Reliability characteristics and conduction mechanisms in resistive switching memory devices using ZnO thin films

In this work, bipolar resistive switching characteristics were demonstrated in the Pt/ZnO/Pt structure. Reliability tests show that ac cycling endurance level above 106 can be achieved. However, significant window closure takes place after about 102 dc cycles. Data retention characteristic exhibits no observed degradation after 168 h. Read durability shows stable resistance states after 106 read times. The current transportation in ZnO films is dominated by the hopping conduction and the ohmic conduction in high-resistance and low-resistance states, respectively. Therefore, the electrical parameters of trap energy level, trap spacing, Fermi level, electron mobility, and effective density of states in conduction band in ZnO were identified

Tractography dissection variability: What happens when 42 groups dissect 14 white matter bundles on the same dataset?

White matter bundle segmentation using diffusion MRI fiber tractography has become the method of choice to identify white matter fiber pathways in vivo in human brains. However, like other analyses of complex data, there is considerable variability in segmentation protocols and techniques. This can result in different reconstructions of the same intended white matter pathways, which directly affects tractography results, quantification, and interpretation. In this study, we aim to evaluate and quantify the variability that arises from different protocols for bundle segmentation. Through an open call to users of fiber tractography, including anatomists, clinicians, and algorithm developers, 42 independent teams were given processed sets of human whole-brain streamlines and asked to segment 14 white matter fascicles on six subjects. In total, we received 57 different bundle segmentation protocols, which enabled detailed volume-based and streamline-based analyses of agreement and disagreement among protocols for each fiber pathway. Results show that even when given the exact same sets of underlying streamlines, the variability across protocols for bundle segmentation is greater than all other sources of variability in the virtual dissection process, including variability within protocols and variability across subjects. In order to foster the use of tractography bundle dissection in routine clinical settings, and as a fundamental analytical tool, future endeavors must aim to resolve and reduce this heterogeneity. Although external validation is needed to verify the anatomical accuracy of bundle dissections, reducing heterogeneity is a step towards reproducible research and may be achieved through the use of standard nomenclature and definitions of white matter bundles and well-chosen constraints and decisions in the dissection process

Isolation and cloning of a Drosophila homolog to the mammalian RACK1 gene, implicated in PKC-mediated signalling

AbstractThe mammalian RACK1 protein binds activated protein kinase C, acting as an intracellular receptor to anchor the activated PKC to the cytoskeleton. Genes encoding RACK1-like proteins have been isolated from a wide range of eucaryotic organisms; we report the isolation of a Drosophila member of this family. This Drosophila RACK1-like protein shows 76% identity to the mammalian RACK1 proteins, but only about 60% identity to related proteins from plants and fungi. The Drosophila rack1 gene has a dynamic pattern of expression during early embryogenesis with the highest expression in the mesodermal and endodermal lineages

Neighbourhood green space, perceived stress and sleep quality in an urban population

202210 bcchOthersThe Faculty of Health and Social Science Dean’s Reserve Fund from the Hong Kong Polytechnic Universit

Influence of urban green space and facility accessibility on exercise and healthy diet in Hong Kong

201907 bcrcVersion of RecordPublishe

The impact of the environment on the quality of life and the mediating effects of sleep and stress

202101 bcrcVersion of RecordOthersP0001215Publishe

Effects of urban green space on cardiovascular and respiratory biomarkers in chinese adults : panel study using digital tracking devices

202208 bcrcVersion of RecordOthersThe Hong Kong Polytechnic UniversityPublishe