Suchergebnisse

Ionic liquids are recently-developed smart materials that are not well known by mechanical engineers. They are of great interest due to their non-volatility, viscosity and extremely high electrical conductivity. Up to now, no reports have appeared on their rheological properties under magnetic or electrical fields. In this work, we study the electro-rheological behaviour of a newly presented ionic liquid (2-hydroxyethylammonium formate). Our experiments show that the ionic liquid is not sensitive to magnetic fields. Nevertheless, resonably high damping ratios (42.8%) have been attained under relatively low electric fields (0.6 kVcm-1).

High-frequency electric field measurements with a regular receiving dipole characterized by poor electrode contact are greatly influenced by the capacitive currents arising between wires and ground. At the same time, making use of the non-contact receiving dipoles is not generally suitable for low-frequency electric field measurements.We introduce a novel hybrid galvanic-capacitive receiving dipole, which could be used for broadband electric field measurement even with high contact resistance of the grounded electrodes.

Electric-field nanobubbles for agriculture
Niall J. English, from Chemical Engineering at University College Dublin, discusses how using electric-field-generated nanobubbles for agriculture is empowering fundamental progress. A fundamental challenge in crop and tillage agriculture lies in providing adequate levels of dissolved oxygen (DO) in the water supply whether via irrigation or spray-delivery methods for respective root-zone or stomatal delivery, with also CO2 in the latter case. This is limited by Henry's Law, which governs thermodynamic gas solubility in liquids.

Electric fields are involved in numerous physiological processes, including directional embryonic development and wound healing following injury. To study these processes in vitro and/or to harness electric field stimulation as a biophysical environmental cue for organised tissue engineering strategies various electric field stimulation systems have been developed. These systems are overall similar in design and have been shown to influence morphology, orientation, migration and phenotype of several different cell types. This review discusses different electric field stimulation setups and their effect on cell response. ; This work has been supported by Science Foundation Ireland, Career Development Award (Grant Agreement Number: 15/CDA/3629) and Science Foundation Ireland / European Regional Development Fund (Grant Agreement Number: 13/RC/2073). This work has also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme, grant agreement No. 866126. The funding agencies were not involved in the design of the study; in the data collection, analysis and interpretation; and in the writing of the manuscript. ; peer-reviewed

1. Introduction -- 2. Field Properties -- 3. Problem Definition -- 4. Linear Spaces in Field Computations -- 5. Projection Methods in Field Computations -- 6. Finite Element Method for Interior Problems -- 7. Finite Element Method for Exterior Problems -- 8. Integral Equation Method -- 9. Static Magnetic Problem -- 10. Eddy Current Problem -- Appendix A Derivation of the Helmholtz Theorem -- Appendix B Properties of the Magnetic Vector Potential, A -- Appendix C Integral Expressions for Scalar Potential from Green's Theorem.

This paper is devoted to the investigation of an evaporation duct in the context of its impact on microwave links communication stability. The work contains the numerical results for previously developed mathematical model based on using the dyadic Green's functions. The electric field intensity dependencies on the receiving antenna suspension height and height of evaporation duct have been obtained for two variants of antenna polarization: horizontal and vertical. These results make it possible to formulate recommendations on how to place the transceiver antennas of microwave links to ensure 24-hour radio communication stability. © Published under licence by IOP Publishing Ltd. ; The work was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006. ; The research was executed by the grant of the Ministry of education and science of the Russian Federation (project № 8.2538.2017/4.6). ; IEEE Antennas and Propagation Society (APS)