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Sama Venkatesh,Bommineni Madhava Reddy,B. Suresh,M.M.Swamy,Ramesh Mullangi 한국생약학회 2004 Natural Product Sciences Vol.10 No.1
Pharmacognostic studies on the shape, microscopic structure, and morphology of Rumex nepalensis (Polygonaceae) were carried out. These studies provided referential information for identification of this crude drug.
Precise Manufacturing and Performance Validation of Paper-Based Passive Microfluidic Micromixers
Mahdee Samae,Pawarit Ritmetee,Somyot Chirasatitsin,Sanja Kojić,Tijana Kojić,Jovana Jevremov,Goran Stojanović,Hani Al Salami 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.3
Micromixers are one of the most frequently used components in microfluidics. Passive micromixers are an emerging type with unique features in terms of reliability, robustness and efficiency. Hence, this study aimed to design, fabricate and test new multilayered passive micromixers consisting of three ad hoc layers, by means of a precise and cost-effective xurography manufacturing technique. The first and third layers are PVC foils, whereas the second layer is paper, incorporating microchannels of straight line or zig-zag configuration. Three different types of papers were analyzed as materials for the middle layer. Results demonstrated that immersing the papers into paraffin wax resulted in significantly improved physical characteristics, including solidification and intactness that reduced leakage of fluids into inside channels, thereby enhancing internal efficacy and delivery mechanisms. Subsequent assessments were carried out on mixing performance at various flow rates, pattern-related flow rates at various pressures and paper types, and results showed the impact of a zig-zag versus straight line configuration, demonstrating the importance of flow patterns on features of micromixers and their applications in microfluidic devices. Furthermore, image analysis was conducted to determine mixing efficiency of the proposed microfluidic micromixers.
The Unsettled Farmer Grazier Conflict in the Cameroon Grasslands
MOLEM Christopher Sama,Debora Johnson-Ross 숙명여자대학교 아시아여성연구원 2007 Asian Women Vol.23 No.4
This paper interrogates questions of power in the relationship between women farmers and male graziers in Wum, in the Menchum Division of the North West Province of Cameroon. In traditional African societies, men and women were engaged in different but complementary economic and social tasks all geared towards sustaining the family. The relative harmony that existed was destabilized with the introduction of cattle rearing during colonization. The predominantly female farmers used land that the graziers also sought for their herds. Because women’s rights to land were ensured only through a relationship with a male (father, husband, or brother), their ability to negotiate fair access to land became circumscribed as those who were the traditional custodians of the land became accustomed to the financial benefits gained by favoring graziers. To protest protracted Farmer-Grazier Conflicts (FGCs), the women periodically demonstrated and even once marched naked. Local and national officials have failed to adequately address the problem.
Hybrid approach for solving fuzzy fractional linear optimization problems
Jean de la Croix Sama,Kounhinir Some,Abdoulaye Compaore 원광대학교 기초자연과학연구소 2023 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.25 No.2
In this paper, a new method is proposed to solve fuzzy fractional linear problems with triangular fuzzy coefficients. It consists of a combination of two resolution approaches in order to deduce a more efficient hybrid method. Indeed, this hybridization combines Veeramani-Sumathi method and Dinckelbach's theorem. To solve fuzzy fractional linear problems, our new method proceeds in four stages. First, it transforms fuzzy fractional linear program into a deterministic fractional linear multiobjective program. Then, it transforms this second form into a linear mono-objective program. Thereafter, it solves the obtained last form of the problem by using the Danztig's simplex method. Finally, it uses the arithmetic fuzzy operations to bring back the obtained solution in the fuzzy set. For our new method, a theorem have been produced to highlight the justification of the theoretical mathematical foundations and two didactic examples are been solved to prove its numerical performances.
Mahmoud Reza Sohrabi,Sama Amiri,Hamid Reza Fard Masoumi,Mina Moghri 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Zero-valent iron nanoparticles were synthesized, for removal of Direct Yellow 12 dye. The experiments were designed by response surface methodology. Quadratic model was used to predict the variables. Analysis of variance was used for investigation of variables and interaction between them. High F-value (10.01), very low P-value (<0.0001), non-significant lack of fit, the determination coefficient (R2 = 0.903) and the adequate precision (10.82) demonstrate good correlation between experimental and predicted values of the response. The highest removal percent (90.02%) was attained, and the optimum parameters are achieved: catalyst amount (0.31 w/w%), initial concentration (40 mg/l), reaction time (105.35 s) and pH (5.23).
Hamid Amiri,Ehsan Daneshvar,Sama Azadi,Samira Azadi 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5
The cement industry is considered as a major source of heavy metals pollution in topsoil. This study aims at measuring the heavy metal contamination level in the vicinity of Shiraz cement factory, and assessing the ecological and environmental risks associated with the factory"s activities in the surrounding topsoil. To do so, 10 samples of soil were taken from around the Shiraz cement factory at the depth of 0-10 cm and the concentration of some heavy metals including Al, Cd, Ni, and Pb was measured. Enrichment factor (EF), geo-accumulation (Igeo), and pollution load (PLI) indices were used to assess the ecological risk of heavy metals.Based on the results, the mean concentration of Al, Ni, Cd, and Pb was 6,937.14, 88.09, 1.96, and 30.74 mg/kg, respectively. The EF results showed that due to anthropogenic activities, the Ni, Pb, and Cd element has moderate, severe, and very severe enrichment in the study area, respectively. The Igeo result for Al, Ni, Pb, and Cd was -0.82, -0.17, 0.16, and 0.68, respectively, which indicates non- to slightly pollution of these heavy metals in this region. The mean PLI in the study area was 1.4 indicating the low to medium pollution of heavy metal. The results of this study can be useful in determining and investigating the environmental effects of Shiraz cement factory.