Search Options

Sort by:

Publication Type:

Open access:

Publication Date:

Periodicals:

Search results

Online since: August 2009
Authors: Ayman S. Mosallam
The effect of temperature causes a progressive reduction in both the stiffness and the strength of material.
Because of reduction of both the strength and the stiffness of the matrix, polymer composites exhibit more deflection and premature failure is unavoidable.
Both temperature and humidity were monitored and measured using calibrated Digital Hygro-Thermometer which was connected directly to the data acquisition system.
Strain Diagram for (a) Room-Temperature Creep (b) high-Temperature Creep Creep response data was measured using isothermal tests at constant stress levels.
The resulting data is reported as strain versus time curves.
Online since: July 2016
Authors: Jirasak Tharajak, Duongruitai Nicomrat, Paisan Kanthang
The results showed that productivity of cultured microorganisms in the paddy applied with pesticides has dropped only slightly (approximately 9% reduction), however, more spore-forming Gram positive bacteria were detected.
There was significant reduction in CFU of bacteria after 4 months of rice planting period in the pesticide treated soil at the depth after 10-20 cm, while the upper layer and top soil had no significant reduction of the bacterial numbers.
More gram positive bacteria were detected than gram negative bacteria as shown in Table 1, their numbers were enumerated to be 92 + 1.9% and the numbers of these bacteria were more than those of fungi approximately 53 + 3.2 % (data not shown).
These tolerant species of Gram positive anaerobic bacteria were cultivable (data not shown).
Their diversities were lower both species and numbers compared to those of the negative control without pesticide (data not shown).
Online since: September 2011
Authors: Samraj Ravi, Murugasan Pradeep Kumar
The cutting force was measured using a piezoelectric type dynamometer (Kistler type 9257B), a multichannel charge amplifier (Kistler-type 5070A12100) and a PC based data acquisition system (Dynoware) for each machining conditions.
In general, the reduction of cutting temperature depends on the heat convection of the cutting fluid.
The high lubricating and cooling effect is obtained by high pressure nozzle delivered LN2 in the atomized state, which results in reduction of friction and facilitates chip formation and removes heat more intensively due to higher velocity which results in increase in its surface-to-volume ratio by reduction of the size of the droplets and the reduction in temperature as it leaves the nozzle.
The percentage reduction in cutting temperature was observed to be 41% and 34%.
Therefore, the reduction in the cutting force under LN2 machining results from the decrease in the cutting temperature, retention of hardness and strength of the tool material, reduction in tool wear and the favorable change in chip-tool and work-tool interactions.
Online since: January 2012
Authors: Michael Markushev, Oleg Sitdikov, Elena Avtokratova, Oksana Mukhametdinova
Cold rolling with reduction of 80%, in contrast, provided a heavily deformed structure with high dislocation density.
Nowadays, the data on such processing of UFG sheets with enhanced SP properties from Al-Mg-Sc(-Zr) alloys are, however, quite poor.
The warm rolling was carried out under isothermal conditions (at constant temperature of a sample and rolls) at 325oC with total reduction of 86%, and the cold rolling was performed at ambient temperature with total reduction of 80%.
Note that such data are superior to the respective values, which have ever been reported for both Al-Mg-Sc(-Zr) alloys and other Al-based matrix alloys exhibited structural superplasticity.
Such data are superior to the respective values, which have ever been reported for both Al-Mg-Sc(-Zr) alloys and other Al-based matrix alloys exhibited structural superplasticity.
Online since: September 2017
Authors: M.O. Korovkin, D.M. Grintsov
However, there are data that show that joint grinding of superplasticizers and cement is not effective in mixtures with low water-cement ratio at cement grinding to a specific surface area of 450 m2/ kg [19].
Cement 3 65.4±4.7 13.8±4.1 9.5±1.7 11.3±2.5 0.53 ± 0.15 0.29 ±0.2 0.6 ±0.08 * According to the manufacturer data Results and Discussion The dependence of water-reducing effect of the SP on the time of determining the consistency of hard and poor plastic mixtures (mixture flow on a jolting table 110 and 190 mm, respectively) at different methods of additives introducing is shown in Table 2.
Cement 3 350 hard at grinding 18.5 18.6 17.1 15.7 13.9 17.7 16.3 powder 24.0 20.9 19.6 16.8 14.7 14.7 9.4 plastic at grinding 16.3 12.6 12.3 12.8 16.7 14.4 1.1 powder 18.2 13.3 9.8 10.2 11.9 6.6 0.0 450 hard at grinding 12.9 14.1 22.1 23.7 23.8 19.0 12.5 powder 26.8 18.4 18.2 20.0 22.2 22.8 21.1 plastic at grinding 18.2 11.3 6.8 1.5 -4.1 -7.3 -4.5 powder 17.3 16.6 14.8 13.0 11.4 4.9 4.0 As we can see from the data shown in Table 2, almost for all compositions the efficiency of two methods of SP S-3 introduction is approximately at the same level.
These data are consistent with the results of research obtained in [19].
Influence of a Superplasticizer on Cement Grinding and Its Activity Reduction During Storage, Procedia Engineering, 150 (2016) 1600-1604.
Online since: April 2014
Authors: Zhe Liu, Wei Hua Zeng
However, their true ability of contribution to greenhouse gas (GHG) emissions reductions is invisible.
There is, therefore, a demand to develop alternatives motivated by the reduction of the dependency on fossil fuel due to the limited resources.
It can also fully support data collection and record the original parameters and the data collecting process.
The data we use is coming from CLCD and all of them are background data.
In this study, we choose global warming potential and acidification as the characterization factors, the normalization reference of China in 2010 as the normalization, the ECER-125 (twelfth five year energy conservation and emission reduction overall indicator) as the weighted comprehension targets.
Online since: January 2012
Authors: Mauro Martin, Werner Theisen, Sebastian Weber
Molar volume data was also taken from Calphad data while a constant lattice parameter of 0.3589 nm was assumed for all alloys.
The major uncertainty of the calculation arises from the accuracy of thermodynamic data at room temperature and the unknown contribution of interfacial energy s.
Thus, to calibrate the method, literature data of SFE of AISI 304 was used to re-calculate the contribution of s.
For metastable austenitic stainless steels the SFE values are comparatively high, though, two aspects have to be considered: First, the accuracy of thermodynamic data at room temperature is low.
On the basis of the screening results and literature data, a concept for a lean alloyed – with respect to alloy surcharge – austenitic stainless steel was developed [16].
Online since: October 2011
Authors: Ying Li Shao
The traditional exhaust silencers, which are normally constructed by combination of expansion chamber, and perforated pipe or perforated board, are with high exhaust resistance, but poor noise reduction especially for the low-frequency band noise.
But most of the traditional exhaust mufflers are composed of expansion chamber, and perforated pipe or perforated board [2], whose exhaust resistance is rather great and whose function of noise reduction is very poor, especially for the low frequency, which is the major part of exhaust noise [3].
In accordance with the theory of sound radiation, the author can regard the two opposite holes as the two plunger sound source, and due to the reverse oscillation, the radiation capability of the combined sound resource is reduced, so the author can reach the aim of noise reduction.
Fig. 1 Principle of the muffler using reversed-phase cancelling Analysis to the experimental results The theoretical formula for transmission loss of the new type muffler TL= The author designs 3 series of data and name them as Muffler TypeΙ, Muffler TypeⅡ and Muffler TypeⅢ, and their sizes are as the following: Muffler TypeΙ: r=165mm, l=80mm; Muffler TypeⅡ: r=165mm, l=60mm; Muffler TypeⅢ: r=56mm, l=80mm -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.2 The contrast curve of the insertion loss (1400r/min) -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.3 The contrast curve of the insertion loss (1600r/min) -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.4 The contrast curve of the
Online since: December 2013
Authors: Yan Xu, Jia Hai Yuan
Data of GDP, primary energy consumption, CO2 emissions and primary energy structure can be used to calculate CO2 intensity and emission factor of primary energy.
In our study, we use the official data of fossil fuel from the NSBC and fuel CO2 emissions data from the IEA for China during 2005-2010 [8-9].
Table 2 Estimation of 2015 and 2020 CO2 emission factor for primary energy supply Year Share over primary energy (%) CO2 emission factor of primary energy supply (tonnes/tce) CO2 emissions (Mt) GDP CO2 intensity (tonnes/10000Yuan) coal oil gas Non-fossil 2005 70.8 19.8 2.6 6.8 2.10 5103.0 2.76 2010 68.0 19.0 4.4 8.6 2.23 7258.5 2.31 2015 65.1 18.0 5.5 11.4 2.15 - 1.91(-17%) 2020 60.5 17.5 7.0 15 2.04 - 1.65(-40%) 1.51(-45%) Note: The italic data are official planning while the underlined data are estimated based on the planning and other assumptions.
For 2020, the energy demand at 40% or 45% reduction of GDP CO2 intensity is substantially larger than the value of the feasible range.
The 15% clean energy target and 45% CO2 intensity reduction under Baseline and High scenarios could not meet the international expectation.
Online since: December 2011
Authors: Feng Xia Gu, Wen Bao Liu
Data sources and processing The primary datasets used in this study was three landuse maps of 1981, 1990, and 2000 of the study area.
These data were digitized from paper topography maps with a scale of 1:5000.
The major data processing steps included: (1) creating TIF raster data files by scanning the topographic maps in MapGIS, (2) geometrically correcting the scanned data and registering them for on-screen digitizing to generate the vector data files, (3) using the codes of parcels to link the spatial data with their attributes, (4) transforming MapGIS vector data into ArcGIS vector data formats, and (5) converting vector data into raster data and aggregating original landuse types into five classes: agricultural land, urban land, forest meadow, wetland and water bodies.
As a result, the area of agricultural land decreased with a net reduction of 122.76 km2 during the decade.
The net reduction of water bodies was 17.17 km2.
Showing 4331 to 4340 of 40300 items