Zhu, Xinyang Tian, Wenxi Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China

The liquid metal reactor, specifically the lead-based fast reactor and the sodium-cooled fast reactor, are generally recognized as the most significant representatives of the Gen IV reactors due to their sustainability, economy, security and reliability. In order to conduct thermal-hydraulic safety analysis for liquid metal cooled fast reactors, adaptive improvements are made to the model and solution algorithms based on the sub-channel analysis method, and a Sub-channel Analysis Code Of Safety for Liquid Metal cooled Reactor (SACOS-LMR) is developed. The validation of SACOS-LMR is conducted using classic experimental data of liquid metal. The results show that the dimensionless temperature deviations of ORNL 19-pin test and Toshiba 37-pin test are within 10%, and the relative temperature deviations of KIT-KALLA 19-pin test are within 25%. These findings confirm the accuracy and reliability of SACOS-LMR in predicting the temperature distribution of liquid metal reactors. Ultimately, calculations conducted on the ALFRED lead-cooled fast reactor demonstrated the practical utility of the code and have certain guiding significance for its subsequent design and development. © 2024, The Authors. All rights reserved.

关键词： Liquid metals

PR2: A Physics- and Photo-realistic Humanoid Testbed with Pilot Study in Competition

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arXiv

arXiv 2024年

作者： Liu, Hangxin Xie, Qi Zhang, Zeyu Yuan, Tao Leng, Xiaokun Sun, Lining Zhu, Song-Chun Zhang, Jingwen He, Zhicheng Su, Yao Beijing100080 China Institute for Artificial Intelligence School of Artificial Intelligence Peking University Beijing100871 China Department of Automation Tsinghua University Beijing100084 China Department of Computer Science Harbin Institute of Technology Harbin150001 China School of Mechatronics Engineering Harbin Institute of Technology Harbin150080 China Jiangsu Provincial Key Laboratory of Advanced Robotics School of Mechanical and Electric Engineering Soochow University Suzhou215000 China

This paper presents the development of a Physicsrealistic and Photo-realistic humanoid robot testbed, PR2, to facilitate collaborative research between Embodied Artificial Intelligence (Embodied AI) and robotics. PR2 offers high-quality scene rendering and robot dynamic simulation, enabling (i) the creation of diverse scenes using various digital assets, (ii) the integration of advanced perception or foundation models, and (iii) the implementation of planning and control algorithms for dynamic humanoid robot behaviors based on environmental feedback. The beta version of PR2 has been deployed for the simulation track of a nationwide full-size humanoid robot competition for college students, attracting 137 teams and over 400 participants within four months. This competition covered traditional tasks in bipedal walking, as well as novel challenges in loco-manipulation and language-instruction-based object search, marking a first for public college robotics competitions. A retrospective analysis of the competition suggests that future events should emphasize the integration of locomotion with manipulation and perception. By making the PR2 testbed publicly available at https://***/pr2-humanoid/PR2-Platform, we aim to further advance education and training in humanoid robotics. © 2024, CC BY.

关键词： Anthropomorphic robots

Novel Sulfide-Driven Denitrification Methane Oxidation (Sdmo) system Based on Sbr-Mbfr and Egsb-Mbfr

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SSRN 2024年

作者： Wang, Wei Yu, Miao Zhao, Lei Zhang, Jiabin Shao, Bo Xing, De-Feng Ma, Jun Lee, Duu-Jong Ren, Nan-Qi Chen, Chuan State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology HeiLongjiang Province Harbin150090 China Department of Mechanical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

Traditional denitrification process consumes external organic carbon leading to an increase in treatment costs and carbon emission. A novel sulfide-driven denitrification methane oxidation (SDMO) system, which could simultaneously utilize CH4 and H2S in biogas as electron donors for denitrification to reduce the cost and carbon emission, has been successfully operated in two kinds of reactors SBR-MBfR and EGSB-MBfR for ~200 days in this study. The performance and microbial community were explored meanwhile machine learning approach have been used for predicting the complex effects on SDMO’s denitrification efficiency. Result shows SBR-MBfR’s superior performance in terms of overall denitrification rates, efficiencies, and biological activity compared to the EGSB-MBfR. The autotrophic denitrification (Auto-D) contributed more for nitrate removal in SBR-MBfR while denitrification anaerobic methane oxidation (DAMO) was more prominent in EGSB-MBfR. Nineteen machine learning models were used for operation data training and random forest regressor was demonstrated to be the optimal model for predicting nitrate removal efficiency in SDMO. According to random forest regressor’s analysis, HRT presented the highest importance in affecting SDMO nitrate removal efficiency. After the introduction of biogas for domestication, Auto-D bacteria Thiobacillus was the dominant bacteria in both systems and the abundance would increase gradually as H2S content rising. A hidden positive correlation between DAMO bacteria Candidatus Methylomirabilis and Thiobacillus was uncovered by mantel test analysis here, implying the integrating of Auto-D and DAMO process for nitrate removal. This study not only provides insights into the novel SDMO technology but also offers a potential advancement in simultaneously low-carbon footprint wastewater treatment and biogas utilization. © 2024, The Authors. All rights reserved.

关键词： Nitrates

Research on multi-coils wireless power transfer system Based on Insulator with Flanges

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Research on multi-coils wireless power transfer System Based...

Electrical Engineering (CIYCEE), IEEE China International Youth Conference on

作者： Yang Liu Fuyao Yang Yu Han Jie Gao Hao Sun Cong Wang Yueshi Guan State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Bei Jing China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China

This article claims the properties and working characteristics of multi-relay WPT systems, and studies various factors that affect the output efficiency of the system. At the same time, this article also investigates the impact of composite insulator metal flanges on the multi-relay WPT system when it operates in 110kV composite insulators, providing some guidance for the arrangement of all the coils in the composite insulator.

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In Situ H2o2 Production from Self-Sufficient Heterogeneous Fenton Reaction Over Fe0/Mos2-X for Potential Environmental Remediation Applications

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SSRN 2024年

作者： Yang, Yang Yao, Tongjie Balasubramanian, Rajasekhar Chen, J. Paul Department of Civil and Environmental Engineering National University of Singapore Kent Ridge10 Singapore State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin China

The widespread application of the Fenton reaction in environmental remediation has been significantly hampered by the continuous external supply of H2O2, slow Fe3+/Fe2+ cycle rate, high energy requirements, and the necessity of pH pre-adjustment. Herein, a novel self-sufficient heterogeneous Fenton system based on Fe0/MoS2-x was designed, fabricated, and optimized to effectively address these limitations. The combined presence of Fe0 and sulfur vacancies sites in MoS2-x played a pivotal role in the in situ generation of H2O2via two-step single-electron reduction without any energy consumption. The existence of dual active sites resulted in a considerable increase in the H2O2 yield (up to 0.6 mM/g/h) in a neutral aqueous solution. Furthermore, the Fe3+/Fe2+ cycle rate was accelerated by Mo6+/Mo4+/Moδ+ sites. These factors collectively contributed to the impressive performance of this advanced oxidation process in degrading complex pollutants (e.g., polyethylene, a model plastic) under neutral conditions. In addition to its outstanding catalytic performance, Fe0/MoS2-x exhibited superior reusability and stability. Notably, the catalyst reactivity was well sustained in the presence of common aquatic pollutants such as inorganic anions, dissolved organic pollutants, and for other polymer types. This study demonstrates that Fe0/MoS2-x with the impressive self-sufficient Fenton capacity has the potential to be used for practical environmental remediation applications. © 2024, The Authors. All rights reserved.

关键词： Molybdenum compounds

Multifaceted Effects of Ultrasonic Enhanced Fe-C/Pds system for Sludge Dewatering and Resource Utilization: Synergy of Oxidation and Cracking Processes

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SSRN 2024年

作者： Li, Wenye Xie, Binghan Li, Qinghao Li, Zhipeng Zhu, Jing You, Hong Zhang, Guoyu Li, Weirun Xing, Xiaodi Zeng, Fanbo Li, Lingjie Zhao, Shuyu Shang, Zhiwei Wang, Shuxiao Harbin Institute of Technology Weihai Sch Marine Sci & Technol Weihai264209 China Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm Harbin150090 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. In this study, ultrasonic (US) collaborative Fe-C activated peroxydisulfate (PDS) coupling system was constructed to investigate the shift in physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The US enhanced Fe-C/PDS system exhibited excellent oxidation capacity with the water content (Wc) of sludge cake and the specific resistance to filtration (SRF) reducing to 61.71% and 1.12×1012 m/kg under the conditions of PDS, Fe-C, and US power levels at 120 mg/g TS, 300mg/g TS, and 150W. Furthermore, the high cracking capacity led to a rise in soluble chemical oxygen demand to 630.64 mg/L and a 9.16% reduction in volatile solids. Compared to Fe-C/PDS, the addition of US enhanced the leaching of Fe, promoted to the formation of reactive oxidative species. The contribution of ·O2-and 1O2 to sludge conditioning was 37% and 43.17%, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, US improved the cracking capacity of the system, releasing bound extracellular polymeric substances (EPS) and degrading into soluble properties. The concentration of short-chain fatty acids (SCFAs) in the sludge was increased by 96.7%, which significantly improved the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the decryption-degradation synergistic effect of the coupled systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization. © 2024, The Authors. All rights reserved.

关键词： Dewatering