Semiclassical transition probabilities by an asymptotic evaluation of the S matrix for elastic and inelastic collisions. Bessel uniform approximation

It has been observed in the past that the usual Airy uniform approximation gives probabilities greater than one, especially for near elastic collisions. By mapping the phase onto −ζ cos y + ky + A rather than (1∕3)y^3 − ζy + A one obtains a uniform approximation involving Bessel functions of the first kind, which approaches unity for the elastic collision. This Bessel uniform approximation is no more complicated than the Airy and also gives good agreement with exact quantum results, even if probabilities are large

Electric arc apparatus Patent

Electric arc heater with supersonic nozzle and fixed arc length for use in high temperature wind tunnel

Narratives of Loss

My research revolves around impermanence, loss, and the grief that accompanies loss. My thesis work consists of digital collages interlaced with short stories, an interactive digital media piece, traditionally-made collages, a picture book, art objects, and an assortment of other supporting work. My ultimate aim is to employ both traditional techniques and digital skills to create visual narratives that supply glimpses into my personal history of loss and that speak to life’s brevity

Arctic tree rings as recorders of variations in light availability

Annual growth ring variations in Arctic trees are often used to reconstruct surface temperature. In general, however, the growth of Arctic vegetation is limited both by temperature and light availability, suggesting that variations in atmospheric transmissivity may also influence tree-ring characteristics. Here we show that Arctic tree-ring density is sensitive to changes in light availability across two distinct phenomena: explosive volcanic eruptions (P<0.01) and the recent epoch of global dimming (P<0.01). In each case, the greatest response is found in the most light-limited regions of the Arctic. Essentially no late 20th century decline in tree-ring density relative to temperature is seen in the least light-limited regions of the Arctic. Consistent results follow from analysis of tree-ring width and from individually analysing each of seven tree species. Light availability thus appears an important control, opening the possibility for using tree rings to reconstruct historical changes in surface light intensity

Lung Cancer Survivors Who Continue Smoking After Diagnosis Are More Likely to be Living with an Individual Who Smokes

Abstract Introduction: In the United States, lung cancer is the leading cause of cancer death in both men and women. Smoking increases the risk for lung cancer, and smoking cessation after diagnosis improves cancer survival and lowers rates of recurrence. Using the Theory of Planned Behavior (TPB), we examined individual attitudes, perceived control, and subjective norms as predictors of lung cancer survivors’ intention to quit smoking. Method: We conducted a secondary data analysis to examine attitudes, perceived control, and subjective norms of smoking in a sample of lung cancer survivors (N= 171). Analyses were limited to those with a smoking history (i.e., former (n= 139) and current smokers (n= 32)). While logistic regression modeling was considered, unequal subsample sizes ((n= 139 and n= 32) biased results. Chi-square goodness-of-fit tests and independent-samples t-tests were utilized to examine how group differences in smoking history predict theory-related factors of intention to quit smoking (i.e., individual attitudes, perceived control, and subjective norms). Results: When compared to former smokers, we found that significantly more current smokers reported living with an individual who smokes regularly, p\u3c .05. Other predictors and demographic variables were not significantly associated with smoking status (former vs. current), p’s \u3e .05. Conclusions: Some lung cancer survivors may find it difficult to quit smoking due to subjective norms that encourage smoking at home. Indeed, living with someone who smokes regularly may decrease an individual’s intention to quit smoking. Smoking cessation programs that incorporate significant others and close relationships may be more effective than those that focus exclusively on patients who continue to smoke. Further longitudinal research is needed to support our findings and identify other risk factors for continuing to smoke after a lung cancer diagnosis. Keywords: lung cancer, cancer, smoker, smoking cessation, lung cancer survivor, Theory of Planned Behavior, quit smoking, subjective norm

Changes in the Phase of the Annual Cycle of Surface Temperature

The annual cycle in the Earth's surface temperature is extremely large—comparable in magnitude to the glacial–interglacial cycles over most of the planet. Trends in the phase and the amplitude of the annual cycle have been observed, but the causes and significance of these changes remain poorly understood—in part because we lack an understanding of the natural variability. Here we show that the phase of the annual cycle of surface temperature over extratropical land shifted towards earlier seasons by 1.7 days between 1954 and 2007; this change is highly anomalous with respect to earlier variations, which we interpret as being indicative of the natural range. Significant changes in the amplitude of the annual cycle are also observed between 1954 and 2007. These shifts in the annual cycles appear to be related, in part, to changes in the northern annular mode of climate variability, although the land phase shift is significantly larger than that predicted by trends in the northern annular mode alone. Few of the climate models presented by the Intergovernmental Panel on Climate Change reproduce the observed decrease in amplitude and none reproduce the shift towards earlier seasons.Earth and Planetary Science

Migrating to Cloud-Native Architectures Using Microservices: An Experience Report

Migration to the cloud has been a popular topic in industry and academia in recent years. Despite many benefits that the cloud presents, such as high availability and scalability, most of the on-premise application architectures are not ready to fully exploit the benefits of this environment, and adapting them to this environment is a non-trivial task. Microservices have appeared recently as novel architectural styles that are native to the cloud. These cloud-native architectures can facilitate migrating on-premise architectures to fully benefit from the cloud environments because non-functional attributes, like scalability, are inherent in this style. The existing approaches on cloud migration does not mostly consider cloud-native architectures as their first-class citizens. As a result, the final product may not meet its primary drivers for migration. In this paper, we intend to report our experience and lessons learned in an ongoing project on migrating a monolithic on-premise software architecture to microservices. We concluded that microservices is not a one-fit-all solution as it introduces new complexities to the system, and many factors, such as distribution complexities, should be considered before adopting this style. However, if adopted in a context that needs high flexibility in terms of scalability and availability, it can deliver its promised benefits

Prenatal exposure to methadone or buprenorphine: Early childhood developmental outcomes.

BACKGROUND: Methadone and buprenorphine are recommended to treat opioid use disorders during pregnancy. However, the literature on the relationship between longer-term effects of prenatal exposure to these medications and childhood development is both spare and inconsistent. METHODS: Participants were 96 children and their mothers who participated in MOTHER, a randomized controlled trial of opioid-agonist pharmacotherapy during pregnancy. The present study examined child growth parameters, cognition, language abilities, sensory processing, and temperament from 0 to 36 months of the child\u27s life. Maternal perceptions of parenting stress, home environment, and addiction severity were also examined. RESULTS: Tests of mean differences between children prenatally exposed to methadone vs. buprenorphine over the three-year period yielded 2/37 significant findings for children. Similarly, tests of mean differences between children treated for NAS relative to those not treated for NAS yielded 1/37 significant finding. Changes over time occurred for 27/37 child outcomes including expected child increases in weight, head and height, and overall gains in cognitive development, language abilities, sensory processing, and temperament. For mothers, significant changes over time in parenting stress (9/17 scales) suggested increasing difficulties with their children, notably seen in increasing parenting stress, but also an increasingly enriched home environment (4/7 scales). CONCLUSIONS: Findings strongly suggest no deleterious effects of buprenorphine relative to methadone or of treatment for NAS severity relative to not-treated for NAS on growth, cognitive development, language abilities, sensory processing, and temperament. Moreover, findings suggest that prenatal opioid agonist exposure is not deleterious to normal physical and mental development