Influence of Machine Parameters on Ti-6Al-4V Small Sized Specimens Made by Laser Metal Powder Deposition

2021 ◽  
Vol 1161 ◽  
pp. 113-119
Author(s):  
Sarah Milhomme ◽  
Julie Lartigau ◽  
Charles Brugger ◽  
Catherine Froustey ◽  
Ludovic Dufau
Keyword(s):  
State Of The Art ◽  
Raw Materials ◽  
Major Influence ◽  
Powder Metal ◽  
Geometrical Aspect ◽  
Powder Density ◽  
Powder Deposition ◽  
First Results ◽  
Functional Areas ◽  
Part Orientation

The present work is focused on one Additive Manufacturing (AM) process – Laser powder Metal Deposition (LMD-p) – and on one metallic alloy – Ti-6Al-4V. State of the art on LMD-p on Ti-6Al-4V alloy shows that three kinds of process parameters influence mechanical properties of building parts: raw materials (powder and substrate), machine parameters (Laser Power (P), Powder Flow (F) and Building Speed (V)), and building strategies (part orientation, waiting time between layers, etc.). Thus, this paper relates to first manufacturing investigations on small sized specimens (bead, wall and block) with the aim of providing a better knowledge about the first steps of manufacturing. Particularly, this paper is dedicated to the study of machine parameters (P, F and V). First, the influence of each machine parameter on 28 beads is studied separately. The geometrical aspect (high, width, dilution) of each bead is microscopically measured. Similarly, combinations of parameters (P/F, Energy Density and Powder Density) are introduced to increase parameters degree of freedom. First results show that P, V and F have a major influence on the beads’ geometry. In addition, a window process map is plotted and allows determining functional areas of machine parameters. From this map, walls (vertical superposition of one bead) are manufactured and microscopically observed. Functional sets of parameters from walls are selected and blocks can be built.

scholarly journals Transition to Circular Economy in the Fertilizer Sector—Analysis of Recommended Directions and End-Users’ Perception of Waste-Based Products in Poland

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4312
Author(s):  
Marzena Smol
Keyword(s):  
Circular Economy ◽  
Economic Model ◽  
Social Acceptance ◽  
State Of The Art ◽  
Raw Materials ◽  
End Users ◽  
Survey Analysis ◽  
The Social ◽  
Sector Analysis ◽  
Art Analysis

Circular economy (CE) is an economic model, in which raw materials remain in circulation as long as possible and the generation of waste is minimized. In the fertilizer sector, waste rich in nutrients should be directed to agriculture purposes. This paper presents an analysis of recommended directions for the use of nutrient-rich waste in fertilizer sector and an evaluation of possible interest in this kind of fertilizer by a selected group of end-users (nurseries). The scope of research includes the state-of-the-art analysis on circular aspects and recommended directions in the CE implementation in the fertilizer sector (with focus on sewage-based waste), and survey analysis on the potential interest of nurseries in the use of waste-based fertilizers in Poland. There are more and more recommendations for the use of waste for agriculture purposes at European and national levels. The waste-based products have to meet certain requirements in order to put such products on the marker. Nurserymen are interested in contributing to the process of transformation towards the CE model in Poland; however, they are not fully convinced due to a lack of experience in the use of waste-based products and a lack of social acceptance and health risk in this regard. Further actions to build the social acceptance of waste-based fertilizers, and the education of end-users themselves in their application is required.

scholarly journals Technological analysis of Early Bronze ceramics of Shauke 1 settlement

2017 ◽  
Vol 6 (2) ◽  
pp. 104-107
Author(s):  
Saule Zhangeldyevna Rakhimzhanova
Keyword(s):  
Bronze Age ◽  
Raw Materials ◽  
Pottery Production ◽  
Organic Solution ◽  
Cultural Traditions ◽  
North East ◽  
First Results ◽  
East Kazakhstan ◽  
Preparatory Stage ◽  
Technological Analysis

The paper introduces the first results of special technical and technological investigation of ceramic artifacts discovered during the excavations of the Early Bronze Age settlement Shauke 1 located in the Pavlodar Region of North-East Kazakhstan. The research of ceramic objects is conducted within historical and cultural approach following A.A. Bobrinskys technique. 53 samples from different vessels were selected for the technological analysis of ceramic artifacts found at the settlement. The samples were investigated with the use of a binocular microscope MBS-10. The main objective of the research was to identify cultural traditions at a preparatory stage of ceramic vessels production. The author studied initial raw materials selection skills and forming substance preparation. The author recorded the use of several conditional spots as sources of raw materials. Six different recipes of forming substances were identified at the settlement of Shauke 1. The most common amongst them are clay + chamotte + organic solution (60,38%), clay + chamotte + bone + organic solution (28,30%). This indicates the presence of artisans who followed different traditions of pottery production at the site.

Zoogeomorphosite: A concept for, and example of, linking geoheritage and biodiversity heritage

2021 ◽  
Author(s):  
François Bétard
Keyword(s):  
Mixed Forest ◽  
Slope Aspect ◽  
Major Influence ◽  
Termite Mounds ◽  
Morphometric Measurements ◽  
Small Surface ◽  
Formica Rufa ◽  
Wide Range ◽  
First Results ◽  
Ant Mounds

<p>Zoogeomorphosites can be defined as geomorphological sites of special interest for animal biodiversity and conservation. They appear as ideal places for linking geoheritage and biodiversity heritage because of the reciprocal effects and interactions between landforms and animals. On one hand, geomorphodiversity exerts an influence on animal biodiversity at alpha, beta and gamma levels, and many landforms constitute valuable habitats for a wide range of animal species. On the other hand, animals can have direct and indirect geomorphic effects by creating specific landforms (e.g., mounds) and by influencing geomorphic processes (e.g, runoff), respectively.</p><p>The aim of this presentation is (1) to illustrate a worldwide range of sites fitting the conceptual definition of a zoogeomorphosite, with a proposed typology, and (2) to present an example of zoogeomorphological survey conducted on a site in Northwest France (Bois-des-Jarries, Vendée), where geoheritage meets with biodiversity heritage. The selected study site is a granitic geomorphosite composed of two hills with small tors and boulders outcropping at 230-260 m a.s.l., and franging a large fluvial paleo-valley of Ypresian age. The land cover is a mosaic of mixed forests and dry heathlands recognized for their high ecological interest, with many valuable species of vascular plants, birds and invertebrates. A major zoogeomorphic interest of the site is that it hosts an important population of mound-building red wood ants (<em>Formica rufa</em>), a regionally rare and vulnerable species responsible for an impressive collection of biogenic microlandforms (ant mounds) on a small surface (62 ha). A zoogeomorphogical survey carried out in summer 2020 on these ant mounds involved a two-stage methodology: (1) linear surveys along forest paths, in order to calculate mound densities and to proceed with a general inventory of ant mounds; (2) morphometric measurements of mounds using strip transects in 13 representative habitat types, in order to calculate mound volumes and to evaluate their evolution on a 5-years period.</p><p>119 mounds of <em>Formica rufa</em> have been inventoried in summer 2020 along the forest paths, indicating a density of 2-4 mounds ha<sup>–1</sup>. First results of the morphometric measurements indicate that the highest biovolumes are found in pine or mixed forest habitats, and that the geomorphology of the granitic hills (slope, aspect, height above drainage, etc.) is of major influence on their distribution and shape. In turn, ant mounds create environmental heterogeneity, or patch-scale geodiversity, highly favourable to biodiversity, notably because they offer microhabitats for various myrmecophilous insects. Finally, ant mounds can be viewed as a remarkable example of biogeomorphological heritage, hybrid and evolutionary in nature, but highly sensitive to environmental and human-induced changes (e.g., forest clear cuts, tourism pressure). Because ant mounds are an integral component of natural heritage and a key provider of ecosystem services, their inventory and protection as zoogeomorphosites – just like that of termite mounds – are of prime relevance in the wider scope of integrating geodiversity and biodiversity in nature conservation policies and strategies.</p>

A Global Survey of Geospace Electrons with eVlasiator: First Results

2021 ◽  
Author(s):  
Markku Alho ◽  
Markus Battarbee ◽  
Yann Pfau-Kempf ◽  
Urs Ganse ◽  
Lucile Turc ◽  
...  
Keyword(s):  
Solar Wind ◽  
Spatial Resolution ◽  
Kinetic Models ◽  
Electron Distribution ◽  
State Of The Art ◽  
Distribution Functions ◽  
Upper Atmosphere ◽  
Electron Precipitation ◽  
Gas Dynamic ◽  
First Results

<div> <p>Models of the geospace plasma environment have been proceeding towards more realistic descriptions of the solar wind—magnetosphere interaction, from gas-dynamic to MHD and hybrid ion-kinetic models such as the state-of-the-art Vlasiator model. Advances in computational capabilities have enabled global simulations of detailed physics, but the electron scale has so far been out of reach in a truly global setting. </p> </div><div> <p>In this work we present results from eVlasiator, an offshoot of the Vlasiator model, showing first results from a global 2D+3V kinetic electron geospace simulation. Despite truncation of some electron physics and use of ion-scale spatial resolution, we show that realistic electron distribution functions are obtainable within the magnetosphere and describe these in relation to MMS observations. Electron precipitation to the upper atmosphere from these velocity distributions is estimated.</p> </div>

Leveraging Supply Chain Management in the Digital Economy

2009 ◽  
pp. 526-531
Author(s):  
Mahesh S. Raisinghani
Keyword(s):  
Supply Chain ◽  
Information Systems ◽  
Supply Chain Management ◽  
Raw Materials ◽  
Third Party ◽  
Third Party Logistics ◽  
End User ◽  
Chain Management ◽  
Critical Part ◽  
Functional Areas

A supply chain is a network of facilities and distribution options that performs the functions of procurement of materials, transformation of these materials into intermediate and finished products, and the distribution of these finished products to customers. In other words, supply chain encompasses all of the activities associated with moving goods from raw-materials stage through to the end user. The information systems needed to monitor all of these activities are a critical part of the mix. Successful supply chain management (SCM), then, coordinates and integrates all of these activities into a seamless process. It embraces and links all of the partners in the chain. In addition to the key functional areas within the organization, these partners include vendors, carriers, third-party logistics companies, and information systems providers.

Supply Chain Information Systems and Decision Support

2010 ◽  
pp. 814-821 ◽  
Author(s):  
Liam Doyle
Keyword(s):  
Supply Chain ◽  
Decision Support ◽  
Raw Materials ◽  
Computerized Decision Support ◽  
Chain Management ◽  
Trading Partners ◽  
Initial Source ◽  
Functional Areas ◽  
Computerized Decision Support Systems ◽  
Final Consumer

Supply chains have become have become increasingly important as organisations have moved from competing on a stand-alone basis to recognizing that their success depends upon their trading partners. This includes their upstream suppliers and downstream customers. A supply chain involves a number of tiers of suppliers and customers that extends from the initial source of raw materials through to the final consumer of the finished product. Supply chain management involves the coordination of a number of functional areas in multiple organisations. Large amounts of information can be captured describing the activities in these organisations. It is possible to use this information in order to assist in decision making at strategic, tactical, and operational levels of the supply chain. The large volume of information available and the interdependencies between the activities within these multiple organisations means that it is necessary to employ computerized decision support systems to optimize supply chain activities.

scholarly journals Sensor‐Based Ore Sorting Technology in Mining—Past, Present and Future

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 523 ◽  
Author(s):  
Robben ◽  
Wotruba
Keyword(s):  
State Of The Art ◽  
Raw Materials ◽  
Separation Process ◽  
Raw Material ◽  
Coarse Grained ◽  
Flow Diagram ◽  
Process Flow Diagram ◽  
Mineral Raw Materials ◽  
Grain Sizes ◽  
Waste Dumps

While the deposit qualities for mineral raw materials are constantly decreasing, the challenges for sustainable raw material processing are increasing. This applies not only to the demand for minimizing the consumption of energy, water, and reagents, but also to the reduction of residual materials, especially fine and difficult-to-landfill materials. Sensor‐based ore sorting can be used as a separation process for coarser grain sizes before the application of fine comminution and separation technologies and is applicable for a large variety of mineral raw materials. Sensor‐based ore sorting applies at various points in the process flow diagram and is suitable for waste elimination, for material diversion into different process lines, for the production of pre‐ and final concentrates, as well as for the reprocessing of coarse‐grained waste dumps and other applications. The article gives an overview of the development and state of the art of sensor‐based ore sorting for mineral raw materials and introduces various applications.

ACTRIS efforts for Sentinel 5 Precursor validation

2020 ◽  
Author(s):  
Lucia Mona ◽  
Nikolaos Papagiannopoulus ◽  
Gelsomina Pappalardo ◽  
Ulla Wandinger ◽  
Giuseppe D'Amico ◽  
...  
Keyword(s):  
State Of The Art ◽  
Aerosol Layer ◽  
Additional Information ◽  
Cloud Radar ◽  
Vertical Profiling ◽  
First Results ◽  
Multi Wavelength ◽  
Spatio Temporal ◽  
Aerosol Type

<p>The Sentinel 5 Precursor products, call for an accurate validation. Europe can be nowadays regarded as a leader in ground-based vertical profiling observations. ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure Network) is an EC funded infrastructure integrating European ground-based stations equipped with advanced atmospheric equipment. Among these, EARLINET (European Aerosol Research Lidar NETwork) and Cloudnet are well-established networks providing vertical profiles of aerosol and clouds with high vertical and temporal resolution. A network of ground-based stations has the ability to provide the spatio-temporal development of aerosol and cloud fields and offers a unique opportunity for the validation of observations from space. In this project, state-of-the-art instrumentations for observing aerosol and clouds will be used for validation purposes: multi-wavelength lidar (EARLINET) and Doppler cloud radar (Cloudnet).</p><p>Characterization of aerosol and cloud fields over the stations is provided by the use of EARLINET and Cloudnet data. Additional information is provided by AERONET data where available. Differences will be reported as a function of aerosol load, aerosol and cloud height, aerosol type, cloud type and underneath surface.</p><p>First results of validation efforts performed within ACTRIS in terms of a quantitative evaluation of the accuracy of S5P aerosol and cloud products will be reported. This activity is done under the EC-ACTS: Earlinet and Cloudnet - Aerosol and Clouds Teams for Sentinel-5P Validation unfunded project, which comprises 3 EARLINET/Cloudnet stations [Potenza (IT), Leipzig (DE) and Cabauw (NL)]; 3 EARLINET stations [Granada (ES), Athens (GR) and Bucharest (RO)] and 2 Cloudnet sites [Mace Head (IE) and Sodankylä (FI)].</p><p>In particular, the first results will be about the S5P Aerosol Layer Height (mandatory product) and Aerosol Optical Depth (optional product) and whenever available the AAI-based columnar Aerosol Type product.</p>

scholarly journals The Use of SEM and Other Complimentary Techniques for the Determination of Properties of Cementitious Materials

1992 ◽  
Vol 00 (8) ◽  
pp. 4-4 ◽  
Author(s):  
Eric A. Draper ◽  
Jan Skalny
Keyword(s):  
Building Materials ◽  
State Of The Art ◽  
Raw Materials ◽  
Cementitious Materials ◽  
Modern State ◽  
Microscopic Evaluation ◽  
The World ◽  
Cost Effect

The need for continued rehabilitation of our concrete infrastructure has lead to the adaptation of modern “state-of-the-art” analytical methods for the characterization of concrete and other cementitious materials. Some of these techniques have not, until relatively recently, been commonly associated with the evaluation of concrete but are very useful both as tools for quality assurance and in the determination of the extent of existing damage. The technique of interest here is the coordinated electron-optical microscopic evaluation of concrete.Concrete is the most widely used building material in the world. Contrary to popular belief, concrete is not inert but chemically very complex and dynamic. While it is true that, pound for pound, concrete and its raw materials (cement, aggregate and water} are the most inexpensive building materials available for construction, it is also true that it responds to its environment in numerous and sometimes very subtle ways. These responses may sometimes result in a loss of durability and tremendous amounts of time and money being expended while searching for the cause(s) of the problem and providing a cost-effect solution A quick survey of any large metropolitan area and the on-going construction repairs to highways and bridge decks there will quickly confirm this.

Sign in / Sign up

Export Citation Format

Share Document