Construction of Home-Made Tin Fixed-Point Cell at TUBITAK UME

Kalemci, M. | Arifovic, N. | Bağçe, A. | Aytekin, S.O. | Ince, A.T.

Article | 2015 | International Journal of Thermophysics36 ( 8 ) , pp.1968 - 1979

TUBITAK UME Temperature Laboratory initiated a new study which focuses on the construction of a tin freezing-point cell as a primary temperature standard. The design is an open-cell type similar to the National Institute of Standards and Technology design. With this aim, a brand new vacuum and filling line employing an oil diffusion pump and two cold traps (liquid nitrogen and dry ice) was set-up. The graphite parts (crucible, thermometer well, etc.) have been baked at high temperature under vacuum. Each cell was filled with approximately 1 kg of high-purity tin (99.9999 %) in a three-zone furnace. Then several melting and freezing . . .curves were obtained to assess the quality of the home-made cell, and also the new cell was compared with the existing reference cell of the laboratory. The results obtained are very close to the reference cell of UME, indicating that the method used for fabrication was promising and satisfactory and also seems to meet the requirements to have a primary level temperature standard. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Evaluation of Sexual Dysfunction in Males with Diabetes

Yıldız, H. | Bölüktaş, R.P.

Article | 2015 | Sexuality and Disability33 ( 2 ) , pp.187 - 205

This study was conducted in order to determine the prevalence of sexual dysfunction and factors affecting sexual dysfunction (SD) in male patients with diabetes. Diabetes is a public health problem. Erectile dysfunction (ED) is seen in nearly half of all males who have had diabetes for more than 10 years. Erectile dysfunction, metabolic and psychological factors are involved in the emergence. A descriptive was conducted and questionnaire was used in this study. Data was gathered via general knowledge form which consists of socio-demographic characteristics and risk factors, International Index of Erectile Function, Quality of Life S . . .cale (SF-36), Beck Depression Inventory, Coopersmith Self-Esteem Scale, and Body Image Scale. SD was determined in 48 % of our cases. The most affected domain among the cases was erectile function (33.1 %) and intercourse satisfaction (29.1 %), and the least affected domain was sexual desire (6.3 %). Most of the male cases with ED had mild and moderate ED (42.6 %). Factors affecting SD’s included age, education level, obesity, hypertension, retinopathy, vasculopathy, nephropathy, diabetic foot, HBA1C and LDL levels, diabetes duration, drugs used. All quality of life subgroups scores were lower in male patients with SD than patients without SD except for pain. Depression and body image scores were lower in male patients with SD. SD’s are affected by both metabolic and psychosocial factors. Sexual dysfunction in men with diabetes should be routinely evaluated. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Basic properties of the non-abelian global reciprocity map

İkeda, K.İ.

Conference Object | 2015 | Springer Proceedings in Mathematics and Statistics98 , pp.45 - 92

6th World Conference on 21st Century Mathematics, WC 2013 -- 6 March 2013 through 9 March 2013 -- -- 122289

Ultrasonic Investigation of the Effect of Carbon Content in Carbon Steels on Bulk Residual Stress

Uzun, F. | Bilge, A.N.

Article | 2015 | Journal of Nondestructive Evaluation34 ( 2 ) , pp.45 - 92

Formation of residual stress as a result of welding process is a familiar fact, but its relation with material composition is unknown. This study aims to investigate the effect of carbon content on welding residual stress in carbon steels. For this purpose, samples of ultra-low carbon interstitial free, low carbon and medium carbon steels are selected. Welding is performed as a beam on plate in spite of a joining process. Weld grooves are prepared at center of the rectangular samples. Automated submerged arc technique is preferred for welding process in order to ensure same welding parameters at each sample. Ultrasonic sound waves a . . .re used to determine residual stress. This non-destructive technique provides bulk residual stress which is average of shear and normal stresses through thickness of a material. A new approach is practiced to verify experimentally determined bulk residual stress with finite element simulation results. The model geometry of numerical analysis is divided into equivalent parts and average of shear and normal stresses is calculated. Non-destructive ultrasonic technique seems to be in good agreement with finite element analysis. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Fabrication and Characterization of Nanoporous Silicon Relative Humidity Sensors

Aytekin, S.O. | Ince, R.

Article | 2015 | International Journal of Thermophysics36 ( 12 ) , pp.3421 - 3439

This work describes a porous, silicon-based humidity sensor operating under the capacitive transduction principle. One of the aims of this work is to determine the main parameters such as sensitivity, linearity, hysteresis, and time response to step humidity changes of four samples via measurements of their capacitance. The parameters gauged by capacitance measurements were used to explain the dynamics of its operation. The most sensitive sample caused changes in relative humidity of 74nF·%rh-1. Hysteresis of at least 3.6 % to 4.6 % was found to occur. Humidity sensor samples synthesized from nanoporous silicon were also analyzed by . . . scanning electron microscopy, image processing, and Raman spectra red shifts. As a result of these measurement and analysis of this work, the best synthesis conditions and nanopore surface and sub-surface diameters for producing high performing humidity sensors were identified. Another aim of this work is to find the optimal pore size from the analysis of image processing and Raman spectra. The optimal porous sizes in relation to the analyzed sensor’s characteristics were found to be between 4 nm and 26 nm. The novelty of this work is to establish the relationship between the capacitance measurements with image processing of SEM images and Raman spectral measurements. The mechanical stability of the samples was also gauged over 3 months utilizing both capacitance and Raman spectral measurements. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Enterobacter Strains Might Promote Colon Cancer

Yurdakul, D. | Yazgan-Karataş, A. | Şahin, Fikrettin

Article | 2015 | Current Microbiology71 ( 3 ) , pp.403 - 411

Many studies have been performed to determine the interaction between bacterial species and cancer. However, there has been no attempts to demonstrate a possible relationship between Enterobacter spp. and colon cancer so far. Therefore, in the present study, it is aimed to investigate the effects of Enterobacter strains on colon cancer. Bacterial proteins were isolated from 11 Enterobacter spp., one Morganella morganii, and one Escherichia coli strains, and applied onto NCM460 (Incell) and CRL1790 (ATCC) cell lines. Cell viability and proliferation were determined in MTS assay. Flow Cytometry was used to detect CD24 level and apopto . . .sis. Real-Time PCR studies were performed to determine NFKB and Bcl2 expression. Graphpad Software was used for statistical analysis. The results showed that proteins, isolated from the Enterobacter spp., have significantly increased cell viability and proliferation, while decreasing the apoptosis of the cell lines tested. The data in the present study indicated that Enterobacter strains might promote colon cancer. Moreover, Enterobacter spp. could be a clinically important factor for colon cancer initiation and progression. Studies can be extended on animal models in order to develop new strategies for treatment. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Speeding Up Logic Locking via Fault Emulation and Dynamic Multiple Fault Injection

Gören, S. | Gürsoy, C.C. | Yildiz, A.

Article | 2015 | Journal of Electronic Testing: Theory and Applications (JETTA)31 ( 05.06.2020 ) , pp.525 - 536

Today’s Integrated Circuit (IC) industry is suffering from piracy, overbuild ICs, and hardware Trojans. One way to protect ICs is logic locking. Logic locking is done by inserting extra logic to the original design’s netlist such that correct outputs are produced only when the correct key is applied. However, the determination of locations to insert logic is a computationally expensive process. In this paper, we propose a fault emulation technique to speed up the process of determination of fault locations. Our fault emulation technique enables dynamic multiple fault injection as well as real-time fault impact computation in a singl . . .e FPGA configuration. The effectiveness of the proposed emulation technique is evaluated with ISCAS’89 sequential benchmark circuits and results are presented. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

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