Phase equilibria in the Fe-Nb-Zr ternary system at 1,200 °C

Phase equilibria in the Fe-Nb-Zr system at 1,200 ℃ were determined by X-ray diffraction （XRD） and scanning electron microscope （SEM） coupled with energydispersive X-ray spectroscopy （EDS） techniques. Extensive NbFez domain was proposed in the current work. This compound existed in the composition range from 35 at% to 73 at% Fe, 12 at% to 32 at% Nb, and 0 to 32 at% Zr. In the present work, four three-phase regions （1）-（Nb,Zr） ＋ NbFe ＋ NbFe2, （2） [3-（Nb,Zr） ＋ NbFe2 ＋ Liquid, （3） NbFe2 ＋ Liquid ＋ ZrFe2, and （4） ZrFe2 ＋ Fe ＋ NbFe2, were established.

A ROS-Sensitive Diselenide-Crosslinked Polymeric Nanogel for NIR Controlled Release

Here we report a novel polymeric nanogel with stable loading cargo and near-infrared(NIR) controlled release properties.The nanogels are crosslinked by quaternization reactions of biocompatible poly(β-amino esters) and diselenide-bonded crosslinker(DSe DCl) in microemulsions.The hydrophobic cavities of the nanogels have the property of stably encapsulating the hydrophobic guest molecules,resulted from the crosslinked network structure.Due to the redox responsiveness of the diselenide bonds on the DSe DCl crosslinker,the nanogels can respond to oxidant H_(2)O_(2) causing the disintegration of the crosslinked network structure,thus the encapsulated guest cargo molecules will be released.It is noted that,upon loading the photosensitizer IR780,the nanogels can generate reactive oxygen species(ROS) under NIR irradiation to release the cargo.The advantages of encapsulated cargo stability enhanced by chemical cross-linking and remote stimulation response performance via NIR offer great potential of nanogels for applications of cargo controlled release.

EEG dynamics reflects the partial and holistic effects in mental imagery generation

Mental imagery generation is essential in the retrieval and storage of knowledge.Previous studies have indicated that the holistic properties of mental imagery generation can be evaluated more easily than the partial properties.However,the relationship between partial and holistic mental imagery generations has not been clearly demonstrated.To address this issue,we designed a task to investigate the changes in the spectrum of the electroencephalogram (EEG) during partial or holistic imagery generation.EEG signals were obtained from 18 healthy subjects,and a statistical measure of spectral dynamics between two EEG signals in per frequency band was performed.Additionally,a bicoherence spectrum analysis was used to detect the phase coupling within these two imagery conditions.Our results indicated that EEG of the partial imagery appeared earlier and stronger than that of the holistic imagery in the theta (5–8 Hz) range in a time window around 220 to 300 ms after cue onset,and a slight decrease in the alpha (8–12 Hz) band was observed at around 270 ms.The scalp topography of these changes in the theta and alpha bands distributed overall significantly in the frontal and central-temporal areas.The significant phase coupling within two conditions was remarkable at high frequency.From these results,we infer that there are complex relations between partial and holistic imageries.The generation of partial mental imagery is not a subprocess of holistic imagery,but it is relevant to holistic imagery and requires correct modification from the holistic information.