http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Rachedi, (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Khouiled Rachedi,Abdel Illah Nabil Korti 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.4
One of the discussed techniques in improving the performance of latent thermal energy storage applications is to use different phase change materials (PCMs) encapsulated in spherical nodules. However, the large number of spheres used in the storage applications pushes the researchers to neglecting the natural convection effect inside spheres. Consequently, they cannot observe the real thermal interaction effect between spheres. The objective of this work is to carry out a computational study on the thermal behavior of two adjacent different PCMs inside aluminum spherical capsules and taking into account the natural convection effect inside the spheres. Water is used as heat transfer fluid (HTF) at constant inlet temperature. The study shows that for the HTF inlet velocity lower than 10 −5m/s, the thermal interaction between two adjacent different PCMs cannot be neglected. However, the thermal interaction appears more clearly in the discharging mode. The thermal interaction can accelerate the discharging of one of the PCMs by reducing the discharging of the other one
-
Nasreddine Lahouasnia,Mohamed Faouzi Rachedi,Djalel Drici,Salah Saad 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
Although the asynchronous machine is renowned for its qualities of robustness, reliability, low cost of construction and efciency, it happens nevertheless that faulty operations may appear during its lifetime. Numerous papers have studied the mechanical defects detection in electric motors using stator currents. The present paper is focused on the detection of load unbalance in three-phase induction motor relying on stator currents analysis. The proposed approach is based on the analysis of current space vector transformation, which takes in consideration all the information provided by the induction machine, this information is analysed by the means of Power Spectral Density and the Wavelet Packet Decomposition techniques. For this purpose, an experimental setup is designed to conduct experimental tests and show the advantages of space vector transformation compared to single-phase analysis. The obtained results are discussed and analysed.
-
Boundary conditions effect for buckling analysis of porous functionally graded nanobeam
Bouhadra, Abdelhakim,Menasria, Abderrahmane,Rachedi, Mohamed Ali Techno-Press 2021 Advances in nano research Vol.10 No.4
This paper is concerned with the buckling behavior of 2D and quasi-3D problem of functionally graded nanobeam founded on high order shear deformation beams theory and made by two different types of porous distribution materials in Nano- and micro-scales. The used Quasi-3D formulation takes into account the transverse shear effect and uses only three variables. Both formulations do not include the correction factor that is required in the first shear deformation theory proposed by Timoshenko. Governing equations are derived using the principle of virtual work. Analytical resolutions for buckling of FG nanobeam are introduced under tow different boundary conditions, and the results obtained are compared to those proposed in literatures.
-
Differentiated Thyroid Carcinoma Risk Factors in French Polynesia
Xhaard, Constance,Ren, Yan,Clero, Enora,Maillard, Stephane,Brindel, Pauline,Rachedi, Frederique,Boissin, Jean-Louis,Sebbag, Joseph,Shan, Larrys,Bost-Bezeaud, Frederique,Petitdidier, Patrick,Drozdovitc Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6
Background: To investigate differentiated thyroid cancer risk factors in natives of French Polynesia is of interest because of the very high incidence of this cancer in the archipelago. Materials and Methods: To assess the role of various potential risk factors of thyroid cancer in the natives of French Polynesia we performed a case-control study. The study included almost all the French Polynesians diagnosed with differentiated thyroid carcinoma between 1981 and 2003 (n=229) and 373 French Polynesian control individuals from the general population without cancer. Results: Thyroid radiation dose received from nuclear fallout before the age of 15, a personal history of neck or/and head medical irradiation, obesity, tallness, large number of children, an artificial menopause, a familial history of thyroid cancer, a low dietary iodine intake, and having a spring as the main source of drinking water were found to be significant risk factors. No roles of smoking habits, alcohol consumption, iodine containing drugs, and exposure to pesticides were evidenced. Conclusions: Except for smoking, differentiated thyroid carcinoma risk factors in natives of French Polynesia are similar to those in other populations. Our finding on the role of having a spring as a drinking water origin is coherent with some other studies and could be due to geological factors.
-
Ren, Yan,Kitahara, Cari Meinhold,de Gonzalez, Amy Berrington,Clero, Enora,Brindel, Pauline,Maillard, Stephane,Cote, Suzanne,Dewailly, Eric,Rachedi, Frederique,Boissin, Jean-Louis,Sebbag, Joseph,Shan, Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.13
Background: Numerous studies have suggested that selenium deficiency may be associated with an increased risk for several types of cancer, but few have focused on thyroid cancer. Materials and Methods: We examined the association between post-diagnostic fingernail selenium levels and differentiated thyroid cancer risk in a French Polynesian matched case-control study. Conditional logistic regression models were used to estimate odds ratios and 95% confidence intervals. Results: The median selenium concentration among controls was $0.76{\mu}g/g$. Significantly, we found no association between fingernail selenium levels and thyroid cancer risk after conditioning on year of birth and sex and additionally adjusting for date of birth (highest versus lowest quartile: odds-ratio=1.12, 95% confidence interval: 0.66-1.90; p-trend=0.30). After additional adjustment for other covariates, this association remained non-significant (p-trend=0.60). When restricting the analysis to thyroid cancer of 10 mm or more, selenium in nails was non-significantly positively linked to thyroid cancer risk (p-trend=0.09). Although no significant interaction was evidenced between iodine in nails and selenium in nails effect (p=0.70), a non-significant (p-trend =0.10) positive association between selenium and thyroid cancer risk was seen in patients with less than 3 ppm of iodine in nails. The highest fingernail selenium concentration in French Polynesia was in the Marquises Islands ($M=0.87{\mu}g/g$) and in the Tuamotu-Gambier Archipelago ($M=0.86{\mu}g/g$). Conclusions: Our results do not support, among individuals with sufficient levels of selenium, that greater long-term exposure to selenium may reduce thyroid cancer risk. Because these findings are based on post-diagnostic measures, studies with prediagnostic selenium are needed for corroboration.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
