Norwegian University of Science and Technology

About: Norwegian University of Science and Technology is a education organization based out in Trondheim, Norway. It is known for research contribution in the topics: Population & Computer science. The organization has 23182 authors who have published 68917 publications receiving 1929313 citations. The organization is also known as: NTNU & Norwegian University of Science and Technology (NTNU).

Small-Signal Stability Analysis of Multi-Terminal VSC-Based DC Transmission Systems

Abstract: A model suitable for small-signal stability analysis and control design of multi-terminal dc networks is presented. A generic test network that combines conventional synchronous and offshore wind generation connected to shore via a dc network is used to illustrate the design of enhanced voltage source converter (VSC) controllers. The impact of VSC control parameters on network stability is discussed and the overall network dynamic performance assessed in the event of small and large perturbations. Time-domain simulations conducted in Matlab/Simulink are used to validate the operational limits of the VSC controllers obtained from the small-signal stability analysis.

HLA class I and II typing using cells positively selected from blood by immunomagnetic isolation--a fast and reliable technique.

Abstract: This paper describes a new cell isolation and HLA typing technique, which permits cell separation and HLA class I or class II typing to be performed in 70 min. Magnetic monodisperse microspheres (Dynabeads TM) were coated with monoclonal antibodies (MAbs) specific for the CD8 T cell antigen or for HLA class II monomorphic epitopes. They could then be used to obtain HLA class I or class II positive cells directly from ACD blood in approximately 15 min by the use of magnetic separation. The cells (attached to the microspheres) were subsequently used in microcytotoxic HLA typing (total incubation time of 55 min) using acridin orange/ethidiumbromide to stain viable (yellow) and dead (red) cells. It was found that this immunomagnetic (IM) HLA typing technique was specific, has a sensitivity superior to that observed for conventional microcytotoxicity assays and gave low background staining. IM HLA-ABC typing of 50 healthy donors and 10 patients and IM HLA-DR typing of 25 healthy donors and 30 patients gave results corresponding well with that obtained independently by conventional HLA typing (concordancy rates 92-100%). Furthermore, the IM HLA typing technique permitted reliable HLA class II typing of blood cells from six patients where conventional HLA class II typing was impossible. The IM HLA typing technique also enables HLA class I and II typing to be quickly and reliably performed on cells from ACD blood of cadaveric donors.

On the solution of linear differential equations in lie groups

Abstract: The subject matter of this paper is the solution of the linear differential equation y a(t)y, y(0) y0, where y0 G, a(.): R g and g is a Lie algebra of the Lie group G. By building upon an earlier w...