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"Peterson, John"
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Saudi Arabia under Ibn Saud : economic and financial foundations of the state
At its founding in 1932, the Kingdom of Saudi Arabia was characterized by tribal warfare, political instability, chronic financial shortages and economic crises. As a desert chieftain, Abd al-Aziz Ibn Saud, the ruler and king until 1953, had the skills, the cunning and the power to control the tribes and bring peace to this realm. But financial and economic matters were not his forte and these he left mostly to a single individual, Abdullah al-Sulayman al-Hamdan. He was entrusted with nearly all of the country's early financial dealings and administrative development. This book examines the role of the Ministry of Finance and its minister, Abdullah al-Sulayman, in holding the country together financially and administratively until the promise of substantial oil income was realized a few years after the end of World War II.
Book
Reversing the direction of heat flow using quantum correlations
Heat spontaneously flows from hot to cold in standard thermodynamics. However, the latter theory presupposes the absence of initial correlations between interacting systems. We here experimentally demonstrate the reversal of heat flow for two quantum correlated spins-1/2, initially prepared in local thermal states at different effective temperatures, employing a Nuclear Magnetic Resonance setup. We observe a spontaneous energy flow from the cold to the hot system. This process is enabled by a trade off between correlations and entropy that we quantify with information-theoretical quantities. These results highlight the subtle interplay of quantum mechanics, thermodynamics and information theory. They further provide a mechanism to control heat on the microscale.
The presence of correlations can strongly affect the evolution of a quantum system. Here, the authors directly observe differences in the dynamics of two spins-1/2 systems in an NMR setup depending on the correlations of the initial state, including differences in energy flow and mutual information.
Journal Article
Oman's insurgencies : the sultanate's struggle for supremacy
\"Oman today is a rapidly modernizing and peaceful country on the fringes of a region in turmoil. It does, however, have a long history of internal strife. In the twentieth century, this strife took the form of two internal conflicts.\" \"The Northern Oman or al-Jabal al-Akhdar War of the 1950s was a struggle between the forces of the old tribally based Imamate and the newer Sultanate in the northern part of the country. In the Dhufar War of the 1960s-70s an anti-Sultanate - and later Marxist - front sought secession in the south.\" \"J. E. Peterson takes a detailed look at these two wars in the context of insurgency and counter-insurgency warfare. He surveys Oman's transition from a strictly traditional regime controlling only parts of the country to a modern, inclusive state, particularly in terms of security concerns. Peterson analyses the development of the Sultanate's successful responses to security challenges, especially in the creation and evolution of modern armed forces.\"--Jacket.
Book
High-speed volumetric two-photon fluorescence imaging of neurovascular dynamics
Understanding the structure and function of vasculature in the brain requires us to monitor distributed hemodynamics at high spatial and temporal resolution in three-dimensional (3D) volumes in vivo. Currently, a volumetric vasculature imaging method with sub-capillary spatial resolution and blood flow-resolving speed is lacking. Here, using two-photon laser scanning microscopy (TPLSM) with an axially extended Bessel focus, we capture volumetric hemodynamics in the awake mouse brain at a spatiotemporal resolution sufficient for measuring capillary size and blood flow. With Bessel TPLSM, the fluorescence signal of a vessel becomes proportional to its size, which enables convenient intensity-based analysis of vessel dilation and constriction dynamics in large volumes. We observe entrainment of vasodilation and vasoconstriction with pupil diameter and measure 3D blood flow at 99 volumes/second. Demonstrating high-throughput monitoring of hemodynamics in the awake brain, we expect Bessel TPLSM to make broad impacts on neurovasculature research.
Monitoring hemodynamics in the brain is important in understanding medical imaging data and mechanisms of disease. Here the authors use high-throughput two-photon microscopy with an axially-extended Bessel focus to measure vessel size and blood flow down to capillary scale in the awake mouse brain.
Journal Article
Distributed Acoustic Sensing for Seismic Monitoring of The Near Surface: A Traffic-Noise Interferometry Case Study
Ambient-noise-based seismic monitoring of the near surface often has limited spatiotemporal resolutions because dense seismic arrays are rarely sufficiently affordable for such applications. In recent years, however, distributed acoustic sensing (DAS) techniques have emerged to transform telecommunication fiber-optic cables into dense seismic arrays that are cost effective. With DAS enabling both high sensor counts (“large N”) and long-term operations (“large T”), time-lapse imaging of shear-wave velocity (
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) structures is now possible by combining ambient noise interferometry and multichannel analysis of surface waves (MASW). Here we report the first end-to-end study of time-lapse
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imaging that uses traffic noise continuously recorded on linear DAS arrays over a three-week period. Our results illustrate that for the top 20 meters the
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models that is well constrained by the data, we obtain time-lapse repeatability of about 2% in the model domain—a threshold that is low enough for observing subtle near-surface changes such as water content variations and permafrost alteration. This study demonstrates the efficacy of near-surface seismic monitoring using DAS-recorded ambient noise.
Journal Article
Oman's transformation after 1970
\"Oman's 1970 coup launched a new political and economic structure that was created by and for Sultan Qaboos. The initially haphazard construction matured into a durable structure that continues under Sultan Haitham. This work details the early construction of the Qabusid state in the 1970s-1980s, emphasizing the interplay between personalities and the process of institutionalization. The narrative continues to the present demonstrating the resilience of the Qaboosid system\"-- Provided by publisher.
BOOK
Comparisons of disparities and risks of HIV infection in black and other men who have sex with men in Canada, UK, and USA: a meta-analysis
We did a meta-analysis to assess factors associated with disparities in HIV infection in black men who have sex with men (MSM) in Canada, the UK, and the USA.
We searched Embase, Medline, Google Scholar, and online conference proceedings from Jan 1, 1981, to Dec 31, 2011, for racial comparative studies with quantitative outcomes associated with HIV risk or HIV infection. Key words and Medical Subject Headings (US National Library of Medicine) relevant to race were cross-referenced with citations pertinent to homosexuality in Canada, the UK, and the USA. Data were aggregated across studies for every outcome of interest to estimate overall effect sizes, which were converted into summary ORs for 106 148 black MSM relative to 581 577 other MSM.
We analysed seven studies from Canada, 13 from the UK, and 174 from the USA. In every country, black MSM were as likely to engage similarly in serodiscordant unprotected sex as other MSM. Black MSM in Canada and the USA were less likely than other MSM to have a history of substance use (odds ratio, OR, 0·53, 95% CI 0·38–0·75, for Canada and 0·67, 0·50–0·92, for the USA). Black MSM in the UK (1·86, 1·58–2·18) and the USA (3·00, 2·06–4·40) were more likely to be HIV positive than were other MSM, but HIV-positive black MSM in each country were less likely (22% in the UK and 60% in the USA) to initiate combination antiretroviral therapy (cART) than other HIV-positive MSM. US HIV-positive black MSM were also less likely to have health insurance, have a high CD4 count, adhere to cART, or be virally suppressed than were other US HIV-positive MSM. Notably, despite a two-fold greater odds of having any structural barrier that increases HIV risk (eg, unemployment, low income, previous incarceration, or less education) compared with other US MSM, US black MSM were more likely to report any preventive behaviour against HIV infection (1·39, 1·23–1·57). For outcomes associated with HIV infection, disparities were greatest for US black MSM versus other MSM for structural barriers, sex partner demographics (eg, age, race), and HIV care outcomes, whereas disparities were least for sexual risk outcomes.
Similar racial disparities in HIV and sexually transmitted infections and cART initiation are seen in MSM in the UK and the USA. Elimination of disparities in HIV infection in black MSM cannot be accomplished without addressing structural barriers or differences in HIV clinical care access and outcomes.
None.
Journal Article
Experimental assessment of physical realism in a quantum-controlled device
Bohr’s complementarity principle has been challenged by quantum delayed-choice experiments wherein quantum systems are claimed to behave neither as wave nor as a particle, but in an intermediary way. However, this conclusion has been supported by retro-inference and with no direct link with the system quantum state. Here, we consider a framework that employs an operational criterion of physical reality to diagnosis the system ontology directly from the quantum state at each instant of time. We show that, in disparity with previous proposals, our setup ensures a formal link between the output visibility and elements of reality within the interferometer. An experimental proof-of-principle is provided for a two-spin-1/2 system in an interferometric setup implemented in a nuclear magnetic resonance platform. We discuss how our results validate, to a great extent, Bohr’s original formulation of the complementarity principle and unveil morphing reality states.
The concept of wave-particle duality is at the core of quantum mechanics principles but has seen an element of questioning with recent experiments were overlapping behaviours have been observed. The authors propose and experimentally implement a wave-particle duality experiment in a quantum-controlled interferometer concluding that wave and particle realities can never manifest themselves simultaneously.
Journal Article