bluuebunny/crossref_metadata_2025 huggingface dataset:
Leaching of Low-Grade Manganese Ores by Using Two Compound Reductants
Authors: Liu Wei , Song Chuang Chen , Wang Xin Zhi , Song Jian Guo
Published: May 2013

Under acid leaching conditions, studies was discussed that the impacts of reductant type and amount on leaching rate of manganese by using three groups of glucose - hydrogen peroxide, cellulose - hydrogen peroxide and glucose - cellulose as composite reductants. The results indicate that compound reductant is able to improve the leaching rate of manganese easily. With the optimal reductant group, leaching rate of manganese can be more than 97%.
Corrosion Effect of Acid Rain on the Technical Properties of Mineral Aggregates
Authors: Feng Xin Jun , Xiong Xu
Published: May 2013

Through a large number of laboratory tests, authors study corrosion effect of acid rain on the technical properties of mineral aggregate, such as apparent relative density, bulk relative density, crushing value and Los Angeles abrasion value. According to the tests results, the degree of acid corrosion of mineral aggregates constantly increases with the decreasing of the PH value and the increase of dry-wet cycle number. The acid corrosion resistance ability of mineral aggregates is the best for the granite, medium for basalt and the worst for limestone.
The Analysis and Correction of Sampling Bias of Discontinuity Orientation Caused by Linear Sampling Technique
Authors: Wang Yi Wei , Luo Zou Quan , Zuo Hong Yan
Published: May 2013

Orientation data of discontinuities are of paramount importance for rock engineering studies because they affect the rock slope stability and control the path of flow. Most orientation data are collected using linear sampling. However, data acquired by such linear sampling techniques are subject to bias, owing to the orientation of the sampling line. Even if a weighting factor is applied to orientation data to reduce this problem, the bias is not be significantly reduced when certain sampling orientations are involved. If the linear sampling orientation nearly parallels the discontinuity orientation, most of these parallel discontinuities are excluded from the survey results. To correct this bias ,a weighting factor is applied to orientation data first of all and then the orientation data in blindzone is corrected by added date from the different sampling line .The comprehensive pole and contour plots diagram is completed at last, which is consistent of the real situation. This method makes up for the deficiency of linear sampling technique and obtains the comprehensive orientation data in rock.
Vulcanization Kinetics of Starch Xanthate /Natural Rubber Composite
Authors: Luo Wen Jie , Li Si Dong , Wang Zhi Fen , Fang Lin , Lin Hua , Zhao Tong Jian
Published: May 2013

The starch xanthate/natural rubber (SX/NR) composite was prepared by directly mixing and co-coagulating NR latex and the modified starch paste with carbon bisulfide. The vulcanization kinetics of NR and SX/NR composite were investigated by using a rubber process analysis (RPA). The mechanism of SX/NR composite vulcanization was similar to that of pure NR. The values t0and tdisof XS/NR composite were shorter than that of NR, and the activation energy E1for the induction period was smaller. The activation energies E2and E3for the curing period were smaller than that of NR.
Application of Diffraction and X-Ray Microanalysis in Study of MMC Structure
Authors: Gawdzińska Katarzyna
Published: May 2013

Quality of metal-matrix composite castings, similarly as quality of conventional metal castings is defined by the collection of data concerning chemical constitution, properties (e.g. strength) and structure of final products. During study aimed at determining these parameters, the priority is to maintain the highest possible repeatability and automation of measurement. In case of chemical constitution or mechanical properties analysis it is considerably easy to achieve thanks to application of appropriate research procedure. Analysis of structure of studied materials is however a much bigger problem. To improve it, different tools of digital image analysis are being used, but because of only slight differences (e.g. in color) between different elements of structure, conducting such analysis without performing additional study may result in obtaining false results. In such case, identification of an object is very important: unequivocal conclusion whether a given object is a reinforcement or maybe an impurity or an inclusion foreign matter, or is it a structure of improper, unintentional chemical constitution. It is particularly important concerning composites for which on the images obtained using both optical and scanning microscopy individual phases (reinforcement, matrix and impurities) are difficult to distinguish. In such case identification of particular phases is aimed at avoiding mistakes, for example while analyzing the quantity or uniformity of spacing of reinforcement phase in given space. X-ray diffraction may be a solution for this problem. An example of identification (quantitative and qualitative description) of reinforcement phase in suspension composites is presented further in the paper. The authors present also a chemical constitution of selected elements of structure of metal-matrix composites from ex-situ group.
Parameters Optimization of Steel Wire Reinforced Thermoplastics Composite Pipe
Authors: Shang Peng , Qu Yun Xia , Zhao Jing Jing
Published: May 2013

Recently the steel wire reinforced thermoplastics composite pipelines are increasingly used in many different fields. In this paper, a parametric finite element model (FEM) of Steel Wire Reinforced Thermoplastics Composite Pipe (SRTP) was established by using ANSYS parametric design language (APDL). The purpose of optimization was to reduce the cost, so the minimum of pipelines total weight was chosen as the optimization objective. The wall thickness of SRTP and the diameter and axial pitch of braided steel wire were chosen as the main optimize parameters. The whole optimization process must ensure that the bearing capacity of SRTP was not weakened, so the yield strength was chosen as the optimization constraints. The optimization results were reasonable and correct.
Silty Clay and Fibre Interaction
Authors: Chegenizadeh Amin , Nikraz Hamid
Published: May 2013

Reinforced soil has been among the most effective soil modification materials. Its use has been expanded rapidly into civil engineering, geotechnical engineering and pavement engineering. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fiber inclusion on the strength of subgrade material. Plastic fiber was used for this investigation. Fiber contents and aspect ratio have been changed during these tests. The fiber percentage varied from 0 % (for unreinforced samples) to 4%. Silty clay was used as sub grade material. Unconfined compression tests were carried out to investigate behaviour of the composite under different condition. The fiber length and fiber content found to play important rule on the strength of composite. Furthermore it was observed that ductility of sample increased by fiber inclusion.
Fabrication and Characterization of NiOx/Bi2WO6 with Enhanced Photocatalytic Activity under Visible Light Illumination
Authors: Ma Chun
Published: May 2013

The NiOx/Bi2WO6 photocatalyst with p-n heterojunction structure was synthesized. And the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). It was found that the RhB degradation rate with NiOx/Bi2WO6 was 1.62 times as great as that with the Bi2WO6 under visible light (λ>400 nm) by the photocatalytic measurements. The enhanced photocatalytic performance of the NiOx/Bi2WO6 sample was attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the p-n heterojunction between Bi2WO6 and NiOx.
Study of Microstructure and Properties of Corundum-Calcium Hexaluminate Composite Aggregate
Authors: Fu Lv Ping , Gu Hua Zhi , Du Bo , Huang Ao , Li Zheng Kun
Published: May 2013

Effect of adding CaCO3 on the microstructure and properties of corundum was studied, with corundum modified by adding CaCO3 powder, by means of XRD, SEM etc. The experimental results show that when the quantity of CaCO3 powder is not more than 14.1wt%, would obtain corundum-calcium hexaluminate composite aggregate. When a little hexaluminate is generated, it would not increase porosity significantly but closed porosity increase slightly, and the heat conductivity is lower than tabular corundum. Calcium hexaluminate in aggregate grow well and are flakes. There are large numbers of small pores, and distributed uniformly. Composite aggregate has preferable performance of sintered and low thermal conductivity when hexaluminate generative capacity is about 27%.
A Molecule Computing Model for Maximum Independent Set Problem Based on DNA/AuNP Conjugation
Authors: Yang Jing , Zhang Cheng , Wang Hao
Published: May 2013

With the progress of DNA computing and nanotechnology, DNA/AuNP conjugation becomes an emerging interdisciplinary field. In this paper, a novel DNA computing model based on DNA/AuNP conjugation is developed to solve a maximum independent set problem (MIS). Making use of the hybridization between long DNA strands and short strands conjugated with gold nanoparticles, a series of searching process is implemented. After that, based on the number of DNA/AuNP conjugation on one DNA strand, the answer of the MIS is obtained. To verify the proposed algorithm, a simple paradigm is calculated by using the DNA computing model. In this model, there are some significant advantages such as easy detecting, and controllable automation. This work may demonstrate that DNA computing has the great potentiality in huge parallelism computation.
The Effect of PEG on the Preparation of Hydroxyapatite
Authors: Sun Qing Zhu , Wang Hai Bo
Published: May 2013

The hydroxyapatite (HA) colloids were prepared with precipitator method and characterized by means of TEM and XRD .The effect of surfactant on particle nanoHA was investigated. The results show that after modified by Polyethylene glycol (PEG), the best sample was prepared by adding 3.5% PEG solution and the HA-PEG molar ratio was 3:1. the size was about 50nm long and 20nm wide.
The Effects of Surfactants on the Topography of HA
Authors: Sun Qing Zhu , Wang Hai Bo
Published: May 2013

Nano-hydroxyapatite colloid was prepared by the method of precipitation. when the colloid was dried and sintered,it always agglomerated.The CTAB and SDS were added to disperse it . The effects of surfactants on the size and phase of HA crystals were studied by TEM and XRD .The results showed that Nanometer columnar HA powders of 40nm long and 20nm wide with narrow distribution of particle size and dispersion performance can be prepared when we added CTAB aqueous solution into HA colloid,CTAB concentration is 0.3%, mol ratio between CTAB and HA is 3:10. As SDS aqueous solution was added into HA colloid, the best process is that SDS concentration is 0.6%, mol ratio between SDS and HA is 1:1. The prepared powder with wide distribution of particle size is 30-60nm long and 10-30nm wide.
Study on Sintering Properties of Al2O3-70 Natural Mullite by New Processes
Authors: Liu Shu Long , Li Yong , Yang Huan Ying , Gao Chang He , Ma Shu Long , Wang Lin Jun
Published: May 2013

This paper explains sintering properties of Al2O3-70(referred to as the 70 green sample) natural mullite that was prepared by the process of homogenization, wet grinding, vacuum extrusion and high-temperature tunnel kiln sintering. The results show that 70 green sample's dehydroxylation temperature started in 528 °C; 70 green sample's sintering densification started in 1500 °C; 70 green sample had not completed sintering in the 1600 °C, and at this temperature, to prolong the holding time also won't realize densification. After sintering at 1600 °C, the sample's bulk density is 2.82. In this sample, the mullite phase was uniform distribution, density, low porosity and most are closed porosity.
Micro-Structure of a Special Sericite-Jade: A Preliminary Study Using XRD and SEM Analysis
Authors: Fu Wei , Yang Meng Li , Guo Qing Hong , Huang Xiao Rong , Chai Ming Chun , Guo Wei
Published: May 2013

A preliminary study on the micro-structure of a special sericite-jade material has been carried out by using the XRD and SEM methods. By XRD analysis, the 2M1 type sericite is identified as the main mineral composition of the white-colored, yellow-colored and green-colored jade. Quartz, as the secondary mineral, is also common in the green-colored jade. However, the dominant mineral composition of the black-colored jade is chlorite. SEM analysis reveals both the micro-morphology of the jade-forming minerals and the micro-structure of the mineral aggregates are various, which have significant relationships with the Guangning jade quality. Minuscular mineral grains and compact micro-structure make jade materials exquisite. Conversely, large mineral grains and the loose micro-structure make jade materials more rougher.
Effect of Type and Amount of Wetting Agent on the Formability and Bending Strength of Vitrified Bond Diamond Abrasives
Authors: Cheng Wen Sheng , Liu Yi Bo , Liu Wei , Yang De Tao , Jiang Zhi Jun
Published: May 2013

Wetting agent plays one of the most important roles in matrix designing of vitrified bond tools. In this paper, we studied the impact of wetting agents, resin liquid, sodium silicate and dextrin liquid, in different types and amount on the formability and bending strength of abrasive tools. It shows that tools using resin liquid as moistening agent by adding 4wt%～5wt% of the amount of bond and diamond to forming materials has the best performance in formability and bending strength of green and finished abrasive segment.
Study on the ZK60A and AZ31B Magnesium-Alloy in the Application on High-Speed Train Seats
Authors: Song Lei , Zhao Yan Hui , Liu Jia Zhen , Mu Jin Hui , Guo Xian Cai
Published: May 2013

The application of Magnesium alloy as a lightweight material in high-speed trains can realize an effect of largely reducing the weight of the trains. However, magnesium alloy extrusion profiles are rarely applied in the high-speed trains. A7003-T5 and 5052 aluminum alloys are used as the high-speed train seat-back’s material on high-speed trains recently. The experimental data indicates that the strength of the AZ31B magnesium alloy is 1.3 times of that of 5052 aluminum alloy and the strength of the ZK60A magnesium alloy is 1.21 times of that of A7003-T5 aluminum alloy.The FE analysis results indicate that if the ZK60A and AZ31B magnesium alloy is used as the material of the high-speed seat back instead of the A7003-T5 and 5052 aluminum alloy, it will have a weight loss of the backrest for approximately 33%. In addition, the application of ZK60A and AZ31B magnesium alloy has more advantages in energy-saving, environmental protection and safety control.
The Progress of Amorphous Si-B-C-N Composite Ceramics
Authors: Yang Fei Yi , Zhang Ning , Sun Miao , Fu Ting Ting , Kan Hong Min , Wang Xiao Yang
Published: May 2013

This article reviews the synthesis of Si-B-C-N ceramics, and the characteristics and principle of fabricating Si-B-C-N ceramics by using different precursors. So far, there only have two reports on preparation of Si-B-C-N ceramics, which are precursor pyrolysis and mechanical alloying. Therefore, this paper mainly discusses precursor pyrolysis and mechanical alloying. In addition, this paper proposed some prospects on the development and applications of Si-B-C-N ceramics in material science.
First-Principles Investigations of Structural Stability of LuN
Authors: Yang Xiao Cui , Zhang En Jie , Ma Hong Yuan , Xiao Jun Ping
Published: May 2013

An investigation on structural stability of LuN under high pressure has been conducted using first-principles calculations. At elevated pressures LuN is predicted to undergo a phase transition from NaCl-type structure (B1) into CsCl-type structure (B2). The predicted transition pressure is 220 GPa. The phonon dispersion curves of B1 and B2 at 0 and 220 GPa are presented.
Inaln/GaN HEMT Small-Signal Parameter Extraction
Authors: Zhang Xiao Wei , Xu Peng , Jia Ke Jin , Feng Zhi Hong , Zhao Zheng Ping
Published: May 2013

We use S-Parameter Methodto extract device parameter of InAlN/GaN HEMT in this paper. We find thatparasitic capacitance and parasitic inductance can be extracted in traditionaltest structure method, but do nothing about parasitic resistor. Cold parameter methodcan extract parasitic resistor efficiently, but there is greater error inparasitic capacitance and parasitic inductance extraction. We propose a methodwhich combines test structure method and cold parameter method to extract parasitic parameteraccurately. We can acquire intrinsic parameters through getting rid ofparasitism parameters, and can fitting test outcome satisfactorily. It canreflect accurately the physical characteristics of GaN HEMT devices, and givesfeedback and guidance to device technology at the same time.
Yield of Alloying Elements Fed by Cored Wire into A Copper Melt
Authors: Kang Bok Hyun , Lee Woo Hyun , Cho Ju Young , Lee Min Jae , Kim Ki Young
Published: May 2013

Alloying elements such as Fe, Zr and Mg in Cu were added by direct addition of powders and by feeding of cored alloy wire filled with alloying element powder in a lab scale furnace. The yield of Fe was the highest for both addition methods. Cored wire feeding was significantly more effective than the direct powder addition into the copper melt. Though the yield of Mg was almost zero by the addition of Mg powder, it was increased remarkably by the Mg cored wire feeding. Through the calculation of the model which was designed based on an industrial scale line, it was confirmed that the yield of the alloying elements was affected by the wire feed rate and the thickness of the copper tube that envelops an alloy powder.
The Influence of B2O3 on the Luminescence Behavior of ZnGa2O4 Phosphor at Different Sinter Temperatures
Authors: Zhong Rui Xia , Liu Zi Ran , Qi Jian Quan
Published: May 2013

ZnGa2O4phosphors have been synthesized by solid state reaction at different temperatures with different B2O3concentration incorporated in the experiments. All samples present green (509 nm) and red (696 nm) emission bands under ultraviolet excitation (250 nm), whose intensity changes because of the increasing B2O3contents. The green and the red long afterglow have been observed after removing the ultraviolet light and the performance largely improves with the introduction of B2O3. The effects of the doping contents of B2O3as well as the sintering temperatures on the luminescent properties of the obtained products have been investigated. The introduction of B2O3changes the ratio of the two emitting centers and increases the depth of the trap centers in the samples.
The Influences of Zirconia on the Properties of Magnesia Alumina Spinel Bricks
Authors: Hong Shan Shan , Li Yong
Published: May 2013

Using alumina-rich MgAl2O4 spinel AR78 and 97 fused magnesite as raw materials, brine as the binder, magnesia alumina spinel bricks close to theoretical composition and spinel bricks with zirconia have been prepared. Then the influences of zirconia on the properties of MgAl2O4 spinel bricks are researched. The results show that: (1) After the addition of zirconia, the direct bonding structure formed between spinel and zirconia can strengthen matrix structure and promote sintering, so the structural properties, the alkali resistance performance and the creep property of MgAl2O4 spinel bricks are all improved. (2) The optimal addition of zirconia is 6%, with which the spinel bricks have well alkali resistance performance and creep property of which the final creep rate is -1.46% after creep experiment for 50h.
Ti2AlC/TiC Functionally Graded Material Fabricated by Reaction Sintering
Authors: Chen Yan Lin , Yan Ming , Lu Pei Jie , Li Zong Yu , Zeng Cheng Wen
Published: May 2013

Ti/Al/TiC mixed powders were used as the raw materials for the fabrication of functionally graded material (FGM) by hot pressing sintering. The sample was analyzed by SEM combined with Metallographic microscope and Energy Disperse Spectroscopy,The results show that each layer is composed of TiC and Ti2AlC, without containing other phases. The size of TiC grains are about 3-6 μm. With TiC content in the layers increasing, Ti2AlC grains gradually decrease. The lathy Ti2AlC grains of the FGM have a length of about 10 μm and a width of about 4 μm. The interface of each layer has a good combination with a certain thickness transition layer.Microhardness tester is used to analyse the hardness of material.The results show that the Vickers hardness of every layer increases with TiC content increasing. The thermal shock performance test found that material has good thermal shock performance.
Elementary Discussion on the Treatment of Old Road Problems in Upgrading and Reconstructing for the Road
Authors: Feng Hong Wei , Wu Yi Meng
Published: May 2013

This paper mainly focuses on the actual situation of reconstruction works on provincial highway 310, 311, 104 line from Yuanyang to Wuzhi sector (to be up State Road), and analyses the pavement disease and the cause of it in different sections, different pavements structure, different traffic environment, as well as proposes to take measures to prevent the pavement disease, combines with conservation work in highway construction and practice in this area.
Finite Element Analysis for Concrete Filled Double-Skin Steel Tubular Stub Columns
Authors: Wang Yan Ze , Li Bai Shou
Published: May 2013

To realize axial load behavior of CFDST, ANSYS is used to analyze the process from load to destruction that hollow section ratio is the main variable parameter. To explore the validity of finite element analysis software, axial compressive strength is calculated combined with formulas of existing criterions. The results show the finite element results have a good agreement with text values and calculation.
Effects of Cr Substitution of Mo on the Formation and Mechanical Properties of FeCoMoCrZr Amorphous Alloys
Authors: Xie Chun Xiao , Yang Yuan Zheng , Chen Mu Zhu
Published: May 2013

The melt-spun method, X-ray diffractometer (XRD), differential scanning calorimeter (DSC),vickers microhardness measurement and bend test were adopted to study the effects of Cr substitution of Mo on the glass forming ability (GFA), thermal stabilities and mechanical properties of (Fe0.58Co0.42)73Mo17-xCrxZr10(x=0,3,6,9,12,17at%) ribbons. The results show that when x ranges from 9~17, the ribbons are in an amorphous state. With increasing the Cr content, all the characteristic temperatures including TgTxTp move towards to the lower temperature regions, but the supercooled regionsΔTx increases, the GFA of sample is rising. In the bend test, all the amorphous ribbons can be classified asductile.
Research on Mass Concrete Construction Techonogy of Raft Foundation of Hongyun Building
Authors: Yin Su Hua , Huang Yuan , Yuan Ying Hui
Published: May 2013

The foundation of A tower of Hongyun building is made of raft board foundation which is 4200mm in the thickness and 3500mm beside side of the core tube. It is researched that the raft foundation mass concrete construction technology is expatiated from temperature and cracks of the raft foundation and the temperature control and monitoring of the concrete base slab construction and concrete curing.
Study on Medium Density Radial Bamboo Curtain Composite Plybamboo
Authors: Du Chun Gui , Jin Chun De
Published: May 2013

Previous studies have indicated that the density and the cost are high,and construction are difficult for radial curtain composite plybamboo.This paper presents a study on the high pressure and low pressure manufacturing technology of medium density radial curtain composite plybamboo.The results showed: the high pressure technology was optimum manufacturing technology of medium density radial curtain composite plybamboo,and the technology conditions were: hot pressing temperature was 140 °C, high pressure maintaning time was 80s/mm at 4MPa, high pressure maintaning time was 100s/mm at 3.5MPa.
The Guidance Pattern of Countryside Sustainable Development of Three Gorges Reservoir in Chongqing
Authors: Zhou Ji Xia , Peng Li
Published: May 2013

This article embarks from the nature and social economy conditions of the Three Gorges Reservoir in Chongqing. It has analyzed the question which the Three Gorges Reservoir’s countries meet about sustainable development and initially proposed the guidance pattern of countryside sustainable development, Agricultural industry, ecological agriculture, characteristic agriculture and village traveling. According this, it provides the countermeasure and suggestion .So it provides the reference for the economy development of the Three Gorges Reservoir’s countries and the new rural reconstruction.
The Influence on the Concrete Durability in Bleed Air Performance Caused by Concrete Admixture
Authors: Zheng Yu Xian , Zhu Xun Guo
Published: May 2013

The article issued the influence on concrete durability caused by concrete admixture, based on the further study on concrete admixture bleed air performance test, and researched the influence on concrete durability caused by it. The experiments show that the admixtures of air-entraining performance improve internal pore structure of concrete and increase the compacting condition concrete. Concrete admixture also can improve the impermeability of concrete frost resistance and improve the resistance to environmental actions, and proposed concrete air content of the Dalian region suitable value.
A Review of Detection, Evaluation and Repair Technology for Hydraulic Concrete Structures
Authors: Xiao Li Ying
Published: May 2013

This paper provides a review of the progress in America, Europe, Japan and china withnumerous standardizations and investigations for the protection and repair of hydraulic concrete structures.These researches include detection technologies, evaluation methods, applications of newconcrete reinforcing and repair materials. This paper identifies the significant progress made by theInternational Commission on Large Dams(ICOLD).At the same time, some specific investigations are carried out on the ageing of hydraulic concrete structures in china. On this basis, the detection, assessment and remediation analysis of hydraulic concrete structures are summed up, and someadvice is put forward to the next stage of work.
Electrochemical Behaviors of Die-Cast Mg-4Al-0.4Mn-Xpr (x=0, 1, 4) Alloys in NaCl Solution
Authors: Niu Xiao Dong , Sun Wei , Qiu Xin , Meng Jian , An Jian
Published: May 2013

The microstructures and electrochemical corrosion behaviors of die-cast Mg-4Al-0.4Mn-xPr (x=0, 1, 4 wt.%) alloys have been investigated. Electrochemical behaviors of all alloys are described by open circuit potential test, potentiodynamic polarization test and electrochemical impedance spectroscope in 3.5 wt.% NaCl solution. The results show that the α-Mg grain is refined and the continuous net β phase appears gradually with increasing the content of Pr in the Mg-4Al-0.4Mn alloys. Moreover, the β phase plays a role of galvanic cathode in AM40 alloy and corrosion barrier in Pr-containing alloys, respectively. Electrochemical measurements show that Pr can improve corrosion resistance of Mg-4Al-0.4Mn alloy in the 3.5 wt.% NaCl solution, and corrosion rate decreases with increasing Pr content.
Analysis On Morphology Of Settlement and Residence In Wangyu Village
Authors: Su Jie , Wang Jin Ping
Published: May 2013

According to the legend，Lingshi county Wangyu village evolved continuously from Gu village, the station where Da yu once combated the flood. Even to this day, it also keeps the complete pattern and basic elements of Chinese ancient village. It has the high significance and value of the reasearch. Through the location characteristics and the historical background, discusses the main causes of the settlement landscape features, preliminary anlysis the structure layout, spatial organization and the morphological characteristics of the settlement landscape and residence, summarize the valued characteristic of the ancient village.
Concrete Slab Value Stream Mapping of Brazilian Residential Buildings - a Lean Construction Study Case
Authors: Fontanini Patricia Stella Pucharelli , Milano Caroline de Souza , Fujimoto Aparecido , Lintz Rosa Cristina Cecche , Gachet-Barbosa Luisa Andréia , Jacintho Ana Elisabete P.G. A. , Pimentel Lia Lorena
Published: May 2013

Sustainable research inconstruction environments has being weakening more interest for theconstruction sector, due to visible wastes during the constructive processes.In this scenario, high costs and consumptions of unnecessary materials in the work activities are inserted also, which generate waste and customer dissatisfaction.The real knowledge of this situation can be present with the Lean Thinking concepts application. The scientific initiation research identifies, from the Value Stream mapping application, the structural elements processes and all the waste detected in their observation. This study case shows how to apply the lean principles, and presents your informally application in the Brazilian Company specifically. This study has an investigative character, and considers that the company applies just a part of the Lean principles. Therefore, the paper has as objective to present the application of VSM and the preliminary sustainable analyses too.
Effect of Pore Structure on the Chloride Permeability of Concrete with Mineral Admixture
Authors: Hu Yan Jun , Du Yan Liang
Published: May 2013

In this paper, the effect of pore structure on the chloride ions ingress into concrete was investigated. The most probable diameter was measured by Mercury intrusion porosimetry (MIP) and the total porosity was measured by evaporative water method (EWM). The results indicate that the most probable diameter by MIP has better linear relationship with chloride diffusion coefficient than the total porosity by EWM, the most probable diameter has significant influence on chloride diffusivity, and the smaller most probable diameter will lead to higher chloride penetration resistance.
Evolution and Significance of the Residential Area of Landscape Design
Authors: Guo Hong Yu , Cai Yun Nan
Published: May 2013

This paper explores the significance of residential area landscape design from the angle of the residential area landscape evolution. Separately from the origin of the eastern and western landscape design, it expounds the meaning of the residential landscape on landscape origin. From the point of view that the residential landscape is the turning and expand fulcrum of modern landscape, it discusses the change process of landscape concept. As the residential landscape has become an independent direction, it explains the future trend of modern landscape design.
From the View of Qujia Courtyard House of Shan Xi Dwellings Traditional Cultural Value
Authors: Du Rong , Wang Jin Ping
Published: May 2013

Traditional houses spirit and culture should be inheritance and development, also should give traditional houses with angry, the rich vitality, to make it a really safe, comfortable, adapt to the environment and convenient use of all kinds of building space environment. Based on the Qujia courtyard, for example, from the plane layout, environment characteristics, the space structure, decoration and the damaged and protection of Shan Xi， residence this traditional cultural value.
Protection and Sustainable Development of Jiexiu Ancient City
Authors: Xu Yun , Wang Jin Ping
Published: May 2013

The Ancient City Jiexiu, an important specimen of the county system of ancient China, carries information of thousands of years of history. It is of high historical and cultural value. In order to analyze the ways of the protection and sustainable development of Jiexiu, the author did field researches from the cut point of the history and value of the ancient city and proposed a proper way to protect and reuse of the Ancient City Jiexiu, hoping to provide some ideas of protecting the historical and cultural city.
Research on Axial Behavior of Thin-Walled T-Shaped Steel Stub Columns Filled with Recycled Demolished Concrete Lump
Authors: Jin Ai Hua , Li Bai Shou
Published: May 2013

An axial compression test has been done on 12 short columns, ribbed and spiral stirrup short column filled with recycled demolished concrete lump to study the axial compression variable characteristics and ultimate bearing capacity of thin-wall T-shaped steel tube column filled with recycled demolished concrete lump. The load displacement curve has been analyzed, ultimate bearing capacity of standard formula has been compared and the reliability of finite element numerical simulation and been discussed. The result shown that the form of steel tube embedded with structural members has more effectively increased the tensility, delayed bending occurrence, enhanced the effect of restraint of core concrete and increased the ultimate bearing capacity than that the form of plain section form. The ultimate bearing capacity of ribbed form has been increased by 16.76% than non-ribbed form，and the ultimate bearing capacity of spiral stirrup form has been increased by 11.98 % than non-spiral stirrup form. The finite element simulation and the test result was identical properly.
Soil Erosion Assessment in the Watershed of Dehua District of Fujian Province
Authors: Zhang Yue , Song Bo , Wang Jin , Sun Hui
Published: May 2013

Based on different land use types and diverse watersheds of Dehua district of Fujian Province, soil erosion is assessed by using Universal Soil Loss Equation (USLE). According to the results, erosion of Dehua is generally mild, among which total erosion is 952.71×103 t/a and erosion area is 2210.67 km2. It is significant that the vast forest and grassland contribute to avoiding erosion effectively. In addition, the overlap area of Min and Jin River and Chanxi of Min River, the most frequent place of human activities, are the two highest soil erosion watersheds. The result shows that human activities have great influence on soil erosion. This article intends to provide evidence for planning and control measures of soil erosion.
Study on Recognized Mode of the Revolutionary Site Protected Object in Traditional Village
Authors: He Ning Ning , Zhu Xiang Dong , Wang Chong En
Published: May 2013

This article takes the Eighth Route Army Command Zhuanbi Former Site in Wuxiang county, Shanxi province for example. Through the investigation and analysis of the eighth route army general command organization, summarizes all the historical heritage that scattered in the villages, draws a recognized mode of the protected object which is more real and complete to protect the eighth route army general command site. This provides reference and basis for the protection work of the other similar revolutionary historical buildings and the same type of protection in the future.
The Cause of Cracks in the Cement Concrete Pavement of County-Highway and Precautionary Measures
Authors: Guo Zhi Dong , Yi Li Jing , Liu Jing Yi , Xu Dong Qiang
Published: May 2013

This article has analyzed the main cause of cracks in the cement concrete pavement of county-highway and proposed some precautionary measures and disposition measures.The measures of cracks in cement concrete pavement mainly have pressure injection and grouting,expansion seam grouting,directly grouting,striped overlay and nozzle grouting.
Study on the Natural Vibration Characteristics of Jointed Slope
Authors: Wang Miao , Li Hai Bo , Liu Ya Qun , Huang Xiao Cheng
Published: May 2013

Analysis of the vibration characteristics of slope is the basis of dynamic analysis of slope; therefore, it has an important engineering significance. In this paper, ideal joint rock slope was studied by the modal analysis and harmonic response analysis module in the ANSYS software, meanwhile, the section of the model size and the effects of the structural parameters on the vibration characteristics of slope were also discussed. The results show that the stiffness of the structural surface is the key factors that affect the vibration characteristics of slope, and with the stiffness of structural surface increases, the first modal shape of slope was changed from dislocation vibration that along the structural surface to horizontal vibration. Only the first natural frequency can be excited the "resonance" phenomenon in the horizontal direction under the seismic load. Therefore, the joint slope is more easily to be excited "resonance" under earthquake load because of the first natural frequency of joint slope is smaller than homogeneous slope; moreover, this is consistent to the investigation results of Wenchuan Earthquake.
Analysis of the Effect of Natural Slope Stability due to Tunnel Excavation in Mountainous Areas
Authors: Liang Xu Li , Wang Fei , Hao Gang Li
Published: May 2013

The effect of natural slope stability due to the tunnel excavation in mountainous areas is studied used influence function method, and one tunnel excavation project in Hebei province was analyzed, the theoretical results obtained are in good agreement with the real monitoring data, therefore, the influence function method can be effectively used to predict the ground displacement caused by tunnel excavation in mountainous area, which could provide the basis for the evaluation of the safety of such works.
Atmospheric Corrosion Behavior of Salvaged Marine Cast Iron Artifacts
Authors: Ouyang Wei Zhen
Published: May 2013

The atmospheric corrosion behavior of cast iron after six months immersion was studies by means of optical stereomicroscope and X-ray diffraction techniques. The results showed that active corrosion occurred on the rusted specimen covered with many thin spherical shells of solid material. The XRD analysis indicated the formation of β-FeOOH tends to increase with increasing exposure.
Effects of Laccase on the Properties of Hemp Fabric
Authors: Zhang Xiao Li , He Yin Di
Published: May 2013

Laccase was selected totreat linen fabric. Such properties of linenfabric were analyzed as weight loss rate, whiteness, breakagestrength, capillary effect, flexural stiffness. The orthogonal test was designedabout pH value, temperature, time and concentration. The factorswere discussed on hemp fabric performance. The optimal process of laccase treatment on hemp fabricis: 50°C, pH4, 25ml/300ml, 50min. Underthe best conditions, hemp fabric weight lossrate 1.87%, breakingstrength 674.7N, whiteness 60.7,flexural stiffness 703.7, capillary effect 8.08cm,wrinkle recovery angle174 º. And the hempfiber’s microstructure changed.
Shock Reliability of Comb Accelerometer
Authors: Jia Yu Bin , Wang Shi Tao , Huang Qin Wen , Hao Yi Long
Published: May 2013

Comb accelerometer structure includes mobile fingers connected with proof mass and fixed fingers linked with anchor. Under a huge shock, the reliability analysis of the accelerometer is reduced to the one of simple beam due to the stopper, i.e. shock response of double-clamped beam and single-clamped cantilever. From the quantitative analysis and numerical simulation in this paper, some useful conclusions are obtained: first damage or fracture for comb accelerometer is the finger beam rather than the bearing beam.
The Application of Wireless Sensor Network in Coal Mine Monitoring
Authors: Zhu Ying Li , Xie Ling Qing
Published: May 2013

The safe of the cola mine has become the focus of the national industrial security, the prevention and monitoring of coal mine safety have been researched in recent years. With the development of sensor technology, MEMS, wireless communications, Wireless Sensor Networks have been paid great attention in industry field and our daily life. According to the grim situation of current production safety, the article applies WSN (Wireless Sensor Network) to safety monitoring system of the coal mine. For the purpose of meeting requirements of monitoring signals, JN5139 is chosen as the microprocessor. The sensor nodes can collect and transport the environment parameters of the coal mine including temperature, humidity and gas concentrate and so on, and send the data to the remote monitoring center. The monitoring system can improve the level of monitoring production safety and reduce accident in the coal mine.
The Key Technology of Seeking North's by GAT Magle Gyro Stationits and Application in Underground Engineering
Authors: Shi Zhen , Yang Zhi Qiang
Published: May 2013

To the certain deficiencies in the practical application of traditional hang belt Gyro theodolite ,focused on describe the key technologies, technical features and system advantages of the GAT precision magnetic levitation Gyro Station which research and development independently based on maglev bearing technology, and combined with the south water to north and pull the red economic stone those two underground hydraulic engineering application examples,illustrates the broad application prospects and high accuracy, high stability and operating convenience features and systems promoting advantages of the GAT maglev Gyro Station in underground engineering survey.
A Localization Method for WSN Based on Variable Transmission Power
Authors: Huang Guang Xiong , Shan Zhi Long
Published: May 2013

Localization is an essential technology in the application of wireless sensor network. As a range-free localization algorithm, DV-Hop works well in dense and isotropic networks, but not much in irregular and sparse topologies, especially in the big curvature of shortest path case. In this paper, location information beyond the communication range was obtained by means of variable transmission power of enhanced nodes. Besides, three schemes was proposed to meet the need of different scenarios. Moreover, the simulation results validate that our method can improve position accuracy about 20% and ameliorate the performance of DV-Hop in irregular scenario.
Ground Calibration System Design of High-Precision Star Sensor
Authors: Duan Jie , An Zhi Yong , Sun Xiang Yang
Published: May 2013

In order to meet the high precision calibration requirements of precision angular distance and high magnitude to the optical navigation sensor, A new style of high precision star simulator with large caliber, and long-focus, is presented. And then the main compositions of this simulator are designed in detail referring to the simulator, the steering mirror, the standard simulated targets and so on. According to the simulator characteristics of large size lens and multi lens, the structural of lens cone uses the tube sleeve and inner sleeves fixed together means. To eliminate the mirror deformation, the design plan based on the tiny stress is applied in steering mirror. In order to achieve a high magnitude, the light targets are simulated by optical transmission from OLED to high precision drone with fibers. Its degree ≤1〞,simulated magnitude≥5 that meet calibration requirements of the current high-precision optical navigation sensor.
The Course Angle Indicator Based on Magnetic Resistance Sensor
Authors: Sun Hua , Cheng Pei , Wang Ying , Li Hao Jun
Published: May 2013

A kind of digital compass based on magnetic resistance sensor was designed. The principle of the course angle measurement based on magnetic resistance sensor was analyzed, and it elaborates the scheme of course angle system design and implementation. FPGA was chosen as processor, and the embedded kernel was built up based on SOPC. The course angle measurement and digital display were realized. The error compensation was used in this system. The error analysis and contrast were given. This kind of course angle indicator is small volume and high precision. It can be applied to different carrier, and has high universality and practical value.
The Finite-Element Simulation of the Intra-Body Communication Used in Wireless Body Area Networks
Authors: Wu Jun Sheng , Zhang Kai , Zhang Shi Ying , Ma Rui
Published: May 2013

The finite-element simulation of the intra-body communication used in wireless body area networks has been introduced. Firstly, a novel finite-element method for modeling the whole human body is proposed, while a FE model of the whole human body used for IBC simulation was developed. Secondly, the simulations of the galvanic coupling IBC with the different signal transmission paths were implemented. Finally, the feasibility of the proposed method was verified by using the in vivo measurements. Our results indicate that the proposed method will offer the significant advantages in theoretical analysis and the application of the intra-body communication used in wireless body area networks.
Interrogation Signal Generation for SAW Temperature Sensor
Authors: Lee Theng Wei , Chung Wan Young
Published: May 2013

This paper presents the method to generate frequency modulated continuous wave (FMCW) interrogation signal by using a phase lock loop (PLL) transmitter and NI ELVIS development board. The FMCW interrogation signal can be used for measuring temperature from a surface acoustic wave (SAW) sensor. The development of the PLL transmitter is discussed. The Arbitrary Waveform Generator of NI ELVIS is utilized for generating a linear frequency sweep reference signal, which will be used as a stable input signal for the transmitter. A MATLAB simulation using a pulse compression technique is performed to investigate the relationship between the FMCW bandwidth and range resolution.
IP Core Based on the Kalman Filter Algorithm in the FPGA Implementation
Authors: Xue Zhao , Quan Liu , Wang Xiao Fei
Published: May 2013

This article discusses one-dimensional Kalman filter algorithm using FPGA hardware IP core implementation process. First of all, to program the FPGA matrix operations, implementation of double precision floating point. Then the Kalman filter algorithm programmed in MATLAB, to verify the correctness of the algorithm thinking. Finally the MATLAB language programming algorithm is converted into VHDL language. And call 64 a double precision floating point data algorithm realizes the design of 1-D Kalman filtration algorithm IP core, which make the Kalman filter meet the high precision as well as high speed to complete complex algorithm.
The Research of Piezoelectric Impedance Technology Applying to the Dynamic Signal Excitation Beam
Authors: Zhang Jun , Zhao Xian Wen , Tang Hong Mei , Li Xian Hua , Cai Qing Yang , Niu Meng Meng , Tang Chun Ren , Gao Qin
Published: May 2013

The technology of damage detection by the piezoelectric impedance has been researched extensively, and in which the static load is usually used. To further expand the research of range, the dynamic signal excitation beam is used. A piezoelectric coupling beam model was established to deduce formulas of beam admittance. The resonance frequency of piezoelectric coupling beam and the dynamic signal excitation beam were studied in experiment. In the low frequency non-resonant frequency region, the experiment results are consistent with the theory. Research shows resonant frequency of coupling beam is equal to its natural frequency.
Application of Monitoring the Melt Flow Balance of Injection Molding Process by Using Cavity Pressure Monitoring Technology
Authors: Chen Jin Wei , Peng Xiang Fang
Published: May 2013

At first this paper described the cavity pressure monitoring technology definition and work principle. Then showed that made use of monitoring the cavity pressure curve and study melt flow balance by specific example. The use of cavity pressure curve could be quickly and accurately get the best process parameters, so change the way of obtaining process parameters optimization from the "experience" basis to "scientific" basis. The article concluded it could understand deeply and grasp the relationship among the three proposals of the cavity pressure curve, process parameters and product quality.