3,027 results on '"Page, D"'
Search Results
2. Components in Tobacco-Free School Policies--A Coding Tool for Assessment
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Ginny Chadwick, Page D. Dobbs, Kathryn Gluesenkamp, Delanie Vinzant, and Kevin D. Everett
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Objective: To develop an instrument to examine tobacco-free campus policy components. Participants: Missouri two- and four-year, specialized/technical, and religious colleges and universities (N = 76). Methods: The instrument was informed via literature review and expert interviews. Coder agreement was strong ([kappa] = 0.80). Qualitative policy language examples were identified. Results: Model policy components including consideration for population, prohibited products, location restrictions, enforcement, consequences, promotions, communications, cessation, designated smoking areas and exemptions; comprehensive policies included all populations, for all tobacco products, and at all locations on the campus. Nineteen campuses had comprehensive tobacco-free policies, five had comprehensive smoke-free policies (cigarettes and e-cigarettes), and no policy included all model components. Fifty-two were non-comprehensive. Conclusions: This instrument can allow campuses to identify components for comprehensive and model tobacco-free campus policies and assist officials in improving policy language. Future research can use this instrument to examine the effectiveness of components and their impact on tobacco use outcomes.
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- 2024
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3. Online Interest in Elf Bar in the United States: Google Health Trends Analysis
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Akshaya Srikanth Bhagavathula and Page D Dobbs
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Computer applications to medicine. Medical informatics ,R858-859.7 ,Public aspects of medicine ,RA1-1270 - Abstract
BackgroundDespite the popularity of JUUL e-cigarettes, other brands (eg, Elf Bar) may be gaining digital attention. ObjectiveThis study compared Google searches for Elf Bar and JUUL from 2022 to 2023 using Google Health Trends Application Programming Interface data. MethodsUsing an infodemiology approach, we examined weekly trends in Google searches (per 10 million) for “Elf Bar” and “JUUL” at the US national and state levels from January 1, 2022, to December 31, 2023. Joinpoint regression was used to assess statistically significant trends in the search probabilities for “Elf Bar” and “JUUL” during the study period. ResultsElf Bar had less online interest than JUUL at the beginning of 2022. When the US Food and Drug Administration denied JUUL marketing authority on June 23, 2022, JUUL searches peaked at 2609.3 × 107 and fell to 83.9 × 107 on September 3, 2023. Elf Bar searches surpassed JUUL on July 10, 2022, and steadily increased, reaching 523.2 × 107 on December 4, 2022. Overall, Elf Bar’s weekly search probability increased by 1.6% (95% CI 1.5%-1.7%; P=.05) from January 2022 to December 2023, with the greatest increase between May 29 and June 19, 2022 (87.7%, 95% CI 35.9%-123.9%; P=.001). Elf Bar searches increased after JUUL’s suspension in Pennsylvania (1010%), Minnesota (872.5%), Connecticut (803.5%), New York (738.1%), and New Jersey (702.9%). ConclusionsIncreasing trends in Google searches for Elf Bar indicate that there was a growing online interest in this brand in the United States in 2022.
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- 2024
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4. Social Risk of Pregnant Women at a Community Health Center: An Application of the PRAPARE Assessment Tool
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Luzius, Abbie, Merriweather, Maya, Busch, Savannah, James, Olivia, and Dobbs, Page D.
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- 2023
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5. Constraining the properties of dense neutron star cores: The case of the low-mass X-ray binary HETE J1900.1-2455
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Degenaar, N., Page, D., Eijnden, J. van den, Beznogov, M. V., Wijnands, R., and Reynolds, M.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
Measuring the time evolution of the effective surface temperature of neutron stars can provide invaluable information on the properties of their dense cores. Here, we report on a new Chandra observation of the transient neutron star low-mass X-ray binary HETE J1900.1-2455, which was obtained ~2.5 yr after the end of its ~10-yr long accretion outburst. The source is barely detected during the observation, collecting only six net photons, all below 2 keV. Assuming that the spectrum is shaped as a neutron star atmosphere model we perform a statistical analysis to determine a 1-sigma confidence upper range for the neutron star temperature of ~30-39 eV (for an observer at infinity), depending on its mass, radius and distance. Given the heat injected into the neutron star during the accretion outburst, estimated from data provided by all-sky monitors, the inferred very low temperature suggests that either the core has a very high heat capacity or undergoes very rapid neutrino cooling. While the present data do not allow us to disentangle these two possibilities, both suggest that a significant fraction of the dense core is not superfluid/superconductor. Our modeling of the thermal evolution of the neutron star predicts that it may still cool further, down to a temperature of ~15 eV. Measuring such a low temperature with a future observation may provide constraints on the fraction of baryons that is paired in the stellar core., Comment: 14 pages (12 main, 2 appendix), 10 figures, published in MNRAS
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- 2021
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6. Unexpected late-time temperature increase observed in two neutron star crust cooling sources -- XTE~J1701-462 and EXO~0748-676
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Parikh, A. S., Wijnands, R., Homan, J., Degenaar, N., Wolvers, B., Ootes, L. S., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
Transient LMXBs that host neutron stars (NSs) provide excellent laboratories for probing the dense matter physics present in NS crusts. During accretion outbursts in LMXBs, exothermic reactions may heat the NS crust, disrupting the crust-core equilibrium. When the outburst ceases, the crust cools to restore thermal equilibrium with the core. Monitoring this evolution allows us to probe the dense matter physics in the crust. Properties of the deeper crustal layers can be probed at later times after the end of the outburst. We report on the unexpected late-time temperature evolution (>2000 days after the end of their outbursts) of two NSs in LMXBs, XTE J1701-462 and EXO 0748-676. Although both these sources exhibited very different outbursts (in terms of duration and the average accretion rate), they exhibit an unusually steep decay of ~7 eV in the observed effective temperature (occurring in a time span of ~700 days) around ~2000 days after the end of their outbursts. Furthermore, they both showed an even more unexpected rise of ~3 eV in temperature (over a time period of ~500-2000 days) after this steep decay. This rise was significant at the 2.4{\sigma} and 8.5{\sigma} level for XTE J1701-462 and EXO 0748-676, respectively. The physical explanation for such behaviour is unknown and cannot be straightforwardly be explained within the cooling hypothesis. In addition, this observed evolution cannot be well explained by low-level accretion either without invoking many assumptions. We investigate the potential pathways in the theoretical heating and cooling models that could reproduce this unusual behaviour, which so far has been observed in two crust-cooling sources. Such a temperature increase has not been observed in the other NS crust-cooling sources at similarly late times, although it cannot be excluded that this might be a result of the inadequate sampling obtained at such late times., Comment: accepted for publication by A&A letters
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- 2020
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7. Implications for structural reliability as indicated by in-service observations of timber durability
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Walford, G B and Page, D R
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- 1999
8. Pregnancy-Specific Stress and Racial Discrimination Among U.S. Women
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Johnson, Aleyah, Dobbs, Page D., Coleman, Lois, and Maness, Sarah
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Racism -- Health aspects ,Health care disparities -- Evaluation ,Pregnant women -- Health aspects ,Health care industry - Abstract
Objectives Adverse birth outcomes among children born to women of color (WOC) have been associated with discrimination during pregnancy; however, little research has explored stressed caused by discrimination as well as pregnancy-specific stress. The purpose of this study was to examine differences in stress and racial discrimination (lifetime and during pregnancy) between U.S. women of different racial/ethnic groups. Methods Women between 18 and 45 years (n = 198; 101 non-Hispanic White, 58 Black, and 39 other WOC [i.e., Hispanic, Asian/Pacific Islander, American Indian, Mixed Race]) completed an online, cross-sectional survey between December 2019 and March 2020. Participants reported pregnancy-specific stress using the pregnancy distress questionnaire (PDQ) and pregnancy life events scale (PLE) and discrimination via the general ethnic discrimination scale (GED). ANOVAs explored differences between racial/ethnic groups' stress and discrimination. Results We found non-Hispanic White (p < 0.05) and other WOC (p < 0.01) reported higher distress during pregnancy than Black women, and other WOC (p < 0.05) reported more stressful prenatal life events (p 0.05) than non-Hispanic Whites. However, Black (p 0.001) and other WOC (p 0.001) both experienced more ethnic discrimination throughout their lifetime and during their pregnancy than non-Hispanic Whites. Also, Black women experienced five times the stress from these encounters than White women (p < 0.001). Conclusions for Practice Previously developed pregnancy distress questionnaires may be better suited for non-Hispanic White populations and may miss important experiences unique to marginalized populations such as racial/ethnic discrimination. Adaptations to pregnancy-related stress scales are warranted given the toxicity of discrimination during pregnancy., Author(s): Aleyah Johnson [sup.1] , Page D. Dobbs [sup.1] [sup.2] [sup.3] , Lois Coleman [sup.1] [sup.4] , Sarah Maness [sup.1] [sup.5] Author Affiliations: (1) grid.266900.b, 0000 0004 0447 0018, Department [...]
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- 2023
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9. Potential Risk Factors for Cigarette Use among a Sample of College JUUL Users
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Dobbs, Page D., Hodges, Elise J., Dunlap, Chris M., and Cheney, Marshall K.
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Objective: To examine the relationship between demographics, other tobacco use, and JUUL dependency on combustible cigarette use among college JUUL users. Participants: Undergraduates (n = 595) at a large southwestern university who used JUUL weekly completed a cross-sectional online survey in March 2019. Methods: Logistic regressions examined associations between covariates and ever use/past 30-day use of cigarettes. Results: As age increased, odds of ever trying a cigarette increased (AOR = 1.87; 95% CI = 1.45-2.41); however, as age of JUUL initiation increased, odds of ever (AOR = 0.80; 95% CI = 0.65-0.99) or past 30-day (AOR = 0.78; 95% CI = 0.63-0.97) cigarette use decreased. Those moderately (AOR = 2.03; 95% CI = 1.07-3.82) or highly (AOR = 8.01; 95% CI = 3.08-20.83) dependent on JUUL were more likely to have tried cigarettes than those not dependent. However, dependence was not associated with past 30-day use. Conclusions: JUUL users may not transition to combustible cigarettes during college. Longitudinal studies are needed to examine transitions in JUUL users' tobacco product use after college.
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- 2022
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10. Human Papillomavirus (HPV) Knowledge, Beliefs, and Vaccine Uptake among United States and International College Students
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Karki, Ishu, Dobbs, Page D., Larson, Daniel, and Maness, Sarah B.
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Objective: The purpose of this study was to compare knowledge about human papillomavirus (HPV) and HPV vaccine, college student's beliefs toward HPV, and HPV vaccine uptake between US and international college students studying in the US. Participants: The study was conducted using a sample (N = 588) of college students from a university in the South Central US. Methods: Study measures was derived from previously validated measures. Data were collected via an online survey using Qualtrics. Results: Significant differences were found in HPV awareness, HPV vaccine awareness, and HPV vaccine uptake between US and international college students. Conclusion: This study showed existing disparities between US and international college students regarding HPV and HPV vaccine awareness, and HPV vaccine uptake. College health centers can play a crucial role in raising awareness of HPV and HPV vaccination rates by organizing various intervention programs to reduce these disparities.
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- 2022
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11. Crust cooling of the neutron star in Aql X-1: Different depth and magnitude of shallow heating during similar accretion outbursts
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Degenaar, N., Ootes, L. S., Page, D., Wijnands, R., Parikh, A. S., Homan, J., Cackett, E. M., Miller, J. M., Altamirano, D., and Linares, M.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
The structure and composition of the crust of neutron stars plays an important role in their thermal and magnetic evolution, hence in setting their observational properties. One way to study the crust properties is to measure how it cools after it has been heated during an accretion outburst in a low-mass X-ray binary (LMXB). Such studies have shown that there is a tantalizing source of heat, of currently unknown origin, that is located in the outer layers of the crust and has a strength that varies between different sources and different outbursts. With the aim of understanding the mechanism behind this "shallow heating", we present Chandra and Swift observations of the neutron star LMXB Aql X-1, obtained after its bright 2016 outburst. We find that the neutron star temperature was initially much lower, and started to decrease at much later time, than observed after the 2013 outburst of the source, despite the fact that the properties of the two outbursts were very similar. Comparing our data to thermal evolution simulations, we infer that the depth and magnitude of shallow heating must have been much larger during the 2016 outburst than during the 2013 one. This implies that basic neutron star parameters that do not change between outbursts, do not play a strong role in shallow heating. Furthermore, it suggests that outbursts with a similar accretion morphology can give rise to very different shallow heating. We also discuss alternative explanations for the difference in quiescent evolution after the 2016 outburst., Comment: 10 pages, 6 figures, 2 tables, accepted to MNRAS
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- 2019
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12. Long-term temperature evolution of neutron stars undergoing episodic accretion outbursts
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Ootes, L. S., Wijnands, R., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
Transient neutron star (NS) LMXBs undergo episodes of accretion, alternated with quiescent periods. During an accretion outburst, the NS heats up due to exothermic accretion-induced processes taking place in the crust. Besides the long-known deep crustal heating of nuclear origin, a likely non-nuclear source of heat, dubbed 'shallow heating', is present at lower densities. Most of the accretion-induced heat slowly diffuses into the core on a timescale of years. Over many outburst cycles, a state of equilibrium is reached when the core temperature is high enough that the heating and cooling (photon and neutrino emission) processes are in balance. We investigate how stellar characteristics and outburst properties affect the long-term temperature evolution of a transiently accreting NS. For the first time the effects of crustal properties are considered, particularly that of shallow heating. Using our code NSCool, we tracked the thermal evolution of a NS undergoing outbursts over a period of $10^5$ yr. The outburst sequence is based on the regular outbursts observed from Aql X-1. For each model, we calculated the timescale over which equilibrium was reached and we present these timescales along with the temperature and luminosity parameters of the equilibrium state. We find that shallow heating significantly contributes to the equilibrium state. Increasing its strength raises the equilibrium core temperature. We find that if deep crustal heating is replaced by shallow heating alone, the core would still heat up, reaching only a 2% lower equilibrium core temperature. Deep crustal heating may therefore not be vital to the heating of the core. Additionally, shallow heating can increase the quiescent luminosity to values higher than previously expected., Comment: 20 pages, 18 figures, 2 tables, accepted for publication in A&A
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- 2019
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13. Unruh Acceleration Radiation Revisited
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Ben-Benjamin, J. S., Scully, M. O., Fulling, S. A., Lee, D. M., Page, D. N., Svidzinsky, A. A., Zubairy, M. S., Duff, M. J., Glauber, R., Schleich, W. P., and Unruh, W. G.
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Quantum Physics ,General Relativity and Quantum Cosmology - Abstract
When ground-state atoms are accelerated and the field with which they interact is in its normal vacuum state, the atoms detect Unruh radiation. We show that atoms falling into a black hole emit acceleration radiation which, under appropriate initial conditions (Boulware vacuum), has an energy spectrum which looks much like Hawking radiation. This analysis also provides insight into the Einstein principle of equivalence between acceleration and gravity. The Unruh temperature can also be obtained by using the Kubo--Martin--Schwinger (KMS) periodicity of the two-point thermal correlation function, for a system undergoing uniform acceleration; as with much of the material in this paper, this known result is obtained with a twist., Comment: In honor of Julian Schwinger 27 pages, 10 figures
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- 2019
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14. Twitter Sentiment About the US Federal Tobacco 21 Law: Mixed Methods Analysis
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Page D Dobbs, Allison Ames Boykin, Nnamdi Ezike, Aaron J Myers, Jason B Colditz, and Brian A Primack
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Medicine - Abstract
BackgroundOn December 20, 2019, the US “Tobacco 21” law raised the minimum legal sales age of tobacco products to 21 years. Initial research suggests that misinformation about Tobacco 21 circulated via news sources on Twitter and that sentiment about the law was associated with particular types of tobacco products and included discussions about other age-related behaviors. However, underlying themes about this sentiment as well as temporal trends leading up to enactment of the law have not been explored. ObjectiveThis study sought to examine (1) sentiment (pro-, anti-, and neutral policy) about Tobacco 21 on Twitter and (2) volume patterns (number of tweets) of Twitter discussions leading up to the enactment of the federal law. MethodsWe collected tweets related to Tobacco 21 posted between September 4, 2019, and December 31, 2019. A 2% subsample of tweets (4628/231,447) was annotated by 2 experienced, trained coders for policy-related information and sentiment. To do this, a codebook was developed using an inductive procedure that outlined the operational definitions and examples for the human coders to annotate sentiment (pro-, anti-, and neutral policy). Following the annotation of the data, the researchers used a thematic analysis to determine emergent themes per sentiment category. The data were then annotated again to capture frequencies of emergent themes. Concurrently, we examined trends in the volume of Tobacco 21–related tweets (weekly rhythms and total number of tweets over the time data were collected) and analyzed the qualitative discussions occurring at those peak times. ResultsThe most prevalent category of tweets related to Tobacco 21 was neutral policy (514/1113, 46.2%), followed by antipolicy (432/1113, 38.8%); 167 of 1113 (15%) were propolicy or supportive of the law. Key themes identified among neutral tweets were news reports and discussion of political figures, parties, or government involvement in general. Most discussions were generated from news sources and surfaced in the final days before enactment. Tweets opposing Tobacco 21 mentioned that the law was unfair to young audiences who were addicted to nicotine and were skeptical of the law’s efficacy and importance. Methods used to evade the law were found to be represented in both neutral and antipolicy tweets. Propolicy tweets focused on the protection of youth and described the law as a sensible regulatory approach rather than a complete ban of all products or flavored products. Four spikes in daily volume were noted, 2 of which corresponded with political speeches and 2 with the preparation and passage of the legislation. ConclusionsUnderstanding themes of public sentiment—as well as when Twitter activity is most active—will help public health professionals to optimize health promotion activities to increase community readiness and respond to enforcement needs including education for retailers and the general public.
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- 2023
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15. Using the PRAPARE Tool to Examine Those Tested and Testing Positive for COVID-19 at a Community Health Center
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Luzius, Abbie, Dobbs, Page D., Hammig, Bart, Kirkish, Rebekah, and Mojica, Monica
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- 2022
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16. Consistent accretion-induced heating of the neutron-star crust in MXB 1659-29 during two different outbursts
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Parikh, A. S., Wijnands, R., Ootes, L. S., Page, D., Degenaar, N., Bahramian, A., Brown, E. F., Cackett, E. M., Cumming, A., Heinke, C., Homan, J., Escorial, A. Rouco, and Wijngaarden, M. J. P.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
Monitoring the cooling of neutron-star crusts heated during accretion outbursts allows us to infer the physics of the dense matter present in the crust. We examine the crust cooling evolution of the low-mass X-ray binary MXB 1659-29 up to ~505 days after the end of its 2015 outburst (hereafter outburst II) and compare it with what we observed after its previous 1999 outburst (hereafter outburst I) using data obtained from the Swift, XMM-Newton, and Chandra observatories. The observed effective surface temperature of the neutron star in MXB 1659-29 dropped from ~92 eV to ~56 eV from ~12 days to ~505 days after the end of outburst II. The most recently performed observation after outburst II suggests that the crust is close to returning to thermal equilibrium with the core. We model the crust heating and cooling for both its outbursts collectively to understand the effect of parameters that may change for every outburst (e.g., the average accretion rate, the length of outburst, the envelope composition of the neutron star at the end of the outburst) and those which can be assumed to remain the same during these two outbursts (e.g., the neutron star mass, its radius). Our modelling indicates that all parameters were consistent between the two outbursts with no need for any significant changes. In particular, the strength and the depth of the shallow heating mechanism at work (in the crust) were inferred to be the same during both outbursts, contrary to what has been found when modelling the cooling curves after multiple outburst of another source, MAXI J0556-332. This difference in source behaviour is not understood. We discuss our results in the context of our current understanding of cooling of accretion-heated neutron-star crusts, and in particular with respect to the unexplained shallow heating mechanism., Comment: Submitted to A&A. The supplementary video can be found at https://www.youtube.com/watch?v=OpJ053zq9-M
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- 2018
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17. Continued cooling of the accretion-heated neutron star crust in the X-ray transient IGR J17480-2446 located in the globular cluster Terzan 5
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Ootes, L. S., Vats, S., Page, D., Wijnands, R., Parikh, A. S., Degenaar, N., Wijngaarden, M. J. P., Altamirano, D., Bahramian, A., Cackett, E. M., Heinke, C. O., Homan, J., and Miller, J. M.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present a new Chandra observation (performed in July 2016) of the neutron star X-ray transient IGR J17480-2446, located in the globular cluster Terzan 5. We study the continued cooling of the neutron star crust in this system that was heated during the 2010 outburst of the source. This new observation was performed two years after the last observation of IGR J17480-2446, hence, significantly extending the cooling baseline. We reanalysed all available Chandra observations of the source (but excluding observations during which one of the known transients in Terzan 5 was in outburst) and fitted the obtained cooling curve with our cooling code NSCool, which allows for much improved modelling than what was previously performed for the source. The data and our fit models indicate that the crust was still cooling ~5.5 years after the outburst ended. The neutron star crust has likely not reached crust-core thermal equilibrium yet, and further cooling is predicted (which can be confirmed with additional Chandra observations in >5 years). Intriguingly, we find indications that the thermal conductivity might be relatively low in part of the crust compared to what has been inferred for other crust-cooling sources and tentatively suggest that this layer might be located around the neutron drip. The reason for this difference is unclear, but might be related to the fact that IGR J17480-2446 harbours a relatively slowly rotating neutron star (with a spin of 11 Hz) that has a relatively strong inferred surface magnetic field ($10^{9-10}$ Gauss) compared to what is known or typically assumed for other cooling sources., Comment: 17 pages, 10 figures, 4 tables, accepted for publication in MNRAS
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- 2018
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18. Multiwavelength observations of MASTER OT 075353.88+174907.6: a likely superoutburst of a long period dwarf nova system
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Parikh, A. S., Santisteban, J. V. Hernández, Wijnands, R., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
MASTER OT 075353.88+174907.6 was a blue optical transient reported by the MASTER-Net project on 2017 Oct 31. This source was previously detected by {\it GALEX} in its NUV band but not by the Sloan Digital Sky Survey (in the optical). We carried out multiwavelength follow-up observations of this source during its 2017 outburst using {\it Swift} and RATIR. The source was found to be $\gtrsim$4.4 mag above its quiescent level during the peak of the outburst and the outburst lasted $\gtrsim$19 days. Our observations suggest that it was a superoutburst of a long orbital period U Geminorum type dwarf nova system. The spectral energy distribution during the initial slow decay phase of the outburst was consistent with a disk-dominated spectra (having spectral indices $\Gamma \! \sim$1.5--2.3). After this phase, the UV flux decreased slower than the optical and the spectral energy distribution was very steep with indices $\Gamma \! \sim$3.7$\pm$0.7. This slow decay in the UV may be the emission from a cooling white dwarf heated during the outburst. The spectral shape determined from the assumed pre-outburst quiescent level was also steep ($\Gamma \! \gtrsim$2.5) indicating that the white dwarf is still hot in quiescence (even after the cooling due to the potential accretion-induced heating has halted). No X-ray emission was detected from the source since it is likely located at a large distance $>$2.3 kpc., Comment: accepted by RMxAA, to appear in Volume 55
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- 2018
19. Further constraints on neutron star crustal properties in the low-mass X-ray binary 1RXS J180408.9$-$342058
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Parikh, A. S., Wijnands, R., Degenaar, N., Ootes, L., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
We report on two new quiescent {\it XMM-Newton} observations (in addition to the earlier {\it Swift}/XRT and {\it XMM-Newton} coverage) of the cooling neutron star crust in the low-mass X-ray binary 1RXS J180408.9$-$342058. Its crust was heated during the $\sim$4.5 month accretion outburst of the source. From our quiescent observations, fitting the spectra with a neutron star atmosphere model, we found that the crust had cooled from $\sim$ 100 eV to $\sim$73 eV from $\sim$8 days to $\sim$479 days after the end of its outburst. However, during the most recent observation, taken $\sim$860 days after the end of the outburst, we found that the crust appeared not to have cooled further. This suggested that the crust had returned to thermal equilibrium with the neutron star core. We model the quiescent thermal evolution with the theoretical crustal cooling code NSCool and find that the source requires a shallow heat source, in addition to the standard deep crustal heating processes, contributing $\sim$0.9 MeV per accreted nucleon during outburst to explain its observed temperature decay. Our high quality {\it XMM-Newton} data required an additional hard component to adequately fit the spectra. This slightly complicates our interpretation of the quiescent data of 1RXS J180408.9$-$342058. The origin of this component is not fully understood., Comment: Accepted for publication by MNRAS
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- 2018
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20. A window into the neutron star: Modelling the cooling of accretion heated neutron star crusts
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Wijngaarden, M. J. P., Wijnands, R., Ootes, L. S., Parikh, A. S., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
In accreting neutron star X-ray transients, the neutron star crust can be substantially heated out of thermal equilibrium with the core during an accretion outburst. The observed subsequent cooling in quiescence (when accretion has halted) offers a unique opportunity to study the structure and thermal properties of the crust. Initially crust cooling modelling studies focussed on transient X-ray binaries with prolonged accretion outbursts (> 1 year) such that the crust would be significantly heated for the cooling to be detectable. Here we present the results of applying a theoretical model to the observed cooling curve after a short accretion outburst of only ~10 weeks. In our study we use the 2010 outburst of the transiently accreting 11 Hz X-ray pulsar in the globular cluster Terzan 5. Observationally it was found that the crust in this source was still hot more than 4 years after the end of its short accretion outburst. From our modelling we found that such a long-lived hot crust implies some unusual crustal properties such as a very low thermal conductivity (> 10 times lower than determined for the other crust cooling sources). In addition, we present our preliminary results of the modelling of the ongoing cooling of the neutron star in MXB 1659-298. This transient X-ray source went back into quiescence in March 2017 after an accretion phase of ~1.8 years. We compare our predictions for the cooling curve after this outburst with the cooling curve of the same source obtained after its previous outburst which ended in 2001., Comment: 4 pages, 1 figure, to appear in the proceedings of "IAUS 337: Pulsar Astrophysics - The Next 50 Years" eds: P. Weltevrede, B.B.P. Perera, L. Levin Preston & S. Sanidas
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- 2017
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21. Tobacco Prevention Education for Middle School and High School Educators
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Baer, Caroline M., Khoussine, Michaela A., and Dobbs, Page D.
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Objectives: In an attempt to reduce tobacco use among adolescents in the USA, some health educators have created school-based tobacco education programmes. However, none currently exist for middle and high school educators. The current study sought to determine if middle and high school educators' knowledge about combustible cigarettes and electronic cigarettes (e-cigarettes) improved following an educational session about youth tobacco use. Design: Pre-/post-assessment was employed to measure change in knowledge. Setting: Educators (N = 41) from a rural, southern middle and high school were invited to take part in the study during an educational workshop held during an in-service training event. Method: In addition to seven knowledge questions, participants also provided demographic information and details of current and previous use of cigarettes and e-cigarettes. Chi-square analyses examined changes in responses to individual items, and total pre-/post-knowledge score change was compared using a dependent t-test. Independent t-tests examined differences between knowledge change and participants' personal and behavioural characteristics. Results: Participants' overall knowledge improved from pre- to the post-test (p < 0.05); however, there was no relationship between pre-/post-test responses for individual items. In addition, there were no differences between participants' knowledge change when compared by age, sex, grades taught and past use of cigarettes or e-cigarettes. Discussion: Increasing middle school and high school educators' knowledge about tobacco products, particularly novel devices, is important due to the increasing rates of use among youth. More research is needed to determine how educators' knowledge can help decrease tobacco initiation and use among school-aged children.
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- 2021
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22. Harm perceptions, JUUL dependence, and other tobacco product use among young adults who use JUUL
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Lu, Yu, Dobbs, Page D., Song, Hairong, Dunlap, Christopher, and Cheney, Marshall K.
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- 2022
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23. Different accretion heating of the neutron star crust during multiple outbursts in MAXI J0556-332
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Parikh, A. S., Homan, J., Wijnands, R., Ootes, L. S., Page, D., Degenaar, D. Altamirano. N., Brown, E. F., Cackett, E. M., Cumming, A., Deibel, A., Fridriksson, J. K., Lin, D., Linares, M., and Miller, J. M.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
The transient neutron star (NS) low-mass X-ray binary MAXI J0556$-$332 provides a rare opportunity to study NS crust heating and subsequent cooling for multiple outbursts of the same source. We examine {\it MAXI}, {\it Swift}, {\it Chandra}, and {\it XMM-Newton} data of MAXI J0556$-$332 obtained during and after three accretion outbursts of different durations and brightness. We report on new data obtained after outburst III. The source has been tracked up to $\sim$1800 d after the end of outburst I. Outburst I heated the crust strongly, but no significant reheating was observed during outburst II. Cooling from $\sim$333 eV to $\sim$146 eV was observed during the first $\sim$1200 d. Outburst III reheated the crust up to $\sim$167 eV, after which the crust cooled again to $\sim$131 eV in $\sim$350 d. We model the thermal evolution of the crust and find that this source required a different strength and depth of shallow heating during each of the three outbursts. The shallow heating released during outburst I was $\sim$17 MeV nucleon$^{-1}$ and outburst III required $\sim$0.3 MeV nucleon$^{-1}$. These cooling observations could not be explained without shallow heating. The shallow heating for outburst II was not well constrained and could vary from $\sim$0--2.2 MeV nucleon$^{-1}$, i.e., this outburst could in principle be explained without invoking shallow heating. We discuss the nature of the shallow heating and why it may occur at different strengths and depths during different outbursts., Comment: Accepted for publication by ApJ Letters
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- 2017
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24. Components in tobacco-free school policies—A coding tool for assessment.
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Chadwick, Ginny, Dobbs, Page D., Gluesenkamp, Kathryn, Vinzant, Delanie, and Everett, Kevin D.
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- *
SMOKING prevention , *SMOKING cessation , *SMOKING cessation products , *GOVERNMENT policy , *TOBACCO , *UNIVERSITIES & colleges , *INTERVIEWING , *EXPERIMENTAL design , *RESEARCH methodology , *MEDICAL coding , *SCHOOL administration , *COMMUNICATION , *TOBACCO products , *HEALTH promotion - Abstract
Objective: To develop an instrument to examine tobacco-free campus policy components. Participants: Missouri two- and four-year, specialized/technical, and religious colleges and universities (N = 76). Methods: The instrument was informed via literature review and expert interviews. Coder agreement was strong (κ =.80). Qualitative policy language examples were identified. Results: Model policy components including consideration for population, prohibited products, location restrictions, enforcement, consequences, promotions, communications, cessation, designated smoking areas and exemptions; comprehensive policies included all populations, for all tobacco products, and at all locations on the campus. Nineteen campuses had comprehensive tobacco-free policies, five had comprehensive smoke-free policies (cigarettes and e-cigarettes), and no policy included all model components. Fifty-two were non-comprehensive. Conclusions: This instrument can allow campuses to identify components for comprehensive and model tobacco-free campus policies and assist officials in improving policy language. Future research can use this instrument to examine the effectiveness of components and their impact on tobacco use outcomes. [ABSTRACT FROM AUTHOR]
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- 2024
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25. Patient–provider communication about cigarette and e-cigarette use during pregnancy: Adaptation and validation of frequency and quality of communication measures among a sample of pregnant patients.
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Richardson, Emily M., Schisler, Eric, and Dobbs, Page D.
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PREGNANT women ,ELECTRONIC cigarettes ,EXPLORATORY factor analysis ,CIGARETTES ,MEDICAL personnel - Abstract
INTRODUCTION Quality of patient–provider communication regarding tobacco use may encourage cessation that could lead to improved health outcomes for mothers and children. However, currently there are no validated measures of frequency and quality of patient–provider communication about cigarettes and e-cigarettes. The objective of this study was to adapt and validate measures of frequency and quality of patient–provider communication about smoking and e-cigarette use among a sample of pregnant mothers who currently smoked. METHODS An online sample of US pregnant women who reported past 30-day smoking were recruited to complete a cross-sectional, online survey (n=267). An exploratory factor analysis examined the factor structure of four measures of frequency and quality of patient–provider communication about cigarettes and e-cigarettes among those who reported prior communication with their provider about cigarettes and e-cigarettes (n=170). Relationships between measures were explored, and a logistic regression explored each measure’s association with intention to switch from cigarettes to e-cigarettes. RESULTS Items measuring the frequency of communication loaded onto one factor for both cigarettes and e-cigarettes (α=0.88). Quality of communication loaded onto two factors for both cigarettes and e-cigarettes, termed active communication and internalized perception. Internalized perceptions of communication quality about cigarettes (β= -0.32, p<0.002), active communication (β=0.46, p<0.02), and internalized perceptions of communication about e-cigarettes (β= -0.36, p<0.001) were related to intention to switch, in separated models. CONCLUSIONS Quality conversations between healthcare providers and pregnant patients is likely more important for behavioral decision-making than the frequency of communication. [ABSTRACT FROM AUTHOR]
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- 2024
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26. Association of psychological distress and current cigarette smoking among Native Hawaiian and Pacific Islander adults and compared to adults from other racial/ethnic groups: Data from the National Health Interview Survey, 2014
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Narcisse, Marie-Rachelle, Shah, Sumit K., Felix, Holly C., Dobbs, Page D., and McElfish, Pearl A.
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- 2022
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27. Where College Students Look for Vaping Information and What Information They Believe
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Dobbs, Page D., Clawson, Ashley H., Gowin, Mary, and Cheney, Marshall K.
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Objective: This convergent mixed methods study examined how information sources influence college students' beliefs and knowledge about vaping. Participants: College students either completed a survey (n = 522; January-April, 2016) or were interviewed (n = 33; 2015-2016). Methods: College students completed an online survey asking 'where' students had heard about e-cigarette and 'what' they had heard. Responses were quantified and a chi-square analysis was conducted. Additional college student e-cigarette users were interviewed about the credibility of information sources. Thematic analysis was conducted with the coded interviews. Results: There was a significant relationship between information sources for e-cigarettes (social sources, media, advertising, education/research) and the messages they recalled. Friends who vaped and e-cigarette users were the most credible information sources. Confirmation bias and scientific impotence bias characterized assessment of e-cigarette information. Conclusions: Health education specialists working on college campuses should provide accurate information via communication channels most unitized by college students.
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- 2020
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28. Intention to Use E-Cigarettes to Quit Smoking: A Reasoned Action Approach
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Dobbs, Page D., Branscum, Paul, and Wilkerson, Amanda H.
- Abstract
Background: Some electronic cigarette (e-cigarette) users report using these products to quit smoking combustible cigarettes. Purpose: Using the Reasoned Action Approach (RAA), we sought to develop, confirm, and explore a measure of current smokers' intentions, attitudes (instrumental and experiential), social norms (injunctive and descriptive), and perceived behavioral control (capacity and autonomy) to use e-cigarettes to quit smoking. Methods: A sample of US young adults completed one of two cross-sectional online surveys. For the first sample (n = 315) exploratory factor analysis (EFA) was used to examine the structure of the original 31-item instrument. The second sample (n = 315) confirmed the model using confirmatory factor analysis (CFA). Structural equation modeling (SEM) tested the constructs' ability to predict intention. Results: SEM indicated instrumental attitudes (p < 0.05), experiential attitudes (p < 0.01), and injunctive norms (p < 0.05) predicted young adults' intentions to use e-cigarettes to quit smoking (r[superscript 2] = 0.43). Discussion: Further exploration is needed to determine if intention to use e-cigarettes to quit smoking is predictive of short- and long-term smoking abstinence. Translation to Health Education Practice: Health educators should emphasize the experience of using e-cigarettes, the importance of quitting cigarettes completely, and injunctive norms who support young adults switching to these devices.
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- 2020
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29. College Students' Reasons for Using Different E-Cigarette Products: A Mixed Methods Analysis
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Luzius, Abbie, Dobbs, Page D., and Jozkowski, Kristen N.
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Objective: This study examined if college students used particular e-cigarette devices for different reasons. Participants: College students from a large southern university completed an online, close- and open-ended survey. Data were delimited to those 18-25 years of age who had used e-cigarettes (n = 338). Methods: A convergent mixed-methods design was employed by quantifying qualitative responses via an inducting coding method. Next, X[superscript 2] analyses examined relationships between use of different products (i.e., cigalikes, vape pens, eGos, mods) and reasons for using e-cigarettes. Results: Emerging themes representing reasons for trying e-cigarettes included: curiosity, peer pressure, recreation, flavors, better than cigarettes, and to quit/reduce tobacco use. Significant relationships existed between use of cigalikes, (p < 0.01), eGos (p < 0.05), and mods (p < 0.05) and use of e-cigarettes to quitting/reducing tobacco use. Conclusions: Health promotion efforts on college campuses should address curiosity about these products and provide scientifically proven therapy to those seeking to quit tobacco.
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- 2020
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30. Erratum to 'Factors that influence Puerto Rican's intention to get the COVID- 19 vaccine' [Exploratory Research in Clinical and Social Pharmacy 5C (2022) 100106]
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Page D. Dobbs, Emily Herrmann, Charlie Vidal, Daniela Ameijeiras Mena, and Ches Jones
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Pharmacy and materia medica ,RS1-441 - Published
- 2022
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31. Cigarette and E-Cigarette Perceptions About Harm During Pregnancy
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McCann, Rebecca, primary, Richardson, Emily, additional, Schisler, Eric D., additional, Sudduth, Abbie, additional, and Dobbs, Page D., additional
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- 2024
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32. Pregnant Smokers’ Intention to Switch From Cigarettes to E-Cigarettes: A Reasoned Action Approach
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Dobbs, Page D., Branscum, Paul, Cohn, Amy M., Tackett, Alayna P., and Comiford, Ashley L.
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- 2021
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33. A cold neutron star in the transient low-mass X-ray binary HETE J1900.1-2455 after 10 years of active accretion
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Degenaar, N., Ootes, L. S., Reynolds, M. T., Wijnands, R., and Page, D.
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
The neutron star low-mass X-ray binary and intermittent millisecond X-ray pulsar HETE J1900.1-2455 returned to quiescence in late 2015, after a prolonged accretion outburst of ~10 yr. Using a Chandra observation taken ~180 d into quiescence we detect the source at a luminosity of ~4.5E31 (D/4.7 kpc)^2 erg/s (0.5-10 keV). The X-ray spectrum can be described by a neutron star atmosphere model with a temperature of ~54 eV for an observer at infinity. We perform thermal evolution calculations based on the 2016 quiescent data and a <98 eV temperature upper limit inferred from a Swift observation taken during an unusually brief (<2 weeks) quiescent episode in 2007. We find no evidence in the present data that the thermal properties of the crust, such as the heating rate and thermal conductivity, are different than those of non-pulsating neutron stars. Finding this neutron star so cold after its long outburst imposes interesting constraints on the heat capacity of the stellar core; these become even stronger if further cooling were to occur., Comment: 5 pages, 3 figures, accepted for publication in MNRAS Letters
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- 2016
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34. Gestational Women's Perceptions About the Harms of Cigarette and E-Cigarette Use During Pregnancy
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Dobbs, Page D., Lu, Yu, Maness, Sarah, Coleman, Lois, Johnson, Aleyah, Metz, Samantha, and Vidal, Charlie
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Health attitudes -- Surveys ,Pregnant women -- Surveys -- Health aspects ,Smoking in pregnancy -- Surveys -- Health aspects ,Health care industry - Abstract
Objectives The purpose of this study was to examine differences between perceived harm of cigarette and electronic cigarette (e-cigarette) use while pregnant and differences between healthcare providers' communication about these products during pregnancy. Methods A convenience sample of gestational women (n = 218; ages 18-45) living in the US completed an online survey between May and December 2017. Participants reported perceived likelihood of adverse health outcomes (e.g., low birth weight, sudden infant death syndrome) among infants/children born to mothers who used cigarettes/e-cigarettes. T-tests and two-way ANOVAs examined differences between risk perceptions of using cigarettes/e-cigarettes while pregnant based on pregnancy status (previously pregnant, currently pregnant, future pregnant). Chi-square analyses examined differences between healthcare provider communication about cigarette/e-cigarette use during pregnancy. Results Overall, participants believed adverse health outcomes were significantly more likely to be caused by maternal use of cigarettes than e-cigarettes. Participants who planned to be pregnant reported higher endorsement that smoking combustible cigarettes would cause a miscarriage (p < .05) or increased blood pressure (p < .05) for a child than currently pregnant participants. Participants reported healthcare providers asked about (p < .05), advised them not to use (p < .001), and talked to them about health effects of smoking combustible cigarettes while pregnant (p < .001) significantly more than e-cigarettes. Conclusions for Practice Healthcare providers working with pregnant women should perform the 5As behavioral intervention method to provide pregnant women with tobacco cessation care. They should also discuss the absolute harm nicotine exposure (via cigarettes or e-cigarettes) can have on fetal health and development., Author(s): Page D. Dobbs [sup.1] [sup.5] , Yu Lu [sup.2] , Sarah Maness [sup.2] , Lois Coleman [sup.2] , Aleyah Johnson [sup.2] , Samantha Metz [sup.3] , Charlie Vidal [sup.4] [...]
- Published
- 2021
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35. Family-Centered Interventions for Treatment and Prevention of Childhood Obesity in Hispanic Families: A Systematic Review
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Tamayo, Milicen C., Dobbs, Page D., and Pincu, Yair
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- 2021
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36. Interventions using mHealth strategies to improve screening rates of cervical cancer: A scoping review
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Bhochhibhoya, Shristi, Dobbs, Page D., and Maness, Sarah B.
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- 2021
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37. Young Adult JUUL Users' Beliefs About JUUL
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Cheney, Marshall K., Dobbs, Page D., Dunlap, Christopher, Lu, Yu, Oehlers, Julia, and Hodges, Elise
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- 2021
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38. A reasoned action approach to pregnant smokers’ intention to switch to e-cigarettes: Does educational attainment inflfluence theory application?
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Eric D. Schisler, Paul Branscum, Lydia Buckley, Rebecca McCann, Emily Richardson, Abbie Luzius, and Page D. Dobbs
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reasoned action approach ,e-cigarette ,pregnancy ,decision-making ,smoking ,switching ,Special aspects of education ,LC8-6691 ,Public aspects of medicine ,RA1-1270 - Abstract
Social determinant research has noted educational attainment to be among the strongest influencing factors for tobacco use during pregnancy. Concurrently, maternal e-cigarette use has doubled in recent years, with some citing it as a safer alternative to combustible cigarettes. To better understand the decision-making practices of pregnant persons based on educational attainment, the reasoned action approach (RAA) was used to evaluate factors that may be associated with the intention to switch from cigarettes to e-cigarettes. A sample of U.S. pregnant persons (n = 267) between 18-40 years of age, who smoked at least one cigarette in the past 30 days, completed an online survey about switching from cigarettes to e-cigarettes. RAA constructs (e.g., intentions, instrumental attitudes, etc.) were measured using a pre-validated scale. Using structural equation modeling, the variability of latent variables (i.e., RAA constructs) and their interaction with one another were analyzed by educational attainment via two regression models: one for those who had college experience or had completed a college degree and another for those who had not attended college. Instrumental attitudes, experiential attitudes, and descriptive norms were significantly associated with intention to switch from cigarettes to e-cigarettes among both groups; however, autonomy was only significantly associated with intention among those who had not attended college. The RAA offers a valuable framework for understanding pregnant persons’ decision to switch from cigarettes to e-cigarettes during pregnancy; however, the RAA constructs may be related to intentions differently based on upstream factors, such as educational attainment.
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- 2022
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39. Exploring Factors That Predict Marketing of e-Cigarette Products on Twitter: Infodemiology Approach Using Time Series
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Nnamdi C Ezike, Allison Ames Boykin, Page D Dobbs, Huy Mai, and Brian A Primack
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Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
BackgroundElectronic nicotine delivery systems (known as electronic cigarettes or e-cigarettes) increase risk for adverse health outcomes among naïve tobacco users, particularly youth and young adults. This vulnerable population is also at risk for exposed brand marketing and advertisement of e-cigarettes on social media. Understanding predictors of how e-cigarette manufacturers conduct social media advertising and marketing could benefit public health approaches to addressing e-cigarette use. ObjectiveThis study documents factors that predict changes in daily frequency of commercial tweets about e-cigarettes using time series modeling techniques. MethodsWe analyzed data on the daily frequency of commercial tweets about e-cigarettes collected between January 1, 2017, and December 31, 2020. We fit the data to an autoregressive integrated moving average (ARIMA) model and unobserved components model (UCM). Four measures assessed model prediction accuracy. Predictors in the UCM include days with events related to the US Food and Drug Administration (FDA), non-FDA-related events with significant importance such as academic or news announcements, weekday versus weekend, and the period when JUUL maintained an active Twitter account (ie, actively tweeting from their corporate Twitter account) versus when JUUL stopped tweeting. ResultsWhen the 2 statistical models were fit to the data, the results indicate that the UCM was the best modeling technique for our data. All 4 predictors included in the UCM were significant predictors of the daily frequency of commercial tweets about e-cigarettes. On average, brand advertisement and marketing of e-cigarettes on Twitter was higher by more than 150 advertisements on days with FDA-related events compared to days without FDA events. Similarly, more than 40 commercial tweets about e-cigarettes were, on average, recorded on days with important non-FDA events compared to days without such events. We also found that there were more commercial tweets about e-cigarettes on weekdays than on weekends and more commercial tweets when JUUL maintained an active Twitter account. Conclusionse-Cigarette companies promote their products on Twitter. Commercial tweets were significantly more likely to be posted on days with important FDA announcements, which may alter the narrative about information shared by the FDA. There remains a need for regulation of digital marketing of e-cigarette products in the United States.
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- 2022
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40. Cigarette and E-Cigarette Harm Perceptions During Pregnancy.
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McCann, Rebecca, Richardson, Emily, Schisler, Eric D., Sudduth, Abbie, and Dobbs, Page D.
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- 2024
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41. Factors that influence Puerto Rican's intention to get the COVID-19 vaccine
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Page D. Dobbs, Emily Herrmann, Charlie Vidal, Daniela Ameijeiras Mena, and Ches Jones
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COVID-19 ,Vaccine hesitancy ,Puerto Rico ,Decision making ,Pharmacy and materia medica ,RS1-441 - Abstract
Despite Latino Americans having been found to be disproportionally affected by COVID-19, they report higher hesitancy to receive the COVID-19 vaccine than non-Hispanic whites. The purpose of this study was to examine factors that influence Puerto Rican's intentions to get the COVID-19 Vaccine. A sample (n = 173) of people who currently lived in Puerto Rico were recruited to complete an online, cross-sectional survey about their intention to receive the COVID-19 vaccine. Demographics and vaccine hesitancy were assessed, and logistic regressions explored relationships between variables and intention to get the COVID-19 vaccine when it became available. When controlling for covariates, 30–49-year-olds (aOR = 0.12) and those who had refused a vaccine in the past (aOR = 0.07) had lower odds of vaccine uptake than those between 18 and 29 years and who had not previously refused a vaccine, respectively. Those who had completed at least a 4-year college degree (aOR = 6.78) had greater odds of intending to get vaccinated than their counterparts. Health education campaigns about COVID-19 in Puerto Rico should be tailored to working-age adults who may mistrust information they have heard about the vaccine. Messages could be tailored to preferred communication channels to decrease vaccination hesitancy.
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- 2022
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42. Prevalence of antibiotic resistance and virulence genes in the biofilms from an aquifer recharged with stormwater
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Sidhu, J.P.S., Gupta, V.V.S.R., Stange, C., Ho, J., Harris, N., Barry, K., Gonzalez, D., Van Nostrand, J.D., Zhou, J., Page, D., Tiehm, A., and Toze, S.
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- 2020
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43. Addiction vs. dependence: A mixed methods analysis of young adult JUUL users
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Dobbs, Page D., Hodges, Elise J., Dunlap, Chris M., and Cheney, Marshall K.
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- 2020
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44. VAMOS: a Pathfinder for the HAWC Gamma-Ray Observatory
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Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Ángeles, F., Arceo, R., Arteaga-Velázquez, J. C., Avila-Aroche, A., Solares, H. A. Ayala, Badillo, C., Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont, E., Benítez, E., BenZvi, S. Y., Berley, D., Bernal, A., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Cabrera, I., Carramiñana, A., Castañeda-Martínez, L., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Diaz-Azuara, A., Diaz-Cruz, L., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., Dultzin, D., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., García-Torales, G., Garfias, F., González, A., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Guzmán-Cerón, C., Hampel-Arias, Z., Harding, J. P., Hernández-Cervantes, L., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Langarica, R., Lara, A., Lara, G., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-Garcia, R., Marinelli, A., Martínez, L. A., Martínez, H., Martínez, O., Martínez-Castro, J., Martos, M., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Page, D. P., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ramírez, I., Renter, A., Rivière, C., Rosa-González, D., Ruiz-Sala, F., Ruiz-Velasco, E. L., Ryan, J., Sacahui, J. R., Salazar, H., Salesa, F., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Suarez, F., Taboada, I., Tepe, A., Toale, P. A., Tollefson, K., Torres, I., Tinoco, S., Ukwatta, T. N., Galicia, J. F. Valdés, Vanegas, P., Vázquez, A., Villaseñor, L., Wall, W., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
VAMOS was a prototype detector built in 2011 at an altitude of 4100m a.s.l. in the state of Puebla, Mexico. The aim of VAMOS was to finalize the design, construction techniques and data acquisition system of the HAWC observatory. HAWC is an air-shower array currently under construction at the same site of VAMOS with the purpose to study the TeV sky. The VAMOS setup included six water Cherenkov detectors and two different data acquisition systems. It was in operation between October 2011 and May 2012 with an average live time of 30%. Besides the scientific verification purposes, the eight months of data were used to obtain the results presented in this paper: the detector response to the Forbush decrease of March 2012, and the analysis of possible emission, at energies above 30 GeV, for long gamma-ray bursts GRB111016B and GRB120328B., Comment: Accepted for pubblication in Astroparticle Physics Journal (20 pages, 10 figures). Corresponding authors: A.Marinelli and D.Zaborov
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- 2014
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45. Driving While High
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Dobbs, Page D., Smith, Michael, and Rolfe, David T.
- Published
- 2019
46. Association of psychological distress and current cigarette smoking among Native Hawaiian and Pacific Islander adults and compared to adults from other racial/ethnic groups: Data from the National Health Interview Survey, 2014
- Author
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Marie-Rachelle Narcisse, Sumit K. Shah, Holly C. Felix, Page D. Dobbs, and Pearl A. McElfish
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Cigarette smoking ,Psychological distress ,Native Hawaiian and Pacific Islander adults ,Racial/ethnic disparities ,National Health Interview Survey ,Medicine - Abstract
Cigarette smoking is the leading cause of preventable deaths worldwide. Research has documented an association between psychological distress and smoking among certain racial/ethnic groups but has not examined this association among Native Hawaiian and Pacific Islander (NHPI) adults. Data from the 2014 general and the NHPI-specific National Health Interview Surveys were analyzed at the University of Arkansas for Medical Sciences Regional Campus (Fayetteville, AR) in April 2021 to determine the association between current cigarette smoking and levels of psychological distress among NHPI adults and to assess the difference in the magnitude of that association among NHPI adults compared to adults of other racial/ethnic groups in the United States. The final analytic sample (n = 34,782) included 1,916 NHPI, 20,430 White, 4,725 Black, 2,001 Asian, and 5,710 Hispanic adults. A significant association between current cigarette smoking and psychological distress levels was found among NHPI adults as well as among adults from other racial/ethnic groups. There was no significant difference in the magnitude of the detected association among NHPI adults compared to the magnitude of the same association detected among adults of other racial/ethnic groups. However, this finding indicates race/ethnicity does not moderate the association between psychological distress and current cigarette smoking. Future studies should explore factors that may further explain the variation in current cigarette smoking within and across all racial/ethnic groups.
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- 2022
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47. Collective excitations in neutron-star crusts
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Chamel, N., Page, D., and Reddy, S.
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Astrophysics - High Energy Astrophysical Phenomena ,Nuclear Theory - Abstract
We explore the spectrum of low-energy collective excitations in the crust of a neutron star, especially in the inner region where neutron-proton clusters are immersed in a sea of superfluid neutrons. The speeds of the different modes are calculated systematically from the nuclear energy density functional theory using a Skyrme functional fitted to essentially all experimental atomic mass data., Comment: 5 pages, 1 figure, proceeding of the Nuclear Physics in Astrophysics VI conference, Lisbon, May 19-24 2013
- Published
- 2013
48. Epidemiology of Alcohol Consumption and Societal Burden of Alcoholism and Alcoholic Liver Disease
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Axley, Page D., Richardson, Crit Taylor, and Singal, Ashwani K.
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- 2019
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49. Low-energy collective excitations in the neutron star inner crust
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Chamel, N., Page, D., and Reddy, S.
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Astrophysics - High Energy Astrophysical Phenomena ,Nuclear Theory - Abstract
We study the low-energy collective excitations of the neutron star inner crust, where a neutron superfluid coexists with a Coulomb lattice of nuclei. The dispersion relation of the modes is calculated systematically from a microscopic theory including neutron band structure effects. These effects are shown to lead to a strong mixing between the Bogoliubov-Anderson bosons of the neutron superfluid and the longitudinal crystal lattice phonons. In addition, the speed of the transverse shear mode is greatly reduced as a large fraction of superfluid neutrons are entrained by nuclei. Not only does the much smaller velocity of the transverse mode increase the specific heat of the inner crust, but it also decreases its electron thermal conductivity. These results may impact our interpretation of the thermal relaxation in accreting neutron stars. Due to strong mixing, the mean free path of the superfluid mode is found to be greatly reduced. Our results for the collective mode dispersion relations and their damping may also have implications for neutron star seismology., Comment: 25 pages, 8 figures, revised version
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- 2012
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50. Do Evaporating 4D Black Holes Form Photospheres and/or Chromospheres?
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MacGibbon, Jane H., Carr, B. J., and Page, D. N.
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Astrophysics - High Energy Astrophysical Phenomena ,General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
Several authors have claimed that the observable Hawking emission from a microscopic black hole is significantly modified by the formation of a photosphere or chromosphere around the black hole due to QED or QCD interactions between the emitted particles. Analyzing these models we identify a number of physical and geometrical effects which invalidate them. In all cases, we find that the observational signatures of a cosmic or Galactic background of black holes or an individual black hole remain essentially those of the standard Hawking model, with little change to the detection probability., Comment: Twelfth Marcel Grossmann Meeting, Paris 12 - 18 July 2009; 4 pages; additional references added to arXiv version
- Published
- 2010
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