نتایج جستجو برای: oscillating reactions
تعداد نتایج: 177299 فیلتر نتایج به سال:
In this work we apply a generalized Zusman model to study the influence of an external periodic electric field on the dynamics of electron transfer ~ET! reactions coupled to an overdamped reaction coordinate which is treated semiclassically. Being nonperturbative in the tunneling coupling this approach goes beyond the conventional Golden Rule description and includes both adiabatic and nonadiab...
1T HE DUMBELL-DIFFUSION CELL described by Nobel (1) is made from a ball and socket joint, each end of which is formed into a bell-shaped flask. This cell is applicable to rapid testing of blood for the presence or absence of various toxic constituents. it allows diffusion, absorption, and i(lentiflcation reactions to proceed concurrently under a variety of conditions (Table 1). [sing this appar...
This work deals with the use of pruning ANNs in conjunction with genetic algorithms for resolving nonlinear multicomponent systems based on oscillating chemical reactions. The singular analytical response provides by this chemical system after its perturbation was tted to a gaussian curve by least-square regression and the estimates were used as inputs to the ANNs. The proposed methodology was ...
a novel acrylic acid-functionalized fe3o4 magnetic nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperacid in chemical transformations. the structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (tem), thermogravimetric analysis (tga), and ft-ir...
This paper deals with generalized approach to the reciprocating piston compressor driven by oscillating electrical motor and possibilities of development of new structures of the device. The current term linear compressor, ipso facto, restricts the considered devices only with a linear motion of the piston. Therefore the more general term oscillating motor-compressors is used in the paper, in w...
The biological effects of electromagnetic fields have seriously concerned the scientific community and the public as well in the past decades as more and more evidence has accumulated about the hazardous consequences of so-called "electromagnetic pollution." This theoretical model is based on the simple hypothesis that an oscillating external electric field will exert an oscillating force to ea...
We present an underapproximation for context-free languages by filtering out runs of the underlying pushdown automaton depending on how the stack height evolves over time. In particular, we assign to each run a number quantifying the oscillating behavior of the stack along the run. We study languages accepted by pushdown automata restricted to k-oscillating runs. We relate oscillation on pushdo...
The flow field and the motion of the free surface in an oscillating container are simulated numerically to assess the numerical approach for studying two-phase flows under oscillating conditions. Two numerical methods are compared: one is to model the oscillating container directly using the moving grid of the ALE method, and the other is to simulate the effect of container motion using the osc...
The objective of this study was to evaluate the effects of increasing dietary crude protein (CP) levels and also comparing the effects of static versus oscillating dietary CP on ruminal nutrient digestibility, ruminal fermentation, nitrogen (N) metabolism, and microbial efficiency in beef cattle diets using a dual-flow continuous culture system. Eight fermenters (1,223 ± 21 mL) were used in a r...
For oscillating time series, the prediction is often focused on the turning points. In order to predict the turning point magnitudes and times it is proposed to form the state space reconstruction only from the turning points and modify the local (nearest-neighbor) model accordingly. The model on turning points gives optimal predictions at a lower dimensional state space than the optimal local ...
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