Stability of a Novel Intraocular Lens Design: Comparison of Two Trifocal Lenses

PURPOSE: To compare visual outcomes, rotational stability, and centration in a randomized controlled trial in patients undergoing cataract surgery who were bilaterally implanted with two different trifocal intraocular lenses (IOLs) with a similar optical zone but different haptic shape. METHODS: Twenty-one patients (42 eyes) with cataract and less than 1.50 D of corneal astigmatism underwent implantation of one FineVision/MicoF IOL in one eye and one POD FineVision IOL in the contralateral eye (PhysIOL, Liège, Belgium) at IOA Madrid Innova Ocular, Madrid, Spain. IOL allocation was random. Outcome measures, all evaluated 3 months postoperatively, included monocular and binocular uncorrected distance (UDVA), corrected distance (CDVA), distance-corrected intermediate (DCIVA), and near (DCNVA) visual acuity (at 80, 40, and 25 cm) under photopic conditions, refraction, IOL centration, haptic rotation, dysphotopsia, objective quality of vision and aberration quantification, patient satisfaction, and spectacle independence. RESULTS: Three months postoperatively, mean monocular UDVA, CDVA, DCIVA, and DCNVA (40 cm) under photopic conditions were 0.04 ± 0.07, 0.01 ± 0.04, 0.15 ± 0.11, and 0.16 ± 0.08 logMAR for the eyes implanted with the POD FineVision IOL and 0.03 ± 0.05, 0.01 ± 0.02, 0.17 ± 0.12, and 0.14 ± 0.08 logMAR for those receiving the FineVision/MicroF IOL. Moreover, the POD FineVision IOL showed similar centration (P > .05) and better rotational stability (P < .05) than the FineVision/MicroF IOL. Regarding halos, there was a minimal but statistically significant difference, obtaining better results with FineVision/MicroF. Full spectacle independence was reported by all patients. CONCLUSIONS: This study revealed similar visual outcomes for both trifocal IOLs under test (POD FineVision and FineVision/MicroF). However, the POD FineVision IOL showed better rotational stability, as afforded by its design.

Patterns and Predictors of Stability and Change in Representations of Romantic Relationships in Adolescence and Young Adulthood

Research on the stability of attachment representations across the lifespan has led to two alternative perspectives: the prototype and revisionist perspectives (Fraley, 2002). The prototype perspective posits that there is a stable factor underlying fluctuations in representations and the revisionist perspective argues that there is no inherently stable factor. The current study employed a latent trait-state model to investigate these alternative models of stability and change in representations of romantic relationships in adolescence and young adulthood. The study also sought to identify individual characteristics and relationship experiences that are associated with changes in representations. In a sample of 200 participants, representations were assessed by interview and self-report over seven measurement occasions between ages 15 and 23. Results were consistent with the prototype perspective emphasizing that a stable, latent factor exerts a consistent influence over the lifespan. In addition to a stable component, representations incorporated a component that varies over time. Findings showed that this fluctuating component of representations was associated with internalizing and externalizing symptomatology as well as experiences of support and negative interaction in relationships.

The Caregiver–Child Relationship, Youth Mental Health, and Placement Stability in a Child Welfare Sample

Objective: Healthy relationships between adolescents and their caregivers have been robustly associated with better youth outcomes in a variety of domains. Youth in contact with the child welfare system are at higher risk for worse outcomes including mental health problems and home placement instability. A growing body of literature points to youth mental health problems as both a predictor and a consequence of home placement instability in this population; the present study aimed to expand our understanding of these phenomena by examining the interplay among the caregiver-child relationship, youth mental health symptoms, and placement change over time. Method: The sample consisted of 1,179 youths aged 11-16, from the National Survey of Child and Adolescent Well-Being, a nationally representative sample of children in contact with the child welfare system. We used bivariate correlations and autoregressive cross-lagged path analysis to examine how youths’ reports of their externalizing and internalizing symptoms, their relationship with their caregivers, and placement changes reciprocally influenced one another over three time points. Results: In the overall models, early internalizing symptoms significantly negatively predicted the quality of the caregiver-child relationship at the next time point, and early externalizing symptoms predicted subsequent placement change. In addition, later externalizing symptoms negatively predicted subsequent reports of relationship quality, and later placement changes predicted subsequent externalizing problems; these relationships were significant only at the trend level (p < .10). The quality of the relationship was significantly negatively correlated with externalizing and internalizing problems at all time points, and all variables demonstrated autoregressive stability over time. Conclusions: Our findings support the importance of comprehensive interventions for youth in contact with the child welfare system, which target not only youth symptoms in isolation, but also the caregiver-child relationship, as a way to improve social-emotional outcomes in this high-risk population.

Nostalgic representation of reality in television fiction: an empirical study based on the analysis of the Spanish television series Cuéntame cómo pasó

The Spanish transition from dictatorship to democracy is often described as an example of negotiation or agreement between the elites (Sánchez Cuenca and Aguilar, 2009: 433). Journalistic and political elites, aware of their important historical role, agreed a consensus on certain issues (democracy, constitution, amnesty) or characters (King Juan Carlos I), in order to ensure the stability of the democratic process (Zugasti, 2007, 2008). Television, which articulates the discourse of the masses, has been one of the basic means used to illustrate the development. Among the highlights of recent major audiovisual content, Cuéntame cómo pasó (2001-present) -a TV-series designed to explain changes with a nostalgic tone in Spanish society since 1968 until today- stands out. By choosing a random sample of episodes for this research we propose to verify the validity of the representation of the political process which contextualizes the series. By analyzing many elements, such as the opinions of the main characters, their personal, political and geographical situations, we try to show the construction of a focal point that sanctifies the official version. We also stress the pacifying and nostalgic tone, which constructs stereotypes and taboos about the process and which characterizes this series as a symbolic culmination of the democratization undertaken by the elites.

Characterization and ageing study of poly(lactic acid) films plasticized with oligomeric lactic acid

Poly(lactic acid) (PLA) was melt-blended with a bio-based oligomeric lactic acid (OLA) plasticizer at different concentrations between 15 wt% and 25 wt% in order to enhance PLA ductility and to get a fully biodegradable material with potential application in films manufacturing. OLA was an efficient plasticizer for PLA, as it caused a significant decrease on glass transition temperature (Tg) while improving considerably ductile properties. Only one Tg value was observed in all cases and no apparent phase separation was detected. Films obtained by compression moulding were stored during 3 months under ambient controlled conditions and thermal, mechanical, structural and oxygen barrier properties were studied in order to evaluate the stability of the PLA–OLA films over time. Blends with 20 and 25 wt% OLA remained stable and compatible with PLA within the ageing period. Besides, PLA–20 wt% OLA formulation was the only one which maintained its amorphous state with adequate thermal, mechanical and oxygen barrier properties for flexible films manufacturing.

Seismic behavior of a masonry chimney with severe cracking condition: preliminary study

This paper presents a structural analysis of a masonry chimney built in the 1940s, which is currently being cataloged as local interest heritage. This structure has not served any industrial purpose for the last thirty years. The chimney is located in the town of Agost (Alicante - Spain) and directly exposed to the prevailing winds from the sea, as it is approximately 12 km away from the waterfront and there are not any significant barriers, which could protect the structure against the wind. There are longitudinal cracks and fissures all along the shaft because of the chimney’s geometrical characteristics, the effect of the masonry creep and especially the lack of maintenance. Moreover, there is also a permanent bending deformation in the upper 1/3 of the height due to the wind pressure. A numerical analysis for the static behavior against gravity and wind loads was performed using the structure’s current conditions after a detailed report of its geometry, its construction system and the cracking pattern. Afterwards, the dynamic behavior was studied, i.e. a seismic analysis using both response spectra and accelerograms in order to examine the structural stability. This work shows the pre-monitoring analysis before any experimental testing. Using the current results the future test conditions will be determined (e.g. number of sensors and monitoring point location, excitation systems, etc) prior to a possible structural reinforcement by applying composite material (fiber reinforced polymers).

Study of zinc protein ligands in a halophilic enzyme

Glucose dehydrogenase (EC 1.1.1.47) from the halophilic Archaeon Haloferax mediterranei belongs to the medium-chain alcohol dehydrogenase superfamily and requires a zinc ion for catalysis. The zinc ion is coordinated by a histidine, a water molecule and two other ligands from the protein or the substrate, which vary during the catalytic cycle of the enzyme. In many enzymes of this superfamily one of the zinc ligands is commonly cysteine, which is replaced by an aspartate residue at position 38 in the halophilic enzyme. This change has been only observed in glucose dehydrogenases from extremely halophilic microorganisms belonging to the Archaea Domain. This paper describes biochemical studies and structural comparisons to analyze the role of sequence differences between thermophilic and halophilic glucose dehydrogenases which contain a zinc ion within the protein surrounded by three ligands. Whilst the catalytic activity of the D38C GlcDH mutant is reduced, its thermal stability is enhanced, consistent with the greater structural similarity between this mutant and the homologous thermophilic enzyme from Thermoplasma acidophilum.

Stability in Linear Optimization Under Perturbations of the Left-Hand Side Coefficients

This paper studies stability properties of linear optimization problems with finitely many variables and an arbitrary number of constraints, when only left hand side coefficients can be perturbed. The coefficients of the constraints are assumed to be continuous functions with respect to an index which ranges on certain compact Hausdorff topological space, and these properties are preserved by the admissible perturbations. More in detail, the paper analyzes the continuity properties of the feasible set, the optimal set and the optimal value, as well as the preservation of desirable properties (boundedness, uniqueness) of the feasible and of the optimal sets, under sufficiently small perturbations.

Performance Assessment of a Polymer Electrolyte Membrane Electrochemical Reactor under Alkaline Conditions – A Case Study with the Electrooxidation of Alcohols

A novel polymer electrolyte membrane electrochemical reactor (PEMER) configuration has been employed for the direct electrooxidation of propargyl alcohol (PGA), a model primary alcohol, towards its carboxylic acid derivatives in alkaline medium. The PEMER configuration comprised of an anode and cathode based on nanoparticulate Ni and Pt electrocatalysts, respectively, supported on carbonaceous substrates. The electrooxidation of PGA was performed in 1.0 M NaOH, where a cathode based on a gas diffusion electrode was manufactured for the reduction of oxygen in alkaline conditions. The performance of a novel alkaline anion-exchange membrane based on Chitosan (CS) and Poly(vinyl) alcohol (PVA) in a 50:50 composition ratio doped with a 5 wt.% of poly (4-vinylpyridine) organic ionomer cross-linked, methyl chloride quaternary salt resin (4VP) was assessed as solid polymer electrolyte. The influence of 4VP anionic ionomer loading of 7, 12 and 20 wt.% incorporated into the electrocatalytic layers was examined by SEM and cyclic voltammetry (CV) upon the optimisation of the electroactive area, the mechanical stability and cohesion of the catalytic ink onto the carbonaceous substrate for both electrodes. The performance of the 4VP/CS:PVA membrane was compared with the commercial alkaline anion-exchange membrane FAA −a membrane generally used in direct alcohol alkaline fuel cells- in terms of polarisation plots in alkaline conditions. Furthermore, preparative electrolyses of the electrooxidation of PGA was performed under alkaline conditions of 1 M NaOH at constant current density of 20 mA cm−2 using a PEMER configuration to provide proof of the principle of the feasibility of the electrooxidation of other alcohols in alkaline media. PGA conversion to Z isomers of 3-(2-propynoxy)-2-propenoic acid (Z-PPA) was circa 0.77, with average current efficiency of 0.32. Alkaline stability of the membranes within the PEMER configuration was finally evaluated after the electrooxidation of PGA.

The Judicial ‘Bail Out’ of the European Stability Mechanism: Comment on the Pringle Case. Research Paper in Law 09/2013

Since the beginning of the crisis, many responses have been taken to stabilise the European markets. Pringle is the awaited judicial response of the European Court of Justice on the creation of the European Stability Mechanism (ESM), a crisis-related intergovernmental international institution which provides financial assistance to Member States in distress in the Eurozone. The judgment adopts a welcome and satisfactory approach on the establishment of the ESM. This article examines the feasibility of the ESM under the Treaty rules and in light of the Pringle judgment. For the first time, the Court was called to appraise the use of the simplified revision procedure under article 48 TEU with the introduction of a new paragraph to article 136 TFEU as well as to interpret the no bail out clause under article 125 TFEU. The final result is rather positive as the Court endorses the establishment of a stability mechanism of the ESM-kind beyond a strict reading of the Treaty rules. Pringle is the first landmark ECJ decision in which the Court has endorsed the use of new and flexible measures to guarantee financial assistance between Member States. This judgment could act as a springboard for more economic, financial and, possibly, political interconnections between Member States.

Hostages to Moscow, clients of Beijing. Security in Central Asia as the role of the West diminishes. OSW Study 10/2014

The goal of this publication is to attempt to assess the thirteen years (2001- -2014) of the West’s military presence in the countries of post-Soviet Central Asia, closely associated with the ISAF and OEF-A (Operation Enduring Freedom – Afghanistan) missions in Afghanistan. There will also be an analysis of the actual challenges for the region’s stability after 2014. The current and future security architecture in Central Asia will also be looked at closely, as will the actual capabilities to counteract the most serious threats within its framework. The need to separately handle the security system in Central Asia and security as such is dictated by the particularities of political situation in the region, the key mechanism of which is geopolitics understood as global superpower rivalry for influence with a secondary or even instrumental role of the five regional states, while ignoring their internal problems. Such an approach is especially present in Russia’s perception of Central Asia, as it views security issues in geopolitical categories. Because of this, security analysis in the Central Asian region requires a broader geopolitical context, which was taken into account in this publication. The first part investigates the impact of the Western (primarily US) military and political presence on the region’s geopolitical architecture between 2001 and 2014. The second chapter is an attempt to take an objective look at the real challenges to regional security after the withdrawal of the coalition forces from Afghanistan, while the third chapter is dedicated to analysing the probable course of events in the security dimension following 2014. The accuracy of predictions time-wise included in the below publication does not exceed three to five years due to the dynamic developments in Central Asia and its immediate vicinity (the former Soviet Union, Afghanistan, Pakistan, Iran), and because of the large degree of unpredictability of policies of one of the key regional actors – Russia (both in the terms of its activity on the international arena, and its internal developments).

Turcja - korytarz transzytowy dla surocow energetycznych do UE? Prace OSW 17/2005. = Turkey - an energy transit corridor to the EU? OSW Study 17/2005

1. The priority of Ankara's energy policy is to make Turkey an important transit corridor for energy resources transported to the EU. Turkey wishes to play an active role in the distribution and sale of gas and oil flowing across its territory. 2. Transit and sale of energy resources, and gas in particular, are expected to provide a major source of income for Turkey and a tool by which Ankara will be able to build its position in the region and in Europe. 3. Since Turkey is an EU candidate country, Brussels will probably welcome Turkey's role as a transit corridor as much as Ankara will. 4. The success of Ankara's energy strategy hinges on developments in Turkey's internal energy market. 5. It also depends on a number of external factors including: - Export policies and internal situation in producer countries. Most importantly, it depends on: a. Russia and its energy policy priorities b. Stability in the Middle East. - Policies of consumer countries, including the EU in particular. - Policies of world powers present in the region (USA).

Kazakhstan: the regional success story; Tajikistan: a trial period; Uzbekistan: the major source of instability in Central Asia? OSW Study 15/2004

Kazakhstan: Kazakhstan can boast economic development like no other country in Central Asia. In contrast to other countries of the region, which have rich natural resources, Kazakhstan has managed to use its economic potential in a way that yields concrete benefits now and, at the same time, creates prospects for further sustainable economic growth. Tajikistan: Tajikistan in its present state has been built on the civil war experiences and provisions of the peace accords signed in 1997. These have had a great impact on the present form of the state, its political scene and power mechanisms. President Emomali Rakhmonov is the central figure in the state. The political system, which he has cocreated, is based on - unique in this region - political pluralism (the existence of the Islamic party), decentralisation (far-going independence of the regions and relatively limited potential of the central structures) and compromise as the basic way of resolving conflicts. Such a system has so far guaranteed stabilisation and normalisation of the country. Uzbekistan: With its geographic location, potential, ambitions and political priorities, Uzbekistan could play a leading role in Central Asia. The international community has perceived the country as the pillar of stability in the region. This perception was further reinforced after 11th September 2001 and was certainly among the factors that inspired the United States to start closer political and military cooperation with Tashkent. The administration in Washington had expected that closer contacts might galvanise political, economic and social change in Uzbekistan, thus reinforcing positive trends in other countries of the region as well. But the relations between Washington and Tashkent are in crisis (which the United States will certainly try to overcome), and we have seen rapprochement between Uzbekistan and Russia and China.

The 'tribal areas' of the Caucasus: The North Caucasus - an enclave of 'alien civilisation' within the Russian Federation. OSW Study 34/2010

Militant Islam is currently the greatest threat to security and stability in the Russian part of the Caucasus. However, even though the armed Islamic underground is capable of organising terrorist attacks and carrying out actions of sabotage, it seems too weak to bring about any change in the Caucasus’s political status quo. Besides, militant Islam is merely a symptom (albeit the most radical and spectacular) of a much wider process, namely the widening civilisational gap between Russia and the North Caucasus, initiated by the collapse of the Soviet Union. The key elements of this process are as follows: the spontaneous re-Islamisation of social life and the dynamic growth of Islam's political influence; the de-Russification of the region; and the ongoing marginalisation of secular intellectuals. As a result, the North Caucasus, and principally Chechnya, Ingushetia and Dagestan, are turning into an enclave separated from the rest of the Russian Federation by a growing civilisational gap, and becoming increasingly different from the rest of Russia. This situation may recall the tribal areas of Pakistan inhabited by Pashtuns (FATA) along the Afghan border.

Russia's best ally: The situation of the Russian oil sector and forecast for its future. OSW Study 39/2012

Oil is a strategic raw material for Russia and one of fundamental significance for the functioning of the state and its future. Taxes on oil production and exports are the most important source of state budget revenues which guarantee Russia maintains its political and economic stability. Russia is building its international position on the basis of its vast raw material and energy potential. While a great number of various publications have been devoted to Russian gas and Gazprom, surprisingly little research has been done into the present condition and possible future developments of the Russian oil sector, despite the fact that oil has and will have a much greater impact than gas on the functioning and the future of Russia. The main objective of this text is to describe the present situation of the Russian oil sector, its problems and the challenges it is posing, as well as the government’s policy towards this key branch of the Russian economy. This will be an introduction to an attempt to answer to the questions about the possible future production and the export levels of Russian oil, also broken down into the European and Asian directions.