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A review of vibration-based MEMS hybrid energy harvesters
Mohammed Salim,Hakim S. Sultan Aljibori,Dhia Salim,M. Haris M. Khir,A. Sh. Kherbeet 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Energy harvesters based on Micro-electromechanical systems (MEMS) are well known nowadays due to their small features, abilityfor monolithic integration with the integrated circuit in a single platform, robust, and easily fabricated in bulk. The piezoelectric (PZT)and the electromagnetic (EM) generators are examples of such energy harvesters. To further increase their effectiveness in harvestingambient energy, researchers started to venture into hybrid energy harvesters. Few literature reviews may be found on MEMS harvestingdevices, but not on hybrid harvesters in specific. This paper intended to further elaborate on the hybrid energy harvesters, reported Literatureon such harvesters for recent years with different architectures, models, and results are presented. Table of power comparison betweenthe reported harvesters is presented and discussed.
Laser Acupuncture as a Treatment Option for Carpal Tunnel Syndrome Management: a Case Series
Limanjaya Iwan,Haris Salim,Nareswari Irma 사단법인약침학회 2022 Journal of Acupuncture & Meridian Studies Vol.15 No.3
Carpal tunnel syndrome (CTS) is disease that gives burdens for many countries, with a few choices for the management such as drugs or surgery, each has side effects that decrease the quality of life. Acupuncture is proven to be an effective treatment for pain and can restore nerve functions, and laser acupuncture is one of the modalities. This study aims to assess the effectiveness of laser acupuncture with total sample of 3 patients (6 wrists) mostly with tingling sensations and the outcomes are Boston questionnaire (BCTQ), visual analogue scale (VAS), Tinel sign, Phalen sign, and parameters of nerve conduction study (NCS). Acupuncture points used here are PC6, PC7, EXUE9, and LI4. The results show a decrease in NCS grades for 3 wrists, all wrists have BCTQ score improvements, a decrease in VAS, but no significant improvement in Tinel and Phalen signs. It is concluded that laser acupuncture can be used as a treatment option for the management of carpal tunnel syndrome.
Nurdin Muhammad,Watoni Abdul Haris,Natsir Muhammad,Rahmatilah Sarifa,Maulidiyah Maulidiyah,Wibowo Dwiprayogo,Salim La Ode Agus,Sadikin Siti Naqiyah,Bijang Catherina Manukpadang,Umar Akrajas Ali 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
The modification of ternary metal oxide to improve the photoelectrocatalysis (PEC) properties of TiO2 photocatalyst is a hot issue in environmental and resource applications. Herein, we present a novel photoelectrocatalytst of Se doped-TiO2/Ti nanotube arrays (Se@TiO2/Ti-NTAs) for high-efficiency degradation of diazinon pesticide. The Se@TiO2/Ti-NTAs were prepared to treat the TiO2-NTAs in Se-TiO2 sol-gel for 10 min, which was followed by calcination in air at 200 °C for 1 h. Optical absorption spectroscopy of the Se@TiO2/Ti-NTAs indicated that there is a red-shift in the optical energy gap to 2.95 eV if compared to the pristine TiO2/Ti NTAs, which suggests that the new photoelectrocatalyst is photoactive under visible light irradiation. We evaluated the photoactivity of the sample by using it as the photoelectrocatalyst in the degradation of diazinon pesticides under the PEC process. The results showed that the Se@TiO2/Ti-NTAs can degrade 95.62% for 1 h under visible light irradiation, which is equivalent to the degradation rate constant of 0.0183 s−1. For comparison, the pristine TiO2/Ti NTAs only degrades the diazinon as high as 87.65%, even then under UV light irradiation. Our result also indicated that the Se@TiO2/Ti-NTAs promote active photoelectron transfer and active radical formation, such as •OH and •O − 2 , for rapid diazinon pesticide degradation. The Se@TiO2/Ti-NTAs photoelectrode should be a potential platform for environmental pollution treatment.
Nanocomposite design of graphene modified TiO2 for electrochemical sensing in phenol detection
Muhammad Nurdin,Maulidiyah Maulidiyah,Abdul Haris Watoni,Armawansa Armawansa,La Ode Agus Salim,Zul Arham,Dwiprayogo Wibowo,Irwan Irwan,Akrajas Ali Umar 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1
This study is the stage of developing a phenol detection electrochemical sensor. Phenol is one of the organic pollutants harmful to human life and ecosystems. The development of this sensor was carried out by studying the use of TiO2 anatase as a modifier of graphene electrodes. The mass of TiO2 anatase was varied, while the mass of graphene and paraffin was fixed. The results showed that the TiO2 mass of 1.0 g was the best mass as a graphene electrode modifier. The use of this mass increases the oxidation current (Ipa) of phenol by 450 A, which is observed at an oxidation potential (Epa) of −0.30 V. The presence of interfering ions such as K+, Fe2+, and OH− can decrease the measurement current. However, based on the %RSD value, it shows that the performance of TiO2-graphene is in a good category, where the %RSD value obtained is 0.6%. TiO2-graphene electrodes can be used repeatedly for 12 days. Overall, this work demonstrates the potential of TiO2-graphene electrodes as electrode candidates for electrochemical-based phenol sensors.