Hengdian Group DMEGC Magnetics (China)

Today, as the most well-developed photovoltaic (PV) technology, silicon-based solar cells still dominate the PV market. In order to further maximize the power output of the PV modules, it is vital to cut the full solar cells into half-size cells. An increase of 3% in overall power output can often be seen for the half-cell PV modules. However, the solar cell splitting process, which is usually conducted by laser cutting, inevitably causes structural damage and power conversion efficiency loss to the cut cells. The overall performance of the cut solar cell is greatly dependent on the laser cutting scenario. How the laser cutting parameters, such as cutting technique and cutting direction influence the performance of the solar cell is still under debate. In this work, commercial efficient N-type TOPCon solar cells were subjected to laser scribe and mechanical cleaving and thermal laser separation from different cutting side, respectively, to comprehensively investigate the effect of laser cutting procedures on the overall performance of the cells.

Soft magnetic composites (SMCs) have found extensive application in electrical energy conversion. Enhancing the high-frequency operational efficiency and reducing the core loss of the materials are critical for improving energy conversion efficiency and minimizing energy consumption. Here, we develop a methodology to enhance the effective permeability and its frequency stability under high-frequency operation and reduce core loss, through optimized particle size distribution and improved insulation layer morphology. A Ni–Zn ferrite-phosphate coating approach is proposed. Results indicate that optimizing the particle size distribution of FeNi45 to 53–75 μm leads to a 44.3% increase in effective permeability (f = 50 kHz) and an 82.0% reduction in core loss (f = 50 kHz, Bm = 50 mT). As the serrated grain morphology and crack of the Ni–Zn ferrite layer proved insufficient for insulation, phosphoric acid with good wettability was subsequently applied over the ferrite layer, forming a continuous, complete, and dense Ni–Zn ferrite-phosphate composite insulation layer. Scanning electron microscopy analysis revealed that the phosphate effectively fills the gap and crack within the ferrite, blocking eddy current paths. With a 1 wt % phosphoric acid addition, yielding a core loss of 146.71 mW/cm3, particularly the eddy current loss decreased significantly from 386.21 mW/cm3 to 26.47 mW/cm3 (f = 50 kHz, Bm = 50 mT). Concurrently, exhibited an effective permeability of 82.85 (f = 50 kHz) and a DC bias performance of 53% (f = 50 kHz, HDC = 7.96 × 103 A/m (1 Oe ≈ 79.6 A/m)). These findings provide insights and practical methodologies for optimizing coating strategies in SMCs, which is beneficial for enhancing their high-frequency working efficiency in electronic applications and reducing energy consumption.

Rare cases of swallowed fish bones leading to cholecystitis and gastric perforation have been reported. Here, we present the case of a 71-year-old male patient who experienced 10 days of right upper quadrant pain after eating fish. Laparoscopic repair of gastric perforation and cholecystectomy was performed and successfully removed a fishbone of 3 cm in length from the region between the gallbladder cavity and the gastric antrum. The patient was 10 days after surgery and recovered well. No sign of recurrence was observed at the 3-month follow-up.

ABSTRACTDifferent content of organic montmorillonite was added into Nylon 66/glass fiber composites to improve the wear resistance of the composites. It found that the wear loss and wear rate of the nylon 66/glass fiber composites with 0.5 wt% organic montmorillonite were only 8.83 mg and 0.52%, reduced by 25.4% and 29.3% compared with the nylon 66/glass fiber composite without organic montmorillonite. Moreover, the friction curves of nylon 66/glass fiber/organic montmorillonite composites with a small coefficient of friction entered the stable friction stage quickly. Especially, the glass fiber in nylon 66/glass fiber/organic montmorillonite composites was arranged more regularly and was worn less as shown in the images of SEM. The wear resistance mechanisms of the nylon 66/glass fiber/organic montmorillonite composites were regarded as that organic montmorillonite with self‐lubricating effect oriented in the nylon 66/glass fiber composites and enhanced the crystallinity of the nylon 66 matrix. Moreover, organic montmorillonite aggregated on the surface of glass fiber due to the hydrogen bonds between organic montmorillonite and glass fiber, resulting in the orientation of glass fiber, the increase of the flowability of the composites, and the decrease of the “floating fiber” problems. Thus, this work revealed that when there were glass fiber and organic montmorillonite in nylon 66, the interaction between glass fiber and organic montmorillonite had an obvious effect on the wear resistance of the composites.

In the field of nanotechnology, achieving precise manipulation of ellipsoidal nanoparticles presents a significant challenge because it requires controlling five degrees of freedom, including three spatial dimensions (position in 3D space) and two angular dimensions (polar and azimuthal angles). In this work, we investigate both the optical forces and trapping potentials on an ellipsoidal nanoparticle produced by tightly focused fractional vector beams (FVBs). Unlike the integer vector beams (IVBs), which manipulate only three spatial dimensions of ellipsoidal particles, FVB with an initial phase not only provides spatial position control but also enables precise manipulation of spatial orientation. Moreover, by adjusting the topological index and initial phase of the incident FVBs, arbitrary orientations in the 3D space of ellipsoidal nanoparticles can be achieved. Our results may find interesting applications in microfluidics, biomedical engineering, and nanotechnology.