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.
Accurate quantification of gamma-ray source activity using CdZnTe-based imaging systems requires compensation of sensitivity loss mechanisms specific to large volume, pixelated CdZnTe detectors. Current sensitivity estimation methods are based on simulation, but the effects that reduce sensitivity are difficult to model and vary with detector-specific electric field profiles. A new, empirical method...
Gamma-ray imaging allows for efficient detection, characterization, and localization of compact radioactive sources in cluttered environments. Fieldable detector systems employing active planar coded masks demonstrate broad energy sensitivity via both coded aperture and Compton imaging modalities. Because planar configurations suffer from a limited field-of-view, we introduce a novel design by rearranging...
The next generation of organ specific Positron Emission Tomography (PET) scanners, e.g. for breast imaging, will use partial ring geometries. We propose a component-based Maximum-Likelihood (ML) estimation of normalisation factors for 3D PET data reconstruction applicable to partial ring geometries. This method is based on the Software for Tomographic Image Reconstruction (STIR) for full ring PET...
Within the German Plant Phenotyping Network (DPPN), we developed a novel PET scanner based on Philips Digital Photon Counters (DPCs, or dSiPMs = digital Silicon Photomultipliers). The scanner is dedicated for plant research and provides functional information on carbon transport within the plant. To this end the detector ring is oriented horizontally. It provides a Field-of-View of 18 cm dia. and...
Silicon carbide is well known as a radiation hard semiconductor, that has been demonstrated in a range of detector structures for deployment in application where the ability to tolerate high radiation dose is imperative. This includes applications in space and nuclear environments, where the ability to detect highly energetic radiation is important. In contrast, medical treatment uses a range of radiation...
The aim of the COBRA experiment is to search for the existence of neutrinoless double beta-decay (0nββ-decay) with CZT semiconductor detectors. One key instrument to reach the required half-life sensitivity of several 1026 years is to differentiate between signal and background events. The 0nββ-signal is expected to be almost always a single-site event (SSE) within only one detector. Hence, all multi-site...
We consider the special treatment of the gamma-ray images obtained by a portable gamma cameras with detector Medipix. The processing of gamma images was conducted to improve the angular resolution using the developed iterative method. The elimination of muon tracks in the shadow patterns to increase the sensitivity was considered also.
The MEG II experiment is an upgrade of the MEG experiment to search for the charged lepton flavor violating decay of muon, μ → e γ. The MEG II experiment is expected to reach a branching ratio sensitivity of 4 × 10”14, which is one order of magnitude better than the sensitivity of the MEG experiment. The performance of the liquid xenon (LXe) γ-ray detector will be greatly improved with a highly granular...
Distributed Denial of Service (DDoS) is one kind of attacks using multiple computers. An attacker would act as a fake service requester that drains resources in computer target. This makes the target cannot serve the real request service. Thus we need to develop DDoS detector system. The proposed system consists of traffic capture, packet analyzer, and packet displayer. The system utilizes Ntopng...
The complete design and electrical characterization of a readout frontend for high luminosity pixel detectors is hereby presented. The design has been carried out in 28nm bulk-CMOS technology. The selected technology process shows significant advantages in terms of radiation hardness, faster/low-power digital signal processing and whole chip area reduction. Nonetheless, it is challenging in terms...
We report for the first time the application of a hydrogenated, amorphous-Si solar-cell as a self-powered (i.e., no external power) detector for visible-light that we briefly characterized using a 3D-printed microplasma.
A novel label free, compact, fast and noninvasive absorbance based optical sensing technique was devised for the first time to detect cortisol, a physical and psychological stress biomarker, using ultraviolet (UV) LEDs. LEDs at three different UV wavelengths were employed to demonstrate cortisol sensing with different cortisol concentration. From the differential photoresponse versus concentration...
We report on the tuning of the mid-infrared synchrotron radiation toward optimal conditions in nano-FTIR spectroscopy. The electron bunch shape and spectral bandwidth of the emitted radiation are adapted for both strong and temporally stable near-field signal amplitudes.
In the FP7 project CONSORTIS, a dual-band passive imager is being developed for security applications. The latter is based on bolometer based kinetic inductance detectors operating at two frequency bands to improve the collection of thermal information. These bolometric detectors rely on a frequency selective absorber (FSA) to achieve the two bands. In this contribution, we describe the optimization...
We propose electrical THz detection based on topological insulators which have Dirac electrons. Among them, multi-layered topological insulator system is expected to stack topological interface states and hence enhancement of photo absorption is likely to be realized. GeTe/Sb2Te3 interfacial phase change memory materials (iPCM) were used and THz-induced electrical response was measured. As a result,...
This paper presents a low power high sensitivity RF power detector (PD) for multi-mode active tags. To achieve low power consumption and large detection range, two-branch common-source-type MOSFET transistors biased in subthreshold region are used. This power detector produces the mode-enabled signals to the multi-mode active tag according to the different received RF power. Therefore, the multi-mode...
A charge preamplifier has been developed in a 65 nm CMOS technology for processing the signal from the inner pixel layers of the CMS detector, in view of the experiment upgrade for the High Luminosity (HL) LHC. The circuit is part of a readout channel implementing a time-over-threshold method for analog-to digital-conversion of the charge signal. Samples of the circuit have been exposed to high doses...
Test procedures and on-site diagnostics of high voltage power cables are one of the main problems of asset management carried-out by power utility companies. It is obvious that cable lines are very important components of the transmission network. So it is very significant to check the initial condition of cables carrying-out after-lying tests, as well as routine test performed in time of normal operation,...
Short-lasting rhythmic activity in intracranial electroencephalogram (iEEG) in the frequency range of 80 to 500 Hz is regarded to be a promising biomarker of epileptogenicity. This activity is referred to as high-frequency oscillation (HFO), and its detection from iEEG is considered the first step to several applications. In this study, several multi-channel algorithms for HFO detection are proposed...
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.