Search

[Objective] The Loess Plateau is a great geographical unit of China, which has important strategic significance for national food security and ecological security. Through long-term slope management, comprehensive watershed management, afforestation and other measures, the ecological environment of the Loess Plateau has been significantly improved, but it still faces challenges in such aspects as insufficient rationality of vegetation restoration in local areas, uncoordinated overall planning of the whole basin, and balanced economic development and ecological protection. Under the guidance of the national dual-carbon goal, the future direction and goal of the Loess Plateau ecosystem and agricultural sustainable development should be to support the realization of carbon neutrality, establish an environmentally suitable vegetation community, promote the development of the ecosystem as a whole, and realize the green transformation of the development mode. [Methods] Based on the bibliometrics tool CiteSpace, this paper visually analyzes the relevant literatures on the principle and application of soil regulation in the Loess Plateau published from 1992 to 2023, focusing on the core research strength, research hotspot and research trend in this research field. [Results] (1) From the perspective of the evolution of the number of published papers, the overall trend is rising, and the growth rate is explosive after 2001; (2) From the perspective of publishing institutions, Northwest A&F University has the highest number of publishing institutions in this field, with 2 157; (3) From the perspective of the cooperative relationship between authors, Academician SHAO Mingan and Professor LIU Guobin are the core leaders in this field, and the number of published papers is 141 and 117 respectively. The cooperative network formed by them has been very mature; (4) From the perspective of research hotspots and development trends in this field, the main research hotspots focus on soil moisture, yield, dryland, soil erosion, soil nutrients and vegetation restoration, etc. The future micro theme trend will focus on yield, slope position and nitrogen application amount, while the future macro trend will explore a new model of the coupling and coordinated development of eco-economic-social system. [Conclusion] Based on the results of visual analysis, three perspectives on the principles and application of soil regulation in the Loess Plateau were proposed, including cooperative research, research hotspots and future key development directions.

In practical engineering, noise and impact hazards are pervasive, indicating the pressing demand for materials that can absorb both sound and stress wave energy simultaneously. However, the rational design of such multifunctional materials remains a challenge. Herein, inspired by cuttlebone, we present bioinspired architected metamaterials with unprecedented sound-absorbing and mechanical properties engineered via a weakly-coupled design. The acoustic elements feature heterogeneous multilayered resonators, whereas the mechanical responses are based on asymmetric cambered cell walls. These metamaterials experimentally demonstrated an average absorption coefficient of 0.80 from 1.0 to 6.0 kHz, with 77% of the data points exceeding the desired 0.75 threshold, all with a compact 21 mm thickness. An absorptance-thickness map is devised for assessing the sound-absorption efficiency. The high-fidelity microstructure-based model reveals the air friction damping mechanism, with broadband behavior attributed to multimodal hybrid resonance. Empowered by the cambered design of cell walls, metamaterials shift catastrophic failure toward a progressive deformation mode characterized by stable stress plateaus and ultrahigh specific energy absorption of 50.7 J/g—a 558.4% increase over the straight-wall design. After the deformation mechanisms are elucidated, a comprehensive research framework for burgeoning acousto-mechanical metamaterials is proposed. Overall, our study broadens the horizon for multifunctional material design. Noise and impact hazards are pervasive in engineering, necessitating materials capable of absorbing both sound and stress wave energy. Here, we present bioinspired metamaterials with exceptional sound-absorbing and mechanical properties using a weakly-coupled design strategy. These materials incorporate multi-layered resonators for superior acoustic performance and cambered cell walls for enhanced structural strength. They achieve an average absorption coefficient of 0.80 across the 1.0 to 6.0 kHz range, all within a sleek 21 mm thickness. Furthermore, the design transitions failure modes from catastrophic to progressive, resulting in a remarkable 558.4% increase in energy absorption compared to conventional designs. [ABSTRACT FROM AUTHOR]