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Science China Chemistry 2024年第6期67卷 1881-1903页

作者： dayang wang Xiaohua Li Huanchen Yao Xin Liu Yan Gao Hailin Cong Bing Yu Youqing Shen College of Chemistry and Chemical Engineering College of Life SciencesCollege of Materials Science and EngineeringInstitute of Biomedical Materials and EngineeringQingdao UniversityQingdao266071China State Key Laboratory of Bio-Fibers and Eco-Textiles Qingdao UniversityQingdao266071China School of Materials Science and Engineering Shandong University of TechnologyZibo255000China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Center for Bionanoengineeringand Department of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China

Nanomedicine delivery technology plays an important role in modern medicine and has shown good therapeutic effects in scientific research.Polysaccharides have the characteristics of wide sources,excellent biocompatibility,and non-toxicity.In addition,there are multifunctional groups on the main chain of polysaccharides,which can be surface-modified or functionalized to have targeting ability through specific sugar parts.Amphiphilic polysaccharide micelles with good biocompatibility,degradability,high safety,easy structural modification,and special core-shell structure are regarded as ideal carriers for nanomedicines.Therefore,this review is focused on the hydrophobic modification designs of polysaccharides,the preparation methods and characteristics of micelles,and the applications of amphiphilic polysaccharide micelles in the field of biomedicine.It is expected to provide some ideas and inspiration for the design of polysaccharide drug carriers.

关键词： polysaccharide hydrophobic modification micelle drug delivery biomedicine

Quantitative research of the liquid film characteristics in upward vertical gas, oil and water flows

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Chinese Journal of Chemical Engineering 2023年第2期54卷 67-79页

作者： dayang wang Ningde Jin Lusheng Zhai Yingyu Ren College of Information Science and Engineering Northeastern UniversityShenyang 110819China School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

The study of liquid film characteristics in multiphase flow is a very important research topic, however,the characteristics of the liquid film around Taylor bubble structure in gas, oil and water three-phase flow are not clear. In the present study, a novel liquid film sensor is applied to measure the distributed signals of the liquid film in three-phase flow. Based on the liquid film signals, the liquid film characteristics including the structural characteristics and the nonlinear dynamics characteristics in three-phase flows are investigated for the first time. The structural characteristics including the proportion, the appearance frequency and the thickness of the liquid film are obtained and the influences of the liquid and gas superficial velocities and the oil content on them are investigated. To investigate the nonlinear dynamics characteristics of the liquid film with the changing flow conditions, the entropy analysis is introduced to successfully uncover and quantify the dynamic complexity of the liquid film behavior.

关键词： Gas oil and water three-phase flow Liquid film characteristics Liquid film sensor Nonlinear dynamics analysis

Peat properties of a tropical forest reserve adjacent to a fire-break canal

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Journal of Forestry Research 2024年第1期35卷 155-167页

作者： dayang Nur Sakinah Musa Mohd Zahirasri Mohd Tohir Xinyan Huang Luqman Chuah Abdullah Mohamad Syazaruddin Md Said Muhammad Firdaus Sulaiman Safety Engineering Interest Group(SEIG) Department of Chemical and Environmental EngineeringFaculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia International Tropical Forestry Programme Faculty of Tropical ForestryUniversiti Malaysia SabahSabahMalaysia Department of Land Management Faculty of AgricultureUniversiti Putra MalaysiaSelangorMalaysia Research Centre for Fire Safety Engineering Department of Building Environment and Energy EngineeringThe Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China

Tropical peat comprises decomposed dead plant material and acts like a sponge to absorb water,making it fully saturated.However,drought periods dry it readily and increases its vulnerability to fire.Peat fires emit greenhouse gases and particles contributing to haze,and prevention by constructing fire-break canals to reduce fire spread into forest reserves is crucial.This paper aims to determine peat physical and chemical properties near a fire-break canal at different fire frequency areas.Peat sampling was conducted at two forest reserves in Malaysia which represent low fire frequency and high fire frequency areas.The results show that peat properties were not affected by the construction of a fire-break canal,however lignin and cellulose content increased significantly from the distance of the canal in both areas.The study concluded that fire frequency did not significantly influence peat properties except for porosity.The higher fibre content in the high frequency area did not influence moisture content nor the ability to regain moisture.Thus,fire frequency might contribute differently to changes in physical and chemical properties,hence management efforts to construct fire-break canals and restoration efforts should protect peatlands from further degradation.These findings will benefit future management and planning for forest reserves.

关键词： Peat fire Peat properties Fire-break canals Forest reserves

Assessing the capacity of biochar to stabilize copper and lead in contaminated sediments using chemical and extraction methods

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Journal of Environmental Sciences 2019年第5期31卷 91-99页

作者： Mingming wang Liangsuo Ren dayang wang Zuansi Cai Xuefeng Xia Aizhong Ding College of Water Sciences Beijing Normal University School of Engineering and the Built Environment Edinburgh Napier University

Because of its high adsorption capacity, biochar has been used to stabilize metals when remediating contaminated soils; to date, however, it has seldom been used to remediate contaminated sediment. A biochar was used as a stabilization agent to remediate Cu-and Pb-contaminated sediments, collected from three locations in or close to Beijing. The sediments were mixed with a palm sawdust gasified biochar at a range of weight ratios(2.5%, 5%, and 10%) and incubated for 10, 30, or 60 days. The performance of the different treatments and the heavy metal fractions in the sediments were assessed using four extraction methods, including diffusive gradients in thin films, the porewater concentration, a sequential extraction, and the toxicity characteristic leaching procedure. The results showed that biochar could enhance the stability of heavy metals in contaminated sediments. The degree of stability increased as both the dose of biochar and the incubation time increased. The sediment p H and the morphology of the metal crystals adsorbed onto the biochar changed as the contact time increased. Our results showed that adsorption,metal crystallization, and the p H were the main controls on the stabilization of metals in contaminated sediment by biochar.

关键词： Biochar Sediment Heavy metal Stabilization assessment

Review on utilization of biochar for metal-contaminated soil and sediment remediation

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Journal of Environmental Sciences 2018年第1期30卷 156-173页

作者： Mingming wang Yi Zhu Lirong Cheng Bruce Andserson Xiaohui Zhao dayang wang Aizhong Ding College of Water Sciences Beijing Normal University Department of Civil Engineering Queen's University

Biochar is a carbon-neutral or even carbon-negative material produced through thermal decomposition of plant-and animal-based biomass under oxygen-limited conditions.Recently, there has been an increasing interest in the application of biochar as an adsorbent, soil ameliorant and climate mitigation approach in many types of applications.Metal-contaminated soil remediation using biochar has been intensively investigated in small-scale and pilot-scale trials with obtained beneficial results and multifaceted effects.But so far, the study and application of biochar in contaminated sediment management has been very limited, and this is also a worldwide problem. Nonetheless, there is reason to believe that the same multiple benefits can also be realized with these sediments due to similar mechanisms for stabilizing contaminants. This paper provides a review on current biochar properties and its use as a sorbent/amendment for metal-contaminated soil/sediment remediation and its effect on plant growth, fauna habits as well as microorganism communities. In addition, the use of biochar as a potential strategy for contaminated sediment management is also discussed, especially as regards in-situ planning. Finally, we highlight the possibility of biochar application as an effective amendment and propose further research directions to ensure the safe and sustainable use of biochar as an amendment for remediation of contaminated soil and sediment.

关键词： Biochar Metal contamination Soil/sediment remediation Biological effect

全氟-2,2-二甲基-1,3-二氧环戊烯-四氟乙烯共聚物平均分子量、分子量分布和流变特性

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高校化学工程学报 2024年第1期38卷 128-134页

作者：郑威余大洋包永忠浙江大学化学工程与生物工程学院化学工程联合国家重点实验室(浙江大学)浙江杭州310058 浙江大学衢州研究院浙江衢州324000

全氟-2,2-二甲基-1,3-二氧环戊烯-四氟乙烯(PDD-TFE)共聚物是高性能含氟聚合物,开展PDD-TFE共聚物平均分子量(MW)、分子量分布(MWD)和流变特性研究对拓展其加工应用有重要意义。鉴于溶液法测定PDD-TFE共聚物MW及MWD存在难度,建立了由动... 详细信息

全氟-2,2-二甲基-1,3-二氧环戊烯-四氟乙烯(PDD-TFE)共聚物是高性能含氟聚合物,开展PDD-TFE共聚物平均分子量(MW)、分子量分布(MWD)和流变特性研究对拓展其加工应用有重要意义。鉴于溶液法测定PDD-TFE共聚物MW及MWD存在难度,建立了由动态流变法和动态黏弹法获得PDD-TFE共聚物MW及MWD的改进方法。根据Fox方程、共聚物结构和性能参数得到了PDD-TFE共聚物的零切黏度与MW之间的关系;通过Carreau-Yasuda方程拟合PDD-TFE共聚物的复数黏度与频率之间的关系,得到了零切黏度。在实验测定PDD-TFE共聚物的储能模量与频率关系基础上,应用动态黏弹法得到其MW及MWD,并进一步研究了220℃时PDD-TFE共聚物的MW及MWD对共聚物熔体流变特性的影响,发现共聚物的MWD越宽,共聚物熔体的“剪切变稀”行为越明显;随着共聚物MW增大,共聚物熔体的非牛顿性越强。

关键词：全氟-2,2-二甲基-1,3-二氧环戊烯-四氟乙烯共聚物平均分子量流变特性黏度

Solvent and guest-binding-controlled chiroptical inversion of molecular devices based on pseudo[1]catenane-type pillar[5]arene derivatives

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Chinese Chemical Letters 2024年第1期35卷 280-284页

作者： Yongjun Lv Chao Xiao Jingyu Ma dayang Zhou Wanhua Wu Cheng Yang College of Chemical Engineering Sichuan University of Science&EngineeringZigong 643000China College of Chemistry Sichuan UniversityChengdu 610064China Zhejiang NHU Pharmeceutical Co. Ltd.Shaoxing 312000China Comprehensive Analysis Center ISIROsaka UniversityOsaka 567-0047Japan

Four pillar[5]arene-based bicyclic compounds,so-called molecular universal joint(MUJ),were synthesized by incorporating a bisamide ring containing N,O,or S-heteroatom groups,which served as stimuli-responsive chiroptical molecular devices.The structure of MUJ was confirmed by 1H NMR spectra and single-crystal X-ray diffraction analysis,and their planar-chiral enantiomers were successfully separated.Chiroptical inversion behaviors from in to out configurations triggered by temperature,solvent,and guest complexation were investigated by circular dichroism spectra.Chiroptical inversion could be realized in the presence of adiponitrile in certain solvents due to the solvation effects on the side ring and the threading of the guest into the pillar[5]arene cavity.However,the stronger self-included interactions between the cavity and the inside ring of certain MUJs led to inhibition of the switching.

关键词： Pillararene N,O,S-containg ring Bicycles Solvation Chirality inversion

A quantitative analysis model of grid cyber physical systems

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Global Energy Interconnection 2018年第5期1卷 618-626页

作者： Li Huang Yun Liang Feng Huang dayang wang Global Energy Interconnection Research Institute Co. Ltd. State Grid Laboratory of Electric Power Communication Network Technology State Grid Jiangsu Electric Power Company

Conventional power systems are being developed into grid cyber physical systems(GCPS) with widespread application of communication, computer, and control technologies. In this article, we propose a quantitative analysis method for a GCPS. Based on this, we discuss the relationship between cyberspace and physical space, especially the computational similarity within the GCPS both in undirected and directed bipartite networks. We then propose a model for evaluating the fusion of the three most important factors: information, communication, and security. We then present the concept of the fusion evaluation cubic for the GCPS quantitative analysis model. Through these models, we can determine whether a more realistic state of the GCPS can be found by enhancing the fusion between cyberspace and physical space. Finally, we conclude that the degree of fusion between the two spaces is very important, not only considering the performance of the whole business process, but also considering security.

关键词： Cyber physical systems Quantitative analysis algorithm Bipartite network Smart grid

页岩油赋存特征、可动性实验技术及研究方法进展

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油气地质与采收率 2024年第4期31卷 84-95页

作者：李政包友书朱日房王秀红王鑫吴连波王忠王大洋页岩油气富集机理与高效开发全国重点实验室山东东营257015 中国石化胜利油田分公司勘探开发研究院山东东营257015 中国石化页岩油气勘探开发重点实验室山东东营257015 国家能源页岩油研发中心山东东营257015

赋存特征与可动性是页岩油评价及勘探开发的一项重要内容,但由于页岩非均质性强,孔隙结构及流体性质较为复杂,页岩油赋存特征及可动性的表征仍存在较大挑战。近些年,随着中外页岩油勘探开发的进行,一些新的研究方法和实验技术不断涌现... 详细信息

赋存特征与可动性是页岩油评价及勘探开发的一项重要内容,但由于页岩非均质性强,孔隙结构及流体性质较为复杂,页岩油赋存特征及可动性的表征仍存在较大挑战。近些年,随着中外页岩油勘探开发的进行,一些新的研究方法和实验技术不断涌现。为此,针对页岩油赋存特征及可动性评价方面的研究方法和实验技术进展进行了梳理,并提出了页岩油赋存特征及可动性研究需要考虑的问题。现有技术中,利用先进的高分辨率成像技术进行图像观察是定性评价页岩油赋存特征的最直接方法;基于统计分析的油饱和度指数法和分级评价方法在成熟探区评价页岩油可动性具有优势;多温阶热解参数法是目前快速高效定量表征不同赋存状态页岩油量的方法,在页岩含油性、页岩油可动性及资源量评价方面具有较好的应用前景。在未来页岩油赋存特征及可动性研究时,需要充分考虑以下问题:①开发高仿真的页岩油富集、流动及开发模拟实验,保证实验条件与地下地质条件的相似性。②开展微纳米尺度下页岩油微观流动实验,探索页岩油微观流动机理及控制因素。③详细剖析不同基础薄层中页岩油赋存特征及可动性的差异性,以及不同基础薄层对页岩含油性及页岩油可动性的贡献。④将页岩油微观赋存形式、流体机理与宏观地质参数结合,确定评价页岩油可动性的宏观地质条件及参数。

关键词：页岩油赋存特征可动性游离油吸附油多温阶热解实验技术

直立锁边金属屋面系统抗风设计与结构承载力试验

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建筑结构 2024年第6期54卷 141-147页

作者：王明明辛志勇葛连福汪大洋张永山广州大学土木工程学院广州510006 珠海安维特工程检测有限公司珠海519100 中冶建筑研究总院有限公司北京100088 广东省建筑金属围护系统工程技术研究中心广州510006

直立锁边金属屋面因抗风揭强度不足常出现风揭破坏。为了详细分析直立锁边金属屋面系统的抗风揭性能,首先,提出了抗风设计关键技术问题。然后,对屋面关键部位的风荷载计算和屋面系统的结构抗力进行研究。最后,对如何选择抗风揭试验方法... 详细信息

直立锁边金属屋面因抗风揭强度不足常出现风揭破坏。为了详细分析直立锁边金属屋面系统的抗风揭性能,首先,提出了抗风设计关键技术问题。然后,对屋面关键部位的风荷载计算和屋面系统的结构抗力进行研究。最后,对如何选择抗风揭试验方法来获得结构承载力进行对比分析。结果表明,在计算屋面风荷载时,应重点关注局部关键部位,采取规范计算和风洞试验相结合的方法进行验证;在确定直立锁边金属屋面系统结构承载力时,需综合考虑抗风揭静态和动态试验结果。

关键词：压型金属板直立锁边金属屋面系统抗风设计检测结构可靠度抗风揭试验抗风揭性能