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| 1 | RESUSPENSION METHOD FOR ROAD SURFACE DUST COLLECTION AND AERODYNAMIC SIZE DISTRIBUTION CHARACTERIZATION显示文摘Traffic-generated fugitive dust is a source of urban atmospheric particulate pollution in Beijing. This paper introduces the resuspension method, recommended by the US EPA in AP-42 documents, for collecting Beijing road-surface dust. Analysis shows a single-peak distribution in the number size distribution and a double-peak mode for mass size distribution of the road surface dust. The median diameter of the mass concentration distribution of the road dust on a high-grade road was higher than that on a low-grade road. The ratio of PM2.5 to PM10 was consistent with that obtained in a similar study for Hong Kong. For the two selected road samples, the average relative deviation of the size distribution was 10.9% and 11.9%. All results indicate that the method introduced in this paper can effectively determine the size distribution of fugitive dust from traffic. | Jianhua Chen Hongfeng Zheng Wei Wang Hongjie Liu Ling Lu Linfa Bao Lihong Ren | 2006 | China Particuology2006，4，6： | 7 |
| 2 | Rigid polyurethane foam reinforced with cellulosewhiskers: Synthesis and characterization显示文摘A novel nanocomposite of rigid polyurethane foam was prepared by the polymerization of a sucrose-based polyol, a glycerol-based polyol and polymeric methylene diphenyl diisocyanate in the presence of cellulose whiskers. The cell morphology of the resulting foams was examined by scanning electron microscopy which showed both the pure foam and the nanocomposite foam had homogeneous cell dispersion and uniform cell size of approximately 200 μm. Analysis of the foams by Fourier transform infrared(FT-IR) spectroscopy indicated that both samples exhibited signals attributed to the polyurethane including the NH stretching and bending vibrations at 3320 cm^(-1) and 1530 cm^(-1), the OC=O vibration at 1730 cm^(-1) and the CO-NH vibration at 1600 cm^(-1). FT-IR analysis of the nanocomposite indicated that cellulose whiskers were crosslinked with the polyurethane matrix as the signal intensity of the OH stretch at 3500 cm^(-1) was significantly reduced in comparison to the spectral data acquired for a control sample prepared from the pure polyurethane foam mixed with cellulose whiskers. According to ASTM standard testing procedures, the tensile modulus, tensile strength and yield strength of the nanocomposite foam were found to be improved by 36.8%, 13.8% and 15.2%, and the compressive modulus and strength were enhanced by 179.9% and 143.4%, respectively. Dynamic mechanical analysis results testified the improvements of mechanical properties and showed a better thermal stability of the nanocomposite foam. | Yang Li Hongfeng Ren Arthur J.Ragauskas | 2010 | Nano-Micro Letters2010，2，2： | 3 |
| 3 | Simultaneous determination of multi-component mycotoxin contaminants in foods and feeds by ultra-performance liquid chromatography tandem mass spectrometry显示文摘 | Yiping Ren Yu Zhang Shuangliang Shao Zengxuan Cai Liang Feng Hongfeng Pan Zhigang Wang | 2006 | Journal of Chromatography A2006，，1： | 3 |
| 4 | Simultaneous determination of multi-component mycotoxin contaminants in foods and feeds by ultra-performance liquid chromatography tandem mass spectrometry显示文摘 | Yiping Ren Yu Zhang Shuangliang Shao Zengxuan Cai Liang Feng Hongfeng Pan Zhigang Wang | 2006 | Journal of Chromatography A2006，，1： | 1 |
| 5 | Simultaneous determination of multi-component mycotoxin contaminants in foods and feeds by ultra-performance liquid chromatography tandem mass spectrometry显示文摘 | Yiping Ren Yu Zhang Shuangliang Shao Zengxuan Cai Liang Feng Hongfeng Pan Zhigang Wang | 2006 | Journal of Chromatography A2006，，1： | 1 |
| 6 | Metformin reduces lipolysis in primary rat adipocytes stimulated by tumor necrosis factor-a or isoprotereuol 显示文摘 | REN Tingting HE Jinhan JIANG Hongfeng | 2006 | Mol Eudoerinol2006，37，： | 1 |
| 7 | Mefformin reduces lipolysis in primary rat adipocytes stimulated by tumor necrosis factor-alpha or isoproterenol 显示文摘 | Ren Tingting He Jinhan Jiang Hongfeng | 2006 | Mol Endocrinol2006，37，： | 1 |
| 8 | Darboux transformation for a generalized Hirota-Satsuma coupled Korteweg-de Vries equation显示文摘 | Geng Xianguo Ren Hongfeng He Guoliang | 2009 | Phys Rev E2009，79，05： | 1 |
| 9 | Regulation of autophagic flux by CHIP显示文摘Autophagy is a major degradation system which processes substrates through the steps of autophagosome formation, autophagosome-lysosome fusion, and substrate degradation. Aberrant autophagic flux is present in many pathological conditions including neurodegeneration and tumors. CHIP/STUB1, an E3 ligase, plays an important role in neurodegeneration. In this study, we identified the regulation of autophagic flux by CHIP(carboxy-terminus of Hsc70-interacting protein). Knockdown of CHIP induced autophagosome formation through increasing the PTEN protein level and decreasing the AKT/m TOR activity as well as decreasing phosphorylation of ULK1 on Ser757. However, degradation of the autophagic substrate p62 was disturbed by knockdown of CHIP, suggesting an abnormality of autophagic flux. Furthermore, knockdown of CHIP increased the susceptibility of cells to autophagic cell death induced by bafilomycin A1. Thus, our data suggest that CHIP plays roles in the regulation of autophagic flux. | Dongkai Guo Zheng Ying Hongfeng Wang Dong Chen Feng Gao Haigang Ren Guanghui Wang | 2015 | Neuroscience Bulletin2015，31，4： | 1 |
| 10 | Mefformin reduces lipolysis in primary rat adipocytes stimulated by tumor necrosis factor-alpha or isoproterenol显示文摘 | Ren Tingting He Jinhan Jiang Hongfeng | 2006 | J Mol Endocrinol2006，37，： | 1 |
| 11 | Outcomes of allograft from donor kidney microthrombi and secondary recipient thrombotic microangiopathy: should we consider loosening the belt?显示文摘There is currently a huge worldwide demand for donor kidneys for organ transplantation.Consequently,numerous marginal donor kidneys,such as kidneys with microthrombi,are used to save patients'lives.While some studies have shown an association between the presence of microthrombi in donor kidneys and an increased risk for delayed graft function(DGF)(McCall et al.,2003;Gao et al.,2019),other studies have demonstrated that microthrombi negatively impact the rate of DGF(Batra et al.,2016;Hansen et al.,2018),but not graft survival rate(McCall et al.,2003;Batra et al.,2016;Gao et al.,2019).In contrast,Hansen et al.(2018)concluded that fibrin thrombi were not only associated with reduced graft function six months posttransplantation but also with increased graft loss within the first year of transplantation.On the other hand,Batra et al.(2016)found no significant differences in the DGF rate or one-year graft function between recipients in diffuse and focal microthrombi groups.To date,however,the overall influence of donor kidney microthrombi and the degree of influence on prognosis remain controversial,necessitating further research. | Yamei CHENG Luying GUO Xue REN Zhenzhen YANG Junhao LV Huiping WANG Wenhan PENG Hongfeng HUANG Jianyong WU Jianghua CHEN Rending WANG | 2023 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2023，24，6： | 0 |
| 12 | Fabrication and Properties of Ti_3SiC_2/SiC Composites显示文摘Ti3SiC2/SiC composites were fabricated by reactive hot pressing method. Effects of hot pressing temperature, the content and particle size of SiC on phase composition, densification, mechanical properties and behavior of stress-strain of the composites were investigated. The results showed that: (1) Hot-pressing temperature influenced the phase composition of Ti3SiC2/SiC composites. The flexural strength and fracture toughness of composites increased with hot pressing temperature. (2) It became more difficult for the composites to densify when the content of SiC in composites increased. It need be sintered at higher temperature to get denser composite. The flexural strength and fracture toughness of composites increased when the content of SiC added in composites increased. However, when the content of SiC reached 50 wt%, the flexural strength and fracture toughness of composites decreased due to high content of pore in composites. (3) When the content of SiC was same, Ti3SiC2/SiC composites were denser while the particle size of SiC added in composites is 12.8 μm compared with the composites that the particle size of SiC added is 3 μm. The flexural strength and fracture toughness of composites increased with the increase of particle size of SiC added in composites. (4) Ti3SiC2/SiC composites were non-brittle fracture at room temperature. | YIN Hongfeng FAN Qiang REN Yun ZHANG Junzhan | 2008 | China's Refractories2008，17，1： | 0 |
| 13 | Synthesis of Si3N4 Powder Using Sawdust as Carbon Source显示文摘Si_3N_4 powder was synthesized by carbothermal reduction nitridation reaction using sawdust as carbon source and introducing SiO_2 by silica sol immersion.Effects of Si O2 content of silica sol,molding pressure,reaction temperature,reaction duration,and N_2 flow rate on phase compositions and microstructure of resultants were studied. The results show that using7. 5 mass% SiO_2 containing silica sol immersed sawdust as raw materials,the prepared Si3N4 powder is featured with high α-Si_3N_4 content,few impurities,etc. in the conditions of 1 450 ℃ of reaction temperature,9h of reaction duration,400 m L·min- 1of N_2 flow rate and 10 MPa of molding pressure. | MA Xiaochen YIN Hongfeng ZHANG Junzhan REN Yun | 2016 | China's Refractories2016，25，2： | 0 |
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