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824 results on '"CHENG Xudong"'

1. Trimethylamine oxide and serum amyloid A in diagnosis of chronic cerebral hypoperfusion

Author

ZHANG Xin, ZHANG Jing, CHENG Xudong, ZHANG Qi, ZHOU Sen, JIA Lijun, WANG Lirong, and YU Nengwei

Subjects
chronic cerebral hypoperfusion, trimethylamine n-oxide, serum amyloid a, arterial spin labeling technique, Medicine
Abstract

ObjectiveTo investigate the diagnostic value of trimethylamine N-Oxide （TMAO） and serum amyloid A （SAA） levels in peripheral blood of patients with chronic cerebral hypoperfusion （CCH）. MethodsThe patients attending the Department of Neurology of Sichuan Provincial Peoples Hospital from February 2022 to June 2022 were divided into CCH group （n=55） and control group （n=42） based on the results of magnetic resonance arterial spin labeling （ASL）. The levels of TMAO and SAA were detected by ELISA and their diagnostic value for CCH were anaylzed by ROC curve. ResultsThe levels of TMAO （47.24±8.84 vs 40.81±8.33, t=3.639, P＜0.05） and SAA （14.04±2.70 vs 12.20±2.30, t=3.542, P＜0.05） in CCH group were significantly higher than those in control group. High levels of TMAO and SAA and history of primary hypertension were independent risk factors for the occurrence of CCH （P＜0.05）. The areas under ROC curve （AUC） of TMAO and SAA for diagnosing CCH were 0.701 （95%CI: 0.594-0.809） respectively and 0.675 （95%CI: 0.565-0.786）. The combined detection of TMAO and SAA achieved the highest AUC of 0.765 （95%CI: 0.667-0.863）. ConclusionBoth TMAO and SAA are related to the occurrence of CCH and can be used as auxiliary diagnostic indicators for CCH.

Published
2023
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7. Effect of Starch on Sintering Behavior for Fabricating Porous Cordierite Ceramic

Author

Li Ye, Cao Wei, Gong Lunlun, Zhang Ruifang, and Cheng Xudong

Subjects
cordierite, porous ceramic, starch, sintering behavior, microstructure, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

Porous cordierite ceramics were prepared with starch as pore-forming agent by solid-state method. The green bodies were sintered at 1,100–1,400 °C for 2 h. The characterization was focused on thermal analysis, phase evolution, sintering behavior, porosity and micro-structural changes. The results show that cordierite becomes the main crystallization phase at 1,200 °C. The shrinkage behavior shows the most obvious dependence on the sintering temperature and starch content, and it can be divided into three stages. Moreover, the open porosity increases with the increase of starch content, but the pore-forming effectivity decreases. Nevertheless, compared with the open porosity curves, the bulk density curves are more in line with the linear rule. The microphotographs show the densification process with the sintering temperature and the variation of pore connectivity with the starch content.

Published
2016
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8. PROPERTIES OF HIGHLY POROUS CORDIERITE CERAMIC OBTAINED BY DIRECT FOAMING AND GELCASTING METHOD

Author

Ye Li, Wei Cao, Gong Lunlun, Zhang Ruifang, and Cheng Xudong

Subjects
Porous ceramic, Cordierite, Porosity, Thermal conductivity, Sintering degree, Clay industries. Ceramics. Glass, TP785-869
Abstract

The highly porous cordierite ceramics were fabricated combining the merits of direct foaming and gelcasting method. The content of gum arabic had a great influence on the foaming capacity and the stability of the wet slurry foam. And the foaming capacity mainly affected the porosity while the stability mainly affected the pore size. The highest porosity of 90% was obtained at 0.4 wt.% gum arabic content and the smallest pore size and the most homogeneous pore distribution were arrived at 1.2 wt.% gum arabic content. As the sintering temperature increased, the porosity and pore size decreased but the uniformity of the pore distribution increased. Moreover, the thermal conductivity was mainly affected not only by the porosity, but also by the sintering degree of the cordierite substrate.

Published
2016
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