Results 71 to 80 of about 748,632 (287)

Pyridine‐Fused Bis(azacorrole)s: Easily Accessible NIR III Absorbing Cation Radicals and Biradicaloids of Antiaromatic Ground State

Advanced Science, EarlyView.
A series of pyridine‐fused hetero‐ and homodimers containing azacorrole moiety is obtained. The spectral, redox, and magnetic properties of the bis(azacorrole)s reflect an electron‐donating character of these systems and interaction between the subunits which depends on the substitution pattern.
Sha Li, Shaowei Zhang, Xiaofang Li, Oskar Smaga, Kinga Szydełko, Miłosz Pawlicki, Piotr J. Chmielewski   +6 more
wiley   +1 more source

Existence and concentration of homoclinic orbits for first order Hamiltonian systems

Communications in Analysis and Mechanics
This paper is concerned with the following first-order Hamiltonian system $ \begin{equation} \nonumber \dot{z} = \mathscr{J}H_{z}(t, z), \end{equation} $ where the Hamiltonian function $ H(t, z) = \frac{1}{2}Lz\cdot z+A(\epsilon t)G(|z|) $ and ...
Tianfang Wang, Wen Zhang
doaj   +1 more source

Hamiltonian systems with discontinuities [PDF]

arXiv, 2006
Standandard Hamiltonian mechanics in its homogeneous formulation is applied to the study of discontinuities representing rapid changes of Hamiltonians. Different formulations of Hamiltonian mechanics are reviewed. An original representation of a positive homogeneous Hamiltonian system by an outer oriented coisotropic submanifold of the phase space is ...
arxiv  

Electrical Manipulation of Field‐Free Magnetization Switching Driven by Spin‐Orbit Torque in Amorphous Gradient‐Mn3Sn

Advanced Science, EarlyView.
A highly efficient spin current with z‐polarization is achieved in amorphous Mn3Sn with a spontaneous composition gradient, which allows field‐free magnetization switching. Spin current efficiency and magnetization switching polarity are reversibly manipulated by ionic liquid gating, enabling logic functions by pure electrical methods. This work offers
Mingfang Zhang, Bin Cui, Taiyu An, Xue Ren, Weikang Liu, Xiangxiang Zhao, Hehe Ding, Zhiyu Zhang, Xu Zhang, Weijie Kuai, Guangjun Zhou, Bin Cheng, Liang Liu, Jifan Hu   +13 more
wiley   +1 more source

An example in Hamiltonian dynamics

Communications in Analysis and Mechanics
We present an example of a three-degrees-of-freedom polynomial Hamilton function with a critical point characterized by indefinite quadratic part with a Morse index 2.
Henryk Żoła̧dek
doaj   +1 more source

Lectures on integrable Hamiltonian systems [PDF]

arXiv, 2013
We consider integrable Hamiltonian systems in a general setting of invariant submanifolds which need not be compact. For instance, this is the case a global Kepler system, non-autonomous integrable Hamiltonian systems and integrable systems with time-dependent parameters.
arxiv  

High Radiation Resistance in the Binary W‐Ta System Through Small V Additions: A New Paradigm for Nuclear Fusion Materials

Advanced Science, EarlyView.
Refractory high‐entropy alloys exhibit superior radiation tolerance, but face fabrication challenges due to complex compositions. It is demonstrated that reducing the number of alloying elements does not compromise radiation resistance in a novel W‐Ta‐V highly‐concentrated refractory alloy.
Matheus A. Tunes, Darren Parkison, Bochuan Sun, Patrick Willenshofer, Sebastian Samberger, Christoph Frühwirth, Shalini Tripathi, Benjamin K. Derby, Jon Kevin S. Baldwin, Saryu J. Fensin, Damian Sobieraj, Jan S. Wróbel, Jesper Byggmästar, Stefan Pogatscher, Enrique Martinez, Duc Nguyen‐Manh, Osman El‐Atwani   +16 more
wiley   +1 more source

Packaging Metal Atomic Clusters for Universal and Robust Protection through Cluster Beam Process

Advanced Science, EarlyView.
Gas‐phase‐aggregated metal clusters are packaged and well‐protected in poly(methyl methacrylate) (PMMA) through controlled beam implantation. The packaged precise clusters show robust protection against oxidation and agglomeration. This protection also demonstrates universality, as it successfully protects metal clusters composed of various elements ...
Siqi Lu, Zixiang Zhao, Jinsen Han, Jun Wang, Yongxin Zhang, Yu Du, Fangyu Guo, Zhichao Wang, Shenghui Wang, Sichen Tang, Kuojuei Hu, Jianguo Wan, Jiayu Dai, Fengqi Song   +13 more
wiley   +1 more source

Bayesian time‐varying autoregressive models of COVID‐19 epidemics

Biometrical Journal, Volume 65, Issue 1, January 2023., 2023
Abstract The COVID‐19 pandemic has highlighted the importance of reliable statistical models which, based on the available data, can provide accurate forecasts and impact analysis of alternative policy measures. Here we propose Bayesian time‐dependent Poisson autoregressive models that include time‐varying coefficients to estimate the effect of policy ...
Paolo Giudici, Barbara Tarantino, Arkaprava Roy   +2 more
wiley   +1 more source

Giant Nonlinear Hall Effect Induced Ultrahigh Rectification in a Weyl Semiconductor

Advanced Electronic Materials, EarlyView.
Through the exploitation of the nonlinear Hall effect, an ultrahigh voltage responsivity (1.7×106 V W−1) is observed at room temperature in chiral tellurium nanosheets, a Weyl semiconductor with remarkable gate tunability. The voltage responsivity is orders of magnitude larger than those from other nonlinear Hall materials and even commercial Schottky ...
Hao Liu, Ting Yong Lim, Shijia Tian, Jinfeng Zhai, Du Xiang, Tao Liu, Tay‐Rong Chang, Pan He, Jian Shen   +8 more
wiley   +1 more source