4,218 publications from this institution
Integration of electromagnetic generators (EMGs) and triboelectric nanogenerators (TENGs) can increase the total energy conversion efficiency from one mechanical motion by connecting the two devices in parallel after using power management circuits. A critical issue is how to realize the integration of the EMG and TENG in the same current circuits. Here, a hybridized nanogenerator, including an EMG and a TENG with the same set of electrodes, has been utilized to simultaneously scavenge mechanical energy. The hybridized nanogenerator can deliver a high output current of about 3.8 mA and a high output voltage of about 245 V when the switch in the device circuit was turned on and off, respectively. A acceleration sensor can be achieved by using the hybridized nanogenerator, where the detection sensitivities are about 143.2 V/(m/s(2)) for TENG and 291.7 μA/(m/s(2)) for EMG. The fabricated hybridized nanogenerator may have practical use for scavenging mechanical energy and self-powered acceleration sensor systems.
A novel single‐crystalline microtubular structure of Al‐rich mullite has been synthesized via a simple solid–vapor process. The microtubes have perfect rectangularly framed cross‐sections (see Figure and cover) as defined by the ± (110) and ± (1 $\bar 1$ 0) facets. The microtubes have a [001] growth axis, a dislocation‐free volume, a large, completely hollow interior channel 0.5–3 μm in width, and thin walls of 50–100 nm.
This paper presents a test data compression scheme that can be used to further improve compressions achieved by linear-feedback shift register (LFSR) reseeding. The proposed compression technique can be implemented with very low hardware overhead. The test data to be stored in the automatic test equipment (ATE) memory are much smaller than that for previously published schemes, and the number of test patterns that need to be generated is smaller than other weighted random pattern testing schemes. The proposed technique can be extended to generate test patterns that achieve high n-detection fault coverage. This technique compresses a regular 1-detection test cube set instead of an n-detection test cube set, which is typically n times larger. Hence, the volume of compressed test data for n-detection test is comparable to that for 1-detection test. Experimental results on a large industry design show that over 1600X compression is achievable by the proposed scheme with the test sequence length, which is comparable to that of highly compacted deterministic patterns. Experimental results on n -detection test show that test patterns generated by the proposed decompressor can achieve very high 5-detection stuck-at fault coverage and high compression for large benchmark circuits.
Traditional chemical processes often generate substantial waste, leading to significant pollution of water, air, and soil. Developing eco-friendly chemical methods is crucial for economic and environmental sustainability. Mechano-driven chemistry, with its potential for material recyclability and minimal byproducts, is well-aligned with green chemistry principles. Despite its origins over 2000 years ago and nearly 200 years of scientific investigation, mechano-driven chemistry has not been widely implemented in practice. This is likely due to a lack of comprehensive understanding and the complex physical effects of mechanical forces, which challenge reaction efficiency and scalability. This review summarizes the historical development of mechano-driven chemistry and discusses its progress across various physical mechanisms, including mechanochemistry, tribochemistry, piezochemistry, and contact electrification (CE) chemistry. CE-induced chemical reactions, involving ion transfer, electron transfer, and radical generation, are detailed, emphasizing the dominant role of radicals initiated by electron transfer and the influence of ion transfer through electrical double layer (EDL) formation. Advancing efficient, eco-friendly, and controllable green chemical technologies can reduce reliance on traditional energy sources (such as electricity and heat) and toxic chemical reagents, fostering innovation in material synthesis, catalytic technologies, and establishing a new paradigm for broader chemical applications.
Piezotronics and piezo-phototronics effect: the piezopotential in piezoelectric semiconductor materials can effectively tunes/control the carrier separations and transport, which can improve the photovoltaic devices performances, especially for flexible and printed organic/inorganic piezoelectric semiconductor solar cell.
