共查询到20条相似文献,搜索用时 15 毫秒
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SnO2 Nanoparticles: Graphene‐Skeleton Heat‐Coordinated and Nanoamorphous‐Surface‐State Controlled Pseudo‐Negative‐Photoconductivity of Tiny SnO2 Nanoparticles (Adv. Mater. 23/2015) 下载免费PDF全文
Longwei Ding Nishuang Liu Luying Li Xing Wei Xianghui Zhang Jun Su Jiangyu Rao Congxing Yang Wenzhi Li Jianbo Wang Haoshuang Gu Yihua Gao 《Advanced materials (Deerfield Beach, Fla.)》2015,27(23):3579-3579
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Gary A. Dilts 《International journal for numerical methods in engineering》1999,44(8):1115-1155
The Smooth‐Particle‐Hydrodynamics (SPH) method is derived in a novel manner by means of a Galerkin approximation applied to the Lagrangian equations of continuum mechanics as in the finite‐element method. This derivation is modified to replace the SPH interpolant with the Moving‐Least‐Squares (MLS) interpolant of Lancaster and Saulkaskas, and define a new particle volume which ensures thermodynamic compatibility. A variable‐rank modification of the MLS interpolants which retains their desirable summation properties is introduced to remove the singularities that occur when divergent flow reduces the number of neighbours of a particle to less than the minimum required. A surprise benefit of the Galerkin SPH derivation is a theoretical justification of a common ad hoc technique for variable‐h SPH. The new MLSPH method is conservative if an anti‐symmetric quadrature rule for the stiffness matrix elements can be supplied. In this paper, a simple one‐point collocation rule is used to retain similarity with SPH, leading to a non‐conservative method. Several examples document how MLSPH renders dramatic improvements due to the linear consistency of its gradients on three canonical difficulties of the SPH method: spurious boundary effects, erroneous rates of strain and rotation and tension instability. Two of these examples are non‐linear Lagrangian patch tests with analytic solutions with which MLSPH agrees almost exactly. The examples also show that MLSPH is not absolutely stable if the problems are run to very long times. A linear stability analysis explains both why it is more stable than SPH and not yet absolutely stable and an argument is made that for realistic dynamic problems MLSPH is stable enough. The notion of coherent particles, for which the numerical stability is identical to the physical stability, is introduced. The new method is easily retrofitted into a generic SPH code and some observations on performance are made. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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High‐Performance n‐Channel Organic Transistors Using High‐Molecular‐Weight Electron‐Deficient Copolymers and Amine‐Tailed Self‐Assembled Monolayers 下载免费PDF全文
Yang Wang Tsukasa Hasegawa Hidetoshi Matsumoto Takehiko Mori Tsuyoshi Michinobu 《Advanced materials (Deerfield Beach, Fla.)》2018,30(13)
While high‐performance p‐type semiconducting polymers are widely reported, their n‐type counterparts are still rare in terms of quantity and quality. Here, an improved Stille polymerization protocol using chlorobenzene as the solvent and palladium(0)/copper(I) as the catalyst is developed to synthesize high‐quality n‐type polymers with number‐average molecular weight up to 105 g mol?1. Furthermore, by sp2‐nitrogen atoms (sp2‐N) substitution, three new n‐type polymers, namely, pBTTz, pPPT, and pSNT, are synthesized, and the effect of different sp2‐N substitution positions on the device performances is studied for the first time. It is found that the incorporation of sp2‐N into the acceptor units rather than the donor units results in superior crystalline microstructures and higher electron mobilities. Furthermore, an amine‐tailed self‐assembled monolayer (SAM) is smoothly formed on a Si/SiO2 substrate by a simple spin‐coating technique, which can facilitate the accumulation of electrons and lead to more perfect unipolar n‐type transistor performances. Therefore, a remarkably high unipolar electron mobility up to 5.35 cm2 V?1 s?1 with a low threshold voltage (≈1 V) and high on/off current ratio of ≈107 is demonstrated for the pSNT‐based devices, which are among the highest values for unipolar n‐type semiconducting polymers. 相似文献
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Plasmonic Nanostructures: 3D Nanostar Dimers with a Sub‐10‐nm Gap for Single‐/Few‐Molecule Surface‐Enhanced Raman Scattering (Adv. Mater. 15/2014) 下载免费PDF全文
Manohar Chirumamilla Andrea Toma Anisha Gopalakrishnan Gobind Das Remo Proietti Zaccaria Roman Krahne Eliana Rondanina Marco Leoncini Carlo Liberale Francesco De Angelis Enzo Di Fabrizio 《Advanced materials (Deerfield Beach, Fla.)》2014,26(15):2352-2352
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Graphene‐Skeleton Heat‐Coordinated and Nanoamorphous‐Surface‐State Controlled Pseudo‐Negative‐Photoconductivity of Tiny SnO2 Nanoparticles 下载免费PDF全文
Longwei Ding Nishuang Liu Luying Li Xing Wei Xianghui Zhang Jun Su Jiangyu Rao Congxing Yang Wenzhi Li Jianbo Wang Haoshuang Gu Yihua Gao 《Advanced materials (Deerfield Beach, Fla.)》2015,27(23):3525-3532
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Organic Light‐Emitting Devices: Instant Low‐Temperature Cross‐Linking of Poly(N‐vinylcarbazole) for Solution‐Processed Multilayer Blue Phosphorescent Organic Light‐Emitting Devices (Adv. Mater. 45/2014) 下载免费PDF全文
Naoya Aizawa Yong‐Jin Pu Takayuki Chiba So Kawata Hisahiro Sasabe Junji Kido 《Advanced materials (Deerfield Beach, Fla.)》2014,26(45):7675-7675
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Optical Microresonators: Chip‐Scale Fabrication of High‐Q All‐Glass Toroidal Microresonators for Single‐Particle Label‐Free Imaging (Adv. Mater. 15/2016) 下载免费PDF全文
Kassandra A. Knapper Kevin D. Heylman Erik H. Horak Randall H. Goldsmith 《Advanced materials (Deerfield Beach, Fla.)》2016,28(15):2944-2944
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Organic Thin‐Film Transistors: Thiazole Imide‐Based All‐Acceptor Homopolymer: Achieving High‐Performance Unipolar Electron Transport in Organic Thin‐Film Transistors (Adv. Mater. 10/2018) 下载免费PDF全文
Yongqiang Shi Han Guo Minchao Qin Jiuyang Zhao Yuxi Wang Hang Wang Yulun Wang Antonio Facchetti Xinhui Lu Xugang Guo 《Advanced materials (Deerfield Beach, Fla.)》2018,30(10)
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Carbon Nanoframes: Well‐Dispersed ZIF‐Derived Co,N‐Co‐doped Carbon Nanoframes through Mesoporous‐Silica‐Protected Calcination as Efficient Oxygen Reduction Electrocatalysts (Adv. Mater. 8/2016) 下载免费PDF全文
Lu Shang Huijun Yu Xing Huang Tong Bian Run Shi Yufei Zhao Geoffrey I. N. Waterhouse Li‐Zhu Wu Chen‐Ho Tung Tierui Zhang 《Advanced materials (Deerfield Beach, Fla.)》2016,28(8):1712-1712
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A Self‐Quenching‐Resistant Carbon‐Dot Powder with Tunable Solid‐State Fluorescence and Construction of Dual‐Fluorescence Morphologies for White Light‐Emission 下载免费PDF全文
Yonghao Chen Mingtao Zheng Yong Xiao Hanwu Dong Haoran Zhang Jianle Zhuang Hang Hu Bingfu Lei Yingliang Liu 《Advanced materials (Deerfield Beach, Fla.)》2016,28(2):312-318