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63 results on '"Xu Xinhua"'

15. Carbon black supported ultra-high loading silver nanoparticle catalyst for electro-oxidation and determination of hydrazine

Author

XU XinHua, Liu Jingjun, Tan Chang, Wang Feng, LI ZhiLin, and Ji Jing

Subjects
Materials science, Reducing agent, Hydrazine, Inorganic chemistry, General Chemistry, Carbon black, Chronoamperometry, Silver nanoparticle, Thermogravimetry, chemistry.chemical_compound, chemistry, Cyclic voltammetry, Ethylene glycol, Nuclear chemistry
Abstract

Carbon black supported ultra-high loading silver nanoparticle catalyst (Ag/CB) was prepared by a modified ethylene glycol reduction method, using ethylene glycol as the reducing agent and sodium hydroxide as the pH adjusting agent. The X-ray diffraction, thermogravimetry and scanning electron microscopy characterizations showed that the Ag nanoparticles crystallized with a face-centered cubic structure and were densely stacked on the CB surface without aggregation, despite such a small average size (ca. 10 nm) and an ultra-high loading mass (392 wt.%). The electrochemical evaluation based on cyclic voltammetry, chronoamperometry and polarization tests revealed that the ultra-high loading Ag/CB catalyst possessed a superior electrocatalytic activity for the oxidation of hydrazine, via a diffusion-limited process and a 4-electron transfer pathway. Moreover, the chronoamperometry response on an electrode modified with this ultra-high loading Ag/CB catalyst exhibited a promising application for determination of hydrazine, due to a broad linear calibration ranging from 50 to 800 μM, a high sensitivity of 0.03795 μA/μM and a low detection limit of 3.47 μM.

Published
2013

24. Expression of Cyclooxygenase-2 in Nasopharyngeal Carcinoma and Its Relation to Angiogenesis and Prognosis

Author

Chen Yan, Li Song, XU Xinhua, LI Dao-jun, Guoqing Hu, Dai Delan, and Xue Feng

Subjects
Oncology, medicine.medical_specialty, business.industry, Angiogenesis, Microvascular Density, Nasopharyngeal neoplasm, medicine.disease, Vascular endothelial growth factor, chemistry.chemical_compound, Nasopharyngeal carcinoma, chemistry, Surgical oncology, Internal medicine, medicine, Immunohistochemistry, business, Pathological
Abstract

Objective: The purpose of this study was to evaluate cyclooxygenase-2 (COX-2) expression in nasopharyngeal carcinoma (NPC) and its correlation with clinicopathologic features, angiogenesis, and prognosis. Methods: The expressions of COX-2 and vascular endothelial growth factor (VEGF) and microvascular density (MVD) were determined with immunohistochemical methods in eighty-six NPC patients followed up over 5 years. Results: Sixty-three tumors (73.3%) were classified as COX-2 positive. COX-2 expression was positively related to VEGF expression (r=0.438, P

Published
2006

25. [Untitled]

Author

Jiang Hong, Xu Xinhua, Shi Huixiang, and Wang Da-hui

Subjects
Environmental Engineering, business.industry, Ecological Modeling, Environmental engineering, Energy consumption, Pollution, Emission intensity, Energy sector, Agricultural economics, Agriculture, Greenhouse gas, Per capita, Environmental Chemistry, Environmental science, Statistical analysis, National average, business, Water Science and Technology
Abstract

This paper has attempted to do a statistical analysis of the inventory of greenhouse gas emissions from Jiangsu province in 1990, based on the methods provided in IPCC Guidelines (1995), hereby to investigate and evaluate the present situation of emissions of GHGs such as CO2, CH4 from the energy sector, industries, and agriculture. The study has found the annual per capita GHG emissions as follows: CO2, 1.97 ton/person; CH4, 22.65 kg person-1; N2O, 0.11 kg person-1. The emission levels are close to the national average, and half of the world average. Energy consumption activities, among other activities, is the main source of CO2 emission in Jiangsu province, which accounts for 91.6% of the total emission. The emission of CH4 can be traced mainly to the cultivation of rice, which accounts for 44.1% of the emission.

Published
1999

34. A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core–shell hierarchical composite as high-performance anode material for lithium ion batteries

Author

Ma, Daqian, primary, Bi, Peng, additional, Meng, Haowen, additional, Yu, Xiaohui, additional, Dou, Peng, additional, Yang, Hongyan, additional, Sun, Yanli, additional, Cao, Zhenzhen, additional, Zheng, Jiao, additional, Wang, Chao, additional, and Xu, Xinhua, additional

Published
2015
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