scholarly journals Transmissivity Estimates by Specific Capacity Data of Some Fractured Italian Carbonate Aquifers

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1374
Author(s):  
Daniela Valigi ◽  
Costanza Cambi ◽  
Roberto Checcucci ◽  
Lucio Di Matteo
Keyword(s):  
Porous Media ◽  
Central Italy ◽  
Specific Capacity ◽  
Vertical Flow ◽  
Karst Aquifers ◽  
Carbonate Aquifers ◽  
Spatial Characterization ◽  
Capacity Data ◽  
Scarce Data

Transmissivity estimates can be obtained by different approaches, mainly analytical and empirical. The application of analytical methods requires checking non-linear well losses due to turbulence and vertical flow related to partial penetration. The empirical approach relates transmissivity values to specific capacity data measured in the same well. The interpretation of available pumping tests highlights porous media solutions’ applicability in most of the step-drawdown curves analyzed. Double or triple porosity approaches are more appropriate only for wells located close to fault systems. In this work, a new relationship to estimate transmissivity by specific capacity data in some Italian carbonate aquifers is proposed. The comparison with other relationships available in the literature for similar aquifers worldwide confirms the validity of a general equation for carbonate aquifers, helping the spatial characterization of aquifer transmissivity in scarce data regions. Nonetheless, the use of equations of the same kind with different coefficients allows good results on our set of data. Results can improve the knowledge of fractured–karst aquifers by also including data from Central Italy.

GEOPHYSICAL CHARACTERIZATION OF KARST AQUIFERS USING DYNAMIC RECHARGE EVENTS

2017 ◽  
Author(s):  
Andrew J. Luhmann ◽  
◽  
Susan L. Bilek ◽  
Ronni Grapenthin ◽  
Jonathan B. Martin
Keyword(s):  
Karst Aquifers ◽  
Geophysical Characterization

scholarly journals Lamellar Polypyrene Based on Attapulgite–Sulfur Composite for Lithium–Sulfur Battery

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 483
Author(s):  
Jing Wang ◽  
Riwei Xu ◽  
Chengzhong Wang ◽  
Jinping Xiong
Keyword(s):  
Cathode Material ◽  
Current Density ◽  
High Current Density ◽  
Specific Capacity ◽  
Lithium Sulfur Batteries ◽  
Rate Test ◽  
Sulfur Battery ◽  
Lower Capacity ◽  
Lithium Sulfur

We report on the preparation and characterization of a novel lamellar polypyrrole using an attapulgite–sulfur composite as a hard template. Pretreated attapulgite was utilized as the carrier of elemental sulfur and the attapulgite–sulfur–polypyrrole (AT @400 °C–S–PPy) composite with 50 wt.% sulfur was obtained. The structure and morphology of the composite were characterized with infrared spectroscopy (IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). An AT @400 °C–S–PPy composite was further utilized as the cathode material for lithium–sulfur batteries. The first discharge specific capacity of this kind of battery reached 1175 mAh/g at a 0.1 C current rate and remained at 518 mAh/g after 100 cycles with capacity retention close to 44%. In the rate test, compared with the polypyrrole–sulfur (PPy–S) cathode material, the AT @400 °C–S–PPy cathode material showed lower capacity at a high current density, but it showed higher capacity when the current came back to a low current density, which was attributed to the “recycling” of pores and channels of attapulgite. Therefore, the lamellar composite with special pore structure has great value in improving the performance of lithium–sulfur batteries.

scholarly journals Fast camera spatial characterization of photonic polarization entanglement

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Christopher Ianzano ◽  
Peter Svihra ◽  
Mael Flament ◽  
Andrew Hardy ◽  
Guodong Cui ◽  
...  
Keyword(s):  
Spatial Characterization

Characterization of structural inhomogeneities in porous media

AIChE Journal ◽  
1995 ◽  
Vol 41 (4) ◽  
pp. 894-906 ◽  
Author(s):  
Lynn F. Gladden ◽  
Michael P. Hollewand ◽  
Paul Alexander
Keyword(s):  
Porous Media ◽  
Structural Inhomogeneities
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