There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.

/pdf/electronics-and-optoelectronics-of-two-dimensional-2jbqr1unvw.pdf

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

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

: The unpolarized absorption and circular dichroism spectra of the fundamental vibrational transitions of the chiral molecule, 4-methyl-2-oxetanone, are calculated ab initio. Harmonic force fields are obtained using Density Functional Theory (DFT), MP2, and SCF methodologies and a 5S4P2D/3S2P (TZ2P) basis set. DFT calculations use the Local Spin Density Approximation (LSDA), BLYP, and Becke3LYP (B3LYP) density functionals. Mid-IR spectra predicted using LSDA, BLYP, and B3LYP force fields are of significantly different quality, the B3LYP force field yielding spectra in clearly superior, and overall excellent, agreement with experiment. The MP2 force field yields spectra in slightly worse agreement with experiment than the B3LYP force field. The SCF force field yields spectra in poor agreement with experiment.The basis set dependence of B3LYP force fields is also explored: the 6-31G* and TZ2P basis sets give very similar results while the 3-21G basis set yields spectra in substantially worse agreements with experiment. jg

Ab initio calculation of vibrational absorption and circular dichroism spectra using density functional force fields

介绍了Kirk—Othmer Encyclopedia of Chemical Technology（化工技术百科全书）（第五版）电子图书网络版数据库，并对该数据库使用方法和检索途径作出了说明，且结合实例简单地介绍了该数据库的检索方法。

Kirk-Othmer Encyclopedia of Chemical Technology数据库介绍及实例

Over recent years there has been an increasing interest in refractory uranium minerals as a potential source of uranium to keep up with the growing demand for nuclear fuel. One mineral of particular interest is the pyrochlore betafite: [(Ca,U)2(Ti,Nb,Ta)2O7], found in numerous deposits across the world. The dissolution of betafite is influenced by a number of variables such as leach parameters (total iron concentration, acid concentration, and temperature), fluoride ion from the dissolution of gangue minerals associated with the ore; and the composition and stoichiometry of the betafite itself. The complexity of betafite compositions and stoichiometry are particularly influential on the leaching of the mineral. In the current study dissolution experiments were conducted on synthetic betafite. A systematic investigation was completed in a pure matrix; to provide fundamental understanding of the betafite structure and its stability on uranium extraction from the mineral. The betafite synthesis was carried out using a solid state synthesis method at 1,100 degreeC under an inert atmosphere for 48 h. Dissolution studies were completed over a seven day period at varying acid concentrations, total iron concentrations, and presence of foreign ions (fluoride). The results showed > 65% of the total dissolution occurred within the initial 15 min of all experiments. After this period, the dissolution rate decreased significantly and remained at this slow rate for the duration of each experiment. Extensive characterisation was conducted using XRD and SEM-EDX; in order to investigate the chemical and structural changes in the betafite pre- and post-leaching.

Dissolution and post leach characterisation of synthetic betafite - a uranium pyrochlore mineral

Intracranial hemorrhage--a cause of perinatal mortality.

The electrodeposition of metals from room temperature ionic liquids (RTIL) has received significant attention due to their unique properties which have been shown to control the surface morphology and quality of the metal film. In this work we report on the electrodeposition of silver from commercially available ILs such as ([BMIm][BF4]) and N-methyl-N-butyl-pyrrolidinium-bis-(trifluoromethanesulfonyl)imide ([C4mpyr][TFSI]) using readily available silver salts such as silver tetrafluoroborate (AgBF4) and silver triflate (AgOTf). The electrodeposition mechanism is determined from chronoamperometry experiments and the surface morphology is investigated with scanning electron microscopy.

Electrodeposition of Silver from the Room Temperature Ionic Liquids 1-Butyl-3-Methylimidazolium Tetrafluoroborate and n-Methyl-n-Butyl-Pyrrolidinium-Bis-(Trifluoromethanesulfonyl)Imide

6E-4 Body mass index from birth to adulthood and metabolic risk factors for cardiovascular disease; data from the New Delhi Birth Cohort

Micro x-ray diffraction, a technique that enables imaging and mapping of the phase distribution in complex minerals, was used to explore the mineralogy of bauxite samples and to obtain x-ray diffraction patterns of trace level minerals. Micro x-ray diffraction can be used to obtain information on unusual and or trace level samples that cannot be studied by conventional powder x-ray diffraction methods and or solid samples that are not in powder form. High quality x-ray diffraction patterns of trace level samples of gibbsite, boehmite and hematite. Micro x-ray diffraction mapping and line scan of bauxite samples and leach residue (whole rock and polished) revealed details of the mineralogy and grain location of the minerals in bauxite.

Mineral Characterization Using Micro X-ray Diffraction (Micro XRD), a State-of-the-art Non-destructive Technique

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