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Journal of Forestry Research 2016年第3期27卷 551-556页

作者： Yunjie Wu fengyou wang Sixi Zhu Northeast Forestry University Harbin 150040 China Guizhou Minzu University Guiyang 550025 China

We selected four kinds of land use types from Caohai wetlands of Guizhou plateau（a total number of 32 soil profiles） to study the distribution characteristics of organic carbon content in soil. With different ways of land use, the organic carbon content of soil profiles and organic carbon density show the tendency of decreasing firstly and then increasing from top to bottom. With the increase of depth, the vertical difference becomes smaller first and then starts increasing. Land reclamation reduces the soil organic carbon content and density, changing its distribution structure in topsoil. The average content of organic carbon in Caohai wetlands are as follows： lake bed silt [ marsh wetland [ farmland [ woodland, the average organic carbon content of lake bed silt, marsh wetland,farmland and woodland are 16.40, 2.94, 1.81 and 1.08 %,respectively. Land reclamation reduces the organic carbon content of soil, therefore the conversion of cultivated lands to wetlands and the increase of forest coverage will help to fix the organic carbon in soil and increase its reserves.

关键词： Land using pattern Wetlands Soil organiccarbon Soil bulk density

Moisture-preventing MAPbI_(3) solar cells with high photovoltaic performance via multiple ligand engineering

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Nano Research 2022年第2期15卷 1375-1382页

作者： Xin Li Jinyue Du Hui Duan Haoyan wang Lin Fan Yunfei Sun Yingrui Sui Jinghai Yang fengyou wang Lili Yang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China National Demonstration Center for Experimental Physics Education Jilin Normal UniversitySiping 136000China Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of EducationJilin Normal UniversityChangchun 130103China

Perovskite solar cells present one of the most prominent photovoltaic technologies,yet their stability,and engineering at the molecular level remain *** have demonstrated multifunctional molecules to improve the operating stability of perovskite solar cells while depicting a high-power conversion *** multifunctional molecule 4-[(trifluoromethyl)sulphanyl]-aniline(4TA)with trifluoromethyl(-CF_(3))and aniline(-NH_(2))moieties is meticulously designed to modulate the ***-CF_(3) and-NH_(2) functional groups have strong interaction with perovskite to suppress surface defects to improve device stability,as well as obtain large crystal grains through delaying ***,this-CF_(3) forms a hydrophobic barrier on the surface of the perovskite to prevent cell ***,the performance of the perovskite solar cells is remarkably improved with the efficiency increased from 18.00% to 20.24%.The perovskite solar cells with multifunctional molecular maintaining 93% of their original efficiency for over 30 days(-55%humidity)in air without device encapsulation,exhibiting a high long-term ***,the lead leakage issue of perovskite solar cells has also been suppressed by the built-in 4TA molecule,which is beneficial to environment-friendly ***,we believe this multifunctional small molecule provides an available way to achieve high performance perovskite solar cells and the related design strategy is helpful to further develop more versatile materials for perovskite-based optoelectronic devices.

关键词： stability high-power conversion efficiency perovskite solar cells hydrophobic barrier

ARTIFICIAL REGENERATION OF KOREAN SPRUCE IN NORTHEAST CHINA

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Journal of Northeast Forestry University 1990年第1期1卷 11-15页

作者： Zhan Hongzhcn (1) Zhang Tongwei (1) wang fengyou (1) 1. Northeast Forestry University 150040 Harbin P. R. China

Korean spruce(Picea koraiensis Nakai)has been included as a Chinese regenerationspecies since the 1960’*** the 1970’s it became one of the four most important species in thenortheast forest region of China. Korean spruce is a timber species with a wide range of adaptation,high survival rate,and few diseases or *** of 30—year trials show that the regeneration ofkorean spruce is successful and has a prospective future.

关键词： Korcan spruce Forest regencration conifer regencration

Full-scale chemical and field-effect passivation:21.52% efficiency of stable MAPbI_(3) solar cells via benzenamine modification

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Nano Research 2021年第8期14卷 2783-2789页

作者： fengyou wang Meifang Yang Yuhong Zhang Jinyue Du Shuo Yang Lili Yang Lin Fan Yingrui Sui Yunfei Sun Jinghai Yang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China National Demonstration Center for Experimental Physics Education Jilin Normal UniversitySiping 136000China Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of EducationJilin Normal UniversityChangchun 130103China College of Science Changchun UniversityChangchun 130022China

Organic-inorganic metal halide perovskite solar cells have achieved high efficiency of 25.5%.Finding an effective means to suppress the formation of traps and correlate stability losses are thought to be a promising route for further increasing the photovoltaic performance and commercialization potential of perovskite photovoltaic ***,we report a facile passivation model,which uses a multi-functional organic molecule to simultaneously realize the chemical passivation and field-effect passivation for the perovskite film by an upgraded anti-solvent coating method,which reduces the trap states density of the perovskite,improves interface charge transfer,and thus promotes device *** addition,the hydrophobic groups of the molecules can form a moisture-repelling barrier on the perovskite grains,which apparently promotes the humidity stability of the solar ***,the optimal power conversion efficiency(PCE)of perovskite solar cells after synergistic passivation reaches 21.52%,and it can still retain 95%of the original PCE when stored in-40%humidity for 30 *** findings extend the scope for traps passivation to further promote both the photovoltaic performance and the stability of the perovskite solar cells.

关键词： chemical passivation anti-solvent MAPbI_(3)solar cells recombination charge transfer

Upgraded antisolvent engineering enables 2D@3D quasi core-shell perovskite for achieving stable and 21.6%efficiency solar cells

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Journal of Materials Science & Technology 2021年第33期92卷 21-30页

作者： fengyou wang Jinyue Du Yuhong Zhang Meifang Yang Donglai Han Lili Yang Lin Fan Yingrui Sui Yunfei Sun Jinghai Yang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China National Demonstration Center for Experimental Physics Education Jilin Normal UniversitySiping 136000China Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of EducationJilin Normal UniversityChangchun 130103China School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China

Perovskite solar cells(PSCs)have become a promising alternative to sustainable energy due to their high power conversion efficiency(PCE)and low-cost ***,the practical applications of PSCs are still limited by the trade-off between high performance and poor stability under ***,a2D@3D perovskite with quasi core-shell architecture linking the superiorities of both two-dimensional(2D)and three-dimensional(3D)perovskite is prepared through a novel upgraded antisolvent *** basic properties as well as the phase distribution and the charge transport behavior of the 2D@3D perovskite were systematically elucidated.A high PCE of 21.60%for 2D@3D PSCs is achieved due to the enhanced surface and grain boundaries passivation,improved energy level alignment and efficient holes *** 2D@3D perovskite device without encapsulation shows significantly improved stability at the room temperature(90%of initial PCE for 45 d with a relative humidity of 50%±5%)and relative thermal conditions(83%of initial PCE for 200 h under 85℃).Compared with traditional 3D PSCs,it proved that such 2D@3D perovskite configuration is an effective architecture for enhancing efficiency and improving stability and therefore will facilitate the further industrialization of PSCs.

关键词： Low-cost processing Surface and grain boundaries Two-dimensional materials Efficiency Stability

Landscape Structure Changes in Liangshui Nature Reserve, Northeast China

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Forestry Studies in China 2003年第4期5卷 31-36页

作者： Niu Jianzhi Gao Jiarong wang fengyou College of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083P.R.China Heilongjiang Forestry Department Harbin 150000P.R.China

This paper systematically studied the landscape dynamic changes in Liangshui Natural Reserve (LNR) in Heilongjiang Province, northeast China during three periods (1950s, 1970s and 1990s), by applying landscape space model------Markov model. The results indicated that the landscape structure in LNR changed and the types of landscape patches increased. The phenomena of increasing and reducing of landscape types happened at the same time and the matrix— natural Pinus koraiensis decreased year by year. The law of transformation of landscape types matches well with the results concluded from statistical data, survey data, and the developing process inherent succession of the forest. By analyzing landscape dynamic changes, some scientific management measures were put forward in this paper.

关键词： landscape dynamics scale Markov model

Perovskite/silicon-based heterojunction tandem solar cells with 14.8%conversion efficiency via adopting ultrathin Au contact

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Journal of Semiconductors 2017年第1期38卷 60-65页

作者： Lin Fan fengyou wang Junhui Liang Xin Yao Jia Fang Dekun Zhang Changchun Wei Ying Zhao Xiaodan Zhang Institute of Photo-Electronic Thin Film Devices and Technology of Nankai University Key Laboratory of Photo-Electronic Thin Film Devices and TechnologyTianjin 300071China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

A rising candidate for upgrading the performance of an established narrow-bandgap solar technology without adding much cost is to construct the tandem solar cells from a crystalline silicon bottom cell and a high open-circuit voltage top ***,we present a four-terminal tandem solar cell architecture consisting of a selffiltered planar architecture perovskite top cell and a silicon heterojunction bottom cell.A transparent ultrathin gold electrode has been used in perovskite solar cells to achieve a semi-transparent *** transparent ultrathin gold contact could provide a better electrical conductivity and optical reflectance-scattering to maintain the performance of the top cell compared with the traditional metal oxide *** four-terminal tandem solar cell yields an efficiency of 14.8%,with contributions of the top（8.98%）and the bottom cell（5.82%）,*** also point out that in terms of optical losses,the intermediate contact of self-filtered tandem architecture is the uppermost problem,which has been addressed in this communication,and the results show that reducing the parasitic light absorption and improving the long wavelength range transmittance without scarifying the electrical properties of the intermediate hole contact layer are the key issues towards further improving the efficiency of this architecture device.

关键词： lanar perovskite top cell silicon heterojunction bottom cell four-terminal tandem transparent ultra-thin gold electrode

Settlement Area of Cr Content Decided by Source and Topographic Features

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Meteorological and Environmental Research 2017年第6期8卷 70-71,77页

作者： Yang Dongfang Zhu Sixi wang Zhikang Yang Xiuqin wang fengyou Karst Wetland Ecology Research Center Guizhou Minzu UniversityGuiyang 550025China School of Chemistry and Environmental Sciences Guizhou Minzu UniversityGuiyang 550025China North China Sea Environmental Monitoring Center State Oceanic AdministrationQingdao 266033China

Based on the investigation data of Jiaozhou Bay waters in 1981,change range,horizontal distribution and vertical change of Cr content in surface and bottom waters of Jiaozhou Bay were studied. The results showed that at change scale,Cr contents from surface and bottom layers had same change range in Jiaozhou Bay waters of August; at space scale,Cr contents from surface and bottom layers had converse change trend;at vertical scale,Cr contents from surface and bottom layers had similar change. At regional scale,Cr content from surface layer was more than that from bottom layer in Jiaozhou Bay waters except stations A3 and A6; at stations A6 and A3,Cr content from surface layer was less than that from bottom layer. It illustrated that high settlement area of bottom Cr content was in estuary of Haibo River and sunken waters of bay ***,the source and special topographic features decided high settlement area of Cr content in Jiaozhou Bay waters.

关键词： Cr content Vertical change Topographic features High settlement area Jiaozhou Bay

The Impact of Regional Rainfall on Runoff of Yachi River of Guizhou

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Meteorological and Environmental Research 2017年第1期8卷 7-13页

作者： Yang Dongfang wang fengyou wang Lin Zhang Rong Zhu Sixi Karst Wetland Ecology Research Center Guizhou Nationalities University Guiyang 550025 China School of Chemistry and Environmental Sciences Guizhou Nationalities University Guiyang 550025 China Guizhou East Century Science and Technology Limited Company Guiyang 550002 China

Based on monthly runoff data of Yachi River of Guizhou from April 2014 to May 2015,and monthly rainfall data of Guiyang,Xichang,Wenjiang and Chongqing weather stations from January 2007 to November 2015,the influence of temporal-spatial component of regional rainfall on monthly runoff of Yachi River was analyzed by using REOF,multiple linear regression analysis and harmonic ***-spatial change of monthly rainfall around Yachi River mainly contained four kinds of *** first mode was northwest-southeast type,and the second mode was south-north type,and the third mode was east-west *** components of the three modes were all quasi equilibrium seasonal and interannual *** them,the first and second modes had stable seasonal change,while seasonal change of the third mode was the most unstable,and drought-flood situation of season variation was easy to *** change form of monthly runoff in Yachi River was obviously different from regional monthly rainfall,and it was mainly affected by underlying surface topography and human activity(reservoir and hydropower station),and could not make a natural response to seasonal change of rainfall in *** third mode of regional monthly rainfall and cycle fitting amount of had insignificant impact on monthly runoff of Yachi River,while the first mode of regional monthly rainfall and cycle fitting amount showed significantly positive correlation with monthly runoff of Yachi *** second mode of regional monthly rainfall and cycle fitting amount had significantly negative correlation with monthly runoff of Yachi River,and Yachi River had significant water-storage regulation effect on the mode *** River did not have water-storage regulation effect on flood component of seasonal variation of regional monthly rainfall.

关键词： Yachi River Runoff REOF analysis Rainfall China

Persistence of Organic Pesticide HCH in Waters

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Meteorological and Environmental Research 2014年第3期5卷 42-45页

作者： Yang Dongfang Zhu Sixi wang fengyou wang Yi Yang Xiuqin Research Center for Karst Wetland Ecology Guizhou Minzu University College of Chemistry and Environmental Science Guizhou Minzu University North China Sea Environmental Monitoring Center State Oceanic Administration

[Objective]The research aimed to study HCH persistence in Jiaozhou Bay.[Method]Based on the investigation data in Jiaozhou Bay in April,August,September and October of 1989,we analyzed the source,distribution and migration status of HCH in sea area of Jiaozhou *** using structural model of HCH environmental background value in Jiaozhou Bay,basic background value,input amount of terrestrial runoff and environmental background value of HCH in Jiaozhou Bay were calculated.[Result]Basic background value of HCH in water area of Jiaozhou Bay was 0.012 7μg/L,HCH input amount of terrestrial runoff was during 0-0.057 1μg/L,HCH content input by ocean current was 0μg/***,environmental background value of HCH in water area of Jiaozhou Bay was during 0.012 7-0.069 8μg/L.[Conclusion]HCH needed long time migrating from land to sea bottom,and experienced terrestrial migration process,water migration process,settlement process and biological migration cycle *** these migration processes,HCH was persistent,and always caused threats and harms on organism.

关键词： HCH Persistence Environmental background value Biological migration cycle Jiaozhou Bay China