Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: September 2014
Authors: Zhi Da Li, Ping Zhang, Xiao Jun Lu
Afterwards, the contraction data reading date is set 1d, 3d, 7d, 14d, 28d, 45d, 60d, 90d, 120d, 150d, 180d and 360d.
Both adding fly ash merely (S2, S3 and S4) and adding fly/slag (S5, S6 and S7) can effectively reduce concrete shrinkage, whose reduction magnitude is up to 30%-53%.
Meanwhile, reduction of water-cement ratio can also enlarge density of concrete.
Many researches have proved that shrinkage is change of pressure on hole wall caused by dehydration within internal structure of concrete, resulting in volume reduction [4, 5].
Long-tern property analysis shows that both adding fly ash merely and adding fly/slag can effectively reduce concrete shrinkage, whose reduction magnitude is up to 30%-53%.
Online since: October 2013
Authors: Bo Zhang, Xiao Lei Wang
They found that compared with the untextured UHMWPE, surface texture produced significant reduction (42%) in the friction coefficient under bovine serum lubrication.
The result indicated that under a dry-sliding condition with loads ranging from 60 to 200 mN, the textured UHMWPE performed a friction reduction of 8% to 35%, and wear depth and width were also lower than the untextured UHMWPE.
The stable friction coefficient data in the last minute is averaged and used as the result of test.
At the load of 100N, with the same dimples diameter of 50μm, same depth 10μm, when the area density is between 5% and 29.9%, textured UHMWPE shows a significant effect of friction reduction shown in Fig.6(a).
When increasing the load to 700N, all the textured specimens present significant effect of friction reduction though at different rotational speeds. the dimple pattern with area density of 22.9% has the lowest friction coefficient, which decreases 72.1% at the condition of 50rpm and 55.3% at 200rpm (Fig.6(b)).
Online since: September 2018
Authors: Konstantin A. Tsapko, Marina Y. Alyaeva
Results and Discussion The operational requirements and economic considerations leading to the reduction in the schedule should not interfere with the technologically appropriate and continuous workflow.
The following opportunities are the five key ones of the industrial objects construction schedule reduction: · a thorough pre-design planning based on the preliminary analysis of the initial data; · an increase in manpower and materials as well as the technical resources of construction; · matching of consequent works in time; · elimination of interdependencies between jobs by making technical or technological amendments in the project; · managerial arrangements.
On the whole, the two mentioned aboveaches are advantageous and rather cost-effective but only with a huge volume of works and observing the following conditions: · sufficient space to allow the required amount of work to the available technical and human resources; · any additional expenses for preparatory or subsidiary works made with highly productive machinery should definitely be paid off by increased labor efficiency and, accordingly, reduction in the schedule.
There is a wide variety of schedule reduction in this field, however one should consider both time-and-cost relations and also the list of weak and strong points of every technology available.
Online since: August 2013
Authors: Zhen Jing, Jing Yi Li
Science study suggests that, in order to have a 50% chance to avoid dangerous climate change, we must stabilize greenhouse gas concentrations in the atmosphere in 2050 below 450ppm per million CO2e. carbon budget, which is the maximum limit of CO2e emissions between the present and a future date in order to achieve the required concentration, is more useful than the emission reduction targets.
The target of emission reduction is a way to keep in the budget.
According to the Bali Roadmap agreed in December 2007, developed countries agreed to accept the new quantified emission limitation and reduction objectives, developing countries agreed to take nationally appropriate mitigation action.
The Terrestrial Carbon action is helpful to fulfill those commitments. Ⅱ.The content of Credible Terrestrial Carbon Market Mechanism A .Guide principles The Terrestrial Carbon organizations proposed that terrestrial carbon action which is subject to the following nine guiding principles will effectively promote the solution of the problem of climate change[1]: 1.Maximize the long-term terrestrial carbon stocks. 2.Maintain existing terrestrial carbon and create new terrestrial carbon. 3.Incorporate all types of terrestrial carbon (adopt a phased manner, starting from peat lands, forest and secondary forest land which can be turned into carbon and CO2.). 4.Use a variety of complementary ways (market and non-market, public and private). 5.Take terrestrial carbon action beyond reducing global greenhouse gas emissions, rather than replace these emission reduction measures. 6.
It wish participated developing countries to establish the infrastructure and expertise (via the terrestrial carbon data collection and analysis of satellite remote sensing and in situ measurements); on the amount of carbon sequestration in the specific types of landforms and different land use agree on the method for determining the influence of the sequestration of carbon; determine and audit of the national terrestrial carbon stocks; take the effective way to make forest-dependent countries, and countries participating in the mechanism depends on deforestation and forest degradation; implement transparent process to clear the land, vegetation and ownership and use of carbon credits; establish credibility and transparent mechanisms and institutions to carry out the following tasks: measuring terrestrial carbon; project level and the national level of certification, verification and audit results; monitoring with the space and time of the change; establishment of national terrestrial carbon
Online since: November 2007
Authors: Enrique Nava-Vázquez, Enrique Díaz Barriga-Castro, Armando Salinas-Rodríguez
In general, curves of reduction of area at fracture (RA) as a function of temperature exhibit a ductility trough which is invariably associated with intergranular fracture [1].
As far as it known by the present authors, this type of data is not presently available for Si-Al GNO electrical steels.
Figure 5 illustrates the temperature dependence of the reduction of area at fracture for hot rolled Si-Al GNO electrical steel tested in tension after a solution treatment at 1250 °C [3].
) (111)γγγγ (110)αααα 750 775 805820 835 850 °°°°2θ2θ2θ2θ 41 42 43 44 45 Intensity (a.u.)0 20 40 60 80 100 800 900 1000 1100 1200 1300 Temperature (°C) Reduction of Area at Fracture (%) Tγγγγ=1250 °C Figure 5.
Temperature dependence of the reduction of area at fracture for hot rolled Si-Al GNO electrical steel tested in tension after a solution treatment at 1250 °C [3].
Online since: July 2012
Authors: Guo Dong Cui, Yan Shuo Zhang, Wu Qian Chai, Bing Xue Nie
The tensile test data are shown in Table 2.
While its surface was hardened, the percentage elongation after fracture and percentage reduction of area of this sample decreased remarkably.
Table 2 Results of the tensile test Technology Tensile strength /MPa Yield strength /MPa Percentage elongation /% Percentage reduction /% Un-treated 447.2 361.3 25.7 51.2 Nitrided and nickel plated 505.7 463.2 13.8 21.4 Nitrided, nickel plated and sintered 438.9 349.8 15.8 25.6 Salt spray corrosion test.
Furthermore, the percentage elongation after fracture and percentage reduction of area of the surface-micropored sample reduced a lot shown in Table 2.
The results of the tensile test indicate that the tensile strength and yield strength of the surface-micropored sample are slightly lower than that of the raw material, but the percentage elongation and percentage reduction decrease apparently.
Online since: November 2013
Authors: Xiao Jun Xiang, Yan Shuang, Kui Gong
In order to further explore the source of ore lead in the Shidi Pb-Zn ore deposit we projected its isotopic composition data points onto Zartman plumbum tectonic model diagram[15] (Fig.2).
The data points of one sample fall within the field of upper crust-source lead, and those of all the rest samples fall within the critical field of upper crust-source lead and subduction- belt lead resultant from mixing of upper crust-source lead and mantle- source lead.
That is favorable to the reduction of sulfates, thus creating a source of sulfur.
Preliminary sulfur isotope data of diagenetic and vein sulfides in the Lower Palaeozoic strata of Ireland and southern Scotland: Implications for Zn+Pb+Ba mineralization.
Carbon and sulfur isotope evidence for in situ reduction of sulfate in Nanisivik zinc-lead deposits, Northwest Territories, Baffin Island, Canada.
Online since: February 2014
Authors: Xin Min Wu, Hao Shu Wu
According to the 4G network structure of a system pattern diagrammatic drawing of IPv6 The wiretap, in a wireless link or a service within a network of tapping the user data, signaling data and control data; The camouflage, disguised as a network element intercepts user data, signaling data and control data, the pseudo terminal deception network access services; The flow analysis, active or passive flow analysis in order to obtain information on the time, speed, length, source and destination; The data integrity, modify, insert, delete, replay the user data or signaling data for data integrity; The denial of service, physically or agreement on interference to the user data, signaling data and control data in a wireless link to the correct transmission of denial of service attack; He denied, denying business expenses business users, data sources and sending or receiving the data to other users, network unit that provides the network service; The unauthorized access of user service, abuse
On the other hand in the IPv6 network security problems: Based on the rapid IPv6 packet capture and high-speed address matching technology research : uses the special-purpose card driver for high speed packet capture using protocol analysis, analytical technology makes the computation required a substantial reduction, improving the testing speed; The flow characteristic analysis based on IPv6 technology research: monitoring the network traffic, analyze the data packets, the packet according to the type, source IP address, the destination IP address, source port, destination port number and other information, the use of protocol analysis technique for the determination of IPv6 under the environment of network traffic characteristics; The IPv6 based vulnerability attack event characteristics and behavioral research: monitoring, analysis of network flow data, find out the unreasonable code, malicious code and incomplete data packet; check for network applications and data consistency, accuracy
Network layer mobility is 4G mobility management mobility key, usually involves in different segments roaming of mobile subscribers, the data link layer mobility supporting usually limit in the same network.
When establishing a connection to the IPv6, will be at the ends of the host packets on the IPSec package, intermediate router for IPSec extension header IPv6 packet transmission, through the communication terminal authentication and data encryption protection, so that the sensitive data in IPv6 network security transmission, therefore, without the need for special network application deployment of ALG ( application layer gateway ), we can guarantee the end-to-end network transparency, is beneficial to improve the network speed of service.
Analysis of IPv6 technology:Based on the rapid IPv6 packet capture and high-speed address matching analysis : uses the special-purpose card driver for high speed packet capture using protocol analysis, analytical technology makes the computation required a substantial reduction, improving the testing speed; The flow characteristic analysis based on IPv6 technology research: monitoring the network traffic, analyze the data packets, the packet according to the type, source IP address, the destination IP address, source port, destination port number and other information, the use of protocol analysis technique for the determination of IPV6 under the environment of network traffic characteristics;The IPv6 based vulnerability attack event characteristics and behavioral research: monitoring, analysis of network flow data, find out the unreasonable code, malicious code and incomplete data packet; check for network applications and data consistency, accuracy on the user's normal activity for statistical
Online since: February 2013
Authors: Ge Zhang, Sheng Nan Gao, Wen Ding Wei, Qiu Jian Xu
The exponential decay rate formulas for the two flavors were obtained from experimental data and the solution of the theoretical model.
The simulated emission processes of the two flavor components were compared with experimental data as shown in Fig. 3 and Fig. 4 (R2=0.983 and 0.958 respectively).
Simulation results fitted well with the experimental data in the stable emission period after the first 4 minutes.
Fig.3 Comparison between the simulated results and experimental data of limonene Fig.4 Comparison between the simulated results and experimental data of menthone The emission rate can be obtained from the solution of the eq.4.
The partition coefficients and emission rates of the two components were solved with the combination of the theoretical model and the experimental data.
Online since: November 2025
Authors: Levan Chkhartishvili, Otar Tsagareishvili, Natia Barbakadze, Roin Chedia, Tamar Korkia, Shalva Kekutia, Vladimer Mikelashvili, Ketevan Sarajishvili, Jano Markhulia, Irma Jinikashvili
Spectroscopic data, as well as EDS and XRD analyses, have shown that the GO samples obtained in both cases are almost identical.
These results correspond to the available data on processes that use flake graphite as a precursor.
Similar data for GO(graphite) are D: 1326 and 178 cm–¹ and 228 and G: 1598 and 68 cm–¹ and 225, respectively, at ID/IG = 1.01.
For rGO, this ratio decreased in proportion to the degree of the reduction.
Guo, Reduction of graphene oxide via L-ascorbic acid, Chem.
Showing 10371 to 10380 of 40357 items