Secrecy, Conspiracy, and the Media During the CIA-Contra Affair

In 1996, Gary Webb and the San Jose Mercury News unleashed a media firestorm over his “Dark Alliance” series of newspaper articles, which detailed CIA involvement in the Los Angeles crack cocaine epidemic in the 1980s. The series alleged that a drug ring in L.A. sold tons of crack to a primarily African-American population in the city, with profits then smuggled back to Nicaragua to a group of CIA-backed Contras. The series resulted in four separate investigations into CIA wrongdoing, including one by the U.S. Senate Subcommittee on Terrorism, Narcotics, and International Operations, which concluded that there were “serious questions as to whether or not US officials… failed to address the drug issue for fear of jeopardizing the war against Nicaragua.”[1] I argue that the Dark Alliance, although flawed due to some exaggerated claims of causality, represents an important case study in press and CIA accountability and the ways in which newscraft and statecraft intersect. This thesis examines the validity of Webb’s claims of CIA wrongdoing, as well as the press coverage of the events of the series. Additionally, this thesis studies the effects of the crack cocaine epidemic on Los Angeles communities and how that drove conspiratorial beliefs after the publication of the Dark Alliance; largely because of Reagan-era drug enforcement policies and structural vulnerabilities within these communities, African-Americans were severely affected by the impact of crack cocaine, compounding conspiratorial beliefs. Finally, this thesis discusses the overarching themes of secrecy and conspiracy, including the ways in which mass media can play contradictory roles in the production of ‘public opinion’

How to account for Inuit ancestry in lung function prediction

Rigorous lung function prediction equations for the Inuit are lacking. We used spirometry from 351 Inuit and 29 people of other ancestry obtained during an occupational survey in Greenland to determine how to obtain valid lung function predictions for the Inuit using Global Lung Function Initiative (GLI) equations for Europeans. Standing height for the Inuit was used in the predictions as well as their height modified in line with the known differences in standing to sitting height ratio (SHR) for the Inuit. With recorded height in predicting lung function, mean±SD Inuit z-scores for FVC and FEV1 were significantly higher than predicted (0.81±1.20 and 0.53±1.36, respectively, p<0.0001) which was not true for the non-Inuit participants (-0.01±1.04 and 0.15±1.17, respectively). When using height modified for SHR the mean±SD Inuit z-scores for FVC and FEV1 were no longer significantly different from predicted (0.10±1.10 and -0.12±1.24, respectively). The mean±SD Inuit FEV1/FVC z-scores were not significantly different from the non-Inuit, being respectively -0.45±0.98 and -0.01±1.04. Modified height changed the mean±SD Inuit FEV1/FVC z-scores to -0.39±0.99. Representative lung function predictions from GLI equations can be made for Inuit by using standing height modified for the known differences in SHR between Inuit and those of European ancestr

c-Axis tunneling in YBa2Cu3O7-\delta/PrBa2Cu3O7-\delta superlattices

In this work we report c-axis conductance measurements done on a superlattice based on a stack of 2 layers YBa2Cu3O{7-\delta} and 7 layers PrBa2Cu3O{7-\delta} (2:7). We find that these quasi-2D structures show no clear superconducting coupling along the c-axis. Instead, we observe tunneling with a gap of \Delta_c=5.0\pm 0.5 meV for the direction perpendicular to the superconducting planes. The conductance spectrum show well defined quasi-periodic structures which are attributed to the superlattice structure. From this data we deduce a low temperature c-axis coherence length of \xi_c=0.24\pm 0.03 nm.Comment: 15 pages, 5 figures. To appear in Phys.Rev.

High mobility transport in isotopically-enriched 12^{12}C and 13^{13}C exfoliated graphene

Graphene quantum dots are promising candidates for qubits due to weak spin-orbit and hyperfine interactions. The hyperfine interaction, controllable via isotopic purification, could be the key to further improving the coherence. Here, we use isotopically enriched graphite crystals of both $^{12}$C and $^{13}$C grown by high-pressure-high-temperature method to exfoliate graphene layers. We fabricated Hall bar devices and performed quantum transport measurements, revealing mobilities exceeding $10^{5}$$\textrm{cm}^{2}/Vs$ and a long mean free path of microns, which are as high as natural graphene. Shubnikov-de Haas oscillations, quantum Hall effect up to the filling factor of one, and Brown-Zak oscillations due to the alignment of hBN and graphene are observed thanks to the high mobility. These results constitute a material platform for physics and engineering of isotopically-enriched graphene qubits.Comment: 6 pages, 2 figure

Social Media and Access to Drugs Online : A Nationwide Study in the United States and Spain among Adolescents and Young Adults

Drugs are sold on both dark web services and on social media, but research investigating these drug purchases online is still emerging. The aim of this study is to analyze risk factors associated with buying drugs online. Utilizing theories of criminology and addiction research, it was hypothesized that social bonds, low levels of self-control, and poor mental health are associated with buying drugs online. Additionally, it was predicted that purchases of drugs online would mediate the relationship between low self-control and regular drug use. Participants of this nationwide study were 15 to 25 years old living in the United States (N= 1,212) and Spain (N= 1,212). Measures of impulsivity, a sense of mastery, social belonging, psychological distress, excessive behaviors (drinking, gambling and internet use) were utilized to predict purchasing drugs online. Two percent of the U.S. and Spanish respondents reported buying drugs online with 77% of them utilizing social media services to buy drugs. Results from multinomial logistic regression, penalized maximum-likelihood logistic regression, and binary mediation regression models indicated that buying drugs online was associated with lower self-control, higher psychological distress, and excessive gambling behavior and excessive Internet use. Having online friends was not a risk factor, but having strong social bonds with offline friends served as a protective factor. Additionally, buying drugs online mediated the relationship between low self-control and regular use of drugs. Results indicate that more focus should be placed on mainstream social media services as sources of drug acquisition as online drug buyers have multiple self-control and mental health problems.Peer reviewe