The Cyprus Institute

About: The Cyprus Institute is a other organization based out in Nicosia, Cyprus. It is known for research contribution in the topics: Aerosol & Environmental science. The organization has 418 authors who have published 1252 publications receiving 32586 citations.

Should thermostatted ring polymer molecular dynamics be used to calculate thermal reaction rates

Abstract: We apply Thermostatted Ring Polymer Molecular Dynamics (TRPMD), a recently proposed approximate quantum dynamics method, to the computation of thermal reaction rates. Its short-time transition-state theory limit is identical to rigorous quantum transition-state theory, and we find that its long-time limit is independent of the location of the dividing surface. TRPMD rate theory is then applied to one-dimensional model systems, the atom-diatom bimolecular reactions H + H2, D + MuH, and F + H2, and the prototypical polyatomic reaction H + CH4. Above the crossover temperature, the TRPMD rate is virtually invariant to the strength of the friction applied to the internal ring-polymer normal modes, and beneath the crossover temperature the TRPMD rate generally decreases with increasing friction, in agreement with the predictions of Kramers theory. We therefore find that TRPMD is approximately equal to, or less accurate than, ring polymer molecular dynamics for symmetric reactions, and for certain asymmetric systems and friction parameters closer to the quantum result, providing a basis for further assessment of the accuracy of this method.

A pilot quality improvement intervention in patients with diabetes and hypertension in primary care settings of Cyprus

Abstract: Methods. In a two-arm non-randomized controlled study in primary care centres in Cyprus, all patients with hypertension (HTN) and diabetes (n = 539) were invited. In one urban and one rural centre, a quality improvement programme was implemented; two other centres (one urban and one rural) served as control practices. The intervention mainly consisted of the introduction of clinical disease management guidelines and an electronic medical record system. The primary outcome measurement was improvement of specific clinical indicators for HTN and diabetes. Patients’ satisfaction was evaluated using the European Task Force on Patient Evaluations of General Practice (EUROPEP) questionnaire over an 18-month follow-up period. Results. Five hundred and four patients completed the study, 278 patients in the intervention practices and 226 patients in the control practices. Mean results for blood pressure, total cholesterol and low density lipoprotein-cholesterol and three annual performance measures (urine protein testing, dilated eye and foot examination) had improved at 18-month follow-up in the intervention as compared to the control group. There was no improvement of HbA1c levels. Patients’ satisfaction improved in the intervention practices (improvement of 10/23 EUROPEP items) but decreased in the control group (decline of 20/23 items). Conclusions. A pilot multifaceted quality improvement intervention programme for patients with diabetes and HTN implemented in primary care settings in Cyprus showed promising results. Future studies need to involve a broader number of practices and patient populations.

Uncertainties in estimates of mortality attributable to ambient PM2.5 in Europe

Abstract: The assessment of health impacts associated with airborne particulate matter smaller than 2.5 μm in diameter (PM2.5) relies on aerosol concentrations derived either from monitoring networks, satellite observations, numerical models, or a combination thereof. When global chemistry-transport models are used for estimating PM2.5, their relatively coarse resolution has been implied to lead to underestimation of health impacts in densely populated and industrialized areas. In this study the role of spatial resolution and of vertical layering of a regional air quality model, used to compute PM2.5 impacts on public health and mortality, is investigated. We utilize grid spacings of 100 km and 20 km to calculate annual mean PM2.5 concentrations over Europe, which are in turn applied to the estimation of premature mortality by cardiovascular and respiratory diseases. Using model results at a 100 km grid resolution yields about 535 000 annual premature deaths over the extended European domain (242 000 within the EU-28), while numbers approximately 2.4% higher are derived by using the 20 km resolution. Using the surface (i.e. lowest) layer of the model for PM2.5 yields about 0.6% higher mortality rates compared with PM2.5 averaged over the first 200 m above ground. Further, the calculation of relative risks (RR) from PM2.5, using 0.1 μg m−3 size resolution bins compared to the commonly used 1 μg m−3, is associated with ±0.8% uncertainty in estimated deaths. We conclude that model uncertainties contribute a small part of the overall uncertainty expressed by the 95% confidence intervals, which are of the order of ±30%, mostly related to the RR calculations based on epidemiological data.

PM2.5 characterization of primary and secondary organic aerosols in two urban-industrial areas in the East Mediterranean

Abstract: Primary and secondary organic aerosols in PM2.5 were investigated over a one-year campaign at Zouk Mikael and Fiaa, Lebanon. The n-alkanes concentrations were quite similar at both sites (26-29 ng/m3) and mainly explained by anthropogenic emissions rather than natural ones. The concentrations of total Polycyclic Aromatic Hydrocarbons (PAHs) were nearly three times higher at Zouk Mikael (2.56 ng/m3) compared to Fiaa (0.95 ng/m3), especially for indeno[1,2,3-c,d]pyrene linked to the presence of the power plant. A characteristic indeno[1,2,3-c,d]pyrene/(indeno[1,2,3-c,d]pyrene + benzo[g,h,i]perylene) ratio in the range 0.8-1.0 was determined for heavy fuel oil combustion from the power plant. Fatty acids and hopanes were also investigated and were assigned to cooking activities and vehicular emissions respectively. Phthalates were identified for the first time in Lebanon with high concentrations at Zouk and Fiaa (106.88 and 97.68 ng/m3 respectively). Moreover, the biogenic secondary aerosols revealed higher concentrations in summer. The total terpene concentration varied between 131 ng/m3 at Zouk Mikael in winter to 469 ng/m3 at Fiaa in summer. Additionnally, the concentrations of the dicarboxylic acids especially for adipic and phthalic acids were more influenced by anthropogenic sources.The analysis of molecular markers and diagnostic ratios indicated that the sites were strongly affected by anthropogenic sources such as waste open burning, diesel private generators, cooking activities, road transport, power plant, and industrial emissions. Moreover, results showed different pattern during winter and summer seasons. Whereas, higher concentrations of biogenic markers were clearly encountered during the summer period.

Seamen on Land? A Preliminary Analysis of Medieval Ship Graffiti on Cyprus

Abstract: This article reports on the results of a research project entitled ‘KARAVOI. The Ship Graffiti on the Medieval Monuments of Cyprus: Mapping, Documentation and Digitisation’, during which 233 ship graffiti were recorded in 44 different monuments on the island, dating from the 15th to the 20th centuries. Innovative recording techniques have been used to mitigate the effects of the subjective or partial recording of graffiti lines on tracing paper. Apart from the study of ship graffiti as iconographic sources, particular emphasis has been given to their geographical and social context through a comprehensive analysis of the graffiti types and their spatial distribution in the monuments as well as the monuments location on the island.