The Experts below are selected from a list of 21177 Experts worldwide ranked by ideXlab platform
Leslie K Norford - One of the best experts on this subject based on the ideXlab platform.
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demonstration of hvac chiller control for power grid frequency regulation part 2 discussion of results and considerations for broader deployment
Science and Technology for the Built Environment, 2015Co-Authors: Leslie K NorfordAbstract:Secondary frequency regulation is an electric grid ancillary service that balances the electric power system supply and demand on short time intervals. A companion article (Su and Norford 2015) developed and experimentally demonstrated a practical controller to modify chiller power demand to provide secondary frequency regulation with sufficient performance to meet market Qualification Requirements. This article compares experimental results to model predictions and to other sources of secondary frequency regulation. Delay time, ramp-rate limits, minimum power, and variable coefficient of performance are identified as factors that contribute to chiller power transient behavior and should be considered when predicting performance. This article additionally introduces results from a second building to assess the applicability of similar chiller control strategies for other HVAC systems. The second building produced less positive results due to communication delays associated with a modified setup and due to...
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demonstration of hvac chiller control for power grid frequency regulation part 1 controller development and experimental results
Science and Technology for the Built Environment, 2015Co-Authors: Leslie K NorfordAbstract:Secondary frequency regulation is a necessary electric grid ancillary service that balances electric power system supply and demand on short time intervals of seconds to minutes. HVAC chillers may be well positioned to provide secondary frequency regulation as a demand side resource. This article describes the experimental development and performance of a practical controller that modifies chiller power demand to provide secondary frequency regulation. Chiller characteristics are identified through testing of a 200-ton (703-kWth) chiller serving a commercial building in Boston. Appropriate control strategies are subsequently determined. Controller demonstrations using standard electric system operator test routines show the chiller power response to exceed Qualification Requirements while providing up to ±25% of chiller nameplate power in secondary frequency regulation capability. The controller is further demonstrated to provide secondary frequency regulation continuously for several hours, during which ...
Chu H Wang - One of the best experts on this subject based on the ideXlab platform.
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a review of toroidal composite pressure vessel optimisation and damage tolerant design for high pressure gaseous fuel storage
International Journal of Hydrogen Energy, 2016Co-Authors: Calum P Fowle, Adria C Orifici, Chu H WangAbstract:On-board high-pressure storage of hydrogen gas and compressed natural gas is critical to the widespread adoption of alternative gaseous fuel to reduce CO2 emissions in transportation. Cylindrical pressure vessels are the traditional option for on-board gaseous fuel storage; however they possess domed heads that are prone to over-design and a source of manufacturing difficulties. Toroidal composite pressure vessels (CPV) have been recognised as a volumetrically efficient solution that could address these problems, thus reducing vessel mass, while improving storage efficiencies. Currently, there exist many gaps in toroidal CPV research which must be addressed to fully realise the potential of this technology. Herein we present a comprehensive and critical review of the design and optimisation of toroidal CPVs, focussing on damage tolerant design as a key requirement to meet safety standards and optimisation of toroidal cross-sectional profiles (shape, thickness variation and fibre winding pattern) to reduce or eliminate stress non-uniformity. An original analysis of toroidal radius ratio (R/r) influence on the thickness profiles of naturally-thickened and isotensoid circular toroidal CPVs is conducted. It is concluded that a focus on smaller radius ratios (1.25 < R/r < 3) is required to maximise the potential space-saving and volumetric efficiencies of the torus. Leading international CPV standards are analysed in order to adapt three important design Qualification Requirements from cylindrical to toroidal structures. Building block approaches are also presented to aid the damage tolerant design of toroidal CPVs for the relevant design Qualification tests.
David H. Mckenna - One of the best experts on this subject based on the ideXlab platform.
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Establishment of an unrelated umbilical cord blood bank Qualification program: ensuring quality while meeting Food and Drug Administration vendor Qualification Requirements.
Transfusion, 2013Co-Authors: Fran Rabe, Diane Kadidlo, Lisa Van Orsow, David H. MckennaAbstract:Background Qualification of a cord blood bank (CBB) is a complex process that includes evaluation of multiple aspects of donor screening and testing, processing, accreditation and approval by professional cell therapy groups, and results of received cord blood units. The University of Minnesota Medical Center Cell Therapy Laboratory has established a CBB vendor Qualification process to ensure the CBB meets established regulatory and quality Requirements. Study Design and Methods The deployed Qualification of CBBs is based on retrospective and prospective review of the CBB. Results Forty-one CBBs were evaluated retrospectively: seven CBBs were disqualified based on failed quality control (QC) results. Eight CBBs did not meet the criteria for retrospective Qualification because fewer than 3 cord blood units were received and the CBB was not accredited. As of March 2012, three US and one non-US CBBs have been qualified prospectively. One CBB withdrew from the Qualification process after successful completion of the comprehensive survey and subsequent failure of the provided QC unit to pass the minimum criteria. One CBB failed the prospective Qualification process based on processing methods that were revealed during the paper portion of the evaluation. Conclusions A CBB Qualification process is necessary for a transplant center to manage the Qualification of the large number of CBBs needed to support a umbilical cord blood transplantation program. A transplant center that has utilized cord blood for a number of years before implementation of a Qualification process should use a retrospective Qualification process along with a prospective process.
Teuer Tomáš - One of the best experts on this subject based on the ideXlab platform.
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Qualification of welding procedure for cobalt plus heat-resistant stainless steel alloys
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018Co-Authors: Teuer TomášAbstract:This thesis deals with the welding of heterogeneous materials, namely cobalt and heat-resistant stainless steel alloys refractory GTAW (WIG). The main objective is to develop a preliminary specification of the pWPS welding procedure for a particular component and its subsequent Qualification of the WPQR welding process. Furthermore it is necessary to set Requirements of mechanical testing and differences for Qualification Requirements according to EN ISO 15613 for this welding component
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Qualification of welding procedure for cobalt plus heat-resistant stainless steel alloys
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018Co-Authors: Teuer TomášAbstract:Tato práce se zabývá problematikou svařování heterogenních materiálů, konkrétně kobaltových a nerezových žáruvzdorných slitin metodou GTAW (WIG). Hlavním cílem je vypracovat předběžnou specifikaci postupu svařování pWPS pro konkrétní součást a její následnou kvalifikaci postupu svařování WPQR. Dále je pro tuto svařovanou součást potřeba stanovit požadavky na mechanické zkoušení a rozdíly pro potřeby kvalifikace dle EN ISO 15613.This thesis deals with the welding of heterogeneous materials, namely cobalt and heat-resistant stainless steel alloys refractory GTAW (WIG). The main objective is to develop a preliminary specification of the pWPS welding procedure for a particular component and its subsequent Qualification of the WPQR welding process. Furthermore it is necessary to set Requirements of mechanical testing and differences for Qualification Requirements according to EN ISO 15613 for this welding component.
Jane Bellman - One of the best experts on this subject based on the ideXlab platform.
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public health nutrition practice in canada a situational assessment
Public Health Nutrition, 2008Co-Authors: Ann Fox, Cathy Chenhall, Marie Traynor, Cindy Scythes, Jane BellmanAbstract:Objective Renewed focus on public health has brought about considerable interest in workforce development among public health nutrition professionals in Canada. The present article describes a situational assessment of public health nutrition practice in Canada that will be used to guide future workforce development efforts. Methods A situational assessment is a planning approach that considers strengths and opportunities as well as needs and challenges, and emphasizes stakeholder participation. This situational assessment consisted of four components: a systematic review of literature on public health nutrition workforce issues; key informant interviews; a PEEST (political, economic, environmental, social, technological) factor analysis; and a consensus meeting. Findings Information gathered from these sources identified key nutrition and health concerns of the population; the need to define public health nutrition practice, roles and functions; demand for increased training, education and leadership opportunities; inconsistent Qualification Requirements across the country; and the desire for a common vision among practitioners. Conclusions Findings of the situational assessment were used to create a three-year public health nutrition workforce development strategy. Specific objectives of the strategy are to define public health nutrition practice in Canada, develop competencies, collaborate with other disciplines, and begin to establish a new professional group or leadership structure to promote and enhance public health nutrition practice. The process of conducting the situational assessment not only provided valuable information for planning purposes, but also served as an effective mechanism for engaging stakeholders and building consensus.
