Machine Learning-Enabled Optical Architecture Design of Perovskite Solar Cells.

Perovskite solar cells, emerging as a cutting-edge solar energy technology, have demonstrated a power conversion efficiency (PCE) of >26%, which is below the theoretical limit of 33%. This study, employing a combination of neural network models and high-throughput simulation calculations, taking the single-junction FAPbI3 cell as an illustrative example, indicates that a pyramid structure, in comparison of a planar one, can increase the highest Jsc to 27.4 mA/cm2 and the PCE to 28.4%. Both Jsc and PCE surpass the currently reported experimental results. The optimized periodicity and tilt angle of the pyramid structure align with the textured structure of crystalline silicon solar cells. These results underscore the substantial development potential of neural network inverse design based on high-throughput calculations in the field of optoelectronic devices and provide theoretical guidance for the design of monolithic perovskite-silicon tandem solar cells.

[Expression of neuropeptides ghrelin and Nesfatin-1 in kainic acid kindling rats].

OBJECTIVE: To observed the post-seizure expression level of neuropeptides ghrelin and Nesfatin-1 between the untreated and treated groups in kainic acid-kindling rats and understand the significance of their basic expressions. METHODS: The male S-D rats were divided randomly into NS and VPA groups after seizure. Each group was divided into 7 subgroups of 3 h, 6 h, 12 h, 24 h, 3 d, 7 d and 14 d. And the blank group (without NS or VPA) and sham group (normal saline instead of kainic acid) were established. RIA (radioimmunoassay), ELISA (enzyme-linked immunosorbent assay) and immunohistochemistry were used to detect the expression levels of ghrelin and Nesfatin-1 in the serum and hypothalamus of kainic acid-kindling rats. RESULTS: Compared with the blank and sham groups, the seizure rats had a decreased expression of ghrelin while there was an elevated expression of Nesfatin-1 in hypothalamus. This trend was consistent with the serum expressions of deacylated ghrelin and Nesfatin-1. The expression of ghrelin became elevated at all stages in the VPA group. Especially the subgroups of 24 h (0.320 ± 0.007) and 7 d (0.284 ± 0.004) had a significant increase (P < 0.05) while their expression levels remained lowed than that of the blank group (0.342 ± 0.039). The expressions of Nesfatin-1 had a significant decrease (P < 0.05) in all VPA subgroups while they were higher than those in the blank group (0.124 ± 0.007). CONCLUSION: An accurate detection of serum expression level of deacylated ghrelin and Nesfatin-1 may reflect the fluctuation trend of neuropeptides in hypothalamus. It may offer a simple, sensitive and noninvasive method of diagnosing and treating epilepsy.

[Microsurgical anatomy and surgical approach of the ambient cistern].

OBJECTIVE: to describe detailed anatomy and compare four surgical approach of the ambient cistern, to assist in the process of conceptualizing a reliable surgical approach to allow for a successful course of surgery. METHODS: The microsurgical anatomy of the ambient cistern and four surgical approach was studied in 12 formalin-fixed brain specimens (24 hemispheres). Four simply formalin-fixed, the cerebral arteries of eight brain specimens were perfused with colored silicone, and they were dissected with the aid of an operating microscope. Special attention was paid to the anatomic structures limiting visualization in each approach. RESULTS: The ambient cistern extends from the posterior margin of the crural cistern to the lateral edge of the midbrain colliculi, and round the lateral surface of the upper portion of the brainstem; The ambient cistern mainly contained P(2) segment of the posterior cerebral artery, superior cerebellar artery, anterior choroidal artery, basal vein and trochlear nerve. The subtemporal approach allow for excellent exposure of the lower half of the ambient cistern, the vein of Labbé and the parahippocampal gyrus obstacle to exposure through this approach; The transtemporal transchoroidal approaches exposed the upper half of the ambient cistern of non-dominance hemisphere, its major drawback is the need to perform a corticectomy in the temporal lobe. In addition, the vein of Labbé extended far enough anteriorly to limit the cortical incision in the temporal lobe. The transinsular transchoroidal exposed the anterior upper half of the ambient cistern. Its major disadvantage is damage the temporal stem, the longer the inferior limiting sulcus, the shorter the incision, the better for preservation the temporal stems; The occipital transtentorial approaches exposed the posterior lower half of the ambient cistern, the parahippocampal gyrus also blocked to exposure through this approach. CONCLUSION: Surgical approaches to lesions of the ambient cistern must be tailored to the site of the pathological findings. Position of the vein of Labbé, and the midpoint of the rounded medial edge of the parahippocampal gyrus, is key to determine Surgical Approach.