We report on the synthesis of CdSe/ZnX (X=S, Se) core/shell quantum dots from the CdO precursor through a convenient, one-pot approach. The defocusing stage (i.e., Ostwald Ripening) can be finely controlled to prepare nearly monodispersive core/shell quantum dots. The resulting particles have been characterized by their corresponding optical properties, energy dispersive spectroscopy, X-ray pho...

Synchrotron powder X-ray diffraction data are used to determine the core electron deformation of diamond. Core shell contraction inherently linked to covalent bond formation is observed in close correspondence with theoretical predictions. Accordingly, a precise and physically sound reconstruction of the electron density in diamond necessitates the use of an extended multipolar model, which aba...

The cylindrical permanent magnet is the core part of the permanent-magnet seed-metering device, it can absorb single magnetic powder coated seed. The first, the magnetic induction intensity model of any point in the cylindrical permanent magnet external was established based on the equivalent current model of permanent magnet. The second, the mathematical formula was derived using the Biot-Sava...

Shell printing is an advantageous binder jetting technique that prints only a thin shell of the intended object to enclose loose powder in core. In this study, packing and core was investigated for first time. By examining density microstructure printed samples, found be different between addition, particle size layer thickness were affect differently. At 200 µm thickness, 10 20 powders, less d...

The superfluid transition of He-He mixture films adsorbed on alumina powder is studied, with a He superfluid coverage near one layer. With up to 1.3 layers of He added, the transition becomes strongly broadened, indicating a linear increase in the vortex core size for He coverages below one layer. Annealing of the sample mixture at 4.2 K is found to be critically important in ensuring a homogen...

Germania glass was prepared from high purity GeO2 powder. Refractive-index dispersion was used to calculate material dispersion and to provide a model for representing the dispersion of GeO2-SiO2 glasses. The wavelength of zero material dispersion is found to be in agreement with theoretical calculations. Modal propagation is modeled for a GeO2 core-silica clad fiber. Results support compositio...

Claudio Nasruzzi et al (2000) evaluated the influence of the formulation and operating conditions on pellet preparation by pan technique. To this end, a new pelletization process, typified by the application of powdered drug on sugar – based cores using the GS coating system was studied. Different procedure have been used to evaluate a series of important parameters such as initial core weight,...

In this work, we show a simple experimental procedure to obtain CdTe/CdS (diameterZ3–7 nm) core shell nanocrystals in colloidal suspension. The nanocrystals were characterized by transmission electronic microscopy and powder X-ray diffraction analysis. The optical properties were determined by electronic absorption, excitation and emission spectroscopies and are discussed in terms of chemical c...

[1] We have measured the compressibility of CsClstructured FeSi to 40 GPa by X-ray powder diffraction using synchrotron radiation. A third order Birch-Murnaghan equation of state fit to the experimental data yields V0 = 21.74 ± 0.02 Å, with a K0 of 184 ± 5 GPa and K 0 0 = 4.2 ± 0.3. The measured density and elastic properties of CsClFeSi are consistent with silicon being a major element in the ...