The SELEX experiment (E781) is 3-stage magnetic spectrometer for a high statistics study of hadroproduction of charm baryons out to large xF using 650 Gev Σ , π and p beams. The main features of the spectrometer are: a high precision silicon vertex system, powerful particle identification provided by TRD and RICH, forward Λs decay spectrometer and 3-stage lead glass photon detector. An experime...

Chemometrics was employed to develop models that utilize infrared spectral measurements to estimate the concentrations of key analytes in tomatoes that determine quality. Models constructed using the handheld Agilent 4200 FlexScan FTIR spectrometer gave results comparable to those obtained using a benchtop spectrometer. The 4200 FlexScan spectrometer thus provides the ability to accurately asse...

Chemometrics was employed to develop models that utilize infrared spectral measurements to estimate the concentrations of key analytes in tomatoes that determine quality. Models constructed using the handheld Agilent 4200 FlexScan FTIR spectrometer gave results comparable to those obtained using a benchtop spectrometer. The 4200 FlexScan spectrometer thus provides the ability to accurately asse...

We describe the technological concept and the first–light results of a 1024-channel spectrometer based on field programmable gate array (FPGA) hardware. This spectrometer is the prototype for the seven beam L-band receiver to be installed at the Effelsberg 100-m telescope in autumn 2005. Using " of-the-shelf " hardware and software products, we designed and constructed an extremely flexible Fas...

We demonstrate a new kind of optical spectrometer employing photonic crystal patterns to outcouple waveguided light from a transparent substrate. This spectrometer consists of an array of photonic crystal patterns, nanofabricated in a polymer on a glass substrate, combined with a camera. The camera captures an image of the light outcoupled from the patterned substrate; the array of patterns pro...

Visible afterglow counterparts have now been detected for two GRBs (970228 and 970508) but are absent, with Lopt/Lγ ratios at least two orders of magnitude lower, for other GRBs, e.g., 970828. The causes of this variation are unknown. Any correspondence which could be discovered between the γ-ray properties of a GRB and its Lopt/Lγ would be useful, both in determining the GRB mechanisms, and in...

Distortion inherent to a previously described system for acquisition of two-dimensional monochromatic spatial images is described. A solution is offered in the form of an improved instrument. The system uses a Czerny-Turner monochromator for spectral discrimination and a charge-coupled device (CCD) as the detector. A second Czerny-Turner monochromator, with identical dimensions, is added to cor...

After initial checks, I noticed egregious differences between the apparatus as I found it and earlier literature. A thorough investigation then ensued to establish a new calibration factor (and to uncover when the calibration factor changed). The rest of this document details these measurements, but the final conclusion of this work is to find that the beam momentum relates to the spectrometer ...

Continuous analysis of oxygen and carbon dioxide tension in the blood phase, over periods of 4-5 h, was carried out in the pulmonary artery (93 determinations in six anesthetized dogs) and in the aorta (29 determinations in four anaesthetized dogs). Silastic-covered stainless steel catheters attached to a mass spectrometer were used. The mass spectrometer signals were linearly related to the bl...

A novel design for a compact gamma-ray spectrometer is presented. The proposed system allows for spectroscopy of high-flux multi-MeV gamma-ray beams with MeV energy resolution in a compact design. In its basic configuration, the spectrometer exploits conversion of gamma-rays into electrons via Compton scattering in a low-Z material. The scattered electron population is then spectrally resolved ...