检索结果-南通市图书馆

Nanocrystalline Iron Pyrophosphate-Regulated Amorphous Phosphate Overlayer for Enhancing Solar Water Oxidation

Nano-Micro Letters 2022年第12期14卷 387-400页

作者： Chengkai Xia Yuankai Li Minyeong Je Jaekyum Kim Sung Min Cho chang Hyuck choi Heechae choi Tae-Hoon Kim Jung Kyu Kim School of Chemical Engineering Sungkyunkwan University(SKKU)2066 Seobu-roJangan-guSuwon 16419Republic of Korea Theoretical Materials and Chemistry Group Institute of Inorganic ChemistryUniversity of CologneGreinstr.650939 CologneGermany Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Engineering Research CenterChonnam National UniversityGwangju 61186Republic of Korea

A rational regulation of the solar water splitting reaction pathway by adjusting the surface composition and phase structure of catalysts is a substantial approach to ameliorate the sluggish reaction kinetics and improve the energy conversion *** this study,we demonstrate a nanocrystalline iron pyrophosphate(Fe_(4)(P_(2)O_(7))_(3),FePy)-regulated hybrid overlayer with amorphous iron phosphate(FePO_(4),FePi)on the surface of metal oxide nanostructure with boosted photoelectrochemical(PEC)water *** manipulating the facile electrochemical surface treatment followed by the phosphating process,nanocrystalline FePy is localized in the FePi amorphous overlayer to form a heterogeneous hybrid *** FePy-regulated hybrid overlayer(FePy@FePi)results in significantly enhanced PEC performance with long-term *** with the homogeneous FePi amorphous overlayer,FePy@FePi can improve the charge transfer efficiency more significantly,from 60% of FePi to 79%of FePy@*** density-functional theory calculations reveal that the coexistence of FePi and FePy phases on the surface of metal oxide results in much better oxygen evolution reaction kinetics,where the FePi was found to have a typical down-hill reaction for the conversion from OH*to O_(2),while FePy has a low free energy for the formation of OH*.

关键词： Water oxidation Photoelectrochemical cell Metal pyrophosphate Electrochemical surface treatment

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

用于电化学能量转换反应的非贵金属单原子催化剂

引用

Chinese Journal of Catalysis 2023年第7期50卷 195-214页

作者： Sang Eon Jun Sungkyun choi Jaehyun Kim Ki chang Kwon Sun Hwa Park Ho won Jang 首尔国立大学先进材料研究所材料科学与工程系首尔韩国韩国标准与科学研究院跨学科材料测量研究所大田韩国首尔国立大学融合技术高级研究所水原韩国

非贵金属单原子催化剂(NNMSAC)被认为是贵金属单原子催化剂的经济替代品,同时保留了源自单原子位点独特电子结构的高催化活性.通过金属-载体充分的相互作用,NNMSAC可以在各种电催化反应中发挥关键作用,具有与贵金属单原子催化剂相当的... 详细信息

非贵金属单原子催化剂(NNMSAC)被认为是贵金属单原子催化剂的经济替代品,同时保留了源自单原子位点独特电子结构的高催化活性.通过金属-载体充分的相互作用,NNMSAC可以在各种电催化反应中发挥关键作用,具有与贵金属单原子催化剂相当的高原子利用效率和选择性.为此,本文首先综述了NNMSAC在调节反应选择性、金属-载体相互作用和催化活性中心方面的特点.随后,详细介绍了用于析氢反应、析氧反应、氧还原反应、二氧化碳还原反应和氮还原反应的代表性NNMSAC(Co,Ni,Fe,Cu和双金属SAC)催化剂.最后,展望了NNMSAC在几何、电子和电化学性能方面进一步发展所面临的挑战.

关键词：单原子催化剂非贵金属电催化水裂解 CO_(2)还原

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

Interface properties and phase formation between surface coated SKD61 and aluminum alloys

引用

中国有色金属学会会刊：英文版 2009年第4期19卷 875-878页

作者： Se-Weon choi Young-Chan KIM Se-Hun chang Ik-Hyun OH Joon-Sik PARK chang-Seog KANG Automotive Components Center Korea Institute of Industrial Technology Division of Advanced Materials Engineering Hanbat National University

The intermediate phase formation and surface protection effects between SKD61 die mold alloys and aluminum alloys were investigated during a simulated die-casting *** surface coatings of SKD61 alloy were carried out via Si pack cementation coatings at 900 ℃ for 10 h and the ε-FeSi phase *** the coated SKD61 alloy was dipped in the liquid aluminum alloy(ALDC12),the surface coated SKD61 alloys showed better surface properties compared with uncoated SKD61 alloys,i.e.,the intermediate phases(FeSiAl compound) were not produced for the coated SKD61 *** coating layer of ε-FeSi served as a diffusion barrier for the formation of FeSiAl compounds.

关键词：表面涂层铝合金接口特性表面合金涂层表面保护合金生产化合物中间相

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

Stabilization of the Anatase Phase of Ti_(1-x)Sn_(x)O_(2) (x < 0.5) Nanofibers

引用

Nano Research 2010年第4期3卷 256-263页

作者： Kandasami Asokan Jae Young Park Sunwoo choi changhwan chang Sang Sub Kim School of Materials Science and Engineering Inha UniversityIncheon 402-751Republic of Korea Inter-University Accelerator Centre Aruna Asaf Ali MargNew Delhi 110067India Department of Materials Test and Analysis Research Institute of Industrial Science and TechnologyPohang 790-600Republic of Korea

We experimentally investigate the stabilization of the anatase phase of Ti_(1-x)Sn_(x)O_(2)(x<0.5)nanofibers when synthesized by an electrospinning *** as-spun nanofibers became nano-grained,polycrystalline nanofibers after calcination and the diameters of the nanofibers depend on Sn *** of the anatase phase in Ti-rich compositions and incorporation of Sn ions were confirmed by X-ray diffraction,Raman,X-ray absorption near-edge structure,and photoluminescence(PL)*** from the PL study also demonstrated the tunable nature of the optical properties,with the emission maximum shifting towards higher wavelength with increasing Sn concentration.

关键词： Electrospinning nanofiber Ti_(1-x)Sn_(x)O_(2) X-ray absorption near-edge structure(XANES)

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

Congenital stapes suprastructure fixation presenting with fluctuating auditory symptoms:A case report

引用

World Journal of Clinical Cases 2023年第1期11卷 249-254页

作者： Sun choi Seok Hyun Park Ji Su Kim Jiwon chang Department of Otolaryngology-Head and Neck Surgery Kangnam Sacred Heart HospitalHallym University College of MedicineSeoul 07441South Korea

BACKGROUND Stapes ankylosis is a rare cause of conductive hearing loss,and stapes suprastructure fixation is extremely rare with fewer than 30 reported *** usually visit the clinic with non-progressive conductive hearing loss that typically began in the early years of *** SUMMARY Herein,we report a case of a 37-year-old female with an isolated stapedial suprastructure *** patient presented with unusual fluctuating auditory symptoms of tinnitus,ear fullness and mixed hearing ***-operative temporal bone computed tomography findings and operative findings revealed an isolated stapedial suprastructure fixation with monopod stapes caused by elongated pyramidal *** hearing threshold recovered completely,and fluctuating auditory symptoms disappeared after the *** This is the first report of stapedial suprastructure fixation with fluctuating auditory *** results are expected with surgical treatment.

关键词： Isolated stapes ankylosis Stapes suprastructure fixation Elongated pyramidal eminence Stapes monopod Fluctuating auditory symptoms Exploratory tympanotomy Case report

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

Calcium channel blocker monotherapy versus combination with reninangiotensin system inhibitors on the development of new-onset diabetes mellitus in hypertensive Korean patients

引用

Journal of Geriatric Cardiology 2019年第6期16卷 439-447页

作者： Yong Hoon Kim Ae-Young Her Seung-Woon Rha Byoung Geol choi Se Yeon choi Jae Kyeong Byun Yoonjee Park Dong Oh Kang won Young Jang Woohyeun Kim Woong Gil choi Tae Soo Kang Jihun Ahn Sang-Ho Park Ji Young Park Min-Ho Lee Cheol Ung choi chang Gyu Park Hong Seog Seo Division of Cardiology Department of Internal Medicine Kangwon National University School of Medicine Chuncheon South Korea Cardiovascular Center Korea University Guro Hospital Seoul South Korea Department of Medicine Korea University Graduate School Seoul South Korea Cardiology Department Konkuk University Chungju Hospital Chungju South Korea Department of Internal Medicine Cardiovascular Division Dankook University Hospital Cheonan South Korea Department of Cardiology Soonchunhyang University Gumi Hospital Gumi South Korea Cardiology Department Soonchunhyang University Cheonan Hospital Cheonan South Korea Division of Cardiology Department of Internal Medicine Cardiovascular Center Nowon Eulji Medical Center Eulji University Seoul South Korea Department of Cardiology Soonchunhyang University College of Medicine Seoul South Korea

Background In real practice, two or more antihypertensive drugs are needed to achieve target blood pressure. We investigated the comparative beneficial actions of combination therapy of renin-angiotensin system inhibitors (RASI), with calcium channel blockers (CCB) over CCB monotherapy on the development of new-onset diabetes mellitus (NODM) in Korean patients during four-year follow-up periods. Methods A total of 3208 consecutive hypertensive patients without a history of diabetes mellitus who had been prescribed CCB were retrospectively enrolled from January 2004 to December 2012. These patients were divided into the two groups according to the additional use of RASI (the RASI group, n = 1221 and the no RASI group, n = 1987). Primary endpoint was NODM, defined as a fasting blood glucose ≥ 126 mg/dL or hemoglobin A1c ≥ 6.5%. Secondary endpoint was major adverse cardiac events (MACE) defined as total death, myocardial infarction (MI) and percutaneous coronary intervention (PCI). Results After propensity score-matched (PSM) analysis, two propensity- matched groups (939 pairs, n = 1878, C-statistic = 0.743) were generated. The incidences of NODM (HR = 1.009, 95% CI: 0.700–1.452, P = 0.962), MACE (HR = 0.877, 95% CI: 0.544–1.413, P = 0.589), total death, MI, PCI were similar between the two groups after PSM during four years. Conclusions The use of RASI in addition to CCB showed comparable incidences of NODM and MACE compared to CCB monotherapy in non-diabetic hypertensive Korean patients during four-year follow-up period. However, large-scaled randomized controlled clinical trials will be required for a more definitive conclusion.

关键词： Calcium channel blocker Diabetes mellitus Renin-angiotensin system inhibitors

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

Predictive factors for interferon and ribavirin combination therapy in patients with chronic hepatitis C

引用

World Journal of Gastroenterology 2007年第46期13卷 6236-6242页

作者： Joonho Yoon Jong In Lee Soon Koo Baik Kwang Ho Lee Joon Hyung Sohn Hyean-Woo Lee Jun Namkung Sei Jin chang Jong-Whan choi Hyun-won Kim Byung-Il Yeh Department of Biochemistry and Institute of Basic Medical Sciences Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Internal Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Internal Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Anesthesiology Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Biochemistry and Institute of Basic Medical Sciences Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Preventive Medicine and Institute of Occupational Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea

AIM： To confirm the predictive factors for interferon （IFN）-α and ribavirin combination therapy for chronic hepatitis patients with hepatitis C virus （HCV） genotype lb. METHODS： HCV RNA from 50 patients infected with HCV genotype lb was studied by cloning and sequencing of interferon sensitivity determining region （ISDR）, PKR- eIF2α phosphorylation homology domain （PePHD）. Patients were treated with IFN-α and ribavirin for 6 mo and grouped by effectiveness of the therapy. A variety of factors were analyzed. RESULTS： Our data showed that age, HCV RNA titer, and ISDR type could be used as the predictive factors for combined IFN-α and ribavirin efficacy. Characteristically, mutations in PePHD appeared only when the combination therapy was effective. Other factors, such as sex and alanine aminotransferase （ALT） level, were not related to its efficacy. Adjusting for age and HCV RNA titer indicated that the ISDR type was the most potent predictive factor. CONCLUSION： HCV RNA ISDR type is an important factor for predicting efficacy of IFN-α and ribavirin combination therapy in Korean patients.

关键词： Hepatitis C virus -lb Interferon-m Ribavirin Interferon sensitivity determining region PKR-eIF2α phosphorylation homology domain

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

Correlation of fatty liver and abdominal fat distribution using a simple fat computed tomography protocol

引用

World Journal of Gastroenterology 2011年第28期17卷 3335-3341页

作者： Seonah Jang chang Hee Lee Kyung Mook choi Jongmee Lee Jae Woong choi Kyeong Ah Kim Cheol Min Park Department of Radiology Korea University Guro HospitalKorea University College of Medicine Department of Internal Medicine (Division of Endocrinology and Metabolism) Korea University Guro HospitalKorea University College of Medicine

AIM: To evaluate the relationship between hepatic fat infiltration and abdominal fat volume by using computed tomography (CT).METHODS: Three hundred and six patients who visited our obesity clinic between November 2007 and April 2008 underwent fat protocol CT *** age range of the patients was 19 to 79 years and the mean age was 49 *** male to female ratio was 116:*** and spleen attenuation measurements were taken with three regions of interests (ROIs) from the liver and two ROIs from the *** attenuation indices (HAIs) were measured as follows: (1) hepatic parenchymal attenuation (CTLP);(2) liver to spleen attenuation ratio (LS ratio);and (3) difference between hepatic and splenic attenuation (LSdif).Abdominal fat volume was measured using a 3 mm slice CT scan starting at the level of the umbilicus and was automatically calculated by a *** fat was classified into total fat (TF),visceral fat (VF),and subcutaneous fat (SF).We used a bivariate correlation method to assess the relationship between the three HAIs and TF,VF,and ***: There were significant negative correlations between CTLP,LS ratio,and LSdif with TF,VF,and SF,*** CTLP showed a strong negative correlation with TF and VF (r = -0.415 and -0.434,respectively,P < 0.001).The correlation between CTLP and SF was less significant (r = -0.313,P < 0.001).CONCLUSION: Fatty infiltration of the liver was correlated with amount of abdominal fat and VF was more strongly associated with fatty liver than SF.

关键词： Steatosis Computed tomography Abdominal fat Visceral fat Subcutaneous fat

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

Highly ordered lead-free double perovskite halides by design

引用

Journal of Materiomics 2020年第4期6卷 651-660页

作者： chang won Ahn Jae Hun Jo Jong Chan Kim Hamid Ullah Sangkyun Ryu Younghun Hwang Jin San choi Jongmin Lee Sanghan Lee Hyoungjeen Jeen Young-Han Shin Hu Young Jeong Ill won Kim Tae Heon Kim Department of Physics and Energy Harvest-Storage Research Center(EHSRC) University of UlsanUlsan44610Republic of Korea UNIST Central Research Facilities(UCRF)&School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Multiscale Materials Modelling Laboratory Department of PhysicsUniversity of UlsanUlsan44610Republic of Korea Department of Physics Pusan National UniversityPusan46241Republic of Korea School of Electrical and Electronics Engineering Ulsan CollegeUlsan44610Republic of Korea School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea

Lead-free double perovskite halides are emerging optoelectronic materials that are alternatives to leadbased perovskite ***,single-crystalline double perovskite halides were synthesized,and their intriguing functional properties were *** such pioneering works,lead-free double perovskite halides with better crystallinity are still in demand for applications to novel optoelectronic ***,we realized highly crystalline Cs2AgBiBr6 single crystals with a well-defined atomic ordering on the microscopic *** avoided the formation of Ag vacancies and the subsequent secondary Cs3Bi2Br9 by manipulating the initial chemical environments in hydrothermal *** suppression of Ag vacancies allows us to reduce the trap density in the as-grown crystals and to enhance the carrier mobility *** design strategy is applicable for fabricating other lead-free halide materials with high crystallinity.

关键词： Cs2AgBiBr6 Lead-free Double perovskite Single crystal

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

Crystal Facet Engineering of TiO_(2) Nanostructures for Enhancing Photoelectrochemical Water Splitting with BiVO_(4) Nanodots

引用

Nano-Micro Letters 2022年第3期14卷 201-215页

作者： Mi Gyoung Lee Jin Wook Yang Hoonkee Park Cheon Woo Moon Dinsefa M.Andoshe Jongseong Park chang‑Ki Moon Tae Hyung Lee Kyoung Soon choi Woo Seok Cheon Jang‑Joo Kim Ho won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Department of Chemistry and Nanoscience Ewha Womans UniversitySeoul 03693Republic of Korea National Research Facilities and Equipment Center Korea Basic Science InstituteDaejeon 34133Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

Although bismuth vanadate(BiVO4)has been promising as photoanode material for photoelectrochemical water splitting,its charge recombination issue by short charge diffusion length has led to various studies about heterostructure *** a hole blocking layer of BiVO4,titanium dioxide(TiO_(2)) has been considered unsuitable because of its relatively positive valence band edge and low electrical ***,a crystal facet engineering of TiO_(2) nanostructures is proposed to control band structures for the hole blocking layer of BiVO4 *** design two types of TiO_(2) nanostructures,which are nanorods(NRs)and nanoflowers(NFs)with different(001)and(110)crystal facets,respectively,and fabricate BiVO4/TiO_(2) heterostructure *** BiVO4/TiO_(2) NFs showed 4.8 times higher photocurrent density than the BiVO4/TiO_(2) *** decay time analysis and time-resolved photoluminescence reveal the enhancement is attributed to the reduced charge recombination,which is originated from the formation of type II band alignment between BiVO4 nanodots and TiO_(2) *** work provides not only new insights into the interplay between crystal facets and band structures but also important steps for the design of highly efficient photoelectrodes.

关键词： Crystal facet control Bismuth vanadate Titanium dioxide Heterojunction Water splitting

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：