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Effect of shear stresses on the deflection and optimal configuration of a rectangular FGM structure
Ayoub El Amrani,Hafid Mataich,Jaouad El-Mekkaoui,Bouchta El Amrani Techno-Press 2023 Coupled systems mechanics Vol.12 No.4
This paper presents a static study of a rectangular functional graded material (FGM) plate, simply supported on its four edges, adopting a refined higher order theory that looks for, only,four unknowns,without taking into account any corrective factor of the deformation energy with the satisfaction of the zero shear stress conditions on the upper and lower faces of the plate. We will have determined the contribution of these stresses in the transverse deflection of the plate, as well as their effects on the axial stress within the interfaces between the layers(to avoid any problem of imperfections such as delamination) and on the top and bottom edges of the plate in order to take into account the fatigue phenomenon when choosing the distribution law of the properties used during the design of the plate. A numerical statement, in percentage, of the contribution of the shear effect is made in order to show the reliability of the adopted theory. We will also have demonstrated the need to add the shear effect when the aspect ratio is small or large. Code routines are programmed to obtain numerical results illustrating the validity of the model proposed in the theory compared to those available in the literature.
Protein Kinase and HDAC Inhibitors from the Endophytic Fungus <i>Epicoccum nigrum</i>
El Amrani, Mustapha,Lai, Daowan,Debbab, Abdessamad,Aly, Amal H.,Siems, Karsten,Seidel, Carole,Schnekenburger, Michael,Gaigneaux, Anthoula,Diederich, Marc,Feger, Daniel,Lin, Wenhan,Proksch, Peter American Chemical Society and American Society of 2014 Journal of natural products Vol.77 No.1
<P>A chemical investigation of the endophytic fungus <I>Epicoccum nigrum</I> isolated from leaves of <I>Mentha suaveolens</I> collected in Morocco resulted in the isolation of five new polyketides, epicocconigrones A and B (<B>1</B> and <B>2</B>), 3-methoxyepicoccone B (<B>3</B>), 3-methoxyepicoccone (<B>4</B>), and 2,3,4-trihydroxy-6-(methoxymethyl)-5-methylbenzaldehyde (<B>5</B>), together with five known compounds (<B>6</B>–<B>10</B>). The structures of the new compounds were unambiguously determined by extensive analysis of the 1D and 2D NMR and mass spectroscopic data. Compounds <B>1</B> and <B>10</B> showed potent inhibition of at least 15 protein kinases with IC<SUB>50</SUB> values ranging from 0.07 to 9.00 μM. Moreover, compounds <B>1</B> and <B>10</B> inhibited histone deacetylase (HDAC) activities with IC<SUB>50</SUB> values of 9.8 and 14.2 μM, respectively. A preliminary structure–activity relationship is discussed. Interestingly, compounds <B>1</B> and <B>10</B> exert mainly cytostatic effects in human lymphoma RAJI and U-937 cell lines.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2014/jnprdf.2014.77.issue-1/np4005745/production/images/medium/np-2013-005745_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np4005745'>ACS Electronic Supporting Info</A></P>
Investigation of rapid thermal oxide/ silicon nitride passivation stack of nþ emitter
A. El Amrani,R. Si Kaddour,M. Maoudj,A. El Kechai,S. Mezghiche 한국물리학회 2015 Current Applied Physics Vol.15 No.12
To anticipate the initial phosphorus diffusion parameters of silicon solar cells process fabrication, we report in this paper an overview of our experiments on silicon nþ-emitters passivation by means of rapid thermal silicon oxide/silicon nitride stack. The process-induced changes have been evaluated and explained.We found that 900 C and 80 s were the appropriate process parameters to grow 10 nm silicon oxide. Investigation of the effect of this oxidation on nþ multicrystalline silicon emitters revealed a large decrease (more than 25%) of the sheet resistance and around 12% increase of the junction depth. The experiments also revealed that the passivation effect of the optimal silicon oxide/silicon nitride stack is efficient only for higher emitter quality. In addition, we found that this stack reduces the surface reflection more than the optimal single silicon nitride layer.
Ethnobotanical survey of herbs used in the preservation of food products in Fez, Morocco
Ez zoubi Yassine,Lairini Sanae,El Amrani Soukaina,El-Akhal Fouad,Farah Abdellah,Bouslamti Rabia,El Ouali Lalami Abdelhakim 한국식품연구원 2022 Journal of Ethnic Foods Vol.9 No.-
Morocco has a rich plant biodiversity and an ancient ethnobotanical knowledge influenced by the ethnic diversity of the Moroccan population. This heritage has been preserved from generation to generation by traditional herbalists. In this study, data were collected via a survey of herbalists based on the direct interview technique. Questions addressed the herbalists’ age and education level as well as the vernacular names and parts of the plants used for the preservation of food. The species use value was used to identify the most important species recommended by herbalists. The average age of the participants was 52.55 years, and the illiteracy rate was 46%. A total of 32 plant species representing 16 families were identified as being used in the preservation of various food products. The most important family was Lamiaceae, followed by Apiaceae and Rosaceae. The most frequently used parts of the plant were the leaves (26.37%), followed by the fruit (24.7%), and the whole plant (12.7%). The highest use values were recorded for Citrus limon (0.16), Thymus vulgaris (0.14), Rosmarinus officinalis (0.12), Artemisia herba alba (0.11) and Lavandula dentata (0.1). Meat, vegetables and fish were the most commonly preserved food products. This ethnobotanical survey on the preservation of food products is the first of its kind conducted in Morocco and has implications for meeting consumer demands and understanding the potential uses of plants in the preservation of food products.
EXPLORING CUSTOMER EXPERIENCE WITH TABLETS IN M-COMMERCE: THE CASE OF WINE AND LUXURY BRANDS
PELET Jean-Eric,LECAT Benoît,El Amrani Redouane,Papadopoulou Panagiota 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06
Tablets and the omnipresent mobile environment create opportunities and challenges for m-commerce (mobile commerce) vendors, seeking to increase their profits. Understanding factors that affect that consumer behavior, positively and negatively, in tablets is essential for vendors in order to provide a fruitful m-commerce customer experience. The objective of this paper is to facilitate the understanding of consumers’ perceptions and behavior in m-commerce and social media on tablets and explore the potential of tablets for m-commerce purposes. The paper reports the findings of two exploratory research studies on wine and luxury goods. The first study examines consumer perceptions of the use of tablets and social media, in the context of m-commerce of wine. The second study relates to selling of luxury goods through the Internet. The results of our qualitative analysis show that user experience and design aspects, such as ease-of-use, are important factors for tablet adoption and use for m-commerce and social media. Adapting web content to tablets is, therefore, critical to enable effective m-commerce on this popular device. Business opportunities enabled by tablets and social media in m-commerce and how these can be leveraged in the wine and the wider luxury goods context are discussed.
A NOTE ON DISCRETE SEMIGROUPS OF BOUNDED LINEAR OPERATORS ON NON-ARCHIMEDEAN BANACH SPACES
Blali, Aziz,Amrani, Abdelkhalek El,Ettayb, Jawad Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.2
Let A ∈ B(X) be a spectral operator on a non-archimedean Banach space over an algebraically closed field. In this note, we give a necessary and sufficient condition on the resolvent of A so that the discrete semigroup consisting of powers of A is uniformly-bounded.
Recent Progress in Triple Negative Breast Cancer Research
Mouh, Fatima Zahra,El Mzibri, Mohammed,Slaoui, Meriem,Amrani, Mariam Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Triple-negative breast cancer (TNBC) is defined as a type of breast carcinoma that is negative for expression of oestrogene and progesterone hormone receptors (ER, PR) and HER2. This form of breast cancer is marked by its aggressiveness, low survival rate and lack of specific therapies. Recently, important molecular characteristics of TNBC have been highlighted and led to the identification of some biomarkers that could be used in diagnosis, as therapeutic targets or to assess the prognosis. In this review, we summarize recent progress in TNBC research focusing on the genetic and epigenetic alterations of TNBC and the potential use of these biomarkers in the targeted therapy for better management of TNBC.
Abdeljabbar Es-saghiri,Abdenabi Brahmi,Aumeur El Amrani 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
This paper reports the performance of a pentacene-based organic thin film transistor (OTFT) that was investigated using numerical simulations for different pentacene thicknesses. The studied OTFTs showed a peak mobility in the saturation region of 5 × 10^{-2}cm^2V^{-1}s^{-1} for a pentacene thickness of 50 nm. Furthermore, an optimum Ion/Ioff current ratio of 3.5 × 10^5 was observed for a similar pentacene thickness of about 50 nm. Moreover, the threshold voltage and the sub-threshold slope were significantly affected and decreased with increasing pentacene thickness. In addition, based on our proposed approach and the simulation results, we noticed that a penatcene thickness of 50 nm remained the optimum value for the active layer channel in order to obtain optimal performance from the OTFT devices.
Breast Cancer in Morocco: A Literature Review
Slaoui, Meriem,Razine, Rachid,Ibrahimi, Azeddine,Attaleb, Mohammed,El Mzibri, Mohammed,Amrani, Mariam Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
In Morocco, breast cancer is the most prevalent cancer in women and a major public health problem. Several Moroccan studies have focused on studying this disease, but more are needed, especially at the genetic and molecular levels. It is therefore interesting to establish the genetic and molecular profile of Moroccan patients with breast cancer. In this paper, we will highlight some pertinent hypotheses that may enhance breast cancer care in Moroccan patients. This review will give a precise description of breast cancer in Morocco and propose some new markers for detection and prediction of breast cancer prognosis.