Selective harmonic elimination in awide modulation range using modified Newton-raphson and pattern generation methods for a multilevel inverter

Considering the aim of having low switching losses, especially in medium-voltage and high-power converters, the pre-programmed pulse width modulation technique is very useful because the generated harmonic content can be known in advance and optimized. Among the different low switching frequency techniques, the Selective Harmonics Elimination (SHE) modulation method is most suitable because of its direct control over the harmonic spectrum. This paper proposes a method for obtaining multiple solutions for selectively eliminating specific harmonics in a wide range of modulation indices by using modified Newton-Raphson (NR) and pattern generation techniques. The different pattern generation and synthesis approach provide more degrees of freedom and a way to operate the converter in a wide range of modulation. The modified Newton-Raphson technique is not complex and ensures fast convergence on a solution. Moreover, multiple solutions are obtained by keeping a very small increase in the modulation index. In the previous methods, solutions were not obtainable at all modulation indices. In this paper, only exact solutions to the low-order harmonics elimination for Cascaded H-bridge inverter are reported for all modulation indices. Analytical and simulation results prove the robustness and correctness of the technique proposed in this paper. 2018 by the authors.Acknowledgments: This (publication, report, etc.) was made possible by NPRP grant # [X-033-2-007] from the Qatar National Research Fund (a member of Qatar Foundation).Scopu

Human Gait Recognition Subject to Different Covariate Factors in a Multi-View Environment

Human gait recognition system identifies individuals based on their biometric traits. A human’s biometric features can be grouped into physiologic or behavioral traits. Biometric traits, such as the face [1], ears [2], iris [3], finger prints, passwords, and tokens, require highly accurate recognition and a well-controlled human interaction to be effective. In contrast, behavioral traits such as voice, signature, and gait do not require any human interaction and can be collected in a hidden and non-invasive mode with a camera system at a low resolution. In comparison with other physiological traits, one of the main advantages of gait analysis is the collection of data from a certain distance. However, gait is less powerful than physiological traits, yet it still has widespread application in surveillance for unfavorable situations. From traditional algorithms to deep learning models, a gait survey provides a detailed history of gait recognition

Identification of leaf rust resistant gene Lr10 in Pakistani wheat germplasm

Leaf (brown) rust is the major disease of wheat in Pakistan and other countries. The disease is more effectively controlled when several rust resistance genes are pyramided into a single line. Molecular survey was conducted to screen 25 Pakistan wheat germplasm for the presence of leaf rust resistance gene Lr10 using specific STS primer. The survey revealed that out of the 25 germplasm/lines grown in Hazara University Botanic garden, 18 genotypes were observed with Lr10 gene, while seven genotypes did not show the presence of Lr10 gene. The identification of Lr10 in Pakistan wheat germplasm will help in accelerating the breeding program in future, including the pyramiding of different resistant genes in wheat varieties.Key words: Wheat, leaf rust, Lr10, molecular markers

Response of Chickpea Lines to Ascochyta rabiei at Two Growing Stages

During winter 2004 and 2005, two field and glasshouse experiments were conducted to evaluate the response of 471 chickpea genotypes to Ascochyta rabiei, as Ascochyta blight (AB) disease in Chickpea (Cicer aurietimum). Frequent rainfall at flowering and pod formation stages made favorite conditions conducive for the infection and symptoms expression. So, the genotypes with high level of tolerance at seedling stage proved response to the pathogen under field condition. Disease at seedling and adult plant stage exhibited high association, although level of infection was higher at adult plant stage. In glasshouse 65 genotypes at seedling stage and in field experiment 14 genotypes at pod formation stage were resistant to the pathogen. Following green house and field screening methods, six genotypes FLIP98-229C, FLIP82-150C,NCS 950204, NCS 950219, NCS 9903 and PaidarxParbat from NARC and six lines (FLIP 00-20C, FLIP 02-18C, FLIP 02-44C, FLIP 97-120C, FLIP 02-39C and FLIP 97-102C) from ICARDA found resistant for multilocational / agronomic evaluation and use as resistant parent trials for high yielding AB resistance breeding varieties

Effects of mannan-oligosaccharides’ supplementation on hatching characteristics of four close-bred flocks of Japanese quail breeders

The present study was conducted to evaluate the effects of mannan-oligosaccharides’ (MOS) supplementation on hatching characteristics of four close-bred flocks (CBFs) of Japanese quail (Coturnix coturnix japonica) breeders. A total of 960 Japanese quail breeders, aged 12 weeks old, were randomly selected and divided into four groups (n = 240) with twelve replicates (n = 20) in a completely randomized design (15 ♂ : 5 ♀). The birds were a fed corn-based basal diet (group D) or basal diet supplemented with MOS at the levels of 0.25 % (group A), 0.5 % (group B) and 1.0 % (group C) for 15 weeks. The collected data were analyzed by two-way ANOVA techniques using Statistical Analysis System. The fertility and hatchability of 0.50 % MOS-supplemented group was significantly higher than other treatment groups. Similarly, fertility and hatchability percent of fertile eggs of Kaleem flock was significantly higher than other flocks, while dead in-shells were significantly lower in Sadat flock. Conclusively, MOS supplementation positively influences the fertility and hatchability of quail breeders.Keywords: Fertility, hatchability, Japanese quail breeders, mannan-oligosaccharides, poultry biotechnolog

Minimization of total harmonic distortions of cascaded H-bridge multilevel inverter by utilizing bio inspired AI algorithm

Minimizing total harmonic distortion (THD) with less system complexity and computation time is a stringent constraint for many power systems. The multilevel inverter can have low THD when switching angles are selected at the fundamental frequency. For low-order harmonic minimization, selective harmonic elimination (SHE) is the most adopted and proficient technique but it involves the non-linear transcendental equations which are very difficult to solve analytically and numerically. This paper proposes a genetic algorithm (GA)-based optimization technique to minimize the THD of cascaded H-bridge multilevel inverter. The GA is the finest approach for solving such complex equations by obtaining optimized switching angles. The switching angles are calculated by the genetic algorithm by solving the nonlinear transcendental equations. This paper has modeled and simulated a five-level inverter in MATLAB Simulink. The THD comparison is carried out between step modulation method and optimization method. The results reveal that THD has been reduced from 17.88 to 16.74% while third and fifth harmonics have been reduced from 3.24%, 3.7% to 0.84% and 3.3%, respectively. The optimization method along with LC filter significantly improves the power quality providing a complete sinusoidal signal for varying load

PILOW (Power Innovation Let’s Zero Waste) Berbasis Biopower Sebagai Alternatif Mengatasi Krisis Energi

The energy crisis that has occurred globally is also experienced by the people of Huntu Selatan Village, Bone Bolang Regency. Some people in the village are experiencing a crisis in electricity and the supply of liquefied petroleum gas (LPG) for daily life. This service activity aims to help the people of South Huntu Village overcome this problem by processing waste into alternative energy sources through the PILOW (Power Innovation Lets Zero Waste) Program with the concept of zero waste go-green energy and a back-to-back system, using biodigester tank technology . Activities use participatory methods in the form of workshops, through stages: preparation, implementation, practice and testing of tools, evaluation, and mentoring. Through this program, the people of Huntu Selatan Village who are members of the Karang Taruna group are able to process waste into an alternative energy source which has the opportunity to overcome the electricity crisis and LPG supply for daily life. This program is continued through assistance and collaboration with the Go-Green Gorontalo community

Relation of Particle Size with Toxicity of Calcite Particles

The importance of certain types of nanomaterials and mineral nanoparticles, namely clays and the smallest mineral colloids, has been known for a long time. Mineral nanoparticles also behave differently than larger micro and macroscopic crystals of the same mineral. The variations in chemical properties are most likely due to differences in surface and near surface atomic structure, as well as crystal shape and surface topography as a function of size in this smallest of size regimes. Although most of the nanotoxicological studies were performed using unrealistic exposure conditions. Knowledge about potential human and environmental exposure combined with dose response, toxicity information will be necessary to determine real or perceived risks of nanomaterials following inhalation, oral or dermal routes of exposure. Because the respiratory tract is the major portal of entry for airborne nanoparticles, this exposure route can be used as an example to discuss some key concepts of nanotoxicology, including the significance of dose, dose rate, dose metric and biokinetics

Comparison of 2D and 3D Co-Culture with Hanging Drop Method to Produce a More Clinically Relevant Microenvironment

2-dimensional (2D) co-cultures show limited resemblence with in vivo microenvironment while 3-dimensional (3D) co-cultures form a micromass which is more similar with in vivo microenvironmentthus it would be more useful in biomedical research. This study was intended to compare 2D co-cultures with 3D co-cultures of stem cells derived from umbilical cord blood vessels and hepatic stellate cells, conducted with hanging drop method to assess the cell morphology and the formation of spheroid from the micromass.. This in vitrostudy was conducted at Institute of Human Virology and Cancer Pathobiology (IHVCB) UI and histology laboratory from September 2015 to October  2016 using stem cells which were isolated from human umbilical cord blood (UCB) and LX-2 cell line (human hepatic stelate cells). Human umbilical cord blood was sorted with MACS CD34 and percentage of CD34+ cells were analyzed by flowcytometry. Stem cell co-cultures (UCB) or umbilical cord and L2 was did by hanging drop methods for 2D co-culture and  3D co-culture. Triplicates experiments were performed for each set of co-culture. The results showed the difference in the morphology of 2D co-culture and 3D hanging drop compared to monoculture. In the 2D co-culture there was a micromass formation, whereas    in the 2D monoculture, the micromass was not formed. In the 3D hanging drop there was a smaller spheroid compared to the 3D hanging drop monoculture. The morphology of 2D and 3D co-culture cells with hanging drop method in comparison with monoculture cells showed phenotypic changes of cells which were incorporated together in the micromass