Yanbu Journal of Engineering and Science (YJES)
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202 research outputs found
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PARTICLE SWARM OPTIMIZATION OF A FINITE CONVERGENCE CONTROL FOR DC-DC CONVERTERS
No full textDC-DC converters are widely used as power electronics devices. Many control methods were developed for DC-DC converters control mostly with asymptotic convergence. Sliding mode control is a proven robust control approach and will be used to achieve finite time convergence. Furthermore a particle swarm optimization (PSO) algorithm will be used to optimize controller parameters which used an ITAE criterion. The simulation of terminal sliding mode control of a DC-DC converter is carried out for different operating conditions and its results will be compared to classic sliding mode control results, we will show the validity of terminal sliding mode control approach
Solid-Phase Extraction and GC/MS Confirmation of Heroin Abuse in Urine
No full textA method for the analysis of urine for the heroin abuse is described. The analytical procedure uses solid-phase extraction (SPE), gas chromatography/mass spectrometry (GC/MS). It allows extraction, derivatization and analysis of 6-MAM and Morphine from urine. After solid-phase extraction was complete, the eluate was selectively derivatized with N-Methyltrimethylsilyltrifluoroacetamide (MSTFA). Analysis was performed using a GC/MS system operating in full scan mode. The mass spectrum of the derivatized metabolites was searched manually against reference libraries for positive identification and the retention time checked against that of the standard. This procedure has increased both the amount and the reliability of information given to analyst. The system has been in routine operation processing 100-150 urine samples per week. The results of the analysis of standard reference material and actual samples are presented and discussed. The developed method is sensitive enough to assess relevant 6-MAM and morphine levels in urine for forensic investigations
ECONOMICAL AND TECHNICAL ASSESSMENTS OF GRID CONNECTED SOLAR PV POWER GENERATION SYSTEM IN SAUDI ARABIA
No full textRecently, electricity cogeneration and regulatory authority (ECRA) announced the approval of small-scale solar PV system regulation for solar grid connected systems in the distribution system. As a result, this research paper will focus on testing the effect of using utility interactive solar system in reducing electricity consumption from the utility grid. Also, the environmental effects such as temperature and solar irradiance on the performance of the solar system will be analyzed. A 3 kW grid tie solar system for a residential building has been designed and simulated. The system has been investigated from technical prospective in terms of soiling and temperature effect on the system energy production. Also, the economic impacts from saving energy that is imported from the grid have been outlined. These studies focused on the system parameters such as voltage and current during different weather conditions. Throughout this research, the small-scale solar PV system regulation for solar grid connected systems in Saudi Arabia has been described. Finally, different article of National Electric Code for solar grid-tie system for residential buildings have been addressed
SYNTHESIS, CHARACTERIZATION AND ANTIBACTERIAL ACTIVITY OF NEW BRIDGED AND MACROCYCLIC SCHIFF BASES
No full textIn this work we focused on the synthesis of new Open Schiff bases were prepared by condensation of salicylaldehyde with both 4,4\u27-diaminodiphenyl methane, 4,4\u27-diamino diphenyl sulphide, and condensation of O-vanilin with diethyl ester of terephthalic acid respectively, and also were prepared New Macrocyclic Schiff Bases by condensation of 1,6-dibromohexane with thiocarbohydrazid. The Schiff base were checked by different spectral techniques (LC-MS, \u27H-NMR, IR). The Schiff bases have been screened for their antibacterial activity, where compound (II) showed promising results against gram positive and gram negative bacteria
DEFORMED ENERGY LEVELS OF A PSEUDOHARMONIC POTENTIAL: NONRELATIVISTIC QUANTUM MECHANICS
No full textThe paper described the exact solutions of Schrödinger equation for diatomic molecules with pseudoharmonic potential (r) = D(-), it was solved by applying the Boopp\u27s shift method to first order in the non-commutativity parameter and standard perturbation theory, the bound state energy (eigen values) found to be degenerate. It\u27s shown that the noncommutative Hamiltonian (NC) described automatically a particle with spin (1/2) interacted with an external magnetic field, including the usual Zeeman effect in commutative space. Furthermore, I observed the NC Hamiltonian can be described automatically the spin-orbit interaction, I justified my results by calculate the absolute incertitude
WASHABILITY STUDY OF FOUR PAKISTANI COALS BY FLOAT AND SINK TECHNIQUE-II
No full textVarious Pakistani coal samples were separated into float and sink fractions using media of different specific gravities. The various float and sink fractions as well as the whole coal samples were ashed at 750 °C in a muffle furnace and the ashes were analyzed for Co. Cu, Ni, and Zn by atomic absorption spectrophotometer. The results showed that less enrichment of these metals occurred in the sink fraction in media of different specific gravities in case of Makarwal and Sor-Range coals. However, in case of Degari and Shahrigh coals considerable enrichment of these metals occurred in the sink fractions. The results were explained by suggesting that in case of Makarwal and Sor-Range coal samples, considerable amounts of these trace metals might occur in close association with the organic structure of coal which are difficult to be removed by the specific gravity method of coal cleaning. In case of Degari and Shahrigh coals, however considerable amounts of these metals might occur as discrete minerals matter which can be separated with ease from coal by the specific gravity method of cleaning
OPTIMUM PERCENTAGE OF VOLCANIC TUFF IN CONCRETE PRODUCTION
No full textThe Tafila area (Jabal Al Hala) is covered with volcanic tuff, which has been tested and studied for its possible use as a construction material in the production of ordinary concrete. The volcanic tuff material was used at 10, 20, 30, 40, and 50% mix proportion of the materials in the concrete mix. It was subsequently tested for density, compressive strength, and flexural strength. The density of volcanic concrete (VC) ranged from 2195 to 2297 kg/m³. At 20% of volcanic tuff or volcanic aggregate (VA), the density of VC was 2285 kg/m3 and 2310 kg/m³, the compressive strength was 17 MPa and 21 MPa, flexural strength was 5 MPa at the 7th and 28th days, respectively. The results showed that the volcanic tuff can be used in concrete production by replacing part of the aggregate (fine and coarse) by the VA, with the proportion of 20% of VA as the optimal value. The VA can be used for VC production where lower density is required for loading, and the VC shows a remarkable density and strength during the testing and construction at sites
Meme Generation Using Deep Neural Network to Engage Viewers on Social Media
No full textIn today’s technological era, most new generations are using memes because the phenomenon of memes is rapidly gaining in popularity. In addition, various modifications and parodies use social and cultural phenomena to transform an original idea into another. Virus memes are sometimes called virus scripts and are the most widespread on the Internet. However, there is little scientific evidence for this assumption. This paper presents an innovative method to generate memes using machine learning algorithms that match the users’ humorous and relevant captions. The VGG16 network is used to return the embedded image. We have collected feedback from citizens of more than five countries and received 37 feedbacks to find humorous memes. The obtained results from feedback are very encouraging from the generated memes
MANUFACTURING AND CHARACTERIZATION OF ACTIVATED CARBON FROM BIOSOLIDS FOR TREATMENT OF WASTE WATER
No full textThis paper deals with the manufacturing of activated carbon from locally available agricultural waste, namely dates stones (DS) to be used as cheap adsorbent for wastewater treatment. The manufacturing process includes the use of zinc chloride, phosphoric acid and sulfuric acid as chemical activators. The temperature and time of activation were varied to produce activated carbons with different properties. The adsorption of methylene blue (MB) on the produced activated carbon was investigated. The date stones, charcoal and the activated carbon samples were characterized using Fourier Transform Infrared spectroscopy and scanning electron microscope techniques. The results indicated that all the produced activated carbons have good adsorptivity towards methylene blue. The phosphoric acid was found to be the best activator when combined with carbonization temperature of 400 °C for one hour. All the prepared samples were found to have micro pores with that prepared using sulfuric acid to irregular compared to the other two types. The surface of the prepared samples was found to contain many functional groups was C-O to be predominant
Optimal Evaluation of Photovoltaic Cells Parameters Using Euclidean Distance Calculations
No full textThe relationship between current and voltage describes the features and characteristics of the photovoltaic (PV) cells. This relationship mainly depends on the equivalent circuit parameters of the PV cell model. Accurate estimation of these parameters is crucial for analyzing the performance of PV systems. This paper proposes a simple and efficient method to estimate the equivalent circuit parameters of the PV cells/modules. The main concept of the proposed method is to optimize the PV series resistance value using Euclidean distance calculations in such a way to get the corresponding best maximum power conditions. Various assessments have been employed in this paper to confirm the validity of the presented approach. Those include analyzing different commercial PV modules, experimental data, irradiance and temperature variations, and comparison with other reported algorithms. When compared with experimental data at standard test conditions, the mean absolute current and power differences are 0.0329 A and 0.6339 W, respectively. Furthermore, the mean absolute differences at normal operating cell temperature are 0.0120 A and 0.1412 W. The results have shown that the proposed method has confirmed its effectiveness in predicting the PV cell equivalent circuit characteristics for any PV cells/modules using only data available from the manufacturer’s datasheet