Search

Your search keyword '"Van de Ven T"' showing total 187 results
Start Over Author "Van de Ven T"
187 results on '"Van de Ven T"'

16. Energy distribution functions for ions from pulsed EUV-induced plasmas in low pressure N2-diluted H2 gas.

Author

Beckers, J., van de Ven, T. H. M., de Meijere, C. A., van der Horst, R. M., van Kampen, M., and Banine, V. Y.

Subjects
*SPECTRAL energy distribution, *LITHOGRAPHY, *HIGH-density plasmas, *PHOTOIONIZATION, *MOLECULAR gas lasers
Abstract

The operation of Extreme Ultraviolet (EUV) lithography scanners inherently goes hand-in-hand with the creation of highly transient pulsed plasmas in the optical path of these tools. These so-called EUV-induced plasmas are created upon photoionization events when a pulsed beam of EUV photons travels through the low pressure background gas. It is fully recognized by the lithography industry that EUV-induced plasmas may significantly impact the quality and life-time of expensive and delicate optical elements in the scanner. Research efforts into EUV-induced plasmas impacting plasma-facing surfaces have so far been limited to pure hydrogen (H2) plasmas. However, this hydrogen background gas may occasionally be diluted with a small fraction of another molecular gas such as nitrogen (N2). The impact on the relevant plasma parameters of such molecular contaminants has remained unknown until now. In this letter, we put forward measurements of energy-resolved fluxes of (positive) hydrogen ions, nitrogen ions, and hydrogen-nitrogen ions created in a pulsed N2-diluted EUV-induced plasma in H2 at approximately 5 Pa (typical EUV lithography scanner conditions). The data have been obtained using an electrostatic quadrupole plasma analyzer and show that although the N2-dilution fraction is small (∼2 × 10−3) compared to the H2 partial pressure, implications for the ion flux out of the plasma and the composition thereof are significant. Since the mass of nitrogen-containing ions is much higher in comparison to that of their hydrogen counterparts, and because of their potential chemical activity, this effect has to be taken into account while studying the surface impact of EUV-induced plasmas. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

25. Werken aan de Wielewaalstraat: Transformation and activation of the organic urbanism on Rotterdam South

Author

Van de Ven, T. (author) and Van de Ven, T. (author)

Abstract

The principles of organic urbanism, originally applied by J.H. van den Broek in his plans on Rotterdam South, prove to be characteristic locations to propose strategic interventions for municipality and housing corporations to improve neighbourhoods and city districts. In this graduation report, an extensive historical research towards Rotterdam South, J.H. van den Broek and W.G. Witteveen offers the basis for a design intervention on the meeting points of girdle-roads (gordelwegen) and the transverse sides of opened building blocks., RMIT - Transforming Housing Heritage, Architecture, Architecture and The Built Environment

Published
2014

26. Experimentally revised repertoire of putative contingency loci in Neisseria meningitidis strain MC58: evidence for a novel mechanism of phase variation

Author

Martin, P, van de Ven, T, Mouchel, N, Jeffries, A, Hood, D, and Moxon, E

Abstract

Analysis of the genome sequence of Neisseria meningitidis strain MC58 revealed 65 genes associated with simple sequence repeats. Experimental evidence of phase variation exists for only 14 of these 65 putatively phase variable genes. We investigated the phase variable potential of the remaining 51 genes. The repeat tract associated with 20 of these 51 genes was sequenced in 26 genetically distinct strains. This analysis provided circumstantial evidence for or against the phase variability of the candidate genes, based on the sequence and the length of the repeated motif. These predictions of phase variability were substantiated for three of these candidate genes using colony immunoblotting or beta-galactosidase as a reporter. This investigation identified a novel phase variable gene (NMB1994 or nadA) associated with a repeat tract (TAAA) not previously reported to be associated with phase variable genes in N. meningitidis. Analysis of the nadA transcript revealed that the repeat tract was located upstream of the putative -35 element of the nadA promoter. Semiquantitative RT-PCR showed that variation in the number of repeats was associated with changes in the level of expression of nadA, findings consistent with a model whereby the variable number of (TAAA) repeats modulates the promoter strength.

Published
2003

27. Corrigenda

Author

ER Moxon, Van de Ven T, and CD Bayliss

Subjects
General Immunology and Microbiology, General Neuroscience, medicine, Biology, medicine.disease_cause, Molecular Biology, Virology, Corrigenda, General Biochemistry, Genetics and Molecular Biology, Tetranucleotide Repeats, Haemophilus influenzae
Published
2002

Catalog

Books, media, physical & digital resources
See catalog results