The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper analyzed transient magnetic fields generated by the lightning current in the presence of 3-D conductive plates. An extended partial element equivalent circuit method was introduced to establish a network with frequency-invariant parameters for time-domain simulation. Three techniques were proposed to reduce the computational complexity in the large-plate simulation, including the analytical...
To ascertain flashover mechanism of the roof external insulation in high-speed airflow environment, breakdown characteristics and mechanisms of short needle-plate air gaps in high-speed airflow were investigated based on an artificial experimental wind-tunnel platform We obtained the breakdown characteristics of the air gaps in wind sand environment by studying the influences of sand mass concentration,...
The presented research is a results of collaboration of mechanical and civil engineering together to solve a complex but essential engineering problem. Land slide is a major natural disaster in Taiwan. Due to global climate change and excess of infrastructure development, the numbers of land slide happening become often, therefore regular inspection become important. Unmanned Aerial Vehicle is a good...
This paper proposes a by incorporating estimated models of simulate thyroid tissue and thyroid electromagnetic inducted ablation needle, the medical personnel can obtain the operating parameters of an electromagnetic heating machine, such as the applied current, ablation time, inserting depth, if necessary.
Exchange biased (EB) antiferromagnetic (AFM) - ferromagnetic (FM) bilayers are essential parts of modern spintronic devices, such as spin valve sensors or magnetic random access memory.
This paper proposes a hybrid MoM/FDTD method for lossy wire structures with rectangular shape. Equivalent circuits are developed to evaluate electric field on the conductor surface. EM fields around the conductor are updated with FDTD equations. A validation case is presented finally.
This paper analyzes transient magnetic shielding made by conductive plates using the PEEC method. A double-exponential function is adopted for eddy current distribution to avoid extensive meshing on the plate. Circuit parameters are determined by evaluating complex power associated with cell currents. A vector-fitting technique is applied to extract frequency-invariant resistance and inductance. A...
This paper addressed surge propagation on a vertical line with a discontinuity. A formula of surge reflection coefficient expressed by specially-defined surge impedance was introduced, which is similar to that of a conventional transmission line. The formula for the discontinuity with a lumped resistance was also presented. With these formulas, surges on the line with the discontinuity can be evaluated...
This paper presents a study of lightning induced surges in railway signaling systems with the FDTD method. During an indirect lightning strike, induced surges are observed in the outdoor circuits due to electric and magnetic coupling. The induced surge currents propagate along the signal cables towards the receiving equipment in railway stations. It is found that geometry of the outdoor lines, earthing...
A novel MEMS distributed phase shifter for D-band application is presented, in which the open-ended CPW lines in series with MEMS bridge provides exactly capacitance in order to optimize the instability caused by the MEMS bridge movement and meet the required loaded capacitance. The planar structure of open-ended CPW lines could enhance the reliability and avoid performance degradation because of...
This paper presents an new modeling method that RF MEMS device is divided into some typical structures, which can be considered as different transmission lines and be modeled respectively to get equivalent circuit model of the device by cascading. Applying the modeling method to DMTL, the equivalent circuit model and the relationship between model parameters and physical size are obtained after MEMS...
A two-dimensional array of micro-discharges in air at atmospheric pressure is studied by cross correlation spectroscopy (CCS) [1]. The array consists of two insulated metal meshes and the discharge is generated by AC voltages at 20 kHz. A gas flow is applied through the array. The temporal resolution of CCS in the sub-ns range allowed to investigate the micro-discharges dynamics within a single micro-discharge...
This paper presents a Partial Element Equivalent Circuit (PEEC) based simulation tool, called TAES for simulating transients in a wire system. The enhancement in the traditional PEEC model with the vector fitting method is provided in order to achieve a time domain simulation for frequency-dependent conductors. A system with steel bars, cables and arrestors is studied and results of experimental verification...
In this paper, a modified FDTD method using a hybrid Cartesian-cylindrical coordinate system is presented for modeling long wires with a axial symmetry structure. The wires are described with FDTD equations in a cylindrical coordinate system, and the non-wire zone in a Cartesian coordinated system. A thin-wire model is employed to link these field equations, and a time-domain solution is available...
Few-layer phosphorene MOSFETs with 0.3-µm-long gate and 15-nm-thick Al2O3 gate insulator was found to exhibit a forward-current cutoff frequency of 2 GHz and a maximum oscillation frequency of 8 GHz after de-embedding for the parasitic capacitance associated mainly with the relatively large probe pads. The gate lag and drain lag of the transistor was found to be on the order of 1 µs or less, which...
We report on a characterization method of the emission spectrum of mm-Wave and terahertz sources without the use of additional terahertz instruments. It exploits the reciprocal properties of these radiating sources. This method can be applied to any source equipped with an antenna. It has been used to characterize the spectral response of two distinct sources. The first is a 0.35 THz ring oscillator...
A hardware-efficient carrier synchronisation technique for multiband RF interconnect system is proposed. This method takes full advantage of the wireline channel's quasi-invariant nature for achieving both energy/cost-efficient system designs. For instance, now easily decouple quadrature signals’ phase and magnitude errors by using 1-bit analogue-to-digital converter (ADC), which saves substantial...
Magnetic shielding is an effective means to reduce low-frequency magnetic fields emitted from power cables and busbars. However, shielding against unbalanced currents has not been addressed well. This paper introduces equivalent magnetic dipoles for discussing magnetic shielding under a monopole current source. It is found that shielding is achieved by the cancellation of magnetic fields from both...
Magnetic property of nanoparticles is intimately related with their structure, size, morphology, and magnetic anisotropy. In recent years, some non-spherical iron oxide nanoparticles are found to have superior performance in biomedical applications compared to their spherical counterparts. For example, iron oxide nanocubes was reported to have higher magnetic heating efficiency in hyper-thermia, and...
In recent years, permanent magnet (PM) machines have received increasing attention for direct-drive applications due to its high efficiency and improved power density performances [1]. In [2], a linear stator permanent magnet vernier (LSPMV) machine is proposed, in which the stator consists of an iron core wound with distributed windings and PMs mounted on the surface of the stator teeth, while the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.