Threshold silt content dependency on particle morphology (shape and size) of granular materials: review with new evidence

2021 ◽  
Vol 18 (1) ◽  
pp. 28-40
Author(s):  
Abdellah Cherif Taiba ◽  
Youcef Mahmoudi ◽  
Wiebke Baille ◽  
Torsten Wichtmann ◽  
Mostefa Belkhatir
Keyword(s):  
Packing Density ◽  
Mechanical Response ◽  
Particle Morphology ◽  
Silt Content ◽  
Granular Assemblies ◽  
Theoretical Approaches ◽  
Particle Characteristics ◽  
Recorded Data ◽  
New Evidence ◽  
Shape And Size

The threshold silt content is well known as a key parameter affecting the mechanical response of binary granular assemblies considering particle characteristics (size and shape). In this context, the threshold silt content (TSC) is determined from different laboratory tests based on packing density response (emax and emin versus silt content «Sc») and theoretical approaches proposed by several researchers in the specialized published literature using the characteristics of host sand and silt [emax(sand), emin(sand) , emax(silt) , emin(silt) , Gs , Gf and x]. The analysis of the recorded data indicates that the TSC derived from the (emax) curve appears more reliable than that obtained from the (emin) one. Moreover, it is found that the proposed analytical methods are suitable to quantify the threshold silt content (TSC) than that determined experimentally using the packing density (emax and emin). In addition, the test results show that the new introduced ratios [(D50s×As)/(D50f×Af)] and [(Cus×As)/(Cuf×Af)] determined based on particle characteristics (shape and size) appear as appropriate parameters for predicting the threshold silt content (TSC) of sand-silt mixture of the compiled data from the published literature as well as that of the present research related to Chlef sand, Fontainebleau sand and Hostun sand mixed with Chlef silt.

Packing Density and Overconsolidation Ratio Effects on the Mechanical Response of Granular Soils

2019 ◽  
Vol 38 (1) ◽  
pp. 723-742 ◽  
Author(s):  
Youcef Mahmoudi ◽  
Abdellah Cherif Taiba ◽  
Leila Hazout ◽  
Mostefa Belkhatir ◽  
Wiebke Baille
Keyword(s):  
Packing Density ◽  
Mechanical Response ◽  
Granular Soils ◽  
Overconsolidation Ratio

Motivations of manufacturing reshoring: an interpretative framework

2016 ◽  
Vol 46 (2) ◽  
pp. 98-127 ◽  
Author(s):  
Luciano Fratocchi ◽  
Alessandro Ancarani ◽  
Paolo Barbieri ◽  
Carmela Di Mauro ◽  
Guido Nassimbeni ◽  
...  
Keyword(s):  
Secondary Data ◽  
Extensive Discussion ◽  
Content Type ◽  
Extant Literature ◽  
Theoretical Approaches ◽  
Classification Framework ◽  
Manufacturing Location ◽  
Definition Of ◽  
New Evidence ◽  
Interpretative Framework

Purpose – The purpose of this paper is to present a framework for the analysis of reshoring. The framework is then applied to analyze motivations for reshoring, as they emerge from extant literature and from new evidence collected. Design/methodology/approach – The authors start by formulating a literature-grounded definition of reshoring and reviewing some key theoretical approaches for international manufacturing location. In light of these theories, the authors then propose an interpretative framework for the analysis of reshoring motivations. Finally, the authors provide new evidence on this phenomenon, by presenting the findings of an extensive data collection of reshoring cases built on secondary data. Findings – The authors show that a vast array of single drivers of reshoring can be extracted from extant literature; however, the interpretative framework eventually highlights four main typologies of reshoring motivations, thus allowing for a more sound comprehension of why the phenomenon happens. The empirical investigation proves also useful in comparing the relative importance of these motivations, as it reveals that value-driven and country-specific motivations prevail over efficiency-driven and firm-specific ones, respectively. Research limitations/implications – The study is based on the analyses of secondary data extracted from newspapers and magazine sources. Some motivations (and especially those that configure a “correction of a previous erroneous decision”) could have been underestimated. In addition, certain industries (e.g. clothing and footwear), certain countries (USA and China), and certain firms (large companies and MNCs) could have more visibility to the media. Another possible limitation is due to the fact that the classification work inherently implied some discretion and individual judgment. The authors however spent considerable efforts in cross-validating the assessments through extensive discussion within the research team. Originality/value – This is the first paper that summarizes the motivations of the rising reshoring phenomenon and interprets them based on an original theory-derived classification framework.

scholarly journals Width Dependent Elastic Properties of Graphene Nanoribbons

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5042
Author(s):  
George Kalosakas ◽  
Nektarios N. Lathiotakis ◽  
Konstantinos Papagelis
Keyword(s):  
Density Functional ◽  
Mechanical Response ◽  
Fracture Strain ◽  
Graphene Nanoribbons ◽  
Atomistic Simulations ◽  
Elastic Parameters ◽  
Third Order ◽  
Theoretical Approaches ◽  
Functional Methods ◽  
Versus Strain

The mechanical response of graphene nanoribbons under uniaxial tension, as well as its dependence on the nanoribbon width, is presented by means of numerical simulations. Both armchair and zigzag edged graphene nanoribbons are considered. We discuss results obtained through two different theoretical approaches, viz. density functional methods and molecular dynamics atomistic simulations using empirical force fields especially designed to describe interactions within graphene sheets. Apart from the stress-strain curves, we calculate several elastic parameters, such as the Young’s modulus, the third-order elastic modulus, the intrinsic strength, the fracture strain, and the Poisson’s ratio versus strain, presenting their variation with the width of the nanoribbon.

Acquisition of Pragmatics

2017 ◽  
Author(s):  
Myrto Grigoroglou ◽  
Anna Papafragou
Keyword(s):  
Figurative Language ◽  
Intended Meaning ◽  
Pragmatic Development ◽  
Fine Grained ◽  
Theoretical Approaches ◽  
Pragmatic Communication ◽  
Pragmatic Reasoning ◽  
Pragmatic Aspects ◽  
New Evidence ◽  
Considerable Body

To become competent communicators, children need to learn that what a speaker means often goes beyond the literal meaning of what the speaker says. The acquisition of pragmatics as a field is the study of how children learn to bridge the gap between the semantic meaning of words and structures and the intended meaning of an utterance. Of interest is whether young children are capable of reasoning about others’ intentions and how this ability develops over time. For a long period, estimates of children’s pragmatic sophistication were mostly pessimistic: early work on a number of phenomena showed that very young communicators were egocentric, oblivious to other interlocutors’ intentions, and overall insensitive to subtle pragmatic aspects of interpretation. Recent years have seen major shifts in the study of children’s pragmatic development. Novel methods and more fine-grained theoretical approaches have led to a reconsideration of older findings on how children acquire pragmatics across a number of phenomena and have produced a wealth of new evidence and theories. Three areas that have generated a considerable body of developmental work on pragmatics include reference (the relation between words or phrases and entities in the world), implicature (a type of inferred meaning that arises when a speaker violates conversational rules), and metaphor (a case of figurative language). Findings from these three domains suggest that children actively use pragmatic reasoning to delimit potential referents for newly encountered words, can take into account the perspective of a communicative partner, and are sensitive to some aspects of implicated and metaphorical meaning. Nevertheless, children’s success with pragmatic communication is fragile and task-dependent.

scholarly journals Evolving pore orientation, shape and size in sheared granular assemblies

2018 ◽  
Vol 21 (1) ◽  
Author(s):  
Adnan Sufian ◽  
Adrian R. Russell ◽  
Andrew J. Whittle
Keyword(s):  
Granular Assemblies ◽  
Shape And Size

The alkaloids of Senecio jacobaea L: The structures of the Alkaloids and the Necic Acids

1959 ◽  
Vol 12 (2) ◽  
pp. 247 ◽  
Author(s):  
TA Geissman
Keyword(s):  
Degradation Products ◽  
Senecio Jacobaea ◽  
Recorded Data ◽  
New Evidence

Based on a reinterpretation of previously recorded data together with some new evidence, structures VII, IX, XIX, X, and XI have been derived for jacobine, jaconine, jacoline, jaconecic acid, and isojaconecic acid, respectively. The structures of some degradation products of the alkaloids have been clarified.

Synthesis of nanocrystalline manganese oxide powders: Influence of hydrogen peroxide on particle characteristics

1999 ◽  
Vol 14 (12) ◽  
pp. 4594-4601 ◽  
Author(s):  
Jooho Moon ◽  
Masanobu Awano ◽  
Hiroyoshi Takagi ◽  
Yoshinobu Fujishiro
Keyword(s):  
Manganese Oxide ◽  
Manganese Oxides ◽  
Particle Morphology ◽  
Molar Ratio ◽  
Relative Population ◽  
Oxide Powders ◽  
Particle Characteristics ◽  
Size And Morphology ◽  
Oxidation In Air ◽  
Manganese Species

Nanocrystalline manganese oxide powders have been prepared at 25 °C by precipitation from Mn(NO3)2 aqueous solution. The presence and addition sequence of H2O2 significantly influence particle characteristics of the resulting manganese oxides, including crystal structure, particle size and morphology, and surface area, depending upon molar ratio of H2O2 with respect to Mn. The precipitation from preoxidized manganese solution by H2O2 results in flakelike-shaped amorphous hydrous manganese oxide (MnO2xH2O). In the absence of H2O2, on the other hand, amorphous Mn(OH)2 is obtained, and a part of Mn(OH)2 subsequently transforms into crystalline Mn3O4 by oxidation in air. Relative population of amorphous Mn(OH)2 decreases by dissolution when post-treated with H2O2. At Mn:H2O2 = 1:4, the well-defined 16-nm-sized nanocrystalline Mn3O4 with homogenous particle morphology is prepared. The treatment with excess H2O2, however, destroys crystalline Mn3O4 and leads to further oxidation of the aqueous manganese species. Under these conditions, a mixture of needlelike Mn2O3 and cubelike Mn3O4, including amorphous MnO2xH2O, is obtained.

Welfare Policy under New Labour

2007 ◽  
Author(s):  
Hugh Bochel ◽  
Andrew Defty
Keyword(s):  
Welfare State ◽  
Population Health ◽  
Health Research ◽  
Welfare Policy ◽  
New Labour ◽  
Welfare States ◽  
Theoretical Approaches ◽  
New Evidence ◽  
Research And Policy

How welfare states influence population health has long been debated but less well tested by research. This book presents new evidence of the effects of Swedish welfare state on the lives of citizens. The analysis and theoretical approaches developed in the book have wide implications for health research and policy beyond Scandinavia.

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