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- C Hadjur, G Wagnières, F Ihringer, P Monnier, H van den Bergh
- Journal of photochemistry and photobiology. B…
- 1997

Zinc(II) phthalocyanine (ZnPC) is a new photosensitizer currently undergoing phase I and II clinical trials at Lausanne's CHUV hospital for the photodynamic therapy (PDT) of early cancer in the upper aerodigestive tract. Activated oxygen species other than singlet oxygen produced during the photosensitization of ZnPC in liposomes have been examined by… (More)

- Ferdinand Ihringer, Klaus Metsch
- Des. Codes Cryptography
- 2014

Erdős-Ko-Rado sets in finite classical polar spaces are sets of generators that intersect pairwise non-trivially. We improve the known upper bound for Erdős-Ko-Rado sets in H(2d + 1, q) for d > 2 and d even from approximately q +d to q 2+1.

We prove a conjecture by Van Dam & Sotirov on the smallest eigenvalue of (distance-j) Hamming graphs and a conjecture by Karloff on the smallest eigenvalue of (distance-j) Johnson graphs. More generally, we study the smallest eigenvalue and the second largest eigenvalue in absolute value of the graphs of the relations of classical P and Q-polynomial… (More)

- Ferdinand Ihringer
- Electr. J. Comb.
- 2015

A cross-intersecting Erdős-Ko-Rado set of generators of a finite classical polar space is a pair (Y,Z) of sets of generators such that all y ∈ Y and z ∈ Z intersect in at least a point. We provide upper bounds on |Y | · |Z| and classify the crossintersecting Erdős-Ko-Rado sets of maximum size with respect to |Y | · |Z| for all polar spaces except some… (More)

- Ferdinand Ihringer, Peter Sin, Qing Xiang
- J. Comb. Theory, Ser. A
- 2018

Two results are obtained that give upper bounds on partial spreads and partial ovoids respectively. The first result is that the size of a partial spread of the Hermitian polar space H(3, q) is at most ( 2p+p 3 )t +1, where q = p, p is a prime. For fixed p this bound is in o(q), which is asymptotically better than the previous best known bound of (q + q +… (More)

- Ferdinand Ihringer
- Eur. J. Comb.
- 2016

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