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SSRN 2023年

作者： Njoya, Ousmanou Wang, Zhehao Shen, Jimin Zhao, Shengxin Tan, Qiang Qu, Yanfeng Chen, Zhonglin State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China Institute of Agricultural Research for Development P.O. Box 415 Garoua Cameroon School of Food Engineering Harbin University Harbin150086 China

The use of chemical reduction to convert highly toxic Cr(VI) in water into low toxic and weakly mobile Cr(III) is considered the most feasible. Carboxylic acids (CAs) as clean regent widely coexists in multiples types of wastewater with Cr(VI). The influence of coexisting CAs during Cr(VI) reduction process should be widely studied. In this investigation, the role of coexisting CAs including Citrate and EDTA in Cr(VI) reduction was clarified. The results indicated that Citrate and EDTA could significantly promote Cr(VI) reduction by NaBH4. EDTA had a better promoting effect, exhibiting that 10 mM EDTA obtained similar 90.31% and 87.67% of Cr(VI) reduction at initial pH 4 and 5, respectively, reducing the requirement for low initial pH for Cr(VI) reduction. Regarding the improvement mechanism of Cr(VI) by NaBH4, Citrate and EDTA did not directly transfer their electrons to Cr(VI), while the addition of BH4- resulted in their degradation or transformation. Citrate and EDTA had two effects on Cr(VI) reduction by NaBH4. On the one hand, they provided a strong buffering effect, providing H+ to the reaction system for resisting OH- from NaBH4 self-hydrolysis and alleviate H+ requirement for Cr(VI) reduction;On the other hand, it might be attributed to the fact that Citrate or EDTA could eliminate some of hydrogen radical (•H) producing from homolysis of B–H bonds induced by Cr(VI), which exhibited a slight inhibitory of Cr(VI) reduction due to the competition with Cr(VI) for •H. However, the promoting effect was greater than the inhibitory effect. The findings provided new insights into Cr(VI) reduction by NaBH4 mediated by CAs, which is of interest for systems engineered for Cr(VI) remediation. © 2023, The Authors. All rights reserved.

关键词： Hydrogen bonds

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High-Speed 2 $\mu \mathrm{m}$ Silicon Photonic Mach-Zehnder Modulator with 30 GHz Bandwidth

High-Speed 2 $\mu \mathrm{m}$ Silicon Photonic Mach-Zehnder ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Jianing Wang Xuelin Zhang Xi Wang Yanfu Yang Jiangbing Du Ke Xu Department of Integrated Circuits Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Department of Integrated Circuits Harbin Institute of Technology Shenzhen China

We proposed a high-speed $2-\mu \mathrm{m}$ Mach-Zehnder modulator with a record high bandwidth up to 30 GHz, which is able to modulate high-speed signals up to 34 Gb/s.

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

We proposed a high-speed $2-\mu \mathrm{m}$ Mach-Zehnder modulator with a record high bandwidth up to 30 GHz, which is able to modulate high-speed signals up to 34 Gb/s.

关键词： Mach-Zehnder interferometers Asia Modulation Bandwidth Silicon photonics Optical fiber communication system-on-chip Next generation networking Signal to noise ratio

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Field-Assisted Direct Patterning in Micro-Nano Structure of Liquid Metal with Self-Made Conducting Atomic Force Microscope 2

Field-Assisted Direct Patterning in Micro-Nano Structure of ...

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2nd IEEE Eurasia Conference on IOT, Communication and Engineering, ECICE 2020

作者： Zou, Tao Rong, Weibin Ma, He Zhang, Ye Pei, Zhichao Li, Jian Harbin Institute of Technology State Key Laboratory of Robotics and Systems Harbin China Huaqiao University Xiamen China

ISBN: (纸本)9781728180601

Gallium-indium alloy is a kind of liquid metal and an important material in flexible circuits, wearable devices, micro-sensors and so on. Owing to its strong surface oxide film, it is difficult to process. Thus, fabricating the micro-nano structures with high repeatability and high precision has become a research focus in recent years. We propose a method of processing liquid metal with the aid of an electric field using a conducting atomic force microscope (CAFM) probe for the first time. The commercial self-sensing AFM probes were transformed into CAFM probes through micro-manipulation, and a set of low-cost and high-precision CAFM was designed and built. The liquid metal atoms were first coated on a CAFM tip and then, ionized and polarized when a threshold tip bias was achieved, thereby depositing onto the substrate. The patterning of liquid metal micro-nano structures was made by controlling the tip bias, the power-on time, and the moving speed of the probe. The manufacturing resolution of the structures reached 2μm, and the thickness was approximately 10-20 nm. The new fabrication strategy and the basic principle have a generalized purpose and are applied to nano-electronic devices, chip circuits, nano welding, and other fields. © 2020 IEEE.

关键词： Liquid metals

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Surface-Bulk-Passivated Perovskite Films Via 2-Thiophenemethylammonium Bromide and Pbbr2 For Air-Processed Perovskite Solar Cells with High-Stability

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SSRN 2023年

作者： Wen, Lingling Deng, Yaxin Zeng, Gangyi Liu, Guangyao Li, Xin MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering State Key Lab of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China

Suppressing non-radiative recombination induced by defect is of much concern to efficient and stable perovskite solar cells (PSCs). We report a cooperative strategy to passivate both interfacial and bulk defects in perovskite layer by coupling interface engineering and additive engineering. 2-Thiophenemethylammonium bromide (2-ThMAB) is synthesized by recrystallization. PbBr2 used as an additive is introduced into the perovskite precursor solution. 2-ThMAB features with an electron-rich π-system and 2-thiophene group. Br− ions have an impact on perovskite lattice reorganization. The synergistic modification of 2-ThMAB and PbBr2 enables the external electronic state modulation and internal bandgap adjustment of perovskite, which is beneficial to passivate defect and inhibit ion migration. As a result, a modified PSC exhibits a high-power conversion efficiency of 20.01% with negligible hysteresis for an all-air-processed device. More importantly, a non-encapsulated device exhibits excellent long-term stability of T98 of > 720 hours. This study thus provides a new way to obtain highly stable all-air-processed PSCs. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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RGB-D Co-attention Network for Semantic Segmentation 15th

RGB-D Co-attention Network for Semantic Segmentation

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15th Asian Conference on Computer Vision, ACCV 2020

作者： Zhou, Hao Qi, Lu Wan, Zhaoliang Huang, Hai Yang, Xu National Key Laboratory of Science and Technology of Underwater Vehicle Harbin Engineering University Harbin China The Chinese University of Hong Kong Hong Kong China State Key Laboratory of Management and Control for Complex System Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)9783030695248

Incorporating the depth (D) information for RGB images has proven the effectiveness and robustness in semantic segmentation. However, the fusion between them is still a challenge due to their meaning discrepancy, in which RGB represents the color but D depth information. In this paper, we propose a co-attention Network (CANet) to capture the fine-grained interplay between RGB’ and D’ features. The key part in our CANet is co-attention fusion part. It includes three modules. At first, the position and channel co-attention fusion modules adaptively fuse color and depth features in spatial and channel dimension. Finally, a final fusion module integrates the outputs of the two co-attention fusion modules for forming a more representative feature. Our extensive experiments validate the effectiveness of CANet in fusing RGB and D features, achieving the state-of-the-art performance on two challenging RGB-D semantic segmentation datasets, i.e., NYUDv2, SUN-RGBD. © 2021, Springer Nature Switzerland AG.

关键词： Semantic Segmentation

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Design of a Mesh Crawling Robot with Beetle-Inspired Variable Stiffness Tarsus

Design of a Mesh Crawling Robot with Beetle-Inspired Variabl...

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IEEE International Conference on robotics and Biomimetics

作者： Hao Chen Kai Hu Longlong Hu Ziqi Zhou Yao Li Bing Li Guangdong Provincial Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics Key University Laboratory of Mechanism & Machine Theory and Intelligent Unmanned Systems of Guangdong Shenzhen China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen China

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

Compared with large robots, micro-robots have the advantages of small size, low power consumption, and high concealment. For complex terrain, the crawling performance of micro-robots will be significantly reduced. In this study, the mesh surface was used as the crawling base of the robot, and a variable stiffness tarsus was designed with the beetle as a reference. This tarsus composed of multiple bending parts achieves a large range of stiffness changes, 0.07~0.495 N/mm. We have achieved stiffness control of the tarsus in a single actuation by trajectory planning of the claw ends. The proposed robot can achieve a big stiffness of the tarsus to resist the deformation of the tarsus due to external forces, which means that the robot can increase the adhesion ability when crawling at the stance phase. Therefore, even when the load was increased from 10g to 40g, the average crawling speed of the robot was not significantly reduced. This new tarsus can improve the crawling performance of the micro-robot on the mesh.

关键词： Legged locomotion Power demand Trajectory planning Force Kinematics Resists Bending Robots Substrates Trajectory optimization

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A Novel Sample Manipulation Device (SMD) for Lunar Regolith Volatile In-Situ Exploration: Method and Validation

A Novel Sample Manipulation Device (SMD) for Lunar Regolith ...

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IEEE International Conference on robotics and Biomimetics

作者： Junyue Tang Tian Yang Xiren Chen Ziheng Liu Jiannan Li Zhiheng Zhang Junxiao Xiao Cheng Chi Shengyuan Jiang State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin P. R. China Nanjing University of Aeronautics and Astronautics Chinese Academy of Sciences Institute of Geology and Geophysics Beijing P. R. China

ISBN: (纸本)9781665481106

Extraction and analysis of volatile substances in lunar regoilth is an important means to reveal the formation of the Earth-moon system and explore lunar resources. At present, volatile matter loss will be caused by shock vibration and pressure change of returned samples, so volatile matter needs to be prepared in situ on the lunar surface. In order to accurately measure the contents of volatile matter in lunar regoilth, it is necessary to collect samples with constant volume and quantity. In view of the above problems, this paper designed a sample manipulation device for quantitative detection, sample transfer and volatile preparation of lunar regoilth. The device carries 12 sample tubes through the gear disc to realize double station sample transfer. Seal requirements during sample reception and heating are achieved by lifting the rack. The test shows that the device can accurately measure the sample volume, the sample transfer time is 76.67s, and the thrust into the furnace is more than 150N, which meets the requirements of sample processing time and sealing. The device has a certain enlightening effect on the subsequent lunar exploration project.

关键词： Heating systems Vibrations Gears Volume measurement Furnaces Moon Switches

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A Novel Pattern of Coupling Sulfur-Based Autotrophic Disproportionation and Denitrification Processes for Achieving High-Rate and Precisely Adjustable Nitrogen Removal

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SSRN 2023年

作者： Sun, Yi-Lu Zheng, Kun Zhai, Si-Yuan Cheng, Hao-Yi Qian, Zhi-Min Wang, Hong-Cheng Yang, Ji-Xian Zhang, Xue-Ning Wang, Ai-Jie Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China State Key Laboratory of Urban Water Resources and Environment School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China

Sulfur-based autotrophic disproportionation (SADP), a process of fermenting inorganic sulfur into sulfide and sulfate, is increasingly concerned during applying sulfur-based autotrophic denitrification (SADN) for treating low C/N ratio wastewater. Given that the electron outputs from sulfur could be impressively improved by SADP products (SADP-S2-) and polysulfuration once SADP in-situ occurring in SADN system. However, in-situ SADP process was uncontrollable resulting in losing the capacity of precisely adjusting the SADN rate and exposing a risk of excessive sulfide emission. In this study, the SADP process was independently achieved in a sulfur packed bed reactor with a controllable sulfide production rate between 0.24±0.02−0.83±0.03 kg-S/m3/d by adjusting 1−5 h of empty bed contact time (EBCT). Afterwards, a SAD2 system, that connecting the SADP process prior to SADN process, was established which realized 2.38 times enhancement of SADN rate that being adjustable between 0.65±0.06−1.55±0.20 kg-NO3-N/m3/d. Meanwhile, the SADP-S2- performed a higher biocompatibility than chemical-S2- (Na2S) at a similar dosage, because the bioavailability of sulfur was promoted as well by 1.66 times as a result of stoichiometry matrix calculation. Polysulfuration was indeed happened in the biofilm according to an increase of linear Sn proportion from 8.1% to 30.1% but with few releases of polysulfide (352 μg-S/L) into the water. The biomass enhancement was determined by the increase of protein (30.0%), ATP (6.9%), live cells proportion (10.1%) and total relative abundance of denitrificans (87.7%). These findings suggested that the novel pattern of SAD2 system could achieve an adjustable high-rate nitrogen removal without sulfide emission risk, which empowers more reliable and safer maintenance to the SADN application. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

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High-order Fully Actuated Approach for Output Position Control of Two Mass systems based on Extended state Observer

High-order Fully Actuated Approach for Output Position Contr...

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Fully Actuated system Theory and Applications (CFASTA), Conference on

作者： Ping Li Guang-Ren Duan Bi Zhang Yuzhong Wang Shenzhen Key Laboratory of Control Theory and Intelligent Systems School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798350373691

ISBN: (纸本)9798350373707

This paper proposes a high-order fully actuated (HOFA) control approach for the output position control of two-mass systems (TMSs) based on extended state observer (ESO). TMSs belongs to a class of underactuated mechanical systems, which can be converted into an HOFA model using variable elimination. Based on the feature of HOFA model, it is extremely simple to solve the position control law such that a desired tracking error system can be achieved. To handle the control issues of high-order derivatives and unknown disturbances, a linear ESO is employed for state estimation and active disturbance rejection control, where the lumped disturbance is treated as an extended system state. The theoretical stability of control system is analyzed with the help of sliding manifold. Comparative simulations are performed to demonstrate the effectiveness of the proposed approach.

关键词： Robust control Uncertain systems Simulation Position control Observers Control systems Stability analysis

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Lanthanide-doped nanocrystals in high-Q microtoroids for stable on-chip white-light lasers

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Photonics Research 2022年第7期10卷 1594-1601页

作者： LIMIN JIN ZHUO LIU YUQI ZHANG YUNKAI WU YILIN LIU HUACHUN DENG QINGHAI SONG SHUMIN XIAO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Pengcheng Laboratory Shenzhen 518055China

The plentiful energy states of lanthanide(Ln^(3+))-doped nanomaterials make them very promising for on-chip integrated white-light *** the rapid progresses,the Ln^(3+)-based white upconversion emissions are strongly restricted by their low upconversion quantum efficiency and the color ***,we combine the CaF_(2):Yb_(35)Tm_(1.5)Er_(0.5)nanocrystals and the high-Q microtoroids,and experimentally demonstrate the chip-integrated stable white-light *** optimizing the sizes,density,and distributions of Ln^(3+)-doped nanocrystals,the Q factors of Ln^(3+)-doped microtoroids are maintained as high as 5×10^(5).The strong light matter interaction in high-Q microtoroids greatly enhances the upconversion emission and dramatically reduces the laser thresholds at 652 nm,545 nm,and 475 nm to similarly low values(1.89-2.10 m J cm^(-2)).Consequently,robust white-light microlaser has been experimentally achieved from a single *** research has paved a solid step toward the chip-scale integrated broadband microlasers.

关键词： stability light Lanthanide

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