Document Server@UHasselt
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Repository of the University of Hasselt containing publications in the fields of statistics, computer science, information strategies and material from the Institute for behavioural sciences.
Mostrando recursos 1 - 16 de 16
1.
Flash co-pyrolysis of biomass with polylactic acid. Part 1: Influence on bio-oil yield and heating value - CORNELISSEN, Tom; YPERMAN, Jan; REGGERS, Guy; SCHREURS, Sonja; CARLEER, Robert
High amounts of water present in bio-oil are one of the major drawbacks for its utilisation as a fuel. One technology that shows the potential to satisfy the demand for bio-oil with a reduced water content is the flash co-pyrolysis of biomass with polylactic acid, PLA. The influence of PLA on the pyrolysis of willow is investigated with a semi-continuous home-built pyrolysis reactor. Flash co-pyrolysis of willow/PLA blends (10: 1, 3: 1, 1:1 and 1:2) show synergetic interaction. A higher bio-oil yield and a lower water content as a function of the willow/PLA ratios are obtained. Among the tested blends,...
2.
Flash co-pyrolysis of biomass with polyhydroxybutyrate: Part 1. Influence on bio-oil yield, water content, heating value and the production of chemicals - CORNELISSEN, Tom; Jans, M; YPERMAN, Jan; REGGERS, Guy; SCHREURS, Sonja; CARLEER, Robert
Bio-oil obtained via flash pyrolysis shows potential to be applied as a renewable fuel. However, bio-oil often contains high amounts of water, which is a major drawback for its application. The influence of a biopolymer - polyhydroxybutyrate (PHB) on the pyrolysis of willow is investigated using a semi-continuous home-built pyrolysis reactor. The flash co-pyrolysis of willow/PHB blends (w/w ratio 7:1, 3:1, 2:1 and 1:1) clearly shows particular merits: a synergetic increase in pyrolysis yield, a synergetic reduction of the water content in bio-oil, an increase in heating value, and a production of easily separable chemicals. The occurrence of synergetic interactions...
3.
Observations in proximal interphalangeal flexion of the finger - VAN ZWIETEN, Koos Jaap; LIPPENS, Peter; GELAN, Jan; ADRIAENSENS, Peter; Thywissen, C.; Gens, F.
The extensor assembly of the finger, consisting of tendon fibers from extrinsic and intrinsic finger muscles, rearranged into one medial bundle and two lateral bundles, undergoes distal displacement during proximal interphalangeal flexion. The lateral bundles, conjoining distally into one terminal extensor tendon for the distal phalanx, lie slack alongside the flexed proximal interphalangeal joint (Landsmeer, 1976). The distal phalanx becomes loose, thus allowing simultaneous distal interphalangeal flexion.
During unresisted flexion of the proximal interphalangeal joint of the finger, without simultaneous distal interphalangeal flexion, the phenomenon of the floating distal phalanx can be observed (Tubiana et al., 1996).
To further investigate this...
4.
Observations in proximal interphalangeal flexion of the finger - VAN ZWIETEN, Koos Jaap; LIPPENS, Peter; GELAN, Jan; ADRIAENSENS, Peter; Thywissen, C.; Gens, F.
The extensor assembly of the finger, consisting of tendon fibers from extrinsic and intrinsic finger muscles, rearranged into one medial bundle and two lateral bundles, undergoes distal displacement during proximal interphalangeal flexion. The lateral bundles, conjoining distally into one terminal extensor tendon for the distal phalanx, lie slack alongside the flexed proximal interphalangeal joint (Landsmeer, 1976). The distal phalanx becomes loose, thus allowing simultaneous distal interphalangeal flexion.
During unresisted flexion of the proximal interphalangeal joint of the finger, without simultaneous distal interphalangeal flexion, the phenomenon of the floating distal phalanx can be observed (Tubiana et al., 1996).
To further investigate this...
5.
Femoral Neck Trabecular Microstructure in Ovariectomized Ewes Treated With Calcitonin: MRI Microscopic Evaluation - Jiang, Y.; Zhao, J.; GEUSENS, Piet; Liao, E-Y.; ADRIAENSENS, Peter; GELAN, Jan; Azria, M.; Boonen, S.; Caulin, F.; Lynch, J.A.; Ouyang, X.; Genant, H.K.
Ovariectomy induces deterioration of the trabecular structure in the femoral neck of ewes, as
depicted by MR microscopic imaging. This structural deterioration is prevented by salmon calcitonin treatment.
Introduction: This study evaluated the trabecular (Tb) microarchitecture of an ovariectomy (OVX)-induced
osteoporotic model in ewes and determined the effects of salmon calcitonin (sCT), an osteoclast inhibitor, on
the Tb structure. This is the first report of OVX-induced changes in the Tb structure in the femoral neck in
the ewes and effect of sCT on the microarchitecture.
Materials and Methods: Ewes (58 years old, nr 28) were equally allocated into sham (Sham), OVX injected
with vehicle, or OVX injected...
6.
Study of bio-oils and solids from flash pyrolysis of sewage sludges - Pokorna, E.; POSTELMANS, Niels; Jenicek, P.; SCHREURS, Sonja; CARLEER, Robert; YPERMAN, Jan
The aim of this study was to evaluate the production of pyrolysis oil from three types of sewage sludges. The flash pyrolysis was performed at 500 degrees C, the maximum oil yield was 43.1%, and the water content in bio-oils obtained from secondary sludges was relatively low - 10.3% and 17.0%. GC-MS results showed that pyrolytic bio-oils of studied sludges dominantly contained fatty acids and nitrogenous compounds with potential added value. Obtained solids had high ash content and low calorific value which make them unattractive for use in incineration. FT-IR results showed that solids gave similar IR features as notified...
7.
Fast pyrolysis of heavy metal contaminated willow: Influence of the plant part - LIEVENS, Caroline; CARLEER, Robert; CORNELISSEN, Tom; YPERMAN, Jan
Fast pyrolysis of heavy metal contaminated willow, with high concentrations of Cd, Cu, Pb and Zn, resulting from phytoremediation, is investigated. The distribution of the heavy metals depends on the plant part (leaves and branches). Nevertheless, their individual pyrolysis fractions (at an operational temperature of 623 K), i.e., bio-oil/tar and gas, are both heavy metal free. Some small differences in the kind and amounts of the organic compounds are found in the bio-oil and gaseous fraction. In view of practical considerations leaves and branches should nevertheless be pyrolysed simultaneously. The use of hyphenated thermal analytical techniques allows obtaining more detailed...
8.
Macro- and micro-anatomical, histological and computed tomography scan characterization of the nasopalatine canal - Liang, Xin; Jacobs, Reinhilde; MARTENS, Wendy; Hu, Yu Qian; ADRIAENSENS, Peter; Quirynen, Marc; LAMBRICHTS, Ivo
P>Aim To determine the human anatomic variability of the nasopalatine canal and determine its characteristics using an anatomical, histological and computed tomography (CT) scan evaluation. Materials and Methods Measurements for the canal characteristics were carried out on 163 dry human skulls and 120 upper jaw spiral CT scans, taken from patients for pre-operative planning purposes of implant placement in the incisor region. Furthermore, four human cadaver specimens were imaged using a high-resolution magnetic resonance imaging (HR-MRI) unit. Afterwards, these specimens were serially sectioned for histological examination to evaluate the nasopalatine canal region and its content. Results The nasopalatine canal anatomy...
11.
House dust as possible route of environmental exposure to cadmium and lead in the adult general population - Hogervorst, Janneke; PLUSQUIN, Michelle; VANGRONSVELD, Jaco; Nawrot, Tim; CUYPERS, Ann; Van Hecke, Etienne; Roels, Harry; CARLEER, Robert; Staessen, Jan
Contaminated soil particles and food are established routes of exposure. We investigated the relations between biomarkers of exposure to cadmium and lead, and the metal loading rates in house dust in the adult residents of an area with a soil cadmium concentration of >= 3 mg/kg (n = 268) and a reference area (n = 205). We determined the metal concentrations in house dust allowed to settle for 3 months in Petri dishes placed in the participants' bedrooms. The continuously distributed vegetable index was the first principal component derived from the metal concentrations in six different vegetables. The biomarkers of...
12.
Macro- and micro-anatomical, histological and computed tomography scan characterization of the nasopalatine canal. - LIANG, Xin; Jacobs, R; Martens, W; Hu, Y; ADRIAENSENS, Peter; Quirynen, M; LAMBRICHTS, Ivo
To determine the human anatomic variability of the nasopalatine canal and determine its characteristics using an anatomical, histological and computed tomography (CT) scan evaluation. Materials and Methods: Measurements for the canal characteristics were carried out on 163 dry human skulls and 120 upper jaw spiral CT scans, taken from patients for pre-operative planning purposes of implant placement in the incisor region. Furthermore, four human cadaver specimens were imaged using a high-resolution magnetic resonance imaging (HR-MRI) unit. Afterwards, these specimens were serially sectioned for histological examination to evaluate the nasopalatine canal region and its content. Results: The nasopalatine canal anatomy showed...
13.
Macro- and micro-anatomical, histological and computed tomography scan characterization of the nasopalatine canal - LIANG, X.; Jacobs, Reinhilde; MARTENS, Wendy; Hu, YuQian; ADRIAENSENS, Peter; Quirynen, Marc; LAMBRICHTS, Ivo
P>Aim To determine the human anatomic variability of the nasopalatine canal and determine its characteristics using an anatomical, histological and computed tomography (CT) scan evaluation. Materials and Methods Measurements for the canal characteristics were carried out on 163 dry human skulls and 120 upper jaw spiral CT scans, taken from patients for pre-operative planning purposes of implant placement in the incisor region. Furthermore, four human cadaver specimens were imaged using a high-resolution magnetic resonance imaging (HR-MRI) unit. Afterwards, these specimens were serially sectioned for histological examination to evaluate the nasopalatine canal region and its content. Results The nasopalatine canal anatomy...
14.
Efficient formation, isolation and characterization of poly(3-alkylthiophene) nanofibres: probing order as a function of side-chain length - OOSTERBAAN, Wibren; VRINDTS, Veerle; RUTTENS, Bart; Berson, Solenn; Guillerez, Stephane; Douheret, Olivier.; D'HAEN, Jan; ADRIAENSENS, Peter; MANCA, Jean; LUTSEN, Laurence; VANDERZANDE, Dirk
Efficient fibre formation for all regioregular poly(3-alkylthiophene)s (P3ATs) with alkyl chain lengths (A) between 3 and 9 carbon atoms has been accomplished in several solvents. It was observed that for the aliphatic and (chlorinated) aromatic hydrocarbon solvents used, the solvent refractive index offers some rationale to predict the feasibility of a solvent for fibre formation. The fibres were separated from remaining non-organised polymer by centrifugation. This enabled the characterisation of the isolated fibres in function of alkyl chain length (A) with TEM, AFM, XRD and UV-Vis spectroscopy. The fibres are 20 ± 5 nm wide and 0.5 to >4 µm...
16.
Flash co-pyrolysis of biomass: The influence of biopolymers - CORNELISSEN, Tom; Jans, M.; STALS, Mark; KUPPENS, Tom; THEWYS, Theo; JANSSENS, Gerrit; Pastijn, H.; YPERMAN, Jan; REGGERS, Guy; SCHREURS, Sonja; CARLEER, Robert
A high water content is one of the major drawbacks for the utilisation of bio-oil. One technology which shows the potential to satisfy the demand for bio-oil with a reduced water content is the flash co-pyrolysis of biomass with biopolymers. The influence of biopolymers on the pyrolysis yield of a biomass waste stream is investigated with a semi-continuous home-built pyrolysis reactor. Polylactic acid (PLA), corn starch, polyhydroxybutyrate (PHB), Biopearls, Eastar, Solanyl and potato starch are the biopolymers under investigation. All biopolymers show their specific benefits during flash co-pyrolysis with willow (target biomass) at 723 K. Each (co-)pyrolysis of pure willow...
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