bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation of Flotation Circuit for Kakoxene Ore Processing
Authors: Zhang Yue Jun , Tan Ming , Wu Tao , Feng Tian Ran
Published: July 2013

A group of data from a batch flotation tests were plug into a batch flotation model, and mineral floatability parameters (flotation rate constant, mass fraction of floatability component) were derived from model calculation. Then a flotation circuit of kakoxene ore was designed in JKSimFloat simulator, after inputting those floatability parameters to flotation circuit model, the ultimate grade and recovery of apatite was obtained by analog computation. Meanwhile, the same flotation circuit test was achieved in the laboratory. The apatite grade in concentrate is 66.61% at the recovery of 78.35% by simulation, while apatite grade in concentrate is 72.70% at the recovery of 88.14% in the laboratory tests. Compared with experiment data, the accuracy of simulation is acceptable.
Synthesis, Characterization and Ring-Opening Polymerization of Macrocyclic Aryl Ketone Oligomers Containing the Phthaloyl Moiety
Authors: Hu Li Song , Guo Qing Zhong
Published: July 2013

Preparation of macrocyclic aryl ketone oligomers containing the phthaloyl moiety by Friedel-Crafts acylation reaction is described. Detailed structural characterization of these oligomers confirmed the cyclic nature by a combination of MALDI-TOF-MS and GPC analyses. The cyclic aryl ketone oligomers are amorphous and readily undergo anionic ring-opening polymerization in the melt by using potassium 4, 4-biphenoxide as the initiator, producing linear, high molecular weight poly (ether ketone) s with excellent thermal stability.
Graft Polymerization of Acrylic Acid onto Polypropylene Film: Immobilization of Chitosan Nanoparticles onto Grafted Films
Authors: Zheng Hua Ming , Cai Yang , Zhang Min , Li Hou Bin
Published: July 2013

In this paper the aim is to immobilize chitosan nanoparticles on the surface of the polypropylene film, aqueous phase thermal decomposition characteristics of ammonium persulfate is used. The PP film is first hydroxylation pretreated in the protection of the high-purity nitrogen. And then ceric ammonium nitrate acting as an initiator, induce graft polymerization of acrylic acid on the hydroxylated treated PP film. Thus, carboxyl functional groups are grafted on the surface of PP film. Finally chitason namoparticles are fixed on PP film by the reaction of carboxyl group and the amino group of chitosan. Experimental results show that: when the reaction temperature is 60 ° C, the concentration of acrylic acid is 8% (w/w), the reaction time reaches 4h, the concentration of ceric ammonium nitrate is 2mM, the optimum grafting ratio is obtained, which is up to 0.6008×10-7mol/cm2. Total reflection Fourier transform infrared spectroscopy absorption peaks appear at 1712cm-1, indicating that the-COOH has been successfully grafted to the film surface; the SEM scanning the film surface shows that the chitosan nanoparticles were perfectly immobilized on the modified film. Key words: Acrylic acid, Polypropylene film, Chitosan nanoparticles, Graft polymerization
Laser Cladding Functionally Graded Composition of Molybdenum Disilicide and Co-Based Alloy
Authors: Zhang Jian Bin , Yu Dong Mei , Liang Ze Fen , Fan Ding
Published: July 2013

An approach for fabricating functionally graded specimens of Co-based alloy and molybdenum disilicide (MoSi2) compositions via Selective Laser Cladding (SLD) is presented. The focus aimed at using the functionally graded material (FGM) concept to gradually grade powdered compositions of MoSi2 within a base material of Co-based alloy. A high power CO2 laser was used to process the material compositions to a high density with gradual but discrete changes between layered compositions. The graded specimens initially consisted of 100% Co-based alloy with subsequent layers containing increased volume compositions of MoSi2 (0-80wt.%). Specimens were examined for porosity, phase composition and microstructure. It was found that crack sensitivity of layer can be reduced by adding Co-based alloy into the pure MoSi2 powder.
GLC Coating Improving the Wear Resistance of Aeroengine Bearings in Insufficient Lubrication
Authors: He Guang Yu , Zhu Xiao Dong , He Wei Feng , Chai Yan
Published: July 2013

Traditional lubrication by oil sometimes does not work because of the high temperature, fast speed and excessive load of the aeroengine bearings. The Graphite-like Carbon coating is used to improve the insufficient lubrication in this paper. And the micro hardness, the friction coefficient and the wear rate tests are offered: with GLC, the hardness is increased twice at least, its friction coefficient is 25% and the wear rate is 1/100 when contrasted with that of the typical bearings material. The tests and calculation results show:the wear cycles of the GLC coated W9Cr4V is more than 400 times of that of the uncoated W9Cr4V and even when the GLC coating is worn out, the friction coefficient of W9Cr4V is only 0.15 which can effectively lubricate for the bearing for a short period of time when the liquid lubrication does not work. So it is proved to be effective in improving the wear resistance and reliability of bearings.
Study on Structure and Property of 1560 Nickel Alloy Produced by Electromagnetic Horizontal Continuous Casting
Authors: Zhang Qin , Cao Zhuo , Li Ying , Cui Jian Zhong
Published: July 2013

Using electromagnetic horizontal continuous casting method, A trial was carried out on producing (Φ54mm) 1560 nickel-based alloy round ingot. Examinations are also proceed on properties of a series of 1560 alloy wires and rods that made from the ingot by further rolling and drawing. The results show that the central area of ingot produced by electromagnetic horizontal casting is composed of uniform equiaxed grains, Some casting defects that usually occur in conventional horizontal continuous casting , such as central crackshrinkage cavity and porosity are restrained. Meanwhile, the segregation of solutes was reduced significantly. This technique shorten the conventional production process by eliminating annealingforging and sanding operation, which can greatly enhance the production yield.
Experimental Study of the Performance of C60 Pavement Concrete
Authors: Du Xue Yan , Li Zheng , Shao Bo
Published: July 2013

Abstract: In order to improve the surface standard of the mine heavy vehicle road, on the basis of laboratory studying in C60 concrete, the performance of the C60concrete in pavement construction will be researched, and frost resistance, carbonation resistance and creep performance variation were analyzed. The results showed that mixed with silicon powder and slag powder, under the condition of lower amount of cement，The test of C60 pavement concrete structural compactness，mechanical properties and durability indicators could satisfy the design requirements；As the number of freeze-thaw cycles went up, the rate of strength loss and mass loss of the test pavement concrete increased linearly；The carbonized value increased significantly, in 7 days; growthed significantly slowed in the range of 7 days -28 days; The creep strain value increased linearly during the period of 100 days, changes leveling off after more than 100 days of age, and creep strain values stabilized.
Comparative Study on Wear of Hot-Working Die Steels
Authors: Zhang Qiu Yang , Wang Shu Qi , Wang Lan
Published: July 2013

The wear behavior and wear mechanism of hot-working die steels H13 and H21 were studied using a pin-on-disc high-temperature wear machine. H21 steel presented higher wear resistance than H13 steel at 25 and 400°C. However the wear rate of H21 steel increased rapidly and was substantially higher than that of H13 steel under a load of 150 N or above at 200°C. Tribo-oxide layer possessing protective effect generated at 200 °C for H13 steel, but appeared at 400 °C for H21 steel with obviously lower amount than that of H13 steel due to relatively high alloy contents. Higher wear resistance of H21 steel is attributed to the undissolved carbides and high thermal strength.
First-Principles Calculations of Electronic and Structural Properties of LaN under High Pressure
Authors: Yang Xiao Cui , Liu Fang , Luo Xiang Yi , Lin Hong Yu , Xiao Jun Ping
Published: July 2013

An investigation on the electronic structures and structural stability of LaN under high pressure has been conducted using first-principles calculations based on density functional theory (DFT). At elevated pressures LaN is predicted to undergo a structural phase transition from NaCl-type to CsCl-type structure. The predicted transition pressure is 65 GPa. The result of elastic constants indicates that the NaCl-type structure is mechanically a stable structure and the CsCl-type strcture is not mechanically a stable one. The calculated band structure of LaN is semimetallic.the conduction and valence bands.
Light Power Enhancement of Violet LEDs Using AlGaN-Based Epitaxial Structure
Authors: Yue Jin Shun , Gao Ying , Zhang Guo Hua , Liu Yi
Published: July 2013

The growths of AlN and AlGaN materials were carried out in a home-built metal organic chemical vapor deposition (MOCVD) system. The AlN template was characterized by X-ray diffraction (XRD) and it showed the full width at half magnitude (FWHM) of the x-ray (002) scan rocking curve was only 28 arc seconds, while the FWHM of (102) plane was 252 arc seconds. The results suggested a high quality epitaxial material was obtained. Subsequently, an AlGaN-based violet LED was designed on this template by using AlGaN material as the base. The Al composition of electronic blocking layer (EBL) was optimized. By a quick on-wafer electroluminescence (EL) test, it was demonstrated that the output light intensity of the new structure was at least 15% stronger in comparison to that of the traditional GaN-based violet LED. Finally, fully packaged LEDs were fabricated and the luminous power of the new structure was measured by Spherical integrated system. It was confirmed that a 43% increase of the output power can be obtained.
Effect of Welding Heat Input on Grain Size and Microstructure of 316L Stainless Steel Welded Joint
Authors: Li Li Chan , Chai Meng Yu , Li Yong Quan , Bai Wen Jie , Duan Quan
Published: July 2013

Influences of heat input on the microstructure and grain size of shielded metal arc welded 316L stainless steel joints were studied. Three heat input combinations were selected from the operating window of the shielded metal arc welding process and welded joints made using these combinations were subjected to microstructural evaluations so as to analyze the effect of thermal arc energy on the microstructure and grain size of these joints. The results of this investigation indicate that the microstructure of the weld zone and the fusion zone are austenite and a small amount of ferrite while the microstructure of the heat affected zone (HAZ) are austenite and a small amount of MC type carbides, and it can be seen that the amount of ferrite in the weld zone decreases with heat input. For the joints investigated in this study, the average grain size in the HAZ increases with heat input.
The Optimization of EDM Machining Parameters of Graphite Electrode on BP Neural Network
Authors: Wu Yun Xia , Wang Cheng Yong
Published: July 2013

This paper proposed a machining parameters optimization system of graphite electrode in EDM, which is established on BP neural network. Because BP neural network can approximate any continuous function by random accuracy, it is extensively used in processing technology, for example, the evaluation of the processing parameters, the optimization of machining parameters and processing error prediction, and processing technology effects are eventually predicted. The experiment results show that our system can reflect processing rule of EDM machine tool, and it can successfully predict material remove rate, electrode wear and surface roughness.
Investigation on Acoustic Emission Characteristics from Q345R during Fatigue Crack Propagation
Authors: Chai Meng Yu , Li Li Chan , Li Yong Quan , Bai Wen Jie , Duan Quan
Published: July 2013

The fatigue crack propagation process of specimen made from Q345R was monitored by acoustic emission (AE) equipment. The AE characteristic of the specimen generated during the fatigue crack propagation was obtained by parameter analysis method and wavelet transform method .The results show that the fatigue crack growth curve comprises four phases of the crack generation phase, the low-speed crack propagation phase, the high-speed crack propagation phase and the fracture phase, and the variation of signal parameters presents the similar tendency to the fatigue crack growth rate. The values of signal parameters, such as count, energy, and amplitude, are stable and low in the crack generation phase and low-speed crack propagation phase, and relatively unstable and high in the high-speed crack propagation phase and fracture phase. The type of signals is burst emission and the frequency ranges from 100kHz to 180kHz. From these correlations, it may be possible to predict the remaining service life of a pressure vessel from the results of short-term AE monitoring of crack propagation.
Research of Classification Technology of Cashew Nuts
Authors: Zhang Lin , Zhang Qi Zhi , Yi Chang Qin
Published: July 2013

Cashew classification technology is tested by the method of orthogonal test in this paper, and it found the main factors, the trend and the optimum operating parameters of cashew classification by observing three factors of the sieve length, drum speed and the number of turns which influenced mixed-level rate and classification efficiency. We did regression analysis of test data by using SPSS software, and got the universal formula of cashews samples grading for cashews samples. The paper provided theoretical basis for the structural design and optimization of the operating parameters of the cashew grading machine.
Study on Spare Part Requirement Prediction Model of Aircraft Battle Damage Assessment and Repair Based on Layer Analysis Method
Authors: Yao Wu Wen , Cai Kai Long , Zhou Ping , Li Yan
Published: July 2013

The necessity and actuality of spare part requirement prediction on aircraft battle damage assessment and repair were analysised. The calculation models, such as the quantity of the battle damage aircraft, the battle damage number of aircraft component, the equipment of aircraft battle damage assessment and repair, were set up. They could provide the reference and basis for constituting the advance project of aircraft battle damage assessment and repair and for repair guarantee.
Analysis of Failure Mode and Construction Improvement of Spray Tubes in Boiler Desuperheater
Authors: Chen Zhong Bing , Chi Ming Sheng , Zheng Li Feng , Shen Ji Xiong , Lei Heng Hai
Published: July 2013

With macrographic examination, SEM observation and fracture quantitative analysis technology, the fracture fractography of a spray tube with both the mechanical stress and the thermal stress in a boiler desuperheater of a power plant was interpreted, and the failure mode and the cause were researched. Results showed that rupture of the spray tube was due to the fatigue, and further, the thermal mechanical fatigue. The alternating bending stress and thermal stress were main factors of the fracture failure. The shallow surface thermal fatigue cracks in tube inner wall were induced by thermal stress. When the thermal mechanical fatigue crack grew up steadily to the shallow surface cracks zone, fast growth occurred and the local fast fracture zone generated which had different fractographies with final fast fracture zone of the normal fatigue fracture.
Numerical Analysis of the Performance of Dual-Tank with Movable Baffle for Heat Pump Water Heater
Authors: Yang Li Zhong , Wu Jie , Hu Ya Cai , Hong Rong Hua
Published: July 2013

The design of a new type of water tank for heat pump water heater is proposed. A movable baffle is set in the cylindrical water tank to prevent the mixture of hot and cold water in order to enable more hot water available for utilizing. The COP of the heat pump cycle increased due to the decrease of initial heating temperature, thus energy is saved. By numerical calculation, the performance of the new design is significantly better than previous water tanks. Comparing with the floating plate tank and common natural stratification tank, in the condition of water leaking 3% and Chrome-nickel steel wall, the available hot water efficiency of dual-tank with movable baffle is 40% and 50% higher and the energy consumption 12.3% and 13.9% lower. Moreover, little water leaking could increase the available hot water.
Design and Implementation of FOG Based Gyrocompass
Authors: Abbas Aqeel
Published: July 2013

A novel design of gyrocompass consisting of a single axis Fiber Optic Gyroscope (FOG) and a Theodolite is proposed to meet the requirements of low-cost, fast and high-precision. This algorithm uses FOG data and theodolite encoder feedback to determine Azimuth. Micro computer based software is also discussed which was developed for implementation of this scheme; finally test results and plots are briefly presented which proves effectiveness of the designed methodology. By this design an accuracy of 0.08ois achieved in approximately 5 min time.
Unilateral Gripping Mechanism Effectors
Authors: Hajduk Mikuláš , Šidlovská Ľuboslava , Tuleja Peter
Published: July 2013

In thetechnical practice it is impossible to use conventional methods of gripping, i.e. to clamp the manipulated object while handling it. The use of the end gripping effector mechanism with unilateral gripping offers a certain solution. This article gives an overview of unilateral gripping’s possibilities in connection with applied physical principle of used gripping element. The article also provides a methodological framework for selecting an appropriate option for gripping for a particular application.
Static and Dynamic Stiffness of the Mechatronic Position Servo Systems
Authors: Pandilov Zoran , Dukovski Vladimir
Published: July 2013

In this paper a model for the mechatronic position servo system with disturbance forces is presented. Static and dynamic stiffness for the proposed model is analyzed. An equation for analytical calculation of the static stiffness is developed. Correctness of the proposed equation is experimentally verified. Simulation of the influence of some parameters on the static and dynamic mechatronic position servo system stiffness is performed with simulation program MATLAB & SIMULINK.
Software Modules for Command and Control of the Anthropomorphic Gripper for Robots
Authors: Staretu Ionel , Itu Alexandru , Moldovan Constantin Catalin
Published: July 2013

This paper presents two software modules of the general structure and implementation features of the original software for command and control of the anthropomorphic gripper for robots. The software has three modules: RoboVISION, RoboSIM and RoboCOMMANDER. RoboVISION is a software module for tracing, visualization, shape recognition, measurement, and efficiency evaluation for 3D model generation of objects to grip by an anthropomorphic gripper. It was presented in another paper. This paper discribes RoboSIM nad Robo COMMANDER. RoboSIM product is an advanced software module that aims primarily to reduce achievement time of functional simulation of anthropomorphic grippers. RoboCOMMANDER is a software module for controlling a three-fingered anthropomorphic robotic hand in both virtual and real environments. The approach is using a multimodal interface based on voice commands, remote manipulation, and smart, remote controlling mobile devices.
Considerations Regarding PWM Characteristics for Accurate Motor Control
Authors: Mihai Niculae , Maximilian Nicolae
Published: July 2013

Since technology moved beyond micro, the accurate motor control became a challenge. Improvements were made at the level of each component of the motor controlling loop, but limitations still exist. The presented paper is focused on pulse width modulation, the most used method of conversion the computed digital signal into the analog voltage needed to excite the coils, in order to emphasize where limitations have to be overcome. In the end, some recommendations are made for improving the performances of the control loop.
On the Choice of Shape Functions of Unsymmetrical Elastic Rotors
Authors: Parzer Herbert , Gattringer Hubert , Hubinger Stefan
Published: July 2013

In this paper the effects of rotordynamics under the aspect of the choice of shape functions are discussed. For this purpose a rotor system which consists of a slim shaft and two rigid disks is modeled using theProjection Equation. The shaft is assumed as an elasticEuler-Bernoullibeam, supported by two bearings modeled as radial spring systems. The rotor is driven by a permanent-magnet synchronous motor whose torque is transmitted with a spur gear pair next to one of the bearings. ARitzapproach is used to separate the elastic displacements in position and time, thereby different shape functions are evaluated. Approximated eigenfunctions are computed and used as shape functions as well. For validation, the eigenfrequencies are compared with semi-analytical ones, calculated with theTransfer-Matrix-Methodand experimental results. The insights obtained from this work should make it easier to choose the appropriate shape functions for such problems.
Reentry Design Solution for a Hypersonic Small Capsule
Authors: Rugescu Radu Dan
Published: July 2013

Restriction and selection criteria of inertial guidance sensors and system for a small recoverable capsule from onboard a hypersonic, atmospheric reentering rocket vehicle have attracted a specific research on the reentry design and challenges, with emphasize on the overall cost reduction and an optimal balance between the performances and costs under the given exploitation constraints. A simplified method for attitude control is derived that shows an easy accommodation in the capsule, given its high mass constraints, and convenient applicability for the class of small payloads under investigation. The palled experiments and investigating methodology is shown, as the result of the ORVEAL contract research team of ADDA-Association Dedicated to Development in Astronautics research organization, under the sponsorship of Romanian UEFISCDI authority for scientific research.
Passivity Based Control of a Cart with Inverted Pendulum
Authors: Jörgl Matthias , Schlacher Kurt , Gattringer Hubert
Published: July 2013

This paper deals with passivity based control of a cart , which can moves on a skew plain. On the cart a non actuated pendulum is assembled. Therefore, the mechanical system is non-linear, one degree under actuated and instable. The equation of motion is derived by the method of Lagrange. The goal of the control strategy is to stabilize the cart and the upper position of the pendulum. The applied control strategy is called Interconnection Damping Assignment Passivity Based Control (IDA-PBC). This method allows a physical approach with a simple proof of stability having appropriate Lyapunov function on hand. The simple proof of stability is an advantage of this theory. However, the proof of stability is fulfilled, challenging partial differential equation have to be solved to get the control law. Measurements results are presented.
Vibration Behavior Analysis of Wire Rope Isolators Under Traction and Compression Load
Authors: Buzea Daniel , Iacob Adrian , Soimaru Cristian , Ungureanu Loredana
Published: July 2013

In this paper, based exclusively on measurements, is presented a study about the vibration behavior of wire rope isolators (WRI) used in a specific application of vibration attenuation of the exhaust line. The objective of this study was to make a comparative analysis between the vibration attenuation performances of these isolators subjected by the exhaust line to traction or compression load. The analysis results will help us find out which one of these mounting methods highlights best the isolators' vibration damping properties.
Study Concerning the Maximal Depth of a Rectangular Part Made from Tailor Welded Blanks
Authors: Albut Aurelian
Published: July 2013

The formability of tailor welded blanks is significantly reduced compared with the homogeneous blanks. One of the important factor that are behind this fact is the material property changes a sides the welding line that merge the base materials. The work presented in this paper deals with numerical simulation concerning forming of a rectangular shaped part made from tailored blanks (TWBs), having the welding line situated symmetrical with respect to the part geometry. Due to dissimilar base materials of the TWBs, it is difficult to predict the maximal depth of the formed part. The presented research is trying to determine the maximal depth of the TWBs part based on the maximal depth of the parts obtained from each base material partly. To simulate the forming process the academically version of the Dynaform 5.8.1 software have been used. The obtained results are presented in the final part of this paper work.
Probe-Radius Compensation of the Bevel Gears Tooth Surface Using 3D Measured Points
Authors: Faluvegi Erzsebet , Cristea Luciana
Published: July 2013

First of all, using the coordinate measuring machines 3D measured points are acquired. These machines are widely used in gear manufacturing industry but each of them handles the compensation problem in different ways. Thus, the aim of this paper is to compensate the measured data points on the tooth surface of bevel gears with the value of probe radius. This paper presents an option to solve the compensation with the value of probe radius and shows the steps, the methodology to implement this idea in practical use. There are used triangular meshes on the measured data points and determined the normal vector of each point detected on the tooth surface of the bevel gears.
Modeling and Simulation of Closed-Loop Counterbalancing Hydraulic Units for Heavy-Duty Machine-Tools
Authors: Prodan Dan , Balan Emilia , Bucuresteanu Anca , Motomancea Adrian
Published: July 2013

In the case of vertical travels of large masses it is necessary to have counterbalancing systems, besides the kinematic chain of feed/positioning. These systems have a positive influence on machine accuracy. The counterbalancing systems are mechanic or hydraulic. In some cases, hydraulic systems containing one cylinder and one or several accumulators in a theoretically closed-loop are used. This paper presents mathematical models and simulation programs for closed-loop counterbalance systems.
Morphing Wing Concept for Small UAV
Authors: Prisacariu Vasile , Boşcoianu Mircea , Cîrciu Ionică
Published: July 2013

The biological flight involves the movement of a wing (lift surface) in viscous medium and it generates lift and resistance for going forward through friction compared to Reynolds number. The morphing concept is generally based on optimizing the aerodynamic form during the mission so it can execute a maneuver flight. This article desires a short passage through the mathematical aspect in 2D of the morphing profile concept.
Correlations in Basketball Free Throw
Authors: Covaci Alexandra , Talaba Doru
Published: July 2013

The purpose of this study was to investigate the existence of correlations between the speed of various components of the hand and the speed of the ball. These correlations have an important role in the configuration of a virtual simulator used to train basketball free throws. Seven skilled basketball players participated in this study. We found that the speed of the ball is correlated with the speed of different hand elements depending on the basketball players throw style.
Coil Type Ultrasonic Motor for Vascular Endoscope
Authors: Toyama Shigeki
Published: July 2013

IVUS (Intravascular Ultrasound) is a useful medical device to observe the thrombus in blood vessels, and such a micro motor less than 1.0mm in outer diameter is desired to apply IVUS in narrow brain vessels. In our previous works, ultrasonic motor consisting of a wire coil type stator, a waveguide, a cylindrical rotor, an ultrasonic vibrator has been developed. This motor is rather easy to miniaturize because of its simple structure. However, this motor behavior is unstable rotate. To improve these problems, a foil type stator has been applied in stead of a wire coiled stator. An ultrasonic motor with 0.05mm thick foil type stator was manufactured and tested their performances. It was able to verify that this ultrasonic motor with a foil type stator has the right quality. So, simplified IVUS system using ultrasonic motor with a foil type stator was manufactured and tested their fundamental performances. In order to expand development of new application, ultrasonic motor with a shortened waveguide and ultrasonic motor integrated driving unit with a stator was developed.
Aspects Regarding Software Simulation of a Quadcopter Dynamics
Authors: Predoi Cristian , Coşereanu Liviu , Axente Corneliu , Suteu Daniel Ioan
Published: July 2013

The development of unmanned aircraft (UAV) capable of vertical takeoff and landing maneuver (VTOL) and hovering flight is an area of interest for the military and civilian research component. This paper focuses on a quadrotor type miniUAV, and proposes a solution to implement a mathematical model for a quadrotor used in a simulation environment Matlab (Simulink).
Robust Estimation for Optimal Guidance Laws
Authors: Stoica Adrian Mihail
Published: July 2013

The aim of the paper is to present an alternative filtering method for the Augmented Proportional Navigation Guidance (APNG). Two main aspects distinguish the proposed filtering technique with respect to the ones used in the existing APNG laws. The first is the fact that by contrast with the classical Kalman filtering, some state-dependent noises in the measurements are taken into account. The second aspect is the use of a mixed filter for models with state-dependent noise which combines the benefits of the and Kalman type filtering. The aim is to cover the situations when the unknown target meneuvers are generated both by stochastic or by deterministic exogenous inputs. A case study together with comparative analysis of the numerical results illustrate and validate the proposed approach.
Robust Stability Analysis in the Presence of Time-Varying Uncertainties and Time Delay
Authors: Pana Valentin , Stoica Adrian Mihail
Published: July 2013

The paper presents some robust stability conditions for systems affected by parametric uncertainties and time delay. The objective is to obtain a method allowing determining the admissible domain of the parametric uncertainties and the maximum value of the time delay that can be reached without destabilizing the system. The bounds of the parametric uncertain are obtained using the Small Gain Theorem. The norm-boundedness is studied using a version of the Bounded Real Lemma for time-delayed systems. Throughout the paper the theoretical developments are illustrated using a numerical example concerning the prediction of pilot induced oscillations (PIO).
Varistor Model Suitable for PSIM Circuit Simulations
Authors: Mihalache Cristinel , Nitu Smaranda , Ionescu Florin
Published: July 2013

A varistor equivalent electrical network generally used in CAD software is presented. Based on a PSPICE model already presented [5] a PSIM model valid in static regime was developed. Since correct parameter estimation is very important for a model valid in transient regimes, a more detailed varistor electrostatic capacity Cp determination for future model improvements is presented.
Solid-Liquid Two-Phase Flow Image Reconstruction in Microchannel Based on Tikhonov Regularization Method
Authors: Liu Yong Hong , Wang Na , Sun Hai Yan , Chen Wei
Published: July 2013

Electrical resistance tomography (ERT) has been used as an alternative technique to monitor two-phase flow because of its high temporal resolution for monitoring fast transient processes. However the image reconstruction image with ERT in microchannel suffers from poor quality because of the interference of contact resistance. This paper aims at the solid-liquid two phase flow visualization in the cross-sections of a novel microchannel based on the ERT technique. Preliminary experimental results reveal that ERT image reconstruction technique base on Agilent data acquisition system can effectively detect the particle distribution in the microchannel.
Adaptive Denoising Algorithms Based on Wavelet for Pool Underwater Image
Authors: Wang Yi , Lei Fei , Fu Guang Jie
Published: July 2013

Image denoising is an important step in image processing of pools intelligent life-saving system, adaptive denoising algorithms has based on wavelet in this paper. Firstly, the threshold value selection was discussed and then the effect of threshold functions on denoising result was evaluated. Finally, an improved adaptive nonlinear threshold function was put forward. Simulation results showing that the adaptive denoising algorithm designed in this paper can achieve higher PSNR value, and time cost can be satisfy the real-time demand of pool intelligent life-saving system simultaneously.
Wavelet Digital Watermarking Algorithm on the Basis of SVD Decomposition
Authors: Wang Ji Lin
Published: July 2013

Based on SVD decomposition, an digital watermarking algorithm with the method of wavelet transform is proposed. By means of singular value decomposition to realize blind extracting, the watermarking image is embedded into intermediate frequency sub bands of wavelet composition. Finally, applying normalized cross-correlation function (NC) and peak signal to noise ratio (PSNC), it has proved that this algorithm has better invisibility and robustness.
Local Patch Similarity Ranked Voxelwise STAPLE on Magnetic Resonance Image Hippocampus Segmentation
Authors: Li Yuan , Jia Fu Cang , Zhang Xiao Dong , Huang Cheng , Luo Huo Ling
Published: July 2013

The segmentation and labeling of sub-cortical structures of interest are important tasks for the assessment of morphometric features in quantitative magnetic resonance (MR) image analysis. Recently, multi-atlas segmentation methods with statistical fusion strategy have demonstrated high accuracy in hippocampus segmentation. While, most of the segmentations rarely consider spatially variant model and reserve all segmentations. In this study, we propose a novel local patch-based and ranking strategy for voxelwise atlas selection to extend the original Simultaneous Truth and Performance Level Estimation (STAPLE) algorithm. The local ranking strategy is based on the metric of normalized cross correlation (NCC). Unlike its predecessors, this method estimates the fusion of each voxel patch-by-patch and makes use of gray image features as a prior. Validation results on 33 pairs of hippocampus MR images show good performance on the segmentation of hippocampus.
A Spatial Measurement and Statistics Method to Forecast Ore Deposits
Authors: Bi Tian Ping , Sun Li Shuang , Bi Peng Feng
Published: July 2013

This study used spatial measurement and statistics methods to investigate spatial relationship between ore deposits and fractures in Liaoning province of China. Firstly, bivariate J function found that the ore deposits have a clustering trend around the fractures. Secondly, a conditional intensity formula for ore deposits based on Poisson process was used to model the ore deposits spatial dependence on the fractures, and the formula of model was fitted in statistics software called R. Finally, the fitted model was used to predict high intensity areas of buried ore deposits based on locations of visible fractures, which could be used to guide ore deposit exploration.
A Blind Watermarking Algorithm for Digital Image
Authors: Wang Jun Jie , Mo Qian , Mei Dong Xia , Li Su
Published: July 2013

Based on the method of SVD, a novel watermark algorithm is designed in this paper. Firstly, the SVD is performed on each segment of the original host image; Secondly, the watermark bits are formed by chaotic encrypting;Thirdly, the secret bits are embedded into the S component of the matrix by quantization; Lastly, the inverse SVD transformation is performed on each block and the watermarked image is constructed. The original host image is not required in the secret watermark recovery. Experimental results show that the watermarked image has transparent feature, and the quality of the recovered watermark is satisfying. The algorithm is strongly robust to many attacks, such as JPEG compression attack, Noise Interference and so on..
Remote Sensing Image Fusion of Worldview-2 Satellite Data
Authors: Cao Lei , Liu Jun , Liu Shu Guang
Published: July 2013

In view of the situation that most image fusion methods make spectral distortion more or less; this paper proposes a spatial projection method by introducing the Gaussian scale space theory. According to mechanism of the human visual system represented by the Gaussian scale space, the spatial details feature information are extracted from the original panchromatic (PAN) and multispectral (MS) images, then the feature differences are projected into the original MS image to obtain the fused image. The experimental results with WorldView-2 images show that the proposed method can improve the spatial resolution of the fused MS image effectively, while it can make little spectral distortion to the fused images so as to maintain the great majority spectral information.
The Improved Denoising Algorithms Base on Wavelet Transform for Night Image
Authors: Lei Fei , Zhang Ze
Published: July 2013

In order to effectively improve the imaging quality of the nighttime image, An improved wavelet threshold denoising algorithms which could make up the shortage of soft and hard threshold function was researched in this paper. The denoising effect is much better when the parameter e is adjusted to a certain value. The simulation result shows that the gaussian noise in the night image is removed effectively. The Pseudo-Gibbs, Ringing effects, the lack of details and edge blur were overcome obviously.
Fast Algorithms of Multi-Object Recognition and High Precision Localization for Pose Estimation
Authors: Zhang Ying Jin , Qin Shi Yin , Hu Xiao Hui
Published: July 2013

The recognition and localization of cooperative objects are very important for spacecraft pose estimation towards autonomous rendezvous and docking (RVD). In this paper, an adaptive threshold segmentation algorithm is proposed base on weighted maximum gray value for multi-object detection, and eight-neighborhood region growing is employed for multi-object recognition. In order to achieve high-accurate localization, a sub-pixel object positioning approach is put forward by combination bilinear interpolation with median filtering, which employs bilinear interpolation to calculate sub-pixel centroid for reducing algorithm systematic errors, and applies median filter to reduce random errors produced by image noises. The experimental results show that the proposed algorithms are feasible and effective with high positioning accuracy of 0.01 pixels, and have outstanding advantages of anti-disturbance and real-time performance, thus can satisfy the practical requirements in the visual measurement and pose estimation of cooperative objects for the RVD in space exploration.
A Model of Target Detection in Variegated Natural Scene Based on Visual Attention
Authors: Wang Zhan Feng , Su Hai Tao , Chen Hong Shu , Hu Zhi Yi , Wang Jie Liang
Published: July 2013

Less of edge and texture information existed in traditional visual attention model in target detection due to extract only the color, brightness, directional characteristics, as well as direct sum fusion rule ignoring the difference in each characteristic. A improved model is proposed by introduced the edge, texture and the weights in fusion rules in visual computing model. First of all, DOG is employed in extracting the edge information on the basis of obtained brightness feature with multi-scale pyramid using the ITTI visual computing model; the second, the non-linear classification is processing in the six parameters of the mean and standard deviation of the gray contrast, relativity and entropy based on the GLCM; finally, the fusion rule of global enhancement is employed for combination of multi-feature saliency maps. The comparison experimental results on variegated natural scene display, relative to the ITTI calculation model, there is more effective with the application of the model in this paper, the interested area and the order to shift the focus are more in line with the human visual perception, the ability of target detection is strengthening in variegated natural scene. Further shows that the proposed edge and texture features introduced in the primary visual features to be effective, the introduction of each feature significant weighting factor is reasonable in the feature map integration phase.
Research of Lossless Digital Watermarking Technology
Authors: Sun Jian Guo , Liang Kou , Xia Song Zhu
Published: July 2013

The digital map is an important and indispensable resource to the national strategic security and social economic development. At the present, needs to focus on resolving the utility question of digital vector map copyright protection technology, furthermore, the information hiding technology is the basic content of the research areas of the digital vector maps copyright protection. It is proposed a digital copyright protection scheme, based on the principle of unauthorized cannot resume, copyright embedding operation selection partly transform for the map content. Processing area determined by the spatial clustering analysis method that is based on grid density.
Prediction of Campus Fire Based on SVM
Authors: Zhu Su Bin , Zhu Hai Yan
Published: July 2013

According to fire protection safety system, such as students' dormitories, put forward a fire prediction method based on SVM to deduce the possibility and risk level, in which peoples behavior state is combined with static fire factors .Then, the simulation results are shown the method is effective.
Case Reuse Based on Fuzzy Reasoning – Adaption for Emergency Management
Authors: Huang Chao , Huang Quan Yi , Zhong Shao Bo , Chen Jian Guo
Published: July 2013

Emergency management is such a domain where experiential knowledge could be easily collected, and is quite suitable for the application of case based reasoning. However, in practice there are two problems limiting the effectiveness of CBR, the he incomplete information and changing situations. This paper proposed an approach based on fuzzy sets and text mining to solve those two problems, which contains four steps: a) represent the attributes with fuzzy sets, b) extract solution texts with text classification, c) establish connections of attributes and solutions with association rules, and d) adjust the solution with fuzzy reasoning. An example shows the adaption for emergency management and illustrates the improvement for CBR with the approach.
Intelligent Method for Process Quality Diagnosis and Improvement
Authors: Xu Wen Jie , Yao Jin
Published: July 2013

An intelligent quality diagnosis method for process quality diagnosis and improvement was proposed to find out influencing input parameters for output quality and then provide suggestion for quality engineering to adjust them to acquire high quality performance. The diagnosis method extends the traditional quality control and diagnosis method that only for the output quality of manufacturing process. It can detect the input parameters of the manufacturing process and provide sensitivities of input parameter for adjustment. BN-MTY method was applied to explain the reason of quality failure in T2 control chart and the root output quality indicators that aroused the process quality anomaly was located. The integrated method of neural network and sensitivity analysis was applied to get the weight and threshold value of neural cell in the forecasting network. his integrated quality diagnosis method can diagnose the input parameters and provide accurate sensitivities for quality improvement.
Affective-Cognitive Reward Model Based on Emotional Interactions
Authors: Yu Dong Mei
Published: July 2013

In this paper, author presents a new computational model where both the results of emotional interactions from the intrinsic emotion and recognition and the extrinsic environmental stimulation (another agent), the two parts play an important role in everyday life. We take a kind of six basic emotion states (happiness, surprise, anger, fear, sadness, disgust), and updates its state depending on its current emotional and cognitive state and meeting with another one in random environment. At last, we also design some experiments to verify the effects of affective cognitive algorithm. Those experimental results are accordance with the emotion principle of human being.
Parameters Selection and Optimization of Particle Swarm Optimization Algorithm Based on Molecular Force Model
Authors: Hao Hu , Hu Na , Xu Xing , Ying Wei Qin
Published: July 2013

Inspired by thermodynamics molecular system, the particle swarm optimization algorithm based on the molecular force model (MFMPSO) was proposed. Two parameters were introduced in the MFMPSO algorithm. In this paper, the orthogonal test design method is applied to optimize the parameter combinations of three levels and four factors, which include dl and dh, the population size and the iteration number. The experimental results prove that the population size and the iteration number have litter influence on the MFMPSO algorithm, however dl and dh play a key role and thus the MFMPSO algorithm has good search performance when dl and dh take the values respectively in a certain range which is related with the length of the longest diagonal in the search space.
Genetic Algorithms with Immigrants Scheme for Dynamic Optimization Problems
Authors: Wu Yan , Liu Xiao Xiong
Published: July 2013

In dynamic environments, it is difficult to track a changing optimal solution over time. Over the years, many approaches have been proposed to solve the problem with genetic algorithms. In this paper a new space-based immigrant scheme for genetic algorithms is proposed to solve dynamic optimization problems. In this scheme, the search space is divided into two subspaces using the elite of the previous generation and the range of variables. Then the immigrants are generated from both the subspaces and inserted into current population. The main idea of the approach is to increase the diversity more evenly and dispersed. Finally an experimental study on dynamic sphere function was carried out to compare the performance of several genetic algorithms. The experimental results show that the proposed algorithm is effective for the function with moving optimum and can adapt the dynamic environments rapidly.
A Combined Local Best Particle Swarm Optimization Algorithm
Authors: Lian Zhi Gang , Gao Ye Jun , Ji Chun Lei , Wang Xue Wu
Published: July 2013

This paper proposes a combined local best particle swarm optimization algorithm (CLBPSO) which combined with local optimum particle information. And it gives three ways of combination local information. Experimental results indicate that the CLBPSO algorithm improves the search performance on the benchmark functions significantly. On the basis of experimental results, we will also compare these three methods with each other to find the best one.
Multiple Kernel Feature Fusion Using Kernel Fisher Method
Authors: Yang Bo
Published: July 2013

Different from the existing multiple kernel methods which mainly work in implicit kernel space, we propose a novel multiple kernel method in empirical kernel mapping space. In empirical kernel mapping space, the combination of kernels can be treated as the weighted fusion of empirical kernel mapping samples. Based this fact, we developed a multiple kernel Fisher method to realize multiple kernel classification in empirical kernel mapping space. The experiments here illustrate that the proposed multiple kernel fisher method is feasible and effective.