Abstract Scaffold‐guided formation of neuronal‐like networks, especially under electrical stimulation, can be an appealing avenue toward functional restoration injured nervous systems. Here, 3D conductive scaffolds are fabricated based on printed microfiber constructs using near‐field electrostatic printing (NFEP) and graphene oxide (GO) coating. Various patterns obtained from poly( l ‐lactic acid‐ co ‐caprolactone) (PLCL) NFEP complexity is achieved via modulating the fiber overlay angles...

N-CF3 compounds constitute valuable targets in medicinal chemistry. Extensive studies have been reported for the preparation of through fluorination and trifluoromethylation N-containing compounds. The development new synthetic methods from abundant easily available substrates is highly desirable but still challenging. Herein, we report design synthesis novel N-Cbz- N-Boc-N-trifluoromethyl hydroxylamine reagents by silver-mediated oxidative trifluoromethylation. These successfully applied to...

Inhomogeneous elliptical inclusions with partial differential equations have aroused appreciable concern in many disciplines. In this paper, a pseudo-spectral collocation method, based on Fourier basis functions, is proposed for the numerical solutions of two- (2D) and three-dimensional (3D) inhomogeneous elliptic boundary value problems. We describe how one can improve accuracy by making some extra “reconstruction techniques” before applying traditional series approximation. After...

Tracheal stenosis is one of major challenging issues in clinical medicine because the poor intrinsic ability tracheal cartilage for repair. Tissue engineering provides an alternative method treatment defects by generating replacement structures. In this study, we fabricated coaxial electrospun fibers using poly(L-lactic acid-co-caprolactone) and collagen solution as shell fluid kartogenin core fluid. Scanning electron microscope transmission images demonstrated that nanofibers had uniform...

A versatile synthesis of ArCF2X and [18F]Ar-CF3 type compounds from readily available ArCF2SO2CF3 has been developed. Diverse nucleophiles, including weak nucleophiles such as halides (18F–, Cl–, Br–, I–), RSH, ROH, could react with efficiently to give the corresponding difluoromethylene products. The control experiments Hammett plot indicated that reaction might proceed through a difluorocarbocation intermediate generated steric hindrance-assisted cleavage trifluoromethylsulfonyl group.

Abstract Polytetrafluoroethylene (PTFE)/aramid fabric composites are currently widely used as self-lubricating bearing liners. In this study, a PTFE composite coating was performed to improve the friction stability of PTFE/aramid in long-term friction. Effects surface modification on tribological properties were studied using ball-on-disk tests. Results showed that under different sliding condition, coefficient modified and unmodified similar after 240 min. However, curves increased first,...

A scaled boundary node method (SBNM) is developed for two-dimensional fracture analysis of piezoelectric material, which allows the stress and electric displacement intensity factors to be calculated directly accurately. As a boundary-type meshless method, SBNM employs moving Kriging (MK) interpolation technique an approximate unknown field in circumferential direction therefore only set scattered nodes are required discretize boundary. shape functions satisfy Kronecker delta property, no...

Due to pollution in the process of chemical treatments, wool textile industry has been remarkably changed use eco-friendly reagents preparatory and finishing operations. We previously isolated a wool-degrading bacterial strain (Pseudomonas sp.3096-4) from decomposed fabrics, which produces new type keratinase capable degrading cuticle layers. In this study, using fluorescein isothiocyanate (FITC) labelling scanning electron microscope, we found that Pseudomonas-derived efficiently removed...

This article is based on the structural linear fatigue frequency domain analysis method of power spectral density function, taking a single launch vehicle equipment as object. Based actual flight telemetry high-frequency random acceleration vibration data at installation position equipment, non-stationary segmented and processed to obtain total life damage key parts throughout flight. principle equivalence, envelope spectrum for whole has been optimized reduced, acceptance level conditions...

The interpolating element-free Galerkin scaled boundary method (IEFG-SBM) is a semi-analytical which only requires to discretize the by (EFG) without fundamental solution. This ideally suited solve problems containing infinite domain and singular physical fields. study develops novel that couples IEFG-SBM finite element (FEM) for crack analysis in order take full advantages of both FEM. adopted model close tip FEM rest domain. corresponding displacement interpolation models are employed each...

Purpose The purpose of this study is to determine the tribological behavior and wear mechanism a polytetrafluoroethylene (PTFE)/polyester (PET) fabric composite for application as self-lubricating liner suitable high-speed low-load friction conditions. Design/methodology/approach effects different loads sliding speeds on coefficients characteristics were studied using reciprocating tests. Scanning electron microscopy, extended depth-of-field energy-dispersive X-ray spectrometry was used...

This paper considers the application of method fundamental solutions (MFS) for numerical electroelastic analysis two-dimensional (2D) piezoelectric materials. Accurate simulating such problem requires solving coupled mechanical and electrical partial differential equations. In MFS, displacements potential are approximated by linear combinations equations, which expressed in terms source points located outside real computational domain. The final coefficients calculated enforcing satisfaction...

Wool fiber is a valuable natural material in the textile industry, but keratin cuticles on its surface can deteriorate product quality. fabric finishing has long-standing problem meeting goal of environmental sustainability. In this study, we developed an eco-friendly simple method wool treatment based direct incubation with whole culture Stenotrophomonas maltophilia DHHJ, keratinase-producing bacterial strain. This processing effectively reduced roughness for and samples by removing cuticle...

Transportation is one of main areas carbon emission in China. In order to forecast the time achieving peak, this paper firstly used STIRPAT model build relationship among and key influencing factors. Then by using data from Fujian province, it analyzed degrees on emission. Based this, development these factors, calculated transportation future. The research results could provide a way analyze into several certain factors its exactly.

Abstract In this paper, the Delayed Detached‐Eddy Simulation (DDES) model is used to simulate cloud cavitation process and flow field distribution characteristics in three‐dimensional cavitating chamber with a sudden change channel. The effect of evolution on investigated by vacuole volume fraction physical quantities field. And Q criterion introduced identify vortex structure its variation. results show that presents periodic characteristics, but period, distribution, structure, intensity...