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Sample records for quality control method

  1. Quality Control Guidelines for SAM Biotoxin Methods

    Science.gov (United States)

    Learn more about quality control guidelines and recommendations for the analysis of samples using the pathogen methods listed in EPA's Selected Analytical Methods for Environmental Remediation and Recovery (SAM).

  2. Quality Control Guidelines for SAM Radiochemical Methods

    Science.gov (United States)

    Learn more about quality control guidelines and recommendations for the analysis of samples using the radiochemistry methods listed in EPA's Selected Analytical Methods for Environmental Remediation and Recovery (SAM).

  3. Quality Control Guidelines for SAM Pathogen Methods

    Science.gov (United States)

    Learn more about quality control guidelines and recommendations for the analysis of samples using the biotoxin methods listed in EPA's Selected Analytical Methods for Environmental Remediation and Recovery (SAM).

  4. Quality Control Guidelines for SAM Chemical Methods

    Science.gov (United States)

    Learn more about quality control guidelines and recommendations for the analysis of samples using the chemistry methods listed in EPA's Selected Analytical Methods for Environmental Remediation and Recovery (SAM).

  5. Developing methods of controlling quality costs

    OpenAIRE

    Gorbunova A. V.; Maximova O. N.; Ekova V. A.

    2017-01-01

    The article examines issues of managing quality costs, problems of applying economic methods of quality control, implementation of progressive methods of quality costs management in enterprises with the view of improving the efficiency of their evaluation and analysis. With the aim of increasing the effectiveness of the cost management mechanism, authors introduce controlling as a tool of deviation analysis from the standpoint of the process approach. A list of processes and corresponding eva...

  6. Developing methods of controlling quality costs

    Directory of Open Access Journals (Sweden)

    Gorbunova A. V.

    2017-01-01

    Full Text Available The article examines issues of managing quality costs, problems of applying economic methods of quality control, implementation of progressive methods of quality costs management in enterprises with the view of improving the efficiency of their evaluation and analysis. With the aim of increasing the effectiveness of the cost management mechanism, authors introduce controlling as a tool of deviation analysis from the standpoint of the process approach. A list of processes and corresponding evaluation criteria in the quality management system of enterprises is introduced. Authors also introduce the method of controlling quality costs and propose it for the practical application, which allows them to determine useful and unnecessary costs at the existing operating plant. Implementing the proposed recommendations in the system of cost management at an enterprise will allow to improve productivity of processes operating and reduce wasted expense on the quality of the process on the basis of determining values of useful and useless costs of quality according to criteria of processes functioning in the system of quality management.

  7. Materials, methods and quality control, ch. 3

    International Nuclear Information System (INIS)

    Vader, H.L.

    1978-01-01

    A description of the chemical reagents, the 125 I-labelled angiotensin I, the antiserum and the standards is given. A modified measuring method with the New England Nuclear kit for angiotensin I radioimmunoassay is presented as well as the quality control data

  8. Water quality control system and water quality control method

    International Nuclear Information System (INIS)

    Itsumi, Sachio; Ichikawa, Nagayoshi; Uruma, Hiroshi; Yamada, Kazuya; Seki, Shuji

    1998-01-01

    In the water quality control system of the present invention, portions in contact with water comprise a metal material having a controlled content of iron or chromium, and the chromium content on the surface is increased than that of mother material in a state where compression stresses remain on the surface by mechanical polishing to form an uniform corrosion resistant coating film. In addition, equipments and/or pipelines to which a material controlling corrosion potential stably is applied on the surface are used. There are disposed a cleaning device made of a material less forming impurities, and detecting intrusion of impurities and removing them selectively depending on chemical species and/or a cleaning device for recovering drain from various kinds of equipment to feedwater, connecting a feedwater pipeline and a condensate pipeline and removing impurities and corrosion products. Then, water can be kept to neutral purified water, and the concentrations of oxygen and hydrogen in water are controlled within an optimum range to suppress occurrence of corrosion products. (N.H.)

  9. General Quality Control (QC) Guidelines for SAM Methods

    Science.gov (United States)

    Learn more about quality control guidelines and recommendations for the analysis of samples using the methods listed in EPA's Selected Analytical Methods for Environmental Remediation and Recovery (SAM).

  10. Internal quality control of RIA with Tonks error calculation method

    International Nuclear Information System (INIS)

    Chen Xiaodong

    1996-01-01

    According to the methodology feature of RIA, an internal quality control chart with Tonks error calculation method which is suitable for RIA is designed. The quality control chart defines the value of the allowance error with normal reference range. The method has the simplicity of its performance and directly perceived through the senses. Taking the example of determining T 3 and T 4 , the calculation of allowance error, drawing of quality control chart and the analysis of result are introduced

  11. METHODS OF AUTOMATIC QUALITY CONTROL OF AGGLUTINANTSANDS IN FOUNDRY

    Directory of Open Access Journals (Sweden)

    D. M. Kukuj

    2004-01-01

    Full Text Available The article is dedicated to comparative analysis of the well-known methods of automatic quality control of agglutinant sands in process of their preparation and to the problems of automation control of the mix preparation processes.

  12. Analytic Methods Used in Quality Control in a Compounding Pharmacy.

    Science.gov (United States)

    Allen, Loyd V

    2017-01-01

    Analytical testing will no doubt become a more important part of pharmaceutical compounding as the public and regulatory agencies demand increasing documentation of the quality of compounded preparations. Compounding pharmacists must decide what types of testing and what amount of testing to include in their quality-control programs, and whether testing should be done in-house or outsourced. Like pharmaceutical compounding, analytical testing should be performed only by those who are appropriately trained and qualified. This article discusses the analytical methods that are used in quality control in a compounding pharmacy. Copyright© by International Journal of Pharmaceutical Compounding, Inc.

  13. Advanced methods of quality control in nuclear fuel fabrication

    International Nuclear Information System (INIS)

    Onoufriev, Vladimir

    2004-01-01

    Under pressure of current economic and electricity market situation utilities implement more demanding fuel utilization schemes including higher burn ups and thermal rates, longer fuel cycles and usage of Mo fuel. Therefore, fuel vendors have recently initiated new R and D programmes aimed at improving fuel quality, design and materials to produce robust and reliable fuel. In the beginning of commercial fuel fabrication, emphasis was given to advancements in Quality Control/Quality Assurance related mainly to product itself. During recent years, emphasis was transferred to improvements in process control and to implementation of overall Total Quality Management (TQM) programmes. In the area of fuel quality control, statistical control methods are now widely implemented replacing 100% inspection. This evolution, some practical examples and IAEA activities are described in the paper. The paper presents major findings of the latest IAEA Technical Meetings (TMs) and training courses in the area with emphasis on information received at the TM and training course held in 1999 and other latest publications to provide an overview of new developments in process/quality control, their implementation and results obtained including new approaches to QC

  14. Improved Statistical Method For Hydrographic Climatic Records Quality Control

    Science.gov (United States)

    Gourrion, J.; Szekely, T.

    2016-02-01

    Climate research benefits from the continuous development of global in-situ hydrographic networks in the last decades. Apart from the increasing volume of observations available on a large range of temporal and spatial scales, a critical aspect concerns the ability to constantly improve the quality of the datasets. In the context of the Coriolis Dataset for ReAnalysis (CORA) version 4.2, a new quality control method based on a local comparison to historical extreme values ever observed is developed, implemented and validated. Temperature, salinity and potential density validity intervals are directly estimated from minimum and maximum values from an historical reference dataset, rather than from traditional mean and standard deviation estimates. Such an approach avoids strong statistical assumptions on the data distributions such as unimodality, absence of skewness and spatially homogeneous kurtosis. As a new feature, it also allows addressing simultaneously the two main objectives of a quality control strategy, i.e. maximizing the number of good detections while minimizing the number of false alarms. The reference dataset is presently built from the fusion of 1) all ARGO profiles up to early 2014, 2) 3 historical CTD datasets and 3) the Sea Mammals CTD profiles from the MEOP database. All datasets are extensively and manually quality controlled. In this communication, the latest method validation results are also presented. The method has been implemented in the latest version of the CORA dataset and will benefit to the next version of the Copernicus CMEMS dataset.

  15. Method of controlling the water quality in nuclear reactors

    International Nuclear Information System (INIS)

    Ibe, Hidefumi.

    1985-01-01

    Purpose: To obtain a simple and reliable water quality calculation system and water quality control method based thereon for the entire primary coolant circuits in BWR type reactors. Method: In a method of controlling the water quality of the reactor water by injecting hydrogen into the primary coolant circuits of a nuclear reactor, by utilizing a first linear relationship established between the concentration of oxygen and hydrogen in the main steam system and the concentration of radiolysis products in the reactor core and separators and mixing plenum portions, each of the above-mentioned concentrations is calculated from the concentrations for hydrogen or oxygen. Further, by utilizing the first linear relationship established between the concentrations for the oxygen and hydrogen in the recycling system and the concentration of the radiolysis products in the system from the downcomer to the lower plenum portion, the above-mentioned concentration is calculated from the concentration for oxygen and hydrogen. Then, the hydrogen injection rate into the primary coolant system is determined such that the calculated value takes an aimed value. (Ikeda, J.)

  16. Improved statistical method for temperature and salinity quality control

    Science.gov (United States)

    Gourrion, Jérôme; Szekely, Tanguy

    2017-04-01

    Climate research and Ocean monitoring benefit from the continuous development of global in-situ hydrographic networks in the last decades. Apart from the increasing volume of observations available on a large range of temporal and spatial scales, a critical aspect concerns the ability to constantly improve the quality of the datasets. In the context of the Coriolis Dataset for ReAnalysis (CORA) version 4.2, a new quality control method based on a local comparison to historical extreme values ever observed is developed, implemented and validated. Temperature, salinity and potential density validity intervals are directly estimated from minimum and maximum values from an historical reference dataset, rather than from traditional mean and standard deviation estimates. Such an approach avoids strong statistical assumptions on the data distributions such as unimodality, absence of skewness and spatially homogeneous kurtosis. As a new feature, it also allows addressing simultaneously the two main objectives of an automatic quality control strategy, i.e. maximizing the number of good detections while minimizing the number of false alarms. The reference dataset is presently built from the fusion of 1) all ARGO profiles up to late 2015, 2) 3 historical CTD datasets and 3) the Sea Mammals CTD profiles from the MEOP database. All datasets are extensively and manually quality controlled. In this communication, the latest method validation results are also presented. The method has already been implemented in the latest version of the delayed-time CMEMS in-situ dataset and will be deployed soon in the equivalent near-real time products.

  17. Watershed safety and quality control by safety threshold method

    Science.gov (United States)

    Da-Wei Tsai, David; Mengjung Chou, Caroline; Ramaraj, Rameshprabu; Liu, Wen-Cheng; Honglay Chen, Paris

    2014-05-01

    Taiwan was warned as one of the most dangerous countries by IPCC and the World Bank. In such an exceptional and perilous island, we would like to launch the strategic research of land-use management on the catastrophe prevention and environmental protection. This study used the watershed management by "Safety Threshold Method" to restore and to prevent the disasters and pollution on island. For the deluge prevention, this study applied the restoration strategy to reduce total runoff which was equilibrium to 59.4% of the infiltration each year. For the sediment management, safety threshold management could reduce the sediment below the equilibrium of the natural sediment cycle. In the water quality issues, the best strategies exhibited the significant total load reductions of 10% in carbon (BOD5), 15% in nitrogen (nitrate) and 9% in phosphorus (TP). We found out the water quality could meet the BOD target by the 50% peak reduction with management. All the simulations demonstrated the safety threshold method was helpful to control the loadings within the safe range of disasters and environmental quality. Moreover, from the historical data of whole island, the past deforestation policy and the mistake economic projects were the prime culprits. Consequently, this study showed a practical method to manage both the disasters and pollution in a watershed scale by the land-use management.

  18. Internal quality control of PCR-based genotyping methods

    DEFF Research Database (Denmark)

    Bladbjerg, Else-Marie; Gram, Jørgen; Jespersen, Jørgen

    2002-01-01

    Internal quality control programmes for genetic analyses are needed. We have focused on quality control aspects of selected polymorphism analyses used in thrombosis research. DNA was isolated from EDTA-blood (n = 500) and analysed for 18 polymorphisms by polymerase chain reaction (PCR), i...... because of positive reagent blanks (controls (Control of data handling revealed 0.1% reading mistakes and 0.5% entry mistakes. Based on our experiences, we propose an internal quality control programme......, electrophoresis (analytical factors), result reading and entry into a database (post-analytical factors). Furthermore, we evaluated a procedure for result confirmation. Isolated DNA was of good quality (42 micrograms/ml blood, A260/A280 ratio > 1.75, negative DNAsis tests). Occasionally, results were reanalysed...

  19. Methods for the Quality Control of Inactivated Poliovirus Vaccines.

    Science.gov (United States)

    Wilton, Thomas

    2016-01-01

    Inactivated poliovirus vaccine (IPV) plays an instrumental role in the Global Poliovirus Eradication Initiative (GPEI). The quality of IPV is controlled by assessment of the potency of vaccine batches. The potency of IPV can be assessed by both in vivo and in vitro methods. In vitro potency assessment is based upon the assessment of the quantity of the D-Antigen (D-Ag) units in an IPV. The D-Ag unit is used as a measure of potency as it is largely expressed on native infectious virions and is the protective immunogen. The most commonly used in vitro test is the indirect ELISA which is used to ensure consistency throughout production.A range of in vivo assays have been developed in monkeys, chicks, guinea pigs, mice, and rats to assess the potency of IPV. All are based on assessment of the neutralizing antibody titer within the sera of the respective animal model. The rat potency test has become the favored in vivo potency test as it shows minimal variation between laboratories and the antibody patterns of rats and humans are similar. With the development of transgenic mice expressing the human poliovirus receptor, immunization-challenge tests have been developed to assess the potency of IPVs. This chapter describes in detail the methodology of these three laboratory tests to assess the quality of IPVs.

  20. Statistical method for quality control in presence of measurement errors

    International Nuclear Information System (INIS)

    Lauer-Peccoud, M.R.

    1998-01-01

    In a quality inspection of a set of items where the measurements of values of a quality characteristic of the item are contaminated by random errors, one can take wrong decisions which are damageable to the quality. So of is important to control the risks in such a way that a final quality level is insured. We consider that an item is defective or not if the value G of its quality characteristic is larger or smaller than a given level g. We assume that, due to the lack of precision of the measurement instrument, the measurement M of this characteristic is expressed by ∫ (G) + ξ where f is an increasing function such that the value ∫ (g 0 ) is known and ξ is a random error with mean zero and given variance. First we study the problem of the determination of a critical measure m such that a specified quality target is reached after the classification of a lot of items where each item is accepted or rejected depending on whether its measurement is smaller or greater than m. Then we analyse the problem of testing the global quality of a lot from the measurements for a example of items taken from the lot. For these two kinds of problems and for different quality targets, we propose solutions emphasizing on the case where the function ∫ is linear and the error ξ and the variable G are Gaussian. Simulation results allow to appreciate the efficiency of the different considered control procedures and their robustness with respect to deviations from the assumptions used in the theoretical derivations. (author)

  1. QUALITY CONTROL OF HAWTHORN TINCTURE BY HPTLC METHOD

    Directory of Open Access Journals (Sweden)

    Khokhlova KO

    2016-09-01

    Full Text Available Introduction. Hawthorn tincture is one of the most used herbal drugs at the domestic pharmaceutical market. According to the State register of drugs at the pharmaceutical market of Ukraine, there are 13 commercial offers of Hawthorn tincture from home-produced manufactures. The initial herbal raw materials for Hawthorn tincture are Hawthorn fruits, which are widespread at the territory of Ukraine. These are pharmacopoeial herbal raw material. Thus, 12 different species of Hawthorn fruits are included into monograph of Ukrainian State Pharmacopoeia (SPhU and State Pharmacopoeia of USSR XI ed. On the territory of Ukraine there are near 30 different species of Hawthorn, and the quantity of species is much arises due to its forms and hybrids. The ‘natural variability’ of bioactive substances of Hawthorn fruits of the same species and possibility of usage of many different species during manufacturing process of herbal drugs lead to the pitfalls in standardization of herbal drugs in general, and Hawthorn tincture particularly, and should be taken in mind while development of its quality control methods. For development of specific and reproducible identification method, it is necessary to ensure the number of parameters: usage of method and equipment that give reproducible results; big selections of different samples; rigorously observation of method’s procedure of implementation. The modern, automated HPTLC method of analysis was chosen for identification purpose. If standardize procedure and suitable equipment are used, the reproducible results of the method have to be obtained. The aim of this paper was development of HPTLC method for identification of Hawthorn tincture, which could be appropriated for stability study and establishment of its expire date. Materials and Methods. In research 13 samples of Hawthorn tinctures from 8 manufactures from Ukraine and Russia were analyzed. These samples were manufactured in 2010, 2014, 2015 years. The

  2. Water quality control device and water quality control method for reactor primary coolant system

    International Nuclear Information System (INIS)

    Wada, Yoichi; Ibe, Eishi; Watanabe, Atsushi.

    1995-01-01

    The present invention is suitable for preventing defects due to corrosion of structural materials in a primary coolant system of a BWR type reactor. Namely, a concentration measuring means measures the concentration of oxidative ingredients contained in a reactor water. A reducing electrode is disposed along a reactor water flow channel in the primary coolant system and reduces the oxidative ingredients. A reducing counter electrode is disposed along the reactor water flow channel in the primary coolant system, and electrically connected to the reducing electrode. The reactor structural materials are used as a reference electrode providing a reference potential to the reducing electrode and the reducing counter electrode. A potential control means controls the potential of the reducing electrode relative to the reference potential based on the signals from the concentration measuring means. A stable reference potential in a region where an effective oxygen concentration is stable can be obtained irrespective of the change of operation conditions by using the reactor structural materials disposed to a boiling region in the reactor core as a reference electrode. As a result, the water quality can be controlled at high accuracy. (I.S.)

  3. Airtight miniaturized chromatography: a safer method for radiopharmaceutical quality control

    International Nuclear Information System (INIS)

    Coupal, J.J.; Shih, W.J.; Ryo, U.Y.

    1988-01-01

    Miniaturized chromatography is widely used for quality control of radiopharmaceuticals. Recently, published chromatography procedures have illustrated or described chromatography chambers open to the air in use, suggesting that volatile toxic mobile phases are harmless to people in the vicinity. The authors describe the results of their search for an inexpensive closed chromatography chamber that can be used to derive safely the benefits from conventional miniaturized chromatography

  4. Quality control methods in accelerometer data processing: identifying extreme counts.

    Directory of Open Access Journals (Sweden)

    Carly Rich

    Full Text Available Accelerometers are designed to measure plausible human activity, however extremely high count values (EHCV have been recorded in large-scale studies. Using population data, we develop methodological principles for establishing an EHCV threshold, propose a threshold to define EHCV in the ActiGraph GT1M, determine occurrences of EHCV in a large-scale study, identify device-specific error values, and investigate the influence of varying EHCV thresholds on daily vigorous PA (VPA.We estimated quantiles to analyse the distribution of all accelerometer positive count values obtained from 9005 seven-year old children participating in the UK Millennium Cohort Study. A threshold to identify EHCV was derived by differentiating the quantile function. Data were screened for device-specific error count values and EHCV, and a sensitivity analysis conducted to compare daily VPA estimates using three approaches to accounting for EHCV.Using our proposed threshold of ≥ 11,715 counts/minute to identify EHCV, we found that only 0.7% of all non-zero counts measured in MCS children were EHCV; in 99.7% of these children, EHCV comprised < 1% of total non-zero counts. Only 11 MCS children (0.12% of sample returned accelerometers that contained negative counts; out of 237 such values, 211 counts were equal to -32,768 in one child. The medians of daily minutes spent in VPA obtained without excluding EHCV, and when using a higher threshold (≥19,442 counts/minute were, respectively, 6.2% and 4.6% higher than when using our threshold (6.5 minutes; p<0.0001.Quality control processes should be undertaken during accelerometer fieldwork and prior to analysing data to identify monitors recording error values and EHCV. The proposed threshold will improve the validity of VPA estimates in children's studies using the ActiGraph GT1M by ensuring only plausible data are analysed. These methods can be applied to define appropriate EHCV thresholds for different accelerometer models.

  5. Nuclear analytical methods in quality control of microanalysis

    International Nuclear Information System (INIS)

    Tian Weizhi

    2004-01-01

    Quantitative calibration and quality control have been a major bottleneck in microanalysis due to the lack of natural-matrix CRMs certified at sample sizes compatible with those of unknown samples. A solution is described to characterize sampling behavior for individual elements, so as to identify elements homogeneous enough at stated sample size levels in given CRMs/RMs. By using a combination of several nuclear analytical techniques, INAA-EDXRF-μPIXE, sampling behavior for individual elements can be characterized at sample size levels from grams down to pg. Natural-matrix CRMs specifically for QC of microanalysis may thus be created. Additional information in certificates of these new generation CRMs is imagined. (author)

  6. High oleic sunflower biodiesel: quality control and different purification methods

    Directory of Open Access Journals (Sweden)

    Pighinelli, Anna L.M.T.

    2011-06-01

    Full Text Available The objective of the present work is to evaluate the production of biodiesel using ethanol and sunflower oil. The extraction of the sunflower oil was evaluated first. An experimental design was used to estimate the influence of the independent variables grain temperature (25º to 110ºC and expeller rotation (85 to 119rpm on the crude oil. The best result obtained was 68.38%, achieved with a rotation from 100 to 115rpm, grain temperature ranging from 25º to 30ºC and moisture content of around 7%. The next study consisted of transesterification, evaluating the influence of the ethanol, oil molar ratio and the catalyst concentration (sodium methylate on the ester-rich phase yield. The highest yield was 98.39% obtained with a molar ratio of 9:1 and 3% catalyst. An experiment was then carried out on a small reactor and the biodiesel produced was purified by three different methods: acidified water, silica and distillation. The quality aspects of the purified biodiesel samples were evaluated according to the Brazilian specifications for biodiesel, and distillation was shown to be the best method of purification.

    El objetivo del presente trabajo es evaluar la producción de biodiesel usando etanol y aceite de girasol. La extracción del aceite de girasol fue evaluada primero. Un diseño experimental fue usado para estimar la influencia de las variables independientes: temperatura del grano (25º a 110ºC y rotación del expeller (85 a 119 rpm en la obtención del aceite crudo. El mejor resultado obtenido fue un 68,38%, conseguido con una rotación de 100 a 115 rpm, una temperatura del grano de 25º a 30ºC y un contenido de humedad de alrededor del 7%. El siguiente estudio mediante transesterificación, evaluó la influencia de la relación molar etanol: aceite y concentración de catalizador (metilato sódico en el rendimiento de la fase rica en esteres. El rendimiento más alto fue 98,39% obtenido con una relación molar de 9.1 y 3% de

  7. Systems and methods for data quality control and cleansing

    Science.gov (United States)

    Wenzel, Michael; Boettcher, Andrew; Drees, Kirk; Kummer, James

    2016-05-31

    A method for detecting and cleansing suspect building automation system data is shown and described. The method includes using processing electronics to automatically determine which of a plurality of error detectors and which of a plurality of data cleansers to use with building automation system data. The method further includes using processing electronics to automatically detect errors in the data and cleanse the data using a subset of the error detectors and a subset of the cleansers.

  8. A simple method for the quality control of [F-18]FDG

    DEFF Research Database (Denmark)

    Koziorowski, J.

    2010-01-01

    Most automated synthesis modules produce [F-18]FDG within half an hour, but the quality control involving up to three separate methods and three different analytical systems is time consuming. The use of HPLC, TLC, and GC for the quality control of [F-18]FDG is both time consuming and expensive...

  9. A simple method for the quality control of [(18)F]FDG

    DEFF Research Database (Denmark)

    Koziorowski, J

    2010-01-01

    Most automated synthesis modules produce [(18)F]FDG within half an hour, but the quality control involving up to three separate methods and three different analytical systems is time consuming. The use of HPLC, TLC, and GC for the quality control of [(18)F]FDG is both time consuming and expensive...

  10. Region III involvement in quality control and quality assurance of radon testing methods

    International Nuclear Information System (INIS)

    Coyle, F.T.

    1990-01-01

    Region III has set a goal of increasing the testing for radon by our residents. One approach to this goal, is to bolster the public's confidence in the testing laboratories. We believe that this can be done most effectively by assuring the quality of the measurements available to the public. All Proficient Laboratories and Pennsylvania Certified Laboratories have submitted a quality assurance (QA) program. A QA audit checklist has been developed which will be finalized and made available to the states in our Region. This paper deals with inspection, verification, and documentation of the various laboratories and their compliance with prudent measuring protocols and addresses the following items: Organization and responsibilities; Sampling procedures; Detector chain of custody; Measurement procedures, quality control checks; State certification and RMP; Data resection, validation, and reporting; Quality assurance reports to management; Interview and discussion of QA audit with responsible officer

  11. Quality control of chemical heat treatment by the fractography method

    International Nuclear Information System (INIS)

    Tamarina, A.M.; Parygin, V.A.; Karpov, V.N.

    1978-01-01

    A fractographic investigation is carried out of fracture of a nitrided layer of 38KhMYuA steel and of cemented and cyanided layers of 12KhM3A steel. It is established that a fracture of the nitrided layer consists of three zones of crystalline facets: 1) a surface zone of fine crystalline facets located in a single plane and having the appearance of a white band (Σ-phase zone); 2) zone of acicular facets whose presence is due to the break-down of the carbonitride phase; 3) zone of large facets of boundary breakdown. The fractures of cemented and cyanided samples consist of multiple fine facets of multi-face shapes. It has been found that the depth and the microstructure of a diffusion layer in steel after chemothermal processing can be most rapidly and objectively evaluated by the fractographic method

  12. A GPS-Based Control Method for Load Sharing and Power Quality Improvement in Microgrids

    DEFF Research Database (Denmark)

    Golsorkhi, Mohammad; Lu, Dylan; Savaghebi, Mehdi

    2016-01-01

    This paper proposes a novel control method for accurate sharing of load current among the Distributed Energy Resources (DER) and high power quality operating in islanded ac microgrids. This control scheme is based on hierarchical structure comprising of decentralized primary controllers and a cen....... The secondary controller produces compensation signals at fundamental and dominant harmonics to improve the voltage quality at a sensitive load bus. Experimental results are presented to validate the efficacy of the proposed method.......This paper proposes a novel control method for accurate sharing of load current among the Distributed Energy Resources (DER) and high power quality operating in islanded ac microgrids. This control scheme is based on hierarchical structure comprising of decentralized primary controllers...

  13. Radioisotopic methods for quality control of works and studies while constructing foundations and underground structures

    International Nuclear Information System (INIS)

    Smorodinov, M.I.

    1980-01-01

    The data on the use of radioisotope methods of quality control of various kinds of construction works when building foundations and underground constructions and when carrying out scientific research, are presented. Devices and equipment are described, their block diagrams are presented. The experience in using radioisotope devices to control the quality of construction works, is presented. The problems of economic effectivenes of works using radioisotope devices are solved

  14. Validation of analytical methods for the quality control of Naproxen suppositories

    International Nuclear Information System (INIS)

    Rodriguez Hernandez, Yaslenis; Suarez Perez, Yania; Garcia Pulpeiro, Oscar; Hernandez Contreras, Orestes Yuniel

    2011-01-01

    The analysis methods that will be used for the quality control of the future Cuban-made Naproxen suppositories for adults and children were developed for the first time in this paper. One method based on direct ultraviolet spectrophotometry was put forward, which proved to be specific, linear, accurate and precise for the quality control of Naproxen suppositories, taking into account the presence of chromophore groups in their structure. Likewise, the direct semi-aqueous acid-base volumetry method aimed at the quality control of the Naproxen raw material was changed and adapted to the quality control of suppositories. On the basis of the validation process, there was demonstrated the adequate specificity of this method with respect to the formulation components, as well as its linearity, accuracy and precision in 1-3 mg/ml range. The final results were compared and no significant statistical differences among the replicas per each dose were found in both methods; therefore, both may be used in the quality control of Naproxen suppositories

  15. Analytical method for high resolution liquid chromatography for quality control French Macaw

    International Nuclear Information System (INIS)

    Garcia Penna, Caridad M; Torres Amaro, Leonid; Menendez Castillo, Rosa; Sanchez, Esther; Martinez Espinosa, Vivian; Gonzalez, Maria Lidia; Rodriguez, Carlos

    2007-01-01

    Was developed and validated an analytical method for high resolution liquid chromatography applicable to quality control of drugs dry French Macaw (Senna alata L. Roxb.) With ultraviolet detection at 340 nm. The method for high resolution liquid chromatography used to quantify the sennosides A and B, main components, was validated and proved to be specific, linear, precise and accurate. (Author)

  16. Quality Control of the Print with the Application of Statistical Methods

    Science.gov (United States)

    Simonenko, K. V.; Bulatova, G. S.; Antropova, L. B.; Varepo, L. G.

    2018-04-01

    The basis for standardizing the process of offset printing is the control of print quality indicators. The solution of this problem has various approaches, among which the most important are statistical methods. Practical implementation of them for managing the quality of the printing process is very relevant and is reflected in this paper. The possibility of using the method of constructing a Control Card to identify the reasons for the deviation of the optical density for a triad of inks in offset printing is shown.

  17. New patient-controlled abdominal compression method in radiography: radiation dose and image quality.

    Science.gov (United States)

    Piippo-Huotari, Oili; Norrman, Eva; Anderzén-Carlsson, Agneta; Geijer, Håkan

    2018-05-01

    The radiation dose for patients can be reduced with many methods and one way is to use abdominal compression. In this study, the radiation dose and image quality for a new patient-controlled compression device were compared with conventional compression and compression in the prone position . To compare radiation dose and image quality of patient-controlled compression compared with conventional and prone compression in general radiography. An experimental design with quantitative approach. After obtaining the approval of the ethics committee, a consecutive sample of 48 patients was examined with the standard clinical urography protocol. The radiation doses were measured as dose-area product and analyzed with a paired t-test. The image quality was evaluated by visual grading analysis. Four radiologists evaluated each image individually by scoring nine criteria modified from the European quality criteria for diagnostic radiographic images. There was no significant difference in radiation dose or image quality between conventional and patient-controlled compression. Prone position resulted in both higher dose and inferior image quality. Patient-controlled compression gave similar dose levels as conventional compression and lower than prone compression. Image quality was similar with both patient-controlled and conventional compression and was judged to be better than in the prone position.

  18. Water quality control method and device for nuclear power plant and nuclear power plant

    International Nuclear Information System (INIS)

    Nagase, Makoto; Asakura, Yamato; Uetake, Naoto; Sawa, Toshio; Uchida, Shunsuke; Takeda, Renzo; Osumi, Katsumi.

    1993-01-01

    In a BWR type nuclear power plant, water quality of coolants is controlled so as to lower deposition rate of Co ions in reactor water on a fuel cladding tube. The water quality control method includes (1) decreasing an iron concentration in feedwater to less than 0.1ppb, (2) adjusting coolants weakly acidic and (3) controlling dissolved oxygen concentration in reactor water to 20ppb. This can decrease 60 Co ion concentration even if 60 Co ion concentration is increased by the change of environment for the operation in future, such as an operation with hydrogen injection and extention of fuel burnup degree. (T.M.)

  19. Comparison of bar pattern and edge method for MTF measurement in radiology quality control

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, M.; Alves, A.F.F; Bacchim Neto, F.A.; Pavan, A.L.M.; Rosa, M.E.D.; Miranda, J.R.A.; Pina, D.R. de, E-mail: drpina@fmb.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil)

    2015-08-15

    Spatial resolution is one of the parameters that is routinely checked during acceptance procedures and regular quality control measurements. The spatial resolution of a radiographic imaging device is most appropriately expressed in terms of its modulation transfer function (MTF), which indicates the decline of detector spatial resolution with spatial frequency. Traditionally used methods of MTF measurement involve imaging either a narrow slit or a sharp edge to obtain the detector line spread function (LSF), whose frequency transform leads to the MTF. In this work is presented a study of the measurement of the limiting spatial resolution using the MTF method and the line-pair bar-pattern method. Our aim is to compare the bar-pattern method with the MTF method and then evaluate what method is the best for the dairy quality control tests and when is better to perform one test or other. These acquisition procedures were tested according to its reproducibility and variation due to noise. (author)

  20. quality control

    International Nuclear Information System (INIS)

    Skujina, A.; Purina, S.; Riekstina, D.

    1999-01-01

    The optimal objects: soils, spruce needles and bracken ferns were found for the environmental monitoring in the regions of possible radioactive contamination - near SalaspiIs nuclear reactor and Ignalina nuclear power plant. The determination of Sr-90 was based on the radiochemical separation of Sr-90 (=Y-90) by HDEHP extraction and counting the Cerenkov radiation. The quality control of the results was carried out. (authors)

  1. Development of Quality Control Method for Glucofarmaka Antidiabetic Jamu by HPLC Fingerprint Analysis

    Directory of Open Access Journals (Sweden)

    Hanifullah Habibie

    2017-04-01

    Full Text Available Herbal medicines become increasingly popular all over the world for preventive and therapeutic purposes. Quality control of herbal medicines is important to make sure their safety and efficacy. Chromatographic fingerprinting has been accepted by the World Health Organization as one reliable strategy for quality control method in herbal medicines. In this study, high-performance liquid chromatography fingerprint analysis was developed as a quality control method for glucofarmaka antidiabetic jamu. The optimum fingerprint chromatogram were obtained using C18 as the stationary phase and linear gradient elution using 10–95% acetonitrile:water as the mobile phase within 60 minutes of elution and detection at 210 nm. About 20 peaks were detected and could be used as fingerprint of glucofarmaka jamu. To evaluate the analytical performance of the method, we determined the precision, reproducibility, and stability. The result of the analytical performance showed reliable results. The proposed method could be used as a quality control method for glucofarmaka antidiabetic jamu and also for its raw materials.

  2. Validation of the ultraviolet spectrophotometry method for the quality control of ciprofloxacin chlorhydrate in Ciprecu tablets

    International Nuclear Information System (INIS)

    Perez Navarro, Maikel; Rodriguez Hernandez, Yaslenis; Suarez Perez, Yania

    2014-01-01

    Quinolones are a group of antimicrobials of high clinical significance. Ciprofloxacin hydrochloride monohydrate is a second-generation antibacterial fluoroquinolone for treatment of several infections and is marketed as eye drops, injections, capsule and tablets. To develop and to validate an ultraviolet spectrophotometric analytical method to be used in the quality control of ciprofloxacin hydrochloride monohydrate in newly manufactured Ciprecu tablets

  3. Non-destructive methods and means for quality control of structural products

    International Nuclear Information System (INIS)

    Dmitriev, V.V.

    1989-01-01

    Progressive non-destructive methods (acoustic, magnetic, radiation with liquid penetrants) and means of control of structural product quality, allowing to determine the state of products and structures not only immediately after their production but directly at the erected or reconstructed objects are described

  4. Impact Assessment of Various Methods for Control of Synchronous Generator Excitation on Quality of Transient Processes

    Directory of Open Access Journals (Sweden)

    Y. D. Filipchik

    2011-01-01

    Full Text Available The paper considers an impact of various methods for control of an exciting current pertaining to a synchronous generator on the nature of transient processes. A control algorithm for the exciting current in relation to changes in sliding and acceleration of a generator rotor has been proposed in the paper. The algorithm makes it possible to improve quality of the transient processes due to reduction of oscillation range concerning as an active power so a δ-angle as well.

  5. Validation of the quality control methods for active ingredients of Fungirex cream

    International Nuclear Information System (INIS)

    Perez Navarro, Maikel; Rodriguez Hernandez, Yaslenis; Suarez Perez, Yania

    2014-01-01

    Fungirex cream is a two-drug product, that is, undecylenic acid and zinc undecylenate over a suitable basis. Since this is a product not documented in the official monographs of the pharmacopoeia, simple analytical methods were suggested for quantitation of analytes of interest in the cream, which are useful for release of newly prepared cream batches. To validate two volumetric methods for the quality control of active ingredients in Fungirex cream

  6. Validation of the quality control method for sodium dicloxacillin in Dicloxen capsules

    International Nuclear Information System (INIS)

    Rodriguez Hernandez, Yaslenis; Perez Navarro, Maikel; Suarez Perez, Yania

    2014-01-01

    Sodium dicloxacillin is a semi synthetic derivative of the isoxasocyl penicillin group that may appear in oral suspension form and in caplets. For the analysis of the raw materials and the finished products, it is recommended to use high performance liquid chromatography that is an unavailable method at the dicloxen capsule manufacturing lab for the routine analysis of the drug. To develop and to validate a useful ultraviolet spectrophotometry method for the quality control of sodium dicloxacillin in Dicloxen capsules

  7. An express method for optimally tuning an analog controller with respect to integral quality criteria

    Science.gov (United States)

    Golinko, I. M.; Kovrigo, Yu. M.; Kubrak, A. I.

    2014-03-01

    An express method for optimally tuning analog PI and PID controllers is considered. An integral quality criterion with minimizing the control output is proposed for optimizing control systems. The suggested criterion differs from existing ones in that the control output applied to the technological process is taken into account in a correct manner, due to which it becomes possible to maximally reduce the expenditure of material and/or energy resources in performing control of industrial equipment sets. With control organized in such manner, smaller wear and longer service life of control devices are achieved. A unimodal nature of the proposed criterion for optimally tuning a controller is numerically demonstrated using the methods of optimization theory. A functional interrelation between the optimal controller parameters and dynamic properties of a controlled plant is numerically determined for a single-loop control system. The results obtained from simulation of transients in a control system carried out using the proposed and existing functional dependences are compared with each other. The proposed calculation formulas differ from the existing ones by a simple structure and highly accurate search for the optimal controller tuning parameters. The obtained calculation formulas are recommended for being used by specialists in automation for design and optimization of control systems.

  8. Validation of analytical method for quality control of B12 Vitamin-10 000 injection

    International Nuclear Information System (INIS)

    Botet Garcia, Martha; Garcia Penna, Caridad Margarita; Troche Concepcion, Yenilen; Cannizares Arencibia, Yanara; Moreno Correoso, Barbara

    2009-01-01

    Analytical method reported by USA Pharmacopeia was validated for quality control of injectable B 1 2 Vitamin (10 000 U) by UV spectrophotometry because this is a simpler and low-cost method allowing quality control of finished product. Calibration curve was graphed at 60 to 140% interval, where it was linear with a correlation coefficient similar to 0, 9999; statistical test for interception and slope was considered non-significant. There was a recovery of 99.7 % in study concentrations interval where the Cochran (G) and Student(t) test were not significant too. Variation coefficient in repetition study was similar to 0.59 % for the 6 assayed replies, whereas in intermediate precision analysis, the Fisher and Student tests were not significant. Analytical method was linear, precise, specific and exact in study concentrations interval

  9. Statistical methods for quality assurance basics, measurement, control, capability, and improvement

    CERN Document Server

    Vardeman, Stephen B

    2016-01-01

    This undergraduate statistical quality assurance textbook clearly shows with real projects, cases and data sets how statistical quality control tools are used in practice. Among the topics covered is a practical evaluation of measurement effectiveness for both continuous and discrete data. Gauge Reproducibility and Repeatability methodology (including confidence intervals for Repeatability, Reproducibility and the Gauge Capability Ratio) is thoroughly developed. Process capability indices and corresponding confidence intervals are also explained. In addition to process monitoring techniques, experimental design and analysis for process improvement are carefully presented. Factorial and Fractional Factorial arrangements of treatments and Response Surface methods are covered. Integrated throughout the book are rich sets of examples and problems that help readers gain a better understanding of where and how to apply statistical quality control tools. These large and realistic problem sets in combination with the...

  10. Automated quality control methods for sensor data: a novel observatory approach

    Directory of Open Access Journals (Sweden)

    J. R. Taylor

    2013-07-01

    Full Text Available National and international networks and observatories of terrestrial-based sensors are emerging rapidly. As such, there is demand for a standardized approach to data quality control, as well as interoperability of data among sensor networks. The National Ecological Observatory Network (NEON has begun constructing their first terrestrial observing sites, with 60 locations expected to be distributed across the US by 2017. This will result in over 14 000 automated sensors recording more than > 100 Tb of data per year. These data are then used to create other datasets and subsequent "higher-level" data products. In anticipation of this challenge, an overall data quality assurance plan has been developed and the first suite of data quality control measures defined. This data-driven approach focuses on automated methods for defining a suite of plausibility test parameter thresholds. Specifically, these plausibility tests scrutinize the data range and variance of each measurement type by employing a suite of binary checks. The statistical basis for each of these tests is developed, and the methods for calculating test parameter thresholds are explored here. While these tests have been used elsewhere, we apply them in a novel approach by calculating their relevant test parameter thresholds. Finally, implementing automated quality control is demonstrated with preliminary data from a NEON prototype site.

  11. Quality Control Applications

    CERN Document Server

    Chorafas, Dimitris N

    2013-01-01

    Quality control is a constant priority in electrical, mechanical, aeronautical, and nuclear engineering – as well as in the vast domain of electronics, from home appliances to computers and telecommunications. Quality Control Applications provides guidance and valuable insight into quality control policies; their methods, their implementation, constant observation and associated technical audits. What has previously been a mostly mathematical topic is translated here for engineers concerned with the practical implementation of quality control. Once the fundamentals of quality control are established, Quality Control Applications goes on to develop this knowledge and explain how to apply it in the most effective way. Techniques are described and supported using relevant, real-life, case studies to provide detail and clarity for those without a mathematical background. Among the many practical examples, two case studies dramatize the importance of quality assurance: A shot-by-shot analysis of the errors made ...

  12. MODERN INSTRUMENTAL METHODS TO CONTROL THE SEED QUALITY IN ROOT VEGETABLES

    Directory of Open Access Journals (Sweden)

    F. B. Musaev

    2017-01-01

    Full Text Available The standard methods of analysis don’t meet all modern requirements to determine the seed a quality. These methods can’t unveil inner deficiencies that are very important to control seed viability. The capabilities of new instrumental method to analyze the seed quality of root vegetables were regarded in the article. The method of micro-focus radiography is distinguished from other existing methods by more sensitivity, rapidity and easiness to be performed. Based on practical importance the visualization of inner seed structure, it allows determining far before seed germination the degree of endosperm development and embryo; the presence of inner damages and infections, occupation and damage caused by pests. The use of micro-focus radiography enables to detect the degree of seed quality difference for some traits such as monogermity and self-fertilization that are economically valuable for breeding program in red beet. With the aid of the method the level of seed development, damage and inner deficiencies in carrot and parsnip can be revealed. In X-ray projection seeds of inbred lines of radish significantly differed from variety population ones for their underdevelopment in the inner structure. The advantage of the method is that seeds rest undamaged after quality analyzing and both can be used for further examination with the use of other methods or be sown; that is quite important for breeders, when handling with small quantity or collectable plant breeding material. The results radiography analyses can be saved and archived that enables to watch for seed qualities in dynamic; this data can be also used at possible arbitration cases. 

  13. Analytical chemistry in semiconductor manufacturing: Techniques, role of nuclear methods and need for quality control

    International Nuclear Information System (INIS)

    1989-06-01

    This report is the result of a consultants meeting held in Gaithersburg, USA, 2-3 October 1987. The meeting was hosted by the National Bureau of Standards and Technology, and it was attended by 18 participants from Denmark, Finland, India, Japan, Norway, People's Republic of China and the USA. The purpose of the meeting was to assess the present status of analytical chemistry in semiconductor manufacturing, the role of nuclear analytical methods and the need for internationally organized quality control of the chemical analysis. The report contains the three presentations in full and a summary report of the discussions. Thus, it gives an overview of the need of analytical chemistry in manufacturing of silicon based devices, the use of nuclear analytical methods, and discusses the need for quality control. Refs, figs and tabs

  14. Protein array staining methods for undefined protein content, manufacturing quality control, and performance validation.

    Science.gov (United States)

    Schabacker, Daniel S; Stefanovska, Ivana; Gavin, Igor; Pedrak, Casandra; Chandler, Darrell P

    2006-12-01

    Methods to assess the quality and performance of protein microarrays fabricated from undefined protein content are required to elucidate slide-to-slide variability and interpolate resulting signal intensity values after an interaction assay. We therefore developed several simple total- and posttranslational modification-specific, on-chip staining methods to quantitatively assess the quality of gel element protein arrays manufactured with whole-cell lysate in vitro protein fractions derived from two-dimensional liquid-phase fractionation (PF2D) technology. A linear dynamic range of at least 3 logs was observed for protein stains and immobilized protein content, with a lower limit of detection at 8 pg of protein per gel element with Deep Purple protein stain and a field-portable microarray imager. Data demonstrate the successful isolation, separation, transfer, and immobilization of putative transmembrane proteins from Yersinia pestis KIM D27 with the combined PF2D and gel element array method. Internal bovine serum albumin standard curves provided a method to assess on-chip PF2D transfer and quantify total protein immobilized per gel element. The basic PF2D array fabrication and quality assurance/quality control methods described here therefore provide a standard operating procedure and basis for developing whole-proteome arrays for interrogating host-pathogen interactions, independent of sequenced genomes, affinity tags, or a priori knowledge of target cell composition.

  15. Application of environmetric methods to investigate control factors on water quality

    Directory of Open Access Journals (Sweden)

    Boyacioglu Hülya

    2017-09-01

    Full Text Available In the study, environmetric methods were successfully performed a to explore natural and anthropogenic controls on reservoir water quality, b to investigate spatial and temporal differences in quality, and c to determine quality variables discriminating three reservoirs in Izmir, Turkey. Results showed that overall water quality was mainly governed by “natural factors” in the whole region. A parameter that was the most important in contributing to water quality variation for one reservoir was not important for another. Between summer and winter periods, difference in arsenic concentrations were statistically significant in the Tahtalı, Ürkmez and iron concentrations were in the Balçova reservoirs. Observation of high/low levels in two seasons was explained by different processes as for instance, dilution from runoff at times of high flow seeped through soil and entered the river along with the rainwater run-off and adsorption. Three variables “boron, arsenic and sulphate” discriminated quality among Balçova & Tahtalı, Balçova & Ürkmez and two variables “zinc and arsenic” among the Tahtalı & Ürkmez reservoirs. The results illustrated the usefulness of multivariate statistical techniques to fingerprint pollution sources and investigate temporal/spatial variations in water quality.

  16. Evaluation and quality control of radiometric and spectrometric methods used in LVRA of Cuba CPHR

    International Nuclear Information System (INIS)

    Perez, Danyl; Prendes, Miguel; Fernandez, Isis M.; Gonzalez, Leidy

    1997-01-01

    The Surveillance Radiological Environmental Laboratory of the Center for Hygiene and Radiation Protection of Cuba, has developed a quality assurance system for the analytical services that it offers. The laboratory has designed and implemented a statistical control program for some measurements of standard samples and certificate reference materials. Statistical tests were used to determine the deviation of experimental results from the certificates ones. The results statistical analysis showed that the used methods are precise and exact in agreement with the requirements demanded for the measurements currently made in the laboratory. As a result a methodology for quality assurance of described methods was established and this experience is applicable to other analytical methods in the laboratory. (author). 15 refs., fig., 3 tabs

  17. Non-destructive evaluation methods to improve quality control in low enrichment MTR fuel plate production

    International Nuclear Information System (INIS)

    Milne, J.M.; Lidington, B.; Hawker, B.M.

    1991-01-01

    This paper summarises some preliminary non-destructive measurements made recently at the Harwell Laboratory on a prototype low enrichment MTR fuel plate. The measurements were intended to indicate the potential of two different techniques for improving quality control in plate production. Pulse Video Thermography (PVT) is being considered as an alternative to ultrasound transmission measurements for the detection and sizing of lack of thermal bonding between the fuel and the clad layers, either to verify the indications from the established ultrasonic methods before destroying the plate or as a replacement method of inspection. High frequency pulse-echo ultrasonics is being considered for providing maps of clad layer thickness on each side of the plate. The measurements have indicated the potential for both methods, but more work is required, using a test plate containing controlled defects, to establish their capability. (orig.)

  18. Introduction of the new process and quality control methods in fuel fabrication at Siemens/ANF

    International Nuclear Information System (INIS)

    Rogge, K.T.; Fickers, H.H.; Doerr, W.

    2000-01-01

    The central point of ANFs quality philosophy is the process of continuous improvements. With respect to the causes of defects and the efforts needed for elimination, the importance of continuous improvements is evident. In most of the cases, defects are caused in the initial stages of a product but the majority of the problems will be only detected during fabrication and inspection and in the worst case when the product is already in use. Goal of the improvement process is to assure a high product quality. Therefore, the efforts are focused on robust and centered processes. A reasonable quality planning is the basis for achieving and maintaining the quality targets. Quality planning includes prefabrication studies, in-process inspections and final inspections. The inspections provide a large amount of various quality data, process parameters as well as product proper-ties. Key data will be defined and subjected to a statistical analysis. In view of the effectiveness of the analysis, it is important, that the process parameters which influence the characteristics of the product are well known and that appropriate methods for data evaluation and visualization will be used. Main approach of the data visualization is to obtain a tighter control of the product properties and to improve the process robustness by implementation of defined improvements. With respect to the fuel safety and fuel performance, the presentation shows for typical product quality characteristics some examples of visualized quality data. The examples includes the integrity of the pellet column (rod scanner results), the spring force of PWR spacers (critical characteristic with regard to rod fretting) and the spacer intersection weld size (thermo-hydraulic fuel bundle behaviour). The presentation also includes an example for the statistical process control, the in-line surveillance of the fuel rod weld parameters which assures the integrity of the welds within tight tolerance ranges. The quality

  19. An Overview on Novel Microbial Determination Methods in Pharmaceutical and Food Quality Control

    Directory of Open Access Journals (Sweden)

    Mahboob Nemati

    2016-09-01

    Full Text Available Traditional microbiological methods tend to be labor-intensive and time-consuming. Rapid and novel methods in microbiological tests provide more sensitive, precise and reproducible results compared with conventional methods. In microbiology, the most rapid testing methods belong to the field of biotechnology such as PCR, ELISA, ATP bioluminescence and etc. Nevertheless impedance microbiology, biosensors and analytical procedures to determine microbial constituents are of significance. The present review article was conducted using internet databases and related scientific literatures and articles that provide information on developments in the rapid methods in microbiology. The main focus is on the application of rapid methods in microbial quality control of pharmaceutical products. Reviewed literature showed that rapid methods and automation in microbiology is an advanced area for studying and applying of improved methods in the early detection, and characterization of microorganisms and their products in food, pharmaceutical and cosmetic industrials as well as environmental monitoring and clinical applications. It can be concluded that rapid methods and automation in microbiology should continue as potent and efficient technologies to develop the novel tests to be performed in the future because of the ever-increasing concerns about the safety of food and pharmaceutical products. However the main issues to be considered are the scale up of developed methods and the regulatory requirements.

  20. Statistical methods for quality improvement

    National Research Council Canada - National Science Library

    Ryan, Thomas P

    2011-01-01

    ...."-TechnometricsThis new edition continues to provide the most current, proven statistical methods for quality control and quality improvementThe use of quantitative methods offers numerous benefits...

  1. [Coronary artery bypass surgery: methods of performance monitoring and quality control].

    Science.gov (United States)

    Albert, A; Sergeant, P; Ennker, J

    2009-10-01

    The strength of coronary bypass operations depends on the preservation of their benefits regarding freedom of symptoms, quality of life and survival, over decades. Significant variability of the results of an operative intervention according to the hospital or the operating surgeon is considered a weakness in the procedure. The external quality insurance tries to reach a transparent service providing market through hospital ranking comparability. Widely available information and competition will promote the improvement of the whole quality. The structured dialog acts as a control instrument for the BQS (Federal Quality Insurance). It is launched in case of deviations from the standard references or statistically significant differences between the results of the operations in any hospital and the average notational results. In comparison to the external control the hospital internal control has greater ability to reach a medically useful statement regarding the results of the treatment and to correct the mistakes in time. An online information portal based on a departmental databank (DataWarehouse, DataMart) is an attractive solution for the physician in order to get transparently and timely informed about the variability in the performance.The individual surgeon significantly influences the short- and long-term treatment results. Accordingly, selection, targeted training and performance measurements are necessary.Strict risk management and failure analysis of individual cases are included in the methods of internal quality control aiming to identify and correct the inadequacies in the system and the course of treatment. According to the international as well as our own experience, at least 30% of the mortalities after bypass operations are avoidable. A functioning quality control is especially important in minimally invasive interventions because they are often technically more demanding in comparison to the conventional procedures. In the field of OPCAB surgery

  2. Validation of a cartridge method for the quality control determination of 99Tcm-HMPAO

    International Nuclear Information System (INIS)

    Pandos, G.; Penglis, S.; Tsopelas, C.; Royal Adelaide Hospital, Adelaide, SA

    1999-01-01

    Full text: The manufacturer's method for assessing the radiochemical purity (RCP) of ±-HMPAO requires the use of three solvent types on two different stationary phases, and is time-consuming (∼ 15 min) in consideration of the short shelf-life (30 min). An impetus to develop a rapid quality control procedure for this product has led to the use of a single strip Whatman 17 chromatography system using ethyl acetate as the developing solvent. This popular Whatman paper system was previously validates against the manufacturer's method. We have developed a new method to successfully determine the % RCP of ±-HMPAO, which employs a disposable, inexpensive and reusable Amprep C-18 cartridge with normal saline as a non-organic mobile phase. The Whatman paper system separates the primary lipophilic 99 Tc m -HMPAO complex from 99 Tc m O-2, 99 Tc m O 4 and secondary 99 Tc m -HMPAO complex at the origin. By comparison, the lipophilic portion was retained on the cartridge and the hydrophilic impurities were found in saline eluent with the cartridge method. Whatman 17 paper system results showed 95.1 ± I.7% 99 Tc m -HMPAO after 5 min and the cartridge method gave 95.5 ± 1.5% 99 Tc m -HMPAO (n = 8) after 3 min. The % 99 Tc m O 2 levels in 99 Tc m -HMPAO were insignificant. When a failed kit was assessed for RCP at 2.5 h post-reconstitution, the Whatman paper system and the cartridge method correlated well, resulting in 63.1 ± 2.7% and 62.9±2.1% 99 Tc m -HMPAO (n=3) respectively. Although the cartridge method may slightly overestimate the % RCP of 99 Tc m -HMPAO, it was found to be simple, rapid and reliable for the quality control analysis of routine 99 Tc m -HMPAO preparations

  3. Method of controlling coherent synchroton radiation-driven degradation of beam quality during bunch length compression

    Science.gov (United States)

    Douglas, David R [Newport News, VA; Tennant, Christopher D [Williamsburg, VA

    2012-07-10

    A method of avoiding CSR induced beam quality defects in free electron laser operation by a) controlling the rate of compression and b) using a novel means of integrating the compression with the remainder of the transport system: both are accomplished by means of dispersion modulation. A large dispersion is created in the penultimate dipole magnet of the compression region leading to rapid compression; this large dispersion is demagnified and dispersion suppression performed in a final small dipole. As a result, the bunch is short for only a small angular extent of the transport, and the resulting CSR excitation is small.

  4. Preparation method and quality control of multigamma volume sources with different matrices.

    Science.gov (United States)

    Listkowska, A; Lech, E; Saganowski, P; Tymiński, Z; Dziel, T; Cacko, D; Ziemek, T; Kołakowska, E; Broda, R

    2018-04-01

    The aim of the work was to develop new radioactive standard sources based on epoxy resins. The optimal proportions of the components and the homogeneity of the matrices were determined. The activity of multigamma sources prepared in Marinelli beakers was determined with reference to the National Standard of Radionuclides Activity in Poland. The difference of radionuclides activity values determined using calibrated gamma spectrometer and the activity of standard solutions used are in most cases significantly lower than measurement uncertainty limits. Sources production method and quality control procedure have been developed. Copyright © 2017 Elsevier Ltd. All rights reserved.

  5. Validation of a liquid chromatographic method for the pharmaceutical quality control of products containing elacridar

    Directory of Open Access Journals (Sweden)

    Emilia Sawicki

    2016-08-01

    Full Text Available Many anticancer drugs have an impaired bioavailability and poor brain penetration because they are substrates to drug efflux pumps such as P-glycoprotein and Breast Cancer Resistance Protein. Elacridar is a strong inhibitor of these two drug efflux pumps and therefore has great potential to improve oral absorption and brain penetration of many anticancer drugs. Currently, a clinical formulation of elacridar is unavailable and therefore the pharmaceutical development of a drug product is highly warranted. This also necessitates the availability of an analytical method for its quality control. A reverse-phase high-performance liquid chromatographic method with ultraviolet detection was developed for the pharmaceutical quality control of products containing elacridar as the active pharmaceutical ingredient. The analytical method was validated for linearity, accuracy, precision, selectivity, carry-over, stability of stock and reference solutions, stability of the final extract, stability-indicating capability and impurity testing. We found that elacridar is unstable in aqueous solutions that are exposed to light because a hydroxylation product of elacridar is formed. Therefore, sample solutions with elacridar must be protected from light.

  6. Quality assurance and quality control

    International Nuclear Information System (INIS)

    Kaden, W.

    1986-01-01

    General preconditions and methods for QA work in the nuclear field are analysed. The application of general QA principles to actual situations is illustrated by examples in the fields of engineering and of the manufacturing of mechanical and electrical components. All QA measures must be fitted to the complexity and relevance of the work steps, which are under consideration. The key to good product quality is the control of working processes. The term 'controlled process' is discussed in detail and examples of feed back systems are given. The main QA measures for the operation of nuclear power plants include the establishment of a Quality Assurance Program, training and qualification of personnel, procurement control, inspection and tests, reviews and audits. These activities are discussed. (orig.)

  7. A quality control method for detecting energy changes of medical accelerators

    International Nuclear Information System (INIS)

    McGinley, P.H.

    2000-01-01

    A description is presented of a simple and sensitive method for detecting a change in the energy of the electrons bombarding the target of medical accelerators. This technique is useful for x-ray beams with end point energy in the range of 15.7 to 25 MeV. The method is based on the photoactivation of 16 O and 14 N in a small sample of ammonium nitrate. It was found that the ratio of the activity induced in the oxygen divided by that produced in the nitrogen can be used as a quality control technique to detect a change in the energy of the electrons that bombard the target of the accelerator. An electron energy change of the order of 0.2 MeV can be determined using this method. (author)

  8. Analytical method validation for quality control and the study of the 50 mg Propylthiouracil stability

    International Nuclear Information System (INIS)

    Valdes Bendoyro, Maria Olga; Garcia Penna, Caridad Margarita; Fernandez, Juan Lugones; Garcia Borges, Lisandra; Martinez Espinosa, Vivian

    2010-01-01

    A high-performance liquid chromatography analytical method was developed and validated for the quality control and stability studies of 50 mg Propylthiouracil tablets. Method is based in active principle separation through a 100 RP-18 RP-18 (5 μm) (250 x 4 mm) Lichrospher chromatography with UV detection to 272 nm, using a mobile phase composed by a ungaseous mixture of a 0.025 M buffer solution-monobasic potassium phosphate to pH= 4,6 ad acetonitrile in a 80:20 ratio with a flux speed of 0,5 mL/min. Analytical method was linear, precise, specific and exact in the study concentrations interval

  9. Data Quality Control: Challenges, Methods, and Solutions from an Eco-Hydrologic Instrumentation Network

    Science.gov (United States)

    Eiriksson, D.; Jones, A. S.; Horsburgh, J. S.; Cox, C.; Dastrup, D.

    2017-12-01

    Over the past few decades, advances in electronic dataloggers and in situ sensor technology have revolutionized our ability to monitor air, soil, and water to address questions in the environmental sciences. The increased spatial and temporal resolution of in situ data is alluring. However, an often overlooked aspect of these advances are the challenges data managers and technicians face in performing quality control on millions of data points collected every year. While there is general agreement that high quantities of data offer little value unless the data are of high quality, it is commonly understood that despite efforts toward quality assurance, environmental data collection occasionally goes wrong. After identifying erroneous data, data managers and technicians must determine whether to flag, delete, leave unaltered, or retroactively correct suspect data. While individual instrumentation networks often develop their own QA/QC procedures, there is a scarcity of consensus and literature regarding specific solutions and methods for correcting data. This may be because back correction efforts are time consuming, so suspect data are often simply abandoned. Correction techniques are also rarely reported in the literature, likely because corrections are often performed by technicians rather than the researchers who write the scientific papers. Details of correction procedures are often glossed over as a minor component of data collection and processing. To help address this disconnect, we present case studies of quality control challenges, solutions, and lessons learned from a large scale, multi-watershed environmental observatory in Northern Utah that monitors Gradients Along Mountain to Urban Transitions (GAMUT). The GAMUT network consists of over 40 individual climate, water quality, and storm drain monitoring stations that have collected more than 200 million unique data points in four years of operation. In all of our examples, we emphasize that scientists

  10. The radiological quality of the environment: strategies and methods of control

    International Nuclear Information System (INIS)

    Gazal, Suzanne; Amiard, Jean-Claude; Chenal, Christian; Levasseur, Jacques-Edouard

    2014-01-01

    As the nature of risk, and the relation to it, have evolved, and as events such as industrial catastrophes, hazards related to climate change, or health crisis have modified the problematic of risk and its social acceptability, a strong demand for a reliable and available access to information has emerged among the civil society, as well as a demand of citizen commitment and implication in the expertise process. In this context, the implementation of local information commissions (CLIs) in December 1981 has been an answer to this demand. These structures have been more recently given a specific legal status in a law on transparency and safety in the nuclear sector. Produced by the national association of local information committees and commissions (ANCCLI), this collective publication aims at providing a comprehensive document on strategies and methods of control of the radiological quality of the environment. After a recall of the various components of the eco-sphere (atmospheric, aquatic and ground media) and of their interactions, this book proposes an overview of the various methods of radiological control of the environment (air, water, sediments, soils, fauna, flora, food supply chain, and so on). The first part addresses the detection and the quantification of radioactive contaminants in physical media (atmosphere, water, soil) and in biological organisms and products transformed by man. It details the sources of radioactive pollution and measurements to be performed. It also discusses methodological issues. It addresses the adopted approach to the control of the quality of the environment through the study of biological organisms (bio-indicators), and details available methods for the assessment of direct and indirect biological effects of exposures to low doses of external and internal irradiation. A last part presents the actors of the radiological control of the environment in France, notably the CLIs which are active at the vicinity of nuclear

  11. New analytical methods for quality control of St. John's wort

    International Nuclear Information System (INIS)

    Huck-Pezzei, V.

    2013-01-01

    In the present work, a novel analytical platform is introduced, which enables both anal-ysis and quality control of St. John´s wort extracts and tissue. The synergistic combina-tion of separation techniques (including thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC)) with mass spectrometry (MS) and vibra-tional spectroscopy is demonstrated to get deeper insights into the ingredients composi-tion. TLC was successfully employed to identify some unknown ingredients being pre-sent in samples with Chinese provenience. The here described novel HPLC method allowed to differentiate clearly between European and Chinese samples on one hand, on the other hand this method could successfully be employed for the semi-preparative isolation of the unknown ingredient. Matrix-free laser desorption ionization time of flight mass spectrometry (mf-LDI-TOF/MS) using a special designed titanium oxide layer was employed to identify the structure of the substance. The analytical knowledge generated so far was used to establish an infrared spectroscopic model allowing both quantitative analysis of ingredients as well as differentiating between European and Chinese provenience. Finally, infrared imaging spectroscopy was conducted to get knowledge about the high resolved distribution of ingredients. The analytical platform established can be used for fast and non-destructive quantitation and quality control to identify adulteration being of interest according to the Deutsche Arzneimittel Codex (DAC) even for the phytopharmaceutical industry. (author) [de

  12. Application of risk analysis and quality control methods for improvement of lead molding process

    Directory of Open Access Journals (Sweden)

    H. Gołaś

    2016-10-01

    Full Text Available The aim of the paper is to highlight the significance of implication of risk analysis and quality control methods for the improvement of parameters of lead molding process. For this reason, Fault Mode and Effect Analysis (FMEA was developed in the conceptual stage of a new product TC-G100-NR. However, the final product was faulty (a complete lack of adhesion of brass insert to leak regardless of the previously defined potential problem and its preventive action. It contributed to the recognition of root causes, corrective actions and change of production parameters. It showed how these methods, level of their organization, systematic and rigorous study affect molding process parameters.

  13. Quality Control Method for a Micro-Nano-Channel Microfabricated Device

    Science.gov (United States)

    Grattoni, Alessandro; Ferrari, Mauro; Li, Xuewu

    2012-01-01

    A variety of silicon-fabricated devices is used in medical applications such as drug and cell delivery, and DNA and protein separation and analysis. When a fluidic device inlet is connected to a compressed gas reservoir, and the outlet is at a lower pressure, a gas flow occurs through the membrane toward the outside. The method relies on the measurement of the gas pressure over the elapsed time inside the upstream and downstream environments. By knowing the volume of the upstream reservoir, the gas flow rate through the membrane over the pressure drop can be calculated. This quality control method consists of measuring the gas flow through a device and comparing the results with a standard curve, which can be obtained by testing standard devices. Standard devices can be selected through a variety of techniques, both destructive and nondestructive, such as SEM, AFM, and standard particle filtration.

  14. Quality control of intelligence research

    International Nuclear Information System (INIS)

    Lu Yan; Xin Pingping; Wu Jian

    2014-01-01

    Quality control of intelligence research is the core issue of intelligence management, is a problem in study of information science This paper focuses on the performance of intelligence to explain the significance of intelligence research quality control. In summing up the results of the study on the basis of the analysis, discusses quality control methods in intelligence research, introduces the experience of foreign intelligence research quality control, proposes some recommendations to improve quality control in intelligence research. (authors)

  15. A simple and accurate method for the quality control of the I.I.-DR apparatus using the CCD camera

    International Nuclear Information System (INIS)

    Igarashi, Hitoshi; Shiraishi, Akihisa; Kuraishi, Masahiko

    2000-01-01

    With the advancing development of CCD cameras, the I.I.-DR apparatus has been introduced into the x-ray fluoroscopy television system. Consequently, quality control of the system has become a complicated task. We developed a simple, accurate method for quality control of the I.I.-DR apparatus using the CCD camera. Experiments were separately performed for the imager system [laser imager, DDX (dynamic digital x-ray system)] and the imaging system (I.I., ND-filter, IRIS, CCD camera). Quality control of the imager system was done by simply examining both input and output characteristics with a sliding pattern. Quality control of the imaging system was also conducted by estimating AVE (the average volume element), which was obtained using a phantom under the constant conditions. The results indicated that this simplified method is useful as a weekly quality control check of the I.I.-DR apparatus using the CCD camera. (author)

  16. A method of quality control in continuous for the thyroid hormones radioimmunoassay

    International Nuclear Information System (INIS)

    Savoie, J.C.; Kawadry, G.; Leger, F.A.; Hantour, Z.; Baulieu, J.L.

    1980-01-01

    The exploration of the thyroid function requires nowadays the T4, T3 and TSH radioimmunoassays. These assays, performed several times each week, raise the problem as to how control the quality of every new series and of every result. The authors describe the principle features of a program devised to automatically control 'in continuous' the quality of the radioimmunoassays. This program was developed on a SIMIS 3-INFORMATEK system. It is derived from Rodbard's work, uses Logit-Log transformation and ensures the consistent interseries control of many characteristic parameters. No series nor individual results are exploited i.e. edited without prior control of quality a decision from which is made to validate or reject. This program is but one solution -among many others possible- corresponding to a necessity: the need presently felt and perhaps to-morrow requested for some permanent quality control of the results of radioimmunoassays [fr

  17. Measuring the quality of infection control in Dutch nursing homes using a standardized method; the Infection prevention RIsk Scan (IRIS)

    NARCIS (Netherlands)

    Willemsen, I.; Nelson-Melching, J.; Hendriks, Y.; Mulders, A.; Verhoeff, S.; Kluytmans-Vandenbergh, M.; Kluytmans, J.

    2014-01-01

    BACKGROUND: We developed a standardised method to assess the quality of infection control in Dutch Nursing Home (NH), based on a cross-sectional survey that visualises the results. The method was called the Infection control RIsk Infection Scan (IRIS). We tested the applicability of this new tool in

  18. [Quality of life of the colostomized person with or without use of methods of bowel control].

    Science.gov (United States)

    Cesaretti, Isabel Umbelina Ribeiro; Santos, Vera Lúcia Conceição Gouveia; Vianna, Lucila Amaral Carneiro

    2010-01-01

    To evaluate and to compare the quality of life (QoL) of colostomy people, using or not using the bowel control methods (BCM), in other words, the colostomy irrigation and the plug system, considering the hypothesis that people who used them had better QoL. This study was carried out in the Heliópolis Hospital Outpatient Department, after the project approval for the Ethical and Research Committee, using the WHOQoL-bref. The sample was constituted of two groups: 50 colostomy people with BCM and 50, without BCM. The Group with BCM had a QoL significantly higher, being this observed in all the Domains and in the Overall QoL, than those of the Group without BCM. The study confirmed the hypothesis that the QoL of the Group with BCM is better than the Group without BCM.

  19. Improved method to obtain pfaffic acid as a marker for quality control

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Marili Villa Nova; Vedovello, Amanda; Rodrigues, Rodney Alexandre Ferreira; Montanari Junior, Ilio; Rehder, Vera Lucia Garcia, E-mail: rodney@cpqba.unicamp.br [Centro Pluridisciplinar de Pesquisas Quimicas, Biologicas e Agricolas, Universidade Estadual de Campinas, SP (Brazil)

    2013-09-01

    Pfaffic acid, a marker of Hebanthe eriantha (Brazilian ginseng), was first isolated in 1983 but is not yet commercially available. This lack of availability compromises the quality control of this plant and its derivatives. This paper proposes a process for pfaffic acid isolation from roots of H. eriantha at a purity suitable for analytical purposes. The steps involved in this process included extraction, hydrolysis, fractionation and purification by preparative HPLC. This process led to isolation of pfaffic acid with a chromatographic purity of 98.5% in a 0.25% yield from dried roots of H. eriantha; this yield is more than forty times higher than that of the current method in the literature. (author)

  20. Internal quality control of PCR-based genotyping methods in research studies and patient diagnostics

    DEFF Research Database (Denmark)

    Bladbjerg, Else-Marie; Gram, Jørgen; Jespersen, Jørgen

    2002-01-01

    Genetic analyses are increasingly integrated in the clinical laboratory, and internal quality control programmes are needed. We have focused on quality control aspects of selected polymorphism analyses used in thrombosis research. DNA was isolated from EDTA-blood (n = 500) by ammonium acetate....... Control of data handling revealed 0.1% reading mistakes and 0.5% entry mistakes. Based on our experiences we propose an internal quality control programme for widely used PCR-based haemostasis polymorphism analyses.......-isolation (pre-analytical factors), DNA-amplification, digestion with restriction enzymes, electrophoresis (analytical factors), result reading and entry into a database (post-analytical factors). Furthermore, we evaluated a procedure for result confirmation. Isolated DNA was of good quality (42 microg/ml blood...

  1. Aroma analysis and quality control of food using highly sensitive analytical methods

    International Nuclear Information System (INIS)

    Mayr, D.

    2003-02-01

    This thesis deals with the development of quality control methods for food based on headspace measurements by Proton-Transfer-Reaction Mass-Spectrometry (PTR-MS) and with aroma analysis of food using PTR-MS and Gas Chromatography-Olfactometry (GC-O). An objective method was developed for the determination of a herb extract's quality; this quality was checked by a sensory analysis until now. The concentrations of the volatile organic compounds (VOCs) in the headspace of 81 different batches were measured by PTR-MS. Based on the sensory judgment of the customer, characteristic differences in the emissions of 'good' and 'bad' quality samples were identified and a method for the quality control of this herb extract was developed. This novel method enables the producing company to check and ensure that they are only selling high-quality products and therefore avoid complaints of the customer. Furthermore this method can be used for controlling, optimizing and automating the production process. VOCs emitted by meat were investigated using PTR-MS to develop a rapid, non-destructive and quantitative technique for determination of the microbial contamination of meat. Meat samples (beef, pork and poultry) that were wrapped into different kinds of packages (air and vacuum) were stored in at 4 o C for up to 13 days. The emitted VOCs were measured as a function of storage time and identified partly. The concentration of many of the measured VOCs, e.g. sulfur compounds like methanethiol, dimethylsulfide and dimethyldisulfide, largely increased over the storage time. There were big differences in the emissions of normal air- and vacuum-packed meat. VOCs typically emitted by air-packaged meat were methanethiol, dimethylsulfide and dimethyldisulfide, while ethanol and methanol were found in vacuum-packaged meat. A comparison of the PTR-MS results with those obtained by a bacteriological examination performed at the same time showed strong correlations (up to 99 %) between the

  2. A Validated Method for the Quality Control of Andrographis paniculata Preparations.

    Science.gov (United States)

    Karioti, Anastasia; Timoteo, Patricia; Bergonzi, Maria Camilla; Bilia, Anna Rita

    2017-10-01

    Andrographis paniculata is a herbal drug of Asian traditional medicine largely employed for the treatment of several diseases. Recently, it has been introduced in Europe for the prophylactic and symptomatic treatment of common cold and as an ingredient of dietary supplements. The active principles are diterpenes with andrographolide as the main representative. In the present study, an analytical protocol was developed for the determination of the main constituents in the herb and preparations of A. paniculata . Three different extraction protocols (methanol extraction using a modified Soxhlet procedure, maceration under ultrasonication, and decoction) were tested. Ultrasonication achieved the highest content of analytes. HPLC conditions were optimized in terms of solvent mixtures, time course, and temperature. A reversed phase C18 column eluted with a gradient system consisting of acetonitrile and acidified water and including an isocratic step at 30 °C was used. The HPLC method was validated for linearity, limits of quantitation and detection, repeatability, precision, and accuracy. The overall method was validated for precision and accuracy over at least three different concentration levels. Relative standard deviation was less than 1.13%, whereas recovery was between 95.50% and 97.19%. The method also proved to be suitable for the determination of a large number of commercial samples and was proposed to the European Pharmacopoeia for the quality control of Andrographidis herba. Georg Thieme Verlag KG Stuttgart · New York.

  3. Development and experience of quality control methods for digital breast tomosynthesis systems.

    Science.gov (United States)

    Strudley, Cecilia J; Young, Kenneth C; Looney, Padraig; Gilbert, Fiona J

    2015-01-01

    To develop tomosynthesis quality control (QC) test methods and use them alongside established two-dimensional (2D) QC tests to measure the performance of digital breast tomosynthesis (DBT) systems used in a comparative trial with 2D mammography. DBT QC protocols and associated analysis were developed, incorporating adaptions of some 2D tests as well as some novel tests. The tomosynthesis tests were: mean glandular dose to the standard breast model; contrast-to-noise ratio in reconstructed focal planes; geometric distortion; artefact spread; threshold contrast detail detection in reconstructed focal planes, alignment of the X-ray beam to the reconstructed image and missed tissue; reproducibility of the tomosynthesis exposure; and homogeneity of the reconstructed focal planes. Summaries of results from the tomosynthesis QC tests are presented together with some 2D results for comparison. The tomosynthesis QC tests and analysis methods developed were successfully applied. The lessons learnt, which are detailed in the Discussion section, may be helpful to others embarking on DBT QC programmes. DBT performance test equipment and analysis methods have been developed. The experience gained has contributed to the subsequent drafting of DBT QC protocols in the UK and Europe.

  4. An alternative method for noise analysis using pixel variance as part of quality control procedures on digital mammography systems.

    NARCIS (Netherlands)

    Bouwman, R.; Young, K.; Lazzari, B.; Ravaglia, V.; Broeders, M.J.M.; Engen, R. van

    2009-01-01

    According to the European Guidelines for quality assured breast cancer screening and diagnosis, noise analysis is one of the measurements that needs to be performed as part of quality control procedures on digital mammography systems. However, the method recommended in the European Guidelines does

  5. A quality control method by ultrasonic vibration energy and diagnosis system at trimming process

    International Nuclear Information System (INIS)

    Suh, Chang Min; Song, Gil Ho; Pyoun, Young Shik

    2007-01-01

    In this paper, the characteristics in mechanical properties of ultrasonic cold forging treatment (UCFT) used for the trimming knife and the effects of ultrasonic vibration energy (UVE) into the trimming process on the state of the strip cutting face were studied. And a diagnosis system to quality control for trimming knife and strip cutting face was developed and installed in plant. By the plant application of UCFT, service life of knife was more increased over 100% than that of conventional knife and using the developed diagnosis system, the knife breakage and saw ear have been perfectly detected and quality control of trimming face is effectively obtained

  6. A simplified but effective method for the quality control of medicinal plants by planar chromatography.

    Science.gov (United States)

    Eloff, J N; Ntloedibe, D T; van Brummelen, R

    2011-01-01

    Three of the factors limiting the rational use of herbal medicine are uncertainty on effectivity, uncertainty on safety and variation in quality of the product. Because many herbal medicines have been used over centuries by indigenous peoples, the safety and effectivity is frequently not such a big concern. With more people collecting and distributing herbal medicine, the offered product is however, frequently not what the label indicates either through a genuine mistake, but also through fraud especially where expensive herbal medicine is concerned. Some wrong identifications have already led to serious side effects and deaths. Planar chromatography or thin layer chromatography [TLC] is widely used to verify the identity of plant extracts by determining the chemical fingerprint of the extracts. In a leading publication 17 different extractants, 41 solvent systems and 44 spray reagents have been used to verify the identity of important herbal preparations. We investigated whether a simplified system could not be developed to aid small laboratories in identifying different herbal medicines. We compared the efficacy of different extractants, identified and developed three TLC solvent systems that would separate compounds with low, medium and high polarity and then also investigated the use of several spray reagents. With acetone as extractant and benzene:ethanol:ammonia [9:1:0.1], chloroform:ethylacetate:formic acid [5:4:1] and ethylacetate:methanol:water [10:1.35:1] as TLC solvent system and vanillin-sulphuric acid as spray reagent the identity of 81 samples of more than 50 herbal preparations could be verified on the basis of the chromatograms. The same product from different suppliers usually gave similar chromatograms. More importantly in several cases it was clear that products with the same label were so different that a mistake must have occurred in the labelling. This method has found application in the quality control of the most important African medicinal

  7. Use of a sensitometric method in quality control of radiographic images

    International Nuclear Information System (INIS)

    Lima, A.A.; Furtado, A.P.A.; Nied, L.; Bacelar, A.; Pinto, A.L.A.; Acunha, B.

    1996-01-01

    A sensitometric method is used to evaluate the characteristic answer of several radiographic films and the quality of produced images. Data was collected daily in a period of three months. Results from this research show a disagreement of a 100% from the pattern of the sensitometric characteristics to the analysed films

  8. Methods and applications of statistics in engineering, quality control, and the physical sciences

    CERN Document Server

    Balakrishnan, N

    2011-01-01

    Inspired by the Encyclopedia of Statistical Sciences, Second Edition (ESS2e), this volume presents a concise, well-rounded focus on the statistical concepts and applications that are essential for understanding gathered data in the fields of engineering, quality control, and the physical sciences. The book successfully upholds the goals of ESS2e by combining both previously-published and newly developed contributions written by over 100 leading academics, researchers, and practitioner in a comprehensive, approachable format. The result is a succinct reference that unveils modern, cutting-edge approaches to acquiring and analyzing data across diverse subject areas within these three disciplines, including operations research, chemistry, physics, the earth sciences, electrical engineering, and quality assurance. In addition, techniques related to survey methodology, computational statistics, and operations research are discussed, where applicable. Topics of coverage include: optimal and stochastic control, arti...

  9. Quantifying viruses and bacteria in wastewater—Results, interpretation methods, and quality control

    Science.gov (United States)

    Francy, Donna S.; Stelzer, Erin A.; Bushon, Rebecca N.; Brady, Amie M.G.; Mailot, Brian E.; Spencer, Susan K.; Borchardt, Mark A.; Elber, Ashley G.; Riddell, Kimberly R.; Gellner, Terry M.

    2011-01-01

    Membrane bioreactors (MBR), used for wastewater treatment in Ohio and elsewhere in the United States, have pore sizes small enough to theoretically reduce concentrations of protozoa and bacteria, but not viruses. Sampling for viruses in wastewater is seldom done and not required. Instead, the bacterial indicators Escherichia coli (E. coli) and fecal coliforms are the required microbial measures of effluents for wastewater-discharge permits. Information is needed on the effectiveness of MBRs in removing human enteric viruses from wastewaters, particularly as compared to conventional wastewater treatment before and after disinfection. A total of 73 regular and 28 quality-control (QC) samples were collected at three MBR and two conventional wastewater plants in Ohio during 23 regular and 3 QC sampling trips in 2008-10. Samples were collected at various stages in the treatment processes and analyzed for bacterial indicators E. coli, fecal coliforms, and enterococci by membrane filtration; somatic and F-specific coliphage by the single agar layer (SAL) method; adenovirus, enterovirus, norovirus GI and GII, rotavirus, and hepatitis A virus by molecular methods; and viruses by cell culture. While addressing the main objective of the study-comparing removal of viruses and bacterial indicators in MBR and conventional plants-it was realized that work was needed to identify data analysis and quantification methods for interpreting enteric virus and QC data. Therefore, methods for quantifying viruses, qualifying results, and applying QC data to interpretations are described in this report. During each regular sampling trip, samples were collected (1) before conventional or MBR treatment (post-preliminary), (2) after secondary or MBR treatment (post-secondary or post-MBR), (3) after tertiary treatment (one conventional plant only), and (4) after disinfection (post-disinfection). Glass-wool fiber filtration was used to concentrate enteric viruses from large volumes, and small

  10. Quality control methods for linear accelerator radiation and mechanical axes alignment.

    Science.gov (United States)

    Létourneau, Daniel; Keller, Harald; Becker, Nathan; Amin, Md Nurul; Norrlinger, Bernhard; Jaffray, David A

    2018-06-01

    The delivery accuracy of highly conformal dose distributions generated using intensity modulation and collimator, gantry, and couch degrees of freedom is directly affected by the quality of the alignment between the radiation beam and the mechanical axes of a linear accelerator. For this purpose, quality control (QC) guidelines recommend a tolerance of ±1 mm for the coincidence of the radiation and mechanical isocenters. Traditional QC methods for assessment of radiation and mechanical axes alignment (based on pointer alignment) are time consuming and complex tasks that provide limited accuracy. In this work, an automated test suite based on an analytical model of the linear accelerator motions was developed to streamline the QC of radiation and mechanical axes alignment. The proposed method used the automated analysis of megavoltage images of two simple task-specific phantoms acquired at different linear accelerator settings to determine the coincidence of the radiation and mechanical isocenters. The sensitivity and accuracy of the test suite were validated by introducing actual misalignments on a linear accelerator between the radiation axis and the mechanical axes using both beam steering and mechanical adjustments of the gantry and couch. The validation demonstrated that the new QC method can detect sub-millimeter misalignment between the radiation axis and the three mechanical axes of rotation. A displacement of the radiation source of 0.2 mm using beam steering parameters was easily detectable with the proposed collimator rotation axis test. Mechanical misalignments of the gantry and couch rotation axes of the same magnitude (0.2 mm) were also detectable using the new gantry and couch rotation axis tests. For the couch rotation axis, the phantom and test design allow detection of both translational and tilt misalignments with the radiation beam axis. For the collimator rotation axis, the test can isolate the misalignment between the beam radiation axis

  11. SPECT quality control tests

    International Nuclear Information System (INIS)

    Robilotta, C.C.; Rebelo, M.F.S.; Oliveira, M.A.; Abe, R.

    1987-01-01

    Quality control tests of tomographic system composed by a rotatory chamber (CGR Gammatomome T-9000) and a microcomputer are presented. Traditional quality control tests for scintilation chambers and specific tests for tomographic systems are reported. (M.A.C.) [pt

  12. Masking as an effective quality control method for next-generation sequencing data analysis.

    Science.gov (United States)

    Yun, Sajung; Yun, Sijung

    2014-12-13

    Next generation sequencing produces base calls with low quality scores that can affect the accuracy of identifying simple nucleotide variation calls, including single nucleotide polymorphisms and small insertions and deletions. Here we compare the effectiveness of two data preprocessing methods, masking and trimming, and the accuracy of simple nucleotide variation calls on whole-genome sequence data from Caenorhabditis elegans. Masking substitutes low quality base calls with 'N's (undetermined bases), whereas trimming removes low quality bases that results in a shorter read lengths. We demonstrate that masking is more effective than trimming in reducing the false-positive rate in single nucleotide polymorphism (SNP) calling. However, both of the preprocessing methods did not affect the false-negative rate in SNP calling with statistical significance compared to the data analysis without preprocessing. False-positive rate and false-negative rate for small insertions and deletions did not show differences between masking and trimming. We recommend masking over trimming as a more effective preprocessing method for next generation sequencing data analysis since masking reduces the false-positive rate in SNP calling without sacrificing the false-negative rate although trimming is more commonly used currently in the field. The perl script for masking is available at http://code.google.com/p/subn/. The sequencing data used in the study were deposited in the Sequence Read Archive (SRX450968 and SRX451773).

  13. A simple and sensitive quality control method of the anaerobic atmosphere for identification and antimicrobial susceptibility testing of anaerobic bacteria

    DEFF Research Database (Denmark)

    Justesen, Tage; Justesen, Ulrik Stenz

    2013-01-01

    The maintenance of a strict anaerobic atmosphere is essential for the culture of strict anaerobic bacteria. We describe a simple and sensitive quality control method of the anaerobic atmosphere, based on the measurement of the zone diameter around a 5-μg metronidazole disk when testing...... an aerotolerant Clostridium perfringens strain. A zone diameter above 27 mm was indicative of acceptable anaerobic conditions....

  14. Quality control methods in accelerometer data processing: defining minimum wear time.

    Directory of Open Access Journals (Sweden)

    Carly Rich

    Full Text Available BACKGROUND: When using accelerometers to measure physical activity, researchers need to determine whether subjects have worn their device for a sufficient period to be included in analyses. We propose a minimum wear criterion using population-based accelerometer data, and explore the influence of gender and the purposeful inclusion of children with weekend data on reliability. METHODS: Accelerometer data obtained during the age seven sweep of the UK Millennium Cohort Study were analysed. Children were asked to wear an ActiGraph GT1M accelerometer for seven days. Reliability coefficients(r of mean daily counts/minute were calculated using the Spearman-Brown formula based on the intraclass correlation coefficient. An r of 1.0 indicates that all the variation is between- rather than within-children and that measurement is 100% reliable. An r of 0.8 is often regarded as acceptable reliability. Analyses were repeated on data from children who met different minimum daily wear times (one to 10 hours and wear days (one to seven days. Analyses were conducted for all children, separately for boys and girls, and separately for children with and without weekend data. RESULTS: At least one hour of wear time data was obtained from 7,704 singletons. Reliability increased as the minimum number of days and the daily wear time increased. A high reliability (r = 0.86 and sample size (n = 6,528 was achieved when children with ≥ two days lasting ≥10 hours/day were included in analyses. Reliability coefficients were similar for both genders. Purposeful sampling of children with weekend data resulted in comparable reliabilities to those calculated independent of weekend wear. CONCLUSION: Quality control procedures should be undertaken before analysing accelerometer data in large-scale studies. Using data from children with ≥ two days lasting ≥10 hours/day should provide reliable estimates of physical activity. It's unnecessary to include only children

  15. A Quadrupole Dalton-based multi-attribute method for product characterization, process development, and quality control of therapeutic proteins.

    Science.gov (United States)

    Xu, Weichen; Jimenez, Rod Brian; Mowery, Rachel; Luo, Haibin; Cao, Mingyan; Agarwal, Nitin; Ramos, Irina; Wang, Xiangyang; Wang, Jihong

    2017-10-01

    During manufacturing and storage process, therapeutic proteins are subject to various post-translational modifications (PTMs), such as isomerization, deamidation, oxidation, disulfide bond modifications and glycosylation. Certain PTMs may affect bioactivity, stability or pharmacokinetics and pharmacodynamics profile and are therefore classified as potential critical quality attributes (pCQAs). Identifying, monitoring and controlling these PTMs are usually key elements of the Quality by Design (QbD) approach. Traditionally, multiple analytical methods are utilized for these purposes, which is time consuming and costly. In recent years, multi-attribute monitoring methods have been developed in the biopharmaceutical industry. However, these methods combine high-end mass spectrometry with complicated data analysis software, which could pose difficulty when implementing in a quality control (QC) environment. Here we report a multi-attribute method (MAM) using a Quadrupole Dalton (QDa) mass detector to selectively monitor and quantitate PTMs in a therapeutic monoclonal antibody. The result output from the QDa-based MAM is straightforward and automatic. Evaluation results indicate this method provides comparable results to the traditional assays. To ensure future application in the QC environment, this method was qualified according to the International Conference on Harmonization (ICH) guideline and applied in the characterization of drug substance and stability samples. The QDa-based MAM is shown to be an extremely useful tool for product and process characterization studies that facilitates facile understanding of process impact on multiple quality attributes, while being QC friendly and cost-effective.

  16. A quality improvement project using statistical process control methods for type 2 diabetes control in a resource-limited setting.

    Science.gov (United States)

    Flood, David; Douglas, Kate; Goldberg, Vera; Martinez, Boris; Garcia, Pablo; Arbour, MaryCatherine; Rohloff, Peter

    2017-08-01

    Quality improvement (QI) is a key strategy for improving diabetes care in low- and middle-income countries (LMICs). This study reports on a diabetes QI project in rural Guatemala whose primary aim was to improve glycemic control of a panel of adult diabetes patients. Formative research suggested multiple areas for programmatic improvement in ambulatory diabetes care. This project utilized the Model for Improvement and Agile Global Health, our organization's complementary healthcare implementation framework. A bundle of improvement activities were implemented at the home, clinic and institutional level. Control charts of mean hemoglobin A1C (HbA1C) and proportion of patients meeting target HbA1C showed improvement as special cause variation was identified 3 months after the intervention began. Control charts for secondary process measures offered insights into the value of different components of the intervention. Intensity of home-based diabetes education emerged as an important driver of panel glycemic control. Diabetes QI work is feasible in resource-limited settings in LMICs and can improve glycemic control. Statistical process control charts are a promising methodology for use with panels or registries of diabetes patients. © The Author 2017. Published by Oxford University Press in association with the International Society for Quality in Health Care. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

  17. Quality control of labelled compounds

    International Nuclear Information System (INIS)

    Matucha, M.

    1979-01-01

    Some advantages and disadvantages of methods used for quality control of organic labelled compounds (1 31 I, 14 C) are shortly discussed. The methods used are electrophoresis, ultraviolet and infrared spectrometry, radiogas and thin-layer chromatography. (author)

  18. Methods for the computerized control of nuclear power plants for improved safety, quality, and productivity

    International Nuclear Information System (INIS)

    Heising, C.D.

    1988-12-01

    The purpose of this research project was to translate the Total Quality Control (TQC) management system to the operation of nuclear power plants. This work began on September 30, 1986 and continued through December 30, 1988 at an original funding level of $251,000. Four graduate research assistants were employed during the two year project period, with all four completing master's level degree theses or projects. In addition, several papers were presented at technical conferences regarding this work. Currently, one paper has been accepted for publication in the journal of Operations Research, and two more papers are currently being written for submission in the near future. The project also received favorable publicity at the university and elsewhere. The major findings of this work was that, indeed, the Japanese management system of Total Quality Control (TQC) may be applied to nuclear power plant operation to achieve enhanced safety and increased efficiency. Two utilities are already heavily engaged in implementing TQC at their nuclear power plants: the Kansai Electric Company of Osaka, Japan and the Florida Power and Light Company of Miami, Florida. We have documented in detail the progress of these utilities in their attempts to implement TQC, as well as highlighting ''success stories'' of TQC implementation in other industries

  19. Population-based cancer survival in the United States: Data, quality control, and statistical methods.

    Science.gov (United States)

    Allemani, Claudia; Harewood, Rhea; Johnson, Christopher J; Carreira, Helena; Spika, Devon; Bonaventure, Audrey; Ward, Kevin; Weir, Hannah K; Coleman, Michel P

    2017-12-15

    Robust comparisons of population-based cancer survival estimates require tight adherence to the study protocol, standardized quality control, appropriate life tables of background mortality, and centralized analysis. The CONCORD program established worldwide surveillance of population-based cancer survival in 2015, analyzing individual data on 26 million patients (including 10 million US patients) diagnosed between 1995 and 2009 with 1 of 10 common malignancies. In this Cancer supplement, we analyzed data from 37 state cancer registries that participated in the second cycle of the CONCORD program (CONCORD-2), covering approximately 80% of the US population. Data quality checks were performed in 3 consecutive phases: protocol adherence, exclusions, and editorial checks. One-, 3-, and 5-year age-standardized net survival was estimated using the Pohar Perme estimator and state- and race-specific life tables of all-cause mortality for each year. The cohort approach was adopted for patients diagnosed between 2001 and 2003, and the complete approach for patients diagnosed between 2004 and 2009. Articles in this supplement report population coverage, data quality indicators, and age-standardized 5-year net survival by state, race, and stage at diagnosis. Examples of tables, bar charts, and funnel plots are provided in this article. Population-based cancer survival is a key measure of the overall effectiveness of services in providing equitable health care. The high quality of US cancer registry data, 80% population coverage, and use of an unbiased net survival estimator ensure that the survival trends reported in this supplement are robustly comparable by race and state. The results can be used by policymakers to identify and address inequities in cancer survival in each state and for the United States nationally. Cancer 2017;123:4982-93. Published 2017. This article is a U.S. Government work and is in the public domain in the USA. Published 2017. This article is a U

  20. A method for evaluating treatment quality using in vivo EPID dosimetry and statistical process control in radiation therapy.

    Science.gov (United States)

    Fuangrod, Todsaporn; Greer, Peter B; Simpson, John; Zwan, Benjamin J; Middleton, Richard H

    2017-03-13

    Purpose Due to increasing complexity, modern radiotherapy techniques require comprehensive quality assurance (QA) programmes, that to date generally focus on the pre-treatment stage. The purpose of this paper is to provide a method for an individual patient treatment QA evaluation and identification of a "quality gap" for continuous quality improvement. Design/methodology/approach A statistical process control (SPC) was applied to evaluate treatment delivery using in vivo electronic portal imaging device (EPID) dosimetry. A moving range control chart was constructed to monitor the individual patient treatment performance based on a control limit generated from initial data of 90 intensity-modulated radiotherapy (IMRT) and ten volumetric-modulated arc therapy (VMAT) patient deliveries. A process capability index was used to evaluate the continuing treatment quality based on three quality classes: treatment type-specific, treatment linac-specific, and body site-specific. Findings The determined control limits were 62.5 and 70.0 per cent of the χ pass-rate for IMRT and VMAT deliveries, respectively. In total, 14 patients were selected for a pilot study the results of which showed that about 1 per cent of all treatments contained errors relating to unexpected anatomical changes between treatment fractions. Both rectum and pelvis cancer treatments demonstrated process capability indices were less than 1, indicating the potential for quality improvement and hence may benefit from further assessment. Research limitations/implications The study relied on the application of in vivo EPID dosimetry for patients treated at the specific centre. Sampling patients for generating the control limits were limited to 100 patients. Whilst the quantitative results are specific to the clinical techniques and equipment used, the described method is generally applicable to IMRT and VMAT treatment QA. Whilst more work is required to determine the level of clinical significance, the

  1. Quality assurance and quality control

    International Nuclear Information System (INIS)

    Anon.

    1987-01-01

    The practice of nuclear diagnostic imaging requires an appropriate quality assurance program to attain high standards of efficiency and reliability. The International Atomic Energy Agency defines the term quality assurance as ''the closeness with which the outcome of a given procedure approaches some ideal, free from all errors and artifacts.'' The term quality control is used in reference to the specific measures taken to ensure that one particular aspect of the procedure is satisfactory. Therefore, quality assurance is a hospital-wide concept that should involve all aspects of clinical practice. Quality control is concerned with the submission of requests for procedures; the scheduling of patients; the preparation and dispensing of radiopharmaceuticals; the protection of patients, staff, and the general public against radiation hazards and accidents caused by radioactive materials or by faulty equipment; the setting up, use, and maintenance of electronic instruments; the methodology of the actual procedures; the analysis and interpretation of data; the reporting of results; and, finally, the keeping of records. The chapter discusses each of these areas

  2. Quality control in radiotherapy

    International Nuclear Information System (INIS)

    Batalla, A.

    2009-01-01

    The authors discuss the modalities and periodicities of internal quality control on radiotherapy installations. They indicate the different concerned systems and the aspects and items to be controlled (patient and personnel security, apparatus mechanical characteristics, beam quality, image quality, isodose and irradiation duration calculation, data transfer). They present the measurement instruments and tools used for the mechanical controls, dose measurement, beam homogeneity and symmetry, anatomic data acquisition systems, and dose distribution and control imagery calculation

  3. Applying probabilistic temporal and multisite data quality control methods to a public health mortality registry in Spain: a systematic approach to quality control of repositories.

    Science.gov (United States)

    Sáez, Carlos; Zurriaga, Oscar; Pérez-Panadés, Jordi; Melchor, Inma; Robles, Montserrat; García-Gómez, Juan M

    2016-11-01

    To assess the variability in data distributions among data sources and over time through a case study of a large multisite repository as a systematic approach to data quality (DQ). Novel probabilistic DQ control methods based on information theory and geometry are applied to the Public Health Mortality Registry of the Region of Valencia, Spain, with 512 143 entries from 2000 to 2012, disaggregated into 24 health departments. The methods provide DQ metrics and exploratory visualizations for (1) assessing the variability among multiple sources and (2) monitoring and exploring changes with time. The methods are suited to big data and multitype, multivariate, and multimodal data. The repository was partitioned into 2 probabilistically separated temporal subgroups following a change in the Spanish National Death Certificate in 2009. Punctual temporal anomalies were noticed due to a punctual increment in the missing data, along with outlying and clustered health departments due to differences in populations or in practices. Changes in protocols, differences in populations, biased practices, or other systematic DQ problems affected data variability. Even if semantic and integration aspects are addressed in data sharing infrastructures, probabilistic variability may still be present. Solutions include fixing or excluding data and analyzing different sites or time periods separately. A systematic approach to assessing temporal and multisite variability is proposed. Multisite and temporal variability in data distributions affects DQ, hindering data reuse, and an assessment of such variability should be a part of systematic DQ procedures. © The Author 2016. Published by Oxford University Press on behalf of the American Medical Informatics Association. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  4. Kaizen method for esophagectomy patients: improved quality control, outcomes, and decreased costs.

    Science.gov (United States)

    Iannettoni, Mark D; Lynch, William R; Parekh, Kalpaj R; McLaughlin, Kelley A

    2011-04-01

    The majority of costs associated with esophagectomy are related to the initial 3 days of hospital stay requiring intensive care unit stays, ventilator support, and intraoperative time. Additional costs arise from hospital-based services. The major cost increases are related to complications associated with the procedure. We attempted to define these costs and identify expense management by streamlining care through strict adherence to patient care maps, operative standardization, and rapid discharge planning to reduce variability. Utilizing methods of Kaizen philosophy we evaluated all processes related to the entire experience of esophageal resection. This process has taken over 5 years to achieve, with quality and cost being tracked over this time period. Cost analysis included expenses related to intensive care unit, anesthesia, disposables, and hospital services. Quality improvement measures were related to intraoperative complications, in-hospital complications, and postoperative outcomes. The Institutional Review Board approved the use of anonymous data from standard clinical practice because no additional treatment was planned (observational study). Utilizing a continuous process improvement methodology, a 43% reduction in cost per case has been achieved with a significant increase in contribution margin for esophagectomy. The length of stay has been reduced from 14 days to 5. With intraoperative and postoperative standardization the leak rate has dropped from 12% to less than 3% to no leaks in our current Kaizen modification of care in our last 64 patients. Utilizing lean manufacturing techniques and continuous process evaluation we have attempted to eliminate variability, standardized the phases of care resulting in improved outcomes, decreased length of stay, and improved contribution margins. These Kaizen improvements require continuous interventions, strict adherence to care maps, and input from all levels for quality improvements. Copyright © 2011 The

  5. Comparison of HTGR fuel design, manufacture and quality control methods between Japan and China

    International Nuclear Information System (INIS)

    Fu Xioming; Takahashi, Masashi; Ueta, Shouhei; Sawa, Kazuhiro

    2002-05-01

    The first-loading fuel for the HTTR was started to fabricate at Nuclear Fuel Industries (NFI) in 1995 and the HTTR reached criticality in 1998. Meanwhile, 10 MW high temperature reactor (HTR-10) was constructed in Institute of Nuclear Energy Technology (INET) of Tsinghua University, and the first-loading fuel was fabricated concurrently. The HTR-10 reached criticality in December 2000. Though fuel type is different, i.e., pin-in-block type for the HTTR and pebble bed type for the HTR-10, the fabrication method of TRISO coated fuel particles is similar to each other. This report describes comparison of fuel design, fabrication process and quality inspection between them. (author)

  6. Software product quality control

    CERN Document Server

    Wagner, Stefan

    2013-01-01

    Quality is not a fixed or universal property of software; it depends on the context and goals of its stakeholders. Hence, when you want to develop a high-quality software system, the first step must be a clear and precise specification of quality. Yet even if you get it right and complete, you can be sure that it will become invalid over time. So the only solution is continuous quality control: the steady and explicit evaluation of a product's properties with respect to its updated quality goals.This book guides you in setting up and running continuous quality control in your environment. Star

  7. Bootstrap Signal-to-Noise Confidence Intervals: An Objective Method for Subject Exclusion and Quality Control in ERP Studies

    Science.gov (United States)

    Parks, Nathan A.; Gannon, Matthew A.; Long, Stephanie M.; Young, Madeleine E.

    2016-01-01

    Analysis of event-related potential (ERP) data includes several steps to ensure that ERPs meet an appropriate level of signal quality. One such step, subject exclusion, rejects subject data if ERP waveforms fail to meet an appropriate level of signal quality. Subject exclusion is an important quality control step in the ERP analysis pipeline as it ensures that statistical inference is based only upon those subjects exhibiting clear evoked brain responses. This critical quality control step is most often performed simply through visual inspection of subject-level ERPs by investigators. Such an approach is qualitative, subjective, and susceptible to investigator bias, as there are no standards as to what constitutes an ERP of sufficient signal quality. Here, we describe a standardized and objective method for quantifying waveform quality in individual subjects and establishing criteria for subject exclusion. The approach uses bootstrap resampling of ERP waveforms (from a pool of all available trials) to compute a signal-to-noise ratio confidence interval (SNR-CI) for individual subject waveforms. The lower bound of this SNR-CI (SNRLB) yields an effective and objective measure of signal quality as it ensures that ERP waveforms statistically exceed a desired signal-to-noise criterion. SNRLB provides a quantifiable metric of individual subject ERP quality and eliminates the need for subjective evaluation of waveform quality by the investigator. We detail the SNR-CI methodology, establish the efficacy of employing this approach with Monte Carlo simulations, and demonstrate its utility in practice when applied to ERP datasets. PMID:26903849

  8. Dynamic controlled atmosphere (DCA): interaction between DCA methods and 1-methylcyclopropene on 'Fuji Suprema' apple quality.

    Science.gov (United States)

    Weber, Anderson; Thewes, Fabio Rodrigo; Anese, Rogerio de Oliveira; Both, Vanderlei; Pavanello, Elizandra Pivotto; Brackmann, Auri

    2017-11-15

    The objective of the present work was to evaluate the appropriate respiratory quotient (RQ) value to achieve a safe lowest oxygen limit (LOL), during storage of 'Fuji Suprema' apples, in dynamic controlled atmosphere (DCA), treated with or without 1-methylcyclopropene (1-MCP). The apples were stored in DCA-RQ, a new technology for storing fruits, and were compared with the HarvestWatch™, a system based on chlorophyll fluorescence DCA (DCA-CF), and static controlled atmosphere. DCA-RQ1.5 is the most suited for the storage of 'Fuji Suprema' apples. In this condition fermentative products were induced, which reduced ethylene production and respiration rate; however, it did not increase physiological disorders, and the concentration of ethyl acetate was below the odour threshold. 1-MCP application maintained higher flesh firmness and reduced the anaerobic metabolism, although it decreased fruit quality due to the occurrence of cavities, therefore its application is not recommended for 'Fuji Suprema' apple stored in DCA conditions. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. High oleic sunflower bio diesel: quality control and different purification methods

    Energy Technology Data Exchange (ETDEWEB)

    Pighlinelli, A. L. M. T.; Ferrari, R. A.; Miguel, A. M. R. O.; Park, K. J.

    2011-07-01

    The objective of the present work is to evaluate the production of bio diesel using ethanol and sunflower oil. The extraction of the sunflower oil was evaluated first. An experimental design was used to estimate the influence of the independent variables grain temperature (25 degree centigrade to 110 degree centigrade) and expelled rotation (85 to 119rpm) on the crude oil. The best result obtained was 68.38%, achieved with a rotation from 100 to 115rpm, grain temperature ranging from 25 degree centigrade to 30 degree centigrade and moisture content of around 7%. The next study consisted of transesterification, evaluating the influence of the ethanol, oil molar ratio and the catalyst concentration (sodium methylate) on the ester-rich phase yield. The highest yield was 98.39% obtained with a molar ratio of 9:1 and 3% catalyst. An experiment was then carried out on a small reactor and the bio diesel produced was purified by three different methods: acidified water, silica and distillation. The quality aspects of the purified bio diesel samples were evaluated according to the Brazilian specifications for bio diesel, and distillation was shown to be the best method of purification. (Author) 28 refs.

  10. Quality control in urinalysis.

    Science.gov (United States)

    Takubo, T; Tatsumi, N

    1999-01-01

    Quality control (QC) has been introduced in laboratories, and QC surveys in urinalysis have been performed by College of American Pathologist, by Japanese Association of Medical Technologists, by Osaka Medical Association and by manufacturers. QC survey in urinalysis for synthetic urine by the reagent strip and instrument made in same manufacturer, and by an automated urine cell analyser provided satisfactory results among laboratories. QC survey in urinalysis for synthetic urine by the reagent strips and instruments made by various manufacturers indicated differences in the determination values among manufacturers, and between manual and automated methods because the reagent strips and instruments have different characteristics, respectively. QC photo survey in urinalysis on the microscopic photos of urine sediment constituents indicated differences in the identification of cells among laboratories. From the results, it is necessary to standardize a reagent strip method, manual and automated methods, and synthetic urine.

  11. Advanced methods of process/quality control in nuclear reactor fuel manufacture. Proceedings of a technical committee meeting

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    Nuclear fuel plays an essential role in ensuring the competitiveness of nuclear energy and its acceptance by the public. The economic and market situation is not favorable at present for nuclear fuel designers and suppliers. The reduction in fuel prices (mainly to compete with fossil fuels) and in the number of fuel assemblies to be delivered to customers (mainly due to burnup increase) has been offset by the rising number of safety and other requirements, e.g. the choice of fuel and structural materials and the qualification of equipment. In this respect, higher burnup and thermal rates, longer fuel cycles and the use of MOX fuels are the real means to improve the economics of the nuclear fuel cycle as a whole. Therefore, utilities and fuel vendors have recently initiated new research and development programmes aimed at improving fuel quality, design and materials to produce robust and reliable fuel for safe and reliable reactor operation more demanding conditions. In this connection, improvement of fuel quality occupies an important place and this requires continuous effort on the part of fuel researchers, designers and producers. In the early years of commercial fuel fabrication, emphasis was given to advancements in quality control/quality assurance related mainly to the product itself. Now, the emphasis is transferred to improvements in process control and to implementation of overall total quality management (TQM) programmes. In the area of fuel quality control, statistical methods are now widely implemented, replacing 100% inspection. The IAEA, recognizing the importance of obtaining and maintaining high standards in fuel fabrication, has paid particular attention to this subject. In response to the rapid progress in development and implementation of advanced methods of process/quality control in nuclear fuel manufacture and on the recommendation of the International Working Group on Water Reactor Fuel Performance and Technology, the IAEA conducted a

  12. Advanced methods of process/quality control in nuclear reactor fuel manufacture. Proceedings of a technical committee meeting

    International Nuclear Information System (INIS)

    2000-07-01

    Nuclear fuel plays an essential role in ensuring the competitiveness of nuclear energy and its acceptance by the public. The economic and market situation is not favorable at present for nuclear fuel designers and suppliers. The reduction in fuel prices (mainly to compete with fossil fuels) and in the number of fuel assemblies to be delivered to customers (mainly due to burnup increase) has been offset by the rising number of safety and other requirements, e.g. the choice of fuel and structural materials and the qualification of equipment. In this respect, higher burnup and thermal rates, longer fuel cycles and the use of MOX fuels are the real means to improve the economics of the nuclear fuel cycle as a whole. Therefore, utilities and fuel vendors have recently initiated new research and development programmes aimed at improving fuel quality, design and materials to produce robust and reliable fuel for safe and reliable reactor operation more demanding conditions. In this connection, improvement of fuel quality occupies an important place and this requires continuous effort on the part of fuel researchers, designers and producers. In the early years of commercial fuel fabrication, emphasis was given to advancements in quality control/quality assurance related mainly to the product itself. Now, the emphasis is transferred to improvements in process control and to implementation of overall total quality management (TQM) programmes. In the area of fuel quality control, statistical methods are now widely implemented, replacing 100% inspection. The IAEA, recognizing the importance of obtaining and maintaining high standards in fuel fabrication, has paid particular attention to this subject. In response to the rapid progress in development and implementation of advanced methods of process/quality control in nuclear fuel manufacture and on the recommendation of the International Working Group on Water Reactor Fuel Performance and Technology, the IAEA conducted a

  13. Checking quality control?

    DEFF Research Database (Denmark)

    Brodersen, Lars

    2005-01-01

    How is quality control doing within the community of GIS, web-services based on geo-information, GI etc.?......How is quality control doing within the community of GIS, web-services based on geo-information, GI etc.?...

  14. An alternative method for noise analysis using pixel variance as part of quality control procedures on digital mammography systems

    International Nuclear Information System (INIS)

    Bouwman, R; Broeders, M; Van Engen, R; Young, K; Lazzari, B; Ravaglia, V

    2009-01-01

    According to the European Guidelines for quality assured breast cancer screening and diagnosis, noise analysis is one of the measurements that needs to be performed as part of quality control procedures on digital mammography systems. However, the method recommended in the European Guidelines does not discriminate sufficiently between systems with and without additional noise besides quantum noise. This paper attempts to give an alternative and relatively simple method for noise analysis which can divide noise into electronic noise, structured noise and quantum noise. Quantum noise needs to be the dominant noise source in clinical images for optimal performance of a digital mammography system, and therefore the amount of electronic and structured noise should be minimal. For several digital mammography systems, the noise was separated into components based on the measured pixel value, standard deviation (SD) of the image and the detector entrance dose. The results showed that differences between systems exist. Our findings confirm that the proposed method is able to discriminate systems based on their noise performance and is able to detect possible quality problems. Therefore, we suggest to replace the current method for noise analysis as described in the European Guidelines by the alternative method described in this paper.

  15. Controlling coarse woody debris inventory quality: taper and relative size methods

    Science.gov (United States)

    C.W. Woodall; J.A. Westfall

    2008-01-01

    Accurately measuring the dimensions of coarse woody debris (CWD) is critical for ensuring the quality of CWD estimates and, hence, for accurately estimating forest ecosystem attributes (e.g., CWD carbon stocks). To improve the quality of CWD dimensional measurements, the distribution of taper (ratio of change in diameter and length) and relative size (RS; ratio of...

  16. Quality Control Assays for Clinical-Grade Human Mesenchymal Stromal Cells: Methods for ATMP Release.

    Science.gov (United States)

    Radrizzani, Marina; Soncin, Sabrina; Lo Cicero, Viviana; Andriolo, Gabriella; Bolis, Sara; Turchetto, Lucia

    2016-01-01

    Mesenchymal stromal/stem cells (MSC) are promising candidates for the development of cell-based therapies for various diseases and are currently being evaluated in a number of clinical trials (Sharma et al., Transfusion 54:1418-1437, 2014; Ikebe and Suzuki, Biomed Res Int 2014:951512, 2014). MSC for therapeutic applications are classified as advanced therapy medicinal products (ATMP) (Regulation (EC) No 1394/2007 of the European Parliament and of the Council of 13 November 2007 on advanced therapy medicinal products and amending Directive 2001/83/EC and Regulation (EC) No 726/2004) and must be prepared according to good manufacturing practices ( http://ec.europa.eu/health/documents/eudralex/vol-4 ). They may be derived from different starting materials (mainly bone marrow (BM), adipose tissue, or cord blood) and applied as fresh or cryopreserved products, in the autologous as well as an allogeneic context (Sharma et al., Transfusion 54:1418-1437, 2014; Ikebe and Suzuki, Biomed Res Int 2014:951512, 2014; Sensebé and Bourin, Transplantation 87(9 Suppl):S49-S53, 2009). In any case, they require an approved and well-defined panel of assays in order to be released for clinical use.This chapter describes analytical methods implemented and performed in our cell factory as part of the release strategy for an ATMP consisting of frozen autologous BM-derived MSC. Such methods are designed to assess the safety (sterility, endotoxin, and mycoplasma assays) and identity/potency (cell count and viability, immunophenotype and clonogenic assay) of the final product. Some assays are also applied to the biological starting material (sterility) or carried out as in-process controls (sterility, cell count and viability, immunophenotype, clonogenic assay).The validation strategy for each analytical method is described in the accompanying Chapter 20 .

  17. GC-C-IRMS in routine doping control practice: 3 years of drug testing data, quality control and evolution of the method.

    Science.gov (United States)

    Polet, Michael; Van Eenoo, Peter

    2015-06-01

    In order to detect the misuse of endogenous anabolic steroids, doping control laboratories require methods that allow differentiation between endogenous steroids and their synthetic copies. Gas chromatography combustion isotope ratio mass spectrometry (GC-C-IRMS) is capable of measuring the carbon isotope ratio of urinary steroids and this allows differentiation between both. GC-C-IRMS and its application to doping control has evolved a lot during the last decade and so have the World Anti-Doping Agency (WADA) technical documents that describe how GC-C-IRMS should be applied. Especially the WADA technical document of 2014 introduced a number of obligatory quality controls and a fixed methodology that should be used by all the doping control laboratories. This document imposed more uniform methods between the laboratories in order to decrease the interlaboratory standard deviation and acquire similar results for the analysis of the same urine samples. In this paper, 3 years of drug testing data of our GC-C-IRMS method in routine doping control practice is described, with an emphasis on the new WADA technical document and its implementation. Useful data for other doping control laboratories is presented focussing on general method setup, quality control and data collected from routine samples. The paper concentrates on how IRMS results shift or remain similar by switching to the 2014 WADA technical document and gives insight in a straightforward approach to calculate the measurement uncertainty.

  18. Plastic Injection Quality Controlling Using the Lean Six Sigma and FMEA Method

    Science.gov (United States)

    Mansur, A.; Mu'alim; Sunaryo

    2016-01-01

    PT. Yogya Presisi Teknikatama Industri (PT. YPTI) is a mold, precision part, and plastic injection maker company. One of the obstacles faced by the company is the high level of nonconformity on its production results. The waste on production process can be identified and classified into four types, i.e.: a). during the process of injection molding machines, b). finishing and cutting processes, c). quality control process and d). the packaging process. The objectives of this research are minimizing the defective goods and reducing the waste using Lean Six Sigma and FMEA approaches, especially for Bush product. From the analysis result, defective types on Bush product can be classified into bubble, speckle, short shoot, sunken, sink mark, over-cut, flashing, and discolor. Based on the attributes data on Bush product, the DPMO score is 988.42 or the sigma level is 4.6, While the DPMO score on the variable data on each dimension i.e.: a). Slit width on the bottom side has DPMO score of 30119 (sigma level 3.37), b). Diameter of the circle on the top side has DPMO score of 392294 (sigma level 1.77), c). Product thickness on the top side has DPMO score of 70474 (sigma level 2.97), d). Product height has DPMO score of 82107 (sigma level 2.89), product thickness on the bottom side has DPMO score of 24448 (sigma level 3.47), and f). Diameter of the circle on the bottom side has DPMO score of 24448 (sigma level 3.47). The highest RPN score on the dominant types of product defects which needs improvement are the defective goods of bubble type has RPN score of 729, flashing and the molten material out on the heating channel has RPN score of 384, over cutting has RPN score of 324 and sink mark has RPN score of 270. The recommendations for improvement that can be given from this research are making checklist for maintenance and production monitoring, enhancing work supervision and inspection, as well as improving the environment and work stations.

  19. A reliable method for the quality control of 99mTc-MIBI prepared using fractionated cardiolite kits

    International Nuclear Information System (INIS)

    Poot, M.T.; Varelis, P.

    1998-01-01

    Full text: The reconstitution of fractionated Cardiolite kits with Na[ 99m Tc]TcO 4 eluted from a wet-column generator results in a preparation that contains elevated amounts of a polar radiochemical impurity, which is normally present in only trace amounts when such kits are reconstituted with eluate from a dry-column generator. We demonstrate, using HPLC, that this impurity causes a positive bias in several reported quality control methods (TLC, ITLC and SPE) for 99m Tc-MIBI, including that recommended by the manufacturer (TLC). A rapid procedure, based on a C18 solid phase extraction (SPE) cartridge, for measuring the radiochemical purity (RCP) of 99m Tc-MIBI samples was developed and compared with three other methods including HPLC. Over a RCP range of 49-98%, the values obtained using our SPE method deviated from those obtained using HPLC by 1.1+1.395 (n=26). In conclusion our SPE method is a rapid and reliable means of quality controlling 99m Tc-MIBI

  20. A reliable method for the quality control of 99mTc-MIBI prepared using fractionated cardiolite kits

    Energy Technology Data Exchange (ETDEWEB)

    Poot, M.T.; Varelis, P. [St George Hospital, Sydney, NSW (Australia). Department of Nuclear Medicine

    1998-06-01

    Full text: The reconstitution of fractionated Cardiolite kits with Na[{sup 99m}Tc]TcO{sub 4} eluted from a wet-column generator results in a preparation that contains elevated amounts of a polar radiochemical impurity, which is normally present in only trace amounts when such kits are reconstituted with eluate from a dry-column generator. We demonstrate, using HPLC, that this impurity causes a positive bias in several reported quality control methods (TLC, ITLC and SPE) for {sup 99m}Tc-MIBI, including that recommended by the manufacturer (TLC). A rapid procedure, based on a C18 solid phase extraction (SPE) cartridge, for measuring the radiochemical purity (RCP) of {sup 99m}Tc-MIBI samples was developed and compared with three other methods including HPLC. Over a RCP range of 49-98%, the values obtained using our SPE method deviated from those obtained using HPLC by 1.1+1.395 (n=26). In conclusion our SPE method is a rapid and reliable means of quality controlling {sup 99m}Tc-MIBI

  1. Quality control of radiopharmaceuticals

    International Nuclear Information System (INIS)

    Verdera, E.S.

    1994-01-01

    The quality control of radiopharmaceuticals is based in physics, physics-chemical and biological controls. Between the different controls can be enumerated the following: visual aspect,side, number of particle beams,activity,purity,ph,isotonicity,sterility,radioinmunoessay,toxicity,stability and clinical essay

  2. Quality Control in construction.

    Science.gov (United States)

    1984-01-01

    behavioral scientists. In 1962, Dr. Kaoru Ishikawa gave shape to the form of training which featured intradepartmental groups of ten or so workers seated...and Japanese circles bears closer scrutiny. 4.3.1 Japanese Ingredients of Quality The founder of quality circles, Dr. Kaoru Ishikawa , gives six...around 51 a table; hence the name Quality Control Circle. 4 Dr. 0 Ishikawa was an engineering professor at Tokyo University, and the circles were

  3. Nuclear-geophysical methods as a basis of progressive technology of ore quality control in mining industry

    International Nuclear Information System (INIS)

    Mejer, V.A.

    1976-01-01

    The significance of nuclear physics methods in the mining industry is demonstrated using examples of applying the X-ray diffraction method to the delimitation of lead-zinc and tin ores in exploratory wells, faces of mine workings and to a quick estimation of metal contents in hacked-off rocks and market payable ore. Their implementation at all stages of the exploration and development of deposits would improve the extraction of ores and reduce losses of the raw material during technological treatment. Owing to the rapidity and operativeness of control over the quality of ores at all stages of geological prospecting and mining, nuclear physics methods can provide a basis for technological progress in the mining industry

  4. Characterization of ceramic materials - Some methods employed in quality control of nuclear fuels

    International Nuclear Information System (INIS)

    Cardoso, P.E.; Ferraz, W.B.; Lameiras, F.S.; Lopes, J.A.M.; Santos, A.M.M. dos; Ferreira, R.A.N.

    1986-01-01

    Measuring methods are presented for specific surface, density, open porosity and microstructure, such as bulk density of particles in form of nicrospheres, for characterization of ceramic materials used as nuclear fuels. Some of these methods are alternatives to those usually employed, and they present some advantages, such as economy, speed of execution, and accuracy. (Author) [pt

  5. [Application of FT-IR pattern recognition method for the quality control of pharmaceutical ingredients].

    Science.gov (United States)

    Horgos, József; Kóger, Péter; Zelkó, Romána

    2009-01-01

    Nowadays infrared spectroscopy and chemometrics have proven their effectiveness for both qualitative and quantitative analyses in different fields like agriculture, food, chemical and oil industry. Furier Transformation Infrared Spectroscopy (FT-IR) combined with Attenuated Total Reflectance (ATR) plate is a fast identification instrument. It is suitable for analysis of solid and liquid phase, too. Associated with chemometrics, it would be a powerful tool for the pharmaceutical wholesalers to detect the insufficient quality of pharmaceutical ingredients. In the present study beside the review of the infra red technology, pharmaceutical ingredients were examined with the help of our spectra library.

  6. SAQC: SNP Array Quality Control

    Directory of Open Access Journals (Sweden)

    Li Ling-Hui

    2011-04-01

    Full Text Available Abstract Background Genome-wide single-nucleotide polymorphism (SNP arrays containing hundreds of thousands of SNPs from the human genome have proven useful for studying important human genome questions. Data quality of SNP arrays plays a key role in the accuracy and precision of downstream data analyses. However, good indices for assessing data quality of SNP arrays have not yet been developed. Results We developed new quality indices to measure the quality of SNP arrays and/or DNA samples and investigated their statistical properties. The indices quantify a departure of estimated individual-level allele frequencies (AFs from expected frequencies via standardized distances. The proposed quality indices followed lognormal distributions in several large genomic studies that we empirically evaluated. AF reference data and quality index reference data for different SNP array platforms were established based on samples from various reference populations. Furthermore, a confidence interval method based on the underlying empirical distributions of quality indices was developed to identify poor-quality SNP arrays and/or DNA samples. Analyses of authentic biological data and simulated data show that this new method is sensitive and specific for the detection of poor-quality SNP arrays and/or DNA samples. Conclusions This study introduces new quality indices, establishes references for AFs and quality indices, and develops a detection method for poor-quality SNP arrays and/or DNA samples. We have developed a new computer program that utilizes these methods called SNP Array Quality Control (SAQC. SAQC software is written in R and R-GUI and was developed as a user-friendly tool for the visualization and evaluation of data quality of genome-wide SNP arrays. The program is available online (http://www.stat.sinica.edu.tw/hsinchou/genetics/quality/SAQC.htm.

  7. SU-C-BRD-01: A Statistical Modeling Method for Quality Control of Intensity- Modulated Radiation Therapy Planning

    International Nuclear Information System (INIS)

    Gao, S; Meyer, R; Shi, L; D'Souza, W; Zhang, H

    2014-01-01

    Purpose: To apply a statistical modeling approach, threshold modeling (TM), for quality control of intensity-modulated radiation therapy (IMRT) treatment plans. Methods: A quantitative measure, which was the weighted sum of violations of dose/dose-volume constraints, was first developed to represent the quality of each IMRT plan. Threshold modeling approach, which is is an extension of extreme value theory in statistics and is an effect way to model extreme values, was then applied to analyze the quality of the plans summarized by our quantitative measures. Our approach modeled the plans generated by planners as a series of independent and identically distributed random variables and described the behaviors of them if the plan quality was controlled below certain threshold. We tested our approach with five locally advanced head and neck cancer patients retrospectively. Two statistics were incorporated for numerical analysis: probability of quality improvement (PQI) of the plans and expected amount of improvement on the quantitative measure (EQI). Results: After clinical planners generated 15 plans for each patient, we applied our approach to obtain the PQI and EQI as if planners would generate additional 15 plans. For two of the patients, the PQI was significantly higher than the other three (0.17 and 0.18 comparing to 0.08, 0.01 and 0.01). The actual percentage of the additional 15 plans that outperformed the best of initial 15 plans was 20% and 27% comparing to 11%, 0% and 0%. EQI for the two potential patients were 34.5 and 32.9 and the rest of three patients were 9.9, 1.4 and 6.6. The actual improvements obtained were 28.3 and 20.5 comparing to 6.2, 0 and 0. Conclusion: TM is capable of reliably identifying the potential quality improvement of IMRT plans. It provides clinicians an effective tool to assess the trade-off between extra planning effort and achievable plan quality. This work was supported in part by NIH/NCI grant CA130814

  8. Quality control of radiopharmaceuticals

    International Nuclear Information System (INIS)

    Kristensen, K.

    1981-01-01

    Quality assurance was introduced in the pharmaceutical field long before it was used in many other areas, and the term quality control has been used in a much broader sense than merely analytical quality control. The term Good Manufacturing Practice (GMP) has been used to describe the system used for producing safe and effective drugs of a uniform quality. GMP has also been used for the industrial production of radiopharmaceuticals. For the preparation and control of radiopharmaceuticals in hospitals a similar system has been named Good Radiopharmacy Practice (GRP). It contains the same elements as GMP but takes into account the special nature of this group of drugs. Data on the assessment of the quality of radiopharmaceuticals in relation to present standards are reviewed. The general conclusion is that the quality of radiopharmaceuticals appears comparable to that of other drugs. It seems possible to establish the production of radiopharmaceuticals, generators and preparation kits in such a way that analytical control of the final product at the hospital may be limited provided the final preparation work is carried out in accordance with GRP principles. The elements of GRP are reviewed. (author)

  9. The efficacy of a continuous quality improvement (CQI) method in a radiological department: comparison with non-CQI control material

    International Nuclear Information System (INIS)

    Laurila, J.; Standertskjoeld-Nordenstam, C.G.; Suramo, I.; Tolppanen, E.M.; Tervonen, O.; Korhola, O.; Brommels, M.

    2000-01-01

    To study the efficacy of continuous quality improvement (CQI) compared to ordinary management in an on-duty radiology department. Because of complaints regarding delivery of on-duty radiological services, an improvement was initiated simultaneously at two hospitals, at the HUCH (Helsinki University Central Hospital) utilising the CQI-method, and at the OUH (Oulu University Hospital) with a traditional management process. For the CQI project, a team was formed to evaluate the process with flow-charts, cause and effect diagrams, Pareto analysis and control charts. Interventions to improve the process were based on the results of these analyses. The team at the HUCH implemented the following changes: A radiologist was added to the evening shift between 15:00 - 22:00 and a radiographer was moved from the morning shift to 15:00 - 22:00. A clear improvement was achieved in the turn-around time, but in the follow-up some of the gains were lost. Only minimal changes were achieved at the OUH, where the intervention was based on traditional management processes. CQI was an effective method for improving the quality of performance of a radiology department compared with ordinary management methods, but some of this improvement may be subsequently lost without a continuous measurement system

  10. Validation of analytical methods used in the quality control of biotechnology products

    Directory of Open Access Journals (Sweden)

    I. Rosales

    2012-06-01

    Full Text Available Las biotecnologías modernas, no solo se han ocupado del diseño de ingeniosos procesos productivos para la obtención de metabolitos de interés, o de la novedosa manipulación genética de microorganismos como la scherichia coli; si no que ha establecido una serie de normas para el control de la calidad de los productos biotecnológicos. Algunas de estas normas están encaminadas a garantizar la reproducibilidad y especificidad de las técnicas analíticas empleadas en el control de calidad, a través de la validación.

  11. Validation of analytical methods used in the quality control of biotechnology products

    Directory of Open Access Journals (Sweden)

    I. Rosales

    1998-07-01

    Full Text Available Las biotecnologías modernas, no solo se han ocupado del diseño de ingeniosos procesos productivos para la obtención de metabolitos de interés, o de la novedosa manipulación genética de microorganismos como la scherichia coli; si no que ha establecido una serie de normas para el control de la calidad de los productos biotecnológicos. Algunas de estas normas están encaminadas a garantizar la reproducibilidad y especificidad de las técnicas analíticas empleadas en el control de calidad, a través de la validación.

  12. Quality control of dosemeters

    International Nuclear Information System (INIS)

    Mendes, L.

    1984-01-01

    Nuclear medicine laboratories are required to assay samples of radioactivity to be administered to patients. Almost universally, these assays are acomplished by use of a well ionization chamber isotope calibrator. The Instituto de Radioprotecao e Dosimetria (Institute for Radiological Protection and Dosimetry) of the Comissao Nacional de Energia Nuclear (National Commission for Nuclear Energy) is carrying out a National Quality Control Programme in Nuclear Medicine, supported by the International Atomic Energy Agency. The assessment of the current needs and practices of quality control in the entire country of Brazil includes Dose Calibrators and Scintilation Cameras, but this manual is restricted to the former. Quality Control Procedures for these Instruments are described in this document together with specific recommendations and assessment of its accuracy. (Author) [pt

  13. Quality control of roll-to-roll processed polymer solar modules by complementary imaging methods

    DEFF Research Database (Denmark)

    Rösch, R.; Krebs, Frederik C; Tanenbaum, D.M.

    2012-01-01

    We applied complementary imaging methods to investigate processing failures of roll-to-roll solution processed polymer solar modules based on polymer:fullerene bulk heterojunctions. For investigation of processing deficiencies in solar modules we employed dark lock-in thermography (DLIT......), electroluminescence (ELI) and photoluminescence/reflection imaging (PLI/RI) complemented by optical imaging (OI). The combination of all high resolution images allowed us to allocate the origin of processing errors to a specific deposition process, i.e. the insufficient coverage of an electrode interlayer...

  14. Robot-operated quality control station based on the UTT method

    Science.gov (United States)

    Burghardt, Andrzej; Kurc, Krzysztof; Szybicki, Dariusz; Muszyńska, Magdalena; Nawrocki, Jacek

    2017-03-01

    This paper presents a robotic test stand for the ultrasonic transmission tomography (UTT) inspection of stator vane thickness. The article presents the method of the test stand design in Autodesk Robot Structural Analysis Professional 2013 software suite. The performance of the designed test stand solution was simulated in the RobotStudio software suite. The operating principle of the test stand measurement system is presented with a specific focus on the measurement strategy. The results of actual wall thickness measurements performed on stator vanes are presented.

  15. Quality control method to measure predator evasion in wild and mass-reared Mediterranean fruit flies (Diptera: Tephritidae)

    International Nuclear Information System (INIS)

    Hendrichs, M.; Wornoayporn, V.; Hendrichs, J.; Katsoyannos, B.

    2007-01-01

    Sterile male insects, mass-reared and released as part of sterile insect technique (SIT) programs, must survive long enough in the field to mature sexually and compete effectively with wild males for wild females. An often reported problem in Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann) SIT programs is that numbers of released sterile males decrease rapidly in the field for various reasons, including losses to different types of predators. This is a serious issue in view that most operational programs release sterile flies at an age when they are still immature. Previous field and field-cage tests have confirmed that flies of laboratory strains are less able to evade predators than wild flies. Such tests involve, however, considerable manipulation and observation of predators and are therefore not suitable for routine measurements of predator evasion. Here we describe a simple quality control method with aspirators to measure agility in medflies and show that this parameter is related to the capacity of flies to evade predators. Although further standardization of the test is necessary to allow more accurate inter-strain comparisons, results confirm the relevance of measuring predator evasion in mass-reared medfly strains. Besides being a measure of this sterile male quality parameter, the described method could be used for the systematic selection of strains with a higher capacity for predator evasion. (author) [es

  16. Quality Management, Quality Assurance and Quality Control in Blood Establishments

    OpenAIRE

    Bolbate, N

    2008-01-01

    Quality terms and the roots of the matter are analyzed according to European Committee’s recommendations. Essence of process and product quality control as well as essence of quality assurance is described. Quality system’s structure including quality control, quality assurance and management is justified in the article.

  17. Quality control in haemostasis.

    Science.gov (United States)

    Capel, P; Chatelain, B; Leclerq, R; Lust, A; Masure, R; Arnout, J

    1992-01-01

    Laboratory investigation of the haemostatic system deserves particular procedures in the quality control of analytical variables as well as preanalytical variables. This paper reviews the precautions that have to be taken in the blood prelevement, the transport of the tubes and the performance of the laboratory tests aimed to investigate the haemostatic system in order to obtain reliable results.

  18. Ocean Data Quality Control

    Science.gov (United States)

    2011-11-18

    the aero- sol at the coincident time and location of the satellite SST retrievals. This informa- tion is available in the daytime for the anti-solar...are of the same form, such as probabilities or standard normal deviates. A quality control decision-making algorithm in use at the U.S. Navy oceano

  19. VGI QUALITY CONTROL

    Directory of Open Access Journals (Sweden)

    C. C. Fonte

    2015-08-01

    Full Text Available This paper presents a framework for considering quality control of volunteered geographic information (VGI. Different issues need to be considered during the conception, acquisition and post-acquisition phases of VGI creation. This includes items such as collecting metadata on the volunteer, providing suitable training, giving corrective feedback during the mapping process and use of control data, among others. Two examples of VGI data collection are then considered with respect to this quality control framework, i.e. VGI data collection by National Mapping Agencies and by the most recent Geo-Wiki tool, a game called Cropland Capture. Although good practices are beginning to emerge, there is still the need for the development and sharing of best practice, especially if VGI is to be integrated with authoritative map products or used for calibration and/or validation of land cover in the future.

  20. Quality and reliability control on assemblies

    International Nuclear Information System (INIS)

    Mueller, H.

    1976-01-01

    Taking as an example electronic assemblies in printed circuit board engineering, quality control during manufacture is dealt with. After giving a survey of four phases of quality and reliability control, some specific methods of quality control are dealt with by means of a flowchart, and by some examples the necessity and the success of these measures are shown. (RW) [de

  1. Validation of analytical method to quality control and the stability study of 0.025 % eyedrops Ketotiphen

    International Nuclear Information System (INIS)

    Troche Concepcion, Yenilen; Romero Diaz, Jacqueline Aylema; Garcia Penna, Caridad M

    2010-01-01

    The Ketotiphen eyedrop is prescribed to relief the signs and symptoms of allergic conjunctivitis due to its potent H 1a ntihistaminic effect showing some ability to inhibit the histamine release and other mediators in cases of mastocytosis. The aim of present paper was to develop and validate an analytical method for the high-performance liquid chromatography, to quality control and the stability studies of 0.025 % eyedrop Ketotiphen. Method was based on active principle separation by means of a Lichrosorb RP-18 (5 μm) (250 x 4 mm), with UV detection to 296 nm using a mobile phase including a non-gasified mixture of methanol:buffer-phosphate (75:25; pH 8.5) adding 1 mL of Isopropanol by each 1 000 mL of the previous mixture at a 1.2 mL/min flow velocity. The analytical method was linear, accurate, specific and exact during the study concentrations

  2. Quality assurance and statistical control

    DEFF Research Database (Denmark)

    Heydorn, K.

    1991-01-01

    In scientific research laboratories it is rarely possible to use quality assurance schemes, developed for large-scale analysis. Instead methods have been developed to control the quality of modest numbers of analytical results by relying on statistical control: Analysis of precision serves...... to detect analytical errors by comparing the a priori precision of the analytical results with the actual variability observed among replicates or duplicates. The method relies on the chi-square distribution to detect excess variability and is quite sensitive even for 5-10 results. Interference control...... serves to detect analytical bias by comparing results obtained by two different analytical methods, each relying on a different detection principle and therefore exhibiting different influence from matrix elements; only 5-10 sets of results are required to establish whether a regression line passes...

  3. Quality control of mammography

    International Nuclear Information System (INIS)

    Hering, K.G.

    1986-01-01

    Random checks of mammograms allow to clearly assess quality controls concerning correct application and operation of the radiographic system indicated by rich contrast in breast tissue images, complete imaging of the mammary parenchyma, freedom from blurs due to motion, efficient breast compression, correct film labelling and perfect maintenance of the film screen system. In addition to these subjective assessments, the following points should be considered when using objective measurement procedures and phantoms: Testing the correct function of X-ray and radiographic equipment by means of test specimens to measure KV standard (KV=Association of German Panel Doctors), mAS and automatic exposure timer; comparing dose and density to initial values and checking film processing by using a sensitometer. Quality assurance handling varies from one KV to the next. That is why the users need to obtain the guidelines of the respective KV relative to radiological quality assurance and to proceed according to these. (orig.) [de

  4. [Research progress on standardization study of NIR spectroscopy based method for quality control of traditional Chinese medicine].

    Science.gov (United States)

    Li, Wen-Long; Qu, Hai-Bin

    2016-10-01

    In recent years, the near infrared (NIR) spectroscopy has gained wide acceptance within the quantitative analysis of traditional Chinese medicine (TCM). However, the lack of technical standards is the bottleneck problem in this process. To address this issue, standardization study of the NIR spectroscopy based method for the quantitative analysis of TCM is needed, in which the specific characteristics of TCM should be given full considerations. The main research contents include:the scope definition for the application of NIR spectroscopy in the TCM quantitative analysis field, the selection criteria for the sample pretreatment and spectral acquisition conditions, the rules for the model optimization and evaluation, and the regulations for the model update and transfer. In this paper, some foreign studies in the agricultural areas are reviewed for reference. Different chemometrics methods reported in the literature are investigated and compared systematically. This research is important actual significance to the theoretical development of NIR spectroscopy analytical techniques, and will effectively promote the application of the technology in the TCM industry. Furthermore, it is beneficial to improve the technical level of TCM quality control, and can also be used as references to achieve similar purposes for other natural products. Copyright© by the Chinese Pharmaceutical Association.

  5. Comparative investigation of the gel chromatography column scanning method for quality control of /sup 99/sup(m)Tc-methylenediphosphonate

    Energy Technology Data Exchange (ETDEWEB)

    Darte, L

    1981-04-01

    Gel chromatography column scanning (GCS) is the method of choice for quality control of sup(99m)Tc-MDP preparations. Using this method all the labelled components are obtained rapidly in one simple test procedure. The influence of various parameters such as gel type, column size, prehistory of column, equilibration, eluent, elution volume and flow rate upon the results have been investigated. Test results for sup(99 m)Tc-MDP have been compared for several different GCS systems, a few TLC systems and column chromatography with fraction collection. The GCS technique, optimized for testing sup(99m)Tc-MDP preparations has been applied in a few experiments in which very good reproducibility is required: Labelling kinetics and stability when stored at room temperature or in a refrigerator and influence of the sup(99m)Te/(sup(99m)Tc + /sup 99/Tc) atomic ratio and of the amount of radioactivity on the sup(99m)Tc-MDP labelling yield, covering parameter ranges of clinical interest, have been studied.

  6. Analytical method development and validation for quantification of uranium by Fourier Transform Infrared Spectroscopy (FTIR) for routine quality control analysis

    International Nuclear Information System (INIS)

    Pereira, Elaine; Silva, Ieda de S.; Gomide, Ricardo G.; Pires, Maria Aparecida F.

    2015-01-01

    This work presents a low cost, simple and new methodology for direct determination uranium in different matrices uranium: organic phase (UO 2 (NO 3 ) 2 .2TBP - uranyl nitrate complex) and aqueous phase (UO 2 (NO 3 ) 2 - NTU - uranyl nitrate), based on Fourier Transform Infrared spectroscopy (FTIR) using KBr pellets technique. The analytical validation is essential to define if a developed methodology is completely adjusted to the objectives that it is destined and is considered one of the main instruments of quality control. The parameters used in the validation process were: selectivity, linearity, limits of detection (LD) and quantitation (LQ), precision (repeatability and intermediate precision), accuracy and robustness. The method for uranium in organic phase (UO 2 (NO 3 ) 2 .2TBP in hexane/embedded in KBr) was linear (r=0.9989) over the range of 1.0 g L -1 a 14.3 g L -1 , LD were 92.1 mg L -1 and LQ 113.1 mg L -1 , precision (RSD < 1.6% and p-value < 0.05), accurate (recovery of 100.1% - 102.9%). The method for uranium aqueous phase (UO 2 (NO 3 )2/embedded in KBr) was linear (r=0.9964) over the range of 5.4 g L -1 a 51.2 g L -1 , LD were 835 mg L -1 and LQ 958 mg L -1 , precision (RSD < 1.0% and p-value < 0.05), accurate (recovery of 99.1% - 102.0%). The FTIR method is robust regarding most of the variables analyzed, as the difference between results obtained under nominal and modified conditions were lower than the critical value for all analytical parameters studied. Some process samples were analyzed in FTIR and compared with gravimetric and x ray fluorescence (XRF) analyses showing similar results in all three methods. The statistical tests (Student-t and Fischer) showed that the techniques are equivalent. (author)

  7. Quality control in dual head γ-cameras: comparison between methods and software s used for image analysis

    International Nuclear Information System (INIS)

    Nayl E, A.; Fornasier, M. R.; De Denaro, M.; Sulieman, A.; Alkhorayef, M.; Bradley, D.

    2017-10-01

    Patient radiation dose and image quality are the main issues in nuclear medicine (Nm) procedures. Currently, many protocols are used for image acquisition and analysis of quality control (Qc) tests. National Electrical Manufacturers Association (Nema) methods and protocols are widely accepted method used for providing accurate description, measurement and reporting of γ-camera performance parameters. However, no standard software is available for image analysis. The aim os this study was to compare between the vendor Qc software analysis and three software from different developers downloaded free from internet; NMQC, Nm Tool kit and ImageJ-Nm Tool kit software. The three software are used for image analysis of some Qc tests for γ-cameras based on Nema protocols including non-uniformity evaluation. Ten non-uniformity Qc images were taken from dual head γ-camera (Siemens Symbia) installed in Trieste general hospital (Italy), and analyzed. Excel analysis was used as baseline calculation of the non-uniformity test according Nema procedures. The results of the non-uniformity analysis showed good agreement between the three independent software and excel calculation (the average differences were 0.3%, 2.9%, 1.3% and 1.6% for UFOV integral, UFOV differential, CFOV integral and CFOV differential respectively), while significant difference was detected on the analysis of the company Qc software with compare to the excel analysis (the average differences were 14.6%, 20.7%, 25.7% and 31.9% for UFOV integral, UFOV differential, CFOV integral and CFOV differential respectively). NMQC software was the best in comparison with the excel calculations. The variation in the results is due to different pixel sizes used for analysis in the three software and the γ-camera Qc software. Therefore, is important to perform the tests by the vendor Qc software as well as by independent analysis to understand the differences between the values. Moreover, the medical physicist should know

  8. Quality control in dual head γ-cameras: comparison between methods and software s used for image analysis

    Energy Technology Data Exchange (ETDEWEB)

    Nayl E, A. [Sudan Atomic Energy Commission, Radiation Safety Institute, Khartoum (Sudan); Fornasier, M. R.; De Denaro, M. [Azienda Sanitaria Universitaria Integrata di Trieste, Medical Physics Department, Via Giovanni Sai 7, 34128 Trieste (Italy); Sulieman, A. [Prince Sattam bin Abdulaziz University, College of Applied Medical Sciences, Radiology and Medical Imaging Department, P. O. Box 422, 11942 Al-Kharj (Saudi Arabia); Alkhorayef, M.; Bradley, D., E-mail: abdwsh10@hotmail.com [University of Surrey, Department of Physics, GU2-7XH Guildford, Surrey (United Kingdom)

    2017-10-15

    Patient radiation dose and image quality are the main issues in nuclear medicine (Nm) procedures. Currently, many protocols are used for image acquisition and analysis of quality control (Qc) tests. National Electrical Manufacturers Association (Nema) methods and protocols are widely accepted method used for providing accurate description, measurement and reporting of γ-camera performance parameters. However, no standard software is available for image analysis. The aim os this study was to compare between the vendor Qc software analysis and three software from different developers downloaded free from internet; NMQC, Nm Tool kit and ImageJ-Nm Tool kit software. The three software are used for image analysis of some Qc tests for γ-cameras based on Nema protocols including non-uniformity evaluation. Ten non-uniformity Qc images were taken from dual head γ-camera (Siemens Symbia) installed in Trieste general hospital (Italy), and analyzed. Excel analysis was used as baseline calculation of the non-uniformity test according Nema procedures. The results of the non-uniformity analysis showed good agreement between the three independent software and excel calculation (the average differences were 0.3%, 2.9%, 1.3% and 1.6% for UFOV integral, UFOV differential, CFOV integral and CFOV differential respectively), while significant difference was detected on the analysis of the company Qc software with compare to the excel analysis (the average differences were 14.6%, 20.7%, 25.7% and 31.9% for UFOV integral, UFOV differential, CFOV integral and CFOV differential respectively). NMQC software was the best in comparison with the excel calculations. The variation in the results is due to different pixel sizes used for analysis in the three software and the γ-camera Qc software. Therefore, is important to perform the tests by the vendor Qc software as well as by independent analysis to understand the differences between the values. Moreover, the medical physicist should know

  9. Statistical methods in quality assurance

    International Nuclear Information System (INIS)

    Eckhard, W.

    1980-01-01

    During the different phases of a production process - planning, development and design, manufacturing, assembling, etc. - most of the decision rests on a base of statistics, the collection, analysis and interpretation of data. Statistical methods can be thought of as a kit of tools to help to solve problems in the quality functions of the quality loop with respect to produce quality products and to reduce quality costs. Various statistical methods are represented, typical examples for their practical application are demonstrated. (RW)

  10. Pilot studies for the North American Soil Geochemical Landscapes Project - Site selection, sampling protocols, analytical methods, and quality control protocols

    Science.gov (United States)

    Smith, D.B.; Woodruff, L.G.; O'Leary, R. M.; Cannon, W.F.; Garrett, R.G.; Kilburn, J.E.; Goldhaber, M.B.

    2009-01-01

    In 2004, the US Geological Survey (USGS) and the Geological Survey of Canada sampled and chemically analyzed soils along two transects across Canada and the USA in preparation for a planned soil geochemical survey of North America. This effort was a pilot study to test and refine sampling protocols, analytical methods, quality control protocols, and field logistics for the continental survey. A total of 220 sample sites were selected at approximately 40-km intervals along the two transects. The ideal sampling protocol at each site called for a sample from a depth of 0-5 cm and a composite of each of the O, A, and C horizons. The Ca, Fe, K, Mg, Na, S, Ti, Ag, As, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Ga, In, La, Li, Mn, Mo, Nb, Ni, P, Pb, Rb, Sb, Sc, Sn, Sr, Te, Th, Tl, U, V, W, Y, and Zn by inductively coupled plasma-mass spectrometry and inductively coupled plasma-atomic emission spectrometry following a near-total digestion in a mixture of HCl, HNO3, HClO4, and HF. Separate methods were used for Hg, Se, total C, and carbonate-C on this same size fraction. Only Ag, In, and Te had a large percentage of concentrations below the detection limit. Quality control (QC) of the analyses was monitored at three levels: the laboratory performing the analysis, the USGS QC officer, and the principal investigator for the study. This level of review resulted in an average of one QC sample for every 20 field samples, which proved to be minimally adequate for such a large-scale survey. Additional QC samples should be added to monitor within-batch quality to the extent that no more than 10 samples are analyzed between a QC sample. Only Cr (77%), Y (82%), and Sb (80%) fell outside the acceptable limits of accuracy (% recovery between 85 and 115%) because of likely residence in mineral phases resistant to the acid digestion. A separate sample of 0-5-cm material was collected at each site for determination of organic compounds. A subset of 73 of these samples was analyzed for a suite of

  11. Organizing quality control programmes

    International Nuclear Information System (INIS)

    Hjardemaal, O.

    1989-01-01

    When procuring new equipment, performance and safety should be specified, if possible by reference to international standards. Some of the characteristics of the International Electrotechnical Commission (IEC) standard for X-ray generators, in particular the accuracy of the operating data, are described. The quality control tests to be performed after installation comprise acceptance test, status test and constancy test. The first two involve absolute measurements and will be the responsibility of physicists or engineers. Apparently limiting values stipulated by users are a factor of two lower than the limits of the IEC standard. By means of an example it is shown that modern X-ray generators can meet the lower limits of the users without problems. In order to obtain optimum initial quality when procuring new equipment operating data, limiting values must be specified and must be verified by acceptance testing, etc. However, in many countries physicists and engineers are not available for this job. A relatively uncomplicated test object can be used by radiographers for checks on fluoroscopic systems. The findings from such tests in Denmark are compared with other published findings and good agreement is found. Therefore it is proposed that such uncomplicated tests could form the basis for quality evaluation. (author)

  12. Quality control of radiodiagnostics

    International Nuclear Information System (INIS)

    Alonso Diaz, M.; Castaneda Arronte, M.J.; Matorras Galan, P.; Diaz-Caneja Rodriguez, N.; Gutierrez Diaz Velarde, I.

    1993-01-01

    Since May 1990, a program of quality control of diagnostic X-ray equipment is underway in the University Hospital Marques de Valdecilla. This includes the design and application of measuring specifications and procedures corresponding to the different parameters of the equipment. The specified values are presented, as are those obtained for geometric and exposition parameters using the equipment. The specifications for the geometric parameters are fulfilled in an large proportion (between 52 and 86%) of the units, and the rest can easily be adjusted. However, 85% of the units can be made to operate with a field larger than that of the screen of the image monitor and approximately half of them can operate at a shorter focus-to-patient distance than that specified. With respect to the exposition parameters, in general, these units do not fulfill the specifications and their behavior is not uniform. The results obtained indicate that the equipment studied could be made to comply with the proposed specifications if a Maintenance Program were initiated in coordination with that of Quality Control. (Author)

  13. Quality control of radiopharmaceuticals

    International Nuclear Information System (INIS)

    Wallen, O.; Komarov, E.

    1973-01-01

    The International Pharmacopoeia published by WHO constitutes a collection of recommended specifications for pharmaceutical preparations which are not intended to have legal status in any country, but serve as references so that national specifications can be established on a similar basis in any country. Like any pharmacopoeia, it contains monographs for the quality con trol of drugs by means of chemical, physical and simple biological methods, as well as appendices describing general methods. The work on the International Pharmacopoeia is carried out by WHO with the aid of the Expert Advisory Panel on the International Pharmacopoeia and Pharmaceutical Preparations and other specialists from various countries and the Expert Committee on Specifications for Pharmaceutical Preparations. (author)

  14. Interaction between production control and quality control

    NARCIS (Netherlands)

    Bij, van der J.D.; Ekert, van J.H.W.

    1999-01-01

    Describes a qualitative study on interaction between systems for production control and quality control within industrial organisations. Production control and quality control interact in a sense. Good performance for one aspect often influences or frustrates the performance of the other. As far as

  15. Quality control in nuclear medicine

    International Nuclear Information System (INIS)

    Leme, P.R.

    1983-01-01

    The following topics are discussed: objectives of the quality control in nuclear medicine; the necessity of the quality control in nuclear medicine; guidelines and recommendations. An appendix is given concerning the guidelines for the quality control and instrumentation in nuclear medicine. (M.A.) [pt

  16. Quantification of histochemical stains using whole slide imaging: development of a method and demonstration of its usefulness in laboratory quality control.

    Science.gov (United States)

    Gray, Allan; Wright, Alex; Jackson, Pete; Hale, Mike; Treanor, Darren

    2015-03-01

    Histochemical staining of tissue is a fundamental technique in tissue diagnosis and research, but it suffers from significant variability. Efforts to address this include laboratory quality controls and quality assurance schemes, but these rely on subjective interpretation of stain quality, are laborious and have low reproducibility. We aimed (1) to develop a method for histochemical stain quantification using whole slide imaging and image analysis and (2) to demonstrate its usefulness in measuring staining variation. A method to quantify the individual stain components of histochemical stains on virtual slides was developed. It was evaluated for repeatability and reproducibility, then applied to control sections of an appendix to quantify H&E staining (H/E intensities and H:E ratio) between automated staining machines and to measure differences between six regional diagnostic laboratories. The method was validated with laboratories from 0.57 to 0.89. A simple method using whole slide imaging can be used to quantify and compare histochemical staining. This method could be deployed in routine quality assurance and quality control. Work is needed on whole slide imaging devices to improve reproducibility. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

  17. Printing quality control automation

    Science.gov (United States)

    Trapeznikova, O. V.

    2018-04-01

    One of the most important problems in the concept of standardizing the process of offset printing is the control the quality rating of printing and its automation. To solve the problem, a software has been developed taking into account the specifics of printing system components and the behavior in printing process. In order to characterize the distribution of ink layer on the printed substrate the so-called deviation of the ink layer thickness on the sheet from nominal surface is suggested. The geometric data construction the surface projections of the color gamut bodies allows to visualize the color reproduction gamut of printing systems in brightness ranges and specific color sectors, that provides a qualitative comparison of the system by the reproduction of individual colors in a varying ranges of brightness.

  18. Information System Quality Assessment Methods

    OpenAIRE

    Korn, Alexandra

    2014-01-01

    This thesis explores challenging topic of information system quality assessment and mainly process assessment. In this work the term Information System Quality is defined as well as different approaches in a quality definition for different domains of information systems are outlined. Main methods of process assessment are overviewed and their relationships are described. Process assessment methods are divided into two categories: ISO standards and best practices. The main objective of this w...

  19. Problems of quality assurance and quality control in diagnostic radiology

    International Nuclear Information System (INIS)

    Angerstein, W.

    1986-01-01

    Topical problems of quality assurance and quality control in diagnostic radiology are discussed and possible solutions are shown. Complex units are differentiated with reference to physicians, technicians, organization of labour, methods of examination and indication. Quality control of radiologic imaging systems should involve three stages: (1) simple tests carried out by radiologic technicians, (2) measurements by service technicians, (3) testing of products by the manufacturer and independent governmental or health service test agencies. (author)

  20. Linking fish tolerance to water quality criteria for the assessment of environmental flows: A practical method for streamflow regulation and pollution control.

    Science.gov (United States)

    Zhao, Changsen; Yang, Shengtian; Liu, Junguo; Liu, Changming; Hao, Fanghua; Wang, Zhonggen; Zhang, Huitong; Song, Jinxi; Mitrovic, Simon M; Lim, Richard P

    2018-05-15

    The survival of aquatic biota in stream ecosystems depends on both water quantity and quality, and is particularly susceptible to degraded water quality in regulated rivers. Maintenance of environmental flows (e-flows) for aquatic biota with optimum water quantity and quality is essential for sustainable ecosystem services, especially in developing regions with insufficient stream monitoring of hydrology, water quality and aquatic biota. Few e-flow methods are available that closely link aquatic biota tolerances to pollutant concentrations in a simple and practical manner. In this paper a new method was proposed to assess e-flows that aimed to satisfy the requirements of aquatic biota for both the quantity and quality of the streamflow by linking fish tolerances to water quality criteria, or the allowable concentration of pollutants. For better operation of water projects and control of pollutants discharged into streams, this paper presented two coefficients for streamflow adjustment and pollutant control. Assessment of e-flows in the Wei River, the largest tributary of the Yellow River, shows that streamflow in dry seasons failed to meet e-flow requirements. Pollutant influx exerted a large pressure on the aquatic ecosystem, with pollutant concentrations much higher than that of the fish tolerance thresholds. We found that both flow velocity and water temperature exerted great influences on the pollutant degradation rate. Flow velocity had a much greater influence on pollutant degradation than did the standard deviation of flow velocity. This study provides new methods to closely link the tolerance of aquatic biota to water quality criteria for e-flow assessment. The recommended coefficients for streamflow adjustment and pollutant control, to dynamically regulate streamflow and control pollutant discharge, are helpful for river management and ecosystems rehabilitation. The relatively low data requirement also makes the method easy to use efficiently in developing

  1. Empirical evaluation of humpback whale telomere length estimates; quality control and factors causing variability in the singleplex and multiplex qPCR methods

    DEFF Research Database (Denmark)

    Olsen, Morten Tange; Bérubé, Martine; Robbins, Jooke

    2012-01-01

    BACKGROUND:Telomeres, the protective cap of chromosomes, have emerged as powerful markers of biological age and life history in model and non-model species. The qPCR method for telomere length estimation is one of the most common methods for telomere length estimation, but has received recent...... steps of qPCR. In order to evaluate the utility of the qPCR method for telomere length estimation in non-model species, we carried out four different qPCR assays directed at humpback whale telomeres, and subsequently performed a rigorous quality control to evaluate the performance of each assay. RESULTS...... to 40% depending on assay and quantification method, however this variation only affected telomere length estimates in the worst performing assays. CONCLUSION:Our results suggest that seemingly well performing qPCR assays may contain biases that will only be detected by extensive quality control...

  2. Development and validation of an analytical method for quality control and the stability of the eyedrops 10 % Phenylephrine and the 1 % Tropicamide

    International Nuclear Information System (INIS)

    Garcia Penna, Caridad Margarita; Botet Garcia, Martha; Troche Concepcion, Yenilen

    2011-01-01

    An analytical high-performance liquid chromatography method was developed and validated applicable to quality control and to stability study of 10 % phenylephrine plus eyedrops 1 % tropicamide. To quantify simultaneously both active principles in the finished product, separation was carried out through a Lichrosorb RP-18 (15 μm) (260 x 4 mm) column chromatography, with ultraviolet detection at 253 nm using the mobile phase composed of methanol: distilled water (1:1), with 1.1 g of sodium 1-octasulfanate by litre and pH fitted to 3.0 with phosphoric acid and the quantification of this front to a reference sample using the external standard method. The analytical method developed was linear, precise, specific and accurate in the rank of study concentrations, established for the quality control and stability study of the finished product since there were not analytical methods designed for these aims

  3. Results of evaluation of quality control measurement instrument of x-ray diagnostic equipment by non-invasive method

    International Nuclear Information System (INIS)

    Laan, Flavio T. van der; Elbern, Alvin W.

    1996-01-01

    This work shows the results of the tests realized on Santa Rita Hospital (Porto Alegre), using a non invasive quality control measurement instrument, developed in this University for fast measurement of essential parameters of X-rays diagnostic equipment. In the tests we used a diagnostics Siemens X ray, model Heliofos 4E as our standard equipment. The linearity test of sensor probe and the exposure rate calibration was performed, with a Palmer Dosimeter. For the kVp and exposure time we used a RTI commercial instrument. (author)

  4. Metrology and quality control handbook

    International Nuclear Information System (INIS)

    Hofmann, D.

    1983-01-01

    This book tries to present the fundamentals of metrology and quality control in brief surveys. Compromises had to be made in order to reduce the material available to a sensible volume for the sake of clarity. This becomes evident by the following two restrictions which had to made: First, in dealing with the theoretical principles of metrology and quality control, mere reference had to be made in many cases to the great variety of special literature without discussing it to explain further details. Second, in dealing with the application of metrology and quality control techniques in practice, only the basic qantities of the International System of Units (SI) could be taken into account as a rule. Some readers will note that many special measuring methods and equipment known to them are not included in this book. I do hope, however, that this short-coming will show to have a positive effect, too. This book will show the reader how to find the basic quantities and units from the derived quantities and units, and the steps that are necessary to solve any kind of measuring task. (orig./RW) [de

  5. [Investigation on pattern and methods of quality control for Chinese materia medica based on dao-di herbs and bioassay - bioassay for Coptis chinensis].

    Science.gov (United States)

    Yan, Dan; Xiao, Xiao-he

    2011-05-01

    Establishment of bioassay methods is the technical issues to be faced with in the bioassay of Chinese materia medica. Taking the bioassay of Coptis chinensis Franch. as an example, the establishment process and application of the bioassay methods (including bio-potency and bio-activity fingerprint) were explained from the aspects of methodology, principle of selection, experimental design, method confirmation and data analysis. The common technologies were extracted and formed with the above aspects, so as to provide technical support for constructing pattern and method of the quality control for Chinese materia medica based on the dao-di herbs and bioassay.

  6. Commercial jet fuel quality control

    Energy Technology Data Exchange (ETDEWEB)

    Strauss, K.H.

    1995-05-01

    The paper discusses the purpose of jet fuel quality control between the refinery and the aircraft. It describes fixed equipment, including various types of filters, and the usefulness and limitations of this equipment. Test equipment is reviewed as are various surveillance procedures. These include the Air Transport Association specification ATA 103, the FAA Advisory Circular 150/5230-4, the International Air Transport Association Guidance Material for Fuel Quality Control and Fuelling Service and the Guidelines for Quality Control at Jointly Operated Fuel Systems. Some past and current quality control problems are briefly mentioned.

  7. Quality control of activity detectors

    International Nuclear Information System (INIS)

    Surma, M.J.

    2002-01-01

    The conditions decided on radiometric measurements quality as geometry, background, calibration etc. have been described. The testing methods for achieving high quality of radioactivity measurements using nuclear medicine instruments have been recommended

  8. Physicians, radiologists, and quality control

    International Nuclear Information System (INIS)

    Payne, W.F.

    1973-01-01

    Factors involved in quality control in medical x-ray examinations to achieve the least possible exposure to the patient are discussed. It would be hoped that film quality will remain in the position of paramount importance that it must in order to achieve the greatest amount of diagnostic information on each radiographic examination. At the same time, it is hoped that this can be done by further reducing the exposure of the patient to ionizing radiation by the methods that have been discussed; namely, education of the physician, radiologist, and technologist, modern protective equipment and departmental construction, efficient collimation whether automatic or manual, calibration and output measurement of the radiographic and fluoroscopic units, ongoing programs of education within each department of radiographic facility, film badge monitoring, education of and cooperation with the nonradiologic physician, and hopefully, more intensive programs by the National and State Bureaus and Departments of Radiological Health in education and encouragement to the medical community. (U.S.)

  9. Quality control of pesticide products

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-07-15

    In light of an established need for more efficient analytical procedures, this publication, which documents the findings of an IAEA coordinated research project (CRP) on “Quality Control of Pesticide Products”, simplifies the existing protocol for pesticide analysis while simultaneously upholding existing standards of quality. This publication includes both a report on the development work done in the CRP and a training manual for use by pesticide analysis laboratories. Based on peer reviewed and internationally recognized methods published by the Association of Analytical Communities (AOAC) and the Collaborative International Pesticides Analytical Council (CIPAC), this report provides laboratories with versatile tools to enhance the analysis of pesticide chemicals and to extend the scope of available analytical repertoires. Adoption of the proposed analytical methodologies promises to reduce laboratories’ use of solvents and the time spent on reconfiguration and set-up of analytical equipment.

  10. Quality control of pesticide products

    International Nuclear Information System (INIS)

    2009-07-01

    In light of an established need for more efficient analytical procedures, this publication, which documents the findings of an IAEA coordinated research project (CRP) on “Quality Control of Pesticide Products”, simplifies the existing protocol for pesticide analysis while simultaneously upholding existing standards of quality. This publication includes both a report on the development work done in the CRP and a training manual for use by pesticide analysis laboratories. Based on peer reviewed and internationally recognized methods published by the Association of Analytical Communities (AOAC) and the Collaborative International Pesticides Analytical Council (CIPAC), this report provides laboratories with versatile tools to enhance the analysis of pesticide chemicals and to extend the scope of available analytical repertoires. Adoption of the proposed analytical methodologies promises to reduce laboratories’ use of solvents and the time spent on reconfiguration and set-up of analytical equipment

  11. Preliminary investigation of the possibility for implementation of modified pharmacopoeial HPLC methods for quality control of metronidazole and ciprofloxacin in medicinal products used in veterinary medicine

    Directory of Open Access Journals (Sweden)

    Marjan Piponski

    2015-03-01

    Full Text Available Quality control of veterinary medicine products containing two different frequently used antibiotics metronidazole and ciprofloxacin hydrochloride, was considered and performed, using modified pharmacopoeial HPLC methods. Three different HPLC systems were used: Varian ProStar, Perkin Elmer Series and UPLC Shimadzu Prominence XR. The chromatographic columns used were LiChropher RP Select B 75 mm x 4 mm with 5 μm particles and Discovery C18 100 mm x 4,6 mm with 5 μm particles. Chromatographic methods used for both analytes were compendial, with minor modifications made for experimental purposes. Minor modifications of the pharmacopoeia prescribed chromatographic conditions, in both cases, led to better chromatographic parameters, good resolution and shorter analysis times. Optimized methods can be used for: determination of metronidazole in gel formulation, for its simultaneous quantification with preservatives present in the formulation and even for identification and quantification of its specified impurity, 2-methyl-5-nitroimidazole; determination of ciprofloxacin hydrochloride in film coated tablets and eye drops and identification and quantification of its specified impurities. These slightly modified and optimized pharmacopoeial methods for quality control of metronidazole and ciprofloxacin dosage forms used in veterinary medicine can be successfully applied in laboratories for quality control of veterinary medicines.

  12. INFORMATION SYSTEM QUALITY CONTROL KNOWLEDGE

    Directory of Open Access Journals (Sweden)

    Vladimir Nikolaevich Babeshko

    2017-02-01

    Full Text Available The development of the educational system is associated with the need to control the quality of educational services. Quality control knowledge is an important part of the scientific process. The penetration of computers into all areas of activities changing approaches and technologies that previously they were used.

  13. A Voltage Quality Detection Method

    DEFF Research Database (Denmark)

    Chen, Zhe; Wei, Mu

    2008-01-01

    This paper presents a voltage quality detection method based on a phase-locked loop (PLL) technique. The technique can detect the voltage magnitude and phase angle of each individual phase under both normal and fault power system conditions. The proposed method has the potential to evaluate various...

  14. Frontiers in statistical quality control

    CERN Document Server

    Wilrich, Peter-Theodor

    2004-01-01

    This volume treats the four main categories of Statistical Quality Control: General SQC Methodology, On-line Control including Sampling Inspection and Statistical Process Control, Off-line Control with Data Analysis and Experimental Design, and, fields related to Reliability. Experts with international reputation present their newest contributions.

  15. Control system design method

    Science.gov (United States)

    Wilson, David G [Tijeras, NM; Robinett, III, Rush D.

    2012-02-21

    A control system design method and concomitant control system comprising representing a physical apparatus to be controlled as a Hamiltonian system, determining elements of the Hamiltonian system representation which are power generators, power dissipators, and power storage devices, analyzing stability and performance of the Hamiltonian system based on the results of the determining step and determining necessary and sufficient conditions for stability of the Hamiltonian system, creating a stable control system based on the results of the analyzing step, and employing the resulting control system to control the physical apparatus.

  16. Quality assurance programme and quality control

    International Nuclear Information System (INIS)

    Alvarez de Buergo, L.

    1979-01-01

    The paper analyses the requirements for the quality assurance and control in nuclear power plant projects which are needed to achieve safe, reliable and economic plants. The author describes the structure for the establishment of a nuclear programme at the national level and the participation of the different bodies involved in a nuclear power plant project. The paper ends with the study of a specific case in Spain. (NEA) [fr

  17. Quantitative analysis method for ship construction quality

    Directory of Open Access Journals (Sweden)

    FU Senzong

    2017-03-01

    Full Text Available The excellent performance of a ship is assured by the accurate evaluation of its construction quality. For a long time, research into the construction quality of ships has mainly focused on qualitative analysis due to a shortage of process data, which results from limited samples, varied process types and non-standardized processes. Aiming at predicting and controlling the influence of the construction process on the construction quality of ships, this article proposes a reliability quantitative analysis flow path for the ship construction process and fuzzy calculation method. Based on the process-quality factor model proposed by the Function-Oriented Quality Control (FOQC method, we combine fuzzy mathematics with the expert grading method to deduce formulations calculating the fuzzy process reliability of the ordinal connection model, series connection model and mixed connection model. The quantitative analysis method is applied in analyzing the process reliability of a ship's shaft gear box installation, which proves the applicability and effectiveness of the method. The analysis results can be a useful reference for setting key quality inspection points and optimizing key processes.

  18. Quality control methods of strontium chloride 89SrCl2, radiopharmaceutical for palliative treatment of bone metastases

    International Nuclear Information System (INIS)

    Deptula, C.Z.; Kempisty, T.; Markiewicz, A.; Mikolajczak, R.; Stefancyk, S.; Terlikowska, T.; Zulczyk, W.

    1997-01-01

    Strontium chloride, 89 SrCI 2 , a radiopharmaceutical used for palliative therapy of bone metastases from breast and prostate cancer is produced by irradiation in a nuclear reactor. The analytical quality control procedures are established to confirm the radionuclidic purity of the preparation, its chemical composition and specific activity. Chemical concentration of strontium in the product is determined by complexometry with arsenazo III and chlorides assay by potentiometric titration with silver nitrate. The contamination with chemical impurities is determined by DC graphite spark spectrography. The specific activity and isotonicity of the solution are corrected by addition of natural SrCI 2 and NaCI. 90 Sr is produced in the 89 Sr(n,γ) 90 Sr reaction contributes to impurities. It decays to 90 Y and the activity of 90 Sr can be calculated from the activity of 90 Y. The extraction chromatography on nonionic acrylic ester polymer coated with organic solutions of selective features (Spec resins for Eichrom) is applied for separation of radionuclides. The extraction chromatography system consisting of two columns: strontium selective resin and rare earth elements selective resin was used for separation of 90 Y from 90 Sr in the 89 SrCI 2 solution. The 90 Y and 90 Sr carrier-free solutions used as tracers helped for determination of extraction conditions and efficiency. The concentration of 90 Sr determined in the analysed solution is at the level of 2.10 -4 % which conforms with the data calculated from irradiation parameters. The obtained product, strontium chloride 89 SrCI 2 for injection, forms a sterile and isotonic water solution (pH - 4-7) with specific activity of 89 Sr in the range from 3.5 to 6.3. MBq/mg and radioactive concentration of 37.5 MBq/ml. The radionuclidic purity of the obtained preparations is at the level of 99.9% with respect to 89 Sr

  19. Relationship of Indoor, Outdoor and Personal Air (RIOPA) study: study design, methods and quality assurance/control results.

    Science.gov (United States)

    Weisel, Clifford P; Zhang, Junfeng; Turpin, Barbara J; Morandi, Maria T; Colome, Steven; Stock, Thomas H; Spektor, Dalia M; Korn, Leo; Winer, Arthur; Alimokhtari, Shahnaz; Kwon, Jaymin; Mohan, Krishnan; Harrington, Robert; Giovanetti, Robert; Cui, William; Afshar, Masoud; Maberti, Silvia; Shendell, Derek

    2005-03-01

    The Relationship of Indoor, Outdoor and Personal Air (RIOPA) Study was undertaken to evaluate the contribution of outdoor sources of air toxics, as defined in the 1990 Clean Air Act Amendments, to indoor concentrations and personal exposures. The concentrations of 18 volatile organic compounds (VOCs), 17 carbonyl compounds, and fine particulate matter mass (PM(2.5)) were measured using 48-h outdoor, indoor and personal air samples collected simultaneously. PM2.5 mass, as well as several component species (elemental carbon, organic carbon, polyaromatic hydrocarbons and elemental analysis) were also measured; only PM(2.5) mass is reported here. Questionnaires were administered to characterize homes, neighborhoods and personal activities that might affect exposures. The air exchange rate was also measured in each home. Homes in close proximity (<0.5 km) to sources of air toxics were preferentially (2:1) selected for sampling. Approximately 100 non-smoking households in each of Elizabeth, NJ, Houston, TX, and Los Angeles, CA were sampled (100, 105, and 105 respectively) with second visits performed at 84, 93, and 81 homes in each city, respectively. VOC samples were collected at all homes, carbonyls at 90% and PM(2.5) at 60% of the homes. Personal samples were collected from nonsmoking adults and a portion of children living in the target homes. This manuscript provides the RIOPA study design and quality control and assurance data. The results from the RIOPA study can potentially provide information on the influence of ambient sources on indoor air concentrations and exposure for many air toxics and will furnish an opportunity to evaluate exposure models for these compounds.

  20. Method of controlling reactivity

    International Nuclear Information System (INIS)

    Tochihara, Hiroshi.

    1982-01-01

    Purpose: To improve the reactivity controlling characteristics by artificially controlling the leakage of neutron from a reactor and providing a controller for controlling the reactivity. Method: A reactor core is divided into several water gaps to increase the leakage of neutron, its reactivity is reduced, a gas-filled control rod or a fuel assembly is inserted into the gap as required, the entire core is coupled in a system to reduce the leakage of the neutron, and the reactivity is increased. The reactor shutdown is conducted by the conventional control rod, and to maintain critical state, boron density varying system is used together. Futher, a control rod drive is used with that similar to the conventional one, thereby enabling fast reactivity variation, and the positive reactivity can be obtained by the insertion, thereby improving the reactivity controlling characteristics. (Yoshihara, H.)

  1. [Quality control in herbal supplements].

    Science.gov (United States)

    Oelker, Luisa

    2005-01-01

    Quality and safety of food and herbal supplements are the result of a whole of different elements as good manufacturing practice and process control. The process control must be active and able to individuate and correct all possible hazards. The main and most utilized instrument is the hazard analysis critical control point (HACCP) system the correct application of which can guarantee the safety of the product. Herbal supplements need, in addition to standard quality control, a set of checks to assure the harmlessness and safety of the plants used.

  2. Control by quality: proposition of a typology.

    Science.gov (United States)

    Pujo, P; Pillet, M

    The application of Quality tools and methods in industrial management has always had a fundamental impact on the control of production. It influences the behavior of the actors concerned, while introducing the necessary notions and formalizations, especially for production systems with little or no automation, which constitute a large part of the industrial activity. Several quality approaches are applied in the workshop and are implemented at the level of the control. In this paper, the authors present a typology of the various approaches that have successively influenced control, such as statistical process control, quality assurance, and continuous improvement. First the authors present a parallel between production control and quality organizational structure. They note the duality between control, which is aimed at increasing productivity, and quality, which aims to satisfy the needs of the customer. They also note the hierarchical organizational structure of these two systems of management with, at each level, the notion of a feedback loop. This notion is fundamental to any kind of decision making. The paper is organized around the operational, tactical, and strategic levels, by describing for each level the main methods and tools for control by quality. The overview of these tools and methods starts at the operational level, with the Statistical Process Control, the Taguchi technique, and the "six sigma" approach. On the tactical level, we find a quality system approach, with a documented description of the procedures introduced in the firm. The management system can refer here to Quality Assurance, Total Productive Maintenance, or Management by Total Quality. The formalization through procedures of the rules of decision governing the process control enhances the validity of these rules. This leads to the enhancement of their reliability and to their consolidation. All this counterbalances the human, intrinsically fluctuating, behavior of the control

  3. Quality Control in Mammography: Image Quality and Patient Doses

    International Nuclear Information System (INIS)

    Ciraj Bjelac, O.; Arandjic, D.; Boris Loncar, B.; Kosutic, D.

    2008-01-01

    Mammography is method of choice for early detection of breast cancer. The purpose of this paper is preliminary evaluation the mammography practice in Serbia, in terms of both quality control indicators, i.e. image quality and patient doses. The survey demonstrated considerable variations in technical parameters that affect image quality and patients doses. Mean glandular doses ranged from 0.12 to 2.8 mGy, while reference optical density ranged from 1.2 to 2.8. Correlation between image contrast and mean glandular doses was demonstrated. Systematic implementation of quality control protocol should provide satisfactory performance of mammography units and maintain satisfactory image quality and keep patient doses as low as reasonably practicable. (author)

  4. Fuel cycle and quality control

    International Nuclear Information System (INIS)

    Stoll, W.

    1979-01-01

    The volume of the fuel cycle is described in its economic importance and its through put, as it is envisaged for the Federal Republic of Germany. Definitions are given for quality continuing usefulness of an object and translated into quality criteria. Requirements on performance of fuel elements are defined. The way in which experimental results are translated into mass production of fuel rods, is described. The economic potential for further quality effort is derived. Future ways of development for quality control organisation and structure are outlined. (Auth.)

  5. Computer controlled quality of analytical measurements

    International Nuclear Information System (INIS)

    Clark, J.P.; Huff, G.A.

    1979-01-01

    A PDP 11/35 computer system is used in evaluating analytical chemistry measurements quality control data at the Barnwell Nuclear Fuel Plant. This computerized measurement quality control system has several features which are not available in manual systems, such as real-time measurement control, computer calculated bias corrections and standard deviation estimates, surveillance applications, evaluaton of measurement system variables, records storage, immediate analyst recertificaton, and the elimination of routine analysis of known bench standards. The effectiveness of the Barnwell computer system has been demonstrated in gathering and assimilating the measurements of over 1100 quality control samples obtained during a recent plant demonstration run. These data were used to determine equaitons for predicting measurement reliability estimates (bias and precision); to evaluate the measurement system; and to provide direction for modification of chemistry methods. The analytical chemistry measurement quality control activities represented 10% of the total analytical chemistry effort

  6. Frontiers in statistical quality control

    CERN Document Server

    Wilrich, Peter-Theodor

    2001-01-01

    The book is a collection of papers presented at the 5th International Workshop on Intelligent Statistical Quality Control in Würzburg, Germany. Contributions deal with methodology and successful industrial applications. They can be grouped in four catagories: Sampling Inspection, Statistical Process Control, Data Analysis and Process Capability Studies and Experimental Design.

  7. Quality estimation methods used in product life cycle

    OpenAIRE

    M. Dudek-Burlikowska; D. Szewieczek

    2007-01-01

    Purpose: A new approach to quality control in production company with usage of quality research methods has been presented.Design/methodology/approach: The possibility of usage of quality research methods are connected with continuous quality improvement of pre-production, production and after-production spheres of organization. Interdependence of the quality research methods and product life cycle has been taken into account.Findings: At the present time the enterprises should integrate qua...

  8. Principles and Practices for Quality Assurance and Quality Control

    Science.gov (United States)

    Jones, Berwyn E.

    1999-01-01

    Quality assurance and quality control are vital parts of highway runoff water-quality monitoring projects. To be effective, project quality assurance must address all aspects of the project, including project management responsibilities and resources, data quality objectives, sampling and analysis plans, data-collection protocols, data quality-control plans, data-assessment procedures and requirements, and project outputs. Quality control ensures that the data quality objectives are achieved as planned. The historical development and current state of the art of quality assurance and quality control concepts described in this report can be applied to evaluation of data from prior projects.

  9. Quality Control Of Selected Pesticides With GC

    Energy Technology Data Exchange (ETDEWEB)

    Karasali, H. [Benaki Phytopathological Institute Laboratory of Physical and Chemical Analysis of Pesticides, Ekalis (Greece)

    2009-07-15

    The practical quality control of selected pesticides with GC is treated. Detailed descriptions are given on materials and methods used, including sample preparation and GC operating conditions. The systematic validation of multi methods is described, comprising performance characteristics in routine analysis, like selectivity, specificity etc. This is illustrated by chromatograms, calibration curves and tables derived from real laboratory data. (author)

  10. Quality Control in Production Processes

    Directory of Open Access Journals (Sweden)

    Prístavka Miroslav

    2016-09-01

    Full Text Available The tools for quality management are used for quality improvement throughout the whole Europe and developed countries. Simple statistics are considered one of the most basic methods. The goal was to apply the simple statistical methods to practice and to solve problems by using them. Selected methods are used for processing the list of internal discrepancies within the organization, and for identification of the root cause of the problem and its appropriate solution. Seven basic quality tools are simple graphical tools, but very effective in solving problems related to quality. They are called essential because they are suitable for people with at least basic knowledge in statistics; therefore, they can be used to solve the vast majority of problems.

  11. Development of the gaharu oil quality control

    International Nuclear Information System (INIS)

    Chong Saw Peng; Mohd Fajri Osman; Shyful Azizi Abdul Rahman; Khairuddin Abdul Rahim; Mat Rasol Awang

    2010-01-01

    Gaharu (Agar wood) is a secondary metabolite produces by the Aquilaria spp. and accumulates in the plant cell in oleoresin form. The essential oil known as gaharu oil can be extracted from this oleoresin gaharu via varies extraction method such as the water distillation, solvent extraction, pressurize extraction and etc. The gaharu oil extracted through different methods will give different fragrances. Besides, different source of materials will also give different in chemical profiles. In gaharu oil trading market, most of the buyers request quality assurance from the gaharu oil manufacturer to assure the gaharu oil purchased meets their standard requirement. Since there is a demand on gaharu oil quality assurance then it become a need to develop the gaharu oil quality control method in order to have a standard quality control of gaharu oil presented in a certificate of analysis and verified by laboratory. (author)

  12. TRAINING SYSTEM OF FUTURE SPECIALISTS: QUALITY CONTROL

    Directory of Open Access Journals (Sweden)

    Vladimir A. Romanov

    2015-01-01

    Full Text Available The aim of the investigation is development of innovative strategy of quality control training of engineers and skilled workers (hereinafter – future specialists in educational professional organizations on the principles of social partnership.Methods. Theoretic: theoretic and methodological analysis, polytheoretic synthesis, modeling. Empirical: research and generalization of the system, process and competence – based approaches experience, experiment, observation, surveys, expert evaluation, SWOT-analysis as a method of strategic planning which is to identify the internal and external factors (socio-cultural of the organization surrounding.Results. The strategy of the development of the process of quality control training in educational professional organizations and a predictive model of the system of quality control training for future engineers and workers have been created on the analysis and synthesis of a quantitative specification of the quality, the obtained experience and success in control training of future specialists in educational professional organizations in recent economic and educational conditions.Scientific novelty. There has been built a predicative model of quality control training of future specialists to meet modern standards and the principles of social partnership; the control algorithm of the learning process, developed in accordance with the standards (international of quality ISO in the implementation of the quality control systems of the process approach (matrix-based responsibility, competence and remit of those responsible for the education process in the educational organization, the «problem» terms and diagnostic tools for assessing the quality of professional training of future specialists. The perspective directions of innovation in the control of the quality of future professionals training have been determined; the parameters of a comprehensive analysis of the state of the system to ensure the

  13. Quality Control - Nike.Inc

    OpenAIRE

    Walter G. Bishop

    2017-01-01

    The purpose of this paper is to present the illustration of quality control approach, which has been adopted by several organizations, in order to manage and improve their production processes. The approach is referred as total quality management (TQM). This study will discuss the implementation of TQ, within the working environment of Nike Inc. One of the major objectives behind the implementation of TQ is to reduce or completely eliminate potential errors and flaws, within the manufacturing...

  14. Quality assurance, quality control and quality audit in diagnostic radiology

    International Nuclear Information System (INIS)

    Vassileva, J.

    2009-01-01

    Full text:The lecture aims to present contemporary view of quality assurance in X-Ray diagnosis and its practical realization in Bulgaria. In the lecture the concepts of quality assurance, quality control and clinical audit will be defined and their scope will be considered. An answer of the following questions will be given: why is it necessary to determine the dose of patient in X-ray studies, what is the reference dose level and how it is used for dosimetric quantity which characterized the patient's exposure in X-ray, mammography and CT scans and how they are measured, who conducted the measurement and how to keep the records, what are the variations of doses in identical tests and what defines them? The findings from a national survey of doses in diagnostic radiology, conducted in 2008-2009 and the developed new national reference levels will be presented. The main findings of the first tests of radiological equipment and the future role of quality control as well as the concept of conducting clinical audit and its role in quality assurance are also presented. Quality assurance of the diagnostic process with minimal exposure of patients is a strategic goal whose realization requires understanding, organization and practical action, both nationally and in every hospital. To achieve this the important role of education and training of physicians, radiological technicians and medical physicists is enhanced

  15. Quality control of imaging devices

    International Nuclear Information System (INIS)

    Soni, P.S.

    1992-01-01

    Quality assurance in nuclear medicine refers collectively to all aspects of a nuclear medicine service. It would include patient scheduling, radiopharmaceutical preparation and dispensing, radiation protection of patients, staff and general public, preventive maintenance and the care of instruments, methodology, data interpretation and records keeping, and many other small things which contribute directly or indirectly to the overall quality of a nuclear medicine service in a hospital. Quality Control, on the other hand, refers to a signal component of the system and is usually applied in relation to a specific instrument and its performance

  16. Quality control for dose calibrators

    International Nuclear Information System (INIS)

    Mendes, L.C.G.

    1984-01-01

    Nuclear medicine laboratories are required to assay samples of radioactivity to be administered to patients. Almost universally, these assays are accomplished by use of a well ionization chamber isotope calibrator. The Instituto de Radioprotecao e Dosimetria (Institute for Radiological Protection and Dosimetry) of the Comissao Nacional de Energia Nuclear (National Commission for Nuclear Energy) is carrying out a National Quality Control Programme in Nuclear Medicine, supported by the International Atomic Energy Agency. The assessment of the current needs and practices of quality control in the entire country of Brazil includes Dose Calibrators and Scintillation Cameras, but this manual is restricted to the former. Quality Control Procedures for these Instruments are described in this document together with specific recommendations and assessment of its accuracy. (author)

  17. New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom

    Energy Technology Data Exchange (ETDEWEB)

    Shandiz, Mahdi Heravian; Khalilzadeh, Mohammadmahdi; Anvari, Kazem [Mashhad Branch, Islamic Azad University, Mashhad (Iran, Islamic Republic of); Layen, Ghorban Safaeian [Mashhad University of Medical Science, Mashhad (Iran, Islamic Republic of)

    2015-03-15

    In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. The QA protocols, published by authoritative organizations, such as the American Association of Physicists in Medicine (AAPM), determine the quality control (QC) tests which should be performed on the medical linear accelerators and the threshold levels for each test. The purpose of this study is to increase the accuracy and precision of the selected QC tests in order to increase the quality of treatment and also increase the speed of the tests to convince the crowded centers to start a reliable QA program. A new method has been developed for two of the QC tests; optical distance indicator (ODI) QC test as a daily test and gantry angle QC test as a monthly test. This method uses an image processing approach utilizing the snapshots taken by the CCD camera to measure the source to surface distance (SSD) and gantry angle. The new method of ODI QC test has an accuracy of 99.95% with a standard deviation of 0.061 cm and the new method for gantry angle QC has a precision of 0.43 degrees. The automated proposed method which is used for both ODI and gantry angle QC tests, contains highly accurate and precise results which are objective and the human-caused errors have no effect on the results. The results show that they are in the acceptable range for both of the QC tests, according to AAPM task group 142.

  18. New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom

    International Nuclear Information System (INIS)

    Shandiz, Mahdi Heravian; Khalilzadeh, Mohammadmahdi; Anvari, Kazem; Layen, Ghorban Safaeian

    2015-01-01

    In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. The QA protocols, published by authoritative organizations, such as the American Association of Physicists in Medicine (AAPM), determine the quality control (QC) tests which should be performed on the medical linear accelerators and the threshold levels for each test. The purpose of this study is to increase the accuracy and precision of the selected QC tests in order to increase the quality of treatment and also increase the speed of the tests to convince the crowded centers to start a reliable QA program. A new method has been developed for two of the QC tests; optical distance indicator (ODI) QC test as a daily test and gantry angle QC test as a monthly test. This method uses an image processing approach utilizing the snapshots taken by the CCD camera to measure the source to surface distance (SSD) and gantry angle. The new method of ODI QC test has an accuracy of 99.95% with a standard deviation of 0.061 cm and the new method for gantry angle QC has a precision of 0.43 degrees. The automated proposed method which is used for both ODI and gantry angle QC tests, contains highly accurate and precise results which are objective and the human-caused errors have no effect on the results. The results show that they are in the acceptable range for both of the QC tests, according to AAPM task group 142.

  19. Statistical methods for quality assurance

    International Nuclear Information System (INIS)

    Rinne, H.; Mittag, H.J.

    1989-01-01

    This is the first German-language textbook on quality assurance and the fundamental statistical methods that is suitable for private study. The material for this book has been developed from a course of Hagen Open University and is characterized by a particularly careful didactical design which is achieved and supported by numerous illustrations and photographs, more than 100 exercises with complete problem solutions, many fully displayed calculation examples, surveys fostering a comprehensive approach, bibliography with comments. The textbook has an eye to practice and applications, and great care has been taken by the authors to avoid abstraction wherever appropriate, to explain the proper conditions of application of the testing methods described, and to give guidance for suitable interpretation of results. The testing methods explained also include latest developments and research results in order to foster their adoption in practice. (orig.) [de

  20. Validación de métodos analíticos para el control de calidad de naproxeno supositorios Validation of analytical methods for the quality control of Naproxen suppositories

    Directory of Open Access Journals (Sweden)

    Yaslenis Rodríguez Hernández

    2011-09-01

    Full Text Available En el presente trabajo se desarrollaron por primera vez, los métodos de análisis que serán utilizados para el control de calidad de las futuras formulaciones de supositorios de naproxeno, para uso infantil y adulto de producción nacional. Se propuso un método por espectrofotometría ultravioleta directa, el cual resultó específico, lineal, exacto y preciso para su aplicación en el control de calidad del naproxeno en supositorios, teniendo en cuenta la presencia de grupos cromóforos en su estructura. Se modificó el método por volumetría ácido-base semiacuosa directa reportado para control de calidad de la materia prima de naproxeno y se adaptó al control de calidad en los supositorios. A partir del proceso de validación realizado, se demostró la adecuada especificidad frente a los componentes de la formulación, así como su linealidad, exactitud y precisión en el rango de 1 a 3 mg/mL. Se compararon los resultados obtenidos por ambos métodos sin detectar diferencias estadísticamente significativas entre las réplicas analizadas por cada dosis, por lo que cualquiera de ellos pueden aplicarse al control de calidad de los supositorios.The analysis methods that will be used for the quality control of the future Cuban-made Naproxen suppositories for adults and children were developed for the first time in this paper. One method based on direct ultraviolet spectrophotometry was put forward, which proved to be specific, linear, accurate and precise for the quality control of Naproxen suppositories, taking into account the presence of chromophore groups in their structure. Likewise, the direct semi-aqueous acid-base volumetry method aimed at the quality control of the Naproxen raw material was changed and adapted to the quality control of suppositories. On the basis of the validation process, there was demonstrated the adequate specificity of this method with respect to the formulation components, as well as its linearity, accuracy and

  1. Frontiers in statistical quality control

    CERN Document Server

    Wilrich, Peter-Theodor

    1997-01-01

    Like the preceding volumes, and met with a lively response, the present volume is collecting contributions stressed on methodology or successful industrial applications. The papers are classified under four main headings: sampling inspection, process quality control, data analysis and process capability studies and finally experimental design.

  2. Comparison between sensitivities of quality control methods using ultrasonic waves, radiography and acoustic emission for the thick welded joint testing

    International Nuclear Information System (INIS)

    Asty, Michel; Birac, Claude

    1981-09-01

    The testing of the thick welded joints of the nuclear industry is carried out by radiography and ultrasonics on completion of welding. When a fault is found, its repair requires a sometimes deep cut down to the position of the fault, then filling in of the cut by hand welding with a coated electrode. This very costly operation also involves the risk of causing new defects when building up by hand. Listening to the acoustic emission during the welding has been considered in order to seek the possibility of detecting defects when they appear, or soon after. The industrial use of this method would make an instant repair of the defective areas possible at less cost and with greater reliability. The study presented concerns the comparison between the results of the various non-destructive testing methods: radiography, ultrasonics and acoustic emission, for a thick welded joint in which the defects have been brought about [fr

  3. Softcopy quality ruler method: implementation and validation

    Science.gov (United States)

    Jin, Elaine W.; Keelan, Brian W.; Chen, Junqing; Phillips, Jonathan B.; Chen, Ying

    2009-01-01

    A softcopy quality ruler method was implemented for the International Imaging Industry Association (I3A) Camera Phone Image Quality (CPIQ) Initiative. This work extends ISO 20462 Part 3 by virtue of creating reference digital images of known subjective image quality, complimenting the hardcopy Standard Reference Stimuli (SRS). The softcopy ruler method was developed using images from a Canon EOS 1Ds Mark II D-SLR digital still camera (DSC) and a Kodak P880 point-and-shoot DSC. Images were viewed on an Apple 30in Cinema Display at a viewing distance of 34 inches. Ruler images were made for 16 scenes. Thirty ruler images were generated for each scene, representing ISO 20462 Standard Quality Scale (SQS) values of approximately 2 to 31 at an increment of one just noticeable difference (JND) by adjusting the system modulation transfer function (MTF). A Matlab GUI was developed to display the ruler and test images side-by-side with a user-adjustable ruler level controlled by a slider. A validation study was performed at Kodak, Vista Point Technology, and Aptina Imaging in which all three companies set up a similar viewing lab to run the softcopy ruler method. The results show that the three sets of data are in reasonable agreement with each other, with the differences within the range expected from observer variability. Compared to previous implementations of the quality ruler, the slider-based user interface allows approximately 2x faster assessments with 21.6% better precision.

  4. Studies of quality control procedures for radiopharmaceuticals

    International Nuclear Information System (INIS)

    Zivanovic, M.; Trott, N.G.

    1983-01-01

    In this paper, a short description is given of a radiopharmaceutical preparation suite set up at the Royal Marsden Hospital and an account is presented of methods used for quality control of radiopharmaceuticals and of the results obtained over a period of about two and a half years

  5. Quality Assurance/Quality Control Jobs

    Science.gov (United States)

    Fanslau, Melody; Young, Janelle

    The production of a quality and safe food product is essential to the success of any food manufacturing facility. Because of this great importance, a career in quality can be extremely rewarding. Without happy customers willing to buy a product, a company would not be able to survive. Quality issues such as foreign objects, spoiled or mislabeled product, failure to meet net weight requirements, or a recall can all turn customers away from buying a product. The food industry is a customer-driven market in which some consumers are brand loyal based on a history of high quality or in which a single bad experience with a product will turn them away for a lifetime. With this said, the main role of a quality department is to help ensure that quality issues such as these are eliminated or kept to a minimum to maintain or increase the number of customers purchasing their product.

  6. Control of quality in mammography

    International Nuclear Information System (INIS)

    2006-10-01

    The present protocol of quality control/quality assurance in mammography is the result of the work of two regional projects realised in Latin America within the frame of ARCAL with the support of the IAEA. The first is ARCAL LV (RLA/6/043) project on quality assurance/quality control in mammography studies which analysed the present situation of the mammography in the member countries of the project which include: Bolivia, Colombia, Costa Rica, Cuba, El Salvador, Guatemala, Nicaragua, Panama, Paraguay, Peru, Dominican Republic and Republic of Venezuela and the second is ARCAL XLIX (RLA/9/035) project, whose members were Brazil, Colombia, Cuba, Chile, Mexico, and Peru, worked the application of Basic Safety Standards for the protection against ionising radiation with the aim to improve radiation protection in X-ray diagnosis medical practices through the implementation of the Basic Safety Standards (BSS) related to x-ray diagnosis in selected hospitals located in each country involved in the project. The work of both projects had been consolidated and harmonized in the present publication

  7. Power Quality Improvement Of Grid Integrated Type I Wind Turbine Generation System Operating as DSTATCOM by d-q Control Method

    Directory of Open Access Journals (Sweden)

    S V S Phani Kumar.Ch

    2016-06-01

    Full Text Available In recent years with the excessive consumption of electrical energy, the incongruity between generation and demand, the irrational structure of World’s energy as well as the environmental pollution have become progressively more evident. It has become crucial for ecological development to reduce the consumption of conventional energy and to enhance the development and utilization of renewable energy. Wind energy and Solar are unlimited supply of renewable energy and it has no pollution. But this concept suffer from the power quality issues from grid and generator side, this paper presents a control strategy for achieving maximum benefits from these grid-interfacing inverter when installed in 3-phase 4-wire distribution systems. The inverter can be controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1 power converter to inject power generated from RES to the grid and 2 shunt APF (Active Power Filter to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. The Paper propose design of 500kW Type I Wind Generation System 250kW each with Four Leg Inverter Controlled by d-q technique operated as DSTATCOM connected to 415V 4 wire Grid and also the results are compared with conventional Unit Vector Control. The proposed d-q method reduces the %THD of system to 1.97% from 24.12% where Unit Vector Control is of 3.94% which was on higher side , this is simulated in MATLAB/SIMULINK.

  8. quality control of the radiopharmaceuticals

    International Nuclear Information System (INIS)

    Boukarra, Hajer; Boubakri, Rania

    2006-01-01

    This work is a contribution to the quality control of two radio pharmaceutical. Our study was carried out on the rat. These results enable us to draw the following conclusions: - the control of the purity of the cerebral tracers (Cytectrenes) is carried out by HPLC by using a detector of radioactivity which offers a great sensitivity. - the radiochemical output of marking of Kit MDP determined by thin chromatography of layer is 99%. - The study of the biodistribution in the rat showed an affinity raised for the feet bone. - These results are in conformity with the European pharmacopoeia, which enables us to require a marketing authorization. (author)

  9. Validated spectroscopic methods for determination of anti-histaminic drug azelastine in pure form: Analytical application for quality control of its pharmaceutical preparations

    Science.gov (United States)

    El-Masry, Amal A.; Hammouda, Mohammed E. A.; El-Wasseef, Dalia R.; El-Ashry, Saadia M.

    2018-02-01

    Two simple, sensitive, rapid, validated and cost effective spectroscopic methods were established for quantification of antihistaminic drug azelastine (AZL) in bulk powder as well as in pharmaceutical dosage forms. In the first method (A) the absorbance difference between acidic and basic solutions was measured at 228 nm, whereas in the second investigated method (B) the binary complex formed between AZL and Eosin Y in acetate buffer solution (pH 3) was measured at 550 nm. Different criteria that have critical influence on the intensity of absorption were deeply studied and optimized so as to achieve the highest absorption. The proposed methods obeyed Beer's low in the concentration range of (2.0-20.0 μg·mL- 1) and (0.5-15.0 μg·mL- 1) with % recovery ± S.D. of (99.84 ± 0.87), (100.02 ± 0.78) for methods (A) and (B), respectively. Furthermore, the proposed methods were easily applied for quality control of pharmaceutical preparations without any conflict with its co-formulated additives, and the analytical results were compatible with those obtained by the comparison one with no significant difference as insured by student's t-test and the variance ratio F-test. Validation of the proposed methods was performed according the ICH guidelines in terms of linearity, limit of quantification, limit of detection, accuracy, precision and specificity, where the analytical results were persuasive. The absorption spectrum of AZL (16 μg·mL- 1) in 0.1 M HCl. The absorption spectrum of AZL (16 μg·mL- 1) in 0.1 M NaOH. The difference absorption spectrum of AZL (16 μg·mL- 1) in 0.1 M NaOH vs 0.1 M HCl. The absorption spectrum of eosin binary complex with AZL (10 μg·mL- 1).

  10. Radiation measurements and quality control

    International Nuclear Information System (INIS)

    McLaughlin, W.L.

    1977-01-01

    Accurate measurements are essential to research leading to a successful radiation process and to the commissioning of the process and the facility. On the other hand, once the process is in production, the importance to quality control of measuring radiation quantities (i.e., absorbed dose, dose rate, dose distribution) rather than various other parameters of the process (i.e. conveyor speed, dwell time, radiation field characteristics, product dimensions) is not clearly established. When the safety of the product is determined by the magnitude of the administered dose, as in radiation sterilization, waste control, or food preservation, accuracy and precision of the measurement of the effective dose are vital. Since physical dose measurements are usually simpler, more reliable and reproducible than biological testing of the product, there is a trend toward using standardized dosimetry for quality control of some processes. In many industrial products, however, such as vulcanized rubber, textiles, plastics, coatings, films, wire and cable, the effective dose can be controlled satisfactorily by controlling process variables or by product testing itself. In the measurement of radiation dose profiles by dosimetry, it is necessary to have suitable dose meter calibrations, to account for sources of error and imprecision, and to use correct statistical procedures in specifying dwell times or conveyor speeds and source and product parameters to achieve minimum and maximum doses within specifications. (author)

  11. Quality control of the activity meter

    International Nuclear Information System (INIS)

    Rodrigues, Marlon da Silva Brandão; Sá, Lídia Vasconcelos de

    2017-01-01

    Objective: To carry out a comparative analysis of national and international standards regarding the quality control of the activity meter used in Nuclear Medicine Services in Brazil. Material and methods: Quality control protocols from the International Atomic Energy Agency (IAEA), American Association of Physicists in Medicine (AAPM) and International Electrotechnical Commission (IEC) were pointed out and compared with requirements from both regulatory Brazilian agencies, National Surveillance Agency (ANVISA) and National Nuclear Energy Commission (CNEN). Results: The daily routine tests recommended by the regulatory agencies do not have significant differences; in contrast the tests with higher periodicities like (accuracy, linearity and precision) have differences discrepant. Conclusion: In view of the comparative analysis carried out, it is suggested that the national recommendations for the quality control tests of the activity meter should be checked and evaluated, with emphasis on the semiannual and annual periodicity tests. (author)

  12. Quality control of 11C-carfentanil

    International Nuclear Information System (INIS)

    Zhang Xiaojun; Zhang Jinming; Tian Jiahe; Xiang Xiaohui

    2013-01-01

    To study the quality control of 11 C-Carfentanil injection, physical, chemical and biological identification were used. The chemical and radiochemical purity of 11 C-Carfentanil Injection were detected by HPLC and Flower Count system; measured the quantity of product by LC-MS, specific activity was calculated later; The PTS was used to detect endotoxin, and other quality control methods were put up to guarantee the security of its clinical application. The produce appeared colorless and transparent, the radiochemical purity was more than 98%, content of the endotoxin was less than 5 EU/mL. The result showed that 11 C-Carfentanil injection had fulfilled pharmaceutical quality control request and could be applied safely to animal experiment and clinical diagnosis. (authors)

  13. 7 CFR 58.442 - Laboratory and quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Laboratory and quality control tests. 58.442 Section... Service 1 Operations and Operating Procedures § 58.442 Laboratory and quality control tests. (a) Chemical... Methods or by other methods giving equivalent results. (b) Weight or volume control. Representative...

  14. Evaluation of yield quality and weed infestation of common valerian (Valeriana officinalis L. in dependence on weed control method and forecrop.

    Directory of Open Access Journals (Sweden)

    Cezary Kwiatkowski

    2012-12-01

    Full Text Available A field experiment involving the cultivation of common valerian was conducted on loess soil in Abramów (Lublin region in the period 2007-2009. Qualitative parameters of herbal raw material obtained from this plant as well as in-crop weed infestation were evaluated depending on the protection method and forecrop. Hand-weeded plots, in which a hand hoe was used, were the control. In the other treatments, weeds were controlled using various herbicides and a mechanical implement (brush weeder. Potato and winter wheat + field pea cover crop were the forecrops for common valerian crops. A hypothesis was made that the use of a brush weeder and herbicides not registered for application in valerian crops would have a positive effect on this plant's productivity and weed infestation in its crops. It was also assumed that the introduction of a cover crop would allow the elimination of differences in the forecrop value of the crop stands in question. The best quantitative and qualitative parameters of common valerian raw material as well as the largest reduction of incrop weed infestation were recorded after the application of the herbicides which were not type approved. The use of the brush weeder in the interrows also had a beneficial effect on productivity of the plant in question, but secondary weed infestation at the end of the growing season of common valerian turned out to be its disadvantage. Traditional crop protection methods used in common valerian crops were less effective in weed infestation reduction and they resulted in lower plant productivity and raw material quality. Potato proved to be a better forecrop for common valerian than winter wheat + field pea; however, this positive effect was not confirmed statistically. The following annual weeds: Chenopodium album, Galinsoga parviflora, Stellaria media, were predominant in the common valerian crop. Traditional weed control methods resulted in the dominance of some dicotyledonous weeds, such

  15. Control cards as a statistical quality control resource

    Directory of Open Access Journals (Sweden)

    Aleksandar Živan Drenovac

    2013-02-01

    Full Text Available Normal 0 false false false MicrosoftInternetExplorer4 This paper proves that applying of statistical methods can significantly contribute increasing of products and services quality, as well as increasing of institutions rating. Determining of optimal, apropos anticipatory and limitary values, is based on sample`s statistical analyze. Control cards represent very confident instrument, which is simple for use and efficient for control of process, by which process is maintained in set borders. Thus, control cards can be applied in quality control of procesess of weapons and military equipment production, maintenance of technical systems, as well as for seting of standards and increasing of quality level for many other activities.

  16. Quality control in nuclear medicine

    International Nuclear Information System (INIS)

    Kostadinova, I.

    2007-01-01

    Nuclear medicine comprises diagnosis and therapy of the diseases with radiopharmaceuticals. The ambition of all specialists in our country is their activity to reach European standards. In this connection, a Commission for external audit was formed to evaluate the quality of work in the centers of nuclear medicine. This Commission create a long-lasting programme based on the objective European criteria and the national standard of nuclear medicine, having in mind to increase quality of the work and the expert evaluation of activity in every center. The program comprises measures for quality control of instrumentation, radiopharmaceuticals, performed investigations, obtained results and the whole organization from the receiving of the isotopes to the results of the patients. The ambition is most of the centers to fulfill the requirements. As a conclusion it could be said that not only the quality of everyday nuclear medicine work is enough to increase the prestige of the specialty. It is also necessary we to have understanding expert and financial support from corresponding institutions, incl. Ministry of health for a delivery of a new, contemporary instrumentation with new possibilities. Thus it would be possible Bulgarian patients to reach the high technology apparatuses for an early functional diagnosis of the diseases and optimal treatment, which possibility have the patients from the developed countries. (author)

  17. Quality control programme for radiotherapy

    International Nuclear Information System (INIS)

    Campos de Araujo, A.M.; Viegas, C.C.B.; Viamonte, A.M.

    2002-01-01

    A 3 years pilot programme started in January 2000 with 33 philanthropic cancer institutions that provides medical services to 60% of the patients from the national social security system. Brazil has today 161 radiotherapy services (144 operating with megavoltage equipment). These 33 institutions are distributed over 19 Brazilian states. The aim of this programme is: To create conditions to allow the participants to apply the radiotherapy with quality and efficacy; To promote up dating courses for the physicians, physicists and technicians of these 33 Institutions. With the following objectives: To recommend dosimetric and radiological protection procedures in order to guarantee the tumor prescribed dose and safe working conditions; To help in establishing and implementing these procedures. The main activities are: local quality control evaluations, postal TLD audits in reference conditions, postal TLD audits in off axis conditions and training. The local quality control program has already evaluated 22 institutions with 43 machines (25 Co-60 and 18 linear accelerators). In these visits we perform dosimetric, electrical, mechanical and safety tests. As foreseen, we found more problems among the old Co-60 machines i.e., field flatness, size, symmetry and relative output factors; lasers positioning system alignment; optical distance indicator; radiation and light field coincidence; optical and mechanical distance indicators agreement, than among the linear accelerators i.e., field flatness and size; lasers positioning system alignment; tray interlocking and wedge filter factors

  18. Family Control and Earnings Quality

    Directory of Open Access Journals (Sweden)

    Carolina Bona Sánchez

    2007-06-01

    Full Text Available El trabajo analiza la relación entre el control familiar y la calidad de la información contable en un contexto en el que el tradicional conflicto de agencia entre directivos y accionistas se desplaza a la divergencia de intereses entre accionistas controladores y minoritarios. Los resultados alcanzados muestran que, en comparación con las no familiares, las empresas de naturaleza familiar divulgan unos resultados de mayor calidad, tanto en términos de menores ajustes por devengo discrecionales como de mayor capacidad de los componentes actuales del resultado para predecir los cash flows futuros. Además, el aumento en los derechos de voto en manos de la familia controladora incrementa la calidad de los resultados contables. La evidencia obtenida se muestra consistente con la presencia de un efecto reputación/vinculación a largo plazo asociado a la empresa familiar. Adicionalmente, el trabajo refleja que a medida que disminuye la divergencia entre los derechos de voto y de cash flow en manos de la familia controladora, aumenta la calidad de la información contable.PALABRAS CLAVE: derechos de voto, divergencia, empresa familiar, calidad delresultado, reputación, beneficios privados.This work examines the relationship between family control and earnings quality in a context where the salient agency problem shifts away from the classical divergence between managers and shareholders to conflicts between the controlling owner and minority shareholders. The results reveal that, compared to non-family firms, family firms reveal higher earnings quality in terms of both lower discretionary accruals and greater predictability of future cash flows. They also show a positive relationship between the level of voting rights held by the controlling family and earnings quality. The evidence is consistent with the presence of a reputation/long-term involvement effect associated with the family firm. Moreover, the work reflects that, as the divergence

  19. Determination and evaluation of air quality control. Manual of ambient air quality control in Germany

    Energy Technology Data Exchange (ETDEWEB)

    Lahmann, E.

    1997-07-01

    Measurement of air pollution emissions and ambient air quality are essential instruments for air quality control. By undertaking such measurements, pollutants are registered both at their place of origin and at the place where they may have an effect on people or the environment. Both types of measurement complement each other and are essential for the implementation of air quality legislation, particularly, in compliance with emission and ambient air quality limit values. Presented here are similar accounts of measurement principles and also contains as an Appendix a list of suitability-tested measuring devices which is based on information provided by the manufacturers. In addition, the guide of ambient air quality control contains further information on discontinuous measurement methods, on measurement planning and on the assessment of ambient air quality data. (orig./SR)

  20. Quality control in breast tomosynthesis

    International Nuclear Information System (INIS)

    Jakubiak, Rosangela Requi; Messias, Pricila Cordeiro; Santos, Marilia Fernanda; Urban, Linei Augusta B.D.

    2014-01-01

    In Brazil breast cancer is the most common and the leading cause of death among women, with estimated 57,000 new cases in 2014. The mammography (2D) plays an important role in the early detection of breast cancer, but in some cases can be difficult to detect malignant lesions due overlap of breast tissues. The Breast Digital Tomosynthesis (BDT: 3D) reduces the effects of overlap, providing improved characterization of mammographic findings. However, the dose may double as compared to the mammography. This study presents results of Contrast Ratio Noise tests (CRN) and quality image on a Siemens mammography equipment Mammomat Inspiration with tomosynthesis. The CRN was determined with plates Polymethylmethacrylate (PMMA) of 20 to 70 mm thickness and an aluminum plate of 10 mm 2 and 0.2 mm thickness. Image quality was assessed with the ACR Breast Simulator. In assessment of image quality, the detectability of fibers and masses was identical in 2D and 3D systems. Were visualized 4.5 fibers and 4 mass in both modes. In 2D mode groups have been identified 3.5 microcalcifications, and 3D were 3 groups. The Mean Glandular Dose for the simulator in 2D mode was 1.17 mGy and 2.35 mGy for the 3D mode. The result reinforces the importance of quality control in the process of obtaining the images and obtained in accordance CRN values, ensuring image quality and dose compatible in 2D and 3D processes

  1. Quality control in breast tomosynthesis

    Energy Technology Data Exchange (ETDEWEB)

    Jakubiak, R.R.; Messias, P.C.; Santos, M.F., E-mail: requi@utfpr.edu.br [Universidade Tecnologia Federal do Parana (UTFPR), Curitiba, PR (Brazil). Departamento Academico de Fisica; Urban, L.A.B.D., E-mail: lineiurban@hotmail.com [Diagnostico Avancado por Imagem, Curitiba, PR (Brazil)

    2015-07-01

    In Brazil, breast cancer is the most common and the leading cause of death among women, with estimated 57,000 new cases in 2014. The mammography (2D) plays an important role in the early detection of breast cancer, but in some cases can be difficult to detect malignant lesions due overlap of breast tissues. The Digital Breasts Tomosynthesis (DBT: 3D) reduces the effects of overlap, providing improved characterization of mammographic findings. However, the dose may double as compared with mammography. This study presents results of Contrast to Noise Ratio (CNR) and image quality evaluation on Siemens mammography equipment Mammomat Inspiration with tomosynthesis. The CNR was determined with Polymethylmethacrylate (PMMA) layers of 20 to 70 mm thick and an aluminum foils of 0,2 mm thickness and area of 10 mm². Image quality was assessed with the ACR Breast Simulator. In the evaluation of image quality, the detectability of fibers and masses was identical in 2D and 3D systems. Displaying fibers were 4,5 and 4 mass in both modes. In 2D mode were identified 3,5 microcalcifications groups, and 3D showed 3 groups. The Mean Glandular Dose (MGD) for the simulator in 2D mode was 1,17 mGy and 2,35 mGy for the 3D mode. The result reinforces the importance of quality control in the process of obtaining the images and obtained in accordance CNR values, ensuring image quality and compatible dose in 2D and 3D processes. (author)

  2. Quality control in breast tomosynthesis

    International Nuclear Information System (INIS)

    Jakubiak, R.R.; Messias, P.C.; Santos, M.F.

    2015-01-01

    In Brazil, breast cancer is the most common and the leading cause of death among women, with estimated 57,000 new cases in 2014. The mammography (2D) plays an important role in the early detection of breast cancer, but in some cases can be difficult to detect malignant lesions due overlap of breast tissues. The Digital Breasts Tomosynthesis (DBT: 3D) reduces the effects of overlap, providing improved characterization of mammographic findings. However, the dose may double as compared with mammography. This study presents results of Contrast to Noise Ratio (CNR) and image quality evaluation on Siemens mammography equipment Mammomat Inspiration with tomosynthesis. The CNR was determined with Polymethylmethacrylate (PMMA) layers of 20 to 70 mm thick and an aluminum foils of 0,2 mm thickness and area of 10 mm². Image quality was assessed with the ACR Breast Simulator. In the evaluation of image quality, the detectability of fibers and masses was identical in 2D and 3D systems. Displaying fibers were 4,5 and 4 mass in both modes. In 2D mode were identified 3,5 microcalcifications groups, and 3D showed 3 groups. The Mean Glandular Dose (MGD) for the simulator in 2D mode was 1,17 mGy and 2,35 mGy for the 3D mode. The result reinforces the importance of quality control in the process of obtaining the images and obtained in accordance CNR values, ensuring image quality and compatible dose in 2D and 3D processes. (author)

  3. Quality Control and Quality Assurance of Radiation Oncology

    International Nuclear Information System (INIS)

    Abaza, A.

    2016-01-01

    Radiotherapy (RT) has played important roles in cancer treatment for more than one century. The development of RT techniques allows high-dose irradiation to tumors while reducing the radiation doses delivered to surrounding normal tissues. However, RT is a complex process and involves understanding of the principles of medical physics, radiobiology, radiation safety, dosimetry, radiation treatment planning, simulation and interaction of radiation with other treatment modalities. Each step in the integrated process of RT needs quality control and quality assurance (QA) to prevent errors and to ensure that patients will receive the prescribed treatment correctly. The aim of this study is to help the radio therapists in identifying a system for QA that balances patient safety and quality with available resources. Recent advances in RT focus on the need for a systematic RT QA program that balances patient safety and quality with available resources. It is necessary to develop more formal error mitigation and process analysis methods, such as failure mode and effect analysis (FMEA), to focus available QA resources optimally on the process components. External audit programs are also effective. Additionally, Clinical trial QA has a significant role in enhancing the quality of care. The International Atomic Energy Agency (IAEA) has operated both an on-site and off-site postal dosimetry audit to improve practice and to assure the dose from RT equipment. Both postal dosimetry audit and clinical trial RTQA, especially for advanced technologies, in collaboration with global networks, will serve to enhance patient safety and quality of care

  4. 40 CFR 51.359 - Quality control.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 2 2010-07-01 2010-07-01 false Quality control. 51.359 Section 51.359....359 Quality control. Quality control measures shall insure that emission testing equipment is calibrated and maintained properly, and that inspection, calibration records, and control charts are...

  5. Quality-control analytical methods: endotoxins: essential testing for pyrogens in the compounding laboratory, part 3: a simplified endotoxin test method for compounded sterile preparations.

    Science.gov (United States)

    Cooper, James F

    2011-01-01

    The first two parts of the IJPC series on endotoxin testing explained the nature of pyrogenic contamination and described various Limulus amebocyte lysate methods for detecting and measuring endotoxin levels with the bacterial endotoxin test described in the United States Pharmacopeia. This third article in that series describes the endotoxin test that is simplest to permorm for pharmacists who prefer to conduct an endotoxin assa at the time of compounding in the pharmacy setting.

  6. Quality control of PET/CT

    International Nuclear Information System (INIS)

    Angelova, J.; Zajcharov, M.

    2013-01-01

    Full text: Introduction: The aim of this work is to undertake a review of the methods for checking and adjusting the computer and positron emission tomography in the Hospital 'Alexandrovska' by the attached to the equipment phantoms according to the manufacturer prescription in order to fulfill its requirements for the entry of the main parameters image within certain limits. Materials and Methods: At the start of work a check of the lasers setting for patient positioning and 'heat' of the X-ray tube scanner to better image quality were made. Daily verification procedures on the image quality of CT through the water phantom and weekly - 'air' calibration were carried out. In positron part, daily control involves setting the resolution and sensitivity of the scanner through built Ga68 phantom. When commissioning, after repair and at least once a year, it is necessary to verify the accuracy of registration of the pulses from the crystal with a water phantom of known volume and the coincidence between CT and PET image. Results: The process of quality control is interactive. The results are displayed in tables and graphically, with the goal the individual values to fall within the determined by manufacturers range and to meet the standards for image quality. If necessary, the procedure repeats several times until it is fulfilled. Conclusion: Ensuring the quality of the image in positron emission tomography combined with computed tomography, is inextricably linked to accurate and precise diagnosis of tumor processes in the human body

  7. 2. Product quality control and assurance system

    International Nuclear Information System (INIS)

    1990-01-01

    Product quality control and assurance are dealt with in relation to reliability in nuclear power engineering. The topics treated include product quality control in nuclear power engineering, product quality assurance of nuclear power plant equipment, quality assurance programs, classification of selected nuclear power equipment, and standards relating to quality control and assurance and to nuclear power engineering. Particular attention is paid to Czechoslovak and CMEA standards. (P.A.). 2 figs., 1 tab., 12 refs

  8. Internal quality control: best practice.

    Science.gov (United States)

    Kinns, Helen; Pitkin, Sarah; Housley, David; Freedman, Danielle B

    2013-12-01

    There is a wide variation in laboratory practice with regard to implementation and review of internal quality control (IQC). A poor approach can lead to a spectrum of scenarios from validation of incorrect patient results to over investigation of falsely rejected analytical runs. This article will provide a practical approach for the routine clinical biochemistry laboratory to introduce an efficient quality control system that will optimise error detection and reduce the rate of false rejection. Each stage of the IQC system is considered, from selection of IQC material to selection of IQC rules, and finally the appropriate action to follow when a rejection signal has been obtained. The main objective of IQC is to ensure day-to-day consistency of an analytical process and thus help to determine whether patient results are reliable enough to be released. The required quality and assay performance varies between analytes as does the definition of a clinically significant error. Unfortunately many laboratories currently decide what is clinically significant at the troubleshooting stage. Assay-specific IQC systems will reduce the number of inappropriate sample-run rejections compared with the blanket use of one IQC rule. In practice, only three or four different IQC rules are required for the whole of the routine biochemistry repertoire as assays are assigned into groups based on performance. The tools to categorise performance and assign IQC rules based on that performance are presented. Although significant investment of time and education is required prior to implementation, laboratories have shown that such systems achieve considerable reductions in cost and labour.

  9. 14 CFR 21.139 - Quality control.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Quality control. 21.139 Section 21.139... PROCEDURES FOR PRODUCTS AND PARTS Production Certificates § 21.139 Quality control. The applicant must show that he has established and can maintain a quality control system for any product, for which he...

  10. 7 CFR 930.44 - Quality control.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 8 2010-01-01 2010-01-01 false Quality control. 930.44 Section 930.44 Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Marketing Agreements... Control § 930.44 Quality control. (a) Quality standards. The Board may establish, with the approval of the...

  11. 33 CFR 385.21 - Quality control.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Quality control. 385.21 Section... Processes § 385.21 Quality control. (a) The Corps of Engineers and the non-Federal sponsor shall prepare a quality control plan, in accordance with applicable Corps of Engineers regulations, for each product that...

  12. 7 CFR 981.42 - Quality control.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 8 2010-01-01 2010-01-01 false Quality control. 981.42 Section 981.42 Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Marketing Agreements... Regulating Handling Quality Control § 981.42 Quality control. (a) Incoming. Except as provided in this...

  13. Association between product quality control and process quality control of bulk milk

    NARCIS (Netherlands)

    Velthuis, A.; Asseldonk, van M.A.P.M.

    2010-01-01

    Assessment of dairy-milk quality is based on product quality control (testing bulk-milk samples) and process quality control (auditing dairy farms). It is unknown whether process control improves product quality. To quantify possible association between product control and process control a

  14. Concrete and steel construction quality control and assurance

    CERN Document Server

    El-Reedy, Mohamed A

    2014-01-01

    Starting with the receipt of materials and continuing all the way through to the final completion of the construction phase, Concrete and Steel Construction: Quality Control and Assurance examines all the quality control and assurance methods involving reinforced concrete and steel structures. This book explores the proper ways to achieve high-quality construction projects, and also provides a strong theoretical and practical background. It introduces information on quality techniques and quality management, and covers the principles of quality control. The book presents all of the quality control and assurance protocols and non-destructive test methods necessary for concrete and steel construction projects, including steel materials, welding and mixing, and testing. It covers welding terminology and procedures, and discusses welding standards and procedures during the fabrication process, as well as the welding codes. It also considers the total quality management system based on ISO 9001, and utilizes numer...

  15. Reliability of nucleic acid amplification methods for detection of Chlamydia trachomatis in urine: results of the first international collaborative quality control study among 96 laboratories

    NARCIS (Netherlands)

    R.P.A.J. Verkooyen (Roel); G.T. Noordhoek; P.E. Klapper; J. Reid; J. Schirm; G.M. Cleator; M. Ieven; G. Hoddevik

    2003-01-01

    textabstractThe first European Quality Control Concerted Action study was organized to assess the ability of laboratories to detect Chlamydia trachomatis in a panel of urine samples by nucleic acid amplification tests (NATs). The panel consisted of lyophilized urine samples,

  16. Methods in Logic Based Control

    DEFF Research Database (Denmark)

    Christensen, Georg Kronborg

    1999-01-01

    Desing and theory of Logic Based Control systems.Boolean Algebra, Karnaugh Map, Quine McClusky's algorithm. Sequential control design. Logic Based Control Method, Cascade Control Method. Implementation techniques: relay, pneumatic, TTL/CMOS,PAL and PLC- and Soft_PLC implementation. PLC...

  17. Internal quality control: planning and implementation strategies.

    Science.gov (United States)

    Westgard, James O

    2003-11-01

    The first essential in setting up internal quality control (IQC) of a test procedure in the clinical laboratory is to select the proper IQC procedure to implement, i.e. choosing the statistical criteria or control rules, and the number of control measurements, according to the quality required for the test and the observed performance of the method. Then the right IQC procedure must be properly implemented. This review focuses on strategies for planning and implementing IQC procedures in order to improve the quality of the IQC. A quantitative planning process is described that can be implemented with graphical tools such as power function or critical-error graphs and charts of operating specifications. Finally, a total QC strategy is formulated to minimize cost and maximize quality. A general strategy for IQC implementation is recommended that employs a three-stage design in which the first stage provides high error detection, the second stage low false rejection and the third stage prescribes the length of the analytical run, making use of an algorithm involving the average of normal patients' data.

  18. Developing a TQM quality management method model

    NARCIS (Netherlands)

    Zhang, Zhihai

    1997-01-01

    From an extensive review of total quality management literature, the external and internal environment affecting an organization's quality performance and the eleven primary elements of TQM are identified. Based on the primary TQM elements, a TQM quality management method model is developed. This

  19. Coastal Erosion Control Methods

    Science.gov (United States)

    Greene, V.

    2016-12-01

    Coastal erosion is bad because the ecosystem there will be washed away and the animals could drown or be displaced and have to adapt to a new ecosystem that they are not prepared for. I'm interested in this problem because if there aren't beaches when I grow up I won't be able to do the things I would really like to do. I would like to be a marine biologist. Secondly, I don't want to see beach houses washed away. I would like to see people live in harmony with their environment. So, to study ways in which to preserve beaches I will make and use models that test different erosion controls. Two different ideas for erosion control I tested are using seaweed or a rock berm. I think the rock berm will work better than the model of seaweed because the seaweed is under water and the waves can carry the sand over the seaweed, and the rock berm will work better because the rocks will help break the waves up before they reach the shore and the waves can not carry the sand over the rocks that are above the water. To investigate this I got a container to use to model the Gulf of Mexico coastline. I performed several test runs using sand and water in the container to mimic the beach and waves from the Gulf of Mexico hitting the shoreline. I did three trials for the control (no erosion control), seaweed and a rock berm. Rock berms are a border of a raised area of rock. The model for seaweed that I used was plastic shopping bags cut into strips and glued to the bottom of my container to mimic seaweed. My results were that the control had the most erosion which ranged from 2.75 - 3 inches over 3 trials. The seaweed was a little better than the control but was very variable and ranged from 1.5 - 3 inches over 3 trials. The rock berm worked the best out of all at controlling erosion with erosion ranging from 1.5 - 2 inches. My hypothesis was correct because the rock berm did best to control erosion compared to the control which had no erosion control and the model with seaweed.

  20. Quality control analysis at the hospital

    International Nuclear Information System (INIS)

    Kristensen, K.

    1979-01-01

    Quality control analysis is an integral part of quality assurance. In a system as with radiopharmaceuticals where part of the finishing of the product takes place at individual hospitals, the need for quality control analysis at the hospital can be discussed. Data are presented that stresses the importance of quality control by the manufacturer as a basis for limitation of such work at hospitals. A simplified programme is proposed

  1. Quality control guarantees the safety of radiotherapy

    International Nuclear Information System (INIS)

    Aaltonen, P.

    1994-01-01

    While radiotherapy equipment has seen some decisive improvements in the last few decades, the technology has also become more complicated. The advanced equipment produces increasingly good treatment results, but the condition of the equipment must be controlled efficiently so as to eliminate any defects that might jeopardise patient safety. The quality assurance measures that are taken to show that certain equipment functions as required are known as quality control. The advanced equipment and stricter requirements set for the precision of radiotherapy have meant that more attention must be paid to quality control. The present radiation legislation stipulates that radiotherapy equipment must undergo regular quality control. The implementation of the quality control is supervised by the Finnish Centre for Radiation and Nuclear Safety (STUK). Hospitals carry out quality control in accordance with a programme approved by STUK, and STUK inspectors periodically visit hospitals to check the results of quality control. (orig.)

  2. Radiopharmaceutical quality control-Pragmatic approach

    International Nuclear Information System (INIS)

    Barbier, Y.

    1994-01-01

    The quality control must be considered in a practical manner. The radiopharmaceuticals are drugs. They must satisfy the quality assurance control. These products are then conform to Pharmacopeia. But sometimes the user must control some data especially radiochemical purity and pH value. On all the administered solutions four controls are compulsory: radionuclide identity, administered radioactivity, organoleptic character and pH

  3. Expert database system for quality control

    Science.gov (United States)

    Wang, Anne J.; Li, Zhi-Cheng

    1993-09-01

    There are more competitors today. Markets are not homogeneous they are fragmented into increasingly focused niches requiring greater flexibility in the product mix shorter manufacturing production runs and above allhigher quality. In this paper the author identified a real-time expert system as a way to improve plantwide quality management. The quality control expert database system (QCEDS) by integrating knowledge of experts in operations quality management and computer systems use all information relevant to quality managementfacts as well as rulesto determine if a product meets quality standards. Keywords: expert system quality control data base

  4. APPLICATION OF HIDDEN MARKOV CHAINS IN QUALITY CONTROL

    Directory of Open Access Journals (Sweden)

    Hanife DEMIRALP

    2013-01-01

    Full Text Available The ever growing technological innovations and sophistication in industrial processes require adequate checks on quality. Thus, there is an increasing demand for simple and efficient quality control methods. In this regard the control charts stand out in simplicity and efficiency. In this paper, we propose a method of controlling quality based on the theory of hidden Markov chains. Based on samples drawn at different times from the production process, the method obtains the state of the process probabilistically. The main advantage of the method is that it requires no assumption on the normality of the process output.

  5. 30 CFR 74.6 - Quality control.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Quality control. 74.6 Section 74.6 Mineral... of the CMDPSU will be maintained in production through adequate quality control procedures, MSHA and... DUST SAMPLING DEVICES Approval Requirements for Coal Mine Dust Personal Sampler Unit § 74.6 Quality...

  6. Employee quality, monitoring environment and internal control

    OpenAIRE

    Chunli Liu; Bin Lin; Wei Shu

    2017-01-01

    We investigate the effect of internal control employees (ICEs) on internal control quality. Using special survey data from Chinese listed firms, we find that ICE quality has a significant positive influence on internal control quality. We examine the effect of monitoring on this result and find that the effect is more pronounced for firms with strict monitoring environments, especially when the firms implement the Chinese internal control regulation system (CSOX), have higher institutional ow...

  7. Quality control in tile production

    Science.gov (United States)

    Kalviainen, Heikki A.; Kukkonen, Saku; Hyvarinen, Timo S.; Parkkinen, Jussi P. S.

    1998-10-01

    This work studies visual quality control in ceramics industry. In tile manufacturing, it is important that in each set of tiles, every single tile looks similar. For example, the tiles should have similar color and texture. Our goal is to design a machine vision system that can estimate the sufficient similarity or same appearance to the human eye. Currently, the estimation is usually done by human vision. Differing from other approaches our aim is to use accurate spectral representation of color, and we are comparing spectral features to the RGB color features. A laboratory system for color measurement is built. Experimentations with five classes of brown tiles are presented. We use chromaticity RGB features and several spectral features for classification with the k-NN classifier and with a neural network, called Self-Organizing Map. We can classify many of the tiles but there are several problems that need further investigations: larger training and test sets are needed, illuminations effects must be studied further, and more suitable spectral features are needed with more sophisticated classifiers. It is also interesting to develop further the neural approach.

  8. Chemical control methods and tools

    Science.gov (United States)

    Steven Manning; James. Miller

    2011-01-01

    After determining the best course of action for control of an invasive plant population, it is important to understand the variety of methods available to the integrated pest management professional. A variety of methods are now widely used in managing invasive plants in natural areas, including chemical, mechanical, and cultural control methods. Once the preferred...

  9. Distributed sensor architecture for intelligent control that supports quality of control and quality of service.

    Science.gov (United States)

    Poza-Lujan, Jose-Luis; Posadas-Yagüe, Juan-Luis; Simó-Ten, José-Enrique; Simarro, Raúl; Benet, Ginés

    2015-02-25

    This paper is part of a study of intelligent architectures for distributed control and communications systems. The study focuses on optimizing control systems by evaluating the performance of middleware through quality of service (QoS) parameters and the optimization of control using Quality of Control (QoC) parameters. The main aim of this work is to study, design, develop, and evaluate a distributed control architecture based on the Data-Distribution Service for Real-Time Systems (DDS) communication standard as proposed by the Object Management Group (OMG). As a result of the study, an architecture called Frame-Sensor-Adapter to Control (FSACtrl) has been developed. FSACtrl provides a model to implement an intelligent distributed Event-Based Control (EBC) system with support to measure QoS and QoC parameters. The novelty consists of using, simultaneously, the measured QoS and QoC parameters to make decisions about the control action with a new method called Event Based Quality Integral Cycle. To validate the architecture, the first five Braitenberg vehicles have been implemented using the FSACtrl architecture. The experimental outcomes, demonstrate the convenience of using jointly QoS and QoC parameters in distributed control systems.

  10. Distributed Sensor Architecture for Intelligent Control that Supports Quality of Control and Quality of Service

    Directory of Open Access Journals (Sweden)

    Jose-Luis Poza-Lujan

    2015-02-01

    Full Text Available This paper is part of a study of intelligent architectures for distributed control and communications systems. The study focuses on optimizing control systems by evaluating the performance of middleware through quality of service (QoS parameters and the optimization of control using Quality of Control (QoC parameters. The main aim of this work is to study, design, develop, and evaluate a distributed control architecture based on the Data-Distribution Service for Real-Time Systems (DDS communication standard as proposed by the Object Management Group (OMG. As a result of the study, an architecture called Frame-Sensor-Adapter to Control (FSACtrl has been developed. FSACtrl provides a model to implement an intelligent distributed Event-Based Control (EBC system with support to measure QoS and QoC parameters. The novelty consists of using, simultaneously, the measured QoS and QoC parameters to make decisions about the control action with a new method called Event Based Quality Integral Cycle. To validate the architecture, the first five Braitenberg vehicles have been implemented using the FSACtrl architecture. The experimental outcomes, demonstrate the convenience of using jointly QoS and QoC parameters in distributed control systems.

  11. Chemical and physical quality control of the HIPPURAN-131I

    International Nuclear Information System (INIS)

    Morin Zorilla, J.; Olive, E.; Isaac, M.; Cruz, J.

    1989-01-01

    Some physico-chemical methods for analytical control of Hippuran- 131 I are compared. The most convenient to applicate in hospitals and in more specialized quality control laboratories are recommended. The quality of Hippuran- 131 I produced by ISOTOP (USSR) is also evaluated. The product met the requirement of the International Pharmacopeia

  12. Quality demands and methods of control in the case of welded plastic-casing pipe joints. Part 1. Kontrolmetoder og kvalitetskrav til svejste kapperoerssamlinger af plast. 1. delrapport

    Energy Technology Data Exchange (ETDEWEB)

    Ross, P.; Svanum, M.

    1983-03-15

    The aim of the literary study was to attain knowledge relevant to the production and utilization of pre-insulated district heating pipes coated with polyethylene. Methods of testing for longevity and quality in addition to an evaluation of welding processes were also studied. It was concluded that welders should be specially trained and follow clearly specified working procedures and that their equipment should be standardized. (AB).

  13. Quality control concept for radioactive waste packages

    International Nuclear Information System (INIS)

    Warnecke, E.; Martens, B.R.; Odoj, R.

    1990-01-01

    In the Federal Republic of Germany a contract with the BfS for the performance of quality control measures is necessary. It is principally possible to apply two alternative methods: random checks on waste packages or qualification of conditioning processes with subsequent inspections. Priority is given to the control by the process qualification. Both methods have successfully been developed in the Federal Republic of Germany and can be applied. In the course of the qualification of conditioning processes it must be demonstrated by inactive and/or active runs that waste packages are produced which fulfil the waste acceptance requirements. The qualification results in the fixation of a handbook for the operation of the respective conditioning process including the process instrumentation and the operational margins. The qualified process will be inspected to assure the compliance of the actual operation with the conditions fixed in the handbook. (orig./DG)

  14. Birth control - slow release methods

    Science.gov (United States)

    Contraception - slow-release hormonal methods; Progestin implants; Progestin injections; Skin patch; Vaginal ring ... might want to consider a different birth control method. SKIN PATCH The skin patch is placed on ...

  15. Shipping/Receiving and Quality Control

    Data.gov (United States)

    Federal Laboratory Consortium — Shipping receiving, quality control, large and precise inspection and CMM machines. Coordinate Measuring Machines, including "scanning" probes, optical comparators,...

  16. Quality control of static irradiation processing products

    International Nuclear Information System (INIS)

    Bao Jianzhong; Chen Xiulan; Cao Hong; Zhai Jianqing

    2002-01-01

    Based on the irradiation processing practice of the nuclear technique application laboratory of Yangzhou Institute of Agricultural Science, the quality control of irradiation processing products is discussed

  17. Establishment for quality control of experimental animal

    International Nuclear Information System (INIS)

    Kim, Tae Hwan; Kim, Soo Kwan; Kim, Tae Kyoung

    1999-06-01

    Until now, because we have imported experimental animal from foreign experimental animal corporation, we could have saved money by establishing the quality control of animal in barrier system. In order to improve the quality of animal experiment and efficiency of biomedical study, it is indispensable to control many factors that effect in the experiment. Therefore, it is essential to organize the system of laboratory animal care for enhancing reliability and revivability of experimental results. The purpose of the present investigation was to establish the quality control system of experimental animals that we can provide good quality animals according to the experimental condition of each investigator although the exact quality control system to estimate the infection of bacteria and virus easily remains ill-defined yet. Accordingly, we established the useful quality control system for microbiologic monitoring and environmental monitoring to protect experimental animal from harmful bacteria and virus

  18. Establishment for quality control of experimental animal

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Tae Hwan; Kim, Soo Kwan; Kim, Tae Kyoung

    1999-06-01

    Until now, because we have imported experimental animal from foreign experimental animal corporation, we could have saved money by establishing the quality control of animal in barrier system. In order to improve the quality of animal experiment and efficiency of biomedical study, it is indispensable to control many factors that effect in the experiment. Therefore, it is essential to organize the system of laboratory animal care for enhancing reliability and revivability of experimental results. The purpose of the present investigation was to establish the quality control system of experimental animals that we can provide good quality animals according to the experimental condition of each investigator although the exact quality control system to estimate the infection of bacteria and virus easily remains ill-defined yet. Accordingly, we established the useful quality control system for microbiologic monitoring and environmental monitoring to protect experimental animal from harmful bacteria and virus.

  19. The study on quality control of bedside CR examination

    International Nuclear Information System (INIS)

    Yang Xufeng; Luo Xiaomei; Xu Qiaolan; Wu Tengfang; Wen Xingwei

    2007-01-01

    Objective: To study the quality controll of bedside CR examination and improves the imaging quality. Methods: X-ray examination with CR system were performed on 3,300 patients. All CR cassettes were encoded. The imaging plate and cassettes were cleaned regularly. Results: With and without quality control, the percentage of first-rate film was 58.2% and 51%, the second-rate film was 40% and 45.5%, the third-rate film was 1.3% and 2%, respectively. Corxespondingly, the ratio of re-examination decreased from 1.5% to 0.5% after quality control, and imaging quality was stable. Conclusion: The quality control of bedside CR examination can improve the image quality as well as lighten the labor of radiographers. (authors)

  20. Microbiological methods for assessing soil quality

    NARCIS (Netherlands)

    Bloem, J.; Hopkins, D.W.; Benedetti, A.

    2006-01-01

    This book provides a selection of microbiological methods that are already applied in regional or national soil quality monitoring programs. It is split into two parts: part one gives an overview of approaches to monitoring, evaluating and managing soil quality. Part two provides a selection of

  1. Quality control of mammographic systems

    International Nuclear Information System (INIS)

    Espana Lopez, M. L.

    2001-01-01

    High quality in mammography is a difficult objective to achieve, that is the reason for what efforts are made in order to improve equipment, to offer good combinations screen-film, and professional staff dedicated to this technique [es

  2. Effect of basic fog of medical x-ray films on image quality and patient dose-method of evaluation and steps to control

    International Nuclear Information System (INIS)

    Bohra, Reena; Nair, C.P.R.; Jayalakshmi, V.; Govindarajan, K.N.; Bhatt, B.C.

    2003-01-01

    Unacceptable basic fog of medical x-ray films has been reported recently from many hospitals. The paper presents the effect of basic fog on radiographic quality of films like sensitivity (speed), contrast and maximum density (DMax). Several batches of general- purpose medical x-ray films from five different manufacturers were studied to evaluate batch-to-batch variation in basic fog. Increase in basic fog with aging of films was also evaluated. Reasons for increased basic fog observed in the film processing facilities of a few hospitals were analysed. Factors responsible for increase in basic fog and the steps to control it have been discussed

  3. Employee quality, monitoring environment and internal control

    Directory of Open Access Journals (Sweden)

    Chunli Liu

    2017-03-01

    Full Text Available We investigate the effect of internal control employees (ICEs on internal control quality. Using special survey data from Chinese listed firms, we find that ICE quality has a significant positive influence on internal control quality. We examine the effect of monitoring on this result and find that the effect is more pronounced for firms with strict monitoring environments, especially when the firms implement the Chinese internal control regulation system (CSOX, have higher institutional ownership or attach greater importance to internal control. Our findings suggest that ICEs play an important role in the design and implementation of internal control systems. Our study should be of interest to both top managers who wish to improve corporate internal control quality and regulators who wish to understand the mechanisms of internal control monitoring.

  4. Quality control education in the community college

    Science.gov (United States)

    Greene, J. Griffen; Wilson, Steve

    1966-01-01

    This paper describes the Quality Control Program at Daytona Beach Junior College, including course descriptions. The program in quality control required communication between the college and the American Society for Quality Control (ASQC). The college has machinery established for certification of the learning process, and the society has the source of teachers who are competent in the technical field and who are the employers of the educational products. The associate degree for quality control does not have a fixed program, which can serve all needs, any more than all engineering degrees have identical programs. The main ideas which would be common to all quality control programs are the concept of economic control of a repetitive process and the concept of developing individual potentialities into individuals who are needed and productive.

  5. Quality control 201TlCl solution obtained at IPEN-CNEN/SP through the direct method of 201Tl preparation

    International Nuclear Information System (INIS)

    Fernandes, L.; Silva, C.P.G. da.

    1991-09-01

    The radiopharmaceutical 201 TlCl is used in Nuclear medicine for myocardial visualization. The solution of 201 TlCl was prepared using 201 Tl obtained by irradiating a natural mercury target with protons. This radionuclide was subjected to different quality control processes to verify the purity required for its use in Medicine. Some of these controls concerned the determination of 200 Tl, 201 Tl and 202 Tl; the chemical identification of 201 Tl +1 ; the hydrazine concentration, mercury contamination and the presence of phosphate. Furthermore, the biologic distribution in Wistar rats and tests for sterility, pyrogens and for toxicity were carried out. It was verified that the solution obtained was in the form of thallous chloride. This radiopharmaceutical can give a good heart image in animals but due to the contamination of 201 Tl with 200 Tl and 202 Tl its use in human beings is not possible unless enriched 202 Hg is used as target of irradiation. (author)

  6. Quality control protocols for radiodiagnosis agents and radiopharmaceuticals

    International Nuclear Information System (INIS)

    Robles, A.; Condor, M.; Caballero, J.; Morote, M.; Garcia, C.; Benites, M.

    1997-01-01

    Based on the compilation of pharmacopoeia methods, literature, manuals and other information developed in our laboratory, protocols have been prepared to carry out quality controls for radiodiagnosis agents (RDA), better known as kits and RDA labelled with Tc99m. Quality control protocols cover physicochemical and biological controls. Physicochemical controls described for RDA include physical characteristics, particle size and number, pH, chemical identification, humidity, tin II; whereas biological controls include sterility, acute toxicity and bacterial endotoxin determination (LAL). Physicochemical controls described for radiopharmaceuticals labelled with Tc99m are pH and radiochemical purity; while biological distribution is described as a biological control

  7. Related regulation of quality control of industrial products

    International Nuclear Information System (INIS)

    1983-04-01

    This book introduce related regulation of quality control of industrial products, which includes regulations of industrial products quality control, enforcement ordinance of industrial products quality control, enforcement regulation of quality control of industrial products, designated items with industrial production quality indication, industrial production quality test, and industrial production quality test organization and management tips of factory quality by grade.

  8. Quality control of plane and tomographic gamma cameras

    International Nuclear Information System (INIS)

    Moretti, J.L.; Roussi, A.

    1993-01-01

    In this article, the authors present different methods of gamma camera quality control in matters of uniformity, spatial resolution, spatial linearity, sensitivity, energy resolution, counting rate performance, SPECT parameters. The authors refer mainly to NEMA standards. 14 figs., 8 tabs

  9. Quality control of nuclear medicine instrumentation

    International Nuclear Information System (INIS)

    Mould, R.F.

    1983-09-01

    The proceedings of a conference held by the Hospital Physicists' Association in London 1983 on the quality control of nuclear medicine instrumentation are presented. Section I deals with the performance of the Anger gamma camera including assessment during manufacture, acceptance testing, routine testing and long-term assessment of results. Section II covers interfaces, computers, the quality control problems of emission tomography and the quality of software. Section III deals with radionuclide measurement and impurity assessment and Section IV the presentation of images and the control of image quality. (U.K.)

  10. Design an Indoor Air Quality Controller Based on LPC2478

    Directory of Open Access Journals (Sweden)

    Shi Shuheng

    2014-07-01

    Full Text Available Indoor air quality is very important to our lives, because we spend most of our time indoor. In order to improve the air quality of indoor, this paper designs an indoor environment quality monitoring and controlling system based on ARM microcontroller LPC2478. It will do a real-time monitoring work for detecting the indoor environmental factors and comprehensively evaluate its air quality level. While the indoor air quality status is "poor", this intelligent system will automatically start the heat exchange ventilator for indoor environmental quality improvement. The results compared to traditional natural ventilation method show the better performance of proposed system.

  11. The statistical process control methods - SPC

    Directory of Open Access Journals (Sweden)

    Floreková Ľubica

    1998-03-01

    Full Text Available Methods of statistical evaluation of quality – SPC (item 20 of the documentation system of quality control of ISO norm, series 900 of various processes, products and services belong amongst basic qualitative methods that enable us to analyse and compare data pertaining to various quantitative parameters. Also they enable, based on the latter, to propose suitable interventions with the aim of improving these processes, products and services. Theoretical basis and applicatibily of the principles of the: - diagnostics of a cause and effects, - Paret analysis and Lorentz curve, - number distribution and frequency curves of random variable distribution, - Shewhart regulation charts, are presented in the contribution.

  12. Fuel manufacture and quality control

    International Nuclear Information System (INIS)

    Roepenack, H.; Raab, K.

    1975-01-01

    The different steps in fuel and fuel element manufacturing from the conversion of UF 6 to UO 2 to the assembling of the whole fuel element are shortly described. Each of this fabrication steps must satisfy well-defined quality criteria which are checked in certain analyses or tests. (RB) [de

  13. USE OF INTELLECTUAL TECHNOLOGIES FOR QUALITY CONTROL OF CURD

    Directory of Open Access Journals (Sweden)

    M. M. Blagoveshchenskaya

    2015-01-01

    Full Text Available In this article, we consider additional method of quality control of curds by organoleptic properties. Method consists in construction of neural network model to estimate quality of curds by input and output parameters. Quality control of curds by organoleptic properties is not necessary according to state standard specification, therefore we use exemplary 5-score scale for organoleptic estimation. Author gives an example of fundamental operation which is necessary for neural networks projection and gives recommendation for integrated hardware/software solution design. This method makes easier quality control of final product because operator can react on digression in the technological process in proper time (use data recommended by neural network, predict quality of final product in case when technological parameters deviate from the norm.

  14. Management Model for efficient quality control in new buildings

    Directory of Open Access Journals (Sweden)

    C. E. Rodríguez-Jiménez

    2017-09-01

    Full Text Available The management of the quality control of each building process is usually set up in Spain from different levels of demand. This work tries to obtain a model of reference, to compare the quality control of the building process of a specific product (building, and to be able to evaluate its warranty level. In the quest of this purpose, we take credit of specialized sources and 153 real cases of Quality Control were carefully revised using a multi-judgment method. Applying different techniques to get a specific valuation (impartial of the input parameters through Delphi’s method (17 experts query, whose matrix treatment with the Fuzzy-QFD tool condenses numerical references through a weighted distribution of the selected functions and their corresponding conditioning factors. The model thus obtained (M153 is useful in order to have a quality control reference to meet the expectations of the quality.

  15. Statistical Process Control: Going to the Limit for Quality.

    Science.gov (United States)

    Training, 1987

    1987-01-01

    Defines the concept of statistical process control, a quality control method used especially in manufacturing. Generally, concept users set specific standard levels that must be met. Makes the point that although employees work directly with the method, management is responsible for its success within the plant. (CH)

  16. Quality control in the radioactive waste management

    International Nuclear Information System (INIS)

    Rzyski, B.M.

    1989-01-01

    Radioactive waste management as in industrial activities must mantain in all steps a quality control programme. This control extended from materials acquisition, for waste treatment, to the package deposition is one of the most important activities because it aims to observe the waste acceptance criteria in repositories and allows to guarantee the security of the nuclear facilities. In this work basic knowledges about quality control in waste management and some examples of adopted procedures in other countries are given. (author) [pt

  17. Effect of quality control implementation on image quality of radiographic films and irradiation doses to patients

    International Nuclear Information System (INIS)

    Cheng Yuxi; Zhou Qipu; Ge Lijuan; Hou Changsong; Qi Xuesong; Yue Baorong; Wang Zuoling; Wei Kedao

    1999-01-01

    Objective: To study the changes in the image quality of radiographic films and the irradiation doses to patients after quality control (QC) implementation. Methods: The entrance surface doses (ESD) to patients measured with TLD and the image quality of radiographic films were evaluated on the basis of CEC image quality criteria. Results: The ESD to patients were significantly reduced after QC implementation (P 0.05), but the post-QC image quality was significantly improved in chest PA, lumbar spine AP and pelvis AP(P0.01 or P<0.05). Conclusion: Significantly reduced irradiation dose with improved image quality can be obtained by QC implementation

  18. Daily peer review of abnormal cervical smears in the assessment of individual practice as an additional method of internal quality control.

    Science.gov (United States)

    Confortini, M; Di Stefano, C; Biggeri, A; Bulgaresi, P; Di Claudio, G; Grisotto, L; Maddau, C; Matucci, M; Petreschi, C; Troni, G M; Turco, P; Foxi, P

    2016-02-01

    An important internal quality control system used in the Cancer Prevention and Research Institute cytopathology laboratory in Florence is the peer review procedure, based on the review of all abnormal cytological smears which routinely emerge. Peer review is an important training opportunity for all cytologists, especially for those with less experience. This article shows the results of the peer review procedure. Of the 63 754 Papanicolaou (Pap) smears screened in 2011, 1086 were considered to be abnormal [at least atypical squamous cells of undetermined significance (ASC-US+)] on primary screening (selected by a single cytologist) and were subjected to the peer review procedure. The overall performance of the laboratory's cytologists was evaluated using a multiple rater analysis and the comparison of each cytologist with the final diagnosis. Further, the agreement was assessed by means of Cohen's kappa and weighted kappa statistics. In general, a moderate/substantial level of agreement between the ten cytologists and the final diagnoses was evident. Kappa values for each reader compared with the final diagnosis ranged from 0.54 to 0.69. The overall kappa value was 0.62 [95% confidence interval (CI), 0.58-0.66] and overall weighted kappa value was 0.76 (95% CI, 0.74-0.79). The category-specific agreement showed the lowest values for atypical squamous cells, cannot exclude high-grade squamous intraepithelial lesion (ASC-H). In summary, peer review represents an important internal quality control in the evaluation and improvement of inter-observer agreement and of the functioning of the laboratory as a whole. Multi-head microscope sessions may improve particularly the reproducibility of borderline diagnoses and, above all, can be an important training contribution for cytologists. © 2014 John Wiley & Sons Ltd.

  19. Desarrollo y validación de los métodos analíticos para el control de calidad del micocilén polvo Development and validation of analytical methods for quality control of Micocilen powder

    Directory of Open Access Journals (Sweden)

    Yania Suárez Pérez

    2011-06-01

    Full Text Available El micocilén es un medicamento que se presenta en forma de polvo. Contiene 2 ingredientes farmacéuticos activos: el ácido undecilénico y el undecilinato de zinc. Por su acción fungistática, se ha convertido en un producto de alta demanda en Cuba, ya que las micosis se favorecen en climas cálidos y húmedos. Se realizó el desarrollo y la validación de 2 métodos analíticos para el control de calidad sobre la base de la cuantificación de cada analito presente en la formulación. Se seleccionaron técnicas volumétricas por neutralización acuosa y complejometría. Los resultados fueron satisfactorios, ya que en ambos casos se obtuvo adecuada especificidad, linealidad, exactitud, precisión y robustez. Los métodos propuestos se compararon con los aplicados anteriormente y se obtuvieron resultados mucho más confiables, según resultados del análisis estadístico aplicado, sin diferencias significativas entre las réplicas de un mismo lote.The undecylenic acid (Micocilen is a drug in powder presentation containing two active pharmaceutical ingredients: undecylenic acid and zinc undecylenate. By its fungistatic action becames a first line product in Cuba because of mycoses are typical of wet and warm climates. Development and validation of two analytical methods for the quality control on the base of the quantification of each symbol present in the formula. Volumetric techniques were selected by aqueous neutralization and complexometric. Results were satisfactory since in both cases an appropriate specificity, linearity, accuracy, precision and robustness were obtained. Methods proposed were compared to those previously applied obtaining more reliable results, according to results of analytical analysis applied, without significant differences among replica of a same batch.

  20. Sensometrics for Food Quality Control

    DEFF Research Database (Denmark)

    Brockhoff, Per B.

    2011-01-01

    The industrial development of innovative and succesful food items and the measuring of food quality in general is difficult without actually letting human beings evaluate the products using their senses at some point in the process. The use of humans as measurement instruments calls for special...... attention in the modelling and data analysis phase. In this paper the focus is on sensometrics – the „metric“ side of the sensory science field. The sensometrics field is introduced and related to the fields of statistics, chemometrics and psychometrics. Some of the most commonly used sensory testing...

  1. Quality control of fireproof coatings for reinforced concrete structures

    Science.gov (United States)

    Gravit, Marina; Dmitriev, Ivan; Ishkov, Alexander

    2017-10-01

    The article analyzes methods of quality inspection of fireproof coatings (work flow, measuring, laboratory, etc.). In modern construction there is a problem of lack of distinct monitoring for the fire protection testing. There is a description of this testing for reinforced concrete structures. The article shows the results of calculation quality control of hatches as an example of fireproof coating for reinforced concrete structures.

  2. Housing tenancy,data management and quality control

    NARCIS (Netherlands)

    Smeets, J.J.A.M.; Timmermans, H.J.P.

    1993-01-01

    This paper deal s with housing tenancy, data management and quality control. The proposed method is focused on quality characteristics of housing estates in view of rentability risks. It entails a cycle of registration, analysis and implementation of measures. The starting point is the behaviour of

  3. Quality control of radioiodinated gastrin for radioimmunoassay

    International Nuclear Information System (INIS)

    Ginabreda, M.G.P.; Borghi, V.C.; Bettarello, A.

    1988-07-01

    Radioiodinated human gastrin has been prepared at IPEN laboratory for radioimmunoassay use. This work developed the quality control of this tracer analyzing parameters of the labelling reaction, chromatographic purification and radioimmunoassay. The radioiodination yield obtained in five experiments was reproducible and similar when analyzed on 7% polyaraylamide gel eletrophoresis - PAGE - (mean + - SD of 51.70 + - 10.76%) and by1 25 I incorporation checked through thrichloroacetic acid precipitation - TCA - (57-36 + - 9.69%). Similary, after purification the labelled gastrin revaled high and reproducible purity degree when submitted to PAGE (96.57 + - 1.06%) and CA (94.82 + - 4.20%) analysis. The respective specific activities varied from 62 to 307 uCi/ug, being determined by the self-displacement method, which is based on the immunoactivity of the tracer. In this way, the antibody titers required to bind 50% of the tracer ranged from 1:32.000 to 1:180.000. Consequently, the respective doses producing 50% fall in the maximum response of the radioimmunoassays ranged from 155.0 to 24.0 pmol/1, but remained unchanged for each tracer even after three months of its preparations. The tracers presented very low non-specific binding values (1.78 + - 0.79%), stablespecific binding values (46.49 + - 5.65%) and a good between-assay precision, evaluated by an internal quality control sample (25.71 + - 4.30%) with coefficient of variation of 16.74%). The PAGE analysis of the unlabeled gastrin used in the first and last radioiodination revealed an unique and unaltered component, confirming the quality of the tracers. (author) [pt

  4. CONCRETE STRUCTURES' QUALITY CONTROL IN PRACTICE

    OpenAIRE

    Dolaček-Alduk, Zlata; Blanda, Miroslav

    2011-01-01

    The Croatian civil engineering is characterized by a lack of systematic approach to planning, control and quality assurance in all phases of project realization. The results obtained in establishing the quality management system in some segments of civil engineering production represent initial trends in solving this problem. Benefits are of two types: the achievement of quality for the contractor and obtaining that quaity is being achieved for clients. Execution of concrete structures is a c...

  5. [Seed quality test methods of Paeonia suffruticosa].

    Science.gov (United States)

    Cao, Ya-Yue; Zhu, Zai-Biao; Guo, Qiao-Sheng; Liu, Li; Wang, Chang-Lin

    2014-11-01

    In order to optimize the testing methods for Paeonia suffruticosa seed quality, and provide basis for establishing seed testing rules and seed quality standard of P. suffruticosa. The seed quality of P. suffruticosa from different producing areas was measured based on the related seed testing regulations. The seed testing methods for quality items of P. suffruticosa was established preliminarily. The samples weight of P. suffruticosa was at least 7 000 g for purity analysis and was at least 700 g for test. The phenotypic observation and size measurement were used for authenticity testing. The 1 000-seed weight was determined by 100-seed method, and the water content was carried out by low temperature drying method (10 hours). After soaking in distilled water for 24 h, the seeds was treated with different temperature stratifications of day and night (25 degrees C/20 degrees C, day/night) in the dark for 60 d. After soaking in the liquor of GA3 300 mg x L(-1) for 24 h, the P. suffruticos seeds were cultured in wet sand at 15 degrees C for 12-60 days for germination testing. Seed viability was tested by TlC method.

  6. A quality control manual for oral radiology

    International Nuclear Information System (INIS)

    Peixoto, J.E.; Ferreira, R.S.; Bessa, S.O.; Domingues, C.; Gomes, C.A.; Oliveira, S.L.G.; Ortiz, J.A.P.

    1988-01-01

    A quality control manual for oral radiology is showed. The X-ray equipment used for this activity is described, such as the X-ray tube, collimator. The high tension in X-ray tube, the spectra, the quality and the quantity of radiation and the X-ray intensity are also analysed. (C.G.C.) [pt

  7. Quality control of gamma radiation measuring systems

    International Nuclear Information System (INIS)

    Surma, M.J.

    2002-01-01

    The problem of quality control and assurance of gamma radiation measuring systems has been described in detail. The factors deciding of high quality of radiometric measurements as well as statistical testing and calibration of measuring systems have been presented and discussed

  8. Net analyte signal based statistical quality control

    NARCIS (Netherlands)

    Skibsted, E.T.S.; Boelens, H.F.M.; Westerhuis, J.A.; Smilde, A.K.; Broad, N.W.; Rees, D.R.; Witte, D.T.

    2005-01-01

    Net analyte signal statistical quality control (NAS-SQC) is a new methodology to perform multivariate product quality monitoring based on the net analyte signal approach. The main advantage of NAS-SQC is that the systematic variation in the product due to the analyte (or property) of interest is

  9. The regulatory maze of quality control

    International Nuclear Information System (INIS)

    Stone, T.I.

    1987-01-01

    The appropriateness of specific procedures within a quality control program becomes difficult to assess when an attempt is made to collate all of the available information. This task is discussed from the perspective of the Joint Commission (JCAH Accreditation Manual), HHS(quality assurance program recommendations), equipment manufacturers maintenance schedules, and radiology administrative cost concerns

  10. With 8D method to excellent quality

    Directory of Open Access Journals (Sweden)

    Marjanca Krajnc

    2012-10-01

    Full Text Available RQ: The research aims to establish the suitability of the 8D methodology for complaint settlement, and to identify any resulting improvement in quality.Purpose: Studies that have research the 8D method are scarce in international literature. Consequently, we decided to assess, based on theoretical premises, the suitability of the 8D method used by an organization, and the efficiency of quality performance directly associated with the 8D method. We will establish whether the use ofthe 8D method results in quality improvement.Method: The research will be carried out using qualitative analysis in the form of a case study of the 8D method used in an organization. I will discuss, based on real and relevant data, the approaches implemented by individual 8D method steps, indicating the integrated supplemental tools. In the quantitative part, I will identify the defective product trends (PPM and the trends of costs related to defective products.Results: The 8D method used for complaint settlement contributes to improved quality and company performance.Organization: The results can be used by the management in continuous improvement as additional motivation for more consistent and effective use, and for additional support to problem-solving coordinators and teams.Society: The findings can also be applied by society at large, mostly companies and public services.Originality: Research on this topic or combination has not yet been conductedLimitations: The sample studied is small, limited to one large company. It includes only the data obtained through the use of the 8D method.

  11. Metallographic quality control of welding and brazing

    International Nuclear Information System (INIS)

    Slaughter, G.M.

    1979-01-01

    The value of metallography in assuring integrity in the fabrication of metal and components in energy systems is summarized. Metallography also plays an integral role in quality control of welded and brazed joints

  12. Quality Controlled Local Climatological Data (QCLCD) Publication

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Quality Controlled Local Climatological Data (QCLCD) contains summaries from major airport weather stations that include a daily account of temperature extremes,...

  13. Quality control during construction of power plants

    International Nuclear Information System (INIS)

    Hartstern, R.F.

    1982-01-01

    This paper traces the background and examines the necessity for a program to control quality during the construction phase of a power plant. It also attempts to point out considerations for making these programs cost effective

  14. Computer-supported quality control in X-ray diagnosis

    International Nuclear Information System (INIS)

    Maier, W.; Klotz, E.

    1989-01-01

    Quality control of X-ray facilities in radiological departments of large hospitals is possible only if the instrumentation used for measurements is interfaced to a computer. The central computer helps to organize the measurements as well as analyse and record the results. It can also be connected to a densitometer and camera for evaluating radiographs of test devices. Other quality control tests are supported by a mobile station with equipment for non-invasive dosimetry measurements. Experience with a computer-supported system in quality control of film and film processing is described and the evaluation methods of ANSI and the German industrial standard DIN are compared. The disadvantage of these methods is the exclusion of film quality parameters, which can make processing control almost worthless. (author)

  15. Analytical techniques and quality control in biomedical trace element research

    DEFF Research Database (Denmark)

    Heydorn, K.

    1994-01-01

    The small number of analytical results in trace element research calls for special methods of quality control. It is shown that when the analytical methods are in statistical control, only small numbers of duplicate or replicate results are needed to ascertain the absence of systematic errors....../kg. Measurement compatibility is obtained by control of traceability to certified reference materials, (C) 1994 Wiley-Liss, Inc....

  16. ICT diagnostic method of beryllium welding quality

    International Nuclear Information System (INIS)

    Sun Lingxia; Wei Kentang; Ye Yunchang

    2002-01-01

    To avoid the interference of high density material for the quality assay of beryllium welding line, a slice by slice scanning method was proposed based upon the research results of the Industrial Computerized Tomography (ICT) diagnostics for weld penetration, weld width, off-centered deviation and weld defects of beryllium-ring welding seam with high density material inside

  17. Quality Control of Trichinella Testing at the Slaughterhouse Laboratory: Evaluation of the Use of a 400-Micrometer-Mesh-Size Sieve in the Magnetic Stirrer Method.

    Science.gov (United States)

    Franssen, Frits; van Andel, Esther; Swart, Arno; van der Giessen, Joke

    2016-02-01

    The performance of a 400-μm-mesh-size sieve (sieve400) has not previously been compared with that of a 180-μm-mesh-size sieve (sieve180). Using pork samples spiked with 0 to 10 Trichinella muscle larvae and an artificial digestion method, sieve performance was evaluated for control of Trichinella in meat-producing animals. The use of a sieve400 resulted in 12% lower larval counts, 147% more debris, and 28% longer counting times compared with the use of a sieve180. Although no false-negative results were obtained, prolonged counting times with the sieve400 may have an impact on performance in a high-throughput environment such as a slaughterhouse laboratory. Based on our results, the sieve180 remains the sieve of choice for Trichinella control in meat in slaughterhouse laboratories, according to the European Union reference method (European Commission regulation 2075/2005). Furthermore, the results of the present study contribute to the discussion of harmonization of meat inspection requirements among countries.

  18. Quality control of injection moulded micro mechanical parts

    DEFF Research Database (Denmark)

    Gasparin, Stefania; Tosello, Guido; Hansen, Hans Nørgaard

    2009-01-01

    Quality control of micro components is an increasing challenge. Smaller mechanical parts are characterized by smaller tolerance to be verified. This paper focuses on the dimensional verification of micro injection moulded components selected from an industrial application. These parts are measured...... using an Optical Coordinate Measuring Machine (OCMM), which guarantees fast surface scans suitable for in line quality control. The uncertainty assessment of the measurements is calculated following the substitution method. To investigate the influence parameters in optical coordinate metrology two...

  19. COLLABORATIVE TRIAL AND QUALITY CONTROL IN CHEMICAL ANALYSIS

    Directory of Open Access Journals (Sweden)

    Narsito Narsito

    2010-06-01

    Full Text Available Abstract                                                             This paper deals with some practical problems related to the quality of analytical chemical data usually met in practice. Special attention is given to the topic of quality control in analytical chemistry, since analytical data is one of the primary information from which some important scientifically based decision are to be made. The present paper starts with brief description on some fundamental aspects associated with quality of analytical data, such as sources of variation of analytical data, criteria for quality of analytical method, quality assurance in chemical analysis. The assessment of quality parameter for analytical method like the use of standard materials as well as standard methods is given. Concerning with the quality control of analytical data, the use of several techniques, such as control samples and control charts, in monitoring analytical data in quality control program are described qualitatively.  In the final part of this paper, some important remarks for the preparation of collaborative trials, including the evaluation of accuracy and reproducibility of analytical method are also given Keywords: collaborative trials, quality control, analytical data Abstract                                                             This paper deals with some practical problems related to the quality of analytical chemical data usually met in practice. Special attention is given to the topic of quality control in analytical chemistry, since analytical data is one of the primary information from which some important scientifically based decision are to be made. The present paper starts with brief description on some fundamental aspects associated with quality of analytical data, such as sources of variation of analytical data, criteria for quality of

  20. New approach to equipment quality evaluation method with distinct functions

    Directory of Open Access Journals (Sweden)

    Milisavljević Vladimir M.

    2016-01-01

    Full Text Available The paper presents new approach for improving method for quality evaluation and selection of equipment (devices and machinery by applying distinct functions. Quality evaluation and selection of devices and machinery is a multi-criteria problem which involves the consideration of numerous parameters of various origins. Original selection method with distinct functions is based on technical parameters with arbitrary evaluation of each parameter importance (weighting. Improvement of this method, presented in this paper, addresses the issue of weighting of parameters by using Delphi Method. Finally, two case studies are provided, which included quality evaluation of standard boilers for heating and evaluation of load-haul-dump (LHD machines, to demonstrate applicability of this approach. Analytical Hierarchical Process (AHP is used as a control method.

  1. Informatization of items quality control for NI in nuclear power plant

    International Nuclear Information System (INIS)

    Zhang Jiankui; Zang Baiqi

    2010-01-01

    Design ideas, implementation methods and some key techniques for item quality control of NI in nuclear power plant are illustrated in this article according to item quality management mode. The item quality control method can improve the quality of NI, ensure the safety and lower the construction and operation cost of nuclear power plant. (authors)

  2. Quality assurance and quality control in mammography: A review

    International Nuclear Information System (INIS)

    BenComo, Jose A.

    2000-01-01

    A mammogram is among the most technically demanding radiographic procedures. The early detection of breast cancer relies on the radiologist's ability to perceive subtle changes in the image that are only perceptible with high-quality imaging. Early detection of breast cancer is only as reliable as the mammogram with which a diagnosis is made, and a mammogram is only as accurate as the system that produces it. A quality assurance (QA) program maximizes the likelihood that the mammographic images will provide adequate diagnostic information for the least possible radiation exposure and cost to the patient. The QA program monitors each phase of operation of the imaging facility beginning with the request for an examination and ending with the interpretation of the referring physician and ensures that the imaging equipment used for the examination will yield the information desired. Because image quality is the most important technical aspect of mammography, this review summarizes the most important QA and quality control issues

  3. Quality control and analysis of radiotracer compounds

    International Nuclear Information System (INIS)

    Sheppard, G.; Thomson, R.

    1977-01-01

    Special emphasis was on the problems and errors possible in quality control and analysis. The principles underlying quality control were outlined, and analytical techniques applicable to radiotracers were described. Chapter concluded with a selection of examples showing the effects of impurities on the use of radiotracers. The subject of quality control and analysis was treated from the viewpoint of the user and those research workers who need to synthesize and analyze their own radiochemicals. The quality characteristics for radiotracers are of two kinds, valuable or attributive. These were discussed in the chapter. For counting low radioactive concentration, scintillation techniques are in general use, whereas ionization techniques are now used mainly for the measurement of high radioactive concentrations or large quantities of radioactivity, for scanning chromatograms, and a number of very specific purposes. Determination of radionuclidic purity was discussed. Use of radiotracers in pharmaceuticals were presented. 4 figures, 6 tables

  4. Network-based production quality control

    Science.gov (United States)

    Kwon, Yongjin; Tseng, Bill; Chiou, Richard

    2007-09-01

    This study investigates the feasibility of remote quality control using a host of advanced automation equipment with Internet accessibility. Recent emphasis on product quality and reduction of waste stems from the dynamic, globalized and customer-driven market, which brings opportunities and threats to companies, depending on the response speed and production strategies. The current trends in industry also include a wide spread of distributed manufacturing systems, where design, production, and management facilities are geographically dispersed. This situation mandates not only the accessibility to remotely located production equipment for monitoring and control, but efficient means of responding to changing environment to counter process variations and diverse customer demands. To compete under such an environment, companies are striving to achieve 100%, sensor-based, automated inspection for zero-defect manufacturing. In this study, the Internet-based quality control scheme is referred to as "E-Quality for Manufacturing" or "EQM" for short. By its definition, EQM refers to a holistic approach to design and to embed efficient quality control functions in the context of network integrated manufacturing systems. Such system let designers located far away from the production facility to monitor, control and adjust the quality inspection processes as production design evolves.

  5. 20. Quality assurance and quality control in nuclear medicine

    International Nuclear Information System (INIS)

    Vavrejn, B.

    1989-01-01

    Quality control principles to be applied when taking over and using nuclear medicine instrumentation are given. Such instrumentation includes activity meters, gamma detectors for in vitro measurements (manual or automated instruments), gamma detectors for in vivo measurements (with one or several probes), 'movable' scintigraphs and 'steady' scintigraphs (gamma cameras). (Z.S.)

  6. Métodos de controle de plantas daninhas e seus impactos na qualidade microbiana de solo sob cafeeiro Methods of weed control and their impacts on microbial quality of soil under coffee

    Directory of Open Access Journals (Sweden)

    Rogério Melloni

    2013-02-01

    empregado para o controle de plantas daninhas em cafeeiro.Minas Gerais stands out as the largest coffee-producing state of Brazil. This crop is extremely susceptible to weeds, which can be handled by manual, mechanized and/or chemical methods, which strongly affect production costs and soil quality. In this sense, the objective of this study was to evaluate the effect of different weed control methods in and between coffee rows on the soil microbiota and its processes. For this purpose, soil samples were taken in April 2010 from an Oxisol on the experimental farm of the Agricultural Research Company of Minas Gerais (EPAMIG, in São Sebastião do Paraíso, MG, at a depth of 0-10 cm in the middle of the track (interrow of coffee and 20 cm away from the stem of the coffee trees (row, to determine the following properties: total density of bacteria and fungi, phosphate solubilizers, cellulolytic and ammonifying microorganisms, non-symbiotic diazotrophic bacteria, carbon biomass and microbial activity, metabolic quotient (qCO2 and enzymatic activity by the hydrolysis of fluorescein diacetate. The coffee plants were subjected to seven methods of weed control: mowing, coffee tandem disk harrow (grid, rotary tiller, post-emergence herbicide, pre-emergence herbicide, manual weeding, and no weed control. The results showed the complexity of the effects of these different methods on soil and its processes, with lowest impacts of manual weeding and rotary hoe. Mowing, coffee tandem disk harrow, no weed control and pre-emergence herbicide caused intermediate impacts, while the application of post-emergence herbicides in-between coffee rows caused the most negative impacts on the evaluated properties. It is suggested that these impacts must be considered when evaluating and selecting the method for weed control in coffee plants.

  7. Quality control in radiography: a primary responsibility of the technologist

    International Nuclear Information System (INIS)

    Koenig, G.F.

    1973-01-01

    The relationship between quality control in radiography and radiation protection is emphasized. Methods of dose reduction discussed are the 0.1 mm fractional focal spot, the use of high speed intensifying screens, and automatic exposure control. The need for recommendations for the establishment of improved systems of radiography is discussed. The development of revised educational concepts for radiologists is considered. (U.S.)

  8. Quality control for 12 batch of DTPA-Sn

    International Nuclear Information System (INIS)

    Isaac, M.; Gamboa, R.; Leyva, R.; Hernandez, I.; Turino, D.

    1994-01-01

    The quality control is carry out at 12 batch of DTPA-Sn for labeling with 99 m Tc. The instrumental methods of analysis and control charts were discussed in order to find a warranty time for the product. (author). 2 refs, 3 figs, 1 tab

  9. Methods for the quality control of macroaggregates and colloids labelled with technetium-99m. Part of a coordinated programme on radiopharmaceuticals

    International Nuclear Information System (INIS)

    Cifka, J.

    1975-09-01

    Comprehensive studies of the antimony sulphide and sulphur colloids labelled with sup(99m)Tc was performed by the authors. Similar studies dealing with human serum albumin macroaggregates labelled with sup(99m)Tc were also initiated. The labelling processes were studied to determine the possible chemical forms of technetium-99m not bound to the colloidal particles. It was found that pertechnetate-99m is not the only possible impurity in the case of the colloids. Technetium-99m may be present as an soluble tartrate complex in the case of antimony sulphide colloid or as a soluble chlorocomplex in the case of the sulphur colloid. Techniques for the control of these colloids were developed. A method for the determination of particle size of the sulphur colloid is also described

  10. Quality control in 99m technetium radiopharmaceuticals

    International Nuclear Information System (INIS)

    Leon Cabana, Alba

    1994-01-01

    This work means about the quality control in Tc radiopharmaceuticals preparation at hospitalary levels. Several steps must be used in a Nuclear Medicine Laboratory, such as proceeding,radiopharmaceuticals kits preparation, and dispensation materials,glasses,stopper,physical aspects,identification,ph control,storage,and reactif kits

  11. PACS quality control and automatic problem notifier

    Science.gov (United States)

    Honeyman-Buck, Janice C.; Jones, Douglas; Frost, Meryll M.; Staab, Edward V.

    1997-05-01

    One side effect of installing a clinical PACS Is that users become dependent upon the technology and in some cases it can be very difficult to revert back to a film based system if components fail. The nature of system failures range from slow deterioration of function as seen in the loss of monitor luminance through sudden catastrophic loss of the entire PACS networks. This paper describes the quality control procedures in place at the University of Florida and the automatic notification system that alerts PACS personnel when a failure has happened or is anticipated. The goal is to recover from a failure with a minimum of downtime and no data loss. Routine quality control is practiced on all aspects of PACS, from acquisition, through network routing, through display, and including archiving. Whenever possible, the system components perform self and between platform checks for active processes, file system status, errors in log files, and system uptime. When an error is detected or a exception occurs, an automatic page is sent to a pager with a diagnostic code. Documentation on each code, trouble shooting procedures, and repairs are kept on an intranet server accessible only to people involved in maintaining the PACS. In addition to the automatic paging system for error conditions, acquisition is assured by an automatic fax report sent on a daily basis to all technologists acquiring PACS images to be used as a cross check that all studies are archived prior to being removed from the acquisition systems. Daily quality control is preformed to assure that studies can be moved from each acquisition and contrast adjustment. The results of selected quality control reports will be presented. The intranet documentation server will be described with the automatic pager system. Monitor quality control reports will be described and the cost of quality control will be quantified. As PACS is accepted as a clinical tool, the same standards of quality control must be established

  12. Exposure parameters in fluoroscopy equipment. Quality control

    International Nuclear Information System (INIS)

    Alonso, M.; Castaneda, M.J.; Matorras, P.; Diaz-Caneja, N.; Gutierrez, I.

    1992-01-01

    Within the quality control program in Diagnostic Radiology currently being undertaken at the 'Marques de Valdecilla' University Hospital, the corresponding specification and procedure prototypes for the control of conventional radioscopy equipment have been elaborated and applied. This paper presents the values proposed in the specifications and those obtained for the following radioscopy equipment parameters: reference kerma, and its reproducibility, kerma linearity, maximum kerma at the skin, and total filtration. The results obtained indicate that the equipment studied could comply with specified requirements if a Maintenance Program were to be implemented in coordination with the Quality Control Program. (author)

  13. Analytical quality control [An IAEA service

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1973-07-01

    In analytical chemistry the determination of small or trace amounts of elements or compounds in different types of materials is increasingly important. The results of these findings have a great influence on different fields of science, and on human life. Their reliability, precision and accuracy must, therefore, be checked by analytical quality control measures. The International Atomic Energy Agency (IAEA) set up an Analytical Quality Control Service (AQCS) in 1962 to assist laboratories in Member States in the assessment of their reliability in radionuclide analysis, and in other branches of applied analysis in which radionuclides may be used as analytical implements. For practical reasons, most analytical laboratories are not in a position to check accuracy internally, as frequently resources are available for only one method; standardized sample material, particularly in the case of trace analysis, is not available and can be prepared by the institutes themselves only in exceptional cases; intercomparisons are organized rather seldom and many important types of analysis are so far not covered. AQCS assistance is provided by the shipment to laboratories of standard reference materials containing known quantities of different trace elements or radionuclides, as well as by the organization of analytical intercomparisons in which the participating laboratories are provided with aliquots of homogenized material of unknown composition for analysis. In the latter case the laboratories report their data to the Agency's laboratory, which calculates averages and distributions of results and advises each laboratory of its performance relative to all the others. Throughout the years several dozens of intercomparisons have been organized and many thousands of samples provided. The service offered, as a consequence, has grown enormously. The programme for 1973 and 1974, which is currently being distributed to Member States, will contain 31 different types of materials.

  14. The application of statistical process control in linac quality assurance

    International Nuclear Information System (INIS)

    Li Dingyu; Dai Jianrong

    2009-01-01

    Objective: To improving linac quality assurance (QA) program with statistical process control (SPC) method. Methods: SPC is applied to set the control limit of QA data, draw charts and differentiate the random and systematic errors. A SPC quality assurance software named QA M ANAGER has been developed by VB programming for clinical use. Two clinical cases are analyzed with SPC to study daily output QA of a 6MV photon beam. Results: In the clinical case, the SPC is able to identify the systematic errors. Conclusion: The SPC application may be assistant to detect systematic errors in linac quality assurance thus it alarms the abnormal trend to eliminate the systematic errors and improves quality control. (authors)

  15. Quality control procedure for dental x-ray film processing

    International Nuclear Information System (INIS)

    Tingey, D.R.C.

    1983-08-01

    Methods of obtaining the optimum processing from dental films are discussed. A method of quality control of developing conditions for dental x-ray films has been developed. It is relatively easy to maintain and is sufficiently accurate for practical purposes

  16. Optimal control linear quadratic methods

    CERN Document Server

    Anderson, Brian D O

    2007-01-01

    This augmented edition of a respected text teaches the reader how to use linear quadratic Gaussian methods effectively for the design of control systems. It explores linear optimal control theory from an engineering viewpoint, with step-by-step explanations that show clearly how to make practical use of the material.The three-part treatment begins with the basic theory of the linear regulator/tracker for time-invariant and time-varying systems. The Hamilton-Jacobi equation is introduced using the Principle of Optimality, and the infinite-time problem is considered. The second part outlines the

  17. Method for controlling powertrain pumps

    Science.gov (United States)

    Sime, Karl Andrew; Spohn, Brian L; Demirovic, Besim; Martini, Ryan D; Miller, Jean Marie

    2013-10-22

    A method of controlling a pump supplying a fluid to a transmission includes sensing a requested power and an excess power for a powertrain. The requested power substantially meets the needs of the powertrain, while the excess power is not part of the requested power. The method includes sensing a triggering condition in response to the ability to convert the excess power into heat in the transmission, and determining that an operating temperature of the transmission is below a maximum. The method also includes determining a calibrated baseline and a dissipation command for the pump. The calibrated baseline command is configured to supply the fluid based upon the requested power, and the dissipation command is configured to supply additional fluid and consume the excess power with the pump. The method operates the pump at a combined command, which is equal to the calibrated baseline command plus the dissipation command.

  18. Quality control in diagnostic radiology - patient dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Prlic, I; Radalj, Z; Brumen, V; Cerovac, H [Institute for Medical Research and Occupational Health, Laboratory for Radiation Protection and Dosimetry, Zagreb (Croatia); Gladic, J [Institute for Physics, Laboratory for Solid State Physics, Zagreb (Croatia); Tercek, V [Clinical Hospital Sisters of Mercy, Health Physics Department, Zagreb (Croatia)

    1997-12-31

    In order to establish the Quality Criteria for diagnostic radiographic images in the radiology departments in Republic of Croatia we have started the several Quality Control projects on the field. The measurements are performed according to some methodology recommendations in our law but the methodology, measurement principles, measurement equipment, phantoms, measurable parameters for the good use by radiographers, statistical and numerical evaluation, dosimetric philosophy etc. where first recognized as a private/or group hazard of each person involved in the procedure of evaluation of diagnostic radiology images/diagnosis. The important quality elements of the imaging process are: the diagnostic quality of the radiographic image, the radiation dose to the patient and the choice of the radiographic technique. This depends on the x-ray unit (tube) radiation quality, image processing quality and final image evaluation quality. In this paper we will show how the Quality Control measurements can be easily connected to the dose delivered to the patient for the known diagnostic procedure and how this can be used by radiographers in their daily work. The reproducibility of the x-ray generator was checked before the service calibration and after the service calibration. The table of kV dependence and output dose per mAs was calculated and the ESD (entrance surface dose) was measured/calculated for the specific diagnostic procedure. After the phantom calculation were made and the dose prediction for the given procedure was done, measurements were done on the patients (digital dosemeters, TLD and film dosemeter combinations). We are claiming that there is no need to measure each patient if the proper Quality Control measurements are done and the proper table of ESD for each particular x-ray tube in diagnostic departments is calculated for the radiographers daily use. (author). 1 example, 1 fig., 13 refs.

  19. Current status of quality evaluation of nursing care through director review and reflection from the Nursing Quality Control Centers

    OpenAIRE

    Duan, Xia; Shi, Yan

    2014-01-01

    Background: The quality evaluation of nursing care is a key link in medical quality management. It is important and worth studying for the nursing supervisors to know the disadvantages during the process of quality evaluation of nursing care and then to improve the whole nursing quality. This study was to provide director insight on the current status of quality evaluation of nursing care from Nursing Quality Control Centers (NQCCs). Material and Methods: This qualitative study used a sample ...

  20. Quality control in paediatric nuclear medicine

    International Nuclear Information System (INIS)

    Fischer, S.; Hahn, K.

    1997-01-01

    Nuclear medicine examinations in children require a maximum in quality. This is true for the preparation of the child and parents, the imaging procedure, processing and documentation. It is necessary that quality control through all steps is performed regularly. The aim must be that the children receive a minimum radiation dose, while there needs to be a high quality in imaging and clinical information from the study. Furthermore the child should not be too much psychologically affected by the nuclear medicine examination. (orig.) [de

  1. Quality Assurance and Quality Control in TLD Measurement

    International Nuclear Information System (INIS)

    Bhuiyan, S.I.; Qronfla, M.M.; Abulfaraj, W.H.; Kinsara, A.A.; Taha, T.M.; Molla, N.I.; Elmohr, S.M.

    2008-01-01

    TLD technique characterized by high precision and reproducibility of dose measurement is presented by addressing pre-readout annealing, group sorting, dose evaluation, blind tests, internal dose quality audit and external quality control audits. Two hundred and forty TLD chips were annealed for 1 hour at 4000 degree C followed by 2 h at 1000 degree C. After exposure of 1 mGy from 90 Sr irradiator TLDs were subjected to pre-readout annealing at 1000 degree C, then readout, sorted into groups each with nearly equal sensitivity. Upon repeating the procedures, TLDs having response >3.5% from group mean were dropped to assuring group stability. Effect of pre-readout annealing has been studied. Series of repeated measurements were conducted to stabilize calibration procedures and DCF generation using SSDL level 137 Cs calibrator, dose master, ionization chambers. Performed internal dose quality audits, blind tests and validated by external QC tests with King Abdulaziz City of Science and Technology

  2. Frontiers in statistical quality control 11

    CERN Document Server

    Schmid, Wolfgang

    2015-01-01

    The main focus of this edited volume is on three major areas of statistical quality control: statistical process control (SPC), acceptance sampling and design of experiments. The majority of the papers deal with statistical process control, while acceptance sampling and design of experiments are also treated to a lesser extent. The book is organized into four thematic parts, with Part I addressing statistical process control. Part II is devoted to acceptance sampling. Part III covers the design of experiments, while Part IV discusses related fields. The twenty-three papers in this volume stem from The 11th International Workshop on Intelligent Statistical Quality Control, which was held in Sydney, Australia from August 20 to August 23, 2013. The event was hosted by Professor Ross Sparks, CSIRO Mathematics, Informatics and Statistics, North Ryde, Australia and was jointly organized by Professors S. Knoth, W. Schmid and Ross Sparks. The papers presented here were carefully selected and reviewed by the scientifi...

  3. Quality control procedures in positron tomography

    International Nuclear Information System (INIS)

    Spinks, T.; Jones, T.; Heather, J.; Gilardi, M.

    1989-01-01

    The derivation of physiological parameters in positron tomography relies on accurate calibration of the tomograph. Normally, the calibration relates image pixel count density to the count rate from an external blood counter per unit activity concentration in each device. The quality control of the latter is simple and relies on detector stability assessed by measurement of a standard source of similar geometry to a blood sample. The quality control of the tomographic data depends on (i) detector stability, (ii) uniformity of calibration and normalisation sources and (iii) reproducibility of the attenuation correction procedure. A quality control procedure has been developed for an 8 detector ring (15 transaxial plane) tomograph in which detector response is assessed by acquiring data from retractable transmission ring sources. These are scanned daily and a print out of detector efficiencies is produced as well as changes from a given data. This provides the raw data from which decisions on recalibration or renormalisation are made. (orig.)

  4. Protein quality control in the nucleus

    DEFF Research Database (Denmark)

    Nielsen, Sofie V.; Poulsen, Esben Guldahl; Rebula, Caio A.

    2014-01-01

    to aggregate, cells have evolved several elaborate quality control systems to deal with these potentially toxic proteins. First, various molecular chaperones will seize the misfolded protein and either attempt to refold the protein or target it for degradation via the ubiquitin-proteasome system...... to be particularly active in protein quality control. Thus, specific ubiquitin-protein ligases located in the nucleus, target not only misfolded nuclear proteins, but also various misfolded cytosolic proteins which are transported to the nucleus prior to their degradation. In comparison, much less is known about...... these mechanisms in mammalian cells. Here we highlight recent advances in our understanding of nuclear protein quality control, in particular regarding substrate recognition and proteasomal degradation....

  5. The Study on quality control of nuclear power installation project

    International Nuclear Information System (INIS)

    Wu Jie

    2008-01-01

    The quality planning, quality assurance and quality control are discussed by applying the quality control (QC) theory and combining the real situation of the Qinshan II project. This paper is practical and plays an active role in instruction of project quality control by applying the above QC theory and control techniques. (authors)

  6. A quality control program for radiation sources

    International Nuclear Information System (INIS)

    Almeida, C.E. de; Sibata, C.H.; Cecatti, E.R.; Kawakami, N.S.; Alexandre, A.C.; Chiavegatti Junior, M.

    1982-01-01

    An extensive quality control program was established covering the following areas: physical parameters of the therapeutical machines, dosimetric standards, preventive maintenance of radiation sources and measuring instruments. A critical evaluation of this program was done after two years (1977-1979) of routine application and the results will be presented. The fluctuation on physical parameters strongly supports the efforts and cost of a quality control program. This program has certainly improved the accuracy required on the delivery of the prescribed dose for radiotherapy treatment. (Author) [pt

  7. Quality control of nuclear medicine instruments 1991

    International Nuclear Information System (INIS)

    1991-05-01

    This document gives detailed guidance on the quality control of various instruments used in nuclear medicine. A first preliminary document was drawn up in 1979. A revised and extended version, incorporating recommended procedures, test schedules and protocols was prepared in 1982. The first edition of ''Quality Control of Nuclear Medicine Instruments'', IAEA-TECDOC-317, was printed in late 1984. Recent advances in the field of nuclear medicine imaging made it necessary to add a chapter on Camera-Computer Systems and another on SPECT Systems. Figs and tabs

  8. Quality control of nuclear medicine instruments, 1991

    International Nuclear Information System (INIS)

    1996-12-01

    This document gives detailed guidance on the quality control of various instruments used in nuclear medicine. A first preliminary document was drawn up in 1979. A revised and extended version, incorporating recommended procedures, test schedules and protocols was prepared in 1982. The first edition of 'Quality Control of Nuclear Medicine Instruments', IAEA-TECDOC-317, was printed in late 1984. Recent advances in the field of nuclear medicine imaging made it necessary to add a chapter on Camera-Computer Systems and another on SPECT Systems

  9. HPLC for quality control of polyimides

    Science.gov (United States)

    Young, P. R.; Sykes, G. F.

    1979-01-01

    High Pressure Liquid Chromatography (HPLC) as a quality control tool for polyimide resins and prepregs are presented. A data base to help establish accept/reject criteria for these materials was developed. This work is intended to supplement, not replace, standard quality control tests normally conducted on incoming resins and prepregs. To help achieve these objectives, the HPLC separation of LARC-160 polyimide precursor resin was characterized. Room temperature resin aging effects were studied. Graphite reinforced composites made from fresh and aged resin were fabricated and tested to determine if changes observed by HPLC were significant.

  10. Statistical quality control a loss minimization approach

    CERN Document Server

    Trietsch, Dan

    1999-01-01

    While many books on quality espouse the Taguchi loss function, they do not examine its impact on statistical quality control (SQC). But using the Taguchi loss function sheds new light on questions relating to SQC and calls for some changes. This book covers SQC in a way that conforms with the need to minimize loss. Subjects often not covered elsewhere include: (i) measurements, (ii) determining how many points to sample to obtain reliable control charts (for which purpose a new graphic tool, diffidence charts, is introduced), (iii) the connection between process capability and tolerances, (iv)

  11. Laboratory diagnostic methods, system of quality and validation

    Directory of Open Access Journals (Sweden)

    Ašanin Ružica

    2005-01-01

    Full Text Available It is known that laboratory investigations secure safe and reliable results that provide a final confirmation of the quality of work. Ideas, planning, knowledge, skills, experience, and environment, along with good laboratory practice, quality control and reliability of quality, make the area of biological investigations very complex. In recent years, quality control, including the control of work in the laboratory, is based on international standards and is used at that level. The implementation of widely recognized international standards, such as the International Standard ISO/IEC 17025 (1 and the implementing of the quality system series ISO/IEC 9000 (2 have become the imperative on the grounds of which laboratories have a formal, visible and corresponding system of quality. The diagnostic methods that are used must constantly yield results which identify the animal as positive or negative, and the precise status of the animal is determined with a predefined degree of statistical significance. Methods applied on a selected population reduce the risk of obtaining falsely positive or falsely negative results. A condition for this are well conceived and documented methods, with the application of the corresponding reagents, and work with professional and skilled staff. This process requires also a consistent implementation of the most rigorous experimental plans, epidemiological and statistical data and estimations, with constant monitoring of the validity of the applied methods. Such an approach is necessary in order to cut down the number of misconceptions and accidental mistakes, for a referent population of animals on which the validity of a method is tested. Once a valid method is included in daily routine investigations, it is necessary to apply constant monitoring for the purpose of internal quality control, in order adequately to evaluate its reproducibility and reliability. Consequently, it is necessary at least twice yearly to conduct

  12. Technical quality control - constancy controls for digital mammography systems

    International Nuclear Information System (INIS)

    Pedersen, K.; Landmark, I.D.; Bredholt, K.; Hauge, I.H.R.

    2009-04-01

    To ensure the quality of mammographic images, so-called constancy control tests are performed frequently. The report contains a programme for constancy control of digital mammography systems, encompassing the mammography unit, computed radiography (CR) systems, viewing conditions and displays, printers, and procedures for data collection for patient dose calculations. (Author)

  13. Quality Assurance and Control in Laboratory using Neutron Activation Analysis

    International Nuclear Information System (INIS)

    Chung, Y. S.; Moon, J. H.; Sun, G. M.; Kim, S. H.; Baek, S. Y.; Lim, J. M.; Kim, H. R.

    2007-01-01

    In accordance with the increment of international trade associated with the worldwide globalization, the importance of quality assurance and control for the commodity produced from one's own country has been stressed. ISO (International Organization for Standards) defines quality control as 'the operational techniques and activities that are used to fulfill the requirements for quality'. Since 1996, the HANARO research reactor in the Korea Atomic Energy Research Institute has been operated thereafter initial critical operation on April 1995. Neutron activation analysis system and applied techniques which is one of a nuclear analytical technologies using reactor neutrons has been developed for user's supporting and the establishment of the quality system for a measurement and analysis, testing and inspection was implemented successfully. On the basis of the qualified NAA system, the test and measurement of more than 1500 samples which is requested from 30 organizations including industrial companies, universities and institutes carried out in NAA laboratory annually. Moreover, as the goal of mutual recognition agreement (MRA) which can be removed a technical barrier in international trade, the objectivity and the confidence of analytical quality in NAA laboratory became established through the installation of international accreditation system by implementing analytical quality system in accordance with international standards in 2001. The aim of the report was to summarize the technical management of introduction, methods and the results for a quality control and assurance which should be performed in NAA technique using the HANARO research reactor. The report will help building up effective quality control strategy in the future

  14. A Comparison of Power Quality Controllers

    Directory of Open Access Journals (Sweden)

    Petr Černek

    2012-01-01

    Full Text Available This paper focuses on certain types of FACTS (Flexibile AC Transmission System controllers, which can be used for improving the power quality at the point of connection with the power network. It focuses on types of controllers that are suitable for use in large buildings, rather than in transmission networks. The goal is to compare the features of the controllers in specific tasks, and to clarify which solution is best for a specific purpose. It is in some cases better and cheaper to use a combination of controllers than a single controller. The paper also presents the features of a shunt active harmonic compensator, which is a very modern power quality controller that can be used in many cases, or in combination with other controllers. The comparison was made using a matrix diagram that, resulted from mind mapsand other analysis tools. The paper should help engineers to choose the best solution for improving the power quality in a specific power network at distribution level.

  15. The medical software quality deployment method.

    Science.gov (United States)

    Hallberg, N; Timpka, T; Eriksson, H

    1999-03-01

    The objective of this study was to develop a Quality Function Deployment (QFD) model for design of information systems in health-care environments. Consecutive blocked-subject case studies were conducted, based on action research methods. Starting with a QFD model for software development, a model for information system design, the Medical Software Quality Deployment (MSQD) model, was developed. The MSQD model was divided into the pre-study phase, in which the customer categories and their power to influence the design are determined; the data collection phase, in which the voice of customers (VoC) is identified by observations and interviews and quantified by Critical. Incident questionnaires; the need specification phase, where the VoC is specified into ranked customer needs; and the design phase where the customer needs are transformed stepwise to technical requirements and design attributes. QFD showed to be useful for integrating the values of different customer categories in software development for health-care settings. In the later design phases, other quality methods should be used for software implementation and testing.

  16. Internal quality control of neutron activation analysis laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Kim, S. H.; Mun, J. H.; BaeK, S. Y.; Jung, Y. S.; Kim, Y. J. [KAERI, Taejon (Korea, Republic of)

    2004-07-01

    The importance for quality assurance and control in analytical laboratories has been emphasized, day by day. Internal quality control using certified reference materials(CRMs) can be one of effective methods for this purpose. In this study, 10 kinds of CRMs consisting of soil, sediment and biological matrix were analyzed. To evaluate the confidence of analytical results and the validation of testing method and procedure, the accuracy and the precision of the measured elements were treated statistically and the reproducibility was compared with those values produced before 2003.

  17. Concept and realization of quality control in FRG

    International Nuclear Information System (INIS)

    Odoj, R.; Martens, B.R.; Warnecke, E.

    1987-01-01

    Radioactive waste packages to be disposed of in FRG must meet the waste acceptance requirement of the repository. Compliance with the waste acceptance requirements must be checked by a quality control. Fourteen relevant properties are necessary to be assayed. The quality control group supports the observance of the waste acceptance requirements by the following measures: -checking of the documentation of the waste producers; -random tests at conditioned radioactive wastes; -qualification of conditioning processes; -control of the qualified processes by inspections. The relevant properties of disposal are termed and their checking by non-destructive and if necessary destructive test methods will be explained as well as quality control by process control, i.e. qualification of conditioning processes by instrumentation and documentation. The mobile and stationary testing facilities will be outlined

  18. Double-Sampling Method for Carrying Out Quality Control of a Fabrication Process; Methode du Double Echantillonnage pour le Controle de la Qualite d'un Procede de Fabrication; Metod dvukh obraztsov dlya osushchestvleniya kontrolya za kachestvom v protsesse izgotovleniya; Metodo de Muestreo Doble para el Control de Calidad de un Proceso de Fabricacion

    Energy Technology Data Exchange (ETDEWEB)

    Cerrolaza, J. A.; Lago, A.; Montojo, Rosa M. [Junta de Energia Nuclear, Madrid (Spain)

    1966-02-15

    In fabricating components for use in reactors, two basic factors are of decisive importance, namely the need for very high quality, which allows of only a very small percentage of defective parts, and the very high cost of each of the components. Because of these two considerations, control during fabrication has to follow an operating curve with a very high power and, provided that this condition is fulfilled, the number of pares destroyed in each inspection has to be kept to a minimum. The usual methods, which are based on the determination of the error of first kind, cannot be used because they are generally not effective enough. Cave has developed a method in which the size of the samples and the limits of control are established as a function of the errors of first and second kind. This method, although applicable, is not really practicable for the inspection of reactor components since the samples required are too large. The present paper presents a method which is similar to that of Cave but which relies on double sampling and thus considerably reduces the average size of the sample. (author) [French] La fabrication des elements constitutifs des reacteurs nucleaires presente deux caracteristiques essentielles, qui la conditionnent: la qualite superieure exigee reduit fortement le pourcentage des pieces defectueuses que l'on peut admettre et le prix de revient de chaque element est tres eleve. Etant donne ces deux conditions, les controles en cours de fabrication doivent se multiplier a mesure que l'on avance dans la chaftie des operations; d'autre part, il faut que le nombre des pieces detruites lors de chaque inspection soit aussi reduit que possible, tout en respectant la premiere condition. Les methodes habituelles de controle qui visent essentiellement a limiter le risque inherent a la premiere condition ne sauraient etre appliquees car, d'une maniere generale, elles ne sont pas suffisamment efficaces. Cave a mis au point une methode dans laquelle la

  19. Quality control activities in the environmental radiology laboratory

    International Nuclear Information System (INIS)

    Llaurado, M.; Quesada, D.; Rauret, G.; Tent, J.; Zapata, D.

    2006-01-01

    During the last twenty years many analytical laboratories have implemented quality assurance systems. A quality system implementation requires documentation of all activities (technical and management), evaluation of these activities and its continual improvement. Implementation and adequate management of all the elements a quality system includes are not enough to guarantee quality of the analytical results generated at a time. That is the aim of a group of specific activities labelled as quality control activities. The Laboratori de Radiologia Ambiental (Environmental Radiology Laboratory; LRA) at the University of Barcelona was created in 1984 to carry out part of the quality control assays of the Environmental Radiology Monitoring Programs around some of the Spanish nuclear power plants, which are developed by the Servei Catala d'Activitats Energetiques (SCAR) and the Consejo de Seguridad Nuclear (CSN), organisations responsible for nuclear security and radiological protection. In these kind of laboratories, given the importance of the results they give, quality control activities become an essential aspect. In order to guarantee the quality of its analytical results, the LRA Direction decided to adopt the international standard UNE-EN ISO/IEC 17025 for its internal quality system and to accreditate some of the assays it carries out. In such as system, it is established, the laboratory shall monitor the validity of tests undertaken and data shall be recorded in such a way that trends are detectable. The present work shows the activities carried out in this way by the LRA, which are: Equipment control activities which in the special case of radiochemical techniques include measurement of backgrounds and blanks as well as periodical control of efficiency and resolution. Activities to assure the specifications settled by method validation, which are testing of reference materials and periodical analysis of control samples. Evaluation of the laboratory work quality

  20. Control method for prosthetic devices

    Science.gov (United States)

    Bozeman, Richard J., Jr. (Inventor)

    1995-01-01

    A control system and method for prosthetic devices is provided. The control system comprises a transducer for receiving movement from a body part for generating a sensing signal associated with that movement. The sensing signal is processed by a linearizer for linearizing the sensing signal to be a linear function of the magnitude of the distance moved by the body part. The linearized sensing signal is normalized to be a function of the entire range of body part movement from the no-shrug position of the moveable body part. The normalized signal is divided into a plurality of discrete command signals. The discrete command signals are used by typical converter devices which are in operational association with the prosthetic device. The converter device uses the discrete command signals for driving the moveable portions of the prosthetic device and its sub-prosthesis. The method for controlling a prosthetic device associated with the present invention comprises the steps of receiving the movement from the body part, generating a sensing signal in association with the movement of the body part, linearizing the sensing signal to be a linear function of the magnitude of the distance moved by the body part, normalizing the linear signal to be a function of the entire range of the body part movement, dividing the normalized signal into a plurality of discrete command signals, and implementing the plurality of discrete command signals for driving the respective moveable prosthesis device and its sub-prosthesis.

  1. Quality Control Assessment of Radiology Devices in Kerman Province, Iran

    OpenAIRE

    Zahra Jomehzadeh; Ali Jomehzadeh; Mohammad Bagher Tavakoli

    2016-01-01

    Introduction Application of quality control (QC) programs at diagnostic radiology departments is of great significance for optimization of image quality and reduction of patient dose. The main objective of this study was to perform QC tests on stationary radiographic X-ray machines, installed in 14 hospitals of Kerman province, Iran. Materials and Methods In this cross-sectional study, QC tests were performed on 28 conventional radiographic X-ray units in Kerman governmental hospitals, based ...

  2. Quality control of radioactive waste disposal container for borehole project

    International Nuclear Information System (INIS)

    Mohamad Pauzi Ismail; Suhairy Sani; Azhar Azmi; Ilham Mukhriz Zainal Abidin

    2014-01-01

    This paper explained quality control of radioactive disposal container for the borehole project. Non-destructive Testing (NDT) is one of the quality tool used for evaluating the product. The disposal container is made of 316L stainless steel. The suitable NDT method for this object is radiography, ultrasonic, penetrant and eddy current testing. This container will be filled with radioactive capsules and cement mortar is grouted to fill the gap. The results of NDT measurements are explained and discussed. (author)

  3. Work organisation and quality control in a welding robotic cell

    OpenAIRE

    Moniz, António

    1993-01-01

    In this paper is analyzed the work organization and the forms of quality control in a robotic welding station in a company of office equipment and metal components manufacturing. The robotic cell is recent and works in two shifts. Quality and production rationalization implied in this firms the adoption of a strategy of organization of teamwork, and it is supported the collaborative tools to decrease the possibilities for errors and to improve means and methods of manufacturing. The analysis ...

  4. Quality control and characterization of bentonite materials

    International Nuclear Information System (INIS)

    Kiviranta, L.; Kumpulainen, S.

    2011-12-01

    . Thus, in a certain extent, index tests can be used to determine the smectite content indicatively for quality control purposes. Previously set acceptance testing requirement limits for swelling index, liquid limit and CEC should be reconsidered, since Ca-bentonite tested in this study did not fulfill the requirement for swelling index, the previously set liquid limit requirement value was way below the values measured in this study, and because the previously set CEC requirement limits were based on a technique that needed different requirement limits for Na- and Ca-bentonites, on contrary to the method used in this study.(orig.)

  5. SALE, Quality Control of Analytical Chemical Measurements

    International Nuclear Information System (INIS)

    Bush, W.J.; Gentillon, C.D.

    1985-01-01

    1 - Description of problem or function: The Safeguards Analytical Laboratory Evaluation (SALE) program is a statistical analysis program written to analyze the data received from laboratories participating in the SALE quality control and evaluation program. The system is aimed at identifying and reducing analytical chemical measurement errors. Samples of well-characterized materials are distributed to laboratory participants at periodic intervals for determination of uranium or plutonium concentration and isotopic distributions. The results of these determinations are statistically evaluated and participants are informed of the accuracy and precision of their results. 2 - Method of solution: Various statistical techniques produce the SALE output. Assuming an unbalanced nested design, an analysis of variance is performed, resulting in a test of significance for time and analyst effects. A trend test is performed. Both within- laboratory and between-laboratory standard deviations are calculated. 3 - Restrictions on the complexity of the problem: Up to 1500 pieces of data for each nuclear material sampled by a maximum of 75 laboratories may be analyzed

  6. Ways to control quality of electric equipment in the coal industry

    Energy Technology Data Exchange (ETDEWEB)

    Shipilov, A.D.; Nabokov, E.P.

    1982-01-01

    A structure is proposed for organization in the coal industry of a permanent service for controlling quality of electrical engineering equipment. A form was developed for introduction of recommendations to improve quality. Methods are suggested for evaluating the quality level as applied to specific tasks of controlling quality of the electrical equipment used in mining.

  7. Data Organization for Quality Control Test

    International Nuclear Information System (INIS)

    Yahaya Talib; Glam Hadzir Patai Mohamad; Wan Hamirul Bahrin Wan Kamal

    2011-01-01

    Test data and results for quality control of Mo-99/ Tc-99m generator shall be organized properly. A computer program was developed using Visual Basic 6.0 to process test data, store data and results to specific folder, generate test reports and certificates. Its performance has been evaluated and tested. (author)

  8. Water quality control program in experimental circuits

    International Nuclear Information System (INIS)

    Cegalla, Miriam A.

    1996-01-01

    The Water Quality Control Program of the Experimental Circuits visualizes studying the water chemistry of the cooling in the primary and secondary circuits, monitoring the corrosion of the systems and studying the mechanism of the corrosion products transport in the systems. (author)

  9. Guidelines for radriopharmaceutical quality control in hospitals

    International Nuclear Information System (INIS)

    Welsh, W.J.

    1982-01-01

    This document has been prepared to assist hospital administrators in ensuring that adequate quality control is performed on radiopharmaceuticals administered to their patients. Three sets of guidelines are presented, the degree of sophistication being dependent on the amount of hospital involvement in the radiopharmaceutical preparation

  10. Outsourcing University Degrees: Implications for Quality Control

    Science.gov (United States)

    Edwards, Julie; Crosling, Glenda; Edwards, Ron

    2010-01-01

    Education institutions worldwide have and continue to seek opportunities to spread their offerings abroad. While the provision of courses to students located overseas through partner institutions has many advantages, it raises questions about quality control that are not as applicable to other forms of international education. This paper uses a…

  11. Quality control of radioactive waste products

    International Nuclear Information System (INIS)

    Martens, B.R.; Warnecke, E.; Odoj, R.

    1986-01-01

    The variety of incoming untreated wastes, treatment methods, waste forms and containers requires a great variety of controlling methods and principles to be applied both during waste treatment and on the final product. The paper describes product control schemes and methods, sampling systems and transportable testing equipment for waste drums, and equipment for waste cementation using in-drum stirring and subsequent fixation of solid wastes in the flowable product. (DG) [de

  12. Quality control of parasitology stool examination in Tabriz clinical laboratories

    Directory of Open Access Journals (Sweden)

    shahram Khademvatan

    2011-06-01

    Full Text Available The purpose of quality control program was to make doctors and laboratory personnel trust in laboratory results and consequently increasing confidence in laboratory achievements. The quality assurance means raising the level of quality in all tests that lead to raising the level of work efficiency and laboratories including minimum expense for society and minimum time for lab personnel. This study aimed to assess and determine the accuracy and precision of results in Tabriz medical diagnostic laboratories. Materials and Methods: In this retrospective study, 790 stool samples were selected randomly and tested by standard methods.Student t- test, SPSS software and sensitivity and accuracy formulas were used for data analysis. Results: The sensitivity was 62%, 22% and 8% with 95% confidence intervals for worm's eggs, protozoan cysts and trophozoite detection respectively. Conclusion: To elevate quality assurance in clinical diagnostic laboratory, monitoring and check of the laboratories by standard methods continually should be done.

  13. The role and relevance of quality assurance to quality control

    International Nuclear Information System (INIS)

    Churchill, G.F.

    1989-01-01

    The paper describes the development of Quality Assurance as a total management technique, incorporating manufacturing and construction Quality Control, to give confidence of satisfactory in-service performance. The application of QA to the Heysham 2 and Torness AGR projects design and construction is defined with particular reference to the development of a QA requirements specification, delegation of QA responsibility through the hierarchy of purchasers and suppliers of plant and material, the role of the QA organization and QA auditing. The paper discusses the effectiveness and benefits of QA and the problems identified in its application and implementation. The problems, their solutions and longer term improvements to reduce the costs of QA as well as enhancing confidence in the satisfactory performance of future nuclear projects, are described. (author)

  14. Quality assurance and quality control of nuclear engineering during construction phase

    International Nuclear Information System (INIS)

    Zhang Zhihua; Deng Yue; Liu Yaoguang; Xu Xianqi; Zhou Shan; Qian Dazhi; Zhang Yang

    2007-01-01

    The quality assurance (QA) and quality control (QC) is a very important work in the nuclear engineering. This paper starts with how to establish quality assurance system of nuclear engineering construction phase, then introduces several experiments and techniques such as the implementation of quality assurance program, the quality assurance and quality control of contractors, the quality surveillance and control of supervisory companies, quality assurance audit and surveillance of builders. (authors)

  15. Quality control of scintillation cameras (planar and SPECT)

    International Nuclear Information System (INIS)

    Shaekhoon, E.S.

    2008-01-01

    Regular quality control is one of the corner stones of nuclear medicine and a prerequisite for adequate diagnostic imaging. Many papers have been published on quality control of planar and SPECT imaging system up to now, however only minor attenuation has been given to the assessment of the performance of imaging systems. In this research we are going to discuss a comprehensive set of test procedures including regular quality control. Our purpose is to go through analysis of the methods and results then to test our hypothesis which state that there is strong relationship between regular and proper evaluation of quality control and the continuity of better medical services in nuclear medicine department. The selection of the tests is discussed and the tests are described, then results are presented. In addition action thresholds are proposed. The quality control tests can be applied to systems with either a moving detector or a moving image table, and to both detector with a large field of view and detectors with a small field of view. The tests presented on this research do not required special phantoms or sources other than those used for quality control of stationary gamma camera and SPECT. They can be applied for acceptance testing and for performance testing in a regular quality assurance program. The data has been evaluated based on me diso software in comparing with IAEA expert software and system specification within the reference values. Our final results confirm our hypothesis, there are some comments about the characteristics and performance of this system that being observed and solved, then a departmental protocol for routine quality control (Q.C) has being established.(Author)

  16. Process control and optimization with simple interval calculation method

    DEFF Research Database (Denmark)

    Pomerantsev, A.; Rodionova, O.; Høskuldsson, Agnar

    2006-01-01

    for the quality improvement in the course of production. The latter is an active quality optimization, which takes into account the actual history of the process. The advocate approach is allied to the conventional method of multivariate statistical process control (MSPC) as it also employs the historical process......Methods of process control and optimization are presented and illustrated with a real world example. The optimization methods are based on the PLS block modeling as well as on the simple interval calculation methods of interval prediction and object status classification. It is proposed to employ...... the series of expanding PLS/SIC models in order to support the on-line process improvements. This method helps to predict the effect of planned actions on the product quality and thus enables passive quality control. We have also considered an optimization approach that proposes the correcting actions...

  17. Quality control of the documentation process in electronic economic activities

    Directory of Open Access Journals (Sweden)

    Krutova A.S.

    2017-06-01

    Full Text Available It is proved that the main tool that will provide adequate information resources e economic activities of social and economic relations are documenting quality control processes as the basis of global information space. Directions problems as formation evaluation information resources in the process of documentation, namely development tools assess the efficiency of the system components – qualitative assessment; development of mathematical modeling tools – quantitative evaluation. A qualitative assessment of electronic documentation of economic activity through exercise performance, efficiency of communication; document management efficiency; effectiveness of flow control operations; relationship management effectiveness. The concept of quality control process documents electronically economic activity to components which include: the level of workflow; forms adequacy of information; consumer quality documents; quality attributes; type of income data; condition monitoring systems; organizational level process documentation; attributes of quality, performance quality consumer; type of management system; type of income data; condition monitoring systems. Grounded components of the control system electronic document subjects of economic activity. Detected components IT-audit management system economic activity: compliance audit; audit of internal control; detailed multilevel analysis; corporate risk assessment methodology. The stages and methods of processing electronic transactions economic activity during condition monitoring of electronic economic activity.

  18. Quality and Control of Water Vapor Winds

    Science.gov (United States)

    Jedlovec, Gary J.; Atkinson, Robert J.

    1996-01-01

    Water vapor imagery from the geostationary satellites such as GOES, Meteosat, and GMS provides synoptic views of dynamical events on a continual basis. Because the imagery represents a non-linear combination of mid- and upper-tropospheric thermodynamic parameters (three-dimensional variations in temperature and humidity), video loops of these image products provide enlightening views of regional flow fields, the movement of tropical and extratropical storm systems, the transfer of moisture between hemispheres and from the tropics to the mid- latitudes, and the dominance of high pressure systems over particular regions of the Earth. Despite the obvious larger scale features, the water vapor imagery contains significant image variability down to the single 8 km GOES pixel. These features can be quantitatively identified and tracked from one time to the next using various image processing techniques. Merrill et al. (1991), Hayden and Schmidt (1992), and Laurent (1993) have documented the operational procedures and capabilities of NOAA and ESOC to produce cloud and water vapor winds. These techniques employ standard correlation and template matching approaches to wind tracking and use qualitative and quantitative procedures to eliminate bad wind vectors from the wind data set. Techniques have also been developed to improve the quality of the operational winds though robust editing procedures (Hayden and Veldon 1991). These quality and control approaches have limitations, are often subjective, and constrain wind variability to be consistent with model derived wind fields. This paper describes research focused on the refinement of objective quality and control parameters for water vapor wind vector data sets. New quality and control measures are developed and employed to provide a more robust wind data set for climate analysis, data assimilation studies, as well as operational weather forecasting. The parameters are applicable to cloud-tracked winds as well with minor

  19. Seminal quality prediction using data mining methods.

    Science.gov (United States)

    Sahoo, Anoop J; Kumar, Yugal

    2014-01-01

    Now-a-days, some new classes of diseases have come into existences which are known as lifestyle diseases. The main reasons behind these diseases are changes in the lifestyle of people such as alcohol drinking, smoking, food habits etc. After going through the various lifestyle diseases, it has been found that the fertility rates (sperm quantity) in men has considerably been decreasing in last two decades. Lifestyle factors as well as environmental factors are mainly responsible for the change in the semen quality. The objective of this paper is to identify the lifestyle and environmental features that affects the seminal quality and also fertility rate in man using data mining methods. The five artificial intelligence techniques such as Multilayer perceptron (MLP), Decision Tree (DT), Navie Bayes (Kernel), Support vector machine+Particle swarm optimization (SVM+PSO) and Support vector machine (SVM) have been applied on fertility dataset to evaluate the seminal quality and also to predict the person is either normal or having altered fertility rate. While the eight feature selection techniques such as support vector machine (SVM), neural network (NN), evolutionary logistic regression (LR), support vector machine plus particle swarm optimization (SVM+PSO), principle component analysis (PCA), chi-square test, correlation and T-test methods have been used to identify more relevant features which affect the seminal quality. These techniques are applied on fertility dataset which contains 100 instances with nine attribute with two classes. The experimental result shows that SVM+PSO provides higher accuracy and area under curve (AUC) rate (94% & 0.932) among multi-layer perceptron (MLP) (92% & 0.728), Support Vector Machines (91% & 0.758), Navie Bayes (Kernel) (89% & 0.850) and Decision Tree (89% & 0.735) for some of the seminal parameters. This paper also focuses on the feature selection process i.e. how to select the features which are more important for prediction of

  20. EFFECT OF QUALITY CONTROL SYSTEM ON AUDIT QUALITY WITH PROFESSIONAL COMMITMENTS AS A MODERATION VARIABLE

    Directory of Open Access Journals (Sweden)

    Ramadhani R.

    2017-12-01

    Full Text Available This study aims to test the effect of every element of Quality Control System (QCS that is leadership responsibilities for quality on audit, relevant ethical requirements, acceptance and continuance of client relationships and certain engagements, assignment of engagement team, engagement performance, monitoring, and documentation on audit quality as well as to test whether the professional commitment moderate effect of every element of QCS on audit quality. The population was the staff auditors working in public accounting firms domiciled in Jakarta City, especially Central Jakarta area with the drawing of 84 respondents. The statistical method used was SEM PLS with the help of SmartPLS application. The results of this study indicate that from seven elements of QCS, only relevant ethical requirements that affect on audit quality. Furthermore, the study also found that professional commitment cannot moderate the relationship between the seven elements of QCS on audit quality.

  1. Quality Control Tests on Andrographis paniculata Nees (Family ...

    African Journals Online (AJOL)

    Purpose: To characterize the aerial parts of Andrographis paniculata, a bitter Indian herb grown in Nigeria, for the purpose of quality control. Methods: The determination of bitterness value and of various physicochemical characteristics; tests for key phytochemicals; and thin layer chromatography (TLC) of the air-dried herb, ...

  2. 46 CFR 164.019-13 - Production quality control requirements.

    Science.gov (United States)

    2010-10-01

    ... establish procedures for maintaining quality control of the materials used in production, manufacturing... place of manufacture unless alternate procedures have been accepted by the Commandant. (c) Production... manufactured. A new lot must be started whenever any change is made in materials, design, or production method...

  3. Quality control for retinal OCT in multiple sclerosis

    DEFF Research Database (Denmark)

    Schippling, S; Balk, Lj; Costello, F

    2015-01-01

    to provide guidance on the use of validated quality control (QC) criteria for the use of OCT in MS research and clinical trials. METHODS: A prospective multi-centre (n = 13) study. Peripapillary ring scan QC rating of an OCT training set (n = 50) was followed by a test set (n = 50). Inter-rater agreement...

  4. 42 CFR 84.40 - Quality control plans; filing requirements.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Quality control plans; filing requirements. 84.40... Control § 84.40 Quality control plans; filing requirements. As a part of each application for approval or... proposed quality control plan which shall be designed to assure the quality of respiratory protection...

  5. 21 CFR 211.22 - Responsibilities of quality control unit.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 4 2010-04-01 2010-04-01 false Responsibilities of quality control unit. 211.22... Personnel § 211.22 Responsibilities of quality control unit. (a) There shall be a quality control unit that... have been fully investigated. The quality control unit shall be responsible for approving or rejecting...

  6. 30 CFR 28.30 - Quality control plans; filing requirements.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Quality control plans; filing requirements. 28... PROTECTION FOR TRAILING CABLES IN COAL MINES Quality Control § 28.30 Quality control plans; filing... part, each applicant shall file with MSHA a proposed quality control plan which shall be designed to...

  7. Quality control of mammography departments in Slovakia

    International Nuclear Information System (INIS)

    Horvathova, M.; Nikodemova, D.

    2007-01-01

    Complete test of publication follows. Considering the fact that mammary gland is the most sensitive organ to ionizing radiation, the Commission of the Ministry of Health of SR for QA in radiology organized a pilot two-run country wide audit conducted in 42 mammography departments that have met the beforehand criteria. During the audit the methods for establishing the individual parameters in technical and clinical part of quality assurance in mammography were elaborated and implemented. Technical and clinical parameters of the imaging process that mostly affect the quality of diagnostic information were followed up. These parameters included: the object thickness compensation, optical density deviation, evaluation of the film quality by means of special phantom, etc. Important measurement of ESDs at participating departments enabled to compare the radiation load of mammography patients in Slovakia with reference values in European guidelines. The uniform standard method for QA at mammography departments was elaborated and published as the regulation of the Ministry of Health for performance of preventive mammography examinations in SR. The presented results show the improved quality of mammography examinations due to regular check-ups of technical and clinical parameters and fulfilment of the required values in all parameters. The audit results are the basis for continuous quality assessment of mammography departments as a main prerequisite for conducting preventive examinations and for health insurance purposes.

  8. Quality Controlling CMIP datasets at GFDL

    Science.gov (United States)

    Horowitz, L. W.; Radhakrishnan, A.; Balaji, V.; Adcroft, A.; Krasting, J. P.; Nikonov, S.; Mason, E. E.; Schweitzer, R.; Nadeau, D.

    2017-12-01

    As GFDL makes the switch from model development to production in light of the Climate Model Intercomparison Project (CMIP), GFDL's efforts are shifted to testing and more importantly establishing guidelines and protocols for Quality Controlling and semi-automated data publishing. Every CMIP cycle introduces key challenges and the upcoming CMIP6 is no exception. The new CMIP experimental design comprises of multiple MIPs facilitating research in different focus areas. This paradigm has implications not only for the groups that develop the models and conduct the runs, but also for the groups that monitor, analyze and quality control the datasets before data publishing, before their knowledge makes its way into reports like the IPCC (Intergovernmental Panel on Climate Change) Assessment Reports. In this talk, we discuss some of the paths taken at GFDL to quality control the CMIP-ready datasets including: Jupyter notebooks, PrePARE, LAMP (Linux, Apache, MySQL, PHP/Python/Perl): technology-driven tracker system to monitor the status of experiments qualitatively and quantitatively, provide additional metadata and analysis services along with some in-built controlled-vocabulary validations in the workflow. In addition to this, we also discuss the integration of community-based model evaluation software (ESMValTool, PCMDI Metrics Package, and ILAMB) as part of our CMIP6 workflow.

  9. Robustness study in SSNTD method validation: indoor radon quality

    International Nuclear Information System (INIS)

    Dias, D.C.S.; Silva, N.C.; Bonifácio, R.L.

    2017-01-01

    Quality control practices are indispensable to organizations aiming to reach analytical excellence. Method validation is an essential component to quality systems in laboratories, serving as a powerful tool for standardization and reliability of outcomes. This paper presents a study of robustness conducted over a SSNTD technique validation process, with the goal of developing indoor radon measurements at the highest level of quality. This quality parameter indicates how well a technique is able to provide reliable results in face of unexpected variations along the measurement. In this robustness study, based on the Youden method, 7 analytical conditions pertaining to different phases of the SSNTD technique (with focus on detector etching) were selected. Based on the ideal values for each condition as reference, extreme levels regarded as high and low were prescribed to each condition. A partial factorial design of 8 unique etching procedures was defined, where each presented their own set of high and low condition values. The Youden test provided 8 indoor radon concentration results, which allowed percentage estimations that indicate the potential influence of each analytical condition on the SSNTD technique. As expected, detector etching factors such as etching solution concentration, temperature and immersion time were identified as the most critical parameters to the technique. Detector etching is a critical step in the SSNTD method – one that must be carefully designed during validation and meticulously controlled throughout the entire process. (author)

  10. Robustness study in SSNTD method validation: indoor radon quality

    Energy Technology Data Exchange (ETDEWEB)

    Dias, D.C.S.; Silva, N.C.; Bonifácio, R.L., E-mail: danilacdias@gmail.com [Comissao Nacional de Energia Nuclear (LAPOC/CNEN), Pocos de Caldas, MG (Brazil). Laboratorio de Pocos de Caldas

    2017-07-01

    Quality control practices are indispensable to organizations aiming to reach analytical excellence. Method validation is an essential component to quality systems in laboratories, serving as a powerful tool for standardization and reliability of outcomes. This paper presents a study of robustness conducted over a SSNTD technique validation process, with the goal of developing indoor radon measurements at the highest level of quality. This quality parameter indicates how well a technique is able to provide reliable results in face of unexpected variations along the measurement. In this robustness study, based on the Youden method, 7 analytical conditions pertaining to different phases of the SSNTD technique (with focus on detector etching) were selected. Based on the ideal values for each condition as reference, extreme levels regarded as high and low were prescribed to each condition. A partial factorial design of 8 unique etching procedures was defined, where each presented their own set of high and low condition values. The Youden test provided 8 indoor radon concentration results, which allowed percentage estimations that indicate the potential influence of each analytical condition on the SSNTD technique. As expected, detector etching factors such as etching solution concentration, temperature and immersion time were identified as the most critical parameters to the technique. Detector etching is a critical step in the SSNTD method – one that must be carefully designed during validation and meticulously controlled throughout the entire process. (author)

  11. Control of Bank Consolidated Financial Statements Quality

    Directory of Open Access Journals (Sweden)

    Margarita S. Ambarchyan

    2013-01-01

    Full Text Available The author presents the multiple linear regression model of bank consolidated financial statements quality. The article considers six characteristics that can be used to estimate the level of bank consolidated financial statements quality. The multiple linear regression model was developed, using the results of point-based system of consolidated financial statements of thirty European bank and financial groups on the basis of the developed characteristics. The author offers to use the characteristic significance factor in the process of consolidated financial statements appraisal by points. The constructed regression model is checked on accuracy and statistical significance. The model can be used by internal auditors and financial analytics as an instrument for bank and non-bank consolidated financial statements quality control

  12. Quality Risk Management: Putting GMP Controls First.

    Science.gov (United States)

    O'Donnell, Kevin; Greene, Anne; Zwitkovits, Michael; Calnan, Nuala

    2012-01-01

    This paper presents a practical way in which current approaches to quality risk management (QRM) may be improved, such that they better support qualification, validation programs, and change control proposals at manufacturing sites. The paper is focused on the treatment of good manufacturing practice (GMP) controls during QRM exercises. It specifically addresses why it is important to evaluate and classify such controls in terms of how they affect the severity, probability of occurrence, and detection ratings that may be assigned to potential failure modes or negative events. It also presents a QRM process that is designed to directly link the outputs of risk assessments and risk control activities with qualification and validation protocols in the GMP environment. This paper concerns the need for improvement in the use of risk-based principles and tools when working to ensure that the manufacturing processes used to produce medicines, and their related equipment, are appropriate. Manufacturing processes need to be validated (or proven) to demonstrate that they can produce a medicine of the required quality. The items of equipment used in such processes need to be qualified, in order to prove that they are fit for their intended use. Quality risk management (QRM) tools can be used to support such qualification and validation activities, but their use should be science-based and subject to as little subjectivity and uncertainty as possible. When changes are proposed to manufacturing processes, equipment, or related activities, they also need careful evaluation to ensure that any risks present are managed effectively. This paper presents a practical approach to how QRM may be improved so that it better supports qualification, validation programs, and change control proposals in a more scientific way. This improved approach is based on the treatment of what are called good manufacturing process (GMP) controls during those QRM exercises. A GMP control can be considered

  13. Radiation therapy quality control in MRCCC radiotherapy units

    International Nuclear Information System (INIS)

    Fielda Djuita; Rina Taurisia; Andreas Nainggolan

    2011-01-01

    Increasing cancer patients in Indonesia is not supported with the number of equipment that is able to treat cancer patients, especially in the radiation therapy field. Therefore, several private hospitals have joined to provide radiation therapy services and one of them is MRCCC. As a new hospital providing services in radiotherapy field, the writer tries to present our quality control program that we have done in our hospital. Purpose: As quality control to radiation therapy clinical practice. Methods: Descriptive essay of what we do in our institution. Conclusion: Average output photon and electron lower more than tolerance dose. (author)

  14. Innovative in cellulo method as an alternative to in vivo neurovirulence test for the characterization and quality control of human live Yellow Fever virus vaccines: a pilot study

    OpenAIRE

    Da Costa , Anaelle; Prehaud , Christophe; Khou , Cécile; Pardigon , Nathalie; Saulnier , Aure; Nougarede , Nolwenn; Lafon , Monique

    2018-01-01

    International audience; Live attenuated vaccines have proved to be mostly valuable in the prevention of infectious diseases in humans, especially in developing countries. The safety and potency of vaccine, and the consistency of vaccine batch-to-batch manufacturing, must be proven before being administrated to humans. For now, the tests used to control vaccine safety largely involve animal testing. For live viral vaccines, regulations require suppliers to demonstrate the absence of neurovirul...

  15. Microbiological Quality Control of Probiotic Products

    OpenAIRE

    Astashkina, A.P.; Khudyakova, L.I.; Kolbysheva, Y.V.

    2014-01-01

    Microbiological quality control of probiotic products such as Imunele, Dannon, Pomogayka showed that they contain living cultures of the Lactobacillus Bifidobacterium genus in the amount of 107 CFU/ml, which corresponds to the number indicated on the label of products. It is identified that the survival rate of test-strains cultured with pasteurized products does not exceed 10%. The cell concentration of target-microorganisms was reduced by 20-45% after the interaction with living probiotic b...

  16. Mitochondrial quality control in cardiac diseases.

    Directory of Open Access Journals (Sweden)

    Juliane Campos

    2016-10-01

    Full Text Available Disruption of mitochondrial homeostasis is a hallmark of cardiac diseases. Therefore, maintenance of mitochondrial integrity through different surveillance mechanisms is critical for cardiomyocyte survival. In this review, we discuss the most recent findings on the central role of mitochondrial quality control processes including regulation of mitochondrial redox balance, aldehyde metabolism, proteostasis, dynamics and clearance in cardiac diseases, highlighting their potential as therapeutic targets.

  17. Quality control and the multicrystal counter

    International Nuclear Information System (INIS)

    Hart, G.C.; Davis, K.M.

    1983-01-01

    The reliability of multicrystal counters for use in counting large numbers of radioimmunoassay samples is studied. In particular, the dependencies of the outputs from the array of detectors, and hence their degree of matching, on the count rate and volume of the samples being counted are investigated. Quality control procedures are described to assist in the assurance of consistent performance of the counter in the clinical situation. (U.K.)

  18. The software quality control for gamma spectrometry

    International Nuclear Information System (INIS)

    Monte, L.

    1986-01-01

    One of major problems with wich the quality control program of an environmental measurements laboratory is confronted is the evaluation of the performances of software packages for the analysis of gamma-ray spectra. A program of tests for evaluating the performances of the software package (SPECTRAN-F, Canberra Inc.) used by our laboratory is being carried out. In this first paper the results of a preliminary study concerning the evaluation of the performance of the doublet analysis routine are presented

  19. Quality control of estrogen receptor assays.

    Science.gov (United States)

    Godolphin, W; Jacobson, B

    1980-01-01

    Four types of material have been used for the quality control of routine assays of estrogen receptors in human breast tumors. Pieces of hormone-dependent Nb rat mammary tumors gave a precision about 40%. Rat uteri and rat tumors pulverized at liquid nitrogen temperature and stored as powder yielded precision about 30%. Powdered and lyophilised human tumors appear the best with precision as good as 17%.

  20. Method for synthesis of high quality graphene

    Science.gov (United States)

    Lanzara, Alessandra [Piedmont, CA; Schmid, Andreas K [Berkeley, CA; Yu, Xiaozhu [Berkeley, CA; Hwang, Choonkyu [Albany, CA; Kohl, Annemarie [Beneditkbeuern, DE; Jozwiak, Chris M [Oakland, CA

    2012-03-27

    A method is described herein for the providing of high quality graphene layers on silicon carbide wafers in a thermal process. With two wafers facing each other in close proximity, in a first vacuum heating stage, while maintained at a vacuum of around 10.sup.-6 Torr, the wafer temperature is raised to about 1500.degree. C., whereby silicon evaporates from the wafer leaving a carbon rich surface, the evaporated silicon trapped in the gap between the wafers, such that the higher vapor pressure of silicon above each of the wafers suppresses further silicon evaporation. As the temperature of the wafers is raised to about 1530.degree. C. or more, the carbon atoms self assemble themselves into graphene.

  1. Resonant power processors. II - Methods of control

    Science.gov (United States)

    Oruganti, R.; Lee, F. C.

    1984-01-01

    The nature of resonant converter control is discussed. Employing the state-portrait, different control methods for series resonant converter are identified and their performance evaluated based on their stability, response to control and load changes and range of operation. A new control method, optimal-trajectory control, is proposed which, by utilizing the state trajectories as control laws, continuously monitors the energy level of the resonant tank. The method is shown to have superior control properties especially under transient operation.

  2. Method for enhanced control of welding processes

    Science.gov (United States)

    Sheaffer, Donald A.; Renzi, Ronald F.; Tung, David M.; Schroder, Kevin

    2000-01-01

    Method and system for producing high quality welds in welding processes, in general, and gas tungsten arc (GTA) welding, in particular by controlling weld penetration. Light emitted from a weld pool is collected from the backside of a workpiece by optical means during welding and transmitted to a digital video camera for further processing, after the emitted light is first passed through a short wavelength pass filter to remove infrared radiation. By filtering out the infrared component of the light emitted from the backside weld pool image, the present invention provides for the accurate determination of the weld pool boundary. Data from the digital camera is fed to an imaging board which focuses on a 100.times.100 pixel portion of the image. The board performs a thresholding operation and provides this information to a digital signal processor to compute the backside weld pool dimensions and area. This information is used by a control system, in a dynamic feedback mode, to automatically adjust appropriate parameters of a welding system, such as the welding current, to control weld penetration and thus, create a uniform weld bead and high quality weld.

  3. Development and validation of RP-HPLC method for determination of famotidine and its application in quality control of different pharmaceutical dosage forms

    International Nuclear Information System (INIS)

    Hassan, S.S.; Ayub, M.; Ishtiaq, S.; Ahmad; I; Khalid, N.

    2013-01-01

    A precise and fast novel high-performance liquid chromatography method was developed and validated for the quantitative determination of Famotidine (FMT) in commercially available pharmaceutical dosage forms. An Agilent 1200 Series High Performance Liquid Chromatography (HPLC) system having the column C 1 8 (5 micro m particle size, 150*4.6 mm) was used in this study and detection (diode array detector) was made at 280 nm. The mobile phase was acetonitrile, distilled water, triethylamine and phosphoric acid (49.9:49.9:0.1:0.1, v/v), isocratic elution under ambient temperature at flow rate of 1.5 mL min/sup -1/ with injection volume 5 micro L. In this method, the retention times for FMT pure, tablets and suspension were 0.787 min, 0.789 min and 0.839 minutes respectively. The new method was validated by different validation parameters. The procedure provided a linear response over the concentration range of 0.1-1.0 mg mL/sup -1/ (r/sup 2/ =0.998) and equation was y=3902.6+18.651. The mean % recovery for inter-day (96.56%) and intra-day (97.36%) assuring a good precision and accuracy was 96-98%. The method was found to be very rapid and the overall assay time was less than 2 minutes and the results obtained were accurate, precise and selective enough to allow the determination of FMT in the presence of certain excipients. (author)

  4. Possible approaches to fast quality control of IFE targets

    International Nuclear Information System (INIS)

    Koresheva, E.R.; Nikitenko, A.I.; Aleksandrova, I.V.; Bazdenkov, S.V.; Belolipetskiy, A.A.; Chtcherbakov, V.I.; Osipov, I.E.

    2006-01-01

    In recent years, research into the development of reliable methods and techniques for characterization and quality control of ICF/IFE targets has been carried out very actively. This is motivated by the need to provide the means for precise and accurate knowledge of cryogenic target parameters. On the other hand, particular emphasis should be paid to the fact that fuelling of a commercial power plant requires ∼6 targets each second. This indicates that the development of fast quality control techniques is of critical importance as well. Therefore, in this report we discuss the issues underlying the construction of different algorithms for characterization and quality control of ICF/IFE targets. Among them are: (a) algorithm banks and their structure, (b) algorithm testing, (c) target reconstruction experiments. The algorithm bank incorporates the algorithms for two stages of target production: the stage of fuel layering technique development (motionless target) and the stage of cryogenic target delivery (injected target). In the first case an inverse algorithm for individual target characterization (3D target reconstruction) and two threshold algorithms for fast control of target quality are presented. They are based on tomographic information processing methods. Experimentally, tomographic data acquisition is carried out by a hundred projections microtomograph. The spatial resolution of the optical system of the microtomograph is 1 μm for 490 nm wavelength, the accuracy of target angular positioning is ±1.5-2.5 min. In the second case we describe the algorithm based on Fourier transform holography for ultra fast target characterization during its injection. The performed computer experiments have demonstrated much promise of this approach in the following directions: recognition of the target imperfections in both low- and high- harmonics; quality control of both a single target and a target batch; simultaneous control of both an injected target quality and

  5. Statistical process control for radiotherapy quality assurance

    International Nuclear Information System (INIS)

    Pawlicki, Todd; Whitaker, Matthew; Boyer, Arthur L.

    2005-01-01

    Every quality assurance process uncovers random and systematic errors. These errors typically consist of many small random errors and a very few number of large errors that dominate the result. Quality assurance practices in radiotherapy do not adequately differentiate between these two sources of error. The ability to separate these types of errors would allow the dominant source(s) of error to be efficiently detected and addressed. In this work, statistical process control is applied to quality assurance in radiotherapy for the purpose of setting action thresholds that differentiate between random and systematic errors. The theoretical development and implementation of process behavior charts are described. We report on a pilot project is which these techniques are applied to daily output and flatness/symmetry quality assurance for a 10 MV photon beam in our department. This clinical case was followed over 52 days. As part of our investigation, we found that action thresholds set using process behavior charts were able to identify systematic changes in our daily quality assurance process. This is in contrast to action thresholds set using the standard deviation, which did not identify the same systematic changes in the process. The process behavior thresholds calculated from a subset of the data detected a 2% change in the process whereas with a standard deviation calculation, no change was detected. Medical physicists must make decisions on quality assurance data as it is acquired. Process behavior charts help decide when to take action and when to acquire more data before making a change in the process

  6. 7 CFR 58.642 - Quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Quality control tests. 58.642 Section 58.642... Procedures § 58.642 Quality control tests. All mix ingredients shall be subject to inspection for quality and condition throughout each processing operation. Quality control tests shall be made on flow line samples as...

  7. 7 CFR 58.928 - Quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Quality control tests. 58.928 Section 58.928... Procedures § 58.928 Quality control tests. All dairy products and other ingredients shall be subject to inspection for quality and condition throughout each processing operation. Quality control tests shall be...

  8. 7 CFR 58.335 - Quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Quality control tests. 58.335 Section 58.335... Procedures § 58.335 Quality control tests. All milk, cream and related products are subject to inspection for quality and condition throughout each processing operation. Quality control tests shall be made on flow...

  9. Innovative in cellulo method as an alternative to in vivo neurovirulence test for the characterization and quality control of human live Yellow Fever virus vaccines: A pilot study.

    Science.gov (United States)

    da Costa, Anaelle; Prehaud, Christophe; Khou, Cecile; Pardigon, Nathalie; Saulnier, Aure; Nougarede, Nolwenn; Lafon, Monique

    2018-05-01

    Live attenuated vaccines have proved to be mostly valuable in the prevention of infectious diseases in humans, especially in developing countries. The safety and potency of vaccine, and the consistency of vaccine batch-to-batch manufacturing, must be proven before being administrated to humans. For now, the tests used to control vaccine safety largely involve animal testing. For live viral vaccines, regulations require suppliers to demonstrate the absence of neurovirulence in animals, principally in non-human primates and mice. In a search to reduce the use of animals and embracing the 3Rs principles (Replacement, Reduction, Refinement in the use of laboratory animals), we developed a new Blood-Brain Barrier Minibrain (BBB-Minibrain) in cellulo device to evaluate the neuroinvasiveness/neurovirulence of live Yellow Fever virus (YFV) vaccines. A pilot study was performed using the features of two distinct YFV strains, with the ultimate goal of proposing a companion test to characterize YFV neurovirulence. Here, we demonstrate that the BBB-Minibrain model is a promising alternative to consider for future replacement of YFV vaccine in vivo neurovirulence testing (see graphical abstract). Copyright © 2018. Published by Elsevier Ltd.

  10. Functional method implementation of post-crop conservation of melon cantaloupe, using ionizing radiation as quality control technique in productive chain

    International Nuclear Information System (INIS)

    Siqueira, Alessandra A.Z. Cozzo de; Matraia, Clarice; Walder, Julio Marcos M.; Spoto, Marta H.F.; Silva, Paula P.M. da; Maretti, Marina S.

    2005-01-01

    The Brazilian fruit culture is an alternative to minimize the lack-of-food problem using management and post harvest appropriate techniques. Gamma radiation technology is a possible technique used for food, enlarging its shelf-life, eliminating pathogenic microorganisms and in the quarantine treatment. The irradiation with seven doses (150,300,450,600,750 and 900 Gy) was used in Cantaloupe melon (Cucumis melon var. Cantaloupensis) aiming to establish the minimum, maximum and ideal doses, according to Brazilian laws, analyzing weight, color, firmness, pulp and juice quantity and sensory aspects, using the Difference Control Test. The results indicate that storage influenced significantly the weight, color and pulp quantity parameters. Doses higher than 450 Gy however influenced the firmness, juice quantity and sensory aspects characteristics. These results are indicating that the minimum dose was 150 Gy, the maximum dose was 900 Gy and the ideal dose for the quarantine treatment and to increase shelf-life of the Cantaloupe melon was 450 Gy. The data obtained allowed us to conclude that the ionizing radiation can increase the shelf-life of the Cantaloupe melon using doses up to 450 Gy making it proper to exportation. (author)

  11. Development of phantom periapical for control quality

    International Nuclear Information System (INIS)

    Mendes, J.M.S.; Sales Junior, E.S.; Ferreira, F.C.L.; Paschoal, C.M.M.

    2015-01-01

    This study aimed to develop a dental phantom with cysts for evaluation of periapical radiographs that was tested in private dental offices in the city of Maraba, northern Brazil. Through some tests with the object simulator (phantom) were obtained 12 periapical radiographs (one in each of the offices visited) that waking up to the standards of Ordinance No. 453 were visually evaluated by observing the physical parameters of exposure (kVp and mA), time revelation of the radiographic film, later the other radiographs were visually compared with C6 ray set as the default. Among the results, it was found that only two of the twelve rays cysts could not be viewed and, therefore, these two images were deemed unsuitable for accurate diagnosis in the 10 images the cysts could be displayed, however according the images have different qualities comparisons. In addition, it can be concluded that the performance of the phantom was highly satisfactory showing to be efficient for use in quality control testing of dental X-rays, the quality control of radiographs and continuing education of dental professionals for a price much more accessible. (authors)

  12. Quality Management of CERN Vacuum Controls

    CERN Document Server

    Antoniotti, F; Fortescue-Beck, E; Gama, J; Gomes, P; Le Roux, P; Pereira, H; Pigny, G

    2014-01-01

    The vacuum controls Section (TE-VSC-ICM) is in charge of the monitoring, maintenance and consolidation of the control systems of all accelerators and detectors in CERN; this represents 6 000 instruments distributed along 128 km of vacuum chambers, often of heterogeneous architectures and of diverse technical generations. In order to improve the efficiency of the services provided by ICM, to vacuum experts and to accelerator operators, a Quality Management Plan is being put into place. The first step was the standardization of the naming convention across different accelerators. The traceability of problems, requests, repairs, and other actions, has also been put into place (VTL). This was combined with the effort to identify each individual device by a coded label, and register it in a central database (MTF). Occurring in parallel, was the gathering of old documents and the centralization of information concerning architectures, procedures, equipment and settings (EDMS). To describe the topology of control c...

  13. Express quality control of chicken eggs by machine vision

    Science.gov (United States)

    Gorbunova, Elena V.; Chertov, Aleksandr N.; Peretyagin, Vladimir S.; Korotaev, Valery V.; Arbuzova, Evgeniia A.

    2017-06-01

    The urgency of the task of analyzing the foodstuffs quality is determined by the strategy for the formation of a healthy lifestyle and the rational nutrition of the world population. This applies to products, such as chicken eggs. In particular, it is necessary to control the chicken eggs quality at the farm production prior to incubation in order to eliminate the possible hereditary diseases, as well as high embryonic mortality and a sharp decrease in the quality of the bred young. Up to this day, in the market there are no objective instruments of contactless express quality control as analytical equipment that allow the high-precision quality examination of the chicken eggs, which is determined by the color parameters of the eggshell (color uniformity) and yolk of eggs, and by the presence in the eggshell of various defects (cracks, growths, wrinkles, dirty). All mentioned features are usually evaluated only visually (subjectively) with the help of normalized color standards and ovoscopes. Therefore, this work is devoted to the investigation of the application opportunities of contactless express control method with the help of technical vision to implement the chicken eggs' quality analysis. As a result of the studies, a prototype with the appropriate software was proposed. Experimental studies of this equipment on a representative sample of eggs from chickens of different breeds have been carried out (the total number of analyzed samples exceeds 300 pieces). The correctness of the color analysis was verified by spectrophotometric studies of the surface of the eggshell.

  14. Quality Assurance and Control in Laboratory using Neutron Activation Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Y. S.; Moon, J. H.; Sun, G. M.; Kim, S. H.; Baek, S. Y.; Lim, J. M.; Kim, H. R

    2007-01-15

    In accordance with the increment of international trade associated with the worldwide globalization, the importance of quality assurance and control for the commodity produced from one's own country has been stressed. ISO (International Organization for Standards) defines quality control as 'the operational techniques and activities that are used to fulfill the requirements for quality'. Since 1996, the HANARO research reactor in the Korea Atomic Energy Research Institute has been operated thereafter initial critical operation on April 1995. Neutron activation analysis system and applied techniques which is one of a nuclear analytical technologies using reactor neutrons has been developed for user's supporting and the establishment of the quality system for a measurement and analysis, testing and inspection was implemented successfully. On the basis of the qualified NAA system, the test and measurement of more than 1500 samples which is requested from 30 organizations including industrial companies, universities and institutes carried out in NAA laboratory annually. Moreover, as the goal of mutual recognition agreement (MRA) which can be removed a technical barrier in international trade, the objectivity and the confidence of analytical quality in NAA laboratory became established through the installation of international accreditation system by implementing analytical quality system in accordance with international standards in 2001. The aim of the report was to summarize the technical management of introduction, methods and the results for a quality control and assurance which should be performed in NAA technique using the HANARO research reactor. The report will help building up effective quality control strategy in the future.

  15. Microbiological quality control practices at Australian Radioisotopes

    International Nuclear Information System (INIS)

    Saunders, M.

    1987-01-01

    As a domestic manufacturer of therapeutic substances, Australian Radioisotopes (ARI) must adhere to guidelines set out by the Commonwealth Department of Health in the Code of Good Manufacturing Practices for Therapeutic Goods 1983 (GMP). The GMP gives guidelines for staff training, building requirements, sanitation, documentation and quality control practices. These guidelines form the basis for regular audits performed by officers of the National Biological Standards Laboratories. At Lucas Heights, ARI has combined the principles of the GMP with the overriding precautions introduced for environmental and staff safety and protection. Its policy is to maintain a high level of quality assurance for product identity, purity and sterility and apyrogenicity during all stages of product manufacture

  16. Basic quality control in diagnostic radiology

    International Nuclear Information System (INIS)

    Wikstrom, Erik

    2016-01-01

    Along the route toward regular performance of Quality Control in the Diagnostic Imaging sector there are a number of balances to negotiate: Patient/Staff safety considerations vs Regulatory compliance vs Performance of modern equipment vs Clinic's Productivity. At first glance these ambitions may seem in conflict. The tests performed to meet regulatory requirements may or may not bear any semblance to real clinical measurement scenarios. And the process of collecting the data from the quality assurance tests may induce a system down- time that adversely affects the clinic's overall productivity. Furthermore, the time it takes to complete the analysis of the test data and provide the report required to take the facility back into operation is time wasted for patients waiting for a diagnostic imaging exam

  17. A computerized diagnostic system for nuclear plant control rooms based on statistical quality control

    International Nuclear Information System (INIS)

    Heising, C.D.; Grenzebach, W.S.

    1990-01-01

    In engineering science, statistical quality control techniques have traditionally been applied to control manufacturing processes. An application to commercial nuclear power plant maintenance and control is presented that can greatly improve safety. As a demonstration of such an approach to plant maintenance and control, a specific system is analyzed: the reactor coolant pumps of the St. Lucie Unit 2 nuclear power plant located in Florida. A 30-day history of the four pumps prior to a plant shutdown caused by pump failure and a related fire within the containment was analyzed. Statistical quality control charts of recorded variables were constructed for each pump, which were shown to go out of statistical control many days before the plant trip. The analysis shows that statistical process control methods can be applied as an early warning system capable of identifying significant equipment problems well in advance of traditional control room alarm indicators

  18. Integrated evolutionary computation neural network quality controller for automated systems

    Energy Technology Data Exchange (ETDEWEB)

    Patro, S.; Kolarik, W.J. [Texas Tech Univ., Lubbock, TX (United States). Dept. of Industrial Engineering

    1999-06-01

    With increasing competition in the global market, more and more stringent quality standards and specifications are being demands at lower costs. Manufacturing applications of computing power are becoming more common. The application of neural networks to identification and control of dynamic processes has been discussed. The limitations of using neural networks for control purposes has been pointed out and a different technique, evolutionary computation, has been discussed. The results of identifying and controlling an unstable, dynamic process using evolutionary computation methods has been presented. A framework for an integrated system, using both neural networks and evolutionary computation, has been proposed to identify the process and then control the product quality, in a dynamic, multivariable system, in real-time.

  19. Quality control of the 113Sn-113mIn generator

    International Nuclear Information System (INIS)

    Morin Zorilla, J.; Olive, E.; Isaac, M.; Cruz, J.

    1989-01-01

    Methods for quality control of 113 Sn- 113m In generators are compared and recommended the most convenient to applicate in hospitals and in more specialized quality control laboratories. The quality of 113 Sn- 113m In generator produced by POLATOM (Poland) is also evaluated. The product met the requirements of the International Pharmacopeia

  20. ANALYSIS OF QUALITY COSTS FOR STATISTICA QUALITY CONTROL PLANNING

    Directory of Open Access Journals (Sweden)

    N. Chiadamrong

    2017-12-01

    Full Text Available Quality has become one or the most important force leading to organizational success and company growth in national and international markets. The return-on-investment from strong and effective quality programs is providing excellent profitability results in firms with effective quality strategies. Due to the wide variation in quality results, the search for the genuine keys to success in quality has become a matter of deep concern to management of companies. This paper suggests a way to quantifying quality costs. As a result, the appropriate quality strategies can be adjusted and set to match with each company situation based on the categorization of the quality costs suggested. This outcome can, then, be used as a guideline for manufactures in setting their suitable quality program, which establishes the proper balance between the costs and customer services.

  1. 40 CFR 75.21 - Quality assurance and quality control requirements.

    Science.gov (United States)

    2010-07-01

    ... quality assurance audit or any other audit, the system is out-of-control. The owner or operator shall... 40 Protection of Environment 16 2010-07-01 2010-07-01 false Quality assurance and quality control... assurance and quality control requirements. (a) Continuous emission monitoring systems. The owner or...

  2. Quality control in screening programs for cervical cancer

    International Nuclear Information System (INIS)

    Sarduy Napoles, Miguel

    2012-01-01

    The malignancy of the cervix is one of the few locations avoidable cancers, if detected before it progresses to the infiltration. The most efficient way of early detection is through a screening program to provide women undertaking a regular and quality Pap smear. If this test results abnormal, the program offers easier access to specialized care, effective treatment, and follow-up. The objective of this article is to present usefulness of methods for quality control used in screening programs for cervical cancer to detect their inadequacies. Here are some factors and conditions that must be considered in each of the steps to take, for a cervical cancer screening program to be successful and to meet the objectives proposed in reducing mortality due to this cause. This document contains some useful indexes calculated to ensure quality throughout the process. There should be the measurement of quality throughout the screening process that allows collecting of reliable data as well as correcting deficiencies

  3. Quality control and quality standards for the production of bone allografts in China

    International Nuclear Information System (INIS)

    Sun Shiquan; Li Youchen

    1999-01-01

    There is a rapid progress of tissue banking especially Bone Banking in China, In order to strengthen the control on medical devices, Ministry of Public Health (MPH) issued the 'Regulation on Supervision of Critical Medical Devices, MPH Decree No. 54' in 1997. The SPTB was requested to submit new application for the approval of production and providing of tissue allografts. The needed documents are clinical reports, package insert, quality standards of product, Quality System Regulation (QSR) and audit report. Quality System Regulation document adopted the GMP standard for medical devices of FDA, US (21 CFR 620-1997). SPTB will amend the existed Quality Manual to suit the requirement of QSR. Referring to the AATB Standards, SPTB established 'Technical Standards' for Tissue Banking and was approved by the local government, which will be the supplement of the submitted QSR document. Considering the need of market control, MPH requested to submit a 'Quality Standard of Product' and the method of inspection. SPTB has completed such standards for final inspection of bone products, which includes the test for residual water, microbiology, bone species, colour and structure. In addition, the Tissue Bank has completed standards for in process inspection, which includes residual blood, radiation sterilization, initial bioburden, package leakage and biomechanics. In-process inspection is important for the control of non-conforming final products to assure the safety and efficacy of bone grafts. Methods of in process inspection and final inspection are described and discussed in this paper

  4. USE OF INTELLECTUAL TECHNOLOGIES FOR QUALITY CONTROL OF CURD

    Directory of Open Access Journals (Sweden)

    M. M. Blagoveshchenskaia

    2014-01-01

    Full Text Available Summary. Method of curds quality control, based on neural network model is introduced in the paper. It allows to give fair estimate of final product’s quality without use of professional degustators. Method consists in construction of neural network model to estimate quality of curds by input and output parameters. Hardware software complex of curds taste control is proposed to apply in industry for independent estimate of final product. Operation of neural network model based on usage of artificial neural networks, which is one of directions of artificial intelligence theory. Neural network model consists of several artificial neurons layers, which emulate nerve cells functioning. Feed forward network of MLP type was used in solving of curds taste control problem. Feature of this network is that signals passed from one layer’s neurons to next layer’s neurons only from input layer to output, not the other way. Neural network was trained for its correct operation by selection of optimal synaptic factors. Flow diagram of training algorithm is introduced in the paper. Algorithm of neural network tuning is described in the paper. Author proposed set of recommendations for software-hardware complex deployment. Experiment results show that this taste estimate method based on neural net works simplify a problem of final product control as allow to react to deviations in production process on proper time.

  5. Bioresonance method influencing the egg quality

    International Nuclear Information System (INIS)

    Avakova, A.; Kovalev, Yu.

    2009-01-01

    At 2 poultry yards with capacity of 30 thousand laying hens an experiment was undertaken to study the bioresonance effect on 18-week-old poultry (experimental poultry yard, EPY) to obtain eggs of high biological value by activating the assimilation by poultry of a microelement complex from food. At the EPY hens received a vitamin-mineral complex Lifepac senior (produced in France) treated with electromagnetic radiation. At the control poultry yard (CPY) this method was not used. The first egg collection was conducted from hens at the age of 28 weeks, the second one – at the age of 3-4 weeks and the third one – at the age of 52 weeks. The keeping and feeding conditions at the two poultry yards were the same. The contents of water, protein, fat in the eggs of CPY and EPY were practically the same, but the level of microelements in the EPY eggs was higher than in CPY eggs. It was observed so as to maintain high level of microelements in eggs it is required to a bioresonance effect throughout the egg laying period. So, the level of manganese in eggs of EPY and CPY at week 52 was 0.024 and 0.003 mg%, iron – 3.74 and 1.48 mg%, zinc – 1.23 and 0.87 mf%, copper – 0.078 and 0.069 mg%, respectively. The transition of microelements from food into eggs also was % to the control: iron – 2.55, manganese – 10.0, zinc – 1.44, copper – 1.35, potassium – 1.33, calcium – 1.05, phosphorus – 1.15, sodium – 1.16. Thus, the bioresonance method for keeping laying hens makes it possible to obtain food eggs of the desired chemical composition

  6. Quality control in quantitative computed tomography

    International Nuclear Information System (INIS)

    Jessen, K.A.; Joergensen, J.

    1989-01-01

    Computed tomography (CT) has for several years been an indispensable tool in diagnostic radiology, but it is only recently that extraction of quantitative information from CT images has been of practical clinical value. Only careful control of the scan parameters, and especially the scan geometry, allows useful information to be obtained; and it can be demonstrated by simple phantom measurements how sensitive a CT system can be to variations in size, shape and position of the phantom in the gantry aperture. Significant differences exist between systems that are not manifested in normal control of image quality and general performance tests. Therefore an actual system has to be analysed for its suitability for quantitative use of the images before critical clinical applications are justified. (author)

  7. Software Quality Control at Belle II

    Science.gov (United States)

    Ritter, M.; Kuhr, T.; Hauth, T.; Gebard, T.; Kristof, M.; Pulvermacher, C.; Belle Software Group, II

    2017-10-01

    Over the last seven years the software stack of the next generation B factory experiment Belle II has grown to over one million lines of C++ and Python code, counting only the part included in offline software releases. There are several thousand commits to the central repository by about 100 individual developers per year. To keep a coherent software stack of high quality that it can be sustained and used efficiently for data acquisition, simulation, reconstruction, and analysis over the lifetime of the Belle II experiment is a challenge. A set of tools is employed to monitor the quality of the software and provide fast feedback to the developers. They are integrated in a machinery that is controlled by a buildbot master and automates the quality checks. The tools include different compilers, cppcheck, the clang static analyzer, valgrind memcheck, doxygen, a geometry overlap checker, a check for missing or extra library links, unit tests, steering file level tests, a sophisticated high-level validation suite, and an issue tracker. The technological development infrastructure is complemented by organizational means to coordinate the development.

  8. Quality Control in Diagnostic Radiology in the Netherlands (invited paper)

    International Nuclear Information System (INIS)

    Zoetelief, J.

    1998-01-01

    Application of the general principles of radiation protection to medical diagnostic radiology implies that each procedure using X rays or radionuclides is to be justified and optimised. Optimisation in diagnostic radiology implies that the radiation burden to the patient should be as low as possible, but compatible with the image quality necessary to obtain an adequate diagnosis or to guide treatment. Quality control of equipment is a prerequisite for achieving optimisation in diagnostic radiology. This was especially recognised for mammography as employed for breast cancer screening. Existing legislation in the Netherlands includes only a few criteria for equipment used in diagnostic radiology. In addition, the criteria are not all operational and measurement methods are lacking. Therefore, upon the initiative of the Dutch Ministry of Health, Welfare and Sports, the relevant professional societies, in collaboration with the former TNO Centre for Radiological Protection and Dosimetry, formulated eleven guidelines for quality control of equipment used in diagnostic radiology, including test procedures, test frequencies and limiting values. The implementation of quality control of equipment was included in the 1984 European Directive (84/466/Euratom) laying down basic measures for the radiation protection of persons undergoing medical examination or treatment. In the most recent European Directive on medical exposure (97/43/Euratom) the importance of quality control is stressed. In addition, the latter EC directive proposes the use of diagnostic reference levels for limiting the risks for patients undergoing diagnostic radiology. In the Netherlands preliminary reference levels for various procedures employed in diagnostic radiology are suggested. Finally, methods applied in the Netherlands for assessment of image quality are discussed. (author)

  9. Evaluation of a clinically intuitive quality assurance method

    International Nuclear Information System (INIS)

    Norris, H; Thomas, A; Oldham, M

    2013-01-01

    There is a pressing need for clinically intuitive quality assurance methods that report metrics of relevance to the likely impact on tumor control of normal tissue injury. This paper presents a preliminary investigation into the accuracy of a novel ''transform method'' which enables a clinically relevant analysis through dose-volume-histograms (DVHs) and dose overlays on the patient's CT data. The transform method was tested by inducing a series of known mechanical and delivery errors onto simulated 3D dosimetry measurements of six different head-and-neck IMRT treatment plans. Accuracy was then examined through the comparison of the transformed patient dose distributions and the known actual patient dose distributions through dose-volume histograms and normalized dose difference analysis. Through these metrics, the transform method was found to be highly accurate in predicting measured patient dose distributions for these types of errors.

  10. Quality control of nuclear medicine instruments

    International Nuclear Information System (INIS)

    1984-11-01

    This document, which gives detailed guidance on the quality control of the various electronic instruments used for radiation detection and measurement in nuclear medicine, stems from the work of two Advisory Groups convened by the International Atomic Energy Agency (IAEA). A preliminary document, including recommended test schedules but lacking actual protocols for the tests, was drawn up by the first of these groups, meeting at the IAEA Headquarters in Vienna in 1979. A revised and extended version, incorporating recommended test protocols, was prepared by the second Group, meeting likewise in Vienna in 1982. This version is the model for the present text. The document should be of value to all nuclear medicine units, and especially to those in developing countries, in the initiation or revision of schemes for the quality control of their instruments. Its recommendations have provided the basis for instruction in two IAEA regional technical co-operation projects in the subject field, one initiated in 1981 for countries of Latin America and one initiated in 1982 for countries of Asia and the Pacific

  11. Toward standardising gamma camera quality control procedures

    International Nuclear Information System (INIS)

    Alkhorayef, M.A.; Alnaaimi, M.A.; Alduaij, M.A.; Mohamed, M.O.; Ibahim, S.Y.; Alkandari, F.A.; Bradley, D.A.

    2015-01-01

    Attaining high standards of efficiency and reliability in the practice of nuclear medicine requires appropriate quality control (QC) programs. For instance, the regular evaluation and comparison of extrinsic and intrinsic flood-field uniformity enables the quick correction of many gamma camera problems. Whereas QC tests for uniformity are usually performed by exposing the gamma camera crystal to a uniform flux of gamma radiation from a source of known activity, such protocols can vary significantly. Thus, there is a need for optimization and standardization, in part to allow direct comparison between gamma cameras from different vendors. In the present study, intrinsic uniformity was examined as a function of source distance, source activity, source volume and number of counts. The extrinsic uniformity and spatial resolution were also examined. Proper standard QC procedures need to be implemented because of the continual development of nuclear medicine imaging technology and the rapid expansion and increasing complexity of hybrid imaging system data. The present work seeks to promote a set of standard testing procedures to contribute to the delivery of safe and effective nuclear medicine services. - Highlights: • Optimal parameters for quality control of the gamma camera are proposed. • For extrinsic and intrinsic uniformity a minimum of 15,000 counts is recommended. • For intrinsic flood uniformity the activity should not exceed 100 µCi (3.7 MBq). • For intrinsic uniformity the source to detector distance should be at least 60 cm. • The bar phantom measurement must be performed with at least 15 million counts.

  12. Performance and quality control of scintillation cameras

    International Nuclear Information System (INIS)

    Moretti, J.L.; Iachetti, D.

    1983-01-01

    Acceptance testing, quality and control assurance of gamma-cameras are a part of diagnostic quality in clinical practice. Several parameters are required to achieve a good diagnostic reliability: intrinsic spatial resolution, spatial linearity, uniformities, energy resolution, count-rate characteristics, multiple window spatial analysis. Each parameter was measured and also estimated by a test easy to implement in routine practice. Material required was a 4028 multichannel analyzer linked to a microcomputeur, mini-computers and a set of phantoms (parallel slits, diffusing phantom, orthogonal hole transmission pattern). Gamma-cameras on study were:CGR 3400, CGR 3420, G.E.4000. Siemens ZLC 75 and large field Philips. Several tests proposed by N.E.M.A. and W.H.O. have to be improved concerning too punctual spatial determinations during distortion measurements with multiple window. Contrast control of image need to be monitored with high counting rate. This study shows the need to avoid punctual determinations and the interest to give sets of values of the same parameter on the whole field and to report mean values with their standard variation [fr

  13. standards used for quality control of nuclear fuels

    International Nuclear Information System (INIS)

    Guereli, L; Can, S.

    1997-01-01

    Nuclear fuels and fuel materials are subject to stringent restrictions as to their quality. The standards and regulations that apply vary according to reactor type and country and the standards are stated in the quality assurance documents. The concept of quality assurance has altered the conventional quality control tests and procedures, defining which control tests are to be applied and how. Although most of the tests and measurements allow the determination of tolerances to be decided according to the agreement between the buyer and the seller, exacting procedures apply to which instruments and equipment are used for these tests and measurements, how these instruments are standardized.Detailed explanations of test methods and their documentation is a requirement in all standards. The purpose of this work is to study which standards, tests and measurements apply to the nuclear fuel production. Only the standards that apply to various stages of the nuclear fuel production (powder preparation, pellet production, fuel element and fuel assembly fabrication) are reviewed. Process and documentation control, design and licensing requirements and the frequency of inspections are quality assurance subjects. Some ASTM standards are given as examples

  14. 7 CFR 58.141 - Alternate quality control program.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Alternate quality control program. 58.141 Section 58... Service 1 Quality Specifications for Raw Milk § 58.141 Alternate quality control program. When a plant has in operation an acceptable quality program, at the producer level, which is approved by the...

  15. X-ray Spectroscopy for Quality Control of Chemotherapy Drugs

    International Nuclear Information System (INIS)

    Greaves, E. D.; Barros, H.; Bermudez, J.; Sajo-Bohus, L.; Angeli-Greaves, M.

    2007-01-01

    We develop a method, employing Compton peak standardization and the use of matrix-matched spiked samples with Total Reflection X-ray Fluorescence (TXRF), for the determination of platinum plasma concentrations of patients undergoing chemotherapy with Pt-bearing drugs. Direct blood plasma analysis attains Pt detection limits of 70 ng/ml. Measurement results of prescribed drug doses are compared to achieved blood Pt concentrations indicating a lack of expected correlations. Direct analysis of Pt-containing infused drugs from a variety of suppliers indicates cases of abnormal concentrations which raises quality control issues. We demonstrate the potential usefulness of the method for pharmacokinetic studies or for routine optimization and quality control of Pt chemotherapy treatments

  16. Technology requirement for Halal quality control | Husny | Journal of ...

    African Journals Online (AJOL)

    Technology requirement for Halal quality control. ... Findings show that each industry segments have different technology characteristics preference. ... Keywords: halal industry, quality control; technology assistance; food and beverage; ...

  17. The CEA contribution to quality control

    International Nuclear Information System (INIS)

    Rapin, M.; Colomer, J.

    1979-01-01

    The Commissariat a l'Energie Atomique has developed original methods and techniques for testing delicate components of the primary circuit of pressure water reactors. These techniques make use of a very wide range of non destructive testing methods: Eddy currents, particularly multiple frequencies, for testing steam generator tubes, gudgeon and other pins focused ultrasonics for testing all the welds of the reactor vessel and its cover plate, mixed welds of steam vessels and generators, low welds of the pressurizer and gudgeon pins from the inside. On site use is effected with specific machines intended either for inspecting the tube bundles of steam generators under the responsibility of INTERCONTROLE Co., or for the complete examination of the reactor vessel by mixed CEA/INTERCONTROLE crews under the responsibility of the CEA. All these operations are subjected to a programme of quality assurance that provides the guaranty of execution complying with the procedures in force [fr

  18. Quality control and disinfestation of spices for export

    International Nuclear Information System (INIS)

    George, C.K.

    1998-01-01

    India is the largest producer, consumer and exporter of spices in the world. Other than a few, all spices are grown in this country. The production is estimated at 2.6 million tonnes with an export of about 0.22 million tonnes valued around US $ 333 million. India's share in the world trade is over 40 % in quantity and 20 % in value. Many spices produced in India face quality problems as in other countries. For identifying quality produce, grade specifications have been introduced for all the important spices. With the liberalization of government controls, compulsory pre-shipment inspection has been withdrawn unless insisted by the buyer abroad. To meet the sanitary and phytosanitary requirements, the Spices Board has taken up a massive programme for upgradation of quality of Indian spices. Logo mark and Spice House Certificates are awarded to those spice exporting units having necessary infrastructure for assuring quality. By now, 6 units have been accredited to ISO 9000. Though different chemical and non-chemical treatments are available for improving hygienic quality, irradiation appears to be a reliable method. However, its wide application in the spice industry depends upon the conviction of the consumers of its safety. Because of the comprehensive programmes taken up for quality improvement of spices, India is confident of exporting spices meeting quality specifications prescribed by the importing countries. (author)

  19. Measuring and controlling method for organic impurities

    International Nuclear Information System (INIS)

    Aizawa, Motohiro; Igarashi, Hiroo

    1995-01-01

    The present invention concerns measurement and control for organic impurities contained in ultrapurified water for use in a nuclear power plant. A specimen containing organic impurities leached out of anionic exchange resins and cationic exchange resins is introduced to an organic material decomposing section to decompose organic impurities into organic carbon and other decomposed products. Sulfate ions, nitrate ions, nitrite ions and carbon dioxide are produced by the decomposition of the organic impurities. As a next step, carbon dioxide in the decomposed products is separated by deaerating with a nitrogen gas or an argon gas and then a TOC concentration is measured by a non-dispersion-type infrared spectrometer. Further, a specimen from which carbon dioxide was separated is introduced to a column filled with ion exchange resins and, after concentrating inorganic ion impurities, the inorganic ion impurities are identified by using a measuring theory of an ion chromatographic method of eluting and separating inorganic ion impurities and detecting them based on the change of electroconductivity depending on the kinds of the inorganic ion impurities. Organic impurities can be measured and controlled, to improve the reliability of water quality control. (N.H.)

  20. Quality assurance and halal control points for the food industry

    OpenAIRE

    Lau, An Nee; Jamaludin, Mohd Hafiz; Soon, Jan Mei

    2016-01-01

    Purpose\\ud To determine the understanding of halal concept among food production workers and to develop a generic Halal Control Point (HCP) Plan for the manufacturing of processed foods.\\ud \\ud Design/methodology/approach\\ud A mixed method (interviews, surveys and microbiological analyses) approach was used to analyze the hygiene and halal practices of four food processing plants in Penang, Malaysia. Two hundred food production workers were surveyed (and quality assurance staff were interview...

  1. Quality control procedures on graphite, pyrocarbon and silconcarbide

    Energy Technology Data Exchange (ETDEWEB)

    Koizlik, K. [comp.

    1974-09-01

    The presented report includes those papers presented at the 8th meeting of the DP-QCWP in Winfrith which have been written by collaborators of the Institut fuer Reaktorwerkstoffe der Kernforschungsanlage Juelich, together with other co-authors. The papers deal with problems of standardizing characterization methods for the routine quality control of graphites and pyrolytic carbons as well as with more basic procedures (transmission electron microscopy, microporosity) for the analysis of pyrocarbon structure.

  2. Random Forest Application for NEXRAD Radar Data Quality Control

    Science.gov (United States)

    Keem, M.; Seo, B. C.; Krajewski, W. F.

    2017-12-01

    Identification and elimination of non-meteorological radar echoes (e.g., returns from ground, wind turbines, and biological targets) are the basic data quality control steps before radar data use in quantitative applications (e.g., precipitation estimation). Although WSR-88Ds' recent upgrade to dual-polarization has enhanced this quality control and echo classification, there are still challenges to detect some non-meteorological echoes that show precipitation-like characteristics (e.g., wind turbine or anomalous propagation clutter embedded in rain). With this in mind, a new quality control method using Random Forest is proposed in this study. This classification algorithm is known to produce reliable results with less uncertainty. The method introduces randomness into sampling and feature selections and integrates consequent multiple decision trees. The multidimensional structure of the trees can characterize the statistical interactions of involved multiple features in complex situations. The authors explore the performance of Random Forest method for NEXRAD radar data quality control. Training datasets are selected using several clear cases of precipitation and non-precipitation (but with some non-meteorological echoes). The model is structured using available candidate features (from the NEXRAD data) such as horizontal reflectivity, differential reflectivity, differential phase shift, copolar correlation coefficient, and their horizontal textures (e.g., local standard deviation). The influence of each feature on classification results are quantified by variable importance measures that are automatically estimated by the Random Forest algorithm. Therefore, the number and types of features in the final forest can be examined based on the classification accuracy. The authors demonstrate the capability of the proposed approach using several cases ranging from distinct to complex rain/no-rain events and compare the performance with the existing algorithms (e

  3. Managing Air Quality - Control Strategies to Achieve Air Pollution Reduction

    Science.gov (United States)

    Considerations in designing an effective control strategy related to air quality, controlling pollution sources, need for regional or national controls, steps to developing a control strategy, and additional EPA resources.

  4. 10 CFR 26.137 - Quality assurance and quality control.

    Science.gov (United States)

    2010-01-01

    ... cutoff concentration for the compound of interest, a control without the compound of interest (i.e., a certified negative control), and a control with at least one of the compounds of interest at a measurable... calibrator, a control without the compound of interest (i.e., a certified negative control), and a control...

  5. Quality; Research of method; Consumer of satisfaction

    Directory of Open Access Journals (Sweden)

    Altamir da Silva Souza

    2004-01-01

    Full Text Available The customers' evaluation is an indicator used by the concerned organizations with the quality services. Starting from a research of evaluation of the quality services of a company of public cleaning, accomplished the denizen close to, we decided to elaborate this paper to present the found results and a critical analysis of the methodology used by the company. The research outcomes indicate a positive evaluation of the services. However, some changes are suggested on the adopted procedures.

  6. Application of Nemerow Index Method and Integrated Water Quality Index Method in Water Quality Assessment of Zhangze Reservoir

    Science.gov (United States)

    Zhang, Qian; Feng, Minquan; Hao, Xiaoyan

    2018-03-01

    [Objective] Based on the water quality historical data from the Zhangze Reservoir from the last five years, the water quality was assessed by the integrated water quality identification index method and the Nemerow pollution index method. The results of different evaluation methods were analyzed and compared and the characteristics of each method were identified.[Methods] The suitability of the water quality assessment methods were compared and analyzed, based on these results.[Results] the water quality tended to decrease over time with 2016 being the year with the worst water quality. The sections with the worst water quality were the southern and northern sections.[Conclusion] The results produced by the traditional Nemerow index method fluctuated greatly in each section of water quality monitoring and therefore could not effectively reveal the trend of water quality at each section. The combination of qualitative and quantitative measures of the comprehensive pollution index identification method meant it could evaluate the degree of water pollution as well as determine that the river water was black and odorous. However, the evaluation results showed that the water pollution was relatively low.The results from the improved Nemerow index evaluation were better as the single indicators and evaluation results are in strong agreement; therefore the method is able to objectively reflect the water quality of each water quality monitoring section and is more suitable for the water quality evaluation of the reservoir.

  7. The method of quality marker research and quality evaluation of traditional Chinese medicine based on drug properties and effect characteristics.

    Science.gov (United States)

    Zhang, Tiejun; Bai, Gang; Han, Yanqi; Xu, Jun; Gong, Suxiao; Li, Yazhuo; Zhang, Hongbing; Liu, Changxiao

    2018-05-15

    Quality of traditional Chinese medicine (TCM) plays a critical role in industry of TCM. Rapid development of TCM pharmaceutical areas is, however, greatly limited, since there are many issues not been resolved, concerning the quality study of TCM. Core concept of TCM quality as well as the characteristics of TCM was discussed, in order to guide the quality research and evaluation of TCM, further improve the level of TCM quality control. In this review, on the basis of systematic analysis of fundamental property and features of TCM in clinical application, the approaches and methods of quality marker (Q-marker) study were proposed through combination of transitivity and traceability of essentials of quality, correlation between chemical ingredients and drug property/efficacy, as well as analysis of endemicity of ingredients sharing similar pharmacophylogenetic and biosynthetic approaches. The approaches and methods of Q-marker study were proposed and the novel integrated pattern for quality assessment and control of TCM was established. The core concept of Q-marker has helped to break through the bottleneck of the current fragmented quality research of TCM and improved the scientificity, integrity and systematicness of quality control. Copyright © 2018 Elsevier GmbH. All rights reserved.

  8. 14 CFR 21.147 - Changes in quality control system.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Changes in quality control system. 21.147 Section 21.147 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... quality control system. After the issue of a production certificate, each change to the quality control...

  9. 14 CFR 145.211 - Quality control system.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Quality control system. 145.211 Section 145...) SCHOOLS AND OTHER CERTIFICATED AGENCIES REPAIR STATIONS Operating Rules § 145.211 Quality control system. (a) A certificated repair station must establish and maintain a quality control system acceptable to...

  10. 7 CFR 58.523 - Laboratory and quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Laboratory and quality control tests. 58.523 Section... Service 1 Operations and Operating Procedures § 58.523 Laboratory and quality control tests. (a) Quality control tests shall be made on samples as often as necessary to determine the shelf-life and stability of...

  11. 18 CFR 12.40 - Quality control programs.

    Science.gov (United States)

    2010-04-01

    ... 18 Conservation of Power and Water Resources 1 2010-04-01 2010-04-01 false Quality control... PROJECT WORKS Other Responsibilities of Applicant or Licensee § 12.40 Quality control programs. (a... meeting any requirements or standards set by the Regional Engineer. If a quality control program is...

  12. 21 CFR 640.56 - Quality control test for potency.

    Science.gov (United States)

    2010-04-01

    ... quality control test for potency may be performed by a clinical laboratory which meets the standards of... 21 Food and Drugs 7 2010-04-01 2010-04-01 false Quality control test for potency. 640.56 Section...) BIOLOGICS ADDITIONAL STANDARDS FOR HUMAN BLOOD AND BLOOD PRODUCTS Cryoprecipitate § 640.56 Quality control...

  13. Genetic quality control in mass-reared melon flies

    International Nuclear Information System (INIS)

    Miyatake, T.

    2002-01-01

    Quality control in mass-reared melon flies, Bactrocera cucurbitae, after eradication is discussed, based on the results of artificial selection experiments. First, a brief history of quality control in mass-rearing of insects is described. In practical mass- rearing of melon fly, many traits have already been differentiated between mass-reared and wild flies. These differing traits are reviewed and the factors which caused these differences are considered. It was considered that the differences between wild and mass-reared melon flies depended on the selection pressures from the mass-rearing method. Next, the results of several artificial selection experiments using the melon fly are reviewed. Finally, consideration is given to some correlated responses to artificial selection in mass-rearing. Longevity that is correlated to early fecundity was successfully controlled by artificial selection for reproduction in the mass-rearing system. On the basis of these results, an improved method for quality control in mass-reared melon fly with considerations for quantitative genetics is discussed

  14. The development of water quality methods within ecological ...

    African Journals Online (AJOL)

    The development of water quality methods within ecological Reserve ... Water Act (NWA, No 36 of 1998), the ecological Reserve is defined as the quality and quantity ... provide ecologically important flow-related habitat, or geomorphological ...

  15. Physico-chemical quality control 131I-sodium 2-iodohippurate

    International Nuclear Information System (INIS)

    Morin, J.; Olive, E.; Issac, M.; Cruz, J.

    1992-01-01

    Some physico-chemical methods for analytical control 131 I-sodium 2-iodohippurate are compared. The most convenient to applicate in hospital and in more especialized quality control laboratories are recommended

  16. Aggregative Learning Method and Its Application for Communication Quality Evaluation

    Science.gov (United States)

    Akhmetov, Dauren F.; Kotaki, Minoru

    2007-12-01

    In this paper, so-called Aggregative Learning Method (ALM) is proposed to improve and simplify the learning and classification abilities of different data processing systems. It provides a universal basis for design and analysis of mathematical models of wide class. A procedure was elaborated for time series model reconstruction and analysis for linear and nonlinear cases. Data approximation accuracy (during learning phase) and data classification quality (during recall phase) are estimated from introduced statistic parameters. The validity and efficiency of the proposed approach have been demonstrated through its application for monitoring of wireless communication quality, namely, for Fixed Wireless Access (FWA) system. Low memory and computation resources were shown to be needed for the procedure realization, especially for data classification (recall) stage. Characterized with high computational efficiency and simple decision making procedure, the derived approaches can be useful for simple and reliable real-time surveillance and control system design.

  17. Analysis and Comparison of Objective Methods for Image Quality Assessment

    Directory of Open Access Journals (Sweden)

    P. S. Babkin

    2014-01-01

    Full Text Available The purpose of this work is research and modification of the reference objective methods for image quality assessment. The ultimate goal is to obtain a modification of formal assessments that more closely corresponds to the subjective expert estimates (MOS.In considering the formal reference objective methods for image quality assessment we used the results of other authors, which offer results and comparative analyzes of the most effective algorithms. Based on these investigations we have chosen two of the most successful algorithm for which was made a further analysis in the MATLAB 7.8 R 2009 a (PQS and MSSSIM. The publication focuses on the features of the algorithms, which have great importance in practical implementation, but are insufficiently covered in the publications by other authors.In the implemented modification of the algorithm PQS boundary detector Kirsch was replaced by the boundary detector Canny. Further experiments were carried out according to the method of the ITU-R VT.500-13 (01/2012 using monochrome images treated with different types of filters (should be emphasized that an objective assessment of image quality PQS is applicable only to monochrome images. Images were obtained with a thermal imaging surveillance system. The experimental results proved the effectiveness of this modification.In the specialized literature in the field of formal to evaluation methods pictures, this type of modification was not mentioned.The method described in the publication can be applied to various practical implementations of digital image processing.Advisability and effectiveness of using the modified method of PQS to assess the structural differences between the images are shown in the article and this will be used in solving the problems of identification and automatic control.

  18. Ensuring Control Processes Quality in Relay System Without Speed Sensor

    Directory of Open Access Journals (Sweden)

    R. P. Simonyants

    2014-01-01

    Full Text Available The paper considers topical issues of constructing relay systems to control spacecraft attitude and stabilization with no speed sensors (SS owing to use of internal feedback (IF. To research this system by point methods, e.g. a point mapping method, is difficult because of the need to solve the transcendent equations containing parameters both of control object and of IF. We propose the “diagram of superimpositions" (DS method based on topological transformations of the phase space and introduction of a relative time, which enables us to solve engineering problems in analysis and synthesis effectively.The concept of the method is based on the assertion that there is an unambiguous dependence between quality of dynamical regimes in the control system and characteristics of IF transition function. To justify the method a simplified mathematical model of spacecraft motion is applied. The following conditions are accepted: perturbations can be neglected; when the control function is activated, the signal of IF is equal to zero. To the phase surfaces are applied topological symmetry transformations, alignment and projection onto the plane with one of its coordinates being the relative time.The paper gives specific examples of systems with aperiodic feedback (AF for two versions of parameters to satisfy the requirements: I – in quality of self-oscillation mode (by pulse width in the limit cycle; II – in quality of transition process (lack of sliding modes. It is shown that the requirements II and I are contradictory for the system with AF while the sliding modes are unacceptable.It is shown that DS can be used to synthesize the IF to meet requirements of both steady and transient processes consistently. Using the IF it is possible to implement the shutdown laws of the control action on the DS without SS, the same as in case of using the SS. It is shown that in sliding modes transient processes poor in quality can be completely eliminated by

  19. Incorporating Quality Control Information in the Sensor Web

    Science.gov (United States)

    Devaraju, Anusuriya; Kunkel, Ralf; Bogena, Heye

    2013-04-01

    The rapid development of sensing technologies had led to the creation of large amounts of heterogeneous environmental observations. The Sensor Web provides a wider access to sensors and observations via common protocols and specifications. Observations typically go through several levels of quality control, and aggregation before they are made available to end-users. Raw data are usually inspected, and related quality flags are assigned. Data are gap-filled, and errors are removed. New data series may also be derived from one or more corrected data sets. Until now, it is unclear how these kinds of information can be captured in the Sensor Web Enablement (SWE) framework. Apart from the quality measures (e.g., accuracy, precision, tolerance, or confidence), the levels of observational series, the changes applied, and the methods involved must be specified. It is important that this kind of quality control information is well described and communicated to end-users to allow for a better usage and interpretation of data products. In this paper, we describe how quality control information can be incorporated into the SWE framework. Concerning this, first, we introduce the TERENO (TERrestrial ENvironmental Observatories), an initiative funded by the large research infrastructure program of the Helmholtz Association in Germany. The main goal of the initiative is to facilitate the study of long-term effects of climate and land use changes. The TERENO Online Data RepOsitORry (TEODOOR) is a software infrastructure that supports acquisition, provision, and management of observations within TERENO via SWE specifications and several other OGC web services. Next, we specify changes made to the existing observational data model to incorporate quality control information. Here, we describe the underlying TERENO data policy in terms of provision and maintenance issues. We present data levels, and their implementation within TEODOOR. The data levels are adapted from those used by

  20. Quality control of ATLAS muon chambers

    CERN Document Server

    Fabich, Adrian

    ATLAS is a general-purpose experiment for the future Large Hadron Collider (LHC) at CERN. Its Muon Spectrometer will require ∼ 5500m2 of precision tracking chambers to measure the muon tracks along a spectrometer arm of 5m to 15m length, embedded in a magnetic field of ∼ 0.5T. The precision tracking devices in the Muon System will be high pressure drift tubes (MDTs). Approximately 370,000 MDTs will be assembled into ∼ 1200 drift chambers. The performance of the MDT chambers is very much dependent on the mechanical quality of the chambers. The uniformity and stability of the performance can only be assured providing very high quality control during production. Gas tightness, high-voltage behaviour and dark currents are global parameters which are common to gas detectors. For all chambers, they will be tested immediately after the chamber assembly at every production site. Functional tests, for example radioactive source scans and cosmic-ray runs, will be performed in order to establish detailed performan...

  1. Acceptance, commissioning and quality control in radiosurgery

    International Nuclear Information System (INIS)

    Toreti, Dalila Luzia

    2009-01-01

    Stereotactic Radiosurgery is a treatment technique that uses narrow beams of radiation focused with great accuracy in a small lesion. The introduction of micro multi leaf collimators (mMLC) allows this technique to reach a higher degree of dose conformation of the target lesion allowing a smaller irradiation of critical structures and normal tissues. This paper presents the results of the acceptance tests and commissioning of a Varian 6EX linear accelerator dedicated to radiosurgery associated with the BrainLab micro multi leaf collimator installed in the Hospital das Clinicas da Faculdade de Medicina da USP (HC-FMUSP) and establish feasible quality assurance program for the services that employ this special technique. The results of the acceptance tests were satisfactory and are willing with the specifications provided by the manufacturer and the commissioning tests were within the international recommendations. The tests and measures that are part of quality control process should be specific to each treatment unit, and the need, frequency and levels of tolerance

  2. Quality control in nuclear fuel fabrication

    International Nuclear Information System (INIS)

    Abdelhalim, A.S.; Elsayed, A.A.; Shaaban, H.I.

    1988-01-01

    The department of metallurgy, NRC Inchass is embarking on a programme of on a laboratory scale, fuel pins containing uranium dioxide pellets are going to be produced. The department is making use of the expertise and equipment at present available and is going to utilize the new fuel pin fabrication unit which would be shortly in operation. The fabrication and testing of uranium dioxide pellets then gradually adapt them and develop, a national know how in this field. This would also involve building up of indigenous experience through proper training of qualified personnel. That are applied to ensure quality of U o 2 pellets, the techniques implemented, the equipment used and the specifications of the equipment presently available. The following parameters are subject to quality control tests: density. O/U ration, hydrogen content, microstructure, each property will be discussed, measurements related to U o 2 powders, including flow ability, bulk density, O/U ratio, bet surface area and water content will be critically discussed. Relevant tests to ensure Q C of pellets are reviewed. These include surface integrity, density, dimensions, microstructure.4 fig., 1 tab

  3. Tools for quality control of fingerprint databases

    Science.gov (United States)

    Swann, B. Scott; Libert, John M.; Lepley, Margaret A.

    2010-04-01

    Integrity of fingerprint data is essential to biometric and forensic applications. Accordingly, the FBI's Criminal Justice Information Services (CJIS) Division has sponsored development of software tools to facilitate quality control functions relative to maintaining its fingerprint data assets inherent to the Integrated Automated Fingerprint Identification System (IAFIS) and Next Generation Identification (NGI). This paper provides an introduction of two such tools. The first FBI-sponsored tool was developed by the National Institute of Standards and Technology (NIST) and examines and detects the spectral signature of the ridge-flow structure characteristic of friction ridge skin. The Spectral Image Validation/Verification (SIVV) utility differentiates fingerprints from non-fingerprints, including blank frames or segmentation failures erroneously included in data; provides a "first look" at image quality; and can identify anomalies in sample rates of scanned images. The SIVV utility might detect errors in individual 10-print fingerprints inaccurately segmented from the flat, multi-finger image acquired by one of the automated collection systems increasing in availability and usage. In such cases, the lost fingerprint can be recovered by re-segmentation from the now compressed multi-finger image record. The second FBI-sponsored tool, CropCoeff was developed by MITRE and thoroughly tested via NIST. CropCoeff enables cropping of the replacement single print directly from the compressed data file, thus avoiding decompression and recompression of images that might degrade fingerprint features necessary for matching.

  4. Facing a Problem of Electrical Energy Quality in Ship Networks-measurements, Estimation, Control

    Institute of Scientific and Technical Information of China (English)

    Tomasz Tarasiuk; Janusz Mindykowski; Xiaoyan Xu

    2003-01-01

    In this paper, electrical energy quality and its indices in ship electric networks are introduced, especially the meaning of electrical energy quality terms in voltage and active and reactive power distribution indices. Then methods of measurement of marine electrical energy indices are introduced in details and a microprocessor measurement-diagnosis system with the function of measurement and control is designed. Afterwards, estimation and control of electrical power quality of marine electrical power networks are introduced. And finally, according to the existing method of measurement and control of electrical power quality in ship power networks, the improvement of relative method is proposed.

  5. Quality control tests for conventional mammography

    International Nuclear Information System (INIS)

    Dawod, Alnazer Ahmed Ibrahim

    2014-12-01

    Mammography is this the test that allows the radiologist to look at images of the inside of the breasts. Mammograms help detect breast cancer early successful treatment of breast cancer depends on that early diagnosis. Breast cancer is a very common condition. About one in every nine women develops breast cancer by the age of eighty. In addition to the clinical examination and self-examination, mammography plays important role in the detection of breast cancer before they become clinically visible tumors. The mammography is the most common test for early detection of breast cancer. Quality control techniques that done ensured importance of this programme to produce images with good diagnostic values and help radiologist to diagnose breast discase easily and avoid exposing patient to radiation hazards.(Author)

  6. Current status of quality evaluation of nursing care through director review and reflection from the Nursing Quality Control Centers

    Science.gov (United States)

    Duan, Xia; Shi, Yan

    2014-01-01

    Background: The quality evaluation of nursing care is a key link in medical quality management. It is important and worth studying for the nursing supervisors to know the disadvantages during the process of quality evaluation of nursing care and then to improve the whole nursing quality. This study was to provide director insight on the current status of quality evaluation of nursing care from Nursing Quality Control Centers (NQCCs). Material and Methods: This qualitative study used a sample of 12 directors from NQCCs who were recruited from 12 provinces in China to evaluate the current status of quality evaluation of nursing care. Data were collected by in-depth interviews. Content analysis method was used to analyze the data. Results: Four themes emerged from the data: 1) lag of evaluation index; 2) limitations of evaluation content; 3) simplicity of evaluation method; 4) excessive emphasis on terminal quality. Conclusion: It is of great realistic significance to ameliorate nursing quality evaluation criteria, modify the evaluation content based on patient needs-oriented idea, adopt scientific evaluation method to evaluate nursing quality, and scientifically and reasonably draw horizontal comparisons of nursing quality between hospitals, as well as longitudinal comparisons of a hospital’s nursing quality. These methods mentioned above can all enhance a hospital’s core competitiveness and benefit more patients. PMID:25419427

  7. The growing need for analytical quality control

    International Nuclear Information System (INIS)

    Suschny, O.; Richman, D.M.

    1974-01-01

    Technological development in a country is directly dependent upon its analytical chemistry or measurement capability, because it is impossible to achieve any level of technological sophistication without the ability to measure. Measurement capability is needed to determine both technological competence and technological consequence. But measurement itself is insufficient. There must be a standard or a reference for comparison. In the complicated world of chemistry the need for reference materials grows with successful technological development. The International Atomic Energy Agency has been distributing calibrated radioisotope solutions, standard reference materials and intercomparison materials since the early 1960's. The purpose of this activity has been to help laboratories in its Member States to assess and, if necessary, to improve the reliability of their analytical work. The value and continued need of this service has been demonstrated by the results of many intercomparisons which proved that without continuing analytical quality control activities, adequate reliability of analytical data could not be taken for granted. Analytical chemistry, lacking the glamour of other aspects of the physical sciences, has not attracted the attention it deserves, but in terms of practical importance, it warrants high priority in any developing technological scheme, because without it there is little chance to evaluate technological success or failure or opportunity to identify the reasons for success or failure. The scope and the size of the future programme of the IAEA in this field has been delineated by recommendations made by several Panels of Experts; all have agreed on the importance of this programme and made detailed recommendations in their areas of expertise. The Agency's resources are limited and it cannot on its own undertake the preparation and distribution of all the materials needed. It can, however, offer a focal point to bring together different

  8. Terms and definitions of quality assurance/quality control

    International Nuclear Information System (INIS)

    Kaden, W.

    1980-01-01

    Terms of quality assurance are defined and interpreted. Reference is made to the IAEA Code of Practice and to other important Codes and Standards like ANSI, ASME and KTA. The relevance of these terms to everyday's work and problems of a quality assurance engineer is explained. (orig.)

  9. Quality assurance and applied statistics. Method 3

    International Nuclear Information System (INIS)

    1992-01-01

    This German-Industry-Standards-paperback contains the International Standards from the Series ISO 9000 (or, as the case may be, the European Standards from the Series EN 29000) concerning quality assurance and including the already completed supplementary guidelines with ISO 9000- and ISO 9004-section numbers, which have been adopted as German Industry Standards and which are observed and applied world-wide to a great extent. It also includes the German-Industry-Standards ISO 10011 parts 1, 2 and 3 concerning the auditing of quality-assurance systems and the German-Industry-Standard ISO 10012 part 1 concerning quality-assurance demands (confirmation system) for measuring devices. The standards also include English and French versions. They are applicable independent of the user's line of industry and thus constitute basic standards. (orig.) [de

  10. [Compatibility of different quality control systems].

    Science.gov (United States)

    Invernizzi, Enrico

    2002-01-01

    Management of the good laboratory practice (GLP) quality system presupposes its linking to a basic recognized and approved quality system, from which it can draw on management procedures common to all quality systems, such as the ISO 9000 set of norms. A quality system organized in this way can also be integrated with other dedicated quality systems, or parts of them, to obtain principles or management procedures for specific topics. The aim of this organization is to set up a reliable, recognized quality system compatible with the principles of GLP and other quality management systems, which provides users with a simplified set of easily accessible management tools and answers. The organization of this quality system is set out in the quality assurance programme, which is actually the document in which the test facility incorporates the GLP principles into its own quality organization.

  11. Quality Control Procedure Based on Partitioning of NMR Time Series

    Directory of Open Access Journals (Sweden)

    Michał Staniszewski

    2018-03-01

    Full Text Available The quality of the magnetic resonance spectroscopy (MRS depends on the stability of magnetic resonance (MR system performance and optimal hardware functioning, which ensure adequate levels of signal-to-noise ratios (SNR as well as good spectral resolution and minimal artifacts in the spectral data. MRS quality control (QC protocols and methodologies are based on phantom measurements that are repeated regularly. In this work, a signal partitioning algorithm based on a dynamic programming (DP method for QC assessment of the spectral data is described. The proposed algorithm allows detection of the change points—the abrupt variations in the time series data. The proposed QC method was tested using the simulated and real phantom data. Simulated data were randomly generated time series distorted by white noise. The real data were taken from the phantom quality control studies of the MRS scanner collected for four and a half years and analyzed by LCModel software. Along with the proposed algorithm, performance of various literature methods was evaluated for the predefined number of change points based on the error values calculated by subtracting the mean values calculated for the periods between the change-points from the original data points. The time series were checked using external software, a set of external methods and the proposed tool, and the obtained results were comparable. The application of dynamic programming in the analysis of the phantom MRS data is a novel approach to QC. The obtained results confirm that the presented change-point-detection tool can be used either for independent analysis of MRS time series (or any other or as a part of quality control.

  12. Application of Pareto's Method in Analysing Postal Service Quality

    Directory of Open Access Journals (Sweden)

    Elizabeta Kovač-Striko

    2012-10-01

    Full Text Available The basic aim of control in postal traffic is to insure high-quality se1vices for customers. The paper presents the analysisof quality control in collecting postal items, based on the dataobtained during the control performed by the internal ControlService in the postal centre for international traffic Zagreb. Thepaper also offers some measures for the improvement of thequality of services.

  13. Requirements for quality control of analytical data

    International Nuclear Information System (INIS)

    Westmoreland, R.D.; Bartling, M.H.

    1990-07-01

    The National Contingency Plan (NCP) of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) provides procedures for the identification, evaluation, and remediation of past hazardous waste disposal sites. The Hazardous Materials Response section of the NCP consists of several phases: Preliminary Assessment, Site Inspection, Remedial Investigation, Feasibility Study, Remedial Design, and Remedial Action. During any of these phases, analysis of soil, water, and waste samples may be performed. The Hazardous Waste Remedial Actions Program (HAZWRAP) is involved in performing field investigations and sample analyses pursuant to the NCP for the US Department of Energy and other federal agencies. The purpose of this document is to specify the requirements of Martin Marietta Energy Systems, Inc., for the control of accuracy, precision, and completeness of samples and data from the point of collection through analysis. Requirements include data reduction and reporting of resulting environmentally related data. Because every instance and concern may not be addressed in this document, HAZWRAP subcontractors are encouraged to discuss any questions with the Analytical Quality Control Specialist (AQCS) and the HAZWRAP Project Manager. This revision supercedes all other versions of this document

  14. Application of propagation calculations in air quality control

    International Nuclear Information System (INIS)

    Kuelske, S.

    1993-01-01

    This paper describes the development of a methodics of propagation calculation since the foundation of the 'Landesanstalt fuer Immissionsschutz' in 1963, and its practical use in air quality control. In this context, it deals with methods for calculating stack heights and the Gaussian propagation model adopted by the Technical Code on Clean Air, the propagation of flue gas emitted via cooling towers, the propagation of accidentally released substances, odours and automobile emissions, and with flow and propagation calculation for the proximity zone of buildings as well as for meteorological fields with space and time variations and topographically varied terrain. (orig.) [de

  15. Advanced Control Methods for Optimization of Arc Welding

    DEFF Research Database (Denmark)

    Thomsen, J. S.

    Gas Metal Arc Welding (GMAW) is a proces used for joining pieces of metal. Probably, the GMAW process is the most successful and widely used welding method in the industry today. A key issue in welding is the quality of the welds produced. The quality of a weld is influenced by several factors...... in the overall welding process; one of these factors are the ability of the welding machine to control the process. The internal control algorithms in GMAW machines are the topic of this PhD project. Basically, the internal control includes an algorithm which is able to keep the electrode at a given distance...

  16. Spectral shift reactor control method

    International Nuclear Information System (INIS)

    Impink, A.J. Jr.

    1981-01-01

    A method of operating a nuclear reactor having a core and coolant displacer elements arranged in the core wherein is established a reator coolant temperature set point at which it is desired to operate said reactor and first reactor coolant temperature band limits are provided within which said set point is located and it is desired to operate said reactor charactrized in that said reactor coolant displacer elements are moved relative to the reactor core for adjusting the volume of reactor coolant in said core as said reactor coolant temperature approaches said first band limits thereby to maintain said reactor coolant temperature near said set point and within said first band limits

  17. Possibilities of obtaining and controlling high-quality pressure castings

    Directory of Open Access Journals (Sweden)

    S. Pietrowski

    2011-07-01

    Full Text Available The paper presents the influence of the type of furnace charging melting, refining and modification silumins 226 and 231 on the porosity and microstructure of castings. It was shown that in order to reduce or eliminate the porosity of the castings is necessary to the refining ECOSAL-AL113 of liquid silumin both in the melting furnace, and in the ladle and an additional nitrogen, in the heat furnace modified and refining with nitrogen. To control the effects of refining and modifying the TDA method was used. It was found that based on crystal- lization curve can be qualitatively assess the gas porosity of the castings. In order to control and quality control silumins author developed a computer program using the method of TDA, which sets out: Rm, A5, HB and casting porosity P and the concentration of hydrogen in them. The program also informs the technological procedures to be performed for liquid silumin improper preparation.

  18. Adaptive Control Methods for Soft Robots

    Data.gov (United States)

    National Aeronautics and Space Administration — I propose to develop methods for soft and inflatable robots that will allow the control system to adapt and change control parameters based on changing conditions...

  19. Chapter 5: Quality assurance/quality control in stormwater sampling

    Science.gov (United States)

    Sampling the quality of stormwater presents unique challenges because stormwater flow is relatively short-lived with drastic variability. Furthermore, storm events often occur with little advance warning, outside conventional work hours, and under adverse weather conditions. Therefore, most stormwat...

  20. Genetic variation at loci controlling quality traits in spring wheat

    International Nuclear Information System (INIS)

    Ali, N.; Iqbal, M.; Asif, M.

    2013-01-01

    Selection for quality traits in bread wheat (Triticum aestivum L.) during early breeding generations requires quick analytical methods that need small grain samples. Marker assisted selection can be useful for the improvement of quality traits in wheat. The present study was conducted to screen 117 Pakistani adapted spring wheat varieties with DNA markers linked with genes controlling composition of low and high molecular weight glutenin subunits (LMW-GS and HMW-GS, respectively), starch viscosity, Polyphenol oxidase (PPO) activity and grain hardness. DNA fragments associated with the presence/absence of quality related genes were amplified using Polymerase chain reaction (PCR) and detected using agarose gel electrophoresis. Positive allele of beta-secalin, which indicates presence of 1B.1R translocation, was found in 77 (66%) varieties. The marker PPO05 was found in 30 (26%) varieties, indicating lower PPO activity. Grain hardness controlled by Pinb-D1b allele was present in 49 (42%) varieties. Allele Wx-B1b which confers superior noodle quality was found in 48 (41%) varieties. HMW-GS encoded by Glu-D1d allele that exerts a positive effect on dough strength was present in 115 (98%) varieties. LMW-GS alleles Glu-A3d and Glu-B3 were observed in 21 (18%) and 76 (65%) varieties, respectively. Results of the present study may help wheat breeders in selecting parents for improving desirable quality attributes of future wheat varieties. The varieties, identified having desirable quality genes, in this study can be used in the wheat breeding programs aiming to improve quality traits. Early generation marker assisted selection can help to efficiently utilize resources of a breeding program. (author)

  1. Ior-CEA-1: Labelling, quality control and clinical evaluation

    International Nuclear Information System (INIS)

    Pimentel, G.J.

    1998-01-01

    Within the Co-ordinated Programme on Labelling, Quality Control and Evaluation of Monoclonal Antibodies, the IAEA has made a great effort to expand efficient labelling methods, mainly those with radioisotopes which have been used for radioimmunoscintigraphy. In this sense, more recently 99 Tc m has been mostly employed in the majority of the investigations due to its ideal physical characteristics. Efficient labelling of monoclonal antibodies depends on a number of factors including the method and way of the label incorporation into the protein. During the last years several direct labelling approaches have been developed, which led to attain simple and inexpensive methods for medical practice, as well as safe and stable techniques which bring accurate and good quality images. Accordingly, this paper describes the results obtained during last five years which come from the comparison among different labelling systems, passing through the quality control to test the labelled monoclonal stability and the protein bioreactivity, to continue in the clinical evaluation of ior-CEA-1, as well as the evaluation of other antibodies. Up to now we have evaluated more than 70 patients with the anti-CEA monoclonal antibody (ior-CEA-1), examined in different clinical assays such as: pilot, phase I-II and extensive phase III-IV trials, whose results are encouraging. It confirms that the employed labelling approach was safe and adequate

  2. REAL TIME QUALITY CONTROL OF THE HEATSET OFFSET PRINTING PROCESS

    Directory of Open Access Journals (Sweden)

    Răzvan-George RĂCHERU

    2016-05-01

    Full Text Available Offset lithography is one of the most common ways of creating printed materials. Compared to other printing methods, offset printing is best suited for economically producing large volumes of high quality prints in a manner that requires little maintenance. Because of the high speed and the high volume of the printing press, we have to rely on automation for press control and not just to the printer’s eye. When printing an image that has more than one color, it is necessary to print each color separately and ensure each color overlaps the others precisely. If this is not done, the finished image will look fuzzy, blurred or "out of register". To help line the colors up correctly, a system of registration is necessary. Therefore, the use of an automated real time quality control system will result in a more consistent color for the customer and less waste for the printer.

  3. Verification and quality control of routine hematology analyzers.

    Science.gov (United States)

    Vis, J Y; Huisman, A

    2016-05-01

    Verification of hematology analyzers (automated blood cell counters) is mandatory before new hematology analyzers may be used in routine clinical care. The verification process consists of several items which comprise among others: precision, accuracy, comparability, carryover, background and linearity throughout the expected range of results. Yet, which standard should be met or which verification limit be used is at the discretion of the laboratory specialist. This paper offers practical guidance on verification and quality control of automated hematology analyzers and provides an expert opinion on the performance standard that should be met by the contemporary generation of hematology analyzers. Therefore (i) the state-of-the-art performance of hematology analyzers for complete blood count parameters is summarized, (ii) considerations, challenges, and pitfalls concerning the development of a verification plan are discussed, (iii) guidance is given regarding the establishment of reference intervals, and (iv) different methods on quality control of hematology analyzers are reviewed. © 2016 John Wiley & Sons Ltd.

  4. Quality control of MC and A system and integrated safeguards

    International Nuclear Information System (INIS)

    Osabe, Takeshi

    2000-01-01

    In the integrated safeguards regime, co-operation with SSAC is a vital element to achieve efficiency of safeguards implementation while maintaining the effectiveness. However, the degree of co-operation fully depends upon the credibility, technical capability and the transparency of SSAC. Since the credibility of SSAC (States' System of Accounting for and Control of Nuclear Materials) depends heavily on effectiveness of facility operator's Material Control and Accounting (MC and A) practice, some measures to provide continuous assurance of the function and effectiveness of the system such as quality assurance program including periodical system audit (diagnostic) function ought to be established. This paper discusses quality assurance program for facility level MC and A including audit (diagnostic) method to maintain continuous assurance of the effectiveness. (author)

  5. Quality control of Cordyceps sinensis, a valued traditional Chinese medicine.

    Science.gov (United States)

    Li, S P; Yang, F Q; Tsim, Karl W K

    2006-08-28

    Cordyceps sinensis, a well-known and valued traditional Chinese medicine, is also called DongChongXiaCao (winter worm summer grass) in Chinese. It is commonly used to replenish the kidney and soothe the lung for the treatment of fatigue, night sweating, hyposexualities, hyperglycemia, hyperlipidemia, asthemia after severe illness, respiratory disease, renal dysfunction and renal failure, arrhythmias and other heart disease, and liver disease. As the rarity and upstanding curative effects of natural Cordyceps, several mycelial strains have been isolated from natural Cordyceps and manufactured in large quantities by fermentation technology, and they are commonly sold as health food products in Asia. In addition, some substitutes such as Cordyceps militaris also have been used and adulterants also confused the market. Therefore, quality control of C. sinensis and its products is very important to ensure their safety and efficacy. Herein, markers and analytical methods for quality control of Cordyceps were reviewed and discussed.

  6. Quality control of the activity meter; Controle de qualidade do ativímetro

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Marlon da Silva Brandão; Sá, Lídia Vasconcelos de, E-mail: nolramsbr@gmail.com [Instituto de Radioproteção e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2017-07-01

    Objective: To carry out a comparative analysis of national and international standards regarding the quality control of the activity meter used in Nuclear Medicine Services in Brazil. Material and methods: Quality control protocols from the International Atomic Energy Agency (IAEA), American Association of Physicists in Medicine (AAPM) and International Electrotechnical Commission (IEC) were pointed out and compared with requirements from both regulatory Brazilian agencies, National Surveillance Agency (ANVISA) and National Nuclear Energy Commission (CNEN). Results: The daily routine tests recommended by the regulatory agencies do not have significant differences; in contrast the tests with higher periodicities like (accuracy, linearity and precision) have differences discrepant. Conclusion: In view of the comparative analysis carried out, it is suggested that the national recommendations for the quality control tests of the activity meter should be checked and evaluated, with emphasis on the semiannual and annual periodicity tests. (author)

  7. Preventive Methods for ATM Mode Control

    OpenAIRE

    Ivan Baronak; Robert Trska

    2004-01-01

    Broadband transfer mode ATM represent one of alternative solutions for growing requirements on transfer capabilities. Its advantage is an effort for provisions of guaranteed quality of transport services with preservations of high transfer rate. This property is covered by several mechanisms, which role is to control not only the traffic of existing connections, but also the admission of new ones and prevent the violation of requirements on transport quality of existing and new connections.

  8. Quality evaluation of resistivity-controlled silicon crystals

    Science.gov (United States)

    Wang, Jong Hoe

    2006-01-01

    The segregation phenomenon of dopants causes a low production yield of silicon crystal that meets the resistivity tolerance required by device manufacturers. In order to control the macroscopic axial resistivity distribution in bulk crystal growth, numerous studies including continuous Czochralski method and double crucible technique have been studied. The simple B-P codoping method for improving the productivity of p-type silicon single-crystal growth by controlling axial specific resistivity distribution was proposed by Wang [Jpn. J. Appl. Phys. 43 (2004) 4079]. In this work, the quality of Czochralski-grown silicon single crystals with a diameter 200 mm using B-P codoping method was studied from the chemical and structural points of view. It was found that the characteristics of B-P codoped wafers including the oxygen precipitation behavior and the grown-in defects are same as that of conventional B-doped Czochralski crystals.

  9. Spectral shift reactor control method

    International Nuclear Information System (INIS)

    Impink, A.J.

    1982-01-01

    A method of operating a nuclear reactor having a core and coolant displacer elements arranged in the core where there is established a reactor coolant temperature set point at which it is desired to operate the reactor and first reactor coolant temperature band limits within which the set point is characterized. The reactor coolant displacer elements are moved relative to the reactor core for adjusting the volume of reactor coolant in the core as the reactor coolant temperature approaches the first band limits to maintain the reactor coolant temperature near the set point and within the first band limits. The reactivity charges associated with movement of respective coolant displacer element clusters is calculated and compared with a calculated derived reactivity charge in order to select the cluster to be moved. (author)

  10. 21 CFR 111.117 - What quality control operations are required for equipment, instruments, and controls?

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 2 2010-04-01 2010-04-01 false What quality control operations are required for equipment, instruments, and controls? 111.117 Section 111.117 Food and Drugs FOOD AND DRUG ADMINISTRATION... and Process Control System: Requirements for Quality Control § 111.117 What quality control operations...

  11. Bypass flow rate control method

    International Nuclear Information System (INIS)

    Kiyama, Yoichi.

    1997-01-01

    In a PWR type reactor, bypass flow rate is controlled by exchanging existent jetting hole plugs of a plurality of nozzles disposed to the upper end of incore structures in order to flow a portion of primary coolants as a bypass flow to the upper portion of the pressure vessel. Two kinds of exchange plugs, namely, a first plug and a second plug each having a jetting out hole of different diameter are used as exchange plugs. The first plug has the diameter as that of an existent plug and the second plug has a jetting out hole having larger diameter than that of the existent plug. Remained extent plugs are exchanged to a combination of the first and the second plugs without exchanging existent plugs having seizing with the nozzles, in which the number and the diameter of the jetting out holes of the second plugs are previously determined based on predetermined total bypass flow rate to be jetted from the entire plugs after exchange of plugs. (N.H.)

  12. An Austrian framework for PET quality control

    International Nuclear Information System (INIS)

    Nicoletti, R.; Dobrozemsky, G.; Minear, G.; Bergmann, H.

    2002-01-01

    Full text: The European patient protection directive (97/43 EURATOM) requires regular routine quality control (QC) of PET imaging devices. Since no standards were available covering this area and in order to comply with the directive a joint working party of the Austrian societies of nuclear medicine and of medical physics have developed a set of procedures suitable for both dedicated PET scanners and gamma cameras operating in coincidence mode (GCPET). The routine procedures proposed include both manufacturer recommended procedures and tests for specific parameters and calibration procedures. Wherever possible, procedures adapted or derived from NEMA standards publication NU 2-2001 were used to permit direct comparison with specified parameters of image quality. For dedicated PET scanners the most important procedures are the checking of detector sensitivities and the attenuation calibration scan. With full ring scanners the attenuation calibration scan is a blank scan, with partial ring devices a special attenuation calibration phantom has to be used. Test protocols are specific to manufacturer and scanner type. They are usually performed automatically overnight. In addition, some instruments require special calibrations, e.g. gain adjustments or coincidence timing calibration. GCPET procedures include the frequent assessment in coincidence mode of detector uniformity, energy resolution and system sensitivity. Common to both dedicated PET and GCPET are the regular quarterly assessment of tomographic spatial resolution and the calibration of the system for quantitative measurements. As a total performance test for both systems assessment of image quality following NU 2-2001 was included, to be carried out after major system changes or repairs. The suite of QC procedures was tested on several dedicated PET and GCPET systems including all major manufacturers' systems. Due to missing hardware or software not all tests could be performed on all systems. Some of the

  13. Cumulative sum quality control for calibrated breast density measurements

    International Nuclear Information System (INIS)

    Heine, John J.; Cao Ke; Beam, Craig

    2009-01-01

    Purpose: Breast density is a significant breast cancer risk factor. Although various methods are used to estimate breast density, there is no standard measurement for this important factor. The authors are developing a breast density standardization method for use in full field digital mammography (FFDM). The approach calibrates for interpatient acquisition technique differences. The calibration produces a normalized breast density pixel value scale. The method relies on first generating a baseline (BL) calibration dataset, which required extensive phantom imaging. Standardizing prospective mammograms with calibration data generated in the past could introduce unanticipated error in the standardized output if the calibration dataset is no longer valid. Methods: Sample points from the BL calibration dataset were imaged approximately biweekly over an extended timeframe. These serial samples were used to evaluate the BL dataset reproducibility and quantify the serial calibration accuracy. The cumulative sum (Cusum) quality control method was used to evaluate the serial sampling. Results: There is considerable drift in the serial sample points from the BL calibration dataset that is x-ray beam dependent. Systematic deviation from the BL dataset caused significant calibration errors. This system drift was not captured with routine system quality control measures. Cusum analysis indicated that the drift is a sign of system wear and eventual x-ray tube failure. Conclusions: The BL calibration dataset must be monitored and periodically updated, when necessary, to account for sustained system variations to maintain the calibration accuracy.

  14. Cumulative sum quality control for calibrated breast density measurements

    Energy Technology Data Exchange (ETDEWEB)

    Heine, John J.; Cao Ke; Beam, Craig [Cancer Prevention and Control Division, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, Florida 33612 (United States); Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, 1603 W. Taylor St., Chicago, Illinois 60612 (United States)

    2009-12-15

    Purpose: Breast density is a significant breast cancer risk factor. Although various methods are used to estimate breast density, there is no standard measurement for this important factor. The authors are developing a breast density standardization method for use in full field digital mammography (FFDM). The approach calibrates for interpatient acquisition technique differences. The calibration produces a normalized breast density pixel value scale. The method relies on first generating a baseline (BL) calibration dataset, which required extensive phantom imaging. Standardizing prospective mammograms with calibration data generated in the past could introduce unanticipated error in the standardized output if the calibration dataset is no longer valid. Methods: Sample points from the BL calibration dataset were imaged approximately biweekly over an extended timeframe. These serial samples were used to evaluate the BL dataset reproducibility and quantify the serial calibration accuracy. The cumulative sum (Cusum) quality control method was used to evaluate the serial sampling. Results: There is considerable drift in the serial sample points from the BL calibration dataset that is x-ray beam dependent. Systematic deviation from the BL dataset caused significant calibration errors. This system drift was not captured with routine system quality control measures. Cusum analysis indicated that the drift is a sign of system wear and eventual x-ray tube failure. Conclusions: The BL calibration dataset must be monitored and periodically updated, when necessary, to account for sustained system variations to maintain the calibration accuracy.

  15. Fuzzy logic control to be conventional method

    Energy Technology Data Exchange (ETDEWEB)

    Eker, Ilyas [University of Gaziantep, Gaziantep (Turkey). Department of Electrical and Electronic Engineering; Torun, Yunis [University of Gaziantep, Gaziantep (Turkey). Technical Vocational School of Higher Education

    2006-03-01

    Increasing demands for flexibility and fast reactions in modern process operation and production methods result in nonlinear system behaviour of partly unknown systems, and this necessitates application of alternative control methods to meet the demands. Fuzzy logic (FL) control can play an important role because knowledge based design rules can easily be implemented in systems with unknown structure, and it is going to be a conventional control method since the control design strategy is simple and practical and is based on linguistic information. Computational complexity is not a limitation any more because the computing power of computers has been significantly improved even for high speed industrial applications. This makes FL control an important alternative method to the conventional PID control method for use in nonlinear industrial systems. This paper presents a practical implementation of the FL control to an electrical drive system. Such drive systems used in industry are composed of masses moving under the action of position and velocity dependent forces. These forces exhibit nonlinear behaviour. For a multi-mass drive system, the nonlinearities, like Coulomb friction and dead zone, significantly influence the operation of the systems. The proposed FL control configuration is based on speed error and change of speed error. The feasibility and effectiveness of the control method are experimentally demonstrated. The results obtained from conventional FL control, fuzzy PID and adaptive FL control are compared with traditional PID control for the dynamic responses of the closed loop drive system. (author)

  16. Fuzzy logic control to be conventional method

    International Nuclear Information System (INIS)

    Eker, Ilyas; Torun, Yunis

    2006-01-01

    Increasing demands for flexibility and fast reactions in modern process operation and production methods result in nonlinear system behaviour of partly unknown systems, and this necessitates application of alternative control methods to meet the demands. Fuzzy logic (FL) control can play an important role because knowledge based design rules can easily be implemented in systems with unknown structure, and it is going to be a conventional control method since the control design strategy is simple and practical and is based on linguistic information. Computational complexity is not a limitation any more because the computing power of computers has been significantly improved even for high speed industrial applications. This makes FL control an important alternative method to the conventional PID control method for use in nonlinear industrial systems. This paper presents a practical implementation of the FL control to an electrical drive system. Such drive systems used in industry are composed of masses moving under the action of position and velocity dependent forces. These forces exhibit nonlinear behaviour. For a multi-mass drive system, the nonlinearities, like Coulomb friction and dead zone, significantly influence the operation of the systems. The proposed FL control configuration is based on speed error and change of speed error. The feasibility and effectiveness of the control method are experimentally demonstrated. The results obtained from conventional FL control, fuzzy PID and adaptive FL control are compared with traditional PID control for the dynamic responses of the closed loop drive system

  17. Control of quality in spectrometry gamma of low level

    CERN Document Server

    Salazar, A

    1997-01-01

    Low level gamma spectrometry is a very precise technique to measure the concentration of nuclides present in different samples in Bq kg sup - sup 1. The quality control of the procedure and method used can be carried out by intercomparison exercises with world recognized institutions. During the last three years the Nuclear Physics Laboratory Of The University of Costa Rica (LAFNA) has been participating in the international quality assessment program (QAP) carried out by the Environmental Measurements Laboratory (EML), department of Energy, USA. The results show a very good agreement with the rest of the participant laboratories. This provides a very objective evaluation of the high precision of the methods used by LAFNA in low level spectroscopy measurements. (Author)

  18. Control of quality in spectrometry gamma of low level

    International Nuclear Information System (INIS)

    Salazar, A.; Loria, G.

    1997-01-01

    Low level gamma spectrometry is a very precise technique to measure the concentration of nuclides present in different samples in Bq kg -1 . The quality control of the procedure and method used can be carried out by intercomparison exercises with world recognized institutions. During the last three years the Nuclear Physics Laboratory Of The University of Costa Rica (LAFNA) has been participating in the international quality assessment program (QAP) carried out by the Environmental Measurements Laboratory (EML), department of Energy, USA. The results show a very good agreement with the rest of the participant laboratories. This provides a very objective evaluation of the high precision of the methods used by LAFNA in low level spectroscopy measurements. (Author) [es

  19. 7 CFR 58.733 - Quality control tests.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Quality control tests. 58.733 Section 58.733... Procedures § 58.733 Quality control tests. (a) Chemical analyses. The following chemical analyses shall be... pasteurization by means of the phosphatase test, as well as any other tests necessary to assure good quality...

  20. Minimal requirements for quality controls in radiotherapy with external beams

    International Nuclear Information System (INIS)

    1999-01-01

    Physical dosimetric guidelines have been developed by the Italian National Institute of Health study group on quality assurance in radiotherapy to define protocols for quality controls in external beam radiotherapy. While the document does not determine strict rules or firm recommendations, it suggests minimal requirements for quality controls necessary to guarantee an adequate degree of accuracy in external beam radiotherapy [it

  1. Performance and quality control of nuclear medicine instrumentation

    International Nuclear Information System (INIS)

    Paras, P.

    1981-01-01

    The status and the recent developments of nuclear medicine instrumentation performance, with an emphasis on gamma-camera performance, are discussed as the basis for quality control. New phantoms and techniques for the measurement of gamma-camera performance parameters are introduced and their usefulness for quality control is discussed. Tests and procedures for dose calibrator quality control are included. Also, the principles of quality control, tests, equipment and procedures for each type of instrument are reviewed, and minimum requirements for an effective quality assurance programme for nuclear medicine instrumentation are suggested. (author)

  2. 10 CFR 26.167 - Quality assurance and quality control.

    Science.gov (United States)

    2010-01-01

    ... at the appropriate cutoff concentration for the compound of interest as specified in § 26.161(c) and (f), a control without the compound of interest (i.e., a certified negative control), and at least one control with one of the compounds of interest at a measurable concentration; and (ii) A...

  3. RESEARCH Improving access and quality of care in a TB control ...

    African Journals Online (AJOL)

    or treatment. Improving access and quality of care in a. TB control programme. Vera Scott, Virginia Azevedo, Judy Caldwell. Objectives. To use a quality improvement approach to improve access to and quality of tuberculosis (TB) diagnosis and care in. Cape Town. Methods. Five HIV/AIDS/sexually transmitted infections/TB.

  4. Assurance and control of quality in trace element analysis

    International Nuclear Information System (INIS)

    Heinonen, J.

    1979-01-01

    The study demonstrates in practice the assurance and control of the quality of results from trace analysis in biological materials. The performance of three analytical methods is studied: one involving the determination of Cs and two the determination of As by neutron activation techniques in biological materials at the natural background level. In the case of Cs, the validity of the analytical procedure was investigated by the means available in the laboratory of the Institute and by utilizing the specific properties of the determinant. In the establishment and control of accuracy, the analysis of precision was essential. The investigation of the two different methods applied for the determination of arsenic demonstrates the many problems connected with trace analysis. For the control of accuracy a number of different kinds of reference materials (RMs) were used, namely four former intercomparison materials of the IAEA and two certified RMs of the NBS. The various tests performed revealed two different types of systematic errors. The scheme applied for the long-term surveillance of systematic and random errors is found to be suitable for the continuous control of quality of results from routine analysis. (author)

  5. Quality control chart for crushed granite concrete

    Directory of Open Access Journals (Sweden)

    Ewa E. DESMOND

    2016-07-01

    Full Text Available A chart for assessing in-situ grade (strength of concrete, has been developed in this study. Four grades of concrete after the Nigerian General Specification for Roads and bridges (NGSRB-C20, C25, C30 and C35, is studied at different water-cement ratios for medium and high slump range. The concrete mixes are made from crushed granite rock as coarse aggregate with river sand as fine aggregate. Compression test on specimens are conducted at curing age of 1, 3, 7, 14, 21, 28 and 56 days. Results on concrete workability from slump values, and water-cement ratios revealed that specimens with lower water-cement ratio were less workable but had higher strength, compared to mixes with higher water cement ratio. A simple algorithm using nonlinear regression analysis performed on each experimental data set produced Strength-Age (S-A curves which were used to establish a quality control chart. The accuracy of these curves were evaluated by computing average absolute error (AAS, the error of estimate (EoE and the average absolute error of estimate (Abs EoE for each concrete mix. These were done based on the actual average experimental strengths to measure how close the predicted values are to the experimental data set. The absolute average error of estimate (Abs. EoE recorded was less than ±10% tolerance zone for concrete works.

  6. The IAEA's programme in analytical quality control

    International Nuclear Information System (INIS)

    Suschny, O.

    1980-10-01

    The purpose of the Analytical Quality Control Programme of the International Atomic Energy Agency is to help laboratories in the Agency's Member States to assess and, if necessary, to improve the reliability of their analytical work in areas related to nuclear technology and radioisotope utilisation. This is done by the organisation of analytical intercomparisons and by the provision of certified or uncertified reference materials. Recently intercomparisons have been organised of trace element analysis in a soil and a lake sediment sample which have led to the certification of two new reference materials, SOIL-5 and SL-1 (lake sediment). A technique has been developed to recognise and to remove outlying results. Criteria have been established to classify element-concentration values into the categories ''established with a high degree of confidence'', ''established with a reasonable degree of confidence'' and ''information value only''. Four radionuclide intercomparisons have recently been carried out: W-1/1 and W-2/1 of the determination of selected radionuclides in water and Air-1/1 and Air-2/1 of that of selected radionuclides on simulated air filters. Details of the preparation of materials for these intercomparisons, and of data treatment and some results are discussed in the paper

  7. The quality control theory of aging

    Directory of Open Access Journals (Sweden)

    Warren Ladiges

    2014-05-01

    Full Text Available The quality control (QC theory of aging is based on the concept that aging is the result of a reduction in QC of cellular systems designed to maintain lifelong homeostasis. Four QC systems associated with aging are 1 inadequate protein processing in a distressed endoplasmic reticulum (ER; 2 histone deacetylase (HDAC processing of genomic histones and gene silencing; 3 suppressed AMPK nutrient sensing with inefficient energy utilization and excessive fat accumulation; and 4 beta-adrenergic receptor (BAR signaling and environmental and emotional stress. Reprogramming these systems to maintain efficiency and prevent aging would be a rational strategy for increased lifespan and improved health. The QC theory can be tested with a pharmacological approach using three well-known and safe, FDA-approved drugs: 1 phenyl butyric acid, a chemical chaperone that enhances ER function and is also an HDAC inhibitor, 2 metformin, which activates AMPK and is used to treat type 2 diabetes, and 3 propranolol, a beta blocker which inhibits BAR signaling and is used to treat hypertension and anxiety. A critical aspect of the QC theory, then, is that aging is associated with multiple cellular systems that can be targeted with drug combinations more effectively than with single drugs. But more importantly, these drug combinations will effectively prevent, delay, or reverse chronic diseases of aging that impose such a tremendous health burden on our society.

  8. The quality control theory of aging.

    Science.gov (United States)

    Ladiges, Warren

    2014-01-01

    The quality control (QC) theory of aging is based on the concept that aging is the result of a reduction in QC of cellular systems designed to maintain lifelong homeostasis. Four QC systems associated with aging are 1) inadequate protein processing in a distressed endoplasmic reticulum (ER); 2) histone deacetylase (HDAC) processing of genomic histones and gene silencing; 3) suppressed AMPK nutrient sensing with inefficient energy utilization and excessive fat accumulation; and 4) beta-adrenergic receptor (BAR) signaling and environmental and emotional stress. Reprogramming these systems to maintain efficiency and prevent aging would be a rational strategy for increased lifespan and improved health. The QC theory can be tested with a pharmacological approach using three well-known and safe, FDA-approved drugs: 1) phenyl butyric acid, a chemical chaperone that enhances ER function and is also an HDAC inhibitor, 2) metformin, which activates AMPK and is used to treat type 2 diabetes, and 3) propranolol, a beta blocker which inhibits BAR signaling and is used to treat hypertension and anxiety. A critical aspect of the QC theory, then, is that aging is associated with multiple cellular systems that can be targeted with drug combinations more effectively than with single drugs. But more importantly, these drug combinations will effectively prevent, delay, or reverse chronic diseases of aging that impose such a tremendous health burden on our society.

  9. Quality control culture of diagnostic ultrasound parameters

    International Nuclear Information System (INIS)

    Andam, A.A.B; Addison, E.C.K.; Aggry-Smith, S.; Nani, E.K.

    2003-01-01

    A phantom, consisting of two phases, has been designed and constructed to mimic the human body. The phase one phantom was designed to mimic a a surface lesion in the human body and the phase two phantom designed to mimic a section of the whole body. Ultrasound scans of the phantom were acquired for various material in the phantom at six hospitals in Kumasi, Ghana. A linear array transducer with parallel beams having a convex probe and a 3.5 MHz ultrasound frequency were used to carry out the experiment. It was observed that the depth of penetration of ultrasound, which constitutes the maximum depth of visualization or sensitivity, is determined by the frequency of the transducer, the attenuation of the medium being imaged and the system settings. Uniformity and linearity of the machines investigated were found to be within clinically acceptable standards. Spatial resolution, comprising axial and lateral resolutions, was observed to be satisfactory for the machines tested. It was observed that lateral resolution improved with the narrowing of the beam width. The ultrasound scanners at the selected hospitals were found to be operating at the expected level of performance. This work highlights the importance of putting in place a locally based mechanism for quality control of diagnostic ultrasound machines (author)

  10. QUALITY CONTROL OF SOME TRADITIONAL MEAT PRODUCTS

    Directory of Open Access Journals (Sweden)

    S. DOBRINAS

    2014-03-01

    Full Text Available In this paper, we present the characterization of six traditional meat products: smoked file, smoked bacon, pork sausages, sausage prepared from swine’s entrails, pork pastrami, sheep sausages. Organoleptic tests (the aspect and shape, the aspect of freshly cut in the section, smell, taste and consistency, physico-chemical and microbiological determinations (NTG, Salmonella, Listeria monocytogenes and Escherichia coli were performed. These analyzes are a part of quality control that must be done in order to obtain a certificate from the Ministry of Agriculture for a traditional product. After identification of H2S and starch and according to fat oxidation degree it was concluded that analyzed samples didn’t contain counterfeiters and all parameters analyzed are within the maximum limits allowed by law. Considering all the procedures for manufacturing, characteristics of raw and auxiliary materials, organoleptic properties of final products analyzed in this study, it can be concluded that analyzed meat specialties meet the requirements of Ministry Order no. 690/28.09.2004 for the traditional products certification.

  11. Bacterial lipoproteins; biogenesis, sorting and quality control.

    Science.gov (United States)

    Narita, Shin-Ichiro; Tokuda, Hajime

    2017-11-01

    Bacterial lipoproteins are a subset of membrane proteins localized on either leaflet of the lipid bilayer. These proteins are anchored to membranes through their N-terminal lipid moiety attached to a conserved Cys. Since the protein moiety of most lipoproteins is hydrophilic, they are expected to play various roles in a hydrophilic environment outside the cytoplasmic membrane. Gram-negative bacteria such as Escherichia coli possess an outer membrane, to which most lipoproteins are sorted. The Lol pathway plays a central role in the sorting of lipoproteins to the outer membrane after lipoprotein precursors are processed to mature forms in the cytoplasmic membrane. Most lipoproteins are anchored to the inner leaflet of the outer membrane with their protein moiety in the periplasm. However, recent studies indicated that some lipoproteins further undergo topology change in the outer membrane, and play critical roles in the biogenesis and quality control of the outer membrane. This article is part of a Special Issue entitled: Bacterial Lipids edited by Russell E. Bishop. Copyright © 2016 Elsevier B.V. All rights reserved.

  12. Quality assurance and quality control of nuclear analytical techniques

    International Nuclear Information System (INIS)

    Cincu, Emanuelathor

    2001-01-01

    Test and analytical laboratories in East and Central European countries need to prove the reliability and credibility of their economic, environmental, medical and legal decisions and their capacity of issuing reliable, verifiable reports. These demands imposed by the European Union aimed at avoiding a possible barrier to trade for the developing countries. In June 1999, in order to help Member States to develop according to EU objectives and the overall situation of the European market, IAEA launched a new co-operation programme designed to help the nuclear analytical laboratories in nuclear institutions and universities of Member States by training in the use of some Nuclear Analytical Techniques (NAT) that include: alpha, beta and gamma-ray spectrometry, radiochemical and neutron activation analysis, total reflection X-ray fluorescence. The Regional IAEA Project, named 'Quality Assurance/Quality Control of Nuclear Analytical Techniques' (NAT) aims at implementing the QA principles via a system of defined consecutive steps leading to a level on which the QA system is self-sustainable for formal accreditation or certification and satisfies the EU technical performance criteria; the requirements are in accordance with the new ISO/IEC 17025 Standard/Dec.1999 'General requirements for the competence of testing and calibration laboratories' - First edition. The Horia Hulubei National Institute for Nuclear Physics and Engineering, IFIN-HH, was admitted for participation in the IAEA Project in June 1999 account taken of its experience in the QA and metrology fields and its performance in the fields of beta and gamma-ray spectrometry, and radiochemical and neutron activation analysis, employed in both basic research and applications for external clients. Two working groups of specialists with the QA and Standardization and Metrology Departments and six analytical groups with the departments of Nuclear Applied Physics, Life Physics and Ionising Radiation Metrology are

  13. Quality control protocols for radiodiagnosis agents and radiopharmaceuticals; Protocolos de control de calidad para agentes de radiodiagnostico y radiofarmacos

    Energy Technology Data Exchange (ETDEWEB)

    Robles, A; Condor, M; Caballero, J; Morote, M; Garcia, C; Benites, M

    1997-07-01

    Based on the compilation of pharmacopoeia methods, literature, manuals and other information developed in our laboratory, protocols have been prepared to carry out quality controls for radiodiagnosis agents (RDA), better known as kits and RDA labelled with Tc99m. Quality control protocols cover physicochemical and biological controls. Physicochemical controls described for RDA include physical characteristics, particle size and number, pH, chemical identification, humidity, tin II; whereas biological controls include sterility, acute toxicity and bacterial endotoxin determination (LAL). Physicochemical controls described for radiopharmaceuticals labelled with Tc99m are pH and radiochemical purity; while biological distribution is described as a biological control.

  14. Mitochondrial quality control pathways as determinants of metabolic health

    NARCIS (Netherlands)

    Held, Ntsiki M.; Houtkooper, Riekelt H.

    2015-01-01

    Mitochondrial function is key for maintaining cellular health, while mitochondrial failure is associated with various pathologies, including inherited metabolic disorders and age-related diseases. In order to maintain mitochondrial quality, several pathways of mitochondrial quality control have

  15. Quality control in the commerce of irradiated foods

    International Nuclear Information System (INIS)

    Bustos R, M.E.

    2000-01-01

    In spite of an irradiated food is innocuous for health and that the irradiation process offers great advantages as conservation and hygiene method and it has been recognised by the Agriculture and Health International organizations and although the adequate equipment exists to make this treatment in the majority of countries, an international trade of irradiated foods has not been established and it is that it has to be required that the quality control of the treatment should be regulated by the corresponding authorities and it also should be harmonized with other countries for the commercial interchange. Owing to up to present an identification method of irradiated foods which is validated, the unique quality control for irradiated foods is realized in the irradiation plant, measuring the absorbed dose in products, using dosimetric systems justly calibrated and standardized to be used the adequate for the type of product and dose level which is wanted to be measured for foods mainly for quarantine treatment which is very important to determine that any part of the irradiation system has reached the minimum dose to obtain the technical effect which is desired and that it does not exceed the maximum dose for that the product quality not to be altered. (Author)

  16. Adaptive Method Using Controlled Grid Deformation

    Directory of Open Access Journals (Sweden)

    Florin FRUNZULICA

    2011-09-01

    Full Text Available The paper presents an adaptive method using the controlled grid deformation over an elastic, isotropic and continuous domain. The adaptive process is controlled with the principal strains and principal strain directions and uses the finite elements method. Numerical results are presented for several test cases.

  17. Methods for control over learning individual trajectory

    Science.gov (United States)

    Mitsel, A. A.; Cherniaeva, N. V.

    2015-09-01

    The article discusses models, methods and algorithms of determining student's optimal individual educational trajectory. A new method of controlling the learning trajectory has been developed as a dynamic model of learning trajectory control, which uses score assessment to construct a sequence of studied subjects.

  18. Retrospective exposure assessment and quality control in an international multi-centre case-control study

    DEFF Research Database (Denmark)

    Tinnerberg, H; Heikkilä, P; Huici-Montagud, A

    2003-01-01

    The paper presents the exposure assessment method and quality control procedure used in an international, multi-centre case-control study within a joint Nordic and Italian cohort. This study was conducted to evaluate whether occupational exposure to carcinogens influenced the predictivity of high...... was higher among the original assessors (the assessor from the same country as the subject) than the average prevalence assessed by the other four in the quality control round. The original assessors classified more job situations as exposed than the others. Several reasons for this are plausible: real...... country-specific differences, differences in information available to the home assessor and the others and misunderstandings or difficulties in translation of information. To ensure the consistency of exposure assessments in international retrospective case-control studies it is important to have a well...

  19. Descriptive study of the quality control in mammography

    International Nuclear Information System (INIS)

    Gaona, E.; Perdigon C, G.M.; Casian C, G.A.; Azorin N, J.; Diaz G, J.A.I.; Arreola, M.

    2005-01-01

    The goal of mammography is to provide contrast between a lesion that is possible residing within the breast and normal surrounding tissue. Quality control is essential for maintaining the contrast imaging performance of a mammography system and incorporate tests that are relevant in that they are predictive of future degradation of contrast imaging performance. These tests will also be done at frequency that is high enough to intercept most drifts in quality imaging or performance before they become diagnostically significant. The quality control study has as objective to describe the results of the assessment of quality imaging elements (film optical density, contrast (density difference), uniformity, resolution and noise) of 62 mammography departments without quality control program and comparison these results with a mammography reference department with a quality control program. When comparing the results they allow seeing the clinical utility of to have a quality control program to reduce the errors of mammography interpretation. (Author)

  20. Automated quality control in a file-based broadcasting workflow

    Science.gov (United States)

    Zhang, Lina

    2014-04-01

    Benefit from the development of information and internet technologies, television broadcasting is transforming from inefficient tape-based production and distribution to integrated file-based workflows. However, no matter how many changes have took place, successful broadcasting still depends on the ability to deliver a consistent high quality signal to the audiences. After the transition from tape to file, traditional methods of manual quality control (QC) become inadequate, subjective, and inefficient. Based on China Central Television's full file-based workflow in the new site, this paper introduces an automated quality control test system for accurate detection of hidden troubles in media contents. It discusses the system framework and workflow control when the automated QC is added. It puts forward a QC criterion and brings forth a QC software followed this criterion. It also does some experiments on QC speed by adopting parallel processing and distributed computing. The performance of the test system shows that the adoption of automated QC can make the production effective and efficient, and help the station to achieve a competitive advantage in the media market.