1,721,556 research outputs found
Combining sewage sludge and algae biomass to a valuable biosolid composite: Literature review on treatment and applications
Full text linkIncreasing amount of sewage sludge is produced in Romania and there is stricter requirement to treat and dispose sewage sludge after the EU Landfill Directive and Sludge Directive applied in Europe. In this report, the sludge issue is briefly reviewed from scientific and engineering points of views, with focus on sterilisation of biosolids. Based on the review and the experiences from Norway and other countries in Europe, it is believed that sewage sludge and marine algae from the coast of the Romanian Black Sea can be combined and processed to fulfil the stringent requirements for land applications. However, further studies are required to highlight the possibilities and challenges with such a co-treatment of sludge and alga biomass.ASSOCIATION OF PROTECTION OF THE HUMAN BEING AND THE ENVIRONMENT FOR A SUSTAINABLE DEVELOPMENT IN THE WORLD - ECO
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Salient parameters affecting the performance of foamed geopolymers as sustainable insulating materials
No full textThe carbon footprint of buildings is mainly attributed to the embodied carbon of building materials and their hygrothermal performance. In recent years, the search for materials with low gray energy and better hygrothermal performance has increased. Foamed geopolymers are among the materials that are attracting a lot of attention. Their high hygrothermal performance and the fact that they can be synthesized from abundant earth elements at ambient hygrothermal conditions are the main reasons for their growing popularity. Foamed geopolymers can also be produced from commonly available industrial wastes providing new opportunities for a circular economy. Many studies have been done to engineer these materials for specific applications in water purification, catalysis, thermal insulation, hazardous waste encapsulation, and acoustic isolation. Several recent papers have been discussing the mechanical features of geopolymers. Recent reviews also focus on the processing, applications, and properties of foamed geopolymers. However, a review about the impact of manufacturing parameters on porosity, pore nucleation, and pore parameters is still missing. These parameters determine the intrinsic and extrinsic thermal isolation properties of foamed geopolymers. This article aims to address this research gap. The effects of pore-forming agents, molar ratios of oxides, water, curing temperature, and pH on the microstructure of foamed geopolymers are discussed in this paper. The influences of these factors on intrinsic and extrinsic pore parameters are presented
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The reaction of Meldrum's acid derivatives with conjugated azoalkenes: a convenient route to 1-amino-1H-pyrrol-2(3H)-ones
No full textReaction of heteroaryl thiols with conjugated azoalkenes: regioselective preparation of 4-(heteroarylthio)-1H-pyrazol-5(2H)-ones. X-Ray crystal structures of methyl 2-((pyrimid-2-yl)thio)acetoacetate (aminocarbonyl)hydrazone and 1(aminocarbonyl)-3-methyl-4-((pyrimid-2-yl)thio)-1H-pyrazol-5(2H)-one
No full textThe dependence of thermophysical and hygroscopic properties of macro-porous geopolymers on Si/Al
No full textAerated geopolymers are low calcium alkali-activated materials with induced porosity. These materials are reported to have huge potential to modulate the thermal and hydric conditions within buildings. The performance of these materials as a passive hygrothermal controller depends on various factors. However, studies in this area are limited. This study investigates how Si/Al ratio impacts the thermal and hydric features of foamed geopolymers. The thermal conductivity of the samples increased as the Si/Al ratio increased. While the vapor permeability of the materials decreases with rising silicon content. This is because the pore network declines with Si/Al. The vapor permeability of the samples has values ranging between 7.55 to 6.37(10−11)(Kg/m.s.Pa). The moisture buffer capacity also follows a similar trend with values from 4.17 to 6.81(g/m2%RH). The moisture absorption capacity also reduces when the Si/Al increases. Therefore, Si/Al ratio is a key factor that needs to be controlled to engineer aerated geopolymers for passive house applications
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