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RISS 인기검색어
- 검색키워드
- 저자 : Fey, George Ting-Kuo (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Long-Cycling Coated LiCoO₂ Cathodes for Lithium Batteries : A Review
Fey, George Ting-Kuo,Kumar, T. Prem 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
The improved cycling properties of coated LiCoO₂cathodes are reviewed in this article. Three methods of coating: sol-gel, precipitation and mechano-thermal, are discussed. Both simple oxides such as Al₂O₃, SiO₂, TiO₂, ZrO₂, etc. and mixed oxides such as MgAl₂O₄ and ZrTiO₄ are compared as coating materials and, where possible, studies of nanomaterial coatings of the above are incorporated. Additionally, there is a brief comparison of the sol-gel and mechano-thermal coating methods. Structural data and morphology of the oxide-coated cathodes are correlated with electrochemical behavior. The enhanced cyclability is attributed to the suppression of cycle-limiting phase transitions. When a strong thin film of nanomaterial coating prevents the cathode from expanding structurally and dissolving into the electrolyte, cyclability is substantially enhanced. Furthermore, mixed oxide-coated cathodes demonstrate greater cycability than corresponding individual oxide-coated cathodes. Using Al₂O₃ as an example, the effect of precursor selection for the coating oxide on the cyclability of the coated cathodes is also discussed.
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Analysis of New, Energy-Efficient Hydraulic Unit for Machine Tools
Christian Brecher,David Jasper,Marcel Fey 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.1
In machine tools, hydraulic units are one of the main consumers of energy. Hydraulically driven functionalities of machine tools include tool clamping, tool change, work piece clamping or palette change operating. For these functions, two pressure circuits (60 bar and 200 bar) are necessary. This paper introduces a novel, energy-efficient hydraulic unit that combines a variable displacement pump with a variable speed controlled drive and hydraulic booster. The result is a lower overall energy consumption and decreased operating temperatures of the hydraulic unit. Hydraulic fluids contain up to 85% mineral oil. This paper also introduces a mineral oil-free, water-based hydraulic fluid, which will be replacing a conventional mineral oil-based hydraulic fluid (ISO-VG 46) within the novel energy-efficient hydraulic unit. The effects on the unit’s performance (operating temperature, pressure, flow rate, power consumption, efficiency) will be evaluated.
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Molecular Surveillance Identifies Multiple Transmissions of Typhoid in West Africa
Wong, Vanessa K.,Holt, Kathryn E.,Okoro, Chinyere,Baker, Stephen,Pickard, Derek J.,Marks, Florian,Page, Andrew J.,Olanipekun, Grace,Munir, Huda,Alter, Roxanne,Fey, Paul D.,Feasey, Nicholas A.,Weill, F Public Library of Science 2016 PLoS neglected tropical diseases Vol.10 No.9
<▼1><P><B>Background</B></P><P>The burden of typhoid in sub-Saharan African (SSA) countries has been difficult to estimate, in part, due to suboptimal laboratory diagnostics. However, surveillance blood cultures at two sites in Nigeria have identified typhoid associated with <I>Salmonella enterica</I> serovar Typhi (<I>S</I>. Typhi) as an important cause of bacteremia in children.</P><P><B>Methods</B></P><P>A total of 128 <I>S</I>. Typhi isolates from these studies in Nigeria were whole-genome sequenced, and the resulting data was used to place these Nigerian isolates into a worldwide context based on their phylogeny and carriage of molecular determinants of antibiotic resistance.</P><P><B>Results</B></P><P>Several distinct <I>S</I>. Typhi genotypes were identified in Nigeria that were related to other clusters of <I>S</I>. Typhi isolates from north, west and central regions of Africa. The rapidly expanding <I>S</I>. Typhi clade 4.3.1 (H58) previously associated with multiple antimicrobial resistances in Asia and in east, central and southern Africa, was not detected in this study. However, antimicrobial resistance was common amongst the Nigerian isolates and was associated with several plasmids, including the IncHI1 plasmid commonly associated with <I>S</I>. Typhi.</P><P><B>Conclusions</B></P><P>These data indicate that typhoid in Nigeria was established through multiple independent introductions into the country, with evidence of regional spread. MDR typhoid appears to be evolving independently of the haplotype H58 found in other typhoid endemic countries. This study highlights an urgent need for routine surveillance to monitor the epidemiology of typhoid and evolution of antimicrobial resistance within the bacterial population as a means to facilitate public health interventions to reduce the substantial morbidity and mortality of typhoid.</P></▼1><▼2><P><B>Author Summary</B></P><P>Typhoid fever, a serious bloodstream infection caused by the bacterium <I>Salmonella</I> Typhi, is a major cause of disease and death around the world. There have been limited data on the epidemiology of typhoid in many countries in sub-Saharan African, including Nigeria. Recent evidence, however, showed that typhoid was an important cause of bacteraemia in children residing in two regions of Nigeria. Here, we analyzed the whole genome sequences of 128 <I>S</I>. Typhi isolates from two studies in order to elucidate the population structure and characterize the genetic components of antimicrobial resistance. We found that the multiple <I>S</I>. Typhi genotypes identified were closely related to other <I>S</I>. Typhi from neighboring regions of Africa and that multidrug resistance (MDR) was common among these isolates, and in many cases was associated with the IncHI1 plasmid known to cause MDR typhoid. These results provide evidence that typhoid was established in Nigeria as a result of several independent introductions into the country and that there has been extensive exchange of <I>S</I>. Typhi in and around the region of West Africa. This study emphasizes the importance of surveillance to improve our understanding of the epidemiology of typhoid, which is needed to underpin public health measures to reduce the spread of disease and facilitate patient management.</P></▼2>
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