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Microwave－Optical Frequency Standards at NIM：Realizing of Definition of Metre and Second

Li Tianchun

Strategic Study of CAE 2007, Volume 9, Issue 6,   Pages 27-31

Abstract: unit second using the NIM4 cesium fountain clock,  SI length unit meter using a femto-second (FS) optical frequency comb and calibration of wavelengths of stabilized lasers by this FS comb. The frequency uncertainty of the FS optical comb locked to a H-maser, which is steered by NIM4

Keywords： metrology     frequency standard     stabilized laser     Cs fountain clock     FS optical comb    

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A Smart Procedure for the Femtosecond Laser-Based Fabrication of a Polymeric Lab-on-a-Chip for Capturing Article

Annalisa Volpe, Udith Krishnan, Maria Serena Chiriacò, Elisabetta Primiceri, Antonio Ancona, Francesco Ferrara

Engineering 2021, Volume 7, Issue 10,   Pages 1436-1442 doi: 10.1016/j.eng.2020.10.012

Abstract: The entire platform was realized in polymethyl methacrylate (PMMA), combining femtosecond (fs) laser

Keywords： Lab-on-a-chip     Fs laser     Circulating tumor cells     Point of care     Thermal bonding     Polymers    

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Distribution of PCDD/Fs in a food waste anaerobic digestion process with biogas utilization

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 11, doi: 10.1007/s11783-023-1736-7

Abstract:

● The PCDD/F distribution patterns of the FW-AD process were investigated.

Keywords： Biological treatment     MSW classification     Mass balance     Solid digestate    

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PCDD/Fs emission, risk characterization, and reduction in China’s secondary copper production industry

Haiqian LI, Yonglong LU, Li LI

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 4,   Pages 589-597 doi: 10.1007/s11783-013-0495-2

Abstract: Secondary copper production is one of the key polychlorinated dibenzo- -dioxins and dibenzofurans (PCDD/FsIn 2004, when the Stockholm Convention entered into force in China, PCDD/Fs emissions from secondaryIn this paper, PCDD/Fs emission dynamics from secondary copper industry were discussed and cumulativeFrom 2004 to 2009, industrial policies played an indirect role in PCDD/Fs reduction, but its effectscomparatively higher accumulated risk and were recommended as the priority regions for promoting PCDD/Fs

Keywords： polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs)     secondary copper production    

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Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample (ASKAREL Nr 1740) from an

Jun HUANG, Yamei HUI, Toru MATSUMURA, Gang YU, Shubo DENG, Makoto YAMAUCHI, Changmin WU, Norimasa YAMAZAKI

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 2,   Pages 195-204 doi: 10.1007/s11783-013-0527-y

Abstract: Homolog and congener profiles of polychlorinated biphenyls (PCBs), polychlorinated dibenzo- - dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in commercial PCBs formulations are useful information for the source appointment of PCBs contamination as well as the risk assessment caused by potential exposure. Dielectric oil (ASKAREL Nr 1740) in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatography-high resolution mass spectrometry (HRGC/HRMS). The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations. High similarity in the homolog profile between the oil sample and Aroclor 1260 was found, with the hexachlorinated and heptachlorinated biphenyls accounting for more than 80.2% of the total PCBs concentration. Severn indicator PCBs contribute about 30%, while 12 PCB congeners (i.e., #153, #143, #168, #180, #149, #165, #138, #170, #190, #187, #174, #181) account for more than 50% of the total PCB concentrations. Total concentration of PCDDs, PCDFs and dioxin-like PCBs (DL-PCBs) was found to be 740 ng TEQ/g, of which 620 ng TEQ/g came from DL-PCBs. The contribution of PCDDs to the total TEQ was neglectable. The concentration of PCDFs homologs follows the order of OCDF>HxCDFs>HpCDFs>PeCDFs>TeCDFs, which is in consistence with the previous study on Aroclor 1260. Three DL-PCBs congeners (i.e., #118, #156, #157) accounted for 77% of the total concentration of DL-PCBs, also they contribute 72% in the TEQ caused by DL-PCBs.

Keywords： profiles of polychlorinated biphenyls (PCBs)     polychlorinated dibenzo-p-dioxins (PCDDs)     polychlorinated dibenzofurans (PCDFs)     Askarel transformer     insulating fluid    

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study on low temperature thermal treatment of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs

YAN Jianhua, CHEN Tong, LU Shengyong, LI Xiaodong, GU Yueling, CEN Kefa

Frontiers in Energy 2007, Volume 1, Issue 3,   Pages 280-284 doi: 10.1007/s11708-007-0039-1

Abstract: The effects of temperature and time on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs)The PCDD/Fs in the gas phase and solid phase were detected by high-resolution gas chromatography coupledThere were high levels of OCDD in the gas phase in several experimental conditions although the PCDD/FsThe optimum condition for PCDD/Fs decomposition in fly ash was a heating time of 60 min at 400 vH under

Keywords： congener     polychlorinated     temperature     chromatography     high-resolution    

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Development of Laser Cutting and Joining Processing

Chen Li, Gong Shuili, He Enguang

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 78-84 doi: 10.15302/J-SSCAE-2020.03.012

Abstract:

Laser cutting and joining technology is indispensable as an advancedbe surely promoted by the integration of laser technology and digital manufacturing technology.joining and cutting technology, namely, laser welding, laser cutting, laser drilling, and laser markingThe problems faced by the development of the laser joining and cutting technology are discussed.unit, laser materials processing, and intelligent integration.

Keywords： laser material processing     laser welding     laser cutting     laser drilling     laser marking    

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Temperature field simulation of laser homogenizing equipment

Juanjuan WANG, Yunshan WANG, Fudong ZHU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 49-52 doi: 10.1007/s11465-009-0005-1

Abstract: The laser homogenizing equipment was devised using the ring scanning principle.A laser scanning ring facula is obtained when the laser beam goes through the equipment’s optical systemhardness layer and better process quality can be attained using the ring facula optimized for metal laser

Keywords： laser homogenizing technology     laser scanning ring facula     temperature field    

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Strategic Research on China’s Laser Technology and Its Application by 2035

Research Group of Strategic Research on China’s Laser Technology and Its Application by 2035

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 1-6 doi: 10.15302/J-SSCAE-2020.03.001

Abstract:

To promote the development of laser technology and its application, theAcademy of Engineering launched a major consulting project “Strategic Research on China’s LaserIt briefly analyzes laser technology and its instrumental, leading, and disruptive role in scientificinnovation ecology of laser industry.cultivation of the laser and optical disciplines.

Keywords： laser technology，laser manufacturing，laser communication，laser diagnosis and treatment    

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Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0703-5

Abstract: In fiber laser beam welding (LBW), the selection of optimal processing parameters is challenging andEM constructs the correlation between processing parameters (laser power, welding speed, and distance

Keywords： laser beam welding     parameter optimization     metamodel     multi-objective    

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Development of lunar regolith composite and structure via laser-assisted sintering

Frontiers of Mechanical Engineering doi: 10.1007/s11465-021-0662-2

Abstract: In this paper, a laser-assisted additive manufacturing process is developed to fabricate lunar regolithcombination of composite material compositions and process parameters are mixing ratio of 50/50 in volume, laserThereafter, the mechanical properties of laser-sintered lunar regolith composites are implemented toThe effectiveness and the feasibility of this laser-assisted process are potentially developed for future

Keywords： in situ manufacturing     laser-assisted powder fusion process     mechanical properties     topological    

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Development of Laser Surface Modification Technology

Zhang Qunli, Wang Liang, Mei Xuesong, Yao Jianhua

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 71-77 doi: 10.15302/J-SSCAE-2020.03.010

Abstract:

The laser surface modification technology uses high-energy-density laserAfter decades of development, laser surface modification technology has been widely applied to aerospaceTaking three typical laser surface modification technologies—laser shock processing, laser quenchingsurface modification, on-site laser remanufacturing, laser shock processing with controlled shape andperformance, intelligent laser surface modification, and laser surface micro-structure preparation.

Keywords： laser surface modification     laser shock processing     laser quenching     laser cladding     development trend    

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Advances in polishing of internal structures on parts made by laser-based powder bed fusion

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0724-0

Abstract: Considering the manufacturing of inner structures, laser-based powder bed fusion (L-PBF) is an attractive

Keywords： laser-based powder bed fusion     polishing     internal structures     surface quality     surface features     post    

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zone-layered trimming method for ceramic core of aero-engine blade based on an advanced reconfigurable laser

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0675-5

Abstract: This paper proposes an ultrafast laser processing system for trimming complex ceramic structural partsOpto-electromechanical cooperative control software is developed to control the laser processing systemThe results show that the laser system and the method proposed in this paper are suitable for trimming

Keywords： ceramic parts trimming     computer-aided laser manufacturing     3D vision     reconfigurable laser processing    

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Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4,   Pages 393-401 doi: 10.1007/s11465-019-0550-1

Abstract: The method combines digital patternless casting and high-power laser cladding.Results prove that the laser cladding layer exceeds HRC60 (Rockwell hardness) and thus meets the production

Keywords： patternless casting     laser cladding     hybrid forming     rapid tooling    

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Title Author Date Type Operation

Microwave－Optical Frequency Standards at NIM：Realizing of Definition of Metre and Second

Li Tianchun

Journal Article

A Smart Procedure for the Femtosecond Laser-Based Fabrication of a Polymeric Lab-on-a-Chip for Capturing

Annalisa Volpe, Udith Krishnan, Maria Serena Chiriacò, Elisabetta Primiceri, Antonio Ancona, Francesco Ferrara

Journal Article

Distribution of PCDD/Fs in a food waste anaerobic digestion process with biogas utilization

Journal Article

PCDD/Fs emission, risk characterization, and reduction in China’s secondary copper production industry

Haiqian LI, Yonglong LU, Li LI

Journal Article

Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample (ASKAREL Nr 1740) from an

Jun HUANG, Yamei HUI, Toru MATSUMURA, Gang YU, Shubo DENG, Makoto YAMAUCHI, Changmin WU, Norimasa YAMAZAKI

Journal Article

study on low temperature thermal treatment of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs

YAN Jianhua, CHEN Tong, LU Shengyong, LI Xiaodong, GU Yueling, CEN Kefa

Journal Article

Development of Laser Cutting and Joining Processing

Chen Li, Gong Shuili, He Enguang

Journal Article

Temperature field simulation of laser homogenizing equipment

Juanjuan WANG, Yunshan WANG, Fudong ZHU

Journal Article

Strategic Research on China’s Laser Technology and Its Application by 2035

Research Group of Strategic Research on China’s Laser Technology and Its Application by 2035

Journal Article

Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Journal Article

Development of lunar regolith composite and structure via laser-assisted sintering

Journal Article

Development of Laser Surface Modification Technology

Zhang Qunli, Wang Liang, Mei Xuesong, Yao Jianhua

Journal Article

Advances in polishing of internal structures on parts made by laser-based powder bed fusion

Journal Article

zone-layered trimming method for ceramic core of aero-engine blade based on an advanced reconfigurable laser

Journal Article

Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Journal Article