Advanced Materials Research Vols. 287-290

Abstract: Flexible free standing polymer electrolyte films have been successfully prepared using a blend of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and poly(vinyl chloride) (PVC) doped with lithium perchlorate (LiClO₄). The conductivity of the film was influenced by salt concentration and the degree of crystallinity. An optimum room temperature conductivity obtained was 2.10 x 10^-4 S cm^-1 for PVDF-HFP/PVC containing 35 wt.% LiClO₄. The temperature-dependent conductivity of the polymer films exhibited VTF-type behaviour.

Abstract: The history and application of the FEA are briefly presented in this paper. Several key technologies such as the building of material model, the establishment of the chip - tool friction model as well as meshing are described. Taking the high-speed cutting of titanium alloy (Ti - 10V - 2Fe - 3Al) as an example , reasonable cutting tools and cutting parameters are determinted by simulating the influences of cutting speed, cutting depth and feeding rate on the cutting parameters using FEA.

Abstract: Multilayer materials produced by explosive welding of low carbon steel were investigated. Non-uniform structure of interlayer boundary was characterized using visible light microscopy, SEM and TEM. It was shown that 4 zones with different structure and mechanical properties present in the welded seams. To estimate fatigue properties of the multilayer materials kinetic diagram of fatigue failure were used. It was revealed that larger boundary waves give more significant contribution to fatigue crack resistance. In experiments carried out in the current research number of cycles to failure of multilayer materials was higher than those for bulk materials.

Abstract: Sertoli cells are an important part of the male reproductive system. Except the function of promoting spermatogenesis such as supporting, providing nutrition and secreting, it also can maintain the immune privilege of testis through the expression of a special surface molecule named FasL. This feature aviods the immune response triggered by self antigen (germ cells) contacting with the body, which can be used to provide immune privilege environment for transplanted cells in areas other than the testis. In this article, we purified mouse sertoli cells, through adding different concentrations of IGF-I and IGF-I receptor inhibitor PPP, we study the role of IGF-I in the proliferation of sertoli cells. The results demonstrated that 30ng/mL IGF-I can promote the proliferation of sertoli cells while 2nmol/L PPP obviously inhibited the proliferation of sertoli cells. This result has a certain significance to obtain the high activity sertoli cells and increase the success rate of xenotransplantation.

Abstract: To drink excessively for long time would damage human genital system seriously, nevertheless there is still less researches on the effect of ethanol to granule cells. Here we adhibit means of TUNEL coloration and flowcytometry examination and treat ex vivo granule cells with ethanol at different chroma and time. The result shows that ex vivo granule cells treated with ethanol at different chroma and time can be observed distinctly the morphologic character of cell apoptosis, and the percentage of apoptosis of ex vivo granule cells induced by ethanol would increase in a certain bound of chroma and time as the increasing of the chroma and time, indicating that ethanol can produce dysgenesia by inducing the apoptosis of granule cells of ovaries. The damage of ethanol for granule cells arouses people to control drinking and nip drinking evil in the bud, which is a world of practical importances for human’s procreate and health.

Abstract: The reaction process of synthesis of indole from aniline and ethylene glycol was studied by GC-MS. Based on experimental results, a new reaction process proposed. It was found to be quite complicated with involvement of a few of main phases: condensation, cyclization, elimination and so on, which provides a theoretical guild for the development of used catalysts. It could be presupposed that the yield of synthesis of indole was related to dehydrogenation activity of catalysts.

Abstract: Yule-Nielsen spectral neugebauer (YNSN) model is widely used in printing for predicting dot area. The model’s accuracy is effected by the paper’s performance, ink kinds, wavelengths, and printing conditions. In the paper, the relation between the solid color patch’s spectral reflectance and the printing’s dark dot area is discussed. By experiments, the solid color patch’s spectral reflectance is adopted as fixed index of YNSN model, which can reduce the deviation of the dark color patch. The research has a certain significance for controlling printing quality and reducing the producing cost.

Abstract: Millions of people worldwide have cavities in teeth, thus ranking cavity issue important in global oral health. This study created the temporary dental composite filling material with zinc oxide, eugenol solvent, and polylactic acid (PLA) fibers. Zinc oxide and eugenol (IRM^®) were blended with a weight ratio of 3:1, after which a variety of PLA fibers (2 wt%, 4 wt%, 6 wt%, 8 wt%, and 10 wt%) were then well mixed with the IRM^® solution, completing the IRM^®/PLA dental filling composite. The aim of this study was to determine the influence of different contents of PLA fiber on the prepared filling composite, by employing measurements of leakage property, compressive strength, solubility, leakage and setting timer. In particular, when the PLA fibers was 6 wt%, the IRM®/PLA dental filling composite did not have micro-leakage on Day 13.

Abstract: Gelatin is a heterogeneous mixture of single or multi-stranded polymers made of amino acids. Its film formability, air permeability, biocompatibility, and hemostatic activity render it appropriate for wound dressing. In this study, we used a syringe to drop gelatin solution into oligomeric proanthocyanidins solution to prepare the composite microspheres. Physical properties of the composite microsphere, such as swelling, stability in water, contact angle, and Fourier transform infrared spectroscopy were examined. We aimed at investigating its potential use in promoting wound healing along with wound dressings. The greatest swelling (1480 %) of the gelatin/OPC composite microsphere was achieved in 10 min. The composite microspheres dissolved 90% in the first 60 min during water stability test. Therefore, the developed composite microsphere has great hydrophilic and can be used in biomedical applications.

Abstract: The effects of foaming agent AC on anti-explosion performance and physical properties of castables for trough of blast furnace were investigated by using brown corundom, silicon carbide, Secar 71 cement and microsilica as the main starting materials. The results showed that the incorporation of foaming agent AC decreased the temperature and the maximum rate at which water escaped from the castables, and hence improved the anti-explosion properties of the castables. The reason was that foaming agent AC would decompose and release gases during heating and generate superfine open pores at lower temperature favoring the expulsion of water. With increasing the content of foaming agent AC, the apparent porosity increased while the bulk density and modulus of rupture as well as crushing strength decreased. The developed castables were successfully applied to factory experiment, indicating excellent anti-explosion performance.