1,721,536 research outputs found
Time-varying structural vector autoregressions and monetary policy: A corrigendum
Full text linkThis note corrects a mistake in the estimation algorithm of the time-varying structural vector autoregression model of Primiceri (2005) and proposes a new algorithm that correctly applies the procedure proposed by Kim, Shephard, and Chib (1998) to the estimation of VAR or DSGE models with stochastic volatility. Relative to Primiceri (2005), the correct algorithm involves a different ordering of the various Markov Chain Monte Carlo steps
Replication data for: Prior Selection for Vector Autoregressions
No full textGiannone, Domenico, Lenza, Michele, and Primiceri, Giorgio E., (2015) "Prior Selection for Vector Autoregressions." Review of Economics and Statistics 97:2, 436-451
Replication data for: Prior Selection for Vector Autoregressions
No full textGiannone, Domenico, Lenza, Michele, and Primiceri, Giorgio E., (2015) "Prior Selection for Vector Autoregressions." Review of Economics and Statistics 97:2, 436-451
Cooling Systems in Data Centers: State of Art and Emerging Technologies
Full text linkThe growing number, size, complexity and energy density of data centers due to increasing demand for storage, networking and computation bring a considerable energy challenge. Several measures to improve energy efficiency are being studied, not only to allow a supportable industry growth but also to reduce operational costs. Cooling energy consumption constitutes a large portion of the total consumption of data centers, which can account up to 40% in the case of inefficient cooling systems. In this paper a critical discussion on existing and emerging technologies for data center cooling systems was carried out. Fundamental aspects concerning advantages and drawbacks of each examined cooling system were discussed. Moreover a critical analysis on next future technology solutions for obtaining high energy efficiency data center is performed
Il regime internazionale del Porto Franco di Trieste. Uno strumento di promozione dei traffici nell'Alto Adriatico
No full textAn overview on state-of-art and future application fields of BLDC motors : design and characterization of a PC-interfaced driving and motion control system
Full text linkNew generations of equipments must have better performances respect to the previous generations, such as higher efficiency, low power consumption, reduced electromagnetic interference, small dimensions, lightness and so on; all these improvements must be achieved while maintaining, at the same time, systems cost as low as possible. Brush-Less Direct
Current (BLDC) motors, employed even more in the last years in many equipments in various application fields, present low maintenance costs, compact size, high reliability, efficiency, low power consumption and other optimum features, proposing themselves as excellent candidates for satisfying the stringent requirements mentioned previously. In this paper,
after a detailed overview on the current and possible future application fields of BLDC motors, from home appliances, to automotive, industrial automation, medical equipments and robotic instrumentation, the design and realization of a driving and control system of a BLDC motor, with Hall sensors embedded, is presented. A BLDC motor is provided by permanent
magnets on moving part (rotor) and windings on fixed part (stator); energized stator windings create electromagnetic poles and the rotor (equivalent to a bar magnet) is attracted by the energized stator phase. By using appropriate sequence to supply stator phases, a rotating field on stator is created and maintained. The lead between rotor and rotating field must be
controlled to produce torque and this synchronization implies accurate knowledge of rotor position which is obtained by means of the embedded Hall effect sensors. The realized driving system is composed by three principal blocks: the control electronic board, the power driving board and the BLDC motor. By PC connected via USB with the driving board, the user
can choose the motor rotation direction, set the desired rpm value and, by varying potentiometer value located on board, change the rotation speed. Different tests were performed for verifying the correct motor operation and the results show that all the employed devices, driving board, control board and BLDC motor, work properly
Solar-powered LED-based lighting facilities: an overview on recent technologies and embedded IoT devices to obtain wireless control, energy savings and quick maintenance
Full text linkAim of this paper is to illustrate and describe the trend of last technological innovations and new IoT-based devices employed in solar-powered LED-based lighting systems, in order to obtain energy savings, low mainteinance costs and to offer additional services to the users or community. Technological developments, in the last years, have allowed the use of LEDs technology in many general illumination applications, from houses to commercial or outdoor spaces. LED lighting is projected to reduce related energy consumption of 15% in 2020 up to 40% in 2030; in this contest, solarpowered LED lighting facilities offer a significant contribution to obtain energy savings, together with substantial environmental and health benefits. Last innovations in nanotechnology and quantum physics have the potential to strongly increase the electrical power obtained from solar panels for feeding any portable device. Furthermore, the spread of Internet of Things (IoT) and the huge use of smartphones and related apps allow wirelessly to control and drive the LED-based lighting systems, that also can be provided with integrated sensors thus realizing new functionalities, an improved management of energy and new services for smart cities. Finally, systems made up of connected lighting devices could
become data collection platforms that, making use of renewable energies, enable even greater energy savings referred to
lighting and in general electrical facilities present in smart buildings or cities
Wireless Monitoring System of Household Electrical Consumption with DALY-based Control Unit of Lighting Facilities Remotely Controlled by Internet
Full text linkAim of this paper is to present a wireless monitoring smart system of household electrical facilities, with ZigBee/WiFi transceivers, able to detect absorbed current from electrical loads, to calculate dissipated power and energy by means of PIC-based software and to view, in real-time, calculated consumption values on web page properly realized for user’s remote control. Depending on light/presence sensors’ signal, the realized system can switch on/off the monitored electrical loads for obtaining energy saving and user satisfaction. Also by sending DALI-standard commands to slave loads (e.g lighting facilities based on LEDs), the user can monitor, remotely by using a tablet/smartphone connected to internet, the operation’s state and adjust the light intensity of each light point for achieving different scenarios. All functional tests, carried out on realized PCB prototype, have provided positive results allowing the use for the monitoring/driving of a real house’s electrical facilities
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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