检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Shen, xuwen Liu-zeng, Jing Shen, Xiaoming Ge, Yukui zeng, Xianyang Wang, Zijun Xing, Yukun Wang, Heng School of Earth System Science Tianjin University Tianjin300072 China National Institute of Natural Hazards Ministry of Emergency Management of China Beijing100085 China State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing100029 China School of Geography Earth and Atmospheric Sciences University of Melbourne VIC3010 Australia

The rugged southeast (SE) Tibet hosts a network of evolving faults, many of which are poorly understood due to a lack of sedimentary records and poor accessibility. The Jinsha River fault zone (JRFZ) is vaguely considered as a major fault bounding the Chuan-Dian Block in the northwest, yet little is known about its tectonic evolution history, which hinders our clear understanding of the tectonic deformation pattern, process and geomorphic response of SE Tibet. Here, we collected 10 samples from the hanging wall of the Xiongsong reverse fault, one strand of the JRFZ, near Markam area and on the trunk of the upper Jinsha River, to reveal its exhumation and kinematic history through low-temperature thermochronology. The ZHe ages (~17-13 Ma) of the samples from the hanging wall are much younger than the published ones in the footwall, but the AFT (~11-9 Ma) and AHe ages (~14-6 Ma) are only slightly younger than those in the footwall. The QTQt and 3-D thermo-kinematic Pecube modeling suggest consistently that the Xiongsong fault experienced strong activity during the mid-Miocene (~17-11 Ma) and then weakened. Post-11 Ma decreases in exhumation here on the trunk of the Jinsha river, if interpreted as river incision, is opposite to previously inferred river response to late Miocene surface uplift driven by the lower crust flow, implying the importance of local faulting in regional exhumation and perhaps the development of the Jinsha River. The late Miocene transition of faulting activity is found on other major faults in SE Tibet as well. We infer that the near synchronized change in regional fault activity may be caused by the clockwise rotation of the Chuan-Dian block, while its being extruded southeastward from the pushing front of the Indian collision. © 2023, The Authors. All rights reserved.

关键词： Rivers

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Coacervate-Based Instant and Repeatable Underwater Adhesive with Anticancer and Antibacterial Properties

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ACS APPLIED MATERIALS & INTERFACES 2021年第40期13卷 48239-48251页

作者： Peng, Qiongyao Wu, Qiuqiu Chen, Jingsi Wang, Tao Wu, Meng Yang, Diling Peng, xuwen Liu, Jifang Zhang, Hao zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Guangzhou Med Univ Affiliated Hosp 6 Qingyuan Peoples Hosp Qingyuan 511500 Guangdong Peoples R China

Underwater adhesion is a great challenge for the development of adhesives as the attractive interfacial intermolecular interactions are usually weakened by the surface hydration layer. The coacervation process of sessile organisms like marine mussels and sandcastle worms has inspired substantial research interest in the fabrication of long-lasting underwater adhesives, but they generally suffer from time-consuming curing triggered by surrounding environmental changes and cannot reserve the adhesiveness once damaged. Herein, an instant and repeatable underwater adhesive was developed based on the coacervation of tannic acid (TA) and poly(ethylene glycol)(77)-b-poly(propylene glycol)(29)-b-poly(ethylene glycol)(77) (PEG-PPG-PEG, F68), which was driven by hydrogen-bonding interaction, and the hydrophobic cores of F68 micelles offered an additional cross-linking to enhance the mechanical properties. The TA-F68 coacervates could be facilely painted on different substrates, exhibiting robust and instant underwater adhesion (with adhesion strength up to 1.1 MPa on porcine skin) and excellent repeatability (at least 1000 cycles), superior to the previously reported coacervates. Due to the biological activities of TA, the underwater adhesive displayed innate anticancer and antibacterial properties against different types of cancer cells and bacteria, showing great potential for diverse biomedical applications, such as injectable drug carriers, tissue glues, and wound dressings.

关键词： instant and repeatable underwater adhesive coacervation hydrogen-bonding interaction hydrophobic interaction anticancer antibacterial

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Adhesive Coacervates Driven by Hydrogen-Bonding Interaction

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SMALL 2020年第43期16卷 2004132-2004132页

作者： Peng, Qiongyao Chen, Jingsi zeng, Zicheng Wang, Tao Xiang, Li Peng, xuwen Liu, Jifang zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Guangzhou Med Univ Affiliated Hosp 5 Guangzhou 510700 Guangdong Peoples R China

Coacervation plays a critical role in numerous biological activities such as constructing biological tissues and achieving robust wet adhesion of marine sessile organisms, which conventionally occurs when oppositely charged polyelectrolytes are mixed in aqueous solutions driven by electrostatic attraction. Here, a novel type of adhesive coacervate is reported, driven by hydrogen-bonding interactions, readily formed by mixing silicotungstic acid and nonionic polyethylene glycol in water, providing a new approach for developing coacervates from nonionic systems. The as-prepared coacervate is easily paintable underwater, show strong wet adhesion to diverse substrates, and has been successfully applied as a hemostatic agent to treat organ injuries without displaying hemolytic activity, while with inherent antimicrobial properties thus avoiding inflammations and infections due to microorganism accumulation. This work demonstrates that coacervation can occur in salt-free environments via non-electrostatic interactions, providing a new platform for engineering multifunctional coacervate materials as tissue glues, wound dressings and membrane-free cell systems.

关键词： adhesive coacervates antimicrobial properties coacervation hydrogen bonding wet adhesion

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Coacervation-driven instant paintable underwater adhesives with tunable optical and electrochromic properties

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JOURNAL OF MATERIALS CHEMISTRY A 2021年第22期9卷 12988-13000页

作者： Peng, Qiongyao Chen, Jingsi Wang, Tao Gong, Lu Peng, xuwen Wu, Meng Ma, Yuhao Wu, Feiyi Yang, Diling Zhang, Hao zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Univ Alberta Dept Biomed Engn Edmonton AB T6G 2V2 Canada

Coacervation generally refers to liquid-liquid phase separation when mixing oppositely charged polyelectrolytes in an aqueous solution, which produces a polyelectrolyte-dense coacervate phase in a dilute solution phase. Coacervation plays a crucial role in many biological processes such as the versatile underwater adhesion of sessile organisms, cellular compartmentalization, and cell replication, which inspires a surge of biomimetic designs of underwater adhesives. However, conventional coacervate-based underwater adhesives are usually weak and lack functionalities, limiting their practical applications in biomedical and engineering fields. Herein, a novel instant underwater adhesive is presented based on coacervation via one-step mixing of aqueous solutions of silicotungstic acid (SiW) and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123) micelles, driven by hydrogen-bonding and hydrophobic interactions. The as-prepared adhesive possesses instant and excellent underwater adhesion (up to 479.6 kPa on poly(methyl methacrylate)) and can be facilely painted underwater on diverse substrates, showing resistance to water flush as well as repeatable stretching and bending of the substrates, superior to many previously reported coacervates. The adhesive also exhibits outstanding stability in high-salt aqueous solutions up to 3 M for at least 1200 h. The introduction of P123 endows the adhesives with thermo-responsive optical properties, while the innate reduction-related color switch of SiW offers electrochromic properties. The functional adhesives hold great promise in bioengineering applications and for the fabrication of novel flexible electronics such as smart aqueous batteries and low-power electrochromic windows.

关键词： Substrates

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Cation defect engineering in LaCoO3 perovskite as the "Two birds one stone" strategy to enhanced Fenton-like reaction: Regulating Co spin state and optimizing electron transfer ability

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SEPARATION AND PURIFICATION TECHNOLOGY 2024年 337卷

作者： Fang, Zhimo Feng, xuwen Zhou, Zhou zeng, Zepeng Xia, Yuangu Li, Jihong Liu, Ji Hu, Bin Li, Kai Lu, Qiang North China Elect Power Univ Natl Engn Res Ctr New Energy Power Generat Beijing 102206 Peoples R China

The reactive oxygen species (ROS) triggered by peroxymonosulfate (PMS), primarily composed of radicals and nonradicals, can deeply and selectively remove pollutants in complex wastewater. However, the low efficiency of electron transfer and insufficient surface catalytic sites remain the main obstacles to the development of efficient and selective PMS activators. Herein, we constructed ABO(3) perovskite catalysts (LaCoO3) with adjustable La vacancies (V-La) densities through urea introduction. Experiment, characterization, and theoretical calculation jointly revealed that VLa could not only induce electron delocalization in Co site to enhance the Co 3d - O 2p covalency for accelerating ROS (sulfate radicals (SO4 center dot-), singlet oxygen (O-1(2)), and high valent cobalt (Co(IV) = O)) generation, but also trigger the transition of spin-polarization configuration to form Co3+ (t(2g)(5)e(g)(1)) with the intermediate spin state as new active sites for surface-bound PMS* complexes production. The nonradical-dominated and radical-assisted system containing multi-site achieved efficient PMS utilization (95.6 %), excellent decontamination activity (0.753 min(-1)), good mineralization ability (82.7 %), satisfactory acid-base resistance (working pH range 3-11), and environmental robustness for actual water treatment. This study reveals the role of cation vacancy engineering in achieving "Two birds one stone" for PMS activation at the atomic level, which will guide the rational design of Fenton-like catalysts.

关键词： Peroxymonosulfate La vacancies Spin state Delocalization Radicals and nonradicals

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A novel nano-thermite system with BiOF as fluorine-containing oxidant for enhanced energy release performance

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CHEMICAL ENGINEERING JOURNAL 2023年第1期468卷

作者： Li, Jingwei Liu, xuwen Huang, Qian Liu, Feifan Xie, Quanmin Hu, Maocong Su, Jiaxin Zhang, Chengchen zeng, Yuyang Zhu, Chenguang Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China Shaanxi Appl Phys Chem Res Inst Sci & Technol Appl Phys Chem Lab Xian 710061 Peoples R China

The reduced diffusion distance of nano-thermite results in an exceptionally high energy release rate and intense exothermic reactions upon ignition, which has drawn significant interest from researchers in the field of energetic materials. With the deepening of research, metal fluorides are gradually favored by researchers because of their unique reaction characteristics. This paper presents the synthesis of a new fluorine-containing oxidant, BiOF, and its use in the preparation of a novel nano-thermite with n-Al. BiOF crystals exhibit a unique microscopic morphology and are interlaced into "nanoflower" microspheres, which allows for good interfacial contact between the oxidant and fuel during the recombination process. The resulting n-Al/BiOF system displays excellent ignition and combustion performance, with a combustion temperature higher than the boiling point of its main combustion products, AlF3 and Bi. Compared with n-Al/CuO and n-Al/MoO3 systems, n-Al/BiOF exhibits a higher flame propagation rate under confinement. In addition, the ignition threshold of the n-Al/BiOF system is also smaller than that of the n-Al/CuO and n-Al/MoO3 systems. Furthermore, the paper examines the reaction mechanism of the n-Al/BiOF system through thermal reaction path analysis and combustion and thermal analysis product characterization. The paper discovers a "pre-ignition" reaction mechanism before the ignition temperature, where the strongly electronegative fluorine in BiOF corrodes the Al2O3 shell, promoting the release of aluminum energy. The synergistic and effective interaction between oxygen, fluorine, and fuel aluminum in the n-Al/BiOF system results in efficient energy release performance, making BiOF a promising candidate for n-Al based reactive materials in propellants, explosives, and pyrotechnic products.

关键词： Nano-thermites Nanostructured energetic materials Conformational relationships Fluorinated oxidizing agent Pre-ignition reaction

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Probing the surface forces between air bubbles and bitumen via direct force Measurements: Effects of aqueous chemistry

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FUEL 2024年第PartC期357卷

作者： Yang, Diling Qiao, Chenyu Mao, Xiaohui Wang, Jingyi Xie, Lei Chen, Jingsi Peng, xuwen Peng, Qiongyao Wang, Tao Liu, Qi Zhang, Hao zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

The surface interactions of air bubbles and other components (e.g., particles, oil droplets) significantly influence the operation efficiency of a variety of engineering processes such as oily water treatment, bitumen extraction and flotation. Herein, the surface interactions of air bubbles with two types of Athabasca bitumen samples in aqueous solutions of varying pH, salinity, type of cations and in the presence of surfactants have been systematically characterized using a bubble probe atomic force microscope (AFM) technique. AFM imaging has revealed that exposure to high concentrations of NaCl and CaCl2 solutions or alkaline environments causes roughening of the bitumen surfaces. The results of surface force measurements demonstrate that the interaction and attachment behaviors between bubbles and bitumen are significantly affected by ionic strength, solution pH, and the presence of surfactants. The experimental force measurement results could be accurately described by a theoretical model that incorporates Reynolds lubrication theory and augmented Young-Laplace equation, with the inclusion of disjoining pressure. In low-salinity conditions, the bubble-bitumen interaction is dominated by electric double layer (EDL) repulsion, which prevents surface attachment. This effect is more pronounced at elevated pH conditions. In high-salinity solutions, however, the EDL interactions are significantly reduced, and the hydrophobic interaction becomes the dominant factor, overcoming the van der Waals repulsion and leading to the attachment of bubbles to bitumen surfaces. Raising aqueous pH weakens the bubble-bitumen hydrophobic interaction, whereas the introduction of calcium ions strengthens this interaction, resulting in enhanced surface attachment. Interestingly, even in high-salinity conditions, the presence of a small number of surfactants can inhibit bubble-bitumen contact, mainly caused by reduced hydrophobic attraction and increased steric repulsion. This work provid

关键词： bitumen oil sands bitumen flotation bubbles surface interactions

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Marketization and Energy Poverty: Empirical Evidence from China

SSRN

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SSRN 2022年

作者： Shi, Xinjie zeng, Pei Qiu, Tongwei Jiang, Qiang Cui, Liu Gao, xuwen Peking University China

Along with economic growth, improving the quality of life of its citizens is a focal issue for the Chinese government. Energy poverty—a topic closely related to people’s quality of life—has received global attention. This article focuses on the relationship between marketization and energy poverty, estimating the intrinsic relationship between marketization and energy poverty by constructing panel data using the instrumental variable method. The study reveals a significant upward trend in marketization in China in recent years, with a concomitant decrease in energy poverty. The results confirm that marketization improves the quantity of energy supply and alleviates energy poverty, and that the quality of energy supply is also an effective way for marketization to impact energy poverty. However, this mechanism is mainly reflected in the fact that marketization increases the accumulation of human capital and promotes the use of clean energy, but not in the improvement of energy supply efficiency by marketization. Additionally, marketization-led increase in people’s income alleviates energy poverty. This study adds to the existing literature and provides important policy insights for market-based development and energy poverty reduction. © 2022, The Authors. All rights reserved.

关键词： Economic analysis

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Recent Advances in Mechano-Responsive Hydrogels for Biomedical Applications

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ACS APPLIED POLYMER MATERIALS 2020年第3期2卷 1092-1107页

作者： Chen, Jingsi Peng, Qiongyao Peng, xuwen Han, Linbo Wang, Xiaogang Wang, Jianmei zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Shenzhen Technol Univ Coll Hlth Sci & Environm Engn Shenzhen 518118 Peoples R China Taiyuan Univ Sci & Technol Heavy Machinery Engn Res Ctr Educ Minist Taiyuan 030024 Peoples R China

Mechanical responsiveness is prevalent in biological systems and plays an essential role in many biomechanical processes. The past two decades have witnessed enormous effort devoted to the development of biomimetic mechano-responsive hydrogels which are capable of adapting their physical and chemical properties to external mechanical stimuli. Due to the combination of tissue similarity and mechano-responsive properties, this type of hydrogel offers great advantages for diverse biomedical applications. Strain-stiffening and self-healing hydrogels duplicate the physiological properties of biological tissues, serving as promising candidates for artificial tissues, tissue scaffolds, and wound dressings. The shear-thinning property provides the hydrogels injectability, and the regional delivery contributes to minimally invasive treatment. Mechanochromic hydrogels allow the direct visualization of mechanical stress, holding great promise in biosensing and diagnosing. This review highlights the most recent developments in mechano-responsive hydrogels with various applications in the biomedical field. Different types of mechano-responsive hydrogels are introduced with focus on their responsive mechanisms, design strategies, and in vitro/in vivo performances, providing useful insights into the understanding and future research directions of mechano-responsive hydrogels with applications in biomedical engineering.

关键词： mechano-responsive hydrogel strain-stiffening self-healing shear-thinning mechanochromic

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利用构造地貌方法限定走滑断裂第四纪滑动速率的不确定性及意义:以海原断裂带为例

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地球科学 2024年第2期49卷 759-780页

作者：王子君姚文倩刘静邵延秀王文鑫沈续文高云鹏徐晶天津大学地球系统科学学院表层地球系统科学研究院天津300072 中国地震局地质研究所地震动力学国家重点实验室北京100029 中国地震局第二监测中心陕西西安710054

断层滑动速率是理解复杂断层系统应变分配与评估地震危险性的重要参数,在多种研究方法中,利用构造地貌学方法限定走滑断裂的第四纪滑动速率较为普遍.在青藏高原活动断裂体系中,海原断裂带承载了部分印度-欧亚板块碰撞产生的应变,其滑动... 详细信息

断层滑动速率是理解复杂断层系统应变分配与评估地震危险性的重要参数,在多种研究方法中,利用构造地貌学方法限定走滑断裂的第四纪滑动速率较为普遍.在青藏高原活动断裂体系中,海原断裂带承载了部分印度-欧亚板块碰撞产生的应变,其滑动速率的精细厘定也是高原构造变形动力学分析的重要参数.过去三十年间前人采用构造地貌学方法对其进行了大量的滑动速率研究,结果位于2.3~16 mm/a之间,不同研究间相差较大,因此引发了众多争议与困惑.在对已有研究进行详细评述的基础上,指出前人研究结果不确定性的重要原因是上级阶地与下级阶地重建模型的选择.结果认为,基于两种位移累积起始时间定义的模型得到的往往是滑动速率的上限或下限,不能简单地将其等同于滑动速率真实值.当缺乏观测数据可以辅助判别两种模型的可靠程度时,应基于上、下级阶地废弃年龄同时对滑动速率进行限定,这是对滑动速率计算过程中客观存在的不确定性的尊重和认可.海原断裂带滑动速率的评估将为后续基于青藏高原内部诸多活动断裂进行两种端元变形模型合理性的分析工作提供重要的方法借鉴.

关键词：滑动速率海原断裂带构造地貌学河流阶地陡坎上、下限评估

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