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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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Phase behavior of gas condensate in porous media using real-time computed tomography scanning

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Petroleum Science 2024年第2期21卷 1032-1043页

作者： Wen-Long Jing Lei Zhang Ai-fen.Li Jun-Jie Zhong hai Sun yong-Fei Yang Yu-Long Cheng Jun Yao Institute of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina

The phase behavior of gas condensate in reservoir formations differs from that in pressure-volume-temperature(PVT)cells because it is influenced by porous media in the reservoir *** was used as a sample to investigate the influence of porous media on the phase behavior of the gas *** pore structure was first analyzed using computed tomography(CT)scanning,digital core technology,and a pore network *** sandstone core sample was then saturated with gas condensate for the pressure depletion *** each pressure-depletion state was stable,realtime CT scanning was performed on the *** scanning results of the sample were reconstructed into three-dimensional grayscale images,and the gas condensate and condensate liquid were segmented based on gray value discrepancy to dynamically characterize the phase behavior of the gas condensate in porous *** network models of the condensate liquid ganglia under different pressures were built to calculate the characteristic parameters,including the average radius,coordination number,and tortuosity,and to analyze the changing mechanism caused by the phase behavior change of the gas *** types of condensate liquid(clustered,branched,membranous,and droplet ganglia)were then classified by shape factor and Euler number to investigate their morphological changes dynamically and *** results show that the dew point pressure of the gas condensate in porous media is 12.7 MPa,which is 0.7 MPa higher than 12.0 MPa in PVT *** average radius,volume,and coordination number of the condensate liquid ganglia increased when the system pressure was between the dew point pressure(12.7 MPa)and the pressure for the maximum liquid dropout,Pmax(10.0 MPa),and decreased when it was below *** volume proportion of clustered ganglia was the highest,followed by branched,membranous,and droplet *** study provides crucial experimental evidence for the phase behavior chan

关键词： Gas condensate Pressure depletion Real-time micro-computed tomography scanning Distribution of condensate liquid

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Pulsations of Three Rapidly Oscillating Ap Stars TIC 96315731,TIC72392575,and TIC 318007796

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Research in Astronomy and Astrophysics 2024年第8期24卷 157-168页

作者： hai-Jian Zhong Dong-Xiang Shen Chun-Hua Zhu He-Lei Liu Su-fen.Guo Guo-Liang Lü School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China Xinjiang Astronomical Observatory National Astronomical ObservatoriesChinese Academy of SciencesUrumqi 830000China

We analyze the frequencies of three known roAp stars,TIC 96315731,TIC 72392575,and TIC 318007796,using the light curves from the Transiting Exoplanet Survey *** TIC 96315731,the rotational and pulsational frequencies are 0.1498360 day^(-1)and 165.2609 day^(-1),*** the case of TIC 72392575,the rotational frequency is 0.25551 day^(-1).We detect a quintuplet of pulsation frequencies with a center frequency of135.9233 day^(-1),along with two signals within the second pair of rotational sidelobes of the quintuplet separated by the rotation *** two signals may correspond to the frequencies of a dipole *** TIC318007796,the rotational and pulsational frequencies are 0.2475021 day^(-1),192.73995 day^(-1),and196.33065 day^(-1),*** on the oblique pulsator model,we calculate the rotation inclination(i)and magnetic obliquity angle(b)for the stars,which provide the geometry of the pulsation *** the phases of the frequency quintuplets,the pulsation amplitude and phase modulation curves,and the results of spherical harmonic decomposition,we conclude that the pulsation modes of frequency quintuplets in TIC96315731,TIC 72392575,and TIC 318007796 correspond to distorted dipole mode,distorted quadrupole mode,and distorted dipole mode,respectively.

关键词： asteroseismology-techniques photometric-stars oscillations(including pulsations)-stars chemically peculiar

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Enhanced hydrogen evolution performance by 3D ordered macroporous Ru-CoP@NC electrocatalysts

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Rare Metals 2024年第3期43卷 1095-1107页

作者： Chen-Chen Zhang Sheng Wei Li-Xian Sun Yi-Fang Ouyang fen.Xu hai-Liang Chu Hong-GePan Li-Xin Chen Xue-Zhang Xiao School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin541004China School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055GuangdongChina Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an710021China School of Materials Science and Engineering Zhejiang UniversityHangzhou310058China

Electrocatalytic water splitting coupled with sustainable energies is identified as an environmentally friendly and renewable strategy to generate high-quality hydrogen for the fuel ***,the main challenge is to develop high performance,low cost and chemically stable electrocatalysts to decline the energy barriers and enhance the sluggish kinetics of hydrogen evolution reaction(HER).Herein,a three-dimensional hierarchically ordered macroporous Ru-CoP@NC electrocatalyst(3DOM Ru-CoP@NC)derived from ordered macro-microporous metal-organic frameworks has been prepared using the precursor@template and double-solvent *** prepared 3DOM Ru-CoP@NC catalyst exhibits an overpotential of 15 mV(j=10 mA·cm^(-2))and a reaction Tafel slope of 38 mV·dec^(-1)in alkaline electrolyte,which are superior to commercial Pt@C ***,the overpotential and reaction Tafel slope of this catalyst in acidic media are 45 mV and 50 mV·dec^(-1),*** outstanding HER activities of 3DOM Ru-CoP@NC catalysts are ascribed to the 3D highly interconnectedreticular nanospaces that can increase effective reaction active *** N dope d carbon framework improves the electronic properties and ***,the strong interaction of Ru and CoP nanoparticles also boosts the HER *** results indicate that 3DOM Ru-CoP@NC catalysts with high catalytic activities have a broad application prospect in the future.

关键词： Hydrogen evolution reaction Template method 3D ordered macroporous Ru-CoP@NC

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Investigation of the quality of life,mental status in patients with gynecological cancer and its influencing factors

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World Journal of Psychiatry 2024年第7期14卷 1053-1061页

作者： hai-Xia Shang Wen-Ting Ning Jin-fen.Sun Nan Guo Xin Guo Jan-Nan Zhang Hong-Xin Yu Su-Hui Wu Department of Gynaecology and Obstetrics The Third Hospital of Shanxi Medical UniversityShanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalTaiyuan 030032Shanxi ProvinceChina

BACKGROUND Having a gynecological tumor or undergoing treatment can be a traumatic experience for women,as it affects their self-image and sexual relationships and can lead to psychological *** adjustment following cancer occurrence remains a key issue among the *** To examine the current status of quality of life(QoL),anxiety,and depression in patients with gynecological cancer and to analyze the factors associated with *** Data for 160 patients with gynecological malignancies treated at Shanxi Bethune Hospital from June 2020 to June 2023 were collected and analyzed ***’QoL was assessed using the European Organization for Research on Treatment of Cancer Quality of Life Questionnaire Core 30 and the Functional Assessment of Cancer Therapy-General *** emotional status was evaluated using the Self-Rating Anxiety/Depression *** associated factors of anxiety and depression were *** The overall QoL score of the patients 6 months after surgery was 76.39±3.63 *** included low levels of social and emotional function and severe fatigue and *** scores for physiological,functional,emotional,social,and family well-being exhibited an upward trend following surgery compared with those before *** month after surgery,some patients experienced anxiety and depression,with an incidence of 18.75%and 18.13%,*** analysis revealed that good sleep was a protective factor against anxiety and depression in patients with gynecological tumors,whereas physical pain was a risk *** Patients with gynecological malignancies often experience anxiety and *** analyzing the factors that affect patients’QoL,effective nursing measures can be administered.

关键词： Gynecological Tumors Quality of life Anxiety Depression

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Design and prototyping of the readout electronics for the transition radiation detector in the high energy cosmic radiation detection facility

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Nuclear Science and Techniques 2024年第4期35卷 189-199页

作者： Jie-Yu Zhu Yang-Zhou Su hai-Bo Yang fen.Hua Lu Yan Yang Xi-Wen Liu Ping Wei Shu-Cai Wan Hao-Qing Xie Xian-Qin Li Cong Dai Hui-Jun Hu Hong-Bang Liu Shu-Wen Tang Cheng-Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

The high energy cosmic-radiation detection(HERD)facility is planned to launch in 2027 and scheduled to be installed on the China Space *** serves as a dark matter particle detector,a cosmic ray instrument,and an observatory for high-energy gamma rays.A transition radiation detector placed on one of its lateral sides serves dual purpose,(ⅰ)calibrating HERD's electromagnetic calorimeter in the TeV energy range,and(ⅱ)serving as an independent detector for high-energy gamma *** this paper,the prototype readout electronics design of the transition radiation detector is demonstrated,which aims to accurately measure the charge of the anodes using the SAMPA application specific integrated circuit *** electronic performance of the prototype system is evaluated in terms of noise,linearity,and *** the presented design,each electronic channel can achieve a dynamic range of 0–100 fC,the RMS noise level not exceeding 0.15 fC,and the integral nonlinearity was<0.2%.To further verify the readout electronic performance,a joint test with the detector was carried out,and the results show that the prototype system can satisfy the requirements of the detector's scientific goals.

关键词： HERD Dark matter particle detection TRD Readout electronics SAMPA Data acquisition Performance test

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组织势视角下企业资源重构如何驱动高端化战略变革——基于飞鹤乳业的纵向单案例研究

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经济管理 2024年第1期46卷 91-110页

作者：林海芬海淼大连理工大学经济与管理学院辽宁大连116024 大连理工大学平台治理研究院辽宁大连116024

在中国企业成长过程中,一部分优秀企业将高端化战略变革作为突破低端锁定的重要实现方式。从现实来看,中国企业高端化战略变革多源于内部资源困境嵌套外部合法性不足的“逆势”情境,其成功的关键在于转“逆势”为“顺势”并塑造所需竞... 详细信息

在中国企业成长过程中,一部分优秀企业将高端化战略变革作为突破低端锁定的重要实现方式。从现实来看,中国企业高端化战略变革多源于内部资源困境嵌套外部合法性不足的“逆势”情境,其成功的关键在于转“逆势”为“顺势”并塑造所需竞争优势。本文立足组织势与资源重构相互作用的视角,以飞鹤乳业为案例探究这一相互作用如何促进企业实现高端化战略变革的过程,丰富了组织势内涵,构建了组织势与资源重构的相互作用机制,并挖掘其促进企业高端化战略变革实现的过程机理。研究发现,组织势是组织沿内部发展惯性和外部环境惯性的方向持续发展的趋势。企业依据组织势(内部力量和外部环境状态)的演化,可将高端化战略变革过程分为“造势-借势-顺势”三阶段,并因“势”制宜,通过协同混合、内部重构模式,依次构建起“补偿重构”“整合重构”“聚焦重构”的组合型资源重构机制。进一步地,三种组合型资源重构机制通过主动塑造企业内外部组织势,不仅逐步转“逆势”为“顺势”,营造有助于实现高端化战略变革的内外部情境,而且多模式的同时作用满足了变革的多重资源需求,逐渐构建了高端化战略变革所需的竞争优势。

关键词：高端化战略变革资源重构组织势纵向单案例研究

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铝对马尾松菌根化幼苗抗逆生理和根尖细胞超微结构的影响

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林业科学研究 2024年第1期37卷 21-30页

作者：刘海燕李快芬陈后英丁贵杰贵州大学贵州省森林资源与环境研究中心/贵州省高原山地林木培育重点实验室/林学院贵州贵阳550025 贵州省植物园贵州贵阳550004 贵州省国有龙里林场贵州黔南558000 国家林业和草原局西南喀斯特山地生物多样性保护重点实验室贵州贵阳550004

[目的]不同Al^(3+)水平下,研究马尾松菌根/非菌根幼苗的生理、根尖细胞超微结构的变化以及Al的亚细胞分布,分析菌根化苗木对铝的响应及其耐铝性,为外生菌根真菌提高寄主植物耐铝性和育苗造林应用提供理论依据。[方法]以半年生菌根和非... 详细信息

[目的]不同Al^(3+)水平下,研究马尾松菌根/非菌根幼苗的生理、根尖细胞超微结构的变化以及Al的亚细胞分布,分析菌根化苗木对铝的响应及其耐铝性,为外生菌根真菌提高寄主植物耐铝性和育苗造林应用提供理论依据。[方法]以半年生菌根和非菌根马尾松苗为材料,采用砂培盆栽浇铝法,分别设置0、0.2、0.4、0.8mmol·L^(-1) Al^(3+)(AlCl_(3))处理,分析其根系抗氧化酶活性和MDA含量等生理指标变化,Al的亚细胞分布,通过组织染色观察根尖ROS和MDA分布,并观察根尖超微结构变化。[结果](1)随外源[Al^(3+)]的升高,马尾松菌根/非菌根苗根系SOD、CAT、POD活性和MDA含量均呈总体上升趋势,在高铝(0.8 mmol·L^(-1))水平时,抗氧化酶活性和MDA含量最大,且非菌根苗受到铝的影响程度更大;(2)随外源[Al^(3+)]的升高,马尾松根尖吸收的铝含量显著增加,且菌根苗吸收的铝含量显著高于非菌根苗;(3)从细胞超微结构和Al的亚细胞分布看,大量Al^(3+)首先与细胞壁结合,细胞内的Al^(3+)与生物膜强烈结合,使细胞器物质向外渗漏作用加强,干扰细胞核和线粒体等的各种调节过程。而由于菌根对铝的吸附作用,降低了侵入细胞内的铝离子含量,保护亚细胞器结构的同时也维持了细胞的基本功能,从而缓解铝毒性。[结论]铝处理使马尾松根系抗氧化酶活性和MDA含量增加,0.4 mmol·L^(-1)以上的铝浓度产生明显铝毒害症状。而菌根可以通过吸收更多的铝降低铝毒害,并提高植物耐铝能力,这很可能是马尾松菌根苗的一个重要外部抗性机制。

关键词：菌根马尾松耐铝性抗氧化酶细胞超微结构亚细胞分布

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高职院校道桥专业群数字化升级探索

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湖北开放职业学院学报 2024年第18期37卷 174-176页

作者：刘建李海粉河南交通职业技术学院河南郑州450000 郑州旅游职业学院河南郑州450000

交通类高职院校为适应区域产业发展对复合型高技能人才的需要,建立以道路与桥梁工程技术专业为核心,联合道路工程造价、道路养护与管理、道路工程检测等相近专业组成的道桥专业群。随着数字时代的到来,数字技术的快速发展让道桥专业群... 详细信息

交通类高职院校为适应区域产业发展对复合型高技能人才的需要,建立以道路与桥梁工程技术专业为核心,联合道路工程造价、道路养护与管理、道路工程检测等相近专业组成的道桥专业群。随着数字时代的到来,数字技术的快速发展让道桥专业群建设得到了新的动力。本文从社会需要、行业需求和专业群自身建设三个方面分析了道桥专业群数字化升级的必要性,从教学参与者、教学资源、教学环境、教学管理和BIM教学五个方面提出了道桥专业群数字化升级的路径。

关键词：道桥专业群数字技术升级路径

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第一性原理研究压力对Fe_(2)B的结构、机械性质的影响

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原子与分子物理学报 2024年第2期41卷 105-111页

作者：李海侠刘钧黄上分陶钧桂林理工大学机械与控制工程学院桂林541006

基于密度泛函理论的第一性原理方法,系统研究了0~30 GPa压力下四方相Fe_(2)B的结构,稳定性和力学性质等.随着压力的增加,计算得到的晶格参数逐渐减小,所有结构均满足热力学稳定性,体积模量和剪切模量逐渐增大,韧性得到有效改善.硬度呈... 详细信息

基于密度泛函理论的第一性原理方法,系统研究了0~30 GPa压力下四方相Fe_(2)B的结构,稳定性和力学性质等.随着压力的增加,计算得到的晶格参数逐渐减小,所有结构均满足热力学稳定性,体积模量和剪切模量逐渐增大,韧性得到有效改善.硬度呈现先增大后减小的趋势,并在18 GPa压力时达到最大值,各向异性先增大后减小.德拜温度变化趋势与杨氏模量的变化趋势相同.同时还研究了相变结构——正交相的相关性质,结果表明其结构满足热力学稳定性但不满足力学稳定性,是否稳定存在还需要进行后续实验研究.

关键词：第一性原理 Fe_(2)B 压力晶体结构机械性能

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