Booster Obsolescence and Life Extension (BOLE) for Space Launch System (SLS)

A human mission to the moon and Mars is the stated space exploration goal of the United States and the international community. To achieve these goals, NASA is developing the Space Launch System (SLS) and the Orion crew capsule as key elements in the architecture for missions to the moon and Mars. As part of the SLS Booster Obsolescence and Life Extension (BOLE) program, Northrop Grumman Space Systems is working to address booster obsolescence issues in design and manufacturing. The upgraded boosters will also provide increased performance that will benefit future lunar campaigns, science missions, and the eventual Mars campaign

A Cost-Effective Method for Applying and Removing Bird-Exclusion Netting in Commercial Vineyards

Bird-exclusion netting can be highly effective for reducing bird damage to agricultural crops, but the high cost of materials and perceived difficulty of applying and removing it has discouraged many growers from using this technique. The expectation of extensive damage to a high-value crop may warrant the implementation of costly protection measures such as bird-exclusion netting. During 1987, we evaluated a method for applying and removing bird-exclusion netting in 4 commercial vineyards on the North Fork of Long Island, New York. The method involved altering a hydraulically-operated, front-end bucket-loader to accommodate loading and applying 5.2-m-wide nets directly over rows of grape vines. Applying the netting, including loading and unloading the rolls of netting, required an average of 2.5 hr/ha for 3 people. Removal required an average of 2.8 hr/ha for 3 people. The single largest cost was the price of the netting, which accounted for approximately 70-74% of the total cost of the program. Four growers have used the netting for 5 seasons with minimal damage and anticipate using the netting for at least 1 additional season. The total cost of modifying the tractor and purchasing, applying, and removing the netting, based on an estimated net life of 5 yr, was $509-$534/ha/yr. Assuming that the netting is 95% effective in preventing bird depredations, it provides cost-effective protection in vineyards where high levels of damage ( \u3e 6%) are anticipated. However, the netting may not be practical in small vineyards or where low levels of damage are expected. An increasing number of vineyard managers on Long Island are using bird-exclusion netting to protect their vineyards from birds

Designing Interfaces with Social Presence: Using Vividness and Extraversion to Create Social Recommendation Agents

Interfaces now employ a variety of media-rich, social, and advanced decision-making components, including recommendation agents (RA) designed to assist users with their tasks. Social presence has been identified as a key consideration in website design to overcome the lack of warmth, social cues, and face-to-face interaction, but few studies have investigated the interface features that may increase social presence. Recent research on RAs has similarly acknowledged social presence as a key factor in the design of online RAs and in building trust in this technology, but there has been limited empirical work on the topic. In this study an experiment was conducted to explore how social technology cues, media capabilities, and individual differences influence social presence and trust in an RA. RA personality (extraversion), vividness (text, voice, and animation), and computer playfulness were found to influence social presence, with social presence serving in a mediating role and increasing user trust in the RA. Vividness also had a moderating effect on the relationship between RA extraversion and social presence such that increased levels of vividness strengthen this relationship

A Look at How Levels of Vividness and Social Presence Affect Trust in a Decision Aid

Building on past research on trust and social presence, this study explores how multimedia vividness and social presence affect trusting beliefs and subsequently trusting intentions of a computer-based decision aid. An experiment involving 550 subjects examines the effect that decision aid personality and increased levels of vividness (text, voice, and animation) have on social presence, and downstream trust-related constructs including trusting beliefs and trusting intentions. The effect of a user’s computer playfulness on social presence is also investigated. Past research on trust and social presence provide the theoretical foundation for the study and suggest that increased vividness may moderate the effect of decision aid personality on perceptions of social presence, with social presence consequently affecting trusting beliefs

Booster Obsolescence and Life Extension (BOLE) for Space Launch System (SLS)

A human mission to the moon and Mars is the stated space exploration goal of the United States and the international community. To achieve these goals, NASA is developing the Space Launch System (SLS) and the Orion crew capsule as key elements in the architecture for missions to the moon and Mars. As part of the SLS Booster Obsolescence and Life Extension (BOLE) program, Northrop Grumman Innovation Systems is working to address booster obsolescence issues in design and manufacturing. The upgraded boosters will also provide increased performance that will benefit future lunar campaigns, science missions, and the eventual Mars campaign

The Influence of Motion and Stress on Optical Fibers

We report on extensive testing carried out on the optical fibers for the VIRUS instrument. The primary result of this work explores how 10+ years of simulated wear on a VIRUS fiber bundle affects both transmission and focal ratio degradation (FRD) of the optical fibers. During the accelerated lifetime tests we continuously monitored the fibers for signs of FRD. We find that transient FRD events were common during the portions of the tests when motion was at telescope slew rates, but dropped to negligible levels during rates of motion typical for science observation. Tests of fiber transmission and FRD conducted both before and after the lifetime tests reveal that while transmission values do not change over the 10+ years of simulated wear, a clear increase in FRD is seen in all 18 fibers tested. This increase in FRD is likely due to microfractures that develop over time from repeated flexure of the fiber bundle, and stands in contrast to the transient FRD events that stem from localized stress and subsequent modal diffusion of light within the fibers. There was no measurable wavelength dependence on the increase in FRD over 350 nm to 600 nm. We also report on bend radius tests conducted on individual fibers and find the 266 microns VIRUS fibers to be immune to bending-induced FRD at bend radii of R > 10cm. Below this bend radius FRD increases slightly with decreasing radius. Lastly, we give details of a degradation seen in the fiber bundle currently deployed on the Mitchell Spectrograph (formally VIRUS-P) at McDonald Observatory. The degradation is shown to be caused by a localized shear in a select number of optical fibers that leads to an explosive form of FRD. In a few fibers, the overall transmission loss through the instrument can exceed 80%.Comment: 19 pages, 22 figure

Intra-articular Injection Administration in UK Ex-professional Footballers During Their Playing Careers and the Association with Post-career Knee Osteoarthritis

© 2020, The Author(s). Background: The long-term risk from knee intra-articular (KIA) injections in professional athletes such as ex-footballers remains unknown. The use of KIA injections is controversial and remains anecdotally prolific as it is perceived as being safe/beneficial. The aim of this study was to determine the number, type and frequency KIA injections administered to retired professional footballers during their playing careers and the associations with post-career knee osteoarthritis (KOA). Methods: This is a cross-sectional study involving a postal questionnaire (n = 1207) and subsequent knee radiographs in a random sample of questionnaire responders (n = 470). Footballers self-reported in the questionnaire whether they had received KIA injections and the estimated total number over the course of their playing career. Participant characteristics and football career-related details were also recorded. KOA was measured as self-reported knee pain (KP), total knee replacement (TKR) and radiographic KOA (RKOA). Results: 44.5% of footballers had received at least one KIA injection (mean: 7.5; SD ± 11.2) during their professional career. 71% of knee injections were cortisone/corticosteroid based. Multivariate logistic regression, adjusting for age, body mass index (BMI) and significant knee injury identified that footballers with injections weretwo times more likely to have KP (OR 1.81, 95% CI 1.40–2.34) and TKR (OR 2.21, 95% CI 1.43–3.42) than those without injections. However, there was no association with RKOA (OR 1.30, 95% CI 0.85–2.01). Given, the association with KP and TKR, we found a significant dose–response relationship as the more injections a player received (by dose–response groups), the greater the risk of KP and TKR outcomes after adjustment for knee injury and other confounders (p for trend < 0.01). Conclusion: On average, 8 KIA injections were given to the ex-footballers during their professional career. The most commonly administered injections were cortisone based. These injections associated with KP and TKR after they retired. The associations are independent of knee injuries and are dose dependent. The study suggests that there may have been excessive use of KIA injections to expedite return to play and this contributed to detrimental long-term outcomes such as KP and TKR post-retirement from professional football