Results 1 to 10 of about 85,497 (120)
Analytic embedding of pseudo-Helmholtz geometry [PDF]
Известия Саратовского университета. Новая серия: Математика. Механика. Информатика, 2021 For modern geometry, the study of maximal mobility geometries is of great importance. Some of these geometries are well studied (Euclidean, pseudo-Euclidean, symplectic, spherical, Lobachevsky, etc.), and others are poorly understood (Helmholtz, pseudo ...
Kyrov, Vladimir A.
doaj +1 more source
Mechanical Engineering Journal, 2021 This paper describes the optimum tuning of damped Helmholtz silencers. In this study, Helmholtz resonators are used as silencers that suppress acoustic resonance in host acoustic fields. Side branch silencers and Helmholtz silencers are commonly known as
Keisuke YAMADA +4 more
doaj +1 more source
Journal of Mathematics, 2022 The Quasi-Reversibility Regularization Method (Q-RRM) provides stable approximate solution of the Cauchy problem of the Helmholtz equation in the Hilbert space by providing either additional information in the Laplace-type operator in the Helmholtz ...
Benedict Barnes +3 more
doaj +1 more source
Sensors, 2022 In this study, a piezoelectric micromachined ultrasonic transducer (PMUT) is integrated with a microliter-sized volume-tunable Helmholtz resonator. The passive Helmholtz resonator is constructed using an SU8 photolithography-defined square opening plate ...
Guo-Hua Feng, Wen-Sheng Chen
doaj +1 more source
Journal of Low Frequency Noise, Vibration and Active Control, 2023 Helmholtz resonators are widely applied in industries to reduce the transmission of unwanted noise and passively attenuate tonal noise in pipes/ducts. For example, internal combustion engines take advantage of Helmholtz resonators by combining air box ...
Zhiguo Zhang, Chenzhen Ji, Yin Mya Win
doaj +1 more source
Helmholtz Solving and Performance Optimization in Global/Regional Assimilation and Prediction System
Tsinghua Science and Technology, 2021 Despite efficient parallelism in the solution of physical parameterization in the Global/Regional Assimilation and Prediction System (GRAPES), the Helmholtz equation in the dynamic core, with the increase of resolution, can hardly achieve sufficient ...
Jianqiang Huang +5 more
doaj +1 more source
Philosophia Scientiæ, 2005 We propose a French translation of the preface written by H. nov Helmholtz to the second part of volume one of the translation of the Treatise on Natural Philosophy due to Sir William Thompson and Tait.
Hermann von Helmholtz
doaj +1 more source
Sur l’ambition de vulgariser la science (1874)
Philosophia Scientiæ, 2005 We propose a French translation of the preface written by H. nov Helmholtz to the German translation of Fragments of Science by Tyndall. The German translation was by Anna von Helmholtz and Du-Bois Reymond and reviewed by H. von Helmholtz. The numbers in
Hermann von Helmholtz
doaj +1 more source
Известия высших учебных заведений: Нефть и газ, 2017 Based on the analysis of the existing material on pumping liquids with pressure pulses into the borehole we suggest to consider wellhead injection. The processes of the pressure pulse propagation in the pumped liquid by using wellhead pulsers.
M. Ya. Habibullin +3 more
doaj +1 more source
Mathematics, 2023 In this work, it is shown that the geometry of a gravity field generated by a spheroid with low eccentricity can be described with the help of a newly modified Helmholtz equation.
Gerassimos Manoussakis
doaj +1 more source