Introduction Conclusions References Tables Figures

We use the ROSAT North Ecliptic Pole (NEP) survey to construct a small, but purely X-ray flux-limited sample of cataclysmic variable stars (CVs). The sample includes only four systems, two of which (RX J1715.6+6856 and RX J1831.7+6511) are new discoveries. We present time-resolved spectroscopy of the new CVs and measure orbital periods of 1.64 ± 0.02 and 4.01 ± 0.03 h for RX J1715.6+6856 and RX...

This paper examines Hispanic voting behavior in the 2004 Presidential election. Our research makes a significant contribution to the literature on Hispanic politics, as this is the first study to apply theories of issue and economic voting to a nationwide sample of Hispanic voters. We demonstrate that, similar to Anglos, issues and ideology were highly influential in the vote choice of Hispanic...

Communication networks shared by selfish users are considered and modeled as noncooperative repeated games. Each user is interested only in optimizing its own performance by controlling the routing of its load. We investigate the existence of a Nash equilibrium point (NEP) that achieves the system-wide optimum cost. The existence of a subgame-perfect NEP that not only achieves the system-wide o...

Our global society is becoming increasingly aware of the way the climate is changing worldwide and the consequences that will result from those changes. An individual's level of concern for the environment will likely affect how willing they are to engage in and support behaviors that aim to preserve the natural world. This study aimed to determine how local environmental literacy, degree progr...

ABSTRACT A novel concept of the Cold-Electron Bolometer (CEB) with strong electrothermal feedback has been proposed. The concept is based on direct electron cooling of the absorber that serves as negative electrothermal feedback for incoming signal. This feedback is analogous to TES (transition-edge sensor) but additional dc heating is replaced by deep electron cooling to minimum temperature. I...

Time of flight laser range finding, scanning video imaging and deep space communications are three applications requiring very low noise optical receivers in order to achieve detection of fast and weak optical signal. Avalanche photodiode is the detector of choice for its high quantum efficiency, compact size and reduced electronics complexity. Optimal operating condition in terms of gain and t...

We present terahertz (THz) detectors based on top-gated graphene field effect transistors (GFETs) with integrated split bow-tie antennas. The GFETs were fabricated using graphene grown by chemical vapor deposition (CVD). The THz detectors are capable of room-temperature rectification of a 0.6 THz signal and achieve a maximum optical responsivity better than 14 V/W and minimum optical noise-equi...

High-performance megapixel focal plane arrays with small pixels have been widely used in modern optical remote sensing, astronomical, and surveillance instruments. In the prediction models applied traditional instrument performance analysis, image of a point source is assumed to fall on center detector pixel. A geometrical realistic system may actually any position pixel because sensor’s line s...

This paper presents the design and characterization of zero bias power detectors, based on MOSFET transistors, integrated in SiGe 55-nm BiCMOS technology from ST-Microelectronics. The working frequency bands circuits are located range (38–55) GHz, dedicated to optimize consumption 5G devices. Three NMOS categories available used (GP, LP, HPA), aim is several detectors different order compare th...