Producing garment based multichromic smart sensors through dyeing cotton fabrics with chromic dyes

The importance of technical, functional and smart textiles with high added value is gradually increasing. One class of smart textiles is chromic materials. Chromism is a reversible change in color caused by certain factors (temperature, pH, etc.). In this study, it is aimed to develop a process that will ensure the dyeability of cotton fabrics with halo-, thermo- and photochromic dyes by using padding method. After determining the optimum conditions for each chromic dyes, their binary and triple combinations were also performed. A cabinet design in which the color change of chromic fabrics can be observed with the effect of pH (acid and base vapors), temperature and/or light is also realized. In this cabinet, the color change of the fabrics is detected by camera depending on pH, temperature and time. It is determined that the chromic fabrics produced in this study can react well to changes in pH, temperature and light, and maintain color changing ability as long as 20 cycles. Using the triple combination of thermochromic, halochromic and photochromic dyes, a method for producing cotton smart sensor clothes (or a wristband etc.) that can provide one or both of the following functions; informing whether the ambient temperature is uncomfortable or risky for the worker (thermochromic), notifying if there is a dangerous chemical vapor (acid–base vapors) in the work environment (halochromic), and creating a visual effect (photochromic) by changing color with UV rays on one hand, while providing protection against UV rays on the other hand, was developed. Graphic abstract: [Figure not available: see fulltext.] © 2021, The Author(s), under exclusive licence to Springer Nature B.V.5190051This study was funded by TUBITAK within 5190051 coded 1505 project

Evaluation of the surface detail reproduction of impression materials used for ocular prostheses [Oküler protezlerde kullanilan ölçü maddelerinin yüzey netliklerinin değerlendirilmesi]

2-s2.0-85078269719Objective: To evaluate the surface detail reproduction of four types of impression materials compatible for the socket impression in the fabrication of ocular prosthesis. Material and Method: Three alginate impression materials (orthoprint(OP), Ca37(C), Ophthalmic Alginate (OA) and a polyvinyl siloxane material (Affinis (P)) have been tested. A total of 40 impressions were made of stainless steel metal dies (ADA specification 19). The dies had 2 vertical and 3 horizontal lines inscribed on their superior surfaces. The measurements have been conducted on the 20-50-75 µm horizontal lines on the surface of the impression. Surface detail reproduction was evaluated using a microscope at 80X magnification. Statistical analysis was performed (one-way ANOVA and Bonferroni, alpha=0.05). Results: Polyvinyl siloxane material resulted in the highest values and showed the most accurate surface at all of the 20-50-75 µm lines; whereas, lowest values were observed with Orthoprint. Conclusion: Polyvinyl siloxane impression material showed the highest surface detail necessary for the construction of an ocular prosthesis among other impression materials tested. © 2019, Nobelmedicus. All rights reserved

Effect of STEM Designed Activities on Academic Achievement of 7th Grade Elementary School Students in Force and Energy Unit

The purpose of this study was to examine the effect of STEM designed activities on academic achievement of 7th grade elementary school students in work and energy unit. For that purpose, four STEM activities were chosen to be implemented in the work and energy unit. Semi-experimental research design was utilized for the research. Two different classrooms were chosen randomly as control and STEM group. 19 students were in the control group and 21 students in the STEM group. Both classrooms were instructed by the same teacher with the same instruction time. The only difference between the groups was the STEM integrated activities. Initial analyzes revealed that there was no statistically significant difference between the groups in terms of academic knowledge level prior the study. After implementing the STEM activities for the STEM group, statistical analyzes revealed that there was a statistical positive difference in favor of the STEM group. After a month, posttest was administered to STEM group in order to determine the retention level of the students. Analyzes revealed that there was no statistically significant difference between control group and STEM group.Analyzes revealed that there was no statistically significant difference between boys and girls in STEM group. It was concluded by the study that in the long-term STEM integrated curricula would benefit elementary science students and would decrease the gender gap in STEM related areas. © 2022 Journal of Open Humanities Data. All rights reserved

Peer-to-peer multipoint video conferencing with layered video

Due to copyright restrictions, the access to the full text of this article is only available via subscription.A peer-to-peer (P2P) architecture for multipoint video conferencing using layered video coding at the end hosts is proposed. The system primarily targets end points with low bandwidth network connections and enables them to create a multipoint video conference without any additional networking and computing resources beyond what is needed for a point-to-point conference. For P2P multipoint video conferencing applications, wide-area collaboration is significant for connecting participants from different parts around the globe to support collaborative work. In our system, peers collaborate for streaming video, and the motivation behind the use of layered video is to overcome the problem of denying video requests by peers and assure that each participant peer can view any other participant at any configuration. Layered video encoding techniques usable within this architecture are discussed. A protocol for operating the system has been developed, simulated and its performance has been analyzed. Furthermore, a multi-objective optimization approach has been developed to simultaneously minimize the number of base layer receivers and the delay experienced by the peers while maximizing the granted additional requests to support peers having multiple video input bandwidths. The use of the multi-objective optimization scheme is demonstrated through an example scenario and simulations. A prototype has also been implemented, and the system has been formally specified and verified.TÜBİTA

TAC proton accelerator facility: Normal conducting part

Copyright © 2014 CC-BY-3.0 and by the respective authors.The Turkish Accelerator Center Proton Accelerator Facility (TAC PAF) is based on a 1 MW and 2-GeV proton linac that will include both normal conducting and superconducting accelerator structures. The normal conducting part of the TAC PAF will consist of an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line, and two drift tube linac structures in order to accelerate the beam up to 65 MeV. Acceleration from 65 MeV up to 2-GeV energy will be provided by a SC-spoke cavity and two SC-elliptical cavities. In the long term, TAC PAF will be used as a neutron source. We report the current status of the project including accelerator structures, ion source studies, and possible experimental stations