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127 results on '"Wang, Jiqin"'

9. Comparative effectiveness of technical and regulatory innovations to reduce the burden of electronic waste

Author

Chen, Shuyuan, Wang, Rong, Wang, Jiqin, Shu, Jiancheng, Chen, Mengjun, and Ogunseitan, Oladele A

Subjects
Environmental Sciences, Pollution and Contamination, Patient Safety, Cancer, Responsible Consumption and Production, E-waste, Life cycle analysis, Regulatory policies, Technical innovation, Toxic Chemicals, Engineering, Built Environment and Design, Built environment and design, Environmental sciences
Abstract

Waste Electrical and Electronic Equipment (WEEE) contain toxic metals and organic compounds, posing significant threats to human health and environmental quality. The risks vary according to equipment types and components that are influenced by innovations in technical configuration and regulatory policy. To disentangle the relative impacts of these influences in protecting health and environment, we investigated 13 WEEE and 14 components using a life cycle impact assessment procedure. Additionally, we analyzed Waste Mobile Phones (WMPs) and Waste Printed Circuit Boards (WPCBs) from computers manufactured between 2002 and 2010 to identify trends of toxic chemicals and potential adverse impacts associated with technological configurations and regulatory policies. The results show that, among WEEE, Cathode Ray Tube TV presented the highest carcinogenicity and non-carcinogenicity toxicity potential. Waste Air Conditioner posed the highest potential for ecotoxicity. Among electronic components, Waste Organic Light Emitting Diode displays posed the highest potential risk for carcinogenesis, whereas WPCBs from laptop computers posed the highest potential risk for non-cancer diseases. Solid State Drives posed the highest risks for ecotoxicity. Chromium was associated with risk of carcinogenesis and non-cancer diseases; whereas Al and Fe posed the highest potential for ecotoxicological impacts. During the period covered by the study, innovations in technological configurations and regulatory policies demonstrably reduced the potential toxicity risks posed by E-waste, attributable to reduction in the concentrations of toxic organic chemicals in WMPs/WPCBs. These results advance current understanding of strategies to reduce the risks posed by WEEE through coordination of technological innovations and regulatory policies.

Published
2021

25. The All-Solid-State Narrowband Lidar Developed by Optical Parametric Oscillator/Amplifier (OPO/OPA) Technology for Simultaneous Detection of the Ca and Ca + Layers.

Author

Du, Lifang, Zheng, Haoran, Xiao, Chunlei, Cheng, Xuewu, Wu, Fang, Jiao, Jing, Xun, Yuchang, Chen, Zhishan, Wang, Jiqin, and Yang, Guotao

Subjects
OPTICAL parametric oscillators, TRANSMITTERS (Communication), LIDAR, ND-YAG lasers, COHERENCE (Optics), OPTICAL parametric amplifiers
Abstract

We report an all-solid-state narrowband lidar system for the simultaneous detection of Ca and Ca+ layers over Yanqing (40.41°N, 116.01°E). The uniqueness of this lidar lies in its transmitter, which is based on optical parametric oscillation (OPO) and optical parametric amplification (OPA) techniques. The injection seeded OPO and the OPA are pumped by the second harmonic of an injection-seeded Nd:YAG laser, which can generate coherent light at the wavelength of 786 nm or 846 nm lasers, whose second harmonics in turn generate the 393 nm or 423 nm pulses, respectively, for the detection of thermospheric and ionospheric Ca+ and Ca layers. Compared to the conventional dye-based system, this lidar transmitter is a narrowband system (bandwidth < 200 MHz), which has produced a factor of two more output power with higher stability and reliability. The lidar system in Yingqing demonstrated Ca+ detection sensitivity of 0.1 atoms-cm−3 for long-term observation and reached a height of ~300 km. Potential applications and further improvements in this lidar technique are also discussed in this paper. [ABSTRACT FROM AUTHOR]

Published
2023
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29. 基于分光延时的脉冲激光波形调节方法研究

Author

尹宇阳 Yin Yuyang, 叶晖 Ye Hui, 程学武 Cheng Xuewu, 季凯俊 Ji Kaijun, 王积勤 Wang Jiqin, 梁嘉明 Liang Jiaming, 季凯杰 Ji Kaijie, 林鑫 Lin Xin, 杨勇 Yang Yong, 刘林美 Liu Linmei, and 李发泉 Li Faquan

Subjects
Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Published
2023

39. Multichannel Single-Pulse Laser Energy Monitoring Methodology

Author

Yan Wenbing, 闫文兵, primary, Yang Yong, 杨勇, additional, Ji Kaijun, 季凯俊, additional, Ye Hui, 叶晖, additional, Cheng Xuewu, 程学武, additional, Yang Guotao, 杨国韬, additional, Liu Zhongzheng, 刘中正, additional, Wang Jiqin, 王积勤, additional, Lin Xin, 林鑫, additional, Song Shalei, 宋沙磊, additional, Zheng Jinzhou, 郑金州, additional, Xiao Yiran, 肖亦然, additional, Du Lifang, 杜丽芳, additional, and Li Faquan, 李发泉, additional

Published
2020
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41. High Resolution 3-D Imaging of Mesospheric Sodium (Na) Layer Utilizing a Novel Multilayer ICCD Imager and a Na Lidar

Author

Xuewu Cheng, Yuan Xia, Lifang Du, Ji Kaijun, Liu Linmei, Wang Jiqin, Guotao Yang, Faquan Li, Ji Kaijie, Xin Lin, Tao Yuan, and Yong Yang

Subjects
mesospheric Na layer, Number density, Materials science, 010504 meteorology & atmospheric sciences, business.industry, Sodium, chemistry.chemical_element, Cassegrain reflector, 01 natural sciences, Signal, 3-D imaging, Lidar, Optics, chemistry, small-scale dynamics, Temporal resolution, 0103 physical sciences, General Earth and Planetary Sciences, Focal length, lcsh:Q, lcsh:Science, business, 010303 astronomy & astrophysics, Layer (electronics), 0105 earth and related environmental sciences
Abstract

Equipped with a 1-meter Cassegrain telescope with 6.2 meter focal length and an electronically gated Intensified Charge-Coupled Device (ICCD), a multilayer Na imager is designed and developed at Wuhan in China. This novel instrument has successfully achieved the first preliminary 3-D image of the mesospheric Sodium (Na) layer when running alongside a Na lidar. The vertical Na layer profile is measured by the lidar, while the horizontal structure of the layer at different altitudes is measured by the ICCD imaging with a horizontal resolution of ~3.7 urad. In this experiment, controlled by the delay and width of the ICCD gating signal, the images of the layer are taken with three-second temporal resolution for every 5 km. The results show highly variable structures in both the vertical and horizontal directions within the Na layer. Horizontal images of the Na layer at different altitudes near both the permanent layer (80–100 km) and a sporadic Na layer at 117.5 km are obtained simultaneously for the first time. The Na number density profiles measured by the lidar and those derived from this imaging technique show excellent agreement, demonstrating the success of this observational technique and the first 3-D imaging of the mesospheric Na layer.

Published
2020

42. Multichannel Single-Pulse Laser Energy Monitoring Methodology

Author

Ji Kaijun, Du Lifang, Yang Guotao, LI Fa-quan, Liu Zhongzheng, Wang Jiqin, Lin Xin, Zheng Jinzhou, Yan Wenbing, Xiao Yiran, Ye Hui, Cheng Xuewu, Song Shalei, and Yang Yong

Subjects
Materials science, Optics, law, business.industry, Single pulse, Electrical and Electronic Engineering, Laser, business, Atomic and Molecular Physics, and Optics, Energy (signal processing), Electronic, Optical and Magnetic Materials, law.invention
Published
2020

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