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A Cold Model Experimental Study on the Flow Characteristics of Bed Material in a Fluidized Bed Bottom Ash Cooler in a CFB Boiler

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Journal of Thermal Science 2000年第4期9卷 381-384页

作者： lu xiaofeng,Li Yourong (Institute of Thermal Energy Engineering, Chongqing University, Chongqing, 400044, China) Institute of Thermal Energy Engineering Chongqing University Chongqing China

A cold model experimental study on the flowing characteristics of bed material between a fluidized bed ash cooler and a furnace of CFB boiler were discussed in this paper. The research results showed that flowing status of the bed material in a bubbling bed, which was run with a circulating fluidized bed together in parallel operation, was influenced by the pressure difference between the CFB and the bubbling bed, the switch status of unlocking air, and the structure of the exit of the bubbling bed. There was a circulating flow of bed material between CFB and bubbling bed.

关键词： fluidized bed CFB bottom ash cooler.

Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems

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Science China(Information Sciences) 2023年第5期66卷 227-237页

作者： Ji ZHOU Liangchuan LI Jiale HE xiaofeng lu Yu BO Guanyu WANG Yuanda HUANG Gengchen LIU Yanzhao lu Shecheng GAO Yuanhua FENG Shancheng ZHAO Weiping LIU Changyuan YU Zhaohui LI Department of Electronic Engineering College of Information Science and Technology Jinan University Optical Research Department Huawei Technologies Co. Ltd. Department of Electronic and Information Engineering The Hong Kong Polytechnic University Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

High peak-to-average power ratio(PAPR) is a major drawback of discrete multi-tone(DMT) in peak-power-constraint(PPC) intensity-modulation/direct-detection(IM/DD) optical systems. Symmetric clipping operation is a frequently-used and practical method for mitigating the PAPR of the DMT ***, clipping noise is inevitably induced by the symmetric clipping operation, thereby deteriorating the system’s performance. In this paper, we study the statistical characteristics of the clipping noise in *** on the statistical characteristics, clipping-noise-cancellation(CNC) algorithms are proposed to mitigate the clipping noise in the clipping DMT systems. Theoretically, the clipping noise can be completely removed using the low-density-parity-check-assisted CNC algorithm(LDPC-assisted CNC algorithm). To verify the superiority of the clipping DMT with the CNC algorithm, we conduct an experiment with a50 Gb/s DMT system using 10G-class commercial devices for the scenario of PPC passive optical *** receiver sensitivity of the clipping DMT system with the CNC algorithm can reach-24 d Bm at a 20%soft-decision forward-error-correction limit, which is 2.5 d B higher than that of the DMT system without clipping operation. The clipping operation and the CNC algorithm are added after the original digital signal processing, thereby demonstrating the potential to efectively overcome the drawback in DMT signals and other high-PAPR signals.

关键词： discrete multi-tone peak-to-average power ratio peak-power constraint clipping-noise cancellation intensity-modulation/direct-detection optical systems

Research on Pavement Roughness Based on the Laser Triangulation

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Photonic Sensors 2016年第2期6卷 177-180页

作者： Wenxue CHEN Zhibin NI Xinhan HU xiaofeng lu Equipment Academy of the Rocket Force Beijing 100094 China

Pavement roughness is one of the most important factors for appraising highway construction. In this paper, we choose the laser triangulation to measure pavement roughness. The principle and configuration of laser triangulation are introduced. Based on this technology, the pavement roughness of a road surface is measured. The measurement results are given in this paper. The measurement range of this system is 50 μm. The measurement error of this technology is analyzed. This technology has an important significance to appraise the quality of highway after completion of the workload.

关键词： Pavement roughness laser triangulation measurement

Conducting polymer-based peroxidase mimics:synthesis, synergistic enhanced properties and applications

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Science China Materials 2018年第5期61卷 653-670页

作者： Zezhou Yang Ce Wang and xiaofeng lu. Alan G.MacDiarmid Institute College of Chemistry Jilin University

The concept of artificial enzymes has been proposed for a long time and a large variety of materials have been exploited in enzyme-like catalytic field for decades. The emergence of nanotechnology provides increasing opportu- nities for the development of artificial enzymes. Conducting polymer-based nanocomposites are a new type of burgeoning functional materials as enzyme mimics owing to their nu- merous functional groups, excellent electrical conductivity and redox properties. This review summarizes the recent progress of the synthesis of conducting polymers and their nanocomposites, as well as their applications as efficient peroxidase mimics. After a brief description of the develop- ment of conducting polymers, we specifically introduce the fabrication of conducting polymers and their nanocomposites via diverse approaches and show the enhanced peroxidase-like catalytic properties. In addition, the mechanism of the en- hanced catalytic efficiency of the conducting polymer-based nanocomposites has been proposed. Finally, we highlight the applications of such conducting polymer-based nanocompo- sites in the sensitive detection of different types of substances. It is anticipated that this review will pave the way for devel- oping more intriguing functional nanomaterials as enzyme mimics, which shows promising applications in a great many technological fields.

关键词： conducting polymers artificial enzymes peroxidasemimics nanocomposite synergistic effect

Effect of oil shale semi-coke on deposit mineralogy and morphology in the flue path of a CFB burning Zhundong lignite

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Frontiers in Energy 2021年第1期15卷 26-37页

作者： Zhuo LIU Jianbo LI Mingming ZHU xiaofeng lu Zhezi ZHANG Dongke ZHANG Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of Education Chongqing UniversityChongqing 400044China Centre for Energy(M473) The University of Western Australia35 Stirling HighwayCrawley WA 6009Australia

The effect of oil shale semi-coke(SC)on the mineralogy and morphology of the ash deposited on probes situated in the flue path of a circulating fluidized bed(CFB)which burns Zhundong lignite(ZD)was investigated.10 wt%or 20 wt%SC was added to ZD,which were then combusted in the CFB furnace at 950℃.Two probes with vertical and horizontal orientations were installed in the flue duct to simulate ash *** windward and leeward ash deposits on probes(P_(1)W,P_(1)L,P_(2)W and P_(2)L)were analyzed by using a scanning electron microscopy with energy dispersive X-ray(SEM-EDX),X-ray diffraction(XRD),an inductively coupled plasma optical emission spectrometry ICP-OES,and a particle size *** ZD was burned alone,the P1W deposit was comprised of agglomerates(luminosilicates dominated the mineral phases whereas Na_(2)SiO_(3)and Na_(2)SO_(4)disappeared,showing a decrease in deposit ***,the P2W deposit was found less spread on the probe,decreasing its deposition ***-bearing minerals turned into(Na,K)(Si_(3)Al)O_(8)and(Ca,Na)(Si,Al)4O8 in the P_(2)W ***,Na in the deposits decreased from 32 mg/g to less than 15 mg/g as SC *** addition of SC would therefore help alleviate the propensity of ash deposition in the flue path in the CFB combustion of ZD.

关键词： ash deposition circulating fluidized bed(CFB) mineral transformation oil shale semi-coke(SC) Zhundong lignite(ZD)

The osteoclastic activity in apical distal region of molar mesial roots affects orthodontic tooth movement and root resorption in rats

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International Journal of Oral Science 2024年第2期16卷 322-332页

作者： Wenhao Zheng xiaofeng lu Guangjin Chen Yufeng Shen Xiaofei Huang Jinfeng Peng Jiajia Wang Ying Yin Wencheng Song Mengru Xie Shaoling Yu Lili Chen Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration WuhanChina Department of Stomatology The First Affiliated HospitalSchool of MedicineShihezi UniversityShiheziChina

The utilization of optimal orthodontic force is crucial to prevent undesirable side effects and ensure efficient tooth movement during orthodontic ***,the sensitivity of existing detection techniques is not sufficient,and the criteria for evaluating optimal force have not been yet ***,by employing 3D finite element analysis methodology,we found that the apical distal region(A-D region)of mesial roots is particularly sensitive to orthodontic force in ***-resistant acidic phosphatase(TRAP)-positive osteoclasts began accumulating in the A-D region under the force of 40 grams(g),leading to alveolar bone resorption and tooth *** the force reached 80 g,TRAP-positive osteoclasts started appearing on the root surface in the A-D ***,micro-computed tomography revealed a significant root resorption at 80 ***,the A-D region was identified as a major contributor to whole root *** was determined that 40 g is the minimum effective force for tooth movement with minimal side effects according to the analysis of tooth movement,inclination,and *** findings suggest that the A-D region with its changes on the root surface is an important consideration and sensitive indicator when evaluating orthodontic forces for a rat ***,our investigations into this region would aid in offering valuable implications for preventing and minimizing root resorption during patients’orthodontic treatment.

关键词： movement roots offering

Study on the Influence of AI Composition Software on Students'Creative Ability in Music Education

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教育技术与创新 2024年第2期6卷 1-17页

作者： Shuang Zhang xiaofeng lu Xinwen Liu School of Music Wenzhou UniversityChina Business School of Wenzhou University China School of Fine Arts and Design Wenzhou UniversityChina

Generative AI technology for human-assisted tools has made great strides in recent years,and studying the impact of this technology on students'compositional abilities plays an important role in promoting changes in music *** studies have focused on the performance of music composition software itself in terms of composition,with less consideration given to the impact of creators'compositional ability after using assistive composition ***,this paper designs a controlled experiment to investigate the changes in students'compositional ability before and after using AI composition *** paper finds that students'compositional abilities in all areas of composition improved to varying degrees after using AI composition *** paper compares the differences in compositional abilities of students with and without the education of AI composition tools,which has practical implications for vigorously promoting the adoption of AI composition tools in university music education teaching.

关键词： Music Education AI Composition Composition Ability Assessment

Low intensity near-infrared light promotes bone regeneration via circadian clock protein cryptochrome 1

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International Journal of Oral Science 2022年第4期14卷 584-594页

作者： Jinfeng Peng Jiajia Zhao Qingming Tang Jinyu Wang Wencheng Song xiaofeng lu Xiaofei Huang Guangjin Chen Wenhao Zheng luoying Zhang Yunyun Han Chunze Yan Qian Wan Lili Chen Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration WuhanChina Key Laboratory of Molecular Biophysics of Ministry of Education College of Life Science and TechnologyHuazhong University of Science and TechnologyWuhanChina Department of Neurobiology School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science&TechnologyWuhanChina State key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of PharmacyHuazhong University of Science and TechnologyWuhanChina

Bone regeneration remains a great clinical challenge. Low intensity near-infrared(NIR) light showed strong potential to promote tissue regeneration, offering a promising strategy for bone defect regeneration. However, the effect and underlying mechanism of NIR on bone regeneration remain unclear. We demonstrated that bone regeneration in the rat skull defect model was significantly accelerated with low-intensity NIR stimulation. In vitro studies showed that NIR stimulation could promote the osteoblast differentiation in bone mesenchymal stem cells(BMSCs) and MC3T3-E1 cells, which was associated with increased ubiquitination of the core circadian clock protein Cryptochrome 1(CRY1) in the nucleus. We found that the reduction of CRY1 induced by NIR light activated the bone morphogenetic protein(BMP) signaling pathways, promoting SMAD1/5/9 phosphorylation and increasing the expression levels of Runx2 and Osterix. NIR light treatment may act through sodium voltage-gated channel Scn4a, which may be a potential responder of NIR light to accelerate bone regeneration. Together, these findings suggest that low-intensity NIR light may promote in situ bone regeneration in a CRY1-dependent manner, providing a novel, efficient and non-invasive strategy to promote bone regeneration for clinical bone defects.

关键词： stimulation intensity light

基于深度优先多径参数估计的NLOS定位增强算法

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通信学报 2023年第8期44卷 99-110页

作者：卢小峰董晔李越杰西安电子科技大学空天地一体化综合业务网全国重点实验室陕西西安710071

为了提高非视距(NLOS)环境中的毫米波系统定位精度,基于分布式压缩感知理论,提出一种深度优先的多路径参数估计算法。通过估计出来的多径参数来识别NLOS路径,增强了定位性能。首先,使用深度优先算法来减少非必要的路径搜索,获得更加准... 详细信息

为了提高非视距(NLOS)环境中的毫米波系统定位精度,基于分布式压缩感知理论,提出一种深度优先的多路径参数估计算法。通过估计出来的多径参数来识别NLOS路径,增强了定位性能。首先,使用深度优先算法来减少非必要的路径搜索,获得更加准确的多径参数。其次,采用反向定位距离残差的方法进行NLOS多径识别。然后,对NLOS路径中的散射体进行匹配,估计出散射体的位置并将其视为虚拟锚节点。结合基站与虚拟锚节点的信息实现定位增强。最后,对所提算法的定位性能进行了仿真,与距离加权最小二乘(LS)算法和最大鉴别变换(MDT)算法相比,所提算法的性能分别提升了17%和8%。

关键词：毫米波深度优先多径识别虚拟锚节点定位增强

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