Zheng Wen

2 months ago | nature.com | Weijie Zheng |Xingyue Ma |Zhentao Pang |Hongying Chen |Chunyan Zheng |Jianyi Liu | +9 more

Polar skyrmions have demonstrated rich physics and exotic properties for developing novel functionalities. However, so far, skyrmion nanodomains exist only in a few material systems, such as ferroelectric/dielectric superlattices, free-standing PbTiO3/SrTiO3 epitaxial bilayers and ultrathin Pb(Zr,Ti)O3/SrTiO3/Pb(Zr,Ti)O3 sandwiches. These heterostructures are fabricated with elaborately designed boundary conditions to meet the delicate energy balance for stabilizing topological phases. This requirement limits the broad applications of skyrmions in electronic devices. Here we show widespread skyrmion nanodomains in ferroelectric–antiferroelectric solid solutions, composed of ferroelectric PbTiO3 and one antiferroelectric PbSnO3 (Pb(Ti1–xSnx)O3), PbHfO3 (Pb(Ti1–xHfx)O3) or PbZrO3 (Pb(Ti1–xZrx)O3). The skyrmionic textures are formed by engineering dipole–dipole and antiferrodistortive–dipole couplings in competition between ferroelectric and antiferroelectric polar orderings, allowing the stabilization of topological phases. A phase diagram is built for the three solid solution series, revealing the stabilization regions of skyrmion nanodomains. In addition, the non-trivial domains also exhibit improved switching character, reversible writing/erasure and long-term retention for the electrical manipulation of polar configurations. These findings open an avenue for the investigation and exploitation of polar skyrmions in ferroelectric-based materials, providing opportunities in topological electronics. Polar skyrmions are of interest for nanoelectronics due to their exotic properties. However, so far, these are metastable states requiring a delicate balance of boundary conditions to form in heterostructures. In ferroelectric and antiferroelectric solid solutions, skyrmionic textures are observed to form in both bulk and film.

Sep 19, 2024 | nature.com | Chunfang Wang |Md Mijanur Rahman |Abu Siddik |Zheng Wen |Farid Ahammad Sobhani

As global environmental challenges intensify, manufacturing firms face increasing pressure to innovate sustainably. Green innovation, characterized by the development of environmentally friendly products, processes, and technologies, has become essential for firms striving to remain competitive. This study aims to investigate the influence of key factors—green logistics, green finance, and green technology—on green innovation within manufacturing firms, while exploring the mediating role of green technology in these relationships. A multi-method approach was employed, combining partial least squares structural equation modeling, fuzzy-set qualitative comparative analysis, and necessity condition analysis. 447 responses were collected from manufacturing companies in Dhaka city, Bangladesh, using structured questionnaires. The analysis revealed that green logistics and green finance have a significant positive impact on green innovation, while the influence of the green work environment was found to be positive but statistically insignificant. Additionally, green technology was identified as a significant mediator in the relationships between green finance, green logistics, and green innovation. This study offers a comprehensive green innovation model while green technology is a mediator. Furthermore, this study advances the resource-based view theory by integrating green technology as a pivotal resource that enhances a firm's competitive advantage in sustainable markets. By adopting a multi-method approach, this research provides a rigorous examination of the research questions, offering a comprehensive understanding of the dynamic interactions between green finance, green logistics, and green technology in driving innovation. Thus, this research has thought provoking implications to prioritize investments in green finance, logistics, and technology, manufacturing firms can enhance their competitiveness, improve operational efficiency, and meet evolving environmental regulations and consumer preferences.

Apr 20, 2024 | bmjopen.bmj.com | Shuang Zhang |Yuchen Li |Zheng Wen |Mingxiao Tong

MethodsPatients or the public were not involved in the design, conduct, reporting or dissemination plans of our research. This cross-sectional study was conducted between October 2022 and December 2022 at Beijing Jishuitan Hospital and Beijing No. 6 Hospital. The participants were the new nurses who had been in the profession for less than 2 years. Beijing Jishuitan Hospital is an 1819-bed general tertiary hospital in Beijing harbouring a National Orthopedic Center. The hospital has 1744 nurses.