bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Walls and Ceiling on a Wind Flow in BLWT Tunnel
Authors: Hubová Oľga , Konecna Lenka , Lobotka Peter
Published: August 2014

This paper deals with determination of the parameters of simulated boundary layer in newly built Boundary Layer Wind Tunnel (BLWT). Short description of tunnel, measuring devices and possibilities of using of tunnel are mentioned here. All measurements, which were necessary for basic analysis of simulated natural wind, are shortly mentioned. The main part of this paper is devoted to additional measurements, which were necessary for detection of influences of boundary effects in part of the cross-section of tunnel where the calibration of Hot-wire anemometer is usually done. These boundary effects evoke deceleration of the wind velocity in given area. Description of additional measurements and obtained results are presented at the end of this paper.
Wind Tunnel Study of Vortex Shedding behind Cooling Tower Models
Authors: Michálek Petr , Zacho David
Published: August 2014

Wind tunnel measurements of vortex shedding behind cooling tower models were performed in VZLU. Two variants of cooling tower models were used, i.e. model with smooth wall outer surface and model with rough wall surface. Measurements were conducted using hot-wire anemometer. Time signal from the anemometer was transformed using Fast-Fourier routine into frequency spectrum. Measurements have shown significant differences between smooth and rough variant of model surface and dependency of vortex shedding frequency on Reynolds number.
Experimental Modal Analysis of the Footbridge across Vltava River in Prague Damaged by Flood in June 2013
Authors: Polak Michal , Plachy Tomáš , Maca Jiří
Published: August 2014

The investigated footbridge across Vltava River in Prague was built in 1984. Almost the entire footbridge structure was overflowed by the extreme flood in August 2002 and the substantial part of the footbridge deck was overflowed afterwards by the great flood in June 2013 again. A significant damage on the footbridge deck was found out by a visual inspection of the load-bearing structure of the footbridge after the second flood. The basic objective of the performed experimental modal analysis was the initial experimental reliability verification of the obviously damaged footbridge structure. The measured natural frequencies and modes were compared with results of the several dynamic tests which were performed regularly during the lifetime of the footbridge. The localization of potential invisible damages was carried out. The recommendations for the range and the arrangement of the static load test, which was performed afterwards for fundamental reliability assessment of a footbridge structure, were made on the basis of the evaluated results of the experimental modal analysis.
Utilization of Multibody Simulations at the Verification of the Stabilizer Bar of the Trolleybus
Authors: Polach Pavel
Published: August 2014

ŠKODA VÝZKUM s.r.o. (now Výzkumný a zkušební ústav Plzeň s.r.o.) cooperated on the development of the NEOPLAN DMA low-floor articulated trolleybus indented for the City of Boston. Multibody models and finite element models of the trolleybus were utilized in the stage of the vehicle design. The effect of using the rear section stabilizer on driving properties of the trolleybus was investigated utilizing the multibody simulations among others.
Human-Induced Vertical Vibration of the Footbridge across Opatovicka Street
Authors: Sana Vladimír , Polak Michal
Published: August 2014

The presented article is focused on a theoretical dynamic analysis of the footbridge across the Opatovicka street in Prague, which acts as a simply supported beam. The structure was loaded by an ordinary pedestrian traffic, synchronous runners and vandals. The ordinary traffic was simulated by the Monte Carlo method as a stream of moving periodic forces with stochastic parameters. The synchronous runners and vandals were modeled as a combination of biomechanical models of human body, which influenced the structure vibration only passively, and driving forces, which loaded the structure in the contact points between the human body models and the structure. The driving force was the time – dependent function based on decomposition to the Fourier’s Series and periodic triangle function. The obtained theoretical results are compared with experimental data.
Safety of Nuclear Power Plants against the Aircraft Attack
Authors: Králik Eng Juraj
Published: August 2014

This paper presents the nonlinear dynamic analysis of the reinforced concrete building of nuclear power plant to the aircraft impact. The dynamic load is defined in time on the base of the simulation of the airplane impact considering real stiffness, masses, direction and velocity of the flight. The dynamic response is calculated in the system ANSYS using the transient nonlinear analysis solution method. The damage of the concrete wall is evaluated in accordance with the standard NDRC considering the spalling, scabbing and perforation effects. The simple and detailed calculations of the wall damage are compared.
Structure Analysis Loaded by Interior Blast Effect
Authors: Makovička Daniel , Makovička Daniel
Published: August 2014

The paper determines the parameters of the explosion wave excited by a terrorist charge and assumption of the building structure of a railway station based on dynamic analysis. Certain simplified methods according to various publications, according to our own experimental results and according to 3D computations based on detailed calculation modelling of the interior of the room are compared to determine the explosive effects. Equivalent static analysis was applied to the dynamic response of the structural elements of the selected room. The damage caused to these structural elements is weighted on the basis of the angle of failure of the central axis / surface, and on the basis of the limit stress state of these structures.
Salt Spray Corrosion Performance Associated with the Glass Forming Ability of the FeCo-Based Bulk Metallic Glasses
Authors: Jiang Wei , Chen Qing Jun , Shen Jun , Zhang Fa Bi , Zhou Xian Liang , Hua Xiao Zhen
Published: August 2014

For the bulk amorphous Fe24+xCo24-xCr15Mo14C15B6Y2(X=0, 2, 4, 6 and 17) alloy, the corresponding corrosion properties associated with glass forming ability (GFA) have been carried out. Neutral salt spray corrosion test results show that the Fe28Co20Cr15Mo14C15B6Y2 alloy has the minimum corrosion rate, followed by Fe26Co22Cr15Mo14C15B6Y2, Fe24Co24Cr15Mo14C15B6Y2, Fe30Co18Cr15Mo14C15B6Y2, Fe41Co7Cr15Mo14C15B6Y2 and Ti6Al4V alloys. Specifically, the Fe28Co20Cr15Mo14C15B6Y2 alloy with the highest GFA also has the best corrosion resistance. With the increasing of Co addition, the corrosion resistance of the FeCo-based bulk metallic glasses is first increases and then decreases, which has the same trend of GFA with the change of Co elements. Furthermore, corrosion morphology are different for FeCo-based BMGs with different Co content.
Synthesis and Characterization of a New Coumarin-1,2,3-Triazole Diad
Authors: Li Hong Qi , Tian Xiu Juan , Chen Zhen , Xiao Ding , Fang Ning , Lv Yan Xiang , Gu Liang
Published: August 2014

A new coumarin-1,2,3-triazole diad was designed and synthesized by Pechmann-Duisberg reaction and click chemistry. The three-step synthetic route to the target compound afforded an overall yield of 56%. The structures of the synthesized compounds were characterized by 1H NMR, 13C NMR, IR and mass spectrum. The click chemistry provided an ideal approach for synthesis under mild conditions of coumarin-1,2,3-triazole diads which may exhibit excellent biological activities such as antitubercular activity.
Study on Photoelectric Properties of Dye-Sensitized Solar Cells Based on Thixotropy Electrolyte
Authors: Jin Li Guo , Wang Shuo , Wang Hong Jie
Published: August 2014

A series of experiments have been carried out to study on the efficiencies in solar energy materials and solar cells. Dye-sensitized solar cells (DSSCs) are good examples of where the quality of the nanomaterials and their interfacial properties are important to device performance. In this report, Nanometer TiO2 sol for coating film was prepared by cooperating hydrothermal colloidal sol with organic polymer dispersing agent (PVA). Nanocrystalline TiO2 porous films were prepared by using electro-hydrodynamic technique (EHD). The results show the films prepared by EHD technique have multilevel hierarchical structure, therefore, better optical scattering properties. Different constituent quasi-solid electrolytes with blood mimetic thixotropy were prepared by cooperating ionic liquid electrolyte with nanometer TiO2 colloidal sol synthetized by sol-gel method. The resulting Quasi-Solid-State dye-sensitized solar cells consist of nanoporous TiO2 Film and the dye N3, show conversion efficiencies up to 3.7 percent (8. 51 percent with a mask).
Pyrolytic Synthesis of Bifunctional g-C3N4 Derived from Melamine
Authors: Wu Li Cheng , Xu Huan Yan , Zhao Hang
Published: August 2014

Graphitic carbon nitride (g-C3N4) polymer material was synthesized via a simple approach by directly heating melamine as the precursor at 500°C. The phase composition, chemical functional groups, and surface morphology of the obtained product were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM), respectively. All the characterization results identified the formation of g-C3N4 with stack-layered structure. The absorption and photocatalytic performance of as-synthesized g-C3N4 for the discoloration of an active dye, Methylene Blue (MB), were proved to be excellent and control experiments inferred that adsorption and photocatalysis governed the MB discoloration under UV irradiation. The repeated experiments indicated that the obtained sample could be reused more than five times without loss of its absorption capacity and photocatalytic activity.
Visible Photoluminescence of Gas Phase Synthesized Well-Defined Germanium Oxide Nanoparticles
Authors: Xu Shang , Nan Ya Li , Sun Ling
Published: August 2014

Substoichiometric germanium oxide nanoparticles were synthesized through gas aggregation process with a careful control on the size, composition and crystallinity of the nanoparticles. The nanoparticles show broad room temperature photoluminescence (PL) in the 470nm to 600nm wavelength region. The microstructure and optical properties of the nanoparticles were investigated. We found that the photoluminescence behavior of the nanoparticles is critically influenced by their compositions. Through temperature-dependent photoluminescence and time-resolved photoluminescence spectroscopy, we concluded that the broad PL band originated from the defects in the GeOx shell layers, rather than the quantum-confinement effect.
Development and Application of a Novel Nucleic Amplification Kit on Rapid Detection of Various Types of Staphylococci Strains
Authors: Deng Yang , Liang Yan Rui , Li Lin , Li Bing , Su Jian Yu
Published: August 2014

A loop-mediated isothermal amplification (LAMP) method for rapid detection of various staphylococci strains and associated antibiotic resistance determinant had been developed and evaluated in this study. Six primers, including outer primers, inner primers and loop primers, were specially designed for recognizing eight distinct sequences on four targets: 16Sr RNA, femA, mecA, and orfX. Twenty-seven reference strains, including various species of gram-negative and-positive isolates, were included in this study to evaluate and optimize LAMP assays. The optimal reaction condition was found to be 65°C for 45 min, with detection limits at 100 fg DNA/tube and 10 CFU/reaction for 16S rRNA, 100 fg DNA/tube and 10 CFU/reaction for femA, 1 pg DNA/tube and 100 CFU/reaction for mecA, 10 DNA/tube and 10 CFU/reaction for orfX, respectively. Application of LAMP assays were performed on 166 various types of staphylococci isolates, the detection rate of LAMP assays for the 16Sr RNA, femA, mecA, and orfX was 100% (166/166), 98.5% (64/65), 94.3% (66/70), and 98.6% (69/70) and the negative predictive value (NPV) was 100%, 98.1%, 92.3%, and 92.7% respectively; with a 100% positive predictive value (PPV) for all three targets. In conclusion, LAMP assays were demonstrated to be useful and powerful tools for rapid detection of various staphylococci strains.
Adsorption of Enzyme on Modified Diatomite by Organo-Functional Group and Metallic Ions
Authors: Huan Wei Wei , Tian Mei Juan , Wang Zhi Yin , Yang Yu Xiang
Published: August 2014

In this paper, two calcined Zhejiang diatomite and Jilin diatomite were modified by organic amine, polyethylene glycol, organocationic ions, organofunction group and metallic ions to adsorption and immobilize enzyme, the different organo-function group and metallic ions lead to the capacity of adsorptive enzyme changing with the variation of IEP value.
Study on Optimization of Extraction Technology for Bitter Melon Seed Oil by Supercritical CO2
Authors: Xu Li , Wang Hui Li , Wu Chun Yan , Zhou Ming Hua , Wang Ya Yun
Published: August 2014

Bitter melon seed oil (BMSO) extracted by supercritical CO2 was determined in the present study. At first, a single factor and orthogonal experiment were performed to explore the parameters of extraction pressure, temperature and time on the yield of oil. Then the constituents of extracted fatty acid were analyzed by GC-MS. The results showed that under the best conditions of extraction pressure (25MPa), extraction temperature (50°C) and extraction time (100 minutes), the yield of oil from shelling bitter melon seed was 36.1% with the CO2 flow rate kept at 10kf/h. Moreover, BMSO was rich in linolenic acid and stearic acid, accounting for 42.362% and 31.481% respectively.
Characteristics on Soil Respiration of Eucalyptus Plantation with Four Years Old in Beihai of Guangxi, Southern China
Authors: Ma Jiang Ming , Wu Meng , Zhan Ting Ting , Tian Feng , Liang Shi Chu
Published: August 2014

This experiment was conducted on the 4 years old Eucalyptus plantation in Beihai of Guangxi, southern China. From January to December 2013, in the spring, summer, autumn and winter, seasonal variation and diurnal variation of the soil respiration and its environmental factors had been observed, respectively. The results showed that: (1) Soil respirations has obvious seasonal characteristics, the soil respiration rate in each seasons showed that: summer> spring > autumn > winter. The heterotrophic respiration rate was higher than the autotrophic respiration rate. The contribution of autotrophic respiration rate in winter was higher than that in other three seasons. (2) Soil respiration has obvious diurnal characteristic, it could be expressed as a single-peak curve. But the maximum value of soil respiration appeared in different times in different seasons. (3) There existed positive correlation index exponential relationships between the soil temperature and the soil respiration rate and its components. Soil temperature changes could explain soil respiration, autotrophic respiration and heterotrophic respiration by 90.2%, 27.5% and 92.8%. Temperature sensitivity showed following order: the heterotrophic respiration rate> the soil respiration rate> the autotrophic respiration rate, in terms of affected by temperature, the heterotrophic respiration was higher than the autotrophic respiration. (4) There were notable positive correlations between soil moisture content and soil respiration rate. Obviously, soil moisture content could promote soil respiration in a certain range.
Objective Study of Palm Diagnosis of Traditional Chinese Medicine
Authors: Wang Yu Chen , Peng Su Xue , Yan Jian Jun , Wang Yi Qin , Hao Yi Ming , Guo Rui , Liu Guo Ping
Published: August 2014

Palm-print medicine is a discipline in traditional Chinese medicine (TCM), equivalent to thepalm-print diagnosis discipline and palm medicine. And it’s a meaningful work to combine the biometric identification technology with traditional Chinese palm-print medicine for the diagnosis of human diseases. According to the characteristics of palm-print images, this paper makes a simple summary of the key technology and core algorithm in the field of palm-print identification.
Design of a Reconfigurable Mixer for Multi-Mode Multi-Standard Receivers
Authors: Gu Cheng Jie , Fan Xiang Ning , Bao Kuan , Hua Zai Jun
Published: August 2014

This paper reports a reconfigurable wideband passive mixer for direct conversion multimode multi-standard receivers. Different from the traditional current-commutating passive mixers, transconductor stage of this design is variable. And the TIA stage is a second-order low-pass transimpedance amplifiers based on Tow-Thomas biquad topology, working as a current mode filter. The mixer is controlled by a 4-bit control word to realize the flexible gain and variable intermediate frequency bandwidth. Other characteristics such as power consumption, NF, and linearity is also reconfigurable according to different communication standard. Circuit is implementing in 0.18μm CMOS technology. Post-simulation results show that, with the radio frequency ranges from 700 MHz to 2.6 GHz, it provides four voltage conversion gains (10/16/22/28dB) and three-3 dB intermediate frequency bandwidth (5/7.5/10MHz). Under the maximum gain, the double sideband NF of the mixer is 8.4 dB. And under the minimum gain, IIP3 is 13 dBm. The chip occupies an area of 0.248 mm2 and drains a current of 8.5mA from a 1.8 V supply when the mixer has highest gain.
Design of a CMOS Voltage-Controlled Ring Oscillator with Bandgap Voltage Reference
Authors: Xu Chen , Fan Xiang Ning , Hua Zai Jun , Yu Zhou
Published: August 2014

Voltage controlled oscillator has been used in every field of the electronics industry, and plays an indispensable role. In the fractional divider, in order to reduce the product size, voltage controlled ring oscillator is used to meet the design requirements, at the same time as much as possible to reduce the area. The design of wide tuning voltage-controlled ring oscillator was designed with the reference voltage source. This design not only could reduce the error brought by the external voltage reference, and was also very good realization structure innovation in the film. This design used 0.5 μ m CMOS Hua technology. The post simulation results show: when the coarse voltage and fine voltage are respectively 1V and 2V, voltage waveform oscillator output swing is 2.4V; when the coarse voltage and fine voltage are respectively 1.13V and 2V, voltage waveform oscillator output swing is 2.8V; when the coarse voltage and fine voltage are respectively 1.3V and 2V, voltage waveform oscillator output swing is 3V. After simulations, the frequency range of the voltage-controlled ring oscillator adjustment is 100 ~ 200MHz.
The Study on Cointegration of Macro-Economy and Bank Credit Risk
Authors: Gao Qian , Wu Hui Ling , Wu Xian Bin
Published: August 2014

This paper, after excluding the impact of structural factors, studes the relationship between macroeconomic variables and bank credit risk by using the concept of cointegration time series. It finds that the co-integration between time of loans issuance and economic cycle does not exist. The economic cycle has a significant impact to the level of non-performing loans in point, and the co-integration relationship between the two is obvious. Credit scale has a significant long-run equilibrium relationship with economic cycle.
The Research of Enveloping Hourglass Worm Modeling Accuracy Based on CREO
Authors: Chen Shou An , Chen Shang You , Lin Yuan Ping , Luo Dong Dong
Published: August 2014

For hourglass worm three-dimensional modeling, in the Process that Using MATLAB software Calculating the Generated * ·ibl files and leading-in Pro /E software comply hourglass worm three-dimensional modeling, MATLAB Calculate Generated Worm spiral curve, Cusp and Broken line appears, when * ·ibl file mixed border leading-in Pro /E software Worm tooth underside appears Distortion, meshing space appearing inverted triangle and other problems, Propose specific methods to improve hourglass worm modeling precision, and using croe software for modeling. The results show that using this method to the modeling can well improved the hourglass worm modeling accuracy.
Design of a Micro-Nano Positioning Platform Based on Stick-Slip Driving
Authors: Guo Qian Cheng , Liu Shou Bin , Rong Wei Bin
Published: August 2014

Micro-nanopositioning platform is a core component for micro-nanooperation. The static and dynamic characteristics of platform will determine its precision level. This paper presented a new 2-D micro-nanoplatform based on stick-slip driving. By using static structural module and modal analysis module of ANSYS software, the stress and natural frequency of pedestal were analyzed. The driving frequency of piezoelectric ceramic was selected far away from the natural frequency to avoid resonance. Dynamic performance of pedestal was also analyzed with ANSYS transient module. Simulation results show that the presented platform has excellent static and dynamic performance.
Electrospinning Preparation and Properties of Tb(phen)L3/PMMA Rare Earth Luminescent Fibers
Authors: Zhao Fu Lai , Gao Li , Wang Chao Hua , Xi Peng
Published: August 2014

nanomicron fiber of Tb (phen)L3/poly (methyl methacrylate) (PMMA) was successfully prepared by electrospinning using ethyl acetate (EA) and N,N-dimethyl-formamide (DMF) as the solvent. The influence of collector distance, feed rate, applied voltage and the proportion of EA/DMF on the morphology of the as-prepared fibers were discussed. Based on the researched results, the nanomicron fibers with glazed surface and uniform distribution were prepared. The fluorescent spectra indicate that the nanomicron fibers have good fluorescent properties.
A CAPP/CAD for Sheet Metal Deep Drawing
Authors: Abdel-Magied R.K. , Hussein H.M.A.
Published: August 2014

The aim of this work is to develop an integrated system for facilitating the process of designing the drawing dies and their component. The developed system is based on the integration between Computer Aided Process Planning in Sheet Metal Drawn parts “CAPP”, and the Computer Aided Design in Deep Drawing Die components “CAD”. Both modules are coded using Visual Basic program and joined with AutoCAD. The CAPP module made to report the drawing load and to plot the shape of the drawn shell in each stage of the Axis-Symmetric Deep Drawing process. Based on the reported shell geometry, the dimensions of the die components are calculated and transferred to the CAD module. The CAD module, which is based on many data bases (standard parts, sheet metal data), plots the required deep drawing die components for each drawn stage on the AutoCAD monitor. A demonstrated example is presented to validate the developed system and to show that the system results are acceptable.
Heat Transfer Enhancement due to V-Shaped Perforated Blocks in a Solar Air Heater Duct
Authors: Alam Tabish , Saini R.P. , Saini J.S.
Published: August 2014

An experimental study of enhancement of heat transfer due to V-shaped perforated blockages attached to the heated surface has been presented in this paper. The duct equipped with perforated V-blocks had an aspect ratio (W/H) of 12, relative blockage height ratio (e/H) of 0.8, angle of attack (α) of 60° and open area ratio (β) of 20%, while relative pitch ratio (P/e) was varied from 4 to 12. The values of Nusselt number and friction factor of the duct with blockages were compared with values of Nusselt number and friction factor of the smooth duct operating under similar experimental conditions. It was found that there was a significant effect on the Nusselt number ratio and friction factor ratio when the pitch ratio was changed and there was exist an optimum value of pitch ratio. Thermal hydraulic performance was found to be maximum corresponding to relative pitch value of 8.
The Performance of the Interlocking Block Solar Collector
Authors: Jantana Kwanchai , Puangsombut Withaya , Ananacha Thana
Published: August 2014

This paper investigates the thermal performance of the interlocking block solar collector. It consists of the interlocking block wall with horizontal cylindrical hollow and embedded the steel pipes connected in series, the steel pipe outer diameter are 25.4 mm; serves as a collector. The collector having a height of 2.2 m, 1.5 m wide, and thickness of 0.1 m. The results were presented the maximum temperature difference between inlet and outlet air temperatures by about 6°C. The room temperature of interlocking block solar collector is lower than the common interlocking block throughout the day. The efficiency of interlocking block solar collector during the experimental period was about 20%, that is a significantly to reduce heat gain into space room.
Parallel-Connected High Voltage Multiplier with Symmetrical Structure
Authors: Eguchi Kei , Pongswatd Sawai , Terada Shinya , Oota Ichirou
Published: August 2014

A high voltage multiplier is proposed for non-thermal food processing systems utilizing an underwater shockwave. Unlike conventional Cockcroft-Walton Voltage Multiplier (CWVM) providing a DC output from an AC input, the proposed multiplier consists of two switched-capacitor-based DC-DC converters with different polarities. Owing to the symmetrical bipolar structure without magnetic component, the proposed multiplier can achieve faster response speed and lower voltage drop than the conventional CWVM. The theoretical analysis and simulation program with integrated circuit emphasis (SPICE) simulations show the effectiveness of the proposed voltage multiplier.
Dexterity Measures for 4DOF Exoskeleton Robot
Authors: Sutapun Anan , Sangveraphunsiri Viboon
Published: August 2014

In this work, we investigate the measure of isotropy of a manipulator based on its Jacobian matrix. Our manipulator is an exoskeleton arm robot for human physical therapy. An exoskeleton arm robot is wearable robot with joints and links corresponding to those of the human body. Our goal is to derive dexterity measures called the measure of isotropy which can be used for both design and real-time control of a manipulator. Generally, a dexterity measure must be independent of the scale of a manipulator for design and must be expressed analytically so that it can be used for real-time control. Of course, every dexterity measure must bear a physical meaning.
Implementing Expandable Path for an Resizable Cobot
Authors: Jumpaluang Jommutta , Wannasuphoprasit Witaya
Published: August 2014

Collaborative Robots or Cobots are passively assisted devices that are intended to work directly with human operators. We describe a Resizable Cobot that specially designed to expand or retract itself while moving along a specified path. In this paper, we propose and implement a 4-DOF path planning using a path length parameter. The computer simulation using Cobot Kinematic and the experiment result of the Resizable Cobot are provided.
Design and Implementation of Linux-Based Supervisory and Control Configuration Software for Automatic Billet Cut-to-Length System
Authors: Deng Xian Rui , Mu Jing Qin , Du Rui Qing
Published: August 2014

This paper introduced the solution of Linux-based configuration software for billet cut-to-length system. The software had been put up based on the QT platform. At first, according to the application background of billet cut-to-length system, the paper analyzed the function requirements for the software system, and based on it designed the overall frames for the configuration software, then illustrated the details of implementation of the human-computer interface and the real-time database. The configuration software has well stability and has been applied in the real production with good control effects and satisfied the application requirements..
Numerical Analysis for Resistance Calculations of NPL as a Floating Hull for Wave Glider
Authors: Elhadad Aladdin , Duan Wen Yang , Deng Rui , Elhanfey H.
Published: August 2014

Thewave glideris an autonomous unmanned vehicle (AUV) which uses the power of the ocean to propel itself. The purpose of this study is using the well known slender modelNPLin developing hull in an attempt to design the floating hull ofwave glider.CFDandMaxsurfsoftware are used to present a method focused on mesh generation to predictcalm water resistancefor the hull. Calculations are carried out for Froude numbers in the range of 0.10 to 0.40. Three different mesh sizes are used forCFDto calculate the mesh effects. The results of numerical predictions under the same conditions obtained fromCFDandMaxsurfcalculations are obtained and compared for accuracy of the solution parameters. The comparison shows a good agreement between the results. The method is useful and acceptable and the overall numerical scheme is suitable for resistance prediction.
Design of Electronic Seal Terminal for Tank Vehicles
Authors: Yang Yan Fei , Wang Jian , Liu Xue Jian , Yang Xiao Juan , Hu Ya
Published: August 2014

Based on ARM Cortex-M3 processor LM3S2948 as the core of the vehicle terminal and used enhanced 8051 MCU STC12C5A60S2 as the core of the control board of the electronic seal, an electronic seal terminal for tank vehicles is designed. Combined the control board with the vehicle terminal to achieve the tank vehicles ports’ open and close, the communication between control board and vehicle terminal accomplish the control of ports, the 3G network communication between vehicle terminal and the central server accomplish the data’s up and down. This paper, began with the hardware design of electronic seal terminal, put forward the flow chart of the software design of electronic seal terminal, as well as the communication protocol between vehicle terminal and control board and the communication protocol between vehicle terminal and central server.
Research on Recovery Technology of the By-Product Low-Pressure Steam of Ammonia
Authors: Chen Jing , Yin Gui Shu , Xue Yan
Published: August 2014

In this paper, it is described that the design elements and the process of the recovery system for the by-product low-pressure steam of ammonia. And it is introduced the situation of application of this system, including the main equipments selection and control strategy. At last, the economic benefit after application is analyzed.
Spring-Steel Pipe Fiber Bragg Grating Strain Sensor
Authors: Peng Li , Li Chuan , Zhao Zhen Gang , Wu Sheng , Li Ying Na
Published: August 2014

Structure’s strain reflects the stability of the project, the excessive structural strain will destroy the stability of the structure. Fiber Bragg Grating has many features, such as, strong anti-interference ability, low optical loss, and it can be used for a long time in the project, etc. Base on the features, the Fiber Bragg Grating Strain Sensor can be used in slope and other projects for the long-term monitoring. In this paper, we develop a Fiber Bragg Grating Strain Sensor based on the spring-steel pipe, FBG be fixed to the inner of the steel pipe by epoxy glue, it is protected by a stainless steel pipe outside, the Flange be fixed to the both side of the spring-steel pipe. When the tension acting one the flanges, the spring-steel pipe occurs an axial strain, this axial strain makes the center wavelength of the Fiber Bragg Grating change, measuring the wavelength shift amount of the Fiber Bragg Grating can calculate the strain. The loading experiment indicates that the sensitivity of the Spring-steel pipe Fiber Bragg Grating Strain Sensor is 0.81pm/με, the linearity of the sensor is 2.1%FS, and the repeatability error of the sensor is 2.29%FS.
Study on Combined Anti Seepage Characteristics of Upper Reservoir for a Pump Station
Authors: Zhang Bin , Shen Zhen Zhong , Yang Lei , Zhou Yi Qi , Yu Jia Zheng
Published: August 2014

Seepage control is one of the important problems when designing a hydropower station. The upper reservoir of one hydropower station was built by excavation and backfill partly. Its impermeable program is the combination by concrete panel, geomembrane and vertical curtain. With the finite element method , the model of the dam has been built. The potential distribution of groundwater in the library on the seepage filed is analyzed. It also analyzes the seepage slope of dam body, dam foundation and reservoir and calculates the seepage discharge and replenishment at the situation of normal storage level. The results show that potential distribution law of reservoir seepage field is clear and definite. The effect of cutting water head by anti-seepage curtain and curtain downstream under protective layer at the bottom of the coarse sand and back packing drainage is remarkable. The panel and geomembrane have an effect on cutting waterhead. The seepage flow of upper reservoir is 488.16m3/d and the supply flow is 1019.52m3/d. So the control scheme of the upstream seepage is reasonable technically.
Effect of Gear Installation Flatness in Main Reducer on Gear Mesh Vibration Based on Adams Simulation
Authors: Xu Jin Li , Yan Ting
Published: August 2014

This paper takes spiral bevel gear installation planes of a main reducer in a rear axle of a certain car as the research object, using ug to establish three-dimensional model of the main reducer assembly, applies adams simulation and the quantitative and qualitative method to analyze the effect law of the spiral bevel gear installation flatness error on gear mesh vibration, obtains the reasonable area of gear installation flatness error , it provides the reference for parameter design and installation of the spiral bevel gear in the main reducer.
Improving Tribological Behavior of 2-Stroke Marine Diesel Engine Piston Ring by Cylinder Liner Surface Texturing
Authors: Mohamad Salaheldin A. , Zheng Qun , Lu Xi Qun
Published: August 2014

Piston ring lubrication in some types of low-speed 2-stroke marine diesel engines is completely different from those in medium-or high-speed diesel engines since the inner surface of cylinder liners are textured with circular grooves in macro-scale and honing texture in micro-scale. In this paper, a numerical model has been developed to study the potential of use of cylinder bore surface texturing, in the form of circumferential oil grooves with different dimensions and densities, and their efficiency to improve the tribological properties of piston ring-cylinder liner tribo-system. The average Reynolds equation has been employed in the area of micro-scale texture and the effect of macro-scale grooves has been incorporated to improve the currently lubrication model. The results showed that the cylinder liner oil grooves can efficiently be used to maintain hydrodynamic effect. It is also shown that optimum surface texturing may substantially reduce the friction losses between piston ring and cylinder liner.
Intelligent Synchronous Control for Gantry Position Stage
Authors: Chou Po Huan , Lin Faa Jeng , Chen Wen Chuan , Chen Ying Min
Published: August 2014

A cross-coupled proportional-integral-derivative neural network (PIDNN) control is proposed in this study for the synchronous control of a dual linear motors servo system which is installed in a gantry position stage. First, the dynamics of the field-oriented control PMLSM servo drive with a lumped uncertainty, which contains parameter variations, external disturbance and friction force, is introduced. Then, to achieve accurate trajectory tracking performance with robustness, an intelligent control approach using PIDNN is proposed for the field-oriented control PMLSM servo drive system. In the proposed approach, the on-line learning algorithms of the PIDNN are derived using back-propagation (BP) method to guarantee the convergence of the network. Finally, some experimental results are illustrated to depict the validity of the proposed control approach.
Analysis of Elastic Motion Stability of Flexible Manipulator Arm Based on Roth Criterion of Control System
Authors: Liu Guang Rui , Niu Lan Fen , Tian Xin
Published: August 2014

In order to study the elastic motion stability of flexible manipulator arm , to analyze the effect of the end position addition mass and rotary inertia on the elastic motion stability ,and to compute the maximum dynamic allowable payload , the physics model of a flexible manipulator arm is established , the differential equation of elastic motion of the flexible manipulator arm is solved using the method of the separation of time and space and the method of Laplace transformation , the dynamic model of flexible manipulator arm carried addition mass on its end position is established ,simplified and truncated using Lagrange equation . the state space expression and transfer function are established with the state variable and control input and output variable designated , the elastic motion stability rule is built upon and simplified using Roth criterion . The influence of the end position addition mass and articulation rotational inertia of flexible manipulator arm on its elastic motion stability is analyzed using the stability rule and the dynamic maximum allowable payload of flexible manipulator arm on its end position is computed in order to guarantee its elastic motion stability .
Kinematics Model of the 6-DOF Underwater Manipulator and Control System Design Based on PLC Technology
Authors: Yao Tao , Chang Zong Yu
Published: August 2014

The paper introduces kinematics analysis for a kind of 6 degrees of freedom underwater manipulator. Firstly, kinematics model was established based on D-H principle; The solving process of kinematics direct solution and inverse solution of manipulator was presented. Secondly, Numerical simulation is performed based on ADAMS software, every joint speed and acceleration curve is obtained. The working principals and control requirement of underwater manipulator are illustrated; Based on kinematics modeling, the control system of manipulator was designed based on PLC and carried out the control the function of the manipulator.
Prediction of the Development of Non-Equilibrium Turbulent Boundary Layers Based on Modified Log-Wake Law
Authors: Zhang Tao , Zhu Xiao Jun , Peng Fei , Min Shao Song
Published: August 2014

The properties of non-equilibrium turbulent boundary layers are substantially more complicated than that of equilibrium ones, and current understanding and predictive capabilities of the former are less well developed than of the latter. This paper proposed a nonlinear dynamical system approach to predict streamwise development of non-equilibrium turbulent boundary layers by means of realizing the closure of the momentum integral equation with aid of the modified log-wake law and the entrainment equation. The example calculation showed the results were in reasonable agreement with the experiment data, and demonstrated the proposed method could predict the streamwise evolution of the layers accurately and simply. Moreover, the method would be conveniently extended to the flows over rough surfaces.
The Influence and Application of Stainless Steel to Modern Sculpture
Authors: Zhang Qi , Wang Shi Yng
Published: August 2014

Understand the impact of new materials on the study of modern sculpture, stainless steel sculpture and its understanding, awareness and stainless steel sculpture to the current problems that exist through observation, induction and summary, stainless steel sculpture by recognizing the problems at the same time, given a reasonable solution. Such as the use of welding techniques, and how to be colored stainless steel polishing process.
A New Type of Underwater Salvage Dilator with Seawater Hydraulic Drive
Authors: He Fa Ming , Qiu Li Qiang , Yu Feng Wei
Published: August 2014

Marine salvage is a key link to ensure the safety of maritime shipping. Hydraulic dilator is one of the emergency tools which are widely used in rescue. The traditional hydraulic dilators with mineral oil drive or electric dilators can hardly achieve satisfactory results in underwater salvage environment. A kind of underwater salvage dilator with seawater hydraulic drive is designed. Its main functions, structure and the calculation methods of main parameters are introduced.
Study on the Effect of Humic Acid Acetamide on the Rheological Properties of Diesel Oil-Based Drilling Fluids
Authors: Ma Cha , Li Long , Lu Hu , Yuan Xu Bo , Wang Gang
Published: August 2014

A new kind of humic acid acetamide compoud was synthesized by chemical modification of humic acid with octadecylamine, and the effect of humic acid acetamide on the rheological properties of oil-based drilling fluids was investigated. The results indicated that the humic acid acetamide had excellent dispersing property, and good capacity of depressing fluid loss. Moreover, the humic acid acetamide had better property of depressing fluid loss than oxidated asphalt. As a result, this humic acid acetamide is an excellent fluid loss agent for diesel oil-based drilling fluids, and is an good alternative to oxidated asphalt.
A Study on the Electrical Properties of Gan-Based Alpha Particle Detector
Authors: Zhu Zhi Fu , Peng Xin Cun , Zou Ji Jun , Feng Lin , Wang Ren Bo
Published: August 2014

Pin structure GaN-based alpha particle detector with epitaxial growth on c-plane sapphire substrate through metal organic chemical vapor deposition (MOCVD) method, uses electron beam evaporation and photoetching machine to produce the ohmic contact electrodes of device. The electrical properties of device which were tested by I-V and C-V show that the device’s reverse leakage current is 9.9μA at 100V reverse bias voltage is at; and the detector’s junction capacitance is 19pF at 20V reverse bias voltage.
Thermo-Physical Properties of Magnetic Fluid and its Natural Convection Heat Transfer in a Horizontal Enclosed Rectangular Container
Authors: Li Yan Rong , Inagaki Terumi , Saito Hikaru , Abe Masashi
Published: August 2014

Thermo-physical properties of magnetic fluid were measured experimentally at various temperatures, in order to evaluate their temperature dependencies. Heat transfer by natural convection was also investigated in a horizontal enclosed rectangular container filled with the tested magnetic fluid. It was found that the heat transfer coefficient of the magnetic fluid keeps good agreement with the conventional heat-transfer correlation of natural convection heat transfer in a horizontal enclosed rectangular container by applying the values of thermo-physical properties obtained in the present work. Therefore, the measured thermo-physical properties are reliable and can be used as a thermo-physical database of the magnetic fluid.
Singular Configurations Analysis of a Redundantly Actuated Parallel Manipulator
Authors: Gong Jin Liang , Pang Jin Xiang , Zhang Yanfei
Published: August 2014

The singular configurations of a type of redundantly actuated parallel manipulator are studied in view of manipulability. Considering the non-square characteristics of Jacobian matrix of redundant input parallel machine, Laplace Theorem and its correlative theorems in Matrices Theory are introduced to avoid the problem that there is no determinant for non-square matrix. Singularity configuration distribution characteristics of this redundant input parallel machine are also depicted for different surfaces and orientations. These results provide pivotal foundations for its valid workspace selection.
Different Approaches to Numerical Simulations of Prestressed Concrete Structural Elements
Authors: Hokes Filip
Published: August 2014

The topic of this paper is the description of different approaches to numerical simulation of prestressed concrete in computational system ANSYS 14.5. Due to increasing popularity of the numerical simulations, the paper aims to divide and describe simple methods and related aspects of modeling prestress on the finite element level. The paper contains three main part: the analytical solution, the numerical solution and the final comparison of the results. The obtained numerical results proved applicability of FEA for solving problems of prestressed concrete elements.
Properties of Lime Plasters with Different Ceramic Powder Dosage
Authors: Čáchová Monika , Koňáková Dana , Vejmelková Eva , Reiterman Pavel , Keppert Martin , Černý Robert
Published: August 2014

Several lime-based plasters with fine ground brick content are studied in this article. In the first plaster the ceramics was used as lime substitute while in the second one it was dosed as replacement of the silica sand, the substitution levels being 20% and 50%. Pure lime plaster was use as a reference. Experimental methods and results of measuring basic physical properties, pore characterization, mechanical properties and liquid water transport are described. The plasters with fine ground brick were characterized by improved material’s properties in a comparison with pure lime plaster.
Optimization of Injection Moulding Process from the View of Cavity Filling Time and Product Cooling Time
Authors: Monkova Katarina , Hric Slavomir
Published: August 2014

The article deals with the mould cooling system design. The goal of design presented in the article was to propose the mould form so to be achieved the shortest time for both mould filling and product cooling. Studied product is intended to serve as a stopper in the automotive spotlight. After filling of mould cavity, the melt has to cool at 100 ° C, only then it is possible to accede to the next phase, which is final pressure. So the cooling and filling time is directly proportional to the reduction of production cost. 3D model of the mould was created in Autodesk Inventor Proffesional software and then solidification of material was simulated in Autodesk Moldflow Insight software. There were considered four types of cooling system in the article and the best one from the view of time was manufactured and placed into the injection moulding machine Arburg Allrounder 320 C.
The Influence of Gamma Radiation on Magnetic Properties of Fe3O4, Co0.8Ni0.2Fe2O4, Co0.8Zn0.2Fe2O4 Ferrite Magnetic Materials
Authors: Thu Nguyen Thi Ai , Giao Nguyen Mong
Published: August 2014

The influence of radiation on magnetic material has been investigated in many researches which had proved that the magnetic properties of hard magnetic were unchangeable under radiation effect[1],[2],[3],[4],[5],[6].In this work, we performed the study of the influence of gamma radiation on Fe3O4, Co0.8Ni0.2Fe2O4, Co0.8Zn0.2Fe2O4. The60Co gamma radiation was emitted on ferrite magnetic materials with doses 1000, 1500, 2000 kGy. Analyzing magnetic properties of the materials before and after emitting by Walker Automatic Hysteresisgraphs AMH 20-50. The change of (B-H) loop is insignificant. Our work agrees well with the result of[1][2][3][4].
Estimation of Maximum Fatigue Loads and Bearing Life in Ball Bearings Using Multi-Axial High-Cycle Fatigue Criterion
Authors: Romanowicz Paweł , Szybiński Bogdan
Published: August 2014

The methodology of the fatigue load and the bearing life estimation for the ball bearings is presented in the paper. The proposed algorithm is based on the elliptical contact solution and the application of the multi-axial high-cycle fatigue criterion. As the example the radial 6204* and thrust 51104 ball bearings are investigated (SKF). The maximal fatigue loadings are calculated for different geometry (race conformity ratio) and the bearing life of the bearings. The proposed model is also verified with use of the finite element calculations.
Material Study of a Short Seismic Link in a Dissipative Structure of a Vertical Industrial Boiler
Authors: Protivínský Jiri , Krejsa Martin
Published: August 2014

Submitted paper presents brief information about structural dissipative design of a power plant boiler structure. The main attention is paid to the selection of material solution. Several material combinations of materials for dissipative members and other structural elements have been evaluated. As a measure of material combination effectiveness has been chosen a ratio between structural stiffness of primary and secondary lateral load resisting system. Probabilistic analysis of the structural sub-section has been carried-out for the most common material combination with steel S235 used for seismic links. Probabilistic analysis has been performed for the evaluation of the risk of material hardening in links and probabilistic distribution of material properties.