다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Structural information on nanometer-sized gold particles has been limited, due in part to the problem of preparing homogeneous material. Here we report the crystallization and x-ray structure determination of a p-mercaptobenzoic acid (p-MBA)-protected gold nanoparticle, which comprises 102 gold atoms and 44 p-MBAs. The central gold atoms are packed in a Marks decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. The p-MBAs interact not only with the gold but also with one another, forming a rigid surface layer. The particles are chiral, with the two enantiomers alternating in the crystal lattice. The discrete nature of the particle may be explained by the closing of a 58-electron shell.

http://science.sciencemag.org/content/sci/318/5849/430.full.pdf

Structure of a thiol monolayer-protected gold nanoparticle at 1.1 A resolution

This review offers an introduction to the principles and generic applications of FT-ICR mass spectrometry, directed to readers with no prior experience with the technique. We are able to explain the fundamental FT-ICR phenomena from a simplified theoretical treatment of ion behavior in idealized magnetic and electric fields. The effects of trapping voltage, trap size and shape, and other nonidealities are manifested mainly as perturbations that preserve the idealized ion behavior modified by appropriate numerical correction factors. Topics include: effect of ion mass, charge, magnetic field, and trapping voltage on ion cyclotron frequency; excitation and detection of ICR signals; mass calibration; mass resolving power and mass accuracy; upper mass limit(s); dynamic range; detection limit, strategies for mass and energy selection for MSn; ion axialization, cooling, and remeasurement; and means for guiding externally formed ions into the ion trap. The relation of FT-ICR MS to other types of Fourier transform spectroscopy and to the Paul (quadrupole) ion trap is described. The article concludes with selected applications, an appendix listing accurate fundamental constants needed for ultrahigh-precision analysis, and an annotated list of selected reviews and primary source publications that describe in further detail various FT-ICR MS techniques and applications. © 1998 John Wiley & Sons, Inc., Mass Spec Rev 17, 1–35, 1998

Fourier transform ion cyclotron resonance mass spectrometry: A primer

저작근 근전도에 관한 정상교합자와 ii급 부정교합자의 비교 연구

A radial dipolar excitation has been applied to a hyperbolic Paul trap with a segmented ring electrode. In addition, this
configuration allowed the generation of an elliptical Paul trap by superimposing the RF trapping field with an electrostatic
azimuthally quadrupolar field. The changes in the radial ion motions with respect to the conventional Paul trap are discussed and
investigated experimentally. As expected, the formerly degenerated radial eigenfrequencies $\nu_{r}$
 of the standard Paul trap split
into two separate resonances at $\nu_{x}$
 and $\nu_{y}$
 , while the axial eigenfrequency $\nu_{z}$
 remains unaffected. The new trap
design adds flexibility and extends the range of applications of Paul traps.

A split-ring Paul trap for dipolar excitation of the radial ion motion and ellipticity studies

https://iopscience.iop.org/article/10.1088/1361-6455/aa9801/pdf

Disentangling the photodissociation pathways of small lead clusters by time-resolved monitoring of their delayed decays: the case of {{{\rm{P}}{\rm{b}}}_{31}}^{+}

Comparison of the low-energy decay mechanisms of C70+ and C70−

The SHIPTRAP Penning trap mass spectrometer has been designed and constructed to measure the mass of short‐lived, radioactive nuclei. The radioactive nuclei are produced in fusion‐evaporation reactions and separated in flight with the velocity filter SHIP at GSI in Darmstadt. They are captured in a gas cell and transfered to a double Penning trap mass spectrometer. There, the cyclotron frequencies of the radioactive ions are determined and yield mass values with uncertainties ⩾4.5⋅10−8. More than 50 nuclei have been investigated so far with the present overall efficiency of about 0.5 to 2%.

Precise mass measurements of exotic nuclei—the SHIPTRAP Penning trap mass spectrometer

Similar to fingerprints, atoms can be identified by their masses—when weighted with sufficient accuracy. The mass of an atom reflects all internal forces and thus carries information on the strong,...

Lutz Schweikhard

Papers

A split-ring Paul trap for dipolar excitation of the radial ion motion and ellipticity studies

Disentangling the photodissociation pathways of small lead clusters by time-resolved monitoring of their delayed decays: the case of {{{\rm{P}}{\rm{b}}}_{31}}^{+}

Comparison of the low-energy decay mechanisms of C70+ and C70−

Precise mass measurements of exotic nuclei—the SHIPTRAP Penning trap mass spectrometer

Masses of short-lived nuclides: precision measurement techniques and applications.