Investigation into the effect of beam shape on melt pool characteristics using analytical modelling

An established analytical model is used to simulate an extended laser beam. Multiple Gaussian sources are superimposed to form a rectangular beam and results are compared with a single circular Gaussian source model as well as experimental results from a high power diode laser with a rectangular beam. Melt depth, and melt pool profile and progression have been predicted by modelling which are compared with experimental results from melting of Inconel 625. The model produced is shown to give a reasonable prediction of melt pool shape and can be usefully employed to help optimise overlap required for laser surface processing applications. The value of absorptivity used in the model can be used as a fitting parameter to optimise the match between experimental and predicted results

Polyethylene-co-acrylic acid as coating for biosensor application: A quartz crystal microbalance study

10.1021/la020507iLangmuir18259932-9936LANG

Guidelines on management of prostate cancer

Annals of the Academy of Medicine Singapore424190-199AAMS

Clinics in diagnostic imaging (38)

Singapore Medical Journal406430-433SIMJ

Pangium edule reinw: A promising non-edible oil feedstock for biodiesel production

Biodiesel production from non-edible feedstocks is currently drawing much attention due to legitimate concerns about the effects of using edible oil for fuel. Pangium edule Reinw is a non-edible feedstock. Pangium is a tall tree native to the Micronesia, Melanesia and the mangrove swamps of South-East Asia. In this study, biodiesel production and characterization from P. edule oil was reported. The seeds were obtained from Bogor, Indonesia. The oil was found to have an acid value of 19.62 mg KOH/g oil. Therefore, a two-step acid-base-catalysed transesterification was used to produce biodiesel. This was followed by evaluating the physical and chemical properties of biodiesel and its blends with diesel. It has been found that the determined properties of P. edule methyl ester indicate that the oil can be considered as a future biodiesel source. The most remarkable feature of P. edule is its cloud, pour and cold filter plugging points. This biodiesel yielded cloud, pour and cold filter plugging points of -6, -4 and -8 A degrees C, respectively. This indicates the viability of using this biodiesel in cold countries. Therefore, it is suggested that more research should be conducted on P. edule for future biodiesel production

UGT1A1 haplotype mutation among Asians in Singapore

10.1159/000209851Neonatology963150-15

Serological evidence of possible human infection with Tioman virus, a newly described paramyxovirus of bat origin

Tioman virus, a relatively new paramyxovirus, was isolated from fruit bats (Pteropus species) on Tioman Island, Malaysia, in 2001. The objective of this study was to determine the prevalence of antibodies to T. virus in island inhabitants, by use of comparative ELISA and serum neutralization assays. Of the 169 human sera analyzed, 5 (approximately 3.0%) were positive for T. virus, by comparative ELISA. Of these 5 sera, 3 (1.8% of the total) had neutralizing antibodies against T. virus, suggesting previous infection of this study population by this virus or a similar virus

Genome anatomy of Streptococcus parasanguinis strain C1A, isolated from a patient with acute exacerbation of chronic obstructive pulmonary disease, reveals unusual genomic features

10.1128/genomeA.00541-15Genome Announcements33e00541-1

The efficacy of influenza vaccination in healthcare workers in a tropical setting: A prospective investigator blinded observational study

Annals of the Academy of Medicine Singapore376465-46