The role of Si impurities in the transient dopant segregation and precipitation in yttrium-doped alumina

Y-doped alumina was sintered at 1500 degrees C for 10 h under ultra-clean experimental conditions without experiencing any abnormal grain growth. The yttrium was fairly homogeneously distributed at the grain boundaries, with a mean value of (Gamma) over bar (Y) = 5.5 at nm(-2). The Y-Al-O precipitates in the clean, Y2O3-doped alumina specimen were the YAP (YAlO3) phase, whereas only the YAG (Y3Al5O12) phase was present in the Y2O3-doped alumina samples contaminated with SiO2. The excess concentrations of Y and Si atoms at the grain boundaries that, at the same time, provoke the formation of structurally complex YAG precipitates and abnormal grain growth were both estimated to be at 4-5 at nm(-2). The compositions of the triple point pocket phases found in the region of the exaggeratedly grown alumina grains indicate the presence of alumino-silicate bulk liquids at the sintering temperature

A natural limit on the observable periods of anomalous x-ray pulsars and soft gamma-ray repeaters

We investigate the dependence of the evolution of neutron stars with fallback disks on the strength of the magnetic dipole field of the star. Using the same model as employed by Ertan et al. (2009), we obtain model curves for different dipole fields showing that the neutron stars with magnetic dipole fields greater than ∼ 1013 G on the surface of the star are not likely to become anomalous X‐ray pulsars (AXPs) and soft gamma‐ray repeaters (SGRs). Other sources with conventional dipole fields evolve into the AXP phase if their disk can penetrate the light cylinder. The upper limits to the observed periods of AXP and SGRs could be understood if the disk becomes inactive below a low temperature around 100 K. We summarize our present and earlier results indicated by the evolutionary model curves of these sources with an emphasis on the importance of the minimum disk temperature and the X‐ray irradiation in the long‐term evolution of AXPs and SGRs with fallback disks

Investigation of Erosion Corrosion Caused by Drinking Water in the Faucet with Computational Fluid Dynamics

In this study, the reason for erosion-corrosion of drinking or mains water in the faucet was investigated by computational fluid dynamics. Pipes used in homes, the service sector, and industry are responsible for transporting different types of fluids from one place to another. Considering the faucet design, the SolidWorks program was used for 3D studies. In-faucet flow analyses were performed using Ansys Fluent, a computational fluid dynamics program based on the finite volume method. In the analyses, lime particles were chosen. At the end of the analysis, the amount of erosion in the faucet was obtained

Metal kaplı nano fiberler

Mevcut buluş, nano-­fiberlerin metal kaplanması için bir yönteme, bu yöntemle elde edilen metal kaplı nano-­fiberlere ve bu metal kaplı nano-­fiberlerin kullanımına ilişkindir.Sabancı Üniversites

The Effects of Age at Circumcision on Premature Ejaculation 2

SUMMARY Objective: The objective of this study was to analyze the effect of age at circumcision on premature ejaculation (PE). Materials and Methods: The study included 40 healthy male controls and 40 male patients diagnosed as PE according to American Psychiatric Association criteria and the Golombok-Rust Inventory of Sexual Satisfaction (GRISS) premature ejaculation subscale. The 2 groups were compared according to age at circumcision and GRISS score. Results: The PE group and control group were sociodemographically similar, but differed in marital status. The groups differed in GRISS communication, degree of satisfaction, avoidance, sensuality, erectile dysfunction, and PE subscale scores. These differences only displayed a dysfunction in the degree of satisfaction and premature ejaculation subscales. The groups also differed in age at circumcision; accordingly, those that were circumcised at ≥7 years of age had higher GRISS scores and a higher risk of having PE than those that were circumcised at >7 years of age. Conclusion: Age at circumcision had an effect on PE; circumcision at ≥7 years of age was associated with an increase in the risk of PE, as compared to circumcision at >7 years of age. We think that families should have their boys circumcised before the age of 7 years and highly recommend that the procedure be performed within in the first 3 years of life

Species-Specific Effects of Passive Warming in an Antarctic Moss System

Polar systems are experiencing rapid climate change and the high sensitivity of these Arctic and Antarctic ecosystems make them especially vulnerable to accelerated ecological transformation. In Antarctica, warming results in a mosaic of ice-free terrestrial habitats dominated by a diverse assemblage of cryptogamic plants (i.e. mosses and lichens). Although these plants provide key habitat for a wide array of microorganisms and invertebrates, we have little understanding of the interaction between trophic levels in this terrestrial ecosystem and whether there are functional effects of plant species on higher trophic levels that may alter with warming. Here, we used open top chambers on Fildes Peninsula, King George Island, Antarctica, to examine the effects of passive warming and moss species on the abiotic environment and ultimately on higher trophic levels. For the dominant mosses, Polytrichastrum alpinum and Sanionia georgicouncinata, we found species-specific effects on the abiotic environment, including moss canopy temperature and soil moisture. In addition, we found distinct shifts in sexual expression in P. alpinum plants under warming compared to mosses without warming, and invertebrate communities in this moss species were strongly correlated with plant reproduction. Mosses under warming had substantially larger total invertebrate communities, and some invertebrate taxa were influenced differentially by moss species. However, warmed moss plants showed lower fungal biomass than control moss plants, and fungal biomass differed between moss species. Our results indicate that continued warming may impact the reproductive output of Antarctic moss species, potentially altering terrestrial ecosystems dynamics from the bottom up. Understanding these effects requires clarifying the foundational, mechanistic role that individual plant species play in mediating complex interactions in Antarctica\u27s terrestrial food webs

OTURMA MOBİLYASI TASARIMINDA BİLGİSAYAR DESTEKLİ ERGONOMİK ANALİZ

Çalışmada, insanların birebir ilişkide olduğu oturma mobilyalarının tasarımında, ergonomik kriterlerin belirlenmesi amacıyla bir “insan odaklı ürün geliştirme” yazılımının (Anybody Technology) kullanılabilirliği araştırılmıştır. Yapılan örnek uygulamada, oturma derinliği, oturma yüksekliği ve arkalık eğim açısı farklı olan 2 adet sandalyede oturan insanın kas–iskelet sisteminde oluşan yükler niceliksel olarak analiz edilmiştir. Ayrıca, 10 erkek deneğin katılımıyla uygulanan bir anket yardımı ile de bu iki farklı sandalyede oturan bireylerin çeşitli vücut bölgelerinde hissettikleri duygular niteliksel olarak belirlenmiştir. Çalışma sonucunda, ürün geliştirme yazılımından alınan veriler, anketlerden alınan veriler ile tutarlı olup, insan odaklı ürün geliştirme yazılımının tasarlanacak mobilyaların ergonomik kriterlerinin belirlenmesinde kullanılabilir olduğunu doğrulamaktadır

N-(2-Hydroxyphenyl)-4-methylbenzenesulfonamide

In the title compound, C13H13NO3S, the dihedral angle between the benzene rings is 64.15 (7)° and the C-S-N-C torsion angle is -57.18 (12)°. An intra­molecular N-H...O hydrogen bond closes an S(5) ring. In the crystal, O-H...O hydrogen bonds link the mol­ecules into C(8) chains propagating in [100]. Weak C-H...[pi] inter­actions are also observed