5 research outputs found

    The effect of different type of additives on friction and wear of MNR grease

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    Grease typically has a base of mineral or synthetic oil, a thickener, additives, and fillers. The tribological performance of grease depends on the viscosity of the base oil and the type and concentration of thickening agent used. Grease lubricants are used in many different parts of automobiles, including gears, cams, sealed ball bearings, and others. Having to use more energy to overcome vehicle friction is wasteful. Power consumption can be drastically cut if frictional losses are minimised, making the components more effective. Grease lubrication helps keep surfaces apart, reducing friction and wear for increased durability. Prepared by sonicating the grease supplied by MNR Multitech Sdn Bhd using an ultrasonic homogenizer, the produced greases had a 10% concentration of additive nanoparticles of varying types mixed in. To put it simply, MNR is a grease that has no additives added to it. Molybdenum disulfide (MoS2), lithium complex grease (LCG), and potassium (MNR + K) are some of the other additives that have been introduced (K). Tribological tests were conducted using a 4-Ball Tester in accordance with the American Society for Testing and Materials (ASTM) standards D 2266 for Wear Preventive Characteristics of Lubricating Grease (Four-Ball Method) and 2596 for measurement of Extreme-Pressure Properties of Lubricating Grease (Four-Ball Method). The testing results show that the addition of MoS2 additives to MNR base grease can increase its friction and wear qualities by 52% and 68%, respectively. Extreme pressure testing revealed that MNR + MoS2 grease reduced severe adhesive wear and increased load carrying capability by nearly double that of MNR grease, from 618.03 N to 784.8 N. As a result, the load-carrying capacity and the friction coefficient have both been drastically increased thanks to the additive's use in bearing

    Sistem ‘Indus-Train’: medium pemantauan dan penilaian pelajar semasa latihan industri / Amminudin Ab Latif … [et al.]

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    Latihan industri merupakan satu kursus wajib dalam program Diploma Kejuruteraan Awam, UiTM Pahang bagi memberi pendedahan amalan kejuruteraan yang sebenar kepada para pelajar dan untuk memenuhi keperluan kelayakan akreditasi 'Engineering Technician Accreditation Council'(ETAC). Namun begitu, proses penilaian dan pemantauan ke atas pelajar yang menjalani latihan industri adalah tidak sistematik kerana buku log tidak lengkap, rubrik pemarkahan tidak spesifik, penilaian oleh pensyarahyang bukan dalam bidang kepakarannya, tiada dan tidak berkala lawatan dan pemeriksaan ke tapak oleh penyelia fakulti, tiada pemantauan aktiviti harian oleh penyelia fakulti serta laporan akhir tidak berformat. Dalam era globalisasi kini, kaedah ini seharusnya perlu ditambahbaik bagi memastikan latihan industri pelajar lebih sistematik, berdaya saing, mengurangkan kos pengurusan serta mencapai kelestarian dalam penilaian latihan industri. Oleh itu, sistem 'Indus-Train' telah dibangunkan oleh Kumpulan Inovatifdan Kreatif(KIK) (CivTEX), FKA UiTM Pahang bagi membantu jabatan menyelesaikan masalah-masalah yang berbangkit berkaitan dengan pemantauan dan penilaian latihan industri. Impakpositif utamayang diperoleh adalahpeningkatan pencapaianpelajar dalam hasil kursus (CO) secara spesifiknya COl iaitu peningkatan 13.2%. Disamping itu,sistem ini juga menjimatkan masa dan mengurangkan kos. Nilai tambah sistem ini adalah sijil latihan industri dapat dicetak pada akhir semester dan melalui kod bar sijil ini, ia dapat diimbas menggunakan aplikasi khas telefon pintar untuk melihat segala laporan aktiviti-aktiviti pelajar ketika menjalani latihan industri. Sijil ini boleh dijadikan salah satu dokumen bagi tujuan permohonan pekerjaan

    Potassium fertilisation reduced late embryogenesis abundant (LEA) gene expression in Malaysian rice (MR220) under water stress condition

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    The application of potassium fertiliser might mitigate water stress effects in developing rice, thus influencing Late Embryogenesis Abundant (LEA) gene expression and growth in the plant tissue. This study was conducted to examine LEA gene expression in its drought tolerance mechanisms and the growth of Malaysian Rice (MR220) when exposed to water stress and potassium fertilisation. Three treatments were developed, namely the control (CF; Continuously flooding + 80 kg K2O/ha), water stress under standard potassium fertilisation (WS; Water Stress 25 days + 80 kg K2O/ha) and water stress under high potassium fertilisation (WSK; Water Stress 25 days + 120 kg K2O/ha). The plant growth and yield components were measured for each treatment with randomly tagged plant by 3 replicates. The result showed that LEA gene expression on WSK was 36% less than on WS, thus indicating that the application of additional potassium fertilisation on MR220 rice might mitigate the water stress effect imposed on this plant. The study showed that high LEA gene expression in WS was accompanied by a reduction in plant growth and yield performance, such as plant tillers, height, number of leaves and grain yield compared to the control and WSK. © 2019 the Author(s)

    Shading effects on leaf gas exchange, leaf pigments and secondary metabolites of polygonum minus huds., an aromatic medicinal herb

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    The growing demand for high value aromatic herb Polygonum minus-based products have increased in recent years, for its antioxidant, anticancer, antimicrobial, and anti-inflammatory potentials. Although few reports have indicated the chemical profiles and antioxidative effects of Polygonum minus, no study has been conducted to assess the benefits of micro-environmental manipulation (different shading levels) on the growth, leaf gas exchange and secondary metabolites in Polygonum minus. Therefore, two shading levels (50%:T2 and 70%:T3) and one absolute control (0%:T1) were studied under eight weeks and 16 weeks of exposures on Polygonum minus after two weeks. It was found that P. minus under T2 obtained the highest photosynthesis rate (14.892 µmol CO2 m−2 s−1), followed by T3 = T1. The increase in photosynthesis rate was contributed by the enhancement of the leaf pigments content (chlorophyll a and chlorophyll b). This was shown by the positive significant correlations observed between photosynthesis rate with chlorophyll a (r2 = 0.536; p ≤ 0.05) and chlorophyll b (r2 = 0.540; p ≤ 0.05). As the shading levels and time interval increased, the production of total anthocyanin content (TAC) and antioxidant properties of Ferric Reducing Antioxidant Power (FRAP) and 2,2-Diphenyl-1-picrylhydrazyl (DPPH) also increased. The total phenolic content (TPC) and total flavonoid content (TFC) were also significantly enhanced under T2 and T3. The current study suggested that P.minus induce the production of more leaf pigments and secondary metabolites as their special adaptation mechanism under low light condition. Although the biomass was affected under low light, the purpose of conducting the study to boost the bioactive properties in Polygonum minus has been fulfilled by 50% shading under 16 weeks’ exposure
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