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Online since: September 2021
Authors: Abílio P. Silva, André Studart, António Albuquerque, Victor Cavaleiro, Leonardo Marchiori
A water treatment sludge (WTS) was characterized in order to evaluate if its properties would be suitable for use as liner of earthworks or for clayey soil strengthening.
Its geotechnical properties seem to be suitable for producing liner materials and for reinforcing weakened clay soils.
Physical properties of soil such as density, Atterberg limits, water content and grain size are important for liner design, in addition, hydraulic conductivity lower than 1 x 10-7 cm/s, mechanical strength, at least 5 N/mm2, and good compaction conditions are the most significant factors for liner performance [5], [6].
Nevertheless, these geotechnical properties are important for successfully enhancing abovementioned characteristics and, thus, reinforcing soft soils besides waterproofing liners.
O’Kelly, “Geotechnical properties of a municipal water treatment sludge incorporating a coagulant,” Dublin, Jun. 2006.
Its geotechnical properties seem to be suitable for producing liner materials and for reinforcing weakened clay soils.
Physical properties of soil such as density, Atterberg limits, water content and grain size are important for liner design, in addition, hydraulic conductivity lower than 1 x 10-7 cm/s, mechanical strength, at least 5 N/mm2, and good compaction conditions are the most significant factors for liner performance [5], [6].
Nevertheless, these geotechnical properties are important for successfully enhancing abovementioned characteristics and, thus, reinforcing soft soils besides waterproofing liners.
O’Kelly, “Geotechnical properties of a municipal water treatment sludge incorporating a coagulant,” Dublin, Jun. 2006.
Online since: September 2023
Authors: Juluru Sandeep, A.V.S.S. Kumara Swami Gupta
Sandeep1,a,2,b*, AVSS Kumara Swami Gupta3,c
1PhD Scholar, Mechanical Engineering, JNTUH College of Engineering Hyderabad, Telangana, India
2Assistant Professor, Aero Engineering, SOET, Sandip University, Nashik, Maharashtra, India
3Professor, Mechanical Engineering, JNTUH College of Engineering Hyderabad, Telangana, India
Email id: ajulurusandeep@ gmail.com, bsandeep.juluru@sandipuniversity.edu.in, cavs_gupta@jntuh.ac.in
Keywords: Shock wave angle, Deflection angle, Cowl, Total Pressure Ratio, Shock on lip condition.
The main objective of the present paper is to develop a detailed design procedure for Scramjet intake based on the factors discussed for various operating conditions and the design is to be verified by CFD simulations.
In the compression process while developing pressure will make the adequate loss of kinetic energy and thus affects the thrust-generating capability of the engine.
The decrease in height of the isolator will affect the mass flow requirement which is to be considered for high Mach numbers greater than 8.
Table 1: Flow properties across shock waves Parameters M0 M1 P1P0 ρ1ρ0 T1T0 M2 P2P1 ρ2ρ1 T2T1 M3 P3P2 ρ3ρ2 T3T2 CFD 5 4 3.04 2.12 1.64 3.3 2.9 2.08 1.41 2.8 3.1 2.64 1.87 Python Code 5 4 2.82 2 1.42 3.25 2.82 2.1 1.42 2.6 2.8 2.7 1.8 Conclusions This paper illustrates the procedure for the design of double ramp hypersonic intake using an analytical approach by considering the maximum recovery of total pressure, equal shock strengths and the Mach number condition of the isolator entrance.
The main objective of the present paper is to develop a detailed design procedure for Scramjet intake based on the factors discussed for various operating conditions and the design is to be verified by CFD simulations.
In the compression process while developing pressure will make the adequate loss of kinetic energy and thus affects the thrust-generating capability of the engine.
The decrease in height of the isolator will affect the mass flow requirement which is to be considered for high Mach numbers greater than 8.
Table 1: Flow properties across shock waves Parameters M0 M1 P1P0 ρ1ρ0 T1T0 M2 P2P1 ρ2ρ1 T2T1 M3 P3P2 ρ3ρ2 T3T2 CFD 5 4 3.04 2.12 1.64 3.3 2.9 2.08 1.41 2.8 3.1 2.64 1.87 Python Code 5 4 2.82 2 1.42 3.25 2.82 2.1 1.42 2.6 2.8 2.7 1.8 Conclusions This paper illustrates the procedure for the design of double ramp hypersonic intake using an analytical approach by considering the maximum recovery of total pressure, equal shock strengths and the Mach number condition of the isolator entrance.
Online since: November 2017
Authors: Bryan B. Pajarito, Winna Faye F. Mangaccat, Maelyn Rose M. Tigue, Monica T. Tipton
The intercalation of rubber molecules in the clay galleries results in the collapse of the stacked layered structure, dispersion of exfoliated clay particles in the rubber matrix, and creation of nanocomposites with improved thermal and physical properties.
Other fatty acids of different chain lengths (palmitic, stearic, eicosanoic, and docosanoic acid) were tested by Rooj et al. [11] to swell organo-montmorillonite, with docosanoic acid showing the most favorable mechanical properties.
Previous studies have already shown that the inclusion of treated clay in rubber could enhance its mechanical properties [4,7,10,12] due to improved dispersion of fillers in the rubber matrix.
This also agrees with the observed increase in tensile and compressive properties of NR after clay addition from a previous study [26].
The factors can be ranked as follows according to magnitude of effect: ion exchange with HDA salt > sodium activation with NaCl > wet grinding time > modification with CDEA.
Other fatty acids of different chain lengths (palmitic, stearic, eicosanoic, and docosanoic acid) were tested by Rooj et al. [11] to swell organo-montmorillonite, with docosanoic acid showing the most favorable mechanical properties.
Previous studies have already shown that the inclusion of treated clay in rubber could enhance its mechanical properties [4,7,10,12] due to improved dispersion of fillers in the rubber matrix.
This also agrees with the observed increase in tensile and compressive properties of NR after clay addition from a previous study [26].
The factors can be ranked as follows according to magnitude of effect: ion exchange with HDA salt > sodium activation with NaCl > wet grinding time > modification with CDEA.
Online since: March 2004
Authors: Wen Ji Xu, Jian Jiang Zhou, X.B. Zhai, Gui Bing Pang, Han Yun Li
Zhou
School of Mechanical Engineering, Dalian University of Technology, Dalian, 116023, China
Keywords: Pulse electrochemical finishing, Flow-field, Flow rate, Interelectrode gap
Abstract.
The interelectrode gap is a key factor influencing the surface quality in PECF.
It is clear that variant electrolyte supply extremely affects the surface topography.
It is clear that the working gap extremely affects the surface topography by PECF.
Conclusions 576 Advances in Grinding and Abrasive Processes From the above results, its evident that the flow-field and the interelectrode gap are the key factors that affecting the surface quality in PECF.
The interelectrode gap is a key factor influencing the surface quality in PECF.
It is clear that variant electrolyte supply extremely affects the surface topography.
It is clear that the working gap extremely affects the surface topography by PECF.
Conclusions 576 Advances in Grinding and Abrasive Processes From the above results, its evident that the flow-field and the interelectrode gap are the key factors that affecting the surface quality in PECF.
Online since: February 2012
Authors: Zheng Hua Liu, Yan Ren, Rui Zhou
The terminal sliding mode (TSMC) control was developed by introducing the nonlinear item into the sliding mode, which offers some superior properties such as fast, finite time convergence and better tracking precision [9].
Parameter ,,and affect the arriving time, so appropriate value must be selected to ensure the converging speed.
The classical PID control is employed in the acceleration feedback controller, as shown in figure 1; the control law is defined as: (11) where is integral factor of the controller, is proportional factor of the controller, is differential factor of the controller, and they are positive real numbers.
Conclusions Opto-electronic stabilized platform is a kind of servo system with uncertainties and disturbances (such as nonlinear friction factors).
Liu : Decomposition-based friction compensation of mechanical systems[J].
Parameter ,,and affect the arriving time, so appropriate value must be selected to ensure the converging speed.
The classical PID control is employed in the acceleration feedback controller, as shown in figure 1; the control law is defined as: (11) where is integral factor of the controller, is proportional factor of the controller, is differential factor of the controller, and they are positive real numbers.
Conclusions Opto-electronic stabilized platform is a kind of servo system with uncertainties and disturbances (such as nonlinear friction factors).
Liu : Decomposition-based friction compensation of mechanical systems[J].
Online since: May 2015
Authors: Yuriy Ivanovich Pashkov, Mikhail Alekhsandrovich Ivanov, Yuriy Viktorovich Bezgans, Tatyana Vladimirovna Bezgans
Introduction
While the manufacture of welded pipes the base metal (BM), the heat-affected zone (HAZ) and the zone of welded joint metal (ZJM) in the forming process, calibration, expansion, and hydraulic testing are exposed to the significant plastic deformation, which can substantially affect the reduction of the bearing capacity of the different zones of a welded joint and a pipe in general.
The result is a hardening of metal in HAZ, the plastic properties reduce and the pipe failure can cause.
The influence of the broadening and ovality of the pipe, reinforcement of welded joints and other factors influencing the plasticity zones of the weld joint was tested.
It is established that regardless of various factors ZJM is plastically deformed mainly only at the stage of forming the ring (Fig. 2).
In addition, the formation of the plasticity zone of welded pipe joints may show the influence of mechanical, structural and geometric heterogeneity of a welded pipe joint.
The result is a hardening of metal in HAZ, the plastic properties reduce and the pipe failure can cause.
The influence of the broadening and ovality of the pipe, reinforcement of welded joints and other factors influencing the plasticity zones of the weld joint was tested.
It is established that regardless of various factors ZJM is plastically deformed mainly only at the stage of forming the ring (Fig. 2).
In addition, the formation of the plasticity zone of welded pipe joints may show the influence of mechanical, structural and geometric heterogeneity of a welded pipe joint.
Online since: April 2014
Authors: Yan Wang, Zhi Feng Liu, Ying Han, Jun Dai, Shao Feng Ge
Therefore, we must show city cultural characteristics of the city from urban design and landscape point of view according to the spatial size, environmental characteristics and cultural characteristics of the times and other factors during the construction of public facilities.
It mainly embodied as that public facilities are fair to all users without affecting by the limitation of factors such as physiological difference, gender, age, religion background, education degree.
This is the difference between public facilities and the private property.
Beijing: mechanical industry publishing house, 2009 [4] He zhengyou, NingLing.
Beijing: intellectual property press, 2003
It mainly embodied as that public facilities are fair to all users without affecting by the limitation of factors such as physiological difference, gender, age, religion background, education degree.
This is the difference between public facilities and the private property.
Beijing: mechanical industry publishing house, 2009 [4] He zhengyou, NingLing.
Beijing: intellectual property press, 2003
Online since: June 2014
Authors: Zhi Yu Jia, Zhao Yang Zeng, Yang Zhou, Bin Tian, Yan Zhou
l Causality relation, reflecting the “cause-result” relation between concepts of fault cause and fault modes, fault modes and fault affects.
l The function of depth factor of concept C in generalization relation is Eq.1
The density factor β that reflects the density factor of concept is defined as follows.
is adjustment coefficient that used to adjust the importance of density factor to depth factor .
Compared to the depth factor, density factor has less effect on the semantic distance, so the range of is [0, 1]
l The function of depth factor of concept C in generalization relation is Eq.1
The density factor β that reflects the density factor of concept is defined as follows.
is adjustment coefficient that used to adjust the importance of density factor to depth factor .
Compared to the depth factor, density factor has less effect on the semantic distance, so the range of is [0, 1]
Online since: September 2012
Authors: Bao Song Wu, Xiao Nan Li, Bao Xin Guo, Li Zhi Xiao
The aim is to determine the composition and properties of fluids in situ real-time.
But because of its semiconductor property, the loss introduced by the substrate will cause SNR to reduce.
While glass is good insulator with large dielectric constant, and the corresponding quality factor Q of the stripline probe can be significantly improved.
Considering the dielectric loss and processing properties, glass is a good choice.
Saillen, F.Vincent, et al, Microfabrication of Helmholtz coils with integrated channels for NMR spectroscopy, IEEE Micro Electro Mechanical Systems.
But because of its semiconductor property, the loss introduced by the substrate will cause SNR to reduce.
While glass is good insulator with large dielectric constant, and the corresponding quality factor Q of the stripline probe can be significantly improved.
Considering the dielectric loss and processing properties, glass is a good choice.
Saillen, F.Vincent, et al, Microfabrication of Helmholtz coils with integrated channels for NMR spectroscopy, IEEE Micro Electro Mechanical Systems.
Online since: January 2012
Authors: Ji Lin Yu, Zhi Jun Zheng
Much understanding of the microstructural effects on the dynamic mechanical properties has been achieved.
The plateau stress is an important property to characterize the dynamic response of cellular materials and it is defined as , (4) where εy is the yield strain and εD the densification strain [10,11].
At a low impact velocity, the crushing bands are induced by many factors such as the weakest links, the boundary conditions and the height-to-width ratio of specimen, but at a high impact velocity the crushing bands are mainly caused by inertia [2].
In this case, the defects far ahead of the wave front will not affect the response of honeycomb.
Effects of meso-structure on the mechanical behavior and multi-objective optimization design of cellular metals.
The plateau stress is an important property to characterize the dynamic response of cellular materials and it is defined as , (4) where εy is the yield strain and εD the densification strain [10,11].
At a low impact velocity, the crushing bands are induced by many factors such as the weakest links, the boundary conditions and the height-to-width ratio of specimen, but at a high impact velocity the crushing bands are mainly caused by inertia [2].
In this case, the defects far ahead of the wave front will not affect the response of honeycomb.
Effects of meso-structure on the mechanical behavior and multi-objective optimization design of cellular metals.