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Online since: November 2012
Authors: Bai Xiao Tang, Yong Wei Wang
Taking into account the apparent density and strength of wall insulation materials, requirements, test data to determine the optimal dosage of the foaming agent should be 0.4 ~ 0.6kg, to determine the content of foaming agent in the lightweight aggregate concrete of the most good range. 1 Introduction At present, the domestic some economically underdeveloped areas still use solid clay brick, solid clay brick production is not only consume large amounts of land and coal resources, and the production process to produce a large number of toxic sulfur dioxide gas, polluting the environment.
According to the selected raw materials, the design basis of lightweight aggregate concrete with ratio shown in Table 1 Table 1 The mix ratio of lightweight aggregate concrete Cement content kg/m3 The dosage Of fly ash kg/m3 Total water kg/m3 Ceramic sand content kg/m3 EPS amount of particles kg/m3 Dry apparent density kg/m3 Compressive strength of 28dMPa 331 65 187 410.4 2.43 893 4.52 Note: kg / m3--1m3concrete composition dosage ( kg ). 3 Test method and data The benchmark of lightweight aggregate concrete dry apparent density is 895kg/m3, in practical engineering applications, the dry apparent density is too large, resulting in large thermal conductivity, which is not conducive to energy-saving insulation wall materials in order to achieve more good energy requirements, mixed with the foaming agent is an effective way.
According to the experimental data in Table 2, using the original software can be drawn per cubic meter of foam agent content and its dry apparent density relationship curve, as shown in Figure 1.
Taking into account the requirements of strength, according to test data analysis, the optimal dosage to determine the foaming agent should be 0.4 ~ 0.6kg.
But mixed with a foaming agent, there should be some small holes in the hardening cement paste. the stress concentration phenomenon will be produced, which leads to the decrease of cement strength. the ultimate expression for the reduction of the compressive strength of concrete.With the increase of foaming agent, the density of concrete is also an increase, With the increase of foaming agent, the density of concrete is also an increase, its performance for the compressive strength of concrete increase, but the magnitude is very limited.
Online since: February 2012
Authors: Xiao Fei Wen, Zhen Dong Cui, Jin Shu Lu, Qiang Yuan
The torsional vibration test data of four sets of propulsion shafting of two ships were collected and analyzed.
The test steps are as following: speed sensors are respectively arranged on the flywheels of the main engines on both sides, and then get the signal access to the shafting torsional vibration measuring instrument(ANZT6), and the data of torsional vibration are recorded by the computer automatically.
The main engine on the right side is tested first, and then on the left; in the speed range of the main engine, from 500rpm to 1000rpm, interval of two measurements is about 15rpm, the test data are recorded by computer.
(a) 1R (a) 2L (a) 2R (d) 2L Test data analysis.
According to the rules of CCS, when the relative error between shafting calculation frequency and the actual frequency is less than 5%, the torsional vibration data got from measured point can be used to calculate the torsional stress or torsional moment of the shaft section and device of the whole shafting based on shafting torsional vibration calculations, as shown in table 1.
Online since: October 2011
Authors: Ji Zhang, Ling Yi Zhang, Yu Wang, Hong Fu Xie
The distributed power generation is an energy development way which can most manifest the multiple advantages such as the energy saving, emission reduction, safety and flexible trait.
It mainly introduces Zhuishan substation’s overall structure, key technology and using effect, From the angle of energy saving and emission reduction’s benefits to expound that this photovoltaic grid-connected power generation system not only solves self -using electricity problem of 110kV substation and reduces the energy consumption and pollution meanwhile.
Monitoring device provides the working state of the system, operational data and environmental parameters to professional technology personnel for real-time monitoring.
Online since: December 2010
Authors: Reinhard Pippan, Andrea Bachmaier
The reduction of the grain size is also reflected in an enhancement of the hardness.
In literature, numerous data is reported about the microstructure and mechanical properties of pure metals and alloys processed by severe plastic deformation.
The enhancement of the hardness after the additional 50 rotations is primarily attributed to the reduction in grain size: in the final state, a nanocrystalline microstructure is reached.
Online since: June 2010
Authors: Pai Shan Pa
By establishing a recycling process for the ultra-precise removal of the thin-film nanostructure, the optoelectronic semiconductor industry can effectively recycle defective products with a reduction of both production costs and pollution.
Data showed that the gap width between the electrode and workpiece directly influences the current conditions and the discharge of dregs in the electrolyte [5].
This ultra-precise removal of thin film microstructure enables effective recycling of defective products and the resulting reduction of production costs is of great benefit to the semiconductor optoelectronic industry.
Online since: January 2012
Authors: Chun Mu Chen, Guan Wang, Yong Jun Tang
By processing cellulosic biomass into pellets, density and handling efficiencies of cellulosic feedstock can be improved, resulting in reduction of transportation and handling costs.
The measured data were recorded and displaced on a computer.
The reduction and control technology of tar during biomass gasification/pyrolysis: an Overview.
Online since: September 2013
Authors: Wei Qi, Yue Feng Guo, Fu Cang Qin, Yun Feng Yao
The result shows that in different vegetation patterns, the secondary forest of natural bush have an obvious effect on the nutrient and concentration of organic; in the artificial forest, mingled forest has a better improving effect on soil than the pure forest and natural grassland has the smallest effect; in the same vegetation patterns, organic, total nitrogen present an overall reduction trend with the deepening of soil layer accept 40-60cm soil layers.
After different subtropical artificial forests replace the primeval forest and secondary forest, the compacted forestland surface soil structure and reduction of air permeability are not beneficial for the soil permeability and circulation and transfer of soil moisture, so the soil fertility reduces, thus affecting the growth of aboveground vegetations[4].The content of soil organic matter reduced with the deepening of soil layer thickness[5].
Table.1 Soil organic matter content of different vegetation patterns (g·kg-1) Soil layer (cm) P· sibirica land C· microphylla land P· simonii land U· pumila land Natural grassland P· tableulaeformis×P·sibirica land Secondary forest of natural bush land 0-10 9.86 4.59 11.19 13.43 10.27 14.20 18.87 10-20 10.86 3.36 8.27 11.88 5.55 8.28 18.00 20-40 5.05 1.96 8.65 10.57 3.12 8.83 20.65 40-60 9.93 3.63 5.27 10.70 4.70 10.67 13.25 60-100 10.75 2.06 9.58 10.23 2.82 7.53 12.07 average value 9.29 b 3.29 c 8.59 b 11.36 b 5.29 c 9.91 b 16.56 a Note:  The data within the same column with different small letters shows significant difference(P<0.05) The overall law presented by the soil organic matter under the same type of vegetation is that with the deepening of soil layer thickness, the organic matter content decreases.
Online since: January 2011
Authors: Shahrum Abdullah, Ahmad Kamal Ariffin, Ruslizam Daud, Al Emran Ismail
Using the finite element analysis (FEA) results and some data from literature, TCD applications is illustrated by a case study on engineering components in different geometrical notch radius.
The shear stress is expressed as, (13) when evaluated, the fatigue limit using PM (Eq. 14) and LM (Eq. 15) is expressed as: (14) (15) Based on experimental data from literature [8], the analytical comparison is conducted to identify and verify the behavior of related TCD concepts comparatively to existing prediction methods such as modified ElHaddad method and LEFM.
However for smaller crack or smaller notch radius, the data deviate from the LEFM line towards σo.
Fig. 2 and 3 also illustrate the variety of experimental data which obtained from a few literature [5,6,8].
It is well agreed that the LM give the best prediction compared to other method, with acceptable error around 10% - 20% from experimental data.
Online since: October 2010
Authors: Shahrum Abdullah, Mohd Zaki Nuawi, Zulkifli Mohd Nopiah, Mohd Basri Ali, Kamal A. Ariffin
The dynamic responses of the standard charpy impact machine are experimentally studied using the relevant data acquisition system in order to obtain the impact response.
One of the problems that arise with this alloy is the reduction in its durability.
However 50 kHz is selected because of its appropriate range data where the normalised peak PSD always occurs within that range.
(Hz) Time (millisecond) με2/Hz (a) (b) Fig. 2 The FEA based data plots for element #837 with different material frequency 50 kHz (a) time histories (b) PSD Strain rate(με/s) Freq.
(Hz) με2/Hz Time (millisecond) (a) (b) Fig. 3 The FEA based data plots for element #837 with different material frequency 100 kHz (a) time histories (b) PSD Strain rate(με/s) Time (millisecond) με2/Hz Freq.
Online since: June 2014
Authors: H. Tamjid Yamchello, R. Samin, A. Tamjidyamcholo, P. Bareji, A. Beheshti
Lean production as a method of cost reduction which improves the efficiency has been adopted by many SMEs to survive within these dynamic markets.
According to Zhou the main motivator for SMEs to adopt LPS is cost reduction.
Christer Karlsson and Pär Åhlström utilized data from a clinical field study and explored the applicability of the lean enterprise concept and its principles to small and medium-sized firms.
As such, lean production is a method of cost reduction that has been utilized by many SMEs.
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