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We propose a new design methodology to broaden the bandwidth of a single-section 90° branch-line coupler (BLC) with arbitrary coupling level. The method used here to broaden the BLC bandwidth is to replace conventional uniform transmission lines that would never be feasible in many implementations with nonuniform lines governed by a truncated Fourier series. Based on how impedances are profiled, the...
In order to improve the structural performance of a five-axis gantry milling machine, a design idea of adopting parallel optimum design for key components and complete machine was investigated. Using CAE (Computer Aided Engineering) software, the finite element analysis model of the five-axis gantry milling machine key components and the complete machine were established. Then the static stiffness...
Syslog play an increasingly important role as a technological means of security audit in the monitoring equipment and resources. From the actual needs,the project design and realize audit logging . Compare the differences between RFC5424 and RFC3164, and achieve the syslog protocol with rsyslog. The project use PHP programming to implement user management interface and support to query log with Combination...
Repeatability is one of important accuracy properties of precision automatic inspecting machine for aviation coupling (PAIM), which is a kind of post-process inspection machine used in production environment. General Measurement System Analysis (MSA) method is only suitable to single measuring-point independent sample. In order to evaluate the repeatability of PAIM, a new repeatability evaluation...
In order to optimizing the rock mass mechanical parameters of Xi-Luodu hydropower station, the neural network is improved by coupling the partial least-squares regression. And so the coupling method has best explaining ability to the system, Solving the problem that neural network model is not stable and the calculation velocity is slow, and overcoming the bad effect of the many layers relativity...
The concept, significance and importance of comprehensive transport hub in national transportation are described in this paper. The evaluation for comprehensive transport hub is discussed in two aspects of ontology characteristics and maturity of comprehensive transport hub. The function and impact of the comprehensive transport hub are analyzed particularly, the constructed method is indicated in...
The mathematical model was presented for the servo loading system with secondary regulation. Control performance under the disturbance of hydraulic and mechanical coupling was simulated with MATLAB. Simulation reveals that increasing of load pressure, output torque and rotational speed may deteriorate control precision. Load pressure fluctuation causes more influence on torque control system than...
The biodegradable composites made from secondary flber(SF) and cyanoethylated secondary flber(CSF) were prepared by press forming, and the effect of alkali pretreatment and combined pretreatment of alkali and silane coupling agent KH550 on secondary fiber and composites were investigated. The optimum content of SF is 10 wt% because the hot melt viscosity of CSF was higher than that of traditional...
To achieve the dimensional synthesis of planar four-bar linkages, it established the numerical atlases of coupler rotation-angle operator harmonic characteristic parameters and coupler rotation-angle function's harmonic components firstly. It achieved the basic dimension type of linkages and the mathematical model of coupler path based on complex-vector theory secondly, then acquired the formula of...
Cascading failures are found on many real nature and artificial complex networks. The logistics system is a complex and dynamical system, which is composed of several interactive sub-networks, including business network, traffic network and information network. And these sub-networks form a multi-coupled network architecture. So it also takes place on logistics networks. Based on the theory of cascading...
An electrical model of the 104 MHz radio frequency quadrupole (RFQ) accelerator at Peking University is introduced for RF design, based on which every crucial geometrical parameter is swept and selected carefully to improve the RF properties of the RFQ such as the intrinsic quality factor and shunt impedance for reducing its power consumption. Moreover, flatness tuning of the inter-electrodes voltage...
In this paper, a new railway transport pattern is provided which only a few carriages will stop at each station and every passenger will reach her terminal immediately without stopping at intermediate stations. Some key technologies of this new railway transport pattern such as operation principle, mobile docking, volume of passengers and the determination of train formation and luggage consigning...
In this paper, the dynamics of the coupled Lorenz-Rössler systems with the unidirectionally and the bidirectionally linear coupling are considered. The results show that not only the non-chaotic behaviors appear, but also the region for the chaotic behaviors can increase greatly because of the unidirectionally linear coupling. And the codimension-2 bifurcations can be born because of the bidirectionally...
With the economic development, the logistics industry has been considered as one of the important of industries. Based on extension of input-output table in Zhejiang Province, using association analysis of the logistics industry, the development of logistics industry in Zhejiang conducted an empirical study, identified the position of the logistics industry in Zhejiang Province of national economic...
Simple, compact low-cost microwave bandpass filters with strongly asymmetric characteristics, based on new topologies, are investigated, designed, fabricated and measured. A classical fourth-order filter or quadruplet, for example, has two transmission zeros located symmetrically, one on each side of the passband. A filter of the same order and, consequently, with a similar insertion loss, can offer...
Bursting oscillation in neurons and other excitable cells is thought to be the primary mode of electrical behavior in many biological system. In the previous work, we studied the bursting types in the single Morris-Lecar model with current-feedback control. In this paper, based on studying the nearly complete synchronization of two electrically coupled bursting neurons, we do the further research...
Constraint programs such as those written in high level modeling languages (e.g., OPL, ZINC, or COMET) must be thoroughly verified before being used in applications. Detecting and localizing faults is therefore of great importance to lower the cost of the development of these constraint programs. In a previous work, we introduced a testing framework called CPTEST enabling automated test case generation...
This paper presents a methodology to design and to optimize inductive power link for biomedical applications. The importance of the operation frequency on the application is expressed. A model of inductive link is presented. The dimensions of the coils are compatible with the size of a mouse and the mouse cage. The simulation results are in good agreement with the analysis.
This paper presents a modified particle swarm optimization (MPSO) algorithm to design an optimal multi input multi out (MIMO) fuzzy logic controller for a cement mill process. The membership function, rule base and the scaling factor of the multi input multi output FLC is tuned for optimal control performance using MPSO by minimizing the Integral absolute error for minimum and maximum operating setpoints...
The modulation of chemical connection on neuron firing pattern is investigated in a coupled Hind marsh-Rose model with distributive delays. Simulation results show that chemical coupling not only can improve the spiking-bursting transition, but also may stabilize the coupling induced quiescent phase and induce oscillation death. Detailed characterizations of the transition are given. It reveals that...
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