Advanced Materials Research Vols. 301-303

Abstract: Aiming to the application of high-power LEDs in road lights, this article discusses the requirements of optical properties of LED road lights. It carries out the reflector-based secondary optical design of the selected LEDs, which is simulated with ASAP. The results show that this design can take full advantage of the optical properties of LED light sources, greatly improve the efficiency of LED road lights, and improve the uniformity of road lighting, so as to achieve the effects with which those effects produced from the traditional lights cannot be compared.

Abstract: In this paper, a fabric defect detection method based on Gabor filter bank is present. In this method, the parameters of Gabor filter bank depend on the fabric texture feature. Using the Gabor filter bank with multi-frequency and multi-orientation, a textile image produces multi-image. Then, the images are reconstructed into one image for detecting defects. It is illustrated that most kinds of defects are correctly detected and segmented. The experimental results show that the algorithm is robust and has good detection effect.

Abstract: Vapor liquid equilibria (VLE) of two binary mixtures (ethylene glycol + glycerol and 1,2-propylene glycol + ethylene glycol) were measured at 20Pa. The experimental data satisfy the thermodynamic consistency by Herington method. The vapor phase can be considered as ideal phase, while the non-ideality of the liquid phase was symbolized by Wilson and NRTL activity coefficient models. The experimental data were regressed and correlated by nonlinear least square method of Matlab optimization toolbox. It is found that under the medium vacuum the relative deviations between experimental data and calculated results by the activity coefficient models for low and moderate pressures are larger than 50%. Hence a cubic polynomial regarding the molar composition of liquid phase as the correction of the models was proposed and used in regression to get the interaction parameters. The results showed that the relative deviations between calculated and experimental data are smaller than 1%. The corrected models can provide a calculation basis or data reference for medium vacuum distillation.

Abstract: The alkyl phosphate prepared by phosphorus oxychloride and fatty alcohol contained a large amount of hydrochloric acid but no chloride. So the content of phosphate mono- and diester couldn’t be determined by conventional method. In this paper the content of hydrochloric acid was determined by potentiometric titration at first, and then the conventional method can be used to detect the content of mono- and diester and phosphoric acid. In this way each component of the alkyl phosphate can be ascertained accurately. The method was verified simply and conveniently by verification test that could avoid extraction, recrystalli- zation and other cockamamie operation. It also had stronger application and good reproducibility.

Abstract: Compressed sensing seeks to recover a sparse or compressible signal from a small number of linear and non-adaptive measurements. Gaussian random matrix is a kind of fundamental measurement matrices, but its performance isn’t perfect because of more errors in recovery. This paper studies a new kind of matrix based on improving Gaussian random matrices. Measure sparse signals with improved matrices and recover original signals with orthogonal matching pursuit. Numerical experiments showed that the quality of recovered signal by improved measurement matrices is better than Gaussian random matrices.

Abstract: A new approach was presented in this paper to partition slub yarn into slub parts and base parts. A voltage signal proportional to the line mass density of slub yarn was firstly acquired with a capacitance sensor and a DAQ (Data AcQuisition) card. Some digital signal processing methods, such as digital filtering and re-sampling, were adopted to reduce the negative affection of sampling noises. An unevenness elimination method was presented to reduce the negative affection of yarn count unevenness, and a greedy algorithm was also presented to calculate the key threshold separating the base and slub parts. Experimental results show that the slub yarn can be partitioned effectively with the presented approach.

Abstract: This paper presents a novel RFID antenna which makes solar cell and tag antenna combine as an integrated unit. The solar cell is used as a parasitic element in a tag antenna. The original feature of a solar cell (DC current generation) remains, and the solar cell which can supply the energy to activate the IC is now used as a parasitic patch at the same time. Besides a general description of solar cell antenna, the size and the simulated results of the antenna are also shown.

Abstract: Prediction of chemical shifts using quantum chemical calculation is helpful for assigning nuclear magnetic resonance (NMR) spectra, and very important in structure determination. In this paper, we calculated ¹H chemical shifts (δH) of poly (methyl methacrylate) (PMMA), poly (4-vinyl phenol) (PVPh) and their polymer blends. Density functional theory (DFT) was used to computeδH of hydroxyl groups (OH) for both PVPh homopolymer and PMMA/PVPh polymer blends. The calculated values forδH of OH groups with or without forming hydrogen bonds agreed reasonably well with the experimental values. It was found that the δH of OH groups moved downfield when they formed hydrogen bonds with both other OH groups and carbonyl groups (C=O). The simulated solid state ¹H NMR spectra based on the B3LYP // GIAO method yielded results for the PMMA, PVPh and PMMA/PVPh, showed excellent agreement with the experimental results. It indicates that the ¹H NMR spectra are influenced by the main-chain conformations and the hydrogen bond types.

Abstract: In this paper, application of coordinate measuring machine(CMM) in reverse engineering(RE) of product was introduced. Reverse engineering had become a viable method to create a digital model of an existing physical part and to duplicate it. The reverse engineering process involves measuring an object，reconstructing its point cloud as a digital model and rapidly machining it. Application of obtaining point cloud using CMM was presented in reconstructing the digital model of a shoes tree. Rapid duplicate of a severely worn cam of textile machinery was realized by contact measuring profile points using CMM. Reconstructing the digital model and locally modifying the computer model in computer aided design (CAD) software. Finally, numerical control program was finished in computer aided manufacturing (CAM) software. Automatic measurement close freeform curve function of CMM decreased the workload of picking up data of cam profile. Experimental results showed using CMM can greatly save time and alleviate intension of labour.

Abstract: This project produces a system that Handles the entire scan routine on the MCU of STC12C5A60S2. This file contains the control of the stepper motors as they move the scanner head across the entire platform. Also starts the ADC conversions for scanning light intensity using the phototransistors and sends them to MATLAB. Nothing is done until a start command is received from MATLAB, in the form of the ASCII string "start". The stop command is conversely, the ASCII string "stop"