bluuebunny/crossref_metadata_2025 huggingface dataset:
Measurement Rod Device for Outside Raceway Diameter of Slewing Bearing Inner Ring
Authors: Tan Li Bin , Yu Xiao Liu , Liu Jian
Published: December 2012

Bending deformation of existing measuring rod will influence the centring of measuring head and raceway center. Aimed at this problem, a kind of measuring rod device is designed, which used for detecting the diameter of outside rolling path center of slewing bearing. The mechanical structure and the working principle of the measuring rod device are introduced. Added support structure can reduce the measuring rod deformation significantly is obtained based on error analysis and the finite-element method simulation analysis.
Explore of the Cause of the Damage of Crosshead Guide of 5S50MC-C Diesel Engine
Authors: Wang Lian Hai , Wang Xu Sheng , Song Xiu Fu , Wang Peng
Published: December 2012

The crosshead guide sliders of a diesel engine damaged in a container ship. The type of the main engine is MAN B&W 5S50MC-C. In order to find the reason of the damage, we proposed a solution basing on checking of the damaged parts. Also we explored and verified the reasons leading to the damages of crosshead guide sliders. Besides that, we considered of professional laboratory data of the testing of lube oil samples particularly. According to the solution, the management completed the maintenance successfully, and the diesel engine has been running well till now. So the method of the solution proposing is rational and efficient.
Investigation on Improving the Recovery of Molybdenum in Bulk Flotation of Mo-Copper Sulphide Ore
Authors: Cao Qin Bo , Wen Shu Ming , Liu Dan , Shen Hai Ying , Deng Jiu Shuai , Xian Yong Jun , Bai Shao Jun
Published: December 2012

Improving the recovery of molybdenum is a research hotspot in the bulk flotation of Mo-copper sulphide ore. In this paper, the optimum flotation parameters for a kind of molybdenite ore obtained form Yunnan province, involving the grinding fineness, pulp concentration, dosages of kerosene and butyl xanthate, were determined in order to improve the recovery of Mo in the bulk Mo-copper flotation. In addition, a close-circuit flotation test was also conducted to simulate the practical process. A Mo-copper concentrate with Mo grade of 3.02% and recovery of 93.46% was obtained through the close-circuit flotation test, which satisfy the requirement for the bulk flotation of Mo-copper ore.
Jet Flotation Column System Structure Design and Numerical Simulation of Two-Phase Flow
Authors: Yang Run Quan , Wang Huai Fa , Liu Jian Chao
Published: December 2012

A laboratory scale jet flotation column system was designed and air inflation for flotation column was provided by jet aerator with a chamber. In order to understand interior flow field distribution of jet aerator and flotation column, two-phase turbulent flow model was established by use of commercial computational fluid dynamics (CFD) software FLUENT 6.3.26. Modeling of the flow field was firstly established with GAMBIT 2.3.16; standard k-ε turbulence model and multiphase flow model MIXTURE were adopted for gas-liquid two-phase numerical simulation about jet aerator and flotation column. The simulation results show that gas-liquid two-phase mixing have been established by the cavity entrainment vortex flow in jet aerator with a chamber, and the distortion was really occurred although the reversed cone feed inlet have been designed, at the same time non-uniform distribution of air-bubble was also simulated. Simulation results can help to optimize the structure of the jet flotation column.
The Application of Seismic Attribute in the Prediction of Inner Front Facies Sands
Authors: Yu Kai Chun , Zhu Yan , Meng Yan
Published: December 2012

The south of Daqing placanticline is mainly front facies reservoir which is chiefly the smooth, direct, narrow and small river. The size of the river is small and the reservoir thickness is mainly 1.0m-1.2m.The prediction accuracy of the interwell sandbody is only up to 60~70% under the condition of existing well network and well spacing, causing the relatively worse development effect. In order to raise the prediction accuracy of the interwell sandbody, it proposes the thinking of identifying the boundary and orientation of the inner front facies by means of the combination of wells and seismos of 3D seismic data. After the comparative analysis of the wells and the seismos, it determines the seismic attributes which can reflect the sandstone and identify mudstone preferablely, and proposes the method of reservoir description by means of the combination of wells and seismos which makes the prediction accuracy of the interwell sandbody reach to 80.77%.
The Significance of Shale Gas Development in China
Authors: Wang Jian Guo , Zhang Hai Jie , Liu Cui Cui , Lou Li Xia
Published: December 2012

China is facing a severe situation of energy resources. High oil dependency is seriously threatening our economy’s fast and stable development. The US has successfully achieved the commercial development of shale gas, which has decreased its oil dependency, and also contributed to its natural gas geology and petroleum engineering technology development. Both Chinese and U.S. geological experts predict that China has similar quantities of shale gas reserves as founded in the United States. This paper aims to clarify that producing shale gas resources has economic significance of energy security and environment protection, and scientific significance of promoting the further development of natural gas geology and petroleum engineering subjects.
Research on Oil Field Complicated Fracturing Curve PSP Engine and Data Model Based on Web
Authors: Yuan Jing Shu
Published: December 2012

In this paper, a whole fractured curve data model management framework is proposed, which defines all kinds of components which integrates many functions, such as fractured curve data parsing, uploading, curve data managing, curve querying and curve playbacking and so on. By means of meta-data, a kind of meta-data data model is constructed which is employed to describe fractured curve formation, makes the architecture model possessing scalability. The architecture model proposed is able to solve complicated fractured curve data management issue, the system has been applied to Daqing field.
Optimized Model of Slotted Liners Completion Parameters in Horizontal Well
Authors: Fang Quan Tang , Chen Wei , Wang Rong
Published: December 2012

The transient flowing model of slotted liner completion was established by superposition principle based on the geometric model of slotted liners, with the point source function and the single slotting equal to line source, and then the optimized model of slotted liner completion parameter was established with the skin factor of slotted liners completion as evaluation index. After analyzing the parameter sensitivity with cases, the slot density is confirmed as the main reason leading to flow convergence and additional flow resistance. Furthermore, the optimization principles of slotted liners completion of horizontal well are determined. These results are significant in optimizing the slot distribution pattern and parameter allocation.
Mathematical Model for Condensate Gas Flow in Porous Media with Phase Change
Authors: Liu Hua , Shi Zhi Liang , Li Xiang Fang , Gao Yun Cong
Published: December 2012

The retrograde condensation occurs in the condensate gas reservoir when the formation pressure is under dew point. The condensate appears in the formation with phase change in the process of condensate gas flowing in porous media, which change the temperature field and distribution of fluid pressure and affect flow rules of condensate gas in porous media accordingly. New momentum equations are set up, considering Non-Darcy flow effects, the phase change between condensate gas and condensate, phase velocity and fluid character, based on a simple model of three zones. Surface tension and capillary pressure were introduced into the new model. At the same time energy equations are deduced considering latent heat of vaporization and fluid-solid heat coupling. A mathematical model of multiphase flow in porous media with phase change is set up in this paper combining new momentum equations, new equations of energy with equations of mass conservation.
Pressure Drop Characteristics and Reserves Calculation Method of Gas Reservoir of Multi-Layer Unconsolidated Sandstone
Authors: Jin Pang , Liu Hong , Wang Xiao Lu
Published: December 2012

Taking Sebei gas field as an example, this paper sorts hydrostatic pressure test data over the years and summarizes the reasons that the formation pressure drop curve generates a straight line, up-warping and recurvation from the perspective of water invasion, perforation adding, layer adjusting, sand burying, and sand control as well as inter-layer interference and inter-well interference, with typical wells analyzed and explained. On this basis, two kinds of mass balance correction models which have taken the offset of the pressure drop curve into account are proposed to calculate the dynamic reserves of gas wells with different offset shapes of pressure drop curves. Practical result shows the simple concept and strong practicality of this method, which provides an effective method for the accurate calculation of dynamic reserves of such gas reservoir.
Study on Timeliness of Gasoline Analysis Adsorbed in Cotton Cloth Carrier
Authors: Liu Shu Jun , Wang Yong Hui , Yu Li Li
Published: December 2012

Study on the timeliness of gasoline analysis adsorbed in cotton cloth carrier was carried out with solid phase microextraction–gas chromatography/mass spectrometry(SPME-GC/MS), meanwhile the effects of temperature, wind speed and humidity on the timeliness of gasoline analysis adsorbed in cotton cloth carrier has been investigated. The results show that temperature is the major factor that affects the timeliness of analysis of gasoline, followed by humidity, and finally the wind speed, and the corresponding data of timeliness, derived equations and correlation are provided.
A Method to Determine the Turbulence Coefficient of High Rate Gas Reservoir
Authors: Wang Fan Liao , Li Xiang Fang , Shi Jun Tai , Xu Bing Xing , Hu Su Ming , Yang Xin Zhou , Zhao Jing Jing
Published: December 2012

The flow regimes included low velocity non-Darcy flow, Darcy flow, inertia flow, and turbulence in some porous media. In abnormal high pressure gas reservoir, the flow velocity was higher than conventional reservoir. Due to turbulence flow, there would be unique flow characteristics in these reservoirs. The deliverability equation of gas well should be expressed by cubic term, containing Darcy term, Visco-Inertial term and turbulence term, instead of Forchheimer’s quadratic equation. The turbulence coefficient, the main parameter in the cubic term, was directly related to the absolute open flow. So far, there is no method to obtain this parameter based on gas field data. Also there is no acceptable correlation for the turbulence coefficient applicable to field conditions. An empirical correlation was established using multiple linear regression method to determine the turbulence coefficient through the Ka Lasu’s well test data. We also calculated the parameters for the other well in this field. The results show that this correlation is more accurate and more useful than the formula established by Ezevdembah on basis of the core data in laboratory.
Synthesis and Properties Measurement of Pour Point Depressant
Authors: Xu Ying , Guo Rui
Published: December 2012

The amidation grafted copolymers derived from styrene-maleic anhydride copolymer were prepared and characterized by FTIR. Their intrinsic viscosity and crystal morphology were measured. The prepared polymers were investigated as pour point depressants (PPD) and flow improvers for waxy crude oil, and it was found that the depression effect of PPD modified by mixture amines was more effective than single amine, and the maximum depression was obtained by the sample that modified by mixture amines from 13 °C to 4 °C (ΔPP = 9 °C, at 3 000 ppm). The effect of the PPD modified by mixture amines on the flow properties of waxy crude oil was investigated. The result show that the viscosity decreased from 1 223 mPa.s to 81.3 mPa.s at 13 °C and 3 000 ppm. In addition, the crystal morphology have also been improved for the same sample and conditions.
The Effect of Water Activity in Shale on Wellbore Instability
Authors: Li Tian Tai , Zhang Ming
Published: December 2012

It is accepted that the water flux in/out of the shale during drilling is the key factor, which controls wellbore instability. This flow can be divided into two components:1) the hydraulic flow due to the difference between the wellbore and pore hydraulic pressure; 2) the osmotic flow due to the imbalance between activities of the shale and the drilling fluid. The former can be prevented by adjusting the wellbore hydraulic pressure balance in the well hole, while the latter is much more difficult to control . The water activity of shale is a controlling factor in many areas of drilling. It impacts all situations wherein the temperature or the stress state of a shale is altered such as in wellbore stability, drilling rate and hydraulic fracturing. This chemical “potential activity interaction” produces a mechanical failure due to the movement of water in/out of shales. In order to have no shale alteration, it requires that the chemical potential of each component must be the same in all phases. This is seldom the case. After a lot of studies the shale activity is shown to be a function of pressure and temperature. Results showed inverse relationship between the platelet distance and the shale water activity. This experimental method proves to be a reliable and efficient way for studying the relationships for the shale water activity, comfining pressure, temperature, and platelet distance.
New Theory and Technique of Geosciences in Oil & Gas Exploration and Development
Authors: Yao Ya Ming , Yang Zi Qi
Published: December 2012

As an irreplaceable energy, petroleum play more and more important role in global economic development and civilization progress of human society. With the further exploration activity and development of exploration degree, it becomes more and more difficult. Under the guidance of anticlinal theory, most anticlinal reservoirs have been found and we are confronted by complicate target. However, the development of new geological theories, such as geodynamics of sedimentary basins, petroleum system, deep basin gas and hydrocarbon accumulation dynamics, lay the foundation of sustained development of exploration activity. New technique and methodology of basin analysis and modeling, description of reservoir, imagery log, supply science guarantee for sustained development of exploration activity.
Production Dynamic Method to Determine the Critical Production of Bottom Water Reservoir
Authors: Zhang Liang , Shi Shang Ming , Yan Chang Hui , Gan Ning
Published: December 2012

Tahe oilfield of Triassic oil under low amplitude anticline group monolithic sandstone reservoirs with bottom water features, having a uniform oil-water interface, water energy sufficient. The current production wells generally see water, water cut rising too fast. Horizontal well bottom water coning phenomenon is outstanding, later period of high water cut stage manages difficulty to increase, water blocking measures have a low efficiency. Determine critical output, to improve production well life, efficient development reservoir has important significance .Based on the study of dynamic characteristics of single well and geological analysis of factors determining the critical output, and the application of numerical simulation method to verify the reasonable threshold quantity production. This method is simple and practical, can accurately make the critical output of single well.
Study of Flow Characteristics and Control Circuit on High-Speed Solenoid Valve
Authors: Li Wen Hua , Shao Wen Lin
Published: December 2012

Through the analysis of the flow characteristics of the high-speed solenoid valve, the conclusions that the PWM signal duty ratio is the main factor affecting the solenoid valve flow is obtained, a new available any PWM pulse signal and control circuit are proposed. Further, circuit schematic is simulated by means of SIMULINK tools in MATLAB environment and Verify its stability. A time-sharing drive circuit is design based on the PWM drive mode. The driver circuit have function which is high-current open, small current maintain. Open current and maintain current of Solenoid valve can be adjusted through this circuit. Therefore, the circuit can adapt to different parameters of the solenoid valve. A wide range of applications.
Fuzzy Reliability Calculation of Rolling Bearing’s Life
Authors: Wang Chun Hua , Qu Hui
Published: December 2012

According to the traditional method of rolling bearing’s life calculation, the paper analyses the existing problems and calculative inaccuracy of it, puts forward the method of calculating the rolling bearing’s life by using basic Fuzzy reliability theory and establishes the model of calculating rolling bearing’s fuzzy reliability Life. Calculating the rolling bearing’s life by using Fuzzy Mathematics overcomes the shortcoming of traditional calculation. It is closer to objective reality.
Study on Belt Conveyor Direct Driven by External-Rotor PMSM
Authors: Feng Gui Hong , Yu Jian Ying , Zhang Bing Yi , Wang Bing , Sun Han Guang
Published: December 2012

As material transmission equipment, belt conveyor is widely used in coal, electricity, machinery and other industries. This paper proposes a belt conveyor that directly driven by external-rotor PMSM, the drive-roller is the external-rotor, remove coupling, reducer and hydraulic coupling. The new drive system features low power consumption, high efficiency, minimum in size and weight, stable and noiseless action. Ensure the same transportation capacity, taking the SSJ1000/2×75 belt conveyors as object design a 100kW external-rotor PMSM direct drive belt conveyor. The analysis result shows the new PMSM direct drive belt conveyor is feasible; at last, design a water cooling system for the fever problem of the new belt conveyor.
Research on the Application of Mo-Ni Ore Pre-Discarding Tailings by Small-Diameter Hydrocyclone
Authors: Luo Yong Qiang , Ren Rui Chen , Li Cai Xia
Published: December 2012

For the Mo-Ni ore that mineral composition is complex, and the grade is relatively low, the flotation’s effect is not good in advance for enrichment, because of the influence of fine grained level gangue minerals. The small diameter hydrocyclone were used to pre-discard tailings, with the best pulp density and feed pressure, the rate of throwing is the 30%, and then the flotation obtained a good beneficiation index. The crude ore that contains Mo 2.04 %, Ni 1.87 %, through the closed-circuit test won a concentrate that the grade of Mo is 8.94 % and the recovery is 91.86 %, the grade of Ni is 6.75 % and the recovery is 86.79 %. Compared with the single flotation process, it improved the flotation effect and the enrichment ratio of Mo Ni, and realized the efficient enrichment of Mo-Ni.
Application of Co-Simulation in Noise and Vibration Analysis of Shearer
Authors: Zhao Li Juan , Tian Zhen
Published: December 2012

In order to investigate the noise and vibration characteristics of shearer, through the analysis of shearer found that the nonlinear instantaneous impact loading caused by cutting pick in the cutting process is the main disturbance source of the noise and vibration,the simulation pro- gramme of cutting pick momentary load was worked out by the implementation of MATLAB. The vibration of the key parts was obtained through the analysis of the rigid-flex coupled model of shearer which was established based on a co-simulation virtual prototype frame,and found that the vibration of the shell stretched out side is more severe, the shell subjacent ear under a larger dynamic stress, the planet carrier has a evident torsional deformation. According to analysis results, the optimized shell vibration significantly weakened, mechanical performance improved drama- tically. The analysis results provide an important basis for improving the shearer cutting unit design and reducing the noise level of coal face.
Application of SPH in Numerical Simulation of Roadheader Hard Rock Cutting
Authors: Zhao Li Juan , Zhou Zhen Hua , Guan Qing Zhong , Tian Zhen , Che Xiao He
Published: December 2012

The yaw rock-breaking processes of roadheader single pick at different positions have been simulated by using LS-DYNA, and the dynamic process that pick-shaped cutters cut hard-rock has been analyzed with the technique of SPH(Smooth Particle Hydrodynamics). It has been found that separating rock into smooth particle hydrodynamics(SPH) units can effectively simulate and analyze deformation, damage and other phenomena of rock to lay a foundation of pick design, processing and failure modes analysis. The results of calculations show that this kind of new algorithm is feasible and effective to simulate rock penetration and pick mechanics problems.
Numerical Simulation Analysis of the Nanyangpo Coal Mine Anchor Support Method
Authors: Zhang Mei Chang , Fei Peng Cheng , Zou De Long
Published: December 2012

The bolt support is important to ensure the stability of surrounding rock. Of Nan Yangpo mines as the research background. The application of numerical simulation software FLAC3D mine deep Bolt bolt support after the surrounding rock deformation law of the numerical simulation, Comparison and analysis of rock displacement and plastic zone under the support program changes. The results show that, The third bolt support nursing program, Significantly improve the strength and load carrying capacity of the surrounding rock, Effectively control the damage of the deep tunnel deformation that can control the roof of 4101 the return airway and two to help the stability.
Study on Reducing PM Emission and Regenerating DPF of NTP System in Diesel Engines
Authors: Wei Sheng Li , Cai Yi Xi , Li Xiao Hua , Wang Jun , Wang Pan
Published: December 2012

The test bench of non-thermal plasma system was built to study the influence of active substance which was produced by non-thermal plasma reactor on reducing PM emission, and the regression effects of DPF were also investigated. The results show that the O3 and O in active substances can strengthen the oxidization of HC and PM, which results in the additional formation of CO, and can realize the continuous regression of DPF at high speed and high load in diesel engines.
Design and Simulate the Wedge Rope Locking Mechanism on the Basis of ANSYS
Authors: Zhang Yan Jun , Kou Zi Ming , Kou Bao Fu , Zhang Jun
Published: December 2012

Comparing to the common locking mechanisms, this paper designs a new type of rope locking device which applies the wedge self-locking principle and hydraulic force-amplifying mechanism. The dynamic simulation research on the locking rope device with the usage of the ANSYS/IS-DYNA, and the simulation shows that the locking rope device can realize the self-lock of the first rope; the force-amplifying mechanism can effectively improve the security and stability of the rope locking, and reduce the abrasion of the first rope. Meanwhile, the simulation results provide a theoretical basis for the design of the locking rope mechanism.
Design of Proportional Adding Equipment of Mine-Used Dust-Fall Agent
Authors: Nie Bai Sheng , Hu Wei Xi , Zhou Yi Fan , Guo Jian Hua
Published: December 2012

In order to research the dust removal process of dust agent in coal working face, we design the proportional adding equipment of mine-used dust-fall agent for static pressure pipes in coal working face and establish the calculation model of process parameters of this equipment combining with pipe flow theory of fluid mechanics, and theoretically analyze the selection rules of components such as the high pressure piston pump and pneumatic motor power.the proportional adding equipment has been applied to coal working face. From the results of the application, this equipment for reducing dust concentration in coal working face (especially PM2.5) has the obvious effect.
The Symplectic System for the Analytical Solutions of Skew Plate
Authors: Wang Y.C. , Yang Y.Z.
Published: December 2012

The Hamiltonian Systems is applied for the bending of skew plate.In contrast to the traditional technique using only one kind of variables, the symplectic dual variables include displacement components as well as stress components. The analytic solutions are obtained under simple support which shows the effectiveness of the symplectic dual and indicates that this method is good in speed of convergence and reliability.
Numerical Simulation of Dynamic Emergency Rescue and Regularities during Mine Fire Period
Authors: Jiang Zhong An , Yi Wang
Published: December 2012

Under the comprehensive consideration of “buoyancy effect” and “throttle effect” during mine fire period, the article used the geographic information system (GIS) technology, simulated the smoke pollution area, ventilation system junction temperature and state of airflow during mine fire period. Finishing a program for dynamic simulation of emergency rescue during mine fire period, which is significant for establishing fire pre-scheme and the decision-making during fire period. At the same time, the dynamic characteristic of ventilation system and selection of escaping route is also considered, which provides foundation for the rescuing the workers underground in time.
Design of an Intelligent Fire-Fighting Robot
Authors: Li Ze Lun , Huang Zhi Cheng , Deng Xian Ling
Published: December 2012

Designed an intelligent fire-fighting robot system which can meet the requirements of teaching and experiments. Completed the design of robot body structure, the sensor system, the movement execution system, communication function of the system, the modular realization and the overall design. The hardware and software system was mainly focused in the processing of design, and the structural drawings of the mobile robot, the principle analysis of intelligent mobile robot, hardware design and the relevant procedures preparation were completed.
Research on Positive Control System with Synthetic Pilot Pressure of Excavator
Authors: Zhang Jian Zhuo , Guan Li Zhe , Li Kang Kang , Shi Meng
Published: December 2012

Based on the analysis of the working mechanism of positive control system of excavator, a new type of positive control system with synthetic pilot pressure was designed. The hydraulic model based on AMESim was established. The dynamic simulation of this new type model was done, and was compared with conventional positive control system. The results of the simulation show that the precision of the matched flow and the power efficiency is higher in the positive control system with synthetic pilot pressure than in the conventional positive control system.
Hydraulic Control System Modeling and Simulation Based on the MSC. Easy5
Authors: Luan Li Jun , Qi Xiao Miao , Ni Ji Yong
Published: December 2012

This paper creates the model of the hydraulic control system and does simulation by using powerful function of modeling and simulation of MSC. Easy5. To help support the equipment of the hydraulic control system Vertical Shaft for example Firstly, creates the model of the Vertical Shaft hydraulic control system through the software MSC. Easy5. Secondly, input relevant simulation parameters and do simulation. Finally, analyze the results of simulation.
Spindle Static and Dynamic Characteristics Analysis of Precision CNC Turning Center
Authors: Guo Chen Guang , Bai Li Guo , Zheng Bao Long , Pan Yi Shan
Published: December 2012

In this paper, a research of precision CNC turning center’s spindle is presented. Spring damper elements are used to simulate the supports of dynamic and static hydraulic bearing, and the 3D finite element models of the spindle is built. Based on finite element models of spindle, the static analysis and model analysis are performed, and the static stiffness, natural frequency and modes of vibration are put forward. The strain and stress of spindle is explored, and mode of vibration of spindle under resonance and designed working conditions is contrasted.
Simulation Study on Hydraulic Assisted Steering System of Snake Mobile Conveyor
Authors: Zhang Dong Sheng , Liu Xiao Hong , Gao Shu Jun , Du Jian
Published: December 2012

Snake mobile conveyor is a special structure new conveyor, its body composed of a number of independent frames which relative rotation and achieved conveyor’s horizontal turning. In order to insure smoothness and controllability of turning, system executed predict the feedback control on the steering fuel tank using a hydraulic-assisted steering system. Control programs: the establishment of the virtual prototype of the machine - record tractor turning angle - calculation orbit of tractor frame - to calculate the steering cylinder corresponding stretched time and displacement - the controller to control assisted steering - Complete trajectory , and simulation analysis proved that this control method is feasible.
Thermodynamic Study on the Flow Valve Made of Different Material
Authors: Zhang Xing Yuan , Chen Xi
Published: December 2012

High temperature has great influence on the rational clearance between the spool and the sleeve, even cause to the valve not working. So it is necessary to research the flow rate control valve’s thermodynamic characteristics. The 45 steel’s thermodynamic characteristic is compared with the GH783 alloy’s in this paper. The results show that the temperature raised quickly near the orifice, the time that the 45 steel takes to reach to thermal equilibration is shorter than the GH783 alloy’s. The 45 steel’s deformation tendency is similar to the GH783 alloy’s, but the 45 steel’s deformation quantity is larger than the GH783 alloy’s. At high temperature, the flow area of the valve made of GH783 alloy has little change, which has little affluence on the valve’s regulating characteristic.
The Simulation Research on Travel-Driven System of Powered Platform Lorry
Authors: Song En Zhe , Ji Chang Xi , Yin Mei Liang , Sun Jun , Yin Cheng Shun
Published: December 2012

In order to improve the power performance and fuel economy performance of powered platform lorry, this paper analyses the characteristics of hydraulic system and engine to make three-close-loop control strategy. Its physical model is built with AMESim simulation software and the three-close-loop control strategy controller for the system is constructed in Matlab/Simulink environment. To evaluate the three close-loop control strategy, a co-simulation method with AMESim/Simulink is used. The simulation results show the control strategy is effective to improve the efficiency of the hydraulic drive system, the utilization of engine power, and the life of hydraulic components.
Research on the Structure and Wear Properties of Grind-Hardened 42CrMo
Authors: Zhang Lian Yong , Sun Fang Hong , Jiang Yan Hua
Published: December 2012

grind-hardening test was performed on 42CrMo steel in the paper. Microstructure of the hardened layer was observed and the wear-resistance of hardened specimens was done too. The results showed that microstructure of the fully hardened layer was mainly composed by lath martensite; microhardness of the hardened layer was above 700HV and the abrasive wear and the adhesive wear properties of hardened layer were 2~9 times than that of the base.
Simulation Analysis on Strength of Bucket Tooth with Various Soil
Authors: Zhang Ying Ying , He Fan , Li Cheng Long , Gao Yang , Gao Peng
Published: December 2012

This paper applies large-scale finite element software ANSYS and the module of LS-DYNA to establish the solid model of bucket teeth, and according to Smoothed Particle Hydrodynamics Method (SPH) establishes the soil constitutive model. Emulating the process that bucket teeth excavate soil of three different grade ruggedness coefficients obtains the stress and statistical value of bucket tooth point; Simulation results show that: the stress concentration of bucket teeth point is more serious. When the ruggedness coefficient is0.6< f <1.0, the corresponding maximum stress is 197 ~ 309MPa, which meets the strength requirement .The damage is caused by the fatigue failure.
The Effect of CaCO3 Addition on Physical Properties of ZnO-Based Crystal Glaze
Authors: Jamaludin Abdul Rashid , Kasim Shah Rizal , Ahmad Zainal Arifin
Published: December 2012

The effects of calcium carbonate (CaCO3) addition on the physical properties of ZnO-based crystal glaze batches were investigated. Samples were fired at different gloss firing temperatures ranging from 1180-1220°C with 3 hours soaking at 1060°C crystallization temperature. X-ray diffraction (XRD) analysis identifiedthe crystal phase occurred as willemite (Zn2SiO4) and the scanning electron microscope (SEM) analysis indicated that willemite crystals are in the acicular needle like shape that formed spherulite. The intensities of willemite peaks decreased with CaCO3 addition and completely vanished at 5.0 wt% CaCO3. Varied formation of spherulites developed of the surface of crystal glaze as the flows of the glaze stretched further as the amount of CaCO3 increased.
Investigation into the Metal Oxide Surge Arrestors' Failures
Authors: Peng Ng Guat , Khan Norul Rafiq N. , Harun M. Noor , Ahmad Badrol
Published: December 2012

Metal oxide surge arrestors (MOSA) are commonly used in the electrical power system to protect the insulation from the damaging effect of lightning. This paper presents the damage characteristics and possible root cause of two exploded ZnO type arrestors. Both failures were not caused by lightning surge. They had degraded due to moisture ingress, leading to contamination and corrosion, accelerating thermal runaway effect in the ZnO elements and eventually caused early voltage breakdown under normal operating voltage. This indicated an inadequacy in the sealing components.
Influence of Silica and Zirconia Particles as Filler Loading on the Radiopacity of Dental Resin Composites
Authors: Alsharif Saad Omar , Hazizan Md Akil , El-Aziz Nasser Abbas Abd , Ahmad Zainal Arifin
Published: December 2012

The aim of this study is to evaluate the radiopacity of silica (SiO2) and zirconia (ZrO2) particles dispersed in a bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base resin and triethylene glycol dimethacrylate (TEGDMA) as a diluent. The fillers were mixed separately with bis-GMA/TEGDMA monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the radiopacity. Samples of the composites with 2.5 mm thickness were compared their radiopacity with the same thickness of the standard aluminum plate. The radiopacity of both resin matrix/SiO2 and resin matrix/ZrO2 composites increased gradually as the filler loading increased. The resin matrix/ZrO2 composites possessed radiopacity higher than the standard aluminum plate. The increase of filler loading showed highly significant differences in the radiopacity as tested by ANOVA (P = 0.000).
The Effects of Cr2O3 Addition on Fracture Toughness and Phases of ZTA Ceramic Composite
Authors: Azhar Ahmad Zahirani Ahmad , Rejab Nik Akmar , Mohamad Hasmaliza , Ratnam Mani Maran , Ahmad Zainal Arifin
Published: December 2012

Fracture toughness and phases of ceramic composites produced from alumina, yttria stabilized zirconia and chromia oxide system was investigated. The Cr2O3 weight percent was varied from 0 wt% to 1.0 wt%. Each batch of composition was mixed, uniaxially pressed 13mm diameter and sintered at 1600 C for 4 h in pressureless conditions. Studies on on their mechanical and physical properties such as Vickers hardness and fracture toughness were carried out. Results show that an addition of 0.6 wt% of Cr2O3 produces the best mechanical properties. Results of the highest fracture toughness is 4.73 MPa.m1/2,
Formation of Well Aligned ZnO Nanorods Grown on Silicon Substrate by Chemical Bath Deposition Method
Authors: Zakaria Nurulnadia , Nainggolan Hamonangan , Hutagalung Sabar D.
Published: December 2012

Zinc oxide (ZnO) nanorods have been grown on silicon substrate by chemical bath deposition method in an aqueous solution that contained zinc nitrate hexahydrate and hexamethylenetetramine. The ZnO seed layer was deposited on substrate to promote growth of ZnO nanorods. Growth temperature was varying in order to form well aligned ZnO nanorods From XRD analysis confirmed that grown ZnO nanorods has wurtzite crystal structure and grown in the [10 direction. Well aligned and better size distribution of ZnO nanorods obtained at 75°C for 1h.
Photoluminescence Properties of Porous Silicon Nanostructures (PSiNs) with Optimum Electrolyte Volume Ratio of Photo-Electrochemical Anodization
Authors: Zubaidah Maslihan Ain , Asli N.A. , Yusop S.F.M. , Rusop Mohamad , Abdullah Saifollah
Published: December 2012

Porous silicon nanostructures light-emitting diode (PSiNs-LED) will be a device for future flat screen display and can be high in demand. Main purpose of this experiment is to determine the photoluminescence properties of porous silicon nanostructures (PSiNs). PSiNs samples were prepared using photo-electrochemical anodization. P-type silicon substrate was used for this experiment. For the formation of PSiNs, a fixed current density (J=20 mA/cm2) and 30 minutes etching time was applied for the variety of electrolyte volume ratio. Volume ratio of hydrofluoric acid 48% (HF48%) and absolute ethanol (C2H5OH), HF48%:C2H5OH, were used for samples 3:1, 2:1, 1:1, 1:2 and 3:1. The effective photoluminescence properties was observed for sample C.
Structural and Thermoelectric Properties of Bi0.4Sb1.6Se3xTe3(1-X) Quaternary Compound
Authors: Kadhim Arej , Hmood Arshad , Haslan Abu Hassan
Published: December 2012

Novel hexagonal rods of Bi0.4Sb1.6Se3xTe3(1-x) (0.0x1.0) were synthesized successfully through solid-state microwave synthesis. These hexagonal rods were explored using field emission scanning electron microscopy images. The X-ray diffraction results indicate that the powders (0.0x0.8) can be indexed as the rhombohedral phase, whereas the sample with x=1.0 has an orthorhombic phase structure. The electrical conductivity gradually decreases as Se increased, resulting in an increase in the Seebeck coefficient. Ascribing to the increased Seebeck coefficient for the sample with x=0.8, the maximum power factor is 7.47 mW/mK2 at 373 K.
Application of Integer Linear Programming to an Investment Problem of a Firm in Ghana
Authors: Twum Stephen B.
Published: December 2012

This paper considers the application of Linear Programming (LP) to an investment decision problem of a firm in Ghana. The aim is to maximise the investment of the firm. The investment concern of the firm was first modelled as LP problem and then solved. A sensitivity analysis was subsequently performed on the model to assess its stability to slight variations of some selected parameters. This yielded a range of possibilities for the solution of the model and provided a basis for the selection of the best optimal solution.
Virtual Force Feedback-Based 3D Master/Slave Tele-Nanomanipulation in SEM
Authors: Li Dong Jie , Rong Wei Bin , Sun Li Ning , Xiao Wan Zhe , Zou Yu
Published: December 2012

In this paper, we focus on the need for real time nanomanipulation, a 3D Master/Slave tele-nanomanipulation platform is studied with the haptic device (Omega3) as the master and the nanopositioner (Attocube) as the slave, working in scanning electron microscope (SEM). The 3D manipulation environment is developed with the help of VR technology. The platform is controlled by the enhanced virtual coupling (EVC) algorithm. The stability of the platform is discussed with Llewellyns stability criteria. Scale factors and enhancement factor of the control system are determined, according to the force applied on master and slave terminals. Performances of the platform are tested with the ZnO nanowire manipulation experiments. Experiment results show that the platform has good performance while guaranteeing stability on ZnO nanowires manipulation in SEM using the method presented in this paper.
Biological Activity of Gold Nanoparticles towards Filamentous Pathogenic Fungi
Authors: Savi Geovana Dagostim , da Silva Paula Marcos Marques , Possato Jonathann Corrêa , Barichello Tatiana , Castagnaro Denise , Scussel Vildes Maria
Published: December 2012

Gold nanoparticles (GNP) were synthesized, characterized and their antifungal activities investigated against three pathogenic fungi of different genera and species (Fusarium verticillioides,Penicillium citrinumandAspergillus flavus). The anti-fungi treatments efficiency of the GNP (concentrations: 0, 0.05, 0.1 and 0.2 mg L-1in PDA media) were evaluated at 2, 4, 6 and 8 days after incubation by measuring the diameter of fungal colonies and investigating fungi structure alterations by scanning electron microscopy (SEM). It was observed that the GNP concentration increased, fungal colony growth diameter reduced. However, the highest GNP concentration applied in the experiment was not able to completely inhibit fungal growth. The SEM analysis of the fungi structure Au treated showed damaged hyphae and unusual bulges that were not observed in fungi that growth on medium without treatment (Control). Although up to the highest concentration of GNP media applied did not completely inhibited fungi growth, the hyphae modifications led growth reduction which could influence the toxins production by these fungi.
The Influence of Different Metal-Chelators on the Biological Profile of Nanoparticles for Gallium-68 Based Molecular Imaging
Authors: Ng Quinn K.T. , Segura Tatiana , Ben-Shlomo Anat , Krause Thomas , Mindt Thomas L. , Walter Martin A.
Published: December 2012

The use of metal chelators is becoming increasingly important in the development of new tracers for molecular imaging. With the rise of the field of nanotechnology, the fusion of both technologies has shown great potential for clinical applications. The pharmacokinetcs of nanoparticles can be monitored via positron emission tomography (PET) after surface modification and radiolabeling with positron emitting radionuclides. Different metal ion chelators can be used to facilitate labeling of the radionuclides and as a prerequisite, optimized radiolabeling procedure is necessary to prevent nanoparticle aggregation and degradation. However, the effects of chelator modification on nanoparticle pharmacokinetic properties have not been well studied and currently no studies to date have compared the biological effects of the use of different chelators in the surface modification of nanoparticles.
Study of Surface Raman and Fluorescence Enhancement of RhB Molecules Adsorbed on Au Nanoparticles
Authors: Tang Jun , Wen Huan Fei , Chai Peng Lan , Liu Jun , Shi Yun Bo , Xue Chen Yang
Published: December 2012

In this work, an interesting phenomenon demonstrating the similarities between the results from both Surface Enhanced Raman Spectroscopy (SERS) and Surface Enhanced Fluoresence (SEF) for rhodamine B (RhB) molecules adsorbed on gold nanoparticles was reported. By changing the deposition time, porous Au nanoparticle films with various densities and sizes were deposited. Via thermal annealing, the densities and sizes were modified. It is concluded from the results that the intensity of SERS and SEF varied in parallel with different Au nanoparticle films: different sizes and different densities. We believe that the results obtained can provide us with a reference when developing bio-chemical sensors based on Surface Enhanced Raman Spectroscopy and Surface Enhanced Fluorescence.
Therapeutic Potential of Biogenic Silver Nanoparticles in Murine Cutaneous Leishmaniasis
Authors: Rossi-Bergmann Bartira , Pacienza-Lima Wallace , Marcato Priscyla D. , de Conti Roseli , Durán Nelson
Published: December 2012

Many efforts in these last years have dedicated in the development of new drugs due to an increase of microbial organisms resistant to multiple antibiotics, and silver nanoparticles appears as a novel antimicrobial agent. The aim of our work was to evaluate the in vitro and in vivo antileishmanial activity of the silver nanoparticles prepared by chemical process and by biosynthesis from Fusarium oxysporum. In vitro antipromastigote activity of L. amazonensis showed that silver nanoparticles chemically synthesized (AgCHEM), biogenic silver nanoparticles (AgBIO) and amphotericin B decreased the parasite load up to 13%, 61%, and 68%, respectively. The IC50 of AgCHEM and AgBIO was 103.5 ± 11.5 μM and 31.6 ± 8.2 μM respectively. The assay of antileishmanial effect of these nanoparticles was evaluated in vivo (BALB/c mice) against L. amazonensis. The mice infected with promastigotes of L. amazonensis in the ear showed that after 10 days of treatment (twice a week for four weeks) the wound in the control (mice treated with PBS solution) was large, while the wound of the mice treated with amphotericin B (positive control) exhibited low size of lesion. The same parasitemia inhibition with amphotericin B was observed when AgBIO were used at 300 fold lower concentration, and 100 fold less concentration of AgCHEM than amphotericin B. Thus, these nanoparticles can be used in wound helping like cutaneous leishmaniasis.
Biogenic Silver Nanoparticles and its Antifungal Activity as a New Topical Transungual Drug
Authors: Marcato Priscyla D. , Durán Marcela , Huber Stephany C. , Rai Mahendra , Melo Patricia S. , Alves Oswaldo L. , Durán Nelson
Published: December 2012

Silver nanoparticles production was monitored by UVVis and TEM micrograph and they were obtained as spherical and homogenous nanoparticles with a size of ~100 nm by photon correlation spectroscopy (PCS). Silver nanoparticles, in an IC80range of 1-2 μg/mL, showed significant antifungal activity againstT. rubrum. Cytotoxicity through hemolytic activity against erythrocytes and the viability of V79 fibroblast or HL60 cells showed less toxicity than amphotericin B. The disk diffusion test showed that the silver nanoparticles exerted a similar inhibition zone that amphotericin B by a synergistic effect when added at the same time againstT. rubrumculture.
Iron oxide compositions in till and bedrock samples from the Sue-Dianne IOCG deposit, Northwest Territories and the Pipe Ni-Cu deposit, Manitoba
Authors: Dupuis C , Sappin A -A , Pozza M , Beaudoin G , McMartin I , McClenaghan M
B
Published: December 2012

This open file reports the chemical compositions of Fe oxide mineral grains (mainly magnetite and minor hematite) from the ferromagnetic fraction of bedrock and till from the iron oxide copper-gold (IOCG) Sue-Dianne deposit in the Great Bear magmatic zone, NWT
and from till around the Pipe magmatic Ni-Cu deposit in the Thompson Nickel Belt, Manitoba. These data were collected in support of research by the DIVEX research network and the Geological Survey of Canada into the use of magnetite as an indicator mineral for mineral exploration in glaciated
terrain.
Preparation, dielectric and a.c. conductivity studies on chemically treated sisal powder filled polyvinyl alcohol biocomposites
Authors: Nigrawal Archana , Chand Navin
Published: December 2012

In this paper, development and electrical characterization of sisal powder filled polyvinyl alcohol (PVA) composites is reported. Dielectric measurements were   conducted on these composites on a LCR meter in the temperature range from 30 to 150°C and in the frequency range 1 kHz - 10 kHz. The effects of temperature and frequency variation on dielectric constant (ε’), dielectric dissipation factor (tan δ) and on a. c. conductivity (σa.c.) were determined. On increasing the filler content, dielectric constant increased, it was mainly due to motion of the dipolar groups of the interfacial polarization occurring in the composites. The conductivity increased with rise in temperature.Keywords: PVA, Electrical Properties, Dielectric Properties, Electrical Conductivity