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Research on the magnetorheological polishing random rotation technology applied to restrain the mid-spatial frequency waviness errors of high-power laser elements 3

Research on the magnetorheological polishing random rotation...

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3rd International Computing Imaging Conference, CITA 2023

作者： Si, Hailun Song, Ci Wang, Bo Shi, Feng Tie, Guipeng Tian, Ye Qiao, Shuo College of Intelligence Science and Technology National University of Defense Technology 109 Deya Road Changsha410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology 109 Deya Road Changsha410073 China

ISBN: (纸本)9781510671409

The high-power laser system imposes stringent demands on the complete spatial frequency range, particularly the mid-spatial frequency errors of its optical elements. The presence of mid-spatial frequency errors significantly compromises the optical performance of the system. To mitigate the mid-spatial frequency waviness error in high-power laser elements following magnetorheological polishing, this study utilized a proprietary rotatable magnetorheological polishing apparatus. The aim was to simulate the impact magnetorheological polishing on the surface's mid-spatial frequency waviness errors in the absence of rotation, as well as to evaluate the effectiveness of random rotation angles in suppressing the surface's mid-spatial frequency waviness errors. Ultimately, the fused quartz element was simulated and modified. The simulation results demonstrate that utilizing the rotatable magnetorheological polishing equipment with a rotating magnetorheological polishing head effectively suppresses the low-spatial frequency surface accuracy, resulting in reduced mid-spatial frequency waviness on the processed element's surface. The RMS of surface errors decreases from 11.142nm to 0.765nm, eliminating noticeable mid-spatial frequency waviness errors and completely eradicating the characteristic peak in the Power Spectral Density (PSD) curve. Consequently, the surface accuracy of the element is significantly enhanced. Therefore, by adjusting the rotational angle of the magnetorheological polishing head, it is possible to effectively suppress mid-spatial frequency waviness errors on the element's surface and achieve deterministic shaping, thereby meeting the manufacturing requirements for high-power laser elements. © 2023 SPIE.

关键词： High power lasers

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Simulation study on the flow field characteristics of abrasive water jet polishing at different angles based on fused quartz laser element 3

Simulation study on the flow field characteristics of abrasi...

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3rd International Computing Imaging Conference, CITA 2023

作者： Zhang, Zhiqiang Song, Ci Shi, Feng Tie, Guipeng Zhang, Wanli Wang, Bo Tian, Ye College of Intelligence Science and Technology National University of Defense Technology 109 Deya Road Changsha410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology 109 Deya Road Changsha410073 China

ISBN: (纸本)9781510671409

The main factor affecting the laser damage resistance of optical components is the damage precursor introduced in the manufacturing process. Some studies have shown that the ideal intrinsic matrix of fused quartz has a laser radiation damage threshold of up to 100J/cm2, but the manufactured optical components are far below this index. Therefore, effectively inhibiting or even eliminating the damage precursor is the key to improve the anti-laser damage performance of optical components. Abrasive water jet polishing (AWJP) technology mainly removes materials through the collision and shear between abrasive particles and the workpiece surface, which has the characteristics of non-damage and non-contact processing. However, due to the small size of tool influence function (TIF) and low efficiency, it is still challenging to achieve widespread application. In this paper, we analyzed the flow field characteristics near the workpiece surface when different nozzle tilt angles were used for processing under two different machining methods: maintaining the jet length unchanged and maintaining the standoff distance unchanged, and corrected the pressure distribution. It was found that the changes in pressure distribution and shear stress distribution in the impact zone under different nozzle tilt angle conditions will result in a change in the width of the Gaussian-shaped TIF obtained after nozzle rotation machining. In addition, under the condition of the same nozzle tilt angle, the TIF of Gaussian shape with larger size can be obtained by using the processing method that keeps the standoff distance constant. © 2023 SPIE.

关键词： Quartz

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Improved material descriptors for bulk modulus in intermetallic compounds via machine learning

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Rare Metals 2023年第7期42卷 2396-2405页

作者： De-Xin Zhu Kun-Ming Pan Yuan Wu Xiao-Ye Zhou Xiang-Yue Li Yong-Peng Ren Sai-Ru Shi Hua Yu Shi-Zhong Wei Hong-Hui Wu Xu-Sheng Yang National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of High-Temperature Structural and Functional MaterialsHenan University of Science and TechnologyLuoyang471003China Longmen Laboratory Luoyang471003China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Guangdong Province Key Laboratory of Durability for Marine Civil Engineering School of Civil EngineeringShenzhen UniversityShenzhen518060China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong999077China

Bulk modulus is an important mechanical property in the optimal design and selection of intermetallic *** this study,bulk modulus datasets of intermetallic compounds were collected,and the features affecting the bulk modulus of intermetallics were screened via feature *** features B_(cal),dB_(avg),and TIE(corresponding to calculated bulk modulus,mean bulk modulus,and third ionization energy,respectively)were found to be the dominant factors influencing bulk modulus and can be extended to other multi-component ***,we predicted the bulk modulus with an accuracy of 95%using surrogate machine learning models with the selected features,and these features were also demonstrated to be effective for high-entropy ***,symbolic regression provided an expression for the relationship between bulk modulus and the screened *** machine learning models provide a new approach for optimizing and predicting the bulk moduli of intermetallic compounds.

关键词： Bulk modulus Intermetallic compounds Machine learning Symbolic regression

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Research on Constant Power control Strategy of Marine Propulsion Converter under High Sea Conditions 8

Research on Constant Power Control Strategy of Marine Propul...

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8th Asia Conference on Power and Electrical Engineering, ACPEE 2023

作者： Cai, Zongju Ren, Qiang Zhang, Zhijie Sun, Xiran Liu, Kefan Systems Engineering Research Institute CSSC Beijing China Naval University of Engineering Key Laboratory of Marine Integrated Power Technology and National Defense Science and Technology Wuhan China

ISBN: (纸本)9798350345520

Under the conditions of strong wind, waves and high sea conditions, due to the intense movement of the ocean current, the propeller is frequently subjected to short-term high torque impact load, which causes a large fluctuation in the power generation of the electric propulsion marine power generation system, which is not conducive to the stability and economy of the diesel generator set. After the theoretical analysis of permanent magnet synchronous motor control, this paper proposes a kind of power and current double closed-loop constant power control strategy based on power feedforward, and gives a design example and test verification. The test results show that the constant power control strategy shows good dynamic performance, which can effectively reduce power ripple at the input end of the propulsion converter under high sea conditions, and make the diesel sets run efficiently. © 2023 IEEE.

关键词： Electric loads

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Frequency Information Matters for Image Matting 1

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7th Asian Conference on Pattern Recognition, ACPR 2023

作者： Luo, Rongsheng Wei, Rukai Gao, Changxin Sang, Nong Key Laboratory of Image Processing and Intelligent Control School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan China Wuhan National Laboratory For Optoelectronics Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9783031476341

ISBN: (纸本)9783031476334

Image matting aims to estimate the opacity of foreground objects in order to accurately extract them from the background. Existing methods are only concerned with RGB features to obtain alpha mattes, limiting the perception of local tiny details. To address this issue, we introduce frequency information as an auxiliary clue to accurately distinguish foreground boundaries and propose the Frequency Matting Network (FMN). Specifically, we deploy a Frequency Boosting Module (FBM) in addition to the Discrete Cosine Transform (DCT) to extract frequency information from input images. The proposed FBM is a learnable component that empowers the model to adapt to complex scenarios. Furthermore, we design a Domain Aggregation Module (DAM) to effectively fuse frequency features with RGB features. With the assistance of frequency clues, our proposed FMN achieves significant improvements in matting accuracy and visual quality compared with state-of-the-art methods. Extensive experiments on Composition-1k and Distinctions-646 datasets demonstrate the superiority of introducing frequency information for image matting. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Discrete cosine transforms

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Minimally invasive bioprinting for in situ liver regeneration

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Bioactive Materials 2023年第8期26卷 465-477页

作者： Yueying Yang Zhengyang Yu Xiaohuan Lu Jiahao Dai Cheng Zhou Jing Yan Lin Wang Zheng Wang Jianfeng Zang School of Integrated Circuits and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074PR China Research Center for Tissue Engineering and Regenerative Medicine Department of Gastrointestinal SurgeryWuhan Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022PR China Research Center for Tissue Engineering and Regenerative Medicine Department of Clinical LaboratoryWuhan Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022PR China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan430074PR China

In situ bioprinting is promising for developing scaffolds directly on defect models in operating rooms,which provides a new strategy for in situ tissue ***,due to the limitation of existing in situ biofabrication technologies including printing depth and suitable bioinks,bioprinting scaffolds in deep dermal or extremity injuries remains a grand ***,we present an in vivo scaffold fabrication approach by minimally invasive bioprinting electroactive hydrogel scaffolds to promote in situ tissue *** minimally invasive bioprinting system consists of a ferromagnetic soft catheter robot for extrusion,a digital laparoscope for in situ monitoring,and a Veress needle for establishing a *** 3D reconstruction of the defects with computed tomography,electroactive hydrogel scaffolds are printed within partial liver resection of live rats,and in situ tissue regeneration is achieved by promoting the proliferation,migration,and differentiation of cells and maintaining liver function in vivo.

关键词： In vivo tissue regeneration In situ bioprinting Minimally invasive surgery Conductive hydrogel

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A critical review of on-site inorganic arsenic screening methods

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Journal of Environmental sciences 2023年第3期125卷 453-469页

作者： Yi He Jingyu Liu Yanhua Duan Xiaofei Yuan Lulu Ma Ratan Dhar Yan Zheng Department of Sciences John Jay College and the Graduate CenterThe City University of New YorkNY 10019USA State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Queensland Alliance for Environmental Health Sciences(QAEHS) The University of QueenslandQLD 4102Australia Department of Earth and Physical Sciences York CollegeThe City University of New YorkNY 11451USA

Approximately 94 to 220 million people worldwide are at risk of drinking well water containing arsenic > 10 μg/L, the WHO guideline value. To identify non-compliant domestic wells, assess health risks and reduce exposure, accurate and rapid on-site inorganic arsenic screening methods are desirable because all domestic wells worldwide need to be ***, the principles, advantages and limitations of commonly used colorimetry, electrochemistry, and biosensing methods are critically reviewed, with the performance compared with laboratory-based benchmark methods. Most commercial kits are based on the classic Gutzeit reaction. Despite being semi-quantitative, the more recent and more expensive products display improved and acceptable accuracy and shorter testing time (~10 min). Carried out by trained professionals, electrochemical methods are also feasible for on-site analysis, although miniaturization is desirable yet challenging. Biosensing using whole bacterial cells or bio-engineered materials such as aptamers is promising, if incorporated with function specific nanomaterials and biomaterials. Since arsenic is frequently found as arsenite in reducing groundwater and subject to oxidation during sampling, transportation and storage, on-site separation and sample preservation are feasible but the specific methods should be chosen based on sample matrix and tested before use. To eliminate arsenic exposure among hundreds of millions of mostly rural residents worldwide, we call for concerted efforts in research community and regulatory authority to develop accurate, rapid, and affordable tests for on-site screening and monitoring of arsenic in drinking water. Access to affordable testing will benefit people who are socioeconomically disadvantaged.

关键词： Inorganic arsenic On-site analysis Drinking water Groundwater Field test

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Bispecific aptamer-initiated 3D DNA nanomotor biosensor powered by DNAzyme and entropy-driven circuit for sensitive and specificity detection of lysozyme

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Nano Research 2023年第1期16卷 1286-1295页

作者： Shuo Qi Yuhan Sun Xiaoze Dong Imran Mahmood Khan Yan Lv Yin Zhang Nuo Duan Shijia Wu Zhouping Wang State Key Laboratory of Food Science and Technology International Joint Laboratory on Food SafetyJiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China Key Laboratory of Meat Processing of Sichuan Chengdu UniversityChengdu 610106China National Engineering Research Center for Functional Food Jiangnan UniversityWuxi 214122China Collaborative Inno vation Center of Food Safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi 214122China

Dynamic DNA nanodevices have gained tremendous attention due to their extraordinary inherent functionality and advantages,however,dynamic DNA nanodevices-based biosensors are still challenging due to their high reliance on proteases and limited amplification ***,exploiting bispecific aptamer as initiators for the first time,we developed a three-dimensional(3D)DNA nanomotor biosensor powered by DNAzyme and entropy-driven circuit for sensitive and specific detection of lysozyme,in which walking and rolling strategies are efficiently integrated to achieve excellent signal amplification *** from the high selectivity of bispecific aptamer,the 3D DNA nanomotor biosensor can respond to lysozyme with high specificity and operate at high speed to release *** whole process is independent of protease,avoiding the influence of adverse environment on the operation *** optimal conditions,it can achieve a limit of detection as low as 0.01 pg/mL with an excellent linear range of 0.05 pg/mL–500 ng/mL for ***,the proposed strategy revealed high accuracy in the analysis of real samples,indicating a great potential for the application of nanomotor biosensors to the detection of non-nucleic acid targets.

关键词： bispecific aptamer DNA rolling DNA walking amplification specificity

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Dynamics and diversity of microbial community in salmon slices during refrigerated storage and identification of biogenic amine-producing bacteria

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Food Bioscience 2023年第2期52卷 740-748页

作者： Yingchang Li Nan Zhao Yuanyuan Li Defu Zhang Tong Sun Jianrong Li College of Food Science and Technology Food Safety Key Laboratory of Liaoning ProvinceNational&Local Joint Engineering Research Center for StorageProcessing and Safety Control Technology for Fresh Agricultural and Aquatic ProductsBohai UniversityJinzhou121013LiaoningChina

The changes in microbial composition of salmon slices during storage at 4◦C were measured using high-throughput sequencing(HTS),and biogenic amine(BA)-producing bacteria were isolated from salmon slices to evaluate their ability to produce *** salmon slices had the highest bacterial diversity,which decreased with the extension of the refrigerated storage *** was the dominating genus in fresh salmon slices,followed by Photobacterium and Burkholderia,while Brochothrix became the dominant bacterium in the later stages of the storage *** strains of BA-producing bacteria were isolated and determined,which varied greatly in BA *** these,Brochothrix thermosphacta(B5)exhibited the strongest BA-producing ability,producing 98.32 mg/mL of putrescine and 78.81 mg/mL of cadaverine,and Photobacterium phosphoreum showed a stronger histamine-producing ability(77.07 mg/mL).This study explored the microbial composition in salmon slices and offer insight into the relationship between microorganisms and BAs in salmon *** study provides a theoretical basis for developing antibacterial agents,decreasing the amount BAs,and extending the shelf-life of salmon slices.

关键词： High-throughput sequencing Microbial community Biogenic amine-producing bacteria Biogenic amines Salmon slices

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A hybrid single quantum dot coupled cavity on a CMOS-compatible SiC photonic chip for Purcellenhanced deterministic single-photon emission

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Light(science & Applications) 2025年第4期14卷 948-958页

作者： Yifan Zhu Runze Liu Ailun Yi Xudong Wang Yuanhao Qin Zihao Zhao Junyi Zhao Bowen Chen Xiuqi Zhang Sannian Song Yongheng Huo Xin Ou Jiaxiang Zhang State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences865 Changning RoadShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Physics The Chinese University of Hong KongHong Kong 999077China Hefei National Research Center for Physical Sciences the Microscale and School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China

The ability to control nonclassical light emission from a single quantum emitter by an integrated cavity may unleash new perspectives for integrated photonic quantum ***,coupling a single quantum emitter to cavity within photonic circuitry towards creation of the Purcell-enhanced single-photon emission is elusive due to the complexity of integrating active devices in low-loss photonic *** we demonstrate a hybrid micro-ring resonator(HMRR)coupled with self-assembled quantum dots(QDs)for cavity-enhanced deterministic single-photon *** HMRR cavity supports whispering-gallery modes with quality factors up to 7.8×*** further introducing a micro-heater,we show that the photon emission of QDs can be locally and dynamically tuned over one free spectral ranges of the HMRR(~4 nm).This allows precise tuning of individual QDs in resonance with the cavity modes,thereby enhancing single-photon emission with a Purcell factor of about *** results on the hybrid integrated cavities coupled with two-level quantum emitters emerge as promising devices for chip-based scalable photonic quantum applications.

关键词： integrated cavity Purcell enhancement quantum dot quantum emitter photonic circuitry integrated photonic active devices quantum dots qds

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