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| 1 | Positional Electronic Effects in Iminopyridine-N-oxide Nickel Catalyzed Ethylene Polymerization显示文摘A series of dibenzhydryl-based iminopyridine-N-oxide ligands bearing a range of electron-donating or-withdrawing substituents(OMe,H;and NO_(2))and corresponding nickel pre-catalysts are prepared and characterized.The substituents are installed at different positions on the ligand structure,including 4-position of the pyridine-N-oxide moiety(position X)and 4-position of the aniline moiety(position Y).These nickel pre-catalysts are highly active in ethylene polymerization with the addition of very little amount of aluminum cocatalysts,leading to the formation of polyethylenes with molecular weights of well above one million.Electron-donating substituents make the catalysts sensitive to polymerization temperature.In contrast,the catalysts bearing electron-withdrawing NO_(2) substituents show relatively steady performances at different temperatures.Most importantly,we demonstrate that different substituents and different positions both play important roles in determining the properties of nickel catalysts.This provides an alternative strategy for the future design of high-performance polymerization catalyst. | Mingjun Chi Ao Chen Wenmin Pang Chen Tan Changle Chen | 2021 | Chinese Journal of Chemistry2021，39，6： | 2 |
| 2 | Analysis of molecular variation in porcine reproductive and respiratory syndrome virus in China between 2007 and 2012显示文摘In the present study, 89 porcine reproductive and respiratory syndrome virus(PRRSV) isolates in China during 2007 to 2012 were randomly selected from the GenBank genetic sequence database. Evolutionary characteristics of these isolates were analyzed based on the sequences of non-struc-tural protein 2(Nsp2) and glycoprotein 5(GP5). The genetic variations of the isolates were also compared with six representative strains. The results showed that a high degree of genetic diversity exists among the PRRSV population in China. Highly pathogenic PRRSV isolates, with a discon-tinuous deletion of a 30 amino acid residue in the Nsp2 region, remained the most dominant virus throughout 2007–2012 in China. Owing to the extensive use of representative vaccine strains, natu-ral recombination events occurred between strains. Three isolates – HH08, DY, and YN-2011 – were more closely related to vaccine strains than the other isolates. Both YN-2011 and DY were the evolu-tionary products of recombination events between strains SP and CH-1R. The results of the present study provide useful information for the epidemiology of PRRSV as well as for vaccine development. | Yuhang Cao Hongsheng Ouyang Mingjun Zhang Fuwang Chen Xin Yang Daxing Pang Linzhu Ren | 2014 | Virologica Sinica2014，29，3： | 2 |
| 3 | Analysis of 3D microtopography in machined KDP crystal surfaces based on fractal and wavelet methods显示文摘 | Mingjun Chen Qilong Pang Jinghe Wang Kai Cheng | 2007 | International Journal of Machine Tools and Manufacture2007，，7： | 1 |
| 4 | In situ synthesized (ZrB2+ZrC) hybrid short fibers reinforced Zr matrix composites for nuclear applications显示文摘 | She Jia Zhan Yongzhong Pang Mingjun | 2011 | International Journal of Refractory Metals and Hard Materials2011，29，3： | 1 |
| 5 | A modified optical flow algorithm based on bilateral-filter and multi-resolution analysis for PIV image processing显示文摘 | Baocheng Shi Jinjia Wei Mingjun Pang | 2014 | Flow Measurement and Instrumentation2014，38，8： | 1 |
| 6 | In situ synthesized (ZrB 2 <ce:hsp sp='0.12'/>+<ce:hsp sp='0.12'/>ZrC) hybrid short fibers reinforced Zr matrix composites for nuclear applications显示文摘 | Jia She Yongzhong Zhan Mingjun Pang Chunliu Li Wenchao Yang | 2011 | International Journal of Refractory Metals and Hard Materials2011，，3： | 1 |
| 7 | Analysis of 3D Microtopography in Machined KDP Crystal Surfaces Based on Fractal and Wavelet Methods 显示文摘 | Chen Mingjun Pang Qilong Wang Jinghe | 2008 | International Journal of Machine Tools & Manufacture2008，48，78： | 1 |
| 8 | A modified cross-correlation algorithm for PIV image processing of particle-fluid two-phase flow显示文摘 | Baocheng Shi Jinjia Wei Mingjun Pang | 2015 | Flow Measurement and Instrumentation2015，45，： | 1 |
| 9 | Numerical study on hydrodynamic characteristics of spherical bubble contaminated by surfactants under higher Reynolds numbers显示文摘It is of significance to investigate deeply the hydrodynamic featu res of the bubble co ntaminated by impurities in view of the fact that the industrial liquid is difficult to keep absolutely pure.On the basis of the finite volume method,the bubble interface contaminated by the surfactant(1-pentanol)is achieved through solving the concentration transport equations in liquid and along the bubble interface,and solving the absorption and desorption equation at the bubble interface.And the three-dimensional momentum equation is solved at the same time.It is investigated in detail on the influence of interfacial contamination degrees(described with the cap angleθ)on hydrodynamic characteristics of the spherical bubble when the bubble Reynolds number(Re)is larger than 200.Theθis realized by changing the surfactant concentration(C_(0)) in liquid.The present results show that the hydrodynamic characteristics,such as interfacial concentration,interfacial shear stress,interfacial velocity and wake flow,are related to both Re and C_(0) for the contaminated bubble.When C_(0) is relatively low in liquid(i.e.,the contamination degree of the bubble interface is relatively slight),the hydrodynamic characteristics of the bubble can still keep the 2 D features even if Re>200.The decrease ofθor the increase of Re can promote the appearance of the unsteady wake flow.For the present investigation,when Re>200 andθ≤60°,the hydrodynamic characteristics of the bubble show the 3D phenomena,which indicates that axisymmetric model is no longer valid. | Tao Sun Mingjun Pang Yang Fei | 2022 | Chinese Journal of Chemical Engineering2022，35，5： | 1 |
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