Thanh Noi Phan  Martin Kappas  Khac Thoi Nguyen  Trong Phuong Tran  Quoc Vinh Tran  Ammar Rafiei Emam 《International journal of remote sensing》2019,40(14):5544-5562

Recently, the MODerate resolution Imaging Spectroradiometer (MODIS) land surface temperature (LST) is considered one of the most suitable ways to retrieve air surface temperature (T_a) – one of the most important and widely used climate variables for a wide range of applications. In fact, many successful studies have been reported in many regions of the world. Each day, four MODIS LST data are available; from two sensors (Terra and Aqua) at two local overpass times (daytime and night-time). However, due to their different overpass times, most studies have used LST daytime and night-time for daily maximum (T_max) and minimum (T_min) air surface temperature estimation, respectively. Therefore, the performance of each individual LST data, the effect of the dynamic combination of these four LST data, the effect of land surface characteristics, and the effect of LST quality on the same estimation in the same region on the accuracy of estimated T_a remains unclear. In this study, we evaluated and tested all individual LST data as well as all possible combinations of the four MODIS LST data from two separate stations with distinct land surface characteristics in northwest Vietnam for 10 years (from 2004 to 2013) under two sky conditions (all clear sky conditions and only good data – i.e. Quality Control (QC) value of 0) for daily T_a (T_max, T_min, and T_mean) estimations. In addition, the mixed data of the two stations were also evaluated. Our results showed that Terra LST data have a higher correlation with T_a than Aqua LST; which is consistent for both stations and both quality conditions (all clear sky and only good data). A closer overpass time with T_max or T_min occurrence time did not guarantee a higher accuracy of T_a estimation. Using only good LST data produced a higher accuracy of T_a estimation than using all clear sky data. However, if the percentage of good data is low (i.e. less than 30%), then the all clear sky data will provide better results for T_max estimation. Comparing the performance of the different combinations when using the single station and mixed station data, combinations including at least one night-time LST produced stable and high accuracy T_min and T_mean estimates, while the combinations with only daytime LST produced very low accuracy results. For T_max estimation, the results were less impacted by LST quality; however, they were strongly impacted by different combinations and land surface characteristics.  相似文献   

    

Hajer Khemaissia  Raja Jelassi  Chedliya Ghemari  Maryline Raimond  Catherine Souty‐Grosset  Karima Nasri‐Ammar 《Microscopy research and technique》2019,82(10):1819-1831

This study was conducted to compare metals bioaccumulation in the terrestrial isopod Armadillidium granulatum collected from Ghar El Melh lagoon. We focused on recognizing the effects of trace elements on hepatopancreas functional role. To this end, isopod specimens were exposed for 3 weeks to sediments contaminated with cadmium, copper, zinc, mercury, and nickel. Three concentrations were used in duplicate for each experimental condition. At the end of the experiment, metal body burdens were determined using flame atomic absorption spectrometry. Results of the bioaccumulation factor (BAF) showed that the species A. granulatum was classified as a Cu macroconcentrator (BAF > 2) and a Zn deconcentrator (BAF < 2). Dose dependent morphological and histological changes were observed in the hepatopancreas cells using transmission electron microscopy. The predominant features were: microvillus border disruption, condensation of the cytoplasm with increasing endoplasmic reticulum, mitochondria, lysosomes and granules that accumulated metals in B and S cells. The number of lipid droplets decreased especially after Cd, Zn, Hg, and Ni treatments. This study demonstrated that the terrestrial isopod A. gramulatum could be a good indicator of soil metal contamination.  相似文献   

    

Mohamed A. Farag  Naglaa M. Ammar  Abdel Nasser El Gendy  Engy Mohsen 《Journal of Food Processing and Preservation》2019,43(11):e14165

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Sahar M. Amin  Hossam M. Hassan  Abd El‐Nasser G. El Gendy  Ahmed A. El‐Beih  Tarik A. Mohamed  Abdelsamed I. Elshamy  Ammar Bader  Khaled A. Shams  Rabab Mohammed  Mohamed‐Elamir F. Hegazy 《Flavour and Fragrance Journal》2019,34(6):450-459

The chemical composition of essential oils (EOs) distilled from three wild Artemisia species, Artemisia herba‐alba, Artemisia judaica, and Artemisia monosperma, collected from Egypt, and Saudi Arabia, were analysed by gas chromatography–mass spectrometry (GC‐MS). The antibacterial activities of the EOs for all species were determined using the Agar disc diffusion method. The yield of the EOs ranged from 0.16 to 0.49%. The results showed that A. monosperma plants growing in Saudi Arabia gave the highest yield, compared with A. herba‐alba, A. judaica, and A. monosperma collected from Egypt. In total, 92 volatile compounds were identified from the aerial parts of the plants using GC‐MS. Oxygenated monoterpenes were the major class in A. herba‐alba (75.31%) and A. judaica (83.07%), whereas monoterpene hydrocarbons were the major representative group in A. monosperma collected from both Saudi Arabia (34.23%) and Egypt (36.23%). Yomogi alcohol (22.4%), artemesia alcohol (9.91%), and 1,8‐cineole (9.68%) were the major components of the EO of A. herba‐alba, whereas camphor (31.4%), piperitone (29.9%), and endo‐borneol (5.72%) were characterized as the main compounds in A. judaica. β‐Vinylnaphthalene (24.89%), β‐eudesmol (15.41%), and β‐pinene (20.67%) represented the main components of the EO of Saudi Arabian A. monosperma, but β‐pinene (11.89%), (–)‐spathulenol (8.84%), p‐cymene (8.83%), and shyobunone (7.05%) were the major components of the EO of Egyptian A. monosperma. Herein, a comparative analysis between the EOs of Egyptian Artemisia and those collected from Saudi Arabia was performed with principal components analysis (PCA) and agglomerative hierarchical clustering (AHC). The minimum inhibitory concentration (MIC) values ranged from 0.5 to2.5 μL per disc against different microorganisms. Artemisia judaica and A. monosperma (Saudi Arabia) plants had the highest MICs and A. monosperma (Egypt) had the lowest MIC, which may indicate different compositions as a result of climatic variation.  相似文献   

    

Noemen Ammar  Henri Baudrand 《International Journal of Circuit Theory and Applications》2019,47(8):1340-1356

This paper deals with an RLC circuit network with triangular or hexagonal grid. It is about a planar equilateral triangular grid where the passive (resistor, capacitor, and inductor) or active (voltage source for example) components are located at the sides or/and at nodes attached to the ground. The planar graph is oriented by three main direction vectors phase shifted to 60° degrees. The wave concept iterative process (WCIP) method was employed to the theoretical formulation of the problem. In the formulation, the potential difference across each circuit component is represented by an auxiliary source defined in the spectral domain. The proposed theory is developed into two definition domains: a spectral domain in which periodicity and coupling between the circuit components are defined and a spatial domain describing the network topology and imposing the continuities conditions (Kirchhoff laws). The transition between the spectral and spatial domain is ensured by the so-called fast hexagonal Fourier transform. Numerical applications demonstrate the ability of the method for solving the inhomogeneous triangular lattices. Various conceptions have been proposed including an RL, RC, and RLC triangular network circuit, a perturbed triangular RLC circuit, and a triangular circuit excited by many lumped sources.  相似文献   

    

Meriam Tir  Imen El Cafsi  Rym B. Ammar  Hssan Mejri  Nizar Tlili  Mhamed El Cafsi 《Lipids》2019,54(2-3):163-176

The aim of the present work was to study the effect of season on phospholipids and triacylglycerols (TAG) of mantle and tentacles of female and male wild Sepia officinalis. The identified phospholipids were phosphatidylethanolamine (PtdEtn), phosphatidylcholine (PtdCho), phosphatidylserine (PtdSer), and phosphatidylinositol (PtdIns), and PtdEtn was the major fraction. Results showed apparent seasonal variation of phospholipid content, particularly with female samples. Fatty acid composition of phospholipid classes showed a differentiation much more in the proportions than in the diversity of fatty acids. Results showed that the major saturated fatty acids were 16:0 and 18:0, the major monounsaturated fatty acids were 18:1 and 20:l, and the major polyunsaturated fatty acids were docosahexaenoic acid (22:6n-3) (DHA) and eicosapentaenoic acid (20:5n-3) (EPA). The results relative to TAG demonstrated significant variations. Principal component analysis confirmed the seasonal and sexual effects. This study could be appropriate for the improvement of consistent monitoring of phospholipid and TAG accumulation in cephalopod, which might be important for both physiological studies and food industries.  相似文献   

    

Ahlam Ammar Sharif 《建筑学研究前沿（英文版）》2023,12(3):496-508

New walking studies have been concerned with the multiplicity of pedestrian experiences. Some consider walking as an activity that unfolds as part of social life, allowing people to create relationships with others, where multiple walking types can be identified depending on these relations. Some contributions, inspired by actor-network theory (ANT), suggest understanding this activity through a networked perspective that associates human and non-human actors, with a focus on their various and dynamic relations between them. The focus on stabilized networks, which emphasizes the recurrence of these relations, helps in identifying and extending themultiplicity of walking activity experience and emerging types. Despite this potential, ANT contributions are still limited. This paper aims to present the ANT potential in unpacking the multiplicity of the walking activity. It utilizes the case of Dahiyat Al Hussain park in Jordan and applies an ANT-inspired ethnographic approach to unpackwalking. It uses desk research, in-depth interviews, go-along interviews, and observations to engage with participants’ views and experiences. By tracing the recurring relational patterns, the paper identifies three instances when walking practice can be considered as stabilized during network shaping, transformation, and interrelations. These stabilizations provide a nuanced perspective into the multiplicity of walking practices.  相似文献   

    

Faouzi Sakouhi  Ammar Chérif  Chaima Saadi  Sadok Boukhchina 《European Journal of Lipid Science and Technology》2023,125(12):2300013

Bioactive compounds are components extracted from biological matrices that may offer physiological health benefits and have nutritive value. The present study characterized bioactive lipid components such as fatty acids, phytosterols, policosanol, and triterpenes from table olives. The table olives were processed according to the green Spanish-style method. The obtained results indicate that phytosterol fraction constitutes the major portion of the total unsaponifiable matter. The analysis of phytosterols showed the presence of 11 compounds, β-sitosterol the predominant one. The policosanol composition indicated that hexacosanol, tetracosanol, octacosanol, and docosanol were the main compounds, accounting for over 85% of total policosanols. Pentacyclic triterpenes (cycloartenol and 24-methylene cycloartenol) were found at a higher level (over 85%) compared to tetracyclic triterpenes (β-amyrin, δ-amyrin). These findings reveal that processed table olives contain an interesting amount of various bioactive compounds compared to marine and other floral biological matrices. Thus, processed table olives represent an interesting natural functional food that presents high stability and bioavailability of their natural bioactive ingredients. Practical Applications: Nowadays, with health food gaining popularity among consumers, the demand for natural bioactive compounds and functional food is expanding considerably all over the world. This study focuses on analyzing bioactive lipid components from processed table olives. Fruits were processed according to the green Spanish-style method. The salt content of the brine was adjusted to the minimum sodium chloride value required by the Codex Alimentarius Comission, which is 5%, taking into consideration people suffering from hypertension. This concentration is considered the minimum amount of salt necessary to exhibit antibacterial activities. Considering the results obtained, processed table olives present one of the most valuable potential resources for bioactive lipid compounds and have a considerable ability to preserve the stability of their lipid components. Thus, the food industry in Mediterranean countries can promote processed table olives as conventional functional food with no need for any enrichment or fortification.  相似文献   

    

Noomene Sleimi  Rim Kouki  Maryem Hadj Ammar  Renata Ferreira  Rosa Pérez-Clemente 《Food Science & Nutrition》2021,9(4):2086-2094

Barium (Ba) is a nonessential element that can cause several deleterious effects in most organisms. Elevated Ba concentrations can be toxic for plants and may affect growth and disturbances in homeostasis. This study aimed to evaluate the Ba stress, the plant-tolerance limits, and the detoxification strategy adopted by Cucumis sativus L. The effect of Ba on seed's germination and vegetative development of this species was evaluated. For germination test, different Ba concentrations were used (0, 200, 500, 1,000, and 2,000 μM). Results showed that germination was stimulated with 500 and 2,000 µM of Ba. The toxicity effect on plant development was studied by treating the plants with increasing doses of Ba (100, 200, 300, and 500 μM) during 45 days. Shoot and root dry biomass production decreased significantly with elevated Ba concentrations, although water content enhanced in the roots. The concentration of Ba, 500 µM, induced high Ba accumulation in shoots and roots (9 times higher than in the control plants). Moreover, results showed that catalase, guaiacol peroxidase, and ascorbate peroxidase activities were stimulated in the different tissues of cucumber plants which highlight the occurring of an oxidative damage through Ba treatments and the involvement of the plant enzymatic antioxidant defense system.  相似文献   

    

Zeghdoud Sabrina;Tanougast Camel;Teguig Djamal;Mesloub Ammar;Sadoudi Said;Bouteghrine Belqassim; 《International Journal of Communication Systems》2024,37(16):e5907

New cognitive radio (CR) systems require high throughput and bandwidth. Hence, CR users need to detect wide frequency bands of the radio spectrum to exploit unused frequency channels. This paper proposes a new wideband spectrum sensing (WBSS) detection approach based on machine learning (ML) for scanning subchannels. The originality of the proposed approach is to detect spectrum opportunities using a narrowband spectrum sensing (NBSS) method-based support vector machine (SVM) classification and two features: energy and goodness of fit (GoF). The simulation results show that the proposed WBSS approach-based ML presents a higher probability of detection than the WBSS approach-based conventional detectors, even at low signal-to-noise ratio (SNR). Finally, the software defined radio (SDR) implementation validates the proposed WBSS approach for real detection scenarios.  相似文献