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Dong Wang

Bio: Dong Wang is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Scanning tunneling microscope & Medicine. The author has an hindex of 49, co-authored 491 publications receiving 9970 citations. Previous affiliations of Dong Wang include University of Science and Technology of China & Shanghai University.


Papers
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Journal ArticleDOI
TL;DR: In this paper , ent-kaurane diterpenoids from the roots and stems of Phyllanthus acidus (L.) Skeels were reported for the first time, and their structures were elucidated on the basis of extensive spectroscopic analyses.

2 citations

Posted Content
TL;DR: In this article, the echo-enabled harmonic generation (EEHG) free-electron laser (FEL) has been demonstrated at lower harmonics and the first lasing at third harmonic also has been achieved at Shanghai deep ultra-violet FEL (SDUV-FEL).
Abstract: The echo-enabled harmonic generation (EEHG) free-electron laser (FEL) has been already demonstrated at lower harmonics and the first lasing at third harmonic also has been achieved at Shanghai deep ultra-violet FEL (SDUV-FEL). While the great advantage of much higher harmonic up-conversion efficiency of EEHG over other seeded FELs only shows evidently at much higher harmonics. In this paper, we investigate the possibility of EEHG lasing at 10-th harmonic of the seed laser at SDUV-FEL, both physical designs and numerical simulations have been studied carefully. Two proposals of EEHG at 10-th harmonic have been studied respectively, i.e. with the seed lasers of the same color and two difference colors, the simulation results indicate that both approaches could be the candidate for EEHG lasing at 10-th harmonic at SDUV-FEL, meanwhile the coherent synchrotron radiation does not affect the performance of EEHG-FEL but only slightly shifts the central radiation frequency.

2 citations

Journal ArticleDOI
TL;DR: Based on the most efficient electron acceleration near the midplane of 3D non-neutral driven reconnecting current sheet (RCS) and the electrostatic wave excitation by the drift Maxwellian distribution of electrons in Vlasov simulation, Wang et al. as mentioned in this paper investigated how these waves affect the electron acceleration and showed that when the electron's velocity equals to the phase speed of the waves, they will be trapped and have different accelerating characteristics from the untrapped electrons through solving the momentum equations of electrons analytically.

2 citations

Patent
28 Sep 2016
TL;DR: In this article, a method for quantitatively analyzing underground water numerical simulation uncertainty based on information entropy is proposed, which comprises the steps that the information entropy of predictive variable probability distribution is adopted as the uncertainty of a variable, and according to the predictor formula and information entropy theory of a Bayesian model averaging method, the underground prediction uncertainty is decomposed into a model structure, model parameters and the overlapped uncertainty among various concept model prediction distributions.
Abstract: The invention provides a method for quantitatively analyzing underground water numerical simulation uncertainty based on information entropy. The method comprises the steps that the information entropy of predictive variable probability distribution is adopted as the uncertainty of a variable, and according to the predictor formula and information entropy theory of a Bayesian model averaging method, the underground prediction uncertainty is decomposed into a model structure, model parameters and the overlapped uncertainty among various concept model prediction distributions. The uncertainty of each probability distribution type random variable can be measured, the defect that a traditional variance method can only measure normal distribution is overcome, and the application range of quantitative uncertainty analysis is enlarged; the underground water numerical simulation uncertainty breaks up into model parameters, the model structure and the overlapped uncertainty, and the defect that the overlapped uncertainty cannot be described through the traditional variance method can be overcome; the model parameter uncertainty is defined as the difference obtained by subtracting the model overlapped uncertainty from the sum of various concept model interior (parameter) uncertainty weights, and therefore the uncertainties are described more accurately and reasonably.

2 citations

Book ChapterDOI
TL;DR: In this paper, the evolution of grain boundary phases during high temperature creep has been systematically investigated in a directionally solidified Ni-base superalloy, and the phase transformation between M23(C,B)6 and M5BB3 is thought to correlate strongly with the strain rate of different creep stages.
Abstract: The evolution of grain boundary phases during high temperature creep has been systematically investigated in a directionally solidified Ni-base superalloy. At the primary creep stage, precipitation of nanosize M5BB3 boride from γ matrix and phase transformation from M23(C,B)6 borocarbide to M5B3B boride occur at grain boundaries. At the steady-state creep stage, precipitation of blocky M23(C,B)6 borocarbide and coarsening of M23(C,B)6 with the dissolution of M5BB3 boride occur at grain boundaries. At the tertiary creep stage, precipitation of M5B3B boride from γ matrix or phase transformation from M23(C,B)6 borocarbide to M5BB3 boride occur again at grain boundaries. The precipitation of M5B3B is due to diffusion of B atoms promoted by applied tensile stress during high temperature creep, and the phase transformation between M23(C,B)6 and M5BB3 is thought to correlate strongly with the strain rate of different creep stages.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: Extracellular vesicles are now considered as an additional mechanism for intercellular communication, allowing cells to exchange proteins, lipids and genetic material.
Abstract: Extracellular vesicles are a heterogeneous group of cell-derived membranous structures comprising exosomes and microvesicles, which originate from the endosomal system or which are shed from the plasma membrane, respectively They are present in biological fluids and are involved in multiple physiological and pathological processes Extracellular vesicles are now considered as an additional mechanism for intercellular communication, allowing cells to exchange proteins, lipids and genetic material Knowledge of the cellular processes that govern extracellular vesicle biology is essential to shed light on the physiological and pathological functions of these vesicles as well as on clinical applications involving their use and/or analysis However, in this expanding field, much remains unknown regarding the origin, biogenesis, secretion, targeting and fate of these vesicles

4,241 citations

Journal ArticleDOI
TL;DR: This review presents a comprehensive overview of the lithium metal anode and its dendritic lithium growth, summarizing the theoretical and experimental achievements and endeavors to realize the practical applications of lithium metal batteries.
Abstract: The lithium metal battery is strongly considered to be one of the most promising candidates for high-energy-density energy storage devices in our modern and technology-based society. However, uncontrollable lithium dendrite growth induces poor cycling efficiency and severe safety concerns, dragging lithium metal batteries out of practical applications. This review presents a comprehensive overview of the lithium metal anode and its dendritic lithium growth. First, the working principles and technical challenges of a lithium metal anode are underscored. Specific attention is paid to the mechanistic understandings and quantitative models for solid electrolyte interphase (SEI) formation, lithium dendrite nucleation, and growth. On the basis of previous theoretical understanding and analysis, recently proposed strategies to suppress dendrite growth of lithium metal anode and some other metal anodes are reviewed. A section dedicated to the potential of full-cell lithium metal batteries for practical applicatio...

3,812 citations

Journal ArticleDOI
TL;DR: The unique advances on ultrathin 2D nanomaterials are introduced, followed by the description of their composition and crystal structures, and the assortments of their synthetic methods are summarized.
Abstract: Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances. First, we introduce the unique advances on ultrathin 2D nanomaterials, followed by the description of their composition and crystal structures. The assortments of their synthetic methods are then summarized, including insights on their advantages and limitations, alongside some recommendations on suitable characterization techniques. We also discuss in detail the utilization of these ultrathin 2D nanomaterials for wide ranges of potential applications among the electronics/optoelectronics, electrocat...

3,628 citations

Journal ArticleDOI
22 Jan 2016-Science
TL;DR: In this paper, the oxygen reduction reaction (ORR) active site was characterized by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species.
Abstract: Nitrogen (N)-doped carbon materials exhibit high electrocatalytic activity for the oxygen reduction reaction (ORR), which is essential for several renewable energy systems. However, the ORR active site (or sites) is unclear, which retards further developments of high-performance catalysts. Here, we characterized the ORR active site by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species. The ORR active site is created by pyridinic N. Carbon dioxide adsorption experiments indicated that pyridinic N also creates Lewis basic sites. The specific activities per pyridinic N in the HOPG model catalysts are comparable with those of N-doped graphene powder catalysts. Thus, the ORR active sites in N-doped carbon materials are carbon atoms with Lewis basicity next to pyridinic N.

3,201 citations

Journal ArticleDOI
TL;DR: This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts and metal-free catalysts.
Abstract: The recent advances in electrocatalysis for oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs) are thoroughly reviewed. This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core–shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts, and metal-free catalysts. The recent development of ORR electrocatalysts with novel structures and compositions is highlighted. The understandings of the correlation between the activity and the shape, size, composition, and synthesis method are summarized. For the carbon-based materials, their performance and stability in fuel cells and comparisons with those of platinum are documented. The research directions as well as perspectives on the further development of more active and less expensive electrocatalysts are provided.

2,964 citations