13 research outputs found
Gene Expression Programming Model for Tribological Behavior of Novel SiC–ZrO2–Al Hybrid Composites
No full textIn order to improve product format quality and material flexibility, variety of application, and cost-effectiveness, SiC, ZrO2, and Al hybrid composites were manufactured in the research utilizing the powder metallurgy (PM) technique. A model was created to predict the tribological behavior of SiC–ZrO2–Al hybrid composites using statistical data analysis and gene expression programming (GEP) based on artificial intelligence. For the purpose of examining the impact of zirconia concentration, sliding distance, and applied stress on the wear behavior of hybrid composites, a comprehensive factor design of experiments was used. The developed GEP model was sufficiently robust to achieve extremely high accuracy in the prediction of the determine coefficient (R2), the root mean square error (RMSE), and the root relative square error (RRSE). The maximum state of the RMSE was 0.4357 for the GEP-1 (w1) model and the lowest state was 0.7591 for the GEP-4 (w1) model, while the maximum state of the RRSE was 0.4357 for the GEP-1 (w1) model and the minimum state was 0.3115 for the GEP-3 model (w1)
L’autre-moi de Roland Barthes
No full textThe last years of Barthes's life are influenced by the mourning and the death of his mother. He commented under her photo at the Winter's Garden. Then he expressed the love he had for his family by describing their absence. By recalling those loved ones, the writer is in truth looking for his own identity. The author was introduced to the novel through the poetic instant or the haiku and came back to the body of the artist, just like a literature whose death he fears. He tries so, just like the phoenix, to reborn from the ashes by taking the path of romantic creation and repeating the sounds of the words Roland Barthes.Los últimos años de la vida de Roland Barthes están marcados por el duelo tras la muerte de su madre. Comentó la fotografía del Jardin d'hiver en La Cámara lúcida. Más tarde expresó el amor que sentía por su familia describiendo su ausencia. Al recordar a sus seres queridos, ciertamente, el escritor se encuentra a la búsqueda de su propia identidad. Barthes se introdujo en la novela a través del instante poético o del haiku y regresó al cuerpo del artista, de la misma forma que una literatura que teme su muerte. Intentó así, como un ave fenix, renacer de sus cenizas retomando el camino de la creación romántica y repitiendo los sonidos de las palabras Roland Barthes.Les dernières années de la vie de Barthes sont marquées par le deuil et la disparition d'une mère dont il légende la photo au Jardin d'hiver. Il exprime alors l'amour qu'il porte aux siens en décrivant leur absence. En rappelant ces êtres qui lui sont chers, l'écrivain est en vérité à la recherche de sa propre identité. L'auteur s'initie au roman par l'instantané poétique ou le haïku et redonne corps à l'artiste, tout comme à une littérature dont il craint la mort. Il tente ainsi, tout comme le phénix, de renaître de ses cendres en empruntant la voie de la création romanesque et en reprenant les sons des mots Roland Barthes
Energy-Aware Permutation Flow Shop Scheduling Problem Considering the Inventory, Tardiness and Energy Costs
No full textMathematical modeling of a bi-objective hub location-routing problem for rapid transit networks
No full textThis paper aims to develop a mathematical model for rapid transit networks based on a hub and spoke model, comprising stopovers (stations) in the hub and non-hub (spoke) alignments. Due to the use of rapid transit systems in both the hub-level sub-network (i.e., the network among the hub nodes) and the spoke-level sub-network (i.e., the network which connect the spoke nodes to each other and to the hub nodes), the proposed model relaxes some of the usual assumptions in classical hub location models. In the proposed model, the transshipment of flows among the spoke nodes is possible, the setup costs of all the hub and spoke nodes and edges are considerable, and both hub and spoke edges have capacity constraints. In addition to the network infrastructure designed through decisions about the locations of the hub and spoke nodes and edges, the hub and spoke rapid transit lines are determined along with the routes of demands in those lines. The model incorporates profit and service time criteria. An adaptive large neighborhood search solution algorithm is developed whose efficiency is proved by the computational results. Some managerial insight is also provided through the analysis of the resulting networks under various parameter settings
A Fuzzy Two-Echelon Model to Optimize Energy Consumption in an Urban Logistics Network with Electric Vehicles
No full textWith the increase in pollutants, the need to use electric vehicles (EVs) in various urban logistics activities is an increasingly important issue. Currently, there are issues with the efficiency of transport companies in recognizing the effects of uncertain factors in daily logistics operations. Thus, this research proposes a novel fuzzy two-echelon vehicle routing problem involving heterogeneous fleet EVs and internal combustion vehicles (ICVs). The first echelon is recyclable wastes collected from waste pickup points and transported to the primary centers by EVs. The second echelon is transporting recyclable wastes to recycling centers by ICVs. In the proposed models, fuzzy numbers are used to express the rate and energy consumption depending on the amount of load, vehicle speed, and recyclable waste. In addition, a penalty cost of the time windows is considered in both echelons. The models are solved by CPLEX and two meta-heuristic algorithms, gray wolf optimizer (GWO) and tabu search (TS), based on different instance sizes. The results show the efficiency of the proposed algorithms
ORIGINAL ARTICLE Corresponding Author Effects of nitrogen fertilization on nitrogen use efficiency of Coker (flue-cured) tobacco inoculated with Azotobacter chroococcum
No full textNosratabad: Effects of nitrogen fertilization on nitrogen use efficiency of Coker (flue-cured) tobacco inoculated with Azotobacter chroococcum ABSTRACT A field study was carried out during a two-year period (2009 to 2010) in order to investigate yield and nitrogen use efficiency of Coker 347 (flue-cured) tobacco plant inoculated with Azotobacter chroococcum at various levels of nitrogen (N) fertilization. In a factorial trial and randomized completely block design, four levels of N fertilizer (non fertilizer, 15, 30 and 45 kg.ha -1 ) and three levels of Azotobacter chroococcum (without inoculation, 1 and 2 kg.ha -1 ) with three replications per treatments were added. The results showed that simultaneous application of N fertilizer and Azotobacter significantly increased leaf area index (LAI). Furthermore, inoculation tobacco root with bacterium had significant effect on N harvest index only in priming. Application of N fertilizer and Azotobacter significantly decreased N efficiencies (except agronomic efficiency and recovery efficiency in tip that this decrease was not significant). The regression model for LAI showed that this parameter had significant positive correlation with quantitative characteristics (plant height, leaf length, leaf width and leaf number). Furthermore, the regression models for N efficiencies had significant positive correlation with yield and significant negative correlation with N. Generally, N use efficiencies are low in tobacco. Solving this problem only need promoting long-term management strategies
OR models in urban service facility location : a critical review of applications and future developments
No full text© 2018, Elsevier. The attached document (embargoed until 29/07/2020) is an author produced version of a paper published in European Journal of Operational Research uploaded in accordance with the publisher’s self- archiving policy. The final published version (version of record) is available online at https://doi.org/10.1016/j.ejor.2018.07.036. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it
Global, regional, and national age-sex-specific mortality and life expectancy, 1950–2017: a systematic analysis for the Global Burden of Disease Study 2017
No full text© 2018 The Author(s). Background: Assessments of age-specifc mortality and life expectancy have been done by the UN Population Division, Department of Economics and Social Afairs (UNPOP), the United States Census Bureau, WHO, and as part of previous iterations of the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD). Previous iterations of the GBD used population estimates from UNPOP, which were not derived in a way that was internally consistent with the estimates of the numbers of deaths in the GBD. The present iteration of the GBD, GBD 2017, improves on previous assessments and provides timely estimates of the mortality experience of populations globally. Methods: The GBD uses all available data to produce estimates of mortality rates between 1950 and 2017 for 23 age groups, both sexes, and 918 locations, including 195 countries and territories and subnational locations for 16 countries. Data used include vital registration systems, sample registration systems, household surveys (complete birth histories, summary birth histories, sibling histories), censuses (summary birth histories, household deaths), and Demographic Surveillance Sites. In total, this analysis used 8259 data sources. Estimates of the probability of death between birth and the age of 5 years and between ages 15 and 60 years are generated and then input into a model life table system to produce complete life tables for all locations and years. Fatal discontinuities and mortality due to HIV/AIDS are analysed separately and then incorporated into the estimation. We analyse the relationship between age-specifc mortality and development status using the Socio-demographic Index, a composite measure based on fertility under the age of 25 years, education, and income. There are four main methodological improvements in GBD 2017 compared with GBD 2016: 622 additional data sources have been incorporated; new estimates of population, generated by the GBD study, are used; statistical methods used in diferent components of the analysis have been further standardised and improved; and the analysis has been extended backwards in time by two decades to start in 1950. Findings: Globally, 18·7% (95% uncertainty interval 18·4-19·0) of deaths were registered in 1950 and that proportion has been steadily increasing since, with 58·8% (58·2-59·3) of all deaths being registered in 2015. At the global level, between 1950 and 2017, life expectancy increased from 48·1 years (46·5-49·6) to 70·5 years (70·1-70·8) for men and from 52·9 years (51·7-54·0) to 75·6 years (75·3-75·9) for women. Despite this overall progress, there remains substantial variation in life expectancy at birth in 2017, which ranges from 49·1 years (46·5-51·7) for men in the Central African Republic to 87·6 years (86·9-88·1) among women in Singapore. The greatest progress across age groups was for children younger than 5 years; under-5 mortality dropped from 216·0 deaths (196·3-238·1) per 1000 livebirths in 1950 to 38·9 deaths (35·6-42·83) per 1000 livebirths in 2017, with huge reductions across countries. Nevertheless, there were still 5·4 million (5·2-5·6) deaths among children younger than 5 years in the world in 2017. Progress has been less pronounced and more variable for adults, especially for adult males, who had stagnant or increasing mortality rates in several countries. The gap between male and female life expectancy between 1950 and 2017, while relatively stable at the global level, shows distinctive patterns across super-regions and has consistently been the largest in central Europe, eastern Europe, and central Asia, and smallest in south Asia. Performance was also variable across countries and time in observed mortality rates compared with those expected on the basis of development. Interpretation: This analysis of age-sex-specifc mortality shows that there are remarkably complex patterns in population mortality across countries. The fndings of this study highlight global successes, such as the large decline in under-5 mortality, which refects signifcant local, national, and global commitment and investment over several decades. However, they also bring attention to mortality patterns that are a cause for concern, particularly among adult men and, to a lesser extent, women, whose mortality rates have stagnated in many countries over the time period of this study, and in some cases are increasing
