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We describe a simple combinatorial approximation algorithm for finding a shortest (simple) cycle in an undirected graph. For an undirected graph G of unknown girth k, our algorithm returns with high probability a cycle of length at most 2k for even k and 2k + 2 for odd k, in time O(n(3/2) root logn). Thus, in general, it yields a 2 2/3 approximation. We study also the problem of finding a simple c
In this paper, problems related to simulation model documentation and model exchange between users are discussed. Complex simulation models have gained popularity in the environmental field, but require extensive documentation to allow independent implementation. The existence of different simulation platforms puts high demands on the quality of the original documentation. Recent experiences from
The computation of the Capon and the amplitude and phase estimation (APES) filters can be very time consuming. The burden lies not only in the inversion of the sample covariance matrix, but also in the matrix multiplications. In this paper, we propose an efficient algorithm for the computation of the above mentioned filters, using Cholesky factorization and fast Fourier transforms. Furthermore, we
Message passing schedules that reduce the decoding complexity of terminated LDPC convolutional code ensembles are analyzed. Considering the AWGN channel, various schedules are compared by means of density evolution. The results of the analysis together with computer simulations for some (3,6)-regular codes confirm that sliding window decoding is an attractive practical solution for low-latency and
Forward-only algorithms offer a promising memory-efficient alternative to Backpropagation (BP) for on-device training. However, state-of-the-art forward-only algorithms, e.g., Forward-Forward (FF), still require a substantial amount of memory during the training process, often exceeding the limits of mobile edge and Internet of Things (IoT) devices. At the same time, existing memory-optimization t
In this thesis we study efficient solvers for space-time discontinuous Galerkin spectral element methods (DG-SEM). These discretizations result in fully implicit schemes of variable order in both spatial and temporal directions. The popularity of space-time DG methods has increased in recent years and entropy stable space-time DG-SEM have been constructed for conservation laws, making them interes
ZnTe colloidal semiconductor nanocrystals (NCs) have shown promise for light-emitting diodes (LEDs) and displays, because they are free from toxic heavy metals (Cd). However, so far, their low photoluminescence (PL) efficiency (∼30%) has hindered their applications. Herein, we devised a novel structure of ZnTe NCs with the configuration of ZnSe (core)/ZnTe (spherical quantum well, SQW)/ZnSe (shell
As the demand for eco-friendly alternatives to traditional plastics grows, Polyethylene Furanoate (PEF) emerges as a promising solution. Derived from renewable biomass sources, PEF embodies sustainability principles by reducing reliance on finite resources and minimizing environmental impact. PEF is synthesized from 2,5-furandicarboxylic acid (FDCA), a key monomer which upon polymerization has the
Ambitions and ClarificationsThe book takes its point of departure in the "intimate visions of society" that are significant of contemporary social life. This concept refers to the tendency to apprehend good social relations as personal, close and warm, while bad relations correspondingly are perceived as impersonal, cold, distant and alienated. Exemplary categories, such as closeness, warmth, commAmbitions and ClarificationsThe book takes its point of departure in the "intimate visions of society" that are significant of contemporary social life. This concept refers to the tendency to apprehend good social relations as personal, close and warm, while bad relations correspondingly are perceived as impersonal, cold, distant and alienated. Exemplary categories, such as closeness, warmth, comm
The changing forms of governance stemming from the rise of New Public Management (NPM) and New Public Governance (NPG) have brought about significant changes in the relationship between the public and private sectors (Christensen and Lægreid 2007; Torfing and Triantafillou 2013). Not only have we witnessed a gradual increase in the involvement of private actors in the provision of public services,
livsmedel – Vetenskap och Hälsa Hoppa till innehåll Vetenskap och hälsa Populärvetenskapligt om medicinsk forskning i Skåne Teman Podd Tidskrift Prenumerera Om webbplatsen Kontakt Sök Sök Etikett: livsmedel Livsmedel – livets medel 2016-11-02 Yvonne Granfeldt installerades som professor i livsmedelsteknologi med inriktning mot nutrition den 14 oktober vid Lunds universitet. Nedan skriver hon själv
https://www.vetenskaphalsa.se/tag/livsmedel/ - 2026-07-24
Selective estrogen receptor beta (ER beta) agonists display neuroprotective properties in animal models and hold promise in the treatment of neurodegenerative diseases. In our quest to design, synthesize and evaluate potent and safe ER beta agonists, we focused on making an analogue of 16 beta,17 alpha-estriol (16,17-epiestriol), a potent and one of the most ER beta selective endogenous estrogens
The molecular conservation of a surface-exposed lipoprotein, protein D, of Haemophilus influenzae was studied by cloning and sequencing of the gene encoding protein D from three encapsulated type b strains and three nontypeable strains of H. influenzae. These nucleotide sequences were analyzed with previously reported sequences from one type b strain and one nontypeable strain. The nucleotide sequ
