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Online since: June 2006
Authors: Gintas Viselga
The gantry module is positioned by a
special positioning trundle and is run by a 12 V electric motor through a worm self - braking
reduction gear.
It is run by a 12V electric motor through a worm self - braking reduction gear.
According to the experimental data of tramlines unevenness, a measuring and computer chassis simulation program was developed in the Matlab environment and we obtained positioning deviation results of PGM individual chassis run between positions' distances or the number of positions to permissible set position (Fig.2).
On the basis of the above-mentioned data we can maintain that positioning speed is a decisive factor for positioning precision.
Accuracy of positioning increases with the reduction of speed of movement chassis and with that of the connected forces of inertia of the gantry unit. 3.
It is run by a 12V electric motor through a worm self - braking reduction gear.
According to the experimental data of tramlines unevenness, a measuring and computer chassis simulation program was developed in the Matlab environment and we obtained positioning deviation results of PGM individual chassis run between positions' distances or the number of positions to permissible set position (Fig.2).
On the basis of the above-mentioned data we can maintain that positioning speed is a decisive factor for positioning precision.
Accuracy of positioning increases with the reduction of speed of movement chassis and with that of the connected forces of inertia of the gantry unit. 3.
Online since: July 2011
Authors: Bai Lian Lai
Technical Proposal
2.1 The Choices for Remote Sensing Data
The remote sensing data are the basis of remote sensing investigation for land utilization.
In consideration of the economic and technical factors, data source space resolution and the stability of the data, the present research chooses the intermediate space resolution of Landsat-7 TM/ETM(ASTER)in the years of 1999 and 2002 and ARSTER in the year of 2004 for the analysis and remote sensing monitoring of land utilization in the scale of 1:100000 Asku river reaches.
Accordingly, the remote sensing data can only be obtained from July to September in their growing period so as to meet the unified needs and dynamic analysis for the large-area investigation results. 2.2 The Collection of Land Utilization Data The data are collected in grades and classifications.
In the analysis, the geometric stretching is adopted for the data to make it comparable.
The general profile of them can be described as “two extensions and one reduction”.
In consideration of the economic and technical factors, data source space resolution and the stability of the data, the present research chooses the intermediate space resolution of Landsat-7 TM/ETM(ASTER)in the years of 1999 and 2002 and ARSTER in the year of 2004 for the analysis and remote sensing monitoring of land utilization in the scale of 1:100000 Asku river reaches.
Accordingly, the remote sensing data can only be obtained from July to September in their growing period so as to meet the unified needs and dynamic analysis for the large-area investigation results. 2.2 The Collection of Land Utilization Data The data are collected in grades and classifications.
In the analysis, the geometric stretching is adopted for the data to make it comparable.
The general profile of them can be described as “two extensions and one reduction”.
Online since: September 2014
Authors: Bin Ouyang, Zhen Hua Feng, Xue Ying Yang, Yang Liu, Yi Zhang
Currently, domestic and foreign scholars have done a lot of researches on green and low-carbon evaluation system, and evaluation methods mainly include input-output, analytic hierarchy process (AHP), fuzzy comprehensive evaluation, data envelopment analysis(DEA), and principal component analysis (PCA) etc.[5, 6].
(2) Evaluation basis and standards: primary data of evaluation indicators mainly comes from China Transport Statistical Yearbook and Collection of Provincial Transport Statistical Data; statistical data of transportation and highway of provinces or cities; major enterprise monitoring and typical survey data etc.
Empirical analysis of green and low-carbon development level of Hunan Linxiang-Yueyang Expressway 3.1 Data With a total length of 72.04km, Hunan Linxiang-Yueyang Expressway (short for Da-Yue Expressway) was fully commenced in 2013, and it was planned that this expressway would be completed and opened in 2016.
The data mainly comes from statistical data of Hunan Transportation from Hunan Provincial Department of Transportation and Hunan Expressway Administration Bureau in the past years, as well as statistical monitoring of energy consumption and typical survey data, etc. 3.2 Evaluation results According to overall requirements of green low-carbon highway evaluation index system, under the condition of combining development feature and actual situation of Hunan Da-Yue Expressway, this paper proposes that the overall objective of green low-carbon development of Hunan Da-Yue Expressway is: by 2017, the first green and low-carbon highway in Hunan will be basically completed, the total energy conservation will be up to 41,900 tons of standard coal equivalent, 29,800 tons of standard oil equvilent (toe) will be replaced, and CO2 emission will be reduced by 119,900 t; the total energy consumption in construction period will decrease by 73.4%, and the total amount of carbon emission will decrease
Acknowledgements The authors gratefully acknowledge the financial support from NDRC China Low Carbon Development Strategic Research Project Grant No.201215, Ministry of Transport Energy-saving and Emission-reduction Project Grant No. 2013-JNJP-011-020.
(2) Evaluation basis and standards: primary data of evaluation indicators mainly comes from China Transport Statistical Yearbook and Collection of Provincial Transport Statistical Data; statistical data of transportation and highway of provinces or cities; major enterprise monitoring and typical survey data etc.
Empirical analysis of green and low-carbon development level of Hunan Linxiang-Yueyang Expressway 3.1 Data With a total length of 72.04km, Hunan Linxiang-Yueyang Expressway (short for Da-Yue Expressway) was fully commenced in 2013, and it was planned that this expressway would be completed and opened in 2016.
The data mainly comes from statistical data of Hunan Transportation from Hunan Provincial Department of Transportation and Hunan Expressway Administration Bureau in the past years, as well as statistical monitoring of energy consumption and typical survey data, etc. 3.2 Evaluation results According to overall requirements of green low-carbon highway evaluation index system, under the condition of combining development feature and actual situation of Hunan Da-Yue Expressway, this paper proposes that the overall objective of green low-carbon development of Hunan Da-Yue Expressway is: by 2017, the first green and low-carbon highway in Hunan will be basically completed, the total energy conservation will be up to 41,900 tons of standard coal equivalent, 29,800 tons of standard oil equvilent (toe) will be replaced, and CO2 emission will be reduced by 119,900 t; the total energy consumption in construction period will decrease by 73.4%, and the total amount of carbon emission will decrease
Acknowledgements The authors gratefully acknowledge the financial support from NDRC China Low Carbon Development Strategic Research Project Grant No.201215, Ministry of Transport Energy-saving and Emission-reduction Project Grant No. 2013-JNJP-011-020.
Online since: February 2019
Authors: S. Chupin, Victor I. Bolobov
It has been found out that HTMT leads to increase of steel hardness and reduction of wear rate compared to heat treatment applied at manufacture of cutters.
The maximal increase of hardness (by 23%) and reduction of wear rate (by 38%) corresponds to the mode of distortion accumulation of ~1,5 at 900 °С at water quenching and tempering at 230 °C.
Reduction of these resources has been a very urgent issue in the industry and its topicality remains in mining mechanical engineering today.
Influence of thermomechanical treatment on wear resistance of materials is studied insufficiently [13-18] and there is almost no data about its effects on abrasion wear resistance.
Obtained positive effect can be explained by austenite grain refinement and corresponding reduction of martensite crystal sizes (from 20 to 4 micron) which occur during HTMT.
The maximal increase of hardness (by 23%) and reduction of wear rate (by 38%) corresponds to the mode of distortion accumulation of ~1,5 at 900 °С at water quenching and tempering at 230 °C.
Reduction of these resources has been a very urgent issue in the industry and its topicality remains in mining mechanical engineering today.
Influence of thermomechanical treatment on wear resistance of materials is studied insufficiently [13-18] and there is almost no data about its effects on abrasion wear resistance.
Obtained positive effect can be explained by austenite grain refinement and corresponding reduction of martensite crystal sizes (from 20 to 4 micron) which occur during HTMT.
Online since: July 2013
Authors: Hong Yu, Jie Qiong Zeng
We find that a significant reduction of energy gap is caused by the presence of double-bonded oxygen, whereas for other three oxygen configurations there is just a slight reduction on energy gap.
However, silicon is the desired material for optoelectronics devices, because silicon optoelectronics is expected to promote the full integration of photon which could open the door to faster data transfer and higher integration densities in the silicon microelectronics industry.
For double-bonded case, there is a strong reduction (red shift) of the Eg with respect to the full hydrogen-passivated case (as shown in Fig. 2).
A significant reduction of energy gap is caused by the presence of double-bonded oxygen, whereas for other three oxygen configurations (backbonded, bridge-bonded and inserted) there is just a slight reduction on energy gap.
However, silicon is the desired material for optoelectronics devices, because silicon optoelectronics is expected to promote the full integration of photon which could open the door to faster data transfer and higher integration densities in the silicon microelectronics industry.
For double-bonded case, there is a strong reduction (red shift) of the Eg with respect to the full hydrogen-passivated case (as shown in Fig. 2).
A significant reduction of energy gap is caused by the presence of double-bonded oxygen, whereas for other three oxygen configurations (backbonded, bridge-bonded and inserted) there is just a slight reduction on energy gap.
Online since: February 2023
Authors: Farah Hanim Ab Hamid, Ikhmal Zariq Al Imran Jamal Ikhsan, Muhamad Noor Faqeh Bakar, Hariz Asyraf Hamizlan, Anwar Addini Mazzam
The volumetric flask was topped up with distilled water up to the datum line.
TCP Reduction (TR).
ANOVA is another step in RSM to test the fitness of the second-order polynomial models to the experimental data.
Furthermore, the value of R2 of the model obtained for K and TR were 0.95668 and 0.9270 respectively, indicating that the model fit the data well [27].
Thus, these values indicate the fitness of the mathematical model to the experimental data [31].
TCP Reduction (TR).
ANOVA is another step in RSM to test the fitness of the second-order polynomial models to the experimental data.
Furthermore, the value of R2 of the model obtained for K and TR were 0.95668 and 0.9270 respectively, indicating that the model fit the data well [27].
Thus, these values indicate the fitness of the mathematical model to the experimental data [31].
Online since: April 2005
Authors: M. Rekas, M. Radecka
The aim of this work is, basing on defect model, comparison of chemical diffusion coefficient
with atomic diffusion data in titanium dioxide.
As can be seen, good agreement between experimental and theoretical data is observed.
The statistical analysis showed that there are no differences between both sets of these data.
As can be seen the best agreement was achieved for A = 0.1 at.% and literature data of DO and DTi [11,12], respectively.
Conclusions Chemical diffusion coefficient in TiO2 single crystal within n-p transition range was determined from electrical conductivity transient data.
As can be seen, good agreement between experimental and theoretical data is observed.
The statistical analysis showed that there are no differences between both sets of these data.
As can be seen the best agreement was achieved for A = 0.1 at.% and literature data of DO and DTi [11,12], respectively.
Conclusions Chemical diffusion coefficient in TiO2 single crystal within n-p transition range was determined from electrical conductivity transient data.
Online since: December 2012
Authors: Konrad Staudt, Wolfgang Böhme, Werner Baumgartner
Carbohydrates attached to β-keratins seem to be unusual, and the investigation of their function for friction and abrasion reduction in the sandfish is interesting and may lead to biomimetic innovations.
After treatment with harsher conditions (1 hour sandblasting from a height of 30 cm) all samples were completely dull and scratched and no difference in roughness could be measured (data not shown).
Eumeces schneideri and Scincus scincus show similar carbohydrates, however a higher relative quantity was found in S. scincus (data not shown).
The results presented clearly show that friction is reduced through glycans attached to proteins of S. scinus scales mainly by reduction of adhesive forces.
This may be caused by reduction of adhesive wear (less abrasion through less material interaction, respectively friction).
After treatment with harsher conditions (1 hour sandblasting from a height of 30 cm) all samples were completely dull and scratched and no difference in roughness could be measured (data not shown).
Eumeces schneideri and Scincus scincus show similar carbohydrates, however a higher relative quantity was found in S. scincus (data not shown).
The results presented clearly show that friction is reduced through glycans attached to proteins of S. scinus scales mainly by reduction of adhesive forces.
This may be caused by reduction of adhesive wear (less abrasion through less material interaction, respectively friction).
Online since: January 2016
Authors: Tomáš Panáček, Milan Klapka
Reduction of pneumatic tyred roller fuel consumption
Tomáš Panáček1, a *, Milan Klapka2, b
1Inst. of Machine and Industrial Design, BUT, Technická 2896/2, 616 69, Brno, Czech Republic
2Inst. of Automation and Computer Science, BUT, Technická 2896/2, 616 69, Brno, Czech Republic
apanacek@fme.vutbr.cz, bklapka.m@fme.vutbr.czk
Keywords: Kinetic energy regeneration, numerical simulation, optimization, evolutionary algorithms.
Introduction Reduction of vehicle fuel consumption is nowadays a significant technical problem in many heavy vehicle categories, e.g. construction vehicles [1].
The model vas verified against data acquired during several road tests of the actual vehicle.
The parameters to be optimized were as follows: level of nitrogen pressure in a high-pressure accumulator, level of the minimum pressure in the high-pressure accumulator, the moment of reduction of the variable displacement of the hydraulic motor and the time period of the signal controlling the hydraulic motor (acceleration or deceleration ramp).
Adjusted operational parameters operational parameter description unit initial value pacH0 nitrogen pressure in a high-pressure accumulator MPa 10,00 pacHAccelStop level of the minimum pressure in the high-pressure accumulator, end of acceleration (Accel) MPa 11,00 THM moment of reduction of the variable displacement of the hydraulic motor (gear change to 2nd) s 11,75 RHM time period of the signal controlling the hydraulic motor (ramp) s 6,00 It is also possible to optimize various driving modes of the vehicle in order to achieve optimal efficiency of the kinetic energy accumulation and expenditure at low operational speed of the experimental vehicle.
Introduction Reduction of vehicle fuel consumption is nowadays a significant technical problem in many heavy vehicle categories, e.g. construction vehicles [1].
The model vas verified against data acquired during several road tests of the actual vehicle.
The parameters to be optimized were as follows: level of nitrogen pressure in a high-pressure accumulator, level of the minimum pressure in the high-pressure accumulator, the moment of reduction of the variable displacement of the hydraulic motor and the time period of the signal controlling the hydraulic motor (acceleration or deceleration ramp).
Adjusted operational parameters operational parameter description unit initial value pacH0 nitrogen pressure in a high-pressure accumulator MPa 10,00 pacHAccelStop level of the minimum pressure in the high-pressure accumulator, end of acceleration (Accel) MPa 11,00 THM moment of reduction of the variable displacement of the hydraulic motor (gear change to 2nd) s 11,75 RHM time period of the signal controlling the hydraulic motor (ramp) s 6,00 It is also possible to optimize various driving modes of the vehicle in order to achieve optimal efficiency of the kinetic energy accumulation and expenditure at low operational speed of the experimental vehicle.
Online since: May 2014
Authors: Şakir Bor, Emin Erkan Aşık, G. Ipek Nakaş, Bensu Tunca
Samples with 7 mm x 10 mm x 100 mm were cut from the plate and rolled with a 0.2 mm reduction in thickness in each pass at room temperature.
Strain of the rolled samples were given in terms of reduction in area (RA) since dimension change in transverse direction was found to be ignorable.
Fractional softening, Xh, was calculated using the following equation: Xh = Cold rolled hardness-Recry. hardnessCold rolled hardness -Fully annealed hardness (1) Calculated fractional softening data and quantitatively measured recrystallization fraction data are plotted in Fig. 4 to visualize the relation between them in order to have an indirect but approximate approach to recrystallization kinetics.
Both deformation methods was unable to create crack free samples at room temperature for more than 20% reduction in area.
SEM images of samples swaged to 20% reduction in area revealed that swaging causes a decrease in the recrystallization start temperature.
Strain of the rolled samples were given in terms of reduction in area (RA) since dimension change in transverse direction was found to be ignorable.
Fractional softening, Xh, was calculated using the following equation: Xh = Cold rolled hardness-Recry. hardnessCold rolled hardness -Fully annealed hardness (1) Calculated fractional softening data and quantitatively measured recrystallization fraction data are plotted in Fig. 4 to visualize the relation between them in order to have an indirect but approximate approach to recrystallization kinetics.
Both deformation methods was unable to create crack free samples at room temperature for more than 20% reduction in area.
SEM images of samples swaged to 20% reduction in area revealed that swaging causes a decrease in the recrystallization start temperature.