Modeling and Structure Optimization of Tapped Transformer

In this paper, a simplified circuit model of the tapped transformer structure has been presented to extract the Geometric and technology parameters and offer better physical understanding. Moreover, the structure of planar transformer has been optimized by using changing the width and space of the primary coil, so as to enlarge the quality factor Q and high coupling coefficient K. To verify the results obtained by using these models, we have compared them with the results obtained by employing the MATLAB simulator. Very good agreement has been recorded for the effective primary inductance value, whereas the effective primary quality factor value has shown a somewhat larger deviation than the inductance

The Performance of an Integrated Transformer in a DC/DC Converter

The separation between the low-voltage part and high-voltage part of the converter is formed by a transformer that transfers power while jamming the DC ring. The resonant mode power oscillator is utilized to allow elevated competence power transfer. The on-chip transformer is probable to have elevated value inductance, elevated quality factors and elevated coupling coefficient to decrease the loss in the oscillation. The performance of a transformer is extremely dependent on the structure, topology and other essential structures that create it compatible with the integrated circuits IC process such as patterned ground shield (PGS). Different types of transformers are modeled and simulated in MATLAB; the performances are compared to select the optimum design. The on-chip transformer model is simulated and the Results of MATLAB simulation are exposed, showing an excellent agreement in radio frequency RF

Mimo-ofdm pour les communications sans-fil dans les mines souterraines

Le travail dans les mines souterraines est hasardeux et risqué. D’ailleurs, l’humanité avait assisté à de nombreux incidents malheureux dans les mines où un grand nombre de personnes ont perdu leur vie. De ce fait, le renforcement de la sécurité dans les mines souterraines est devenu une nécessité. D’autre part, les communications sans-fil ont contribué à l’évolution de différentes industries de nos jours. En effet, elles ont permis de renforcer la sécurité et augmenter la production. Cependant, ce type de système est peu sollicité dans les mines. En fait, la majorité des communications souterraines est assurée par voie filaire. Comme les mines souterraines est un milieu, à la fois, dynamique et difficile d’accès, les communications sans-fil se manifestent comme une meilleure alternative aux systèmes filaires. Dans ce travail, nous avons présenté les caractéristiques du canal minier, du point de vue la propagation radio, pour des communications sans-fil à 2.4 GHz et 60 GHz. Ensuite nous avons fourni les résultats de l’évaluation des performances, de la technologie MIMO-OFDM, à travers ce canal minier. Par les différentes évaluations, nous avons mis en évidence la capacité de la configuration MIMO-OFDM à combattre la sélectivité fréquentielle et la dispersion temporelle causée par le canal minier. Nous avons démontré, de ce fait, que la technique MIMO-OFDM est une solution adéquate et prometteuse pour assurer des communications sans-fil fiables et à haut débit, dans les mines souterraines

Oligo- Element concentration of the Avocado ' Fuerte ' in Morocco - results leaf analysis

The fertilization operation of avocado trees must take into account the chemical composition of environmental soil and chemical elements of plant leaves. However, in Morocco, farmers don’t know well cultural techniques of avocado cultivation. Indeed most of them rely on the qualitative and quantitative fertilization applied to other types of trees. In this study, we assess the nutritional status of the Avocado variety called "fuerte" with some chemical elements. For this purpose we use leaf technical analysis to measure concentrations of these elements in avocado so that we can determine the quantity of every element needed by the tree. The results show that the different orchards studied did not suffer from the same deficits or excesses of the chemical elements studied. So, the application of this technique is so interesting for the culture of avocado and the respect for the environment. Keywords: Avocado, fertilization, leaf analysis, ‘Fuerte’ variety, Morocc

Pseudo-nitzschia Peragallo (Bacillariophyceae) diversity and domoic acid accumulation in tuberculate cockles and sweet clams in M’diq Bay, Morocco

The diversity of Pseudo-nitzschia (Bacillariophyceae) and accumulation of the neurotoxin domoic acid (DA) in two types of shellfish; tuberculate cockles (Acanthocardia tuberculata) and sweet clams (Challista chione) was explored in M’diq Bay,Morocco during 2007. The highest abundances of Pseudo-nitzschia were found during the period from March to October, with peaks occurring in May and September. Toxin analysis showed an accumulation of domoic acid in shellfish sampled during spring and autumn. The maximum toxin concentration was 4.9 mg DAg–1 of the whole tissue recorded in sweet clam during spring. Using transmission electron microscopy, thirteen Pseudo-nitzschia species were identified, eight of which are known as producers of domoic acid: P. multistriata, P. cuspidata, P. galaxiae, P. multiseries, P. pseudodelicatissima, P. pungens var. aveirensis, P. calliantha and P. fraudulenta. The five non- toxic species observed were P. subpacifica, P. arenysensis, P. dolorosa, P. subfraudulenta, and P. cf. caciantha

Current Status of Baricitinib as a Repurposed Therapy for COVID-19

The emergence of the COVID-19 pandemic has mandated the instant (re)search for potential drug candidates. In response to the unprecedented situation, it was recognized early that repurposing of available drugs in the market could timely save lives, by skipping the lengthy phases of preclinical and initial safety studies. BenevolentAI’s large knowledge graph repository of structured medical information suggested baricitinib, a Janus-associated kinase inhibitor, as a potential repurposed medicine with a dual mechanism; hindering SARS-CoV2 entry and combatting the cytokine storm; the leading cause of mortality in COVID-19. However, the recently-published Adaptive COVID-19 Treatment Trial-2 (ACTT-2) positioned baricitinib only in combination with remdesivir for treatment of a specific category of COVID-19 patients, whereas the drug is not recommended to be used alone except in clinical trials. The increased pace of data output in all life sciences fields has changed our understanding of data processing and manipulation. For the purpose of drug design, development, or repurposing, the integration of different disciplines of life sciences is highly recommended to achieve the ultimate benefit of using new technologies to mine BIG data, however, the final say remains to be concluded after the drug is used in clinical practice. This review demonstrates different bioinformatics, chemical, pharmacological, and clinical aspects of baricitinib to highlight the repurposing journey of the drug and evaluates its placement in the current guidelines for COVID-19 treatment

Assessment of serum, dietary zinc levels, and other risk factors during the third trimester among pregnant women with and without pregnancy-induced hypertension: a case-control study

BackgroundThis study assessed serum, dietary zinc levels, and other risk factors during the third trimester among pregnant women with and without pregnancy-induced hypertension (PIH).MethodsThis case-control study was conducted in 2022, in the three main Obstetrics and Gynecology departments in Gaza Strip, Palestine. One hundred sixty pregnant women, during the third trimester, aged ≥20 years, were selected using a convenient sampling method. Data were obtained using an interview-based questionnaire, food frequency questionnaire, anthropometric measures, and biochemical tests. Statistical analysis was performed using SPSS version 24.ResultsThe participants’ mean age was 30.7 ± 5.6 years. A total of 47 (58.8%) of cases and 6 (7.5%) of controls were insufficiently active; and the mean of blood pressure (mmHg) was 133.3 ± 11.9/85.11 ± 10.0 for cases and 112.8 ± 9.5/68.02 ± 7.2 for controls with significant differences between the two groups (P = <0.005). The mean serum zinc level (μg/dl) was 67.15 ± 16.5 for cases and 68.45 ± 18.0 for controls without significant differences between the two groups (P = 0.636). For newborns, the mean birth weight (g) was 2,904.6 ± 486 for cases, and 3,128.3 ± 501 for controls, and the mean Apgar score was 8.03 ± 0.62 for cases and 8.30 ± 1.17 for controls, with significant differences between the two groups (P = <0.005). Furthermore, 43 (53.8%) of cases have family history of hypertension; 5 (6.2%) were primiparous; 19 (23.8%) have previous caesarian section; 33 (41.2%) have history of preeclampsia; and 62 (77.5%) have edema, with significant differences between the two groups (P = <0.005). Additionally, the total zinc dietary daily intake (mg/day) was 4.15 ± 2.10 for cases and 4.88 ± 3.02 for controls, with significant differences between the two groups (P = 0.041). After adjustment for confounding variables, participants in the case group have higher odds of having low total zinc dietary intake compared to those in the control group [OR = 1.185, 95% CI = (1.016–1.382), P = 0.030].ConclusionThe current study showed the main risk factors of PIH among pregnant women in the Gaza Strip, Palestine. Furthermore, low maternal dietary zinc intake was associated with a high level of PIH. Moreover, having PIH could increase the risk of low birth weight and low Apgar scores. Therefore, reducing the main risk factors of PIH could reduce the adverse effect on both mother and birth outcomes

SCREENING OF SOME EGYPTIAN PLANT EXTRACTS FOR BIOLOGICAL ACTIVITY AGAINST SOME PATHOGENIC BACTERIA

Plants and plant by-products are now gaining attractiveness in treatment of bacterial infections and food preservation. The objective of this study was to assess antibacterial activity of some Egyptian plant and plant by-products against the locally pathogenic isolates from patients having infectious diseases in our country. Screening of antibacterial activity of ethanol, methanol and hexane extracts of some plants: grape leaves (Vitis vinifera), mulberry leaves (Morus alba), mallow leaves (Corchorus olitorius) and lemon leaves (Citrus limon) toward Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Salmonella sp., were investigated. Antibacterial activity was performed by the agar disc diffusion method. The ethanol and methanol extract of tested plant leaves showed promising antibacterial activities against both Gram-positive and Gram-negative tested bacterial isolates due to its great ability to extract those polyphenolic and biological active compounds from natural sources which effectively act against broad spectrum bacteria. Ethanol followed by methanol were found to be the best solvents of choice to extract natural products to get maximum health and medicinal benefits. The results revealed that the extraction efficiency increase with polarity increasing of the solvents, hence the highest extraction done with ethanol and methanol and the lowest extraction with nonpolar solvent n-hexanedid not exhibit any activity against all the tested bacteria. Irradiation at 5 and 10 kGy did not significantly affect the antibacterial activity of all tested plant leaves. Results indicate the potential of these plants for further work on isolation and characterization of the active compounds responsible for antibacterial activity and its exploitation as therapeutic agent

« The electromagnetic interference of mobile phones on the function of a gamma camera »

Purpose: The aim of the present study is to evaluate whether or not the electromagnetic field generated by mobile phones interferes with the function of a single-photon emission computed tomography (SPECT) gamma camera during data acquisition. Methods and materials: We tested the effects of seven models of mobile phones on one SPECT gamma camera. The mobile phones were tested when making a call, in ringing mode, and in standby mode. The gamma camera function was assessed during data acquisition from a planar source and a point source of technetium-99m with activities of 10 mCi and 3 mCi, respectively. A significant decrease in count number was considered to be electromagnetic interference (EMI). Results: The percentage of induced EMI with the gamma camera per mobile phone was in the range of 0–100%. The incidence of EMI was mainly observed in the first seconds of ringing and then mitigated in the following frames. Conclusion: Mobile phones are portable sources of electromagnetic radiation, and there is interference potential with the function of SPECT gamma cameras leading to adverse effects on the quality of the acquired images. Keywords: Electromagnetic interference (EMI), mobile phones, gamma camera, single-photon emission computed tomography (SPECT

Accumulation and Tissue Distribution of Domoic Acid in the Common Cuttlefish, Sépia Officinalis from the South Moroccan Coast.

Domoic acid (DA) is a phycotoxin produced by some diatoms, mainly from the Pseudo-nitzschia genus, and has been detected throughout the marine food web. In Morocco, many mollusc species are subject to regular monitoring of levels of contamination by toxins via Network Observation of the safety of the Moroccan coast (RSSL) implemented by National Fisheries Research Institute (INRH). Among these toxins, AD which has been frequently found in the bivalve molluscs, little known about DA accumulation  in cephalopod.This study presents the first data showing concentrations of DA that exceed health limits detected in the common cuttlefish, Sepia officinalis from the south Atlantic coast of Morocco.  Domoic acid was found throughout 2014 and 2015 in the digestive gland and flesh of cuttlefish reaching concentrations of 50 mg DA kg-1. The highest DA values  were  detected during autumn month. Evaluation of DA tissue distribution showed elevated DA concentrations in the digestive gland. The common cuttlefish, like other cephalopod species, plays a central position in the food web and might be a new DA vector to top predators like marine mammals.  Human intoxications are not expected as long as DA was only detected in the flesh at levels (16 mg DA kg-1) not exceed regulatory value. However, in some countries, whole juvenile animals are consumed (without evisceration), and in this case they might represent a risk to human health as the AD accumulation is more significant in the digestive gland than in the flesh. This study reveals a new member of the marine food web able to accumulate DA in Morocco