American Journal of Physics and Applications

Volume 7, Issue 1, January 2019

  • Motion and Interaction of Envelope Solitons in Schrödinger Equation Simulated by Symplectic Algorithm

    Lai Lianyou, Xu Weijian

    Issue: Volume 7, Issue 1, January 2019
    Pages: 1-7
    Received: Nov. 18, 2018
    Accepted: Dec. 14, 2018
    Published: Jan. 21, 2019
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    Abstract: The expression of Gaussian envelope soliton in Schrödinger equations are given and proved in this paper. According to the characteristics of the Gauss envelope soliton, further proposed that the interaction between Gaussian envelope solitons exists in Schrödinger equation. The symplectic algorithm for solving Schrödinger equation is proposed after ... Show More
  • Spin Dynamics in the Ferromagnetic Resonance

    Hongyu Wen, Jianbai Xia

    Issue: Volume 7, Issue 1, January 2019
    Pages: 8-13
    Received: Dec. 24, 2018
    Accepted: Jan. 21, 2019
    Published: Feb. 15, 2019
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    Abstract: The LLG equation including the spin-transfer torque term, and the frequency spectrum analysis method are used to study the dynamic process of ferromagnetic resonance. The effects of damping factor α, internal anisotropic field, magnetic field inclination, and spin-transfer torque caused by the spin current are studied. The following results are fou... Show More
  • Evaluation of Nanoemulsion Concentrate Botanical Fungicide from Neem, Citronella and Eugenol Oil Using Palm Oil Based Surfactant

    Melati Septiyanti, Muhammad Rizky Mulyana, Rahmawati Putri, Yenny Meliana

    Issue: Volume 7, Issue 1, January 2019
    Pages: 14-20
    Received: Dec. 14, 2018
    Accepted: Jan. 23, 2019
    Published: Feb. 22, 2019
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    Abstract: Pathogenic fungi has became a problem and caused crop failure. Synthetic fungicide was commonly used to control the growth of the fungi, however it has an adverse effect which can pollute the environment. As an alternative, botanical fungicide can be used as antifungal agent which is safer for environment. Neem oil has been reported as inhibitor fo... Show More
  • The Average Energy and Molar Specific Heat at Constant Volume of an Einstein Solid Measured by an Observer with Fluctuating Frame of Reference

    Yun-Sok Shin

    Issue: Volume 7, Issue 1, January 2019
    Pages: 21-26
    Received: Dec. 15, 2018
    Accepted: Jan. 11, 2019
    Published: Feb. 22, 2019
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    Abstract: We report an observer effect in an Einstein solid, a quantum-mechanical system, induced by fluctuations of an observer’s frame of reference; which has been studied so far under the assumption that the observer’s frame of reference remains constant throughout the performance of a measurement, thus, what is actually measured throughout the performanc... Show More
  • Chimera States in Three Populations of Pendulum-Like Elements with Inertia

    Hao Yin

    Issue: Volume 7, Issue 1, January 2019
    Pages: 27-33
    Received: Jan. 24, 2019
    Accepted: Mar. 06, 2019
    Published: Mar. 19, 2019
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    Abstract: The aim of this study is to investigate the chimera states in three populations of pendulum-like elements with inertia in varying network topology. Considering the coupling strength between oscillators within each population is stronger than the inter-population coupling, we search for the chimera states in three populations of pendulum-like elemen... Show More