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- N Neubauer, R W März
- Phytomedicine : international journal of…
- 1994

On the basis of therapy with antibiotics and nasal decongestants the efficacy of an additional treatment with the herbal combination Sinupret containing gentian root, cowslip flowers, sour dock herbs, elder flowers and shop vervain wort herbs was assessed in a randomized, placebo-controlled double-blind clinical trial involving 160 patients with acute… (More)

We examine in this paper so-called B-critical points of linear, time-varying differentialalgebraic equations (DAEs) of the form A(t)(D(t)x(t))′ + B(t)x(t) = q(t). These critical or singular points, which cannot be handled by classical projector methods, require adapting a recently introduced framework based on Π-projectors. Via a continuation of certain… (More)

- Ricardo Riaza, Roswitha März
- Appl. Math. Lett.
- 2008

- Roswitha März, Antonio R. Rodríguez-Santiesteban
- Math. Comput.
- 2002

When integrating regular ordinary differential equations numerically, one tries to match carefully the dynamics of the numerical algorithm with the dynamical behaviour of the true solution. The present paper deals with linear index-2 differential-algebraic systems. It is shown how knowledge pertaining to (numerical) regular ordinary differential equations… (More)

- M Schmolz, D Ottendorfer, R W März, C Sieder
- International immunopharmacology
- 2001

It was investigated whether the botanical drug combination Sinupret is able to modulate the resistance of mice to a respiratory tract infection with Sendai virus (Parainfluenza viridae) if given prophylactically to the animals. Three doses of Sinupret drops (SD) and Sinupret tablets (ST, p.o.), and two active controls, the chemical secretolytic ambroxol… (More)

- Galina A. Kurina, Roswitha März
- SIAM J. Control and Optimization
- 2004

- Jingzhi Li, Jens Markus Melenk, +14 authors Harald Woracek
- 2009

Higher order finite element methods are applied to 2D and 3D second order elliptic interface problems with smooth interfaces, and their convergence is analyzed in the H1and L2-norm. The error estimates are expressed explicitly in terms of the approximation order p and a parameter δ that quantifies the mismatch between the smooth interface and the finite… (More)

- Galina A. Kurina, Roswitha März
- SIAM J. Control and Optimization
- 2007

An optimal feedback control has been obtained for linear-quadratic optimal control problems with constraints described by differential-algebraic equations. For that purpose, a new implicit Riccati equation (Riccati differential algebraic system) is provided, and its solvability is investigated. It is shown that one can do without those strong consistency… (More)

- Roswitha März, Caren Tischendorf
- SIAM J. Scientific Computing
- 1997

In electric circuit simulation the charge oriented modi ed nodal analysis may lead to highly nonlinear DAEs with low smoothness properties. They may have index 2 but they do not belong to the class of Hessenberg form systems that are well understood. In the present paper, on the background of a detailed analysis of the resulting structure, it is shown that… (More)