We present a spectrophotometric calibration system that will be implemented as part of the DES DECam project at the Blanco 4 meter at CTIO. Our calibration system uses a 2nm wide tunable source to measure the instrumental response function of the telescope from 300nm up to 1100nm. The system consists of a monochromator based tunable light source that is projected uniformly on a Lambertian scree...

We present a method by using the phase characteristics of radio observation data for pulsar search and candidate identification. The are relations between signal correction in frequency-domain, we regard it as new diagnostic characteristic. Based on characteristics, is presented: calculating DM (dispersion measure) -- frequency to select frequencies, then confirming candidates broadband signals...

Self-configuring wireless sensor networks are a fascinating emerging technology: the vision is to spread out hundreds or thousands of small, cheap, battery-driven, and self-configuring nodes bearing a wireless modem to accomplish a given task jointly. An important concern is the network lifetime: as nodes run out of power, the connectivity decreases and the network can finally be partitioned an...

Misinterpretation of uncertainty in the measurement of the electromagnetic field (EMF) strength may lead to an underestimation of exposure risk or an overestimation of required measurements. The Guide to the Expression of Uncertainty in Measurement (GUM) has internationally been adopted as a de facto standard for uncertainty assessment. However, analyses under such an approach commonly assume u...

Optical and near-infrared observations of the GRB990705 error box were carried out with ESO telescopes at La Silla and Paranal in Chile and with the NOAO SPIREX 0.6-meter telescope in Antarctica. We detected the counterpart of this GRB in the near-infrared H band and optical V band. The power-law decline of the near-infrared lightcurve is rather steep with a decay index α ' 1.7 in the first hou...

In order to expand the astrophysical reach of gravitational wave detectors, several interferometer topologies have been proposed, in the past, to evade the thermodynamic and quantum mechanical limits in future detectors. In this work, we make a systematic comparison among these topologies by considering their sensitivities and complexities. We numerically optimize their sensitivities by introdu...

AbstractBridging and Transmission of VDSL2 broadband over power lines has received considerable attention recently to cater to broadband distribution within the premises of a residence. Power lines are fundamentally different from telephone lines both in topology and load impedance. Power lines have a thicker gauge and shorter straight lengths, apart from a large number of bridge taps (BT) with...

A real-time array feed compensation system has been constructed, and is currently undergoing tests at JPL. This sytem was designed to operate at h-band (33.7 GHz) carrier frequencies, where mechanical distortions begin to seriously degrade the performance of large DSN antennas. A compact cluster of seven 22 dBi horns in the focal-plane of a 34-meter beam-waveguide antenna sample the distorted f...

We report on our experience in telementoring during laparoscopic adrenalectomy. An experienced laparoscopic surgeon supervised a less experienced surgeon from a control room about 100 meter away. Mentoring was accomplished over a fiber optic cable employing real-time video imaging, two-way audio communication, OES ImageTrac Video System used to control the laparoscopic image, and a telestrator....

Power line communication (PLC) has become an important network access technology to conveniently and effectively provide various useful services such as remote meter reading, broadband Internet access, and home networking services. As the deployment and use of PLC networks increase, it is essential that we need to be able to configure, monitor, and control the PLC network resources. In this pap...