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A study conducted by [ 2 ] indicated that the type of mower used can affect turfgrass quality.
Cutting and grass cutting has many variables that have an impact on crushing and some of the important variables are the cutting speed and the percentage of moisture from the vine, and there is a need to establish a model of cutting mechanics and to relate knife parameters to forage material properties [ 3-6 ].
Chattopadhyay and Pandey [ 9 ] stated that flail-type cutting devices require a minimum knife speed for effective cutting.There are requirements for additional cutting mechanics and for further studies of the cutting action of knives and therefore there is a need to create a model of cutting mechanics and to relate knife parameters to forage material properties [ 10 , 11 ].
Table 1 Analysis of variance (ANOVA) Source of variation (S.O.V) Degree of freedom (d.f) Percentage of sweet potato vine passing through the sieve (< 28 mm2) % Duplicates Shapes of knife (Sh) Cutting speed (s) Interaction between (Sh × s) Experimental error Total 2 1 2 2 10 17 156.10042** 553.94708** 8.6191416* 1.3081338 L.S.D 1 %=2.58118 L.S.D 5 %=1.69215 **significant at level 1 %, *significant at level 5 %, Table 2 Factors influencing the percentage of sweet potato vine passing through the sieve (< 28 mm2)% Sh/s s1 1830 [rpm] s2 2066 [rpm] s3 2440 [rpm] Mean-Sh L-shaped (Sh1) Y-shaped (Sh2) Mean-s 67.52 76.16 71.84 74.74 79.49 77.12 88.34 92.62 90.48 76.87 82.76 Sh = shapes of the knife, s = speed of the mower (rpm).
Sulaiman, "Design and development of an integrated slasher (pulverizer) for sweet potato harvester: A Review " in 1st International Conference in Mechanical Engineering Research (ICMER 2011), 2011

Introduction Tensile strength is one of the important mechanical properties of concrete, most of the time people use the method of splitting for the tensile strength of concrete In the reinforced concrete engineering, because axial tensile test is difficult, contrast, splitting tensile test is simple.
The experimental study on tensile property of high performance concrete at early stage[J].
Experimental Technology and Management, 2003, 20(2) [3] GB/T 50081-2002, Standard for Test Method of Mechanical Properties of Ordinary Concrete[s]
Experimental Sudy of Early Age Concrete Mechanical Properties[D].
A Study of Concrete Early Mechanical Properties[J].

A methodology for discrete simulation has been developed that incorporates many structural characteristics of polycrystalline material properties, such as: texture, grain boundaries, microstructure, phase composition, chemical composition, stored energy, and residual stresses.
The proposed model can help researchers and engineers to understand the physical mechanism of oxidation in order to predict material behavior and optimize material processing and properties.
The oxide film formed on the pressure tube surface is a good protective barrier against further oxidation and hydrogen ingress, both of which have a deleterious influence on the mechanical properties of the Zr-2.5% Nb alloy.
The oxidation process and hydrogen ingress are inward diffusion processes that are significantly affected by the oxide texture and microstructure.
The formation of oxide texture and microstructure is affected by many factors that are different from metal to metal.

Since strength is often the predominant factor in the application of HSLA steels, the filler metal is often selected on the basis of matching the strength of the base metal.
The cold cracking, sometimes called as hydrogen cracking, occurs when the following four factors are present simultaneously: hydrogen in the weld metal, high stresses, susceptible microstructure (martensite), and relatively low temperature (between -100 and 200°C).
Another important parameter affecting the results of welded joints is distance between the arc and the forward roller.
So the proper distance between arc and roller should make the distance is short enough to keep the steel under the forward as austenite, this is because the austenite has better plastic property, lower yield strength and better toughness than the martensite.
Factors Controlling Cold Crack Susceptibility of Weld Metal.

Accordingly, the excellent properties of AC made from palm shell made it a considerable candidate for electrode material for Supercapacitor application.
Various factors such as activation agent, activation time, activation temperature, particle size, activation method, and nature of starting material affects the performance of activated carbon as electrode material of EDLC.
Table 1 present the properties of activated carbon associated to their specific application.
Desirable factors of activated carbon for specific application [10] Application Properties Water treatment · Large surface area, Fast adsorption rate, Wide and stable micropores Gas/pollutant adsorption · Specific gas compatibility, large surface area, high reactivity with target gas/pollutant.
The dry PKS was grinded with a mechanized granulator at the mechanical engineering workstation into 5mm particle size.

Huang and Tai [5] studied factors affecting the warp of thin-shell injection parts using C-Mold and the Taguchi Method.
The location, number, shape, and size of the gate directly affect the appearance, size precision, properties, and molding efficiency of the product.
Without affecting the performance of products and molding efficiency, the length, width, and height of the gate were shortened.
Table 4 shows physical properties of ARTON F5023 plastic.
Measurement was taken when its properties became stable.

Firstly, a program was developed in finite element model to simulate actual mechanical behavior of vehicle at urban intersection, based on dynamic features of variable speed moving vehicle loads.
Uniform moving: The speed of uniform moving will be affected by the following factors: length of every load l, load time t0, thus the final speed can be expressed by:
(4) Material Properties The material parameters used in the simulation are shown in Table 1, which are common for many dense graded HMA in China.
Material properties used in finite element simulations Properties Upper asphalt layer Middle asphalt layer Lower asphalt layer Upper base layer Lower base layer Subgrade Material SMA-16 AC-25 AC-30 LFAS soil-lime e - Thickness[m] 0.04 0.05 0.07 0.38 0.36 5 Elastic modulus[Mpa] 1200 1100 1000 1200 400 40 Poisson’s ratio 0.35 0.35 0.35 0.3 0.35 0.4 Solid bulk density [kg/m3] 2500 2500 2500 2100 1900 1900 damping coefficient β 0.05 0.05 0.05 0.05 0.05 0.05 Mechanics Responses Analysis Distribution of vertical displacement (a) Accelerating (b) Decelerating (c) Uniform moving (d) Time history Fig.2 Distribution of vertical displacement From the figures, it is shown that vertical displacement of pavement during starting and braking is larger than that under constant motion.
[4] X.D.Hu: Measurement of tire pressure distribution and mechanical response analysis of asphalt pavement, Tongji University (2003).

The grain size reduction in combination with higher dislocation density causes many unique physical and mechanical properties of ECAP-manufactured materials.
Up to now most investigations on UFG materials fabricated by ECAP have been mainly focused on the microstructure [3,4], thermal stability [5,6] and mechanical properties [7,8] while there were rare works on the corrosion behavior of ECAP processed (ECAPed) materials.
(a) (b) Fig.3 (a) Polarization curves of as-received and ECAPed AISI 304 austenitic SS in 5 wt. % H2SO4 and (b) Ecorr and Icorr with respect to ECAP pass times Analysis and discussion According to Ref. [10], the grain boundaries play a primary role in many properties of ultra-fined grain materials.
For SS, one of the principle factors affecting its corrosion resistance in aggressive solution is the structure and stability of the chromium oxide film [14].

The Research to Hydrocyclone Desander of Sand Removing Based on Crude Oil Ding Fenga, Xiaofei Chang, Xianyong Zhang, Shouyong Li, Chao Ruan, Yu Xie School of Mechanical Engineering, Yangtze University, Jingzhou, Hubei, 434023, China afengd@yangtzeu.edu.cn, fengd0861@yahoo.com Keywords: Hydrocyclone CFD modeling Offshore platform Crude oil Abstract.
Separation Performance of separation many factors, including fluid in the particle size, density and concentration, run-time capacity and inlet pressure and the separator structure.
In pace with rapid development of computer hardware and software technology recently, the use of computational fluid dynamics (CFD) flow properties of engineering technical analysis has become a development[1-9]. 2.
The three-axis cross-section of cyclone position 3.2 STATIC FIELD The pressure distribution of hydrocyclone desander has direct affect on the classification efficiency, pressure loss also affects the sizing of the feed pump power and energy consumption, but also determines the static pressure within the axial and radial material flow, so pressure distribution is also an important parameter of the hydrocyclone desander fluid flow.
REFERENCES [1] SU Fazhang; SHEN JIAN-Feng; HAN Wei; LI Rennian; LI Qifei; LI De-shun (College of Fluid Power and Control; Lanzhou Univ.of Tech.; Lanzhou 730050; China); Performance prediction and amending design of sediment separator for drip irrigation system[J], Journal of Lanzhou University of Technology,2008, 34 (6): 51-54 [2] DONG Yong; LI Wenying; WANG Huaifa(Taiyuan University of Technology; Taiyuan 030024; China); Numerical Simulation Study of Bi-phase Flow in the Solid-liquid Separation Cyclone , Colliery Mechanical & Electrical Technology, 2009(3): 21-23

The views of verification expressed, dam downstream slope stability against sliding safety factor is less than the minimum allowable value specification, so where there is a sliding downstream slope instability is possible For the downstream slope is instable, the proposed approach is using weathered material to pressure the slope.
Calculation uses the Swedish arc method ,to period of steady seepage, water landing slope stability. physical and mechanical properties of soil layers of dam used are shown in Table 1, the results in Table 2.
Table 2 The results of dam slope stability against sliding table From the results we know that the dam after the treatment in a variety of operating conditions, the downstream slope to calculate the minimum safety factor of stability against sliding slope is greater than allowed minimum safety factor , sliding stability meet the requirements.
Reinforcement ago After reinforcement Conclusions and recommendations By calculating the safety factor of the dam to meet regulatory requirements after the reinforcement value analysis, dam after treatment to achieve a stable requirement.
[2] Tian Hua Analysis factors that affect slope stability [J] Shanxi Water Resources, 2004 (6): 63 - 65