نتایج جستجو برای: taking
تعداد نتایج: 178939 فیلتر نتایج به سال:
The evolution of Earth's climate on geological timescales is largely driven by variations in the magnitude of total solar irradiance (TSI) and changes in the greenhouse gas content of the atmosphere. Here we show that the slow ∼50 Wm-2 increase in TSI over the last ∼420 million years (an increase of ∼9 Wm-2 of radiative forcing) was almost completely negated by a long-term decline in atmospheri...
We report numerical observation of two new forms of stable localized solutions of the quintic complex Ginzburg-Landau equation. The 6rst form is a stationary zero-velocity solution, which consists of two motionless fronts and a source between them. We call this structure the "composite" pulse. We show that in some range of parameters, a composite pulse can coexist with a plain pulse solution. A...
A growing number of X-ray sources based on the free-electron laser (XFEL) principle are presently under construction or have recently started operation. The intense, ultrashort pulses of these sources will enable new insights in many different fields of science. A key problem is to provide x-ray optical elements capable of collecting the largest possible fraction of the radiation and to focus i...
Controlling spatiotemporal chaos in excitable media by applying low-amplitude perturbations locally is of immediate applicability, e.g., in treating ventricular fibrillation, a fatal disturbance in the normal rhythmic functioning of the heart. We look at a mechanism of control by the local application of a series of biphasic pulses, i.e., involving both positive and negative stimulation. This r...
The dual systems model posits that adolescent risk-taking results from an imbalance between a cognitive control system and an incentive processing system. Researchers interested in understanding the development of adolescent risk-taking use a diverse array of behavioral and self-report measures to index cognitive control and incentive processing. It is currently unclear whether different measur...
OBJECTIVE In the present study, we investigated the attitude of psychiatrists who graduated in 2002-2009 towards Objective Structured Clinical Examination (OSCE) and conventional clinical interview examination (Individual Patient Assessment). METHOD We studied 134 psychiatrists graduated; half of whom were examined with conventional clinical interview and the others with OSCE. A questionnaire...
Ionization is the dominant response of atoms and molecules to intense laser fields and is at the basis of several important techniques, such as the generation of attosecond pulses that allow the measurement of electron motion in real time. We present experiments in which metastable xenon atoms were ionized with intense 7-micrometer laser pulses from a free-electron laser. Holographic structures...
We report on the remote characterization and dispersion compensation (pulse compression) of femtosecond pluses using multiphoton intrapulse interference phase scan (MIIPS). The results presented here were carried out at a distance of 28.9 m from the target. The method could be used with targets placed kilometers away. The amplified pulses arrive at the remote target within one percent of transf...
Valuable monetary rewards can boost human performance on various effortful tasks even when the value of the rewards is presented too briefly to allow for strategic decision making. However, the mechanism by which briefly-presented reward information influences performance has remained unclear. One possibility is that performance after briefly-presented reward information is primarily boosted vi...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید