Study of the Impact of Stellite Material on PWR Co-60 Contamination

2017 ◽  
Author(s):  
Liying Zhang ◽  
Yaxiao Wang ◽  
Xiaoxia Wang ◽  
Bo Gao ◽  
Aijun Mi ◽  
...  
Keyword(s):  
Positive Impact ◽  
Occupational Exposures ◽  
High Energy ◽  
Primary Circuit ◽  
Primary Coolant ◽  
Radiation Fields ◽  
Piping Systems ◽  
Energy Gamma ◽  
The Impact

According with the requirements of HAF-102[1], the purpose of radiation protection optimization is to achieve occupational exposures as low as reasonably achievable (ALARA). More than 80% of the collective exposure doses are received during the outage for PWRs. Activated corrosion products, especially Co-60, deposited on the surface of reactor coolant system are the main causes of these doses. Co-60 is the principle contributor to out-of-core radiation fields in PWRs, which is a high energy gamma emitter with a 5.3 year half-life period. The contamination by Co-60 plates out in plant piping systems and produces long term high radiation areas in the plant. Stellite, a hard facing alloy trade, which has high Co-59 content (approximately 60%), is identified as one of the most important source of Co-60 in reactors, whereas the contribution of Stellite to cobalt are always not paid enough attention to. Cobalt is released through ware and corrosion of Stellite. When cobalt is released in systems with a flow path to the reactor, it can become activated by neutron to Co-60. This paper analyzes the Stellite material release into the primary coolant. Based on the above considerations, the impact of Stellite replacement on plant contamination by Co-60 is calculated and analyzed with the use of activated corrosion product source term calculation program. The primary conclusions are as follows: (1) Reducing the quantity of Stellite material used during the design and building of PWRs can significantly reduce the Co-60 deposition on primary circuit. (2) The replacement of Stellite material has a positive impact on PWR contamination by Co-60, but the outcome is not so significant. Based on the above analysis, recommendations are made. Stellite material replacement project can be used for the operating reactors to reduce the Co-60 contamination. But for the design and building of new reactors, reduction of the use of Stellite material is the best choice.

scholarly journals Paleolithic Diet—Effect on the Health Status and Performance of Athletes?

Nutrients ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 1019
Author(s):  
Barbara Frączek ◽  
Aleksandra Pięta ◽  
Adrian Burda ◽  
Paulina Mazur-Kurach ◽  
Florentyna Tyrała
Keyword(s):  
Blood Pressure ◽  
Body Mass ◽  
Positive Impact ◽  
Model Assessment ◽  
Paleolithic Diet ◽  
Short Term ◽  
Positive Effects ◽  
Short And Long Term ◽  
The Impact

The aim of this meta-analysis was to review the impact of a Paleolithic diet (PD) on selected health indicators (body composition, lipid profile, blood pressure, and carbohydrate metabolism) in the short and long term of nutrition intervention in healthy and unhealthy adults. A systematic review of randomized controlled trials of 21 full-text original human studies was conducted. Both the PD and a variety of healthy diets (control diets (CDs)) caused reduction in anthropometric parameters, both in the short and long term. For many indicators, such as weight (body mass (BM)), body mass index (BMI), and waist circumference (WC), impact was stronger and especially found in the short term. All diets caused a decrease in total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and triglycerides (TG), albeit the impact of PD was stronger. Among long-term studies, only PD cased a decline in TC and LDL-C. Impact on blood pressure was observed mainly in the short term. PD caused a decrease in fasting plasma (fP) glucose, fP insulin, and homeostasis model assessment of insulin resistance (HOMA-IR) and glycated hemoglobin (HbA1c) in the short run, contrary to CD. In the long term, only PD caused a decrease in fP glucose and fP insulin. Lower positive impact of PD on performance was observed in the group without exercise. Positive effects of the PD on health and the lack of experiments among professional athletes require longer-term interventions to determine the effect of the Paleo diet on athletic performance.

scholarly journals The Long-Term Impact of Different Offline Population Inclusion Strategies in Probability-Based Online Panels: Evidence From the German Internet Panel and the GESIS Panel

2021 ◽  
pp. 089443932098413
Author(s):  
Carina Cornesse ◽  
Ines Schaurer
Keyword(s):  
Survey Data ◽  
Positive Impact ◽  
Alternative Mode ◽  
Mail Surveys ◽  
Internet Users ◽  
Online Panels ◽  
Long Term Impact ◽  
The Impact ◽  
Postal Mail

While online panels offer numerous advantages, they are often criticized for excluding the offline population. Therefore, some probability-based online panels have developed offline population inclusion strategies. Two dominant approaches prevail: providing internet equipment and offering an alternative survey participation mode. We investigate the impact of these approaches on two probability-based online panels in Germany: the German Internet Panel, which provides members of the offline population with internet equipment, and the GESIS Panel, which offers members of the offline population to participate via postal mail surveys. In addition, we explore the impact of offering an alternative mode only to non-internet users versus also offering the alternative mode to internet users who are unwilling to provide survey data online. Albeit lower recruitment and/or panel wave participation probabilities among offliners than onliners, we find that including the offline population has a positive long-term impact on sample accuracy in both panels. In the GESIS Panel, the positive impact is particularly strong when offering the alternative participation mode to non-internet users and internet users who are unwilling to provide survey data online.

Welfare Use in Japan: Trends and Determinants

2007 ◽  
pp. 88
Author(s):  
Wataru Suzuki ◽  
Yanfei Zhou
Keyword(s):  
Time Series ◽  
Longitudinal Data ◽  
Time Series Data ◽  
Positive Impact ◽  
Series Data ◽  
Negative Effects ◽  
Long Time ◽  
Welfare Use ◽  
The Impact

This article represents the first step in filling a large gap in knowledge concerning why Public Assistance (PA) use recently rose so fast in Japan. Specifically, we try to address this problem not only by performing a Blanchard and Quah decomposition on long-term monthly time series data (1960:04-2006:10), but also by estimating prefecturelevel longitudinal data. Two interesting findings emerge from the time series analysis. The first is that permanent shock imposes a continuously positive impact on the PA rate and is the main driving factor behind the recent increase in welfare use. The second finding is that the impact of temporary shock will last for a long time. The rate of the use of welfare is quite rigid because even if the PA rate rises due to temporary shocks, it takes about 8 or 9 years for it to regain its normal level. On the other hand, estimations of prefecture-level longitudinal data indicate that the Financial Capability Index (FCI) of the local government2 and minimum wage both impose negative effects on the PA rate. We also find that the rapid aging of Japan's population presents a permanent shock in practice, which makes it the most prominent contribution to surging welfare use.

scholarly journals Organizational Learning and Motivation: Assessing the impact on Employee Performance

2016 ◽  
Vol 5 (2) ◽  
pp. 355 ◽  
Author(s):  
Puja Sareen ◽  
Parikshit Joshi
Keyword(s):  
Organizational Learning ◽  
Organizational Performance ◽  
Positive Impact ◽  
Employee Performance ◽  
Employee Motivation ◽  
Primary Data ◽  
Hygiene Factors ◽  
And Performance ◽  
The Impact

<em>Organizational learning has the potential to improve organizational performance. For any organization to sustain long term benefits it requires to establish a mechanism to tap the knowledge and use this knowledge in taking future decisions. This study tries to capture the role of Organizational Learning and Employee Motivation and its impact on the Employees’ Performance. The study is exploratory and descriptive in nature. The questionnaire used for primary data collection has its items collected and derived from various standardized questionnaires available. The analysis of the primary data shows that there is a positive correlation between Organizational Learning and Organizational Performance. On understanding Herzberg theory of motivation the study came to conclusion that employees consider hygiene factors of motivation more significant than the motivator factors. The motivation level of employees in an organization has positive impact on the overall performance of any organization. The study helps the organizations to understand the relationship between learning and performance considering motivation as a mediating variable. </em>

scholarly journals The Impact of Mobile Technology on a UK Police Force and Their Knowledge Sharing

2009 ◽  
Vol 08 (02) ◽  
pp. 101-112 ◽  
Author(s):  
Rachael Lindsay ◽  
Louise Cooke ◽  
Tom Jackson
Keyword(s):  
Knowledge Sharing ◽  
Mobile Technology ◽  
Information Overload ◽  
Positive Impact ◽  
Evaluation Study ◽  
Police Force ◽  
Ethnographic Approach ◽  
The Impact ◽  
Method Approach

The paper discusses an evaluation study that investigates the impact of mobile technology on a UK police force and on knowledge sharing processes. An empirical, ethnographic approach to the research was adopted, using a mixed method approach of focus groups, questionnaires, observational "work shadowing" and interviews with a total of 42 staff involved in a trial of mobile technology. The findings from the various methods are consistent, suggesting that mobile technology has a positive impact on policing and knowledge sharing. The timeliness of information improved, increasing the availability of information for decision-making. Reductions in information overload were apparent due to mobile technology providing greater control over information. There was a positive impact on knowledge sharing in the course of operational duties. Information and knowledge could be shared more quickly with officers in the field; and mobile technology provided a new avenue for keeping each other up to date with events. The paper contributes towards an understanding of the upcoming concept of "mobile knowledge management" and offers a set of recommendations to manage the possible long-term risk of mobile technology on knowledge sharing.

scholarly journals Effect of Drought on Outbreaks of Major Forest Pests, Pine Caterpillars (Dendrolimus spp.), in Shandong Province, China

Forests ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 264 ◽  
Author(s):  
Yongbin Bao ◽  
Fei Wang ◽  
Siqin Tong ◽  
Li Na ◽  
Aru Han ◽  
...  
Keyword(s):  
Positive Impact ◽  
Shandong Province ◽  
Forest Damage ◽  
Decadal Scale ◽  
Effects Of Drought ◽  
Forestry Production ◽  
Ecological Reconstruction ◽  
The Impact ◽  
The Relationship

As the main defoliators of coniferous forests in Shandong Province, China, pine caterpillars (including Dendrolimus suffuscus suffuscus Lajonquiere, D. spectabilis Butler, and D. tabulaeformis Tsai et Liu) have caused substantial forest damage, adverse economic impacts, and losses of ecosystem resources. Therefore, elucidating the effects of drought on the outbreak of these pests is important for promoting forestry production and ecological reconstruction. Accordingly, the aim of the present study was to analyse the spatiotemporal variation of drought in Shandong Province, using the Standard Precipitation Index, and to investigate the impact of drought on the outbreak of pine caterpillar infestations. Future trends in drought and pine caterpillar populations were then estimated using the Hurst exponent. The results showed that: (1) Drought decreased gradually and showed a wetting trend from 1981 to 2012, with frequency decreasing on a decadal scale as follows: 1980s > 1990s > 2000s > 2010s; (2) The total area of pine caterpillar occurrence decreased strongly from 1992 to 2012; (3) Long-term or prolonged drought had a greater positive impact on pine caterpillar outbreak than short-term drought; (4) In the future, a greater portion of the province’s area will experience increased wetting conditions (57%) than increased drought (43%), and the area of pine caterpillar outbreak is estimated to decrease overall. These findings help elucidate the relationship between drought and pine caterpillar outbreak in Shandong Province and, hence, provide a basis for developing preventive measures and plans.

scholarly journals Near-Field Measurement of Six Degrees of Freedom Mining-Induced Tremors in Lower Silesian Copper Basin

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6801
Author(s):  
Krzysztof Fuławka ◽  
Witold Pytel ◽  
Bogumiła Pałac-Walko
Keyword(s):  
Seismic Wave ◽  
Degrees Of Freedom ◽  
Seismic Waves ◽  
Near Field ◽  
High Energy ◽  
Rotational Component ◽  
Empirical Formulas ◽  
Six Degrees Of Freedom ◽  
The Impact

The impact of seismicity on structures is one of the key problems of civil engineering. According to recent knowledge, the reliable analysis should be based on both rotational and translational components of the seismic wave. To determine the six degrees of freedom (6-DoF) characteristic of mining-induced seismicity, two sets of seismic posts were installed in the Lower Silesian Copper Basin, Poland. Long-term continuous 6-DoF measurements were conducted with the use of the R-1 rotational seismometer and EP-300 translational seismometer. In result data collection, the waveforms generated by 39 high-energy seismic events were recorded. The characteristic of the rotational component of the seismic waves were described in terms of their amplitude and frequency characteristics and were compared with translational measurements. The analysis indicated that the characteristic of the rotational component of the seismic wave differs significantly in comparison to translational ones, both in terms of their amplitude and frequency distribution. Also, attenuation of rotational and translational components was qualitatively compared. Finally, the empirical formulas for seismic rotation prediction in the Lower Silesian Copper Basin were developed and validated.

The Drugs and Natural Antioxidants as the Components of Anti-radiation Countermeasures during Cosmic Flights

2017 ◽  
pp. 66-73 ◽  
Author(s):  
И. Ушаков ◽  
I. Ushakov ◽  
М. Васин ◽  
M. Vasin
Keyword(s):  
Solar Activity ◽  
Cosmic Rays ◽  
Radiation Effects ◽  
High Energy ◽  
Galactic Cosmic Rays ◽  
Stress Factors ◽  
Solar Cosmic Rays ◽  
Post Radiation ◽  
The Impact

Radiation situation for cosmonauts over long-term cosmic flights is caused by low-rate radiation of galactic cosmic rays and solar cosmic rays consisting of high-energy proton as well as heavy particles (Z>10) within 1-2 % that is exclusively a threat of stochastic radiation effects (small increase of cancer risk and decrease of mean life span) for men. During interplanetary expedition periods the small probability of raised solar activity there is a threat of exposure to astronauts at doses that cause deterministic radiation effects leading to the development of the disease as a clinical manifestation of radiation injuries,. In a similar scenario it is necessary to have available to cosmic ship anti-radiation countermeasures for cosmonaut protection. Among radioprotective equipment can be provided with radiation protective agents and partial shielding of body separate section providing the best condition for post-radiation repair of radiosensitive body tissues. Preparation B-190 (indralin) is the most perspective from a small numbers of other radioprotectors permitting for men administration. Besides high radioprotective efficacy and large broadness of protective action B-190 is well tolerated including the impact of extrem flight factors. Antiemetic agent latran (ondansetron) is most interesting among preparation for prophylaxis and reduction of prodromal radiation reaction. To accelerate post-radiation hematopoietic recovery after raised solar activity an administration of radiomitigators (riboxin et al.) is substantiated. Neupomax (neupogen) is recommended as a preparation for pathogenesis therapy of acute radiation syndrome. Possible consequences of long-term cosmic voyages for oxidative stress development are taken into consideration. On their basis of nNatural antioxidants, preparations and nutrients radiomodulators, fully qualitative nutrition including vegetable food enriched flavonoids, vitamins C, E and carotene potentially prevent a shorten of cosmonaut biological age induced by solar cosmic rays and galactic cosmic rays and stress factors of long-term cosmic voyages. Radiomodulators are low and non-toxic and have not side effects in recommended doses. Their radioprotective effect is directly induced by adaption reaction on cellular and organismic levels through gene expression modulation and in that way the increase of non-specific body tolerance. The implementation of radiomodulator action is possible through hormesis mechanism.

scholarly journals The long-term effects of space weather on satellite operations

2010 ◽  
Vol 28 (6) ◽  
pp. 1361-1367 ◽  
Author(s):  
D. T. Welling
Keyword(s):  
Background Radiation ◽  
High Energy ◽  
High Energy Particle ◽  
Solar Cycles ◽  
Long Term Effects ◽  
Radiation Background ◽  
Particle Exposure ◽  
Total Lifetime ◽  
The Impact

Abstract. Integrated lifetime radiation damage may cause spacecraft to become more susceptible to operational anomalies by changing material characteristics of electronic components. This study demonstrates and quantifies the impact of these effects by examining the National Oceanic and Atmospheric Administration (NOAA) National Geophysical Data Center (NGDC) satellite anomaly database. Energetic particle data from the Geostationary Operational Environmental Satellites (GOES) is used to construct the total lifetime particle exposure a satellite has received at the epoch of an anomaly. These values are compared to the satellite's chronological age and the average exposure per year (calculated over two solar cycles.) The results show that many anomalies occur on satellites that have received a total lifetime high-energy particle exposure that is disproportionate to their age. In particular, 10.8% of all events occurred on satellites that received over two times more 20 to 40 MeV proton lifetime particle exposure than predicted using an average annual mean. This number inflates to 35.2% for 40 to 80 MeV protons and 33.7% for ≥2 MeV electrons. Overall, 73.5% of all anomalies occurred on a spacecraft that had experienced greater than two times the expected particle exposure for one of the eight particle populations used in this study. Simplistically, this means that the long term radiation background exposure matters, and that if the background radiation is elevated during the satellite's lifetime, the satellite is likely to experience more anomalies than satellites that have not been exposed to the elevated environment.

The impact of intergenerational programs on children and older adults: a review

2017 ◽  
Vol 30 (4) ◽  
pp. 451-468 ◽  
Author(s):  
Maria Rosaria Gualano ◽  
Gianluca Voglino ◽  
Fabrizio Bert ◽  
Robin Thomas ◽  
Elisa Camussi ◽  
...  
Keyword(s):  
Older Adults ◽  
Positive Impact ◽  
Well Being ◽  
Staff Members ◽  
Intergenerational Programs ◽  
Short And Long Term ◽  
The Impact ◽  
Final Selection ◽  
Reporting Data

ABSTRACTBackground:Elderly are at particular risk of social isolation. This condition significantly affects health; on the contrary, social involvement can be extremely advantageous. In this context, intergenerational programs improve interactions between different ages. Then, we conducted a review regarding intergenerational programs, to summarize the effects of these activities on both elderly and children.Methods:Our review followed the PRISMA statements. We considered papers reporting data about intergenerational programs involving children (preschool and elementary) and elderly.Results:The final selection obtained 27 sources. Ten studies evaluated children's outcomes outlining the positive impact of intergenerational programs upon children's perception of elderly. The effects on older participants were variegated considering well-being, depression, self-reported health, and self-esteem. Moreover, the retrieved studies outlined the importance of a careful organization and of a specific training for all staff members. The staff involved in similar programs appeared, overall, highly satisfied.Discussion:The positive impact on children of intergenerational programs is proved at both short- and long-term. Moreover, despite the different outcomes considered and the variable results, these programs resulted overall beneficial on elderly participants. Finally, similar activities resulted feasible even in case of older adults with dementia.

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