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Online since: February 2014
Authors: Jie Luo
They were conducted in a certain environment, constrained by economic, technological, political, and cultural factors outside the enterprise.
External Environment Factors Have Important Influence on Low-carbon Technology Innovation Activities of Petroleum Enterprises.
Internal factors determine success or failure of technological innovation of petroleum enterprises.
Through the above analysis, integrated low-carbon technology innovation process, external environment factors, internal factors , we can draw the low-carbon technology innovation system structure diagram, as shown in figure 1.
To optimize low-carbon technology innovation system for oil companies also mainly revolves some key internal factors, e.g., building research and development organizations, inputting innovation resource factors, and optimizing technical innovation security mechanism and operational mechanism, tec.
External Environment Factors Have Important Influence on Low-carbon Technology Innovation Activities of Petroleum Enterprises.
Internal factors determine success or failure of technological innovation of petroleum enterprises.
Through the above analysis, integrated low-carbon technology innovation process, external environment factors, internal factors , we can draw the low-carbon technology innovation system structure diagram, as shown in figure 1.
To optimize low-carbon technology innovation system for oil companies also mainly revolves some key internal factors, e.g., building research and development organizations, inputting innovation resource factors, and optimizing technical innovation security mechanism and operational mechanism, tec.
Online since: September 2014
Authors: Hua Shan Yang, Yu Jun Che, Zhen Liao, Tian Lan
Amylose and amylopectin, two different polymers, have the same basic structure, but differ in their length and degree of branching, which ultimately affects the physicochemical properties of these polymers[3].
The branched structure is of considerable importance as it influences the rheology and mechanical properties of the mineral binder systems.
AFM was used to extract the surface properties of the specimens.
The relationship between microstructure modified by amylopectin in glutinous rice porridge and mechanical properties of cement pasts will be the subject of further research.
Wang, et al, Effect of gamma irradiation on starch viscosity and physicochemical properties of different rice, Radiat.
The branched structure is of considerable importance as it influences the rheology and mechanical properties of the mineral binder systems.
AFM was used to extract the surface properties of the specimens.
The relationship between microstructure modified by amylopectin in glutinous rice porridge and mechanical properties of cement pasts will be the subject of further research.
Wang, et al, Effect of gamma irradiation on starch viscosity and physicochemical properties of different rice, Radiat.
Online since: September 2022
Authors: M. Rajyalakshmi, S. Naga Kumar, P. Sasidhar, K.I. Vishnu Vandana
Arola and Ramulu [5] studied the impact of material properties on a superficial level honesty and surface that outcomes from grating waterjet (AWJ) machining of distributes.
Sekulic and Mandic [15] conducted experimental study to identify the affect of machining factors on surface integrity.
Manoj, et al., [20]studied the affect of machining factors in machining of Inconel 718 using AWJM.
The most important aspect affecting surface polish is the abrasive grain size.
This may be used to machine any delicate material without affecting the quality or qualities of the surface.
Sekulic and Mandic [15] conducted experimental study to identify the affect of machining factors on surface integrity.
Manoj, et al., [20]studied the affect of machining factors in machining of Inconel 718 using AWJM.
The most important aspect affecting surface polish is the abrasive grain size.
This may be used to machine any delicate material without affecting the quality or qualities of the surface.
Online since: May 2014
Authors: Hiroyuki Y. Yasuda, Kentaro Soma, Yoshiaki Odawara
Note that the Schmid factors for () [111] and (010) [001] slip systems are 0.5 at A and B orientations, respectively.
Yasuda, Mechanical properties and hardening mechanism of Fe-Al-Ni single crystals containing NiAl precipitates, Acta Mater. 61 (2013) 1716-1725
Pineau, Room temperature tensile properties of Fe-19wt.
Sauthoff, The strengthening effect of (Ni,Fe)Al precipitates on the mechanical properties at high temperatures of ferritic Fe-Al-Ni-Cr alloys, Intermetallics 13 (2005) 1263-1268
Miracle, The physical and mechanical properties of NiAl, Acta Metall.
Yasuda, Mechanical properties and hardening mechanism of Fe-Al-Ni single crystals containing NiAl precipitates, Acta Mater. 61 (2013) 1716-1725
Pineau, Room temperature tensile properties of Fe-19wt.
Sauthoff, The strengthening effect of (Ni,Fe)Al precipitates on the mechanical properties at high temperatures of ferritic Fe-Al-Ni-Cr alloys, Intermetallics 13 (2005) 1263-1268
Miracle, The physical and mechanical properties of NiAl, Acta Metall.
Online since: June 2012
Authors: Ming Chang Shih, Jen Sheng Shie
However, the performance of this type of bearing is greatly affected by the groove shape during the design process and the type of restrictor.
Consider a steady, we assume that the fluid properties are isotropic, isothermal, isoviscous, and laminar flow.
Hence, we defined three levels variation for the factors , , , and , respectively, listed in the Table 2.
The proposed fitness function can be defined as (5) where , , , and are weighting factors, , .
Table 2 Factors and Levels Levels Factors (mm) 1 4 7 0.2 0.02 2 6 8.5 0.4 0.04 3 8 10 0.6 0.06 Table 3 The Parameters Searching Range Parameters Range Unit 3 ~ 9 7 ~ 10 0.1 ~ 0.7 0.01 ~ 0.07 HTGA/Gray Approach.
Consider a steady, we assume that the fluid properties are isotropic, isothermal, isoviscous, and laminar flow.
Hence, we defined three levels variation for the factors , , , and , respectively, listed in the Table 2.
The proposed fitness function can be defined as (5) where , , , and are weighting factors, , .
Table 2 Factors and Levels Levels Factors (mm) 1 4 7 0.2 0.02 2 6 8.5 0.4 0.04 3 8 10 0.6 0.06 Table 3 The Parameters Searching Range Parameters Range Unit 3 ~ 9 7 ~ 10 0.1 ~ 0.7 0.01 ~ 0.07 HTGA/Gray Approach.
Online since: September 2016
Authors: Christina Radlbeck, Mathias Rengstl, Senta Pessel, Martin Mensinger
The mean stress effect was also taken into account in design by introducing a bonus factor [3]
Because of the welding also the reduction factors ro und ru for the strength values in the heat affected zone are presented.
In DIN EN 1999-1-1 material properties for age hardened as well as non age hardened aluminum alloys are listed.
The ratio f0.2 / f0.1 characterizes the solidification of aluminium alloys and depends on the mechanical and thermal manufacturing condition of the structural element.
Stress concentration factor - butt weld [13] h≤1,5 mm+0,1 b, max. 6 mm Figure 3.
Because of the welding also the reduction factors ro und ru for the strength values in the heat affected zone are presented.
In DIN EN 1999-1-1 material properties for age hardened as well as non age hardened aluminum alloys are listed.
The ratio f0.2 / f0.1 characterizes the solidification of aluminium alloys and depends on the mechanical and thermal manufacturing condition of the structural element.
Stress concentration factor - butt weld [13] h≤1,5 mm+0,1 b, max. 6 mm Figure 3.
Online since: August 2020
Authors: Radek Štefan, Jaroslav Procházka, Martin Benýšek
In most cases, the fire model parameters (fire load, fire compartment geometry, material properties of enclosure surfaces, ventilation condi tions, etc.) are assumed to be deterministic, i.e. constant, without any variability.
For the thermal absorptivity of the total enclosure, we consider high quality of modern building materials with small deviations in the thermal properties.
Mechanical Analysis For the mechanical analysis of the slab panel, an iterative procedure based on the momentcurvature approach was used.
Hence, for the subsequent thermal and mechanical analysis of the slab panel, only the fire curves obtained using the Latin Hypercubes method were utilized.
It was shown that the variability of the fire model parameters strongly affects the predicted fire resistance of the analysed slab panel.
For the thermal absorptivity of the total enclosure, we consider high quality of modern building materials with small deviations in the thermal properties.
Mechanical Analysis For the mechanical analysis of the slab panel, an iterative procedure based on the momentcurvature approach was used.
Hence, for the subsequent thermal and mechanical analysis of the slab panel, only the fire curves obtained using the Latin Hypercubes method were utilized.
It was shown that the variability of the fire model parameters strongly affects the predicted fire resistance of the analysed slab panel.
Online since: March 2015
Authors: Xin Yu Wu, Xiao Shan Lu, Jian Yong Zuo
The study indicates that the size of the magnetic axis is the main factor affecting the attraction, but the shape parameters of the brake are the key affecting the magnetic field distribution.
The model includes the permanent magnets of brake and its coupled railway steel rail, and the brake device ignores non-critical parts (such as bolts) that do not affect the computational result[5].
The simulation has the following assumptions: (1) Influence of change of parameters on mechanical property is ignored; (2) All the simulation results are within acceptable scope.
During the process of braking, the partition board of certain width may effectively reduce leakage flux and thus increase permanent-magnetic attraction; however, when the width is relatively large, the volume of magnetic conducting material is affected and reduced, thus affecting conducting of magnetic force.
Proper wear may affect air gap distribution between the slipper and the steel rail, but has little influence on the permanent-magnetic attraction.
The model includes the permanent magnets of brake and its coupled railway steel rail, and the brake device ignores non-critical parts (such as bolts) that do not affect the computational result[5].
The simulation has the following assumptions: (1) Influence of change of parameters on mechanical property is ignored; (2) All the simulation results are within acceptable scope.
During the process of braking, the partition board of certain width may effectively reduce leakage flux and thus increase permanent-magnetic attraction; however, when the width is relatively large, the volume of magnetic conducting material is affected and reduced, thus affecting conducting of magnetic force.
Proper wear may affect air gap distribution between the slipper and the steel rail, but has little influence on the permanent-magnetic attraction.
Online since: January 2016
Authors: Sergio Lorenzi, Stefano Garlati, Patricia Kara, Luigi Coppola
Acrylates, moreover, can be tailored to attain suitable rheological and mechanical behavior of concrete by modifying the PEO chain.
Materials and methods Concretes with w/c equal to 0.53, consistency class F5 (flow table higher than 580 mm - EN 12350-5) and with a cement factor of 325 kg/m3 were manufactured.
The rheological and mechanical behavior of concrete mixtures was studied at a room temperature of 20°C and at the temperature of 30°C in order to simulate hot climate condition for concrete placing.
Table 1 Physical and chemical compositions of Portland limestone cements Cement L.o.i. 500 °C SiO2 Al2O3 Fe2O3 TiO2 CaO MgO SO3 Na2O K2O Cl CE II / B - LL 32.5 R 0.96 16.59 3.89 1.73 0.12 60.01 2.42 2.67 0.13 0.62 0.02 CE II / A - LL 42.5 R 0.99 19.96 4.21 2.06 0.20 61.61 2.73 2.85 0.12 0.80 0.04 Table 2 Properties of NSF, PCE and blended superplasticizers Properties NSF PCE PNH1 PNH2 Molecular weight (MW) [g/mol] 14000 25000 3000 2000 PDI (MW/Mn) 10 2.3 1.2 1.2 Side chain length [g/mol] 1000 1000 150-1000 Monomer type Ester of acrylic or methacrylic acid Polyamine Polyamine Ionic groups/non-ionic side chains 3.6 3 3 Table 3 Blended superplasticizers Base PNH1 10% 30% 50% 70% 90% NSF 10PNH1/NSF 30PNH1/NSF 50PNH1/NSF PCE 50PNH1/PCE 70PNH1/PCE 90PNH1/PCE Base PNH2 PCE 50PNH2/PCE 70PNH2/PCE 90PNH2/PCE Experimental results and discussion Superplasticizer dosage and air entrapped.
Blended PCE/PNH superplasticizer performances, on the other hand, seem to be more affected by the cement type/class.
Materials and methods Concretes with w/c equal to 0.53, consistency class F5 (flow table higher than 580 mm - EN 12350-5) and with a cement factor of 325 kg/m3 were manufactured.
The rheological and mechanical behavior of concrete mixtures was studied at a room temperature of 20°C and at the temperature of 30°C in order to simulate hot climate condition for concrete placing.
Table 1 Physical and chemical compositions of Portland limestone cements Cement L.o.i. 500 °C SiO2 Al2O3 Fe2O3 TiO2 CaO MgO SO3 Na2O K2O Cl CE II / B - LL 32.5 R 0.96 16.59 3.89 1.73 0.12 60.01 2.42 2.67 0.13 0.62 0.02 CE II / A - LL 42.5 R 0.99 19.96 4.21 2.06 0.20 61.61 2.73 2.85 0.12 0.80 0.04 Table 2 Properties of NSF, PCE and blended superplasticizers Properties NSF PCE PNH1 PNH2 Molecular weight (MW) [g/mol] 14000 25000 3000 2000 PDI (MW/Mn) 10 2.3 1.2 1.2 Side chain length [g/mol] 1000 1000 150-1000 Monomer type Ester of acrylic or methacrylic acid Polyamine Polyamine Ionic groups/non-ionic side chains 3.6 3 3 Table 3 Blended superplasticizers Base PNH1 10% 30% 50% 70% 90% NSF 10PNH1/NSF 30PNH1/NSF 50PNH1/NSF PCE 50PNH1/PCE 70PNH1/PCE 90PNH1/PCE Base PNH2 PCE 50PNH2/PCE 70PNH2/PCE 90PNH2/PCE Experimental results and discussion Superplasticizer dosage and air entrapped.
Blended PCE/PNH superplasticizer performances, on the other hand, seem to be more affected by the cement type/class.
Online since: September 2013
Authors: Arne Kromm, Zuheir Barsoum, Majid Farajian
A variety of post weld mechanical and thermal treatments have been developed during the last decades.
It becomes clear that compressive residual stresses are located predominantly in the transition to the heat affected zone.
The beneficial changes of the surface condition regarding residual stress and hardness contribute to an improved fatigue property which could be calculated quantitatively: Figure 6.
This process is generally used to improve the mechanical properties of axisymetrical components such as shafts in the industry.
Another important factor is the stability of the induced compressive residual stresses which should be studied further.
It becomes clear that compressive residual stresses are located predominantly in the transition to the heat affected zone.
The beneficial changes of the surface condition regarding residual stress and hardness contribute to an improved fatigue property which could be calculated quantitatively: Figure 6.
This process is generally used to improve the mechanical properties of axisymetrical components such as shafts in the industry.
Another important factor is the stability of the induced compressive residual stresses which should be studied further.