Chenni, Abdenour Bezzi, Tarek Djidjelli, Hocine Boukerrou, Amar Kecha, Mouloud
Published in
Materials Testing
Chitin and chitosan as green and active biomacromolecules were extracted from local seafood waste (shrimp shells). The extraction was carried out by a soft chemical process, followed by structural characterization (FTIR, XRD, viscosity average molecular weight M̅v), thermal stability by TGA, and antibacterial tests. FTIR and XRD spectra confirmed t...
Santos, Mário Santos, Jaime Reis, Paulo Amaro, Ana
Published in
Materials Testing
In the present work, different ultrasonic C-scan approaches were used to evaluate Carbon Fiber Reinforced Polymers (CFRP) submitted to impacts of low energy, in order to evaluate their effectiveness for the detection and characterization of small defects. In particular, as to the question how useful could be the air-coupled C-scan approach, using l...
Lubin, Ira M. Lockhart, Edward R. Frank, Julie See, Vincent Y. Vashist, Sudhir Greene, Carol
Published in
Diagnosis
BackgroundAn increasing number of diagnostic evaluations incorporate genetic testing to facilitate accurate and timely diagnoses. The increasing number and complexity of genetic tests continue to pose challenges in deciding when to test, selecting the correct test(s), and using results to inform medical diagnoses, especially for medical professiona...
Paa-rai, Chuleeporn Lothongkum, Gobboon Wangyao, Panyawat
Published in
Materials Testing
IN-738 turbine blade samples, deteriorated after long term service at high temperatures, were solution heat-treated at two temperatures, 1398 K and 1473 K, for 7.2 ks. Subsequently, the samples were cooled down in different atmospheres, in air and in furnace, for the purpose of studying the effects of different cooling media (rates) on the restored...
Buttler, Torben Hamje, Jens Reiter, Rolf Wesling, Volker
Published in
Materials Testing
During polymer extrusion there are a variety of situations in which the screwthread of the extrusion screw has an unlubricated metal-to-metal contact with the barrel wall. At the same time the screw coating is subjected to the highest loads. The combination of a secondary hardening cold work steel 1.2379 and a chromium nitride coating deposited by ...
Gong, Lihua Guo, Weimin Pan, Feng
Published in
Materials Testing
The influence of metal inert-gas arc welding (MIG) on the corrosion behavior of 6061-T6 aluminum alloy in a simulated tropical marine atmospheric environment (related to high temperature, high humidity and high salt spray) were examined by dry-wet alternate immersion corrosion tests. The equivalent conversion was used to design the accelerated test...
Saibi, Hakim Hag, Diab Bakri Alamri, Mohammed Saeed Mohammed Ali, Hamdan Abdo
Published in
Open Geosciences
The crustal structure beneath the United Arab Emirates (UAE) is still relatively unknown. Here, we use regional gravity data to constrain the subsurface density distribution and structure of the crust of the UAE by applying diverse gravity derivatives methods such as horizontal derivative (HDR), analytic signal (AS), and tilt angle (TA) to analyze ...
Sujatmiko, Febrian Sahroni, Imam Fadillah, Ganjar Fatimah, Is
Published in
Open Chemistry
The composite of tin oxide-reduced graphene oxide (SnO2/rGO) was prepared via a green synthesis of rGO using Pometia pinnata leaf extract followed by the dispersion of the SnO2 precursor. The composite was employed as a photocatalyst for the removal of methylene blue (MB) under UV and visible light. A variety of spectroscopic and analytical techniq...
Alagarsamy, Sivasamy Ravichandran, Manickam
Published in
Materials Testing
The present study was carried out to analyze the effect of process parameters during EDM machining of AA7075-10 wt.-% TiO2 aluminum matrix composite (AMC). The composite was produced through stir casting. The EDM process parameters such as the electrode material (Cu, Br, EN-8), pulse current (5, 10 and 15 A), pulse ON time (300, 600 and 900 μs) and...
Clark, Bennett W. Lee, Yi Zhen Joan Niessen, Timothy Desai, Sanjay V. Garibaldi, Brian T.
Published in
Diagnosis
BackgroundFeedback based on direct observation of the physical examination (PE) is associated with enhanced educational outcomes, yet attending physicians do not frequently observe graduate trainees performing the PE.MethodsWe recruited volunteer patients (VPs), each with an abnormality of the cardiovascular, respiratory, or neurological system. In...
