In order to achieve high-precision pneumatic cylinder friction test, this paper proposes a new direct measurement method based on electric cylinder in which the axially acting forces from the compressed air in the two facing pneumatic cylinders cancel each other out and the detected value of the force transducer is just friction. For the sake of the implementation of the method, a new low-cost test method for identifying deadband of proportional directional valve was proposed, and a set of fuzzy PI constant pressure control system was designed to cope with a certain degree of leakage in the chamber. Based on the above, a friction test platform with two pneumatic cylinders facing each other was eventually built to study the influence of pressure, pressure difference, and piston speed on the friction of two commonly used different types of pneumatic cylinders. Through multiple sets of tests, it is found that when the lip seals are used in pairs between the piston and the inner wall of the cylinder, the friction between the piston and the cylinder is only related to the sum of the two chamber pressures, but not to the pressure difference between the two chambers; When the O-ring seal is used between the piston and the inner wall of the cylinder, the friction between the piston and the cylinder is related not only to the pressure of the two chambers, but also to the pressure difference between the two chambers. In addition, a series of comparative tests with the traditional single-cylinder friction test method directly demonstrate the effectiveness of the proposed new method.

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We extracted Camellia oleifera oil bodies (COOB) from Camellia oleifera seeds (COS) to evaluate the function of oil bodies in delivering lipophilic bioactive compounds. Curcumin was loaded into COOB by pH shift method to form Curcumin-Camellia oleifera oil body emulsion (COB). Characterization analysis of COB with different mass fractions showed that COB had the best encapsulation efficiency (80.56%), particle size (2.17 μm), and environmental stress, could show excellent stability at salt concentrations from 100 to 500 mmol/L or pH values of 3 and 5 to 9 and at different temperature treatments when the addition of curcumin was 1%. Based on the digestion of COB in the gastrointestinal tract, a stable and sustained release of the active substance and, ultimately, a bioavailability of 81.51% of curcumin and 37.33 μmol/ml of free fatty acids were obtained in COOB carriers, which indicated COOB has the potential as a natural delivery system for lipophilic bioactive compounds.

Objective Non-suicidal self-injury (NSSI) behaviors are prevalent in adolescents and have adverse effects on physical and mental health. However, little is known about the relationship between NSSI and alexithymia, or the underlying mechanisms that could explain this relationship. This study aimed to elucidate the current status of NSSI in adolescent depression, and analyze the relationship between alexithymia, loneliness, resilience, and adolescent depression with NSSI, so as to provide a theoretical basis for psychotherapeutic interventions. Method The study sample involved inpatients and outpatients from 12 hospitals across China and adolescents with depression who met the DSM-5 diagnostic criteria for depression episode. The following scales were used: The Functional Assessment of Self-Mutilation, Toronto Alexithymia Scale, UCLA Loneliness Scale, and Connor Davidson Resilience Scale. Results The detection rate of NSSI in adolescents with depression from 2021.01.01-2022.01.01 was 76.06% (1782/2343). Spearman's correlation analysis revealed a significant correlation between alexithymia, loneliness, resilience and NSSI in depressed adolescents, the results of the independent samples t-test showed that the differences between the two groups for each factor were statistically significant. Binary logistic regression results showed that alexithymia (B = 0.023, p = 0.003, OR = 1.023, 95% CI: 1.008–1.038) and depression (B = 0.045, p < 0.001, OR = 1.046, 95% CI: 1.026–1.066) are risk factors for NSSI, resilience (B = − 0.052, p < 0.001, OR = 0.949, 95% CI: 0.935 − 0.964) is a protective factor for NSSI. Alexithymia directly predicted NSSI and also indirectly influenced NSSI through the mediated effect of resilience. Loneliness moderates the first half of the path of this mediated model. Conclusion The data from this study provide evidence for the mediating effect of resilience between alexithymia and NSSI, as well as evidence that loneliness can moderate the first segment of the pathway in this moderated mediation model. We discuss perspectives for future research and interventions based on the findings of the study.