A Study on the Harmonic Resonance during Energizing Primary Restorative Transmission Systems: Korean Power System Case

In this paper, a power system restoration study following a massive or complete blackout was performed. The power system restoration process from a complete shutdown system without the operating generation and load starts with energizing primary restorative transmission systems. During this primary restoration process, unexpected over-voltage may occur due to nonlinear interaction between the unloaded transformer and the transmission system. This is known as the harmonic resonance phenomenon that may cause the burning out of a transformer or other devices. So far, harmonic resonances have been reported in some extra-high voltage systems around the world. Since the harmonic resonance originates from the nonlinear characteristics of the power system components, it is very difficult to predict the occurrence of this phenomenon. This paper reports the analyses of the harmonic resonance that can occur in the Korean power system. In addition, through calculating the required buffer load compared to the length of the line, a solution that changes the length of the restoration path impedance considering the specificity of the Korean system was presented. The various analyses of harmonic overvoltage, including methodologies that are used internationally as comparison groups, are provided based on PSCAD/EMTDC simulations.

Melatonin, tunneling nanotubes and anastasis: Cheating cell death

When healthy neurons are exposed to toxins or physiological insults such as ischemia, apoptosis is often initiated. Once underway, this mechanistically-well described process was thought to routinely run its course with the disintegration of the cell and phagocytosis of the debris. Within the last decade, the consistency of this process has been questioned. It is now known that some damaged cells can recover, i.e., they avoid death; this restoration process is referred to as anastasis. The reestablishment of a healthy cell phenotype is highly energy-requiring, so optimally functioning mitochondria are obviously beneficial during the regenerative process. Some healthy mitochondria that end up in regenerating cells are transferred there by adjacent healthier cells through tunneling nanotubes. Tunneling nanotubes generally form under stressful conditions when these micron-size tubules link adjacent cells. These tubules transfer soluble factors and organelles, including mitochondria, between the connected cells. When damaged cells receive high APT-producing mitochondria via this means, they support the ability of the cells to recover. Two recent comprehensive publications show that melatonin aids the transfer of mitochondria through nanotubes that connect neurons thereby likely assisting the recovery of the damaged recipient cell. Thus, melatonin not only protects normal neurons from damage by neutralizing the agents that initiate apoptosis, e.g., free radicals, etc., but also reverses this process once it is underway.

Restoration of the silhouette “Emperor Nicholas I and the Cadet Bubnov”

В статье представлено описание реставрации силуэта «Император Николай I и кадет Бубнов», переданного наряду с другими силуэтами в лабораторию научной реставрации графики из отдела истории русской культуры Государственного Эрмитажа. Композиция предмета состоит из бумажного силуэта в рамке золотого цвета, наклеенного на черный глянцевый фон, бумажную и картонную подложки. Данный силуэт передан в реставрацию из-за повреждений, имеющих тенденцию к развитию и неблагоприятных как для состояния сохранности бумаги-основы, так и для красочных слоев. Исследования бумаги позволили выявить визуально незаметный слой свинцовых белил на поверхности силуэта. В процессе реставрации была открыта исторически значимая надпись «Подарок Мейбаумъ 4. 28 августа 1835». Мы можем предположить, что надпись указывает на автора силуэта, воспитанника Первого кадетского корпуса Мейбаума, либо на его родственника, подарившего силуэт. С каждым элементом предмета проведены реставрационные мероприятия. Основная часть работ выполнена над бумажным силуэтом, имеющим не только пятна, но и разрывы вследствие деформации бумажной основы и картона. Особенностями оформления композиции после реставрации является инкапсулирование силуэта в полиэфирную пленку, предотвращающую взаимодействие свинцовых белил с воздухом, и крепление всех элементов конструкции по верхнему краю. После реставрации сохранен авторский замысел: инкапсулированный силуэт на черном глянцевом фоне, окаймленный рамкой золотого цвета, крепится к бумажной подложке. The article presents a description of the restoration of the silhouette “Emperor Nicholas I and the Cadet Bubnov” which was transferred along with other silhouettes to the Laboratory for Scientific Restoration of Graphics from the Department of the History of Russian Culture of the State Hermitage Museum. The composition of the subject consists of a paper silhouette in a gold frame, pasted on a glossy black background, paper and cardboard backings. This silhouette was handed over for restoration due to damages that tended to develop and were unfavorable both for the state of preservation of the base paper and for the paint layers. The paper studies made it possible to reveal a visually imperceptible layer of lead white on the silhouette surface. During the restoration process, the historically significant inscription “Gift of Meibaum 4. August 28, 1835” was discovered. We can assume that the inscription points to the author of the silhouette, a student Meibaum studied in the First Cadet Corps, or to his relative who donated the silhouette. Restoration procedures have been carried out with each element of the object. The main part of the work has been done on a paper silhouette, which had not only spots, but also tears due to the deformation of the paper support and cardboard. The features of the composition design after restoration are the encapsulation of the silhouette in a polyester film, which prevents the interaction of lead white with air, and the fastening all structural elements along the upper edge. After the restoration the author's idea has been kept: the encapsulated silhouette on a black glossy background, bordered by the golden frame, is attached to a paper backing.

INTERIOR DESIGN IN THE RESTORATION OF THE NATIONAL MUSEUM OF PLASTIC ARTS OF MOLDOVA

This paper presents a scientific analysis of interior design in the restoration process of the National Museum of Arts of Moldova. The interior design segment is historically researched through the genre of architecture, from the historical compartment of the XIX-XX century. In the same context, several works of various architects who designed important constructions in Kishinev are analyzed. The study highlights the role and responsibility of interior design in the process of restoration and capitalization of the national cultural heritage. It also analyzes the correspondence or synchronization of new implementations in design with the stylistic concept achieved in the historical period.

Chinese Ethnic Minorities and their Oral Poetry: A Perspective from Ethnopoetics

Ethnopoetics involves in the conducting of translation experiments on oral poems of native ethnic groups, converting its relevant oral texts into written forms. The theory of ethnographic poetry begins in the 1970s and was translated and introduced to China in the early 21st century. However, most ethnic minorities in China do not have textual writings. Their oral creations from primitive society to modern society such as epics, long poems, narrative poems, ballads, and folk songs are mostly in form of oral poetry. The collection and translation of oral poems of ethnic minorities in China began in the late 1950s, that demarcated the beginning of ethnopoetics in China. In this article, the reasons behind the collection and translation of Chinese ethnic minority oral poems will be analysed. The restoration process of ethnopoetics and the connections between the collections and the translations, and the issues on whether translation is consistent to Chinese ethnic minority oral poems will also be further elaborated. The history of Chinese ethnic minorities oral poetry traces back to a long history and consists of a variety of themes and contents. Therefore, the restoration process of ethnopoetic research on the relationship between oral culture and written culture not only have gained the attention from the Chinese academic community, but also shown strong interests by the Western academic research community and worldwide.

A Mural at the Southwest Corner of the Mohan Chowk: Piece of History – Rediscovered

During the restoration process, the experts from JAICA, made a chance discovery of a mural. But unfortunately, its viewing was/is almost totally blocked by an extra wall, built right in-front of the actual wall, with the murals. To demystify the contents, it has had remained a professional challenge, as it could be barely viewed by one end only – from within a space between 8-9 inches gap. It posed challenge for many reasons. First was its difficult location. Secondly, the painted wall was also damaged beyond descriptions – plaster-surface peeled off spread all over – making the task to read the images even harder. Most importantly, to read the contents or to identify the imageries in such a location, it asked for a professional ability of an art writer or an art historian, to be able to read and analyze. However, after a very meticulous effort and a proper reading of the postures, emblems and other iconographical features, the narratives are being made – explaining on and about the murals found. The essay is prepared and is made, after a series of exercises – begun by field visits, and followed by closer examination of the images on the spot and as is available in digital images. The writing is made - after the long afterthoughts, and in consultation with the available references.