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This paper presents the design of a 6-bit, 25 Msps, reference voltage programmable delay-line Analog-to-Digital Converter (ADC), which is aimed to use in the digitally controlled DC-DC switching converters. A new differential bias circuit is used to improve the linearity of delay cells and also the ADC. The reference voltage can be adjusted from 1.8 V to 2.5 V with 0.2 V step, and the input voltage...
Object recognition is one of the most popular tasks in computer vision. Various works have been reported in recent years. Bag of visual words (BOVW) is shown to be an effective model for this task. BOVW extracts features or visual words from the whole image. However, we know there are two kinds of information in an image: objects and background. Obviously, the features in the objects and background...
Recognition of outer membrane proteins (OMPs) from non-OMPs (global protein or inner protein) is one of the most important tasks in the field of computational biology and bioinformatics. Successful discrimination of OMPs from other types of proteins would help to identify new OMPs for biological applications. In this article, protein sequence index (PSI) and dipeptide motifs were applied to recognize...
Based on a modified amino acid network model, the dynamic simulation trajectory of a small protein (3CI2) is analyzed. The ration between different type of links is calculated, and the change of the long-rang link is calculated at the same time. With the conformation cluster analysis, the transition state can be got, and the network parameter betweenness of this state is analyzed.
Based on a self-consistent contact energy, an amino acid network model is proposed to improve the shortcoming of the model constructed early. The model used in this paper contains two types of weight - similar weight and dissimilar weight. The definition methods of the distance between nodes are compared and the small world character of the amino acid network is investigated. Finally, the network...
The problem of low precision exists in current measurement techniques. This paper introduces the structure and working principle of the liquid level measurement system of laser triangulation and carries out a high-precision real-time on-line measurement of the water surface height variation by using the liquid level measuring system. This paper introduces the structure of the laser triangulation displacement...
Effects of Ca(NO3)2 stress on the root volume, root-shoot ratio and chlorophyll contents of cucumber seedlings were investigated. Two cucumber cultivars (Chun 4 and Jinyou 1) were used by sand culture. The results were as follows: root volume, root-shoot ratio, chlorophyll a (Chl a) contents, chlorophyll b (Chl b) contents and total chlorophyll (Chl t) contents of two cucumber cultivars all decreased...
Abrasive flow processing is a new kind of surface polishing technology which is widely used for processing complex cavity parts. This paper will systematically illustrate an outline about abrasive flow technology. In addition, it also dedicated to introduce the principle of processing as well as the development & application of abrasive flow. Furthermore, based on the study of Ultra-Precision...
Designed for measuring the level of liquid, this system based on charge-coupled device (CCD), in combination with laser triangulation method and graphic program language of labview, accomplished signal acquisition and processing. By making experiment with this system and analyzing experiment data, the system has achieved the accurate experiment result. In this paper, it introduced the philosophy of...
The diameter of a 1-kg silicon sphere needs to be accurately measured to determine the volume and density to investigate the Avogadro constant. The diameter of the silicon sphere was measured using phase-shifting interferometry with an algorithm with an accuracy of 0.01% of the phase period. The algorithm accurately analyzes the phase map without strict positioning of the phase-shifting step. A phase-shifting...
Abrasive flow machining technology has become an effective way for micro-hole precise machining. In this paper, we design an equipment for abrasive flow machining to achieve precise machining for peculiar parts. The Fluent, fluid dynamics software, is used here to simulate the abrasive flow micro-hole processing state. We can achieve an ideal machining program for abrasive flow through comparative...
The text researched the insulation work of fiberglass frame when it supports in favor of temperature difference. According to the require, we designed and calculation the insulating work layer thickness size h of the fiberglass frame member. Adopting finite element analysis, we calculated the thermal field in temperature difference inside and outside the fiberglass frame member, analyzing the property...
In this text, the method of deformation calculation for the thin wall member under shock load. We made research into impact, distortion of the thin wall member which is under constraint condition of freely supported beam by dint of emulation though MATLAB and the finite element analysis software ANSYS, the object of this research is aluminium alloy thin wall member.
Competitive advantage today is no longer solely measured by an abundance of natural resources or material production. It is generally acknowledged that intangibles such as knowledge now lead to firms being more flexible and thus more competitive. To understand the development of competitive advantage, we must understand knowledge especially tacit knowledge and how it is shared. Therefore, based on...
This paper presents the techniques about microhole abrasive flow machining techniques of the abrasive flow machining crafts through controlling the relative motion between the workpiece and the abrasive flow by controlling motion speed of the abrasive cylinder piston, and improving machining accuracy and efficiency. Abrasive flow maching through motor-driven the abrasive cylinder piston is achieved...
In this paper, by the review of abrasive flow machining (AFM) and the principle of traditional process technology, a new polishing process technology about polishing internal surface of bend pipe, which is simpler, is developed. The turbine blade, which is a component of polishing ball, is designed and simulated by ANSYS-CFX (Blade Geometry, Advanced CFD and simulation). The flow of grinding media...
Monomer pump is an engine's key component in the Altogether track feed oil system. When engine running, the monoblock pump is under high temperature, high pressure and easy to wear condition. Facing coat of monoblock pump is essential to enhance the engine's lifetime by elevating its resistance to high temperature, wear and corrosion. In this paper, the sputtering power, sputtering time, total sputter...
The self-designed Abrasive Flow Machine and Clamp are introduced in this paper. The technology issues of abrasive flow medium selection and process parameters settings are discussed. We conducted the experiment on the small hole with diameter of 0.15 mm. Through the experiment, the best process parameters of the Abrasive Flow Machining of small hole are obtained.
The particular charm of contemporary information technology can inspire study interesting of students, improve the quality of teaching, and open a door to the reformation of educational and teaching. The contemporary information technology with the teaching theory establishes the base of education and teaching reform, its development improves the revolution of classroom communion. The combination...
With the constant deepening of the reform of teaching, implementing educational IT in higher education is an effective method to guarantee the universities teaching quality. In this paper, ire elaborated the important role of a modern educational IT to integrate the curriculum content, teaching methods and the reform of class teaching, the important role of mobilizing learning activity and let students...
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