bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison of Experimental and Computational Characteristics of Light Perimeter Walls of Wooden Buildings
Authors: Šuštiaková Marianna , Ďurica Pavol , Ponechal Radoslav , Cangár Marek
Published: October 2014

The paper evaluated thermo-technical characteristics of the experimental walls, consisting of five different tracks in three different color surfaces at different base material. The hygrothermal behavior of the structures and layers is monitored year-round. The computational model of the laboratory room and tested samples is compiled and debugged on the basis of experimental measurements. The dynamic simulations of temperature and humidity parameters were realized.
Contact Interaction between an Infinite or Finite Stringer and Elastic Semi-Infinite Plate with a Finite Vertical Crack Coming out to the Stringer by One End
Authors: Mkhitaryan Suren M.
Published: October 2014

Problems on contact interaction between continuous or discontinuous infinite stringer or with a stringer of finite length with an elastic semi-infinite plate, having a finite crack, which vertically comes out to the lower bound of the stringer, are considered. The edges of the crack are loaded by vertical to them symmetric forces, and the upper bounds of the stringers are loaded by symmetrically distributed tangential forces.
Analysis on Mechanical Characteristics of Important Components in Overlong Frame Structure under Overall Cooling Temperature
Authors: Zhao Chi Yun , Yu Guan Xiong , Zhu Bing Yin
Published: October 2014

In this paper, the overlong frame structure established by software ETABS was analyzed to find out its mechanical characteristics under the working condition of overall cooling temperature. The columns at the ends of the bottom storey, the beams and slabs in the middle of the first floor were the important components affected by temperature action. Various column cross-section sizes and forms as well as the storey heights to the reaction of the important components were analyzed through a series of finite element models. The key to reduce the temperature effects on overlong frame structure was reasonable design of frame columns at the end of the bottom storey, which are the smaller the cross-section stiffness, and the higher the bottom storey, the smaller the internal forces caused by overall cooling temperature in structural components. Some detailing structural measures were put forward to decrease the negative temperature effects.
Analytical Method of Determining Folded Depressed Shells’ Free Oscillation Frequency
Authors: Kondratyeva Lidiya Nikitovna , Routman Yuri Lazarevich , Maslennikov Alexander Matveyevich , Golykh Oleg Vladimirovich
Published: October 2014

The paper shows a conclusion and a solution of principal resolving equations of the motion of linear and geometrically non-linear theories of thin depressed shells with median surface breaks. A formula has been obtained for determining the shell’s free bending harmonic oscillation frequency in case of a hinge support on rigid diaphragms. Charts are supplied showing the dependence of free oscillation frequency on the change of different factors. A conclusion has been drawn concerning the analytical method efficiency.
Development of Green Engineered Cementitious Composites
Authors: Jašek Marek , Brozovsky Jiri , Mynarzová Lucie , Hurta Jan
Published: October 2014

A development of fiber-cement composites is often focused on cost-effective and environmentally friendly materials (so-called green materials). Production of this material should produce less waste and it also should use less energy and less natural sources. There are numerous approaches to the development of green composites. One of the possible ways is a utilization of fly ashes instead of the cement part of composite.
The paper discusses a development of green cementitious composite which incorporated fly ash materials produced in the Moravian-Silesian region as a partial replacement of the cement part of the composite.
Exploration Results of Applying Limestone Powder in Crushed-Stone-Sand Mixtures for Road Pavement Layers
Authors: Gyulzadyan Hakob , Voskanyan Gevorg , Ter-Simonyan Vigen
Published: October 2014

This paper presents results of exploration related to C2 and C6 crushed-stone-and-sand ready mixtures strengthened with limestone powder used in road pavement layers. Limestone powder is an industrial waste, which in Ararat region is in big volumes. The samples were taken composed of different fractions of crushed-stone and two types of sand produced from crushed basalt and crushed gravel, and were tested. The composition of ready mixtures meets the requirements of corresponding standard on grain size. To these mixtures limestone powder was added of the percentage range 0-30% of the mixture mass. The main purposes of experimental exploration were to determine the influence of different percentages of limestone powder on compression strength of crushed-stone-and-sand ready mixtures and optimal content of powder. The change of the influence grade was studied by applying different types of sands. Three cylindrical samples were made for each percentage of limestone powder according to a standard method. Compressive strengths of samples have been determined. It was concluded, that the applying limestone powder in C2 and C6 ready mixtures contributes to the cohesion of stone grains as well as to obtaining high indicators of compaction in road pavement layers. The received results allow to arrive to a conclusion that applying limestone powder according to the optimal range distinctly increases the strength characteristics of crushed-stone-sand ready mixtures which in tur contributes the effective implementation of the compacting process. Especially the influence grade is considerable in C6 ready mixtures containing a large amount of crushed stone, as well as in mixtures using sands with smaller fineness modulus.
Determining the Size of Anchor Plates on the Basis of Laboratory Measurements
Authors: Stara Marie , Smirakova Martina , Buchta Vojtech
Published: October 2014

An important part of the design anchorage strands is the proper use of anchor plates, which is responsible for transfer point load (pre-stressing force) from the steel element to the masonry. The anchor plates are usually designed from steel plates that provide transmission of the pre-stressing force from rod (ropes) to the masonry by concentric pressure. Therefore, their size is designed so that was not exceeded the design strength of concentric pressure masonry under the anchor plate. The thickness of the anchor plates contributes to reduce its deformation during tensioning to a minimum. The aim of this paper is performance laboratory measurements of deformation of prestressed masonry especially in the anchorage zone with using anchor plates with dimensions of 150 x 150 about thickness 10 and 20 mm. Prestressed element is a brick corner with a height of 870 mm and thickness 440 mm (exposed masonry). Subsequently are intended of suitable size parameters anchor plates so that they can be used regardless of the site of their future action.
Study of Under Pressure Viscous Fluid Pulsating Flow in Cylindrical Pipe of Circular Cross-Section
Authors: Sarukhanyan A.A. , Martirosyan Angin V.
Published: October 2014

Often due to the pressure gradient change in pressure systems the stationary flow pattern is disturbed initiating respective time-dependent change of hydraumechanical parameters at the cross-section. As a consequence of the pressure gradient change under the influence of varying friction and inertia forces unstable flow of fluid occurs. The study of this phenomenon presents important practical and theoretical interest.
Degradation of the Building Structures due to Carbonation of Concrete
Authors: Pasek Jan , Vejvara Ludek
Published: October 2014

Carbonation of the concrete is a process influencing acceleration of the aging of concrete during the time, at reinforced concrete structures it is usually accompanied with corrosion of the reinforcement and disturbances of the covering layer of the concrete. Its consequence is decrease of the static reliability of the reinforced concrete building structures. Carbonation of the construction from common concrete and lightened concrete causes just in the CR damage worth billions of Czech Crowns every year. The paper refers about seriousness of the current technical state of reinforced concrete structures and influence of the most important factors on the course of their degradation caused by carbonation and specifies principles for designing new reinforced concrete constructions.
The Rationalization of Parameters of the Sucion Intake Device for Packed Bulk Construcion Materials
Authors: Evtyukov S.A. , Schimanova A.A. , Rajczyk Jarosław , Rajczyk Marlena
Published: October 2014

Pneumatic transport is one of the most progressive means of mechanization and automation of loose goods transportation. It is used in aluminium, chemical, food, textile, construction and other industries. However, wide use of pneumatic transport is limited by the incomplete information on this subject. In this article provides a description of the design of useful models of the suction intake device пневмотранспортной installation. A useful model was developed with the participation of the author of the staff of the Department of transport and technological machines architectural-building University. The author has developed stages of the suction intake unit and carried out theoretical and experimental research on each step to achieve the most effective operation of the device. In view of the fact that for the main parameters of the suction intake devices of the theory of destroying the fabric of a flooded the air flow is not developed to a sufficient degree, the author has studied the process of propagation and interaction of flooded jet with the surface. The article systematized and presents the results of experimental research on the interaction of flooded jets of air sealing with building materials of different kinds. The author determined the optimal parameters of the process of packed loosening material jets of compressed air at the fence material suction fence device.
The Reasearch of the Level of Tunnel Surrounding Rock and the Stability Based on Fractal Theory
Authors: He Jian Tao , Dong Jun
Published: October 2014

A new nonlinear discipline named Fractal theory which is a scientific theory and method studied the irregular of nature and complex phenomena has been used in civil engineering direction successfully in recent years. Take the Kuo changshan tunnel as an example, this paper will use the Range finder to measure the shape of surrounding rock along different longitudinal section contour line, then using the fractal theory to analyze it as follows: using section assumption, box counting method and higher dimensional method to calculate the fractal dimension, and to explore the relative relations between fractal dimension and stability of surrounding rock of the tunnel. The research results show that the more rough the tunnel longitudinal section contour line, the bigger the fractal dimension, the worse the corresponding stability of surrounding rock and the worse the lower the level of surrounding rock . Above all the tunnel longitudinal irregular section contour line has obvious fractal characteristics.
Underground Barrier Protection against the Spread of Vibration - A Model Study
Authors: Petřík Tomáš , Hrubesova Eva , Pinka Miroslav , Hastíková Alice
Published: October 2014

The designs of the buildings are in addition to the static load exposed to ground vibrations spreading from the surrounding geological environment. Ground vibrations, which are produced by anthropogenic phenomena, are not usually the crucial load for the stability of the building. But this load have an adversely affect the walls of buildings or sensitive equipment in these buildings. This article will be deal with model study of underground barriers utilized as a protection against the spread of ground vibrations in geological environment. These underground barriers maybe used in the vicinity of roads or railway lines or in urban areas around the halls with heavy industrial activity. Material of underground barriers will be designed from material with different parameters, so that it could be assessed the best variant in terms of absorption of seismic waves. The different variations of the thickness of underground barriers and different distances from the source of vibration will be designed in the analysis. The analysis will be performed in mathematical models that will be created in the software’s based on the finite element method.
Shaking Table Test Study on Seismic Responses of Base-Isolated Buildings under Near-Fault Ground Motions
Authors: Han Miao , Duan Yan Ling , Sun Huan
Published: October 2014

The shaking table tests of a 1:7 scale model of three-floor steel frame base-isolated building was completed to study the seismic responses of base-isolated buildings under near-fault ground motions. Under the action of the typical near-fault seismic wave, the seismic responses of base-isolated structures increase with the increase of PGA. The maximum story displacements of super-structure decrease with increase of story. The velocity pulse has an adverse effect to acceleration responses of base-isolated structures. The isolation effect of base-isolated super-structures is still favorable under near-fault ground motions, but it will be necessary to add damping in isolation system or limit the displacement of bearings to prevent the excessive deformation of isolation layer.
Basics of Metals Theory of Extraction by Means of Chemical Water Solutions Filtration through Underground Ores
Authors: Sargsyan Vruyr , Saratikyan Emil
Published: October 2014

Abstract. Geo-technological extraction methods recently are widely used in the mining industry. Removing the metals from underground ore deposits is carried out by injecting chemicals (solvents, oxidants, reducing agents) into wells drilled in them, and the subsequent extraction of metals from saturated solutions. Particularly, this method utilized for the extraction of uranium from flooded sediments and copper from poor (substandard) ores, as well as some non-ferrous and rare metals from waste dumps and tailings of substandard ore mines and processing enterprises. The paper discusses methods developed for prediction of moisture content (water saturation) in rocks under filtration of liquid with incomplete saturation of pores while changing the concentration of the metal in the liquid phase (in an ore body), as well as problems of dissolution and desorption of metal salts on the surface cracks or pores on ore body based on molecular diffusion equation of metal salts. The present work conducted for developing the methods for calculating the liquid filtration through underground deposits of minerals and forecasting of dissolving and washing out metals. It is shown that the processes which take place with the use of chemical reagents are different comparing to the similar processes with water injection. These data allow to predict the changes in the concentration of salts and metals in the liquid and solid phases depending on time.
Economic Aspects of Implementing Energy Performance Labelling of Buildings and Flats in the Czech Republic
Authors: Pasek Jan , Mlcak Jan , Paskova Katerina
Published: October 2014

Since 2013 it is compulsory in the Czech Republic to declare energy performance of a property intended for sale or lease in so called Energy Performance Certificates. Before introduction of this obligation many various arguments were presented to public to support it, especially by the subjects participating in the energetic evaluation of buildings. One of the most common arguments was that this gives people interested in lease or purchase of a property with high energy consumption a tool for reduction of the rental fee or the purchase price. This contribution, based on performed research and wider analyses, shows that this assumption together with others was misleading, and it also evaluates the reasons of this fact.
Microgeneration Based on Renewable Energy in Sustainable Building
Authors: Kurzak Lucjan
Published: October 2014

This paper focuses on the present and prospective use of renewable energy in sustainable building. Construction industry, which consumes over 40% of world energy production and generates nearly 35% of world greenhouse gas emissions, bears responsibility for preservation of environment. The principal part of this publication discusses renewable energy as an inexhaustible and ecological source, which conforms to the general principle of sustainable growth.
Exploitation of Heat from Thermal Active Coal Tips
Authors: Kresta František
Published: October 2014

Burning tips of colliery spoil represent long-term ecological hazard. History of these processes in the Ostrava region is more than 20 years long. The attention in the past was in case of burning tips given to control, even to remediate underground fires. Thermal potential of burning tips has remained unnoticed. Just in last five years in Czech republic and abroad it has started to experiment with heat exploitation originating during tips burning. Trial tests with heat exploitation in the Hedvika tip in Ostrava were successful and they produced even economic contribution. Verification of marginal conditions has been already a topic of ongoing research. Hazards during heat exploitation from thermal active coal tips are as follows: migration of thermal spots, difficult temperature regulation of the surroundings from which heat is taken, aggressiveness, and from it resulted demands to materials used in this technology.
Diagnostics of Building Claddings and Design of Technical Solutions with Regards to Energy Performance
Authors: Peřina Zdeněk , Haliřová Marcela , Wolfová Marie , Fabian Radek , Ševčíková Hana , Rykalová Eva
Published: October 2014

Building claddings still contains some technologically complicated details. The paper deals with modern diagnostics methods and possible solutions to eliminate energy leak.
New Trends in the Separation of Significant Greenhouse Gases from Flue Gas Streams
Authors: Witasek Roman , Pánek Petr
Published: October 2014

The paper is closely related to the challenge of the most important greenhouse gas - carbon dioxide. Both, the effective capture and secure storage of CO2, is an urgent environmental problem. Approximately ¾ of all anthropogenic emissions of CO2are related to the use of fossil fuels. Great attention is given to the absorption processes for the capture of the gas. Carbon Capture and Storage (CCS) is a promising solution for achieving a significant reduction in CO2- emissions. Capture of combustion gases using standard volatile organic solvents are the source of numerous problems like environmental pollution, instability and corrosivity of such solvents. An effective solution seems to be the use of ionic liquids. Ionic liquids are a relatively new class of compounds, which are chemically and thermally stable and are able to dissolve a wide range of substances. The negligible volatility of ionic liquids is their most important property. Research and development of the CO2- capture technology has not yet reached the stage of commercial exploitation under economically acceptable conditions. The aim of this article is to show the possibilities of use of ionic liquids in the absorption separation processes for CO2-capture.
Influence of Transparent Partitions on Selected Energy Indicators of the Building Located in Central Europe
Authors: Ujma Adam , Lis Anna
Published: October 2014

The article discusses basic regulations and demands for windows and natural lighting. It presents results of analysis of lighting of the chosen interior space taking into consideration periods of exploitation of the artificial and natural illumination. The employment of glass of different light permeability were taken into consideration. Results of calculations were used for evaluating time of electric energy needed for artificial lighting in analyzed variants of natural light systems.
Technological Processes in Natural Stone Processing with Recommendations of Processing Tools Evaluation
Authors: Rajczyk Jarosław , Kosiń Mariusz
Published: October 2014

The processing of surface of stone elements, as a result of which they are getting the relevant texture and the surface quality, is one of main requirements in the masonry production. As a result of finishing processing in the process of grinding, the surfaces should have a regular appearance of the surface.They should conform to certain requirements of norms on all exposed surfaces.
This process can be conducted with grinders: knee, arterial or bridge. These machines are working with so-called heads equipped with abrasive fillers in the form of sections about different geometrical shapes fixed to the processing head which is a so-called load-bearing shield.
Ensuring the appropriate quality, smoothness of mineral surface is significant for:
- receiving required physical and mechanical parameters what has the significant influence on the operating period and running costs associated with it,
- keeping the purity of the surface, what reduce the time of cleaning i.e. maintenance of the object,
- utrzymania czystości powierzchni, co zmniejsza czas sprzątania tzn. utrzymania obiektu,
- aesthetic and architectural adventages.
Providing the high quality for the surface is depending on effectiveness of the influence of operating units which they comprise i.a. geometrical form of so-called rubbing sections. The article is devoted to the methodology of the evaluation of effectiveness of the processing which among others rubbing geometry tools determines.
Improved Technology of Reinforcement Works and Technical Substantiation of Reinforcement Bar Oscillation Cutting
Authors: Evtyukov S.A.
Published: October 2014

New technologies of reinforcement works have been developed. The results of studies have been recommended to be applied in engineering methods to calculate manufacturing of reinforcement units. Oscillation cutting has been theoretically grounded, the physical nature and process of oscillation cutting and shaping have been studied.
Capacity of Intersection with and without Connection Lane on the Left of Running Lane
Authors: Krivda Vladislav , Mahdalova Ivana
Published: October 2014

The paper deals with problems of capacity assessment of intersection with or without the connection lane on the left of running lane. The paper describes capacity calculations for intersection without this lane according to Czech standards and proposes the possible procedure of calculation for intersection with the connection lane on the left of running lane. Comparison of capacity reserves is made on concrete example with real traffic flow volume values.
The Influence of Roundabouts on Drivers’ Speed and Behaviour
Authors: Ziolkowski Robert
Published: October 2014

Driving speed is one of the most important factors in road safety and speed not only affects the severity of a crash, but is also related to the risk of being involved in a crash. Inappropriate speed is responsible for more than a third of all fatal accidents occurring on roads. In Poland every year about 70% of all traffic accidents occur in urban areas from which most is recorded at junctions. In order to improve traffic safety many efforts have been undertaken but their performance is still not satisfactory. One of the solutions for improving safety in cities is designing new and replacing already existing crossroads by roundabouts. They offer improved safety over other types of intersections having fewer conflict points, slower speeds and easier decision making. Specially single-lane roundabouts are pointed as an example of a very safe junction when compared to not-signalised and signalised. Author’s previous research considering traffic safety at crossroads in Bialystok, Poland has confirmed lower number of accidents and deaths at roundabouts when compared to other types of junctions but at the same time the number of collisions remained at unexpectedly high level. The aim of this paper is to analyse the influence of roundabouts on drivers’ behaviour and approach and exit speeds at roundabouts located in Bialystok, Poland. Measurements of instantaneous speed, acceleration, deceleration and route tracking data were undertaken to develop the investigation.
Modernization of a Historical Object in the Contest of Contemporary Requirements of Urban Space in the City of Częstochowa
Authors: Sołkiewicz-Kos Nina
Published: October 2014

The article covers the problems of the shaping of the environment as well as living conditions in urban areas. Social needs, which are changing in time, make it necessary to adapt urban development to contemporary functional requirements. Such actions are particularly difficult in downtown areas where the interference concerns well located and preserved architectural and urban complexes. Directing attention to the areas of strict center of Czestochowa is not accidental. It is a city of importance to Polish history. It also belongs to the culture-creating sites for the nation. From so well preserved urban complexes there are required solutions arising from the uniqueness of the place and the role it fulfills – in this case: the city of pilgrimage, an academic center and a tourist destination. The search for strategy and tactics of quality raising of the downtown areas should cover both the urban context and historical and contemporary background of the city. The paper presents examples of attempts to acquire urban space in reference to the main urban assumption of the city of Czestochowa.
Reliability Analysis of Relevant Radom Variables in Pedestrian Evacuation Study in Underground Transportation Hub
Authors: Zhao Dong Fu , Zhang Xiao Lin , Su Yu
Published: October 2014

In this study reliability theory was applied in evacuation time of pedestrians in the subway, especially taking the correlation of pedestrian speed and pedestrian flow coefficient into account. Firstly, the traditional evacuation time design formula was regarded as research model. Statistical distribution of pedestrian speed and pedestrian flow coefficient in the model was analyzed .Thus the reliability limit state equation was built. Then the evacuation time’s reliability probability was obtained according to the checking point method of generalized random space. At last the process of how different factors influence the reliability was analyzed. Results show that we should consider the correlation between pedestrian speed and export flow rate when correlation is big (absolute value is greater than 0.5, for example).Our conclusions will contribute to related research and the formulation of actual planning.
The Rule of Law when Renting State and Municipal Property
Authors: Chibinev Vyacheslav Mikhailovich
Published: October 2014

The work includes the theoretical and practical research in the field of civil and land legislation. There are some conclusions based on the scientific analysis of the law and legal practice that were made containing the analysis of the problems related to the conclusion and state registration of real estate lease agreements and their execution. Some proposals on improvement of the existing Russian legislation were made by the author.
Managing the Local Economy on the Example of the Construction Sector Companies
Authors: Nowakowska-Grunt Joanna , Wiśniewska-Sałek Anna
Published: October 2014

Building the local economy in terms of its structures and relationships is a major challenge for local authorities. Particularly difficult for regional competitiveness are the areas which focuses many companies with the same or a related sector. It is important to manage appropriately with their resources and production capabilities, which can bring benefits both for the region and the entities operating in a specific region. Identification of clusters is the initial action allowing to know the economic strength of its regional dimension. At the economic and political level, the cluster provides support for the government, which is able to capture the sense of the range of need for innovative activities in the region and this in turn, provides a strong incentive allowing to focus on clusters promotion. However, it is necessary to maintain the correct order, because only after the entrepreneurship and regional production systems analysis (e.g. in form of technological innovation) and finding a market imperfections, the government can decide, what actions are more likely to influence the improvement of regional economy. The lower levels of cluster should not be excluded, because the identification of actions based on cooperation is made there. This article presents a practical solution to identify potential cluster initiative for companies in the construction sector in one of the Polish provinces.
The Assessment of Construction Project Management Maturity Level in the Silesian Region in Poland
Authors: Jelonek Dorota , Nowakowska-Grunt Joanna , Ziora Leszek
Published: October 2014

Every construction investment is a project requiring close coordination, the freedom of access to the information, the application of special activity techniques and most of all the high level of maturity of construction project management. Findings of research conducted in different areas of project management confirm that the assurance of high level of project management maturity conditions the achievement of project's success. The higher level of maturity means the greater degree of capability to manage a construction project. The aim of the article is verification of the following hypotheses: H1: Polish construction companies in a small extent use integrated management of construction project. H2: The highest maturity of construction project management appears in knowledge areas connected with cost management and time management H3: The lowest maturity of construction project management appears in the areas of knowledge connected with risk management and communication management. The study reported in this article was conducted during 2013 year in the construction sector. The survey method was applied in research process. The research embraced 23 construction companies. The respondents are managers of the highest and medium level of management in construction companies. The respondents indicated one out of five maturity levels for selected nine knowledge areas: Level 1: „Initial”, Level 2 “Evolving”, Level 3 “Perfecting, Level 4 “Accomplished” and Level 5 “Optimizing”. Based on the results of an analysis into the level of maturity of project management processes in Polish construction companies, the overall process management maturity indicator for all functions is 3.34. All three hypothesis were verified positively.
Urban Spatial Justice in Australian Low-Carbon City: Perth as a Case Study
Authors: Wu Xuan
Published: October 2014

As one of the prominent cities across the world holding the idea of urban spatial justice, Perth, the capital city of Western Australian, promotes the concept of “harmony between urbanization and nature”. Perth is applied as the case study on the basis of Edward Soja’s theory of “Spatial Justice” and Page’s theory of “Intra-generational Equality” via empirical approach to inquire into the coordinated and balanced development of three elements in urbanization of Perth: economy, society and environment. It articulates the temperance to the existing environment and natural resources as the core value when promoting “Intra-generational Equality” and refers to the equal allocation and rational consumption of the existing environment and natural resources as the spatial equality in Perth. In addition, another focus goes to the analysis of the relation between the scientific urban management systems and the low-carbon spatial justice, and it is “Intra-generational Equality” that proves to be the basic premise and foundation on which the relation counts, which serves as a reference to the international metropolis’ urban spatial justice across the world.
The Technical Data Analysis of Khachen Reservoir’s Hydrosystem
Authors: Sarukhanyan Arestak , Manukyan Ani
Published: October 2014

After operation of ground hydraulic constructions, it is necessary to implement monitoring during several years; which includes collecting data concerning filtration flow, deposition, strength, sliding and stability of dams and other hydraulic constructions. The technical state study conclusions are drawn upon the collected data analyses. The aim of the work is to make a technical state study of Khachen reservoir hydro system to find out the further exploitation opportunities separated nodes, to process engineering measures program, by the realization of which there will be established conditions for their further safe operation. For the above mentioned purpose there have been implemented the followings: technical data analyses of the dam and it’s separate nodes, technical-economic analyses of the dam, analyses of storage alluvium, net volume and water balance, physical-mechanical properties lab studies of dam ground. Homogeneity estimation of dam by geophysical methods, discovering of filtration centralized discharge across dam and lateral prism, making conclusions, separate nodes description located in the dam, technical state analyses and making conclusions, strength and stability analyses of the dam under static and seismic loading conditions, taking into consideration the ground laboratory experiments and dam geodetic measurements.
Peculiarities of Discharge and Purification of Sewage in the Sevan Basin
Authors: Levonyan Levon , Hovsepyan Gohar , Madatyan Gayane , Harutyunyan Ruzanna
Published: October 2014

In the process of managing water proportions Lake Sevan has its specific place and role, which is the largest natural reservoir of the country and the national wealth. A number of programs and activities were made to preserve Lake Sevan and use the water resources effectively in the past, which are not complete yet. That’s why comprehensive attention should be paid to the preservation of the lake, efficient use of its water resources and environmental problems.
The Problems of an Internal System Formation in Quality Assurance for the Professional Tertiary Education of the Architects and Constructors
Authors: Markosyan Ashot , Tokmajyan Sofia , Ivanyan Gohar
Published: October 2014

Yerevan State University of Architecture and Construction was founded in 1921, is considered one of the best engineering universities of the CIS. There are more important issues for the university in the current stage of development. Those issues are the followings: • Quality education and appropriate incentives and mechanisms for their implementation. • Modern information technologies and their application in the fields of educational expansion process, the increase of e- learning materials. • School - university collaboration and consolidation of new forms of communication, • Vocational education graduates with the skills and knowledge to improve the quality of labor demand, • Tertiary and postgraduate education programs to increase enrollment of vulnerable groups. Professional quality university education is seen as the students' learning, mastering the knowledge and mastery of skills. It is an integral part of the process through which the acquired factual and reliable outcomes based on the quality of the training. It is self critical way and, removed the factors influencing the quality of the educational process, and outlined ways to improve the process of education further.
Hydrothermal Synthesis and Characterisation of Mn2O3 Nanowires
Authors: Deng Bin , Huang Hai Ying
Published: October 2014

In this Letter, we reported the facile synthesis of manganese (III) oxide (Mn2O3) nanowires via the facile hydrothermal treatment in the presence of ammonia, which were prepared simply by hydrothermal treatment of commercial bulky Mn2O3crystals at 160oC for 24 h. The obtained Mn2O3products consist a large quantity of nanwires with the diameters of 30-90 nm, and lengths ranging from 1 to 10 μm. Such high quality nanowires with high aspect ratio have a variety of promising applications. The simplicity of hydrothermal process, cheapness, and availability of raw materials, without the need of catalyst or template, are advantages favoring industrial manufacturing in scaled-up process by the novel method. X-ray and transmission electron microscopy, electron diffraction, and scanning electron microscopy have been employed to characterize these materials. In addition, the possible growth mechanism of the Mn2O3nanowires was also proposed. The growth of Mn2O3nanowires occurredviaa dissolution-recrystallization process.
Preparation of Cu/Co/Fe Mixed Oxides and their Catalytic Behavior on HC-SCR DeNOx
Authors: Liu Hong Bo , Huang Zhi Yong , Li Lin Jie , Huang Jun Ting , He Zhi Cong , Li Chi Hui , Wu Guo Bo , Wu Zhi Yu
Published: October 2014

Co/Cu/Fe mixed oxides (Co/Cu/Fe-MOs) were prepared by calcination of Cu/Co/Fe hydrotalcites (Co/Cu/Fe-HTs) precursors. Their structure and morphology were characterized by XRD, TGA, IR and SEM. Co/Cu/Fe-MOs were used for selective catalytic reduction of NO by hydrocarbon. Their catalytic activities were studied by NOx analyzer. The results show that Co/Cu/Fe-MOs have homogeneous distribution of hexagon with particles size around 30~50nm and the specific surface areas are around 70~110 m2∙g–1. Cu2Co8Fe5-MOs sample exhibits the highest NOx conversion of 32%. Co/Cu/Fe-MOs with lower calcination temperature have higher catalytic activities.
Optimization of Thermal Conductivity in Cu Doped AlN Phosphor
Authors: Cai Xue Mei , Zhou Qian Neng , Wang Jing Mei , Wang Bao Ying
Published: October 2014

Thermal management is one of the major challenges in the development of high powered LEDs. The effects on thermal conductivity of impurity concentration and thickness are studied in Cu doped AlN (AlN:Cu) phosphor in the paper. Density functional perturbation theory (DFPT) and quasi-harmonic approximation (QHA) combined with Debye model are used in the calculation. The results show that thermal conductivity of AlN:Cu is higher than that of Nd doped ytterbium aluminum garnet (YAG:Nd) from 300K up to 1000K thus the temperature of LEDs can be controlled efficiently. Thermal conductivity increases with the rising of thickness while it decreases with the addition of Cu concentration. The influence of Cu concentration on thermal conductivity depends on temperature. The lower the temperature is, the bigger the influence.
Orange and Blue Electrophosphorescence of Iridium Complexes
Authors: Zhang Wen Guan , Qin Lian , Zhao Sheng Min
Published: October 2014

Two iridium complexes, orange emitter bis[2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl- pyridinto-C3, N] iridium (acetylacetonate) ((fl-5CF3-py)2Ir(acac)) and blue emitter bis(4,6-difluoro- phenylpyridine)(picolinate) iridium(III) (FIrPic), were used. As a single emitting layer at the constant emitting concentration of 8 wt %, EL spectra of the device containing the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (8 wt %) peaked at 588 nm, the device having the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (2 wt %): FIrPic (6 wt %) showed the main peak at 588 nm and the weak shoulder peaks at 472 and 500 nm, the device containing the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (0.2 wt %): FIrPic (7.8 wt %) exhibited the main peak at 580 nm and slightly higher shoulder peaks at 472 and 500 nm. The device having the double emitting layers CBP: (fl-5CF3-py)2Ir(acac) (5 wt %) by spin-coating method and mCP: FIrPic (8 wt %) by vacuum deposition showed the main peaks at 472 and 500 nm, and shoulder peak at 580 nm. Maximum luminances of devices were found to be 14582 cd/m2 (at 16 V), 12497 cd/m2 (at 17 V), 1061 cd/m2 (at 23 V), and 5396 cd/m2 (at 25 V), respectively. The absence of host PVK, PBD, mCP or CBP emission in these devices indicated an efficient energy transfer from the host to the guest complex. Holes and electrons were efficiently recombined in the double emitting layers and an important approach for making WOLEDs was provided in the future.
Synthesis and Properties of Novel Light-Emitting Materials Containing Triphenylamine, Olefinic Linkers and Bipyridine Units
Authors: Lv Hai Jun , Yu Yi Feng , Wang Xiao Jia , Hu Zhi Chao , Zhang Jing , Chen Ai Bing , Liu Lei , Yan Yi Zheng , An Qian Qian , Zhang Sha Sha , Feng Tian Li , Wang Xin Ming
Published: October 2014

Organic light-emitting materials D1~D3 containing triphenylamine donors, bipyridine acceptors and olefinic linkers were synthesized and characterized. The optical, electrochemical properties of materials were studied by UV-Vis spectra, fluorescence emission spectra and cyclic voltammetry method. The results show that the maximal absorption peaks of three compounds are in the range of 404nm~408nm and fluorescence emission peaks at the region of 534nm~557nm in dichloromethane solutions, respectively. Cyclic voltammetry measurement showed that these compounds had HOMO energy level in the range of-5.02eV~-5.16eV, which is proper for hole injection. The properties indicate that these compounds have potential for the application as light-emitting materials or hole-transporting materials.
Analysis of Lepidolite Resources in Jiangxi Province in China
Authors: Liu Yue Long , Liu Jia
Published: October 2014

The crystalline structure of lepidolite is introduced in this paper, its application in lithium ion battery is paid attention. Because of the extraction difficulties from brines in China, it is necessary to take advantage of lepidolite resources, driven by the huge economic benefit and social benefit requirements. The components and particle size distributions of lipodilites in Yichun and Yifeng are experimentally analyzed.
Microstructure and In Vitro Biodegradable Properties of Fe-Zn Alloys Prepared by Electroforming
Authors: Wang Wei Qiang , Wang Juan , Qi Min
Published: October 2014

New biodegradable Fe-Zn alloys with different concentration of zinc were prepared by electroforming in this paper. The composition, phase and microstructure of the Fe-Zn alloys were investigated by EDX, XRD and SEM, respectively. The potentiodynamic polarization and static immersion test were used to evaluate the in vitro biodegradation properties of these alloys. The results revealed that the alloys consist of single-phase Fe-Zn solid solution and have a better degradation property than pure iron, which make it a potential material used for bioabsorbable endovascular stent.
Study on Experiment and Simulation for Laser Surface Micro Texturing on Cylinder Piston Ring Friction Pair
Authors: Gong Wei , Dong Fei , Du Yun Peng , Xiong Ji Lin
Published: October 2014

Regarding the cylinder piston ring friction pair system as the object , put forward a new numerical simulation method to study the thermal effect mechanism of single pulse interval laser micro texturing. By means of numerical simulation and experimental verification, analysis the variation of laser pulse frequency and laser power on the 45# steel surface micro cavity morphology. The simulation and experimental results show that along with the increase of laser pulse number, the depth of micro cavity increases, the recasting phenomenon of molten metal is obvious, and the machined surface quality decreases. At the same condition, the micro cavity depth simulation results and experimental results are basically the same trend; the maximum error is less than 8%, which proves the feasibility and validity of the numerical simulation method.
The Research and Identify on Hydro Generator Rotor Windings Short-Circuit Fault
Authors: Li Yong Gang , Jia Jie , Wan Liu
Published: October 2014

Hydro-generator unit is the most important energy conversion device in the hydropower, which is directly related to the safety and reliability and stable operation of the hydroelectric power plant. When the turbine generator rotor winding inter-turn short circuit occurs, the proposed method using load curve electromagnetic characteristics analysis, the use of before and after the failure to find the relative change in the excitation current failure rate as the identification method, the criterion may reflect the severity of the failure, perform theoretical calculations, and thus the inter-turbine generator rotor windings short circuit simulation, consistent with the conclusions of the theoretical analysis.
A Dynamic Neighborhood Selection Approach for Locally Linear Embedding
Authors: Shan Gui Jun
Published: October 2014

Locally linear embedding is based on the assumption that the whole data manifolds are evenly distributed so that they determine the neighborhood for all points with the same neighborhood size. Accordingly, they fail to nicely deal with most real problems that are unevenly distributed. This paper presents a new approach that takes the general conceptual framework of Hessian locally linear embedding so as to guarantee its correctness in the setting of local isometry to an open connected subset but dynamically determines the local neighborhood size for each point. This approach estimates the approximate geodesic distance between any two points by the shortest path in the local neighborhood graph, and then determines the neighborhood size for each point by using the relationship between its local estimated geodesic distance matrix and local Euclidean distance matrix. This approach has clear geometry intuition as well as the better performance and stability to deal with the sparsely sampled or noise contaminated data sets that are often unevenly distributed. The conducted experiments on benchmark data sets validate the proposed approach.
Chemical Characterization of the Essential Oils of Eucalyptus.grandis×Eucalyptus.urophylla Hybrids and Six Pure Eucalyptus species Grown in Guangxi (China)
Authors: Lu Feng Lai , Chen Yue Yuan , Wei Jiao Hong , Huang Yong Lin , Li Dian Peng , Liu Zhen Yi
Published: October 2014

Hydrodistillation of the fresh leaves of E.grandis×E.urophylla hybrids and pure species E.grandis, E.urophylla, E.pellita, E.camaldulensis, E. dunni, and E.saligna collected from the trees grown in Guangxi Huangmian Forest (China), afforded essential oils in yields varying from 0.24±0.15% to 5.36±0.28%, according to the species. Analysis by GC (FID) and GC/MS allowed the identification of 67 compounds, representing 82.55% to 91.03% of the total oil composition. The dominant compounds were 1,8-cineole in E.saligna, E.urophylla, E.grandis×E.urophylla, E.grandis, E.pellita and E. dunni (67.48, 57.12, 48.21, 23.64, 20.34, 20.22%), p-Cymene in E.camaldulensis,E. dunni and E.grandis(21.32, 14.74, 13.38%), α-pinene in E.grandis and E.grandis×E.urophylla (21.77, 15.55%), α-terpinene in E. dunni and E.grandis (17.96, 9.35%), α-terpineol in E.pellita and E.saligna (19.24,11.54%), respectively. Hierarchical Cluster Analysis separated the characterized essential oils into two groups, each constituting a chemotype. E.grandis×E.urophylla and E.urophylla were classified in the same group, while E.grandis in the other.
Effect of DTPMPA on Bamboo Kraft Pulping
Authors: Gao Hong Xia , Guan Xiu Qiong , Xu Miao , Zhang Xiong
Published: October 2014

As a cooking additive, the impact of Diethylene Triamine Penta Methylene Phosphonic Acid (DTPMPA) on bamboo kraft pulping was studied. The effect of DTPMPA dosage at different maximum cooking temperature was discussed. The results showed that the cooking aids DTPMPA added in bamboo kraft pulping was able to reduce K value of pulp, improve the screened stock yield and brightness and reduce the alkali charge. The optimized bamboo kraft pulping conditions are: DTPMPA dosage 0.3%, alkali charge 17%, when sulfidity was 20%, maximum cooking temperature was 160°C and time at maximum temperature was 90min. Under the conditions of cooking, the screened yield is 41.53%, the K value is 15.4 and the bamboo pulp brightness is 26.8%.