In this research, ultrathin MoSe2 nanosheets (MoSe2 NSs) with enriched selenium vacancy (Se-vacancy) were prepared by a HNO3-assisted exfoliation strategy. The features of synthesized catalysts were characterized by SEM, TEM,...

Using numerical simulation to study solar water heating system it will be fast to obtain data and have a reasonable conditional statistical forecast. In this paper, based on the numerical model of an actual forced circulation solar water heating system, the whole year thermodynamic performance in a forced circulation solar water heating system are simulated and studied. It is shown that the efficiency of energy utilization and the heat loss of collectors in the system are closely related with the out door temperature and main efforts should be on the collectors.

The heat transfer system of glass evacuated solar collector with an inserted heat pipe was established and researched experimentally. Two different kinds of heat collector device with heat pipe using magnetic nano-fluids and water as the working fluid respectively were researched at different aspects of tilt angles, climate conditions and total solar radiations.The exprimental results show that the solar collector with an inserted heat pipe using magnetic nano-fluids as the working medium has the lower heat loss coefficient, the higher average daily efficiency and instantaneous efficiency. The results provide a new idea to improve the heat transfer performance of solar collectors.

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Purpose: To observe the crystalline lens rise (CLR) in horizontal and vertical orientations using anterior segment optical coherence tomography (AS-OCT). Methods: Non-invasive swept-source AS-OCT was used to measure the lens thickness, CLR, and angle-to-angle distance (ATA) in both the horizontal and vertical orientations. Anterior chamber depth (ACD) and horizontal white-to-white corneal diameter were obtained using the Pentacam HR (Oculus Optikgeräte GmbH). Axial length was obtained using the IOLMaster 700 (Carl Zeiss Meditec AG). The paired t test was used to analyze the difference in CLR between the two orientations. Pearson correlation analysis was performed to investigate the correlations between CLR and other ocular variables. Results: This prospective observational study comprised 99 eyes (99 patients) that underwent Visian Implantable Collamer Lens (STAAR Surgical) implantation for myopic correction. The mean CLR was 64.29 ± 168.04 and 208.09 ± 173.12 µm in the horizontal and vertical orientations, respectively. The vertical CLR (VCLR) was significantly greater than the horizontal CLR (HCLR) ( P < .05). Both the HCLR and VCLR were positively correlated with lens thickness and negatively correlated with ACD (all P < .05). The difference in CLR (VCLR-HCLR) was positively correlated with the axial length and the difference in ATA between the two orientations ( P < .05). Conclusions: VCLR was greater than HCLR in most patients with myopia, especially in the longer eyes. This nonuniform distribution in CLR implied different placements of the iridocorneal angles in the horizontal and vertical orientations and should be considered for the selection of ICL size and placement position. [ J Refract Surg . 2023;39(5):354–359.]