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| 1 | Vegetation cover change and the driving factors over northwest China显示文摘In this paper the spatio-temporal variation of vegetation cover in northwest China during the period of 1982-2006 and its driving factors were analyzed using GIMMS/NDVI data. The annual average NDVI was increased with a rate of 0.0005/a in northwest China and there was an obvious difference between regions. The trend line slopes of NDVI were higher than 0.0005 in the Tianshan Moutains and Altay Mountains of Xinjiang,the Qilian Mountains of Gansu and the eastern part of Qinghai,which indicated the vegetation cover was significantly increased in these areas. The trend line slopes of NDVI were lower than 0.0005 in the southern region of Qinghai,the border regions of Shaanxi and Ningxia,the parts of Gansu and Tarim Basin,Turpan and Tuoli in Xinjiang,which indicated the vegetation cover was declined in these areas. The NDVI of woodland,grassland and cultivated land had an ascending tendency during the study period. The study shows that the vegetation cover change was caused by both natural factors and human activities in northwest China. The natural vegetation change,such as forests was influenced by climate change,while human activities were the main reason to the change of planting vegetation. The changes of vegetation covers for different elevations,slopes and slope aspects were quite different. When the elevation is exceeded to 4,000 m,the NDVI increasing trend was very low;the NDVI at the slope of less than 25° was increased by the ecological construction;the variation of NDVI on sunny slope was stronger than that on shady slope. The temperature rose significantly in recent 25 years in northwest China by an average rate of 0.67oC/10a,and precipitation increased by an average rate of 8.15 mm/10a after 1986. There was positive correlation between vegetation cover and temperature and annual precipitation changes. Rising temperature increased the evaporation and drought of soils,which is not conducive to plant growth,and the irrigation in agricultural areas reduced the correlation between agricultural vegetation NDVI and precipitation. The improvement of agricultural production level and the projects of ecological construction are very important causes for the NDVI increase in northwest China,and the ecological effect of large-scale ecological construction projects has appeared. | ShengPei DAI Bo ZHANG HaiJun WANG YaMin WANG LingXia GUO XingMei WANG Dan LI | 2011 | Journal of Arid Land2011，3，1： | 22 |
| 2 | Selective oxidation of biomass derived 5-hydroxymethylfurfural to 2,5-diformylfuran using sodium nitrite显示文摘A mild and simple process for the effective oxidation of 5-hydroxymethylfurfural(HMF) into 2,5-diformylfuran(DFF) has been developed using Na NO_2 as the oxidant. Some important reaction parameters were investigated to optimize the oxidation of HMF into DFF. It was found that the reaction solvent was very crucial for this reaction. Trifluoroacetic acid was the best solvent for the oxidation of HMF into DFF by Na NO_2.Under the optimal reaction condition, almost quantitative HMF conversion and high DFF yield of 90.4% were obtained after 1 h at room temperature. | Xianxiang Liu Hui Ding Qiong Xu Wenzhou Zhong Dulin Yin Shengpei Su | 2016 | Journal of Energy Chemistry2016，25，1： | 4 |
| 3 | Changes of annual accumulated temperature over Southern China during 1960-2011显示文摘The spatial and temporal variations of ≥10°C annual accumulated temperature(AAT10) were analyzed by using the linear trend line method, cumulative anomaly method and the multiple linear regression model(MLRM) interpolation method based on the daily meteorological observation data from 104 meteorological stations in Southern China and surrounding 39 meteorological stations from 1960 to 2011. The results show that:(1) From time scale point of view, the climatic trend of the AAT10 increased with an average of 7.54°C/decade in Southern China since 1960. The area of AAT10<6000°C decreased from 1960 to 2011, and the area of 6000°C8000°C increased from 1960 to 2011.(2) From spatial scale point of view, the AAT10 in Southern China reduced with increasing latitude and reduced with increasing altitude. The proportion of the area with 5000°C< AAT10<8000°C accounted for 70% of the study area, followed by the area of 4000°C8000°C was the least. Climate trend rate of the AAT10 at 99% of the meteorological stations was greater than zero, which indicated that the AAT10 increased significantly in the central Yunnan province, southern Guangdong province as well as Hainan Island.(3) Comparison of period A(1960–1989) and period B(1980–2011) with the change of temperature zones shows that the boundaries of cool temperate zone, mid-temperate zone and warm temperate zone shifted northward and shrank westward. The northern boundary of north subtropical zone and mid-subtropical zone shifted northward gradually by over 0.5° and 0.5° latitude, respectively. The western part of northern boundary of south subtropical zone and marginal tropical zone shifted northward by 0.2° and 0.4° latitude, respectively. The change of temperature zones was expanded to high altitude and latitude.(4) The increase of the AAT10 is conducive to the production of tropical crops planted, which will increase the planting area that was suitable for tropical crops, and expand the planting boundaries to high latitude and high altitude. | DAI Shengpei LI Hailiang LUO Hongxia ZHAO Yifei ZHANG Kexin | 2015 | Journal of Geographical Sciences2015，25，10： | 4 |
| 4 | In situ time-resolved FTIRS study of adsorption and oxidation of ethylene glycol on Pt(100) electrode显示文摘Adsorption and oxidation of ethylene glyco(EG) on Pt(100) electrode were studied by in situ timeresolved FTIRS (TRFTIRS). The TRFTIR spectra recordedat 0.10 V illustrate that an IR band appears near 2050 cm?at t > 5 s, corresponding to linearly bonded CO formed indissociative adsorption of EG. The TRFTIR results haveconfirmed also that CO species are distributed uniformly onPt(100) surface. Another band appears near 2342 cm?1 at > 70 s, associating with IR absorption of CO2 produced inthe direct oxidation of EG. With the increase of electrodepotential, the direct oxidation of EG becomes gradually themain reaction. When the potential is above 0.40 V, the oxidation of EG occurs mainly via the reactive intermediates, i.especies containing –COOH determined by in situ TRFTIRS. | FAN Youjun ZHOU Zhiyou FAN Chunjie ZHEN Chunhua CHEN Shengpei SUN Shigang | 2005 | Chinese Science Bulletin2005，50，18： | 2 |
| 5 | Simultaneous determination of water-soluble and fat-soluble synthetic colorants in foodstuff by high-performance liquid chromatography–diode array detection–electrospray mass spectrometry显示文摘 | Ming Ma Xubiao Luo Bo Chen Shengpei Su Shouzhuo Yao | 2005 | Journal of Chromatography A2005，，1： | 2 |
| 6 | A novel pulse density modulated high-frequency inverter for silent-discharge-type ozonizer显示文摘 | Koudriavtsev Shengpei Wang Konishi | 2002 | IEEE Transactions on Industry Applications2002，38，2： | 1 |
| 7 | The thermal degradation of nanocomposites that contain an oligomeric ammonium cation on the clay显示文摘 | Su Shengpei Wikie C A | 2004 | Ploym Degrad Stab2004，83，2： | 1 |
| 8 | Synthesis and characterization of novel swelling tunable olignmeric poly( styrene-co-acrylamide) modified clays显示文摘 | Chen ruyi Peng Fubing Su Shengpei | 2008 | J Appl Polym Sci2008，108，4： | 1 |
| 9 | A Novel Pulse-Density-Modulated High-Frequency Inverter for Silent-Discharge-Type Ozonier显示文摘 | Oleg Kordriavtsev Shengpei Wang | 2002 | IEEE Trans on Industry Applications2002，38，2： | 1 |
| 10 | Additional XPS studies on the degradation of poly,(methyl metha crylate) and polystyrene nanocomposites显示文摘 | Jianxin Du Jianqi Wang Shengpei Su Charles A Wilkie | | 0，，： | 1 |
| 11 | Suppression of seismic surface waves based on adaptive weighted super-virtual interferometry显示文摘For land seismic surveys, the surface waves are the dominant noises that mask the effective signals on seismograms.The conventional methods isolate surface waves from the effective signals by the differences in frequencies or apparent velocities,but may not perform well when these differences are not obvious. Since the original seismic interferometry can only predict inter-receiver surface waves, we propose the use of super-virtual interferometry(SVI), which is a totally data-driven method, to predict shot-to-receiver surface waves, since this method relieves the limitation that a real shot should collocate with one of the receivers for adaptive subtraction. We further develop the adaptive weighted SVI(AWSVI) to improve the prediction of dispersive surface waves, which may be generated from heterogeneous media at the near surface. Numerical examples demonstrate the effectiveness of AWSVI to predict dispersive surface waves and its applicability to the complex near surface. The application of AWSVI on the field data from a land survey in the east of China improves the suppression of the residual surface waves compared to the conventional methods. | AN ShengPei HU TianYue | 2016 | Science China Earth Sciences2016，59，11： | 1 |
| 12 | Preparation and Properties of Bio-Based Flame Retardant L-APP/Poly(L-lactic acid)Composites显示文摘Poly(L-lactic acid)(PLLA)is a thermoplastic material with complete degradability,high biocompatibility and excellent mechanical properties.It can replace petroleum-based polymers are currently being used in the fields of packaging,agriculture,textiles,medical and so on.However,PLLA’s extremely flammability greatly limits its wider application.An bio-based flame retardant L-APP/PLLA composites was prepared by melt blending of the L-APP and PLLA.The morphology,impact properties,thermal properties and flame retardant properties of composites were investigated by field emission scanning electron microscope(SEM),impact tester,differential scanning calorimeter(DSC),thermogravimetric analyzer(TGA),limiting oxygen indexer(LOI)and horizontalvertical burning tester.The results showed that the degree of crystallization(X_(c))and LOI of L-APP/PLLA composites increased as increasing of L-APP content.What’s more,the impact strength first increased and then decreased,the glass transition temperature(T_(g))and melting temperature(T_(m))do not changed significantly.The impact strength of composites was 9.1 kJ/m^(2) at a 5 wt%loading for L-APP,which was the highest level.When the content of L-APP was 20%,the LOI was 30.8%,the Xc was 42.3%and the UL-94 level was V-0.This research can promote the value-added utilization of lignin and the application of PLLA in the fields of flame retardant materials. | Qionglin Luo Mingliang Wang Hui Zhang Yuejun Ouyang Hongwei Lin You Shu Shengpei Su | 2021 | Journal of Renewable Materials2021，9，12： | 1 |
| 13 | Study on the surface-modification of nano-hydroxyapatite with lignin and the corresponding nanocomposite with poly (lactide-co-glycolide)显示文摘To obtain nano-hydroxyapatite/poly(lactideco-glycolide)(n-HA/PLGA)nanocomposite with superior mechanical properties,here,lignin was chosen to surfacemodify for n-HA through co-precipitation method.The different reaction conditions of reaction time,phosphorus source,and the lignin addition amount were studied by fourier transformation infrared spectra,X-ray diffraction,the intuitionistic dispersion experiment,transmission electron microscope and thermal gravimetric analysis.The reaction mechanism and the best appropriate reaction condition were obtained.More importantly,the results of electromechanical universal tester,scanning electron microscope,differential scanning calorimetric analyzer,polarized optical microscopy and dynamic mechanical analysis confirmed that the obtained n-HA could greatly increase the mechanical strength of PLGA,owing to the excellent dispersion and promotion crystallization effect.Moreover,in vitro cell culture experimental results indicated that the n-HA surface-modified by lignin was favorable to improve the cell biocompatibility of PLGA.The study suggested that the introduction of lignin was a novel method to acquire a highly dispersed n-HA,which would provide a new idea to achieve the n-HA/PLGA nanocomposite as bone materials in future,and it would pave the way towards a new application of lignin in biomedical field. | Haojie Ding Liuyun Jiang Chunyan Tang Shuo Tang Bingli Ma Na Zhang Yue Wen Yan Zhang Liping Sheng Shengpei Su Xiang Hu | 2021 | Frontiers of Chemical Science and Engineering2021，15，3： | 1 |
| 14 | Methacrylate modified clays and their polystyrene and poly ( methyl methacrylate) nanocomposites显示文摘 | Su Shengpei Jiang David Dayue Wilkie C A | 2004 | Polym Adv Techn2004，15，90： | 1 |
| 15 | Synthesis and characterization of novel swelling tunable oligomeric poly( styrene-co-acrylamide) modified clays 显示文摘 | Chen Ruyi Peng Fubing Su Shengpei | 2008 | J Appl Polym Sci2008，108，4： | 1 |
| 16 | Preparation and Properties of Bio-Based Flame Retardant Polyvinyl Alcohol显示文摘Polyvinyl alcohol (PVA) has been widely used in the fields of medical, food and packaging due to its excellentbiocompatibility, good fiber-forming and film-forming properties. However, the high flammability of PVA hasgreatly limited its wider applications. The flame-retardant PVA was prepared by melt blending of a bio-basedflame retardant (prepared from lignin, phosphoric acid and carbamide) with thermoplastic PVA (TPVA). Thechemical structure, morphology, thermal properties, mechanical properties, fire property and fluidity of thisflame retardant PVA were investigated by Fourier transform infrared spectrometer(FTIR), field emission scanning electron microscope(SEM), thermogravimetric analyzer(TGA), impact tester, universal testing machine,horizontal-vertical burning tester, limiting oxygen indexer(LOI) and melt flow rate meter(MFR). The resultsshowed that the prepared flame retardant had good compatibility with the PVA substrate;The impact strength,melt flow rate, fire property and char residue of this PVA material increased with the content of bio-based flameretardant. When the content of flame retardant was of 20%, the five indices including impact strength, meltflow rate, UL-94 level, LOI and char residual were 11.3 KJ/m^(2), 21.2 g/10 min, V-0 UL-94 level, 33.1%, and19.2%, respectively. This research can promote the high-value utilization of lignin and the application ofPVA in the fields of fire protection. | You Shu Qionglin Luo Hongwei Lin Yuejun Ouyang Xiaomin Zhang Liping Sheng Shengpei Su | 2021 | Journal of Renewable Materials2021，9，5： | 1 |
| 17 | A novel pulse-density-modulated high-frequency inverter for silent-discharge-type ozonizer 显示文摘 | Koudriavtsev O Shengpei Wang Konishi Y | 2002 | IEEE Transactions on Industry Applications2002，38，2： | 1 |
| 18 | The effects of intralayer metal composition of layered double hydroxides on glass transition, dispersion,thermal and fire properties of their PMMA nanocomposites 显示文摘 | CHARLES M N DAN C SHENGPEI S | 2009 | Thermochimica Acta2009，495，12： | 1 |
| 19 | The Effect of Boron-containing Layered Hydroxy Salt (LHS) on the Thermal Stability and Degradation Kinetics olc Poly (methyl methacrylate)显示文摘 | Stephen Majoni Shengpei Su Jean M Hossenlopp | 2010 | Polymer Degradation and Stability2010，95，： | 1 |
| 20 | Synthesis and characterization of novel swelling tunable oligomeric poly (styrene-co-acrylamide) modified clays显示文摘 | CHEN ruyi PENG Fubing SU Shengpei | 2008 | J Appl Polym Sci2008，108，： | 1 |
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