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.
Space-charge-limited (SCL) electron flow describes the maxi mum current density allowed for steady-state electron beam transport across planar, cylindrical, or spherical diode1, 2. Base on a transit time model3, it is found that the Langmuir-Blodgett (LB) solutions for the SCL current density, for both cylindrical and spherical diodes, may be approximated by a novel scaling law Japp = 4/9∊0√2e/mEc...
It is found that the Langmuir-Blodgett (LB) solutions for the space charge limited current density, for both cylindrical and spherical diodes, may be approximated by Japp =(4/9)ε0(2e/m)1/2Ec3/2/D1/2 over a wide range of parameters, where Ec is the surface electric field on the cathode of the vacuum diode and D is the anode-cathode spacing. This dependence is valid whether Ra/Rc is greater than or...
In this paper a 60 GHz antenna-in-package with end-fire radiation in LTCC is presented. Compared with the method mounting the chip on the side of the antenna package, the proposed antenna-in-package (AiP) configuration carries the chip on top of it to greatly save the area of RF front-end. In addition, the symmetric posts are introduced to widen the bandwidth. The metal match rings are added to smooth...
The practice and future plans of smart grids in Europe are discussed in this paper. Firstly, the features of current power grid in Europe are introduced. Then, the plan of future European power grid with high penetration of renewable energy is introduced. After that, the practice of smart operation of interstate power grid is given. Finally, the most concerned issues and plans for the smart operation...
The controller for Archimedes wave swing (AWS) based wave energy conversion (WEC) system is designed in this paper. Based on the model of the AWS based WEC system in the d-q frame of reference, the control strategy of the WEC system under the irregular wave is derived. The AWS based WEC is regulated to be in resonance with the wave by the stiffness control of the linear permanent magnet generator,...
Formative eAssessment can be very helpful in providing high quality higher education assignments. However, there are obstacles restricting the uptake of formative eAssessment in higher education including both cultural and technical issues. When a university is encouraging the uptake of formative eAssessment internally it is useful to have case studies from academic schools detailing how academics...
Summary form only given. In this paper, Particle-In-Cell (PIC) simulation has been used to simulate the coherent Smith-Purcell (SP) radiation source at about 1 THz frequency. We have studied three different kinds of methods in order to decrease the required threshold to gene rate coherent THz radiation. The first method is to optimize the geometrical size of the grating with a CW electron beam. For...
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.