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.
Ballistic reentry target trajectory tracking is an important application of nonlinear filtering problems. Under non-Gaussian noise, Standard Particle Filter (SPF) and many revised PFs (i.e. MSRCQPF) can obtain good results. However, the two algorithms may meet some defects respectively, such as particle degradation, large computational complexity and so on. This paper propose a multimode sampling...
A novel Delay Manager (DM) based on the Digital DLL designed to adjust the delay time of the FPGA's IO port is proposed. The DDLL leverage the oversample mechanism to achieve high integration density and low power. A novel gear-shift component is utilized for both fast and precise locking in. To be adequate for digital data transmit, a new full-swing delay cell with good edge matching performance...
Atmospheric direct current (dc) corona discharge from thin wires or sharp needles has been widely used as an ion source in many devices such as photocopiers, laser printers, and electronic air cleaners. Existing numerical models to predict the electron distribution in the corona plasma are based on charge continuity equations and the simplified Boltzmann equation. In this paper, negative dc corona...
1.5 μm polarization entanglement generation is experimentally demonstrated based on birefringence in polarization maintained dispersion shifted fiber. Two-photon interference with visibility of >89% without subtracting background counts is achieved, indicating its polarization entanglement property.
In this paper, the cathode evaporation rate during current emission is measured. The quartz crystal microbalance (QCM) method is used to measure the thickness of the deposited active materials in vacuum. The principle of the QCM is that a frequency shift is introduced when evaporated materials are deposited on the crystal. The evaporation of active materials is measured at different cathode temperature...
Based on 1960-2003 rainfall and small-sized evaporation pan measurements from 131 stations in NW China, an aridity-wetness homogenized index is proposed of rainfall and evaporation as the crucial components of hydrological equilibrium, whereupon research is made of space/time characteristics of the climate that may change from a warm, dry to warm, wet phase in this region. Results show that 1) a regional...
Using in situ observations, study is performed on a few related properties of wind raised sand grains during sandstorms in the Yanchi area of Ninxia in NW China, indicating that the critical wind responsible for sands lifting from 10 m level above surface is 5.0 m/s and the critical frictional velocity is 0.32 m/s, the maximal amount of sand transport is 12.42 kg m-1 based on the "scheme of maximum...
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.