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Online since: January 2021
Authors: Wafa Bouaka, Amira Benhaddou, Sofiane Saggai, Ibtissam Belaid
The objective of this study is to verify the effects of these partial replacements on concrete properties, their cost, and the CO2 emission reduction in the atmosphere.
Economically, the reduction of 10% in cement saves 5 € per ton and environmentally, it reduces the emission of CO2 from cement industry by 0.5 to 0.7% of total anthropogenic CO2 emissions.
Prepared concrete samples Tests Applied on Concrete Samples The three tests applied to the samples of concrete are: · Ultrasonic Pulse Velocity (UPV) Ultrasonic Pulse Velocity (UPV) tests are very sensitive to homogeneity and density variations and can provide important data for decision making about the conditions of concrete structures [17].
Referring to the figures of Saggai et al. [37], the reduction of 10% in cement saves 5€ per ton.
Riemer, , Emission reduction of greenhouse gases from the cement industry.
Online since: September 2016
Authors: M. Nalla Mohamed, M. Selvaraj, D. Ananthapadmanaban
The numerical models were validated with experimental data obtained from the scientific literature.
On the contrary, the damage is more extensive in the back face sheet of the sandwich structure as a result of the reduction in the velocity produced by the presence of the foam core.
Thus the inclusion of the core in the sandwich plate cannot be considered effective in terms of increment of the ballistic limit, but a significant contribution of the foam core to the reduction of residual velocities and damaged area.
Results show very good comparison between the numerical predictions obtained from the FE models and experimental data.
Comparison of numerically obtained residual velocity versus impact velocity with experimental data from the literature Conclusions The energy absorption of different composite sandwich plates with aluminium foam core subjected to high velocity impact was analyzed using a 3D finite element model in ABAQUS/Explicit.
Online since: October 2007
Authors: W.M. Daoush
Box 87, Helwan, Cairo, Egypt E-mail: waleeddaush@cmrdi.sci.eg Abstract Nano sized Co-20wt%Ni composite powder was synthesized by electroless chemical reduction method using metallic salt precursors and hypophosphite as a reducing agent in alkaline tartarate bath as a complexing agent.
In recent years a liquid phase electroless deposition process wherein the metal powder ( in composite or alloyed form)with a microcrystalline metallic powders with a nano-sized scale through the autocatalytic liquid phase reduction of the cations of the metals.
From the phosphorus content determinations by EDAX as shown in Fig.1b and by spectrophotometry method of the investigated powder was 12.5 wt% from the total alloy content and as illustrated in the XRD pattern in Fig.2a the prepared powder contains metal phosphides, but by heat treatment of the prepared powder at 500 oC in hydrogen atmosphere, the phosphrous content decreased into 0.1 % due to the reduction of the metal phosphides to the metallic NiCo material which was detected by the XRD pattern in the Fig.2b the disappearance of the metal phosphides peaks.
Table 1 lists the B-H hysteresis loops data of saturation induction(Bs) in emu/g and the coercive force values for the investigated powder and the related heat treated one at 500 oC in hydrogen.
Online since: May 2013
Authors: Feng Lin He, Mao Xiang Jing, Xiao Xiao Meng, Xiang Qian Shen
Porous nanocomposites of M/Ce-K-O (M=Co, Ni, Cu) were prepared by the citrate-gel thermal decomposition and selective reduction process, and the effect of transition metal nanoparticles on their microstructure, catalytic performance were studied by XRD, SEM, BET, XPS and TG analysis.
The catalysts M/Ce-K-O (M=Co, Ni, Cu) were prepared by the citrate-gel thermal decomposition and selective reduction process, which was described in detail in our previous work [7].
While, for the metallic Co and Ni, it can not be estimated from the XRD data since the characteristic diffraction peaks of Co (111) and Ni (111) are too weak to evaluate, implying the Co and Ni grain sizes should be smaller.
Conclusions (1) Porous nanocomposites of M/Ce-K-O (M=Co, Ni, Cu) have been successfully prepared by the citrate-gel thermal decomposition and selective reduction process
Online since: December 2010
Authors: Guang Xue Chen, Qi Feng Chen, Bao Lin Tang, Jing Lei Tai
First, Spherical silver nano-particles were reduced from silver nitrate solution by liquid chemical reduction method, with hydrazine hydrate as reductant and PVP as surface-protection reagent.
In this paper, nano-sliver particles were obtained by liquid chemical reduction with silver nitrate and hydrazine hydrate as reactants and PVP as dispersant.
After experiment data processing, the curve which reflects the relationship between PVP content and average particle size of silver particles was plotted and is shown in Fig.3.
In this paper, Spherical silver nanoparticles were reduced from silver nitrate by Liquid chemical reduction method, with hydrazine hydrate as reductant and PVP as surface-protection reagent.
Online since: July 2017
Authors: Alexandr Sergeevich Inozemtcev, Evgeniy Valerjevich Korolev
It was found that the reduction of the structural defects of high-strength lightweight concrete with high content of hollow microspheres is possible by the use of nanomodifier at the phase boundary.
The reduction of defects in lightweight concrete with ceramic microspheres can be achieved by modifying nanoscale additive of the surface of hollow filler [10-11].
However, the opposite dynamic is observed in the analysis of the data obtained for compositions of the nanomodified high-strength lightweight concrete.
Korolev, A method for the reduction of deformation of high-strength lightweight cement concrete // Advances in Cement Research. 28-2 (2015) 1-7. doi: 10.1680/jadcr.15.00049.
Online since: December 2004
Authors: Hui Wu, S.Y. Yu, Hong Tao Zhu, Bin Lin
This simulation, unlike other simulation techniques, can provide new data and insights on nanometric machining; which cannot be obtained readily in any other theory or experiment.
The α- to-β transformation results in a significant reduction of the atomic volume from 18.38o,A3 to 14.19o,A3 per atom or a densification reduction of about 22.8%.
Because β-silicon phase only existed under the high pressure and wasn't stable during the whole cutting process, these data couldn't explain absolutely the change of volume.
So, it needs to testify with more theory and experimental data.
Online since: July 2013
Authors: Chun Yan Hou, Kang Ping Yao, Li Geng Yu, Xue En Li
The data is sent to the MAC layer for further operations.
When transport layer receives data from the MAC layer, it does the reverse operation and gets complete data file by combine packages in order.
Nevertheless, for on-sensor feature extraction mode, the sensor node only transmit RMS, kurtosis, fault frequencies and their harmonics in addition to temperature and node voltage, so the data transmission load decrease from 4099B to 70 B, a 98.3% reduction.
(5) So the total energy used for on-sensor feature extraction mode is 27.3mJ, an 88.8% energy consumption reduction compared with raw data transmission mode.
Figure 6 (a) and (b) show the vibration signal and the envelop spectrum through the data collected by the raw data transmission mode.
Online since: December 2013
Authors: Tomáš Lack, Juraj Gerlici
An important noise reduction of fright cars can be achieved by replacing the cast iron brake shoes by composite brake shoes.
The ground of technical support of data acquisition and data processing are two stations HBM MGC Plus Fig. 8.
Rrails tread measurement with MiniProf device Data acquisition, data processing and data assessment is performed by our own development environment and all the test stand control will be guarantee by software LaGer. 7.
The complete measure chain specification, data acquisition, data assessment and loading running – breaking collection specification is the result of the same team too.
The tests control, data acquisition and data assessment.
Online since: February 2012
Authors: Miguel Ángel Sebastián, B.T. Rieger
To use the quick and easy method, it is essential that the necessary data are easily accessible.
It is a simply and easy way to describe current manufacturing data and physical material flow [5].
The AVSM requires a few additional data compared to the VSM but gives a much more detailed picture on the current situtation of an manufacturing situation.
Since up to 90% of the time and costs for industrial manufacturing process is not productive (because the customer does not pay for it [5]), it is assumed that the reduction of 40% is a achievable limit [1].
Starting from AVSM we introduce the data directly into the PCT and we can display curves of the evolution of manufacturing cost and time.
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