bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Spatial Distribution of Surface Water Resources in Lhasa Based on RS and GIS
Authors: Xu Xia
Published: August 2013

Surface water resources study has vital function for Lhasa and whole Tibet. TM images in 2000 and 2010, GIS and landscape ecological theory are applied to analyze the spatial distribution characteristics of Lhasas surface water resources. The results show: there are 6662 patches in 2000 and 6340 patches in 2010, which means there have disappeared 322 patches, while the area have increased 20.95km2. The lakes class is the main surface water resources with 41.11% in 2000 and 41.03% in 2010. Tibetan Plateau is very sensitive to global cliamte change, espectially in water resouces. The areas of ice and glaciers, forested swamps, shrub swamps have no change. While other kinds of classs area shows increasing trend, especially rivers area, which increased 12.20 km2.
Study on Scheme Optimization of Low Carbon Construction Based on Value Engineering
Authors: Cui Ming Xin , Ji Lin
Published: August 2013

This paper focused on how to apply Value Engineering to optimize the low carbon scheme of construction, studied how to construct evaluation index system of low carbon solutions, and proposed the method of determining the function importance coefficient according to consumer demand and determining the real cost of low carbon construction. Through analyzing the matching degree between function and cost according to function evaluation value and real cost of function, the method of determining the low carbon optimization scheme was proposed.
Visitor Experience in the River Corridor Greenway: A Study of Zengjiang River Greenway in Zengcheng, Guangzhou
Authors: Wu Juan Yu , Xu Jian Xin
Published: August 2013

Recently river corridors in Guangzhou are being focused on as important natural networks in urban environment as well as cultural and recreational resources. The study area of this research is the Licheng section of the Zengjiang River Greenway. We attempt to do a comprehensive evaluation of its built environment by visitor experience. The main research contents were divided into 6 aspects: facilities, green space, signs and maps, transport, security and management, and recreational activities in external environment. Through the analysis, we identified six human dimensions of visitor experience in the studies: cleanliness, aesthetic, comfort, safety, suitability and hydrophilic property. As a result of this research, some problems on the evaluation were grasped by the hierarchy process analysis based on the above six categories. We concluded by discussing solutions of these problems, and suggested some proposals in design to meet the visitors’ requirement for the future construction of greenway. The Zengjiang River Greenway has served as a model for riparian greenways elsewhere in the Pearl River Delta.
Discussion on the Green Products and Recycling Industry of Biotechnolongy Fulvic Aicd
Authors: Yang Shu , Yang Shuo , Du Gui Juan , Ma Feng Jiang , Zhang Zhe
Published: August 2013

Biotechnolongy fulvic aicd is internally-recognized green, environment-protective and natural bioactive substance. It is able to effectively solve many bottleneck problems besetting development of issues of agriculture, farmer and rural area such as rural energy, food safety, environmental pollution, agricultural high yield and efficiency and agricultural sustainable development through developing BFA technology and its industry and developing methane, compound fertilizer, pesticide, growth regulator, feed additives and veterinary drug etc. by use of husbandry, industrial by-product and organic household refuse as raw materials to realize cyclic utilization of substance.
The Generation and Analysis of Carbon Steel Pickling Sludge
Authors: Fang Bin Bin , Yang Yang , Chu Zhen , Sun Xiu Yun , Huang Wen Ping , Song Xing Wei , Wang Lian Jun
Published: August 2013

The sludge generated from carbon steel pickling process, containing a large number of metal ions, particularly hexavalent chromium, mercury, lead and nickel ion, which is considered to be a kind of hazardous solid waste. The content of moisture in the sludge is 40.02% to 97.30% ,and pH value is about 7 to 11 ;The content of iron in the sludge is the highest, which is from 14.21% to 50.12% ; Other conventional metal elements like Ca , K, Na and Mg ,their content as follows: 5.93% to 29.93% , 0.011 % to 0.14% , 0 to 0.33% and 0.11% to 1.65 % . The heavy metal elements like Zn, Ni, Mn, Cr, Cu, Hg and Pb, their content as follows: 0.0094% to 4.83%, 0.0063% to 1.129% , 0.0226% to 0.106, 0.0103 % to 0.0647% , 0.0034% to 0.0657% , 0.0017% to 0.0135% and 0.0012% to 0.0038% . The anions like SO42- , Cl- and PO43-, their contents are 0.18 % to 31.92%, 0.05 % to 4.27%, 16% to 11.61%, respectively. This paper has a certain reference value for the treatment and utilization of carbon steel pickling sludge. This paper has certain reference value when treating and utilizing the plain carbon steel pickling sludge.
Study on the Preparation of Fe (NO3) 3/Diatomite Catalysts and the Process to the Treatment of Phenol Wastewater
Authors: Wang Wen Yuan , Gu Jin Chuan , Lin Wei Lan , Wang Yu Heng
Published: August 2013

Prepared the catalyst of diatomite supported Fe (NO3) 3 by impregnation method. Using the Phenol wastewater as the research object to study the catalytic performance of catalysts, then determining the preparation conditions of the catalysts; Discussing the best reaction conditions by the catalyst application research was carried through. Research showed that the concentration of active components, calcination time and the temperature had significant impacts on the activity of the catalyst. Under the condition of the active component concentration of 0.2mol/L, soaking time 4h, calcination temperature 300°C could produce high activity Fe (NO3) 3/ diatomite catalyst. In treatment of phenol wastewater, the optimized conditions of the catalyst for treating phenol wastewater are as follows: the reaction temperature is 30°C, reaction time is 1h, the dosage of catalyst is 0.6g/mL, oxidant dosage is 30mL/L.
Research on Guangxi Mountainous Villages and Residents Building under the Principles of Sustainable
Authors: Pang Ying , Liao Shi Liang , Sun Wei Bin
Published: August 2013

Based on the hot and rainy climate characteristics in summer in the mountains of Western Guangxi and Northern Guangxi, traditional ethnic minority villages and construction is explored under the guidance of sustainable create. Minority traditional house stilted building in Western Guangxi and Northern Guangxi is used for reference. Reasonable theory of architectural design and technical measures is adopted to explore a style of residential building which would be safe, comfortable, conductive to the protection of traditional mountain in villages morphology, efficient use of resources and minimum impact on environment, so that traditional minority building would be renewed under the new technology.
Simulation Study of Planning Layout Effect on Outdoor Microclimate of Cold Residence
Authors: Wang Na
Published: August 2013

In this thesis, we research on the influence of planning layout to the microclimate. Simulate some settlements planning layout cases by ENVI - met software, comparing and analyzing the results, to conclude each planning layout factors effect rules. The research achievements will make guide for designer.
Research on Large Eaves' Shading Effect Based on Parametric Design Platform
Authors: Zhang Zhuo Peng , Shen Jie , Zhao Li Hua
Published: August 2013

Nowadays, large eaves have been widely applied in various modern large-scale public buildings. Due to their huge lengths, they can shield large areas of building facades from insolation, so their shading effect is evident. Nevertheless, little research has been conducted on precise evaluation of large eaves' shading effect. Based on these considerations, the paper set up a parametric design & analysis platform, and then generated parametric models of various sizes. In addition, shading coefficients of windows on the south façades were obtained through computational simulation. Subsequently, a mathematical relationship between shading coefficients and model size parameters was discovered. Finally, the paper discussed the heights of shading areas under large eaves. These conclusions can help ameliorate the Standard.
CFD Simulations of Natural Ventilation Effect: A Case Study of New Administrative Building of the Guanyin Township
Authors: Yang An Shik , Wu Jen Hao , Juan Yu Hsuan , Su Ying Ming
Published: August 2013

The present study developed a computational fluid dynamics (CFD)-based performance simulator for assessing natural ventilation effectiveness to the central patio and corridors of the new administrative building of the Guanyin Township, Taiwan. The data can share with other potential users for achieving better understanding of the indoor microclimate and the interaction of buildings with urban wind environment for improvement of their design and functioning aspects during the decision-making procedure.
Individual Thermal Environments of Building with a Novel Air-Conditioning Energy-Saving Equipment
Authors: Tuan Nguyen Anh , Wu Wu Chieh , Nguyen Huy-Bich
Published: August 2013

Individual air-conditioning system (IACS) can create an individual thermal environment control in a workroom which can contribute to save air-conditioning energy. In this study, we analyze the airflow circulation cell of the IACS with varied outlet port opening dimensions using the computational fluid dynamics (CFD) technique. We created an IACS, two workstations, lightings, and a cabinet in a 3-dimensional room. The fluid was assumed to be Newtonian, unsteady, and incompressible. We examined the effects of the outlet port opening on airflow circulation establishing process. Results will indicate the suitable outlet port opening for maintaining individual satisfied occupants’ requirements and improving energy saving potential.
Internal Relation between Design and Culture - Chinese Cultural Characteristics Reflected in Interior Design
Authors: Li Tao , Zhou Jing
Published: August 2013

With the increasingly development and practice of interior design in China, designers are facing an important problem which requires them to have a good consideration,that is the culture reflected in their design is borderless.The urgent problem which comes to us now is try to reflect the inheritance and innovation of native culture in the interior design in a right way. Designers need to think better of returning to traditional Chinese culture and have it carried forward.The traditional culture and the taste of traditional aesthetic concept are well worth learning by designers, which is the foundation of the design. We should think deeply of current design behavior and face the reasonable direction of the development squarely, so as to make Chinese interior design more competitive in the world market.
A Study on Characteristic of Polymer Matrix Composites Using Experimental and Statistical Approach
Authors: Tajul Arifin Ahmad Mubarak , Abdullah Shahrum , Zulkifli Rozli , Wahab Dzuraidah Abd
Published: August 2013

This paper focuses on the characteristic study of polymer matrix composites using a statistical approach, in terms of difference experimental and reflected to difference stacking sequence and orientation of composite lamination. Composite material, have an excellent characteristic and behavior, but with a difference application and materials used, it have a difference phenomenon occurred before the composite structure are collapsed. Therefore, in order to understand the characteristic of polymer matrix composites, it needs to investigate the phenomenon that influences the structure of composite lamination before failures. In this research, polymer matrix composites are produced using difference material and stacking sequence of lamination. The matrix used is thermoset epoxy and polyester resin with chopped strand mat (CSM) and woven roving (WR) as reinforcement materials. It has been produced using hand lay-up technique. The experimental work is carried out using the tension and flexural test accordance to ASTM-D3039 and D-D790 standard. By using a statistical approach, it can clearly show the differential between materials used with a characteristic of composite materials. It is noted, based on this investigation it also showed difference phenomenon failures and damage structure of polymer matrix composites with difference type of experimental.
Analysis of Energy for Deoxidization-Distillation Process in Titanium Sponge Combination Production Technology
Authors: Wu Fu Zhong , Gao Cheng Tao , Jin Hui Xin , Dou Shou Hua
Published: August 2013

Based on the result of heat balance test,first law of thermodynamics and the second law of thermodynamics,the energy analysis and exergy analysis was made for the deoxidization-distillation process to study the energy efficiency of deoxidization-distillation process in titanium sponge combination production technology.The results of energy analysis show that high temperature physics heat of by-products MgCl2 to be used for better is the main direction of energy-saving.The results of exergy analysis show that reducing internal heat transfer and exergy loss of irreversible reaction is the key to save energy in deoxidization-distillation process.
Experimental Study of Vacuum Freeze-Drying for Acid-Processed Paper Relics
Authors: Zhan Yan Ping , Li Chao , Yu Yue Jin , Zhang Jin Ping , Zheng Dong Qing
Published: August 2013

In this paper, a vacuum freeze drying equipment was developed for vacuum deacidification of paper relics. The relation between freezing velocity and sample mass was studied experimentally, so did the relation between freezing velocity and pre-freezing time. The results indicated freezing velocity is inversely proportional to sample mass as well as the time used with refrigerating capacity equal to mass fraction of frozen water. Problems like melting or disintegration can be overcome by heating gradually. Radiation heating combined with conduction heating make sure the sample is heated evenly. Moreover, vacuum deacidification is available to remove acid of paper relics, and paper relics are kept intact by means of vacuum freeze-drying.
Flexural Creep Behavior of Composites from Polypropylene and Rubberwood Flour
Authors: Homkhiew Chatree , Ratanawilai Thanate , Thongruang Wiriya
Published: August 2013

The effects of plastic grades and composition contents on creep behavior of extruded composites from polypropylene and rubberwood flour were investigated. Virgin polypropylene gave lower creep strain than recycled polypropylene, both in composites and as unfilled plastic. An increase of rubberwood flour content reduced the creep deformation of the composites, both virgin and recycled plastics. Maleic anhydride-grafted polypropylene as a coupling, 5 wt% addition increased the creep strain of the composite materials. Likewise, an addition of 1 wt% ultraviolet (UV) stabilizer content significantly enhanced the creep deformation. The results recommend that the amount of UV stabilizer should be as small as possible to limit its negative effects. Four-element Burger model offered a good fitting on the creep behavior of each composite formulation.
Influence of Aluminum Hydroxide and Expandable Graphite on the Flammability of Polyisocyanurate-Polyurethane Foams
Authors: Wang Wan Jin , He Kui , Dong Quan Xiao , Fan Yong , Zhu Ning , Xia Yi Bing , Li Hai Feng , Wang Jing , Yuan Zhen , Wang Er Po , Wang Xia , Ma Hong Wen
Published: August 2013

The aim of this work was to verify the influence of expandable graphite (EG) and aluminum hydroxide (ATH) fillers on the flammability of polyisocyanurate-polyurethane (PIR). Limited oxygen index increased to 72.5 with an incorporation of 16 phr (parts per hundred of matrix) EG and 50 phr ATH into the matrix (total weight percent was 39.76%). Cone calorimetry was employed to study the flammability properties of these PIR/ATH/EG composites. Scanning electron microscopy analysis was conducted to study the char characteristics of the composites after the cone calorimetry tests. It was found ATH could effectively induce villi like particles, which made the intumescent char denser, on the surface of EG. The compact char layer could effectively impede the transport of bubbles and heat. ATH and EG accelerated the initial degradation and fluffy char was quickly generated on the surface. Thus, degradation products of the composite were slowed down and the diffusion of volatile combustible fragments to flame zone was delayed.
Modelling and Simulation of the Filament Number Distribution of Cocoon Layer in Raw Silk Threads
Authors: Luo Jun , Chen Zhi , Zhang Kai Yan
Published: August 2013

The probability distribution of the filament number of each cocoon layer (FNCL) in the raw silk by fixed number of cocoons reeling process was discussed. The probability distribution and statistic characteristic in stable reeling state were given. Computer simulation of reeling process was undertaken to verify the applicability and theoretical results. The model of stochastic process and the analysis results possess universality.
Thin-Film Non-Polarizing Filters' Simulation Analysis Used in Tilted Incidence
Authors: Wang Chong
Published: August 2013

Central wavelength and pass band width characters of S-polarization and P-polarization will separate when the filter is tilted. This paper gives us multi-layer films structure from one design method which adopts three refractive index materials. Simulation calculations of three concrete filter designs for single cavity and three cavities prove that the method is feasible.
Blast Furnace Slag Foundation Packing Grading and Compaction Characteristics Analysis
Authors: Liu Xiang , Yu Rui Jie
Published: August 2013

Through the packing particles analysis test and heavy compaction test at different depths of new system of Baotou steel finished product of the test section , analysis of the grain size distribution of slag and fly ash mixture and the content of coarse and fine particles on compaction effect are conducted , the results show that the filler embankment foundation is mainly for uniform gradation and continuous filler, when the coarse particle of the filler is 83% ～ 84% content, the compaction effect is best. Using multiple linear regression, the grain size distribution characteristics of the filler particle size equation, coarse and fine particle content and maximum dry density of the regression equation are obtained .
Building Blocks Production with Sludge
Authors: Afonso Mayara , Ferreira Reginaldo , Ribeiro Lubienska Cristina L.J. , Lintz Rosa Cristina Cecche , Gachet-Barbosa Luísa Andréia , Pires Marta Siviero Guilherme
Published: August 2013

The conventional water treatment generates a residue - sludge - which must be properly disposed. There are many ways residue disposal, with for example, landfilling, incineration and reuse of sludge in construction. A advantage of the use of sludge in construction is the decreased consumption of cement and aggregates reduction of environmental impact, considering that the extraction of materials such as sand and gravel. Several studies have been developed using sludge in exchange for raw materials used in proportions that do not alter the properties of concrete. This study evaluates the incorporation of sludge in concrete used to manufacture concrete blocks. Were studied three compositions for the manufacture of concrete blocks such as: Trace 1 (reference),dash 2: by replacing 10% of the mass of cement by the dry sludge and dash 3: by replacing 20% of the mass of cement by the dry sludge. The results indicate that for traces 1, 2 and 3, the blocks are classified with a structural function, for use in masonry elements above ground level, according to the Brazilian standard.
Construction Technology of Water Additional-Weight Immersed Tube Static Piling Machine
Authors: Cui Gao Feng , Liu Hao Chun , Geng Yong Tian , Liu Yi
Published: August 2013

With development of modern science and technology, pile type and pile foundation type, construction technology and construction equipment, pile foundation theory and design method have large evolution. Pile foundation has been to the ordinary foundation type used in the field with week soil texture for constructing all kinds of buildings, especially for high-rise building, heavy duty factory and the structure with special requirement.
Design Research of Wall and Ground Building Materials Based on the Industrial Design
Authors: Li Yan , Li Xiao Dong , Xie Lin
Published: August 2013

Abstract. The present situation of the wall and ground building materials often used is analysed here and some methods that industrial design that can be used to creat new styles of the wall and ground building materials are also discussed and then the future creative design strategies are putted forward.
Discussion on Several Problems in the Study of Corrosion Mechanism of Steel - Concrete Composite Beams
Authors: Li Qing Yuan , Yu Zhi Wu , Kuang Ya Chuan
Published: August 2013

It’s of great practical significance to improve the durability of steel-concrete composite beam structures.The deterioration of steel-concrete composite beams includes stud rust, reinforcement corrosion, corrosion of the steel beams and concrete performance degradation, which are caused by a number of factors. The corrosion mechanism of composite beams is discussed, and some basic issues remain to be solved in this area are analyzed in the paper. Besides, some research directions in the future are put forward.
Some Issues of BIM Application in Landscape Architecture
Authors: Lu Sheng , Wang Fang
Published: August 2013

With Chinese construction industry into the digital age. BIM became mainstream of design method with its advantages of high efficiency, wholeness and visualization. Landscape Architecture must be aware that BIM application is necessary to development in landscape design, especially Landscape Architecture as a new first level discipline since 2011 in China. On the basis of issues that BIM application encountered in the Chinese construction industry, this paper discuss important issues of BIM application that Landscape Architecture must to be solved firstly, namely the awareness of BIM, BIM standard for Landscape Architecture, software and digital resource.
Experimental Study on Mechanical Properties of Recycled Asphalt Mixture with Different Proportion of Rubber Powder
Authors: Niu Qi Ying , Zhao Jun Yong , Li Ru Kai
Published: August 2013

Through a series of mechanical properties experiment of recycled asphalt mixture composed of waste asphalt mixture 20% and different content of rubber powder, the paper analyzes and compares the elasticity, tensile strength and bending strength of asphalt mixture and recycled asphalt mixture, concluding that recycled asphalt mixture that mixed with crumb rubber content of 20% can completely replace the new asphalt mixture in the application. It has great significance for the future to recycling waste asphalt mixture in the highway.
Study on Preservation and Restoration for Traditional Dwellings in Different Historical Periods
Authors: Feng Ke , Guo Juan Li , Chen Cheng , Wang Wei , Du Rong Wen
Published: August 2013

Along with the acceleration of urbanization process, the surviving of traditional dwellings in city's historic districts is in a dilemma due to reconstruction or demolition. Actually, many traditional dwellings have been or being demolished under a new round of urban construction. The pattern of life in urban areas and urban fabric are changing, resulting in the effects on historical architecture in urban areas, especially in historical and cultural cities. This paper analyses the conservation practices on remaining dwellings in the historical districts, according to technical conditions indifferent historical periods. There are three conservation methods: self-conversation, local repair and renewal. On the basis of the dweller surveys in the existing residential areas, we analyze the effects of three methods on protecting their own characteristics from the purpose of the protector, feelings of the residents and practical effect of protection. The paper puts forward a conclusion based on the above research, as well as some advices on new protection models.
Optimization of the Tool Life and the Cutting Speed in Terms of Productivity at Drilling of the Stainless Steel 10TiMoNiCr175
Authors: Vlase Aurelian , Blăjină Ovidiu , Vlase Bogdan
Published: August 2013

The stainless steels are used more and more in various key domains of the technique [. The processing of these steels is determined by their specific physical-chemical characteristics and by their technological properties [2, 3]. The research in the last decade regarding the cutting machinability of the stainless steels have highlighted the insufficiency of the data for establishing of the optimum cutting processing conditions and the optimum cutting regime [4, 5]. With this object in view, the purpose of this paper is the optimization of the tool life and the cutting speed at the drilling of the stainless steels, in terms of the global indicator of the maximum productivity.
Applying the Networks Division Method for Studying the State of Deformation of Semi-Finished Sheet Submitted to Technological Cutting Operations
Authors: Stancioiu Alin , Luca Liliana
Published: August 2013

It is proposed to study the state of deformation of the material subjected to cutting technological operations. The study is based on finite deformation theory, according to which an elementary sphere imagined in the material subjected to deformation is transformed into an elementary ellipsoid. It used the method of grids or networks division applied semi-finished which was cut by two types of punches made from improved, unused OSC 10 and used OSC 10 after 15.000 cuttings. Also are analyzed the metallographic structures of the samples that are in different stages of penetration of the active cutting tool in semi-finished material. It is observed the deformation, the appearance and the structure for the action of the both punches on the semi-finished.
Economic Efficiency of Using Rapid Prototyping Technology
Authors: Gavrus Cristina
Published: August 2013

The present paper approaches the issue of using the new technology of Rapid Prototyping [1,2] in product engineering and tries to demonstrate its economic efficiency from the point of view of costs, in comparison with other technologies [. The comparison is made between Rapid Prototyping and plastic material injection. Rapid Prototyping is used for obtaining some prototypes but it also can be successfully used for individual or small series production. The background of the work briefly presented in this paper is related to some experimental research developed by the author regarding Rapid Prototyping Technologies for certain products which are belt pulleys. After the products have been physically created using Rapid Prototyping Technologies, the author was interested in quantifying its economic efficiency. The belt pulley the present paper refers to was obtained by using the Rapid Prototyping Technology FDM (Fused Deposition Modeling [).The working principle of this technology is briefly described later in this paper. As a novelty, the present paper is aiming at determining a criterion that allows a company to choose between the two technologies mentioned above.
High Pressure Water Jet Cutting of the Al 6061 T651 Aluminum Alloy
Authors: Herghelegiu Eugen , Radu Maria Crina , Schnakovszky Carol , Cristea Ion
Published: August 2013

Water jet cutting is an unconventional technology used for materials processing. It is known to be one of the most versatile and rapid cutting methods that can be applied to process a greater variety of materials such: metallic materials, non-metallic materials, stone, glass etc. By comparing with the classical technologies, the water jet cutting presents the following advantages: very low side forces during the machining; it is rapid; it is silent; no thermal distortion, high flexibility and has a good cutting accuracy and minimal burrs.
In this paper the influence of the high pressures on the surface quality of the workpieces processed by water jet abrasive cutting is presented. The studied parameters were as follows: width of the processed surface at the jet inlet (Li), width of the processed surface at the jet outlet (Lo), deviation from perpendicularity (u), inclination angle (α) and roughness (Ra).
Modeling by Finite Element Method of Thermal Field when Coating with Stellite Welding of Valvetype Parts
Authors: Gârleanu Gabriel , Popovici Victor , Gârleanu Delia , Luchian Cornelia
Published: August 2013

The paper presents the optimization results of coating by welding technology of the sealing surfaces of a rod-valve and seat assembly by using finite element programs. The assemblies - rod, valve and seat - are used for closing or opening track heat from heating systems used in power plants. The heat is given by steam that is found at a pressure of 400-450 atm and a temperature range of approximately 500°C. These values determine the use of materials of steels grades that are thermo resistant, alloyed with Cr and Mo, and work surfaces are coated with materials out of stellite grades (Co). To optimize parameters of the welding system and decrease heat loss, by conduction and convection, there were used programs of finite element to simulate the propagation of heat gradient acording to the parameters of welding regime.
Some Aspects Regarding Micro-Scale EDM Drilling Process
Authors: Dodun Oana , Panaite Carmen Ema , Gherman Lorelei
Published: August 2013

The abstract should be written after the paper is finished; it should state briefly the research problem, research methods and research results. The abstract length will not exceed 250 words. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. Please make the page settings of your word /left margins must be 2 cm (0.78 in). % by the publisher. Please keep this in mind when designing your figures and tables etc.
Comparative Analysis of the Quality of Parts Made by an Aluminum Alloy Processed by Unconventional Cutting Methods
Authors: Radu Maria Crina , Herghelegiu Eugen , Schnakovszky Carol , Cristea Ion
Published: August 2013

The emergence of new materials that cannot be processed by conventional methods (milling, turning and drilling) led to the unconventional processing technologies. In case of unconventional methods, the addition processing material is removed as microparticles, as results of the interaction between the workpiece and an erosive agent. Cutting of plates is a difficult and time consuming task, especially when the job calls for a tight tolerance or an unusual shape. The paper has as main objective to realize a comparative analysis of the surface quality and dimensional accuracy of worpieces made by an aluminum alloy, Al 6061 T651, processed by three different cutting methods: plasma, laser and abrasive water jet. Thus experimental investigation and comparative analysis of the results were performed in terms of roughness, macrostructure, hardness and dimensional accuracy of the processed workpiece.
The Corrosion Resistance of NiTi-Active Element before and after Thermo-Mechanical Solicitation
Authors: Ursanu Dragoş Adela , Stanciu Sergiu , Cimpoeşu Ramona , Ionita Iulian , Rațoi Mihaela , Constantin Titiana , Cimpoeşu Iulian , Agop Maricel
Published: August 2013

A shape memory alloy with medical applications was analyzed by corrosion point of view in Ringer solution before and after a thermo-mechanical solicitation. Scanning electrons microscope, EDAX and Potentiostat equipments were used to characterize the material surface and his behavior during and after an electric polarization. Pitting corrosion type was observed on the surface with more accentuated aspects for the fatigued sample.
Correction to the Wills-Harrison Approach: Influence on the First Minimum of the Effective Pair Interaction
Authors: Dubinin Nikolai
Published: August 2013

An influence of the degree of account of the non-diagonal couplings between d electrons sited on different atoms in a transition metal on the main characteristics of the first minimums of the Wills-Harrison (WH) effective pair potentials in liquid Fe, Co and Ni are investigated. It is found that at full aforementioned account the WH potential is transformed to the simple-metal-pseudopotential-theory effective pair potential and that first-minimum positions of WH potentials abruptly shift to right side at predominance of the non-diagonal d-d-couplings in a metal.
Application of Tree Graph Method for Reducing the Total Time of Tool Changing in Milling and Boring Machine Tools
Authors: Obreja Claudiu , Stan Gheorghe , Mihaila Lucian Adrian , Pascu Marius
Published: August 2013

With a view of increasing the productivity on CNC machine tools one of the main solution is to reduce, as much as possible, the auxiliary time consumed with the set-up and replacement of the tools and work pieces engaged in the machining process. Reducing the total time of the tool changing process by the automatic tool changer system can be also achieved through minimizing the number of movements needed for the actual exchange of the tool, from the tool magazine to the machine spindle (the optimization of the tool changing sequences). This paper presents a new design method based on the tree-graph theory. We consider an existing automatic tool changing system, mounted on the milling and boring machining centre, and by applying the new method we obtain all the possible configurations to minimize the tool changing sequence of the automatic tool changer system. By making use of the method proposed we obtain the tool changing sequences with minimum necessary movements needed to exchange the tool. Reconfiguring an existing machine tool provided with an automatic tool changer system by making use of the proposed method leads to obtaining the smallest changing time and thus high productivity.
Intelligent Management of Dies and Molds CAD Projects
Authors: Mocian Ioan , Cazacu Razvan
Published: August 2013

The current paper presents a methodology of archiving dies and molds CAD projects to quickly and easily find relevant parts from them based on clearly defined criteria. In a die and mold design workshop, existing projects from the archive are a very important source of ideas for ongoing or future projects, given the possibility to quickly access them. The proposed methodology is implemented in a distributed application. In principle the archiving process consists in filling a form with the project parameters. When engineers are searching for an archived project they inform the system about the characteristics they are looking for and the application returns the relevant projects and their location. The application is written in VB.NET and follows an object oriented approach. Being designed to connect to a database located on the network, it can be used by more companies in common or by the same company subsidiaries found in different locations.
Virtual Simulation of Plastic Injection Technology for Medical Devices
Authors: Catana Marius , Tarniţă Daniela , Diorduc Viorel
Published: August 2013

This paper aims to present the simulation of technological process of components made by plastic injection using a computer within a orthotic device for human knee. Also, the aim of the work is to improve the final product quality and operating properties in different types of design and minimize material requirements for different anthropometric data quality in optimal conditions. The orthotic device addresses to people with walking disabilities, and aims to rehabilitate and ameliorate the pain caused by osteoarthritis disease. For the geometric modeling of components in order to obtain virtual mathematical model study we used ProEngineer application, which allows a detailed design and a high accurate technical approach. The model was imported into the Moldex3D application, being integrated within a XYZ coordinate system.To simulate the injection process we used only the component from the upper part of orthotic device. This paper presents advanced modeling elements, geometric mesh model into an advanced form of nodes and elements, plastic injection process analysis settings. It highlights the tensions, deformations and displacements in these parts during the injection process.
Contributions on the Influence of the Cutting Parameters and Constructive Geometrical Parameters of the Tool on the Precision of the Worm Gears Manufactured Using Whirling Thread Cutting
Authors: Creţu Gheorghe , Coteaţă Margareta
Published: August 2013

ProblemThe whirling cutting is considered as the most productive method of manufacturing the worm gearing. In the case of up cutting manufacturing, where the tool and the worm gearing are spinning in the cutting area in the same direction, the thickness of the chips is increasing from the value zero to the maximum value, with a significant gradient. This fact has a negative effect on the tool face of the cutting tool, because it generates an accelerated wearing of this face, despite the major wear is on the side face of the tool. It is important to discover the influence of the parameters of the tool in the whirling cutting process.MethodThe precision parameters which were measured at the manufactured worm gearing were the tooth radial run out, frr, the error from the constancy of the worm pitch, fpxr, the profile error, fflr, and the minimal error of the thickness of the worm gearing thread, Ess.ResultsThe thickness of the manufactured tooth depends on the precision of settling the cutting depth that is, on its turn, dependent of the precision of the lathe carrier positioning in the transversal direction. It is hard to obtain a perfect settling of the initial cutting depth by using the method of first touch the cutting edges that are rotating continuously with the piece.
Parts in CATIA Based on Reverse Engineering Technique
Authors: Pescaru Roxana , Oancea Gheorghe , Parv Luminita
Published: August 2013

Increasing diversity of the products has led to the need of decreasing the design and manufacturing time. Subsequently, an important factor in reducing the design time is to produce parts families from the approached product components. This paper aims to present a method of achieving parts family starting from an iconic model of an existing product, without technical documentation. Firstly the Reverse Engineering (RE) technique is used, because it allows the digitization of the existing product using the 3D scanning equipments. This method supposes dividing the cloud of points, previously obtained, into independent components. Each component identified would be influenced by parameters with default values. This entire stage of parameterization is performed using CATIA software package. Using these components the parts family of the studied product is designed. The aim of the parameterization is to obtain a wide range of components, of various shapes and dimensions, once with the modification of the parameters that define them. Also, in this paper, will be presented a case study to highlight parts family resulted from the parameterized components, for a product belonging to the entertainment industry category.
Theoretical-Applicative Research on Design and Implementation of a Special Dynamometer
Authors: Inţă Marinela , Muntean Achim , Drăgoi Ciprian
Published: August 2013

The topic of he present paper is taken from the Automotive Systems Nurnberg, Sibiu. It refers to the product automatic gear box which equips a few FORD models, the specific part for which the research was developed being a auto screwing bolt for plastic which raises problems at the robotized screwing because of the poor knowledge of the accurate value of the axial force and the necessary torque.
The Influence of the Operating Conditions on the Lubrication Regimes of Ball Screws
Authors: Puiu George Constantin , Puiu Vasile
Published: August 2013

In point contact related applications (ball bearings, ball-screws) the minimum and the central film thickness of lubricant have a particular importance. The literature presents various numerical solutions to determine these parameters in the case of elliptical contacts [1-4]. Most of them refer to the fully developed elastohydrodynamic lubrication regime (EHD). Hamrock [5] proposes four different lubrication regimes depending on the size and importance of two physical phenomena that occur in contact: elastic deformation of the bodies in contact under a given load and lubricant viscosity variation of contact pressure. These four lubrication regimes have specific relations for calculating the two parameters. Also, Hamrock [5] develops a methodology for identifying the lubrication regime in a point contact, depending on three dimensionless parameters: the ellipticity parameter; the viscosity parameter; the elasticity parameter. According to the viscosity and elasticity parameters, for each value of the ellipticity parameter a map of lubrication regimes can be built. These parameters are influenced by the materials and geometry of the bodies in contact and operating conditions. By using the methodology [5] a comprehensive analysis regarding the lubrication regimes in contacts between balls and races of a ball screw drive has been done. Thus, a complex program to draw lubrication regimes maps, starting from an imposed geometry and from given operating conditions, has been developed. The developed maps have revealed the different lubrication regimes that can occur in contacts between the balls and races on the screw and nut. It was also revealed, for a given type of screw, which are the load and speed limits that allow transition from an isoviscous-rigid regime of lubrication (IVR) / hydrodynamic (HD) to an elastohydrodynamic lubrication regime (EHD). For each lubrication regime, relations were used for calculating the appropriate minimum thickness of lubricant film, hence the major importance of accurate knowledge of lubrication regime.
System for Compensating the Rigidity of the Hydrostatic Guideways of the Column Saddle Subassembly of the Boring and Milling Machines
Authors: Pascu Marius , Stan Gheorghe , Andrioaia Dragoș , Mihaila Lucian Adrian
Published: August 2013

The improvement of the machining accuracy of boring and milling machines is imposed by the more and more demanding conditions on the accuracy of the work pieces to be machined. The specificity of this family, of boring and milling machines, consists of the horizontal motion of the milling spindle (quill) with implications on the application point of the gravity center. Thus, the variation of the application point of the sum of the component elements weights of the column saddle subassembly leads to modifications of the oil film thickness in the hydrostatic guideways, affecting the geometrical accuracy of the machine. This work is presenting a system of compensation and hydrostatic guiding of the column saddle subassembly. This new compensation system allows the pressure in the pockets to be modified by taking in consideration the position of the application point of the weight of the entire column saddle subassembly. The implementation of this compensation and guiding system on the boring and milling machine model AFP 220 has led to an increasing of two times the geometrical accuracy of the horizontality of the column saddle`s motion, compared to the variant without compensation.
Researches upon the Maintenance of the Railway Wagons Brake System
Authors: Orhei Bercea Bianca Silvia , Lupescu Octavian , Bercea Lucian Dumitrel
Published: August 2013

It is known that the brake system maintenance of the railway wagons involve also, among others, the replacing of the brake shoes when their wear in time exceeds the maximum allowable limit. This requires creating a reserve of such spare parts in companies carrying out maintenance of such equipments. Management of the stocks needed to be created can be solved by applying various methods, depending on the certainty or uncertainty knowledge of the level necessary for the spare parts demand, of their delivery time and size of supply costs. The company in which researches was conducted did not apply optimization policies for corrective maintenance, in the idea of non-blocking in irrational stocks the company financial resources. So that, the authors propose as a working method, for solving a particular case, a deterministic storage model of the brake shoes with instantaneous supply of this spare parts, when absence in stock may be accepted. The researches result consisted of determining the brake shoes economic batch size and their optimal replenishment period, at minimum total costs. It was also determined, in this case, the minimum required level stock, as well as, its existence time and the absence in stock. Intensity index of the stock split determination will also allow, the brake shoes probability deplation.
Aspects of Mathematical Modelling of Heat and Mass Exchange at Burning of Droplet of Water Fuel Oil Emulsion
Authors: Buzdugă Ştefania Roxana , Sajin Tudor
Published: August 2013

This paper presents some aspects regarding modelling of heat and mass exchange at burning of droplet of water-oil emulsion (WOE). Based on nonstationary differential equations of conservation of energy and matter in the liquid and gaseous phases, it was formulated a physical and mathematical model of heat and mass exchange in system of WOE drop-elementary gas cell. Unlike other models, in this model is taken into account the dependence of thermo physical properties of phase by temperature. The heating, micro explosion, vaporization and combustion stages of droplet burning were considered. For numerical solution and computer simulation of mathematical model has been developed an algorithm in Mathcad14 software. The numerical results were validated experimentally.
Procedure and Equipment for Circularity Test of Inner Section of Bent Tubes
Authors: Pisarciuc Cristian
Published: August 2013

The article goal is to presents a test procedure and experimental equipment for testing inner section of bent tubes. In view of the fact that it is an important component, a test method should be created to see the variation of circularity, which could determines the pressure drop in the tube. This test procedure is necessary because the geometry of the tube is composite and material is not so thick so there are critical points along the tube. Because the geometry of the tube is not so easy to acquire, a way of testing it is to verify the pressure drop between the ball and the tube wall. The possible pressure lost is an indication of the form variation in normal section of the tube. In a first instance a simple solution is presented that could solve the testing problem with the advantage of being not priced. The second solution is an improved, automated one that implies some common electronically devices that can solve some of the drawbacks and the first.
Improving Teaching Staff Lifelong Learning Using Fuzzy Algorithms
Authors: Butnaru Camelia , Nedelcu Anișor
Published: August 2013

Today, on the labour market daily are recorded a lot of changes (legislation, migrations, etc.). The need of continuing education can be foreseen related to the big number of companies (private or public) which are looking for the right person to be hired on the right position. Unfortunately, very often the enterprise engages a person that will be trained later according to the companies future needs. The paper presents a software application (SFCD) proposed to the training responsible to help them to choose the teachers from the pre-university system that can be financed from public funds to follow continuing educational programs. The engine of the SFCD application is based on fuzzy inference system and the programming language used was Visual C++ [5]. The paper describes Academica (I, II and III) programs that are running since 2005 at Transilvania University of Brasov, Romania, which main aim is to enhance teaching skills and specific competences to the pre-university staff. The structure and importance of each program, the activities offered to the trainees, the novelty feature of the programs, the assessing and some concluding remarks are here presented [1].