Junhong Zhang

Nov 12, 2024 | mdpi.com | Junhong Zhang

1. IntroductionSteel pipe pipelines are an indispensable part of production and life, but internal corrosion, cracks, and welding defects endanger the safety of these pipelines. Ultrasonic guided waves (UGWs) have the advantages of long detection distances and cover the whole cross-sectional area of the pipeline body. They are widely used in pipeline defect detection and cracked pipeline location [1,2,3,4,5].

Apr 25, 2024 | mdpi.com | Junhong Zhang |Ning WANG |Jian Wang |Hui Wang

1. IntroductionWith the enhancement of diesel engines, the thermal and mechanical load of their cylinder bore has increased accordingly, and the deformation of the cylinder bore has also increased [1,2,3]. Studies [4,5] have shown that an increase in the degree of irregular cylinder-bore deformation would lead to an increase in friction loss between the piston and cylinder bore.

Mar 20, 2024 | besjournals.onlinelibrary.wiley.com | Wenqing Chen |Jianyu Wang |Junhong Zhang |Jia He

Figure S1. Schematic representation of sampling area. Figure S2. Link Test for Environmental filtering for disentangling the contributions of environmental filtering to the constructed network links. Figure S3. Response of soil biodiversity to afforestation and natural regeneration along a 50-year restoration chronosequence. Figure S4.

Jan 15, 2024 | mdpi.com | Minjie Liu |Yangyang Yu |Junhong Zhang |Dan Wang

1. IntroductionFlame-vortex-induced flame propagation acceleration [1,2]. Under suitable conditions, uncontrollable autoignition occurs on trapped and compressed end-gas, resulting in DDT. The perforated plate is usually set to reduce the impact of fuel inertia on the fuel vessel. There is a general perception that the flame propagation rate is enhanced when passing through perforated plates [3,4,5,6].