Aim: This study explored the health beliefs, concerns and expectations of primary care patients presenting with abdominal pain, headache and chest pain. Methods: Over a 6-week period, 107 adult patients with symptoms of pain were interviewed using a semistructured questionnaire. Results: The presenting symptoms of these patients were: abdominal pain, 41; headache, 35; and chest pain, 31. Females made up 53.3%; the ethnic groups were Malay (35.5%), Chinese (18.7%) and Indian (45.8%); and 71.8% of the patients had primary or secondary education. The patients' attributions of their symptoms were predominantly non-medical in all three ethnic groups. The non-medical causes mentioned include food, trauma, stress, weather changes and winds ('angin'). Only two fifths of the patients mentioned disease-specific concerns. Three quarters of these patients expected either medications or wanted the doctor to look for serious causes. Very few patients specifically wanted referral or special tests. Conclusions: The patients in the study had health beliefs and concerns, in view of their non-medical focus, that was at variance with those of the health care providers. However, having decided to consult the health clinic, they were mainly looking for symptomatic relief or evaluation for serious pathology.
The aim of the present study was to investigate the potential sources of heavy metals in fine air particles (PM2.5) and benzene, toluene, ethylbenzene, and isomeric xylenes (BTEX) in gas phase indoor air. PM2.5 samples were collected using a low volume sampler. BTEX samples were collected using passive sampling onto sorbent tubes and analyzed using gas chromatography-mass spectrometry (GC-MS). For the lower and upper floors of the evaluated building, the concentrations of PM2.5 were 96.4 ± 2.70 μg/m3 and 80.2 ± 3.11 μg/m3, respectively. The compositions of heavy metals in PM2.5 were predominated by iron (Fe), zinc (Zn), and aluminum (Al) with concentration of 500 ± 50.07 ng/m3, 466 ± 77.38 ng/m3, and 422 ± 147.38 ng/m3. A principal component analysis (PCA) showed that the main sources of BTEX were originated from vehicle emissions and exacerbate because of temperature variations. Hazard quotient results for BTEX showed that the compounds were below acceptable limits and thus did not possess potential carcinogenic risks. However, a measured output of lifetime cancer probability revealed that benzene and ethylbenzene posed definite carcinogenic risks. Pollutants that originated from heavy traffic next to the sampling site contributed to the indoor pollution.
The study presents a meshless computational approach for simulating the three-dimensional multi-term time-fractional mobile-immobile diffusion equation in the Caputo sense. The methodology combines a stable Crank-Nicolson time-integration scheme with the definition of the Caputo derivative to discretize the problem in the temporal direction. The spatial function derivative is approximated using the inverse multiquadric radial basis function. The solution is approximated on a set of scattered or uniform nodes, resulting in a sparse and well-conditioned coefficient matrix. The study highlights the advantages of meshless method, particularly their simplicity of implementation in higher dimensions. To validate the accuracy and efficacy of the proposed method, we performed numerical simulations and compared them with analytical solutions for various test problems. These simulations were carried out on computational domains of both rectangular and non-rectangular shapes. The research highlights the potential of meshless techniques in solving complex diffusion problems and its successful applications in groundwater contamination and other relevant fields.