检索结果-南通市图书馆

Zircon U-Pb ages and O-Hf isotopes of Quaternary trachytes from the East Sea:Implications for the genesis of low-δ^(18)O magmas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第2期15卷 41-54页

作者： Hyun-Ok choi Jihye Oh Chang Hwan Kim soon Young choi Won Hyuck Kim Chan Hong Park Dokdo Research Center East Sea Research InstituteKorea Institute of Ocean Science and TechnologyUljin 36315Republic of Korea Deep-Sea and Seabed Mineral Resources Research Center Korea Institute of Ocean Science and TechnologyBusan 49111Republic of Korea Division of Science Education Kangwon National University1 Gangwondaehak-gilChuncheon-siGangwon-do 24341Republic of Korea

Quaternary intraplate magmatism formed several volcanic islands and seamounts,including Dokdo(DD),Ulleungdo(UD),Simheungtack(ST),Anyongbok,and Isabu in the southwest of the East Sea back-arc *** this study,we present whole-rock geochemical,zircon U–Pb age,and in situ O–Hf isotope data for the submerged volcanic rocks from DD,UD,and ST to provide new insights into the eruption timing of these volcanoes and constrain the magma evolution *** samples used in this study were trachytes and exhibited ferroan,alkalic,and metaluminous to weakly peraluminous *** showed light rare earth element(REE)-enriched patterns with(La/Yb)N ratios of 25.3–31.7 and mostly negative Eu anomalies in a chondrite-normalized REE *** addition,they were enriched in large-ion lithophile elements and high field strength elements;they exhibited positive Pb anomalies and strongly negative Ba,Sr,P,and Ti *** zircons yielded a weighted-mean 206Pb/238U age of 2.61,0.348–0.704,and 2.76–2.94 Ma for the DD,UD,and ST trachytes,*** zircons exhibited lowerδ^(18)O values than normal depleted mantle values,regardless of the crystallization age and spatial distribution of ***δ^(18)O values showed no correlation with U contents or Th/U ratios,indicating that the lowδ^(18)O signatures were of primary magmatic *** Hf isotopic compositions of the zircons were relatively heterogeneous but predominately characterized by positive eHf *** O–Hf mixing modeling revealed that low-δ^(18)O rocks with positive eHf values from the UD and ST volcanoes were derived from a hybrid source of recycled juvenile crustal materials with low-δ^(18)O and positive eHf signatures and an enriched mantle source with normalδ^(18)O and negative eHf *** juvenile oceanic crust in the source was likely metasomatized by seawater at high temperatures prior to *** contrast,the felsic magma that formed the DD volcanoes may have assimilated with regional

关键词： Quaternary intraplate volcanism East Sea Zircon O-Hf isotopes Low-δ^(18)O magma Recycled juvenile oceanic crust

Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第1期88卷 317-326,I0008页

作者： Devthade Vidyasagar Yeonghun Yun Jae Yu Cho Hyemin Lee Kyung Won Kim Yong Tae Kim Sung Woong Yang Jina Jung Won Chang choi Seonu Kim Rajendra Kumar Gunasekaran Seok beom Kang Kwang Heo Dong Hoe Kim Jaeyeong Heo Sangwook Lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering and Optoelectronics Convergence Research CenterChonnam National UniversityGwangju 61186Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea

Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transferdynamics of perovskite solar cells(PSCs).Herein,we report a facile but powerful method to functionalize the surface of 2PACz-SAM,by which reproducible,highly stable,high-efficiency wide-bandgap PSCs can be *** 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM,which increases perovskite grain size,retards halide segregation,and accelerates hole *** surface functionalization achieves a high power conversion efficiency(PCE)of 17.62%for a single-junction wide-bandgap(~1.77 e V)*** also demonstrate a monolithic all-perovskite tandem solar cell using surfaceengineered HSC,showing high PCE of 24.66%with large open-circuit voltage of 2.008 V and high fillfactor of 81.45%.Our results suggest this simple approach can further improve the tandem device,when coupled with a high-performance narrow-bandgap sub-cell.

关键词： Perovskite solar cells 2PACz Monolithic tandem solar cells Wide bandgap

小型的末端重复反转录转座子(Terminal-Repeat Retrotransposon In Miniature,TRIM)元件和作为芸薹属DNA分子标记的潜在用途(英文)

在线全文

学校读者我要写书评

暂无评论

小型的末端重复反转录转座子(Terminal-Repeat Retrotransposon I...

Long-term outcomes of endoscopic submucosal dissection for undifferentiated type early gastric cancer over 2 cm with R0 resection

第十二届国际油菜大会

作者： Tae-Jin Yang Soo-Jin Kwon Jung Sun Kim beom-soon choi Yong Pyo Lim beom-Seok Park Department of Plant Science College of Agriculture and Life SciencesSeoul National UniversitySan 56-1Sillim-dongGwanak-gu Seoul151-744 Korea Brassica Genomics Team National Institute of Agricultural Biotechnology (NIAB)RDASuwon441-707Korea Department of Horticulture Chungnam National UniversityDaejeon305-764 Korea

基于对基因组中的末端重复反转录转座子元件广泛搜索和分离,我们分析了八个TRIM家族的特性:十字花科中四个来自甘蓝,四个来自拟南芥(包括以前分离的三个家族)。这些元件包括10057bp的末端重复序列(TR)和10000bp的内部序列。插入位点的... 详细信息

基于对基因组中的末端重复反转录转座子元件广泛搜索和分离,我们分析了八个TRIM家族的特性:十字花科中四个来自甘蓝,四个来自拟南芥(包括以前分离的三个家族)。这些元件包括10057bp的末端重复序列(TR)和10000bp的内部序列。插入位点的多态性可与十字花科的分类和每个元件插入的时间相关联。TRIM展示实验显示十字花科不同的属间和中国大白菜与萝卜F1代存在大量的多态性,这些结果表明TRIM元件可以作为DNA标记来研究芸薹属作物的基因组进化、基因组作图和品种保护。TRIM元件的其它优点包括序列短、优先插入常染色质,而且在拟南芥基因组中发布广泛。

关键词： Brassica Arabidopsis TRIM Retrotransposon DNA Markers

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

World Journal of Gastrointestinal Endoscopy 2024年第6期16卷 326-334页

作者： Jun Yong Bae Chang beom Ryu Moon Sung Lee Kulwinder S Dua Internal Medicine and Digestive Disease Center Seoul Medical CenterSeoul 02053South Korea Internal Medicine and Digestive Disease Center and Research Institute Soon Chun Hyang University of School of MedicineBucheon 14584South Korea Department of Medicine Medical College of WisconsinMilwaukeeWI 53226United States

BACKGROUND Endoscopic submucosal dissection(ESD)for over 2 cm in size undifferentiated type(UD type)early gastric cancer(EGC)confined to the mucosa is not only challenging,but also long-term outcomes are not well *** To evaluate the long-term outcomes of ESD done for UD type EGCs confined to the mucosa over 2 cm in size and compare the results with those where the lesions were less than 2 *** 143 patients with UD type EGC confirmed on histology after ESD at a tertiary hospital were *** with synchronous and metachronous lesions and a case with emergency surgery after ESD were excluded.A total of 137 cases were enrolled.79 cases who underwent R0 resection were divided into 2 cm or less(group A)and over 2 cm(group B)in *** Among 79 patients who underwent R0 resection,the number in group A and B were 51 and 28,*** mean follow-up period(SD)was 79.71±45.42 *** was a local recurrence in group A(1/51,2%)and group B(1/28,3.6%)*** patient in group A underwent surgery while the patient in group B underwent repeated ESD with no further recurrences in both *** was no regional lymph node metastasis,distant metastasis,and deaths in both *** R0 resection strategy for ESD on lesions over 2 cm,20.4%(28/137)of patients were able to avoid surgery compared with expanded *** If R0 resection is achieved by ESD,UD type EGCs over 2 cm also showed good and similar clinical outcomes as compared to lesions less than 2 cm when followed for over 5 *** R0 resection strategy,several patients can avoid surgery.

关键词： Undifferentiated type early gastric cancer Endoscopic submucosal dissection Long term outcomes Over 2 cm Early gastric cancer

High-Performance Perovskite Quantum Dot Solar Cells Enabled by Incorporation with Dimensionally Engineered Organic Semiconductor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第12期14卷 272-285页

作者： Seyeong Lim Dae Hwan Lee Hyuntae choi Yelim choi Dong Geon Lee Sung beom Cho Seonkyung Ko Jongmin choi Younghoon Kim Taiho Park Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea Center of Materials Digitalization Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea

Perovskite quantum dots(PQDs)have been considered promising and effective photovoltaic absorber due to their superior optoelectronic properties and inherent material merits combining perovskites and ***,they exhibit low moisture stability at room humidity(20-30%)owing to many surface defect sites generated by inefficient ligand exchange *** surface traps must be re-passivated to improve both charge transport ability and moisture *** address this issue,PQD-organic semiconductor hybrid solar cells with suitable electrical properties and functional groups might dramatically improve the charge extraction and defect *** organic semiconductors are typically low-dimensional(1D and 2D)and prone to excessive self-aggregation,which limits chemical interaction with *** this work,we designed a new 3D star-shaped semiconducting material(Star-TrCN)to enhance the compatibility with *** robust bonding with Star-TrCN and PQDs is demonstrated by theoretical modeling and experimental *** Star-TrCN-PQD hybrid films show improved cubic-phase stability of CsPbI_(3)-PQDs via reduced surface trap states and suppressed moisture *** a result,the resultant devices not only achieve remarkable device stability over 1000 h at 20-30%relative humidity,but also boost power conversion efficiency up to 16.0%via forming a cascade energy band structure.

关键词： CsPbI3 quantum dots Star-shaped organic semiconductors Hybrid perovskite quantum dots Solar cell stability High-efficiency photovoltaics

Submergence promotes auxin-induced callus formation through ethylene-mediated post-transcriptional control of auxin receptors

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2022年第12期15卷 1947-1961页

作者： Seung Yong Shin Yuri choi Sang-Gyu Kim Su-Jin Park Ji-Sun Park Ki-beom Moon Hyun-soon Kim Jae Heung Jeon Hye Sun Cho Hyo-Jun Lee Plant Systems Engineering Research Center Korea Research Institute of Bioscience and BiotechnologyDaejeon 34141Korea Department of Functional Genomics KRIBB School of BioscienceUniversity of Science and TechnologyDaejeon 34113Korea Department of Biological Sciences Korea Advanced Institute of Science and TechnologyDaejeon 34141Korea Department of Biosystems and Bioengineering KRIBB School of BiotechnologyUniversity of Science and TechnologyDaejeon 34113Korea Department of Biological Sciences Sungkyunkwan UniversitySuwon 16419Korea

Plant cells in damaged tissue can be reprogrammed to acquire pluripotency and induce callus ***,in the aboveground organs of many species,somatic cells that are distal to the wound site become less sensitive to auxin-induced callus formation,suggesting the existence of repressive regulatory mechanisms that are largely *** we reveal that submergence-induced ethylene signals promote callus formation by releasing post-transcriptional silencing of auxin receptor transcripts in non-wounded *** determined that short-term submergence of intact seedlings induces auxin-mediated cell dedifferentiation across the entirety of Arabidopsis thaliana *** constitutive triple response 1-1(ctr1-1)mutation induced callus formation in explants without submergence,suggesting that ethylene facilitates cell *** show that ETHYLENE-INSENSITIVE 2(EIN2)post-transcriptionally regulates the abundance of transcripts for auxin receptor genes by facilitating microRNA393 ***-induced calli in non-wounded regions were suitable for shoot regeneration,similar to those near the wound *** also observed submergence-promoted callus formation in Chinese cabbage(Brassica rapa),indicating that this may be a conserved mechanism in other *** study identifies previously unknown regulatory mechanisms by which ethylene promotes cell dedifferentiation and provides a new approach for boosting callus induction efficiency in shoot explants.

关键词： cell dedifferentiation auxin signaling ethylene callus formation EIN2

Metasurface doublet-integrated bidirectional grating antenna enabling enhanced wavelength-tuned beam steering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2022年第1期10卷 248-255页

作者： WOO-BIN LEE CHUL-soon IM CHANGYI ZHOU BISHAL BHANDARI DUK-YONG choi SANG-SHIN LEE Department of Electronic Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Nano Device Application Center Kwangwoon UniversitySeoul 01897Republic of Korea Laser Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia

We propose and demonstrate an optical phased-array-based bidirectional grating antenna(BDGA) in silicon nitride *** BDGA is integrated with a miniaturized all-dielectric metasurface doublet(MD) formed on a glass *** BDGA device,which takes advantage of alternately feeding light to its ports in opposite directions,is presumed to effectively provide a doubled wavelength-tuned steering efficiency compared to its unidirectional *** MD,which is based on vertically cascaded convex and concave metalenses comprising circular hydrogenated amorphous silicon nanopillars,is meticulously placed atop the BDGA chip to accept and deflect a beam emanating from the emission area,thereby boosting the beam-steering *** manufactured BDGA could achieve an enhanced beam-steering efficiency of 0.148 deg/nm as well as a stable spectral emission response in the wavelength range of 1530–1600 *** deploying a fabricated MD atop the silicon photonic BDGA chip,the steering efficiency was confirmed to be boosted by a factor of ~3.1,reaching 0.461 deg/nm,as intended.

关键词： beam thereby directions

Novel ternary metals-based telluride electrocatalyst with synergistic effects of high valence non-3d metal and oxophilic Te for pH-universal hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 736-743,I0015页

作者： Seunghwan Jo Wenxiang Liu Yanan Yue Ki Hoon Shin Keon beom Lee Hyeonggeun choi Bo Hou Jung Inn Sohn Division of Physics and Semiconductor Science Dongguk UniversitySeoul 04620Republic of Korea School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072HubeiChina School of Physics and Astronomy Cardiff UniversityCardiff CF243AAWalesUK

Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline HER ***,we design ternary transition metals-based nickel telluride(Mo WNi Te)catalysts consisting of high valence non-3d Mo and W metals and oxophilic Te as a first demonstration of non-precious heterogeneous electrocatalysts following the bifunctional *** Mo WNi Te showed excellent HER catalytic performance with overpotentials of 72,125,and 182 mV to reach the current densities of 10,100,and 1000 mA cm^(-2),respectively,and the corresponding Tafel slope of 47,52,and 58 mV dec-1in alkaline media,which is much superior to commercial Pt/***,the HER performance of Mo WNi Te is well maintained up to 3000 h at the current density of 100 mA cm^(-2).It is further demonstrated that the Mo WNi Te exhibits remarkable HER activities with an overpotential of 45 mV(31 mV)and Tafel slope of 60 mV dec-1(34 mV dec-1)at 10 mA cm^(-2)in neutral(acid)*** superior HER performance of Mo WNi Te is attributed to the electronic structure modulation,inducing highly active low valence states by the incorporation of high valence non-3d transition *** is also attributed to the oxophilic effect of Te,accelerating water dissociation kinetics through a bifunctional catalytic mechanism in alkaline *** functional theory calculations further reveal that such synergistic effects lead to reduced free energy for an efficient water dissociation process,resulting in remarkable HER catalytic performances within universal pH environments.

关键词： Telluride catalyst Oxophilic effect High valence non-3d metal Bifunctional mechanism pH-universal hydrogen evolution reaction

Dietary sophorolipid accelerates growth by modulation of gut microbiota population and intestinal environments in broiler chickens

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2022年第1期13卷 256-264页

作者： Min-Jin Kwak Min-Young Park Yong-soon choi Junghwan Cho Duleepa Pathiraja Jonggun Kim Hanbae Lee In-Geol choi Kwang-Youn Whang Department of Biotechnology Korea University145 Anam-roSeoul 02841Republic of Korea Pathway Intermediates Seoul 02841Republic of Korea

Background:Gut is a crucial organ for the host’s defense system due to its filtering action of the intestinal membrane from hazardous foreign *** strategy to strengthen the gut epithelial barrier function is to upregulate beneficial microflora populations and their ***(SPL),which is a glycolipid biosurfactant,could increase beneficial microflora and decrease pathogenic bacteria in the gastrointestinal ***,herein,we conducted an experiment with broiler chickens to investigate the fortifying effects of SPL on the host’s gut defense system by modulating the microbiota ***:A total of 5401-day-old chicks(Ross 308)were used,and they were immediately allotted into three treatment groups(6 replications with 30 chicks/pen)according to their initial body *** dietary treatments consisted of CON(basal diet),BAM(10 mg/kg bambermycin),and SPL(10 mg/kg SPL).During the experiment,birds freely accessed feed and water,and body weight and feed intake were measured at the end of each *** d 35,birds(one bird/pen)were sacrificed to collect jejunum and cecum ***:Dietary SPL and BAM supplementation significantly accelerated birds’growth and also significantly improved feed efficiency compared to *** microbial community was significantly separated by dietary SPL supplementation from that of CON,and dietary SPL supplementation significantly increased Lactobacillus *** Akkermansia ***,birds fed with dietary SPL also showed the highest concentration of cecal butyrate among all treatment *** morphological analysis showed that dietary SPL significantly increased villus height,ratio of villus height to crypt depth,goblet cell numbers,and the gene expression levels of claudin-1 and mucin ***,dietary SPL significantly decreased the mRNA expression level of pro-inflammatory cytokine,interleukin-6,and increased that of anti-inflammatory cytokine,interleukin-10,compared

关键词： Broilers Gut microbiota Gut morphology Local inflammation Mucus barrier Sophorolipids