Search results

However, organic shell materials, while providing excellent sealing properties, often suffer from poor thermal conductivity, limited photothermal conversion efficiency, and insufficient mechanical strength[11-19].
The thermal storage and release properties of the microcapsules were characterized using a DSC 3+ differential scanning calorimeter under a nitrogen atmosphere.
The size of the microcapsules is influenced by factors such as HSMA volume, stirring rate, and reaction temperature.
Thermal properties of P, S0, S1, S2 and S3: (a) heating process, (b) cooling process, and (c) phase-change enthalpy.
[28] Huo J H, Peng Z G, Feng Q, Synthesis and properties of microencapsulated phase change material with a urea–formaldehyde resin shell and paraffin wax core, J.

Bubbles are modeled via scalar density fields describing the stochastic distribution of positions as well as fields of local properties such as the bubble diameter and phase velocities.
Specifically for Method of Moments-based simulations, Hlawitschka et al. [9] and Hummel et al. [10] proposed a visualization approach featuring sampling in addition to parametric bubble glyphs, which were shaped according to local flow properties.
For each affected cell, a number of samples according to Equation 3 is drawn.
Figure 3 (blue) shows the results for factors between 1 and 2048, using a logarithmic scale for both the integrated mean square error (vertical axis) and the volume factor (horizontal).
We now study how the kernel width affects the sampling quality when updating a bubble set.

Eight cracks on each prism affected the values of transfer lengths.
Using the analytical model [6], the evaluation of the radial and tangential stresses between wire and concrete considering Poisson’s effect, thickness of the edge distance and the mechanical properties of the materials was done.
Conclusions Based on the results of this study the important parameter affecting longitudinal splitting/cracking is the wire indent geometry.
- The second important parameter affecting longitudinal splitting/cracking is the type of concrete mixture used in prefabricating prestressing prisms.
There were no observed cracks on the prisms having ¾ in edge distance - The theoretical analysis shows evaluation of the tangential stresses between wire and concrete, considering Poisson’s effect, the edge distance, and the mechanical properties of the material.

The impingement zone is characterized by large gradients which cause major changes in the local flow properties.
Just above a critical limit, which is dependent on materials properties and process conditions, deposition dominates.
The mechanical and the thermal calibration factors (F1 = 1.2, F2 = 0.3) were generated by correlating calculated critical velocities on the basis of materials properties with experimentally determined critical velocities.
Since particle velocity is the most important factor in determining quality and properties of coatings, modifications of operation parameters should contribute to improve the particle velocity.
Although common features that involves adiabatic shear instability (ASI) at interfaces of particle-particle and particle-substrate, individual case differs based on the thermo-chemical and thermo-mechanical properties of respective particle and substrate.

Chloride is the main factor of structure’s corrosion in the marine environment.
It has better microphase separation, better coating mechanical properties and better adhesion strength.
The above phenomenon may be the 40 ± 2μm coating affected by the state of concrete surface, did not form a continuous, complete, defect-free coating film.
References [1] Huang Weibo, Lu Ping, Dependence of Dynamic Mechanical Property and Morphology of Polyaspartic Esters Based Polyureas on Curing Temperature.

In this regard, one of the key factors is the surface activity of the components associated with the preliminary mechanical activation of the raw material to the optimal values of the specific surface area, which provides the maximum possible transition of internal energy of the entire system to surface energy [6-8].
Scientific publications [11-13] provide contradictory information about the influence of fine waste (for example, pulverized cement powders) on the structurally sensitive properties of cement stone.
It should be noted that this thermodynamic criterion for evaluating the surface properties of raw materials by the amount of surface activity (kS), which takes into account the ability of a highly developed material surface to spontaneous processes of compensation for excess surface energy, is numerically equal to the share of the total reserve of potential energy of the system converted to free surface energy during mechanical activation of raw materials [7].
Goncharov, Crystal energy as a basis for evaluating the magnesian properties of solid materials (including magnesian cements), Saint Petersburg, 2006
Pospelova, Criteria for evaluating energy properties of a surface, Nanosystems: physics, chemistry, mathematics. 2(4) (2011) 1-6

Introduction If we want to extend the life of any product, we must take care of it, maintain a maintenance plan, and avoid unnecessarily affecting the degradation.
Lithium silicate reacts with calcium hydroxide in the concrete to form a solid, insoluble calcium silicate structure that causes greater concrete density and greater resistance to mechanical grinding and therefore dustiness. [3] Materials and Methods The advantages of sealants are increased resistance to frost, reduced water infiltration and aggressive chemicals such as chlorides.
There is usually a lack of verification of laboratory results under site conditions and the quality of the concrete and the covering layer should not be reduced. [1] As noted above for comparing the properties of selected lithium silicate-based curing coatings, we have chosen the widely abrasive abrasion method according to Böhm to evaluate the measu red values ​​according to two standards.
This method may not be accurate because a human factor enters the measurement, where we may not always be able to measure a given thickness loss at the same location, so there are much greater differences.

Specifically, the elastic follow-up factor is the ratio of plastic strain to the corresponding elastic strain reduction.
This affected both the overall length of the specimen and gripping arrangements, and the maximum cross-sectional area to allow sufficient stress to be applied.
The as-received material had the following material properties: Young's modulus, 72 GPa; Poisson's ratio 0.33; and yield stress, 145 MPa... 150 mm . 3 mm . 100 mm . 22 mm .
This reduction, although in the order of 30 MPa, is over a sufficiently small area not to affect the macro-scale response.
The elastic follow-up factor is approximately 2 before net section yielding occurred.

The thermal property was studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA).
Thermal properties of PA12T.
DMA was also used to characterize the thermal property of PA12T (Fig. 6).
The crystallization process affects polymer properties through the crystal structure and morphology established during the molding process.
In order to obtain materials with better physical properties, it is important to study the isothermal and non-isothermal crystallization processes[19].

Varying the extrusion ratio along tube direction affects the product velocity as well as the profile exit temperature und thus the microstructure in different tube sections.
This is due to its attractive properties like low specific weight but good mechanical properties, excellent manufacturing and forming properties and good corrosion resistance [1].
Since the profile exit temperature is an important factor determining the profile microstructure and both sections exit the die with similar Tp, the difference in grain size is not significant.
Reimers, Extrusion of aluminum tubes with axially graded wall thickness and mechanical chracterization, Procedia CIRP Vol. 18, (2014), pp. 3-8 [6] M.