In this study, the effect of nano-TiN layer obtained by PVD method on tribological behaviour of X210Cr12 (1.2080, AISI D3) cold work tool steel was investigated. Coating process was carried out by cathodic-arc PVD method using 200 V voltage, 350 °C temperature, 4x10 -4 mbar pressure, and 50 A current application conditions. The characterization of the coating was carried out by FESEM and SEM-EDS analysis. The coated and uncoated samples were subjected to abrasive wear test against to 220 mesh sandpaper under 3 different loads (5, 10, and 20 N). The tests were applied at three different sliding distances (100 m, 200 m, and 600 m) keeping the sliding speed as constant at 2,6 m/s. For uncoated samples, while the applied load increased from 5 N to 20 N, the approximate wear loss increased by 10 and 8.5 times, respectively. The approximate wear loss increased by 2.2 and 12.2 times, respectively in nano-TiN coated samples. When compared to the coated and uncoated samples, the wear loss values obtained in the coated samples at sliding distances of 100 m and 200 m differed greatly from uncoated samples, under same conditions almost 100%. However, when the sliding distance reached 600 m, the gap started to close and the gap decreased to 30%. Under the same conditions, the wear rate of the coated samples decreased up to 15 times compared to uncoated samples.

Ti6Al4V alloy is the most widely used titanium alloy due to its attractive properties such as heat resistance, strength, plasticity, toughness, formability, weld-ability, corrosion resistance and biocompatibility. However, the main problem with titanium and its alloys is that they have poor tribological performance. Boriding seems to be the effective way to improve the tribological performance of titanium alloys. Titanium borides have an attractive combination of low density, high hardness, excellent wear, and corrosion resistance. In this study, Ti6Al4V alloy was borided in a solid media at 1100 • C for 20 h. The microhardness profile was studied by a Vickers indenter. The hardness value of surface increases from 330 HV to 2789 HV. Wear experiments were performed in Ringer's solution that simulates human body environment. It was observed that boriding process improved tribological performance of Ti6Al4V alloy under all test conditions.

Aralık 2019'da tespit edilen ve ilk olarak Çin'in Wuhan eyaletinde ortaya çıkan yeni koronavirüs (COVID-19) salgını özellikle 65 yaş üstü bireyleri etkiledi. Salgından korunma tedbirleri kapsamında bir çok ülke, yaşlı yetişkinlerin başkalarıyla temaslarını kesmek için sokağa çıkma yasakları uyguladı. Türkiye de bu ülkelerden biridir. Bu süreçte insanlar pek çok zorlukla karşılaştılar. Bu çalışmanın amacı, COVID-19 sürecinde 65 yaş üstü bireylere yönelik sokağa çıkma yasaklarından dolayı yaşanan sorunları tespit etmek ve çözüm üretmektir. Katılımcıların konuya ilişkin görüşlerini belirlemek için nitel araştırma yöntemi kullanılmıştır. Araştırma verilerini elde etmek için araştırmacılar tarafından geliştirilen yarı yapılandırılmış görüşme formu kullanılmıştır. Katılımcıların belirlenmesinde ana kriter 65 yaş üstü bireylerdir. Katılımcılar ölçüt örnekleme yöntemine uygun bir şekilde belirlenmiştir. Nitel verilere içerik analizi uygulanmıştır. Araştırma Denizli'de 13 katılımcının (5 = kadın; 8 = erkek) görüşleri ile yapılmıştır. Araştırmaya göre 65 yaşın üzerindeki kişiler, kendilerinin ve çocuklarının COVID-19 ile enfekte olacağından endişe duymuşlardır. Dışarıda vakit geçirmeyi ve birine sarılmayı özlemişlerdir. Sağlık ve temizlik ile ilgili tedbirler alma konusunda hassasiyet göstermişlerdir. Yan yana olmadan aileleriyle iletişim halinde olmaya özen göstermişlerdir. Sosyal güvencesi olmayanlar bu süreçte kendilerine maaş ödenmesi gerektiğini düşüncesi içerisindedir. COVID-19 salgını devam ettiği sürece yaşlı yetişkinlerin gereksinimlerinin önemsenmesi onların ekonomik ve psikolojik açıdan önemlidir.

Dementia and Alzheimer's disease are affecting more and more people worldwide. According to the World Health Organization, 60-70% of the approximately 55 million people diagnosed with dementia worldwide suffer from Alzheimer's, adding 9.9 million new cases diagnosed each year. While the annual global cost of dementia exceeds $1 billion, its cost is estimated to double by 2030. It is stated that new digital technologies and e-health solutions for dementia patients have a strong potential to help individuals face the challenges related to dementia and neurodegenerative disorders. Some examples of e-health solutions for people with dementia are reported as wearable, portable, or implantable devices, depending on appropriate platforms and services, and to support interaction between patients and doctors. New digital technologies are powerful tools to help individuals overcome the challenges of dementia and neurodegenerative disorders. Communication difficulties are common in people with dementia. Meaningful communication initiatives using technology and the Internet can help alleviate symptoms and perhaps lessen their severity. To develop and implement this potential, it is essential to produce solutions that combine health sciences, social sciences, and engineering solutions. With the idea of REMEM, developed with this in mind, with the support of the Turkish National Agency and the European Union, mobile applications aimed at improving memory that can be used not only by dementia and Alzheimer's patients but also by others were examined and a new mobile application called REMEM was developed.

Today, polymers have found a wide range of uses from kitchen utensils to artificial heart valves, thanks to their lightness, easy shaping, corrosion resistance, and cheapness. A large number of polymers are used in the packaging of food, textiles, and machinery, and they are an important part of solid waste disposed of in landfills. In addition, microplastics, which are small particles under 5 mm, pose a major problem in the pollution of rivers, lakes, seas, and oceans and increase our carbon footprint. Many strategies are being developed in parallel with the Green Deal to reduce both all the negative effects caused by polymers and our carbon footprint. According to the European Green Deal, reducing waste, compensating for carbon footprint emissions, and protecting resources and sustainability are key priorities for the EU now and in the future. Reusability and biodegradable polymer production are important parts of these strategies. The scientific works demonstrated the opportunity for renewable, biodegradable biopolymers to replace their synthetic counterparts in a variety of /application. Biopolymer is a type of polymer and a biodegradable chemical compound that is produced by living beings in the ecosphere. Biopolymers obtained from natural materials (e.g. alginate, zein, gelatin, agar, and chitin/chitosan) are highly abundant but underexploited renewable biomasses. Besides their natural biological and structural functions, the biopolymers can be tailored to new biomaterials with novel functionalities. The roles of biopolymers in obtaining environmentally friendly materials are very important for the future of the world. So, are we aware of plastic pollution and ways to reduce it? Is there enough awareness in academia, industry, and society for biopolymers that are so important for a sustainable environment? In this study, the answers to these questions are researched and discussed.