bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Special Energy Aggregation Structure with Fractal Characteristics
Authors: Luo Jin Hong , Liu Hui
Published: January 2015

A kind of special energy aggregation structure is analyzed. The special structure can gather electromagnetic energy. The paper summarizes features of the structure and indicates that the structure is a fractal. By analyzing the fractal characteristics, deduces the math iterative that can produce the parameter matrix of the structure. Mathematical model is done for this special energy aggregation structure. A special energy aggregation structure is designed by the mathematical model. The experimental results proved that the sample has functions of gathering electromagnetic energy. The results prove that the mathematical model for the special energy aggregation structure is built correctly and effectively. The paper provides the basis of mathematical analysis for researching on energy aggregation and transmission mechanism of this structure.
Optimal Modified Tracking Performance of Linear Single-Input Multiple-Output Control Systems
Authors: Wang Bao Xian , Guan Zhi Hong , Wang Hou Neng
Published: January 2015

In this paper, the optimal modified performance of the single-input multiple-output (SIMO) linear time-invariant (LTI) systems is investigated. The performance bound is related to the scaled factor, the inner factor of the plant and the spectral density of the reference signal. The output dimension also plays an important role. The strong restrictions of the directions for the reference signal and the assumption that the plant must have an integrator in the existing conclusions are not necessary. Also the modified performance index overcomes the invalidity when the state error is not zero vectors.
Performance Analysis of Controller Design for DC-DC Buck Converter Using Linear and Non Linear Technique
Authors: Ali Husan , Zheng Xian Cheng , Khan Shahbaz , Abbas Waseem , Awan Dawar
Published: January 2015

The switched mode dc-dc converters are some of the most widely used power electronics circuits because of high conversion efficiency and flexible output voltage. Many methods have been developed for the control of dc-dc converters. This paper deals with design of controller for dc-dc buck converter using various control techniques. The first two control techniques are based on classical or linear control methods i.e. PI and PID control, while the other two control technique are based on non linear control method i.e. Sliding Mode Control (SMC) and Sliding Mode Proportional Integral Derivative Control (SMC-PID). The output voltage and the inductor current of the applied control techniques are analyzed and compared in transient and steady state region. Also the robustness of the buck converter system is tested for load changes and input voltage variations. Matlab/Simulink is used for the simulations. The detailed simulation results are presented, which compare the performance of the designed controllers for various cases. The results show that the non linear control for DC/DC Buck converter proves to be more robust than linear control especially when dynamic tests are applied.
Theoretical and Spectroscopic Studies of N-([4-aminophenyl]ethynyltoluene)-N’-(1-naphthanoyl thiourea (ATT) as Carbon Monoxide Gas Chemosensor
Authors: Khairul Wan M. , Daud Adibah Izzati , Mohamed Zuki Hafiza , Kubulat K.
Published: January 2015

Acetylide and thiourea moieties individually provides a wide range of electronic properties as they possess electronic delocalization in extended rigid π orbital system in their designated structures. In this work, a new derivative of N-([4–aminophenyl] ethynyltoluene)-N’-(1-naphthanoyl) thiourea (ATT) was successfully synthesized and spectroscopically characterized by using FT-IR, NMR, and UV-Vis analysis. In turn, the development of new sensing material thin-film based on ATT has been accomplished by incorporating with polyvinyl chloride (PVC) via dip-coating technique. The difference in absorption behavior using UV-visible spectroscopic analysis was employed to determine the sensitivity of thin-film towards carbon monoxide (CO) gas of 10, 20, and 30 ppm. ATT exhibits high sensitivity towards 30 ppm CO gas with 55% sensitivity. Quantum mechanical calculation via Gaussian 09 shows that ATT has potential van der Waals interaction towards CO with stabilization energy-6.54 kJ/mol and 3.14Ǻ of interaction distance between substrate and analyte. It is proven that ATT as single molecule gives great potential to be explored and used as sensing material application particularly in CO detection.
Building a Decision Tree Model for Campus Information Score Based on the Algorithm C5.0
Authors: Ran Cong Lin , Wang Xiao Jing
Published: January 2015

Network technology accelerates the development of educational information, campus portal building is considered as an important part of it in every university, almost all information of teaching and research appeared on the web. Meanwhile, the utilization rate of some websites was lower in university, information was updated slowly, information classifications were complex and not standardized on a platform. They didn’t emphasis on using and sharing but building and developing, and this phenomenon was widespread. So the paper proposed a decision tree model for score sorting information based on C5.0 algorithm, setting up a statistical model for data mining by adding a line weight value for portal information. Finally, the results verify the correctness and science of the model by giving an example.
A Stratified Monitoring Model for Hybrid Cloud
Authors: Liu Yun Chang , Li Chun Lin
Published: January 2015

Hybrid clouds integrate different cloud solutions. Its inherent complexity and short of standard urge for a careful analysis, systematizing and understanding of monitoring. In this context, this paper provides a deep insight into hybrid cloud monitoring. It proposes a layered monitoring model for hybrid clouds, identifying the multiple layers of monitoring, focusing on physical infrastructure layer, virtual infrastructure layer, network, application/service layer, while combining the perspectives of service providers and clients. This process involves the identification of relevant parameters and metrics for each layer. Due to its flexibiliity and intelligence, using Agent technology, an agent-based monitoring architecture is presented. It enables to eliminate the complexity among different cloud platforms.This study contributes to achieve a clearer and more efficient approach to hybrid cloud monitoring.
The Comparison and Analysis of SEMG in Upper Limb Movement between Hemiplegic Patients and Healthy People
Authors: Zhang Teng Yu , Tao Chun Jing
Published: January 2015

In this paper, the surface electromyogram (EMG) signal of the hemiplegic patients and healthy people were collected when completing upper limb movements, then the general EMG characteristic rules of healthy people in common action were analyzed, and the EMG characteristics of hemiplegic patients in time and frequency domain were extracted. By comparing and analyzing the EMG characteristics between the hemiplegic patients and healthy people, the results showed that the order and magnitude of muscle contraction of hemiplegic patients were not comply with the general laws of healthy people, which resulted in disorganized movement.
Experimental Investigation of Solid Attitude Control System Using Proportional Pintle Thrusters
Authors: Chang Heng , Wang Yi Bai , Liu Yu , Wu Jin Qing
Published: January 2015

In order to investigate the characteristics of solid attitude control system (SACS) using proportional pintle thrusters, an ACS comprised of dual collaborative thrusters was designed and studied by theory and cold-flow test. Experiments were conducted to ascertain thrust variation at different pintle locations. With the purpose of studying thrust control principle, the thrust, chamber pressure and pintle displacement of two thrusters were measured, which worked differentially in the process. Results show that a nearly linear relationship is found between the thrust and valve pintle position and the two thrusters can work synchronous to produce a resultant force, whose direction and value can vary continuously. Besides, collaborative work mode of dual thrusters is conducive to the stabilization of chamber pressure which is beneficial to the choice of propellant.
The Influence of Characterization of Metallic Gasket Rough Surface on Gas Sealing Performance in Seal Structure
Authors: Yang Wen Jian , Huang Xiao Ming , Xu Guo Liang , Lv Xiang Kui
Published: January 2015

To investigate the influence of the roughness characteristics of the metallic gasket on the gas leakage rate, a mathematical model of a rough surface based on the Gauss distribution function and exponential auto-correlation function was built. According to this model, a 3D geometrical model of a sealing clearance with two rough surfaces was configured. Effect of the roughness parameters on the gas sealing performance was numerical analyzed, and through the comparison with the classical smooth parallel plate leakage model, the relationship between the leakage rate and the roughness parameters of the sealing surfaces was built. Furthermore, the relationship between contact pressure and the leakage rate for the different roughness surfaces was studied based on the current model. The results show the methodology proposed in current work is effective in predicting the actual sealing performance of static seal structure.
A Coupling Difference Scheme of Thermo-Hydro-Mechanical Model on Unsaturated Porous Media
Authors: Lu Hong Zhi , Liu Tang Wei
Published: January 2015

The main innovation of this paper includes two parts. One part is the discrete formulas of Thermo-hydro-mechanical (THM) coupling equations and another part is the discussion of the truncation errors based on the Taylor formula. There are many THM coupling problems in unsaturated soils, which are very important in both theoretical and engineering applications. The numerical computing of coupling equations is increasingly important. Considering the deformation of unsaturated soils skeleton, fluid flow and heat transfer, constitutive relationships of the THM coupled behavior are given. Then, the constitutive equations are derived and a closed problem is formed. The equations are dispersed by difference method and the truncation errors of the discrete formulas are given.
Dynamical Equations of Flexible Multibody Systems under Lie Group Framework
Authors: Yu Wen Jie , Pan Zhen Kuan
Published: January 2015

A new type of dynamic equations of flexible multibody systems is derived via virtual work principle together with floating frame approach. The absolute Cartesian coordinates are used to describe positions of floating frames’ origins of deformable bodies; The orientation transform matrices as special orthogonal groups are used to describe rotation motions; The modal coordinates are used to express small deflections of deformable bodies with respect to the corresponding floating frames. The resulting equations are mixed classic Euler-Lagrange equations of translational motion of bodies and deformation and Euler-Poinaré equations of rotation in Lie groups and Lie algebras, the Lie-Poisson equations as reconstruction equations obtaining Lie Groups from Lie algebras, constraint equations Lie groups and Lie algebras. In order to simplify the implementation, we separate the constant coefficient matrices in generalized mass matrices and generalized forces in detail. The results can be easily used to design geometric integrators of Lie group structure preserving.
Research on the Law of Propagation and Attenuation of the Explosive Stress Wave in Surrounding Rocks at Different Levels
Authors: Ye Yong , Liu Shan Qi
Published: January 2015

By using nonlinear finite element analysis software-ANSYS/LS-DYNA, a numerical model was carried out to simulate the explosive stress wave generated from a single-hole coupling continuous charge blasting which varies with time at different levels of rock. Meanwhile, the propagation and attenuation law of the explosive stress wave at different rock levels was analyzed to gain an in-depth knowledge of rock explosion. The result shows that the explosive stress wave in rock is in the trend of exponential decay and presents three forms: shock wave, stess wave and seismic wave. It illustrates that numerical simulation can objectively reflect the failure law of rock blasting and provide theoretical and technical guidance for the corresponding practical engineering.
Effect of Steel Fiber on Comprehensive Performance of Concrete Materials
Authors: Dong Liang Feng , Zhang Shi Ping
Published: January 2015

This paper presents the results on the influence of steel fiber on the performance of concrete materials. The performance of steel fiber reinforced concrete was studied through mechanical testing, frost resistance, carbonation and impermeability testing. Experimental results showed that steel fibers can improve compressive and flexural strengths, and especially can significantly improve flexural strength. Frost resistance can also be improved, and the higher the volume of steel fibers added, the more the freeze-thaw cycles that concrete could resist. Furthermore, steel fiber can not only slow down the carbonation rate indirectly, but also improve the impermeability of concrete, and impermeability enhanced with the increase of steel fiber.
Selective Oxidation of Methane to Methanol with Organic Oxidants Catalyzed by Iodine in Non-Aqueous Acetic Acid Medium
Authors: Xiao Yong Shan , Chen Li Yu , Lu Run Xia , Tang Cheng Qian
Published: January 2015

Various organic oxidants including tert-butyl peroxybenzoate, tert-butyl hydroperioxide (TBHP), hydrogen peroxide-urea adduct, dicumyl peroxyide and peracetic acid solution were studied for the oxidation of methane to methanol via methyl acetate catalyzed by iodine in non-aqueous acetic acid medium. Among these organic oxidants investigated, tert-butyl hydroperioxide (TBHP) exhibited the highest methane conversion. The effects of various kinetic factors on the catalytic behavior of the TBHP-I2 system were investigated, and a quantitative yield of methyl acetate (18.9%) based on methane has been obtained under the optimized conditions. A possible mechanism involving electrophilic displacement has been suggested for this reaction.
Foliar Application of Abscisic Acid and Sulfonamide Compounds Induced Drought Tolerance in Watermelon
Authors: Cheng Wei Shun , Zeng Dan Li , Zhang Na , Zeng Hong Xia , Shi Xian Feng , Li Yu Hua , Sun Yu Hong
Published: January 2015

The effects of exogenous abscisic acid and two sulfonamide compounds: Sulfacetamide and Sulfasalazine were studied on tolerance of watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai var. lanatus] under drought stress and compared with abscisic acid effects. Eight-week old plants were treated with ABA (10 and 25 mg/L), Sulfacetamide (25, 50 and 100 mg/L) and Sulfasalazine (25,50 and 100 mg/L). Solutions were sprayed daily and sampling was done at 0 h, 48 h, 96 h, 144 h and 48 h after re-watering (recovery phase or 192 h). Treated plants showed relatively greater drought tolerance. This indicates that, Sulfacetamide and Sulfasalazine may improve resistance in watermelon, like ABA, increasing levels of proline, glycine betaine and malondialdehyde and the activity of ascorbate peroxidase. Daily application of Sulfasalazine and Sulfacetamide during drought stress period was effective in increasing watermelon plants tolerance to drought as was ABA.
Study on the Property of Clinched Joint in Similar-Dissimilar Sheets about Titanium Alloy
Authors: Zhang Yue , He Xiao Cong , Liu Fu Long
Published: January 2015

In order to analysis the mechanical properties of clinched joints of titanium alloy, three types of the clinched joints in similar and dissimilar sheets called , TA1-TA1,TA1-H62 and Al5052-TA1 were respectively studied through the method of experiment. Tensile shear tests were carried out to examine the mechanical behavior of them, the failure modes also been analysised. It can be seen in the experiment that the failure mode of the three kinds of joints were fracture of upper sheet at the neck with the minimum thickness. Comparison shows that improve the plasticity of the lower sheet can improve the quality of joint when the upper sheet was titanium alloy sheet.
Effects of Grain Refinement on the Prevention of Edge Cracking during Hot Rolling of AZ31 Magnesium Alloy
Authors: Chen Li Juan , Jing Qing Lin , Li Hui
Published: January 2015

The effect of carbon addition on the hot rolling behavior of as-cast AZ31 alloy was investigated. It is found that the carbon addition can refine the as cast grain size of the AZ31 alloy to 140μm. The edge cracking occurrence on the surface during hot-rolling of the AZ31 alloy was practically eliminated by the grain refinement. Based on the microstructure examination during the hot rolling, the improvement in rollability of the carbon added AZ31 alloy is attributed to the more homogeneous DRX process during hot rolling, which can distribute and effectively absorb strain energy and prohibit crack growth.
Static and Dynamic Comparative Study on the Cardanic Transmission
Authors: Avrigean Eugen
Published: January 2015

This paper aims to make a comparative study between the static and the dynamic analysis in the cardanic transmission. The cardanic transmission is done at full scale and is charged as it is in practice, by means of the Solidworks and Cosmos programs. We observe the differences and the tension areas which appear in the cardanic transmission elements and present the findings and the given solutions, according to the study.
Optimization of Seepage Prevention Form of the Zhen’an Pumped Storage Power Station
Authors: Shen Zhen Zhong , Zhang Li , Xu Li Qun
Published: January 2015

The main dam of the upper reservoir of Zhen'an pumped storage power station in Shaanxi Province, China, is a concrete face rockfill dam with height of 125.90m and crest length of 363.00m. The in-situ drilling and geological prospecting show that the groundwater level is higher than the normal water level in part of the left bank and the reservoir tail, leading to the reversed seepage problem of the groundwater through concrete slab under drawdown condition. Based on the establishment and calculation of the three-dimentional finite element seepage model, the analysis and comparison was made between the overall seepage prevention composed of concrete slab + composite geomembrane and the partial seepage prevention composed of concrete slab + composite geomembrane + vertical grouting curtain [1,2]. The result was found that the seepage gradient requirement was met up by both forms, but due to the prevention of supply from the groundwater in the left bank and reservoir tail, the uplift pressure was formed locally in the overall seepage prevention, whereas such problem did not exist in the partial form. With the extra water supply from the groundwater, the partial seepage prevention works better in terms of leakage. Besides, the design of coarse sand drainage layer is well-served in reducing the water pressure beneath the composite geomembrane on the bottom of the reservoir [3]. It is suggested that the high groundwater should be fully utilized for security and economic benefit. The achievement and experience of this partial seepage prevention design should be taken into consideration for other similar projects.
Study on Tower Vibration Characteristic of 3-Rotor HAWT System
Authors: Lu Lin Ping , Wang Yi Ping , Huang Qun Wu
Published: January 2015

Multi-Rotor Horizontal Axis Wind Turbine (MR-HAWT) system with three 2kW Horizontal Axis Wind Turbines (HAWTs) is the research object. After some appropriate simplifications, the finite element model is established and verified by experiments. The vibration characteristic of the tower under rotors’ periodic excitations is studied through transient analysis method and compared with 6kW single-rotor HAWT system. The result shows that the maximum stress of the 3-Rotor Horizontal Axis Wind Turbine (3R-HAWT) system is less than the single-rotor HAWT, so the safety of the 3R-HAWT system is superior to the single-rotor HAWT system.
A Instantaneous Availability Modelling Method for Repairable System
Authors: Kong De Zhi , Li Xiao Bing
Published: January 2015

A Instantaneous availability modelling method for repair system was introduced. The empirical modeling method was used to the reliability function, and the life distribution selection method was proposed. Then, under the assumption that the maintainability was decreasing with the calendar time, the Fourier function was chosen for the basic fitting functions. Under the original definition of availability for the system, the availability modeling method was proposed. Finally, a case example for the method was given, and the result showed that the method was convenient for availability evaluation.
Hydro-Oleophobic Property of Butterfly Wing Surface and Biomimetic Fabrication of Hydrophobic Silver Film
Authors: Sun Gang , Fang Yan
Published: January 2015

The hydrophobicity and oleophobicity(methanol repellency) of butterfly wing surfaces were measured by a video-basedcontact angle (CA) meter. The multi-dimensional microstructure of the wingsurfaces was characterized by a scanning electron microscope (SEM) and an atomic force microscope (AFM). The wingsurface exhibits superhydrophobicity (water CA 150.4~159.2°) and low adhesion (water sliding angle 1~3°). Meanwhile, the wingsurface displays high repellency against methanol. The critical concentrationsfor wetting and spreading-wetting of methanol solution on the wing surface are60% and 80%, respectively. The butterfly wing surface is ofhydro-oleophobicity. The wing surface possessescomplicated hierarchicalmicrostructures. Using the butterfly wing as a bio-template, the hydrophobicsilver films were prepared. Water CA increases from metal silver’s intrinsicCA 63.0° maximally to 139.2° (Speyeria aglaja, 5 nm silver film). The microstructures on thewing surface result in the transition of metal silver from hydrophilic tohydrophobic. The butterfly wing can be used as a template for design of smartinterface and functional surface.
Effect of Thermal Aging on Mechanical Properties of EPDM Rubber
Authors: Liu Jie , Zhang Lun Wu , Wang Bin , Xu Ze Qi , Wang Wan
Published: January 2015

EPDM rubber was exposed to an accelerated thermal aging environment produced by an air-circulating oven. The changes of morphology, mechanical properties of EPDM were monitored by scanning electron microscope (SEM), tensile/compressive testing. Crosslink density of EPDM was measured by the solvent swell method. The results showed that many cracks and voids appeared on the surface of EPDM with the exposure time. The aging process proceeded predominantly via crosslinking. The tensile strength increased with increase in crosslink density up to a maximum and thereafter decreased with further increase in crosslink density.
Study on the Anti-Stripping Properties of Dry Rubber Modified Asphalt Mixture
Authors: Peng Bo , Li Wen Ying , Gong Wei , Yin Guang Kai
Published: January 2015

In the engineering practice dry rubber modified asphalt mixture is easy to strip due to the poor adhesion between the rubber particles and asphalt. This paper describes a case study where the rubber-modified asphalt mixture mixed with hydrated lime, cement to improve the adhesion between the asphalt and rubber particles, and improve the road performance of the mixture. Then the additive dosage was determined through laboratory experiment and the pavement performance was verified. The result showed that: the water stability and high temperature stability could be evidently improved with the asphalt mixture added with these anti-stripping agents. And asphalt mixture with 1.5% hydrated lime had the best anti-stripping performance.
Preparation and Pavement Performance of Colored Asphalt
Authors: Tang Xin De , Kong Chao , Tian Jiang , Li Ying , Jin Zheng Tong , Bai Hui Yang
Published: January 2015

Colored binder was prepared by mixing aromatic oil with petroleum resin and functional polymers. Then the colored binder combined with pigment, aggregates, and additives resulted in colored asphalt mixture. Futher modification by nano-montmorillonite or coupling agent, higher pavement performance was chieved. The paving technical indexes of the mixture such as physical properties, moisture susceptibility, and high temperature stability were tested. The results demonstrate that the high temperature stability and moisture susceptibility can be satisfied with the requirements of hardscape projects including asphalt driveways, asphalt walkways, asphalt streets, asphalt bike paths, and asphalt walking paths.
The Preparation of NiO/BiVO4 Composite Photocatalyst and its Enhanced Photocatalytic Activities
Authors: Yi Pei Pei , Zhai Xiang , Gao Xiao Ming , Fu Feng
Published: January 2015

The NiO/BiVO4 composite photocatalysts were synthesized by hydrothermal method and were characterized by powder X-ray diffraction(XRD),scanning electron microscope (SEM), UV-vis diffuse reflectance spectrum(UV-vis DRS), Energy Dispersive Spectrometer (EDS), BET techniques. The photocatalytic activities were determined by oxidative decomposition of methyl orange in aqueous solution under visible light irradiation. The results showed that the light absorption of the NiO/BiVO4 became higher in the visible range compared to pure BiVO4, meantime, accompanied by a bathochromic shift of the absorption edge. The photocatalytic activities were evaluated by the photodegradation of Methyl Orange under visible light irradiation. The results showed that NiO loaded evidently improved the photocatalytic activity of BiVO4, and loaded amount had a different impact on the catalytic activity of BiVO4, The 20%NiO/BiVO4 which exhibited the favorable photocatalytic activity in the photodegradation of Methyl Orange.
Electrochemical Preparation and Application of PEDOT/Ferrocene Modified Electrode
Authors: Zhou Xin Fei , Song Yan Hui , He Kun Yun , Zheng Hai Tao , Suye Shinichiro
Published: January 2015

A highly stable and sensitive electrochemical sensor was developed by electropolymerisation of poly (3, 4-ethylenedioxythiophene) (PEDOT) and ferrocene (Fc) on gold electrode for the determination of ascorbic acid (AA). The PEDOT/Fc composite film modified Au electrode was characterized by field emission scanning electron microscope，electrochemical impedance spectroscopy and cyclic voltammetry. Compared with bare electrode, the PEDOT/Fc modified electrode exhibited excellent electrocatalytic activity toward the oxidation of AA.
Automotive Wire Control Steering Sensor Fault Detection Algorithm Research
Authors: Liu Zhi Ping
Published: January 2015

This article to cancel after the mechanical connections between steering wheel and steering, wire control steering system security and reliability problems, put forward on the basis of the analytical redundancy software sensor method of wire control steering system. In order to solve the compared with the traditional steering system in terms of reliability and safety of the problems of structural changes, the wire control steering system of the main sensor fault diagnosis methods are studied. In wire control steering system associated with the vehicle dynamics model is established under the premise of hypothesis testing to double adaptive fading Kalman filtering technology as a platform, combined with according to the working state of each sensors to determine fault feature vector, to build the main sensor wire control steering automobile fault diagnosis method of residual error threshold. For fault diagnosis of automobile EPS sensor, the BP neural network is put forward to EPS sensor for auto are introduced in the fault diagnosis. For large-scale wireless sensor networks (WSN), reduce the fault detection accuracy, and larger load of communication problems, according to the spatial and temporal correlation characteristics of sensor nodes, proposes a distributed sensor fault detection algorithm based on cluster. These algorithms for sensor fault detection is of great significance.
Material Properties in Advances in Organic Fertilizer
Authors: Yu Zhi Qiang , Ren Fei Peng
Published: January 2015

Organic fertilizer is an important material to improve soil physical and chemical properties , to improve soil fertility , crop yield and quality and enhancing crop resistance has a very important role . In recent years, the proportion of organic fertilizer for the Chinese fertilizer gradually decreased reality introduces the connotation and type of organic fertilizer , discusses the following issues: (1) organic fertilizer on soil fertility , including soil nutrients ( nitrogen, phosphorus, potassium, trace elements) , soil organic matter and structure , soil enzyme activity ; (2) the role of organic fertilizer to improve crop yield, quality and disease resistance . At the same time , pointed out the remaining organic fertilizer application in question , and the future development were discussed .
A New Test Environment Approach to SEE Detection in MOSFETs
Authors: Seixas Luis E. , Silveira M.A.G. , Medina N.H. , Aguiar V.A.P. , Added N. , Gimenez S.P.
Published: January 2015

This paper shows a comparison between two different MOSFET structures: a conventional layout (CM) and Diamond (DM - enclosed layout transistor), as tolerance to the Single Event effect - SEE. Both CMOS 0.35μm technology devices types have the same geometric factor (W/L) and during irradiation were monitored continuously to detect and acquire the SEEs applying a new approach with a PXI test system. For this work was used heavy ion beams produced at the São Paulo 8 UD Pelletron accelerator.
Laser Remelting of Silicide Coatings on Mo and TZM Alloy
Authors: Moskal Grzegorz , Grabowski Andrzej , Lisiecki Aleksander
Published: January 2015

Characterization of top surface and microstructure of silicide coatings obtained during diffusion process of pack cementation type and laser remelting treatments was showed in this article. The basic materials were pure Mo sheet and TZM molybdenum alloy. The coatings were deposited in powder process and glazed by different types of lasers. In first step the phase’s compositions of coatings was described by XRD analysis in initial condition and after remelting process. The morphology of the coatings top surface was described as well. All types of coatings were characterized by network of cracks on top surface of the coatings. Laser treatment of the silicide top surface changed morphology of the top surface, especially their cracks network. LM and SEM analysis revealed that internal coatings morphology was very similar in all cases.
The Structure of Coatings Obtained in a ZnAl23Si Bath by the Batch Hot Dip Method
Authors: Kania Henryk
Published: January 2015

In the paper the results of tests on obtaining ZnAl23Si coatings on low-silicon steel by use of the batch hot dip method have been presented. The growth kinetics of coatings obtained in a ZnAl23 bath with the content of 1% and 2% of Si has been defined. The structure has been developed, the chemical composition of particular structural components of the coating and its phase composition have been established. It has been determined that coatings obtained in the ZnAl23Si bath are continuous and they have uniform thickness. The presence of silicon in the bath allows to reduce excessive coating thickness. The coating is composed of an external layer which is formed by the bath components and of a diffusion layer of the intermetallic FeAl3phase.
The Possibility of the LME Phenomenon in Elements Subjected to Metallization in Zn Bath with Bi Addition
Authors: Mendala Jacek
Published: January 2015

Article presents the state of knowledge relating occurrences of liquid metals embrittlement. The results of experimental investigations of the LME phenomenon, reasons of its formation and influence of different parameters are described. In order to determine the basic mechanical properties of materials intended for research static tensile test was performed. Samples made of C66D and C70D steels with tensions stretching (500-800 MPa) at different values and kinds of loading during the hot dip metallization were investigated. Coating processes were made in zinc with 0.5% Bi addition and results were compared to zinc coating. The processes of hot dip metallization were done at 450°C temperature and immersion time 180 s. Coated samples were investigated by light microscope to specify possibility appear of LME effect.
Strength–Energy and Structural Effects of Dynamic Deformation of Aluminum Alloy
Authors: Płachta Adam , Pawlicki Jacek , Rodak Kinga
Published: January 2015

This paper presents the results of dynamic deformation tests performed on aluminum alloy PA4. The studiem was carried out by using rotary hammer, in the range of high rate of deformation: 400 – 2000 s-1. The test were carried using a rotary hammer of RSO type owned by Silesian Technical University in Institute of Technology Metals. Before the dynamic deformation, the heating treatment was carried out allowed for eliminating structural effects resulting from the previous technological treatments and for obtaining the homogenous grain structure. The tests were carried out with linear velocity in the range of 5 – 30 m/s. After deformation the following mechanical characteristics were determined: deformation limit εg, strain rate , tensile strength UTS, impact strength U. Independently of the dynamic deformation tests were carried out tensile test under static conditions. Moreover bending test were performed on Charpy type hammer with initial impact energy equal 300 J. The analysis of the microstructure was carried out using scanning electron microscopy Hitachi S–3400 N.
β-arrestin1 Is Critical for the Full Activation of NLRP3 and NLRC4 Inflammasomes
Authors: Mao Kairui , Chen Shuzhen , Wang Yan , Zeng Yan , Ma Yonglei , Hu Yu , Zhang Hong , Sun Shuhui , Wu Xiaodong , Meng Guangxun , Pei Gang , Sun Bing
Published: January 2015

Inflammasomes are multiprotein complexes that trigger the activation of caspase-1 and the maturation of IL-1β, which are critical for inflammation and control of pathogen infection. Although the function of inflammasomes in immune response and disease development is well studied, the molecular mechanism by which inflammasomes are activated and assembled remains largely unknown. In this study, we found that β-arrestin1, a key regulator of the G protein–coupled receptor signaling pathway, was required for nucleotide-binding domain and leucine-rich repeat containing (NLR) family pyrin domain–containing 3 (NLRP3) and NLR family CARD domain–containing protein 4 (NLRC4) inflammasome–mediated IL-1β production and caspase-1 activation, but it had no effect on absent in melanoma 2 (AIM2) inflammasome activation. Moreover, apoptosis-associated speck-like protein containing a CARD (ASC) pyroptosome, which is ASC aggregation mediating caspase-1 activation, was also impaired in β-arrestin1–deficient macrophages upon NLRP3 or NLRC4, but not AIM2 inflammasome activation. Mechanistic study revealed that β-arrestin1 specifically interacted with NLRP3 and NLRC4 and promoted their self-oligomerization. In vivo, in a monosodium urate crystal (MSU)-induced NLRP3-dependent peritonitis model, MSU-induced IL-1β production and neutrophil flux were significantly reduced in β-arrestin1 knockout mice. Additionally, β-arrestin1 deficiency rescued the weight loss of mice upon log-phase Salmonella typhimurium infection, with less IL-1β production. Taken together, our results indicate that β-arrestin1 plays a critical role in the assembly and activation of two major canonical inflammasomes, and it may provide a new therapeutic target for inflammatory diseases.
A cognitive-behavior therapy applied to a social anxiety disorder and a specific phobia, case study
Authors: Tsitsas George D. , Paschali Antonia A.
Published: January 2015

George, a 23-year-old Greek student, was referred by a psychiatrist for treatment to a University Counseling Centre in Athens. He was diagnosed with social anxiety disorder and specific phobia situational type. He was complaining of panic attacks and severe symptoms of anxiety. These symptoms were triggered when in certain social situations and also when travelling by plane, driving a car and visiting tall buildings or high places. His symptoms lead him to avoid finding himself in such situations, to the point that it had affected his daily life. George was diagnosed with social anxiety disorder and with specific phobia, situational type (in this case acrophobia) and was given 20 individual sessions of cognitive-behavior therapy. Following therapy, and follow-up occurring one month post treatment, George no longer met the criteria for social phobia and symptoms leading to acrophobia were reduced. He demonstrated improvements in many areas including driving a car in and out of Athens and visiting tall buildings.
Accuracy of physical self-description among chronic exercisers and non-exercisers
Authors: Berning Joseph M. , DeBeliso Mark , Sevene Trish G. , Adams Kent J. , Salmon Paul , Stamford Bryant A.
Published: January 2015

This study addressed the role of chronic exercise to enhance physical self-description as measured by self-estimated percent body fat. Accuracy of physical self-description was determined in normal-weight, regularly exercising and non-exercising males with similar body mass index (BMI)’s and females with similar BMI’s (n=42 males and 45 females of which 23 males and 23 females met criteria to be considered chronic exercisers). Statistical analyses were conducted to determine the degree of agreement between self-estimated percent body fat and actual laboratory measurements (hydrostatic weighing). Three statistical techniques were employed: Pearson correlation coefficients, Bland and Altman plots, and regression analysis. Agreement between measured and self-estimated percent body fat was superior for males and females who exercised chronically, compared to non-exercisers. The clinical implications are as follows. Satisfaction with one’s body can be influenced by several factors, including self-perceived body composition. Dissatisfaction can contribute to maladaptive and destructive weight management behaviors. The present study suggests that regular exercise provides a basis for more positive weight management behaviors by enhancing the accuracy of self-assessed body composition.
Immune Response of Blue Mussels (Mytilus edulis) in Spawning Period Following Exposure to Metals
Authors: Vaillancourt C.
Published: January 2015

Mytilus edulis are sensitive to environmental contamination like metals, such as silver (Ag), lead (Pb), cadmium (Cd) and mercury (Hg), which are bioavailable for this species [...]
In Vitro Effect of Five Pharmaceuticals on the Viability of the European Abalone Hemocytes, Haliotis tuberculata
Authors: Serpentini A.
Published: January 2015

Pharmaceutical compounds are a class of emerging contaminants with potential concern for the aquatic environment [...]
A review of a decade’s scholarly publications (2004–2013) in the South African Journal of Industrial Psychology
Authors: Coetzee Melinde , Van  Zyl Llewellyn E.
Published: January 2015

Orientation: Publishing methodologically sound, empirically based studies in reputable accredited scientific journals are essential in order to advance knowledge and evidence-based practice in the field of industrial and organisational psychology.Research purpose: The purpose of the research was to conduct a broad content analysis of the articles published in the South African Journal of Industrial Psychology (SAJIP) between 2004 and 2013. The study aimed to provide a descriptive overview of the most frequent content themes,published authors and institutions, research approaches, strategies, designs and analysis techniques, software packages and sample sizes in industrial and organisational (I-O) psychology utilised in the publications.Motivation for study: The periodic analyses of published content in scholarly journals provide an index of the extent to which the publications reflect the scope of practice in a given discipline and broaden insight into the direction and relevance of research published in a journal.Research design, approach and method: A broad systematic content analysis was conducted of 342 documented articles published in the SAJIP between 2004 and 2013. Descriptive data(frequencies and percentages) were used to report the findings.Main findings: The publishing pattern of the SAJIP appeared to correspond with its focus and scope. Manuscripts utilising mostly cross-sectional quantitative correlational research designs with large samples (n > 201) were published in the SAJIP. The University of Johannesburg and Professor Sebastiaan (Ian) Rothmann were the largest contributors to publications between 2004 and 2013. Organisational psychology and psychometrics were the most prominent domains in I-O psychology research. Data were predominantly processed utilising SPSS.Practical implications: The insights derived from the findings can be employed to plan future research initiatives in the field of I-O psychology.Contribution/value-add: The findings provide valuable insight into the current status of the foci of I-O psychology research as published in the SAJIP between 2004 and 2013 and the contribution made by the SAJIP to advancing knowledge and evidence-based practice in I-O psychology.
A global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming
Authors: Eguchi N. , Kodera K. , Nasuno T.
Published: January 2015

Abstract. The dynamical coupling process between the stratosphere and troposphere in the tropical tropopause layer (TTL) during a~stratospheric sudden warming (SSW) in boreal winter was investigated using simulation data from a global non-hydrostatic model (NICAM) that does not use cumulus parameterization. The model reproduced well the observed tropical tropospheric changes during the SSW, including the enhancement of convective activity following the amplification of planetary waves. Deep convective activity was enhanced in the latitude zone 20–10° S, in particular over the southwest Pacific and southwest Indian Ocean. Although the upwelling in the TTL was correlated with that in the stratosphere, the temperature tendency in the TTL changed little due to a compensation by diabatic heating originating from cloud formation. This result suggests that the stratospheric meridional circulation affects cloud formation in the TTL.
Simulations of atmospheric methane for Cape Grim, Tasmania, to constrain southeastern Australian methane emissions
Authors: Loh Z. M. , Law R. M. , Haynes K. D. , Krummel P. B. , Steele L. P. , Fraser P. J. , Chambers S. D. , Williams A. G.
Published: January 2015

Abstract. This study uses two climate models and six scenarios of prescribed methane emissions to compare modelled and observed atmospheric methane between 1994 and 2007, for Cape Grim, Australia (40.7° S, 144.7° E). The model simulations follow the TransCom-CH4 protocol and use the Australian Community Climate and Earth System Simulator (ACCESS) and the CSIRO Conformal-Cubic Atmospheric Model (CCAM). Radon is also simulated and used to reduce the impact of transport differences between the models and observations. Comparisons are made for air samples that have traversed the Australian continent. All six emission scenarios give modelled concentrations that are broadly consistent with those observed. There are three notable mismatches, however. Firstly, scenarios that incorporate interannually varying biomass burning emissions produce anomalously high methane concentrations at Cape Grim at times of large fire events in southeastern Australia, most likely due to the fire methane emissions being unrealistically input into the lowest model level. Secondly, scenarios with wetland methane emissions in the austral winter overestimate methane concentrations at Cape Grim during wintertime while scenarios without winter wetland emissions perform better. Finally, all scenarios fail to represent a~methane source in austral spring implied by the observations. It is possible that the timing of wetland emissions in the scenarios is incorrect with recent satellite measurements suggesting an austral spring (September–October–November), rather than winter, maximum for wetland emissions.
A two-layer canopy with thermal inertia for an improved modelling of the sub-canopy snowpack energy-balance
Authors: Gouttevin I. , Lehning M. , Jonas T. , Gustafsson D. , Mölder M.
Published: January 2015

Abstract. A new, two-layer canopy module with thermal inertia as part of the detailed snow model SNOWPACK (version 3.2.1) is presented and evaluated. This module is designed to reproduce the difference in thermal response between leafy and woody canopy elements, and their impact on the underlying snowpack energy balance. Given the number of processes resolved, the SNOWPACK model with its enhanced canopy module constitutes a very advanced, physics-based atmosphere-to-soil-through-canopy-and-snow modelling chain. Comparisons of modelled sub-canopy thermal radiation to stand-scale observations at an Alpine site (Alptal, Switzerland) demonstrate the improvements of the new canopy module. Both thermal heat mass and the two-layer canopy formulation contribute to reduce the daily amplitude of the modelled canopy temperature signal, in agreement with observations. Particularly striking is the attenuation of the night-time drop in canopy temperature, which was a key model bias. We specifically show that a single-layered canopy model is unable to produce this limited temperature drop correctly. The impact of the new parameterizations on the modelled dynamics of the sub-canopy snowpack is analysed and yields consistent results but the frequent occurrence of mixed-precipitation events at Alptal prevents a conclusive assessment of model performance against snow data. The new model is also successfully tested without specific tuning against measured tree temperatures and biomass heat storage fluxes at the boreal site of Norunda (Sweden). This provides an independent assessment of its physical consistency and stresses the robustness and transferability of the parameterizations used.