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Effect of coir geotextile and geocell on ephemeral gully erosion in the Mollisol region of Northeast China

Journal of Arid Land 2024年第4期16卷 518-530页

作者： QIN Xijin SUN Yiqiu ZHANG Yan guan Yinghui wu Hailong wang Xinyu wang guangyu School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China Tianjin Eco-Environmental Protection Design&Research Institute Tianjin 300042China College of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Faculty of Forestry University of British Columbia2424 Main MallVancouver BC V6T 1Z4Canada

The unique geomorphological features and farming methods in the Mollisol region of Northeast China increase water catchment flow and aggravate the erosion of ephemeral gully(EG).Vegetation suffers from rain erosion and damage during the growth stage,which brings serious problems to the restoration of grass in the early ***,effects of coir geotextile and geocell on EG erosion under four confluence intensities were researched in this *** of the simulated water discharge erosion test showed that when the confluence strength was less than 30 L/min,geocell and coir geotextile had a good effect on controlling EG erosion,and sediment yield of geocell and coir geotextile was reduced by 25.95%–37.82%and 73.73%–88.96%,***,when confluence intensity increased to 40 L/min,protective effect of coir geotextile decreased,and sediment yield rate increased sharply by 189.03%.When confluence intensity increased to 50 L/min,the protective effect of coir geotextile was *** the other hand,geocell showed that the greater the flow rate,the better the protective *** addition,with the increase in confluence intensity,erosion pattern of coir geotextile developed from sheet erosion to intermittent fall and then to completion of main rill,and the protective effect was gradually *** contrast,the protective effect of EG under geocell was gradually enhanced from the continuous rill to the intermittent rill and finally to the intermittent *** study shows that coir geotextile and geocell can prevent EG erosion,and the effect of geocell is better than that of coir geotextile on the surface of EG.

关键词： geocell coir geotextile ephemeral gully confluence intensity erosion control

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Pt confined in Sn-ECNU-46 zeolite for efficient alkane dehydrogenation

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Chinese Journal of Structural Chemistry 2024年第4期43卷 15-23页

作者： Naihong wang Longkang Zhang Yejun guan Peng wu Hao Xu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal UniversityShanghai200062China State Key Laboratory of Petroleum Molecular&Process Engineering SKLPMPE Sinopec Research Institute of Petroleum Processing Co.LTD.Beijing100083China East China Normal University Shanghai200062China

Highly dispersed and stable Pt-based catalysts play a crucial role in constructing efficient catalytic systems for alkane *** this study,a novel bimetallic Pt-Sn catalyst confined in extra-large-pore ECNU-46 zeolite(denoted as Pt/Sn-ECNU-46)is prepared by *** open-site framework Sn species((SiO)_(3)Sn-OH)serve as anchors to interact with Pt species,favoring the high dispersion of *** the other hand,the framework Sn species act as the second metal to regulate the geometrical and electronic environment of Pt species,thus suppressing their ***/Sn-ECNU-46 achieves a good performance in propane dehy-drogenation(PDH)reaction with high initial propane conversion(46%)and propylene selectivity(>99%)as well as regeneration *** addition,Pt/Sn-ECNU-46 is also active in the dehydrogenation of *** study explores the application of extra-large-pore zeolite as support in constructing metal-confined catalysts for alkane dehydrogenation.

关键词： Alkane dehydrogenation Heteroatom-containing zeolite Zeolite confined catalyst Pt-based catalyst

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Successively Regioselective Electrosynthesis and Electron Transport Property of Stable Multiply Functionalized[60]Fullerene Derivatives

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Research 2020年第1期2020卷 283-291页

作者： Xing-Xing Yan Bairu Li Hao-Sheng Lin Fei Jin Chuang Niu Kai-Qing Liu guan-wu wang Shangfeng Yang Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Soft Matter ChemistryCenter for Excellence in Molecular Synthesis of CASand Department of ChemistryUniversity of Science and Technology of ChinaHefeiAnhui 230026China Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy Conversionand Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefeiAnhui 230026China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhouGansu 730000China

With the recent advance in chemical modification of fullerenes,electrosynthesis has demonstrated increasing importance in regioselective synthesis of novel fullerene ***,we report successively regioselective synthesis of stable tetra-and hexafunctionalized[60]fullerene *** cycloaddition reaction of the electrochemically generated dianions from[60]fulleroindolines with phthaloyl chloride regioselectively affords 1,2,4,17-functionalized[60]fullerene derivatives with two attached ketone groups and a unique addition pattern,where the heterocycle is rearranged to a[5,6]-junction and the carbocycle is fused to an adjacent[6,6]-*** addition pattern is in sharp contrast with that of the previously reported biscycloadducts,where both cycles are appended to[6,6]-*** obtained tetrafunctionalized compounds can be successively manipulated to 1,2,3,4,9,10-functionalized[60]fullerene derivatives with an intriguing“S”-shaped configuration via a novel electrochemical ***,the stability of tetrafunctionalized[60]fullerene products allows them to be applied in planar perovskite solar cells as efficient electron transport layers.

关键词： synthesis successively addition

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Research on Leading Edge Erosion and Aerodynamic Characteristics of Wind Turbine Blade Airfoil

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Fluid Dynamics & Materials Processing 2024年第9期20卷 2045-2058页

作者： Xin guan Yuqi Xie Shuaijie wang Mingyang Li Shiwei wu School of New Energy Shenyang Institute of EngineeringShenyang110136China

The effects of the erosion present on the leading edge of a wind turbine airfoil(DU 96-W-180)on its aerodynamic performances have been investigated numerically in the framework of a SST k–ωturbulence model based on the Reynolds Averaged Navier-Stokes equations(RANS).The results indicate that when sand-induced holes and small pits are involved as leading edge wear features,they have a minimal influence on the lift and drag coefficients of the ***,if delamination occurs in the same airfoil region,it significantly impacts the lift and resistance characteristics of the ***,as the angle of attack grows,there is a significant decrease in the lift coefficient accompanied by a sharp increase in the drag *** wear intensifies,these effects gradually ***,the leading edge wear can exacerbate flow separation near the trailing edge suction surface of the airfoil and cause forward displacement of the separation point.

关键词： Wind energy wind turbine erosion airfoil leading edge erosion characteristics aerodynamic performance numerical simulation

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Examination of two-phase behaviors in porous media during pool boiling

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Science China(Technological Sciences) 2024年第6期67卷 1695-1713页

作者： ZHANG ZhiHao guan ShuYa wu Rui ZHAO ChangYing School of Mechanical Engineering Shanghai Jiao Tong University

The enhancement of pool boiling heat transfer using porous media has been extensively *** the two-phase distribution and evolution in porous media are crucial to the heat transfer performance,including the critical heat flux(CHF)and heat transfer coefficient(HTC),direct observation of the two-phase flow inside the media is limited owing to the blockage of the direct view from the porous *** this study,pool boiling visualization experiments were conducted on porous samples with different throat widths in deionized *** results showed that the HTC increased with the throat ***,the growth-contraction cycle of the vapor region and the formation and drying of the wall liquid film inside the porous media were *** vapor region,including the maximum and minimum areas in the boiling cycle,was quantitatively ***,the relationship between the minimum gas-phase area and HTC peak was identified.A one-dimensional transient model was developed considering solid skeleton heat conduction,liquid film evaporation,and vapor region growth to quantitatively study the influence of heat flux on the internal two-phase *** model successfully captured the maximum gas-phase area,duration of boiling cycles,and HTC trends at specific heat *** results of this quantitative study provide insights into the internal two-phase distribution and evolution induced by pool boiling.

关键词： porous media two-phase behaviors pool boiling

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Microbiome-driven anticancer therapy:A step forward from natural products

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mLife 2024年第2期3卷 219-230页

作者： Yunxuan guan Di wu Hui wang Ning-Ning Liu State Key Laboratory of Systems Medicine for Cancer Center for Single‐Cell OmicsSchool of Public HealthShanghai Jiao Tong University School of MedicineShanghaiChina

Human microbiomes,considered as a new emerging and enabling cancer hallmark,are increasingly recognized as critical effectors in cancer development and *** of microbiome revitalizing anticancer therapy from natural products shows promise toward improving cancer ***,we summarize our current understanding of the human microbiome‐driven molecular mechanisms impacting cancer progression and anticancer *** highlight the potential translational and clinical implications of natural products for cancer prevention and treatment by developing targeted therapeutic strategies as adjuvants for chemotherapy and immunotherapy against *** challenges and opportunities for future investigations using modulation of the microbiome for cancer treatment are further discussed in this review.

关键词： anticancer cancer chemotherapy immunotherapy microbiota

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Banana-shaped electron acceptors with an electron-rich core fragment and 3D packing capability

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Carbon Energy 2023年第1期5卷 123-133页

作者： Pengqi Li Xianyi Meng Ke Jin Zhiwei Xu Jianqi Zhang Lixiu Zhang Chuang Niu Furui Tan Chenyi Yi Zuo Xiao Yaqing Feng guan-wu wang Liming Ding School of Chemical Engineering and Technology Tianjin UniversityTianjinChina Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS) Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Chemistry University of Science and Technology of ChinaHefeiChina Key Laboratory of Photovoltaic Materials Henan UniversityKaifengChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

The emergence of Y6-type nonfullerene acceptors has greatly enhanced the power conversion efficiency(PCE)of organic solar cells(OSCs).However,which structural feature is responsible for the excellent photovoltaic performance is still under *** this study,two Y6-like acceptors BDOTP-1 and BDOTP-2 were *** from previous Y6-type acceptors featuring an A–D–Aʹ–D–A structure,BDOTP-1,and BDOTP-2 have no electron-deficient Aʹfragment in the core ***,there is an electron-rich dibenzodioxine fragment in the *** this modification leads to a marked change in the molecular dipole moment,electrostatic potential,frontier orbitals,and energy levels,BDOTP acceptors retain similar three-dimensional packing capability as Y6-type acceptors due to the similar banana-shaped molecular *** acceptors show good performance in *** PCEs of up to 18.51%(certified 17.9%)are *** study suggests that the banana-shaped configuration instead of the A–D–Aʹ–D–A structure is likely to be the determining factor in realizing high photovoltaic performance.

关键词： 3D packing capability core fragment molecular configuration nonfullerene acceptors organic solar cells

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Flotation separation of scheelite from calcite using luteolin as a novel depressant

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 462-472页

作者： Xiaokang Li Ying Zhang Haiyang He Yu wu Danyu wu Zhenhao guan Faculty of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Clean Utilization of Complex Non-Ferrous Metal Resources Kunming University of Science and TechnologyKunming 650093China

This paper proposes luteolin(LUT)as a novel depressant for the flotation-based separation of scheelite and calcite in a sodium oleate(NaOL)*** suitability of LUT as a calcite depressant is confirmed through micro-flotation *** pH=9,with LUT concentration of 50 mg·L^(-1) and NaOL concentration of 50 mg·L^(-1),scheelite recovery reaches 80.3%.Calcite,on the other hand,exhibits a recovery rate of 17.6%,indicating a significant difference in floatability between the two ***,the surface modifica-tions of scheelite and calcite following LUT treatment are characterized using adsorption capacity testing,Zeta potential analysis,Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and atomic force microscopy(AFM).The study in-vestigates the selective depressant mechanism of LUT on *** capacity testing and Zeta potential analysis demonstrate sub-stantial absorption of LUT on the surface of calcite,impeding the further adsorption of sodium oleate,while its impact on scheelite is ***-IR and XPS analyses reveal the selective adsorption of LUT onto the surface of calcite,forming strong chemisorption bonds between the hydroxyl group and calcium ions *** directly illustrates the distinct adsorption densities of LUT on the two miner-al ***,LUT can effectively serve as a depressant for calcite,enabling the successful separation of scheelite and calcite.

关键词： scheelite calcite luteolin flotation depressant separation

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Reactions of Dianionic [60]-Fused Heterocycles with Electrophiles

Reactions of Dianionic [60]-Fused Heterocycles with Electrop...

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中国化学会·第十三届全国物理有机化学学术会议

作者： guan-wu wang Department of Chemistry University of Science and Technology of China

Fullerenes and their derivatives are electron-deficient molecules,and therefore they are *** they are reduced by controlled potential electrolysis (CPE) and thus would undergo a umpolung process,the formed negatively charged fullerenes and fullerene derivatives are nucleophiles.I will present our recent progress in the electrochemical reactions of [60]fullerene (C)-fused heterocycles.

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Electrochemical Reactions Based on [60]Fullerene Derivatives

Electrochemical Reactions Based on [60]Fullerene Derivatives

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中国化学会第十四届全国有机合成化学学术研讨会

作者： guan-wu wang School of Chemistry and Materials Science University of Science and Technology of China

Electrochemical organic reactions have attracted increasing attentions of organic chemists. Fullerenes and their derivatives are electron-deficient molecules, and therefore they are electrophiles. If they are reduced by controlled potential electrolysis（CPE） and thus would undergo an umpolung process, the formed negatively charged fullerenes and fullerene derivatives are nucleophiles. In this talk, I will present our recent progress in the electrochemical reactions of fullerene derivatives. Several types of natural fullerene derivatives, which were synthesized by the methodologies developed by ourselves, can be reduced to dianionic species by CPE. The formed dianionic species can then react with a different electrophiles such as benzyl bromide, ethyl bromoacetate, diethyl bromomalonate, acy chlorides, chloroformates to provide new functionalized fullerenes with new addition patterns.

关键词： fullerenes electrochemistry umpolung dianionic species

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