Search results for: S.M. Tang

Items from 1 to 20 out of 27 results

article

Ventilation heterogeneity and oscillometry predict asthma control improvement following step‐up inhaled therapy in uncontrolled asthma

Francesca S.M. Tang, Sandra Rutting, Catherine E. Farrow, Katrina O. Tonga, more

Background and objective Abnormal peripheral airway function is an important feature of asthma and relates to asthma symptoms and poor asthma control. We aimed to determine whether peripheral airway function, as measured by forced oscillatory impedance and multiple‐breath nitrogen washout (MBNW), relates to symptom improvement in asthmatic participants with uncontrolled asthma, after stepping up...

article

Differential neutrophil activation in viral infections: Enhanced TLR‐7/8‐mediated CXCL8 release in asthma

Francesca S.M. Tang, David Van Ly, Kirsten Spann, Patrick C. Reading, more

Respirology > 21 > 1 > 172 - 179

Background and objective Respiratory viral infections are a major cause of asthma exacerbations. Neutrophils accumulate in the airways and the mechanisms that link neutrophilic inflammation, viral infections and exacerbations are unclear. This study aims to investigate anti‐viral responses in neutrophils from patients with and without asthma and to investigate if neutrophils can be directly activated...

article

Chinese family with diffuse oesophageal leiomyomatosis: a new COL4A5/COL4A6 deletion and a case of gonosomal mosaicism

Wei Liu, John Kl Wong, Qiuming He, Emily Hm Wong, more

BMC Medical Genetics > 2015 > 16 > 1 > 1-8

Background Diffuse oesophageal leiomyomatosis (DOL) is a rare disorder characterized by tumorous overgrowth of the muscular wall of the oesophagus. DOL is present in 5 % of Alport syndrome (AS) patients. AS is a rare hereditary disease that involves varying degrees of hearing impairment, ocular changes and progressive glomerulonephritis leading to renal failure. In DOL-AS patients, the genetic defect...

article

Parallel-plate solar photocatalytic reactor for air purification: Semi-empirical correlation, modeling, and optimization

Michael K.H. Leung, S.M. Tang, Ringo C.W. Lam, Dennis Y.C. Leung, more

Solar Energy > 2006 > 80 > 8 > 949-955

This study focused on modeling and optimization of a photoreactor packed with parallel glass plates coated with sol–gel TiO ₂ thin films on both sides. The photoreactor design has great potential for solar photocatalytic air purification. Borosilicate glass substrate was selected because its high transmissivity facilitated the transmission and distribution of exterior solar radiation onto...

article

Tension-tension fatigue behavior of hydroxyapatite reinforced polyetheretherketone composites

S.M. Tang, P. Cheang, M.S. AbuBakar, K.A. Khor, more

International Journal of Fatigue > 2004 > 26 > 1 > 49-57

Hydroxyapatite (HA) particle reinforced polyetheretherketone (PEEK) composites with 5, 10, 20, 30, and 40% (by volume) HA content were subjected to tension-tension fatigue under load-controlled mode. Results of quasi-static tensile tests indicated that the tensile stiffness of the HA/PEEK composites increases while their tensile strength decreases, with an increase in HA content, up to 40% (by volume)...

article

Tensile properties, tension-tension fatigue and biological response of polyetheretherketone-hydroxyapatite composites for load-bearing orthopedic implants

M.S. Abu Bakar, M.H.W. Cheng, S.M. Tang, S.C. Yu, more

Biomaterials > 2003 > 24 > 13 > 2245-2250

Polyetheretherketone-hydroxyapatite composites were developed as alternative materials for load-bearing orthopedic applications. The amount of hydroxyapatite (HA) incorporated into the polyetheretherketone (PEEK) polymer matrix ranges from 5 to 40vol% and these materials were successfully fabricated by injection molding. This study presents the mechanical and biological behavior of the composite materials...

article

Proton beam micromachining: a new tool for precision three-dimensional microstructures

J.A. van Kan, A.A. Bettiol, B.S. Wee, T.C. Sum, more

Sensors & Actuators: A. Physical > 2001 > 92 > 1-3 > 370-374

Proton beam micromachining (PBM) is a novel technique for the production of high aspect-ratio three-dimensional (3D) microcomponents. PBM is a direct write process in which a focused beam of MeV protons is scanned in a pre-determined pattern over a suitable resist material (e.g. PMMA or SU-8) and the latent image formed is subsequently chemically developed. One strategy for full exploitation of the...

article

Radioactivity of neutron-irradiated cat’s-eye chrysoberyls

S.M. Tang, T.S. Tay

Nuclear Inst. and Methods in Physics Research, B > 1999 > 150 > 1-4 > 491-495

The recent report of marketing of radioactive chrysoberyl cat’s-eyes in South-East Asian markets has led us to use an indirect method to estimate the threat to health these color-enhanced gemstones may pose if worn close to skin. We determined the impurity content of several cat’s-eye chrysoberyls from Indian States of Orissa and Kerala using PIXE, and calculated the radioactivity that would be generated...

article

Analysis of Singapore marine sediments by PIXE

S.M. Tang, I. Orlic, X.K. Wu

Nuclear Inst. and Methods in Physics Research, B > 1998 > 136-138 > 1013-1017

Thirty eight core samples of sediment were collected from seven coastal zones around the Island of Singapore for the purpose of surveying the concentrations of metallic pollutants in the marine sediments. The samples were analyzed by means of the Proton-induced X-ray Emission (PIXE) technique to obtain the concentrations of the trace metals Cr, Mn, Ni, Cu, Zn, As and Pb. Some of them were also analyzed...

article

Nuclear microprobe analysis and imaging: Current state of the art performances

F. Watt, T. Osipowicz, T.F. Choo, I. Orlic, more

Nuclear Inst. and Methods in Physics Research, B > 1998 > 136-138 > 313-317

The current state-of-the-art performances claimed for nuclear microbeam spatial resolutions are: (a) 400 nm spot sizes for high current (100 pA) proton beams, (b) 400 nm for high current alpha particle beams, (c) 100 nm for low proton current (<0.1 pA) applications such as Scanning Transmission Ion Microscopy (STIM) and Ion Beam Induced Charge (IBIC) and (d 50 nm for low current alpha particles...

article

Analysis of dinosaur samples by nuclear microscopy

I. Orlić, S.M. Tang, X. Wu, Y. Wang, more

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 308-314

Several dinosaur bone and eggshell fossil samples unearthed at different sites in China were analyzed by means of nuclear microscopy. Concentrations and distributions of elements such as Na, Mg, Al, P, S, Ca, Cr, Mn, Fe, Cu, Zn, As, Br, Sr, Y, Ce, Pb and U, etc. were obtained for each sample. The results of quantitative PIXE and RBS analyses show unusually high concentrations of U and Ce in several...

article

TTPIXAN - The 4th generation

I. Orlić, K.K. Loh, S.C. Liew, Y.K. Ng, more

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 133-137

During the past six years the computer code TTPIXAN went through many changes and developments. From its infant stage when it was developed for a simple quantitative broad beam PIXE analysis, through a more sophisticated version suited for applications in Nuclear Microscopy (NM). At present, the program is finally reaching its mature stage or its 4th metamorphosis. It is now capable of not only simulating...

article

Micro-PIXE analysis of trace element concentrations of natural rubies from different locations in Myanmar

J.L. Sanchez, T. Osipowicz, S.M. Tang, T.S. Tay, more

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 682-686

The trace element concentrations found in geological samples can shed light on the formation process. In the case of gemstones, which might be of artificial or natural origin, there is also considerable interest in the development of methods that provide identification of the origin of a sample. For rubies, trace element concentrations present in natural samples were shown previously to be significant...

article

A PIXE micro-tomography experiment using MLEM algorithm

Y.K. Ng, I. Orlic, S.C. Liew, K.K. Loh, more

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 109-112

A new approach for PIXE tomography has recently been introduced by our group. The reconstruction program is based on the maximum likelihood expectation maximization (MLEM) algorithm. Since the algorithm is built upon the actual stochastic model of X-ray production and propagation, attenuation correction as well as ion energy loss are readily incorporated into the reconstruction. The resultant procedures...

article

Nuclear microscopy of single whole cultured cells: Beam damage studies

F. Watt, P.S.P. Thong, A.H.M. Tan, S.M. Tang

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 188-191

Elemental analysis of individual whole cultured cells using Particle Induced X-ray Emission (PIXE), Scanning Transmission Ion Microscopy (STIM) and Rutherford Backscattering Spectrometry (RBS) can yield quantitative results at the parts per million level. During a continuous scan over a single cell using 2 MeV protons (with a beam current of 100 pA, spot size of 1 μm), elemental loss was monitored...

article

Nuclear microscopy study of fish scales

S.M. Tang, I. Orlic, K.N. Yu, J.L. Sanchez, more

Nuclear Inst. and Methods in Physics Research, B > 1997 > 130 > 1-4 > 396-401

Fish scales are useful to ichthyologists for purposes of classification, identification, age determination and history study. So far, all studies of fish scales, for whatsoever purposes, have relied on the use of optical or electron microscopes to study their form and structure. Employing the NUS nuclear microscope, we measured the concentrations of Sr, Zn, Fe, Mn, Ni, Cu, Cr, As, Se, Br and Pb in...

article

Preparation of CuAlNi-based shape memory alloys by mechanical alloying and powder metallurgy method

S.M. Tang, C.Y. Chung, W.G. Liu

Journal of Materials Processing Tech. > 1997 > 63 > 1-3 > 307-312

The conventional cast shape memory alloys (SMA) billets can be hot worked into components with uniform cross sections. However, near-net shape components can be made more easily by the powder metallurgy method which can save a lot of hot working procedures and thus simplify the fabrication process. The elemental powders are pre-alloyed by high energy ball milling, thus mechanical alloying process...

article

Air Pollution in Singapore: Its Multielemental Aspect as Measured by Nuclear Analytical Techniques

I. Orlić, Bao Wenlan, F. Watt, S.M. Tang

Environmental Monitoring and Assessment > 1997 > 44 > 1-3 > 455-470

Aerosol samples were collected in 1994 in Singapore on two occasions: once in June during the normal meteorological conditions and later in October during a long haze period caused by the heavy forest fire in Indonesia. Filtration and impaction collection methods were used simultaneously so that detailed elemental analysis of bulk as well as of different size fractions could be performed. Accelerator...

article

Analysis of stoichiometry of high-Tc superconducting films by RBS and PIXE methods

R. Šandrik, M. Jergel, V. Štrbik, K. Nakamura, more

Nuclear Inst. and Methods in Physics Research, B > 1996 > 118 > 1-4 > 602-607

Lateral inhomogeneity has been studied in thin films of YBa ₂ Cu ₃ O _{7 − δ} deposited from aerosol on MgO substrates. RBS and PIXE analyses distinguished areas that were found to differ in the critical temperature T _c values. The PIXE results confirmed the differences in composition between those areas. Variations in layer thicknesses were found by means of RBS analysis...

article

Nuclear microscopy of individual atmospheric aerosol particles

I. Orlić, Y.K. Ng, F. Watt, S.M. Tang

Journal of Aerosol Science > 1996 > 27 > Supplement 1 > S661-S662

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Search results for: S.M. Tang

Ventilation heterogeneity and oscillometry predict asthma control improvement following step‐up inhaled therapy in uncontrolled asthma

Differential neutrophil activation in viral infections: Enhanced TLR‐7/8‐mediated CXCL8 release in asthma

Chinese family with diffuse oesophageal leiomyomatosis: a new COL4A5/COL4A6 deletion and a case of gonosomal mosaicism

Parallel-plate solar photocatalytic reactor for air purification: Semi-empirical correlation, modeling, and optimization

Tension-tension fatigue behavior of hydroxyapatite reinforced polyetheretherketone composites

Tensile properties, tension-tension fatigue and biological response of polyetheretherketone-hydroxyapatite composites for load-bearing orthopedic implants

Proton beam micromachining: a new tool for precision three-dimensional microstructures

Radioactivity of neutron-irradiated cat’s-eye chrysoberyls

Analysis of Singapore marine sediments by PIXE

Nuclear microprobe analysis and imaging: Current state of the art performances

Analysis of dinosaur samples by nuclear microscopy

TTPIXAN - The 4th generation

Micro-PIXE analysis of trace element concentrations of natural rubies from different locations in Myanmar

A PIXE micro-tomography experiment using MLEM algorithm

Nuclear microscopy of single whole cultured cells: Beam damage studies

Nuclear microscopy study of fish scales

Preparation of CuAlNi-based shape memory alloys by mechanical alloying and powder metallurgy method

Air Pollution in Singapore: Its Multielemental Aspect as Measured by Nuclear Analytical Techniques

Analysis of stoichiometry of high-Tc superconducting films by RBS and PIXE methods

Nuclear microscopy of individual atmospheric aerosol particles

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