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Galvanometric laser scanning technology is widely used in the field of laser processing, In order to obtain a good processing quality, the laser beam must be small and uniform on the entire working surface. Due to the error of the out of focus, the traditional laser focusing system focus on the curved surface, the more deviation from the focus center, the spot is more divergent, seriously affecting...
In the automated storage and retrieval system (AS/RS), a reasonable path-planning is fundamental for the effective work of AGV. For the rectangular environment map of the AS/RS system, the traditional Dijkstra algorithm can only find one shortest path, and skip over other paths with the same distance. An improved Dijkstra algorithm is proposed to solve the path-planning problem in the rectangular...
This paper presents a dual-band microstrip rectifier working at 2.45 GHz and 5.8 GHz for a low-power Wireless Power Transmission (WPT) system. The rectifier is composed of a matching network, a Schottky diode and a dc-pass filter (DPF). The fundamental frequency and the higher order harmonics created by the diode are effectively blocked by the "double-blade-axe" shaped DPF, which consists...
Combined with the numerical simulation of finite element method, this article explores the mechanism and distribution of unsymmetrically pressed mountain tunnel. According to the destruction patterns of surrounding rock, different calculation methods are used to calculate the safety of lining structure, and corresponding countermeasures against the main factors influencing the stability of surrounding...
In order to achieve real-time adjustment of the camera and produce satisfactory images, an embedded system oriented approach, which involves DSP and FPGA is proposed. The new method, combining traditional methods of gray scale mean value and information entropy of images has been empirically proved to maximize the information carried by the image, and ensures a proper brightness of outputs, it also...
Measurement of weak optical signals is becoming more and more prevalent in different fields of science. Single Photon Avalanche Diode (SPAD) is one of the most important active devices that are able to detect photons. When a photon is detected, the SPAD will generate an increasing current and a short duration voltage pulse. As a result, this SPAD device must be biased by a quenching circuit, which,...
Long-span multi-tower suspension, a new bridge system, is more adaptable to such geography condition as straits and bays, so the static wind load can not be ignored in the design and construction. As well as, the origin of performance difference between multi-tower suspension bridge and the traditional one is the existence of center towers. Therefore, property change of multi-tower suspension bridge...
Richard Cantillion first proposed that entrepreneurs raise the efficiency of economic resources from a low level to a high one. Entrepreneurship is a set of special entrepreneur skills (including spirits and skills), especially the abilities of innovating, taking business risks, undertaking pressures, and etc. Because of the complexity, the innovativeness, and the impossibility of direct acquisition...
This paper presents a high Signal-to-Noise Ratio (SNR) second-order Delta-Sigma modulator in which the delay accumulator in traditional structure is replaced by Al-Alaoui integrator. The SNR expression of new structure is obtained through frequency domain analysis on noise transfer function. The experimental results reveal that its performance overcomes that of conventional one with lower quantization...
The public technology service platform is an important content in the technological innovation system, in accordance with the requests of system integration, allocation optimization and sharing, in order to integrate a wide range of innovative carriers and resources and provide public innovation services within the region. This paper, Hangzhou Platform of Apiculture Technology Innovation Service as...
This article theoretically analyses how shareholder-manager disagreement affects corporate investment, and firstly tests this theory using panel data of China listed companies. The results confirm the negative effect of shareholder-manager disagreement on real investment in China stock market, and originally prove that disagreement theory may act as one possible explanation for investment sensitivity...
Economic development has brought about rapid population growth and urbanization. As a result, intensive use of urban land has become increasingly important. Colligation Evaluation, which can quantize the intensive use level of land and its determinants, is adopted to establish evaluation index system from aspects of land use intensity, land input, benefit and sustainability in order to evaluate the...
The self-anchored suspension and cable-stayed combination system bridge is a new type of bridge which is aesthetic in appearance and skillful for the design. In order to analyze the mechanical behavior of the bridge on the process of system transformation, the model of spatial member finite elements was established. In addition the model test with the similarity ratio of 1:20 was carried out. Through...
In engineering applications, piezoelectric materials are usually bonded to elastic substrates to form so-called smart materials and structures. Such materials and structures can respond to external electromechanical environments. This article studies a piezoelectric layer bonded to an elastic substrate subjected to static electromechanical loads, both of which are of finite length. A system of differential...
Mechatronics system is the combination of mechanical system and control system. Based on the research of mechatronics system, the control kernel architecture based on embedded ARM and field bus is proposed, which takes mechanical system as the control object, takes sensors and drivers as control interface. To meet the need of flexible manufacturing and reconfigurable design, a reconfigurable technique...
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