Passive particles driven by self-propelled particle:The wake effect

This work focuses on numerically studying hydrodynamic interaction between a passive particle and a self-propelled particle,termed a squirmer,by using a two-dimensional lattice Boltzmann method(LBM).It is found that the squirmer can capture a passive particle and propel it simultaneously,provided the passive particle is situated within the squirmer's wake.Our research shows that the critical capture distance,which determines whether the particle is captured,primarily depends on the intensity of the squirmer's dipolarity.The stronger dipolarity of squirmer results in an increased critical capture distance.Conversely,the Reynolds number is found to have minimal influence on this interaction.Interestingly,the passive particle,when driven by the squirmer's wake,contributes to a reduction in the squirmer's drag.This results in a mutual acceleration for both particles.Our findings can provide valuable perspectives for formulating the principles of reducing the drag of micro-swimmers and help to achieve the goal of using micro-swimmers to transport goods without physical tethers.

The influence of diabetes enhanced inflammation on cell apoptosis and periodontitis

Aim: Diabetes mellitus is a metabolic disorder leading to hyperglycemia and exhibiting altered fat and protein metabolism. Diabetes altered cellular microenvironment caused myriad untoward effects. Periodontitis is chronic inflammatory disease. Diabetes and periodontitis had higher prevalence in populations. The objective studied the relationship between diabetes and periodontitis associated with cell apoptosis and the influence of diabetes enhanced inflammation on apoptosis and periodontitis. Methods: This paper studied and analyzed the papers which published in the worldwide associated with the influence of diabetes enhanced inflammation on cell apoptosis and periodontitis, and reviewed the probably mechanism associated with apoptosis. Results: Diabetes induced hyperglycemia enhanced inflammation related to cell apoptosis. Periodontitis had a higher morbidity on diabetes patients. Periodontal intervention may be benefit to controlling the diabetes. The bidirectional efficiency happened between diabetes and periodontitis. Anti-apoptotic and anti-inflammation option can improve the therapeutic effects on diabetes and periodontitis. The finding included following several aspects. 1) Advanced glycation end products enhanced inflammatory response;2) Hyperglycemia induced cell apoptosis;3) inflammatory cytokines caused cell apoptosis;4) Mutuality between cell apoptosis and periodontitis;5) Diabetes induce periodontitis and bone loss;6) Periodontitis induced insulin resistance. 7) TNFα induce prostaglandins elicited cell apoptosis;8) periodontal therapies had effects on diabetes. Conclusion: Diabetes can enhance inflamemation leading to apoptosis and periodontitis. Effective periodontal therapy and control glucose may produce better effects on diabetes or periodontitis. Further research required to investigate the bidirectional mechanism between diabetes and periodontitis.

Calibration and data restoration of light field modulated imaging spectrometer

A light field modulated imaging spectrometer （LFMIS） can acquire the spatial-spectral datacube of targets of interest or a scene in a single shot. The spectral information of a point target is imaged on the pixels covered by a microlens. The pixels receive spectral information from different spectral filters to the diffraction and misalignments of the optical components. In this paper, we present a linear spectral multiplexing model of the acquired target spectrum. A calibration method is proposed for calibrating the center wavelengths and bandwidths of channels of an LFMIS system based on the liner-variable filter （LVF） and for determining the spectral multiplexing matrix. In order to improve the accuracy of the restored spectral data, we introduce a reconstruction algorithm based on the total least square （TLS） approach. Simulation and experimental results confirm the performance of the spectrum reconstruction algorithm and validate the feasibility of the proposed calibrating scheme.