bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of FePO4 Hollow Microspheres with Bilayer Shell by a Biotemplate
Authors: Cao Feng , Li Dong Xu , Wu Zheng Ying
Published: March 2013

Monodispersed iron phosphate hollow microspheres with high uniformity were synthesized by using the rape pollen grains as biotemplate. The as-prepared microspheres were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, energy disperses spectroscopy and scanning electron microscopy. The shell of the microspheres was found to be a bilayer structure composed with a compact inner layer and rough outer layer. Through the investigation of the adsorption behavior of the pollen grains, the formation of the bilayer structure was attributed to the selective permeation of the pollen wall. The inner layer was formed by the ion passed through the pollen wall and adsorbed on the pollen core; while the outer layer was formed by the coating of the particles could not permeate the pollen wall. When the pollen grains were removed by the calcinations, both of the precipitate in the pollen and on the pollen wall were condensed to from the hollow microspheres with a shell of bilayer. This process provides us with a new insight on the preparation of the hollow microspheres with special structure using the pollen grains as biotemplate. The microspheres with core/shell or multilayer structure should be achieved by utilization of the selective permeation of the pollen wall.
Preparation of Large Monodispersed Spherical Silica Particles Using Stöber Method
Authors: Zhang He , Wei Jun Fang , Zhu Fang
Published: March 2013

To obtain large-sized, monodispersed spherical particles of silica by Sol-Gel, the classic Stöber method was optimized. Effects of the type of solvents，reaction temperature and reaction time on the particle sizes and the particle diameter distribution of silicon dioxide were investigated by scanning electron microscopy (SEM). The results show that the monodisperse silicon dioxide spherical particles with 1.0μm diameter could be obtained in isopropanol solvent under a suitable reaction condition. When the reaction temperature is increased, the silica particle size will decrease. The particle sizes increase first and decrease later as the reaction time passing. The addition method of TEOS has great effects on the morphology and size of silicon dioxide spherical particles.
Surface Morphology of Films Grown by Size-Selected Ta Nanoparticles
Authors: Singh Vidyadhar , Cassidy Cathal , Bohra Murtaza , Galea Antony , Hawash Zafer , Sowwan Mukhles
Published: March 2013

Tantalum nanoparticle (NP) films have been deposited on silicon substrates, using sputter deposition with gas aggregation. The resultant NP films have been characterized using high resolution atomic force microscopy and X-ray fluorescence spectroscopy. The films remain stable and the NPs maintain a spherical structure on annealing up to 600 °C. In addition to characterization, these NP films have been locally patterned by atomic force microscope scanning of the surface in contact mode.
Steel Corrosion Inhibition for the Development of Surface Permeating Agent
Authors: Kim Ki Beom , Lee Jong Suk , Kim Do Gyeum
Published: March 2013

Most power plant structures- including the nuclear reactors- are constructed mainly out of concrete and are exposed to harsh environmental conditions as they are constructed near the sea. The establishment of an effective management method to prevent and counter aging degradation is very important in the perspective of life cycle management due to the characteristics of structures where complete replacement of problem sources is not possible. When establishing a plan for aging degradation of concrete structures, the key focus should be on the fact that the molecule of concrete is not as tight as steel and is a porous material with many pore spaces making it vulnerable to salt damage, neutralization and other key factors to penetrate the surface and degrades the durability of the structure. Thus, this study aims to create a new application system geared toward the usage of new material base surface penetration supplements and the characteristics of power plants to protect the concrete structure from degradation factors and recover the capability of the structure.
Study on the Syntheses of Ferrofluids by Different Iron Compounds and their Specific Adsorption Rate of Magnetic Fluid Hyperthermia
Authors: Tsai Chang Shu , Liu Wei Chung , Chen Hong Yi
Published: March 2013

The highest SAR (specific adsorption rate) value of ferrofluid was found to be 28.5±1.9W/g, when prepared by using ferrous chloride tetrahydrate (FeCl2•4H2O) and iron(III)nitrate 9-hydrate(Fe(NO3)3• 9H2O) with the 1:1 ratio of iron compound’s molarity. The SAR values of ferrofluids were found to be 62.0±6.5, 59.4±10.3, and 66.0±5.0 W/g, respectively, when prepared by using ferrous sulfate 7-hydrate (FeSO4•7H2O) and ferric chloride hexahydrate (FeCl3•6H2O) with the 1：2.5, 2.5：1, and 3：1 ratio of iron compound’s molarity . The SAR values of ferrofluids were found to be 66.6±7.0 and 63.5±6.0 W/g respectively, when prepared by using ferrous sulfate 7-hydrate (FeSO4•7H2O) and iron(III)nitrate 9-hydrate (Fe(NO3)3•9H2O), with the 1：1, 1：1.5 and 1：2 ratio of iron compound’s molarity. The SAR values of ferrofluids were found to be 84.7±12.7, 93.4±14.2 and 89.2±6.4 W/g, respectively, when prepared by using ferrous chloride tetrahydrate (FeCl2•4H2O) and ferric chloride hexahydrate (FeCl3•6H2O), with the 1：1, 1：1.5 and 1：2 ratio of iron compound’s molarity .
Using Modified DLA Model Simulation of the Form of Copolymer Flower-Like Aggregation
Authors: Li Dong Xia , Ke Tian Yu , Yang Xu Hong
Published: March 2013

In this papper, based on the study of basic algorithm of fractal DLA model, the standard DLA model was modified by setting the parameters, and the PS-b-PAA block copolymer representating a kind of flower-like aggregation was taken as the research object. Through observating the growth characteristics of this kind of flower-like aggregations formed in different external conditions, their fractal characteristics were determined by box-counting method. Then the modified DLA model combined with the image processing technology was used to simulate this kind of flower-like aggregations. Finally, the simulated results were evaluated through visual observation and fractal dimension.
Valve-Less Diaphragm Micropump with Electromagnetic Actuation
Authors: Chang Yaw Jen , Chung Yun Wei , Chou Ting An , Huang Min Fen
Published: March 2013

In this paper, a micropump with electromagnetic actuation is presented. The micropump mainly consists of coil actuators and a PDMS micropump layer. The microcoil was fabricated using the printed circuit board (PCB) with the conventional PCB treatment and the PDMS layer was formed by casting technique. A control circuit was designed using microcontroller to produce square waves to control coil actuator. Due to the simple fabrication process, the micropump can be incorporated in a disposable PDMS lab-on-a-chip device as a fluid actuation component. However, the coil actuator is reusable. In addition, the control circuit makes the micropump portable. The experiment results show that this proposed micropump is capable of delivering a flow rate of 470 μL/min using one coil actuator.
In Vivo Osteogenic Effect of Porous β- CaSiO3/PDLGA Composite Scaffolds
Authors: Wang Chen , Lin Kai Li , Chang Jiang , Sun Jiao
Published: March 2013

The aim of the present study is to evaluate the in vivo biological behaviour of porous β-CS/PDLGA scaffolds. The scaffolds were implanted in critical-sized femur defects ( 6 ×10 mm) for 4, 12 and 20 weeks with β-TCP scaffolds as the control. The in vivo bone regeneration of the scaffolds were investigated using sequential histological evaluations and Micro-CT technology. Results showed that the β-CS/PDLGA scaffolds could stimulate bone regeneration and degrade progressively at a rate proportionate with the regeneration of new bone as compared with β-TCP scaffolds. The present study suggested the potential application of β-CS/PDLGA scaffolds in hard tissue regeneration.
Effect of the Ratio of Silica Source on Ultra-Light Calcium Silicate Material In Situ Strengthened with Xonotlite Whiskers
Authors: Liu Fei , Li Ting , Wang Xiao Dan , Cao Jian Xin
Published: March 2013

The ultra-light calcium silicate material was reinforced with the method of xonotlite whisker in-situ growth via hydrothermal synthesis. Effects of different ratios of silica sources on microstructure and mechanical properties of the reinforcement were studied in this paper. The results indicated that the ratios of silica sources posed great impacts on microstructure and mechanical properties of the reinforcement. The reinforcement with density of 118 Kg•m-3, flexural strength of 0.42 MPa and compressive strength of 0.66 MPa was successfully prepared under the condition of K2SiO3:H2SiO3 (mol) =2:1.
Influence of Hydrothermal Conditions on Ultra-Light Calcium Silicate Material In Situ Strengthened with Xonotlite Whiskers
Authors: Liu Fei , Li Ting , Wang Xiao Dan , Cao Jian Xin
Published: March 2013

The ultra-light calcium silicate material was reinforced with the method of xonotlite whisker in-situ growth via hydrothermal synthesis. Effects of different hydrothermal temperatures and reaction times on the microstructure and physical properties of the reinforcement were studied in this paper. The results indicated that the hydrothermal temperatures and times posed great impacts on microstructure of the reinforcement. The increase of hydrothermal temperature and time was beneficial to the growth of xonotlite crystal. The effect of buffer and transfer action of the xonotlite whiskers was the key to reinforcing the ultra-light calcium silicate material.
Application on Monitoring the Earthen Roadbed Filling of Highway with Engineering Materials
Authors: Huang Bei Lei , Liang Xian
Published: March 2013

The quality of highway roadbed construction which affects the overall performance of highway is the most important to the highway construction. The roadbed is the crucial part of highway engineering. Its stability directly restricts the process of the highway roadbed construction, quality and the engineering costs, and relates to the security of people's lives and property, and to the regional economic development. And the roadbed soft foundation treatment is the key to construction of subgrade, usually by apply pad chemical fiber non-woven fabrics, geotextile, glass fiber grating way to deal with soft foundation. This article is to analyze the monitoring data of the highway roadbed engineering and to study the process and means of highway roadbed monitoring[1]. Actually, it helps and guides us to deal with the highway’s soft foundation significantly.
Estimation of the Time Constant of Plunge Grinding of C45 in Infeed Period with Properties of Mechanical Materials Based on Acoustic Emission Measurement
Authors: Jiang Chen , Li Hao Lin , Mai Yun Fei , Chi Yu Lun
Published: March 2013

To monitor the precision cylindrical grinding process, an estimation of the time constant of grinding system, using acoustic emission signal, is presented during infeed period in this paper. Acoustic emission signals generated during precision grinding are sensitivity and present challenges for accurate and reliable process monitoring. Experiments demonstrate the results of the acoustic emission sensing approach in estimating the time constant. This estimation of the time constant can be used to analyze the properties of mechanical materials of the workpiece with the same grinding conditions.
Study on Energy Consumption and Energy Saving Emission for the Low Carbon Economy in Yunnan with Uncertain Factors and Policy Recommendations
Authors: He Qiang , Tan Qian
Published: March 2013

The paper uses a large amount of data uncertainty analysis of a the Yunnan "12th Five-Year" period of low-carbon development, pointed out that economic development, eliminate backward production capacity, energy consumption and energy saving will be contradictions, and the main problem of the reality of low-carbon development in Yunnan.
Research and Design of Multigrounded in Micro-Grid Power Supply with Analysis of Electricity Energy
Authors: Wang Wen Xing , Wang Guang Zheng
Published: March 2013

After a large number of distributed electricity energy has been accessed to network, the system structure and operating characteristics of the distribution network will be greatly changed. The multigrounding of the micro-grid system was discussed from the provisions of the relevant electrical standards and the view of practical point. It is clear that PE wire is the repeated grounding instead of N repeated grounding in the TN system of micro-grid, and multigrounding problems that should be attention were described in TN-S and TT systems of micro-grid.
Research of Micro-Grid Power System Grounding and RCD for Energy Saving
Authors: Wang Wen Xing , Zhang Jin Hua
Published: March 2013

After a large number of micro-grid power has been accessed to energy saving, the system would bring new challenges to the power distribution network in planning, design and construction. RCD directly related to the safety of persons and equipment. This article describes the commonly type of grounding protection, and analyze their respective advantages and disadvantages of the structure and characteristics of the micro-grid power supply system, the structure and characteristics of the ground type in the micro-grid power supply system were studied, the choice of RCD were focused on.
An Analysis on the Water Consumption Rate of LongTan Hydropower Station with Properties of Water Energy
Authors: Lei Xiao Guang , Yin Ao
Published: March 2013

The mathematical model of water consumption rate of LongTan Hydropower Station is established in this thesis. With the aim of reaching the minimum total water consumption of power generation, Equation Incremental Rate is used to solve this mathematical model with constant overall load of the hydropower station. Equation Incremental Rate is used in this thesis to solve some instances, prove the rationality of the mathematical model established and demonstrate that the unit load value calculated can direct the actual operation of the hydropower station better, thus the aim of energy saving and consumption reducing can be achieved.
Study on Energy Saving with Chinese Regional Energy-Economic Efficiency Analysis Based on SBM Model
Authors: Liu Xiao Chen , Qian Zheng Ming
Published: March 2013

Energy saving has been attached great importance in China. This paper measures the energy-economic efficiency levels of 28 provinces in mainland China from 1985 to 2010 with the SBM model considering undesirable outputs, and then analyzes the regional differences. The empirical results indicate that energy-economic efficiency level of eastern area is in absolute predominance while both the middle and west's levels are lower than the average level of the whole nation. Finally, some practical suggestions are provided to improve the regional energy saving levels.
Design of Intelligent Telephone Alarm System with Intelligent Control System
Authors: He Juan , Kang Shuai
Published: March 2013

The intelligent telephone alarm system is designed with a single chip microcomputer as the core of system,and the intelligent system is controlled by AT89C51. A telephone network is used as transmission of voice digital information in the system. The telephone alarm is composed of a single-chip microcomputer control, sensor and signal input circuit, and DTMF send and receive circuit, voice controlling and receiving circuit, alarm telephone circuit. According to the different sensor output signal, it can send out different alarm information to realize remote monitoring function.
Research of Network Monitoring Management System Based on Artificial Immune
Authors: Ma Jian Hong , Ji Li Xia
Published: March 2013

In order to solve the traditional network monitor management system fault detection of slow problem,adaptive differential of high false alarm rate we built network monitor system model combined with the artificial immune principle.Through artificial immune "self" and "non-self" recognition ability network monitoring algorithm simulated the matching,negative selection,memory mechanism of artificial immune system detection of network fault.Throughout the design process,we studied the biological immune characteristics,antibody affinity and concentration of concepts the antibody selection probability algorithm was proposed.The algorithm enhanced new antibody generation mechanisms,memory mechanism the and tolerance of the system to establish the network monitoring system provides the theoretical model.
Global MPPT Control of Solar Photovoltaic System for Energy Saving Based on the Fuzzy Strategy
Authors: Shan Ya Zhou , Yang Cheng Zhi , Sun Hao
Published: March 2013

In this paper, a strategy of global Maximum Power Point Tracking (MPPT) for energy saving based on fuzzy logic control is presented and its characteristic is to combine intelligent booster with the fuzzy MPPT control technology. Through detecting the change of the power output of the solar photovoltaic system, maximum power point is tracked by regulating the duty ratio of switch tube automatically. The simulation results show: when the sunlight intensity is changed from weak to strong, the changes of power can be rapidly tracked and it always closes to the maximum power point and has good stability.
Multiple Criteria Decision Making Research of Flight Control System Design
Authors: Nie Rui , Zhang Bai Nan , Liu Bao Ning , Zhang Wei Guo , Yuan Jing
Published: March 2013

Flight control system; multiple criteria decision making; multiple objective decision making; multiple attribute decision making; neural network; mean impact value index. Abstract. It is complex and difficult to tune the parameters of the flight controller. To solve such problem, a multiple objective decision making (MODM) method by using the reference model which is built based on the criteria, is proposed. In order to resolve defects of the multiple attribute decision making (MADM) that the arbitrary of the subjective attribute weights and ignoring the objective message of the objective attribute weights, a subjective attribute weights based on the BP neural network by using the MIV (mean impact value) index is proposed. Finally, a combining method based on the TOPSIS is used to give the final attribute weights. The simulation results show that the method could obtain a set of trade-off solutions which satisfy the requirements of the MODM and could tune the controller effectively.
Study on the Ecological Environmental Conditions of Truffle with Analysis of Biomaterials
Authors: Hu Shang Qin , Yang Xin , Wei Wei , Guo Xia
Published: March 2013

In order to clarify the initial growth of the truffle environmental conditions, the use of PDA plus rich liquid medium, shaking method, its growth temperature, pH, humidity, moisture, illumination and the several other ecological factors is tested. The results show that the optimum temperature of the growth stage is 22-24 °C,Mycelium biomass is 1.45-1.56 g•L-1 .but the latter part of truffle formation temperature can be appropriately higher, at 25-30 °C, which is consistent with the natural temperature. PH at 6.8-7.5 in conditions is comparetively suitable for truffle growth , Mycelium biomass is 1.57-1.58 g•L-1,but alsobetter in the slightiy alkaline conditions than in the acidic environment ,which is different from the other fungi.It is suitable for its growth at about 35% moisture content and humidity of 80-85% mycelium growth is 90.1% , too much water is not conducive to truffle growth and development, so the truffle needs to loose and slightly moist soil in the growth and development. Truffle needs not too much illumination a day, 2h scattering light is enough, mycelium growth is88.7%, too long ilumination , especially in direct sunlight is not conducive to truffle growth. . And citric acid and glucose as the carbon sources, urea and tartaric acid as the nitrogen sources, the amenit of truffle growth, is respectively2.92 g•L-1、2.61 g•L-1，2.35g•L-1、2.26 g•L-1. This further research on the development as well as artificial truffle cultivation provides a theoretical reference.
Influence of the Trace Boron Element on Corrosion Behavior of 1Cr17 Stainless Steel in 10% Hcl Solution
Authors: Guo Tie Ming , Hui Zhi , Nan Xue Li , Han Chang Song , Zhang Ding Cang
Published: March 2013

Four groups of 1Cr17 stainless steel with diffirent wt% of boron ( 0ppm, 16ppm, 22ppm and 28ppm ) were smelted by a vacuum induction furnace. Then chemical immersion and electrochemical method (the tafel polarization curve method) were used to investigate their corrosion behavior at different temperature (25 °C, 40 °C) in HCL medium . The results show that after adding Boron elements of the 1Cr17 stainless steel sample, it is obvious that its resistance to general corrosion increases and the resistance to intergranular corrosion weakens; at different temperature (25°C, 40°C)in 10% hydrochloric acid solution medium the Corrosion kinetics law are different, while with B element content increases, the immersion corrosion rate decreases. in the reducing hydrochloric acid solution, sample with boron elements show a good behavior on corrosion resistance.
The Preparation of Red Mud Lightweight Ceramsite
Authors: Ma Long , Li Guo Zhong
Published: March 2013

The red mud lightweight ceramsite was made by using red mud, fly ash and bentonite, mixed with a certain amount of pore-forming agent and foam stabilizer, through the roasting process. Influence of pore-forming agent on red mud ceramsite was studied. The microscopic morphology of red mud lightweight ceramsite damage fracture was analyzed by using scanning electron microscope. The results show that with 6% pore-forming agent, the apparent density is 731kg/m3, the bulk density is 547kg/m3; the cylinder compressive strength is 3.3Mpa, the water absorption is 9.7%.
Development of Building Elements with Thermal Insulation Filler Based on Secondary Raw Materials
Authors: Zach Jiri , Sedlmajer Martin , Hroudová Jitka
Published: March 2013

With increasing requirements for properties of envelope design in respect of thermal protection of buildings also requirements for building material properties have been growing. In case of ceramic shaped pieces for peripheral structures the way to further improvement of its thermal insulation properties is quite difficult. Generally thickness of interior groins can be reduced and its geometrical layout changed or the ceramics blocks dimensions increased and thus width of the masonry construction. Use of insulation filler integrated in block cavities is the alternative technology of production of insulation special shapes of high insulation properties. In these cases the ceramic fragment ensures the mechanical stability of the block and integrated insulation layer in smaller or bigger part (depending on its part) the thermal properties and eventually also the acoustic and insulation ones. The paper describes application possibilities of insulation materials based upon waste textile fibres as integrated layer in current masonry ceramic blocks of high utility properties.
The Evaluation of Nearly Zero Energy Buildings in the Czech Republic
Authors: Kraus Michal , Konečný Filip
Published: March 2013

The Energy Performance of Buildings Directive requires that all new buildings must be nearly zero energy buildings by 2020. A nearly zero energy building is a building that has a very high energy performance. The current absence of evaluating the nearly zero energy buildings encourages to set up simple and explicit methodology for evaluation nZEB in the Czech Republic. The evaluation of the nearly zero building is based on the annual balance of energy.
Thermal Stability of Attic Spaces with Integrated PCMs during the Climatic Year
Authors: Bečkovský David , Ostrý Milan , Kalábová Tereza , Tichomirov Vladimír
Published: March 2013

This paper deals with the impact of using phase change materials (PCM) in light building constructions. It describes how these materials react during the whole year, how they impact the summer temperature stability of a room and how they react in the transition period and in the heating period. Measuring was carried out in the experimental and reference room in the attic of the Institute of Building Structures. The layout of these identical rooms enables to compare the measured values. The measuring of the indoor climate, which had been carried out during the whole year in the reference and experimental room, was analyzed. The analysis was used to create the basic methodological procedure for using PCM in light building constructions. These materials proved to be efficient in the summer time. During the heating period the power consumption was monitored in relation to the application of the phase change materials.
Six Points of Resistence for a Renewable Energy Based Architecture – A Case Study
Authors: Petrea Sergiu Catalin
Published: March 2013

Contemporary architecture is more often thought about in the terms of self-sustainability and price efficiency. Choice of materials and the overall design including the building structure and the enclosures, its energy systems, the reuse of resources and the minimum waste production are discussed all over the world. Implementing buildings in natural sites or in sub-urban communities that are not connected to the usual urban facilities is always a challenge if we intend to use sustainable strategies. Our approach describes a case study of a design strategy based on a few general principles, crucial in optimizing material and energy consumption and waste and emissions reduction for a new construction. We will follow the interdisciplinary approach of the design process analyzing how each step taken to a certain direction affects the entire planning stage, influencing also the constructive systems. Also we will show how every used element influences the processes of the building with certain constraints for the architectural approach, especially in terms of functional and aesthetic valences.
Buildings Built by Superadobe Technology and other Possibilities Use of Clay Plaster
Authors: Kovářová Barbora
Published: March 2013

The article deals with the description of structural system Superadobe and possibilities of its application in building construction for an individual living in the present as system environmentally friendly. The article deals also with analysis of further possibilities of use of clay plaster in the construction.
A New Building System Made of Glass Fiber Reinforced Mineral Matrix Composites
Authors: Taranu George , Budescu Mihai , Plesu Raluca , Toma Ionu Ovidiu
Published: March 2013

The glass fiber reinforced mineral matrix composite (GFRMMC) solutions allow designing modular structural elements made of prefabricated panels. Important research works on calcium sulphate in the beta anhydride III’ form, led in finding a mixture with increased workability capable to be cast on glass fiber reinforcement and obtaining composite elements. This paper presents the results of designing concept for a new structural system for building houses made of GFRMMC. Prototypes for elements and building system made after the design processes are summarized. Observations of structures regarding the structural behavior, thermal efficiency or indoor air quality are presented in the conclusions. The technology and the structural systems analyzed have many advantages to be considered as an alternative for traditionally building systems.
Acoustic Properties of Timber Joist Ceilings with Respects to their Response onto the Effects of Dynamic Loads
Authors: Donaťáková Dagmar , Krupicová Jana , Kolářová Zuzana , Straka Bohumil
Published: March 2013

The paper discusses some issues connected to timber joist ceilings found not only in historical protected buildings but also in newly designed multi-storey timber based ones, with regards to their acoustic parameters perceived by the inhabitants of such objects. These problems are usually connected to the complaints of the users because of unsatisfying acoustic conditions indoors, observed mainly at low frequencies, even though the requirements given by the legislation are met. The paper with its content is a reaction to the contradiction between the results coming from measurements and subjective perception, and is complemented by structural evaluations seeking the effects of dynamic tremors and vibrations.
Analysis of Local Moisture Increase of Timber Constructions on Ice Arena Roof
Authors: Žák Antonín , Sikula Ondrej , Trcala Miroslav
Published: March 2013

Timber is one of the most used materials for roofing of ice arena because of its very good mechanical properties and low weight. High relative humidity of internal air, low temperature and ice rink presence, which cause fall of surface temperatures of constructions under the dew point due to radiation, are risky factors not only from structural point of view, when load bearing capacity of construction in time is reduced, but also from the view point of bio corrosion. Specific hygrothermal microclimate, different from air parameters in the ice arena, is formatted close to the individual members of roof construction. Newly developed mathematical and physical model using CFD simulation is used for simulation of hygrothermal stress in chosen part of the ice arena roof construction, which substantially affects quality, utility properties and life time of timber roof components. Results are compared with experiments in specific ice rink.
TRNSYS Software Model of Solar System with Long-Term Storage
Authors: Kny Martin , Urban Miroslav
Published: March 2013

The article describes a model of a real solar system created in the Trnsys simulation tool. 2011 data were used as the input data (solar radiation, exterior temperature, heat consumption). The output data from the computed model were compared to the values recorded by a monitoring system.
Utilization of Indirect Adiabatic Cooling in Heat Recovery Device
Authors: Nehasil Ondřej , Adamovský Daniel
Published: March 2013

Decreasing heat load of buildings and their cooling is a major problem affecting the quality of both inner environment and air-conditioning system's energy demands. One of the alternatives using regular components of a standard air-conditioning unit is indirect adiabatic cooling. By means of a customized calculation procedure, this article demonstrates performance possibilities, energy savings and the economic benefits of indirect adiabatic cooling connected with a heat recovery heat exchanger on two air-conditioning unit alternatives.
Analysis of an Indoor Environment in Year-Round Operation
Authors: Katunský Dušan , Bagoňa Miloslav , Vertaľ Marián , Vaskova Anna , Kamenský Martin , Nemec Maros
Published: March 2013

Implementation of energy efficient buildings is one way to meet the requirements of the European Parliament, which has adopted the agreement 20/20/20. Given the low percentage of the amount of energy efficient buildings in the climatic conditions of the Slovak Republic is a little knowledge of their real operation. The paper describes the experimental measurement of the physical quantities in energy-efficient building is selected in the climatic conditions of the SR in the introduction of the contribution is a description of an experimental building, in which the measurement was done, the description and the deployment of measuring instruments. The conclusion of this paper is devoted to processing and statistical analysis of measured physical quantities. The analysis results show that the internal state of residential houses is largely influenced by home users.
Effect of the Geometric Solution of Cladding on the Quality of the Indoor Microclimate
Authors: Fabian Radek , Kozakova Marketa , Čmiel Filip , Rykalová Eva
Published: March 2013

This paper deals with the comparison of the effect of the contact thermal insulation in the connection of the loggia slab to the stair wall of construction panel system T 06-B produced in Prefa Olomouc. Measurements took place in two panel houses, where parameters of internal and external air were measured. The thermally insulated building is compared with the untreated building. The temperature factor at the internal surface, which eliminates the boundary conditions of the measurement, was used as a comparative element. The measured values were statistically evaluated.
Experimental Timber Frames House EXDR1
Authors: Kalábová Tereza , Horáčková Michaela , Vajkay František
Published: March 2013

Research and development at Brno University of Technology, Faculty of Civil Engineering is focused on the experimental assessment of modern timber structures. For the assessment of the influence of different timber structures on indoor environment a comparative method is used. This method is based on the measurement of indoor environment parameters in the experimental house. There are 4 test (reference) rooms, each of them having the same geometry but a different light-weight composition of envelope which are flexible at the same time.
New Materials and Assessment of Ventilation Efficiency Floors
Authors: Jurka Jiří , Škramlík Jan
Published: March 2013

The main subjects of the thesis are new materials and assessment of ventilation efficiency floors. As we are working with old buildings most of all, in most cases waterproofing is not working and simply it is missing. The rising humidity can, without any problems, penetrate higher to the brickwork or flooring above. Therefore we need a suitable solution. Software CFD is capable of flow visualisation which is then used as the base for the ventilation efficiency assessment.
Sol-Gel Derived Mesoporous Silica Nanoparticles under Base Catalysis for Uses as Anti-Reflective Coating Layers
Authors: Loryuenyong Vorrada , Boonsiri Kamonchanok , Ketkeaw Vicharat , Phuangkeaw Ukrit , Buasri Achanai
Published: March 2013

In this study, mesoporous silica nanoparticles were synthesized through sol-gel method, employing tetraethylorthosilicate (TEOS) as a precursor under base-catalyzed condition. The reaction temperature was kept constant at 50→C. The results indicated that the properties of silica nanoparticles could be controlled by altering the calcination temperatures. It has been found that silica nanoparticles synthesized under base-catalyzed and calcined at 600→C are uniform, well-dispersed and spherical-shaped. The anti-reflective behavior and the methylene blue adsorption capacity are optimized when calcined at this temperature.
Study the Method of the Polyester Short Fiber-Nature Rubber Composite Mix
Authors: Liu Cai Jun , Han Xue Zheng , Su Shi Tian
Published: March 2013

Mixing is the first step for rubber processing. For the short fiber-rubber composite materials, whether the short fibers, carbon black and other additives in the rubber are dispersed well or not has a direct bearing upon the subsequent processing of materials and final performance. Because of the softness of the short fibers, they are easy to group or break during the process of mixing. The research in this paper is conducted by experiment on the methods which are applicable for mixing or mixing rotor of short fiber-rubber composite materials so as to guarantee the materials have good dispersion and the short fibers have rational L/D ratio.
Research on the Stability of the Paste-Like Silicone Impregnant
Authors: Gu Wen Juan , Li Ying , Liu Ji Ke
Published: March 2013

The protecting of concrete, which consists of coating a chemical substance onto concrete’s surface, has been applied to architectural conservation. There is increasing interest in studying materials for concrete which can reduce the infiltration of water and salt solutions and rehabilitate and extend its service life. Silicon compounds are frequently used as a base for commercial protecting paint due to their hydrophobicity and penetrability. However, the stability of the impregnant emulsion is affected by many factors. The effect of three main factors such as component, pH, and emulsifier were studied in this paper. The stability of the impregnant decreased with the increase of pH. And the mixed emulsifier and 4～6% amount of emulsifier would be optical for the stability of the system and maintain the activity at the same time.
The Research of the Wc-17co Abrasion-Resistant Coating by the D-Gun System on the Aluminium Alloy Substrate
Authors: Wu Xu , Guo Zhi Meng
Published: March 2013

This work use the D-gun system to spray the WC-17Co coating. analyzed the microstructure and performance of the coating by SEM, EDAX, XRD, HAXD. It gave a basis for the next research work for the anti-wear coating on aluminum alloy. The hardness of the WC-17Co coating is about HV1100~1300, the average porosity less than 1%. And the max diameter of the single hole is less than 0.012mm. There are no apparent oxide in the coating. The WC particles occurred decarburization during the spraying process and deposited the coating that composed with W2C and Co3W3C phases. The corrosion resistance of the coating is more ideal. But the phase distribution in the coating is not enough uniform.
Photo-Oxidation of PVC-Coated Membrane Material
Authors: Yang Xu Dong , Yan Yong Sheng , Qiu Wen Can
Published: March 2013

To study photo-oxidation behavior of PVC-coated membrane material under different UV radiation intensities, three intensities of Ultraviolet (UV) irradiation were carried out. The yellowness indexes under different weathering conditions were measured, as well as UV-Vis spectrometry. Result shows that the photo-oxidation mechanism doesn’t change under different UV intensities, but the photo-oxidation reaction rates are not equal when the cumulative UV radiation energy is same. A conclusion is obtained that photo-oxidation reaction rate under different intensities is out of proportion to UV intensity. And according to Schwarzschild’s law, an equation form is established to predict material’s life.
Degradability Research of Nano-PLLA/Chitosan Composite Scaffolds
Authors: Lv Li Yong , Wang Xue Jun , Lou Tao , Sui Chong , Song Guo Jun
Published: March 2013

Nano-PLLA/chitosan scaffolds were prepared through thermally induced phase separation(TIPS). With incorporation of chitosan fibers, composites not only improved the mechanical properties of nano scaffolds, but also reduced the degradation rate of mechanical properties which deepen the applications of scaffolds better.
The Effects of Natural Dopant Acids on Morphologies and Antibacterial Activity of Polyaniline
Authors: Mu Jia Li , Fan Wen Jun , Shan Shao Yun , Hu Ting Wei , Wang Ya Ming , Jia Qing Ming
Published: March 2013

Polyaniline(PANI) doped by natural acid(citric acid, salicylic acid or rosin acid)solutions was synthesized using aniline as monomer and ammonium peroxydisulfate ((NH4)2S2O8) as oxidant. The antibacterial activities of the PANI against Gram positive bacteria(Bacillus megatherium, Bacillus subtilis, Bacillus cereus and Staphylo-coccus aureus) and Gram negative bacteria(Bacillus coli) were investigated. It was shown that PANI doped by citric acid possessed the better antibacterial activity against the selected species of Gram positive bacteria and Gram negative bacteria than PANI doped by rosin acid. PANI doped by salicylic acid exhibited ascendant antibacterial activities against Gram positive bacteria, but it has little antibacterial activity against the Gram negative bacteria.
Investigation of Au Nanoparticles Loading Temperature Responsive Hybrid Microgels
Authors: Lu Chen , Liu Xiao Yun , Zha Liu Sheng
Published: March 2013

Gold nanoparticles (Au NPs) were loaded into poly(N-isopropylacrylamide) based temperature responsive microgels by seed-growth method. Their growth process was tracked by their extinction spectra at various reaction times. Their average diameter measured by field emission transmission electron microscopy is 12 nm, and their weight content by thermogravimetric analysis is 29.2%. The localized surface plasmon resonance (LSPR) property of the loaded Au NPs changes remarkably within the same temperature range as the particle size of the hybrid microgels varys, due to variation of the refractive index surrounding the Au NPs and plasmonic coupling between them. This result indicates that the LSPR property of the Au NPs embedded within temperature responsive microgels can be tuned by environmental temperature.
Research on Microbial Degradation of Bamboo Lignin for Extraction of Natural Bamboo Fiber
Authors: Li He , Zhou Guo Ying , Liu Jian , Wang Sheng Jie
Published: March 2013

This study optimizes on the technological conditions for extraction of natural bamboo fiber by means of microbial degradation of bamboo lignin. Results show that by the orthogonal experiment, we have studied out optimal conditions for combining three strains with fermentation to produce enzyme: 10.0 g/L glucose, 0.2 g/L ammonium tartrate, 4.5 buffer solution pH value and 20.0/250 ml loading liquid quantity. In these above four factors, the primary and secondary factors affecting enzyme production are: carbon source > pH value > loading liquid quantity > nitrogen source. Meanwhile, the experiment has studied the influence of single factor on lignin degradation: at the temperature of 37 °C, about 4 x 107spore concentration, adding 1.5 mg/L veratryl alcohol and introducing air at the efflux rate of 1 L/min are bamboo crude fiber optimal conditions for microbial selective degradation of lignin.
Low-Energy Impact Damage Mechanism Analysis of FRC Laminates
Authors: Xu Ying , Wen Wei Dong , Huo Yu
Published: March 2013

Aimed at the lack of research about damage mechanism, a 3-D progressive impact damage analysis method was applied to analyze the low-energy impact damage process of T300/BMP-316 laminates with three different ply stacking sequences. The influences of ply parameters on the impact damage of laminates were researched. The impact damage mechanism was analyzed combined with the figure of impact stress in laminates. It is showed that the matrix cracking is caused by the inconsistent distortion of the matrix and fiber when the tensile stress that perpendicular to the fiber direction reaches a given value, and the delamination near to the impacted back face and front face are caused individually by the matrix cracking and the inconsistent bend stiffness between two laminas.
Sprayed Concrete – Possibilities of Testing Sprayed Concrete Prepared in Laboratory
Authors: Hubáček Adam , Hela Rudolf , Helan Tomáš
Published: March 2013

Sprayed concrete is widely applied thanks to current development of road and underground building industry. Selection of input materials, design, preparation and testing of sprayed concrete is relatively expensive because spraying machinery has to be used for application. The paper focuses on possibilities of manufacture and testing of sprayed concrete prepared in common laboratory mixer and compacted by vibration combined with defined level of pressure. This approach seems to be an alternative for initial design and testing of sprayed concrete prepared by machinery equipment.
Evaluation of Strength Characteristics of Fibre-Cement Slab Material
Authors: Melcher Jindrich , Karmazínová Marcela , Pilgr Milan
Published: March 2013

The paper summarizes the methodology and presents the evaluation of the test results of basic strength parameters, that means characteristic and design values of tensile-bending strength and modulus of elasticity of fibre-cement slabs material. The problems under consideration proceed from the probability approaches and reliability criteria for the evaluation of load-carrying components according to the limit state method. The conclusions based on material tests of actual structural parts provide for the verification and precision of the calculating and design models and also of the design resistance of structural components.
Research on Friction and Wear Properties of Ti(C,N)/Fe Composites
Authors: Li Yang , Sun Zhi Ping , Wang Rui Feng , Zou Li Yan
Published: March 2013

The effect of different load, revolving speed ,content of Ti(C,N) and sintering process on the friction coefficient and wear rate of Ti(C,N)/Fe composites was investigated systemically. Besides, the wear morphology of Ti(C,N)/Fe composites were researched with an environment scanning electron microscopy(SEM),and the phase composition were studied by X-ray diffraction(XRD).The research shows that the wear mechanism of Ti(C,N)/Fe composites are abrasive wear and adhesive wear.
Analysis of Nanocrystal of Porous Silicon with High-Resolution Transmission Electron Microscopy
Authors: Lu Jing Mei , Cheng Xuan
Published: March 2013

The porous silicon samples were prepared with n(111) Si wafers by electrochemical polarization and their microstructures were characterized by high-resolution transmission electron microscopy (HRTEM). The DigitalMicrograph image processing was used to analyze the HRTEM images. The distorted Si (111) crystal plane was observed on porous silicon and could be distinguished with the Fourier transforming electron diffraction (ED) pattern. Grain boundaries were presented in the HRTEM images where the lattice fringes distortions took place. The anisotropy property could be preserved at a small location area because of the smaller nanocrystals in different directions appeared amorphous in the ED pattern at a larger range.
Grind Cullet and Silicate Coatings
Authors: Šnirch Zdeněk
Published: March 2013

Pursuant to evaluations obtained at solving this topics in 2010, when was successfully supplied filler at acrylate coatings with grind cullet (waste glass), was chosen referential mixtures of silicate coatings with optimum quality. In Those choice mixtures was made a filler modification by various quantity of the cullet. Used cullet is from crushed glass bottle, that can’t be used for recyclation no more. Filler modification was provided so, to the new filler mixtures was approximate to ideal grading curve. The sieve analysis of original filler materials was made and after comparison of the results were proposed mixtures of new modified mixtures of filler. These then was further analysed and modified. The basic characteristic that was on modifying materials monitored belongs to cohesion with basis, consistence, vapour diffusion and smash strength. Considering absence of coatings surface quality classification Methodist in Czech prescriptions, was for the work needs created a personal methodology for classification coatings surface quality classification.
The RPR Group in Mechanism Analysis and Design System
Authors: Li Xiao Jiang , Xi Ying , Wang Xing
Published: March 2013

This article introduces the solving principle of equation of motion and reaction of kinematic pair of RPR group, in a self-developed system for the analysis and design of mechanism,(which is called MAD for short). It takes guide-bar mechanism as an example to introduce the constructing process of mechanism in MAD system, and exports the calculating results as curves.
J-Integral Evaluation for Calculating Structural Intensity and Stress Intensity Factor Using Commercial Finite Element (FE) Solutions
Authors: Hu Jong Wan
Published: March 2013

This report is mainly performed to investigate finite element (FE) modeling and post-processing capacities for fracture mechanics analyses characterized by the stress intensity factor (SIF) at successively stationary crack tip positions. As part of a linear elastic fracture mechanics (LEFM) analysis, the determination of stress intensity factor distribution can also be adopted by J-integral approach. The aim of this report is to review three papers related to estimate J-integrals through FE study and represent the theoretical backgrounds. Furthermore, the technical details for both FE modeling and SIF evaluation will be described in this report based on complete understanding of three reference papers. These numerical approaches to deal with SIF evaluation of general cracks can be applied in 2D and 3D FE models.