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Engineering surface framework TiO6 single sites for unprecedented deep oxidative desulfurization

National Science Review 2024年第5期11卷 303-314页

作者： Shen Yu Zhan liu Jia-Min Lyu Chun-Mu Guo Xiao-Yu Yang Peng Jiang Yi-Long Wang Zhi-Yi Hu Ming-Hui Sun Yu li li-hua chen Bao-lian Su Laboratory of living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Nanostructure Research Center Wuhan University of Technology School of Chemistry Chemical Engineering and Life ScienceWuhan University of Technology Laboratory of Inorganic Materials Chemistry University of Namur

Catalytic oxidative desulfurization（ODS） using titanium silicate catalysts has emerged as an efficient technique for the complete removal of organosulfur compounds from automotive fuels. However, the precise control of highly accessible and stable-framework Ti active sites remains highly challenging. Here we reveal for the first time by using density functional theory calculations that framework hexa-coordinated Ti（TiO6） species of mesoporous titanium silicates are the most active sites for ODS and lead to a lower-energy pathway of ODS. A novel method to achieve highly accessible and homogeneously distributed framework TiO6active single sites at the mesoporous surface has been developed. Such surface framework TiO6species exhibit an exceptional ODS performance. A removal of 920 ppm of benzothiophene is achieved at60°C in 60 min, which is 1.67 times that of the best catalyst reported so far. For bulky molecules such as4,6-dimethyldibenzothiophene（DMDBT）, it takes only 3 min to remove 500 ppm of DMDBT at 60°C with our catalyst, which is five times faster than that with the current best catalyst. Such a catalyst can be easily upscaled and could be used for concrete industrial application in the ODS of bulky organosulfur compounds with minimized energy consumption and high reaction efficiency.

关键词： electrostatic interactions framework hexa-coordinated Ti site oxidative desulfurization mesoporous materials self-assembly

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Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the China Jinping underground laboratory(CJPL)

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Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji chen Hao Zhang li‑Yong Zhang Jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue li Jian‑Guo Wang Long Zhang Fu‑Qiang Cao Zhi‑cheng Zhang Xin‑Zhi Jiang Luo‑huan Wang Zi‑Ming li Lu‑Yang Song liang‑Ting Sun Qi Wu Jia‑Qing li Bao‑Qun Cui li‑hua chen Rui‑Gang Ma Er‑Tao li Gang lian Yao‑De Sheng Zhi‑Hong li Bing Guo Wei‑Ping liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atomic Energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the China Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA

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延长合规不起诉考察期限的实践检视与进路

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四川警察学院学报 2024年第2期36卷 94-101页

作者：李华晨中国人民公安大学法学院

根据现行《刑事诉讼法》规定的办案期限，检察机关适用企业合规不起诉模式面临着难以为大型涉案企业设置合理合规考察期的问题。对此，试点地区检察机关只能依据法定侦查和取保候审的期限设计延长合规考察时间的方案，但事实证明这样的... 详细信息

根据现行《刑事诉讼法》规定的办案期限，检察机关适用企业合规不起诉模式面临着难以为大型涉案企业设置合理合规考察期的问题。对此，试点地区检察机关只能依据法定侦查和取保候审的期限设计延长合规考察时间的方案，但事实证明这样的方案无法满足大型涉案企业合规整改的合理期待。因此，合规不起诉考察期限的设计应当同时满足大型和小微型涉案企业的合规考察需要，根据不同情况将考察期限设置为6个月以上3年以下的弹性期间。

关键词：合规不起诉合规考察考察期限合规计划

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The future of carbon neutrality from a scientific research perspective:an interview with Jing-Hai li

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National Science Review 2023年第9期10卷 110-112页

作者： li-hua chen Wuhan University of Technology

Since China announced that it will strive to achieve carbon peak by 2030 and carbon neutrality by 2060, it has become the focus of the whole *** implementation of carbon peaking and carbon neutrality goals requires a range of revolutionary technologies and involves an array of key scientific questions.A great deal of research has focused on the development of new concepts and innovative technologies on carbon science and sustainable development.

关键词： Carbon

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Hierarchically porous materials and green carbon science——an interview with Ming-Yuan He

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National Science Review 2020年第11期7卷 1759-1761页

作者： li-hua chen Wuhan University of Technology

Many examples of hierarchies are present in nature, such as water transport in leaf vein systems, the respiratory system, the blood circulatory system, etc. Hierarchically structuring a material over different length scales by mimicking natural systems can provide an opportunity to render the material suitable for a variety of functions.

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Improvement of the Specificity of Surface Plasmon Resonance with BSA-modified Chip

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Chinese Chemical Letters 2006年第12期17卷 1619-1622页

作者： li hua chen College of chemistry and molecular engineer Qingdao University of Science and Technology Qingdao 266042

A chip was modified with bovine serum albumin （BSA）, then interaction between glutathione （GSH） immobilized on the top of BSA and glutathione-S-transferase （GST） was examined, using surface plasmon resonance （SPR）. The SPR results showed that BSA-modified chip was effective not only in binding the target proteins but also in suppressing the nonspecific binding （NSB） of proteins.

关键词： Surface plasmon resonance (SPR) bovine serum albumin (BSA) glutathione (GSH),glutathione-S-trans ferase (GST).

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Positive Solution of Singularly Perturbed Dirichlet Problem with Singularities

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Acta Mathematicae Applicatae Sinica 2014年第3期30卷 611-616页

作者： li-hua chen Jia-qi MO Department of Mathematics and Computer Science Fuqing Branch of Fujian Normal University Anhui Normal University Faculty of Science Huzhou Teacher College

A class of singularly perturbed boundary value problem with singularities is considered. Introducing the stretched variables, the boundary layer corrective terms near x = 0 and x = 1 are constructed. Under suitable conditions, by using the theory of differential inequalities the existence and asymptotic behavior of solution for boundary value problem are proved, uniformly valid asymptotic expansion of solution with boundary layers are obtained,

关键词： nonlinear singular equation singular perturbation boundary value problem

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Formation of macroporous gel morphology by phase separation in the silica sol-gel system containing nonionic surfactant

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Journal of University of Science and Technology Beijing 2005年第6期12卷 564-571页

作者： Junsheng Wu Xiaogang li Wei Du hua chen Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

The phase separation and gel formation behavior in an alkoxy-derived silica sol-gel system containing C16EO15 has been investigated. Various gel morphologies similar to other sol-gel systems containing organic additives were obtained by changing the preparation conditions. Micrometer-range interconnected porous gels were obtained by freezing transitional structures of phase separation in the sol-gel process. The dependence of the resulting gel morphology on several important reaction parameters such as the starting composition, reaction temperature and acid catalyst concentration was studied in detail. The experimental results indicate that the gel morphology is mainly determined by the time relation between the onset of phase separation and gel formation.

关键词： silica sol-gel phase separation macroporous gel morphology nonionic surfactant

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Idiopathic sclerosing encapsulating peritonitis (or abdominal cocoon):A report of 5 cases

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World Journal of Gastroenterology 2007年第26期13卷 3649-3651页

作者： Ping Xu li-hua chen You-Ming li Department of Gastroenterology First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 Zhejiang Province China

Sclerosing encapsulating peritonitis (SEP) is a rare cause of intestinal obstruction that is characterized by a thick grayish-white fibrotic membrane encasing the small bowel. SEP can be classified as idiopathic,also known as abdominal cocoon,or secondary. It is difficult to make a definite pre-operative diagnosis. We experienced five cases of abdominal cocoon,and the case files were reviewed retrospectively for the clinical presentation,operative findings and outcome. All the patients presented with acute,subacute and chronic intestinal obstruction. Computed tomography (CT) showed characteristic findings of small bowel loops congregated to the center of the abdomen encased by a soft-tissue density mantle in four cases. Four cases had an uneventful post-operative period,one case received second adhesiolysis due to persistent ileus. The imaging techniques may facilitate pre-operative diagnosis. Surgery is important in the management of SEP.

关键词： Sclerosing encapsulating peritonitis Idiopathic Abdominal cocoon Intestinal obstruction Adhesiolysis

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Theoretical Studies on the Iodine-catalyzed Nucleophilic Addition of Acetone with Five-membered Heterocycles

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Chemical Research in Chinese Universities 2008年第4期24卷 520-524页

作者： WANG Yan-hua li li chen Xue-song College of Biology and Environment Engineering Zhejiang Shuren University Hangzhou 310015 P. R. China

The iodine-catalyzed nucleophilic addition reactions of pyrrole, furan, or thiophene with acetone were studied in gas and solvent by the density functional theory at the level of Lanl2DZ^＊. It was seen that the halogen bond between iodine and carbonyl oxygen appeared to have an important catalytic effect on such reactions, and the first iodine molecule maximally diminished the barrier height by 41 kJ/mol, while the second iodine molecule could not improve such reactions largely. It was concluded that the C2-addition was generally more favorable than the C3-addition for the three heterocycles; however, iodine considerably more effectively catalyzed the C3-addition than the C2-addition for pyrrole. It was also revealed by PCM calculation that the iodine-catalyzed nucleophilic additions occurred more easily in solvent than in gas, which explained the experiment performed by Bandgar et al..

关键词： Halogen bond, Catalytic effect Nucleophilic addition Density functional theory

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