Exploring geophysical properties of Sn-Cu-Pb-Zn deposits at depth using ROBOMINERS’ mid-perception capability.

2020 ◽  
Author(s):  
Giorgia Stasi ◽  
Christian Burlet ◽  
Frederic Nguyen ◽  
Yves Vanbrabant
Keyword(s):  
Terahertz Spectroscopy ◽  
Resistivity Measurement ◽  
Energy Transition ◽  
The Body ◽  
Thz Spectroscopy ◽  
Dc Resistivity ◽  
Drilling Mud ◽  
Horizon 2020 ◽  
Vein Type ◽  
Set Up

<p>The Horizon 2020 ROBOMINERS project (Grant No. 820971) is developing a modular robot miner prototype following a bio-inspired design, capable of operating, navigating and performing selective mining in a flooded underground environment.</p><p>The project has been set up with the long-term strategic objective to facilitate EU access to mineral raw materials – including those that are considered as strategic or critical for the energy transition - from domestic resources and decreasing thus the European import dependency. The use of the robot miner will especially be relevant for mineral deposits that are small or difficult to access.</p><p>Conventional DC resistivity and IP methods for geophysical exploration are well reported in the literature, however, in the framework of ROBOMINERS we wants to develop a new approach for DC resistivity and IP that use the deposit itself as a probe for the diffusion of the signal.</p><p>Ideally the electrode will be positioned at the end of the robot legs (in contact with the terrain) and the source on the drilling head. This set up will allow to move the source and electrode in preferential position in order to cover the biggest surface possible, and to maximize resistivity measurements avoiding the lack of resolution due to the positioning of electrodes on grounds surface or distant borehole.</p><p>In addition to resistivity measurement we are considering an additional technique, namely the Terahertz spectroscopy. The concept for the THz scanning spectroscopy is to use the body of the robot to arrange at 360° the THz detectors and install on the robot’s front the THz source (positioned on a mobile arm or on the drilling head). This technique will allow to scan the mine’s wall and produce a first model of the deposit section. This model will then help for the positioning of the DC/IP source. THz spectroscopy can be applied for the screening of the wall in case it is covered in drilling mud, where regular multispectral camera might not work. As this technique is highly affected by the presence of water is not yet defined its precise field of applicability that will need to be outlined within the project framework.</p><p>For our scope we are going to consider (narrow-) vein type and stratiform deposits; those kinds of deposits that could have formerly been explored but their exploitation was considered as uneconomic due to the small size of the deposits or their difficulty of access. More specifically we are going to investigate and review the geophysical properties of tin-lead-zinc wolframite vein type deposit for DC resistivity and IP technique and Terahertz spectroscopy.</p><div>2.11.0.0</div>

scholarly journals Temperature dependent poly(L-lactide) crystallization investigated by Fourier transform terahertz spectroscopy

2021 ◽  
Author(s):  
Seiichiro Ariyoshi ◽  
Satoshi Ohnishi ◽  
Hikaru Mikami ◽  
Hideto Tsuji ◽  
Yuki Arakawa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Absorption Spectra ◽  
Terahertz Spectroscopy ◽  
Thz Spectroscopy ◽  
Frequency Range ◽  
Temperature Dependent ◽  
Thz Absorption

Poly(L-lactide) (PLLA) was investigated by Fourier transform terahertz (THz) spectroscopy over the frequency range of 1.0 – 8.5 THz. THz absorption spectra were acquired for PLLA samples isothermally crystallized at...

scholarly journals A Selective Solar Absorber for Unconcentrated Solar Thermal Panels

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 900
Author(s):  
Davide De Maio ◽  
Carmine D’Alessandro ◽  
Antonio Caldarelli ◽  
Daniela De Luca ◽  
Emiliano Di Gennaro ◽  
...  
Keyword(s):  
Fossil Fuels ◽  
High Vacuum ◽  
Optimization Procedure ◽  
Energy Transition ◽  
Spectral Emissivity ◽  
Thermal Conversion ◽  
Stagnation Temperature ◽  
Solar Absorber ◽  
Analytical Formulas ◽  
Set Up

A new Selective Solar Absorber, designed to improve the Sun-to-thermal conversion efficiency at mid temperatures in high vacuum flat thermal collectors, is presented. Efficiency has been evaluated by using analytical formulas and a numerical thermal model. Both results have been experimentally validated using a commercial absorber in a custom experimental set-up. The optimization procedure aimed at obtaining Selective Solar Absorber is presented and discussed in the case of a metal dielectric multilayer based on Cr2O3 and Ti. The importance of adopting a real spectral emissivity curve to estimate high thermal efficiency at high temperatures in a selective solar absorber is outlined. Optimized absorber multilayers can be 10% more efficient than the commercial alternative at 250 °C operating temperatures, reaching 400 °C stagnation temperature without Sun concentration confirming that high vacuum flat thermal collectors can give important contribution to the energy transition from fossil fuels to renewable energy for efficient heat production.

External work in level and grade walking on a motor-driven treadmill

1960 ◽  
Vol 15 (5) ◽  
pp. 759-763 ◽  
Author(s):  
J. W. Snellen
Keyword(s):  
Heat Loss ◽  
Heat Production ◽  
Total Energy Expenditure ◽  
The Body ◽  
External Work ◽  
Thermal Exchange ◽  
Level Walking ◽  
The Subject ◽  
Set Up ◽  
Physical Laws

When studying a walking subject's thermal exchange with the environment, it is essential to know whether in level walking any part of the total energy expenditure is converted into external mechanical work and whether in grade walking the amount of the external work is predictable from physical laws. For this purpose an experiment was set up in which a subject walked on a motor-driven treadmill in a climatic room. In each series of measurements a subject walked uphill for 3 hours and on the level for another hour. Metabolism was kept equal in both situations. Air and wall temperatures were adjusted to the observed weighted skin temperature in order to avoid any heat exchange by radiation and convection. Heat loss by evaporation was derived from the weight loss of the subject. All measurements were carried out in a state of thermal equilibrium. In grade walking there was a difference between heat production and heat loss by evaporation. This difference equaled the caloric equivalent of the product of body weight and gained height. In level walking the heat production equaled heat loss. Hence it was concluded that in level walking all the energy is converted into heat inside the body. Submitted on April 26, 1960

On one-dimensional unsteady flow at infinite Mach number

1968 ◽  
Vol 304 (1478) ◽  
pp. 255-273 ◽  
Keyword(s):  
Asymptotic Expansion ◽  
Blast Wave ◽  
Outer Part ◽  
The Body ◽  
Viscous Boundary Layer ◽  
Outer Flow ◽  
Hypersonic Speeds ◽  
Set Up ◽  
Viscous Boundary ◽  
Infinite Set

The use of the blast-wave analogy, as an aid to the interpretation of experimental data on the motion of a fluid past an obstacle at hypersonic speeds, has led to the theoretical study of its role in an asymptotic expansion of the solution to the governing equations at large distances downstream of the body. In all attempts to set up such an expansion it has proved necessary to divide the flow régime into two parts, an outer part dominated by the blast wave and an inner part consisting of streamlines which, originally, pass close by the body. The matching of these two regions is apparently only possible if a certain integral vanishes. In the present paper a numerical integration, in one particular set of circumstances, is carried out to test the validity of the asymptotic expansion proposed. Formally, an unsteady problem is tackled, for ease of computation, but the steady analogue follows immediately and is of exactly the form discussed in the earlier investigations. It is found that the main results are in line with the theory and that the integral in question is indistinguishable from zero. However, a deeper investigation of the asymptotic expansion shows that, for an expansion of the type envisaged, an infinite set of integrals must each vanish. The next integral does not appear to be zero according to our computations but this result is not believed to be conclusive. Assuming that all the integrals do vanish, then it appears that the inner layer, which although inviscid, has many of the characteristics of a viscous boundary layer, has the addi­tional, surprising property that it can exert no direct influence on the outer flow at large distances downstream of the body.

scholarly journals Weavers & Warriors? Gender and Online Identity in 1997 and 2007 V1.0

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
Deirdre Ruane
Keyword(s):  
Preliminary Investigation ◽  
The Body ◽  
Internet Technology ◽  
Online Identity ◽  
Men And Women ◽  
Online Interactions ◽  
And Performance ◽  
And Gender ◽  
Set Up ◽  
Active Exploration

In 1997 the Internet was seen by many as a tool for radical reinterpretation of physicality and gender. Cybertheorists predicted we would leave our bodies behind and interact online as disembodied minds, and that the technology would reshape the way we saw ourselves. However, physicality has proved to be an inextricable part of all our interactions. Changing Internet technology has allowed Net users to find a myriad ways to perform and express their gender online. In this paper I consider attitudes to gender on the Net in 1997, when the main concerns were the imbalance between men and women online and whether it was possible or desirable to bring the body into online interactions. In much of the discourse surrounding gender online, a simple binary was assumed to exist. I go on to consider the extent to which those attitudes have changed today. Through my own experience of setting up a women’s community on Livejournal, and my observations of a men’s community set up in response, I conclude that though traditional attitudes to gender have largely translated to the Net and the binary is still the default view, some shifts have occurred. For example, between 1997 and today there seems to have been a fundamental change in perceptions of women’s attitudes to adversarial debate, and an increase in awareness of genders beyond the binary. In addition, experience and preliminary investigation lead me toward a hypothesis that today’s female-identified Net users are engaged in more conscious and active exploration and performance of their gender online than male-identified users are.

Theorising love in sociological thought: Classical contributions to a sociology of love

2017 ◽  
Vol 18 (1) ◽  
pp. 3-20 ◽  
Author(s):  
Mihai Stelian Rusu
Keyword(s):  
Nuclear Family ◽  
Social World ◽  
The Body ◽  
Talcott Parsons ◽  
Sociological Tradition ◽  
Binding Force ◽  
Social Nature ◽  
External Pressures ◽  
The Social ◽  
Set Up

This article sets out to explore the contributions of classical social thinkers to a sociological understanding of love. It builds on the premise that despite its major relevance and consequential importance in shaping both individual lives and the social world, until recently love was a heavily undertheorised topic in the sociological tradition. Moreover, the body of disparate sociological reflections that have been made on the social nature of love has been largely forgotten in the discipline’s intellectual legacy. The article then proceeds in unearthing the classics’ contributions to a sociology of love. It starts with Max Weber’s view that love promises to be a means of sensual salvation in an increasingly rationalised social world based on impersonal formal relationships. Next, it critically examines Pitirim A. Sorokin’s integral theory of love. It then moves to address Talcott Parsons’ view on love as a binding force whose social function is to integrate the conjugal couple of the modern nuclear family in the absence of the external pressures exerted by the kinship network. The article concludes by showing how these conceptualisations of love were all embedded in wider theoretical constructions set up to account for the modernisation process.

Selling the role of salvage: Cell salvage past and present

2020 ◽  
Vol 30 (11) ◽  
pp. 336-339
Author(s):  
Lucy Godfrey
Keyword(s):  
Large Scale ◽  
Emergency Situation ◽  
Cost Effective ◽  
The Body ◽  
Cell Salvage ◽  
Autologous Transfusion ◽  
Allogenic Transfusion ◽  
Set Up ◽  
Meta Analyses

The use of transfused blood, be it from an allogenic (donor) or autologous (same patient) source, is not a new treatment and in fact has been experimented with since the mid 1800s. The role of cell salvage and re-infusion of a patient’s own blood, however, has only begun to gain real popularity in the last 20 years, after the undertaking of several large scale meta-analyses which have shown that not only is autologous transfusion no less efficacious when compared to allogenic transfusion, but also potentially safer for a number of reasons. Autologous transfusion is also more cost effective overall and potentially quicker to initiate in an emergency situation. Despite the body of evidence to support the use of salvaged blood for transfusion, hesitation around its use still persists, with staff apprehension around set up of cell salvage equipment and general underestimation of intraoperative blood loss being key factors in its underuse.

scholarly journals Futurizing politics and the sustainability of real-world experiments: what role for innovation and exnovation in the German energy transition?

2019 ◽  
Vol 14 (4) ◽  
pp. 991-1000 ◽  
Author(s):  
Martin David ◽  
Matthias Gross
Keyword(s):  
Real World ◽  
Energy Production ◽  
Large Scale ◽  
Energy Transition ◽  
System Transformation ◽  
Conceptual Strategy ◽  
Set Up

Abstract The German energy transition towards more sustainable forms of energy production has been characterized as a large-scale or real-world experiment. Whereas experiments are open-ended processes set up explicitly to allow (or even generate) surprises, by contrast sustainability implies the pursuit of clearly defined, normative ends. Whereas much of the literature on system transformation builds on the concept of innovation, our hypothesis is that focusing on the “natural” flipside of innovation—called here “exnovation,” i.e., departing from unsustainable pathways—should also be seen as a valuable conceptual strategy for coping with the tension between the unavoidable indeterminacy resulting from unknown risks and the necessary amendment and redefinition of goals and rules. In this paper the German energy transition (Energiewende) is used to exemplify the recursive processes of experimentation that make it possible to accommodate surprise, and, thus, to conceptualize the unavoidable tension between innovation and the maintenance of older, unsustainable structures.

scholarly journals Effectiveness of Echinochrome on HFD-Induced Hyperlipidemia in Rats

2019 ◽  
Vol 9 (5) ◽  
pp. 337-344
Author(s):  
Sohair R. Fahmy ◽  
Nashwah Ismail Zaki ◽  
Shaimaa Zakaria Eid ◽  
Ayman Saber Mohamed ◽  
Sarah S. Hassanein
Keyword(s):  
High Fat Diet ◽  
The Body ◽  
Control Group ◽  
High Fat ◽  
Obese Rats ◽  
Liver Functions ◽  
Set Up ◽  
Antioxidant Markers ◽  
Kidney Functions ◽  
Group 1

Abstract Obesity has been identified with an expanded danger of a progression of illnesses that include different organ-frameworks of the body. In the present examination, we evaluated the hypolipidemic properties of Echinochrome (Ech) pigment in a high-fat diet (HFD) induced hyperlipidemia in rats. After the hyperlipidemic model was set up, rats were haphazardly separated into five groups as follows: normal control group, HFD group, Atorvastatin (ATOR) group (80 mg/kg), Ech group (1 mg/kg) and combined group ATOR + Ech. The outcomes demonstrated that Ech improves lipid profile, liver functions, kidney functions and antioxidant markers of obese rats. The findings of the present investigation indicated that the Ech possesses hypolipidemic potential in obese rats.

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