Parameter estimation of electric power transformers using Coyote Optimization Algorithm with experimental verification

In this work, the Coyote Optimization Algorithm (COA) is implemented for estimating the parameters of single and three-phase power transformers. The estimation process is employed on the basis of the manufacturer's operation reports. The COA is assessed with the aid of the deviation between the actual and the estimated parameters as the main objective function. Further, the COA is compared with well-known optimization algorithms i.e. particle swarm and Jaya optimization algorithms. Moreover, experimental verifications are carried out on 4 kVA, 380/380 V, three-phase transformer and 1 kVA, 230/230 V, single-phase transformer. The obtained results prove the effectiveness and capability of the proposed COA. According to the obtained results, COA has the ability and stability to identify the accurate optimal parameters in case of both single phase and three phase transformers; thus accurate performance of the transformers is achieved. The estimated parameters using COA lead to the highest closeness to the experimental measured parameters that realizes the best agreements between the estimated parameters and the actual parameters compared with other optimization algorithms

Microfluidic actuation on lithium niobate and paper substrates using MHZ surface and bulk acoustic waves.

Surface acoustic waves are ~ 1 nm amplitude vibrations that can be generated on a piezoelectric material by applying an alternating current. Due to the relatively high frequency (MHz range), the generated surface vibration velocity is typically ~ 1 m/s with a tremendous acceleration of 107 m/s. For the last decade, SAW have found their way into a wide range of microfluidic applications, and a fascinating variety of fluid and micro-particle flow phenomena. However, the majority of these applications have been without a deep understanding of the governing physics in conjunction with a systematic experimental study; justifiably, due to the complexity of the interactions of these waves with fluids considering the high frequency used, (MHz range), compared to the natural resonance frequency of these fluids (Hz and KHz range). In this thesis, we demonstrate through experimental, theoretical, and limited numerical study how SAW interacts with microfluidic films and drops, and through the investigation we unravel two novel phenomena of unique fingering instability and soliton-like wave emergence and propagation, although the former — i.e. fingering instability — is akin in appearance to the classical viscous fingering instability, is distinct as the driving mechanism being the SAW diffraction. Beyond elucidating the underlying physics governing SAW-driven thin films, we designed an experimental setup comprising the integration of the SAW with microchannels patterned on a wet paper substrate, where a thin film at the paper’s tip was drawn out using SAW atomisation, which, led to driving the rest of the fluids at the channel’s other ends, leading to fluid mixing along the michrochannels. Mixing was quantified using a novel technique based on hue, which is shown to be more practical solution compared to the commonly known greyscale method, because of the latter’s lack of accuracy with limited colour contrast between fluids. Beyond the thorough experimental and theoretical understanding and integration with paper based microfluids, finally, for cost of effectiveness and simplicity of use we trade off SAW with a similar type of waves, in some aspects known as the Lamb waves to drive a range of microfluidic applications already achieved a SAW. The setup used here is exceptionally simple to the point that, in some cases, only standard aluminium foil is sufficient in simple contact with the lithium niobate substrate to good actuation. Large elastic deformations were achieved causing nebulisation of triggering a few mm mono-dispersed mist from a single microliter drop or a paper wick

Effects of contact resistance and metal additives in finned-tube adsorbent beds on the performance of silica gel/water adsorption chiller

Recently interest in adsorption cooling systems has increased due to their capability to utilise low grade heat sources and environmentally friendly refrigerants. Currently, most of the commercially available adsorption cooling systems utilise granular packed adsorbent beds. Enhancing the heat transfer process inside the adsorbent bed will improve the overall efficiency of the adsorption system. Using recently developed empirical lumped analytical simulation model for a 450 kW two-bed silica gel/water adsorption chiller, this paper theoretically investigates the effects of various adsorbent bed heat transfer enhancement techniques on the adsorption system cooling capacity. Firstly, coating the first adsorbent layer to the metal part and packing the rest of adsorbent granules to eliminate the thermal contact resistance between heat exchanger metal and granules while keeping the same level of permeability. Secondly, adding metal particles to the adsorbent in order to enhance the granules thermal conductivity. The effective thermal conductivity of adsorbent/metal mixtures were determined and validated by comparing it with published experimental data. Also, the combined effect of using both techniques simultaneously was investigated. All these investigations were carried out at various adsorption bed fin spacing. Results of the combined techniques showed that the enhancement in the cooling capacity and system coefficient of performance (COP) increased with increasing the fin spacing ratio to reach maximum of 25% and 10% respectively at fin spacing ratio of 2

Numerical Investigation of Copper Foam Adsorption Beds Packed with MOF-801 for Space Cooling and Desalination Applications

In this paper, an emerging Metal Organic Framework adsorbent MOF-801 packed into a recently developed copper foamed adsorbent-bed is numerically investigated under different operating conditions and physical parameters and benchmarked against the widely used silica gel adsorbent. A numerical model using lumped dynamic modelling approach was developed and validated against experimental data. An enhancement in the effective thermal conductivity for MOF-801 and silica gel foam packed bed and hence an improvement for the overall performance. The MOF-801-based system showed a higher performance for desalination application with a maximum production of specific daily water production of 13 m3/ton·day compared to 9 m3/ton·day for the silica gel-based system. MOF-801-based system evidenced its competition in the cooling application, achieving enhancement for the specific cooling power 140% higher than silica gel-based system

EVALUATION OF BACILLUS thuringiensis (BERLINER) FORMULATIONS AGAINST THE PINK BOLLWORM PECTINOPHORA gossypiella (SAUND.)

Laboratory experiments were carried out to investigate the effect of two bacterial commercial products of B. thuringiensis (Dipel 2x and Protecto) on eggs and the newly hatched larvae of pink bollworm, P.gossypiella. Different concentrations of both commercial products of B. thuringiensis were tested. The results showed that the percentage of larval mortality increased by increasing concentration and the period after treatment, calculated LC50s values after 3-7 days of treatment. Treatment of eggs did not affect, significantly, the hatchability. While the percentage mortality of newly hatched larvae produced from the treated eggs was high according to the concentrations used

IDENTIFICATION AND EFFICIENCY OF BACTERIAL STRAINS ISOLATED FROM INFECTED LARVAE OF COTTON PINK BOLLWORM Pectinophora gossypiella AND SPINY BOLLWORM Earias insulana (LEPIDOPTERA: NOCTUIDAE)

From infected pink and spiny bollworm larvae, collected from Qualyobia Gover-norate, Egypt, 13 bacterial isolates belonging to 7 species were detected. The effi-ciency of these bacterial isolates was evaluated on newly hatched pink and spiny bollworm larvae. Three bacterial species, namely, Pseudomonas viridiflava, Serratia grimesii and Cellulomonas flavigena had no efficiency. Meanwhile, four other en-tomopathogenic isolates bacterial species, Pseudomonas pyrrocinia (A1), Serratia marcesens (M3), Serratia rubidaea (E3) and Bacillus thuringiensis (S2) had notice-able efficiency. The efficiency of these isolates was compared to two commercial products, Dipel 2X and Protecto. Biochemical studies showed differences in total proteins bands patterns in uninfected and infected larvae

Multi-objective optimisation of MOF-801 adsorbent packed into copper foamed bed for cooling and water desalination systems

Recently, there have been several endeavours to enhance the performance of the adsorption systems for cooling cum desalination by developing new materials and adsorbent bed designs. Therefore, this article contributes to the field by computationally studying the utilisation of state-of-the-art MOF-801 adsorbent packed into the emerging copper-foamed adsorbent bed heat exchanger and benchmarking its performance against that utilising silica gel baseline adsorbent. A multi-objective global optimisation aimed simultaneously at the best coefficient of performance, specific cooling power, and clean water productivity was undertaken. The optimisation was built on the insights from a broad parametric study for the geometric and operating conditions. Given the novelty of the adsorbent MOF-801 and bed design combination, a one-dimensional model was developed to imitate the heat transfer in the adsorbent bed and coupled with a previously validated empirical lumped analytical model for the adsorption system using the MATLAB platform. Using copper foam significantly enhanced the effective thermal performance of the adsorbent bed, improving the overall system performance under different operating conditions. Furthermore, the clean water productivity of the MOF-801-based system outperformed that of the SG-based system by 38%, as the former yielded 29.7 m3/(ton.day), while the latter 21.5 m3/(ton.day). Besides, the MOF-801-based system showed specific cooling power of 830.8 W/kg compared to 611.5 W/kg for the silica gel-based system. However, the cooling capacity per unit volume determined the systems’ form factor, and the coefficient of performance was respectively higher by 9.6% and 20.2% for the silica gel-based system than those of the MOF-801-based system, stemming from the low packing density of MOF-801

Nonoscillatory solutions of discrete fractional order equations with positive and negative terms

summary:This paper aims at discussing asymptotic behaviour of nonoscillatory solutions of the forced fractional difference equations of the form \begin{align} \Delta ^{\gamma }u(\kappa )&+\Theta [\kappa +\gamma ,w(\kappa +\gamma )]\\=&\Phi (\kappa +\gamma )+\Upsilon (\kappa +\gamma )w^{\nu }(\kappa +\gamma ) +\Psi [\kappa +\gamma ,w(\kappa +\gamma )],\quad \kappa \in \mathbb {N}_{1-\gamma },\\ u_{0} =&c_{0}, \end{align} where $\mathbb {N}_{1-\gamma }=\{1-\gamma ,2-\gamma ,3-\gamma ,\cdots \}$, $0<\gamma \leq 1$, $\Delta ^{\gamma }$ is a Caputo-like fractional difference operator. Three cases are investigated by using some salient features of discrete fractional calculus and mathematical inequalities. Examples are presented to illustrate the validity of the theoretical results

An Artistic Vision of Using Polyurethane Foam in Drapping Fictional Costumes Designs to Achieve Sustainable Development

One of the aspects of the modern era is leaving more room for imagination and experimentation. Costumes design in general and fictional costumes design in particular are among the areas that need a lot of experimentation, especially with new, non-traditional materials. This is what encouraged the researchers to choose the polyurethane foam as a non-traditional material to design fictional costumes in order to achieve sustainable development goals. The research aims at clarifying the characteristics of the polyurethane foam and it’s Forming instead of plastic capabilities in the field of Costumes design, and providing proposals for fictional costumes designs with this material, in addition to achieving the sustainable development goals; such as, adopting sustainable production and consumption patterns, and stimulating innovation. The research findings state the possibility of achieving new visions of using the polyurethane foam to design and create fictional costumes in order to achieve the goals of sustainable development

Myomectomy for fibroids during cesarean section: A randomized controlled trial

Background: There is a considerable debate about the management of myoma during cesarean section (CS). Recently, several studies indicated the safety and feasibility of undertaking myomectomy during CS.Objectives: To evaluate the safety, accessibility, and short-term morbidity of myomectomy for fibroids during cesarean section.Patients and Methods: This was a randomized controlled trial that included 72 patients who were admitted to the Obstetrics &amp; Gynecology Department, Menoufia University Hospital with uterine fibroids during pregnancy; who were randomly allocated equally into a group of cesarean myomectomy (CM; n=36) and another group of CS only (n=36). The operative events and the outcome were recorded and analyzed.Results: CM group showed a longer duration of surgery and longer hospital stay, higher amount of blood loss, and higher mean pain sores, with a highly statistically significant difference (p = 0.000). No cases in both groups required blood transfusion or ICU admission. No statistically significant differences were noted between both groups as regards the fetal outcome measures (p=0.583 &amp; 0.601).Conclusion: CM is safe and applicable in selected cases without deleterious maternal complications. Special precautions ought to be paid during the procedure, particularly in the intramural type and with large fibroids