No abstract available

No abstract available

[en] The sulfurization of a thin silver layer is a technique which can be used for preparing self-supporting silver sulfide targets. A very simple method is described for obtaining self-supporting sulfur targets composed of silver sulfide, which are stable, of a fixed composition, using only a small amount of sulfur. The method can easily be used for preparing self-supporting silver sulfide targets with isotopically-enriched sulfur

[en] Diffusion phenomena are analysed in structurally disordered systems with a mixed ion-electron type of conductivity. Chemical diffusion and selfdiffusion coefficients are determined for silver telluride at different temperatures and nonstoichiometry degrees. It is shown that the chemical diffusion coefficient in Agsub(2-delta)Te decreases monotonously with the deviation from the stoichiometric composition without anomaly near the point of p-n transition. A satisfactory agreement between calculated and experimental values of the chemical diffusion coefficient is observed

[en] Objective: To explore the effects of different flushing and scanning processing on optical density (A) responding and set up the clinic quality assurance protocol based on silver halide emulsions radiographic films. Methods: Setting different flushing temperature and choosing different batch's film and developer and fixer or fixer in the same batch with different analyzing dose were performed to analyze the effect on A value; The effect of light uniform, the stabilize work time and the noise of different scanning resolution were discussed. Results: The A value at the same dose level would enhance as the temperature increased; the responding curve of dose and A value with different batches of films varied a lot; the responding curve of dose and A value with different batches of films and developer and fixer solution had marked variations; the responding of dose and A with the same batches would show some low. The heterogeneity of the scanner would achieve 0.03; the A value of the same dose would gradually steady while the time of scanning was more than 10 minutes: the affect of noise would increase as the dose and resolution ratio increased. Conclusions: The best processing temperature is 29-31 degree C. Different batches of film couldn't be confounded. A new calibration must be obtained when the film dosimetry to evaluate dose distribution is used. A 5 - 10 min warm up for stabilize work and the best setting resolution/depth lever are 72 dpi/16 bit for scanning films are determined. (authors)

[en] Short note

[en] The controllable self-assembly of nanosized building blocks into larger specific structures can provide an efficient method of synthesizing novel materials with excellent properties. The self-assembly of nanocrystals by assisted means is becoming an extremely active area of research, because it provides a method of producing large-scale advanced functional materials with potential applications in the areas of energy, electronics, optics, and biologics. In this study, we applied an efficient strategy, namely, the use of ‘pressure control’ to the assembly of silver sulfide (Ag₂S) nanospheres  with a diameter of approximately 33 nm into large-scale, uniform Ag₂S sub-microspheres with a size of about 0.33 μ m. More importantly, this strategy realizes the online control of the overall reaction system, including the pressure, reaction time, and temperature, and could also be used to easily fabricate other functional materials on an industrial scale. Moreover, the thermodynamics and kinetics parameters for the thermal decomposition of silver diethyldithiocarbamate (Ag(DDTC)) are also investigated to explore the formation mechanism of the Ag₂S nanosized building blocks which can be assembled into uniform sub-micron scale architecture. As a method of producing sub-micron Ag₂S particles by means of the pressure-controlled self-assembly of nanoparticles, we foresee this strategy being an efficient and universally applicable option for constructing other new building blocks and assembling novel and large functional micromaterials on an industrial scale. (paper)

No abstract available

[en] We show temporal and frequency information can be effectively encoded in memristive devices with inherent short-term dynamics. Ag/Ag_2S/Pd based memristive devices with low programming voltage (∼100 mV) were fabricated and tested. At weak programming conditions, the devices exhibit inherent decay due to spontaneous diffusion of the Ag atoms. When the devices were subjected to pulse train inputs emulating different spiking patterns, the switching probability distribution function diverges from the standard Poisson distribution and evolves according to the input pattern. The experimentally observed switching probability distributions and the associated cumulative probability functions can be well-explained using a model accounting for the short-term decay effects. Such devices offer an intriguing opportunity to directly encode neural signals for neural information storage and analysis

No abstract available