scholarly journals Fundamentals of the Thermal Analysis of Complex Arrangements of Underground Heat Sources

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6813
Author(s):  
Heiner Brakelmann ◽  
George J. Anders ◽  
Piotr Zajac
Keyword(s):  
Urban Areas ◽  
Computational Algorithm ◽  
Point Sources ◽  
Heat Sources ◽  
Power Cables ◽  
Source Modeling ◽  
3 Dimensional ◽  
On Line ◽  
High Level ◽  
Steam Pipes

This paper introduces a new analytical method for the 3-dimensional analysis of heat sources installed underground. Such sources include primarily electric power cables and steam pipes in urban areas. For complex arrangements of the heat sources, the heat transfer and cable rating calculations require the application of numerical methods, which call for high level of expertise and are generally difficult to use. The computational algorithm presented in this paper uses a point sources approach and is an extension of the work published by the authors based on line source modeling, with the goal of simplifying the numerical calculations. The proposed approach is applicable for all heat sources, which are directly buried in a uniform or a partially dried out soil. The method is illustrated by several numerical examples. These examples are used for comparison with the existing standard approach.

Stormwater overflow impacts on the sanitary quality of bathing waters

2007 ◽  
Vol 56 (11) ◽  
pp. 43-50 ◽  
Author(s):  
E. Soyeux ◽  
F. Blanchet ◽  
B. Tisserand
Keyword(s):  
Water Quality ◽  
Urban Areas ◽  
Active Management ◽  
Bathing Water ◽  
Bathing Waters ◽  
Management Concept ◽  
On Line ◽  
Bathing Water Quality ◽  
High Level ◽  
Water Quality Deterioration

New European Directive 2006/7/EC concerning the management of bathing water quality introduces the concept of ‘active management of bathing water sanitary quality’ which could lead to a temporary bathing prohibition in case of short term pollution. For the last three bathing seasons, Veolia has carried out in experimental mode this ‘active management’ concept at more than one hundred bathing sites with various characteristics. Results confirm the high level of microbiological pollution observed in sewer overflows during rainy periods, which is the main cause of bathing water quality deterioration. An on-line treatment solution has been successfully tested. This solution may be used in dense urban areas.

Design and calibration of an IVEM for general 3-dimensional imaging of non-diffracting materials

1992 ◽  
Vol 50 (2) ◽  
pp. 1040-1041
Author(s):  
Neil Rowlands ◽  
Jeff Price ◽  
Michael Kersker ◽  
Seichi Suzuki ◽  
Steve Young ◽  
...  
Keyword(s):  
3D Imaging ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3 Dimensional ◽  
3D Microstructure ◽  
Image Translation ◽  
Digital Correlation ◽  
On Line ◽  
Mechanical Stage ◽  
Projection Angle

Three-dimensional (3D) microstructure visualization on the electron microscope requires that the sample be tilted to different positions to collect a series of projections. This tilting should be performed rapidly for on-line stereo viewing and precisely for off-line tomographic reconstruction. Usually a projection series is collected using mechanical stage tilt alone. The stereo pairs must be viewed off-line and the 60 to 120 tomographic projections must be aligned with fiduciary markers or digital correlation methods. The delay in viewing stereo pairs and the alignment problems in tomographic reconstruction could be eliminated or improved by tilting the beam if such tilt could be accomplished without image translation.A microscope capable of beam tilt with simultaneous image shift to eliminate tilt-induced translation has been investigated for 3D imaging of thick (1 μm) biologic specimens. By tilting the beam above and through the specimen and bringing it back below the specimen, a brightfield image with a projection angle corresponding to the beam tilt angle can be recorded (Fig. 1a).

scholarly journals Patterns of Alcohol Consumption in the PURE Poland Cohort Study and Their Relationship with Health Problems

2021 ◽  
Vol 18 (8) ◽  
pp. 4185
Author(s):  
Katarzyna Zatońska ◽  
Piotr Psikus ◽  
Alicja Basiak-Rasała ◽  
Zuzanna Stępnicka ◽  
Maria Wołyniec ◽  
...  
Keyword(s):  
Cohort Study ◽  
Alcohol Consumption ◽  
Rural Areas ◽  
Urban Areas ◽  
Level Of Education ◽  
Adult Participants ◽  
Frequent Consumption ◽  
Urban And Rural Areas ◽  
Socio Demographic Factors ◽  
High Level

(1) Background: Alcohol is a leading risk factor of premature morbidity and mortality. The objective of this study was to investigate the patterns of alcohol consumption in the PURE Poland cohort study baseline. (2) Methods: A Polish cohort was enrolled in the baseline study in 2007–2010. The study group consisted of 2021 adult participants of urban and rural areas from the Lower Silesia voivodeship in Poland (747 men and 1274 women). (3) Results: In the overall study population, 67.3% were current drinkers, 10.3% were former drinkers, and 22.4% were abstainers. Current use of alcohol products was more prevalent in men (77.2%), people living in urban areas (73.0%), and people with a higher level of education (78.0%). The percentage of current drinkers decreased with increasing age (from 73.4% in 30- to 44-year-olds to 48.8% in participants aged 64 and more). The majority of participants (89.2%) declared a low level of alcohol intake. The chance of high level of intake of alcohol was four times higher in men than in women (OR 4.17; CI 1.64–10.6). The majority of participants (54.6%) declared most frequent consumption of low-alcohol drinks (beer, wine) and 21% declared most frequent consumption of spirits. Current drinkers had almost 1.5-fold higher odds of diabetes and cardiovascular diseases (CVD) than never drinkers (OR 1.49, CI 1.03–2.17; OR 1.66, CI 1.27–2.18, respectively). Former drinkers had higher odds for hypertension and CVD than never drinkers (1.73, CI 1.05–2.85; OR 1.76, CI 1.22–2.53, respectively). (4) Conclusions: In our cohort study, we observed several socio-demographic factors differentiating the patterns of alcohol consumption. The preventive programs should focus predominantly on men, people aged <45 years, and those with a higher level of education.

scholarly journals Oversizing Thread Diagnosis in Tapping Operation

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 537
Author(s):  
Alain Gil Del Val ◽  
Fernando Veiga ◽  
Mariluz Penalva ◽  
Miguel Arizmendi
Keyword(s):  
Control Chart ◽  
Manufacturing Systems ◽  
Spindle Motor ◽  
Multivariate Statistical ◽  
Statistical Process ◽  
Knowing That ◽  
On Line ◽  
High Level ◽  
Screw Threads ◽  
Multivariate Control

Automotive, railway and aerospace sectors require a high level of quality on the thread profiles in their manufacturing systems knowing that the tapping process is a complex manufacturing process and the last operation in a manufacturing cell. Therefore, a multivariate statistical process control chart, for each tap, is presented based on the principal components of the torque signal directly measured from spindle motor drive to diagnosis the thread profile quality. This on-line multivariate control chart has implemented an alarm to avoid defected screw threads (oversized). Therefore, it could work automatically without any operator intervention assessing the thread quality and the safety is guaranteed during the tapping process.

scholarly journals Analysis of Occlusion Effects for Map-Based Self-Localization in Urban Areas

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5196
Author(s):  
Yuki Endo ◽  
Ehsan Javanmardi ◽  
Shunsuke Kamijo
Keyword(s):  
Urban Areas ◽  
Structural Information ◽  
Average Error ◽  
High Definition ◽  
Geometrical Structures ◽  
Real Environment ◽  
Surrounding Environment ◽  
Localization Errors ◽  
Stable Estimation ◽  
High Level

A high-definition (HD) map provides structural information for map-based self-localization, enabling stable estimation in real environments. In urban areas, there are many obstacles, such as buses, that occlude sensor observations, resulting in self-localization errors. However, most of the existing HD map-based self-localization evaluations do not consider sudden significant errors due to obstacles. Instead, they evaluate this in terms of average error over estimated trajectories in an environment with few occlusions. This study evaluated the effects of self-localization estimation on occlusion with synthetically generated obstacles in a real environment. Various patterns of synthetic occlusion enabled the analyses of the effects of self-localization error from various angles. Our experiments showed various characteristics that locations susceptible to obstacles have. For example, we found that occlusion in intersections tends to increase self-localization errors. In addition, we analyzed the geometrical structures of a surrounding environment in high-level error cases and low-level error cases with occlusions. As a result, we suggested the concept that the real environment should have to achieve robust self-localization under occlusion conditions.

scholarly journals ACADEMIC SUCCESS IN THE CONTEXT OF COMPETENCE APPROACH

1970 ◽  
Vol 15 (1) ◽  
Author(s):  
Liudmyla M. Dybkova
Keyword(s):  
Academic Success ◽  
Modern Society ◽  
Innovative Approach ◽  
Educational Activity ◽  
Educational Achievements ◽  
Methods Of Evaluation ◽  
Cultural Processes ◽  
On Line ◽  
High Level ◽  
Political Economic

The article is devoted the problem of evaluation of results of students educational activity in the context of competence approach. Research actuality is conditioned by socio-political, economic and cultural processes which take place in modern society under act of globalization. These processes require from the system of education an innovative approach in preparation of future specialists. Students acquisition of high level competences, selected in the on-line training in preparation for the proper speciality, will provide them with permanent update of knowledges, succesful finding of decisions for problem tasks, independence, selfefficiency while implementation of their professional duties. Existent forms and methods of evaluation of educational achievements are complemented and approved within the framework of the competence approach.

scholarly journals An Assessment of the Reliability of the NIGNET Data

2019 ◽  
Vol 3 (1) ◽  
pp. 18-29
Author(s):  
E. G. Ayodele ◽  
C. J. Okolie ◽  
O. A. Mayaki
Keyword(s):  
National Development ◽  
Accurate Information ◽  
Positional Accuracy ◽  
Data Archiving ◽  
Practical Applications ◽  
3 Dimensional ◽  
Gnss Network ◽  
High Level ◽  
Gnss Data ◽  
Geodetic Reference Frame

The Nigerian Geodetic Reference Frame is defined by a number of Continuously Operating Reference Stations (CORS) that constitute the Nigerian GNSS Network (NIGNET). NIGNET is essential for planning and national development with the main goal of ensuring consistency in the geodetic framework both nationally and internationally. Currently, the strength of the network in terms of data reliability has not been adequately studied due to the fact that research into CORS in Nigeria is just evolving, which constitutes a limitation in its applications. Therefore, the aim of this research is to explore the reliability of the 3-dimensional coordinates of NIGNET to inform usability and adequacy for both scientific and practical applications. In particular, this study examines if the 3-dimensional coordinates of NIGNET are equally reliable in terms of positional accuracy. Accordingly, this study utilised GNSS data collected over a period of six years (2011 – 2016) from the network to compute the daily geocentric coordinates of the stations. Exploratory and statistical data analysis techniques were used to understand the magnitude of the errors and the accuracy level in the 3-dimensional coordinates. For this purpose, accuracy metrics such as standard deviation (𝜎), standard error (𝑆𝐸) and root mean square error (RMSE) were computed. While One-way ANOVA was conducted to explore the coordinate differences. The results obtained showed that SE and RMSE ranged from 13.00 − 56.50𝑚𝑚 and 14.38 − 73.16𝑚𝑚 respectively, which signifies high accuracy. Overall, while 88% of the network showed a high level of positional accuracy, the reliability has been compromised due to excessive gaps in the data archiving. Therefore, due attention must be given to NIGNET to achieve its purpose in the provision of accurate information for various geospatial applications. Also, any efforts directed at understanding the practical implications of NIGNET must be well-embraced for the realization of its set objectives.

scholarly journals Tecnologias digitais no ensino de história e valorização do patrimônio cultural da Amazônia brasileira / Digital Technologies in History Teaching and Valorization of Cultural Heritage in Brazilian Amazon

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Benedito Walderlino De Souza Silva
Keyword(s):  
Cultural Heritage ◽  
Urban Areas ◽  
Teaching And Learning ◽  
Digital Technologies ◽  
Brazilian Amazon ◽  
Starting Point ◽  
Cultural Appreciation ◽  
On Line ◽  
America Latina ◽  
Artistic Heritage

ABSTRACTThis article focuses on conceptual and methodological issues concerning the contribution that digital technologies can provide to School education in the context of the teaching and learning of history in matters related to cultural heritage process. Brazil has the “Instituto do Patrimônio Histórico e Artístico Nacional” (Institute of National Historical and Artistic Heritage) to implement public policies in order to to preserve their culture. In partnership with the “Universidade Federal do Pará” (Federal University of Pará), the unit of the institute in the state of Pará has developed a tool of heritage education called “Ver-o-Site”, an online page with the objective of increasing the cultural appreciation of Ver-o-Peso, the largest free fair in Latin America, a cultural and touristical symbol, and also the starting point of this state capital, the city of Belém. As we evaluate the considerable importance that digital technologies like this have on students' lives, creating new forms and speed of access and sharing of information, we consider that educators must use them as educational tools. With the Ver-oSite, you can work aspects of colonial occupation process, historical, economic and social development of urban areas in the Brazilian Amazon, as well as the space that places like the Ver-o-Peso occupy in the cultural heritage of inhabitants of cities like Belém. Such action aims to strengthen the role of social formation of the school with students in the digital age.RESUMOEste trabalho objetiva discutir fundamentos conceituais e teórico-metodológicos relativos à contribuição que tecnologias digitais podem fornecer a educação escolar no contexto do processo de ensino-aprendizagem da disciplina história em assuntos relacionados ao patrimônio cultural. O Brasil conta com o Instituto do Patrimônio Histórico e Artístico Nacional para executar políticas públicas de preservação de sua cultura. Em parceria com a Universidade Federal do Pará, a unidade do instituto no Estado Pará desenvolveu uma ferramenta de educação patrimonial chamada Ver-o-Site, uma página on-line voltada à valorização cultural do Ver-o-Peso, a maior feira livre da América Latina, símbolo cultural, turísti-co e ponto de origem da capital deste estado, a cidade de Belém. Avaliando o espaço considerável que tecnologias digitais como esta têm na vida dos alunos, gerando novas formas e velocidade de acesso e socialização de informação, pondera-se que os educadores devam utilizá-las como ferramentas educativas. Com o Ver-o-Site, pode-se trabalhar aspectos do proces-so de ocupação colonial, formação histórica, econômica e social de núcleos urbanos da Amazônia brasileira, bem como o espaço que lugares como o Ver-o-Peso ocupam no patrimônio cultural de habitantes de cidades como Belém. Tal ação visa fortalecer o papel de formação social da escola junto aos alunos na era digital. Contato principal: [email protected]

scholarly journals Modelling constraints on the emission inventory and on vertical dispersion for CO and SO<sub>2</sub> in the Mexico City Metropolitan Area using Solar FTIR and zenith sky UV spectroscopy

2007 ◽  
Vol 7 (3) ◽  
pp. 781-801 ◽  
Author(s):  
B. de Foy ◽  
W. Lei ◽  
M. Zavala ◽  
R. Volkamer ◽  
J. Samuelsson ◽  
...  
Keyword(s):  
Power Plant ◽  
Mexico City ◽  
Urban Areas ◽  
Emission Inventory ◽  
Uv Spectroscopy ◽  
Transport Processes ◽  
Point Sources ◽  
Large Power ◽  
Vertical Dispersion ◽  
Current Emission

Abstract. Emissions of air pollutants in and around urban areas lead to negative health impacts on the population. To estimate these impacts, it is important to know the sources and transport mechanisms of the pollutants accurately. Mexico City has a large urban fleet in a topographically constrained basin leading to high levels of carbon monoxide (CO). Large point sources of sulfur dioxide (SO2) surrounding the basin lead to episodes with high concentrations. An Eulerian grid model (CAMx) and a particle trajectory model (FLEXPART) are used to evaluate the estimates of CO and SO2 in the current emission inventory using mesoscale meteorological simulations from MM5. Vertical column measurements of CO are used to constrain the total amount of emitted CO in the model and to identify the most appropriate vertical dispersion scheme. Zenith sky UV spectroscopy is used to estimate the emissions of SO2 from a large power plant and the Popocatépetl volcano. Results suggest that the models are able to identify correctly large point sources and that both the power plant and the volcano impact the MCMA. Modelled concentrations of CO based on the current emission inventory match observations suggesting that the current total emissions estimate is correct. Possible adjustments to the spatial and temporal distribution can be inferred from model results. Accurate source and dispersion modelling provides feedback for development of the emission inventory, verification of transport processes in air quality models and guidance for policy decisions.

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