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| 1 | Constrained Bézier curves' best multi-degree reduction in the L_2-norm显示文摘In computer aided geometric design, the degree reduction of the parameter curve is a key technique in data exchange and data compression. The various existing methods of degree reduction cannot decide whether the degree reduction curve satisfying the given tolerance exists beforehand, cannot give approximation of the best multi-degree reduction, or cannot provide explicit expression and error formula of the degree reduction curve. In this paper, we propose an entirely new method, which can hurdle the above flaws completely. For a given Bézier curve of degree n, we can easily decide whether a Bézier reduction curve of degree m exists, which has equal derivatives with the given curve up to (r-1)-th and (s-1)-th orders (r,s≤m) respectively at the endpoints, so the approximating error is less than the given tolerance ε in the L2-norm. If the curve exists, the explicit expression can be given. | ZHANG Renjiang WANG Guojin | 2005 | Progress in Natural Science:Materials International2005，15，9： | 20 |
| 2 | A multi-residue method for fast determination of pesticides in tea by ultra performance liquid chromatography–electrospray tandem mass spectrometry combined with modified QuEChERS sample preparation procedure显示文摘 | Guoqiang Chen Pengying Cao Renjiang Liu | 2010 | Food Chemistry2010，，4： | 2 |
| 3 | AN ASYMPTOTIC EXPANSION FORMULA FOR BERNSTEIN POLYNOMIALS ON A TRIANGLE显示文摘In this paper,an asymptotic expansion formula for approximation to a continuous function by Bernsteinpolynomials on a triangle is obtained. | Zhang Renjiang (China Institute of Metrology, China) | 1998 | Analysis in Theory and Applications1998，14，1： | 2 |
| 4 | A multi- residue method for fast determination of pesticides in tea by ultra performance liquid chromatography-electrospray tan- dem mass spectrometry combined with modified QuEChERS sample preparation procedure显示文摘 | Guoqiang Chen Pengying Cao Renjiang Liu | 2011 | Food Chemistry2011，125，4： | 1 |
| 5 | The mechanism of high-pressure high-temperature and low permeability acid pretreatment to reduce fracturing pressure显示文摘 | DENG Yan XUE Renjiang GUO Jianchun | 2011 | Journal of Southwest Petroleum University(Science&Technology Edition)2011，33，3： | 1 |
| 6 | A multi- residue method for fast determination of pesticides in tea by ultra performance liquid chromatography-electrospray tandem mass spectrometry combined with modified QuEChERS sample preparation procedure 显示文摘 | CHEN Guoqiang CAO Pengying LIN Renjiang | 2011 | Food Chem2011，125，4： | 1 |
| 7 | Template synthesis of CeO2 ordered nanowire arrays materials 显示文摘 | La Renjiang Hu Zhongai Li Hulin | 2004 | Science and Engineering: A2004，368，12： | 1 |
| 8 | Some improvements on the derivative bounds of rational B6izer curves and surfaces显示文摘 | Zhang Renjiang Ma Weiyan | 2006 | Computer Aided Geometric Design2006，23，： | 1 |
| 9 | A multi-residue method for fast determination of pesticides in tea by ultra performance liquid chromatography-electrospray tandem mass spectrometry combined with modified QuEChERS sample preparation procedure显示文摘 | CHEN Guoqiang CAO Pengying LIU Renjiang | 2011 | Food Chem2011，125，： | 1 |
| 10 | A multi-residue method for fast determination of pesticides in tea by ultra performance liquid chromatography-electrospray tandem mass spectrometry combined with modified QuEChERS sample preparation procedure显示文摘 | Chen Guoqiang Cao Pengying Liu Renjiang | 2011 | Food Chemistry2011，125，4： | 1 |
| 11 | Amulti-residue method for fast determination of pesticides intea by ultra performance liquid chromatography–electrospraytandem mass spectrometry combined with modifiedQuEChERS sample preparation procedure显示文摘 | Guoqiang Chen Pengying Cao Renjiang Liu | 2011 | Food Chemistry2011，125，4： | 1 |
| 12 | Characterization of Fe-containing particles in Chengdu,southwest China,using single-particle aerosol mass spectrometry显示文摘Single-particle aerosol mass spectrometry was used to study the characteristics of Fecontaining particles during winter in Chengdu,southwest China.The mass concentrations of PM_(2.5)and PM_(10)during the study period were 64±38 and 89±49μg/m~3,respectively,and NO_(2)and particulate matter were high compared with most other regions of China.The Fecontaining particles were divided into seven categories with different mass spectra,sources and aging characteristics.The highest contribution was from Fe mixed with carbonaceous components(Fe-C,23.1%)particles.Fe was more mixed with sulfate than nitrate and therefore the contribution of Fe mixed with sulfate(Fe-S,20.7%)particles was higher than that of Fe mixed with nitrate(Fe-N,12.5%)particles.The contributions from Fe-containing particles related to primary combustion were high in the small particle size range,whereas aged Fecontaining particles and dust-related particles were mostly found in the coarse particle size range.The air masses mainly originated from the west and east of Chengdu,and the corresponding PM_(2.5)concentrations were 79±36 and 55±36μg/m~3,respectively.The west and east air masses showed stronger contributions of Fe-containing particles related to biomass burning(Fe-B)and fossil fuel combustion(Fe-C and Fe-S)particles,respectively.The southwest area contributed the most Fe-containing particles.Future assessments of the effects of Fe-containing particles during heavy pollution period should pay more attention to Fe-C and Fe-S particles.Emission-reduction of Fe-containing particles should consider both local emissions and short-distance transmission from the surrounding areas. | Renjiang He Junke Zhang Luyao Chen Wei Zhang Yingwei Xi | 2024 | Journal of Environmental Sciences2024，，2： | 0 |
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