Search results for "Sb"

On the Nature of the Plateau in Two-Step Dinuclear Spin-Crossover Complexes

2004

A remarkable feature of the spin-crossover process in several dinuclear iron(II) compounds is a plateau in the two-step transition curve. Up to now, it has not been possible to analyse the spin state of dinuclear pairs that constitute such a plateau, due to the relative high temperatures at which the transition takes place in complexes investigated so far. We solved this problem by experimentally studying a novel dinuclear spin-crossover compound [[Fe(phdia)(NCS)(2)](2)(phdia)] (phdia: 4,7-phenanthroline-5,6-diamine). We report here on the synthesis and characterisation of this system, which exhibits a two-step spin transition at T(c1)=108 K and T(c2)=80 K, displaying 2 K and 7 K wide therm…

Sara Stridsberg: Rakkauden Antarktis

2019

Kirja-arvostelu teoksesta Sara Stridsberg: Rakkauden Antarktis (Kärlekens Antarktis). Suom. Outi Menna. Tammi 2019. 303 s. nonPeerReviewed

Unveiling the role of the lone electron pair in sesquioxides at high pressure: compressibility of β-Sb2O3

2021

The structural, vibrational and electronic properties of the compressed beta-Sb2O3 polymorph, a.k.a. mineral valentinite, have been investigated in a joint experimental and theoretical study up to 23 GPa. The compressibility of the lattice parameters, unit-cell volume and polyhedral unit volume as well as the behaviour of its Raman- and IR-active modes under compression have been interpreted on the basis of ab initio theoretical simulations. Valentinite shows an unusual compressibility up to 15 GPa with four different pressure ranges, whose critical pressures are 2, 4, and 10 GPa. The pressure dependence of the main structural units, the lack of soft phonons, and the electronic density char…

The effect of energy-dependent detector efficiency in electron spectroscopic methods: XPS, AES and DCEMS

1993

Systematic studies were performed to investigate the distorting effect of the electron energy dependence of the channeltron detector efficiency on the shape of data distributions in electron spectroscopy. In agreement with earlier results for electron energies up to 3 keV, it was found that a virtually energy-independent shape of the electron distribution might be achieved even in a very broad range of electgron energies (up to 15 keV) by appropriate selection of the operational high voltage of a channeltron. However, the efficieny of channeltrons was also found to depend on count rates, indicating one of the principal difficulties in comparing distribution recorded under different experime…

Short range ordering and phase separation in rapidly quenched Ni80 57Fe1P19 amorphous alloys solution treated at different temperatures

1990

Abstract  Electrochemical measurements and Mossbauer spectroscopy were used to study a rapidly quenched Ni80 57Fe1P19 amorphous alloy solution treated between 920 and 1500 °C. Different short range orderings were shown in amorphous alloys solution treated at different temperatures. This finding can be associated with phase separation occurring in the liquid state. This phase separation can be inherited in slightly relaxed amorphous state.

Optimisation of liquid rubber modified bitumen for road pavements and roofing applications

2020

Abstract Polymer Modified Bitumens (PMBs) are largely used for pavement and roofing membranes applications with Styrene-Butadiene-Styrene Block copolymer (SBS) playing a major role in both markets despite its constantly increasing price due to the rising demand for quality bitumen modifiers. On the other hand, there is an increasing trend of recycling end of life tyres generating Recycled Tyre Rubber (RTR) at affordable price. This investigation aims at engineering a modified bitumen with a combination of Liquid Rubber (LR), a homogeneous blend of 50–70% RTR pre-processed in combination with heavy oils, and a wax denominated Ethylene Bis Stearamide (EBS). In the first phase, the effect of L…

Contrast sensitivity after refractive lens exchange with diffractive multifocal intraocular lens implantation in hyperopic eyes

2008

Contrast Test chart at distance and near under 3 luminance levels (85.0 cd/m 2 , 5.0 cd/m 2 , and 2.5 cd/m 2 ) before and after RLE with bilateral AcrySof ReSTOR IOL implantation in 30 hyperopic eyes with presbyopia and low astigmatism (%1.0 diopter). Results after surgery were compared with those before surgery. RESULTS: Six months postoperatively, the mean residual spherical equivalent refractive error was 0.21 diopter G 0.19 (SD). The best corrected distance and near visual acuities were comparable to those before surgery. For distance vision, the safety index was 1.02 and the efficacy index was 0.91. For near vision, the values were 1.04 and 1.02, respectively. There were no statistical…

[Breu, 1728, 01, 23]

1728

Inclou: 1. Reperitur in Actis Tribunalis Curiae Episcopalis Papiae [et] signantèr in Processu identitatis Corporis Sancti Augustini inter caetera ut sequitur videlicet. 1728. Die Veneris mensis Julii in tertiis ... Nos Don Franciscus Pertusati Ord. Sancti Benedicti ..., p. [1]-[3]. 2. Epistola R. P. M. Generalis ad totius sui Augustiniani Ordinis Provinciarum Provinciales ... Papiae die 3. Augusti 1728. F. Fulgentius Belleli Generalis, p. [4 Caplletra ornada Sign.: [ ]2 Reclams

Breve relacion de la invencion del sagrado cuerpo de ... San Agustin, y declaracion de su Identidad, hecha por el ... Obispo de Pavìa, segun lo dispo…

Corren exemplars d'aquest mateix text, també sense port. ni cologó i de 20 p., amb variants en la disposició del text i en les signatures tipogràfiques Caplletra ornada Sign.: A10 Notes marginals Reclams

RepeatsDB in 2021: improved data and extended classification for protein tandem repeat structures

2020

The RepeatsDB database (URL: https://repeatsdb.org/) provides annotations and classification for protein tandem repeat structures from the Protein Data Bank (PDB). Protein tandem repeats are ubiquitous in all branches of the tree of life. The accumulation of solved repeat structures provides new possibilities for classification and detection, but also increasing the need for annotation. Here we present RepeatsDB 3.0, which addresses these challenges and presents an extended classification scheme. The major conceptual change compared to the previous version is the hierarchical classification combining top levels based solely on structural similarity (Class > Topology > Fold) with two new lev…