Search results

Soil permeability, one of the important physical properties of soil, is closely related to water supply intensity, soil structure and soil moisture conditions.
At this moment, infiltration rate is affected not only by the level of soil properties, structure and profile, but also by the impact of soil moisture content.
Factors affecting infiltration process a.
The chemical properties of the soil: Soil permeability is significantly positively correlated with soil organic matter, total N, total K, hydrolysis of N [5].
Soil chemical properties change the soil permeability mainly by influencing the growth of trees.

Analysis of Parameters Sensitivity to Mechanical Properties of Large Section Tunnel in Soil Sheng LIU1,a, Tong LIU 2,b, , Bangzhe LIU2, Zichao DONG2 1School of Science, Chang’an University,Xi’an,710064,P.R.China 2School of Science, Xi’an University of architecture and Technology,Xi’an,710055,P.R.China a86128875@163.com b87596240@163.com Key words: Tunnel in soil; Sensitivity Analysis; FEM; Orthogonal numerical test Abstract: In order to analyze the mechanical properties parameters sensitivity of large section soil tunnel, this paper designs numerical test program of the degree of influence on mechanical properties by the change of physical and mechanical quantities based on the orthogonal experiment design.
In this paper, some treatment combination with strong representativeness chosen through orthogonal table is test to analyze the main factors of mechanical properties of large section tunnel.
The factors making an impact on numerical test observation indexes are known as test factors, and select the wall rock elastic modulus E, Poisson's ratio μ, cohesion С, internal friction angle φ as test factors.
Assuming factors are independent of each other by not taking the potential interaction between various factors into account.
Ap /m2 S1 /MPa Sy /MPa 1 14.92 2.74 10.37 2 5.61 2.35 12.48 3 2.42 2.57 11.15 4 3.35 1.89 11.91 5 1.81 2.67 10.83 6 8.37 1.81 9.78 7 0.15 1.56 10.57 8 7.46 1.72 9.72 9 3.67 1.68 8.75 Physical and mechanical parameters of wall rock are the internal factors affecting the stability of tunnel cavern.

Comparative Analysis of Printability, Optical, and Mechanical Properties of Coated Papers: A Case Study of Magno Satin and Art Carton Paper Gema Sukmawati Suryadi1,a*, Yessy Yerta Situngkir1,b, Meisi Riana1,c, Meuthia Suryani1,d and Sinta Fauziah1,e 1Graphic Engineering Study Program, Politeknik Negeri Media Kreatif, Indonesia a*gema@polimedia.ac.id, byessyyerta@polimedia.ac.id, cmeisi_riana@polimedia.ac.id, dicutdirham@yahoo.co.id, eefauziahsinta538@gmail.com Keywords: Optical Properties, Mechanical Properties, Printability, Coated Paper Abstract.
This study compares the printability, optical, and mechanical properties of two types of coated papers: Magno Satin (MS) and Art Carton (AC).
The physical, mechanical, and optical properties of paper are influenced by various factors, including the raw materials, pulping processes, and the application of coatings[3].
Tearing Properties of Samples Samples Tear Strength [mN] Tearing Factor [mN.m2/g] Magno Satin 646.97 2.30 Art Carton 1441.6 4.58 The tearing factor of AC (4.58 mN·m²/g) is also notably higher than that of MS (2.30 mN·m²/g).
Conclusion The study compares the printability, optical, and mechanical properties of Magno Satin (MS) and Art Carton (AC) papers.

Polymeric materials are the most useful damping material, but they cannot be used alone for high damping structural fields due to their limited properties such as poor mechanical properties, high shrinkage ratio and limited acclimatization.
As a way of investigating the effect of fly ash on dynamic mechanical properties, we have aimed at fly ash/polymer composites as the damping materials.
The dynamic moduli and loss factors, as well as their microstructure were investigated.
Dynamic Mechanical Properties.
Here, we can see that the dynamic mechanical properties of composites are affected by the operating temperature and FA particle sizes.

Key words: nonwovens; reinforced composites; mechanical properties; grey correlation; failure mechanism Abstract.
This text firstly tested the mechanical properties of composites which are composed by the reinforcement which is glass fiber nonwovens, glass fiber nonwoven felt or PE hot rolling nonwovens and unsaturated polyester resin matrix, and then used gray relative analysis method to analyze and make a comparison of mechanical properties.
Results and Discussions 2.1Experimental results Testing results of mechanical properties for the samples are shown in Table 2.
Table 2 Texting results of mechanical properties Mechanical properties Serial number 1 2 3 4 5 6 σt (Mpa) 110.65 2721.30 116.12 10.00 13.01 96.00 98.19 Et (MPa) 2927.14 3002.37 3110.29 633.53 652.27 εt (%) 1.361 1.521 0.378 0.445 2.453 2.545 Ex (Mpa) 3469.87 3650.63 3300.18 3482.22 732.24 742.62 σƒ (Mpa) 100.71 110.49 54.27 59.97 19.87 20.79 Eƒ (Mpa) 7976.41 8023.35 5000.11 5103.40 545.33 560.98 Vƒ (%) 8.54 8.96 5.98 6.35 7.23 7.71 2.2 Basic principle of gray relative analysis [9] The basic principle of gray relative analysis is seeking the internal links of some factors and identifying the factors that affect the target value by analyzing the data in gray relative system, so as to seize the key to solving the problem.
This text used the initialization method to analyze the mechanical properties of composites, and the results are shown in Table 3.

atanwyn@gmi.edu.my, bsafian@fkm.utm.my,cjaafar@kktmbp.edu.my Keywords: Rapid tooling; Epoxy; Injection mould; Mechanical properties; Fillers.
In this review, various filler types and several mechanical properties were compiled based on published literatures.
The performance characteristics that were evaluated include mechanical and physical properties as shown in Table 2.
This is dependent on type of fillers and adhesion between fillers and epoxy,which are the factors in improving tensile strength value [11].
Improving mechanical and thermal properties will produce better moulded parts in terms of dimensional stability and strength.

Mechanical properties of RAC was inferior to that of NAC, and treated RA by sulfuric acid solution could improve the mechanical properties.
Many studies [1～9] showed that, attached mortar is the most important factor affecting the properties of RA.
Furthermore, influence of defects on mechanical properties were evaluated.
Chinese Standard for test method of mechanical properties on ordinary concrete.
(3) Attached mortar had a huge influence on mechanical properties of RAC at a low W/B ratio, and gravel damage is a notable factor on mechanical properties of RAC at a high W/B ratio

Microstructure is an important factor that influences the mechanical properties of recycled aggregate concrete (RAC).
Recycled aggregate on the long term mechanical properties and pore system of RAC that were prepared with 100% substitution of natural coarse aggregates was assessed, at the same time, the effect of long-term (up to 5-years) water curing on the mechanical properties of the RAC was quantified[3].
Correlations between microstructure and mechanical properties are discussed.
The result verified that the relatively lower porisity of the recycled concrete benefit to development of mechanical properties.
Influence of recycled aggregates on long term mechanical properties and pore size distribution of concrete.

Influence of fiber’s surface state on mechanical properties and fiber-matrix interaction of CFRP J.
The mechanical properties were measured from the flexural test.
In the present work, for understanding how the carbon fiber’s surface state affects the mechanical properties and fiber-matrix interaction at CFRP, the carbon fiber’s surface functional groups was modified by thermal treatment at different temperatures.
In the current work, the main purpose is to know how the thermal treatment of fiber affecting the fiber-matrix bonding properties which control the fiber-matrix interaction.
Conclusion The influence of carbon fiber surface composition on the mechanical properties and fiber-matrix interaction of CFRP was investigated by means of XPS analysis, flexural test and microstructure analysis.

The results showed that the selected deacidification methods affect the surface-molecular and structural properties.
Moistening and speed capability of the porous material to absorb water vapour is affect by many factors.
The main factors influencing this process are temperature, pressure, and relative humidity of the environment.
In addition to the optical and mechanical properties, the chemical properties were measured.
The properties on hypermolecular level, i.e. microstructure and surface-molecular properties of the pore walls were compared with the chemical, mechanical and optical properties of these materials.