2,066 research outputs found
« Les données événementielles » : origines et perspectives d’une méthode scientifique en relations internationales
EVALUATION OF THE ANTIOXIDANT ACTIVITY OF THE FLAVONOIDS ISOLATED FROM HELIOTROPIUM SINUATUM RESIN USING ORACFL, DPPH AND ESR METHODOLOGIES
Indexación: Web of Science; Scielo.The antioxidant capacity has been determined for a number of flavonoid compounds from Heliotropium sinuatum, a plant that grows in arid areas in the north of Chile. The methodologies used were: ORAC(FL) (oxygen radical absorbance capacity - fluorescein), DPPH (2,2-diphenyl-2-picrylhydrazyl) bleaching and electron spin resonance (ESR). These compounds were studied in homogeneous and heterogeneous media. The results showed that the 7-o-methyleriodictiol and 3-o-methylisorhamnetin are those with the highest antioxidant capacity.http://ref.scielo.org/m82cz
Online Makespan Minimization with Parallel Schedules
In online makespan minimization a sequence of jobs
has to be scheduled on identical parallel machines so as to minimize the
maximum completion time of any job. We investigate the problem with an
essentially new model of resource augmentation. Here, an online algorithm is
allowed to build several schedules in parallel while processing . At
the end of the scheduling process the best schedule is selected. This model can
be viewed as providing an online algorithm with extra space, which is invested
to maintain multiple solutions. The setting is of particular interest in
parallel processing environments where each processor can maintain a single or
a small set of solutions.
We develop a (4/3+\eps)-competitive algorithm, for any 0<\eps\leq 1, that
uses a number of 1/\eps^{O(\log (1/\eps))} schedules. We also give a
(1+\eps)-competitive algorithm, for any 0<\eps\leq 1, that builds a
polynomial number of (m/\eps)^{O(\log (1/\eps) / \eps)} schedules. This value
depends on but is independent of the input . The performance
guarantees are nearly best possible. We show that any algorithm that achieves a
competitiveness smaller than 4/3 must construct schedules. Our
algorithms make use of novel guessing schemes that (1) predict the optimum
makespan of a job sequence to within a factor of 1+\eps and (2)
guess the job processing times and their frequencies in . In (2) we
have to sparsify the universe of all guesses so as to reduce the number of
schedules to a constant.
The competitive ratios achieved using parallel schedules are considerably
smaller than those in the standard problem without resource augmentation
Exact FLRW cosmological solutions via invariants of the symmetry groups
Until now, various methods have been demonstrated to solve the
Friedmann-Lama\'{\i}tre-Robertson-Walker (FLRW) equations in the spatially flat
cosmological model. In this study, in order to solve the field
equations of the spatially flat FLRW cosmological model in the presence of
, a new method based on the invariants of the symmetry groups which we
called ISG-method, is presented. This method is based on the extended
Prelle-Singer (PS) method and it uses the Lie point symmetry,
-symmetry and Darboux polynomials (DPs). We employ this method to
extract systematically the two independent first integrals (or invariants) such
as and associated to the group of
the Lie point transformations keeping the Friedmann-Einstein dynamical equation
(DE), , invariant. The obtained solutions from
solving the DEs of the FLRW cosmological model by the ISG-method are explicitly
written, so that they are suitable for cosmological applications. Finally, as
an application of the solutions we look at the age of universe in the presence
of cosmological constant where the dominant matter of the universe is
considered to be fluid with the state parameter . In this regard, we
calculate the age of universe when the dominant matter is dust.Comment: 33 pages, 1 figure, 2 tables, submitted to journa
Pengaruh Harga dan Penataan Produk (Display)terhadap Keputusan Pembelian dengan Kepuasan Konsumen sebagai Variabel Intervening pada Ud. Rejeki Agung Lamongan
This research was conducted at UD. REJEKI AGUNG Lamongan is engaged in marketing children\u27s toys. The purpose of this study was to determine how the influence of displays on purchasing decisions with customer satisfaction as an intervening variable at UD. REJEKI AGUNG Lamongan. The purpose of this study was to determine how much influence the display (product arrangement) on purchasing decisions with consumer satisfaction as an intervening variable. The population in this study were all consumers who had purchased the product in 2017. While the sample was 98 respondents using the Convinience Sampling method, which is a sampling technique that is easy to find. The results of this study indicate that the price and display partially affect Consumer satisfaction and Purchasing Decisions. And simultaneously also shows that price and display influences consumer satisfaction and purchasing decisions. Price variables give a greater influence on customer satisfaction and purchasing decisions
A new chironomid (Insecta: Diptera) from Wealden amber (Lower Cretaceous) of the Isle of Wight (UK)
The first insect from the Wealden amber of the Isle of Wight (early Barremian) is formally described. Dungeyella gavini n. gen., n. sp. (Diptera: Chironomidae) is a tiny buchonomyiine/podonomian with specialised wing venation and probably lived in an araucarian riparian woodland with seasonal resin production. It is in one of the oldest-known ambers with insect inclusions
Extended Spectrum Beta-Lactamase Carriage State among Elderly Nursing Home Residents in Beirut
Introduction. ESBL-producing Enterobacteriaceae can cause severe infections, but they are also isolated from the stool of asymptomatic subjects. Faecal carriage of such organism is poorly understood. Methods. First phase of the study was cross-sectional with prevalence and epidemiology of ESBL faecal carriage in two nursing homes in Beirut: 57 residents in the first (NH1) and 151 residents in the second (NH2). In second phase, faecal swabs from cohort of NH1 residents were examined for carriage at six-week intervals over three-month period. Residents’ charts were reviewed to assess carriage risk factors. Results. Over 3 consecutive samplings at NH1, 81% of residents were at least one-time carriers with 50% at the first round, 60.4% at the second, and 74.5% at the last one. At NH2, 68.2% of residents were carriers. Constipation (in NH1) and antibiotic intake (in NH2) were significantly associated with higher ESBL faecal carriage while the length of stay at the nursing home (in NH2) was associated with less carriage. Conclusion. Faecal carriage of ESBL-producing Enterobacteriaceae is high among nursing home patients in Beirut. The rate of carriage changes rapidly and significantly over time either with multiple factors playing a possible role like outbreak spreading, antibiotic, and health care system exposure
- …