Charge Characteristics of Dielectric Particle Swarm Involving Comprehensive Electrostatic Information.

The triboelectrification effect caused by dynamic contact between particles is an issue for explosions caused by electrostatic discharging (ESD) in the triboelectric nanogenerators (TENGs) for powering the flexible and wearable sensors. The electrostatic strength of dielectric particles (surface charge density, surface potential, electric field, etc.) is essential to evaluate the level of ESD risk. Those differential electrostatic characteristics concerned with unhomogenized swarmed particles cannot be offered via in-current employed-joint COMSOL 6.1 simulation, in which the discrete charged dielectric particles are mistakenly regarded as continuous ones. In this paper, the hybrid discrete element method (EDEM tool) associated with programming in COMSOL Multiphysics 6.1 with MATLAB R2023a was employed to obtain the electrostatic information of the triboelectric dielectric particle swarm. We revealed that the high-accuracy strengths of electric potential and electric field inside particle warm are crucial to evaluating ESD risk. The calculated electrostatic characteristics differ from the grid method and continuous method in the surface potential and electric field. This EDEM-based simulation method is significant for microcosmic understanding and the assessment of the ESD risk in TENGs.

[Activation of random-donor platelet concentrates and platelet prepared from random-donor apheresis collections during storage].

The activation of random-donor platelet concentrates and platelets prepared from random-donor apheresis collections (plateletpheresis) during storage were studied. Percentage of CD62p staining and mean channel fluorescence (MCF) of CD41 of two kinds of platelets during storage on day 0, day 1, day 3 and day 5 were determined by flow cytometry. The results showed that percentages of CD62p staining and MCF of CD41 in plateletpheresis were (18.91 +/- 6.25)%, (19.48 +/- 8.27)%, (22.82 +/- 6.06)%, (56.71 +/- 11.79)% and (8.09 +/- 2.38)%, (8.13 +/- 2.45)%, (8.44 +/- 2.51)%, (19.87 +/- 6.13)%, while the results of platelet concentrates were (30.65 +/- 12.33)%, (31.46 +/- 11.86)%, (32.51 +/- 13.05)%, (63.55 +/- 13.27)% and (10.33 +/- 4.37)%, (11.09 +/- 6.61)%, (13.46 +/- 9.69)%, (24.41 +/- 10.15)%, respectively. The platelet count and pH value were also determined. The platelet number, pH value, percentage of CD62p staining and MCF of CD41 had no significant difference within 3 days of platelet storage. The platelet number and pH value decreased significantly (P < 0.001), while percentages of CD62p staining and MCF of CD41 increased significantly (P < 0.001) on day 5 of storage. It is concluded that the quality of plateletpheresis is better than platelet concentrate.