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Enhancing catalytic H2 generation by surface electronic tuning of systematically controlled Pt-Pb nanocrystals

nano Research 2019年第9期12卷 2335-2340页

作者： Bin E Bolong Huang nan zhang Qi Shao Yujing Li Xiaoqing Huang College of Chemistry Chemical engineering and Materials ScienceSoochow UniversitySuzhou 215123China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina College of Materials Beijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering China University of PetroleumBeijing 102249China

Although many previous studies have show n that the shape-c ontrol of nano crystal(NCs)is an efficient strategy to improve the catalytic performance,these syntheses were conducted under very different conditions,which are not suitable for the shape-dependent properties studies as well as catalysis ***,we demonstrate an effective method for the selective synthesis of well-defined PtPb NCs in a highly con trollable *** disti net PtPb NCs,n amely PtPb pea nut nano crystals,PtPb hexag onal nan opiates,PtPb octahedra nano crystals(ONCs)and PtPb nan oparticles have been selectively prepared in the prese nee of differe nt phe *** ifica ntly,we found that the created PtPb NCs/C shows the shape-dependent activity with the optimized PtPb ONCs/C being the most active for the ethanol reforming to H2,22.4 times higher than the commercial Pt/*** high performance of PtPb ONCs/C has been also successfully expanded into other polyhydric alcohols reformings.X-ray photoelectron spectroscopy(XPS)reveals that the high Pt(O)/Pt(ll)ratio in PtPb NCs/C enhances the alcohols *** density functional theory(DFT)studies show the PtPb ONCs possess the highest surface averaged electronic occu patio n for unit Pt-atom,matchi ng well with XPS *** PtPb ONCs/C also displays excelle nt durability with limited activity decay and negligible structure/composition changes after ten *** work demonstrates an important advance in the high-level control of metallic nanostructures to tune the catalytic activities.

关键词： surface electronic structure shape control PtPb nanocrystal hydrogen generation alcohol reforming

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丁二烯装置循环气压缩机出口消音器及管道振动原因分析及改造

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乙烯工业 2024年第1期36卷 21-23+65页

作者：张小伟冯敏盛楠巨涛蒋峰中国石油天然气股份有限公司独山子石化分公司

针对某化工企业螺杆压缩机出口消音器及管道振动问题，对原排气管道进行了气流脉动和管道振动分析，结合现场管道振动实测数据，找到管道振动的主要原因并提出相应的改造措施。通过将消音器更换为三腔室阻抗复合式消音器，改变排气管道... 详细信息

针对某化工企业螺杆压缩机出口消音器及管道振动问题，对原排气管道进行了气流脉动和管道振动分析，结合现场管道振动实测数据，找到管道振动的主要原因并提出相应的改造措施。通过将消音器更换为三腔室阻抗复合式消音器，改变排气管道，增加支撑结构，加固热电偶支管等措施。改造后排气管道内各点的压力不均匀度均在API 619的允许范围内，脉动平均降幅72%;高阶固有频率避开压缩机激发频率的±10%,排气管道系统整体的一阶固有频率由4.572 Hz升至8.862 Hz,改造后的消音器振动值最大为32 mm/s,较改造前降低了64%;出口管道的振动值最大为10 mm/s,较改造前降低了87.5%,证明了改造措施的有效性。

关键词：螺杆压缩机消音器管道振动解决措施

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Seismic Imaging of the Sedimentary System of the Upper Cretaceous Nenjiang Formation in the Northern Songliao Basin

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Journal of Earth Science 2019年第4期30卷 788-798页

作者： Wuling Mo Chaodong Wu nan Su Shun zhang Mingzhen Wang School of Earth and Space Sciences Peking UniversityBeijing 100871China PetroChina Exploration and Development Research Institute Langfang 257000China Exploration and Development Research Institute of Daqing Oilfield Co. Ltd. Daqing 163712China

This paper studied seismic imaging of the sedimentary system of the Nenjiang Formation in the Northern Songliao Basin based on seismic sedimentology. An accurate and detailed depiction and explanation is provided for underground geological bodies within a relative geological period using the stratal slice technology,based on three-order sequence correlations of well logging and seismic data for the purpose of obtaining high-resolution pictures of the sedimentary system. Research results have revealed that the sedimentary system of the Upper Cretaceous Nenjiang Formation in the Northern Songliao Basin includes meandering streams,anastomosing streams,lake deltas,and sediment gravity flow channels. Based on seismic imaging analysis,the genesis and seismic geomorphology of the sedimentary system of the Nenjiang Formation are explored in order to understand the spatial distribution of typical sedimentary bodies and the evolution of streams in the Nenjiang Formation. According to the research results,the sedimentation of the Nenjiang Formation was subject to the delta system in the east and northeast of the formation. The provenance in the northeastern part played a dominant role during the deposition of the Nenjiang Formation for some time;after the earlier maximum flooding in the second and third members of the Nenjiang Formation,the northeastern system began to decline and was gradually replaced by the eastern system. Stratal slices have revealed that a well-developed gravity flow channel system was developed in the first member of the Nenjiang Formation,and massive slip blocks occurred in the second and third members of the formation. The research results indicated that the large gravity flow channel system in the first member of the Nenjiang Formation was formed by streams that emptied directly into the lake;and the slip blocks in the second and third members were the results of gravity sliding of sediments along steep slopes at the delta front.

关键词： seismic sedimentology stratal slice sedimentary system Nenjiang Formation Songliao Basin

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基于Wnt/β-连环蛋白通路探究金天格对肿瘤坏死因子-α诱导的小鼠MC3T3E1细胞生物学功能的影响实验研究

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陕西医学杂志 2024年第6期53卷 744-747,753页

作者：张婷刘丹贠丹丹耿男西安医学院第一附属医院风湿免疫科陕西西安710077 西安市风湿免疫病防治重点实验室陕西西安710021

目的:探讨金天格通过调节Wnt/β-连环蛋白(Wnt/β-catenin)通路对肿瘤坏死因子-α(TNF-α)诱导的小鼠成骨细胞(MC3T3E1)细胞生物学功能的影响。方法:体外培养MC3T3E1细胞,分为对照组、TNF-α组(50 ng/ml TNF-α)、L-金天格组(50 ng/ml T... 详细信息

目的:探讨金天格通过调节Wnt/β-连环蛋白(Wnt/β-catenin)通路对肿瘤坏死因子-α(TNF-α)诱导的小鼠成骨细胞(MC3T3E1)细胞生物学功能的影响。方法:体外培养MC3T3E1细胞,分为对照组、TNF-α组(50 ng/ml TNF-α)、L-金天格组(50 ng/ml TNF-α+10^(-6) g/L金天格)、M-金天格组(50 ng/ml TNF-α+10-5 g/L金天格)、H-金天格组(50 ng/ml TNF-α+10^(-4) g/L金天格)、Dickkopf-1(DKK-1)组(50 ng/ml TNF-α+10 ng/ml Wnt/β-catenin通路抑制剂DKK-1)、H-金天格+LiCl组(50 ng/ml TNF-α+10^(-4) g/L金天格+20μmol/L Wnt/β-catenin通路激活剂LiCl)。用CCK-8试剂盒对细胞活性进行检测,用流式细胞仪对细胞凋亡情况进行检测,用酶联免疫吸附试验对细胞白细胞介素-1β(IL-1β)和IL-6水平进行检测,用Western blot对细胞凋亡相关蛋白及Wnt/β-catenin信号通路蛋白表达情况进行检测。结果:与对照组比较,TNF-α组细胞活性、B淋巴细胞瘤-2(Bcl-2)、细胞程序性死亡配体-1(PD-L1)蛋白表达降低,细胞凋亡率、IL-1β、IL-6水平以及B细胞淋巴瘤(Bax)、β-catenin、转录因子7样2(TCF7L2)、细胞周期蛋白D1(Cyclin D1)蛋白表达升高(均P<0.05)。与TNF-α组比较,L-金天格组、M-金天格组、H-金天格组、DKK-1组细胞活性及Bcl-2、PD-L1蛋白表达升高,细胞凋亡率、IL-1β、IL-6水平以及Bax、β-catenin、TCF7L2、Cyclin D1蛋白表达降低(均P<0.05)。与H-金天格组比较,H-金天格+LiCl组细胞活性及Bcl-2、PD-L1蛋白表达降低,细胞凋亡率、IL-1β、IL-6水平以及Bax、β-catenin、TCF7L2、Cyclin D1蛋白表达升高(均P<0.05)。结论:金天格可能通过抑制Wnt/β-catenin通路减轻TNF-α诱导的MC3T3E1细胞损伤。

关键词：金天格肿瘤坏死因子-α MC3T3E1细胞 Wnt/β-catenin通路细胞增殖细胞凋亡小鼠

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A Mobile Localization Strategy for Wireless Sensor Network in NLOS Conditions

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China Communications 2016年第10期13卷 69-78页

作者： Long Cheng Yan Wang Xingming Sun nan Hu Jian zhang School of Information Science and Engineering Northeastern University Department of Computer and Communication Engineering Northeastern University School of Computer and Software Nanjing University of Information Science and Technology

The problem of mobile localization for wireless sensor network has attracted considerable attention in recent years. The localization accuracy will drastically grade in non-line of sight(NLOS) conditions. In this paper, we propose a mobile localization strategy based on Kalman filter. The key technologies for the proposed method are the NLOS identification and mitigation. The proposed method does not need the prior knowledge of the NLOS error and it is independent of the physical measurement ways. Simulation results show that the proposed method owns the higher localization accuracy when compared with other methods.

关键词： wireless sensor network localization non-line of sight identification mitigation

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Polymorphism and Flexibility of DNA in Alcohols

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Chinese Physics Letters 2020年第8期37卷 194-199页

作者： nan zhang Ming-Ru Li Hui-Ting Xu and Feng-Shou zhang The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China China Beijing Radiation Center Beijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Molecular dynamics simulations are performed to investigate the polymorphism and flexibility of DNA in water,ethylene glycol(EG)and ethanol(EA)*** in EG resembles the structure of DNA in water exhibiting *** contrast,the DNA is an A-DNA state in the *** demonstrate that one important cause of these A$\leftrightarrow$B state changes is the competition between hydration and direct cation coupling to the phosphate groups on DNA *** DNA structural polymorphism,it is caused by competition between hydration and cation coupling to the base pairs on *** flexible DNA in water and EA,DNA is immobilized around the canonical structure in EG solution,eliminating the potential biological effects of less common non-canonical DNA sub-states.

关键词： canonical hydration backbone

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IgA肾病气阴两虚证诊断量表的研制

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吉林中医药 2024年第6期44卷 677-681页

作者：何鸣宇金迪张守琳南赫长春中医药大学长春130117 长春中医药大学第一附属医院长春130021

目的研制IgA肾病气阴两虚证诊断量表,为临床诊断提供思路与方法。方法通过文献检索、专家小组讨论、术语规范化、德尔菲专家问卷调查等方式,筛选量表核心条目,并通过层次分析法赋予权重,最终进行专家共识论证,确定诊断量表的分级划分... 详细信息

目的研制IgA肾病气阴两虚证诊断量表,为临床诊断提供思路与方法。方法通过文献检索、专家小组讨论、术语规范化、德尔菲专家问卷调查等方式,筛选量表核心条目,并通过层次分析法赋予权重,最终进行专家共识论证,确定诊断量表的分级划分界限、诊断方式及呈现形式等。结果确定IgA肾病气阴两虚证诊断量表12个核心条目及具体权重划分界限,临床症状(总权重0.68)>舌象(总权重0.23)>脉象(总权重0.09),以主次症结合的形式呈现。结论 IgA肾病气阴两虚证诊断量表符合临床实际,可为各级中医师临床诊断提供依据,可为相关临床试验及其他量表研制提供参考。

关键词： IgA肾病气阴两虚证诊断量表

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不同电荷对替米考星脂质体靶向金黄色葡萄球菌的影响

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黑龙江畜牧兽医 2024年第16期 97-103,119页

作者：邱咏康杜娟张越洋王千郦姚倩李楠鑫李昊欢张伟四川农业大学动物医学院成都611130

为了探究不同电荷对替米考星脂质体(TMS-Lip)靶向金黄色葡萄球菌的影响,试验制备带有不同电荷的TMS-Lip并对其进行表征,测定带有不同电荷TMS-Lip的抑菌圈直径、最小抑菌浓度,制备TMS-Lip卡波姆934凝胶,研究其对小鼠伤口感染模型的治疗... 详细信息

为了探究不同电荷对替米考星脂质体(TMS-Lip)靶向金黄色葡萄球菌的影响,试验制备带有不同电荷的TMS-Lip并对其进行表征,测定带有不同电荷TMS-Lip的抑菌圈直径、最小抑菌浓度,制备TMS-Lip卡波姆934凝胶,研究其对小鼠伤口感染模型的治疗效果。结果表明:研究制得具有不同电荷的三组(A、B、C组)TMS-Lip,三组TMS-Lip的Zeta电位分别为(-8.39±0.22)mV、(-20.30±0.67)mV、(-32.40±0.46)mV。随着Zeta电位的下降,脂质体的粒径从146.6 nm降低至91.1 nm,且在体外抗菌活性试验中的抑菌能力有所降低;但在体内动物试验中,随着Zeta电位的下降,A、B、C组小鼠的伤口愈合率先升高后降低,以带有适中负电荷的B组对小鼠伤口感染模型的治疗效果最佳。说明不同电荷对脂质体靶向金黄色葡萄球菌的影响存在体内外差异,在实际应用时,对脂质体Zeta电位的调整应多方位考虑与验证。

关键词：表面电荷 Zeta电位脂质体替米考星金黄色葡萄球菌

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改良铆钉缝合法在后腹腔镜下肾部分切除术中的应用

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河南医学研究 2024年第2期33卷 236-240页

作者：高世玉张楠刘磊陈涛河南中医药大学第五临床医学院/郑州人民医院泌尿外科河南郑州450003

目的探讨改良铆钉缝合法在后腹腔镜下肾部分切除术中的临床效果。方法选取2019年3月至2022年3月因肾细胞癌于郑州人民医院泌尿外科接受后腹腔镜下肾部分切除术的患者,共81例,回顾其临床资料,根据缝合方法分为研究组(改良铆钉缝合,41例)... 详细信息

目的探讨改良铆钉缝合法在后腹腔镜下肾部分切除术中的临床效果。方法选取2019年3月至2022年3月因肾细胞癌于郑州人民医院泌尿外科接受后腹腔镜下肾部分切除术的患者,共81例,回顾其临床资料,根据缝合方法分为研究组(改良铆钉缝合,41例)和对照组(倒刺线连续缝合,40例),总结临床资料,比较两组患者的热缺血时间、术中出血量、术后引流量、术后尿漏发生率、术后肾周血肿发生率、术前术后血红蛋白下降情况。结果研究组热缺血时间短于对照组,术中出血量、术后引流量、术后尿漏及肾周血肿发生率均低于对照组(P<0.05)。术后研究组血红蛋白水平高于对照组,差异有统计学意义(P<0.05)。对照组中出现1例术后尿瘘和2例术后肾周血肿,经过治疗后好转,研究组未出现并发症。结论改良铆钉缝合法在后腹腔镜下肾部分切除术中效果确切,可缩短肾脏热缺血时间,减少术中出血量及术后并发症,值得在临床推广。

关键词：改良铆钉缝合腹腔镜肾部分切除术

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Quantitation of camellianin A in HepG2 cells using a high performance liquid chromatography-electrospray ionization tandem mass spectrometric method

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Chinese Journal of Natural Medicines 2017年第3期15卷 234-240页

作者： CHEN qian-qian XI Hai-Ling WANG Cai-Yun XU Feng-Guo zhang Wei State Key Laboratory of Quality Research in Chinese Medicine Macao University of Science and Technology School of Public Health Baotou Medical College Key Laboratory of Drug Quality Control and Pharmacovigilance(Ministry of Education) China Pharmaceutical University

The present study was designed to develop a sensitive and selective high performance liquid chromatography-tandem mass spectrometric method for the determination of Camellianin A in HepG2 *** extraction of Camellianin A was achieved using 15% trichloroacetic acid and then separated on a C_(18) column interfaced with a triple quadrupole tandem mass spectrometer in multiple reaction monitoring *** mobile phase was consisted of methanol-water(0.1% formic acid)(55:45,V/V).The total run time was 5.0 *** method was linear in the concentration range of 0.25-250.0 ng·mL^(-1).The lower limit of quantification was 0.25 ng·mL^(-1).The intra-and inter-day relative standard deviations of entire concentration range were less than 9.3%.The proposed HPLC-MS/MS method was successfully applied to detect the intracellular concentration of Camellianin A in HepG2 cells.

关键词： Camellianin A HepG2 cells HPLC-MS/MS

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