scholarly journals ASSESSING THE EFFECT OF ARMOURSTONE SHAPE AND WEAR

1988 ◽  
Vol 1 (21) ◽  
pp. 170 ◽  
Author(s):  
John-Paul Latham ◽  
Alan B. Poole
Keyword(s):  
Chemical Weathering ◽  
Shape Change ◽  
Block Size ◽  
New Techniques ◽  
Wear Factor ◽  
Mill Time ◽  
Design Concepts ◽  
Initial Block ◽  
Physico Chemical ◽  
Rapid Changes

Impacts, abrasion and physico-chemical weathering which sometimes result in rapid changes of armour shape and size can have disastrous consequences for armour stability. This paper draws together the background ideas and some new techniques which have been developed to tackle the prediction of weight loss and shape change of rock armourstone during the life of a coastal structure. The framework proposed is to measure separately the wear resisting material properties of a rock type using a tumbling mill simulation of prototype block degradation. Time on the structure is then related to mill time by a factor which accounts for initial block size and the site specific environmental conditions. A field site in Scotland is used to demonstrate the new image analysis methods for measuring rounding of prototype blocks. The shape analysis results can also be used to calibrate the equivalent wear factor for conditions at that site. Discussion of this framework is extended to dynamically stable design concepts where abrasion losses are faster. Preliminary flume testing in collaboration with H. R. Wallingford indicates that losses in stability due to rounding could be considerable.

scholarly journals New Methods for Assessing Rapid Changes in Suicide Risk

2021 ◽  
Vol 12 ◽  
Author(s):  
Elizabeth D. Ballard ◽  
Jessica R. Gilbert ◽  
Christina Wusinich ◽  
Carlos A. Zarate
Keyword(s):  
Suicide Risk ◽  
Suicidal Thoughts ◽  
New Techniques ◽  
Current State ◽  
Digital Phenotyping ◽  
Rapid Changes ◽  
And Behavior ◽  
Ecological Momentary ◽  
Assessment Strategies ◽  
Suicidal Thoughts And Behaviors

Rapid-acting interventions for the suicide crisis have the potential to transform treatment. In addition, recent innovations in suicide research methods may similarly expand our understanding of the psychological and neurobiological correlates of suicidal thoughts and behaviors. This review discusses the limitations and challenges associated with current methods of suicide risk assessment and presents new techniques currently being developed to measure rapid changes in suicidal thoughts and behavior. These novel assessment strategies include ecological momentary assessment, digital phenotyping, cognitive and implicit bias metrics, and neuroimaging paradigms and analysis methodologies to identify neural circuits associated with suicide risk. This review is intended to both describe the current state of our ability to assess rapid changes in suicide risk as well as to explore future directions for clinical, neurobiological, and computational markers research in suicide-focused clinical trials.

Physico-chemical weathering reactions as a formulary for time-lapsing ageing tests

1987 ◽  
Vol 20 (2) ◽  
pp. 127-145 ◽  
Author(s):  
D. K. Knöfel ◽  
D. Hoffmann ◽  
R. Snethlage
Keyword(s):  
Chemical Weathering ◽  
Physico Chemical

scholarly journals Synthetic Turing protocells: vesicle self-reproduction through symmetry-breaking instabilities

2007 ◽  
Vol 362 (1486) ◽  
pp. 1821-1829 ◽  
Author(s):  
Javier Macía ◽  
Ricard V Solé
Keyword(s):  
Cell Cycle ◽  
Symmetry Breaking ◽  
Shape Change ◽  
Simple Set ◽  
Novel Approach ◽  
Physico Chemical ◽  
Metabolic Reactions ◽  
Reliable Mechanism ◽  
Chemical Events ◽  
Growth And Reproduction

The reproduction of a living cell requires a repeatable set of chemical events to be properly coordinated. Such events define a replication cycle, coupling the growth and shape change of the cell membrane with internal metabolic reactions. Although the logic of such process is determined by potentially simple physico-chemical laws, modelling of a full, self-maintained cell cycle is not trivial. Here we present a novel approach to the problem that makes use of so-called symmetry breaking instabilities as the engine of cell growth and division. It is shown that the process occurs as a consequence of the breaking of spatial symmetry and provides a reliable mechanism of vesicle growth and reproduction. Our model opens the possibility of a synthetic protocell lacking information but displaying self-reproduction under a very simple set of chemical reactions.

Learning Organisation

2021 ◽  
pp. 2570-2591
Author(s):  
Chandra Sekhar Patro
Keyword(s):  
Business Environment ◽  
Organisational Performance ◽  
Learning Organisation ◽  
New Techniques ◽  
Business World ◽  
Rapid Changes ◽  
New Ideas ◽  
To Come ◽  
Changing Demographics ◽  
Market Learning

In an ever-changing business world, the need to gain a competitive advantage has become extremely imperative for enterprises to survive in the age of globalisation. Much emphasis on learning has arisen due to rapid changes in the business environment, including uncertain market conditions, increasing complexity, changing demographics, and global competition. The companies are forced to innovate and develop new techniques for improving the quality and functionality of products, reduce costs, and respond to the highly elegant customers' demands in order to survive in the market. Learning organisations encourage the groups to come together and explore new ideas without being directed by a manager. The main objective of the chapter is to measure the effect of the dimensions of the learning organisation on organisational performance. A positive statistical relationship exists among the learning organisation dimensions and with organisational performance. Organisations must consider the learning organisation dimensions to enhance employees efficiency and organisational performance.

The Rock Art of Sub-Saharan Africa

2018 ◽  
Author(s):  
Jean-Loïc Le Quellec
Keyword(s):  
Rock Art ◽  
Sub Saharan Africa ◽  
Chemical Analyses ◽  
New Techniques ◽  
History Of Research ◽  
Physico Chemical ◽  
History Of ◽  
Sub Saharan ◽  
Key Dimensions ◽  
Art Research

This chapter presents key dimensions of sub-Saharan African rock art (pictograms and petroglyphs). Particular attention is paid to recent approaches, the application of physico-chemical analyses, and stylistic determinations used to establish reliable chronologies. Stylistic approaches have been particularly influential in the interpretation of rock imagery, as has the identification of specific motifs (such as loincloths and aprons) that serve to indicate ritual and initiatory roles, particularly for women. The preservation of rock art and access to sites are topics of renewed concern that tend to increasingly involve local communities. In sub-Saharan Africa as in other parts of the world, rock art research is well poised to build on a long history of research, and to benefit from new techniques such as digital enhancement that are likely to considerably improve knowledge and increase the known corpus of art.

scholarly journals Effect of biodegradable coatings on the shelf life of Hancornia speciosa

2021 ◽  
Vol 51 ◽  
Author(s):  
Naiara Tays Francisco Felicio ◽  
Suzane Martins Ferreira ◽  
Taysa Martins de Oliveira ◽  
Emmerson Rodrigues de Moraes ◽  
Dayana Silva Batista Soares
Keyword(s):  
Lactic Acid ◽  
Shelf Life ◽  
Whey Protein ◽  
Cassava Starch ◽  
Concomitant Increase ◽  
New Techniques ◽  
Physico Chemical ◽  
Nutritional Characteristics ◽  
Biodegradable Coatings ◽  
Hancornia Speciosa

ABSTRACT The production of Hancornia speciosa Gomes, in Brazil, has increased significantly in recent years, with a concomitant increase in post-harvest losses, making it important to find out new techniques that contribute to extend the shelf life of this fruit without altering its physical, sensory and nutritional characteristics. The present study aimed to apply biodegradable coatings made from chitosan, whey protein, lactic acid and cassava starch to H. speciosa, as well as to assess their efficiency on the shelf life of the fruits. For that, physico-chemical analyses were performed to determine the pH, acidity, ºBrix, phenolic compounds, vitamin C and moisture content. The coatings with 1 % of chitosan, 4 % of whey protein, 3 % of cassava starch and 1.5 % of lactic acid presented satisfactory results at ambient temperature (25 ºC), delaying the ripening process, when compared to the controls.

scholarly journals Characterization of weathering profiles of the crystal rocks of eastern Bucaramanga and definition of hydrogeological properties

2017 ◽  
pp. 16-30
Author(s):  
Juan Diego Colegial-Gutiérrez ◽  
María Camila Forero-Quintero ◽  
María Alejandra Fuentes-Rueda ◽  
Sully Gomez Isidro
Keyword(s):  
Chemical Weathering ◽  
Unit Weight ◽  
X Ray ◽  
Weathered Rock ◽  
Weathering Processes ◽  
Dry Unit Weight ◽  
Physico Chemical ◽  
Hydrogeological Properties ◽  
Definition Of

In the process of improving the knowledge of the hydrogeological potential of weathered zones in crystalline rocks and compounds that can behave as aquifers, this article is performed whose area of study is located east of the metropolitan area of Bucaramanga, Santander Massif consists of two main lithological units; the Neis of Bucaramanga and Santander Group plutonic (diorite, granodiorite-tonalite gray quartz monzonite and monzogranite). These rocks have undergone brittle deformation, physico-chemical weathering mainly influenced by the tropical atmosphere of the area also are jointed and fractured creating conditions that facilitate the flow of water and in turn be optimized weathering processes in the region. He appealed to the identification and location of field weathering profiles made a detailed study of outcrops, presenting a thickness of 90.4 m for the profile of the Gneisic rock weathering and 68.5 m for the profile of granodiorite rock, made up 6 steps weathering of which samples each were taken and carry out macroscopic analysis, petrographic and geochemical using thin films, determining the percentage of porosity, humidity, dry unit weight, X-ray fluorescence, electron microscopy Sweeping and Grading; base characterizing weathering profiles and properties, highlighting the potential hydrogeological found in the Range II: Slightly weathered rock and interval V: Completely weathered rock profile of granodiorite rock and Rock Gneisic profile, the interval III : Moderately weathered rock and the range V: Completely weathered rock, since these stages of weathering, moisture peaks present, regular micro fractures and high porosities.

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