Search

Methylene blue is an organic dyestuff and damaged to human beings. Graphene-based composite is a new type of nanometer materials and with outstanding adsorption capacity of methylene blue than other materials in aqueous solution. This paper summarized and compared the difference among graphene, graphene-based composites and other materials in removing methylene blue in aqueous solution.

Mobile communication has gone through two generation of development, now the third generation mobile communication technology has been mature and widely used. Achieving the third generation mobile communication technology is intended to give users a better mobile voice call quality, faster mobile data speeds and more multimedia services, to attain large capacity and high spectral efficiency. W-CDMA, one of the three mainstream standard of international third generation mobile communication technology, is based on the foundation of GSM/GPRS and evolve. This paper describes the 3GPP core technology, which is based on W-CDMA, and using ADS to complete the simulation of W-CDMA/3GPP communication system.

This design used a low noise enhanced high electron mobility transistor ATF54143 and Agilent's ADS simulation software to achieve the good performance of operating frequency at 2.45GHz, noise figure (NF) is less than 0.8dB, band gain (S21) is greater than 15dB, input voltage standing-wave ratio (VSWR1) is less than 1.4dB, output voltage standing-wave ratio (VSWR2) is less than 1.6dB.

Carbon dots are novel fluorescent nanomaterials which have easy to preparation. They have good stability, low toxicity, environment-friendly and are widely used in biological imaging, biomedical, and biochemical analysis, metal reduction, fluorescence probe and optoelectronic devices. This paper summarized several new methods for the detection of metal ions with carbon dots.

Power capacitor is one of the key equipments of the high-voltage direct current (HVDC) transmission system. It is also the main noise source difficult to control. Presently in the world, there are none explicit requirement and regulation on the evaluation and measurement of the noise generated by the power capacitor, which has seriously restricted the development of the further research on the noise control in power capacitor. So the research on the noise measurement method and technology has extremely important significance in scientifically evaluating the noise of power capacitor. Power capacitor in HVDC Converter Station under practical conditions has apparent fundamental frequency and rich harmonic frequency components. In order to simulate this condition, a whole condition loaded bridge circuit of noise measurement on power capacitor has been designed and studied. Two arms of the bridge are used to load fundamental frequency and a parallel resonance compensation inductance is used to reduce the fundamental current, while the other two arms are used to load harmonic frequency. The harmonic frequency load power supply composed of harmonic signal generator and power amplifier which can simultaneously load any combination of harmonics under 48th to simulate the various actual working conditions. The tests indicated that the noise spectrum measured under the designed circuit completely accorded with the one in HVDC Converter Station.

Aiming at the path sudden change and inconsistent turning of virtual vehicles in visual simulation system for bridge cranes, forklifts virtual paths are created by using path and navigator modules in Lynx interface based on the application principles of path and navigator in Vega software. Then, forklifts visual paths are edited to ensure the natural and fluent movements of forklifts by choosing spline navigator, setting smaller smoothing threshold and smaller spline tension parameters in Path Tool. Finally, combining working cycle requirements of loading and unloading goods for bridge cranes, continuous motions of several forklifts are realized by calling the path navigation library functions of Vega Software in VC++. Therefore, virtual vehicles complex paths are created and disadvantages of fixed path for virtual vehicles in visual simulation system are solved.

Collision detection is the key technology in the visual simulation system for bridge cranes. According to analyse the collision between hook and virtual objects in visual simulation system for bridge cranes, collision detection method of visual simulation system for bridge cranes is determined based on the collision detection principle. First of all, LOS intersection vector method is chosen based on the principle of collision detection in Vega. Hook is designed for the collision target using Isector module in Lynx and the same intersection vector masks in Isector Class are guaranteed. Then, the BUMP collision detection for hook is created by calling vgIsector functions in VC++ and BUMP detection method of hook is bounded with hook. Finally, conditional statements which ensure hook to move without collision are compiled. Therefore, the virtual scene around the hook is detected in real time. The results show that the phenomenon of passing through by mistake for the hook can be avoided applying the BUMP collision detection method in Vega software in visual simulation system for bridge cranes, and the accuracy for BUMP method detecting the goods is improved using LOS collision detection method.

In order to achieve the function for automatic test paper and automatic scoring of blank-filling test module in the theory examination system for tower cranes, first of all, the blank-filling is classified based on the answer complexity of blank-filling, and the questions of blank-filling related table structure are designed. Then, test paper is automatically generated by extracting the corresponding questions based on the different random numbers generated random function rand (). Scoring is automatically accomplished by using the matching mode technology which compares the examinee answer and standard answer. Finally, the score is cumulated to calculated achievement for blank-filling test module by extracting the examinee score of the relevant information table. Therefore, the implementation of automatic test paper and automatic scoring can ensure the effectiveness of the test papers and the accuracy of the papers marked.

Security problem is the main factor restricting economic development of architecture. Fire accident, in particular, results in serious casualties and losses. As building structural layout is more diversified, there are more and more assembly forms of internal structures and facilities. Automatic fire alarm system is the key in building design and construction. The thesis first of all makes an analysis of the current construction fire accident, points out the application function of fire alarm system and analyzes automatic fire alarm system circuit junction, hoping to contribute to further studies.

Based on the study of ergonomics, this paper summarizes morphological characteristics of computer numerical control machine tool modeling, and according to the work functions and operation characteristics, it gives an analysis of the principles and requirements of computer numerical control machine tool modeling design and ergonomics, which will help broaden our thoughts in designing more vivid, lively and rapid new computer numerical control machine tool modeling.

The existing method is deficient when characterizing the features of rules in a nonterminating rule set through the notion of reachability. To address this problem, this paper proposes a refined reachable relationship analysis based on two notions of triggering reachable and activation reachable. A counterexample and the detailed proof in this paper show that our method is effective.

The paper aim the remote monitoring system of energy consumption in buildings based on GSM/GPRS by a case, and introduces the system framework, operating mode, transmission technology, equipments and installation requirements, as well as illustrating software composition and function of the data center. The system can reflect classified electricity consumption in monitored buildings correctly. It not only understand situation of energy consumption in real-time, but also offers basic data for further energy auditing and energy efficiency assessment. The conclusion can develop management of building energy consumption and increase the building energy efficiency.

Based on axisymmetric consolidation model, using a new initial condition derived from equilibrium equations and equal strain assumption, and considering the gradual variation of compression modulus and horizontal permeability of disturbed soils, an analytical solution was derived for the consolidation of composite ground with weak drainage columns subjected to an instant loading. Two types of variation patterns of compression modulus of the disturbed zone were considered. The consolidation behavior of composite ground with weak drainage columns was subsequently investigated in consideration of disturbance. The results show that without considering the gradual variation of compression modulus of the disturbed zone will underestimate the rate of consolidation; the size of disturbed zone has a greater influence on the consolidation rate; the larger the disturbed zone, the faster the consolidation rate is; the consolidation is faster if the linear distribution pattern of the variation of compression modulus of the disturbed zone is considered; the consolidation is slower if the exponential distribution pattern is considered.