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Cationic starch microparticles with integrated antibacterial and hemostatic performance

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Science China Technological Sciences 2024年第10期67卷 3235-3246页

作者： SU yang NIU MengXin xu KaiDong xu Chen yang PeiLang HU yang xu Fu-jian Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology Ministry of Education)Beijing Laboratory of Biomedical MaterialCollege of Materials Science and EngineeringBeijing University of Chemical Technology Department of Burn Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine

It is urgently demanded to develop biomaterials with balanced hemostatic/antibacterial ability and facile preparation methods. In this work, cationic starch microparticles(MSQP), prepared by the facile grafting of microporous starch particles(MS) with tunable quaternized polyethyleneimine, were readily constructed as promising hemostatic materials for integrated antibacterial and hemostatic performance. The cationic grafts not only endowed MSQP with good antibacterial ability, but also benefited from biocompatible MS to achieve favorable biocompatibility. Moreover, in vitro results confirmed the superior hemostatic property of MSQP2(with the medium content of cationic grafts) among three MSQP and pristine MS. After investigating the bloodmaterial interactions of MSQP/MS, the procoagulant mechanism of MSQP2 was revealed that the optimal amount of cationic grafts achieves highly balanced plasma-protein adhesion, platelet adhesion and blood coagulation system. In vivo artery-injury model further demonstrated the superior hemostatic performance of MSQP2 for potential severe hemorrhage. This work sheds light on the design of cationic polymer-based biomaterials for balanced antibacterial and hemostatic functions.

关键词： hemostasis antibacterial cationic polymer microparticles

基于改进广义S变换时频分析的“板状”断控油藏油柱高度预测

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物探与化探 2024年第3期48卷 768-776页

作者：袁晓满李相文张洁但光箭卢忠沅韩重阳张磊许建洋中国石油集团塔里木油田公司哈得采油气管理区新疆库尔勒841001 中国石油集团东方地球物理勘探有限责任公司研究院新疆库尔勒841000 中油奥博(成都)科技有限责任公司四川成都611730

塔里木盆地北部坳陷碳酸盐岩断控领域油气资源丰富。断控“板状”油藏油水界面的识别是该类油藏效益开发的关键工作。钻井探测油藏油水界面的成本高、工程实现难度大,而采用地球物理的方法识别油水界面是一种高效措施。文章提出一种基... 详细信息

塔里木盆地北部坳陷碳酸盐岩断控领域油气资源丰富。断控“板状”油藏油水界面的识别是该类油藏效益开发的关键工作。钻井探测油藏油水界面的成本高、工程实现难度大,而采用地球物理的方法识别油水界面是一种高效措施。文章提出一种基于广义S变换时频分析的应用方法,通过大量过井地震道时频分析结果与开发动态分析数据联合分析,发现地震资料主频随深度/时间的变化与油层厚度具有正相关关系,提出采用地震道时频道集能量包络异常拐点判别油水界面的思路。实验表明,针对“板状”油藏,当油柱厚度OCH250 m时,油层厚度可靠。应用表明,在富满油田某区某断裂破碎带预测油层厚度主体为200~520 m,与当地开发实际相符,可指导开发实践。

关键词：断裂破碎带断控油藏油层厚度地震探测时频分析塔里木盆地

Influence of Incomplete Soil Plugs on Bearing Capacities of Bucket Foundations in Clay

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China Ocean Engineering 2024年第1期38卷 144-155页

作者： LI Hui-shan LIU Run yang xu LIAN Ji-jian State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Institute of Marine Energy and Intelligent Construction Tianjin University of TechnologyTianjin 300384China

Due to the uneven seabed and heaving of soil during pumping,incomplete soil plugs may occur during the installation of bucket foundations,and the impacts on the bearing capacities of bucket foundations need to be *** this paper,the contact ratio(the ratio of the top diameter of the soil plug to the diameter of the bucket)and the soil plug ratio(the ratio of the soil heave height to the skirt height)are defined to describe the shape and size of the incomplete soil ***,finite element models are established to investigate the bearing capacities of bucket foundations with incomplete soil plugs and the influences of the contact ratios,and the soil plug ratios on the bearing capacities are *** results show that the vertical bearing capacity of bucket foundations in homogeneous soil continuously improves with the increase of the contact ***,in normally consolidated soil,the vertical bearing capacity barely changes when the contact ratio is smaller than 0.75,while the bearing capacity suddenly increases when the contact ratio increases to 1 due to the change of failure *** contact ratio hardly affects the horizontal bearing capacity of bucket ***,the moment bearing capacity improves with the increase of the contact ratio for small aspect ratios,but hardly varies with increasing contact ratio for aspect ratios larger than ***,the reduction coefficient method is proposed based on this analysis to calculate the bearing capacities of bucket foundations considering the influence of incomplete soil *** comparison results show that the proposed reduction coefficient method can be used to evaluate the influences of incomplete soil plug on the bearing capacities of bucket foundations.

关键词： bucket foundation incomplete soil plug uniaxial bearing capacity contact ratio soil plug ratio

A Kinetic Spectrophotometric Method for the Determination of Iron (Ⅲ) in Water Samples

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Journal of Ocean University of China 2008年第2期7卷 161-165页

作者： JI Hongwei xu jian XIN Huizhen yang Xiaoman Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 P. R. China

A new kinetic spectrophotometric method has been developed for the determination of iron （Ⅲ）. The method is based on the catalytic effect of iron （Ⅲ） on the oxidation of weak acid brilliant blue dye （RAWL） by KIO4 in acid medium. The advantages of the proposed method are that it is sensitive, accurate, rapid, inexpensive, can be operated under room temperature and has a large determination concentration range compared to other techniques. The obtained optimum conditions are： pH 3.15, RAWL （200 mgL^-1） 5.00mL, Potassium periodate solution （0.01 molL^-1） 0.30mL, phenanthroline （0.02 molL^-1） 1.00mL, reaction temperature 25℃ and reaction time 7 min. With this method iron could quantitively be determined in the range 0.00-0.02 mgL^-1, the detection limit being 4.10 × 10^10gmL^-1. The relative standard deviations （RSD） in five replicate determinations for 3 μgL^-1and 5 μgL^-1 iron （Ⅲ） are 3.1% and 1.9%, respectively. The method has been applied to the determination of iron （Ⅲ） in tap water samples and seawater samples （from the South China Sea）, the recovery rates being 98.0% and 100.5%, respectively.

关键词： iron kinetic spectrophotometry catalytic effect weak acid brilliant blue dye (RAWL)

Ambarzumyan's Theorem for the Dirac Operator on Equilateral Tree Graphs

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 568-576页

作者： Dong-Jie WU Xin-jian xu Chuan-Fu yang Department of Mathematics School of Mathematics and StatisticsNanjing University of Science and TechnologyNanjing 210094China

The classical Ambarzumyan’s theorem states that if the Neumann eigenvalues of the Sturm-Liouville operator-d^(2)/dx^(2)+q with an integrable real-valued potential q on[0,π] are {n^(2):n≥0},then q=0 for almost all x∈[0,π].In this work,the classical Ambarzumyan’s theorem is extended to the Dirac operator on equilateral tree *** prove that if the spectrum of the Dirac operator on graphs coincides with the unperturbed case,then the potential is identically zero.

关键词： dirac operator quantum graph Ambarzumyan’s theorem inverse spectral problem

Multiparameter Numerical Investigation of Two Types of Moving Interactions Between the Deep-Sea Mining Vehicle Track Plate and Seabed Soil:Digging and Rotating Motions

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China Ocean Engineering 2024年第3期38卷 408-423页

作者： SUN Peng-fei LYU Hai-ning yang jian-min xu Zhi-yong State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Yazhou Bay Institute of Deepsea SCI-TECH Shanghai Jiao Tong UniversitySanya 572024China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai 200240China

To ensure the safe performance of deep-sea mining vehicles(DSMVs),it is necessary to study the mechanical characteristics of the interaction between the seabed soil and the track *** rotation and digging motions of the track plate are important links in the contact between the driving mechanism of the DSMV and seabed *** this study,a numerical simulation is conducted using the coupled Eulerian–Lagrangian(CEL)large deformation numerical method to investigate the interaction between the track plate of the DSMV and the seabed soil under two working conditions:rotating condition and digging ***,a soil numerical model is established based on the elastoplastic mechanical characterization using the basic physical and mechanical properties of the seabed soil obtained by in situ ***,the soil disturbance mechanism and the dynamic mechanical response of the track plate under rotating and digging conditions are obtained through the analysis of the sensitivity of the motion parameters,the grouser structure,the layered soil features and the soil *** results indicate that the above parameters remarkably influence the interaction between the DSMV and the seabed ***,it is important to consider the rotating and digging motion of the DSMV in practical engineering to develop a detailed optimization design of the track plate.

关键词： deep-sea mining vehicle rotating motion digging motion track plate-seabed soil interaction CEL numerical method

Danhongqing formula alleviates cholestatic liver fibrosis by downregulating long non-coding RNA H19 derived from cholangiocytes and inhibiting hepatic stellate cell activation

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Journal of Integrative Medicine 2024年第2期22卷 188-198页

作者： Meng Li yang Zhou Hui Zhu Lie-ming xu jian Ping Institute of Liver Diseases Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 201203China Preventive Treatment Center Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghai 200437 China Department of Gastroenterology Suzhou Traditional Chinese Medicine HospitalSuzhou 215000Jiangsu ProvinceChina Shanghai Key Laboratory of Traditional Chinese Medicine Shanghai 201203China Key Laboratory of Liver and Kidney Diseases(Ministry of Education) Shanghai 201203China

Objective:This study explores the mechanism of action of Danhongqing formula(DHQ),a compoundbased Chinese medicine formula,in the treatment of cholestatic liver ***:In vivo experiments were conducted using 8-week-old multidrug resistance protein 2 knockout(Mdr2-/-)mice as an animal model of cholestatic liver *** was administered orally for 8 weeks,and its impact on cholestatic liver fibrosis was evaluated by assessing liver function,liver histopathology,and the expression of liver fibrosis-related ***-time polymerase chain reaction,Western blot,immunohistochemistry and other methods were used to observe the effects of DHQ on long non-coding RNA H19(H19)and signal transducer and activator of transcription 3(STAT3)phosphorylation in the liver tissue of Mdr2-/-*** addition,cholangiocytes and hepatic stellate cells(HSCs)were cultured in vitro to measure the effects of bile acids on cholangiocyte injury and H19 *** overexpressing H19 were constructed,and a conditioned medium containing H19 was collected to measure its effects on STAT3 protein expression and cell *** intervention effect of DHQ on these processes was also *** overexpressing H19 were constructed to measure the impact of H19 on cell activation and assess the intervention effect of ***:DHQ alleviated liver injury,ductular reaction,and fibrosis in Mdr2-/-mice,and inhibited H19expression,STAT3 expression and STAT3 *** formula also reduced hydrophobic bile acid-induced cholangiocyte injury and the upregulation of H19,inhibited the activation of HSCs induced by cholangiocyte-derived conditioned medium,and decreased the expression of activation markers in *** overexpression of H19 in a human HSC line confirmed that H19 promoted STAT3 phosphorylation and HSC activation,and DHQ was able to successfully inhibit these ***:DHQ effectively alleviated spontaneous cholestatic liver fibrosis in Md

关键词： Liver cirrhosis biliary Long non-coding RNA H19 Danhongqing formula Cholangiocyte Hepatic stellate cells STAT3 transcription factor

Towards the insights into the deactivation behavior of acetylene hydrogenation catalyst

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Petroleum Science 2024年第2期21卷 1405-1414页

作者： Hai-Xia Su yang Jiao jian-Gong Shi Zhi-Wei Yuan Di Zhang xu-Peng Wang Jing Ren Dan Liu jian-Zhou Gui Hai-yang Gao Xiao-Li xu State Key Laboratory of Separation Membranes&Membrane Processes Tianjin Key Laboratory of Green Chemical Technology and Process EngineeringSchool of Material Science and EngineeringTiangong UniversityTianjin300387China Institute of Engineering Technology Sinopec Catalyst Co.LtdBeijing101100China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Green Chemical Technology and Process EngineeringSchool of ChemistryTiangong UniversityTianjin300387China

A series of model catalysts were obtained by treating commercial fresh and spent catalysts unloaded from the factory with different methods, including green oil dipping, extraction and high-temperature regeneration;finally, the deactivation behavior of the commercial catalyst for acetylene hydrogenation were studied. The influence of various possible deactivation factors on the catalytic performance was elucidated via detailed structural characterization, surface composition analysis, and activity *** results showed that green oil, carbon deposit and sintering of active metal were the main reasons for deactivation, among which green oil and carbon deposit led to rapid deactivation, while the activity could be recovered after regeneration by high-temperature calcination. The sintering of active metal components was attributed to the high-temperature regeneration in hydrothermal conditions, which was slow but irreversible and accounted for permanent deactivation. Thus, optimizing the regeneration is expected to extend the service life of the commercial catalyst.

关键词： Acetylene Hydrogenation Green oil Carbon deposit Sintering Catalyst deactivation

Engineered biochar improves nitrogen use efficiency via stabilizing soil water-stable macroaggregates and enhancing nitrogen transformation

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Biochar 2023年第1期5卷 891-927页

作者： Zaid Khan xu-jian yang Youqiang Fu Stephen Joseph Mohammad Nauman Khan Muhammad Ayoub Khan Intikhab Alam Hong Shen College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510640China Rice Research Institute Guangdong Academy of Agricultural SciencesGuangzhou 510640China School of Material Science and Engineering University of New South WalesSydneyNSW 2052Australia Research Center for Physiology and Ecology and Green Cultivation of Tropical Crops College of Tropical CropsHainan UniversityHaikou 570228China School of Life Sciences Henan UniversityKaifeng 450046China College of Life Sciences South China Agricultural UniversityGuangzhou 510640China

The use of inorganic nitrogen(N)fertilizers has increased drastically to meet the food requirements of the world’s growing ***,the excessive use of chemical nitrogen fertilizer has caused a series of soil and environmental problems,such as soil hardening,lower nitrogen use efficiency(NUE),nitrate pollution of water sources,nitrous oxide emissions,*** this review,we aimed to elaborate and discuss the role of engineered biochar in inducing the stability of water-stable macroaggregates,improving inorganic N transformation,and utilization efficiency to address the current uncertainties of nitrogen loss and maintaining soil and water ***,we elucidated the characteristics of engineered biochar in improving biochar quality to work as a multifunctional player in the ecosystem and promote resource utilization,soil conservation,and ecosystem ***,we discussed how the engineered biochar modulates the stability of water-stable macroaggregates and soil inorganic nitrogen transformation to enhance plant response under various toxic or deficient nitrogen conditions in the ***,the role of engineered biochar in biological nitrogen fixation,mediating nirK,nirS,and nosZ genes to promote the conversion of N_(2)O to N_(2),and decreasing denitrification and N_(2)O emission was ***,we suggest that engineered biochar amendment to soil can regulate soil water-stable macroaggregates,reduce N input,improve nitrogen metabolism,and finally,NUE and crop *** the best of our knowledge,this is the first time to evaluate the combined interactions of"engineered biochar×soil×NUE×crop growth,"providing advantages over the increasing N and water utilization and crop productivity separately with the aim of enhancing the stability of water-stable macroaggregates and NUE together on a sustainable basis.

关键词： Nitrogen Engineered biochar Macroaggregates Multifunctional player Nitrogen use efficiency