Advanced Materials Research Vols. 538-541

Abstract: The measurement system based on industry CCD and image processing was established to measure 2D sizes of parts. The CCD sensors, lenses, illumination and image acquisition modes were chosen to establish hardware part, according to the requirement of views and precision. The software system was developed to extract the edge of the part from the digital image and transform it to a polynomial. The actual sizes of the part were measured with relative comparison calibrating method. Tests and analyses show that it is an untouched, automatic 2D Measurement system with high accuracy.

Abstract: To improve the precision of all-phase FFT (apFFT for short) phase measurement, this paper takes full advantages of the basic properties of apFFT spectral analysis and deduce the distribution range of sampling frequency. And through simulation experiment, this deduced range is verified. Moreover this paper points that, in contrast to the case of FFT, apFFT can acquire the high precision of phase measurement in a relatively wide range, which means that the hardware cost can be reduced. Therefore the proposed research is of both high theoretic value and of high engineering significance.

Abstract: Stress is affected by many factors in the course of bridge construction, which is introduced in this paper. The stress changes are affected by a lot of uncertain factors that can’t use mechanical method for clear calculation, so that make prediction of stress becomes very difficult in the period of practical engineering, in order to solve this problem, the grey theory and the wide applicability in bridge construction monitoring are introduced in this paper. The stress data processing method, data generation method of the new equal dimension information are defined and researched, which combine with the introduction of GM (1,1) residual error model of grey equation solution, stress development and trend are forecasted precisely in the practical experience in the process of control, so the problem which can’t be solved by the complicated mechanics is solved by mathematical method. And set the Baise zhuzhou bridge as an example, practice has proved that stress GM (1,1) residual error model with the new equal dimension information can be applied for bridge construction monitoring with a higher prediction accuracy. Suggestion of stress forecast are proposed for bridge construction monitoring according to the actual control experience.

Abstract: Monocyclic aromatic compounds (MAC) are one kind of the major organic environmental contaminants. In this paper, with self-made high Field Asymmetry waveform Ion Mobility Spectrometry (FAIMS) system, the high resolution and sensitivity detection of typical MAC has been carried out. By analyzing the relationship between the Dispersion Voltages (DV) and Compensation Voltages (CV), the second and fourth order nonlinear ion mobility coefficients of Chlorobenzene, O-dichlorobenzene, P-dichlorobenzene, M-cresol, P-nitrophenol, Benzyl alcohol and O-Toluidine are obtained. The spectra of nonlinear ion mobility and the FAIMS spectra of seven kinds of MAC are acquired, and the high efficient separation of these substance ions are realized. As high as 0.95 of linearity and about 20 ppb detection threshold for chlorobenzene are also demonstrated by linear regression. These results show that FAIMS is an effective method to detect the MAC and has great potential for field detection of organic environmental contaminants.

Abstract: Spherical diaphragm seal dish of tube channel open end in high pressure heat exchanger is a new engineering structure that used in petrochemical hydrogenation unit, and its design technology is not reported now. It is inconvenience to analyze each case by limited element method. Design method of formulas is proposed to calculate both radial offset displacement and its thickness of spherical diaphragm based on shell elasticity mechanics. Relation formulas are deduced about arch height, open end radius, offset displacement by geometry. Two presuppositions are deduced for spherical diaphragm successful to run according to technology theory and function analysis of seal dish structure, which can be used for engineering design.

Abstract: In this paper, when considering the conservation of energy, electric charge and angular momentum, we develop the Parikh-Wilczek’s quantum tunneling method to study the Hawking radiation of charged particles via tunneling from the event horizon of Kim black hole. The result shows the exact radiation spectrum deviates from the precisely thermal one, but satisfies an underlying unitary theory, which provides a possible solution to the information loss during the black hole evaporation.

Abstract: This paper establishes the theoretical model of Scholte wave velocity on the fluid-porous medium interface based on the Biot theory of porous media. We firstly simulates and analysis sound propagation characteristics of fluid-saturated porous, and then we deduces the secular equation of fluid-solid interface wave on semi-infinite half-space applying potential function method. This study will provide a theoretical guidance of detecting the interface wave between fluid and porous media.

Abstract: A test paper tape on the determination of nitrite in food was designed, which is based on the diazotization of nitrite with sulfanilic acid under weakly acidic conditions then coupled with N-(1-Naphthyl)-ethylenediamine dihydrochloride in forming the colour-producing response. Then the reaction membrane turned to purple-red. The deeper purple-red film was obtained in an increased nitrite concentration-dependent manner. Experimental results showed that nitrite concentrations were proportional to a values of the L a b color system. A favorable linearity was presented in the range of 25 to 5000 μg/mL. The correlation coefficient(r) was 0.984 and the whole testing time needed was about 1.5 min at room temperature.

Abstract: The applied loads have a significant role on the filtration property of soil and geotextile systems. This paper investigates the effects of normal pressure on the clogging behavior of geotextile and gap-graded soil filtration systems. The experimental results show that the clogging potential increases as the normal pressure increases. And a critical value for the normal pressure may exist. When the applied normal pressure is less than the critical value, the normal pressure has significant effects on the filtration systems. However, when the applied normal pressure exceeds the critical value, effects of the normal pressure on the soil-geotextile filtration systems are minor.

Abstract: This article is about the drinking water treatment process. We took the filter as the research object, and investigated the removal efficiency of permanganate index in different filtering conditions and water quality conditions, and discussed the effect factors. The experimental results show that the filtration column play the role of the organic contaminants reduced mainly during 0 ~ 40 cm deep from the top. When organic contaminants content in water is high, the permanganate index can be removed efficiently, and the removal rate of permanganate index is in proportional to time within a certain range. Turbidity has no obvious effect on permanganate index removal by filtration, but in order to obtain the ideal removal efficiency, the turbidities should be more than 10 NTU. When the hydraulic loading is in 1~ 2 m3 / (m2 • h), there is no much more effect on filtration efficiency.