Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2022-09-13 Cooperative journals: 《中国全科医学》
Abstract： Background The enlarged perivascular space ( EPVS ) is closely related to cognitive dysfunction, affective disorder, stroke and adverse outcomes after stroke. Early detection and treatment are extremely important. Objective To investigate the relationship between heart rate variability (HRV) and the brain distribution of EPVS. Methods Patients who underwent 24-hour dynamic electrocardiogram monitoring and brain Magnetic Resonance Imaging (MRI) in the Department of Neurology, the Second Affiliated Hospital of Zhengzhou University from January 2020 to May 2022 were collected and analyzed. Patients' EPVS load was assessed. The severity of basal ganglia area EPVS (BG-EPVS) and centrum semiovale EPVS (CS-EPVS) were grouped according to EPVS scores. BG-EPVS was divided into 3 groups, mild group (Potter score was 1, 126 cases), moderate group (Potter score was 2, 46 cases), severe group (Potter score was 3～4, 27 cases). CS-EPVS was divided into 3 groups, mild group (Potter score was 1, 131 cases), moderate group (Potter score was 2, 45 cases), severe group (Potter score was 3～4, 23 cases). The dominance model was divided according to the number of BG-EPVS and CS-EPVS, model 1 = BG ＞ CS (119 cases), model 2 = BG = CS (20 cases), model 3 = BG ＜ CS (60 cases). The general data and HRV parameters were compared among groups. Results The age in the mild BG-EPVS group was lower than in the severe BG-EPVS group (P ＜ 0.05). The root mean square of successive differences of Normal-Normal (NN) intervals for period of interest (rMSSD) and total power (TP) in the severe BG-EPVS group were lower than in the mild BG-EPVS group (P ＜ 0.05). Multiple Logistic regression analysis after correction for confounders showed that rMMSD was an independent influence on BG-EPVS (P=0.002), and rMMSD was an independent influence on the dominance model (P=0.003). Spearman correlation analysis showed that rMMSD, TP, and percentage of adjacent NN intervals larger than 50ms (PNN50) were negatively correlated with BG-EPVS severity (P ＜ 0.05). Average of NN intervals standard deviation every 5 minutes standard deviation for period of interest (SDNNindex) and rMMSD were positively correlated with the EPVS dominance model (P ＜ 0.05). Conclusion The decrease of rMMSD suggests that the imbalance of autonomic nervous system may lead to the destruction of blood-brain barrier or the decrease of brain metabolic waste clearance, and participate in the pathophysiology of BG-EPVS formation.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： To improve the properties of dye-sensitized solar cells (DSSC), three-dimensional ordered TiO2 hollow spheres (3DOHS-TiO2) films were synthesized using polystyrene spheres (290-300 nm) colloidal crystals as sacrificial templates. The photoelectric conversion performances of the DSSC based on double- layered films P25- TiO2/3DOHS- TiO2 were investigated. SEM results show that the orderly arranged TiO2 hollow spheres form hexangular and square arrays, and the hollow spheres connect to their neighbors through pores. The center-center spacing of the 3DOHS-TiO2 is 260-270 nm, and the thickness of the hollow shells is 40-50 nm. TEM results show that the shell is composed of a lot of tiny particles resulting in a mesoporous framework. The mean size of the anatase TiO2 nanoparticles of the shells is ca.10 nm as estimated from the HRTEM image. By compared with the P25-TiO2 nanocrystalline DSSC (η =4.32%), the DSSC based on the double-layered films P25-TiO2/3DOHS-TiO2 exhibit a higher photoelectric performance (η =6.98%). The enhancement of the cell performance can be attributed to the en-hancement of light harvesting of the light scattering ability of the layer 3DOHS-TiO2.
Subjects: Civil Engineering and Building Construction >> Civil Construction Engineering submitted time 2017-12-05 Cooperative journals: 《土木建筑工程信息技术》
Abstract：湖南航天医院门诊外科大楼平面形状为“楔型”，内部结构中部分梁柱节点存在有多根不同方向的梁交 汇于柱节点的情况，节点处钢筋密集复杂。在项目实施过程中，项目部运用BIM技术通过分层着色、合理确定钢筋 参数等方法实现了钢筋在三维模式下的空间位置精确定位、三维彩色显示、工序安排、钢筋原材定尺长度优化的目 的，提高了钢筋施工质量与原材料利用率。
Subjects: Civil Engineering and Building Construction >> Civil Construction Structures submitted time 2017-11-30 Cooperative journals: 《土木建筑工程信息技术》
Abstract：湖南航天医院门诊外科大楼平面形状为“楔型”，内部结构中部分梁柱节点存在有多根不同方向的梁交 汇于柱节点的情况，节点处钢筋密集复杂。在项目实施过程中，项目部运用BIM技术通过分层着色、合理确定钢筋 参数等方法实现了钢筋在三维模式下的空间位置精确定位、三维彩色显示、工序安排、钢筋原材定尺长度优化的目 的，提高了钢筋施工质量与原材料利用率。
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