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The Area Comparison of LCC-HVDC and VSC-HVDC
Jiang Haibo,
Fang Jing,
Zhang Tao,
Fan Xiaomu
Issue:
Volume 5, Issue 7, December 2017
Pages:
502-508
Received:
27 December 2017
Published:
28 December 2017
Abstract: With the mature of high power IGBT, VSC-HVDC technique is gradually adopted in principle power grid with higher voltage and capacity. At present, it is generally considered that compared with traditional HVDC technique, VSC-HVDC will save lots of land resources. However, it is not always the case. In this paper, two recent projects are used to compare the area between LCC-HVDC and VSC-HVDC. The factors which affect the area of LCC-HVDC converter station and VSC-HVDC converter station are analyzed. Generally, with the improvement of DC voltage, the advantage of VSC-HVDC for land saving would gradually decrease. The comparison between the area of LCC-HVDC and VSC-HDVC is mainly depend on DC rate Voltage, the nominal AC voltage, the account of groups for AC filter, etc.
Abstract: With the mature of high power IGBT, VSC-HVDC technique is gradually adopted in principle power grid with higher voltage and capacity. At present, it is generally considered that compared with traditional HVDC technique, VSC-HVDC will save lots of land resources. However, it is not always the case. In this paper, two recent projects are used to comp...
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Study on the Monitoring and Guidance of Public Opinion of Micro-Blog Based on Complex Network in Colleges and Universities
Issue:
Volume 5, Issue 7, December 2017
Pages:
509-514
Received:
27 December 2017
Published:
28 December 2017
Abstract: With the advent of the information age, the Internet has become the most important platform for people to express their opinions and attitudes toward public affairs or hot emergencies. Micro-blog public opinion has become the most influential network of public opinion of the means of transmission, with a short time, a wide range of communication features. Based on the analysis of complex network characteristics and network public opinion, this paper analyzes the complex network topological properties of complex network using the statistical properties of complex networks, the number of nodes, the point intensity and the average weighted clustering coefficient. Choosing "heat" and "situation" "And other indicators and node number, degree distribution and average weighted clustering coefficient of these three complex network parameters to achieve one-to-one mapping, and network life cycle of public opinion four-stage characteristics of building an emergency network public opinion monitoring and guidance model, public opinion real-time Monitoring, to determine the appropriate public opinion to guide the strategy. The actual public opinion monitoring and guidance through actual cases and real data verify the feasibility of the network public opinion monitoring and guidance model.
Abstract: With the advent of the information age, the Internet has become the most important platform for people to express their opinions and attitudes toward public affairs or hot emergencies. Micro-blog public opinion has become the most influential network of public opinion of the means of transmission, with a short time, a wide range of communication fe...
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The Preparation and Experimental Research for Inner Cladding Casting of Al-Al
Zeng Li-kui,
Yang Ping,
Wang Yajun
Issue:
Volume 5, Issue 7, December 2017
Pages:
515-518
Received:
28 December 2017
Published:
28 December 2017
Abstract: With the rapid development of science and technology, the unceasing enhancement of component integration degree, and the increasingly demanding of parts using conditions, the part that the traditional metal materials and alloy materials preparation is hard to meet the requirements of the use of some special conditions, so the new composite materials have been paid attention to by the countries all over the world. An casting method for Inner Cladding Casting was introduced. By the use of this method, the Al-Al inner cladding casting which has the transition layer in the middle was prepared, it was indicated that the casting method for inner cladding casting has the feasibility. Through the soaking experiments of three group samples which were Arc Spraying Al layer、substrate of Al and Inner Cladding Casting of Al-Al, we find out that by 140h soaking experiments for inner cladding casting of Al-Al the porosity change was little and it had shown very good corrosion resistant effect.
Abstract: With the rapid development of science and technology, the unceasing enhancement of component integration degree, and the increasingly demanding of parts using conditions, the part that the traditional metal materials and alloy materials preparation is hard to meet the requirements of the use of some special conditions, so the new composite material...
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Efficent Synthesis of 5-(4-(2,3,4,6-Tetra-O-acetyl-β-D-glucopyranosyl))benzylidene-2,2-dimethyl-1,3-dioxane-4,6-dione Derivatives
Issue:
Volume 5, Issue 7, December 2017
Pages:
519-523
Received:
28 December 2017
Published:
28 December 2017
Abstract: Objective Synthesis of gastrodin intermediate 4-formylphenyl(2,3,4,6-O-tetraacetyl)-β-D-glucoside analogues. Methods 5-(4-(2,3,4,6-Tetra-O-acetyl-β-D-glucopyranosyl)) benzylidene-2,2-dimethyl-1,3-dioxane-4,6-dione derivatives were synthesized by the Knoevenagel reaction of self-made 4-formylphenyl(2,3,4,6-O-tetraacetyl)-β-D-glucoside and 2,2-dimethyl-1,3-dioxane -4,6-dione in the presence of N-methylimidazole trifluoromethyl sulfonate. Results and conclusions five products of gastrodin intermediate analogues characterized by NMR and MS(ESI). The reaction has the advantages of high yields(76%～84%), mild conditions, simple operation and environmental friendliness. N-methylimidazole trifluoromethyl sulfonate could be recycled and reused several times without significant loss of its efficiency.
Abstract: Objective Synthesis of gastrodin intermediate 4-formylphenyl(2,3,4,6-O-tetraacetyl)-β-D-glucoside analogues. Methods 5-(4-(2,3,4,6-Tetra-O-acetyl-β-D-glucopyranosyl)) benzylidene-2,2-dimethyl-1,3-dioxane-4,6-dione derivatives were synthesized by the Knoevenagel reaction of self-made 4-formylphenyl(2,3,4,6-O-tetraacetyl)-β-D-glucoside and 2,2-dimeth...
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The Lubricity of Polyvinyl Alcohol and Nano-silica Hydrogel’s Scaffold Fabricated by 3D Printing
Zhang Yikun,
Wang Hui,
Li Xuefeng
Issue:
Volume 5, Issue 7, December 2017
Pages:
524-528
Received:
28 December 2017
Published:
28 December 2017
Abstract: Hydrogel is a macromolecule three-dimensional network made of hydrophilic polymers, which is soft and has good elasticity. Hydrogels have a wide range of potential applications in tissue engineering, drug delivery and biosensors. In this paper can be applied to a biomedical polymer material polyvinyl alcohol as matrix, according to the first forming crosslinking method, using 3D printing to make SiO2/PVA sol forming, and then freeze-melt cross-linking treatment to prepare a physically cross-linked three-dimensional network hydrogel scaffold. The further study found that hydrogel scaffold has high mechanical strength and fine internal structure, the compressive modulus of the hydrogel scaffold can reach more than 2.4 times that of the bulk polyvinyl alcohol hydrogel, and the compression of the scaffold Modulus decreases with increasing porosity of the stent. The tribological properties of the scaffolds show that the scaffold has high lubricity and good stability when rubbed repeatedly, due to the double network hydrogel scaffold has good biological compatibility and adhesion properties, cell culture, cells found on the inner wall of the stent porosity can better growth.
Abstract: Hydrogel is a macromolecule three-dimensional network made of hydrophilic polymers, which is soft and has good elasticity. Hydrogels have a wide range of potential applications in tissue engineering, drug delivery and biosensors. In this paper can be applied to a biomedical polymer material polyvinyl alcohol as matrix, according to the first formin...
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Study on Blending Modification of Metallocene Linear Low Density Polyethylene
Qiu Di,
Xu Heng,
Wang Peng,
Li Xuefeng,
Long Shijun
Issue:
Volume 5, Issue 7, December 2017
Pages:
529-533
Received:
28 December 2017
Published:
28 December 2017
Abstract: In recent years, with the rapid development of China's wire and cable industry, optical cable demand gradually increased, but the wire and cable water resistance is not good, and vulnerable to corrosion caused by the distortion of the optical signal, so the cable aluminum-plastic composite belt should be born. In this study, The aluminum-plastic composite tapes were hot-pressed with low density polyethylene (LDPE) or metallocene linear low density polyethylene (MLLDPE) and high density polyethylene (HDPE) to test their heat sealing strength and mechanical properties. The rheological study shows that the HDPE/MLLDPE blends and HDPE/LDPE blends have a linearity in the lgG'-lgω curve in the low frequency region, and the heterogeneous system is in the molten state. The tanδ value of the blends gradually increased with the increase of the MLLDPE content, which indicated that the viscosity of the blends became higher, which improved the process ability of blends. The TGA blend shows that HDPE has better heat resistance. The melting point of HDPE in HDPE/MLLDPE blends decreased with the increase of MLLDPE content, which indicated that the two had mechanical compatibility. In the HDPE/ LDPE blends, two melting peaks were found, which indicated that the HDPE and LDPE had different crystal structure compatibility, and they were more likely to crystallize separately.
Abstract: In recent years, with the rapid development of China's wire and cable industry, optical cable demand gradually increased, but the wire and cable water resistance is not good, and vulnerable to corrosion caused by the distortion of the optical signal, so the cable aluminum-plastic composite belt should be born. In this study, The aluminum-plastic co...
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Mechanical Properties of Hybrid Double Crosslinked Hydrogel Regulated by Sodium Chloride Solution
Shu Mengmeng,
Zhao Youjiao,
Long Shijun,
Li Xuefeng
Issue:
Volume 5, Issue 7, December 2017
Pages:
534-537
Received:
28 December 2017
Published:
28 December 2017
Abstract: Polymer hydrogels are a type of soft and wet materials with three-dimensional network structure, large water content and hydrophilicity. It plays a very important effect in the human tissue engineering because it has some excellent characteristics as human active tissue. In this study, physical/chemical hybrid cross-linked hydrogels were prepared by "one-pot" method, and the mechanical properties of hydrogels were effectively controlled by immersing in different concentration of sodium chloride solution. The tensile strength of the hydrogels can be increased from 0.1 MPa to 1.8 MPa by the controlling the concentration of the sodium chloride solution, and the elongation at break increased from 770.3% to 1320.9%. It was found that the hybrid cross-crosslinked hydrogels has good self-healing properties. Put the cut gels section together, it can be self-healing, and the elongation at break of healing the gels was restored to the original gels of the 30%. Therefore, this high ionic content of the hydrogels have excellent performance in the human cartilage materials, medical materials and electrical properties. The hybrid dual crosslinked hydrogels has excellent overall properties, which are characterized by high-strength hydrogels obtained from polyelectrolytes and "high ionic solutions". So it is of potential value in the application of high performance ionic conductive hydrogels.
Abstract: Polymer hydrogels are a type of soft and wet materials with three-dimensional network structure, large water content and hydrophilicity. It plays a very important effect in the human tissue engineering because it has some excellent characteristics as human active tissue. In this study, physical/chemical hybrid cross-linked hydrogels were prepared b...
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Study on Anti-scaling Measures in Pipelines of Geothermal Power Station
Zheng Shangji,
Pacelli Zitha
Issue:
Volume 5, Issue 7, December 2017
Pages:
538-544
Received:
28 December 2017
Published:
28 December 2017
Abstract: In order to study the problem of scaling in pipeline during the development of hydrothermal geothermal resources, geothermal water in Fengshun area is selected as the research subject. The scaling tendency of geothermal water was analyzed through the analysis of water quality and scaling components, and the best scaling inhibitor was selected. The Larson index (LI) and Ryzner index (RI) analysis showed that the geothermal water has a slight scaling tendency. The results of XRD and Micro-CT showed that the main content is CaCO3 (99.8%). PASP and PESA were chosen to conduct scaling inhibition analysis. At 90°C and 8 h, the scaling inhibition rate of PASP and PESA can reach to 91.3% and 90.1% at the concentration of 15 mg/L, which can meet the practical demand. In view of the high price and poor economy of PASP, it is suggested that PESA be chosen as the green environmental protection scaling inhibitor for this type of geothermal water.
Abstract: In order to study the problem of scaling in pipeline during the development of hydrothermal geothermal resources, geothermal water in Fengshun area is selected as the research subject. The scaling tendency of geothermal water was analyzed through the analysis of water quality and scaling components, and the best scaling inhibitor was selected. The ...
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A Study of the Model of Street Corner Space in the Central District of Chicago
Issue:
Volume 5, Issue 7, December 2017
Pages:
545-553
Received:
28 December 2017
Published:
28 December 2017
Abstract: Urban street corner space, as an indispensable part of urban public space, plays a positive and effective role in improving urban quality and vitality because of its extensive penetration and accessibility. In this paper, the central area of Chicago street corner space as the research object, through field investigation and theoretical analysis, summed up the characteristics and layout of Chicago street corner space characteristics. On the basis of summarizing four kinds of layout mode of the central area of Chicago street corner space, we conclude that they are building corner cutting type, bottom retreat type, leisure recreation type and landscape park type, and each model is discussed in detail. The final review and sort out the research Chinese corner space, combined with the Chicago street corner space mode, puts forward three suggestions on the construction of China corner space: space partition refinement and enhance the quality of the corner, implantation of multiple functions and activate the corner activity, integrating characteristic elements and show the style of the corner.
Abstract: Urban street corner space, as an indispensable part of urban public space, plays a positive and effective role in improving urban quality and vitality because of its extensive penetration and accessibility. In this paper, the central area of Chicago street corner space as the research object, through field investigation and theoretical analysis, su...
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Study on the Planning Strategies of Urban Street Open Space Constrained by the Environment in Winter City
Zhiqing Zhao,
Liu Cong,
Jiajun Hu,
Yanyan Zhao
Issue:
Volume 5, Issue 7, December 2017
Pages:
554-560
Received:
28 December 2017
Published:
28 December 2017
Abstract: Street open space, as a necessary place for residents to conduct interpersonal interaction in the city, serves as an important space for people to exchange material, energy and information with nature. In Harbin, a winter city, Dasongbei area, as a newly built zone, leads the strategic forefront in promoting new urbanization, whose open space has drawn increasing attention in its environmental construction. This paper summarizes four planning modes of street open space and some existing problems through field investigation and interview for Dasongbei area, such as inadequate consideration on citizen demands, neglect of weather factors in winter cities, monotonous plant landscape, etc. Under regional environment context, combining with the influence of the cold climatic elements on the street open space construction, this paper puts forward suitable and sustainable planning strategies of street open space so as to guide the planning and design of street open space in other winter cities.
Abstract: Street open space, as a necessary place for residents to conduct interpersonal interaction in the city, serves as an important space for people to exchange material, energy and information with nature. In Harbin, a winter city, Dasongbei area, as a newly built zone, leads the strategic forefront in promoting new urbanization, whose open space has d...
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Study on Popularization and Application of Bamboo in Interior Design of Chinese Architecture
Zhang Xiang,
Wang Chenchao
Issue:
Volume 5, Issue 7, December 2017
Pages:
561-564
Received:
28 December 2017
Published:
29 December 2017
Abstract: This paper analyzed the advantages of bamboo from the perspective of interior design, summarized the application and ecological value of bamboo, and explored the feasibility and method of applying bamboo in modern interior design of China. It aimed to popularize the use of bamboo in interior design of Chinese Architecture. Finally, we can achieve the purpose of saving resources and protecting the environment by substituting bamboo for wood and substituting bamboo for steel.
Abstract: This paper analyzed the advantages of bamboo from the perspective of interior design, summarized the application and ecological value of bamboo, and explored the feasibility and method of applying bamboo in modern interior design of China. It aimed to popularize the use of bamboo in interior design of Chinese Architecture. Finally, we can achieve t...
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Thinking Establishment and Diagram Expression of Green Architecture Design
Zhou Zhongkai,
Liu Changan,
Zhao Jilong
Issue:
Volume 5, Issue 7, December 2017
Pages:
565-571
Received:
28 December 2017
Published:
29 December 2017
Abstract: As the important way of information visualization, diagram is an efficient approach in analyzing and expressing the thinking process and achievement of green architecture design, as a result, establishing the diagram system and expression methodology could make a great contribution to optimize design process, convenient thinking communication as well as structure design methodology. Through discussion of green architecture thinking process and expression system, as a field which contains complex design elements and evaluation criteria, green architecture design needs the logic thinking and systematic expression system by applying visual diagramming language. Furthermore, through analyzing green architecture design case, this paper could further analyze the relationship among architecture design, thinking construction and diagram expression, and illustrates that diagram will offer systematic logic and methodology for the green architecture design and teaching, which finally reaches the combination between rationality and sensibility, abstraction and concretization, form and technology.
Abstract: As the important way of information visualization, diagram is an efficient approach in analyzing and expressing the thinking process and achievement of green architecture design, as a result, establishing the diagram system and expression methodology could make a great contribution to optimize design process, convenient thinking communication as we...
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Study on Office Building Window Design Strategy in Severe Cold Region Based on Daylight Comfort
Issue:
Volume 5, Issue 7, December 2017
Pages:
572-578
Received:
28 December 2017
Published:
29 December 2017
Abstract: Effective and reasonable daylight can create a comfortable and healthy lighting environment, and significantly affect the quality of indoor light environment in office buildings. Reasonable architectural form design can improve indoor light environment quality and visual comfort degree, and has great significance. Combining with light climate characteristics in severe cold region, the study based on parametric model, aims to analyze the influence degree of the window-wall ratio, glass transmittance and window shape on lighting comfort of westward office buildings. Taking a westward office building in Harbin as an example, Rhino & Grasshopper is used to establish the parametric simulation model. Using different conditions of Window-Wall Ratio (WWR), Window Height (WH) and Height-Width Ratio (H/W) as variables to calculate the value of Daylight Factors (DF) and Daylight Discomfort Probability (DGP) through the control variable method. Adopting the regression analysis, the correlation between above three exterior window variables and the lighting comfort degree is studied, and the optimal design strategies for lighting environment of western office buildings in severe cold region are summarized. The results show that when the WWR is 0.2-0.3, the daylight comfortable performance is the best, the WH is about 0.9 and W/H is between 0.4-0.8, the office building has better daylight comfortable quality.
Abstract: Effective and reasonable daylight can create a comfortable and healthy lighting environment, and significantly affect the quality of indoor light environment in office buildings. Reasonable architectural form design can improve indoor light environment quality and visual comfort degree, and has great significance. Combining with light climate chara...
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Research on Adjacent Neighbourhood Planning of a University Campus---A Case Study on South China University of Technology
Issue:
Volume 5, Issue 7, December 2017
Pages:
579-586
Received:
28 December 2017
Published:
29 December 2017
Abstract: The surrounding block of college and university is an important interface between campus and city, which does not only play an important role in industrial agglomeration, but also is closely linked to the surrounding traffic system and landscape environment. This paper analyzes Wushan Street, which is located around South China University of Technology as a case. By using the relevant theory and investigating Wushan Street, the paper analyzes and summarizes the cultural background of the region, industry function, traffic function and space function. Furthermore, the aim of this research paper is to put forward existing problems and corresponding countermeasures, strengthening the function of industrial incubation, improving traffic efficiency and making landscape environment better, in order to harmonize development between campus, university district and city.
Abstract: The surrounding block of college and university is an important interface between campus and city, which does not only play an important role in industrial agglomeration, but also is closely linked to the surrounding traffic system and landscape environment. This paper analyzes Wushan Street, which is located around South China University of Techno...
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Tool Development of Construction Project Auxiliary Green Land Area Audit Based on AutoCAD .NET API
Liu Yanmin,
Zheng Hui,
Ma Xiaokang
Issue:
Volume 5, Issue 7, December 2017
Pages:
587-591
Received:
28 December 2017
Published:
29 December 2017
Abstract: The scheme of construction project is joint approved by planning department and landscape department in Wuhan. The planning green land ratio of the construction project must achieve the standard of auxiliary green land ratio. During the auxiliary green land audit, the area of all the green land entity in the planning map is classified according to different conversion factors. This paper has developed an adult tool for Construction project auxiliary green land area based on AutoCAD .NET API. Take advantage of this tool the classification and statistics of all kinds of green land entity can quickly and accurately complete, greatly reducing the workload of manual statistics and improving the accuracy of statistics, the efficiency of supporting green area audit can also greatly improved.
Abstract: The scheme of construction project is joint approved by planning department and landscape department in Wuhan. The planning green land ratio of the construction project must achieve the standard of auxiliary green land ratio. During the auxiliary green land audit, the area of all the green land entity in the planning map is classified according to ...
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Analysis of Steel Fiber Randomly Distributed Concrete Beams Based on ABAQUS
Zhu Kangwei,
Xu Zhihong,
Cao Zhiwei,
Xu Wentao
Issue:
Volume 5, Issue 7, December 2017
Pages:
592-597
Received:
28 December 2017
Published:
29 December 2017
Abstract: In this paper, the stochastic distribution of steel fiber in concrete beam is realized by using MATLAB modeling software. Firstly, MATLAB software is used to establish random distribution of steel fibers of different number, length and position, and the steel fiber model is assembled in an embedded way with the concrete model. Then the ABAQUS software is used to carry out the three point bending monotonic loading test on the model, and the stress curves and deflection curves of different steel fiber concrete are obtained. The effect of steel fiber on tensile and crack resistance in concrete is analyzed. The effect of volume, length and location of steel fiber on stress, strain and deflection of concrete beam is studied. The results show that the increase of the volume fraction can decrease the deflection and increase the tensile strength of the material, while the length has no significant effect. The distribution can significantly affect the efficiency of the fiber.
Abstract: In this paper, the stochastic distribution of steel fiber in concrete beam is realized by using MATLAB modeling software. Firstly, MATLAB software is used to establish random distribution of steel fibers of different number, length and position, and the steel fiber model is assembled in an embedded way with the concrete model. Then the ABAQUS softw...
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Experimental Study on Construction Waste Making New Road Brick with Recycled Aggregate Concrete
Yang Jinglin,
Tang Feng,
Wan Linhui,
Fang Liang,
Ou Yangguoyuan
Issue:
Volume 5, Issue 7, December 2017
Pages:
598-602
Received:
28 December 2017
Published:
29 December 2017
Abstract: Pedestrian road paving brick is a kind of paving material. It is made of cement, stone and sand as raw material, and it is cut into stripes or squares by vibrating forming surface. According to the construction waste recycled aggregate concrete, the water cement ratio, recycled aggregate replacement rate as the main parameters, design a new type of plate nail experimental study on pedestrian road brick, road brick design has 4 panels and 6 plate nail nails, nail plate thickness were designed as 1mm, 1.5mm and 2mm. The influence of different water binder ratio and recycled aggregate replacement rate on the compressive strength and skid strength of the new pavement brick was analyzed by orthogonal test. The experimental results show that the compressive strength and slip strength of the new type of pavement brick decrease with the replacement rate of recycled aggregate concrete gradually increasing. Nail type plate relative to the compressive strength of brick without road brick plate nail is similar, but the anti slip strength increased; the nail plate thickness on pavement brick tile anti sliding strength were improved, the total efficiency coefficient is similar.
Abstract: Pedestrian road paving brick is a kind of paving material. It is made of cement, stone and sand as raw material, and it is cut into stripes or squares by vibrating forming surface. According to the construction waste recycled aggregate concrete, the water cement ratio, recycled aggregate replacement rate as the main parameters, design a new type of...
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Dynamic Response Analysis of Simply Supported Steel Beam Under Natural Fire Field Load
Tang Feng,
Yang Jinglin,
Wan Linhui,
Ou Yangguoyuan
Issue:
Volume 5, Issue 7, December 2017
Pages:
603-608
Received:
28 December 2017
Published:
7 January 2018
Abstract: The outbreak of fire has a great influence on. the carrying capacity of structure. the elastic modulus, flexural rigidity, yield strength and natural frequency of structural steel are discussed on the effects of fire temperature in this paper. The simply supported steel beam to form a plastic hinge when the ultimate moment changes in the first phase of the beam movement and the dynamic responses of simply supported steel beams under different loads were analyzed. Specific to the Q235 H-shaped steel case of H-shaped steel was calculated in high temperature structural steel bending stiffness, yield strength and natural frequency of simply supported steel beam in the two stages of movement of the dynamic response is analyzed. The analysis showed that the fire duration was 2.5h, the yield strength of steel is only 85.63N/mm2, a drop of 63.56%, while the component in the fire field in two phases dynamic deflection is also rapid growth, an increase of over 50%, almost lost capacity, in addition to members of this excessive plastic deformation is a serious cause of the damaged component. Dangerous. Therefore, in order to ensure the safety of steel structure design, the adverse effects should be taken into full consideration in the design of simply supported steel beams.
Abstract: The outbreak of fire has a great influence on. the carrying capacity of structure. the elastic modulus, flexural rigidity, yield strength and natural frequency of structural steel are discussed on the effects of fire temperature in this paper. The simply supported steel beam to form a plastic hinge when the ultimate moment changes in the first phas...
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