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Search for a New Li-based Scintillator for Neutron Detection
Sajid Khan,김홍주,박환배,Bibi Ruqia,J. Y. Lee,U. Fawad,김성환,강상준 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.8
Li-based scintillators are promising candidates for thermal neutron detection due to the presence of 6Li nuclei in the host lattice. In this study, pure and doped lithium iodide (LiI) crystals are grown by using the two-zone vertical Bridgman technique with diameters of 1 cm and lengths of 4 cm. The crystals were doped with Na, CO3 and Tl activators with the aim to develop a scintillator having enhanced neutron detection efficiency. Among the grown crystals, LiI(Tl) showed the highest luminescence intensity under X-ray excitation. The LiI(Tl) crystal exhibited a broad emission spectrum between 300 and 700 nm peaking at 470 nm. Under -ray excitation, The LiI(Tl) crystal showed two decay-time components of 180 ns and 900 ns, respectively. The response of the LiI(Tl) crystal to spallation neutrons and the radiation damage effects were determined at the Korea Multi-purpose Accelerator Complex (KOMAC). A clear neutron capture peak was measured at 3 MeVee under spallation-neutron irradiation.
Sajid Adhi Raja,Vui Heng Chong,Noor A. Rahman,Lilabi M P Shakir,Joe Knights 대한안과학회 2022 Korean Journal of Ophthalmology Vol.36 No.1
Purpose: To determine the prevalence of diabetic retinopathy (DR) and the factors associated with retinopathy among type2 diabetes mellitus (DM) patients in Brunei Darussalam. Methods: Cross-sectional study of all type 2 DM patients who attended diabetic eye screening over a 3-month period at oneof four government hospitals. We assessed association between DR with the following variables: age, sex, glycated hemoglobin(HbA1c), duration of DM, hypertension, hyperlipidemia, and microalbuminuria. Results: There were 341 patients (female, 58.9%; mean age, 55.3 ± 11.9 years) with a mean duration of DM of 9.4 ± 7.4 yearsand mean serum HbA1c of 8.4% ± 1.9%. The overall prevalence of any DR was 22.6% (95% confidence interval, 18.8–27.1)with prevalence rates of 4.1% (95% confidence interval, 2.1–6.4) for proliferative DR and 9.7% (95% confidence interval,6.8–13.2) for vision-threatening DR. Multivariate analysis showed that DR was significantly associated with certain age groups(reduced in older age groups), longer duration of DM (11 years or more), poor control (HbA1c >9.0%) and presence of any microalbuminuria. Conclusions: DR affects one in five patients with DM in Brunei Darussalam, comparable to rates reported for other Asianpopulations. It is especially worrying that one in ten patients with DM had vision-threatening DR. DR was significantly associatedwith longer duration of DM, poor control and presence of microalbuminuria but reduced in older age groups. It isimportant to advocate good control right from the time of diagnosis of DM and institute timely and effective management ofretinopathy. DR was significantly associated with longer duration of DM, poor control of diabetes, and presence of microalbuminuriabut reduced in older age groups.
Sajid Ali,Sang-Moon Lee,Choon-Man Jang 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The school building sector has a pivotal role to play in the transition to a low carbon economy. Due to COVID-19 pandemic, more efforts have been made to purify the air supplied indoors of school buildings which has raised the energy consumption of buildings and ventilation systems. Present work analyzes the energy performance of a school building with two classrooms. This building is under consideration for development of an energy-efficient heating, ventilation and air-conditioning (HVAC) system powered partially by renewable energy in the form of solar and geothermal energy. ‘Energy-balance method’ approach is used in present study to analyze building energy performance. The analyses showed that return air duct position has a significant impact on the energy efficiency of building and up to eight percent energy can be saved by choosing ceiling return rather than floor or wall return (for return air).
Sajid Qayyum,Tasawar Hayat,Sabir A. Shehzad,Ahmed Alsaedi 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
The main purpose of this article is to describe the magnetohydrodynamic stagnation point flow ofWalter-B nanofluid over a stretching sheet. The phenomena of heat and mass transfer are based on theinvolvement of thermal radiation and chemical reaction. Characteristics of Newtonian heating are givenspecial attention. The Brownian motion and thermophoresis models are introduced in the temperatureand concentration expressions. Appropriate variables are implemented for the transformation of partialdifferential frameworks into sets of ordinary differential equations. Plots for velocity, temperature, andnanoparticle concentration are displayed and analyzed for governing parameters. The skin friction coefficientand local Nusselt and Sherwood numbers are studied using numerical values. The temperatureand heat transfer rate are enhanced within the frame of the thermal conjugate parameter.
( Sajid Ullah Khan ),( Wang Yin Chai ),( Chai Soo See ),( Amjad Khan ) 한국정보처리학회 2016 Journal of information processing systems Vol.12 No.1
To resolve the problems of Poisson/impulse noise, blurriness, and sharpness in degraded X-ray images, a novel and efficient enhancement algorithm based on X-ray image fusion using a discrete wavelet transform is proposed in this paper. The proposed algorithm consists of two basics. First, it applies the techniques of boundary division to detect Poisson and impulse noise corrupted pixels and then uses the Wiener filter approach to restore those corrupted pixels. Second, it applies the sharpening technique to the same degraded X-ray image. Thus, it has two source X-ray images, which individually preserve the enhancement effects. The details and approximations of these sources X-ray images are fused via different fusion rules in the wavelet domain. The results of the experiment show that the proposed algorithm successfully combines the merits of the Wiener filter and sharpening and achieves a significant proficiency in the enhancement of degraded X-ray images exhibiting Poisson noise, blurriness, and edge details.