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International Journal of Biomathematics 2024年第1期17卷 199-225页

作者： Yuxuan Tang shuling shen Linhe Zhu School of Mathematical Sciences Jiangsu University Zhenjiang212013P.R.China Department of Stomatology Afiliated Hospital of Jiangsu University Zhenjiang 210008P.R.China

The study of rumor propagation dynamics is of great significance to *** news and ensure the authenticity of news *** this paper,a SI reaction-diffusion rumor propagation model with nonlinear saturation incidence is ***,through stability analysis,we obtain the conditions for the existence and local stability of the positive equilibrium *** selecting suitable variable as the control parameter,the critical value of Turing bifurcation and the existence theorem of Turing bifurcation are ***,using the above theorem and multi-scale standard analysis,the expression of amplitude equation around Turing bifurcation point is *** analyzing the amplitude equation,different types of Turing pattern are divided such as uniform steady-state mode,hexagonal mode,stripe mode and mixed structure ***,in the numerical simulation part,by observing different patterns corresponding to different values of control variable,the correctness of the theory is ***,the effects of different network structures on patterns are *** results show that there are significant differences in the distribution of users on different network structures.

关键词： Reaction-diffusion system rumor propagation amplitude equation Turing pattern

Surface structural transformation of Ni2P@C electrocatalysts for overall alkaline water splitting

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Progress in Natural Science:Materials International 2024年第1期34卷 102-107页

作者： Kun Yang Xinjuan Liu Jun Xu Yun Gong shuling shen Jinchen Fan Xiaojie Zhang Yuhua Xue School of Materials and Chemistry University of Shanghai for Science and Technology National&Local Joint Engineering Research Center for Mineral Salt Deep Utilization Huaiyin Institute of Technology

Understanding the surface restructuring, including atomic rearrangement and chemical composition adjustments,is urgent to accelerate electrocatalytic reactions. Herein, we focus on the surface restructuring and active species for phosphide especially Ni2P during the water splitting process by combination of in-situ Raman and ex-situ X-ray photoelectron spectroscopy. Results confirm that NiOOH and NiOO* are formed during OER, while Niδ+-Hadactive sites are formed during HER. In situ-formed NiOOH/Ni2P@C and Niδ+/Ni2P@C show enhanced water splitting（1.514 V at 10 mA/cm2） and NO3RR(86% and 668 μmol h-1cm-2for NH3Faraday efficiency and yield)activities. In-depth investigation of the surface dynamic changes can provide guidance for establishing the relation of structure-electrocatalytic activity.

关键词： Dynamic surface restructuring Phase structural transition In-situ Raman spectra Ni_2P@C Overall water splitting

声热联合杀菌对NFC橙汁低温贮藏营养和感官品质的影响

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农业工程学报 2024年第14期40卷 261-270页

作者：王越林鑫勰尹立来朱玉燕沈淑铃郑小林浙江工商大学食品与生物工程学院杭州310008 德清秋水果汁有限公司湖州313216

为了探究声热联合杀菌(thermosonication,TS)对非浓缩还原(not from concentrate,NFC)橙汁品质的影响,研究比较了传统巴氏杀菌(70℃,15 min)和TS(600 W,60℃,13 min)对贮藏期间NFC橙汁的微生物、色泽、柠檬苦素、诺米林、维生素C(vitami... 详细信息

为了探究声热联合杀菌(thermosonication,TS)对非浓缩还原(not from concentrate,NFC)橙汁品质的影响,研究比较了传统巴氏杀菌(70℃,15 min)和TS(600 W,60℃,13 min)对贮藏期间NFC橙汁的微生物、色泽、柠檬苦素、诺米林、维生素C(vitamin C,Vc)、总酚、总黄酮含量,以及抗氧化活性的影响,并采用GC-MS分析评价2种杀菌方式对NFC橙汁风味的影响。结果表明,在贮藏期间,2种杀菌方式下NFC橙汁中菌落总数以及霉菌和酵母菌均符合国家标准,糖酸成分稳定,TS处理不影响NFC橙汁的酸甜口感。与传统巴氏杀菌处理NFC橙汁相比,TS处理提高了NFC橙汁的浊度稳定性和色泽,褐变指数降低了12.50%~16.67%,Vc的损失率减少了10.52%,总酚和总黄酮含量是传统巴氏杀菌组的1.00~1.06倍,柠檬苦素含量和诺米林含量分别降低了17.37%~56.62%和9.32%~63.85%,DPPH自由基清除能力和铁离子还原能力分别是巴氏杀菌的1.09~1.21倍和1.11~1.70倍。通过GC-MS分析共鉴定出49种挥发性风味物质。NFC橙汁经传统巴氏杀菌处理后产生1-辛烯-3-醇、2-辛炔-1-醇、丁酸乙酯、反-2-辛烯醛、反-2-壬烯醛、反-2-庚烯醛、水芹醛、6-甲基-5-庚烯-2-酮以及丁酸9种挥发性成分,导致NFC橙汁产生热异味;而TS处理能够有效抑制NFC橙汁产生这些成分,从而避免NFC橙汁产生热异味。因此,声热联合杀菌是一种优于或可代替NFC橙汁传统巴氏杀菌的杀菌方式,该研究为声热联合杀菌技术在NFC橙汁的应用提供理论依据和技术参数。

关键词：温度巴氏杀菌品质 NFC橙汁声热联合杀菌挥发性成分

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Synthesis of nano-CaCO_3 composite particles and their application

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Journal of University of Science and Technology Beijing 2008年第1期15卷 67-73页

作者： Wei Wu Xueqin Zhang Jianfeng Chen shuling shen Key Lab of the Ministry of Education of China for Nanomaterials Beijing University of Chemical Technology Beijing 100029 China Research Center of the Ministry of Education of China for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing 100029 China

Nano-calcium carbonate composite particles were synthesized by the soapless emulsion polymerization technique of double monomers. The composite particles formation mechanism was investigated. The effects of composite particles on the mechanical properties of nano-CaCO3-ABS （acrylonitrile-butadiene-styrene copolymer） composite material were studied. It was validated that the composite particles are made up of the nano-calcium carbonate cores and the shells of alternating copolymers of butyl acrylate （BA） and styrene （St）. The shells are chemically grafted and physically wrapped on the surface of nano-calcium carbonate particles. When the composite particles were filled in ABS matrix, the CaCO3 particles are homogeneously dispersed in the composite material as nanoscales. The impact strength of the composite material is obviously enhanced after filling appropriate amounts of composite particles. It can be concluded that the soapless emulsion polymerization of double monomers is an effective method for nano-CaCO3 surface treatment. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： nano-calcium carbonate composite particles soapless emulsion polymerization composite material mechanical properties mechanism

Low-cost preparation of mesoporous silica with high pore volume

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Journal of University of Science and Technology Beijing 2007年第4期14卷 369-372页

作者： shuling shen Wei Wu Kai Guo Jianfeng Chen Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing China Key Laboratory of the Ministry of Education for Nanomaterials Beijing University of Chemical Technology Beijing 100029 China

Mesoporous silica materials with high pore volume were successfully prepared by the chemical precipitation method, with water glass and a biodegradable nonionic surfactant polyethylene glycol （PEG）. The obtained materials were characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, thermo gravimetric analyzer and differential scanning calorimetry （TG-DSC）, nitrogen adsorption-desorption measurements, and X-ray diffraction （XRD）. The results showed that the changes of the pore parameters depended on both the surfactant content and heat treatment temperature. When the content of PEG was 10wt% and the obtained PEG/SiO2 composite was heated at 600℃, the mesoporous silica with a pore volume of 2.2 cma/g, a BET specific surface area of 361.55 m^2/g, and a diameter of 2-4 μm could be obtained. The obtained mesoporous silica materials have potential applications in the fields of paint and plastic, as thickening, reinforcing, and flatting agents.

关键词： mesoporous silica chemical precipitation high pore volume water glass nonionic surfactant

Oxygen vacancy promoting artificial atom(RuPd)by d-orbital coupling for efficient water dissociation

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Nano Research 2024年第8期17卷 7045-7052页

作者： Ruofan shen Yanyan Liu shuling Liu Shuyan Guan Huanhuan Zhang Sehrish Mehdi Saima Ashraf Ting-Hui Xiao Erjun Liang Jianchun Jiang Yongfeng Wang Baojun Li Laboratory of Zhongyuan Light School of PhysicsZhengzhou UniversityZhengzhou 450001China Key Laboratory of Materials Physics Ministry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450001China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of Science Henan Agricultural UniversityZhengzhou 450002China Department of Chemistry Tsinghua UniversityBeijing 100084China National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsCAFNanjing 210042China Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

Rational design of highly active catalysts for breaking hydrogen-oxygen bonds is of great significance in energy chemical reactions involving ***,an efficient strategy for the artificial atom(RuPd)established by d-orbital coupling and adjusted by oxygen vacancy(VO)is verified for water *** an experimental verification,the turnover frequency of RuPd-TiO_(2)-VO(RuPdTVO)catalyst in ammonia borane hydrolysis reaches up to 2750 min^(−1)(26,190 min−1 based on metal dispersion)in the absence of alkali,exceeding the highest active catalysts(Rh-based catalysts).The d-orbital coupling effect between Ru and Pd simulates the outer electronic structure of *** transfer from VO to(RuPd)constructs an electron-rich state of active sites that further enhances the ability of the artificial atom to dissociate *** work provides an effective electronic regulation strategy from VO and artificial atom constructed by d-orbital coupling effect for efficient water dissociation.

关键词： ammonia borane hydrolysis d-orbital coupling oxygen vacancy artificial atom water dissociation

1-MCP Regulates Ethanol Fermentation and GABA Shunt Pathway Involved in Kiwifruit Quality During Postharvest Storage

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Horticultural Plant Journal 2021年第1期7卷 23-30页

作者： Maratab Ali Muhammad Ammar Raza shenge Li Lichao Zhou Chen Huan shen shuling Xiaolin Zheng College of Food Science and Biotechnology Key Laboratory of Fruits and Vegetables Postharvest and Processing Technology Research of Zhejiang ProvinceZhejiang Gongshang UniversityHangzhou 310018China National Institute of Food Science and Technology Faculty of FoodNutrition and Home SciencesUniversity of AgricultureFaisalabad 38800Pakistan Fruit Professional Cooperative of Huaji Shan in Linhai City LinhaiZhejiang 317000China

Kiwifruit(Actinidia deliciosa)‘Bruno’is prone to accumulate ethanol rapidly after respiratory climacteric during storage at ambient conditions without stresses,which causes quality deterioration of the fruit associated with alcohol *** maintaining the postharvest quality of kiwifruit‘Bruno’,the effects of 1.0μL•L^−11-methylcyclopropene(1-MCP)treatment on regulating the ethanol fermentation andγ-aminobutyric acid(GABA)shunt pathway associated with control of alcohol off-flavor were investigated during storage at room temperature(24±1)°C for 27 *** results showed that 1-MCP treatment significantly reduced the respiration rate,ethylene production,decay rate,ascorbic acid(AsA)loss,and delayed the decline in the firmness and titratable acidity(TA),and the increase in total soluble solid(TSS)in ***,1-MCP treatment effectively inhibited the increases in contents of acetaldehyde,ethanol,and GABA along with the suppressed activities of key enzymes involved in ethanol fermentation and GABA shunt pathway,such as pyruvate decarboxylase(PDC),alcohol dehydrogenase(ADH),glutamate decarboxylase(GAD),and GABA-transaminase(GABA-T)in kiwifruit during *** conclusion,1-MCP treatment efficiently regulated the ethanol fermentation and GABA shunt pathway by delaying the ripening process to avoid the alcohol off-flavor development,thereby contributed to maintaining the quality of the kiwifruit.

关键词： kiwifruit ethanol fermentation GABA shunt pathway 1-methylcyclopropene quality

The role of gut microbiota associated metabolites in digestive disorders

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Engineered Regeneration 2024年第2期5卷 228-246页

作者： Na Li Cheng Zhao Pingnan Zhang Songting Wu Xiaotan Dou Saifei Xu Xiaoqi Zhang Chunyan Peng Ying Xie shuling Huang Lin Zhou Yonghua shen Lei Wang Jinglin Wang Chenggong Yu Department of Gastroenterology Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing210008China Division of Hepatobiliary and Transplantation Surgery Department of Gernal SurgeryNanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing210008China

The gut has been a focal point in the research of digestive system *** internal microbiota generates metabolites that function as signaling molecules and substrates,interacting with the intestinal wall and influ-encing host physiology and ***,the gut microbiota and metabolites owe highly diverse types and quantities,posing challenges for quantitative analysis,and monitoring frequent interactions between diges-tive tract metabolites and the intestinal wall remains a ***,research targeting gut microbiota metabolites has elucidated their relevance to digestive *** modulating metabolites such as short-chain fatty acids,bile acids,and lipopolysaccharides,it is possible to intervene in the progression of diseases such as inflammatory bowel disease and non-alcoholic fatty liver ***,research on gut microbiota is advancing,and more work is required to explore the interactions between host,microbes and underlying *** this review,we have revisited the generation of gut microbiota-related metabolites,their impact on diseases,and modes of interaction,emphasizing the significant role of metabolites in digestive system *** is believed that the linkage between gut microbiota and diseases in current research can be established through metabolites,providing a framework and foundation for research in the field of metabolomics and fundamental mechanisms.

关键词： Gut microbial metabolites Digestive disorders Inflammatory bowel disease(IBD) Non-alcoholic fatty liver disease(NAFLD)

Use of Azotobacter *** an indicator to detect the toxicity of heavy metals in soils

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Journal of Environmental Sciences 1990年第3期2卷 123-128页

作者： Liao Ruizhang, shen Qiuqin, Jin Lizhi, shen shuling, Qian Houyin and Guan ZhenshengInstitute of Soils and Fertilizers,Chinese Academy of Agricultural Sciences,Beijing,China

A physiological strain of microorganism - Azotobacter sp. has been adopted as an indicator to detect the toxicity of heavy metals in soils. The concentration of heavy metals to which Azotobacter sp. was behaving initially to have the resistance to heavy metals is defined as the critical poisoning concentration. The method of physiological threshold adopted can have a quantitative determination with reproducible results. The determined critical poisoning concentration is basically consistent with the results of heavy metals and arsenic toxicities to the bacteria reported recently in literatures. Total 9 typical soils, including 6 zonal soils and 3 purple soils, in the whole country were determined for the toxicities of 5 heavy metals and arsenic to Azotobacter sp. that resulted in 48 critical poisoning concentrations.

关键词： soil microorganisms azotobacter sp heavy metals poisoning concentra-tion.

可见光驱动的Ti基半导体光催化剂的研究进展

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有色金属材料与工程 2022年第5期43卷 1-12页

作者：沈淑玲熊舸上海理工大学材料与化学学院上海200093

半导体光催化技术在太阳能转换以及环境治理方面具有巨大潜力。TiO_(2)由于其高的光催化效率、良好的稳定性以及合适的带边电位等,成为了当前研究最多的光催化材料。但TiO_(2)是宽带隙半导体,对可见光几乎不响应,这极大限制了TiO_(2)的... 详细信息

半导体光催化技术在太阳能转换以及环境治理方面具有巨大潜力。TiO_(2)由于其高的光催化效率、良好的稳定性以及合适的带边电位等,成为了当前研究最多的光催化材料。但TiO_(2)是宽带隙半导体,对可见光几乎不响应,这极大限制了TiO_(2)的应用。为了提高TiO_(2)对可见光的响应能力,提高太阳能的转化效率,相继开发了一系列由TiO_(2)衍生的Ti基可见光催化剂。首先简单地介绍了半导体光催化机制,然后综述了Ti基半导体光催化剂的分类、增强可见光响应策略以及Ti基可见光催化剂应用现状,最后总结了Ti基可见光催化剂制备及应用过程中所面临的挑战,同时也对未来Ti基可见光催化剂的合成及发展进行了展望。

关键词： TiO_(2) 光催化 Ti基半导体可见光