Spacecraft design project: High latitude communications satellite

The spacecraft design project was part of AE-4871, Advanced Spacecraft Design. The project was intended to provide experience in the design of all major components of a satellite. Each member of the class was given primary responsibility for a subsystem or design support function. Support was requested from the Naval Research Laboratory to augment the Naval Postgraduate School faculty. Analysis and design of each subsystem was done to the extent possible within the constraints of an eleven week quarter and the design facilities (hardware and software) available. The project team chose to evaluate the design of a high latitude communications satellite as representative of the design issues and tradeoffs necessary for a wide range of satellites. The High-Latitude Communications Satellite (HILACS) will provide a continuous UHF communications link between stations located north of the region covered by geosynchronous communications satellites, i.e., the area above approximately 60 N latitude. HILACS will also provide a communications link to stations below 60 N via a relay Net Control Station (NCS), which is located with access to both the HILACS and geosynchronous communications satellites. The communications payload will operate only for that portion of the orbit necessary to provide specified coverage

Evaluation of ferroelectric materials for memory applications

Ferroelectric materials have wide application in area such as piezoelectric transducers, pyroelectric detectors, and electro-optics, and now thin-film ferroelectric materials are being integrated with conventional semiconductor processes to produce memory devices. Memories based on this technology potentially offer nonvolatile data storage and extended read-write endurance in comparison with EEPROMs, without speed or power penalties. These memories are also radiation hard. Considerable interest in ferroelectric memory exists in the Department of Defense (DOD) because of these characteristics. However, several problems remain unsolved and no memory devices have been produced as yet. The physical mechanisms (as they are understood) are discussed, the claims made for the technology are examined, and the potential roadblocks, such as: cycle dependent fatigue, time dependent degradation of memory retention, and fabrication problems are evaluated.http://archive.org/details/evaluationofferr1094527767Commander, United States NavyApproved for public release; distribution is unlimited

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Establishment and utility of SwedAD : a nationwide Swedish registry for patients with atopic dermatitis receiving systemic pharmacotherapy

SwedAD, a Swedish nationwide registry for patients with atopic dermatitis receiving systemic pharmacotherapy, was launched on 1 September 2019. We describe here the establishment of a user-friendly registry to the benefit of patients with atopic dermatitis. By 5 November 2022, 38 clinics had recorded 931 treatment episodes in 850 patients with an approximate national coverage rate of 40%. Characteristics at enrolment included median Eczema Area and Severity Index (EASI) 10.2 (interquartile range 4.0, 19.4), Patient-Oriented Eczema Measure (POEM) 18.0 (10.0, 24.0), Dermatology Life Quality Index (DLQI) 11.0 (5.0, 19.0) and Peak Itch Numerical Rating Scale-11 (NRS-11) 6.0 (3.0, 8.0). At 3 months, median EASI was 3.2 (1.0, 7.3) and POEM, DLQI, and NRS-11 were improved. Regional coverage varied, reflecting the distribution of dermatologists, the ratio of public to private healthcare, and difficulties in recruiting certain clinics. This study highlights the importance of a nationwide registry when managing systemic pharmacotherapy of atopic dermatitis