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Ce-promoted Mn/ZSM-5 catalysts for highly efficient decomposition of ozone

Journal of Environmental Sciences 2021年第5期33卷 219-228页

作者： Linlin wei Hongxia Chen ying wei Jingbo Jia Runduo Zhang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical TechnologyBeijing 100029PR China

Manganese oxides supported by ZSM-5 zeolite(Mn/ZSM-5) as well as their further modified by Ce promoter were achieved by simple impregnation method for ozone catalytic decomposition. The yCe20Mn/ZSM-5–81 catalyst with 8% Ce loading showed the highest catalytic activity at relative humidity of 50% and a space velocity of 360 L/(g × hr), giving 93% conversion of 600 ppm O_(3) after 5 hr. Moreover, this sample still maintained highly activity and stability in humid air with 50%–70% relative humidity. Series of physicochemical characterization including X-ray diffraction, temperature-programmed technology(NH_3-TPD and H_(2)-TPR), X-ray photoelectron spectroscopy and oxygen isotopic exchange were introduced to disclose the structure-performance relationship. The results indicated that moderate Si/Al ratio(81) of zeolite support was beneficial for ozone decomposition owing to the synergies of acidity and hydrophobicity. Furthermore, compared with 20 Mn/ZSM-5-81, Ce doping could enhance the amount of low valance manganese(such as Mn^(2+) and Mn^(3+)). Besides, the Ce^(3+)/Ce^(4+) ratio of 8Ce20Mn/ZSM-5-81 sample was higher than that of 4Ce_(2)0 Mn/ZSM-5-81. Additionally, the synergy between the MnO_x and CeO_(2) could easily transfer electron via the redox cycle, thus resulting in an increased reducibility at low temperatures and high concentration of surface oxygen. This study provides important insights to the utilization of porous zeolite with high surface area to disperse active component of manganese for ozone decomposition.

关键词： Manganese oxide ZSM-5 zeolite Ce promoter Adsorbed oxygen Ozone decomposition

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Effect of Carboxymethyl Cellulose(CMC) Functionalization on Dispersion, Mechanical, and Corrosion Properties of CNT/Epoxy Nanocomposites

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Chinese Journal of Polymer Science 2023年第8期41卷 1277-1286,I0010页

作者： Da-wei Zhang Leonard Chia ying Huang Department of Civil Construction and Environmental EngineeringNorth Dakota State UniversityFargo 58108USA

Carbon nanotube(CNT)/epoxy nanocomposites have a great potential of possessing many advanced ***,the homogenization of CNT dispersion is still a great challenge in the research field of *** study applied a novel dispersion agent,carboxymethyl cellulose(CMC),to functionalize CNTs and improve CNT dispersion in *** effectiveness of the CMC functionalization was compared with mechanical mixing and a commonly used surfactant,sodium dodecylbenzene sulfonate(Na DDBS),regarding dispersion,mechanical and corrosion properties of CNT/epoxy nanocomposites with three different CNT concentrations(0.1%,0.3%and 0.5%).The experimental results of Raman spectroscopy,particle size analysis and transmission electron microscopy showed that CMC functionalized CNTs reduced CNT cluster sizes more efficiently than Na DDBS functionalized and mechanically mixed CNTs,indicating a better CNT *** peak particle size of CMC functionalized CNTs reduced as much as 54%(0.1%CNT concentration)and 16%(0.3%CNT concentration),compared to mechanical mixed and Na DDBS functionalized *** of the better dispersion,it was found by compressive tests that CNT/epoxy nanocomposites with CMC functionalization resulted in 189%and 66%higher compressive strength,224%and 50%higher modulus of elasticity than those with mechanical mixing and Na DDBS functionalization respectively(0.1%CNT cencentration).In addition,electrochemical corrosion tests also showed that CNT/epoxy nanocomposites with CMC functionalization achieved lowest corrosion rate(0.214 mpy),the highest corrosion resistance(201.031Ω·cm^(2)),and the lowest porosity density(0.011%).

关键词： CNT/epoxy composites Carboxymethyl cellulose Dispersion Mechanical properties Corrosion properties

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An efficient and balanced feature pyramid network: shared-FPN

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Optoelectronics Letters 2025年

作者： Tian Sulong Qin Longfei Pang Wenchao Gao ying Zhao Dexin School of Computer Science and Engineering， Tianjin University of Technology Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology， Tianjin University of Technology

In the field of object detection， it is challenging to achieve a balance between neck complexity and accuracy. To address this issue， we propose an efficient and decoupled neck module called Shared-FPN(Shared Feature Pyramid Network). Our design aims to effectively address the trade-off between these two factors. Neck modules are crucial for effectively fusing multi-scale information in neural network models. However， traditional neck designs， with their single structure， have struggled to significantly improve detection performance. In recent years， the incorporation of neural architecture search techniques in neck design has led to an increase in model complexity. This trade-off between model complexity and detection performance highlights the need for more efficient neck design approaches. Not only does Shared-FPN not increase the number of model parameters and FLOPs， but it also can be easily ported to any of the detection models. It improves on PAFPN by using transposed convolution with a large convolution kernel as the upsampling module， designing spatial pyramidal pooling-fast downsampling(SPPFD) based on shared pooling， and designing shared convolution as the right part module. To evaluate the performance of Shared-FPN in object detection tasks， we conducted experiments on object detection datasets. The results show that Shared-FPN achieved excellent performance across all sizes. In particular， on the VOC 2012 dataset， which contains mostly large objects， Shared-FPN's mAP was improved by 11.2% compared to FPN with YOLOX-s as the detector. On the COCO dataset， which contains mostly small objects， Shared-FPN's mAP was improved by 7.8% compared to FPN and 7.1% compared to PAFPN with Faster RCNN as the detector. Shared-FPN can be easily inserted into any of the detectors for better performance in various scenarios， such as small， medium or large objects.

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Applications of pillarenes, an emerging class of synthetic macrocycles

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Science China Chemistry 2014年第9期57卷 1185-1198页

作者： SONG Nan Yang ying-wei State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin University

Synthetic macrocycles, a typical type of building block for molecular recognition and self-assembly, are crucial to supramolecular chemistry and materials science. Since 2008, a new generation of synthetic macrocyclic hosts, pillarenes and their abundant derivatives, which consist of hydroquinone units linked by methylene bridges at 2,5-positions, have been the focus of much research. Numerous studies on their host-guest properties and the fabrication of supramolecular assemblies have demon- strated that pillarenes and their derivatives possess many advantages that facilitate their applications in many research fields. Herein we summarize and classitfy the applications of pillarenes in terms of artificial transmembrane channels, controlled delivery systems, dispersion of carbon hybrid materials, extraction and absorption, liquid crystals, metal-organic frameworks, sensing and detection, stabilization of nanoparticles （Au/Ag/CdTe）, and other typical biological applications. We also provide an overview of future developments in pillarene chemistry.

关键词： drug delivery host-guest interactions macrocycles pillarenes supramolecular materials

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Gold nanoparticles functionalized with supramolecular macrocycles

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Chinese Chemical Letters 2013年第7期24卷 545-552页

作者： Hui Li ying-wei Yang State Key Laboratory of Supramolecular Structure and Materials College of Chemistry.Jilin University

Gold nanoparticles （AuNPs） functionalized with supramolecular macrocycles are versatile and diverse hybrid nanomaterials, which combine and enhance the characteristics of the two components. In this mini-review, we summarize the recent research progress on the synthesis and assembly of AuNPs functionalized with different supramolecular macrocyclic compounds, i.e., crown ethers, cyclophanes, cyclodextrins （CDs）, cucurbit[n]urils （CB[n]）, calix[n]arenes, and pillar[n]arenes （PIn]A）. Meanwhile, applications of these supramolecular hybrid nanomaterials in the fields of sensors, biomedicine and plasmonic devices are also presented.

关键词： Supramolecular macrocycles Au nanoparticles Synthesis Assembly Nanomaterials

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Optimality conditions and duality for a class of nondifferentiable multiobjective generalized fractional programming problems

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Applied Mathematics(A Journal of Chinese Universities) 2008年第3期23卷 331-344页

作者： GAO ying RONG wei-dong School of Mathematical Sciences Inner Mongolia University Hohhot 010021 China

This paper studies a class of multiobjective generalized fractional programming problems, where the numerators of objective functions are the sum of differentiable function and convex function, while the denominators are the difference of differentiable function and convex function. Under the assumption of Calmness Constraint Qualification the Kuhn-Tucker type necessary conditions for efficient solution are given, and the Kuhn-Tucker type sufficient conditions for efficient solution are presented under the assumptions of （F, α, ρ, d）-V-convexity. Subsequently, the optimality conditions for two kinds of duality models are formulated and duality theorems are proved.

关键词： operations research multiobjective generalized fractional programming optimality condition duality theorem generalized convexity

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Inhibition of Eukaryotic Initiating Factor eIF4E Overcomes Abemaciclib Resistance in Gastric Cancer

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Current Medical Science 2023年第5期43卷 927-934页

作者： Huo-long ZHA wei CHEN wei SHI ying-ying LIAO Department of Gastroenterology Renmin HospitalHubei University of MedicineShiyan 442000China Department of Critical Care Medicine Taihe HospitalHubei University of MedicineShiyan 442000China

Objective Aberrant activating mutations in cyclin-dependent kinases 4 and 6(CDK4/6)are common in various cancers,including gastroesophageal *** CDK4/6 inhibitors,such as abemaciclib and palbociclib,have been approved for breast cancer treatment,their effectiveness as a monotherapy remains limited for gastroesophageal *** present study explored the underlying mechanism of abemaciclib *** Abemaciclib-resistant gastric cancer cell lines were generated,and the phospho-eukaryotic translation initiation factor 4E(p-eIF4E)and eIF4E expression was compared between resistant and parental cell *** order to analyze the role of eIF4E in cell resistance,siRNA knockdown was *** effectiveness of ribavirin alone and its combination with abemaciclib was evaluated in the gastric cancer xenograft mouse *** The upregulation of eIF4E was a common feature in gastric cancer cells exposed to prolonged abemaciclib *** cancer cells with increased eIF4E levels exhibited a better response to eIF4E inhibition,especially those that were resistant to ***,which is an approved anti-viral drug,significantly improved the efficacy of abemaciclib,both in vitro and in vivo,by inhibiting ***,ribavirin effectively suppressed the abemaciclib-resistant gastric cancer growth in mice without causing *** These findings suggest that targeting eIF4E can enhance the abemaciclib treatment for gastric cancer,proposing the potential combination therapy of CDK4/6 inhibitors with ribavirin for advanced gastric cancer.

关键词： eIF4E CDK4/6 ribavirin gastric cancer resistance

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Unique biogenesis and kinetics of hornwort Rubiscos revealed by synthetic biology systems

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Molecular Plant 2024年第12期17卷 1833-1849页

作者： Zhen Guo Oh Tanner Ashton Robison Dan Hong Loh Warren Shou Leong ang Jediael Zheng ying Ng Fay-wei Li Laura Helen Gunn School of Integrative Plant Science Cornell UniversityIthacaNY 14853USA Boyce Thompson Institute IthacaNY 14853USA Max Planck Institute for Terrestrial Microbiology 35043 MarburgGermany Department of Cell and Molecular Biology Uppsala University75124 UppsalaSweden

Hornworts are the only land plants that employ a pyrenoid to optimize Rubisco’s CO_(2) fixation,yet hornwort Rubisco remains poorly *** we assembled the hornwort Anthoceros agrestis Rubisco(AaRubisco)using the Arabidopsis thaliana SynBio expression system and observed the formation of stalled intermediates,prompting us to develop a new SynBio system with *** cognate *** successfully assembled AaRubisco and Rubisco from three other hornwort *** *** Rubisco,AaRubisco assembly is not dependent on RbcX or *** characterization reveals that hornwort Rubiscos exhibit a range of catalytic rates(3–10 s−1),but with similar affinity(∼30μM)and specificity(∼70)for CO_(2).These results suggest that hornwort Rubiscos do not comply with the long-held canonical catalytic trade-off observed in other land plants,providing experimental support that Rubisco kinetics may be phylogenetically ***,we observed a 50%increase in AaRubisco catalytic rates when RbcX was removed from our SynBio system,without any reduction in *** biology,biochemistry,and proteomic analysis suggest that subtle differences in Rubisco large-subunit interactions,when RbcX is absent during biogenesis,increases the accessibility of active sites and catalytic turnover ***,this study uncovered a previously unknown Rubisco kinetic parameter space and provides a SynBio chassis to expand the survey of other Rubisco *** discoveries will contribute to developing new approaches for engineering Rubisco with superior kinetics.

关键词： hornworts CO_(2)fixation Rubisco synthetic biology structural biology assembly factors

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Functional Proteomics Driven by Chemical and Computational Approaches

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Chinese Journal of Chemistry 2022年第5期40卷 628-634页

作者： ying Chen wei Qin Chu Wang College of Chemistry and Molecular Engineering Peking UniversityBeijing100871 China Peking-Tsinghua Center for Life Science Peking UniversityBeijing100871 China Beijing National Laboratory for Molecular Sciences Peking UniversityBeijing100871 China Synthetic and Functional Biomolecules Center Peking UniversityBeijing100871 China Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Peking UniversityBeijing100871 China

Functional proteomics is a powerful approach to globally investigate protein functions and their biological ***-based protein profiling(ABPP)has been widely applied to explore the activity and ligandability of proteins in complex biological ***,we summarized our efforts in developing chemical probes and chemical proteomic pipelines to identify protein targets of certain post-translational modifications(PTMs),covalent drugs,natural products and cellular ***,computer-aided proteomic strategies were developed to globally identify functional residues including hyper-reactive cysteines,active sites of selenoproteins and proximal anchors for protein activation.

关键词： Activity-based protein profiling Proteomics Protein modifications Protein design Target deconwolution

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Turán Number of the Family Consisting of a Blow-up of a Cycle and a Blow-up of a Star

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Acta Mathematica Sinica,English Series 2023年第10期39卷 1980-1988页

作者： Zhi wei WU Li ying Kang Department of Mathematics Shanghai UniversityShanghai 200444P.R.China

Let F={H_(1),...,H_(k)}(k≥1)be a family of *** Tur´an number of the family F is the maximum number of edges in an n-vertex{H_(1),...,H_(k)}-free graph,denoted by ex(n,F)or ex(n,{H_(1),H_(2),...,H_(k)}).The blow-up of a graph H is the graph obtained from H by replacing each edge in H by a clique of the same size where the new vertices of the cliques are all *** this paper we determine the Tur´an number of the family consisting of a blow-up of a cycle and a blow-up of a star in terms of the Tur´an number of the family consisting of a cycle,a star and linear forests with k edges.

关键词： Tur´an number extremal graph blow-up cycle star

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