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Quality control and quality assurance manual for the determination of volatile organic contaminants
Title
Quality control and quality assurance manual for the determination of volatile organic contaminants.
Creator
Wang, Tsen C.
Date Issued
1990-09
PURL
http://purl.flvc.org/fcla/dt/3359103
Subject Headings
Quality control, Quality assurance, Volatile organic compounds
Format
Document (PDF)
Development of an Innovative Daily QA System for Pencil-Beam Scanning Proton Therapy
Title
Development of an Innovative Daily QA System for Pencil-Beam Scanning Proton Therapy.
Creator
Kassel, Maxwell, Shang, Charles, Muhammad, Wazir, Florida Atlantic University, Department of Physics, Charles E. Schmidt College of Science
Abstract/Description
In this work, we have developed a robust daily quality assurance (QA) system for pencil-beam scanning (PBS) dosimetry. A novel phantom and multi-PTV PBS plan were used in conjunction with the Sun Nuclear Daily QA3 multichamber detector array to verify output, range, and spot position. The sensitivity to detect change in these parameters with our designed tests was determined empirically. Associated tolerance levels were established based on these sensitivities and guidelines published in...
Show moreIn this work, we have developed a robust daily quality assurance (QA) system for pencil-beam scanning (PBS) dosimetry. A novel phantom and multi-PTV PBS plan were used in conjunction with the Sun Nuclear Daily QA3 multichamber detector array to verify output, range, and spot position. The sensitivity to detect change in these parameters with our designed tests was determined empirically. Associated tolerance levels were established based on these sensitivities and guidelines published in recent American Association of Physics in Medicine (AAPM) task group reports. The output has remained within the 3% tolerance and the range was within ±1mm. Spot position has remained within ±2mm. This daily QA procedure is quick and efficient with the time required for setup and delivery at less than 10 minutes.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013623
Subject Headings
Proton Therapy, Radiation dosimetry, Quality assurance
Format
Document (PDF)
enhanced model for measuring service quality
Title
An enhanced model for measuring service quality.
Creator
Jagannathan, Venkatakrishnan., Florida Atlantic University, Shaw, Eric H.
Abstract/Description
Three models have been proposed to measure service quality in the marketing literature. These models are: (1) Perception minus Expectations (P-E) Model, (2) Ideal Point (IP) Model, and (3) Performance-based (P-based) model. Underlying the models are two types of attributes: (a) vector point attributes (in the P-E and P-based models), and (b) ideal point attributes (in the IP model). With vector point attributes, increasing performance levels produce increased levels of favorable evaluation by...
Show moreThree models have been proposed to measure service quality in the marketing literature. These models are: (1) Perception minus Expectations (P-E) Model, (2) Ideal Point (IP) Model, and (3) Performance-based (P-based) model. Underlying the models are two types of attributes: (a) vector point attributes (in the P-E and P-based models), and (b) ideal point attributes (in the IP model). With vector point attributes, increasing performance levels produce increased levels of favorable evaluation by customers. With ideal point attributes, increased levels of performance produces favorable evaluation up to the ideal, but beyond the ideal further performance is unfavorably evaluated. This research extends the attribute typology by introducing a third type called the "threshold point attribute." Threshold point attributes are those where customers' evaluation are posited to be favorable when performance increases up to a threshold point. Beyond the threshold point increases in performance are not accompanied by incremental increases in favorable evaluation (as with vector attributes), nor do they turn negative (as with ideal point attributes). That is, the marginal change in evaluation (whether an increase or decrease) is zero after the threshold level. In addition to extending the attribute typology, this research also proposes an enhanced model which subsumes vector, ideal and threshold point attributes. Because of its inclusiveness, the enhanced model is hypothesized to better represent the construct of service quality than the P-E, IP, and P-based models. A survey was mailed to 4,975 customers of an internationally known service firm. Results of a piecewise regression analysis on the data show that threshold point attributes exist in services. The enhanced model, however, does not perform better than other models in criterion and construct validity tests. One significant implication for managers is that they can avoid expenditures on features that customers do not desire beyond a threshold level. The most important direction for future research is to develop and test a contingency theory of customers' attribute classifications.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/12486
Subject Headings
Customer services--Research, Marketing research, Consumer behavior--Research, Quality assurance
Format
Document (PDF)