G-Shaped Antenna Mounted On USB Dongle Optimized For MIMO Applications Under WLAN 5.2/5.8/5.9

In this study, we used a G-shaped antenna due to its ease of integration into the overall design. The basic structure was adapted from a model proposed by W.-C. Liu. Then, we integrated it into a USB dongle, then added another antenna element to use it for MIMO applications in WLAN networks. A neutralization line is added between these two antenna elements to increase insulation

Alumina Membranes for Desalination and Water Treatment

In recent years, there has been a growing interest in utilizing inorganic membranes, particularly alumina (Al2O3) ceramic membranes (CMs), and to address a variety of separation problems in miscellaneous industry. Al2O3 membranes are commercially predominant in CMs market. Al2O3 material is generally used either as membrane support and/or as membrane layer due to advantages provided by this material and its derivatives such as availability in tonnage quantities, chemical inertness, good hardness, and thermal stability of the porous texture during elaboration steps. In this chapter, we comprehensibly look at the recent studies related to desalination and water treatment by ultrafiltration (UF), nanofiltration (NF) Al2O3 membrane, and highlight the separation properties of the membrane in specific environmental pollution. The influences of membrane operating conditions and water quality on the rejection of pollutant by Al2O3 membrane are reported through a series of bench-level experiments

EFFICIENCY OF ULTRAFILTRATION CERAMIC MEMBRANES FOR TOXIC ELEMENTS REMOVAL FROM WASTEWATERS

The preparation and characterization of porous ceramics multilayer ultrafiltration membrane is described. The first step consisted to prepare high-quality macroporous support in Moroccan clay. The choice of this material is based on its natural abundance and thermal stability.The microporous interlayer was then prepared by slip casting from zirconia commercial powders and finally the active UF toplayers was obtained by sol-gel route using ZnAl2O4 and TiO2 mixed sols. The performance of ultrafiltration membrane (TiO2 (50�20– ZnAl2O4 (50� was evaluated by pores diameter, water flux, thickness and molecular weight cut off (MWCO). The water permeability measured for this composite membrane is 9.42 L/(m2•h•bar), the thickness is less than 700 nm, the pore diameter is centered near 5 nm and the MWCO was about 4500 Da

PROCESSING AND CHARACTERIZATION OF TUBULAR CERAMIC SUPPORT FOR MICROFILTRATION MEMBRANE PREPARED FROM PYROPHYLLITE CLAY

Tubular macroporous support for ceramic microfiltration membranes were prepared by extrusion followed by sintering of the low cost pyrophyllite clay. Clay powders mixed with some organic additives can be extruded to form a porous tubular support. The average pore size of the membrane is observed to increase from 5 µm to 10.8 µm when sintering temperature increase from 900 °C to 1200 °C. However, with the increase in temperature from 900 °C to 1200 °C, the support porosity is reduced from 47% to 30% and flexural strength is increased from 4 MPa to 17 MPa. The fabricated macro-porous supports are expected to have potential applications in the pre-treatment and also can be used like support for membranes of ultra-filtration

Estudio de lesiones del edificio sede de la Sociedad Mexicana de Geografía y Estadística

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Very Thin Dielectric Resonator Antenna For Wireless Communications

In this paper, a very thin rectangular dielectric resonator antenna (Al2O3, εr = 9.8) is presented. A strip connected to a probe is used as feed mechanism. Moreover, at the dielectric resonator antenna back and top faces we have placed parasite strips to excite new resonances. The proposed antenna exhibit compact dimensions (0.9 x 8 x 7 mm3), very wide band (50.89%), good performances and a maximum gain of about 10.86 dBi. The dielectric resonator antenna performances is simulated on Ansoft HFSS and CST microwave studio

Pollution of Water Sources from Agricultural and Industrial Effluents: Special Attention to NO₃ˉ, Cr(VI), and Cu(II)

One of the most important challenges facing humanity today is to conserve and sustain water resources (either surface water or groundwater). This challenge became more pronounced with the increase of urban, agricultural, and industrial activities that discharge a considerable amount of wastewater. Therefore, the preservation of water sources from pollutants is a major concern, shared by all, public, industrial, scientific, researchers, and decision-makers. This chapter analyzes in more detail the pollution and pollutants caused by agricultural and industrial activities. Particular attention is given to pollution via nitrogen and heavy metals (NO3−, Cr(VI), and Cu(II)) in either international or national level. The effect of these pollutants on human health and environment, their standards/regulations, and the different current methods used for their detection and treatment are all discussed in the chapter

Experimentalism in the Postcolonial Moroccan Novel: Fusing the Spheres of Aesthetics and Politics

The phenomenon of al-tajrīb(experimentalism) seems to herald a new era of Moroccan literary history in the second half of the twentieth century. It has become almost synonymous with literary innovation, and is an invaluable tool that provides a window into contemporary Morocco. It is part of a larger transformational dynamic that affected Moroccan society in the decades following national independence in 1956. As a modernizing trend, al-tajrīb(experimentalism) can be construed as both a reaction to and a reflection of the transitional cultural landscape in the aftermath of decolonization and of Arab military-political defeats in the conflict with Israel, events that have left a mark on Moroccan and Arab consciousness. The year 1967 in particular emerges as extremely important, for it witnessed the historic defeat of Arab armies in the six-day war with Israel, which greatly impacted Moroccan and Arab literary activity. While it privileges questions of form, Moroccan experimental literature is not muted on challenges facing Moroccan society in the postcolonial era. The experimental novel surfaced in order to reconsider how questions of form relate to the political and the social. It provided an aesthetic space for voicing various types of critique of postcolonial Moroccan and Arab regimes. This paper seeks to highlight that the form-politics dialectic that informs Moroccan and Arab experimentalism is deeply tied to the notion of crisis, as it pertains to such terrains as politics, social justice, national culture, and identity