The effects of the geosynchronous energetic particle radiation environment on spacecraft charging phenomena

The energetic electron environment at the geosynchronous orbit is responsible for a variety of adverse charging effects on spacecraft components. The most serious of these is the degradation and failure of a complementary-metal-oxide-semiconductor (CMOS) electronic components as a result of internal charge-buildup induced by the energetic electrons. Efforts to accurately determine the expected lifetime of these components in this orbit are hampered by the lack of detailed knowledge of the electron spectrum and intensity, particularly of the more penetrating energies greater than 1.5 MeV. This problem is illustrated through the calculation of the dose received by a CMOS device from the energetic electrons and associated bremsstrahlung as a function of aluminum shielding thickness using the NASA AE-6 and the Aerospace measured electron environments. Two computational codes which were found to be in good agreement were used to perform the calculations. For a given shielding thickness the dose received with the two radiation environments differ by as much as a factor of seven with a corresponding variation in lifetime of the CMOS

Analysis of high resolution satellite data for cosmic gamma ray bursts

Cosmic gamma ray bursts detected a germanium spectrometer on the low altitude satellite 1972-076B were surveyed. Several bursts with durations ranging from approximately 0.032 to 15 seconds were found and are tabulated. The frequency of occurrence/intensity distribution of these events was compared with the S to the -3/2 power curve of confirmed events. The longer duration events fall above the S to the -3/2 power curve of confirmed events, suggesting they are perhaps not all true cosmic gamma-ray bursts. The narrow duration events fall closely on the S to the -3/2 power curve. The survey also revealed several counting rate spikes, with durations comparable to confirmed gamma-ray bursts, which were shown to be of magnetospheric origin. Confirmation that energetic electrons were responsible for these bursts was achieved from analysis of all data from the complete payload of gamma-ray and energetic particle detectors on board the satellite. The analyses also revealed that the narrowness of the spikes was primarily spatial rather than temporal in character

Detailed analysis of radiation data from the Gemini 4 and Gemini 7 proton-electron spectrometer experiments Final report, 13 Jun. 1967 - 30 Dec. 1968

Detailed analysis of radiation data from Gemini 4 and 7 proton-electron spectrometer experiment

Continuous Infusion of Escalated Doses of Amphotericin B Deoxycholate: An Open-Label Observational Study

Amphotericin B deoxycholate (AmB-d) remains a mainstay of antifungal therapy for immunocompromised patients, despite being associated with significant therapy-related toxicity. Because continuous infusion of AmB-d is better tolerated than traditional administration over 2-6 hours, we evaluated escalation of the AmB-d dose in 33 patients (31 of whom were neutropenic), for whom the initial dosage of AmB-d (1 mg/kg/day) was gradually increased to 2.0 mg/kg/day when renal function remained stable and the drug was tolerated. Dose escalation was possible without delay in 28 patients. Median duration of AmB-d therapy was 16 days (range, 7-72 days). Infusion-related reactions accompanied 2-fold decrease in creatine clearance was observed in 5 patients, and the decrease was dose-limiting in only 1 patient; no dialysis was required. In conclusion, continuous infusion of AmB-d escalated to 2.0 mg/kg/day seems not to cause additional impairment of vital organ functions and to be well tolerated by most patient

Compliance with the surgical safety checklist in Switzerland: an observational multicenter study based on self-reported data.

BACKGROUND Since publication of the surgical safety checklist by the WHO in 2009, it has been introduced in many hospitals. However, frequency and quality of surgical safety checklist use is often low probably limiting the effectiveness of the checklist in preventing patient harm. The focus of this study was to examine the current state of compliance with the surgical safety checklist in Switzerland and to evaluate how the data relates to international comparative data. METHODS Between November 2020 and March 2021 twelve hospitals with 15 sites collected for at least 200 surgical interventions each whether the three sections of the surgical safety checklist (Sign In, Team Time Out, Sign Out) have been applied. This data collection was part of a large quality improvement project focusing on measuring and improving compliance with the surgical safety checklist via peer observation and feedback. Descriptive statistics were used to analyze the data; chi-square tests were used to compare sub-samples. RESULTS The hospitals collected valid compliance data for 8622 surgical interventions. Mean compliance rate was 91% when distinguishing between the two categories applied (including partially applied) and not applied. In line with previous research, Sign In (93%) and Team Time Out (94%) sections have been applied more frequently than Sign Out (86%). All three surgical safety checklist sections have been applied in 79% of the surgical interventions, no sections in 1%. CONCLUSIONS The results of this study indicate that the overall application of the surgical safety checklist in Switzerland can be considered high, although the completeness, especially of the Sign Out section, could be improved. At present, it seems difficult to compare compliance rates from different studies as measurement methods and definitions of compliance vary widely. A systematization and homogenization of the methodology within, but also beyond, national borders is desirable for the future