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Improving the Forecasts of Coastal Wind Speeds in Tianjin,China Based on the WRF Model with Machine Learning Algorithms

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Journal of Meteorological Research 2024年第3期38卷 570-585页

作者： Weihang ZHANG Meng TIAN Shangfei HAI Fei WANG Xiadong AN Wanju li xiaodong li lifang SHENG College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao266100China Tianjin Key Laboratory for Oceanic Meteorology Tianjin Institute of Meteorological ScienceTianjin300074China CMA Earth System Modeling and Prediction Centre China Meteorological Administration(CMA)Beijing100081China Qingdao Meteorological Bureau Qingdao266003China

Characterized by sudden changes in strength,complex influencing factors,and significant impacts,the wind speed in the circum-Bohai Sea area is relatively challenging to *** the western side of Bohai Bay,as the economic center of the circum-Bohai Sea,Tianjin exhibits a high demand for accurate wind *** this study,three machine learning algorithms were employed and compared as post-processing methods to correct wind speed forecasts by the Weather Research and Forecast(WRF)model for *** results showed that the random forest(RF)achieved better performance in improving the forecasts because it substantially reduced the model bias at a lower computing cost,while the support vector machine(SVM)performed slightly worse(especially for stronger winds),but it required an approximately 15 times longer computing *** back propagation(BP)neural network produced an average forecast significantly closer to the observed forecast but insufficiently reduced the *** regard to wind speed frequency forecasting,the RF method commendably corrected the forecasts of the frequency of moderate(force 3)wind speeds,while the BP method showed a desirable capability for correcting the forecasts of stronger(force>6)*** addition,the 10-m u and v components of wind(u_(10)and v_(10)),2-m relative humidity(RH_(2))and temperature(T_(2)),925-hPa u(u925),sea level pressure(SLP),and 500-hPa temperature(T_(500))were identified as the main factors leading to bias in wind speed forecasting by the WRF model in Tianjin,indicating the importance of local dynamical/thermodynamic processes in regulating the wind *** study demonstrates that the combination of numerical models and machine learning techniques has important implications for refined local wind forecasting.

关键词： machine learning Weather Research and Forecast(WRF)model wind speed forecasting coastal region

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PCDD/Fs in soil around a hospital waste incinerator:comparison after three years of operation

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Journal of Environmental Sciences 2012年第4期24卷 699-703页

作者： xiaodong li Mi Yan Jie Yang Tong Chen Shengyong Lu Jianhua Yan State Key Laboratory of Clean Energy Utilization Zhefiang UniversityHangzhou 310027China

Polychlorinated dibenzo-p-dioxins and dibenzofurans （PCDD/Fs） can be formed during the cooling of flue gases in waste incinerator. These pollutants are either in the gas phase or attached to the fine particles, escaping dust collection. After stack emission, they are slowly oxidized photochemically （gas phase）, or eventually are deposited （dry and wet deposition of particulate） in earth surface. In 2007 and 2010, 11 soil samples were collected in the vicinity of a hospital waste incinerator （HWI）, prior and after its startup. In order to find out any variation of PCDD/Fs in soil, in brief dioxins, their concentrations were analyzed by high-resolution gas chromatography with high-resolution mass spectrometry （HRGC/HRMS）. Compared to the baseline survey （2007）, PCDD/Fs in soil significantly increased, by average, ＋81.6% in total PCDD/Fs and ＋132.7% in international toxic equivalency （I-TEQ） unit. By principal component analysis （PCA）, both the PCDD/Fs homologue and the HxCDF isomer profile in soil were found to become more similar with fly ash. Generally, this incinerator influences the soil only in a limited area. More comprehensive supervision, stricter management and more advanced technology should be implemented in this plant to reduce pollutants emission, even though the level of PCDD/Fs in soil is quite low at present.

关键词： soil dioxin variation waste incinerator

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Industrial-current-density CO_(2)-to-formate conversion with low overpotentials enabled by disorder-engineered metal sites

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Nano Research 2022年第8期15卷 6999-7007页

作者： Zhiqiang Wang Xiaolong Zu xiaodong li li li Yang Wu Shumin Wang Peiquan ling Yuan Zhao Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

CO_(2)electroreduction to formate is technically feasible and economically viable,but still suffers from low selectivity and high overpotential at industrial current ***,lattice-distorted metallic nanosheets with disorder-engineered metal sites are designed for industrial-current-density CO_(2)-to-formate conversion at low *** a prototype,richly lattice-distorted bismuth nanosheets are first constructed,where abundant disorder-engineered Bi sites could be observed by high-angle annular dark-field scanning transmission electron microscopy ***-situ Fourier-transform infrared spectra reveal the CO_(2)•−*group is the key intermediate,while theoretical calculations suggest the electron-enriched Bi sites could effectively lower the CO_(2)activation energy barrier by stabilizing the CO_(2)•−*intermediate,further affirmed by the decreased formation energy from 0.49 to 0.39 *** a result,the richly lattice-distorted Bi nanosheets exhibit the ultrahigh current density of 800 mA·cm^(−2)with 91%Faradaic efficiencies for CO_(2)-to-formate electroreduction,and the formate selectivity can reach nearly 100%at the current density of 200 mA·cm^(−2)with a very low overpotential of ca.570 mV,outperforming most reported metal-based electrocatalysts.

关键词： CO_(2)-to-formate disorder-engineered metallic nanosheets industrial-current-density low overpotential

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High-Pressure Behavior of Copper Carbonate:Data from Malachite

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 615-617页

作者： liU Yingxin QIN Shan li Haijian li xiaodong li Yanchun liU Jing Key Laboratory of Orogenic Belts and Crustal Evolution of MOE Department of Geology Peking University Beijing 100871 China China Building Materials Academy Beijing 100024 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

In-situ high-pressure energy dispersive X-ray diffraction experiments of malachite have been performed using diamond anvil cell and synchrotron radiation. The highest recorded pressure is up to 17.4 GPa. The experimental results reveal that malachite experienced two phase transitions at 0.7 and 7.8 GPa, and the last one is reversible.

关键词： malachite high pressure phase transition synchrotron radiation X-ray diffraction

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Primary pancreatic gastrointestinal stromal tumor

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Hepatobiliary & Pancreatic Diseases International 2021年第4期20卷 391-393页

作者： Whayoung Lee xiaodong li Sonia Lee Vishal S Chandan Department of Pathology and Laboratory Medicine University of CaliforniaIrvineCA 92868USA Department of Radiological Sciences University of CaliforniaIrvineCA 92868USA

Gastrointestinal stromal tumor (GIST) arises from the interstitial cells of Cajal (ICC) and is the most common mesenchymal tumor of the gastrointestinal tract,accounting for approximately 1%-2%of all malignant gastroi... 详细信息

关键词： gastrointestinal stomach tumor

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Numerical Analysis of the Rotational Magnetic Springs for EDS Maglev Train

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CES Transactions on Electrical Machines and Systems 2022年第1期6卷 60-66页

作者： Gang Lv Yaqing liu Zhixuan Zhang xiaodong li IET Sch.of E.E. Beijing Jiaotong Univ.Beijing 100044China Macao University of Science and Technology Faculty of Innovation EngineeringMacao999078China

Different from the traditional railway trains,the combined levitation and guidance EDS maglev train is more likely to rotate after being ***,the rotational electromagnetic stiffnesses are significant operating parameters for the *** this paper,the different effects of each translational offset generated in the rotational motion on the corresponding rotational electromagnetic stiffnesses in the EDS maglev train are analyzed and ***,a three-dimensional model of the maglev train is ***,based on the space harmonic method and the equivalent circuit of the levitation and guidance circuits,the formulas of rolling,pitching and yawing stiffness are ***,by comparing with the three-dimensional finite element simulation results,the key translational displacements in the rotational motion which has a great impact on the stiffness are ***,the three-dimensional analytical formula can be simplified and the computation can be *** addition,the accuracy of the calculation results is verified by comparing with the experimental data of Yamanashi test line.

关键词： Magnetic spring EDS maglev train electrodynamic rotational motion rolling stiffness pitching stiffness yawing stiffness

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Spectrometric Study on the Interaction of Indocyanine Green with Human Serum Albumin

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Chemical Research in Chinese Universities 2016年第3期32卷 343-347页

作者： li xiaodong FU Yu MA lina WANG Zhenxin ZHANG Huimao Department of Radiology the First Hospital of Jilin University Changchun 130021 P. R. China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

The interaction of indocyanine green（ICG） with human serum albumin（HSA） was investigated via various spectrometric（UV-visible, fluorescence and circular dichroism） techniques. The experimental results indicate that the interaction of ICG with HSA depends on the values of R（R is defined as the molar ratio of HSA to ICG）. The interaction of 1CG with HSA can form two complexes with intrinsic binding constants（Ka） of 2.97×105（R≤2） and 2.63×104（R〉2）, respectively. The fluorescence and induced CD（ICD） spectra of ICG demonstrate that binding the first mole of HSA to ICG can form a chiral ICG-HSA complex with strong fluorescence emission, and the chirality and fluorescence of ICG-HSA complex can be significantly reduced by adding another mole of HSA to 1CG. Furthermore, although both ICG and ICG-HSA complexes followed an energy-dependent endocytosis process to enter living cells, the cellular uptaken dynamic mechanism of ICG was significantly affected by the HSA conjugation.

关键词： Indocyanine green(ICG) Human serum albumin(HSA) Spectrometric study Cellular uptaken

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Review of low-temperature plasma nitrogen fixation technology

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Waste Disposal and Sustainable Energy 2021年第3期3卷 201-217页

作者： Hang Chen Dingkun Yuan Angjian Wu Xiaoqing lin xiaodong li State Key Laboratory of Clean Energy Utilization Department of Energy EngineeringZhejiang UniversityHangzhou 310027China College of Metrology and Measurement Engineering China Jiliang UniversityHangzhou 310018China

Nitrogen fixation is essential for all forms of life,as nitrogen is required to biosynthesize fundamental building blocks of creatures,plants,and other life *** the main method of artificial nitrogen fixation,Haber–Bosch process(ammonia synthesis)has been supporting the agriculture and chemical industries since the ***,the disadvantages inherent to the Haber–Bosch process,such as high energy consumption and high emissions,cannot be ***,developing a green nitrogen fixation process has always been a research *** the various technologies,plasma-assisted nitrogen fixation technology is very promising due to its small scale,mild reaction conditions,and flexible *** the present work,the basic principles of plasma nitrogen fixation technology and its associated research progress are *** production efficiency of various plasmas is summarized and ***,the prospect of nitrogen fixation using low-temperature plasma in the future was proposed.

关键词： Plasma Ammonia synthesis Nitrogen oxides Plasma activated water

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Microstructure evolution of Al-Zn-Mg-Cu-Zr alloy during hot deformation

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Rare Metals 2010年第4期29卷 426-432页

作者： YAN liangming,SHEN Jian,li Zhoubing,li Junpeng,and YAN xiaodong General Research Institute for Nonferrous Metals,Beijing 100088,China General Research Institute for Nonferrous Metals Beijing China

Compression tests of the Al-Zn-Mg-Cu-Zr（7055） alloy were performed at various strains and temperatures from 300 to 450℃ under a con- stant strain rate between 10^-2 s^-1and 1 s^-1. Microstructures during hot deformation were studied by transmission electron microscopy （TEM）. Dislocation density, dislocation cells and subgrains of the deformed samples were investigated in detail and compared to make a better understanding of the microstructure evolution. The results showed that stress-strain curves under the experimental conditions belonged to the type of dynamic recovery. When the alloy deformed at various strains and 300℃, the microstructure underwent a process of disordered dislocations to cell structure, subgrain structure and subgrain coarsening. With the temperature increasing, subgrains grew and dislocation density in the interior decreased at a strain rate of 1 s^-1. At the temperature of 350℃, the average diameter of subgrains decreased, sub-boundaries broadened and dislocation density in the interior decreased when the strain rate was increased. The deformed samples of 7055 alloy had smaller subgrains than that of 7005 alloy at the same compression condition because of high alloy content.

关键词： aluminum alloy microstructure evolution dynamic recovery subgrain

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Broadband impedance spectrum detection of buffer layer defects in 110 kV crosslinked polyethylene cable with corrugated aluminium sheath

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High Voltage 2023年第5期8卷 967-976页

作者： Yanpeng Hao Peng Zhao Baojun Hui Yanting Cheng Wenbo Zhu Mingli Fu xiaodong li School of Electric Power Engineering South China University of TechnologyGuangzhouChina China Southern Power Grid Electric Power Research Institute Co.Ltd GuangzhouChina

The buffer layer defects of high‐voltage crosslinked polyethylene(XLPE)cable occur frequently,which makes the detection method become the focus to be ***,the broadband impedance detection technology for the buffer layer defects of high‐voltage XLPE cables with corrugated aluminium sheath is *** are nine cable samples,including new and defective *** of the defective cables are artificial,and the other is retired *** influence of wiring mode,the circumferential relative position of electrodes,cable length,artificial white powder,artificial damp,and retired defective cables on the impedance spectrum is *** is found that the wiring mode of the insulation shield/aluminium sheath at the end of the cable can effectively detect the buffer layer *** the broadband impedance amplitude spectrum of the buffer layer in defective cable,measuring at various circumferential relative positions,is obviously *** there are white powders,air gaps,or ablation in the buffer layer,the broadband impedance spectrum(BIS)will increase by several *** the buffer layer is damped,the BIS will *** research here provides theoretical support and technical methods for the buffer layer defects of XLPE cable with corrugated aluminium sheath.

关键词： impedance spectrum layer

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