bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Quality Control of the Affordable Housing from Governments Perspective
Authors: Wang Qian Kun , He Chen Chen , Zuo Wei Wei
Published: August 2013

Based on cause analysis of quality defect in affordable housing, solutions are proposed from the perspective of government. And then the ranking of their importance is figured out by AHP based on evaluation criteria of comprehensive consideration of quality, strengthening supervision and balancing quality and profit-driven developers to help government allocate resources effectively to improve the quality of affordable housing. It is found that government should build synthesized management department and use various methods reasonably according to their orders of importance to ensure the quality of affordable housing.
Construction Information Management Based on BIM Technology
Authors: Wang Qian Kun , Mei Ting Ting , Zu Zhan Liang
Published: August 2013

With the development of project management theory and information technology, construction project management begins to information and integrated in China. This paper discusses the application of the shared model in construction stage by applying the concept of Building Information Modeling. The method of construction whose object is to accomplish construction information management in the real sense is presented in the platform of BIM technology.
Analysis of Some Problems about the Detection Capabilities of the Drinking Water Quality Standards
Authors: Gao Yu Nan , Tang Xiang Yu , Fu Jin Xiang , Liu Shui
Published: August 2013

The numbers of index of Chinese standards for drinking water quality increased from 17 by the Health Regulation for Drinking water promulgated 1959 to106 by the current Standards for Drinking Water Quality (GB5749-2006). The Standard has been developed at the same pace with the world. However, there were some hysteretic problems in the process of standards implementation due to the detection technique. The article was aimed at making suggestions on improving detection capability and testing equipment, making programs on the technical personnel and the regional differences. The present research results will lay the foundation for the implementation of Chinese standards for drinking water quality.
The Evolution Research of Urban Morphology of the Changbai Mountains Surrounding Cities - Illustrated by the Case of Four Typical Cities in Jilin Province
Authors: Lv Jing , Chen Wen Jing
Published: August 2013

This article sort out and research the urban morphology of the surrounding area of Changbai Mountain, the paper selected four typical cities in Jilin Province: Dunhua, Tonghua, Jiaohe, Huadian, analyze the Changbai Mountains surrounding urban morphology development models from the historical, economic, social, geography and spatial morphology aspects, and give specific improvement measures to the development and construction of the surrounding urban morphology layout in the future.
Inner Mongolia Grassland Nomadic Living Space of Modular Theory
Authors: Ma Ming , Li Yong , Kong Jing , Wang Juan , Zhang Min , Wang Wen Ming , Su Hao , Qiu Li , Kang Jing , Chen Wen
Published: August 2013

Theoretical research based on a modular, the steppe nomads living building "prototype" of Mongolia as the research object, analyze the function of the use of nomadic living space, through the analysis of modular grid of internal space, to create modular interior space, combined with fixed brick to diversify the design, providing humanized design for the grassland mobile residential construction, improve pastoral living space environment has practical significance.
On Re-Understanding of Waste Landscape
Authors: Di Wang
Published: August 2013

The landscape has traditionally been defined as a art organize various horizontal surface, through close attention to the condition of the surface, not just the structure, but also the material and its aesthetic characteristics - designer active in shaping the space and urban vitalitycan be generated without the aid of traditional space. This article is intended to explore in the context of urbanization and inverse industrialized in re-understanding of the situation and development trend of abandoned landscape.
Risk Analysis of Regional Energy Efficiency in China Based on DEA
Authors: Liu Shu Liang , Wang Yan Min
Published: August 2013

Energy is the foundation of modern social economy, and energy efficiency is an important issue that various countries concerned. By using the Data Envelope Analysis (DEA) method, we studied Chinas regional energy consumption and treatment situation of waste water and air pollution. So we can draw the conclusion that energy efficiency is generally good in the South China, the Northeast and the Northwest, which energy efficiency risk is low. But the efficiency is low in the North China and the East China. At the same time, the returns to scale of energy are decreasing in the North China, the East China, the Central China and the Southwest, so they should reduce the consumption of energy and enhance the treatment of waste water and air pollution, in order to reduce the Chinas regional energy efficiency risk.
Optimization of Capacitive Deionization for Salt Removal from Water with Response Surface Methodology
Authors: Zhao Yan , Hu Xiao Min , Jiang Bin Hui , Ye Shu Fan , Li Liang , Tian Zhong , Wang Yu Jia
Published: August 2013

A efficient treatment method capacitive deionization (also called electrosorption) against high salinity and ionic concentration in wastewater or groundwater was discussed. Response surface methodology was used to investigate the effect of electrodes potentials, distance between electrodes plates and flow rates on the desalination rate from water. A quadratic response surface model and optimum level values were obtained based on experimental data under box-behnken design (BBD) of software Design-Expert 8.0. The results showed that the maximum desalination rate was 59.05% on the optimal conditions of potentials, distance between electrodes plates and flow rates were 1.6 V, 2 mm, and 21.32 ml/min, respectively. The analysis of variance on quadratic response surface model indicated that regression model reached significant level, fit well and its reliability and accuracy were in the practicable extent, coinciding with the experimental results perfectly.
Study on the Ecological Characteristics of the Seaweed House in Jiaodong Peninsula
Authors: Kuang Fu Chun , Yu Xiang
Published: August 2013

The Chinese folk dwelling reflects the ideology of adjusting measures to local conditions and harmony between the heaven and human from the space layout and building details. Taking the seaweed house in the coastal areas of the Jiaodong Peninsula as the object of the study, this paper analyzed the ecological characteristics from the historical origin, building layout, building form and building space. And based on this, it revealed the ecological values and to provide the theatrical basis to local ecological building design.
Geological Environment Suitability Evaluation and Function Regionalization in Zhongyuan Urban Agglomeration
Authors: Chen Yu Ru , Ma Chuan Ming
Published: August 2013

In order to make rational use of geological resources; reduce the occurrence probability of geological hazards and environmental geological problems effectively; accomplish the coordination between functional layout and geological environment, this paper uses analytic hierarchy process (AHP) based on triangular fuzzy number to decide weight and sensitive factor evaluation model to evaluate the geological environment suitability in Zhongyuan Urban Agglomeration. Geological environment function regionalization is completed based on the evaluation results before under MAPGIS platform. Study result shows that geological environment functional region for basic construction land is mainly distributed in the regional city center within a certain radiant scope. The functional region for agricultural production land is mainly distributed in central hill region and eastern plain region of the research area. The functional region for environmental protection land is mainly distributed in northern and southwestern mountain region of the research area, as well as zones along the Yellow River and Middle Route in the South-to-North Water Transfer Project.
The Applicable Technical Analysis of the Small Towns Domestic Sewage Treatment in Yunnan Province
Authors: Liang Dong Hua , Xu Bing Feng , Wang Xun
Published: August 2013

This paper summarized the actual situation and problems of domestic sewage treatment in small towns in Yunnan province, and recommended four suitable sewage treatment technologies combining with its domestic sewage treatment process for water treatment, project investment, land allocation and operating cost analysis.
Indication of Magnetic Susceptibility to Heavy Metal Pollution in the Typical Contaminated Areas of Southern Jiangsu Province
Authors: Wu Cai Qiu , Yuan Xu Yin , Li Tian Yuan , Zhao Xue Qiang , Liao Qing Ling
Published: August 2013

Magnetic susceptibility characteristics as well as the relationships between magnetic susceptibility and As, Hg, Cu, Pb, Cd, Cr were investigated in the typical contaminated areas of southern Jiangsu Province.It was found that the correlations between magnetic susceptibility and Cu, Pb were relatively significant, while the correlations between magnetic susceptibility and Cd, As were weak. Heavy metals in soils from industrial wastewater discharge were associated with the magnetic susceptibility, which showed better correlation than other pollution sources.The primary component analysis showed heavy metals in soils from Nanjiao area were mainly the dust from metallic factory , Source of heavy metals in the soils of Ehu area showed the close relationship with the industrial wastewater source in this area.Characteristics of heavy metals in Dingshu area were associated with the source of the mixed wastewater.It is apparent that the different sources will lead to the changes of the correlation between heavy metals and magnetic susceptibility. Generally,the relationship between heavy metal and susceptibility is good in the soils irrigated with industrial wastewater, and metals from the mixed wastewater show a relatively poor correlation with the magnetic susceptibility.
Relationship between Chinese WeiHai Urbanization and Climate Change
Authors: Huang Tian Hang , Dang An Rong , Liu Rui Lin , Zhu Zhan Qiang , Zhang Dan Ming , Li Shan Tong
Published: August 2013

Because of speediness urbanization, the numerous greenhouse gas is being let because of human activity. The impact of the associated factors on the metropolitan area is the hot research area. This paper focuses on the numerical simulation of weihais meteorological parameters, including atmosphere temperature and rainfall, trying to find establish a method to research the relationship between the urbanization and the climate change.
Balancing Growth and Preservation: Protection and Management of Nanxun Historic Water Town
Authors: Jin Shan , Huang Hai Bo , Liu Kun
Published: August 2013

Today in the context of contemporary rapid economic and social development many of the Chinese historic sites are being destroyed to make a way for new development, which is resulting in the abrupt disappearance of character and identity of the unique places. Nanxun historic water town is the most representative and unique water town in South of the Yangtze River. This paper analyzes the outstanding universal value of Nanxun historic water town, addresses the factors affecting the town such as development pressures, tourism pressures, and environmental pressures. It proposes the protective strategy for water towns in South of the Yangtze River, so that it can provide the useful experience for other historic sites in China.
Life Cycle Assessment on CO2 Reduction of Street House Reuse
Authors: Chao Yu Chan , Jheng Wei Liang
Published: August 2013

To estimate the benefits of reuse building, this study selected 8 street-house cases from ¡§Old House, New Life reuse movement and calculated the average CO2 emissions of rebuilding and refinishing in their life cycle. The results indicated that the average CO2 emission is 103.14 kg-CO2 /m2 before renovation, and 5.73 kg-CO2 /m2 after renovation. The efficiency of CO2 emission reduction can be raised up to 60% and 70%. If the street houses extend their life span from 60 years to 90 years, the life cycle CO2 emissions can be reduced from the original 1.89 kg-CO2 /m2¡Eyr to 1.39 kg-CO2 / m2¡Eyr. It's advantageous not only to make the best of old houses, but to decrease the environmental load.
Methodology of Measurement and Calculation of Building Energy Management System in University Campus
Authors: Su Yuan , Yan Jun Wei
Published: August 2013

Nowadays, the necessity of university as leader of reducing GHG emission has become an issue of global concern. In this research, we aim to analyze energy system of a model university campus in southern China and grasp the energy consumption of the whole campus from the viewpoint of reducing GHG emission. We investigated and analyzed the present situation of energy system by using measured data and inquiry survey. In order to grasp the data exactly, we introduced building energy management system (BEMS) to some typical buildings with electricity consumption controlling. Firstly, the outlining of the campus and abstract of the buildings were carried out. Secondly, measurement buildings of BEMS in the campus were described according to the results of investigation. Furthermore, methodology of measurement and calculation was researched. The campus's daily electricity consumption and cooling consumption, hourly energy consumption intensity of different typical building, and consumption intensity of different days (weekdays, weekends, and holidays) could be examined using this methodology.
Strategy on Architectural Specialty Curriculum System Update under Energy Saving Emission Reduction Policy-Oriented
Authors: Lu Mei Jun , Wang Gui Xiu
Published: August 2013

In recent years, a series of building energy efficiency regulations and policies in China were promulgated.Therefore, the talent relating to building energy saving has become the urgent needs in the community,but the talent training model of architectural higher education can not make system supplements and adjustments.The necessity for architectural specialty curriculum system update was analysed comprehensively. Under energy saving emission reduction policie-oriented, curriculum system update and cultivating the continuity on energy saving ideas in design courses were put forward. And then ordered butt joint on architectural talent cultivation and national energy-saving emission reduction policies can be achieved.
Numerical Simulation on Ventilated Cavity Flow with Different Turbulence Models
Authors: Hu Xiao , Xiong Yong Liang
Published: August 2013

The gas leakage and capabilities in cavity tail-part can affect the characteristics of ventilated cavity shape, while turbulence models influence directly the function of turbulence and gas-leakage mode in cavity tail-part. To compare the impact of two turbulent models (large eddy simulation (LES) and Renormalization Group (RNG) k-ε) on ventilated cavity shape, FLUENT6.2 software was used to simulate the three-dimensional ventilated cavity flow, taking into account gravity effects, the cavity transient image and pressure distributions along model surface under two turbulence models were also presented. The results show that the results of LES are more consistent with the transient characteristics of ventilated cavity, and are more suitable for simulations of ventilated cavity flow than RNG k-ε model.
A Study on Actual Conditions of Residential Environment in Western Region of China Part 2. A Concept for a Bio-Village in Sunan Yugur Autonomous County
Authors: Yoshino Yasuko , Qian Ye Bei , Wang Yan , Liu Jia Ping , Ikeda Koichi , Yang Liu , Ichiyanagi Tatsunobu , Kumada Kazuaki
Published: August 2013

We have directed at the climatic and residential environments and local residents of western China. It is founded on Japan-China joint research, built on physical measurements and questionnaire surveys that enable healthy and sustainable development, on the basis of assessment of the climate and environmental characteristics of western China. Additionally, the project aims at proposing convenient methods to protect people against the adverse health effects of climate change, looking at inhabitants. Focusing our attention on the state of housing in rural parts of Sunan Yugur autonomous county and on the characteristic abundance of natural energy resources, we set out to develop a new model for energy-efficient housing adapted to available natural energy sources. This Bio-Village concept is one of the nomad settlement plan, and in consideration the lifestyle coexisting the traditional life and livestock industry, we aim to achieve compatibility of local business development and energy conservation village.
Analysis on the Relationship between Typical House Mode and Heating Energy Consumption in Cold Rural Areas of Eastern China
Authors: Zhang Xue Yan , Chen Bin , Liu Yan Qing , Han Xv Liang
Published: August 2013

In cold rural areas of Eastern China, heating energy consumption was increased year by year, affected by some factors such as building materials, different courtyard layouts and residential constructions. Based on field measurements and multiple perspectives analysis of typical houses, the heat of cold air infiltration in one house could be reduced by 18.3 %, while the courtyard design was adapted to local climatic conditions. Heating energy consumption could be reduced by 15% for reasonable energy utilization, and which could be reduced by 50% for rational design of building layout and correct selection of materials for building envelope.
Experimental Investigation on Flow Characteristics of Supercritical CO2 in a Helically Coiled Tube
Authors: Wang Shu Xiang , Zhang Wei , Xu Jin Liang
Published: August 2013

Under the background of global warming, carbon dioxide among natural refrigerants has attracted considerable attention as an alternative refrigerant. In the present study, experimental investigations of the fluid flow characteristic of supercritical CO2 in a helically coiled tube with the inner diameter 9.0 mm, coil diameter 283 mm and coil pitch 32 mm were carried out. Both frictional pressure drop and friction factor were obtained under the pressure of 8.0 MPa, mass flux from 0 to 600 kg/m2s and inner heat flux from 0 to 20 kW/m2. The results indicate that inner wall heat flux and mass flux had significant effects on fluid flow characteristics. The study provides experimental data that could be used for the design and development of more efficient exchangers for refrigeration conditioning, heat pump and some other systems.
Research on the Cognitive Evaluation Method of Communication Spaces in the Dormitory Buildings Environment of Universities
Authors: Guo Hao Xu , Deng Meng Ren
Published: August 2013

By using the communication spaces of two dormitory buildings in a certain South-China university as studied samples, this paper deals with the ways to utilize, cognize and evaluate them in the aspects of recessive psychology and dominant behavior, namely to know about the information regarding the use of evaluated objects-not only the situations of users but also their personal experiences,. So, it is possible for the author to devise a qualitatively analytical method to find out the using forms of varied communication spaces as well as the use frequencies and laws, thus being beneficial to the designs and analyses of communication spaces.
Development of a New Non-Chloride Snow-Melting Agent
Authors: Wu Yu Hui
Published: August 2013

This paper shows a method to develop a new non-chloride snow-melting agent to fight against snow and ice covered on the road in winter by recycling and reusing byproducts of nylon industry to make full use of waste and reduce environment. The agent doesn’t have Cl- and is friendly to environment. Furthermore, the snow-melting agent performances are evaluated. The results show that the CM-DBA is better than CMA on many aspects and better than chlorides except on melting snow and ice performance.
Modeling of Blast-Induced Craters by Multi-Material ALE Method
Authors: Han Zao , Wang Bo Liang , Zhang Zhi Chao
Published: August 2013

Multi-material ALE method combines the advantages of Lagrangian and Eulerian methods, avoids mesh distortion of the Lagrangian method, and eliminates moving boundary problems of the Euler method. A numerical simulation of blast-induced craters in geotechnical medium was performed within the frame of LS-DYNA by multi-material ALE method. The simulated crater which coincides with the empirical data from CONWEP was observed in post processing by the flow of material. This demonstrates that the multi-material ALE method is an effective way to simulate blast-induced craters in geotechnical medium.
Preparation and Characterization of Biodegradable Cotton Mulching Film
Authors: Luo Jun , Chen Zhi , Zhang Kai Yan
Published: August 2013

The extensive use of plastic film has caused serious environmental pollution. In this paper, the fully degradable cotton mulching film was produced from waste cotton fiber by wet papermaking process. The breaking strength, tearing strength, degradation rate, transparency, air and moisture permeability of the cotton film samples were tested and analyzed. The results show that the cotton mulching film has better mechanical properties, light transmittance, and excellent degradation characteristics.
The Effect of Panax japonicus C. A. Mey. var.major (Burk.) C. Y. Wu et K. M. Feng on the Oscillation System
Authors: Suo Jian Lan , Zhao Wei Wei , Liu Dai Huo , Han Xiao Dong , Liu Jiao , Mi Xiao Hu
Published: August 2013

s: We have studied the oscillation behavior of Chinese herb medicine Panax japonicus C. A. Mey. var.major (Burk.) C. Y. Wu et K. M. Feng in oscillation reaction system acetone-KBrO3-MnSO4-H2SO4. Also discussed the effects of concentration of substrate, H2SO4, KBrO3, Mn2+ on the period, amplitude and life of oscillation. The action of each substance in the oscillation system was verified. It provided a new way for herbal medicine identification.
Selection and Application of Suburban Residential Evaluation Based on Rough Set
Authors: Qi Xi Jing , Xu Xiao Dan , Sun Hong
Published: August 2013

According to Chinese housing status and characteristics of suburbanization, learning from the experience of foreign suburbanization, based housing performance technical standards and questionnaire of Shenyang 2013 people purchase needs, unit plane, residential condominiums, 10 residential properties identified indicators including unit plane and residential condominiums are selected. Using rough set theory with engineering examples, preferred and established a widely used value prices, public service facilities, land using and planning three suburban residential evaluation and brief evaluation of suburban residential applications, at the same time gives some recommendations about the optimization and transformation of residential construction in the suburbs.
Multi-Objective Optimization Design of Steel Frames Based on Multiple Attribute Decision-Making Method
Authors: Cui Mao Qiao , Huang Hai Yan , Wang Fu Lai , Qiu Yong
Published: August 2013

This paper describes in detail a multi-objective optimization strategy and decision-making method in the process of steel frame optimization design. A step-by-step analysis process integrating optimization algorithm and model analysis is proposed to solve the present problem. A multi-objective algorithm method using fast Non-dominated Sorting Genetic Algorithm is employed to obtain the Pareto-optimal solution set through an evolutionary optimization process. A high-level multiple attribute decision-making method based on intuitionistic fuzzy set theory is adopted to rank these solutions from the best to worst, and to determine the best solution. An example is used to demonstrate the proposed optimization model and decision-making method.
Application of Steel Bar Truss Deck Construction Technology in a Large Steel Project
Authors: Wang Chun Ming , Zhao Xin , Wu Mai , Liang Jun Li , Gu Zon Gang
Published: August 2013

Steel bar truss deck is a kind of combination template which is processed into steel trusses with steel, and welded steel bar truss and galvanized steel sheeting into a whole. It has many advantages such as economical, convenient, safe and reliable, etc. It can withstand the concrete weight and construction loads and installed directly on the steel beam without support at the bottom. This paper introduces the construction technology of steel bar truss deck with Tianjin Museum engineering examples. The technology has made a better construction, and ensured the construction period and the quality of the project in this project.
Effect of Nitrite Concentration and pH on Steel Corrosion Induced by Sulfate in Simulated Concrete Pore Environment
Authors: Cao Zhong Lu , Hibino Makoto , Goda Hiroki
Published: August 2013

The effect of nitrite on steel corrosion induced by sulfate in three simulated concrete pore environments has been investigated by means of half-cell potential, linear polarization resistance and visual examination, as well as sulfate-induced corrosion is compared with chloride-induced corrosion. The results indicate that with the presence of nitrite, sulfate-induced corrosion can be inhibited effectively. Sulfate threshold level increases with the increasing of nitrite concentration and highly alkaline environment plays an important role in assisting nitrite to inhibit sulfate-induced corrosion. Chloride-induced corrosion is more prone to initiate than sulfate-induced corrosion in highly alkaline environment but in neutral environment, when nitrite content is equal to or less than 0.053mol/L, sulfate-induced corrosion is more likely to occur than chloride-induced corrosion.
Influence of Aggregates on Cracking Sensitivity of Concrete
Authors: Chen Xia , Shi Yan , Lin Yu Qiang , Li Xiang , Zhou Shi Hua , Xiao Kai Tao
Published: August 2013

Upon large demands from southwest of China where a large number of hydropower stations are schemed or under construction with presence of a variety of aggregates, it is of necessity to launch a comprehensive investigation on influence of aggregates on properties of concrete which was rarely reported before. Four types of aggregates selected from different construction sites were used to conduct tests, and results indicated that water absorption of aggregates exhibited a consistent rising tendency over 180 days and it had close relationship with autogenously shrinkage of concrete which varied in the manner that high water absorption of aggregates produced more obvious shrinkage. With employment of advanced temperature and stress machine, concrete made with diorite and basalt was rated better than limestone and natural granite concrete in crack resistance based on comparison of cracking temperature and thermal impact according to RILEM TC119.
Average Daily Shading Factor Variations with Aspect Ratios for Different Flat-Plate Collector Arrays
Authors: Hu Fen E , Wei Sheng Xian , Wang Zhi Juan
Published: August 2013

A model to calculate the average daily shading factor of flat-plate solar collector array installed on the limited horizontal roofs has been developed. The relations between the average daily shading factor and the aspect ratio of the collector array have been deeply studied. The results show that for the collector array with the floor area from 50 m2 to 1000 m2, the smaller the floor area, the faster the increase of the average daily shading factor with the increase of the aspect ratio. The average daily shading factors do not exceed 0.085 for the low latitude regions (lat. 30o N), whereas the maximum average daily shading factors can reach 0.140 when the latitude is close to 40o N.
High Precision Rotary Table Used on Milling Machining Centres
Authors: Mihaila Lucian Adrian , Stan Gheorghe , Obreja Claudiu , Pascu Marius
Published: August 2013

The latest milling machining centres have in their structure a rotary table which is used for machining up to 5 faces of an workpiece using only one set-up. In order to meet the requirements of an workpiece, that are more and more precise, it is recommended to increase the positioning accuracy of the machine tool table and also the number of indexing points.
In this paper we present a new rotary, palletizing table which is provided with 360000 indexing positions and at every 4x90° the indexing precision is ±1``. This solution can be integrated in the structure of milling machining centres which adopt pallets with the nominal size from 400x400 mm to 800x800 mm. The table rotation axis is closed-loop controlled and is actuated by a servomotor with variable speed. The presence of speed and position control in the table`s structure assures the obtaining of high quality indices superior to classic feed systems. The kinematic feed chain has in its structure a duplex worm gear which guarantees the transmission without mechanical clearances. Also the table is provided with a high precision pallet positioning and clamp/unclamp mechanism which attains a position repeatability of ±2``. The advantages of the presented solution find themselves in the general characteristics of the machining centre, providing it with new performances in increasing the precision of the machined workpiece.
Influence of the Blankholder Force on the Accuracy of the Rectangular Drawn Parts Made from Steel Sheets
Authors: Nanu Neculai , Brabie Gheorghe , Bologan Maria
Published: August 2013

In the case of sheet metal forming process one of the most important phenomena that affect the dimensional and shape accuracy of the formed parts is the part springback after the tools removing. The springback phenomenon depends, on the one hand by the material mechanical parameters (especially Youngs modulus, anisotropy coefficient, yield stress) and on the other hand by the process parameters and tools geometry. Therefore in order to control the springback for a given material, the influence of the process parameters or tools geometry must be know. The aim of the present paper is to investigate the effect of blankholder force (as process parameter) on the springback parameters in the case of rectangular parts made from steel sheets. The investigations were made both experimentally and by finite element simulation. The springback parameters of the obtained parts were determined by using the ATOS system and ATOS software that allows the virtual reconstruction of the part shape in order to measure the springback parameters. Both experimental and simulation tests shown that the use of a high value of blankholder force leads to the increase of the drawn part accuracy.
Simulation of the Pressing Process with Combined Forces by Using ABAQUS Software
Authors: Mardari Alexandru , Mazuru Sergiu
Published: August 2013

Actual for machines building is it the problem of finding technological solutions to increase the quality of parts, increase productivity and save resources. Greater interest in it shows the materials that incorporate a range of mechanical proprieties. In this category it is joining metal powder as material, and parts thereof, which occupies a significant share in parts manufacturing having improved and special proprieties. The present work is carried out simulating metal powder pressing process by application of combined forces. To describe properties of metal powder was used Drucker-Prager cap model.
Mathematical Model for Economic Optimization of the Tool Life and the Cutting Speed at Drilling of the Stainless Steel X6CrNiTi18-10
Authors: Blăjină Ovidiu , Vlase Aurelian , Darie Vlad
Published: August 2013

The problems related to the wear of the cutting tools wear and the tools life at the machining of the stainless steels are very important due to the chemical and mechanical characteristics of these steels [1]. Over time the research have studied the causes which produce the cutting tool wear and the methods to improve the cutting tools durability, either by creating new types of materials for tools, either by the choice of tools geometric parameters and cutting regime [2, 3]. The purpose of this paper is the optimization of the cutting tool life and the cutting speed at the drilling of the stainless steels, in terms of the global indicator of the minimum machining cost.
Methods to Increase the Rigidity of the C-Frame of a Press
Authors: Dan Ioan , Cioară Romeo
Published: August 2013

Reducing exploitation energy consumption for any technical system is an effective way, which is in complete accordance with the concept of sustainable development [1]. The presses, particularly the mechanical ones, are machine tools with a long-term exploitation [2]. At these ones, the operating energy consumption, significant in value, decreases only if the rigidity of the structure of resistance increases, including that of the frame. Several analytical models, developed and studied by the authors, confirmed the hypothesis that a solution to increase the rigidity of a mechanical press with open frame is obtained by shortening it. Moreover, it occurs also a slight decrease in material consumption integrated into the frame, which is a favourable effect. There have been developed more new constructive solutions [3, 4], characterized by minimal changes to the reference design solution, that of the press frame PAI 25. The new suggested constructive solutions are obtained as 3D models, accomplished in Pro Engineer Wildfire 4, and the finite element analysis was made in Catia V5 R16. The present paper shows results on increasing stiffness and reducing stress state for a few constructive solutions of shortened C-frame, having reduced distance between the working surface of the table and the spindle bore axis.
Rapid Manufacturing of Microwave Circuits on Low-Cost Substrates Using Laser Machining
Authors: Ghulam Mehdi , Hu An Yong , Miao Jun Gang , Gherman Lorelei
Published: August 2013

Microwave and millimeter wave (MMW) planar structures are sensitive to printed circuit manufacturing tolerances. A promising alternative to the conventional photolithographic fabrication technique is laser structuring. This paper presents the study and the experiments conducted to investigate the possibility of employing low-cost commercially available substrates for microwave and MMW circuits using laser ablation process. At least two of such materials (a) glass reinforced ceramic filled teflon (PTFE) and (b) glass reinforced hydrocarbon have been used to design and fabricate microwave and MMW passive structures such as edge-coupled bandpass filter (BPF) using laser machining. The experimental results exhibit the suitability of glass reinforced hydrocarbon materials for microwave circuits employing laser ablation process. However, it is deduced that the laser ablation process alters the complex permittivity characteristics of the ceramic filled PTFE materials. The measured results of laser ablated passive structures on both materials are presented along with the simulation results.
Influence of the Distance between the Cutting Head and Working Sample on the Geometric Precision in Water Jet Abrasive Cutting Process
Authors: Herghelegiu Eugen , Radu Maria Crina , Schnakovszky Carol , Cristea Ion
Published: August 2013

Water jet cutting is an unconventional technology used for materials processing. Abrasive water jet cutting has become a highly developed industry technology. Its development has been favored by the fact that abrasive water jet cutting can be used in practically all areas in which solids are processed stone, glass, plastics, composite materials and metals. 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. 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. The aim of the present paper is to present the results of the study regarding the influence of the distance between the cutting head and working sample processed by abrasive water jet cutting on the surface roughness and dimensional accuracy of the processed part.
The Influence of the Diffusion on Adherence of the 60T Deposits Obtained by Thermal Spraying in Electric Arc
Authors: Toma Stefan Lucian , Gheorghiu Diana Antonia , Radu Steluta , Bejinariu Costică
Published: August 2013

The physic-chemical and mechanical properties of steel deposits obtained by thermal spraying depend on technological parameters of the spraying process. Generally, wear resistance of the deposits depends on the degree of porosity and the adhesion of the layer to the substrate. In the case of the deposits obtained by spraying, studies have shown that between deposited layer (SD) and substrate (S) there are the following types of adhesions: mechanical, metallurgical, superficial, physical and diffusive. Each type of adherence, enumerated above, works through a well-defined mechanism so that it can be said that the adhesion of the obtained deposits by thermal spray is a sum of mechanisms which interacting. How these mechanisms interact, as well the percentage of the influence is determined by: operating parameters, by the deposit material and thermal treatments after the deposit obtaining. This paper proposes to determine the influence of thermal treatment on adherence of 60T deposits obtained by thermal spraying in electric arc- as a thermal processing method after metallization. The assessment of adherence deposit 60T - in two ways, according to with EN 582 and DIN 27201/2005 in conjunction with the investigations of electron microscopy (SEM), XRD analysis, and image analysis performed at both the zone: Coating - Interface - Substrate (CIS) has revealed the presence of diffusion and the structural constituents. The graphs of adherence variation for 60T deposits with the concentration gradient of the alloying elements of the 60T layer respectively of adherence layer (75B) obtained experimentally by investigations carried out on the substrate have demonstrated the role of the secondary thermal treatment on the deposit adherence.
Structural and Technology Support Quality Improvement of Gear Coupling
Authors: Mikhaylov Aleksandr , Grubka Roman , Lahin Aleksey , Nedashkovskiy Alexander , Guitouni Ahmed
Published: August 2013

In this work the question of sharing use a thermo-mechanical treatment method and forming spatial tool based on a kinematic method researches gearings, is considered. Also, the method of thermo mechanical treatment a gear couplings teeth, with the receiving a spatial teeth geometry and ensuring required physical- mechanical properties of them, is presented. For implementation of this method, the scheme of the device and the special tool is developed, which allows to fair blanking of spatially modified teeth. The design procedure a teeth tool’s geometric parameters of the line addendum modification are offered.
Studies Concerning Variation of the Friction Coefficient in Case of Polymeric Composite Materials Reinforced with Carbon Fibers
Authors: Caliman Radu
Published: August 2013

Thanks to their low density, good thermal, mechanical and tribological properties, composites made of carbon fibres and epoxy are particularly adapted to the manufacturing of aircraft brake discs. Several methods have been developed to improve their performance. The purpose of the present study was to evaluate the influence of different epoxy/carbon fibers ratio enhance modification on the friction behaviour and to identify the related mechanisms. Nine different hybrid matrix composites were elaborated. These samples were submitted to structural and mechanical characterization, then to friction and wear tests using a pin-on-disc tribometer, at ambient temperature and humidity, constant rotating speed, varying the loading pressure. As the content of carbon fiber increased, the wear rate of the composites trended to increase. Under the friction condition of high applied load, the friction coefficient inclined to decrease while wear rate increased. When slided under a relatively high load of 12 daN, the wear resistance behaved was better as the content of carbon fiber increased. The aim of the present study was to understand the friction mechanisms of these composites, dealing with the effects of varying the carbon fiber concentration within the matrix, not only on the tribological behaviour but also on the superficial mechanical properties.
Object Oriented Finite Element Analysis on Microstructure for W1.8507
Authors: Nejneru Carmen , Axinte Mihai , Perju Manuela Cristina
Published: August 2013

Usually, finite elements analysis software is used for the analysis of large structures in relation to the size of metal microstructure. These programs use a homogeneous material micro model, and do not take into account the fact that the metal is composed of grains with different properties [1,. Therefore, microstructural changes occurring in different applications cannot be identified, otherwise than using a specialized program with object-oriented analysis technique that is a true picture of microstructure [3, . In the last two years a specific interest for this area is recognized, so it is mandatory to keep
Study of the Uncut Chip in 5 Axes Ball Nose End Milling for the Third Quadrant of the Tool Inclination
Authors: Cosma Marius
Published: August 2013

The cross section variation of the uncut chip produced by a ball nose cutter is very complicated. In this sense, the current paper looks into and assesses some aspects regarding the geometric simulation of the chip generating mechanism in 5 axes ball nose end milling. The influence of tool inclination, however, was not considered in the machining strategy, starting with the tool path program in CAM software which allows the management of various ways of tool path generation, but cannot decide which one is the best. The present study advances, with minimal approximation, a geometrical method to establish the volume of the uncut chip and area variation of the cross section, obtained in 3D-CAD by four surfaces intersection. Both rotations in 5 axes are considered for the tool, in negative sense (A- & B-) for 0 to 30 degree range (third geometrical quadrant).
Simulation Determination of the Electromagnetic Parameters for the CdCr2S4 Multiferroic Relaxor in GHz Range
Authors: Ionescu Daniela , Kovaci Maria
Published: August 2013

The GHz range is a domain not enough exploited for application in the case of the materials like the CdCr2S4 multiferroic which possesses all four properties of colossal magnetoresistance, electroresistance, is colossal magnetocapacitive and electrocapacitive. The 3D simulation by structural description of such a material represents a real challenge of the descriptive simulational science, due to the complexity of the internal phenomena and interactions which occur here. Dielectric and magnetic properties were reported up to 3 GHz by measurements (Hemberger et al. and so on), while our simulation method is coming to extrapolate the results up to 18 GHz for applications in spintronics and microelectronics. The geometrically frustrated thiospinel system, included in the Heisenberg 3D ferromagnets class, was described with help of the HFSS 13.0 program. An algorithm based on physical consideration was used for the material samples simulated inside a rectangular waveguide, in order to determine their complex electromagnetic parameters (electric permittivity and magnetic permeability). Maxima were found on the real permittivity / permeability graph and by overlapping of the graphs, distinctive resonances were separated. Resonances were linked on the internal structure and the exciting field interaction with the material samples, considering that each mechanism of interaction is dominated by the characteristics of the ferroic propriety involved. A structural resonance map for the microwave range up to 18 GHz was represented. The material presenting all four ferroic properties has resonances specific for each property, but also cumulative resonances, of various magnitude, which can be described only by considering two or more ferroic properties characterizing the same material state.
The Influence of Kinematic Joints Clearances on the Positioning Accuracy of 3DOF Delta Parallel Robots
Authors: Andrioaia Dragoș , Stan Gheorghe , Funaru Marian , Obreja Claudiu
Published: August 2013

During the latest years the robots with Delta 3DOF parallel structure began to be used more and more in high accuracy applications, due to their advantages: high stiffness, availability for usage at high rates of speed and acceleration [1, . Obviously, for the high accuracy applications the elaboration of new analysis methods of the positioning accuracy is imposed. Further to the deviations of the element dimensions in the structure of the kinematical couplings or wear, perturbing influences may occur on the positioning accuracy. This work approaches the influence of the maximum clearance in the kinematical couplings on the positioning accuracy and its repartition on the work space of the robots with Delta 3DOF parallel structure, by using a method that has numerical solution.
Performance Analysis of a Layout of an Assembly Line Supplied Based on Stock or Synchronous
Authors: Nitu Eduard Laurentiu , Rotaru Ana , Gavriluţă Alin Constantin
Published: August 2013

The present paper is part of a broader study of the authors, consisting in the design of production systems layouts. In this paper is studied the influence of the supply method of an assembly line with mostly manual activities, in two hypotheses: mono-product and multi-product, supplied based on stock or synchronous, on its performances. The considered performance indicators are: the space needed for plant layout, the flexibility of the operator and an ergonomic indicator. These had been determined analytically or by 3D modeling of the assembly line. The obtained results show that, although the overall space of the system increases on the synchronous supply, the indicators for flexibility and ergonomics are significantly superior comparing to the ones from the supply based on stock.
Advanced Integrated Design Method for Fatigue Assessment of Large Elastic Ship Structures
Authors: Rubanenco Ionica , Mirciu Iulia , Domnisoru Leonard
Published: August 2013

This paper is focused on an advanced method for ship structures fatigue assessment. The ships classification societies standard rules for fatigue analysis are based on simplified procedures, with wave induced loads obtained by linear oscillation analysis (low frequency, around 0.1 Hz), or equivalent statistical wave loads. In the case of large elastic ship structures, with hull length over 150 m, the global wave induced vibration response (high frequency, around 1 Hz) becomes significant. The developed integrated method for large ships fatigue assessment includes three interlinked analyses, as follows: the hot-spot stresses evaluation by 3D finite element models, wave induced loads by short term linear and non-linear hydroelastic dynamic analysis, ship service life and fatigue assessment by damage cumulative ratio method. As testing ship, it is considered a double hull LPG Liquefied Petroleum Gas carrier, with total length 239 m, for a set of structural details with stress hot-spots. Based on the non-linear hydroelastic wave loads, the integrated method of fatigue assessment becomes more accurate, predicting for the amidships structure 14 years of ship service life, instead of over 20 years according to the rules standard approach, so that the confidence on ship structure fatigue evaluation can be increased in the design process.