scholarly journals Using Pedotransfer Function (PTF) analysis in the assessment of the parameters of potential radionuclide transport through the vadose zone of PRAW “Novi Han” – an initial stage of a model case study

2019 ◽  
Vol 48 (2) ◽  
pp. 3-12
Author(s):  
Dimitar Antonov ◽  
Nikolay Stoyanov ◽  
Aleksey Benderev
Keyword(s):  
Vadose Zone ◽  
Hydraulic Parameters ◽  
Radionuclide Transport ◽  
Pedotransfer Function ◽  
Radionuclide Migration ◽  
Detailed Characterization ◽  
Model Case ◽  
Initial Stage

The Repository for Radioactive Waste in Novi Han, Lozen Mountain (Bulgaria), dates from the early 1960s. In the present study, the complex geoenvironmental setting of the repository site was analysed from the viewpoint of assessment of potential radionuclide migration from the repository to the geosphere. Thus, components of the mass transport field were elaborated as a part of a conceptual model. In connection with this, a detailed characterization of the subsurface, especially of the vadose zone around the repository, was performed. The fractions of sand, silt and clay based on the grain-size distribution curves of samples from the different hydrogeological units gathered on the site of RAW-Novi Han were implemented in the ROSETTA program, and the respective hydraulic parameters were determined. As a result, the entire vadose zone was hydraulically determined.

scholarly journals Characterization of the vadose flow and its influence on the functioning of karst springs: Case study of the karst system near Postojna, Slovenia

2012 ◽  
Vol 41 (1) ◽  
Author(s):  
Janja Kogovšek ◽  
Metka Petrič
Keyword(s):  
Vadose Zone ◽  
Pressure Pulse ◽  
Karst Aquifer ◽  
Detailed Comparison ◽  
Karst System ◽  
Lower Saturation ◽  
Actual Mass ◽  
Rapid Transfer

In three selected drips in the Postojna cave in SWw Slovenia and in the nearby Korentan spring, which in general belongs to the same karst aquifer, the discharge and electrical conductivity were measured at 15-minute intervals. Simultaneously, the meteorological parameters in Postojna were measured and the effective infiltration was assessed. The data obtained in the period of one hydrological year, 2003–2004, was compared in order to study the influence of the vadose flow on the characteristics of groundwater flow in a karst system and on the functioning of a karst spring. The highest discharges of the Korentan spring are the result of the inflow of water through a hierarchy of fissures of various permeabilities within the vadose zone, but the contribution of stored water from low-permeability zones is especially important. One of our most significant findings is that in the conditions of high saturation of the vadose zone, the network of small fissures is hydraulically connected, which enables an integral reaction of the system to the pressure pulse induced by infiltrated precipitation. On the other hand, a detailed comparison of effective infiltration and discharge indicates that in dry periods with a lower saturation of the vadose zone, the infiltrated precipitation is mainly stored in the system and only the most permeable fissures enable a rapid transfer of the recharge impulses toward the spring. Data on measured discharge and conductivity were additionally compared in order to study the complex conditions of the actual mass flow of water through the system.Key words: karst aquifer, vadose zone, Postojna Cave, Korentan spring, Slovenia

scholarly journals Spectroscopic characterization of the atmospheres of potentially habitable planets: GL 581 d as a model case study

2011 ◽  
Vol 534 ◽  
pp. A26 ◽  
Author(s):  
P. von Paris ◽  
J. Cabrera ◽  
M. Godolt ◽  
J. L. Grenfell ◽  
P. Hedelt ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Model Case ◽  
Habitable Planets

scholarly journals Creating customer value from data: foundations and archetypes of analytics-based services

2021 ◽  
Author(s):  
Fabian Hunke ◽  
Daniel Heinz ◽  
Gerhard Satzger
Keyword(s):  
Decision Making ◽  
Customer Value ◽  
Digital Transformation ◽  
Competitive Advantages ◽  
Detailed Characterization ◽  
Specific Service ◽  
Service Portfolio ◽  
Service Type

AbstractThe digital transformation offers new opportunities for organizations to expand their existing service portfolio in order to achieve competitive advantages. A popular way to create new customer value is the offer of analytics-based services (ABS)—services that apply analytical methods to data to empower customers to make better decisions and to solve complex problems. However, research still lacks to provide a profound conceptualization of this novel service type. Similarly, actionable insights on how to purposefully establish ABS in the market to enrich the service portfolio remain scarce. We perform a cluster analysis of 105 ABS and triangulate it with a revelatory case study to identify four generic ABS archetypes and to unveil their specific service objectives and characteristics. We also isolate essential factors that shape decision-making regarding the choice of adequate archetypes and subsequent transitions between them. The detailed characterization of different ABS types contributes to a more profound theorizing process on ABS as well as provides a systematization for strategic opportunities to enrich service portfolios in practice.

Characterization of Adhesion Interlayer Between Rubber and Brass by a Novel Method of Sample Preparation

2007 ◽  
Vol 80 (1) ◽  
pp. 61-82 ◽  
Author(s):  
Takeshi Hotaka ◽  
Yasuhiro Ishikawa ◽  
Kunio Mori
Keyword(s):  
Filter Paper ◽  
Copper Sulfide ◽  
Hot Water ◽  
Rubber Matrix ◽  
Detailed Characterization ◽  
Initial Stage ◽  
Brass Surface ◽  
Novel Method ◽  
Clean Interface

Abstract Instrumental characterization of an adhesion interface in a rubber-brass system often faces a difficulty in exposing a clean surface due to a stick of rubber residue on a brass surface. We have succeeded in isolating an interface from the rubber matrix by inserting a filter paper between rubber and brass during the vulcanization. Clean interface was obtained by removing the filter paper after the vulcanization, enabling a detailed characterization of the interface by XPS and SEM-EDX from a practical rubber formulation. Formulation of cobalt naphthenate did not contribute to a formation of adhesion interlayer in an initial stage of cure, but greatly affected the composition of copper sulfide during the vulcanization. It was found that a dosage of cobalt improved a growth of interface at aging. Copper sulfide particles were found to be spherical at the interface for unaged specimens. It was revealed that excess growth of copper sulfide was a main feature at a humidity aging, while the growth of zinc oxide was eminent under a hot water aging. Scheme of an aging reaction was considered to depend on an interaction between brass and external factors such as heat, water, and oxygen.

A Combined Approach to Characterization of Dent With Metal Loss

2012 ◽  
Author(s):  
Rick Yahua Wang ◽  
Richard Kania ◽  
Udayasankar Arumugam ◽  
Ming Gao
Keyword(s):  
Mechanical Damage ◽  
Practical Experience ◽  
Metal Loss ◽  
Combined Approach ◽  
Detailed Characterization ◽  
Strain Limit ◽  
Study Results ◽  
Damage Criteria

Current in-line inspection technologies (e.g., Caliper/MFL or Combo) for mechanical damage characterization can detect dent with metal loss but with limited ability to discriminate metal loss between corrosion, gouge and crack with certainty. There are also some cases that metal loss signals were detected but not reported by ILI vendors because of either signals below threshold for reporting or other reasons. Practical experience showed that, with assistance of strain based dent analysis and strain limit damage criteria; detailed characterization of MFL tri-axial signals could effectively facilitate to discriminate metal loss features and identify potential risk of cracks or gouges in the dent. In this paper, the newly developed approach is utilized to identify the critical dents in the pipelines and discriminate those dents associated with metal loss reported by combined ILI technologies. A case study was performed with four real dent features, as an example to demonstrate the effectiveness of this approach. The details of the case study, results and findings are summarized in this paper.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

Characterization of the Initial Stage of Discharges between Micro-gap in Liquid using Optical Measurement

2010 ◽  
Vol 130 (4) ◽  
pp. 313-318
Author(s):  
Makoto Kanemaru ◽  
Shohei Sorimachi ◽  
Shinji Ibuka ◽  
Shozo Ishii
Keyword(s):  
Optical Measurement ◽  
Initial Stage
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