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Modelling of wind power forecasting errors based on kernel recursive least-squares method

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Journal of Modern Power Systems and Clean Energy 2017年第5期5卷 735-745页

作者： Man XU Zongxiang lu Ying qiao Yong MIN State Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityHaidian DistrictBeijing 100084China

Forecasting error amending is a universal solution to improve short-term wind power forecasting accuracy no matter what specific forecasting algorithms are applied. The error correction model should be presented considering not only the nonlinear and non-stationary characteristics of forecasting errors but also the field application adaptability problems. The kernel recursive least-squares(KRLS) model is introduced to meet the requirements of online error correction. An iterative error modification approach is designed in this paper to yield the potential benefits of statistical models, including a set of error forecasting models. The teleconnection in forecasting errors from aggregated wind farms serves as the physical background to choose the hybrid regression variables. A case study based on field data is found to validate the properties of the proposed approach. The results show that our approach could effectively extend the modifying horizon of statistical models and has a better performance than the traditional linear method for amending short-term forecasts.

关键词： Forecasting error amending Kernel recursive least-squares(KRLS) Spatial and temporal teleconnection Wind power forecast

Oxidation resistance 1 （OXR1） participates in silkworm defense against bacterial infection through the JNK pathway

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Insect Science 2017年第1期24卷 17-26页

作者： Li-De Su qiao-Ling Zhang Zhiqiang lu Department of Entomology College of Plant Protection Ministry of Education Northwest A &F University Yangling Shaanxi 712100 China Key Laboratory of Plant Protection Resources and Pest Management Ministry of Education Northwest A &F University Yangling Shaanxi 712100 China

Bacterial infection causes enhanced reactive oxygen species （ROS） levels in insects. Oxidation resistance 1 （OXR1） plays an antioxidant role in eukaryotic organisms, including insects. In this report, we demonstrated that Pseudomonas aeruginosa and Staphylococcus aureus infection and hydrogen peroxide （H2O2） injection induced the expression of specific transcriptional isoforms of OXR1 in larval silkworms. We further showed that a jun kinase （JNK） pathway inhibitor, SP600125, down-regulated expression of OXRI during infection, leading to elevated H2O2 levels in the hemolymph, resulting in lower viability of the injected bacteria inside the silkworm larvae. Our study suggests that OXR1 participates in protecting larval silkworms from oxidative stress and bacterial infection through the JNK pathway.

关键词： Bombyx mori infection jun kinase pathway oxidation resistance 1 reactive oxygen species

Metagenomic analysis on resistance genes in water and microplastics from a mariculture system

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Frontiers of Environmental Science & Engineering 2022年第1期16卷 77-89页

作者： Jian lu jun Wu Jianhua Wang CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Shandong Key Laboratory of Coastal Environmental ProcessesYICCASYantai 264003China Yantai Research Institute Harbin Engineering UniversityYantai 264006China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Microplastics existing widely in different matrices have been regarded as a reservoir for emerging *** systems have been observed to host microplastics and antibiotic resistance genes(ARGs).However,more information on proliferation of ARGs and metal resistance genes(MRGs)in mariculture system at the presence of microplastics is *** study used metagenomic analysis to investigate the distribution of ARGs and MRGs in water and microplastics of a typical mariculture *** 18 types including 174 subtypes of ARGs were detected with the total relative abundances of 1.22/1.25 copies per 16S rRNA copy for microplastics/*** resistance genes were the dominant ARGs with the abundance of 0.35/0.42 copies per 16S rRNA copy for microplastics/*** intI1 was dominant gene among 6 detected mobile genetic elements(MGEs)with the abundance of 75.46/68.70 copies per 16S rRNA copy for water/*** 9 types including 46 subtypes of MRGs were detected with total abundance of 5.02×10^(2)/6.39×10^(2)copies per 16S rRNA copy for water/microplastics while genes resistant to copper and iron served as the dominant ***,Bacteroidetes,and Actinobacteria accounted for 84.2%/89.5%of total microbial community in microplastics/*** with relatively high abundance were significantly positively related to major genera,MGEs,and *** in mariculture system could enrich most of MRGs and some ARGs to serve as potential reservoir for these *** findings of this study will provide important information on resistance gene pollution at presence of microplastics in the mariculture system for further proposing suitable strategy of environmental management.

关键词： Antibiotic resistance genes Metal resistance genes Metagenomic analysis Microplastics Mariculture

A Model-Based Unmatched Disturbance Rejection Control Approach for Speed Regulation of a Converter-Driven DC Motor Using Output-Feedback

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IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 365-376页

作者： lu Zhang jun Yang Shihua Li School of Automation Southeast UniversityKey Laboratory of Measurement and Control of Complex Systems of EngineeringMinistry of Education IEEE Department of Aeronautical and Automotive Engineering Loughborough University

The speed regulation problem with only speed measurement is investigated in this paper for a permanent magnet direct current(DC)motor driven by a buck *** lumping all unknown matched/unmatched disturbances and uncertainties together,the traditional active disturbance rejection control(ADRC)approach provides an intuitive solution for the problem under ***,for such a higher-order disturbed system,the increase of poles for the extended state observer(ESO)therein will lead to drastically growth of observer gains,which causes severe noise *** paper aims to propose a new model-based disturbance rejection controller for the converter-driven DC motor system using *** of estimating lumped disturbances directly,a new observer is constructed to estimate the desired steady state of control signal as well as errors between the real states and their desired steady-state ***,a controller with only speed measurement is proposed by utilizing the *** performance of the proposed method is tested through experiments on *** is further shown via numerical calculations and experimental results that the poles of the observer within the proposed control approach can be largely increased without significantly increasing magnitude of the observer gains.

关键词： Bandwidth widening converter-driven direct current(DC)motor disturbance observer model-based disturbance rejection speed regulation

Constructing Rough Set Based Unbalanced Binary Tree for Feature Selection

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Chinese Journal of Electronics 2014年第3期23卷 474-479页

作者： lu Zhengcai QIN Zheng JIN qiao LI Shengnan Department of Computer Science and Technology Tsinghua University School of Software Tsinghua University

Feature selection is one of the challenging problems facing data analysis in areas such as pattern recognition, data mining, and decision support. Many rough set algorithms for feature selection have been developed, most of which are essentially dependent on the definite information contained within the lower approximation. This paper proposes a novel approach, called Unbalanced binary tree based feature selection(UBT-FS), which utilizes the indefinite information contained within rough set boundary region for reduction. UBT-FS designs the underlying mechanism for obtaining the boundary region from the unbalanced binary tree and adopts the boundary region based significance for determining the optimal search path as well as the boundary region based evaluation criterion for identifying feature subsets. These allow UBT-FS to have considerable ability in finding an optimal or suboptimal reduct whilst simultaneously achieving obviously better computational efficiency than other available algorithms, which is also supported by the experimental results.

关键词： Feature selection Rough set theory Boundary region Unbalanced binary tree

Adsorption and desorption of steroid hormones on saline soil

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Frontiers of Environmental Science & Engineering 2022年第11期16卷 177-190页

作者： Jie Wu Jian lu jun Wu CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Shandong Key Laboratory of Coastal Environmental Processes Yantai 264003China University of Chinese Academy of Sciences Beijing 100049China Yantai Research Institute Harbin Engineering UniversityYantai 264006China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Soil organic matter content was the main driving factor affecting adsorption and desorption process of 17β-estradiol(E2)and 17α-ethynylestradiol(EE2)on saline *** adsorption and desorption of E2 and EE2 on three saline soils showed the similar behavior that soil with the highest organic content possessed the highest adsorption capacity and the lowest desorption capacity for E2 and *** adsorption capacity of untreated soil samples(with organic matter)was larger than that of soil samples without organic *** soil with the largest adsorption capacity,adsorption capacity of E2/EE2 on the untreated soil and soil colloid(with organic matter)respectively reached 0.15/0.30μg/g and 0.16/0.33μg/g while the soil and soil colloid without organic matter hardly adsorbed *** adsorption capacity of E2/EE2 at the initial concentration of 100μg/L was 25/15 times higher than that at the initial concentration of 5μg/L.E2 and EE2 had the same adsorption sites on saline soil while EE2 possessed higher competition intensity for adsorption sites than ***-first-order model(R^(2)=0.995–0.986)and Langmuir model(R^(2)=0.989–0.999)could better fit the adsorption process of E2 or *** thermodynamic study further showed that the adsorption of E2/EE2 on saline soil was a spontaneous exothermic *** desorption capacity of EE2/E2 accounted for 40%/78%of the total adsorption capacity to possibly exert potential risk to the *** variation of the salinity led to the variation of soil organic carbon which subsequently changed the adsorption and desorption behaviors of endocrine disrupting chemicals in coastal saline *** study provides a new insight on the interfacial behavior of endocrine disrupting chemicals on saline soil.

关键词： Saline soil Steroid hormones Adsorption Desorption Soil organic matter

A fully solid-state cold thermal energy storage device for car seats using shape-memory alloys

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Frontiers in Energy 2023年第4期17卷 504-515页

作者： Yian lu Suxin QIAN jun SHEN Department of Refrigeration and Cryogenic Engineering Xi’an Jiaotong UniversityXi’an710049China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

Thermal energy storage has been a pivotal technology to fill the gap between energy demands and energy *** a solid-solid phase change material,shape-memory alloys(SMAs)have the inherent advantages of leakage free,no encapsulation,negligible volume variation,as well as superior energy storage properties such as high thermal conductivity(compared with ice and paraffin)and volumetric energy density,making them excellent thermal energy storage *** these characteristics,the design of the shape-memory alloy based the cold thermal energy storage system for precooling car seat application is introduced in this paper based on the proposed shape-memory alloy-based cold thermal energy storage *** simulation results show that the minimum temperature of the metal boss under the seat reaches 26.2°C at 9.85 s,which is reduced by 9.8°C,and the energy storage efficiency of the device is 66%.The influence of initial temperature,elastocaloric materials,and the shape-memory alloy geometry scheme on the performance of car seat cold thermal energy storage devices is also *** SMAs are both solid-state refrigerants and thermal energy storage materials,hopefully the proposed concept can promote the development of more promising shape-memory alloy-based cold and hot thermal energy storage devices.

关键词： shape-memory alloy(SMA) elastocaloric effect(eCE) cooled seat cold thermal energy storage

Effect of low-temperature treatment on bacterial cultivation in bacterial induced mineralization

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Science China(Technological Sciences) 2022年第4期65卷 870-881页

作者： WANG lu LIU ShuHua REN jun State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China School of Architecture and Planning Yunnan UniversityKunming 650051China

In this paper,the effect of low-temperature treatment on bacterial activity was investigated and its performance in preparing the consolidated sand was *** factors,including absorbance(OD600),p H,electric conductivity(EC)and urease activity(UA)were monitored to evaluate the bacterial ***,the calcium carbonate yields under different bacterial solution and cementation solution volume ratios were ***,the compressive strength and microstructure of consolidated sand were investigated and the mechanism was explored by characterising the products among sand *** results showed that for both continuous and interval cultivation of bacteria,stable bacterial solution was harvested within the cultivation period of 30 ***-temperature treatment showed limited inhibition at early cultivation stage,while it had strong inhibition at middle cultivation *** interval cultivation improved the cultivation efficiency of *** was observed that the low-temperature preservation for a stable bacterial solution has little influence on UA before 4 days,while UA decreased seriously after its preservation time was extended to over 8 *** optimal volume ratio of bacterial solution and substrate solution was 1:1,resulting in the highest calcium carbonate *** improved compressive strength of consolidated sand after 3 injections was attributed to the irregular-shaped calcite products,which coated and bonded the sand grains together.

关键词： microbial mineralization cultivation methods low-temperature treatment bacterial activity microstructure

3D trajectory inversion of an adjacent well using scattered P-wave

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Petroleum Science 2023年第2期20卷 857-865页

作者： lu Cheng Xiao-Hua Che Wen-Xiao qiao Teng Zhao State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Key Laboratory of Earth Prospecting and Information Technology Beijing102249China

In oil and gas exploitation,cluster well technology can significantly reduce costs and improve *** effective adjacent well detection method can greatly reduce the risk of collision between adjacent *** study proposes a method to invert the 3D trajectory of an adjacent well using a scattered P-wave obtained by borehole azimuthal acoustic reflection *** obtaining the scattered P-wave from the raw data of the target well using the wave field separation technology,the waveform data in an imaging profile can be obtained by the downhole acoustic directional reception *** imaging technology is then used to obtain the image of the formation in the imaging ***,by analyzing the images of the formation in the imaging profile of the different azimuths,the well spacing and azimuth of the target well can be ***,the 3D trajectory of the target well can be obtained by solving the inversion *** method was validated by processing the field data from a deviated well in a deep *** comparison of the inversion and actual trajectories of the target well demonstrated that the maximum deviation of the inversion trajectory is 0.9 m in the north-south direction,0.78 m in the east-west direction,1.45 m in the well spacing,and 2.48°in the *** field data inversion result demonstrated that the method can effectively use the azimuth reflection acoustic data to invert the 3D trajectory of an adjacent well,which indicates that the borehole azimuthal acoustic reflection imaging technology has great potential within the context of adjacent well detection.

关键词： Acoustic imaging Acoustic reflection logging Directional reception Adjacent well