Gotowe bibliografie tematyczne / PCCDs

Gotowa bibliografia na temat „PCCDs”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "PCCDs"

1

Knops, Simon P., Marcel P. J. M. van Riel, Richard H. M. Goossens, Esther M. M. van Lieshout, Peter Patka i Inger B. Schipper. "Measurements of the Exerted Pressure by Pelvic Circumferential Compression Devices". Open Orthopaedics Journal 4, nr 1 (17.02.2010): 101–6. http://dx.doi.org/10.2174/1874325001004010101.

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Background: Data on the efficacy and safety of non-invasive Pelvic Circumferential Compression Devices (PCCDs) is limited. Tissue damage may occur if a continuous pressure on the skin exceeding 9.3 kPa is sustained for more than two or three hours. The aim of this study was to gain insight into the pressure build-up at the interface, by measuring the PCCD-induced pressure when applying pulling forces to three different PCCDs (Pelvic Binder®, SAM-Sling® and T-POD®) in a simplified model. Methods: The resulting exerted pressures were measured at four ‘anatomical’ locations (right, left, posterior and anterior) in a model using a pressure measurement system consisting of pressure cuffs. Results: The exerted pressure varied substantially between the locations as well as between the PCCDs. Maximum pressures ranged from 18.9-23.3 kPa and from 19.2-27.5 kPa at the right location and left location, respectively. Pressures at the posterior location stayed below 18 kPa. At the anterior location pressures varied markedly between the different PCCDs. Conclusion: The circmferential compression by the different PCCDs showed high pressures measured at the four locations using a simplified model. Difference in design and functional characteristics of the PCCDs resulted in different pressure build-up at the four locations. When following the manufacturer’s instructions, the exerted pressure of all three PCCDs tested exceeded the tissue damaging level (9.3 kPa). In case of prolonged use in a clinical situation this might put patients at risk for developing tissue damage.
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2

Huangfu, Huihui, Qinwen Yu, Peiwu Shi, Qunhong Shen, Zhaoyang Zhang, Zheng Chen, Chuan Pu i in. "The Impacts of Regional Regulatory Policies on the Prevention and Control of Chronic Diseases in China: A Mediation Analysis". Healthcare 9, nr 8 (18.08.2021): 1058. http://dx.doi.org/10.3390/healthcare9081058.

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Regional regulatory policies (RPs) are a major factor in the prevention and control of chronic diseases (PCCDs) through the implementation of various measures. This study aimed to explore the impacts of RPs on PCCDs, with a focus on the mediating roles of community service. The soundness of the regulatory mechanism (SORM) was used to measure the soundness of RPs based on 1095 policy documents (updated as of 2015). Coverage provided by community service institutions (CSIs) and community health centres (CHCs) was used to represent community service coverage derived from the China Statistical Yearbook (2015), while the number of chronic diseases (NCDs) was used to measure the effects of PCCDs based on data taken from the 2015 China Health and Retirement Longitudinal Study survey. To assess the relationship between SORM, NCDs and community service, a negative binomial regression model and mediation analysis with bootstrapping were conducted. Results revealed that there was a negative correlation between SORM and NCDs. CSIs had a major effect on the relationship between RPs and PCCDs, while CHCs had a partial mediating effect. RPs can effectively prevent and control chronic diseases. Increased effort should also be aimed at strengthening the roles of CSIs and CHCs.
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Kuner, Valerie, Nicole van Veelen, Stephanie Studer, Bryan Van de Wall, Jürgen Fornaro, Michael Stickel, Matthias Knobe, Reto Babst, Frank J. P. Beeres i Björn-Christian Link. "Application of Pelvic Circumferential Compression Devices in Pelvic Ring Fractures—Are Guidelines Followed in Daily Practice?" Journal of Clinical Medicine 10, nr 6 (21.03.2021): 1297. http://dx.doi.org/10.3390/jcm10061297.

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Early administration of a pelvic circumferential compression device (PCCD) is recommended for suspected pelvic trauma. This study was conducted to evaluate the prevalence of PCCD in patients with pelvic fractures assigned to the resuscitation room (RR) of a Level I trauma center. Furthermore, correct application of the PCCD as well as associated injuries with potential clinical sequelae were assessed. All patients with pelvic fractures assigned to the RR of a level one trauma center between 2016 and 2017 were evaluated retrospectively. Presence and position of the PCCD on the initial trauma scan were assessed and rated. Associated injuries with potential adverse effects on clinical outcome were analysed. Seventy-seven patients were included, of which 26 (34%) had a PCCD in place. Eighteen (23%) patients had an unstable fracture pattern of whom ten (56%) had received a PCCD. The PCCD was correctly placed in four (15%) cases, acceptable in 12 (46%) and incorrectly in ten (39%). Of all patients with pelvic fractures (n = 77, 100%) treated in the RR, only one third (n = 26, 34%) had a PCCD. In addition, 39% of PCCDs were positioned incorrectly. Of the patients with unstable pelvic fractures (n = 18, 100%), more than half either did not receive any PCCD (n = 8, 44%) or had one which was inadequately positioned (n = 2, 11 %). These results underline that preclinical and clinical education programs on PCCD indication and application should be critically reassessed.
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4

Bryson, D. J., R. Davidson i R. Mackenzie. "Pelvic circumferential compression devices (PCCDs): a best evidence equipment review". European Journal of Trauma and Emergency Surgery 38, nr 4 (2.03.2012): 439–42. http://dx.doi.org/10.1007/s00068-012-0180-3.

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Bryson, D. J., R. Prest i R. Mackenzie. "Pelvic circumferential compression devices (PCCDs): A best evidence equipment review". Injury Extra 42, nr 9 (wrzesień 2011): 124. http://dx.doi.org/10.1016/j.injury.2011.06.282.

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6

Syed, Daneyal, Debra Hoppensteadt, Daniel Kahn, Job Harenberg i Jawed Fareed. "Oral Anti-Factor Xa and Factor IIa Agent Mediated Inhibition Of Tissue-Factor Mediated Generation Of Thrombin In Prothrombin Complex Concentrates". Blood 122, nr 21 (15.11.2013): 4810. http://dx.doi.org/10.1182/blood.v122.21.4810.4810.

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Introduction Several oral anti-factor IIa and factor Xa agents have recently been developed. These include the thrombin inhibitors Ximelagatran/Melagatran (M) and Dabigatran Etexilate/Dabigatran (D), which require endogenous conversion to the active agents D and M. The factor Xa inhibitors, Rivaroxaban (R) and Apixaban (A), are anti-Xa agents that do not require any endogenous activation. Ximelagatran was withdrawn from the market due to adverse reactions. Dabigatran, Rivaroxaban, and Apixaban are approved for various clinical indications. Antagonism of the anticoagulant effect may be required in bleeding complications. Contradictory results were reported for the efficacy of various prothrombin complex concentrates (PCCs) with these new oral anticoagulants (NOACs). The purpose of this study was to determine the differences in the thrombin generation inhibitory profiles of the newer oral anticoagulant agents. Methods Commercially available PCCs namely Octaplex and Beriplex, were used as a source of Factors II, VII, IX and X. To investigate the effect of each of these agents, a working solution of 1U/ml of both PCCs were supplemented in a graded concentration of 0-1250ng/ml with M, D, R and A. Thrombin generation studies were carried out using a thromboplastin activator (RC High, Technoclone Vienna, Austria). Total thrombin generated was measured in terms of nM’s. The IC-50 for each agent was calculated individually. The time course of thrombin generation was also measured following the kinetic profiles and AUC. Results Dabigatran and Melagatran produced relatively weaker inhibition of thrombin generation with the IC-50 values ranging from 410-110ng/ml in Beriplex and 350-1120ng/ml in Octaplex. Both Rivaroxaban and Apixaban produced strong inhibition of thrombin generation, with the IC-50 ranging from 58-62ng/ml in Octaplex; whereas, in Beriplex these values ranged from 48-50ng/ml. The onset time for thrombin generation and total thrombin formation was concentration dependent. The kinetics of thrombin generation with A and R were distinct from D and M. At concentrations below 310ng/ml the total amount of thrombin generated was comparable to the control; however, its formation was delayed. In both systems, D exhibited the weakest thrombin generation inhibitory potential. While the onset time of thrombin generation was delayed at concentrations below 310ng/ml the levels were comparable to or higher than the control. Discussion This data suggests that PCC’s such as Octaplex and Beriplex can be used to generate thrombin and it’s inhibition by new oral anticoagulant drugs. Octaplex generates much higher amount of thrombin than Beriplex at equivalent units. These results also show that in comparison to the oral anti-Xa agents, the oral anti-IIa agents are relatively weaker inhibitors of thrombin generation. These studies also suggest that the differential inhibition of the generation of thrombin through tissue factor by the anti-Xa and IIa agents may contribute to the potential neutralization profile of PCC’s for these drugs. Disclosures: No relevant conflicts of interest to declare.
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Su, Yi Guo, Yue Meng, Yue Ban i Xiao Jing Wang. "Study on the Electron Excitation for Polychlorinated Dibenzo-P-Dioxins and Several Aromatic Substances by DFT Method". Advanced Materials Research 282-283 (lipiec 2011): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.17.

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The electronic excitations and electron absorption spectra of polychlorinated dibenzo-p-dioxins (PCDDs) were investigated by the time-dependent density functional theory (/DFT). The main spectral features were interpreted on the basis of the electronic structure of PCDDs by fully considering the possible interference of coexist organic molecules for the electron spectra. With the numbers of benzene rings in aromatic molecules increasing, the excitation energies decrease. The excitation energies of the compounds with three or four benzene rings (phenanthrene or fluoranthene) fall into the electronic transition regions of PCDDs. Therefore these compounds were not possible differentiate from the electron spectra of PCDDs. Furthermore, with the amounts of benzene rings extending to surpass three and four, the energies decease continuously and run beyond of the transition energy ranges of PCDDs. Thus the electron excitation energies of those aromatic molecules with three or four benzene rings were in the range of PCDDs, acting as the possible interferential substances for the detecting of PCDDs.
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Vácha, R., M. Vysloužilová i V. Horváthová. "Polychlorinated dibenzo-p-dioxines and dibenzofurans in agricultural soils of the Czech Republic". Plant, Soil and Environment 51, No. 10 (19.11.2011): 464–68. http://dx.doi.org/10.17221/3618-pse.

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The set of 102 samples of agricultural soils was taken for the study of the load of agricultural soils with polychlorinated dibenzo-p-dioxins and dibenzofuranes (PCDDs/Fs). The background value of PCDDs/Fs in agricultural soils of theCzech Republicwas determined. The soils with different sources of the load of PCDDs/Fs were compared. It was concluded that fluvisols in fluvial zones and soils with long-term sludge application are soils with the highest contents of PCDDs/Fs. The soils affected by imission outputs show a lower intensity of the load with PCDDs/Fs that is characterised by higher content of toxic congeners.
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Huang, Ling-Hui, Lian-Shin Lin, Chun-Li Wang, Yu-Chen Chang, Lung-Chun Lee, Chung-Chieh Hu, Pi-Shan Hsu i Wei-Min Chu. "Palliative Care Consultation Services on Terminally Ill Cancer Patients and Non-Cancer Patients: Trend Analysis from a 9-Year-Long Observational Study in Taiwan". International Journal of Environmental Research and Public Health 18, nr 18 (19.09.2021): 9882. http://dx.doi.org/10.3390/ijerph18189882.

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Early integration of palliative care for terminally ill cancer and non-cancer patients improves quality of life. However, there are sparse data on results of palliative care consultation services (PCCS) between cancer and non-cancer patients. In this 9-year observational study, data were collected from the Hospice-Palliative Clinical Database (HPCD) of Taichung Veterans General Hospital (TCVGH). Terminally ill cancer and non-cancer patients who received PCCS during 2011 to 2019 were enrolled. Trend analysis was performed to evaluate differences in outcomes of PCCS, including duration of PCCS, the awareness of disease of patients and families before and after PCCS, status of PCCS termination, and DNR declaration before and after PCCS among cancer and non-cancer patients throughout study period. In total, 5223 cancer patients and 536 non-cancer patients received PCCS from 2011 to 2019. The number of people who received PCCS increased stably over the decade, both for cancer and non-cancer patients. The average duration of PCCS for cancer and non-cancer patients was 21.4 days and 18.4 days, respectively. Compared with non-cancer patients, cancer patients had longer duration of PCCS, less DNR declaration (82% vs. 98%, respectively), and more transfers to the palliative care unit (17% vs. 11%, respectively), or for palliative home care (12% vs.8%, respectively). Determinants of late referral to PCCS includes age (OR 0.992, 95% CI 0.987–0.996), DNR declaration after PCCS (OR 1.967, 95% CI 1.574–2.458), patients’ awareness after PCCS (OR 0.754, 95% CI 0.635–0.895), and status of PCCS termination. This 9-year observational study showed that the trend of PCCS among cancer and non-cancer patients had changed over the duration of the study, and early integration of PCCS to all patients is essential for both cancer and non-cancer patients.
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Sadeghi, Nasir, Daniel Kahn, Josephine Cunanan, Arthur Only, Debra Hoppensteadt, Walter Jeske, Omer Iqbal, Job Harenberg i Jawed Fareed. "Compositional Differences in Commercially Available Prothrombin Complex Concentrates". Blood 120, nr 21 (16.11.2012): 4391. http://dx.doi.org/10.1182/blood.v120.21.4391.4391.

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Abstract Abstract 4391 Prothrombin complex concentrates (PCCs) are used in the management of bleeding complications with conventional oral anticoagulant drugs such as warfarin. These concentrates are also used in supportive therapy for hemostatic disorders. More recently these agents have been investigated for neutralization of the newer oral anticoagulant drugs such as the direct factor Xa and thrombin inhibitors. Since the activation of these complexes results in the generation of factor Xa and IIa, these agents may potentially neutralize both Xa and thrombin inhibitors. However, the potency of these agents is defined in units which represent the level of factor IX, other factors including factor II, VII, and X are also present, and in unspecified amounts. Moreover, other vitamin K-dependent proteins such as protein C, protein S, and protein Z may also be present. Varying amounts of albumin and other agent such as heparin and antithrombin may also be present as an additive. The purpose of this study is to compare the compositions of the currently available PCCs such as Profilnine®, Beriplex®, Cofact®, Octaplex®, Prothromplex®, and the older agents such as Konyne®, Preconetiv®, and Feiba®. Materials and Methods: Commercially available PCCs were obtained from various suppliers. Each of the individual vials of these concentrates was diluted with saline to obtain a 10 U/ml factor IX solution. Protein content was measured using Lowry's method. Sodium dodecyl sulfate polyacrylamide gel (SDS-PAGE) electrophoresis was carried out by dilution of each concentrates to 2 U/ml. Western blot analysis was performed to determine presence of prothrombin, prothrombin-1, and thrombin using anti-human recombinant thrombin antibody capable recognizing these proteins. Tissue factor activation profiles of each PCCs was also studied using Innovin®. The protein composition of native and activated prothrombin complexes was also investigated using surface-enhanced laser desorption/ionization (SELDI) mass spectrometry utilizing the gold chip array (BioRad). Tissue factor mediated thrombin generation by each of the prothrombin complex was studied using a fluorometric method (Technoclone, Vienna, Austria). Results: The total protein content of these PCCs ranged from 18–106 mg/100U. Some of the products were found to contain varying amounts of albumin, antithrombin and heparin as evident in both SDS-PAGE and SELDI analysis. The SDS-PAGE profile of these complexes showed multiple protein bands ranging from 15 to 250 kDa. Beriplex and Profilnine showed fewer bands; Profilnine® mainly exhibited 250, 110, 75 kDa bands and Beriplex® mainly 75 and 66 kDa bands. The other products contain additional bands in the range of 15 to 66 kDa representing albumin and other products. In the SELDI analysis multiple peaks consistent with the SDS-PAGE profile were noted. The immunoblotting showed a major band 70–75 kDa (prothrombin) along with a 50 kDa band representing prethrombin-1. Prior to activation, Feiba® exhibited a distinct additional 37 kDa dense band, (thrombin). SELDI analysis also indicated variable amounts of prothrombin in the products. Upon activation all PCC's were capable of generating thrombin as measured by SELDI and immunoblotting. The prothrombin band completely disappears from all PCCs except Preconetiv®, the prevalent products being prethombin-1 and thrombin. The amount of the prethrombin-1 band varied widely among products; and nearly disappears from all as it is converted to thrombin with time of incubation. The amount of thrombin activity generated from each prothrombin complex was concentration dependent and ranged from 30–1044nm/1.25 units/ml. Octaplex and Cofact produced the strongest thrombin activity whereas Beriplex and Prothromplex produced the least thrombin activity. Conclusions: This study shows that despite standardization in factor IX units, at equivalent IX unit potency these agents widely vary in their composition. Beriplex® and Profilnine® represent purer preparations. Upon activation of prothrombin initiated by tissue factor each complex is capable of generating varying amounts of thrombin. Because of these wide variations in protease generation the relative neutralization potential of each of these PCCs may also differ widely. Thus each of these products should thus be considered as a distinct agent and their efficacies individually determined for a given indication. Disclosures: No relevant conflicts of interest to declare.
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Rozprawy doktorskie na temat "PCCDs"

1

Prange, Joelle, i n/a. "Origin of Dioxins in Queensland: Investigations into the Distribution and Sources of Polychlorinated Dibenzo-P-Dioxins in the Queensland Terrestrial Environment". Griffith University. School of Public Health, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040615.161651.

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Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) are persistent organic pollutants of global concern as they are persistent, toxic and can biomagnify through the food chain. PCDD/Fs are generally regarded as trace contaminants in a number of chemical products and they are formed as by-products from various industrial, chemical and combustion processes. The pollution with PCDD/Fs occurs with the release of these chemicals into the environment, resulting in the contamination of various compartments including; air, soil, sediment and biota. Studies that have investigated the distribution of PCDD/Fs in the environment suggest that the highest concentrations of these pollutants are found in locations with a history of industrial or chemical PCDD/F sources. Queensland is the north-eastern state of Australia. Queensland has a low population density, few industrial activities and is considered predominantly rural. Therefore it was somewhat surprising that elevated concentrations of PCDD/Fs (in particular the higher chlorinated PCDDs) have been observed in soil and sediments samples collected from various locations along the Queensland coast. The concentrations of PCDDs in Queensland samples were comparable to or higher than concentrations in similar matrices from highly polluted regions elsewhere. To investigate the origin of PCDDs in Queensland, the geographical distribution of PCDD/Fs in topsoil was investigated in the coastal and inland environments to provide information on the potential sources and to estimate the extent of the PCDD contamination. Distinct east-west gradients were detected in topsoil collected from bushland areas across the state with elevated PCDD concentrations confined to the coastal region. Within the coastal region, the contamination could not be associated with specific land uses. In fact, the PCDD/F congener profile was similar in the majority of samples from the coastal region, with a dominance of the higher chlorinated PCDDs (in particular OCDD), whereas PCDFs were low or below the limit of detection. The similarity in the PCDD/F congener profiles in the soils along the coastal region indicated that a source of PCDDs of similar origin has resulted in the contamination of soil extending more than 3000 km and estimations suggest that more than 50 tonnes of OCDD is stored in the topsoil of Queensland.s coastal region. Investigation into the vertical distribution of PCDDs in Queensland coastal soils revealed elevated concentrations of PCDDs, (in particular OCDD) in soils to at least 3.5 m. These results indicated that the extent of the PCDD contamination is significantly greater than anticipated and it was estimated that there is in the order of 3 000 tonnes of OCDD stored in Queensland's coastal soils. The specific PCDD/F congener profile in Queensland coastal soils is unlike known PCDD/F source profiles which led to the suggestion that some yet unidentified formation mechanism may have resulted in the contamination. Potential natural sources of PCDD/Fs, including forest fires, geogenic and biogenic processes were assessed as possible origins for the PCDD contamination in Queensland. Elevated concentrations of PCDDs were detected in the atmosphere during a 'prescribed burn'. This study demonstrated that although forest fires influence atmospheric PCDD/F concentrations substantially, forest fires are not the source of PCDDs in Queensland; rather they are an important mechanism for the redistribution of PCDDs and may have attributed to the widespread PCDD contamination. In this study geological materials (oil shale and kaolin) were analysed as a proxy to assess a geogenic origin of PCDDs. Elevated concentrations of PCDDs were observed in the kaolin samples, however similar and higher concentrations were detected in surface and sub-surface soils, suggesting that specific geogenic formation processes investigated are not the source of PCDDs in Queensland. A preliminary indication for a biogenic origin of PCDDs was identified during the anaerobic incubation of sugarcane irrigation sediments. An increase in the concentration of OCDD in the anaerobic treatment, compared to the control was observed after incubation for 90 days. In these same experiments, a dechlorination of OCDD to lower chlorinated (1,4,6,9-substituted) PCDDs was also observed. Similar transformation processes were observed in other anaerobic environments in Queensland, which led to the suggestion that a biogenic formation of PCDDs (possibly from a precursor) may be responsible for the origin of PCDDs in Queensland.
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2

Prange, Joelle. "Origin of Dioxins in Queensland: Investigations into the Distribution and Sources of Polychlorinated Dibenzo-P-Dioxins in the Queensland Terrestrial Environment". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367289.

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Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) are persistent organic pollutants of global concern as they are persistent, toxic and can biomagnify through the food chain. PCDD/Fs are generally regarded as trace contaminants in a number of chemical products and they are formed as by-products from various industrial, chemical and combustion processes. The pollution with PCDD/Fs occurs with the release of these chemicals into the environment, resulting in the contamination of various compartments including; air, soil, sediment and biota. Studies that have investigated the distribution of PCDD/Fs in the environment suggest that the highest concentrations of these pollutants are found in locations with a history of industrial or chemical PCDD/F sources. Queensland is the north-eastern state of Australia. Queensland has a low population density, few industrial activities and is considered predominantly rural. Therefore it was somewhat surprising that elevated concentrations of PCDD/Fs (in particular the higher chlorinated PCDDs) have been observed in soil and sediments samples collected from various locations along the Queensland coast. The concentrations of PCDDs in Queensland samples were comparable to or higher than concentrations in similar matrices from highly polluted regions elsewhere. To investigate the origin of PCDDs in Queensland, the geographical distribution of PCDD/Fs in topsoil was investigated in the coastal and inland environments to provide information on the potential sources and to estimate the extent of the PCDD contamination. Distinct east-west gradients were detected in topsoil collected from bushland areas across the state with elevated PCDD concentrations confined to the coastal region. Within the coastal region, the contamination could not be associated with specific land uses. In fact, the PCDD/F congener profile was similar in the majority of samples from the coastal region, with a dominance of the higher chlorinated PCDDs (in particular OCDD), whereas PCDFs were low or below the limit of detection. The similarity in the PCDD/F congener profiles in the soils along the coastal region indicated that a source of PCDDs of similar origin has resulted in the contamination of soil extending more than 3000 km and estimations suggest that more than 50 tonnes of OCDD is stored in the topsoil of Queensland.s coastal region. Investigation into the vertical distribution of PCDDs in Queensland coastal soils revealed elevated concentrations of PCDDs, (in particular OCDD) in soils to at least 3.5 m. These results indicated that the extent of the PCDD contamination is significantly greater than anticipated and it was estimated that there is in the order of 3 000 tonnes of OCDD stored in Queensland.s coastal soils. The specific PCDD/F congener profile in Queensland coastal soils is unlike known PCDD/F source profiles which led to the suggestion that some yet unidentified formation mechanism may have resulted in the contamination. Potential natural sources of PCDD/Fs, including forest fires, geogenic and biogenic processes were assessed as possible origins for the PCDD contamination in Queensland. Elevated concentrations of PCDDs were detected in the atmosphere during a 'prescribed burn'. This study demonstrated that although forest fires influence atmospheric PCDD/F concentrations substantially, forest fires are not the source of PCDDs in Queensland; rather they are an important mechanism for the redistribution of PCDDs and may have attributed to the widespread PCDD contamination. In this study geological materials (oil shale and kaolin) were analysed as a proxy to assess a geogenic origin of PCDDs. Elevated concentrations of PCDDs were observed in the kaolin samples, however similar and higher concentrations were detected in surface and sub-surface soils, suggesting that specific geogenic formation processes investigated are not the source of PCDDs in Queensland. A preliminary indication for a biogenic origin of PCDDs was identified during the anaerobic incubation of sugarcane irrigation sediments. An increase in the concentration of OCDD in the anaerobic treatment, compared to the control was observed after incubation for 90 days. In these same experiments, a dechlorination of OCDD to lower chlorinated (1,4,6,9-substituted) PCDDs was also observed. Similar transformation processes were observed in other anaerobic environments in Queensland, which led to the suggestion that a biogenic formation of PCDDs (possibly from a precursor) may be responsible for the origin of PCDDs in Queensland.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Public Health
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Harrad, Stuart J. "Levels and sources of PCDDs and PCDFs in UK soils". Thesis, University of East Anglia, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327955.

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Halevi, Cliff Hunter 1956. "ELECTROMAGNETIC PERFORMANCE OF A PORTED COAXIAL CABLE SENSOR (PCCS) SYSTEM". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276465.

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An experimental analysis of the factors which affect the sensitivity of the Ported Coaxial Cable Sensor (PCCS) system is presented. The measured response profile of the test system is compared against variations of cable separation distance, soil conductivity and permittivity, and magnetic field intensity above the transmitter cable. These experiments show that higher conductivity and permittivity of the burial medium results in a decrease in the strength of the magnetic field above the transmitter cable, and that this results in a decrease in response number. The results of these experiments are compared with the results obtained from a theoretical analysis of a simplified model. An experimentally derived relationship between cable separation distance and response number, which is valid for all soil types, can be applied to predictably minimize variations in sensitivity, resulting in a response ratio for each cell which will not exceed 3:1.
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5

Hess, Philipp. "The determination and environmental significance of planar aromatic compounds in the marine environment". Thesis, Robert Gordon University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388494.

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Mohr, Susana. "RESÍDUOS DE POLUENTES ORGÂNICOS PERSISTENTES EM MEL DE ABELHAS: REPERCUSSÕES DA CONTAMINAÇÃO AMBIENTAL". Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/3407.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Persistent Organic Pollutants (POPs) are chemical substances that are widely distributed throughout the environment, accumulate in the fatty tissue of living organisms, are found at higher concentrations in the food chain and are toxic to both humans and wildlife. In the present work, POPs were determined in honey samples from different geographic regions, evaluating both the quality and safety of honey as food, and the environmental contamination of the studied regions. Organochlorine pesticides were analysed in 186 samples from the South region of Brazil, with concentrations between Os Poluentes Orgânicos Persistentes (POPs) são compostos químicos sintéticos que estão amplamente distribuídos no meio ambiente, acumulam-se nos tecidos lipídicos dos seres vivos, são encontrados em altas concentrações na cadeia alimentar e apresentam efeitos tóxicos aos seres humanos e animais. No presente trabalho, os POPs foram determinados em mel de abelhas de diferentes regiões geográficas, buscando avaliar a qualidade e segurança do mel como alimento, bem como a contaminação ambiental das regiões estudadas. Os praguicidas organoclorados foram analisados em 186 amostras da região Sul do Brasil, com concentrações que variaram entre
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Silva, Joice de Oliveira Epif?nio da. "A inser??o de pessoas com defici?ncia no mercado de trabalho: os sentidos da Lei de Cotas para os gestores de Recursos Humanos da regi?o metropolitana do Rio de Janeiro". Universidade Federal Rural do Rio de Janeiro, 2017. https://tede.ufrrj.br/jspui/handle/jspui/2456.

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
Law No. 8213/91, known as the Quota Law was formulated as a tool to implement the National Policy on Employment Dues for Persons with Disabilities. This law today is one of the main means for the insertion of PCDs (Persons with Disabilities) into the labor market. However, the implementation of this law occurs in the face of some difficulties, such as accessibility, for example, in addition to prejudice regarding PCDs in the social environment, which ultimately interferes with its effectiveness. The purpose of this paper is to understand the meanings attributed to the Quota Law by HR Managers who act or have acted in organizations that apply the Quota Law. In order to achieve this goal, nine interviews were conducted, of which eight interviews were conducted with managers, some of whom were in full exercise until the date of the interview, and others who had recently left the organization in which they performed HR functions, and was also interviewed the coordinator of the State Nucleus for Assistance to the Disabled (NEAD). Besides the interviews, this work made use of the technique of observation and the analysis of the collected material occurred through the Nuclei of Meaning. The results show that the managers interviewed still perceive the Quota Law as a merely punitive Law, however, they understand the Quota Law also, as an important one, if not unique, tool for the insertion of PCDs into the labor market. With this, it can be said that the meanings that managers attribute to the Quota Law are loaded with prejudice and the way the Quota Law is signified by these managers reflects in the way they execute this Law, and it can be affirmed that the issue is cultural.
A lei n? 8213/91, conhecida como Lei de Cotas foi formulada como ferramenta para implementar a Pol?tica Nacional de Cotas Empregat?cias para Portadores de Defici?ncia. Esta lei hoje ? um dos principais meios para a inser??o das PCDs (Pessoas com Defici?ncia) no mercado de trabalho. Contudo, a implementa??o desta lei ocorre diante de algumas dificuldades, como a acessibilidade, por exemplo, al?m do preconceito no que tange ?s PCDs no meio social, o que acaba interferindo na efetividade da mesma. Este trabalho tem como objetivo, compreender os sentidos atribu?dos ? Lei de Cotas pelos Gestores de RH que atuam, ou atuaram, em organiza??es que se aplica a Lei de Cotas. Para atingir este objetivo foram realizadas nove entrevistas, sendo oito entrevistas realizadas com gestores, dos quais alguns estavam em pleno exerc?cio da fun??o at? a data da entrevista e outros que haviam sa?do recentemente da organiza??o em que exercia a fun??o de gestor de RH, e ainda, foi entrevistada a coordenadora do N?cleo Estadual de Atendimento ao Deficiente (NEAD). Al?m das entrevistas este trabalho fez uso da t?cnica de observa??o e a an?lise do material levantado ocorreu por meio dos N?cleos de Significa??o. Os resultados mostram que os gestores entrevistados ainda percebem a Lei de Cotas como uma Lei meramente punitiva, entretanto, entendem a Lei de Cotas tamb?m, como uma importante, sen?o ?nica, ferramenta para a inser??o das PCDs no mercado de trabalho. Com isso, pode-se afirmar que os sentidos que os gestores atribuem a Lei de Cotas s?o carregados de preconceito e a forma como a Lei de Cotas ? significada por esses gestores reflete na forma como executam essa Lei, e ainda, pode-se afirmar que a quest?o ? cultural
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Cheong, Tsang Wing. "An evaluation study on the patient-centered communication skills (PCCS) training for residents at the hospital authority". Thesis, University of Leicester, 2003. http://hdl.handle.net/2381/30825.

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In collaboration with the Training and Education Unit of the Hong Kong Hospital Authority, an evaluation study on the effectiveness of the patient-centered communication skills (PCCS) program was carried out for 106 residents in the out-patient clinics of the New Territories East Cluster Region from May 2001 to March 2002. A training evaluation framework was formulated to measure residents' reaction, learning and behavior. An attempt was also made to relate the results of the program to organizational improvement, Le. improvement in patient satisfaction. A number of evaluation tools were used, such as an end-of-program evaluation questionnaire, pre-program and post-program behavioral assessment questionnaires and complaints digests. Focus group interviews with residents were also arranged to solicit in-depth information on the effectiveness of the PCCS program. Encouraging results were recorded from different levels of evaluation. The residents were satisfied with the PCCS program with respect to program objectives, contents, materials, methodology and learning environment. Particularly, they were satisfied with the trainers who were perceived to have played an important role in sharing their hands-on experience in interacting with patients. As for the learning of residents, the pre-/post-learning quiz results demonstrated that the program had increased residents' knowledge and skills relating to patient-centered communication. Despite a number of identified barriers for the transfer of learning, the behavior of the residents was felt to have improved after training, as confirmed by the results of the pre-/post-behavior assessments by the residents and their supervisors. The program also had some significant impact on patient satisfaction as reflected from the complaints and appreciation digests. Patients had shown positive response to the doctors' communication skills during the consultation process. A number of valuable recommendations on program contents, implementation strategies and reinforcement activities were put forward to the Hospital Authority's management for consideration. Key words Patient-centered communication, Evaluation, Reaction, Learning, Behavior, Organizational Results.
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Larsson, Daniel. "Mobilisation of soil-bound dioxins at an old sawmill area : Impact of excavation on groundwater levels of PCDF/PCDDs at Norrbyskär". Thesis, Umeå universitet, Kemiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-124420.

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CASTRO, José Joaquim Martins de. "A Configuração da carreira do magistério da rede pública de educação básica do município Cametá/PA nos PCCRS municipais (2006-2013)". Universidade Federal do Pará, 2016. http://repositorio.ufpa.br/jspui/handle/2011/8600.

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O surgimento de Planos de Carreira do Magistério no Brasil, nos anos de 1990, no contexto das reformas sociais, políticas e educacionais globalizantes, propostos na CF/1988 e na LDBN – 9.394/96, representaram fato novo e determinante para a (re)valorização da carreira dos profissionais do magistério. Este cenário ensejou esta pesquisa “A Configuração da Carreira do Magistério da Rede Pública de Educação Básica do Município de Cametá/PA nos PCCRs Municipais (2006-2013). A pesquisa em tela objetivou estudar a configuração da carreira dos profissionais da educação básica, no município de Cametá/PA, tendo como elemento de análise os PCCRs implantados neste município. Para nortear o processo utilizamos a seguinte questão, como objetivo geral: Como se configura a carreira dos professores da rede pública de educação básica de Cametá/PA, a partir das regulamentações legais de âmbito municipal vigente e PCCRs, Leis nº 066/2006; nº 212/2012 e nº 256/2013. E, como objetivos específicos: a) identificar e analisar dispositivos legais, no âmbito do município de Cametá/PA, os PCCRs aprovados no contexto recente das políticas reformistas e globalizantes, que tratam da carreira do magistério e sua configuração; b) analisar como se configura a carreira do magistério neste município, quanto a presença de elementos de valorização da carreira dos professores da educação básica a partir dos seguintes elementos: Ingresso na Carreira; Formas de Progressão; Vencimento e Remuneração; Jornada de Trabalho e Estímulo à Formação; c) avaliar se apresentam-se como estímulo e/ou incentivo para uma melhor remuneração, valorização, atratividade e incentivo à permanência na carreira. A metodologia de pesquisa utilizada foi a abordagem qualitativa e a estratégia de investigação foi o estudo de caso. A coleta de dados foi desenvolvida por meio de revisão bibliográfica e documental sobre carreira do magistério, com base em autores e especialistas da área, assim como legislações nacionais e municipais. A pesquisa articulou ainda, informações quali-quantitativas, pois se utiliza de importantes dados numéricos, tratados em tabelas e quadros dentro desta pesquisa. Os resultados obtidos nos permitem concluir que as legislações de âmbito nacional, implantadas principalmente a partir dos anos de 1990, que tratam da carreira do magistério no Brasil, tiveram grande influência e foram determinantes para a implementação de normatizações em nível de município. Constatou-se ainda, que o contexto de implementação dos PCCRs municipais (Leis nº 066/2006, nº 212/2012 e nº 256/2013), apresentou melhorias e conquistas de direitos, visto que os mesmos foram elaborados em consonância com as determinações das legislações nacionais. Esta (re)configuração da carreira do magistério apresentou elementos de valorização e atratividade para a carreira dos professores. Quanto a vencimento e remuneração, evidenciou-se que os PCCRs municipais ao obedecerem a determinações das políticas de fundo (FUNDEF e FUNDEB) e da Lei do Piso, possibilitaram melhores ganhos salariais aos profissionais da educação. Entretanto, verificou-se também que, apesar das evidências de avanços na carreira, se faz necessário garantir aumentos salariais reais, capazes de elevar a renda dos profissionais da educação, melhorando as condições de trabalho, transformando a carreira docente, neste município, em fator de atratividade.
The emergence of Teaching Career Plans in Brazil, in the 1990s, in the context of social, policies and globalizing educational reforms proposed in the Constitution of the Federative Republic of Brazil (1988) and in LDBN - 9.394/96, represented a new and decisive fact for the (re)enhancement of teaching professionals career. This scenario gave rise to this research "Setting of Public Basic Education Teaching Career of Cametá/PA in PCCRs: Law No. 066/2006; Law No. 212/2012 and Law No. 256/2013". The research aimed to study the setting of primary education professionals career in the municipality of Cametá/PA, with the PCCRs deployed in this city as analysis element. To guide the process we used the following question as a general objective: How the career of public school basic education teachers of Cametá/PA is set, from the legal regulations in municipal extent and PCCRs, Laws No. 066/2006; No. 212/2012 and No. 256/2013. And as specific objectives: to identify and analyze legal devices, within the municipality of Cametá/PA, the PCCRs approved in the recent context of reforming and globalizing policies dealing with the teaching career and its setting; to analyze how the teaching career in this city is set, regarding to the presence of enhancement elements of basic education teachers' career from the following elements: join career; progression forms; salary and remuneration; working hours; encouraging formation; assess whether they are presented as a stimulus and/or incentive for better pay, appreciation, attractiveness and incentive to keep in career. The research methodology was qualitative approach and the research strategy was the case study. Data collection was developed through bibliographical and documentary review on teaching career, based on authors and experts in the field, as well as national and municipal laws. The research also articulated qualitative and quantitative information, since it uses important numerical data processed in tables and charts within this research. The results allow us to conclude that the national legislation, implanted mainly from the 1990s, dealing with teaching career in Brazil, had a great influence and were instrumental in the implementation of norms on the municipal level. Also, it was found that the context of implementation of municipal PCCRs (Laws No. 066/2006, No. 212/2012 and No. 256/2013), introduced improvements and rights achievements, since they were prepared in accordance with national laws’ determinations. This teaching career (re)setting presented enhancement and attractiveness’ elements for teachers career. Concerning to salary and remuneration, it became clear that in the municipality of Cametá the implementation of fund policies (FUNDEF and FUNDEB) enabled better salary gains to education professionals. However, it was also noted that, despite evidences of career advancement, it is necessary to ensure real salary increases in order to raise the income of education professionals, transforming it into attractiveness factor for the teaching profession, thus improving the economic and financial structure of the teacher.
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Książki na temat "PCCDs"

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Parr, Terence John. Language translation using PCCTS and C++: A reference guide. San Jose, California: Automata, 1996.

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Harrad, Stuart. Levels and sources of PCDDs and PCDFs in UK soils. Norwich: University of East Anglia, 1989.

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Ball, William E. An introduction to PCCS, the PLSS Coordinate Computational System. [Denver, Colo.]: Division of Technical Services, Bureau of Land Management, Denver Service Center, 1988.

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Lee, Anthony. Assessment of PCDDs and PCDFs from PCB transformer and capacitor fires. Cincinnati, OH: U.S. Environmental Protection Agency, Hazardous Waste Engineering Research Laboratory, 1985.

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William, Haller. Streamlining your audit process with PCC's guide to risk-based audits. Fort Worth, Tex: Practitioners Pub. Co., 1999.

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Ball, William E. A brief description of PCCS, the PLSS Coordinate Computational System. [Denver, Colo.]: Division of Technical Services, Bureau of Land Management, Denver Service Center, 1988.

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Pallais, Don. New issues in audit and accounting: PCC's annual audit and accounting update. Fort Worth, Tex: Practitioners Pub., 1999.

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Sheffield, Arthur. Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs): Sources and releases. Ottawa: Environmental Protection Service, 1985.

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Mujica, Javier. Herramientas jurídicas para la defensa de los Derechos Humanos de las PCDs. Jesús María, Lima: CEDAL, Centro de Asesoría Laboral del Perú, 2005.

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Campbell, Beverly. Characterization of PCB transformer/capacitor fluids and correlation with PCDDs and PCDFs in soot. Cincinnati, OH: U.S. Environmental Protection Agency, Hazardous Waste Engineering Research Laboratory, 1987.

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Części książek na temat "PCCDs"

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Safe, S., i O. Hutzinger. "PCDDs and PCDFs: Sources and Environmental Impact". W Environmental Toxin Series, 1–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-70556-4_1.

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Zhao, Lijun, i Tiesheng Dou. "Theoretical Study of the Reinforcement of Pre-stressed Concrete Cylinder Pipes with External Pre-stressed Strands". W Advances in Frontier Research on Engineering Structures, 467–73. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_42.

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AbstractReinforcement of the pre-stressed concrete cylinder pipes with external pre-stressed strands is an effective way to enhance a prestressed concrete cylinder pipe’s ability to bear the design hydraulic pressure. A theoretical derivation is studied, and this formula derivation could be used to determine the cross-sectional area per unit length. This derivation determine the cross-sectional area and target tensile strength of steel strands in order to meet the requirements of ultimate limit states, serviceability limit states, and quasi-permanent limit states. The theoretical results agree well with the experimental results. This paper could provide technical supports for the application of the external reinforcement of PCCPs with strands.
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Bordajandi, Luisa R., Belén Gómara i María José González. "Analysis of Dioxins and Furans (PCDDs and PCDFs) in Food". W Analysis of Endocrine Disrupting Compounds in Food, 49–73. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781118346747.ch3.

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Lv, Cheng. "Color Analysis of Room Space Based on Computer PCCS System". W Lecture Notes in Electrical Engineering, 2381–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0115-6_296.

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Zhao, Tianke. "RUL Prediction of Railway PCCS Based on Data-Driven Method". W Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2021, 133–45. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9913-9_16.

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Kgatle, Mookgo Solomon. "Dis/Continuity with Cultic Tendencies in Classical Pentecostal and Charismatic Churches (PCCs)". W Christianity and Renewal - Interdisciplinary Studies, 157–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69724-2_8.

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Andersson, Malin, Yngvil Holt i Ola A. Eggen. "Polychlorinated Dibenzo-p-dioxins and Dibenzofurans (PCDDs/PCDFs) in Urban Surface Soil in Norway". W Mapping the Chemical Environment of Urban Areas, 473–86. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470670071.ch27.

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Dudzińska, Marzenna R. "Polychlorinated Dibenzo-P-Dioxins (PCDDs) and Dibenzofurans (PCDFs) in Sewage and Sludge of MWTP". W Chemistry for the Protection of the Environment 4, 203–13. Boston, MA: Springer US, 2005. http://dx.doi.org/10.1007/0-387-27448-0_18.

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Deng, Lifen, Roger Nilen i Serdar Ozbayraktar. "The Effects of Diamond Grit Characteristics on the Microstructure and Abrasion Resistance of PCDs Sintered by HPHT". W Proceedings of the 41st International Conference on Advanced Ceramics and Composites, 1–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119474678.ch1.

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McDaniel, John L. M. "Evaluating the Ability and Desire of Police and Crime Commissioners (PCCs) to Deliver Community-Oriented Policing in Practice". W Societal Implications of Community-Oriented Policing and Technology, 39–46. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89297-9_5.

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Streszczenia konferencji na temat "PCCDs"

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Kim, Duksu, Jae-Pil Heo i Sung-eui Yoon. "PCCD". W SIGGRAPH '09: Posters. New York, New York, USA: ACM Press, 2009. http://dx.doi.org/10.1145/1599301.1599351.

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Kimis, Thabata Regina Prosdos, i Nelson Alexandre Paulino. "Mobilidade Autônoma para PCDs". W XXVIII SIMPÓSIO INTERNACIONAL DE ENGENHARIA AUTOMOTIVA. São Paulo: Editora Blucher, 2021. http://dx.doi.org/10.5151/simea2021-pap126.

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Diab, Youssef Georges, i Thomas Bonierbale. "A Numerical Modeling and a Proposal for Rehabilitation of PCCPs". W Pipeline Division Specialty Conference 2001. Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40574(2001)36.

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Gao, Zhengyang, i Peng Ji. "The Reactivities In Different HgCl Substitution Sites Of PCDDs/PCDFs". W 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/emcpe-16.2016.124.

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Yang, Lin, Cheng Li, Wang-Fang Du, Zhan Gao i Shan Zhou. "Air Velocity Influence on Heat Transfer in the PCCS". W 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67024.

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The passive containment cooling system (PCCS) is important passive safety systems in the Advanced Pressurized Water Reactor (APWR), which belongs to the generation III of nuclear reactors. In design basis accident (DBA), the steam condenses on the inner surface of the containment shell and the cooling water evaporates from the outer surface of the containment shell. In this process, the heat is transferred from the inside of the containment to the outside. To span the expected range of conditions and provide a proper model for evaluating the inner steam condensation coupled with outer evaporation heat transfer process, the inner steam condensation coupled outer evaporation experimental test (ISCOE) is developed by State Nuclear Power Technology Research & Development Centre (SNPTRD). Several tests have been done on the ISCOE experimental test facility. The influence of different key factors for the capability of the heat transfer of the containment steel shell wall has been researched. Key factors include steam pressure, steam temperature, water film velocity, air velocity, steel shell wall angle, and so on. The result of these tests has an important significance to the research of heat transfer capability of the containment steel shell wall. In this paper, several tests are introduced, including details, results and analysis. The influence of air velocity for the capability of the heat transfer of the containment steel shell wall is also analyzed.
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Yu, Yu, Shengfei Wang i Fenglei Niu. "Reliability of PCCS in AP1000 Based on Accident Development". W 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60155.

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Passive containment cooling system (PCCS) is an important safety-related system in AP1000 nuclear power plant, by which heat produced in reactor is transferred to the heat sink – atmosphere – based on natural circulation, independent of human response or the operation of outside equipments, so the reactor capacity of resisting external hazards (earthquake, flood, etc.) is improved. However since the system operation based on natural circulation, many uncertainty factors such as temperatures of cold and heat sources will affect the system reliability, and physical process failure becomes one of the important contributors to system failure, which is not considered in the active system reliability analysis. That is, the system will lose its function since the natural circulation cannot be established or kept even when the equipments in the system can work well. The function of PCCS in AP1000 is to transfer the heat produced in the containment to the environment and to keep the pressure in the containment below its threshold. After accidents the steam is injected to the containment and can be cooled and condensed when it arrives at the containment wall, then the heat is transferred to the atmosphere through the steel vessel. So the peak value of the pressure is influenced by the steam situation which is injected into the containment and the heat transfer and condensate processes under the accidents. In this paper the dynamic thermal-hydraulic (T-H) model simulating the fluid performance in the containment is established, based on which the system reliability model is built. Here the total pressure in the containment is used as the success criteria. Apparently the system physical process failure may be related to the system working state, the outside conditions, the system structure parameters and so on, and it’s a heavy work to analyze the influences of all the factors, so only the effects of important ones are included in the model. Monte Carlo (MC) simulation is used to evaluate the system reliability, in which the input parameters such as air temperature are sampled based on their probabilistic density distributions. The pressure curves along with the accident development are gained and the system reliabilities under different accidents are gotten as well as the main contributors. The results illustrate that the system physical process failure probabilities are varied under different climate conditions, which result in the system reliability and the main contributors to system failure changing, so the different methods can be taken to improve the system reliability according to the local condition of the nuclear power plant.
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Zhao, Tianke, Xiukun Wei i Xuewu Yang. "Improved YOLO v5 for Railway PCCS Tiny Defect Detection". W 2022 14th International Conference on Advanced Computational Intelligence (ICACI). IEEE, 2022. http://dx.doi.org/10.1109/icaci55529.2022.9837504.

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Zhou, Wenzhong, Gavin Henderson i Shripad T. Revankar. "Experimental Study of Effects of Non-Condensable on Condensation in a Vertical Tube Bundle". W ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88497.

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One of the engineered safety systems in the advanced boiling water reactor is a passive containment cooling system (PCCS) which is composed of a number of vertical heat exchanger. After a loss of coolant accident, the pressurized steam discharged from the reactor and the noncondensable (NC) gases mixture flows into the PCCS condenser tube. The PCCS condenser must be able to remove sufficient energy from the reactor containment to prevent containment from exceeding its design pressure. The efficient performance of the PCCS condenser is thus vital to the safety of the reactor. In PCCS condenser tube three flow conditions are expected namely the forced flow, cyclic venting and complete condensation modes. The PCCS test facility consists of steam generator (SG), instrumented condenser with secondary pool boiling section, condensation tank, suppression pool, storage tank, air supply line, and associated piping and instrumentation. The specific design of condensing tube is based on scaling analysis from the PCCS design of ESBWR. The scaled PCCS is made of four tubes of diameter 52.5mm and height 1.8 m arranged in square pitch. Steam air mixture condensation tests were carried out in a through flow mode of operation where the mixture flows through the condenser tube with some steam condensation. Data on condensation heat transfer were obtained for two nominal pressures, 225 kPa and 275 kPa and for air concentration fraction from 0 to 13%. Test results showed that with increase in pressure the condensation heat transfer increased. The presence of the air in the steam decreased the condensation heat transfer coefficient from 10 to 45% depending on air fraction in the steam.
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Revankar, Shripad T., i Wenzhong Zhou. "Vertical Tube Passive Condenser Under Secondary Pool Water Level Transient". W 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23125.

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An experimental work was carried out on a passive containment cooling system (PCCS) test facility where the effect of PCCS pool water level change on the PCCS heat transfer characteristics was investigated. The specific design of condensing tube was based on scaling analysis from the PCCS design of Economic Simplified Boiling Water Reactor (ESBWR). The annulus between the primary condensing tube and the secondary boiling tube is filled with water and serves as water pool. During the test, steam generated in the pool is discharged through three steam exit nozzles located symmetrically at the top of the secondary boiling tube. Transient tests carried out with secondary pool water level change show that the system pressure for complete condensation mode increases with decrease in water level, however rate of condensation is almost constant. However, if the PCCS is operated in through flow mode the system pressure (primary side pressure) is constant, however, the condensate rate decreases indicating that some of the steam does not condense.
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Wenying, Ji, Lu Changdong, Ou Yangyong i Chen Yichen. "Analysis of the Thermal Performance of the Passive Containment Cooling System Based on Heat Pipe Technology Under Nuclear Accidents". W 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93273.

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Abstract To evaluate the thermal performance of a closed-loop Passive Containment Cooling System (PCCS) based on hot pipe technology under nuclear accidents, the coupled effect of three systems of reactor primary cooling circuit, containment and the PCCS is analyzed under LB-LOCA with SBO and SB-LOCA with SBO with the PCCS started one hour after the accident. The coupled analysis method is that the heat transfer power of PCCS simulated by the LOCUST model and the mass and energy releasing results obtained from the integrated analysis program for serious accidents are the inputs for containment thermal response analysis code. The results showed that in the 0∼10 hours after the accident, the containment pressure is less than the design limit of 5.20bar.a; in the middle and long term of ten more hours after the accident, the containment pressure is less than 3.50bar.a, the integrity of the containment can be ensured and the feasibility of the design of the PCCS in this paper is validated.
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Raporty organizacyjne na temat "PCCDs"

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Brown, K. G., i M. A. Pickett. DWPF PCCS version 2. 0 test case. Office of Scientific and Technical Information (OSTI), sierpień 1992. http://dx.doi.org/10.2172/6745310.

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Brown, K. G., i M. A. Pickett. DWPF PCCS version 2.0 test case. Revision 1. Office of Scientific and Technical Information (OSTI), sierpień 1992. http://dx.doi.org/10.2172/10123979.

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Lugar, R. M. Results of monitoring for PCDDs and PCDFs in ambient air at McMurdo Station, Antarctica. Office of Scientific and Technical Information (OSTI), wrzesień 1993. http://dx.doi.org/10.2172/10192134.

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