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Mesado C.,Miró R.,Verdú G. 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
This work covers an important point of the benchmark released by the expert group on Uncertainty Analysis in Modeling of Light Water Reactors. This ambitious benchmark aims to determine the uncertainty in light water reactors systems and processes in all stages of calculation, with emphasis on multiphysics (coupled) and multi-scale simulations. The Gesellschaft für Anlagen und Reaktorsicherheit methodology is used to propagate the thermal-hydraulic uncertainty of macroscopic parameters through TRACE5.0p3/PARCSv3.0 coupled code. The main innovative points achieved in this work are i) a new thermal-hydraulic model is developed with a highly-accurate 3D core discretization plus an iterative process is presented to adjust the 3D bypass flow, ii) a control rod insertion occurrence ewhich data is obtained from a real PWR teste is used as a transient simulation, iii) two approaches are used for the propagation process: maximum response where the uncertainty and sensitivity analysis is performed for the maximum absolute response and index dependent where the uncertainty and sensitivity analysis is performed at each time step, and iv) RESTING MATLAB code is developed to automate the model generation process and, then, propagate the thermal-hydraulic uncertainty. The input uncertainty information is found in related literature or, if not found, defined based on expert judgment. This paper, first, presents the Gesellschaft für Anlagen und Reaktorsicherheit methodology to propagate the uncertainty in thermalhydraulic macroscopic parameters and, then, shows the results when the methodology is applied to a PWR reactor
Synthesis of NiMn2O4 assisted by high-energy ball milling of NiO-MnO powders
Aguilar-Garib J. A.,Sánchez-de-Jesús F.,Bolarín-Miró A. M.,Ham-Hernández S. 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
This work presents a useful example of the fact that mechanical activation promotes solid state reaction in the preparation of a NiMn2O4 from NiO and MnO; shown evidence demonstrates that high-energy ball milling of MnO and NiO powders followed by a heat treatment can be considered a possible route for the synthesis of this compound. The powders were milled at room temperature in a shaker mixer in a weight ratio 1 : 10 of powder to zirconia balls. X-ray diffraction patterns show small differences among the powders milled for different times, while post milling heat treatments conducted at different temperatures for 1 hour showed an increase in the formation of the nickel spinel with a tetragonal structure, which was successfully obtained with this combined mechanosynthesis (MSP) - heat treatment method.
Diego Santos-García,Teresa de Deus Fonticoba,Carlos Cores Bartolomé,Maria J. Feal Painceiras,Maria J. Feal Painceiras,Cristina Martínez Miró,Silvia Jesús,Miquel Aguilar,Pau Pastor,Lluís Planellas,Mari 대한신경과학회 2023 Journal of Clinical Neurology Vol.19 No.4
Background and Purpose Visual hallucinations (VH) and subjective cognitive complaints (SCC) are associated with cognitive impairment (CI) in Parkinson’s disease. Our aims were to determine the association between VH and SCC and the risk of CI development in a cohort of patients with Parkinson’s disease and normal cognition (PD-NC). Methods Patients with PD-NC (total score of >80 on the Parkinson’s Disease Cognitive Rating Scale [PD-CRS]) recruited from the Spanish COPPADIS cohort from January 2016 to November 2017 were followed up after 2 years. Subjects with a score of ≥1 on domain 5 and item 13 of the Non-Motor Symptoms Scale at baseline (V0) were considered as “with SCC” and “with VH,” respectively. CI at the 2-year follow-up (plus or minus 1 month) (V2) was defined as a PD-CRS total score of <81. Results At V0 (n=376, 58.2% males, age 61.14±8.73 years [mean±SD]), the frequencies of VH and SCC were 13.6% and 62.2%, respectively. VH were more frequent in patients with SCC than in those without: 18.8% (44/234) vs 4.9% (7/142), p<0.0001. At V2, 15.2% (57/376) of the patients had developed CI. VH presenting at V0 was associated with a higher risk of CI at V2 (odds ratio [OR]=2.68, 95% confidence interval=1.05–6.83, p=0.039) after controlling for the effects of age, disease duration, education, medication, motor and nonmotor status, mood, and PD-CRS total score at V0. Although SCC were not associated with CI at V2, presenting both VH and SCC at V0 increased the probability of having CI at V2 (OR=3.71, 95% confidence interval= 1.36–10.17, p=0.011). Conclusions VH were associated with the development of SCC and CI at the 2-year follow-up in patients with PD-NC.
Pakistan’s Water Security Issue & Impacts of Floods
Mir Sher Baz Khetran(Mir Sher Baz Khetran ) 아시아사회과학학회 2023 Jornal of Asia Social Science Vol.10 No.1
Water security is a crucial issue for Pakistan due to its heavy dependence on agriculture and limited water resources. The country has been facing multiple challenges in managing its water resources, including population growth, climate change, and water pollution. Among these challenges, floods pose a significant threat to Pakistan's water security, as they not only cause significant damage to infrastructure but also have long-term impacts on water availability and quality. This paper examines the impacts of floods on Pakistan's water security and highlights the key factors that contribute to the country's vulnerability to flooding. The paper reviews the existing literature on Pakistan's water resources and flood management strategies and identifies gaps in knowledge and policy. It also analyzes the socioeconomic impacts of floods on the local communities and the wider economy, emphasizing the role of water security in achieving sustainable development.The findings of this study suggest that Pakistan needs to adopt a holistic approach to water management that takes into account the complex interplay of factors that affect water security. This approach should involve the development of sustainable water use practices, the promotion of water conservation, and the implementation of effective flood management strategies. The study concludes that addressing Pakistan's water security challenges requires a coordinated effort by the government, civil society, and private sector, and calls for the development of a national water policy that prioritizes water security and sustainability.
Mir, Arash Poorsattar Bejeh,Mir, Morvarid Poorsattar Bejeh Korean Academy of Oral and Maxillofacial Radiology 2012 Imaging Science in Dentistry Vol.42 No.3
Purpose: ANSI/ADA has established standards for adequate radiopacity. This study was aimed to assess the changes in radiopacity of composite resins according to various tube-target distances and exposure times. Materials and Methods: Five 1-mm thick samples of Filtek P60 and Clearfil composite resins were prepared and exposed with six tube-target distance/exposure time setups (i.e., 40 cm, 0.2 seconds; 30 cm, 0.2 seconds; 30 cm, 0.16 seconds, 30 cm, 0.12 seconds; 15 cm, 0.2 seconds; 15 cm, 0.12 seconds) performing at 70 kVp and 7 mA along with a 12-step aluminum stepwedge (1 mm incremental steps) using a PSP digital sensor. Thereafter, the radiopacities measured with Digora for Windows software 2.5 were converted to absorbencies (i.e., A=-log (1-G/255)), where A is the absorbency and G is the measured gray scale). Furthermore, the linear regression model of aluminum thickness and absorbency was developed and used to convert the radiopacity of dental materials to the equivalent aluminum thickness. In addition, all calculations were compared with those obtained from a modified 3-step stepwedge (i.e., using data for the 2nd, 5th, and 8th steps). Results: The radiopacities of the composite resins differed significantly with various setups (p<0.001) and between the materials (p<0.001). The best predicted model was obtained for the 30 cm 0.2 seconds setup ($R^2$=0.999). Data from the reduced modified stepwedge was remarkable and comparable with the 12-step stepwedge. Conclusion: Within the limits of the present study, our findings support that various setups might influence the radiopacity of dental materials on digital radiographs.
How does duration of curing affect the radiopacity of dental materials?
Bejeh Mir, Arash Poorsattar,Bejeh Mir, Morvarid Poorsattar Korean Academy of Oral and Maxillofacial Radiology 2012 Imaging Science in Dentistry Vol.42 No.2
Purpose : Clinicians commonly encounter cases in which it is difficult to determine whether adjacent radiopacities are normal or pathologic. The ideal radiopacity of composite resin is equal to or higher than that of the same thickness of aluminum. We aimed to investigate the possible effects of different curing times on the post-24-hour radiopacity of composite resins on digital radiographs. Materials and Methods : One mm thick samples of Filtek P60 and Clearfil resin composites were prepared and cured with three regimens of continuous 400 mW/$cm^2$ irradiance for 10, 20 and 30 seconds. Along with a 12-step aluminum step wedge, digital radiographs were captured and the radiopacities were transformed to the equivalent aluminum thicknesses. Data were compared by a general linear model and repeated-measures of ANOVA. Results : Overall, the calculated equivalent aluminum thicknesses of composite resins were increased significantly by doubling and tripling the curing times (F(2,8)=8.94, p=0.002). Notably, Bonferroni post-hoc tests confirmed that the radiopacity of the cured Filtek P60 was significantly higher at 30 seconds compared with 10 seconds (p=0.04). Although the higher radiopacity was observed by increasing the time, other comparisons showed no statistical significance (p>0.05). Conclusion : These results supported the hypothesis that the radiopacity of resin composites might be related to the duration of light curing. In addition to the current standards for radiopacity of digital images, defining a standard protocol for curing of dental materials should be considered, and it is suggested that they should be added to the current requirements for dental material.
New prospective approaches in controlling the insect infestation in stored grains
Ahmad Mir Shabir,Bashir Mir Mudasir,Ahmad Shah Manzoor,Mumtaz Hamdani Afshan,Valiyapeediyekkal Sunooj Kappat,Phimolsiripol Yuthana,Mousavi Khaneghah Amin 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
After harvest, food grains are kept in storage facilities for longer periods. Grain infestation during storage causes a significant loss in quality and market value. Various chemical methods have been implemented to control insect infestation in stored grains. However, the chemical fumigants for insects have been limited due to the resistance of insects, environmental concerns, and adverse effects on human health. Therefore, there is a need for viable alternatives for insect disinfestation, which can be residue-free and acceptable at the national and international markets. The new techniques used in the grain industry for insect control during storage gave promising results with high mortality. New methods, such as cold plasma, are becoming a safer tool for the disinfestation of stored grains. The new techniques are rapid and can be applied to bulk material without affecting the quality of grains.