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.
The Visible Infrared Imaging Radiometer Suite (VIIRS) Day-Night Band (DNB) onboard the Suomi-National Polar Orbiting Partnership (S-NPP) satellite measures broadband visible radiances providing imagery of clouds and other Earth features over illumination levels spanning 7 orders of magnitude, ranging from quarter moon to full sunlight (3e-5 to 200 W/m2/sr). Due to its original purpose to provide imagery...
This paper presents a low-cost technique to reduce offset voltage of a dynamic comparator. The proposed method is based on output-data phase measuring. A full-digital implementation is used to measure phase without impacting offset accuracy. Simulation and measured results show that the eye-diagram at the compartor input can be shifted up to 245mV due to offset, achieving a successful correction,...
Ethanol or alcohol, C2H5OH, it can be obtained by synthesis, but especially by the fermentation of sugars. Fermentation of sugars is used to obtain the highest amount of alcohol. The chronic consumption of alcoholic beverages in large quantities leads to the disease of the liver, kidneys, cardiovascular system, nervous system, gastritis. Chronic alcoholism is a form of drug abuse. A 1% alcohol can...
In order to reduce measure standard uncertainty and achieve precise calibration of Port Quick Leak Detector in different temperatures under full range, the special calibration apparatus was designed on basis of theoretical studies. This apparatus consists of pressure standard leak system, calibration system, temperature control system, gas supply and pump system. Pressure standard leak system is made...
VFAT3 is the last version of a family of multichannel trigger and tracking ASICs designed for the upgrade of the CMS experiment in the LHC. The chip has been developed to provide fast trigger information from the readout of gas particle detectors improving the resolution of the time measurement. The VFAT3 architecture comprises 128 analog channels, each one composed by a low noise and low power charge...
TIGER (Turin Integrated Gem Electronics for Readout) is a mixed-mode front-end ASIC developed to readout the new inner tracking detector of the BESIII experiment, carried out at BEPCII in Beijing. The detector is planned to be installed during the 2018 upgrade and features an innovative three-layer triple-CGEM (Cylindrical Gas Electron Multiplier) with analog readout. The ASIC comprises 64 channels,...
In this paper, we propose an accurate automatic chessboard corner detecting algorithm of sub-pixel precision. The algorithm is based on a novel hyperbolic tangent model. A set of corners are detected initially by Harris' algorithm. Then the hyperbolic tangent model for each corner point is optimized by parameter adjustment. Finally, we use the optimal model to obtain the sub-pixel position of each...
Conventional fire alarms are based on smoke detection. Nevertheless, in some fire scenarios volatiles are released before smoke. Fire detectors based only on chemical sensors have already been proposed as they may provide faster response, but they are still prone to false alarms in the presence of nuisances. These systems rely heavily on pattern recognition techniques to discriminate fires from nuisances...
This article deals with the problems connected with the camera calibration techniques applied on a projectile velocity measurement using the single camera photogrammetry. The two methods of a camera calibration are compared. Furthermore, the results obtained using the camera measuring system are compared with the results using the classical ballistic measuring system of the third generation, the optical...
The relative radiometric calibration is essential to get high-quality remote sensing images. An efficient way to bypass the quest of uniformity is to use the satellite agility in order to align the ground projection of the scanline on the ground velocity. This weird viewing principle(side-slither) allows all the detectors to view the same landscape. A relative radiometric calibration model based on...
Generally, an Adaptative Antenna System (AAS) controls the beam shape and steering. AAS's tasks are essentially to find the direction of an emitter and to reduce sidelobe levels of the antenna pattern in the direction of interferences. AAS finds application in radars [1] and in mobile or wireless indoor communications [2]. The AAS contains coherent receivers giving relative phase and magnitude and...
Although the LPDDR4 interface has enabled industry requirements, such as low power consumption and high bandwidth, additional evolution of the current LPDDR4 performance is expected. To respond to the need for more power efficient devices with higher bandwidth, a 2nd generation LPDDR4 (referred to as LPDDR4X), with extreme low power and extended performance, has been developed in this work. In the...
This paper presents an in-situ detector characterization and calibration method for differential I/Q Six-port radar systems. A separate calibration of the nonlinear detectors and the remaining linear RF front-end enables an independent analysis of errors caused by detector nonlinearity and by the measurement scenario. A linearity analysis of various detectors in Six-port radar systems shows the necessity...
The analysis of modern techniques used for automatic measurements in microwaves is given in the paper. The advantages and drawbacks of two mainstream automatic network analyzers are discussed. The conventional measuring technique based on vector voltmeter (VV) is very accurate, so it is taken as a basis of almost all commercially available meters. However, it is based on the frequency down conversion;...
This is a survey paper done on all the methods which are trying to measure oxygen saturation of the fetus using PPG signal non invasively. Lack of oxygen in the baby's blood can result in brain damage and, in the worst cases, death. Although every unborn child has a reserve supply of oxygen (oxygen margin of safety) to draw upon during labor, exactly how large a margin and how long it lasts is unknown...
We propose a multiscale extension of a well-known line segment detector, LSD. We show that its multiscale nature makes it much less prone to over-segmentation, more robust to low contrast and less sensitive to noise, while keeping the parameterless advantage of LSD and still being fast. Moreover, we show that in scenes with little or no feature points, but where it is however possible to perform structure...
This paper presents a time-interleaved (TI) successive-approximation-register (SAR) ADC with a fast variance-based timing-skew calibration technique. It uses a single comparator-based window detector to calibrate the timing skew. It has low-hardware cost and 104 times faster convergence speed compared to prior variance-based timing skew calibration technique. The proposed technique brings collateral...
We explore the possibility of the phase object calibration in schlieren imaging with a diffractive optical element. The light source passing through the diffractive optical element forms dotted pattern at the screen. These rays are refracted by the schlieren sample which is placed in front of the screen. The refracted and original pattern are captured by using charge coupled device (CCD) camera and...
Accurate estimation of distortion-free spectrum is important but difficult in various applications including spectral CT systems. To reconstruct the incident spectrum, there are two key problems to solve. One is the acquisition of detector response function. Different from many existing methods that either require detailed Mont-Carlo modeling of the detector system, or require monochromatic light...
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.