Timetable and vehicle scheduling are important for transit operations. Electric buses more environmentally friendly compared with conventional buses, have been developing rapidly may replace in many cities worldwide. This paper focuses on the bus timetabling problem electric develops a multiobjective optimization model single line operated buses. The objectives include smoothing departure intervals minimizing number of vehicles total charging costs. constraints reflect limitations related to...

We present thermally regenerated fiber Bragg gratings in air-hole microstructured fibers for high-temperature, hydrostatic pressure measurements. High-temperature stable were during an 800 °C annealing process from hydrogen-loaded Type I seed gratings. The wavelength shifts and separation of grating peaks studied as functions external 15 to 2400 psi, temperature 24 °C. This Letter demonstrates a multiplexible sensor technology high-temperature environments using single optical feedthrough.

Based on double-line-of-sight measuring relative navigation method, an approach guidance law with the triangle-measuring constraint is presented for autonomous rendezvous. The observability of system analyzed using state estimation error covariance matrix. described as a keep-out cone. designed via artificial potential function method. It ensured that there high region in cone and still has unique minimum at goal position. Numerical simulations are undertaken to verify method proposed....

We present a continuous liquid level sensing system for both room temperature and cryogenic fluids with millimeter spatial resolution. Change of in-fiber Rayleigh backscattering signal from the distinct thermal response heated fiber in air were interrogated spatially resolved using optical frequency domain reflectometry. Both electrical heating techniques investigated applications at 4 K, 77 temperature. The successful combination self-heated wavelength-swept scattering interferometry...

A modeling method based on multi-objective genetic algrithm (MOGA) for thermal error of NC lathe is proposed in this paper. Firstly, a coupling analysis component deformation the machine tool used to determine positions equivalent temperature measurement points and establish estimation model errors according physical characteristics each component. Then one objective function formulated while other determined by testing data experiments. At last MO-GA applied with high robustness obtained.

Relative motion control strategies for autonomous rendezvous operations in a near-circular orbit are presented this paper. The relative equations described by classical element differences adopted and the periodic drift along-track is deduced from equation. two different measurement cases designed based on characteristics of motion. In first case, measurements range line-of-sight angles available to estimate position velocity. three-axis impulsive adjust along-track, radial, cross-track...

This paper is a study on novel configuration switchable hydraulically interconnected suspension (CSHIS) system based nonlinear model predictive control (NMPC). The proposed CSHIS has significant improvements in stability and performance than the existing systems. uses direction valve for switching, improves overall vehicle dynamic performances. developed NMPC algorithm enhances actuator process by predicting states, consequently performances power consumption of vehicle. A firstly...

In view of high discharge temperature compressor, the heating performance attenuated seriously, even unable to work properly and other issues normal heat pump air conditioning system for electric vehicles under low conditions, a gas-mixing pure is designed. Based on first law thermodynamics coupling properties among all components, mathematical model this established. The analog computation main parameters carried out by model, having better match in comparison with experimental results. By...

With the increasing popularity of private cars, incidence traffic accidents has increased year by year. Among them, drunk driving and fatigue account for a large part reason. Aiming at this situation, safe system offers practical effective solution. The consists three modules: anti-collision, anti-drunk anti-fatigue driving: STM32 is used as core to expand outward. HC-SR04 ultrasonic range finder detect distance from front obstacle. side-heated semiconductor alcohol gas sensor MQ-3...

This paper presents a backstepping sliding mode control (BSMC) method for an active anti-roll hydraulically interconnected suspension (HIS) system. The proposed strategy enables the HIS system tracking desired moment within working area. Based on error, BSMC controller calculates flowrate of cylinder. successively changes pressure in accumulators and cylinder chambers, finally determines output HIS. parameters uncertainty system’s nonlinear characteristic are both considered controller. To...

This paper introduces a novel switchable dual accumulators hydraulically interconnected suspension (SDAHIS) system. The proposed SDAHIS system can improve the ride comfort and anti-pitch performances simultaneously compared with existing (HIS) uses two-way valve for switching. developed achieve function by controlling connection of two accumulators. To comprehensively study system, model seven-DOF vehicle are established. is validated bench test. simulation results full show that improved....

The B-dot sensor is a type of Rogowski coil widely used in the measurement current. However, accuracy for measuring aircraft high-frequency lightning current greatly affected by factors such as numerical integration drift, oscillation, and calibration. In this study, new design optimization improving was carried out. To correct drift integral signal differential mode, reconstructed based on nonlinear least squares method. then optimized isolating sampling resistance matching impedance with...

A monolithic, 27-meter long waveguide having optical loss of less than 0.1dB/m is demonstrated. The same process produces resonators Q factors as high 875 million. Applications are reviewed.

A compact UV pulsed laser pumped by high-power two-dimensional arrays of vertical-cavity surface-emitting lasers (VCSELs) was presented. passively Q-switched 1064-nm Nd:YAG side-pumped kW-class 808-nm VCSEL pump modules and the output pulses were frequency quadrupled to 266-nm. 10-ns, 0.68-mJ obtained at 1.33k-Hz repetition rate. The average power is < 0.9-W. This high source provides a reliable, low-cost low-profile solution for military commercial applications including remote sensing,...

One of the recent trends in radiation therapy is to increase conformal and accurate dose delivery such as stereotactic radiosurgery (SRS). Treating small lesions brain disorders requires placement fields deep inside human cranium. To design a collimator meeting these requirements, new numerical concept was developed, which presented here. The algorithm proposed here can generate beam profiles plural collimation apertures arbitrary initial spot distributions time-efficient method. It an ideal...

We report a reference interferometer technique to monitor optical-cavity, resonance-wavelength shift below one femtometer. With this method, single nano-beads at record 12.5 nm radius and Influenza-A virion in aqueous environment are detected.

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text T. Chen, H. Lee, J. Li, O. Painter, and K. Vahala, "27-Meter-Long Ultra-Low-Loss Optical Delay Line a Silicon Chip," in Conference Lasers Electro-Optics 2012, OSA Technical Digest (online) (Optica Publishing Group, 2012), paper CTu3I.1. Export BibTex Endnote (RIS) HTML Plain alert Save article