Abstract Quartz veins in high‐pressure to ultrahigh‐pressure metamorphic rocks witness channelized fluid flow that transports both mass and heat during collisional orogenesis. This can occur the direction of changing temperature/pressure subduction or exhumation. SHRIMP U‐Pb dating zircon from a kyanite‐quartz vein within eclogite Dabie continental collision orogen yields two age groups at 212 ± 7 181 13 Ma, which are similar LA‐ICPMS 210 4 180 5 Ma for same sample. These ages significantly...

Abstract Fluid availability during high‐grade metamorphism is a critical factor in dictating petrological, geochemical and isotopic reequilibration between metamorphic minerals, with fluid‐absent commonly resulting neither zircon growth/recrystallization for U‐Pb dating nor Sm‐Nd resetting isochron dating. While peak ultra‐high pressure (UHP) characterized by fluid immobility, high‐pressure (HP) eclogite‐facies recrystallization exhumation expected to take place the presence of fluid. A...

Thermoelastic damping (TED) has been confirmed as an intrinsic energy loss and determines the upper limit of quality factor micro/nanoelectromechanical system (M/NEMS) resonators. A framework for determining TED in full clamped (C-C-C-C), clamped-free-clamped-free (C-F-C-F), cantilever (C-F-F-F) rectangular microplate resonators operating fundamental mode by considering three-dimensional heat conduction conjunction with modified couple stress theory (MCST) is proposed this article. Then...

The piston is one of the parts that most easily become worn out and experience failure in mud pumps for well drilling. By imitating body surface morphology dung beetle, this paper proposed a new type (BW-160) pump had dimpled shape regular layout on leather cup carried performance test self-built rig. Firstly, influence different dimple diameters service life was analyzed. Secondly, analysis central included angle under same area density obtained. Thirdly, wear time experimental results...

Abstract Intra-oceanic arcs are one of the major building blocks continents, and rarely exposed calc-alkaline plutons in intra-oceanic a critical component arc crust. These provide juvenile crustal materials to continental crust, thus their petrogenesis has important implications for formation evolution Here, we present results an integrated study, involving field investigation, petrology, geochronology geochemistry, on intermediate–felsic mafic magmatic enclaves (MMEs) within Proto-Tethyan...

To improve the friction and wear performance of piston-cylinder liner pair, inspired by earthworms leeches, 27 kinds pistons with cylindrical pit arrays are designed processed. Through a test, four superior textured optimized, wear, life thermal imaging tests performed. Finite element analysis pair model is performed, mechanisms discussed. The results show that have excellent performance, less heat generation friction, longer lives scratches on cylinder liner. temperature optimized was...

This article reports the design and experiment of a novel air-assisted nozzle for pesticide application in orchard. A was designed based on transverse jet atomization pattern. conducted performance deposition experiments established mathematical model volume median diameter (D 50 ) liquid flow rate with parameters. The D this ranged from 52.45 μm to 113.67 μm, 142.6 ml/min 1,607.8 within conditions. These performances meet low-volume ultra-low-volume droplet results demonstrated that...

Chronological and geochemical studies of adakites adakitic rocks are important in understanding the tectonic evolution geodynamic processes. We present new zircon U–Pb ages, Hf isotope, analyses exposed Baishan area, southeastern Jilin Province, China. These together with existing age data, indicate that magmatism Province can be subdivided into four stages: Early–Middle Triassic (251–235 Ma), Late (221–219 late Early–early Jurassic (176–156 Early Cretaceous (ca. 130 Ma). occur a nearly...

Bionic strips were designed and processed on the piston of BW-160 slime pump to improve its friction performance, decrease wear mass losses, prolong service life. Nine stripped pistons manifested by different strip depths included angles between stripes surface. A workbench was created test frictional force, oil film width, losses. Test results demonstrated that structure can significantly force piston. Optimal depth, angle, resistance reduction rates for reached 2 mm, 90°, 53.89%,...

During the present study, a double groove texture was designed on surface of piston ring to improve sealing performance between and cylinder liner. The experimental design method used fabricate test plan according width, depth, spacing. By using thermal–structural coupling analysis method, finite element standard textured carried out simulate deformation state liner system group during working stroke. rings with different parameters by scheme were manufactured wire electrical discharge...

A new kind of pit-shaped bionic plunger proposes to reduce the frictional resistance reciprocating and improve its sealing performance. According dorsal pore earthworm, pit structure with different parameters designed processed. The friction test, observation finite element analysis carried out. results show that can lubrication condition surface a maximum drag reduction rate 14.32%. increase storage lubricating oil, intercept streamline, decrease flow rate. plungers’ mean contact pressure...

To reduce the friction, wear, and temperature of piston-cylinder liner friction pair, we designed processed 27 kinds bio-inspired textured pistons with cylindrical pits. Based on experimental optimization design method, test, wear thermal imaging test were carried out. Results show that can significantly friction. Various texture parameters have different effects mean force. The is less than standard piston. influence piston are analyzed through range analysis, regression equation, 3D...

The prediction of upcoming circular walking during linear is important for the usability and safety interaction between a lower limb assistive device wearer. This study aims to build bilateral elimination rule-based finite class Bayesian inference system (BER-FC-BesIS) with ability predict transition using inertial measurement units.

This study presents a comprehensive three-dimensional finite element modeling and parametric analysis of composite beam-to-column joints in steel–timber structures. The investigation encompassed variety shear connector configurations, end plate designs, bolt dimensions, aiming to elucidate their respective influences on the structural performance behavior these joints. Through meticulous numerical simulation, this research sought enhance understanding interactions load transfer mechanisms...

Photovoltaic, electric vehicle charging pile and other new energy access has put forward higher requirements for the safe reliable operation of distribution grid. As terminal equipment power system protection, low voltage circuit breaker is biased to user side. Its frequent opening closing will bring contact damage, performance deterioration problems. Therefore, it very important assess its condition. The 80A molded case (MCCB) taken as research object. Build experimental platform sample...

The mud pump piston is a key part for providing circulation, but its sealing performance often fails under complex working conditions, which shorten service life. Inspired by the ring segment structure of earthworms, bionic striped on surfaces (BW-160) was designed and machined, performances standard were tested testing bench. It found efficiently enhanced piston, while stripe depth angle between stripes lateral both significantly affected performance. with 2 mm 90° showed best performance,...