31 research outputs found
Building 3D Structures of Vanadium Pentoxide Nanosheets and Application as Electrodes in Supercapacitors
Clinical implications of genome-wide DNA methylation studies in acute myeloid leukemia
Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides
The determination of changes in hydrogeological properties (e.g., permeability and specific storage) of aquifers disturbed by mining activity is significant to groundwater resource and ecological environment protection in coal mine areas. However, such parameters are difficult to continuously measure in situ using conventional hydrogeological methods, and their temporal changes associated with coal mining are not well understood. The response of well water level to Earth tides provides a unique probe to determine the in situ hydrogeological parameters and their variations. In this study, the tidal responses of well water level were employed to characterize the changes in hydrogeological parameters of the overburden aquifer induced by longwall mining in a coalfield, northwest China. Based on the long-term hourly recorded water level data, two analytical models were used to determine the temporal changes of permeability and specific storage of the overburden aquifer. The results showed that the hydrogeological parameters changed with the longwall coal face advance. When the longwall coal face approached the wells, the aquifer permeability increased several to dozens of times, and the response distance ranged from 80 m to 300 m. The specific storage decreased before the coal face reached wells and recovered after the coal face passed. The results of this study indicate that the hydrogeological parameter changes induced by coal mining are related to the location of the well relative to the coal face and the stress distribution in the overburden aquifer. This study revealed the changes in permeability and specific storage associated with the mining disturbance which could have great significance for quantitative assessment of the impact of mining on overburden aquifer
Basic measurements of radiation at station Boulder, SURFRAD (2016-03)
How
to efficiently design and synthesize multifunctional molecules
is particularly challenging. In this presentation, we devote to constructing
a kind of simple structures with composite functionalities through
straightforward preparation. Starting from common commercially available
materials, the titled <i>cis</i>/<i>trans-</i>tetraarylethenes can be conveniently obtained by a one-pot process
under mild conditions. The different configurations were confirmed
by <sup>1</sup>H NMR and single crystal data analysis. The <i>trans-</i>tetraarylethenes could be converted into <i>cis</i>-forms not only by photoirradiation but also by microwave irradiation,
which provided us a new choice for isomeric conversion, especially
in relation to light sensitivity. Results show that all the hybrid <i>cis</i>/<i>trans</i>-isomers performed switchable
fluorescence and reversible photochromism in solution, PMMA film,
solid powder, and single crystal. Moreover, these hybrid tetraarylethenes
could be utilized as photoswitchable media to tune the behavior of
aggregation-induced emission (AIE) and aggregation-caused quenching
(ACQ). These versatile properties are favorable for the potential
applications in fluorescent photoswitches, nondestructive readout,
and logic gates. We hope that our design strategy could provide a
new protocol for constructing a kind of multifunctional molecules
based some simple structure and convenient synthetic procedures
Hybrid <i>cis</i>/<i>trans</i> Tetra-arylethenes with Switchable Aggregation-Induced Emission (AIE) and Reversible Photochromism in the Solution, PMMA Film, Solid Powder, and Single Crystal
How
to efficiently design and synthesize multifunctional molecules
is particularly challenging. In this presentation, we devote to constructing
a kind of simple structures with composite functionalities through
straightforward preparation. Starting from common commercially available
materials, the titled <i>cis</i>/<i>trans-</i>tetraarylethenes can be conveniently obtained by a one-pot process
under mild conditions. The different configurations were confirmed
by <sup>1</sup>H NMR and single crystal data analysis. The <i>trans-</i>tetraarylethenes could be converted into <i>cis</i>-forms not only by photoirradiation but also by microwave irradiation,
which provided us a new choice for isomeric conversion, especially
in relation to light sensitivity. Results show that all the hybrid <i>cis</i>/<i>trans</i>-isomers performed switchable
fluorescence and reversible photochromism in solution, PMMA film,
solid powder, and single crystal. Moreover, these hybrid tetraarylethenes
could be utilized as photoswitchable media to tune the behavior of
aggregation-induced emission (AIE) and aggregation-caused quenching
(ACQ). These versatile properties are favorable for the potential
applications in fluorescent photoswitches, nondestructive readout,
and logic gates. We hope that our design strategy could provide a
new protocol for constructing a kind of multifunctional molecules
based some simple structure and convenient synthetic procedures
Tumorigenicity and prediction of clinical prognosis of patient‐derived gastric cancer organoids
Reliability and validity of Handwriting Test for Preschool Children (HT-PRE): A new tool to assess the handwriting ability of preschool children aged 5-6 years old in Mainland China.
BACKGROUND:Handwriting ability is related to many neuronal functions, such as visual-perceptual skills, orthographic coding, motor planning and execution, kinesthetic feedback and visual-motor coordination. To date, there is no specific assessment tool for to assess preschool children's handwriting ability in Mainland China. Our study aimed to develop a tool to assess the handwriting ability of children aged 5-6 years old in Mainland China and to analyze its reliability and validity. METHODS:The investigation comprised three phases: 1) original tool generation, 2) tool revision, 3) reliability analysis (i.e., interrater, test-retest) and validity analysis (i.e., content, criterion). RESULTS:The sample included a total of 482 children. The internal consistency (Cronbach alpha) was 0.74. The test-retest correlation coefficients ranged from 0.38 to 0.80. As expected, our data showed an improving trend in handwriting, and differences in respect to age and gender. When compared with the 'handwriting difficulty' group, each subtest score of children in the 'normal' group showed significant differences (p < 0.05). The correlation validity, compared with the visual-motor integration development test (VMI), was 0.17-0.52. CONCLUSION:The Handwriting Test for Preschool Children (HT-PRE), which is a newly developed handwriting screening tool for preschool children aged 5-6 years old in Mainland China, has displayed a very good internal consistency, acceptable test-retest reproducibility, and good criterion-based validity, and has also shown good application prospects for handwriting difficulty screening in a clinical setting