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Manipulating the Phase Transition Behavior of Dual Temperature-Responsive Block Copolymers by Adjusting Composition and Sequence

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Chinese Journal of Polymer Science 2024年第2期42卷 176-187,I0006页

作者： Zhi Zou xiang xu Hai-Tao Zhao jian-nan Cheng Wei-Wei He Li-Fen Zhang Zhen-Ping Cheng Suzhou key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of JiangsuSoochow UniversitySuzhou215123China

Temperature-responsive polymers have garnered significant attention due to their ability to respond to external *** this work,dual temperature-responsive block copolymers are synthesized via reversible addition-fragmentation chain transfer polymerization(RAFT)polymerization utilizing zwitterionic monomer methacryloyl ethyl sulfobetaine(SBMA) and n-isopropyl acrylamide(nIPAAm) as *** thermal responsive behaviors can be easily modulated by incorporating additional hydrophobic monomer benzyl acrylate(Bn) or hydrophilic monomer acrylic acid(AA),adjusting concentration or pH,or varying the degree of polymerization of the block chain *** cloud points of the copolymers are determined by UV-Vis spectrophotometry,and these copolymers exhibit both controlled upper and lower critical solu bility temperatures(LCST and UCST) in aqueous *** study analyzes and summarizes the influencing factors of dual temperature responsive block copolymers by exploring the effects of various conditions on the phase transition temperature of temperature-sensitive polymers to explore the relationship between their properties and environment and structure to make them more selective in terms of temperature application range and regulation *** is very interesting that the introduction of poly-acrylic acid(PAA) segments in the middle of di-block copolymer PSBMA_(55)-b-PnIPAAm_(80) to form PSBMA_(55)-b-PAA_(x)-b-PnIPAAm_(80) results in a reversal of temperature-responsive behaviors from 'U'(LCST UCST) type,while the copolymer PSBMA_(55)-b-P(nIPAAm_(80)-co-AA_(x)) *** work provides a clue for tuning the phase transition behavior of polymers for manufacture of extreme smart materials.

关键词： Temperature responsive polymers High critical solubility temperature(UCST) Low critical solubility temperature(LCST) Block copolymers

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Bioinspired Tactile Sensation Based on Synergistic Microcrack-Bristle Structure Design toward High Mechanical Sensitivity and Direction-Resolving Capability

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Research 2024年第1期2023卷 611-624页

作者： Yiqun Zhang Qi Liu Wenjuan Ren Yangyang song Hua Luo Yangyang Han Liang He xiaodong Wu Zhuqing Wang School of Mechanical Engineering Sichuan UniversityChengdu 610065China Med+x Center for Manufacturing West China HospitalSichuan UniversityChengdu 610041China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

natural tactile sensation is complex,which involves not only contact force intensity detection but also the perception of the force direction,the surface texture,and other mechanical ***,the vast majority of the developed tactile sensors can only detect the normal force,but usually cannot resolve shear force or even distinguish the directions of the ***,we present a new paradigm of bioinspired tactile sensors for resolving both the intensity and the directions of mechanical stimulations via synergistic microcrack-bristle structure design and cross-shaped configuration *** microcrack sensing structure gives high mechanical sensitivity to the tactile sensors,and the synergistic bristle structure further amplifies the sensitivity of the *** cross-shaped configuration engineering of the synergistic microcrack-bristle structure further endows the tactile sensors with good capability to detect and distinguish the directions of the applied mechanical *** as-fabricated tactile sensors exhibit a high sensitivity(25.76 n^(−1)),low detection limit(5.4 mn),desirable stability(over 2,500 cycles),and good capability to resolve both mechanical intensity and directional *** promising application scenarios,surface texture recognition and biomimetic path explorations are successfully demonstrated with these tactile *** newly proposed tactile sensation strategy and technology have great potential applications in ingenious tactile sensation and construction of various robotic and bionic prostheses with high operational dexterity.

关键词： crack sensation directions

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高海拔隧道施工期污染物扩散规律

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浙江大学学报（工学版） 2024年第1期58卷 176-187页

作者：陈星宇吴剑任松张平邓超孔令伟重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044 中铁西南科学研究院有限公司四川成都611731 昭通市昭泸高速公路投资开发有限公司云南昭通657000

为了探究高海拔隧道施工通风过程中的污染物扩散规律,依托川藏铁路芒康山隧道工程,采用数值模拟和现场测试的方法,研究高海拔隧道施工通风过程中粉尘和CO的扩散规律.研究结果表明,粉尘主要是以贴壁流动的形式向洞外扩散,在该过程中会聚... 详细信息

为了探究高海拔隧道施工通风过程中的污染物扩散规律,依托川藏铁路芒康山隧道工程,采用数值模拟和现场测试的方法,研究高海拔隧道施工通风过程中粉尘和CO的扩散规律.研究结果表明,粉尘主要是以贴壁流动的形式向洞外扩散,在该过程中会聚集成为“粉尘团”.粉尘扩散主要是受到重力影响发生沉降,隧道内风速过大,不利于降低粉尘质量浓度.CO以“气团”的形式从掌子面附近向洞口迁移,在迁移过程中CO气团体积逐渐扩大,质量浓度峰值不断下降,逐渐形成“U形”的分布趋势,CO质量浓度的现场测试结果与数值模拟结果基本吻合.随着海拔高度的上升,隧道内的CO质量浓度会增大,隧道内同一位置CO质量浓度达到规范要求的时间会增加.推导基于海拔高度的隧道通风过程中CO质量浓度修正系数计算公式,对当前规范中CO的海拔高度修正系数进行很好的补充.

关键词：高海拔隧道通风污染物扩散现场测试修正系数

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Individualized Traditional Chinese Medicine treatment vs antibiotics for recurrent urinary tract infections: a multicenter, randomized controlled study

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Journal of Traditional Chinese Medicine 2024年第3期44卷 524-529页

作者： GU xiangchen QIU Meisi xIE Lin CHEn Min DEnG Yueyi ZHAnG Changming jian Guihua WAnG Chen WAnG Yi Department of nephrology Yueyang Hospital of Integrated Traditional Chinese and Western Medicine Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 200437China Department of nephrology Rizhao Hospital of Traditional Chinese MedicineShanghai 200437China Department of nephrology Longhua Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai200032China Department of nephrology Shanghai Municipal Traditional Chinese Medicine Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 200071China Department of nephrology the Sixth People's Hospital Affiliated Shanghai Jiaotong UniversityShanghai 200233China Department of nephrology Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China

OBJECTIVE: To systematically assess the effects of individualized Chinese medicines on recurrent urinary tract infections(rUTIs).METHODS: This study recruited 230 adult female patients in the remission phase of rUTIs from five hospitals in China. The patients were randomly allocated to two groups: an individualized Chinese medicine group(n = 114) and a control group(n = 116). Patients in the Chinese medicine group received individualized Chinese herbs, which were evaluated for syndrome *** in the control group received antibiotic treatment combined with a Chinese medicine placebo. The duration of treatment was three courses of four weeks each, with a three-month subsequent follow-up. UTI recurrence rate,Traditional Chinese Medicine(TCM) syndrome scores,36-item Short Form Survey(SF-36) score, and urine secretory immunoglobulin A(SIgA) were measured and analyzed before and after treatment in each group. RESULTS: Patients from the Chinese medicine group exhibited significant decreases in both short-and longterm UTI recurrence rates compared with the control group(P nges in TCM syndrome scores between the Chinese medicine and control groups were significant(P nges in the average SF-36 quality-of-life scores in the Chinese medicine group were also significantly higher than those in the control group after treatment(P nese medicine group also demonstrated a significant increase in urine SIg A expression. COnCLUSIOn: Taken together, compared to the oftenused long-term antimicrobial prophylaxis during the remission stage of r UTIs, treating patients with an individualized Chinese medicine decoction by syndrome differentiation could effectively reduce the recurrence rate, improve the patients' TCM syndrome scores and quality of life, and enhance immunity, which in turn helps to prevent antibiotic resistance.

关键词： urinary tract infections medicine Chinese traditional syndrome differentiation quality of life immunoglobulin A secretory randomized controlled trial

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考虑风险时空分布特征的跟驰工况行车风险预测

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汽车工程 2024年第5期46卷 766-775,753页

作者：宋东鉴赵健朱冰佟静韩嘉懿刘斌吉林大学汽车仿真与控制国家重点实验室长春130022 吉林大学汽车工程学院长春130022 中国第一汽车集团有限公司长春130011

行车风险预测对提升智能汽车行车安全性至关重要,为此本文提出了一种跟驰工况下的行车风险预测模型(car-following risk prediction model, CRPM)。跟驰中车辆的减速能够反映驾驶人的认知风险,故根据车辆纵向加速度标注跟驰风险等级,并... 详细信息

行车风险预测对提升智能汽车行车安全性至关重要,为此本文提出了一种跟驰工况下的行车风险预测模型(car-following risk prediction model, CRPM)。跟驰中车辆的减速能够反映驾驶人的认知风险,故根据车辆纵向加速度标注跟驰风险等级,并构建基于各向异性行车风险场的风险时空分布特征以用作CRPM的输入。CRPM通过卷积神经网络提取风险的空间分布特性,利用双向长短期记忆网络和注意力机制处理风险的时序依赖关系,最终输出跟驰风险等级。CRPM在航拍数据集AD4CHE上进行训练和测试。结果表明,CRPM具有良好的预测精度和提前预测时间,预测准确率达99.67%,在风险发生前2 s预测准确率为96.73%。

关键词：行车风险预测风险时空分布跟驰航拍数据

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Long-term thinning decreases the contribution of heterotrophic respiration to soil respiration in subalpine plantations

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Journal of Forestry Research 2024年第3期35卷 189-204页

作者： Longfei Chen Zhibin He Wenzhi Zhao xi Zhu Qin Shen Mingdan song Zhengpeng Li Junqia Kong Shuping Yang Yuan Gao northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000People's Republic of China State Forestry Administration Key Laboratory of Forest Resources and Environmental Management Beijing Forestry UniversityBeijing 100083People's Republic of China Academy of Agriculture and Forestry Sciences Qinghai UniversityXining 810000People's Republic of China College of Landscape Architecture Zhejiang A&F UniversityHangzhou 310000People's Republic of China

Interest in the dynamics of soil respiration(R_(S))in subalpine forest ecosystems is increasing due to their high soil carbon density and potential sensitivity to environmental ***,as a principal silvicultural practice,the long-term impacts of thinning on R_(S) and its heterotrophic and autotrophic respiration components(R_(h) and Ra,respectively)in subalpine plantations are poorly understood,espe-cially in winter.A 3-year field observation was carried out with consideration of winter CO_(2) efflux in middle-aged sub-alpine spruce plantations in northwestern China.A trench-ing method was used to explore the long-term impacts of thinning on Rs,Rn and R_(a).Seventeen years after thinning,mean annual Rs,Rn and R_(a) increased,while the contribu-tion of R_(h) to R_(s) decreased with thinning *** significantly decreased winter R,because of the reduction in R_(n) but had no significant effect on *** temperature sensitivity(Q_(10))of R_(h) and R_(a) also increased with thinning intensity,with lower Q_(10) values for R_(h)(2.1-2.6)than for Ra(2.4-2.8).The results revealed the explanatory variables and pathways related to R_(n) and R_(a) *** increased soil moisture and nitrate nitrogen(nO_(3)^(-)-n),and the enhanced nitrogen and water availability promoted R_(h) and R_(a) by improving fine root biomass and microbial *** results highlight the positive roles of nO_(3)^(-)-n in stimulating R_(s) components following long-term ***,applications of nitrogen fertilizer are not recommended while thinning subalpine spruce plantations from the perspective of reducing soil CO_(2) *** increased Q_(10) values of R_(s) components indicate that a large increase in soil CO_(2) emissions would be expected following thinning because of more pronounced climate warming in alpineregions.

关键词： Heterotrophic respiration Autotrophic respiration Long-term thinning impacts Cold seasons Subalpine plantations Temperature sensitivity

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基于惯性增强效应的曲线轨道结构垂向振动控制

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交通运输工程学报 2024年第3期24卷 204-216页

作者：杨舟冯青松张凌陆建飞华东交通大学轨道交通基础设施性能监测与保障国家重点实验室江西南昌330013 江苏大学土木工程与力学学院江苏镇江212013

针对曲线轨道的垂向振动控制,基于惯性增强效应,引入了调谐质量阻尼惯容器(TMDI)和振幅放大型调谐质量阻尼器(AM-TMD),以实现更佳的振动控制效果;将曲线轨道考虑为离散支承的曲线Timoshenko梁结构,采用能量泛函变分法建立了有限长曲线... 详细信息

针对曲线轨道的垂向振动控制,基于惯性增强效应,引入了调谐质量阻尼惯容器(TMDI)和振幅放大型调谐质量阻尼器(AM-TMD),以实现更佳的振动控制效果;将曲线轨道考虑为离散支承的曲线Timoshenko梁结构,采用能量泛函变分法建立了有限长曲线轨道分析模型;在曲线钢轨两端引入完美匹配层作为低反射边界条件,用于更好地模拟无限长轨道结构;通过与已有无限长离散支承曲线轨道动力响应计算结果的对比,验证了分析模型的准确性以及完美匹配层的有效性;分析了垂向固定谐荷载作用下,调谐质量阻尼器(TMD)、TMDI和AM-TMD对曲线轨道动力响应的影响,评估了TMD、TMDI和AM-TMD的减振性能;分析了振幅放大系数与TMD工作能力之间的关系,揭示了AM-TMD的工作机理。研究结果表明:TMDI的引入有效地弥补了传统TMD在实现宽频控制时的质量缺陷,与TMD相比,同参数的TMDI工作带宽拓宽约1.5倍,最大振动衰减提升了约5.5 dB;AM-TMD的实质在于利用振幅放大机构来同步增大TMD的有效质量、刚度和阻尼,进而全面提升TMD的工作能力,与TMD相比,同参数的AM-TMD工作带宽拓宽约2.0倍,最大振动衰减提升了约6.1 dB。可见,从宽频控制、高衰减率的角度考虑,TMDI、AM-TMD比TMD更具优势。

关键词：城市轨道交通曲线轨道振动控制惯性增强效应惯容器振幅放大

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载有Mx.ne的钴氮掺杂碳纳米纤维在锂硫电池中的应用

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纺织学报 2024年第4期45卷 24-32页

作者：宋贝贝赵浩阅李欣宇屈展方剑苏州大学纺织与服装工程学院江苏苏州215021 苏州大学现代丝绸国家工程实验室江苏苏州215123

为缓解锂硫电池中多硫化物的穿梭效应,在钴氮掺杂纳米纤维中引入Mx.ne纳米片,利用静电纺丝与高温炭化技术,制备了载有Mx.ne纳米片的钴氮掺杂碳纳米纤维(Mx-Co/n-PCnFs),并将其作为锂硫电池中间层,探讨了Mx-Co/n-PCnFs中间层的形貌结构和... 详细信息

为缓解锂硫电池中多硫化物的穿梭效应,在钴氮掺杂纳米纤维中引入Mx.ne纳米片,利用静电纺丝与高温炭化技术,制备了载有Mx.ne纳米片的钴氮掺杂碳纳米纤维(Mx-Co/n-PCnFs),并将其作为锂硫电池中间层,探讨了Mx-Co/n-PCnFs中间层的形貌结构和Mx.ne的添加对于多硫化物的吸附以及电池电化学性能的影响。结果表明:当Mx.ne分散液质量浓度为90 mg/mL,炭化温度为800℃时,得到的Mx-Co/n-PCnFs比表面积为257.5 m^(2)/g;将其作为中间层组装的电池,在0.2 C倍率下,循环100圈后,仍具有971.5 mA·h/g的容量;1 C倍率长循环400圈后,每圈容量衰减仅为0.063%;在高硫负载(4 mg/cm^(2))、0.5 C下循环50圈后,容量仍保持在853 mA·h/g,优于不添加Mx.ne纳米片的中间层。

关键词：静电纺丝碳纳米纤维中间层 Mx.ne 锂硫电池

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三种改性方式对全谷物玉米粉营养成分及加工特性的影响

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食品与发酵工业 2024年第18期50卷 186-193页

作者：吴卓昊宋春丽董强任健齐齐哈尔大学食品与生物工程学院黑龙江齐齐哈尔161006 黑龙江省玉米主食工业化工程技术研究中心黑龙江齐齐哈尔161006 齐齐哈尔市检验检测中心黑龙江齐齐哈尔161005

该文研究了超微粉碎、挤压膨化、乳酸菌发酵3种改性方式对全谷物玉米粉营养成分与加工特性的影响,为不同改性玉米粉在不同主食产品中的潜在应用提供了理论依据。结果表明,3种改性粉中,超微粉碎粉的蛋白质含量(5.90%)、慢消化特性改善最... 详细信息

该文研究了超微粉碎、挤压膨化、乳酸菌发酵3种改性方式对全谷物玉米粉营养成分与加工特性的影响,为不同改性玉米粉在不同主食产品中的潜在应用提供了理论依据。结果表明,3种改性粉中,超微粉碎粉的蛋白质含量(5.90%)、慢消化特性改善最为显著,适合保留玉米原本营养、慢消化需求食品中添加;挤压膨化粉的持水力、持油力(5.16 g/g、1.22 g/g)、凝胶能力(3.24 g/g)、溶解度(7.5%)、弹性(2.62 mm)和胶黏性(1.03 n·mm)改善最为显著,适合冲调类、黏弹性高的食品中添加;发酵粉的淀粉含量(83.62%)、膨润力(6.43%)、灰分含量(0.44%)、弹性模量和黏性模量、粉体色泽改善最为显著,适合面制品中添加。该研究结果表明,3种不同方式改性的玉米粉在营养成分与加工特性方面存在显著差异,这为选择性地将全谷物玉米粉用于不同类型主食类食品提供理论依据与技术支撑。

关键词：超微粉碎挤压膨化乳酸菌发酵全谷物玉米粉加工特性

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Enhanced activation of peroxymonosulfate by Fe/n co-doped ordered mesoporous carbon with dual active sites for efficient removal of m-cresol

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Chinese Journal of Chemical Engineering 2024年第1期65卷 130-144页

作者： Donghui Li Wenzhe Wu xue Ren xixi Zhao Hongbing song Meng xiao Quanhong Zhu Hengjun Gai Tingting Huang College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China School of Chemical&Environmental Engineering China University of Mining&Technology-BeijingBeijing 100083China

The novel Fe-n co-doped ordered mesoporous carbon with high catalytic activity in m-cresol removal was prepared by urea-assisted impregnation and simple pyrolysis *** the preparation of the Fe-nC catalyst,the complexation of n elements in urea could anchor Fe,and the formation of C3n4during urea pyrolysis could also prevent migration and aggregation of Fe species,which jointly improve the dispersion and stability of *** Fen4sites and highly dispersed Fe nanoparticles synergistically trigger the dual-site peroxymonosulfate (PMS) activation for highly efficient m-cresol degradation,while the ordered mesoporous structure of the catalyst could improve the mass transfer rate of the catalytic process,which together promote catalytic degradation of m-cresol by PMS *** oxygen species (ROS) analytic experiments demonstrate that the system degrades m-cresol by free radical pathway mainly based on SO_(4)^(-)·and·OH,and partially based on·OH as the active components,and a possible PMS activation mechanism by 5Fe-50 for m-cresol degradation was *** study can provide theoretical guidance for the preparation of efficient and stable catalysts for the degradation of organic pollutants by activated PMS.

关键词： Degradation Peroxymonosulfate Fe(II)/Fe(III)/Fen4 Ordered mesopores carbon Catalyst Radical

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