The First Results of Supersonic Molecular Beam Injection in the HL-2A Tokamak

HL-2A tokamak, the first tokamak with divertor in China, has been constructed and put into operation in 2002. The main parameters are R=1.65 m, a=0.4 m, BT=2.8 T, Ip = 0. 48 MA. The divertor of HL-2A is unique, because it is characterized with a large closed divertor chamber. The device has double divertor chamber, but now it is operating with lower single null configuration to study the physics of divertor for the next step design of a divertor. Supersonic molecular beam injection （SMBI） system with LN2 cooling trap was first installed and demonstrated on the HL-2A tokamak in 2004. The first results of SMBI into HL-2A plasma are to demonstrate the function of the HL-2A divertor and to observe the cold pulse propagation during multi-pulse SMBI on HL-2A Tokamak.     

Equilibrium of drops on inclined fibers

Why is it that drops do not slip down inclined thin fibers or spider silks? The possible explanation is based on the existence of fiber size, which causes a sustaining force that pins these drops. Following this explanation, the drop remains in equilibrium until a critical value of the sustaining force is reached. We suggest an alternative analyses, from the point of view of the inclined fiber at which the drop slips down is predicted. This result does not depend explicitly on silk surface roughness, but only on the drop size and surface tensions.     

The non-isothermal kinetics of zinc ferrite reduction with carbon monoxide

Journal of Thermal Analysis and Calorimetry - This study aims to reduce zinc ferrite using carbon monoxide in the temperature range of 25–1000 °C using temperature-programmed...     

Preparation and magnetic properties of Cu-ferrite nanorods and nanowires

An aqueous solution method has been developed for preparing Cu-ferrite nanorods (NRs) array and nanowires (NWs) on Cu substrate. The Cu-ferrite NRs exhibit a clear uniaxial anisotropy with the easy axis along rods. The decrease of the reduced remanence from 0.24 in the parallel magnetic field to almost zero in the perpendicular field shows a strong effect of the demagnetizing field perpendicular to the rod axis. The weaker uniaxial anisotropy makes NWs the lower saturation magnetization.     

Characterization and biological evaluation of paclitaxel-loaded poly(L-lactic acid) microparticles prepared by supercritical CO2

In this study, paclitaxel loaded poly( L-lactic acid) (PTX-PLLA) microparticles were prepared using solution enhanced dispersion by supercritical CO2(SEDS) technique. This supercritical antisolvent technique offers the advantage of negligible organic solvent residua in the drug loaded microparticles. Scanning electron microscopy (SEM) showed that microparticles exhibited rather spherical shape and small particle size with narrow particle size distribution. X-ray diffraction (XRD) and differential scanning calorimeter (DSC) indicated that PTX was amorphously dispersed in the PLLA matrix. The drug loading and encapsulation efficiency of PTX-PLLA microparticles were 14.33% and 62.68%, respectively. In vitro cytotoxicity evaluation of PTX-PLLA microparticles against nonsmall-cell lung cancer A549 and ovarian cancer SKOV3 cell lines indicated that PTX-PLLA had superior antiproliferation activity against the A549 and SKOV3 cell lines, compared with free PTX formulations. The cellular internalization of fluorescent microparticles was evidenced by fluorescence microscope and further confirmed by transmission electron microscopy (TEM). This was attributed to the efficient intracellular accumulation of PTX via cell phagocytosis and sustained release of PTX from PLLA matrix. The anticancer activity of PTX-PLLA was associated with PTX-induced cell apoptosis such as nuclear aberrations, condensation of chromatin and swelling damage in mitochondria. The cell apoptosis index detected by flow cytometry was higher in PTX-PLLA group than in free PTX. The PTX-PLLA formulation, which was obtained through micronization of PTX and encapsulation of micronized PTX into PLLA simultaneously in the SEDS process, significantly potentiated the anticancer activity of PTX.     

Phenomena of the Cold Pulse Propagation during Pulsed Molecular Beam Injection

As an advanced fuelling method on tokamak, molecular beam injection （MBI） has successfully been developed in HL-1M firstly and applied to HL-2A later. Many advantages such as peaked density profile and the energy confinement time increasing have been found in the MBI experiments. Some interesting phenomena have been observed in the previous MBI experiments. But up to now the mechanism of the MBI seems not very clear.     

胶原纤维吸附材料除去茶多酚中的咖啡因

以皮胶原纤维制备吸附材料，研究了这种吸附材料对茶多酚中各组分的吸附特性．结果表明，所制备的吸附材料能选择性地吸附EGCG、GCG和ECG，吸附率在90％以上；对C、EC和EGC的吸附率相对较低；对咖啡因的吸附率最小，只有11．24％．吸附后的产物经纯水淋洗和丙酮水溶液洗脱后，EGCG、GCG和ECG的总含量达到93.81％，回收率均在80%以上；而咖啡因的含量只有0．038％．进一步研究表明，皮胶原纤维吸附材料对茶多酚中不同组分的选择吸附能力与各组分的分子结构有关．     

Preparation, structure, and magnetic properties of mesoporous magnetite hollow spheres

Preparation of mesoporous Fe3O4 (magnetite) hollow spheres has been reported using hydrothermal synthesis and calcinations. The carboxyl-functionalized PS spheres were used as the templates coated by Fe3O4 particles and ethylene glycol (EG) as an organic structure directing agent. PS and EG were removed by calcinations method. The surface area after calcination at 500 degrees C is found to be 74 m(2) g(-1). The hollow spheres exhibited the weak ferromagnetism.     

Preparation and properties of Ni-doped ZnO rod arrays from aqueous solution

Ni-doped ZnO rod arrays were successfully prepared on glass substrate from the aqueous solution at a temperature of 80 °C. The densities, diameters, and lengths of the rods can easily be well controlled through the concentrations of dopants, and the dopant Ni ions were incorporated into the wurtzite-structure of ZnO crystal. Room temperature photoluminescence spectrum of rod arrays show a strong emission band at 410 nm, and the oxygen deficiencies in ZnO structures were significantly reduced with Ni doped in ZnO rod arrays. The field dependence of magnetization measured at room temperature exhibited the obvious ferromagnetic properties.     

Preparation and characterization of the biomineralized zinc oxide particles in spider silk peptides

In this work, hierarchical ZnO particles were prepared using a biomineralization strategy at room temperature in the presence of peptides acidified from spider silk proteins. A mechanism of the mineralization of the ZnO particles was that the affinity of original ZnO nanoparticles and zinc ions in the peptide chains played an important role in controlling the biocrystallizing formation of the pore ZnO particles. The intensity of their visible green luminescence was enhanced with increases of the mineralization time due to the porous surface defects. The hierarchical ZnO materials with biomolecules will facilitate their photoluminescence spectra applications as biosensors or optoelectronic nanodevices in the future, when covalently coupled with peptides or other biomolecules to achieve patterned growth over large areas of substrate.