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Johnson Matthey Technology Review - Fast Track

Accepted manuscripts have been peer reviewed (where appropriate) and accepted for publication but have not yet been copyedited, house styled, proofread or typeset. The final published version may contain differences as a result of these procedures.

22 Fast Track articles

21 - 22 of 22 Fast Track articles

    • Bacterial Kinetics for Control Shape and Biogenic Synthesis of Nanoparticles: Review

      Authors: Fathan Bahfie, Erik Prasetyo, Fajar Nurjaman, Mulyono, Heri Satria, Slamet Sumardi, Dewi Syahidah, Bernadetta Rina Hastilestari, Harta Haryadi, Anton Sapto Handoko, Suharto Suharto, Lucky Darmawan, Fahny Ardian, Ulin Herlina and Diah Susanti
      https://doi.org/10.1595/205651325X17364227730793
      Available online: 09 January 2025
      Nanoparticles have many applications, such in health, agriculture, etc. One of these essential nanoparticles is silver (Ag), which can be applied for drug delivery like encapsulation cause silver (Ag) nanoparticles have excellent antibacterial activity towards both human strains. In addition, silver synthesis can be explored by electrochemical approaches on bacterium after exposure to silver (Ag). The synthesis of nanoparticles can be achieved by biogenic synthesis, for instance, Morganella psychro-tolerant, silver-resistant psychrophilic bacteria. Morganella psychro-tolerans is a good bacterium with the same character as the Morganella morganii synthesizing silver nanoparticles. The ability of Morganella morganii was expressed due to its specificity to maintain high deliberation of silver (Ag) through the cell synthesis of rounded silver (Ag) nanoparticles and its ability to grow at a lower temperature range (psychros: cold) in the temperature range of 0-30 oC. Anisotropy form of silver nanoparticles can be attained by controlling this bacteria growth kinetics. This synthesis system can be employed by a green biosynthetic approach to achieve shape control of nanoparticles, which is an environmentally friendly, large-scale, and economical process. This review discusses Morganella psychro-tolerant for controlling shape and biogenic synthesis from related aspects such as the synthesis mechanism, the influencing factors like shape and size, the application method, and its development.

    • PID-based Closed-Loop Voltage Mode Control for Addressing Non-Idealities in Ćuk Converters for Renewable Energy Application

      Authors: Praanshu Srijan Shandilya, Ashutosh Gupta and Dheeraj Joshi
      https://doi.org/10.1595/205651325X17335005701531
      Available online: 06 December 2024
      Abstract: The Ćuk converter is extensively utilized across various applications for its capability to handle a wide range of input voltages and efficiently perform both voltage step-up and step-down conversions. However, the presence of parasitic elements, such as inductor winding resistance, capacitor equivalent series resistance (ESR), and losses in switches and diodes, significantly impacts the converter's performance, stability, and efficiency. This paper addresses these challenges by analyzing the effects of non-idealities in Ćuk converters operated under closed-loop voltage mode control. A detailed mathematical model of a 12 V to 24 V Ćuk converter is developed to evaluate the influence of parasitic elements and their interactions within the control system. This model provides valuable insights into the complexities introduced by these non-idealities and serves as a foundation for designing more resilient control strategies. To ensure output voltage stability and improved dynamic performance, a PID controller is employed with parameters optimized using the Ziegler-Nichols tuning method. The proposed control strategy is validated through MATLAB simulations, showcasing its effectiveness in countering the adverse effects of parasitics. The results indicate a stable operation with a steady-state error of less than 1%, a peak overshoot of 6.31%, a rise time of 6.21 ms, and a settling time of 37.4 ms. This work contributes to enhancing closed-loop voltage mode control strategies for non-ideal Ćuk converters, offering practical solutions to improve their reliability and efficiency in real-world applications.
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