Advanced Materials Research Vols. 468-471

Abstract: Due to uncertainties exist in the applications of the a permanent magnet synchronous linear motor (PMSLM) servo drive which seriously influence the control performance, thus, an integral backstepping control system using adaptive recurrent neural network uncertainty observer (RNNUO) is proposed to increase the robustness of the PMSLM drive. First, the field-oriented mechanism is applied to formulate the dynamic equation of the PMSLM servo drive. Then, an integral backstepping approach is proposed to control the motion of PMSLM drive system. With proposed integral backstepping control system, the mover position of the PMSLM drive possesses the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference trajectories. Moreover, to further increase the robustness of the PMSLM drive, an adaptive RNN uncertainty observer is proposed to estimate the required lumped uncertainty. The effectiveness of the proposed control scheme is verified by experimental results.

Abstract: Jilongshan Au-Cu deposit is a typical skarn deposit in the southeastern Hubei metallographic province of the Middle-Lower Yangtze River Fe-Cu metallogenic belt. But little study of ore-forming material source has been made in Jilongshan Au-Cu deposit. Therefore, we discussed the ore-forming material source by analyzing 15 lead geochemistry samples collected in Jilongshan deposit. The ranges of the Pb isotopic compositions are from 17.358 to 18.589 for 206Pb/204Pb, 15.414 to 15.745 for 207Pb/204Pb and 37.956 to 39.094 for 208Pb/204Pb, which are anomalous and their single-stage model ages cannot be used as a criterion for metallogenic epoch. However, the distributing characteristics of the single-stage model ages suggest that the ore Pb have mixing sources. The linear distribution of Pb isotope in tectonic model diagram suggests that the consistent relation of granodiorite porphyry, skarn, marble and ore, which is also a good proof that the ore-forming materials are partly from magma.

Abstract: In this paper, we presented a novel approach for automatic 3D face verification by range data surface matching. The method consists of range data registration and comparison. There are three steps in registration procedure: the coarse step conducting the normalization by exploiting a priori knowledge of the human face and facial features to make faces have the similar attitude; the next step considering the existence of holes in the low-resolution range data will undermining the recognition results, we presented a novel approach for holes filling to improve the range data quality; and the fine step aligning the input data with the model in the database by the Delaunay-Iterative Closest Point (D-ICP) algorithm. During the face comparison, a Modified Hausdorff Distance (MHD) is employed as the similarity metrics. The experiments are carried out on a database with 30 individuals, and the best EER of 1.667% is achieved.

Abstract: Compact spinning eliminated the harmful effects of spinning triangle, as the edge fibers are incorporated into the yarn due to the elimination of the spinning triangle. The compact yarns possess less hairiness, higher breaking strength and breaking elongation compared with the conventional ring-spun yarns. In this article, we study the mechanism of compact spinning with suction groove and analyze the compact action in twisting fiber strip. Some quality parameters of wool compact spinning with suction groove are compared with those of wool conventional ring-spun yarns. The changes of hairiness are analyzed in the different spinning conditions. This provides related data for improving compact spinning system with suction groove.

Abstract: This paper proposes an integrated three-dimensional(3D) shape acquiring and digitizing method for cultural heritage documentation by combining industrial close range photogrammetry and structured light scan techniques. The operation principle is introduced, the process of raw data acquisition and data post-processing are presented . A 2.5m high ancient Buddha sculpture of over 1500 years old located in Qingyang, China was measured and modeled to test the availability and reliability of the proposed system. Compare to conventional 3D digitizing methods, the proposed system can potentially meet a number of specific needs in the field of cultural heritage documentation, it is more flexible, low cost, less field work, capable of grabbing the 3D shape of large objects, meanwhile recording accurate detail information of local area, without physically contacting with object surface.

Abstract: The purpose of this study was to cooperate student-problem chart (S-P Chart) and ordering theory (OT) as an integrated method of cognition diagnosis. S-P chart was used to classify students into proper learning styles, In order to use OT to determine existing hierarchies among items with specifically learning style. Furthermore, an empirical data of capacity concepts testing for fundamental mathematics learning was analyzed based on the integrated method. The results showed that cognition diagnosis would be feasible for remedial teaching and design of teaching materials.

Abstract: Semi-IPN hydrogels in which silk sericin (SS) chains were physically dispersed throughout dextran (Dex) gel networks were synthesized. Highly stable distributed silver nanoparticles have been prepared using these semi-IPN hydrogels as a carrier via in situ reduction of silver nitrate without the addition of any reducing agent. The resultant semi-IPN hydrogel-silver nanocomposites were characterized by X-ray diffraction (XRD). And the swelling behavior of the hydrogles was also studied.

Abstract: The comparison analysis of performance with design point has been done in view of two different inlets, which were built by uniform shock intensity and shock angle method respectively. Base on this, the attack angle performance was emphatic developed on off-design point. The numerical calculation and analysis was conducted in eight different attack angle for air inlet conditions on two kinds of inlet respectively. The result indicated that, the inlet with uniform shock intensity method has 5% much more flow coefficient than inlet with uniform shock angle, in the condition of design point. In the condition of off-design point, the influence of the inlet performance is relatively small to the later kind of inlet with the increase of positive attack angel.

Abstract: This paper introduced the transmission links behind the turbine governor controller output link, and elaborated the interaction between these transmission links. Based on the example, the paper considered the universality of controlled object’s self-regulating and self-balancing from a new perspective, and cited how to use these common and convergence regular pattern ‘intentionally or unintentionally’ in turbine governor control. At last, the paper proposed some ideas of turbine governor control system design, and suggested how to deeply understand and use self-balancing ability of control object.

Abstract: Air conditioning and refrigeration equipment are more and more widely applied, It’s energy efficiency proportion of total energy consumption is growing. To evaluate energy efficiency and apply high grade energy efficiency of air conditioning , that can bring considerable economic benefits and improve energy-saving initiative for the enterprises. This has great practical significance to realize Chinese energy-saving task. In this paper the air conditioning energy efficiency ratio(EER), seasonal energy efficiency ratio(SEER) and integrated part load value(IPLV) are proposed and analyzed, Many evalution methods are put forword to provide appropriate evaluation criteria for enterprise, and the energy-saving measures on the different assessment criteria are also put forward, It has some guiding significance to improve the efficiency of air conditioning and refrigeration equipment.