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Effect of curing treatments on the material properties of hardened self-compacting concrete
Salhi, M.,Ghrici, M.,Li, A.,Bilir, T. Techno-Press 2017 Advances in concrete construction Vol.5 No.4
This paper presents a study of the properties and behavior of self-compacting concretes (SCC) in the hot climate. The effect of curing environment and the initial water curing period on the properties and behavior of SCC such as compressive strength, ultrasonic pulse velocity (UPV) and sorptivity of the SCC specimens were investigated. Three Water/Binder (W/B) ratios (0.32, 0.38 and 0.44) have been used to obtain three ranges of compressive strength. Five curing methods have been applied on the SCC by varying the duration and the conservation condition of SCC. The results obtained on the compressive strength show that the period of initial water curing of seven days followed by maturation in the hot climate is better in comparison with the four other curing methods. The coefficient of sorptivity is influenced by W/B ratio and the curing methods. It is also shown that the sorptivity coefficient of SCC specimens is very sensitive to the curing condition. The SCC specimens cured in water present a low coefficient of sorptivity regardless of the ratio W/B. Furthermore, the results show that there is a good correlation between ultrasonic pulse velocity and the compressive strength.
Effect of temperature on the behavior of self-compacting concretes and their durability
Salhi, M.,Li, A.,Ghrici, M.,Bliard, C. Techno-Press 2019 Advances in concrete construction Vol.7 No.4
The formulation of self-compacting concretes (SCC) and the study of their properties at the laboratory level were currently well mastered. The aim of this work is to characterize SCC under hot climatic conditions and their effects on the properties of fresh and hardened SCC. Particularly, the effect of the initial wet curing time on the mechanical behavior such as the compressive strength and the durability of the SCCs (acid and sulfate attack) as well as the microstructure of SCCs mixtures. In this study, we used two types of cement, Portland cement and slag cement, three water/binder (W/B) ratio (0.32, 0.38 and 0.44) and five curing modes. The obtained results shows that the compressive strength is strongly influenced by the curing methods, 7-days of curing in the water and then followed by a maturing in a hot climate was the optimal duration for the development of a better compressive strength, regardless of the type of binder and the W/B ratio.
( Siham Salhi ) 부산외국어대학교 북아프리카연구센터 2023 아프리카학 연구 Vol.3 No.1
Recently, the efforts of researchers and comparative religions specialists have focused on examining ways of humanism, peaceful coexistence, and religious dialogue. Such efforts motivate the looked-for dialogue and showing its dimensions and fields for the concerned parties. To achieve that, we need to the heritage books and references that roots the issues of religious debate, its cultural origins, and its theological ideas, as it focuses on highlighting the convergence and commonalities between religions. Undoubtedly, this authorial genre is rich of hundreds of manuscripts and books in different languages. Individual authors, who were the religious debaters, wrote these references, focusing on specific topics related to the sacred writings, religious rituals and their sacred symbols. This article aims to scholarly discuss “the Light of the Minds Guiding to Righteousness;” it is a manuscript that dates back to the 18<sup>th</sup> century and existed in the Faculty of Divinity in Turkey. This article also aims to get a closer understanding of the ethics of defensive debate in this period and the motives of religious people converting to another religion.
Abdelaziz Salhi,Salaheddine Sayouri,Lahoucine Hajji,TajEddine Lamcharfi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
Nanocrystalline barium titanate (BT) was synthesized by the sol gel method. The dry gel obtained was first treated in themicrowave (MW) and then calcined at different temperatures. A pure tetragonal phase was obtained under heat treatmentat 750 oC which is a relatively low temperature. SEM image reveals a fairly dense and uniform microstructure. Dielectricmeasurements performed on the sintered BaTiO3 sample at 1200 oC revealed the presence of the resonance phenomenon atfrequencies lower than 2 MHz and the existence of a weak positive temperature coefficient of resistivity (PTCR) just abovethe Curie temperature. Electric impedance analysis shows the predominance of the grain boundary (gb) contribution andenables determination of activation energies of the gb and the bulk effect and their relative capacitance and resistanceelements.
Mourad Salhi,Dounia Chaatouf,Benyounes Raillani,Nadia Dihmani,Samir Amraqui,M. A. Moussaoui,Ahmed Mezrhab,Jean Pierre Fontaine 대한설비공학회 2021 International Journal Of Air-Conditioning and Refr Vol.29 No.1
This work is a contribution to the improvement of the thermal and the dynamic fields of a natural convection indirect solar dryer, composed of a solar flat air heater and a drying chamber, intended for drying agricultural products and medicinal plants. We have studied the effects of size and position of the outlet on the distribution of air and temperature within the drying chamber, containing the figs as a product to be dried. To be more realistic, we have used a user defined function (UDF) subroutine written in C++ to integrate the unsteady evolution of a day’s climate data in the Oujda region.This study was achieved by numerical simulations using the ANSYS FLUENT software, in order to optimize the distribution of air and temperature inside the drying chamber, and to choose the best outlet’s position and size for the best efficiency of the dryer. The results show that the optimal outlet position found is in the right corner with a size range of 0.07 to 0.15 m. The effects of the position and size of the outlet on the air deflection along the trays were also presented and discussed.
Ennaifer, Emna,Salhi, Faten,Laassili, Thalja,Fehri, Emna,Alaya, Nissaf Ben,Guizani, Ikram,Boubaker, Samir Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: High risk human papillomaviruses (HPVs) are the leading cause of cervical cancer (CC) and Pap smear screening has not been successful in preventing CC in Tunisia. HPV vaccination that targets HPV16 and 18 offers a new efficient prevention tool. Identification of HPV types in CC is thus essential to determine the impact of HPV vaccine implementation. The aim of this study is to provide specific data from Tunisia. Materials and Methods: A total of 89 histological confirmed paraffin embedded samples isolated from patients with CC diagnosed between 2001 and 2011 were collected from five medical centres from Northern and Southern Tunisia. HPV DNA was detected using a nested PCR (MY09/MY11-GP5+/GP6+) and genotyping was assessed using a reverse blot line hybridisation assay that enables the detection of 32 HPV types. Results: HPV DNA was detected in all samples. Twelve high risk types were detected; HPV16 and/or 18 were predominant, accounting together for 92.1% of all the CC cases (HPV16: 83.1%). Single infections accounted for 48.8% of the cases and were mostly linked to HPV 16 (32.6%) and less frequently to HPV 18 (2.4%). The other high risk HPV single infections were linked to HPV 35 (4.6%), 45 (4.6%), 58 (2.3%) and 59 (2.3%). Multiple infections with mixing of 2 to 4 genotypes predominately featrued HPV16 and/or 18 with HPV 35 and 45 (96.6 %) and less frequently with HPV 59, 40, 66, 73 and 58. There was no statistically significant variation in the relative distribution of HPV types with age. Conclusions: These results strongly indicate that prophylactic HPV vaccines can have a major impact in preventing CC in Tunisia.
Farooq, Muhammad,Salhi, Abdellah Korean Mathematical Society 2011 대한수학회지 Vol.48 No.5
This paper is concerned with the solution of ill-conditioned Systems of Linear Equations (SLE's) via the solution of equivalent SLE's which are well-conditioned. A matrix is rst constructed from that of the given ill-conditioned system. Then, an adequate right-hand side is computed to make up the instance of an equivalent system. Formulae and algorithms for computing an instance of this equivalent SLE and solving it will be given and illustrated.