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on 01-Sep-2018 (Sat)

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Flashcard 3268452420876

Question
The five reasons for persistent obstructive symptoms following a pull-through are
Answer
These include
  1. mechanical obstruction
  2. persistent or acquired aganglionosis
  3. hypoganglionosis
  4. transition zone pull-through
  5. internal sphincter achalasia
  6. disordered motility in the proximal intestine that contains ganglion cells
  7. functional megacolon caused by stool-holding behavior


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Flashcard 3268453469452

Question
[default - edit me]
Answer
These include mechanical obstruction, persistent or acquired agangli- onosis, hypoganglionosis, or transition zone pull-through, internal sphincter achalasia, disordered motility in the proximal intestine that contains ganglion cells, or func- tional megacolon caused by stool-holding behavior


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Flashcard 3268457663756

Question
Causes of mechanical obstruction include
Answer
  1. an anastomotic stricture
  2. twisting of the pull-through bowel
  3. “rolling down” of the rectal muscular cuff after a Soave procedure
  4. “kinking” of the anastomosis
  5. compression by the aganglionic pouch after a Duhamel procedure


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Recent studies reveal that low-permeability chalk properties are dependent on clay content and cementation.

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(A) a porous micritic chalk, (B) a cemented chalk and (C) an argillaceous chalk.

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By using MATLAB ® and Avizo ® softwares, relevant pore data were extracted, including pore volumes, lengths and network tortuosity.

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Results show that the pore length is reduced in tight chalks, with 140 nm on average in argillaceous chalk and 533 nm in cemented chalk, compared to 1091 nm in micritic reservoir chalk.

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In order to understand fluid transport, fluid flow was simulated on each sample using the Lattice Boltzmann Method (LBM), which allows visualising fluid pathways and calculating perme- abilities.

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The rest of the chalk is described as non-reservoir chalk or tight chalk (Mallon and Swarbrick, 2002; Lindgreen et al., 2012), and yields permeability values lower than 0.2 mD, as defined by the Joint Chalk Research (Bailey et al., 1999).

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Pores within tight rocks are several orders of magnitude smaller than those in conventional carbonate and sandstone reservoir rock materials (Berton- cello and Honarpour, 2013; Song et al., 2016a).

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Computer tomography is applied successfully in micropo- rous rocks, but it does not offer the resolution needed to capture the structure of nanoporous networks

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IB-SEM ad- vancements allow researchers to view consecutive slices of tens of nanometer thickness with a pixel resolution of a few tens of nanometers, i. e. the so-called mesoscopic scale

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The aim of this study is to investigate three typical chalk microtextures as defined by Faÿ- Gomord et al. (2016): (A) micritic chalk with good reservoir quality, (B) calcite cemented chalk and (C) argillaceous chalk, the last two being both considered as tight chalks.

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