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All-Day Thermogalvanic Cells for Environmental Thermal Energy Harvesting

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Research 2019年第1期2019卷 338-347页

作者： Boyang Yu Jiangjiang duan Jia Li Wenke Xie Hongrun Jin rong Liu hui Wang Liang huang Bin hu Jun Zhou Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Direct conversion of the tremendous and ubiquitous low-grade thermal energy into electricity by thermogalvanic cells is a promising strategy for energy *** environment is one of the richest and renewable low-grade thermal ***,critical challenges remain for all-day electricity generation from environmental thermal energy due to the low frequency and small amplitude of temperature fluctuations in the *** this work,we report a tandem device consisting of a polypyrrole(PPy)broadband absorber/radiator,thermogalvanic cell,and thermal storage material(Cu foam/PEG1000)that integrates multiple functions of heating,cooling,and recycling of thermal *** thermogalvanic cell enables continuous utilization of environmental thermal energy at both daytime and nighttime,yielding maximum outputs as high as 0.6 W m^(-2) and 53 mW m^(-2),*** demonstrated outdoors by a large-scale prototype module,this design offers a feasible and promising approach to all-day electricity generation from environmental thermal energy.

关键词： absorber yielding harvesting

The Spatial Patterns of Initial Errors Related to the “Winter Predictability Barrier” of the Indian Ocean Dipole

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Atmospheric and Oceanic Science Letters 2014年第5期7卷 406-410页

作者： FENG rong duan Wan-Suo The National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

In this study, using the Geophysical Fluid Dynamics Laboratory Climate Model version 2pl （GFDL CM2pl） coupled model, the winter predictability barrier （WPB） is found to exist in the model not only in the growing phase but also the Indian Ocean dipole （IOD） decaying phase of positive events due to the effect of initial errors. In particular, the WPB is stronger in the growing phase than in the decaying phase. These results indicate that initial errors can cause the WPB. The domi- nant patterns of the initial errors that cause the occurrence of the WPB often present an eastern-western dipole both in the surface and subsurface temperature components. These initial errors tend to concentrate in a few areas, and these areas may represent the sensitive areas of the predictions of positive IOD events. By increasing observations over these areas and eliminating initial errors here, the WPB phenomenon may be largely weakened and the forecast skill greatly improved.

关键词： Indian Ocean dipole winter predictabilitybarrier initial errors sensitive areas

Improving the high cycle fatigue property of Ti6Al4V ELI alloy by optimizing the surface integrity through electric pulse combined with ultrasonic surface rolling process

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Journal of Materials Science & Technology 2024年第3期170卷 103-121页

作者： Pengfei Sun Shengguan Qu Chenfeng duan Xiongfeng hu Xiaoqiang Li National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China

To improve the surface integrity and high cycle fatigue property of Ti6Al4V ELI alloy,the electric pulse has been introduced into the ultrasonic surface rolling process(USRP),which is called electric pulse-assisted ultrasonic surface rolling process(EUSRP).With the help of“electroplasticity”of the electric pulse,the thickness of the surface gradient deformation layer was about three times of the USRP specimens by adjusting the pulse current ***,the surface hardness decreases due to the continuous effect of the pulse current and the“skin effect”during *** is worth noting that the higher the applied pulse current,the more severe the *** paradox causes the fatigue performance of EUSRP specimens lower than that of USRP *** break this paradox,the EUSRP treatment is followed by a USRP *** EUSRP-2(with a pulse current of 200 A)+USRP specimens exhibit excellent surface hardness,a gradient deformation layer thickness of about 400μm,low surface roughness and high compressive residual compressive ***,the hardening mechanisms of the different surface strengthening specimens have been quantitatively analyzed in combination with microstructure *** fatigue life of Ti6Al4V ELI alloy can be improved by about 25 times at 780 MPa using the EUSRP-2+USRP treatment,the main reason for the highest fatigue life is the deepest surface gradient layer and the deepest crack initiation *** fatigue limit of the EUSRP-2+USRP specimens is not the highest because too much surface hardening causes compressive residual stress relaxation during cycling and the beneficial effect of compressive residual stress is eliminated.

关键词： Ti6Al4V ELI alloy Combined surface treatment Transmission electron microscopy Residual stress Fatigue performance

Development of targeted therapies in treatment of glioblastoma

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Cancer Biology & Medicine 2015年第3期12卷 223-237页

作者： Yuan-Yuan Xu Pei Gao Ying Sun You-rong duan State Key Laboratory of Oncogenes and Related Genes Shanghai Cancer Institute Renji Hospital School of Medicine Shanghai Jiao Tong University

Glioblastoma （GBM） is a type of tumor that is highly lethal despite maximal therapy. Standard therapeutic approaches provide modest improvement in progression-free and overall survival, necessitating the investigation of novel therapies. Oncologic therapy has recently experienced a rapid evolution toward ＂targeted therapy＂, with drugs directed against specific targets which play essential roles in the proliferation, survival, and invasiveness of GBM cells, including numerous molecules involved in signal transduction pathways. Inhihitors of these molecules have already entered or are undergoing clinical trials. However, significant challenges in their development remain because several preclinical and clinical studies present conflicting results. In this article, we will provide an up-to-date review of the current targeted therapies in GBM.

关键词： Glioblastoma (GBM) targeted therapy blood-brain barrier (BBB) clinical trial

Towards total protection from impact:a viability study using EPE foam to protect falling eggs

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Transportation Safety and Environment 2019年第2期1卷 154-163页

作者： Gui-rong Liu Guang Chen Shu-Yong duan Department of Aerospace Engineering and Engineering Mechanics University of Cincinnati2600 Clifton AveCincinnatiOhio45221 USA State Key Laboratory of Reliability and Intelligence of Electrical Equipment HeBei University of TechnologyTianjin City300401 China School of Mechanical Engineering HeBei University of TechnologyTianjin City300401 China

Total protection of fragile goods and equipment during transport has become critically important as fast delivery systems are growing rapidly due to the rise of mass online commerce *** paper therefore studies the protection of falling eggs—one of the most fragile goods—through *** experiments are first conducted to obtain the critical stress at which the eggshell is damaged by falling *** are first conducted of unpackaged eggs dropping onto a granite platform from various *** element method(FEM)models of unpackaged eggs are then built to simulate the behaviour of eggs and compute their stress *** experimental data is compared with the results of FEM simulations to determine the critical stress at which the eggshell is damaged.A series of tests and numerical simulations are then carried out for eggs wrapped in expanded polyethylene(EPE)*** stress distribution of both a single egg and multiple eggs in packaging are *** empirical formula between the drop speed(or height)and the bottom thickness of the EPE foam packaging is obtained,which can be useful in the design of packaging for the total protection of eggs that may fall during usual transport and delivery *** experimental and numerical results from this study show that it is viable to protect fragile goods,as long as the EPE form packaging has sufficient *** proposed study and design procedure are helpful for the selection of key parameters of foam packaging to protect fragile industry products from impact.

关键词： impact protection critical stress EPE foam packaging egg drop test FEM simulation

Characterization of a collection of Chinese fir elite genotypes using *** amplified polymorphism markers

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Journal of Forestry Research 2016年第5期27卷 1105-1110页

作者： Hongjing duan Dehuo hu Yun Li huiquan Zheng National Engineering Laboratory for Tree Breeding Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education College of Biological Sciences and Technology Beijing Forestry University Beijing 100083 People's Republic of China Guangdong Provincial Key Laboratory of Bio-control for the Forest Disease and Pest Guangdong Academy of ForestryGuangzhou 510520 People's Republic of China

Chinese fir [Cunninghamia lanceolata （Lamb.） Hook] is a major timber tree species in China. In the pre- sent study, sequence-related amplified polymorphism （SRAP） markers were used to evaluate the polymorphisms, diversity, and relationships in a collection of Chinese fir elite genotypes （n = 103） from the Lechang provenance, an endangered provenance. Thirty-five SRAP primer combinations produced 620 bands among the tested 103 Lechang provenance genotypes and 17 nonSLechang provenance genotypes; 577 （93.1%） of these were polymorphic, yielding an average of 16.5 polymorphic bands per primer combination. Of the SRAP primer combinations （n = 35）, I4 ones identified 〉70.0 % of the 120 genotypes. The Mel2-Eml9 combination had the strongest discriminatory ability with 93.3 % of the genotypes iden- tified. An UPGMA dendrogram further showed that most of the Lechang provenance genotypes （87.4 %） grouped together （Cluster A）. The Lechang genotypes had a con- siderable amount of genetic variation with genetic simi- larity from 0.40 to 0.81. The current work may facilitate the management of the endangered Lechang Chinese fir provenance.

关键词： Chinese fir SRAP Germplasm Geneticvariation - Dendrogram

Vibration Response and Stress Analysis of Planar Elastic Tube Bundle Induced by Fluid Flow

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 89-96页

作者： De-rong duan Pei-Qi Ge Wen-Bo Bi Yan-Ying Dong School of Mechanical Engineering Shandong University Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Shandong University

Flow?induced vibration plays a positive role on heat transfer enhancement. Meanwhile, it is also a negative factor for fatigue strength. Satisfying the fatigue strength is the primary prerequisite for heat transfer enhancement. This paper numerically studied the flow?induced vibration of planar elastic tube bundle based on a two?way fluid–structure interaction(FSI) calculation. The numerical calculation involved the unsteady, three?dimensional incompressible governing equations solved with finite volume approach and the dynamic balance equation of planar elastic tube bundle solved with finite element method combined with dynamic mesh scheme. The numerical approach was verified by comparing with the published experimental results. Then the vibration trajectory, deformation and stress contour of planar elastic tube bundle were all studied. Results show that the combined movement of planar elastic tube bundle represents the agitation from inside to outside. The vibration of out?of?plane is the main vibration form with the typically sinusoidal behavior because the magnitude of displacement along the out?of?plane direction is the 100 times than the value of in?plane direction. The dangerous point locates in the innermost tube where the equivalent stress can be utilized to study the multiaxial fatigue of planar elastic tube bundle due to the alternating stress concentration. In the velocity range of 0.2-3 m/s, it is inferred that the vibration amplitude plays a role on the stress response and the stress amplitude is susceptible to the fluid velocity. This research paves a way for studying the fatigue strength of planar elastic tube bundle by flow?induced vibration.

关键词： Flow?induced vibration Planar elastic tube bundle Vibration response Stress analysis

Atomic Interface Catalytically Synthesizing SnP/CoP Hetero-Nanocrystals within Dual-Carbon Hybrids for Ultrafast Lithium-Ion Batteries

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Engineering 2022年第11期18卷 154-160页

作者： Chen hu Yanjie hu Aiping Chen Xuezhi duan Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Tin phosphides are attractive anode materials for ultrafast lithium-ion batteries(LIBs)because of their ultrahigh Li-ion diffusion capability and large theoretical-specific ***,difficulties in synthesis and large size enabling electrochemical irreversibility impede their ***,an in situ catalytic phosphorization strategy is developed to synthesize SnP/CoP hetero-nanocrystals within reduced graphene oxide(rGO)-coated carbon frameworks,in which the SnP relative formation energy is significantly decreased according to density functional theory(DFT)*** optimized hybrids exhibit ultrafast charge/discharge capability(260 mA·h·g^(-1)at 50 A·g^(-1))without capacity fading(645 mA·h·g^(-1)at 2 A·g^(-1))through 1500 *** lithiation/delithiation mechanism is disclosed,showing that the 4.0 nm sized SnP/CoP nanocrystals possess a very high reversibility and that the previously formed metallic Co of CoP at a relatively high potential accelerates the subsequent reaction kinetics of SnP,hence endowing them with ultrafast charge/discharge capability,which is further verified by the relative dynamic current density distributions according to the finite element analysis.

关键词： Catalytic phosphorization SnP Hetero-nanocrystals Fast charging Li-ion batteries

n-Channel Organic Transistors Processed from Halogen-Free Solvents： Solvent Effect on Thin-Film Morphology and Charge Transport

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Chinese Journal of Chemistry 2016年第7期34卷 689-695页

作者： Simin Gao Yonghui hu Zhiming duan Xike Gao Department of Chemistry College of Science Shanghai University Shanghai 200444 China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Non-chlorinated solvents are highly preferable for organic electronic processing due to their environmentally friendly characteristics. Four different halogen-free solvents, tetrafuran, toluene, meta-xylene and 1,2,4-trimethyl- benzene, were selected to fabricate n-channel organic thin film transistors （OTFTs） based on 3-hexylundecyl sub- stituted naphthalene diimides fused with （1,3-dithiol-2-ylidene）malononitrile groups （NDI3hu-DTYM2）. The OTFTs based on NDI3hu-DTYM2 showed electron mobility of up to 1.37 cm2-V-1·s -1 under ambient condition. This is among the highest device performance for n-channel OTFTs processed from halogen-free solvents. The dif- ferent thin-film morphologies, from featureless low crystalline morphology to well-aligned nanofibres, have a great effect on the device performance. These results might shed some light on solvent selection and the resulting solution process for organic electronic devices.

关键词： organic thin film transistor non-chlorinated solvents electron transport