bluuebunny/crossref_metadata_2025 huggingface dataset:
Recent Progress in Titanium Silicide Nanowires: Properties, Preparations and Applications
Authors: Du Jun , Liu Jiao , Fu Hua Qiang , Li Bu Hui , Wu Qi
Published: November 2013

The rapid development of nanotechnology has opened up multiple areas of application of titanium silicide nanowires including microscopic fields, sensor and catalyst areas and electrode materials, as well as their potential applications in nanodevices. The preparation of titanium silicide nanowires can be summarized as top-down method and bottom-up method. Its necessary to find some simple and quick ways to prepare titanium silicide nanowires with the desirable pattern. Recent advances in manipulating titanium silicide nanowires are discussed with a focus on the progress of nanowire preparations and applications.
Analysis of Losses and Thermal in Induction Motors
Authors: Ding Xiao Feng , Chang Hui
Published: November 2013

This paper presents an investigation into the losses and thermal characteristics of induction motors operated from pulse width-modulated (PWM) voltage supply in comparison to that operated from sinusoidal voltage supply. It was concluded that due to the abundant harmonics in the PWM waveforms, significant losses are induced in the motor by the inverter supply. The temperature ascends correspondingly. Experiments were conducted with no load and with load conditions. The losses and thermal characteristics were calculated using finite element analysis (FEA) and validated by the experiments.
Research on Optimal Design and Processing of High-Speed Ceramic Ball Bearings without Inner Rings
Authors: Li Song Hua , Feng Ming Hao , Wu Yu Hou
Published: November 2013

Under the background that modern machine tools have higher requirements to the spindle system, the accuracy, stiffness, critical speed and dynamic stability of the spindle bearing also put forward higher requirements. Traditional steel spindle has been difficult to meet the needs, because of its inherent characteristics. Advanced ceramics have excellent performance, such as low density, low thermal expansion coefficient, high stiffness, wear resistance and good chemical and thermal stability, which can meet the requirements of modern machine tool spindle to the performance of bearing material. The longest fatigue life is the objective function, the calculation method of the ceramic bearing optimal design is the external point method of penalty function, and the all-ceramic bearings without inner rings are successfully manufactured by the advanced manufacturing technology. Finally, the high-speed ceramic motorized spindle prototype was assembled with high precision successfully, and its performance test and analysis were finished, the results show that using the all-ceramic bearing can effectively improve the rotation accuracy and rotational stiffness of the spindle-bearing system.
Mechanical Behavior of Wedge Adjustment Bending Device of Cold Leveler
Authors: He An Rui , Xiang Nan
Published: November 2013

Roll bending plays an important role in elimination of non-uniform transverse internal stress and improvement quality of plate shape in leveling process. Taken the wedge adjustment bending device on a 11-roll cold leveler in a cross cut line as research object, in order to studying its bending characteristic, three-dimensional assembly model contained roll system, roller bending frame and upper beam has been built based on the finite element method. With the model, the necessity and function of the bending device has been verified. Different plate width, leveling force and roll bending value effects on working roll gap curve have been discussed. The result could serve as theoretical base for online set model and provide more precise parameters, accordingly maximize the potential ability of levelers.
Study on Failure Trend of Single Shear Hydraulic Lift Platform Structure on Basis of Static Strength Analysis
Authors: Sun Ying Shi , Ma Qian Hui , Xuan Liang
Published: November 2013

To ensure the safe use of single shear hydraulic lift platform for processing and manufacturing railway vehicles. This paper analyzes the use conditions of single shear hydraulic lift platform, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.
Design, Manufacturing and Performance Analysis of Spiral Coil Pump
Authors: Patil N.R. , Gaikwad S.R. , Navale R.A. , Sonawane D.S.
Published: November 2013

The Spiral Coil pump is a non-conventional water pump which can be powered by wind energy or flow energy of river water. It can also be hand driven. It is very useful especially in rural areas for farming and irrigation purposes. Spiral Coil pump comes under the category of a low to moderate lift pump. In the present study, the hand operated experimental setup is designed and constructed to analyze the performance of the spiral coil pump under different parameters. The parameters considered are submerged ratios, rotational speed, layers of coils. For setup of 0.8 m wheel diameter with 7 number of coils, the maximum head obtained is in between 4.3 m to 5 m with maximum discharge 1200 lit/hr for single layer and 2280 lit/hr for double layer of the coil with efficiency range 20% to 74%.
Study on Failure Trend of Lateral Lifting Platform Structure on Basis of Static Strength Analysis
Authors: Sun Ying Shi , Xuan Liang
Published: November 2013

To ensure the safe use of lateral lifting platform for processing and manufacturing railway vehicles. This paper analyzes the use conditions of lateral lifting platform, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.
Vibratory Movement of the Friable Material in the Conditions of Combined Vibrations of the Working Member
Authors: Zviadauri V. , Nadiradze T. , Chelidze M. , Tumanishvili G.
Published: November 2013

The reasons of occurrence of non-working fluctuations in the vibratory machine are considered. The mathematical model of movement of the loaded resonant vibratory feeder is worked out and by means of mathematical modelling is shown influence of spatial non-working fluctuations on the character of the vibratory movement of the material. It is shown, that the combination of some non-working fluctuations with working resonant fluctuations an increase of speed and intensity of movement of the material is reached which is a constructionally realizable problem.
Non-Standard Structure Design and Modal Analysis of Embedding Function Module of Tool Holder
Authors: Li Guang Hui , Hong Xu , Guo Lin Lin , Bo Wei , Tan Guang Yu
Published: November 2013

According to the structure and characteristics of the HSK-A63 tool holder, we design and retrofit the non-standard tool holder with special function module. Establish and assemble three-dimensional entity models of embedded temperature measuring tool holder, ER collet/nut and flat end mill with Pro/E 5.0. Based on the establishment of the reasonable boundary conditions and meshing of the tool holder assembly, natural frequency and vibration modes of the tool holder assembly are calculated by modal analysis with the Ansys Workbench. These analysis results are the important research basis for the dynamic characteristics designing and dynamic balance researching to the tool system.
Modal Properties of Hybrid Carbon/Kevlar Composite Thin Plate and Hollow Wing Model
Authors: Haidzir H. , Majid Dayang Laila , Rafie A.S.M. , Harmin M.Y.
Published: November 2013

In any flutter prediction analysis, modal testing is necessary because flutter, a resonant like vibration occurs at a flutter frequency and adopts a mode shape akin to its structural natural modes. Modal testing can be performed computationally with knowledge of the mechanical properties of the structure. In the present work, computational modal analysis is first performed on a cantilevered hybrid composite thin plate and validated experimentally. Then, the computational procedure is demonstrated on a composite hollow wing model of same material. The concept of hollow wing is explored due to the superior mechanical properties of carbon/kevlar composite plate. It is observed that the natural frequencies of the hollow wing model are higher than thin plate due to stiffer configuration. A breathing mode was also observed at mode 4 for the hollow wing.
Conceptual Aircraft Design Exploration through Functional Approach
Authors: Romli Fairuz I.
Published: November 2013

In today’s market, it is no longer sufficient to have better designs than the competition. In order to maximize the product’s market potential, it has to be rapidly produced and made available to the market. To reduce their time-to-market period, manufacturers need to shorten their design and development process. It becomes vital that the design architecture solution is derived faster, which can be handful for complex products like an aircraft with the current geometrical-based approaches due to the plethora of physical alternatives to be considered. On the other hand, the search for design architecture solution from functional requirements is theoretically more effective because functional space is comparatively smaller than physical search space. This allows the design efforts to be more focused and this subsequently saves time, efforts and resources. With this notion, there is a driving motivation to adapt functional approaches into the conceptual product design process in order to exploit some of its advertised benefits. In this paper, an example case study of an aircraft conceptual development is presented to highlight possible advantages of approaching architecture solutions from the functional space.
Identification of Modal Properties of Composite Thin Plate Using OMA in Wind Tunnel Environment
Authors: Saffry Z.A.C. , Majid Dayang Laila , Romli Fairuz Izzuddin , Mustapha Faizal , Abdullah Ermira Junita
Published: November 2013

Identification of modal parameters is crucial especially in aerospace applications whereby the interactions of airflow with aircraft structures can result in undesirable structural deformations. This structural deformation can be predicted with knowledge of the modal parameters. This can be achieved through conventional modal testing that requires a known excitation force in order to extract these dynamic properties. This technique can be experimentally complex because of the need for artificial excitation and it also does not represent actual operational condition. The current work presents part of research work that address the practical implementation of operational modal analysis (OMA) applied to a cantilevered hybrid composite plate exposed to low speed airflow in a wind tunnel. A single contactless sensing system via a laser vibrometer is employed to measure the response. OMA technique applied in a wind-on condition succeeded in extracting the modal parameters of the hybrid composite plate which correlate well with modal testing using impact hammer excitation.
Effect of Axial Gap between Diffuser Inlet and Impeller on Efficiency and Flow Pattern of Centrifugal Fans
Authors: Gholamian Mojtaba , Rao Gurram Krishna Mohan , Panitapu Bhramara
Published: November 2013

Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet exit and first section of impeller width. In this paper the effect of axial gap between inlet diffuser and impeller on performance and flow pattern is considered. Three diffuser inlet sizes with respect to impeller size (smaller, nearly same and bigger than inner impeller diameter) and three axial gaps within the available dimensions of the casing and impeller were chosen. Numerical simulations were performed to find the effect of this axial gap on flow pattern, performance and efficiency. From the simulation of each case study, flow pattern and its mechanism and the causes that affecting the efficiency and performance due to axial gap are analyzed and presented.
Nonintrusive Efficiency Estimation of Induction Motors Based on an Adaptive Extended Kalman Filter
Authors: Yu Hong Xia , Li Chuang
Published: November 2013

In this paper, a new nonintrusive efficiency estimation method without using stray loss approximation value was presented, the efficiency of induction motor was computed using estimated value of speed and load torque by AEKF. In AEKF, the speed and load torque as the state of system are estimated, the noise covariance matrices are estimated adaptively while the state of induction motor system are estimated to overcome the defect that estimation results are affected by the selected noise covariance matrices in EKF, then the estimated speed and the load torque are used to achieve noninvasive efficiency estimation. Experimental results demonstrate that the efficiency estimation results of this method has higher accuracy and are not affected by initial value of noises covariance matrices.
Design and Manufacturing of Absorber for Solar Desalination System
Authors: Sapre Mandar S. , Auti Abhijeet B. , Singh T.P.
Published: November 2013

In solar desalination system, solar energy is utilized for heating salt water using parabolic solar concentrator. The steam formed is then condensed to get the pure water. The water is kept in an absorber placed within the focal area of the concentrator. Optimal utilization of solar energy is possible by designing an absorber of proper size. Parabolic dish type concentrator is generally used for cooking but here we discuss its use in steam generation. Paper explains design and manufacturing of absorber and then comparing the results with conventional cooking vessel. Material of the absorber is selected considering the effects of seawater, the ability to resist high temperature, and manufacturability. Heat resistant coating is applied for maximum absorption of the radiation. Absorber designed as a thin walled pressure vessel is then manufactured by rolling, pressing and welding processes. Rate of evaporation of water in the designed absorber is compared with that in the conventional vessel for different sunshine conditions. It is observed that designed absorber is more efficient.
Control of PMSG Wind Energy Conversion System with TS Fuzzy State-Feedback Controller
Authors: Kaewpraek Nikorn , Assawinchaichote Wudhichai
Published: November 2013

This paper presents a Takagi-Sugeno (TS) fuzzy state-feedback controller based on a linear matrix inequality (LMI) approach for the permanent magnet synchronous generator of wind energy conversion system (PMSG-WECS). A dc/dc converter is considered to regulate the maximum power output of the system. To show its effectiveness, the dynamic model is replaced by the TS fuzzy model, which the proposed controller can be applied to the PMSG-WECS, while the controller gains can be obtained by solving set of a LMI approach. The proposed controller guarantees the stability of the system. Therefore, the performance of the proposed TS fuzzy state-feedback controller is assessed through the computer simulation.
Capacitance and Glass Transition Temperature of Nano Structured Alumina Polycarbonate Composites
Authors: Sudha L.K. , Sukumar Roy , Rao K. Uma
Published: November 2013

This paper describes how glass transition temperature (Tg) and capacitance (Cp) of a nanomodified composite polymer changes as compared to that of its base polymer. Because of its versatile applications, polycarbonate materials (grade PC1100 and PC1220 respectively), which are commercially available, were chosen as the base polymer in this study and nanostructured alumina material was used as filler for fabricating the desired composites by varying the filler weight in the composite materials. The Tg of the composites has been evaluated by differential scanning calorimetry (DSC) technique and Cp of the composites are derived from AC conductivity measurements of the composites. Results show that the Tg decreases as a function of filler load in the composite material whereas capacitance of the composites increase with the filler load in the composites. A filler concentration equal to or greater than 5 wt% in the said composites, the Tg of the composites reduces upto 15°C, whereas Cp shoots up in the pico-farad range with the same level of filler load, as compare to base polymers.
The Finite Element Analysis and Comparison of Wind Turbine Tower under Static Wind Load and Fluctuating Wind Load
Authors: Chen Chi , Chen Hao Yuan , Lu Tian
Published: November 2013

In this paper, a 1.5 MW wind turbine tower in Dali, Yunnan Province is used as the research object, using large-scale finite element software Ansys to carry on the dynamic analysis. These natural frequencies and natural vibration type of the first five of tower are obtained by modal analysis and are compared with natural frequency to determine whether the resonance occurs. Based on the modal analysis, the results of the transient dynamic analysis are obtained from the tower, which is loaded by the static wind load and fluctuating wind load in two different forms. By comparing the different results, it provides the basis for the dynamic design of wind turbine tower.
Performance Comparison between STATCOM and SVC to Enhance Power System Stability
Authors: Tran Thin Goat , Zha Xiao Ming , Giang Le Ngoc
Published: November 2013

This paper will discuss and demonstrate how FACTS controllers shunt Static Synchronous Compensator (STATCOM) and Static VAR Compensator (SVC) have successfully been applied to power system for effective regulating system voltage. One of the major reasons for installing a STATCOM or SVC is to improve dynamic voltage control and thus increase system load ability. In this paper a STATCOM and SVC are used to regulate voltage in a power system. When system voltage is low they generate reactive power (capacitive). When system voltage is high they absorb reactive power (inductive). In this paper comparison is also performed between SVC and STATCOM under fault condition and it is show that STATCOM have the ability to provide more capacitive power during a fault over SVC. All the simulations for the above work have been carried out using MATLAB/SIMULINK environment.
Fundamental Frequency Estimation in Power System through the Utilization of Sliding Window-LMS Method
Authors: Alhaj Hussam M.M. , Nor Nursyarizal Mohd , Asirvadam Vijanth S. , Abdullah M.F.
Published: November 2013

Frequency estimation is a vital tool for many power system applications such as load shedding, power system security assessment and power quality monitoring. Moreover, the complexity and noisiness of modern power system networks have created challenges for many power system applications. Fast and accurate frequency estimation in the presence of noise is a challenging task. Sliding window with the complex form of least mean square (LMS) algorithm has been utilized in this study in order to improve the frequency estimation in noisy power system. Different simulation cases have been examined for signal with different signal to noise ratio (SNR) and to evaluate the performance of sliding window method for better frequency estimation. The results obtained show that the sliding window method with LMS is able to improve and enhance the frequency estimation even when the (SNR) is small compared to the existing LMS method.
Research on Topology and Performance of Grid-Connected Inverter for Direct-Driven WGS
Authors: Chen Rong , Tian Jun Long
Published: November 2013

It is necessary that the grid-connected inverter was set up in wind generation system (WGS), in order to convey energy generated in WGS to the electrical grid. There are many sorts of inverters, but only two sorts of inverters suit wind generation system, which are current-source and voltage-source inverter, and only the latter is being widely used. The configuration, principle, control and characteristic of the two inverters were analyzed. Results have shown that, voltage-source grid-connected inverter has been the core of the commutation control configuration of direct-driven WGS, which is decided by the peculiarity of itself.
An Energy Integrated Solid Oxide Fuel Cell System: Modeling and Simulation
Authors: Wutthithanyawat Chananchai , Srisiriwat Nawadee
Published: November 2013

As a solid oxide fuel cell (SOFC) system is under dynamic development for a profitable use in the future, it is very important to understand its transient characteristics. In this paper, the modeling and simulation of an energy integrated SOFC system has been performed to analyze the dynamic characteristics of the heat integration. The lumped models of the energy integrated SOFC system are developed and simulated to present the results of open loop response of the temperatures of SOFC, steam reformer and air inlet stream. The simulation results showed that the air flowrate has a dominant effect on the temperature of SOFC while the valve position and the heater power supply noticeably affect the reformer temperature and air inlet temperature, respectively. Therefore, the match of major influence of input step change on the temperatures of SOFC, steam reformer and air inlet stream in the energy integrated system is very practical for an effective control strategy in the development of control system design.
Analysis on Commutation Failure and DC Differential Protection Unwanted Action of Yunnan-Guangdong UHVDC
Authors: Xie Hui Fan , Yang Guang Yuan , Peng Guang Qiang , Chen Xiao Peng , Chen Yan Zhou , Feng Dong , Wang Qi , Chen Yan Zhou
Published: November 2013

In order to reveal the commutation failure process and the reason for DC differential protection (87DCM) unwanted action of Yunnan-Guangdong UHVDC in 9.12th 2012, and to lessen the unnecessary outage and guarantee a safe and stable operation, the 9.12 outage is deeply studied, including commutation failure phenomena and equivalent circuit analysis, high voltage DC current, low voltage DC current and their differential current analysis and reason for 87DCM unwanted action, and the final conclusions come out that: (1) 9.12 commutation failure includes V1 failing to communicate to V3 of Y bridge and V2 failing to communicate to V4 of D bridge; (2) during commutation failure process, high voltage DC current and low voltage DC current all raise rapidly and both contain DC component, AC component and no-circle rising component, and theoretically high voltage DC current equals to low voltage DC current; (3) failure in low pass filter circuit of pole 1 low voltage CT leads to measuring differential current between high voltage and low voltage DC current, and finally leads to unwanted action of 87DCM.
A Criticality Assessment Method for Power Transmission Lines in Power System
Authors: Liu Wen Ying , Liang Cai
Published: November 2013

Analytic Hierarchy Process (AHP) is presented in this paper to measure the relative criticality for transmission lines, considering the changes of power system’s status about transmission lines overload, central buses voltage over-limit and transient stability. At first hierarchy structure is modeled, and then indexes of criteria Layer including transmission line overload index, central buses voltage over-limit index and transient stability index were presented. The simulation results show that, the AHP assessment method can give a full consideration to transmission lines’ function, which of huge significance for identifying critical lines and increasing the security of power system.
Performance Improvement of Dye Sensitized Solar Cell by Using Recycle Material for Counter Electrode
Authors: Gomesh Nair , Shafawi Mohammad , Irwanto Muhammad , Yusoff Mohd Irwan , Fitra Muhammad , Mariun Norman
Published: November 2013

This project is to investigate the counter electrode material from two different carbon sources to fabricate dye sensitized solar cell (DSSC). The carbon sources are extracted from battery and pencil lead. The method to prepare the DSSC is through the conventional Dr.Blading method. The same method is also used for the counter electrode which uses carbon from recycle batteries, the carbon from pencil lead are scribbled onto the ITO glass to get a uniform coating. Both thickness of the counter electrode vary accordingly. The solar cells are then placed under outdoor solar irradiation and the output is taken every 10 minutes. Based on observation, the solar cells which have the carbon from batteries shows higher cell efficiency which is 8.2 % with lower FF of 0.78, compared to by using the pencil lead, the cell efficiency is only 7.23% but with a higher FF of 0.93.
The Summary of HVDC Commutation Failure and Example Analysis
Authors: Wu Qian Jin , Wang Xue Zhi
Published: November 2013

Commutation Failure is the common fault of HVDC, continuous commutation failure may lead to HVDC block and affect the stability of the power system. Especially in southern power grid, china, its special that the end of four HVDC system are all in Guangzhou. If the AC system occurs serious fault, all of the HVDC system may occur commutation Failure, HVDC block, even occurs large area blackout. So how to avoid continuous commutation failure and restore the stability of HVDC is important for AC and DC parallel power system. This paper based on the mechanism of commutation failure, analyze the reason of commutation failure and identification method, preventive measures. At last, this paper uses actual recorded wave to analyze the diversification of system after commutation failure.
The Research of Hiding Technology of Hardware Trojan in Chip
Authors: Niu Xiao Peng , Li Qing Bao , Xie Xiao Dong
Published: November 2013

To solve the hiding problem of hardware Trojan in chip, we first analyzed the self-protection technology of malicious software, and then proposed a trigger mechanism that base on timing finite state machine (TFSM), energy flow, and distributed Trojan design method. As for the trigger mechanism that based on TFSM, one must enter the right pattern on the correct time to activate the Trojan. The mechanism based on energy flow can make the hardware Trojan keep hiding in the RTL code logical analysis. The distributed hardware Trojan design is to divide a complete Trojan into several components, and the Trojan will keep silent if all the components are not in order. The design methods of hardware Trojan have been verified in our self-made hardware threat simulate platform, it can reduce the rate of been detected out, and the possibility of been triggered out by random operations.
Development of Varied CMOS Ring Oscillator Topologies in 0.13-μm CMOS Technology
Authors: Zainol Murad Sohiful Anuar , Che Ismail Rizalafande , Mukhzeer Mohamad Shahimin , Mohd Fairus Ahmad , Rohana Sapawi
Published: November 2013

This paper presents varied CMOS ring oscillator topologies using Silterra 0.13-µm Process. Three topologies of ring oscillators have been designed which is the single-ended ring oscillator, differential ring oscillator and ring oscillator based variable resistor for 2.4 GHz wireless applications. The proposed designs consist of five stages delay cell. The simulation results show that a single-ended ring oscillator obtained the lowest power consumption of 0.41 mW, while differential oscillator achieves phase noise of −64.44 dBc/Hz at 1 MHz offset frequency. However, ring oscillator based variable resistor did not achieve any significant improvement. The proposed design is oscillates at 2.4 GHz.
Development of Release Film Automatic Adhesion Machine for Production of Flexible Printed Circuit Board
Authors: Chung Myung Jin , Cha Dong Hyuk
Published: November 2013

Industrial areas using FPCB are broadening from simple conection for bending of rigid PCB to main component of elecronic equipment. Fume is generated by melting of adhesion material during the hot press process for manufacturing of FPCB. Release film sheet is used for elemination of gas and absorption of shock in the hot press process. In this paper, release film automatic adhesion machine for hot press process is developed, and ultrasonic welding condition is proposed for optimization of adhesion strength between release films. The performance test of developed machine is conducted.
Design of Intelligent Concentrator Basing on M-Bus and Embedded Linux
Authors: Qi Shi Qing , Wen Ming Yang , Wu Zhao Xia
Published: November 2013

. Design an intelligent concentrator of heat meter reading system for residence and illustrate the principle of M-BUS communication. Develop the communication protocol of M-BUS between heat meter and intelligent concentrator. ARM9 processor is adopted to be the core of the hardware construction, the software of the concentrator adopted embedded Linux, modular hardware drivers and functional design are placed in this device. Develop the data receive circuit and data send circuit of M-BUS of concentrator and application program. M-BUS communication protocol is used to implement the data transmission between the concentrator and the heat meters. This device has the features of security data transmission, convenient reading and strong real-time.
Chromatic Confocal Displacement Measurment Based on Correlation Algorithm
Authors: Niu Chun Hui , Lv Yong
Published: November 2013

Chromatic confocal technique application in displacement measurement is studied theoretically and experimentally. a set of refractive lenses are designed and a measurement system is established. Correlation fitting method is proposed to fit spectrum curve and find peak wavelength. Results with use of correlation fitting method are compared with Gaussian and smoothing spline fitting methods. It indicate that correlation fitting method have higher extracting accuracy of peak wavelength and smaller RMSE of linear fitting due to narrower and smoother correlation curve.
Computerized Unripe and Ripe Durian Striking Sound Recognition Using Syllable-Based HMMs
Authors: Phoophuangpairoj Rong
Published: November 2013

Buying expensive agricultural produce and fruit such as durians that are unripe can result in a bad experience for a consumer and a loss in profit for a retailer. Therefore, the study of durian striking sounds to create an automatic method of recognizing the ripeness of durians without cutting or damaging them is interesting because it could benefit shoppers and the fruit industry. To solve the problem, the following method of recognizing unripe and ripe striking signals is proposed. First, in the recognition process, the spectral features of the signals are extracted. Then, acoustic models of durian striking sounds are created using syllable-based Hidden Markov Models (HMM). Finally, sequences of syllable-based unripe and ripe durians and defined possible durian ripeness results are applied to recognize the ripeness. Average ripeness recognition rates of more than 90.0% were achieved when using any number of strikes from one to five. When the number of strikes was limited to four and five, higher recognition rates of 95.0% and 92.0% were achieved for the untrained and unknown test sets, respectively. An average total recognition time of less than 80 milliseconds was taken to recognize the unripe and ripe durian striking sounds. The experimental results indicate that the proposed method is a time-efficient, accurate and effective way of recognizing durian ripeness.
Research on Key Algorithm of a New Generation Video Coding Standard HEVC
Authors: Wang Gang , Chen He Xin , Chen Mian Shu , Liu Yuan Yuan
Published: November 2013

The video coding standard of a new generation, high efficiency video coding ( HEVC ), is a video coding standard of JCT-VT under planning, mainly orienting toward high definition television （HDTV）and video coding system. From the start of the basic structure of HEVC, this paper not only introduces comprehensively the key HEVC technologies in intra-frame and inter-frame predictive estimation, orthogonal transformation, filter compensation and entropy coding but also points out the hot issues and the latest research direction.
The Analysis and Solution of a PLL Signal Source's Abnormity
Authors: Yang Yang , Hu Yuan Bin , Huang Wen Gang
Published: November 2013

In this paper, a kind of 120 kHz PLL signal source system is presented. Its based on the principle that changes in feedback voltage at a constant surge frequency which is related to reference voltage. At the same time, combine an actual test circumstance; the abnormity of signal lock is analyzed. Based the conclusion and the mode of interior parts, we take a simple adjust measure. The abnormity of the signal source is avoided availably.
The Electronic Band Structure and Vibrational Properties of Cubic BxIn1-xN Alloy
Authors: Omehe Nnamdi , Ojuh Divine
Published: November 2013

We have performed the electronic and phonon band structures of BxIn1-xN for various concentration of Boron using the pseudopotential method. The electronic band structure calculation was done using the GW approximation while the phonon band structure was done using the density functional perturbation theory. All calculations were done within the frame work of the density functional theory (DFT). From our calculations, the direct band gap for B0.25In0.75N, B0.5In0.5N and B0.75In0.25N were found to be 0.024eV, 2.2 eV and 6.01 eV respectively while the indirect band gap obtained were 0.59 eV, 3.24 eV and 6.9 eV. For the phonon calculations, it was also observed that an increase in the Boron content results in corresponding increase in the frequency of the topmost LO at the zone centre. For B0.25In0.75N, B0.5In0.5N and B0.75In0.25N, the topmost LO obtained were 735 cm-1, 885 cm-1 and 1105 cm-1 respectively. We also saw that as the Boron concentration decreases, the number of optical bands across which the acoustic bands overlap increases.
Thermal Entanglement and Dense Coding in Two-Qubit XX Spin Chain under an Arbitrary Magnetic Field
Authors: Huang Hai Lin , Sun Zhao Yu
Published: November 2013

The effect of arbitrary orientation in the magnetic field on the entanglement and dense coding of a two-qubit XX model is investigated. The concurrence and optimal dense coding capacity are calculated for different orientations of the magnetic field. It is found that the entanglement can be maximized by rotating the magnetic field to an optimal direction at given temperature. Furthermore, there exists critical concurrence Cc, beyond which the thermal state is unfeasible for optimal dense coding.
Modified CMFB Circuit with Enhanced Accuracy for Data Converter Application
Authors: Ahmad Mohd Fairus , Murad Sohiful Anuar Zainol , Shahimin Mukhzeer Mohamad , Rais Shamsul Amir Abdul , Hasan Ahmad Fariz
Published: November 2013

Enhanced feedback voltage of common mode feedback (CMFB) circuit is designed in this work for CMOS data sampling application using 0.18-μm Silterra process technology. The double error detecting point circuit is employed to associate with the feedback point in order to prevent the undesired voltage common mode at the output of operational transconductance amplifier (OTA). The PMOS input transistor for injecting the common mode voltage is used to fit in the limitation of voltage division in low power design. The feedback voltage is strongly pushed to have a stable value as to make the outputs of differential amplifier circuit swing at a nearly constant voltage at 1.2 V for enhancing accuracy of data converter.
Wireless Device Based on MEMS Sensors and Bluetooth Low Energy (LE/Smart) Technology for Diagnostics of Mechatronic Systems
Authors: Židek Kamil , Hošovský Alexander
Published: November 2013

This paper deals with usability of MEMS sensors for diagnostics of mechatronics system state wirelessly. We can acquire basic kinematics and dynamics mechanism parameters (spatial position, speed, acceleration, vibration, angular rate, orientation, etc.) and some environment condition (local/remote temperature, humidity, pressure, electromagnetic noise) by MEMS sensors. Acquired data are sent to remote application in desktop computer. This system can replace expensive and separate diagnostic tools by small integrated solution with one wireless communication interface (with limitation of MEMS sensors precision). This solution can be battery powered with long operation time, because there is used new wireless technology based on Bluetooth 4 protocol (Low Energy/Smart Bluetooth). Some of integrated MEMS sensors measures same variable on different measuring principle. For example angle can be acquired from three different sensors: magnetometer, accelerometer or gyroscope. Combination of these sensor data can significantly improve value accuracy. The designed diagnostic tool can serve as an inertia measuring unit IMU or Wireless IMU (WIMU).
Electro-Pneumatic Robot Actuator with Artificial Muscles and State Feedback
Authors: Tóthová Mária , Piteľ Ján , Mižáková Jana
Published: November 2013

Pneumatic position servo system with artificial muscles described in this paper represents feedback control system with non-linear compensation controller of state variables. The designed system demonstrates the operating characteristics that are significantly more favorable than the original characteristics without compensation and they are similar to the properties of the linear system. Such system has principally a shorter control time, significantly lower dynamic control error and it allows apply larger constants of the controller. Following an increased invariance of system against disturbances and also its parametric invariance (robustness) occur.
Operational Reliability of Mechatronic Equipment Based on Pneumatic Artificial Muscle
Authors: Straka Ľuboslav
Published: November 2013

The aim of the contribution is to describe reliability control in technical equipment with focus on maximizing overall system reliability by the means of optimal selection of basic elements or by proper redundancy of the elements. The contribution describes the possibilities of increasing the reliability of pneumatic artificial muscle by the means of passive reliability increase of its parts. Further, possibilities of reliability increase by the means of active and passive reserve are described, as a higher level of reliability control in technical systems. In conclusion, summary of particular ways of reliability increase is presented on a concrete example of artificial muscle.
Pneumatic Artificial Muscle as Actuator in Mechatronic System
Authors: Mižáková Jana , Piteľ Ján , Tóthová Mária
Published: November 2013

The paper describes basic characteristics of pneumatic artificial muscles (PAM) for using as actuator in mechatronic system. The previous parameters research of individually connected artificial muscles shows, that it is significantly nonlinear system with time delay.
Availing these results, problem of using of static and dynamic characteristics of PAMs for control and modeling electropneumatic mechatronic systems based on the artificial muscles occurs. To solve this problems, the paper also deals with design of some models.
Research on the Middlings from Dong Anshan Iron Ore by Roasting-Magnetic Dressing
Authors: Lu Ji Wei , Wang Nai Ling , Yin Wan Zhong , Zhao Rui Chao , Yuan Chuang
Published: November 2013

For the middlings (containing siderite) separated from Dong Anshan carbonaceous iron ore which was dressed by a two-step flotation process, using roasting-magnetic and regrinding-magnetic separation, the iron concentrate with iron grade and iron recovery of 60.31%, 87.49% was obtained. Mechanism of reduction-roasting was studied by means of XRD in the end.
Study on Grinding Effect of the Different Grinding Aids
Authors: Yuan Chuang , Ma Shao Jian , Li Ming Ming , Zhang Qi Dong , Xu Hong Xiang , Lu Ji Wei
Published: November 2013

To improve the grinding of cassiteritepolymetallic sulfide ores, this paper studied the effect of six kinds of grinding aids. We found that these six kinds of grinding aids can change the grinding effect, but only PAM can make the eligible size fraction increase and decrease the lack-grinding size fraction and the overgrinding size fraction, and reaches the effect of the original study expectation.
Suspended Magnetic Roasting Study of Fine Grained Iron Ore
Authors: Wang Ru , Han Yue Xin , Li Yan Jun , Zhang Yu Shu
Published: November 2013

Suspension roasting furnace was used as the reactor of magnetic roasting of fine grained siderite, and the N2 was used as the conveying gas. The results show that, the siderite ore be roasted at the conditions of gas velocity is 1.7m/s, and the roasted time is 12.35s, according to magnetic separation can obtained iron concentrate grade is 65.04%, and recovery rate is 93.03%.
The Anionic Reverse Flotation Orthogonal Experiment for XuanLong Oolitic Hematite after Magnetic Roasting-Magnetic Separation
Authors: Gao Ye , Zhang Ya Hui , Ouyang Guang Zun
Published: November 2013

The concentrate of XuanLong oolitic hematite after magnetic roasting-magnetic separation are further refined. The anionic reverse flotation process is used. The three factors and three levels orthogonal experiments are designed to find appropriate reagent regime and shorten the time. The results demonstrate that the appropriate reagent regime and the effect of the various factors to flotation can be found through nine experiments. Final reagent regime is that the dosage of starch is 1000g/t, the dosage of lime is 3000g/t, the dosage of collector is 500g/t. The final concentrate grade is 63.83%.The recovery is 84.59%.
The Effect of Grinding Time on Difficult-to-Float Coal
Authors: Cheng Gan , Xu Hong Xiang , Huang Gen , Yuan Chuang , Feng Xue Hua
Published: November 2013

Coal is a valuable natural resource for economic development. Clean coal and gangue can be liberated through grinding to improve the recovery of the clean coal. In this study, the mineral composition, size distribution of the raw coal and the grinding time test were investigated. The results showed that the main gangue minerals in the raw coal were kaolinite, quartz, illite, and smectite. The cumulative yield of ash increased sequentially with increasing grinding time. A longer grinding time corresponded to a higher degree of dissociation.
Application of a Novel Collector DXS in Cassiterite Flotation
Authors: Zhu Yi Min , Yang Yan Ping , Wang Wen Dan , Li Yan Feng , Ren Duo Zhen , Tang Zhi Dong
Published: November 2013

A comparative study on the collecting effect to cassiterite was studied using a new carboxylic acid modified collector DXS and traditional collector salicylaldehyde hydroxamic acid as collectors, respectively. In addition, the relationship between floatability of DXS and crystal structure of cassiterite was investigated. By means of infrared spectroscopy analysis of the cassiterite surface before and after adsorbing DXS molecules, the adsorption mechanisms of DXS on the surface of cassiterite were analyzed.Keywords: carboxylic acid modified collector DXS; cassiterite; flotation mechanism
Adsorption of Alizarin Red from Aqueous Solution by Modified Furfural Residue
Authors: Ren Guang Jun , Wan Xiao Peng
Published: November 2013

An adsorbent was synthesized from modified furfural residue. The properties, kinetics and thermodynamics of alizarin red from water adsorption process on modified furfural residue were studied. The adsorption isotherm indicat that the relationship between adsorbing capacity (qe) and equilibrium mass concentration (Ce) is in accordanced with the isothermal adsorption equations of Langmuir. sorption process of modified furfural residue for alizarin red was decalescence reactionphysical adsorption. alizarin red as an adsorptive material was an effectual method. alizarin red as an adsorptive material was an effectual method. The exploitation and utilization of this furfural residue must bring obvious economic and social benefit to us
Development and Prospect for Domestic and Overseas White Carbon Black
Authors: Jiang Yu Zhi , Wang Li Hua , Zhang Zhong Yang
Published: November 2013

White carbon black (WCB) has important applications in many fields such as rubber production and bioengineering and it has become one of the most promising functional materials currently available on the market. This paper summarizes the preparation of domestic and overseas WCB and it introduces the application progress of WCB. The main problems regarding to the development and application of WCB and its future in China are also discussed.
Experimental Study on the Ultrafine Powder Admixture of Fly Ash and Silica Fume
Authors: Li Qiang , Huo Jin , Ma Zhi Jun , Li Yuan , Wang Jun Ce , Wang Wei
Published: November 2013

The ultrafine powder composite admixture of fly ash and silica fume were researched in this article according to ultrafine powder fly ash and silica fume features.Through the different proportions of admixture strength test to determine the best ratio.The experimental results showed that appropriate admixture with 21.5%,12% of fly ash,8% of silica fume,1.5% of compound activator 28 days of flexural strength could be achieved 10.8Mpa,compressive strength could reach 54Mpa.
Preparation of Composite Micro-Bead with Nano-SiO2 Structure Shell by Carbonization
Authors: Li Zi Heng , Xue Yuan , Hao Xiang Yang , Gai Guo Sheng , Yang Yu Fen , Yang Bing
Published: November 2013

Following the mechanism of heterogeneous nucleation, orthosilicate nuclei deposited on surface of fly ash micro-bead, forming a shell with micro and nanoscale structure, just like nanoscale structure on lotus leaf. Optimized coating-reaction condition is discussed. These composite micro-beads can be used for cheaper super-hydrophobic coating.
Preparing ACB/UHMWPE Composite by PCS Process and its Electric Resistance-Temperature Behavior
Authors: Hao Xiang Yang , Hua Xiao Ying , Gai Guo Sheng , Lu Jian
Published: November 2013

Composite particles with ultra-high molecular polyethylene (UHMWPE) matrix core and acetylene black (ACB) shell were produced by particle composite system (PCS), and molded into conductive polymer composites. Morphology of these composite particles was investigated by SEM. Matrix particles were coated by ACB nanoparticles very well. Conductive networks of ACB in polymer composites were seen by SEM. The results of electrical behavior study show that the polymer composites exhibit low percolation threshold and its electric conductivity is less affected by temperature due to unusual ACB distribution. Related mechanism is discussed.
Research on the Mechanical Performance of Magnesium Hydroxide Whiskers/Polymer Composites
Authors: Jiang Yu Zhi , Zhang Zhong Yang , Wang Li Hua
Published: November 2013

The modified and unmodified magnesium hydroxide whiskers (MH) were mixed with PE, PP, ABS matrix respectively. The mechanics performance of MH/polymer composites was tested by the universal testing machine. The effect of modified and unmodified MH whiskers addition on the performance of composite material mechanics was studied. The results show that the whiskers modified by sodium stearate had a significant mechanical improvement to the MH/PE, MH / PP and MH/ABS composites than unmodified whiskers. The content of modified MH whiskers added to PE, PP, ABS matrix materials are different when the best comprehensive mechanical properties are obtained, which are 20%20% and 40% respectively. Overall, the modified MH whiskers had a significant enhancement effect on the general plastics and engineering plastics.
Research on the Synthetic of Silicone Emulsion
Authors: Mu Rui , Ji Cui Hua
Published: November 2013

This study synthesized silicon emulsions by emulsion polymerization, mainly focused on how influencing factors including catalyst, emulsifier, reaction temperature and synthesis process could affect product conversion rate, appearance and molecular weight.
The result showed that the conversion rate of the first 2 hours increased rapidly and became stable afterwards. Molecular weight increment was proportional to the extension of the reaction time. The silicon emulsions could achieve high convention rate and stability while applying 5% catalyst DBSA and 3% emulsifier (OP-10: SDS = 1:2) of Octmethyl cyclotetrasiloxane(D4) under an reaction temperature of 80 °C.