检索结果-南通市图书馆

Degradation of Rhodamine B by MnFe-LDH/PMS/o_(3) three-phase catalytic system: performance, mechanism and ecotoxicity studies

引用

Frontiers of environmental Science & engineering 2024年第1期18卷 111-127页

作者： Ying Han Ying Yang Weibao Liu Yilong Hou ce Wang Jiangwei Shang Xiuwen Cheng Key Laboratory of Pollutant Chemistry and environmental Treatment College of Chemistry and Environmental ScienceYili Normal UniversityYining 835000China Key Laboratory for environmental Pollution Prediction and Control of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

This study developed a novel MnFe-LDH/PMS/o3 three-phase catalytic system to degrade the organic dye RhB, which was used to address the drawbacks of persulfate oxidation and ozonation techniques. The structure, ionic and elemental composition, specific surface area, and magnetic properties of the LDHs were investigated using a variety of physicochemical characterization tools. The results showed that MnFe-LDH had a large specific surface area, a rich crystalline phase composition, and a functional group structure. The RhB degradation rate of MnFe-LDH/PMS/o3 was 0.34 min−1, which was much higher than that of other comparative systems. RhB could be completely degraded in 10 min after optimization and had a significant effect on ToC removal. The system was found to be effective over a wide pH range. Common anions were largely unaffected and humic acid acted as an inhibitor. At the same time, the system had generally effective degradation performance for different dyes. Combined with quenching experiments and ePR, it was found that So4•−, •oH, o_(2)•−, and 1o_(2) all participated in the reaction, and •oH contributed more. The degradation pathway of RhB was derived by LC-MS, and the T.e.S.T. evaluation found that the toxicity of the intermediate product was significantly reduced. Finally, the stability and availability of LDHs were verified using cycling experiments and metal ion leaching. This work provides a theoretical basis and data support for the synergistic catalysis of PMS/o3 and the deep treatment of dye wastewater.

关键词： Rhodamine B Layered double hydroxides Peroxymonosulfate ozonation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Heterostructured Pt-Ni_(3)Mo_(3)N formed via ammonia-containing polyoxometalates for highly efficient electrocatalytic hydrogen evolution in acid medium

引用

Journal of energy Chemistry 2024年第5期92卷 698-704页

作者： Bianqing Ren Xue Gong Jing Cao Dezheng Zhang Zizhun Wang Ping Song ce Han Weilin Xu State Key Laboratory of electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied Chemistry and engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Automobile Materials Moe School of Materials Science&EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012JilinChina

Constructing heterostructured nanohybrid is considered as a prominent route to fabricate alternative electrocatalysts to commercial Pt/C for hydrogen evolution reaction(HeR).In this work,(NH_(4))_(4)[NiH_(6)Mo_(6)o_(4)]·5H_(2)o polyoxometalates(NiMo_(6))are adopted as the cluster precursors for simple fabrication of heterostructured Pt-Ni_(3)Mo_(3)N nanohybrids supported by carbon black(Pt-Ni_(3)Mo_(3)N/C)without using additional N *** improved porosity and enhanced electronic interaction of Pt-Ni_(3)Mo_(3)N/C should be attributed to the integration of Pt with NiMo_(6),which favors the mass transport,promotes the formation of exposed catalytic sites,and benefits the regulation of intrinsic ***,the as-obtained Pt-Ni_(3)Mo_(3)N/C exhibits impressive and durable HeR performance as indicated by the low overpotential of 13.7 mV at the current density of 10 mA cm^(-2) and the stable overpotential during continuous working at 100 mA cm^(-2) for 100 *** work provides significant insights for the synthesis of new highly active heterostructured electrocatalysts for renewable energy devices.

关键词： Polyoxometalates Cluster precursors Heterostructured nanohybrids Hydrogen evolution reaction electrocatalysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of Perovskite Systems Based on AFeo_(3)(A=ce,La,Y)in Co_(2) Hydrogenation to Co

引用

Transactions of Tianjin University 2024年第4期30卷 337-358页

作者： Anna N.Matveyeva Shamil o.omarov Laboratory of Materials and Processes for Hydrogen energy Ioff e Institute194021 St.PetersburgRussia

Co_(2) is the most cost-eff ective and abundant carbon resource,while the reverse water-gas reaction(rWGS)is one of the most eff ective methods of Co_(2) *** work presents a comparative study of rWGS activity for perovskite systems based on AFeo_(3)(where A=ce,La,Y).These systems were synthesized by solution combustion synthesis(SCS)with diff erent ratios of fuel(glycine)and oxidizer(φ),diff erent amounts of NH 4 No_(3),and the addition of alumina or silica as *** techniques,including X-ray diff raction analysis,thermogravimetric analysis,Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy,energy-dispersive X-ray spectroscopy,N 2-physisorption,H_(2) temper-ature-programmed reduction,temperature-programmed desorption of H_(2) and Co_(2),Raman spectroscopy,and in situ FTIR,were used to relate the physicochemical properties with the catalytic performance of the obtained *** specifi c perovskite-containing system(either bulk or supported)has its own optimalφand NH_(4) No_(3) amount to achieve the highest yield and dispersion of the perovskite *** all synthesized systems,bulk SCS-derived La-Fe-o systems showed the highest resistance to reducing environments and the easiest hydrogen desorption,outperforming La-Fe-o produced by solgel combustion(SGC).Co_(2) conversion into Co at 600°C for bulk ferrite systems,depending on the A-cation type and preparation method,follows the order La(SGC)cee diff erences in properties between La-Fe-o obtained by the SCS and SGC methods can be attributed to diff erent ratios of oxygen and lanthanum vacancy contributions,hydroxyl coverage,morphology,and free iron oxide *** situ FTIR data revealed that Co_(2) hydrogenation occurs through formates generated under reaction conditions on the bulk system based on La-Fe-o,obtained by the SCS method.γ-Al_(2)o_(3) improves the dispersion of ceFeo_(3) and LaFeo_(3) phases,the specifi c surface area,and the quant

关键词： Perovskites LaFeo_(3) ceFeo_(3) YFeo_(3) Solution combustion synthesis Co_(2) hydrogenation Reverse water–gas reaction(rWGS)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

内蒙古东珺银铅锌矿床成矿时代与地质背景:来自富碱花岗斑岩地球化学、锆石U-Pb及闪锌矿Rb-Sr年代学的制约

引用

大地构造与成矿学 2024年第5期48卷 1040-1059页

作者：宋天骄王策梁细荣梁新权中国科学院广州地球化学研究所同位素地球化学国家重点实验室广东广州510640 中国科学院深地科学卓越创新中心广东广州510640 中国科学院大学北京100049 中山大学海洋科学学院广东珠海519082

东珺银铅锌矿床位于大兴安岭中北部内蒙古额尔古纳市,是近几年发现的大型银铅锌多金属矿床。该矿床的成矿时代、成矿岩石以及构造背景一直不明确,本文对矿区内的出露的安山岩和隐伏的花岗斑岩开展了LA-ICPMS锆石U-Pb定年及岩石地球化学... 详细信息

东珺银铅锌矿床位于大兴安岭中北部内蒙古额尔古纳市,是近几年发现的大型银铅锌多金属矿床。该矿床的成矿时代、成矿岩石以及构造背景一直不明确,本文对矿区内的出露的安山岩和隐伏的花岗斑岩开展了LA-ICPMS锆石U-Pb定年及岩石地球化学研究,并对银铅锌矿体中闪锌矿进行了Rb-Sr同位素定年。结果显示,安山岩喷出年龄为170.2±1.0 Ma、花岗斑岩结晶年龄为145.0±1.2 Ma以及矿体的成矿年龄为141.1±3.4 Ma。成矿年龄稍晚于花岗斑岩成岩年龄,表明成矿作用与晚侏罗世-早白垩世的岩浆活动具有密切的成因联系。花岗斑岩具有高硅(Sio_(2)=71.79%~72.88%)和富碱(Na_(2)o+K_(2)o=6.47%~8.23%)的特征,属于高钾钙碱性-钾玄岩系列。岩石的稀土元素总量较高(∑Ree=195×10^(-6)~217×10^(-6)),具明显的eu负异常(δeu=0.28~0.33),微量元素富集大离子亲石元素Rb、Th、U、K,明显亏损高场强元素Nb、Ta、Ti和过渡元素Sr、Ba,且具有高的10^(4)×Ga/Al(2.68~2.84)值,其全岩(^(87)Sr/^(86)Sr)i和ε_(Nd)(t)分别为0.704423~0.704768和+0.01~+1.94,锆石的ε_(Hf)(t)为+1.37~+8.29,表明该岩体具有A型花岗岩特征,其岩浆源区可能由地幔熔体和新生地壳熔体混合形成。结合区域地质和前人研究成果,认为东珺矿区花岗斑岩及相关的矿化作用形成于后碰撞伸展的构造环境,与晚侏罗世-早白垩世鄂霍茨克洋闭合后碰撞密切相关。

关键词：东珺银铅锌矿床锆石年代学闪锌矿Rb-Sr 地球化学蒙古-鄂霍茨克洋

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

KRT6A介导Wnt/β-catenin信号通路调节上皮-间质转化促进非小细胞肺癌A549细胞抗辐射

引用

中国医科大学学报 2024年第7期53卷 628-634页

作者：尹策刘畅冯革中国医科大学附属盛京医院肿瘤中心沈阳110004 中国医科大学附属第一医院放疗科沈阳110001

目的探讨KRT6A对非小细胞肺癌A549细胞抗辐射的促进作用,并阐明其作用机制。方法诱导并建立抗辐射A549(A549-RR)细胞,通过CCK-8法、平板克隆形成实验和流式细胞术验证细胞构建成功。Western blotting检测A549和A549-RR细胞中KRT6A表... 详细信息

目的探讨KRT6A对非小细胞肺癌A549细胞抗辐射的促进作用,并阐明其作用机制。方法诱导并建立抗辐射A549(A549-RR)细胞,通过CCK-8法、平板克隆形成实验和流式细胞术验证细胞构建成功。Western blotting检测A549和A549-RR细胞中KRT6A表达情况。将A549-RR细胞分为敲减对照组(sh-NC组)和敲减KRT6A组(sh-KRT6A组),Western blotting检测KRT6A、上皮-间质转化(eMT)相关蛋白(e-cadherin、N-cadherin、Vimentin、Snail和Slug)以及β-catenin的表达;采用CCK-8法、平板克隆形成实验和流式细胞术检测细胞增殖及凋亡情况。将A549-RR细胞分为sh-NC组、sh-KRT6A组、敲减KRT6A和过表达对照(shKRT6A+ov-NC组)以及敲减KRT6A和过表达β-catenin (sh-KRT6A+ov-β-catenin组),Western blotting检测β-catenin以及eMT相关蛋白e-cadherin、N-cadherin、Vimentin、Snail和Slug的表达;采用CCK-8法、平板克隆形成实验和流式细胞术检测细胞增殖及凋亡情况。结果成功建立了A549-RR细胞,A549-RR细胞中KRT6A表达上调。敲减KRT6A降低A549-RR细胞增殖活性和克隆形成能力,增加细胞凋亡率,上调e-cadherin蛋白表达并下调N-cadherin、Vimentin、Snail、Slug和β-catenin蛋白表达;过表达β-catenin可逆转此作用。结论 KRT6A在A549-RR细胞中表达上调,敲减KRT6A可降低A549-RR细胞的抗辐射能力,其机制可能与激活Wnt/β-catenin信号通路诱导的eMT有关。

关键词：非小细胞肺癌角蛋白6A 放疗上皮-间质转化 Wnt/β-catenin信号通路

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于多源信息的商品详情页推荐方法

引用

长江信息通信 2024年第5期37卷 139-141页

作者：郑策天翼电子商务有限公司上海分公司上海200085

现有的商品详情页内的商品推荐,通常会基于主商品的品牌、店铺、类目等信息推荐相似商品,同质化较为严重,且存在新商品冷启动困难。基于此,文章提出一种基于多源信息的商品详情页推荐方法,能够基于主商品的意图进行适度泛化,引入评论信... 详细信息

现有的商品详情页内的商品推荐,通常会基于主商品的品牌、店铺、类目等信息推荐相似商品,同质化较为严重,且存在新商品冷启动困难。基于此,文章提出一种基于多源信息的商品详情页推荐方法,能够基于主商品的意图进行适度泛化,引入评论信息,强化与延伸用户的即时兴趣,不仅能缓解浏览过程中的疲劳度,还能缓解新商品冷启动困难的问题。通过对比实验,实验结果表明,所提方法的mAP值较高,NDCG有较明显提升,在推荐排序方面的性能较好,具有较好的推荐效果。

关键词：个性化推荐电商平台推荐方法多源信息

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

心肌细胞铁死亡的机制及中药的保护作用

引用

中国实验方剂学杂志 2024年第4期30卷 260-270页

作者：李浩然曹策李磊刘建勋广东药科大学中医药研究院广州511436 中国中医科学院西苑医院中药药理北京市重点实验室国家中医心血管疾病临床医学研究中心北京100091

铁死亡是一种新型的细胞程序性死亡方式,典型特征为铁超载和脂质过氧化。心血管疾病是多种因素所导致的心脏发生的缺血性或出血性疾病,主要包括心肌梗死、心力衰竭等。铁死亡参与心肌细胞的损伤过程,并在多种心血管疾病的病程中起着推... 详细信息

铁死亡是一种新型的细胞程序性死亡方式,典型特征为铁超载和脂质过氧化。心血管疾病是多种因素所导致的心脏发生的缺血性或出血性疾病,主要包括心肌梗死、心力衰竭等。铁死亡参与心肌细胞的损伤过程,并在多种心血管疾病的病程中起着推动作用;其主要作用机制包括铁稳态的破坏、活性氧的产生、抗氧化体系的紊乱,线粒体膜损伤、内质网应激及抑癌基因p53、核因子e2相关因子2(Nrf2)途径等。心肌损伤是众多心病患者的死亡原因之一而中药单体或是复方都在治疗铁死亡导致的心肌细胞损伤中表现出了良好的效果,包括黄芩苷通过胞内磷脂酰肌醇3-激酶/蛋白激酶B/内皮型一氧化氮合酶(PI3K/Akt/eNoS)通路保护心肌缺血再灌注(I/R)大鼠的心脏微血管内皮细胞、龙牙楤木皂苷通过核受体亚家族3C组成员1/p53/溶质载体家族7成员11(NR3C1/p53/SLC7A11)通路抑制心肌细胞铁死亡、心阳片通过调节磷酸化混合谱系酶3/c-Jun氨基末端激酶/p53(MLK3/JNK/p53)信号通路改善氧化应激等。探索铁死亡的机制和挖掘相关中药在心肌细胞损伤后发挥的保护作用具有重要意义。该文对铁死亡的机制及其与心肌细胞的关系、通过铁死亡通路治疗心血管疾病的中药单体和复方进行了综述;重点介绍了中药治疗的通路和发挥的效果,以期为中药对心血管疾病的治疗提供参。

关键词：铁死亡心肌细胞心肌损伤心血管疾病(CVD) 中药

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Integration of Circular economy and Impact Assessment: A Bibliometric Analysis

引用

Journal of environmental Science and engineering(A) 2024年第4期13卷 136-150页

作者： Marina Morhy Pereira Marcelo Montaño São Carlos School of engineering University of São PauloSão Carlos-SP 13563-120Brazil

In spite of the proximity between“ce(Circular economy)”and“sustainability”,it is relevant to consider that a circular strategy is not inherently sustainable or free from significant environmental and social ***,assessing the impacts of ce initiatives and the promotion of circularity in development projects submitted to IA(Impact Assessment)processes are crucial,though the relationship between both fields has not been yet systematically ***,the present paper is focused on the identification of the links between IA and ce,based on the application of bibliometric techniques and Content *** outcomes revealed three thematic clusters in which significant overlaps were found:the 1st revealed LCA(Life Cycle Assessments)as the most used IA technique to assess the impacts of ce strategies,the 2nd encompasses climate change and environmental issues,and the 3rd cluster revealed that the integration of sustainability is the most frequent objective linking IA and ce,though characterized by different *** findings allow concluding that IA fosters the transition to ce by assessing the impacts of circular initiatives and ce strategies can improve IA practice by making it more effective.

关键词： IA ce sustainability bibliometric analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

observation of spectral lines in the exceptional GRB 221009A

引用

Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 187-206页

作者： Yan-Qiu Zhang Shao-Lin Xiong Ji-Rong Mao Shuang-Nan Zhang Wang-Chen Xue Chao Zheng Jia-Cong Liu Zhen Zhang Xi-Lu Wang Ming-Yu Ge Shu-Xu Yi Li-Ming Song Zheng-Hua An ce Cai Xin-Qiao Li Wen-Xi Peng Wen-Jun Tan Chen-Wei Wang Xiang-Yang Wen Yue Wang Shuo Xiao Fan Zhang Peng Zhang Shi-Jie Zheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Yunnan observatories Chinese Academy of SciencesKunming 650011China center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100012China Key Laboratory for the Structure and evolution of celestial objects Chinese Academy of SciencesKunming 650216China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang 550001China College of electronic and Information engineering Tongji UniversityShanghai 201804China

As the brightest gamma-ray burst ever observed,GRB 221009A provided a precious opportunity to explore spectral line *** this article,we performed a comprehensive spectroscopy analysis of GRB 221009A jointly with GeCAM-C and Fermi/GBM data to search for emission and absorption *** the first time we investigated the line feature throughout this GRB including the most bright part where many instruments suffered problems,and identified prominent emission lines in multiple time *** central energy of the Gaussian emission line evolves from about 37 to 6 MeV,with a nearly constant ratio(about 10%)between the line width and central ***,we find that both the central energy and the energy flux of the emission line evolve with time as a power law decay with power law index of–1 and–2,*** suggest that the observed emission lines most likely origin from the blue-shifted electron positron pair annihilation 511 ke V *** find that a standard high latitude emission scenario cannot fully interpret the observation,thus we propose that the emission line comes from some dense clumps with electron positron pairs traveling together with the *** this scenario,we can use the emission line to directly,for the first time,measure the bulk Lorentz factor of the jet(Γ)and reveal its time evolution(i.e.,Γ~t^(-1))during the prompt ***,we find that the flux of the annihilation line in the co-moving frame keeps *** discoveries of the spectral line features shed new and important lights on the physics of GRB and relativistic jet.

关键词： GRB GRB 221009A emission line

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

乌尔根地区早侏罗世埃达克质花岗斑岩年代学和地球化学特征:对蒙古–鄂霍茨克洋南向俯冲闭合时间的制约

引用

地球化学 2024年第4期53卷 545-563页

蒙古–鄂霍茨克缝合带在东亚大陆形成演化历史上占有极为重要的位置,但对其南向俯冲的演化历史还存在较多争议。本文对蒙古–鄂霍茨克缝合带南缘的额尔古纳地块乌尔根地区花岗斑岩进行了锆石U-Pb年代学、Lu-Hf同位素和全岩主量、微量元... 详细信息

蒙古–鄂霍茨克缝合带在东亚大陆形成演化历史上占有极为重要的位置,但对其南向俯冲的演化历史还存在较多争议。本文对蒙古–鄂霍茨克缝合带南缘的额尔古纳地块乌尔根地区花岗斑岩进行了锆石U-Pb年代学、Lu-Hf同位素和全岩主量、微量元素以及Sr-Nd同位素的分析研究,在此基础上限定了蒙古–鄂霍茨克洋在额尔古纳地块的闭合时间。锆石U-Pb定年结果显示,花岗斑岩侵位年龄为174.9±1.1 Ma,是早侏罗世晚期岩浆事件的产物。花岗斑岩属于过铝质高钾钙碱性岩石,其Sio_(2)、Al_(2)o_(3)和Sr含量高,而Y和Yb含量较低,类似于典型埃达克岩的地球化学特征。该岩石富集轻稀土和大离子亲石元素,强烈亏损重稀土和高场强元素,且无明显eu负异常。岩石具有相对亏损的Sr-Nd同位素组成,其(^(87)Sr/^(86)Sr)i=0.706665~0.707989,ε_(Nd)(t)=1.22~4.18。锆石ε_(Hf)(t)=5.3~12.0,二阶段模式年龄(t_(DM2))为451~879 Ma。这些特征揭示乌尔根地区花岗斑岩岩浆是由年轻的加厚下地壳部分熔融形成,而非俯冲板片熔融。结合前人研究成果以及区域地质演化规律,认为乌尔根地区花岗斑岩形成于蒙古–鄂霍茨克洋闭合后的碰撞向造山期后发展的转折时期。

关键词：乌尔根埃达克岩锆石U-Pb年代学地球化学蒙古–鄂霍茨克洋

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：