Search results

The effects of mechanical damage on nutritional compositions of fresh-cut potatoes into half averagely have been investigated.
In general, fresh-cut products have a shorter shelf-life, which is mainly due to mechanical stresses [2].
The physiological effects of wounding are important factors in determining quality and shelf life of most fresh-cut fruit and vegetable products.
While the inner layer fresh cells’ respiration increased the exhaustion of itself affected by the cutting wound.
These secondary reactions may bring about changes in physical, chemical and nutritional characteristics and may also affect the sensory properties of fruits and vegetables.

In the case does not affect the construction, these parameters are not easily measured through the on-site test methods, it is also impossible to get through laboratory test methods.
Get the scope of rock mechanical parameters through laboratory test or on-site test, use orthogonal design experimentation[5] to get the complete input data, calculate in FLAC3D to get the output data, factors of each column on each level appears the same times in the orthogonal table, avoid all obstacles as possible, it ensure the neat comparability.
The release of tunnel rock displacement is affected by many factors, take a comprehensive analysis on these factors is important for solving the release rate of tunnel rock stress by establishing calculate model, the major factors which affect the release rate are: the rock quality, the original stress, the project factors, time, and space.[6] In order to simplify the calculation, select the following parameters as input parameters establishment of sample space with FLAC3D: horizontal pressure coefficient , deformation-modulus , friction , cohesion , release rate of stress , where the contains two data and .
All of these factors divide to 5 levels with orthogonal table L25(56).
In order to test the prediction accuracy of network, we construct test samples with uniform design method (choose uniform table U10(108), select 5 properties according to the user guide of the table), then calculate the expected output with FLAC3D model, get the predicted output by the network, and compared it with the expected output.

Possibilities of Using Concrete and Brick Recyclate as a Substitute for Natural Aggregates Rudolf Hela1,a, Křížová Klára2,b* 1,2Brno University of Technology, Faculty of Civil Engineering, Veveri 331/95, 620 00 Brno, Czech Republic ahela.r@fce.vutbr.cz, bkrizova.k@fce.vutbr.cz Keywords: Concrete; Brick; Recycled aggregate; Mechanical properties; Environmental influence Abstract.
The results of physico-mechanical properties of different formulations experimentally and practically verified will be shown and the areas of their safe use will be discussed.
Properties of concrete with recyclate
Results of density and compressive strength after 7 and 28 days Concrete Hardened density [kg/m3] Compressive strength [MPa] 7 days 28 days 7 days 28 days C 16/20 NA 2320 2300 28.3 32.3 C 16/20 RCA 2230 2200 23.8 26.9 C 30/37 NA 2340 2330 35.9 46.4 C 30/37 RCA 2290 2280 30.1 39.2 Conclusion Concrete recycled aggregate has reduced properties compared to natural aggregate, therefore the properties of the concrete made from it are greatly affected.
Another factor is the different bulk density, which is always lower for recycled aggregate than for natural aggregate.

Thus, a balance between process and properties or cost is essential in order to achieve widespread use of AM technologies in industry.
This paper focuses on investigating and comparing the mechanical properties and behavior, as well as manufacturability and costs based on part complexity for 316L stainless steel fabricated via AM versus conventionally fabricated (CNC) samples of 316L stainless steel.
The lower hardness in the case of the heat-treated samples is normal behavior resulting the softer ductile material properties.
The tensile properties of CNC machined samples were better to those of AM.
Factors such as mechanical performance cost and part complexity play a big role in deciding on a most sustainable manufacturing approach in terms of production.

Its’ quality of parts surface will directly affect the life and strength of mechanical parts.
Therefore, the quality of parts surface in grinding is particularly important to mechanical parts.
With various grinding factors taken into account, we could advance mathematical simulation using MATLAB accord to the triangle or the bands cutting model.
Such as the micro structure properties of 45# structural steel, what kind of temperature can lead to change of organization of austenite?
So that we can overcome the limitations of traditional methods of simulation, subsequently we should deeply study of grinding which can affect temperature field factors in the grinding process.

Vegetal fibers, due to their renewable aspect and their mechanical properties are important candidates to achieve excellence in the use of geotextiles.
The degradation effect is analyzed based on the mechanical behaviour of each fiber type after exposition to the degradation factors.
Moreover, the fibers have been subjected to natural degradation factors and to lab aging agents, using a QUV equipment.
Some of the properties of these fibers are shown in Table 1.
Indutrial Applications of Natural Fibres: Structure, Properties and Technical Applications, John Wiley & Sons, Ltd, 2010, pp. 10–48.

The torque performance of the SB-VAWT is greatly affected by the blade airfoil.
In this study, bend which is one of the most important factors which affects the starting characteristics of the SB-VAWT was researched by numerical computations in a CFD package based on the 2 dimensions incompressible steady flow.
It can be inferred that the mechanical properties of wind turbine become more stable with the increasing of curvature of blade.
The mechanical properties of wind turbine become more stable with the curvature of blade airfoils increasing.

Analysis of the statusquo CNC lathe machining, influenced by the traditional ordinary lathe, in the review of existing machining dimension, dimension dispersion, groove size discrepancies exist, machining parts contour elements incomplete phenomenon, these phenomena cause problems in numerical control machining size need to be retranslated, multiple tool change, thus affecting the preparation procedures and processing program of NC machining process, influence of NC turning machining quality and efficiency.
Because under normal circumstances, parts of the annotation in the design size, mainly consider the part design and assembly and other factors, often using partial dispersion dimension marking method, as shown in Figure 2a) dimension shown partial dispersion method for labeling, and such dimensioning methods will give processing arrangement of follow-up and NC programming inconvenience, programming needs of conversion parts size, that is not conducive to simplify the determination of the origin of NC program is not conducive to the NC program.
Analysis of parts provided by the blank material mechanical properties and heat treatment, casting quality and machined parts blank material hardness, whether there is a white, sand, porosity, the degree of difficulty to judge its processing, so as to provide basis for the selection of tool materials and cutting amount.
Because the program origin is the start point and end point coordinate NC programming, the difficult easy degree so the right choice it directly affects the machining accuracy and the coordinates of the points computed part, in the choice of programming origin should try to make the design datum and technology base program origin and pattern on the weight, in order to reduce the standard error is not coincidence, and program origin selection should also make the programming size computation is simple, the machining error caused by the factors should be minimum, measuring position is more convenient etc..
Mechanical research and application.2002.9 [2] Maofa Hua.

Especially the influence on the bonding conditions and the mechanical properties of the joints has been investigated.
It was shown that intermetallic phases, in particular Fe2Al5, may have a positive effect on the mechanical properties of the joint.
One main result of their investigations was the existence of a thin layer of an intermetallic phase in small regions, which seemed to have a positive influence on the mechanical properties of the joints.
[5] Venkateswaran, P.; Reynolds, A.: Factors affecting the properties of Friction Stir Welds between aluminum and magnesium alloys, Materials Science and Engineering: A, 2012, 545, pp. 26–37
[18] Lienert, T., 2007: Microstructure and Mechanical Properties of Friction Stir Welded Titanium Alloys.

They still study the stress and deformation properties of pile-raft-subsoil under the ultimate load by designing a series of model test about single pile caps and group pile raft foundation pile.
Pile foundation model experiment Many scholars study the load transfer characteristics and the bearing deformation characteristics of the pile through the way of loading, the density of soil, the surface roughness of pile, grouting and other factors to with indoor model test.
Conclusion Field test is the most effective way to study the pile foundation, but because of the disadvantages such as test inputs, long cycle and interference factors, the indoor test become the commonly used method to reveal the working properties of the prototype pile.
However, there are many interference factors, such as large investment, long cycle, difficult in setting test instrument, and no repetitive interference.
The pile raft foundation under the ultimate load combination properties for indoor model test research [J].