Materials Literature
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Abstract: The Urea-SCR system commercialized shows a remarkable performance to reduce NOx emission in heavy duty diesel engines. However, Urea-water solution injected upstream a mixer, which is set up inside a exhaust pipe to promote exhaust gas-atomized droplet mixing, bumps up against the wall of a exhaust pipe as t…
본 논문에서는 전동기의 속도 센서로 사용되는 마그네틱 센서의 3차원 전자장 해석 기술 및 분석 방법에 대하여 논하였다. 마그네틱 센서는 레졸버 및 엔코더와 같은 속도센서에 비해 가격이 싸고 활용성이 높은 장점이 있는 반면, 정밀도가 낮으며 외부 자기장에 대하여 간섭을 많이 받는 단점이 존재한다. 마그네틱 센서는 전동기가 회전할 때 사인과 코사인 파형이 발생된다. 그러나 홀 소자 근처에서의 자기적 노이즈로 인하여 사인 및 코사인 신호가 왜곡이 발생하여 각도 오차로 나타난다. 본 논문에서는 마그네틱 센서의 홀 소자의 적절한 위치 선정과 주위에 적절한 요크를 다꾸찌 방법…
Photoactivatable or “caged” derivatives of signaling molecules are important tools for manipulating intracellular events with spatial and temporal resolution. In their Communication on page 6330 ff., C. Schultz and co-workers demonstrate that regionally limited photoactivation simultaneously leads to a local protein k…
This paper describes the fabrication and characterization of graphene based carbon dioxide ( $CO_2$ ) gas sensors. Graphene was synthesized by thermal decomposition of SiC. The resistivity $CO_2$ gas sensors were fabricated by pure graphene and graphene decorated Au nanoparticles (NPs). The Au NPs with size of 10 nm w…
본 연구는 혈류에 의한 조영제 peak time을 산출하는 새로운 방법을 개발하여 기존의 수식에 의한 부작용을 최소화 하고, 대체할 수 있는 새로운 검사법을 제시하고자 하였다. 시험적조영제주입법을 이용하여 CE MRA를 검사한 환자 127명을 대상으로, 기존의 수식에 의해 산출된 조영제 peak time이 조영제 주입 후 혈류에 의한 영상화 범위의 어느 뇌혈관 측정값과 일치하는지 각 뇌혈관의 조영제 inflow time과 peak time을 측정하였다. 연구결과, 유의수준 0.05에 대한 4개의 집단 간 차이가 존재하였으나 집단 1에서 수식에 의해 산출된 조영제 p…
Triboluminescent phosphors provide a method for converting kinetic signals to optical signals for particle detection. Several methods, including vapor deposition, electron beam, and spray-on were evaluated for depositing a thin translucent coating of ZnS:Mn phosphor material onto transparent substrates. The objective…
A The Economist 2009.júliusi számában (1) arról ír, hogy a közelmúltban és napjainkban zajló pénzügyi és gazdasági krízis a közgazdaságtan hitelét és hírnevét nagymértékben rontotta.A 2008-as világválságot megelőző vezető közgazdasági elméletek már nem tudnak teljes körűen magyarázatot adni a jelenlegi gazdasági folya…
A lightweight single-aperture and multi-spectral sensor operating from Visible to LWIR has been designed, manufactured and tested exploiting a Three Mirror Anastigmat (TMA) telescope featuring thin free-form mirrors electroformed from negative masters. Manufacturing complexity is in place only for the master realizati…
본 연구에서는 고주파 마그네트론 스퍼터링법으로 기판온도 변화에 따른 GZO 박막을 투명 사파이어 기판위에 제작하여, 박막의 전기적 광학적 특성 및 결정화 특성을 조사하였다. 전기적 특성을 조사한 결과, 기판온도 $300^{\circ}C$ 에서 가장 낮은 $4.18{\times}10^{-4}{\Omega}cm$ 의 비저항을 나타내었고, 이때의 캐리어 농도는 $6.77{\times}10^{20}cm^{-3}$ , 홀 이동도는 $22cm^2/Vs$ 를 나타내었다. 또한 이 조건에서 가장 큰 c-축 배향성을 얻을 수 있었고, 그 때의 반가폭은 $0.34^{\circ}$ 이…
Cell surface peptide display systems are large and diverse libraries of peptides (7-15 amino acids) which are presented by a display scaffold hosted by a phage (virus), bacteria, or yeast cell. This allows the selfsustaining peptide libraries to be rapidly screened for high affinity binders to a given target of intere…
Within materials science, the optical properties of carbon nanotubes refer specifically to photoluminescence, and Raman spectroscopy of carbon nanotubes. Spectroscopic methods offer the possibility of quick and non-destructive characterization of relatively large amounts of carbon nanotubes. There is a strong demand f…
By using a combined experimental and theoretical approach, we have gained new insights into multivalent binding. We have elucidated a novel 'sacrifice and screening’ effect in which flexible multivalent arrays optimise their interactions with DNA, and dissected the thermodynamic parameters leading us to conclude that…
Small interfering RNAs (siRNAs) have attracted considerable attention as compelling therapeutics providing safe and competent delivery systems are available. Dendrimers are emerging as appealing siRNA delivery vectors thanks to their unique well‐defined architecture and the resulting cooperativity and multivalency con…
Abstract : Testing of the Navy's Combined Contaminated Fuel Detector with alternative sourced fuels was conducted as a part of the ongoing effort to certify the use of renewable fuels in all Navy aircraft and ships. Current certification efforts are focused on F-76 produced from the direct sugar to hydrocarbon (DSH) p…
The combination of natural and synthetic biomaterials leads to the formation of advanced Drug Delivery nano Systems (aDDnSs). The aDDnSs can be classified as hybridic (hy‐) or chimeric (chi‐) based on the nature – same or different respectively ‐ of biomaterials used. Such advanced bio complexes can alter the pharmaco…
La presente Tesis Doctoral esta dedicada a la sintesis, la caracterizacion y el estudio de la actividad catalitica en la combustion de carbonilla generada por motores diesel de oxidos CeO₂-ZrO₂, y CeO₂-PrO₂. Con este estudio se ha conseguido alcanzar una mayor comprension del papel catalitico de estos materiales en la…
This report presents a summary of the work performed by LG Fuel Cell Systems Inc. during the project LG Solid Oxide Fuel Cell (SOFC) Model Development (DOE Award Number: DE-FE0000773) which commenced on October 1, 2009 and was completed on March 31, 2013. The aim of this project is for LG Fuel Cell Systems Inc. (forme…
Using a novel bi-axial confocal rheoscope, we investigate the structure and rheology of sheared colloidal suspensions under confinement. Consistent with previous work [X. Cheng \textit{et al., Proc. Natl. Acad. Sci. U. S. A.}, 2011, 109, 63], we observe a vorticity-aligned string phase in moderate concentrated colloid…
A rail is an important and the most heavily laden element in the railway superstructure, because it \nfunctions as both the running surface used for vehicle guidance and the beam directly transmitting the \nload of the vehicles to the ballast bed and the railway substructure. The first part of the thesis describes \nt…
A study of exchange bias systems has been made focusing on the characteristics of the interfacial spin clusters found in-between the bilayers. The materials studied were primarily IrMn (10nm) / CoFe (2nm) thin films of varying grain sizes. They were selected as the bulk properties have already been well characterised…