scholarly journals Physical and Hydraulic Properties of Porous Concrete

2021 ◽  
Vol 13 (19) ◽  
pp. 10562
Author(s):  
Carlos Sánchez-Mendieta ◽  
Juan Jose Galán ◽  
Isabel Martinez-Lage
Keyword(s):  
Hydraulic Properties ◽  
Compaction Pressure ◽  
Experimental Phase ◽  
Porous Concrete ◽  
High Incidence ◽  
Storm Drainage ◽  
Main Components ◽  
Definition Of ◽  
Potential Use

The work presented includes a review of the state of art of porous concrete. Its purpose is to evaluate the potential use of porous concrete in constructions where the level of surface runoff justifies it. A review of the literature presented here has been necessary where parameters of special consideration have been defined in the dosage of permeable mixtures. The study includes the definition of porous concrete in terms of its main components: cement, coarse aggregate, water, additives, and sand, in little or no quantity, to cause the generation of an effective content of interconnected voids that allow rapid storm drainage. Given the reports of variables of high incidence in the mechanical behavior of porous concrete (resistance/permeability relationship), an investigation is warranted to synthesize the effects of the variables in the preparation of the mixture: water–cement ratio, granulometry, and morphology of the aggregates, compaction pressure, and curing techniques, among others. Likewise, the protocols for the characterization of porous concrete and additional aspects relevant to support the experimental phase are exposed, constituting a reference or anchor point for developing technologies associated with the manufacture of this material and the possibilities of its implementation in constructions.

scholarly journals Characterization of hemicelluloses from leaves and tops of the CC 8475, CC 8592, and V 7151 varieties of sugarcane (Saccharum officinarum L

DYNA ◽  
2019 ◽  
Vol 86 (210) ◽  
pp. 98-107
Author(s):  
Luz Marina Flórez Pardo ◽  
Andrea González Córdoba ◽  
Jorge Enrique López Galán
Keyword(s):  
Nmr Spectroscopy ◽  
Saccharum Officinarum ◽  
Sodium Chlorite ◽  
Bioethanol Production ◽  
Valle Del Cauca ◽  
Main Components ◽  
Holocellulose Content ◽  
Potential Use

In this research, the types of hemicellulose that predominate in the leaves and tops of the three most cultivated varieties (CC 8475, CC 8592, V 7151) of sugarcane (Saccharum officinarum L.) in Valle del Cauca, Colombia were determined. Hemicellulose analyses were performed after delignification with sodium chlorite and extraction with 18% NaOH and 24% KOH containing 0.26 M NaBH4. The main components of hemicellulose were identified via FTIR and NMR spectroscopy, and monomeric sugars were identified via HPLC. Hemicellulose A composed of arabinoxylans, glucomannans and arabinogalactactans and hemicellulose B primarily composed of arabinoxylans were extracted. The hemicelluloses of the Colombian varieties were more stable against heat than those of the Venezuelan variety. The results of this project allowed discovery of the potential use of agricultural sugarcane residues for bioethanol production because they have a holocellulose content of more than 60%.

The CREC Fluidized Riser Simulator. Characterization of Mixing Patterns

2003 ◽  
Vol 1 (1) ◽  
Author(s):  
Jason M Ginsburg ◽  
Ahmet Pekediz ◽  
Hugo Ignacio de Lasa
Keyword(s):  
Mixing Time ◽  
Mixing Times ◽  
Gas Mixing ◽  
Velocity Measurements ◽  
Scale Unit ◽  
Mixing Patterns ◽  
Definition Of ◽  
Gas Recirculation ◽  
Potential Use

The CREC Riser Simulator Reactor is a new laboratory scale unit that was invented at CREC-UWO (de Lasa, 1991). It was specially designed for catalyst testing and kinetic modeling under the conditions of riser and downer reactors. Preliminary work on mixing patterns in the Riser Simulator was already effected by our group using a helium tracer and a constant temperature hot wire anemometer (Pekediz et al, 1993) with both of these devices placed in the outer reactor annulus. However and given the possible ambiguity of the mixing patterns established with these data, helium tracer was injected in the present study into the central catalyst basket, while velocity measurements were effected in the outer annulus. This methodology allowed the definition of effective gas mixing time and gas superficial velocities at various reactor pressures and impeller speeds with increased confidence. This study found that gas mixing times corresponding to high gas recirculation rates in a CREC Riser Simulator occur over impeller rotational speeds ranging from 3000-6000 rpm and total reactor pressures ranging from 1-5 atm. With this end, gas mixing patterns in a Riser Simulator represent a well mixed unit, and thus, the importance of the Riser Simulator can be realized in the context of its potential use for gas-solid reaction kinetics.

COMPETENCE APPROACH IN EUROPEAN PUBLIC ADMINISTRATION: ESSENCE AND DEVELOPMENT TRENDS (ARCHETYPAL ASPECT)

2018 ◽  
Vol 1 (14) ◽  
pp. 132-143
Author(s):  
Martha Ivanivna Karpa
Keyword(s):  
Public Administration ◽  
Good Governance ◽  
Public Institutions ◽  
Public Authorities ◽  
European Public ◽  
Territorial Organization ◽  
Characteristic Features ◽  
State And Local ◽  
Main Components ◽  
Definition Of

The article reveals the main features of the competence approach in the practice of European public administration. The features of the competence approach in public administration are determined on the basis of analysis of the basic concepts of public administration. In the dynamics of the formation and development of popular theories of interaction between state and local authorities, such as the theory of a free community, community (public) and public and state (the theory of municipal dualism), we can trace a number of characteristic features of a competency approach, which manifests itself both through the general theoretical relations and manifestations, and through the practice of coexistence of public authorities. There is a problem of definition and distribution of public functions as a prerequisite for defining and shaping the competences of public institutions. An important issue in the context of a competent approach is the institutional consolidation of functions in the context of the existence of the basic models of territorial organization of power. In each of the varieties of the Governance concept (Responsive Governance concept, Democratic Governance concept, Good Governance concept), the specifics of the use of competencies are defined. The archetypal symbols in the European public administration are singled out using the analysis of competence in public administration in its main constituents. A brief description of the archetypal aspect of European public administration is given. The main components of competence are shown in connection with the existing archetypal symbols and the characteristic trends of their development. Their connection is shown according to the scheme “the entity component (who?) — the object component (what?) — the administrative component (how?) — the basis (in what environment?)”. Concerning the trends of development of a competence approach in the context of practice and theory of public administration, it is determined that modern concepts of public administration are characterized by shifting the balance between state and public institutions to the sphere of common goals and tasks, and thus responsibility. The joint activity of all subjects of society requires new forms of cooperation, definition of the spheres and subjects of each entity’s activity for effective cooperation, distribution of functions and competences of the entities, formation and consolidation of their status characteristics.

scholarly journals Mechanical strength and hydraulic properties of modified porous concrete mixtures

2021 ◽  
Vol 1895 (1) ◽  
pp. 012027
Author(s):  
Hussein J. Almansori ◽  
Adnan Al-Sibahy ◽  
Basim Al-Humeidawi
Keyword(s):  
Mechanical Strength ◽  
Hydraulic Properties ◽  
Porous Concrete ◽  
Concrete Mixtures

Value assessment of antimicrobials and the implications for development, access, and funding of effective treatments: Australian stakeholder perspective

2020 ◽  
pp. 1-7
Author(s):  
Nadine T. Hillock ◽  
Tracy L. Merlin ◽  
Jonathan Karnon ◽  
John Turnidge ◽  
Jaklin Eliott
Keyword(s):  
Cost Effectiveness ◽  
Healthcare Resource ◽  
Economic Evaluations ◽  
Value Assessment ◽  
Antimicrobial Drugs ◽  
Policy Makers ◽  
Stakeholder Perspective ◽  
Definition Of ◽  
The Impact ◽  
Potential Use

Abstract Background The frameworks used by Health Technology Assessment (HTA) agencies for value assessment of medicines aim to optimize healthcare resource allocation. However, they may not be effective at capturing the value of antimicrobial drugs. Objectives To analyze stakeholder perceptions regarding how antimicrobials are assessed for value for reimbursement purposes and how the Australian HTA framework accommodates the unique attributes of antimicrobials in cost-effectiveness evaluation. Methods Eighteen individuals representing the pharmaceutical industry or policy-makers were interviewed. Interviews were transcribed verbatim, coded, and thematically analyzed. Results Key emergent themes were that reimbursement decision-making should consider the antibiotic spectrum when assessing value, risk of shortages, the impact of procurement processes on low-priced comparators, and the need for methodological transparency when antimicrobials are incorporated into the economic evaluation of other treatments. Conclusions Participants agreed that the current HTA framework for antimicrobial value assessment is inadequate to properly inform funding decisions, as the contemporary definition of cost-effectiveness fails to explicitly incorporate the risk of future resistance. Policy-makers were uncertain about how to incorporate future resistance into economic evaluations without a systematic method to capture costs avoided due to good stewardship. Lacking financial reward for the benefits of narrower-spectrum antimicrobials, companies will likely focus on developing broad-spectrum agents with wider potential use. The perceived risks of shortages have influenced the funding of generic antimicrobials in Australia, with policy-makers suggesting a willingness to pay more for assured supply. Although antibiotics often underpin the effectiveness of other medicines, it is unclear how this is incorporated into economic models.

scholarly journals Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2313
Author(s):  
Maria Luisa Beconcini ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini
Keyword(s):  
Shear Behavior ◽  
Stone Masonry ◽  
Masonry Walls ◽  
Mechanical Parameters ◽  
In Situ Tests ◽  
Capacity Curves ◽  
Historical Structures ◽  
Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

Fundamental relations and identities of fuzzy hyperalgebras

2021 ◽  
pp. 1-10
Author(s):  
Narjes Firouzkouhi ◽  
Abbas Amini ◽  
Chun Cheng ◽  
Mehdi Soleymani ◽  
Bijan Davvaz
Keyword(s):  
Universal Algebra ◽  
Equivalence Relation ◽  
Polynomial Function ◽  
Equivalence Relations ◽  
Fundamental Relation ◽  
Term Function ◽  
Biological Phenomena ◽  
Definition Of

Inspired by fuzzy hyperalgebras and fuzzy polynomial function (term function), some homomorphism properties of fundamental relation on fuzzy hyperalgebras are conveyed. The obtained relations of fuzzy hyperalgebra are utilized for certain applications, i.e., biological phenomena and genetics along with some elucidatory examples presenting various aspects of fuzzy hyperalgebras. Then, by considering the definition of identities (weak and strong) as a class of fuzzy polynomial function, the smallest equivalence relation (fundamental relation) is obtained which is an important tool for fuzzy hyperalgebraic systems. Through the characterization of these equivalence relations of a fuzzy hyperalgebra, we assign the smallest equivalence relation α i 1 i 2 ∗ on a fuzzy hyperalgebra via identities where the factor hyperalgebra is a universal algebra. We extend and improve the identities on fuzzy hyperalgebras and characterize the smallest equivalence relation α J ∗ on the set of strong identities.

scholarly journals Genomic Tackling of Human Satellite DNA: Breaking Barriers through Time

2021 ◽  
Vol 22 (9) ◽  
pp. 4707
Author(s):  
Mariana Lopes ◽  
Sandra Louzada ◽  
Margarida Gama-Carvalho ◽  
Raquel Chaves
Keyword(s):  
Human Genome ◽  
Satellite Dna ◽  
Repetitive Sequences ◽  
Nucleotide Composition ◽  
Genomic Component ◽  
Genomic Studies ◽  
Human Genomic ◽  
Definition Of ◽  
High Degree

(Peri)centromeric repetitive sequences and, more specifically, satellite DNA (satDNA) sequences, constitute a major human genomic component. SatDNA sequences can vary on a large number of features, including nucleotide composition, complexity, and abundance. Several satDNA families have been identified and characterized in the human genome through time, albeit at different speeds. Human satDNA families present a high degree of sub-variability, leading to the definition of various subfamilies with different organization and clustered localization. Evolution of satDNA analysis has enabled the progressive characterization of satDNA features. Despite recent advances in the sequencing of centromeric arrays, comprehensive genomic studies to assess their variability are still required to provide accurate and proportional representation of satDNA (peri)centromeric/acrocentric short arm sequences. Approaches combining multiple techniques have been successfully applied and seem to be the path to follow for generating integrated knowledge in the promising field of human satDNA biology.

scholarly journals A lattice-theoretic characterization of pure subgroups of Abelian groups

2021 ◽  
Author(s):  
M. Ferrara ◽  
M. Trombetti
Keyword(s):  
Abelian Group ◽  
Abelian Groups ◽  
Subgroup Lattice ◽  
General Definition ◽  
Short Paper ◽  
Theoretic Characterization ◽  
Definition Of

AbstractLet G be an abelian group. The aim of this short paper is to describe a way to identify pure subgroups H of G by looking only at how the subgroup lattice $$\mathcal {L}(H)$$ L ( H ) embeds in $$\mathcal {L}(G)$$ L ( G ) . It is worth noticing that all results are carried out in a local nilpotent context for a general definition of purity.

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