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Biomass Ppower generation: A pathway to carbon neutrality

Science of the Total Environment 2024年 933卷

作者： Du, Wei Cui, Zhanpeng Wang, Jinze Qin, Yiming Ye, Jianhuai Lin, Nan Chen, Yuanchen Duan, Wenyan Chang, Zhaofeng Li, Hao Zhang, Peng Pan, Bo Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control Faculty of Environmental Science & Engineering Kunming University of Science & Technology Kunming650500 China Key Laboratory for Earth Surface Processes College of Urban and Environmental Sciences Peking University Beijing100871 China School of Energy and Environment City University of Hong Kong SAR 999077 Hong Kong Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen China Department of Environmental Health School of Public Health Shanghai Jiao Tong University Shanghai200025 China Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of Environment Zhejiang University of Technology Zhejiang Hangzhou310032 China

In light of the pressing need to reduce carbon emissions, the biomass power generation industry has gained significant attention and has increasingly become a crucial focus in China. However, there are still considerable gaps in the historical background, status, and prospects of biomass power generation. Herein, the historical and current status of biomass power generation in China are systematically reviewed, with a particular emphasis on supportive policies, environmental impacts, and future projections. By 2022, the newly installed capacity for biomass power generation reached 3.34 MW with a total installed capacity of 41 MW. The power produced from biomass power generation is 182.4 billion kWh in China. The total installed capacity and generated power in 2022 were 1652 and 1139 folds higher than in 2006 when the first biomass generation plant was established. However, disparities in the distribution of biomass resources and power generation were observed. Key drivers of the industry development include tax, finance, and subsidy policies. Under the implementation of the 14th Five-Year Plan for renewable energy development and the goal of carbon neutrality, biomass power generation may achieve great success through more targeted policy support and advanced technologies that reduce air pollutant emissions. If combined with Bioenergy with Carbon Capture and Storage (BECCS) technology, biomass power generation will make its contribution to carbon neutrality in China. © 2024 Elsevier B.V.

关键词： Greenhouse gases

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Dual-wavelength mode-locked erbium-doped fiber laser based on tungsten ditelluride coated fiber taper

Dual-wavelength mode-locked erbium-doped fiber laser based o...

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Frontiers in Optics + Laser Science 2021, FiO+LS 2021 - Part of Frontiers in Optics, FiO 2021

作者： Liu, Ya Yang, Jie Zhu, Zhigao Tan, Xin Hu, Guoqing Yan, Peiguang Yunnan Key Laboratory of Opto-Electronic Information Technology School of Physics and Electronic Information Technology Yunnan Normal University Kunming650500 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science & Technology University Beijing100192 China Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science & Technology University Beijing100016 China College of Optoelectronic Engineering Shenzhen University Shenzhen518060 China

A dual-wavelength mode-locked fiber laser based on a polarization-dependent tungsten ditelluride coated fiber taper is demonstrated. Mode-locking at ~1530 nm and ~1556 nm simultaneously could be realized by simply tun... 详细信息

ISBN: (纸本)9781557528209

关键词： Fiber lasers

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Navigation-grade interferometric air-core antiresonant fibre optic gyroscope with enhanced thermal stability

arXiv

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arXiv 2024年

作者： Li, Maochun Gao, Shoufei Sun, Yizhi Zhao, Xiaoming Luo, Wei Hu, Qingbo Chen, Hao Wu, Helin Hui, Fei Wang, Yingying Yan, Miao Ding, Wei Tianjin Key Laboratory of Quantum Precision Measurement Technology Tianjin Navigation Instruments Research Institute Tianjin300131 China Guangdong Provincial Key Laboratory of Optical Fibre Sensing and Communication Institute of Photonics Technology Jinan University Guangzhou510632 China College of Physics & Optoelectronic Engineering Jinan University Guangzhou510632 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Co. Ltd. Jiangsu226010 China Peng Cheng Laboratory Shenzhen518055 China

We present a groundbreaking navigation-grade interferometric air-core fibre optic gyroscope (IFOG) using a quadrupolar-wound coil of four-tube truncated double nested antiresonant nodeless fibre (tDNANF). This state-of-the-art tDNANF simultaneously achieves low loss, low bend loss, single-spatial-mode operation, and exceptional linear polarization purity over a broad wavelength range. Our 469 m tDNANF coil demonstrated a polarization extinction ratio (PER) of ~20 dB when illuminated by an amplified spontaneous emission (ASE) source spanning 1525-1565 nm. Under these conditions, the gyro archives an angular random walk (ARW) of 0.0038 deg h-1/2 and a bias-stability (BS) drift over 8500 s of 0.0014 deg h-1, marking the first instance of navigation-grade performance in air-core FOGs. Additionally, we validated the low thermal sensitivity of air-core FOGs, with reductions of 9.24/10.68/6.82 compared to that of conventional polarization-maintaining solid-core FOGs of the same size across various temperature ranges. These results represent a significant step towards long-standing promise of high-precision inertial navigation applications with superior environmental adaptability. Copyright © 2024, The Authors. All rights reserved.

关键词： Gyroscopes

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A Unified NOMA Framework in Beam-Hopping Satellite Communication Systems

arXiv

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arXiv 2024年

作者： Zhang, Xuyang Yue, Xinwei Li, Tian Han, Zhihao Wang, Yafei Ding, Yong Liu, Rongke The Key Laboratory of Information and Communication Systems Ministry of Information Industry The Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China The 54th Research Institute of China Electronics Technology Group Corporation Hebei Shijiazhuang050081 China The School of Electronic and Information Engineering Beihang University Beijing100191 China Shenzhen Institution of Beihang University Shenzhen518063 China The Baicells Technologies Co. Ltd Beijing100095 China

This paper investigates the application of a unified non-orthogonal multiple access framework in beam hopping (U-NOMA-BH) based satellite communication systems. More specifically, the proposed U-NOMA-BH framework can be applied to code-domain NOMA based BH (CD-NOMA-BH) and power-domain NOMA based BH (PD-NOMA-BH) systems. To satisfy dynamic-uneven traffic demands, we formulate the optimization problem to minimize the square of discrete difference by jointly optimizing power allocation, carrier assignment and beam scheduling. The non-convexity of the objective function and the constraint condition is solved through Dinkelbach’s transform and variable relaxation. As a further development, the closed-from and asymptotic expressions of outage probability are derived for CD/PD-NOMA-BH systems. Based on approximated results, the diversity orders of a pair of users are obtained in detail. In addition, the system throughput of U-NOMA-BH is discussed in delay-limited transmission mode. Numerical results verify that: i) The gap between traffic requests of CD/PD-NOMA-BH systems appears to be more closely compared with orthogonal multiple access based BH (OMA-BH);ii) The CD-NOMA-BH system is capable of providing the enhanced traffic request and capacity provision;and iii) The outage behaviors of CD/PD-NOMA-BH are better than that of OMA-BH. Copyright © 2024, The Authors. All rights reserved.

关键词： Satellite communication systems

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High-Precision 3D Printing by Deploying Expandable Microspheres

SSRN

引用

SSRN 2024年

作者： Xu, Yang Wang, Fucheng Zhang, Pei Lu, Chengbang Liu, Weixuan Guo, Yueying Ni, Zhipeng Wang, Jinqing Lu, Baoyang Lou, Qin Liang, Xiangyu Liu, Ji Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China Department of Metrology and Measurement Engineering China Jiliang University Hangzhou310018 China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural Sciences Shenzhen518120 China Institute of Bast Fiber Crops Center of Southern Economic Crops Chinese Academy of Agricultural Sciences Changsha410205 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen518055 China Yiwu Saiens Polymer Materials Co. Ltd Jinhua322099 China Jiangxi Key Lab of Flexible Electronics Flexible Electronics Innovation Institute Jiangxi Science & Technology Normal University Nanchang330013 China Shenzhen Key Laboratory of Intelligent Robotics and Flexible Manufacturing Systems Southern University of Science and Technology Shenzhen518055 China

Stereolithography-based 3D printing (3DP) technology is widely employed in various industries, including manufacturing, healthcare, energy, biomedical, art and other fields. However, the precision issues, such as dimensional shrinkage and structural warping, significantly hinder its wide applications. In this study, we present a straightforward, efficient yet general strategy to engineer the photosensitive resins with thermally expandable microspheres, thus enabling significant improvement in structural fidelity of the 3DP constructs. Our findings demonstrate that addition of expandable microspheres substantially mitigates the volume shrinkage below 3.98%, in comparison to over 10% for commercially-available photosensitive resins. An exceptionally high precision of 0.035% in dimensional deviation could be achieved, in comparison to over 0.1% for commercial one. Furthermore, due to the low filling ratio, the improvement in 3DP precision does not sacrifice the mechanical properties, thus it does not affect the applications where those photosensitive resins are originally targeting. Our method represents an effective strategy to improve the 3D printing resolution of photosensitive resins, thus opening new directions for high precision 3D printing technology. © 2024, The Authors. All rights reserved.

关键词： Shrinkage

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A quantitative and non-contact technique to detect skin water content based on Mueller matrix polarimetry

A quantitative and non-contact technique to detect skin wate...

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Polarized Light and Optical Angular Momentum for Biomedical Diagnostics 2021

作者： Zhai, Haoyu Huang, Rongrong Shao, Conghui He, Honghui Ma, Hui Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology Shenzhen Key Laboratory for Minimal Invasive Medical Technologies Institute of Optical Imaging and Sensing Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Department of Biomedical Engineering Tsinghua University Beijing100084 China Department of Physics Tsinghua University Beijing100084 China Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen518071 China

ISBN: (数字)9781510641280

ISBN: (纸本)9781510641273

Water content of stratum corneum has one of the most important biological effects on the physiological function of the skin. Measuring and adjusting the water content can be helpful to understand the physiological state of skin and delay skin aging. However, most existing skin water content analyzers have to contact the skin and the results may be affected by personal usage habits prominently. Mueller matrix polarimetry is sensitive to structural features of tissues. Parameters derived from Mueller matrix can provide the microstructural information quantitatively, such as the sizes of scatterers, the distribution of collagen fibers and so on. In this study, we demonstrate a novel, quantitative, non-contact and in situ technique based on Mueller matrix polarimetry for monitoring the microstructural changes of skin tissues during the process of skin water content reduction. We measure the Mueller matrices of rat skin samples and porcine abdominal skin samples, then analyze the Mueller matrix derived parameters to indicate microstructural changes during the skin water content reduction processes. Comparison between the rat skin samples applied with and without moisturizing cream show that the Mueller matrix derived parameters are potential indicators to reflect the water content of the skin quantitatively. This technique can provide a non-contact detection method and be used to evaluate the change of skin water content when different skin-care cosmetics are used on the skin. © 2021 SPIE

关键词： Polarimeters

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Wave functions in the Critical Phase: a Planar Sierpiński Fractal Lattice

arXiv

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arXiv 2024年

作者： Yao, Qi Yang, Xiaotian Iliasov, Askar A. Katsnelson, Mikhail I. Yuan, Shengjun Shenzhen518045 China Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education School of Physics and Technology Wuhan University Hubei Wuhan430072 China Department of Physics University of Zurich Winterthurerstrasse 190 Zurich8057 Switzerland Institute for Molecules and Materials Radboud University Heijendaalseweg 135 Nijmegen6525 AJ Netherlands Wuhan Institute of Quantum Technology Wuhan430206 China

Electronic states play a crucial role in many quantum systems of moire superlattices, quasicrystals, and fractals. As recently reported in Sierpiński lattices [Phys. Rev. B 107, 115424 (2023)], the critical states are revealed by the energy level-correlation spectra, which are caused by the interplay between aperiodicity and determined self-similarity characters. In the case of the Sierpiński Carpet, our results further demonstrate that there is some degree of spatial overlap between these electronic states. These states could be strongly affected by its ‘seed lattice’ of the generator, and slightly modulated by the dilation pattern and the geometrical self-similarity level. These electronic states are multifractal by scaling the q-order inverse participation ratio or fractal dimension, which correlates with the subdiffusion behavior. In the gene pattern, the averaged state-based multifractal dimension of second-order would increase as its Hausdoff dimension increases. Our findings could potentially contribute to understanding quantum transports and single-particle quantum dynamics in fractals. © 2024, CC BY-NC-ND.

关键词： Electronic states

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Comparative study of influence of imaging resolution on Mueller matrix derived parameters 18

Comparative study of influence of imaging resolution on Muel...

引用

Dynamics and Fluctuations in Biomedical Photonics XVIII 2021

作者： Huang, Rongrong Shen, Yuanxing He, Honghui Ma, Hui Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology Shenzhen Key Laboratory for Minimal Invasive Medical Technologies Institute of Optical Imaging and Sensing Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Department of Biomedical Engineering Tsinghua University Beijing100084 China Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen518071 China Department of Physics Tsinghua University Beijing100084 China

ISBN: (数字)9781510641181

ISBN: (纸本)9781510641174

Mueller matrix polarimetry has been applied to assist the diagnosis of several different types of diseases. The improvement of imaging resolution using objective with high numerical aperture (NA) is important for traditional optical microscope. However, imaging using a high NA objective entails a problem, namely, the field of view (FOV) is smaller and imaging speed is slower. Our previous work found that when using Mueller matrix microscope to obtain the structural features of tissue samples, some information of anisotropic structures, such as the density and orientation distribution of fibers can be revealed by polarization parameters images with relatively low resolution. In this study, we use objectives with different numerical aperture to measure the microscopic Mueller matrix of human healthy breast duct tissues and ductal carcinoma in situ (DCIS) tissues, which have distinct typical fibrous structures. Then a group of image texture feature parameters of Mueller matrix derived parameters images under high and low imaging resolutions are quantitatively compared. The results demonstrate that with the decline of imaging resolution, the fibers density information contained in the texture features of linear retardance δ parameter image are preserved well. While for the azimuthal orientation parameter θ which is closely related to the spatial location, the high imaging resolution to obtain quantitative structural information is still needed. The study provides an important criterion to decide which information of fibrous structures can be extracted accurately using transmission Mueller matrix microscope with low numerical aperture objectives to assist diagnose clinically such as breast ductal carcinoma. © 2021 SPIE.

关键词： Polarimeters

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Multi-Branch Mutual-Distillation Transformer for EEG-Based Seizure Subtype Classification

arXiv

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arXiv 2024年

作者： Peng, Ruimin Du, Zhenbang Zhao, Changming Luo, Jingwei Liu, Wenzhong Chen, Xinxing Wu, Dongrui Belt and Road Joint Laboratory on Measurement and Control Technology Huazhong University of Science and Technology Wuhan430074 China AI Platform Software Engineering Research Center Dongfeng Corporation Research & Development Institute Wuhan430072 China China Electronic System Technology Co. Ltd. Beijing100089 China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen518055 China

Cross-subject electroencephalogram (EEG) based seizure subtype classification is very important in precise epilepsy diagnostics. Deep learning is a promising solution, due to its ability to automatically extract latent patterns. However, it usually requires a large amount of training data, which may not always be available in clinical practice. This paper proposes Multi-Branch Mutual-Distillation (MBMD) Transformer for cross-subject EEG-based seizure subtype classification, which can be effectively trained from small labeled data. MBMD Transformer replaces all even-numbered encoder blocks of the vanilla Vision Transformer by our designed multi-branch encoder blocks. A mutual-distillation strategy is proposed to transfer knowledge between the raw EEG data and its wavelets of different frequency bands. Experiments on two public EEG datasets demonstrated that our proposed MBMD Transformer outperformed several traditional machine learning and state-of-the-art deep learning approaches. To our knowledge, this is the first work on knowledge distillation for EEG-based seizure subtype classification. © 2024, CC BY.

关键词： Electroencephalography

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Calibration of Coherent Optical Fiber Bundle with Lcd Screen for Deformation measurements

SSRN

引用

SSRN 2022年

作者： Tu, Han Zhu, Canyu Gao, Zeren Bai, Chuanbiao Lan, Shihai Zhang, Qingchuan CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection College of Physics and Optoelectronic Engineering Shenzhen University 3688 Nanhai Avenue Shenzhen518060 China

Owning to its flexibility, high temperature resistance, and freedom from electromagnetic interference, coherent optical fiber bundle (COFB) is widely used in special imaging applications. However, limited by the manufacturing process, the fiber arrangement of COFB is prone to misalignment, resulting in imaging distortions that are not easily corrected. This limits the application of COFB in the field of optical measurement, making it difficult to meet the requirements of high-precision deformation measurement. To effectively calibrate the misalignment distortion and recover the original image information, this study proposes an easy-to-implement and highly accurate misalignment distortion calibration method. The LCD screen was used as the calibration reference to display a pre-designed regular arrangement pattern. The mapping relationship between the fiber output and the screen display information was confirmed using a correlation algorithm. The proposed method requires only 36 images to achieve misalignment calibration for 450×450 fibers. The image reconstruction results show that the proposed method can not only achieve global misalignment calibration, but also successfully eliminate honeycomb artifacts, thus enhancing the accuracy and practicality of COFB for deformation measurement. In addition, a COFB-based digital image correlation (DIC) system was established and a set of typical DIC experiments were implemented. The experimental results show that the proposed calibration method can significantly improve the deformation measurement accuracy of the COFB-based DIC system, and the accuracy of the two-dimensional (2D) displacement field measurement result is improved from 0.50 pixels to 0.03 pixels. © 2022, The Authors. All rights reserved.

关键词： Calibration

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