Local probe of fractional edge states of S=1 Heisenberg spin chains

Spin chains are among the simplest physical systems in which electron-electron interactions induce novel states of matter. Here we propose to combine atomic scale engineering and spectroscopic capabilities of state of the art scanning tunnel microscopy to probe the fractionalized edge states of individual atomic scale S=1 spin chains. These edge states arise from the topological order of the ground state in the Haldane phase. We also show that the Haldane gap and the spin-spin correlation length can be measured with the same technique.

Measuring color differences in automotive samples with lightness flop: a test of the AUDI2000 color-difference formula

From a set of gonioapparent automotive samples from different manufacturers we selected 28 low-chroma color pairs with relatively small color differences predominantly in lightness. These color pairs were visually assessed with a gray scale at six different viewing angles by a panel of 10 observers. Using the Standardized Residual Sum of Squares (STRESS) index, the results of our visual experiment were tested against predictions made by 12 modern color-difference formulas. From a weighted STRESS index accounting for the uncertainty in visual assessments, the best prediction of our whole experiment was achieved using AUDI2000, CAM02-SCD, CAM02-UCS and OSA-GP-Euclidean color-difference formulas, which were no statistically significant different among them. A two-step optimization of the original AUDI2000 color-difference formula resulted in a modified AUDI2000 formula which performed both, significantly better than the original formula and below the experimental inter-observer variability. Nevertheless the proposal of a new revised AUDI2000 color-difference formula requires additional experimental data.

Difference schemes for numerical solutions of lagging models of heat conduction

Non-Fourier models of heat conduction are increasingly being considered in the modeling of microscale heat transfer in engineering and biomedical heat transfer problems. The dual-phase-lagging model, incorporating time lags in the heat flux and the temperature gradient, and some of its particular cases and approximations, result in heat conduction modeling equations in the form of delayed or hyperbolic partial differential equations. In this work, the application of difference schemes for the numerical solution of lagging models of heat conduction is considered. Numerical schemes for some DPL approximations are developed, characterizing their properties of convergence and stability. Examples of numerical computations are included.

Electrochemical synthesis at pre-pilot scale of 1-phenylethanol by cathodic reduction of acetophenone using a solid polymer electrolyte

The pre-pilot scale synthesis of 1-phenylethanol was carried out by the cathodic hydrogenation of acetophenone in a 100 cm2 (geometric area) Polymer Electrolyte Membrane Electrochemical Reactor. The cathode was a Pd/C electrode. Hydrogen oxidation on a gas diffusion electrode was chosen as anodic reaction in order to take advantage of the hydrogen evolved during the reduction. This hydrogen oxidation provides the protons needed for the synthesis. The synthesis performed with only a solid polymer electrolyte, spe, has lower fractional conversion although a higher selectivity than that carried out using a support–electrolyte–solvent together with a spe. However, the difference between these two cases is rather small and since the work-up and purification of the final product are much easier when only a spe is used, this last process was chosen for the pre-pilot electrochemical synthesis of 1-phenylethanol.

Difference schemes for time-dependent heat conduction models with delay

Different non-Fourier models of heat conduction, that incorporate time lags in the heat flux and/or the temperature gradient, have been increasingly considered in the last years to model microscale heat transfer problems in engineering. Numerical schemes to obtain approximate solutions of constant coefficients lagging models of heat conduction have already been proposed. In this work, an explicit finite difference scheme for a model with coefficients variable in time is developed, and their properties of convergence and stability are studied. Numerical computations showing examples of applications of the scheme are presented.

Influence of the Difference Between Corneal and Refractive Astigmatism on LASIK Outcomes Using Solid-State Technology

Purpose: To evaluate the influence of the difference between preoperative corneal and refractive astigmatism [ocular residual astigmatism (ORA)] on outcomes obtained after laser in situ keratomileusis (LASIK) surgery for correction of myopic astigmatism using the solid-state laser technology. Methods: One hundred one consecutive eyes with myopia or myopic astigmatism of 55 patients undergoing LASIK surgery using the Pulzar Z1 solid-state laser (CustomVis Laser Pty Ltd, currently CV Laser) were included. Visual and refractive changes at 6 months postoperatively and changes in ORA and anterior corneal astigmatism and posterior corneal astigmatism (PCA) were analyzed. Results: Postoperatively, uncorrected distance visual acuity improved significantly (P < 0.01). Likewise, refractive cylinder magnitude and spherical equivalent were reduced significantly (P < 0.01). In contrast, no significant changes were observed in ORA magnitude (P = 0.81) and anterior corneal astigmatism (P = 0.12). The mean overall efficacy and safety indices were 0.96 and 1.01, respectively. These indices were not correlated with preoperative ORA (r = −0.15, P = 0.15). Furthermore, a significant correlation was found between ORA (r = 0.81, P < 0.01) and PCA postoperatively, but not preoperatively (r = 0.12, P = 0.25). Likewise, a significant correlation of ORA with manifest refraction was only found postoperatively (r = −0.38, P < 0.01). Conclusions: The magnitude of ORA does not seem to be a predictive factor of efficacy and safety of myopic LASIK using a solid-state laser platform. The higher relevance of PCA after surgery in some cases may explain the presence of unexpected astigmatic residual refractive errors.

A compact difference scheme for numerical solutions of second order dual-phase-lagging models of microscale heat transfer

Dual-phase-lagging (DPL) models constitute a family of non-Fourier models of heat conduction that allow for the presence of time lags in the heat flux and the temperature gradient. These lags may need to be considered when modeling microscale heat transfer, and thus DPL models have found application in the last years in a wide range of theoretical and technical heat transfer problems. Consequently, analytical solutions and methods for computing numerical approximations have been proposed for particular DPL models in different settings. In this work, a compact difference scheme for second order DPL models is developed, providing higher order precision than a previously proposed method. The scheme is shown to be unconditionally stable and convergent, and its accuracy is illustrated with numerical examples.

Minutes explaining difference between first act. rendered Judge and charges to that date entered on Estate Book, 1820 February

Two pages with calculations and notes relating to the differences between the Estate Book and the account rendered by the Judge of Probate.

Difference and Hierarchy Revisited by Feminism

Drawing heavily on the work of classicist Page duBois, which eloquently explains the emergence, in ancient Greece, of hierarchy and of what is still understood today as the great chain of being (scala naturae: male, female, slave, barbarian, animal), this paper analyzes the age-old negative conotations of the concept of difference in western culture, considers the reinvention of difference as “positive” by Rosi Braidotti (after Deleuze & Guattari), and reassesses the efforts of several other feminist philosophers (e.g. Luce Irigaray, Judith Butler, Gayatry Spivak, Drucilla Cornell) to counter Lacan on the impossibility of “speaking women” beyond the dominant (male) philosophical discourse. Or, to paraphrase Marie Cardinal, their efforts to find “les mots pour le dire”.

Les effets du dalcetrapib, un inhibiteur de la protéine de transfert des esters de cholestérol (CETP), sur la structure et la fonction des lipoprotéines de haute densité (HDL) dans l’étude dal-PLAQUE2

Introduction : Le dalcetrapib, inhibiteur de la glycoprotéine hydrophobe de transfert des esters de cholestérol (CETP), a été étudié dans le cadre de l’essai clinique de phase II dal-PLAQUE2 (DP2). L’objectif principal est d’étudier l’effet du dalcetrapib après 1 an de traitement sur la structure et la fonction des HDL dans une sous-population de la cohorte DP2. Méthode : Les sujets de la cohorte DP2 ayant une série de mesures de cIMT et des échantillons de plasma et sérum au baseline et à 1 an de traitement furent sélectionnés (379 sujets: 193 du groupe placebo (PCB) et 186 du groupe dalcetrapib (DAL)). Des données biochimiques prédéterminées, le profil des concentrations et tailles des sous-classes de HDL et LDL en résonance magnétique nucléaire (RMN) et 2 mesures de capacité d’efflux de cholestérol (CEC) du sérum ont été explorées. Les données statistiques furent obtenues en comparant les changements à un an à partir du « baseline » avec un ANOVA ou ANCOVA. La procédure normalisée de fonctionnement d’essai d’efflux de cholestérol permet de calculer l’efflux fractionnel (en %) de 3H-cholestérol des lignées cellulaires BHK-ABCA1 (fibroblastes) et J774 (macrophages, voie ABCA1) et HepG2 (hépatocytes, voie SR-BI), vers les échantillons sériques de la cohorte DP2. Résultats : Pour la biochimie plasmatique, un effet combiné des changements d’activité de CETP dans les 2 groupes a causé une réduction de 30% dans le groupe DAL. Après 1 an de traitement dans le groupe DAL, la valeur de HDL-C a augmenté de 35,5% (p < 0,001) et l’apoA-I a augmenté de 14,0% (p < 0,001). Au profil RMN, dans le groupe DAL après 1 an de traitement, il y a augmentation de la taille des HDL-P (5,2%; p < 0,001), des grosses particules HDL (68,7%; p < 0,001) et des grosses particules LDL (37,5%; p < 0,01). Les petites particules HDL sont diminuées (-9,1%; p < 0,001). Il n’y a aucune différence significative de mesure de cIMT entre les deux groupes après 1 an de traitement. Pour la CEC, il y a augmentation significative par la voie du SR-BI et une augmentation via la voie ABCA1 dans le groupe DAL après 1 an de traitement. Conclusion : Après un an de traitement au dalcetrapib, on note une hausse de HDL-C, des résultats plutôt neutres au niveau du profil lipidique par RMN et une CEC augmentée mais trop faible pour affecter la valeur de cIMT chez les échantillons testés.

Do Institutional Changes Make a Difference? A veto player analysis of how institutional changes in the Council of the EU influence legislative efficiency and outputs. Brugges Political Research Paper No. 31, October 2013

A driving argument behind recent EU treaty reforms was that more qualified majority voting (QMV) was required to reduce the potential dangers of legislative paralysis caused by enlargement. Whilst existing literature on enlargement mostly focuses on the question of what changed in the legislative process after the 2004 enlargement, the question of why these changes occurred has been given far less attention. Through the use of a single veto player theoretical model, this paper seeks to test and explain whether enlargement reduces the efficiency of the legislative process and alters the type of legislation produced, and whether QMV can compensate for these effects. In doing this, it offers a theoretical explanation as to why institutional changes that alter the level of cohesion between actors in the Council have an influence over both the legislative process and its outcomes.

The US-China Joint Announcement on Climate Change: Can the G2 make a difference? CEPS Commentary, 26 November 2014

This Commentary finds that the US-China joint declaration on climate change, issued following the Asia-Pacific Economic Cooperation (APEC) Summit in Beijing on November 12th, is undoubtedly an important announcement by the two global economic giants responsible for emitting over 30% of the world’s GHG emissions. As such, it needs to be seen as important and relevant – a very positive development towards a new global climate change agreement in Paris. It is a challenge to those that have announced their pledges and are seen as capable of doing more, as well as to those that have not yet announced their intentions. It shows the importance and success of the UN climate change conference in Warsaw last year, when the decision was made that all Parties should announce their commitments by the first quarter of 2015. It also represents a total breakdown of the Kyoto Protocol-style separation in climate change negotiations between countries into Annex 1 and non-Annex 1, with China signalling that it is taking on the leadership role that comes with being a great economic power. In broader terms, it shows that there is scope for cooperation between the two main economic actors, even in the face of competition in other spheres. It is also a challenge to the EU, which was a leader and needs to show that there is a benefit in maintaining its leadership. Finally, agreements are deemed historic only by history. This one is important, and a potential game-changer, on the face of it. But it needs to live up to its promise. There is sufficient uncertainty for us to withhold final judgement and see if its promise materialises through implementation. But, as sober a judgement as we must make on such important matters, this announcement certainly gives us great hope that it is possible to do what needs to be done, and we must wholeheartedly welcome and applaud it.

The EU-Central Asia Human Rights Dialogues: Making a Difference? EUCAM Policy Brief No. 16, April 2011

Structured human rights dialogues are held with each of the five Central Asian republics. They are designed to discuss questions of mutual interest and enhance cooperation on human rights as well as to raise the concerns of the EU on human rights in Central Asia. In addition, the dialogues seek to involve human rights activists, NGO members, and academia representatives from both Europe and Central Asia through civil society seminars. But is this working? Is improvement in human rights noticeable in the region? This policy brief reviews and evaluates the performance of the dialogues to date, paying specific attention to the shortcomings of the existing practices, and provides recommendations for what could be improved with regard to planning and procedures.

The EU’s Enlargement Strategy 2015: Will the ‘new elements’ make a difference? CEPS Commentary, 26 November 2015

After an unprecedented delay, the European Commission adopted its 2015 Enlargement Package on November 10th, together with the annual reports on each of the candidate and prospective candidate countries. In this Commentary, Erwan Fouéré offers his assessment of what Enlargement Commissioner Johannes Hahn called the “new elements” in the package, including an “overarching strategy for the next 4 years” (coinciding with the remainder of the Commission’s mandate), “much clearer guidance to the countries on what they have to focus on in the year ahead”, as well as on the “longer-term results that are needed to meet EU expectations”.