2,584 research outputs found
XMILE:An XML-based approach for programmable networks
In this paper we describe an XML-based platform for dynamic active node policy updates. XML supports the definitionof specific policy languages, their extension to satisfy new needs and the management of deployed policies on differentactive nodes. We show an example of the management of router packet forwarding policies where the XML policiesthat drive the packet routing are updated at run-time on the active nodes depending on the network status. The platformdecouples policy management, which is handled through XML interpretation, from packet forwarding that, forperformance reasons has to be implemented in more efficient languages
Primaire biliaire cirrhose met sclerodermie en hypothyreoidie
Contains fulltext :
4297.pdf (publisher's version ) (Open Access
Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator
We present the design and implementation of a mechanical low-pass filter
vibration isolation used to reduce the vibrational noise in a cryogen-free
dilution refrigerator operated at 10 mK, intended for scanning probe
techniques. We discuss the design guidelines necessary to meet the competing
requirements of having a low mechanical stiffness in combination with a high
thermal conductance. We demonstrate the effectiveness of our approach by
measuring the vibrational noise levels of an ultrasoft mechanical resonator
positioned above a SQUID. Starting from a cryostat base temperature of 8 mK,
the vibration isolation can be cooled to 10.5 mK, with a cooling power of 113
W at 100 mK. We use the low vibrations and low temperature to demonstrate
an effective cantilever temperature of less than 20 mK. This results in a force
sensitivity of less than 500 zN/, and an integrated
frequency noise as low as 0.4 mHz in a 1 Hz measurement bandwidth
Локальные элиминационные алгоритмы обработки запросов в базах данных
Рассмотрено использование локальных элиминационных алгоритмов (ЛЭА) для обработки запросов в реляционных базах данных. Обсуждаются особенности реализации локального алгоритма, использующего лишь прямую часть.Розглянуто використання локальних елімінаційних алгоритмів (ЛЕА) для обробки запитів в реляційних базах даних. Обговорюються особливості реалізації локального алгоритму, що використовує лише пряму частину.The applying local elimination algorithms (LEA) for processing queries in relational databases is considered. The special features of realization of local algorithm using only a forward part are discussed
Review on the conversion of thermoacoustic power into electricity
Thermoacoustic engines convert heat energy into high amplitude acoustic waves
and subsequently into electric power. This article provides a review of the
four main methods to convert the (thermo)acoustic power into electricity.
First, loudspeakers and linear alternators are discussed in a section on
electromagnetic devices. This is followed by sections on piezoelectric
transducers, magnetohydrodynamic generators, and bidirectional turbines. Each
segment provides a literature review of the given technology for the field of
thermoacoustics, focusing on possible configurations, operating
characteristics, output performance, and analytical and numerical methods to
study the devices. This information is used as an input to discuss the
performance and feasibility of each method, and to identify challenges that
should be overcome for a more successful implementation in thermoacoustic
engines. The work is concluded by a comparison of the four technologies,
concentrating on the possible areas of application, the conversion efficiency,
maximum electrical power output and more generally the suggested focus for
future work in the field.Comment: The following article appeared in J. Acoust. Soc. Am 143(2) and the
final version in a proper two-column format may be found at:
http://scitation.aip.org/content/asa/journal/jasa/143/2/10.1121/1.502339
Разработка и изготовление действующей модели роликовой транспортной системы для ГПС
There is increased interest in the potential protective role of dietary Ca in the development of metabolic disorders related to the metabolic syndrome. Ca-induced intestinal precipitation of fatty acids and bile acids as well as systemic metabolic effects of Ca on adipose tissue is proposed to play a causal role. In this experiment, we have studied all these aspects to validate the suggested protective effect of Ca supplementation, independent of other dietary changes, on the development of diet-induced obesity and insulin resistance. In our diet intervention study, C57BL/6J mice were fed high-fat diets differing in Ca concentrations (50 v. 150 mmol/kg). Faecal excretion analyses showed an elevated precipitation of intestinal fatty acids (2.3-fold;
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