Unconventional magnetism in all-carbon nanofoam

We report production of nanostructured carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp2 and sp3 bonded carbon atoms. The material is a novel form of carbon in which graphite-like sheets fill space at very low density due to strong hyperbolic curvature, as proposed for ?schwarzite?. The foam exhibits ferromagnetic-like behaviour up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.Comment: 14 pages, including 2 tables and 7 figs. Submitted to Phys Rev B 10 September 200

Profiling Occupant Behaviour in Danish Dwellings using Time Use Survey Data - Part I: Data Description and Activity Profiling

The human interaction with the building is a key cause of uncertainty when predicting energy consump- tion of buildings. Building occupants affect building energy use directly and indirectly by interacting with building energy systems, for example, by adjusting thermostats, switching lights on/off, using electri- cal devices and opening/closing windows. The occupants’ daily activity profiles and occupancy patterns clearly shape the timing and magnitude of energy demand in households. Modelling energy-related hu- man activities throughout the day, therefore, is a crucial task for prediction of energy use and, conse- quently, to reduce the gap between real and predicted building energy use. This study modelled data gathered in the diary-based Danish Time Use Survey (TUS) 2008/09 of 9640 individuals from 4679 households. Individuals’ daily activities were logged in 10-min time increments for 24 h, starting and ending at 04:00, during both weekdays and weekends. The aims of this study were to (i) profile energy-related daily activities of occupants during different seasons and weekdays/weekends (ii) investigate time-related characteristics of activities such as starting and ending times and durations, and (iii) profile occupancy patterns for weekdays/weekends for different household types. The outcomes provide valuable input for building energy simulation for bridging the gap between simulated and real energy consumption in the Danish residential sector; typical occupancy profiles for different household types for different days of the week are freely available online[1]

Wiki-based Collaborative Learning Experience in a Foreign Language Blended Course

The article emphasizes the educational potential of wikis for learning foreign languages. It focuses on students’ collaboration based on integration of different types of activities within a highly motivating blended learning environment where learners can interact and share their ideas. The study aims to understand if wikis could enhance online collaboration and positively affect students’ attitudes to group work. It tries to explore the level of participation and contribution of students in wiki-based activities, as well as their attitude to this type of online collaboration

Утилизация отходов биологического производства

В статье рассматривается проблема утилизации отходов, так как в год Экологии это тема стала актуальной. На каждом предприятии и в каждом доме увеличилось количество мусора и от этого страдает экологическая обстановка в каждом городе. В статье подробно узучена тема биологического производства. К биологическим отходам относятся ткани и органы, образующиеся в результате медицинской и ветеринарной оперативной практики, медико-биологических экспериментов, гибели скота, других животных и птиц, и другие отходы, получаемые при переработке пищевого и непищевого сырья животного происхождения, а также отходы биотехнологической промышленности.The article deals with the problem of waste disposal as in the year of the Environment this issue has become topical. Every enterprise and every household increased the amount of debris and suffers the environmental situation in each city. The article Azucena the theme of biological production. Biodegradable waste includes tissues and organs resulting from operational medical and veterinary practice, medical and biological experiments, loss of livestock, other animals and birds, and other waste obtained in the processing of food and non-food raw materials of animal origin and waste products of the biotechnology industry

Роль информационных технологий в защите окружающей среды и здоровье человека

В этой статье анализируется роль информационных технологий (ИТ) в обеспечении общественного доступа к экологической информации. Также указаны отношения между применением ИТ и уровнем информированности общественности об окружающей среде и влияние этих отношений на охрану окружающей среды. В статье рассматривается роль ИТ в защите здоровья человека.This article analyzes the role of information technology (IT) in providing public access to environmental information. Also, the relationship between the application of IT and the level of public awareness of the environment and the impact of these relations on environmental protection are indicated. The article examines the role of IT in protecting human health

Analysis and design of solid-state circuits utilizing the NASA analysis computer program Annual report

Network Analysis for Systems Application Program /NASAP/ applicable in analysis and design of solid state circuit