In modern storage ring light sources, intra-beam scattering (IBS) is often thought of as a fundamental limitation to achieving ultra-low emittance and hence higher brightness. Beijing Advanced Photon Source (BAPS) is under designing dedicated to good coherence and high brightness at 5GeV, low emittance is required to reach the design request. Due to the low emittance, intrabeam scattering effect will be very strong. Accurately calculating to check if the design goal can be reached is necessary. In this paper we present the results of particle simulation study of intra-beam scattering effect on a temporary design lattice of BAPS
The structural stability and the elastic properties of a novel structure of lead titanate, which is named pre- perovskite PbTiO3 (PP-PTO) and is constructed with TiO6 octahedral columns arranged in a one-dimensional manner, are investigated by using first-principles calculations. PP-PTO is energetically unstable compared with conventional perovskite phases, however it is mechanically stable. The equilibrium transition pressures for changing from pre- perovskite to cubic and tetragonal phases are −0.5 GPa and −1.4 GPa, respectively, with first-order characteristics. Further, the differences in elastic properties between pre-perovskite and conventional perovskite phases are discussed for the covalent bonding network, which shows a highly anisotropic character in PP-PTO. This study provides a crucial insight into the structural stabilities of PP-PTO and conventional perovskite.
Enantiomerically pure (R)-1-aminoindan was firstly prepared by dynamic kinetic resolution. A novel racemization catalyst Pd/layered double-hydroxide-dodecyl sulfate anion (PD/LDH-DS) was prepared and used in the racemization of (S)-1-aminoindan, and the reaction condition was investigated. It was found that the catalyst had superior racemization ability. On this basis, combined with reaction condition of lipase Novozym 435, it was confirmed that toluene was the reaction solvent, 4-chlorophenyl valerate was the acyl donor, concentration of substrate was 82.5 mmol/L, reaction temperature was 55 ℃, and the reaction time was 15 h. Under the condition, (R)-1-aminoindan valerate was prepared with excellent ee P value (>99%) and high conversion (>99%).
A new nano-sized inorganic/organic (IO) hybrid material was synthesized by self-assembly of OSB-12 into layered aluminum silicate via a coprecipitation method. The process of the fabrication of hybrid material consisted of the following steps. Firstly, aluminum nitrate and OSB-12 were homogeneous mixed in the water. Thereafter, sodium silicate was slowly added in. Elemental analysis indicated that the combination ratio of aluminum silicate and OSB-12 was 2.2∶1. The hybrid was characterized by Zeta potential, Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscope (TEM) and surface area and porosity analyzer. The results showed that OSB-12 was inserted into the aluminum silicate layer in hydbrid material with lamellar and porous structure. Based on the amphiphilic characteristic of OSB-12, the resulted hybrid could be used as a sorbent to cationic and anionic dyes simultaneously. Meanwhile, the micron fiber contained hybrid and polyacrylonitrile (PAN) was also prepared by electrospinning, which can provide a convenient recycle of sorbent from water. Various factors affecting the adsorption were investigated. Under the optimum conditions, the maximum adsorption capacity was 471 mg/g of cationic (weak acid pink red B) and 847 mg/g of anionic dyes (victoria blue BO) respectively. The adsorptions process obeyed the Langmuir isothermal model and Frendlich isothermal model, because of the electric charge attraction playing a key role between ionic dye and OSB-12 embedding in the hybrid sorbent. The changes of Zeta potential of dye solution confirmed the point. In addition, the reused of the waste fiber was also been considered, the fiber was roasted in high temperature (600 ℃) to obtain a porous kaolin material which had tremendous adsorption capacity to heavy metal, the adsorption capacity was more than 8.3 mg/g of Cr 3+ . It can be predicted that the hybrid had a tremendous application potential in dye wastewater treatment from dye removal efficiency and material separation properties.
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