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A learning framework based on weighted knowledge transfer for holiday load forecasting

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 329-339页

作者： Pan ZENG chang sheng Min JIN College of Computer Science and Electronic Engineering Hunan University

Since the variation pattern of load during holidays is different than that of non-holidays, forecasting holiday load is a challenging task. With a focus on this problem, we propose a learning framework based on weighted knowledge transfer for daily peak load forecasting during ***,we select source cities which can provide extra hidden knowledge to improve the forecast accuracy of the load of the target city. Then, all the instances which are from source cities and the target city will be weighted and trained by the improved weighted transfer learning algorithm which is based on the TrAdaBoost algorithm and can decrease negative transfer. We evaluate our method with the classical support vector machine method and a method based on knowledge transfer on a real data set, which includes eleven cities in Guangdong province of China,to illustrate the performance of the method. To solve the problem of limited historical holiday load data, we transfer the data from nearby cities based on the fact that nearby cities in Guangdong province of China have a similar economic development level and similar load variation pattern. The results of comparative experiments show that the framework proposed by this paper outperforms these methods in terms of mean absolute percent error and mean absolute scaled error.

关键词： Load forecasting Holiday effect Sparse data Weighted knowledge transfer

Synthesis and Characterization of Zirconia Nanocrystallites by Cationic Surfactant and Anionic Surfactant

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Chinese Journal of Structural Chemistry 2005年第10期24卷 1133-1139页

作者： YU Jian-chang HU sheng-Wei College of Material Science and Engineering Fuzhou University Fuzhou 350002 China

Study on nanomaterials has attracted great interests in recent years. In this article, zirconia nanocrystallites of different structures have been successfully synthesized via hydrothermal methods with cationic surfactant （CTAB） and anionic surfactant （SDS）, respectively. Differential Scanning Calorimeter （DSC-TG）, X-ray Diffractometer （XRD）, Transmission Electron Microscope （TEM）, Ultraviolet-Visible （UV-vis） and N2 adsorption-desorption analyses are used for their structure characteristics. The results show that the cationic surfactant has a distinctive direction effect on the formation of zirconia nanocrystallites, while the anionic surfactant has a self-assembly synergistic effect on them. The sample synthesized with the cationic surfactant presents good dispersion with the main phase of tetragonal zirconia, and the average nanocrystal size is around 15 nm after calcination at 500 ℃. While the sample synthesized with the anionic surfactant exhibits a worm-like mesoporous structure with pure tetragonal phase after calcination at 500 ℃ and with good thermal stability.

关键词： cationic surfactant anionic surfactant zirconia nanocrystallites,mesoporous zirconia

Modeling for critical state line of granular soil with evolution of grain size distribution due to particle breakage

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Geoscience Frontiers 2020年第2期11卷 473-486页

作者： Ching S.chang Yibing deng Department of Civil and Environmental Engineering University of Massachusetts

Determination of the critical state line(CSL)is important to characterize engineering properties of granular *** size distribution(GSD)has a significant influence on the location of *** influence of particle breakage on the CSL is mainly attributed to the change in GSD due to particle ***,GSD has not been properly considered in modeling the CSL with influence of particle *** study aims to propose a quantitative model to determine the CSL considering the effect of *** hypothesize that the change of critical state void ratio with respect to GSD is caused by the same mechanism that influences of the change of minimum void ratio with respect to ***,the particle packing model for minimum void ratio proposed by chang et al.(2017)is extended to predict critical state void *** developed model is validated by experimental results of CSLs for several types of granular *** the evolution of GSD due to particle breakage is incorporated into the *** model is further evaluated using the experimental results on rockfill material,which illustrates the applicability of the model in predicting CSL for granular material with particle breakage.

关键词： Critical state void ratio Particle breakage Grain size distribution Particle packing model Granular material

Differential expressions among five Waxy alleles and their effects on the eating and cooking qualities in specialty rice cultivars

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Journal of Integrative Agriculture 2015年第6期14卷 1153-1162页

作者： ZHOU Li-jie sheng Wen-tao WU Jun ZHANG chang-quan LIU Qiao-quan deng Qi-yun Longping Branch of Graduate School Central South University State Key Laboratory of Hybrid Rice Hunan Hybrid Rice Research Center Key Laboratories of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Plant Functional Genomics Ministry of Education/Agricultural College Yangzhou University

Eating and cooking qualities（ECQs） of rice are important attributes due to its major influence on consumer acceptability. To better understand the molecular mechanism of the variation in ECQs, we investigated and compared the expressions among different alleles of the Waxy（Wx） gene and its effect on ECQs in specialty rice cultivars. The results showed that the accumulation of amylose was positively and significantly correlated to the level of mature Wx m RNA and granule-bound starch synthase I（GBSS I） in developing rice grain at 12 days after flowering. The amount of GBSS I and its activity together are the main factors controlling amylose synthesis. Differences in ECQs among five Wx allele types were investigated in samples from 15 rice varieties. The apparent amylose content（AAC） and gel consistency（GC） were similar in each type of Wx allele. The AAC followed the order, Wx^a type〉Wx^in type〉Wx^b type〉Wx^mq type〉wx. Contrary to this, the GC showed an opposite trend compared to AAC. There was a wide variation in rapid visco analyzer（RVA） profile among five Wx allele types, while varieties sharing a specified Wx allele had basically the similar RVA profile, although there was a slight difference in some RVA parameters, peak, hot paste and cool paste viscosities.

关键词： alleles cooking eating qualities GBSS starch specialty flowering mature paste

One-pot Approach to the Conversion of Alcohols into α-Halo-α, β-unsaturated Esters

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Chinese Chemical Letters 2006年第3期17卷 329-332页

作者： Gui sheng deng Chun Yu LIU College of Chemistry and Chemical Engineering Hunan Normal University Changsha 410081

The sequential oxidation-Horner-Wadsworth-Emmons reaction of alcohols to prepare α-Halo-α,β-unsaturated esters （halo =F, Cl） with middle to excellent （Z）-selectivity was developed.

关键词： Horner-Wadsworth-Emmons reaction,α-Halo-α,β--unsaturated esters alcohol one-pot approach synthesis.

Highly-active,metal-free,carbon-based ORR cathode for efficient organics removal and electricity generation in a PFC system

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Chinese Chemical Letters 2021年第7期32卷 2212-2216页

作者： Qingyi Zeng sheng chang Mingqi Wang Mi Li Qin wen deng Zhu Xiong Baoxue Zhou Yanbiao Liu School of Resources&Environment and Safety Engineering University of South ChinaHengyang 421001China Institute of Environmental Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection College of Environmental Science and EngineeringDonghua UniversityShanghai 201620China

A highly-active,metal-free,carbon-based oxygen reduction reaction(ORR)cathode,i.e.,graphitized Ndoped carbon felt(GNCF),was prepared,for the first time,by in-situ modifying the doping species of polyacrylonitrile(PAN)-based carbon felt(CF)via a facile annealing process in Ar *** was applied for dramatically enhanced organics degradation and electricity generation in a photocatalytic fuel cell(PFC)*** GNCF showed enhanced specific surface area,improved graphitization and raised ratio of graphitic N,therefore resulting in excellently improved ORR performance compared to the *** applying the GNCF as a cathode in a PFC system,the proposed PFC showed significant improvement in degrading various model organic contaminants and outputing electricity simultaneously when compared with the PFC with *** instance,the apparent rate constant and electricity output efficiency showed~10.6 times and~7.2 times,respectively,improvement when using rhodamine B as model *** improved performance was also achieved by aeration of air or O^(2) due to the fu rther enhanced *** proposed PFC was also efficient in a wide pH,and kept outsta nding stability in long-term utilization.

关键词： Photocatalytic fuel cell Oxygen reduction reaction Electricity Graphitization N-doping

Preparation and performance of a cold gas dynamic sprayed high-aluminum bronze coating

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International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1354-1361页

作者： Li Feng chang Guan Ji-rong chang Hai-min Zhai Guo-sheng An Wen-sheng Li School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou 730050China

By mixing preheated high-aluminum bronze powders with different amounts of Al_2O_3 powder, a low-pressure cold-sprayed coating was prepared and sprayed onto a Cr12MoV steel substrate. The hardness of the coating and the bonding strength between the coating and the substrate were tested with a HV-1000 microhardness tester and a mechanical universal testing machine. The surface microstructure, cross-section and tensile fracture surface of the coating were observed with a scanning electron microscope(SEM). Correspondingly, the influences of the preheat treatment temperature of the bronze powder and the Al_2O_3 content on the coating performance were investigated. The results indicate that the hardness of bronze powders decreased and the coating deposition rate increased after the preheating treatment of the bronze powder. The Al_2O_3 content in the mixed powders contributed to the deformation of bronze powders during the spraying process. This trend resulted in varied performance of the coating.

关键词： low-pressure cold spray high-aluminum bronze preheat treatment coating performance

Silver(I)-mediated reaction of trimethylsilylated arylacetylenes with sulfonyl chlorides:Unexpected formation of vinvl sulfones

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Chinese Chemical Letters 2012年第10期23卷 1115-1118页

作者： Gui sheng deng Teng Fei Sun College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081China Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Hunan Normal University) Ministry of EducationChangsha 410081China

A novel reaction of trimethylsilylated arylacetylenes with sulfonyl chlorides was performed in the presence of silver nitrate or triflate. Conjugated vinyl sulfones as dramatic products were obtained in moderate yield... 详细信息

关键词： Alkynyl trirnethylsilane Sulfonyl chlorides Vinyl sulfones Silver nitrate

InCl_3·4H_2O Catalyzed Aldol Condensation of Cycloalkanones with Aromatic Aldehydes

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Chinese Chemical Letters 2001年第10期12卷 859-860页

作者： Gui sheng deng Tie Gang REN College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081

InCl34H2O catalyzes the cross-aldol condensation of cycloalkanones with aromatic aldehydes in sealed tube under solvent free condition to afford an efficient method for the synthesis of a, a-bis(substituted)benzyliden... 详细信息

关键词： Aldol condensation cycloalkanone indium trichloride catalysis.