Charge carriers are the basic physical element in an electrically driven quantum-dot light-emitting diode (QLED), which acts as a converter transforming electric energy to light energy. Therefore, it is widely sought after manage charge for achieving efficient conversion; however, date, there has been lack of understanding and strategies. Here, QLED achieved by manipulating distribution dynamics with n-type 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) layer embedded into...

Integrating optoelectronic devices with various functions into a monolithic chip is popular research frontier. The top-down integration scheme on silicon-based III-nitride wafers has unique advantages. A on-chip system lighting source, electrical absorption modulator, waveguide and photodetector the same structure were designed fabricated to discover asymmetry of photon emission in quantum well diode. characteristics characterized detail three different spectral redshifts observed...

Targeting the high-quality signal and transmission robustness of sensing communications in future intelligent vehicles, this paper proposes an ultra-wideband compact antenna which can work at left-hand circular polarization (LHCP) right-hand (RHCP). It consists two cross-arranged dipoles, four parasitic elements, a feeding network, ground plane. The radiation arm dipoles is shaped truncated elliptical form to broaden 3-dB axial ratio bandwidth. To stabilize pattern improve higher frequencies...

A method to improve charge and energy storage performance of PbZrO3 (PZO) thin films by α-Fe2O3 nanoparticles (NPs) doping is proposed. The PZO were deposited on Pt(111)/Ti/SiO2/Si substrates a chemical solution deposition method. effect NPs structure electrical properties has been investigated in detail. maximum polarization (Pmax) ∼78 μC/cm2 recoverable density as high ∼17.4 J/cm3 have achieved the doped at ∼600 kV/cm, which are increased 69.6% 65.7% compared un-doped films, respectively....

In this paper, we demonstrate the continuous-wave and acousto-optical Q-switched performance of diode-pumped slab Ho:(Sc0.5Y0.5)2SiO5 (Ho:SYSO) laser at 2.1 µm for first time. Two 1.91-µm diodes were used to pump Ho:SYSO crystal. With a wing-pumping structure, absorbed power 44.7 W, continuous wave produced 20.7 W maximum output 2097.9 nm, resulting in slope efficiency 53.1% with respect power. regime, up 3.4 mJ pulse energy 20 ns minimum width repetition frequency 5 kHz, corresponding peak 170 kW.

Isothermal vapor−liquid equilibrium (VLE) data for ethane (R170) + trifluoromethane (R23) system were measured at six temperatures from (188.31 to 243.76) K and pressures up 1.62 MPa. The measurements performed with a recirculation method. experimental correlated the Soave−Redlich−Kwong equation of state using Huron−Vidal mixing rule NRTL model. calculated results agree well data. Azeotropic VLE behaviors can be observed certain compositions

Isothermal vapor−liquid equilibrium (VLE) data for the binary mixture of methane (R50) + tetrafluoromethane (R14) were measured at (159.61, 161.58, 169.38, 173.90, and 178.93) K. The experiments carried out with a recirculation-method apparatus including measurements temperatures, pressures, compositions liquid vapor phases. experimental VLE correlated by Peng−Robinson equation Panagiotopoulos−Reid mixing rule its modified form. calculated results these two models compared data.

Capillary flow of water in an array open nanotextured microgrooves fabricated by femtosecond laser processing silicon is studied as a function temperature using high-speed video recording. In range 23-80 °C, the produced wicking material provides extremely fast liquid with maximum velocity 37 cm/s initial spreading stage prior to visco-inertial regime. The capillary performance enhances increasing inertial, visco-inertial, and partially Washburn regimes. classic universal Washburn's regime...

A dense spectral multiplexing structure based on the reflective volume Bragg gratings is introduced to realize diode laser with an ultra-narrow channel spacing of 1.5 nm. With combination polarization and coarse multiplexing, a source producing 2045 W power from output fiber core diameter 105 µm NA 0.2 achieved at injection current 10 A. The electro-optical optical-optical efficiency 42% 76%, respectively. Experimental results demonstrate ability VBG high brightness.

This paper presents an open-source untethered quadrupedal soft robot platform for dynamic locomotion (e.g., high-speed running and backflipping). The is mostly (80 vol.%) while driven by four geared servo motors. robot's body legs were 3D printed with gyroid infill using a flexible material, enabling it to conform the environment passively stabilize during in multi-terrain environments. In addition, we simulated real-time simulation. With tuned gaits simulation, real can locomote at speed of...

This Letter reports a collinear optical interconnect architecture for acoustic sensing via monolithic integrated GaN optoelectronic chip. The chip is designed with ring-shaped photodiode (PD) surrounding light-emitting diode (LED) of spectral range from 420-530 nm. axisymmetric structure helps the coaxial propagation light transmission and reception. By placing this multiple-quantum wells (MQW)-based device piece aluminum-coated polyethylene terephthalate (Al/PET) film on fiber ends, an...

Isothermal vapor−liquid equilibrium (VLE) data for {tetrafluoromethane (R14) + ethane (R170)} were measured at (179.68, 190.14, 200.68, and 210.03) K. A recirculation-method apparatus was used in this measurement, which a self-made electromagnetic recirculation pump to drive the vapor accelerate thermodynamic process. The VLE fitted with Peng−Robinson equation Huron−Vidal mixing rule. calculated results compared experimental data.

A wicking Nylon 6 polymer material was produced through surface structuring by a direct femtosecond laser nano/microstructuring approach. The structure is an array of parallel microgrooves, the which textured with irregular nanostructures and fine microstructures. High-speed imaging water spreading vertically uphill against gravity discloses series capillary flow regimes h ∝ t, t1/2, t1/3 scaling laws, where height rise t time. In initial stage, occurs single front, from at certain time...

Samples of the Ba9 (Lu2-x Yx )Si6 O24 :Ce3+ (x = 0-2) blue-green phosphors were synthesized by solid-state reactions. All samples exhibited a rhombohedral crystal structure. As Y3+ concentration increased, diffraction peaks shifted to small angle region and lattice parameters increased due larger ionic radius (r 0.900 Å) compared with that Lu3+ 0.861 Å). Under 400 nm excitation, strong emissions around 490 nm. The emission bands had slight blue shift resulted from weak crystal-field...

In this paper we reported on the optically pumped VECSELs with switchable lasing wavelengths. The two wavelengths of λ ≈ 954 nm and 1003 are generated at different pumping powers from same gain chip. thermal rollover output power is observed twice, first curve indicates switch wavelength. During operation our VECSEL, increase changes temperature within chip, thus spectrum tuned to one modes, which defined by dips reflectivity spectrum. maximum each wavelength exceeds 2.2 W -5 °C....

Purpose The purpose of this paper was to present a soft landing control strategy for biped robot avoid and absorb the impulsive reaction forces (which weakens walking stability) caused by impact between swing foot ground. Design/methodology/approach First, suitable trajectory is preplanned in direction. Second, are suppressed on-line modification based on extended time-domain passivity with admittance causality that has as inputs decomposed foot’s positions trim off outputs. Findings...

Purpose The purpose of this study is to present an optimization-based gait planning method for biped robots according the conditions terrain, which takes fully relationship between walking stability margin and energy efficiency into account. Design/methodology/approach First, authors newly designed a practical motion synthesis algorithm by using optimal allowable zero moment point (ZMP) variation region (OAZR), can generate different motions corresponding terrains based on modifiability ZMP...

In this paper, we present an optical structure for two-stage beam combination to realize a high-power fiber-coupled diode laser source. the first stage, dense spectral based on reflecting volume Bragg gratings is implemented combining five blocks with separation of 1.5 nm, high output power submodule. second submodules are further coaxially multiplexed by polarization and coarse obtain higher power. process combination, thermal effects elements also investigated. By using temperature...