Evacuation of SR power from the CLIC damping ring

Absorption of synchrotron radiation (SR) power generated by wigglers of damping rings is a difficult technical task. The CLIC damping ring operates with electron (or positron) beams with energy 2.424 GeV, average beam current is up to 150 mA. The 38 wigglers installed in one straight section of the CLIC damping ring produce radiation with a total power of about 122 kW. Power density at the end of the straight sections is about 75 W per square mm. Such a power density can destroy vacuum chambers, therefore a careful design and placement of appropriate radiation collimators and absorbers is required. In this paper we describe an algorithm to compute SR power density as well as options for safe absorption of SR power. All the calculations were performed for the current design of the CLIC damping ring and wigglers. Some related problems for absorption of high SR power are described

B.S. Zhukov is a Leader of the Moscow Paleoethnological School (based on correspondence with A.M. Tallgren)

B.S. Zhukov and A.M. Tallgren belong to the number of key figures in the Russian, Finnish and European archaeology of the 1920s. The founder of the paleoethnological direction of research at Moscow University was D.N. Anuchin with his famous triad – synthesis of prehistoric archaeology, anthropology and ethnography. In the early 1920s, Zhukov, his student, went further and put into practice his teacher's ideas by proposing a research program and uniting a team of young scientists – archaeologists, anthropologists, ethnologists, and specialists in other scientific disciplines. Zhukov, as a leader of the paleoethnological school, not only accepted Anuchin's idea of an interdisciplinary approach to the study of man in his past and present, but realized it during large-scale complex expeditions and in-depth scientific research. Zhukov's school as a scientific direction developed for a short time in the middle and second half of the 1920s. A generation of archaeologists, anthropologists and ethnologists who made invaluable contributions to the development of Russian and world science grew up there. These questions are under review in the presented article. It is based on the correspondence between B.S. Zhukov and the Finnish archaeologist A.M. Tallgren

Metals from the ritual site of Shaitanskoye Ozero II (Sverdlovsk Oblast, Russia) [Metales del yacimiento ritual de Shaitanskoye Ozero II (provincia de Sverdlovsk Oblast, Rusia)]

The present article describes materials from the ritual site of Shaitanskoye Ozero II, Sverdlovsk Oblast. Few excavations carried out at the site measuring less than 240 sq. m in size, yielded more than 160 bronze artifacts: utensils, weapons, rolled copper ornaments, and abundant smelting and casting waste. Apart from Seima-Turbino (celts and laminar knives) and Eurasian types (daggers with cast hilts, truncated knives with guards, fluted bracelets and rings), several metal artifacts were revealed manufactured in the style of the Samus-Kizhirovo tradition. Bronze artifacts, stone knives and scrapers, and numerous arrowheads are accompanied by ceramics of the Koptyaki type. Metals use mainly a copper-tin alloy. This assemblage is shown to be relevant to the local tradition of metalworking, which, in this particular region, was comparatively ancient having been left uninterrupted by the rapid migrations of the Seima-Turbino people. In addition, the assemblage indicates the sources from which post-Seima artifacts reached the Alakul people. These artifacts may also have been linked with a large metalworking center located in the Middle Urals

Basic principles and characteristics of technology problem-modular training

The article discusses the concept of educational technology, the basic principles and characteristics of the technology problem-modular trainingВ статье рассматриваются понятие образовательной технологии, основные принципы и характеристики технологии проблемно-модульного обучени

B.S. Zhukov’s Letters to M.V. Voyevodsky (1925–1929)

B.S. Zhukov’s letters belong to the period of his most productive scientific, pedagogical and administrative activity. Five letters and two postcards were addressed to M.V. Voyevodsky in 1925–1929. Zhukov appears in them as the head of the Vetluga and Anthropological complex expedition and as a leader of the unique scientific team – the Paleo-ethnological laboratory of the Institute of Anthropology of the 1 MSU (Moscow State University). The correspondence reveals ins and outs of Zhukov's own studies, his students and specialists research, the manner and style of Boris Sergeyevich's leadership and communication with his subordinates. Zhukov, organized and demanding to himself, is in the same measure strict with colleagues if it concerns their common cause. His letters to Voyevodsky are an important documentary source for the history of the Moscow Paleo-ethnological school of the 1920s. They acquaint us with the organization of its expedition, cameral and scientific work, the results of excavations on Vetluga River, in the basins of the Oka and Upper Volga, news from Zhukov's official journey to Gelendzhik and even to Germany

The role of reflection in the formationof professional training bachelors

This article tells about the role of reflection in the formation of professional training bachelors. Reflection is a process of transforming stereotypes and it is seen as the basis for creating new ideas and bringing in new experienceВ статье рассматривается роль рефлексии в подготовке бакалавров профессионального обучения. Рефлексия выступает как процесс преобразования стереотипов опыта, лежит в основе порождения новых идей, внедрения нового опыта в практик

Book Reading Practices: Experience of Diary Studies

Благодарности: выражаю благодарность своему научному руководителю Новгородцевой А. Н. за ценные советы при планировании и проведении исследования.Acknowledgments: I express my gratitude to my supervisor Novgorodtseva A. N. for valuable advice in planning and conducting research.В статье приводятся результаты проведения дневникового исследования практик чтения книг среди молодежи г. Екатеринбург (собрано 8 дневников), в рамках которого проведено сравнение практик чтения книг с чтением интернет-контента, в частности на уровне эмоциональной вовлеченности, выбора ситуативности или «тотальности» практики.The article presents the results of a diary study of book reading practices among young people in Yekaterinburg (8 diaries were collected) and a comparison of book reading practices with Internet-reading, in particular, at the level of emotional involvement, the choice of “situational” or “total” practices

B.S. Zhukov and his Contacts Abroad

B.S. Zhukov is one of the few Soviet archaeologists known in Europe. However, international contacts still remain the least studied page of his biography. The authors discuss two episodes related to this topic. The first one is connected with B.S. Zhukov's trip to Berlin in 1929 and his speech at the International Archaeological Congress, dedicated to the 100th anniversary of the founding of the German Archaeological Institute, as well as with the correspondence of the scientist with the administration of this institute. The second one concerns B.S. Zhukov's dialogue with the German archaeologist Gero von Merhart. Within the framework of article the documents valuable for the history of science are published in Russian for the first time: the text of B.S. Zhukov’ paper «Tardenoise in the Crimea. Neolithic in the Volga region», published in the collection of materials of the Berlin Congress in 1930, a letter from the scientist to the administration of the German Archaeological Institute, in which he thanks for being elected a corresponding member of the Institute and makes comments on the proofreading of the report, as well as a letter from B.S. Zhukov to G. Merhart, that is kept in the personal archive of the German archaeologist at the University of Marburg

Encryption Algorithms in IoT: Security vs Lifetime

IoT devices are inherently limited by their processing capabilities and power capacity. While aiming to maximise their lifespan, one of the biggest challenges they face is to reduce the computational burden, especially for tasks such as encryption, data transmission, or compression. This paper investigates the lifespan of an IoT device transmitting encrypted data as a function of the encryption algorithm used and the packet length. We focus the analysis particularly on lightweight algorithms popular in IoT ecosystems, such as AES, XTEA, HIGHT, KLEIN, ECC, PRESENT, Serpent, Piccolo, Blowfish, and Twofish. The results of the study indicate that the type of data encryption used for transmission has a significant impact on the IoT device lifetime, together with the data length and the input parameters used. To summarise, the Piccolo algorithm is the most energy-efficient, leading to maximum lifetime and low power consumption, followed by AES, XTEA, and KLEIN. At the other end of the spectrum, ECC, Blowfish, Twofish, PRESENT, and Serpent have high power consumption, hence they should be less preferred for the device-to-device or device-to-gateway IoT communication. Aside from the acknowledged energy efficiency of ciphers based on substitution-permutation operations versus Feistel ones, the results show that algorithms of first group, such as Serpent and PRESENT, require significant encryption and decryption times, while Feistel ciphers such as Piccolo, XTEA and HEIGHT are notably fast