2,020 research outputs found
Solar Cell Parameters Extraction from a Current- Voltage Characteristic Using Genetic Algorithm
The determination of solar cell parameters is very important for the evaluation of the cell performance as well as to extract maximum possible output power from the cell. In this paper, we propose a computational based binary-coded genetic algorithm (GA) to extract the parameters (I0, Iph and n) for a single diode model of solar cell from its current-voltage (I-V) characteristic. The algorithm was implemented using LabVIEW as a programming tool and validated by applying it to the I-V curve synthesized from the literature using reported values. The values of parameters obtained by GA are in good agreement with those of the reported values for silicon and plastic solar cells. change to “After the validation of the program, it was used to extract parameters for an experimental I-V characteristic of 4 × 4 cm2 polycrystalline silicon solar cell measured under 900 W/m. The I-V characteristic obtained using GA shows excellent match with the experimental one.
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Ceramic Waste Powder as a Partial Substitute of Fly Ash for Geopolymer Concrete Cured at Ambient Temperature
The growth of the construction industry has expanded the demand for ceramic building products such as ceramic tiles, which constitute essential building materials. Nonetheless, a huge quantity of waste powder is produced during the polishing of ceramic tiles. The disposal of ceramic waste powder is a key environmental concern that needs to be properly addressed. The purpose of this research is to evaluate the potential of recycling ceramic waste powder as a geopolymer binder. The main objective consists of exploring the impacts of two types of ceramic waste powder (vitrified tiles and wall tiles) on the partial substitution of fly ash in geopolymer concrete. For this, concrete was prepared under ambient conditions without oven curing. Slump, compressive strength, split tensile strength, and modulus of elasticity tests were performed to measure the workability and the mechanical properties of the geopolymer concrete. Its durability was evaluated through water absorption and sorptivity tests. The microstructural behavior was investigated using scanning electron microscopy and X-ray diffraction measurements. The investigation revealed that a 15% partial replacement of fly ash by wall-tile ceramic waste powder in geopolymer concrete gave similar compressive strength, a 3% increase in tensile strength, and a 7% improvement in the modulus of elasticity. Partial replacement of fly ash with 15% vitrified ceramic waste powder reduced sorptivity and improved the microstructure of geopolymer concrete. The findings revealed that ceramic waste powder can be used to replace 10–15% of the fly ash in M35 grade structural geopolymer concrete, which can be cured under ambient conditions. Doi: 10.28991/CEJ-2022-08-07-05 Full Text: PD
Rodent Models for Metabolic Syndrome Research
Rodents are widely used to mimic human diseases to improve understanding of the causes and progression of disease symptoms and to test potential therapeutic interventions. Chronic diseases such as obesity, diabetes and hypertension, together known as the metabolic syndrome, are causing increasing morbidity and mortality. To control these diseases, research in rodent models that closely mimic the changes in humans is essential. This review will examine the adequacy of the many rodent models of metabolic syndrome to mimic the causes and progression of the disease in humans. The primary criterion will be whether a rodent model initiates all of the signs, especially obesity, diabetes, hypertension and dysfunction of the heart, blood vessels, liver and kidney, primarily by diet since these are the diet-induced signs in humans with metabolic syndrome. We conclude that the model that comes closest to fulfilling this criterion is the high carbohydrate, high fat-fed male rodent
DNA methylation in adipose tissue and metabolic syndrome
Epigenetics is the study of heritable phenotype changes that do not involve alterations in the DNA sequence with the processes including DNA methylation, histone modifications and RNA-associated silencing [1,2]. Castellano-Castillo and colleagues have analysed the impact of metabolic syndrome on the global DNA methylation pattern and the DNA methylation of several genes in visceral adipose tissue [3]. They concluded that DNA methylation in adipose tissue of these patients is related to the
aetiology of the syndrome. The role of DNA methylation in genes for adipogenesis, inflammation and lipid metabolism provides logical explanations for these changes in the development and progression of metabolic syndrome [3]
The high-pressure behavior of CaMoO4
We report a high-pressure study of tetragonal scheelite-type CaMoO4 up to 29
GPa. In order to characterize its high-pressure behavior, we have combined
Raman and optical-absorption measurements with density-functional theory
calculations. We have found evidence of a pressure-induced phase transition
near 15 GPa. Experiments and calculations agree in assigning the high-pressure
phase to a monoclinic fergusonite-type structure. The reported results are
consistent with previous powder x-ray-diffraction experiments, but are in
contradiction with the conclusions obtained from earlier Raman measurements,
which support the existence of more than one phase transition in the pressure
range covered by our studies. The observed scheelite-fergusonite transition
induces significant changes in the electronic band gap and phonon spectrum of
CaMoO4. We have determined the pressure evolution of the band gap for the low-
and high-pressure phases as well as the frequencies and pressure dependences of
the Raman-active and infrared-active modes. In addition, based upon
calculations of the phonon dispersion of the scheelite phase, carried out at a
pressure higher than the transition pressure, we propose a possible mechanism
for the reported phase transition. Furthermore, from the calculations we
determined the pressure dependence of the unit-cell parameters and atomic
positions of the different phases and their room-temperature equations of
state. These results are compared with previous experiments showing a very good
agreement. Finally, information on bond compressibility is reported and
correlated with the macroscopic compressibility of CaMoO4. The reported results
are of interest for the many technological applications of this oxide.Comment: 36 pages, 10 figures, 8 table
Gag Deadens but doesn't Mute the Crime: a Case Series of Homicidal Gagging
Background: Asphyxia is the commonest mode of death in various violent homicidal deaths and in majority of such cases, there may not be any evidence of external injury except the general features of asphyxia being the only proof to rely upon. Under such circumstances, even an experienced medicolegal expert may not go further than to declare the death to be due to asphyxia; the exact mode adopted being left unexplained.Case Report: We present here a case report of three family members who were killed by means of gagging with the motive of taking over the property.Conclusion: Deaths due to gagging is rare but most of the times homicidal. This case was peculiar as there were multiple individuals who were gagged simultaneously and their bodies were stuffed into trunk
Minoxidil poisoning presenting as acute coronary syndrome: a rare case scenario
We present a case of severe minoxidil poisoning (3000 mg) with resultant severe hypotension, tachycardia and subendocardial ischemia initially treated crystalloid, dopamine, aspirin, clopidogrel on the lines of acute coronary syndrome with partial haemodynamic improvement. After getting the history of minoxidil poisoning, the patient was treated with bolus doses of norepinephrine, and norepinephrine infusion, resulting in resolution of hypertension, tachycardia and reversal of ischemia. Topical minoxidil is commonly used agent for male pattern baldness. It also has got antihypertensive action when ingested, acute coronary syndrome and compensatory tachycardia with successful management with norepinephrine bolus and infusion
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