bluuebunny/crossref_metadata_2025 huggingface dataset:
On an Optimal Linear Control of a Chaotic Non-Ideal Duffing System
Authors: Chavarette Fábio Roverto
Published: November 2011

In this work, we use a nonlinear control based on Optimal Linear Control. We used as mathematical model a Duffing equation to model a supporting structure for an unbalanced rotating machine with limited power (non-ideal motor). Numerical simulations are performed for a set control parameter (depending on the voltage of the motor, that is, in the static and dynamic characteristic of the motor) The interaction of the non-ideal excitation with the structure may lead to the occurrence of interesting phenomena during the forward passage through the several resonance states of the system. Chaotic behavior is obtained for values of the parameters. Then, the proposed control strategy is applied in order to regulate the chaotic behavior, in order to obtain a periodic orbit and to decrease its amplitude. Both methodologies were used in complete agreement between them. The purpose of the paper is to give suggestions and recommendations to designers and engineers on how to drive this kind of system through resonance.
A Novel Sliding Mode Motion Control for Parallel Mechanism of Virtual Axis Machine Tool
Authors: Gao Guo Qin , Zheng Hai Bin , Niu Xue Mei
Published: November 2011

This paper addresses the motion control of the parallel mechanism of virtual axis machine tool, which has a complex system model, the nonlinear and strong coupling characteristics and has strong external disturbances in high-speed machining. To further enhance its motion control performances, a novel adaptive dynamic sliding mode control method is proposed. The designed control system stability is proved theoretically. By building a new switching function, the second-order dynamic sliding mode control algorithm is designed to reduce the chattering of the conventional sliding mode control effectively and overcome the adverse effects of the fast changing dynamics of the actuators. By introducing the adaptive control, unknown external disturbances can be estimated online, which can improve the ability of resisting strong disturbances and the control precision of virtual axis machine tool. The simulation results for the virtual axis machine tool show that the designed control system has the good performances in tracking and resisting strong disturbances and can achieve the high precision motion control of the parallel mechanism of virtual axis machine tool.
The Control Method for Positioning Bed of the Body Gamma Knife Based on the Breathing Sensors
Authors: Liang Hao Fang , Shan Guo Yong
Published: November 2011

Objective: To counteract the organ motion caused by respiratory movement through controlling the positioning bed’s synchronous motion with the organ with the breathing sensor in body gamma knife treatment. Methods: The displacement curve of relationship between lung volume and organs in the lung was obtained by acquiring respiratory signals with the piezoelectric film respiratory sensor. Used single chip microcomputer to control stepper motor which spurts the positioning bed through the transmitter to make it move simultaneously in real time according to the law of organ motion, so as to counteract the organ motion caused by respiratory movement and thus to improve the precision of radiotherapy. Results: The experiment indicates that this method can make the steeper motor move according to the displacement curve. Conclusion: It is feasible to counteract the organ and tissue motions caused by respiratory movement by making the positioning bed reversely move in real time in accordance with the law of organ motion during radiotherapy treatment.
Analysis for a Support Structure of a Horizontal Axial Tidal Current Energy Conversion System
Authors: Zhang Liang , Ge Pei , Sun Yao Gang , Jin Feng Mei , Wang Xiao Hang
Published: November 2011

This paper presents a support structure for gravity-based horizontal axial tidal current energy conversion system considering factors such as strength, reliability, and costs of transportation and installation, etc. The support structure is an important part which directly affects the operation of tidal energy conversion system. ANSYS Workbench is used to determine stress and deformation of the structure subjected to current loads, wave hydrodynamic loads and inertia loads. Nonlinear contacts effects between framework and base structure are taken into account in our calculation. In order to facilitate offshore installation of framework and base structure, some work is done to explore the effects of contact height between internal and external tube and wall thickness of internal tube to the strength. The results show that the strength and stiffness of support structure comply with the design requirements, and the research work provides a valuable reference for the development of harnessing of tidal energy.
TiCu-Based Bulk Metallic Glasses Exhibiting Large Compressive Plastic Strain
Authors: Zhang Xin Fang , Guo Xiao Qin , Kim K.B. , Yi Seong Hoon
Published: November 2011

TiCu-based bulk metallic glasses with large plasticity (up to 10%) were fabricated by copper mold suction casting. The detailed studies showed that the large plasticity resulted from the nanoscale heterogeneities formed upon solidification, which resulted in extensively shear band formation, branching and interaction.
Design and System Level Simulation of Double-Mass Silicon Micro Gyroscope
Authors: Shi Qin , Qiu An Ping , Yan Su , Feng Rui
Published: November 2011

The double-mass silicon micro gyroscope prototype, mechanical structure and working principle are introduced, which has high sesitivity. According to dynamic equations, the signal characteristics are analyzed and the mathematical models of scale factro and bias are established. Then the system level model is established on Simulink platform, including mechanical errors and electrostatic coupling errors and the performance are evaluated. Finally, five gyroscope prototypes are tested, and the performance parameters are as follows, the scale factor is 15.63~19.210mV/°/s, bias stability is 8.9~23.9°/h, bias repeatability is 7.5~19.4°/h.
Investigation and Simulation on Amorphous Formation and Growth
Authors: Li Ning , Chen Wei Zeng
Published: November 2011

The amorphous formation mechanism was studied from the viewpoint of the crystallography. The experimental results showed that the heterogeneity atoms with chemical bonds had a higher capability of forming into compounds than that of congener atoms. It was proposed that the banded structure was induced by the variation of active atoms with a proper thickness, alternated depletion and enrichment of anions in the diffusion layer due to generation and evolution of hydrogen gas. The chemical force plays an important part in the formation. The factors working on chemical reaction affect the formation in the same. A number of steady motes are in a high speed movement, and collide with each other in all probability. The formation of amorphous alloys is the result of massive nucleus appearance, which was proposed from the crystallography in this paper. The cause of the chaotic distribution is of the suppression of each nucleus growth. The short-range order atomic structure is of the atomic nucleus growth orientation. And the long-range disorder structure is of the massive nucleus suppression growth.
A Finite Element Model of Roll-Over Protective Structures for Wheel Loader Frame
Authors: Wei Zhan Guo , Cheng Xu Feng , Liu Jin Hao
Published: November 2011

ROPS is an effective way to reduce casualty rate in the rolling accident. This paper introduces the design of a cab to strengthen safety-ROPS large wheel loader method. The finite element model, it's a ROPS rear, absorbers and supporting structure frame of the safety-cabs, was created. Force and displacement boundary conditions obtained in accordance with the international standard ISO3471:2008-The large deformation elastic-plastic finite element analysis, horizontal, vertical and ROPS vertical load cases of performance testing and the corresponding lab for investigation. The test results show that the design can meet the requirements of ISO3471 ROPS: 2008. Test results differences and simulation and welded joint of the fracture analysis on the reason.
Active Control of Sound Transmission Trough a Double Wall Structure
Authors: Mao Qi Bo
Published: November 2011

Based on coupling structural-acoustic modal model, using piezoelectric materials and loudspeaker/microphones as actuator/sensors, the analytical simulations are presented for the actively controlled the sound transmission through double plate structure. Firstly, the results show the potential for using PVDF sensors to improve sound transmission loss. Secondly, the effects of parameters of actuator/sensor and double plate structure on control performances are discussed. And some useful conclusions are obtained, for example, if volume velocity sensor is applied to radiating plate, transmission loss will improve significantly, no matter what type actuators (i.e. loudspeakers or PZT actuators on either plate) are used; symmetrical rectangular PVDF sensors should be applied on radiating plate; using loudspeaker/microphone configuration should be avoided for the same thickness double plate structure; the increased thickness of cavity leads to the better control performance.
Numerical Simulation on the Infrared Radiation Characteristics of Ejector Nozzle Based on RMCM
Authors: Chen Li Hai , Yang Qing Zhen , Cui Jin Hui
Published: November 2011

Based on the numerical calculation of three-dimension flow field of the exhaust system, a code is developed by the reverse Monte-Carlo method (RMCM) to simulate the infrared radiation characteristics of the aeroengine exhaust system and the plume. A ray-tracing method (RTM) is introduced to seek the meshes of the flow field which the ray travels through to avoid the trouble of interpolation. The infrared radiation characteristics of a certain turbo-fan engine’s ejector nozzle in the waveband of 3-5μm is simulated at non-afterburning condition. The results of the simulation show that : (1)Because of the introduction of the secondary flow, the average temperature of the ejector nozzle’s core plume is 20K lower than the baseline one’s.(2) The infrared intensity for the ejector nozzle is most reduced relatively by 44.5% in comparison with the baseline nozzle along lateral direction.(3) The ejector nozzle has a better performance of infrared stealth.
Production of Microbial Oils Fermented by Two-Strains with Corn Stalk
Authors: Li Xin She , Lu Bu Shi , Jiang Hua Rong
Published: November 2011

The corn stalk was fermented by Cellulomonas flavigena to produce reducing sugar, then the production was re-fermented by Trichosporon cutaneum to produce microbial oils. The best process conditions were obtained by orthogonal test through measuring the content of reducing sugar and microbial oils in product. The results show that the reducing sugar content of the corn stalk fermented by Cellulomonas flavigena is 5.720mg/mL under the inoculum of Cellulomonas flavigena of 5 % at 31°C for 3 d . The microbial oils content of the corn stalk re-fermented by Trichosporon cutaneum is 1.27g per 100g fermentation products under the inoculum of Trichosporon cutaneum of 11 % at 28°C for 7d . There is a certain feasibility to produce microbial oil fermented by Cellulomonas flavigena and Trichosporon cutaneum with corn straws. The research provides a new way for utilization of corn stalk and also provides a new method for development of microbial oils.
Study on Fluidization Characteristics of Chinese Herbal Medicine Waste in a Fluidized Bed Reactor
Authors: Mi Tie , Yu Xin Ming
Published: November 2011

Large amounts of Chinese herbal medicine wastes (CHMW) are produced in the process of processing and manufacturing traditional Chinese crude medicines. For CHMW, gasification in fluidized bed is a promising option. But, it is the difficult to fluidize CHMW particles alone in fluidized bed gasifier, especially for various size and shape of CHMW particles. It is very common to fluidize these kinds of biomass particles with sand, gives better defined fluidization behavior and a more reliable scale-up. However, not much is known about fluidization behavior of CHMW particles in fluidized bed. Therefore, a fluidized bed and its air distribution were designed and set up, the experimental study on fluidization characteristic of CHMW was done in the fluidize bed. Minimum fluidization velocity and the effect of bed height of CHMW/quartz sand mixtures on fluidization properties in air have been experimentally determined. The results showed that good fluidized could achieve with the additional of quartz sand. The results will be in favorite design and operation of CHMW gasification in fluidized bed.
Experimental Study on Pollution Emissions of the DLN Combustor
Authors: Li Xu , Liu Kai
Published: November 2011

Experimental study of combustor of heavy-duty gas turbine (E) which is the first independent intellectual property rights has been finished on high-pressure test system by China Gas Turbine Establishment of AVIVI. The content of CO and UHC are very low, the combustion is stable and efficient, the combustion efficiency is over 99%; pollution emissions (NOx) are 225mg/m3 (15%O2) under rated condition, which is not meet the design requirements. The results indicated: The radio of on-watch-fuel is large, which makes the content of NOx is large; uneven premixed fuel is another important reason that makes the content of NOx is large. The conclusion has provided the reliable basis for gas turbine’s design and development.
Effects of AOC and Phosphorus on Bacterial Growth under Oligotrophic Condition (2)
Authors: Jiang Deng Ling , Zhang Yu Min , Ni Guo Wei
Published: November 2011

The effects of phosphorus and organic carbon on bacterial growth were investigated in the laboratory. The bacteria sampled from the drinking water network of Tianjin were inoculated into water samples with different content of phosphorus (0～15µg PO43--P/L) and assimilable organic carbon (10～200µgAOC/L). The inoculated water samples were incubated at 20°C. Bacterial growth was monitored in every 2 days in the beginning of cultivation and in every 4 days or more in the later of the cultivation. Results showed that Phosphorus had obvious promotion on bacterial growth, which included shortening the lag phase evidently, increasing the growth rate and the maximum cell count in stationary phase. Carbon can only increase bacterial number. Under oligotrophic condition，when ratio of AOC: P in nutrients of water was more than 100:5, phosphorus was the limiting factor of bacterial growth. The bacterial yield factors against phosphorus and AOC were 1.1×109CFU/µgP and 9.0×107CFU/µgAOC respectively. Phosphorus was more sensitive than AOC. When the phosphorus concentration was less than 0.7µg/L in water samples, it was very difficult for bacteria to obtain phosphorus, and then growth of bacteria was very slowly or in lag phase in the first nine days of incubation time. In drinking water with low concentration of phosphorus (<0.7µg/L) and disinfectants, bacterial regrowth may be controlled. The paper will be Narrated in two parts, “Effects of AOC and Phosphorus on Bacterial Growth under Oligotrophic Condition (1)” and “Effects of AOC and Phosphorus on Bacterial Growth under Oligotrophic Condition (2)”.
Automatic Acquisition of the Four-Chamber View of Heart from Dual Source CT Data
Authors: Du Aan , Song Wei , Yang Xin , Xue Hai Hong , Sun Kun
Published: November 2011

The four-chamber view of heart plays an important role in clinical diagnosis of cardiac disease. According to the geometric structure of heart, we propose a method to automatic acquisition of the four-chamber view in volume data. First, the contrast-medium enhanced part of dual source CT data is segmented and morphological operations are applied. Second, the Dijkstra Algorithm considering 3D Euler Distance as weighting factor is introduced to extract the center line of atrium and ventricle. Finally, the four-chamber view of heart is estimated based on the 3D Euclidean Distance and the geometric characteristics of the center line. In this paper, 40 patients (age from 49 to 81) are examined, and the recognition rate is 91.25%.
Expression of KiSS-1 in Epithelial Ovarian Cancer and its Role in Metastasis
Authors: Zhu Wei Pei , Gao Ai Hua , Chen Xin , Li Feng , Jiang Nan , Zhang Hong
Published: November 2011

Objectives To study expression of KiSS-1 and its role in migration and invasion of ovarian cancer (OC). Methods Expression of KiSS-1 was detected in tissue of 46 cases of OC and 17 cases of benign ovarian neoplasm by immunohistochemistry examination. Human OC cell line HO8910 was transfected by pcDNA3-KiSS-1 vector. The cell proliferation and invasion properties were detected by RT-RCR, MTT, clone formation rate and Boyden Chamber invasion assay. Results (1) Immunostaining showed that expression of KiSS-1protein was significantly higher in OC than that in benign ovarian tumor (P<0.05). (2) KiSS-1 expression was significantly higher in cases of advanced stage and with lymphatic metastasis (P<0.05). KiSS-1 expression was significantly lower in clear cell cancer compared with other histologic types (P<0.05). (3)KiSS-1 gene was successfully integrated into the genomic DNA of ovarian cancer cell line HO8910. Boyden Chamber invasion assay revealed that the number of cells invading through the Matrigel filter was significantly decreased in the transfected group compared with the non-transfected. No differences were observed in cell proliferation between the two groups. Conclusion There was over expression of KiSS-1 in OC compared with that in benign ovarian tumor. The KiSS-1 gene could suppress HO8910 invasion in vitro. To elucidate the contradiction effects of metastasis suppressor genes KiSS-1in vivoandin vitroneeds deeper research.
Modelling and Simulation Radial and Tangential Dipoles of Human Head Local Field Potentials
Authors: Zhou Zhi Zun , Ding Jing , Yang Yan Fang
Published: November 2011

The mathematical tangential and radial dipole models were constructed. Dipoles can be use to answer if any special electrical and magnetic patterns exist in human head, and also use them to reveal many other magic phenomena of head nero-system. Construct of a mathematical models of the electric potentials. Use validation of the mathematical model and interrogation of the validated model to determine what sort of dipole separation would produce patterns. Our models were simulated by using MATLAB. Simulation clearly show that those tangential and radial dipole models reflected real dipoles physical and electrical characteristic of them. Those models show that even with spatial filtering, the electrode array can not be more than 4.5 mm above the surface of the cortex for the sorts of patterns we are looking for to be resolved.
Neural Respiratory Drive during CO2 Rebreathing Assessed by a Combined Esophageal Electrode Catheter
Authors: Tan Kang Xin , Lu Dong Xiao , Luo Yuan Ming
Published: November 2011

Assessment of neural respiratory drive is useful for diagnosis and management of breathing difficulty. The diaphragm is the most important muscle of respiration, therefore its electrical activity during spontaneously breathing could be used to reflect neural respiratory drive. In this study a catheter which was composed of 10 electrodes and two balloons was developed and was used to assess neural respiratory drive during CO2rebreathing in six healthy subjects. There was a good linear relationship between diaphragm EMG and end-tidal CO2(r = 0.98±0.01) during CO2rebreathing. Transdiaphragmatic pressure was also well correlated with end-tidal CO2during CO2rebreathing. We concluded that the combined catheter developed in this study can be used to assess neural respiratory drive.
Screening Method for Real-Time Detection of Influenza-A Virus in Human Throat Swabs by Surface Plasmon Resonance Biosensor
Authors: Teng Juan , Gu Da Yong , Xu Yun Qing , Shi Lei , Li Wen , Liu Chun Xiao , Zhao Chun Zhong , Yang Yan Qiu
Published: November 2011

A surface plasmon resonance (SPR) biosensor was applied to detect influenza-A virus in human. The detection scheme was based on the measurement of SPR response unit resulting from the hybridization of biotinylated DNA probe immobilized on the SPR chip modified with streptavidin and the product of polymerase chain reaction reversed from the influenza-A virus RNA segment (AB514942). The prepared biosensor demonstrated optimum performance in 200 mM phosphate buffered saline (PBS) with a pH value of 7.5 and exhibited good sensitivity with a detection limit of 0.5 pM for perfect complementary hybridization. In addition, the prepared biosensor can effectively discriminate perfect complementary and other three types of mismatch: base substitute, base insertion and base deletion in 200 mM phosphate buffered saline (PBS) with a pH value of 7.5. Furthermore, the influenza-A virus in throat swab samples was directly (without RNA extraction, and amplification) detected with the prepared machine, and the result showed that the SPR response unit was in response to the dilution factor of throat swabs. Better sensitivity and specificity based on Surface Plasmon Resonance biosensor were obtained which demonstrated a promising potentiality in detecting influenza-A virus
Effect of High Intensity Pulsed Electric Fields on Antioxidant Substances of Postharvest Ginger
Authors: Han Yu Zhu , Song Shu Yao
Published: November 2011

The antioxidant substances of ginger are extremely easy to degrade in the process of store and its quality and economic value are also degraded. The effects of high intensity pulsed electric field (HIPEF) treatment on the SOD, POD, PPO, Vc, total flavonoid, polysaccharide were studied. The results show that 0.8kV/cm for 5min treatment of HIPEF can maintain the cell membrane integrity, restrain the relative electric conductivity, maintain the high water content and the content of antioxidant substances, enhance the SOD and POD activity, restrain the PPO activity and the degradation of Vc , total flavonoids and polysaccharide, and inhibit the enzymatic browning of ginger to some extent, so that the quality of postharvest ginger during storage are kept well and more long time.
Optimization of Extraction Process of Lycopene from Watermelon (Citrullus lanatus) by Response Surface Methodology
Authors: Shi Xian Feng , Xu Yuan , Li Yu Hua , Zeng Hong Xia , Sun Yu Hong
Published: November 2011

The extraction processing of lycopene from watermelon was investigated in this paper. Based on single factor experiments, response surface methodology (RSM) was adopted to study the key parameters such as number of extraction, extraction temperature, extraction time in order to increase extraction rate of lycopene. A second order quadratic equation was established and the applicability of model and interaction involved factors on predicting the lycopene extracting content was verified. The results indicated that the optimum extraction conditions were hexane (containing 2% dichloromethane) as extraction solvent, ratio of solvent to raw material of 3:1 (mL/g), number of extraction of 2, extraction time of 1.9 h and extraction temperature of 29.8°C. Under these conditions the extracting content of lycopene was 14.71±0.22 mg/kg, which is well in agreement with value predicted by the model.
Study on the Antioxidation of Lac Dye
Authors: Zhang Hong , Fang Gui Gan , Zheng Hua , Guo Yuan Heng , Li Kun
Published: November 2011

To investigate the in vitro antioxidation and antimicrobial activity of the lac dye, in this study, three free radicals DPPH·, ABTS+and O2ˉ· are used as the test objects to evaluate the free radial scavenging ability of the lac dye by comparing the absorbance change of free radical solution under specific wavelength. The results showed that, the lac dye has scavenging activity on DPPH· and ABTS+, but has no scavenging activity on O2ˉ·; when the lac dye reached a certain concentration, its scavenging rate on DPPH· and ABTS+can be as high as 68% and 87% respectively, with the antioxidant activity respectively 0.20 times and 3.42 times of that of the ascorbic acid, indicating that the lac dye is a kind of natural pigment of a certain scavenging activity on free radicals.
Study on the Antioxidative Activity of Enzymatic Hydrolysates of Defatted Soybean Meal
Authors: Xu Jing , Jiang Lian Zhou , Li Yang , Wang Jin Ling
Published: November 2011

Defatted soybean meal was hydrolyzed by Alcalase in research. Anti-linoleic acid peroxidation capacity was chosen as the response values. Then the optimal technique was established through a systemic research on the influencing factors, including enzymolysis temperature, time, proteases concentration and substrate concentration, etc. Results showed that the defatted soybean meal could be effectively hydrolyzed by the alkali protease Alacase2.4 L, and the optimal technique conditions were temperature 55°C, time 3h, pH 8.0, proteases concentration 19,200U per gram substrate, and substrate concentration 8%. The anti-linoleic acid peroxidation capacity of enzymatic hydrolysates could be 34.16%, with the hydrolyte degree of 35.0 %.
Dynamic Modeling of CNC High Precision Surface Grinding Machine with Horizontal Spindle and Rotary Table MGK7350
Authors: Lin Xian Xiang , Weng Ze Yu , Lu Bo , Yang Tuo , Ding Hong Gang
Published: November 2011

The dynamic model of machine tool structure is the basic of its dynamic analysis and dynamic optimization. The determination of joint interface stiffness and damping of grinding machine structures is one of key problems to dynamic analysis of machine tools. A method to identify interface dynamic parameters of grinding machine structures using measured transfer function data and optimization technique is presented in this paper. Finally, do the whole machine modal analysis with method and finite element method, contrast the experimental and theoretical results, proved this finite element model can stimulate the dynamic performance of the whole machine effectively, it is of practical value of engineering application.
An Effective Method for Determining Finite Element Model Parameters of Rotor Elastic Support System
Authors: Wang Yong Xing , Yan Jiang , Wang Sheng Ze
Published: November 2011

A finite element model of the elastic support rotor system based on the corresponding experimental model was established. According to the principle of two types of model with an equal first order critical speed, the equivalent stiffness and damping of a rolling ball bearing support system with rubber rings determined by experiment were transferred into the finite element model. Then, the dynamic behavior of rotor systems with symmetric and asymmetric structure, different support system stiffness and support span were calculated and analyzed respectively. At last, the influence of the rotor structural parameters on the equivalent stiffness of elastic bearing support system obtained by experiment was pointed out.
An Interface Design of Communication between PC104 and DSP Based on Dual-Port RAM
Authors: Li Bo , Liu Qing Jian , Qiao Zhi Feng , Dong Jing Chuan , Liu Qing
Published: November 2011

This paper focus on a motion control card based on DSP, designed an interface communication between DSP and industrial PC. After a contrast about several methods of communication, this interface take the Dual-port RAM as the final way. This communication method regard the DRAM as the sharing storage unit, use the semaphores of the DRAM chip to prevent visiting the same address at same time on boths port and achieve the high speed communication between DSP and PC104.
Development of an Ontology-Based and STEP-Compliant Intelligent CNC System
Authors: Li Peng , Hu Tian Liang , Zhang Cheng Rui
Published: November 2011

STEP-NC (ISO 14649) is a newly developed and feature-based machine tool control language for CNC controller. In contrast with conventional G&M code (ISO 6983), this new data model could almost transmit all the designing and planning information for machining parts through CAD&CAPP&CAM to CNC. However, STEP-NC is feasible but not enough to support some intelligent actions such as self-planning, self-learning, decision-making, etc. A complete and well-structured knowledge base is urgently needed to be established to support CNC intelligence. The main work of this paper is focused on two fields: i) An extraction, presentation and utilization mechanism for ontology-based machining knowledge is implemented. ii) A novel framework for STEP-Compliant and knowledge-base supported intelligent CNC controller is proposed.
Conceptual Design of Hybrid-Driven Precision Press
Authors: Li Yong Gang , Yan Bing
Published: November 2011

In this paper, a novel precision press is proposed, which is to combine the motion of a large constant speed motor with a small servomotor via a two-DOF mechanism, where, the constant speed motor provides main torque and motion requirements, while the servomotor contributes to modulations on this motion. The forward kinematic optimal design, electromechanical system dynamics modeling and simulation of this new mechanical press system have been presented here. The simple analysis of theoretical feasibility of the hybrid-driven press is investigated.
Error Analysis and Calibration of Gyro-Stabilized Platform for Electro-Optical Pointing System
Authors: Zhou Xiao Yao , Lu Ya Fei , Zhang Zhi Yong , Fan Da Peng
Published: November 2011

A novel method in the solution of the pointing problem for electro-optical pointing system (EOPS) is presented in this paper. Firstly, the error sources are analyzed in detail. And then, a linear model whose parameters have definitely physical meaning is developed to improve pointing accuracy. Extensive experiments have been carried out and the results show that the system errors can be eliminated by the model effectively and the pointing accuracy of the azimuth and elevation axes have been improved from 0.4541º and 0.2959º to 0.038º and 0.031º respectively.
Modeling and Simulation of Aircraft on Ground Deicing Process Based on Thermal Balance
Authors: Chen Bin , Wang Li Wen
Published: November 2011

The deicing process and practical model of aircraft on ground were introduced, and the thermal consume was discussed. Deicing model of the aircraft on ground was founded based on thermal balance. The simulation results indicated that the proposed model was effective to analyze the aircraft on ground deicing process.
Signal Feature Extraction about the Oil Whirl and Oil Oscillation Based on EMD
Authors: Xu Bao Jie , Liu Ran
Published: November 2011

The article discusses the EMD and adaptive time-frequency analysis method based on EMD, and explains the characteristics about oil whirl, oil oscillation. Apply EMD and Hilbert-Huang t transformation to extract characteristics, which verifies applying EMD into feature extraction is effective.
Low-Frequency Shaking of the Construction Machine Cab and Design of Vibration Isolators for Protecting
Authors: Sun Xiao Juan , Zhang Jian Run
Published: November 2011

Focusing on low-frequency shaking of the construction machine cab, the article analyzes reasons of the shaking and shows several improved isolator designs to reduce the effect of shaking on drivers’ comfort. Firstly according to previous 4 modes below 26 Hz from the finite element analysis of an excavator cab with 6 cab mounts, reasons for low-frequency shaking are analyzed. Then two improved measures of isolator designs for keeping the shaking small effectively are considered. Static analysis on one silicone-oil-sealed-type rubber mount, which can improve drivers’ comfort effectively according to practical application, is done. Besides, perfect setting approaches of isolators can greatly alleviate the cab shaking, which is confirmed by finite element modal analysis of the excavator cab, the first natural frequency of cab increased to 15.55Hz from 6.91Hz.
The Comparison of Acoustic Emission with Vibration for Fault Diagnosis of the Bearing
Authors: Feng Xiao Liang , Wang Guo Feng , Qin Xu Da , Liu Chang
Published: November 2011

The fault diagnosis of rolling bearing plays a significant role in rotating machinery. This paper makes a comparison between the acoustic emission and vibration signal in the fault diagnosis of the bearing of outer race pitting. The acoustic emission and vibration signal are processed by the wavelet transform, Hilbert envelope transform and FFT transform. Finally, the spectrum charts of the signals of acoustic emission and vibration are drew out. Based on the analysis results, the conclusion can be drawn that acoustic emission is superior to vibration in the fault diagnosis of the bearing.
Research on Ride Comfort of Off-Road Vehicles
Authors: Xia Jun Zhong , Ma Zong Po , Li Shu Min , An Xiang Bi
Published: November 2011

This paper focuses on the ride comfort of off-road vehicles, which requires rising steadily. The objective methods for determining ride comfort including the Average Absorbed Power, BS 6841, VDI 2057 and ISO 2631 were investigated. Research shows that all the methods can be used to specify and evaluate ride comfort, but the Average Absorbed Power is more suitable for off-road vehicles. The solutions to improve ride comfort of off-road vehicles in suspension and seat were investigated too.
Technology of Magnetic Flux Leakage Signal Detection Based on Scale Transformation Stochastic Resonance
Authors: Peng Yong Sheng , Leng Yong Gang , Wan Jian
Published: November 2011

The conception and realization of scale transformation stochastic resonance (STSR) are proposed, which are used to deal with problem of weak signal detection with large parameters that can not be resolved by traditional bistable system based on stochastic resonance. Magnetic flux leakage (MFL) signals inspection for oil well tubing defects is easily destroyed by noise. In order to detect weak MFL signals effectively, the proposed STSR technology is applied to the inspection. The result shows that the STSR technology has the potential application in engineering practice.
Strain Sensing Behaviour of PPy-Coated XLA Fibers
Authors: Xue Pu , Wang J.P. , Tao Xiao Ming
Published: November 2011

This study developed an electrically conductive XLA fiber, which can sense strain variation under extension. The conductive XLA fiber was prepared by chemical vapor deposition (CVD) after plasma surface treatment. The strain sensing behavior of the PPy-coated XLA fibers was studied under tensile loading. It is found that the sensitivity of XLA fiber bases is over 145, and its working range is from 10% to 110%, showing it excellent in strain sensing behavior.
Calculation for Equivalent Nodal Force of Prestress in 20 Nodes Isoparametric Element
Authors: Yang Hao , Li Na , Xu Bing Shuang
Published: November 2011

When establishing the prestressed bridge model with the entity unit, the simulation of prestress bar has very big limitation. The paper takes 20 nodes isoparametric element as an example and puts forward a kind of numerical method combined with the Newton iterative algorithm and Gauss integral algorithm to calculate equivalent loads of prestress in body element. This method can be used to calculate the equivalent loads of prestress in the various complex steel in bundle shapes and suits the computer programming. Through the final regular inspection, this method has been proved to have very high precision.
The Connection Properties of Rubber Asphalt Waterproofing Adhesive Layer in Bridge Deck Pavement
Authors: Li Yun Liang , Tan Yi Qiu
Published: November 2011

The use of rubber asphalt pavement as a bridge deck waterproofing adhesive layer material, the use of shear test and pull-out test analysis of the adhesive layer of rubber bitumen adhesive properties. The best rubber asphalt spraying volume has been tested, and the stress - deformation of rubber asphalt waterproofing adhesive layer has been obtained. Studies have shown that rubber asphalt has good deformation ability, suitable for bridge deck waterproofing adhesive layer materials.
Research on the Fracture Mechanism of Coal with Three Collinear Cracks Filling with Gas
Authors: Jin Wen Cheng , Zhu Zhe Ming , Hu Zhe Yuan
Published: November 2011

Coal usually contains many cracks which affect the stability of mining zone. In order to research the fracture mechanism of cracked coal, a special case of three collinear cracks filling with gas is considered. A set of complex stress functions which satisfy all the required conditions are first derived, based on Muskelishvili’s results. The least square boundary collocation method is used to enforce the external boundaries approximately, and the stress intensity factors (SIF) can then be computed according to the related formulae. The value of SIFs for different crack orientations, different crack distance under different loading are calculated. The results shows that the most unfavorable crack orientation is in the 45° angle and the confining stress and the distance between cracks have a considerable effect on the SIF value.
The High Resolution Lunar Planet DEM Based on the Altimetry Data of 400-Circle CE-1 Laser Altimeter (2B)
Authors: Chen Jian Ping , Liu Hong Li , Guo Min
Published: November 2011

Recent years, considering the decreasing amount of nature resource on Earth, It’s very important to expand the field of scientific research, and to develop new resources. Based on 400 rail CE-1 laser altimeter altimetry data (2B data), to process the data, delete the singular of data, and import the remaining data into ERDAS IMAGINE9.1 generating lunar planet DEM. Its spatial resolution is more accurate than the existing model of the lunar DEM.
Gear Fault Diagnoise Based on Ensemble Empirical Mode Decomposition and Instantaneous Energy Density Spectrum
Authors: Lu Jin Ming , Meng Fan Lin , Shen Hua , Ding Li Bing , Bao Su Nin
Published: November 2011

A very short impulse energy called ‘impulsion energy’ can be produced when the gear meshing with gear pitting fault and excited the resonance of the structure. The common techniques have inconvenience to deal with this vibration signal. A new fault diagnosis method based on EEMD and instantaneous energy density spectrum is proposed here. The IMFs generated by EEMD can alleviate the problem of mode mixing and approach the reality IMFs. The characteristic frequencies were found in the instantaneous energy density of Hilbert spectrum. The effectiveness of this method was demonstrated by analysis the vibration signals of a gear with pitting fault.
Impact Analysis of Ultrahigh Pressure Treatment Pesticide Residues in Vegetables on near Infrared Spectroscopy Detection
Authors: Xu Ze Min , Sun Yu Jing
Published: November 2011

In order to simplify the process of detecting pesticide residues in vegetables, reducing detection time to find a more efficient detection method, ultrahigh pressure processing technique was applied to NIR detection experiments on dimethoate residues in Chinese cabbage, the spectral data was pre-processed and optimized and a spectrum model was established. The results show that: ultrahigh-pressure extraction process did not affect the absorption of near infrared spectroscopy of extraction reagent acetone. A PLS model on near-infrared spectroscopy of samples within the range of 4100-11000cm-1 was established, obtaining a correlation coefficient R of 87.14%, Rank of 9 and RMSECV of 0.139. Residual concentration of 10-4-10-5 has a small relative error, the prediction is better. Further processing and selection of samples will expand the range of predicted concentration.
Investigation of Solidification Characteristics of Resin for Integral Stereolithography System
Authors: Xu Guang Shen , Yang Gen , Gong Jing , Yang Jian
Published: November 2011

Photo-curable resin’s solidification under beam exposure in integral stereolithography (SL) is a dynamic process. Firstly, the up-part in photo-curable resin solidifies after absorbing enough energy; and then with the beam exposure, after the beam penetrates the solidified resin, the liquid resin under solidified resin have the opportunity to be cured. But the model which describes the solidification characteristics for photo-curable resin in SL process does not reflect the dynamic characteristics, and obvious predicting error will be introduced. In this paper, a solidification characteristics model of the photo-curable resin UV-2230, which describes the resin’s dynamic characteristics in solidifying process, is established with least square method in experiments. By using the model, critical exposure of the resin, penetration depth of the liquid resin and penetration depth of the solid resin are obtained. The research provides a base for improving the building accuracy for integral SL system.
The Design and Realization of Automation Stamping Machine System
Authors: Yan Liang Wen , Li Teng Fei , Li Wen , Zhao Li Na
Published: November 2011

In order to sign correctly, quickly and clearly, an automation stamping machine is designed and manufactured. This paper mainly introduces principle of the system, including whole architecture, motion control system, mechanical system and software realization method. The running result shows that the system is reliable and easy to be operated and that it realizes the intended functions of stamping automatically.
Microstructure and Properties of Zirconia-Mullite Nanocomposites Obtained from Si-Al-Zr-O Amorphous Bulks Doped with CaO and MgO
Authors: Tan Xiao Ping , Liang Shu Quan , Chai Li Yuan
Published: November 2011

Zirconia-mullite nanocomoposites were prepared from Si-Al-Zr-O amorphous bulk with diffrent content of CaO and MgO by two-step thermal treatment between 900 and 1200°C. The effects of the additives on the phase and microsturcture were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results show that the addition of CaO promotes cristobalite phase formation and the anisotropic growth of mullite grains. An indention micro-crack method was used to measure the fracture toughness of zirconia-mullite nanocomoposites. The results demonstrate that the fracture toughness increases with higher concentration of CaO. The improvement of fracture toughness is attributed to the anisotropic growth of grains.
Design of Automatic Assembly Tire Machine
Authors: Yang Zhi Yong , Li Hui
Published: November 2011

This system realizes the function of automatic tire assembly which not only took PLC as control center but also synthetically applied with converter, servomotor and hydraulic. Firstly, it completes the carry of tire with converter by the way of different frequency. Secondly, PLC is used to control servomotor to finish assembling of tire. Thirdly, exact position control is designed through the use of the electro hydraulic servo control. Farther more, mathematics model is established. At the end of this paper, we compare machine efficiency with the manual operation and present the application foreground of this system.
Oxhydroelectric Effect: Electricity from Water by Twin Electrodes
Authors: Germano Roberto , Tontodonato Valentino , Hison Cornelia , Cirillo Domenico , Tuccinardi F.P.
Published: November 2011

Electricity extraction from water by twin electrodes, mediated by oxygen molecules, that we call Oxhydroelectric Effect, is reported. The extremely simple components of this experimental system are: two platinum (Pt) wire electrodes, a saturated solution of potassium carbonate (K2CO3) in water (H2O) (with pH >10) as electrolyte, and a film of hydrophilic material (Nafion®). A dc power of the order of hundredths of nW was measured for days through a resistor connected to the twin Pt electrodes. The addition of a very small amount of hydrogen peroxide (H2O2) to the electrolyte (water-potassium carbonate solution with only 0.004% H2O2), as a source of oxygen, determines an immediate dc power jump, more than two orders of magnitude high, lasting for days. The Oxhydroelectric Effect opens the way to a completely new paradigm in what concern low-cost electrical energy generating systems, with a tremendously wide range of possible applications.
Water Plasma Modes and Nuclear Transmutations on the Metallic Cathode of a Plasma Discharge Electrolytic Cell
Authors: Cirillo D. , del Giudice Emilio , Germano Roberto , Sivasubrammanian S. , Srivastava Yogendra N. , Tontodonato V. , Vitiello G. , Widom Allan
Published: November 2011

In the conceptual framework of Quantum ElectroDynamics (QED) it has been proventhat liquid water is made up of two phases : 1) a coherent phase where the electron cloud of watermolecules oscillates in phase with a trapped electromagnetic field within extended regions, calledCoherence Domains (CD); 2) a non coherent phase formed by a gas-like ensemble of molecules fillingthe interstices among the CD's. The constituentmolecules of the coherent phase oscillate between theirindividual ground state and an excited state where one electron is so loosely bound to be consideredquasi-free. Therefore the coherent phase contains a plasma of quasi-free electrons. In the bulk water,as in the case of superfluid liquid Helium, each molecule crosses over continuously between the twophases. On the contrary, close to the surface of a metallic cathode in a chemical cell , the attractionbetween molecules and wall stabilizes the coherent phases so that the layer of interfacial water ismainly coherent and capable of holding a negative electronic charge. When the chemical cell voltageexceeds a threshold, an i! nterfacial water- cathode metal surface plasma mode is developed. Fromthe collective energies continuously pumped into the plasma, the weak interaction e + p+ → n + νemay be induced which produces neutrons and neutrinos from Hydrogen atoms. The neutrons may thenultimately induce other nuclear transmutations on the cathode metal surface.
Study of Thermal Behavior of Porcelain Insulators with the Finite Element Method
Authors: Lerantzis P. I. , Tsarabaris P.T. , Theodorou N. J.
Published: November 2011

In order to study the thermal behavior of the distribution line porcelain insulators when the line’s conductor current is high, a laboratory condition in a simulation program (ANSYS) was created considering the structure and geometry of porcelain insulator based on finite element analysis and working out distribution maps of temperature changes. The numerical results obtained using analytical models are in accordance with data resulting from laboratory tests carried out for this purpose. Remarkable temperature rise was not observed at insulators in spite of the high conductor temperature.
Building the Interactive Relationship between the Top Management and the External Project Manager: The Communication Plan in Laboratory Research
Authors: Markaki Evangelia N. , Sakas Damianos P. , Chadjipantelis Theodoros
Published: November 2011

The aim of this paper is to develop a communication management plan concerning the implementation of a project with external expert as the team leader collaborating with the top management in laboratory research (hi-technological, financial, societal, political). The challenge of the paper is to combine through the communication process aspect the external project manager’s challenges with the interests and the expectations of the top organizational management of a hi-technological laboratory.
Outsourcing in the Field of Information Technology in Maritime Companies
Authors: Vaxevanou Anthi Z. , Konstantopoulos Nikolaos , Sakas Damianos P.
Published: November 2011

This study aims to examine the application of the outsourcing concept [1], in the field of information systems in maritime companies. With the contribution of personal experience and knowledge of the authors, but also the extensive qualitative research that was carried out, one of the areas of activity of a maritime company outsourced to external collaborators is that of information systems. The lightning-fast pace at which technology and information systems are advancing, has forced maritime companies to outsource the information technology sector to external collaborators, who have the knowledge and the resources.