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We realized, to the best of our knowledge, the shortest dark soliton pulse duration which is 408fs in a Yb-doped mode-locked fiber laser. The laser was centered at 1038 nm with a 9 nm bandwidth.
Few-layer black phosphorus (BP) is a two-dimensional material. BP was fabricated by mechanical exfoliation method. We have experimentally shown that the Q-switched pulse was generated in Yb-doped fiber laser based on the BP staturable absorber.
Plant resources have a wealth of field knowledge, and the method to build a standard and normal ontology in this field can contribute a lot for reusing and sharing knowledge in the field. This article briefly discusses the basic concepts and features of domain ontology, includes the basic methods of domain ontology construction, and sets Medicinal plants in Anguo region as examples, initially proposes...
We experimentally demonstrated a diode-pumped Kerr-lens mode-locked femtosecond laser based on a Yb:CaYAlO4 crystal. Pulses with a duration as short as 33 fs at the center wavelength of 1059 nm were obtained.
We experimentally demonstrated a diode-pumped pure Kerr-lens mode-locked femtosecond laser based on a Yb:YAG ceramic. Pulses with 97 fs pulse width, 2.8 nJ pulse energy and 320 mW average power were obtained.
We inscribed a single mode waveguide with the minimum propagation loss of 1.58 dB/cm at 1030nm inside the Ho3+-doped chalcogenide glass by femtosecond laser. The inscribing parameters are 0.4μJ pulse energy and 90μm/s translation speed.
We realized a diode-pumped Kerr-lens mode-locking operation in a Nd, Y-codoped CaF2 laser. Pulses with 357 fs duration at 1063 nm were obtained. The average power was 210 mW under 5 W pump.
We fabricated a buried single line waveguide within a depth of 100 $\mu $ m below the Tm3+-doped 75GeS215Ga2S310CsI (GGSI) glass substrate surface using a single line approach by femtosecond laser direct writing. The near field profile of the guided modes and the propagation loss of the fabricated waveguides were measured and discussed. Single mode guidance at 1039 nm has been demonstrated. The writing...
Pulses as short as 73-fs were generated from a Kerr-lens mode-locked Yb:YCa4O(BO3)3 laser at 1043 nm. To the best of our knowledge, this is the first demonstration of a Kerr-lens mode-locked Yb:YCa4O(BO3)3 laser.
The aim of logistics distribution center location is to improve the logistics service quality and reduce the transportation cost of goods. The problems are related to both the classical location problem and the vehicle routing problem. This paper proposes logistics distribution center location based on particle swarm optimization algorithm. It models the logistics distribution center location problem...
This study applies cluster analysis K-means method to analyze the data of regional product by Three Strata of Industry in China. Firstly, we give a review of K-means method, according to self-organizing feature maps we determine the number of clusters, and then employ the K-means method to find the clusters. From the cluster analysis we get four clusters and conclude that the membership in Cluster...
A diode-pumped mode-locking ceramic Yb:YAG laser with slope efficiency of 76% was demonstrated, output power up to 1.9 W was obtained with pulse duration of 418 fs and central wavelength of 1048 nm.
Numerical studies were conducted to investigate the beneficial effects of using arrays of jets on the aerodynamic characteristics of the High-altitude Long-endurance Unmanned Aerial Vehicle (HALE-UAV) airfoil. Flowfield predictions were made by using an unsteady, two-dimensional, compressible Navier-Stokes flow solver. An unsteady surface transpiration boundary condition was enforced over a user-specified...
This paper presents the knowledge acquisition model of traffic accident cause analysis method from the point of structured information. Moreover, this paper introduces the modified knowledge acquisition model based on relative rough set theory, which can obtain effective information based on the database otherwise data ware. By this model, we can efficiently obtain relative information real-time,...
This paper introduces an intelligent pre-control model of urban arterial which is the key problem of the urban traffic, especially in China. This study investigates the effects of speed control on traffic flow processes and develops a pre-control strategy to maximize the efficiency of urban arterial system, especially under the congestion conditions. Moreover, the traffic congestion forecast method...
Considering that there are three aspects of constrains in the service selection process, such as control structure within a composition plan, relationship between concrete services, and tradeoff among multiple QoS indexes, a QoS based optimal Web services selection method by multi-objective genetic algorithm is presented. First we design a chromosome coding method to represent a feasible service selection...
This paper introduces a group decision making of intelligent traffic control system based on multi-agent technique, in order to meet the urban traffic management actual demands of China. The model is designed to realize that several urban traffic managers and directors may taking part in decision at the same time based on the group decision theory and the multi-agent technique .Moreover, the required...
This paper presents an AI planning method for Web service automatic composition using Predicate/Transition (Pr/T) net model. First, based on Web service description of inputs, outputs, preconditions and effects in OWL-S specification, a Pr/T net model is constructed for a service composition plan. Then, this plan is effectively solved by a reachability algorithm of the Pr/T net and a corresponding...
In this paper a genetic algorithm-based optimization procedure for ontology matching problem is presented as a feature-matching process. First, from a global view, we model the problem of ontology matching as an optimization problem of a mapping between two compared ontologies, and every ontology has its associated feature sets. Second, as a powerful heuristic search strategy, genetic algorithm is...
Performance analysis is one of the most important aspects in the research of workflow technology. In this paper, we put forward an approximate performance analysis method of workflow model with resource constraints, which combines queuing theory and stochastic Petri net. In the end, an example is given to illustrates our method can solve real-world problems efficiently
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