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| 1 | 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显示文摘This work investigated the microstructure evolution, tensile, impact, hardness, and sliding wear properties of an Al–20Mg_2Si–2Cu in situ composite treated with different Bi contents. The desired modification of primary Mg_2 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 Al_8 MgB iS i4 compound before the precipitation of the primary Mg_2 Si. Additionally, the structure of the pseudo-eutectic Mg_2 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 Al_5 Fe Si(β), Al_2Cu(θ) and Al_5Cu_2Mg_8Si_6(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 Mg_2 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 Mg_2 Si particles. | Saeed Farahany Hamidreza Ghandvar Nur Azmah Nordin Ali Ourdjini Mohd Hasbullah Idris | 2016 | Journal of Materials Science & Technology2016，32，11： | 7 |
| 2 | Survival analysis and mortality predictors of hospitalized severe burn victims in a Malaysian burns intensive care unit显示文摘Background:Prognostic measures to determine burn mortality are essential in evaluating the severity of individual burn victims.This is an important process of triaging patients with high risk of mortality that may be nursed in the acute care setting.Malaysian burn research is lacking with only one publication identified which describes the epidemiology of burn victims.Therefore,the objective of this study was to go one step further and identify the predictors of burn mortality from a Malaysian burns intensive care unit(BICU)which may be used to triage patients at higher risk of death.Methods:This is a retrospective cohort study of all admissions to Hospital Sultan Ismail’s BICU from January 2010 till October 2015.Admission criteria were in accordance with the American Burn Association guidelines,and risk factors of interest were recorded.Data was analyzed using simple logistic regression to determine significant predictors of mortality.Survival analysis with time to death event was performed using the Kaplan-Meier survival curve with log-rank test.Results:Through the 6-year period,393 patients were admitted with a male preponderance of 73.8%.The mean age and length of stay were 35.6(±15.72)years and 15.3(±18.91)days.There were 48 mortalities with an overall mortality rate of 12.2%.Significant risk factors identified on simple logistic regression were total body surface area(TBSA)>20%(p<0.001),inhalation injury(p<0.001)and presence of early systemic inflammatory response syndrome(SIRS)(p<0.001).Survival analysis using Kaplan-Meier survival curve showed similar results with TBSA>20%,presence of SIRS,mechanical ventilation and inhalation injury which were associated with poorer survival(p<0.001).Conclusion:The predictors of mortality identified in a Malaysian BICU were TBSA>20%,early SIRS,mechanical ventilation and inhalation injury which were associated with poorer survival outcome.The immunological response differs from individual patients and influenced by the severity of burn injury.Early SIRS on admission is an important predictor of death and may represent the severity of burn injury.Patients who required mechanical ventilation were associated with mortality and it is likely related to the severity of pulmonary insults sustained by individual patients.This data is important for outcome prognostication and mortality risk counselling in severely burned patients. | Henry Tan Chor Lip Jih Huei Tan Mathew Thomas Farrah-Hani Imran Tuan Nur’Azmah Tuan Mat | 2019 | Burns & Trauma2019，7，1： | 4 |
| 3 | Refinement of Mg 2 Si reinforcement in a commercial Al–20%Mg 2 Si in-situ composite with bismuth, antimony and strontium显示文摘 | Nur Azmah Nordin Saeed Farahany Ali Ourdjini Tuty Asma Abu Bakar Esah Hamzah | 2013 | Materials Characterization2013，，： | 1 |
| 4 | Effect of a two-step solution heat treatment on the microstructure and mechanical properties of 332 aluminium silicon cast alloy 显示文摘 | Azmah Hanim M A Chung Chang | 2011 | Materials and Design2011，，3： | 1 |
| 5 | Clinical characteristics of 1653 injured motorcyclists and factors that predict mortality from motorcycle crashes in Malaysia显示文摘Purpose: Amongst the ASEAN countries, Malaysia has the highest road fatality risk (>15 fatalities per 100 000 population) with 50% of these fatalities involving motorcyclist. This contributes greatly to ward admissions and poses a significant burden to the general surgery services. From mild rib fractures to severe intra-abdominal exsa nguinations, the spectrum of cases man aged by surgeons resulting from motorcycle accidents is extensive. The objective of this study is to report the clinical characteristics and identify predictors of death in motorcycle traumatic injuries from a Malaysian trauma surgery centre. Methods: This is a prospective cross-sectional study of all injured motorcyclists and pillion riders that were admitted to Hospital Sultanah Aminah and treated by the trauma surgery team from May 2011 to February 2015. Only injured motorcyclists and pillion riders were included in this study. Patient demography and predictors leading to mortality were identified. Significant predictors on univariate analysis were further analysed with multivariate analysis. Results: We included 1653 patients with a mean age of (35 ± 16.17) years that were treated for traumatic injuries due to motorcycle accidents. The mortality rate was 8.6%(142) with equal amount of motorcycle riders (788) and pillion riders (865) that were injured. Amongst the injured were male predominant (1 537) and majority of ethnic groups were the Malays (897) and Chinese (350). Severity of injury was reflected with a mean Revised Trauma Score (RTS) of 7.31 ± 1.29, New Injury Severity Score (NISS) of 19.84 ± 13.84 and Trauma and Injury Severity Score (TRISS) of 0.91 ± 0.15. Univariate and multivariate analysis revealed that age>35, lower GCS, head injuries, chest injuries, liver injuries, and small bowel injuries were significant predictors of motorcycle trauma related deaths with p < 0.05. Higher trauma severity represented by NISS, RTS and TRISS scores was also significant for death with p < 0.05. Conclusion: Age, lower GCS, presence of head, chest, liver, small bowel injuries and higher severity on NISS, RTS and TRISS scores are predictive of death in patients involved w让h motorcycle accidents. This information is important for prognostic mortality risk prevention and counselling. | Henry Tan Chor Lip Jih Huei Tan Yuzaidi Mohamad Affirul Chairil Ariffin Rizal Imran Tuan Nur 'Azmah Tuan Mat | 2019 | Chinese Journal of Traumatology2019，22，2： | 1 |
| 6 | Critical adjustments and trauma surgery trends in adaptation to COVID-19 pandemic in Malaysia显示文摘Malaysia has one of the highest total numbers of COVID-19 infections amongst the Southeast Asian nations,which led to the enforcements of the Malaysian'Movement Control Order'to prohibit disease transmission.The overwhelming increasing amount of infections has led to a major strain on major healthcare services.This leads to shortages in hospital beds,ventilators and critical personnel protective equipment.This article focuses on the critical adaptations from a general surgery department in Malaysia which is part of a Malaysian tertiary hospital that treats COVID-19 cases.The core highlights of these strategies enforced during this pandemic are:(1)surgery ward and clinic decongestions;(2)deferment of elective surgeries;(3)restructuring of medical personnel work force;(4)utilization of online appli cations for tele-communication;(5)operating room(OR)adjustments and patient screening;and(6)continuing medical education and updating practices in context to COVID-19.These adaptations were important for the continuation of emergency surgery services,preventing transmission of COVID-19 amongst healthcare workers and optimization of medical personnel work force in times of a global pandemic.In addition,an early analysis on the impact of COVID-19 pandemic and lockdown measures in Malaysia towards the reduction in total number of elective/emergent/trauma surgeries performed is described in this article. | Henry Tan Chor Lip Tan Jih Huei Yuzaidi Mohamad Rizal Imran Alwi Tuan Nut'Azmah Tuan Mat | 2020 | Chinese Journal of Traumatology2020，23，4： | 0 |
| 7 | Design of crashworthy attenuator structures as a part of vehicle safetyagainst impact:Application of waste aluminum can-based material显示文摘The impact attenuator is an essential system in both race cars and urban vehicles.The structure of animpact attenuator serves as a safety barrier between the impacted surface and the driver in an accident.Attenuator materials tend to have a high price;thus,alternative materials were explored in the currentwork,i.e.,used cans from food and beverage containers.The study deployed a nonlinear finite elementalgorithm to calculate a series of impacts on the attenuator structures.The thickness of the cans andvelocity of the impact were considered as the main parameters.Analysis results concluded that the at-tenuator’s average energy was 16000 J for a can thickness of 1 mm.This value is more than two times the0.5 mm thick used cans.The attenuator’s new design was then matched with an attenuator regulation,and the results surpassed the standard value of 7350 J. | Laksmana Widi Prasetya Aditya Rio Pr abowo Ubaidillah Ubaidillah Iwan Istanto Nur Azmah Binti Nordin | 2021 | Theoretical & Applied Mechanics Letters2021，11，2： | 0 |
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