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Hegang Ren,김일,Min Yang,Baojun Zhang,Xiaofei Ren,Binyuan Liu,Yanji Wang 한국고분자학회 2012 Macromolecular Research Vol.20 No.9
1-Butene polymerizations were carried out by using a MgCl2/TiCl4/ID-AlR3/ED catalyst system in n-hexane,therein the internal donor (ID) is diisobutyl phthalate (DIBP), the external donor (ED) is diphenyl dimethoxysilane (DDS) or cyclohexyl methyl dimethoxysilane (CHMMS), and the AlR3 activator is AlEt3 or Al(i-Bu)3. The effect of the molar ratio of DIBP/Mg and polymerization conditions on the catalytic activity and the isotactic index (II) of poly(1-butene) (PB) was investigated. The dosage of DIBP remarkably improved the catalytic activity and the II of PB. CHMMS was more effective than DDS for increasing the II of PB. The addition of a small amount of hydrogen enhanced the catalytic activity from 15.1 to 17.5 kg-PB·gTi-1 and the II value of PB from 89.3% to 95.1%. The mixture of AlR3 was beneficial to increase the catalytic activity with negligible effect on the isospecificity.
Progress on reproductive modes of sarcosaphagous flies
Yang Li,Ren Lipin,Shang Yanjie,Zhang Changquan 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
The reproduction strategies of invertebrates, oviparity, ovoviviparity and viviparity, always reflect the rela tionship between individuals and their surroundings. There is plasticity in the reproductive strategies of sarco saphagous flies as they adjust to rapidly changing circumstances. The transition from oviparity to ovoviviparity or viviparity involves numerous changes in physiology, morphology and immunology. Demonstrating these processes can make the application of entomology work in forensic practice more reliable. This essay reviews means of reproduction in sarcosaphagous flies and identifies related features. It is shown that not only the reproduction traits, such as fast location of carrion, and uncommon number of ovaries and oogenesis, but also some morphological features are related to viviparity. In general, viviparous flies have larger adult bodies but smaller eggs and chorions. Moreover, the length of terminalia and the shape of the vagina also varies among those three modes. Reproductive plasticity is a bridge between the three reproductive modes, and it can greatly influence the inference of the post-mortem interval (PMImin).
Co‑doped amorphous MoSx for efficient hydrogen evolution reaction in acid condition
Lang Gan,Jincheng Liu,Yanjie Ren,Zhongyi Xiong,Kang Chen 한국탄소학회 2023 Carbon Letters Vol.33 No.5
Amorphous molybdenum sulfide ( MoSx) has been regarded as a promising hydrogen evolution reaction (HER) catalyst due to its mild preparation conditions and low-cost precursor materials. In this work, we report a simple strategy combining the growth of amorphous MoSx on the surface of metal organic frameworks (ZIF-67) and annealing treatment to prepare Co-doped MoSx nanopolyhedrons (denoted as CoMoSx NPs). The CoMoSx NPs exhibit excellent HER activity in acid condition with an overpotential of 188 mV at a current density of 10 mA cm? 2 (η10), and a relatively stable overpotential after 2000 cyclic voltammetry (CV) cycles testing. The excellent HER performance of the CoMoSx NPs can be attributed to the doping of Co element adjust the electronic structure and increase the conductivity of catalyst, and the nanopolyhedrons structure which can expose more active sites for HER electrocatalytic. This study offers a low-cost and simple strategy to prepare high-activity HER catalyst, which holds great promises in developing advanced electrocatalysts for energy storage.