Raytheon

About: Raytheon is a company organization based out in Waltham, Massachusetts, United States. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 15290 authors who have published 18973 publications receiving 300052 citations.

The association of pretreatment health-related quality of life with surgical complications for patients undergoing open surgical resection for colorectal cancer.

Abstract: OBJECTIVE The purpose of this study was to define the association between pretreatment health-related quality of life (HRQL) and surgical complications for patients with colorectal cancer. SUMMARY BACKGROUND DATA For patients with colorectal cancer, surgical complications arise from an interaction between underlying medical comorbidity, colorectal cancer severity, and quality and type of treatment provided. Measurement of HRQL provides a summarization of well-being in the context of medical comorbidity and colorectal cancer severity. The summarization of these factors may be useful in prospective risk assessment of patients about to undergo surgery for colorectal cancer. METHODS A single-institution, prospective, cohort study of patients with colorectal adenocarcinoma was performed from August 1, 1999, to March 31, 2002. Before treatment, all participants completed Medical Outcomes Survey SF-36 (SF-36); after the first year of the study, patients also completed the colorectal cancer module of the Functional Assessment of Cancer Therapy survey (FACT-C). Information was collected on demographics, treatment, tumor variables, and complications. RESULTS Ninety-seven patients have undergone open resection of their colorectal cancer. All patients completed SF-36; 65 completed FACT-C. Thirty patients (31%) experienced complications, including 4 (4%) deaths. Age, race, albumin level, American Society of Anesthesia class, specialty surgical training, tumor location, and stage were not associated with complications in univariate analysis. Patients experiencing surgical complications had significantly lower HRQL scores on SF-36 Social Functioning, General Health Perception, and Mental Health Index scales as well as the Mental Health Component summary score. FACT-C Social/Family, Emotional, Functional Well-Being scores, and the Colorectal Cancer Concerns score were also significantly lower for patients sustaining complications. When these HRQL scales were examined in a multivariate model including albumin level, tumor location, and ASA class, SF-36 Social Functioning (Odds Ratio [OR] = 0.98; 95% Confidence Interval [CI] = 0.97-0.99) and FACT-C Colorectal Cancer Concerns (OR = 0.89; 95% CI = 0.79-0.99) scales retained a significant association with complications. CONCLUSIONS Pretreatment HRQL scores as measured by several scales of SF-36 and FACT-C were significantly associated with complications. Future studies should concentrate on defining the predictive role of HRQL in determining surgical outcome for patients with colorectal cancer.

Demonstration of 4H-SiC UV single photon counting avalanche photodiode

Abstract: The first 4H-SiC UV single photon counting avalanche photodiode has been designed, fabricated and characterised. Spectral quantum efficiency from 250 to 370 nm is presented. Single photon counting at room temperature is demonstrated for the first time and counting efficiency is reported.

Pattern characteristics of harmonic and intermodulation products in broadband active transmit arrays

Abstract: A three-term power series model for the nonlinearity in the power amplifiers of an active array is used to explore the radiation characteristics of the harmonics and intermodulation products. This model leads to simple equations for predicting the beam-pointing direction and the aperture amplitude taper of the spurious signals. Cases of a single transmit signal, dual transmit signals within a single beam and dual beam operations are analyzed. This model shows that the second and third harmonics are co-boresighted with the fundamental signal but have squared and cubed aperture amplitude distributions. The third-order intermodulation products in general have beam-pointing directions offset from the fundamental signal beam(s). Graphical methods of locating the intermodulation beams in (u, v) space are outlined and illustrated by example.

Passive conductive cooling module

Abstract: A cooling module includes a thermally conductive plate, a bladder disposed on at least one side of the plate, the bladder have a chamber, and fluid disposed in the chamber of the bladder wherein the bladder in an inflated state impresses the cooling module against an adjacent electronic circuit card. where the cooling module is forcibly pressed against adjacent electronic circuit card providing increased physical stability to the electronic circuit card as well as provide a cooling technique for the circuit card.

Dielectric flare notch radiator with separate transmit and receive ports

Abstract: A dielectric antipodal flared notch radiator (50) with separate transmit and receive ports (72,76) for phased array and active array antennas. A circulator (80) is integrated directly to the broadside coupled-strip transmission line portions (78,88) of the antipodal flared notch radiator without the use of baluns. The look-in impedance of the radiator element is improved as a result of the circulator and lack of a balun. By sandwiching the antipodal flared notch between two additional layers of dielectric (54,56), the device can be made a building block for broadband active array antennas.