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Theoretical & Applied Mechanics Letters 2021年第2期11卷 85-93页

作者： Laksmana Widi Prasetya Aditya Rio Pr abowo Ubaidillah Ubaidillah Iwan Istanto nur azmah binti nordin Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia Agency for the Assessment and Application of Technology(BPPT) Jakarta 10340Indonesia Malaysia-Japan International Institute of Technology-Universiti Teknologi Malaysia Kuala Lumpur 54100Malaysia

The impact attenuator is an essential system in both race cars and urban *** structure of animpact attenuator serves as a safety barrier between the impacted surface and the driver in an *** materials tend to have a high price;thus,alternative materials were explored in the currentwork,i.e.,used cans from food and beverage *** study deployed a nonlinear finite elementalgorithm to calculate a series of impacts on the attenuator *** thickness of the cans andvelocity of the impact were considered as the main *** results concluded that the at-tenuator’s average energy was 16000 J for a can thickness of 1 *** value is more than two times the0.5 mm thick used *** attenuator’s new design was then matched with an attenuator regulation,and the results surpassed the standard value of 7350 J.

关键词： Attenuator structure Waste can Vehicle safety Crashworthiness analysis Impact phenomenon

Effect of Primary and Eutectic Mg_2Si Crystal Modifications on the Mechanical Properties and Sliding Wear Behaviour of an Al–20Mg_2Si–2Cu–xBi Composite

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Journal of Materials Science & Technology 2016年第11期32卷 1083-1097页

作者： Saeed Farahany Hamidreza Ghandvar nur azmah nordin Ali Ourdjini Mohd Hasbullah Idris Department of Materials and Mechanical Engineering Buein Zahra Technical University Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia (UTM) Department of Mechanical Engineering Faculty of Engineering University of Ottawa

This work investigated the microstructure evolution, tensile, impact, hardness, and sliding wear properties of an Al–20Mg2Si–2Cu in situ composite treated with different Bi contents. The desired modification of primary Mg2 Si particles was achieved with the addition of 0.4 wt% Bi. Increasing Bi beyond 0.4 wt%resulted in a loss of modification, possibly due to the formation of Al8 MgB iS i4 compound before the precipitation of the primary Mg2 Si. Additionally, the structure of the pseudo-eutectic Mg2 Si was transformed from plate to fibrous, which was consistent with decrease of growth temperature extracted from the cooling curve thermal analysis. Addition of Bi had an effect on the morphology of Al5 Fe Si（β）, Al2Cu（θ） and Al5Cu2Mg8Si6（Q） intermetallic compounds. The tensile strength, elongation percentage, impact toughness, and hardness increased by 6%, 13%, 75%, and 23%, respectively, due to modification of both the primary and eutectic Mg2 Si crystals. The tensile and impact fracture surfaces showed fewer decohered particles in the Bi-treated composite. The enhancement in wear resistance of the Bi-treated composite could be attributed to solid lubricant function of insoluble soft Bi phase and modification effects on Mg2 Si particles.

关键词： Al–Mg2Si Composite Modification Bismuth Mechanical properties Wear

Non-Isothermal Crystallization Kinetics of a Rapidly Solidified as-Cast TiZrHfNiCu High Entropy Bulk Metallic Glass

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World Journal of Engineering and Technology 2020年第3期8卷 280-295页

作者： Norhuda Hidayah nordin Faiz Syazwan Mohamad nur Ayuni Jamal International Islamic University Malaysia Selangor Malaysia

This paper aims to investigate the thermal behavior and crystallization kinetics of TiZrHfNiCu high entropy bulk metallic glass (HE-BMG) alloy using the standard procedure of Differential Scanning Calorimetric (DSC) annealing technique. The alloy was produced using an arc melting machine with a critical diameter of 1.5 mm. The crystallization kinetics and phase transformation mechanism of TiZrHfNiCu HE-BMG was investigated under the isochronal condition at a single heating run based on the Johnson-Mehl- Avrami (JMA) theory. In isochronal heating, the apparent activation energy for glass transition and crystallization events was analyzed by Kissinger and Ozawa methods. The average activation energy value for crystallization of TiZrHfNiCu amorphous alloys in isochronal modes was 226.41 kJ/mol for the first crystallization and 297.72 kJ/mol for second crystallization stages. The crystallization mechanism of the first step was dominated by two- and three-dimensional growth with increasing nucleation rate, while the crystallization mechanism in the second stage was dominated by two-dimensional crystallization growth with a constant nucleation rate. The diffusion mechanism result proved the theory of sluggish atomic diffusion of HEA at elevated temperature.

关键词： Crystallization Kinetics High Entropy Bulk Metallic Glass Phase Transformation Sluggish Diffusion

Liposomes as immunological adjuvants and delivery systems in the development of tuberculosis vaccine:A review

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Asian Pacific Journal of Tropical Medicine 2022年第1期15卷 7-16页

作者： nur Ellene Mat Luwi Suhana Ahmad Ahmad Suhaimi nurfatihah Azlyna Asyikin nordin Maria Elena Sarmiento Armando Acosta Mohd Nor Norazmi Vuk Uskoković Rohimah Mohamud Ramlah Kadir Department of Immunology School of Medical SciencesUniversiti Sains Malaysia16150 Kubang KerianKelantanMalaysia School of Health Sciences Universiti Sains Malaysia16150 Kubang KerianKelantanMalaysia Department of Mechanical Engineering San Diego State UniversityCampanile Dr.5500San Diego 921982CAUSA TardigradeNano LLC IrvineCA 92604USA

Liposomes are phospholipid bilayer vesicles,which are biocompatible,biodegradable and nontoxic vehicles suitable for numerous drug and gene delivery *** this review,we discuss the prospect of using liposome technology in the development of a vaccine for *** remains an important health problem that requires the development of an effective vaccine,especially since the only approved vaccine for it continues to be the Bacille Calmette-Geurin(BCG)one developed 100 years *** review focuses on the different applications of liposomes toward achieving this *** liposomal formulations showing prospect in the research stage and in clinical trials are discussed.

关键词： Liposomes Tuberculosis vaccine Adjuvant Delivery system Tuberculosis

Removal of Hexavalent Chromium from Aqueous Solution by Adsorption on Palm Oil Fuel Ash (POFA)

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Journal of Geoscience and Environment Protection 2020年第2期8卷 112-127页

作者： nurulhana nordin nur Amirah Ahmad Asmadi Mohan Kumar Manikam Azhar Abdul Halim Marlia Mohd Hanafiah Sarah Nadira Hurairah Center for Earth Sciences and Environment Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia Centre for Tropical Climate Change System Institute of Climate Change Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

This study investigated the removal of hexavalent chromium, Cr(VI) from aqueous solution by adsorption using palm oil fuel ash (POFA), an agricultural waste from the palm oil industry. POFA adsorbent was characterized by X-ray diffraction (XRD) analysis. Batch adsorption study revealed that the optimum conditions for the removal were as follows: pH 2, adsorbent dosage 80 g/L and contact time of 6 min, which resulted in 92% removal and 0.464 mg/g maximum adsorption capacity. Adsorption isotherm and kinetic studies showed that Freundlich isotherm and pseudo-second-order kinetic models fitted best to the experimental data. Column adsorption study at 5 mL/min of flow rate showed that 90% removal was obtained at 2 min of contact time which represented its breakthrough point. The column reached saturation at 30 min and the maximum column adsorption capacity recorded was 0.412 mg/g. The column adsorption behavior showed good fit with both Thomas and Yoon-Nelson kinetic models. These findings suggested that the utilization of POFA as a low-cost adsorbent to remove Cr(VI) from wastewater, either in batch or fixed bed adsorption system is not only effective, but concurrently will help to reduce wastes from the palm oil industry.

关键词： Hexavalent Chromium Palm Oil Fuel Ash (POFA) Low Cost Adsorbent Adsorption Isotherms Adsorption Kinetics

Epidemiological observations of invasive group B Streptococcus infections in six major hospitals in Peninsular Malaysia

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Asian Pacific Journal of Tropical Medicine 2024年第9期17卷 384-391页

作者： AbdulRahman Muthanna Mohd Nasir Mohd Desa nurul Asyikin Abdul Rahman nurul Diana Dzaraly nurul Hana Zainal Baharin nur Afiza Aziz Chua Hui Shan Zalina Ismail Lailatul Akmar Mat Nor Marlindawati Mohd Ali nur Hanani Ahmad Mohammad Noor Amal Azmai Syafinaz Amin-nordin Department of Biomedical Sciences Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia School of Biology Faculty of Applied SciencesUniversiti Teknologi MARANegeri Sembilan72000 Kuala PilahMalaysia Department of Oral Biology&Biomedical Sciences Faculty of DentistryMAHSA University42610 JenjaromSelangorMalaysia School of Bioscience Faculty of Pharmacy and Biomedical SciencesMAHSA University42610 JenjaromSelangorMalaysia Department of Pathology Sultanah Aminah Hospital80100 Johor BahruJohorMalaysia Department of Pathology Melaka General Hospital75400 MelakaMalaysia Department of Medical Microbiology and Immunology Faculty of MedicineUniversiti Kebangsaan Malaysia56000 CherasKuala LumpurMalaysia Department of Pathology Sultan Idris Shah Serdang Hospital43000 KajangSelangorMalaysia Department of Pathology Tuanku Ja'afar Hospital70300 SerembanNegeri SembilanMalaysia Department of Pathology Sungai Buloh Hospital47000 Sungai BulohSelangorMalaysia Department of Biology Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Aquatic Animal Health and Therapeutics Laboratory Institute of BioscienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Medical Microbiology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Medical Microbiology Sultan Abdul Aziz Shah HospitalUniversiti Putra MalaysiaPersiaran MARDI-UPM43400SelangorMalaysia

Objective:To address the lack of research on invasive group B Streptococcus(GBS)infections in Malaysia and Southeast Asia through a comprehensive analysis of GBS isolates obtained from ***:Medical records from patients with GBS infection isolated from the sterile site,such as blood and cerebrospinal fluid from 14 July 2019 to 15 December 2020,were reviewed from six major hospitals in Peninsular *** criteria were invasive GBS,sterile sites and non-repeated GBS isolated from the same patients in the same *** isolates were re-identified for GBS and ***:A total of 118 patients were eligible,with a majority of non-pregnant adults(76.3%).Over half of the patients(62.7%)had underlying medical conditions,with diabetes as the most common disease,followed by respiratory disease,renal disease,cardiovascular disease and skin and soft tissue *** most common manifestations were sepsis,followed by soft tissue abscess,diabetic foot ulcer,wet gangrene and *** overall mortality was 7.6%.The most common serotype was serotype桋.Conclusions:Invasive GBS infection among non-pregnant adults showed a rising trend,particularly among diabetic *** study underscores the importance of reducing risk factors and highlights the necessity of developing GBS vaccination as a preventive strategy for both infants and adults.

关键词： Streptococcus agalactiae Group B Streptococcus Invasive GBS infections Malaysia