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Zhang C.,Bridge Engineer | Canning L.,Technical Manager
Proceedings of Institution of Civil Engineers: Construction Materials | Year: 2011

There has been growing interest in the use of non-conventional materials in the construction industry, and their introduction has presented both opportunities and challenges to researchers and engineers worldwide. This paper gives a brief overview of new and emerging materials in construction. The background to their introduction is introduced and discussed within the context of sustainable construction, with the significance of sustainable material selection highlighted. Attention is specifically drawn to the importance of considering both the cost and environmental implications when any new material is introduced into construction. The main barriers to application of new materials within the construction industry are discussed in detail with reference to the development of an advanced composite bridge decking system. Based on this, a successful model for conversion from academic excellence to commercial viability is suggested.

Crofts D.B.,RSK Environment Ltd | Jasko I.,Technical Manager | Mayers G.,Sandberg LLP
Proceedings of Institution of Civil Engineers: Construction Materials | Year: 2015

As part of the recent revision and update of Concrete Society Technical Report 32, a Concrete Society Working Group organised a laboratory trial in co-operation with 11 laboratories using their UK Accreditation Service-accredited methods for the chemical analysis of hardened concrete. The concrete samples were prepared by Hanson using four mixes, including variously CEM I, pulverised-fuel ash, ground granulated blast-furnace slag, insoluble and soluble aggregates as well as occasionally added chlorides. The findings of the trial were assessed in the second edition of Technical Report 32, which concluded that the trial had limitations but that the results raised concerns about the chemical methods in use. This briefing by three of the participants in the trial who were also members of the Working Group summarises some of its findings and outlines some positive suggestions to address the trial’s shortcomings, in order to allow a more realistic and helpful assessment of the methods that have been a vital tool for analysts and engineers for many decades. © 2015, Thomas Telford Services Ltd. All rights reserved.

Sugur N.V.,BVBCET | Siddamal S.V.,BVBCET | Vemala S.S.,Technical Manager
Proceedings of the IEEE International Conference on VLSI Design | Year: 2014

This paper presents a high throughput (1Gbps) and moderate area for constraint length K=3, code rate R=1/2 and four states (N=4) hard decision state parallel Viterbi decoder. The Add Compare Select (ACS) unit in path metric unit is designed to reduce the latency of ACS loop delay by using Modified Carry Look Ahead Adder and Digital Comparator. We also consider the design of Survivor Memory Unit (SMU) which combines the advantages of both Register Exchange method and Trace Back method, to reduce the decoding latency and total area of the Viterbi decoder. The proposed Viterbi decoder design is described using Verilog HDL and implemented in standard cell ASIC flow using Synopsys EDA tool. The design operation is verified by decoding the one million bits. The behavior of the decoder is verified by using Synopsys simulator and synthesized using Synopsys Design Compiler in 65nm CMOS technology library. The proposed decoder operates at 250MHz, supply voltage 1.32V and operating temperature range -40°C to 125°C. The ACS architecture achieves 67.07% improvement in reduction of latency compared to the conventional ACS architecture and achieves 1.235 Gbps throughput. The results show that, the Viterbi decoder architecture achieves 73.03% to 92.46% improvement in area as compared to the other architectures. This reduction in latency and area finds application in high data rate communication. © 2014 IEEE.

Florescu D.,Science Hidroelectrica SA | Popa F.,Technical Manager | Popa B.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2015

There are not so many references regarding the systemic approach of a small hydropower plant behavior between the resource and energy produced and commercial operation; maybe due to the fact that the problem became important just lately, the commercial relevance of the operation being considered only after the restructure of the energetic system, the emergence of energy markets and private investment in the field. This is the reason why a software which allows to determine the hourly production of energy for the next day is extremely important for the operator of a small hydropower plant. The paper presents the mathematical model of such a program, the necessary data and the results for a study case. © 2009 Universitatea Politehnica Bucuresti.

News Article | January 22, 2016
Site: cleantechnica.com

Companies partaking in the RE100 campaign are, on average, halfway towards meeting their 100% renewable electricity goals. This, according to the new RE100 annual report published by The Climate Group and CDP this week, which publishes the latest available data (which is from 2014) on 45 companies partaking in the RE100 campaign to commit to 100% renewable electricity. Specifically, the report shows that the retail sector of RE100 companies have switched over 10 GW to renewables, while those in the ICT sector are on average 64% of the way towards their 100% electricity goals. The RE100 campaign predicts that its current group of 53 RE100 companies will reach an average of 80% renewable electricity by 2020. “The good news is that RE100 companies in every sector have made progress towards their 100% goals – or in some cases, have already got there,” said Emily Farnworth, RE100 Campaign Director at The Climate Group. “The companies that have been able to make the switch more easily are those with smaller power requirements operating mainly in the US or Europe – where renewable electricity options are most readily accessible. The report also identified a trend in IT companies that are building research labs and data centers and relying on Power Purchase Agreements and on-site generation. Many European companies are also making the most of opportunities to use Power Purchase Agreements for renewable energy directly from the grid. “This report shows us that business corporations around the world are stepping up in making commitments to renewable energy and working with RE100 to drive forward a global market for renewable energy,” said Roberto Zanchi, Technical Manager, Renewable Energy at CDP. “By reporting to CDP on their transition to clean energy and the sharing of best practices, RE100 companies are demonstrating strong transparency and accountability which are essential in developing a vibrant, well-functioning market.” The RE100 campaign has its own goals as well, and is planning the following tasks moving forward:   Get CleanTechnica’s 1st (completely free) electric car report → “Electric Cars: What Early Adopters & First Followers Want.”   Come attend CleanTechnica’s 1st “Cleantech Revolution Tour” event → in Berlin, Germany, April 9–10.   Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.  

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