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    Effect of wheat straw ash as cementitious material on the mechanical characteristics and embodied carbon of concrete reinforced with coir fiber
    (Elsevier Ltd, 2024) Bheel, Naraindas; Kumar, Sandeep; Kirgiz, Mehmet Serkan; Ali, Mohsin; Almujibah, Hamad R.; Ahmad, Mahmood; Gonzalez-Lezcano, Roberto Alonso
    The use of supplementary cementitious materials has been widely accepted due to increasing global carbon emissions resulting from demand and the consequent production of Portland cement. Moreover, researchers are also working on complementing the strength deficiencies of concrete; fiber reinforcement is one of those techniques. This study aims to assess the influence of recycling wheat straw ash (WSA) as cement replacement material and coir/coconut fibers (CF) as reinforcement ingredients together on the mechanical properties, permeability and embodied carbon of concrete. A total of 255 concrete samples were prepared with 1:1.5:3 mix proportions at 0.52 water-cement ratio and these all-concrete specimens were cured for 28 days. It was revealed that the addition of 10 % WSA and 2 % CF in concrete were recorded the compressive, splitting tensile and flexural strengths by 33 MPa, 3.55 MPa and 5.16 MPa which is greater than control mix concrete at 28 days respectively. Moreover, it was also observed that the permeability of concrete incorporating 4 % of coir fiber and 20 % of WSA was reduced by 63.40 % than that of the control mix after 28 days which can prevent the propagation of major and minor cracks. In addition, the embodied carbon of concrete is getting reduced when the replacement level of cement with WSA along with CF increases in concrete. Furthermore, based on the results obtained, the optimum amount of WSA was suggested to be 10 % and that of coir fiber reinforcement was suggested to be 2 % for improved results. © 2024 The Authors
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    Multiplexed Piezoelectric Electronic Skin with Haptic Feedback for Upper Limb Prosthesis
    (WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA, 2024) Awais, Muhammad; AliAbbasi, Easa; Atik, Abdulkadir Yasin; Bathaei, Mohammad Javad; Ali, Mohsin; Das, Ritu; Dağ, Çağdaş; Ullah, Azmat; Singh, Rahul; Türker, Kemal Sıtkı; Başdoğan, Çağatay; Beker, Levent
    Upper limb amputation severely impairs tactile perception, limiting daily activities. Developing a near-natural replacement with prosthetic devices requires improving user sensory experiences during object interactions. The ideal upper limb prosthesis should provide real-time sensory feedback, mirroring natural experiences. Current prostheses struggle with providing adequate tactile feedback due to sensory limitations. Inspired by the sensory properties of skin, we present a micro-fabricated, multiplexed electronic skin (e-skin) with actuators for sensory feedback in upper limb amputation. The piezoelectric-capacitive sensor array detects static pressure, temperature, vibration, and texture, with integrated actuators stimulating the skin to provide real-time feedback. The sensors integrate with actuators via readout electronics, making the system standalone and easy to use. The flexible, compact sensor array design (two pixels within a 1 cm2 footprint) detects a wide range of pressure (0.5–10 kPa), temperature (22–60 °C), vibration (35–100 Hz), and texture (2.5–45 Hz), suitable for daily use. The e-skin, attached to a prosthetic finger, is tested for feasibility on human volunteers with wrist-mounted actuators. Statistics are used to quantitatively assess system performance. The integration of multiplexed sensors and actuators enhances tactile feedback, improving the quality of life for people with upper limb amputations.