Authors:Xiong Bing, Yang Weifan, Yuan Shuanggui, Ma Taotao, He Jianjun, Xu Yanbing, and Li Zongwei
A new heavy neutron-rich thorium isotope was produced via a multinucleon transfer reaction by irradiation of natural uranium
targets with 60 MeV/u18O ions. The Th activities was radiochemically separated from the uranium and mixture of reaction products by the rapid solvent
extraction method. Measurements of the gamma-ray spectra were performed with HPGe detectors. The new neutron-rich isotope238Th was identified for the first time based on the observation of the growth and decay of the gamma-ray with energy of 1060.5
keV from the decay of238Pa. The half-life of238Th has been determined to be 9.4±2.0 minutes. Further, a gamma-ray of 89.0 keV with the 8.9-minute half-life was found, which
may be due to the decay of the new isotope238Th.
A series of Ag–Pd/C catalysts with different Ag/Pd molar ratios were prepared by impregnation and characterized by N2 adsorption and XPS. The catalytic performance was investigated in the hydrodechlorination of carbon tetrachloride into chloroform.
High selectivity toward chloroform, near 100%, was obtained over Ag–Pd/C bi-metal catalysts. A very pronounced surface enrichment
with Ag in Ag–Pd/C catalysts determined by XPS may be responsible for the high selectivity of chloroform. It is suggested
that hydrodechlorination of carbon tetrachloride into chloroform occurs on the surface of Ag in the Ag–Pd alloy and the role
of Pd is to supply H atoms necessary.
Authors:Jianjun Li, Xuguang Wang, Rongzu Hu, Bin Kang, Yuxiang Ou, and Boren Chen
The determination of the most probable mechanism function and the calculation of kinetic parameters of thermal decomposition
of powder emulsion explosives have been achieved by different kinetic equations and different kinetic methods from data non-isothermal
SC-DSC curves, DSC curves, and thermal explosion delay curve. The courses which the reaction would follow under adiabatic
conditions are predicted.
The aim of this study was to investigate the mechanisms of Internet gaming disorder (IGD) and the associated interaction effects of childhood trauma, depression and anxiety in college students.
Participants were enrolled full-time as freshmen at a University in the Hunan province, China. All participants reported their socio-demographic characteristics and undertook a standardized assessment on childhood trauma, anxiety, depression and IGD. The effect of childhood trauma on university students' internet gaming behaviour mediated by anxiety and depression was analysed using structural equation modelling (SEM) using R 3.6.1.
In total, 922 freshmen participated in the study, with an approximately even male-to-female ratio. A mediation model with anxiety and depression as the mediators between childhood trauma and internet gaming behaviour allowing anxiety and depression to be correlated was tested using SEM. The SEM analysis revealed that a standardised total effect of childhood trauma on Internet gaming was 0.18, (Z = 5.60, 95% CI [0.02, 0.05], P < 0.001), with the direct effects of childhood trauma on Internet gaming being 0.11 (Z = 3.41, 95% CI [0.01, 0.03], P = 0.001), and the indirect effects being 0.02 (Z = 2.32, 95% CI [0.00, 0.01], P = 0.020) in the pathway of childhood trauma-depression-internet gaming; and 0.05 (Z = 3.67, 95% CI [0.00, 0.02], P < 0.001) in the pathway of childhood trauma-anxiety-Internet gaming. In addition, the two mediators anxiety and depression were significantly correlated (r = 0.50, Z = 13.54, 95% CI [3.50, 5.05], P < 0.001).
The study revealed that childhood trauma had a significant impact on adolescents' Internet gaming behaviours among college students. Anxiety and depression both significantly mediated the relationship between childhood trauma and internet gaming and augmented its negative influence. Discussion of the need to understand the subtypes of childhood traumatic experience in relationship to addictive behaviours is included.