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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of radiotracers as tools to determine feed flowrate imbalances and particle size segregation in industrial flotation circuits
    Autorzy:
    Diaz, Francisco
    Barrientos, Nelson
    Powiązania:
    https://bibliotekanauki.pl/articles/24291630.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    radiotracers
    flotation
    particle size segregation
    feed flow distribution
    Opis:
    This publication presents the application of radiotracers in the characterization of industrial flotation circuits. Two examples are showcased: the detection of feed flow rate imbalances and the characterization of particle size segregation in automatic mineral-cutting machines. The feed pulp distribution was determined from the mean residence times. Particle size segregation was measured by sampling the cutting machines (≅ 25 grams samples) using coarse, intermediate, and fine-sized radiotracer particles. Radiotracers were injected into the feed streams and measured at various points of the circuit using nuclear instruments, allowing for non-invasive and real time detection. Results show that in the rougher flotation stage, the feed flow is distributed almost evenly in lines 2 and 3 (approximately 38% of the flow goes to each line) and to a lesser extent towards line 4 (approximately 24%). In lines 1 and 2 of the scavenger stage, a higher percentage of the flow goes towards line 1 (approximately 59%) and a lower percentage towards line 2 (41%). Line 6 of the rougher flotation is the fastest of the circuit (shortest residence time). In addition, the inlet mineral-cutting machine of the rougher stage segregates particles with a bias for fine sizes (11.4 % more fine-sized particles than coarse ones). This work is an example of how radiotracer technology can be applied to improve metal production and processes. Radiotracers provide reliable information to be used in combination with other metallurgical data to properly assess flotation circuits.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 174817
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A sensitivity analysis of kinetic characterizations in continuous flotation circuits under moderate deviations with respect to perfect mixing
    Autorzy:
    Vinnett, Luis
    Pino-Muñoz, Catalina A.
    Yianatos, Juan
    Díaz, Francisco
    Henríquez, Felipe
    Powiązania:
    https://bibliotekanauki.pl/articles/2146941.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetics
    residence time distribution
    perfect mixing
    flotation rate distribution
    industrial flotation circuit
    Opis:
    This paper studies the effect of moderate deviations with respect to perfect mixing on the estimated kinetic parameters in industrial flotation banks. Radioactive tracer tests and mass balance surveys were performed to characterize the mixing regimes and Cu kinetic responses. For three models (Single Rate Constant, Rectangular and Gamma), two approaches to incorporate the residence time distributions (RTD) in the kinetic characterizations of rougher banks were compared: (i) RTDs measured from the radioactive tracer tests; and (ii) pure perfect mixing in each flotation machine. The measured RTDs did not present significant bypass in the evaluated banks. In all cases, comparable model fitting was obtained with both RTD approaches, which indicates that the kinetic models add sufficient flexibility to compensate for moderate biases in the mixing regime. The studied kinetic models showed non-significant differences in the estimated maximum recoveries (R∞), mean (kmean) and median (k50) rate constants when comparing the process modelling from measured RTDs and pure perfect mixing. However, the Gamma model was more sensitive to the RTD assumption in terms of the shapes of the flotation rate distributions. From the results, kinetic characterizations focused only on model fitting, or on R∞ and kmean (or k50) estimations have low sensitivity to the assumption of perfect mixing when the RTDs present moderate deviations with respect to this regime. Special attention must be paid when characterizing floating components as the perfect mixing assumption may bias the shapes of the flotation rate distributions.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152420
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of different redundancy based methods to solve the project scheduling problem with probabilistic activivies duration
    Autorzy:
    Ortiz-Pimiento, Nestor Raul
    Diaz-Serna, Francisco Javier
    Powiązania:
    https://bibliotekanauki.pl/articles/406722.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    project scheduling
    redundancy based methods
    proactive scheduling
    robustness measures
    probabilistic duration
    Opis:
    Redundancy based methods are proactive scheduling methods for solving the Project Scheduling Problem (PSP) with non-deterministic activities duration. The fundamental strategy of these methods is to estimate the activities duration by adding extra time to the original duration. The extra time allows to consider the risks that may affect the activities durations and to reduce the number of adjustments to the baseline generated for the project. In this article, four methods based on redundancies were proposed and compared from two robustness indicators. These indicators were calculated after running a simulation process. On the other hand, linear programming was applied as the solution technique to generate the baselines of 480 projects analyzed. Finally, the results obtained allowed to identify the most adequate method to solve the PSP with probabilistic activity duration and generate robust baselines.
    Źródło:
    Management and Production Engineering Review; 2019, 10, 3; 73--80
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Party System Change in a New Democracy: The Case of Mexico
    Autorzy:
    Díaz Jiménez, Oniel Francisco
    Powiązania:
    https://bibliotekanauki.pl/articles/642955.pdf
    Data publikacji:
    2014
    Wydawca:
    Fundacja Copernicus na rzecz Rozwoju Badań Naukowych
    Tematy:
    Party system change
    competitiveness
    dealignment
    volatility
    fractionalisation
    nationalisation
    Opis:
    Since the end of the last century Mexico has experienced a profound proces of political and electoral change which was reflected in its transition from a dominant party authoritarian regime to a competitive multiparty system. This paper has two parts and a concluding section. The first part focuses on major changes in a number of relevant dimensions of the Mexican party system, including electoral competitiveness, party fractionalisation, electoral volatility, nationalisation, and the aggregate distribution of partisan loyalties among the electorate (macropartisanship) over the last three decades. The analysis is based on aggregate electoral data at the national and the district level, as well as on data from surveys of public opinion. The paper shows important changes in the structure and behaviour of the Mexican electorate, such as increasing partisan de-alignment as well as growing competitiveness, fractionalisation, and nationalisation of the party system. The second part is a brief review of the factors driving the process of political and electoral change in Mexico.
    Źródło:
    The Copernicus Journal of Political Studies; 2014, 1 (5)
    2299-4335
    Pojawia się w:
    The Copernicus Journal of Political Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shakespeare in Galician and Spanish. On the Translation of Puns in Hamlet”
    Autorzy:
    Díaz, Pérez
    Francisco, Javier
    Powiązania:
    https://bibliotekanauki.pl/articles/648160.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Źródło:
    Multicultural Shakespeare: Translation, Appropriation and Performance; 2010, 6-7
    2083-8530
    2300-7605
    Pojawia się w:
    Multicultural Shakespeare: Translation, Appropriation and Performance
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Teachers’ Satisfaction Concerning the Use of ICT in Rural Educational Centers of Andalusia (Spain)
    Autorzy:
    Raso-Sánchez, Francisco
    Cáceres Reche, María Pilar
    Díaz, Inmaculada Aznar
    Powiązania:
    https://bibliotekanauki.pl/articles/16530435.pdf
    Data publikacji:
    2013-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    rural school
    satisfaction
    Information and Communication Technologies
    teaching staff
    IT centers
    Opis:
    This is a study on the use of Information and Communication Technologies (ICT) in education, with a particular emphasis on rural schools, covering topics that range from the insights of teachers on the necessary adaptation of their work methods, to the actual use of ICT in the classroom. To this end, a descriptive methodology is applied through a non-experimental design by means of a survey, targeting a sample of 217 individuals. The objective is to determine the degree of satisfaction of rural teachers of the autonomous community of Andalusia with what concerns the role of ICT and current technology management strategies. The study was carried out from the point of view of teaching and school organization. Above all, the interest lies in determining which aspects of this new reality are more appealing to the teacher, from personal and professional standpoints. Some of the most relevant results and conclusions point out a high degree of satisfaction with the novel possibilities offered by ICT while enhancing teaching and broadening professional relationships. In turn, these same conclusions highlight that the most significant constraints occur at the organizational level (e.g. management, resource allocation), which represents a key aspect for the improvement of these educational centers in the near future.
    Źródło:
    The New Educational Review; 2013, 34; 246-257
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribución de la prensa a la adquisición del vocabulario
    Contribution of the press to the acquisition of vocabulary
    Autorzy:
    Santos Díaz, Inmaculada Clotilde
    Trigo Ibáñez, Ester
    Romero Oliva, Manuel Francisco
    Powiązania:
    https://bibliotekanauki.pl/articles/1395757.pdf
    Data publikacji:
    2021-07-13
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    language teaching
    lexical competence
    media
    sociolinguistics
    Opis:
    The press brings the reader closer not only to the news of a community but also to its language and culture. The objective of this study is to know the relationship between press consumption and lexical competence. Specifically, the weekly time spent by 171 graduate students from Malaga reading the press and its relationship with two lexical tests in Spanish – mother tongue – and French or English – foreign language – will be analysed. The results show that there is no significant relationship between available vocabulary and press consumption. Instead, the relationship is significant with the ability to identify technicalities when the data refer to the foreign language of the informants. These findings invite us to continue promoting didactic applications that integrate press reading both to improve lexical competence and to integrate the sociopragmatic component of the language.
    Źródło:
    Studia Romanica Posnaniensia; 2021, 48, 2; 97-108
    0137-2475
    2084-4158
    Pojawia się w:
    Studia Romanica Posnaniensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organic Micropollutants from an Agricultural Drainage Ditch Contaminate a Shrimp Farm in Sinaloa (Mexico)
    Autorzy:
    Moeder, Monika
    Carranza-Diaz, Otoniel
    López-Angulo, Gabriela
    Ahumada-Santos, Yesmi Patricia
    Schrader, Steffi
    Reemtsma, Thorsten
    Delgado-Vargas, Francisco
    Powiązania:
    https://bibliotekanauki.pl/articles/24201795.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    pesticides
    pharmaceutical residues
    antibiotics
    coliforms
    aquaculture
    agricultural draining ditch
    Opis:
    Among nutrients and pesticides, agricultural draining ditches also transport pollutants discharged with untreated wastewater from the municipalities adjoining the ditch. When the ditch water is used for irrigation and aquaculture, risks for the environment and food production are suggested. For the conducted field study, a shrimp farm in Sinaloa (Mexico) was used to trace organic pollutants (pesticides and pharmaceutical residues) on their way from an agricultural draining ditch to a shrimp farm fed partially by the drain water. The concentrations of pollutants in the drain water ranged from 10 ng L-1 to 453 ng L-1. The pond water of the shrimp farm contained concentrations between <10 ng L-1 and 177 ng L-1. The shrimps were contaminated by pollutants at concentrations between 40 μg kg-1 d.w. (dry weight) to 3.3 mg kg-1 d.w. (fungicide Metalaxyl). Health risks for the cultivated shrimps cannot be excluded because some pesticides are known for their toxic effects to crustaceans. The concentrations of selected antibiotics in the shrimps were low and comparable with those found in the shrimps declared as seawater shrimps from a German supermarket. The incorporation of the antibiotics was probably caused by contact to the wastewater in the shrimp ponds and/or by contaminated shrimp feed. Additionally to the anthropogenic chemicals, coliforms were determined in the water (total coliforms: 30-50 CFU 100 mL-1; fecal coliforms: 0-20 CFU 100 mL-1). These values agree with the Mexican Norm NOM-242-SSA1-2009 representing a microbiological quality of water adequate for aquaculture. The number of coliforms measured in shrimp was higher than in pond water, suggesting bioaccumulation and a potential health risk for consumers.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 143--152
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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