Session B6- Installation of Denil fishways and eel ladders at brownfield sites

EA Engineering, Science, and Technology, Inc., the U.S. Department of Agriculture Natural Resources Conservation Service, and the Woonasquatucket River Watershed Council have successfully designed, permitted, and constructed Denil fishways and eel ladders at the Rising Sun Mills and Atlantic Mills Dams, the first and third dams on the Woonasquatucket River, a federally designated American Heritage River. The Woonasquatucket River has a number of low head dams from former industrial uses that prevent passage of diadromous fish. The fish ways at these two dams, combined with the two dam removals at Paragon Mills and Dyerville Dams, thesecond and fourth dams, opened over linear miles and 150 acres of habitat to diadromous fish, including American shad, blueback herring, alewife, and American eel. Providing fish passage at these two urban river settings presented numerous engineering and permitting challenges to address historical and archaeological considerations, contaminated sediment management, and state and federal regulatory requirements. Rising Sun Mills Dam and Atlantic Mills Dam are located adjacent to capped Brownfield sites, and the Denil fishways had to be designed to maintain the integrity of the Brownfield caps. Both fish ways required modifications to the existing dam structures after installation of cofferdams to address unknown conditions. The Rising Sun Mills fish way required modification to the deteriorated timber gate for the fishway exit channel and stabilization of the timber spillwayapron for construction of the fishway entrance. The spillwayabutment at Atlantic Mills Dam was found unstable and had to be replaced with a new concrete abutment between the spillway and the fishway exit channel. Both projects included design and installation of eel fish ways subsequent to completion of the Denil fishways. Solar panels were used to operate the attraction water pumps since there were no nearby power sources

Mitigating Wind Induced Truck Crashes

Dangerous weather and high wind in particular, is a common contributing factor in truck crashes. High wind speeds have been documented as a perennial cause of truck crashes in Kansas and other Great Plains states. The possibility of reducing such crashes, combined with the installation of dynamic message signs along Interstate 70, created an opportunity for further research. To this end, crash data were obtained from the Kansas Department of Transportation’s Accident Records System for all heavy vehicle crashes on I-70 that involved strong winds. The data were analyzed to determine the correlations between the vehicle and freight characteristics, crash occurrences and weather conditions. The goal of this analysis was to construct a model that could predict the likelihood of such wind-induced truck crashes. Ideally, this model could furnish officials with a framework for preempting such crashes by imposing highway usage restrictions; thereby increasing safety for both truck drivers and the traveling public. After regressing the data into a model, however, it was found that wind speed was not a statistically significant factor in predicting such crashes. This finding agrees with some of the other literature on the subject and can be attributed to drivers altering their behavior as wind speeds change. From this research, we identified a dilemma zone of wind speeds in which drivers may not be making such a behavioral change. Furthermore, specific corridors in Kansas are identified as potential areas for the implementation of a warning system. It is recommended that Dynamic Message Signs be tied to weather data stations and/or lighted wind socks be installed on selected overpass bridges

Manchester tap water ranks in top 5 nationally for water taste

News release announcing that Manchester\u27s tap water placed in the top 5 for best tasting tap water at the American Water Works Annual Conference, 2011

New civil engineering program criteria: The rest of the story

The American Society of Civil Engineers (ASCE) organized the Civil Engineering Program Criteria Task Committee in October 2012 whose charge is to determine if the current ABET Civil Engineering Program Criteria (CEPC) should be changed to reflect one or more of the 24 outcomes of the second edition of the Civil Engineering Body of Knowledge published in 2008. After two years of work, a proposed CEPC has been approved by the relevant ASCE committees and forwarded to ABET for approval and incorporation into accreditation criteria. A paper chronicling the committee’s efforts through a review of the literature, the committee’s methodology and process, and the key issues that emerged was presented at the 2014 ASEE Annual Conference in Indianapolis. This paper updates that effort by presenting the resulting proposed criteria, the changes generated by constituency feedback, progress on the Commentary, the existing gap between the proposed accreditation criteria and the current body of knowledge, and the future work of the committee

Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts

We present new results of the ``0.7'' 2(e^2)/h structure or quasi plateau in some of the most strongly confined point contacts so far reported. This strong confinement is obtained by a combination of shallow etching and metal gate deposition on modulation doped GaAs/GaAlAs heterostructures. The resulting subband separations are up to 20 meV, and as a consequence the quantized conductance can be followed at temperatures up to 30 K, an order of magnitude higher than in conventional split gate devices. We observe pronounced quasi plateaus at several of the lowest conductance steps all the way from their formation around 1 K to 30 K, where the entire conductance quantization is smeared out thermally. We study the deviation of the conductance from ideal integer quantization as a function of temperature, and we find an activated behavior, exp(-T_a/T), with a density dependent activation temperature T_a of the order of 2 K. We analyze our results in terms of a simple theoretical model involving scattering against plasmons in the constriction.Comment: RevTex (4 pages) including 2 postscript figures. To appear in Physica B, 199

Accreditation insights and the next body of knowledge

The American Society of Civil Engineers (ASCE) published the second edition of the Civil Engineering Body of Knowledge (BOK2) in 2008 expanding the knowledge, skills and attitudes required of future civil engineers. There were major changes to the BOK2 as the number of expected outcomes increased from 15 to 24 and the cognitive level of attainment was more precisely defined. A major implementation and enforcement mechanism for the BOK is the ABET accreditation criteria which includes both general criteria 3 and 5 and the discipline-specific program criteria. Of those, the program criteria are the easiest to change. In 2013, ASCE created the Civil Engineering Program Criteria Task Committee (CEPCTC) whose charge was to determine if the current CEPC should be changed to reflect an additional one or more of the 24 outcomes of BOK2. After two years of meetings, conference calls, draft criteria, constituency input, and associated revisions, a proposed change to the CEPC was approved by ASCE and submitted to ABET for approval. The CEPC was supplemented with an associated commentary. The proposed CEPC are currently going through the two-year ABET approval process and are expected to go into effect in September 2016. The results of the committee’s work were presented in papers at the 2014 and 2015 ASEE Annual Conferences in Indianapolis and Seattle.1,2 The Body of Knowledge is a living document that will continue to be updated and revised. ASCE has developed an eight year cycle of change that will make future iterations of the BOK and CEPC both systematic and predictable.3 As such, a Body of Knowledge Task Committee (BOKTC) is scheduled to be formed in October 2016. The BOKTC could recommend no revisions, minor revisions, or extensive revisions to BOK2. If substantive changes are recommended to BOK2, the master plan calls for the completion of the third edition of the Civil Engineering Body of Knowledge for the 21st Century (BOK3) before October 2018. Because the CEPC was created to be compatible with the BOK2 outcomes, the CEPCTC studied the BOK2 in depth. The BOK2 is an aspirational and visionary document which only partially accounts for the real-world constraints faced by engineering programs in terms of mandated maximum units in an undergraduate program and additional requirements imposed by a state government or a university. Conversely, the ABET accreditation criteria (general plus program) define the minimum requirements for a program to receive accreditation. There will naturally be a gap between those two standards. For the cycle of change to be successful, the insights and lessons learned from the development of the CEPC should be communicated with the BOKTC and vice versa. This paper attempts to do that. The paper will define the gap between (1) the BOK2 and (2) EAC/ABET accreditation criteria (general plus proposed CEPC) and make recommendations for closing the gap. During their work, the CEPCTC encountered issues with the BOK2 that suggest potential revisions for the BOK3. This paper is a mechanism for sharing CEPCTC insights, lessons learned, suggestions and recommendations with the rest of the academic and professional community

Strong contribution to octet baryon mass splittings

We calculate the $m_d-m_u$ contribution to the mass splittings in baryonic isospin multiplets using SU(3) chiral perturbation theory and lattice QCD. Fitting isospin-averaged perturbation theory functions to PACS-CS and QCDSF-UKQCD Collaboration lattice simulations of octet baryon masses, and using the physical light quark mass ratio $m_u/m_d$ as input, allows $M_n-M_p$, $M_{\Sigma^-}-M_{\Sigma^+}$ and $M_{\Xi^-}-M_{\Xi^0}$ to be evaluated from the full SU(3) theory. The resulting values for each mass splitting are consistent with the experimental values after allowing for electromagnetic corrections. In the case of the nucleon, we find $M_n-M_p= 2.9 \pm 0.4 \textrm{MeV}$, with the dominant uncertainty arising from the error in $m_u/m_d$

Probing deeper into the risks of slips, trips and falls for an ageing rail passenger population: applying a systems approach

In this study, the authors report the findings from a study of the contributory factors leading to slips, trips and falls (STFs) amongst elderly passengers at train stations and how these are likely to change in the future over the medium to long term (the period 2035–2050). Their data draws on: stakeholder interviews with rail personnel and elderly passengers; a set of station observations carried out across the UK; and, a survey of the views of station managers. The findings point to a set of 22 contributory factors covering aspects of organisational, station environment and passenger (individual) influence on STFs. Amongst the factors which most concern station managers at the present and over the next few decades are: rushing behaviour on train platforms; the consumption of alcohol by passengers; aspects of station design (e.g. flooring); and, training for station staff as regard the risks of STFs. The authors summarise their findings in the form of a systems model which highlights priorities with regard to STFs in terms of all of the stakeholders taking part in the study. A final section discusses a set of issues which might form the basis for a future agenda for research and practice in this area

Обзор детекторов гамма-излучения для контроля положения ствола горизонтальной скважины

Представлен обзор детекторов гамма-излучения и принципы их работы. Приведены основные характеристики счетчиков гамма-излучения. Отмечены основные достоинства и недостатки данных устройств. Выбран детектор для регистрации гамма-излучения в процессе горизонтального бурения нефтяных и газовых скважин