101,916 research outputs found
Correction: Semantic Evaluation of Nursing Assessment Scales Translations by ChatGPT 4.0: A Lexicometric Analysis (Nursing Reports, (2025), 15, 6, (211), 10.3390/nursrep15060211)
No full text: Elena Sblendorio was not included as an author in the original publication [...]
Parallel-in-time implementation of transient stability simulations on a transputer network
No full textThe most time consuming computer simulation in power system studies is the transient stability analysis. Parallel processing has been applied for time domain simulations of power system transient behavior. In this paper, a parallel implementation of an algorithm based on Shifted-Picard dynamic iterations is presented. The main idea is that a set of nonlinear Differential Algebraic Equations (DAEs), which describes the system, can be solved by the iterative solution of a linear set of DAEs. The time behavior of the linear set of differential equations can be obtained by the evaluation of the convolution integral. In the parallel-in-time implementation of the proposed algorithm, each processor is devoted to the evaluation of the complete set of variables relative to each time step. The quadrature formula, adopted for the integral evaluation, can be easily parallelized by using a number of processors equal to the number of time steps. The algorithm, implemented on a transputer network with 32 Inmos T800/20 adopting a uni-directional ring topology, has been tested on standard power system
Parallel algorithms for power system transient stability analysis: potentials & drawbacks
No full textSynthesis of A Sequential Stable Decentralized Controller for Flexible A.C. Long Distance Transmission Systems
No full textThe use of Static VAR Compensators (SVCs) in long distance transmission systenis is an effective means to damp voltage fluctuations and to improve the system stability,
both under small and large disturbances. Additional advantages can be obtained by adopting Thyristor Controlled Phase Sliiftcrs (TCPSs) able to regulate the active power flow,
to reduce the power arid frequency dcviations atid lo increase the transmission system capacity.
The control actions ol these compoments must be co-ordinated with a control strategy associated to synchronous In this paper, a systernatic procedure for
the co- ordinated design of decentralized controllers associated to the generating units and the TCPSs at the sending end, as well as to all the SVCs
distributed at intermediate substations of an A.C. long distance transmission system, has been developed. The proposed procedure is organized in two steps.
The sequential design of the controllers associated to the Pf and QV channels allows to drive oscillatory arid aperiodic modes in a selective way.
Additionally, sequential stability is assured at each step of the procedure. An example is presented to illustrate the validity and usefulness of the suggested approach
[Transrectal echography of the prostate in the long-term follow-up of prostatic carcinoma in advanced stage]. FT L'ecografia transrettale della prostata nel follow-up a lungo termine del carcinoma prostatico in stadio avanzato.
No full textL'ecografia transrettale nella valutazione degli effetti indotti dalla laser terapia endocavitaria in pazienti portatori di prostatite batterica
No full text104 patients with acute bacterial prostatitis were randomized to an antibiotic therapy group (group I) and an antibiotic plus laser therapy group (group II). Laser therapy was applied ever other day through a trans-rectally inserted fiberoptic probe. Resolution of the symptoms occurred in 87% of the patients in group I and 92% in group II (p < 0.001). Transrectal ultrasound resulted in resolution of the peri-prostatic venous plexus congestion in 43.7% of the patients in group I and 89.7% in group II. In conclusion, the combination of laser therapy and antibiotics in bacterial prostatitis provides both a better resolution of the symptoms and a reduction or disappearance of the peri-prostatic venous congestion
ANGIO-RM VERSUS AORTOGRAFIA NELLA VALUTAZIONE PREOPERATORIA DEL DONATORE NEL TRAPIANTO RENALE DA VIVENTE.
No full text[Transrectal echography of the prostate in the long-term follow-up of prostatic carcinoma in advanced stage].
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