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Red soil for sediment capping to control the internal nutrient release under flow conditions

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Frontiers of Environmental Science & Engineering 2016年第6期10卷 63-71页

作者： Lei Xia Guo Liu Chunmei Chen Meiyan Wen yangyang gao State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Sichuan Provincial Environmental Protection Key Laboratory of Groundwater Pollution Prevention and Resource Security Chengdu University of Technology Chengdu 610059 China

Nitrogen （N） and phosphorus （P） released from the sediment to the surface water is a major source of water quality impairment. Therefore, inhibiting sediment nutrient release seems necessary. In this study, red soil （RS） was employed to control the nutrients released from a black-odorous river sediment under flow conditions. The N and P that were released were effectively controlled by RS capping. Continuous-flow incubations showed that the reduction efficiencies of total N （TN）, ammonium （NH4＋-N）, total P （TP） and soluble reactive P （SRP） of the overlying water by RS capping were 77%, 63%, 77% and 92%, respectively, and nitrification and denitrification occurred concurrently in the RS system. An increase in the water velocity coincided with a decrease in the nutrient release rate as a result of intensive water aeration.

关键词： Sediment Red soil capping Flow conditions Nitrogen Phosphorus

Experimental Study on the Flow Around Two Tandem Cylinders with Unequal Diameters

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Journal of Ocean University of China 2014年第5期13卷 761-770页

作者： gao yangyang ETIENNE Stephane WANG Xikun TAN Soon Keat Ocean College Zhejiang University State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography SOA Mechanical Engineering Department Ecole Polytechnique de Montreal Maritime Research Centre and School of Civil and Environmental Engineering Nanyang Technological University

In this paper, flow around two circular cylinders in tandem arrangement with unequal diameters has been investigated using the particle image velocimetry technique(PIV) in a water channel. The upstream to downstream diameter ratio was kept constant at d/D = 2/3, the centre-to-centre distance was varied from 1.2D to 5D and the Reynolds number was varied from 1200 to 4800. The flow characteristics were analyzed through ensemble-averaged patterns of velocity, vorticity, normalized Reynolds stress contours and streamlines. Based on ensemble-averaged and instantaneous flow fields, different flow patterns, including single-wakeshedding at small spacing ratio, bi-stable flow behavior(alternating behavior of reattachment and vortex shedding) at intermediate spacing ratio and co-shedding pattern at large spacing ratio were observed. The effects of Reynolds number and the centre-to-centre spacing ratio on flow patterns and turbulent characteristics were also investigated. It was found that the diameter ratio appears to have a certain effect on the flow patterns at intermediate spacing ratios, where the reattachment of shear layer depends on the lateral width of the wake flow in the lee of the upstream cylinder. Extensive discussion on the distributions of Reynolds stress and turbulent kinetic energy was presented.

关键词： tandem cylinders with unequal diameters PIV flow patterns Reynolds stress distribution

Numerical Study of an Oscillating Smaller Cylinder in the Wake of an Upstream Larger Cylinder

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Journal of Ocean University of China 2012年第2期11卷 111-117页

作者： gao yangyang YU Dingyong WANG Xikun TAN Soon Keat Maritime Research Centre School of Civil and Environmental EngineeringNanyang Technological University639798Singapore College of Engineering Ocean University of ChinaQingdao 266100P.R.China Nanyang Environmental and Water Research Institute Nanyang Technological University639798Singapore

A numerical study of flow around two tandem cylinders with unequal diameters was carried out. The upstream larger cylinder was fixed and the downstream smaller cylinder was allowed to oscillate in the transverse direction only. Comparisons of the experimental and numerical results were made to investigate the effects of the gap ratio on the maximum vibration amplitude and vortex shedding frequency. The results showed that the vibration response of the smaller cylinder was significantly affected by the presence of the upstream larger cylinder, and resulted in greatly reduced vibration amplitudes. With an increasing gap ratio, the vibration amplitude increased. However, the magnitude was lower than that corresponding to a single cylinder (with the same diameter as that of the downstream smaller cylinder) under the same flow conditions.

关键词： tandem cylinders with unequal diameters numerical simulation gap ratio vibration amplitude

Enhancing sensitivity of microbial fuel cell sensors for low concentration biodegradable organic matter detection:Regulation of substrate concentration,anode area and external resistance

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Journal of Environmental Sciences 2021年第3期33卷 227-235页

作者： yangyang gao Sha Wang Fengjun Yin Pin Hu Xingzu Wang Yuan Liu Hong Liu Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing100049China

The relatively low sensitivity is an important reason for restricting the microbial fuel cell(MFC)sensors'application in low concentration biodegradable organic matter(BOM)*** startup parameters,including substrate concentration,anode area and external resistance,were regulated to enhance the sensitivity of MFC *** results demonstrated that both the substrate concentration and anode area were positively correlated with the sensitivity of MFC sensors,and an external resistance of 210Ωwas found to be optimal in terms of sensitivity of MFC *** MFC sensors had lower detection limit(1 mg/L)and higher sensitivity(Slope value of the linear regression curve was 1.02),which effectively overcome the limitation of low concentration BOM *** essential reason is that optimized MFC sensors had higher coulombic efficiency,which was beneficial to improve the sensitivity of MFC *** main impact of the substrate concentration and anode area was to regulate the proportion between electrogens and nonelectrogens,biomass and living cells of the anode *** external resistance mainly affected the morphology structure and the proportion of living cells of the *** study demonstrated an effective way to improve the sensitivity of MFC sensors for low concentration BOM detection.

关键词： Microbial fuel cell sensor High sensitivity Biodegradable organic matter Substrate concentration Anode area External resistance

Knowledge Distillation Facilitates the Lightweight and Efficient Plant Diseases Detection Model

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Plant Phenomics 2023年第3期5卷 501-519页

作者： Qianding Huang Xingcai Wu Qi Wang Xinyu Dong Yongbin Qin Xue Wu yangyang gao Gefei Hao State Key Laboratory of Public Big Data College of Computer Science and TechnologyGuizhou UniversityGuiyang 550025China Text Computing&Cognitive Intelligence Engineering Research Center of National Education Ministry Guizhou UniversityGuiyang 550025China National Key Laboratory of Green Pesticide Guizhou UniversityGuiyang 550025China

Plant disease diagnosis in time can inhibit the spread of the disease and prevent a large-scale drop in production,which benefits food *** detection-based plant disease diagnosis methods have attracted widespread attention due to their accuracy in classifying and locating ***,existing methods are still limited to single crop disease *** importantly,the existing model has a large number of parameters,which is not conducive to deploying it to agricultural mobile ***,reducing the number of model parameters tends to cause a decrease in model *** solve these problems,we propose a plant disease detection method based on knowledge distillation to achieve a lightweight and efficient diagnosis of multiple diseases across multiple *** detail,we design 2 strategies to build 4 different lightweight models as student models:the YOLOR-Light-v1,YOLOR-Light-v2,Mobile-YOLOR-v1,and Mobile-YOLOR-v2 models,and adopt the YOLOR model as the teacher *** develop a multistage knowledge distillation method to improve lightweight model performance,achieving 60.4%mAP@.5 in the PlantDoc dataset with small model parameters,outperforming existing ***,the multistage knowledge distillation technique can make the model lighter while maintaining high *** only that,the technique can be extended to other tasks,such as image classification and image segmentation,to obtain automated plant disease diagnostic models with a wider range of lightweight applicability in smart *** code is available at https://***/QDH/MSKD.

关键词： Plant diagnosis image

Calculation of Significant Wave Height Using the Linear Mean Square Estimation Method

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Journal of Ocean University of China 2010年第4期9卷 327-332页

作者： gao yangyang YU Dingyong LI Cuilin XU Delun College of Engineering Ocean University of China Qingdao 266100 P. R. China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266001 P. R. China

Significant wave height is an important criterion in designing coastal and offshore *** on the orthogonality principle, the linear mean square estimation method is applied to calculate significant wave height in this ***-eight-year time series of wave data collected from three ocean buoys near San Francisco along the California coast are *** is proved theoretically that the computation error will be reduced by using as many measured data as possible for the calculation of significant wave *** significant wave height at one buoy location is compared with the calculated value based on the data from two other adjacent *** results indicate that the linear mean square estimation method can be well applied to the calculation and prediction of significant wave height in coastal regions.

关键词： significant wave height linear mean square estimation method orthogonality principle

CPSF30-L-mediated recognition of mRNA m^(6)A modification controls alternative polyadenylation of nitrate signaling-related gene transcripts in Arabidopsis

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Molecular Plant 2021年第4期14卷 688-699页

作者： Yiteng Hou Jing Sun Baixing Wu yangyang gao Hongbo Nie Zhentian Nie Shuxuan Quan Yong Wang Xiaofeng Cao Sisi Li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Depatment of Biology Southerm University of Science and Technology.ShenzhenGuangdong 518055China State Key Laboratory of Crop Biology College of Life SciencesShandong Agicultural UniversityTar'anShandong 271018China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Molecular Plant Sciences Chinese Academy of SciencesBeing 100101China Present address:Guangdong Provinclal Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Guangdong-Hong Kong Joint Laboratory for RNA MedicineRNA Biomedical InstituteMedical Research CenterSun Yat Sen Memorial HospitalSun Yat-Sen UniversityGuangzhou 510120China These authors contributed equaly to this article.

N6-methyladenosine(m^(6)A),a ubiquitous internal modification of eukaryotic mRNAs,plays a vital role in almost every aspect of mRNA ***,there is little evidence documenting the role of m^(6)A in regulating alternative polyadenylation(APA)in *** is controlled by a large protein-RNA complex with many components,including CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR30(CPSF30).In Arabidopsis,CPSF30 has two isoforms and the longer isoform(CPSF30-L)contains a YT512-B Homology(YTH)domain,which is unique to *** this study,we showed that CPSF30-L YTH domain binds to m^(6)A in v *** the cpsf30-2 mutant,the transcripts of many genes including several important nitrate signaling-related genes had shifts in polyadenylation sites that were correlated with m^(6)A peaks,indicating that these gene transcripts carrying m^(6)A tend to be regulated by ***-type CPSF30-L could rescue the defects in APA and nitrate metabolism in cpsf30-2,but m^(6)A-binding-defective mutants of CPSF30-L could *** together,our results demonstrated that m^(6)A modification regulates APA in Arabidops is and revealed that the m^(6)A reader CPSF30-L affects nitrate signaling by controlling APA,shedding new light on the roles of the m^(6)A modification during RNA 3-end processing in nitrate metabolism.

关键词： m^(6)A modification alternative polyadenylation nitrate metabolism CPSF30

Microstructure and Corrosion Resistance of a Novel AlNiLa Lightweight Medium Entropy Amorphous Alloy Composites

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1185-1191页

作者： ZHANG Shuyan ZHANG Zhibin gao yangyang WANG Xin SHEN Baolong LIANG Xiubing Ocean College Zhejiang UniversityZhoushan 316021China Defense Innovation Institute Academy of Military Sciences of the PLA of ChinaBeijing 100071China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China

A new type of lightweight AlNiLa medium entropy amorphous alloy composite ribbons(labled as MEAAC ribbons)were prepared by vacuum arc melting technology and high-speed single roller meltspinning *** microstructure and thermal stability of MEAAC ribbons were examined using X-ray diffraction,differential scanning calorimeter,and scanning electron ***,the hardness and surface roughness of these ribbons were measured by Vickers microhardness tester and atomic force *** potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS)were applied to investigate the corrosion behavior of these MEAAC ribbons in simulated seawater(3.5wt%NaCl corrosive solution)at room *** results demonstrate that AlNiLa MEAAC ribbons in the as-received state are mainly composed of amorphous phase and intermetallic *** hardness values of all melt-spun ribbons are above 310 HV_(0.1).With the increase of Al content,the linear polarization resistances of four various AlNiLa MEAAC ribbons are negligibly different *** is also found that Al_(45)Ni_(27.5)La_(27.5) MEAAC ribbons have the most positive corrosion potential and the smallest corrosion current density at the same time;hence it may be a kind of potential material for metal surface protection in harsh ocean environment.

关键词： medium entropy amorphous alloy composites rapid solidification microstructure corrosion resistance thermal stability

Constructing origami power generator from one piece of electret thin film and application in AIenabled transmission line vibration monitoring

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Microsystems & Nanoengineering 2023年第4期9卷 281-292页

作者： Boming Lyu Huipeng Zhou yangyang gao Xinhui Mao Fangzhi Li Jiyuan Zhang Dezhi Nie Wen Zeng Yonglin Lu Jin Wu Zhaoshu Yang Kai Tao Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical UniversityXi’anPR China Research&Development Institute of Northwestern Polytechnical University in Shenzhen ShenzhenPR China Research Institute of State Grid Jiangsu Electric Power Co. LtdNanjingPR China State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhouPR China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training CenterBeijingPR China

One of the crucial issues for applying electret/triboelectric power generators in the Internet of Things(IoT)is to take full advantage of specific high voltage signals and enable self-powered ***,inspired by Miura-origami,we present an innovative origami power generator(OPG)constructed from only one piece of electret thin *** Miura-origami architecture realizes a generator with excellent deformability and stretchability and makes it unnecessary for any auxiliary support structure during the compress-release *** parameters of the generator are intensively investigated,including the excitation accelerations,excitation displacements,numbers of power generation units and deformation degree of the *** stimulated with 5.0 g acceleration at 15 Hz frequency,the generator with 8 generation units can obtain an instantaneous peak-to-peak voltage and a remarkable optimum peak power of 328 V and 2152μW at 50MΩ,*** addition,the regulable shape and multiple generation modes of the device greatly improve its applicability in various vibration energy collection *** on the above results,a hexagonal electret generator integrated with six-phase OPGs is developed as a“Buoy on Sky,”after which the signal waveforms generated from internal power generators are recognized with 92%accuracy through a neural network algorithm that identifies the vibration conditions of transmission *** work demonstrates that a fusion of origami art and energy conversion techniques can achieve a multifunctional generator design satisfying the requirements for IoT applications.

关键词： power IoT generator