Monatomic phase change memory

Phase change memory has been developed into a mature technology capable of storing information in a fast and non-volatile way, with potential for neuromorphic computing applications. However, its future impact in electronics depends crucially on how the materials at the core of this technology adapt to the requirements arising from continued scaling towards higher device densities. A common strategy to finetune the properties of phase change memory materials, reaching reasonable thermal stability in optical data storage, relies on mixing precise amounts of different dopants, resulting often in quaternary or even more complicated compounds. Here we show how the simplest material imaginable, a single element (in this case, antimony), can become a valid alternative when confined in extremely small volumes. This compositional simplification eliminates problems related to unwanted deviations from the optimized stoichiometry in the switching volume, which become increasingly pressing when devices are aggressively miniaturized. Removing compositional optimization issues may allow one to capitalize on nanosize effects in information storage

Zehra’nın sonu

İhsan'ın İleri'de tefrika edilen Zehra’nın Sonu adlı roman

Miras

Memduh Şevket Esendal'ın Mustafa Memduh adıyla Meslek'te tefrika edilen Miras adlı romanıTelif hakları nedeniyle romanın tam metni verilememiştir.Süreli yayın kapandığından tefrika yarım kalmıştır

The impact of using wordlists in the language classroom on students’ vocabulary acquisition

Vocabulary has always been an area of interest for many researchers since words represent “the building block upon which knowledge of the second language can be built” and without them people cannot convey the intended meaning (Abrudan, 2010). Nation (1988) emphasised if teachers want to help their learners to deal with unknown words, it would be better to spend more time on vocabulary learning strategies rather than spending time on individual words. However, Schmitt in Schmitt and McCarthy (1997:200) stated that among vocabulary learning strategies only ‘guessing from context’ and ‘key word method’ have been investigated in depth. Therefore, there is need for more research on vocabulary learning whose pedagogical implications may contribute to the field of second language learning. Considering the above-mentioned issues, vocabulary is a worthwhile field to investigate. Hence, this paper aims at proposing a framework for vocabulary teaching strategy in English as a foreign language context.publisher versio

Повышение эффективности взаимодействия проектировщиков бортовой радиоэлектронной аппаратуры космических аппаратов на базе интеграции информационных систем

Предложен подход реализации информационного взаимодействия проектировщиков бортовой радиоэлектронной аппаратуры, повышающий эффективность использования ресурсов и управление производственными процессами. Представлена концепция практической реализации предложенного подхода в среде PLM-системы Enovia SmarTeam. Разработан алгоритм сохранения данных проектов EDA-системы Altium Designer в хранилище данных PLM-системы Enovia SmarTeam. Сформирован механизм генерации конструкторских документов на базе формата хранения данных JSON

Picosecond electric-field-induced threshold switching in phase-change materials

Many chalcogenide glasses undergo a breakdown in electronic resistance above a critical field strength. Known as threshold switching, this mechanism enables field-induced crystallization in emerging phase-change memory. Purely electronic as well as crystal nucleation assisted models have been employed to explain the electronic breakdown. Here, picosecond electric pulses are used to excite amorphous Ag$_4$In$_3$Sb$_{67}$Te$_{26}$. Field-dependent reversible changes in conductivity and pulse-driven crystallization are observed. The present results show that threshold switching can take place within the electric pulse on sub-picosecond time-scales - faster than crystals can nucleate. This supports purely electronic models of threshold switching and reveals potential applications as an ultrafast electronic switch.Comment: 6 pages manuscript with 3 figures and 8 pages supplementary materia

Разработка модели статического преобразователя напряжения

In this paper hybrid simulation approach for adequate modeling of Voltage Source Converter (VSC) of Highvoltage direct current (HVDC) systems as part of real electric power systems (EPS) is presented. The proposed VSC model allows to carry out the adequate simulation of different switching processes in VSC HVDC and EPS as a whole without any decomposition and limitation on their duration

Tunable volatility of Ge2Sb2Te5 in integrated photonics

This is the final version. Available from the publisher via the DOI in this record.The operation of a single class of optical materials in both a volatile and nonvolatile manner is becoming increasingly important in many applications. This is particularly true in the newly emerging field of photonic neuromorphic computing, where it is desirable to have both volatile (short-term transient) and nonvolatile (long-term static) memory operation, for instance, to mimic the behavior of biological neurons and synapses. The search for such materials thus far have focused on phase change materials where typically two different types are required for the two different operational regimes. In this paper, a tunable volatile/nonvolatile response is demonstrated in a photonic phase-change memory cell based on the commonly employed nonvolatile material Ge2Sb2Te5 (GST). A time-dependent, multiphysics simulation framework is developed to corroborate the experimental results, allowing us to spatially resolve the recrystallization dynamics within the memory cell. It is then demonstrated that this unique approach to photonic memory enables both data storage with tunable volatility and detection of coincident events between two pulse trains on an integrated chip. Finally, improved efficiency and all-optical routing with controlled volatility are demonstrated in a ring resonator. These crucial results show that volatility is intrinsically tunable in normally nonvolatile GST which can be used in both regimes interchangeably.Engineering and Physical Sciences Research Council (EPSRC)European CommissionEuropean Research Council (ERC)Deutsche Forschungsgemeinschaf