bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Agricultural Ecology Video Monitoring Systems Based on the Internet of Things
Authors: He Ting Ting , Bai Hao Ran , Wang Lei , Jiang Qiu Peng
Published: June 2012

More attention has been paid to the long-distance video monitoring systems with the development of the Internet of things recently, especially much more increasing concern took place in application of agriculture monitoring systems. An agricultural ecology remote video monitoring system was designed and established using the environment of Microsoft Visual C++6.0 based on Windows XP operating system in this paper. Three key skills including the VFW video capture technology, H.264 video coding/encoding and multi-threading technology are utilized. The transmitting video; audio and text file in the remote video monitoring system are totally realized through VC++ software. The information can be gained; restored and queried through the Internet of things and the ecology garden may also be remote controlled at the same time.
Design of a Remote Wireless Surveillance System Based on 3G
Authors: Hu Bai Yan , Ke Zong Wu , Huang Lin , Wang Chong Wen
Published: June 2012

The remote wireless surveillance system based on 3G consist of the front-end image capture module, data transmission module, and the back-end monitoring part. The basis elements of the system and the principle is discussed .The system of software and the hardware is introduced. The system is high-compressed, of high quality ,easily wiring, and of high efficiency. The best use of the system is to surveillance the complicated enviroment of a large scale project.
A Simulation System of Anti-Ship Missile Path Planning Oriented Ship Formation
Authors: Liu Gang , Lao Song Yang , Hou Lv Lin , Yuan Can
Published: June 2012

According to analysis of relationship among fire distribution, area division and path planning, the thought of trinity tactical decision of surface ships formation missile path planning (SFMPP) is put forward. Expandable open simulation architecture is designed and established based on high level architecture HLA. In order to describe simulation requirement, the static structure model and dynamic behavior model were designed based on UML. Based on HLA/RTI specification, federation’s FOM/SOM is designed and developed. The implementation process of simulation system is expatiates, including simulation strategy, time management, modeling and the federates’ implementation process. The realization of SFMPP simulation system provides a reference trial platform for tactical application argumentation and armament development.
Design and Implementation of Embedded System Based on Modbus TCP/IP
Authors: Li Yan Xia , Zhang Mo Li , Niu Dan Mei , Zhang Xiao Ling
Published: June 2012

It is the requirements of limited resources and realtime in embedded system. Design of network communication system based on embedded system is hard. In this paper, we propose the architecture of embedded network using Modbus TCP/IP protocol, analyze the composition of Modbus TCP/IP protocol. It is that Modbus protocol information can be made in the TCP/IP protocol of the Internet transmission, and thus extend the application of Modbus protocol. The network communication system is designed and implemented on the ARM platform using non-blanking socket in Linux. The system is available, stable and worthy of popularization.
Design and Implement of Operation Simulation Scenario Generation Toolkit
Authors: Fan Yan Ping , Li Guang Hui , Bai Jie
Published: June 2012

Aiming at the generation of the scenario data in operation simulation, the comprehensive requirement building operation simulation scenario generation toolkit is analyzed in detail. Then the main functions and application flow are designed, and the correlativity between the toolkit and the other three subsystems are analyzed. Especially, in order to setup scenario database the entity-oriented simulation scenario structure description method is put forward. Finally, the main functions including scenario management, operation cooperation management, rule management, data validation &verification are achieved. The toolkit can satisfy the simulation scenario generation requirement of the operation simulation system, and can improve the efficiency greatly.
Research on Fingerprint Image Segmentation
Authors: Xue Jun Tao , Li Hong Wei
Published: June 2012

As part of fingerprint image pre-processing, fingerprint image segmentation plays an irreplaceable role. This paper proposes a method based on the orientation field information combined with statistical characteristics of gray in order to realize the second segmentation of fingerprint image. Various experimental results show that the method proposed in this paper improves the effect of segmentation.
Coexistence and Numerical Solutions of the Unstirred Chemostat Model
Authors: Feng Xiao Zhou , Wei Mei Hua , Li Chang Tong
Published: June 2012

This paper studies a competition model between two species for two resources in the chemostat with the Beddington-DeAngelis functional response. The sufficient condition to the coexistence of positive steady state solutions is obtained by the mathematical methods of the fixed point degree theory in cones. Finally, Some results of numerical simulations is presented to prove and complement the previous mathematical results by numerical computation method. Furthermore, the research result implies that two species in the biological environment can be coexistence after a long time.
The Modeling of Visual Perception for Virtual Soldier Based on Limited Rationality
Authors: Xue Qing , Xu Wen Chao , Mao Ying Xiao , Yu Ping Gang , Li Yong Hong
Published: June 2012

For the actual results of visual perception for virtual soldier, the model of visual perception for virtual soldier based on limited rationality is established. The paper analyses the conditions which affect the visual perception for virtual soldier including geometrical gene, visual gene, moving gene and contrastive gene. The visibility of virtual soldier is computed and the persuasion for visual perception of virtual soldier is received.
Fundamental Research of Sintering Process and Properties of Iron Base Composites
Authors: Yang Yu Fang , Liu Wen Bo , Mu Qiang
Published: June 2012

We have successfully synthesized iron base composites reinforced with SiC particles by a dynamic hot-pressing sintering process heating directly by electrical current. The corresponding equipment was improved and the best processing parameters was achieved after a systematically investigation. It was found that the novel sintering process, heating using continuous electrical current and then followed by dynamic temperature preservation using cyclic current, could effectively reduce the sintering time to 300 seconds and greatly improve the properties of the composites. The ultimate tensile strength of the as-prepared SiCp/Fe composite reaches 918Mpa, with a relative density of 99.8% and a hardness of 480HB.
L-R Logical Key Tree Management Scheme Applying Hierarchical Data Processing
Authors: Li Yan , Wang Zhi Peng , Xu Hao
Published: June 2012

This paper proves multicast management belongs to problems of HDP, provides the cost analytical model of multicast logical key tree which applies HDPT. Based on the above analysis, the author proposes an improved multicast logical key management scheme termed as L-R logical key tree management scheme. L-R logical key tree management scheme is a kind of imbalanced multicast logical key tree, which is based on periodic re-key, according member nodes’ joining and leaving different probability, it employs different multicast key management strategy. The paper provides the design and calculation of the scheme, and realizes it in a simulation. By comparing this scheme with the typical LKH one, it shows clearly the scheme proposed in the paper is of high effect and low cost.
Anomaly Detection for DDoS Attacks via Behavior Profiles Deviation Degree
Authors: Liu Yun , Yin Jian Ping , Cai Zhi Ping , Lin Jia Run
Published: June 2012

Distributed Denial-of-Service (DDoS) attacks present a very serious threat to the stability of the Internet. In this paper, an anomaly detection method for DDoS attacks via Behavior Profiles Deviation Degree (BPDD) is proposed. First, the behavior profiles of normal traffic and real-time traffic are constructed using Markov Chain respectively, and then BPDD is designed to measure the discrepancy of the two profiles. Furthermore, TCM-KNN (Transductive Confidence Machines for K-Nearest Neighbors) algorithm is applied to identify attacks by classifying the BPDD samples. The experimental results demonstrate that the proposed method can effectively distinguish normal traffic from DDoS attacks, and has higher detection ratio and lower false alarm ratio than traditional methods.
Application of Data Analysis of Public Transit Passenger Flow in Line Classification
Authors: Tong Ting Ting , Wang Jia
Published: June 2012

Applications of data analysis technology in analysis of public transit passenger flow and studying the classification of public transit lines using clustering analysis method are introduced in this paper. Public transit lines in Changsha, as a case, is studied, which if of references for optimizing the operation management of public transit.
Application of Virtual Reality Technology in Teaching of Architectural Design & Construction
Authors: Wang You Xi
Published: June 2012

During teaching of architectural design &construction, it is difficult for teacher shows building unit with 3-D characteristics in two-dimensional plane while students are little imagination. With the growth of virtual reality, the content of architectural design &construction become comprehensive and interactive which is understandable for students. The paper discusses the application of virtual reality in course and realizing method.
Research of Multi-Data Sources Report Model Based on Data Dictionary
Authors: Lu Yu Jing , Hu Qing Hui
Published: June 2012

This paper put forward an idea of multi-data sources report model based on data dictionary in order to separate the report from application program. When report changed, we can alter the system data dictionary, data source dictionary or modal file dictionary to adapt to new requests without any changes for application program. This brings to high independence between application program and report system. At the same time we can transplant the report system to different software system without any changes.
The Design of Storage Not Overflow Based on NAND Flash
Authors: Zhang Jing , Chu Yan , Li San Cai
Published: June 2012

To remedy the defect of data storage possible overflow to lead the latest data loss in the data storage system, this paper proposed a method using data rewind mechanism to store data to solve data storage possible overflow problem. The result indicate that the discrete data storage area is turned into end to end of the closed loop Using data rewind mechanism, to realize a data storage does not overflow. In view of data rewind lead to the problem of incomplete data, the paper put forward the method of the backward analysis, by comparing the adjacent data storage space whether there is the intersection to determine the complete data, incomplete data is discarded.
A Model of Caching Geo-Data Sharing Based on Computer Cluster Technology
Authors: Liu Yuan Ming , Zhang Wan Chang
Published: June 2012

It is well known that by using caching geo-data, the pressure from a GIS server is alleviated greatly, and the client experience is improved sharply. At present, most tools for generating caching geo-data suffered a poor performance in transferring over networks, especially when the parallel computing technology is not adopted. In this paper, we introduce a middleware model based on MPICH2 and OGC WMTS. Moreover, we apply the computer cluster technology to generate tiles over the huge size of image data to high up the response time rapidly and efficiently. The model as the foundation of realization will be used to implement the caching geo-data interoperability by standard interfaces that process various types of geo-data including the distributed resources throughout the network.
Design of the Software System of a Digital Axle Detector
Authors: Wang Yan , Zhang Li Jun , Han Xiao , Yin Zhao
Published: June 2012

Axle detection is an important way to ensure the safety of rail transport. To meet the requirements of the Ministry of Railways, ZTY-1 type digital ultrasonic flaw detector is developed. It is designed based on VC++ 6.0 and runs on the PC system. The detector consists of five functional parts, which are flaw detecting, daily performance checking, quarterly performance checking, probe test and data management. In this paper, design of the detector’s software system is introduced, as well as solutions to some problems such as waveform flicker, double detection, waveform playback and document print.
Low-Altitude Airship Remote Sensing Images Matching Based on Improved Hybrid Ant Colony Algorithm
Authors: Pan Bang Long , Yi Wei Ning , Wang Xian Hua
Published: June 2012

Low-altitude unmanned airship remote sensing is attractive to various applications. However, at present, since the airship is bulky, weak to resist wind, unstable to flight attitude, and can not be equipped with specialized remote sensing sensors, image data processing is confronted with new challenges when traditional data processing methods are used. In this paper, improved hybrid ant colony algorithm (HACA), a new image matching method, is proposed. Firstly we perform a pre-registration process that roughly aligns the image pairs by GPS/electronic compass geolocation. Once the pre-registration is completed, a fine-scale registration process is executed by applying a hybrid algorithm of genetic algorithm (GA) and ant colony algorithm (ACA) based on neighborhood search strategy that is detected by the linear quadtree Morton coding. The image pairs are then matched by using optimal solution obtained from the automatic updates of ant colony pheromone. By compared with traditional genetic algorithm and ant colony algorithm, the improved HACA results show that search calculation time is increased by the maximum 406℅, standard root mean square error of image matching by the best 235℅. The experiment result proves that improved HACA exactly provides an effective method for image matching. The local maxima of the function can be avoided efficiently and search speed of the global optimum is increased greatly.
A Model Study on Emergency Information’s Spread under Mobile Internet Environment
Authors: Hou Xi Wang , Shu Hua Ying , Zhao Yuan Ping
Published: June 2012

With public emergencies’ frequent occurrences and mobile internet’s fast developments, emergency information managements under mobile Internet environment become a hotspot of study.This paper applies the complex network theory to the study on emergency information’s spread under mobile internet environment. This paper constructs the emergency information’s spread model with different clustering coefficient under mobile internet environment to study emergency information’s spread trend. The result shows that under mobile internet environment there is high relevance between the emergency information’s spread trend and the topological network’s clustering coefficient. Governments can adjust the clustering coefficient to improve the management of emergency information under mobile internet environment.
Trademark Image Retrieval Using Weighted Region Information Entropy
Authors: Sun Qiang Qqiang , Ma Zhen , Dong Bin
Published: June 2012

This paper describes a new trademark image retrieval method based on the weighted region information entropy. In the first stage, image is rotated according to principal orientation, and the object region in the rotated image is extracted. Then, the object region is partitioned into a lot of sub-blocks along its circle orientation. In the third stage, the weighted information entropy of each partitioned region is computed, which construct a feature vector for describing the shape of the image. Finally, the Euclidean distance is adopted to measure the similarity between the images based on the feature vector of each image obtained. Experiment results show that this method can keep good invariance under translation, rotation, and scale, and the retrieved results match human visual perception very well.
An Alpha-Dominance Relation in Disjunctive Set-Valued Ordered Information Systems
Authors: Lv Yue Jin , Yang Wu Song
Published: June 2012

By defining the degree of dominance between two sets with respect to a certain criterion, a new alpha-dominance relation is proposed in this paper. And then a rough set approach based on this relation in disjunctive set-valued ordered information systems is presented. After that, a ranking method for all objects is introduced to the disjunctive set-valued ordered information systems, and a numerical example is illustrated to demonstrate the validity of this ranking method.
Properties of Fluorene Derivatives: DFT Investigation
Authors: Chen Bo Wei , Chang Guan Jun , Zhang Lin
Published: June 2012

Fluorene derivatives are typical semiconductor materials. The electronic structures of Fluorene derivatives were successfully investigated by density functions theory (DFT). Furthermore, the HOMO and LUMO energy levels will be changed owing to the introduction of some aliphatic chains in the fluorene. So through theoretical investigation of electronic structure and molecule orbit by the DFT method, the variational UV-vis absorption spectra of fluorene derivatives due to variational levels were explained.
Pore Structure Characterization of TiO2-SiO2 Composite Aerogel Prepared via Ambient Pressure Drying by Sol Pre-Modification Process
Authors: Liu Jing Xiao , Bai Lu Nan , Shi Fei , Hu Zhi Qiang , Jiang Yan Yan , Zhao Ting
Published: June 2012

In this paper, TiO2-SiO2composite aerogels were prepared via ambient pressure drying by sol-gel and sol pre-modification method. The pre-modification solution consists of hexamethyldisiloxane (HMDSO) as buffering agent, trimethylchlorosilane (TMCS) as modifier and hexane as organic solvent. The pore structure of TiO2-SiO2composite aerogels was characterized by N2adsorption-desorption method. The effects of HMDSO/TMCS volume ratio on the pore structure and properties of TiO2-SiO2composite aerogel were studied. The results indicate that the pre-modification of TiO2-SiO2composite sol by adding HMDSO/TMCS/Hexane solution could shorten the preparation period. Increasing the amount of HMDSO is favorable for obtaining TiO2-SiO2composite aerogel with higher specific surface area and pore volume. The best volume ratio of HMDSO/TMCS/composite sol for preparing mesoporous TiO2-SiO2composite aerogels were 12:6:120 and 12:12:120, with which the specific surface area and pore volume of the obtained TiO2-SiO2composite aerogel are 425.2～645.4 m2/g and 0.80～2.85 m3/g, respectively.
Application of Wavelet Analysis Technique in the Life Sign Detection below Solid Material
Authors: Zhang Zhen , Liu Fang
Published: June 2012

In life sign detection below solid material， radar echo signal is very weak and hard to extract. For solve this problem, weak life signal de-noising based on wavelet transform is studied. Through the studies of wavelet threshold de-noising method, the use of it in weak life signal de-noising in strong noise background, and the verification of simulation by Matlab, the results shows that wavelet threshold de-noising method can remove the noise signal from weak life signal effectively and be an effective de-noising and extraction method for weak life signal.
Study on the Adsorption Behavior of Chrome and Manganese on Potassium Tetratitanate Whisker
Authors: Wang Song Mei , Liu Lu Kuan , Xu Wan Zhen
Published: June 2012

A new method for the separation and preconcentration of Chrome and Manganese using potassium titrationate whisker was developed prior to the determination by FAAS. The influences of analytical parameters including amount of sorbent, the adsorption capacity, the coexistence ion influence and the adsorption behavior were also studied by the flame atomic absorption spectrometry, the effects of concomitant ions were also examined. The detection limits (3s) were 15ng•mL-1 and 44 ng•mL-1. The method was applied to the determination of analytes in real samples, such as tea and environmental samples, etc. and good results were obtained(relative standard deviations93%).
Synthesis and Luminescence Characteristics of Zn (II) Complexes with 2’-Hydroxyacetophenone-Furan-2-Carbohydrazine
Authors: Tai Xi Shi
Published: June 2012

A novel aroylhydrazone ligand, 2’-hydroxyacetophenone-furan-2-carbohydrazine, has been synthesized and characterized by elemental analysis, infrared spectrum and X-ray single crystal diffraction. The complex of Zn (II) with 2’-hydroxyacetophenone-furan-2-carbohydrazine has also been synthesized and characterized by elemental analysis, infrared spectrum and UV spectra. The luminescence properties of ligand and its Zn (II) complex were investigated in solid, respectively. The results show that the ligand exhibit yellow-green luminescence at 531 nm and the Zn (II) complex exhibit blue luminescence at 488 nm.
Study on the Frontal Polymerization of Polyurethane/Hollow Glass Microsphere Hybrid Material
Authors: Wang Chao
Published: June 2012

In this article, we use propylene glycol (PPG), Chain expansion agent 1, 4-Butylene Glycol (BG), toluene diisocyanate (TDI) and hollow glass microsphere Sol as raw materials to prepare polyurethane/hollow glass microsphere hybrid materials by frontal polymerization. Here we studies how the front position varies with time and how the polymer viscosity influences the reaction rate in the frontal polymerization process, and through the comparisons with autoclave polymerization, draw to a conclusion that we can also get polyurethane/hollow glass microsphere hybrid materials by this new preparation and processing method.
Microbial Inoculants of Environmental Material in the Compost Application Research Progress
Authors: Huang Zhao Lin , Ning Ping , Liu Zhang
Published: June 2012

composting is a process of organic matter degradation and transformation achieved by microorganism, which plays a leading role during composting processes. Inoculation with proper microorganisms can raise the temperature rapidly, shorten the time of the composting, increase the degradation of organic matter and improve the quality of compost. This paper summarized the functions of microorganism inoculum and suggested that in order to solve the problems: to become the dominant strain(s) for the microorganism inoculated in the composting process; to choose the species of microorganism inoculum，the optimal inoculation quantity and the time of inoculation should be studied.
Lead Pollution and its Assessment of Roadside Soils in Suzhou City
Authors: Li Qi
Published: June 2012

Concentrations of lead in roadside soils from different function areas of Suzhou City were determined and analysed by X-Ray fluorescence spectrometer, and the method of geoaccumulation index. The results indicate that the concentrations of lead in roadside soils range from 23 to 90 mg/kg, with an average value of 37.11 mg/kg, exceeded the environment background value; the lead concentration from high to low is commercial areas, areas around station, industrial areas, urban green space and residential areas; most of roadside soils have not been polluted or only slightly polluted, except sampling site 19, 23 and 49 (moderate pollution).
Characteristics of Particulate Matter Emissions on Diesel Passenger Vehicles Fueled with GTL Based on Real-Road Operating Parameters
Authors: Lou Di Ming , Zhao Yi Zhou , Zhi Yuan Hu , Tan Pi Qiang , Zhu Yan Juan
Published: June 2012

An on-board experimental research was made on diesel passenger vehicles fueled with national IV diesel, gas-to-liquid (GTL) fuel and three other different volume ratio of mixed fuel (G10D90, G20D80, G50D50) about the regularity of Particulate Matter (PM) emission characteristics changing with velocity, acceleration and vehicle specific power (VSP). The experimental results show that: PM emission rate increases gradually with higher velocity; acceleration leads to the deterioration of emissions; curves concave at the point when VSP value equals zero. Moreover, the emission rate of particle number decreases 50% to 60% while that of particle mass decreases 30% to 45% when the volumetric mixture ratio of GTL fuel improves. It is obvious that GTL fuel improves the characteristics of PM emission significantly, making it one of the promising clean alternative fuel.
Evaluation of Zinc Pollution in Soils of Suzhou City
Authors: Han Ya Fen
Published: June 2012

Choose Suzhou city’s different functional areas (industrial zone, commercial district, near the station, residential area and urban green space) to collect 55 surface soil samples and determine the zinc content of the soils by XRF and evaluate the zinc pollution level in soils with the methods of geo-accumulation index and zinc pollution index respectively. Result: The fact that the average content of Zn is beyond the soil background value in Anhui province shows soils of Suzhou city have suffered from different degrees of zinc pollution; In industrial zone, commercial district and near the station ,the zinc content of the soils is commonly higher which is mainly related to the transportation and industrial production; the evaluated results of geo-accumulative index and zinc pollution index methods show zinc pollution in soils of Suzhou city belongs to mild pollution and partial moderate pollution and the pollution is particularly serious in industrial zone, commercial district and near the station.
Synthesis of a New Silicon-Phosphorus Hybrid Flame Retardant from Waste Silicon Oil and its Application in Polypropylene System
Authors: Song Ming Lin , Huang Ya Wen , Cao Ke , Yang Jun Xiao
Published: June 2012

A new silicon-phosphorus hybrid (SPH) flame retardant was synthesized by condensation reaction of 1-oxo-4-hydroxymenthyl-2,6,7-trioxa-1-phosphabicy[2,2,2] octane (PEPA) with waste silicon oil which is mainly consisted of the compounds of CxHySizCln. The effect of Si/P hybrid on the flame retardancy of polypropylene composites (PP/Si-P) was studied by limiting oxygen index (LOI) test and thermogravimetric analysis (TGA). The flame retarding performance of PP/SPH/MP/PER at the same loading amount is slightly higher relative to MP/PER. This, in plus to the low cost and the value in environmental protecting, makes SPH possess the application potential in flame retardants.
The Research of Low Carbon Decorative Materials
Authors: Sheng Bao Zhu
Published: June 2012

As people living standard rise ceaselessly, bedroom adornment also gradually toward modernization. Some decoration materials use the polluting, radioactive, bring of suffocation, carcinogenicity of harm cause the attention of people increasingly. The effective way to improve eliminate the house chamber environment air pollution is to develop low carbon building decoration materials and products.
Research on a Neotype of Silica Sphere Filler
Authors: Gu Wen Juan , He Bang Gui , Li Hou Bin
Published: June 2012

A neotype of silica microspheres were synthesized with dodecyltrimethoxysilane (WD10) and tetraethoxysilane (TEOS) by sol-gel method. The molecular structure was characterized by FTIR. The morphology of the filler was measured by TEM. And the properties of the filler such as thermal property and bulk density were studied by means of thermogravimetric analysis and densimeter. The effect of the schemes was dicussed. This kind of silica sphere exhibits many merits for usage as filler.
Preparation and Characterization of Novel Hollow Fiber Membrane with Multicomponent Polymeric Materials
Authors: Li Yun Qing , Xi Dan Li , Fan Shun Li
Published: June 2012

Poly(vinylidene fluoride)(PVDF), poly(vinyl chloride)(PVC), and poly(methyl methacrylate)(PMMA) were used as the main materials in the preparation of novel blend five-hole membrane. Dimethylacetamide (DMAC) and polyvinyl pyrrolidone (PVP) were used as solvent and additive, respectively. The effect of some external coagulation conditions on the property of five-hole membrane was studied. The external coagulation conditions investigated in the work were the coagulation temperature and the DMAC content in coagulation bath. The result showed that the flux increased along with the increase of coagulation bath temperature and could reach the max at 35°C, then decreased gradually. The effect of the DMAC content in coagulation bath on flux is very similar to that of the temperature. The cross-sectional structures were examined by scanning electron microscopy.
Study on Oxidation Resistance of Ti1-xAlxN Coating
Authors: Zhong C.L. , Wei P.A. , Luo L.E.
Published: June 2012

A series of Ti1-xAlxN coatings were deposited by reactive magnetron sputtering. The content, microstructure and surface morphology of the coatings were characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of Al content on the microstructure and the oxidation resistance was studied. It was found that Ti1-xAlxN compound coating exhibits a cubic structure with (1 1 1) preferred orientations. The oxidation resistance obviously improves with the increase of Al content.
Bending Properties of AA7055 Aluminum Alloy Reinforced with In Situ TiB2 Particles
Authors: Chen Dong , Chen Zhe , Zhang Peng , Zhang Yi Jie , Ma Haiheng , Wang Hao Wei
Published: June 2012

In-situ TiB2 particles reinforced AA7055 composites were fabricated through mixed-salts route and their bending properties were studied. The composites reinforced with 5 wt % and 10 wt% TiB2 exhibit higher bending strength than the unreinforced matrix alloy. The improvement in bending strength may be attributed to dislocation strengthening, Orowan strengthening, and grain strengthening. The good bonding between the reinforcements and the matrix also plays an important role.
Formation Mechanism of Low Angle Boundary of DD6 Single Crystal Superalloy Blades
Authors: Shi Zhen Xue , Li J.R. , Liu Shi Zhong , Zhao J.Q.
Published: June 2012

The specimens were machined from DD6 single crystal superalloy blades with low angle boundary. The misorientation of LAB was measured with EBSD technique in scanning electron microscope. The microstructures of specimens with LAB were examined in optical microscope and scanning electron microscope. The formation mechanism of low angle boundary of DD6 single crystal superalloy blades was investigated. The results showed that he formation of LAB which is caused by the deviating orientation from ideal [001] and the angle between the crystal orientation and shell is crystal selection process acted by dendrite competitive growth rule. Part of dendrites have changed their growth orientation a little to the decreasing [001] orientation departure angle because of solidification condition fluctuating during dendrites branching process. The LAB is the obvious interface between the deforming dendrites and their surrounding dendrites.
Properties of High Solid Content UV Curable Waterborne Polyurethane Dispersions with Different C=C Content
Authors: Jiu Yong Bin , Zeng Xin Miao , Ji Jun Hui , Zhai Yu , Wang Lian Cai
Published: June 2012

Ultraviolet (UV) curable waterborne polyurethane(WPU) dispersions based on isophorone diisocyanate(IPDI), polypropylene glycol(PPG), dimethylolproprionic acid(DMPA) and pentaerythritol triacrylate(PETA) were prepared by the conventional method of anionic aqueous polyurethane dispersions. The structure of the ultraviolet (UV) curable WPU dispersions was studied by FT-IR. Stability, dispersion particle size and zeta-potential of the WPU dispersions were characterized. Effect of temperature on viscosity of the dispersions with different C=C content was also investigated. Results showed that all UV curable WPU dispersions had high solid content (48wt%) and showed remarkable mechanical stability. The viscosity of the dispersions decreased with temperature increasing from 20°C to 60°C. When C=C content varied from 0 to 1.05meq/g, the dispersion particle size was under 300nm, zeta potentials were less than -48.9mV.
Optimization of Separation Process of Waste Polyester-Cotton Fiber by Using Response Surface Analysis
Authors: Huang Huang , Yu Yong Ling , Kong Wei
Published: June 2012

In this study, the response surface methodology was used to optimize parameters of the diluted hydrochloric acid hydrolysis method, which was adopted to separate the polyester-cotton blend fiber. The four parameters reaction time, mass fraction of hydrochloric acid, reaction temperature and solid-liquid ratio were determined by the single factor experiment as they are significant for the process of separation. By introducing the experiment of four factors on three levels designed by Box-Benhnken central composite method, a quadric polynomial regression model for the fiber weight loss rate was established. And the response surface graphs were plotted to illustrate the optimizing process. The response surface analysis determined that the optimized value of the four parameters were 98 minutes, 10.7%, 96.5 °C and 4.3 g/100ml respectively. Under these conditions, polyester-cotton blend fiber was completely separated.
The Effect of Asphalt Binder Aging on Fatigue Performance of Evotherm WMA
Authors: Qin Yong Chun , Wang Sui Yuan , Zeng Wei , Shi Xiao Pei , Xu Jian , Huang Song Chang
Published: June 2012

One of the main benefits advertised with the use of warm mix asphalt (WMA) is the decreasing aging of the asphalt binder resulting from the lower production temperature compared to conventional hot mix asphalt (HMA). Some tests were performed to determine the asphalt binder aging properties from WMA and HMA. Asphalt binders were recovered by extraction and distillation from asphalt mixtures premixed at different temperatures (140°C, 160°C, 180°C for HMA, 100°C and 120°C for WMA) in the mixing plant. Penetration@25°C, softening point (R&B) and rotational Brookfield viscosity tests were carried out. Results show that the aging of asphalt binder increases as the mixing temperature is elevated, and remarkably accelerates at the temperatures higher than 150°C. Warm mix asphalt (for example, mixing temperature at 100°Cor 120°C) can greatly reduce the aging of asphalt. Aging of the asphalt binder is one of the factors that would affect the mixture’s fatigue life. Four-point beam fatigue test samples were mixed and compacted at 140°C for HMA and 120°C for WMA, and fatigue tests with a frequency of 10 Hz and three constant strain levels (150 micro-strain, 300 micro-strain, 450 micro-strain, respectively) were performed. Results show that WMA’s fatigue life was higher than the control HMA, which indicates that it may reduce aging of asphalt binder and improve fatigue performance of asphalt mixture at lower production temperatures.
Properties Improvement of Fired Clay Bricks Incorporating with Cigarette Butts
Authors: binti Abdul Kadir Aeslina , Mohajerani Abbas
Published: June 2012

Although small in size, indiscriminate littering of cigarette butts (CBs) can cause serious environmental impact. Several trillion cigarettes produced worldwide annually lead to thousands of kilograms of toxic waste. CBs accumulate in the environment due to the poor biodegradability of the cellulose acetate filters and, in doing so, they have become the most common litter item on our planet. This paper presents some of the results from a continuing study on recycling CBs into fired clay bricks. Physico-mechanical properties of fired clay bricks manufactured with different percentages of CBs (2.5%, 5% and 10%) and also of control brick samples are reported and discussed. To improve the properties, three different mixing times were tested with 7.5% of CBs incorporated in clay bricks, specifically at 15 minutes, 10 minutes and 5 minutes respectively. The impacts of these changes on physical and mechanical characteristics were evaluated. With 15 minutes mixing time, the measurement increased up to 114% and 12% for strength and density respectively compared to 5 minutes mixing time. On the other hand, values for water absorption, initial rate of absorption and tensile strength decreased by 22%, 29% and 5% respectively. Microstructure analyses of CB bricks were also investigated using ESEM. Attempts were also made to improve the properties by incorporating 3% of steel fibre into CB brick samples. Nevertheless, the addition of the steel fibre did not significantly improve the properties or the appearance of the manufactured samples.
Study on the Factors Affecting the Anti-Seismic Performance of Steel Reinforced High-Strengh Concrete Columns
Authors: Yang Bao Sheng , Song Shi Hua
Published: June 2012

Through experimental study of six steel reinforced high strength concrete columns under low cyclic horizontal loads, the influence on anti-seismic behavior of the columns under different axial load coefficient, stirrup ratio and steel reinforced form is analyzed.The study found in addition to the fact that the anti-seismic performance of high strength concrete columns is sensitive to axial load coefficient, steel reinforced form is also an important influencing factor. For high strength concrete columns with different steel reinforced forms, appropriate adjustment of its axial load coefficient may be carried out, however the influence of stirrup ratio is very little on anti-seismic performance of columns.
Fly-Ash Usage in New Cement-Based Material for Concrete Waterproofing
Authors: Bohus Stepan , Drochytka Rostislav , Taranza Luboš
Published: June 2012

Concrete is the most widely used building material and due to its use, water tightness is one of the factors essential for many constructions. Materials applied on concrete surface as secondary protection can have various forms. One of the material group with waterproofing ability, are materials on so called "crystalline technology base". As this material is cement-based its wide world production brings significant effect on environment. To bring on building materials market new materials should be considered its environmental friendlier production. One of the ways for this group of materials with crystalline abilities is replacing cement by other substituent, at best by secondary raw material. This would bring double advantage, lowering usage of cement and on the other hand use of already produced secondary raw material. This article deals with new developed materials based on "crystalline technology" with cement partly replaced by fly-ash substituent. At this article are presented results of new developed screed and coating modifications and its effectiveness on concrete waterproofing.
Thermal Stress Numerical Simulation on Concrete Hydration Heat of Giant Floor in Deep Foundation Pit
Authors: Han Guang Dong , Guan Chang Sheng , Cheng Ji
Published: June 2012

The finite element analysis software, during the pouring of concrete for the temperature field and stress field in a numerical simulation analysis. Analysis showed that the concrete core temperature changes greater maximum thermal stress in mass concrete bottom and around the site and soil transfer, far less than the concrete tensile stress, the temperature will not crack.
Research on Corrugated Cardboard and its Application
Authors: Bi Liu Ju
Published: June 2012

This paper states a review on the rapid development of the corrugated cardboard at home and abroad, and gives an introduction of its environmental protection, economical practical advantages and remarkable achievements in the packing industry. Combining with international development trends, this paper points out that domestic design of the corrugated cardboard product is still in the early stage, and its application research should be strengthened. In the end, this paper combines with domestic and international outstanding design examples to analyze the application prospect of corrugated cardboard in the fields of social activity and public life.
Biosorption of Uranium by Deinococcus radiodurans Cells under Culture Conditions
Authors: Liu Ming Xue , Dong Fa Qin , Zhang Wei , Kang Wu , Nie Xiao Qin , Wei Hong Fu , Sun Yu , Du Xu Guang
Published: June 2012

The biosorption of uranium by Deinococcus radiodurans cells under culture conditions was studied in this research. The growth curve showed that uranium did not markedly inhibit the growth of Deinococcus radiodurans cells in short culture time. The biosorption results showed that the Deinococcus radiodurans cells had high biosorption capability for uranium under culture conditions with max biosorption efficiency of 86%, and max biosorption quantity of 230 mg g-1. The results indicated that Deinococcus radiodurans can be used as the good radioactive wastewater decontamination biosorbent under culture conditions
Effect of the Addition of Nano-β-TCP on the Microstructure of Mg-Zn-Zr Alloy
Authors: You Chen , Bi Yan Ze , Chen Min Fang , Sun Yue , Liu De Bao
Published: June 2012

In this study, a mental matrix composite (MMC) made of Mg-3Zn-0.8Zr alloy as a matrix and β-TCP particles as reinforcements were prepared for investigating the effect of β-TCP spherical particles sized in 100 nm on the microstructure of that alloy. The grains of as-cast or as-extruded Mg alloys systematically decreased from about 80 μm to about 30 μm with the choice of β-TCP contents. X-ray diffraction (XRD) analysis and optical microscopy (OM) observations show that the Mg-3Zn-0.8Zr-β-TCP (1.0 or 1.5, in wt %) composites were composed of various phases in addition to Mg and MgZn2 comparied with Mg-Zn-Zr alloy. New diffraction peaks appearing in the MMC, which suggests that a potential interaction occurred between β-TCP and the matrix. Transmission electron microscopy (TEM) images reveal that secondary phases, which wraps upon the surface of β-TCP, are uniformly distributed in the grains of Mg-Zn-Zr alloy. Energy spectrum analysis shows that the component of dark-colored parts is equivalent to β-TCP, but the component of light-colored parts is Mg-Zn-Ca, which demonstrates that there is a real interaction occurred between the matrix and β-TCP.
Reaction Mechanism Study on Combustion of Micro Nanometer Iron Powder
Authors: Zhang Chuan Mei , Jin Jing , He Dan Dan , Zhang Hao , Jiang Jie , Gao Xin Yong , Gao Wen Jing
Published: June 2012

Thermogravimetric curves of micro nanometer iron powder’s combustion were studied in different heating rates that were 10K/min, 20 K/min, 30 K/min and 40 K/min, and the particle sizes of iron were 100nm and 20μm. The iron’s kinetic parameters of combustion reaction were calculated by Coats-Redfern integral, differential and Kissinger methods, then the kinetic model was determined and the most probable mechanism function was verified by Popescu method. The results show that different heating rates, particle sizes and calculations can affect kinetic parameters and reaction mechanism. The activation energy of 100nm and 20μm iron powder’s combustion is 122.48 KJ/mol and 161.64 KJ/mol respectively. The combustion reaction of micro nanometer iron powder is controlled by random nucleation and subsequent growth model which is in agreement with Avrami-Erofeev equation. Rational control for the temperature and reaction time are conducive to optimize the combustion reaction of micro nanometer iron powder.
Microstructures, Mechanical Properties and Textures of Deep Drawing Dual-Phase Steel
Authors: Ye Jie Yun , Zhao Zheng Zhi , Wang Zhi Gang , Zhao Ai Min , Chen Jing Jing
Published: June 2012

C-Mn-Cr-Mo dual phase steel was piloted in laboratory. OM, SEM, tensile tests and XRD were used to characterize the microstructures, mechanical properties and to determine the texture. The results indicate that when annealed at 860 °C, the tensile strength of the tested steel is 440 MPa, elongation and r value exceed 35% and 1.4, respectively. With the temperature increases from 820°C to 860°C, the average grain size of ferrite increases and ferrite trends to be uniform gradually, therefore, the r value increase gradually. When the temperature is higher than 860°C, bainite forming results in reducing of r value. Al could weaken the tendency of heterogeneous deformation and modified the annealing texture by refining hot-rolling grain size. Mo-based carbides existed in hot-rolled sheet developed {111} texture in the stage of ferrite recrystallization, then re-dissolved in intercritial annealing stage so as to improve hardenability.
Study on the Mechanical Property and Microstructure of Surgical Implanted Ti-6Al-7Nb Titanium Alloy
Authors: Wang Jiang Bo , Shang Zai Yan , Yuan Zhi Shan , Zhou Jin , Feng Zhao Wei , Miao Wei Dong , Zhu Ming
Published: June 2012

Ti-6Al-7Nb titanium alloy is attractive to medical device industry for orthopedic applications, such as total hip replacement systems, fracture fixation plates, intermedullary rods and nails, spinal devices, screws, and wires. Substituting Niobium for Vanadium as the beta stabilizing element, Ti-6Al-7Nb titanium alloy shows higher biocompatability than Ti-6Al-4V titanium alloy. The present research is designed to investigate the influence of annealling temper on the mechanical properties and microstructures of Ti-6Al-7Nb titanium alloy, by optical microscopic (OM) and scanning electron microscopic (SEM), and tensile test. The results show that the microstructures after recrystalization heat treatment comprise a mount of equiaxed α grains in the matrix of equiaxed β phase with α (hcp)/ β (bcc) platelets. The microstructures with partial recrystalization α phase possess better mechanical properties which conform to the ASTM F 1295 standard and ISO 5832-11 standard. Compared with Ti-6Al-4V titanium alloy and CP titanium alloy, Ti-6Al-7Nb titanium alloy is suitable to be used as implanted biomaterial devices to replace ill-functioning or missing tissues or organs.
Study Influence of Plastic Deformation a New Extra Low Carbon Stainless Steels XCr17Ni7MoTiN under the Surface Finish when Drilling
Authors: Jurko Jozef , Džupon Miroslav , Panda Anton , Zajac Jozef
Published: June 2012

The basic hypothesis of this article focuses on the study changes in mechanical properties of stainless steels XCr17Ni7MoTiN under surface finish when drilling. The problem of drilling holes with diameter D=10 mm resides in the fact that 30 to 40% of these holes do not comply with prescribed requested requirements. This article presents the results of experiments focusing on the study of the damage process in helical drills with diameter d=10.0 mm when drilling into austenitic stainless steel XCr17Ni7MoTiN. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters. Experimental results were verified in the production of holes in products for the food industry.
Influence Principle of Ultrasonic Vibration on the Rheological Behavior of Materials
Authors: Li Xin He , Wang Zhe , He Xia Hui
Published: June 2012

An experiment equipment for indentation test on the partial material was designed, which was acted by ultrasonic coupling with the pressure load. In the pressing experiment, the 7050 aluminum alloy and Hastelloy C-276 nickel-based alloy were chosen, and the effect principle and mechanism of energy transmission of ultrasonic vibration pressing on the rheological behavior of the single point of the material were studied. The results show that, ultrasonic energy can reduce the load and promote the efficiency for the plastic deformation process of material, which is performed by a single point load. This work declares that, when ultrasonic field is added to the partial rheological interface, the metal in the deformation zone slides in the form of pulses. Meanwhile, the grains of sliding material perform a resonance response, which is encouraged by the sliding pulse, and the high energy shortwave phonon generated. It spread to the high density dislocation crystal boundary in the deformation zone, leading the energy jump of those grains. Finally, this energy is translated into the plastic distortion energy of the metal.