Decarbonisation pathways of the cement production process via hydrogen and oxy-combustion

Decarbonising cement production is of profound importance for meeting global greenhouse gas emission reduction targets and mitigating the impact of climate change. This study evaluates various technical options for achieving deep decarbonisation in a clinker production facility by utilising hydrogen (H2) as an alternative fuel to replace fossil fuels and by integrating an oxy-combustion technique with carbon capture and storage (CCS). Using Aspen Plus process simulations, we examined the extent of decarbonisation and assessed the thermal and electrical energy demands. This was achieved by incorporating an amine-absorption-based CO2 capture to a conventional natural gas fuelled reference plant, implementing oxyfuel-combustion of natural gas, and exploring four different scenarios for replacing fossil fuel with H2. In these scenarios, H2 was assumed to be produced through on-site water electrolysis, which also supplied oxygen for oxyfuel combustion, potentially eliminating the need for an air separation unit (ASU). The processes utilizing H2, except for the case of indirectly heated pre-calcination, employed oxyfuel combustion. The results indicate that the natural gas-fuelled oxyfuel-combustion process had the lowest total energy input at 4.92 GJ/t clinker, approximately 35% lower than that of the reference plant. Processes using H2 reduced energy demand by 11% in the H2-d scenario and 33% in the H2-a scenario. However, the process with indirect calcination required 6.24 GJ/t clinker, about 8% more H2 fuel than direct calcination but helped eliminate the need for an ASU. The results also reveal that greater H2 substitutions led to higher total process energy requirements due to the inefficiencies of the electrolysis process. While the H2-using processes could reduce the CO2 generation by up to 559 kgCO2/t clinker, this represents only about 27.6% of the CO2 reductions relative to the reference plant. These findings underscore the limitation of fuel substitution alone in cement production and emphasize the need for innovations in raw materials and the adoption of CCS to achieve deeper decarbonisation in cement industries

On the Renormalization of a Bosonized Version of the Chiral Fermion-Meson Model at Finite Temperature

Feynman's functional formulation of statistical mechanics is used to study the renormalizability of the well known Linear Chiral Sigma Model in the presence of fermionic fields at finite temperature in an alternative way. It is shown that the renormalization conditions coincide with those of the zero temperature model.Comment: 12 pages, no figures, LaTex, reference [17] is updated, to appear in Phys. Lett.

The Establishment of Charter Schools: A Guide to Legal Issues for Legislatures

El ritmo de vida de las personas en la actualidad se ha acelerado a tal punto que no cuentan con el tiempo necesario para realizar actividades esenciales. Destacando principalmente la función de cocinar, la cual resulta extenuante debido al engorroso proceso que implica llevarla a cabo. El proceso comprende el traslado al lugar de compra, la búsqueda de los insumos, la selección de los insumos, las largas colas para pagar, el lavado de los insumos así como el picado de los mismos, entre otras. Por ende, se propone una solución alternativa a este problema, la cual consiste en el delivery a través de la venta online de boxes con insumos frescos sin cocinar picados y en las cantidades exactas de diversos platillos criollos.The rhythm of life of the persons at present has hastened to such a point that they do not count with the necessary time to realize essential activities. Emphasizing principally the function to cook, which turns out to be exhausting due to the bothersome process that implies carrying out it. The process comprises the transfer to the place of buy, the search of the inputs, the selection of the inputs, the long tails to pay, the wash of the inputs as well as stung of the same ones, between others. Therefore, an alternative solution to this problem is proposed, which consists of the delivery through the online sale of boxes with fresh uncooked inputs chopped and the exact quantities of various Creole dishes. This paper seeks to determine the financial viability of the project in question in order to validate the possibility of implementing it in a real-world scenario.Trabajo de investigació

study design of a phase 3 randomized open label multicenter study to evaluate ruxolitinib over bat in patients with corticosteroid refractory chronic graft vs host disease after allogeneic hematopoietic stem cell transplantation reach 3

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Plan de negocio para la implementaci?n de una empresa de consultor?a especializada en turismo

El presente trabajo busca establecer la viabilidad de una empresa de consultor?a especializada en el sector turismo y presentar un plan de negocios para su implementaci?n. Como objetivos se plante?: - Realizar un an?lisis del sector turismo y de la consultor?a a nivel global, regional y nacional. - Determinar las necesidades de consultor?a en el sector turismo en los diferentes niveles de los sectores p?blico y privado. - Dise?ar los productos de consultor?a apropiados para cada uno de los segmentos detectados, con una propuesta de valor acorde con las necesidades y la realidad del negocio. - Dise?ar la estrategia empresarial, y los planes de operaciones y recursos humanos que soporten la prestaci?n del servicio de consultor?a. - Evaluar la viabilidad socioecon?mica del proyecto en un horizonte de cinco a?os

The Chiral Fermion Meson Model at Finite Temperature

We study the chiral fermion meson model which is the well known linear sigma model of Gell-Mann-and-Levy at finite temperature.A modified self-consistent resummation (MSCR) which resums higher order terms in the perturbative expansion is proposed. It is shown that with the MSCR the problem of tachyonic masses is solved, the renormalization of the gap equations is carried out and the Goldstone's theorem is verified. We also apply the method to investigate another known case at high temperature and compare with results found in the literature.Comment: 31 pages, 9 EPS figures. Final version with extended Concluding Remarks section, accepted for publication in Phys. Rev.

Glyph reader app: multisensory stimulation through ICT to intervene literacy disorders in the classroom

This article shows the experience in the implementation of a tool called Glyph Reader, which is an application that has two interfaces, Web and Mobile and that responds to the need for an educational and interactive resource whose main objective is the Multisensory stimulation for literacy training in a population with cognitive disabilities and/specific learning disorder. The design of the activities that this application has is based on the theoretical model of multisensory stimulation Orton Gillingham, which seeks the development of basic skills for decoding isolated words based on a phonetic - graphic analysis of them. The techniques within this model use the basic concepts of intersensory integration of simultaneous visual-auditory-kinesthetic- tactile differentiation (VAKT), to which the Glyph Reader application takes full advantage, by including graphic phonetic recognition and training activities of syllables/words (exercises with symphons and exercises with combinations of consonants or working syllables), which pass from basic levels to complex levels of decoding, necessary for the development of literacy skills. The study sample for software validation is 250 students from the Eustorgio Salgar educational institution, in the municipality of Puerto Colombia, in the department of Atlántico – Colombi

The contribution of rat studies to contemporary knowledge of Major Depressive Disorder: Results from citation analysis

Funding: This study was financed by Animalfree Research—Switzerland, a grant from the Johns Hopkins Center for Alternatives to Animal Testing (CAAT) and by Portuguese National Funds through FCT—Fundação para a Ciência e a Tecnologia, within the CFCUL Unit funding UIDB/00678/2020. TM thanks partial support by CEAUL (funded by FCT—Fundação para a Ciência e a Tecnologia, Portugal, through the project UID/MAT/00006/2019). FP thanks FCT/MCTES for the financial support to CESAM (UIDP/50017/2020 and UIDB/50017/2020), through national funds. Open access publication costs were covered by Animalfree Research-Switzerland and by funding provided by the Ketty and Leif Hjordt Foundation.Major depressive disorder (MDD) is the most severe depression type and one of the leading causes of morbidity worldwide. Animal models are widely used to understand MDD etiology, pathogenesis, and treatment, but the efficacy of this research for patients has barely been systematically evaluated. Such evaluation is important given the resource consumption and ethical concerns incurred by animal use. We used the citation tracking facilities within Web of Science and Scopus to locate citations of original research papers on rats related to MDD published prior to 2013—to allow adequate time for citations—identified in PubMed and Scopus by relevant search terms. Resulting citations were thematically coded in eight categories, and descriptive statistics were calculated. 178 publications describing relevant rat studies were identified. They were cited 8,712 times. More than half (4,633) of their citations were by other animal studies. 794 (less than 10%) were by human medical papers. Citation analysis indicates that rat model research has contributed very little to the contemporary clinical understanding of MDD. This suggests a misuse of limited funding hence supporting a change in allocation of research and development funds targeting this disorder to maximise benefits for patients.Publisher PDFPeer reviewe