The development of high-speed intelligent rail transit has increased the number of sensors applied on trains. These play an important role in train state control and monitoring. These sensors generally work in a severe environment, so the key problem for sensor data acquisition is to ensure data accuracy and reliability. In this paper, we follow the sequence of sensor signal flow, present senso...

"Vascular" artifacts can have substantial effects on human cerebral blood flow values calculated by using arterial spin tagging approaches. One vascular artifact arises from the contribution of "tagged" arterial water spins to the observed change in brain water MR signal. This artifact can be reduced if large bipolar gradients are used to "crush" the MR signal from moving arterial water spins. ...

Signal recognition particles (SRPs) in the cytosols of prokaryotes and eukaryotes are used to target proteins to cytoplasmic membranes and the endoplasmic reticulum, respectively. The mechanism of targeting relies on cotranslational SRP binding to hydrophobic signal sequences. An organellar SRP identified in chloroplasts (cpSRP) is unusual in that it functions posttranslationally to localize a ...

Early in their lives, planets endure extreme amounts of ionizing radiation from host stars. For with primordial hydrogen and helium-rich envelopes, this can lead to substantial mass loss. Direct observations atmospheric escape young planetary systems help elucidate critical stage evolution. In work, we search for metastable helium absorption---a tracer tenuous gas escaping atmospheres---during ...

This paper focuses on the optimization of bus signal priority with consideration stochastic traffic demand. Based a situation variability composition, phase clearance reliability (PCR) value each and composition ratio is introduced to reflect condition at intersection. Then, model proposed purpose maximum total vehicular departure as goal. In order obtain optimal solution, an improved algorithm...

2 Abstract A fast, two-coil pseudo-continuous labeling scheme is presented. The new scheme permits collection of a multi-slice subtraction pair in less than three seconds, depending on the subject's arterial transit times. The method consists of acquisition of both the control and tag images immediately after a labeling period that matches the arterial transit time. The theoretical basis of the...

In many service systems, customers are not served in the order they arrive, but according to a priority scheme that ranks them with respect to their relative “importance.” However, it may not be an easy task to determine the importance level of customers, especially when decisions need to be made under limited information. A typical example is from health care: When triage nurses classify patie...