bluuebunny/crossref_metadata_2025 huggingface dataset:
THE APPLICATION OF SPHERICAL HARMONICS FOR DESCRIBING A CUBE-SHAPE PARTICLE / SFERINIŲ HARMONINIŲ FUNKCIJŲ TAIKYMAS KUBO FORMOS DALELEI APRAŠYTI
Authors: Radvilaitė Urtė
Published: March 2015

The paper disccusses various models for discrete element methods of modelling particle shapes. The multi-sphere method is most frequently used, though a polyhedral approach and a hybrid sphero-polyhedral model can also be introduced. All above mentioned methods precisely approximate particle shapes, and difficulties in modelling contact between particles arise. Thus, there is a need to have an universal method that gives the analytical expression of the shape. For this purpose, spherical harmonics have been introduced. The article presents the concept of the spherical harmonics model and experimental results describing the cube-shape particle. Šiame straipsnyje aptariami įvairūs diskrečiųjų elementų metodo modeliai, taikomi dalelių formoms modeliuoti. Dažniausiai taikomas kelių sferų modelis, bet yra pristatyti ir daugiasienis modelis bei mišrus sferos daugiasienis modelis. Nors aptariami metodai neblogai apkroksimuoja dalelių formą, atsiranda sunkumų skaičiuojant dalelių kontaktą. Todėl reikalingas universalus metodas, leidžiantis gauti analitinę dalelės formos išraišką. Būtent tokiam tikslui naudojamos sferinės harmoninės funkcijos. Straipsnyje pristatomas sferinių funkcijų modelis bei pateikiami eksperimento rezultatai kubo formos dalelei aprašyti.
Effectiveness of Total Contact Insoles in Patients with Plantar Fasciitis
Authors: Oliveira Hilda Alcântara Veiga , Jones Anamaria , Moreira Emília , Jennings Fabio , Natour Jamil
Published: March 2015

Objective.

To assess the effectiveness of total contact insoles (TCI) in patients with plantar fasciitis (PF).

Methods.

A double-blind randomized controlled trial was carried out with intention-to-treat analysis. Seventy-four patients were randomly allocated to use a TCI made of ethylene vinyl acetate (study group, n = 37) or a flat insole (control group, n = 37). The following assessment tools were used: visual analog scale for pain while walking and at rest, Medical Outcomes Study Short Form-36 (SF-36) for quality of life, Foot Function Index and Foot Health Status Questionnaire for foot function, 6-min walk test (6MWT), and baropodometer FootWalk Pro for plantar pressure analysis. The groups were evaluated by a blinded assessor at baseline and after 45, 90, and 180 days.

Results.

The groups were homogeneous for the majority of variables at baseline. The over-time comparisons show a statistical difference between the groups for pain while walking (p = 0.008) and the 6MWT (p = 0.010). Both groups showed significant improvements in pain at rest, foot function, and some quality of life variables (physical functioning, bodily pain, vitality, and social functioning), with no significant statistical differences between them. The baropodometer recorded no changes from the use of the insoles.

Conclusion.

A TCI can be used to reduce pain while walking and to increase walking distance in individuals with PF.
Prednisone in Uric Acid Lowering in Symptomatic Heart Failure Patients with Hyperuricemia — The PUSH-PATH3 Study
Authors: Meng Hong , Liu Gang , Zhai Jianlong , Zhen Yuzhi , Zhao Qingzhen , Zheng Mingqi , Ma Guoping , Wang Le , Tian Li , Ji Lishuang , Duan Linan , Li Lizhuo , Liu Kunshen , Liu Chao
Published: March 2015

Objective.

To determine the safety and efficacy of prednisone in patients with symptomatic heart failure (HF) and hyperuricemia.

Methods.

Prednisone therapy was administered for a short time to 191 symptomatic HF patients with hyperuricemia (serum uric acid > 7 mg/dl).

Results.

Prednisone significantly reduced serum uric acid by 2.99 mg/dl (p < 0.01) and serum creatinine by 0.17 mg/dl (p < 0.01). These favorable effects were associated with a remarkable increase in urine output, improvement in renal function, and improvement in clinical status.

Conclusion.

Prednisone can be used safely in symptomatic HF patients with hyperuricemia.
Local Hardness Variation of Ti50Cu32Ni15Sn3 Processed by Laser Beam Melting (LBM)
Authors: Karg Michael Cornelius Hermann , Ahuja Bhrigu , Hentschel Oliver , Schmidt Michael
Published: March 2015

Amorphous metals which are synonymously called metallic glasses form a rather young group of engineering materials. Compared to crystalline metals they offer unique combinations of properties: tensile strength, hardness, elastic strain, resistance against corrosion and abrasive wear are rather high. In order to minimize crystal growth, rapid solidification from the liquid phase is required. High cooling rates are a characteristic property of the additive manufacturing technology Laser Beam Melting in Powder Bed (LBM). This paper shows first results of processing Ti50Cu32Ni15Sn3 by LBM. Unlike many other alloys with high glass forming ability, it does not contain costly rare earth elements. No literature is known to the authors about LBM of this material. Because relative density close to 100 % is a prerequisite for producing parts with high mechanical performance, a parameter study was conducted varying scan speed, hatch distance and laser power in wide ranges. The obtained samples are characterized by metallographic sections, hardness measurements and X-ray diffraction. Apart from reaching high relative densities, a wide variation in Vickers hardness over the length of samples was found. It corresponds to the locally different thermodynamic conditions. Apart from introducing a new material with promising properties to the manufacturing technology of LBM, this might open up a new approach to modify mechanical material properties in a single work piece made from uniform powder by adapting LBM process parameters. Both the range of applications for LBM as well as the range of geometries producible from amorphous metals might be expanded.
Les communistes espagnols : les années difficiles (1947-1956)
Authors: Buj Serge
Published: March 2015

À travers quelques documents relatifs aux années de clandestinité du pce, en particulier à travers un certain nombre de rapports rédigés à l’occasion d’assemblées de militants, de congrès ou de conférences, nous tenterons de comprendre l’image que le parti souhaitait donner de lui-même, de sa force, de son organisation, de ses progrès et de son action, avec une préoccupation essentielle : exister et se renouveler. Le Parti Communiste d'Espagne ne comptait qu’un petit nombre de militants au moment de sa fondation, et il n’est devenu un parti de masses que dans des circonstances bien particulières pendant la guerre civile. Il s’est donc formé comme parti militarisé, disposant d’une maigre expérience politique et d’une organisation sans grande histoire. Le passage à la construction d’un parti démocratique ne se fera qu’à partir de la toute fin des années soixante. Entretemps, il fut soumis à l’épreuve de la clandestinité, à une intense répression, mais l’ennemi le plus féroce était le temps, le long temps de l’usure des enthousiasmes.
Imaginary museums: What mainstream museums can learn from them?
Authors: Morris Rachel
Published: March 2015

The world is full of museums that don’t exist fully in three dimensions – museums described in words or drawn on paper; museum catalogues; museums on the web. There are also many museums that are the creation of artists, novelists and poets, and so have a strong thread of imagination running through them. The latter cast an interesting light on ‘real’ museums and compel us to ask: What is it that the metaphor of a museum enables writers and artists to say? The question is doubly interesting because there is a long history of these 'imaginary’ museums created by artists. This paper suggests that there are five qualities of museums that writers and artists tune into: the power of objects to take us back in time; the apparent ‘alive-ness’ of objects; the power of collections (which is different to the power of individual objects); the ability of museums to shape the world and tell us stories about it; and the role of museums as powerful metaphors through which we can talk about loss, fear and yearnings for the past. So writers and artists find museums powerfully imaginative places; but then so do visitors. Visitor research shows that visitors come to museums ready to use their imaginations. So my question is: Do ‘real’ museums do enough to work with the visitors’ imaginations? Or, to put it another way, Do enough museums think that the visitors’ imagination – and indeed their own - is relevant to the museum experience? It should be. It is.
La performance énergétique des bâtiments à l’ère des politiques européennes de démonstration. Le cas du programme CONCERTO et du projet de la ZAC De Bonne (Grenoble, France)
Authors: Labussière Olivier
Published: March 2015

Ce papier propose d’explorer l’articulation au secteur du bâtiment de l’approche par la démonstration issue de politiques européennes d’innovation technologique, en prenant pour cela le cas du programme européen CONCERTO et de l’expérience française de la ZAC de Bonne à Grenoble. Après avoir resitué les enjeux conceptuels qui sous-tendent l’analyse des pratiques de démonstration (i), cet article donne des éléments de contexte relatifs à la Stratégie de Lisbonne et détaille les ambitions du programme européen CONCERTO (ii), puis il analyse le projet de la ZAC De Bonne en prêtant attention aux dynamiques scalaires européennes, locales et nationales (iii), avant d’ouvrir une discussion sur le rapport au temps des politiques de démonstration et leurs effets contradictoires en termes de diffusion des apprentissages (iv).
The Forced Vibration Analysis of Beams Based on a Time-Domain Differential Quadrature Method
Authors: Lin Fan , Peng Jian She , Yang Liu
Published: March 2015

Under driving forceF(x,t)=Q*sinwt, a time-domain DQ (differential quadrature) method for dynamic problems of beams with initial-boundary value conditions is presented in this paper. On the basis of governing partial differential equation, the discrete DQ method adopted both in space domain and time domain in this method gives rise to new differential quadrature linear equations with complete initial-boundary value conditions for solving all parameters of the displacement-field. The numerical examples show that the computational accuracy and efficiency of time-domain DQ method is better than finite element method based on time-domain difference.
The Modal Analysis of Herringbone Gear Assembly
Authors: Li Ke
Published: March 2015

The inherent vibration frequency of the herringbone gear assembly model was derived by using ANSYS Workbench software. For different vibration frequencies, vibration mode analysis is undertaken. The deformation law of the herringbone gear assembly in the inherent vibration frequency is obtained and the rationality of gear design is verified.
Design of the Blades of Small Horizontal Axis Wind Turbines
Authors: Liu Quan , Zhen Zhen
Published: March 2015

According to the existing wind turbine blade design of classical theory to design the shapes of blades, choosing the standardized airfoils, using the parameters of each section of the blade to build 3D modeling by Pro/E software, using ANSYS finite element analysis software to determine the rationality of the design. In order to manufacture the blade light weight, high strength, the paper also studied manufacturing process of blades.
Design and Simulation of Thermopile Sensor Technology Based on Porous Silicon
Authors: Dou Yan Wei , Qiu Cheng Jun , Zang Bo , Wang Jing Xuan , Zhang Xiao Dong
Published: March 2015

Thermopile sensor using porous silicon (PS) as thermal isolation layer was designed. Thermal stability and mechanical property of sensor were simulated by IntelliSuite CAD software. Analysis results showed stress and temperature distribution of PS layer. Ansys simulation indicated that thermocouple’s thermoelectromotive force was decided by its material composition. If thermocouple was composed of polycrystalline silicon/aluminum, its thermoelectromotive force would reach 256.8 μV/K.
Fault Diagnosis with Mult-Signal Test for Reciprocating Compressor
Authors: Wang Jiang Ping , Duan Teng Fei
Published: March 2015

High frequency vibration signal, cylinder-inside pressure and ultrasonic wave are monitored under working condition of a reciprocating compressor. High frequency vibration signal and ultrasonic wave are processed using high frequency band-pass filtering, and then enveloped. The pressure signal is filtered with a low-pass digital filter. The fault causes of the machine can be determined by the enveloped waveform of vibration signal and ultrasonic wave, as well as the pressure curve comprehensively. We can confirm the truth that this fault diagnosis method is accurate and reliable for reciprocating compressors through a number of the results of fault diagnosis.
The Design of Automobile Wheel Hub Runout Online Detection System
Authors: Yang Xiao Dong , Men Yu Zhuo , Yu Lei , Gao Jin Gang
Published: March 2015

The intelligent online measurement relates to many subjects of optical, mechanical, electronic and computer cutting-edge technology has a very important significance to the production practice. In order to realize rapid detection of automobile wheel hub runout online, convenient access to the car wheels runout error parameters, this paper study and design of the beat error detection system of non-contact measurement technology based on laser, can be achieved online accurately automobile wheel hub runout and axial run out measurement, and products of automatic sorting through analysis of measurement results.
Design of the Clamping Mechanism on Welding Equipment in Hot Chamber
Authors: Chen Fang Quan , Chen Guo Xiang , Shao Dao Yong
Published: March 2015

This text introduces one non-standard new clamping mechanism which is used to clamp the nuclear fuel rods in welding process. For hard working conditions in hot cell, it requires that the equipment should be anti-radiation, also with good stability and certain precision.
The Determination of Thermocouples Optimum Number in the Blast Furnace Hearth for Control of its Condition
Authors: Dmitriev Andrey N. , Zolotykh Maxim O. , Chesnokov Yury A. , Ivanov Oleg Yu. , Vitkina Galina Yu.
Published: March 2015

The algorithm of a sensors arrangement in the blast furnace laying taking into account classification and the indications analysis of doubtful temperature sensors in 5 blast furnaces of the People's Republic of China is developed. When developing algorithm the adaptation of an arrangement of temperature-sensitive elements in a laying to the developed mathematical model of a laying heat [1, 2] for the purpose of minimization of their quantity and increase in reliability of indications at the expense of increase of density of their arrangement in the most dangerous zones of a laying and an exception of superfluous sensors in the zones being characterized by low degree of wear. The scheme of an arrangement of thermocouples for the blast furnace in volume of 5100 m3 is offered.
The Method of Dynamic Measurement in Light Distribution Performance Test
Authors: Wang Kun Qi , Na Dan Dan , Zheng Wei
Published: March 2015

In order to realize the measurement of dynamic light, a new measurement method of dynamic gain adjustment was proposed in this paper. And the method is combined hardware with software by the programmable amplifier with microprocessor. The value of signal peak is stayed by the peak hold circuit to be reference for gain amplifier. The test speed of dynamic light source is increased greatly through using this method. The dynamic source light can be measured in real-time by programmable gain instrument amplifier which is controlled by microprocessor. The result shows that the measurement error can be reduced to 0.1% in range of the light intensity at 1cd- 2400cd by this method.
Dynamic Response Analysis of Mistuned Space Flexible Mechanism
Authors: Yu Lin Chong
Published: March 2015

Mistuned responses are very complicated because the kinetic characters of flexible mechanism are highly nonlinear. A new approach of virtual prototype modelling and kinetic simulation was presented in order to analyze mistuned dynamic responses of flexible mechanism. Artificial Neural Network (ANN) and importance sampling method were applied for the simulation. Statistical distribution of kinematical parameters was gained. As an example, a flexible expand mechanism model of space station was employed to test this method. The results prove that this method is available for kinematical analysis of complicated flexible mechanism. It has the advantage of high precision and reasonable computational cost.
Design of the Automatic Diagnostician System Based on Palm Images
Authors: Mo Xin Ping , Pan Zhi Guo , Du Hong Wei
Published: March 2015

In order to study the feasibility of the automatic diagnostician based on the images of palm, the general framework of automatic diagnostician is designed. It is implemented after analysis of the process of image recognition of palm images by computer and the main research content of each functional module is pointed out. Using the method of image processing, some palm images are collected by scanner. After proper preprocessing, images of palm's clear borderline can be acquired. The design of the philosophy system and images preprocessing have positive significance to the development of automatic diagnostician.
The Detection Method of Lane Line Based on the Improved Otsu Threshold Segmentation
Authors: Tang Yang Shan , Xia Dao Hua , Zhang Gui Yang , Ge Li Na , Yan Xin Yang
Published: March 2015

For overcoming the shortage of Otsu method, proposed an improved Otsu threshold segmentation algorithm. On the basis of Otsu threshold segmentation algorithm, the gray level was divided into two classes according to the image segmentation, to determine the best threshold by comparing their center distance, so as to achieve peak line recognition under the condition of multiple gray levels. Then did experiments on image segmentation of the lane line with MATLAB by traditional Otsu threshold segmentation algorithm and the improved algorithm, the threshold of traditional Otsu threshold segmentation algorithm is 144 and the threshold of the improved Otsu threshold segmentation algorithm is 131, the processing time is within 0.453 s. Test results show that the white part markings appear more, the intersection place of white lines and the background is more clear, so this method can identify lane markings well and meet the real-time requirements.
Image Restoration Based on Pulse Coupled Neural Network
Authors: Xu Yong Sheng , Wang Shu Wen , Wu Tao
Published: March 2015

Image is the unity structure and texture, structure reflects to the contours and the boundaries between different regions in the image, and the texture is a reflection of the details within an area in the image, therefore the optimal restoration effect can not be achieved if structure or texture is considered separately during the process of image restoration. In order to solve the problems above, the corresponding solution proposed in this paper is as follows: first, the structural characteristics of the image to be repaired are obtained by using pulse coupled neural network; then both the textural features and the structural features are taken into consideration simultaneously when it comes to the priority of the image restoration as well as the calculation of the optimal sample block. It can be seen from the experimental results that the algorithm described herein can effectively improve the quality of image restoration.
Routing Algorithm in Wireless Sensor Networks Based on Multi-Optimization Function
Authors: Zhang Jian
Published: March 2015

As the deficiencies of present Wireless Sensor Network Routing Protocol in extending network lifetime and improving network performance, a kind of Routing Algorithm based on Multi-optimization Function is proposed in order to achieve the optimization goals of balancing network node energy consumption and extending network lifetime. By introducing parameters like available energy of nodes, routing hops and physical distance between nodes into routing selection function, optimum path is set up. Therefore, the integrated optimization of Wireless Sensor Network performance is realized. As NS2 emulation result shows, this algorithm has achieved higher transmission reliability, lower energy consumption and much longer network lifetime. Compared with traditional directed diffusion algorithm, the rate of data transmission success has risen by 15.3%, utilization ratio of network energy by 9.7%, and network lifetime by 37.8%. Routing Algorithm based on Multi-optimization Function has more advantages in Wireless Sensor Network.
Automotive Air Conditioning Compressor Noise Source Identification Method
Authors: Huang Xiao Bo , Ye Jun , Xiong Shu Sheng , Mao Bin Tao , Wang Ying Hui , Guo Bao Sheng , Sun Ya Bo , Zhang Yu Fan
Published: March 2015

With the improvement of requirements for vehicle comfort, people put forward higher requirements on the noise control of automotive air conditioning. As the power source of the automobile air conditioner, the compressor is also the main noise sources, so it is the major objective of vibration damping and noise reduction. In this paper, with analyzing the noise mechanism of compressor, introduces four identification methods of automotive air conditioning compressor noise source, providing theoretical basis for automobile air conditioning damping and noise reduction.
Experimental Study on the Noise of Turbocharger
Authors: Liu Ya Ru , Cui Qi Ming , Li Hui Bin
Published: March 2015

Based on the experiments on noise and vibration of turbocharger, useful information of these signals were extracted. It is found that the noise distribution, loudness, axial vibration and other information could be used to monitor the turbocharger’s quality.
Vibration Response Analysis on Spindle System of Milling Machine
Authors: Yao Ting Qiang , Tan Yang , Huang Ya Yu
Published: March 2015

The dynamic characteristics and dynamics parameters of rolling bearings is very important to dynamics and vibration response of rotate machine such as rotor systems, gear systems and Spindle systems. The frequencies of rotate machine are affected by dynamics parameters of rolling bearings at different places. The purpose in the work presented is to research a new approach and multibody model of Spindle systems with equivalent dynamics parameters of rolling bearings. The flexible Spindle body has been constructed by the fixed interface component mode method. The four different models of rolling bearings for Spindle systems have been developed using equivalent spring and damper elements. The experiments of Spindle body and Spindle system have been carried out. Experimental modal frequencies have been got by impulse vibration test and sweep frequency vibration test. The frequencies and vibration response of Spindle systems have been calculated by adjusting equivalent spring and damper elements to minimizing errors between the calculated and experiment frequencies. The results show the errors of frequencies of linear equal and unequal spring and damper models are large except the first frequency. However, the errors of nonlinear equal and unequal spring and damper models are small. The predicted frequencies of nonlinear unequal spring and damper model are the most accurate and agree well with the experiment results. The presented method can be applied to calculate the nonlinear equivalent stiffness parameters accurately for rolling bearings in multibody systems.
Experimental Study on Mixing Performance of HWT-15 Mixer
Authors: Wang Bo , Zhang Ling Lin , Zhang Li Hua
Published: March 2015

Development of feed industry is the way to achieve sustainable development of animal husbandry.and mixer has a pivotal role in this process. In this paper, optimization factors were the speed of mixer(32-68r/min), the mass of mixing material(6-14kg) and mixing time(10-480s) while investigated responses was mixing uniformity.The order of strength and the best valve of the factors when mixing were determined to obtain. The order was found to be the mass of material first,the speed of mixer second, and then mixing time and the best values of factors were found to be mass of mixing material of 14kg with speed of 36.48r/min for the mixing time of 3min. At this the best point, the The coefficient of variation were found of 8%. This paper provides a theoretical basis for further study on feed mixing equipment and technology for mixing process.
Modeling of Operation Function of the Unmanned Excavator in the Deterministic Surfacing Process
Authors: Zhou Jian Zhao , Shen Xin Min , Tu Qun Zhang
Published: March 2015

Unmanned excavator has been developed for the improvement of operation efficiency and the decrease of economics cost, on which the researches have attracted widely research enthusiasms. Deterministic surfacing method is an effective technique for the intelligent control of the unmanned excavator, and the key point is modeling of operation function. Through analysis of operation process, kinematic trajectory of the relieving tool is obtained. By simplifying structures and parameters of the operation system, both cross-sectional line and 3D feature which represent character of the operation function are obtained. Modeling of the operation function will promote application of the unmanned excavator and supply experience for advanced control of other unmanned construction machines.
Numerical Analysis of Erosive Wear on the Guide Vanes of a Francis Turbine
Authors: Zhang Hong Ming , Zhang Li Xiang
Published: March 2015

The paper presents the numerical analysis of erosive wear on the guide vanes of a Francis turbine using CFD code. The 3-D turbulent particulate-liquid two-phase flow equations are employed in this study. The computing domain is discretized with a full three-dimensional mesh system of unstructured tetrahedral shapes. The finite volume method is used to solve the governing equations and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators (PISO) procedure. Simulation results have shown that the volume fraction of sand at the top of the guide vanes is higher than others and the maximum of volume fraction of sand is at same location with the maximum of sand erosion rate density. The erosive wear is more serious at the top of the guide vanes.
Research of Working Mode Conversion Based on GDI Engine
Authors: Sun Ying Jie , Li Yang , Wang Chun Yu , Li Yao Chun , Liang Yun Feng
Published: March 2015

This paper designs the control strategy of working mode conversion from stoichiometric homogeneous mixture to lean homogeneous mixture. First of all, after the types and parameters of electric hardware were selected in this system, a complete circuit layout of engine control system was designed, which used microcontroller named MC9S12XDP512 as control chip and the test bench was built. Then, we adjust the fuel injection pulse width and throttle opening to realize lean burn (lambda = 1.4) of torque being 40N.m at speed of 2500 r / min, and adjust injection timing to find the best injection timing which is 350 crank angle degree, and adjust the ignition advance angle to find the best ignition advance angle which is 13 crank angle degree. Finally, the work mode conversion was completed by the optimal parameters linear interpolation, reducing the fuel injection pulse width and increasing the throttle opening at the same time.
Structure Design of Swirl Flow Tool in the Natural Gas Well
Authors: Wei Hang Xin , Wang Hong
Published: March 2015

In order to solve the problem of gas recovery by liquid drainage, the swirl flow tool was designed. Firstly, the whole structure of the swirl flow tool was introduced. The swirl flow tool includes three units, i.e. the screw basement, restrictor and setting mechanism. The characteristic of the tool is that there does not exist a gap between the outer diameter of the swirl flow tool and the inner diameter of the oil tube. Then, its work principle, setting process and deblocking process were discussed. The application results for the swirl flow tool in the oilfield show that the casing pressure is decreased by 7.0%-17.6% and the average gas production per day is increased by 7.4%-11.9%.
A Spherical Planning Based Electrifying Strategy of Permanent Magnet Spherical Motor
Authors: Guo Chen
Published: March 2015

Permanent Magnet SpherIcal Motor (PMSM) can be applIed on offshore O&M vessels for offshore wInd farms. An electrIfyIng strategy of PMSM Is proposed accordIng to the structure of PMSM wIth 3 layers of stator coIls. A statIc torque model of PMSM Is buIlt In thIs paper. In order to classIfy the statuses of rotor posItIon, spherIcal plannIng on stator spherIcal surface Is made and 4 classes of 72 sub-regIons are dIVIded accordIng to the dIstrIbutIon of stator coIls. Then stator coIls In each sub-regIon are marked wIth numbers and electrIfyIng rules of stator coIls In dIfferent statuses are desIgned. Of all the 54 stator coIls, 18 are sImultaneously electrIfIed under each status, wIth electrIfIed coIls unIformly dIstrIbuted. The concept OpposIte Corner CoIls of SpherIcal Surface (OCCSS) Is proposed. AccordIng to the control torque of PMSM, statIc torque model and the characterIstIcs of OCCSS, the currents flowIng though the electrIfIed 18 stator coIls are calculated. NumerIcal sImulatIons of contInuous path motIon and poInt-to-poInt motIon of rotor verIfIed the ratIonalIty of the proposed electrIfyIng strategy. A hypothetIcal ImplementatIon scheme of the system on whIch the electrIfyIng strategy can be actualIzed Is proposed.
Analysis about the Work Space of a 3-RPR Parallel Mechanism Based Wind Tunnel Experiment Platform
Authors: Hu Yong Jin , Chen Wen Jia , Li Lu Yang , Zhang Jian , Shao Zi Yan
Published: March 2015

This paper introduces the characteristics of a 3-RPR parallel mechanism based on the wind tunnel experiment platform, makes use of the constraint condition of the inverse position solution of the structure, and uses MATLAB software to draw images of their work space and analyze the impact of the dimensional parameters of wind tunnel platform on the scope of work space, and it provides a theoretical basis for the design and practical of wind tunnel test platform.
Application of the Sliding Mode Control Approach Based on Double Power Exponential Reaching Law for the Hydraulic Servo System
Authors: Dong Cai Yun , Wang Hai Jun , Cui Wen Yong
Published: March 2015

The sliding mode control approach based on double power exponential reaching law is proposed for the hydraulic servo system. With the example of the hydraulic servo system in the lab, the mathematic model is established and the new controller is presented and simulated. Simulation results show that: the proposed approach has high track precision, fast response, small chattering and ensures dynamic quality of the system.
Research on Carrot Automatic Sorting Machine
Authors: Du Hong Wei
Published: March 2015

Mechanical devices combined with computer vision technology can be used for automatic grading for carrots and other slim fruits and vegetables. We design the mechanical device for carrot intelligent grading machine, which is mainly composed of three parts: two-stage spacer device, chain roller conveyor and linear motors sorting fruit devices. Equipped with staggered grid conveyor belt with baffles and differential belt, the spacer device realizes primary and secondary fruit uniform, which can achieve precise single fruit conveying. The roller conveyor drives carrots rotating into CCD camera field one by one, which catches comprehensive carrot shape features that help precise grading. After receiving the grading signal, the linear motor puts carrots into corresponding boxes of different levels through the U-shaped catheter, which pushes carrot smoothly, efficiently, and with low damage rate.
Design and Structural Analysis of Robot Arm for High Performance Packaging Robots
Authors: Liu Hui Yuan , Huang Han
Published: March 2015

Current packaging robots cannot achieve the required speed due to the use of heavy parts. Magnesium alloys with appropriate surface treatment may be used to replace the traditional steel or aluminum parts and therefore to reduce robot arm weight. In this work, different prototype designs were made to examine the feasibility of the application of light alloys for robot arm, in comparison to conventional materials. Finite element modelling (FEM) studies were performed for structural analysis. The results demonstrated that magnesium alloys has advantages over steel or aluminum alloys in terms of the ratio of modulus over density, and the stress and elastic deformation experienced during operation due to arm weight.
Kinematic Analysis of 4-UPU Parallel Mechanism Based on Influence Coefficient
Authors: Xia Guang Lan , Hu Xing Wei , Yin Bao Lin , Yu Feng
Published: March 2015

Mechanism kinematic influence coefficient deeply reflects the essence of the kinematics and dynamics mechanism, analysis of the problems of many institutions can use the influence coefficient of clear and clearly expressed. In this paper, with less degree of freedom parallel mechanism as the research object, through the virtual mechanism method to derive one or two order influence coefficient matrix, based on the analysis of the mechanism and influence of speed and acceleration coefficient matrix. Finally, the precision of the method for solving the kinematics is proved by examples of numerical analysis.
Monocular Camera Calibration Method for Robot System
Authors: Huang Li Lun , Li Wen Guo , Yang Qi Le , Chen Ying Chun
Published: March 2015

The basic principles of camera calibration are first analyzed, and the method of camera calibrate based on 2D plane circular array is presented. The first process is the use of the canny edge detection operator, and get the edge coordinates of ellipse. Then the ellipse is fitted to obtain the center point of the ellipse, and the centre point coordinates of ellipse is used to regard the feature points to implement camera caliblation. Finally, Zhang Zhengyou's method is used to obtain internal and external parameters of camera. This calibration method can be used to calbration of robot system.
Research on Disparity Map Generation Method of Underwater Target Based on the Improved SIFT Algorithm
Authors: Wang Di , Pang Yong Jie
Published: March 2015

In order to obtain the depth information of the underwater target, it’s necessary to generate the disparity map based on binocular vision stereo matching. In the circulation water channel, the stereo matching experiments with underwater target were carried out by using the BM algorithm, SGBM algorithms and SIFT algorithm respectively. Then the characteristics of the disparity maps were analyzed for the three kinds of stereo matching algorithms. Compared with the BM algorithm and SGBM algorithms, the SIFT algorithm has been proved to be more suitable for underwater stereo matching. In order to obtain more feature points of underwater image, it is necessary to improved SIFT algorithm parameter. Underwater image matching experiments were made to determine the principal curvature coefficientγ. The results illustrated that the improvedγis better than the original value for underwater disparity map generation.
The Study of Wide-Format Digital Inkjet Printers’ Carriage Control Method with Double-Carriage
Authors: Cao Ying Yu , Gong Hui Qi , Jin Jia Yi , Wu Wang De , Wang Ji Zong
Published: March 2015

Aiming to shorten the inkjet printing mechanism single printing time based on the existing digital printing machine,the plan of wide-format digital inkjet printer with double-carriage was proposed to improve the printing speed.Referencing these ordinary printing machine products, the double-carriage reasonable motion parameters were given and the equations of the motion were established.After simulating the real printing process,the phenomenon of collision and printing deficiency was avoided by the way“carriage will give the way".PID control algorithm was adopted to control the carriages’ displacement and solve the coupling problem of mechanical systems.The ADAMS/Simulink combined simulation control systems ensures the displacement fluctuations within the permissible range.
Structure Analysis of Toss Feeding Stalk Baler
Authors: Yu Xin Qi , Xu Zhi , Liu Qing Gang , Zhao Yu Fei , Peng Pei Ying , Zhang Zhao
Published: March 2015

In this paper, the entire structure and operating principles of the toss feeding typed stalk baler are introduced. The baler is mainly consisted of collecting, feeding, compression and knotting component. A Y-shaped straw chopper blade is used in the collecting. A combination component of auger and toss machine is adopted in the feeding system. The sliding block of compressor is driven by rod-crank mechanism. Structure analysis shows that the toss feeding typed straw baling machine has advantages of simple structure, high efficiency and low manufacturing cost. At the same time, the structural analysis provides an important theoretical basis for further optimal design of baling machine.
The Research and Application on Advanced Hot Rolling Scheduling System
Authors: Liu Li Lan , Liu Xue Wei , Liu Chao , Wang Sen , Zhou Wei
Published: March 2015

Complex constraints, huge energy consumption and many other factors lead to the difficulty in hot rolling scheduling. This paper propose a new system to solve this scheduling problem. In order to meet the demand of an independent hot rolling plant, this system includes almost all functions in a scheduling process. C# and C++ is used to develop UI and intelligent algorithm. Oracle database and ADO.net is used respectively in data storage and connection with UI and algorithm. By integrating with Crystal Report, the change trend of relevant parameters can be seen and analyzed visually, which is convenient for modifying and improving. Through testing with some data selected from one hot rolling plant, usability is validated.
The Electrical Properties of the Probe under Different Loading Frequencies
Authors: Yuan Qing , Han Lei , Liu Chun Liang
Published: March 2015

A testing circuit of probe is designed to research the electrical properties of the probe under different loading frequencies. Sinusoidal signals of different frequencies are produced by Tektronix AFG3102 signal generator, and DSOX2022A Oscilloscope is used to measure the probe voltage,constant resistance voltage and the source voltage, so the phase between the probe voltage and constant resistance voltage can be calculated. Assumed the constant resistance is a pure resistance. Since the circuit is connected in series, so the phase between the probe voltage and the probe current can be calculated. The result reveals that the probe shows resistive when the phase between the probe voltage and the probe current is 0 ° within 200 KHz frequency. Beyond 200 KHz the phase between the probe voltage and the probe current increases to 60 ° and then declines to a steady value 40°, which shows that the probe is inductive.
Super Resolution and Denoising Model Research on TOF Camera
Authors: Xu Ning , Piao Yan
Published: March 2015

At present, the three-dimension imaging technology has developed rapidly, in monitoring, identification, navigationand other fields having been widely used. The SR4000 camera is a 3D imaging equipment which is based on TOF(Time of flight) technology.It is a kind of new, small 3D imaging equipment , which can capture gray, depth, and amplitude image at the same time. It has more incomparable advantages than traditional cameras. TOF three-dimension imaging technology has become a research hotspot at home and abroad.But the TOF camera also has its own defects.The resolution is low. And it is more easily affected by noise and surroundings . This paper proposes a kind of algorithm of super resolution reconstruction based on pocs. Furthermore, improve the pocs algorithm. This method has good improvement effect.In order to further improve the quality of the distance images, wavelet denoising is adopted on the basis of super resolution reconstruction .So, it has a good improvement for the captured distance images.
Research on Monitoring System of Gas Flow Meters Based on ZigBee Wireless Network
Authors: Zhu Jing , Wang Li Qiang , Zhao Guang , Liang Guo Dong , Mao Xing Xing , Yan Bing
Published: March 2015

ZigBee is a low-rate, low-power-consumption wireless communication technology, which can be widely used in the Wireless Sensor Network (WSN). ZigBee wireless network is applied to the monitoring system of gas flow meters in this paper. The design of hardware and software of the system based on Zigbee chip is given. The gas flow data is uploaded to the terminal node via RS485 serial port, and the terminal node transmits the data to the coordinator by the ZigBee wireless network, and then the coordinator sends the data to the PC by using RS232 serial port. In this way, the monitoring center can manage and analyze the data, so the real-time monitoring can be realized. It has been proved that the system has strong anti-interference ability, safe and reliable and stable operation.
Design and Application of Distributed Solar Power Quality Detection System
Authors: Chang Xue Fei , Lv Xiang Yu , Piao Zhe Yong , Li De Xin
Published: March 2015

This paper studies the stand-alone PV systems, including modeling and simulation of photovoltaic cells based on a battery charge and discharge algorithm design, simulation and design portion of the push-pull boost, simulation and design of single-phase inverter system through experimental platform was build, complete functional test of each module. After considering comprehensive choice as to interfere with observation control method in this paper, based on the principle of interference observation, simulation model in Matlab, through its simulation results and did not join algorithm results were compared and found can effectively increase the output power of the photovoltaic cell.
Design of Dust Monitoring System Based on Embedded Linux
Authors: Feng Yang , Zhou Long
Published: March 2015

This paper proposes the introduction of embedded technology in dust monitoring system to realize real-time monitoring online in factories. Taking S3C2440 as hardware platform and embedded Linux the developmental environment, the system also introduces a development kit Qt/Embedded from high-performance embedded system GUI. With a soft-hardware system scheme, it realizes the design of real-time monitoring on parameters like dust concentration in the air. Much emphasis has been laid on the analysis of system composition, working theory, hardware design and software development. Integrating functions of displaying, information processing, monitoring etc., the system has such advantages as high-speed, accuracy, high sensitivity and stable performance, and can be matched with various monitoring systems.
A Segmentation Algorithm Research of Forest Fire Image Based on YCBCR and Improved Local Fractal Dimension
Authors: Jiang Ai Ping , Bai Dong Dong , Zhu Bo Yu
Published: March 2015

Combined with the characteristics of forest image, the paper puts forward a new forest fire image segmentation method based on YCBCR and local fractal dimension. First of all, convert the image in RGB color space into YCBCR. Secondly, original triangle prism model algorithm which calculates the square of block matrix is replaced with four pyramid model. This algorithm is easy to be realized, reduce the amount of calculation model, and speed up the image segmentation speed. Segmentation effect significantly is improved, and the simulation experimental results show that this algorithm can be very good for the segmentation image of the flame extracted from complex background. It has obvious, accurate and fast effect and provides a good foundation for the future image analysis and recognition processing.
Real-Time Image Shift Detection with Cross Correlation Coefficient Algorithm for Correlating Shack-Hartmann Wavefront Sensors Based on FPGA and DSP
Authors: Shen Ting Ting , Zhu Lei , Kong Lin , Zhang Lan Qiang , Rao Chang Hui
Published: March 2015

Working on low-contrast, extended, time-varying objects such as the solar granulation, solar adaptive optics (AO) system uses correlation algorithms to detect image shift of the Shack-Hartmann (SH) wavefront sensor (WFS) instead of centroid algorithm in night-time adaptive optics system. An real-time image shift detection processor, which consists of a Xilinx FPGA and a TI DSP, has been developed for a low-order solar AO system based on cross correlation coefficient algorithm. Image shift of integer pixels can be calculated in the FPGA and DSP is responsible for parabolic interpolation to obtain subpixel accuracy. The experimental results show that the processor can obtain correct image shift and satisfy the time latency requirement of the AO system.
Action Recognition of Sleeping at the Desk Using Regression on a Dependency Graph
Authors: Luo Wang , Yu Lei , Feng Min , Hong Gong Yi , Peng Qi Wei , Li Zhi Hai
Published: March 2015

In this paper, we present a hierarchical method of activity recognition for sleeping at the desk in business hall. The method consists of three steps. First, the reference points such as body joints are obtained from workers in business hall. Second, we build the dependency graph to represent the relationships between reference points. Third, the multidimensional output regressions along the dependency paths are used to estimate the positions of these reference body points. Experimental results demonstrate that our method achieves comparable accuracy to state-of-the-art results.
Study on Liquid QCM Sensor Design and its Response Model
Authors: Chen Hai Xia
Published: March 2015

We use quartz crystal material from a physical point of constitutive equations derived in detail combined with the boundary conditions of the liquid Kanasawa QCM response model and Martin correction BVD equivalent circuit model; then apply transmission line theory and the theory of Acoustic impedance load, the research results can be useful as a QCM-D model, response model and Martin mode, then in-depth analysis of the liquid phase conditions, factors affecting the QCM frequency change, we propose a new method for measuring the density of the unknown liquid viscosity supplement. The main purpose of this chapter is to illustrate the viscous liquid medium under contact conditions, based on transmission line theory and the theory of load Acoustic impedance method compared to the classical method is simple, accurate, and effective.
An Optimization Model Based on Principal Component Theory and Genetic Algorithm
Authors: Huang Xiao Fei
Published: March 2015

Stock investment is risky and beyond fixed rules to forecast precisely. In order to realize proper stocks selection from specified mathematical function model, principal component factor analysis is proposed to rebuild various stocks via its contribution rates so as to extract the principal component factors from the elimination of weak ones. According to the synthesis scoring and ranking, optimized stocks has been selected as valuable targets. Test from Genetic Algorithm to the ranking aforementioned indicates that the rationality and validity of the results.
Strong Consistency of Maximum Likelihood Estimators in Sequential-Cumulative Logit Model
Authors: Yin Chang Ming , Li Xiao Jie , Fu Dan
Published: March 2015

In this article, for the sequential-cumulative logit model, we show that maximum likelihood estimates of regression parameter vector is asymptotically existence and strongly consistent under mild conditions
On the Almost sure Convergence Rate for Weighted Sums of Negatively Associated Random Variables with Application to Priestley-Chao Estimate
Authors: Huang Gan Ji , Xing Guo Dong
Published: March 2015

This paper deals with the problem of almost sure convergence rate for weighted sums of negatively associated random variables. A new convergence rate is obtained base on an exponential inequality, the result obtained extends and has a fast convergence rate compare with the existing result. As an application, we study the Priestley-Chao estimate of nonparametric regression estimate and the convergence rate is derived.