Atmospheric Characterization of Antarctic Polar Regions and Validation of Tropospheric and Ionospheric Models based on GNSS Experimental Campaign Data

2020 ◽  
Author(s):  
C. Moriana-Varo ◽  
C. Sanz-Garzón ◽  
F. Martín-Porqueras ◽  
M. Castillo-Fraile ◽  
J. Ventura-Traveset
Keyword(s):  
Polar Regions ◽  
Experimental Campaign ◽  
Ionospheric Models

A mineralogical characterization of biogenic calcium carbonates precipitated by heterotrophic bacteria isolated from cryophilic polar regions

Geobiology ◽  
2014 ◽  
Vol 12 (6) ◽  
pp. 542-556 ◽  
Author(s):  
J. Ronholm ◽  
D. Schumann ◽  
H. M. Sapers ◽  
M. Izawa ◽  
D. Applin ◽  
...  
Keyword(s):  
Heterotrophic Bacteria ◽  
Polar Regions ◽  
Mineralogical Characterization ◽  
Calcium Carbonates

Complementary Use of Inductive Test and Bending Test for the Characterization of SFRC

2014 ◽  
Vol 580-583 ◽  
pp. 2213-2219 ◽  
Author(s):  
Lin Liao ◽  
Sergio Cavalaro ◽  
Albert de la Fuente ◽  
Antonio Aguado
Keyword(s):  
Steel Fibre ◽  
Fibre Orientation ◽  
Bending Test ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Flexural Behaviour ◽  
Steel Fibre Reinforced Concrete ◽  
Three Point Bending ◽  
Experimental Campaign

Many researches have been conducted in past decades for promoting the application of steel fibre reinforced concrete (SFRC), either conventional or self-compacting. However, the differences of post-crack behaviour and the properties of these two types of concrete remains unclear. The objective of this paper is to analyse such differences in terms of flexural behaviour, fibre orientation and contribution as well as the fibre content. For that, an extensive experimental campaign was carried out. In total 3 mixes of self-compacting and 3 mixes with traditional concrete were produced with the nominal fibre contents of 30kg/m3, 45kg/m3 and 60kg/m3. In each series, specimens were produces and characterized by three point bending test (code EN 14651) and inductive test. The results illustrate how fibre orientation and distribution justify the differences in the mechanical behaviour of the materials and the scatter of the bending test results.

scholarly journals Geometrical and thermal influences on a bacterial cellulose based sensing element for acceleration measurements

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 151
Author(s):  
Carlo Trigona ◽  
Giovanna Di Pasquale ◽  
Salvatore Graziani ◽  
Antonino Licciulli ◽  
Rossella Nisi ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Environmental Temperature ◽  
Motion Sensors ◽  
Sensing Element ◽  
Experimental Campaign ◽  
Sustainable Economy ◽  
Production Technologies ◽  
Common Plant ◽  
Environmentally Friendly Production

The need for a sustainable economy necessitates new environmentally friendly production technologies as well as devices that can be easily recycled, disposed of, and, finally, degraded, without any release of pollutants to the environment. In this context, bacterial cellulose (BC) has recently been investigated as an intriguing solution for the creation of green motion sensors. BC has excellent mechanical properties, and it is fully biodegradable and greener than the more common plant-derived cellulose. In this paper, we investigate the influence of geometry and environmental temperature on BC based sensing elements. More specifically, the influence of these quantities on a previously investigated BC-based accelerometer are reported. An experimental campaign and the characterization of the proposed green device for several geometries (from 7 to 22 mm of length) and various temperatures (from 5 °C to 55 °C) is addressed, obtaining very intriguing results.

scholarly journals Agrigento Cathedral

2016 ◽  
pp. 975-1001
Author(s):  
Liborio Cavaleri ◽  
Maria Giovanna Saccone ◽  
Maurizio Costa ◽  
Calogero Foti ◽  
Giuseppe Basile
Keyword(s):  
Mechanical Characterization ◽  
The State ◽  
Fe Model ◽  
Structural Members ◽  
Safety Level ◽  
Foundation Soil ◽  
Experimental Campaign ◽  
Extensive Damage

At present Agrigento Cathedral is affected by extensive damage that seems to be mainly due to partial slumping of the foundation soil. The chapter deals with the state of damage that affects the cathedral and the investigation carried out for the mechanical characterization of the construction, the formulation of an FE model and the assessment of the safety level with respect to the service loads and with respect to exceptional loads like seismic ones. In the chapter the details of the above investigation are discussed, consideration also being given to the monitoring carried out in order to understand whether the phenomenon affecting the cathedral is ongoing. The results of the monitoring and the experimental campaign on the structural members are described, revealing an unexpectedly low capacity with respect to service loads. Then a comparison is carried out between the response of the FE model and the experimental observations for the identification of the causes of distress. Finally possible action is discussed.

scholarly journals Bioinformatic Analysis of 1000 Amphibian Antimicrobial Peptides Uncovers Multiple Length-Dependent Correlations for Peptide Design and Prediction

Antibiotics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 491 ◽  
Author(s):  
Guangshun Wang
Keyword(s):  
Antimicrobial Peptides ◽  
Average Length ◽  
Critical Role ◽  
Bioinformatic Analysis ◽  
Polar Regions ◽  
Net Charge ◽  
Peptide Database ◽  
Peptide Length ◽  
Potential Applications

Amphibians are widely distributed on different continents, except for the polar regions. They are important sources for the isolation, purification and characterization of natural compounds, including peptides with various functions. Innate immune antimicrobial peptides (AMPs) play a critical role in warding off invading pathogens, such as bacteria, fungi, parasites, and viruses. They may also have other biological functions such as endotoxin neutralization, chemotaxis, anti-inflammation, and wound healing. This article documents a bioinformatic analysis of over 1000 amphibian antimicrobial peptides registered in the Antimicrobial Peptide Database (APD) in the past 18 years. These anuran peptides were discovered in Africa, Asia, Australia, Europe, and America from 1985 to 2019. Genomic and peptidomic studies accelerated the discovery pace and underscored the necessity in establishing criteria for peptide entry into the APD. A total of 99.9% of the anuran antimicrobial peptides are less than 50 amino acids with an average length of 24 and a net charge of +2.5. Interestingly, the various amphibian peptide families (e.g., temporins, brevinins, esculentins) can be connected through multiple length-dependent relationships. With an increase in length, peptide net charge increases, while the hydrophobic content decreases. In addition, glycine, leucine, lysine, and proline all show linear correlations with peptide length. These correlations improve our understanding of amphibian peptides and may be useful for prediction and design of new linear peptides with potential applications in treating infectious diseases, cancer and diabetes.

Mechanical characterization of tetraxial textiles

2017 ◽  
Vol 48 (1) ◽  
pp. 3-24 ◽  
Author(s):  
Mehdi Ghazimoradi ◽  
Valter Carvelli ◽  
Maria Chiara Marchesi ◽  
Roberto Frassine
Keyword(s):  
Mechanical Properties ◽  
Strain Field ◽  
Mechanical Characterization ◽  
Tensile Tests ◽  
Image Correlation ◽  
Correlation Technique ◽  
Digital Image Correlation Technique ◽  
Experimental Campaign ◽  
Out Of Plane

In this paper, the mechanical properties of different tetraxial fabrics are investigated. Fabrics were produced using an innovative loom capable of weaving four threads at the same time with complete discretion of yarn type and count. The experimental investigation deals with in-plane and out-of-plane mechanical testing of tetraxial fabrics, as well as yarns made of four different materials (polyethylene terephthalate, glass, aramid, and basalt). The digital image correlation technique was used to measure the in-plane strain field for both uniaxial and biaxial tensile tests. The extensive experimental campaign allowed for a complete mechanical characterization of this novel fabric architecture including interlacement of different yarns.

Experimental Characterization of Masonry Panels Strengthened with NFRCM

2021 ◽  
Vol 898 ◽  
pp. 43-48
Author(s):  
Claudia Brito de Carvalho Bello ◽  
Daniele Baraldi ◽  
Antonella Cecchi ◽  
Daniel V. Oliveira
Keyword(s):  
Mechanical Behavior ◽  
Natural Fibers ◽  
Experimental Tests ◽  
Experimental Characterization ◽  
Cementitious Matrix ◽  
Experimental Campaign ◽  
Innovative Materials ◽  
Sustainable Materials ◽  
Fabric Reinforced Cementitious Matrix

In the last years, the interest in eco-sustainable composites has consistently increased. Such innovative materials are actually a promising sustainable solution for structural strengthening since they can be an alternative to petroleum‐based materials, which are frequently used for masonry retrofitting. This work describes an experimental campaign dedicated to investigating the behavior of Fabric-Reinforced Cementitious Matrix (FRCM) with natural fibers (NFRCM) made with eco-sustainable materials. Experimental tests are performed on unreinforced masonry panels (URM) and reinforced ones (RM), for characterizing their mechanical behavior. URM samples are compared with RM ones accounting for their response under shear actions.

Assessment of spatial and temporal TEC variations derived from ionospheric models over the polar regions

2018 ◽  
Vol 93 (4) ◽  
pp. 455-471 ◽  
Author(s):  
Hu Jiang ◽  
Jingbin Liu ◽  
Zemin Wang ◽  
Jiachun An ◽  
Jikun Ou ◽  
...  
Keyword(s):  
Polar Regions ◽  
Ionospheric Models
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