Abstract Silicon has been considered as one of the best alternatives to replace widely used graphite anodes for lithium‐ion batteries, owing its high theoretical capacity, proper working voltage, abundant availability, and environmental friendliness. Nevertheless, there are many obstacles that hamper practical applications silicon anode materials such huge volume change, low electrical ionic conductivity, unstable solid electrolyte interface (SEI), which lead pulverization severe attenuation...

With the concept of smart geogrid coming out, many scholars have built optical fiber into to form a kind material with self‐sensing function structural deformation. It can not only reinforce parts potential safety hazards, but also functions monitoring, intelligent prevention, and control engineering disasters, which is great significance for ensuring tunnel construction improving monitoring methods. Based on predecessors’ research tensile calibration experiment sensor method simulation...

To address the uncertainty of optimal vibratory frequency fov high-speed railway graded gravel (HRGG) and achieve high-precision prediction fov, following research was conducted. Firstly, commencing with compaction experiments hammering modal analysis method, resonance f0 HRGG fillers, varying in compactness K, initially determined. The correlation between revealed through conducted at different frequencies. This established based on physical–mechanical properties encompassing maximum dry...

Abstract A cellulose‐based, highly pyrrolic‐nitrogen‐doped carbon aerogel (PNCA) was successfully prepared by using a facile and ecofriendly in situ dissolution process; the resulting had honeycomb‐like three‐dimensional structure pyrrole‐nitrogen‐doped configuration. As host material of cathode lithium‐sulfur batteries, PNCA achieved high sulfur loading up to 76.7 %, owing distribution pyrrole nitrogen network structure. consequence, this composite exhibits outstanding electrochemical...

Abstract Benefitting from its outstanding advantages, silicon (Si) has been considered as one of the best candidates anode materials for next‐generation lithium ion batteries (LIBs). Among various influencing factors on electrochemical performance Si anodes, binder attracts more and attention though occupying only a small portion. Well‐designed binders play critical role in improving cycling anodes. Herein, sodium carboxymethyl cellulose (CMC), poly (acrylic acid) (PAA), alginate (SA),...

Freeze‐thaw cycle is a type of fatigue loading, and rock stress relaxation under freeze‐thaw cycles takes into account the influence damage deterioration. Rock one paramount issues in tunnel slope stability research. To accurately describe mechanical behaviour rocks freeze‐thaw, software element constructed based on theory fractional calculus to replace ideal viscous traditional model. The degradation viscosity coefficient considered. A new three‐element model established better reflect...

The mechanical indices used to describe the anisotropy of layered rock mass are numerous and difficult be measured. Take medium - thick horizontal limestone as an example, tests, engineering geological survey, field numerical back-analysis were done obtain transverse isotropic deformation parameters strength indices. Normal moduli elasticity could preliminarily confirmed by uniaxial compression RQD, empirical formula. Then vertical testing mass, plate bearing conducted determine other...

In hard cataclastic surrounding rock with high geostress, the monomer strength is and broken, tunnel excavation in it apt to cause large deformation, collapsing, breaking, causing initial support crack even intruding of deformation. The characteristics system under different parameters shapes are analyzed, reasonable section shape determined. results showed that (1) condition geostress rock, deformation large, horizontal convergence much larger than settlement arch, duration relatively...

Abstract The construction process of the tunnel ground deformation regularity surrounding rock, stability, control surface based on requirements, combined with characteristics shallow large-span. Used three-dimensional numerical simulation software, established a dynamic analysis program to simulate center cross-diagram method and double sidewall drift method. Based stratum deformation, supporting force plastic zone distribution, comparative engineering adaptability different methods from...

Binders have been proved to be an economical and effective approach for accelerating the industrial application of silicon based anodes. Herein, a 3D network binder (H-PAN-g-ECH) with multifunctional groups, is constructed by crosslinking polyacrylonitrile (PAN) hydrolysate (H-PAN) epichlorohydrin (ECH). Strong polar groups carboxylate (-COO-) amide (-CONH2) obtained from hydrolysis PAN as well original cyanide (-CN) enhance adhesive ability H-PAN-g-ECH not only active material but also...

This paper presents a 1.2-V low-jitter PLL which provides 3.125-GHz eight-phase clocks for the SerDes CDR with data rate of 12.5-Gb/s. The circuit incorporates ring VCO, precise CP and dynamic PFD. A fourth order VCO gain KVCO 1-GHz/V is designed in to generate clocks, while new delay cell without tail current source proposed. Moreover, PFD meet demand speed. based on mirror used change phase error detected by into signal. Realized 55-nm CMOS technology, can provide rail-to-rail clock,...

The failure mode of surrounding rock shallow buried multi-arch tunnel was an important content stability analysis tunnel. Through systematic theoretical study, three-dimensional geo-mechanics model test and field monitoring sample comprehensive means, based on the Hoek-Brown criterion, numerical analytical solution continuous arch established by plastic limit analysis, geo-mechanical under 3 kinds excavation methods studied. test, multi obtained, design theory improved.

Determining surrounding rock loose circle of plastic stability evaluation was critical parameters for the rational, economic support designed to provide an effective basis.In this paper, relying on field engineering, integrated embedded pressure monitoring and deformation resistivity measurement systems determine give scope, guided tunnel construction, it provided important parameter design.

A 12.5Gbps quarter rate SerDes CDR for high speed serial link communication is presented in this paper. The proposed dual loop structure consisting of frequency tracking and phase has good input jitter rejection. novel switching ppms lock detector to ensure proper loops prevent false locking. Moreover, a bang-bang designed achieve low power characteristic. With clock 625MHz the received NRZ data at 12.5Gbps, recovered 0.044UI. consumption 63.6mW@1.2V.

Hou, F.-J.; Li, S.-C.; W.-J.; X.-Z., and Han, X.-M.; 2019. Mechanical analysis of large-span tunnel construction in urban seaside. In: Gong, D.; Zhu, H., Liu, R. (eds.), Selected Topics Coastal Research: Engineering, Industry, Economy, Sustainable Development. Journal Research, Special Issue No. 94, pp. 255–259. Coconut Creek (Florida), ISSN 0749-0208.A seaside is designed as a two-way eight-lane with span nearly 20 meters. The stratum horizontal layered rock mass three-level surrounding...

Li X.-Z.; Zhu, Y.-Q., and Zhao, J., 2019. Seepage analysis optimization of engineering method for municipal underwater tunnel construction in urban coastal stratum. In: Gong, D.; H., Liu, R. (eds.), Selected Topics Coastal Research: Engineering, Industry, Economy, Sustainable Development. Journal Research, Special Issue No. 94, pp. 260–263. Coconut Creek (Florida), ISSN 0749-0208.A is a double-deck shared by traffic corridors. It an the Water seepage must be considered during process. By...

Aiming at the difficult problem of solving positive solution pose cable-driven parallel robot, a numerical algorithm for real-time redundant constrained mechanism is proposed. Firstly, motion model and mathematical eight-cable-driven robot are established, then cable length calculated by establishing kinematic inverse equation according to principle vector closure. The nonlinear forward system deduced through equation, using genetic algorithm. Assuming that trajectory central actuator...