bluuebunny/crossref_metadata_2025 huggingface dataset:
MULTI-PERSON SELECTION OF THE BEST WIND TURBINE BASED ON THE MULTI-CRITERIA INTEGRATED ADDITIVE-MULTIPLICATIVE UTILITY FUNCTION
Authors: Bagočius Vygantas , Zavadskas Edmundas Kazimieras , Turskis Zenonas
Published: July 2014

Energy generation and savings is a vital problem for the social and economic development of a modern world. The construction of wind farms is a challenge of crucial importance to Lithuania. Offshore wind farms are one of the possibilities of the multiple use of marine space. Wind energy industry has become the fastest growing renewable energy in the world. An offshore wind farm is considered one of the most promising sources of green energy towards meeting the EU targets for 2020 and 2050. They provide long-term green energy production. The major purpose of this study is the selection and ranking of the feasible location areas of wind farms and assessing the types of wind turbines in the Baltic Sea offshore area. Multi-criteria decision making methods represent a robust and flexible tool investigating and assessing possible discrete alternatives evaluated applying the aggregated WSM and WPM method namely WASPAS. The following criteria such as the nominal power of the wind turbine, max power generated in the area, the amount of energy per year generated in the area, investments and CO2 emissions have been taken into consideration.
MANAGERIAL ROLES AND FUNCTIONS IN NEGOTIATION PROCESS
Authors: Kozina Andrzej W.
Published: July 2014

The paper is focused on negotiation processes performed in a company and presents author’s concept of the description of the roles and functions accomplished by managers within those processes and being of significant importance from the point of view of negotiations’ outcomes. Such a concept aims at providing the analysis and conducting of business negotiations with effective support. Firstly (following introduction), the concept, types, and comprehensive model of such negotiations is presented as a useful methodological framework for specifying managerial roles and functions. Secondly, some classic concepts of those roles are reviewed, drawing special attention to the ones that concern negotiation process. Thirdly, general managerial functions within that process are described. Fourthly, those functions are precised by relating them to typical hierarchical levels. Fifthly, peculiar managerial functions within negotiating team are discussed. Finally, specific issue of the role of manager as a mediator is addressed. Summing up the paper, the crucial areas for subsequent research were pointed out. In order to elaborate the presented concept the author carried out the comparative study of negotiation literature as well as developed his original ideas.
THE IMPACT OF SUPPLY CHAIN COST ON THE PRICE OF THE FINAL PRODUCT
Authors: Lapinskaitė Indrė , Kuckailytė Justina
Published: July 2014

Nowadays, as consumption and production are growing enormously fast, companies are seeking for costs reduction aimed at ensuring competitiveness. In manufacturing companies, supply chain expenses play a colossal role in the cost of the final product. This paper focuses on the main processes in the logistics chain and their components. The authors analyse the relationship between the supply chain expenses and the price of the final product, the classification of logistics chain costs and their minimization as an assumption for the competitiveness of the final price.
IDENTIFYING PREDICTORS OF STUDENT SATISFACTION AND STUDENT MOTIVATION IN THE FRAMEWORK OF ASSURING QUALITY IN THE DELIVERY OF HIGHER EDUCATION SERVICES
Authors: Stukalina Yulia
Published: July 2014

Nowadays, the quality of educational services provided by a university is a crucial aspect of the education managers’ strategy in the customer-driven education context, quality assurance in education being an essential issue to be promoted in European higher education institutions. Students’ evaluation of the educational services (that is consumer-oriented assessment) can be regarded as one of the most significant educational management tools used for stimulating quality enhancement in a university. It is vital for supporting decision-making process. A special emphasis may be put on monitoring student satisfaction with the educational services and student motivation toward studies. Understanding the central factors that are supposed to influence and predict student satisfaction and student motivation may provide education managers with best possible solutions to improve quality of the educational services in a higher education institution. This paper presents the results of an empirical study performed in Riga Technical University. The study was aimed at identifying the basic determinants (predictors) of student satisfaction and motivation in the framework of the ESP (English for Specific Purposes) course.
Critical Comments on Current Research Agenda in Cyber Security
Authors: Schmidt Nikola
Published: July 2014

The following article presents an alternative critical perspective of the cyber security research agenda. The article opens with criticism of the securitization discourse that uses analogies of historical events with events in cyber space. The author argues that such an approach is inappropriate, and that events of such impact are very unlikely to take place. The events that have already shaped our way of thinking - such as the Estonian attacks - caused significant damage to the respective country; nevertheless, the very same attack today would not do the same harm, thanks to the different level of critical infrastructure in Estonia. Another example, Stuxnet, is also an event of high impact, but with a low probability of happening in the future. Due to the complexity of the supporting operation of the attack, it would not lead to a cyber world war. The future will bring more complex, less visible, completely covered and precise operations that will take advantage of all cyber space features, rather than a cybergeddon comparable to some historical event or a nuclear scenario. The author proposes three directions of desired research agenda in the cyber security field. Firstly, the development of normative framework aimed at a better understanding of cyber events; secondly, a thorough research of cyber space leading to appropriate space conceptualization; and thirdly, the reevaluation of cyber warfare concept in the light of the cyber space novelty.
Jaderná politika Spojených států po konci studené války: Vývoj v kontextu proliferace ZHN
Authors: Smetana Michal
Published: July 2014

WMD proliferation is often considered to be one of the gravest security threats of our time. This article aims to explore how the post-Cold War securitization of this phenomenon influenced the evolution of U.S. nuclear policy. The systemic change related to the collapse of bipolar world order is depicted as a major impulse which led to the need to redefine the role of American nuclear weapons. The conceptual shift from global to regional approach in U.S. foreign and defense policy as well as particular experience of the Gulf War brought about the emergence and subsequent institutionalization of a number of counterproliferation programs and initiatives, effectively serving as a new rationale for U.S. nuclear arsenal. In the context of U.S. nuclear policy of the first post-Cold War decade, the author identifies an inception of a number of still highly relevant strategic trends. These include qualitative improvements of nuclear weapons towards their greater practical usability in the new security environment, limited ballistic missile defense as a key strategic defensive element against WMD attack, emphasis on flexible nuclear planning or the formulation declaratory policy for nuclear use. A detailed exploration ofthe particular circumstances in which these trends appeared and have become an integral part of U.S. strategic posture is therefore a crucial prerequisite for deeper understanding of contemporary U.S. nuclear policy.
The Evolving Nature of the Armed Conflict in South Ossetia: From Frozen to Hot and Back
Authors: Shevchuk Zinaida
Published: July 2014

This article explores the conflict processes in one of the most volatile regions in post-Soviet space - South Ossetia. The objective of the analysis is to bring more nuanced and explicit distinction to the understanding of the heterogeneous nature of the armed conflict. By studying the evolution of issues at stake and conflict processes we can trace the pattern of conflict behavior. The study focuses on an assessment of the extent to which ethnicity is merely a convenient common dominator to mobilize ethnic groups in the struggle over resources, land, or power. This study rejects the common notion that the contemporary conflicts in the South Ossetia can be understood as "unfinished business" from the past ethnic conflicts that had been "frozen" under the communist regime.
The Security Question in the post-Mubarak Egypt:The Security Void in Sinai
Authors: Burgrová Helena
Published: July 2014

The article deals with the security situation in Egypt after the ousting of Mubarak's government in 2011. It addresses implications of the security void in the Sinai Peninsula, which are closely related to the failure of the Egyptian security forces to ensure security in this area. The focus is turned at the growth of violent attacks against security personnel and cross-border attacks aimed at Israeli targets. By comparing three periods - before the 2011 uprising; between the 2011 uprising and 2013 Mursi's deposition; and the period after Mursi's deposition on July 3, 2013 - the article maps changes in the pattern of violent conduct. It documents a significant rise of violence and intensification of Jihadist activities in the region after the uprising of 2011. Mursi's deposition triggered further intensification of violence in the region, as well as novel patterns of violence such as the use of sophisticated weaponry and methods of combat (e.g. suicide attacks). This change is linked to the expansion of the Jihadist agenda and the greater involvement of the Jihadist groups in the battle against the Egyptian security forces. The article suggests that the core of the security crisis is closely linked to negligence and marginalization of the local population by the government. Therefore, as long as Sinai is approached merely through firm security measures that fail to address the developmental needs of the locals, the security of the region cannot be guaranteed.
Koralni kodeksi koprske stolnice
Authors: Snoj Jurij
Published: July 2014

Koprska stolnica hrani sedem v kvadratni notaciji pisanih glasbenih kodeksov, ki izvirajo iz 14. in 15. stol. in vsebujejo glasbo za celotno liturgično leto (z izjemo oficijske liturgije od velike noči do binkošti). Liturgično vsebujejo obred rimske kurije oz. frančiškanskega reda. Kot kasnejši dodatek je v enem od njih celotni oficij sv. Nazarija, prvega koprskega škofa.
Prispevek k poznavanju repertoarja starejših muzikalij cerkvene glasbe v Sloveniji
Authors: Škrjanc Radovan
Published: July 2014

Prispevek v obliki sheme in uvodnega pojasnila povzema del izsledkov raziskave devetih arhivskih fondov muzikalij (po enega v Celju, Komendi, Mariboru in na Ptuju, dveh v Novem mestu ter treh v Ljubljani), ki so pomembni za poznavanje cerkvene glasbe 18. in 19. stoletja v Sloveniji. Gre za izsledke glede vrste in številčnega obsega različnih cerkvenih skladb skladateljev, ki – kolikor je znano – nikoli niso delovali na ozemlju današnje Slovenije, njihova dela pa so se v omenjenih arhivih ohranila bodisi v prepisu bodisi kot tiski, v več primerih tudi oboje.
Antonio de las Viñas y los Pérez de Guzmán. Sobre la “Ejecución y pinturas de ciertos lugares de España” en 1567: ¿las vistas de Tarifa, Zahara de los Atunes y Sanlúcar de Barrameda?
Authors: Cruz Isidoro Fernando
Published: July 2014

Documentamos la libranza de 50 ducados en 1567 del VII duque de Medina Sidonia, Don Alonso Pérez de Guzmán, a instancias de su tío Don Pedro Pérez de Guzmán, I conde de Olivares, al pintor Antonio de las Viñas, para la realización de ciertas vistas de lugares de España, que podrían ser las de Tarifa, Zahara de los Atunes y Sanlúcar de Barrameda, pues formaban parte de su señorío y están fechadas ese año.
Los Perolli en La Mancha: nuevas aportaciones
Authors: Barranquero Contento José Javier
Published: July 2014

Este trabajo aporta nuevos datos sobre la labor que desarrollaron dos miembros de la familia Perolli, Esteban y Juan Esteban, bajo el patrocinio del II Marqués de Santa Cruz, don Álvaro de Bazán y Benavides.
Acción técnica, interacción social y práctica cotidiana: propuesta interpretativa de la tecnología
Authors: Calvo Trias Manuel , García Rosselló Jaime
Published: July 2014

En este artículo se defiende el potencial del análisis tecnológico concebido como práctica eminentemente social. Esta perspectiva combina la información derivada de los análisis de las acciones y gestos técnicos con otros conceptos como el savoir faire tecnológico del grupo, los procesos de aprendizaje, las prácticas tecnológicas socialmente constituidas, etc. Esta estrategia metodológica permite adentrarse en el conjunto de praxis sociales que se van generando en el día a día de la fabricación y uso de los objetos e intervienen, de manera significativa, en la construcción de la arena social de las comunidades. Como caso de estudio de esta propuesta se citan ejemplos de la producción de la cerámica a mano.
Mapa de usos potenciales de la tierra de Galicia. Una perspectiva arqueológica
Authors: Currás Refojos Brais X.
Published: July 2014

La cartografía de usos potenciales de la tierra es una herramienta de gran utilidad en el estudio de las formas de poblamiento y su relación con la explotación de los recursos agrícolas desde el enfoque de la arqueología del paisaje. La digitalización de esta información permite su aplicación sistemática en el análisis del territorio mediante SIG. En este trabajo se presenta el Mapa de usos potenciales de la tierra de Galicia, reclasificado en tres tipos establecidos en función de criterios históricos. Se muestra el procedimiento analítico desarrollado para la selección y clasificación de los tipos de tierra y su sistema de digitalización. Se examina la validez de esta fuente para la investigación arqueológica de las formas agrícolas en la antigu.edad desde el punto de vista del análisis del territorio y se ofrece una visión crítica sobre sus ventajas y limitaciones.
Aportaciones hidrogeológicas al estudio arqueológico de los orígenes de la Edad del Bronce de La Mancha: la cueva monumentalizada de Castillejo del Bonete (Terrinches, Ciudad Real, España)
Authors: Benítez de Lugo Enrich Luis , Mejías Moreno Miguel , López Gutiérrez Julio , Álvarez García Honorio Javier , Palomares Zumajo Norberto , Mata Trujillo Enrique , Moraleda Sierra Jaime , Menchén Herreros Gabriel , Fernández Martín Sergio , Salazar-García Domingo Carlos , Odriozola Lloret Carlos , Benito Sánchez María , López Sáez José Antonio
Published: July 2014

Estudios recientes indican que las motillas, asentamientos de la Edad del Bronce de La Mancha, pudieron ser las más antiguas captaciones de agua subterránea en la Península Ibérica. Pero ¿por qué no existen motillas en el Campo de Montiel, territorio ubicado tradicionalmente en esta área cultural? En Castillejo del Bonete, sitio arqueológico situado en esa comarca, existe una cueva que fue utilizada y sellada durante la Prehistoria Reciente. Se presenta ahora la primera investigación paleohidrogeológica interdisciplinar en La Mancha, que ha analizado manantiales y niveles de agua subterránea del acuífero de Campo de Montiel, así como el interior de la sima de Castillejo del Bonete. Las conclusiones avanzan una relación entre el sustrato hidrogeomorfológico y la distribución espacial de las motillas. Además permiten descartar que la sima de Castillejo del Bonete fuera utilizada como mina o como acceso al acuífero, dos de las hipótesis de trabajo planteadas. De ese modo cobra fuerza que Castillejo del Bonete fuera un excepcional monumento funerario y simbólico durante el Calcolítico y la Edad del Bronce, perteneciente a una nueva clase de asentamientos desconocidos hasta ahora en el grupo cultural de la Edad del Bronce de La Mancha.
Behavior and Construction of Stay Cables in Shiyan Stadium
Authors: Zhu Li Ming , Zhu Zheng Hao , Kang Chao Jie
Published: July 2014

The construction of stay cable is the key technology problem in large span spatial structures. This paper carried out a study on the construction scheme of stay cables based on the practical project of Shiyan stadium roof. The loss of tensile force caused by the seven steel wring with different construction order is summarized according to the experimental construction, and the tensile force slacken analysis method was used to calculate the stress of construction. Moreover, the loss of tensile force caused by anchor and relaxation is considered too. Then, the control tensile force of construction, which is used to realize the tensile construction one time, is obtained. Results of the engineering test show that the construction process is simplified and he construction scheme is economic under the condition of allowed precision. The method can provide reference for similar projects.
Comprehensive Evaluation of Safety for Bored Pile Construction of Chishi Bridge
Authors: Zhu Zi Qiang , Feng Xiong Hui , He Xian Qi , Lu Guang Yin
Published: July 2014

Chishi Bridge is seated on Carboniferous limestone and Carbon limestone in which karst is strongly developed. Based on analysis the characteristics of the construction of bored Pile an geology, a scientific safety assessment system is the established and Fuzzy AHP(Analytic Hierarchy Process) is used to conduct a comprehensive safety assessment. The results are accordant with the actual and good results can be achieved. But in practice same new situation may be meted, the evaluation system suit be improved and supplement constantly to make the system more perfect.
Population Transfer in Multilevel System via Modified Stimulated Raman Adiabatic Passage
Authors: Shu Xiao Qin , Deng Chi , Kuang Ye , Yang Jian Hui , Liu Yi Ding
Published: July 2014

During the STIRAP process, the intermediate levels will have notable population which is detrimental if these levels could decay to other levels through spontaneous emission. Here, we propose a novel method which could reduce the intermediate level population during the STIRAP process. A complete population transfer could be achieved in this modified STIRAP even if the intermediate level could decay to other levels.
Research of Rockburst Prediction and Control Technology
Authors: Sun Wei Fang , Bian Xi Chun , Qi Xian Yin , Zhang Bin , Wang Yuan Jie
Published: July 2014

The paper analyzed the cause of rockburst, indicating that the risk came from hard and thick strata of roof, folding structure, fault, coal pillar and advance speed. Meanwhile SOS micro-seismic monitoring system and KBD5, KBD7 electromagnetic radiation meter was applied to monitor and measure the bumping danger zone. Corresponding to the unloading blasting and water softening, effectively avoid the occurrence of percussive ground pressure to ensure the safety in production.
A Calculation Method Based on Tension Distribution and Temperature Compensation for Sliding Cables
Authors: Zhu Li Ming , Yu Fu Dong , Zhu Zheng Hao
Published: July 2014

The calculation of sliding cable is difficult because it can dynamically pass through prescribed nodes and the length is variable. In order to solve the above problem, a calculation method based on tension distribution and temperature compensation for sliding cables was put forward. At first, the sliding cable was supposed to be fixed cable and the internal force of each cable segment was calculated. Then, the unbalanced tensions between neighboring cable segments were distributed to make the tensions equal. And then different temperatures were applied to the corresponding cable segments, which could cause temperature stress to compensate the unbalanced tensions between the initial calculated tensions and distributed tensions. At last the calculation was carried on again after applying the temperature to each cable segment. Moreover, an example was presented to verify the precision and validity of this method. The results show that the calculation method based on tension distribution and temperature compensation for sliding cables is effective.
Numerical Modeling of Lateral Earth Pressure Acting on Box Culvert under the Ground Deformation
Authors: Xia Jun Wu , Dou Guo Tao , Wang Di , Lu Zhen Hua
Published: July 2014

Box culvert affected by mining subsidence is exposed to damage potential in relation to the lateral earth pressure. This study intends to specify and compare different ground deformation by the mining subsidence effect in box culvert. For this purpose, a finite-element software (ANSYS) is used to generate models incorporating the soil and a box culvert. The results shows that the lateral earth pressure of box culvert was related to the way of ground deformation, In addition, the kind of soil also affected the distribution and value of the lateral earth pressure.
Numerical Simulation of Gas Transportation in Mechanized Top-Coal Caving with Gob-Side Entry Retaining
Authors: Li Sheng , Li Jun Wen , Zheng Guang Yan , Ma Nuo Nuo
Published: July 2014

To solve the problem of gas accumulation in thick-seam top-coal caving mining face, goaf gas migration equations were established based on seepage theory and the law of mass conservation. Taking No.7602 working face of Wuyang coal mine as the study object, gas migration rules of goaf in ventilation of U + I and Y+I were simulated by Fluent, and comparative analysis and verification were carried out by in-situ monitoring data. Test indicates that after gob-side entry retaining, average gas concentration value of No.7602 working face Return airway decreased by 39% compared with similar working face, decreased by 39% in gas emission roadway, decreased by 42% in upper corner. Ventilation of U + I can successfully resolve the problem of gas accumulation in upper corner and working face. The conclusion has a good instruction value to gas control in thick-seam top-coal caving mining face.
Evolution Characteristic and Reclamation Potentiality of the Muddy Coast in Jiangsu Province, China
Authors: Chen Jun
Published: July 2014

The study area was located in central coast of Jiangsu Province, China. The coast between Wanggang estuary and Chuandonggang estuary belonged to a typical accumulation muddy coast. When the Yellow River flowed into the Yellow Sea using the Huai River course, the coast deposited rapidly and the coastline advanced to the sea about 60 km. The deposition source stopped after the Yellow River returned to the north and flowed into the Bohai Sea. The entral coast of Jiangsu still maintained a high deposition rate in the supratidal zone because of the erosion supply of the abandoned Yellow River delta. But the subtidal zone was in the erosion state. The coast entered into the adjustment period in the 21st century and showed the equilibrium of the erosion and deposition. In recent years, the supratidal area decreased because of the reclaimation. The living space of the salt marshes was limited. The reclamation potentiality will be limited too in the future.
Study on Ionospheric TEC Effect during the Magnetic Storm on August 5th,2011
Authors: Li Shu Hui , Peng Jun Huan , Wang Shu Qing , Peng Yun
Published: July 2014

Using GPS observations, this article studied the global TEC’s effect and its variation characters during the magnetic storm on August 5th, 2011. Results show that after sudden commencement and deep main phase of the magnetic storm, there are strong positive ionospheric TEC disturbances in the area along middle and low latitude with local time of 12:00 at noon. Besides, compared with TEC reference value, the maximum increase values are respectively 21.26 TECU and 25.29 TECU. TEC’s abnormal decline appeared in some area of high latitude at mid night on the northern semi-sphere. The analysis results reflect that the ionospheric disturbances are dependent on the local time. Moreover, observations on the BRMU GPS station show that the rate of TEC (ROT) rose and fell quickly, and its standard deviation ROTI index increased from less than 0.5 TECU/min to lager than 1.5 TECU/min, which meant that TEC temporal and spatial gradient had become larger and larger during the storm. The global ROTI map reflects the strong irregularity of the ionosphere density structure in the high-latitude area with higher time resolution in case of storm sudden commencement, and the maximum value rose up to 6 TECU/min. Then, the ionospheric irregularity appeared in wide area of the globe after noon.
Effect of Guide’s Acoustic Parameters on Vertical Directivity of the Marine Ambient Noise
Authors: Meng Chun Xia , Mu Hao , Li Gui Juan
Published: July 2014

The vertical directivity characteristic of ambient noise is one inherent characteristic of the ocean in shallow water. And it includes the information of guide’s acoustic characteristic information. The marine guide is composed of sea water; seabed and surface boundary, there into, the acoustic parameters of seabed are hardly obtained exactly. In this paper, the model of vertical directivity for ambient noise is established. Based on the ray theory of sound propagation, the influence of guide’s acoustic parameters which include sound speed, density and attenuation coefficient on vertical directivity of marine ambient noise is simulated. The results are propitious to analysis and command the characteristics of ambient noise, and valuable to accelerate the exertion of acoustic equipment performance.
Architecture of Enterprise Information System for Electric Equipment Enterprise and its Implementation
Authors: Guo Xiao Jun , Yin Ying
Published: July 2014

Enterprise Information System (EIS) platform for electric equipment enterprise is presented in the paper. It is a comprehensive application platform, inclusive of CAX/PDM/ERP, and centered around PDM and ERP, which take main responsibilities. PDM is the basis of the information platform, and is responsible for integration of information from design and technology, and provides element product data for ERP. ERP is responsible for preliminary management information input, and material flow, and finance flow. PDM and ERP exchange information of database via an interface. Based on the J2EE platform, the EIS prototype is built. In the process of implementation of EIS, functionality module is constructed gradually. As an application demonstration, EIS for electric equipment enterprise is built in a very short time, and a distinct achievement is realized.
Overview of RFID Technology Based on Green Logistics in China
Authors: Wu Chun You , Lan Lan , Ding Feng , Zhao Xu
Published: July 2014

In recent years, with the development of e-commerce, logistics is playing an increasingly important role in society. And the concept of "Green logistics" has been spreading, which stress higher demands on Chinese logistics industry. Business progress is inseparable from technological enhancement. RFID technology as the basis for Internet of Things, whose application in the logistics industry will have tremendous prospects. The article aims to provide discussions on the establishment and improvement of the information system for Chinese logistics industry by the introduction to causes, patterns, strengths and weaknesses of RFID practice.
The Application of OLAP in Logistics System of Steel-Production
Authors: Zhang Jing , Li Na , Yang Jie , Lv Na
Published: July 2014

The cost control of Enterprises, logistics cost has become one of the important components. In this paper, based on SQL Server2000 database steel production logistics information multi-dimensional data set is established based on the on-line analytical processing (OLAP) base. The production logistics information data of steelmaking workshop in the data mining process come true, which will help enterpriser to make decisions.
Autobody Modelling Analysis of the Flying Cars
Authors: Wang Yue Fang , Su Tie Xiong
Published: July 2014

In this paper, the research situation of flying cars are introduced firstly. The autobody modelling influencas dynamic characteristics of the flying car. Some investigations are performed about the aerodynamic characteristics of the flying car.The key technologies that come from design demand and they are demonstrated secondly.Finally, the development of flying cars in the future are prospected and analysed.
Research on Process Planning Technology of Key Components of Underwater Production Facilities
Authors: Wu Zhi Xing , Zhang Nian Tao , Zhang Xian Zhen , Zhang Yu Kun , Zhao Lei , Zhang Qing
Published: July 2014

Due to the limitation of the manufacturing industry of our country, there is no specially Manufacturing and production base for underwater production facilities. Process planning technology is the key of building a set of complete manufacturing system of underwater production facilities. So the process planning technology of the key components of underwater production facilities is researched on the paper. And a process design system based on Creo2.0 is developed. The processing of the key components of underwater production facilities can be designed on this system.
Analysis of the Influence of Superelevation of Subway Line Act on Wheel-Rail Wear
Authors: Zhou Su Xia , Xue Rui
Published: July 2014

In order to reduce the wheel-rail wear and improve the safety and comfort of the vehicle during the running round the curve section, in this paper, based on the theory of vehicle dynamics and by the dynamics software-SIMPACK, it created a model on the relationship of wheel-rail. It conducted research on the three situation include deficient superelevation, normal superelecation and surplus superelevation when the train crossing the curves. It analysed the change regulation about the two parameters which are rate of wheel load reduction and overturning coefficient during running of the train. Most importantly, it analysed deeply about the regulation of the change about wear power and wear number accompanied by the change of superelevation. Two main conclusions were made in this paper. The first one is wear number and the changes of superelevation are negatively correlated. The second one is wear power and it is positively correlated. It suggested us that it should be in lower when the train crossing the curves. It should use lower deficient superelevation when it can’t in the case of the best situation.
Analysis of the Thermal Behavior of a Ball Screw Based on Simulation and Experimental Investigation
Authors: Li Zi Han , Fan Kai Guo , Yang Jian Guo
Published: July 2014

Thermal expansion of ball screw system affects the machining accuracy of machine tools significantly. The objective of this paper is to analyze the thermal behavior and predict the temperature variation pattern of a ball screw based on finite element analysis and experimental investigation. Wireless temperature sensors are used to monitor the temperature variation of the ball screw system under different thermal conditions during both the warm-up and cooldown phases, so as to investigate its temperature variation pattern. Then an exponential algorithm is proposed to analyze and predict the temperature variation of the ball screw based on finite element analysis, and the actual thermal boundary conditions of the ball screw system are exactly defined according to the proposed algorithm and the experimental results. Finally, it was found that the simulation based on the thermal boundary conditions identified herein could match quite well with the experimental results.
Dynamic Characteristics Analysis of Steam Generator Tube of Nuclear Power Plant by Finite Elements
Authors: Jiang Shuang , Cai Jun , Zhang Jing Wei , Sun Qiao Zhi , Guo Xin , Wang Yang Dong
Published: July 2014

In nuclear power plants, the steam generator heat transfer tube is the weakest part of the primary circuit pressure boundary. Flow induced vibration is one of the main reasons for the failure of the heat transfer tube. In this paper, an ANSYS finite element software is used to carry out the modal analysis of the heat transfer tube, and to simulate the dynamic response of the heat transfer tube in the harmonic load based on the modal analysis.
Effect of Preparation Conditions on the Performance of Electrodeposited Mo-Ni Coating
Authors: Liu Xiao Zhen , Shen Qin Wei , Luo Yi Fan , Liu Xiao Zhou , Chen Jie , Shu Qian Wei
Published: July 2014

Mo-Ni coatings were prepared on Ni alloy by electrodeposition method. The effects of electrodeposition temperature, current density, stir speed and electrodeposition time on deposition rate and microhardness of Mo-Ni coating were researched, respectively. Deposition rate of Mo-Ni coating decreases with the increase of electrodeposition temperature in 35 °C ~ 60 °C. Deposition rate and microhardness of Mo-Ni coating increases with the increase of current density respectively in 15 A/dm2 ~ 17.5 A/dm2. Deposition rate and microhardness of Mo-Ni coating decreases with the increase of stir speed respectively in 200 r/min to 400 r/min. Deposition rate and microhardness of Mo-Ni coating decreases with the increase of electrodeposition time respectively in 30 min ~ 40 min. When electrodeposition parameters: temperature 35 °C, current density 17.5 A/dm2, stir speed 200 r/mi, pH 5 and time 30 min, deposition rate and microhardness of Mo-Ni coatin are as high as 0.269 mg/ cm2·min and 502.4 HV respectively.
Lower Beam of the Heavy Isothermal Forging Hydraulic Press Compare between Rigidity Test and Simulated Result
Authors: Han Wen Jia , Bi Da Sen , Li Sen , Guan Ya Bin , Yang Guang
Published: July 2014

Hydraulic press occur elastic deformations in the working status. The deformation will affect the precision of the products. This paper expounds the method of using Laser tracker test rigidity of THP11-10000A isothermal forging hydraulic press. And we test the deformation of the lower bean, fit the date and compare with fitting of the finite element simulation results. The validity and the accuracy of the simulation results are verified.
Study on the Damping Characteristic of Semi-Active Torsional Damper Based on Combined Positive and Negative Stiffness
Authors: Li Hua , Liu Hui , Xiang Chang Le
Published: July 2014

The concept of semi-active torsional vibration damper based on combined positive and negative stiffness is derived and its working principle is discussed. Stiffness expression of parallel mechanism is established, and its elastic properties were analyzed. By establishing nonlinear dynamic model of the proposed damper, its dynamic characteristics are analyzed. The torsional vibration control effect of the proposed damper is better than the traditional dual mass flywheel type torsional vibration damper.
The Room Temperature Ferromagnetism of (N, Co) Co-Doped ZnO Nanopaticles
Authors: Cao Ping , Bai Yue , Qu Zhi
Published: July 2014

Co-doped ZnO nanoparticles were fabricated by an electrodeposition method. The XPS results show Co ions have doped into the ZnO crystal lattices successfully. The as-grown sample has no ferromagnetism at room temperature. But after an ammine plasma treatment the room temperature ferromagnetism were detected on Co0.04Zn0.96O nanoparticles. The Hall measurement reveals after the treatment the resistivity increase by three orders of magnitude. Although the aspect conductivity is n type, some holes generated by N doping play an important role to induce the ferromagnetic properties for Co doped ZnO sample.
The Dynamic Simulation Study of WN Gear Pair after Coupling Tribology
Authors: Li Yu Guang , Zhang Guo Qing
Published: July 2014

Based on WN gear characteristics and considering system error, a multi-degree-freedom (Tangential-Radial-Axial) dynamics analysis model after coupling friction was established. In this article, we established the three-dimensional solid model by using PROE and then imported WN gear’ three-dimensional model into Ansys software through the data interface of Ansys software and PROE software and conducted a three-dimensional simulation anasys of the impact of dynamic contact. By applying load, the stress analysis of WN gear was conducted and the WN gear’s the effective stress clouds was gotten. Meanwhile, basing on ANSYS / LS-DYNA, it established the rigid-flexible body of gear dynamic contact model and analyzed the dynamic simulation anasys of WN gear. The results demonstrated that the tangential and axial vibration of double arc gear was significantly greater than the radial vibration.
Vibration Control System of Precision Dicing Saw Machine Based on Neural Network Method
Authors: Ma Yan , Bai Xue Feng
Published: July 2014

The precision dicing machine is adopted as the research object in the paper, the technology of grating sensor is selected to overcome the shortcoming of traditional compensation methods for inaccurate return compensate. The measurement is done through the grating sensor, with the aid of neural network feedback method, the fitting and compensation of the data measured by the grating sensor is completed, the deviation caused by vibration during the spindle run-time is eliminated. And the purpose of improving the precision of spindle is realized.
Stress Corrosion Cracking of Stainless Steel Expansion Joint for Heat-Supply Network
Authors: Yang Feng , Zhang Ning , Song Yang
Published: July 2014

Tree-like transgranular cracks were found at the bottom of a expansion joint bellow that had been used for heat-supply network at 90°C and 0.8MPa. A failure analysis was conducted, including visual, microstructural, compositional, and mechanical characterization, to determine the cause and source of the degradation. Branched, brittle cracks were observed in the failure region and exhibited transgranular propagation. The results showed that the concentration of the chloride in the deposit was 248 ppm in the intermittent wet/dry cycles situation. It was determined that the likely cause of failure was neutral pH, Concentrated chloride-induced stress corrosion cracking.
Performance Analysis of Triangular Elbow Servo Press
Authors: Qiu Ying , Li Wei Min , Wei Zhi
Published: July 2014

The objective of this paper is to study performance of triangular elbow transmission mechanism for servo press. Then kinematics models are deduced and given. Kinematics curves along slider motion direction are drawn. Moreover, under the same driving condition, the effects of different link ratios on slider output motion are examined and compared with common six bar transmission mechanism in the article. Through motion curves comparison, it can be seen that this triangular elbow mechanism has significant force increasing effect and good quick-return characteristics. In addition, we carried on triangular elbow servo press virtual design and simulation. The case study provides more visual and reliable decision basis for designer. The results would be useful reference for optimization design of transmission mechanism.
Simulation and Experimental Research on Species in Direct-Injection Diesel Engine
Authors: Liu Yong Feng , Tian Hong Sen , Jia Xiao She , Pei Pu Cheng , Lu Yong
Published: July 2014

To simulate the combustion species for direct-injection diesel engines, the new flamelet model is presented and used. The model is based on stoichiometric mixture fraction space, and a way of separating the numerical effort associated with the solution of the turbulent flow field from that of solving the chemistry is offered. The new species equations are carried out through coordinates transformation. The results from the species equation are developed and three-dimension entity model with the mixture fraction is got. Then the boundary conditions are put into the new flamelet model. Furthermore the pollutions emissions are calculated and compared with the experimental data. It gives a new way to predict the pollutants for direct-injection diesel engine.
Simulation of 3-D Unsteady Flows in a Tubular Hydro-Turbine on DES
Authors: Ouyang Zhen Yu , Zhang Li Xiang
Published: July 2014

Taking a hydropower station as the research object, the establishment of a numerical model that contains the full passage Tubular Turbine is given. Based on the transient incompressible N-S equations, a three-dimensional unsteady flow research is conducted. Numerical simulation of steady turbulent flow channel is calculated as the initial condition, the detached eddy simulation (DES) and slip grid technology are adopted to simulate the static-dynamic interference in the unsteady turbulent flow, The instantaneous pressure distribution in full channel and vorticity distribution of the representive section are obtained, so the three-dimensional transient vortex structures in full flow channel of the hydraulic turbine are captured. These studies aiming to explore the mechanism for the formation of vortex-induced vibration of hydro-turbine are valuable for the engineering reference.
EFG-FE Couping Method
Authors: Wang De Hua , Gao Yu Jing , Wang Jing Ping , Xia De Chang
Published: July 2014

Element Free Galerkin Method is based on a set of nodes information construct the approximation function of meshless Method andit is not dependent on the grid. EFGM in civil engineering problems also played a huge potential.It through the establishment of civil engineering problem of EFGM model, through the EFGM-FE boundary coupling method to deal with problems, through the specific numerical example it is concluded that the EFGM-FE coupling method is effective and feasible.
A Study on Force Situation of the Coring Pipe Caused by Filling Lunar Regolith in the Drilling Process
Authors: Liu Tian Xi , Wei Cheng , Ma Liang , Zhao Yang
Published: July 2014

To find out the influence factors to the force situation of the coring pipe in the drilling process, the discrete element method is employed to build the lunar regolith model and simulate the interaction between soil and the drill. A viscoelastic contact model is introduced to represent the impact between particles. To make sure the validity of the model, a biaxial-test is conducted to optimize the micro-parameters of the model. The drilling process is simplified to an inserted process and the model after calibration is in use. From the computational simulation results, conclusions can be made: to reduce the drilling speed or to drill aslant may be good to decrease the force loaded on the inside wall. Enlargement of the diameter and thickness can improve the sampling efficiency and prevent the soil sample from being destroyed, and drilling aslant may be harmful to the sample.
Analysis and Comparison of the Models for the Rarefied Gas Effect on Gas Lubrication
Authors: Zhang Shuai , Song Peng Yun
Published: July 2014

Ultrathin gas film lubrication has been widely used in recent years, such as dry gas seal face gas lubrication, gas lubrication in the hard disk drive, etc. The rarefied gas effect must be considered when the gas film thickness is very thin. In order to analyze, compare, and select the appropriate rarefied effect model on gas lubrication, a comparative analysis has been carried out on the influence laws of the Poiseuille flow rate and the ratio of the effective viscosity coefficients and the dynamic viscosity, μeff/μ, with inverse Knudsen number, D ,or Knudsen number, Kn, as to different models. The results show that when inverse Knudsen number increases or Knudsen number decreases, the Poiseuille flow rate and the ratio of the effective viscosity coefficients and the dynamic viscosity,μeff/μ, of different models approach to each other. However, there are significant differences as to different models when the Knudsen number is large, and only several models from Hwang, Veijola, Peng etc agree with Fukui’s model.
Research on Screw Extruder Die Pressure and Speed Relationship
Authors: Gao Yuan Lou , Wang Lei , Zhou Li
Published: July 2014

This paper studies the variation of speed and pressure to achieve accurate control of the die pressure for screw extruder based on high viscosity PVC production. SolidWorks was used to establish the model of screw extruder, and then imported SolidWorks models into the ANSYS to analysis the relationship of speed and die pressure at the speed of 2rpm to 7rpm.It laid the foundation of establishing extruder pressure control system.
The Calculation and Analysis for the Independent Wheels of Tramcar
Authors: Ma He , Zhang Jun , Zhang Xiu Juan
Published: July 2014

The wheel/rail profiles in different wear stages are measured using the apparatus of wheel-rail profile. The 3D elastic-plastic FEM contact models are established for the straight line and curves, in which attack angle is considered. Contact problems between the wheels in different wear stages and the worn rail are studied. Contact area, normal contact force, and equivalent Von Mises stress of different cases are analyzed. The obtained results show that the maximum equivalent Von Mises stress reduces and tends to be steady with the independent wheel wearing. Widening the track gauge can have an influence on the variation of wheel wear positions and the wear rules between wheel and rail. When the wheel with a certain attack angle contacts with rail, the maximum equivalent Von Mises stress appears at the contact region between the flange and rail side. The influence of attack angle on the wear between the wheel and rail is quite serious. It is very important to do the research for the further optimization and design of the wheel/rail profiles.
Two-Dimensional Crack Growth Simulation under Mixed-Mode Loading
Authors: He Wen Tao , Liu Jing Xi , Xie De
Published: July 2014

In this paper, an efficient simulation program (FCG-System) is proposed to simulate 2D fatigue crack growth under mixed-mode loading conditions. The simulation is basically an incremental crack extension procedure. An object-oriented modeling frame is proposed for simulating fatigue crack growth of complex structures. The modeling frame is developed in the context of the commercial FE code ABAQUS, utilizing Python language and ABAQUS Scripting Interface (ASI). The highly automatic finite element simulation method is not only used for a single crack tip, but also has been extended to the system of interactive multiple cracks. The robustness and the accuracy of the new simulation code will be shown by two examples, including single crack growth and multiple cracks growth. Those applications indicate that the implementation of the FCG-System, as proposed herein, can be a useful tool for this class of fatigue crack growth.
An LED Green Light for New Plant Growth Cabinet Precise Temperature Control System
Authors: Wu Xing Li , Dong Jiang Lei , Liang Fan , Cui Shi Gang , Tian Li Guo
Published: July 2014

In the current, people pay more attention on food nutrition and security issues. In some places, the lack of farming land and land pollution leads to serious problem that people could not eat fresh vegetables. In order to solve these problems, "LED smart plant growth cabinet "came into being. As temperature is one of the most important control parameter that has the impact on plant growth, this paper describes a new type of temperature control system, and proposes simple, stable, precise temperature control method. In this paper we propose a new original two-dimensional temperature control strategy, which makes this cabinet has advantage over other domestic products. This paper describes the relationship between environment temperature and plant growth, and illustrates how the temperature control device works. In the experiment, we evaluated the advantages and disadvantages of this temperature control device.