Simultaneous optimal integration of photovoltaic distributed generation and battery energy storage system in active distribution network using chaotic grey wolf optimization

Goal. The integration of photovoltaic distributed generations in the active distribution network has raised quickly due to their importance in delivering clean energy, hence, participating in solving various problems as climate change and pollution. Adding the battery energy storage systems would be considered as one of the best choices in giving solutions to the mentioned issues due to its characteristics of quick charging and discharging, managing the quality of power, and fulfilling the peak of energy demand. The novelty of the proposed work is the development of new multi-objective functions based on the sum of the three technical parameters of total active power loss, total voltage deviation, and total operation time of the overcurrent protection relay. Purpose. This paper is dedicated for solving the allocation problem of hybrid photovoltaic distributed generation and battery energy storage systems integration in the standard IEEE 33-bus and IEEE 69-bus active distribution networks. Methodology. The optimal integration of the hybrid systems is formulated as minimizing the proposed multi-objective functions by applying a newly developed metaheuristic technique based on various chaotic grey wolf optimization algorithms. The applied optimization algorithms are becoming increasingly popular due to their simplicity, lack of gradient information needed, ability to bypass local optima, and versatility in power system applications. Results. The simulation results of both test systems confirm the robustness and efficiency of the chaotic logistic grey wolf optimization algorithm compared to the rest of the algorithms in terms of convergence to the global optimal solution and in terms of providing the best and minimum multi-objective functions-based power losses, voltage deviation and relay operation time values. Practical significance. Recommendations have been developed for the use of optimal allocation of hybrid systems for practical industrial distribution power systems with the renewable energy sources presence.Мета. Інтеграція фотоелектричної розподіленої генерації в активну розподільчу мережу швидко зросла завдяки її важливості для доставки чистої енергії, отже, участі у вирішенні різних проблем, таких як зміна клімату та забруднення. Додавання акумуляторних систем накопичення енергії може бути розглянуто як один з найкращих варіантів вирішення зазначених питань завдяки своїм характеристикам швидкої зарядки та розрядки, управління якістю енергії та задоволення піку енергетичних потреб. Новизна запропонованої роботи полягає у розробці нових багатоцільових функцій на основі суми трьох технічних параметрів сумарних втрат активної потужності, загальних відхилень напруги та загального часу спрацьовування реле захисту від перевантаження по струму. Мета. Стаття присвячена вирішенню проблеми розподілу гібридних фотоелектричних розподілених систем генерації та інтеграції систем накопичення енергії в стандартні активні розподільчі мережі з 33-шинами IEEE та 69-шинами IEEE. Методологія. Оптимальна інтеграція гібридних систем сформульована як мінімізація запропонованих багатоцільових функцій шляхом застосування нещодавно розробленої метаевристичної методики, заснованої на різних хаотичних алгоритмах оптимізації сірого вовка. Застосовані алгоритми оптимізації стають дедалі популярнішими завдяки своїй простоті, відсутності необхідної інформації щодо градієнту, можливості обходу локальних оптимумів та універсальності в застосуваннях щодо енергосистеми. Результати. Результати моделювання обох тестових систем підтверджують надійність та ефективність хаотичного логістичного алгоритму оптимізації сірого вовка в порівнянні з іншими алгоритмами з точки зору збіжності до глобального оптимального розв‘язання та з точки зору забезпечення найкращих і мінімальних багатоцільових функцій на основі втрат потужності, відхилення напруги та значень часу спрацювання реле. Практичне значення. Розроблено рекомендації щодо використання оптимального розподілу гібридних систем для реальних промислових розподільчих енергосистем із наявністю відновлюваних джерел енергії

Jack vertex operators and realization of Jack functions

We give an iterative method to realize general Jack functions from Jack functions of rectangular shapes. We first show some cases of Stanley's conjecture on positivity of the Littlewood-Richardson coefficients, and then use this method to give a new realization of Jack functions. We also show in general that vectors of products of Jack vertex operators form a basis of symmetric functions. In particular this gives a new proof of linear independence for the rectangular and marked rectangular Jack vertex operators. Thirdly a generalized Frobenius formula for Jack functions was given and was used to give new evaluation of Dyson integrals and even powers of Vandermonde determinant.Comment: Expanded versio

TUMEUR D’ASKIN. A PROPOS DE HUIT OBSERVATIONS

La tumeur d’Askin est une tumeur neuroectodermique primitive de la région thoracopulmonaire. Elle est rare représentant 6.5% des sarcomes, survenant chez l’enfant et le sujet jeune. Son pronostic est très défavorable ; la survie à 2 ans étant de 38% [1]. Le traitement est basé sur la chimiothérapie néo-adjuvante, suivie d'une chirurgie radicale si possible et/ou d'une irradiation, puis d'une chimiothérapie adjuvante selon la réponse de la tumeur à la chimiothérapie initiale [2,3] .Nous rapportons 8 cas de tumeurs d’Askin traités dans notre service. C’est une étude rétrospective de 8 cas de tumeurs d’Askin colligés au centre d’oncologie Ibn Rochd de Casablanca, durant la période 1998 -2003. Nous rapportons les résultats de notre expérience ainsi qu’une revue de la littérature

Modern insulation materials for warming of walls

Biodiversity hotspots understandably attract considerable conservation attention. However, deserts are rarely viewed as conservation priority areas, due to their relatively low productivity, yet these systems are home to unique species, adapted to harsh and highly variable environments. While global attention has been focused on hotspots, the world's largest tropical desert, the Sahara, has suffered a catastrophic decline in megafauna. Of 14 large vertebrates that have historically occurred in the region, four are now extinct in the wild, including the iconic scimitar-horned oryx (Oryx dammah). The majority has disappeared from more than 90% of their Saharan range, including addax (Addax nasomaculatus), dama gazelle (Nanger dama) and Saharan cheetah (Acinonyx jubatus hecki) - all now on the brink of extinction. Greater conservation support and scientific attention for the region might have helped to avert these catastrophic declines. The Sahara serves as an example of a wider historical neglect of deserts and the human communities who depend on them. The scientific community can make an important contribution to conservation in deserts by establishing baseline information on biodiversity and developing new approaches to sustainable management of desert species and ecosystems. Such approaches must accommodate mobility of both people and wildlife so that they can use resources most efficiently in the face of low and unpredictable rainfall. This is needed to enable governments to deliver on their commitments to halt further degradation of deserts and to improve their status for both biodiversity conservation and human well-being. Only by so-doing will deserts be able to support resilient ecosystems and communities that are best able to adapt to climate change. © 2013 John Wiley & Sons Ltd

The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory

The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments on ESA's far infrared and submillimetre observatory. It employs two Ge:Ga photoconductor arrays (stressed and unstressed) with 16x25 pixels, each, and two filled silicon bolometer arrays with 16x32 and 32x64 pixels, respectively, to perform integral-field spectroscopy and imaging photometry in the 60-210\mu\ m wavelength regime. In photometry mode, it simultaneously images two bands, 60-85\mu\ m or 85-125\mu\m and 125-210\mu\ m, over a field of view of ~1.75'x3.5', with close to Nyquist beam sampling in each band. In spectroscopy mode, it images a field of 47"x47", resolved into 5x5 pixels, with an instantaneous spectral coverage of ~1500km/s and a spectral resolution of ~175km/s. We summarise the design of the instrument, describe observing modes, calibration, and data analysis methods, and present our current assessment of the in-orbit performance of the instrument based on the Performance Verification tests. PACS is fully operational, and the achieved performance is close to or better than the pre-launch predictions

Some identities deriving from the nth power of a special matrix

In this paper, we consider the Horadam sequence and some summation formulas involving the terms of the Horadam sequence. We derive combinatorial identities by using the trace, the determinant and the n th power of a special matrix

The global decline of cheetah Acinonyx jubatus and what it means for conservation

Establishing and maintaining protected areas (PAs) are key tools for biodiversity conservation. However, this approach is insufficient for many species, particularly those that are wide-ranging and sparse. The cheetah Acinonyx jubatus exemplifies such a species and faces extreme challenges to its survival. Here, we show that the global population is estimated at ∼7,100 individuals and confined to 9% of its historical distributional range. However, the majority of current range (77%) occurs outside of PAs, where the species faces multiple threats. Scenario modeling shows that, where growth rates are suppressed outside PAs, extinction rates increase rapidly as the proportion of population protected declines. Sensitivity analysis shows that growth rates within PAs have to be high if they are to compensate for declines outside. Susceptibility of cheetah to rapid decline is evidenced by recent rapid contraction in range, supporting an uplisting of the International Union for the Conservation of Nature (IUCN) Red List threat assessment to endangered. Our results are applicable to other protection-reliant species, which may be subject to systematic underestimation of threat when there is insufficient information outside PAs. Ultimately, conserving many of these species necessitates a paradigm shift in conservation toward a holistic approach that incentivizes protection and promotes sustainable human–wildlife coexistence across large multiple-use landscapes

The clinical course and treatment of black mamba (Dendroaspis polylepis) envenomations: a narrative review

CONTEXT: The black mamba (Dendroaspis polylepis) is, due to its extremely toxic venom, one of the most dangerous snake species in Sub-Saharan Africa. A D. polylepis bite is a medical emergency and requires adequate action to prevent severe complications. However, there are no comprehensive reviews available based on clinical cases, and no readily accessible guidelines for standardized treatment. Therefore, we aim to provide an overview regarding the currently available clinical literature on D. polylepis envenomations; in order to promote knowledge on symptomatology and treatment options. METHODS: We searched for cases reporting humans bitten by D. polylepis in PubMed, Embase, Scopus, and Sabinet. We searched the reference lists of all eligible articles for additional articles. After quality assessment, 29 cases were included in this review. We used descriptive analysis to create an overview of the collected parameters. DISCUSSION: Among the included case reports and case series, D. polylepis envenomations most frequently resulted in decreased respiratory function, sweating and paralysis. The onset of symptoms usually occurred within 60 minutes. Neurological symptoms occurred more often than symptoms of autonomic dysfunction. In the reported cases most patients (26/29) received antivenom and most survived (25/29). We recommend the reporting of additional structured case reports to improve future analyses on the clinical course of envenomations, in order to improve public health response to D. polylepis envenomations

Protonated Montmorillonite Maghnite-H+ Clay Used as Green Non-toxic Catalyst for the Synthesis of Biocompatible poly (DXL -co- Styrene).

Copolymerization of 1,3-Dioxolane (DXL) with Styrene (St) catalyzed by Maghnite-H+ a montmorillonite sheet silicate clay exchanged with protons, was investigated. The cationic ring opening polymerization was initiated by Maghnite-H+ in bulk. The copolymer obtained was characterized by 1H-NMR, DSC and IR spectroscopy. The studies done, such as the effect of the amount of Maghnite-H+ on the syntheses of poly (DXL -co- Styrene)