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Online since: February 2026
Authors: Ruslan Sabah Abdulrahman, Farah Abdalsalam Ibrahim, Safaa H. Faisal, Tahseen A. Jabbar
As shown in Fig. 3, the comparison demonstrates excellent agreement between the present results and the published data across the evaluated domain.
Notably, near the boundary region asx/L→0.25 (where the temperature gradient becomes steep) the results from the present work align almost exactly with those of the reference data, capturing the expected rapid thermal transition adjacent to the heated surface.
However, despite the larger heating surface area, the isotherms near the top vertex begin to flatten, suggesting a reduction in convective efficiency due to spatial confinement.
The detected trend shows a reduction in Nu*as D increases from 0.1 to 0.5.
This will reduce the buoyancy driven transfer mechanism and leading to a reduction in the convective heat transfer efficiency.
Notably, near the boundary region asx/L→0.25 (where the temperature gradient becomes steep) the results from the present work align almost exactly with those of the reference data, capturing the expected rapid thermal transition adjacent to the heated surface.
However, despite the larger heating surface area, the isotherms near the top vertex begin to flatten, suggesting a reduction in convective efficiency due to spatial confinement.
The detected trend shows a reduction in Nu*as D increases from 0.1 to 0.5.
This will reduce the buoyancy driven transfer mechanism and leading to a reduction in the convective heat transfer efficiency.
Online since: December 2014
Authors: Jin Yang Xie, Lin Sun, Fa Yang Jin, Song He, Wan Fen Pu
A number of studies on foam quality have shown that foam exhibits mobility reduction properties where the foam quality is rated between 45% and 95% (Blauer,1974 [14]; Schramm,1994 [15]; Chang, 1998 [16]), which means the gas liquid ratio is between 0.9:1.1 and 19:1.
Gas and liquid injection rates define the quality of the foam formed (i.e. ratio of gas rate to total injection rate), which will also impact its mobility reduction characteristics(Schramm, 1994a [20]; Chang, 1999[21]).
Experimental process below is set up, theequipment include: constant temperature oven, inner diameter of which is 70cm×75cm×123cm, upper limit of temperature is 180℃, with pressure sensors, data is automatically collected into a computer.A constant flow pump provides stable flow of 0~40ml/min.
A computer data acquisition system.
How Can Selective Mobility Reduction of CO2-Foam Assist in Reservoir Floods.
Gas and liquid injection rates define the quality of the foam formed (i.e. ratio of gas rate to total injection rate), which will also impact its mobility reduction characteristics(Schramm, 1994a [20]; Chang, 1999[21]).
Experimental process below is set up, theequipment include: constant temperature oven, inner diameter of which is 70cm×75cm×123cm, upper limit of temperature is 180℃, with pressure sensors, data is automatically collected into a computer.A constant flow pump provides stable flow of 0~40ml/min.
A computer data acquisition system.
How Can Selective Mobility Reduction of CO2-Foam Assist in Reservoir Floods.
Online since: August 2019
Authors: Lia Ferrari
In this regard, the temporariness of the securing intervention highlights a strong vocation for reversibility, that is particularly appropriate when operating on cultural heritage in compliance with the principles of restoration (reversibility, compatibility, minimum intervention, recognizability), as recommended in the guidelines for "evaluation and reduction of seismic risk of cultural heritage with reference to the Technical Standards for Construction "- DPCM 9/2/2011 [1].
For example, the provisional devices mostly used in the past, the wooden rakers, entailed some downsides: they encumber large spaces in front of the structure and present difficulties of construction, impossibility to reuse the material, loss of effectiveness in facing new shocks and reduction of the efficiency of the material over time [2].
The comparison between the data collected before and after the installation of the scaffolding allowed to verify the effectiveness of the interventions for securing this macro-element.
For example, a comparison between the cost of the scaffolding installed to secure the southern transept of the Church of Jesus and the cost of the hooping made for the safety of the north transept (less damaged and with minor deformations than the southern one), shows a reduction in costs in the latter case.
Moreover, its progressive diffusion and the introduction of new composite materials has allowed a considerable reduction in costs.
For example, the provisional devices mostly used in the past, the wooden rakers, entailed some downsides: they encumber large spaces in front of the structure and present difficulties of construction, impossibility to reuse the material, loss of effectiveness in facing new shocks and reduction of the efficiency of the material over time [2].
The comparison between the data collected before and after the installation of the scaffolding allowed to verify the effectiveness of the interventions for securing this macro-element.
For example, a comparison between the cost of the scaffolding installed to secure the southern transept of the Church of Jesus and the cost of the hooping made for the safety of the north transept (less damaged and with minor deformations than the southern one), shows a reduction in costs in the latter case.
Moreover, its progressive diffusion and the introduction of new composite materials has allowed a considerable reduction in costs.
Online since: April 2014
Authors: Lei Miao, Hao Liang Cheng, Li Li Zhao, Cheng Yan Liu, Chao Li
All bands agree well with the reported data for VO2 (M) films [17].
Mo doping introduces donor defects at conductive band, the negative charge ionized (2e) from the donor defect is situated on the local energy level formed in forbidden band, thereby serving to the reduction of the forbidden band gap and induce a transition to the metallic phase.
The increase in Mo doping concentrations allows the reduction of Tc in a nonlinear proportion.
A reduction in Tc of approximately -10 °C/at.% is observed for films with low doping content, while the reduction efficiency decreases with higher dopant concentrations.
Mo doping introduces donor defects at conductive band, the negative charge ionized (2e) from the donor defect is situated on the local energy level formed in forbidden band, thereby serving to the reduction of the forbidden band gap and induce a transition to the metallic phase.
The increase in Mo doping concentrations allows the reduction of Tc in a nonlinear proportion.
A reduction in Tc of approximately -10 °C/at.% is observed for films with low doping content, while the reduction efficiency decreases with higher dopant concentrations.
Online since: November 2020
Authors: M.M. Abolhasani, Ali Sadeghi, Farbod Tondnevis, Reza Fekrazad, Hamid Keshvari, Mohammad Ali Ketabi
By increasing the amount of metronidazole which was not ionized in the solution, the enhancement of solution conductivity caused a reduction in fiber diameter [18-19].
Nano fiber diameter distribution (summarized data) Samples Median nanofiber diameter (nm) Min nanofiber diameter (nm) Max nanofiber diameter (nm) Porosity Percentage (%) A (control without drug) 300 ± 4 50 ±4 780 ± 4 60 ± 5 B (5 %) 225 ± 4 20 ± 4 1100 ± 4 75.5 ± 5 C (10 %) 330 ± 4 25 ± 4 1400 ± 4 66.5 ± 5 D (20 %) 240 ± 4 24 ± 4 1170 ± 4 77 ± 5 E (30 %) 120 ± 4 20 ± 4 670 ± 4 85 ± 5 According to Table 2 and Figure 1 the minimum fiber diameter of 20 ± 4 nm could be detected (sample 4 owing to 30% of drug content).
By reduction of the fiber’s median diameter, the sample’s porosity also increased up to 85 ± 5 % (P ˂0.05).
It seems that by the increment of drug content (in the solution) and possible reduction of solution viscosity, followed by the more stretching of the solution, the thinner fiber diameters were obtained [21].
This behavior may relate to the nanofiber diameter distribution where the enhancement of the drug content caused a reduction on nanofiber diameter and, thereafter, mechanical properties improved.
Nano fiber diameter distribution (summarized data) Samples Median nanofiber diameter (nm) Min nanofiber diameter (nm) Max nanofiber diameter (nm) Porosity Percentage (%) A (control without drug) 300 ± 4 50 ±4 780 ± 4 60 ± 5 B (5 %) 225 ± 4 20 ± 4 1100 ± 4 75.5 ± 5 C (10 %) 330 ± 4 25 ± 4 1400 ± 4 66.5 ± 5 D (20 %) 240 ± 4 24 ± 4 1170 ± 4 77 ± 5 E (30 %) 120 ± 4 20 ± 4 670 ± 4 85 ± 5 According to Table 2 and Figure 1 the minimum fiber diameter of 20 ± 4 nm could be detected (sample 4 owing to 30% of drug content).
By reduction of the fiber’s median diameter, the sample’s porosity also increased up to 85 ± 5 % (P ˂0.05).
It seems that by the increment of drug content (in the solution) and possible reduction of solution viscosity, followed by the more stretching of the solution, the thinner fiber diameters were obtained [21].
This behavior may relate to the nanofiber diameter distribution where the enhancement of the drug content caused a reduction on nanofiber diameter and, thereafter, mechanical properties improved.
Online since: October 2011
Authors: Jing Yu Ran, Liu Jie Zhao, Wei Feng Tu, Li Zhang
For example, when pressure changes from 0.1MPa to 0.2MPa, the mass fraction of carbon deposit is from 0.46% to 0.11% and the reduction is 0.35% at 823K.
While at 773K, the corresponding carbon deposit is from 0.64% to 0.04% and the reduction is 0.6% with the same change range of the pressure.
From the data and Fig 5, we can find that the Φ of the carbon deposit reduced more quickly than the H2 production and the methane conversion ratio under higher pressure zone.
If the pressure is too high, the reduction step of the carbon deposit, the H2 production and the CH4 conversion ratio is no longer obvious.
Ye: Practical handbook of thermodynamic data of inorganic, Beijing: Metallurgical Industry press(2002)
While at 773K, the corresponding carbon deposit is from 0.64% to 0.04% and the reduction is 0.6% with the same change range of the pressure.
From the data and Fig 5, we can find that the Φ of the carbon deposit reduced more quickly than the H2 production and the methane conversion ratio under higher pressure zone.
If the pressure is too high, the reduction step of the carbon deposit, the H2 production and the CH4 conversion ratio is no longer obvious.
Ye: Practical handbook of thermodynamic data of inorganic, Beijing: Metallurgical Industry press(2002)
Online since: October 2011
Authors: Ahmet Ç. Çilingir, Vahdet Uçar, Ismail Çallı
Laboratory studies have reported reductions in wear volume (up to twenty times less wear compared with that of metal on polyethylene), which potentially offers a reduction in degree of osteolysis.
The reported simulator studies have demonstrated that COM friction couples have very good wear coefficients in comparison to MOM and these bearings have shown no bedding in and further reduction in wear rates [20].
Although these data are encouraging there are no medium to long term clinical studies to support the use of COM bearings outside of a clinical trial.
The author believes that ceramic-on-metal friction couples would be better design for hip resurfacing arthroplasty, although they requires more in vivo clinical data.
The reported simulator studies have demonstrated that COM friction couples have very good wear coefficients in comparison to MOM and these bearings have shown no bedding in and further reduction in wear rates [20].
Although these data are encouraging there are no medium to long term clinical studies to support the use of COM bearings outside of a clinical trial.
The author believes that ceramic-on-metal friction couples would be better design for hip resurfacing arthroplasty, although they requires more in vivo clinical data.
Online since: March 2020
Authors: Zi Yao Wei
In addition to water permeability, the structure also has the characteristics of moisturizing, noise reduction, sound absorption, anti-slip, cold resistance and weather resistance.
Sound absorption and noise reduction performance, related research shows that for the road surface and the vehicle itself The noise reduction measures can fundamentally weaken the traffic noise source [10], greatly reduce traffic noise, and ensure the acoustic environment of residents along the line. 4.
This new brick-forming methods and materials also face many problems, for instance, the material has a short research time, lacks long-term durability data and corresponding specifications.
The first issue that needs to be solved is how to effectively combine geopolymers with raw materials and how to characterize and quantify, followed by consideration the amount of gelling agent and the influence of gelation time on strength, the water permeability can finally obtain quantitative data of the process.
Sound absorption and noise reduction performance, related research shows that for the road surface and the vehicle itself The noise reduction measures can fundamentally weaken the traffic noise source [10], greatly reduce traffic noise, and ensure the acoustic environment of residents along the line. 4.
This new brick-forming methods and materials also face many problems, for instance, the material has a short research time, lacks long-term durability data and corresponding specifications.
The first issue that needs to be solved is how to effectively combine geopolymers with raw materials and how to characterize and quantify, followed by consideration the amount of gelling agent and the influence of gelation time on strength, the water permeability can finally obtain quantitative data of the process.
Online since: April 2024
Authors: Edgar Ramos, Lourdes Banda, Nancy Sanchez
The results of the [12] after the implementation of RCM were obtained as results significant reductions as 29% with respect to machine breakdowns, 35% in the occurrence of defects and 15% in machine downtime.
According to [20] the low availability of the machines has therefore the reduction of mineral extraction levels in the mine, and consequently causes economic losses for the company.
The equipment's inactive periods are eliminated, and its optimal conditions are improved, allowing for a reduction of additional costs related to hiring third parties and production delays, hence increasing operational efficiency.
Guerra, “Data-Driven Condition Monitoring of Mining Mobile Machinery in Non-Stationary Operations Using Wireless Accelerometer Sensor Modules,” IEEE Access, vol. 9, pp. 17365–17381, 2021, doi: 10.1109/ACCESS.2021.3051583
Rathore, “Application of data mining for spare parts information in maintenance schedule: a case study,” J.
According to [20] the low availability of the machines has therefore the reduction of mineral extraction levels in the mine, and consequently causes economic losses for the company.
The equipment's inactive periods are eliminated, and its optimal conditions are improved, allowing for a reduction of additional costs related to hiring third parties and production delays, hence increasing operational efficiency.
Guerra, “Data-Driven Condition Monitoring of Mining Mobile Machinery in Non-Stationary Operations Using Wireless Accelerometer Sensor Modules,” IEEE Access, vol. 9, pp. 17365–17381, 2021, doi: 10.1109/ACCESS.2021.3051583
Rathore, “Application of data mining for spare parts information in maintenance schedule: a case study,” J.
Online since: March 2007
Authors: Liang Meng, J.B. Liu
%Ag in our unpublished data.
%Ag drawn to a reduction in area of 99%.
The reduction of dislocation density after heavy drawing could also be observed in the Cu-24 wt.
Electrical conductivity Some presented data of the conductivity with different Ag contents are summarily given in Fig. 3.
Therefore, the development of a third constituent added to conventional binary alloys with low Ag contents is usually aimed at further strength improvement and cost reduction in raw materials.
%Ag drawn to a reduction in area of 99%.
The reduction of dislocation density after heavy drawing could also be observed in the Cu-24 wt.
Electrical conductivity Some presented data of the conductivity with different Ag contents are summarily given in Fig. 3.
Therefore, the development of a third constituent added to conventional binary alloys with low Ag contents is usually aimed at further strength improvement and cost reduction in raw materials.