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Online since: September 2014
Authors: Alexandr Mayor, Oleg Bukin, Dmitriy Proschenko, Sergey Golik, Irina Postnova, Yuri Shchipunov, Y.N. Kulchin
Influence of different additives on nonlinear optical properties such media is considered.
Different synthesis method and variation of components are used to achieve the required optical properties.
At the same time the formation of certain molecular chains at the atomic level in a given configuration significantly affects the nonlinear optical properties of the material.
It this allows to significantly improve nonlinear optical properties of medium [1-3].
The density of network, thickness of fibers, mechanical properties of synthesized materials depend on the type and concentration of the macromolecules.
Different synthesis method and variation of components are used to achieve the required optical properties.
At the same time the formation of certain molecular chains at the atomic level in a given configuration significantly affects the nonlinear optical properties of the material.
It this allows to significantly improve nonlinear optical properties of medium [1-3].
The density of network, thickness of fibers, mechanical properties of synthesized materials depend on the type and concentration of the macromolecules.
Online since: December 2014
Authors: Wiwat Pichayakorn, Panupong Puttarak, Kanchana Sripoka, Khwanrudee Chaimud, Pharkphoom Panichayupakaranant
Gel of aloe vera also exhibits good wound healing properties [3].
Tensile strength and elasticity: Mechanical properties were performed on a tensile testing machine (Narin Instument, Thailand, equipped with the software version 3.9) with a crosshead speed controlled at 10 mm/minute and a 100 kg loaded cell [5].
The physical properties of these films were shown in Table 1.
All film formulas exhibited good film properties at initial time.
These films exhibited the good properties in strength, elasticity, adhesiveness and hydrophilicity properties.
Tensile strength and elasticity: Mechanical properties were performed on a tensile testing machine (Narin Instument, Thailand, equipped with the software version 3.9) with a crosshead speed controlled at 10 mm/minute and a 100 kg loaded cell [5].
The physical properties of these films were shown in Table 1.
All film formulas exhibited good film properties at initial time.
These films exhibited the good properties in strength, elasticity, adhesiveness and hydrophilicity properties.
Online since: January 2005
Authors: Ki Bae Kim, Eui Pak Yoon, Jung Pyung Choi, T.W. Nam, Joon Pyo Park
Introduction
The control of the morphology and the size of the Si phase in Al-Si casting alloy has become the
most important factor for deciding the characteristics of the alloy.
In this research, an electromagnetic vibration was applied to a solidifying Al-Si-Mg alloy and then the morphology and size of the eutectic Si phase were observed and its mechanical properties were measured.
A tensile test was carried out to evaluate the mechanical properties of the specimen at room temperature by using the specimen of ASTM E8M standard size.
It has been noted that the vibration phenomenon due to a low frequency does not affect the modification of the eutectic Si phase.
The mechanical properties of the electromagnetically vibrated alloy were increased as increasing frequencies due to the fine size and modification of the eutectic Si phase.
In this research, an electromagnetic vibration was applied to a solidifying Al-Si-Mg alloy and then the morphology and size of the eutectic Si phase were observed and its mechanical properties were measured.
A tensile test was carried out to evaluate the mechanical properties of the specimen at room temperature by using the specimen of ASTM E8M standard size.
It has been noted that the vibration phenomenon due to a low frequency does not affect the modification of the eutectic Si phase.
The mechanical properties of the electromagnetically vibrated alloy were increased as increasing frequencies due to the fine size and modification of the eutectic Si phase.
Online since: December 2014
Authors: Kasper Górny, Wiesław Zwierzycki, Przemysław Tyczewski
Tribological properties of mixtures containing new ecological refrigerants with compatible lubricants should be examined.
Hence, the viscosity and solubility of refrigerant–lubricant mixtures are the important factors in determining their suitability for specific applications, and in particular, for predicting reliable oil return.
Table 1 shows typical properties of testing oils.
Properties of testing oils Oil type Property Viscosity [mm2/s] Viscosity index Flash point [oC] Pour point [oC] 40 oC 100 oC Synthetic POE 32 5.8 115 236 -48 Synthetic POE 68 8.7 95 230 -36 The refrigeration oil should show good miscibility with refrigeration gas in order to achieve compressor lubrication and oil recovery in the refrigeration cycle.
Attempts should be made to examine tribological properties of mixtures of new ecological refrigerants with compatible lubricants.
Hence, the viscosity and solubility of refrigerant–lubricant mixtures are the important factors in determining their suitability for specific applications, and in particular, for predicting reliable oil return.
Table 1 shows typical properties of testing oils.
Properties of testing oils Oil type Property Viscosity [mm2/s] Viscosity index Flash point [oC] Pour point [oC] 40 oC 100 oC Synthetic POE 32 5.8 115 236 -48 Synthetic POE 68 8.7 95 230 -36 The refrigeration oil should show good miscibility with refrigeration gas in order to achieve compressor lubrication and oil recovery in the refrigeration cycle.
Attempts should be made to examine tribological properties of mixtures of new ecological refrigerants with compatible lubricants.
Online since: December 2012
Authors: Rui Tang
Sliding Mode Control Scheme for Tele-Operation Manipulator
Rui Tang
School of Mechanical & Electrical Engineering, Pan-zhihua University, Jichang Road No.10, Sichuan, Panzhihua617000, China
School of Manufacturing Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu61065, China
apzhutr@163.com,
Keywords: Master and Slave Manipulator; Sliding Mode Control; Chattering; Reaching Law; Simulation;
Abstract.
Considering that the quality and stability of servo system will be affected by the chattering phenomenon in the SMC, a reaching law approach was used to reduce the chattering phenomenon.
Because of the chattering, the property of servo system will be damaged [5].
By the paper [7], the time delay switch, space delay switch, system inertia and other factors result in chattering.
Considering that the quality and stability of servo system will be affected by the chattering phenomenon in the SMC, a reaching law approach was used to reduce the chattering phenomenon.
Because of the chattering, the property of servo system will be damaged [5].
By the paper [7], the time delay switch, space delay switch, system inertia and other factors result in chattering.
Online since: January 2011
Authors: Yong Kang Zhang, Chao Jun Yang, Chun Song Guan, Jian Jun Zhuang, Tao Ni
No-excess block construction in oil drilling platform Sevan Driller
Zhang Yongkang1, a, Yang Chaojun1, b, Guan Chunsong1, c, Ni Tao2, d and Zhuang Jianjun2, e
1School of Mechanical Engineering, Jiangsu University, Zhenjiang, China, 212013
2 Cosco (Nantong) Shipyard Co., Ltd, Nantong, China, 226006
aykzhang@ujs.edu.cn, byangchaojun@ujs.edu.cn, ccs.guan@163.com,
dnitao@ cosco-shipyard.com, ezhuangjianjun@cosco-shipyard.com
Keywords: No-excess construction, hull blocks, accuracy control, compensation, shipbuilding
Abstract.
In the manufacturing stage, the factors affecting the block accuracy include plate-cutting, plate alignment, marking, assembling and welding.
The introduction of drilling platform Sevan Driller The drilling platform Sevan Driller, which is the first cylinder marine drilling platform in the world, the first 6th-generation semi-submersible marine drilling platform that is developed independently and owned the independent intellectual property rights by China.
Accuracy control of ship hull construction should be considered from the design stage to the manufacturing stage because the steel plate has many factors associated with distortion, which is implemeted in the whole process of the hull construction.
In the manufacturing stage, the factors affecting the block accuracy include plate-cutting, plate alignment, marking, assembling and welding.
The introduction of drilling platform Sevan Driller The drilling platform Sevan Driller, which is the first cylinder marine drilling platform in the world, the first 6th-generation semi-submersible marine drilling platform that is developed independently and owned the independent intellectual property rights by China.
Accuracy control of ship hull construction should be considered from the design stage to the manufacturing stage because the steel plate has many factors associated with distortion, which is implemeted in the whole process of the hull construction.
Online since: April 2008
Authors: Lei Gang Wang, Feng Jian Shi
The material deformation is affected by die geometry, material
behavior, friction and back pressure.
Introduction Ultra-fine grained materials have been widely investigated due to its unique mechanical (such as high specific strength and ductility) and physical properties.
Corner gap is a main factor causing strain inhomogeneity along the cross-section of the billet [13].
Since strain affects the microstructure in the material, homogeneity of strain across the cross-section of an extruded billet is very important.
Introduction Ultra-fine grained materials have been widely investigated due to its unique mechanical (such as high specific strength and ductility) and physical properties.
Corner gap is a main factor causing strain inhomogeneity along the cross-section of the billet [13].
Since strain affects the microstructure in the material, homogeneity of strain across the cross-section of an extruded billet is very important.
Online since: May 2014
Authors: Xu Dong Jin, Jun Ma, Yong Zhi Zhang
CRH2 type EMU was taken for example to discusses the important principles of ecological design from aspects of environment factors, modern humane ecological design, design methods and material technology.
Ecological design means environmental factors should be contained in the design, which can be used to determine the direction of design decisions.
Ecological measures and ecological factors of the design could be determined better according to a number of different external factors.
(c) Perfect property of anticorrosion can omit the coating design for the body.
The key of optimizing design process, using material or energy reasonably, minimizing the negative effect on the environment as well as human health, is the systematic analysis of the external factors that affect the product life cycle.
Ecological design means environmental factors should be contained in the design, which can be used to determine the direction of design decisions.
Ecological measures and ecological factors of the design could be determined better according to a number of different external factors.
(c) Perfect property of anticorrosion can omit the coating design for the body.
The key of optimizing design process, using material or energy reasonably, minimizing the negative effect on the environment as well as human health, is the systematic analysis of the external factors that affect the product life cycle.
Online since: September 2014
Authors: Yan Sheng, Shi Xin Liu, Q. Rong
Entering the near-fault vertical seismic waves, the affect of isolation layer parameters and earthquake intensity on the isolation effect is studied.
In the high-intensity areas, isolation building reduces horizontal earthquake action, the vertical earthquake action may become the main controlling factor of structural response, it reduces the structural security.
Currently, the disk spring has been widely used in mechanical vibration and shock-absorbing devices, the cross-section of single disk spring is shown in Fig.1.
The vertical stiffness formula of the rubber isolation bearings[3] (2) Where, D is the diameter, S2 is the second shape factor, Ecb is the performance elastic constants.
Example analysis 3.1 Computational model The vertical damping properties of series isolation system under near-fault earthquake is investigated.
In the high-intensity areas, isolation building reduces horizontal earthquake action, the vertical earthquake action may become the main controlling factor of structural response, it reduces the structural security.
Currently, the disk spring has been widely used in mechanical vibration and shock-absorbing devices, the cross-section of single disk spring is shown in Fig.1.
The vertical stiffness formula of the rubber isolation bearings[3] (2) Where, D is the diameter, S2 is the second shape factor, Ecb is the performance elastic constants.
Example analysis 3.1 Computational model The vertical damping properties of series isolation system under near-fault earthquake is investigated.
Online since: December 2014
Authors: Lu Liu
Cost plan, as it was, is a form of the target cost.
1.3The cost control
Cost control is to point to in the construction process, the factors which influence the construction cost management, and take various effective measures, will actually happened in the construction of various consumption and expenditure strictly controlled within the scope of the cost plan, ready to reveal and timely feedback, whether accord with a standard strict censorship of various charges, to calculate the difference between actual cost and planned cost and is analyzed, and then take various measures to eliminate the construction waste phenomenon of the loss.
2.Completes the cost forecast, cost control target
2.1Engineering, material, cost prediction
1)First analysis of the project by the labor of the unit price, and then analysis of the workers' wages and social labor market, according to the time limit for a project and analysis of the number of people ready to put the project in the contract price
whether labor encase. 2)Materials proportion of take a fee, should be accurately as a focus, respectively, to advocate material, materials, auxiliary materials, other materials item by item analysis, the supply of the material location, purchase price, shipping and handling charges, analysis norm the materials specified in the specifications of different specifications and actual use of materials, comparing the actual USES the mixing ratio of cement dosage and the fixed amount differences, meta-analysis of the other materials of the budget, in the concrete practice to mix a certain amount of additive, etc. 3)Machinery use fee: bidding group model of mechanical equipment, number is generally adopts the norm to work out the construction method of a certain differences with the actual construction site, with the efficiency also have different, so to measure the actual machine disbursement is going to happen.
The main machinery shall be affecting production quota. 2.2Construction plan of the change of the cost forecast After the bid of the project, must be combined with the actual situation of the construction site to establish advanced technically feasible and the implementation of the economic and reasonable construction organization design, combined with the economic and natural geographical conditions of the project location, construction technology, equipment selection and arrangement of the actual situation of the time limit, more sexually shy group adopted by the construction method and the difference of bid preparation, or with the norm of different construction methods, as to make the correct prediction according to solid. 2.3The prediction of auxiliary construction cost Auxiliary refers to the bill of quantities of quantities or no given in the design drawings, and is indispensable in the construction, such as: concrete mixing station, the tunnel construction in the three tube
From the employment quantity control, targeted to reduce or shorten the man-days consumption of certain jobs, thereby reducing consumption of man-days, control engineering cost. 2)The material cost control Materials of general project total cost 65% ~ 75%, and directly affects project cost and economic benefits.
Intellectual property press, 2003
whether labor encase. 2)Materials proportion of take a fee, should be accurately as a focus, respectively, to advocate material, materials, auxiliary materials, other materials item by item analysis, the supply of the material location, purchase price, shipping and handling charges, analysis norm the materials specified in the specifications of different specifications and actual use of materials, comparing the actual USES the mixing ratio of cement dosage and the fixed amount differences, meta-analysis of the other materials of the budget, in the concrete practice to mix a certain amount of additive, etc. 3)Machinery use fee: bidding group model of mechanical equipment, number is generally adopts the norm to work out the construction method of a certain differences with the actual construction site, with the efficiency also have different, so to measure the actual machine disbursement is going to happen.
The main machinery shall be affecting production quota. 2.2Construction plan of the change of the cost forecast After the bid of the project, must be combined with the actual situation of the construction site to establish advanced technically feasible and the implementation of the economic and reasonable construction organization design, combined with the economic and natural geographical conditions of the project location, construction technology, equipment selection and arrangement of the actual situation of the time limit, more sexually shy group adopted by the construction method and the difference of bid preparation, or with the norm of different construction methods, as to make the correct prediction according to solid. 2.3The prediction of auxiliary construction cost Auxiliary refers to the bill of quantities of quantities or no given in the design drawings, and is indispensable in the construction, such as: concrete mixing station, the tunnel construction in the three tube
From the employment quantity control, targeted to reduce or shorten the man-days consumption of certain jobs, thereby reducing consumption of man-days, control engineering cost. 2)The material cost control Materials of general project total cost 65% ~ 75%, and directly affects project cost and economic benefits.
Intellectual property press, 2003