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GAS-COOLED FAST REACTORS_DHR SYSTEMS, PRELIMINARY DESIGN AND THERMAL- HYDRAULIC STUDIES
Malo, J.Y.,Bassi, C.,Cadiou, T.,Blanc, M.,Messie, A.,Tosello, A.,Dumaz, P. Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.2
The Gas-cooled Fast Reactor (GFR) is one of the six reactor concepts selected within the framework of the Generation IV initiative and is the reference concept for the Commissariat $\grave{a}$ l'Energie Atomique $(CEA^1)$. Two reactor unit sizes have been considered: 600 MWth and 2400 MWth. As far as thermal-hydraulics is concerned, reactor decay heat removal (DHR) proves to be a major issue. The CEA has conducted exploratory design studies to address this issue and a reference solution for the 600MWth reactor has been recommended.
Sévilor KEKEUNOU,Stephen WEISE,Jean MESSI 한국곤충학회 2010 Entomological Research Vol.40 No.1
Zonocerus variegatus (Orthoptera: Pyrgomorphidae) is known as an agricultural pest in West and Central Africa. In this study, the effects of 13 single and eight mixed host plant diets on the survival, post-embryonic development and morphology of Z. variegatus in the laboratory were investigated. In each cage, 20 one-day larvae were provided with these diets and their survival monitored every two days, from August 2000 to September 2002, until all individuals died. Results showed that the number of larval stages varied from six to eight according to the diet. Six larval stages were most frequent. Development to the adult stage (complete development) was only noted with 52% of diets. All the mixed host plant diets induced complete development of Z. variegatus except that of Cajanus cajan + Synedrella nodiflora + Chromolaena odorata. Complete development was observed with four single host plant diets: Lablab purpurea, C. cajan, Manihot esculenta and S. nodiflora. Compared to leguminous species and Asteraceae, M. esculenta (Euphorbiaceae) was the species that resulted in the highest level of survival and development of Z. variegatus. Chromolaena odorata and S. nodiflora (Asteraceae) induced late appearance of the different Z. variegatus nymphal instars and the appearance time was shorter on legumes. The supernumerary stage 7 has the same color as the larva in stages 1–6, but this larva was significantly larger than stage 6 and smaller than the adult stage. These results indicate that legumes for short fallows affected the survival and post-embryonic development of Z. variegatus in the laboratory.
Comparative Evaluation of Periodontal Alteration in Pregnant Women in Relation to Foetal Sex
Jules Julien Ndjoh,Metogo Ntsama Junie Annick,Onana Messi Marie,Zilefac Brian Ngokwe,Sandra Lydie Akena Ndeng,René Ngoulma,Lawrence Essama Eno Belinga,Vicky Ama Moor 대한예방치과학회 2023 International Journal of Clinical Preventive Denti Vol.19 No.1
Objective: Periodontal disease is an inflammatory condition with a diverse aetiology that affects the gums and tooth supporting structures and, if untreated, can lead to tooth loss, dental implant loss and a reduced quality of life and self-confidence. Recent research has found that pregnant women with male foetuses experience more inflammation than those with female foetuses. Furthermore, periodontal disease has been linked to poor birth outcomes, emphasizing the significance of this research. Determine the extent of periodontal change in pregnant women in relation to foetal sex. Methods: We conducted an analytical cross-sectional study from January 10th to May 30th 2022, recruiting participants from the YCH, the FMBS's laboratory of dental implantology and periodontology, and analysing samples at the YUTH Biochemistry laboratory. The sera samples were then used to analyse hormones (Testosterone and Progesterone) using the ELISA competitive and sandwich methods. Results: The average age was 30 years old, and the average gestational age was 31 weeks. In both groups, we found a 58% prevalence of PD, with 30% of the 58% being in women carrying male foetuses. Testosterone levels were higher in women carrying male foetuses than in women carrying female foetuses. Between people with periodontal disease and those who did not, there was a moderately strong relationship (r=0.552) and a statistically significant difference (p=0.042) in testosterone levels. Conclusion: Pregnancy increases the risk of periodontal disease. During pregnancy, the sex hormone progesterone had no significant association with the development of periodontal disease. Finally, women carrying male foetuses had a higher prevalence of periodontal disease than women carrying female foetuses.