Search results

Reactive Power Optimization Analysis of 35KV Regional Power Grid Based On The Genetic Algorithm Pei Huang Mechanical and Electrical Engineering Institute of Jiangsu JianZhu Institute, Xuzhou, Jiangsu, China Keywords: Reactive power optimization, Genetic algorithm, Power system, Maximum operational mode.
The genetic algorithm is applied to settling the problems with the characteristics of multi variables, multi constraints, nonlinear and discontinuous properties, which is discussed in this paper.
Model of reactive optimization Basically, under the condition that the active flow schedule is confirmed in the power grid, the capacity of reactive compensation equipments affects the objective function (1) (1) H is the number of nodes, and are the voltage value of node i and node j.
Besides the capacity of reactive compensation equipments , the factors affecting the objective function includes the grid level and the application of on-load voltage regulation0.

The purpose of this study is to assess the contribution of metal fibers on the mechanical properties of sand concrete designed with local materials.
The fresh properties but also in the hardened state are presented.
Its properties are shown in Table 3 (data manufacturer).
However, this addition does not affect the rheology of fresh concrete characterized by the slump cone.
JOHNSTON, Steel fiber reinforced and plain concrete factors influencing flexural strength measurement, A.C.I.

The strength of honeycomb structures along with resistance to service temperature and cost are the most essential factors in selection of brazing alloy.
One of the problems associated with the use of these alloys, is the formation of brittle phases within the joint area which affects the joints properties [5, 6].
The objective of the present investigation was to study the microstructure and mechanical properties of the brazed joints using BNi-2 filler metal.
These brittle phases reduce mechanical properties since crack initiation can occur in these locations.
J.,1998 , 77, No. 2, pp. 66s 75s. 5- Okuto K, Namba K, Mizukoshi H, Hiyama Y," The analysis and design of honeycomb welded structures",Light Met Welding,. 1991,pp.569-985. 6- Rabinkin A,"Overview: Brazing with (NiCoCr)-B-Si amorphous brazing FMs: Alloys, processing, joint structure, properties, applications", Sci.

Conductive Polymer Composites from Polylactic Acid / Natural Rubber Filled with Carbon Black Yose Fachmi Buys1,a, Nor Afiza Syafina Lokman1,b 1Department of Manufacturing and Materials, International Islamic University Malaysia, Jalan Gombak 53100, Kuala Lumpur, Malaysia ayose@iium.edu.my, bafizasyafina@gmail.com Keywords: Conductive Polymer Composites, Polylactic Acid, Natural Rubber, Carbon Black, Electrical properties Abstract: In order to develop environmentally friendly conductive polymer composites, polylactic acid (PLA) was melt blended with natural rubber (NR), with addition of carbon black (CB) as the conductive filler.
This research aims to fabricate CPC from biodegradable PLA matrix based with improved toughness property.
Dynamic Mechanical Analysis (DMA) Measurement.
Information on morphology of matrix consist of polymer blend is a matter of importance in determining the dispersion states of CB, which in turn will affect the electrical properties of CPC.
The continuity of CB network as well as continuity of the phase with rich filler content are important factors that lead to high electrical conductivity [7].

Therefore, a large number of factors affect the yard plan, they are not only complex, but also random.
First, determine the allocation of export container yard and property factors.
Interaction between the factors and attributes do also exist.
Table 1 The relationship between factors and attributes of the process of exportation container yard allocation Step 2: Determine the relationship between different factors of exportation container yard allocation, and the factors are same as these in the first step.
Classify the relationship between the various factors, then put them into the following triangular table as Figure 2.

Designed line tower positions are higher than maximum flood level of surface rivers in the area, the towers are less affected by surface rivers.
There is no large surface water body but some seasonal creeks in the area which is recharged mainly by atmospheric precipitation and largely affected by climates.
Based on mechanical properties of rocks, lithology and composition relationships, rock strata in the survey area can be classified into soft and loose engineering geology rocks.
Coal mining has a long history in the area where small coal mines and old caves ate distributed complexly to largely affect tower base of ground lines.
(3) Old goafs affect towers outside the goaf influence range.

So, to use these opposite air movements usually the Wells turbine is employed, which has the property of maintaining the rotation direction irrespective of the flow direction.
Moreover, under-relaxation factors of 0.3 and 0.7 are imposed for the conservation equations of continuity and momentum, respectively.
To do so, the Root Mean Square (RSM) statistical technique which is indicated for varying quantities was adopted, being given by [26]: (11) In Fig. 5(a) it is possible to observe how the amplification factor is affected by the variation of the height of the incident waves, while in Fig. 5(b) it is showed the influence suffered by the available hydropneumatic power of the OWC in virtue of the different heights of simulated waves.
Thesis in Mechanical Engineering, University Nova de Lisboa, Lisboa, 2011
Thesis in Mechanical Engineering, University Nova de Lisboa, Lisboa, 2009

Based on the above considerations, under different axial compression ratios, the mechanical properties of the construction joints of the frame columns with construction joints and the cast-in-situ frame columns were studied by low cycle repeated load tests and analyzed the influence of the second-order effect on the shear capacity of frame columns with joints.
At the same time, the change of the axial compression ratio will also make the additional load effect affect the shear-bearing capacity of the component.
In China, the second-order effect of reinforced concrete columns has been studied to some extent[2-4]; Han Fengxia has analyzed the second-order dynamic effect of reinforced concrete slender columns, and determined the main factors affecting the second-order dynamic effect and the mutual influence of the two effects[5]; Li Chushu[6] has pointed out that when there is a large stress in the structure, even if the deformation is very small, it is necessary to re-establish the balance equation after the deformation to get the accurate internal force and displacement of the structure.
Therefore, the change of axial compression ratio affects the shear-bearing capacity of columns with joints.
Mechanical properties of construction joint and influence on seismic behavior of RC column[J].

Introduction One of the non-destructive methods of controlling of material properties is acoustic emission [1-14], which manifests itself during macro-, micro- and nanoscale rearrangement of the structure of elements.
Fractogram of micro-damage of weld metal at different moments of time The model of a stream of signals of AE in the form of dependence on time of t of number of Nå of impulses of AE of materials has the following general view: Nåt=V∆t, f, uФ∆t, f, ududfd∆t×C0ω0ω0+∆ωψω1--exp-0tdt'θU0,ωt'dω, (1) where each of the parameters included in (1) is presented in Table 1, has a certain physical nature and depends on various factors affecting the control suitability of destruction and strength properties of the material.
Makhmudov, A Study of the Acoustic Properties of a Body of Heterogeneous Rocks and Concrete Lining under Natural Conditions, Technical Physics 65 (2020) 133–138
[20] Shuncai Li, Qiu Yu, Jingjing Pu, Fei Chen, Study on mechanical properties and acoustic emission characteristics of metallic materials under the action of combined tension and torsion, Engineering Fracture Mechanics 200 (2018) 451-464
Mechanical engineering industry 19(1) (2019) 5-14

Table 1 summarize the thermo-mechanical properties of the utilized alloys.
Materials thermo-mechanical properties Properties AA6016-T6 AZ31 Density 2.7 g/cm3 1.77 g/cm3 Poisson’s ration 0.33 0.35 Elastic modulus 69 GPa 45 GPa Tensile strength 250 MPa 290 MPa Yield strength 120 MPa 220 MPa Elongation 17 % 15 % Hardness 159 HV 138 HV Thermal conductivity 167 W/m°K 96 W/m°K Thermal capacity 0.89 J/Kg°C 1 J/g°C Results and discussion Experiments were conducted with the same materials and process parameters used for the simulations.
In turn, for the poor joint, the bonding line is a curve starting from the RS, close to the bottom of the joint, and ending in the AS close to the joint top surface. this is due to the different thermo-mechanical properties of the two materials.
It is worth noticing that the compression conditions obtained because of the material flow indicted by the tool are, together with the needed temperature conditions, the key factors for effective solid bonding to occur.
Jahazi, Microstructure and tensile properties of friction stir welded AZ31B magnesium alloy, Mater.