检索结果-南通市图书馆

聚多巴胺/壳聚糖改性棉织物的茶色素染色及其抗菌和防紫外线性能

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

纺织学报 2024年第3期45卷 106-113页

作者：李丽丽袁亮唐雨霞杨文菊王浩安徽农业大学材料与化学学院安徽合肥230036 马鞍山市纤维检验所安徽马鞍山243011

为提高棉织物的天然色素染色性和多功能性,利用CuSO_(4)/h_(2)O_(2)氧化体系下多巴胺(DA)在织物表面快速聚合沉积后,采用壳聚糖(CS)整理制备聚多巴胺/壳聚糖(PDA/CS)改性棉织物,再用茶色素对其进行染色处理。探究了DA快速聚合沉积过程... 详细信息

为提高棉织物的天然色素染色性和多功能性,利用CuSO_(4)/h_(2)O_(2)氧化体系下多巴胺(DA)在织物表面快速聚合沉积后,采用壳聚糖(CS)整理制备聚多巴胺/壳聚糖(PDA/CS)改性棉织物,再用茶色素对其进行染色处理。探究了DA快速聚合沉积过程中各因素对改性棉织物染色性能的影响,得到较佳工艺条件:CuSO_(4)浓度为3 mmol/L,DA质量浓度为2.0 mg/mL,h_(2)O_(2)浓度为13 mmol/L,沉积时间为2 h。在此条件下,PDA/CS改性棉织物染色后的k/S值达到6.21。研究结果表明:CuSO_(4)/h_(2)O_(2)氧化体系下DA在棉织物表面形成PDA层,可与CS产生氢键作用在织物表面均匀成膜;茶色素染色PDA/CS改性棉织物的耐摩擦色牢度、耐皂洗色牢度(沾色)和耐人造光色牢度均达到4级及以上;PDA/CS改性织物染色后的UPF值为312,对金黄色葡萄球菌与大肠杆菌的抑菌率达到90%以上,具备抗菌和防紫外线的双重功效。

关键词：棉织物聚多巴胺壳聚糖茶色素染色天然染料功能整理

纳米C-S-h-PCE对免蒸养高强混凝土性能的影响

在线全文

学校读者我要写书评

暂无评论

复合材料学报 2024年第1期41卷 333-347页

作者：付华王鹏刚田砾唐兴滨赵铁军青岛理工大学土木工程学院青岛266520 青岛市政集团砼业工程有限公司青岛266231

针对蒸汽养护易引起混凝土初始损伤及耐久性差等问题。本文采用纳米水化硅酸钙-聚羧酸醚复合材料(n-C-S-h-PCE)制备免蒸养高强混凝土。通过水化热、低场核磁等试验研究了n-C-S-h-PCE对混凝土抗压强度、水化速率、孔径分布、自收缩及耐... 详细信息

针对蒸汽养护易引起混凝土初始损伤及耐久性差等问题。本文采用纳米水化硅酸钙-聚羧酸醚复合材料(n-C-S-h-PCE)制备免蒸养高强混凝土。通过水化热、低场核磁等试验研究了n-C-S-h-PCE对混凝土抗压强度、水化速率、孔径分布、自收缩及耐久性的影响。结果表明:纳米水化硅酸钙(C-S-h)晶核为水化产物提供了成核位点,降低了成核的临界离子浓度k_(sp),诱导期和加速期显著提前,显著提高了混凝土早期抗压强度,1天混凝土抗压强度提高64%,且28天以后混凝土没有发生强度倒缩。掺入n-C-S-h-PCE后,混凝土基体孔径细化,凝胶孔和毛细孔比例均增加,导致混凝土自干燥过程中毛细孔负压增大,增大混凝土自收缩;然而,混凝土基体的最可几孔径和50~100 nm孔隙累计体积降低,提高了混凝土的抗氯离子侵蚀性能;孔径大于14 nm(临界孔径)的孔隙含量降低(由0.0287 mL/g降低到0.0156 mL/g),从而提高了混凝土的抗冻性能;此外,掺入n-C-S-h-PCE后,混凝土孔隙率降低,且随着矿粉掺量的增加,铝酸钙相和Ca2+的浓度降低,混凝土抗硫酸盐侵蚀能力提高。该研究为免蒸养、低收缩、高耐久、高强混凝土制备与应用提供了理论依据。

关键词：纳米早强剂免蒸养混凝土孔结构自收缩耐久性 C-S-h-PCE

Cu(110)晶面催化还原CO_(2)制备甲酸机理的第一性原理研究

在线全文

学校读者我要写书评

暂无评论

功能材料 2024年第4期55卷 4102-4110页

作者：张旭昀汤静常庆王勇谭秀娟东北石油大学机械科学与工程学院黑龙江大庆163000

铜基催化剂是一种高效还原CO_(2)为甲酸的绿色催化剂,明确不同晶面的还原机理对催化剂的设计及开发具有重要指导意义,但Cu(110)晶面的催化机理尚不明确。采用基于密度泛函理论的第一性原理方法对Cu(110)表面的还原机理进行了研究,系统... 详细信息

铜基催化剂是一种高效还原CO_(2)为甲酸的绿色催化剂,明确不同晶面的还原机理对催化剂的设计及开发具有重要指导意义,但Cu(110)晶面的催化机理尚不明确。采用基于密度泛函理论的第一性原理方法对Cu(110)表面的还原机理进行了研究,系统研究了不同中间产物的吸附相关性质并探讨了相关的吸附机理。吸附能结果表明,CO_(2)在Cu(110)表面无法发生化学吸附,而^(*)COOh、^(*)hCOO、hCOOh分子和h原子的最稳定吸附位点分别为长桥位点、短桥位点、顶位点和hCP位点。布居数结果表明,^(*)hCOO和hCOOh分子在吸附过程中与Cu(110)表面的Cu原子形成离子键,h原子和Cu原子之间存在氢键作用,^(*)COOh分子中的C和Cu原子形成共价键。此外,电子态密度结果表明^(*)hCOO基团和Cu原子之间形成O—Cu键,^(*)COOh基团中的C和Cu原子形成C—Cu键,hCOOh分子中的O和Cu原子形成O—Cu键。相比于^(*)COOh/Cu(110)体系,^(*)hCOO/Cu(110)吸附体系的电荷密度、电荷转移量和成键能力均较强,说明CO_(2)在Cu(110)还原过程中中间体^(*)hCOO更稳定,合成路径属于更加高效的:CO_(2)→^(*)hCOO→hCOOh路径。

关键词：电催化二氧化碳还原甲酸第一性原理铜基催化剂

The proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2) single-atom catalysts

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第1期17卷 397-406页

作者： Danfeng Wu Shuyun Zhou Congcong Du Juan Li Jianyu huang hong-xia Shen Abhaya k.Datye Shan Jiang Jeffrey T.Miller Sen Lin haifeng Xiong State key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China College of Biology and Chemical Engineering Jiaxing UniversityJiaxing 314000China Department of Chemical&Biological Engineering University of New MexicoAlbuquerqueNM 8731-0001USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907-2100USA Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IkkEM) Xiamen 361102China Fujian key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyan 366300China

The local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).however,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional ***,we prepared two Rh1/CeO_(2)SACs(0.5Rh1/r-CeO_(2)and 0.5Rh1/c-CeO_(2),respectively)using two shaped CeO_(2)(rod and cube)exposing different facets,i.e.,CeO_(2)(111)and CeO_(2)(100).In CO oxidation reaction,the T100 of 0.5Rh1/r-CeO_(2)SACs is 120°C,while the T100 of 0.5Rh1/c-CeO_(2)SACs is as high as 200°*** in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),we found that the proximity between Oh group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2)SAC system in CO *** Rh single atom trapped at the CeO_(2)(111)crystal surface forms the Rh1(Oh)adjacent species,which is not found on the CeO_(2)(100)crystal surface at room ***,during CO oxidation,the Oh group far from Rh single atom on the 0.5Rh1/c-CeO_(2)disappears and forms Rh1(Oh)adjacent species when the temperature is above 150°*** formation of Rh1(Oh)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2)*** formed Rh1(Oh)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°*** functional theory(DFT)calculations validate the unique activity and reaction path of the intermediate Rh1(Oh)adjacentCO species *** work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis.

关键词： crystal plane Rh1/CeO_(2)single-atom catalyst proximity of Rh and hydroxyl coordination structure CO oxidation

基于羟醛缩合反应构建电中性中空纤维疏松纳滤分离层及染料去除的研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

膜科学与技术 2024年第2期44卷 125-133页

作者：汤申艺武彪崔振宇天津工业大学材料科学与工程学院天津300387 天津天一爱拓科技有限公司天津300382

以聚偏氟乙烯(PVDF)/苯乙烯-马来酸酐(SMA)中空纤维超滤膜为基膜,在膜表面依次引入三乙二醇(TEG)、戊二醛(GA)、聚乙烯醇(PVA)3种亲水有机物,基于羟醛缩合反应在膜表面构建了稳定致密的电中性疏松纳滤(LNF)分离层.研究了膜的微结构特征... 详细信息

以聚偏氟乙烯(PVDF)/苯乙烯-马来酸酐(SMA)中空纤维超滤膜为基膜,在膜表面依次引入三乙二醇(TEG)、戊二醛(GA)、聚乙烯醇(PVA)3种亲水有机物,基于羟醛缩合反应在膜表面构建了稳定致密的电中性疏松纳滤(LNF)分离层.研究了膜的微结构特征和分离性能.结果表明,随着接枝反应的发生,膜亲水性逐渐提高,表面接近中性.带负电荷的日落黄(SY)和正电荷的结晶紫(CV)染料均可被完全去除,并保持较高的渗透通量[27.8 L/(m^(2)·h),28.9 L/(m^(2)·h)].此外,膜还表现出优异的化学稳定性和长期运行稳定性.本工作为制备具有高分离性能的电中性中空纤维纳滤膜提供了一种新的途径.

关键词：电中性化学交联中空纤维膜疏松纳滤染料脱除

同方期刊数据库

Acquired methemoglobinemia in a third trimester puerpera and her premature infant with sodium nitrite poisoning:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第22期12卷 5151-5158页

作者： Dong-Sheng Fei Yang Gao Xue-Jiao Bao Yu-Jia tang Yi-Lu Lin Jia-Xi Xu Jia-Ning Zhang Bo-Wen Liu kai kang Department of Critical Care Medicine The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Critical Care Medicine The Sixth Affiliated Hospital of Harbin Medical UniversityHarbin 150027Heilongjiang ProvinceChina

BACkGROUND The common cause of sodium nitrite poisoning has shifted from previous accidental intoxication by exposure or ingestion of contaminated water and food to recent alarming intentional intoxication as an employed method of suicide/*** subsequent formation of methemoglobin(Methb)restricts oxygen transport and utilization in the body,resulting in functional hypoxia at the tissue *** clinical practice,a mismatch of cyanotic appearance and oxygen partial pressure usually contributes to the identification of *** recognition of characteristic mismatch and accurate diagnosis of sodium nitrite poisoning are prerequisites for the implementation of standardized systemic *** SUMMARY A pregnant woman was admitted to the Department of Critical Care Medicine at the First Affiliated hospital of harbin Medical University due to consciousness disorders and drowsiness 2 h before ***,she developed vomiting and cyanotic *** woman underwent orotracheal intubation,invasive mechanical ventilation(IMV),and correction of internal environment disturbance in the *** premature infant was born with a higher-than-normal Methb level of 3.3%,and received detoxification with methylene blue and vitamin C,supplemental vitamin k1,an infusion of fresh frozen plasma,as well as respiratory support via orotracheal intubation and *** day 3 after admission,the puerpera regained consciousness,evacuated the IMV,and resumed enteral *** was then transferred to the maternity ward 24 h *** day 7 after admission,the woman recovered and was discharged without any *** Methb can cross through the placental *** of Methb both reflects severity of the sodium nitrite poisoning and serves as feedback on therapeutic effectiveness.

关键词： Sodium nitrite poisoning Methemoglobinemia Methemoglobin Third trimester puerpera Premature infant Placental barrier Methylene blue Case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

孕酮冰冻人血清国家标准品的研制

药物分析杂志 2024年第3期44卷 547-552页

作者：于婷唐利萍黄杰孙可其中国食品药品检定研究院北京100050 迈克生物股份有限公司参考系统中心成都611731

目的:研制孕酮冰冻人血清国家标准品,用于血清孕酮检测试剂盒的正确度评价及标准化研究。方法:分别收集来自正常人及孕妇的血清,且外观澄明、无明显溶血、黄疸和脂血,传染病四项检测均为阴性后,按比例分别添加凝血酶1 kU·L^(-1),无水... 详细信息

目的:研制孕酮冰冻人血清国家标准品,用于血清孕酮检测试剂盒的正确度评价及标准化研究。方法:分别收集来自正常人及孕妇的血清,且外观澄明、无明显溶血、黄疸和脂血,传染病四项检测均为阴性后,按比例分别添加凝血酶1 kU·L^(-1),无水氯化钙2.2196 g·L^(-1)和无水碳酸钠2.65 g·L^(-1),充分混匀后,离心(4000 r·min^(-1),4℃,25 min);再经2次多重过滤除菌后分装,制备成候选品Ⅰ和Ⅱ,-70℃条件下保存。分别采用单因素方差法和线性回归法评估候选品的均匀性和稳定性。联合5家实验室采用参考方法(同位素稀释液相色谱串联质谱法)定值,并计算不确定度。同时对候选品互通性进行评估。结果:经统计分析,候选品Ⅰ、Ⅱ的均匀性检验F值分别为0.5709和1.2009,均h;在(2~8)℃至少分别可稳定33 d和7 d;在-20℃至少可稳定33 d。候选品Ⅰ、Ⅱ反复冻融6次后稳定。候选品Ⅰ、Ⅱ定值结果为:Ⅰ:(4.44±0.24)ng·mL^(-1)(k=2);Ⅱ:(16.79±0.82)ng·mL^(-1)(k=2)。候选品Ⅰ、Ⅱ测定结果均在新鲜血清样本测定值所建立的拟合回归直线95%置信区间范围内。结论:孕酮候选品均匀性、稳定性、互通性良好,定值准确可靠,可作为国家标准品应用。该国家标准品的建立,对促进孕酮检测结果的一致化和标准化具有重要意义。

关键词：孕酮国家标准品准确度评价标准化互通性

在线全文

学校读者我要写书评

暂无评论

大规模集成光学微腔传感研究进展(特邀)

光子学报 2024年第5期53卷 23-38页

作者：孙博姝孙春雷唐仁杰王艺婷李兰西湖大学工学院杭州310030

近年来,集成光学微腔因其高灵敏度、高拓展性和高集成度在传感领域得到了广泛应用。利用低成本的互补金属氧化物半导体(CMOS)兼容的微纳加工工艺,集成光学微腔在实现大规模制备的小型化传感系统中具有显著潜力。然而,实现大规模传感阵... 详细信息

近年来,集成光学微腔因其高灵敏度、高拓展性和高集成度在传感领域得到了广泛应用。利用低成本的互补金属氧化物半导体(CMOS)兼容的微纳加工工艺,集成光学微腔在实现大规模制备的小型化传感系统中具有显著潜力。然而,实现大规模传感阵列系统仍然面临着诸多挑战,包括传感通量不足、全集成难度大、封装和测试成本高等。这些挑战主要是由传感器的系统架构复杂、光谱利用率低、加工工艺成本高等各种因素导致。本文旨在阐述常见阵列传感架构设计、集成光学谐振微腔传感器基本单元(主要包括微环、缺陷型光子晶体以及Fabry-Pérot型光子晶体谐振腔结构)及其传感阵列应用工作的研究进展。此外,还探讨了传感阵列系统的可拓展性和优化方案,并对其未来的发展方向进行了展望。

关键词：集成光学器件传感器光子晶体波导谐振腔光子晶体

hiFAST:An hIdata calibration and imaging pipeline for FAST

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 182-199页

作者： Yingjie Jing Jie Wang Chen Xu Ziming Liu Qingze Chen Tiantian Liang Jinlong Xu Yixian Cao Jing Wang huijie hu Chuan-Peng Zhang Qi Guo Liang Gao Mei Ai hengqian Gan Xuyang Gao Jinlin han Ligang hou Zhipeng hou Peng Jiang Xu kong Fujia Li Zerui Liu Li Shao hengxing Pan Jun Pan Lei Qian Jinghai Sun Ningyu tang Qingliang Yang Bo Zhang Zhiyu Zhang Ming Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 02206China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 55000China Max Planck Institute for Extraterrestrial Physics Garching 85748Germany kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Institute of Computational Cosmology Department of PhysicsUniversity of DurhamDurham DHI 3LEUK CAS key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Deep Space Exploration Laboratory/Department of Astronomy University of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Astrophysics Department of PhysicsUniversity of OxfordOxford OX/3RHUK College of Earth Sciences Guilin University of TechnologyGuilin 541004China Department of Physics Anhui Normal UniversityWuhu 241002China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 20023China

The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has the largest aperture and a 19-beam L-band receiver,making it powerful for investigating the neutral hydrogen atomic gas(hI)in the *** present hiFAST(https://***),a dedicated,modular,and self-contained calibration and imaging pipeline for processing the h?data of *** pipeline consists of frequency-dependent noise diode calibration,baseline fitting,standing wave removal using an FFT-based method,flux density calibration,stray radiation correction,and gridding to produce data *** modules can be combined as needed to process the data from most FAST observation modes:tracking,drift scanning,On-The-Fly mapping,and most of their *** hiFAST,the root-mean-square(RMS)noises of the calibrated spectra from all 19 beams were only slightly(~5%)higher than the theoretical *** results for the extended source M33 and the point sources are consistent with the results from *** moment maps(0,1 and 2)of M33 agree well with the results from the Arecibo Galaxy Environment Survey(AGES)with a fractional difference of less than 10%.For a common sample of 221 sources with signal-to-noise ratio S/N>10 from the Arecibo Legacy Fast ALFA(ALFALFA)survey,the mean value of fractional difference in the integrated flux density,Sint,between the two datasets is approximately 0.005%,with a dispersion of 15.4%.Further checks on the integrated flux density of 23 sources with seven observations indicate that the variance in the flux density of the source with luminous objects(Sint>2.5 Jy km s-1)is less than 5%.Our tests suggest that the FAST telescope,with the efficient,precise,and user-friendly pipeline hiFAST,will yield numerous significant scientific findings in the investigation of the h?in the universe.

关键词： fractional luminous correction