bluuebunny/crossref_metadata_2025 huggingface dataset:
Postoperative ischemic changes following brain metastasis resection as measured by diffusion-weighted magnetic resonance imaging
Authors: Gempt Jens , Gerhardt Julia , Toth Vivien , Hüttinger Stefanie , Ryang Yu-Mi , Wostrack Maria , Krieg Sandro M. , Meyer Bernhard , Förschler Annette , Ringel Florian
Published: October 2013

Object

Brain metastases occur in 10% to 40% of patients harboring cancer. In cases of neurosurgical metastasis resection, all postoperative neurological deterioration should be avoided. Reasons for postoperative deficits can be direct tissue damage due to resection, hemorrhage, venous congestive infarcts, or arterial ischemic events leading to tissue infarction. The aim of this study was to evaluate whether postoperative ischemic infarctions occur in surgery for brain metastasis and to determine their influence on new postoperative neurological deficits.

Methods

Patients who underwent resection of brain metastases and had preoperative and early postoperative (within 48 hours) MRI scans, including diffusion-weighted imaging sequences and apparent diffusion coefficient maps, between January 2009 and May 2012 were included in this study. Clinical and histopathological data (histopathological results, pre- and postoperative neurological status, and previous tumor-specific therapy) were recorded.

Results

One hundred twenty-two patients (56 male, 66 female) who underwent resection of brain metastases were included. The patients' mean age was 60 years (range 21–89 years). The mean time span from initial tumor diagnosis to resection of brain metastasis was 44 months (range 0–338 months). The mean preoperative Karnofsky Performance Status was 80% (exact mean 76% ± 17% [SD]), and the mean postoperative value was 80% (exact mean 78% ± 17%). Twelve (9.8%) of the 122 patients had postoperative permanent worsening of a neurological deficit or a new permanent neurological deficit; 44 (36.1%) of the 122 patients had postoperative ischemic lesions. When comparing patients with and without previous brain irradiation, 53.8% of patients with previous brain irradiation had ischemic lesions on postoperative imaging compared with 31.3% of patients without previous brain irradiation (p = 0.033). There was a significant association between ischemia and postoperative neurological status deterioration (transient or permanent); 13 (29.5%) of 44 patients with ischemic lesions had deterioration of their neurological status compared with 7 (9%) of the 78 patients who did not have ischemic lesions (p = 0.003).

Conclusions

This study demonstrates a high prevalence of vascular incidents in patients undergoing resection for metastatic brain disease. Patients harboring postoperative ischemic lesions detected by MRI have a higher rate of neurological deficits (transient or permanent). Patients who had previous irradiation therapy are at higher risk of developing postoperative ischemic lesions. A large number of postoperative neurological deficits are caused by ischemic incidents.
Drunken Environments: A Survey of Bartenders Working in Pubs, Bars and Nightclubs
Authors: Tutenges Sébastien , Bøgkjær Trine , Witte Maj , Hesse Morten
Published: October 2013

There is evidence that bartenders play a key role in respect of the health and safety of patrons in nightlife environments. However, little is known of how bartenders themselves are affected by the environments in which they work, especially with regard to their exposure to violence, pressure to drink and stress. We used a cross-sectional survey to assess the experiences of bartenders (n = 424) working in pubs, bars and nightclubs in Denmark. 71% of the respondents reported drinking while working, 6% reported using other drugs than alcohol at work, and 33% reported drinking even when they did not feel like it because of pressure to drink at work. Verbal assaults and threats were common and associated with higher levels of perceived stress. Bartenders’ work environment poses a risk for the development of alcohol use disorders. The fact that many bartenders consume significant quantities of alcohol during their working hours may pose a risk not only to their own safety, but also to that of their colleagues and patrons.
Microelectrode Arrays with Overlapped Diffusion Layers as Electroanalytical Detectors: Theory and Basic Applications
Authors: Tomčík Peter
Published: October 2013

This contribution contains a survey of basic literature dealing with arrays of microelectrodes with overlapping diffusion layers as prospective tools in contemporary electrochemistry. Photolithographic thin layer technology allows the fabrication of sensors of micrometric dimensions separated with a very small gap. This fact allows the diffusion layers of single microelectrodes to overlap as members of the array. Various basic types of microelectrode arrays with interacting diffusion layers are described and their analytical abilities are accented. Theoretical approaches to diffusion layer overlapping and the consequences of close constitution effects such as collection efficiency and redox cycling are discussed. Examples of basis applications in electroanalytical chemistry such as amperometric detectors in HPLC and substitutional stripping voltammetry are also given.
Video Sensor-Based Complex Scene Analysis with Granger Causality
Authors: Fan Yawen , Yang Hua , Zheng Shibao , Su Hang , Wu Shuang
Published: October 2013

In this report, we propose a novel framework to explore the activity interactions and temporal dependencies between activities in complex video surveillance scenes. Under our framework, a low-level codebook is generated by an adaptive quantization with respect to the activeness criterion. The Hierarchical Dirichlet Processes (HDP) model is then applied to automatically cluster low-level features into atomic activities. Afterwards, the dynamic behaviors of the activities are represented as a multivariate point-process. The pair-wise relationships between activities are explicitly captured by the non-parametric Granger causality analysis, from which the activity interactions and temporal dependencies are discovered. Then, each video clip is labeled by one of the activity interactions. The results of the real-world traffic datasets show that the proposed method can achieve a high quality classification performance. Compared with traditional K-means clustering, a maximum improvement of 19.19% is achieved by using the proposed causal grouping method.
Aux marges de la médecine rationnelle : médecins et charlatans à Rome au temps de Galien (IIe s. de notre ère)
Authors: Boudon-Millot Véronique
Published: October 2013

Cette étude propose une nouvelle analyse du statut des praticiens médecins et non-médecins du temps de Galien, en particulier ceux désignés sous le nom de « charlatans ». Elle contient un relevé des principaux termes utilisés pour désigner les différents intervenants actifs dans la sphère médicale et en particulier pharmacologique. Cette étude s'attache en outre au sens d'alazôn et de goêtes dans le corpus galénique et aux relations entretenues entre la médecine galénique rationnelle et ses expressions caricaturales, la divination et les incantations. Or, force est de constater que la médecine galénique n'est pas toujours exempte des influences de la magie et de la religion et que Galien lui-même s'exposa à l'accusation de charlatanerie.
Ubiquitous Technologies and the Emergence of New Learning Experiences
Authors: Monteiro Bruno de Sousa , Gomes Alex Sandro
Published: October 2013

With the popularization of mobile devices and access to Internet, there has been an intense growth in ubiquitous learning products and studies. How does this effectively impact learners’ (not just students’) and teachers’ daily lives? This chapter presents a literature review on ubiquitous learning, highlighting the impacts of this paradigm on the educational practice, seeking to combine this paradigm with social learning theories. Finally, the authors describe the extension of a social learning service called Redu, whose development is guided by the flexibility of pedagogical models, self-regulated learning, and by supporting the context, allowing a ubiquitous learning experience.
Ubiquitous Multi-Agent Context-Aware System for Enhancing Teaching-Learning Processes Adapted to Student Profile
Authors: Ovalle Demetrio , Salazar Oscar , Duque Néstor
Published: October 2013

The need for ubiquitous systems that allow access to computer systems from anywhere at anytime and the massive use of the Internet has prompted the creation of e-learning systems that can be accessed from mobile smart phones, PDA, or tablets, taking advantage of the current growth of mobile technologies. The aim of this chapter is to present the advantages brought by the integration of ubiquitous computing-oriented along with distributed artificial intelligence techniques in order to build student-centered context-aware learning systems. Based on this model, the authors propose a multi-agent context-aware u-learning system that offers several functionalities such as context-aware learning planning, personalized course evaluation, selection of learning objects according to student’s profile, search of learning objects in repository federations, search of thematic learning assistants, and access of current context-aware collaborative learning activities involved. Finally, the authors present some solutions considering the functionalities that a u-learning multi-agent context-aware system should exhibit.
A Model-Driven Methodology to Evaluate Performability of Metro Systems
Authors: Nardone Roberto , Marrone Stefano
Published: October 2013

Metro systems are required to continuously achieve acceptable levels of reliability, availability, maintainability, and performance (performability) in order to comply with the target values reported in operation and maintenance contracts. These requirements are regulated by several international standards that control the lifecycle defining both processes, documentation flows, and enabling techniques, aiming at controlling disturbances on service performed by the system. This chapter focuses on a complete model-driven methodology with the aim to support the performability evaluation of a metro system during design and in-service phases, as well as requirements assessment. In detail, the methodology allows the automatic generation of those formal models required for performability analysis, specialized according to the specific track layout and the defined operational strategies. The proposed methodology is perfectly coherent with the European Standard CENELEC EN 50126 and it allows the generation of all the technical reports needed in the related documentation.
Mobile Cloud Computing
Authors: Costa Jorge E. F. , Rodrigues Joel J. P. C.
Published: October 2013

Mobile devices have gained great importance in the daily lives of people. Smartphones and tablet computers make people’s lives easier by being more useful and offering more capabilities and services for a plethora of activities. Those devices include various sensing modules for collecting location information related to navigation, gravity, and orientation, which bring a diversity and intelligent ubiquitous mobile experience to users. In this chapter, cloud computing and mobile cloud computing are addressed in order to give insight about the topic and offer an important overview for this book. The diverse research definitions of these emerging technologies and contributions to enhance users’ lives are considered. Furthermore, the technologies and identified advantages to improve and justify the strong use of mobile cloud are discussed. Relevant mobile cloud computing applications are presented, showing good results and a promising future for mobile cloud computing technologies.
Transporting the Cloud
Authors: Estevez Claudio
Published: October 2013

Cloud computing is consistently proving to be the dominant architecture of the future, and mobile technology is the catalyst. By having the processing power and storage remotely accessible, the main focus of the terminal is now related to connectivity and user-interface. The success of cloud-based applications greatly depends on the throughput experienced by the end user, which is why transport protocols play a key role in mobile cloud computing. This chapter discusses the main issues encountered in cloud networks that affect connection-oriented transport protocols. These issues include, but are not limited to, large delay connections, bandwidth variations, power consumption, and high segment loss rates. To reduce these adverse effects, a set of proposed solutions are presented; furthermore, the advantages and disadvantages are discussed. Finally, suggestions are made for future mobile cloud computing transport-layer designs that address different aspects of the network, such as transparency, congestion-intensity estimation, and quality-of-service integration.
Mobile Healthcare Computing in the Cloud
Authors: Lee Tae-Gyu
Published: October 2013

Previous medical services for humans provided healthcare information using the static-based computing of space-constrained hospitals or healthcare centers. In contrast, current mobile health information management computing and services are being provided so that they utilize both the mobility of mobile computing and the scalability of cloud computing to monitor in real-time the health status of patients who are moving. In addition, data capacity has sharply increased with the expansion of the principal data generation cycle from the traditional static computing environment to the dynamic computing environment. This chapter presents mobile cloud healthcare computing systems that simultaneously leverage the portability and scalability of healthcare services. This chapter also presents the wearable computing system as an application of mobile healthcare.
Mobility Profiling
Authors: Nanni Mirco , Trasarti Roberto , Cintia Paolo , Furletti Barbara , Renso Chiara , Gabrielli Lorenzo , Rinzivillo Salvatore , Giannotti Fosca
Published: October 2013

The ability to understand the dynamics of human mobility is crucial for tasks like urban planning and transportation management. The recent rapidly growing availability of large spatio-temporal datasets gives us the possibility to develop sophisticated and accurate analysis methods and algorithms that can enable us to explore several relevant mobility phenomena: the distinct access paths to a territory, the groups of persons that move together in space and time, the regions of a territory that contains a high density of traffic demand, etc. All these paradigmatic perspectives focus on a collective view of the mobility where the interesting phenomenon is the result of the contribution of several moving objects. In this chapter, the authors explore a different approach to the topic and focus on the analysis and understanding of relevant individual mobility habits in order to assign a profile to an individual on the basis of his/her mobility. This process adds a semantic level to the raw mobility data, enabling further analyses that require a deeper understanding of the data itself. The studies described in this chapter are based on two large datasets of spatio-temporal data, originated, respectively, from GPS-equipped devices and from a mobile phone network.
Impacts of Electric Mobility on the Electric Grid
Authors: Fraile-Ardanuy Jesus , Ramirez Dionisio , Martinez Sergio , Alvaro Roberto , Gonzalez Jairo , Knapen Luk , Janssens Davy
Published: October 2013

Electric mobility is becoming an option for reducing greenhouse gas emissions of road transport and decreasing the external dependence on fossil fuels. However, this new kind of mobility will introduce additional loads to the power system, and it is important to determine its effects on it. As a direct scenario from DATA SIM FP7 EU project, an application related to electric mobility and its impact on the electric grid from Flanders region is presented in this chapter. The chapter begins with a brief description of the electric transmission network for Flanders region and the electric vehicles energy requirements for different mobility zones in this region, obtained from FEATHERS, an activity-based model. In the following section, the main assumptions that allow estimating the total electricity consumption for each mobility area is presented. Once this total consumption per zone has been estimated, an algorithm to link the mobility areas with the nearest substation is developed. Finally, the impact of charging electric vehicles on the transmission substations is examined.
A Numerical Approach of the Influence of Elliptic Inclusions on the Dynamic Behavior of One End Supported Beams
Authors: Lelis J.M. Rodríguez , Aguirre J.S.A. Méndez , Meza D. Alemán , Cabrera J.A. Arellano , Ledesma M.A. Ornelas , Lozano J.L. García
Published: October 2013

Composite structures offer lighter weight and higher strength and stiffness than most metal materials. The composite structures are increasingly applied in areas such as automotive and aerospace engineering among others. From the different types of composite materials, elliptical inclusions particulates provide an opportunity to control the stiffness and damping as a function of the ratio of the larger to shorter axis, orientation and size. In this paper we present a first evaluation of the effect of elliptical inclusions in the vibration modes of a beam single supported. Here, we can see that for inclusions with the major axis oriented parallel to the axis of the beam, the maximum stresses tend to be higher, while the frequencies and offsets remain similar.
A Study on Fault Detection Algorithm for Motor Control Unit of Electric Vehicle
Authors: Seo Dong Hyun , Shin Wae Gyeong , No Jong Sang
Published: October 2013

Algorithms for motor control unit in electric vehicles are being actively developed with consideration given to safety and reliability these days. Faults during driving are a critical problem that is directly linked to the safety of drivers, and studies on fault detection of control units in various situations are needed. This study investigated the faults of control units in a signal level interface with a dynamic model of drive motor and the real-time interconnection of motor control unit and HILS (hardware-in-the-loop simulation). It was found through real-time simulation that simulating the fault conditions with the sensors of motor control unit could reveal different characteristics of motor control unit. Furthermore, vehicle driving simulations with electric motor control were performed. The results of this study are expected to help the development of electric motor simulations and the evaluation of MCU and control algorithms.
Application of Neural Network in Duration Implicit Cost Control for Construction Projects
Authors: Shao Bi Lin , Wang Li Qing , Wu Qiong
Published: October 2013

According to the characteristics of construction project, it set the third level of duration implicit cost, deepening the understanding of the duration implicit cost in construction project. Through analyzing the similar characteristics of the technique of project network diagram and neural network, it built a duration implicit cost control model based on neural network, which can adjust the project network diagram to the optimization direction. Aiming at the defects of the traditional neural network, the variable learning rate back-propagation arithmetic and the additional momentum method were introduced, and the duration implicit cost control model was built, improving the accuracy of the control for the neural network technique.
Monte Carlo Simulation and Artificial Neural Network Modeling of Ferro-and Antiferro-Transition Behavior in Two Dimensional Binary Alloy
Authors: Laosiritaworn Wimalin , Laosiritaworn Yongyut
Published: October 2013

This work investigated the competition effect between the ferro-and antiferro-interaction on the domain size and domain interface in two-dimensional binary alloy. Monte Carlo simulation and Ising model were used to model the alloy system where largest domain size and the domain interface were observed to identify the low temperature ordered phase and the high temperature disordered phase. The simulation results show that domain size is maximized when the ferro-interaction is preferred, but domain interface becomes maximum instead when the antiferro-interaction is favored. These domain properties were reported as a function of temperature for various magnitude of ferro-and antiferro-interactions. In addition, the artificial neural network was used to create database of relationship among the ferro-and antiferro-interaction, the simulated temperature and the domain properties. Good agreement between the real targeted outputs and the predicted outputs was found, which confirm the learning-by-example ability of the artificial neural network. This work therefore presents another step in the understanding of how complex interaction plays its role in binary alloy problem and how a data mining technique assists development of understanding in materials science problems.
Machining Method for Cycloid Approximating Involute and Straight Lines
Authors: Wang Li Ping , Tang You Hong , Dong Jiang Hui , Ge Xiu Guang
Published: October 2013

A universal mathematical model for machining cycloid approximating involute and straight lines is developed in this study based on the definition and parameter-equation of cycloid and the machining principle of cycloid rotational indexing. The machining examples of the various parts are presented to show the feasibility of this model.
Free Vibration Analysis of Fluid-Filled Elliptical Cylindrical Shells
Authors: Xiong Lu , Li Tian Yun , Zhu Xiang , Zhu Xian Ming
Published: October 2013

A method is presented for the free vibration analysis of finite fluid-filled elliptical cylindrical shells with variable curvature. Based on the Goldenveizer thin-shell theory, the vibration equations have been expressed as a matrix differential equation by using the transfer matrix and the fluid-loading term is represented as the form of Mathieu function, the transfer matrix is determined by use of the mid-Magnus series method. The natural frequencies are calculated numerically in terms of the matrix elements with a combination of appropriate initial guess and Lagrange interpolation method. The results of the degradation model obtained by the present method are compared to those of existing literatures. It is shown that the present method is highly accurate and the results are reliable. The sensitivity of the frequency parameter to the ellipticity parameter and the length of the shell are investigated respectively.
EMC Quantity Technologies for Operators' Radiation Safety of Aircraft
Authors: Hu Xiu , Jia Yun Feng , Li Hong , Wu Liang , Ma Chao , Long Tao
Published: October 2013

This paper presents a method of calculating the degree of EMC-Balance which used to characterize the EMC of the system to solve the problems of the absence of effective methods for pre-view design and the expensive rectification of EMC that always presented in the traditional system-level of EMC in later stage. The quantitative evaluation of operators radiation safety can be achieved by analysing theradiation characteristics of various equipments with the means of weighted summing of discrepancies between the the limits of design requirements and the datas which acquired from themeasurements or simulation results, to reflect the grade of system-level EMC-Balance directly in numerical form. The method can reflect the EMC of operators radiation safety timely during stages of design, development, production, used and maintenance of the systems on the aircraft. It also provides a kind of means of EMC process control during the whole life of the aircraft.
Evaluation Research about the Post Environmental Impact Assessment of Cascade Hydropower Engineering which Based on Matter-Element and Analytic-Hierarchy Coupling Model
Authors: Tang Bin Bin , Liu Bao Chen , Deng Zhi Hua
Published: October 2013

The environmental post evaluation index system is proposed to evaluate the cascade hydropower project`s post environmental impact assessment. We also constructed an evaluation method based on Matter-element and Analytic-hierarchy coupling model (FME-AHP) to apply to the environmental impact assessment of Yuan Shui cascade hydropower stations. It can test the index system and evaluation method is scientific and validity or not. We hope we can provide some experience and reference for the environmental impact assessment of the hydropower exploitation in key river basin both in China and abroad.
Research on Teaching Reform of Mechanical Vibration Course
Authors: Xia Zhao Wang , Fang Yuan Yuan
Published: October 2013

In order to cultivate high-quality professional talents, this paper analyzes the "Mechanical Vibration" course, teaching practice teaching reform made several comments on the ship and ocean engineering professional teaching based on the syllabus of "Mechanical Vibration" course. Teaching reform improves the students' interest, because of it emphasis on experiment teaching, especially in special engineering technology.
Statistical Energy Analysis of Fractional Derivative Model-Based Rubber Vibration Isolating System
Authors: Yang Qiao , Chen Hai Bo , Wang Yong Yan
Published: October 2013

The fractional derivative model and Coulomb friction model are introduced to describe the nonlinear characteristics of rubber isolators. Then the non-conservative coupling theory is used to calculate the statistical energy analysis (SEA) parameters of a typical non-conservative coupling system formed by two square plates and a rubber isolator. Numerical results are compared with those obtained by using the traditional viscous damping model, which shows that higher accuracy can be obtained by using the fractional derivative model in high-frequency band.
Convex Curve Compensation in High-Speed Corrugating Roll Based on Finite Element Analysis Method
Authors: Wu Bin Fang , Yuan Bo , Yuan Yu Jin , Wang Tian Bao
Published: October 2013

To discuss the dynamic characteristics of the height of high-speed corrugated roller mechanism, the mathematical model of the corresponding upper and lower corrugator roll is established , introduce the corresponding convex curve equation. By theoretical calculation,we got 6 groups of upper and lower height of the corrugated roller. Use ANSYS to simulate the working state of the corrugated rolle and establish finite element model to analyze force on the corrugated roller load, geometric constraints, thereby gaining the simulation status under 6 groups of height in the upper and lower corrugated roller. Compensate the results of theoretical calculation of the simulation conditions of convex curve and improve the contact performance of the corrugated roller .
Internal Flow Study of Diesel Fuel Filter
Authors: Li Jian Feng , Ling Jun Hua
Published: October 2013

The size and the number of folds severely affect the performance of the diesel fuel filter. Computational fluid dynamics method was applied to diesel filter internal flow simulation, and flow pressure lost was test to verify the simulation result. CFD result shown that, when the filter paper angle less than 3°, the internal flow resistance of fuel filter grown rapidly. The flow resistance decreased slowly when filter paper angle of greater than 6°. If filter paper angle was less than 3 °, effective filter area of filter decreased sharply, and filtration efficiency was lower than limit. The filter paper dust capacity increased rapidly, when filter paper angle was greater than 4.5 °, which prolonged filter life. In order to ensure the flow resistance, filtration efficiency and service life, the angle of the filter paper should be between 3 ° to 4.5 °.
Evaluation Model of the Supporting Plate of the Steaming Bucket Based on Fuzzy Comprehensive Evaluation
Authors: Chen Lei , Liu Yu Cong , Yang Chang Niu , Huang Wen Quan , Sun Ze Gang
Published: October 2013

To solve evaluation problem of the structure design of the supporting plate of the steaming Bucket, a evaluation method based on fuzzy comprehensive evaluation was presented for the Supporting Plate. Membership functions for the quantitative and qualitative indicators were built by using the fuzzy statistical test method and fuzzy distribution. On the basis, the evaluation model was built based on fuzzy comprehensive evaluation, each layer of which was evaluated respectively, and suggests the evaluation results of structure analysis of the supporting plate. The instance analysis shows that the method is reasonable and effective.
Analysis on the Influencing Factors of Dynamic Characteristics for the Linear Motion Station of DCG
Authors: Li Xiao Peng , Ju Xing , Zhao Guang Hui , Liang Ya Min , Yang Hao Tian
Published: October 2013

Dynamic characteristics of the system have been given more and more attention so as to improve the retention and reliability of machining accuracy. Research has shown that dynamic performance of the feed drive mechanism has significant impact on the processing quality and efficiency of CNC. This paper mainly focuses on the DCG which realizes its motion on the basis of a pair of lead screw. The dynamic performance of the DCG was analyzed by the method of finite element analysis. DCG structure and the key design parameters of the rail joint surface have been studied to find out the influence on its dynamic characteristics. These researches provided a basis for the realization of the CNC feed motion of high-speed and high-precision. Besides, it is also possible to improve the overall performance of CNC machine tools.
Simulation of Air Distribution on Inlet Section of Wet-ESP
Authors: Gao Ying , Wei Juan , Yang Xing Chun , Li Qiang
Published: October 2013

Based on the theory of two-phase flow, the flow field of dust particles inside the wet electrostatic precipitator with SIMPLE algorithm was modeled used a standard turbulence model and simulated numerically. Establishment of finite element model for the entity porous plate was done with grid refined locally. The number and installation position of porous plates, the diverging angle of the horn inlet and the opening rate of air distribution plates were changed in this simulation. And the studies on the airflow distribution of the inlet section were performed, in which the flow of key parameters for air flow uniform distribution are given. The experimental verification of optimal results of simulation model suggested that the simulation results and the experimental results were coincident.
Analysis of Transmission Performance of Helical Gear Based on High-Order Modification Design
Authors: Yang Jian Jun , Wang Jian Jun , Mao Shi Min
Published: October 2013

Flank modification is widely used in helical gear to diminish contact stress and edge contact, to improve the transmission performance. In this paper, tooth contact analysis is used to simulate the modified helical gear driver with high-order parabolic modification curve. The results show that the transmission error is diminished, and the meshing area is non-sensitive to the alignment errors.
The Stability and the Computed Speed of Boundary Element Numerical Method for Electric Field Intensity Generated by Oblique Hundred-Needle Electrodes
Authors: Wang An Ling , Liu Fu Ping
Published: October 2013

According to the electric field intensity of oblique hundred-needle electrodes (OHNE), the discrete equations based on the indetermination linear current density were established by the boundary element integral equations (BEIE) The non-uniform distribution of the current flowing from hundred-needle electrodes was imaged by solving a set of linear equations. Then, the electric field intensity generated by OHNE at any point can be determined through the boundary element method (BEM). The time of program running and stability of computing method are examined by an example. It demonstrates that the algorithm possesses a quick speed and the steady computed results. It means that this method has an important referenced significance for computing the potential generated by OHNE, which is a fast, effective and accurate computing method.
Investigation on Similar Law of Drag Reduction Performance of Supersonic Vehicle Induced by Laser Energy
Authors: Li Qian , Hong Yan Ji , Fang Juan , Wang Dian Kai
Published: October 2013

Wave drag is high when vehicle flights in supersonic, which impacts on aerodynamic performance of the vehicle heavily, so how to reduce wave drag becomes an important problem which needs to be solved. As an active-controlling technology on flow, drag reduction by laser energy deposition has been paid more and more attention to by researchers. Based on Euler equations, mechanical model and numerical method of drag reduction induced by laser plasma are established. Effect on drag reduction performance of hemispherical blunt body of laser energy, blunt size, temperature and pressure of surrounding gas is studied. A dimensionless energy factor is extracted according to numerical results. Results indicate: drag reduction percentage increases with dimensionless energy factors increasing when dimensionless energy factor is less than 0.7; when dimensionless energy factor is greater than 0.7, energy will reach saturation, and drag reduction percentage keeps constant approximately; power efficiency decreases with dimensionless energy factors increasing. Therefore, similar law of drag reduction performance by laser plasma is obtained preliminarily, which provides possibility for reliable amplification of drag reduction by laser energy deposition.
Unsteady Hydrodynamic Performance Prediction of Ducted Propeller Based on CFD
Authors: Ou Li Jian , Wu Nan Huo , Li De Yu
Published: October 2013

Firstly, the calculated model was created in UG and GAMBIT, and then the Moving Mesh method was adopted to simulate thrust and torque of ducted propeller using FLUENT in the open water. The thrust, torque and bearing force of ducted propeller in three different wake fields were calculated. And the influence on the performance of ducted propeller by the wake fields was analyzed.
3D Finite Elemental Analysis on Treatment of Sacral Fractures with Different Internal Fixation Implants
Authors: Wang Jian Ping , Liu He Jia , Sun Shao Kai , Jian Shi He
Published: October 2013

To provide the doctors a basis for treating sacral fractures and offer optimal surgical program, three-dimensional (3D) finite element method was used to simulate normal pelvis and the unstable pelvis sufferedIsection, IIsection and III section sacral fracture respectively.The unstable pelvises were respectively fixed with five different internal fixation implants types, which are respectively rectangular plate with cannulated screw, rectangular plate with solid screw, expansile bolt, convex plate with cannulated screw, convex plate with solid screw. The stress distribution and the X, Y, Z direction displacement of the sacrum were calculated for each sacral fracture treatment of five internal fixation implants after giving 500N axial load on lumbar vertebra and were compared with the normal pelvis, then the optimal surgery program were determined. After the analysis, by comparing the five combinations for each sacral fracture treatment of five internal fixation implants, the preferred combinations for the reset treatment of theIsection sacral fractures were rectangular plate with cannulated screw and convex plate with cannulated screw; The preferred combination for the reset treatment of the II section sacral fractures was expansile bolt; The preferred combination for the reset treatment of the III section sacral fractures was convex plate with cannulated screw.
Design of Automatic Mixing System for Water Treatment
Authors: Xiao Zhi Jie , Yang Yi Yong , Wang Sheng Wen , Zhao Kang Ning
Published: October 2013

The excessive ammonia nitrogen ions and nitrate in the domestic water and industrial water have seriously detriment of health of human being. The application of optimization solution for water purification is a main method to analyze the function of water purification device. In this paper, an automatic mixing system is designed to analyze the performance of ion-exchange column using LabVIEW. This system can solve the problem such as discontinuous proportion, complicated operation and low proportion precision which exists in the current proportion device. The accuracy of over 97% is shown by the experimental results in this study and it is also found that the quality of water can satisfy the requirement of drinking water.
Research on the Quantitative Method of Brazed Diamond Tool Wears Characterization
Authors: Qian Long , Feng Ping Fa , Zhang Jian Fu
Published: October 2013

A quantitative method which is named as ‘Wear Area Method’ (WAM) is proposed to characterize the brazed diamond tool wear in this paper. To different diamond grain forms, we present different definitions of their wear area. And with above foundation, the concept ‘Tool Wear Rate’ (TWR) is defined to describe the wear level of tool. Then we propose a corresponding measurement way which depends on the SEM photos and software Image pro plus to get the wear area. Finally, we set a face grinding experiment of sapphire to confirm the availability of this new method.
Feasibility and Safety Dynamic Requirements Analysis of Space Resources On-Orbit Repurposing by Robotic Spacecraft
Authors: Zhou Min Qi , Zhang Ya Sheng
Published: October 2013

The concept of Space Resources On-Orbit Repurposing (SROOR) is generalized by presenting the brief introduction of Phoenix Program. The feasibility of satellite bus components repurposing is analyzed, as well as the resources in geosynchronous orbit (GEO). Several safety dynamic requirements are studied and simulated. The conclusion suggests that SROOR is not only feasible but also needful and has broad application prospects.
The Comparison and Overview of Different Types of Wind Power System
Authors: Yang Hui Min , Li Yun Song , Wang Yong Liang
Published: October 2013

In order to choose a financial and suitable wind power system, the analysis of different wind power system is necessary. The paper reviewed several kinds of commonly used wind power system, given the topology structure same and different placesgenerator types respective advantages and disadvantages and applicable range of them. Compared and analysed direct-drive PMSG system and constant speed constant frequency SCIG system .Finally discussed the development trend of wind power generation system and the work emphasis in the future. It has certain reference value for research and choose of wind power system.
Parsing out of Infrared Thermal Imaging Temperature Field Based on BP Neural Network
Authors: Sun Zhi Zhong , Chen Xiao Lei
Published: October 2013

As a kind of infrared imaging equipment, thermal infrared imager plays an important role not only for military use, but also for civil. However, data of temperature filed cannot be obtained from thermal image directly. Accordingly, digital image processing technology and BP neural network were employed to analysis thermal image. Data of the whole temperature field were restored from the thermal image for further processing.
An Investigation on the Coupled Response of Vehicle Skutterudites-Based Thermoelectric Module
Authors: Liu Zi , Chen Gang , Peng Heng , Zhang Wei
Published: October 2013

Basing on that skutterudites-based thermoelectric module may be applied to the vehicle exhaust power generation system, a multi-field of thermal mechanical-electrical coupled model was established and investigated by finite-element method. The thermal stresses, open circuit voltage, output power and conversion efficiency of thermoelectric module (TEM) are calculated and obtained. The service environment is simulated with the hot side temperature data obtained by experimental measurements. An independent tank is adopted on the cold side, to develop a temperature difference for electric producing, and then achieve the thermoelectric conversion. By analyzing the working properties of TEM, the mechanical properties and thermoelectric characteristics are also discussed, which provides guidance for TEM practical application.
The Study of Radiation Coupling Characteristics of Monitoring Circuit Board Excited by Electromagnetic Field
Authors: Liu Wei Fang , Zhang Wei Dong , Cui Xiang , An Guang Pei , Wan Qian , Wang Zhi Xia
Published: October 2013

HVDC has been rapid development in recent years, but the problems of the electromagnetic compatibility of converter valve control circuit are becoming more and more prominent. In order to study the PCB anti-harassment problem, we study radiation coupling mechanism of monitoring circuit board. In order to simplify the model, firstly we study microstrip line using transmission line method, and then create a physical model of monitoring circuit board. Through simulation, we can acquire the induced voltage of the chip pins as well as the distribution of electromagnetic field around.
Analysis of Adsorption Mechanism of Anti-Balling Additive for Drilling Engineering on Metal Surface
Authors: Ma Cha , Yang Yu Ping , Li Long
Published: October 2013

Due to the repeated cracking caused by the adsorption of cuttings on the surface of drilling bits and BHA during drilling operation, the rate of penetration (ROP) could reduce remarkably. The anti-balling additive for drilling fluids (ABA) could eliminate the adsorption effect of cuttings, and increase ROP significantly. In this paper, the mechanism of eliminating the adsorption effect of cuttings was investigated in details. The results indicate that ABA can form multilayer chemical and physical adsorption on the surface of drill bits and BHA in the form of oriented adsorption of organic phosphine, which is of great importance to the design of drilling fluid system and field operation to raise ROP.
An Optimal Preview Acceleration Driver Model with a Correction Factor for Vehicle Directional Control
Authors: Guan Hsin , Zhang Li Zeng , Jia Xin
Published: October 2013

Parameters of the optimal preview acceleration driver model for vehicle directional control are determined by drivers delay/lag time and parameters of the reference model of the controlled vehicle. A moving vehicle is a time-varying and nonlinear system, so it is difficult to obtain accurate parameters of the reference model. If large modeling errors of the reference model occur, the classic driver model cannot ensure the driver/vehicle closed-loop system have a satisfactory performance. In this paper, an improved optimal preview acceleration model with a correction factor was proposed, which is based on sensitivity analysis and MRAC (the model reference adaptive control). Simulation results show that the improved driver model has more satisfactory adaptability and robustness comparing with the classic driver model.
Control Algorithm and Implement of a Bio-Robotic Fish Inspired by Stingray
Authors: He Jian Hui
Published: October 2013

This paper focuses on the hierarchical control system of previously developed robotic stingray that consists of PC, DSP and bottom controller, achieved direction control and velocity control of the biomimetic stingray like propulsor. Finally, an experiment was carried out to investigate the influence of fin kinematic parameters (such as frequency, amplitude and wavelength) on propulsion speed of the stingray, followed by variance analysis. The experimental results illustrate that the biomimetic stingray like propulsor works well under the control of the hierarchical control system.
Application of Siemens 840Di System in the Reconstruction of KISC Roll Collar Grinder
Authors: Wang Hai Rui , Li Ya , Wang Jian Ying , Liao Yong Yi
Published: October 2013

This work studies the reconstruction of high-speed roll grinder for sculptured surfaces with high feed rates. Experiments and predictions were focused on representative surfaces of dies and molds, whose geometric complexity and complexity distribution were modified parametrically. CNC programs for machining these surfaces were executed in a HERKULES HSF2CNC machining center with a SIEMENS 840D controller, with different levels of programmed feed rate. Discrepancies between programmed and actual feed rates were evaluated. A mechanistic approach for roll grinder in high-speed milling of sculptured surfaces is proposed. The mechanistic model construction is based on: (a) the frequency distribution of linear interpolation path lengths in the CNC program and (b) a characterization of the machine tool for brisk and smooth movements. Two case studies were used to demonstrate the effectiveness of the proposed approach. The reconstruction model is capable of the manufacturing.
Application of Mixed-Integer Programming and Dispatching Rules on Parallel Machine Scheduling with Inserted Idle Time
Authors: Tsai Chi Yang , Wang Yi Chen
Published: October 2013

This research considers the problem of scheduling jobs on unrelated parallel machines with inserted idle times to minimize the earliness and tardiness. The aims at investigating how particular objective value can be improved by allowing machine idle time and how quality solutions can be more effectively obtained. Two mixed-integer programming formulations combining with three dispatching rules are developed to solve such scheduling problems. They can easy provide the optimal solution to problem involving about nine jobs and four machines. From the results of experiments, it is found that: (1) the inserted idle times decreases objective values more effectively; (2) three dispatching rules are very competitive in terms of efficiency and quality of solutions.
Impulse Noise Filtering Algorithm Based on Dual Threshold Criterion
Authors: Wei Yu Lan , Li Bing , Li Jian Dong , Fan Ying Ying
Published: October 2013

In order to filter the impulse noise existing in the weld surface defect images, the traditional median filtering will dim image, even destroy some details in the image, We put forward a new filtering algorithm based on dual threshold Criterion. This way distinguishes the noise point and signal location in the first, and it only doing median filter to the noise point. Lastly, it solves the image’s boundary. We can find it when compared to the traditional median filtering and modified extremum median filtering, the way in this article can be good for filtration, and can keep the image’s details, which have obvious advantage.
Research on Shape Innovation of CNC Machine Based on Kansei Engineering
Authors: Zhang Xue Dong , Chen Mei Song
Published: October 2013

Through the analysis of concepts of Kansei engineering, the frame of CNC machine form innovation design is based on forward quantitative reasoning type of Kansei engineering. This paper selected 40 pictures of representative CNC machine and 6 pairs of adjectives concerning evaluation of other feeling, conducted related investigations, and used SPSS17.0 statistical software for statistical analysis of survey data, provided the basis for the guidance of NC machine s form innovation and design evaluation through the research, so as to better meet the emotional needs of consumers.
The Analysis of the Standardization in Signage System Design
Authors: Yang Xiao Yang
Published: October 2013

This paper analyzes the principles of signage system design, especially the principle of standardization and how to use it to improve the design. Except the study about the elements of system, this paper also analyzes the coherence of the whole system .This shows another perspective of the signage system design.