Dynamic Scaling of Ramified Clusters Formed on Liquid Surfaces

A comprehensive simulation model -- deposition, diffusion, rotation, reaction and aggregation model is presented to simulate the formation processes of ramified clusters on liquid surfaces, where clusters can disuse and rotate easily. The mobility （including diffusion and rotation） of clusters is related to its mass, which is given by Dm = Dos^-γD and θm = θos^-γθ, respectively. The influence of the reaction probability on the kinetics and structure formation is included in the simulation model. We concentrate on revealing dynamic scaling during ramified cluster formation. For this purpose, the time evolution of the cluster density and the weight-average cluster size as well as the cluster-size distribution scaling function at different time are determined for various conditions. The dependence of the cluster density on the deposition flux and time-dependence of fractal dimension are also investigated. The obtained results are helpful in understanding the formation of clusters or thin film growth on liquid surfaces.

Computer Simulation of Early Stage in Thin-Film Growth

Nucleation and growth process has been studied on atomic scale for the early stage of thin-film growth by means of computer simulation.The island number and its shape vary with a set of control conditions,such as deposition flux R,surface diffusion rate W and coverage.The kinetic parameters p and q obtained from simulation are positive and dependent on the growth process.The transition from the initial steps of nucleation to growth is also explored.The simulation results are consistent with the experiments and the rate equations from nucleation theory.

电解法降解凤眼莲的研究

采用电解装置制备环保型氧化电解水(EOW)用于凤眼莲的降解预处理。通过研究,得出EOW降解凤眼莲的最佳处理条件是氯化钠质量分数为0.60%,反应温度为75℃,时间为75 min。在这条件下预处理凤眼莲可获得最高还原糖含量(0.756±0.002)mg/mL,最高还原糖得率为35.56%,达到理论最高产量的85%。EOW具高效、绿色环保等优越属性,可解决目前凤眼莲利用率低和传统的酸、碱预处理法造成的严重环境污染等问题,辅助解决凤眼莲泛滥生长问题。

外置管路清洗系统对改善牙科综合治疗台水路消毒效果

目的分析外置一体式管路清洗系统对牙科综合治疗台水路消毒效果。方法2023年3月在牙体牙髓科和急诊综合科各自选取4台独立储水罐型牙科综合治疗台,并分别设置对照组和实验组。其中对照组使用25mg/L含氯消毒液进行管路消毒,实验组采用外置管路清洗机消毒,并分别在消毒前、消毒后即刻、消毒后第二天、第三天、第四天、第五天、第六天采集牙科治疗台储水罐、三用枪和牙科高速手机处的水样,进行细菌培养和检测;同时,分别记录对照组人工消毒操作和实验组管路清洗系统消毒的时间。结果消毒前两组水路细菌值差异无统计学意义;相较于对照组,实验组消毒后即刻水样的菌落值显著降低,并在连续三天循环消毒后的观察周期内,仍能保持有效的洁净效果(均值<100CFU/ml,P<0.05);对牙体牙髓科和急诊综合科科室间差异进行分析发现,外置管路清洗机对两科室牙科治疗台的储水罐消毒效果无明显差异,但实验组中牙体牙髓科在三用枪和牙科手机处的水样细菌值均低于急诊综合科(P<0.05);在人工及时间方面,实验组外置管路清洗系统单台消毒人工操作时间约为2min,而对照组常规流程人工操作时间约为20min。结论外置管路清洗机能显著改善牙科综合治疗台水路消毒效果,并在循环消毒后能使牙科治疗台水路在一定周期内维持有效的清洁状态,并与常规消毒程序相比,有效降低了临床牙科治疗台管路消毒的时间和人力成本。