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ACM CHIL 2021 : proceedings of the 2021 ACM Conference on Health, Inference, and Learning : April 8-9, 2021, Virtual Event. ACM Conference on Health, Inference, and Learning (2021 : Online)最新文献

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Verlagsverträge als wissenschaftsgeschichtliche Quelle 出版书籍作为科学历史来源
H. Duchhardt
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引用次数: 0
Urszula Bonter: S. Schottlaender, ein Breslauer Verlag im Kaiserreich 苏特拉•邦特:S.肖特拉德,帝国出版社的出版社
U. Henschel
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引用次数: 0
C C
T. Yeeram, D. Ruffolo, A. Sáiz, N. Kamyan, T. Nutaro
In astrophysical plasmas, magnetic field lines often guide the motions of thermal and non-thermal particles. The field line random walk (FLRW) is typically considered to depend on the Kubo number R = (b/B0)( ‖/ ⊥) for rms magnetic fluctuation b, large-scale mean field B0, and parallel and perpendicular coherence scales ‖ and ⊥, respectively. Here we examine the FLRW when R → ∞ by taking B0 → 0 for finite bz (fluctuation component along B0), which differs from the well-studied route with bz = 0 or bz B0 as the turbulence becomes quasi-twodimensional (quasi-2D). Fluctuations with B0 = 0 are typically isotropic, which serves as a reasonable model of interstellar turbulence. We use a non-perturbative analytic framework based on Corrsin’s hypothesis to determine closed-form solutions for the asymptotic field line diffusion coefficient for three versions of the theory, which are directly related to the k−1 or k−2 moment of the power spectrum. We test these theories by performing computer simulations of the FLRW, obtaining the ratio of diffusion coefficients for two different parameterizations of a field line. Comparing this with theoretical ratios, the random ballistic decorrelation version of the theory agrees well with the simulations. All results exhibit an analog to Bohm diffusion. In the quasi-2D limit, previous works have shown that Corrsin-based theories deviate substantially from simulation results, but here we find that as B0 → 0, they remain in reasonable agreement. We conclude that their applicability is limited not by large R, but rather by quasi-two-dimensionality.
在天体物理等离子体中,磁力线经常指导热和非热粒子的运动。场线随机游走(FLRW)通常被认为分别依赖于rms磁波动b、大规模平均场B0、平行和垂直相干尺度‖和⊥的Kubo数R = (b/B0)(‖/⊥)。本文通过取B0→0作为有限bz(沿B0的波动分量)来研究R→∞时的FLRW,这与bz = 0或bz B0时的路径不同,因为湍流变成了准二维(准二维)。B0 = 0的波动通常是各向同性的,这可以作为星际湍流的合理模型。我们使用基于corsin假设的非微扰分析框架,确定了与功率谱的k−1或k−2矩直接相关的三个版本的渐近场线扩散系数的闭型解。我们通过执行FLRW的计算机模拟来验证这些理论,获得了场线两种不同参数化的扩散系数比。将其与理论比值进行比较,该理论的随机弹道去相关版本与仿真结果很好地吻合。所有结果都与玻姆扩散相似。在准二维极限下,以往的研究表明基于corsin的理论与模拟结果有很大的偏差,但在这里我们发现,当B0→0时,它们仍然保持合理的一致。我们得出结论,它们的适用性不受大R的限制,而是受准二维性的限制。
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引用次数: 0
10 (nat) Naturwissenschaften / Natural Sciences
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引用次数: 0
Patricia F. Blume / Wiebke Helm (Hrsg.): Die Bücherfabrik. Geschichte des Leipziger Otto Spamer Verlages
A. Pehnke
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引用次数: 0
09 (hist) Geschichte, Archäologie, Volkskunde, Völkerkunde / History, Archeology, Folklore, Ethnology 09(历史)历史,Archäologie, Volkskunde, Völkerkunde /历史,考古学,民俗学,民族学
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引用次数: 0
R R
Erfan Ghorbani, M. Alinaghian, G. B. Gharehpetian, Sajad Mohammadi, G. Perboli
The growth of environmental awareness and more robust enforcement of numerous regulations to reduce greenhouse gas (GHG) emissions have directed efforts towards addressing current environmental challenges. Considering the Vehicle Routing Problem (VRP), one of the effective strategies to control greenhouse gas emissions is to convert the fossil fuel-powered fleet into Environmentally Friendly Vehicles (EFVs). Given the multitude of constraints and assumptions defined for different types of VRPs, as well as assumptions and operational constraints specific to each type of EFV, many variants of environmentally friendly VRPs (EF-VRP) have been introduced. In this paper, studies conducted on the subject of EF-VRP are reviewed, considering all the road transport EFV types and problem variants, and classifying and discussing with a single holistic vision. The aim of this paper is twofold. First, it determines a classification of EF-VRP studies based on different types of EFVs, i.e., Alternative-Fuel Vehicles (AFVs), Electric Vehicles (EVs) and Hybrid Vehicles (HVs). Second, it presents a comprehensive survey by considering each variant of the classification, technical constraints and solution methods arising in the literature. The results of this paper show that studies on EF-VRP are relatively novel and there is still room for large improvements in several areas. So, to determine future insights, for each classification of EF-VRP studies, the paper provides the literature gaps and future research needs.
环保意识的增强和减少温室气体排放的众多法规的更强有力的执行,已引导人们努力应对当前的环境挑战。考虑到车辆路径问题(VRP),控制温室气体排放的有效策略之一是将化石燃料驱动的车辆转换为环境友好型车辆(efv)。考虑到为不同类型的vrp定义的众多约束和假设,以及每种类型的EFV特有的假设和操作约束,已经引入了许多环境友好型vrp (EF-VRP)的变体。本文回顾了关于EFV - vrp的研究,考虑了所有道路运输EFV类型和问题变体,并以单一的整体视角进行了分类和讨论。本文的目的是双重的。首先,根据不同类型的电动汽车,即替代燃料汽车(afv)、电动汽车(ev)和混合动力汽车(HVs),确定了EF-VRP研究的分类。其次,综合考虑文献中出现的各种分类、技术约束和解决方法,进行了全面的综述。本文的研究结果表明,EF-VRP的研究相对较新,在一些领域仍有较大的改进空间。因此,为了确定未来的见解,对于EF-VRP研究的每个分类,本文提供了文献空白和未来的研究需求。
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引用次数: 0
Ernst Fischer: Der Buchhandel im deutschsprachigen Exil 1933–1945; Ernst Fischer: Verleger, Buchhändler und Antiquare aus Deutschland und Österreich in der Emigration nach 1933. Ein biographisches Handbuch. 2., aktualisierte und erweiterte Auflage 认真的费舍尔:1930年,德国大陆书店恩斯特·费舍尔:德国和奥地利的出版商,书店和古董商人,在1933年后掀起的移民浪潮中。一本生物说明,2号…更新与放大
Brita Eckert
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引用次数: 0
06 (oek) Wirtschaftswissenschaft / Economic Science
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引用次数: 0
Der Freund, Feind und Biograph von Carl Friedrich Bahrdt 我是卡尔·弗里德里希·Bahrdt的情敌
Dirk Sangmeister
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引用次数: 0
期刊
ACM CHIL 2021 : proceedings of the 2021 ACM Conference on Health, Inference, and Learning : April 8-9, 2021, Virtual Event. ACM Conference on Health, Inference, and Learning (2021 : Online)
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