Girdner K.,ARCO Co.
Environmental and Engineering Geoscience | Year: 2011
A method to model compartmentalized groundwater systems is described. The method is based on the evaluation of a data set of pore pressure measurements from vibrating wire piezometers and open standpipe piezometers. Measurements were obtained from an area of approximately 5 mi 2 (13 km 2). The method was developed in light of the prohibitive cost of installing instruments in each of the approximately 300 groundwater compartments in the study area. Modeling pore pressure across the groundwater compartments is accomplished through the use of reliability methods that account for the range of pore pressures by elevation and material type. The method is most applicable for modeling extensive, highly compartmentalized groundwater systems in heterogeneous material types. As the method relies solely on pore pressure measurements and does not take into account pumping rates, boundary conditions, aquifer characteristics, or other aspects for modeling a transient system, only limited forward projection of the pore pressure distribution is possible. Source
Suruki R.Y.,ARCO Co. |
Boudiaf N.,GSK |
World Allergy Organization Journal | Year: 2016
Background: Asthma is the most common chronic disease in childhood and places a significant burden on public and private health systems. This retrospective cohort analysis utilised administrative healthcare claims data (US Clinformatics™ Multiplan database; compliant with the US Department of Health & Human Services Health Insurance Portability and Accountability Act) to characterise asthma exacerbations requiring intervention in a US paediatric patient population. Methods: Patients aged > 1-17 years with a recorded asthma diagnosis and receiving treatment were identified in the US Clinformatics™ Multiplan database over a 9-year period (2004-2012). Both incident and prevalent cases of asthma were included, with the most recently recorded asthma diagnosis designated as the index date. The 12-month period following the index date was analysed for asthma exacerbations, defined as an event requiring treatment with systemic corticosteroid or resulting in an asthma-related hospitalisation or emergency department visit. Results: Data from 734,114 children with asthma (41.5 % females, 58.5 % males) were analysed, of this cohort 34.4 % experienced ≥ 1 exacerbation during the follow-up period. The proportion who experienced ≥ 1 exacerbation increased from 28.9 % in 2004 to 36.3 % in 2012, based on the reported index date. Their mean annual exacerbation frequency was 1.4; 85.8 % of exacerbations were defined by systemic corticosteroids use. A consistent trend of increased exacerbation incidence in the fall and early winter was observed, in particular exacerbations defined by systemic corticosteroid use. A greater proportion of asthma-related hospitalisations were associated with younger age. Conclusions: Approximately one-third of children experienced ≥ 1 exacerbation in real-world clinical practice. A targeted treatment approach with a focus on those with a history of recurrent exacerbations is recommended to improve asthma control. This targeted approach could also minimise the frequent systemic corticosteroid exposure particularly at an early age when side effects of systemic corticosteroids are more pronounced. © 2016 Suruki et al. Source
Johnson E.S.,Weidlinger Asso. Inc. |
Meissner J.E.,ARCO Co. |
Fahnestock L.A.,University of Illinois at Urbana - Champaign
Journal of Structural Engineering (United States) | Year: 2016
A half-scale three-bay by three-bay steel-concrete composite floor system, which represented gravity framing for a typical commercial building, was studied experimentally to evaluate its structural integrity under four separate column removal scenarios: a corner column, two edge columns, and an interior column. In each test, the load was incrementally applied in the bays that were tributary to the removed column using water in containers that were placed on top of the slab. The tests demonstrated that gravity systems for commercial buildings have a significant level of structural integrity - compared to the load redistribution capability expected for steel framing with simple shear connections - even without specific design against progressive collapse. In the corner and edge column removal scenarios, 2.9 kPa (60 psf) and 4.0 kPa (83 psf) were sustained, respectively, and these loads represent a range of 50-75% of the expected floor load. The interior column removal scenario had an unexpectedly low capacity of 3.2 kPa (67 psf), but the behavior was heavily affected by damage to the test specimen due to the previous edge column removal scenarios. For this interior column removal scenario, the lack of slab continuity at the interior edges of the loaded bays prevented composite action and load redistribution occurred primarily through tension ties. Although tension tie development was observed in this experimental program, composite flexural response also had an important contribution to load redistribution for the corner and edge column removal scenarios. Despite the load redistribution seen in these tests, the observed capacities are below the extreme event load combination that is commonly used when designing to prevent progressive collapse, so the current design practice for steel gravity framing is likely not sufficient to meet this criterion. © 2015 American Society of Civil Engineers. Source
McLaughlin J.,ARCO Co.
Textile Rental | Year: 2010
Jason McLaughlin focuses on the Leadership in Energy & Environmental Design (LEED) Certification and how sustainable construction methods enhance competitiveness by saving energy and improving public image. The US Green Building Council (USGBC) created a road map for achieving substantial reductions in energy use. The LEED rating system awards points for incorporating various environmentally friendly designs such as reducing potable water use by 30%, diverting construction debris to a recycling facility instead of a landfill, or increasing the amount of natural lighting throughout the building. The LEED rating system focuses on six major areas, namely site selection, water efficiency, energy and atmosphere, and Materials & Resources Indoor Environmental Quality Innovation and Design Process. The energy and atmospheric aspects of LEED concentrate on reducing the amount of electricity used in the building. A varying number of points are awarded, depending on the percentage of reduction attained. Source
Roche J.,ARCO Co.
Textile Rental | Year: 2010
Most laundry operators are advised to take the easiest step toward savings via lighting retrofits which pay back within two years. A 70,000 square-foot laundry could save over $30,000 over the next 10 years by implementing a T-5 lighting retrofit, coupled with EPAct (Energy and Policy Act of 2005). EPAct is a federally approved amendment to the 1986 Internal Revenue Code (section 179D) that provides a one-time federal tax deduction for improvements in energy efficiency to commercial buildings. The full EPAct benefits apply to three parts of the building's non- process-related energy consumption: Building envelope namely, walls, roof, floor and interior lighting and building HVAC systems. The EPAct allows any lighting retrofit performed from 2005 until December 31, 2013, to qualify for a one-time tax deduction for up to $0.60/square foot. Motion sensors in warehousing facilities, can cut lighting costs by over 50%. Source