Void formation during RTM: An experimental and analytical study on the influence of bundle porosity on void formation during liquid composite molding in woven fabrics

Mechanical air entrapment, void compression and void dissolution are the main mechanisms behind void formation in liquid composite molding. Mechanical air entrapment is induced by the highly non-uniform geometry at the meso- and micro-scale and the heterogeneous properties of the reinforcing material. This results in differences in the velocity...

Basic properties of cement paste mixed with calcium hydroxide-ettringite composite type expansive additive

In this study, we targeted a calcium hydroxide and ettringite composite-type expansive additive (EA) and obtained the basic characteristics of the EA mixed cement paste in order to create a method for calculating volume expansion based on the hydration reaction of the PCEA system. Expansion strain, setting time, and compressive strength were...

Basic properties of cement paste mixed with calcium hydroxide-ettringite composite type expansive additive

In this study, we targeted a calcium hydroxide and ettringite composite-type expansive additive (EA) and obtained the basic characteristics of the EA mixed cement paste in order to create a method for calculating volume expansion based on the hydration reaction of the PCEA system. Expansion strain, setting time, and compressive strength were...

The Biographies of Bodily Ornaments from Indigenous Settlements of the Dominican Republic (AD 800–1600)

In this study, we generate novel insights regarding bodily ornaments from indigenous societies of late precolonial Greater Antilles. Previous research has highlighted the sociopolitical role of valuable, exotic, and figurative ornaments, yet there are many gaps in our current understanding of these artifacts. Here, we focus on ornaments from...

Ceramic-faience hybrids were used to recycle bronze in North-Western European Iron Age egg-shaped crucibles

We investigated the characteristics of a group of 13 Middle Iron Age egg-shaped crucibles and crucible fragments from Tilburg (The Netherlands). We used a combination of optical and chemical analyses, including hand-held XRF, microCT scanning and 3-D printing polarizing light microscopy and SEM-EDX. The chemical analyses confirmed that the...

Enhancing the mechanical properties of fused filament fabricated parts by elevating the print room temperature

Additive manufacturing (AM) is currently making a transition from mainly being used for prototyping to an alternative for conventional production methods. AM provides more freedom in design geometry combined with the possibility to produce (complex) products in low quantities. As a result, the need arises for printed parts with consistent...

Non-enzymatic cross-linking of collagen type II fibrils is tuned via osmolality switch

An important aspect in cartilage ageing is accumulation of advanced glycation end products (AGEs) after exposure to sugars. Advanced glycation results in cross-links formation between the collagen fibrils in articular cartilage, hampering their flexibility and making cartilage more brittle. In the current study, we investigate whether...

Effects of Thermal Shock on the Creation of Microfractures and Mechanical Properties of Various Volcanic Rock Types, including Samples from the Indonesian Geothermal Field (Tangkuban Perahu)

This thesis aims at investigating the effect of a thermal shock of a couple of hundred degrees on the creation of the thermal microfractures and in what way the mechanical properties of volcanic rocks change. In the geothermal field, thermal microfractures can contribute to increase the permeability and produce more steam to the surface. We...

X-ray micro-CT investigation of metal recycling in egg-shaped crucibles during the Middle Iron Age

During the extension of a sport complex near Tilburg, The Netherlands, some archeological objects were discovered. Some shreds of pottery seem to confirm that the objects found were originating from the Middle Iron Age.1 Some of the objects were egg-shaped and hollow, with a small opening on the tip. The objects did awaken the thought that they...

Image Degradation in High Speed Flat-Panel Detector Micro-CT

The aim of this report is to investigate the best possible image quality for high-speed flat-panel detector micro-CT. Specifically, the aim is to investigate the severity of image distortion as a result from the high rotational and acquisition speed. The best possible acquisition mode for high-speed micro-CT is investigated by scanning a ...

Salt precipitation due to supercritical gas injection: I. Capillary-driven flow in unimodal sandstone

Drying and salt precipitation in geological formations can have serious consequences for upstream operations in terms of injectivity and productivity. Here we investigate the consequences of supercritical CO2 injection in sandstones. The reported findings are directly relevant for CO2 sequestration and acid–gas injection operations, but might...

Petrophysical quantification of Utah reservoir sandstones and cap-rocks naturally exposed to CO2 fluid fluxes by use of high-resolution Micro CT

CO2 emission is increasing globally, resulting in a global increase in temperature and as a result climate change. CO2 storage in the subsurface is an option/ transitional measure to reduce CO2 in the atmosphere and mitigate the climate change issue. Generally, for CO2 storage to be a viable option, it must be ensured that the stored gasses...

Petrophysical Characterization of Gas Reservoir Rock Samples using High Resolution Micro-CT Images

Petrophysical analysis of reservoir rocks constitutes an integral part of hydrocarbon exploration and production. Properties such as porosity and permeability greatly influence decision making in all phases of planning and execution of oil and gas activities. Furthermore, the industry and academia are equally interested in the in-depth...

Micro Computer Tomography Study of Potassium Iodide Precipitation in Bentheimer Sandstone Caused by Flow-through CO2 Drying

Storage of CO2 in depleted gas reservoirs and saline aquifers is being considered to prevent its emission to the atmosphere and thus the subsequent climate changing effects. The injection of large amounts of anhydrous carbon dioxide in the under- ground will lead to salt precipitation as connate water evaporates in the CO2 flux. This...

Integrated visualization of multi-angle bioluminescence imaging and micro CT

This paper explores new methods to visualize and fuse multi-2D bioluminescence imaging (BLI) data with structural imaging modalities such as micro CT and MR. A geometric, back-projection-based 3D reconstruction for superficial lesions from multi-2D BLI data is presented, enabling a coarse estimate of the 3D source envelopes from the multi-2D BLI...