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Characterization of landfilled stainless steel slags in view of metal recovery

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 353-362页

作者： Xuan Wang Daneel Geysen Tom van Gerven Peter T. Jones bart Blanpain Muxing Guo Department of Metallurgy and Materials Engineering KU Leuven 3001 Heverlee Belgium Department of Chemical Engineering KU Leuven 3001 Heverlee Belgium Department of Research and Development Group Machiels 3001 Heverlee Belgium

The slag samples taken from landfill, which originated from different metallurgical processes, have been characterized in this study. The slags were categor- ized as electric arc furnace （EAF） slag, argon oxygen decarburization/metal refining process slag and vacuum oxygen decarburization slag based on chromium content and basicity. EAF slags have higher potential in metal recovery than the other two slags due to its higher iron and chromium contents. The size of the iron-chromium-nickel alloy particles varies from a few ~tm up to several cm. The recoveries of large metal particles and metal-spinel aggregates have potential to make the metal recovery from landfilled slags economically viable.

关键词： landfilled stainless steel slag metal recovery characterization

Performance Comparison of Chemically Modified Sugarcane Bagasse for Removing Cd(II) in Water Environment

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Journal of Renewable Materials 2019年第5期7卷 415-428页

作者： Manh Khai Nguyen Minh Trang Hoang Thi Thuy Pham bart van der Bruggen Falculty of Environmental Science VNU University of Science334 Nguyen TraiHanoiVietnam Laboratory for Process Engineering for Sustainable Systems Department of Chemical EngineeringKU LeuvenBelgiumCelestijnenlaan 200F3001 LeuvenBelgium

This paper evaluates the adsorption capacity of chemically sugarcane bagasses with sodium hydroxide(SHS),citric acid(CAS),tartaric acid(TAS)and unmodified sugarcane bagasse(SB)for cadmium adsorption in water *** results prove adsorption capacity for Cd(II)increases after chemical modification and the adsorption fits perfectly with the Langmuir *** had the highest maximum adsorption capacity of 45.45 mg/g followed by TAS with 38.46 mg/g and SHS with 29.41 at optimum pH 5.0 and 120 minutes equilibrium time while 1 g SB removed 18.8 mg Cd(II)in the same *** kinetics study of the process followed a pseudo-secondorder rate expression,that indicated a strong interaction between the biosorbents and *** sugarcane bagasse and modified sugarcane bagasse were characterized by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)*** chemical modification was confirmed by the presence of carboxyl and esters groups created at 1,738 *** estimation of acid groups in modified materials shows the enhancement of this group after *** the other hand,desorption studies showed the high leaching of cadmium ion from the biosorbent leading to the efficient reutilization of materials.

关键词： Cadmium chemical modification citric acid sugarcane bagasse

Taking silicon photonics modulators to a higher performance level: state-of-the-art and a review of new technologies

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Advanced Photonics 2021年第2期3卷 38-60页

作者： Abdul Rahim Artur Hermans Benjamin Wohlfeil Despoina Petousi bart Kuyken Dries van Thourhout Roel Baets Ghent University Photonics Research GroupDepartment of Information TechnologyGhentBelgium Ghent University IMEC and Center for Nano-and BiophotonicsGhentBelgium ADVA Optical Networking BerlinGermany

Optical links are moving to higher and higher transmission speeds while shrinking to shorter and shorter ranges where optical links are envisaged even at the chip *** scaling in data speed and span of the optical links demands modulators to be concurrently performant and *** photonics(SiPh),a photonic integrated circuit technology that leverages the fabrication sophistication of complementary metal-oxide-semiconductor technology,is well-positioned to deliver the performance,price,and manufacturing volume for the high-speed modulators of future optical communication *** has relied on the plasma dispersion effect,either in injection,depletion,or accumulation mode,to demonstrate efficient high-speed *** high-speed plasma dispersion silicon modulators have been commercially deployed and have demonstrated excellent *** years have seen a paradigm shift where the integration of various electro-refractive and electro-absorptive materials has opened up additional routes toward performant SiPh *** modulators are in the early years of their *** promise to extend the performance beyond the limits set by the physical properties of *** focus of our study is to provide a comprehensive review of contemporary(i.e.,plasma dispersion modulators)and new modulator implementations that involve the integration of novel materials with SiPh.

关键词： high-speed modulators silicon photonics plasma dispersion effect ferroelectrics graphene III-V on Si organic(electro-optic)materials.

Numerical analysis of cavitation shedding flow around a three-dimensional hydrofoil using an improved filter-based model

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作者： bart van Es.

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Journal of Hydrodynamics 2017年第2期29卷 361-375页

作者：张德胜施卫东张光建陈健 B.P.M.(bart)van Esch Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China Department of Mechanical Engineering Eindhoven University of TechnologyEindhoven 5600MBTheNetherlands

The cavitation shedding flow around a 3-D Clark-Y hydrofoil is simulated by using an improved filter-based model （FBM） and a mass transfer cavitation model with the consideration of the maximum density ratio effect between the liquid and the vapor. The unsteady cloud cavity shedding features around the Clark-Y hydrofoil are accurately captured based on an improved FBM model and a suitable maximum density ratio. Numerical results show that the predicted cavitation patterns and evolutions compare well with the experimental visualizations, and the prediction errors of the time-averaged lift coefficient, drag coefficient and Strouhal number St for the cavitation number o- = 0.8, the angle of attack a= 8°at a Reynolds number Re = 7 x 10^5 are only 3.29%, 2.36% and 9.58%, respectively. It is observed that the cavitation shedding flow patterns are closely associated with the vortex structures identified by the Q- criterion method. The predicted cloud cavitation shedding flow shows clearly three typical stages：（1） Initiation of the attached sheet cavity, the growth toward the trailing edge. （2） The formation and development of the re-entrant jet flow. （3） Large scale cloud cavity sheds downstream. Numerical results also indicate that the non-uniform adverse pressure gradient is the main driving force of the re-entrant jet, which results in the U-shaped cavity and the 3-D bubbly structure during the cloud cavity shedding.

关键词： Cloud cavitation shedding flow filter-based model turbulent viscosity Clark-Y hydrofoil

Percutaneous resection of upper tract urothelial cell carcinoma:When,how,and is it safe?

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Asian Journal of Urology 2016年第3期3卷 134-141页

作者： Willem E.Strijbos bart van der Heij Department of Urology Zuyderland Medical CentreHeerlenThe Netherlands

Introduction:In the management of upper tract urothelial cell carcinoma(UTUC)endoscopic,nephron sparing procedures like ureterorenoscopy(URS)or percutaneous tumour resection(PCTR)still play a very limited *** could lead to possible unnecessary radical nephroureterectomies(RNU),still being the gold standard *** risk of chronic kidney disease(CKD)later in life is *** this study we present the results of 24-year experience with PCTR in a single ***:We identified 44 patients who underwent PCTR between 1992 and *** resection was achieved in 40 patients who were included in this *** and clinical data,including tumour recurrence,progression to RNU,tumour grade and overall survival(OS)were retrospectively *** outcome analysis was ***:Median age at diagnosis was 68 years(range 42-94 years).Low grade tumours were found in 37 patients(92.5%)and high grade tumours in three patients(7.5%).Median followup was 53 months during which 20 patients developed upper tract recurrences(50.0%).The longest time to recurrence was 97 *** follow-up 11 patients(27.5%)underwent an RNU and two patients died from *** could be avoided in 29 patients(72.5%).In this study we found that multifocality is a significant risk factor for recurrence,but not for stage progression to ***:PCTR is a surgically and oncologically safe *** preservation in patients with UTUC who are eligible for percutaneous resection can be achieved in the majority of *** criteria for PCTR should be further refined,leading to a wider application of PCTR in the ***-up needs invasive procedures and should be long term.

关键词： Percutaneous tumour resection PCTR UTUC Endoscopic management Upper tract urothelial cell carcinoma Tumour surface area

Improvement of the SST γ-Re_(θt) transition model for flows along a curved hydrofoil

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Journal of Hydrodynamics 2021年第3期33卷 520-533页

作者： Chang-liang Ye Chao-yue Wang Dan Zi Yuan Tang bart.P.M.van Esch Fu-jun Wan College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Department of Mechanical Engineering Eindhoven University of TechnologyEindhovenThe Netherlands Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System Beijing100083China

The transition in the boundary-layer flow affects the hydrodynamic performances of hydraulic machineries,as the key components in the ship propulsion *** shear stress transfer(SST)γ-Re_(θt) transition model is an important prediction tool in the boundary layer simulation for *** present paper improves the prediction accuracy of the SST γ-Re_(θt) model for the boundary layers along a curved *** SST γ-Re_(θt) transition model for the flows along a curved hydrofoil is improved by introducing a correction to the transition onset Reynolds number Reθ***,the transition onset locations for the flows along the hydrofoils of different curvatures are obtained by the large eddy simulation and by using the SST γ-Re_(θt) ***,the transition onset Reynolds numbers Reθt in the SST γ-Re_(θt) model is modified to ensure that the predicted boundary layer parameters are consistent with the large eddy simulation(LES)*** correlation function between the curvature ratio and the modified transition onset Reynolds number is obtained and subsequently used as a correction function in the original SST γ-Re_(θt) *** test cases are used to evaluate the performance of the improved SST γ-Re_(θt) *** the NACA0035 hydrofoil with a large curvature,the predicted results obtained by using the improved SST γ-Re_(θt) model are quite consistent with the experimental data,which indicates the advantages of the improved model in predicting the boundary layer transition along a *** the test cases of the NACA0016 hydrofoil with a mild curvature and the NACA66(mod)-312 hydrofoil,the prediction results of the improved model are in good agreement with the experimental results in terms of the wake region and the boundary layer parameters,which indicates that the improved SST γ-Re_(θt) model can serve as a powerful tool in the design and the optimization of hydraulic machineries such as the waterjet pumps or the naval propellers.

关键词： Hydrodynamics transition model curvature effect hydrofoil boundary layer transition

Oral polymorphonuclear neutrophil characteristics in relation to oral health： a cross-sectional, observational clinical study

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International Journal of Oral Science 2016年第3期8卷 191-198页

作者： Patrick Rijkschroeff Ineke DC Jansen Fridus A van der Weijden bart IF Keijser Bruno G Loos Elena A Nicu Department of Periodontology Academic Centre for Dentistry Amsterdam Amsterdam The Netherlands Department of Preventive Dentistry Academic Centre for Dentistry Amsterdam Amsterdam The Netherlands Microbiology and Systems Biology TNO Earth Environmental and Life Sciences Zeist The Netherlands Top Institute Food and Nutrition Wageningen The Netherlands

Polymorphonuclear neutmphils （PMNs） have a major role in the innate immune system. However, little is known about PMN contribution in relation to oral health. The objective of this study was to investigate the numbers and functional characteristics of oral PMNs （oPMNs） compared with circulatory PMNs （cPMNs）. Oral rinse and venous blood samples were obtained from 268 systemically and orally healthy volunteers in a cross-sectional observational study. PMN counts, cell cycle analysis and cellular activation state were investigated. Also, reactive oxygen species （ROS） production was analyzed, with and without bacterial stimulation （Fusobacterium nucleatum）. In males, 1.2 × 10^6- 1.0 ×10^6 oPMNs were collected, and showed a tendency to correlate with the levels of gingival bleeding （r= 0.215, P= 0.008）. Comparable oPMNs counts were found among females （1.0 ×10^6＋ 0.7 × 10^6）. More late-stage apoptotic/necrotic cells were found among the oPMNs （53.1%） compared with the cPMNs （8.5%; P〈 0.001）. Without additional stimulation, oPMNs were more activated than cPMNs, as indicated by higher expression of CD11b, CD63 and CD66b, and higher constitutive ROS levels （P〈 0.001）. Notably, in response to bacterial stimulation, oPMNs released comparable ROS levels as cPMNs （P= 0.042）. In conclusion, this study provides data on viable oPMNs showing high levels of activation in orally and systemically healthy individuals, free of apparent caries lesions and periodontal disease. These data suggests that although the oPMNs are in a more mature stage of their life cycle compared with the cPMNs, oPMNs are still responsive to stimulation, which indicates their functional potential and possible contribution to a healthy oral ecosystem.

关键词： apoptosis degranulation neutrophils oral health reactive oxygen species

Numerical analysis of the unsteady behavior of cloud cavitation around a hydrofoil based on an improved filter-based model

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Journal of Hydrodynamics 2015年第5期27卷 795-808页

作者：张德胜王海宇施卫东张光建 van ESCH B.P.M.(bart) Research Center of Fluid Machinery Engineering and Technology Jiangsu University Department of Mechanical Engineering Eindhoven University of Technology

The unsteady cavitation evolution around the Clark-Y hydrofoil is investigated in this paper, by using an improved filter-base model（FBM） with the density correction method（DCM）. To improve the prediction accuracy, the filter scale is adjusted based on the grid size. The numerical results show that a small filter scale is crucial for the unsteady simulations of the cavity shedding flow. The hybrid method that combines the FBM and the DCM could help to limit the overprediction of the turbulent viscosity in the cavitation region on the wall of the hydrofoil and in the wake. The large value of the maximum density ratio ρ1 /ρv, clip promotes the mass transfer rate between the liquid phase and the vapor phase, which results in a large sheet cavity length and the vapor fraction rise inside the cavity. The cavity patterns predicted by the improved method are verified by the experimental visualizations. The time-average lift, the drag coefficient and the primary oscillating frequency St for the cavitation number σ= 0.8, the angle of attack, α= 8°, at a Reynolds number Re= 7×10^5 are 0.735, 0.115 and 0.183, respectively, and the predicted errors are 3.29%, 3.36% and 8.93%. The typical three stages in one revolution are well-captured, including the initiation of the sheet/attached cavity, the growth toward the trailing edge（TE） with the development of the re-entrant jet flow, and the large scale cloud cavity shedding. It is observed that the cloud cavity shedding flow induces the vortex pairs of the TE vortices in the wake and the shedding vortices. The positive vorticity vortex of the re-entrant jet and the TE vortices interacts and merges with the negative vorticity vortex of the leading edge（LE） cavity to produce the shedding flow.

关键词： filter-based model(FBM) density correction method cloud cavitation hydrofoil unsteady behavior