检索结果-南通市图书馆

Ultrasonic Plasma Engineering Toward Facile Synthesis of Single-Atom M-n4/n-Doped Carbon(M=Fe,Co) as Superior Oxygen Electrocatalyst in Rechargeable Zinc-Air Batteries

引用

nano-Micro Letters 2021年第4期13卷 76-95页

作者： Kai Chen Seonghee Kim Minyeong je Heechae Choi Zhicong Shi nikola Vladimir Kwang Ho Kim Oi Lun Li Department of Materials Science and Engineering Pusan National University30 Jangjeon‑dongGeumjeong‑guBusan 609‑735Republic of Korea Theoretical Materials and Chemistry Group Institute of Inorganic ChemistryUniversity of CologneGreinstr.650939 CologneGermany School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006People’s Republic of China Faculty of Mechanical Engineering and naval Architecture University of ZagrebIvana Lucica 510002 ZagrebCroatia Global Frontier R&D Center for Hybrid Interface Materials 30 Jangjeon‑dongGeumjeong‑guBusan 46241Republic of Korea

As bifunctional oxygen evolution/reduction electrocatalysts,transition-metal-based single-atom-doped nitrogen-carbon(nC)matrices are promising successors of the corresponding noblemetal-based catalysts,offering the advantages of ultrahigh atom utilization effciency and surface active ***,the fabrication of such matrices(e.g.,well-dispersed single-atom-doped M-n4/nCs)often requires numerous steps and tedious ***,ultrasonic plasma engineering allows direct carbonization in a precursor solution containing metal phthalocyanine and *** combining with the dispersion effect of ultrasonic waves,we successfully fabricated uniform single-atom M-n4(M=Fe,Co)carbon catalysts with a production rate as high as 10 mg *** Co-n4/nC presented a bifunctional potential drop ofΔE=0.79 V,outperforming the benchmark Pt/C-Ru/C catalyst(ΔE=0.88 V)at the same catalyst *** calculations revealed that Co-n4 was the major active site with superior O2 adsorption-desorption *** a practical Zn-air battery test,the air electrode coated with Co-n4/nC exhibited a specific capacity(762.8 mAh g(-1))and power density(101.62 mW cm^(-2)),exceeding those of Pt/C-Ru/C(700.8 mAh g^(-1) and 89.16 mW cm^(-2),respectively)at the same catalyst ***,for Co-n4/nC,the potential difference increased from 1.16 to 1.47 V after 100 charge-discharge *** proposed innovative and scalable strategy was concluded to be well suited for the fabrication of single-atom-doped carbons as promising bifunctional oxygen evolution/reduction electrocatalysts for metal-air batteries.

关键词： Single-atom-doped M-n4/nC catalyst Plasma engineering ORR/OER bifunctional activity DFT calculation Rechargeable Zn-air battery

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

Effects of honing treatment on AIP-Tin and TiAln coated end-mill for high speed machining

引用

Transactions of nonferrous Metals Society of China 2011年第A1期21卷 83-87页

作者： Jae-Young HEO Sung-Hak CHO Tae-Jin je Kwang-Ho KIM Hyung-Woo LEE Myung-Chang KAnG national Core Research Center for Hybrid Materials Solution Pusan National University nano Machining Laboratory Korea Institute of Machinery and Material (KIMM) 171 Jang-dong Yuseong-Gu Daejeon 305-343 Korea

The objective of this work is to compare the tool performance of Tin and TiAln coated carbides end-mills deposited by an arc ion plating (AIP) method, using honing treatment to polish the cutting edge surface sleekly. The curve of surface roughness versus honing time showed a rapid improvement initially and thereafter became steady, manifesting a saturation effect. The optimal honing time related to surface roughness was determined to be approximately 20 s. As the surface roughness increased, the critical loads reduced. At an average surface roughness (Ra) of 0.028 μm, the highest critical loads of Tin and TiAln coating layers were 98 and 114 n, respectively. Tool performances of uncoated and coated tools were conducted under high speed machining (HSM) of AISI D2 cold-worked die steel (62 HRC). Consequently, the TiAln coated end-mill using honing treatment showed excellent tool life under HSM conditions.

关键词： TiAln涂层高速加工 Tin 珩磨治疗 AIP 表面粗糙度时间曲线

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 survival outcomes between laparoscopic versus open radical nephroureterectomy in upper tract urothelial cancer patients:Experiences of a tertiary care single center

引用

Current Urology 2023年第4期17卷 292-298页

作者： Benedikt Hoeh Marina Kosiba Mike Wenzel nicola Meister Felix Preisser Shahrokh F.Shariat Jan Lukas Hohenhorst Andreas Becker philipp Mandel Severine Banek Frederik Roos Pierre I.Karakiewicz Felix K.H.Chun Luis A.Kluth Department of Urology University Hospital FrankfurtGoethe University Frankfurt am MainFrankfurt am Main60590Germany Cancer Prognostics and Health Outcomes Unit Division of UrologyUniversity of Montreal Health CenterMontrealQuebecCanada Department of Urology Comprehensive Cancer CenterMedical University of ViennaViennaAustria Department of Urology Weill Cornell Medical CollegeNew YorkNYUSA Department of Urology University of Texas SouthwesternDallasTXUSA Department of Urology Second Faculty of MedicineCharles UniversityPragueCzech Republic Institute for Urology and Reproductive Health I.M.Sechenov First Moscow State Medical UniversityMoscowRussia Division of Urology Department of Special SurgeryJordan University HospitalThe University of JordanAmmanJordan Martini-Klinik Prostate Cancer Center University Hospital Hamburg-EppendorfHamburgGermany

Objectives:To test for differences in overall and recurrence-free survival between laparoscopic and open surgical approaches in patients undergoing radical nephroureterectomy(RnU)for upper tract urothelial carcinoma(UTUC).Materials and methods:We retrospectively identified patients treated for UTUC from 2010 to 2020 from our institutional *** undergoing laparoscopic or open RnU with no suspicion of metastasis(cM0)were for the current study *** with suspected metastases at diagnosis(cM1)or those undergoing other surgical treatments were *** was performed according to the laparoscopic versus open surgical ***-Meier plots were used to test for differences in overall and recurrence-free survival with regard to the surgical ***,separate Kaplan-Meier plots were used to test the effect of preoperative ureterorenoscopy on overall and recurrence-free survival within the overall study ***:Of the 59 patients who underwent nephroureterectomy,29%(n=17)underwent laparoscopic nephroureterectomy,whereas 71%(n=42)underwent open *** and tumor characteristics were comparable between groups(p≥0.2).The median overall survival was 93 and 73 months in the laparoscopic nephroureterectomy group compared to the open nephroureterectomy group(p=0.5),*** median recurrence-free survival did not differ between open and laparoscopic nephroureterectomies(73 months for both groups;p=0.9).Furthermore,the median overall and recurrence-free survival rates did not differ between patients treated with and without preoperative ***:The results of this retrospective,single-center institution showed that overall and recurrence-free survival rates did not differ between patients with UTUC treated with laparoscopic and open ***,preoperative ureterorenoscopy before RnU was not associated with higher overall or recurrence-free survival rates.

关键词： Upper tract urothelial carcinoma Laparoscopic radical nephroureterectomy Open radical nephroureterectomy Overall survival

来源：评论

学校读者我要写书评

暂无评论

Weave-pattern-dependent fabric piezoelectric pressure sensors based on polyvinylidene fluoride nanofibers electrospun with 50 nozzles

引用

npj Flexible Electronics 2022年第1期6卷 699-707页

作者： Da Bin Kim Ju Han Sun Min Sung Min Seong Kim Bo Kyoung Choi Sung Jun Park Hyae Rim Hong Hong je Choi Byeong Kon Kim Chung Hee Park Jong Hoo Paik Joon-Seok Lee Yong Soo Cho Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Textile Engineering and Technology Yeungnam UniversityGyeongsan 38541Republic of Korea Deparment of Textile Merchandising and Fashion DesignSeoul National UniversitySeoul 08826Republic of Korea Samsung Electro-Mechanics Co.Ltd. Suwon 16674Republic of Korea Ceratorq Inc. Seoul 08511Republic of Korea Electronic Materials and Component Center Korea Institute of Ceramic Engineering and TechnologyJinju 52851Republic of Korea

Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical ***,we introduce piezoelectric pressure sensors based on fabrics woven using polyvinylidene fluoride(PVDF)weft and polyethylene terephthalate(PET)warp yarns with different weave structures:1/1(plain),2/2,and 3/3 weft rib *** dependence of the pressure-sensing performance on the weave pattern is demonstrated with an actual large-scale fabric up to the~2 m *** optimized pressure sensor with a 2/2 weft rib pattern produced a high sensitivity of 83 mV n−1,which was 245%higher than that of the 1/1 *** detection performance of the optimal fabric was extensively evaluated with a variety of ambient input sources,such as pressing,bending,twisting,and crumpling,as well as various human ***,a large allfabric pressure sensor with arrayed touch pixel units demonstrated highly sensitive and stable sensing performance.

关键词： pattern fluoride piezoelectric

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

有机和常规生产系统中甜瓜氮素吸收差异分析

引用

应用与环境生物学报 2009年第2期15卷 197-201页

作者：宋世威 LEHnE philipp 葛体达乐建刚黄丹枫上海交通大学农业与生物学院上海200240 华南农业大学园艺学院广州510642

在甜瓜有机生产系统中,设置3个有机肥料水平处理,即空白(OZ)、半量施肥(OH)和标准施肥(OS),在常规生产系统中设置两个化肥水平处理,即空白(CZ)和正常施肥(CS),以研究有机和常规两种土壤中速效氮的变化及甜瓜对氮素的吸收规律.结果表明,... 详细信息

在甜瓜有机生产系统中,设置3个有机肥料水平处理,即空白(OZ)、半量施肥(OH)和标准施肥(OS),在常规生产系统中设置两个化肥水平处理,即空白(CZ)和正常施肥(CS),以研究有机和常规两种土壤中速效氮的变化及甜瓜对氮素的吸收规律.结果表明,在甜瓜的生长发育过程中,有机肥料向土壤中提供了与常规处理相同水平的速效氮.两种生产系统中甜瓜的生物量和产量差异不显著,且不受施肥水平的影响.甜瓜植株的氮素含量在生育过程中逐渐降低,氮素吸收量逐渐增加,常规处理显著高于有机处理,生产系统内部不同的施肥水平之间差异不显著.常规处理中甜瓜的氮素吸收速率显著高于有机处理,同时植株体内积累了较多的硝态氮从而降低了氮素利用效率.

关键词：有机生产系统甜瓜氮硝态氮利用效率

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

Radiologic factors related to double-bar insertion in minimal invasive repair of pectus excavatum

引用

World Journal of Pediatrics 2015年第2期11卷 148-153页

作者： Ki Hwan Kim Ki Yeol Lee Jung Bok Lee Kyung-Sook Yang Jinwook Hwang Bo Kyung je Hyung Joo Park Department of Radiology Korea University College of MedicineAnsanKorea1 Department of Clinical Epidemiology and Biostatics Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Biostatistics Korea University College of MedicineSeoulKorea Departmentof Thoracic Surgery Korea University College of MedicineAnsanKorea Department of Thoracic and Cardiovascular Surgery Seoul St.Mary's Hospitalthe Catholic University of KoreaSeoulKorea

Background:Pectus excavatum is the most common congenital chest wall deformity,with a high incidence in live *** study aimed to evaluate the measured factors on CT images related to the number of pectus bars for surgical ***:A total of 497 patients who had undergone minimally invasive repair between April 2007 and July 2011 were classified into single-bar(n=358)and doublebar(n=139)insertion *** measured eight distinct distances and one angle on CT scans to reflect quantitative *** analysis and multivariate logistic regression analysis were performed to detect statistically significant association between radiologic measurements and the pectus bars ***:After adjusting for age and gender,the transverse distance(T),the transverse distance of the depression area(A),the inclined distance of the depression area(B),the AP distance of the depression area(C),the depression angle(G),and the eccentric distance of deformity(E)were significantly correlated with double-bar *** regression model showed that age(,Pnder(Pn angle(G)(Pn of the depression(DD)(Pnd depression depth(D)(Pnificantly associated with doublebar ***:CT scan provides useful factors which can be of assistance in predicting the number of pectus bars for the surgical correction of pectus excavatum.

关键词： computed tomography nuss procedure pectus excavatum

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

Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se： An experimental and theoretical study

引用

nano Research 2016年第1期9卷 117-127页

作者： Haiyu Fang je-Hyeong Bahk Tianli Feng Zhe Cheng Amr M. S. Mohammed Xinwei Wang Xiulin Ruan Ali Shakouri Yue Wu School of Chemical Engineering Purdue University West Lafayette IN 47907 USA Birck nanotechnology Center Purdue University West Lafayette IN 47907 USA School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA Department of Mechanical Engineering Iowa State University Ames IA 50011 USA Department of Chemical and Biological Engineering Iowa State University Ames IA 50011 USA

We report the investigation of the thermoelectric properties of large-scale solution-synthesized Bi2Te3 nanocomposites prepared from nanowires hot- pressed into bulk pellets. A third element, Se, is introduced to tune the carrier concentration of the nanocomposites. Due to the Se doping, the thermoelectric figure of merit （ZT） of the nanocomposites is significantly enhanced due to the increased power factor and reduced thermal conductivity. We also find that thermal transport in our hot-pressed pellets is anisotropic, which results in different thermal conductivities along the in-plane and cross-plane directions. Theoretical calculations for both electronic and thermal transport are carried out to establish fundamental understanding of the material system and provide directions for further ZT optimization with adjustments to carrier concentration and mobility.

关键词： Bi2Te3 Se doping solution synthesis nanostructure thermoelectric

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

结直肠癌淋巴结微转移分子检测的研究

结直肠癌淋巴结微转移分子检测的研究

引用

第三届中国肿瘤学术大会

作者：陈功万德森 Texler M Rieger n Hewett PJ Hardingham je 中山大学肿瘤防治中心中山大学肿瘤防治中心 The Queen Elizabeth Hospital South Australia 5011Australia The Queen Elizabeth Hospital South Australia 5011Australia The Queen Elizabeth Hospital South Australia 5011Australia The Queen Elizabeth Hospital South Australia 5011Australia

背景:肿瘤细胞发生的一些微小转移灶,不能被常规的检查手段所发现,多数集中在血液、骨髓和淋巴结等部位,可能是肿瘤复发转移的重要原因,淋巴结微转移就是结直肠癌中比较常见的现象。而现行的常规病理学检查在诊断肿瘤淋巴结微小转移灶... 详细信息

背景:肿瘤细胞发生的一些微小转移灶,不能被常规的检查手段所发现,多数集中在血液、骨髓和淋巴结等部位,可能是肿瘤复发转移的重要原因,淋巴结微转移就是结直肠癌中比较常见的现象。而现行的常规病理学检查在诊断肿瘤淋巴结微小转移灶时存在缺陷和不准确性,因而,寻找更敏感、更特异的方法检测淋巴结微转移成为癌症研究的热点。基于PCR技术的分子生物学实验方法是目前检测肿瘤微小转移的最重要的手段,对肿瘤的准确分期、预后评价和辅助治疗方案的选择均具有重要意义。目的:建立结直肠癌淋巴结微转移的分子检测的实验方法,筛选有效的、特异的肿瘤标记物,并探索多指标联合检测的价值和标准;尝试探索微转移量化研究的可行性和临床价值。材料和方法:应用RT—PCR（reverse transcriptase—polymerase chain reaction,逆转录多聚酶链反应）技术,以CEA（carcinoembryonic antigen,癌胚抗原）、CK-20（cyctokeratin-20,细胞角蛋白20）和GCC（guanylyl cyclaseC,鸟苷酸环化酶C）为肿瘤标记物（目的基因）,多指标联合检测44例结直肠癌患者的淋巴结微转移情况;量化研究时以看家基因（housekeeping gene）Cyclophilin为内对照基因,应用CEA Relative RT-PCR半定量PCR技术将淋巴结组织中表达的CEA与那对照基因作对比,得出CEA的表达率,来代表微小转移的程度,进行微转移量化研究的探索。结果:研究了44例结直肠癌患者的268枚淋巴结,其中组织学阳性47枚;CEA、CK-20和GCC诊断组织学阳性淋巴结转移的阳性率分别为97.9%（46/47）、91.5%（43/47）和95.7%（45/47）,假阳性率分别为6.2%、6.2%和0。221个组织学阴性淋巴结中,RT—PCR联合检测的总阳性率为43.9%（97/221）,其中CEA、GCC为24.9%（55/221）、CK-20 16.7%（37/221）;淋巴结微转移在Ⅲ/Ⅳ期患者中的发生率明显高于Ⅰ/Ⅱ期（50.9%vs 36.2%,p=0.03）;20例Ⅰ/Ⅱ期患者中共有13例（共38枚淋巴结）被RT—PCR诊断为微转移而出现“分子分期上调”。半定量检测显示当CEA表达率大于1时（即淋巴结组织中CEA的表达比内对照基因增加1倍）,微转移为高度危险性,在微转移阳性的13例Ⅰ/Ⅱ期患者中,3例被判断为高度危险性。结论:淋巴结微转移是结直肠癌患者中较常见的现象,RT—PCR是检测的有效手段,CEA、GCC和CK-20是目前比较有效的肿瘤标记物,多指标联合检测能提高特异性,为淋巴结微转移的检测提供了一个新手段;CEARelatire RT—PCR为结直肠癌淋巴结微转移的预后预测提供了量化的标准,开辟了微转移预后评价的新途径。仍需进一步研究来寻找更有效、更特异的标记物。淋巴结微转移在结直肠癌患者中的预后价值仍需要大样本的临床随机对照试验以及长期的临床随访结果来验证。

关键词：结直肠癌淋巴结微转移 RT—PCR

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

电感耦合等离子体发射光谱法测定稀土钢用稀土铁中间合金中钙、镁、硅及镍量

引用

稀土 2023年第6期44卷 98-104,I0005页

作者：杜梅杨学正刘晓杰包头稀土研究院白云鄂博稀土资源研究与综合利用全国重点实验室内蒙古包头014030 稀土冶金及功能材料国家工程研究中心内蒙古包头014030

研究了利用电感耦合等离子体发射光谱仪测定稀土钢用稀土铁中间合金中钙、镁、硅及镍含量的方法。样品中的主成分镧、铈及铁对测定元素无光谱干扰,采用纯试剂工作曲线法进行测定,基体效应用校正系数进行校正。钙、镁、硅及镍的检出限分... 详细信息

研究了利用电感耦合等离子体发射光谱仪测定稀土钢用稀土铁中间合金中钙、镁、硅及镍含量的方法。样品中的主成分镧、铈及铁对测定元素无光谱干扰,采用纯试剂工作曲线法进行测定,基体效应用校正系数进行校正。钙、镁、硅及镍的检出限分别为0.026 ug/mL、0.033 ug/mL、0.075ug/mL、0.033 ug/mL。钙、镁、硅及镍的分析线波长分别为396.847 nm、279.553 nm、212.412 nm、230.299 nm。共存的稀土元素及非稀土元素对测定元素的分析谱线干扰量小于1%,可忽略。测定结果与ICP-MS、AAS、分光光度法的结果一致,加标回收率在96%~102%之间,相对标准偏差(RSD,n=11)小于4%。本方法适用于镧铁、铈铁、镧铈铁等稀土钢用稀土铁中间合金中钙、镁、硅及镍量的测定。

关键词：稀土钢稀土铁合金电感耦合等离子体发射光谱法纯试剂工作曲线法钙镁硅镍

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

Influence of dehydrating agents on the oxidative carbonylation of methanol for dimethyl carbonate synthesis over a Cu/Y-zeolite catalyst

引用

Chinese Journal of Chemical Engineering 2018年第5期26卷 1059-1063页

作者： Dong-Ho Lee Jiin You je-Min Woo Jung Yoon Seo Young Cheol Park Jong-Seop Lee Hyunuk Kim Jong-Ho Moon Seung Bin Park Greenhouse Gas Laboratory Korea Institute of Energy Research Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Energy Material Laboratory Korea Institute of Energy Research

The influence of the dehydration by metal oxides on the synthesis of dimethyl carbonate(DMC) via oxidative carbonylation of methanol was studied. A Cu/Y-zeolite catalyst was prepared by the ion exchange method from CuCl_2·2 H_2O and the commercial nH_4-form of the Y type zeolite. The catalyst was characterized by X-ray fluorescence(XRF), n_2 adsorption(BET method), X-ray diffraction(XRD), and temperature-programmed desorption of ammonia(nH_3-TPD) to evaluate its Cu and Cl content, surface area, structure, and acidity. Reaction tests were carried out using an autoclave(batch reactor) for 18 h at 403 K and 5.5 MPa(2CH_3OH + 1/2O_2+CO?(CH_3O)_2CO + H_2O). The influence of various dehydrating agents(ZnO, MgO, and CaO) was examined with the aim of increasing the methanol conversion(X_(MeOH), MeOH conversion). The MeOH conversion increased upon addition of metal oxides in the order CaO >> MgO > ZnO, with the DMC selectivity(SDMC) following the order MgO >CaO > ZnO. The catalysts and dehydrating agents were characterized before and after the oxidative carbonylation of methanol by thermogravimetric and differential thermogravimetric(TG/DTG), and XRD to confirm that the dehydration reaction occurred via the metal oxide(MO + H_2O → M(OH)_2). The MeOH conversion increased from 8.7% to 14.6% and DMC selectivity increased from 39.0% to 53.1%, when using the dehydrating agent CaO.

关键词：金属氧化物脱水反应催化剂代理人碳酸盐甲醇合成直接数字控制

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

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

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：