Observation of heavy spin-orbit excitons propagating in a nonmagnetic background: The case of (Ba,Sr)2YIrO6

We present a combined experimental and theoretical study of the elementary magnetic excitations in Ba2YIrO6 and Sr2YIrO6 - the two most intensively discussed candidates for a new type of magnetic instability caused by exciton condensation. For both materials, high-resolution resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge reveals sharp excitations around 370 and 650 meV energy loss, which we identify as triplet and quintet spin-orbit excitons. While the momentum-dependent RIXS spectra reveal that both the triplet and the quintet propagate coherently within the nonmagnetic background of the singlet sites, these modes remain fully gapped. The Ir-Ir exchange interactions in both double perovskites are therefore not strong enough to overcome the magnetic gap and, hence, our results exclude an intrinsic magnetic instability due to a condensation of magnetic excitations for both Ba2YIrO6 and Sr2YIrO6

Leisure perceptions of adolescents [Ergenlerin boş zaman değerlendirme algisi]

Culture which individual belongs to do effect not only his life style but also his leisure perception, attitudes and behavior. This study focuses on 13 year old adolescent’s leisure perceptions, activities and their related feelings considering the gender differences. Data were gathered by survey instrument covering two parts including 3 open-ended questions which were asked to 371 children attending the seventh grade of three elementary schools of Ministry of Education in Izmir (Karşıyaka and Bornova). Descriptive analyze was used. Findings indicated that one-third of the adolescents described leisure “doing nothing and being idle”; half of the males spend time on internet, some females study for the tests; generally, few participated in sports and social activities. Considering the collectivist values dominating the Turkish society, initially starting with the parents, adolescents leisure awareness should be increased and guided by education. © 2012, Hacettepe University. All rights reserved

Microbial corrosion of galvanized steel by a freshwater strain of sulphate reducing bacteria (Desulfovibrio sp.)

Microbially influenced corrosion of galvanized steel was investigated exposing coupons (2.0 x 2.0 cm) to culture of sulphate reducing bacteria strain Desulfouibrio sp. The coupons were exposed to the SRB culture for 4, 8, 24, 72, 96, 168, 360 and 744 h along with a control set in uninoculated medium. The results from the present study suggest that SRB were responsible for the corrosion of the galvanized steel. The corrosion rate of galvanized steel was not be correlated with the number of sessile SRB cells. Also Desulfouibrio sp. had an ability to produce EPS (Extracellular Polimeric Substances) and biodegrade the carbohydrate, that is the predominant component of the EPS produced by them. When Desulfovibrio sp. cells were in logarithmic phase, the concentration of dissolved zinc in the bulk solution was very toxic for Desulfooibrio desulfuricans. (c) 2006 Elsevier Ltd. All rights reserved

A comparison of four different microleakage tests for assessment of leakage of root canal fillings

Objective. The purpose of this study was to compare four different microleakage tests (dye leakage, electrochemical test, bacterial test and fluid filtration) for evaluation of the coronal seal of teeth obturated using Thermafil or lateral condensation techniques

Investigation of anti-adhesivity property of 630 steel with laser textured surface

Cebelcor;CEZ Group;Leica Microsystems;npj Materials Degradation;SandvikJoint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017 -- 3 September 2017 through 7 September 2017 -- -- 136637The adhesion of Escherichia coli to the laser textured surface (LTS) of 630 stainless steel were investigated in this study. The contact angles of the surfaces were measured by sessile drop method. Both laser textured and control (untreated) coupons were exposed to the E. coli culture for 48 h in a lab-scaled test system. Attached bacterial counts and produced carbohydrate amounts in extracellular polymeric substances (EPS) on LTS and control surface (CS) were compared to investigate the surface adhesion property of hydrophobic surface. The bacteria were found to be attached to the LTS later than on the CS. Also, the counts of sessile E. coli on the LTS were lower than that on the CS. In addition, it was determined that the carbohydrate amounts on LTS were significantly higher than the ones on CS (p< 0.01). It could be an indication that bacteria secrete more EPS to adhere to the hydrophobic surface. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved