403 research outputs found
Woven fabric with water-content managing performance
No full textInventor name used in this publication: Hu Junyan, 胡军岩Title in Traditional Chinese: 具有水份管理性能的機織織物ChinaVersion of Recor
Quantum Measurement of Single Electron State by a Mesoscopic Detector
No full textA realistic measurement setup for a system such system measured by a mesoscopie detector,is theoretically as a charged two-state （qubit） or multi-state quantum studied. To properly describe the measurement-induced back-action,a detailed-balance preserved quantum master equation treatment is developed. The established framework is applicable for arbitrary voltages and temperatures
Analysis of the microcharacteristics of different kinds of asphalt based on different aging conditions
No full textAsphalt aging often leads to rapid degradation of road performance, which seriously affects the service life of asphalt pavement. Exploring the influence of asphalt oil sources, asphalt grades, and filler types on asphalt microcharacteristics in the asphalt aging process can provide an essential reference to guide asphalt pavement maintenance. In this study, we selected seven kinds of asphalt and three fillers commonly used in China for research. The pressurized aging vessel (PAV) and homemade ultraviolet (UV) aging equipment were used to perform thermo-oxidative aging and UV aging tests, respectively, of asphalt. The microcharacteristics of asphalt before and after aging were analyzed via attenuated total reflectance fourier transformation infrared spectroscopy and nuclear magnetic resonance 1H spectroscopy. The results show that the oil source of asphalt exerted the most significant influence on the microcharacteristics of the aged asphalt, while the effect of the asphalt grade was relatively limited. The addition of fillers did not affect the aging mechanism of asphalt. UV and PAV aging generated apparent differences in the changes in the aged asphalt microstructure.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Pavement Engineerin
Effect of fiber length and dosage on the performance of reed fiber-modified bitumen and mortar
No full textCivil Engineerin
Thermal Evolution of Adsorbed/Occluded Hydrocarbons inside Kerogens and Its Significance As Exemplified by One Low-Matured Kerogen from Santanghu Basin, Northwest China
No full textOrganic compounds-could be adsorbed and even occlutled within the macromolecular Structures of kerogen. Studies concerning thermal evolution of adsorbed/occluded hydrocarbons inside kerogen will be helpful in understanding its structural characteristics and-evolution features and estimating the-effectiyeneSs.olaclsorbed and occluded-fractions. In this work,. adsorbed and occluded hydrocarbons have been released from low-matured kerogen from the upper Permian Lucaogou formation of Santanghu Basin, north-West China; and from its pyrolysis residues by solvent extraction and oxidative treatment, respectively. The results showed that some n-alkanes, terpanes,and stetanes were detected from both adsorbed and occluded fractions. Series of even-carbon-numbered n-alk-(1)-enes were also determined from the occluded components. The early stage of thermal evolution showed similarities in biomarker features for both,adsorbed and occluded hydrocarbons; however, variations were noted in biomarker composition's with increasing thermal levels. The obvious changes Of C21-22 pregnane/C27-29 sterane ratios from adsorbed to occluded fractions at high thermal evolution suggested that high concentrations of pregnane (containing homopregnane) in soluble components in highly or overly mature stage may be mainly derived from the corresponding components covalefitly bound within kerogen.,Occluded components exhibited stronger thermal stability than adsorbed components. This study showed that evaluation,of the thermal evolution characteristics of kerogens/source rocks based on bioniarkers compositions from the adsorbed components at highly to overly matured stages was difficult, while we hope this kind of assessment of kerogens/source rocks can be achieved from occluded components
An Innovative Tri-rotor Drone and Associated Distributed Aerial Drone Swarm Control
No full textThis paper presents a novel unmanned aerial vehicle platform based on a three rotor configuration, which can achieve the highest level of maneuverability in all 6 dimensions (i.e. 3D position and 3D attitude). The three propellers can be tilted independently to obtain full force and torque vectoring authority, such that this new aerial robotic platform can overcome the limitations of a classic quadrotor UAV that cannot change its attitude while hovering at a stationary position. A robust feedback linearization controller is developed to deal with this highly coupled and nonlinear dynamics of the proposed tri-rotor UAV, which linearizes the dynamics globally using geometric transformations to produce a linear model that matches the Jacobi linearization of the nonlinear dynamics at the operating point of interest. A distributed formation control tracking protocol is then proposed to control a swarm of tri-rotor UAVs. The 3D position and 3D attitude of each vehicle can be controlled independently to follow a desired time-varying formation. The effectiveness of the designed control strategy is illustrated in a realistic virtual reality simulation environment based on real hardware parameters from a physical construction.</p
Cooperative Adaptive Time-Varying Formation Tracking for Multi-Agent Systems with LQR Performance Index and Switching Directed Topologies
No full textThis paper presents a novel distributed adaptive time-varying formation tracking protocol for general linear multi-agent systems. In contrast to the existing distributed methods that require global information of the interaction graph, the proposed control strategy is fully distributed such that each agent only requires its own information and the information from its neighbors through switching directed communication networks. Then, an algorithm to determine the control parameters is presented, where feasible formation condition for the followers to accomplish the desired time-varying formation tracking is provided. Furthermore, the proposed strategy is also guaranteed to achieve an optimal control performance index by using the inverse optimal approach. Simulation results are provided to verify the effectiveness of the proposed strategy
- …
