In this paper, two suboptimum detectors are proposed for coherent radar signal detection in K-distributed clutter. Assuming certain values for several initial moments of clutter amplitude, the characteristic function of the clutter amplitude is approximated by a limited series. Using the Pade approximation, it is then converted to a rational fraction. Thus, the pdf of the clutter amplitude is o...

in this paper, calcium stannate nanoparticles were synthesized by a fast and simple co-precipitation procedure. for casno3 preparation ammonia was used as precipitation agent. the effect of various surfactants such as cationic, anionic and neutral on the morphology of the products was investigated. by changing in ca(sal)2 as a new precursor different morphologies were obtained. ligand as a capp...

abstract background: in vivo measurements of applied dose during radiotherapy treatment, is important to ensure accurate dose delivery to patients. uncertainty in dose delivery should fall within ±5% of the prescribed dose as recommended by icru. assessment of dose for radiotherapy applications performed with various types of detectors. in this study, semiconductor diodes were used which have s...

Optoelectronic is one of the thrust areas for the recent research activity. One of the key components of the optoelectronic family is photo detector to be widely used in broadband communication, optical computing, optical transformer, optical control etc. Present paper includes the investigation. carried on the basis of the. Multiplication measurements on GaAs, InP, InGaAs, GaInP, p+-i-n+s with...

Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample analysis when high-power tunable radiation sources and resonant detectors (PADs) are used. In the PAD, acoustic signal generated by absorbed in measurement chamber is amplified proportionally to Q-factor resonator. But, compact lasers (with power above 100 mW) still not widely spread terahertz spectral ran...

Device and semi-device independent quantum randomness generators (DI- SDI-QRNGs) are crucial for applications requiring private randomness. However, they vulnerable to detection inefficiency attacks this limits severely their usage practical purposes. Here, we present a method protecting SDI-QRNGs in prepare-and-measure scenarios against attacks. The key idea is the introduction of blocking dev...

Infrared photo detectors have vast and promising applications in military,industrial and other fields. In this paper, we present a method for improving theperformance of an infrared photodetector based on an InSb substance. To achieve goodperformance at high temperatures, thermal noise and intrusive currents should bereduced. For this purpose, a five-layer hetero structu...

Abstract Hyper-Kamiokande (Hyper-K) is a next generation underground large water Cherenkov detector. Its tank will be filled with 260000 metric tons of ultra-pure fiducial volume 0.19 Mtons, which about 8 times larger than that its predecessor Super-Kamiokande. In volume, light produced by neutrino interactions and detected newly developed photo sensors installed in dedicated frame. Two differe...

We present an approach to discover novel faces in untagged photo collections by leveraging the “social context” of co-occurring people. Our idea exploits the social nature of consumer photos, in which people of the same clique (family, team, class, friends) often appear together. Initially, the system trains detectors for any individuals with tagged instances in the collection. Then, for each u...

We propose a new scintillation-type detector in which high-energy radiation generates electron–hole pairs in a direct-gap semiconductor material that subsequently recombine producing infrared light to be registered by a photo-detector. The key issue is how to make the semiconductor essentially transparent to its own infrared light, so that photons generated deep inside the semiconductor could r...