Restoration of Buildings and Monuments
Bauinstandsetzen und Baudenkmalpflege
Vol. 19, No. 2/3, 195–202 (2013)
Fire Reaction and Mechanical PerformanceAnalyses of Polymer
Concrete Materials Modified with Micro and Nano Alumina Particles
M. C. S. Ribeiro1*, C. M. C. Pereira1, S. P. B. Sousa1, P. R. O. Nóvoa2 and A. J. M. Ferreira2
1 INEGI - Institute of Mechanical Engineering and Industrial Management, Porto, Portugal
2 FEUP - Faculty of Engineering of University of Porto, Porto, Portugal
*Corresponding author: M. C. S. Ribeiro, E-mail: cribeiro
The paper addresses an important element of the European energy sector: the evaluation of district heating (DH) system operations from the standpoint of increasing energy efficiency and increasing the use of renewable energy resources. This has been done by developing a new methodology for the evaluation of the heat tariff. The paper presents an algorithm of this methodology, which includes not only a data base and calculation equation systems, but also an integrated multi-criteria analysis module using MADM/MCDM (Multi-Attribute Decision Making / Multi-Criteria Decision Making) based on TOPSIS (Technique for Order Performance by Similarity to Ideal Solution). The results of the multi-criteria analysis are used to set the tariff benchmarks. The evaluation methodology has been tested for Latvian heat tariffs, and the obtained results show that only half of heating companies reach a benchmark value equal to 0.5 for the efficiency closeness to the ideal solution indicator. This means that the proposed evaluation methodology would not only allow companies to determine how they perform with regard to the proposed benchmark, but also to identify their need to restructure so that they may reach the level of a low-carbon business.
multi-perspective modeling approach
with different viewpoints regardingworkflow, architecture
and component behavior. We combine it with delta mod-
eling to seamlessly capture variability and evolution by
the same means on each of the viewpoints. We show how
the separation in different viewpoints enables early perfor-
mance analysis as well as code generation. The approach
is illustrated using a case study.
Keywords: Model-driven Development, Variability, Evolu-
rungssoftware sind durch eine
agenda for this journal. These include defining the boundaries and
interfaces of the sector with those of government and business; articulating how the third sector
can be held accountable for its performance; analyzing how nonprofits can become more effective
in advocating for constructive social change; and assessing how the sector can contribute more
effectively to economic well-being, the protection of the global environment, the energy needs of
citizens’ worldwide, the security concerns of citizens in the context of global terrorism and inter-
group conflicts, the
flight envelops [ 43 , 52 ], (vi) evaluating the sustainability performance of aircraft engines [ 3 , 26 , 37 , 39 , 41 , 42 , 47 , 50 , 51 ], (vii) assessing the environmental damage cost analysis of turboprop engine [ 3 ], and (viii) detecting the unavoidable/avoidable and endogenous/exogenous exergy destruction portions within the aircraft engines by advanced exergy methodology [ 28 , 40 , 53 , 54 ] Through a literature review, it is noticed that any studies on the performanceanalyses of the exergoeconomic, sustainability and environmental damage cost
This study focuses on for a PW4000 high-bypass turbofan engine using energy, exergo-sustainable and performance viewpoint. For this aim, irreversibility and performance analyses are firstly performed for five main engine components at ≈260 kN maximum take-off thrust force. Besides, overall efficiency of the turbofan is determined to be 33 %, while propulsive and thermal efficiency of the turbofan are 72 % and 46 % respectively at 0.8 M and 288.15 K flight conditions. Secondly, calculation component-based exergetic assessment is carried out using exergetic indicators. According to the calculation, the exergetic efficiency of the engine is 32 %, while its waste exergy ratio is 0.678. Furthermore, exergetic sustainability measure is obtained as 0.473, while enviromental effect factor is 2.112. These indicators are also anticipated to help comprehend the connection between engine performance parameters and worldwide dimensions such as environmental effect and sustainable growth.
This paper explores the design of multiservice code (MS) in spectral, time spreading and wavelength domains (3-Dimensional). The proposed 3D code is designed in such a manner that follows the ideal in phase unit cross correlation in spectral, time spreading and wavelength domains. The proposed encoder generates the MS code effectively in 3D domain and decoder suppresses the multi-user interferences successfully. Performance analyses are carried out by considering the all noises such as phase induce intensity noise(PIIN), shot noise and thermal noise. The analysis of 3D-MS code for variable code length is also performed for measurement of variation in bit error rate against the received power and number of active users in the design. The observed performances are also compared with existing codes such as 2D-MDW, 3D-PDC and 1D-MS code and the proposed code shows the better performance. The analysis of bit error rate of proposed code is carried out against the number of users at 0.622Gbits/s data rate and 0 dBm received power and comparison is also formed with the existing code such as 3D PD(M=21, N=3, P=3), 2DMDW(M=63, P=3), PDC(M=57, P=3) and 1D MS Code. It is noted that 3D MS code shows the better performance than the existing methods. Analysis is also evaluated for variable weight and variable length codes in order to observe the variation in bit error rate with variation in received power and number of simultaneous users.
Optimization techniques may be effective in finding the best modeling and shapes for reinforced concrete reservoirs (RCR) to improve their durability and mechanical behavior, particularly for avoiding or reducing the bending moments in these structures. RCRs are one of the major structures applied for reserving fluids to be used in drinking water networks. Usually, these structures have fixed shapes which are designed and calculated based on input discharges, the conditions of the structure's topology, and geotechnical locations with various combinations of static and dynamic loads. In this research, the elements of reservoir walls are first typed according to the performance analyzed; then the range of the membrane based on the thickness and the minimum and maximum cross sections of the bar used are determined in each element. This is done by considering the variable constraints, which are estimated by the maximum stress capacity. In the next phase, based on the reservoir analysis and using the algorithm of the PARIS connector, the related information is combined with the code for the PSO algorithm, i.e., an algorithm for a swarming search, to determine the optimum thickness of the cross sections for the reservoir membrane’s elements and the optimum cross section of the bar used. Based on very complex mathematical linear models for the correct embedding and angles related to achain of peripheral strengthening membranes, which optimize the vibration of the structure, a mutual relation is selected between the modeling software and the code for a particle swarm optimization algorithm. Finally, the comparative weight of the concrete reservoir optimized by the peripheral strengthening membrane is analyzed using common methods. This analysis shows a 19% decrease in the bar’s weight, a 20% decrease in the concrete’s weight, and a minimum 13% saving in construction costs according to the items of a checklist for a concrete reservoir at 10,000 m3.