Analysis of Intelligent Equipment Usage for Work-Related Musculoskeletal Disorders Prevention in Miners—Shanxi Province,China,2023

Summary What is already known about this topic?Work-related musculoskeletal disorders(WMSDs)are prevalent in the workforce and occur across various industries.Surveys show that the prevalence of WMSDs among miners is generally over 50%.What is added by this report?High levels of intelligent equipment usage(IEU)can decrease the prevalence of WMSDs among miners by 7.49%and reduce pain by 13.69%on average.

Growth of Large-Area Single- and Bi-Layer Graphene by Controlled Carbon Precipitation on Polycrystalline Ni Surfaces

We report graphene films composed mostly of one or two layers of graphene grown by controlled carbon precipitation on the surface of polycrystalline Ni thin films during atmospheric chemical vapor deposition(CVD).Controlling both the methane concentration during CVD and the substrate cooling rate during graphene growth can signifi cantly improve the thickness uniformity.As a result,one-or two-layer graphene regions occupy up to 87%of the fi lm area.Single layer coverage accounts for 5%11%of the overall fi lm.These regions expand across multiple grain boundaries of the underlying polycrystalline Ni fi lm.The number density of sites with multilayer graphene/graphite(>2 layers)is reduced as the cooling rate decreases.These fi lms can also be transferred to other substrates and their sizes are only limited by the sizes of the Ni fi lm and the CVD chamber.Here,we demonstrate the formation of fi lms as large as 1 in^(2).These fi ndings represent an important step towards the fabrication of large-scale high-quality graphene samples.

Laser Machined Fiber‑Based Microprobe: Application in Microscale Electroporation

Microscale electroporation devices are mostly restricted to in vitro experiments(i.e.,microchannel and microcapillary).Novel fiber-based microprobes enable in vivo microscale electroporation and arbitrarily select the cell groups of interest to electroporate.We developed a flexible,fiber-based microscale electroporation device through a thermal drawing process and femtosecond laser micromachining techniques.The fiber consists of four copper electrodes(80μm),one microfluidic channel(30μm),and has an overall diameter of 400μm.The dimensions of the exposed electrodes and channel were customizable through a delicate femtosecond laser setup.The feasibility of the fiber probe was validated through numerical simulations and in vitro experiments.Successful reversible and irreversible microscale electroporation was observed in a 3D collagen scaffold(seeded with U251 human glioma cells)using fluorescent staining.The ablation regions were estimated by performing the covariance error ellipse method and compared with the numerical simulations.The computational and experimental results of the working fiber-based microprobe suggest the feasibility of in vivo microscale electroporation in space-sensitive areas,such as the deep brain.