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Mary K. Schubauer-berigan - One of the best experts on this subject based on the ideXlab platform.
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Occupational Exposure Assessment in Carbon Nanotube and Nanofiber Primary and Secondary Manufacturers: Mobile Direct-Reading Sampling
Annals of Occupational Hygiene, 2012Co-Authors: Matthew M. Dahm, Mary K. Schubauer-berigan, Douglas E. Evans, M. Eileen Birch, James A. DeddensAbstract:pretation of the data. t o address this gap, air-monitoring was conducted at six sites identified as CNt and CNF manufacturers or users and results were compared with filter-based metrics. Methods: Particle number, respirable mass, and active surface area concentrations were monitored with a condensation particle counter, a photometer, and a diffusion charger, respectively. the instruments were placed on a mobile cart and used as area monitors in parallel with filter-based elemental carbon (EC) and electron microscopy samples. Repeat samples were collected on consecutive days, when possible, during the same processes. All instruments in this study are portable and routinely used for industrial hygiene sampling. Results: Differences were not observed among the various sampled processes compared with concurrent indoor or outdoor background samples while examining the different DRi exposure metrics. Such data were also inconsistent with results for filter-based samples collected concurrently at the same sites [Dahm MM, Evans DE, Schubauer-berigan MK et al. (2012) Occupational exposure assessment in CNt and nanofiber primary and secondary manufacturers. Ann Occup hyg; 56: 542–56]. Significant variability was seen between these processes as well as the indoor and outdoor backgrounds. however, no clear pattern emerged linking the DRi results to the EC or the microscopy data (CNt and CNF structure counts). Conclusions: Overall, no consistent trends were seen among similar processes at the various sites. the DRi instruments employed were limited in their usefulness in assessing and quantifying potential exposures at the sampled sites but were helpful for hypothesis generation, control technology evaluations, and other air quality issues. the DRis employed are nonspecific, aerosol monitors, and, therefore, subject to interferences. As such, it is necessary to collect samples for analysis by more selective, time-integrated, laboratory-based methods to confirm and quantify exposures.
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The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Estimates of Radiation-Related Cancer Risks
Radiation Research, 2007Co-Authors: Elisabeth Cardis, Martine Vrijheid, Maria Blettner, Ethel S. Gilbert, Matti Hakama, Hill C, Geoffrey R. Howe, John M. Kaldor, C R Muirhead, Mary K. Schubauer-beriganAbstract:Abstract Cardis, E., Vrijheid, M., Blettner, M., Gilbert, E., Hakama, M., Hill, C., Howe, G., Kaldor, J., Muirhead, C. R., Schubauer-Berigan, M., Yoshimura, T., Bermann, F., Cowper, G., Fix, J., Hacker, C., Heinmiller, B., Marshall, M., Thierry-Chef, I., Utterback, D., Ahn, Y-O., Amoros, E., Ashmore, P., Auvinen, A., Bae, J-M., Bernar, J. S., Biau, A., Combalot, E., Deboodt, P., Diez Sacristan, A., Eklof, M., Engels, H., Engholm, G., Gulis, G., Habib, R. R., Holan, K., Hyvonen, H., Kerekes, A., Kurtinaitis, J., Malker, H., Martuzzi, M., Mastauskas, A., Monnet, A., Moser, M., Pearce, M. S., Richardson, D. B., Rodriguez-Artalejo, F., Rogel, A., Tardy, H., Telle-Lamberton, M., Turai, I., Usel, M. and Veress, K. The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Estimates of Radiation-Related Cancer Risks. Radiat. Res. 167, 396– 416 (2007). A 15-Country collaborative cohort study was conducted to provide direct estimates of cancer risk following protracted low d...
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The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Design, Epidemiological Methods and Descriptive Results
Radiation Research, 2007Co-Authors: Martine Vrijheid, Elisabeth Cardis, Maria Blettner, Ethel S. Gilbert, Matti Hakama, Hill C, Geoffrey R. Howe, John M. Kaldor, C R Muirhead, Mary K. Schubauer-beriganAbstract:Abstract Vrijheid, M., Cardis, E., Blettner, M., Gilbert, E., Hakama, M., Hill, C., Howe, G., Kaldor, J., Muirhead, C. R., Schubauer-Berigan, M., Yoshimura, T., Ahn, Y-O., Ashmore, P., Auvinen, A., Bae, J-M., Engels, H., Gulis, G., Habib, R., Hosoda, Y., Kurtinaitis, J., Malker H., Moser, M., Rodriguez-Artalejo, F., Rogel, A., Tardy, H., Telle-Lamberton, M., Turai, I., Usel, M. and Veress, K. The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Design, Epidemiological Methods and Descriptive Results. Radiat. Res. 167, 361–379 (2007). Radiation protection standards are based mainly on risk estimates from studies of atomic bomb survivors in Japan. The validity of extrapolations from the relatively high-dose acute exposures in this population to the low-dose, protracted or fractionated environmental and occupational exposures of primary public health concern has long been the subject of controversy. A collaborative retrospective cohort study was conducted to prov...
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Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard
Radiation Research, 2007Co-Authors: Mary K. Schubauer-berigan, Robert D. Daniels, James R. Couch, Donald A. Fleming, Andrea M. Markey, Steven H. Ahrenholz, Jenneh S. Burphy, Jeri L. Anderson, Chih-yu TsengAbstract:Abstract Schubauer-Berigan, M. K., Daniels, R. D., Fleming, D. A., Markey, A. M., Couch, J. R., Ahrenholz, S. H., Burphy, J. S., Anderson, J. L. and Tseng, C-Y. Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard. Radiat. Res. 167, 222–232 (2007). A nested case-control study was conducted among workers at five U.S. nuclear facilities to evaluate leukemia mortality risk (excluding chronic lymphocytic) from ionizing radiation using worksite doses and adjusting for potential confounding. Conditional logistic regression was used to estimate the relative risk (RR) of exposed workers and the excess relative risk (ERR) per unit of radiation among 206 cases and 823 age-matched controls. Adjusting for sex and benzene, the RR of leukemia for workers receiving more than 10 mSv was higher compared to those receiving lower or no dose; however, the risk increase was attenuated in the highest dose gro...
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A nested case-control study of leukemia mortality and ionizing radiation at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: Travis L. Kubale, James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, James R. Couch, Susan J. Nowlin, Pi-hsueh ChenAbstract:Abstract Kubale, T. L., Daniels, R. D., Yiin, J. H., Couch, J., Schubauer-Berigan, M. K., Kinnes, G. H., Silver, S. R., Nowlin, S. J. and Chen, P. A Nested Case-Control Study of Leukemia Mortality and Ionizing Radiation at the Portsmouth Naval Shipyard. Radiat. Res. 164, 810–819 (2005). A nested case-control study using conditional logistic regression was conducted to evaluate the exposure–response relationship between external ionizing radiation exposure and leukemia mortality among civilian workers at the Portsmouth Naval Shipyard (PNS), Kittery, Maine. The PNS civilian workers received occupational radiation exposure while performing construction, overhaul, repair and refueling activities on nuclear-powered submarines. The study age-matched 115 leukemia deaths with 460 controls selected from a cohort of 37,853 civilian workers employed at PNS between 1952 and 1992. In addition to radiation doses received in the workplace, a secondary analysis incorporating doses from work-related medical X rays and oth...
Pi-hsueh Chen - One of the best experts on this subject based on the ideXlab platform.
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A nested case-control study of leukemia mortality and ionizing radiation at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: Travis L. Kubale, James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, James R. Couch, Susan J. Nowlin, Pi-hsueh ChenAbstract:Abstract Kubale, T. L., Daniels, R. D., Yiin, J. H., Couch, J., Schubauer-Berigan, M. K., Kinnes, G. H., Silver, S. R., Nowlin, S. J. and Chen, P. A Nested Case-Control Study of Leukemia Mortality and Ionizing Radiation at the Portsmouth Naval Shipyard. Radiat. Res. 164, 810–819 (2005). A nested case-control study using conditional logistic regression was conducted to evaluate the exposure–response relationship between external ionizing radiation exposure and leukemia mortality among civilian workers at the Portsmouth Naval Shipyard (PNS), Kittery, Maine. The PNS civilian workers received occupational radiation exposure while performing construction, overhaul, repair and refueling activities on nuclear-powered submarines. The study age-matched 115 leukemia deaths with 460 controls selected from a cohort of 37,853 civilian workers employed at PNS between 1952 and 1992. In addition to radiation doses received in the workplace, a secondary analysis incorporating doses from work-related medical X rays and oth...
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Risk of lung cancer and leukemia from exposure to ionizing radiation and potential confounders among workers at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, Dennis D. Zaebst, James R. Couch, Travis L. Kubale, Pi-hsueh ChenAbstract:Abstract Yiin, J. H., Schubauer-Berigan, M. K., Silver, S. R., Daniels, R. D., Kinnes, G. M., Zaebst, D. D., Couch, J. R., Kubale, T. L. and Chen, P-H. Risk of Lung Cancer and Leukemia from Exposure to Ionizing Radiation and Potential Confounders among Workers at the Portsmouth Naval Shipyard. Radiat. Res. 163, 603–613 (2005). Significantly elevated lung cancer deaths and statistically significantly positive linear trends between leukemia mortality and radiation exposure were reported in a previous analysis of Portsmouth Naval Shipyard workers. The purpose of this study was to conduct a modeling-based analysis that incorporates previously unanalyzed confounders in exploring the exposure–response relationship between cumulative external ionizing radiation exposure and mortality from these cancers among radiation-monitored workers in this cohort. The main analyses were carried out with Poisson regression fitted with maximum likelihood in linear excess relative risk models. Sensitivity analyses varying model...
Robert D. Daniels - One of the best experts on this subject based on the ideXlab platform.
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Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard
Radiation Research, 2007Co-Authors: Mary K. Schubauer-berigan, Robert D. Daniels, James R. Couch, Donald A. Fleming, Andrea M. Markey, Steven H. Ahrenholz, Jenneh S. Burphy, Jeri L. Anderson, Chih-yu TsengAbstract:Abstract Schubauer-Berigan, M. K., Daniels, R. D., Fleming, D. A., Markey, A. M., Couch, J. R., Ahrenholz, S. H., Burphy, J. S., Anderson, J. L. and Tseng, C-Y. Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard. Radiat. Res. 167, 222–232 (2007). A nested case-control study was conducted among workers at five U.S. nuclear facilities to evaluate leukemia mortality risk (excluding chronic lymphocytic) from ionizing radiation using worksite doses and adjusting for potential confounding. Conditional logistic regression was used to estimate the relative risk (RR) of exposed workers and the excess relative risk (ERR) per unit of radiation among 206 cases and 823 age-matched controls. Adjusting for sex and benzene, the RR of leukemia for workers receiving more than 10 mSv was higher compared to those receiving lower or no dose; however, the risk increase was attenuated in the highest dose gro...
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A nested case-control study of leukemia mortality and ionizing radiation at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: Travis L. Kubale, James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, James R. Couch, Susan J. Nowlin, Pi-hsueh ChenAbstract:Abstract Kubale, T. L., Daniels, R. D., Yiin, J. H., Couch, J., Schubauer-Berigan, M. K., Kinnes, G. H., Silver, S. R., Nowlin, S. J. and Chen, P. A Nested Case-Control Study of Leukemia Mortality and Ionizing Radiation at the Portsmouth Naval Shipyard. Radiat. Res. 164, 810–819 (2005). A nested case-control study using conditional logistic regression was conducted to evaluate the exposure–response relationship between external ionizing radiation exposure and leukemia mortality among civilian workers at the Portsmouth Naval Shipyard (PNS), Kittery, Maine. The PNS civilian workers received occupational radiation exposure while performing construction, overhaul, repair and refueling activities on nuclear-powered submarines. The study age-matched 115 leukemia deaths with 460 controls selected from a cohort of 37,853 civilian workers employed at PNS between 1952 and 1992. In addition to radiation doses received in the workplace, a secondary analysis incorporating doses from work-related medical X rays and oth...
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Risk of lung cancer and leukemia from exposure to ionizing radiation and potential confounders among workers at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, Dennis D. Zaebst, James R. Couch, Travis L. Kubale, Pi-hsueh ChenAbstract:Abstract Yiin, J. H., Schubauer-Berigan, M. K., Silver, S. R., Daniels, R. D., Kinnes, G. M., Zaebst, D. D., Couch, J. R., Kubale, T. L. and Chen, P-H. Risk of Lung Cancer and Leukemia from Exposure to Ionizing Radiation and Potential Confounders among Workers at the Portsmouth Naval Shipyard. Radiat. Res. 163, 603–613 (2005). Significantly elevated lung cancer deaths and statistically significantly positive linear trends between leukemia mortality and radiation exposure were reported in a previous analysis of Portsmouth Naval Shipyard workers. The purpose of this study was to conduct a modeling-based analysis that incorporates previously unanalyzed confounders in exploring the exposure–response relationship between cumulative external ionizing radiation exposure and mortality from these cancers among radiation-monitored workers in this cohort. The main analyses were carried out with Poisson regression fitted with maximum likelihood in linear excess relative risk models. Sensitivity analyses varying model...
James R. Couch - One of the best experts on this subject based on the ideXlab platform.
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Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard
Radiation Research, 2007Co-Authors: Mary K. Schubauer-berigan, Robert D. Daniels, James R. Couch, Donald A. Fleming, Andrea M. Markey, Steven H. Ahrenholz, Jenneh S. Burphy, Jeri L. Anderson, Chih-yu TsengAbstract:Abstract Schubauer-Berigan, M. K., Daniels, R. D., Fleming, D. A., Markey, A. M., Couch, J. R., Ahrenholz, S. H., Burphy, J. S., Anderson, J. L. and Tseng, C-Y. Risk of Chronic Myeloid and Acute Leukemia Mortality after Exposure to Ionizing Radiation among Workers at Four U.S. Nuclear Weapons Facilities and a Nuclear Naval Shipyard. Radiat. Res. 167, 222–232 (2007). A nested case-control study was conducted among workers at five U.S. nuclear facilities to evaluate leukemia mortality risk (excluding chronic lymphocytic) from ionizing radiation using worksite doses and adjusting for potential confounding. Conditional logistic regression was used to estimate the relative risk (RR) of exposed workers and the excess relative risk (ERR) per unit of radiation among 206 cases and 823 age-matched controls. Adjusting for sex and benzene, the RR of leukemia for workers receiving more than 10 mSv was higher compared to those receiving lower or no dose; however, the risk increase was attenuated in the highest dose gro...
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A nested case-control study of leukemia mortality and ionizing radiation at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: Travis L. Kubale, James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, James R. Couch, Susan J. Nowlin, Pi-hsueh ChenAbstract:Abstract Kubale, T. L., Daniels, R. D., Yiin, J. H., Couch, J., Schubauer-Berigan, M. K., Kinnes, G. H., Silver, S. R., Nowlin, S. J. and Chen, P. A Nested Case-Control Study of Leukemia Mortality and Ionizing Radiation at the Portsmouth Naval Shipyard. Radiat. Res. 164, 810–819 (2005). A nested case-control study using conditional logistic regression was conducted to evaluate the exposure–response relationship between external ionizing radiation exposure and leukemia mortality among civilian workers at the Portsmouth Naval Shipyard (PNS), Kittery, Maine. The PNS civilian workers received occupational radiation exposure while performing construction, overhaul, repair and refueling activities on nuclear-powered submarines. The study age-matched 115 leukemia deaths with 460 controls selected from a cohort of 37,853 civilian workers employed at PNS between 1952 and 1992. In addition to radiation doses received in the workplace, a secondary analysis incorporating doses from work-related medical X rays and oth...
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Risk of lung cancer and leukemia from exposure to ionizing radiation and potential confounders among workers at the Portsmouth Naval Shipyard.
Radiation Research, 2005Co-Authors: James H. Yiin, Mary K. Schubauer-berigan, Sharon R. Silver, Robert D. Daniels, Gregory M. Kinnes, Dennis D. Zaebst, James R. Couch, Travis L. Kubale, Pi-hsueh ChenAbstract:Abstract Yiin, J. H., Schubauer-Berigan, M. K., Silver, S. R., Daniels, R. D., Kinnes, G. M., Zaebst, D. D., Couch, J. R., Kubale, T. L. and Chen, P-H. Risk of Lung Cancer and Leukemia from Exposure to Ionizing Radiation and Potential Confounders among Workers at the Portsmouth Naval Shipyard. Radiat. Res. 163, 603–613 (2005). Significantly elevated lung cancer deaths and statistically significantly positive linear trends between leukemia mortality and radiation exposure were reported in a previous analysis of Portsmouth Naval Shipyard workers. The purpose of this study was to conduct a modeling-based analysis that incorporates previously unanalyzed confounders in exploring the exposure–response relationship between cumulative external ionizing radiation exposure and mortality from these cancers among radiation-monitored workers in this cohort. The main analyses were carried out with Poisson regression fitted with maximum likelihood in linear excess relative risk models. Sensitivity analyses varying model...
Viktor Freiman - One of the best experts on this subject based on the ideXlab platform.
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Investigating a case of hidden misinterpretations of an additive word problem: structural substitution
European Journal of Psychology of Education, 2016Co-Authors: Elena Polotskaia, Annie Savard, Viktor FreimanAbstract:© 2015 Instituto Superior de Psicologia Aplicada, Lisboa, Portugal and Springer Science+Business Media Dordrecht According to numerous studies (Barrouillet & Camos 2002; Brousseau 1988; Chevallard 1988; Riley et al. 1984; Schubauer-Leoni & Ntamakiliro, Revue Des Sciences de L’éducation, 20(1): 87–113, 1994; Vergnaud 1982; Xin, The Journal of Educational Research, 100(6):347–360, 2007), a combination of many factors, including curriculum, didactic contract and task design, can potentially lead to students experiencing difficulties in developing of a full understanding of addition and subtraction and their relationship in problem solving. Few studies (Conne, Recheche En Didactique Des Mathématiques, 5, 269–332, 1985; DeBlois, Éducation et Francophonie, 25(1), 102–120, 1997; Giroux & Ste-Marie, European Jornal of Psychology of Education, 16(2), 141–161, 2001) describe the misinterpretations of problems as a factor related to learning difficulties. We have studied how and why elementary school students misinterpret the mathematical structure of a simple additive word problem and what kind of possible (hidden) misinterpretation may occur. We analysed possible mechanisms of misinterpretations in word problem solving, discussing various examples of correct and incorrect solutions resulting from the misinterpretation of a problem. We gave the elementary school students a word problem, which could potentially be misinterpreted, and observed their solving strategies. Our results show how the particular form of mathematical misinterpretation—structure substitution—may help students obtain a correct answer and thereby hinder the development of their mathematical reasoning. We further discuss different ways of addressing this phenomenon in teaching practice.
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Investigating a case of hidden misinterpretations of an additive word problem: structural substitution
European Journal of Psychology of Education, 2015Co-Authors: Elena Polotskaia, Annie Savard, Viktor FreimanAbstract:According to numerous studies (Barrouillet & Camos 2002; Brousseau 1988; Chevallard 1988; Riley et al. 1984; Schubauer-Leoni & Ntamakiliro, Revue Des Sciences de L’education, 20(1): 87–113, 1994; Vergnaud 1982; Xin, The Journal of Educational Research, 100(6):347–360, 2007), a combination of many factors, including curriculum, didactic contract and task design, can potentially lead to students experiencing difficulties in developing of a full understanding of addition and subtraction and their relationship in problem solving. Few studies (Conne, Recheche En Didactique Des Mathematiques, 5, 269–332, 1985; DeBlois, Education et Francophonie, 25(1), 102–120, 1997; Giroux & Ste-Marie, European Jornal of Psychology of Education, 16(2), 141–161, 2001) describe the misinterpretations of problems as a factor related to learning difficulties. We have studied how and why elementary school students misinterpret the mathematical structure of a simple additive word problem and what kind of possible (hidden) misinterpretation may occur. We analysed possible mechanisms of misinterpretations in word problem solving, discussing various examples of correct and incorrect solutions resulting from the misinterpretation of a problem. We gave the elementary school students a word problem, which could potentially be misinterpreted, and observed their solving strategies. Our results show how the particular form of mathematical misinterpretation—structure substitution—may help students obtain a correct answer and thereby hinder the development of their mathematical reasoning. We further discuss different ways of addressing this phenomenon in teaching practice.