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Online since: September 2012
Authors: Paola Persico, Cosimo Carfagna
The name cosmeto-textiles has been coined for textiles with cosmetic properties, but these types of textiles can also harbour other active compounds, such as mosquito repellents, odour reducers, UV-protection agents or fragrances.
Microencapsulation Technology Microencapsulation technology was utilised in the early 1980s by the US National Aeronautics and Space Administration (NASA) with the aim of managing the thermal barrier properties of garments, in particular for use in space suits.
Generic structure of a microcapsule Many different techniques are available for encapsulation, the choice of which depends on factors such as [9]: (a) What functionality must the capsule provide to the finished product?
Lycra is another firm in this emerging industry that has incorporated microcapsules with cosmetic properties in its fabrics.
Sakarkar, Microencapsulation Techniques, Factors Influencing Encapsulation Efficiency: A Review, The Internet J.
Online since: February 2024
Authors: Mochamad Chalid, Dedi Priadi, Rina Ningtyas, Shanaz Nadya, Muryeti Muryeti
The addition of nanoparticles was carried out to improve the properties of bioplastic packaging.
In addition, the incorporation of nanoparticles into biopolymers can lead to the development of materials with better physical-mechanical properties [6].
Nanotechnology can improve mechanical and antimicrobial properties so that it has the potential to be developed as food packaging [7].
Research on developing the functional properties of bioplastics using silver nanoparticles (AgNPs) has been carried out on aren starch, with results that this compound is suitable for antibacterial coatings, with the best composition that fulfills all mechanical properties and has better antimicrobial properties 3 wt% [8].
Formation of polar groups such as -OH groups showed that the hydrophilicity of AgNPs was affected by the type of stabilizer used [13].
Online since: July 2024
Authors: S. L. Akingbonmire, C.O. Okonkwo, P.O. Kayode, K. Akinsanmi
., into the concrete which affect the reinforcements in the concrete by triggering corrosion; the structure is then susceptible to failure.
Shrinkage cracks, chemical reaction cracks, alkali-aggregate and clay in aggregate cracks, sulphate attack cracks, thermal contraction cracks, segregation cracks, formwork deformation cracks, settlement cracks, freezing and thawing cracks, corrosion cracks, cracks due to applied loads, static loading and fatigue are some of the cracks affecting concrete in their plastic and hardened states [4].
The capsules must not affect the workability and mechanical properties of the concrete.
However, when the capsules are broken, they leave a void in the concrete which affects the mechanical strength of the concrete and they are not very much workable.
Results and Discussion 3. 1 Slump and Compaction Factor Test According to CivilSir [16], concrete with very low workability has a slump value of 0 – 25 mm and a compaction factor value in the range of 0.75 to 0.80; low workability has a slump value of 25 – 50 mm and a compaction factor value of 0.87; medium workability has a slump value of 50 – 100 mm and a compaction factor value of 0.9375; high workability has a slump value of 100 – 175 mm and a compaction factor value of 0.90.
Online since: October 2014
Authors: Qing Liu, Nan He, Jian Wen Wang, Wei Dong Zhang
The electrical equipment accident is the main problem of affecting electric system security, reliability, stability, economic operation.
However, when the insulating medium in the process of manufacturing, installation and long-term operation of the transformer, insulation properties deteriorated gradually, forming a partial discharge, adding insulation structure damage, causing power grid accident Analysis of Power Transformer Typical PD Type Transformer has a complex internal structure, and the electric field distribution is not uniform.
However, high-voltage switchgear insulation will gradually deteriorate by the environmental impact, human activity and other factors during the manufacture, installation and long run.
For oil circuit breakers, the most common failure is breaker affected with damp.
Insulator electrical performance mainly include insulator flashover characteristics, all kinds of electrical properties under the overvoltage, the filth flashover characteristics and oil-frequency breakdown characteristics.
Online since: February 2020
Authors: Alok Kumar Das, Nitesh Kumar, Harish Bishwakarma, Prasenjit Sharma, Purshottam Kumar Singh
The result reveals that voltage was the most significant factor for both MRR and HTA followed by electrolyte concentration and duty factor.
It was reported that concentration of electrolyte and voltage are the most prominent factors influencing the heat affected zone.
It was observed that voltage was the most significant factor followed by electrolyte concentration and duty factor.
Singh, Electrochemical discharge machining: A review on preceding and perspective research, Proceedings of the Institution of Mechanical Engineers, Part B: J.
Zhuang, A study to explore the properties of electrochemical discharge effect based on pulse power supply, Int.
Online since: June 2012
Authors: Shuang Mei Li
Laser shock processing (Laser Shock Processing, referred to as LSP) technology is based on high-power short-pulse laser irradiation of metal materials from the rapid vaporization of surface material to form high-temperature high-pressure plasma, because of its high-pressure shock wave expansion of the blasting in the material produced within the spread, surface and to produce plastic deformation shock layer, so as to improve the mechanical properties of metallic materials of a new surface modification technology[2].
According to the relation of power density of the laser pulse and the stress of shock wave, we could get the following relation (kPa)=0.10()Z()× I()> (4) Here,make the aluminum-K9 glass medium Z value as 1.37×10,and a as 0.1, in this case,: ()=20.7 ×() (5) The dynamic yield strength of aluminum target material valued as Ph=530,χ=0.14mm, and substitute it into equation (5), the following is the result: (6) Considering of the pulse width and energy of laser The width of the laser is a main factor that could affect the depth of the intensified layer.
Besides, with the size of the material’s increasing, the optical pump becomes uneven, which would affect the quality of the output beam[4].
As a result, series of machineries’ performance would be affected.
Online since: April 2013
Authors: Ivan Tomašić, Zrinaka Vidovic-Tisanic
The economic factors significantly decreased the number of active quarries and natural stone varieties on the domestic market.
High decorative, physical and mechanical properties of small stone blocks and tombolons have also great positive influence on possible profitable exploitation and processing.
High decorative, physical and mechanical properties of small stone blocks have also positive significant influence on market prices and efficiency of exploitation.
The shape of ore body depends on a number of different geological factors.
In particular, this will affect the sustainable management of stocks of natural stone.
Online since: November 2010
Authors: Wen Ming Zhang, Jue Yang, Chun Hui Yang, Wei Dong Luo
Through FEM analysis of the frame of 170t dump truck and other more structures frame, under the situation of fully loaded condition and lifting condition, the stress level of the bottom steel board of the frame carling and LOCS is one of the important factors of affecting the stress level of the whole frame under the precondition of that structure and shape size of the frame and the frame carling is unchangeable [1,2].
Because only thinking about material elastic property not researching plastic property, the stress peak value appears at 1.8s around, and it is about 989MPa.
Because only thinking about material elastic property not researching plastic property, the stress value reaches about 1424MPa at 6s.
It provides datum support for researching property of LOCS and frame during lifting
Journal of Mechanical Engineering, Vol.45 No.6 (2009), p. 262-266
Online since: May 2013
Authors: Yu Hou Wu, Ke Zhang, De Hong Zhao, Xuan Mu
Introduction With the development of mechanical science, the new demands on the mechanical design is how to improve the utilization of materials and reduce the manufacturing costs of the machine.
Therefore, the dynamic characteristics of the cross beam will directly affect the precision of the machine.
At the same time, the properties of intermediate densities are penalized artificially relative to the objective function, such as the SIMP model of the minimum compliance issues [2].
The relational expression based on the SIMP method based topology optimization is shown in Equation,Where represents unit initial elastic modulus and E is the optimized elastic modulus and p is the penalty factor.
Chinese Journal of Mechanical Engineering Vol.41 (2005), p. 13-172 [4] Q.
Online since: November 2011
Authors: Yi Xiang Fang, Xiao Yang Liu, En Fu Liu
The factors which affect the choice of machining scheme are dynamic, and can not conduct qualitative description.
Therefore, a reasonable machining scheme decision-making process can be looked as a fuzzy reasoning process: 1) Determining the domain of discourse U :U={u1,u2,…,un}, the factors set V :V={v1,v2,…,vn}, the evaluation of various factors set Ri: Ri={ri1,ri2,…,rim}, and the weight set W: W={w1,w2,…,wn}, wi≥0, i=1, 2, …, m.
Set A is made up of machining step and property of faces and holes, and its factor is factor of polychromatic sets.
Property of faces and holes respectively represents b1 and b2.
All factors individual color of polychromatic sets will be expressed in the form of contour matrix: ||ci(j)||A, F(A)=[A×F(A)].
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