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Enhanced Crystallization of Poly(butylene adipate-co-terephthalate)by a Self-assembly Nucleating Agent

chinese Journal of Polymer Science 2024年第5期42卷 663-674,I0010页

作者： Cheng Zhou Kun Chen Zi-heng Zhang Meng-Fan Jing Chun-Tai Liu Chang-yu Shen Ya-Ming Wang State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China

Poly(butylene adipate-co-terephthalate)(PBAT)is a promising biodegradable flexible polymer but suffers from slow crystallization rate,making it less attractive for some applications like the injection-molded products in comparison with low-density polyethylene(LDPE).This work aimed to accelerate the crystallization of PBAT by adding a self-assembly nucleating agent octamethylenedicarboxylic dibenzoylhydrazide(OMBH).PBAT/OMBH composites with various OMBH contents(0 wt%,0.5 wt%,0.7 wt%,1 wt%,2 wt%,3 wt%and 5 wt%)were prepared through *** effect of OMBH on the crystallization behavior,morphologies and mechanical properties of PBAT was *** highest nucleation efficiency value of 59.6%was achieved for PBAT with 0.7 wt%OMBH,much higher than that of 22.7%for PBAT with 0.7 wt%*** force microscopy results showed that OMBH formed fine fibers and induced the formation of transcrystalline layers of *** transform infrared spectroscopy(FTIR)combined with two-dimensional correlation spectra suggested that the intermolecular dipole-dipole N—H…O=C interactions but not hydrogen bond between OMBH and PBAT promoted the crystallization of PBAT in the initial period of *** presence of OMBH did not change the crystal form of PBAT but had positive contribution in enhancing its crystallinity and mechanical *** work is essential for preparing PBAT with high crystallization rate,enhancing its potential applications in injection-molded products.

关键词： Poly(butylene adipate-co-terephthalate) Biodegradable Self-assembly nucleating agent Crystallization

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Research on Track Fastener Service Status Detection Based on Improved Yolov4 Model

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Journal of Transportation Technologies 2024年第2期14卷 212-223页

作者： Jing he Weiqi Wang Nengpu Yang College of Electrical and Information Engineering Hunan University of Technology Zhuzhou Hunan College of Railway Transportation Hunan University of Technology Zhuzhou Hunan

As an important part of railway lines, the healthy service status of track fasteners was very important to ensure the safety of trains. The application of deep learning algorithms was becoming an important method to realize its state detection. However, there was often a deficiency that the detection accuracy and calculation speed of model were difficult to balance, when the traditional deep learning model is used to detect the service state of track fasteners. Targeting this issue, an improved Yolov4 model for detecting the service status of track fasteners was proposed. Firstly, the Mixup data augmentation technology was introduced into Yolov4 model to enhance the generalization ability of model. Secondly, the MobileNet-V2 lightweight network was employed in lieu of the CSPDarknet53 network as the backbone, thereby reducing the number of algorithm parameters and improving the model’s computational efficiency. Finally, the SE attention mechanism was incorporated to boost the importance of rail fastener identification by emphasizing relevant image features, ensuring that the network’s focus was primarily on the fasteners being inspected. The algorithm achieved both high precision and high speed operation of the rail fastener service state detection, while realizing the lightweight of model. The experimental results revealed that, the MAP value of the rail fastener service state detection algorithm based on the improved Yolov4 model reaches 83.2%, which is 2.83% higher than that of the traditional Yolov4 model, and the calculation speed was improved by 67.39%. Compared with the traditional Yolov4 model, the proposed method achieved the collaborative optimization of detection accuracy and calculation speed.

关键词： Yolov4 Model Service Status of Track Fasteners Detection and Recognition Data Augmentation Lightweight Network Attention Mechanism

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Photocatalytic degradation of enrofloxacin with CoAl-LDH mediated persulfate system:Efficiency evaluations and reaction pathways

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Emerging Contaminants 2024年第3期10卷 280-292页

作者： yuxuan Zhang Kai he Long Chen Wen Liu c Jinlong yuan Yaotong Gao yuanfeng Qi Bingjun Liu School of Civil Engineering Sun Yat-Sen UniversityZhuhai519082PR China Guangdong Provincial Key Laboratory for Marine Civil Engineering Zhuhai519082PR China College of Environmental Sciences and Engineering Peking UniversityBeijing100871PR China School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao266000PR China

Residual enrofloxacin(ENR)exposed in aqueous environments is challenging to the *** this work,a layered double hydroxide CoAl-LDH was used to activate the common oxidizing agent persulfate(PS)for photodegradation of ENR,and the degradation pathways of ENR were scrutinized and *** results indicated that,under the optimal conditions obtained through orthogonal experiments,even though the degradation rate of ENR was as high as 97.72%,the removal of total organic carbon(TOC)from the system was only about 30%.Eleven probable reaction pathways were categorized,and thirty-one types of intermediates were identified in participating in the complex degradation *** major products of ENR were P4(C_(17)H_(20)FN_(3)O_(3)),P22(C_(19)H_(22)FN_(3)O_(4)),P19(C_(17)H_(18)FN_(3)O_(3)),which are mainly derived from the cleavage of the piperazine groups and quinolone *** functional theory(DFT)calculations of the Fukui index for ENR revealed that the two N atoms in the piperazine ring were the core reactive sites in triggering the degradation chains,which were sensitive for electrophilic attack by the dominant radicals(·OH and SO_(4)·^(-))generated from the composite PS-UV-CoAl-LDH system.

关键词： Layered double hydroxide Persulfate Enrofloxacin Degradation pathway Density functional theory

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Cadaverine and putrescine exposure influence carbon and nitrogen cycling genes in water and sediment of the Yellow River

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Journal of Environmental Sciences 2024年第8期142卷 236-247页

作者： Wanghong Su Qiaoling yu Jiawei Yang Qian Han Sijie Wang Petr hedenec Xiaochen Wang Ruijun Wan-Yan Huan Li School of Public health Lanzhou UniversityLanzhou 730000China 2 Institute for Tropical Biodiversity and Sustainable DevelopmentUniversity Malaysia Terengganu21030Kuala NerusTerengganuMalaysia State Key Laboratory of Grassland Agro-ecosystems Center for Grassland MicrobiomeCollege of pastoral agriculture science and technology Lanzhou UniversityLanzhou 730000China

The response patterns of microbial functional genes involved in biogeochemical cycles to cadaver decay is a central topic of recent environmental ***,the response mechanisms and pathways of the functional genes associated with the carbon(C)and nitrogen(N)cycling to cadaveric substances such as cadaverine and putrescine remain *** study explored the variation of functional genes associated with C fixation,C degradation and N cycling and their influencing factors under cadaverine,putrescine and mixed *** results showed only putrescine significantly increased the alpha diversity of C fixation genes,while reducing the alpha diversity of N cycling genes in *** the C cycling,the mixed treatment significantly decreased the total abundance of reductive acetyl-CoA pathway genes(i.e.,acsB and acsE)and lig gene linked to lignin degradation in water,while only significantly increasing the hydroxypropionate-hydroxybutylate cycle(i.e.,accA)gene abundance in *** the N cycling,mixed treatment significantly decreased the abundance of the nitrification(i.e.,amoB),denitrification(i.e.,nirS3)genes in water and the assimilation pathway gene(i.e.,gdhA)in *** factors(i.e.,total carbon and total nitrogen)were all negatively associated with the genes of C and N ***,cadaverine and putrescine exposure may inhibit the pathway in C fixation and N cycling,while promoting C *** findings can offer some new insight for the management of amine pollution caused by animal cadavers.

关键词： Carbon cycling Nitrogen cycling Cadaverine Putrescine Pollution management

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The Deconvolution Method for Obtaining Correspondence in Data-Independent Acquisition Mass Spectrometry Data

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Journal of Computer and Communications 2024年第2期12卷 11-25页

作者： Mingming Lyu Xinye Bian Changjiu he College of Computer Science and Technology Shandong University of Technology Zibo China

Although data-independent acquisition (DIA) shows powerful potential in achieving comprehensive peptide information acquisition, the difficulty in determining the precursor m/z and distinguishing fragment ions has posed challenges in DIA data analysis. To address this challenge, a common approach is to recover the correspondence between precursor ions and fragment ions, followed by peptide identification using traditional data-dependent acquisition (DDA) database searching. In this study, we propose a cosine similarity-based deconvolution method that rapidly establishes the correspondence between chromatographic profiles of precursor ions and fragment ions through matrix calculations. Experimental results demonstrate that our method, referred to as CosDIA, yields a peptide identification count close to that of DIA-umpire. However, compared to DIA-umpire, we can establish the correspondence between original MS/MS spectra and pseudo-MS/MS spectra. Furthermore, compared to the CorrDIA method, our approach achieves higher efficiency in terms of time, reducing the time cost of the analysis process. These results highlight the potential advantages of the CosDIA method in DIA data analysis, providing a powerful tool and method for large-scale proteomics research.

关键词： MS/MS Spectra XICs Correspondence Matrix Isotopic Peak Cluster

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不同风场中特高压换流站阀厅屋盖风压特性试验研究

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振动与冲击 2024年第2期43卷 146-155页

作者：汪之松王宇杰余波徐晴何勇李正良重庆大学土木工程学院重庆400045 重庆大学山地城镇建设与新技术教育部重点实验室重庆400045 中国电力工程顾问集团西南电力设计院有限公司成都610021

特高压(ultra high voltage,UHV)换流站阀厅的金属屋面系统在风荷载作用下易发生屋面表层风揭事故。为深入探讨该类建筑屋面的风压极值特性,基于风洞试验分别探讨了大气边界层(atmospheric-boundary-layer,ABL)风、壁面射流、均匀湍流... 详细信息

特高压(ultra high voltage,UHV)换流站阀厅的金属屋面系统在风荷载作用下易发生屋面表层风揭事故。为深入探讨该类建筑屋面的风压极值特性,基于风洞试验分别探讨了大气边界层(atmospheric-boundary-layer,ABL)风、壁面射流、均匀湍流三种风场作用下的屋面风压特性,比较了平均风剖面、风速、风向、湍流强度等因素对屋面风压的影响。结果表明:阀厅屋盖迎风前缘负风压最大,且控制风向角在45°左右;壁面射流风场下平均风压系数与脉动风压系数均超过大气边界层风场的结果;风速对阀厅屋盖的负风压系数均值和极值影响较小,而湍流度对风压系数的极值影响较大;大气边界风场时,JGJ/T 481—2019《屋盖结构风荷载标准》的最不利风压系数建议值偏于安全;而在壁面射流风场下,阀厅屋盖全风向最不利风压系数在所有区域都大于JGJ/T 481—2019的建议值,设计中应加以重视。

关键词：特高压(UHV)换流站阀厅屋盖大气边界层(ABL)风壁面射流均匀湍流极值风压系数

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Corrosion-Resistant Polymer-Derived SiOC Membrane for Effective Organic Removal via Synergistic Adsorption and Peroxymonosulfate Activation

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Transactions of Tianjin University 2024年第3期30卷 238-249页

作者： Jiankun Ji Yarong Gu Jianning Zhang Chongwen yu Xiao Hu yueping Bao yujie Song School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications Ningbo Key Laboratory of Special Energy Materials and ChemistryCenter for Advanced Organosilicon PrecursorsNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Qianwan Institute of CNITECH Ningbo 315336China University of chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore College of Environmental Science and Engineering Nankai UniversityTianjin 300350China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516029China

A major challenge is to construct ceramic membranes with tunable structures and functions for water ***,a novel corrosion-resistant polymer-derived silicon oxycarbide(SiOC)ceramic membrane with designed architectures was fabricated by a phase separation method and was applied in organic removal via adsorption and oxidation for the first *** pore structure of the as-prepared SiOC ceramic membranes was well controlled by changing the sintering temperature and polydimethylsiloxane content,leading to a pore size of 0.84–1.62μm and porosity of 25.0–43.8%.Corrosion resistance test results showed that the SiOC membranes sustained minimal damage during 24 h exposure to high-intensity acid–base conditions,which could be attributed to the chemical inertness of *** rhodamine 6G(R6G)as the model pollutant,the SiOC membrane demonstrated an initial eff ective removal rate of 99%via adsorption;however,the removal rate decreased as the system approached adsorption *** peroxymonosulfate was added into the system,efficient and continuous degradation of R6G was observed throughout the entire period,indicating the potential of the as-prepared SiOC membrane in oxidation-related ***,this work provides new insights into the construction of novel polymer-derived ceramic membranes with well-defined structures and functions.

关键词： Polymer-derived ceramics Membrane Corrosion resistance Adsorption Oxidation

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基于RSM-BBD的多源煤基固废胶结体配比及性能研究

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材料导报 2024年第9期38卷 149-155页

作者：赵新元杨科何祥魏祯于祥张继强安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室安徽淮南232001 安徽理工大学矿业工程学院安徽淮南232001 合肥综合性国家科学中心能源研究院(安徽省能源实验室) 合肥230000

本工作采用响应面法(RSM)Box-Behnken Design(BBD)模式对脱硫石膏、气化细渣和炉底渣等多源煤基固废进行配比优选,并研究了最优配比胶结体的力学性能、孔隙结构、热稳定性、微观结构等特性。结果表明:(1)气化细渣掺量对胶结体的1 d强度... 详细信息

本工作采用响应面法(RSM)Box-Behnken Design(BBD)模式对脱硫石膏、气化细渣和炉底渣等多源煤基固废进行配比优选,并研究了最优配比胶结体的力学性能、孔隙结构、热稳定性、微观结构等特性。结果表明:(1)气化细渣掺量对胶结体的1 d强度影响最大,脱硫石膏掺量对胶结体3 d和7 d强度影响最大,两种固废的交互作用对胶结体早期强度影响最显著,表现为负效应;在粉煤灰与矸石质量比为0.4∶1和质量浓度为80%的条件下,获得脱硫石膏、气化细渣和炉底渣的最优质量比为0.2∶0.1∶0.1,并分析了最优配比胶结体的压缩变形和破坏特征。(2)研究了胶结体的微观特性:胶结体内存在密集细颈型封闭孔隙,孔直径范围在5~3.7×10^(5) nm,微孔较少,以中、大孔为主;胶结体在55~65℃和90~120℃区间出现游离水和结晶水的吸热脱水反应,在600~700℃区间出现结构水、羟基水的脱除和水化产物的分解,在800℃累计失重约8%。(3)煤基固废胶结体的水化反应以水泥为主,固废之间未发生化学反应,水化产物为少量短杆状钙矾石相和薄层绒状C-S-H凝胶;钙矾石中少量Al^(3+)被Si^(4+)取代,少量SO_(4)^(2-)被CO_(3)^(2-)取代。

关键词：煤基固废胶结充填体响应面法配比优化微观特性

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Nitrogen-doped titanium dioxide/schwertmannite nanocomposites as heterogeneous photo-Fenton catalysts with enhanced efficiency for the degradation of bisphenol A

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Journal of Environmental Sciences 2024年第9期143卷 1-11页

作者： Xing-Xing Qiao yu-Hang Xu Xiang-Ji Liu Sai-Le Chen Zhou Zhong Ya-Feng Li Jian Lü Fujian Provincial Key Laboratory of Soil Environmental health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Potential health risks related to environmental endocrine disruptors(EEDs)have aroused research hotspots at the forefront of water treatment ***,nitrogen-doped titanium dioxide/schwertmannite nanocomposites(N-TiO_(2)/SCH)have been successfully developed as heterogeneous catalysts for the degradation of typical EEDs via photo-Fenton *** to the sustainable Fe(Ⅲ)/Fe(Ⅱ)conversion induced by photoelectrons,as-prepared N-TiO_(2)/SCH nanocomposites exhibit much enhanced efficiency for the degradation of bisphenol A(BPA;ca.100% within 60 min under visible irradiation)in a wide pH range of 3.0-7.8,which is significantly higher than that of the pristine schwertmannite(ca.74.5%)or N-TiO_(2)(ca.10.8%).In this photo-Fenton system,the efficient degradation of BPA is mainly attributed to the oxidation by hydroxyl radical(·OH)and singlet oxygen(^(1)O_(2)).Moreover,the possible catalytic mechanisms and reaction pathway of BPA degradation are systematically investigated based on analytical and photoelectrochemical *** work not only provides a feasible means for the development of novel heterogeneous photo-Fenton catalysts,but also lays a theoretical foundation for the potential application of mineral-based materials in wastewater treatment.

关键词： Titanium dioxide Schwertmannite Fenton reaction Environmental endocrine disruptors Photocatalysis

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基于AMEsim的多金属结核扬矿泵管紧急排料机构超长液压油管参数设计

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矿冶工程 2024年第3期44卷 1-5页

作者：李俊张弛程阳锐戴瑜长沙矿冶研究院有限责任公司深海矿产资源开发利用技术国家重点实验室湖南长沙410012 中国五矿集团有限公司北京100010 中南大学湖南长沙410083

针对深海多金属结核扬矿泵管系统海上试验时可能存在的紧急排料需求,开展了海上试验系统紧急排料机构液压系统理论计算,并在AMEsim中进行了仿真试验,结果表明,AMEsim仿真软件对于该系统的可信度系数为0.86。基于AMEsim构建了500 m海上... 详细信息

针对深海多金属结核扬矿泵管系统海上试验时可能存在的紧急排料需求,开展了海上试验系统紧急排料机构液压系统理论计算,并在AMEsim中进行了仿真试验,结果表明,AMEsim仿真软件对于该系统的可信度系数为0.86。基于AMEsim构建了500 m海上试验执行机构液压系统模型,仿真分析结果表明,液压系统中油管管径为16 mm,设定压力应不低于10.47 MPa,执行机构动作时间为6 s。研究结果可为紧急排料机构的设计提供依据。

关键词：深海采矿液压系统 AMEsim 长管路多金属结核扬矿泵管紧急排料机构

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