Selection of backfill grout for shallow geothermal systems: Materials investigation and thermo-physical analysis

Studying the effect of microwave fields on the intensification of heat and moisture exchange processes in a granular layer is a rather complicated task, which cannot be effectively solved without an adequate research methodology. In presented materials, a system of principles and approaches for studying processes of microwave-convective grain treatment has been discussed. Based on the explicitly defined process target, functional-physical analysis has been performed that made it possible to specify the most essential factors of process. Morphological analysis of processes shall be performed in several stages. At each stage, targets of process have to be set by excluding combinations of factors that have no reason to be considered at this particular stage of process development. Application of mathematical simulation methods is advisable for selection of optimal options.

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Physical Assessment of Marine Debris Along the Coast of Brunei Darussalam

Journal of Applied and Emerging Sciences ◽

10.36785/buitems.jaes.279 ◽

2019 ◽

pp. 144-152

Keyword(s):

Mitigation Strategies ◽

Marine Debris ◽

Physical Analysis ◽

Health Tourism ◽

Policy Makers ◽

Brunei Darussalam ◽

Global Issue ◽

The World ◽

Different Sources ◽

Selection Of

Debris along coastlines is a global issue as it affects ecosystem, human health, tourism and economy; thus, requires more attention from town planners, policy makers and researchers. Various studies have been conducted around the world to identify and quantify the debris, its sources and mitigation strategies; however, it is a pioneer study of its kind in Brunei Darussalam. The current study involves selection of different beaches, debris collection and its physical analysis. Brunei Darussalam has 161 km long coast along South China Sea and the debris was collected from four different beaches in the month of May considering different sources related to anthropogenic, riverine and sea-based activities. The selected areas for study were 110x30 m2 and collected samples were categorized by number, weight, size and colour. By number, large amount of plastic (91.46%) was found on all four beaches followed by miscellaneous materials. As, the most abundant type of debris was plastic, hence it was further classified on the basis of size and colour. Most of the materials found on these beaches were the result from land based human activities, but the contribution of debris through the waterways is also significant.

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Estimation of Cement Thermal Properties through the Three-Phase Model with Application to Geothermal Wells

Energies ◽

10.3390/en11102839 ◽

2018 ◽

Vol 11 (10) ◽

pp. 2839 ◽

Cited By ~ 2

Author(s):

Adonis Ichim ◽

Catalin Teodoriu ◽

Gioia Falcone

Keyword(s):

Heat Transfer ◽

Thermal Properties ◽

Working Fluid ◽

Geothermal Systems ◽

Well Performance ◽

Three Phase ◽

Geothermal Wells ◽

Ancient Times ◽

Efficient Heat Transfer ◽

Selection Of

Geothermal energy has been used by mankind since ancient times. Given the limited geographical distribution of the most favorable resources, exploration efforts have more recently focused on unconventional geothermal systems targeting greater depths to reach sufficient temperatures. In these systems, geothermal well performance relies on efficient heat transfer between the working fluid, which is pumped from surface, and the underground rock. Most of the wells designed for such environments require that the casing strings used throughout the well construction process be cemented in place. The overall heat transfer around the wellbore may be optimized through accurate selection of cement recipes. This paper presents the application of a three-phase analytical model to estimate the cement thermal properties. The results show that cement recipes can be designed to enhance or minimize heat transfer around wellbore, extending the application of geothermal exploitation.

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Antiviral Drug Discovery Strategy Using Combinatorial Libraries of Structurally Constrained Peptides

Journal of Virology ◽

10.1128/jvi.78.14.7410-7417.2004 ◽

2004 ◽

Vol 78 (14) ◽

pp. 7410-7417 ◽

Cited By ~ 33

Author(s):

Eléonore Real ◽

Jean-Christophe Rain ◽

Véronique Battaglia ◽

Corinne Jallet ◽

Pierre Perrin ◽

...

Keyword(s):

Drug Discovery ◽

Antiviral Activity ◽

Rabies Virus ◽

Mammalian Cells ◽

Combinatorial Libraries ◽

Biologically Active ◽

Physical Analysis ◽

Constrained Peptides ◽

Pharmacologically Active ◽

Selection Of

ABSTRACT We have developed a new strategy for antiviral peptide discovery by using lyssaviruses (rabies virus and rabies-related viruses) as models. Based on the mimicry of natural bioactive peptides, two genetically encoded combinatorial peptide libraries composed of intrinsically constrained peptides (coactamers) were designed. Proteomic knowledge concerning the functional network of interactions in the lyssavirus transcription-replication complex highlights the phosphoprotein (P) as a prime target for inhibitors of viral replication. We present an integrated, sequential drug discovery process for selection of peptides with antiviral activity directed against the P. Our approach combines (i) an exhaustive two-hybrid selection of peptides binding two phylogenetically divergent lyssavirus P's, (ii) a functional analysis of protein interaction inhibition in a viral reverse genetic assay, coupled with a physical analysis of viral nucleoprotein-P complex by protein chip mass spectrometry, and (iii) an assay for inhibition of lyssavirus infection in mammalian cells. The validity of this strategy was demonstrated by the identification of four peptides exhibiting an efficient antiviral activity. Our work highlights the importance of P as a target in anti-rabies virus drug discovery. Furthermore, the screening strategy and the coactamer libraries presented in this report could be considered, respectively, a general target validation strategy and a potential source of biologically active peptides which could also help to design pharmacologically active peptide-mimicking molecules. The strategy described here is easily applicable to other pathogens.

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GaS_GeoT: A computer program for an effective use of newly improved gas geothermometers in predicting reliable geothermal reservoir temperatures

Geothermal Energy ◽

10.1186/s40517-020-00182-9 ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

A. Acevedo-Anicasio ◽

E. Santoyo ◽

D. Pérez-Zárate ◽

Kailasa Pandarinath ◽

M. Guevara ◽

...

Keyword(s):

Computer Program ◽

Geothermal Reservoir ◽

Geothermal Systems ◽

Practical Application ◽

Effective Use ◽

First Time ◽

Optimal Evaluation ◽

Prediction Efficiency ◽

Statistical Metrics ◽

Selection Of

AbstractA geochemometric study based on a multi-criteria decision analysis was applied, for the first time, for the optimal evaluation and selection of artificial neural networks, and the prediction of geothermal reservoir temperatures. Eight new gas geothermometers (GasG1 to GasG8) were derived from this study. For an effective and practical application of these geothermometers, a new computer program GaS_GeoT was developed. The prediction efficiency of the new geothermometers was compared with temperature estimates inferred from twenty-five existing geothermometers using gas-phase compositions of fluids from liquid- (LIQDR) and vapour-dominated (VAPDR) reservoirs. After applying evaluation statistical metrics (DIFF%, RMSE, MAE, MAPE, and the Theil's U test) to the temperature estimates obtained by using all the geothermometers, the following inferences were accomplished: (1) the new eight gas geothermometers (GasG1 to GasG8) provided reliable and systematic temperature estimates with performance wise occupying the first eight positions for LIQDR; (2) the GasG3 and GasG1 geothermometers exhibited consistency as the best predictor models by occupying the first two positions over all the geothermometers for VAPDR; (3) the GasG3 geothermometer exhibited a wider applicability, and a better prediction efficiency over all geothermometers in terms of a large number of samples used (up to 96% and 85% for LIQDR and VAPDR, respectively), and showed the smallest differences between predicted and measured temperatures in VAPDR and LIQDR; and lastly (4) for the VAPDR, the existing geothermometers ND84c, A98c, and ND98b sometimes showed a better prediction than some of the new gas geothermometers, except for GasG3 and GasG1. These results indicate that the new gas geothermometers may have the potential to become one of the most preferred tools for the estimation of the reservoir temperatures in geothermal systems.

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Optimal Operation of Small Geothermal Systems Through Entropy Generation Analysis

Volume 2: Dynamics, Vibration and Control; Energy; Fluids Engineering; Micro and Nano Manufacturing ◽

10.1115/esda2014-20493 ◽

2014 ◽

Author(s):

Sara Cosentino ◽

Adriano Sciacovelli ◽

Vittorio Verda

Keyword(s):

Entropy Generation ◽

Fluid Dynamic ◽

Optimal Operation ◽

Operating Conditions ◽

Entire System ◽

Geothermal Systems ◽

Proper Selection ◽

Transient Model ◽

Thermal Phenomena ◽

Selection Of

Geothermal systems often experience non homogeneous behavior between the various boreholes, due to possible issues in the installation or to differences in the stratigraphy. In the case of small systems, this may create important inefficiencies or operational problems. In this paper, the use of entropy generation analysis is proposed in order to optimize the global performances, taking fluid dynamic and thermal phenomena into account. The possible anomalous scenarios that are considered include borehole ovalization and differences in the heat transfer between borehole and ground due to fouling, groundwater level, etc. The analysis is conducted considering a transient model of the entire system, composed by the ground, boreholes and heat pump. Various operating scenarios are also considered. Results show that non negligible improvements in the efficiency can be obtained by proper selection of the operating conditions.

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A study on generating a map for selection of optimum power generation cycles used for Enhanced Geothermal Systems

Energy ◽

10.1016/j.energy.2017.05.130 ◽

2017 ◽

Vol 133 ◽

pp. 502-512 ◽

Cited By ~ 11

Author(s):

Jialing Zhu ◽

Kaiyong Hu ◽

Wei Zhang ◽

Xinli Lu

Keyword(s):

Power Generation ◽

Enhanced Geothermal Systems ◽

Geothermal Systems ◽

Selection Of

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Cognitive gadgets and cognitive priors

Behavioral and Brain Sciences ◽

10.1017/s0140525x19000992 ◽

2019 ◽

Vol 42 ◽

Author(s):

Gian Domenico Iannetti ◽

Giorgio Vallortigara

Keyword(s):

Cognitive Neuroscience ◽

Selection Of

Abstract Some of the foundations of Heyes’ radical reasoning seem to be based on a fractional selection of available evidence. Using an ethological perspective, we argue against Heyes’ rapid dismissal of innate cognitive instincts. Heyes’ use of fMRI studies of literacy to claim that culture assembles pieces of mental technology seems an example of incorrect reverse inferences and overlap theories pervasive in cognitive neuroscience.

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Note on Selection of Coordinate Systems for Geodynamics

International Astronomical Union Colloquium ◽

10.1017/s0252921100051174 ◽

1975 ◽

Vol 26 ◽

pp. 395-407

Author(s):

S. Henriksen

Keyword(s):

Sea Level ◽

The Other ◽

Coordinate Systems ◽

Mean Sea Level ◽

The Earth ◽

The One ◽

Static Systems ◽

Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

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Measurements of the Cape Astrometric Survey of the Southern Hemisphere

International Astronomical Union Colloquium ◽

10.1017/s0252921100074534 ◽

1978 ◽

Vol 48 ◽

pp. 515-521

Author(s):

W. Nicholson

Keyword(s):

Southern Hemisphere ◽

Automatic Measuring ◽

Measuring Machine ◽

Final Selection ◽

Selection Of

SummaryA routine has been developed for the processing of the 5820 plates of the survey. The plates are measured on the automatic measuring machine, GALAXY, and the measures are subsequently processed by computer, to edit and then refer them to the SAO catalogue. A start has been made on measuring the plates, but the final selection of stars to be made is still a matter for discussion.

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