Hybrid fuzzy sliding mode for stick-slip suppression in drill string systems حسب Krama, Abdelbasset

"…Stick-slip vibration is one of the main factors that contribute greatly to reducing the service life of drill string equipment and decreasing the efficiency of the overall drilling system. …"
احصل على النص الكامل
احصل على النص الكامل
احصل على النص الكامل

Concentrated Solar Power Plant for Key Locations in Doha Qatar حسب Elbeh, Mutaz Bargas

"…One of the pillars of the Qatar National Vision 2030 is the protection and preservation of the environment by decreasing the dependency on hydrocarbon resources and promoting the use and development of renewable energy sources. …"
احصل على النص الكامل

Cardiac Myosin Binding Protein-C in Sprague Dawley (SD) Rats exposed to Sub-Chronic oral dose of Cadmium Chloride حسب Al-Borshaid, Enjoud Khalifa

"…Male Sprague Dawley rats were subjected to a daily cadmium chloride dose (15ppm/Kg of body weight) for a period of 10 weeks. …"
احصل على النص الكامل
احصل على النص الكامل

Experimental results and modelling of corrosion-damaged concrete beams strengthened with externally-bonded composites حسب Elghazy M.

"…The investigated parameters included the corrosion levels (10 and 20% mass loss of steel reinforcement), the type of composite (fabric-reinforced cementitious matrix (FRCM) and fiber-reinforced polymers (FRP)), and the number of composite layers (one, two, and four). …"
احصل على النص الكامل
احصل على النص الكامل

Comparative Study on Gas-Sensing Properties of 2D (MoS2, WS2)/PANI Nanocomposites-Based Sensor حسب Parangusan, Hemalatha

"…The composite films also exhibited response and recovery times of 10/16 and 14/16 s. Therefore, the composite PANI/2D-TMDs is a suitable material for NH3 gas detection applications.…"
احصل على النص الكامل
احصل على النص الكامل
احصل على النص الكامل

Antimicrobial activity of amphiphilic nanomicelles loaded with curcumin against Pseudomonas aeruginosa alone and activated by blue laser light حسب Rupel, Katia

"…Among the three sublethal blue laser (λ 445 nm) protocols tested, the ones characterized by a fluence of 18 and 30 J/cm2 further decreased the antimicrobial concentration to 50 nM. …"
احصل على النص الكامل
احصل على النص الكامل

Thermal and mechanical properties of PP/HDPE/wood powder and MAPP/HDPE/wood powder polymer blend composites. حسب Dikobe, D.G.

"…Although the different components in the blends were immiscible, they showed one crystallization peak. MAPP and HDPE showed separate crystallization peaks in the composites, and this separation of the crystallization became more resolved with increasing WP content and at lower cooling rates. …"
احصل على النص الكامل
احصل على النص الكامل

Dynamic Caching for Files With Rapidly-Varying Features and Content حسب Amir, Mohamed

"…The developed scheme is presented for a network with one cache-enabled server, that has a pool of files, communicating with K cache-enabled receivers with requests limited to the server's file pool. …"
احصل على النص الكامل
احصل على النص الكامل

The Role of Key Impurity Elements on the Performance of Aluminium Electrolysis - Current Efficiency and Metal Quality حسب Al-Mejali, Jassim Ali

"…It is established in the literature that for every 100 ppm of phosphorus in the bath the current efficiency is decreased by 1%. The chemical and electrochemical behavior of phosphorus and silicon compounds in the Hall-Héroult process was studied. …"
احصل على النص الكامل

Long-term performance analysis and power prediction of PV technology in the State of Qatar حسب Touati F.

"…Besides, within one-month, a cloudy condition in Winter causes 20% drop in average output power. …"
احصل على النص الكامل
احصل على النص الكامل

Effect of pH on dissolution of iron sulfide scales using THPS حسب Ahmed, Musa

"…Both experimental and theoretical techniques suggest that the pyrite dissolution ability of THPS decreases as pH increases. Conversely, combing THPS with EDTA (Ethylenediaminetetraacetic acid) proved effective in dissolving a mixture of different iron sulfide field scales. …"
احصل على النص الكامل
احصل على النص الكامل

The effect of water table fluctuation and hydrogeochemical properties on NAPLs natural attenuation حسب Ismail, Reem Elfatih

"…Benzene and toluene concentrations decreased faster in fluctuating columns, resulting in a shorter lifespan for the source zone. …"
احصل على النص الكامل

Application of analytic hierarchy process (AHP) for sustainable pavement performance management in Qatar حسب Sirin, Okan

"…Purpose: Pavement is one of the main elements of the roads network. It is extremely essential to study and understand the factors affecting its performance and highlight the most important ones for decision-makers and pavement experts to consider during the design, construction and maintenance stages. …"
احصل على النص الكامل
احصل على النص الكامل

Portfolio Selection Problem Using CVaR Risk Measures Equipped with DEA, PSO, and ICA Algorithms حسب Hamdi, Abdelouahed

"…There are different metrics for the calculation of the risk factor, among which the most important one is the Conditional Value at Risk (CVaR). On the other hand, Data Envelopment Analysis (DEA) can be used to form the optimal portfolio and evaluate its efficiency. …"
احصل على النص الكامل
احصل على النص الكامل

Impacts of twenty years of experimental warming on soil carbon, nitrogen, moisture and soil mites across alpine/subarctic tundra communities حسب Alatalo, Juha M.

"…There was a significant site effect on the density of one mite species, Oppiella neerlandica, and all soil parameters. …"
احصل على النص الكامل
احصل على النص الكامل

Downlink Interference Analysis of UAV-Based mmWave Fronthaul for Small Cell Networks حسب Dabiri, Mohammad Taghi

"…Using numerical results show that the analytical and simulation results match one another. The results show that, in the presence of UAV's fluctuations, optimizing radiation pattern shape requires balancing an inherent tradeoff between increasing pattern gain to reduce the interference as well as to compensate large path loss at mmWave frequencies and decreasing it to alleviate the adverse effect of a UAV's vibrations.…"
احصل على النص الكامل
احصل على النص الكامل

Thermal behavior and post-heating fracture characteristics of polypropylene microfiber-reinforced geopolymer binders حسب Mohammad R., Irshidat

"…The fiber-reinforced specimens had higher residual compressive strength compared to the corresponding fibreless ones when heated up to 500 °C. The modulus of elasticity and the toughness of the binders decreased with heating. …"
احصل على النص الكامل
احصل على النص الكامل
احصل على النص الكامل

Effect of water absorption on the mechanical properties of long date palm leaf fiber reinforced epoxy composites حسب Mahdi, E.

"…The tensile/flexural results showed that water absorption decreased the specific ultimate strength and specific modulus by 14.8/14.5% and 40.1/17.8% respectively. …"
احصل على النص الكامل
احصل على النص الكامل
احصل على النص الكامل

Fluctuations in cardiac stroke volume during rowing حسب Sejersen, Casper

"…Also, SV fluctuated markedly during the stroke with deviations being largest at the higher work rate. Thus, SV decreased by 27 ± 10% (31 ± 11 mL) at the beginning of the stroke and increased by 25 ± 9% (28 ± 10 mL) in the recovery (P =.013), while breathing was entrained with one breath during the drive of the stroke and one prior to the next stroke. …"
احصل على النص الكامل
احصل على النص الكامل
احصل على النص الكامل

NUMERICAL INVESTIGATION OF THE POTENTIAL OF USING HYDROGEN AS AN ALTERNATIVE FUEL FOR AN INDUSTRIAL BURNER حسب QAZAK, ABDUL HAFIZ

"…An additional study was computed which is about varying the total MFR of air in a pure hydrogen study, and best case achieved that would improve the temperature profile is enhancing the MFR of excess air by 10%. …"
احصل على النص الكامل